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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * IPv6 Address [auto]configuration
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
9 */
10
11/*
12 * Changes:
13 *
14 * Janos Farkas : delete timer on ifdown
15 * <chexum@bankinf.banki.hu>
16 * Andi Kleen : kill double kfree on module
17 * unload.
18 * Maciej W. Rozycki : FDDI support
19 * sekiya@USAGI : Don't send too many RS
20 * packets.
21 * yoshfuji@USAGI : Fixed interval between DAD
22 * packets.
23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
24 * address validation timer.
25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
26 * support.
27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
28 * address on a same interface.
29 * YOSHIFUJI Hideaki @USAGI : ARCnet support
30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
31 * seq_file.
32 * YOSHIFUJI Hideaki @USAGI : improved source address
33 * selection; consider scope,
34 * status etc.
35 */
36
37#define pr_fmt(fmt) "IPv6: " fmt
38
39#include <linux/errno.h>
40#include <linux/types.h>
41#include <linux/kernel.h>
42#include <linux/sched/signal.h>
43#include <linux/socket.h>
44#include <linux/sockios.h>
45#include <linux/net.h>
46#include <linux/inet.h>
47#include <linux/in6.h>
48#include <linux/netdevice.h>
49#include <linux/if_addr.h>
50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
56#include <linux/slab.h>
57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
60#include <linux/capability.h>
61#include <linux/delay.h>
62#include <linux/notifier.h>
63#include <linux/string.h>
64#include <linux/hash.h>
65
66#include <net/ip_tunnels.h>
67#include <net/net_namespace.h>
68#include <net/sock.h>
69#include <net/snmp.h>
70
71#include <net/6lowpan.h>
72#include <net/firewire.h>
73#include <net/ipv6.h>
74#include <net/protocol.h>
75#include <net/ndisc.h>
76#include <net/ip6_route.h>
77#include <net/addrconf.h>
78#include <net/tcp.h>
79#include <net/ip.h>
80#include <net/netlink.h>
81#include <net/pkt_sched.h>
82#include <net/l3mdev.h>
83#include <linux/if_tunnel.h>
84#include <linux/rtnetlink.h>
85#include <linux/netconf.h>
86#include <linux/random.h>
87#include <linux/uaccess.h>
88#include <linux/unaligned.h>
89
90#include <linux/proc_fs.h>
91#include <linux/seq_file.h>
92#include <linux/export.h>
93#include <linux/ioam6.h>
94
95#define IPV6_MAX_STRLEN \
96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
97
98static inline u32 cstamp_delta(unsigned long cstamp)
99{
100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
101}
102
103static inline s32 rfc3315_s14_backoff_init(s32 irt)
104{
105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
106 u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt;
107 do_div(tmp, 1000000);
108 return (s32)tmp;
109}
110
111static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
112{
113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
114 u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt;
115 do_div(tmp, 1000000);
116 if ((s32)tmp > mrt) {
117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
118 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt;
119 do_div(tmp, 1000000);
120 }
121 return (s32)tmp;
122}
123
124#ifdef CONFIG_SYSCTL
125static int addrconf_sysctl_register(struct inet6_dev *idev);
126static void addrconf_sysctl_unregister(struct inet6_dev *idev);
127#else
128static inline int addrconf_sysctl_register(struct inet6_dev *idev)
129{
130 return 0;
131}
132
133static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
134{
135}
136#endif
137
138static void ipv6_gen_rnd_iid(struct in6_addr *addr);
139
140static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
141static int ipv6_count_addresses(const struct inet6_dev *idev);
142static int ipv6_generate_stable_address(struct in6_addr *addr,
143 u8 dad_count,
144 const struct inet6_dev *idev);
145
146#define IN6_ADDR_HSIZE_SHIFT 8
147#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
148
149static void addrconf_verify(struct net *net);
150static void addrconf_verify_rtnl(struct net *net);
151
152static struct workqueue_struct *addrconf_wq;
153
154static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
155static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
156
157static void addrconf_type_change(struct net_device *dev,
158 unsigned long event);
159static int addrconf_ifdown(struct net_device *dev, bool unregister);
160
161static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
162 int plen,
163 const struct net_device *dev,
164 u32 flags, u32 noflags,
165 bool no_gw);
166
167static void addrconf_dad_start(struct inet6_ifaddr *ifp);
168static void addrconf_dad_work(struct work_struct *w);
169static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
170 bool send_na);
171static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
172static void addrconf_rs_timer(struct timer_list *t);
173static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
174static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
175
176static void inet6_prefix_notify(int event, struct inet6_dev *idev,
177 struct prefix_info *pinfo);
178
179static struct ipv6_devconf ipv6_devconf __read_mostly = {
180 .forwarding = 0,
181 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
182 .mtu6 = IPV6_MIN_MTU,
183 .accept_ra = 1,
184 .accept_redirects = 1,
185 .autoconf = 1,
186 .force_mld_version = 0,
187 .mldv1_unsolicited_report_interval = 10 * HZ,
188 .mldv2_unsolicited_report_interval = HZ,
189 .dad_transmits = 1,
190 .rtr_solicits = MAX_RTR_SOLICITATIONS,
191 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
192 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
193 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
194 .use_tempaddr = 0,
195 .temp_valid_lft = TEMP_VALID_LIFETIME,
196 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
197 .regen_min_advance = REGEN_MIN_ADVANCE,
198 .regen_max_retry = REGEN_MAX_RETRY,
199 .max_desync_factor = MAX_DESYNC_FACTOR,
200 .max_addresses = IPV6_MAX_ADDRESSES,
201 .accept_ra_defrtr = 1,
202 .ra_defrtr_metric = IP6_RT_PRIO_USER,
203 .accept_ra_from_local = 0,
204 .accept_ra_min_hop_limit= 1,
205 .accept_ra_min_lft = 0,
206 .accept_ra_pinfo = 1,
207#ifdef CONFIG_IPV6_ROUTER_PREF
208 .accept_ra_rtr_pref = 1,
209 .rtr_probe_interval = 60 * HZ,
210#ifdef CONFIG_IPV6_ROUTE_INFO
211 .accept_ra_rt_info_min_plen = 0,
212 .accept_ra_rt_info_max_plen = 0,
213#endif
214#endif
215 .proxy_ndp = 0,
216 .accept_source_route = 0, /* we do not accept RH0 by default. */
217 .disable_ipv6 = 0,
218 .accept_dad = 0,
219 .suppress_frag_ndisc = 1,
220 .accept_ra_mtu = 1,
221 .stable_secret = {
222 .initialized = false,
223 },
224 .use_oif_addrs_only = 0,
225 .ignore_routes_with_linkdown = 0,
226 .keep_addr_on_down = 0,
227 .seg6_enabled = 0,
228#ifdef CONFIG_IPV6_SEG6_HMAC
229 .seg6_require_hmac = 0,
230#endif
231 .enhanced_dad = 1,
232 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
233 .disable_policy = 0,
234 .rpl_seg_enabled = 0,
235 .ioam6_enabled = 0,
236 .ioam6_id = IOAM6_DEFAULT_IF_ID,
237 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
238 .ndisc_evict_nocarrier = 1,
239 .ra_honor_pio_life = 0,
240 .ra_honor_pio_pflag = 0,
241};
242
243static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
244 .forwarding = 0,
245 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
246 .mtu6 = IPV6_MIN_MTU,
247 .accept_ra = 1,
248 .accept_redirects = 1,
249 .autoconf = 1,
250 .force_mld_version = 0,
251 .mldv1_unsolicited_report_interval = 10 * HZ,
252 .mldv2_unsolicited_report_interval = HZ,
253 .dad_transmits = 1,
254 .rtr_solicits = MAX_RTR_SOLICITATIONS,
255 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
256 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
257 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
258 .use_tempaddr = 0,
259 .temp_valid_lft = TEMP_VALID_LIFETIME,
260 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
261 .regen_min_advance = REGEN_MIN_ADVANCE,
262 .regen_max_retry = REGEN_MAX_RETRY,
263 .max_desync_factor = MAX_DESYNC_FACTOR,
264 .max_addresses = IPV6_MAX_ADDRESSES,
265 .accept_ra_defrtr = 1,
266 .ra_defrtr_metric = IP6_RT_PRIO_USER,
267 .accept_ra_from_local = 0,
268 .accept_ra_min_hop_limit= 1,
269 .accept_ra_min_lft = 0,
270 .accept_ra_pinfo = 1,
271#ifdef CONFIG_IPV6_ROUTER_PREF
272 .accept_ra_rtr_pref = 1,
273 .rtr_probe_interval = 60 * HZ,
274#ifdef CONFIG_IPV6_ROUTE_INFO
275 .accept_ra_rt_info_min_plen = 0,
276 .accept_ra_rt_info_max_plen = 0,
277#endif
278#endif
279 .proxy_ndp = 0,
280 .accept_source_route = 0, /* we do not accept RH0 by default. */
281 .disable_ipv6 = 0,
282 .accept_dad = 1,
283 .suppress_frag_ndisc = 1,
284 .accept_ra_mtu = 1,
285 .stable_secret = {
286 .initialized = false,
287 },
288 .use_oif_addrs_only = 0,
289 .ignore_routes_with_linkdown = 0,
290 .keep_addr_on_down = 0,
291 .seg6_enabled = 0,
292#ifdef CONFIG_IPV6_SEG6_HMAC
293 .seg6_require_hmac = 0,
294#endif
295 .enhanced_dad = 1,
296 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
297 .disable_policy = 0,
298 .rpl_seg_enabled = 0,
299 .ioam6_enabled = 0,
300 .ioam6_id = IOAM6_DEFAULT_IF_ID,
301 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
302 .ndisc_evict_nocarrier = 1,
303 .ra_honor_pio_life = 0,
304 .ra_honor_pio_pflag = 0,
305};
306
307/* Check if link is ready: is it up and is a valid qdisc available */
308static inline bool addrconf_link_ready(const struct net_device *dev)
309{
310 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
311}
312
313static void addrconf_del_rs_timer(struct inet6_dev *idev)
314{
315 if (del_timer(&idev->rs_timer))
316 __in6_dev_put(idev);
317}
318
319static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
320{
321 if (cancel_delayed_work(&ifp->dad_work))
322 __in6_ifa_put(ifp);
323}
324
325static void addrconf_mod_rs_timer(struct inet6_dev *idev,
326 unsigned long when)
327{
328 if (!mod_timer(&idev->rs_timer, jiffies + when))
329 in6_dev_hold(idev);
330}
331
332static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
333 unsigned long delay)
334{
335 in6_ifa_hold(ifp);
336 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
337 in6_ifa_put(ifp);
338}
339
340static int snmp6_alloc_dev(struct inet6_dev *idev)
341{
342 int i;
343
344 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT);
345 if (!idev->stats.ipv6)
346 goto err_ip;
347
348 for_each_possible_cpu(i) {
349 struct ipstats_mib *addrconf_stats;
350 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
351 u64_stats_init(&addrconf_stats->syncp);
352 }
353
354
355 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
356 GFP_KERNEL);
357 if (!idev->stats.icmpv6dev)
358 goto err_icmp;
359 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
360 GFP_KERNEL_ACCOUNT);
361 if (!idev->stats.icmpv6msgdev)
362 goto err_icmpmsg;
363
364 return 0;
365
366err_icmpmsg:
367 kfree(idev->stats.icmpv6dev);
368err_icmp:
369 free_percpu(idev->stats.ipv6);
370err_ip:
371 return -ENOMEM;
372}
373
374static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
375{
376 struct inet6_dev *ndev;
377 int err = -ENOMEM;
378
379 ASSERT_RTNL();
380
381 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev)
382 return ERR_PTR(-EINVAL);
383
384 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT);
385 if (!ndev)
386 return ERR_PTR(err);
387
388 rwlock_init(&ndev->lock);
389 ndev->dev = dev;
390 INIT_LIST_HEAD(&ndev->addr_list);
391 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
392 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
393
394 if (ndev->cnf.stable_secret.initialized)
395 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
396
397 ndev->cnf.mtu6 = dev->mtu;
398 ndev->ra_mtu = 0;
399 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
400 if (!ndev->nd_parms) {
401 kfree(ndev);
402 return ERR_PTR(err);
403 }
404 if (ndev->cnf.forwarding)
405 dev_disable_lro(dev);
406 /* We refer to the device */
407 netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL);
408
409 if (snmp6_alloc_dev(ndev) < 0) {
410 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
411 __func__);
412 neigh_parms_release(&nd_tbl, ndev->nd_parms);
413 netdev_put(dev, &ndev->dev_tracker);
414 kfree(ndev);
415 return ERR_PTR(err);
416 }
417
418 if (dev != blackhole_netdev) {
419 if (snmp6_register_dev(ndev) < 0) {
420 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
421 __func__, dev->name);
422 goto err_release;
423 }
424 }
425 /* One reference from device. */
426 refcount_set(&ndev->refcnt, 1);
427
428 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
429 ndev->cnf.accept_dad = -1;
430
431#if IS_ENABLED(CONFIG_IPV6_SIT)
432 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
433 pr_info("%s: Disabled Multicast RS\n", dev->name);
434 ndev->cnf.rtr_solicits = 0;
435 }
436#endif
437
438 INIT_LIST_HEAD(&ndev->tempaddr_list);
439 ndev->desync_factor = U32_MAX;
440 if ((dev->flags&IFF_LOOPBACK) ||
441 dev->type == ARPHRD_TUNNEL ||
442 dev->type == ARPHRD_TUNNEL6 ||
443 dev->type == ARPHRD_SIT ||
444 dev->type == ARPHRD_NONE) {
445 ndev->cnf.use_tempaddr = -1;
446 }
447
448 ndev->token = in6addr_any;
449
450 if (netif_running(dev) && addrconf_link_ready(dev))
451 ndev->if_flags |= IF_READY;
452
453 ipv6_mc_init_dev(ndev);
454 ndev->tstamp = jiffies;
455 if (dev != blackhole_netdev) {
456 err = addrconf_sysctl_register(ndev);
457 if (err) {
458 ipv6_mc_destroy_dev(ndev);
459 snmp6_unregister_dev(ndev);
460 goto err_release;
461 }
462 }
463 /* protected by rtnl_lock */
464 rcu_assign_pointer(dev->ip6_ptr, ndev);
465
466 if (dev != blackhole_netdev) {
467 /* Join interface-local all-node multicast group */
468 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
469
470 /* Join all-node multicast group */
471 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
472
473 /* Join all-router multicast group if forwarding is set */
474 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
475 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
476 }
477 return ndev;
478
479err_release:
480 neigh_parms_release(&nd_tbl, ndev->nd_parms);
481 ndev->dead = 1;
482 in6_dev_finish_destroy(ndev);
483 return ERR_PTR(err);
484}
485
486static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
487{
488 struct inet6_dev *idev;
489
490 ASSERT_RTNL();
491
492 idev = __in6_dev_get(dev);
493 if (!idev) {
494 idev = ipv6_add_dev(dev);
495 if (IS_ERR(idev))
496 return idev;
497 }
498
499 if (dev->flags&IFF_UP)
500 ipv6_mc_up(idev);
501 return idev;
502}
503
504static int inet6_netconf_msgsize_devconf(int type)
505{
506 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
507 + nla_total_size(4); /* NETCONFA_IFINDEX */
508 bool all = false;
509
510 if (type == NETCONFA_ALL)
511 all = true;
512
513 if (all || type == NETCONFA_FORWARDING)
514 size += nla_total_size(4);
515#ifdef CONFIG_IPV6_MROUTE
516 if (all || type == NETCONFA_MC_FORWARDING)
517 size += nla_total_size(4);
518#endif
519 if (all || type == NETCONFA_PROXY_NEIGH)
520 size += nla_total_size(4);
521
522 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
523 size += nla_total_size(4);
524
525 return size;
526}
527
528static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
529 struct ipv6_devconf *devconf, u32 portid,
530 u32 seq, int event, unsigned int flags,
531 int type)
532{
533 struct nlmsghdr *nlh;
534 struct netconfmsg *ncm;
535 bool all = false;
536
537 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
538 flags);
539 if (!nlh)
540 return -EMSGSIZE;
541
542 if (type == NETCONFA_ALL)
543 all = true;
544
545 ncm = nlmsg_data(nlh);
546 ncm->ncm_family = AF_INET6;
547
548 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
549 goto nla_put_failure;
550
551 if (!devconf)
552 goto out;
553
554 if ((all || type == NETCONFA_FORWARDING) &&
555 nla_put_s32(skb, NETCONFA_FORWARDING,
556 READ_ONCE(devconf->forwarding)) < 0)
557 goto nla_put_failure;
558#ifdef CONFIG_IPV6_MROUTE
559 if ((all || type == NETCONFA_MC_FORWARDING) &&
560 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
561 atomic_read(&devconf->mc_forwarding)) < 0)
562 goto nla_put_failure;
563#endif
564 if ((all || type == NETCONFA_PROXY_NEIGH) &&
565 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
566 READ_ONCE(devconf->proxy_ndp)) < 0)
567 goto nla_put_failure;
568
569 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
570 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
571 READ_ONCE(devconf->ignore_routes_with_linkdown)) < 0)
572 goto nla_put_failure;
573
574out:
575 nlmsg_end(skb, nlh);
576 return 0;
577
578nla_put_failure:
579 nlmsg_cancel(skb, nlh);
580 return -EMSGSIZE;
581}
582
583void inet6_netconf_notify_devconf(struct net *net, int event, int type,
584 int ifindex, struct ipv6_devconf *devconf)
585{
586 struct sk_buff *skb;
587 int err = -ENOBUFS;
588
589 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
590 if (!skb)
591 goto errout;
592
593 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
594 event, 0, type);
595 if (err < 0) {
596 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
597 WARN_ON(err == -EMSGSIZE);
598 kfree_skb(skb);
599 goto errout;
600 }
601 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
602 return;
603errout:
604 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
605}
606
607static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
608 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
609 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
610 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
611 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
612};
613
614static int inet6_netconf_valid_get_req(struct sk_buff *skb,
615 const struct nlmsghdr *nlh,
616 struct nlattr **tb,
617 struct netlink_ext_ack *extack)
618{
619 int i, err;
620
621 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
622 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
623 return -EINVAL;
624 }
625
626 if (!netlink_strict_get_check(skb))
627 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
628 tb, NETCONFA_MAX,
629 devconf_ipv6_policy, extack);
630
631 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
632 tb, NETCONFA_MAX,
633 devconf_ipv6_policy, extack);
634 if (err)
635 return err;
636
637 for (i = 0; i <= NETCONFA_MAX; i++) {
638 if (!tb[i])
639 continue;
640
641 switch (i) {
642 case NETCONFA_IFINDEX:
643 break;
644 default:
645 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
646 return -EINVAL;
647 }
648 }
649
650 return 0;
651}
652
653static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
654 struct nlmsghdr *nlh,
655 struct netlink_ext_ack *extack)
656{
657 struct net *net = sock_net(in_skb->sk);
658 struct nlattr *tb[NETCONFA_MAX+1];
659 struct inet6_dev *in6_dev = NULL;
660 struct net_device *dev = NULL;
661 struct sk_buff *skb;
662 struct ipv6_devconf *devconf;
663 int ifindex;
664 int err;
665
666 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
667 if (err < 0)
668 return err;
669
670 if (!tb[NETCONFA_IFINDEX])
671 return -EINVAL;
672
673 err = -EINVAL;
674 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
675 switch (ifindex) {
676 case NETCONFA_IFINDEX_ALL:
677 devconf = net->ipv6.devconf_all;
678 break;
679 case NETCONFA_IFINDEX_DEFAULT:
680 devconf = net->ipv6.devconf_dflt;
681 break;
682 default:
683 dev = dev_get_by_index(net, ifindex);
684 if (!dev)
685 return -EINVAL;
686 in6_dev = in6_dev_get(dev);
687 if (!in6_dev)
688 goto errout;
689 devconf = &in6_dev->cnf;
690 break;
691 }
692
693 err = -ENOBUFS;
694 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
695 if (!skb)
696 goto errout;
697
698 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
699 NETLINK_CB(in_skb).portid,
700 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
701 NETCONFA_ALL);
702 if (err < 0) {
703 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
704 WARN_ON(err == -EMSGSIZE);
705 kfree_skb(skb);
706 goto errout;
707 }
708 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
709errout:
710 if (in6_dev)
711 in6_dev_put(in6_dev);
712 dev_put(dev);
713 return err;
714}
715
716/* Combine dev_addr_genid and dev_base_seq to detect changes.
717 */
718static u32 inet6_base_seq(const struct net *net)
719{
720 u32 res = atomic_read(&net->ipv6.dev_addr_genid) +
721 READ_ONCE(net->dev_base_seq);
722
723 /* Must not return 0 (see nl_dump_check_consistent()).
724 * Chose a value far away from 0.
725 */
726 if (!res)
727 res = 0x80000000;
728 return res;
729}
730
731static int inet6_netconf_dump_devconf(struct sk_buff *skb,
732 struct netlink_callback *cb)
733{
734 const struct nlmsghdr *nlh = cb->nlh;
735 struct net *net = sock_net(skb->sk);
736 struct {
737 unsigned long ifindex;
738 unsigned int all_default;
739 } *ctx = (void *)cb->ctx;
740 struct net_device *dev;
741 struct inet6_dev *idev;
742 int err = 0;
743
744 if (cb->strict_check) {
745 struct netlink_ext_ack *extack = cb->extack;
746 struct netconfmsg *ncm;
747
748 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
749 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
750 return -EINVAL;
751 }
752
753 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
754 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
755 return -EINVAL;
756 }
757 }
758
759 rcu_read_lock();
760 for_each_netdev_dump(net, dev, ctx->ifindex) {
761 idev = __in6_dev_get(dev);
762 if (!idev)
763 continue;
764 err = inet6_netconf_fill_devconf(skb, dev->ifindex,
765 &idev->cnf,
766 NETLINK_CB(cb->skb).portid,
767 nlh->nlmsg_seq,
768 RTM_NEWNETCONF,
769 NLM_F_MULTI,
770 NETCONFA_ALL);
771 if (err < 0)
772 goto done;
773 }
774 if (ctx->all_default == 0) {
775 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
776 net->ipv6.devconf_all,
777 NETLINK_CB(cb->skb).portid,
778 nlh->nlmsg_seq,
779 RTM_NEWNETCONF, NLM_F_MULTI,
780 NETCONFA_ALL);
781 if (err < 0)
782 goto done;
783 ctx->all_default++;
784 }
785 if (ctx->all_default == 1) {
786 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
787 net->ipv6.devconf_dflt,
788 NETLINK_CB(cb->skb).portid,
789 nlh->nlmsg_seq,
790 RTM_NEWNETCONF, NLM_F_MULTI,
791 NETCONFA_ALL);
792 if (err < 0)
793 goto done;
794 ctx->all_default++;
795 }
796done:
797 rcu_read_unlock();
798 return err;
799}
800
801#ifdef CONFIG_SYSCTL
802static void dev_forward_change(struct inet6_dev *idev)
803{
804 struct net_device *dev;
805 struct inet6_ifaddr *ifa;
806 LIST_HEAD(tmp_addr_list);
807
808 if (!idev)
809 return;
810 dev = idev->dev;
811 if (idev->cnf.forwarding)
812 dev_disable_lro(dev);
813 if (dev->flags & IFF_MULTICAST) {
814 if (idev->cnf.forwarding) {
815 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
816 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
817 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
818 } else {
819 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
820 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
821 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
822 }
823 }
824
825 read_lock_bh(&idev->lock);
826 list_for_each_entry(ifa, &idev->addr_list, if_list) {
827 if (ifa->flags&IFA_F_TENTATIVE)
828 continue;
829 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
830 }
831 read_unlock_bh(&idev->lock);
832
833 while (!list_empty(&tmp_addr_list)) {
834 ifa = list_first_entry(&tmp_addr_list,
835 struct inet6_ifaddr, if_list_aux);
836 list_del(&ifa->if_list_aux);
837 if (idev->cnf.forwarding)
838 addrconf_join_anycast(ifa);
839 else
840 addrconf_leave_anycast(ifa);
841 }
842
843 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
844 NETCONFA_FORWARDING,
845 dev->ifindex, &idev->cnf);
846}
847
848
849static void addrconf_forward_change(struct net *net, __s32 newf)
850{
851 struct net_device *dev;
852 struct inet6_dev *idev;
853
854 for_each_netdev(net, dev) {
855 idev = __in6_dev_get(dev);
856 if (idev) {
857 int changed = (!idev->cnf.forwarding) ^ (!newf);
858
859 WRITE_ONCE(idev->cnf.forwarding, newf);
860 if (changed)
861 dev_forward_change(idev);
862 }
863 }
864}
865
866static int addrconf_fixup_forwarding(const struct ctl_table *table, int *p, int newf)
867{
868 struct net *net;
869 int old;
870
871 if (!rtnl_trylock())
872 return restart_syscall();
873
874 net = (struct net *)table->extra2;
875 old = *p;
876 WRITE_ONCE(*p, newf);
877
878 if (p == &net->ipv6.devconf_dflt->forwarding) {
879 if ((!newf) ^ (!old))
880 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
881 NETCONFA_FORWARDING,
882 NETCONFA_IFINDEX_DEFAULT,
883 net->ipv6.devconf_dflt);
884 rtnl_unlock();
885 return 0;
886 }
887
888 if (p == &net->ipv6.devconf_all->forwarding) {
889 int old_dflt = net->ipv6.devconf_dflt->forwarding;
890
891 WRITE_ONCE(net->ipv6.devconf_dflt->forwarding, newf);
892 if ((!newf) ^ (!old_dflt))
893 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
894 NETCONFA_FORWARDING,
895 NETCONFA_IFINDEX_DEFAULT,
896 net->ipv6.devconf_dflt);
897
898 addrconf_forward_change(net, newf);
899 if ((!newf) ^ (!old))
900 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
901 NETCONFA_FORWARDING,
902 NETCONFA_IFINDEX_ALL,
903 net->ipv6.devconf_all);
904 } else if ((!newf) ^ (!old))
905 dev_forward_change((struct inet6_dev *)table->extra1);
906 rtnl_unlock();
907
908 if (newf)
909 rt6_purge_dflt_routers(net);
910 return 1;
911}
912
913static void addrconf_linkdown_change(struct net *net, __s32 newf)
914{
915 struct net_device *dev;
916 struct inet6_dev *idev;
917
918 for_each_netdev(net, dev) {
919 idev = __in6_dev_get(dev);
920 if (idev) {
921 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
922
923 WRITE_ONCE(idev->cnf.ignore_routes_with_linkdown, newf);
924 if (changed)
925 inet6_netconf_notify_devconf(dev_net(dev),
926 RTM_NEWNETCONF,
927 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
928 dev->ifindex,
929 &idev->cnf);
930 }
931 }
932}
933
934static int addrconf_fixup_linkdown(const struct ctl_table *table, int *p, int newf)
935{
936 struct net *net;
937 int old;
938
939 if (!rtnl_trylock())
940 return restart_syscall();
941
942 net = (struct net *)table->extra2;
943 old = *p;
944 WRITE_ONCE(*p, newf);
945
946 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
947 if ((!newf) ^ (!old))
948 inet6_netconf_notify_devconf(net,
949 RTM_NEWNETCONF,
950 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
951 NETCONFA_IFINDEX_DEFAULT,
952 net->ipv6.devconf_dflt);
953 rtnl_unlock();
954 return 0;
955 }
956
957 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
958 WRITE_ONCE(net->ipv6.devconf_dflt->ignore_routes_with_linkdown, newf);
959 addrconf_linkdown_change(net, newf);
960 if ((!newf) ^ (!old))
961 inet6_netconf_notify_devconf(net,
962 RTM_NEWNETCONF,
963 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
964 NETCONFA_IFINDEX_ALL,
965 net->ipv6.devconf_all);
966 }
967 rtnl_unlock();
968
969 return 1;
970}
971
972#endif
973
974/* Nobody refers to this ifaddr, destroy it */
975void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
976{
977 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
978
979#ifdef NET_REFCNT_DEBUG
980 pr_debug("%s\n", __func__);
981#endif
982
983 in6_dev_put(ifp->idev);
984
985 if (cancel_delayed_work(&ifp->dad_work))
986 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
987 ifp);
988
989 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
990 pr_warn("Freeing alive inet6 address %p\n", ifp);
991 return;
992 }
993
994 kfree_rcu(ifp, rcu);
995}
996
997static void
998ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
999{
1000 struct list_head *p;
1001 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
1002
1003 /*
1004 * Each device address list is sorted in order of scope -
1005 * global before linklocal.
1006 */
1007 list_for_each(p, &idev->addr_list) {
1008 struct inet6_ifaddr *ifa
1009 = list_entry(p, struct inet6_ifaddr, if_list);
1010 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
1011 break;
1012 }
1013
1014 list_add_tail_rcu(&ifp->if_list, p);
1015}
1016
1017static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
1018{
1019 u32 val = __ipv6_addr_jhash(addr, net_hash_mix(net));
1020
1021 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1022}
1023
1024static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1025 struct net_device *dev, unsigned int hash)
1026{
1027 struct inet6_ifaddr *ifp;
1028
1029 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1030 if (ipv6_addr_equal(&ifp->addr, addr)) {
1031 if (!dev || ifp->idev->dev == dev)
1032 return true;
1033 }
1034 }
1035 return false;
1036}
1037
1038static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1039{
1040 struct net *net = dev_net(dev);
1041 unsigned int hash = inet6_addr_hash(net, &ifa->addr);
1042 int err = 0;
1043
1044 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1045
1046 /* Ignore adding duplicate addresses on an interface */
1047 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) {
1048 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1049 err = -EEXIST;
1050 } else {
1051 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]);
1052 }
1053
1054 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1055
1056 return err;
1057}
1058
1059/* On success it returns ifp with increased reference count */
1060
1061static struct inet6_ifaddr *
1062ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1063 bool can_block, struct netlink_ext_ack *extack)
1064{
1065 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1066 int addr_type = ipv6_addr_type(cfg->pfx);
1067 struct net *net = dev_net(idev->dev);
1068 struct inet6_ifaddr *ifa = NULL;
1069 struct fib6_info *f6i = NULL;
1070 int err = 0;
1071
1072 if (addr_type == IPV6_ADDR_ANY) {
1073 NL_SET_ERR_MSG_MOD(extack, "Invalid address");
1074 return ERR_PTR(-EADDRNOTAVAIL);
1075 } else if (addr_type & IPV6_ADDR_MULTICAST &&
1076 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) {
1077 NL_SET_ERR_MSG_MOD(extack, "Cannot assign multicast address without \"IFA_F_MCAUTOJOIN\" flag");
1078 return ERR_PTR(-EADDRNOTAVAIL);
1079 } else if (!(idev->dev->flags & IFF_LOOPBACK) &&
1080 !netif_is_l3_master(idev->dev) &&
1081 addr_type & IPV6_ADDR_LOOPBACK) {
1082 NL_SET_ERR_MSG_MOD(extack, "Cannot assign loopback address on this device");
1083 return ERR_PTR(-EADDRNOTAVAIL);
1084 }
1085
1086 if (idev->dead) {
1087 NL_SET_ERR_MSG_MOD(extack, "device is going away");
1088 err = -ENODEV;
1089 goto out;
1090 }
1091
1092 if (idev->cnf.disable_ipv6) {
1093 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
1094 err = -EACCES;
1095 goto out;
1096 }
1097
1098 /* validator notifier needs to be blocking;
1099 * do not call in atomic context
1100 */
1101 if (can_block) {
1102 struct in6_validator_info i6vi = {
1103 .i6vi_addr = *cfg->pfx,
1104 .i6vi_dev = idev,
1105 .extack = extack,
1106 };
1107
1108 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1109 err = notifier_to_errno(err);
1110 if (err < 0)
1111 goto out;
1112 }
1113
1114 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT);
1115 if (!ifa) {
1116 err = -ENOBUFS;
1117 goto out;
1118 }
1119
1120 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags, extack);
1121 if (IS_ERR(f6i)) {
1122 err = PTR_ERR(f6i);
1123 f6i = NULL;
1124 goto out;
1125 }
1126
1127 neigh_parms_data_state_setall(idev->nd_parms);
1128
1129 ifa->addr = *cfg->pfx;
1130 if (cfg->peer_pfx)
1131 ifa->peer_addr = *cfg->peer_pfx;
1132
1133 spin_lock_init(&ifa->lock);
1134 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1135 INIT_HLIST_NODE(&ifa->addr_lst);
1136 ifa->scope = cfg->scope;
1137 ifa->prefix_len = cfg->plen;
1138 ifa->rt_priority = cfg->rt_priority;
1139 ifa->flags = cfg->ifa_flags;
1140 ifa->ifa_proto = cfg->ifa_proto;
1141 /* No need to add the TENTATIVE flag for addresses with NODAD */
1142 if (!(cfg->ifa_flags & IFA_F_NODAD))
1143 ifa->flags |= IFA_F_TENTATIVE;
1144 ifa->valid_lft = cfg->valid_lft;
1145 ifa->prefered_lft = cfg->preferred_lft;
1146 ifa->cstamp = ifa->tstamp = jiffies;
1147 ifa->tokenized = false;
1148
1149 ifa->rt = f6i;
1150
1151 ifa->idev = idev;
1152 in6_dev_hold(idev);
1153
1154 /* For caller */
1155 refcount_set(&ifa->refcnt, 1);
1156
1157 rcu_read_lock();
1158
1159 err = ipv6_add_addr_hash(idev->dev, ifa);
1160 if (err < 0) {
1161 rcu_read_unlock();
1162 goto out;
1163 }
1164
1165 write_lock_bh(&idev->lock);
1166
1167 /* Add to inet6_dev unicast addr list. */
1168 ipv6_link_dev_addr(idev, ifa);
1169
1170 if (ifa->flags&IFA_F_TEMPORARY) {
1171 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1172 in6_ifa_hold(ifa);
1173 }
1174
1175 in6_ifa_hold(ifa);
1176 write_unlock_bh(&idev->lock);
1177
1178 rcu_read_unlock();
1179
1180 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1181out:
1182 if (unlikely(err < 0)) {
1183 fib6_info_release(f6i);
1184
1185 if (ifa) {
1186 if (ifa->idev)
1187 in6_dev_put(ifa->idev);
1188 kfree(ifa);
1189 }
1190 ifa = ERR_PTR(err);
1191 }
1192
1193 return ifa;
1194}
1195
1196enum cleanup_prefix_rt_t {
1197 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1198 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1199 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1200};
1201
1202/*
1203 * Check, whether the prefix for ifp would still need a prefix route
1204 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1205 * constants.
1206 *
1207 * 1) we don't purge prefix if address was not permanent.
1208 * prefix is managed by its own lifetime.
1209 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1210 * 3) if there are no addresses, delete prefix.
1211 * 4) if there are still other permanent address(es),
1212 * corresponding prefix is still permanent.
1213 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1214 * don't purge the prefix, assume user space is managing it.
1215 * 6) otherwise, update prefix lifetime to the
1216 * longest valid lifetime among the corresponding
1217 * addresses on the device.
1218 * Note: subsequent RA will update lifetime.
1219 **/
1220static enum cleanup_prefix_rt_t
1221check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1222{
1223 struct inet6_ifaddr *ifa;
1224 struct inet6_dev *idev = ifp->idev;
1225 unsigned long lifetime;
1226 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1227
1228 *expires = jiffies;
1229
1230 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1231 if (ifa == ifp)
1232 continue;
1233 if (ifa->prefix_len != ifp->prefix_len ||
1234 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1235 ifp->prefix_len))
1236 continue;
1237 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1238 return CLEANUP_PREFIX_RT_NOP;
1239
1240 action = CLEANUP_PREFIX_RT_EXPIRE;
1241
1242 spin_lock(&ifa->lock);
1243
1244 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1245 /*
1246 * Note: Because this address is
1247 * not permanent, lifetime <
1248 * LONG_MAX / HZ here.
1249 */
1250 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1251 *expires = ifa->tstamp + lifetime * HZ;
1252 spin_unlock(&ifa->lock);
1253 }
1254
1255 return action;
1256}
1257
1258static void
1259cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1260 bool del_rt, bool del_peer)
1261{
1262 struct fib6_table *table;
1263 struct fib6_info *f6i;
1264
1265 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1266 ifp->prefix_len,
1267 ifp->idev->dev, 0, RTF_DEFAULT, true);
1268 if (f6i) {
1269 if (del_rt)
1270 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1271 else {
1272 if (!(f6i->fib6_flags & RTF_EXPIRES)) {
1273 table = f6i->fib6_table;
1274 spin_lock_bh(&table->tb6_lock);
1275
1276 fib6_set_expires(f6i, expires);
1277 fib6_add_gc_list(f6i);
1278
1279 spin_unlock_bh(&table->tb6_lock);
1280 }
1281 fib6_info_release(f6i);
1282 }
1283 }
1284}
1285
1286
1287/* This function wants to get referenced ifp and releases it before return */
1288
1289static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1290{
1291 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1292 struct net *net = dev_net(ifp->idev->dev);
1293 unsigned long expires;
1294 int state;
1295
1296 ASSERT_RTNL();
1297
1298 spin_lock_bh(&ifp->lock);
1299 state = ifp->state;
1300 ifp->state = INET6_IFADDR_STATE_DEAD;
1301 spin_unlock_bh(&ifp->lock);
1302
1303 if (state == INET6_IFADDR_STATE_DEAD)
1304 goto out;
1305
1306 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1307 hlist_del_init_rcu(&ifp->addr_lst);
1308 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1309
1310 write_lock_bh(&ifp->idev->lock);
1311
1312 if (ifp->flags&IFA_F_TEMPORARY) {
1313 list_del(&ifp->tmp_list);
1314 if (ifp->ifpub) {
1315 in6_ifa_put(ifp->ifpub);
1316 ifp->ifpub = NULL;
1317 }
1318 __in6_ifa_put(ifp);
1319 }
1320
1321 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1322 action = check_cleanup_prefix_route(ifp, &expires);
1323
1324 list_del_rcu(&ifp->if_list);
1325 __in6_ifa_put(ifp);
1326
1327 write_unlock_bh(&ifp->idev->lock);
1328
1329 addrconf_del_dad_work(ifp);
1330
1331 ipv6_ifa_notify(RTM_DELADDR, ifp);
1332
1333 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1334
1335 if (action != CLEANUP_PREFIX_RT_NOP) {
1336 cleanup_prefix_route(ifp, expires,
1337 action == CLEANUP_PREFIX_RT_DEL, false);
1338 }
1339
1340 /* clean up prefsrc entries */
1341 rt6_remove_prefsrc(ifp);
1342out:
1343 in6_ifa_put(ifp);
1344}
1345
1346static unsigned long ipv6_get_regen_advance(const struct inet6_dev *idev)
1347{
1348 return READ_ONCE(idev->cnf.regen_min_advance) +
1349 READ_ONCE(idev->cnf.regen_max_retry) *
1350 READ_ONCE(idev->cnf.dad_transmits) *
1351 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1352}
1353
1354static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1355{
1356 struct inet6_dev *idev = ifp->idev;
1357 unsigned long tmp_tstamp, age;
1358 unsigned long regen_advance;
1359 unsigned long now = jiffies;
1360 u32 if_public_preferred_lft;
1361 s32 cnf_temp_preferred_lft;
1362 struct inet6_ifaddr *ift;
1363 struct ifa6_config cfg;
1364 long max_desync_factor;
1365 struct in6_addr addr;
1366 int ret = 0;
1367
1368 write_lock_bh(&idev->lock);
1369
1370retry:
1371 in6_dev_hold(idev);
1372 if (READ_ONCE(idev->cnf.use_tempaddr) <= 0) {
1373 write_unlock_bh(&idev->lock);
1374 pr_info("%s: use_tempaddr is disabled\n", __func__);
1375 in6_dev_put(idev);
1376 ret = -1;
1377 goto out;
1378 }
1379 spin_lock_bh(&ifp->lock);
1380 if (ifp->regen_count++ >= READ_ONCE(idev->cnf.regen_max_retry)) {
1381 WRITE_ONCE(idev->cnf.use_tempaddr, -1); /*XXX*/
1382 spin_unlock_bh(&ifp->lock);
1383 write_unlock_bh(&idev->lock);
1384 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1385 __func__);
1386 in6_dev_put(idev);
1387 ret = -1;
1388 goto out;
1389 }
1390 in6_ifa_hold(ifp);
1391 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1392 ipv6_gen_rnd_iid(&addr);
1393
1394 age = (now - ifp->tstamp) / HZ;
1395
1396 regen_advance = ipv6_get_regen_advance(idev);
1397
1398 /* recalculate max_desync_factor each time and update
1399 * idev->desync_factor if it's larger
1400 */
1401 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1402 max_desync_factor = min_t(long,
1403 READ_ONCE(idev->cnf.max_desync_factor),
1404 cnf_temp_preferred_lft - regen_advance);
1405
1406 if (unlikely(idev->desync_factor > max_desync_factor)) {
1407 if (max_desync_factor > 0) {
1408 get_random_bytes(&idev->desync_factor,
1409 sizeof(idev->desync_factor));
1410 idev->desync_factor %= max_desync_factor;
1411 } else {
1412 idev->desync_factor = 0;
1413 }
1414 }
1415
1416 if_public_preferred_lft = ifp->prefered_lft;
1417
1418 memset(&cfg, 0, sizeof(cfg));
1419 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1420 READ_ONCE(idev->cnf.temp_valid_lft) + age);
1421 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1422 cfg.preferred_lft = min_t(__u32, if_public_preferred_lft, cfg.preferred_lft);
1423 cfg.preferred_lft = min_t(__u32, cfg.valid_lft, cfg.preferred_lft);
1424
1425 cfg.plen = ifp->prefix_len;
1426 tmp_tstamp = ifp->tstamp;
1427 spin_unlock_bh(&ifp->lock);
1428
1429 write_unlock_bh(&idev->lock);
1430
1431 /* From RFC 4941:
1432 *
1433 * A temporary address is created only if this calculated Preferred
1434 * Lifetime is greater than REGEN_ADVANCE time units. In
1435 * particular, an implementation must not create a temporary address
1436 * with a zero Preferred Lifetime.
1437 *
1438 * ...
1439 *
1440 * When creating a temporary address, the lifetime values MUST be
1441 * derived from the corresponding prefix as follows:
1442 *
1443 * ...
1444 *
1445 * * Its Preferred Lifetime is the lower of the Preferred Lifetime
1446 * of the public address or TEMP_PREFERRED_LIFETIME -
1447 * DESYNC_FACTOR.
1448 *
1449 * To comply with the RFC's requirements, clamp the preferred lifetime
1450 * to a minimum of regen_advance, unless that would exceed valid_lft or
1451 * ifp->prefered_lft.
1452 *
1453 * Use age calculation as in addrconf_verify to avoid unnecessary
1454 * temporary addresses being generated.
1455 */
1456 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1457 if (cfg.preferred_lft <= regen_advance + age) {
1458 cfg.preferred_lft = regen_advance + age + 1;
1459 if (cfg.preferred_lft > cfg.valid_lft ||
1460 cfg.preferred_lft > if_public_preferred_lft) {
1461 in6_ifa_put(ifp);
1462 in6_dev_put(idev);
1463 ret = -1;
1464 goto out;
1465 }
1466 }
1467
1468 cfg.ifa_flags = IFA_F_TEMPORARY;
1469 /* set in addrconf_prefix_rcv() */
1470 if (ifp->flags & IFA_F_OPTIMISTIC)
1471 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1472
1473 cfg.pfx = &addr;
1474 cfg.scope = ipv6_addr_scope(cfg.pfx);
1475
1476 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1477 if (IS_ERR(ift)) {
1478 in6_ifa_put(ifp);
1479 in6_dev_put(idev);
1480 pr_info("%s: retry temporary address regeneration\n", __func__);
1481 write_lock_bh(&idev->lock);
1482 goto retry;
1483 }
1484
1485 spin_lock_bh(&ift->lock);
1486 ift->ifpub = ifp;
1487 ift->cstamp = now;
1488 ift->tstamp = tmp_tstamp;
1489 spin_unlock_bh(&ift->lock);
1490
1491 addrconf_dad_start(ift);
1492 in6_ifa_put(ift);
1493 in6_dev_put(idev);
1494out:
1495 return ret;
1496}
1497
1498/*
1499 * Choose an appropriate source address (RFC3484)
1500 */
1501enum {
1502 IPV6_SADDR_RULE_INIT = 0,
1503 IPV6_SADDR_RULE_LOCAL,
1504 IPV6_SADDR_RULE_SCOPE,
1505 IPV6_SADDR_RULE_PREFERRED,
1506#ifdef CONFIG_IPV6_MIP6
1507 IPV6_SADDR_RULE_HOA,
1508#endif
1509 IPV6_SADDR_RULE_OIF,
1510 IPV6_SADDR_RULE_LABEL,
1511 IPV6_SADDR_RULE_PRIVACY,
1512 IPV6_SADDR_RULE_ORCHID,
1513 IPV6_SADDR_RULE_PREFIX,
1514#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1515 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1516#endif
1517 IPV6_SADDR_RULE_MAX
1518};
1519
1520struct ipv6_saddr_score {
1521 int rule;
1522 int addr_type;
1523 struct inet6_ifaddr *ifa;
1524 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1525 int scopedist;
1526 int matchlen;
1527};
1528
1529struct ipv6_saddr_dst {
1530 const struct in6_addr *addr;
1531 int ifindex;
1532 int scope;
1533 int label;
1534 unsigned int prefs;
1535};
1536
1537static inline int ipv6_saddr_preferred(int type)
1538{
1539 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1540 return 1;
1541 return 0;
1542}
1543
1544static bool ipv6_use_optimistic_addr(const struct net *net,
1545 const struct inet6_dev *idev)
1546{
1547#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1548 if (!idev)
1549 return false;
1550 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) &&
1551 !READ_ONCE(idev->cnf.optimistic_dad))
1552 return false;
1553 if (!READ_ONCE(net->ipv6.devconf_all->use_optimistic) &&
1554 !READ_ONCE(idev->cnf.use_optimistic))
1555 return false;
1556
1557 return true;
1558#else
1559 return false;
1560#endif
1561}
1562
1563static bool ipv6_allow_optimistic_dad(const struct net *net,
1564 const struct inet6_dev *idev)
1565{
1566#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1567 if (!idev)
1568 return false;
1569 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) &&
1570 !READ_ONCE(idev->cnf.optimistic_dad))
1571 return false;
1572
1573 return true;
1574#else
1575 return false;
1576#endif
1577}
1578
1579static int ipv6_get_saddr_eval(struct net *net,
1580 struct ipv6_saddr_score *score,
1581 struct ipv6_saddr_dst *dst,
1582 int i)
1583{
1584 int ret;
1585
1586 if (i <= score->rule) {
1587 switch (i) {
1588 case IPV6_SADDR_RULE_SCOPE:
1589 ret = score->scopedist;
1590 break;
1591 case IPV6_SADDR_RULE_PREFIX:
1592 ret = score->matchlen;
1593 break;
1594 default:
1595 ret = !!test_bit(i, score->scorebits);
1596 }
1597 goto out;
1598 }
1599
1600 switch (i) {
1601 case IPV6_SADDR_RULE_INIT:
1602 /* Rule 0: remember if hiscore is not ready yet */
1603 ret = !!score->ifa;
1604 break;
1605 case IPV6_SADDR_RULE_LOCAL:
1606 /* Rule 1: Prefer same address */
1607 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1608 break;
1609 case IPV6_SADDR_RULE_SCOPE:
1610 /* Rule 2: Prefer appropriate scope
1611 *
1612 * ret
1613 * ^
1614 * -1 | d 15
1615 * ---+--+-+---> scope
1616 * |
1617 * | d is scope of the destination.
1618 * B-d | \
1619 * | \ <- smaller scope is better if
1620 * B-15 | \ if scope is enough for destination.
1621 * | ret = B - scope (-1 <= scope >= d <= 15).
1622 * d-C-1 | /
1623 * |/ <- greater is better
1624 * -C / if scope is not enough for destination.
1625 * /| ret = scope - C (-1 <= d < scope <= 15).
1626 *
1627 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1628 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1629 * Assume B = 0 and we get C > 29.
1630 */
1631 ret = __ipv6_addr_src_scope(score->addr_type);
1632 if (ret >= dst->scope)
1633 ret = -ret;
1634 else
1635 ret -= 128; /* 30 is enough */
1636 score->scopedist = ret;
1637 break;
1638 case IPV6_SADDR_RULE_PREFERRED:
1639 {
1640 /* Rule 3: Avoid deprecated and optimistic addresses */
1641 u8 avoid = IFA_F_DEPRECATED;
1642
1643 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1644 avoid |= IFA_F_OPTIMISTIC;
1645 ret = ipv6_saddr_preferred(score->addr_type) ||
1646 !(score->ifa->flags & avoid);
1647 break;
1648 }
1649#ifdef CONFIG_IPV6_MIP6
1650 case IPV6_SADDR_RULE_HOA:
1651 {
1652 /* Rule 4: Prefer home address */
1653 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1654 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1655 break;
1656 }
1657#endif
1658 case IPV6_SADDR_RULE_OIF:
1659 /* Rule 5: Prefer outgoing interface */
1660 ret = (!dst->ifindex ||
1661 dst->ifindex == score->ifa->idev->dev->ifindex);
1662 break;
1663 case IPV6_SADDR_RULE_LABEL:
1664 /* Rule 6: Prefer matching label */
1665 ret = ipv6_addr_label(net,
1666 &score->ifa->addr, score->addr_type,
1667 score->ifa->idev->dev->ifindex) == dst->label;
1668 break;
1669 case IPV6_SADDR_RULE_PRIVACY:
1670 {
1671 /* Rule 7: Prefer public address
1672 * Note: prefer temporary address if use_tempaddr >= 2
1673 */
1674 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1675 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1676 READ_ONCE(score->ifa->idev->cnf.use_tempaddr) >= 2;
1677 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1678 break;
1679 }
1680 case IPV6_SADDR_RULE_ORCHID:
1681 /* Rule 8-: Prefer ORCHID vs ORCHID or
1682 * non-ORCHID vs non-ORCHID
1683 */
1684 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1685 ipv6_addr_orchid(dst->addr));
1686 break;
1687 case IPV6_SADDR_RULE_PREFIX:
1688 /* Rule 8: Use longest matching prefix */
1689 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1690 if (ret > score->ifa->prefix_len)
1691 ret = score->ifa->prefix_len;
1692 score->matchlen = ret;
1693 break;
1694#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1695 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1696 /* Optimistic addresses still have lower precedence than other
1697 * preferred addresses.
1698 */
1699 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1700 break;
1701#endif
1702 default:
1703 ret = 0;
1704 }
1705
1706 if (ret)
1707 __set_bit(i, score->scorebits);
1708 score->rule = i;
1709out:
1710 return ret;
1711}
1712
1713static int __ipv6_dev_get_saddr(struct net *net,
1714 struct ipv6_saddr_dst *dst,
1715 struct inet6_dev *idev,
1716 struct ipv6_saddr_score *scores,
1717 int hiscore_idx)
1718{
1719 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1720
1721 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1722 int i;
1723
1724 /*
1725 * - Tentative Address (RFC2462 section 5.4)
1726 * - A tentative address is not considered
1727 * "assigned to an interface" in the traditional
1728 * sense, unless it is also flagged as optimistic.
1729 * - Candidate Source Address (section 4)
1730 * - In any case, anycast addresses, multicast
1731 * addresses, and the unspecified address MUST
1732 * NOT be included in a candidate set.
1733 */
1734 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1735 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1736 continue;
1737
1738 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1739
1740 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1741 score->addr_type & IPV6_ADDR_MULTICAST)) {
1742 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1743 idev->dev->name);
1744 continue;
1745 }
1746
1747 score->rule = -1;
1748 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1749
1750 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1751 int minihiscore, miniscore;
1752
1753 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1754 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1755
1756 if (minihiscore > miniscore) {
1757 if (i == IPV6_SADDR_RULE_SCOPE &&
1758 score->scopedist > 0) {
1759 /*
1760 * special case:
1761 * each remaining entry
1762 * has too small (not enough)
1763 * scope, because ifa entries
1764 * are sorted by their scope
1765 * values.
1766 */
1767 goto out;
1768 }
1769 break;
1770 } else if (minihiscore < miniscore) {
1771 swap(hiscore, score);
1772 hiscore_idx = 1 - hiscore_idx;
1773
1774 /* restore our iterator */
1775 score->ifa = hiscore->ifa;
1776
1777 break;
1778 }
1779 }
1780 }
1781out:
1782 return hiscore_idx;
1783}
1784
1785static int ipv6_get_saddr_master(struct net *net,
1786 const struct net_device *dst_dev,
1787 const struct net_device *master,
1788 struct ipv6_saddr_dst *dst,
1789 struct ipv6_saddr_score *scores,
1790 int hiscore_idx)
1791{
1792 struct inet6_dev *idev;
1793
1794 idev = __in6_dev_get(dst_dev);
1795 if (idev)
1796 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1797 scores, hiscore_idx);
1798
1799 idev = __in6_dev_get(master);
1800 if (idev)
1801 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1802 scores, hiscore_idx);
1803
1804 return hiscore_idx;
1805}
1806
1807int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1808 const struct in6_addr *daddr, unsigned int prefs,
1809 struct in6_addr *saddr)
1810{
1811 struct ipv6_saddr_score scores[2], *hiscore;
1812 struct ipv6_saddr_dst dst;
1813 struct inet6_dev *idev;
1814 struct net_device *dev;
1815 int dst_type;
1816 bool use_oif_addr = false;
1817 int hiscore_idx = 0;
1818 int ret = 0;
1819
1820 dst_type = __ipv6_addr_type(daddr);
1821 dst.addr = daddr;
1822 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1823 dst.scope = __ipv6_addr_src_scope(dst_type);
1824 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1825 dst.prefs = prefs;
1826
1827 scores[hiscore_idx].rule = -1;
1828 scores[hiscore_idx].ifa = NULL;
1829
1830 rcu_read_lock();
1831
1832 /* Candidate Source Address (section 4)
1833 * - multicast and link-local destination address,
1834 * the set of candidate source address MUST only
1835 * include addresses assigned to interfaces
1836 * belonging to the same link as the outgoing
1837 * interface.
1838 * (- For site-local destination addresses, the
1839 * set of candidate source addresses MUST only
1840 * include addresses assigned to interfaces
1841 * belonging to the same site as the outgoing
1842 * interface.)
1843 * - "It is RECOMMENDED that the candidate source addresses
1844 * be the set of unicast addresses assigned to the
1845 * interface that will be used to send to the destination
1846 * (the 'outgoing' interface)." (RFC 6724)
1847 */
1848 if (dst_dev) {
1849 idev = __in6_dev_get(dst_dev);
1850 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1851 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1852 (idev && READ_ONCE(idev->cnf.use_oif_addrs_only))) {
1853 use_oif_addr = true;
1854 }
1855 }
1856
1857 if (use_oif_addr) {
1858 if (idev)
1859 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1860 } else {
1861 const struct net_device *master;
1862 int master_idx = 0;
1863
1864 /* if dst_dev exists and is enslaved to an L3 device, then
1865 * prefer addresses from dst_dev and then the master over
1866 * any other enslaved devices in the L3 domain.
1867 */
1868 master = l3mdev_master_dev_rcu(dst_dev);
1869 if (master) {
1870 master_idx = master->ifindex;
1871
1872 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1873 master, &dst,
1874 scores, hiscore_idx);
1875
1876 if (scores[hiscore_idx].ifa &&
1877 scores[hiscore_idx].scopedist >= 0)
1878 goto out;
1879 }
1880
1881 for_each_netdev_rcu(net, dev) {
1882 /* only consider addresses on devices in the
1883 * same L3 domain
1884 */
1885 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1886 continue;
1887 idev = __in6_dev_get(dev);
1888 if (!idev)
1889 continue;
1890 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1891 }
1892 }
1893
1894out:
1895 hiscore = &scores[hiscore_idx];
1896 if (!hiscore->ifa)
1897 ret = -EADDRNOTAVAIL;
1898 else
1899 *saddr = hiscore->ifa->addr;
1900
1901 rcu_read_unlock();
1902 return ret;
1903}
1904EXPORT_SYMBOL(ipv6_dev_get_saddr);
1905
1906static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1907 u32 banned_flags)
1908{
1909 struct inet6_ifaddr *ifp;
1910 int err = -EADDRNOTAVAIL;
1911
1912 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1913 if (ifp->scope > IFA_LINK)
1914 break;
1915 if (ifp->scope == IFA_LINK &&
1916 !(ifp->flags & banned_flags)) {
1917 *addr = ifp->addr;
1918 err = 0;
1919 break;
1920 }
1921 }
1922 return err;
1923}
1924
1925int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1926 u32 banned_flags)
1927{
1928 struct inet6_dev *idev;
1929 int err = -EADDRNOTAVAIL;
1930
1931 rcu_read_lock();
1932 idev = __in6_dev_get(dev);
1933 if (idev) {
1934 read_lock_bh(&idev->lock);
1935 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1936 read_unlock_bh(&idev->lock);
1937 }
1938 rcu_read_unlock();
1939 return err;
1940}
1941
1942static int ipv6_count_addresses(const struct inet6_dev *idev)
1943{
1944 const struct inet6_ifaddr *ifp;
1945 int cnt = 0;
1946
1947 rcu_read_lock();
1948 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1949 cnt++;
1950 rcu_read_unlock();
1951 return cnt;
1952}
1953
1954int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1955 const struct net_device *dev, int strict)
1956{
1957 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1958 strict, IFA_F_TENTATIVE);
1959}
1960EXPORT_SYMBOL(ipv6_chk_addr);
1961
1962/* device argument is used to find the L3 domain of interest. If
1963 * skip_dev_check is set, then the ifp device is not checked against
1964 * the passed in dev argument. So the 2 cases for addresses checks are:
1965 * 1. does the address exist in the L3 domain that dev is part of
1966 * (skip_dev_check = true), or
1967 *
1968 * 2. does the address exist on the specific device
1969 * (skip_dev_check = false)
1970 */
1971static struct net_device *
1972__ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1973 const struct net_device *dev, bool skip_dev_check,
1974 int strict, u32 banned_flags)
1975{
1976 unsigned int hash = inet6_addr_hash(net, addr);
1977 struct net_device *l3mdev, *ndev;
1978 struct inet6_ifaddr *ifp;
1979 u32 ifp_flags;
1980
1981 rcu_read_lock();
1982
1983 l3mdev = l3mdev_master_dev_rcu(dev);
1984 if (skip_dev_check)
1985 dev = NULL;
1986
1987 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1988 ndev = ifp->idev->dev;
1989
1990 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1991 continue;
1992
1993 /* Decouple optimistic from tentative for evaluation here.
1994 * Ban optimistic addresses explicitly, when required.
1995 */
1996 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1997 ? (ifp->flags&~IFA_F_TENTATIVE)
1998 : ifp->flags;
1999 if (ipv6_addr_equal(&ifp->addr, addr) &&
2000 !(ifp_flags&banned_flags) &&
2001 (!dev || ndev == dev ||
2002 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
2003 rcu_read_unlock();
2004 return ndev;
2005 }
2006 }
2007
2008 rcu_read_unlock();
2009 return NULL;
2010}
2011
2012int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
2013 const struct net_device *dev, bool skip_dev_check,
2014 int strict, u32 banned_flags)
2015{
2016 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
2017 strict, banned_flags) ? 1 : 0;
2018}
2019EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
2020
2021
2022/* Compares an address/prefix_len with addresses on device @dev.
2023 * If one is found it returns true.
2024 */
2025bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
2026 const unsigned int prefix_len, struct net_device *dev)
2027{
2028 const struct inet6_ifaddr *ifa;
2029 const struct inet6_dev *idev;
2030 bool ret = false;
2031
2032 rcu_read_lock();
2033 idev = __in6_dev_get(dev);
2034 if (idev) {
2035 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2036 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
2037 if (ret)
2038 break;
2039 }
2040 }
2041 rcu_read_unlock();
2042
2043 return ret;
2044}
2045EXPORT_SYMBOL(ipv6_chk_custom_prefix);
2046
2047int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
2048{
2049 const struct inet6_ifaddr *ifa;
2050 const struct inet6_dev *idev;
2051 int onlink;
2052
2053 onlink = 0;
2054 rcu_read_lock();
2055 idev = __in6_dev_get(dev);
2056 if (idev) {
2057 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2058 onlink = ipv6_prefix_equal(addr, &ifa->addr,
2059 ifa->prefix_len);
2060 if (onlink)
2061 break;
2062 }
2063 }
2064 rcu_read_unlock();
2065 return onlink;
2066}
2067EXPORT_SYMBOL(ipv6_chk_prefix);
2068
2069/**
2070 * ipv6_dev_find - find the first device with a given source address.
2071 * @net: the net namespace
2072 * @addr: the source address
2073 * @dev: used to find the L3 domain of interest
2074 *
2075 * The caller should be protected by RCU, or RTNL.
2076 */
2077struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2078 struct net_device *dev)
2079{
2080 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2081 IFA_F_TENTATIVE);
2082}
2083EXPORT_SYMBOL(ipv6_dev_find);
2084
2085struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2086 struct net_device *dev, int strict)
2087{
2088 unsigned int hash = inet6_addr_hash(net, addr);
2089 struct inet6_ifaddr *ifp, *result = NULL;
2090
2091 rcu_read_lock();
2092 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
2093 if (ipv6_addr_equal(&ifp->addr, addr)) {
2094 if (!dev || ifp->idev->dev == dev ||
2095 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2096 if (in6_ifa_hold_safe(ifp)) {
2097 result = ifp;
2098 break;
2099 }
2100 }
2101 }
2102 }
2103 rcu_read_unlock();
2104
2105 return result;
2106}
2107
2108/* Gets referenced address, destroys ifaddr */
2109
2110static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2111{
2112 if (dad_failed)
2113 ifp->flags |= IFA_F_DADFAILED;
2114
2115 if (ifp->flags&IFA_F_TEMPORARY) {
2116 struct inet6_ifaddr *ifpub;
2117 spin_lock_bh(&ifp->lock);
2118 ifpub = ifp->ifpub;
2119 if (ifpub) {
2120 in6_ifa_hold(ifpub);
2121 spin_unlock_bh(&ifp->lock);
2122 ipv6_create_tempaddr(ifpub, true);
2123 in6_ifa_put(ifpub);
2124 } else {
2125 spin_unlock_bh(&ifp->lock);
2126 }
2127 ipv6_del_addr(ifp);
2128 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2129 spin_lock_bh(&ifp->lock);
2130 addrconf_del_dad_work(ifp);
2131 ifp->flags |= IFA_F_TENTATIVE;
2132 if (dad_failed)
2133 ifp->flags &= ~IFA_F_OPTIMISTIC;
2134 spin_unlock_bh(&ifp->lock);
2135 if (dad_failed)
2136 ipv6_ifa_notify(0, ifp);
2137 in6_ifa_put(ifp);
2138 } else {
2139 ipv6_del_addr(ifp);
2140 }
2141}
2142
2143static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2144{
2145 int err = -ENOENT;
2146
2147 spin_lock_bh(&ifp->lock);
2148 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2149 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2150 err = 0;
2151 }
2152 spin_unlock_bh(&ifp->lock);
2153
2154 return err;
2155}
2156
2157void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2158{
2159 struct inet6_dev *idev = ifp->idev;
2160 struct net *net = dev_net(idev->dev);
2161 int max_addresses;
2162
2163 if (addrconf_dad_end(ifp)) {
2164 in6_ifa_put(ifp);
2165 return;
2166 }
2167
2168 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2169 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2170
2171 spin_lock_bh(&ifp->lock);
2172
2173 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2174 struct in6_addr new_addr;
2175 struct inet6_ifaddr *ifp2;
2176 int retries = ifp->stable_privacy_retry + 1;
2177 struct ifa6_config cfg = {
2178 .pfx = &new_addr,
2179 .plen = ifp->prefix_len,
2180 .ifa_flags = ifp->flags,
2181 .valid_lft = ifp->valid_lft,
2182 .preferred_lft = ifp->prefered_lft,
2183 .scope = ifp->scope,
2184 };
2185
2186 if (retries > net->ipv6.sysctl.idgen_retries) {
2187 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2188 ifp->idev->dev->name);
2189 goto errdad;
2190 }
2191
2192 new_addr = ifp->addr;
2193 if (ipv6_generate_stable_address(&new_addr, retries,
2194 idev))
2195 goto errdad;
2196
2197 spin_unlock_bh(&ifp->lock);
2198
2199 max_addresses = READ_ONCE(idev->cnf.max_addresses);
2200 if (max_addresses &&
2201 ipv6_count_addresses(idev) >= max_addresses)
2202 goto lock_errdad;
2203
2204 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2205 ifp->idev->dev->name);
2206
2207 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2208 if (IS_ERR(ifp2))
2209 goto lock_errdad;
2210
2211 spin_lock_bh(&ifp2->lock);
2212 ifp2->stable_privacy_retry = retries;
2213 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2214 spin_unlock_bh(&ifp2->lock);
2215
2216 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2217 in6_ifa_put(ifp2);
2218lock_errdad:
2219 spin_lock_bh(&ifp->lock);
2220 }
2221
2222errdad:
2223 /* transition from _POSTDAD to _ERRDAD */
2224 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2225 spin_unlock_bh(&ifp->lock);
2226
2227 addrconf_mod_dad_work(ifp, 0);
2228 in6_ifa_put(ifp);
2229}
2230
2231/* Join to solicited addr multicast group.
2232 * caller must hold RTNL */
2233void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2234{
2235 struct in6_addr maddr;
2236
2237 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2238 return;
2239
2240 addrconf_addr_solict_mult(addr, &maddr);
2241 ipv6_dev_mc_inc(dev, &maddr);
2242}
2243
2244/* caller must hold RTNL */
2245void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2246{
2247 struct in6_addr maddr;
2248
2249 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2250 return;
2251
2252 addrconf_addr_solict_mult(addr, &maddr);
2253 __ipv6_dev_mc_dec(idev, &maddr);
2254}
2255
2256/* caller must hold RTNL */
2257static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2258{
2259 struct in6_addr addr;
2260
2261 if (ifp->prefix_len >= 127) /* RFC 6164 */
2262 return;
2263 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2264 if (ipv6_addr_any(&addr))
2265 return;
2266 __ipv6_dev_ac_inc(ifp->idev, &addr);
2267}
2268
2269/* caller must hold RTNL */
2270static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2271{
2272 struct in6_addr addr;
2273
2274 if (ifp->prefix_len >= 127) /* RFC 6164 */
2275 return;
2276 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2277 if (ipv6_addr_any(&addr))
2278 return;
2279 __ipv6_dev_ac_dec(ifp->idev, &addr);
2280}
2281
2282static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2283{
2284 switch (dev->addr_len) {
2285 case ETH_ALEN:
2286 memcpy(eui, dev->dev_addr, 3);
2287 eui[3] = 0xFF;
2288 eui[4] = 0xFE;
2289 memcpy(eui + 5, dev->dev_addr + 3, 3);
2290 break;
2291 case EUI64_ADDR_LEN:
2292 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2293 eui[0] ^= 2;
2294 break;
2295 default:
2296 return -1;
2297 }
2298
2299 return 0;
2300}
2301
2302static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2303{
2304 const union fwnet_hwaddr *ha;
2305
2306 if (dev->addr_len != FWNET_ALEN)
2307 return -1;
2308
2309 ha = (const union fwnet_hwaddr *)dev->dev_addr;
2310
2311 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2312 eui[0] ^= 2;
2313 return 0;
2314}
2315
2316static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2317{
2318 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2319 if (dev->addr_len != ARCNET_ALEN)
2320 return -1;
2321 memset(eui, 0, 7);
2322 eui[7] = *(u8 *)dev->dev_addr;
2323 return 0;
2324}
2325
2326static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2327{
2328 if (dev->addr_len != INFINIBAND_ALEN)
2329 return -1;
2330 memcpy(eui, dev->dev_addr + 12, 8);
2331 eui[0] |= 2;
2332 return 0;
2333}
2334
2335static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2336{
2337 if (addr == 0)
2338 return -1;
2339 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2340 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2341 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2342 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2343 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2344 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2345 eui[1] = 0;
2346 eui[2] = 0x5E;
2347 eui[3] = 0xFE;
2348 memcpy(eui + 4, &addr, 4);
2349 return 0;
2350}
2351
2352static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2353{
2354 if (dev->priv_flags & IFF_ISATAP)
2355 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2356 return -1;
2357}
2358
2359static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2360{
2361 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2362}
2363
2364static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2365{
2366 memcpy(eui, dev->perm_addr, 3);
2367 memcpy(eui + 5, dev->perm_addr + 3, 3);
2368 eui[3] = 0xFF;
2369 eui[4] = 0xFE;
2370 eui[0] ^= 2;
2371 return 0;
2372}
2373
2374static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2375{
2376 switch (dev->type) {
2377 case ARPHRD_ETHER:
2378 case ARPHRD_FDDI:
2379 return addrconf_ifid_eui48(eui, dev);
2380 case ARPHRD_ARCNET:
2381 return addrconf_ifid_arcnet(eui, dev);
2382 case ARPHRD_INFINIBAND:
2383 return addrconf_ifid_infiniband(eui, dev);
2384 case ARPHRD_SIT:
2385 return addrconf_ifid_sit(eui, dev);
2386 case ARPHRD_IPGRE:
2387 case ARPHRD_TUNNEL:
2388 return addrconf_ifid_gre(eui, dev);
2389 case ARPHRD_6LOWPAN:
2390 return addrconf_ifid_6lowpan(eui, dev);
2391 case ARPHRD_IEEE1394:
2392 return addrconf_ifid_ieee1394(eui, dev);
2393 case ARPHRD_TUNNEL6:
2394 case ARPHRD_IP6GRE:
2395 case ARPHRD_RAWIP:
2396 return addrconf_ifid_ip6tnl(eui, dev);
2397 }
2398 return -1;
2399}
2400
2401static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2402{
2403 int err = -1;
2404 struct inet6_ifaddr *ifp;
2405
2406 read_lock_bh(&idev->lock);
2407 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2408 if (ifp->scope > IFA_LINK)
2409 break;
2410 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2411 memcpy(eui, ifp->addr.s6_addr+8, 8);
2412 err = 0;
2413 break;
2414 }
2415 }
2416 read_unlock_bh(&idev->lock);
2417 return err;
2418}
2419
2420/* Generation of a randomized Interface Identifier
2421 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2422 */
2423
2424static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2425{
2426regen:
2427 get_random_bytes(&addr->s6_addr[8], 8);
2428
2429 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2430 * check if generated address is not inappropriate:
2431 *
2432 * - Reserved IPv6 Interface Identifiers
2433 * - XXX: already assigned to an address on the device
2434 */
2435
2436 /* Subnet-router anycast: 0000:0000:0000:0000 */
2437 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2438 goto regen;
2439
2440 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2441 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2442 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2443 */
2444 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2445 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2446 goto regen;
2447
2448 /* Reserved subnet anycast addresses */
2449 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2450 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2451 goto regen;
2452}
2453
2454/*
2455 * Add prefix route.
2456 */
2457
2458static void
2459addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2460 struct net_device *dev, unsigned long expires,
2461 u32 flags, gfp_t gfp_flags)
2462{
2463 struct fib6_config cfg = {
2464 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2465 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2466 .fc_ifindex = dev->ifindex,
2467 .fc_expires = expires,
2468 .fc_dst_len = plen,
2469 .fc_flags = RTF_UP | flags,
2470 .fc_nlinfo.nl_net = dev_net(dev),
2471 .fc_protocol = RTPROT_KERNEL,
2472 .fc_type = RTN_UNICAST,
2473 };
2474
2475 cfg.fc_dst = *pfx;
2476
2477 /* Prevent useless cloning on PtP SIT.
2478 This thing is done here expecting that the whole
2479 class of non-broadcast devices need not cloning.
2480 */
2481#if IS_ENABLED(CONFIG_IPV6_SIT)
2482 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2483 cfg.fc_flags |= RTF_NONEXTHOP;
2484#endif
2485
2486 ip6_route_add(&cfg, gfp_flags, NULL);
2487}
2488
2489
2490static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2491 int plen,
2492 const struct net_device *dev,
2493 u32 flags, u32 noflags,
2494 bool no_gw)
2495{
2496 struct fib6_node *fn;
2497 struct fib6_info *rt = NULL;
2498 struct fib6_table *table;
2499 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2500
2501 table = fib6_get_table(dev_net(dev), tb_id);
2502 if (!table)
2503 return NULL;
2504
2505 rcu_read_lock();
2506 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2507 if (!fn)
2508 goto out;
2509
2510 for_each_fib6_node_rt_rcu(fn) {
2511 /* prefix routes only use builtin fib6_nh */
2512 if (rt->nh)
2513 continue;
2514
2515 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2516 continue;
2517 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2518 continue;
2519 if ((rt->fib6_flags & flags) != flags)
2520 continue;
2521 if ((rt->fib6_flags & noflags) != 0)
2522 continue;
2523 if (!fib6_info_hold_safe(rt))
2524 continue;
2525 break;
2526 }
2527out:
2528 rcu_read_unlock();
2529 return rt;
2530}
2531
2532
2533/* Create "default" multicast route to the interface */
2534
2535static void addrconf_add_mroute(struct net_device *dev)
2536{
2537 struct fib6_config cfg = {
2538 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2539 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2540 .fc_ifindex = dev->ifindex,
2541 .fc_dst_len = 8,
2542 .fc_flags = RTF_UP,
2543 .fc_type = RTN_MULTICAST,
2544 .fc_nlinfo.nl_net = dev_net(dev),
2545 .fc_protocol = RTPROT_KERNEL,
2546 };
2547
2548 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2549
2550 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2551}
2552
2553static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2554{
2555 struct inet6_dev *idev;
2556
2557 ASSERT_RTNL();
2558
2559 idev = ipv6_find_idev(dev);
2560 if (IS_ERR(idev))
2561 return idev;
2562
2563 if (idev->cnf.disable_ipv6)
2564 return ERR_PTR(-EACCES);
2565
2566 /* Add default multicast route */
2567 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2568 addrconf_add_mroute(dev);
2569
2570 return idev;
2571}
2572
2573static void delete_tempaddrs(struct inet6_dev *idev,
2574 struct inet6_ifaddr *ifp)
2575{
2576 struct inet6_ifaddr *ift, *tmp;
2577
2578 write_lock_bh(&idev->lock);
2579 list_for_each_entry_safe(ift, tmp, &idev->tempaddr_list, tmp_list) {
2580 if (ift->ifpub != ifp)
2581 continue;
2582
2583 in6_ifa_hold(ift);
2584 write_unlock_bh(&idev->lock);
2585 ipv6_del_addr(ift);
2586 write_lock_bh(&idev->lock);
2587 }
2588 write_unlock_bh(&idev->lock);
2589}
2590
2591static void manage_tempaddrs(struct inet6_dev *idev,
2592 struct inet6_ifaddr *ifp,
2593 __u32 valid_lft, __u32 prefered_lft,
2594 bool create, unsigned long now)
2595{
2596 u32 flags;
2597 struct inet6_ifaddr *ift;
2598
2599 read_lock_bh(&idev->lock);
2600 /* update all temporary addresses in the list */
2601 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2602 int age, max_valid, max_prefered;
2603
2604 if (ifp != ift->ifpub)
2605 continue;
2606
2607 /* RFC 4941 section 3.3:
2608 * If a received option will extend the lifetime of a public
2609 * address, the lifetimes of temporary addresses should
2610 * be extended, subject to the overall constraint that no
2611 * temporary addresses should ever remain "valid" or "preferred"
2612 * for a time longer than (TEMP_VALID_LIFETIME) or
2613 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2614 */
2615 age = (now - ift->cstamp) / HZ;
2616 max_valid = READ_ONCE(idev->cnf.temp_valid_lft) - age;
2617 if (max_valid < 0)
2618 max_valid = 0;
2619
2620 max_prefered = READ_ONCE(idev->cnf.temp_prefered_lft) -
2621 idev->desync_factor - age;
2622 if (max_prefered < 0)
2623 max_prefered = 0;
2624
2625 if (valid_lft > max_valid)
2626 valid_lft = max_valid;
2627
2628 if (prefered_lft > max_prefered)
2629 prefered_lft = max_prefered;
2630
2631 spin_lock(&ift->lock);
2632 flags = ift->flags;
2633 ift->valid_lft = valid_lft;
2634 ift->prefered_lft = prefered_lft;
2635 ift->tstamp = now;
2636 if (prefered_lft > 0)
2637 ift->flags &= ~IFA_F_DEPRECATED;
2638
2639 spin_unlock(&ift->lock);
2640 if (!(flags&IFA_F_TENTATIVE))
2641 ipv6_ifa_notify(0, ift);
2642 }
2643
2644 /* Also create a temporary address if it's enabled but no temporary
2645 * address currently exists.
2646 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false
2647 * as part of cleanup (ie. deleting the mngtmpaddr).
2648 * We don't want that to result in creating a new temporary ip address.
2649 */
2650 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft))
2651 create = true;
2652
2653 if (create && READ_ONCE(idev->cnf.use_tempaddr) > 0) {
2654 /* When a new public address is created as described
2655 * in [ADDRCONF], also create a new temporary address.
2656 */
2657 read_unlock_bh(&idev->lock);
2658 ipv6_create_tempaddr(ifp, false);
2659 } else {
2660 read_unlock_bh(&idev->lock);
2661 }
2662}
2663
2664static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2665{
2666 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2667 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2668}
2669
2670int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2671 const struct prefix_info *pinfo,
2672 struct inet6_dev *in6_dev,
2673 const struct in6_addr *addr, int addr_type,
2674 u32 addr_flags, bool sllao, bool tokenized,
2675 __u32 valid_lft, u32 prefered_lft)
2676{
2677 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2678 int create = 0, update_lft = 0;
2679
2680 if (!ifp && valid_lft) {
2681 int max_addresses = READ_ONCE(in6_dev->cnf.max_addresses);
2682 struct ifa6_config cfg = {
2683 .pfx = addr,
2684 .plen = pinfo->prefix_len,
2685 .ifa_flags = addr_flags,
2686 .valid_lft = valid_lft,
2687 .preferred_lft = prefered_lft,
2688 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2689 .ifa_proto = IFAPROT_KERNEL_RA
2690 };
2691
2692#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2693 if ((READ_ONCE(net->ipv6.devconf_all->optimistic_dad) ||
2694 READ_ONCE(in6_dev->cnf.optimistic_dad)) &&
2695 !net->ipv6.devconf_all->forwarding && sllao)
2696 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2697#endif
2698
2699 /* Do not allow to create too much of autoconfigured
2700 * addresses; this would be too easy way to crash kernel.
2701 */
2702 if (!max_addresses ||
2703 ipv6_count_addresses(in6_dev) < max_addresses)
2704 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2705
2706 if (IS_ERR_OR_NULL(ifp))
2707 return -1;
2708
2709 create = 1;
2710 spin_lock_bh(&ifp->lock);
2711 ifp->flags |= IFA_F_MANAGETEMPADDR;
2712 ifp->cstamp = jiffies;
2713 ifp->tokenized = tokenized;
2714 spin_unlock_bh(&ifp->lock);
2715 addrconf_dad_start(ifp);
2716 }
2717
2718 if (ifp) {
2719 u32 flags;
2720 unsigned long now;
2721 u32 stored_lft;
2722
2723 /* update lifetime (RFC2462 5.5.3 e) */
2724 spin_lock_bh(&ifp->lock);
2725 now = jiffies;
2726 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2727 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2728 else
2729 stored_lft = 0;
2730
2731 /* RFC4862 Section 5.5.3e:
2732 * "Note that the preferred lifetime of the
2733 * corresponding address is always reset to
2734 * the Preferred Lifetime in the received
2735 * Prefix Information option, regardless of
2736 * whether the valid lifetime is also reset or
2737 * ignored."
2738 *
2739 * So we should always update prefered_lft here.
2740 */
2741 update_lft = !create && stored_lft;
2742
2743 if (update_lft && !READ_ONCE(in6_dev->cnf.ra_honor_pio_life)) {
2744 const u32 minimum_lft = min_t(u32,
2745 stored_lft, MIN_VALID_LIFETIME);
2746 valid_lft = max(valid_lft, minimum_lft);
2747 }
2748
2749 if (update_lft) {
2750 ifp->valid_lft = valid_lft;
2751 ifp->prefered_lft = prefered_lft;
2752 WRITE_ONCE(ifp->tstamp, now);
2753 flags = ifp->flags;
2754 ifp->flags &= ~IFA_F_DEPRECATED;
2755 spin_unlock_bh(&ifp->lock);
2756
2757 if (!(flags&IFA_F_TENTATIVE))
2758 ipv6_ifa_notify(0, ifp);
2759 } else
2760 spin_unlock_bh(&ifp->lock);
2761
2762 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2763 create, now);
2764
2765 in6_ifa_put(ifp);
2766 addrconf_verify(net);
2767 }
2768
2769 return 0;
2770}
2771EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2772
2773void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2774{
2775 struct prefix_info *pinfo;
2776 struct fib6_table *table;
2777 __u32 valid_lft;
2778 __u32 prefered_lft;
2779 int addr_type, err;
2780 u32 addr_flags = 0;
2781 struct inet6_dev *in6_dev;
2782 struct net *net = dev_net(dev);
2783 bool ignore_autoconf = false;
2784
2785 pinfo = (struct prefix_info *) opt;
2786
2787 if (len < sizeof(struct prefix_info)) {
2788 netdev_dbg(dev, "addrconf: prefix option too short\n");
2789 return;
2790 }
2791
2792 /*
2793 * Validation checks ([ADDRCONF], page 19)
2794 */
2795
2796 addr_type = ipv6_addr_type(&pinfo->prefix);
2797
2798 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2799 return;
2800
2801 valid_lft = ntohl(pinfo->valid);
2802 prefered_lft = ntohl(pinfo->prefered);
2803
2804 if (prefered_lft > valid_lft) {
2805 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2806 return;
2807 }
2808
2809 in6_dev = in6_dev_get(dev);
2810
2811 if (!in6_dev) {
2812 net_dbg_ratelimited("addrconf: device %s not configured\n",
2813 dev->name);
2814 return;
2815 }
2816
2817 if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft)
2818 goto put;
2819
2820 /*
2821 * Two things going on here:
2822 * 1) Add routes for on-link prefixes
2823 * 2) Configure prefixes with the auto flag set
2824 */
2825
2826 if (pinfo->onlink) {
2827 struct fib6_info *rt;
2828 unsigned long rt_expires;
2829
2830 /* Avoid arithmetic overflow. Really, we could
2831 * save rt_expires in seconds, likely valid_lft,
2832 * but it would require division in fib gc, that it
2833 * not good.
2834 */
2835 if (HZ > USER_HZ)
2836 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2837 else
2838 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2839
2840 if (addrconf_finite_timeout(rt_expires))
2841 rt_expires *= HZ;
2842
2843 rt = addrconf_get_prefix_route(&pinfo->prefix,
2844 pinfo->prefix_len,
2845 dev,
2846 RTF_ADDRCONF | RTF_PREFIX_RT,
2847 RTF_DEFAULT, true);
2848
2849 if (rt) {
2850 /* Autoconf prefix route */
2851 if (valid_lft == 0) {
2852 ip6_del_rt(net, rt, false);
2853 rt = NULL;
2854 } else {
2855 table = rt->fib6_table;
2856 spin_lock_bh(&table->tb6_lock);
2857
2858 if (addrconf_finite_timeout(rt_expires)) {
2859 /* not infinity */
2860 fib6_set_expires(rt, jiffies + rt_expires);
2861 fib6_add_gc_list(rt);
2862 } else {
2863 fib6_clean_expires(rt);
2864 fib6_remove_gc_list(rt);
2865 }
2866
2867 spin_unlock_bh(&table->tb6_lock);
2868 }
2869 } else if (valid_lft) {
2870 clock_t expires = 0;
2871 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2872 if (addrconf_finite_timeout(rt_expires)) {
2873 /* not infinity */
2874 flags |= RTF_EXPIRES;
2875 expires = jiffies_to_clock_t(rt_expires);
2876 }
2877 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2878 0, dev, expires, flags,
2879 GFP_ATOMIC);
2880 }
2881 fib6_info_release(rt);
2882 }
2883
2884 /* Try to figure out our local address for this prefix */
2885
2886 ignore_autoconf = READ_ONCE(in6_dev->cnf.ra_honor_pio_pflag) && pinfo->preferpd;
2887 if (pinfo->autoconf && in6_dev->cnf.autoconf && !ignore_autoconf) {
2888 struct in6_addr addr;
2889 bool tokenized = false, dev_addr_generated = false;
2890
2891 if (pinfo->prefix_len == 64) {
2892 memcpy(&addr, &pinfo->prefix, 8);
2893
2894 if (!ipv6_addr_any(&in6_dev->token)) {
2895 read_lock_bh(&in6_dev->lock);
2896 memcpy(addr.s6_addr + 8,
2897 in6_dev->token.s6_addr + 8, 8);
2898 read_unlock_bh(&in6_dev->lock);
2899 tokenized = true;
2900 } else if (is_addr_mode_generate_stable(in6_dev) &&
2901 !ipv6_generate_stable_address(&addr, 0,
2902 in6_dev)) {
2903 addr_flags |= IFA_F_STABLE_PRIVACY;
2904 goto ok;
2905 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2906 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2907 goto put;
2908 } else {
2909 dev_addr_generated = true;
2910 }
2911 goto ok;
2912 }
2913 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2914 pinfo->prefix_len);
2915 goto put;
2916
2917ok:
2918 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2919 &addr, addr_type,
2920 addr_flags, sllao,
2921 tokenized, valid_lft,
2922 prefered_lft);
2923 if (err)
2924 goto put;
2925
2926 /* Ignore error case here because previous prefix add addr was
2927 * successful which will be notified.
2928 */
2929 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2930 addr_type, addr_flags, sllao,
2931 tokenized, valid_lft,
2932 prefered_lft,
2933 dev_addr_generated);
2934 }
2935 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2936put:
2937 in6_dev_put(in6_dev);
2938}
2939
2940static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2941 struct in6_ifreq *ireq)
2942{
2943 struct ip_tunnel_parm_kern p = { };
2944 int err;
2945
2946 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2947 return -EADDRNOTAVAIL;
2948
2949 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2950 p.iph.version = 4;
2951 p.iph.ihl = 5;
2952 p.iph.protocol = IPPROTO_IPV6;
2953 p.iph.ttl = 64;
2954
2955 if (!dev->netdev_ops->ndo_tunnel_ctl)
2956 return -EOPNOTSUPP;
2957 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2958 if (err)
2959 return err;
2960
2961 dev = __dev_get_by_name(net, p.name);
2962 if (!dev)
2963 return -ENOBUFS;
2964 return dev_open(dev, NULL);
2965}
2966
2967/*
2968 * Set destination address.
2969 * Special case for SIT interfaces where we create a new "virtual"
2970 * device.
2971 */
2972int addrconf_set_dstaddr(struct net *net, void __user *arg)
2973{
2974 struct net_device *dev;
2975 struct in6_ifreq ireq;
2976 int err = -ENODEV;
2977
2978 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2979 return -ENODEV;
2980 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2981 return -EFAULT;
2982
2983 rtnl_lock();
2984 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2985 if (dev && dev->type == ARPHRD_SIT)
2986 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2987 rtnl_unlock();
2988 return err;
2989}
2990
2991static int ipv6_mc_config(struct sock *sk, bool join,
2992 const struct in6_addr *addr, int ifindex)
2993{
2994 int ret;
2995
2996 ASSERT_RTNL();
2997
2998 lock_sock(sk);
2999 if (join)
3000 ret = ipv6_sock_mc_join(sk, ifindex, addr);
3001 else
3002 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
3003 release_sock(sk);
3004
3005 return ret;
3006}
3007
3008/*
3009 * Manual configuration of address on an interface
3010 */
3011static int inet6_addr_add(struct net *net, int ifindex,
3012 struct ifa6_config *cfg,
3013 struct netlink_ext_ack *extack)
3014{
3015 struct inet6_ifaddr *ifp;
3016 struct inet6_dev *idev;
3017 struct net_device *dev;
3018 unsigned long timeout;
3019 clock_t expires;
3020 u32 flags;
3021
3022 ASSERT_RTNL();
3023
3024 if (cfg->plen > 128) {
3025 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
3026 return -EINVAL;
3027 }
3028
3029 /* check the lifetime */
3030 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) {
3031 NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid");
3032 return -EINVAL;
3033 }
3034
3035 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) {
3036 NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64");
3037 return -EINVAL;
3038 }
3039
3040 dev = __dev_get_by_index(net, ifindex);
3041 if (!dev)
3042 return -ENODEV;
3043
3044 idev = addrconf_add_dev(dev);
3045 if (IS_ERR(idev)) {
3046 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
3047 return PTR_ERR(idev);
3048 }
3049
3050 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3051 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3052 true, cfg->pfx, ifindex);
3053
3054 if (ret < 0) {
3055 NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed");
3056 return ret;
3057 }
3058 }
3059
3060 cfg->scope = ipv6_addr_scope(cfg->pfx);
3061
3062 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
3063 if (addrconf_finite_timeout(timeout)) {
3064 expires = jiffies_to_clock_t(timeout * HZ);
3065 cfg->valid_lft = timeout;
3066 flags = RTF_EXPIRES;
3067 } else {
3068 expires = 0;
3069 flags = 0;
3070 cfg->ifa_flags |= IFA_F_PERMANENT;
3071 }
3072
3073 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
3074 if (addrconf_finite_timeout(timeout)) {
3075 if (timeout == 0)
3076 cfg->ifa_flags |= IFA_F_DEPRECATED;
3077 cfg->preferred_lft = timeout;
3078 }
3079
3080 ifp = ipv6_add_addr(idev, cfg, true, extack);
3081 if (!IS_ERR(ifp)) {
3082 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
3083 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3084 ifp->rt_priority, dev, expires,
3085 flags, GFP_KERNEL);
3086 }
3087
3088 /* Send a netlink notification if DAD is enabled and
3089 * optimistic flag is not set
3090 */
3091 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
3092 ipv6_ifa_notify(0, ifp);
3093 /*
3094 * Note that section 3.1 of RFC 4429 indicates
3095 * that the Optimistic flag should not be set for
3096 * manually configured addresses
3097 */
3098 addrconf_dad_start(ifp);
3099 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
3100 manage_tempaddrs(idev, ifp, cfg->valid_lft,
3101 cfg->preferred_lft, true, jiffies);
3102 in6_ifa_put(ifp);
3103 addrconf_verify_rtnl(net);
3104 return 0;
3105 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3106 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
3107 cfg->pfx, ifindex);
3108 }
3109
3110 return PTR_ERR(ifp);
3111}
3112
3113static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3114 const struct in6_addr *pfx, unsigned int plen,
3115 struct netlink_ext_ack *extack)
3116{
3117 struct inet6_ifaddr *ifp;
3118 struct inet6_dev *idev;
3119 struct net_device *dev;
3120
3121 if (plen > 128) {
3122 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
3123 return -EINVAL;
3124 }
3125
3126 dev = __dev_get_by_index(net, ifindex);
3127 if (!dev) {
3128 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
3129 return -ENODEV;
3130 }
3131
3132 idev = __in6_dev_get(dev);
3133 if (!idev) {
3134 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
3135 return -ENXIO;
3136 }
3137
3138 read_lock_bh(&idev->lock);
3139 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3140 if (ifp->prefix_len == plen &&
3141 ipv6_addr_equal(pfx, &ifp->addr)) {
3142 in6_ifa_hold(ifp);
3143 read_unlock_bh(&idev->lock);
3144
3145 ipv6_del_addr(ifp);
3146
3147 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3148 (ifp->flags & IFA_F_MANAGETEMPADDR))
3149 delete_tempaddrs(idev, ifp);
3150
3151 addrconf_verify_rtnl(net);
3152 if (ipv6_addr_is_multicast(pfx)) {
3153 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3154 false, pfx, dev->ifindex);
3155 }
3156 return 0;
3157 }
3158 }
3159 read_unlock_bh(&idev->lock);
3160
3161 NL_SET_ERR_MSG_MOD(extack, "address not found");
3162 return -EADDRNOTAVAIL;
3163}
3164
3165
3166int addrconf_add_ifaddr(struct net *net, void __user *arg)
3167{
3168 struct ifa6_config cfg = {
3169 .ifa_flags = IFA_F_PERMANENT,
3170 .preferred_lft = INFINITY_LIFE_TIME,
3171 .valid_lft = INFINITY_LIFE_TIME,
3172 };
3173 struct in6_ifreq ireq;
3174 int err;
3175
3176 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3177 return -EPERM;
3178
3179 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3180 return -EFAULT;
3181
3182 cfg.pfx = &ireq.ifr6_addr;
3183 cfg.plen = ireq.ifr6_prefixlen;
3184
3185 rtnl_lock();
3186 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3187 rtnl_unlock();
3188 return err;
3189}
3190
3191int addrconf_del_ifaddr(struct net *net, void __user *arg)
3192{
3193 struct in6_ifreq ireq;
3194 int err;
3195
3196 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3197 return -EPERM;
3198
3199 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3200 return -EFAULT;
3201
3202 rtnl_lock();
3203 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3204 ireq.ifr6_prefixlen, NULL);
3205 rtnl_unlock();
3206 return err;
3207}
3208
3209static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3210 int plen, int scope, u8 proto)
3211{
3212 struct inet6_ifaddr *ifp;
3213 struct ifa6_config cfg = {
3214 .pfx = addr,
3215 .plen = plen,
3216 .ifa_flags = IFA_F_PERMANENT,
3217 .valid_lft = INFINITY_LIFE_TIME,
3218 .preferred_lft = INFINITY_LIFE_TIME,
3219 .scope = scope,
3220 .ifa_proto = proto
3221 };
3222
3223 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3224 if (!IS_ERR(ifp)) {
3225 spin_lock_bh(&ifp->lock);
3226 ifp->flags &= ~IFA_F_TENTATIVE;
3227 spin_unlock_bh(&ifp->lock);
3228 rt_genid_bump_ipv6(dev_net(idev->dev));
3229 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3230 in6_ifa_put(ifp);
3231 }
3232}
3233
3234#if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3235static void add_v4_addrs(struct inet6_dev *idev)
3236{
3237 struct in6_addr addr;
3238 struct net_device *dev;
3239 struct net *net = dev_net(idev->dev);
3240 int scope, plen, offset = 0;
3241 u32 pflags = 0;
3242
3243 ASSERT_RTNL();
3244
3245 memset(&addr, 0, sizeof(struct in6_addr));
3246 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */
3247 if (idev->dev->addr_len == sizeof(struct in6_addr))
3248 offset = sizeof(struct in6_addr) - 4;
3249 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
3250
3251 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) {
3252 scope = IPV6_ADDR_COMPATv4;
3253 plen = 96;
3254 pflags |= RTF_NONEXTHOP;
3255 } else {
3256 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3257 return;
3258
3259 addr.s6_addr32[0] = htonl(0xfe800000);
3260 scope = IFA_LINK;
3261 plen = 64;
3262 }
3263
3264 if (addr.s6_addr32[3]) {
3265 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC);
3266 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3267 GFP_KERNEL);
3268 return;
3269 }
3270
3271 for_each_netdev(net, dev) {
3272 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3273 if (in_dev && (dev->flags & IFF_UP)) {
3274 struct in_ifaddr *ifa;
3275 int flag = scope;
3276
3277 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3278 addr.s6_addr32[3] = ifa->ifa_local;
3279
3280 if (ifa->ifa_scope == RT_SCOPE_LINK)
3281 continue;
3282 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3283 if (idev->dev->flags&IFF_POINTOPOINT)
3284 continue;
3285 flag |= IFA_HOST;
3286 }
3287
3288 add_addr(idev, &addr, plen, flag,
3289 IFAPROT_UNSPEC);
3290 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3291 0, pflags, GFP_KERNEL);
3292 }
3293 }
3294 }
3295}
3296#endif
3297
3298static void init_loopback(struct net_device *dev)
3299{
3300 struct inet6_dev *idev;
3301
3302 /* ::1 */
3303
3304 ASSERT_RTNL();
3305
3306 idev = ipv6_find_idev(dev);
3307 if (IS_ERR(idev)) {
3308 pr_debug("%s: add_dev failed\n", __func__);
3309 return;
3310 }
3311
3312 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO);
3313}
3314
3315void addrconf_add_linklocal(struct inet6_dev *idev,
3316 const struct in6_addr *addr, u32 flags)
3317{
3318 struct ifa6_config cfg = {
3319 .pfx = addr,
3320 .plen = 64,
3321 .ifa_flags = flags | IFA_F_PERMANENT,
3322 .valid_lft = INFINITY_LIFE_TIME,
3323 .preferred_lft = INFINITY_LIFE_TIME,
3324 .scope = IFA_LINK,
3325 .ifa_proto = IFAPROT_KERNEL_LL
3326 };
3327 struct inet6_ifaddr *ifp;
3328
3329#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3330 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad) ||
3331 READ_ONCE(idev->cnf.optimistic_dad)) &&
3332 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3333 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3334#endif
3335
3336 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3337 if (!IS_ERR(ifp)) {
3338 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3339 0, 0, GFP_ATOMIC);
3340 addrconf_dad_start(ifp);
3341 in6_ifa_put(ifp);
3342 }
3343}
3344EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3345
3346static bool ipv6_reserved_interfaceid(struct in6_addr address)
3347{
3348 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3349 return true;
3350
3351 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3352 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3353 return true;
3354
3355 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3356 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3357 return true;
3358
3359 return false;
3360}
3361
3362static int ipv6_generate_stable_address(struct in6_addr *address,
3363 u8 dad_count,
3364 const struct inet6_dev *idev)
3365{
3366 static DEFINE_SPINLOCK(lock);
3367 static __u32 digest[SHA1_DIGEST_WORDS];
3368 static __u32 workspace[SHA1_WORKSPACE_WORDS];
3369
3370 static union {
3371 char __data[SHA1_BLOCK_SIZE];
3372 struct {
3373 struct in6_addr secret;
3374 __be32 prefix[2];
3375 unsigned char hwaddr[MAX_ADDR_LEN];
3376 u8 dad_count;
3377 } __packed;
3378 } data;
3379
3380 struct in6_addr secret;
3381 struct in6_addr temp;
3382 struct net *net = dev_net(idev->dev);
3383
3384 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3385
3386 if (idev->cnf.stable_secret.initialized)
3387 secret = idev->cnf.stable_secret.secret;
3388 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3389 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3390 else
3391 return -1;
3392
3393retry:
3394 spin_lock_bh(&lock);
3395
3396 sha1_init(digest);
3397 memset(&data, 0, sizeof(data));
3398 memset(workspace, 0, sizeof(workspace));
3399 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3400 data.prefix[0] = address->s6_addr32[0];
3401 data.prefix[1] = address->s6_addr32[1];
3402 data.secret = secret;
3403 data.dad_count = dad_count;
3404
3405 sha1_transform(digest, data.__data, workspace);
3406
3407 temp = *address;
3408 temp.s6_addr32[2] = (__force __be32)digest[0];
3409 temp.s6_addr32[3] = (__force __be32)digest[1];
3410
3411 spin_unlock_bh(&lock);
3412
3413 if (ipv6_reserved_interfaceid(temp)) {
3414 dad_count++;
3415 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3416 return -1;
3417 goto retry;
3418 }
3419
3420 *address = temp;
3421 return 0;
3422}
3423
3424static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3425{
3426 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3427
3428 if (s->initialized)
3429 return;
3430 s = &idev->cnf.stable_secret;
3431 get_random_bytes(&s->secret, sizeof(s->secret));
3432 s->initialized = true;
3433}
3434
3435static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3436{
3437 struct in6_addr addr;
3438
3439 /* no link local addresses on L3 master devices */
3440 if (netif_is_l3_master(idev->dev))
3441 return;
3442
3443 /* no link local addresses on devices flagged as slaves */
3444 if (idev->dev->priv_flags & IFF_NO_ADDRCONF)
3445 return;
3446
3447 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3448
3449 switch (idev->cnf.addr_gen_mode) {
3450 case IN6_ADDR_GEN_MODE_RANDOM:
3451 ipv6_gen_mode_random_init(idev);
3452 fallthrough;
3453 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3454 if (!ipv6_generate_stable_address(&addr, 0, idev))
3455 addrconf_add_linklocal(idev, &addr,
3456 IFA_F_STABLE_PRIVACY);
3457 else if (prefix_route)
3458 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3459 0, 0, GFP_KERNEL);
3460 break;
3461 case IN6_ADDR_GEN_MODE_EUI64:
3462 /* addrconf_add_linklocal also adds a prefix_route and we
3463 * only need to care about prefix routes if ipv6_generate_eui64
3464 * couldn't generate one.
3465 */
3466 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3467 addrconf_add_linklocal(idev, &addr, 0);
3468 else if (prefix_route)
3469 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3470 0, 0, GFP_KERNEL);
3471 break;
3472 case IN6_ADDR_GEN_MODE_NONE:
3473 default:
3474 /* will not add any link local address */
3475 break;
3476 }
3477}
3478
3479static void addrconf_dev_config(struct net_device *dev)
3480{
3481 struct inet6_dev *idev;
3482
3483 ASSERT_RTNL();
3484
3485 if ((dev->type != ARPHRD_ETHER) &&
3486 (dev->type != ARPHRD_FDDI) &&
3487 (dev->type != ARPHRD_ARCNET) &&
3488 (dev->type != ARPHRD_INFINIBAND) &&
3489 (dev->type != ARPHRD_IEEE1394) &&
3490 (dev->type != ARPHRD_TUNNEL6) &&
3491 (dev->type != ARPHRD_6LOWPAN) &&
3492 (dev->type != ARPHRD_TUNNEL) &&
3493 (dev->type != ARPHRD_NONE) &&
3494 (dev->type != ARPHRD_RAWIP)) {
3495 /* Alas, we support only Ethernet autoconfiguration. */
3496 idev = __in6_dev_get(dev);
3497 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3498 dev->flags & IFF_MULTICAST)
3499 ipv6_mc_up(idev);
3500 return;
3501 }
3502
3503 idev = addrconf_add_dev(dev);
3504 if (IS_ERR(idev))
3505 return;
3506
3507 /* this device type has no EUI support */
3508 if (dev->type == ARPHRD_NONE &&
3509 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3510 WRITE_ONCE(idev->cnf.addr_gen_mode,
3511 IN6_ADDR_GEN_MODE_RANDOM);
3512
3513 addrconf_addr_gen(idev, false);
3514}
3515
3516#if IS_ENABLED(CONFIG_IPV6_SIT)
3517static void addrconf_sit_config(struct net_device *dev)
3518{
3519 struct inet6_dev *idev;
3520
3521 ASSERT_RTNL();
3522
3523 /*
3524 * Configure the tunnel with one of our IPv4
3525 * addresses... we should configure all of
3526 * our v4 addrs in the tunnel
3527 */
3528
3529 idev = ipv6_find_idev(dev);
3530 if (IS_ERR(idev)) {
3531 pr_debug("%s: add_dev failed\n", __func__);
3532 return;
3533 }
3534
3535 if (dev->priv_flags & IFF_ISATAP) {
3536 addrconf_addr_gen(idev, false);
3537 return;
3538 }
3539
3540 add_v4_addrs(idev);
3541
3542 if (dev->flags&IFF_POINTOPOINT)
3543 addrconf_add_mroute(dev);
3544}
3545#endif
3546
3547#if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3548static void addrconf_gre_config(struct net_device *dev)
3549{
3550 struct inet6_dev *idev;
3551
3552 ASSERT_RTNL();
3553
3554 idev = ipv6_find_idev(dev);
3555 if (IS_ERR(idev)) {
3556 pr_debug("%s: add_dev failed\n", __func__);
3557 return;
3558 }
3559
3560 if (dev->type == ARPHRD_ETHER) {
3561 addrconf_addr_gen(idev, true);
3562 return;
3563 }
3564
3565 add_v4_addrs(idev);
3566
3567 if (dev->flags & IFF_POINTOPOINT)
3568 addrconf_add_mroute(dev);
3569}
3570#endif
3571
3572static void addrconf_init_auto_addrs(struct net_device *dev)
3573{
3574 switch (dev->type) {
3575#if IS_ENABLED(CONFIG_IPV6_SIT)
3576 case ARPHRD_SIT:
3577 addrconf_sit_config(dev);
3578 break;
3579#endif
3580#if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3581 case ARPHRD_IP6GRE:
3582 case ARPHRD_IPGRE:
3583 addrconf_gre_config(dev);
3584 break;
3585#endif
3586 case ARPHRD_LOOPBACK:
3587 init_loopback(dev);
3588 break;
3589
3590 default:
3591 addrconf_dev_config(dev);
3592 break;
3593 }
3594}
3595
3596static int fixup_permanent_addr(struct net *net,
3597 struct inet6_dev *idev,
3598 struct inet6_ifaddr *ifp)
3599{
3600 /* !fib6_node means the host route was removed from the
3601 * FIB, for example, if 'lo' device is taken down. In that
3602 * case regenerate the host route.
3603 */
3604 if (!ifp->rt || !ifp->rt->fib6_node) {
3605 struct fib6_info *f6i, *prev;
3606
3607 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3608 GFP_ATOMIC, NULL);
3609 if (IS_ERR(f6i))
3610 return PTR_ERR(f6i);
3611
3612 /* ifp->rt can be accessed outside of rtnl */
3613 spin_lock(&ifp->lock);
3614 prev = ifp->rt;
3615 ifp->rt = f6i;
3616 spin_unlock(&ifp->lock);
3617
3618 fib6_info_release(prev);
3619 }
3620
3621 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3622 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3623 ifp->rt_priority, idev->dev, 0, 0,
3624 GFP_ATOMIC);
3625 }
3626
3627 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3628 addrconf_dad_start(ifp);
3629
3630 return 0;
3631}
3632
3633static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3634{
3635 struct inet6_ifaddr *ifp, *tmp;
3636 struct inet6_dev *idev;
3637
3638 idev = __in6_dev_get(dev);
3639 if (!idev)
3640 return;
3641
3642 write_lock_bh(&idev->lock);
3643
3644 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3645 if ((ifp->flags & IFA_F_PERMANENT) &&
3646 fixup_permanent_addr(net, idev, ifp) < 0) {
3647 write_unlock_bh(&idev->lock);
3648 in6_ifa_hold(ifp);
3649 ipv6_del_addr(ifp);
3650 write_lock_bh(&idev->lock);
3651
3652 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3653 idev->dev->name, &ifp->addr);
3654 }
3655 }
3656
3657 write_unlock_bh(&idev->lock);
3658}
3659
3660static int addrconf_notify(struct notifier_block *this, unsigned long event,
3661 void *ptr)
3662{
3663 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3664 struct netdev_notifier_change_info *change_info;
3665 struct netdev_notifier_changeupper_info *info;
3666 struct inet6_dev *idev = __in6_dev_get(dev);
3667 struct net *net = dev_net(dev);
3668 int run_pending = 0;
3669 int err;
3670
3671 switch (event) {
3672 case NETDEV_REGISTER:
3673 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3674 idev = ipv6_add_dev(dev);
3675 if (IS_ERR(idev))
3676 return notifier_from_errno(PTR_ERR(idev));
3677 }
3678 break;
3679
3680 case NETDEV_CHANGEMTU:
3681 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3682 if (dev->mtu < IPV6_MIN_MTU) {
3683 addrconf_ifdown(dev, dev != net->loopback_dev);
3684 break;
3685 }
3686
3687 if (idev) {
3688 rt6_mtu_change(dev, dev->mtu);
3689 WRITE_ONCE(idev->cnf.mtu6, dev->mtu);
3690 break;
3691 }
3692
3693 /* allocate new idev */
3694 idev = ipv6_add_dev(dev);
3695 if (IS_ERR(idev))
3696 break;
3697
3698 /* device is still not ready */
3699 if (!(idev->if_flags & IF_READY))
3700 break;
3701
3702 run_pending = 1;
3703 fallthrough;
3704 case NETDEV_UP:
3705 case NETDEV_CHANGE:
3706 if (idev && idev->cnf.disable_ipv6)
3707 break;
3708
3709 if (dev->priv_flags & IFF_NO_ADDRCONF) {
3710 if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) &&
3711 dev->flags & IFF_UP && dev->flags & IFF_MULTICAST)
3712 ipv6_mc_up(idev);
3713 break;
3714 }
3715
3716 if (event == NETDEV_UP) {
3717 /* restore routes for permanent addresses */
3718 addrconf_permanent_addr(net, dev);
3719
3720 if (!addrconf_link_ready(dev)) {
3721 /* device is not ready yet. */
3722 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3723 dev->name);
3724 break;
3725 }
3726
3727 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3728 idev = ipv6_add_dev(dev);
3729
3730 if (!IS_ERR_OR_NULL(idev)) {
3731 idev->if_flags |= IF_READY;
3732 run_pending = 1;
3733 }
3734 } else if (event == NETDEV_CHANGE) {
3735 if (!addrconf_link_ready(dev)) {
3736 /* device is still not ready. */
3737 rt6_sync_down_dev(dev, event);
3738 break;
3739 }
3740
3741 if (!IS_ERR_OR_NULL(idev)) {
3742 if (idev->if_flags & IF_READY) {
3743 /* device is already configured -
3744 * but resend MLD reports, we might
3745 * have roamed and need to update
3746 * multicast snooping switches
3747 */
3748 ipv6_mc_up(idev);
3749 change_info = ptr;
3750 if (change_info->flags_changed & IFF_NOARP)
3751 addrconf_dad_run(idev, true);
3752 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3753 break;
3754 }
3755 idev->if_flags |= IF_READY;
3756 }
3757
3758 pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3759 dev->name);
3760
3761 run_pending = 1;
3762 }
3763
3764 addrconf_init_auto_addrs(dev);
3765
3766 if (!IS_ERR_OR_NULL(idev)) {
3767 if (run_pending)
3768 addrconf_dad_run(idev, false);
3769
3770 /* Device has an address by now */
3771 rt6_sync_up(dev, RTNH_F_DEAD);
3772
3773 /*
3774 * If the MTU changed during the interface down,
3775 * when the interface up, the changed MTU must be
3776 * reflected in the idev as well as routers.
3777 */
3778 if (idev->cnf.mtu6 != dev->mtu &&
3779 dev->mtu >= IPV6_MIN_MTU) {
3780 rt6_mtu_change(dev, dev->mtu);
3781 WRITE_ONCE(idev->cnf.mtu6, dev->mtu);
3782 }
3783 WRITE_ONCE(idev->tstamp, jiffies);
3784 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3785
3786 /*
3787 * If the changed mtu during down is lower than
3788 * IPV6_MIN_MTU stop IPv6 on this interface.
3789 */
3790 if (dev->mtu < IPV6_MIN_MTU)
3791 addrconf_ifdown(dev, dev != net->loopback_dev);
3792 }
3793 break;
3794
3795 case NETDEV_DOWN:
3796 case NETDEV_UNREGISTER:
3797 /*
3798 * Remove all addresses from this interface.
3799 */
3800 addrconf_ifdown(dev, event != NETDEV_DOWN);
3801 break;
3802
3803 case NETDEV_CHANGENAME:
3804 if (idev) {
3805 snmp6_unregister_dev(idev);
3806 addrconf_sysctl_unregister(idev);
3807 err = addrconf_sysctl_register(idev);
3808 if (err)
3809 return notifier_from_errno(err);
3810 err = snmp6_register_dev(idev);
3811 if (err) {
3812 addrconf_sysctl_unregister(idev);
3813 return notifier_from_errno(err);
3814 }
3815 }
3816 break;
3817
3818 case NETDEV_PRE_TYPE_CHANGE:
3819 case NETDEV_POST_TYPE_CHANGE:
3820 if (idev)
3821 addrconf_type_change(dev, event);
3822 break;
3823
3824 case NETDEV_CHANGEUPPER:
3825 info = ptr;
3826
3827 /* flush all routes if dev is linked to or unlinked from
3828 * an L3 master device (e.g., VRF)
3829 */
3830 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3831 addrconf_ifdown(dev, false);
3832 }
3833
3834 return NOTIFY_OK;
3835}
3836
3837/*
3838 * addrconf module should be notified of a device going up
3839 */
3840static struct notifier_block ipv6_dev_notf = {
3841 .notifier_call = addrconf_notify,
3842 .priority = ADDRCONF_NOTIFY_PRIORITY,
3843};
3844
3845static void addrconf_type_change(struct net_device *dev, unsigned long event)
3846{
3847 struct inet6_dev *idev;
3848 ASSERT_RTNL();
3849
3850 idev = __in6_dev_get(dev);
3851
3852 if (event == NETDEV_POST_TYPE_CHANGE)
3853 ipv6_mc_remap(idev);
3854 else if (event == NETDEV_PRE_TYPE_CHANGE)
3855 ipv6_mc_unmap(idev);
3856}
3857
3858static bool addr_is_local(const struct in6_addr *addr)
3859{
3860 return ipv6_addr_type(addr) &
3861 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3862}
3863
3864static int addrconf_ifdown(struct net_device *dev, bool unregister)
3865{
3866 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3867 struct net *net = dev_net(dev);
3868 struct inet6_dev *idev;
3869 struct inet6_ifaddr *ifa;
3870 LIST_HEAD(tmp_addr_list);
3871 bool keep_addr = false;
3872 bool was_ready;
3873 int state, i;
3874
3875 ASSERT_RTNL();
3876
3877 rt6_disable_ip(dev, event);
3878
3879 idev = __in6_dev_get(dev);
3880 if (!idev)
3881 return -ENODEV;
3882
3883 /*
3884 * Step 1: remove reference to ipv6 device from parent device.
3885 * Do not dev_put!
3886 */
3887 if (unregister) {
3888 idev->dead = 1;
3889
3890 /* protected by rtnl_lock */
3891 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3892
3893 /* Step 1.5: remove snmp6 entry */
3894 snmp6_unregister_dev(idev);
3895
3896 }
3897
3898 /* combine the user config with event to determine if permanent
3899 * addresses are to be removed from address hash table
3900 */
3901 if (!unregister && !idev->cnf.disable_ipv6) {
3902 /* aggregate the system setting and interface setting */
3903 int _keep_addr = READ_ONCE(net->ipv6.devconf_all->keep_addr_on_down);
3904
3905 if (!_keep_addr)
3906 _keep_addr = READ_ONCE(idev->cnf.keep_addr_on_down);
3907
3908 keep_addr = (_keep_addr > 0);
3909 }
3910
3911 /* Step 2: clear hash table */
3912 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3913 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i];
3914
3915 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
3916restart:
3917 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3918 if (ifa->idev == idev) {
3919 addrconf_del_dad_work(ifa);
3920 /* combined flag + permanent flag decide if
3921 * address is retained on a down event
3922 */
3923 if (!keep_addr ||
3924 !(ifa->flags & IFA_F_PERMANENT) ||
3925 addr_is_local(&ifa->addr)) {
3926 hlist_del_init_rcu(&ifa->addr_lst);
3927 goto restart;
3928 }
3929 }
3930 }
3931 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
3932 }
3933
3934 write_lock_bh(&idev->lock);
3935
3936 addrconf_del_rs_timer(idev);
3937
3938 /* Step 2: clear flags for stateless addrconf, repeated down
3939 * detection
3940 */
3941 was_ready = idev->if_flags & IF_READY;
3942 if (!unregister)
3943 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3944
3945 /* Step 3: clear tempaddr list */
3946 while (!list_empty(&idev->tempaddr_list)) {
3947 ifa = list_first_entry(&idev->tempaddr_list,
3948 struct inet6_ifaddr, tmp_list);
3949 list_del(&ifa->tmp_list);
3950 write_unlock_bh(&idev->lock);
3951 spin_lock_bh(&ifa->lock);
3952
3953 if (ifa->ifpub) {
3954 in6_ifa_put(ifa->ifpub);
3955 ifa->ifpub = NULL;
3956 }
3957 spin_unlock_bh(&ifa->lock);
3958 in6_ifa_put(ifa);
3959 write_lock_bh(&idev->lock);
3960 }
3961
3962 list_for_each_entry(ifa, &idev->addr_list, if_list)
3963 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3964 write_unlock_bh(&idev->lock);
3965
3966 while (!list_empty(&tmp_addr_list)) {
3967 struct fib6_info *rt = NULL;
3968 bool keep;
3969
3970 ifa = list_first_entry(&tmp_addr_list,
3971 struct inet6_ifaddr, if_list_aux);
3972 list_del(&ifa->if_list_aux);
3973
3974 addrconf_del_dad_work(ifa);
3975
3976 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3977 !addr_is_local(&ifa->addr);
3978
3979 spin_lock_bh(&ifa->lock);
3980
3981 if (keep) {
3982 /* set state to skip the notifier below */
3983 state = INET6_IFADDR_STATE_DEAD;
3984 ifa->state = INET6_IFADDR_STATE_PREDAD;
3985 if (!(ifa->flags & IFA_F_NODAD))
3986 ifa->flags |= IFA_F_TENTATIVE;
3987
3988 rt = ifa->rt;
3989 ifa->rt = NULL;
3990 } else {
3991 state = ifa->state;
3992 ifa->state = INET6_IFADDR_STATE_DEAD;
3993 }
3994
3995 spin_unlock_bh(&ifa->lock);
3996
3997 if (rt)
3998 ip6_del_rt(net, rt, false);
3999
4000 if (state != INET6_IFADDR_STATE_DEAD) {
4001 __ipv6_ifa_notify(RTM_DELADDR, ifa);
4002 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
4003 } else {
4004 if (idev->cnf.forwarding)
4005 addrconf_leave_anycast(ifa);
4006 addrconf_leave_solict(ifa->idev, &ifa->addr);
4007 }
4008
4009 if (!keep) {
4010 write_lock_bh(&idev->lock);
4011 list_del_rcu(&ifa->if_list);
4012 write_unlock_bh(&idev->lock);
4013 in6_ifa_put(ifa);
4014 }
4015 }
4016
4017 /* Step 5: Discard anycast and multicast list */
4018 if (unregister) {
4019 ipv6_ac_destroy_dev(idev);
4020 ipv6_mc_destroy_dev(idev);
4021 } else if (was_ready) {
4022 ipv6_mc_down(idev);
4023 }
4024
4025 WRITE_ONCE(idev->tstamp, jiffies);
4026 idev->ra_mtu = 0;
4027
4028 /* Last: Shot the device (if unregistered) */
4029 if (unregister) {
4030 addrconf_sysctl_unregister(idev);
4031 neigh_parms_release(&nd_tbl, idev->nd_parms);
4032 neigh_ifdown(&nd_tbl, dev);
4033 in6_dev_put(idev);
4034 }
4035 return 0;
4036}
4037
4038static void addrconf_rs_timer(struct timer_list *t)
4039{
4040 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
4041 struct net_device *dev = idev->dev;
4042 struct in6_addr lladdr;
4043 int rtr_solicits;
4044
4045 write_lock(&idev->lock);
4046 if (idev->dead || !(idev->if_flags & IF_READY))
4047 goto out;
4048
4049 if (!ipv6_accept_ra(idev))
4050 goto out;
4051
4052 /* Announcement received after solicitation was sent */
4053 if (idev->if_flags & IF_RA_RCVD)
4054 goto out;
4055
4056 rtr_solicits = READ_ONCE(idev->cnf.rtr_solicits);
4057
4058 if (idev->rs_probes++ < rtr_solicits || rtr_solicits < 0) {
4059 write_unlock(&idev->lock);
4060 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4061 ndisc_send_rs(dev, &lladdr,
4062 &in6addr_linklocal_allrouters);
4063 else
4064 goto put;
4065
4066 write_lock(&idev->lock);
4067 idev->rs_interval = rfc3315_s14_backoff_update(
4068 idev->rs_interval,
4069 READ_ONCE(idev->cnf.rtr_solicit_max_interval));
4070 /* The wait after the last probe can be shorter */
4071 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
4072 READ_ONCE(idev->cnf.rtr_solicits)) ?
4073 READ_ONCE(idev->cnf.rtr_solicit_delay) :
4074 idev->rs_interval);
4075 } else {
4076 /*
4077 * Note: we do not support deprecated "all on-link"
4078 * assumption any longer.
4079 */
4080 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
4081 }
4082
4083out:
4084 write_unlock(&idev->lock);
4085put:
4086 in6_dev_put(idev);
4087}
4088
4089/*
4090 * Duplicate Address Detection
4091 */
4092static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
4093{
4094 struct inet6_dev *idev = ifp->idev;
4095 unsigned long rand_num;
4096 u64 nonce;
4097
4098 if (ifp->flags & IFA_F_OPTIMISTIC)
4099 rand_num = 0;
4100 else
4101 rand_num = get_random_u32_below(
4102 READ_ONCE(idev->cnf.rtr_solicit_delay) ? : 1);
4103
4104 nonce = 0;
4105 if (READ_ONCE(idev->cnf.enhanced_dad) ||
4106 READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad)) {
4107 do
4108 get_random_bytes(&nonce, 6);
4109 while (nonce == 0);
4110 }
4111 ifp->dad_nonce = nonce;
4112 ifp->dad_probes = READ_ONCE(idev->cnf.dad_transmits);
4113 addrconf_mod_dad_work(ifp, rand_num);
4114}
4115
4116static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
4117{
4118 struct inet6_dev *idev = ifp->idev;
4119 struct net_device *dev = idev->dev;
4120 bool bump_id, notify = false;
4121 struct net *net;
4122
4123 addrconf_join_solict(dev, &ifp->addr);
4124
4125 read_lock_bh(&idev->lock);
4126 spin_lock(&ifp->lock);
4127 if (ifp->state == INET6_IFADDR_STATE_DEAD)
4128 goto out;
4129
4130 net = dev_net(dev);
4131 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
4132 (READ_ONCE(net->ipv6.devconf_all->accept_dad) < 1 &&
4133 READ_ONCE(idev->cnf.accept_dad) < 1) ||
4134 !(ifp->flags&IFA_F_TENTATIVE) ||
4135 ifp->flags & IFA_F_NODAD) {
4136 bool send_na = false;
4137
4138 if (ifp->flags & IFA_F_TENTATIVE &&
4139 !(ifp->flags & IFA_F_OPTIMISTIC))
4140 send_na = true;
4141 bump_id = ifp->flags & IFA_F_TENTATIVE;
4142 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4143 spin_unlock(&ifp->lock);
4144 read_unlock_bh(&idev->lock);
4145
4146 addrconf_dad_completed(ifp, bump_id, send_na);
4147 return;
4148 }
4149
4150 if (!(idev->if_flags & IF_READY)) {
4151 spin_unlock(&ifp->lock);
4152 read_unlock_bh(&idev->lock);
4153 /*
4154 * If the device is not ready:
4155 * - keep it tentative if it is a permanent address.
4156 * - otherwise, kill it.
4157 */
4158 in6_ifa_hold(ifp);
4159 addrconf_dad_stop(ifp, 0);
4160 return;
4161 }
4162
4163 /*
4164 * Optimistic nodes can start receiving
4165 * Frames right away
4166 */
4167 if (ifp->flags & IFA_F_OPTIMISTIC) {
4168 ip6_ins_rt(net, ifp->rt);
4169 if (ipv6_use_optimistic_addr(net, idev)) {
4170 /* Because optimistic nodes can use this address,
4171 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4172 */
4173 notify = true;
4174 }
4175 }
4176
4177 addrconf_dad_kick(ifp);
4178out:
4179 spin_unlock(&ifp->lock);
4180 read_unlock_bh(&idev->lock);
4181 if (notify)
4182 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4183}
4184
4185static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4186{
4187 bool begin_dad = false;
4188
4189 spin_lock_bh(&ifp->lock);
4190 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4191 ifp->state = INET6_IFADDR_STATE_PREDAD;
4192 begin_dad = true;
4193 }
4194 spin_unlock_bh(&ifp->lock);
4195
4196 if (begin_dad)
4197 addrconf_mod_dad_work(ifp, 0);
4198}
4199
4200static void addrconf_dad_work(struct work_struct *w)
4201{
4202 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4203 struct inet6_ifaddr,
4204 dad_work);
4205 struct inet6_dev *idev = ifp->idev;
4206 bool bump_id, disable_ipv6 = false;
4207 struct in6_addr mcaddr;
4208
4209 enum {
4210 DAD_PROCESS,
4211 DAD_BEGIN,
4212 DAD_ABORT,
4213 } action = DAD_PROCESS;
4214
4215 rtnl_lock();
4216
4217 spin_lock_bh(&ifp->lock);
4218 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4219 action = DAD_BEGIN;
4220 ifp->state = INET6_IFADDR_STATE_DAD;
4221 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4222 action = DAD_ABORT;
4223 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4224
4225 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->accept_dad) > 1 ||
4226 READ_ONCE(idev->cnf.accept_dad) > 1) &&
4227 !idev->cnf.disable_ipv6 &&
4228 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4229 struct in6_addr addr;
4230
4231 addr.s6_addr32[0] = htonl(0xfe800000);
4232 addr.s6_addr32[1] = 0;
4233
4234 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4235 ipv6_addr_equal(&ifp->addr, &addr)) {
4236 /* DAD failed for link-local based on MAC */
4237 WRITE_ONCE(idev->cnf.disable_ipv6, 1);
4238
4239 pr_info("%s: IPv6 being disabled!\n",
4240 ifp->idev->dev->name);
4241 disable_ipv6 = true;
4242 }
4243 }
4244 }
4245 spin_unlock_bh(&ifp->lock);
4246
4247 if (action == DAD_BEGIN) {
4248 addrconf_dad_begin(ifp);
4249 goto out;
4250 } else if (action == DAD_ABORT) {
4251 in6_ifa_hold(ifp);
4252 addrconf_dad_stop(ifp, 1);
4253 if (disable_ipv6)
4254 addrconf_ifdown(idev->dev, false);
4255 goto out;
4256 }
4257
4258 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4259 goto out;
4260
4261 write_lock_bh(&idev->lock);
4262 if (idev->dead || !(idev->if_flags & IF_READY)) {
4263 write_unlock_bh(&idev->lock);
4264 goto out;
4265 }
4266
4267 spin_lock(&ifp->lock);
4268 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4269 spin_unlock(&ifp->lock);
4270 write_unlock_bh(&idev->lock);
4271 goto out;
4272 }
4273
4274 if (ifp->dad_probes == 0) {
4275 bool send_na = false;
4276
4277 /*
4278 * DAD was successful
4279 */
4280
4281 if (ifp->flags & IFA_F_TENTATIVE &&
4282 !(ifp->flags & IFA_F_OPTIMISTIC))
4283 send_na = true;
4284 bump_id = ifp->flags & IFA_F_TENTATIVE;
4285 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4286 spin_unlock(&ifp->lock);
4287 write_unlock_bh(&idev->lock);
4288
4289 addrconf_dad_completed(ifp, bump_id, send_na);
4290
4291 goto out;
4292 }
4293
4294 ifp->dad_probes--;
4295 addrconf_mod_dad_work(ifp,
4296 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4297 HZ/100));
4298 spin_unlock(&ifp->lock);
4299 write_unlock_bh(&idev->lock);
4300
4301 /* send a neighbour solicitation for our addr */
4302 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4303 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4304 ifp->dad_nonce);
4305out:
4306 in6_ifa_put(ifp);
4307 rtnl_unlock();
4308}
4309
4310/* ifp->idev must be at least read locked */
4311static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4312{
4313 struct inet6_ifaddr *ifpiter;
4314 struct inet6_dev *idev = ifp->idev;
4315
4316 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4317 if (ifpiter->scope > IFA_LINK)
4318 break;
4319 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4320 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4321 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4322 IFA_F_PERMANENT)
4323 return false;
4324 }
4325 return true;
4326}
4327
4328static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4329 bool send_na)
4330{
4331 struct net_device *dev = ifp->idev->dev;
4332 struct in6_addr lladdr;
4333 bool send_rs, send_mld;
4334
4335 addrconf_del_dad_work(ifp);
4336
4337 /*
4338 * Configure the address for reception. Now it is valid.
4339 */
4340
4341 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4342
4343 /* If added prefix is link local and we are prepared to process
4344 router advertisements, start sending router solicitations.
4345 */
4346
4347 read_lock_bh(&ifp->idev->lock);
4348 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4349 send_rs = send_mld &&
4350 ipv6_accept_ra(ifp->idev) &&
4351 READ_ONCE(ifp->idev->cnf.rtr_solicits) != 0 &&
4352 (dev->flags & IFF_LOOPBACK) == 0 &&
4353 (dev->type != ARPHRD_TUNNEL) &&
4354 !netif_is_team_port(dev);
4355 read_unlock_bh(&ifp->idev->lock);
4356
4357 /* While dad is in progress mld report's source address is in6_addrany.
4358 * Resend with proper ll now.
4359 */
4360 if (send_mld)
4361 ipv6_mc_dad_complete(ifp->idev);
4362
4363 /* send unsolicited NA if enabled */
4364 if (send_na &&
4365 (READ_ONCE(ifp->idev->cnf.ndisc_notify) ||
4366 READ_ONCE(dev_net(dev)->ipv6.devconf_all->ndisc_notify))) {
4367 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4368 /*router=*/ !!ifp->idev->cnf.forwarding,
4369 /*solicited=*/ false, /*override=*/ true,
4370 /*inc_opt=*/ true);
4371 }
4372
4373 if (send_rs) {
4374 /*
4375 * If a host as already performed a random delay
4376 * [...] as part of DAD [...] there is no need
4377 * to delay again before sending the first RS
4378 */
4379 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4380 return;
4381 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4382
4383 write_lock_bh(&ifp->idev->lock);
4384 spin_lock(&ifp->lock);
4385 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4386 READ_ONCE(ifp->idev->cnf.rtr_solicit_interval));
4387 ifp->idev->rs_probes = 1;
4388 ifp->idev->if_flags |= IF_RS_SENT;
4389 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4390 spin_unlock(&ifp->lock);
4391 write_unlock_bh(&ifp->idev->lock);
4392 }
4393
4394 if (bump_id)
4395 rt_genid_bump_ipv6(dev_net(dev));
4396
4397 /* Make sure that a new temporary address will be created
4398 * before this temporary address becomes deprecated.
4399 */
4400 if (ifp->flags & IFA_F_TEMPORARY)
4401 addrconf_verify_rtnl(dev_net(dev));
4402}
4403
4404static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4405{
4406 struct inet6_ifaddr *ifp;
4407
4408 read_lock_bh(&idev->lock);
4409 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4410 spin_lock(&ifp->lock);
4411 if ((ifp->flags & IFA_F_TENTATIVE &&
4412 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4413 if (restart)
4414 ifp->state = INET6_IFADDR_STATE_PREDAD;
4415 addrconf_dad_kick(ifp);
4416 }
4417 spin_unlock(&ifp->lock);
4418 }
4419 read_unlock_bh(&idev->lock);
4420}
4421
4422#ifdef CONFIG_PROC_FS
4423struct if6_iter_state {
4424 struct seq_net_private p;
4425 int bucket;
4426 int offset;
4427};
4428
4429static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4430{
4431 struct if6_iter_state *state = seq->private;
4432 struct net *net = seq_file_net(seq);
4433 struct inet6_ifaddr *ifa = NULL;
4434 int p = 0;
4435
4436 /* initial bucket if pos is 0 */
4437 if (pos == 0) {
4438 state->bucket = 0;
4439 state->offset = 0;
4440 }
4441
4442 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4443 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket],
4444 addr_lst) {
4445 /* sync with offset */
4446 if (p < state->offset) {
4447 p++;
4448 continue;
4449 }
4450 return ifa;
4451 }
4452
4453 /* prepare for next bucket */
4454 state->offset = 0;
4455 p = 0;
4456 }
4457 return NULL;
4458}
4459
4460static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4461 struct inet6_ifaddr *ifa)
4462{
4463 struct if6_iter_state *state = seq->private;
4464 struct net *net = seq_file_net(seq);
4465
4466 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4467 state->offset++;
4468 return ifa;
4469 }
4470
4471 state->offset = 0;
4472 while (++state->bucket < IN6_ADDR_HSIZE) {
4473 hlist_for_each_entry_rcu(ifa,
4474 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) {
4475 return ifa;
4476 }
4477 }
4478
4479 return NULL;
4480}
4481
4482static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4483 __acquires(rcu)
4484{
4485 rcu_read_lock();
4486 return if6_get_first(seq, *pos);
4487}
4488
4489static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4490{
4491 struct inet6_ifaddr *ifa;
4492
4493 ifa = if6_get_next(seq, v);
4494 ++*pos;
4495 return ifa;
4496}
4497
4498static void if6_seq_stop(struct seq_file *seq, void *v)
4499 __releases(rcu)
4500{
4501 rcu_read_unlock();
4502}
4503
4504static int if6_seq_show(struct seq_file *seq, void *v)
4505{
4506 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4507 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4508 &ifp->addr,
4509 ifp->idev->dev->ifindex,
4510 ifp->prefix_len,
4511 ifp->scope,
4512 (u8) ifp->flags,
4513 ifp->idev->dev->name);
4514 return 0;
4515}
4516
4517static const struct seq_operations if6_seq_ops = {
4518 .start = if6_seq_start,
4519 .next = if6_seq_next,
4520 .show = if6_seq_show,
4521 .stop = if6_seq_stop,
4522};
4523
4524static int __net_init if6_proc_net_init(struct net *net)
4525{
4526 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4527 sizeof(struct if6_iter_state)))
4528 return -ENOMEM;
4529 return 0;
4530}
4531
4532static void __net_exit if6_proc_net_exit(struct net *net)
4533{
4534 remove_proc_entry("if_inet6", net->proc_net);
4535}
4536
4537static struct pernet_operations if6_proc_net_ops = {
4538 .init = if6_proc_net_init,
4539 .exit = if6_proc_net_exit,
4540};
4541
4542int __init if6_proc_init(void)
4543{
4544 return register_pernet_subsys(&if6_proc_net_ops);
4545}
4546
4547void if6_proc_exit(void)
4548{
4549 unregister_pernet_subsys(&if6_proc_net_ops);
4550}
4551#endif /* CONFIG_PROC_FS */
4552
4553#if IS_ENABLED(CONFIG_IPV6_MIP6)
4554/* Check if address is a home address configured on any interface. */
4555int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4556{
4557 unsigned int hash = inet6_addr_hash(net, addr);
4558 struct inet6_ifaddr *ifp = NULL;
4559 int ret = 0;
4560
4561 rcu_read_lock();
4562 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4563 if (ipv6_addr_equal(&ifp->addr, addr) &&
4564 (ifp->flags & IFA_F_HOMEADDRESS)) {
4565 ret = 1;
4566 break;
4567 }
4568 }
4569 rcu_read_unlock();
4570 return ret;
4571}
4572#endif
4573
4574/* RFC6554 has some algorithm to avoid loops in segment routing by
4575 * checking if the segments contains any of a local interface address.
4576 *
4577 * Quote:
4578 *
4579 * To detect loops in the SRH, a router MUST determine if the SRH
4580 * includes multiple addresses assigned to any interface on that router.
4581 * If such addresses appear more than once and are separated by at least
4582 * one address not assigned to that router.
4583 */
4584int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4585 unsigned char nsegs)
4586{
4587 const struct in6_addr *addr;
4588 int i, ret = 0, found = 0;
4589 struct inet6_ifaddr *ifp;
4590 bool separated = false;
4591 unsigned int hash;
4592 bool hash_found;
4593
4594 rcu_read_lock();
4595 for (i = 0; i < nsegs; i++) {
4596 addr = &segs[i];
4597 hash = inet6_addr_hash(net, addr);
4598
4599 hash_found = false;
4600 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4601
4602 if (ipv6_addr_equal(&ifp->addr, addr)) {
4603 hash_found = true;
4604 break;
4605 }
4606 }
4607
4608 if (hash_found) {
4609 if (found > 1 && separated) {
4610 ret = 1;
4611 break;
4612 }
4613
4614 separated = false;
4615 found++;
4616 } else {
4617 separated = true;
4618 }
4619 }
4620 rcu_read_unlock();
4621
4622 return ret;
4623}
4624
4625/*
4626 * Periodic address status verification
4627 */
4628
4629static void addrconf_verify_rtnl(struct net *net)
4630{
4631 unsigned long now, next, next_sec, next_sched;
4632 struct inet6_ifaddr *ifp;
4633 int i;
4634
4635 ASSERT_RTNL();
4636
4637 rcu_read_lock_bh();
4638 now = jiffies;
4639 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4640
4641 cancel_delayed_work(&net->ipv6.addr_chk_work);
4642
4643 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4644restart:
4645 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) {
4646 unsigned long age;
4647
4648 /* When setting preferred_lft to a value not zero or
4649 * infinity, while valid_lft is infinity
4650 * IFA_F_PERMANENT has a non-infinity life time.
4651 */
4652 if ((ifp->flags & IFA_F_PERMANENT) &&
4653 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4654 continue;
4655
4656 spin_lock(&ifp->lock);
4657 /* We try to batch several events at once. */
4658 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4659
4660 if ((ifp->flags&IFA_F_TEMPORARY) &&
4661 !(ifp->flags&IFA_F_TENTATIVE) &&
4662 ifp->prefered_lft != INFINITY_LIFE_TIME &&
4663 !ifp->regen_count && ifp->ifpub) {
4664 /* This is a non-regenerated temporary addr. */
4665
4666 unsigned long regen_advance = ipv6_get_regen_advance(ifp->idev);
4667
4668 if (age + regen_advance >= ifp->prefered_lft) {
4669 struct inet6_ifaddr *ifpub = ifp->ifpub;
4670 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4671 next = ifp->tstamp + ifp->prefered_lft * HZ;
4672
4673 ifp->regen_count++;
4674 in6_ifa_hold(ifp);
4675 in6_ifa_hold(ifpub);
4676 spin_unlock(&ifp->lock);
4677
4678 spin_lock(&ifpub->lock);
4679 ifpub->regen_count = 0;
4680 spin_unlock(&ifpub->lock);
4681 rcu_read_unlock_bh();
4682 ipv6_create_tempaddr(ifpub, true);
4683 in6_ifa_put(ifpub);
4684 in6_ifa_put(ifp);
4685 rcu_read_lock_bh();
4686 goto restart;
4687 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4688 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4689 }
4690
4691 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4692 age >= ifp->valid_lft) {
4693 spin_unlock(&ifp->lock);
4694 in6_ifa_hold(ifp);
4695 rcu_read_unlock_bh();
4696 ipv6_del_addr(ifp);
4697 rcu_read_lock_bh();
4698 goto restart;
4699 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4700 spin_unlock(&ifp->lock);
4701 continue;
4702 } else if (age >= ifp->prefered_lft) {
4703 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4704 int deprecate = 0;
4705
4706 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4707 deprecate = 1;
4708 ifp->flags |= IFA_F_DEPRECATED;
4709 }
4710
4711 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4712 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4713 next = ifp->tstamp + ifp->valid_lft * HZ;
4714
4715 spin_unlock(&ifp->lock);
4716
4717 if (deprecate) {
4718 in6_ifa_hold(ifp);
4719
4720 ipv6_ifa_notify(0, ifp);
4721 in6_ifa_put(ifp);
4722 goto restart;
4723 }
4724 } else {
4725 /* ifp->prefered_lft <= ifp->valid_lft */
4726 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4727 next = ifp->tstamp + ifp->prefered_lft * HZ;
4728 spin_unlock(&ifp->lock);
4729 }
4730 }
4731 }
4732
4733 next_sec = round_jiffies_up(next);
4734 next_sched = next;
4735
4736 /* If rounded timeout is accurate enough, accept it. */
4737 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4738 next_sched = next_sec;
4739
4740 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4741 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4742 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4743
4744 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4745 now, next, next_sec, next_sched);
4746 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now);
4747 rcu_read_unlock_bh();
4748}
4749
4750static void addrconf_verify_work(struct work_struct *w)
4751{
4752 struct net *net = container_of(to_delayed_work(w), struct net,
4753 ipv6.addr_chk_work);
4754
4755 rtnl_lock();
4756 addrconf_verify_rtnl(net);
4757 rtnl_unlock();
4758}
4759
4760static void addrconf_verify(struct net *net)
4761{
4762 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0);
4763}
4764
4765static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4766 struct in6_addr **peer_pfx)
4767{
4768 struct in6_addr *pfx = NULL;
4769
4770 *peer_pfx = NULL;
4771
4772 if (addr)
4773 pfx = nla_data(addr);
4774
4775 if (local) {
4776 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4777 *peer_pfx = pfx;
4778 pfx = nla_data(local);
4779 }
4780
4781 return pfx;
4782}
4783
4784static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4785 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4786 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4787 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4788 [IFA_FLAGS] = { .len = sizeof(u32) },
4789 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4790 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4791 [IFA_PROTO] = { .type = NLA_U8 },
4792};
4793
4794static int
4795inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4796 struct netlink_ext_ack *extack)
4797{
4798 struct net *net = sock_net(skb->sk);
4799 struct ifaddrmsg *ifm;
4800 struct nlattr *tb[IFA_MAX+1];
4801 struct in6_addr *pfx, *peer_pfx;
4802 u32 ifa_flags;
4803 int err;
4804
4805 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4806 ifa_ipv6_policy, extack);
4807 if (err < 0)
4808 return err;
4809
4810 ifm = nlmsg_data(nlh);
4811 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4812 if (!pfx)
4813 return -EINVAL;
4814
4815 ifa_flags = nla_get_u32_default(tb[IFA_FLAGS], ifm->ifa_flags);
4816
4817 /* We ignore other flags so far. */
4818 ifa_flags &= IFA_F_MANAGETEMPADDR;
4819
4820 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4821 ifm->ifa_prefixlen, extack);
4822}
4823
4824static int modify_prefix_route(struct net *net, struct inet6_ifaddr *ifp,
4825 unsigned long expires, u32 flags,
4826 bool modify_peer)
4827{
4828 struct fib6_table *table;
4829 struct fib6_info *f6i;
4830 u32 prio;
4831
4832 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4833 ifp->prefix_len,
4834 ifp->idev->dev, 0, RTF_DEFAULT, true);
4835 if (!f6i)
4836 return -ENOENT;
4837
4838 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4839 if (f6i->fib6_metric != prio) {
4840 /* delete old one */
4841 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4842
4843 /* add new one */
4844 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4845 ifp->prefix_len,
4846 ifp->rt_priority, ifp->idev->dev,
4847 expires, flags, GFP_KERNEL);
4848 return 0;
4849 }
4850 if (f6i != net->ipv6.fib6_null_entry) {
4851 table = f6i->fib6_table;
4852 spin_lock_bh(&table->tb6_lock);
4853
4854 if (!(flags & RTF_EXPIRES)) {
4855 fib6_clean_expires(f6i);
4856 fib6_remove_gc_list(f6i);
4857 } else {
4858 fib6_set_expires(f6i, expires);
4859 fib6_add_gc_list(f6i);
4860 }
4861
4862 spin_unlock_bh(&table->tb6_lock);
4863 }
4864 fib6_info_release(f6i);
4865
4866 return 0;
4867}
4868
4869static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp,
4870 struct ifa6_config *cfg)
4871{
4872 u32 flags;
4873 clock_t expires;
4874 unsigned long timeout;
4875 bool was_managetempaddr;
4876 bool had_prefixroute;
4877 bool new_peer = false;
4878
4879 ASSERT_RTNL();
4880
4881 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4882 return -EINVAL;
4883
4884 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4885 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4886 return -EINVAL;
4887
4888 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4889 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4890
4891 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4892 if (addrconf_finite_timeout(timeout)) {
4893 expires = jiffies_to_clock_t(timeout * HZ);
4894 cfg->valid_lft = timeout;
4895 flags = RTF_EXPIRES;
4896 } else {
4897 expires = 0;
4898 flags = 0;
4899 cfg->ifa_flags |= IFA_F_PERMANENT;
4900 }
4901
4902 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4903 if (addrconf_finite_timeout(timeout)) {
4904 if (timeout == 0)
4905 cfg->ifa_flags |= IFA_F_DEPRECATED;
4906 cfg->preferred_lft = timeout;
4907 }
4908
4909 if (cfg->peer_pfx &&
4910 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4911 if (!ipv6_addr_any(&ifp->peer_addr))
4912 cleanup_prefix_route(ifp, expires, true, true);
4913 new_peer = true;
4914 }
4915
4916 spin_lock_bh(&ifp->lock);
4917 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4918 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4919 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4920 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4921 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4922 IFA_F_NOPREFIXROUTE);
4923 ifp->flags |= cfg->ifa_flags;
4924 WRITE_ONCE(ifp->tstamp, jiffies);
4925 WRITE_ONCE(ifp->valid_lft, cfg->valid_lft);
4926 WRITE_ONCE(ifp->prefered_lft, cfg->preferred_lft);
4927 WRITE_ONCE(ifp->ifa_proto, cfg->ifa_proto);
4928
4929 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4930 WRITE_ONCE(ifp->rt_priority, cfg->rt_priority);
4931
4932 if (new_peer)
4933 ifp->peer_addr = *cfg->peer_pfx;
4934
4935 spin_unlock_bh(&ifp->lock);
4936 if (!(ifp->flags&IFA_F_TENTATIVE))
4937 ipv6_ifa_notify(0, ifp);
4938
4939 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4940 int rc = -ENOENT;
4941
4942 if (had_prefixroute)
4943 rc = modify_prefix_route(net, ifp, expires, flags, false);
4944
4945 /* prefix route could have been deleted; if so restore it */
4946 if (rc == -ENOENT) {
4947 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4948 ifp->rt_priority, ifp->idev->dev,
4949 expires, flags, GFP_KERNEL);
4950 }
4951
4952 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4953 rc = modify_prefix_route(net, ifp, expires, flags, true);
4954
4955 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4956 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4957 ifp->rt_priority, ifp->idev->dev,
4958 expires, flags, GFP_KERNEL);
4959 }
4960 } else if (had_prefixroute) {
4961 enum cleanup_prefix_rt_t action;
4962 unsigned long rt_expires;
4963
4964 write_lock_bh(&ifp->idev->lock);
4965 action = check_cleanup_prefix_route(ifp, &rt_expires);
4966 write_unlock_bh(&ifp->idev->lock);
4967
4968 if (action != CLEANUP_PREFIX_RT_NOP) {
4969 cleanup_prefix_route(ifp, rt_expires,
4970 action == CLEANUP_PREFIX_RT_DEL, false);
4971 }
4972 }
4973
4974 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4975 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4976 delete_tempaddrs(ifp->idev, ifp);
4977 else
4978 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4979 cfg->preferred_lft, !was_managetempaddr,
4980 jiffies);
4981 }
4982
4983 addrconf_verify_rtnl(net);
4984
4985 return 0;
4986}
4987
4988static int
4989inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4990 struct netlink_ext_ack *extack)
4991{
4992 struct net *net = sock_net(skb->sk);
4993 struct ifaddrmsg *ifm;
4994 struct nlattr *tb[IFA_MAX+1];
4995 struct in6_addr *peer_pfx;
4996 struct inet6_ifaddr *ifa;
4997 struct net_device *dev;
4998 struct inet6_dev *idev;
4999 struct ifa6_config cfg;
5000 int err;
5001
5002 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5003 ifa_ipv6_policy, extack);
5004 if (err < 0)
5005 return err;
5006
5007 memset(&cfg, 0, sizeof(cfg));
5008
5009 ifm = nlmsg_data(nlh);
5010 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
5011 if (!cfg.pfx)
5012 return -EINVAL;
5013
5014 cfg.peer_pfx = peer_pfx;
5015 cfg.plen = ifm->ifa_prefixlen;
5016 if (tb[IFA_RT_PRIORITY])
5017 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
5018
5019 if (tb[IFA_PROTO])
5020 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]);
5021
5022 cfg.valid_lft = INFINITY_LIFE_TIME;
5023 cfg.preferred_lft = INFINITY_LIFE_TIME;
5024
5025 if (tb[IFA_CACHEINFO]) {
5026 struct ifa_cacheinfo *ci;
5027
5028 ci = nla_data(tb[IFA_CACHEINFO]);
5029 cfg.valid_lft = ci->ifa_valid;
5030 cfg.preferred_lft = ci->ifa_prefered;
5031 }
5032
5033 dev = __dev_get_by_index(net, ifm->ifa_index);
5034 if (!dev) {
5035 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
5036 return -ENODEV;
5037 }
5038
5039 cfg.ifa_flags = nla_get_u32_default(tb[IFA_FLAGS], ifm->ifa_flags);
5040
5041 /* We ignore other flags so far. */
5042 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
5043 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
5044 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
5045
5046 idev = ipv6_find_idev(dev);
5047 if (IS_ERR(idev))
5048 return PTR_ERR(idev);
5049
5050 if (!ipv6_allow_optimistic_dad(net, idev))
5051 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
5052
5053 if (cfg.ifa_flags & IFA_F_NODAD &&
5054 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
5055 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
5056 return -EINVAL;
5057 }
5058
5059 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
5060 if (!ifa) {
5061 /*
5062 * It would be best to check for !NLM_F_CREATE here but
5063 * userspace already relies on not having to provide this.
5064 */
5065 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
5066 }
5067
5068 if (nlh->nlmsg_flags & NLM_F_EXCL ||
5069 !(nlh->nlmsg_flags & NLM_F_REPLACE)) {
5070 NL_SET_ERR_MSG_MOD(extack, "address already assigned");
5071 err = -EEXIST;
5072 } else {
5073 err = inet6_addr_modify(net, ifa, &cfg);
5074 }
5075
5076 in6_ifa_put(ifa);
5077
5078 return err;
5079}
5080
5081static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
5082 u8 scope, int ifindex)
5083{
5084 struct ifaddrmsg *ifm;
5085
5086 ifm = nlmsg_data(nlh);
5087 ifm->ifa_family = AF_INET6;
5088 ifm->ifa_prefixlen = prefixlen;
5089 ifm->ifa_flags = flags;
5090 ifm->ifa_scope = scope;
5091 ifm->ifa_index = ifindex;
5092}
5093
5094static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
5095 unsigned long tstamp, u32 preferred, u32 valid)
5096{
5097 struct ifa_cacheinfo ci;
5098
5099 ci.cstamp = cstamp_delta(cstamp);
5100 ci.tstamp = cstamp_delta(tstamp);
5101 ci.ifa_prefered = preferred;
5102 ci.ifa_valid = valid;
5103
5104 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
5105}
5106
5107static inline int rt_scope(int ifa_scope)
5108{
5109 if (ifa_scope & IFA_HOST)
5110 return RT_SCOPE_HOST;
5111 else if (ifa_scope & IFA_LINK)
5112 return RT_SCOPE_LINK;
5113 else if (ifa_scope & IFA_SITE)
5114 return RT_SCOPE_SITE;
5115 else
5116 return RT_SCOPE_UNIVERSE;
5117}
5118
5119static inline int inet6_ifaddr_msgsize(void)
5120{
5121 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
5122 + nla_total_size(16) /* IFA_LOCAL */
5123 + nla_total_size(16) /* IFA_ADDRESS */
5124 + nla_total_size(sizeof(struct ifa_cacheinfo))
5125 + nla_total_size(4) /* IFA_FLAGS */
5126 + nla_total_size(1) /* IFA_PROTO */
5127 + nla_total_size(4) /* IFA_RT_PRIORITY */;
5128}
5129
5130enum addr_type_t {
5131 UNICAST_ADDR,
5132 MULTICAST_ADDR,
5133 ANYCAST_ADDR,
5134};
5135
5136struct inet6_fill_args {
5137 u32 portid;
5138 u32 seq;
5139 int event;
5140 unsigned int flags;
5141 int netnsid;
5142 int ifindex;
5143 enum addr_type_t type;
5144};
5145
5146static int inet6_fill_ifaddr(struct sk_buff *skb,
5147 const struct inet6_ifaddr *ifa,
5148 struct inet6_fill_args *args)
5149{
5150 struct nlmsghdr *nlh;
5151 u32 preferred, valid;
5152 u32 flags, priority;
5153 u8 proto;
5154
5155 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5156 sizeof(struct ifaddrmsg), args->flags);
5157 if (!nlh)
5158 return -EMSGSIZE;
5159
5160 flags = READ_ONCE(ifa->flags);
5161 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
5162 ifa->idev->dev->ifindex);
5163
5164 if (args->netnsid >= 0 &&
5165 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5166 goto error;
5167
5168 preferred = READ_ONCE(ifa->prefered_lft);
5169 valid = READ_ONCE(ifa->valid_lft);
5170
5171 if (!((flags & IFA_F_PERMANENT) &&
5172 (preferred == INFINITY_LIFE_TIME))) {
5173 if (preferred != INFINITY_LIFE_TIME) {
5174 long tval = (jiffies - READ_ONCE(ifa->tstamp)) / HZ;
5175
5176 if (preferred > tval)
5177 preferred -= tval;
5178 else
5179 preferred = 0;
5180 if (valid != INFINITY_LIFE_TIME) {
5181 if (valid > tval)
5182 valid -= tval;
5183 else
5184 valid = 0;
5185 }
5186 }
5187 } else {
5188 preferred = INFINITY_LIFE_TIME;
5189 valid = INFINITY_LIFE_TIME;
5190 }
5191
5192 if (!ipv6_addr_any(&ifa->peer_addr)) {
5193 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5194 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5195 goto error;
5196 } else {
5197 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5198 goto error;
5199 }
5200
5201 priority = READ_ONCE(ifa->rt_priority);
5202 if (priority && nla_put_u32(skb, IFA_RT_PRIORITY, priority))
5203 goto error;
5204
5205 if (put_cacheinfo(skb, ifa->cstamp, READ_ONCE(ifa->tstamp),
5206 preferred, valid) < 0)
5207 goto error;
5208
5209 if (nla_put_u32(skb, IFA_FLAGS, flags) < 0)
5210 goto error;
5211
5212 proto = READ_ONCE(ifa->ifa_proto);
5213 if (proto && nla_put_u8(skb, IFA_PROTO, proto))
5214 goto error;
5215
5216 nlmsg_end(skb, nlh);
5217 return 0;
5218
5219error:
5220 nlmsg_cancel(skb, nlh);
5221 return -EMSGSIZE;
5222}
5223
5224static int inet6_fill_ifmcaddr(struct sk_buff *skb,
5225 const struct ifmcaddr6 *ifmca,
5226 struct inet6_fill_args *args)
5227{
5228 int ifindex = ifmca->idev->dev->ifindex;
5229 u8 scope = RT_SCOPE_UNIVERSE;
5230 struct nlmsghdr *nlh;
5231
5232 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5233 scope = RT_SCOPE_SITE;
5234
5235 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5236 sizeof(struct ifaddrmsg), args->flags);
5237 if (!nlh)
5238 return -EMSGSIZE;
5239
5240 if (args->netnsid >= 0 &&
5241 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5242 nlmsg_cancel(skb, nlh);
5243 return -EMSGSIZE;
5244 }
5245
5246 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5247 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5248 put_cacheinfo(skb, ifmca->mca_cstamp, READ_ONCE(ifmca->mca_tstamp),
5249 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5250 nlmsg_cancel(skb, nlh);
5251 return -EMSGSIZE;
5252 }
5253
5254 nlmsg_end(skb, nlh);
5255 return 0;
5256}
5257
5258static int inet6_fill_ifacaddr(struct sk_buff *skb,
5259 const struct ifacaddr6 *ifaca,
5260 struct inet6_fill_args *args)
5261{
5262 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5263 int ifindex = dev ? dev->ifindex : 1;
5264 u8 scope = RT_SCOPE_UNIVERSE;
5265 struct nlmsghdr *nlh;
5266
5267 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5268 scope = RT_SCOPE_SITE;
5269
5270 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5271 sizeof(struct ifaddrmsg), args->flags);
5272 if (!nlh)
5273 return -EMSGSIZE;
5274
5275 if (args->netnsid >= 0 &&
5276 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5277 nlmsg_cancel(skb, nlh);
5278 return -EMSGSIZE;
5279 }
5280
5281 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5282 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5283 put_cacheinfo(skb, ifaca->aca_cstamp, READ_ONCE(ifaca->aca_tstamp),
5284 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5285 nlmsg_cancel(skb, nlh);
5286 return -EMSGSIZE;
5287 }
5288
5289 nlmsg_end(skb, nlh);
5290 return 0;
5291}
5292
5293/* called with rcu_read_lock() */
5294static int in6_dump_addrs(const struct inet6_dev *idev, struct sk_buff *skb,
5295 struct netlink_callback *cb, int *s_ip_idx,
5296 struct inet6_fill_args *fillargs)
5297{
5298 const struct ifmcaddr6 *ifmca;
5299 const struct ifacaddr6 *ifaca;
5300 int ip_idx = 0;
5301 int err = 0;
5302
5303 switch (fillargs->type) {
5304 case UNICAST_ADDR: {
5305 const struct inet6_ifaddr *ifa;
5306 fillargs->event = RTM_NEWADDR;
5307
5308 /* unicast address incl. temp addr */
5309 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
5310 if (ip_idx < *s_ip_idx)
5311 goto next;
5312 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5313 if (err < 0)
5314 break;
5315 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5316next:
5317 ip_idx++;
5318 }
5319 break;
5320 }
5321 case MULTICAST_ADDR:
5322 fillargs->event = RTM_GETMULTICAST;
5323
5324 /* multicast address */
5325 for (ifmca = rcu_dereference(idev->mc_list);
5326 ifmca;
5327 ifmca = rcu_dereference(ifmca->next), ip_idx++) {
5328 if (ip_idx < *s_ip_idx)
5329 continue;
5330 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5331 if (err < 0)
5332 break;
5333 }
5334 break;
5335 case ANYCAST_ADDR:
5336 fillargs->event = RTM_GETANYCAST;
5337 /* anycast address */
5338 for (ifaca = rcu_dereference(idev->ac_list); ifaca;
5339 ifaca = rcu_dereference(ifaca->aca_next), ip_idx++) {
5340 if (ip_idx < *s_ip_idx)
5341 continue;
5342 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5343 if (err < 0)
5344 break;
5345 }
5346 break;
5347 default:
5348 break;
5349 }
5350 *s_ip_idx = err ? ip_idx : 0;
5351 return err;
5352}
5353
5354static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5355 struct inet6_fill_args *fillargs,
5356 struct net **tgt_net, struct sock *sk,
5357 struct netlink_callback *cb)
5358{
5359 struct netlink_ext_ack *extack = cb->extack;
5360 struct nlattr *tb[IFA_MAX+1];
5361 struct ifaddrmsg *ifm;
5362 int err, i;
5363
5364 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5365 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5366 return -EINVAL;
5367 }
5368
5369 ifm = nlmsg_data(nlh);
5370 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5371 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5372 return -EINVAL;
5373 }
5374
5375 fillargs->ifindex = ifm->ifa_index;
5376 if (fillargs->ifindex) {
5377 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5378 fillargs->flags |= NLM_F_DUMP_FILTERED;
5379 }
5380
5381 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5382 ifa_ipv6_policy, extack);
5383 if (err < 0)
5384 return err;
5385
5386 for (i = 0; i <= IFA_MAX; ++i) {
5387 if (!tb[i])
5388 continue;
5389
5390 if (i == IFA_TARGET_NETNSID) {
5391 struct net *net;
5392
5393 fillargs->netnsid = nla_get_s32(tb[i]);
5394 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5395 if (IS_ERR(net)) {
5396 fillargs->netnsid = -1;
5397 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5398 return PTR_ERR(net);
5399 }
5400 *tgt_net = net;
5401 } else {
5402 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5403 return -EINVAL;
5404 }
5405 }
5406
5407 return 0;
5408}
5409
5410static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5411 enum addr_type_t type)
5412{
5413 struct net *tgt_net = sock_net(skb->sk);
5414 const struct nlmsghdr *nlh = cb->nlh;
5415 struct inet6_fill_args fillargs = {
5416 .portid = NETLINK_CB(cb->skb).portid,
5417 .seq = cb->nlh->nlmsg_seq,
5418 .flags = NLM_F_MULTI,
5419 .netnsid = -1,
5420 .type = type,
5421 };
5422 struct {
5423 unsigned long ifindex;
5424 int ip_idx;
5425 } *ctx = (void *)cb->ctx;
5426 struct net_device *dev;
5427 struct inet6_dev *idev;
5428 int err = 0;
5429
5430 rcu_read_lock();
5431 if (cb->strict_check) {
5432 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5433 skb->sk, cb);
5434 if (err < 0)
5435 goto done;
5436
5437 err = 0;
5438 if (fillargs.ifindex) {
5439 dev = dev_get_by_index_rcu(tgt_net, fillargs.ifindex);
5440 if (!dev) {
5441 err = -ENODEV;
5442 goto done;
5443 }
5444 idev = __in6_dev_get(dev);
5445 if (idev)
5446 err = in6_dump_addrs(idev, skb, cb,
5447 &ctx->ip_idx,
5448 &fillargs);
5449 goto done;
5450 }
5451 }
5452
5453 cb->seq = inet6_base_seq(tgt_net);
5454 for_each_netdev_dump(tgt_net, dev, ctx->ifindex) {
5455 idev = __in6_dev_get(dev);
5456 if (!idev)
5457 continue;
5458 err = in6_dump_addrs(idev, skb, cb, &ctx->ip_idx,
5459 &fillargs);
5460 if (err < 0)
5461 goto done;
5462 }
5463done:
5464 rcu_read_unlock();
5465 if (fillargs.netnsid >= 0)
5466 put_net(tgt_net);
5467
5468 return err;
5469}
5470
5471static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5472{
5473 enum addr_type_t type = UNICAST_ADDR;
5474
5475 return inet6_dump_addr(skb, cb, type);
5476}
5477
5478static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5479{
5480 enum addr_type_t type = MULTICAST_ADDR;
5481
5482 return inet6_dump_addr(skb, cb, type);
5483}
5484
5485
5486static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5487{
5488 enum addr_type_t type = ANYCAST_ADDR;
5489
5490 return inet6_dump_addr(skb, cb, type);
5491}
5492
5493static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5494 const struct nlmsghdr *nlh,
5495 struct nlattr **tb,
5496 struct netlink_ext_ack *extack)
5497{
5498 struct ifaddrmsg *ifm;
5499 int i, err;
5500
5501 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5502 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5503 return -EINVAL;
5504 }
5505
5506 if (!netlink_strict_get_check(skb))
5507 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5508 ifa_ipv6_policy, extack);
5509
5510 ifm = nlmsg_data(nlh);
5511 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5512 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5513 return -EINVAL;
5514 }
5515
5516 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5517 ifa_ipv6_policy, extack);
5518 if (err)
5519 return err;
5520
5521 for (i = 0; i <= IFA_MAX; i++) {
5522 if (!tb[i])
5523 continue;
5524
5525 switch (i) {
5526 case IFA_TARGET_NETNSID:
5527 case IFA_ADDRESS:
5528 case IFA_LOCAL:
5529 break;
5530 default:
5531 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5532 return -EINVAL;
5533 }
5534 }
5535
5536 return 0;
5537}
5538
5539static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5540 struct netlink_ext_ack *extack)
5541{
5542 struct net *tgt_net = sock_net(in_skb->sk);
5543 struct inet6_fill_args fillargs = {
5544 .portid = NETLINK_CB(in_skb).portid,
5545 .seq = nlh->nlmsg_seq,
5546 .event = RTM_NEWADDR,
5547 .flags = 0,
5548 .netnsid = -1,
5549 };
5550 struct ifaddrmsg *ifm;
5551 struct nlattr *tb[IFA_MAX+1];
5552 struct in6_addr *addr = NULL, *peer;
5553 struct net_device *dev = NULL;
5554 struct inet6_ifaddr *ifa;
5555 struct sk_buff *skb;
5556 int err;
5557
5558 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5559 if (err < 0)
5560 return err;
5561
5562 if (tb[IFA_TARGET_NETNSID]) {
5563 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5564
5565 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5566 fillargs.netnsid);
5567 if (IS_ERR(tgt_net))
5568 return PTR_ERR(tgt_net);
5569 }
5570
5571 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5572 if (!addr) {
5573 err = -EINVAL;
5574 goto errout;
5575 }
5576 ifm = nlmsg_data(nlh);
5577 if (ifm->ifa_index)
5578 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5579
5580 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5581 if (!ifa) {
5582 err = -EADDRNOTAVAIL;
5583 goto errout;
5584 }
5585
5586 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5587 if (!skb) {
5588 err = -ENOBUFS;
5589 goto errout_ifa;
5590 }
5591
5592 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5593 if (err < 0) {
5594 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5595 WARN_ON(err == -EMSGSIZE);
5596 kfree_skb(skb);
5597 goto errout_ifa;
5598 }
5599 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5600errout_ifa:
5601 in6_ifa_put(ifa);
5602errout:
5603 dev_put(dev);
5604 if (fillargs.netnsid >= 0)
5605 put_net(tgt_net);
5606
5607 return err;
5608}
5609
5610static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5611{
5612 struct sk_buff *skb;
5613 struct net *net = dev_net(ifa->idev->dev);
5614 struct inet6_fill_args fillargs = {
5615 .portid = 0,
5616 .seq = 0,
5617 .event = event,
5618 .flags = 0,
5619 .netnsid = -1,
5620 };
5621 int err = -ENOBUFS;
5622
5623 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5624 if (!skb)
5625 goto errout;
5626
5627 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5628 if (err < 0) {
5629 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5630 WARN_ON(err == -EMSGSIZE);
5631 kfree_skb(skb);
5632 goto errout;
5633 }
5634 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5635 return;
5636errout:
5637 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5638}
5639
5640static void ipv6_store_devconf(const struct ipv6_devconf *cnf,
5641 __s32 *array, int bytes)
5642{
5643 BUG_ON(bytes < (DEVCONF_MAX * 4));
5644
5645 memset(array, 0, bytes);
5646 array[DEVCONF_FORWARDING] = READ_ONCE(cnf->forwarding);
5647 array[DEVCONF_HOPLIMIT] = READ_ONCE(cnf->hop_limit);
5648 array[DEVCONF_MTU6] = READ_ONCE(cnf->mtu6);
5649 array[DEVCONF_ACCEPT_RA] = READ_ONCE(cnf->accept_ra);
5650 array[DEVCONF_ACCEPT_REDIRECTS] = READ_ONCE(cnf->accept_redirects);
5651 array[DEVCONF_AUTOCONF] = READ_ONCE(cnf->autoconf);
5652 array[DEVCONF_DAD_TRANSMITS] = READ_ONCE(cnf->dad_transmits);
5653 array[DEVCONF_RTR_SOLICITS] = READ_ONCE(cnf->rtr_solicits);
5654 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5655 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_interval));
5656 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5657 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_max_interval));
5658 array[DEVCONF_RTR_SOLICIT_DELAY] =
5659 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_delay));
5660 array[DEVCONF_FORCE_MLD_VERSION] = READ_ONCE(cnf->force_mld_version);
5661 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5662 jiffies_to_msecs(READ_ONCE(cnf->mldv1_unsolicited_report_interval));
5663 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5664 jiffies_to_msecs(READ_ONCE(cnf->mldv2_unsolicited_report_interval));
5665 array[DEVCONF_USE_TEMPADDR] = READ_ONCE(cnf->use_tempaddr);
5666 array[DEVCONF_TEMP_VALID_LFT] = READ_ONCE(cnf->temp_valid_lft);
5667 array[DEVCONF_TEMP_PREFERED_LFT] = READ_ONCE(cnf->temp_prefered_lft);
5668 array[DEVCONF_REGEN_MAX_RETRY] = READ_ONCE(cnf->regen_max_retry);
5669 array[DEVCONF_MAX_DESYNC_FACTOR] = READ_ONCE(cnf->max_desync_factor);
5670 array[DEVCONF_MAX_ADDRESSES] = READ_ONCE(cnf->max_addresses);
5671 array[DEVCONF_ACCEPT_RA_DEFRTR] = READ_ONCE(cnf->accept_ra_defrtr);
5672 array[DEVCONF_RA_DEFRTR_METRIC] = READ_ONCE(cnf->ra_defrtr_metric);
5673 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] =
5674 READ_ONCE(cnf->accept_ra_min_hop_limit);
5675 array[DEVCONF_ACCEPT_RA_PINFO] = READ_ONCE(cnf->accept_ra_pinfo);
5676#ifdef CONFIG_IPV6_ROUTER_PREF
5677 array[DEVCONF_ACCEPT_RA_RTR_PREF] = READ_ONCE(cnf->accept_ra_rtr_pref);
5678 array[DEVCONF_RTR_PROBE_INTERVAL] =
5679 jiffies_to_msecs(READ_ONCE(cnf->rtr_probe_interval));
5680#ifdef CONFIG_IPV6_ROUTE_INFO
5681 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] =
5682 READ_ONCE(cnf->accept_ra_rt_info_min_plen);
5683 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] =
5684 READ_ONCE(cnf->accept_ra_rt_info_max_plen);
5685#endif
5686#endif
5687 array[DEVCONF_PROXY_NDP] = READ_ONCE(cnf->proxy_ndp);
5688 array[DEVCONF_ACCEPT_SOURCE_ROUTE] =
5689 READ_ONCE(cnf->accept_source_route);
5690#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5691 array[DEVCONF_OPTIMISTIC_DAD] = READ_ONCE(cnf->optimistic_dad);
5692 array[DEVCONF_USE_OPTIMISTIC] = READ_ONCE(cnf->use_optimistic);
5693#endif
5694#ifdef CONFIG_IPV6_MROUTE
5695 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5696#endif
5697 array[DEVCONF_DISABLE_IPV6] = READ_ONCE(cnf->disable_ipv6);
5698 array[DEVCONF_ACCEPT_DAD] = READ_ONCE(cnf->accept_dad);
5699 array[DEVCONF_FORCE_TLLAO] = READ_ONCE(cnf->force_tllao);
5700 array[DEVCONF_NDISC_NOTIFY] = READ_ONCE(cnf->ndisc_notify);
5701 array[DEVCONF_SUPPRESS_FRAG_NDISC] =
5702 READ_ONCE(cnf->suppress_frag_ndisc);
5703 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] =
5704 READ_ONCE(cnf->accept_ra_from_local);
5705 array[DEVCONF_ACCEPT_RA_MTU] = READ_ONCE(cnf->accept_ra_mtu);
5706 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] =
5707 READ_ONCE(cnf->ignore_routes_with_linkdown);
5708 /* we omit DEVCONF_STABLE_SECRET for now */
5709 array[DEVCONF_USE_OIF_ADDRS_ONLY] = READ_ONCE(cnf->use_oif_addrs_only);
5710 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] =
5711 READ_ONCE(cnf->drop_unicast_in_l2_multicast);
5712 array[DEVCONF_DROP_UNSOLICITED_NA] = READ_ONCE(cnf->drop_unsolicited_na);
5713 array[DEVCONF_KEEP_ADDR_ON_DOWN] = READ_ONCE(cnf->keep_addr_on_down);
5714 array[DEVCONF_SEG6_ENABLED] = READ_ONCE(cnf->seg6_enabled);
5715#ifdef CONFIG_IPV6_SEG6_HMAC
5716 array[DEVCONF_SEG6_REQUIRE_HMAC] = READ_ONCE(cnf->seg6_require_hmac);
5717#endif
5718 array[DEVCONF_ENHANCED_DAD] = READ_ONCE(cnf->enhanced_dad);
5719 array[DEVCONF_ADDR_GEN_MODE] = READ_ONCE(cnf->addr_gen_mode);
5720 array[DEVCONF_DISABLE_POLICY] = READ_ONCE(cnf->disable_policy);
5721 array[DEVCONF_NDISC_TCLASS] = READ_ONCE(cnf->ndisc_tclass);
5722 array[DEVCONF_RPL_SEG_ENABLED] = READ_ONCE(cnf->rpl_seg_enabled);
5723 array[DEVCONF_IOAM6_ENABLED] = READ_ONCE(cnf->ioam6_enabled);
5724 array[DEVCONF_IOAM6_ID] = READ_ONCE(cnf->ioam6_id);
5725 array[DEVCONF_IOAM6_ID_WIDE] = READ_ONCE(cnf->ioam6_id_wide);
5726 array[DEVCONF_NDISC_EVICT_NOCARRIER] =
5727 READ_ONCE(cnf->ndisc_evict_nocarrier);
5728 array[DEVCONF_ACCEPT_UNTRACKED_NA] =
5729 READ_ONCE(cnf->accept_untracked_na);
5730 array[DEVCONF_ACCEPT_RA_MIN_LFT] = READ_ONCE(cnf->accept_ra_min_lft);
5731}
5732
5733static inline size_t inet6_ifla6_size(void)
5734{
5735 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5736 + nla_total_size(sizeof(struct ifla_cacheinfo))
5737 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5738 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5739 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5740 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5741 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5742 + nla_total_size(4) /* IFLA_INET6_RA_MTU */
5743 + 0;
5744}
5745
5746static inline size_t inet6_if_nlmsg_size(void)
5747{
5748 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5749 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5750 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5751 + nla_total_size(4) /* IFLA_MTU */
5752 + nla_total_size(4) /* IFLA_LINK */
5753 + nla_total_size(1) /* IFLA_OPERSTATE */
5754 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5755}
5756
5757static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5758 int bytes)
5759{
5760 int i;
5761 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5762 BUG_ON(pad < 0);
5763
5764 /* Use put_unaligned() because stats may not be aligned for u64. */
5765 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5766 for (i = 1; i < ICMP6_MIB_MAX; i++)
5767 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5768
5769 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5770}
5771
5772static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5773 int bytes, size_t syncpoff)
5774{
5775 int i, c;
5776 u64 buff[IPSTATS_MIB_MAX];
5777 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5778
5779 BUG_ON(pad < 0);
5780
5781 memset(buff, 0, sizeof(buff));
5782 buff[0] = IPSTATS_MIB_MAX;
5783
5784 for_each_possible_cpu(c) {
5785 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5786 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5787 }
5788
5789 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5790 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5791}
5792
5793static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5794 int bytes)
5795{
5796 switch (attrtype) {
5797 case IFLA_INET6_STATS:
5798 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5799 offsetof(struct ipstats_mib, syncp));
5800 break;
5801 case IFLA_INET6_ICMP6STATS:
5802 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5803 break;
5804 }
5805}
5806
5807static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5808 u32 ext_filter_mask)
5809{
5810 struct ifla_cacheinfo ci;
5811 struct nlattr *nla;
5812 u32 ra_mtu;
5813
5814 if (nla_put_u32(skb, IFLA_INET6_FLAGS, READ_ONCE(idev->if_flags)))
5815 goto nla_put_failure;
5816 ci.max_reasm_len = IPV6_MAXPLEN;
5817 ci.tstamp = cstamp_delta(READ_ONCE(idev->tstamp));
5818 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5819 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5820 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5821 goto nla_put_failure;
5822 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5823 if (!nla)
5824 goto nla_put_failure;
5825 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5826
5827 /* XXX - MC not implemented */
5828
5829 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5830 return 0;
5831
5832 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5833 if (!nla)
5834 goto nla_put_failure;
5835 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5836
5837 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5838 if (!nla)
5839 goto nla_put_failure;
5840 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5841
5842 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5843 if (!nla)
5844 goto nla_put_failure;
5845 read_lock_bh(&idev->lock);
5846 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5847 read_unlock_bh(&idev->lock);
5848
5849 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE,
5850 READ_ONCE(idev->cnf.addr_gen_mode)))
5851 goto nla_put_failure;
5852
5853 ra_mtu = READ_ONCE(idev->ra_mtu);
5854 if (ra_mtu && nla_put_u32(skb, IFLA_INET6_RA_MTU, ra_mtu))
5855 goto nla_put_failure;
5856
5857 return 0;
5858
5859nla_put_failure:
5860 return -EMSGSIZE;
5861}
5862
5863static size_t inet6_get_link_af_size(const struct net_device *dev,
5864 u32 ext_filter_mask)
5865{
5866 if (!__in6_dev_get(dev))
5867 return 0;
5868
5869 return inet6_ifla6_size();
5870}
5871
5872static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5873 u32 ext_filter_mask)
5874{
5875 struct inet6_dev *idev = __in6_dev_get(dev);
5876
5877 if (!idev)
5878 return -ENODATA;
5879
5880 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5881 return -EMSGSIZE;
5882
5883 return 0;
5884}
5885
5886static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5887 struct netlink_ext_ack *extack)
5888{
5889 struct inet6_ifaddr *ifp;
5890 struct net_device *dev = idev->dev;
5891 bool clear_token, update_rs = false;
5892 struct in6_addr ll_addr;
5893
5894 ASSERT_RTNL();
5895
5896 if (!token)
5897 return -EINVAL;
5898
5899 if (dev->flags & IFF_LOOPBACK) {
5900 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
5901 return -EINVAL;
5902 }
5903
5904 if (dev->flags & IFF_NOARP) {
5905 NL_SET_ERR_MSG_MOD(extack,
5906 "Device does not do neighbour discovery");
5907 return -EINVAL;
5908 }
5909
5910 if (!ipv6_accept_ra(idev)) {
5911 NL_SET_ERR_MSG_MOD(extack,
5912 "Router advertisement is disabled on device");
5913 return -EINVAL;
5914 }
5915
5916 if (READ_ONCE(idev->cnf.rtr_solicits) == 0) {
5917 NL_SET_ERR_MSG(extack,
5918 "Router solicitation is disabled on device");
5919 return -EINVAL;
5920 }
5921
5922 write_lock_bh(&idev->lock);
5923
5924 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5925 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5926
5927 write_unlock_bh(&idev->lock);
5928
5929 clear_token = ipv6_addr_any(token);
5930 if (clear_token)
5931 goto update_lft;
5932
5933 if (!idev->dead && (idev->if_flags & IF_READY) &&
5934 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5935 IFA_F_OPTIMISTIC)) {
5936 /* If we're not ready, then normal ifup will take care
5937 * of this. Otherwise, we need to request our rs here.
5938 */
5939 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5940 update_rs = true;
5941 }
5942
5943update_lft:
5944 write_lock_bh(&idev->lock);
5945
5946 if (update_rs) {
5947 idev->if_flags |= IF_RS_SENT;
5948 idev->rs_interval = rfc3315_s14_backoff_init(
5949 READ_ONCE(idev->cnf.rtr_solicit_interval));
5950 idev->rs_probes = 1;
5951 addrconf_mod_rs_timer(idev, idev->rs_interval);
5952 }
5953
5954 /* Well, that's kinda nasty ... */
5955 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5956 spin_lock(&ifp->lock);
5957 if (ifp->tokenized) {
5958 ifp->valid_lft = 0;
5959 ifp->prefered_lft = 0;
5960 }
5961 spin_unlock(&ifp->lock);
5962 }
5963
5964 write_unlock_bh(&idev->lock);
5965 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5966 addrconf_verify_rtnl(dev_net(dev));
5967 return 0;
5968}
5969
5970static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5971 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5972 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5973 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT,
5974 .reject_message =
5975 "IFLA_INET6_RA_MTU can not be set" },
5976};
5977
5978static int check_addr_gen_mode(int mode)
5979{
5980 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5981 mode != IN6_ADDR_GEN_MODE_NONE &&
5982 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5983 mode != IN6_ADDR_GEN_MODE_RANDOM)
5984 return -EINVAL;
5985 return 1;
5986}
5987
5988static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5989 int mode)
5990{
5991 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5992 !idev->cnf.stable_secret.initialized &&
5993 !net->ipv6.devconf_dflt->stable_secret.initialized)
5994 return -EINVAL;
5995 return 1;
5996}
5997
5998static int inet6_validate_link_af(const struct net_device *dev,
5999 const struct nlattr *nla,
6000 struct netlink_ext_ack *extack)
6001{
6002 struct nlattr *tb[IFLA_INET6_MAX + 1];
6003 struct inet6_dev *idev = NULL;
6004 int err;
6005
6006 if (dev) {
6007 idev = __in6_dev_get(dev);
6008 if (!idev)
6009 return -EAFNOSUPPORT;
6010 }
6011
6012 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
6013 inet6_af_policy, extack);
6014 if (err)
6015 return err;
6016
6017 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
6018 return -EINVAL;
6019
6020 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
6021 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
6022
6023 if (check_addr_gen_mode(mode) < 0)
6024 return -EINVAL;
6025 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
6026 return -EINVAL;
6027 }
6028
6029 return 0;
6030}
6031
6032static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
6033 struct netlink_ext_ack *extack)
6034{
6035 struct inet6_dev *idev = __in6_dev_get(dev);
6036 struct nlattr *tb[IFLA_INET6_MAX + 1];
6037 int err;
6038
6039 if (!idev)
6040 return -EAFNOSUPPORT;
6041
6042 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
6043 return -EINVAL;
6044
6045 if (tb[IFLA_INET6_TOKEN]) {
6046 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
6047 extack);
6048 if (err)
6049 return err;
6050 }
6051
6052 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
6053 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
6054
6055 WRITE_ONCE(idev->cnf.addr_gen_mode, mode);
6056 }
6057
6058 return 0;
6059}
6060
6061static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
6062 u32 portid, u32 seq, int event, unsigned int flags)
6063{
6064 struct net_device *dev = idev->dev;
6065 struct ifinfomsg *hdr;
6066 struct nlmsghdr *nlh;
6067 int ifindex, iflink;
6068 void *protoinfo;
6069
6070 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
6071 if (!nlh)
6072 return -EMSGSIZE;
6073
6074 hdr = nlmsg_data(nlh);
6075 hdr->ifi_family = AF_INET6;
6076 hdr->__ifi_pad = 0;
6077 hdr->ifi_type = dev->type;
6078 ifindex = READ_ONCE(dev->ifindex);
6079 hdr->ifi_index = ifindex;
6080 hdr->ifi_flags = dev_get_flags(dev);
6081 hdr->ifi_change = 0;
6082
6083 iflink = dev_get_iflink(dev);
6084 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
6085 (dev->addr_len &&
6086 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
6087 nla_put_u32(skb, IFLA_MTU, READ_ONCE(dev->mtu)) ||
6088 (ifindex != iflink &&
6089 nla_put_u32(skb, IFLA_LINK, iflink)) ||
6090 nla_put_u8(skb, IFLA_OPERSTATE,
6091 netif_running(dev) ? READ_ONCE(dev->operstate) : IF_OPER_DOWN))
6092 goto nla_put_failure;
6093 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
6094 if (!protoinfo)
6095 goto nla_put_failure;
6096
6097 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
6098 goto nla_put_failure;
6099
6100 nla_nest_end(skb, protoinfo);
6101 nlmsg_end(skb, nlh);
6102 return 0;
6103
6104nla_put_failure:
6105 nlmsg_cancel(skb, nlh);
6106 return -EMSGSIZE;
6107}
6108
6109static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
6110 struct netlink_ext_ack *extack)
6111{
6112 struct ifinfomsg *ifm;
6113
6114 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
6115 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
6116 return -EINVAL;
6117 }
6118
6119 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
6120 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
6121 return -EINVAL;
6122 }
6123
6124 ifm = nlmsg_data(nlh);
6125 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
6126 ifm->ifi_change || ifm->ifi_index) {
6127 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
6128 return -EINVAL;
6129 }
6130
6131 return 0;
6132}
6133
6134static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
6135{
6136 struct net *net = sock_net(skb->sk);
6137 struct {
6138 unsigned long ifindex;
6139 } *ctx = (void *)cb->ctx;
6140 struct net_device *dev;
6141 struct inet6_dev *idev;
6142 int err;
6143
6144 /* only requests using strict checking can pass data to
6145 * influence the dump
6146 */
6147 if (cb->strict_check) {
6148 err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
6149
6150 if (err < 0)
6151 return err;
6152 }
6153
6154 err = 0;
6155 rcu_read_lock();
6156 for_each_netdev_dump(net, dev, ctx->ifindex) {
6157 idev = __in6_dev_get(dev);
6158 if (!idev)
6159 continue;
6160 err = inet6_fill_ifinfo(skb, idev,
6161 NETLINK_CB(cb->skb).portid,
6162 cb->nlh->nlmsg_seq,
6163 RTM_NEWLINK, NLM_F_MULTI);
6164 if (err < 0)
6165 break;
6166 }
6167 rcu_read_unlock();
6168
6169 return err;
6170}
6171
6172void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
6173{
6174 struct sk_buff *skb;
6175 struct net *net = dev_net(idev->dev);
6176 int err = -ENOBUFS;
6177
6178 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
6179 if (!skb)
6180 goto errout;
6181
6182 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
6183 if (err < 0) {
6184 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
6185 WARN_ON(err == -EMSGSIZE);
6186 kfree_skb(skb);
6187 goto errout;
6188 }
6189 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
6190 return;
6191errout:
6192 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
6193}
6194
6195static inline size_t inet6_prefix_nlmsg_size(void)
6196{
6197 return NLMSG_ALIGN(sizeof(struct prefixmsg))
6198 + nla_total_size(sizeof(struct in6_addr))
6199 + nla_total_size(sizeof(struct prefix_cacheinfo));
6200}
6201
6202static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6203 struct prefix_info *pinfo, u32 portid, u32 seq,
6204 int event, unsigned int flags)
6205{
6206 struct prefixmsg *pmsg;
6207 struct nlmsghdr *nlh;
6208 struct prefix_cacheinfo ci;
6209
6210 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6211 if (!nlh)
6212 return -EMSGSIZE;
6213
6214 pmsg = nlmsg_data(nlh);
6215 pmsg->prefix_family = AF_INET6;
6216 pmsg->prefix_pad1 = 0;
6217 pmsg->prefix_pad2 = 0;
6218 pmsg->prefix_ifindex = idev->dev->ifindex;
6219 pmsg->prefix_len = pinfo->prefix_len;
6220 pmsg->prefix_type = pinfo->type;
6221 pmsg->prefix_pad3 = 0;
6222 pmsg->prefix_flags = pinfo->flags;
6223
6224 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6225 goto nla_put_failure;
6226 ci.preferred_time = ntohl(pinfo->prefered);
6227 ci.valid_time = ntohl(pinfo->valid);
6228 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6229 goto nla_put_failure;
6230 nlmsg_end(skb, nlh);
6231 return 0;
6232
6233nla_put_failure:
6234 nlmsg_cancel(skb, nlh);
6235 return -EMSGSIZE;
6236}
6237
6238static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6239 struct prefix_info *pinfo)
6240{
6241 struct sk_buff *skb;
6242 struct net *net = dev_net(idev->dev);
6243 int err = -ENOBUFS;
6244
6245 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6246 if (!skb)
6247 goto errout;
6248
6249 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6250 if (err < 0) {
6251 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6252 WARN_ON(err == -EMSGSIZE);
6253 kfree_skb(skb);
6254 goto errout;
6255 }
6256 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6257 return;
6258errout:
6259 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6260}
6261
6262static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6263{
6264 struct net *net = dev_net(ifp->idev->dev);
6265
6266 if (event)
6267 ASSERT_RTNL();
6268
6269 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6270
6271 switch (event) {
6272 case RTM_NEWADDR:
6273 /*
6274 * If the address was optimistic we inserted the route at the
6275 * start of our DAD process, so we don't need to do it again.
6276 * If the device was taken down in the middle of the DAD
6277 * cycle there is a race where we could get here without a
6278 * host route, so nothing to insert. That will be fixed when
6279 * the device is brought up.
6280 */
6281 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6282 ip6_ins_rt(net, ifp->rt);
6283 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6284 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6285 &ifp->addr, ifp->idev->dev->name);
6286 }
6287
6288 if (ifp->idev->cnf.forwarding)
6289 addrconf_join_anycast(ifp);
6290 if (!ipv6_addr_any(&ifp->peer_addr))
6291 addrconf_prefix_route(&ifp->peer_addr, 128,
6292 ifp->rt_priority, ifp->idev->dev,
6293 0, 0, GFP_ATOMIC);
6294 break;
6295 case RTM_DELADDR:
6296 if (ifp->idev->cnf.forwarding)
6297 addrconf_leave_anycast(ifp);
6298 addrconf_leave_solict(ifp->idev, &ifp->addr);
6299 if (!ipv6_addr_any(&ifp->peer_addr)) {
6300 struct fib6_info *rt;
6301
6302 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6303 ifp->idev->dev, 0, 0,
6304 false);
6305 if (rt)
6306 ip6_del_rt(net, rt, false);
6307 }
6308 if (ifp->rt) {
6309 ip6_del_rt(net, ifp->rt, false);
6310 ifp->rt = NULL;
6311 }
6312 rt_genid_bump_ipv6(net);
6313 break;
6314 }
6315 atomic_inc(&net->ipv6.dev_addr_genid);
6316}
6317
6318static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6319{
6320 if (likely(ifp->idev->dead == 0))
6321 __ipv6_ifa_notify(event, ifp);
6322}
6323
6324#ifdef CONFIG_SYSCTL
6325
6326static int addrconf_sysctl_forward(const struct ctl_table *ctl, int write,
6327 void *buffer, size_t *lenp, loff_t *ppos)
6328{
6329 int *valp = ctl->data;
6330 int val = *valp;
6331 loff_t pos = *ppos;
6332 struct ctl_table lctl;
6333 int ret;
6334
6335 /*
6336 * ctl->data points to idev->cnf.forwarding, we should
6337 * not modify it until we get the rtnl lock.
6338 */
6339 lctl = *ctl;
6340 lctl.data = &val;
6341
6342 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6343
6344 if (write)
6345 ret = addrconf_fixup_forwarding(ctl, valp, val);
6346 if (ret)
6347 *ppos = pos;
6348 return ret;
6349}
6350
6351static int addrconf_sysctl_mtu(const struct ctl_table *ctl, int write,
6352 void *buffer, size_t *lenp, loff_t *ppos)
6353{
6354 struct inet6_dev *idev = ctl->extra1;
6355 int min_mtu = IPV6_MIN_MTU;
6356 struct ctl_table lctl;
6357
6358 lctl = *ctl;
6359 lctl.extra1 = &min_mtu;
6360 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6361
6362 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6363}
6364
6365static void dev_disable_change(struct inet6_dev *idev)
6366{
6367 struct netdev_notifier_info info;
6368
6369 if (!idev || !idev->dev)
6370 return;
6371
6372 netdev_notifier_info_init(&info, idev->dev);
6373 if (idev->cnf.disable_ipv6)
6374 addrconf_notify(NULL, NETDEV_DOWN, &info);
6375 else
6376 addrconf_notify(NULL, NETDEV_UP, &info);
6377}
6378
6379static void addrconf_disable_change(struct net *net, __s32 newf)
6380{
6381 struct net_device *dev;
6382 struct inet6_dev *idev;
6383
6384 for_each_netdev(net, dev) {
6385 idev = __in6_dev_get(dev);
6386 if (idev) {
6387 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6388
6389 WRITE_ONCE(idev->cnf.disable_ipv6, newf);
6390 if (changed)
6391 dev_disable_change(idev);
6392 }
6393 }
6394}
6395
6396static int addrconf_disable_ipv6(const struct ctl_table *table, int *p, int newf)
6397{
6398 struct net *net = (struct net *)table->extra2;
6399 int old;
6400
6401 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6402 WRITE_ONCE(*p, newf);
6403 return 0;
6404 }
6405
6406 if (!rtnl_trylock())
6407 return restart_syscall();
6408
6409 old = *p;
6410 WRITE_ONCE(*p, newf);
6411
6412 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6413 WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf);
6414 addrconf_disable_change(net, newf);
6415 } else if ((!newf) ^ (!old))
6416 dev_disable_change((struct inet6_dev *)table->extra1);
6417
6418 rtnl_unlock();
6419 return 0;
6420}
6421
6422static int addrconf_sysctl_disable(const struct ctl_table *ctl, int write,
6423 void *buffer, size_t *lenp, loff_t *ppos)
6424{
6425 int *valp = ctl->data;
6426 int val = *valp;
6427 loff_t pos = *ppos;
6428 struct ctl_table lctl;
6429 int ret;
6430
6431 /*
6432 * ctl->data points to idev->cnf.disable_ipv6, we should
6433 * not modify it until we get the rtnl lock.
6434 */
6435 lctl = *ctl;
6436 lctl.data = &val;
6437
6438 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6439
6440 if (write)
6441 ret = addrconf_disable_ipv6(ctl, valp, val);
6442 if (ret)
6443 *ppos = pos;
6444 return ret;
6445}
6446
6447static int addrconf_sysctl_proxy_ndp(const struct ctl_table *ctl, int write,
6448 void *buffer, size_t *lenp, loff_t *ppos)
6449{
6450 int *valp = ctl->data;
6451 int ret;
6452 int old, new;
6453
6454 old = *valp;
6455 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6456 new = *valp;
6457
6458 if (write && old != new) {
6459 struct net *net = ctl->extra2;
6460
6461 if (!rtnl_trylock())
6462 return restart_syscall();
6463
6464 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6465 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6466 NETCONFA_PROXY_NEIGH,
6467 NETCONFA_IFINDEX_DEFAULT,
6468 net->ipv6.devconf_dflt);
6469 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6470 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6471 NETCONFA_PROXY_NEIGH,
6472 NETCONFA_IFINDEX_ALL,
6473 net->ipv6.devconf_all);
6474 else {
6475 struct inet6_dev *idev = ctl->extra1;
6476
6477 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6478 NETCONFA_PROXY_NEIGH,
6479 idev->dev->ifindex,
6480 &idev->cnf);
6481 }
6482 rtnl_unlock();
6483 }
6484
6485 return ret;
6486}
6487
6488static int addrconf_sysctl_addr_gen_mode(const struct ctl_table *ctl, int write,
6489 void *buffer, size_t *lenp,
6490 loff_t *ppos)
6491{
6492 int ret = 0;
6493 u32 new_val;
6494 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6495 struct net *net = (struct net *)ctl->extra2;
6496 struct ctl_table tmp = {
6497 .data = &new_val,
6498 .maxlen = sizeof(new_val),
6499 .mode = ctl->mode,
6500 };
6501
6502 if (!rtnl_trylock())
6503 return restart_syscall();
6504
6505 new_val = *((u32 *)ctl->data);
6506
6507 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6508 if (ret != 0)
6509 goto out;
6510
6511 if (write) {
6512 if (check_addr_gen_mode(new_val) < 0) {
6513 ret = -EINVAL;
6514 goto out;
6515 }
6516
6517 if (idev) {
6518 if (check_stable_privacy(idev, net, new_val) < 0) {
6519 ret = -EINVAL;
6520 goto out;
6521 }
6522
6523 if (idev->cnf.addr_gen_mode != new_val) {
6524 WRITE_ONCE(idev->cnf.addr_gen_mode, new_val);
6525 addrconf_init_auto_addrs(idev->dev);
6526 }
6527 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6528 struct net_device *dev;
6529
6530 WRITE_ONCE(net->ipv6.devconf_dflt->addr_gen_mode, new_val);
6531 for_each_netdev(net, dev) {
6532 idev = __in6_dev_get(dev);
6533 if (idev &&
6534 idev->cnf.addr_gen_mode != new_val) {
6535 WRITE_ONCE(idev->cnf.addr_gen_mode,
6536 new_val);
6537 addrconf_init_auto_addrs(idev->dev);
6538 }
6539 }
6540 }
6541
6542 WRITE_ONCE(*((u32 *)ctl->data), new_val);
6543 }
6544
6545out:
6546 rtnl_unlock();
6547
6548 return ret;
6549}
6550
6551static int addrconf_sysctl_stable_secret(const struct ctl_table *ctl, int write,
6552 void *buffer, size_t *lenp,
6553 loff_t *ppos)
6554{
6555 int err;
6556 struct in6_addr addr;
6557 char str[IPV6_MAX_STRLEN];
6558 struct ctl_table lctl = *ctl;
6559 struct net *net = ctl->extra2;
6560 struct ipv6_stable_secret *secret = ctl->data;
6561
6562 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6563 return -EIO;
6564
6565 lctl.maxlen = IPV6_MAX_STRLEN;
6566 lctl.data = str;
6567
6568 if (!rtnl_trylock())
6569 return restart_syscall();
6570
6571 if (!write && !secret->initialized) {
6572 err = -EIO;
6573 goto out;
6574 }
6575
6576 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6577 if (err >= sizeof(str)) {
6578 err = -EIO;
6579 goto out;
6580 }
6581
6582 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6583 if (err || !write)
6584 goto out;
6585
6586 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6587 err = -EIO;
6588 goto out;
6589 }
6590
6591 secret->initialized = true;
6592 secret->secret = addr;
6593
6594 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6595 struct net_device *dev;
6596
6597 for_each_netdev(net, dev) {
6598 struct inet6_dev *idev = __in6_dev_get(dev);
6599
6600 if (idev) {
6601 WRITE_ONCE(idev->cnf.addr_gen_mode,
6602 IN6_ADDR_GEN_MODE_STABLE_PRIVACY);
6603 }
6604 }
6605 } else {
6606 struct inet6_dev *idev = ctl->extra1;
6607
6608 WRITE_ONCE(idev->cnf.addr_gen_mode,
6609 IN6_ADDR_GEN_MODE_STABLE_PRIVACY);
6610 }
6611
6612out:
6613 rtnl_unlock();
6614
6615 return err;
6616}
6617
6618static
6619int addrconf_sysctl_ignore_routes_with_linkdown(const struct ctl_table *ctl,
6620 int write, void *buffer,
6621 size_t *lenp,
6622 loff_t *ppos)
6623{
6624 int *valp = ctl->data;
6625 int val = *valp;
6626 loff_t pos = *ppos;
6627 struct ctl_table lctl;
6628 int ret;
6629
6630 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6631 * we should not modify it until we get the rtnl lock.
6632 */
6633 lctl = *ctl;
6634 lctl.data = &val;
6635
6636 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6637
6638 if (write)
6639 ret = addrconf_fixup_linkdown(ctl, valp, val);
6640 if (ret)
6641 *ppos = pos;
6642 return ret;
6643}
6644
6645static
6646void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6647{
6648 if (rt) {
6649 if (action)
6650 rt->dst.flags |= DST_NOPOLICY;
6651 else
6652 rt->dst.flags &= ~DST_NOPOLICY;
6653 }
6654}
6655
6656static
6657void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6658{
6659 struct inet6_ifaddr *ifa;
6660
6661 read_lock_bh(&idev->lock);
6662 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6663 spin_lock(&ifa->lock);
6664 if (ifa->rt) {
6665 /* host routes only use builtin fib6_nh */
6666 struct fib6_nh *nh = ifa->rt->fib6_nh;
6667 int cpu;
6668
6669 rcu_read_lock();
6670 ifa->rt->dst_nopolicy = val ? true : false;
6671 if (nh->rt6i_pcpu) {
6672 for_each_possible_cpu(cpu) {
6673 struct rt6_info **rtp;
6674
6675 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6676 addrconf_set_nopolicy(*rtp, val);
6677 }
6678 }
6679 rcu_read_unlock();
6680 }
6681 spin_unlock(&ifa->lock);
6682 }
6683 read_unlock_bh(&idev->lock);
6684}
6685
6686static
6687int addrconf_disable_policy(const struct ctl_table *ctl, int *valp, int val)
6688{
6689 struct net *net = (struct net *)ctl->extra2;
6690 struct inet6_dev *idev;
6691
6692 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6693 WRITE_ONCE(*valp, val);
6694 return 0;
6695 }
6696
6697 if (!rtnl_trylock())
6698 return restart_syscall();
6699
6700 WRITE_ONCE(*valp, val);
6701
6702 if (valp == &net->ipv6.devconf_all->disable_policy) {
6703 struct net_device *dev;
6704
6705 for_each_netdev(net, dev) {
6706 idev = __in6_dev_get(dev);
6707 if (idev)
6708 addrconf_disable_policy_idev(idev, val);
6709 }
6710 } else {
6711 idev = (struct inet6_dev *)ctl->extra1;
6712 addrconf_disable_policy_idev(idev, val);
6713 }
6714
6715 rtnl_unlock();
6716 return 0;
6717}
6718
6719static int addrconf_sysctl_disable_policy(const struct ctl_table *ctl, int write,
6720 void *buffer, size_t *lenp, loff_t *ppos)
6721{
6722 int *valp = ctl->data;
6723 int val = *valp;
6724 loff_t pos = *ppos;
6725 struct ctl_table lctl;
6726 int ret;
6727
6728 lctl = *ctl;
6729 lctl.data = &val;
6730 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6731
6732 if (write && (*valp != val))
6733 ret = addrconf_disable_policy(ctl, valp, val);
6734
6735 if (ret)
6736 *ppos = pos;
6737
6738 return ret;
6739}
6740
6741static int minus_one = -1;
6742static const int two_five_five = 255;
6743static u32 ioam6_if_id_max = U16_MAX;
6744
6745static const struct ctl_table addrconf_sysctl[] = {
6746 {
6747 .procname = "forwarding",
6748 .data = &ipv6_devconf.forwarding,
6749 .maxlen = sizeof(int),
6750 .mode = 0644,
6751 .proc_handler = addrconf_sysctl_forward,
6752 },
6753 {
6754 .procname = "hop_limit",
6755 .data = &ipv6_devconf.hop_limit,
6756 .maxlen = sizeof(int),
6757 .mode = 0644,
6758 .proc_handler = proc_dointvec_minmax,
6759 .extra1 = (void *)SYSCTL_ONE,
6760 .extra2 = (void *)&two_five_five,
6761 },
6762 {
6763 .procname = "mtu",
6764 .data = &ipv6_devconf.mtu6,
6765 .maxlen = sizeof(int),
6766 .mode = 0644,
6767 .proc_handler = addrconf_sysctl_mtu,
6768 },
6769 {
6770 .procname = "accept_ra",
6771 .data = &ipv6_devconf.accept_ra,
6772 .maxlen = sizeof(int),
6773 .mode = 0644,
6774 .proc_handler = proc_dointvec,
6775 },
6776 {
6777 .procname = "accept_redirects",
6778 .data = &ipv6_devconf.accept_redirects,
6779 .maxlen = sizeof(int),
6780 .mode = 0644,
6781 .proc_handler = proc_dointvec,
6782 },
6783 {
6784 .procname = "autoconf",
6785 .data = &ipv6_devconf.autoconf,
6786 .maxlen = sizeof(int),
6787 .mode = 0644,
6788 .proc_handler = proc_dointvec,
6789 },
6790 {
6791 .procname = "dad_transmits",
6792 .data = &ipv6_devconf.dad_transmits,
6793 .maxlen = sizeof(int),
6794 .mode = 0644,
6795 .proc_handler = proc_dointvec,
6796 },
6797 {
6798 .procname = "router_solicitations",
6799 .data = &ipv6_devconf.rtr_solicits,
6800 .maxlen = sizeof(int),
6801 .mode = 0644,
6802 .proc_handler = proc_dointvec_minmax,
6803 .extra1 = &minus_one,
6804 },
6805 {
6806 .procname = "router_solicitation_interval",
6807 .data = &ipv6_devconf.rtr_solicit_interval,
6808 .maxlen = sizeof(int),
6809 .mode = 0644,
6810 .proc_handler = proc_dointvec_jiffies,
6811 },
6812 {
6813 .procname = "router_solicitation_max_interval",
6814 .data = &ipv6_devconf.rtr_solicit_max_interval,
6815 .maxlen = sizeof(int),
6816 .mode = 0644,
6817 .proc_handler = proc_dointvec_jiffies,
6818 },
6819 {
6820 .procname = "router_solicitation_delay",
6821 .data = &ipv6_devconf.rtr_solicit_delay,
6822 .maxlen = sizeof(int),
6823 .mode = 0644,
6824 .proc_handler = proc_dointvec_jiffies,
6825 },
6826 {
6827 .procname = "force_mld_version",
6828 .data = &ipv6_devconf.force_mld_version,
6829 .maxlen = sizeof(int),
6830 .mode = 0644,
6831 .proc_handler = proc_dointvec,
6832 },
6833 {
6834 .procname = "mldv1_unsolicited_report_interval",
6835 .data =
6836 &ipv6_devconf.mldv1_unsolicited_report_interval,
6837 .maxlen = sizeof(int),
6838 .mode = 0644,
6839 .proc_handler = proc_dointvec_ms_jiffies,
6840 },
6841 {
6842 .procname = "mldv2_unsolicited_report_interval",
6843 .data =
6844 &ipv6_devconf.mldv2_unsolicited_report_interval,
6845 .maxlen = sizeof(int),
6846 .mode = 0644,
6847 .proc_handler = proc_dointvec_ms_jiffies,
6848 },
6849 {
6850 .procname = "use_tempaddr",
6851 .data = &ipv6_devconf.use_tempaddr,
6852 .maxlen = sizeof(int),
6853 .mode = 0644,
6854 .proc_handler = proc_dointvec,
6855 },
6856 {
6857 .procname = "temp_valid_lft",
6858 .data = &ipv6_devconf.temp_valid_lft,
6859 .maxlen = sizeof(int),
6860 .mode = 0644,
6861 .proc_handler = proc_dointvec,
6862 },
6863 {
6864 .procname = "temp_prefered_lft",
6865 .data = &ipv6_devconf.temp_prefered_lft,
6866 .maxlen = sizeof(int),
6867 .mode = 0644,
6868 .proc_handler = proc_dointvec,
6869 },
6870 {
6871 .procname = "regen_min_advance",
6872 .data = &ipv6_devconf.regen_min_advance,
6873 .maxlen = sizeof(int),
6874 .mode = 0644,
6875 .proc_handler = proc_dointvec,
6876 },
6877 {
6878 .procname = "regen_max_retry",
6879 .data = &ipv6_devconf.regen_max_retry,
6880 .maxlen = sizeof(int),
6881 .mode = 0644,
6882 .proc_handler = proc_dointvec,
6883 },
6884 {
6885 .procname = "max_desync_factor",
6886 .data = &ipv6_devconf.max_desync_factor,
6887 .maxlen = sizeof(int),
6888 .mode = 0644,
6889 .proc_handler = proc_dointvec,
6890 },
6891 {
6892 .procname = "max_addresses",
6893 .data = &ipv6_devconf.max_addresses,
6894 .maxlen = sizeof(int),
6895 .mode = 0644,
6896 .proc_handler = proc_dointvec,
6897 },
6898 {
6899 .procname = "accept_ra_defrtr",
6900 .data = &ipv6_devconf.accept_ra_defrtr,
6901 .maxlen = sizeof(int),
6902 .mode = 0644,
6903 .proc_handler = proc_dointvec,
6904 },
6905 {
6906 .procname = "ra_defrtr_metric",
6907 .data = &ipv6_devconf.ra_defrtr_metric,
6908 .maxlen = sizeof(u32),
6909 .mode = 0644,
6910 .proc_handler = proc_douintvec_minmax,
6911 .extra1 = (void *)SYSCTL_ONE,
6912 },
6913 {
6914 .procname = "accept_ra_min_hop_limit",
6915 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6916 .maxlen = sizeof(int),
6917 .mode = 0644,
6918 .proc_handler = proc_dointvec,
6919 },
6920 {
6921 .procname = "accept_ra_min_lft",
6922 .data = &ipv6_devconf.accept_ra_min_lft,
6923 .maxlen = sizeof(int),
6924 .mode = 0644,
6925 .proc_handler = proc_dointvec,
6926 },
6927 {
6928 .procname = "accept_ra_pinfo",
6929 .data = &ipv6_devconf.accept_ra_pinfo,
6930 .maxlen = sizeof(int),
6931 .mode = 0644,
6932 .proc_handler = proc_dointvec,
6933 },
6934 {
6935 .procname = "ra_honor_pio_life",
6936 .data = &ipv6_devconf.ra_honor_pio_life,
6937 .maxlen = sizeof(u8),
6938 .mode = 0644,
6939 .proc_handler = proc_dou8vec_minmax,
6940 .extra1 = SYSCTL_ZERO,
6941 .extra2 = SYSCTL_ONE,
6942 },
6943 {
6944 .procname = "ra_honor_pio_pflag",
6945 .data = &ipv6_devconf.ra_honor_pio_pflag,
6946 .maxlen = sizeof(u8),
6947 .mode = 0644,
6948 .proc_handler = proc_dou8vec_minmax,
6949 .extra1 = SYSCTL_ZERO,
6950 .extra2 = SYSCTL_ONE,
6951 },
6952#ifdef CONFIG_IPV6_ROUTER_PREF
6953 {
6954 .procname = "accept_ra_rtr_pref",
6955 .data = &ipv6_devconf.accept_ra_rtr_pref,
6956 .maxlen = sizeof(int),
6957 .mode = 0644,
6958 .proc_handler = proc_dointvec,
6959 },
6960 {
6961 .procname = "router_probe_interval",
6962 .data = &ipv6_devconf.rtr_probe_interval,
6963 .maxlen = sizeof(int),
6964 .mode = 0644,
6965 .proc_handler = proc_dointvec_jiffies,
6966 },
6967#ifdef CONFIG_IPV6_ROUTE_INFO
6968 {
6969 .procname = "accept_ra_rt_info_min_plen",
6970 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6971 .maxlen = sizeof(int),
6972 .mode = 0644,
6973 .proc_handler = proc_dointvec,
6974 },
6975 {
6976 .procname = "accept_ra_rt_info_max_plen",
6977 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6978 .maxlen = sizeof(int),
6979 .mode = 0644,
6980 .proc_handler = proc_dointvec,
6981 },
6982#endif
6983#endif
6984 {
6985 .procname = "proxy_ndp",
6986 .data = &ipv6_devconf.proxy_ndp,
6987 .maxlen = sizeof(int),
6988 .mode = 0644,
6989 .proc_handler = addrconf_sysctl_proxy_ndp,
6990 },
6991 {
6992 .procname = "accept_source_route",
6993 .data = &ipv6_devconf.accept_source_route,
6994 .maxlen = sizeof(int),
6995 .mode = 0644,
6996 .proc_handler = proc_dointvec,
6997 },
6998#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6999 {
7000 .procname = "optimistic_dad",
7001 .data = &ipv6_devconf.optimistic_dad,
7002 .maxlen = sizeof(int),
7003 .mode = 0644,
7004 .proc_handler = proc_dointvec,
7005 },
7006 {
7007 .procname = "use_optimistic",
7008 .data = &ipv6_devconf.use_optimistic,
7009 .maxlen = sizeof(int),
7010 .mode = 0644,
7011 .proc_handler = proc_dointvec,
7012 },
7013#endif
7014#ifdef CONFIG_IPV6_MROUTE
7015 {
7016 .procname = "mc_forwarding",
7017 .data = &ipv6_devconf.mc_forwarding,
7018 .maxlen = sizeof(int),
7019 .mode = 0444,
7020 .proc_handler = proc_dointvec,
7021 },
7022#endif
7023 {
7024 .procname = "disable_ipv6",
7025 .data = &ipv6_devconf.disable_ipv6,
7026 .maxlen = sizeof(int),
7027 .mode = 0644,
7028 .proc_handler = addrconf_sysctl_disable,
7029 },
7030 {
7031 .procname = "accept_dad",
7032 .data = &ipv6_devconf.accept_dad,
7033 .maxlen = sizeof(int),
7034 .mode = 0644,
7035 .proc_handler = proc_dointvec,
7036 },
7037 {
7038 .procname = "force_tllao",
7039 .data = &ipv6_devconf.force_tllao,
7040 .maxlen = sizeof(int),
7041 .mode = 0644,
7042 .proc_handler = proc_dointvec
7043 },
7044 {
7045 .procname = "ndisc_notify",
7046 .data = &ipv6_devconf.ndisc_notify,
7047 .maxlen = sizeof(int),
7048 .mode = 0644,
7049 .proc_handler = proc_dointvec
7050 },
7051 {
7052 .procname = "suppress_frag_ndisc",
7053 .data = &ipv6_devconf.suppress_frag_ndisc,
7054 .maxlen = sizeof(int),
7055 .mode = 0644,
7056 .proc_handler = proc_dointvec
7057 },
7058 {
7059 .procname = "accept_ra_from_local",
7060 .data = &ipv6_devconf.accept_ra_from_local,
7061 .maxlen = sizeof(int),
7062 .mode = 0644,
7063 .proc_handler = proc_dointvec,
7064 },
7065 {
7066 .procname = "accept_ra_mtu",
7067 .data = &ipv6_devconf.accept_ra_mtu,
7068 .maxlen = sizeof(int),
7069 .mode = 0644,
7070 .proc_handler = proc_dointvec,
7071 },
7072 {
7073 .procname = "stable_secret",
7074 .data = &ipv6_devconf.stable_secret,
7075 .maxlen = IPV6_MAX_STRLEN,
7076 .mode = 0600,
7077 .proc_handler = addrconf_sysctl_stable_secret,
7078 },
7079 {
7080 .procname = "use_oif_addrs_only",
7081 .data = &ipv6_devconf.use_oif_addrs_only,
7082 .maxlen = sizeof(int),
7083 .mode = 0644,
7084 .proc_handler = proc_dointvec,
7085 },
7086 {
7087 .procname = "ignore_routes_with_linkdown",
7088 .data = &ipv6_devconf.ignore_routes_with_linkdown,
7089 .maxlen = sizeof(int),
7090 .mode = 0644,
7091 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
7092 },
7093 {
7094 .procname = "drop_unicast_in_l2_multicast",
7095 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
7096 .maxlen = sizeof(int),
7097 .mode = 0644,
7098 .proc_handler = proc_dointvec,
7099 },
7100 {
7101 .procname = "drop_unsolicited_na",
7102 .data = &ipv6_devconf.drop_unsolicited_na,
7103 .maxlen = sizeof(int),
7104 .mode = 0644,
7105 .proc_handler = proc_dointvec,
7106 },
7107 {
7108 .procname = "keep_addr_on_down",
7109 .data = &ipv6_devconf.keep_addr_on_down,
7110 .maxlen = sizeof(int),
7111 .mode = 0644,
7112 .proc_handler = proc_dointvec,
7113
7114 },
7115 {
7116 .procname = "seg6_enabled",
7117 .data = &ipv6_devconf.seg6_enabled,
7118 .maxlen = sizeof(int),
7119 .mode = 0644,
7120 .proc_handler = proc_dointvec,
7121 },
7122#ifdef CONFIG_IPV6_SEG6_HMAC
7123 {
7124 .procname = "seg6_require_hmac",
7125 .data = &ipv6_devconf.seg6_require_hmac,
7126 .maxlen = sizeof(int),
7127 .mode = 0644,
7128 .proc_handler = proc_dointvec,
7129 },
7130#endif
7131 {
7132 .procname = "enhanced_dad",
7133 .data = &ipv6_devconf.enhanced_dad,
7134 .maxlen = sizeof(int),
7135 .mode = 0644,
7136 .proc_handler = proc_dointvec,
7137 },
7138 {
7139 .procname = "addr_gen_mode",
7140 .data = &ipv6_devconf.addr_gen_mode,
7141 .maxlen = sizeof(int),
7142 .mode = 0644,
7143 .proc_handler = addrconf_sysctl_addr_gen_mode,
7144 },
7145 {
7146 .procname = "disable_policy",
7147 .data = &ipv6_devconf.disable_policy,
7148 .maxlen = sizeof(int),
7149 .mode = 0644,
7150 .proc_handler = addrconf_sysctl_disable_policy,
7151 },
7152 {
7153 .procname = "ndisc_tclass",
7154 .data = &ipv6_devconf.ndisc_tclass,
7155 .maxlen = sizeof(int),
7156 .mode = 0644,
7157 .proc_handler = proc_dointvec_minmax,
7158 .extra1 = (void *)SYSCTL_ZERO,
7159 .extra2 = (void *)&two_five_five,
7160 },
7161 {
7162 .procname = "rpl_seg_enabled",
7163 .data = &ipv6_devconf.rpl_seg_enabled,
7164 .maxlen = sizeof(int),
7165 .mode = 0644,
7166 .proc_handler = proc_dointvec,
7167 },
7168 {
7169 .procname = "ioam6_enabled",
7170 .data = &ipv6_devconf.ioam6_enabled,
7171 .maxlen = sizeof(u8),
7172 .mode = 0644,
7173 .proc_handler = proc_dou8vec_minmax,
7174 .extra1 = (void *)SYSCTL_ZERO,
7175 .extra2 = (void *)SYSCTL_ONE,
7176 },
7177 {
7178 .procname = "ioam6_id",
7179 .data = &ipv6_devconf.ioam6_id,
7180 .maxlen = sizeof(u32),
7181 .mode = 0644,
7182 .proc_handler = proc_douintvec_minmax,
7183 .extra1 = (void *)SYSCTL_ZERO,
7184 .extra2 = (void *)&ioam6_if_id_max,
7185 },
7186 {
7187 .procname = "ioam6_id_wide",
7188 .data = &ipv6_devconf.ioam6_id_wide,
7189 .maxlen = sizeof(u32),
7190 .mode = 0644,
7191 .proc_handler = proc_douintvec,
7192 },
7193 {
7194 .procname = "ndisc_evict_nocarrier",
7195 .data = &ipv6_devconf.ndisc_evict_nocarrier,
7196 .maxlen = sizeof(u8),
7197 .mode = 0644,
7198 .proc_handler = proc_dou8vec_minmax,
7199 .extra1 = (void *)SYSCTL_ZERO,
7200 .extra2 = (void *)SYSCTL_ONE,
7201 },
7202 {
7203 .procname = "accept_untracked_na",
7204 .data = &ipv6_devconf.accept_untracked_na,
7205 .maxlen = sizeof(int),
7206 .mode = 0644,
7207 .proc_handler = proc_dointvec_minmax,
7208 .extra1 = SYSCTL_ZERO,
7209 .extra2 = SYSCTL_TWO,
7210 },
7211};
7212
7213static int __addrconf_sysctl_register(struct net *net, char *dev_name,
7214 struct inet6_dev *idev, struct ipv6_devconf *p)
7215{
7216 size_t table_size = ARRAY_SIZE(addrconf_sysctl);
7217 int i, ifindex;
7218 struct ctl_table *table;
7219 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
7220
7221 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT);
7222 if (!table)
7223 goto out;
7224
7225 for (i = 0; i < table_size; i++) {
7226 table[i].data += (char *)p - (char *)&ipv6_devconf;
7227 /* If one of these is already set, then it is not safe to
7228 * overwrite either of them: this makes proc_dointvec_minmax
7229 * usable.
7230 */
7231 if (!table[i].extra1 && !table[i].extra2) {
7232 table[i].extra1 = idev; /* embedded; no ref */
7233 table[i].extra2 = net;
7234 }
7235 }
7236
7237 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
7238
7239 p->sysctl_header = register_net_sysctl_sz(net, path, table,
7240 table_size);
7241 if (!p->sysctl_header)
7242 goto free;
7243
7244 if (!strcmp(dev_name, "all"))
7245 ifindex = NETCONFA_IFINDEX_ALL;
7246 else if (!strcmp(dev_name, "default"))
7247 ifindex = NETCONFA_IFINDEX_DEFAULT;
7248 else
7249 ifindex = idev->dev->ifindex;
7250 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7251 ifindex, p);
7252 return 0;
7253
7254free:
7255 kfree(table);
7256out:
7257 return -ENOBUFS;
7258}
7259
7260static void __addrconf_sysctl_unregister(struct net *net,
7261 struct ipv6_devconf *p, int ifindex)
7262{
7263 const struct ctl_table *table;
7264
7265 if (!p->sysctl_header)
7266 return;
7267
7268 table = p->sysctl_header->ctl_table_arg;
7269 unregister_net_sysctl_table(p->sysctl_header);
7270 p->sysctl_header = NULL;
7271 kfree(table);
7272
7273 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
7274}
7275
7276static int addrconf_sysctl_register(struct inet6_dev *idev)
7277{
7278 int err;
7279
7280 if (!sysctl_dev_name_is_allowed(idev->dev->name))
7281 return -EINVAL;
7282
7283 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7284 &ndisc_ifinfo_sysctl_change);
7285 if (err)
7286 return err;
7287 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7288 idev, &idev->cnf);
7289 if (err)
7290 neigh_sysctl_unregister(idev->nd_parms);
7291
7292 return err;
7293}
7294
7295static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7296{
7297 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7298 idev->dev->ifindex);
7299 neigh_sysctl_unregister(idev->nd_parms);
7300}
7301
7302
7303#endif
7304
7305static int __net_init addrconf_init_net(struct net *net)
7306{
7307 int err = -ENOMEM;
7308 struct ipv6_devconf *all, *dflt;
7309
7310 spin_lock_init(&net->ipv6.addrconf_hash_lock);
7311 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work);
7312 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE,
7313 sizeof(struct hlist_head),
7314 GFP_KERNEL);
7315 if (!net->ipv6.inet6_addr_lst)
7316 goto err_alloc_addr;
7317
7318 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7319 if (!all)
7320 goto err_alloc_all;
7321
7322 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7323 if (!dflt)
7324 goto err_alloc_dflt;
7325
7326 if (!net_eq(net, &init_net)) {
7327 switch (net_inherit_devconf()) {
7328 case 1: /* copy from init_net */
7329 memcpy(all, init_net.ipv6.devconf_all,
7330 sizeof(ipv6_devconf));
7331 memcpy(dflt, init_net.ipv6.devconf_dflt,
7332 sizeof(ipv6_devconf_dflt));
7333 break;
7334 case 3: /* copy from the current netns */
7335 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7336 sizeof(ipv6_devconf));
7337 memcpy(dflt,
7338 current->nsproxy->net_ns->ipv6.devconf_dflt,
7339 sizeof(ipv6_devconf_dflt));
7340 break;
7341 case 0:
7342 case 2:
7343 /* use compiled values */
7344 break;
7345 }
7346 }
7347
7348 /* these will be inherited by all namespaces */
7349 dflt->autoconf = ipv6_defaults.autoconf;
7350 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7351
7352 dflt->stable_secret.initialized = false;
7353 all->stable_secret.initialized = false;
7354
7355 net->ipv6.devconf_all = all;
7356 net->ipv6.devconf_dflt = dflt;
7357
7358#ifdef CONFIG_SYSCTL
7359 err = __addrconf_sysctl_register(net, "all", NULL, all);
7360 if (err < 0)
7361 goto err_reg_all;
7362
7363 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7364 if (err < 0)
7365 goto err_reg_dflt;
7366#endif
7367 return 0;
7368
7369#ifdef CONFIG_SYSCTL
7370err_reg_dflt:
7371 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7372err_reg_all:
7373 kfree(dflt);
7374 net->ipv6.devconf_dflt = NULL;
7375#endif
7376err_alloc_dflt:
7377 kfree(all);
7378 net->ipv6.devconf_all = NULL;
7379err_alloc_all:
7380 kfree(net->ipv6.inet6_addr_lst);
7381err_alloc_addr:
7382 return err;
7383}
7384
7385static void __net_exit addrconf_exit_net(struct net *net)
7386{
7387 int i;
7388
7389#ifdef CONFIG_SYSCTL
7390 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7391 NETCONFA_IFINDEX_DEFAULT);
7392 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7393 NETCONFA_IFINDEX_ALL);
7394#endif
7395 kfree(net->ipv6.devconf_dflt);
7396 net->ipv6.devconf_dflt = NULL;
7397 kfree(net->ipv6.devconf_all);
7398 net->ipv6.devconf_all = NULL;
7399
7400 cancel_delayed_work_sync(&net->ipv6.addr_chk_work);
7401 /*
7402 * Check hash table, then free it.
7403 */
7404 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7405 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i]));
7406
7407 kfree(net->ipv6.inet6_addr_lst);
7408 net->ipv6.inet6_addr_lst = NULL;
7409}
7410
7411static struct pernet_operations addrconf_ops = {
7412 .init = addrconf_init_net,
7413 .exit = addrconf_exit_net,
7414};
7415
7416static struct rtnl_af_ops inet6_ops __read_mostly = {
7417 .family = AF_INET6,
7418 .fill_link_af = inet6_fill_link_af,
7419 .get_link_af_size = inet6_get_link_af_size,
7420 .validate_link_af = inet6_validate_link_af,
7421 .set_link_af = inet6_set_link_af,
7422};
7423
7424static const struct rtnl_msg_handler addrconf_rtnl_msg_handlers[] __initconst_or_module = {
7425 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETLINK,
7426 .dumpit = inet6_dump_ifinfo, .flags = RTNL_FLAG_DUMP_UNLOCKED},
7427 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_NEWADDR,
7428 .doit = inet6_rtm_newaddr},
7429 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_DELADDR,
7430 .doit = inet6_rtm_deladdr},
7431 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETADDR,
7432 .doit = inet6_rtm_getaddr, .dumpit = inet6_dump_ifaddr,
7433 .flags = RTNL_FLAG_DOIT_UNLOCKED | RTNL_FLAG_DUMP_UNLOCKED},
7434 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETMULTICAST,
7435 .dumpit = inet6_dump_ifmcaddr,
7436 .flags = RTNL_FLAG_DUMP_UNLOCKED},
7437 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETANYCAST,
7438 .dumpit = inet6_dump_ifacaddr,
7439 .flags = RTNL_FLAG_DUMP_UNLOCKED},
7440 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETNETCONF,
7441 .doit = inet6_netconf_get_devconf, .dumpit = inet6_netconf_dump_devconf,
7442 .flags = RTNL_FLAG_DOIT_UNLOCKED | RTNL_FLAG_DUMP_UNLOCKED},
7443};
7444
7445/*
7446 * Init / cleanup code
7447 */
7448
7449int __init addrconf_init(void)
7450{
7451 struct inet6_dev *idev;
7452 int err;
7453
7454 err = ipv6_addr_label_init();
7455 if (err < 0) {
7456 pr_crit("%s: cannot initialize default policy table: %d\n",
7457 __func__, err);
7458 goto out;
7459 }
7460
7461 err = register_pernet_subsys(&addrconf_ops);
7462 if (err < 0)
7463 goto out_addrlabel;
7464
7465 /* All works using addrconf_wq need to lock rtnl. */
7466 addrconf_wq = create_singlethread_workqueue("ipv6_addrconf");
7467 if (!addrconf_wq) {
7468 err = -ENOMEM;
7469 goto out_nowq;
7470 }
7471
7472 rtnl_lock();
7473 idev = ipv6_add_dev(blackhole_netdev);
7474 rtnl_unlock();
7475 if (IS_ERR(idev)) {
7476 err = PTR_ERR(idev);
7477 goto errlo;
7478 }
7479
7480 ip6_route_init_special_entries();
7481
7482 register_netdevice_notifier(&ipv6_dev_notf);
7483
7484 addrconf_verify(&init_net);
7485
7486 err = rtnl_af_register(&inet6_ops);
7487 if (err)
7488 goto erraf;
7489
7490 err = rtnl_register_many(addrconf_rtnl_msg_handlers);
7491 if (err)
7492 goto errout;
7493
7494 err = ipv6_addr_label_rtnl_register();
7495 if (err < 0)
7496 goto errout;
7497
7498 return 0;
7499errout:
7500 rtnl_unregister_all(PF_INET6);
7501 rtnl_af_unregister(&inet6_ops);
7502erraf:
7503 unregister_netdevice_notifier(&ipv6_dev_notf);
7504errlo:
7505 destroy_workqueue(addrconf_wq);
7506out_nowq:
7507 unregister_pernet_subsys(&addrconf_ops);
7508out_addrlabel:
7509 ipv6_addr_label_cleanup();
7510out:
7511 return err;
7512}
7513
7514void addrconf_cleanup(void)
7515{
7516 struct net_device *dev;
7517
7518 unregister_netdevice_notifier(&ipv6_dev_notf);
7519 unregister_pernet_subsys(&addrconf_ops);
7520 ipv6_addr_label_cleanup();
7521
7522 rtnl_af_unregister(&inet6_ops);
7523
7524 rtnl_lock();
7525
7526 /* clean dev list */
7527 for_each_netdev(&init_net, dev) {
7528 if (__in6_dev_get(dev) == NULL)
7529 continue;
7530 addrconf_ifdown(dev, true);
7531 }
7532 addrconf_ifdown(init_net.loopback_dev, true);
7533
7534 rtnl_unlock();
7535
7536 destroy_workqueue(addrconf_wq);
7537}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * IPv6 Address [auto]configuration
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
9 */
10
11/*
12 * Changes:
13 *
14 * Janos Farkas : delete timer on ifdown
15 * <chexum@bankinf.banki.hu>
16 * Andi Kleen : kill double kfree on module
17 * unload.
18 * Maciej W. Rozycki : FDDI support
19 * sekiya@USAGI : Don't send too many RS
20 * packets.
21 * yoshfuji@USAGI : Fixed interval between DAD
22 * packets.
23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
24 * address validation timer.
25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
26 * support.
27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
28 * address on a same interface.
29 * YOSHIFUJI Hideaki @USAGI : ARCnet support
30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
31 * seq_file.
32 * YOSHIFUJI Hideaki @USAGI : improved source address
33 * selection; consider scope,
34 * status etc.
35 */
36
37#define pr_fmt(fmt) "IPv6: " fmt
38
39#include <linux/errno.h>
40#include <linux/types.h>
41#include <linux/kernel.h>
42#include <linux/sched/signal.h>
43#include <linux/socket.h>
44#include <linux/sockios.h>
45#include <linux/net.h>
46#include <linux/inet.h>
47#include <linux/in6.h>
48#include <linux/netdevice.h>
49#include <linux/if_addr.h>
50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
56#include <linux/slab.h>
57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
60#include <linux/capability.h>
61#include <linux/delay.h>
62#include <linux/notifier.h>
63#include <linux/string.h>
64#include <linux/hash.h>
65
66#include <net/net_namespace.h>
67#include <net/sock.h>
68#include <net/snmp.h>
69
70#include <net/6lowpan.h>
71#include <net/firewire.h>
72#include <net/ipv6.h>
73#include <net/protocol.h>
74#include <net/ndisc.h>
75#include <net/ip6_route.h>
76#include <net/addrconf.h>
77#include <net/tcp.h>
78#include <net/ip.h>
79#include <net/netlink.h>
80#include <net/pkt_sched.h>
81#include <net/l3mdev.h>
82#include <linux/if_tunnel.h>
83#include <linux/rtnetlink.h>
84#include <linux/netconf.h>
85#include <linux/random.h>
86#include <linux/uaccess.h>
87#include <asm/unaligned.h>
88
89#include <linux/proc_fs.h>
90#include <linux/seq_file.h>
91#include <linux/export.h>
92#include <linux/ioam6.h>
93
94#define INFINITY_LIFE_TIME 0xFFFFFFFF
95
96#define IPV6_MAX_STRLEN \
97 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
98
99static inline u32 cstamp_delta(unsigned long cstamp)
100{
101 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
102}
103
104static inline s32 rfc3315_s14_backoff_init(s32 irt)
105{
106 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
107 u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt;
108 do_div(tmp, 1000000);
109 return (s32)tmp;
110}
111
112static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
113{
114 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
115 u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt;
116 do_div(tmp, 1000000);
117 if ((s32)tmp > mrt) {
118 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
119 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt;
120 do_div(tmp, 1000000);
121 }
122 return (s32)tmp;
123}
124
125#ifdef CONFIG_SYSCTL
126static int addrconf_sysctl_register(struct inet6_dev *idev);
127static void addrconf_sysctl_unregister(struct inet6_dev *idev);
128#else
129static inline int addrconf_sysctl_register(struct inet6_dev *idev)
130{
131 return 0;
132}
133
134static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
135{
136}
137#endif
138
139static void ipv6_gen_rnd_iid(struct in6_addr *addr);
140
141static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
142static int ipv6_count_addresses(const struct inet6_dev *idev);
143static int ipv6_generate_stable_address(struct in6_addr *addr,
144 u8 dad_count,
145 const struct inet6_dev *idev);
146
147#define IN6_ADDR_HSIZE_SHIFT 8
148#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
149
150static void addrconf_verify(struct net *net);
151static void addrconf_verify_rtnl(struct net *net);
152
153static struct workqueue_struct *addrconf_wq;
154
155static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
156static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
157
158static void addrconf_type_change(struct net_device *dev,
159 unsigned long event);
160static int addrconf_ifdown(struct net_device *dev, bool unregister);
161
162static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
163 int plen,
164 const struct net_device *dev,
165 u32 flags, u32 noflags,
166 bool no_gw);
167
168static void addrconf_dad_start(struct inet6_ifaddr *ifp);
169static void addrconf_dad_work(struct work_struct *w);
170static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
171 bool send_na);
172static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
173static void addrconf_rs_timer(struct timer_list *t);
174static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
175static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
176
177static void inet6_prefix_notify(int event, struct inet6_dev *idev,
178 struct prefix_info *pinfo);
179
180static struct ipv6_devconf ipv6_devconf __read_mostly = {
181 .forwarding = 0,
182 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
183 .mtu6 = IPV6_MIN_MTU,
184 .accept_ra = 1,
185 .accept_redirects = 1,
186 .autoconf = 1,
187 .force_mld_version = 0,
188 .mldv1_unsolicited_report_interval = 10 * HZ,
189 .mldv2_unsolicited_report_interval = HZ,
190 .dad_transmits = 1,
191 .rtr_solicits = MAX_RTR_SOLICITATIONS,
192 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
193 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
194 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
195 .use_tempaddr = 0,
196 .temp_valid_lft = TEMP_VALID_LIFETIME,
197 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
198 .regen_max_retry = REGEN_MAX_RETRY,
199 .max_desync_factor = MAX_DESYNC_FACTOR,
200 .max_addresses = IPV6_MAX_ADDRESSES,
201 .accept_ra_defrtr = 1,
202 .ra_defrtr_metric = IP6_RT_PRIO_USER,
203 .accept_ra_from_local = 0,
204 .accept_ra_min_hop_limit= 1,
205 .accept_ra_pinfo = 1,
206#ifdef CONFIG_IPV6_ROUTER_PREF
207 .accept_ra_rtr_pref = 1,
208 .rtr_probe_interval = 60 * HZ,
209#ifdef CONFIG_IPV6_ROUTE_INFO
210 .accept_ra_rt_info_min_plen = 0,
211 .accept_ra_rt_info_max_plen = 0,
212#endif
213#endif
214 .proxy_ndp = 0,
215 .accept_source_route = 0, /* we do not accept RH0 by default. */
216 .disable_ipv6 = 0,
217 .accept_dad = 0,
218 .suppress_frag_ndisc = 1,
219 .accept_ra_mtu = 1,
220 .stable_secret = {
221 .initialized = false,
222 },
223 .use_oif_addrs_only = 0,
224 .ignore_routes_with_linkdown = 0,
225 .keep_addr_on_down = 0,
226 .seg6_enabled = 0,
227#ifdef CONFIG_IPV6_SEG6_HMAC
228 .seg6_require_hmac = 0,
229#endif
230 .enhanced_dad = 1,
231 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
232 .disable_policy = 0,
233 .rpl_seg_enabled = 0,
234 .ioam6_enabled = 0,
235 .ioam6_id = IOAM6_DEFAULT_IF_ID,
236 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
237 .ndisc_evict_nocarrier = 1,
238};
239
240static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
241 .forwarding = 0,
242 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
243 .mtu6 = IPV6_MIN_MTU,
244 .accept_ra = 1,
245 .accept_redirects = 1,
246 .autoconf = 1,
247 .force_mld_version = 0,
248 .mldv1_unsolicited_report_interval = 10 * HZ,
249 .mldv2_unsolicited_report_interval = HZ,
250 .dad_transmits = 1,
251 .rtr_solicits = MAX_RTR_SOLICITATIONS,
252 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
253 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
254 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
255 .use_tempaddr = 0,
256 .temp_valid_lft = TEMP_VALID_LIFETIME,
257 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
258 .regen_max_retry = REGEN_MAX_RETRY,
259 .max_desync_factor = MAX_DESYNC_FACTOR,
260 .max_addresses = IPV6_MAX_ADDRESSES,
261 .accept_ra_defrtr = 1,
262 .ra_defrtr_metric = IP6_RT_PRIO_USER,
263 .accept_ra_from_local = 0,
264 .accept_ra_min_hop_limit= 1,
265 .accept_ra_pinfo = 1,
266#ifdef CONFIG_IPV6_ROUTER_PREF
267 .accept_ra_rtr_pref = 1,
268 .rtr_probe_interval = 60 * HZ,
269#ifdef CONFIG_IPV6_ROUTE_INFO
270 .accept_ra_rt_info_min_plen = 0,
271 .accept_ra_rt_info_max_plen = 0,
272#endif
273#endif
274 .proxy_ndp = 0,
275 .accept_source_route = 0, /* we do not accept RH0 by default. */
276 .disable_ipv6 = 0,
277 .accept_dad = 1,
278 .suppress_frag_ndisc = 1,
279 .accept_ra_mtu = 1,
280 .stable_secret = {
281 .initialized = false,
282 },
283 .use_oif_addrs_only = 0,
284 .ignore_routes_with_linkdown = 0,
285 .keep_addr_on_down = 0,
286 .seg6_enabled = 0,
287#ifdef CONFIG_IPV6_SEG6_HMAC
288 .seg6_require_hmac = 0,
289#endif
290 .enhanced_dad = 1,
291 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
292 .disable_policy = 0,
293 .rpl_seg_enabled = 0,
294 .ioam6_enabled = 0,
295 .ioam6_id = IOAM6_DEFAULT_IF_ID,
296 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
297 .ndisc_evict_nocarrier = 1,
298};
299
300/* Check if link is ready: is it up and is a valid qdisc available */
301static inline bool addrconf_link_ready(const struct net_device *dev)
302{
303 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
304}
305
306static void addrconf_del_rs_timer(struct inet6_dev *idev)
307{
308 if (del_timer(&idev->rs_timer))
309 __in6_dev_put(idev);
310}
311
312static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
313{
314 if (cancel_delayed_work(&ifp->dad_work))
315 __in6_ifa_put(ifp);
316}
317
318static void addrconf_mod_rs_timer(struct inet6_dev *idev,
319 unsigned long when)
320{
321 if (!timer_pending(&idev->rs_timer))
322 in6_dev_hold(idev);
323 mod_timer(&idev->rs_timer, jiffies + when);
324}
325
326static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
327 unsigned long delay)
328{
329 in6_ifa_hold(ifp);
330 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
331 in6_ifa_put(ifp);
332}
333
334static int snmp6_alloc_dev(struct inet6_dev *idev)
335{
336 int i;
337
338 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT);
339 if (!idev->stats.ipv6)
340 goto err_ip;
341
342 for_each_possible_cpu(i) {
343 struct ipstats_mib *addrconf_stats;
344 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
345 u64_stats_init(&addrconf_stats->syncp);
346 }
347
348
349 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
350 GFP_KERNEL);
351 if (!idev->stats.icmpv6dev)
352 goto err_icmp;
353 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
354 GFP_KERNEL_ACCOUNT);
355 if (!idev->stats.icmpv6msgdev)
356 goto err_icmpmsg;
357
358 return 0;
359
360err_icmpmsg:
361 kfree(idev->stats.icmpv6dev);
362err_icmp:
363 free_percpu(idev->stats.ipv6);
364err_ip:
365 return -ENOMEM;
366}
367
368static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
369{
370 struct inet6_dev *ndev;
371 int err = -ENOMEM;
372
373 ASSERT_RTNL();
374
375 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev)
376 return ERR_PTR(-EINVAL);
377
378 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT);
379 if (!ndev)
380 return ERR_PTR(err);
381
382 rwlock_init(&ndev->lock);
383 ndev->dev = dev;
384 INIT_LIST_HEAD(&ndev->addr_list);
385 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
386 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
387
388 if (ndev->cnf.stable_secret.initialized)
389 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
390
391 ndev->cnf.mtu6 = dev->mtu;
392 ndev->ra_mtu = 0;
393 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
394 if (!ndev->nd_parms) {
395 kfree(ndev);
396 return ERR_PTR(err);
397 }
398 if (ndev->cnf.forwarding)
399 dev_disable_lro(dev);
400 /* We refer to the device */
401 netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL);
402
403 if (snmp6_alloc_dev(ndev) < 0) {
404 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
405 __func__);
406 neigh_parms_release(&nd_tbl, ndev->nd_parms);
407 netdev_put(dev, &ndev->dev_tracker);
408 kfree(ndev);
409 return ERR_PTR(err);
410 }
411
412 if (dev != blackhole_netdev) {
413 if (snmp6_register_dev(ndev) < 0) {
414 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
415 __func__, dev->name);
416 goto err_release;
417 }
418 }
419 /* One reference from device. */
420 refcount_set(&ndev->refcnt, 1);
421
422 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
423 ndev->cnf.accept_dad = -1;
424
425#if IS_ENABLED(CONFIG_IPV6_SIT)
426 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
427 pr_info("%s: Disabled Multicast RS\n", dev->name);
428 ndev->cnf.rtr_solicits = 0;
429 }
430#endif
431
432 INIT_LIST_HEAD(&ndev->tempaddr_list);
433 ndev->desync_factor = U32_MAX;
434 if ((dev->flags&IFF_LOOPBACK) ||
435 dev->type == ARPHRD_TUNNEL ||
436 dev->type == ARPHRD_TUNNEL6 ||
437 dev->type == ARPHRD_SIT ||
438 dev->type == ARPHRD_NONE) {
439 ndev->cnf.use_tempaddr = -1;
440 }
441
442 ndev->token = in6addr_any;
443
444 if (netif_running(dev) && addrconf_link_ready(dev))
445 ndev->if_flags |= IF_READY;
446
447 ipv6_mc_init_dev(ndev);
448 ndev->tstamp = jiffies;
449 if (dev != blackhole_netdev) {
450 err = addrconf_sysctl_register(ndev);
451 if (err) {
452 ipv6_mc_destroy_dev(ndev);
453 snmp6_unregister_dev(ndev);
454 goto err_release;
455 }
456 }
457 /* protected by rtnl_lock */
458 rcu_assign_pointer(dev->ip6_ptr, ndev);
459
460 if (dev != blackhole_netdev) {
461 /* Join interface-local all-node multicast group */
462 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
463
464 /* Join all-node multicast group */
465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
466
467 /* Join all-router multicast group if forwarding is set */
468 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
469 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
470 }
471 return ndev;
472
473err_release:
474 neigh_parms_release(&nd_tbl, ndev->nd_parms);
475 ndev->dead = 1;
476 in6_dev_finish_destroy(ndev);
477 return ERR_PTR(err);
478}
479
480static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
481{
482 struct inet6_dev *idev;
483
484 ASSERT_RTNL();
485
486 idev = __in6_dev_get(dev);
487 if (!idev) {
488 idev = ipv6_add_dev(dev);
489 if (IS_ERR(idev))
490 return idev;
491 }
492
493 if (dev->flags&IFF_UP)
494 ipv6_mc_up(idev);
495 return idev;
496}
497
498static int inet6_netconf_msgsize_devconf(int type)
499{
500 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
501 + nla_total_size(4); /* NETCONFA_IFINDEX */
502 bool all = false;
503
504 if (type == NETCONFA_ALL)
505 all = true;
506
507 if (all || type == NETCONFA_FORWARDING)
508 size += nla_total_size(4);
509#ifdef CONFIG_IPV6_MROUTE
510 if (all || type == NETCONFA_MC_FORWARDING)
511 size += nla_total_size(4);
512#endif
513 if (all || type == NETCONFA_PROXY_NEIGH)
514 size += nla_total_size(4);
515
516 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
517 size += nla_total_size(4);
518
519 return size;
520}
521
522static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
523 struct ipv6_devconf *devconf, u32 portid,
524 u32 seq, int event, unsigned int flags,
525 int type)
526{
527 struct nlmsghdr *nlh;
528 struct netconfmsg *ncm;
529 bool all = false;
530
531 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
532 flags);
533 if (!nlh)
534 return -EMSGSIZE;
535
536 if (type == NETCONFA_ALL)
537 all = true;
538
539 ncm = nlmsg_data(nlh);
540 ncm->ncm_family = AF_INET6;
541
542 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
543 goto nla_put_failure;
544
545 if (!devconf)
546 goto out;
547
548 if ((all || type == NETCONFA_FORWARDING) &&
549 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
550 goto nla_put_failure;
551#ifdef CONFIG_IPV6_MROUTE
552 if ((all || type == NETCONFA_MC_FORWARDING) &&
553 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
554 atomic_read(&devconf->mc_forwarding)) < 0)
555 goto nla_put_failure;
556#endif
557 if ((all || type == NETCONFA_PROXY_NEIGH) &&
558 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
559 goto nla_put_failure;
560
561 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
562 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
563 devconf->ignore_routes_with_linkdown) < 0)
564 goto nla_put_failure;
565
566out:
567 nlmsg_end(skb, nlh);
568 return 0;
569
570nla_put_failure:
571 nlmsg_cancel(skb, nlh);
572 return -EMSGSIZE;
573}
574
575void inet6_netconf_notify_devconf(struct net *net, int event, int type,
576 int ifindex, struct ipv6_devconf *devconf)
577{
578 struct sk_buff *skb;
579 int err = -ENOBUFS;
580
581 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
582 if (!skb)
583 goto errout;
584
585 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
586 event, 0, type);
587 if (err < 0) {
588 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
589 WARN_ON(err == -EMSGSIZE);
590 kfree_skb(skb);
591 goto errout;
592 }
593 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
594 return;
595errout:
596 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
597}
598
599static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
600 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
601 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
602 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
603 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
604};
605
606static int inet6_netconf_valid_get_req(struct sk_buff *skb,
607 const struct nlmsghdr *nlh,
608 struct nlattr **tb,
609 struct netlink_ext_ack *extack)
610{
611 int i, err;
612
613 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
614 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
615 return -EINVAL;
616 }
617
618 if (!netlink_strict_get_check(skb))
619 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
620 tb, NETCONFA_MAX,
621 devconf_ipv6_policy, extack);
622
623 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
624 tb, NETCONFA_MAX,
625 devconf_ipv6_policy, extack);
626 if (err)
627 return err;
628
629 for (i = 0; i <= NETCONFA_MAX; i++) {
630 if (!tb[i])
631 continue;
632
633 switch (i) {
634 case NETCONFA_IFINDEX:
635 break;
636 default:
637 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
638 return -EINVAL;
639 }
640 }
641
642 return 0;
643}
644
645static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
646 struct nlmsghdr *nlh,
647 struct netlink_ext_ack *extack)
648{
649 struct net *net = sock_net(in_skb->sk);
650 struct nlattr *tb[NETCONFA_MAX+1];
651 struct inet6_dev *in6_dev = NULL;
652 struct net_device *dev = NULL;
653 struct sk_buff *skb;
654 struct ipv6_devconf *devconf;
655 int ifindex;
656 int err;
657
658 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
659 if (err < 0)
660 return err;
661
662 if (!tb[NETCONFA_IFINDEX])
663 return -EINVAL;
664
665 err = -EINVAL;
666 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
667 switch (ifindex) {
668 case NETCONFA_IFINDEX_ALL:
669 devconf = net->ipv6.devconf_all;
670 break;
671 case NETCONFA_IFINDEX_DEFAULT:
672 devconf = net->ipv6.devconf_dflt;
673 break;
674 default:
675 dev = dev_get_by_index(net, ifindex);
676 if (!dev)
677 return -EINVAL;
678 in6_dev = in6_dev_get(dev);
679 if (!in6_dev)
680 goto errout;
681 devconf = &in6_dev->cnf;
682 break;
683 }
684
685 err = -ENOBUFS;
686 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
687 if (!skb)
688 goto errout;
689
690 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
691 NETLINK_CB(in_skb).portid,
692 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
693 NETCONFA_ALL);
694 if (err < 0) {
695 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
696 WARN_ON(err == -EMSGSIZE);
697 kfree_skb(skb);
698 goto errout;
699 }
700 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
701errout:
702 if (in6_dev)
703 in6_dev_put(in6_dev);
704 dev_put(dev);
705 return err;
706}
707
708static int inet6_netconf_dump_devconf(struct sk_buff *skb,
709 struct netlink_callback *cb)
710{
711 const struct nlmsghdr *nlh = cb->nlh;
712 struct net *net = sock_net(skb->sk);
713 int h, s_h;
714 int idx, s_idx;
715 struct net_device *dev;
716 struct inet6_dev *idev;
717 struct hlist_head *head;
718
719 if (cb->strict_check) {
720 struct netlink_ext_ack *extack = cb->extack;
721 struct netconfmsg *ncm;
722
723 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
724 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
725 return -EINVAL;
726 }
727
728 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
729 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
730 return -EINVAL;
731 }
732 }
733
734 s_h = cb->args[0];
735 s_idx = idx = cb->args[1];
736
737 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
738 idx = 0;
739 head = &net->dev_index_head[h];
740 rcu_read_lock();
741 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
742 net->dev_base_seq;
743 hlist_for_each_entry_rcu(dev, head, index_hlist) {
744 if (idx < s_idx)
745 goto cont;
746 idev = __in6_dev_get(dev);
747 if (!idev)
748 goto cont;
749
750 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
751 &idev->cnf,
752 NETLINK_CB(cb->skb).portid,
753 nlh->nlmsg_seq,
754 RTM_NEWNETCONF,
755 NLM_F_MULTI,
756 NETCONFA_ALL) < 0) {
757 rcu_read_unlock();
758 goto done;
759 }
760 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
761cont:
762 idx++;
763 }
764 rcu_read_unlock();
765 }
766 if (h == NETDEV_HASHENTRIES) {
767 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
768 net->ipv6.devconf_all,
769 NETLINK_CB(cb->skb).portid,
770 nlh->nlmsg_seq,
771 RTM_NEWNETCONF, NLM_F_MULTI,
772 NETCONFA_ALL) < 0)
773 goto done;
774 else
775 h++;
776 }
777 if (h == NETDEV_HASHENTRIES + 1) {
778 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
779 net->ipv6.devconf_dflt,
780 NETLINK_CB(cb->skb).portid,
781 nlh->nlmsg_seq,
782 RTM_NEWNETCONF, NLM_F_MULTI,
783 NETCONFA_ALL) < 0)
784 goto done;
785 else
786 h++;
787 }
788done:
789 cb->args[0] = h;
790 cb->args[1] = idx;
791
792 return skb->len;
793}
794
795#ifdef CONFIG_SYSCTL
796static void dev_forward_change(struct inet6_dev *idev)
797{
798 struct net_device *dev;
799 struct inet6_ifaddr *ifa;
800 LIST_HEAD(tmp_addr_list);
801
802 if (!idev)
803 return;
804 dev = idev->dev;
805 if (idev->cnf.forwarding)
806 dev_disable_lro(dev);
807 if (dev->flags & IFF_MULTICAST) {
808 if (idev->cnf.forwarding) {
809 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
810 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
811 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
812 } else {
813 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
814 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
815 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
816 }
817 }
818
819 read_lock_bh(&idev->lock);
820 list_for_each_entry(ifa, &idev->addr_list, if_list) {
821 if (ifa->flags&IFA_F_TENTATIVE)
822 continue;
823 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
824 }
825 read_unlock_bh(&idev->lock);
826
827 while (!list_empty(&tmp_addr_list)) {
828 ifa = list_first_entry(&tmp_addr_list,
829 struct inet6_ifaddr, if_list_aux);
830 list_del(&ifa->if_list_aux);
831 if (idev->cnf.forwarding)
832 addrconf_join_anycast(ifa);
833 else
834 addrconf_leave_anycast(ifa);
835 }
836
837 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
838 NETCONFA_FORWARDING,
839 dev->ifindex, &idev->cnf);
840}
841
842
843static void addrconf_forward_change(struct net *net, __s32 newf)
844{
845 struct net_device *dev;
846 struct inet6_dev *idev;
847
848 for_each_netdev(net, dev) {
849 idev = __in6_dev_get(dev);
850 if (idev) {
851 int changed = (!idev->cnf.forwarding) ^ (!newf);
852 idev->cnf.forwarding = newf;
853 if (changed)
854 dev_forward_change(idev);
855 }
856 }
857}
858
859static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
860{
861 struct net *net;
862 int old;
863
864 if (!rtnl_trylock())
865 return restart_syscall();
866
867 net = (struct net *)table->extra2;
868 old = *p;
869 *p = newf;
870
871 if (p == &net->ipv6.devconf_dflt->forwarding) {
872 if ((!newf) ^ (!old))
873 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
874 NETCONFA_FORWARDING,
875 NETCONFA_IFINDEX_DEFAULT,
876 net->ipv6.devconf_dflt);
877 rtnl_unlock();
878 return 0;
879 }
880
881 if (p == &net->ipv6.devconf_all->forwarding) {
882 int old_dflt = net->ipv6.devconf_dflt->forwarding;
883
884 net->ipv6.devconf_dflt->forwarding = newf;
885 if ((!newf) ^ (!old_dflt))
886 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
887 NETCONFA_FORWARDING,
888 NETCONFA_IFINDEX_DEFAULT,
889 net->ipv6.devconf_dflt);
890
891 addrconf_forward_change(net, newf);
892 if ((!newf) ^ (!old))
893 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
894 NETCONFA_FORWARDING,
895 NETCONFA_IFINDEX_ALL,
896 net->ipv6.devconf_all);
897 } else if ((!newf) ^ (!old))
898 dev_forward_change((struct inet6_dev *)table->extra1);
899 rtnl_unlock();
900
901 if (newf)
902 rt6_purge_dflt_routers(net);
903 return 1;
904}
905
906static void addrconf_linkdown_change(struct net *net, __s32 newf)
907{
908 struct net_device *dev;
909 struct inet6_dev *idev;
910
911 for_each_netdev(net, dev) {
912 idev = __in6_dev_get(dev);
913 if (idev) {
914 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
915
916 idev->cnf.ignore_routes_with_linkdown = newf;
917 if (changed)
918 inet6_netconf_notify_devconf(dev_net(dev),
919 RTM_NEWNETCONF,
920 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
921 dev->ifindex,
922 &idev->cnf);
923 }
924 }
925}
926
927static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
928{
929 struct net *net;
930 int old;
931
932 if (!rtnl_trylock())
933 return restart_syscall();
934
935 net = (struct net *)table->extra2;
936 old = *p;
937 *p = newf;
938
939 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
940 if ((!newf) ^ (!old))
941 inet6_netconf_notify_devconf(net,
942 RTM_NEWNETCONF,
943 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
944 NETCONFA_IFINDEX_DEFAULT,
945 net->ipv6.devconf_dflt);
946 rtnl_unlock();
947 return 0;
948 }
949
950 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
951 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
952 addrconf_linkdown_change(net, newf);
953 if ((!newf) ^ (!old))
954 inet6_netconf_notify_devconf(net,
955 RTM_NEWNETCONF,
956 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
957 NETCONFA_IFINDEX_ALL,
958 net->ipv6.devconf_all);
959 }
960 rtnl_unlock();
961
962 return 1;
963}
964
965#endif
966
967/* Nobody refers to this ifaddr, destroy it */
968void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
969{
970 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
971
972#ifdef NET_REFCNT_DEBUG
973 pr_debug("%s\n", __func__);
974#endif
975
976 in6_dev_put(ifp->idev);
977
978 if (cancel_delayed_work(&ifp->dad_work))
979 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
980 ifp);
981
982 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
983 pr_warn("Freeing alive inet6 address %p\n", ifp);
984 return;
985 }
986
987 kfree_rcu(ifp, rcu);
988}
989
990static void
991ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
992{
993 struct list_head *p;
994 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
995
996 /*
997 * Each device address list is sorted in order of scope -
998 * global before linklocal.
999 */
1000 list_for_each(p, &idev->addr_list) {
1001 struct inet6_ifaddr *ifa
1002 = list_entry(p, struct inet6_ifaddr, if_list);
1003 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
1004 break;
1005 }
1006
1007 list_add_tail_rcu(&ifp->if_list, p);
1008}
1009
1010static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
1011{
1012 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
1013
1014 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1015}
1016
1017static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1018 struct net_device *dev, unsigned int hash)
1019{
1020 struct inet6_ifaddr *ifp;
1021
1022 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1023 if (ipv6_addr_equal(&ifp->addr, addr)) {
1024 if (!dev || ifp->idev->dev == dev)
1025 return true;
1026 }
1027 }
1028 return false;
1029}
1030
1031static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1032{
1033 struct net *net = dev_net(dev);
1034 unsigned int hash = inet6_addr_hash(net, &ifa->addr);
1035 int err = 0;
1036
1037 spin_lock(&net->ipv6.addrconf_hash_lock);
1038
1039 /* Ignore adding duplicate addresses on an interface */
1040 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) {
1041 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1042 err = -EEXIST;
1043 } else {
1044 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]);
1045 }
1046
1047 spin_unlock(&net->ipv6.addrconf_hash_lock);
1048
1049 return err;
1050}
1051
1052/* On success it returns ifp with increased reference count */
1053
1054static struct inet6_ifaddr *
1055ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1056 bool can_block, struct netlink_ext_ack *extack)
1057{
1058 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1059 int addr_type = ipv6_addr_type(cfg->pfx);
1060 struct net *net = dev_net(idev->dev);
1061 struct inet6_ifaddr *ifa = NULL;
1062 struct fib6_info *f6i = NULL;
1063 int err = 0;
1064
1065 if (addr_type == IPV6_ADDR_ANY ||
1066 (addr_type & IPV6_ADDR_MULTICAST &&
1067 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1068 (!(idev->dev->flags & IFF_LOOPBACK) &&
1069 !netif_is_l3_master(idev->dev) &&
1070 addr_type & IPV6_ADDR_LOOPBACK))
1071 return ERR_PTR(-EADDRNOTAVAIL);
1072
1073 if (idev->dead) {
1074 err = -ENODEV; /*XXX*/
1075 goto out;
1076 }
1077
1078 if (idev->cnf.disable_ipv6) {
1079 err = -EACCES;
1080 goto out;
1081 }
1082
1083 /* validator notifier needs to be blocking;
1084 * do not call in atomic context
1085 */
1086 if (can_block) {
1087 struct in6_validator_info i6vi = {
1088 .i6vi_addr = *cfg->pfx,
1089 .i6vi_dev = idev,
1090 .extack = extack,
1091 };
1092
1093 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1094 err = notifier_to_errno(err);
1095 if (err < 0)
1096 goto out;
1097 }
1098
1099 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT);
1100 if (!ifa) {
1101 err = -ENOBUFS;
1102 goto out;
1103 }
1104
1105 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1106 if (IS_ERR(f6i)) {
1107 err = PTR_ERR(f6i);
1108 f6i = NULL;
1109 goto out;
1110 }
1111
1112 neigh_parms_data_state_setall(idev->nd_parms);
1113
1114 ifa->addr = *cfg->pfx;
1115 if (cfg->peer_pfx)
1116 ifa->peer_addr = *cfg->peer_pfx;
1117
1118 spin_lock_init(&ifa->lock);
1119 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1120 INIT_HLIST_NODE(&ifa->addr_lst);
1121 ifa->scope = cfg->scope;
1122 ifa->prefix_len = cfg->plen;
1123 ifa->rt_priority = cfg->rt_priority;
1124 ifa->flags = cfg->ifa_flags;
1125 ifa->ifa_proto = cfg->ifa_proto;
1126 /* No need to add the TENTATIVE flag for addresses with NODAD */
1127 if (!(cfg->ifa_flags & IFA_F_NODAD))
1128 ifa->flags |= IFA_F_TENTATIVE;
1129 ifa->valid_lft = cfg->valid_lft;
1130 ifa->prefered_lft = cfg->preferred_lft;
1131 ifa->cstamp = ifa->tstamp = jiffies;
1132 ifa->tokenized = false;
1133
1134 ifa->rt = f6i;
1135
1136 ifa->idev = idev;
1137 in6_dev_hold(idev);
1138
1139 /* For caller */
1140 refcount_set(&ifa->refcnt, 1);
1141
1142 rcu_read_lock_bh();
1143
1144 err = ipv6_add_addr_hash(idev->dev, ifa);
1145 if (err < 0) {
1146 rcu_read_unlock_bh();
1147 goto out;
1148 }
1149
1150 write_lock(&idev->lock);
1151
1152 /* Add to inet6_dev unicast addr list. */
1153 ipv6_link_dev_addr(idev, ifa);
1154
1155 if (ifa->flags&IFA_F_TEMPORARY) {
1156 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1157 in6_ifa_hold(ifa);
1158 }
1159
1160 in6_ifa_hold(ifa);
1161 write_unlock(&idev->lock);
1162
1163 rcu_read_unlock_bh();
1164
1165 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1166out:
1167 if (unlikely(err < 0)) {
1168 fib6_info_release(f6i);
1169
1170 if (ifa) {
1171 if (ifa->idev)
1172 in6_dev_put(ifa->idev);
1173 kfree(ifa);
1174 }
1175 ifa = ERR_PTR(err);
1176 }
1177
1178 return ifa;
1179}
1180
1181enum cleanup_prefix_rt_t {
1182 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1183 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1184 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1185};
1186
1187/*
1188 * Check, whether the prefix for ifp would still need a prefix route
1189 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1190 * constants.
1191 *
1192 * 1) we don't purge prefix if address was not permanent.
1193 * prefix is managed by its own lifetime.
1194 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1195 * 3) if there are no addresses, delete prefix.
1196 * 4) if there are still other permanent address(es),
1197 * corresponding prefix is still permanent.
1198 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1199 * don't purge the prefix, assume user space is managing it.
1200 * 6) otherwise, update prefix lifetime to the
1201 * longest valid lifetime among the corresponding
1202 * addresses on the device.
1203 * Note: subsequent RA will update lifetime.
1204 **/
1205static enum cleanup_prefix_rt_t
1206check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1207{
1208 struct inet6_ifaddr *ifa;
1209 struct inet6_dev *idev = ifp->idev;
1210 unsigned long lifetime;
1211 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1212
1213 *expires = jiffies;
1214
1215 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1216 if (ifa == ifp)
1217 continue;
1218 if (ifa->prefix_len != ifp->prefix_len ||
1219 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1220 ifp->prefix_len))
1221 continue;
1222 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1223 return CLEANUP_PREFIX_RT_NOP;
1224
1225 action = CLEANUP_PREFIX_RT_EXPIRE;
1226
1227 spin_lock(&ifa->lock);
1228
1229 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1230 /*
1231 * Note: Because this address is
1232 * not permanent, lifetime <
1233 * LONG_MAX / HZ here.
1234 */
1235 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1236 *expires = ifa->tstamp + lifetime * HZ;
1237 spin_unlock(&ifa->lock);
1238 }
1239
1240 return action;
1241}
1242
1243static void
1244cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1245 bool del_rt, bool del_peer)
1246{
1247 struct fib6_info *f6i;
1248
1249 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1250 ifp->prefix_len,
1251 ifp->idev->dev, 0, RTF_DEFAULT, true);
1252 if (f6i) {
1253 if (del_rt)
1254 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1255 else {
1256 if (!(f6i->fib6_flags & RTF_EXPIRES))
1257 fib6_set_expires(f6i, expires);
1258 fib6_info_release(f6i);
1259 }
1260 }
1261}
1262
1263
1264/* This function wants to get referenced ifp and releases it before return */
1265
1266static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1267{
1268 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1269 struct net *net = dev_net(ifp->idev->dev);
1270 unsigned long expires;
1271 int state;
1272
1273 ASSERT_RTNL();
1274
1275 spin_lock_bh(&ifp->lock);
1276 state = ifp->state;
1277 ifp->state = INET6_IFADDR_STATE_DEAD;
1278 spin_unlock_bh(&ifp->lock);
1279
1280 if (state == INET6_IFADDR_STATE_DEAD)
1281 goto out;
1282
1283 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1284 hlist_del_init_rcu(&ifp->addr_lst);
1285 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1286
1287 write_lock_bh(&ifp->idev->lock);
1288
1289 if (ifp->flags&IFA_F_TEMPORARY) {
1290 list_del(&ifp->tmp_list);
1291 if (ifp->ifpub) {
1292 in6_ifa_put(ifp->ifpub);
1293 ifp->ifpub = NULL;
1294 }
1295 __in6_ifa_put(ifp);
1296 }
1297
1298 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1299 action = check_cleanup_prefix_route(ifp, &expires);
1300
1301 list_del_rcu(&ifp->if_list);
1302 __in6_ifa_put(ifp);
1303
1304 write_unlock_bh(&ifp->idev->lock);
1305
1306 addrconf_del_dad_work(ifp);
1307
1308 ipv6_ifa_notify(RTM_DELADDR, ifp);
1309
1310 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1311
1312 if (action != CLEANUP_PREFIX_RT_NOP) {
1313 cleanup_prefix_route(ifp, expires,
1314 action == CLEANUP_PREFIX_RT_DEL, false);
1315 }
1316
1317 /* clean up prefsrc entries */
1318 rt6_remove_prefsrc(ifp);
1319out:
1320 in6_ifa_put(ifp);
1321}
1322
1323static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1324{
1325 struct inet6_dev *idev = ifp->idev;
1326 unsigned long tmp_tstamp, age;
1327 unsigned long regen_advance;
1328 unsigned long now = jiffies;
1329 s32 cnf_temp_preferred_lft;
1330 struct inet6_ifaddr *ift;
1331 struct ifa6_config cfg;
1332 long max_desync_factor;
1333 struct in6_addr addr;
1334 int ret = 0;
1335
1336 write_lock_bh(&idev->lock);
1337
1338retry:
1339 in6_dev_hold(idev);
1340 if (idev->cnf.use_tempaddr <= 0) {
1341 write_unlock_bh(&idev->lock);
1342 pr_info("%s: use_tempaddr is disabled\n", __func__);
1343 in6_dev_put(idev);
1344 ret = -1;
1345 goto out;
1346 }
1347 spin_lock_bh(&ifp->lock);
1348 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1349 idev->cnf.use_tempaddr = -1; /*XXX*/
1350 spin_unlock_bh(&ifp->lock);
1351 write_unlock_bh(&idev->lock);
1352 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1353 __func__);
1354 in6_dev_put(idev);
1355 ret = -1;
1356 goto out;
1357 }
1358 in6_ifa_hold(ifp);
1359 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1360 ipv6_gen_rnd_iid(&addr);
1361
1362 age = (now - ifp->tstamp) / HZ;
1363
1364 regen_advance = idev->cnf.regen_max_retry *
1365 idev->cnf.dad_transmits *
1366 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1367
1368 /* recalculate max_desync_factor each time and update
1369 * idev->desync_factor if it's larger
1370 */
1371 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1372 max_desync_factor = min_t(__u32,
1373 idev->cnf.max_desync_factor,
1374 cnf_temp_preferred_lft - regen_advance);
1375
1376 if (unlikely(idev->desync_factor > max_desync_factor)) {
1377 if (max_desync_factor > 0) {
1378 get_random_bytes(&idev->desync_factor,
1379 sizeof(idev->desync_factor));
1380 idev->desync_factor %= max_desync_factor;
1381 } else {
1382 idev->desync_factor = 0;
1383 }
1384 }
1385
1386 memset(&cfg, 0, sizeof(cfg));
1387 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1388 idev->cnf.temp_valid_lft + age);
1389 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1390 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1391
1392 cfg.plen = ifp->prefix_len;
1393 tmp_tstamp = ifp->tstamp;
1394 spin_unlock_bh(&ifp->lock);
1395
1396 write_unlock_bh(&idev->lock);
1397
1398 /* A temporary address is created only if this calculated Preferred
1399 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1400 * an implementation must not create a temporary address with a zero
1401 * Preferred Lifetime.
1402 * Use age calculation as in addrconf_verify to avoid unnecessary
1403 * temporary addresses being generated.
1404 */
1405 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1406 if (cfg.preferred_lft <= regen_advance + age) {
1407 in6_ifa_put(ifp);
1408 in6_dev_put(idev);
1409 ret = -1;
1410 goto out;
1411 }
1412
1413 cfg.ifa_flags = IFA_F_TEMPORARY;
1414 /* set in addrconf_prefix_rcv() */
1415 if (ifp->flags & IFA_F_OPTIMISTIC)
1416 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1417
1418 cfg.pfx = &addr;
1419 cfg.scope = ipv6_addr_scope(cfg.pfx);
1420
1421 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1422 if (IS_ERR(ift)) {
1423 in6_ifa_put(ifp);
1424 in6_dev_put(idev);
1425 pr_info("%s: retry temporary address regeneration\n", __func__);
1426 write_lock_bh(&idev->lock);
1427 goto retry;
1428 }
1429
1430 spin_lock_bh(&ift->lock);
1431 ift->ifpub = ifp;
1432 ift->cstamp = now;
1433 ift->tstamp = tmp_tstamp;
1434 spin_unlock_bh(&ift->lock);
1435
1436 addrconf_dad_start(ift);
1437 in6_ifa_put(ift);
1438 in6_dev_put(idev);
1439out:
1440 return ret;
1441}
1442
1443/*
1444 * Choose an appropriate source address (RFC3484)
1445 */
1446enum {
1447 IPV6_SADDR_RULE_INIT = 0,
1448 IPV6_SADDR_RULE_LOCAL,
1449 IPV6_SADDR_RULE_SCOPE,
1450 IPV6_SADDR_RULE_PREFERRED,
1451#ifdef CONFIG_IPV6_MIP6
1452 IPV6_SADDR_RULE_HOA,
1453#endif
1454 IPV6_SADDR_RULE_OIF,
1455 IPV6_SADDR_RULE_LABEL,
1456 IPV6_SADDR_RULE_PRIVACY,
1457 IPV6_SADDR_RULE_ORCHID,
1458 IPV6_SADDR_RULE_PREFIX,
1459#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1460 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1461#endif
1462 IPV6_SADDR_RULE_MAX
1463};
1464
1465struct ipv6_saddr_score {
1466 int rule;
1467 int addr_type;
1468 struct inet6_ifaddr *ifa;
1469 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1470 int scopedist;
1471 int matchlen;
1472};
1473
1474struct ipv6_saddr_dst {
1475 const struct in6_addr *addr;
1476 int ifindex;
1477 int scope;
1478 int label;
1479 unsigned int prefs;
1480};
1481
1482static inline int ipv6_saddr_preferred(int type)
1483{
1484 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1485 return 1;
1486 return 0;
1487}
1488
1489static bool ipv6_use_optimistic_addr(struct net *net,
1490 struct inet6_dev *idev)
1491{
1492#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1493 if (!idev)
1494 return false;
1495 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1496 return false;
1497 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1498 return false;
1499
1500 return true;
1501#else
1502 return false;
1503#endif
1504}
1505
1506static bool ipv6_allow_optimistic_dad(struct net *net,
1507 struct inet6_dev *idev)
1508{
1509#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1510 if (!idev)
1511 return false;
1512 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1513 return false;
1514
1515 return true;
1516#else
1517 return false;
1518#endif
1519}
1520
1521static int ipv6_get_saddr_eval(struct net *net,
1522 struct ipv6_saddr_score *score,
1523 struct ipv6_saddr_dst *dst,
1524 int i)
1525{
1526 int ret;
1527
1528 if (i <= score->rule) {
1529 switch (i) {
1530 case IPV6_SADDR_RULE_SCOPE:
1531 ret = score->scopedist;
1532 break;
1533 case IPV6_SADDR_RULE_PREFIX:
1534 ret = score->matchlen;
1535 break;
1536 default:
1537 ret = !!test_bit(i, score->scorebits);
1538 }
1539 goto out;
1540 }
1541
1542 switch (i) {
1543 case IPV6_SADDR_RULE_INIT:
1544 /* Rule 0: remember if hiscore is not ready yet */
1545 ret = !!score->ifa;
1546 break;
1547 case IPV6_SADDR_RULE_LOCAL:
1548 /* Rule 1: Prefer same address */
1549 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1550 break;
1551 case IPV6_SADDR_RULE_SCOPE:
1552 /* Rule 2: Prefer appropriate scope
1553 *
1554 * ret
1555 * ^
1556 * -1 | d 15
1557 * ---+--+-+---> scope
1558 * |
1559 * | d is scope of the destination.
1560 * B-d | \
1561 * | \ <- smaller scope is better if
1562 * B-15 | \ if scope is enough for destination.
1563 * | ret = B - scope (-1 <= scope >= d <= 15).
1564 * d-C-1 | /
1565 * |/ <- greater is better
1566 * -C / if scope is not enough for destination.
1567 * /| ret = scope - C (-1 <= d < scope <= 15).
1568 *
1569 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1570 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1571 * Assume B = 0 and we get C > 29.
1572 */
1573 ret = __ipv6_addr_src_scope(score->addr_type);
1574 if (ret >= dst->scope)
1575 ret = -ret;
1576 else
1577 ret -= 128; /* 30 is enough */
1578 score->scopedist = ret;
1579 break;
1580 case IPV6_SADDR_RULE_PREFERRED:
1581 {
1582 /* Rule 3: Avoid deprecated and optimistic addresses */
1583 u8 avoid = IFA_F_DEPRECATED;
1584
1585 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1586 avoid |= IFA_F_OPTIMISTIC;
1587 ret = ipv6_saddr_preferred(score->addr_type) ||
1588 !(score->ifa->flags & avoid);
1589 break;
1590 }
1591#ifdef CONFIG_IPV6_MIP6
1592 case IPV6_SADDR_RULE_HOA:
1593 {
1594 /* Rule 4: Prefer home address */
1595 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1596 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1597 break;
1598 }
1599#endif
1600 case IPV6_SADDR_RULE_OIF:
1601 /* Rule 5: Prefer outgoing interface */
1602 ret = (!dst->ifindex ||
1603 dst->ifindex == score->ifa->idev->dev->ifindex);
1604 break;
1605 case IPV6_SADDR_RULE_LABEL:
1606 /* Rule 6: Prefer matching label */
1607 ret = ipv6_addr_label(net,
1608 &score->ifa->addr, score->addr_type,
1609 score->ifa->idev->dev->ifindex) == dst->label;
1610 break;
1611 case IPV6_SADDR_RULE_PRIVACY:
1612 {
1613 /* Rule 7: Prefer public address
1614 * Note: prefer temporary address if use_tempaddr >= 2
1615 */
1616 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1617 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1618 score->ifa->idev->cnf.use_tempaddr >= 2;
1619 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1620 break;
1621 }
1622 case IPV6_SADDR_RULE_ORCHID:
1623 /* Rule 8-: Prefer ORCHID vs ORCHID or
1624 * non-ORCHID vs non-ORCHID
1625 */
1626 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1627 ipv6_addr_orchid(dst->addr));
1628 break;
1629 case IPV6_SADDR_RULE_PREFIX:
1630 /* Rule 8: Use longest matching prefix */
1631 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1632 if (ret > score->ifa->prefix_len)
1633 ret = score->ifa->prefix_len;
1634 score->matchlen = ret;
1635 break;
1636#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1637 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1638 /* Optimistic addresses still have lower precedence than other
1639 * preferred addresses.
1640 */
1641 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1642 break;
1643#endif
1644 default:
1645 ret = 0;
1646 }
1647
1648 if (ret)
1649 __set_bit(i, score->scorebits);
1650 score->rule = i;
1651out:
1652 return ret;
1653}
1654
1655static int __ipv6_dev_get_saddr(struct net *net,
1656 struct ipv6_saddr_dst *dst,
1657 struct inet6_dev *idev,
1658 struct ipv6_saddr_score *scores,
1659 int hiscore_idx)
1660{
1661 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1662
1663 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1664 int i;
1665
1666 /*
1667 * - Tentative Address (RFC2462 section 5.4)
1668 * - A tentative address is not considered
1669 * "assigned to an interface" in the traditional
1670 * sense, unless it is also flagged as optimistic.
1671 * - Candidate Source Address (section 4)
1672 * - In any case, anycast addresses, multicast
1673 * addresses, and the unspecified address MUST
1674 * NOT be included in a candidate set.
1675 */
1676 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1677 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1678 continue;
1679
1680 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1681
1682 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1683 score->addr_type & IPV6_ADDR_MULTICAST)) {
1684 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1685 idev->dev->name);
1686 continue;
1687 }
1688
1689 score->rule = -1;
1690 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1691
1692 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1693 int minihiscore, miniscore;
1694
1695 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1696 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1697
1698 if (minihiscore > miniscore) {
1699 if (i == IPV6_SADDR_RULE_SCOPE &&
1700 score->scopedist > 0) {
1701 /*
1702 * special case:
1703 * each remaining entry
1704 * has too small (not enough)
1705 * scope, because ifa entries
1706 * are sorted by their scope
1707 * values.
1708 */
1709 goto out;
1710 }
1711 break;
1712 } else if (minihiscore < miniscore) {
1713 swap(hiscore, score);
1714 hiscore_idx = 1 - hiscore_idx;
1715
1716 /* restore our iterator */
1717 score->ifa = hiscore->ifa;
1718
1719 break;
1720 }
1721 }
1722 }
1723out:
1724 return hiscore_idx;
1725}
1726
1727static int ipv6_get_saddr_master(struct net *net,
1728 const struct net_device *dst_dev,
1729 const struct net_device *master,
1730 struct ipv6_saddr_dst *dst,
1731 struct ipv6_saddr_score *scores,
1732 int hiscore_idx)
1733{
1734 struct inet6_dev *idev;
1735
1736 idev = __in6_dev_get(dst_dev);
1737 if (idev)
1738 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1739 scores, hiscore_idx);
1740
1741 idev = __in6_dev_get(master);
1742 if (idev)
1743 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1744 scores, hiscore_idx);
1745
1746 return hiscore_idx;
1747}
1748
1749int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1750 const struct in6_addr *daddr, unsigned int prefs,
1751 struct in6_addr *saddr)
1752{
1753 struct ipv6_saddr_score scores[2], *hiscore;
1754 struct ipv6_saddr_dst dst;
1755 struct inet6_dev *idev;
1756 struct net_device *dev;
1757 int dst_type;
1758 bool use_oif_addr = false;
1759 int hiscore_idx = 0;
1760 int ret = 0;
1761
1762 dst_type = __ipv6_addr_type(daddr);
1763 dst.addr = daddr;
1764 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1765 dst.scope = __ipv6_addr_src_scope(dst_type);
1766 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1767 dst.prefs = prefs;
1768
1769 scores[hiscore_idx].rule = -1;
1770 scores[hiscore_idx].ifa = NULL;
1771
1772 rcu_read_lock();
1773
1774 /* Candidate Source Address (section 4)
1775 * - multicast and link-local destination address,
1776 * the set of candidate source address MUST only
1777 * include addresses assigned to interfaces
1778 * belonging to the same link as the outgoing
1779 * interface.
1780 * (- For site-local destination addresses, the
1781 * set of candidate source addresses MUST only
1782 * include addresses assigned to interfaces
1783 * belonging to the same site as the outgoing
1784 * interface.)
1785 * - "It is RECOMMENDED that the candidate source addresses
1786 * be the set of unicast addresses assigned to the
1787 * interface that will be used to send to the destination
1788 * (the 'outgoing' interface)." (RFC 6724)
1789 */
1790 if (dst_dev) {
1791 idev = __in6_dev_get(dst_dev);
1792 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1793 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1794 (idev && idev->cnf.use_oif_addrs_only)) {
1795 use_oif_addr = true;
1796 }
1797 }
1798
1799 if (use_oif_addr) {
1800 if (idev)
1801 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1802 } else {
1803 const struct net_device *master;
1804 int master_idx = 0;
1805
1806 /* if dst_dev exists and is enslaved to an L3 device, then
1807 * prefer addresses from dst_dev and then the master over
1808 * any other enslaved devices in the L3 domain.
1809 */
1810 master = l3mdev_master_dev_rcu(dst_dev);
1811 if (master) {
1812 master_idx = master->ifindex;
1813
1814 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1815 master, &dst,
1816 scores, hiscore_idx);
1817
1818 if (scores[hiscore_idx].ifa)
1819 goto out;
1820 }
1821
1822 for_each_netdev_rcu(net, dev) {
1823 /* only consider addresses on devices in the
1824 * same L3 domain
1825 */
1826 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1827 continue;
1828 idev = __in6_dev_get(dev);
1829 if (!idev)
1830 continue;
1831 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1832 }
1833 }
1834
1835out:
1836 hiscore = &scores[hiscore_idx];
1837 if (!hiscore->ifa)
1838 ret = -EADDRNOTAVAIL;
1839 else
1840 *saddr = hiscore->ifa->addr;
1841
1842 rcu_read_unlock();
1843 return ret;
1844}
1845EXPORT_SYMBOL(ipv6_dev_get_saddr);
1846
1847static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1848 u32 banned_flags)
1849{
1850 struct inet6_ifaddr *ifp;
1851 int err = -EADDRNOTAVAIL;
1852
1853 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1854 if (ifp->scope > IFA_LINK)
1855 break;
1856 if (ifp->scope == IFA_LINK &&
1857 !(ifp->flags & banned_flags)) {
1858 *addr = ifp->addr;
1859 err = 0;
1860 break;
1861 }
1862 }
1863 return err;
1864}
1865
1866int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1867 u32 banned_flags)
1868{
1869 struct inet6_dev *idev;
1870 int err = -EADDRNOTAVAIL;
1871
1872 rcu_read_lock();
1873 idev = __in6_dev_get(dev);
1874 if (idev) {
1875 read_lock_bh(&idev->lock);
1876 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1877 read_unlock_bh(&idev->lock);
1878 }
1879 rcu_read_unlock();
1880 return err;
1881}
1882
1883static int ipv6_count_addresses(const struct inet6_dev *idev)
1884{
1885 const struct inet6_ifaddr *ifp;
1886 int cnt = 0;
1887
1888 rcu_read_lock();
1889 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1890 cnt++;
1891 rcu_read_unlock();
1892 return cnt;
1893}
1894
1895int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1896 const struct net_device *dev, int strict)
1897{
1898 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1899 strict, IFA_F_TENTATIVE);
1900}
1901EXPORT_SYMBOL(ipv6_chk_addr);
1902
1903/* device argument is used to find the L3 domain of interest. If
1904 * skip_dev_check is set, then the ifp device is not checked against
1905 * the passed in dev argument. So the 2 cases for addresses checks are:
1906 * 1. does the address exist in the L3 domain that dev is part of
1907 * (skip_dev_check = true), or
1908 *
1909 * 2. does the address exist on the specific device
1910 * (skip_dev_check = false)
1911 */
1912static struct net_device *
1913__ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1914 const struct net_device *dev, bool skip_dev_check,
1915 int strict, u32 banned_flags)
1916{
1917 unsigned int hash = inet6_addr_hash(net, addr);
1918 struct net_device *l3mdev, *ndev;
1919 struct inet6_ifaddr *ifp;
1920 u32 ifp_flags;
1921
1922 rcu_read_lock();
1923
1924 l3mdev = l3mdev_master_dev_rcu(dev);
1925 if (skip_dev_check)
1926 dev = NULL;
1927
1928 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1929 ndev = ifp->idev->dev;
1930
1931 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1932 continue;
1933
1934 /* Decouple optimistic from tentative for evaluation here.
1935 * Ban optimistic addresses explicitly, when required.
1936 */
1937 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1938 ? (ifp->flags&~IFA_F_TENTATIVE)
1939 : ifp->flags;
1940 if (ipv6_addr_equal(&ifp->addr, addr) &&
1941 !(ifp_flags&banned_flags) &&
1942 (!dev || ndev == dev ||
1943 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1944 rcu_read_unlock();
1945 return ndev;
1946 }
1947 }
1948
1949 rcu_read_unlock();
1950 return NULL;
1951}
1952
1953int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1954 const struct net_device *dev, bool skip_dev_check,
1955 int strict, u32 banned_flags)
1956{
1957 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
1958 strict, banned_flags) ? 1 : 0;
1959}
1960EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1961
1962
1963/* Compares an address/prefix_len with addresses on device @dev.
1964 * If one is found it returns true.
1965 */
1966bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1967 const unsigned int prefix_len, struct net_device *dev)
1968{
1969 const struct inet6_ifaddr *ifa;
1970 const struct inet6_dev *idev;
1971 bool ret = false;
1972
1973 rcu_read_lock();
1974 idev = __in6_dev_get(dev);
1975 if (idev) {
1976 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1977 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1978 if (ret)
1979 break;
1980 }
1981 }
1982 rcu_read_unlock();
1983
1984 return ret;
1985}
1986EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1987
1988int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1989{
1990 const struct inet6_ifaddr *ifa;
1991 const struct inet6_dev *idev;
1992 int onlink;
1993
1994 onlink = 0;
1995 rcu_read_lock();
1996 idev = __in6_dev_get(dev);
1997 if (idev) {
1998 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1999 onlink = ipv6_prefix_equal(addr, &ifa->addr,
2000 ifa->prefix_len);
2001 if (onlink)
2002 break;
2003 }
2004 }
2005 rcu_read_unlock();
2006 return onlink;
2007}
2008EXPORT_SYMBOL(ipv6_chk_prefix);
2009
2010/**
2011 * ipv6_dev_find - find the first device with a given source address.
2012 * @net: the net namespace
2013 * @addr: the source address
2014 * @dev: used to find the L3 domain of interest
2015 *
2016 * The caller should be protected by RCU, or RTNL.
2017 */
2018struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2019 struct net_device *dev)
2020{
2021 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2022 IFA_F_TENTATIVE);
2023}
2024EXPORT_SYMBOL(ipv6_dev_find);
2025
2026struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2027 struct net_device *dev, int strict)
2028{
2029 unsigned int hash = inet6_addr_hash(net, addr);
2030 struct inet6_ifaddr *ifp, *result = NULL;
2031
2032 rcu_read_lock();
2033 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
2034 if (ipv6_addr_equal(&ifp->addr, addr)) {
2035 if (!dev || ifp->idev->dev == dev ||
2036 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2037 result = ifp;
2038 in6_ifa_hold(ifp);
2039 break;
2040 }
2041 }
2042 }
2043 rcu_read_unlock();
2044
2045 return result;
2046}
2047
2048/* Gets referenced address, destroys ifaddr */
2049
2050static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2051{
2052 if (dad_failed)
2053 ifp->flags |= IFA_F_DADFAILED;
2054
2055 if (ifp->flags&IFA_F_TEMPORARY) {
2056 struct inet6_ifaddr *ifpub;
2057 spin_lock_bh(&ifp->lock);
2058 ifpub = ifp->ifpub;
2059 if (ifpub) {
2060 in6_ifa_hold(ifpub);
2061 spin_unlock_bh(&ifp->lock);
2062 ipv6_create_tempaddr(ifpub, true);
2063 in6_ifa_put(ifpub);
2064 } else {
2065 spin_unlock_bh(&ifp->lock);
2066 }
2067 ipv6_del_addr(ifp);
2068 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2069 spin_lock_bh(&ifp->lock);
2070 addrconf_del_dad_work(ifp);
2071 ifp->flags |= IFA_F_TENTATIVE;
2072 if (dad_failed)
2073 ifp->flags &= ~IFA_F_OPTIMISTIC;
2074 spin_unlock_bh(&ifp->lock);
2075 if (dad_failed)
2076 ipv6_ifa_notify(0, ifp);
2077 in6_ifa_put(ifp);
2078 } else {
2079 ipv6_del_addr(ifp);
2080 }
2081}
2082
2083static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2084{
2085 int err = -ENOENT;
2086
2087 spin_lock_bh(&ifp->lock);
2088 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2089 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2090 err = 0;
2091 }
2092 spin_unlock_bh(&ifp->lock);
2093
2094 return err;
2095}
2096
2097void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2098{
2099 struct inet6_dev *idev = ifp->idev;
2100 struct net *net = dev_net(idev->dev);
2101
2102 if (addrconf_dad_end(ifp)) {
2103 in6_ifa_put(ifp);
2104 return;
2105 }
2106
2107 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2108 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2109
2110 spin_lock_bh(&ifp->lock);
2111
2112 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2113 struct in6_addr new_addr;
2114 struct inet6_ifaddr *ifp2;
2115 int retries = ifp->stable_privacy_retry + 1;
2116 struct ifa6_config cfg = {
2117 .pfx = &new_addr,
2118 .plen = ifp->prefix_len,
2119 .ifa_flags = ifp->flags,
2120 .valid_lft = ifp->valid_lft,
2121 .preferred_lft = ifp->prefered_lft,
2122 .scope = ifp->scope,
2123 };
2124
2125 if (retries > net->ipv6.sysctl.idgen_retries) {
2126 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2127 ifp->idev->dev->name);
2128 goto errdad;
2129 }
2130
2131 new_addr = ifp->addr;
2132 if (ipv6_generate_stable_address(&new_addr, retries,
2133 idev))
2134 goto errdad;
2135
2136 spin_unlock_bh(&ifp->lock);
2137
2138 if (idev->cnf.max_addresses &&
2139 ipv6_count_addresses(idev) >=
2140 idev->cnf.max_addresses)
2141 goto lock_errdad;
2142
2143 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2144 ifp->idev->dev->name);
2145
2146 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2147 if (IS_ERR(ifp2))
2148 goto lock_errdad;
2149
2150 spin_lock_bh(&ifp2->lock);
2151 ifp2->stable_privacy_retry = retries;
2152 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2153 spin_unlock_bh(&ifp2->lock);
2154
2155 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2156 in6_ifa_put(ifp2);
2157lock_errdad:
2158 spin_lock_bh(&ifp->lock);
2159 }
2160
2161errdad:
2162 /* transition from _POSTDAD to _ERRDAD */
2163 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2164 spin_unlock_bh(&ifp->lock);
2165
2166 addrconf_mod_dad_work(ifp, 0);
2167 in6_ifa_put(ifp);
2168}
2169
2170/* Join to solicited addr multicast group.
2171 * caller must hold RTNL */
2172void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2173{
2174 struct in6_addr maddr;
2175
2176 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2177 return;
2178
2179 addrconf_addr_solict_mult(addr, &maddr);
2180 ipv6_dev_mc_inc(dev, &maddr);
2181}
2182
2183/* caller must hold RTNL */
2184void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2185{
2186 struct in6_addr maddr;
2187
2188 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2189 return;
2190
2191 addrconf_addr_solict_mult(addr, &maddr);
2192 __ipv6_dev_mc_dec(idev, &maddr);
2193}
2194
2195/* caller must hold RTNL */
2196static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2197{
2198 struct in6_addr addr;
2199
2200 if (ifp->prefix_len >= 127) /* RFC 6164 */
2201 return;
2202 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2203 if (ipv6_addr_any(&addr))
2204 return;
2205 __ipv6_dev_ac_inc(ifp->idev, &addr);
2206}
2207
2208/* caller must hold RTNL */
2209static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2210{
2211 struct in6_addr addr;
2212
2213 if (ifp->prefix_len >= 127) /* RFC 6164 */
2214 return;
2215 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2216 if (ipv6_addr_any(&addr))
2217 return;
2218 __ipv6_dev_ac_dec(ifp->idev, &addr);
2219}
2220
2221static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2222{
2223 switch (dev->addr_len) {
2224 case ETH_ALEN:
2225 memcpy(eui, dev->dev_addr, 3);
2226 eui[3] = 0xFF;
2227 eui[4] = 0xFE;
2228 memcpy(eui + 5, dev->dev_addr + 3, 3);
2229 break;
2230 case EUI64_ADDR_LEN:
2231 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2232 eui[0] ^= 2;
2233 break;
2234 default:
2235 return -1;
2236 }
2237
2238 return 0;
2239}
2240
2241static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2242{
2243 const union fwnet_hwaddr *ha;
2244
2245 if (dev->addr_len != FWNET_ALEN)
2246 return -1;
2247
2248 ha = (const union fwnet_hwaddr *)dev->dev_addr;
2249
2250 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2251 eui[0] ^= 2;
2252 return 0;
2253}
2254
2255static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2256{
2257 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2258 if (dev->addr_len != ARCNET_ALEN)
2259 return -1;
2260 memset(eui, 0, 7);
2261 eui[7] = *(u8 *)dev->dev_addr;
2262 return 0;
2263}
2264
2265static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2266{
2267 if (dev->addr_len != INFINIBAND_ALEN)
2268 return -1;
2269 memcpy(eui, dev->dev_addr + 12, 8);
2270 eui[0] |= 2;
2271 return 0;
2272}
2273
2274static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2275{
2276 if (addr == 0)
2277 return -1;
2278 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2279 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2280 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2281 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2282 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2283 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2284 eui[1] = 0;
2285 eui[2] = 0x5E;
2286 eui[3] = 0xFE;
2287 memcpy(eui + 4, &addr, 4);
2288 return 0;
2289}
2290
2291static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2292{
2293 if (dev->priv_flags & IFF_ISATAP)
2294 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2295 return -1;
2296}
2297
2298static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2299{
2300 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2301}
2302
2303static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2304{
2305 memcpy(eui, dev->perm_addr, 3);
2306 memcpy(eui + 5, dev->perm_addr + 3, 3);
2307 eui[3] = 0xFF;
2308 eui[4] = 0xFE;
2309 eui[0] ^= 2;
2310 return 0;
2311}
2312
2313static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2314{
2315 switch (dev->type) {
2316 case ARPHRD_ETHER:
2317 case ARPHRD_FDDI:
2318 return addrconf_ifid_eui48(eui, dev);
2319 case ARPHRD_ARCNET:
2320 return addrconf_ifid_arcnet(eui, dev);
2321 case ARPHRD_INFINIBAND:
2322 return addrconf_ifid_infiniband(eui, dev);
2323 case ARPHRD_SIT:
2324 return addrconf_ifid_sit(eui, dev);
2325 case ARPHRD_IPGRE:
2326 case ARPHRD_TUNNEL:
2327 return addrconf_ifid_gre(eui, dev);
2328 case ARPHRD_6LOWPAN:
2329 return addrconf_ifid_6lowpan(eui, dev);
2330 case ARPHRD_IEEE1394:
2331 return addrconf_ifid_ieee1394(eui, dev);
2332 case ARPHRD_TUNNEL6:
2333 case ARPHRD_IP6GRE:
2334 case ARPHRD_RAWIP:
2335 return addrconf_ifid_ip6tnl(eui, dev);
2336 }
2337 return -1;
2338}
2339
2340static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2341{
2342 int err = -1;
2343 struct inet6_ifaddr *ifp;
2344
2345 read_lock_bh(&idev->lock);
2346 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2347 if (ifp->scope > IFA_LINK)
2348 break;
2349 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2350 memcpy(eui, ifp->addr.s6_addr+8, 8);
2351 err = 0;
2352 break;
2353 }
2354 }
2355 read_unlock_bh(&idev->lock);
2356 return err;
2357}
2358
2359/* Generation of a randomized Interface Identifier
2360 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2361 */
2362
2363static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2364{
2365regen:
2366 get_random_bytes(&addr->s6_addr[8], 8);
2367
2368 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2369 * check if generated address is not inappropriate:
2370 *
2371 * - Reserved IPv6 Interface Identifiers
2372 * - XXX: already assigned to an address on the device
2373 */
2374
2375 /* Subnet-router anycast: 0000:0000:0000:0000 */
2376 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2377 goto regen;
2378
2379 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2380 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2381 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2382 */
2383 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2384 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2385 goto regen;
2386
2387 /* Reserved subnet anycast addresses */
2388 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2389 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2390 goto regen;
2391}
2392
2393/*
2394 * Add prefix route.
2395 */
2396
2397static void
2398addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2399 struct net_device *dev, unsigned long expires,
2400 u32 flags, gfp_t gfp_flags)
2401{
2402 struct fib6_config cfg = {
2403 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2404 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2405 .fc_ifindex = dev->ifindex,
2406 .fc_expires = expires,
2407 .fc_dst_len = plen,
2408 .fc_flags = RTF_UP | flags,
2409 .fc_nlinfo.nl_net = dev_net(dev),
2410 .fc_protocol = RTPROT_KERNEL,
2411 .fc_type = RTN_UNICAST,
2412 };
2413
2414 cfg.fc_dst = *pfx;
2415
2416 /* Prevent useless cloning on PtP SIT.
2417 This thing is done here expecting that the whole
2418 class of non-broadcast devices need not cloning.
2419 */
2420#if IS_ENABLED(CONFIG_IPV6_SIT)
2421 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2422 cfg.fc_flags |= RTF_NONEXTHOP;
2423#endif
2424
2425 ip6_route_add(&cfg, gfp_flags, NULL);
2426}
2427
2428
2429static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2430 int plen,
2431 const struct net_device *dev,
2432 u32 flags, u32 noflags,
2433 bool no_gw)
2434{
2435 struct fib6_node *fn;
2436 struct fib6_info *rt = NULL;
2437 struct fib6_table *table;
2438 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2439
2440 table = fib6_get_table(dev_net(dev), tb_id);
2441 if (!table)
2442 return NULL;
2443
2444 rcu_read_lock();
2445 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2446 if (!fn)
2447 goto out;
2448
2449 for_each_fib6_node_rt_rcu(fn) {
2450 /* prefix routes only use builtin fib6_nh */
2451 if (rt->nh)
2452 continue;
2453
2454 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2455 continue;
2456 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2457 continue;
2458 if ((rt->fib6_flags & flags) != flags)
2459 continue;
2460 if ((rt->fib6_flags & noflags) != 0)
2461 continue;
2462 if (!fib6_info_hold_safe(rt))
2463 continue;
2464 break;
2465 }
2466out:
2467 rcu_read_unlock();
2468 return rt;
2469}
2470
2471
2472/* Create "default" multicast route to the interface */
2473
2474static void addrconf_add_mroute(struct net_device *dev)
2475{
2476 struct fib6_config cfg = {
2477 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2478 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2479 .fc_ifindex = dev->ifindex,
2480 .fc_dst_len = 8,
2481 .fc_flags = RTF_UP,
2482 .fc_type = RTN_MULTICAST,
2483 .fc_nlinfo.nl_net = dev_net(dev),
2484 .fc_protocol = RTPROT_KERNEL,
2485 };
2486
2487 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2488
2489 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2490}
2491
2492static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2493{
2494 struct inet6_dev *idev;
2495
2496 ASSERT_RTNL();
2497
2498 idev = ipv6_find_idev(dev);
2499 if (IS_ERR(idev))
2500 return idev;
2501
2502 if (idev->cnf.disable_ipv6)
2503 return ERR_PTR(-EACCES);
2504
2505 /* Add default multicast route */
2506 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2507 addrconf_add_mroute(dev);
2508
2509 return idev;
2510}
2511
2512static void manage_tempaddrs(struct inet6_dev *idev,
2513 struct inet6_ifaddr *ifp,
2514 __u32 valid_lft, __u32 prefered_lft,
2515 bool create, unsigned long now)
2516{
2517 u32 flags;
2518 struct inet6_ifaddr *ift;
2519
2520 read_lock_bh(&idev->lock);
2521 /* update all temporary addresses in the list */
2522 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2523 int age, max_valid, max_prefered;
2524
2525 if (ifp != ift->ifpub)
2526 continue;
2527
2528 /* RFC 4941 section 3.3:
2529 * If a received option will extend the lifetime of a public
2530 * address, the lifetimes of temporary addresses should
2531 * be extended, subject to the overall constraint that no
2532 * temporary addresses should ever remain "valid" or "preferred"
2533 * for a time longer than (TEMP_VALID_LIFETIME) or
2534 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2535 */
2536 age = (now - ift->cstamp) / HZ;
2537 max_valid = idev->cnf.temp_valid_lft - age;
2538 if (max_valid < 0)
2539 max_valid = 0;
2540
2541 max_prefered = idev->cnf.temp_prefered_lft -
2542 idev->desync_factor - age;
2543 if (max_prefered < 0)
2544 max_prefered = 0;
2545
2546 if (valid_lft > max_valid)
2547 valid_lft = max_valid;
2548
2549 if (prefered_lft > max_prefered)
2550 prefered_lft = max_prefered;
2551
2552 spin_lock(&ift->lock);
2553 flags = ift->flags;
2554 ift->valid_lft = valid_lft;
2555 ift->prefered_lft = prefered_lft;
2556 ift->tstamp = now;
2557 if (prefered_lft > 0)
2558 ift->flags &= ~IFA_F_DEPRECATED;
2559
2560 spin_unlock(&ift->lock);
2561 if (!(flags&IFA_F_TENTATIVE))
2562 ipv6_ifa_notify(0, ift);
2563 }
2564
2565 if ((create || list_empty(&idev->tempaddr_list)) &&
2566 idev->cnf.use_tempaddr > 0) {
2567 /* When a new public address is created as described
2568 * in [ADDRCONF], also create a new temporary address.
2569 * Also create a temporary address if it's enabled but
2570 * no temporary address currently exists.
2571 */
2572 read_unlock_bh(&idev->lock);
2573 ipv6_create_tempaddr(ifp, false);
2574 } else {
2575 read_unlock_bh(&idev->lock);
2576 }
2577}
2578
2579static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2580{
2581 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2582 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2583}
2584
2585int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2586 const struct prefix_info *pinfo,
2587 struct inet6_dev *in6_dev,
2588 const struct in6_addr *addr, int addr_type,
2589 u32 addr_flags, bool sllao, bool tokenized,
2590 __u32 valid_lft, u32 prefered_lft)
2591{
2592 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2593 int create = 0, update_lft = 0;
2594
2595 if (!ifp && valid_lft) {
2596 int max_addresses = in6_dev->cnf.max_addresses;
2597 struct ifa6_config cfg = {
2598 .pfx = addr,
2599 .plen = pinfo->prefix_len,
2600 .ifa_flags = addr_flags,
2601 .valid_lft = valid_lft,
2602 .preferred_lft = prefered_lft,
2603 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2604 .ifa_proto = IFAPROT_KERNEL_RA
2605 };
2606
2607#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2608 if ((net->ipv6.devconf_all->optimistic_dad ||
2609 in6_dev->cnf.optimistic_dad) &&
2610 !net->ipv6.devconf_all->forwarding && sllao)
2611 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2612#endif
2613
2614 /* Do not allow to create too much of autoconfigured
2615 * addresses; this would be too easy way to crash kernel.
2616 */
2617 if (!max_addresses ||
2618 ipv6_count_addresses(in6_dev) < max_addresses)
2619 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2620
2621 if (IS_ERR_OR_NULL(ifp))
2622 return -1;
2623
2624 create = 1;
2625 spin_lock_bh(&ifp->lock);
2626 ifp->flags |= IFA_F_MANAGETEMPADDR;
2627 ifp->cstamp = jiffies;
2628 ifp->tokenized = tokenized;
2629 spin_unlock_bh(&ifp->lock);
2630 addrconf_dad_start(ifp);
2631 }
2632
2633 if (ifp) {
2634 u32 flags;
2635 unsigned long now;
2636 u32 stored_lft;
2637
2638 /* update lifetime (RFC2462 5.5.3 e) */
2639 spin_lock_bh(&ifp->lock);
2640 now = jiffies;
2641 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2642 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2643 else
2644 stored_lft = 0;
2645 if (!create && stored_lft) {
2646 const u32 minimum_lft = min_t(u32,
2647 stored_lft, MIN_VALID_LIFETIME);
2648 valid_lft = max(valid_lft, minimum_lft);
2649
2650 /* RFC4862 Section 5.5.3e:
2651 * "Note that the preferred lifetime of the
2652 * corresponding address is always reset to
2653 * the Preferred Lifetime in the received
2654 * Prefix Information option, regardless of
2655 * whether the valid lifetime is also reset or
2656 * ignored."
2657 *
2658 * So we should always update prefered_lft here.
2659 */
2660 update_lft = 1;
2661 }
2662
2663 if (update_lft) {
2664 ifp->valid_lft = valid_lft;
2665 ifp->prefered_lft = prefered_lft;
2666 ifp->tstamp = now;
2667 flags = ifp->flags;
2668 ifp->flags &= ~IFA_F_DEPRECATED;
2669 spin_unlock_bh(&ifp->lock);
2670
2671 if (!(flags&IFA_F_TENTATIVE))
2672 ipv6_ifa_notify(0, ifp);
2673 } else
2674 spin_unlock_bh(&ifp->lock);
2675
2676 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2677 create, now);
2678
2679 in6_ifa_put(ifp);
2680 addrconf_verify(net);
2681 }
2682
2683 return 0;
2684}
2685EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2686
2687void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2688{
2689 struct prefix_info *pinfo;
2690 __u32 valid_lft;
2691 __u32 prefered_lft;
2692 int addr_type, err;
2693 u32 addr_flags = 0;
2694 struct inet6_dev *in6_dev;
2695 struct net *net = dev_net(dev);
2696
2697 pinfo = (struct prefix_info *) opt;
2698
2699 if (len < sizeof(struct prefix_info)) {
2700 netdev_dbg(dev, "addrconf: prefix option too short\n");
2701 return;
2702 }
2703
2704 /*
2705 * Validation checks ([ADDRCONF], page 19)
2706 */
2707
2708 addr_type = ipv6_addr_type(&pinfo->prefix);
2709
2710 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2711 return;
2712
2713 valid_lft = ntohl(pinfo->valid);
2714 prefered_lft = ntohl(pinfo->prefered);
2715
2716 if (prefered_lft > valid_lft) {
2717 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2718 return;
2719 }
2720
2721 in6_dev = in6_dev_get(dev);
2722
2723 if (!in6_dev) {
2724 net_dbg_ratelimited("addrconf: device %s not configured\n",
2725 dev->name);
2726 return;
2727 }
2728
2729 /*
2730 * Two things going on here:
2731 * 1) Add routes for on-link prefixes
2732 * 2) Configure prefixes with the auto flag set
2733 */
2734
2735 if (pinfo->onlink) {
2736 struct fib6_info *rt;
2737 unsigned long rt_expires;
2738
2739 /* Avoid arithmetic overflow. Really, we could
2740 * save rt_expires in seconds, likely valid_lft,
2741 * but it would require division in fib gc, that it
2742 * not good.
2743 */
2744 if (HZ > USER_HZ)
2745 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2746 else
2747 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2748
2749 if (addrconf_finite_timeout(rt_expires))
2750 rt_expires *= HZ;
2751
2752 rt = addrconf_get_prefix_route(&pinfo->prefix,
2753 pinfo->prefix_len,
2754 dev,
2755 RTF_ADDRCONF | RTF_PREFIX_RT,
2756 RTF_DEFAULT, true);
2757
2758 if (rt) {
2759 /* Autoconf prefix route */
2760 if (valid_lft == 0) {
2761 ip6_del_rt(net, rt, false);
2762 rt = NULL;
2763 } else if (addrconf_finite_timeout(rt_expires)) {
2764 /* not infinity */
2765 fib6_set_expires(rt, jiffies + rt_expires);
2766 } else {
2767 fib6_clean_expires(rt);
2768 }
2769 } else if (valid_lft) {
2770 clock_t expires = 0;
2771 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2772 if (addrconf_finite_timeout(rt_expires)) {
2773 /* not infinity */
2774 flags |= RTF_EXPIRES;
2775 expires = jiffies_to_clock_t(rt_expires);
2776 }
2777 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2778 0, dev, expires, flags,
2779 GFP_ATOMIC);
2780 }
2781 fib6_info_release(rt);
2782 }
2783
2784 /* Try to figure out our local address for this prefix */
2785
2786 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2787 struct in6_addr addr;
2788 bool tokenized = false, dev_addr_generated = false;
2789
2790 if (pinfo->prefix_len == 64) {
2791 memcpy(&addr, &pinfo->prefix, 8);
2792
2793 if (!ipv6_addr_any(&in6_dev->token)) {
2794 read_lock_bh(&in6_dev->lock);
2795 memcpy(addr.s6_addr + 8,
2796 in6_dev->token.s6_addr + 8, 8);
2797 read_unlock_bh(&in6_dev->lock);
2798 tokenized = true;
2799 } else if (is_addr_mode_generate_stable(in6_dev) &&
2800 !ipv6_generate_stable_address(&addr, 0,
2801 in6_dev)) {
2802 addr_flags |= IFA_F_STABLE_PRIVACY;
2803 goto ok;
2804 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2805 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2806 goto put;
2807 } else {
2808 dev_addr_generated = true;
2809 }
2810 goto ok;
2811 }
2812 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2813 pinfo->prefix_len);
2814 goto put;
2815
2816ok:
2817 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2818 &addr, addr_type,
2819 addr_flags, sllao,
2820 tokenized, valid_lft,
2821 prefered_lft);
2822 if (err)
2823 goto put;
2824
2825 /* Ignore error case here because previous prefix add addr was
2826 * successful which will be notified.
2827 */
2828 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2829 addr_type, addr_flags, sllao,
2830 tokenized, valid_lft,
2831 prefered_lft,
2832 dev_addr_generated);
2833 }
2834 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2835put:
2836 in6_dev_put(in6_dev);
2837}
2838
2839static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2840 struct in6_ifreq *ireq)
2841{
2842 struct ip_tunnel_parm p = { };
2843 int err;
2844
2845 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2846 return -EADDRNOTAVAIL;
2847
2848 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2849 p.iph.version = 4;
2850 p.iph.ihl = 5;
2851 p.iph.protocol = IPPROTO_IPV6;
2852 p.iph.ttl = 64;
2853
2854 if (!dev->netdev_ops->ndo_tunnel_ctl)
2855 return -EOPNOTSUPP;
2856 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2857 if (err)
2858 return err;
2859
2860 dev = __dev_get_by_name(net, p.name);
2861 if (!dev)
2862 return -ENOBUFS;
2863 return dev_open(dev, NULL);
2864}
2865
2866/*
2867 * Set destination address.
2868 * Special case for SIT interfaces where we create a new "virtual"
2869 * device.
2870 */
2871int addrconf_set_dstaddr(struct net *net, void __user *arg)
2872{
2873 struct net_device *dev;
2874 struct in6_ifreq ireq;
2875 int err = -ENODEV;
2876
2877 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2878 return -ENODEV;
2879 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2880 return -EFAULT;
2881
2882 rtnl_lock();
2883 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2884 if (dev && dev->type == ARPHRD_SIT)
2885 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2886 rtnl_unlock();
2887 return err;
2888}
2889
2890static int ipv6_mc_config(struct sock *sk, bool join,
2891 const struct in6_addr *addr, int ifindex)
2892{
2893 int ret;
2894
2895 ASSERT_RTNL();
2896
2897 lock_sock(sk);
2898 if (join)
2899 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2900 else
2901 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2902 release_sock(sk);
2903
2904 return ret;
2905}
2906
2907/*
2908 * Manual configuration of address on an interface
2909 */
2910static int inet6_addr_add(struct net *net, int ifindex,
2911 struct ifa6_config *cfg,
2912 struct netlink_ext_ack *extack)
2913{
2914 struct inet6_ifaddr *ifp;
2915 struct inet6_dev *idev;
2916 struct net_device *dev;
2917 unsigned long timeout;
2918 clock_t expires;
2919 u32 flags;
2920
2921 ASSERT_RTNL();
2922
2923 if (cfg->plen > 128)
2924 return -EINVAL;
2925
2926 /* check the lifetime */
2927 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2928 return -EINVAL;
2929
2930 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2931 return -EINVAL;
2932
2933 dev = __dev_get_by_index(net, ifindex);
2934 if (!dev)
2935 return -ENODEV;
2936
2937 idev = addrconf_add_dev(dev);
2938 if (IS_ERR(idev))
2939 return PTR_ERR(idev);
2940
2941 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2942 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2943 true, cfg->pfx, ifindex);
2944
2945 if (ret < 0)
2946 return ret;
2947 }
2948
2949 cfg->scope = ipv6_addr_scope(cfg->pfx);
2950
2951 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2952 if (addrconf_finite_timeout(timeout)) {
2953 expires = jiffies_to_clock_t(timeout * HZ);
2954 cfg->valid_lft = timeout;
2955 flags = RTF_EXPIRES;
2956 } else {
2957 expires = 0;
2958 flags = 0;
2959 cfg->ifa_flags |= IFA_F_PERMANENT;
2960 }
2961
2962 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2963 if (addrconf_finite_timeout(timeout)) {
2964 if (timeout == 0)
2965 cfg->ifa_flags |= IFA_F_DEPRECATED;
2966 cfg->preferred_lft = timeout;
2967 }
2968
2969 ifp = ipv6_add_addr(idev, cfg, true, extack);
2970 if (!IS_ERR(ifp)) {
2971 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2972 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2973 ifp->rt_priority, dev, expires,
2974 flags, GFP_KERNEL);
2975 }
2976
2977 /* Send a netlink notification if DAD is enabled and
2978 * optimistic flag is not set
2979 */
2980 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2981 ipv6_ifa_notify(0, ifp);
2982 /*
2983 * Note that section 3.1 of RFC 4429 indicates
2984 * that the Optimistic flag should not be set for
2985 * manually configured addresses
2986 */
2987 addrconf_dad_start(ifp);
2988 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2989 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2990 cfg->preferred_lft, true, jiffies);
2991 in6_ifa_put(ifp);
2992 addrconf_verify_rtnl(net);
2993 return 0;
2994 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2995 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2996 cfg->pfx, ifindex);
2997 }
2998
2999 return PTR_ERR(ifp);
3000}
3001
3002static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3003 const struct in6_addr *pfx, unsigned int plen)
3004{
3005 struct inet6_ifaddr *ifp;
3006 struct inet6_dev *idev;
3007 struct net_device *dev;
3008
3009 if (plen > 128)
3010 return -EINVAL;
3011
3012 dev = __dev_get_by_index(net, ifindex);
3013 if (!dev)
3014 return -ENODEV;
3015
3016 idev = __in6_dev_get(dev);
3017 if (!idev)
3018 return -ENXIO;
3019
3020 read_lock_bh(&idev->lock);
3021 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3022 if (ifp->prefix_len == plen &&
3023 ipv6_addr_equal(pfx, &ifp->addr)) {
3024 in6_ifa_hold(ifp);
3025 read_unlock_bh(&idev->lock);
3026
3027 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3028 (ifa_flags & IFA_F_MANAGETEMPADDR))
3029 manage_tempaddrs(idev, ifp, 0, 0, false,
3030 jiffies);
3031 ipv6_del_addr(ifp);
3032 addrconf_verify_rtnl(net);
3033 if (ipv6_addr_is_multicast(pfx)) {
3034 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3035 false, pfx, dev->ifindex);
3036 }
3037 return 0;
3038 }
3039 }
3040 read_unlock_bh(&idev->lock);
3041 return -EADDRNOTAVAIL;
3042}
3043
3044
3045int addrconf_add_ifaddr(struct net *net, void __user *arg)
3046{
3047 struct ifa6_config cfg = {
3048 .ifa_flags = IFA_F_PERMANENT,
3049 .preferred_lft = INFINITY_LIFE_TIME,
3050 .valid_lft = INFINITY_LIFE_TIME,
3051 };
3052 struct in6_ifreq ireq;
3053 int err;
3054
3055 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3056 return -EPERM;
3057
3058 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3059 return -EFAULT;
3060
3061 cfg.pfx = &ireq.ifr6_addr;
3062 cfg.plen = ireq.ifr6_prefixlen;
3063
3064 rtnl_lock();
3065 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3066 rtnl_unlock();
3067 return err;
3068}
3069
3070int addrconf_del_ifaddr(struct net *net, void __user *arg)
3071{
3072 struct in6_ifreq ireq;
3073 int err;
3074
3075 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3076 return -EPERM;
3077
3078 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3079 return -EFAULT;
3080
3081 rtnl_lock();
3082 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3083 ireq.ifr6_prefixlen);
3084 rtnl_unlock();
3085 return err;
3086}
3087
3088static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3089 int plen, int scope, u8 proto)
3090{
3091 struct inet6_ifaddr *ifp;
3092 struct ifa6_config cfg = {
3093 .pfx = addr,
3094 .plen = plen,
3095 .ifa_flags = IFA_F_PERMANENT,
3096 .valid_lft = INFINITY_LIFE_TIME,
3097 .preferred_lft = INFINITY_LIFE_TIME,
3098 .scope = scope,
3099 .ifa_proto = proto
3100 };
3101
3102 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3103 if (!IS_ERR(ifp)) {
3104 spin_lock_bh(&ifp->lock);
3105 ifp->flags &= ~IFA_F_TENTATIVE;
3106 spin_unlock_bh(&ifp->lock);
3107 rt_genid_bump_ipv6(dev_net(idev->dev));
3108 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3109 in6_ifa_put(ifp);
3110 }
3111}
3112
3113#if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3114static void add_v4_addrs(struct inet6_dev *idev)
3115{
3116 struct in6_addr addr;
3117 struct net_device *dev;
3118 struct net *net = dev_net(idev->dev);
3119 int scope, plen, offset = 0;
3120 u32 pflags = 0;
3121
3122 ASSERT_RTNL();
3123
3124 memset(&addr, 0, sizeof(struct in6_addr));
3125 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */
3126 if (idev->dev->addr_len == sizeof(struct in6_addr))
3127 offset = sizeof(struct in6_addr) - 4;
3128 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
3129
3130 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) {
3131 scope = IPV6_ADDR_COMPATv4;
3132 plen = 96;
3133 pflags |= RTF_NONEXTHOP;
3134 } else {
3135 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3136 return;
3137
3138 addr.s6_addr32[0] = htonl(0xfe800000);
3139 scope = IFA_LINK;
3140 plen = 64;
3141 }
3142
3143 if (addr.s6_addr32[3]) {
3144 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC);
3145 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3146 GFP_KERNEL);
3147 return;
3148 }
3149
3150 for_each_netdev(net, dev) {
3151 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3152 if (in_dev && (dev->flags & IFF_UP)) {
3153 struct in_ifaddr *ifa;
3154 int flag = scope;
3155
3156 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3157 addr.s6_addr32[3] = ifa->ifa_local;
3158
3159 if (ifa->ifa_scope == RT_SCOPE_LINK)
3160 continue;
3161 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3162 if (idev->dev->flags&IFF_POINTOPOINT)
3163 continue;
3164 flag |= IFA_HOST;
3165 }
3166
3167 add_addr(idev, &addr, plen, flag,
3168 IFAPROT_UNSPEC);
3169 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3170 0, pflags, GFP_KERNEL);
3171 }
3172 }
3173 }
3174}
3175#endif
3176
3177static void init_loopback(struct net_device *dev)
3178{
3179 struct inet6_dev *idev;
3180
3181 /* ::1 */
3182
3183 ASSERT_RTNL();
3184
3185 idev = ipv6_find_idev(dev);
3186 if (IS_ERR(idev)) {
3187 pr_debug("%s: add_dev failed\n", __func__);
3188 return;
3189 }
3190
3191 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO);
3192}
3193
3194void addrconf_add_linklocal(struct inet6_dev *idev,
3195 const struct in6_addr *addr, u32 flags)
3196{
3197 struct ifa6_config cfg = {
3198 .pfx = addr,
3199 .plen = 64,
3200 .ifa_flags = flags | IFA_F_PERMANENT,
3201 .valid_lft = INFINITY_LIFE_TIME,
3202 .preferred_lft = INFINITY_LIFE_TIME,
3203 .scope = IFA_LINK,
3204 .ifa_proto = IFAPROT_KERNEL_LL
3205 };
3206 struct inet6_ifaddr *ifp;
3207
3208#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3209 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3210 idev->cnf.optimistic_dad) &&
3211 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3212 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3213#endif
3214
3215 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3216 if (!IS_ERR(ifp)) {
3217 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3218 0, 0, GFP_ATOMIC);
3219 addrconf_dad_start(ifp);
3220 in6_ifa_put(ifp);
3221 }
3222}
3223EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3224
3225static bool ipv6_reserved_interfaceid(struct in6_addr address)
3226{
3227 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3228 return true;
3229
3230 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3231 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3232 return true;
3233
3234 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3235 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3236 return true;
3237
3238 return false;
3239}
3240
3241static int ipv6_generate_stable_address(struct in6_addr *address,
3242 u8 dad_count,
3243 const struct inet6_dev *idev)
3244{
3245 static DEFINE_SPINLOCK(lock);
3246 static __u32 digest[SHA1_DIGEST_WORDS];
3247 static __u32 workspace[SHA1_WORKSPACE_WORDS];
3248
3249 static union {
3250 char __data[SHA1_BLOCK_SIZE];
3251 struct {
3252 struct in6_addr secret;
3253 __be32 prefix[2];
3254 unsigned char hwaddr[MAX_ADDR_LEN];
3255 u8 dad_count;
3256 } __packed;
3257 } data;
3258
3259 struct in6_addr secret;
3260 struct in6_addr temp;
3261 struct net *net = dev_net(idev->dev);
3262
3263 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3264
3265 if (idev->cnf.stable_secret.initialized)
3266 secret = idev->cnf.stable_secret.secret;
3267 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3268 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3269 else
3270 return -1;
3271
3272retry:
3273 spin_lock_bh(&lock);
3274
3275 sha1_init(digest);
3276 memset(&data, 0, sizeof(data));
3277 memset(workspace, 0, sizeof(workspace));
3278 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3279 data.prefix[0] = address->s6_addr32[0];
3280 data.prefix[1] = address->s6_addr32[1];
3281 data.secret = secret;
3282 data.dad_count = dad_count;
3283
3284 sha1_transform(digest, data.__data, workspace);
3285
3286 temp = *address;
3287 temp.s6_addr32[2] = (__force __be32)digest[0];
3288 temp.s6_addr32[3] = (__force __be32)digest[1];
3289
3290 spin_unlock_bh(&lock);
3291
3292 if (ipv6_reserved_interfaceid(temp)) {
3293 dad_count++;
3294 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3295 return -1;
3296 goto retry;
3297 }
3298
3299 *address = temp;
3300 return 0;
3301}
3302
3303static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3304{
3305 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3306
3307 if (s->initialized)
3308 return;
3309 s = &idev->cnf.stable_secret;
3310 get_random_bytes(&s->secret, sizeof(s->secret));
3311 s->initialized = true;
3312}
3313
3314static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3315{
3316 struct in6_addr addr;
3317
3318 /* no link local addresses on L3 master devices */
3319 if (netif_is_l3_master(idev->dev))
3320 return;
3321
3322 /* no link local addresses on devices flagged as slaves */
3323 if (idev->dev->priv_flags & IFF_NO_ADDRCONF)
3324 return;
3325
3326 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3327
3328 switch (idev->cnf.addr_gen_mode) {
3329 case IN6_ADDR_GEN_MODE_RANDOM:
3330 ipv6_gen_mode_random_init(idev);
3331 fallthrough;
3332 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3333 if (!ipv6_generate_stable_address(&addr, 0, idev))
3334 addrconf_add_linklocal(idev, &addr,
3335 IFA_F_STABLE_PRIVACY);
3336 else if (prefix_route)
3337 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3338 0, 0, GFP_KERNEL);
3339 break;
3340 case IN6_ADDR_GEN_MODE_EUI64:
3341 /* addrconf_add_linklocal also adds a prefix_route and we
3342 * only need to care about prefix routes if ipv6_generate_eui64
3343 * couldn't generate one.
3344 */
3345 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3346 addrconf_add_linklocal(idev, &addr, 0);
3347 else if (prefix_route)
3348 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3349 0, 0, GFP_KERNEL);
3350 break;
3351 case IN6_ADDR_GEN_MODE_NONE:
3352 default:
3353 /* will not add any link local address */
3354 break;
3355 }
3356}
3357
3358static void addrconf_dev_config(struct net_device *dev)
3359{
3360 struct inet6_dev *idev;
3361
3362 ASSERT_RTNL();
3363
3364 if ((dev->type != ARPHRD_ETHER) &&
3365 (dev->type != ARPHRD_FDDI) &&
3366 (dev->type != ARPHRD_ARCNET) &&
3367 (dev->type != ARPHRD_INFINIBAND) &&
3368 (dev->type != ARPHRD_IEEE1394) &&
3369 (dev->type != ARPHRD_TUNNEL6) &&
3370 (dev->type != ARPHRD_6LOWPAN) &&
3371 (dev->type != ARPHRD_TUNNEL) &&
3372 (dev->type != ARPHRD_NONE) &&
3373 (dev->type != ARPHRD_RAWIP)) {
3374 /* Alas, we support only Ethernet autoconfiguration. */
3375 idev = __in6_dev_get(dev);
3376 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3377 dev->flags & IFF_MULTICAST)
3378 ipv6_mc_up(idev);
3379 return;
3380 }
3381
3382 idev = addrconf_add_dev(dev);
3383 if (IS_ERR(idev))
3384 return;
3385
3386 /* this device type has no EUI support */
3387 if (dev->type == ARPHRD_NONE &&
3388 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3389 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3390
3391 addrconf_addr_gen(idev, false);
3392}
3393
3394#if IS_ENABLED(CONFIG_IPV6_SIT)
3395static void addrconf_sit_config(struct net_device *dev)
3396{
3397 struct inet6_dev *idev;
3398
3399 ASSERT_RTNL();
3400
3401 /*
3402 * Configure the tunnel with one of our IPv4
3403 * addresses... we should configure all of
3404 * our v4 addrs in the tunnel
3405 */
3406
3407 idev = ipv6_find_idev(dev);
3408 if (IS_ERR(idev)) {
3409 pr_debug("%s: add_dev failed\n", __func__);
3410 return;
3411 }
3412
3413 if (dev->priv_flags & IFF_ISATAP) {
3414 addrconf_addr_gen(idev, false);
3415 return;
3416 }
3417
3418 add_v4_addrs(idev);
3419
3420 if (dev->flags&IFF_POINTOPOINT)
3421 addrconf_add_mroute(dev);
3422}
3423#endif
3424
3425#if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3426static void addrconf_gre_config(struct net_device *dev)
3427{
3428 struct inet6_dev *idev;
3429
3430 ASSERT_RTNL();
3431
3432 idev = ipv6_find_idev(dev);
3433 if (IS_ERR(idev)) {
3434 pr_debug("%s: add_dev failed\n", __func__);
3435 return;
3436 }
3437
3438 if (dev->type == ARPHRD_ETHER) {
3439 addrconf_addr_gen(idev, true);
3440 return;
3441 }
3442
3443 add_v4_addrs(idev);
3444
3445 if (dev->flags & IFF_POINTOPOINT)
3446 addrconf_add_mroute(dev);
3447}
3448#endif
3449
3450static void addrconf_init_auto_addrs(struct net_device *dev)
3451{
3452 switch (dev->type) {
3453#if IS_ENABLED(CONFIG_IPV6_SIT)
3454 case ARPHRD_SIT:
3455 addrconf_sit_config(dev);
3456 break;
3457#endif
3458#if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3459 case ARPHRD_IP6GRE:
3460 case ARPHRD_IPGRE:
3461 addrconf_gre_config(dev);
3462 break;
3463#endif
3464 case ARPHRD_LOOPBACK:
3465 init_loopback(dev);
3466 break;
3467
3468 default:
3469 addrconf_dev_config(dev);
3470 break;
3471 }
3472}
3473
3474static int fixup_permanent_addr(struct net *net,
3475 struct inet6_dev *idev,
3476 struct inet6_ifaddr *ifp)
3477{
3478 /* !fib6_node means the host route was removed from the
3479 * FIB, for example, if 'lo' device is taken down. In that
3480 * case regenerate the host route.
3481 */
3482 if (!ifp->rt || !ifp->rt->fib6_node) {
3483 struct fib6_info *f6i, *prev;
3484
3485 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3486 GFP_ATOMIC);
3487 if (IS_ERR(f6i))
3488 return PTR_ERR(f6i);
3489
3490 /* ifp->rt can be accessed outside of rtnl */
3491 spin_lock(&ifp->lock);
3492 prev = ifp->rt;
3493 ifp->rt = f6i;
3494 spin_unlock(&ifp->lock);
3495
3496 fib6_info_release(prev);
3497 }
3498
3499 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3500 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3501 ifp->rt_priority, idev->dev, 0, 0,
3502 GFP_ATOMIC);
3503 }
3504
3505 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3506 addrconf_dad_start(ifp);
3507
3508 return 0;
3509}
3510
3511static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3512{
3513 struct inet6_ifaddr *ifp, *tmp;
3514 struct inet6_dev *idev;
3515
3516 idev = __in6_dev_get(dev);
3517 if (!idev)
3518 return;
3519
3520 write_lock_bh(&idev->lock);
3521
3522 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3523 if ((ifp->flags & IFA_F_PERMANENT) &&
3524 fixup_permanent_addr(net, idev, ifp) < 0) {
3525 write_unlock_bh(&idev->lock);
3526 in6_ifa_hold(ifp);
3527 ipv6_del_addr(ifp);
3528 write_lock_bh(&idev->lock);
3529
3530 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3531 idev->dev->name, &ifp->addr);
3532 }
3533 }
3534
3535 write_unlock_bh(&idev->lock);
3536}
3537
3538static int addrconf_notify(struct notifier_block *this, unsigned long event,
3539 void *ptr)
3540{
3541 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3542 struct netdev_notifier_change_info *change_info;
3543 struct netdev_notifier_changeupper_info *info;
3544 struct inet6_dev *idev = __in6_dev_get(dev);
3545 struct net *net = dev_net(dev);
3546 int run_pending = 0;
3547 int err;
3548
3549 switch (event) {
3550 case NETDEV_REGISTER:
3551 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3552 idev = ipv6_add_dev(dev);
3553 if (IS_ERR(idev))
3554 return notifier_from_errno(PTR_ERR(idev));
3555 }
3556 break;
3557
3558 case NETDEV_CHANGEMTU:
3559 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3560 if (dev->mtu < IPV6_MIN_MTU) {
3561 addrconf_ifdown(dev, dev != net->loopback_dev);
3562 break;
3563 }
3564
3565 if (idev) {
3566 rt6_mtu_change(dev, dev->mtu);
3567 idev->cnf.mtu6 = dev->mtu;
3568 break;
3569 }
3570
3571 /* allocate new idev */
3572 idev = ipv6_add_dev(dev);
3573 if (IS_ERR(idev))
3574 break;
3575
3576 /* device is still not ready */
3577 if (!(idev->if_flags & IF_READY))
3578 break;
3579
3580 run_pending = 1;
3581 fallthrough;
3582 case NETDEV_UP:
3583 case NETDEV_CHANGE:
3584 if (idev && idev->cnf.disable_ipv6)
3585 break;
3586
3587 if (dev->priv_flags & IFF_NO_ADDRCONF) {
3588 if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) &&
3589 dev->flags & IFF_UP && dev->flags & IFF_MULTICAST)
3590 ipv6_mc_up(idev);
3591 break;
3592 }
3593
3594 if (event == NETDEV_UP) {
3595 /* restore routes for permanent addresses */
3596 addrconf_permanent_addr(net, dev);
3597
3598 if (!addrconf_link_ready(dev)) {
3599 /* device is not ready yet. */
3600 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3601 dev->name);
3602 break;
3603 }
3604
3605 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3606 idev = ipv6_add_dev(dev);
3607
3608 if (!IS_ERR_OR_NULL(idev)) {
3609 idev->if_flags |= IF_READY;
3610 run_pending = 1;
3611 }
3612 } else if (event == NETDEV_CHANGE) {
3613 if (!addrconf_link_ready(dev)) {
3614 /* device is still not ready. */
3615 rt6_sync_down_dev(dev, event);
3616 break;
3617 }
3618
3619 if (!IS_ERR_OR_NULL(idev)) {
3620 if (idev->if_flags & IF_READY) {
3621 /* device is already configured -
3622 * but resend MLD reports, we might
3623 * have roamed and need to update
3624 * multicast snooping switches
3625 */
3626 ipv6_mc_up(idev);
3627 change_info = ptr;
3628 if (change_info->flags_changed & IFF_NOARP)
3629 addrconf_dad_run(idev, true);
3630 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3631 break;
3632 }
3633 idev->if_flags |= IF_READY;
3634 }
3635
3636 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3637 dev->name);
3638
3639 run_pending = 1;
3640 }
3641
3642 addrconf_init_auto_addrs(dev);
3643
3644 if (!IS_ERR_OR_NULL(idev)) {
3645 if (run_pending)
3646 addrconf_dad_run(idev, false);
3647
3648 /* Device has an address by now */
3649 rt6_sync_up(dev, RTNH_F_DEAD);
3650
3651 /*
3652 * If the MTU changed during the interface down,
3653 * when the interface up, the changed MTU must be
3654 * reflected in the idev as well as routers.
3655 */
3656 if (idev->cnf.mtu6 != dev->mtu &&
3657 dev->mtu >= IPV6_MIN_MTU) {
3658 rt6_mtu_change(dev, dev->mtu);
3659 idev->cnf.mtu6 = dev->mtu;
3660 }
3661 idev->tstamp = jiffies;
3662 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3663
3664 /*
3665 * If the changed mtu during down is lower than
3666 * IPV6_MIN_MTU stop IPv6 on this interface.
3667 */
3668 if (dev->mtu < IPV6_MIN_MTU)
3669 addrconf_ifdown(dev, dev != net->loopback_dev);
3670 }
3671 break;
3672
3673 case NETDEV_DOWN:
3674 case NETDEV_UNREGISTER:
3675 /*
3676 * Remove all addresses from this interface.
3677 */
3678 addrconf_ifdown(dev, event != NETDEV_DOWN);
3679 break;
3680
3681 case NETDEV_CHANGENAME:
3682 if (idev) {
3683 snmp6_unregister_dev(idev);
3684 addrconf_sysctl_unregister(idev);
3685 err = addrconf_sysctl_register(idev);
3686 if (err)
3687 return notifier_from_errno(err);
3688 err = snmp6_register_dev(idev);
3689 if (err) {
3690 addrconf_sysctl_unregister(idev);
3691 return notifier_from_errno(err);
3692 }
3693 }
3694 break;
3695
3696 case NETDEV_PRE_TYPE_CHANGE:
3697 case NETDEV_POST_TYPE_CHANGE:
3698 if (idev)
3699 addrconf_type_change(dev, event);
3700 break;
3701
3702 case NETDEV_CHANGEUPPER:
3703 info = ptr;
3704
3705 /* flush all routes if dev is linked to or unlinked from
3706 * an L3 master device (e.g., VRF)
3707 */
3708 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3709 addrconf_ifdown(dev, false);
3710 }
3711
3712 return NOTIFY_OK;
3713}
3714
3715/*
3716 * addrconf module should be notified of a device going up
3717 */
3718static struct notifier_block ipv6_dev_notf = {
3719 .notifier_call = addrconf_notify,
3720 .priority = ADDRCONF_NOTIFY_PRIORITY,
3721};
3722
3723static void addrconf_type_change(struct net_device *dev, unsigned long event)
3724{
3725 struct inet6_dev *idev;
3726 ASSERT_RTNL();
3727
3728 idev = __in6_dev_get(dev);
3729
3730 if (event == NETDEV_POST_TYPE_CHANGE)
3731 ipv6_mc_remap(idev);
3732 else if (event == NETDEV_PRE_TYPE_CHANGE)
3733 ipv6_mc_unmap(idev);
3734}
3735
3736static bool addr_is_local(const struct in6_addr *addr)
3737{
3738 return ipv6_addr_type(addr) &
3739 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3740}
3741
3742static int addrconf_ifdown(struct net_device *dev, bool unregister)
3743{
3744 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3745 struct net *net = dev_net(dev);
3746 struct inet6_dev *idev;
3747 struct inet6_ifaddr *ifa;
3748 LIST_HEAD(tmp_addr_list);
3749 bool keep_addr = false;
3750 bool was_ready;
3751 int state, i;
3752
3753 ASSERT_RTNL();
3754
3755 rt6_disable_ip(dev, event);
3756
3757 idev = __in6_dev_get(dev);
3758 if (!idev)
3759 return -ENODEV;
3760
3761 /*
3762 * Step 1: remove reference to ipv6 device from parent device.
3763 * Do not dev_put!
3764 */
3765 if (unregister) {
3766 idev->dead = 1;
3767
3768 /* protected by rtnl_lock */
3769 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3770
3771 /* Step 1.5: remove snmp6 entry */
3772 snmp6_unregister_dev(idev);
3773
3774 }
3775
3776 /* combine the user config with event to determine if permanent
3777 * addresses are to be removed from address hash table
3778 */
3779 if (!unregister && !idev->cnf.disable_ipv6) {
3780 /* aggregate the system setting and interface setting */
3781 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3782
3783 if (!_keep_addr)
3784 _keep_addr = idev->cnf.keep_addr_on_down;
3785
3786 keep_addr = (_keep_addr > 0);
3787 }
3788
3789 /* Step 2: clear hash table */
3790 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3791 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i];
3792
3793 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
3794restart:
3795 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3796 if (ifa->idev == idev) {
3797 addrconf_del_dad_work(ifa);
3798 /* combined flag + permanent flag decide if
3799 * address is retained on a down event
3800 */
3801 if (!keep_addr ||
3802 !(ifa->flags & IFA_F_PERMANENT) ||
3803 addr_is_local(&ifa->addr)) {
3804 hlist_del_init_rcu(&ifa->addr_lst);
3805 goto restart;
3806 }
3807 }
3808 }
3809 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
3810 }
3811
3812 write_lock_bh(&idev->lock);
3813
3814 addrconf_del_rs_timer(idev);
3815
3816 /* Step 2: clear flags for stateless addrconf, repeated down
3817 * detection
3818 */
3819 was_ready = idev->if_flags & IF_READY;
3820 if (!unregister)
3821 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3822
3823 /* Step 3: clear tempaddr list */
3824 while (!list_empty(&idev->tempaddr_list)) {
3825 ifa = list_first_entry(&idev->tempaddr_list,
3826 struct inet6_ifaddr, tmp_list);
3827 list_del(&ifa->tmp_list);
3828 write_unlock_bh(&idev->lock);
3829 spin_lock_bh(&ifa->lock);
3830
3831 if (ifa->ifpub) {
3832 in6_ifa_put(ifa->ifpub);
3833 ifa->ifpub = NULL;
3834 }
3835 spin_unlock_bh(&ifa->lock);
3836 in6_ifa_put(ifa);
3837 write_lock_bh(&idev->lock);
3838 }
3839
3840 list_for_each_entry(ifa, &idev->addr_list, if_list)
3841 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3842 write_unlock_bh(&idev->lock);
3843
3844 while (!list_empty(&tmp_addr_list)) {
3845 struct fib6_info *rt = NULL;
3846 bool keep;
3847
3848 ifa = list_first_entry(&tmp_addr_list,
3849 struct inet6_ifaddr, if_list_aux);
3850 list_del(&ifa->if_list_aux);
3851
3852 addrconf_del_dad_work(ifa);
3853
3854 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3855 !addr_is_local(&ifa->addr);
3856
3857 spin_lock_bh(&ifa->lock);
3858
3859 if (keep) {
3860 /* set state to skip the notifier below */
3861 state = INET6_IFADDR_STATE_DEAD;
3862 ifa->state = INET6_IFADDR_STATE_PREDAD;
3863 if (!(ifa->flags & IFA_F_NODAD))
3864 ifa->flags |= IFA_F_TENTATIVE;
3865
3866 rt = ifa->rt;
3867 ifa->rt = NULL;
3868 } else {
3869 state = ifa->state;
3870 ifa->state = INET6_IFADDR_STATE_DEAD;
3871 }
3872
3873 spin_unlock_bh(&ifa->lock);
3874
3875 if (rt)
3876 ip6_del_rt(net, rt, false);
3877
3878 if (state != INET6_IFADDR_STATE_DEAD) {
3879 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3880 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3881 } else {
3882 if (idev->cnf.forwarding)
3883 addrconf_leave_anycast(ifa);
3884 addrconf_leave_solict(ifa->idev, &ifa->addr);
3885 }
3886
3887 if (!keep) {
3888 write_lock_bh(&idev->lock);
3889 list_del_rcu(&ifa->if_list);
3890 write_unlock_bh(&idev->lock);
3891 in6_ifa_put(ifa);
3892 }
3893 }
3894
3895 /* Step 5: Discard anycast and multicast list */
3896 if (unregister) {
3897 ipv6_ac_destroy_dev(idev);
3898 ipv6_mc_destroy_dev(idev);
3899 } else if (was_ready) {
3900 ipv6_mc_down(idev);
3901 }
3902
3903 idev->tstamp = jiffies;
3904 idev->ra_mtu = 0;
3905
3906 /* Last: Shot the device (if unregistered) */
3907 if (unregister) {
3908 addrconf_sysctl_unregister(idev);
3909 neigh_parms_release(&nd_tbl, idev->nd_parms);
3910 neigh_ifdown(&nd_tbl, dev);
3911 in6_dev_put(idev);
3912 }
3913 return 0;
3914}
3915
3916static void addrconf_rs_timer(struct timer_list *t)
3917{
3918 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3919 struct net_device *dev = idev->dev;
3920 struct in6_addr lladdr;
3921
3922 write_lock(&idev->lock);
3923 if (idev->dead || !(idev->if_flags & IF_READY))
3924 goto out;
3925
3926 if (!ipv6_accept_ra(idev))
3927 goto out;
3928
3929 /* Announcement received after solicitation was sent */
3930 if (idev->if_flags & IF_RA_RCVD)
3931 goto out;
3932
3933 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3934 write_unlock(&idev->lock);
3935 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3936 ndisc_send_rs(dev, &lladdr,
3937 &in6addr_linklocal_allrouters);
3938 else
3939 goto put;
3940
3941 write_lock(&idev->lock);
3942 idev->rs_interval = rfc3315_s14_backoff_update(
3943 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3944 /* The wait after the last probe can be shorter */
3945 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3946 idev->cnf.rtr_solicits) ?
3947 idev->cnf.rtr_solicit_delay :
3948 idev->rs_interval);
3949 } else {
3950 /*
3951 * Note: we do not support deprecated "all on-link"
3952 * assumption any longer.
3953 */
3954 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3955 }
3956
3957out:
3958 write_unlock(&idev->lock);
3959put:
3960 in6_dev_put(idev);
3961}
3962
3963/*
3964 * Duplicate Address Detection
3965 */
3966static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3967{
3968 unsigned long rand_num;
3969 struct inet6_dev *idev = ifp->idev;
3970 u64 nonce;
3971
3972 if (ifp->flags & IFA_F_OPTIMISTIC)
3973 rand_num = 0;
3974 else
3975 rand_num = get_random_u32_below(idev->cnf.rtr_solicit_delay ? : 1);
3976
3977 nonce = 0;
3978 if (idev->cnf.enhanced_dad ||
3979 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3980 do
3981 get_random_bytes(&nonce, 6);
3982 while (nonce == 0);
3983 }
3984 ifp->dad_nonce = nonce;
3985 ifp->dad_probes = idev->cnf.dad_transmits;
3986 addrconf_mod_dad_work(ifp, rand_num);
3987}
3988
3989static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3990{
3991 struct inet6_dev *idev = ifp->idev;
3992 struct net_device *dev = idev->dev;
3993 bool bump_id, notify = false;
3994 struct net *net;
3995
3996 addrconf_join_solict(dev, &ifp->addr);
3997
3998 read_lock_bh(&idev->lock);
3999 spin_lock(&ifp->lock);
4000 if (ifp->state == INET6_IFADDR_STATE_DEAD)
4001 goto out;
4002
4003 net = dev_net(dev);
4004 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
4005 (net->ipv6.devconf_all->accept_dad < 1 &&
4006 idev->cnf.accept_dad < 1) ||
4007 !(ifp->flags&IFA_F_TENTATIVE) ||
4008 ifp->flags & IFA_F_NODAD) {
4009 bool send_na = false;
4010
4011 if (ifp->flags & IFA_F_TENTATIVE &&
4012 !(ifp->flags & IFA_F_OPTIMISTIC))
4013 send_na = true;
4014 bump_id = ifp->flags & IFA_F_TENTATIVE;
4015 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4016 spin_unlock(&ifp->lock);
4017 read_unlock_bh(&idev->lock);
4018
4019 addrconf_dad_completed(ifp, bump_id, send_na);
4020 return;
4021 }
4022
4023 if (!(idev->if_flags & IF_READY)) {
4024 spin_unlock(&ifp->lock);
4025 read_unlock_bh(&idev->lock);
4026 /*
4027 * If the device is not ready:
4028 * - keep it tentative if it is a permanent address.
4029 * - otherwise, kill it.
4030 */
4031 in6_ifa_hold(ifp);
4032 addrconf_dad_stop(ifp, 0);
4033 return;
4034 }
4035
4036 /*
4037 * Optimistic nodes can start receiving
4038 * Frames right away
4039 */
4040 if (ifp->flags & IFA_F_OPTIMISTIC) {
4041 ip6_ins_rt(net, ifp->rt);
4042 if (ipv6_use_optimistic_addr(net, idev)) {
4043 /* Because optimistic nodes can use this address,
4044 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4045 */
4046 notify = true;
4047 }
4048 }
4049
4050 addrconf_dad_kick(ifp);
4051out:
4052 spin_unlock(&ifp->lock);
4053 read_unlock_bh(&idev->lock);
4054 if (notify)
4055 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4056}
4057
4058static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4059{
4060 bool begin_dad = false;
4061
4062 spin_lock_bh(&ifp->lock);
4063 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4064 ifp->state = INET6_IFADDR_STATE_PREDAD;
4065 begin_dad = true;
4066 }
4067 spin_unlock_bh(&ifp->lock);
4068
4069 if (begin_dad)
4070 addrconf_mod_dad_work(ifp, 0);
4071}
4072
4073static void addrconf_dad_work(struct work_struct *w)
4074{
4075 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4076 struct inet6_ifaddr,
4077 dad_work);
4078 struct inet6_dev *idev = ifp->idev;
4079 bool bump_id, disable_ipv6 = false;
4080 struct in6_addr mcaddr;
4081
4082 enum {
4083 DAD_PROCESS,
4084 DAD_BEGIN,
4085 DAD_ABORT,
4086 } action = DAD_PROCESS;
4087
4088 rtnl_lock();
4089
4090 spin_lock_bh(&ifp->lock);
4091 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4092 action = DAD_BEGIN;
4093 ifp->state = INET6_IFADDR_STATE_DAD;
4094 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4095 action = DAD_ABORT;
4096 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4097
4098 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4099 idev->cnf.accept_dad > 1) &&
4100 !idev->cnf.disable_ipv6 &&
4101 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4102 struct in6_addr addr;
4103
4104 addr.s6_addr32[0] = htonl(0xfe800000);
4105 addr.s6_addr32[1] = 0;
4106
4107 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4108 ipv6_addr_equal(&ifp->addr, &addr)) {
4109 /* DAD failed for link-local based on MAC */
4110 idev->cnf.disable_ipv6 = 1;
4111
4112 pr_info("%s: IPv6 being disabled!\n",
4113 ifp->idev->dev->name);
4114 disable_ipv6 = true;
4115 }
4116 }
4117 }
4118 spin_unlock_bh(&ifp->lock);
4119
4120 if (action == DAD_BEGIN) {
4121 addrconf_dad_begin(ifp);
4122 goto out;
4123 } else if (action == DAD_ABORT) {
4124 in6_ifa_hold(ifp);
4125 addrconf_dad_stop(ifp, 1);
4126 if (disable_ipv6)
4127 addrconf_ifdown(idev->dev, false);
4128 goto out;
4129 }
4130
4131 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4132 goto out;
4133
4134 write_lock_bh(&idev->lock);
4135 if (idev->dead || !(idev->if_flags & IF_READY)) {
4136 write_unlock_bh(&idev->lock);
4137 goto out;
4138 }
4139
4140 spin_lock(&ifp->lock);
4141 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4142 spin_unlock(&ifp->lock);
4143 write_unlock_bh(&idev->lock);
4144 goto out;
4145 }
4146
4147 if (ifp->dad_probes == 0) {
4148 bool send_na = false;
4149
4150 /*
4151 * DAD was successful
4152 */
4153
4154 if (ifp->flags & IFA_F_TENTATIVE &&
4155 !(ifp->flags & IFA_F_OPTIMISTIC))
4156 send_na = true;
4157 bump_id = ifp->flags & IFA_F_TENTATIVE;
4158 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4159 spin_unlock(&ifp->lock);
4160 write_unlock_bh(&idev->lock);
4161
4162 addrconf_dad_completed(ifp, bump_id, send_na);
4163
4164 goto out;
4165 }
4166
4167 ifp->dad_probes--;
4168 addrconf_mod_dad_work(ifp,
4169 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4170 HZ/100));
4171 spin_unlock(&ifp->lock);
4172 write_unlock_bh(&idev->lock);
4173
4174 /* send a neighbour solicitation for our addr */
4175 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4176 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4177 ifp->dad_nonce);
4178out:
4179 in6_ifa_put(ifp);
4180 rtnl_unlock();
4181}
4182
4183/* ifp->idev must be at least read locked */
4184static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4185{
4186 struct inet6_ifaddr *ifpiter;
4187 struct inet6_dev *idev = ifp->idev;
4188
4189 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4190 if (ifpiter->scope > IFA_LINK)
4191 break;
4192 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4193 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4194 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4195 IFA_F_PERMANENT)
4196 return false;
4197 }
4198 return true;
4199}
4200
4201static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4202 bool send_na)
4203{
4204 struct net_device *dev = ifp->idev->dev;
4205 struct in6_addr lladdr;
4206 bool send_rs, send_mld;
4207
4208 addrconf_del_dad_work(ifp);
4209
4210 /*
4211 * Configure the address for reception. Now it is valid.
4212 */
4213
4214 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4215
4216 /* If added prefix is link local and we are prepared to process
4217 router advertisements, start sending router solicitations.
4218 */
4219
4220 read_lock_bh(&ifp->idev->lock);
4221 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4222 send_rs = send_mld &&
4223 ipv6_accept_ra(ifp->idev) &&
4224 ifp->idev->cnf.rtr_solicits != 0 &&
4225 (dev->flags & IFF_LOOPBACK) == 0 &&
4226 (dev->type != ARPHRD_TUNNEL);
4227 read_unlock_bh(&ifp->idev->lock);
4228
4229 /* While dad is in progress mld report's source address is in6_addrany.
4230 * Resend with proper ll now.
4231 */
4232 if (send_mld)
4233 ipv6_mc_dad_complete(ifp->idev);
4234
4235 /* send unsolicited NA if enabled */
4236 if (send_na &&
4237 (ifp->idev->cnf.ndisc_notify ||
4238 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4239 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4240 /*router=*/ !!ifp->idev->cnf.forwarding,
4241 /*solicited=*/ false, /*override=*/ true,
4242 /*inc_opt=*/ true);
4243 }
4244
4245 if (send_rs) {
4246 /*
4247 * If a host as already performed a random delay
4248 * [...] as part of DAD [...] there is no need
4249 * to delay again before sending the first RS
4250 */
4251 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4252 return;
4253 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4254
4255 write_lock_bh(&ifp->idev->lock);
4256 spin_lock(&ifp->lock);
4257 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4258 ifp->idev->cnf.rtr_solicit_interval);
4259 ifp->idev->rs_probes = 1;
4260 ifp->idev->if_flags |= IF_RS_SENT;
4261 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4262 spin_unlock(&ifp->lock);
4263 write_unlock_bh(&ifp->idev->lock);
4264 }
4265
4266 if (bump_id)
4267 rt_genid_bump_ipv6(dev_net(dev));
4268
4269 /* Make sure that a new temporary address will be created
4270 * before this temporary address becomes deprecated.
4271 */
4272 if (ifp->flags & IFA_F_TEMPORARY)
4273 addrconf_verify_rtnl(dev_net(dev));
4274}
4275
4276static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4277{
4278 struct inet6_ifaddr *ifp;
4279
4280 read_lock_bh(&idev->lock);
4281 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4282 spin_lock(&ifp->lock);
4283 if ((ifp->flags & IFA_F_TENTATIVE &&
4284 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4285 if (restart)
4286 ifp->state = INET6_IFADDR_STATE_PREDAD;
4287 addrconf_dad_kick(ifp);
4288 }
4289 spin_unlock(&ifp->lock);
4290 }
4291 read_unlock_bh(&idev->lock);
4292}
4293
4294#ifdef CONFIG_PROC_FS
4295struct if6_iter_state {
4296 struct seq_net_private p;
4297 int bucket;
4298 int offset;
4299};
4300
4301static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4302{
4303 struct if6_iter_state *state = seq->private;
4304 struct net *net = seq_file_net(seq);
4305 struct inet6_ifaddr *ifa = NULL;
4306 int p = 0;
4307
4308 /* initial bucket if pos is 0 */
4309 if (pos == 0) {
4310 state->bucket = 0;
4311 state->offset = 0;
4312 }
4313
4314 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4315 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket],
4316 addr_lst) {
4317 /* sync with offset */
4318 if (p < state->offset) {
4319 p++;
4320 continue;
4321 }
4322 return ifa;
4323 }
4324
4325 /* prepare for next bucket */
4326 state->offset = 0;
4327 p = 0;
4328 }
4329 return NULL;
4330}
4331
4332static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4333 struct inet6_ifaddr *ifa)
4334{
4335 struct if6_iter_state *state = seq->private;
4336 struct net *net = seq_file_net(seq);
4337
4338 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4339 state->offset++;
4340 return ifa;
4341 }
4342
4343 state->offset = 0;
4344 while (++state->bucket < IN6_ADDR_HSIZE) {
4345 hlist_for_each_entry_rcu(ifa,
4346 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) {
4347 return ifa;
4348 }
4349 }
4350
4351 return NULL;
4352}
4353
4354static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4355 __acquires(rcu)
4356{
4357 rcu_read_lock();
4358 return if6_get_first(seq, *pos);
4359}
4360
4361static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4362{
4363 struct inet6_ifaddr *ifa;
4364
4365 ifa = if6_get_next(seq, v);
4366 ++*pos;
4367 return ifa;
4368}
4369
4370static void if6_seq_stop(struct seq_file *seq, void *v)
4371 __releases(rcu)
4372{
4373 rcu_read_unlock();
4374}
4375
4376static int if6_seq_show(struct seq_file *seq, void *v)
4377{
4378 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4379 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4380 &ifp->addr,
4381 ifp->idev->dev->ifindex,
4382 ifp->prefix_len,
4383 ifp->scope,
4384 (u8) ifp->flags,
4385 ifp->idev->dev->name);
4386 return 0;
4387}
4388
4389static const struct seq_operations if6_seq_ops = {
4390 .start = if6_seq_start,
4391 .next = if6_seq_next,
4392 .show = if6_seq_show,
4393 .stop = if6_seq_stop,
4394};
4395
4396static int __net_init if6_proc_net_init(struct net *net)
4397{
4398 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4399 sizeof(struct if6_iter_state)))
4400 return -ENOMEM;
4401 return 0;
4402}
4403
4404static void __net_exit if6_proc_net_exit(struct net *net)
4405{
4406 remove_proc_entry("if_inet6", net->proc_net);
4407}
4408
4409static struct pernet_operations if6_proc_net_ops = {
4410 .init = if6_proc_net_init,
4411 .exit = if6_proc_net_exit,
4412};
4413
4414int __init if6_proc_init(void)
4415{
4416 return register_pernet_subsys(&if6_proc_net_ops);
4417}
4418
4419void if6_proc_exit(void)
4420{
4421 unregister_pernet_subsys(&if6_proc_net_ops);
4422}
4423#endif /* CONFIG_PROC_FS */
4424
4425#if IS_ENABLED(CONFIG_IPV6_MIP6)
4426/* Check if address is a home address configured on any interface. */
4427int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4428{
4429 unsigned int hash = inet6_addr_hash(net, addr);
4430 struct inet6_ifaddr *ifp = NULL;
4431 int ret = 0;
4432
4433 rcu_read_lock();
4434 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4435 if (ipv6_addr_equal(&ifp->addr, addr) &&
4436 (ifp->flags & IFA_F_HOMEADDRESS)) {
4437 ret = 1;
4438 break;
4439 }
4440 }
4441 rcu_read_unlock();
4442 return ret;
4443}
4444#endif
4445
4446/* RFC6554 has some algorithm to avoid loops in segment routing by
4447 * checking if the segments contains any of a local interface address.
4448 *
4449 * Quote:
4450 *
4451 * To detect loops in the SRH, a router MUST determine if the SRH
4452 * includes multiple addresses assigned to any interface on that router.
4453 * If such addresses appear more than once and are separated by at least
4454 * one address not assigned to that router.
4455 */
4456int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4457 unsigned char nsegs)
4458{
4459 const struct in6_addr *addr;
4460 int i, ret = 0, found = 0;
4461 struct inet6_ifaddr *ifp;
4462 bool separated = false;
4463 unsigned int hash;
4464 bool hash_found;
4465
4466 rcu_read_lock();
4467 for (i = 0; i < nsegs; i++) {
4468 addr = &segs[i];
4469 hash = inet6_addr_hash(net, addr);
4470
4471 hash_found = false;
4472 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4473
4474 if (ipv6_addr_equal(&ifp->addr, addr)) {
4475 hash_found = true;
4476 break;
4477 }
4478 }
4479
4480 if (hash_found) {
4481 if (found > 1 && separated) {
4482 ret = 1;
4483 break;
4484 }
4485
4486 separated = false;
4487 found++;
4488 } else {
4489 separated = true;
4490 }
4491 }
4492 rcu_read_unlock();
4493
4494 return ret;
4495}
4496
4497/*
4498 * Periodic address status verification
4499 */
4500
4501static void addrconf_verify_rtnl(struct net *net)
4502{
4503 unsigned long now, next, next_sec, next_sched;
4504 struct inet6_ifaddr *ifp;
4505 int i;
4506
4507 ASSERT_RTNL();
4508
4509 rcu_read_lock_bh();
4510 now = jiffies;
4511 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4512
4513 cancel_delayed_work(&net->ipv6.addr_chk_work);
4514
4515 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4516restart:
4517 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) {
4518 unsigned long age;
4519
4520 /* When setting preferred_lft to a value not zero or
4521 * infinity, while valid_lft is infinity
4522 * IFA_F_PERMANENT has a non-infinity life time.
4523 */
4524 if ((ifp->flags & IFA_F_PERMANENT) &&
4525 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4526 continue;
4527
4528 spin_lock(&ifp->lock);
4529 /* We try to batch several events at once. */
4530 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4531
4532 if ((ifp->flags&IFA_F_TEMPORARY) &&
4533 !(ifp->flags&IFA_F_TENTATIVE) &&
4534 ifp->prefered_lft != INFINITY_LIFE_TIME &&
4535 !ifp->regen_count && ifp->ifpub) {
4536 /* This is a non-regenerated temporary addr. */
4537
4538 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4539 ifp->idev->cnf.dad_transmits *
4540 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4541
4542 if (age + regen_advance >= ifp->prefered_lft) {
4543 struct inet6_ifaddr *ifpub = ifp->ifpub;
4544 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4545 next = ifp->tstamp + ifp->prefered_lft * HZ;
4546
4547 ifp->regen_count++;
4548 in6_ifa_hold(ifp);
4549 in6_ifa_hold(ifpub);
4550 spin_unlock(&ifp->lock);
4551
4552 spin_lock(&ifpub->lock);
4553 ifpub->regen_count = 0;
4554 spin_unlock(&ifpub->lock);
4555 rcu_read_unlock_bh();
4556 ipv6_create_tempaddr(ifpub, true);
4557 in6_ifa_put(ifpub);
4558 in6_ifa_put(ifp);
4559 rcu_read_lock_bh();
4560 goto restart;
4561 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4562 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4563 }
4564
4565 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4566 age >= ifp->valid_lft) {
4567 spin_unlock(&ifp->lock);
4568 in6_ifa_hold(ifp);
4569 rcu_read_unlock_bh();
4570 ipv6_del_addr(ifp);
4571 rcu_read_lock_bh();
4572 goto restart;
4573 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4574 spin_unlock(&ifp->lock);
4575 continue;
4576 } else if (age >= ifp->prefered_lft) {
4577 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4578 int deprecate = 0;
4579
4580 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4581 deprecate = 1;
4582 ifp->flags |= IFA_F_DEPRECATED;
4583 }
4584
4585 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4586 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4587 next = ifp->tstamp + ifp->valid_lft * HZ;
4588
4589 spin_unlock(&ifp->lock);
4590
4591 if (deprecate) {
4592 in6_ifa_hold(ifp);
4593
4594 ipv6_ifa_notify(0, ifp);
4595 in6_ifa_put(ifp);
4596 goto restart;
4597 }
4598 } else {
4599 /* ifp->prefered_lft <= ifp->valid_lft */
4600 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4601 next = ifp->tstamp + ifp->prefered_lft * HZ;
4602 spin_unlock(&ifp->lock);
4603 }
4604 }
4605 }
4606
4607 next_sec = round_jiffies_up(next);
4608 next_sched = next;
4609
4610 /* If rounded timeout is accurate enough, accept it. */
4611 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4612 next_sched = next_sec;
4613
4614 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4615 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4616 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4617
4618 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4619 now, next, next_sec, next_sched);
4620 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now);
4621 rcu_read_unlock_bh();
4622}
4623
4624static void addrconf_verify_work(struct work_struct *w)
4625{
4626 struct net *net = container_of(to_delayed_work(w), struct net,
4627 ipv6.addr_chk_work);
4628
4629 rtnl_lock();
4630 addrconf_verify_rtnl(net);
4631 rtnl_unlock();
4632}
4633
4634static void addrconf_verify(struct net *net)
4635{
4636 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0);
4637}
4638
4639static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4640 struct in6_addr **peer_pfx)
4641{
4642 struct in6_addr *pfx = NULL;
4643
4644 *peer_pfx = NULL;
4645
4646 if (addr)
4647 pfx = nla_data(addr);
4648
4649 if (local) {
4650 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4651 *peer_pfx = pfx;
4652 pfx = nla_data(local);
4653 }
4654
4655 return pfx;
4656}
4657
4658static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4659 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4660 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4661 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4662 [IFA_FLAGS] = { .len = sizeof(u32) },
4663 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4664 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4665 [IFA_PROTO] = { .type = NLA_U8 },
4666};
4667
4668static int
4669inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4670 struct netlink_ext_ack *extack)
4671{
4672 struct net *net = sock_net(skb->sk);
4673 struct ifaddrmsg *ifm;
4674 struct nlattr *tb[IFA_MAX+1];
4675 struct in6_addr *pfx, *peer_pfx;
4676 u32 ifa_flags;
4677 int err;
4678
4679 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4680 ifa_ipv6_policy, extack);
4681 if (err < 0)
4682 return err;
4683
4684 ifm = nlmsg_data(nlh);
4685 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4686 if (!pfx)
4687 return -EINVAL;
4688
4689 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4690
4691 /* We ignore other flags so far. */
4692 ifa_flags &= IFA_F_MANAGETEMPADDR;
4693
4694 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4695 ifm->ifa_prefixlen);
4696}
4697
4698static int modify_prefix_route(struct inet6_ifaddr *ifp,
4699 unsigned long expires, u32 flags,
4700 bool modify_peer)
4701{
4702 struct fib6_info *f6i;
4703 u32 prio;
4704
4705 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4706 ifp->prefix_len,
4707 ifp->idev->dev, 0, RTF_DEFAULT, true);
4708 if (!f6i)
4709 return -ENOENT;
4710
4711 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4712 if (f6i->fib6_metric != prio) {
4713 /* delete old one */
4714 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4715
4716 /* add new one */
4717 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4718 ifp->prefix_len,
4719 ifp->rt_priority, ifp->idev->dev,
4720 expires, flags, GFP_KERNEL);
4721 } else {
4722 if (!expires)
4723 fib6_clean_expires(f6i);
4724 else
4725 fib6_set_expires(f6i, expires);
4726
4727 fib6_info_release(f6i);
4728 }
4729
4730 return 0;
4731}
4732
4733static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp,
4734 struct ifa6_config *cfg)
4735{
4736 u32 flags;
4737 clock_t expires;
4738 unsigned long timeout;
4739 bool was_managetempaddr;
4740 bool had_prefixroute;
4741 bool new_peer = false;
4742
4743 ASSERT_RTNL();
4744
4745 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4746 return -EINVAL;
4747
4748 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4749 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4750 return -EINVAL;
4751
4752 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4753 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4754
4755 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4756 if (addrconf_finite_timeout(timeout)) {
4757 expires = jiffies_to_clock_t(timeout * HZ);
4758 cfg->valid_lft = timeout;
4759 flags = RTF_EXPIRES;
4760 } else {
4761 expires = 0;
4762 flags = 0;
4763 cfg->ifa_flags |= IFA_F_PERMANENT;
4764 }
4765
4766 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4767 if (addrconf_finite_timeout(timeout)) {
4768 if (timeout == 0)
4769 cfg->ifa_flags |= IFA_F_DEPRECATED;
4770 cfg->preferred_lft = timeout;
4771 }
4772
4773 if (cfg->peer_pfx &&
4774 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4775 if (!ipv6_addr_any(&ifp->peer_addr))
4776 cleanup_prefix_route(ifp, expires, true, true);
4777 new_peer = true;
4778 }
4779
4780 spin_lock_bh(&ifp->lock);
4781 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4782 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4783 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4784 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4785 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4786 IFA_F_NOPREFIXROUTE);
4787 ifp->flags |= cfg->ifa_flags;
4788 ifp->tstamp = jiffies;
4789 ifp->valid_lft = cfg->valid_lft;
4790 ifp->prefered_lft = cfg->preferred_lft;
4791 ifp->ifa_proto = cfg->ifa_proto;
4792
4793 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4794 ifp->rt_priority = cfg->rt_priority;
4795
4796 if (new_peer)
4797 ifp->peer_addr = *cfg->peer_pfx;
4798
4799 spin_unlock_bh(&ifp->lock);
4800 if (!(ifp->flags&IFA_F_TENTATIVE))
4801 ipv6_ifa_notify(0, ifp);
4802
4803 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4804 int rc = -ENOENT;
4805
4806 if (had_prefixroute)
4807 rc = modify_prefix_route(ifp, expires, flags, false);
4808
4809 /* prefix route could have been deleted; if so restore it */
4810 if (rc == -ENOENT) {
4811 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4812 ifp->rt_priority, ifp->idev->dev,
4813 expires, flags, GFP_KERNEL);
4814 }
4815
4816 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4817 rc = modify_prefix_route(ifp, expires, flags, true);
4818
4819 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4820 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4821 ifp->rt_priority, ifp->idev->dev,
4822 expires, flags, GFP_KERNEL);
4823 }
4824 } else if (had_prefixroute) {
4825 enum cleanup_prefix_rt_t action;
4826 unsigned long rt_expires;
4827
4828 write_lock_bh(&ifp->idev->lock);
4829 action = check_cleanup_prefix_route(ifp, &rt_expires);
4830 write_unlock_bh(&ifp->idev->lock);
4831
4832 if (action != CLEANUP_PREFIX_RT_NOP) {
4833 cleanup_prefix_route(ifp, rt_expires,
4834 action == CLEANUP_PREFIX_RT_DEL, false);
4835 }
4836 }
4837
4838 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4839 if (was_managetempaddr &&
4840 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4841 cfg->valid_lft = 0;
4842 cfg->preferred_lft = 0;
4843 }
4844 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4845 cfg->preferred_lft, !was_managetempaddr,
4846 jiffies);
4847 }
4848
4849 addrconf_verify_rtnl(net);
4850
4851 return 0;
4852}
4853
4854static int
4855inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4856 struct netlink_ext_ack *extack)
4857{
4858 struct net *net = sock_net(skb->sk);
4859 struct ifaddrmsg *ifm;
4860 struct nlattr *tb[IFA_MAX+1];
4861 struct in6_addr *peer_pfx;
4862 struct inet6_ifaddr *ifa;
4863 struct net_device *dev;
4864 struct inet6_dev *idev;
4865 struct ifa6_config cfg;
4866 int err;
4867
4868 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4869 ifa_ipv6_policy, extack);
4870 if (err < 0)
4871 return err;
4872
4873 memset(&cfg, 0, sizeof(cfg));
4874
4875 ifm = nlmsg_data(nlh);
4876 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4877 if (!cfg.pfx)
4878 return -EINVAL;
4879
4880 cfg.peer_pfx = peer_pfx;
4881 cfg.plen = ifm->ifa_prefixlen;
4882 if (tb[IFA_RT_PRIORITY])
4883 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4884
4885 if (tb[IFA_PROTO])
4886 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]);
4887
4888 cfg.valid_lft = INFINITY_LIFE_TIME;
4889 cfg.preferred_lft = INFINITY_LIFE_TIME;
4890
4891 if (tb[IFA_CACHEINFO]) {
4892 struct ifa_cacheinfo *ci;
4893
4894 ci = nla_data(tb[IFA_CACHEINFO]);
4895 cfg.valid_lft = ci->ifa_valid;
4896 cfg.preferred_lft = ci->ifa_prefered;
4897 }
4898
4899 dev = __dev_get_by_index(net, ifm->ifa_index);
4900 if (!dev)
4901 return -ENODEV;
4902
4903 if (tb[IFA_FLAGS])
4904 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4905 else
4906 cfg.ifa_flags = ifm->ifa_flags;
4907
4908 /* We ignore other flags so far. */
4909 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4910 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4911 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4912
4913 idev = ipv6_find_idev(dev);
4914 if (IS_ERR(idev))
4915 return PTR_ERR(idev);
4916
4917 if (!ipv6_allow_optimistic_dad(net, idev))
4918 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4919
4920 if (cfg.ifa_flags & IFA_F_NODAD &&
4921 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4922 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4923 return -EINVAL;
4924 }
4925
4926 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4927 if (!ifa) {
4928 /*
4929 * It would be best to check for !NLM_F_CREATE here but
4930 * userspace already relies on not having to provide this.
4931 */
4932 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4933 }
4934
4935 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4936 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4937 err = -EEXIST;
4938 else
4939 err = inet6_addr_modify(net, ifa, &cfg);
4940
4941 in6_ifa_put(ifa);
4942
4943 return err;
4944}
4945
4946static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4947 u8 scope, int ifindex)
4948{
4949 struct ifaddrmsg *ifm;
4950
4951 ifm = nlmsg_data(nlh);
4952 ifm->ifa_family = AF_INET6;
4953 ifm->ifa_prefixlen = prefixlen;
4954 ifm->ifa_flags = flags;
4955 ifm->ifa_scope = scope;
4956 ifm->ifa_index = ifindex;
4957}
4958
4959static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4960 unsigned long tstamp, u32 preferred, u32 valid)
4961{
4962 struct ifa_cacheinfo ci;
4963
4964 ci.cstamp = cstamp_delta(cstamp);
4965 ci.tstamp = cstamp_delta(tstamp);
4966 ci.ifa_prefered = preferred;
4967 ci.ifa_valid = valid;
4968
4969 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4970}
4971
4972static inline int rt_scope(int ifa_scope)
4973{
4974 if (ifa_scope & IFA_HOST)
4975 return RT_SCOPE_HOST;
4976 else if (ifa_scope & IFA_LINK)
4977 return RT_SCOPE_LINK;
4978 else if (ifa_scope & IFA_SITE)
4979 return RT_SCOPE_SITE;
4980 else
4981 return RT_SCOPE_UNIVERSE;
4982}
4983
4984static inline int inet6_ifaddr_msgsize(void)
4985{
4986 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4987 + nla_total_size(16) /* IFA_LOCAL */
4988 + nla_total_size(16) /* IFA_ADDRESS */
4989 + nla_total_size(sizeof(struct ifa_cacheinfo))
4990 + nla_total_size(4) /* IFA_FLAGS */
4991 + nla_total_size(1) /* IFA_PROTO */
4992 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4993}
4994
4995enum addr_type_t {
4996 UNICAST_ADDR,
4997 MULTICAST_ADDR,
4998 ANYCAST_ADDR,
4999};
5000
5001struct inet6_fill_args {
5002 u32 portid;
5003 u32 seq;
5004 int event;
5005 unsigned int flags;
5006 int netnsid;
5007 int ifindex;
5008 enum addr_type_t type;
5009};
5010
5011static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
5012 struct inet6_fill_args *args)
5013{
5014 struct nlmsghdr *nlh;
5015 u32 preferred, valid;
5016
5017 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5018 sizeof(struct ifaddrmsg), args->flags);
5019 if (!nlh)
5020 return -EMSGSIZE;
5021
5022 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
5023 ifa->idev->dev->ifindex);
5024
5025 if (args->netnsid >= 0 &&
5026 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5027 goto error;
5028
5029 spin_lock_bh(&ifa->lock);
5030 if (!((ifa->flags&IFA_F_PERMANENT) &&
5031 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
5032 preferred = ifa->prefered_lft;
5033 valid = ifa->valid_lft;
5034 if (preferred != INFINITY_LIFE_TIME) {
5035 long tval = (jiffies - ifa->tstamp)/HZ;
5036 if (preferred > tval)
5037 preferred -= tval;
5038 else
5039 preferred = 0;
5040 if (valid != INFINITY_LIFE_TIME) {
5041 if (valid > tval)
5042 valid -= tval;
5043 else
5044 valid = 0;
5045 }
5046 }
5047 } else {
5048 preferred = INFINITY_LIFE_TIME;
5049 valid = INFINITY_LIFE_TIME;
5050 }
5051 spin_unlock_bh(&ifa->lock);
5052
5053 if (!ipv6_addr_any(&ifa->peer_addr)) {
5054 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5055 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5056 goto error;
5057 } else
5058 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5059 goto error;
5060
5061 if (ifa->rt_priority &&
5062 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
5063 goto error;
5064
5065 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5066 goto error;
5067
5068 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5069 goto error;
5070
5071 if (ifa->ifa_proto &&
5072 nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto))
5073 goto error;
5074
5075 nlmsg_end(skb, nlh);
5076 return 0;
5077
5078error:
5079 nlmsg_cancel(skb, nlh);
5080 return -EMSGSIZE;
5081}
5082
5083static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
5084 struct inet6_fill_args *args)
5085{
5086 struct nlmsghdr *nlh;
5087 u8 scope = RT_SCOPE_UNIVERSE;
5088 int ifindex = ifmca->idev->dev->ifindex;
5089
5090 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5091 scope = RT_SCOPE_SITE;
5092
5093 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5094 sizeof(struct ifaddrmsg), args->flags);
5095 if (!nlh)
5096 return -EMSGSIZE;
5097
5098 if (args->netnsid >= 0 &&
5099 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5100 nlmsg_cancel(skb, nlh);
5101 return -EMSGSIZE;
5102 }
5103
5104 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5105 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5106 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5107 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5108 nlmsg_cancel(skb, nlh);
5109 return -EMSGSIZE;
5110 }
5111
5112 nlmsg_end(skb, nlh);
5113 return 0;
5114}
5115
5116static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5117 struct inet6_fill_args *args)
5118{
5119 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5120 int ifindex = dev ? dev->ifindex : 1;
5121 struct nlmsghdr *nlh;
5122 u8 scope = RT_SCOPE_UNIVERSE;
5123
5124 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5125 scope = RT_SCOPE_SITE;
5126
5127 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5128 sizeof(struct ifaddrmsg), args->flags);
5129 if (!nlh)
5130 return -EMSGSIZE;
5131
5132 if (args->netnsid >= 0 &&
5133 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5134 nlmsg_cancel(skb, nlh);
5135 return -EMSGSIZE;
5136 }
5137
5138 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5139 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5140 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5141 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5142 nlmsg_cancel(skb, nlh);
5143 return -EMSGSIZE;
5144 }
5145
5146 nlmsg_end(skb, nlh);
5147 return 0;
5148}
5149
5150/* called with rcu_read_lock() */
5151static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5152 struct netlink_callback *cb, int s_ip_idx,
5153 struct inet6_fill_args *fillargs)
5154{
5155 struct ifmcaddr6 *ifmca;
5156 struct ifacaddr6 *ifaca;
5157 int ip_idx = 0;
5158 int err = 1;
5159
5160 read_lock_bh(&idev->lock);
5161 switch (fillargs->type) {
5162 case UNICAST_ADDR: {
5163 struct inet6_ifaddr *ifa;
5164 fillargs->event = RTM_NEWADDR;
5165
5166 /* unicast address incl. temp addr */
5167 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5168 if (ip_idx < s_ip_idx)
5169 goto next;
5170 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5171 if (err < 0)
5172 break;
5173 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5174next:
5175 ip_idx++;
5176 }
5177 break;
5178 }
5179 case MULTICAST_ADDR:
5180 read_unlock_bh(&idev->lock);
5181 fillargs->event = RTM_GETMULTICAST;
5182
5183 /* multicast address */
5184 for (ifmca = rtnl_dereference(idev->mc_list);
5185 ifmca;
5186 ifmca = rtnl_dereference(ifmca->next), ip_idx++) {
5187 if (ip_idx < s_ip_idx)
5188 continue;
5189 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5190 if (err < 0)
5191 break;
5192 }
5193 read_lock_bh(&idev->lock);
5194 break;
5195 case ANYCAST_ADDR:
5196 fillargs->event = RTM_GETANYCAST;
5197 /* anycast address */
5198 for (ifaca = idev->ac_list; ifaca;
5199 ifaca = ifaca->aca_next, ip_idx++) {
5200 if (ip_idx < s_ip_idx)
5201 continue;
5202 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5203 if (err < 0)
5204 break;
5205 }
5206 break;
5207 default:
5208 break;
5209 }
5210 read_unlock_bh(&idev->lock);
5211 cb->args[2] = ip_idx;
5212 return err;
5213}
5214
5215static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5216 struct inet6_fill_args *fillargs,
5217 struct net **tgt_net, struct sock *sk,
5218 struct netlink_callback *cb)
5219{
5220 struct netlink_ext_ack *extack = cb->extack;
5221 struct nlattr *tb[IFA_MAX+1];
5222 struct ifaddrmsg *ifm;
5223 int err, i;
5224
5225 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5226 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5227 return -EINVAL;
5228 }
5229
5230 ifm = nlmsg_data(nlh);
5231 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5232 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5233 return -EINVAL;
5234 }
5235
5236 fillargs->ifindex = ifm->ifa_index;
5237 if (fillargs->ifindex) {
5238 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5239 fillargs->flags |= NLM_F_DUMP_FILTERED;
5240 }
5241
5242 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5243 ifa_ipv6_policy, extack);
5244 if (err < 0)
5245 return err;
5246
5247 for (i = 0; i <= IFA_MAX; ++i) {
5248 if (!tb[i])
5249 continue;
5250
5251 if (i == IFA_TARGET_NETNSID) {
5252 struct net *net;
5253
5254 fillargs->netnsid = nla_get_s32(tb[i]);
5255 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5256 if (IS_ERR(net)) {
5257 fillargs->netnsid = -1;
5258 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5259 return PTR_ERR(net);
5260 }
5261 *tgt_net = net;
5262 } else {
5263 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5264 return -EINVAL;
5265 }
5266 }
5267
5268 return 0;
5269}
5270
5271static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5272 enum addr_type_t type)
5273{
5274 const struct nlmsghdr *nlh = cb->nlh;
5275 struct inet6_fill_args fillargs = {
5276 .portid = NETLINK_CB(cb->skb).portid,
5277 .seq = cb->nlh->nlmsg_seq,
5278 .flags = NLM_F_MULTI,
5279 .netnsid = -1,
5280 .type = type,
5281 };
5282 struct net *tgt_net = sock_net(skb->sk);
5283 int idx, s_idx, s_ip_idx;
5284 int h, s_h;
5285 struct net_device *dev;
5286 struct inet6_dev *idev;
5287 struct hlist_head *head;
5288 int err = 0;
5289
5290 s_h = cb->args[0];
5291 s_idx = idx = cb->args[1];
5292 s_ip_idx = cb->args[2];
5293
5294 if (cb->strict_check) {
5295 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5296 skb->sk, cb);
5297 if (err < 0)
5298 goto put_tgt_net;
5299
5300 err = 0;
5301 if (fillargs.ifindex) {
5302 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5303 if (!dev) {
5304 err = -ENODEV;
5305 goto put_tgt_net;
5306 }
5307 idev = __in6_dev_get(dev);
5308 if (idev) {
5309 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5310 &fillargs);
5311 if (err > 0)
5312 err = 0;
5313 }
5314 goto put_tgt_net;
5315 }
5316 }
5317
5318 rcu_read_lock();
5319 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5320 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5321 idx = 0;
5322 head = &tgt_net->dev_index_head[h];
5323 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5324 if (idx < s_idx)
5325 goto cont;
5326 if (h > s_h || idx > s_idx)
5327 s_ip_idx = 0;
5328 idev = __in6_dev_get(dev);
5329 if (!idev)
5330 goto cont;
5331
5332 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5333 &fillargs) < 0)
5334 goto done;
5335cont:
5336 idx++;
5337 }
5338 }
5339done:
5340 rcu_read_unlock();
5341 cb->args[0] = h;
5342 cb->args[1] = idx;
5343put_tgt_net:
5344 if (fillargs.netnsid >= 0)
5345 put_net(tgt_net);
5346
5347 return skb->len ? : err;
5348}
5349
5350static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5351{
5352 enum addr_type_t type = UNICAST_ADDR;
5353
5354 return inet6_dump_addr(skb, cb, type);
5355}
5356
5357static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5358{
5359 enum addr_type_t type = MULTICAST_ADDR;
5360
5361 return inet6_dump_addr(skb, cb, type);
5362}
5363
5364
5365static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5366{
5367 enum addr_type_t type = ANYCAST_ADDR;
5368
5369 return inet6_dump_addr(skb, cb, type);
5370}
5371
5372static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5373 const struct nlmsghdr *nlh,
5374 struct nlattr **tb,
5375 struct netlink_ext_ack *extack)
5376{
5377 struct ifaddrmsg *ifm;
5378 int i, err;
5379
5380 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5381 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5382 return -EINVAL;
5383 }
5384
5385 if (!netlink_strict_get_check(skb))
5386 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5387 ifa_ipv6_policy, extack);
5388
5389 ifm = nlmsg_data(nlh);
5390 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5391 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5392 return -EINVAL;
5393 }
5394
5395 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5396 ifa_ipv6_policy, extack);
5397 if (err)
5398 return err;
5399
5400 for (i = 0; i <= IFA_MAX; i++) {
5401 if (!tb[i])
5402 continue;
5403
5404 switch (i) {
5405 case IFA_TARGET_NETNSID:
5406 case IFA_ADDRESS:
5407 case IFA_LOCAL:
5408 break;
5409 default:
5410 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5411 return -EINVAL;
5412 }
5413 }
5414
5415 return 0;
5416}
5417
5418static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5419 struct netlink_ext_ack *extack)
5420{
5421 struct net *tgt_net = sock_net(in_skb->sk);
5422 struct inet6_fill_args fillargs = {
5423 .portid = NETLINK_CB(in_skb).portid,
5424 .seq = nlh->nlmsg_seq,
5425 .event = RTM_NEWADDR,
5426 .flags = 0,
5427 .netnsid = -1,
5428 };
5429 struct ifaddrmsg *ifm;
5430 struct nlattr *tb[IFA_MAX+1];
5431 struct in6_addr *addr = NULL, *peer;
5432 struct net_device *dev = NULL;
5433 struct inet6_ifaddr *ifa;
5434 struct sk_buff *skb;
5435 int err;
5436
5437 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5438 if (err < 0)
5439 return err;
5440
5441 if (tb[IFA_TARGET_NETNSID]) {
5442 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5443
5444 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5445 fillargs.netnsid);
5446 if (IS_ERR(tgt_net))
5447 return PTR_ERR(tgt_net);
5448 }
5449
5450 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5451 if (!addr)
5452 return -EINVAL;
5453
5454 ifm = nlmsg_data(nlh);
5455 if (ifm->ifa_index)
5456 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5457
5458 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5459 if (!ifa) {
5460 err = -EADDRNOTAVAIL;
5461 goto errout;
5462 }
5463
5464 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5465 if (!skb) {
5466 err = -ENOBUFS;
5467 goto errout_ifa;
5468 }
5469
5470 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5471 if (err < 0) {
5472 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5473 WARN_ON(err == -EMSGSIZE);
5474 kfree_skb(skb);
5475 goto errout_ifa;
5476 }
5477 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5478errout_ifa:
5479 in6_ifa_put(ifa);
5480errout:
5481 dev_put(dev);
5482 if (fillargs.netnsid >= 0)
5483 put_net(tgt_net);
5484
5485 return err;
5486}
5487
5488static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5489{
5490 struct sk_buff *skb;
5491 struct net *net = dev_net(ifa->idev->dev);
5492 struct inet6_fill_args fillargs = {
5493 .portid = 0,
5494 .seq = 0,
5495 .event = event,
5496 .flags = 0,
5497 .netnsid = -1,
5498 };
5499 int err = -ENOBUFS;
5500
5501 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5502 if (!skb)
5503 goto errout;
5504
5505 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5506 if (err < 0) {
5507 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5508 WARN_ON(err == -EMSGSIZE);
5509 kfree_skb(skb);
5510 goto errout;
5511 }
5512 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5513 return;
5514errout:
5515 if (err < 0)
5516 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5517}
5518
5519static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5520 __s32 *array, int bytes)
5521{
5522 BUG_ON(bytes < (DEVCONF_MAX * 4));
5523
5524 memset(array, 0, bytes);
5525 array[DEVCONF_FORWARDING] = cnf->forwarding;
5526 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5527 array[DEVCONF_MTU6] = cnf->mtu6;
5528 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5529 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5530 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5531 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5532 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5533 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5534 jiffies_to_msecs(cnf->rtr_solicit_interval);
5535 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5536 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5537 array[DEVCONF_RTR_SOLICIT_DELAY] =
5538 jiffies_to_msecs(cnf->rtr_solicit_delay);
5539 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5540 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5541 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5542 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5543 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5544 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5545 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5546 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5547 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5548 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5549 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5550 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5551 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric;
5552 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5553 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5554#ifdef CONFIG_IPV6_ROUTER_PREF
5555 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5556 array[DEVCONF_RTR_PROBE_INTERVAL] =
5557 jiffies_to_msecs(cnf->rtr_probe_interval);
5558#ifdef CONFIG_IPV6_ROUTE_INFO
5559 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5560 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5561#endif
5562#endif
5563 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5564 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5565#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5566 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5567 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5568#endif
5569#ifdef CONFIG_IPV6_MROUTE
5570 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5571#endif
5572 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5573 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5574 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5575 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5576 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5577 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5578 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5579 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5580 /* we omit DEVCONF_STABLE_SECRET for now */
5581 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5582 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5583 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5584 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5585 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5586#ifdef CONFIG_IPV6_SEG6_HMAC
5587 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5588#endif
5589 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5590 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5591 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5592 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5593 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
5594 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled;
5595 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id;
5596 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide;
5597 array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier;
5598 array[DEVCONF_ACCEPT_UNTRACKED_NA] = cnf->accept_untracked_na;
5599}
5600
5601static inline size_t inet6_ifla6_size(void)
5602{
5603 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5604 + nla_total_size(sizeof(struct ifla_cacheinfo))
5605 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5606 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5607 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5608 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5609 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5610 + nla_total_size(4) /* IFLA_INET6_RA_MTU */
5611 + 0;
5612}
5613
5614static inline size_t inet6_if_nlmsg_size(void)
5615{
5616 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5617 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5618 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5619 + nla_total_size(4) /* IFLA_MTU */
5620 + nla_total_size(4) /* IFLA_LINK */
5621 + nla_total_size(1) /* IFLA_OPERSTATE */
5622 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5623}
5624
5625static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5626 int bytes)
5627{
5628 int i;
5629 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5630 BUG_ON(pad < 0);
5631
5632 /* Use put_unaligned() because stats may not be aligned for u64. */
5633 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5634 for (i = 1; i < ICMP6_MIB_MAX; i++)
5635 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5636
5637 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5638}
5639
5640static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5641 int bytes, size_t syncpoff)
5642{
5643 int i, c;
5644 u64 buff[IPSTATS_MIB_MAX];
5645 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5646
5647 BUG_ON(pad < 0);
5648
5649 memset(buff, 0, sizeof(buff));
5650 buff[0] = IPSTATS_MIB_MAX;
5651
5652 for_each_possible_cpu(c) {
5653 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5654 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5655 }
5656
5657 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5658 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5659}
5660
5661static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5662 int bytes)
5663{
5664 switch (attrtype) {
5665 case IFLA_INET6_STATS:
5666 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5667 offsetof(struct ipstats_mib, syncp));
5668 break;
5669 case IFLA_INET6_ICMP6STATS:
5670 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5671 break;
5672 }
5673}
5674
5675static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5676 u32 ext_filter_mask)
5677{
5678 struct nlattr *nla;
5679 struct ifla_cacheinfo ci;
5680
5681 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5682 goto nla_put_failure;
5683 ci.max_reasm_len = IPV6_MAXPLEN;
5684 ci.tstamp = cstamp_delta(idev->tstamp);
5685 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5686 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5687 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5688 goto nla_put_failure;
5689 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5690 if (!nla)
5691 goto nla_put_failure;
5692 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5693
5694 /* XXX - MC not implemented */
5695
5696 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5697 return 0;
5698
5699 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5700 if (!nla)
5701 goto nla_put_failure;
5702 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5703
5704 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5705 if (!nla)
5706 goto nla_put_failure;
5707 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5708
5709 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5710 if (!nla)
5711 goto nla_put_failure;
5712 read_lock_bh(&idev->lock);
5713 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5714 read_unlock_bh(&idev->lock);
5715
5716 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5717 goto nla_put_failure;
5718
5719 if (idev->ra_mtu &&
5720 nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu))
5721 goto nla_put_failure;
5722
5723 return 0;
5724
5725nla_put_failure:
5726 return -EMSGSIZE;
5727}
5728
5729static size_t inet6_get_link_af_size(const struct net_device *dev,
5730 u32 ext_filter_mask)
5731{
5732 if (!__in6_dev_get(dev))
5733 return 0;
5734
5735 return inet6_ifla6_size();
5736}
5737
5738static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5739 u32 ext_filter_mask)
5740{
5741 struct inet6_dev *idev = __in6_dev_get(dev);
5742
5743 if (!idev)
5744 return -ENODATA;
5745
5746 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5747 return -EMSGSIZE;
5748
5749 return 0;
5750}
5751
5752static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5753 struct netlink_ext_ack *extack)
5754{
5755 struct inet6_ifaddr *ifp;
5756 struct net_device *dev = idev->dev;
5757 bool clear_token, update_rs = false;
5758 struct in6_addr ll_addr;
5759
5760 ASSERT_RTNL();
5761
5762 if (!token)
5763 return -EINVAL;
5764
5765 if (dev->flags & IFF_LOOPBACK) {
5766 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
5767 return -EINVAL;
5768 }
5769
5770 if (dev->flags & IFF_NOARP) {
5771 NL_SET_ERR_MSG_MOD(extack,
5772 "Device does not do neighbour discovery");
5773 return -EINVAL;
5774 }
5775
5776 if (!ipv6_accept_ra(idev)) {
5777 NL_SET_ERR_MSG_MOD(extack,
5778 "Router advertisement is disabled on device");
5779 return -EINVAL;
5780 }
5781
5782 if (idev->cnf.rtr_solicits == 0) {
5783 NL_SET_ERR_MSG(extack,
5784 "Router solicitation is disabled on device");
5785 return -EINVAL;
5786 }
5787
5788 write_lock_bh(&idev->lock);
5789
5790 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5791 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5792
5793 write_unlock_bh(&idev->lock);
5794
5795 clear_token = ipv6_addr_any(token);
5796 if (clear_token)
5797 goto update_lft;
5798
5799 if (!idev->dead && (idev->if_flags & IF_READY) &&
5800 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5801 IFA_F_OPTIMISTIC)) {
5802 /* If we're not ready, then normal ifup will take care
5803 * of this. Otherwise, we need to request our rs here.
5804 */
5805 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5806 update_rs = true;
5807 }
5808
5809update_lft:
5810 write_lock_bh(&idev->lock);
5811
5812 if (update_rs) {
5813 idev->if_flags |= IF_RS_SENT;
5814 idev->rs_interval = rfc3315_s14_backoff_init(
5815 idev->cnf.rtr_solicit_interval);
5816 idev->rs_probes = 1;
5817 addrconf_mod_rs_timer(idev, idev->rs_interval);
5818 }
5819
5820 /* Well, that's kinda nasty ... */
5821 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5822 spin_lock(&ifp->lock);
5823 if (ifp->tokenized) {
5824 ifp->valid_lft = 0;
5825 ifp->prefered_lft = 0;
5826 }
5827 spin_unlock(&ifp->lock);
5828 }
5829
5830 write_unlock_bh(&idev->lock);
5831 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5832 addrconf_verify_rtnl(dev_net(dev));
5833 return 0;
5834}
5835
5836static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5837 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5838 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5839 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT,
5840 .reject_message =
5841 "IFLA_INET6_RA_MTU can not be set" },
5842};
5843
5844static int check_addr_gen_mode(int mode)
5845{
5846 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5847 mode != IN6_ADDR_GEN_MODE_NONE &&
5848 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5849 mode != IN6_ADDR_GEN_MODE_RANDOM)
5850 return -EINVAL;
5851 return 1;
5852}
5853
5854static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5855 int mode)
5856{
5857 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5858 !idev->cnf.stable_secret.initialized &&
5859 !net->ipv6.devconf_dflt->stable_secret.initialized)
5860 return -EINVAL;
5861 return 1;
5862}
5863
5864static int inet6_validate_link_af(const struct net_device *dev,
5865 const struct nlattr *nla,
5866 struct netlink_ext_ack *extack)
5867{
5868 struct nlattr *tb[IFLA_INET6_MAX + 1];
5869 struct inet6_dev *idev = NULL;
5870 int err;
5871
5872 if (dev) {
5873 idev = __in6_dev_get(dev);
5874 if (!idev)
5875 return -EAFNOSUPPORT;
5876 }
5877
5878 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5879 inet6_af_policy, extack);
5880 if (err)
5881 return err;
5882
5883 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5884 return -EINVAL;
5885
5886 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5887 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5888
5889 if (check_addr_gen_mode(mode) < 0)
5890 return -EINVAL;
5891 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5892 return -EINVAL;
5893 }
5894
5895 return 0;
5896}
5897
5898static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
5899 struct netlink_ext_ack *extack)
5900{
5901 struct inet6_dev *idev = __in6_dev_get(dev);
5902 struct nlattr *tb[IFLA_INET6_MAX + 1];
5903 int err;
5904
5905 if (!idev)
5906 return -EAFNOSUPPORT;
5907
5908 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5909 return -EINVAL;
5910
5911 if (tb[IFLA_INET6_TOKEN]) {
5912 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
5913 extack);
5914 if (err)
5915 return err;
5916 }
5917
5918 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5919 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5920
5921 idev->cnf.addr_gen_mode = mode;
5922 }
5923
5924 return 0;
5925}
5926
5927static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5928 u32 portid, u32 seq, int event, unsigned int flags)
5929{
5930 struct net_device *dev = idev->dev;
5931 struct ifinfomsg *hdr;
5932 struct nlmsghdr *nlh;
5933 void *protoinfo;
5934
5935 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5936 if (!nlh)
5937 return -EMSGSIZE;
5938
5939 hdr = nlmsg_data(nlh);
5940 hdr->ifi_family = AF_INET6;
5941 hdr->__ifi_pad = 0;
5942 hdr->ifi_type = dev->type;
5943 hdr->ifi_index = dev->ifindex;
5944 hdr->ifi_flags = dev_get_flags(dev);
5945 hdr->ifi_change = 0;
5946
5947 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5948 (dev->addr_len &&
5949 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5950 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5951 (dev->ifindex != dev_get_iflink(dev) &&
5952 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5953 nla_put_u8(skb, IFLA_OPERSTATE,
5954 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5955 goto nla_put_failure;
5956 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5957 if (!protoinfo)
5958 goto nla_put_failure;
5959
5960 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5961 goto nla_put_failure;
5962
5963 nla_nest_end(skb, protoinfo);
5964 nlmsg_end(skb, nlh);
5965 return 0;
5966
5967nla_put_failure:
5968 nlmsg_cancel(skb, nlh);
5969 return -EMSGSIZE;
5970}
5971
5972static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5973 struct netlink_ext_ack *extack)
5974{
5975 struct ifinfomsg *ifm;
5976
5977 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5978 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5979 return -EINVAL;
5980 }
5981
5982 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5983 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5984 return -EINVAL;
5985 }
5986
5987 ifm = nlmsg_data(nlh);
5988 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5989 ifm->ifi_change || ifm->ifi_index) {
5990 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5991 return -EINVAL;
5992 }
5993
5994 return 0;
5995}
5996
5997static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5998{
5999 struct net *net = sock_net(skb->sk);
6000 int h, s_h;
6001 int idx = 0, s_idx;
6002 struct net_device *dev;
6003 struct inet6_dev *idev;
6004 struct hlist_head *head;
6005
6006 /* only requests using strict checking can pass data to
6007 * influence the dump
6008 */
6009 if (cb->strict_check) {
6010 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
6011
6012 if (err < 0)
6013 return err;
6014 }
6015
6016 s_h = cb->args[0];
6017 s_idx = cb->args[1];
6018
6019 rcu_read_lock();
6020 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
6021 idx = 0;
6022 head = &net->dev_index_head[h];
6023 hlist_for_each_entry_rcu(dev, head, index_hlist) {
6024 if (idx < s_idx)
6025 goto cont;
6026 idev = __in6_dev_get(dev);
6027 if (!idev)
6028 goto cont;
6029 if (inet6_fill_ifinfo(skb, idev,
6030 NETLINK_CB(cb->skb).portid,
6031 cb->nlh->nlmsg_seq,
6032 RTM_NEWLINK, NLM_F_MULTI) < 0)
6033 goto out;
6034cont:
6035 idx++;
6036 }
6037 }
6038out:
6039 rcu_read_unlock();
6040 cb->args[1] = idx;
6041 cb->args[0] = h;
6042
6043 return skb->len;
6044}
6045
6046void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
6047{
6048 struct sk_buff *skb;
6049 struct net *net = dev_net(idev->dev);
6050 int err = -ENOBUFS;
6051
6052 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
6053 if (!skb)
6054 goto errout;
6055
6056 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
6057 if (err < 0) {
6058 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
6059 WARN_ON(err == -EMSGSIZE);
6060 kfree_skb(skb);
6061 goto errout;
6062 }
6063 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
6064 return;
6065errout:
6066 if (err < 0)
6067 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
6068}
6069
6070static inline size_t inet6_prefix_nlmsg_size(void)
6071{
6072 return NLMSG_ALIGN(sizeof(struct prefixmsg))
6073 + nla_total_size(sizeof(struct in6_addr))
6074 + nla_total_size(sizeof(struct prefix_cacheinfo));
6075}
6076
6077static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6078 struct prefix_info *pinfo, u32 portid, u32 seq,
6079 int event, unsigned int flags)
6080{
6081 struct prefixmsg *pmsg;
6082 struct nlmsghdr *nlh;
6083 struct prefix_cacheinfo ci;
6084
6085 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6086 if (!nlh)
6087 return -EMSGSIZE;
6088
6089 pmsg = nlmsg_data(nlh);
6090 pmsg->prefix_family = AF_INET6;
6091 pmsg->prefix_pad1 = 0;
6092 pmsg->prefix_pad2 = 0;
6093 pmsg->prefix_ifindex = idev->dev->ifindex;
6094 pmsg->prefix_len = pinfo->prefix_len;
6095 pmsg->prefix_type = pinfo->type;
6096 pmsg->prefix_pad3 = 0;
6097 pmsg->prefix_flags = 0;
6098 if (pinfo->onlink)
6099 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
6100 if (pinfo->autoconf)
6101 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
6102
6103 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6104 goto nla_put_failure;
6105 ci.preferred_time = ntohl(pinfo->prefered);
6106 ci.valid_time = ntohl(pinfo->valid);
6107 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6108 goto nla_put_failure;
6109 nlmsg_end(skb, nlh);
6110 return 0;
6111
6112nla_put_failure:
6113 nlmsg_cancel(skb, nlh);
6114 return -EMSGSIZE;
6115}
6116
6117static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6118 struct prefix_info *pinfo)
6119{
6120 struct sk_buff *skb;
6121 struct net *net = dev_net(idev->dev);
6122 int err = -ENOBUFS;
6123
6124 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6125 if (!skb)
6126 goto errout;
6127
6128 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6129 if (err < 0) {
6130 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6131 WARN_ON(err == -EMSGSIZE);
6132 kfree_skb(skb);
6133 goto errout;
6134 }
6135 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6136 return;
6137errout:
6138 if (err < 0)
6139 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6140}
6141
6142static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6143{
6144 struct net *net = dev_net(ifp->idev->dev);
6145
6146 if (event)
6147 ASSERT_RTNL();
6148
6149 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6150
6151 switch (event) {
6152 case RTM_NEWADDR:
6153 /*
6154 * If the address was optimistic we inserted the route at the
6155 * start of our DAD process, so we don't need to do it again.
6156 * If the device was taken down in the middle of the DAD
6157 * cycle there is a race where we could get here without a
6158 * host route, so nothing to insert. That will be fixed when
6159 * the device is brought up.
6160 */
6161 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6162 ip6_ins_rt(net, ifp->rt);
6163 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6164 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6165 &ifp->addr, ifp->idev->dev->name);
6166 }
6167
6168 if (ifp->idev->cnf.forwarding)
6169 addrconf_join_anycast(ifp);
6170 if (!ipv6_addr_any(&ifp->peer_addr))
6171 addrconf_prefix_route(&ifp->peer_addr, 128,
6172 ifp->rt_priority, ifp->idev->dev,
6173 0, 0, GFP_ATOMIC);
6174 break;
6175 case RTM_DELADDR:
6176 if (ifp->idev->cnf.forwarding)
6177 addrconf_leave_anycast(ifp);
6178 addrconf_leave_solict(ifp->idev, &ifp->addr);
6179 if (!ipv6_addr_any(&ifp->peer_addr)) {
6180 struct fib6_info *rt;
6181
6182 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6183 ifp->idev->dev, 0, 0,
6184 false);
6185 if (rt)
6186 ip6_del_rt(net, rt, false);
6187 }
6188 if (ifp->rt) {
6189 ip6_del_rt(net, ifp->rt, false);
6190 ifp->rt = NULL;
6191 }
6192 rt_genid_bump_ipv6(net);
6193 break;
6194 }
6195 atomic_inc(&net->ipv6.dev_addr_genid);
6196}
6197
6198static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6199{
6200 if (likely(ifp->idev->dead == 0))
6201 __ipv6_ifa_notify(event, ifp);
6202}
6203
6204#ifdef CONFIG_SYSCTL
6205
6206static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6207 void *buffer, size_t *lenp, loff_t *ppos)
6208{
6209 int *valp = ctl->data;
6210 int val = *valp;
6211 loff_t pos = *ppos;
6212 struct ctl_table lctl;
6213 int ret;
6214
6215 /*
6216 * ctl->data points to idev->cnf.forwarding, we should
6217 * not modify it until we get the rtnl lock.
6218 */
6219 lctl = *ctl;
6220 lctl.data = &val;
6221
6222 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6223
6224 if (write)
6225 ret = addrconf_fixup_forwarding(ctl, valp, val);
6226 if (ret)
6227 *ppos = pos;
6228 return ret;
6229}
6230
6231static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6232 void *buffer, size_t *lenp, loff_t *ppos)
6233{
6234 struct inet6_dev *idev = ctl->extra1;
6235 int min_mtu = IPV6_MIN_MTU;
6236 struct ctl_table lctl;
6237
6238 lctl = *ctl;
6239 lctl.extra1 = &min_mtu;
6240 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6241
6242 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6243}
6244
6245static void dev_disable_change(struct inet6_dev *idev)
6246{
6247 struct netdev_notifier_info info;
6248
6249 if (!idev || !idev->dev)
6250 return;
6251
6252 netdev_notifier_info_init(&info, idev->dev);
6253 if (idev->cnf.disable_ipv6)
6254 addrconf_notify(NULL, NETDEV_DOWN, &info);
6255 else
6256 addrconf_notify(NULL, NETDEV_UP, &info);
6257}
6258
6259static void addrconf_disable_change(struct net *net, __s32 newf)
6260{
6261 struct net_device *dev;
6262 struct inet6_dev *idev;
6263
6264 for_each_netdev(net, dev) {
6265 idev = __in6_dev_get(dev);
6266 if (idev) {
6267 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6268 idev->cnf.disable_ipv6 = newf;
6269 if (changed)
6270 dev_disable_change(idev);
6271 }
6272 }
6273}
6274
6275static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6276{
6277 struct net *net;
6278 int old;
6279
6280 if (!rtnl_trylock())
6281 return restart_syscall();
6282
6283 net = (struct net *)table->extra2;
6284 old = *p;
6285 *p = newf;
6286
6287 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6288 rtnl_unlock();
6289 return 0;
6290 }
6291
6292 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6293 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6294 addrconf_disable_change(net, newf);
6295 } else if ((!newf) ^ (!old))
6296 dev_disable_change((struct inet6_dev *)table->extra1);
6297
6298 rtnl_unlock();
6299 return 0;
6300}
6301
6302static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6303 void *buffer, size_t *lenp, loff_t *ppos)
6304{
6305 int *valp = ctl->data;
6306 int val = *valp;
6307 loff_t pos = *ppos;
6308 struct ctl_table lctl;
6309 int ret;
6310
6311 /*
6312 * ctl->data points to idev->cnf.disable_ipv6, we should
6313 * not modify it until we get the rtnl lock.
6314 */
6315 lctl = *ctl;
6316 lctl.data = &val;
6317
6318 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6319
6320 if (write)
6321 ret = addrconf_disable_ipv6(ctl, valp, val);
6322 if (ret)
6323 *ppos = pos;
6324 return ret;
6325}
6326
6327static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6328 void *buffer, size_t *lenp, loff_t *ppos)
6329{
6330 int *valp = ctl->data;
6331 int ret;
6332 int old, new;
6333
6334 old = *valp;
6335 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6336 new = *valp;
6337
6338 if (write && old != new) {
6339 struct net *net = ctl->extra2;
6340
6341 if (!rtnl_trylock())
6342 return restart_syscall();
6343
6344 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6345 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6346 NETCONFA_PROXY_NEIGH,
6347 NETCONFA_IFINDEX_DEFAULT,
6348 net->ipv6.devconf_dflt);
6349 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6350 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6351 NETCONFA_PROXY_NEIGH,
6352 NETCONFA_IFINDEX_ALL,
6353 net->ipv6.devconf_all);
6354 else {
6355 struct inet6_dev *idev = ctl->extra1;
6356
6357 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6358 NETCONFA_PROXY_NEIGH,
6359 idev->dev->ifindex,
6360 &idev->cnf);
6361 }
6362 rtnl_unlock();
6363 }
6364
6365 return ret;
6366}
6367
6368static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6369 void *buffer, size_t *lenp,
6370 loff_t *ppos)
6371{
6372 int ret = 0;
6373 u32 new_val;
6374 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6375 struct net *net = (struct net *)ctl->extra2;
6376 struct ctl_table tmp = {
6377 .data = &new_val,
6378 .maxlen = sizeof(new_val),
6379 .mode = ctl->mode,
6380 };
6381
6382 if (!rtnl_trylock())
6383 return restart_syscall();
6384
6385 new_val = *((u32 *)ctl->data);
6386
6387 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6388 if (ret != 0)
6389 goto out;
6390
6391 if (write) {
6392 if (check_addr_gen_mode(new_val) < 0) {
6393 ret = -EINVAL;
6394 goto out;
6395 }
6396
6397 if (idev) {
6398 if (check_stable_privacy(idev, net, new_val) < 0) {
6399 ret = -EINVAL;
6400 goto out;
6401 }
6402
6403 if (idev->cnf.addr_gen_mode != new_val) {
6404 idev->cnf.addr_gen_mode = new_val;
6405 addrconf_init_auto_addrs(idev->dev);
6406 }
6407 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6408 struct net_device *dev;
6409
6410 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6411 for_each_netdev(net, dev) {
6412 idev = __in6_dev_get(dev);
6413 if (idev &&
6414 idev->cnf.addr_gen_mode != new_val) {
6415 idev->cnf.addr_gen_mode = new_val;
6416 addrconf_init_auto_addrs(idev->dev);
6417 }
6418 }
6419 }
6420
6421 *((u32 *)ctl->data) = new_val;
6422 }
6423
6424out:
6425 rtnl_unlock();
6426
6427 return ret;
6428}
6429
6430static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6431 void *buffer, size_t *lenp,
6432 loff_t *ppos)
6433{
6434 int err;
6435 struct in6_addr addr;
6436 char str[IPV6_MAX_STRLEN];
6437 struct ctl_table lctl = *ctl;
6438 struct net *net = ctl->extra2;
6439 struct ipv6_stable_secret *secret = ctl->data;
6440
6441 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6442 return -EIO;
6443
6444 lctl.maxlen = IPV6_MAX_STRLEN;
6445 lctl.data = str;
6446
6447 if (!rtnl_trylock())
6448 return restart_syscall();
6449
6450 if (!write && !secret->initialized) {
6451 err = -EIO;
6452 goto out;
6453 }
6454
6455 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6456 if (err >= sizeof(str)) {
6457 err = -EIO;
6458 goto out;
6459 }
6460
6461 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6462 if (err || !write)
6463 goto out;
6464
6465 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6466 err = -EIO;
6467 goto out;
6468 }
6469
6470 secret->initialized = true;
6471 secret->secret = addr;
6472
6473 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6474 struct net_device *dev;
6475
6476 for_each_netdev(net, dev) {
6477 struct inet6_dev *idev = __in6_dev_get(dev);
6478
6479 if (idev) {
6480 idev->cnf.addr_gen_mode =
6481 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6482 }
6483 }
6484 } else {
6485 struct inet6_dev *idev = ctl->extra1;
6486
6487 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6488 }
6489
6490out:
6491 rtnl_unlock();
6492
6493 return err;
6494}
6495
6496static
6497int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6498 int write, void *buffer,
6499 size_t *lenp,
6500 loff_t *ppos)
6501{
6502 int *valp = ctl->data;
6503 int val = *valp;
6504 loff_t pos = *ppos;
6505 struct ctl_table lctl;
6506 int ret;
6507
6508 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6509 * we should not modify it until we get the rtnl lock.
6510 */
6511 lctl = *ctl;
6512 lctl.data = &val;
6513
6514 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6515
6516 if (write)
6517 ret = addrconf_fixup_linkdown(ctl, valp, val);
6518 if (ret)
6519 *ppos = pos;
6520 return ret;
6521}
6522
6523static
6524void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6525{
6526 if (rt) {
6527 if (action)
6528 rt->dst.flags |= DST_NOPOLICY;
6529 else
6530 rt->dst.flags &= ~DST_NOPOLICY;
6531 }
6532}
6533
6534static
6535void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6536{
6537 struct inet6_ifaddr *ifa;
6538
6539 read_lock_bh(&idev->lock);
6540 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6541 spin_lock(&ifa->lock);
6542 if (ifa->rt) {
6543 /* host routes only use builtin fib6_nh */
6544 struct fib6_nh *nh = ifa->rt->fib6_nh;
6545 int cpu;
6546
6547 rcu_read_lock();
6548 ifa->rt->dst_nopolicy = val ? true : false;
6549 if (nh->rt6i_pcpu) {
6550 for_each_possible_cpu(cpu) {
6551 struct rt6_info **rtp;
6552
6553 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6554 addrconf_set_nopolicy(*rtp, val);
6555 }
6556 }
6557 rcu_read_unlock();
6558 }
6559 spin_unlock(&ifa->lock);
6560 }
6561 read_unlock_bh(&idev->lock);
6562}
6563
6564static
6565int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6566{
6567 struct inet6_dev *idev;
6568 struct net *net;
6569
6570 if (!rtnl_trylock())
6571 return restart_syscall();
6572
6573 *valp = val;
6574
6575 net = (struct net *)ctl->extra2;
6576 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6577 rtnl_unlock();
6578 return 0;
6579 }
6580
6581 if (valp == &net->ipv6.devconf_all->disable_policy) {
6582 struct net_device *dev;
6583
6584 for_each_netdev(net, dev) {
6585 idev = __in6_dev_get(dev);
6586 if (idev)
6587 addrconf_disable_policy_idev(idev, val);
6588 }
6589 } else {
6590 idev = (struct inet6_dev *)ctl->extra1;
6591 addrconf_disable_policy_idev(idev, val);
6592 }
6593
6594 rtnl_unlock();
6595 return 0;
6596}
6597
6598static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6599 void *buffer, size_t *lenp, loff_t *ppos)
6600{
6601 int *valp = ctl->data;
6602 int val = *valp;
6603 loff_t pos = *ppos;
6604 struct ctl_table lctl;
6605 int ret;
6606
6607 lctl = *ctl;
6608 lctl.data = &val;
6609 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6610
6611 if (write && (*valp != val))
6612 ret = addrconf_disable_policy(ctl, valp, val);
6613
6614 if (ret)
6615 *ppos = pos;
6616
6617 return ret;
6618}
6619
6620static int minus_one = -1;
6621static const int two_five_five = 255;
6622static u32 ioam6_if_id_max = U16_MAX;
6623
6624static const struct ctl_table addrconf_sysctl[] = {
6625 {
6626 .procname = "forwarding",
6627 .data = &ipv6_devconf.forwarding,
6628 .maxlen = sizeof(int),
6629 .mode = 0644,
6630 .proc_handler = addrconf_sysctl_forward,
6631 },
6632 {
6633 .procname = "hop_limit",
6634 .data = &ipv6_devconf.hop_limit,
6635 .maxlen = sizeof(int),
6636 .mode = 0644,
6637 .proc_handler = proc_dointvec_minmax,
6638 .extra1 = (void *)SYSCTL_ONE,
6639 .extra2 = (void *)&two_five_five,
6640 },
6641 {
6642 .procname = "mtu",
6643 .data = &ipv6_devconf.mtu6,
6644 .maxlen = sizeof(int),
6645 .mode = 0644,
6646 .proc_handler = addrconf_sysctl_mtu,
6647 },
6648 {
6649 .procname = "accept_ra",
6650 .data = &ipv6_devconf.accept_ra,
6651 .maxlen = sizeof(int),
6652 .mode = 0644,
6653 .proc_handler = proc_dointvec,
6654 },
6655 {
6656 .procname = "accept_redirects",
6657 .data = &ipv6_devconf.accept_redirects,
6658 .maxlen = sizeof(int),
6659 .mode = 0644,
6660 .proc_handler = proc_dointvec,
6661 },
6662 {
6663 .procname = "autoconf",
6664 .data = &ipv6_devconf.autoconf,
6665 .maxlen = sizeof(int),
6666 .mode = 0644,
6667 .proc_handler = proc_dointvec,
6668 },
6669 {
6670 .procname = "dad_transmits",
6671 .data = &ipv6_devconf.dad_transmits,
6672 .maxlen = sizeof(int),
6673 .mode = 0644,
6674 .proc_handler = proc_dointvec,
6675 },
6676 {
6677 .procname = "router_solicitations",
6678 .data = &ipv6_devconf.rtr_solicits,
6679 .maxlen = sizeof(int),
6680 .mode = 0644,
6681 .proc_handler = proc_dointvec_minmax,
6682 .extra1 = &minus_one,
6683 },
6684 {
6685 .procname = "router_solicitation_interval",
6686 .data = &ipv6_devconf.rtr_solicit_interval,
6687 .maxlen = sizeof(int),
6688 .mode = 0644,
6689 .proc_handler = proc_dointvec_jiffies,
6690 },
6691 {
6692 .procname = "router_solicitation_max_interval",
6693 .data = &ipv6_devconf.rtr_solicit_max_interval,
6694 .maxlen = sizeof(int),
6695 .mode = 0644,
6696 .proc_handler = proc_dointvec_jiffies,
6697 },
6698 {
6699 .procname = "router_solicitation_delay",
6700 .data = &ipv6_devconf.rtr_solicit_delay,
6701 .maxlen = sizeof(int),
6702 .mode = 0644,
6703 .proc_handler = proc_dointvec_jiffies,
6704 },
6705 {
6706 .procname = "force_mld_version",
6707 .data = &ipv6_devconf.force_mld_version,
6708 .maxlen = sizeof(int),
6709 .mode = 0644,
6710 .proc_handler = proc_dointvec,
6711 },
6712 {
6713 .procname = "mldv1_unsolicited_report_interval",
6714 .data =
6715 &ipv6_devconf.mldv1_unsolicited_report_interval,
6716 .maxlen = sizeof(int),
6717 .mode = 0644,
6718 .proc_handler = proc_dointvec_ms_jiffies,
6719 },
6720 {
6721 .procname = "mldv2_unsolicited_report_interval",
6722 .data =
6723 &ipv6_devconf.mldv2_unsolicited_report_interval,
6724 .maxlen = sizeof(int),
6725 .mode = 0644,
6726 .proc_handler = proc_dointvec_ms_jiffies,
6727 },
6728 {
6729 .procname = "use_tempaddr",
6730 .data = &ipv6_devconf.use_tempaddr,
6731 .maxlen = sizeof(int),
6732 .mode = 0644,
6733 .proc_handler = proc_dointvec,
6734 },
6735 {
6736 .procname = "temp_valid_lft",
6737 .data = &ipv6_devconf.temp_valid_lft,
6738 .maxlen = sizeof(int),
6739 .mode = 0644,
6740 .proc_handler = proc_dointvec,
6741 },
6742 {
6743 .procname = "temp_prefered_lft",
6744 .data = &ipv6_devconf.temp_prefered_lft,
6745 .maxlen = sizeof(int),
6746 .mode = 0644,
6747 .proc_handler = proc_dointvec,
6748 },
6749 {
6750 .procname = "regen_max_retry",
6751 .data = &ipv6_devconf.regen_max_retry,
6752 .maxlen = sizeof(int),
6753 .mode = 0644,
6754 .proc_handler = proc_dointvec,
6755 },
6756 {
6757 .procname = "max_desync_factor",
6758 .data = &ipv6_devconf.max_desync_factor,
6759 .maxlen = sizeof(int),
6760 .mode = 0644,
6761 .proc_handler = proc_dointvec,
6762 },
6763 {
6764 .procname = "max_addresses",
6765 .data = &ipv6_devconf.max_addresses,
6766 .maxlen = sizeof(int),
6767 .mode = 0644,
6768 .proc_handler = proc_dointvec,
6769 },
6770 {
6771 .procname = "accept_ra_defrtr",
6772 .data = &ipv6_devconf.accept_ra_defrtr,
6773 .maxlen = sizeof(int),
6774 .mode = 0644,
6775 .proc_handler = proc_dointvec,
6776 },
6777 {
6778 .procname = "ra_defrtr_metric",
6779 .data = &ipv6_devconf.ra_defrtr_metric,
6780 .maxlen = sizeof(u32),
6781 .mode = 0644,
6782 .proc_handler = proc_douintvec_minmax,
6783 .extra1 = (void *)SYSCTL_ONE,
6784 },
6785 {
6786 .procname = "accept_ra_min_hop_limit",
6787 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6788 .maxlen = sizeof(int),
6789 .mode = 0644,
6790 .proc_handler = proc_dointvec,
6791 },
6792 {
6793 .procname = "accept_ra_pinfo",
6794 .data = &ipv6_devconf.accept_ra_pinfo,
6795 .maxlen = sizeof(int),
6796 .mode = 0644,
6797 .proc_handler = proc_dointvec,
6798 },
6799#ifdef CONFIG_IPV6_ROUTER_PREF
6800 {
6801 .procname = "accept_ra_rtr_pref",
6802 .data = &ipv6_devconf.accept_ra_rtr_pref,
6803 .maxlen = sizeof(int),
6804 .mode = 0644,
6805 .proc_handler = proc_dointvec,
6806 },
6807 {
6808 .procname = "router_probe_interval",
6809 .data = &ipv6_devconf.rtr_probe_interval,
6810 .maxlen = sizeof(int),
6811 .mode = 0644,
6812 .proc_handler = proc_dointvec_jiffies,
6813 },
6814#ifdef CONFIG_IPV6_ROUTE_INFO
6815 {
6816 .procname = "accept_ra_rt_info_min_plen",
6817 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6818 .maxlen = sizeof(int),
6819 .mode = 0644,
6820 .proc_handler = proc_dointvec,
6821 },
6822 {
6823 .procname = "accept_ra_rt_info_max_plen",
6824 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6825 .maxlen = sizeof(int),
6826 .mode = 0644,
6827 .proc_handler = proc_dointvec,
6828 },
6829#endif
6830#endif
6831 {
6832 .procname = "proxy_ndp",
6833 .data = &ipv6_devconf.proxy_ndp,
6834 .maxlen = sizeof(int),
6835 .mode = 0644,
6836 .proc_handler = addrconf_sysctl_proxy_ndp,
6837 },
6838 {
6839 .procname = "accept_source_route",
6840 .data = &ipv6_devconf.accept_source_route,
6841 .maxlen = sizeof(int),
6842 .mode = 0644,
6843 .proc_handler = proc_dointvec,
6844 },
6845#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6846 {
6847 .procname = "optimistic_dad",
6848 .data = &ipv6_devconf.optimistic_dad,
6849 .maxlen = sizeof(int),
6850 .mode = 0644,
6851 .proc_handler = proc_dointvec,
6852 },
6853 {
6854 .procname = "use_optimistic",
6855 .data = &ipv6_devconf.use_optimistic,
6856 .maxlen = sizeof(int),
6857 .mode = 0644,
6858 .proc_handler = proc_dointvec,
6859 },
6860#endif
6861#ifdef CONFIG_IPV6_MROUTE
6862 {
6863 .procname = "mc_forwarding",
6864 .data = &ipv6_devconf.mc_forwarding,
6865 .maxlen = sizeof(int),
6866 .mode = 0444,
6867 .proc_handler = proc_dointvec,
6868 },
6869#endif
6870 {
6871 .procname = "disable_ipv6",
6872 .data = &ipv6_devconf.disable_ipv6,
6873 .maxlen = sizeof(int),
6874 .mode = 0644,
6875 .proc_handler = addrconf_sysctl_disable,
6876 },
6877 {
6878 .procname = "accept_dad",
6879 .data = &ipv6_devconf.accept_dad,
6880 .maxlen = sizeof(int),
6881 .mode = 0644,
6882 .proc_handler = proc_dointvec,
6883 },
6884 {
6885 .procname = "force_tllao",
6886 .data = &ipv6_devconf.force_tllao,
6887 .maxlen = sizeof(int),
6888 .mode = 0644,
6889 .proc_handler = proc_dointvec
6890 },
6891 {
6892 .procname = "ndisc_notify",
6893 .data = &ipv6_devconf.ndisc_notify,
6894 .maxlen = sizeof(int),
6895 .mode = 0644,
6896 .proc_handler = proc_dointvec
6897 },
6898 {
6899 .procname = "suppress_frag_ndisc",
6900 .data = &ipv6_devconf.suppress_frag_ndisc,
6901 .maxlen = sizeof(int),
6902 .mode = 0644,
6903 .proc_handler = proc_dointvec
6904 },
6905 {
6906 .procname = "accept_ra_from_local",
6907 .data = &ipv6_devconf.accept_ra_from_local,
6908 .maxlen = sizeof(int),
6909 .mode = 0644,
6910 .proc_handler = proc_dointvec,
6911 },
6912 {
6913 .procname = "accept_ra_mtu",
6914 .data = &ipv6_devconf.accept_ra_mtu,
6915 .maxlen = sizeof(int),
6916 .mode = 0644,
6917 .proc_handler = proc_dointvec,
6918 },
6919 {
6920 .procname = "stable_secret",
6921 .data = &ipv6_devconf.stable_secret,
6922 .maxlen = IPV6_MAX_STRLEN,
6923 .mode = 0600,
6924 .proc_handler = addrconf_sysctl_stable_secret,
6925 },
6926 {
6927 .procname = "use_oif_addrs_only",
6928 .data = &ipv6_devconf.use_oif_addrs_only,
6929 .maxlen = sizeof(int),
6930 .mode = 0644,
6931 .proc_handler = proc_dointvec,
6932 },
6933 {
6934 .procname = "ignore_routes_with_linkdown",
6935 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6936 .maxlen = sizeof(int),
6937 .mode = 0644,
6938 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6939 },
6940 {
6941 .procname = "drop_unicast_in_l2_multicast",
6942 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6943 .maxlen = sizeof(int),
6944 .mode = 0644,
6945 .proc_handler = proc_dointvec,
6946 },
6947 {
6948 .procname = "drop_unsolicited_na",
6949 .data = &ipv6_devconf.drop_unsolicited_na,
6950 .maxlen = sizeof(int),
6951 .mode = 0644,
6952 .proc_handler = proc_dointvec,
6953 },
6954 {
6955 .procname = "keep_addr_on_down",
6956 .data = &ipv6_devconf.keep_addr_on_down,
6957 .maxlen = sizeof(int),
6958 .mode = 0644,
6959 .proc_handler = proc_dointvec,
6960
6961 },
6962 {
6963 .procname = "seg6_enabled",
6964 .data = &ipv6_devconf.seg6_enabled,
6965 .maxlen = sizeof(int),
6966 .mode = 0644,
6967 .proc_handler = proc_dointvec,
6968 },
6969#ifdef CONFIG_IPV6_SEG6_HMAC
6970 {
6971 .procname = "seg6_require_hmac",
6972 .data = &ipv6_devconf.seg6_require_hmac,
6973 .maxlen = sizeof(int),
6974 .mode = 0644,
6975 .proc_handler = proc_dointvec,
6976 },
6977#endif
6978 {
6979 .procname = "enhanced_dad",
6980 .data = &ipv6_devconf.enhanced_dad,
6981 .maxlen = sizeof(int),
6982 .mode = 0644,
6983 .proc_handler = proc_dointvec,
6984 },
6985 {
6986 .procname = "addr_gen_mode",
6987 .data = &ipv6_devconf.addr_gen_mode,
6988 .maxlen = sizeof(int),
6989 .mode = 0644,
6990 .proc_handler = addrconf_sysctl_addr_gen_mode,
6991 },
6992 {
6993 .procname = "disable_policy",
6994 .data = &ipv6_devconf.disable_policy,
6995 .maxlen = sizeof(int),
6996 .mode = 0644,
6997 .proc_handler = addrconf_sysctl_disable_policy,
6998 },
6999 {
7000 .procname = "ndisc_tclass",
7001 .data = &ipv6_devconf.ndisc_tclass,
7002 .maxlen = sizeof(int),
7003 .mode = 0644,
7004 .proc_handler = proc_dointvec_minmax,
7005 .extra1 = (void *)SYSCTL_ZERO,
7006 .extra2 = (void *)&two_five_five,
7007 },
7008 {
7009 .procname = "rpl_seg_enabled",
7010 .data = &ipv6_devconf.rpl_seg_enabled,
7011 .maxlen = sizeof(int),
7012 .mode = 0644,
7013 .proc_handler = proc_dointvec,
7014 },
7015 {
7016 .procname = "ioam6_enabled",
7017 .data = &ipv6_devconf.ioam6_enabled,
7018 .maxlen = sizeof(u8),
7019 .mode = 0644,
7020 .proc_handler = proc_dou8vec_minmax,
7021 .extra1 = (void *)SYSCTL_ZERO,
7022 .extra2 = (void *)SYSCTL_ONE,
7023 },
7024 {
7025 .procname = "ioam6_id",
7026 .data = &ipv6_devconf.ioam6_id,
7027 .maxlen = sizeof(u32),
7028 .mode = 0644,
7029 .proc_handler = proc_douintvec_minmax,
7030 .extra1 = (void *)SYSCTL_ZERO,
7031 .extra2 = (void *)&ioam6_if_id_max,
7032 },
7033 {
7034 .procname = "ioam6_id_wide",
7035 .data = &ipv6_devconf.ioam6_id_wide,
7036 .maxlen = sizeof(u32),
7037 .mode = 0644,
7038 .proc_handler = proc_douintvec,
7039 },
7040 {
7041 .procname = "ndisc_evict_nocarrier",
7042 .data = &ipv6_devconf.ndisc_evict_nocarrier,
7043 .maxlen = sizeof(u8),
7044 .mode = 0644,
7045 .proc_handler = proc_dou8vec_minmax,
7046 .extra1 = (void *)SYSCTL_ZERO,
7047 .extra2 = (void *)SYSCTL_ONE,
7048 },
7049 {
7050 .procname = "accept_untracked_na",
7051 .data = &ipv6_devconf.accept_untracked_na,
7052 .maxlen = sizeof(int),
7053 .mode = 0644,
7054 .proc_handler = proc_dointvec_minmax,
7055 .extra1 = SYSCTL_ZERO,
7056 .extra2 = SYSCTL_TWO,
7057 },
7058 {
7059 /* sentinel */
7060 }
7061};
7062
7063static int __addrconf_sysctl_register(struct net *net, char *dev_name,
7064 struct inet6_dev *idev, struct ipv6_devconf *p)
7065{
7066 int i, ifindex;
7067 struct ctl_table *table;
7068 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
7069
7070 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT);
7071 if (!table)
7072 goto out;
7073
7074 for (i = 0; table[i].data; i++) {
7075 table[i].data += (char *)p - (char *)&ipv6_devconf;
7076 /* If one of these is already set, then it is not safe to
7077 * overwrite either of them: this makes proc_dointvec_minmax
7078 * usable.
7079 */
7080 if (!table[i].extra1 && !table[i].extra2) {
7081 table[i].extra1 = idev; /* embedded; no ref */
7082 table[i].extra2 = net;
7083 }
7084 }
7085
7086 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
7087
7088 p->sysctl_header = register_net_sysctl(net, path, table);
7089 if (!p->sysctl_header)
7090 goto free;
7091
7092 if (!strcmp(dev_name, "all"))
7093 ifindex = NETCONFA_IFINDEX_ALL;
7094 else if (!strcmp(dev_name, "default"))
7095 ifindex = NETCONFA_IFINDEX_DEFAULT;
7096 else
7097 ifindex = idev->dev->ifindex;
7098 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7099 ifindex, p);
7100 return 0;
7101
7102free:
7103 kfree(table);
7104out:
7105 return -ENOBUFS;
7106}
7107
7108static void __addrconf_sysctl_unregister(struct net *net,
7109 struct ipv6_devconf *p, int ifindex)
7110{
7111 struct ctl_table *table;
7112
7113 if (!p->sysctl_header)
7114 return;
7115
7116 table = p->sysctl_header->ctl_table_arg;
7117 unregister_net_sysctl_table(p->sysctl_header);
7118 p->sysctl_header = NULL;
7119 kfree(table);
7120
7121 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
7122}
7123
7124static int addrconf_sysctl_register(struct inet6_dev *idev)
7125{
7126 int err;
7127
7128 if (!sysctl_dev_name_is_allowed(idev->dev->name))
7129 return -EINVAL;
7130
7131 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7132 &ndisc_ifinfo_sysctl_change);
7133 if (err)
7134 return err;
7135 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7136 idev, &idev->cnf);
7137 if (err)
7138 neigh_sysctl_unregister(idev->nd_parms);
7139
7140 return err;
7141}
7142
7143static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7144{
7145 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7146 idev->dev->ifindex);
7147 neigh_sysctl_unregister(idev->nd_parms);
7148}
7149
7150
7151#endif
7152
7153static int __net_init addrconf_init_net(struct net *net)
7154{
7155 int err = -ENOMEM;
7156 struct ipv6_devconf *all, *dflt;
7157
7158 spin_lock_init(&net->ipv6.addrconf_hash_lock);
7159 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work);
7160 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE,
7161 sizeof(struct hlist_head),
7162 GFP_KERNEL);
7163 if (!net->ipv6.inet6_addr_lst)
7164 goto err_alloc_addr;
7165
7166 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7167 if (!all)
7168 goto err_alloc_all;
7169
7170 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7171 if (!dflt)
7172 goto err_alloc_dflt;
7173
7174 if (!net_eq(net, &init_net)) {
7175 switch (net_inherit_devconf()) {
7176 case 1: /* copy from init_net */
7177 memcpy(all, init_net.ipv6.devconf_all,
7178 sizeof(ipv6_devconf));
7179 memcpy(dflt, init_net.ipv6.devconf_dflt,
7180 sizeof(ipv6_devconf_dflt));
7181 break;
7182 case 3: /* copy from the current netns */
7183 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7184 sizeof(ipv6_devconf));
7185 memcpy(dflt,
7186 current->nsproxy->net_ns->ipv6.devconf_dflt,
7187 sizeof(ipv6_devconf_dflt));
7188 break;
7189 case 0:
7190 case 2:
7191 /* use compiled values */
7192 break;
7193 }
7194 }
7195
7196 /* these will be inherited by all namespaces */
7197 dflt->autoconf = ipv6_defaults.autoconf;
7198 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7199
7200 dflt->stable_secret.initialized = false;
7201 all->stable_secret.initialized = false;
7202
7203 net->ipv6.devconf_all = all;
7204 net->ipv6.devconf_dflt = dflt;
7205
7206#ifdef CONFIG_SYSCTL
7207 err = __addrconf_sysctl_register(net, "all", NULL, all);
7208 if (err < 0)
7209 goto err_reg_all;
7210
7211 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7212 if (err < 0)
7213 goto err_reg_dflt;
7214#endif
7215 return 0;
7216
7217#ifdef CONFIG_SYSCTL
7218err_reg_dflt:
7219 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7220err_reg_all:
7221 kfree(dflt);
7222 net->ipv6.devconf_dflt = NULL;
7223#endif
7224err_alloc_dflt:
7225 kfree(all);
7226 net->ipv6.devconf_all = NULL;
7227err_alloc_all:
7228 kfree(net->ipv6.inet6_addr_lst);
7229err_alloc_addr:
7230 return err;
7231}
7232
7233static void __net_exit addrconf_exit_net(struct net *net)
7234{
7235 int i;
7236
7237#ifdef CONFIG_SYSCTL
7238 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7239 NETCONFA_IFINDEX_DEFAULT);
7240 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7241 NETCONFA_IFINDEX_ALL);
7242#endif
7243 kfree(net->ipv6.devconf_dflt);
7244 net->ipv6.devconf_dflt = NULL;
7245 kfree(net->ipv6.devconf_all);
7246 net->ipv6.devconf_all = NULL;
7247
7248 cancel_delayed_work_sync(&net->ipv6.addr_chk_work);
7249 /*
7250 * Check hash table, then free it.
7251 */
7252 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7253 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i]));
7254
7255 kfree(net->ipv6.inet6_addr_lst);
7256 net->ipv6.inet6_addr_lst = NULL;
7257}
7258
7259static struct pernet_operations addrconf_ops = {
7260 .init = addrconf_init_net,
7261 .exit = addrconf_exit_net,
7262};
7263
7264static struct rtnl_af_ops inet6_ops __read_mostly = {
7265 .family = AF_INET6,
7266 .fill_link_af = inet6_fill_link_af,
7267 .get_link_af_size = inet6_get_link_af_size,
7268 .validate_link_af = inet6_validate_link_af,
7269 .set_link_af = inet6_set_link_af,
7270};
7271
7272/*
7273 * Init / cleanup code
7274 */
7275
7276int __init addrconf_init(void)
7277{
7278 struct inet6_dev *idev;
7279 int err;
7280
7281 err = ipv6_addr_label_init();
7282 if (err < 0) {
7283 pr_crit("%s: cannot initialize default policy table: %d\n",
7284 __func__, err);
7285 goto out;
7286 }
7287
7288 err = register_pernet_subsys(&addrconf_ops);
7289 if (err < 0)
7290 goto out_addrlabel;
7291
7292 addrconf_wq = create_workqueue("ipv6_addrconf");
7293 if (!addrconf_wq) {
7294 err = -ENOMEM;
7295 goto out_nowq;
7296 }
7297
7298 rtnl_lock();
7299 idev = ipv6_add_dev(blackhole_netdev);
7300 rtnl_unlock();
7301 if (IS_ERR(idev)) {
7302 err = PTR_ERR(idev);
7303 goto errlo;
7304 }
7305
7306 ip6_route_init_special_entries();
7307
7308 register_netdevice_notifier(&ipv6_dev_notf);
7309
7310 addrconf_verify(&init_net);
7311
7312 rtnl_af_register(&inet6_ops);
7313
7314 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7315 NULL, inet6_dump_ifinfo, 0);
7316 if (err < 0)
7317 goto errout;
7318
7319 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7320 inet6_rtm_newaddr, NULL, 0);
7321 if (err < 0)
7322 goto errout;
7323 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7324 inet6_rtm_deladdr, NULL, 0);
7325 if (err < 0)
7326 goto errout;
7327 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7328 inet6_rtm_getaddr, inet6_dump_ifaddr,
7329 RTNL_FLAG_DOIT_UNLOCKED);
7330 if (err < 0)
7331 goto errout;
7332 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7333 NULL, inet6_dump_ifmcaddr, 0);
7334 if (err < 0)
7335 goto errout;
7336 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7337 NULL, inet6_dump_ifacaddr, 0);
7338 if (err < 0)
7339 goto errout;
7340 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7341 inet6_netconf_get_devconf,
7342 inet6_netconf_dump_devconf,
7343 RTNL_FLAG_DOIT_UNLOCKED);
7344 if (err < 0)
7345 goto errout;
7346 err = ipv6_addr_label_rtnl_register();
7347 if (err < 0)
7348 goto errout;
7349
7350 return 0;
7351errout:
7352 rtnl_unregister_all(PF_INET6);
7353 rtnl_af_unregister(&inet6_ops);
7354 unregister_netdevice_notifier(&ipv6_dev_notf);
7355errlo:
7356 destroy_workqueue(addrconf_wq);
7357out_nowq:
7358 unregister_pernet_subsys(&addrconf_ops);
7359out_addrlabel:
7360 ipv6_addr_label_cleanup();
7361out:
7362 return err;
7363}
7364
7365void addrconf_cleanup(void)
7366{
7367 struct net_device *dev;
7368
7369 unregister_netdevice_notifier(&ipv6_dev_notf);
7370 unregister_pernet_subsys(&addrconf_ops);
7371 ipv6_addr_label_cleanup();
7372
7373 rtnl_af_unregister(&inet6_ops);
7374
7375 rtnl_lock();
7376
7377 /* clean dev list */
7378 for_each_netdev(&init_net, dev) {
7379 if (__in6_dev_get(dev) == NULL)
7380 continue;
7381 addrconf_ifdown(dev, true);
7382 }
7383 addrconf_ifdown(init_net.loopback_dev, true);
7384
7385 rtnl_unlock();
7386
7387 destroy_workqueue(addrconf_wq);
7388}