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1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41#define pr_fmt(fmt) "IPv6: " fmt
42
43#include <linux/errno.h>
44#include <linux/types.h>
45#include <linux/kernel.h>
46#include <linux/socket.h>
47#include <linux/sockios.h>
48#include <linux/net.h>
49#include <linux/inet.h>
50#include <linux/in6.h>
51#include <linux/netdevice.h>
52#include <linux/if_addr.h>
53#include <linux/if_arp.h>
54#include <linux/if_arcnet.h>
55#include <linux/if_infiniband.h>
56#include <linux/route.h>
57#include <linux/inetdevice.h>
58#include <linux/init.h>
59#include <linux/slab.h>
60#ifdef CONFIG_SYSCTL
61#include <linux/sysctl.h>
62#endif
63#include <linux/capability.h>
64#include <linux/delay.h>
65#include <linux/notifier.h>
66#include <linux/string.h>
67#include <linux/hash.h>
68
69#include <net/net_namespace.h>
70#include <net/sock.h>
71#include <net/snmp.h>
72
73#include <net/6lowpan.h>
74#include <net/firewire.h>
75#include <net/ipv6.h>
76#include <net/protocol.h>
77#include <net/ndisc.h>
78#include <net/ip6_route.h>
79#include <net/addrconf.h>
80#include <net/tcp.h>
81#include <net/ip.h>
82#include <net/netlink.h>
83#include <net/pkt_sched.h>
84#include <net/l3mdev.h>
85#include <linux/if_tunnel.h>
86#include <linux/rtnetlink.h>
87#include <linux/netconf.h>
88#include <linux/random.h>
89#include <linux/uaccess.h>
90#include <asm/unaligned.h>
91
92#include <linux/proc_fs.h>
93#include <linux/seq_file.h>
94#include <linux/export.h>
95
96/* Set to 3 to get tracing... */
97#define ACONF_DEBUG 2
98
99#if ACONF_DEBUG >= 3
100#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
101#else
102#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
103#endif
104
105#define INFINITY_LIFE_TIME 0xFFFFFFFF
106
107#define IPV6_MAX_STRLEN \
108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109
110static inline u32 cstamp_delta(unsigned long cstamp)
111{
112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113}
114
115#ifdef CONFIG_SYSCTL
116static int addrconf_sysctl_register(struct inet6_dev *idev);
117static void addrconf_sysctl_unregister(struct inet6_dev *idev);
118#else
119static inline int addrconf_sysctl_register(struct inet6_dev *idev)
120{
121 return 0;
122}
123
124static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
125{
126}
127#endif
128
129static void __ipv6_regen_rndid(struct inet6_dev *idev);
130static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
131static void ipv6_regen_rndid(unsigned long data);
132
133static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
134static int ipv6_count_addresses(struct inet6_dev *idev);
135static int ipv6_generate_stable_address(struct in6_addr *addr,
136 u8 dad_count,
137 const struct inet6_dev *idev);
138
139/*
140 * Configured unicast address hash table
141 */
142static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
143static DEFINE_SPINLOCK(addrconf_hash_lock);
144
145static void addrconf_verify(void);
146static void addrconf_verify_rtnl(void);
147static void addrconf_verify_work(struct work_struct *);
148
149static struct workqueue_struct *addrconf_wq;
150static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
151
152static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
153static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
154
155static void addrconf_type_change(struct net_device *dev,
156 unsigned long event);
157static int addrconf_ifdown(struct net_device *dev, int how);
158
159static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
160 int plen,
161 const struct net_device *dev,
162 u32 flags, u32 noflags);
163
164static void addrconf_dad_start(struct inet6_ifaddr *ifp);
165static void addrconf_dad_work(struct work_struct *w);
166static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
167static void addrconf_dad_run(struct inet6_dev *idev);
168static void addrconf_rs_timer(unsigned long data);
169static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
171
172static void inet6_prefix_notify(int event, struct inet6_dev *idev,
173 struct prefix_info *pinfo);
174static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
175 struct net_device *dev);
176
177static struct ipv6_devconf ipv6_devconf __read_mostly = {
178 .forwarding = 0,
179 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
180 .mtu6 = IPV6_MIN_MTU,
181 .accept_ra = 1,
182 .accept_redirects = 1,
183 .autoconf = 1,
184 .force_mld_version = 0,
185 .mldv1_unsolicited_report_interval = 10 * HZ,
186 .mldv2_unsolicited_report_interval = HZ,
187 .dad_transmits = 1,
188 .rtr_solicits = MAX_RTR_SOLICITATIONS,
189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
191 .use_tempaddr = 0,
192 .temp_valid_lft = TEMP_VALID_LIFETIME,
193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
194 .regen_max_retry = REGEN_MAX_RETRY,
195 .max_desync_factor = MAX_DESYNC_FACTOR,
196 .max_addresses = IPV6_MAX_ADDRESSES,
197 .accept_ra_defrtr = 1,
198 .accept_ra_from_local = 0,
199 .accept_ra_min_hop_limit= 1,
200 .accept_ra_pinfo = 1,
201#ifdef CONFIG_IPV6_ROUTER_PREF
202 .accept_ra_rtr_pref = 1,
203 .rtr_probe_interval = 60 * HZ,
204#ifdef CONFIG_IPV6_ROUTE_INFO
205 .accept_ra_rt_info_max_plen = 0,
206#endif
207#endif
208 .proxy_ndp = 0,
209 .accept_source_route = 0, /* we do not accept RH0 by default. */
210 .disable_ipv6 = 0,
211 .accept_dad = 1,
212 .suppress_frag_ndisc = 1,
213 .accept_ra_mtu = 1,
214 .stable_secret = {
215 .initialized = false,
216 },
217 .use_oif_addrs_only = 0,
218 .ignore_routes_with_linkdown = 0,
219 .keep_addr_on_down = 0,
220};
221
222static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
223 .forwarding = 0,
224 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
225 .mtu6 = IPV6_MIN_MTU,
226 .accept_ra = 1,
227 .accept_redirects = 1,
228 .autoconf = 1,
229 .force_mld_version = 0,
230 .mldv1_unsolicited_report_interval = 10 * HZ,
231 .mldv2_unsolicited_report_interval = HZ,
232 .dad_transmits = 1,
233 .rtr_solicits = MAX_RTR_SOLICITATIONS,
234 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
235 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
236 .use_tempaddr = 0,
237 .temp_valid_lft = TEMP_VALID_LIFETIME,
238 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
239 .regen_max_retry = REGEN_MAX_RETRY,
240 .max_desync_factor = MAX_DESYNC_FACTOR,
241 .max_addresses = IPV6_MAX_ADDRESSES,
242 .accept_ra_defrtr = 1,
243 .accept_ra_from_local = 0,
244 .accept_ra_min_hop_limit= 1,
245 .accept_ra_pinfo = 1,
246#ifdef CONFIG_IPV6_ROUTER_PREF
247 .accept_ra_rtr_pref = 1,
248 .rtr_probe_interval = 60 * HZ,
249#ifdef CONFIG_IPV6_ROUTE_INFO
250 .accept_ra_rt_info_max_plen = 0,
251#endif
252#endif
253 .proxy_ndp = 0,
254 .accept_source_route = 0, /* we do not accept RH0 by default. */
255 .disable_ipv6 = 0,
256 .accept_dad = 1,
257 .suppress_frag_ndisc = 1,
258 .accept_ra_mtu = 1,
259 .stable_secret = {
260 .initialized = false,
261 },
262 .use_oif_addrs_only = 0,
263 .ignore_routes_with_linkdown = 0,
264 .keep_addr_on_down = 0,
265};
266
267/* Check if a valid qdisc is available */
268static inline bool addrconf_qdisc_ok(const struct net_device *dev)
269{
270 return !qdisc_tx_is_noop(dev);
271}
272
273static void addrconf_del_rs_timer(struct inet6_dev *idev)
274{
275 if (del_timer(&idev->rs_timer))
276 __in6_dev_put(idev);
277}
278
279static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
280{
281 if (cancel_delayed_work(&ifp->dad_work))
282 __in6_ifa_put(ifp);
283}
284
285static void addrconf_mod_rs_timer(struct inet6_dev *idev,
286 unsigned long when)
287{
288 if (!timer_pending(&idev->rs_timer))
289 in6_dev_hold(idev);
290 mod_timer(&idev->rs_timer, jiffies + when);
291}
292
293static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
294 unsigned long delay)
295{
296 if (!delayed_work_pending(&ifp->dad_work))
297 in6_ifa_hold(ifp);
298 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
299}
300
301static int snmp6_alloc_dev(struct inet6_dev *idev)
302{
303 int i;
304
305 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
306 if (!idev->stats.ipv6)
307 goto err_ip;
308
309 for_each_possible_cpu(i) {
310 struct ipstats_mib *addrconf_stats;
311 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
312 u64_stats_init(&addrconf_stats->syncp);
313 }
314
315
316 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
317 GFP_KERNEL);
318 if (!idev->stats.icmpv6dev)
319 goto err_icmp;
320 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
321 GFP_KERNEL);
322 if (!idev->stats.icmpv6msgdev)
323 goto err_icmpmsg;
324
325 return 0;
326
327err_icmpmsg:
328 kfree(idev->stats.icmpv6dev);
329err_icmp:
330 free_percpu(idev->stats.ipv6);
331err_ip:
332 return -ENOMEM;
333}
334
335static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
336{
337 struct inet6_dev *ndev;
338 int err = -ENOMEM;
339
340 ASSERT_RTNL();
341
342 if (dev->mtu < IPV6_MIN_MTU)
343 return ERR_PTR(-EINVAL);
344
345 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
346 if (!ndev)
347 return ERR_PTR(err);
348
349 rwlock_init(&ndev->lock);
350 ndev->dev = dev;
351 INIT_LIST_HEAD(&ndev->addr_list);
352 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
353 (unsigned long)ndev);
354 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
355
356 if (ndev->cnf.stable_secret.initialized)
357 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
358 else
359 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
360
361 ndev->cnf.mtu6 = dev->mtu;
362 ndev->cnf.sysctl = NULL;
363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
364 if (!ndev->nd_parms) {
365 kfree(ndev);
366 return ERR_PTR(err);
367 }
368 if (ndev->cnf.forwarding)
369 dev_disable_lro(dev);
370 /* We refer to the device */
371 dev_hold(dev);
372
373 if (snmp6_alloc_dev(ndev) < 0) {
374 ADBG(KERN_WARNING
375 "%s: cannot allocate memory for statistics; dev=%s.\n",
376 __func__, dev->name);
377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
378 dev_put(dev);
379 kfree(ndev);
380 return ERR_PTR(err);
381 }
382
383 if (snmp6_register_dev(ndev) < 0) {
384 ADBG(KERN_WARNING
385 "%s: cannot create /proc/net/dev_snmp6/%s\n",
386 __func__, dev->name);
387 goto err_release;
388 }
389
390 /* One reference from device. We must do this before
391 * we invoke __ipv6_regen_rndid().
392 */
393 in6_dev_hold(ndev);
394
395 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
396 ndev->cnf.accept_dad = -1;
397
398#if IS_ENABLED(CONFIG_IPV6_SIT)
399 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
400 pr_info("%s: Disabled Multicast RS\n", dev->name);
401 ndev->cnf.rtr_solicits = 0;
402 }
403#endif
404
405 INIT_LIST_HEAD(&ndev->tempaddr_list);
406 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
407 if ((dev->flags&IFF_LOOPBACK) ||
408 dev->type == ARPHRD_TUNNEL ||
409 dev->type == ARPHRD_TUNNEL6 ||
410 dev->type == ARPHRD_SIT ||
411 dev->type == ARPHRD_NONE) {
412 ndev->cnf.use_tempaddr = -1;
413 } else {
414 in6_dev_hold(ndev);
415 ipv6_regen_rndid((unsigned long) ndev);
416 }
417
418 ndev->token = in6addr_any;
419
420 if (netif_running(dev) && addrconf_qdisc_ok(dev))
421 ndev->if_flags |= IF_READY;
422
423 ipv6_mc_init_dev(ndev);
424 ndev->tstamp = jiffies;
425 err = addrconf_sysctl_register(ndev);
426 if (err) {
427 ipv6_mc_destroy_dev(ndev);
428 del_timer(&ndev->regen_timer);
429 snmp6_unregister_dev(ndev);
430 goto err_release;
431 }
432 /* protected by rtnl_lock */
433 rcu_assign_pointer(dev->ip6_ptr, ndev);
434
435 /* Join interface-local all-node multicast group */
436 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
437
438 /* Join all-node multicast group */
439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
440
441 /* Join all-router multicast group if forwarding is set */
442 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
443 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
444
445 return ndev;
446
447err_release:
448 neigh_parms_release(&nd_tbl, ndev->nd_parms);
449 ndev->dead = 1;
450 in6_dev_finish_destroy(ndev);
451 return ERR_PTR(err);
452}
453
454static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
455{
456 struct inet6_dev *idev;
457
458 ASSERT_RTNL();
459
460 idev = __in6_dev_get(dev);
461 if (!idev) {
462 idev = ipv6_add_dev(dev);
463 if (IS_ERR(idev))
464 return NULL;
465 }
466
467 if (dev->flags&IFF_UP)
468 ipv6_mc_up(idev);
469 return idev;
470}
471
472static int inet6_netconf_msgsize_devconf(int type)
473{
474 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
475 + nla_total_size(4); /* NETCONFA_IFINDEX */
476 bool all = false;
477
478 if (type == NETCONFA_ALL)
479 all = true;
480
481 if (all || type == NETCONFA_FORWARDING)
482 size += nla_total_size(4);
483#ifdef CONFIG_IPV6_MROUTE
484 if (all || type == NETCONFA_MC_FORWARDING)
485 size += nla_total_size(4);
486#endif
487 if (all || type == NETCONFA_PROXY_NEIGH)
488 size += nla_total_size(4);
489
490 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
491 size += nla_total_size(4);
492
493 return size;
494}
495
496static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
497 struct ipv6_devconf *devconf, u32 portid,
498 u32 seq, int event, unsigned int flags,
499 int type)
500{
501 struct nlmsghdr *nlh;
502 struct netconfmsg *ncm;
503 bool all = false;
504
505 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
506 flags);
507 if (!nlh)
508 return -EMSGSIZE;
509
510 if (type == NETCONFA_ALL)
511 all = true;
512
513 ncm = nlmsg_data(nlh);
514 ncm->ncm_family = AF_INET6;
515
516 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
517 goto nla_put_failure;
518
519 if ((all || type == NETCONFA_FORWARDING) &&
520 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
521 goto nla_put_failure;
522#ifdef CONFIG_IPV6_MROUTE
523 if ((all || type == NETCONFA_MC_FORWARDING) &&
524 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
525 devconf->mc_forwarding) < 0)
526 goto nla_put_failure;
527#endif
528 if ((all || type == NETCONFA_PROXY_NEIGH) &&
529 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
530 goto nla_put_failure;
531
532 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
533 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
534 devconf->ignore_routes_with_linkdown) < 0)
535 goto nla_put_failure;
536
537 nlmsg_end(skb, nlh);
538 return 0;
539
540nla_put_failure:
541 nlmsg_cancel(skb, nlh);
542 return -EMSGSIZE;
543}
544
545void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
546 struct ipv6_devconf *devconf)
547{
548 struct sk_buff *skb;
549 int err = -ENOBUFS;
550
551 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
552 if (!skb)
553 goto errout;
554
555 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
556 RTM_NEWNETCONF, 0, type);
557 if (err < 0) {
558 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
559 WARN_ON(err == -EMSGSIZE);
560 kfree_skb(skb);
561 goto errout;
562 }
563 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
564 return;
565errout:
566 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
567}
568
569static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
570 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
571 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
572 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
573 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
574};
575
576static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
577 struct nlmsghdr *nlh)
578{
579 struct net *net = sock_net(in_skb->sk);
580 struct nlattr *tb[NETCONFA_MAX+1];
581 struct netconfmsg *ncm;
582 struct sk_buff *skb;
583 struct ipv6_devconf *devconf;
584 struct inet6_dev *in6_dev;
585 struct net_device *dev;
586 int ifindex;
587 int err;
588
589 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
590 devconf_ipv6_policy);
591 if (err < 0)
592 goto errout;
593
594 err = -EINVAL;
595 if (!tb[NETCONFA_IFINDEX])
596 goto errout;
597
598 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
599 switch (ifindex) {
600 case NETCONFA_IFINDEX_ALL:
601 devconf = net->ipv6.devconf_all;
602 break;
603 case NETCONFA_IFINDEX_DEFAULT:
604 devconf = net->ipv6.devconf_dflt;
605 break;
606 default:
607 dev = __dev_get_by_index(net, ifindex);
608 if (!dev)
609 goto errout;
610 in6_dev = __in6_dev_get(dev);
611 if (!in6_dev)
612 goto errout;
613 devconf = &in6_dev->cnf;
614 break;
615 }
616
617 err = -ENOBUFS;
618 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
619 if (!skb)
620 goto errout;
621
622 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
623 NETLINK_CB(in_skb).portid,
624 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
625 NETCONFA_ALL);
626 if (err < 0) {
627 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
628 WARN_ON(err == -EMSGSIZE);
629 kfree_skb(skb);
630 goto errout;
631 }
632 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
633errout:
634 return err;
635}
636
637static int inet6_netconf_dump_devconf(struct sk_buff *skb,
638 struct netlink_callback *cb)
639{
640 struct net *net = sock_net(skb->sk);
641 int h, s_h;
642 int idx, s_idx;
643 struct net_device *dev;
644 struct inet6_dev *idev;
645 struct hlist_head *head;
646
647 s_h = cb->args[0];
648 s_idx = idx = cb->args[1];
649
650 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
651 idx = 0;
652 head = &net->dev_index_head[h];
653 rcu_read_lock();
654 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
655 net->dev_base_seq;
656 hlist_for_each_entry_rcu(dev, head, index_hlist) {
657 if (idx < s_idx)
658 goto cont;
659 idev = __in6_dev_get(dev);
660 if (!idev)
661 goto cont;
662
663 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
664 &idev->cnf,
665 NETLINK_CB(cb->skb).portid,
666 cb->nlh->nlmsg_seq,
667 RTM_NEWNETCONF,
668 NLM_F_MULTI,
669 NETCONFA_ALL) < 0) {
670 rcu_read_unlock();
671 goto done;
672 }
673 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
674cont:
675 idx++;
676 }
677 rcu_read_unlock();
678 }
679 if (h == NETDEV_HASHENTRIES) {
680 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
681 net->ipv6.devconf_all,
682 NETLINK_CB(cb->skb).portid,
683 cb->nlh->nlmsg_seq,
684 RTM_NEWNETCONF, NLM_F_MULTI,
685 NETCONFA_ALL) < 0)
686 goto done;
687 else
688 h++;
689 }
690 if (h == NETDEV_HASHENTRIES + 1) {
691 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
692 net->ipv6.devconf_dflt,
693 NETLINK_CB(cb->skb).portid,
694 cb->nlh->nlmsg_seq,
695 RTM_NEWNETCONF, NLM_F_MULTI,
696 NETCONFA_ALL) < 0)
697 goto done;
698 else
699 h++;
700 }
701done:
702 cb->args[0] = h;
703 cb->args[1] = idx;
704
705 return skb->len;
706}
707
708#ifdef CONFIG_SYSCTL
709static void dev_forward_change(struct inet6_dev *idev)
710{
711 struct net_device *dev;
712 struct inet6_ifaddr *ifa;
713
714 if (!idev)
715 return;
716 dev = idev->dev;
717 if (idev->cnf.forwarding)
718 dev_disable_lro(dev);
719 if (dev->flags & IFF_MULTICAST) {
720 if (idev->cnf.forwarding) {
721 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
722 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
723 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
724 } else {
725 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
726 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
727 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
728 }
729 }
730
731 list_for_each_entry(ifa, &idev->addr_list, if_list) {
732 if (ifa->flags&IFA_F_TENTATIVE)
733 continue;
734 if (idev->cnf.forwarding)
735 addrconf_join_anycast(ifa);
736 else
737 addrconf_leave_anycast(ifa);
738 }
739 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
740 dev->ifindex, &idev->cnf);
741}
742
743
744static void addrconf_forward_change(struct net *net, __s32 newf)
745{
746 struct net_device *dev;
747 struct inet6_dev *idev;
748
749 for_each_netdev(net, dev) {
750 idev = __in6_dev_get(dev);
751 if (idev) {
752 int changed = (!idev->cnf.forwarding) ^ (!newf);
753 idev->cnf.forwarding = newf;
754 if (changed)
755 dev_forward_change(idev);
756 }
757 }
758}
759
760static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
761{
762 struct net *net;
763 int old;
764
765 if (!rtnl_trylock())
766 return restart_syscall();
767
768 net = (struct net *)table->extra2;
769 old = *p;
770 *p = newf;
771
772 if (p == &net->ipv6.devconf_dflt->forwarding) {
773 if ((!newf) ^ (!old))
774 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
775 NETCONFA_IFINDEX_DEFAULT,
776 net->ipv6.devconf_dflt);
777 rtnl_unlock();
778 return 0;
779 }
780
781 if (p == &net->ipv6.devconf_all->forwarding) {
782 net->ipv6.devconf_dflt->forwarding = newf;
783 addrconf_forward_change(net, newf);
784 if ((!newf) ^ (!old))
785 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
786 NETCONFA_IFINDEX_ALL,
787 net->ipv6.devconf_all);
788 } else if ((!newf) ^ (!old))
789 dev_forward_change((struct inet6_dev *)table->extra1);
790 rtnl_unlock();
791
792 if (newf)
793 rt6_purge_dflt_routers(net);
794 return 1;
795}
796
797static void addrconf_linkdown_change(struct net *net, __s32 newf)
798{
799 struct net_device *dev;
800 struct inet6_dev *idev;
801
802 for_each_netdev(net, dev) {
803 idev = __in6_dev_get(dev);
804 if (idev) {
805 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
806
807 idev->cnf.ignore_routes_with_linkdown = newf;
808 if (changed)
809 inet6_netconf_notify_devconf(dev_net(dev),
810 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
811 dev->ifindex,
812 &idev->cnf);
813 }
814 }
815}
816
817static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
818{
819 struct net *net;
820 int old;
821
822 if (!rtnl_trylock())
823 return restart_syscall();
824
825 net = (struct net *)table->extra2;
826 old = *p;
827 *p = newf;
828
829 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
830 if ((!newf) ^ (!old))
831 inet6_netconf_notify_devconf(net,
832 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
833 NETCONFA_IFINDEX_DEFAULT,
834 net->ipv6.devconf_dflt);
835 rtnl_unlock();
836 return 0;
837 }
838
839 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
840 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
841 addrconf_linkdown_change(net, newf);
842 if ((!newf) ^ (!old))
843 inet6_netconf_notify_devconf(net,
844 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
845 NETCONFA_IFINDEX_ALL,
846 net->ipv6.devconf_all);
847 }
848 rtnl_unlock();
849
850 return 1;
851}
852
853#endif
854
855/* Nobody refers to this ifaddr, destroy it */
856void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
857{
858 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
859
860#ifdef NET_REFCNT_DEBUG
861 pr_debug("%s\n", __func__);
862#endif
863
864 in6_dev_put(ifp->idev);
865
866 if (cancel_delayed_work(&ifp->dad_work))
867 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
868 ifp);
869
870 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
871 pr_warn("Freeing alive inet6 address %p\n", ifp);
872 return;
873 }
874 ip6_rt_put(ifp->rt);
875
876 kfree_rcu(ifp, rcu);
877}
878
879static void
880ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
881{
882 struct list_head *p;
883 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
884
885 /*
886 * Each device address list is sorted in order of scope -
887 * global before linklocal.
888 */
889 list_for_each(p, &idev->addr_list) {
890 struct inet6_ifaddr *ifa
891 = list_entry(p, struct inet6_ifaddr, if_list);
892 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
893 break;
894 }
895
896 list_add_tail(&ifp->if_list, p);
897}
898
899static u32 inet6_addr_hash(const struct in6_addr *addr)
900{
901 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
902}
903
904/* On success it returns ifp with increased reference count */
905
906static struct inet6_ifaddr *
907ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
908 const struct in6_addr *peer_addr, int pfxlen,
909 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
910{
911 struct inet6_ifaddr *ifa = NULL;
912 struct rt6_info *rt;
913 unsigned int hash;
914 int err = 0;
915 int addr_type = ipv6_addr_type(addr);
916
917 if (addr_type == IPV6_ADDR_ANY ||
918 addr_type & IPV6_ADDR_MULTICAST ||
919 (!(idev->dev->flags & IFF_LOOPBACK) &&
920 addr_type & IPV6_ADDR_LOOPBACK))
921 return ERR_PTR(-EADDRNOTAVAIL);
922
923 rcu_read_lock_bh();
924 if (idev->dead) {
925 err = -ENODEV; /*XXX*/
926 goto out2;
927 }
928
929 if (idev->cnf.disable_ipv6) {
930 err = -EACCES;
931 goto out2;
932 }
933
934 spin_lock(&addrconf_hash_lock);
935
936 /* Ignore adding duplicate addresses on an interface */
937 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
938 ADBG("ipv6_add_addr: already assigned\n");
939 err = -EEXIST;
940 goto out;
941 }
942
943 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
944
945 if (!ifa) {
946 ADBG("ipv6_add_addr: malloc failed\n");
947 err = -ENOBUFS;
948 goto out;
949 }
950
951 rt = addrconf_dst_alloc(idev, addr, false);
952 if (IS_ERR(rt)) {
953 err = PTR_ERR(rt);
954 goto out;
955 }
956
957 neigh_parms_data_state_setall(idev->nd_parms);
958
959 ifa->addr = *addr;
960 if (peer_addr)
961 ifa->peer_addr = *peer_addr;
962
963 spin_lock_init(&ifa->lock);
964 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
965 INIT_HLIST_NODE(&ifa->addr_lst);
966 ifa->scope = scope;
967 ifa->prefix_len = pfxlen;
968 ifa->flags = flags | IFA_F_TENTATIVE;
969 ifa->valid_lft = valid_lft;
970 ifa->prefered_lft = prefered_lft;
971 ifa->cstamp = ifa->tstamp = jiffies;
972 ifa->tokenized = false;
973
974 ifa->rt = rt;
975
976 ifa->idev = idev;
977 in6_dev_hold(idev);
978 /* For caller */
979 in6_ifa_hold(ifa);
980
981 /* Add to big hash table */
982 hash = inet6_addr_hash(addr);
983
984 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
985 spin_unlock(&addrconf_hash_lock);
986
987 write_lock(&idev->lock);
988 /* Add to inet6_dev unicast addr list. */
989 ipv6_link_dev_addr(idev, ifa);
990
991 if (ifa->flags&IFA_F_TEMPORARY) {
992 list_add(&ifa->tmp_list, &idev->tempaddr_list);
993 in6_ifa_hold(ifa);
994 }
995
996 in6_ifa_hold(ifa);
997 write_unlock(&idev->lock);
998out2:
999 rcu_read_unlock_bh();
1000
1001 if (likely(err == 0))
1002 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1003 else {
1004 kfree(ifa);
1005 ifa = ERR_PTR(err);
1006 }
1007
1008 return ifa;
1009out:
1010 spin_unlock(&addrconf_hash_lock);
1011 goto out2;
1012}
1013
1014enum cleanup_prefix_rt_t {
1015 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1016 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1017 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1018};
1019
1020/*
1021 * Check, whether the prefix for ifp would still need a prefix route
1022 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1023 * constants.
1024 *
1025 * 1) we don't purge prefix if address was not permanent.
1026 * prefix is managed by its own lifetime.
1027 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1028 * 3) if there are no addresses, delete prefix.
1029 * 4) if there are still other permanent address(es),
1030 * corresponding prefix is still permanent.
1031 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1032 * don't purge the prefix, assume user space is managing it.
1033 * 6) otherwise, update prefix lifetime to the
1034 * longest valid lifetime among the corresponding
1035 * addresses on the device.
1036 * Note: subsequent RA will update lifetime.
1037 **/
1038static enum cleanup_prefix_rt_t
1039check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1040{
1041 struct inet6_ifaddr *ifa;
1042 struct inet6_dev *idev = ifp->idev;
1043 unsigned long lifetime;
1044 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1045
1046 *expires = jiffies;
1047
1048 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1049 if (ifa == ifp)
1050 continue;
1051 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1052 ifp->prefix_len))
1053 continue;
1054 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1055 return CLEANUP_PREFIX_RT_NOP;
1056
1057 action = CLEANUP_PREFIX_RT_EXPIRE;
1058
1059 spin_lock(&ifa->lock);
1060
1061 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1062 /*
1063 * Note: Because this address is
1064 * not permanent, lifetime <
1065 * LONG_MAX / HZ here.
1066 */
1067 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1068 *expires = ifa->tstamp + lifetime * HZ;
1069 spin_unlock(&ifa->lock);
1070 }
1071
1072 return action;
1073}
1074
1075static void
1076cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1077{
1078 struct rt6_info *rt;
1079
1080 rt = addrconf_get_prefix_route(&ifp->addr,
1081 ifp->prefix_len,
1082 ifp->idev->dev,
1083 0, RTF_GATEWAY | RTF_DEFAULT);
1084 if (rt) {
1085 if (del_rt)
1086 ip6_del_rt(rt);
1087 else {
1088 if (!(rt->rt6i_flags & RTF_EXPIRES))
1089 rt6_set_expires(rt, expires);
1090 ip6_rt_put(rt);
1091 }
1092 }
1093}
1094
1095
1096/* This function wants to get referenced ifp and releases it before return */
1097
1098static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1099{
1100 int state;
1101 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1102 unsigned long expires;
1103
1104 ASSERT_RTNL();
1105
1106 spin_lock_bh(&ifp->lock);
1107 state = ifp->state;
1108 ifp->state = INET6_IFADDR_STATE_DEAD;
1109 spin_unlock_bh(&ifp->lock);
1110
1111 if (state == INET6_IFADDR_STATE_DEAD)
1112 goto out;
1113
1114 spin_lock_bh(&addrconf_hash_lock);
1115 hlist_del_init_rcu(&ifp->addr_lst);
1116 spin_unlock_bh(&addrconf_hash_lock);
1117
1118 write_lock_bh(&ifp->idev->lock);
1119
1120 if (ifp->flags&IFA_F_TEMPORARY) {
1121 list_del(&ifp->tmp_list);
1122 if (ifp->ifpub) {
1123 in6_ifa_put(ifp->ifpub);
1124 ifp->ifpub = NULL;
1125 }
1126 __in6_ifa_put(ifp);
1127 }
1128
1129 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1130 action = check_cleanup_prefix_route(ifp, &expires);
1131
1132 list_del_init(&ifp->if_list);
1133 __in6_ifa_put(ifp);
1134
1135 write_unlock_bh(&ifp->idev->lock);
1136
1137 addrconf_del_dad_work(ifp);
1138
1139 ipv6_ifa_notify(RTM_DELADDR, ifp);
1140
1141 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1142
1143 if (action != CLEANUP_PREFIX_RT_NOP) {
1144 cleanup_prefix_route(ifp, expires,
1145 action == CLEANUP_PREFIX_RT_DEL);
1146 }
1147
1148 /* clean up prefsrc entries */
1149 rt6_remove_prefsrc(ifp);
1150out:
1151 in6_ifa_put(ifp);
1152}
1153
1154static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1155{
1156 struct inet6_dev *idev = ifp->idev;
1157 struct in6_addr addr, *tmpaddr;
1158 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1159 unsigned long regen_advance;
1160 int tmp_plen;
1161 int ret = 0;
1162 u32 addr_flags;
1163 unsigned long now = jiffies;
1164
1165 write_lock_bh(&idev->lock);
1166 if (ift) {
1167 spin_lock_bh(&ift->lock);
1168 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1169 spin_unlock_bh(&ift->lock);
1170 tmpaddr = &addr;
1171 } else {
1172 tmpaddr = NULL;
1173 }
1174retry:
1175 in6_dev_hold(idev);
1176 if (idev->cnf.use_tempaddr <= 0) {
1177 write_unlock_bh(&idev->lock);
1178 pr_info("%s: use_tempaddr is disabled\n", __func__);
1179 in6_dev_put(idev);
1180 ret = -1;
1181 goto out;
1182 }
1183 spin_lock_bh(&ifp->lock);
1184 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1185 idev->cnf.use_tempaddr = -1; /*XXX*/
1186 spin_unlock_bh(&ifp->lock);
1187 write_unlock_bh(&idev->lock);
1188 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1189 __func__);
1190 in6_dev_put(idev);
1191 ret = -1;
1192 goto out;
1193 }
1194 in6_ifa_hold(ifp);
1195 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1196 __ipv6_try_regen_rndid(idev, tmpaddr);
1197 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1198 age = (now - ifp->tstamp) / HZ;
1199 tmp_valid_lft = min_t(__u32,
1200 ifp->valid_lft,
1201 idev->cnf.temp_valid_lft + age);
1202 tmp_prefered_lft = min_t(__u32,
1203 ifp->prefered_lft,
1204 idev->cnf.temp_prefered_lft + age -
1205 idev->cnf.max_desync_factor);
1206 tmp_plen = ifp->prefix_len;
1207 tmp_tstamp = ifp->tstamp;
1208 spin_unlock_bh(&ifp->lock);
1209
1210 regen_advance = idev->cnf.regen_max_retry *
1211 idev->cnf.dad_transmits *
1212 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1213 write_unlock_bh(&idev->lock);
1214
1215 /* A temporary address is created only if this calculated Preferred
1216 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1217 * an implementation must not create a temporary address with a zero
1218 * Preferred Lifetime.
1219 * Use age calculation as in addrconf_verify to avoid unnecessary
1220 * temporary addresses being generated.
1221 */
1222 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1223 if (tmp_prefered_lft <= regen_advance + age) {
1224 in6_ifa_put(ifp);
1225 in6_dev_put(idev);
1226 ret = -1;
1227 goto out;
1228 }
1229
1230 addr_flags = IFA_F_TEMPORARY;
1231 /* set in addrconf_prefix_rcv() */
1232 if (ifp->flags & IFA_F_OPTIMISTIC)
1233 addr_flags |= IFA_F_OPTIMISTIC;
1234
1235 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1236 ipv6_addr_scope(&addr), addr_flags,
1237 tmp_valid_lft, tmp_prefered_lft);
1238 if (IS_ERR(ift)) {
1239 in6_ifa_put(ifp);
1240 in6_dev_put(idev);
1241 pr_info("%s: retry temporary address regeneration\n", __func__);
1242 tmpaddr = &addr;
1243 write_lock_bh(&idev->lock);
1244 goto retry;
1245 }
1246
1247 spin_lock_bh(&ift->lock);
1248 ift->ifpub = ifp;
1249 ift->cstamp = now;
1250 ift->tstamp = tmp_tstamp;
1251 spin_unlock_bh(&ift->lock);
1252
1253 addrconf_dad_start(ift);
1254 in6_ifa_put(ift);
1255 in6_dev_put(idev);
1256out:
1257 return ret;
1258}
1259
1260/*
1261 * Choose an appropriate source address (RFC3484)
1262 */
1263enum {
1264 IPV6_SADDR_RULE_INIT = 0,
1265 IPV6_SADDR_RULE_LOCAL,
1266 IPV6_SADDR_RULE_SCOPE,
1267 IPV6_SADDR_RULE_PREFERRED,
1268#ifdef CONFIG_IPV6_MIP6
1269 IPV6_SADDR_RULE_HOA,
1270#endif
1271 IPV6_SADDR_RULE_OIF,
1272 IPV6_SADDR_RULE_LABEL,
1273 IPV6_SADDR_RULE_PRIVACY,
1274 IPV6_SADDR_RULE_ORCHID,
1275 IPV6_SADDR_RULE_PREFIX,
1276#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1277 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1278#endif
1279 IPV6_SADDR_RULE_MAX
1280};
1281
1282struct ipv6_saddr_score {
1283 int rule;
1284 int addr_type;
1285 struct inet6_ifaddr *ifa;
1286 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1287 int scopedist;
1288 int matchlen;
1289};
1290
1291struct ipv6_saddr_dst {
1292 const struct in6_addr *addr;
1293 int ifindex;
1294 int scope;
1295 int label;
1296 unsigned int prefs;
1297};
1298
1299static inline int ipv6_saddr_preferred(int type)
1300{
1301 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1302 return 1;
1303 return 0;
1304}
1305
1306static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1307{
1308#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1309 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1310#else
1311 return false;
1312#endif
1313}
1314
1315static int ipv6_get_saddr_eval(struct net *net,
1316 struct ipv6_saddr_score *score,
1317 struct ipv6_saddr_dst *dst,
1318 int i)
1319{
1320 int ret;
1321
1322 if (i <= score->rule) {
1323 switch (i) {
1324 case IPV6_SADDR_RULE_SCOPE:
1325 ret = score->scopedist;
1326 break;
1327 case IPV6_SADDR_RULE_PREFIX:
1328 ret = score->matchlen;
1329 break;
1330 default:
1331 ret = !!test_bit(i, score->scorebits);
1332 }
1333 goto out;
1334 }
1335
1336 switch (i) {
1337 case IPV6_SADDR_RULE_INIT:
1338 /* Rule 0: remember if hiscore is not ready yet */
1339 ret = !!score->ifa;
1340 break;
1341 case IPV6_SADDR_RULE_LOCAL:
1342 /* Rule 1: Prefer same address */
1343 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1344 break;
1345 case IPV6_SADDR_RULE_SCOPE:
1346 /* Rule 2: Prefer appropriate scope
1347 *
1348 * ret
1349 * ^
1350 * -1 | d 15
1351 * ---+--+-+---> scope
1352 * |
1353 * | d is scope of the destination.
1354 * B-d | \
1355 * | \ <- smaller scope is better if
1356 * B-15 | \ if scope is enough for destination.
1357 * | ret = B - scope (-1 <= scope >= d <= 15).
1358 * d-C-1 | /
1359 * |/ <- greater is better
1360 * -C / if scope is not enough for destination.
1361 * /| ret = scope - C (-1 <= d < scope <= 15).
1362 *
1363 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1364 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1365 * Assume B = 0 and we get C > 29.
1366 */
1367 ret = __ipv6_addr_src_scope(score->addr_type);
1368 if (ret >= dst->scope)
1369 ret = -ret;
1370 else
1371 ret -= 128; /* 30 is enough */
1372 score->scopedist = ret;
1373 break;
1374 case IPV6_SADDR_RULE_PREFERRED:
1375 {
1376 /* Rule 3: Avoid deprecated and optimistic addresses */
1377 u8 avoid = IFA_F_DEPRECATED;
1378
1379 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1380 avoid |= IFA_F_OPTIMISTIC;
1381 ret = ipv6_saddr_preferred(score->addr_type) ||
1382 !(score->ifa->flags & avoid);
1383 break;
1384 }
1385#ifdef CONFIG_IPV6_MIP6
1386 case IPV6_SADDR_RULE_HOA:
1387 {
1388 /* Rule 4: Prefer home address */
1389 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1390 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1391 break;
1392 }
1393#endif
1394 case IPV6_SADDR_RULE_OIF:
1395 /* Rule 5: Prefer outgoing interface */
1396 ret = (!dst->ifindex ||
1397 dst->ifindex == score->ifa->idev->dev->ifindex);
1398 break;
1399 case IPV6_SADDR_RULE_LABEL:
1400 /* Rule 6: Prefer matching label */
1401 ret = ipv6_addr_label(net,
1402 &score->ifa->addr, score->addr_type,
1403 score->ifa->idev->dev->ifindex) == dst->label;
1404 break;
1405 case IPV6_SADDR_RULE_PRIVACY:
1406 {
1407 /* Rule 7: Prefer public address
1408 * Note: prefer temporary address if use_tempaddr >= 2
1409 */
1410 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1411 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1412 score->ifa->idev->cnf.use_tempaddr >= 2;
1413 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1414 break;
1415 }
1416 case IPV6_SADDR_RULE_ORCHID:
1417 /* Rule 8-: Prefer ORCHID vs ORCHID or
1418 * non-ORCHID vs non-ORCHID
1419 */
1420 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1421 ipv6_addr_orchid(dst->addr));
1422 break;
1423 case IPV6_SADDR_RULE_PREFIX:
1424 /* Rule 8: Use longest matching prefix */
1425 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1426 if (ret > score->ifa->prefix_len)
1427 ret = score->ifa->prefix_len;
1428 score->matchlen = ret;
1429 break;
1430#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1431 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1432 /* Optimistic addresses still have lower precedence than other
1433 * preferred addresses.
1434 */
1435 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1436 break;
1437#endif
1438 default:
1439 ret = 0;
1440 }
1441
1442 if (ret)
1443 __set_bit(i, score->scorebits);
1444 score->rule = i;
1445out:
1446 return ret;
1447}
1448
1449static int __ipv6_dev_get_saddr(struct net *net,
1450 struct ipv6_saddr_dst *dst,
1451 struct inet6_dev *idev,
1452 struct ipv6_saddr_score *scores,
1453 int hiscore_idx)
1454{
1455 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1456
1457 read_lock_bh(&idev->lock);
1458 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1459 int i;
1460
1461 /*
1462 * - Tentative Address (RFC2462 section 5.4)
1463 * - A tentative address is not considered
1464 * "assigned to an interface" in the traditional
1465 * sense, unless it is also flagged as optimistic.
1466 * - Candidate Source Address (section 4)
1467 * - In any case, anycast addresses, multicast
1468 * addresses, and the unspecified address MUST
1469 * NOT be included in a candidate set.
1470 */
1471 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1472 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1473 continue;
1474
1475 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1476
1477 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1478 score->addr_type & IPV6_ADDR_MULTICAST)) {
1479 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1480 idev->dev->name);
1481 continue;
1482 }
1483
1484 score->rule = -1;
1485 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1486
1487 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1488 int minihiscore, miniscore;
1489
1490 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1491 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1492
1493 if (minihiscore > miniscore) {
1494 if (i == IPV6_SADDR_RULE_SCOPE &&
1495 score->scopedist > 0) {
1496 /*
1497 * special case:
1498 * each remaining entry
1499 * has too small (not enough)
1500 * scope, because ifa entries
1501 * are sorted by their scope
1502 * values.
1503 */
1504 goto out;
1505 }
1506 break;
1507 } else if (minihiscore < miniscore) {
1508 if (hiscore->ifa)
1509 in6_ifa_put(hiscore->ifa);
1510
1511 in6_ifa_hold(score->ifa);
1512
1513 swap(hiscore, score);
1514 hiscore_idx = 1 - hiscore_idx;
1515
1516 /* restore our iterator */
1517 score->ifa = hiscore->ifa;
1518
1519 break;
1520 }
1521 }
1522 }
1523out:
1524 read_unlock_bh(&idev->lock);
1525 return hiscore_idx;
1526}
1527
1528int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1529 const struct in6_addr *daddr, unsigned int prefs,
1530 struct in6_addr *saddr)
1531{
1532 struct ipv6_saddr_score scores[2], *hiscore;
1533 struct ipv6_saddr_dst dst;
1534 struct inet6_dev *idev;
1535 struct net_device *dev;
1536 int dst_type;
1537 bool use_oif_addr = false;
1538 int hiscore_idx = 0;
1539
1540 dst_type = __ipv6_addr_type(daddr);
1541 dst.addr = daddr;
1542 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1543 dst.scope = __ipv6_addr_src_scope(dst_type);
1544 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1545 dst.prefs = prefs;
1546
1547 scores[hiscore_idx].rule = -1;
1548 scores[hiscore_idx].ifa = NULL;
1549
1550 rcu_read_lock();
1551
1552 /* Candidate Source Address (section 4)
1553 * - multicast and link-local destination address,
1554 * the set of candidate source address MUST only
1555 * include addresses assigned to interfaces
1556 * belonging to the same link as the outgoing
1557 * interface.
1558 * (- For site-local destination addresses, the
1559 * set of candidate source addresses MUST only
1560 * include addresses assigned to interfaces
1561 * belonging to the same site as the outgoing
1562 * interface.)
1563 * - "It is RECOMMENDED that the candidate source addresses
1564 * be the set of unicast addresses assigned to the
1565 * interface that will be used to send to the destination
1566 * (the 'outgoing' interface)." (RFC 6724)
1567 */
1568 if (dst_dev) {
1569 idev = __in6_dev_get(dst_dev);
1570 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1571 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1572 (idev && idev->cnf.use_oif_addrs_only)) {
1573 use_oif_addr = true;
1574 }
1575 }
1576
1577 if (use_oif_addr) {
1578 if (idev)
1579 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1580 } else {
1581 for_each_netdev_rcu(net, dev) {
1582 idev = __in6_dev_get(dev);
1583 if (!idev)
1584 continue;
1585 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1586 }
1587 }
1588 rcu_read_unlock();
1589
1590 hiscore = &scores[hiscore_idx];
1591 if (!hiscore->ifa)
1592 return -EADDRNOTAVAIL;
1593
1594 *saddr = hiscore->ifa->addr;
1595 in6_ifa_put(hiscore->ifa);
1596 return 0;
1597}
1598EXPORT_SYMBOL(ipv6_dev_get_saddr);
1599
1600int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1601 u32 banned_flags)
1602{
1603 struct inet6_ifaddr *ifp;
1604 int err = -EADDRNOTAVAIL;
1605
1606 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1607 if (ifp->scope > IFA_LINK)
1608 break;
1609 if (ifp->scope == IFA_LINK &&
1610 !(ifp->flags & banned_flags)) {
1611 *addr = ifp->addr;
1612 err = 0;
1613 break;
1614 }
1615 }
1616 return err;
1617}
1618
1619int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1620 u32 banned_flags)
1621{
1622 struct inet6_dev *idev;
1623 int err = -EADDRNOTAVAIL;
1624
1625 rcu_read_lock();
1626 idev = __in6_dev_get(dev);
1627 if (idev) {
1628 read_lock_bh(&idev->lock);
1629 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1630 read_unlock_bh(&idev->lock);
1631 }
1632 rcu_read_unlock();
1633 return err;
1634}
1635
1636static int ipv6_count_addresses(struct inet6_dev *idev)
1637{
1638 int cnt = 0;
1639 struct inet6_ifaddr *ifp;
1640
1641 read_lock_bh(&idev->lock);
1642 list_for_each_entry(ifp, &idev->addr_list, if_list)
1643 cnt++;
1644 read_unlock_bh(&idev->lock);
1645 return cnt;
1646}
1647
1648int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1649 const struct net_device *dev, int strict)
1650{
1651 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1652}
1653EXPORT_SYMBOL(ipv6_chk_addr);
1654
1655int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1656 const struct net_device *dev, int strict,
1657 u32 banned_flags)
1658{
1659 struct inet6_ifaddr *ifp;
1660 unsigned int hash = inet6_addr_hash(addr);
1661 u32 ifp_flags;
1662
1663 rcu_read_lock_bh();
1664 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1665 if (!net_eq(dev_net(ifp->idev->dev), net))
1666 continue;
1667 /* Decouple optimistic from tentative for evaluation here.
1668 * Ban optimistic addresses explicitly, when required.
1669 */
1670 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1671 ? (ifp->flags&~IFA_F_TENTATIVE)
1672 : ifp->flags;
1673 if (ipv6_addr_equal(&ifp->addr, addr) &&
1674 !(ifp_flags&banned_flags) &&
1675 (!dev || ifp->idev->dev == dev ||
1676 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1677 rcu_read_unlock_bh();
1678 return 1;
1679 }
1680 }
1681
1682 rcu_read_unlock_bh();
1683 return 0;
1684}
1685EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1686
1687static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1688 struct net_device *dev)
1689{
1690 unsigned int hash = inet6_addr_hash(addr);
1691 struct inet6_ifaddr *ifp;
1692
1693 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1694 if (!net_eq(dev_net(ifp->idev->dev), net))
1695 continue;
1696 if (ipv6_addr_equal(&ifp->addr, addr)) {
1697 if (!dev || ifp->idev->dev == dev)
1698 return true;
1699 }
1700 }
1701 return false;
1702}
1703
1704/* Compares an address/prefix_len with addresses on device @dev.
1705 * If one is found it returns true.
1706 */
1707bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1708 const unsigned int prefix_len, struct net_device *dev)
1709{
1710 struct inet6_dev *idev;
1711 struct inet6_ifaddr *ifa;
1712 bool ret = false;
1713
1714 rcu_read_lock();
1715 idev = __in6_dev_get(dev);
1716 if (idev) {
1717 read_lock_bh(&idev->lock);
1718 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1719 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1720 if (ret)
1721 break;
1722 }
1723 read_unlock_bh(&idev->lock);
1724 }
1725 rcu_read_unlock();
1726
1727 return ret;
1728}
1729EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1730
1731int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1732{
1733 struct inet6_dev *idev;
1734 struct inet6_ifaddr *ifa;
1735 int onlink;
1736
1737 onlink = 0;
1738 rcu_read_lock();
1739 idev = __in6_dev_get(dev);
1740 if (idev) {
1741 read_lock_bh(&idev->lock);
1742 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1743 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1744 ifa->prefix_len);
1745 if (onlink)
1746 break;
1747 }
1748 read_unlock_bh(&idev->lock);
1749 }
1750 rcu_read_unlock();
1751 return onlink;
1752}
1753EXPORT_SYMBOL(ipv6_chk_prefix);
1754
1755struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1756 struct net_device *dev, int strict)
1757{
1758 struct inet6_ifaddr *ifp, *result = NULL;
1759 unsigned int hash = inet6_addr_hash(addr);
1760
1761 rcu_read_lock_bh();
1762 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1763 if (!net_eq(dev_net(ifp->idev->dev), net))
1764 continue;
1765 if (ipv6_addr_equal(&ifp->addr, addr)) {
1766 if (!dev || ifp->idev->dev == dev ||
1767 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1768 result = ifp;
1769 in6_ifa_hold(ifp);
1770 break;
1771 }
1772 }
1773 }
1774 rcu_read_unlock_bh();
1775
1776 return result;
1777}
1778
1779/* Gets referenced address, destroys ifaddr */
1780
1781static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1782{
1783 if (dad_failed)
1784 ifp->flags |= IFA_F_DADFAILED;
1785
1786 if (ifp->flags&IFA_F_PERMANENT) {
1787 spin_lock_bh(&ifp->lock);
1788 addrconf_del_dad_work(ifp);
1789 ifp->flags |= IFA_F_TENTATIVE;
1790 spin_unlock_bh(&ifp->lock);
1791 if (dad_failed)
1792 ipv6_ifa_notify(0, ifp);
1793 in6_ifa_put(ifp);
1794 } else if (ifp->flags&IFA_F_TEMPORARY) {
1795 struct inet6_ifaddr *ifpub;
1796 spin_lock_bh(&ifp->lock);
1797 ifpub = ifp->ifpub;
1798 if (ifpub) {
1799 in6_ifa_hold(ifpub);
1800 spin_unlock_bh(&ifp->lock);
1801 ipv6_create_tempaddr(ifpub, ifp);
1802 in6_ifa_put(ifpub);
1803 } else {
1804 spin_unlock_bh(&ifp->lock);
1805 }
1806 ipv6_del_addr(ifp);
1807 } else {
1808 ipv6_del_addr(ifp);
1809 }
1810}
1811
1812static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1813{
1814 int err = -ENOENT;
1815
1816 spin_lock_bh(&ifp->lock);
1817 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1818 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1819 err = 0;
1820 }
1821 spin_unlock_bh(&ifp->lock);
1822
1823 return err;
1824}
1825
1826void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1827{
1828 struct in6_addr addr;
1829 struct inet6_dev *idev = ifp->idev;
1830 struct net *net = dev_net(ifp->idev->dev);
1831
1832 if (addrconf_dad_end(ifp)) {
1833 in6_ifa_put(ifp);
1834 return;
1835 }
1836
1837 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1838 ifp->idev->dev->name, &ifp->addr);
1839
1840 spin_lock_bh(&ifp->lock);
1841
1842 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1843 int scope = ifp->scope;
1844 u32 flags = ifp->flags;
1845 struct in6_addr new_addr;
1846 struct inet6_ifaddr *ifp2;
1847 u32 valid_lft, preferred_lft;
1848 int pfxlen = ifp->prefix_len;
1849 int retries = ifp->stable_privacy_retry + 1;
1850
1851 if (retries > net->ipv6.sysctl.idgen_retries) {
1852 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1853 ifp->idev->dev->name);
1854 goto errdad;
1855 }
1856
1857 new_addr = ifp->addr;
1858 if (ipv6_generate_stable_address(&new_addr, retries,
1859 idev))
1860 goto errdad;
1861
1862 valid_lft = ifp->valid_lft;
1863 preferred_lft = ifp->prefered_lft;
1864
1865 spin_unlock_bh(&ifp->lock);
1866
1867 if (idev->cnf.max_addresses &&
1868 ipv6_count_addresses(idev) >=
1869 idev->cnf.max_addresses)
1870 goto lock_errdad;
1871
1872 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1873 ifp->idev->dev->name);
1874
1875 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1876 scope, flags, valid_lft,
1877 preferred_lft);
1878 if (IS_ERR(ifp2))
1879 goto lock_errdad;
1880
1881 spin_lock_bh(&ifp2->lock);
1882 ifp2->stable_privacy_retry = retries;
1883 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1884 spin_unlock_bh(&ifp2->lock);
1885
1886 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1887 in6_ifa_put(ifp2);
1888lock_errdad:
1889 spin_lock_bh(&ifp->lock);
1890 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1891 addr.s6_addr32[0] = htonl(0xfe800000);
1892 addr.s6_addr32[1] = 0;
1893
1894 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1895 ipv6_addr_equal(&ifp->addr, &addr)) {
1896 /* DAD failed for link-local based on MAC address */
1897 idev->cnf.disable_ipv6 = 1;
1898
1899 pr_info("%s: IPv6 being disabled!\n",
1900 ifp->idev->dev->name);
1901 }
1902 }
1903
1904errdad:
1905 /* transition from _POSTDAD to _ERRDAD */
1906 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1907 spin_unlock_bh(&ifp->lock);
1908
1909 addrconf_mod_dad_work(ifp, 0);
1910}
1911
1912/* Join to solicited addr multicast group.
1913 * caller must hold RTNL */
1914void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1915{
1916 struct in6_addr maddr;
1917
1918 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1919 return;
1920
1921 addrconf_addr_solict_mult(addr, &maddr);
1922 ipv6_dev_mc_inc(dev, &maddr);
1923}
1924
1925/* caller must hold RTNL */
1926void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1927{
1928 struct in6_addr maddr;
1929
1930 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1931 return;
1932
1933 addrconf_addr_solict_mult(addr, &maddr);
1934 __ipv6_dev_mc_dec(idev, &maddr);
1935}
1936
1937/* caller must hold RTNL */
1938static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1939{
1940 struct in6_addr addr;
1941
1942 if (ifp->prefix_len >= 127) /* RFC 6164 */
1943 return;
1944 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1945 if (ipv6_addr_any(&addr))
1946 return;
1947 __ipv6_dev_ac_inc(ifp->idev, &addr);
1948}
1949
1950/* caller must hold RTNL */
1951static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1952{
1953 struct in6_addr addr;
1954
1955 if (ifp->prefix_len >= 127) /* RFC 6164 */
1956 return;
1957 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1958 if (ipv6_addr_any(&addr))
1959 return;
1960 __ipv6_dev_ac_dec(ifp->idev, &addr);
1961}
1962
1963static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1964{
1965 if (dev->addr_len != EUI64_ADDR_LEN)
1966 return -1;
1967 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
1968 eui[0] ^= 2;
1969 return 0;
1970}
1971
1972static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1973{
1974 union fwnet_hwaddr *ha;
1975
1976 if (dev->addr_len != FWNET_ALEN)
1977 return -1;
1978
1979 ha = (union fwnet_hwaddr *)dev->dev_addr;
1980
1981 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1982 eui[0] ^= 2;
1983 return 0;
1984}
1985
1986static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1987{
1988 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1989 if (dev->addr_len != ARCNET_ALEN)
1990 return -1;
1991 memset(eui, 0, 7);
1992 eui[7] = *(u8 *)dev->dev_addr;
1993 return 0;
1994}
1995
1996static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1997{
1998 if (dev->addr_len != INFINIBAND_ALEN)
1999 return -1;
2000 memcpy(eui, dev->dev_addr + 12, 8);
2001 eui[0] |= 2;
2002 return 0;
2003}
2004
2005static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2006{
2007 if (addr == 0)
2008 return -1;
2009 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2010 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2011 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2012 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2013 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2014 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2015 eui[1] = 0;
2016 eui[2] = 0x5E;
2017 eui[3] = 0xFE;
2018 memcpy(eui + 4, &addr, 4);
2019 return 0;
2020}
2021
2022static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2023{
2024 if (dev->priv_flags & IFF_ISATAP)
2025 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2026 return -1;
2027}
2028
2029static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2030{
2031 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2032}
2033
2034static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2035{
2036 memcpy(eui, dev->perm_addr, 3);
2037 memcpy(eui + 5, dev->perm_addr + 3, 3);
2038 eui[3] = 0xFF;
2039 eui[4] = 0xFE;
2040 eui[0] ^= 2;
2041 return 0;
2042}
2043
2044static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2045{
2046 switch (dev->type) {
2047 case ARPHRD_ETHER:
2048 case ARPHRD_FDDI:
2049 return addrconf_ifid_eui48(eui, dev);
2050 case ARPHRD_ARCNET:
2051 return addrconf_ifid_arcnet(eui, dev);
2052 case ARPHRD_INFINIBAND:
2053 return addrconf_ifid_infiniband(eui, dev);
2054 case ARPHRD_SIT:
2055 return addrconf_ifid_sit(eui, dev);
2056 case ARPHRD_IPGRE:
2057 return addrconf_ifid_gre(eui, dev);
2058 case ARPHRD_6LOWPAN:
2059 return addrconf_ifid_eui64(eui, dev);
2060 case ARPHRD_IEEE1394:
2061 return addrconf_ifid_ieee1394(eui, dev);
2062 case ARPHRD_TUNNEL6:
2063 return addrconf_ifid_ip6tnl(eui, dev);
2064 }
2065 return -1;
2066}
2067
2068static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2069{
2070 int err = -1;
2071 struct inet6_ifaddr *ifp;
2072
2073 read_lock_bh(&idev->lock);
2074 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2075 if (ifp->scope > IFA_LINK)
2076 break;
2077 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2078 memcpy(eui, ifp->addr.s6_addr+8, 8);
2079 err = 0;
2080 break;
2081 }
2082 }
2083 read_unlock_bh(&idev->lock);
2084 return err;
2085}
2086
2087/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2088static void __ipv6_regen_rndid(struct inet6_dev *idev)
2089{
2090regen:
2091 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2092 idev->rndid[0] &= ~0x02;
2093
2094 /*
2095 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2096 * check if generated address is not inappropriate
2097 *
2098 * - Reserved subnet anycast (RFC 2526)
2099 * 11111101 11....11 1xxxxxxx
2100 * - ISATAP (RFC4214) 6.1
2101 * 00-00-5E-FE-xx-xx-xx-xx
2102 * - value 0
2103 * - XXX: already assigned to an address on the device
2104 */
2105 if (idev->rndid[0] == 0xfd &&
2106 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2107 (idev->rndid[7]&0x80))
2108 goto regen;
2109 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2110 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2111 goto regen;
2112 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2113 goto regen;
2114 }
2115}
2116
2117static void ipv6_regen_rndid(unsigned long data)
2118{
2119 struct inet6_dev *idev = (struct inet6_dev *) data;
2120 unsigned long expires;
2121
2122 rcu_read_lock_bh();
2123 write_lock_bh(&idev->lock);
2124
2125 if (idev->dead)
2126 goto out;
2127
2128 __ipv6_regen_rndid(idev);
2129
2130 expires = jiffies +
2131 idev->cnf.temp_prefered_lft * HZ -
2132 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2133 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2134 idev->cnf.max_desync_factor * HZ;
2135 if (time_before(expires, jiffies)) {
2136 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2137 __func__, idev->dev->name);
2138 goto out;
2139 }
2140
2141 if (!mod_timer(&idev->regen_timer, expires))
2142 in6_dev_hold(idev);
2143
2144out:
2145 write_unlock_bh(&idev->lock);
2146 rcu_read_unlock_bh();
2147 in6_dev_put(idev);
2148}
2149
2150static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2151{
2152 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2153 __ipv6_regen_rndid(idev);
2154}
2155
2156/*
2157 * Add prefix route.
2158 */
2159
2160static void
2161addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2162 unsigned long expires, u32 flags)
2163{
2164 struct fib6_config cfg = {
2165 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2166 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2167 .fc_ifindex = dev->ifindex,
2168 .fc_expires = expires,
2169 .fc_dst_len = plen,
2170 .fc_flags = RTF_UP | flags,
2171 .fc_nlinfo.nl_net = dev_net(dev),
2172 .fc_protocol = RTPROT_KERNEL,
2173 };
2174
2175 cfg.fc_dst = *pfx;
2176
2177 /* Prevent useless cloning on PtP SIT.
2178 This thing is done here expecting that the whole
2179 class of non-broadcast devices need not cloning.
2180 */
2181#if IS_ENABLED(CONFIG_IPV6_SIT)
2182 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2183 cfg.fc_flags |= RTF_NONEXTHOP;
2184#endif
2185
2186 ip6_route_add(&cfg);
2187}
2188
2189
2190static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2191 int plen,
2192 const struct net_device *dev,
2193 u32 flags, u32 noflags)
2194{
2195 struct fib6_node *fn;
2196 struct rt6_info *rt = NULL;
2197 struct fib6_table *table;
2198 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2199
2200 table = fib6_get_table(dev_net(dev), tb_id);
2201 if (!table)
2202 return NULL;
2203
2204 read_lock_bh(&table->tb6_lock);
2205 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2206 if (!fn)
2207 goto out;
2208
2209 noflags |= RTF_CACHE;
2210 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2211 if (rt->dst.dev->ifindex != dev->ifindex)
2212 continue;
2213 if ((rt->rt6i_flags & flags) != flags)
2214 continue;
2215 if ((rt->rt6i_flags & noflags) != 0)
2216 continue;
2217 dst_hold(&rt->dst);
2218 break;
2219 }
2220out:
2221 read_unlock_bh(&table->tb6_lock);
2222 return rt;
2223}
2224
2225
2226/* Create "default" multicast route to the interface */
2227
2228static void addrconf_add_mroute(struct net_device *dev)
2229{
2230 struct fib6_config cfg = {
2231 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2232 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2233 .fc_ifindex = dev->ifindex,
2234 .fc_dst_len = 8,
2235 .fc_flags = RTF_UP,
2236 .fc_nlinfo.nl_net = dev_net(dev),
2237 };
2238
2239 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2240
2241 ip6_route_add(&cfg);
2242}
2243
2244static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2245{
2246 struct inet6_dev *idev;
2247
2248 ASSERT_RTNL();
2249
2250 idev = ipv6_find_idev(dev);
2251 if (!idev)
2252 return ERR_PTR(-ENOBUFS);
2253
2254 if (idev->cnf.disable_ipv6)
2255 return ERR_PTR(-EACCES);
2256
2257 /* Add default multicast route */
2258 if (!(dev->flags & IFF_LOOPBACK))
2259 addrconf_add_mroute(dev);
2260
2261 return idev;
2262}
2263
2264static void manage_tempaddrs(struct inet6_dev *idev,
2265 struct inet6_ifaddr *ifp,
2266 __u32 valid_lft, __u32 prefered_lft,
2267 bool create, unsigned long now)
2268{
2269 u32 flags;
2270 struct inet6_ifaddr *ift;
2271
2272 read_lock_bh(&idev->lock);
2273 /* update all temporary addresses in the list */
2274 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2275 int age, max_valid, max_prefered;
2276
2277 if (ifp != ift->ifpub)
2278 continue;
2279
2280 /* RFC 4941 section 3.3:
2281 * If a received option will extend the lifetime of a public
2282 * address, the lifetimes of temporary addresses should
2283 * be extended, subject to the overall constraint that no
2284 * temporary addresses should ever remain "valid" or "preferred"
2285 * for a time longer than (TEMP_VALID_LIFETIME) or
2286 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2287 */
2288 age = (now - ift->cstamp) / HZ;
2289 max_valid = idev->cnf.temp_valid_lft - age;
2290 if (max_valid < 0)
2291 max_valid = 0;
2292
2293 max_prefered = idev->cnf.temp_prefered_lft -
2294 idev->cnf.max_desync_factor - age;
2295 if (max_prefered < 0)
2296 max_prefered = 0;
2297
2298 if (valid_lft > max_valid)
2299 valid_lft = max_valid;
2300
2301 if (prefered_lft > max_prefered)
2302 prefered_lft = max_prefered;
2303
2304 spin_lock(&ift->lock);
2305 flags = ift->flags;
2306 ift->valid_lft = valid_lft;
2307 ift->prefered_lft = prefered_lft;
2308 ift->tstamp = now;
2309 if (prefered_lft > 0)
2310 ift->flags &= ~IFA_F_DEPRECATED;
2311
2312 spin_unlock(&ift->lock);
2313 if (!(flags&IFA_F_TENTATIVE))
2314 ipv6_ifa_notify(0, ift);
2315 }
2316
2317 if ((create || list_empty(&idev->tempaddr_list)) &&
2318 idev->cnf.use_tempaddr > 0) {
2319 /* When a new public address is created as described
2320 * in [ADDRCONF], also create a new temporary address.
2321 * Also create a temporary address if it's enabled but
2322 * no temporary address currently exists.
2323 */
2324 read_unlock_bh(&idev->lock);
2325 ipv6_create_tempaddr(ifp, NULL);
2326 } else {
2327 read_unlock_bh(&idev->lock);
2328 }
2329}
2330
2331static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2332{
2333 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2334 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2335}
2336
2337void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2338{
2339 struct prefix_info *pinfo;
2340 __u32 valid_lft;
2341 __u32 prefered_lft;
2342 int addr_type;
2343 u32 addr_flags = 0;
2344 struct inet6_dev *in6_dev;
2345 struct net *net = dev_net(dev);
2346
2347 pinfo = (struct prefix_info *) opt;
2348
2349 if (len < sizeof(struct prefix_info)) {
2350 ADBG("addrconf: prefix option too short\n");
2351 return;
2352 }
2353
2354 /*
2355 * Validation checks ([ADDRCONF], page 19)
2356 */
2357
2358 addr_type = ipv6_addr_type(&pinfo->prefix);
2359
2360 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2361 return;
2362
2363 valid_lft = ntohl(pinfo->valid);
2364 prefered_lft = ntohl(pinfo->prefered);
2365
2366 if (prefered_lft > valid_lft) {
2367 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2368 return;
2369 }
2370
2371 in6_dev = in6_dev_get(dev);
2372
2373 if (!in6_dev) {
2374 net_dbg_ratelimited("addrconf: device %s not configured\n",
2375 dev->name);
2376 return;
2377 }
2378
2379 /*
2380 * Two things going on here:
2381 * 1) Add routes for on-link prefixes
2382 * 2) Configure prefixes with the auto flag set
2383 */
2384
2385 if (pinfo->onlink) {
2386 struct rt6_info *rt;
2387 unsigned long rt_expires;
2388
2389 /* Avoid arithmetic overflow. Really, we could
2390 * save rt_expires in seconds, likely valid_lft,
2391 * but it would require division in fib gc, that it
2392 * not good.
2393 */
2394 if (HZ > USER_HZ)
2395 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2396 else
2397 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2398
2399 if (addrconf_finite_timeout(rt_expires))
2400 rt_expires *= HZ;
2401
2402 rt = addrconf_get_prefix_route(&pinfo->prefix,
2403 pinfo->prefix_len,
2404 dev,
2405 RTF_ADDRCONF | RTF_PREFIX_RT,
2406 RTF_GATEWAY | RTF_DEFAULT);
2407
2408 if (rt) {
2409 /* Autoconf prefix route */
2410 if (valid_lft == 0) {
2411 ip6_del_rt(rt);
2412 rt = NULL;
2413 } else if (addrconf_finite_timeout(rt_expires)) {
2414 /* not infinity */
2415 rt6_set_expires(rt, jiffies + rt_expires);
2416 } else {
2417 rt6_clean_expires(rt);
2418 }
2419 } else if (valid_lft) {
2420 clock_t expires = 0;
2421 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2422 if (addrconf_finite_timeout(rt_expires)) {
2423 /* not infinity */
2424 flags |= RTF_EXPIRES;
2425 expires = jiffies_to_clock_t(rt_expires);
2426 }
2427 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2428 dev, expires, flags);
2429 }
2430 ip6_rt_put(rt);
2431 }
2432
2433 /* Try to figure out our local address for this prefix */
2434
2435 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2436 struct inet6_ifaddr *ifp;
2437 struct in6_addr addr;
2438 int create = 0, update_lft = 0;
2439 bool tokenized = false;
2440
2441 if (pinfo->prefix_len == 64) {
2442 memcpy(&addr, &pinfo->prefix, 8);
2443
2444 if (!ipv6_addr_any(&in6_dev->token)) {
2445 read_lock_bh(&in6_dev->lock);
2446 memcpy(addr.s6_addr + 8,
2447 in6_dev->token.s6_addr + 8, 8);
2448 read_unlock_bh(&in6_dev->lock);
2449 tokenized = true;
2450 } else if (is_addr_mode_generate_stable(in6_dev) &&
2451 !ipv6_generate_stable_address(&addr, 0,
2452 in6_dev)) {
2453 addr_flags |= IFA_F_STABLE_PRIVACY;
2454 goto ok;
2455 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2456 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2457 in6_dev_put(in6_dev);
2458 return;
2459 }
2460 goto ok;
2461 }
2462 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2463 pinfo->prefix_len);
2464 in6_dev_put(in6_dev);
2465 return;
2466
2467ok:
2468
2469 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2470
2471 if (!ifp && valid_lft) {
2472 int max_addresses = in6_dev->cnf.max_addresses;
2473
2474#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2475 if (in6_dev->cnf.optimistic_dad &&
2476 !net->ipv6.devconf_all->forwarding && sllao)
2477 addr_flags |= IFA_F_OPTIMISTIC;
2478#endif
2479
2480 /* Do not allow to create too much of autoconfigured
2481 * addresses; this would be too easy way to crash kernel.
2482 */
2483 if (!max_addresses ||
2484 ipv6_count_addresses(in6_dev) < max_addresses)
2485 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2486 pinfo->prefix_len,
2487 addr_type&IPV6_ADDR_SCOPE_MASK,
2488 addr_flags, valid_lft,
2489 prefered_lft);
2490
2491 if (IS_ERR_OR_NULL(ifp)) {
2492 in6_dev_put(in6_dev);
2493 return;
2494 }
2495
2496 update_lft = 0;
2497 create = 1;
2498 spin_lock_bh(&ifp->lock);
2499 ifp->flags |= IFA_F_MANAGETEMPADDR;
2500 ifp->cstamp = jiffies;
2501 ifp->tokenized = tokenized;
2502 spin_unlock_bh(&ifp->lock);
2503 addrconf_dad_start(ifp);
2504 }
2505
2506 if (ifp) {
2507 u32 flags;
2508 unsigned long now;
2509 u32 stored_lft;
2510
2511 /* update lifetime (RFC2462 5.5.3 e) */
2512 spin_lock_bh(&ifp->lock);
2513 now = jiffies;
2514 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2515 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2516 else
2517 stored_lft = 0;
2518 if (!update_lft && !create && stored_lft) {
2519 const u32 minimum_lft = min_t(u32,
2520 stored_lft, MIN_VALID_LIFETIME);
2521 valid_lft = max(valid_lft, minimum_lft);
2522
2523 /* RFC4862 Section 5.5.3e:
2524 * "Note that the preferred lifetime of the
2525 * corresponding address is always reset to
2526 * the Preferred Lifetime in the received
2527 * Prefix Information option, regardless of
2528 * whether the valid lifetime is also reset or
2529 * ignored."
2530 *
2531 * So we should always update prefered_lft here.
2532 */
2533 update_lft = 1;
2534 }
2535
2536 if (update_lft) {
2537 ifp->valid_lft = valid_lft;
2538 ifp->prefered_lft = prefered_lft;
2539 ifp->tstamp = now;
2540 flags = ifp->flags;
2541 ifp->flags &= ~IFA_F_DEPRECATED;
2542 spin_unlock_bh(&ifp->lock);
2543
2544 if (!(flags&IFA_F_TENTATIVE))
2545 ipv6_ifa_notify(0, ifp);
2546 } else
2547 spin_unlock_bh(&ifp->lock);
2548
2549 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2550 create, now);
2551
2552 in6_ifa_put(ifp);
2553 addrconf_verify();
2554 }
2555 }
2556 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2557 in6_dev_put(in6_dev);
2558}
2559
2560/*
2561 * Set destination address.
2562 * Special case for SIT interfaces where we create a new "virtual"
2563 * device.
2564 */
2565int addrconf_set_dstaddr(struct net *net, void __user *arg)
2566{
2567 struct in6_ifreq ireq;
2568 struct net_device *dev;
2569 int err = -EINVAL;
2570
2571 rtnl_lock();
2572
2573 err = -EFAULT;
2574 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2575 goto err_exit;
2576
2577 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2578
2579 err = -ENODEV;
2580 if (!dev)
2581 goto err_exit;
2582
2583#if IS_ENABLED(CONFIG_IPV6_SIT)
2584 if (dev->type == ARPHRD_SIT) {
2585 const struct net_device_ops *ops = dev->netdev_ops;
2586 struct ifreq ifr;
2587 struct ip_tunnel_parm p;
2588
2589 err = -EADDRNOTAVAIL;
2590 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2591 goto err_exit;
2592
2593 memset(&p, 0, sizeof(p));
2594 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2595 p.iph.saddr = 0;
2596 p.iph.version = 4;
2597 p.iph.ihl = 5;
2598 p.iph.protocol = IPPROTO_IPV6;
2599 p.iph.ttl = 64;
2600 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2601
2602 if (ops->ndo_do_ioctl) {
2603 mm_segment_t oldfs = get_fs();
2604
2605 set_fs(KERNEL_DS);
2606 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2607 set_fs(oldfs);
2608 } else
2609 err = -EOPNOTSUPP;
2610
2611 if (err == 0) {
2612 err = -ENOBUFS;
2613 dev = __dev_get_by_name(net, p.name);
2614 if (!dev)
2615 goto err_exit;
2616 err = dev_open(dev);
2617 }
2618 }
2619#endif
2620
2621err_exit:
2622 rtnl_unlock();
2623 return err;
2624}
2625
2626static int ipv6_mc_config(struct sock *sk, bool join,
2627 const struct in6_addr *addr, int ifindex)
2628{
2629 int ret;
2630
2631 ASSERT_RTNL();
2632
2633 lock_sock(sk);
2634 if (join)
2635 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2636 else
2637 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2638 release_sock(sk);
2639
2640 return ret;
2641}
2642
2643/*
2644 * Manual configuration of address on an interface
2645 */
2646static int inet6_addr_add(struct net *net, int ifindex,
2647 const struct in6_addr *pfx,
2648 const struct in6_addr *peer_pfx,
2649 unsigned int plen, __u32 ifa_flags,
2650 __u32 prefered_lft, __u32 valid_lft)
2651{
2652 struct inet6_ifaddr *ifp;
2653 struct inet6_dev *idev;
2654 struct net_device *dev;
2655 unsigned long timeout;
2656 clock_t expires;
2657 int scope;
2658 u32 flags;
2659
2660 ASSERT_RTNL();
2661
2662 if (plen > 128)
2663 return -EINVAL;
2664
2665 /* check the lifetime */
2666 if (!valid_lft || prefered_lft > valid_lft)
2667 return -EINVAL;
2668
2669 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2670 return -EINVAL;
2671
2672 dev = __dev_get_by_index(net, ifindex);
2673 if (!dev)
2674 return -ENODEV;
2675
2676 idev = addrconf_add_dev(dev);
2677 if (IS_ERR(idev))
2678 return PTR_ERR(idev);
2679
2680 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2681 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2682 true, pfx, ifindex);
2683
2684 if (ret < 0)
2685 return ret;
2686 }
2687
2688 scope = ipv6_addr_scope(pfx);
2689
2690 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2691 if (addrconf_finite_timeout(timeout)) {
2692 expires = jiffies_to_clock_t(timeout * HZ);
2693 valid_lft = timeout;
2694 flags = RTF_EXPIRES;
2695 } else {
2696 expires = 0;
2697 flags = 0;
2698 ifa_flags |= IFA_F_PERMANENT;
2699 }
2700
2701 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2702 if (addrconf_finite_timeout(timeout)) {
2703 if (timeout == 0)
2704 ifa_flags |= IFA_F_DEPRECATED;
2705 prefered_lft = timeout;
2706 }
2707
2708 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2709 valid_lft, prefered_lft);
2710
2711 if (!IS_ERR(ifp)) {
2712 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2713 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2714 expires, flags);
2715 }
2716
2717 /*
2718 * Note that section 3.1 of RFC 4429 indicates
2719 * that the Optimistic flag should not be set for
2720 * manually configured addresses
2721 */
2722 addrconf_dad_start(ifp);
2723 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2724 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2725 true, jiffies);
2726 in6_ifa_put(ifp);
2727 addrconf_verify_rtnl();
2728 return 0;
2729 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2730 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2731 false, pfx, ifindex);
2732 }
2733
2734 return PTR_ERR(ifp);
2735}
2736
2737static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2738 const struct in6_addr *pfx, unsigned int plen)
2739{
2740 struct inet6_ifaddr *ifp;
2741 struct inet6_dev *idev;
2742 struct net_device *dev;
2743
2744 if (plen > 128)
2745 return -EINVAL;
2746
2747 dev = __dev_get_by_index(net, ifindex);
2748 if (!dev)
2749 return -ENODEV;
2750
2751 idev = __in6_dev_get(dev);
2752 if (!idev)
2753 return -ENXIO;
2754
2755 read_lock_bh(&idev->lock);
2756 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2757 if (ifp->prefix_len == plen &&
2758 ipv6_addr_equal(pfx, &ifp->addr)) {
2759 in6_ifa_hold(ifp);
2760 read_unlock_bh(&idev->lock);
2761
2762 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2763 (ifa_flags & IFA_F_MANAGETEMPADDR))
2764 manage_tempaddrs(idev, ifp, 0, 0, false,
2765 jiffies);
2766 ipv6_del_addr(ifp);
2767 addrconf_verify_rtnl();
2768 if (ipv6_addr_is_multicast(pfx)) {
2769 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2770 false, pfx, dev->ifindex);
2771 }
2772 return 0;
2773 }
2774 }
2775 read_unlock_bh(&idev->lock);
2776 return -EADDRNOTAVAIL;
2777}
2778
2779
2780int addrconf_add_ifaddr(struct net *net, void __user *arg)
2781{
2782 struct in6_ifreq ireq;
2783 int err;
2784
2785 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2786 return -EPERM;
2787
2788 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2789 return -EFAULT;
2790
2791 rtnl_lock();
2792 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2793 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2794 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2795 rtnl_unlock();
2796 return err;
2797}
2798
2799int addrconf_del_ifaddr(struct net *net, void __user *arg)
2800{
2801 struct in6_ifreq ireq;
2802 int err;
2803
2804 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2805 return -EPERM;
2806
2807 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2808 return -EFAULT;
2809
2810 rtnl_lock();
2811 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2812 ireq.ifr6_prefixlen);
2813 rtnl_unlock();
2814 return err;
2815}
2816
2817static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2818 int plen, int scope)
2819{
2820 struct inet6_ifaddr *ifp;
2821
2822 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2823 scope, IFA_F_PERMANENT,
2824 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2825 if (!IS_ERR(ifp)) {
2826 spin_lock_bh(&ifp->lock);
2827 ifp->flags &= ~IFA_F_TENTATIVE;
2828 spin_unlock_bh(&ifp->lock);
2829 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2830 in6_ifa_put(ifp);
2831 }
2832}
2833
2834#if IS_ENABLED(CONFIG_IPV6_SIT)
2835static void sit_add_v4_addrs(struct inet6_dev *idev)
2836{
2837 struct in6_addr addr;
2838 struct net_device *dev;
2839 struct net *net = dev_net(idev->dev);
2840 int scope, plen;
2841 u32 pflags = 0;
2842
2843 ASSERT_RTNL();
2844
2845 memset(&addr, 0, sizeof(struct in6_addr));
2846 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2847
2848 if (idev->dev->flags&IFF_POINTOPOINT) {
2849 addr.s6_addr32[0] = htonl(0xfe800000);
2850 scope = IFA_LINK;
2851 plen = 64;
2852 } else {
2853 scope = IPV6_ADDR_COMPATv4;
2854 plen = 96;
2855 pflags |= RTF_NONEXTHOP;
2856 }
2857
2858 if (addr.s6_addr32[3]) {
2859 add_addr(idev, &addr, plen, scope);
2860 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2861 return;
2862 }
2863
2864 for_each_netdev(net, dev) {
2865 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2866 if (in_dev && (dev->flags & IFF_UP)) {
2867 struct in_ifaddr *ifa;
2868
2869 int flag = scope;
2870
2871 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2872
2873 addr.s6_addr32[3] = ifa->ifa_local;
2874
2875 if (ifa->ifa_scope == RT_SCOPE_LINK)
2876 continue;
2877 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2878 if (idev->dev->flags&IFF_POINTOPOINT)
2879 continue;
2880 flag |= IFA_HOST;
2881 }
2882
2883 add_addr(idev, &addr, plen, flag);
2884 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2885 pflags);
2886 }
2887 }
2888 }
2889}
2890#endif
2891
2892static void init_loopback(struct net_device *dev)
2893{
2894 struct inet6_dev *idev;
2895 struct net_device *sp_dev;
2896 struct inet6_ifaddr *sp_ifa;
2897 struct rt6_info *sp_rt;
2898
2899 /* ::1 */
2900
2901 ASSERT_RTNL();
2902
2903 idev = ipv6_find_idev(dev);
2904 if (!idev) {
2905 pr_debug("%s: add_dev failed\n", __func__);
2906 return;
2907 }
2908
2909 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2910
2911 /* Add routes to other interface's IPv6 addresses */
2912 for_each_netdev(dev_net(dev), sp_dev) {
2913 if (!strcmp(sp_dev->name, dev->name))
2914 continue;
2915
2916 idev = __in6_dev_get(sp_dev);
2917 if (!idev)
2918 continue;
2919
2920 read_lock_bh(&idev->lock);
2921 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2922
2923 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2924 continue;
2925
2926 if (sp_ifa->rt) {
2927 /* This dst has been added to garbage list when
2928 * lo device down, release this obsolete dst and
2929 * reallocate a new router for ifa.
2930 */
2931 if (sp_ifa->rt->dst.obsolete > 0) {
2932 ip6_rt_put(sp_ifa->rt);
2933 sp_ifa->rt = NULL;
2934 } else {
2935 continue;
2936 }
2937 }
2938
2939 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2940
2941 /* Failure cases are ignored */
2942 if (!IS_ERR(sp_rt)) {
2943 sp_ifa->rt = sp_rt;
2944 ip6_ins_rt(sp_rt);
2945 }
2946 }
2947 read_unlock_bh(&idev->lock);
2948 }
2949}
2950
2951static void addrconf_add_linklocal(struct inet6_dev *idev,
2952 const struct in6_addr *addr, u32 flags)
2953{
2954 struct inet6_ifaddr *ifp;
2955 u32 addr_flags = flags | IFA_F_PERMANENT;
2956
2957#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2958 if (idev->cnf.optimistic_dad &&
2959 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2960 addr_flags |= IFA_F_OPTIMISTIC;
2961#endif
2962
2963 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2964 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2965 if (!IS_ERR(ifp)) {
2966 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2967 addrconf_dad_start(ifp);
2968 in6_ifa_put(ifp);
2969 }
2970}
2971
2972static bool ipv6_reserved_interfaceid(struct in6_addr address)
2973{
2974 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2975 return true;
2976
2977 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2978 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2979 return true;
2980
2981 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2982 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2983 return true;
2984
2985 return false;
2986}
2987
2988static int ipv6_generate_stable_address(struct in6_addr *address,
2989 u8 dad_count,
2990 const struct inet6_dev *idev)
2991{
2992 static DEFINE_SPINLOCK(lock);
2993 static __u32 digest[SHA_DIGEST_WORDS];
2994 static __u32 workspace[SHA_WORKSPACE_WORDS];
2995
2996 static union {
2997 char __data[SHA_MESSAGE_BYTES];
2998 struct {
2999 struct in6_addr secret;
3000 __be32 prefix[2];
3001 unsigned char hwaddr[MAX_ADDR_LEN];
3002 u8 dad_count;
3003 } __packed;
3004 } data;
3005
3006 struct in6_addr secret;
3007 struct in6_addr temp;
3008 struct net *net = dev_net(idev->dev);
3009
3010 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3011
3012 if (idev->cnf.stable_secret.initialized)
3013 secret = idev->cnf.stable_secret.secret;
3014 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3015 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3016 else
3017 return -1;
3018
3019retry:
3020 spin_lock_bh(&lock);
3021
3022 sha_init(digest);
3023 memset(&data, 0, sizeof(data));
3024 memset(workspace, 0, sizeof(workspace));
3025 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3026 data.prefix[0] = address->s6_addr32[0];
3027 data.prefix[1] = address->s6_addr32[1];
3028 data.secret = secret;
3029 data.dad_count = dad_count;
3030
3031 sha_transform(digest, data.__data, workspace);
3032
3033 temp = *address;
3034 temp.s6_addr32[2] = (__force __be32)digest[0];
3035 temp.s6_addr32[3] = (__force __be32)digest[1];
3036
3037 spin_unlock_bh(&lock);
3038
3039 if (ipv6_reserved_interfaceid(temp)) {
3040 dad_count++;
3041 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3042 return -1;
3043 goto retry;
3044 }
3045
3046 *address = temp;
3047 return 0;
3048}
3049
3050static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3051{
3052 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3053
3054 if (s->initialized)
3055 return;
3056 s = &idev->cnf.stable_secret;
3057 get_random_bytes(&s->secret, sizeof(s->secret));
3058 s->initialized = true;
3059}
3060
3061static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3062{
3063 struct in6_addr addr;
3064
3065 /* no link local addresses on L3 master devices */
3066 if (netif_is_l3_master(idev->dev))
3067 return;
3068
3069 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3070
3071 switch (idev->addr_gen_mode) {
3072 case IN6_ADDR_GEN_MODE_RANDOM:
3073 ipv6_gen_mode_random_init(idev);
3074 /* fallthrough */
3075 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3076 if (!ipv6_generate_stable_address(&addr, 0, idev))
3077 addrconf_add_linklocal(idev, &addr,
3078 IFA_F_STABLE_PRIVACY);
3079 else if (prefix_route)
3080 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3081 break;
3082 case IN6_ADDR_GEN_MODE_EUI64:
3083 /* addrconf_add_linklocal also adds a prefix_route and we
3084 * only need to care about prefix routes if ipv6_generate_eui64
3085 * couldn't generate one.
3086 */
3087 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3088 addrconf_add_linklocal(idev, &addr, 0);
3089 else if (prefix_route)
3090 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3091 break;
3092 case IN6_ADDR_GEN_MODE_NONE:
3093 default:
3094 /* will not add any link local address */
3095 break;
3096 }
3097}
3098
3099static void addrconf_dev_config(struct net_device *dev)
3100{
3101 struct inet6_dev *idev;
3102
3103 ASSERT_RTNL();
3104
3105 if ((dev->type != ARPHRD_ETHER) &&
3106 (dev->type != ARPHRD_FDDI) &&
3107 (dev->type != ARPHRD_ARCNET) &&
3108 (dev->type != ARPHRD_INFINIBAND) &&
3109 (dev->type != ARPHRD_IEEE1394) &&
3110 (dev->type != ARPHRD_TUNNEL6) &&
3111 (dev->type != ARPHRD_6LOWPAN) &&
3112 (dev->type != ARPHRD_NONE)) {
3113 /* Alas, we support only Ethernet autoconfiguration. */
3114 return;
3115 }
3116
3117 idev = addrconf_add_dev(dev);
3118 if (IS_ERR(idev))
3119 return;
3120
3121 /* this device type has no EUI support */
3122 if (dev->type == ARPHRD_NONE &&
3123 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3124 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3125
3126 addrconf_addr_gen(idev, false);
3127}
3128
3129#if IS_ENABLED(CONFIG_IPV6_SIT)
3130static void addrconf_sit_config(struct net_device *dev)
3131{
3132 struct inet6_dev *idev;
3133
3134 ASSERT_RTNL();
3135
3136 /*
3137 * Configure the tunnel with one of our IPv4
3138 * addresses... we should configure all of
3139 * our v4 addrs in the tunnel
3140 */
3141
3142 idev = ipv6_find_idev(dev);
3143 if (!idev) {
3144 pr_debug("%s: add_dev failed\n", __func__);
3145 return;
3146 }
3147
3148 if (dev->priv_flags & IFF_ISATAP) {
3149 addrconf_addr_gen(idev, false);
3150 return;
3151 }
3152
3153 sit_add_v4_addrs(idev);
3154
3155 if (dev->flags&IFF_POINTOPOINT)
3156 addrconf_add_mroute(dev);
3157}
3158#endif
3159
3160#if IS_ENABLED(CONFIG_NET_IPGRE)
3161static void addrconf_gre_config(struct net_device *dev)
3162{
3163 struct inet6_dev *idev;
3164
3165 ASSERT_RTNL();
3166
3167 idev = ipv6_find_idev(dev);
3168 if (!idev) {
3169 pr_debug("%s: add_dev failed\n", __func__);
3170 return;
3171 }
3172
3173 addrconf_addr_gen(idev, true);
3174 if (dev->flags & IFF_POINTOPOINT)
3175 addrconf_add_mroute(dev);
3176}
3177#endif
3178
3179static int fixup_permanent_addr(struct inet6_dev *idev,
3180 struct inet6_ifaddr *ifp)
3181{
3182 if (!ifp->rt) {
3183 struct rt6_info *rt;
3184
3185 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3186 if (unlikely(IS_ERR(rt)))
3187 return PTR_ERR(rt);
3188
3189 ifp->rt = rt;
3190 }
3191
3192 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3193 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3194 idev->dev, 0, 0);
3195 }
3196
3197 addrconf_dad_start(ifp);
3198
3199 return 0;
3200}
3201
3202static void addrconf_permanent_addr(struct net_device *dev)
3203{
3204 struct inet6_ifaddr *ifp, *tmp;
3205 struct inet6_dev *idev;
3206
3207 idev = __in6_dev_get(dev);
3208 if (!idev)
3209 return;
3210
3211 write_lock_bh(&idev->lock);
3212
3213 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3214 if ((ifp->flags & IFA_F_PERMANENT) &&
3215 fixup_permanent_addr(idev, ifp) < 0) {
3216 write_unlock_bh(&idev->lock);
3217 ipv6_del_addr(ifp);
3218 write_lock_bh(&idev->lock);
3219
3220 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3221 idev->dev->name, &ifp->addr);
3222 }
3223 }
3224
3225 write_unlock_bh(&idev->lock);
3226}
3227
3228static int addrconf_notify(struct notifier_block *this, unsigned long event,
3229 void *ptr)
3230{
3231 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3232 struct netdev_notifier_changeupper_info *info;
3233 struct inet6_dev *idev = __in6_dev_get(dev);
3234 int run_pending = 0;
3235 int err;
3236
3237 switch (event) {
3238 case NETDEV_REGISTER:
3239 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3240 idev = ipv6_add_dev(dev);
3241 if (IS_ERR(idev))
3242 return notifier_from_errno(PTR_ERR(idev));
3243 }
3244 break;
3245
3246 case NETDEV_CHANGEMTU:
3247 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3248 if (dev->mtu < IPV6_MIN_MTU) {
3249 addrconf_ifdown(dev, 1);
3250 break;
3251 }
3252
3253 if (idev) {
3254 rt6_mtu_change(dev, dev->mtu);
3255 idev->cnf.mtu6 = dev->mtu;
3256 break;
3257 }
3258
3259 /* allocate new idev */
3260 idev = ipv6_add_dev(dev);
3261 if (IS_ERR(idev))
3262 break;
3263
3264 /* device is still not ready */
3265 if (!(idev->if_flags & IF_READY))
3266 break;
3267
3268 run_pending = 1;
3269
3270 /* fall through */
3271
3272 case NETDEV_UP:
3273 case NETDEV_CHANGE:
3274 if (dev->flags & IFF_SLAVE)
3275 break;
3276
3277 if (idev && idev->cnf.disable_ipv6)
3278 break;
3279
3280 if (event == NETDEV_UP) {
3281 /* restore routes for permanent addresses */
3282 addrconf_permanent_addr(dev);
3283
3284 if (!addrconf_qdisc_ok(dev)) {
3285 /* device is not ready yet. */
3286 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3287 dev->name);
3288 break;
3289 }
3290
3291 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3292 idev = ipv6_add_dev(dev);
3293
3294 if (!IS_ERR_OR_NULL(idev)) {
3295 idev->if_flags |= IF_READY;
3296 run_pending = 1;
3297 }
3298 } else if (event == NETDEV_CHANGE) {
3299 if (!addrconf_qdisc_ok(dev)) {
3300 /* device is still not ready. */
3301 break;
3302 }
3303
3304 if (idev) {
3305 if (idev->if_flags & IF_READY)
3306 /* device is already configured. */
3307 break;
3308 idev->if_flags |= IF_READY;
3309 }
3310
3311 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3312 dev->name);
3313
3314 run_pending = 1;
3315 }
3316
3317 switch (dev->type) {
3318#if IS_ENABLED(CONFIG_IPV6_SIT)
3319 case ARPHRD_SIT:
3320 addrconf_sit_config(dev);
3321 break;
3322#endif
3323#if IS_ENABLED(CONFIG_NET_IPGRE)
3324 case ARPHRD_IPGRE:
3325 addrconf_gre_config(dev);
3326 break;
3327#endif
3328 case ARPHRD_LOOPBACK:
3329 init_loopback(dev);
3330 break;
3331
3332 default:
3333 addrconf_dev_config(dev);
3334 break;
3335 }
3336
3337 if (!IS_ERR_OR_NULL(idev)) {
3338 if (run_pending)
3339 addrconf_dad_run(idev);
3340
3341 /*
3342 * If the MTU changed during the interface down,
3343 * when the interface up, the changed MTU must be
3344 * reflected in the idev as well as routers.
3345 */
3346 if (idev->cnf.mtu6 != dev->mtu &&
3347 dev->mtu >= IPV6_MIN_MTU) {
3348 rt6_mtu_change(dev, dev->mtu);
3349 idev->cnf.mtu6 = dev->mtu;
3350 }
3351 idev->tstamp = jiffies;
3352 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3353
3354 /*
3355 * If the changed mtu during down is lower than
3356 * IPV6_MIN_MTU stop IPv6 on this interface.
3357 */
3358 if (dev->mtu < IPV6_MIN_MTU)
3359 addrconf_ifdown(dev, 1);
3360 }
3361 break;
3362
3363 case NETDEV_DOWN:
3364 case NETDEV_UNREGISTER:
3365 /*
3366 * Remove all addresses from this interface.
3367 */
3368 addrconf_ifdown(dev, event != NETDEV_DOWN);
3369 break;
3370
3371 case NETDEV_CHANGENAME:
3372 if (idev) {
3373 snmp6_unregister_dev(idev);
3374 addrconf_sysctl_unregister(idev);
3375 err = addrconf_sysctl_register(idev);
3376 if (err)
3377 return notifier_from_errno(err);
3378 err = snmp6_register_dev(idev);
3379 if (err) {
3380 addrconf_sysctl_unregister(idev);
3381 return notifier_from_errno(err);
3382 }
3383 }
3384 break;
3385
3386 case NETDEV_PRE_TYPE_CHANGE:
3387 case NETDEV_POST_TYPE_CHANGE:
3388 if (idev)
3389 addrconf_type_change(dev, event);
3390 break;
3391
3392 case NETDEV_CHANGEUPPER:
3393 info = ptr;
3394
3395 /* flush all routes if dev is linked to or unlinked from
3396 * an L3 master device (e.g., VRF)
3397 */
3398 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3399 addrconf_ifdown(dev, 0);
3400 }
3401
3402 return NOTIFY_OK;
3403}
3404
3405/*
3406 * addrconf module should be notified of a device going up
3407 */
3408static struct notifier_block ipv6_dev_notf = {
3409 .notifier_call = addrconf_notify,
3410};
3411
3412static void addrconf_type_change(struct net_device *dev, unsigned long event)
3413{
3414 struct inet6_dev *idev;
3415 ASSERT_RTNL();
3416
3417 idev = __in6_dev_get(dev);
3418
3419 if (event == NETDEV_POST_TYPE_CHANGE)
3420 ipv6_mc_remap(idev);
3421 else if (event == NETDEV_PRE_TYPE_CHANGE)
3422 ipv6_mc_unmap(idev);
3423}
3424
3425static bool addr_is_local(const struct in6_addr *addr)
3426{
3427 return ipv6_addr_type(addr) &
3428 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3429}
3430
3431static int addrconf_ifdown(struct net_device *dev, int how)
3432{
3433 struct net *net = dev_net(dev);
3434 struct inet6_dev *idev;
3435 struct inet6_ifaddr *ifa, *tmp;
3436 struct list_head del_list;
3437 int _keep_addr;
3438 bool keep_addr;
3439 int state, i;
3440
3441 ASSERT_RTNL();
3442
3443 rt6_ifdown(net, dev);
3444 neigh_ifdown(&nd_tbl, dev);
3445
3446 idev = __in6_dev_get(dev);
3447 if (!idev)
3448 return -ENODEV;
3449
3450 /*
3451 * Step 1: remove reference to ipv6 device from parent device.
3452 * Do not dev_put!
3453 */
3454 if (how) {
3455 idev->dead = 1;
3456
3457 /* protected by rtnl_lock */
3458 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3459
3460 /* Step 1.5: remove snmp6 entry */
3461 snmp6_unregister_dev(idev);
3462
3463 }
3464
3465 /* aggregate the system setting and interface setting */
3466 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3467 if (!_keep_addr)
3468 _keep_addr = idev->cnf.keep_addr_on_down;
3469
3470 /* combine the user config with event to determine if permanent
3471 * addresses are to be removed from address hash table
3472 */
3473 keep_addr = !(how || _keep_addr <= 0);
3474
3475 /* Step 2: clear hash table */
3476 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3477 struct hlist_head *h = &inet6_addr_lst[i];
3478
3479 spin_lock_bh(&addrconf_hash_lock);
3480restart:
3481 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3482 if (ifa->idev == idev) {
3483 addrconf_del_dad_work(ifa);
3484 /* combined flag + permanent flag decide if
3485 * address is retained on a down event
3486 */
3487 if (!keep_addr ||
3488 !(ifa->flags & IFA_F_PERMANENT) ||
3489 addr_is_local(&ifa->addr)) {
3490 hlist_del_init_rcu(&ifa->addr_lst);
3491 goto restart;
3492 }
3493 }
3494 }
3495 spin_unlock_bh(&addrconf_hash_lock);
3496 }
3497
3498 write_lock_bh(&idev->lock);
3499
3500 addrconf_del_rs_timer(idev);
3501
3502 /* Step 2: clear flags for stateless addrconf */
3503 if (!how)
3504 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3505
3506 if (how && del_timer(&idev->regen_timer))
3507 in6_dev_put(idev);
3508
3509 /* Step 3: clear tempaddr list */
3510 while (!list_empty(&idev->tempaddr_list)) {
3511 ifa = list_first_entry(&idev->tempaddr_list,
3512 struct inet6_ifaddr, tmp_list);
3513 list_del(&ifa->tmp_list);
3514 write_unlock_bh(&idev->lock);
3515 spin_lock_bh(&ifa->lock);
3516
3517 if (ifa->ifpub) {
3518 in6_ifa_put(ifa->ifpub);
3519 ifa->ifpub = NULL;
3520 }
3521 spin_unlock_bh(&ifa->lock);
3522 in6_ifa_put(ifa);
3523 write_lock_bh(&idev->lock);
3524 }
3525
3526 /* re-combine the user config with event to determine if permanent
3527 * addresses are to be removed from the interface list
3528 */
3529 keep_addr = (!how && _keep_addr > 0);
3530
3531 INIT_LIST_HEAD(&del_list);
3532 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3533 struct rt6_info *rt = NULL;
3534
3535 addrconf_del_dad_work(ifa);
3536
3537 write_unlock_bh(&idev->lock);
3538 spin_lock_bh(&ifa->lock);
3539
3540 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3541 !addr_is_local(&ifa->addr)) {
3542 /* set state to skip the notifier below */
3543 state = INET6_IFADDR_STATE_DEAD;
3544 ifa->state = 0;
3545 if (!(ifa->flags & IFA_F_NODAD))
3546 ifa->flags |= IFA_F_TENTATIVE;
3547
3548 rt = ifa->rt;
3549 ifa->rt = NULL;
3550 } else {
3551 state = ifa->state;
3552 ifa->state = INET6_IFADDR_STATE_DEAD;
3553
3554 list_del(&ifa->if_list);
3555 list_add(&ifa->if_list, &del_list);
3556 }
3557
3558 spin_unlock_bh(&ifa->lock);
3559
3560 if (rt)
3561 ip6_del_rt(rt);
3562
3563 if (state != INET6_IFADDR_STATE_DEAD) {
3564 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3565 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3566 }
3567
3568 write_lock_bh(&idev->lock);
3569 }
3570
3571 write_unlock_bh(&idev->lock);
3572
3573 /* now clean up addresses to be removed */
3574 while (!list_empty(&del_list)) {
3575 ifa = list_first_entry(&del_list,
3576 struct inet6_ifaddr, if_list);
3577 list_del(&ifa->if_list);
3578
3579 in6_ifa_put(ifa);
3580 }
3581
3582 /* Step 5: Discard anycast and multicast list */
3583 if (how) {
3584 ipv6_ac_destroy_dev(idev);
3585 ipv6_mc_destroy_dev(idev);
3586 } else {
3587 ipv6_mc_down(idev);
3588 }
3589
3590 idev->tstamp = jiffies;
3591
3592 /* Last: Shot the device (if unregistered) */
3593 if (how) {
3594 addrconf_sysctl_unregister(idev);
3595 neigh_parms_release(&nd_tbl, idev->nd_parms);
3596 neigh_ifdown(&nd_tbl, dev);
3597 in6_dev_put(idev);
3598 }
3599 return 0;
3600}
3601
3602static void addrconf_rs_timer(unsigned long data)
3603{
3604 struct inet6_dev *idev = (struct inet6_dev *)data;
3605 struct net_device *dev = idev->dev;
3606 struct in6_addr lladdr;
3607
3608 write_lock(&idev->lock);
3609 if (idev->dead || !(idev->if_flags & IF_READY))
3610 goto out;
3611
3612 if (!ipv6_accept_ra(idev))
3613 goto out;
3614
3615 /* Announcement received after solicitation was sent */
3616 if (idev->if_flags & IF_RA_RCVD)
3617 goto out;
3618
3619 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3620 write_unlock(&idev->lock);
3621 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3622 ndisc_send_rs(dev, &lladdr,
3623 &in6addr_linklocal_allrouters);
3624 else
3625 goto put;
3626
3627 write_lock(&idev->lock);
3628 /* The wait after the last probe can be shorter */
3629 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3630 idev->cnf.rtr_solicits) ?
3631 idev->cnf.rtr_solicit_delay :
3632 idev->cnf.rtr_solicit_interval);
3633 } else {
3634 /*
3635 * Note: we do not support deprecated "all on-link"
3636 * assumption any longer.
3637 */
3638 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3639 }
3640
3641out:
3642 write_unlock(&idev->lock);
3643put:
3644 in6_dev_put(idev);
3645}
3646
3647/*
3648 * Duplicate Address Detection
3649 */
3650static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3651{
3652 unsigned long rand_num;
3653 struct inet6_dev *idev = ifp->idev;
3654
3655 if (ifp->flags & IFA_F_OPTIMISTIC)
3656 rand_num = 0;
3657 else
3658 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3659
3660 ifp->dad_probes = idev->cnf.dad_transmits;
3661 addrconf_mod_dad_work(ifp, rand_num);
3662}
3663
3664static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3665{
3666 struct inet6_dev *idev = ifp->idev;
3667 struct net_device *dev = idev->dev;
3668 bool notify = false;
3669
3670 addrconf_join_solict(dev, &ifp->addr);
3671
3672 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3673
3674 read_lock_bh(&idev->lock);
3675 spin_lock(&ifp->lock);
3676 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3677 goto out;
3678
3679 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3680 idev->cnf.accept_dad < 1 ||
3681 !(ifp->flags&IFA_F_TENTATIVE) ||
3682 ifp->flags & IFA_F_NODAD) {
3683 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3684 spin_unlock(&ifp->lock);
3685 read_unlock_bh(&idev->lock);
3686
3687 addrconf_dad_completed(ifp);
3688 return;
3689 }
3690
3691 if (!(idev->if_flags & IF_READY)) {
3692 spin_unlock(&ifp->lock);
3693 read_unlock_bh(&idev->lock);
3694 /*
3695 * If the device is not ready:
3696 * - keep it tentative if it is a permanent address.
3697 * - otherwise, kill it.
3698 */
3699 in6_ifa_hold(ifp);
3700 addrconf_dad_stop(ifp, 0);
3701 return;
3702 }
3703
3704 /*
3705 * Optimistic nodes can start receiving
3706 * Frames right away
3707 */
3708 if (ifp->flags & IFA_F_OPTIMISTIC) {
3709 ip6_ins_rt(ifp->rt);
3710 if (ipv6_use_optimistic_addr(idev)) {
3711 /* Because optimistic nodes can use this address,
3712 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3713 */
3714 notify = true;
3715 }
3716 }
3717
3718 addrconf_dad_kick(ifp);
3719out:
3720 spin_unlock(&ifp->lock);
3721 read_unlock_bh(&idev->lock);
3722 if (notify)
3723 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3724}
3725
3726static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3727{
3728 bool begin_dad = false;
3729
3730 spin_lock_bh(&ifp->lock);
3731 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3732 ifp->state = INET6_IFADDR_STATE_PREDAD;
3733 begin_dad = true;
3734 }
3735 spin_unlock_bh(&ifp->lock);
3736
3737 if (begin_dad)
3738 addrconf_mod_dad_work(ifp, 0);
3739}
3740
3741static void addrconf_dad_work(struct work_struct *w)
3742{
3743 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3744 struct inet6_ifaddr,
3745 dad_work);
3746 struct inet6_dev *idev = ifp->idev;
3747 struct in6_addr mcaddr;
3748
3749 enum {
3750 DAD_PROCESS,
3751 DAD_BEGIN,
3752 DAD_ABORT,
3753 } action = DAD_PROCESS;
3754
3755 rtnl_lock();
3756
3757 spin_lock_bh(&ifp->lock);
3758 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3759 action = DAD_BEGIN;
3760 ifp->state = INET6_IFADDR_STATE_DAD;
3761 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3762 action = DAD_ABORT;
3763 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3764 }
3765 spin_unlock_bh(&ifp->lock);
3766
3767 if (action == DAD_BEGIN) {
3768 addrconf_dad_begin(ifp);
3769 goto out;
3770 } else if (action == DAD_ABORT) {
3771 addrconf_dad_stop(ifp, 1);
3772 goto out;
3773 }
3774
3775 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3776 goto out;
3777
3778 write_lock_bh(&idev->lock);
3779 if (idev->dead || !(idev->if_flags & IF_READY)) {
3780 write_unlock_bh(&idev->lock);
3781 goto out;
3782 }
3783
3784 spin_lock(&ifp->lock);
3785 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3786 spin_unlock(&ifp->lock);
3787 write_unlock_bh(&idev->lock);
3788 goto out;
3789 }
3790
3791 if (ifp->dad_probes == 0) {
3792 /*
3793 * DAD was successful
3794 */
3795
3796 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3797 spin_unlock(&ifp->lock);
3798 write_unlock_bh(&idev->lock);
3799
3800 addrconf_dad_completed(ifp);
3801
3802 goto out;
3803 }
3804
3805 ifp->dad_probes--;
3806 addrconf_mod_dad_work(ifp,
3807 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3808 spin_unlock(&ifp->lock);
3809 write_unlock_bh(&idev->lock);
3810
3811 /* send a neighbour solicitation for our addr */
3812 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3813 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3814out:
3815 in6_ifa_put(ifp);
3816 rtnl_unlock();
3817}
3818
3819/* ifp->idev must be at least read locked */
3820static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3821{
3822 struct inet6_ifaddr *ifpiter;
3823 struct inet6_dev *idev = ifp->idev;
3824
3825 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3826 if (ifpiter->scope > IFA_LINK)
3827 break;
3828 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3829 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3830 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3831 IFA_F_PERMANENT)
3832 return false;
3833 }
3834 return true;
3835}
3836
3837static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3838{
3839 struct net_device *dev = ifp->idev->dev;
3840 struct in6_addr lladdr;
3841 bool send_rs, send_mld;
3842
3843 addrconf_del_dad_work(ifp);
3844
3845 /*
3846 * Configure the address for reception. Now it is valid.
3847 */
3848
3849 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3850
3851 /* If added prefix is link local and we are prepared to process
3852 router advertisements, start sending router solicitations.
3853 */
3854
3855 read_lock_bh(&ifp->idev->lock);
3856 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3857 send_rs = send_mld &&
3858 ipv6_accept_ra(ifp->idev) &&
3859 ifp->idev->cnf.rtr_solicits > 0 &&
3860 (dev->flags&IFF_LOOPBACK) == 0;
3861 read_unlock_bh(&ifp->idev->lock);
3862
3863 /* While dad is in progress mld report's source address is in6_addrany.
3864 * Resend with proper ll now.
3865 */
3866 if (send_mld)
3867 ipv6_mc_dad_complete(ifp->idev);
3868
3869 if (send_rs) {
3870 /*
3871 * If a host as already performed a random delay
3872 * [...] as part of DAD [...] there is no need
3873 * to delay again before sending the first RS
3874 */
3875 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3876 return;
3877 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3878
3879 write_lock_bh(&ifp->idev->lock);
3880 spin_lock(&ifp->lock);
3881 ifp->idev->rs_probes = 1;
3882 ifp->idev->if_flags |= IF_RS_SENT;
3883 addrconf_mod_rs_timer(ifp->idev,
3884 ifp->idev->cnf.rtr_solicit_interval);
3885 spin_unlock(&ifp->lock);
3886 write_unlock_bh(&ifp->idev->lock);
3887 }
3888}
3889
3890static void addrconf_dad_run(struct inet6_dev *idev)
3891{
3892 struct inet6_ifaddr *ifp;
3893
3894 read_lock_bh(&idev->lock);
3895 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3896 spin_lock(&ifp->lock);
3897 if (ifp->flags & IFA_F_TENTATIVE &&
3898 ifp->state == INET6_IFADDR_STATE_DAD)
3899 addrconf_dad_kick(ifp);
3900 spin_unlock(&ifp->lock);
3901 }
3902 read_unlock_bh(&idev->lock);
3903}
3904
3905#ifdef CONFIG_PROC_FS
3906struct if6_iter_state {
3907 struct seq_net_private p;
3908 int bucket;
3909 int offset;
3910};
3911
3912static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3913{
3914 struct inet6_ifaddr *ifa = NULL;
3915 struct if6_iter_state *state = seq->private;
3916 struct net *net = seq_file_net(seq);
3917 int p = 0;
3918
3919 /* initial bucket if pos is 0 */
3920 if (pos == 0) {
3921 state->bucket = 0;
3922 state->offset = 0;
3923 }
3924
3925 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3926 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3927 addr_lst) {
3928 if (!net_eq(dev_net(ifa->idev->dev), net))
3929 continue;
3930 /* sync with offset */
3931 if (p < state->offset) {
3932 p++;
3933 continue;
3934 }
3935 state->offset++;
3936 return ifa;
3937 }
3938
3939 /* prepare for next bucket */
3940 state->offset = 0;
3941 p = 0;
3942 }
3943 return NULL;
3944}
3945
3946static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3947 struct inet6_ifaddr *ifa)
3948{
3949 struct if6_iter_state *state = seq->private;
3950 struct net *net = seq_file_net(seq);
3951
3952 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3953 if (!net_eq(dev_net(ifa->idev->dev), net))
3954 continue;
3955 state->offset++;
3956 return ifa;
3957 }
3958
3959 while (++state->bucket < IN6_ADDR_HSIZE) {
3960 state->offset = 0;
3961 hlist_for_each_entry_rcu_bh(ifa,
3962 &inet6_addr_lst[state->bucket], addr_lst) {
3963 if (!net_eq(dev_net(ifa->idev->dev), net))
3964 continue;
3965 state->offset++;
3966 return ifa;
3967 }
3968 }
3969
3970 return NULL;
3971}
3972
3973static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3974 __acquires(rcu_bh)
3975{
3976 rcu_read_lock_bh();
3977 return if6_get_first(seq, *pos);
3978}
3979
3980static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3981{
3982 struct inet6_ifaddr *ifa;
3983
3984 ifa = if6_get_next(seq, v);
3985 ++*pos;
3986 return ifa;
3987}
3988
3989static void if6_seq_stop(struct seq_file *seq, void *v)
3990 __releases(rcu_bh)
3991{
3992 rcu_read_unlock_bh();
3993}
3994
3995static int if6_seq_show(struct seq_file *seq, void *v)
3996{
3997 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3998 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3999 &ifp->addr,
4000 ifp->idev->dev->ifindex,
4001 ifp->prefix_len,
4002 ifp->scope,
4003 (u8) ifp->flags,
4004 ifp->idev->dev->name);
4005 return 0;
4006}
4007
4008static const struct seq_operations if6_seq_ops = {
4009 .start = if6_seq_start,
4010 .next = if6_seq_next,
4011 .show = if6_seq_show,
4012 .stop = if6_seq_stop,
4013};
4014
4015static int if6_seq_open(struct inode *inode, struct file *file)
4016{
4017 return seq_open_net(inode, file, &if6_seq_ops,
4018 sizeof(struct if6_iter_state));
4019}
4020
4021static const struct file_operations if6_fops = {
4022 .owner = THIS_MODULE,
4023 .open = if6_seq_open,
4024 .read = seq_read,
4025 .llseek = seq_lseek,
4026 .release = seq_release_net,
4027};
4028
4029static int __net_init if6_proc_net_init(struct net *net)
4030{
4031 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4032 return -ENOMEM;
4033 return 0;
4034}
4035
4036static void __net_exit if6_proc_net_exit(struct net *net)
4037{
4038 remove_proc_entry("if_inet6", net->proc_net);
4039}
4040
4041static struct pernet_operations if6_proc_net_ops = {
4042 .init = if6_proc_net_init,
4043 .exit = if6_proc_net_exit,
4044};
4045
4046int __init if6_proc_init(void)
4047{
4048 return register_pernet_subsys(&if6_proc_net_ops);
4049}
4050
4051void if6_proc_exit(void)
4052{
4053 unregister_pernet_subsys(&if6_proc_net_ops);
4054}
4055#endif /* CONFIG_PROC_FS */
4056
4057#if IS_ENABLED(CONFIG_IPV6_MIP6)
4058/* Check if address is a home address configured on any interface. */
4059int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4060{
4061 int ret = 0;
4062 struct inet6_ifaddr *ifp = NULL;
4063 unsigned int hash = inet6_addr_hash(addr);
4064
4065 rcu_read_lock_bh();
4066 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4067 if (!net_eq(dev_net(ifp->idev->dev), net))
4068 continue;
4069 if (ipv6_addr_equal(&ifp->addr, addr) &&
4070 (ifp->flags & IFA_F_HOMEADDRESS)) {
4071 ret = 1;
4072 break;
4073 }
4074 }
4075 rcu_read_unlock_bh();
4076 return ret;
4077}
4078#endif
4079
4080/*
4081 * Periodic address status verification
4082 */
4083
4084static void addrconf_verify_rtnl(void)
4085{
4086 unsigned long now, next, next_sec, next_sched;
4087 struct inet6_ifaddr *ifp;
4088 int i;
4089
4090 ASSERT_RTNL();
4091
4092 rcu_read_lock_bh();
4093 now = jiffies;
4094 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4095
4096 cancel_delayed_work(&addr_chk_work);
4097
4098 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4099restart:
4100 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4101 unsigned long age;
4102
4103 /* When setting preferred_lft to a value not zero or
4104 * infinity, while valid_lft is infinity
4105 * IFA_F_PERMANENT has a non-infinity life time.
4106 */
4107 if ((ifp->flags & IFA_F_PERMANENT) &&
4108 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4109 continue;
4110
4111 spin_lock(&ifp->lock);
4112 /* We try to batch several events at once. */
4113 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4114
4115 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4116 age >= ifp->valid_lft) {
4117 spin_unlock(&ifp->lock);
4118 in6_ifa_hold(ifp);
4119 ipv6_del_addr(ifp);
4120 goto restart;
4121 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4122 spin_unlock(&ifp->lock);
4123 continue;
4124 } else if (age >= ifp->prefered_lft) {
4125 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4126 int deprecate = 0;
4127
4128 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4129 deprecate = 1;
4130 ifp->flags |= IFA_F_DEPRECATED;
4131 }
4132
4133 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4134 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4135 next = ifp->tstamp + ifp->valid_lft * HZ;
4136
4137 spin_unlock(&ifp->lock);
4138
4139 if (deprecate) {
4140 in6_ifa_hold(ifp);
4141
4142 ipv6_ifa_notify(0, ifp);
4143 in6_ifa_put(ifp);
4144 goto restart;
4145 }
4146 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4147 !(ifp->flags&IFA_F_TENTATIVE)) {
4148 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4149 ifp->idev->cnf.dad_transmits *
4150 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4151
4152 if (age >= ifp->prefered_lft - regen_advance) {
4153 struct inet6_ifaddr *ifpub = ifp->ifpub;
4154 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4155 next = ifp->tstamp + ifp->prefered_lft * HZ;
4156 if (!ifp->regen_count && ifpub) {
4157 ifp->regen_count++;
4158 in6_ifa_hold(ifp);
4159 in6_ifa_hold(ifpub);
4160 spin_unlock(&ifp->lock);
4161
4162 spin_lock(&ifpub->lock);
4163 ifpub->regen_count = 0;
4164 spin_unlock(&ifpub->lock);
4165 ipv6_create_tempaddr(ifpub, ifp);
4166 in6_ifa_put(ifpub);
4167 in6_ifa_put(ifp);
4168 goto restart;
4169 }
4170 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4171 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4172 spin_unlock(&ifp->lock);
4173 } else {
4174 /* ifp->prefered_lft <= ifp->valid_lft */
4175 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4176 next = ifp->tstamp + ifp->prefered_lft * HZ;
4177 spin_unlock(&ifp->lock);
4178 }
4179 }
4180 }
4181
4182 next_sec = round_jiffies_up(next);
4183 next_sched = next;
4184
4185 /* If rounded timeout is accurate enough, accept it. */
4186 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4187 next_sched = next_sec;
4188
4189 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4190 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4191 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4192
4193 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4194 now, next, next_sec, next_sched);
4195 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4196 rcu_read_unlock_bh();
4197}
4198
4199static void addrconf_verify_work(struct work_struct *w)
4200{
4201 rtnl_lock();
4202 addrconf_verify_rtnl();
4203 rtnl_unlock();
4204}
4205
4206static void addrconf_verify(void)
4207{
4208 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4209}
4210
4211static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4212 struct in6_addr **peer_pfx)
4213{
4214 struct in6_addr *pfx = NULL;
4215
4216 *peer_pfx = NULL;
4217
4218 if (addr)
4219 pfx = nla_data(addr);
4220
4221 if (local) {
4222 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4223 *peer_pfx = pfx;
4224 pfx = nla_data(local);
4225 }
4226
4227 return pfx;
4228}
4229
4230static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4231 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4232 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4233 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4234 [IFA_FLAGS] = { .len = sizeof(u32) },
4235};
4236
4237static int
4238inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4239{
4240 struct net *net = sock_net(skb->sk);
4241 struct ifaddrmsg *ifm;
4242 struct nlattr *tb[IFA_MAX+1];
4243 struct in6_addr *pfx, *peer_pfx;
4244 u32 ifa_flags;
4245 int err;
4246
4247 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4248 if (err < 0)
4249 return err;
4250
4251 ifm = nlmsg_data(nlh);
4252 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4253 if (!pfx)
4254 return -EINVAL;
4255
4256 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4257
4258 /* We ignore other flags so far. */
4259 ifa_flags &= IFA_F_MANAGETEMPADDR;
4260
4261 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4262 ifm->ifa_prefixlen);
4263}
4264
4265static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4266 u32 prefered_lft, u32 valid_lft)
4267{
4268 u32 flags;
4269 clock_t expires;
4270 unsigned long timeout;
4271 bool was_managetempaddr;
4272 bool had_prefixroute;
4273
4274 ASSERT_RTNL();
4275
4276 if (!valid_lft || (prefered_lft > valid_lft))
4277 return -EINVAL;
4278
4279 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4280 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4281 return -EINVAL;
4282
4283 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4284 if (addrconf_finite_timeout(timeout)) {
4285 expires = jiffies_to_clock_t(timeout * HZ);
4286 valid_lft = timeout;
4287 flags = RTF_EXPIRES;
4288 } else {
4289 expires = 0;
4290 flags = 0;
4291 ifa_flags |= IFA_F_PERMANENT;
4292 }
4293
4294 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4295 if (addrconf_finite_timeout(timeout)) {
4296 if (timeout == 0)
4297 ifa_flags |= IFA_F_DEPRECATED;
4298 prefered_lft = timeout;
4299 }
4300
4301 spin_lock_bh(&ifp->lock);
4302 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4303 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4304 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4305 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4306 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4307 IFA_F_NOPREFIXROUTE);
4308 ifp->flags |= ifa_flags;
4309 ifp->tstamp = jiffies;
4310 ifp->valid_lft = valid_lft;
4311 ifp->prefered_lft = prefered_lft;
4312
4313 spin_unlock_bh(&ifp->lock);
4314 if (!(ifp->flags&IFA_F_TENTATIVE))
4315 ipv6_ifa_notify(0, ifp);
4316
4317 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4318 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4319 expires, flags);
4320 } else if (had_prefixroute) {
4321 enum cleanup_prefix_rt_t action;
4322 unsigned long rt_expires;
4323
4324 write_lock_bh(&ifp->idev->lock);
4325 action = check_cleanup_prefix_route(ifp, &rt_expires);
4326 write_unlock_bh(&ifp->idev->lock);
4327
4328 if (action != CLEANUP_PREFIX_RT_NOP) {
4329 cleanup_prefix_route(ifp, rt_expires,
4330 action == CLEANUP_PREFIX_RT_DEL);
4331 }
4332 }
4333
4334 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4335 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4336 valid_lft = prefered_lft = 0;
4337 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4338 !was_managetempaddr, jiffies);
4339 }
4340
4341 addrconf_verify_rtnl();
4342
4343 return 0;
4344}
4345
4346static int
4347inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4348{
4349 struct net *net = sock_net(skb->sk);
4350 struct ifaddrmsg *ifm;
4351 struct nlattr *tb[IFA_MAX+1];
4352 struct in6_addr *pfx, *peer_pfx;
4353 struct inet6_ifaddr *ifa;
4354 struct net_device *dev;
4355 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4356 u32 ifa_flags;
4357 int err;
4358
4359 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4360 if (err < 0)
4361 return err;
4362
4363 ifm = nlmsg_data(nlh);
4364 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4365 if (!pfx)
4366 return -EINVAL;
4367
4368 if (tb[IFA_CACHEINFO]) {
4369 struct ifa_cacheinfo *ci;
4370
4371 ci = nla_data(tb[IFA_CACHEINFO]);
4372 valid_lft = ci->ifa_valid;
4373 preferred_lft = ci->ifa_prefered;
4374 } else {
4375 preferred_lft = INFINITY_LIFE_TIME;
4376 valid_lft = INFINITY_LIFE_TIME;
4377 }
4378
4379 dev = __dev_get_by_index(net, ifm->ifa_index);
4380 if (!dev)
4381 return -ENODEV;
4382
4383 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4384
4385 /* We ignore other flags so far. */
4386 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4387 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4388
4389 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4390 if (!ifa) {
4391 /*
4392 * It would be best to check for !NLM_F_CREATE here but
4393 * userspace already relies on not having to provide this.
4394 */
4395 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4396 ifm->ifa_prefixlen, ifa_flags,
4397 preferred_lft, valid_lft);
4398 }
4399
4400 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4401 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4402 err = -EEXIST;
4403 else
4404 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4405
4406 in6_ifa_put(ifa);
4407
4408 return err;
4409}
4410
4411static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4412 u8 scope, int ifindex)
4413{
4414 struct ifaddrmsg *ifm;
4415
4416 ifm = nlmsg_data(nlh);
4417 ifm->ifa_family = AF_INET6;
4418 ifm->ifa_prefixlen = prefixlen;
4419 ifm->ifa_flags = flags;
4420 ifm->ifa_scope = scope;
4421 ifm->ifa_index = ifindex;
4422}
4423
4424static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4425 unsigned long tstamp, u32 preferred, u32 valid)
4426{
4427 struct ifa_cacheinfo ci;
4428
4429 ci.cstamp = cstamp_delta(cstamp);
4430 ci.tstamp = cstamp_delta(tstamp);
4431 ci.ifa_prefered = preferred;
4432 ci.ifa_valid = valid;
4433
4434 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4435}
4436
4437static inline int rt_scope(int ifa_scope)
4438{
4439 if (ifa_scope & IFA_HOST)
4440 return RT_SCOPE_HOST;
4441 else if (ifa_scope & IFA_LINK)
4442 return RT_SCOPE_LINK;
4443 else if (ifa_scope & IFA_SITE)
4444 return RT_SCOPE_SITE;
4445 else
4446 return RT_SCOPE_UNIVERSE;
4447}
4448
4449static inline int inet6_ifaddr_msgsize(void)
4450{
4451 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4452 + nla_total_size(16) /* IFA_LOCAL */
4453 + nla_total_size(16) /* IFA_ADDRESS */
4454 + nla_total_size(sizeof(struct ifa_cacheinfo))
4455 + nla_total_size(4) /* IFA_FLAGS */;
4456}
4457
4458static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4459 u32 portid, u32 seq, int event, unsigned int flags)
4460{
4461 struct nlmsghdr *nlh;
4462 u32 preferred, valid;
4463
4464 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4465 if (!nlh)
4466 return -EMSGSIZE;
4467
4468 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4469 ifa->idev->dev->ifindex);
4470
4471 if (!((ifa->flags&IFA_F_PERMANENT) &&
4472 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4473 preferred = ifa->prefered_lft;
4474 valid = ifa->valid_lft;
4475 if (preferred != INFINITY_LIFE_TIME) {
4476 long tval = (jiffies - ifa->tstamp)/HZ;
4477 if (preferred > tval)
4478 preferred -= tval;
4479 else
4480 preferred = 0;
4481 if (valid != INFINITY_LIFE_TIME) {
4482 if (valid > tval)
4483 valid -= tval;
4484 else
4485 valid = 0;
4486 }
4487 }
4488 } else {
4489 preferred = INFINITY_LIFE_TIME;
4490 valid = INFINITY_LIFE_TIME;
4491 }
4492
4493 if (!ipv6_addr_any(&ifa->peer_addr)) {
4494 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4495 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4496 goto error;
4497 } else
4498 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4499 goto error;
4500
4501 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4502 goto error;
4503
4504 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4505 goto error;
4506
4507 nlmsg_end(skb, nlh);
4508 return 0;
4509
4510error:
4511 nlmsg_cancel(skb, nlh);
4512 return -EMSGSIZE;
4513}
4514
4515static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4516 u32 portid, u32 seq, int event, u16 flags)
4517{
4518 struct nlmsghdr *nlh;
4519 u8 scope = RT_SCOPE_UNIVERSE;
4520 int ifindex = ifmca->idev->dev->ifindex;
4521
4522 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4523 scope = RT_SCOPE_SITE;
4524
4525 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4526 if (!nlh)
4527 return -EMSGSIZE;
4528
4529 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4530 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4531 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4532 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4533 nlmsg_cancel(skb, nlh);
4534 return -EMSGSIZE;
4535 }
4536
4537 nlmsg_end(skb, nlh);
4538 return 0;
4539}
4540
4541static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4542 u32 portid, u32 seq, int event, unsigned int flags)
4543{
4544 struct nlmsghdr *nlh;
4545 u8 scope = RT_SCOPE_UNIVERSE;
4546 int ifindex = ifaca->aca_idev->dev->ifindex;
4547
4548 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4549 scope = RT_SCOPE_SITE;
4550
4551 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4552 if (!nlh)
4553 return -EMSGSIZE;
4554
4555 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4556 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4557 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4558 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4559 nlmsg_cancel(skb, nlh);
4560 return -EMSGSIZE;
4561 }
4562
4563 nlmsg_end(skb, nlh);
4564 return 0;
4565}
4566
4567enum addr_type_t {
4568 UNICAST_ADDR,
4569 MULTICAST_ADDR,
4570 ANYCAST_ADDR,
4571};
4572
4573/* called with rcu_read_lock() */
4574static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4575 struct netlink_callback *cb, enum addr_type_t type,
4576 int s_ip_idx, int *p_ip_idx)
4577{
4578 struct ifmcaddr6 *ifmca;
4579 struct ifacaddr6 *ifaca;
4580 int err = 1;
4581 int ip_idx = *p_ip_idx;
4582
4583 read_lock_bh(&idev->lock);
4584 switch (type) {
4585 case UNICAST_ADDR: {
4586 struct inet6_ifaddr *ifa;
4587
4588 /* unicast address incl. temp addr */
4589 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4590 if (++ip_idx < s_ip_idx)
4591 continue;
4592 err = inet6_fill_ifaddr(skb, ifa,
4593 NETLINK_CB(cb->skb).portid,
4594 cb->nlh->nlmsg_seq,
4595 RTM_NEWADDR,
4596 NLM_F_MULTI);
4597 if (err < 0)
4598 break;
4599 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4600 }
4601 break;
4602 }
4603 case MULTICAST_ADDR:
4604 /* multicast address */
4605 for (ifmca = idev->mc_list; ifmca;
4606 ifmca = ifmca->next, ip_idx++) {
4607 if (ip_idx < s_ip_idx)
4608 continue;
4609 err = inet6_fill_ifmcaddr(skb, ifmca,
4610 NETLINK_CB(cb->skb).portid,
4611 cb->nlh->nlmsg_seq,
4612 RTM_GETMULTICAST,
4613 NLM_F_MULTI);
4614 if (err < 0)
4615 break;
4616 }
4617 break;
4618 case ANYCAST_ADDR:
4619 /* anycast address */
4620 for (ifaca = idev->ac_list; ifaca;
4621 ifaca = ifaca->aca_next, ip_idx++) {
4622 if (ip_idx < s_ip_idx)
4623 continue;
4624 err = inet6_fill_ifacaddr(skb, ifaca,
4625 NETLINK_CB(cb->skb).portid,
4626 cb->nlh->nlmsg_seq,
4627 RTM_GETANYCAST,
4628 NLM_F_MULTI);
4629 if (err < 0)
4630 break;
4631 }
4632 break;
4633 default:
4634 break;
4635 }
4636 read_unlock_bh(&idev->lock);
4637 *p_ip_idx = ip_idx;
4638 return err;
4639}
4640
4641static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4642 enum addr_type_t type)
4643{
4644 struct net *net = sock_net(skb->sk);
4645 int h, s_h;
4646 int idx, ip_idx;
4647 int s_idx, s_ip_idx;
4648 struct net_device *dev;
4649 struct inet6_dev *idev;
4650 struct hlist_head *head;
4651
4652 s_h = cb->args[0];
4653 s_idx = idx = cb->args[1];
4654 s_ip_idx = ip_idx = cb->args[2];
4655
4656 rcu_read_lock();
4657 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4658 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4659 idx = 0;
4660 head = &net->dev_index_head[h];
4661 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4662 if (idx < s_idx)
4663 goto cont;
4664 if (h > s_h || idx > s_idx)
4665 s_ip_idx = 0;
4666 ip_idx = 0;
4667 idev = __in6_dev_get(dev);
4668 if (!idev)
4669 goto cont;
4670
4671 if (in6_dump_addrs(idev, skb, cb, type,
4672 s_ip_idx, &ip_idx) < 0)
4673 goto done;
4674cont:
4675 idx++;
4676 }
4677 }
4678done:
4679 rcu_read_unlock();
4680 cb->args[0] = h;
4681 cb->args[1] = idx;
4682 cb->args[2] = ip_idx;
4683
4684 return skb->len;
4685}
4686
4687static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4688{
4689 enum addr_type_t type = UNICAST_ADDR;
4690
4691 return inet6_dump_addr(skb, cb, type);
4692}
4693
4694static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4695{
4696 enum addr_type_t type = MULTICAST_ADDR;
4697
4698 return inet6_dump_addr(skb, cb, type);
4699}
4700
4701
4702static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4703{
4704 enum addr_type_t type = ANYCAST_ADDR;
4705
4706 return inet6_dump_addr(skb, cb, type);
4707}
4708
4709static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4710{
4711 struct net *net = sock_net(in_skb->sk);
4712 struct ifaddrmsg *ifm;
4713 struct nlattr *tb[IFA_MAX+1];
4714 struct in6_addr *addr = NULL, *peer;
4715 struct net_device *dev = NULL;
4716 struct inet6_ifaddr *ifa;
4717 struct sk_buff *skb;
4718 int err;
4719
4720 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4721 if (err < 0)
4722 goto errout;
4723
4724 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4725 if (!addr) {
4726 err = -EINVAL;
4727 goto errout;
4728 }
4729
4730 ifm = nlmsg_data(nlh);
4731 if (ifm->ifa_index)
4732 dev = __dev_get_by_index(net, ifm->ifa_index);
4733
4734 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4735 if (!ifa) {
4736 err = -EADDRNOTAVAIL;
4737 goto errout;
4738 }
4739
4740 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4741 if (!skb) {
4742 err = -ENOBUFS;
4743 goto errout_ifa;
4744 }
4745
4746 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4747 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4748 if (err < 0) {
4749 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4750 WARN_ON(err == -EMSGSIZE);
4751 kfree_skb(skb);
4752 goto errout_ifa;
4753 }
4754 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4755errout_ifa:
4756 in6_ifa_put(ifa);
4757errout:
4758 return err;
4759}
4760
4761static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4762{
4763 struct sk_buff *skb;
4764 struct net *net = dev_net(ifa->idev->dev);
4765 int err = -ENOBUFS;
4766
4767 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4768 if (!skb)
4769 goto errout;
4770
4771 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4772 if (err < 0) {
4773 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4774 WARN_ON(err == -EMSGSIZE);
4775 kfree_skb(skb);
4776 goto errout;
4777 }
4778 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4779 return;
4780errout:
4781 if (err < 0)
4782 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4783}
4784
4785static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4786 __s32 *array, int bytes)
4787{
4788 BUG_ON(bytes < (DEVCONF_MAX * 4));
4789
4790 memset(array, 0, bytes);
4791 array[DEVCONF_FORWARDING] = cnf->forwarding;
4792 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4793 array[DEVCONF_MTU6] = cnf->mtu6;
4794 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4795 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4796 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4797 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4798 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4799 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4800 jiffies_to_msecs(cnf->rtr_solicit_interval);
4801 array[DEVCONF_RTR_SOLICIT_DELAY] =
4802 jiffies_to_msecs(cnf->rtr_solicit_delay);
4803 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4804 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4805 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4806 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4807 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4808 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4809 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4810 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4811 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4812 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4813 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4814 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4815 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4816 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4817#ifdef CONFIG_IPV6_ROUTER_PREF
4818 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4819 array[DEVCONF_RTR_PROBE_INTERVAL] =
4820 jiffies_to_msecs(cnf->rtr_probe_interval);
4821#ifdef CONFIG_IPV6_ROUTE_INFO
4822 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4823#endif
4824#endif
4825 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4826 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4827#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4828 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4829 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4830#endif
4831#ifdef CONFIG_IPV6_MROUTE
4832 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4833#endif
4834 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4835 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4836 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4837 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4838 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4839 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4840 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4841 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4842 /* we omit DEVCONF_STABLE_SECRET for now */
4843 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4844 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
4845 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
4846 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
4847}
4848
4849static inline size_t inet6_ifla6_size(void)
4850{
4851 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4852 + nla_total_size(sizeof(struct ifla_cacheinfo))
4853 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4854 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4855 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4856 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4857}
4858
4859static inline size_t inet6_if_nlmsg_size(void)
4860{
4861 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4862 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4863 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4864 + nla_total_size(4) /* IFLA_MTU */
4865 + nla_total_size(4) /* IFLA_LINK */
4866 + nla_total_size(1) /* IFLA_OPERSTATE */
4867 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4868}
4869
4870static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4871 int items, int bytes)
4872{
4873 int i;
4874 int pad = bytes - sizeof(u64) * items;
4875 BUG_ON(pad < 0);
4876
4877 /* Use put_unaligned() because stats may not be aligned for u64. */
4878 put_unaligned(items, &stats[0]);
4879 for (i = 1; i < items; i++)
4880 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4881
4882 memset(&stats[items], 0, pad);
4883}
4884
4885static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4886 int bytes, size_t syncpoff)
4887{
4888 int i, c;
4889 u64 buff[IPSTATS_MIB_MAX];
4890 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4891
4892 BUG_ON(pad < 0);
4893
4894 memset(buff, 0, sizeof(buff));
4895 buff[0] = IPSTATS_MIB_MAX;
4896
4897 for_each_possible_cpu(c) {
4898 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4899 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4900 }
4901
4902 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4903 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4904}
4905
4906static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4907 int bytes)
4908{
4909 switch (attrtype) {
4910 case IFLA_INET6_STATS:
4911 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4912 offsetof(struct ipstats_mib, syncp));
4913 break;
4914 case IFLA_INET6_ICMP6STATS:
4915 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4916 break;
4917 }
4918}
4919
4920static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4921 u32 ext_filter_mask)
4922{
4923 struct nlattr *nla;
4924 struct ifla_cacheinfo ci;
4925
4926 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4927 goto nla_put_failure;
4928 ci.max_reasm_len = IPV6_MAXPLEN;
4929 ci.tstamp = cstamp_delta(idev->tstamp);
4930 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4931 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4932 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4933 goto nla_put_failure;
4934 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4935 if (!nla)
4936 goto nla_put_failure;
4937 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4938
4939 /* XXX - MC not implemented */
4940
4941 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4942 return 0;
4943
4944 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4945 if (!nla)
4946 goto nla_put_failure;
4947 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4948
4949 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4950 if (!nla)
4951 goto nla_put_failure;
4952 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4953
4954 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4955 if (!nla)
4956 goto nla_put_failure;
4957
4958 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4959 goto nla_put_failure;
4960
4961 read_lock_bh(&idev->lock);
4962 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4963 read_unlock_bh(&idev->lock);
4964
4965 return 0;
4966
4967nla_put_failure:
4968 return -EMSGSIZE;
4969}
4970
4971static size_t inet6_get_link_af_size(const struct net_device *dev,
4972 u32 ext_filter_mask)
4973{
4974 if (!__in6_dev_get(dev))
4975 return 0;
4976
4977 return inet6_ifla6_size();
4978}
4979
4980static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4981 u32 ext_filter_mask)
4982{
4983 struct inet6_dev *idev = __in6_dev_get(dev);
4984
4985 if (!idev)
4986 return -ENODATA;
4987
4988 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
4989 return -EMSGSIZE;
4990
4991 return 0;
4992}
4993
4994static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4995{
4996 struct inet6_ifaddr *ifp;
4997 struct net_device *dev = idev->dev;
4998 bool update_rs = false;
4999 struct in6_addr ll_addr;
5000
5001 ASSERT_RTNL();
5002
5003 if (!token)
5004 return -EINVAL;
5005 if (ipv6_addr_any(token))
5006 return -EINVAL;
5007 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5008 return -EINVAL;
5009 if (!ipv6_accept_ra(idev))
5010 return -EINVAL;
5011 if (idev->cnf.rtr_solicits <= 0)
5012 return -EINVAL;
5013
5014 write_lock_bh(&idev->lock);
5015
5016 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5017 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5018
5019 write_unlock_bh(&idev->lock);
5020
5021 if (!idev->dead && (idev->if_flags & IF_READY) &&
5022 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5023 IFA_F_OPTIMISTIC)) {
5024
5025 /* If we're not ready, then normal ifup will take care
5026 * of this. Otherwise, we need to request our rs here.
5027 */
5028 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5029 update_rs = true;
5030 }
5031
5032 write_lock_bh(&idev->lock);
5033
5034 if (update_rs) {
5035 idev->if_flags |= IF_RS_SENT;
5036 idev->rs_probes = 1;
5037 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
5038 }
5039
5040 /* Well, that's kinda nasty ... */
5041 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5042 spin_lock(&ifp->lock);
5043 if (ifp->tokenized) {
5044 ifp->valid_lft = 0;
5045 ifp->prefered_lft = 0;
5046 }
5047 spin_unlock(&ifp->lock);
5048 }
5049
5050 write_unlock_bh(&idev->lock);
5051 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5052 addrconf_verify_rtnl();
5053 return 0;
5054}
5055
5056static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5057 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5058 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5059};
5060
5061static int inet6_validate_link_af(const struct net_device *dev,
5062 const struct nlattr *nla)
5063{
5064 struct nlattr *tb[IFLA_INET6_MAX + 1];
5065
5066 if (dev && !__in6_dev_get(dev))
5067 return -EAFNOSUPPORT;
5068
5069 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5070}
5071
5072static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5073{
5074 int err = -EINVAL;
5075 struct inet6_dev *idev = __in6_dev_get(dev);
5076 struct nlattr *tb[IFLA_INET6_MAX + 1];
5077
5078 if (!idev)
5079 return -EAFNOSUPPORT;
5080
5081 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5082 BUG();
5083
5084 if (tb[IFLA_INET6_TOKEN]) {
5085 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5086 if (err)
5087 return err;
5088 }
5089
5090 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5091 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5092
5093 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5094 mode != IN6_ADDR_GEN_MODE_NONE &&
5095 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5096 mode != IN6_ADDR_GEN_MODE_RANDOM)
5097 return -EINVAL;
5098
5099 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5100 !idev->cnf.stable_secret.initialized &&
5101 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
5102 return -EINVAL;
5103
5104 idev->addr_gen_mode = mode;
5105 err = 0;
5106 }
5107
5108 return err;
5109}
5110
5111static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5112 u32 portid, u32 seq, int event, unsigned int flags)
5113{
5114 struct net_device *dev = idev->dev;
5115 struct ifinfomsg *hdr;
5116 struct nlmsghdr *nlh;
5117 void *protoinfo;
5118
5119 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5120 if (!nlh)
5121 return -EMSGSIZE;
5122
5123 hdr = nlmsg_data(nlh);
5124 hdr->ifi_family = AF_INET6;
5125 hdr->__ifi_pad = 0;
5126 hdr->ifi_type = dev->type;
5127 hdr->ifi_index = dev->ifindex;
5128 hdr->ifi_flags = dev_get_flags(dev);
5129 hdr->ifi_change = 0;
5130
5131 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5132 (dev->addr_len &&
5133 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5134 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5135 (dev->ifindex != dev_get_iflink(dev) &&
5136 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5137 nla_put_u8(skb, IFLA_OPERSTATE,
5138 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5139 goto nla_put_failure;
5140 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5141 if (!protoinfo)
5142 goto nla_put_failure;
5143
5144 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5145 goto nla_put_failure;
5146
5147 nla_nest_end(skb, protoinfo);
5148 nlmsg_end(skb, nlh);
5149 return 0;
5150
5151nla_put_failure:
5152 nlmsg_cancel(skb, nlh);
5153 return -EMSGSIZE;
5154}
5155
5156static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5157{
5158 struct net *net = sock_net(skb->sk);
5159 int h, s_h;
5160 int idx = 0, s_idx;
5161 struct net_device *dev;
5162 struct inet6_dev *idev;
5163 struct hlist_head *head;
5164
5165 s_h = cb->args[0];
5166 s_idx = cb->args[1];
5167
5168 rcu_read_lock();
5169 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5170 idx = 0;
5171 head = &net->dev_index_head[h];
5172 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5173 if (idx < s_idx)
5174 goto cont;
5175 idev = __in6_dev_get(dev);
5176 if (!idev)
5177 goto cont;
5178 if (inet6_fill_ifinfo(skb, idev,
5179 NETLINK_CB(cb->skb).portid,
5180 cb->nlh->nlmsg_seq,
5181 RTM_NEWLINK, NLM_F_MULTI) < 0)
5182 goto out;
5183cont:
5184 idx++;
5185 }
5186 }
5187out:
5188 rcu_read_unlock();
5189 cb->args[1] = idx;
5190 cb->args[0] = h;
5191
5192 return skb->len;
5193}
5194
5195void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5196{
5197 struct sk_buff *skb;
5198 struct net *net = dev_net(idev->dev);
5199 int err = -ENOBUFS;
5200
5201 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5202 if (!skb)
5203 goto errout;
5204
5205 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5206 if (err < 0) {
5207 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5208 WARN_ON(err == -EMSGSIZE);
5209 kfree_skb(skb);
5210 goto errout;
5211 }
5212 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5213 return;
5214errout:
5215 if (err < 0)
5216 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5217}
5218
5219static inline size_t inet6_prefix_nlmsg_size(void)
5220{
5221 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5222 + nla_total_size(sizeof(struct in6_addr))
5223 + nla_total_size(sizeof(struct prefix_cacheinfo));
5224}
5225
5226static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5227 struct prefix_info *pinfo, u32 portid, u32 seq,
5228 int event, unsigned int flags)
5229{
5230 struct prefixmsg *pmsg;
5231 struct nlmsghdr *nlh;
5232 struct prefix_cacheinfo ci;
5233
5234 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5235 if (!nlh)
5236 return -EMSGSIZE;
5237
5238 pmsg = nlmsg_data(nlh);
5239 pmsg->prefix_family = AF_INET6;
5240 pmsg->prefix_pad1 = 0;
5241 pmsg->prefix_pad2 = 0;
5242 pmsg->prefix_ifindex = idev->dev->ifindex;
5243 pmsg->prefix_len = pinfo->prefix_len;
5244 pmsg->prefix_type = pinfo->type;
5245 pmsg->prefix_pad3 = 0;
5246 pmsg->prefix_flags = 0;
5247 if (pinfo->onlink)
5248 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5249 if (pinfo->autoconf)
5250 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5251
5252 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5253 goto nla_put_failure;
5254 ci.preferred_time = ntohl(pinfo->prefered);
5255 ci.valid_time = ntohl(pinfo->valid);
5256 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5257 goto nla_put_failure;
5258 nlmsg_end(skb, nlh);
5259 return 0;
5260
5261nla_put_failure:
5262 nlmsg_cancel(skb, nlh);
5263 return -EMSGSIZE;
5264}
5265
5266static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5267 struct prefix_info *pinfo)
5268{
5269 struct sk_buff *skb;
5270 struct net *net = dev_net(idev->dev);
5271 int err = -ENOBUFS;
5272
5273 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5274 if (!skb)
5275 goto errout;
5276
5277 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5278 if (err < 0) {
5279 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5280 WARN_ON(err == -EMSGSIZE);
5281 kfree_skb(skb);
5282 goto errout;
5283 }
5284 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5285 return;
5286errout:
5287 if (err < 0)
5288 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5289}
5290
5291static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5292{
5293 struct net *net = dev_net(ifp->idev->dev);
5294
5295 if (event)
5296 ASSERT_RTNL();
5297
5298 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5299
5300 switch (event) {
5301 case RTM_NEWADDR:
5302 /*
5303 * If the address was optimistic
5304 * we inserted the route at the start of
5305 * our DAD process, so we don't need
5306 * to do it again
5307 */
5308 if (!(ifp->rt->rt6i_node))
5309 ip6_ins_rt(ifp->rt);
5310 if (ifp->idev->cnf.forwarding)
5311 addrconf_join_anycast(ifp);
5312 if (!ipv6_addr_any(&ifp->peer_addr))
5313 addrconf_prefix_route(&ifp->peer_addr, 128,
5314 ifp->idev->dev, 0, 0);
5315 break;
5316 case RTM_DELADDR:
5317 if (ifp->idev->cnf.forwarding)
5318 addrconf_leave_anycast(ifp);
5319 addrconf_leave_solict(ifp->idev, &ifp->addr);
5320 if (!ipv6_addr_any(&ifp->peer_addr)) {
5321 struct rt6_info *rt;
5322
5323 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5324 ifp->idev->dev, 0, 0);
5325 if (rt)
5326 ip6_del_rt(rt);
5327 }
5328 if (ifp->rt) {
5329 dst_hold(&ifp->rt->dst);
5330 ip6_del_rt(ifp->rt);
5331 }
5332 rt_genid_bump_ipv6(net);
5333 break;
5334 }
5335 atomic_inc(&net->ipv6.dev_addr_genid);
5336}
5337
5338static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5339{
5340 rcu_read_lock_bh();
5341 if (likely(ifp->idev->dead == 0))
5342 __ipv6_ifa_notify(event, ifp);
5343 rcu_read_unlock_bh();
5344}
5345
5346#ifdef CONFIG_SYSCTL
5347
5348static
5349int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5350 void __user *buffer, size_t *lenp, loff_t *ppos)
5351{
5352 int *valp = ctl->data;
5353 int val = *valp;
5354 loff_t pos = *ppos;
5355 struct ctl_table lctl;
5356 int ret;
5357
5358 /*
5359 * ctl->data points to idev->cnf.forwarding, we should
5360 * not modify it until we get the rtnl lock.
5361 */
5362 lctl = *ctl;
5363 lctl.data = &val;
5364
5365 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5366
5367 if (write)
5368 ret = addrconf_fixup_forwarding(ctl, valp, val);
5369 if (ret)
5370 *ppos = pos;
5371 return ret;
5372}
5373
5374static
5375int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write,
5376 void __user *buffer, size_t *lenp, loff_t *ppos)
5377{
5378 struct ctl_table lctl;
5379 int min_hl = 1, max_hl = 255;
5380
5381 lctl = *ctl;
5382 lctl.extra1 = &min_hl;
5383 lctl.extra2 = &max_hl;
5384
5385 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5386}
5387
5388static
5389int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5390 void __user *buffer, size_t *lenp, loff_t *ppos)
5391{
5392 struct inet6_dev *idev = ctl->extra1;
5393 int min_mtu = IPV6_MIN_MTU;
5394 struct ctl_table lctl;
5395
5396 lctl = *ctl;
5397 lctl.extra1 = &min_mtu;
5398 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5399
5400 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5401}
5402
5403static void dev_disable_change(struct inet6_dev *idev)
5404{
5405 struct netdev_notifier_info info;
5406
5407 if (!idev || !idev->dev)
5408 return;
5409
5410 netdev_notifier_info_init(&info, idev->dev);
5411 if (idev->cnf.disable_ipv6)
5412 addrconf_notify(NULL, NETDEV_DOWN, &info);
5413 else
5414 addrconf_notify(NULL, NETDEV_UP, &info);
5415}
5416
5417static void addrconf_disable_change(struct net *net, __s32 newf)
5418{
5419 struct net_device *dev;
5420 struct inet6_dev *idev;
5421
5422 rcu_read_lock();
5423 for_each_netdev_rcu(net, dev) {
5424 idev = __in6_dev_get(dev);
5425 if (idev) {
5426 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5427 idev->cnf.disable_ipv6 = newf;
5428 if (changed)
5429 dev_disable_change(idev);
5430 }
5431 }
5432 rcu_read_unlock();
5433}
5434
5435static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5436{
5437 struct net *net;
5438 int old;
5439
5440 if (!rtnl_trylock())
5441 return restart_syscall();
5442
5443 net = (struct net *)table->extra2;
5444 old = *p;
5445 *p = newf;
5446
5447 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5448 rtnl_unlock();
5449 return 0;
5450 }
5451
5452 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5453 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5454 addrconf_disable_change(net, newf);
5455 } else if ((!newf) ^ (!old))
5456 dev_disable_change((struct inet6_dev *)table->extra1);
5457
5458 rtnl_unlock();
5459 return 0;
5460}
5461
5462static
5463int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5464 void __user *buffer, size_t *lenp, loff_t *ppos)
5465{
5466 int *valp = ctl->data;
5467 int val = *valp;
5468 loff_t pos = *ppos;
5469 struct ctl_table lctl;
5470 int ret;
5471
5472 /*
5473 * ctl->data points to idev->cnf.disable_ipv6, we should
5474 * not modify it until we get the rtnl lock.
5475 */
5476 lctl = *ctl;
5477 lctl.data = &val;
5478
5479 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5480
5481 if (write)
5482 ret = addrconf_disable_ipv6(ctl, valp, val);
5483 if (ret)
5484 *ppos = pos;
5485 return ret;
5486}
5487
5488static
5489int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5490 void __user *buffer, size_t *lenp, loff_t *ppos)
5491{
5492 int *valp = ctl->data;
5493 int ret;
5494 int old, new;
5495
5496 old = *valp;
5497 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5498 new = *valp;
5499
5500 if (write && old != new) {
5501 struct net *net = ctl->extra2;
5502
5503 if (!rtnl_trylock())
5504 return restart_syscall();
5505
5506 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5507 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5508 NETCONFA_IFINDEX_DEFAULT,
5509 net->ipv6.devconf_dflt);
5510 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5511 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5512 NETCONFA_IFINDEX_ALL,
5513 net->ipv6.devconf_all);
5514 else {
5515 struct inet6_dev *idev = ctl->extra1;
5516
5517 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5518 idev->dev->ifindex,
5519 &idev->cnf);
5520 }
5521 rtnl_unlock();
5522 }
5523
5524 return ret;
5525}
5526
5527static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5528 void __user *buffer, size_t *lenp,
5529 loff_t *ppos)
5530{
5531 int err;
5532 struct in6_addr addr;
5533 char str[IPV6_MAX_STRLEN];
5534 struct ctl_table lctl = *ctl;
5535 struct net *net = ctl->extra2;
5536 struct ipv6_stable_secret *secret = ctl->data;
5537
5538 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5539 return -EIO;
5540
5541 lctl.maxlen = IPV6_MAX_STRLEN;
5542 lctl.data = str;
5543
5544 if (!rtnl_trylock())
5545 return restart_syscall();
5546
5547 if (!write && !secret->initialized) {
5548 err = -EIO;
5549 goto out;
5550 }
5551
5552 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5553 if (err >= sizeof(str)) {
5554 err = -EIO;
5555 goto out;
5556 }
5557
5558 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5559 if (err || !write)
5560 goto out;
5561
5562 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5563 err = -EIO;
5564 goto out;
5565 }
5566
5567 secret->initialized = true;
5568 secret->secret = addr;
5569
5570 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5571 struct net_device *dev;
5572
5573 for_each_netdev(net, dev) {
5574 struct inet6_dev *idev = __in6_dev_get(dev);
5575
5576 if (idev) {
5577 idev->addr_gen_mode =
5578 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5579 }
5580 }
5581 } else {
5582 struct inet6_dev *idev = ctl->extra1;
5583
5584 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5585 }
5586
5587out:
5588 rtnl_unlock();
5589
5590 return err;
5591}
5592
5593static
5594int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5595 int write,
5596 void __user *buffer,
5597 size_t *lenp,
5598 loff_t *ppos)
5599{
5600 int *valp = ctl->data;
5601 int val = *valp;
5602 loff_t pos = *ppos;
5603 struct ctl_table lctl;
5604 int ret;
5605
5606 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5607 * we should not modify it until we get the rtnl lock.
5608 */
5609 lctl = *ctl;
5610 lctl.data = &val;
5611
5612 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5613
5614 if (write)
5615 ret = addrconf_fixup_linkdown(ctl, valp, val);
5616 if (ret)
5617 *ppos = pos;
5618 return ret;
5619}
5620
5621static struct addrconf_sysctl_table
5622{
5623 struct ctl_table_header *sysctl_header;
5624 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5625} addrconf_sysctl __read_mostly = {
5626 .sysctl_header = NULL,
5627 .addrconf_vars = {
5628 {
5629 .procname = "forwarding",
5630 .data = &ipv6_devconf.forwarding,
5631 .maxlen = sizeof(int),
5632 .mode = 0644,
5633 .proc_handler = addrconf_sysctl_forward,
5634 },
5635 {
5636 .procname = "hop_limit",
5637 .data = &ipv6_devconf.hop_limit,
5638 .maxlen = sizeof(int),
5639 .mode = 0644,
5640 .proc_handler = addrconf_sysctl_hop_limit,
5641 },
5642 {
5643 .procname = "mtu",
5644 .data = &ipv6_devconf.mtu6,
5645 .maxlen = sizeof(int),
5646 .mode = 0644,
5647 .proc_handler = addrconf_sysctl_mtu,
5648 },
5649 {
5650 .procname = "accept_ra",
5651 .data = &ipv6_devconf.accept_ra,
5652 .maxlen = sizeof(int),
5653 .mode = 0644,
5654 .proc_handler = proc_dointvec,
5655 },
5656 {
5657 .procname = "accept_redirects",
5658 .data = &ipv6_devconf.accept_redirects,
5659 .maxlen = sizeof(int),
5660 .mode = 0644,
5661 .proc_handler = proc_dointvec,
5662 },
5663 {
5664 .procname = "autoconf",
5665 .data = &ipv6_devconf.autoconf,
5666 .maxlen = sizeof(int),
5667 .mode = 0644,
5668 .proc_handler = proc_dointvec,
5669 },
5670 {
5671 .procname = "dad_transmits",
5672 .data = &ipv6_devconf.dad_transmits,
5673 .maxlen = sizeof(int),
5674 .mode = 0644,
5675 .proc_handler = proc_dointvec,
5676 },
5677 {
5678 .procname = "router_solicitations",
5679 .data = &ipv6_devconf.rtr_solicits,
5680 .maxlen = sizeof(int),
5681 .mode = 0644,
5682 .proc_handler = proc_dointvec,
5683 },
5684 {
5685 .procname = "router_solicitation_interval",
5686 .data = &ipv6_devconf.rtr_solicit_interval,
5687 .maxlen = sizeof(int),
5688 .mode = 0644,
5689 .proc_handler = proc_dointvec_jiffies,
5690 },
5691 {
5692 .procname = "router_solicitation_delay",
5693 .data = &ipv6_devconf.rtr_solicit_delay,
5694 .maxlen = sizeof(int),
5695 .mode = 0644,
5696 .proc_handler = proc_dointvec_jiffies,
5697 },
5698 {
5699 .procname = "force_mld_version",
5700 .data = &ipv6_devconf.force_mld_version,
5701 .maxlen = sizeof(int),
5702 .mode = 0644,
5703 .proc_handler = proc_dointvec,
5704 },
5705 {
5706 .procname = "mldv1_unsolicited_report_interval",
5707 .data =
5708 &ipv6_devconf.mldv1_unsolicited_report_interval,
5709 .maxlen = sizeof(int),
5710 .mode = 0644,
5711 .proc_handler = proc_dointvec_ms_jiffies,
5712 },
5713 {
5714 .procname = "mldv2_unsolicited_report_interval",
5715 .data =
5716 &ipv6_devconf.mldv2_unsolicited_report_interval,
5717 .maxlen = sizeof(int),
5718 .mode = 0644,
5719 .proc_handler = proc_dointvec_ms_jiffies,
5720 },
5721 {
5722 .procname = "use_tempaddr",
5723 .data = &ipv6_devconf.use_tempaddr,
5724 .maxlen = sizeof(int),
5725 .mode = 0644,
5726 .proc_handler = proc_dointvec,
5727 },
5728 {
5729 .procname = "temp_valid_lft",
5730 .data = &ipv6_devconf.temp_valid_lft,
5731 .maxlen = sizeof(int),
5732 .mode = 0644,
5733 .proc_handler = proc_dointvec,
5734 },
5735 {
5736 .procname = "temp_prefered_lft",
5737 .data = &ipv6_devconf.temp_prefered_lft,
5738 .maxlen = sizeof(int),
5739 .mode = 0644,
5740 .proc_handler = proc_dointvec,
5741 },
5742 {
5743 .procname = "regen_max_retry",
5744 .data = &ipv6_devconf.regen_max_retry,
5745 .maxlen = sizeof(int),
5746 .mode = 0644,
5747 .proc_handler = proc_dointvec,
5748 },
5749 {
5750 .procname = "max_desync_factor",
5751 .data = &ipv6_devconf.max_desync_factor,
5752 .maxlen = sizeof(int),
5753 .mode = 0644,
5754 .proc_handler = proc_dointvec,
5755 },
5756 {
5757 .procname = "max_addresses",
5758 .data = &ipv6_devconf.max_addresses,
5759 .maxlen = sizeof(int),
5760 .mode = 0644,
5761 .proc_handler = proc_dointvec,
5762 },
5763 {
5764 .procname = "accept_ra_defrtr",
5765 .data = &ipv6_devconf.accept_ra_defrtr,
5766 .maxlen = sizeof(int),
5767 .mode = 0644,
5768 .proc_handler = proc_dointvec,
5769 },
5770 {
5771 .procname = "accept_ra_min_hop_limit",
5772 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5773 .maxlen = sizeof(int),
5774 .mode = 0644,
5775 .proc_handler = proc_dointvec,
5776 },
5777 {
5778 .procname = "accept_ra_pinfo",
5779 .data = &ipv6_devconf.accept_ra_pinfo,
5780 .maxlen = sizeof(int),
5781 .mode = 0644,
5782 .proc_handler = proc_dointvec,
5783 },
5784#ifdef CONFIG_IPV6_ROUTER_PREF
5785 {
5786 .procname = "accept_ra_rtr_pref",
5787 .data = &ipv6_devconf.accept_ra_rtr_pref,
5788 .maxlen = sizeof(int),
5789 .mode = 0644,
5790 .proc_handler = proc_dointvec,
5791 },
5792 {
5793 .procname = "router_probe_interval",
5794 .data = &ipv6_devconf.rtr_probe_interval,
5795 .maxlen = sizeof(int),
5796 .mode = 0644,
5797 .proc_handler = proc_dointvec_jiffies,
5798 },
5799#ifdef CONFIG_IPV6_ROUTE_INFO
5800 {
5801 .procname = "accept_ra_rt_info_max_plen",
5802 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5803 .maxlen = sizeof(int),
5804 .mode = 0644,
5805 .proc_handler = proc_dointvec,
5806 },
5807#endif
5808#endif
5809 {
5810 .procname = "proxy_ndp",
5811 .data = &ipv6_devconf.proxy_ndp,
5812 .maxlen = sizeof(int),
5813 .mode = 0644,
5814 .proc_handler = addrconf_sysctl_proxy_ndp,
5815 },
5816 {
5817 .procname = "accept_source_route",
5818 .data = &ipv6_devconf.accept_source_route,
5819 .maxlen = sizeof(int),
5820 .mode = 0644,
5821 .proc_handler = proc_dointvec,
5822 },
5823#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5824 {
5825 .procname = "optimistic_dad",
5826 .data = &ipv6_devconf.optimistic_dad,
5827 .maxlen = sizeof(int),
5828 .mode = 0644,
5829 .proc_handler = proc_dointvec,
5830
5831 },
5832 {
5833 .procname = "use_optimistic",
5834 .data = &ipv6_devconf.use_optimistic,
5835 .maxlen = sizeof(int),
5836 .mode = 0644,
5837 .proc_handler = proc_dointvec,
5838
5839 },
5840#endif
5841#ifdef CONFIG_IPV6_MROUTE
5842 {
5843 .procname = "mc_forwarding",
5844 .data = &ipv6_devconf.mc_forwarding,
5845 .maxlen = sizeof(int),
5846 .mode = 0444,
5847 .proc_handler = proc_dointvec,
5848 },
5849#endif
5850 {
5851 .procname = "disable_ipv6",
5852 .data = &ipv6_devconf.disable_ipv6,
5853 .maxlen = sizeof(int),
5854 .mode = 0644,
5855 .proc_handler = addrconf_sysctl_disable,
5856 },
5857 {
5858 .procname = "accept_dad",
5859 .data = &ipv6_devconf.accept_dad,
5860 .maxlen = sizeof(int),
5861 .mode = 0644,
5862 .proc_handler = proc_dointvec,
5863 },
5864 {
5865 .procname = "force_tllao",
5866 .data = &ipv6_devconf.force_tllao,
5867 .maxlen = sizeof(int),
5868 .mode = 0644,
5869 .proc_handler = proc_dointvec
5870 },
5871 {
5872 .procname = "ndisc_notify",
5873 .data = &ipv6_devconf.ndisc_notify,
5874 .maxlen = sizeof(int),
5875 .mode = 0644,
5876 .proc_handler = proc_dointvec
5877 },
5878 {
5879 .procname = "suppress_frag_ndisc",
5880 .data = &ipv6_devconf.suppress_frag_ndisc,
5881 .maxlen = sizeof(int),
5882 .mode = 0644,
5883 .proc_handler = proc_dointvec
5884 },
5885 {
5886 .procname = "accept_ra_from_local",
5887 .data = &ipv6_devconf.accept_ra_from_local,
5888 .maxlen = sizeof(int),
5889 .mode = 0644,
5890 .proc_handler = proc_dointvec,
5891 },
5892 {
5893 .procname = "accept_ra_mtu",
5894 .data = &ipv6_devconf.accept_ra_mtu,
5895 .maxlen = sizeof(int),
5896 .mode = 0644,
5897 .proc_handler = proc_dointvec,
5898 },
5899 {
5900 .procname = "stable_secret",
5901 .data = &ipv6_devconf.stable_secret,
5902 .maxlen = IPV6_MAX_STRLEN,
5903 .mode = 0600,
5904 .proc_handler = addrconf_sysctl_stable_secret,
5905 },
5906 {
5907 .procname = "use_oif_addrs_only",
5908 .data = &ipv6_devconf.use_oif_addrs_only,
5909 .maxlen = sizeof(int),
5910 .mode = 0644,
5911 .proc_handler = proc_dointvec,
5912 },
5913 {
5914 .procname = "ignore_routes_with_linkdown",
5915 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5916 .maxlen = sizeof(int),
5917 .mode = 0644,
5918 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
5919 },
5920 {
5921 .procname = "drop_unicast_in_l2_multicast",
5922 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
5923 .maxlen = sizeof(int),
5924 .mode = 0644,
5925 .proc_handler = proc_dointvec,
5926 },
5927 {
5928 .procname = "drop_unsolicited_na",
5929 .data = &ipv6_devconf.drop_unsolicited_na,
5930 .maxlen = sizeof(int),
5931 .mode = 0644,
5932 .proc_handler = proc_dointvec,
5933 },
5934 {
5935 .procname = "keep_addr_on_down",
5936 .data = &ipv6_devconf.keep_addr_on_down,
5937 .maxlen = sizeof(int),
5938 .mode = 0644,
5939 .proc_handler = proc_dointvec,
5940
5941 },
5942 {
5943 /* sentinel */
5944 }
5945 },
5946};
5947
5948static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5949 struct inet6_dev *idev, struct ipv6_devconf *p)
5950{
5951 int i;
5952 struct addrconf_sysctl_table *t;
5953 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5954
5955 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5956 if (!t)
5957 goto out;
5958
5959 for (i = 0; t->addrconf_vars[i].data; i++) {
5960 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5961 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5962 t->addrconf_vars[i].extra2 = net;
5963 }
5964
5965 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5966
5967 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5968 if (!t->sysctl_header)
5969 goto free;
5970
5971 p->sysctl = t;
5972 return 0;
5973
5974free:
5975 kfree(t);
5976out:
5977 return -ENOBUFS;
5978}
5979
5980static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5981{
5982 struct addrconf_sysctl_table *t;
5983
5984 if (!p->sysctl)
5985 return;
5986
5987 t = p->sysctl;
5988 p->sysctl = NULL;
5989 unregister_net_sysctl_table(t->sysctl_header);
5990 kfree(t);
5991}
5992
5993static int addrconf_sysctl_register(struct inet6_dev *idev)
5994{
5995 int err;
5996
5997 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5998 return -EINVAL;
5999
6000 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6001 &ndisc_ifinfo_sysctl_change);
6002 if (err)
6003 return err;
6004 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6005 idev, &idev->cnf);
6006 if (err)
6007 neigh_sysctl_unregister(idev->nd_parms);
6008
6009 return err;
6010}
6011
6012static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6013{
6014 __addrconf_sysctl_unregister(&idev->cnf);
6015 neigh_sysctl_unregister(idev->nd_parms);
6016}
6017
6018
6019#endif
6020
6021static int __net_init addrconf_init_net(struct net *net)
6022{
6023 int err = -ENOMEM;
6024 struct ipv6_devconf *all, *dflt;
6025
6026 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6027 if (!all)
6028 goto err_alloc_all;
6029
6030 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6031 if (!dflt)
6032 goto err_alloc_dflt;
6033
6034 /* these will be inherited by all namespaces */
6035 dflt->autoconf = ipv6_defaults.autoconf;
6036 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6037
6038 dflt->stable_secret.initialized = false;
6039 all->stable_secret.initialized = false;
6040
6041 net->ipv6.devconf_all = all;
6042 net->ipv6.devconf_dflt = dflt;
6043
6044#ifdef CONFIG_SYSCTL
6045 err = __addrconf_sysctl_register(net, "all", NULL, all);
6046 if (err < 0)
6047 goto err_reg_all;
6048
6049 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6050 if (err < 0)
6051 goto err_reg_dflt;
6052#endif
6053 return 0;
6054
6055#ifdef CONFIG_SYSCTL
6056err_reg_dflt:
6057 __addrconf_sysctl_unregister(all);
6058err_reg_all:
6059 kfree(dflt);
6060#endif
6061err_alloc_dflt:
6062 kfree(all);
6063err_alloc_all:
6064 return err;
6065}
6066
6067static void __net_exit addrconf_exit_net(struct net *net)
6068{
6069#ifdef CONFIG_SYSCTL
6070 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6071 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6072#endif
6073 kfree(net->ipv6.devconf_dflt);
6074 kfree(net->ipv6.devconf_all);
6075}
6076
6077static struct pernet_operations addrconf_ops = {
6078 .init = addrconf_init_net,
6079 .exit = addrconf_exit_net,
6080};
6081
6082static struct rtnl_af_ops inet6_ops __read_mostly = {
6083 .family = AF_INET6,
6084 .fill_link_af = inet6_fill_link_af,
6085 .get_link_af_size = inet6_get_link_af_size,
6086 .validate_link_af = inet6_validate_link_af,
6087 .set_link_af = inet6_set_link_af,
6088};
6089
6090/*
6091 * Init / cleanup code
6092 */
6093
6094int __init addrconf_init(void)
6095{
6096 struct inet6_dev *idev;
6097 int i, err;
6098
6099 err = ipv6_addr_label_init();
6100 if (err < 0) {
6101 pr_crit("%s: cannot initialize default policy table: %d\n",
6102 __func__, err);
6103 goto out;
6104 }
6105
6106 err = register_pernet_subsys(&addrconf_ops);
6107 if (err < 0)
6108 goto out_addrlabel;
6109
6110 addrconf_wq = create_workqueue("ipv6_addrconf");
6111 if (!addrconf_wq) {
6112 err = -ENOMEM;
6113 goto out_nowq;
6114 }
6115
6116 /* The addrconf netdev notifier requires that loopback_dev
6117 * has it's ipv6 private information allocated and setup
6118 * before it can bring up and give link-local addresses
6119 * to other devices which are up.
6120 *
6121 * Unfortunately, loopback_dev is not necessarily the first
6122 * entry in the global dev_base list of net devices. In fact,
6123 * it is likely to be the very last entry on that list.
6124 * So this causes the notifier registry below to try and
6125 * give link-local addresses to all devices besides loopback_dev
6126 * first, then loopback_dev, which cases all the non-loopback_dev
6127 * devices to fail to get a link-local address.
6128 *
6129 * So, as a temporary fix, allocate the ipv6 structure for
6130 * loopback_dev first by hand.
6131 * Longer term, all of the dependencies ipv6 has upon the loopback
6132 * device and it being up should be removed.
6133 */
6134 rtnl_lock();
6135 idev = ipv6_add_dev(init_net.loopback_dev);
6136 rtnl_unlock();
6137 if (IS_ERR(idev)) {
6138 err = PTR_ERR(idev);
6139 goto errlo;
6140 }
6141
6142 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6143 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6144
6145 register_netdevice_notifier(&ipv6_dev_notf);
6146
6147 addrconf_verify();
6148
6149 rtnl_af_register(&inet6_ops);
6150
6151 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6152 NULL);
6153 if (err < 0)
6154 goto errout;
6155
6156 /* Only the first call to __rtnl_register can fail */
6157 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6158 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6159 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6160 inet6_dump_ifaddr, NULL);
6161 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6162 inet6_dump_ifmcaddr, NULL);
6163 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6164 inet6_dump_ifacaddr, NULL);
6165 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6166 inet6_netconf_dump_devconf, NULL);
6167
6168 ipv6_addr_label_rtnl_register();
6169
6170 return 0;
6171errout:
6172 rtnl_af_unregister(&inet6_ops);
6173 unregister_netdevice_notifier(&ipv6_dev_notf);
6174errlo:
6175 destroy_workqueue(addrconf_wq);
6176out_nowq:
6177 unregister_pernet_subsys(&addrconf_ops);
6178out_addrlabel:
6179 ipv6_addr_label_cleanup();
6180out:
6181 return err;
6182}
6183
6184void addrconf_cleanup(void)
6185{
6186 struct net_device *dev;
6187 int i;
6188
6189 unregister_netdevice_notifier(&ipv6_dev_notf);
6190 unregister_pernet_subsys(&addrconf_ops);
6191 ipv6_addr_label_cleanup();
6192
6193 rtnl_lock();
6194
6195 __rtnl_af_unregister(&inet6_ops);
6196
6197 /* clean dev list */
6198 for_each_netdev(&init_net, dev) {
6199 if (__in6_dev_get(dev) == NULL)
6200 continue;
6201 addrconf_ifdown(dev, 1);
6202 }
6203 addrconf_ifdown(init_net.loopback_dev, 2);
6204
6205 /*
6206 * Check hash table.
6207 */
6208 spin_lock_bh(&addrconf_hash_lock);
6209 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6210 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6211 spin_unlock_bh(&addrconf_hash_lock);
6212 cancel_delayed_work(&addr_chk_work);
6213 rtnl_unlock();
6214
6215 destroy_workqueue(addrconf_wq);
6216}
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_min_advance = REGEN_MIN_ADVANCE,
199 .regen_max_retry = REGEN_MAX_RETRY,
200 .max_desync_factor = MAX_DESYNC_FACTOR,
201 .max_addresses = IPV6_MAX_ADDRESSES,
202 .accept_ra_defrtr = 1,
203 .ra_defrtr_metric = IP6_RT_PRIO_USER,
204 .accept_ra_from_local = 0,
205 .accept_ra_min_hop_limit= 1,
206 .accept_ra_min_lft = 0,
207 .accept_ra_pinfo = 1,
208#ifdef CONFIG_IPV6_ROUTER_PREF
209 .accept_ra_rtr_pref = 1,
210 .rtr_probe_interval = 60 * HZ,
211#ifdef CONFIG_IPV6_ROUTE_INFO
212 .accept_ra_rt_info_min_plen = 0,
213 .accept_ra_rt_info_max_plen = 0,
214#endif
215#endif
216 .proxy_ndp = 0,
217 .accept_source_route = 0, /* we do not accept RH0 by default. */
218 .disable_ipv6 = 0,
219 .accept_dad = 0,
220 .suppress_frag_ndisc = 1,
221 .accept_ra_mtu = 1,
222 .stable_secret = {
223 .initialized = false,
224 },
225 .use_oif_addrs_only = 0,
226 .ignore_routes_with_linkdown = 0,
227 .keep_addr_on_down = 0,
228 .seg6_enabled = 0,
229#ifdef CONFIG_IPV6_SEG6_HMAC
230 .seg6_require_hmac = 0,
231#endif
232 .enhanced_dad = 1,
233 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
234 .disable_policy = 0,
235 .rpl_seg_enabled = 0,
236 .ioam6_enabled = 0,
237 .ioam6_id = IOAM6_DEFAULT_IF_ID,
238 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
239 .ndisc_evict_nocarrier = 1,
240 .ra_honor_pio_life = 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};
305
306/* Check if link is ready: is it up and is a valid qdisc available */
307static inline bool addrconf_link_ready(const struct net_device *dev)
308{
309 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
310}
311
312static void addrconf_del_rs_timer(struct inet6_dev *idev)
313{
314 if (del_timer(&idev->rs_timer))
315 __in6_dev_put(idev);
316}
317
318static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
319{
320 if (cancel_delayed_work(&ifp->dad_work))
321 __in6_ifa_put(ifp);
322}
323
324static void addrconf_mod_rs_timer(struct inet6_dev *idev,
325 unsigned long when)
326{
327 if (!mod_timer(&idev->rs_timer, jiffies + when))
328 in6_dev_hold(idev);
329}
330
331static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
332 unsigned long delay)
333{
334 in6_ifa_hold(ifp);
335 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
336 in6_ifa_put(ifp);
337}
338
339static int snmp6_alloc_dev(struct inet6_dev *idev)
340{
341 int i;
342
343 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT);
344 if (!idev->stats.ipv6)
345 goto err_ip;
346
347 for_each_possible_cpu(i) {
348 struct ipstats_mib *addrconf_stats;
349 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
350 u64_stats_init(&addrconf_stats->syncp);
351 }
352
353
354 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
355 GFP_KERNEL);
356 if (!idev->stats.icmpv6dev)
357 goto err_icmp;
358 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
359 GFP_KERNEL_ACCOUNT);
360 if (!idev->stats.icmpv6msgdev)
361 goto err_icmpmsg;
362
363 return 0;
364
365err_icmpmsg:
366 kfree(idev->stats.icmpv6dev);
367err_icmp:
368 free_percpu(idev->stats.ipv6);
369err_ip:
370 return -ENOMEM;
371}
372
373static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
374{
375 struct inet6_dev *ndev;
376 int err = -ENOMEM;
377
378 ASSERT_RTNL();
379
380 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev)
381 return ERR_PTR(-EINVAL);
382
383 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT);
384 if (!ndev)
385 return ERR_PTR(err);
386
387 rwlock_init(&ndev->lock);
388 ndev->dev = dev;
389 INIT_LIST_HEAD(&ndev->addr_list);
390 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
391 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
392
393 if (ndev->cnf.stable_secret.initialized)
394 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
395
396 ndev->cnf.mtu6 = dev->mtu;
397 ndev->ra_mtu = 0;
398 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
399 if (!ndev->nd_parms) {
400 kfree(ndev);
401 return ERR_PTR(err);
402 }
403 if (ndev->cnf.forwarding)
404 dev_disable_lro(dev);
405 /* We refer to the device */
406 netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL);
407
408 if (snmp6_alloc_dev(ndev) < 0) {
409 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
410 __func__);
411 neigh_parms_release(&nd_tbl, ndev->nd_parms);
412 netdev_put(dev, &ndev->dev_tracker);
413 kfree(ndev);
414 return ERR_PTR(err);
415 }
416
417 if (dev != blackhole_netdev) {
418 if (snmp6_register_dev(ndev) < 0) {
419 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
420 __func__, dev->name);
421 goto err_release;
422 }
423 }
424 /* One reference from device. */
425 refcount_set(&ndev->refcnt, 1);
426
427 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
428 ndev->cnf.accept_dad = -1;
429
430#if IS_ENABLED(CONFIG_IPV6_SIT)
431 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
432 pr_info("%s: Disabled Multicast RS\n", dev->name);
433 ndev->cnf.rtr_solicits = 0;
434 }
435#endif
436
437 INIT_LIST_HEAD(&ndev->tempaddr_list);
438 ndev->desync_factor = U32_MAX;
439 if ((dev->flags&IFF_LOOPBACK) ||
440 dev->type == ARPHRD_TUNNEL ||
441 dev->type == ARPHRD_TUNNEL6 ||
442 dev->type == ARPHRD_SIT ||
443 dev->type == ARPHRD_NONE) {
444 ndev->cnf.use_tempaddr = -1;
445 }
446
447 ndev->token = in6addr_any;
448
449 if (netif_running(dev) && addrconf_link_ready(dev))
450 ndev->if_flags |= IF_READY;
451
452 ipv6_mc_init_dev(ndev);
453 ndev->tstamp = jiffies;
454 if (dev != blackhole_netdev) {
455 err = addrconf_sysctl_register(ndev);
456 if (err) {
457 ipv6_mc_destroy_dev(ndev);
458 snmp6_unregister_dev(ndev);
459 goto err_release;
460 }
461 }
462 /* protected by rtnl_lock */
463 rcu_assign_pointer(dev->ip6_ptr, ndev);
464
465 if (dev != blackhole_netdev) {
466 /* Join interface-local all-node multicast group */
467 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
468
469 /* Join all-node multicast group */
470 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
471
472 /* Join all-router multicast group if forwarding is set */
473 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
474 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
475 }
476 return ndev;
477
478err_release:
479 neigh_parms_release(&nd_tbl, ndev->nd_parms);
480 ndev->dead = 1;
481 in6_dev_finish_destroy(ndev);
482 return ERR_PTR(err);
483}
484
485static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
486{
487 struct inet6_dev *idev;
488
489 ASSERT_RTNL();
490
491 idev = __in6_dev_get(dev);
492 if (!idev) {
493 idev = ipv6_add_dev(dev);
494 if (IS_ERR(idev))
495 return idev;
496 }
497
498 if (dev->flags&IFF_UP)
499 ipv6_mc_up(idev);
500 return idev;
501}
502
503static int inet6_netconf_msgsize_devconf(int type)
504{
505 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
506 + nla_total_size(4); /* NETCONFA_IFINDEX */
507 bool all = false;
508
509 if (type == NETCONFA_ALL)
510 all = true;
511
512 if (all || type == NETCONFA_FORWARDING)
513 size += nla_total_size(4);
514#ifdef CONFIG_IPV6_MROUTE
515 if (all || type == NETCONFA_MC_FORWARDING)
516 size += nla_total_size(4);
517#endif
518 if (all || type == NETCONFA_PROXY_NEIGH)
519 size += nla_total_size(4);
520
521 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
522 size += nla_total_size(4);
523
524 return size;
525}
526
527static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
528 struct ipv6_devconf *devconf, u32 portid,
529 u32 seq, int event, unsigned int flags,
530 int type)
531{
532 struct nlmsghdr *nlh;
533 struct netconfmsg *ncm;
534 bool all = false;
535
536 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
537 flags);
538 if (!nlh)
539 return -EMSGSIZE;
540
541 if (type == NETCONFA_ALL)
542 all = true;
543
544 ncm = nlmsg_data(nlh);
545 ncm->ncm_family = AF_INET6;
546
547 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
548 goto nla_put_failure;
549
550 if (!devconf)
551 goto out;
552
553 if ((all || type == NETCONFA_FORWARDING) &&
554 nla_put_s32(skb, NETCONFA_FORWARDING,
555 READ_ONCE(devconf->forwarding)) < 0)
556 goto nla_put_failure;
557#ifdef CONFIG_IPV6_MROUTE
558 if ((all || type == NETCONFA_MC_FORWARDING) &&
559 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
560 atomic_read(&devconf->mc_forwarding)) < 0)
561 goto nla_put_failure;
562#endif
563 if ((all || type == NETCONFA_PROXY_NEIGH) &&
564 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
565 READ_ONCE(devconf->proxy_ndp)) < 0)
566 goto nla_put_failure;
567
568 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
569 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
570 READ_ONCE(devconf->ignore_routes_with_linkdown)) < 0)
571 goto nla_put_failure;
572
573out:
574 nlmsg_end(skb, nlh);
575 return 0;
576
577nla_put_failure:
578 nlmsg_cancel(skb, nlh);
579 return -EMSGSIZE;
580}
581
582void inet6_netconf_notify_devconf(struct net *net, int event, int type,
583 int ifindex, struct ipv6_devconf *devconf)
584{
585 struct sk_buff *skb;
586 int err = -ENOBUFS;
587
588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
589 if (!skb)
590 goto errout;
591
592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
593 event, 0, type);
594 if (err < 0) {
595 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
596 WARN_ON(err == -EMSGSIZE);
597 kfree_skb(skb);
598 goto errout;
599 }
600 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
601 return;
602errout:
603 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
604}
605
606static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
607 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
608 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
609 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
610 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
611};
612
613static int inet6_netconf_valid_get_req(struct sk_buff *skb,
614 const struct nlmsghdr *nlh,
615 struct nlattr **tb,
616 struct netlink_ext_ack *extack)
617{
618 int i, err;
619
620 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
621 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
622 return -EINVAL;
623 }
624
625 if (!netlink_strict_get_check(skb))
626 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
627 tb, NETCONFA_MAX,
628 devconf_ipv6_policy, extack);
629
630 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
631 tb, NETCONFA_MAX,
632 devconf_ipv6_policy, extack);
633 if (err)
634 return err;
635
636 for (i = 0; i <= NETCONFA_MAX; i++) {
637 if (!tb[i])
638 continue;
639
640 switch (i) {
641 case NETCONFA_IFINDEX:
642 break;
643 default:
644 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
645 return -EINVAL;
646 }
647 }
648
649 return 0;
650}
651
652static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
653 struct nlmsghdr *nlh,
654 struct netlink_ext_ack *extack)
655{
656 struct net *net = sock_net(in_skb->sk);
657 struct nlattr *tb[NETCONFA_MAX+1];
658 struct inet6_dev *in6_dev = NULL;
659 struct net_device *dev = NULL;
660 struct sk_buff *skb;
661 struct ipv6_devconf *devconf;
662 int ifindex;
663 int err;
664
665 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
666 if (err < 0)
667 return err;
668
669 if (!tb[NETCONFA_IFINDEX])
670 return -EINVAL;
671
672 err = -EINVAL;
673 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
674 switch (ifindex) {
675 case NETCONFA_IFINDEX_ALL:
676 devconf = net->ipv6.devconf_all;
677 break;
678 case NETCONFA_IFINDEX_DEFAULT:
679 devconf = net->ipv6.devconf_dflt;
680 break;
681 default:
682 dev = dev_get_by_index(net, ifindex);
683 if (!dev)
684 return -EINVAL;
685 in6_dev = in6_dev_get(dev);
686 if (!in6_dev)
687 goto errout;
688 devconf = &in6_dev->cnf;
689 break;
690 }
691
692 err = -ENOBUFS;
693 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
694 if (!skb)
695 goto errout;
696
697 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
698 NETLINK_CB(in_skb).portid,
699 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
700 NETCONFA_ALL);
701 if (err < 0) {
702 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
703 WARN_ON(err == -EMSGSIZE);
704 kfree_skb(skb);
705 goto errout;
706 }
707 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
708errout:
709 if (in6_dev)
710 in6_dev_put(in6_dev);
711 dev_put(dev);
712 return err;
713}
714
715/* Combine dev_addr_genid and dev_base_seq to detect changes.
716 */
717static u32 inet6_base_seq(const struct net *net)
718{
719 u32 res = atomic_read(&net->ipv6.dev_addr_genid) +
720 READ_ONCE(net->dev_base_seq);
721
722 /* Must not return 0 (see nl_dump_check_consistent()).
723 * Chose a value far away from 0.
724 */
725 if (!res)
726 res = 0x80000000;
727 return res;
728}
729
730static int inet6_netconf_dump_devconf(struct sk_buff *skb,
731 struct netlink_callback *cb)
732{
733 const struct nlmsghdr *nlh = cb->nlh;
734 struct net *net = sock_net(skb->sk);
735 struct {
736 unsigned long ifindex;
737 unsigned int all_default;
738 } *ctx = (void *)cb->ctx;
739 struct net_device *dev;
740 struct inet6_dev *idev;
741 int err = 0;
742
743 if (cb->strict_check) {
744 struct netlink_ext_ack *extack = cb->extack;
745 struct netconfmsg *ncm;
746
747 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
748 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
749 return -EINVAL;
750 }
751
752 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
753 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
754 return -EINVAL;
755 }
756 }
757
758 rcu_read_lock();
759 for_each_netdev_dump(net, dev, ctx->ifindex) {
760 idev = __in6_dev_get(dev);
761 if (!idev)
762 continue;
763 err = inet6_netconf_fill_devconf(skb, dev->ifindex,
764 &idev->cnf,
765 NETLINK_CB(cb->skb).portid,
766 nlh->nlmsg_seq,
767 RTM_NEWNETCONF,
768 NLM_F_MULTI,
769 NETCONFA_ALL);
770 if (err < 0)
771 goto done;
772 }
773 if (ctx->all_default == 0) {
774 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
775 net->ipv6.devconf_all,
776 NETLINK_CB(cb->skb).portid,
777 nlh->nlmsg_seq,
778 RTM_NEWNETCONF, NLM_F_MULTI,
779 NETCONFA_ALL);
780 if (err < 0)
781 goto done;
782 ctx->all_default++;
783 }
784 if (ctx->all_default == 1) {
785 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
786 net->ipv6.devconf_dflt,
787 NETLINK_CB(cb->skb).portid,
788 nlh->nlmsg_seq,
789 RTM_NEWNETCONF, NLM_F_MULTI,
790 NETCONFA_ALL);
791 if (err < 0)
792 goto done;
793 ctx->all_default++;
794 }
795done:
796 rcu_read_unlock();
797 return err;
798}
799
800#ifdef CONFIG_SYSCTL
801static void dev_forward_change(struct inet6_dev *idev)
802{
803 struct net_device *dev;
804 struct inet6_ifaddr *ifa;
805 LIST_HEAD(tmp_addr_list);
806
807 if (!idev)
808 return;
809 dev = idev->dev;
810 if (idev->cnf.forwarding)
811 dev_disable_lro(dev);
812 if (dev->flags & IFF_MULTICAST) {
813 if (idev->cnf.forwarding) {
814 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
815 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
816 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
817 } else {
818 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
819 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
820 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
821 }
822 }
823
824 read_lock_bh(&idev->lock);
825 list_for_each_entry(ifa, &idev->addr_list, if_list) {
826 if (ifa->flags&IFA_F_TENTATIVE)
827 continue;
828 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
829 }
830 read_unlock_bh(&idev->lock);
831
832 while (!list_empty(&tmp_addr_list)) {
833 ifa = list_first_entry(&tmp_addr_list,
834 struct inet6_ifaddr, if_list_aux);
835 list_del(&ifa->if_list_aux);
836 if (idev->cnf.forwarding)
837 addrconf_join_anycast(ifa);
838 else
839 addrconf_leave_anycast(ifa);
840 }
841
842 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
843 NETCONFA_FORWARDING,
844 dev->ifindex, &idev->cnf);
845}
846
847
848static void addrconf_forward_change(struct net *net, __s32 newf)
849{
850 struct net_device *dev;
851 struct inet6_dev *idev;
852
853 for_each_netdev(net, dev) {
854 idev = __in6_dev_get(dev);
855 if (idev) {
856 int changed = (!idev->cnf.forwarding) ^ (!newf);
857
858 WRITE_ONCE(idev->cnf.forwarding, newf);
859 if (changed)
860 dev_forward_change(idev);
861 }
862 }
863}
864
865static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
866{
867 struct net *net;
868 int old;
869
870 if (!rtnl_trylock())
871 return restart_syscall();
872
873 net = (struct net *)table->extra2;
874 old = *p;
875 WRITE_ONCE(*p, newf);
876
877 if (p == &net->ipv6.devconf_dflt->forwarding) {
878 if ((!newf) ^ (!old))
879 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
880 NETCONFA_FORWARDING,
881 NETCONFA_IFINDEX_DEFAULT,
882 net->ipv6.devconf_dflt);
883 rtnl_unlock();
884 return 0;
885 }
886
887 if (p == &net->ipv6.devconf_all->forwarding) {
888 int old_dflt = net->ipv6.devconf_dflt->forwarding;
889
890 WRITE_ONCE(net->ipv6.devconf_dflt->forwarding, newf);
891 if ((!newf) ^ (!old_dflt))
892 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
893 NETCONFA_FORWARDING,
894 NETCONFA_IFINDEX_DEFAULT,
895 net->ipv6.devconf_dflt);
896
897 addrconf_forward_change(net, newf);
898 if ((!newf) ^ (!old))
899 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
900 NETCONFA_FORWARDING,
901 NETCONFA_IFINDEX_ALL,
902 net->ipv6.devconf_all);
903 } else if ((!newf) ^ (!old))
904 dev_forward_change((struct inet6_dev *)table->extra1);
905 rtnl_unlock();
906
907 if (newf)
908 rt6_purge_dflt_routers(net);
909 return 1;
910}
911
912static void addrconf_linkdown_change(struct net *net, __s32 newf)
913{
914 struct net_device *dev;
915 struct inet6_dev *idev;
916
917 for_each_netdev(net, dev) {
918 idev = __in6_dev_get(dev);
919 if (idev) {
920 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
921
922 WRITE_ONCE(idev->cnf.ignore_routes_with_linkdown, newf);
923 if (changed)
924 inet6_netconf_notify_devconf(dev_net(dev),
925 RTM_NEWNETCONF,
926 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
927 dev->ifindex,
928 &idev->cnf);
929 }
930 }
931}
932
933static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
934{
935 struct net *net;
936 int old;
937
938 if (!rtnl_trylock())
939 return restart_syscall();
940
941 net = (struct net *)table->extra2;
942 old = *p;
943 WRITE_ONCE(*p, newf);
944
945 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
946 if ((!newf) ^ (!old))
947 inet6_netconf_notify_devconf(net,
948 RTM_NEWNETCONF,
949 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
950 NETCONFA_IFINDEX_DEFAULT,
951 net->ipv6.devconf_dflt);
952 rtnl_unlock();
953 return 0;
954 }
955
956 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
957 WRITE_ONCE(net->ipv6.devconf_dflt->ignore_routes_with_linkdown, newf);
958 addrconf_linkdown_change(net, newf);
959 if ((!newf) ^ (!old))
960 inet6_netconf_notify_devconf(net,
961 RTM_NEWNETCONF,
962 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
963 NETCONFA_IFINDEX_ALL,
964 net->ipv6.devconf_all);
965 }
966 rtnl_unlock();
967
968 return 1;
969}
970
971#endif
972
973/* Nobody refers to this ifaddr, destroy it */
974void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
975{
976 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
977
978#ifdef NET_REFCNT_DEBUG
979 pr_debug("%s\n", __func__);
980#endif
981
982 in6_dev_put(ifp->idev);
983
984 if (cancel_delayed_work(&ifp->dad_work))
985 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
986 ifp);
987
988 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
989 pr_warn("Freeing alive inet6 address %p\n", ifp);
990 return;
991 }
992
993 kfree_rcu(ifp, rcu);
994}
995
996static void
997ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
998{
999 struct list_head *p;
1000 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
1001
1002 /*
1003 * Each device address list is sorted in order of scope -
1004 * global before linklocal.
1005 */
1006 list_for_each(p, &idev->addr_list) {
1007 struct inet6_ifaddr *ifa
1008 = list_entry(p, struct inet6_ifaddr, if_list);
1009 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
1010 break;
1011 }
1012
1013 list_add_tail_rcu(&ifp->if_list, p);
1014}
1015
1016static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
1017{
1018 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
1019
1020 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1021}
1022
1023static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1024 struct net_device *dev, unsigned int hash)
1025{
1026 struct inet6_ifaddr *ifp;
1027
1028 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1029 if (ipv6_addr_equal(&ifp->addr, addr)) {
1030 if (!dev || ifp->idev->dev == dev)
1031 return true;
1032 }
1033 }
1034 return false;
1035}
1036
1037static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1038{
1039 struct net *net = dev_net(dev);
1040 unsigned int hash = inet6_addr_hash(net, &ifa->addr);
1041 int err = 0;
1042
1043 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1044
1045 /* Ignore adding duplicate addresses on an interface */
1046 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) {
1047 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1048 err = -EEXIST;
1049 } else {
1050 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]);
1051 }
1052
1053 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1054
1055 return err;
1056}
1057
1058/* On success it returns ifp with increased reference count */
1059
1060static struct inet6_ifaddr *
1061ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1062 bool can_block, struct netlink_ext_ack *extack)
1063{
1064 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1065 int addr_type = ipv6_addr_type(cfg->pfx);
1066 struct net *net = dev_net(idev->dev);
1067 struct inet6_ifaddr *ifa = NULL;
1068 struct fib6_info *f6i = NULL;
1069 int err = 0;
1070
1071 if (addr_type == IPV6_ADDR_ANY) {
1072 NL_SET_ERR_MSG_MOD(extack, "Invalid address");
1073 return ERR_PTR(-EADDRNOTAVAIL);
1074 } else if (addr_type & IPV6_ADDR_MULTICAST &&
1075 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) {
1076 NL_SET_ERR_MSG_MOD(extack, "Cannot assign multicast address without \"IFA_F_MCAUTOJOIN\" flag");
1077 return ERR_PTR(-EADDRNOTAVAIL);
1078 } else if (!(idev->dev->flags & IFF_LOOPBACK) &&
1079 !netif_is_l3_master(idev->dev) &&
1080 addr_type & IPV6_ADDR_LOOPBACK) {
1081 NL_SET_ERR_MSG_MOD(extack, "Cannot assign loopback address on this device");
1082 return ERR_PTR(-EADDRNOTAVAIL);
1083 }
1084
1085 if (idev->dead) {
1086 NL_SET_ERR_MSG_MOD(extack, "device is going away");
1087 err = -ENODEV;
1088 goto out;
1089 }
1090
1091 if (idev->cnf.disable_ipv6) {
1092 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
1093 err = -EACCES;
1094 goto out;
1095 }
1096
1097 /* validator notifier needs to be blocking;
1098 * do not call in atomic context
1099 */
1100 if (can_block) {
1101 struct in6_validator_info i6vi = {
1102 .i6vi_addr = *cfg->pfx,
1103 .i6vi_dev = idev,
1104 .extack = extack,
1105 };
1106
1107 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1108 err = notifier_to_errno(err);
1109 if (err < 0)
1110 goto out;
1111 }
1112
1113 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT);
1114 if (!ifa) {
1115 err = -ENOBUFS;
1116 goto out;
1117 }
1118
1119 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags, extack);
1120 if (IS_ERR(f6i)) {
1121 err = PTR_ERR(f6i);
1122 f6i = NULL;
1123 goto out;
1124 }
1125
1126 neigh_parms_data_state_setall(idev->nd_parms);
1127
1128 ifa->addr = *cfg->pfx;
1129 if (cfg->peer_pfx)
1130 ifa->peer_addr = *cfg->peer_pfx;
1131
1132 spin_lock_init(&ifa->lock);
1133 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1134 INIT_HLIST_NODE(&ifa->addr_lst);
1135 ifa->scope = cfg->scope;
1136 ifa->prefix_len = cfg->plen;
1137 ifa->rt_priority = cfg->rt_priority;
1138 ifa->flags = cfg->ifa_flags;
1139 ifa->ifa_proto = cfg->ifa_proto;
1140 /* No need to add the TENTATIVE flag for addresses with NODAD */
1141 if (!(cfg->ifa_flags & IFA_F_NODAD))
1142 ifa->flags |= IFA_F_TENTATIVE;
1143 ifa->valid_lft = cfg->valid_lft;
1144 ifa->prefered_lft = cfg->preferred_lft;
1145 ifa->cstamp = ifa->tstamp = jiffies;
1146 ifa->tokenized = false;
1147
1148 ifa->rt = f6i;
1149
1150 ifa->idev = idev;
1151 in6_dev_hold(idev);
1152
1153 /* For caller */
1154 refcount_set(&ifa->refcnt, 1);
1155
1156 rcu_read_lock();
1157
1158 err = ipv6_add_addr_hash(idev->dev, ifa);
1159 if (err < 0) {
1160 rcu_read_unlock();
1161 goto out;
1162 }
1163
1164 write_lock_bh(&idev->lock);
1165
1166 /* Add to inet6_dev unicast addr list. */
1167 ipv6_link_dev_addr(idev, ifa);
1168
1169 if (ifa->flags&IFA_F_TEMPORARY) {
1170 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1171 in6_ifa_hold(ifa);
1172 }
1173
1174 in6_ifa_hold(ifa);
1175 write_unlock_bh(&idev->lock);
1176
1177 rcu_read_unlock();
1178
1179 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1180out:
1181 if (unlikely(err < 0)) {
1182 fib6_info_release(f6i);
1183
1184 if (ifa) {
1185 if (ifa->idev)
1186 in6_dev_put(ifa->idev);
1187 kfree(ifa);
1188 }
1189 ifa = ERR_PTR(err);
1190 }
1191
1192 return ifa;
1193}
1194
1195enum cleanup_prefix_rt_t {
1196 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1197 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1198 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1199};
1200
1201/*
1202 * Check, whether the prefix for ifp would still need a prefix route
1203 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1204 * constants.
1205 *
1206 * 1) we don't purge prefix if address was not permanent.
1207 * prefix is managed by its own lifetime.
1208 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1209 * 3) if there are no addresses, delete prefix.
1210 * 4) if there are still other permanent address(es),
1211 * corresponding prefix is still permanent.
1212 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1213 * don't purge the prefix, assume user space is managing it.
1214 * 6) otherwise, update prefix lifetime to the
1215 * longest valid lifetime among the corresponding
1216 * addresses on the device.
1217 * Note: subsequent RA will update lifetime.
1218 **/
1219static enum cleanup_prefix_rt_t
1220check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1221{
1222 struct inet6_ifaddr *ifa;
1223 struct inet6_dev *idev = ifp->idev;
1224 unsigned long lifetime;
1225 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1226
1227 *expires = jiffies;
1228
1229 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1230 if (ifa == ifp)
1231 continue;
1232 if (ifa->prefix_len != ifp->prefix_len ||
1233 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1234 ifp->prefix_len))
1235 continue;
1236 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1237 return CLEANUP_PREFIX_RT_NOP;
1238
1239 action = CLEANUP_PREFIX_RT_EXPIRE;
1240
1241 spin_lock(&ifa->lock);
1242
1243 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1244 /*
1245 * Note: Because this address is
1246 * not permanent, lifetime <
1247 * LONG_MAX / HZ here.
1248 */
1249 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1250 *expires = ifa->tstamp + lifetime * HZ;
1251 spin_unlock(&ifa->lock);
1252 }
1253
1254 return action;
1255}
1256
1257static void
1258cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1259 bool del_rt, bool del_peer)
1260{
1261 struct fib6_table *table;
1262 struct fib6_info *f6i;
1263
1264 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1265 ifp->prefix_len,
1266 ifp->idev->dev, 0, RTF_DEFAULT, true);
1267 if (f6i) {
1268 if (del_rt)
1269 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1270 else {
1271 if (!(f6i->fib6_flags & RTF_EXPIRES)) {
1272 table = f6i->fib6_table;
1273 spin_lock_bh(&table->tb6_lock);
1274
1275 fib6_set_expires(f6i, expires);
1276 fib6_add_gc_list(f6i);
1277
1278 spin_unlock_bh(&table->tb6_lock);
1279 }
1280 fib6_info_release(f6i);
1281 }
1282 }
1283}
1284
1285
1286/* This function wants to get referenced ifp and releases it before return */
1287
1288static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1289{
1290 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1291 struct net *net = dev_net(ifp->idev->dev);
1292 unsigned long expires;
1293 int state;
1294
1295 ASSERT_RTNL();
1296
1297 spin_lock_bh(&ifp->lock);
1298 state = ifp->state;
1299 ifp->state = INET6_IFADDR_STATE_DEAD;
1300 spin_unlock_bh(&ifp->lock);
1301
1302 if (state == INET6_IFADDR_STATE_DEAD)
1303 goto out;
1304
1305 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1306 hlist_del_init_rcu(&ifp->addr_lst);
1307 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1308
1309 write_lock_bh(&ifp->idev->lock);
1310
1311 if (ifp->flags&IFA_F_TEMPORARY) {
1312 list_del(&ifp->tmp_list);
1313 if (ifp->ifpub) {
1314 in6_ifa_put(ifp->ifpub);
1315 ifp->ifpub = NULL;
1316 }
1317 __in6_ifa_put(ifp);
1318 }
1319
1320 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1321 action = check_cleanup_prefix_route(ifp, &expires);
1322
1323 list_del_rcu(&ifp->if_list);
1324 __in6_ifa_put(ifp);
1325
1326 write_unlock_bh(&ifp->idev->lock);
1327
1328 addrconf_del_dad_work(ifp);
1329
1330 ipv6_ifa_notify(RTM_DELADDR, ifp);
1331
1332 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1333
1334 if (action != CLEANUP_PREFIX_RT_NOP) {
1335 cleanup_prefix_route(ifp, expires,
1336 action == CLEANUP_PREFIX_RT_DEL, false);
1337 }
1338
1339 /* clean up prefsrc entries */
1340 rt6_remove_prefsrc(ifp);
1341out:
1342 in6_ifa_put(ifp);
1343}
1344
1345static unsigned long ipv6_get_regen_advance(const struct inet6_dev *idev)
1346{
1347 return READ_ONCE(idev->cnf.regen_min_advance) +
1348 READ_ONCE(idev->cnf.regen_max_retry) *
1349 READ_ONCE(idev->cnf.dad_transmits) *
1350 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1351}
1352
1353static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1354{
1355 struct inet6_dev *idev = ifp->idev;
1356 unsigned long tmp_tstamp, age;
1357 unsigned long regen_advance;
1358 unsigned long now = jiffies;
1359 u32 if_public_preferred_lft;
1360 s32 cnf_temp_preferred_lft;
1361 struct inet6_ifaddr *ift;
1362 struct ifa6_config cfg;
1363 long max_desync_factor;
1364 struct in6_addr addr;
1365 int ret = 0;
1366
1367 write_lock_bh(&idev->lock);
1368
1369retry:
1370 in6_dev_hold(idev);
1371 if (READ_ONCE(idev->cnf.use_tempaddr) <= 0) {
1372 write_unlock_bh(&idev->lock);
1373 pr_info("%s: use_tempaddr is disabled\n", __func__);
1374 in6_dev_put(idev);
1375 ret = -1;
1376 goto out;
1377 }
1378 spin_lock_bh(&ifp->lock);
1379 if (ifp->regen_count++ >= READ_ONCE(idev->cnf.regen_max_retry)) {
1380 WRITE_ONCE(idev->cnf.use_tempaddr, -1); /*XXX*/
1381 spin_unlock_bh(&ifp->lock);
1382 write_unlock_bh(&idev->lock);
1383 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1384 __func__);
1385 in6_dev_put(idev);
1386 ret = -1;
1387 goto out;
1388 }
1389 in6_ifa_hold(ifp);
1390 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1391 ipv6_gen_rnd_iid(&addr);
1392
1393 age = (now - ifp->tstamp) / HZ;
1394
1395 regen_advance = ipv6_get_regen_advance(idev);
1396
1397 /* recalculate max_desync_factor each time and update
1398 * idev->desync_factor if it's larger
1399 */
1400 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1401 max_desync_factor = min_t(long,
1402 READ_ONCE(idev->cnf.max_desync_factor),
1403 cnf_temp_preferred_lft - regen_advance);
1404
1405 if (unlikely(idev->desync_factor > max_desync_factor)) {
1406 if (max_desync_factor > 0) {
1407 get_random_bytes(&idev->desync_factor,
1408 sizeof(idev->desync_factor));
1409 idev->desync_factor %= max_desync_factor;
1410 } else {
1411 idev->desync_factor = 0;
1412 }
1413 }
1414
1415 if_public_preferred_lft = ifp->prefered_lft;
1416
1417 memset(&cfg, 0, sizeof(cfg));
1418 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1419 READ_ONCE(idev->cnf.temp_valid_lft) + age);
1420 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1421 cfg.preferred_lft = min_t(__u32, if_public_preferred_lft, cfg.preferred_lft);
1422 cfg.preferred_lft = min_t(__u32, cfg.valid_lft, cfg.preferred_lft);
1423
1424 cfg.plen = ifp->prefix_len;
1425 tmp_tstamp = ifp->tstamp;
1426 spin_unlock_bh(&ifp->lock);
1427
1428 write_unlock_bh(&idev->lock);
1429
1430 /* From RFC 4941:
1431 *
1432 * A temporary address is created only if this calculated Preferred
1433 * Lifetime is greater than REGEN_ADVANCE time units. In
1434 * particular, an implementation must not create a temporary address
1435 * with a zero Preferred Lifetime.
1436 *
1437 * ...
1438 *
1439 * When creating a temporary address, the lifetime values MUST be
1440 * derived from the corresponding prefix as follows:
1441 *
1442 * ...
1443 *
1444 * * Its Preferred Lifetime is the lower of the Preferred Lifetime
1445 * of the public address or TEMP_PREFERRED_LIFETIME -
1446 * DESYNC_FACTOR.
1447 *
1448 * To comply with the RFC's requirements, clamp the preferred lifetime
1449 * to a minimum of regen_advance, unless that would exceed valid_lft or
1450 * ifp->prefered_lft.
1451 *
1452 * Use age calculation as in addrconf_verify to avoid unnecessary
1453 * temporary addresses being generated.
1454 */
1455 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1456 if (cfg.preferred_lft <= regen_advance + age) {
1457 cfg.preferred_lft = regen_advance + age + 1;
1458 if (cfg.preferred_lft > cfg.valid_lft ||
1459 cfg.preferred_lft > if_public_preferred_lft) {
1460 in6_ifa_put(ifp);
1461 in6_dev_put(idev);
1462 ret = -1;
1463 goto out;
1464 }
1465 }
1466
1467 cfg.ifa_flags = IFA_F_TEMPORARY;
1468 /* set in addrconf_prefix_rcv() */
1469 if (ifp->flags & IFA_F_OPTIMISTIC)
1470 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1471
1472 cfg.pfx = &addr;
1473 cfg.scope = ipv6_addr_scope(cfg.pfx);
1474
1475 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1476 if (IS_ERR(ift)) {
1477 in6_ifa_put(ifp);
1478 in6_dev_put(idev);
1479 pr_info("%s: retry temporary address regeneration\n", __func__);
1480 write_lock_bh(&idev->lock);
1481 goto retry;
1482 }
1483
1484 spin_lock_bh(&ift->lock);
1485 ift->ifpub = ifp;
1486 ift->cstamp = now;
1487 ift->tstamp = tmp_tstamp;
1488 spin_unlock_bh(&ift->lock);
1489
1490 addrconf_dad_start(ift);
1491 in6_ifa_put(ift);
1492 in6_dev_put(idev);
1493out:
1494 return ret;
1495}
1496
1497/*
1498 * Choose an appropriate source address (RFC3484)
1499 */
1500enum {
1501 IPV6_SADDR_RULE_INIT = 0,
1502 IPV6_SADDR_RULE_LOCAL,
1503 IPV6_SADDR_RULE_SCOPE,
1504 IPV6_SADDR_RULE_PREFERRED,
1505#ifdef CONFIG_IPV6_MIP6
1506 IPV6_SADDR_RULE_HOA,
1507#endif
1508 IPV6_SADDR_RULE_OIF,
1509 IPV6_SADDR_RULE_LABEL,
1510 IPV6_SADDR_RULE_PRIVACY,
1511 IPV6_SADDR_RULE_ORCHID,
1512 IPV6_SADDR_RULE_PREFIX,
1513#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1514 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1515#endif
1516 IPV6_SADDR_RULE_MAX
1517};
1518
1519struct ipv6_saddr_score {
1520 int rule;
1521 int addr_type;
1522 struct inet6_ifaddr *ifa;
1523 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1524 int scopedist;
1525 int matchlen;
1526};
1527
1528struct ipv6_saddr_dst {
1529 const struct in6_addr *addr;
1530 int ifindex;
1531 int scope;
1532 int label;
1533 unsigned int prefs;
1534};
1535
1536static inline int ipv6_saddr_preferred(int type)
1537{
1538 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1539 return 1;
1540 return 0;
1541}
1542
1543static bool ipv6_use_optimistic_addr(const struct net *net,
1544 const struct inet6_dev *idev)
1545{
1546#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1547 if (!idev)
1548 return false;
1549 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) &&
1550 !READ_ONCE(idev->cnf.optimistic_dad))
1551 return false;
1552 if (!READ_ONCE(net->ipv6.devconf_all->use_optimistic) &&
1553 !READ_ONCE(idev->cnf.use_optimistic))
1554 return false;
1555
1556 return true;
1557#else
1558 return false;
1559#endif
1560}
1561
1562static bool ipv6_allow_optimistic_dad(const struct net *net,
1563 const struct inet6_dev *idev)
1564{
1565#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1566 if (!idev)
1567 return false;
1568 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) &&
1569 !READ_ONCE(idev->cnf.optimistic_dad))
1570 return false;
1571
1572 return true;
1573#else
1574 return false;
1575#endif
1576}
1577
1578static int ipv6_get_saddr_eval(struct net *net,
1579 struct ipv6_saddr_score *score,
1580 struct ipv6_saddr_dst *dst,
1581 int i)
1582{
1583 int ret;
1584
1585 if (i <= score->rule) {
1586 switch (i) {
1587 case IPV6_SADDR_RULE_SCOPE:
1588 ret = score->scopedist;
1589 break;
1590 case IPV6_SADDR_RULE_PREFIX:
1591 ret = score->matchlen;
1592 break;
1593 default:
1594 ret = !!test_bit(i, score->scorebits);
1595 }
1596 goto out;
1597 }
1598
1599 switch (i) {
1600 case IPV6_SADDR_RULE_INIT:
1601 /* Rule 0: remember if hiscore is not ready yet */
1602 ret = !!score->ifa;
1603 break;
1604 case IPV6_SADDR_RULE_LOCAL:
1605 /* Rule 1: Prefer same address */
1606 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1607 break;
1608 case IPV6_SADDR_RULE_SCOPE:
1609 /* Rule 2: Prefer appropriate scope
1610 *
1611 * ret
1612 * ^
1613 * -1 | d 15
1614 * ---+--+-+---> scope
1615 * |
1616 * | d is scope of the destination.
1617 * B-d | \
1618 * | \ <- smaller scope is better if
1619 * B-15 | \ if scope is enough for destination.
1620 * | ret = B - scope (-1 <= scope >= d <= 15).
1621 * d-C-1 | /
1622 * |/ <- greater is better
1623 * -C / if scope is not enough for destination.
1624 * /| ret = scope - C (-1 <= d < scope <= 15).
1625 *
1626 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1627 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1628 * Assume B = 0 and we get C > 29.
1629 */
1630 ret = __ipv6_addr_src_scope(score->addr_type);
1631 if (ret >= dst->scope)
1632 ret = -ret;
1633 else
1634 ret -= 128; /* 30 is enough */
1635 score->scopedist = ret;
1636 break;
1637 case IPV6_SADDR_RULE_PREFERRED:
1638 {
1639 /* Rule 3: Avoid deprecated and optimistic addresses */
1640 u8 avoid = IFA_F_DEPRECATED;
1641
1642 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1643 avoid |= IFA_F_OPTIMISTIC;
1644 ret = ipv6_saddr_preferred(score->addr_type) ||
1645 !(score->ifa->flags & avoid);
1646 break;
1647 }
1648#ifdef CONFIG_IPV6_MIP6
1649 case IPV6_SADDR_RULE_HOA:
1650 {
1651 /* Rule 4: Prefer home address */
1652 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1653 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1654 break;
1655 }
1656#endif
1657 case IPV6_SADDR_RULE_OIF:
1658 /* Rule 5: Prefer outgoing interface */
1659 ret = (!dst->ifindex ||
1660 dst->ifindex == score->ifa->idev->dev->ifindex);
1661 break;
1662 case IPV6_SADDR_RULE_LABEL:
1663 /* Rule 6: Prefer matching label */
1664 ret = ipv6_addr_label(net,
1665 &score->ifa->addr, score->addr_type,
1666 score->ifa->idev->dev->ifindex) == dst->label;
1667 break;
1668 case IPV6_SADDR_RULE_PRIVACY:
1669 {
1670 /* Rule 7: Prefer public address
1671 * Note: prefer temporary address if use_tempaddr >= 2
1672 */
1673 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1674 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1675 READ_ONCE(score->ifa->idev->cnf.use_tempaddr) >= 2;
1676 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1677 break;
1678 }
1679 case IPV6_SADDR_RULE_ORCHID:
1680 /* Rule 8-: Prefer ORCHID vs ORCHID or
1681 * non-ORCHID vs non-ORCHID
1682 */
1683 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1684 ipv6_addr_orchid(dst->addr));
1685 break;
1686 case IPV6_SADDR_RULE_PREFIX:
1687 /* Rule 8: Use longest matching prefix */
1688 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1689 if (ret > score->ifa->prefix_len)
1690 ret = score->ifa->prefix_len;
1691 score->matchlen = ret;
1692 break;
1693#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1694 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1695 /* Optimistic addresses still have lower precedence than other
1696 * preferred addresses.
1697 */
1698 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1699 break;
1700#endif
1701 default:
1702 ret = 0;
1703 }
1704
1705 if (ret)
1706 __set_bit(i, score->scorebits);
1707 score->rule = i;
1708out:
1709 return ret;
1710}
1711
1712static int __ipv6_dev_get_saddr(struct net *net,
1713 struct ipv6_saddr_dst *dst,
1714 struct inet6_dev *idev,
1715 struct ipv6_saddr_score *scores,
1716 int hiscore_idx)
1717{
1718 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1719
1720 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1721 int i;
1722
1723 /*
1724 * - Tentative Address (RFC2462 section 5.4)
1725 * - A tentative address is not considered
1726 * "assigned to an interface" in the traditional
1727 * sense, unless it is also flagged as optimistic.
1728 * - Candidate Source Address (section 4)
1729 * - In any case, anycast addresses, multicast
1730 * addresses, and the unspecified address MUST
1731 * NOT be included in a candidate set.
1732 */
1733 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1734 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1735 continue;
1736
1737 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1738
1739 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1740 score->addr_type & IPV6_ADDR_MULTICAST)) {
1741 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1742 idev->dev->name);
1743 continue;
1744 }
1745
1746 score->rule = -1;
1747 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1748
1749 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1750 int minihiscore, miniscore;
1751
1752 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1753 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1754
1755 if (minihiscore > miniscore) {
1756 if (i == IPV6_SADDR_RULE_SCOPE &&
1757 score->scopedist > 0) {
1758 /*
1759 * special case:
1760 * each remaining entry
1761 * has too small (not enough)
1762 * scope, because ifa entries
1763 * are sorted by their scope
1764 * values.
1765 */
1766 goto out;
1767 }
1768 break;
1769 } else if (minihiscore < miniscore) {
1770 swap(hiscore, score);
1771 hiscore_idx = 1 - hiscore_idx;
1772
1773 /* restore our iterator */
1774 score->ifa = hiscore->ifa;
1775
1776 break;
1777 }
1778 }
1779 }
1780out:
1781 return hiscore_idx;
1782}
1783
1784static int ipv6_get_saddr_master(struct net *net,
1785 const struct net_device *dst_dev,
1786 const struct net_device *master,
1787 struct ipv6_saddr_dst *dst,
1788 struct ipv6_saddr_score *scores,
1789 int hiscore_idx)
1790{
1791 struct inet6_dev *idev;
1792
1793 idev = __in6_dev_get(dst_dev);
1794 if (idev)
1795 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1796 scores, hiscore_idx);
1797
1798 idev = __in6_dev_get(master);
1799 if (idev)
1800 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1801 scores, hiscore_idx);
1802
1803 return hiscore_idx;
1804}
1805
1806int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1807 const struct in6_addr *daddr, unsigned int prefs,
1808 struct in6_addr *saddr)
1809{
1810 struct ipv6_saddr_score scores[2], *hiscore;
1811 struct ipv6_saddr_dst dst;
1812 struct inet6_dev *idev;
1813 struct net_device *dev;
1814 int dst_type;
1815 bool use_oif_addr = false;
1816 int hiscore_idx = 0;
1817 int ret = 0;
1818
1819 dst_type = __ipv6_addr_type(daddr);
1820 dst.addr = daddr;
1821 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1822 dst.scope = __ipv6_addr_src_scope(dst_type);
1823 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1824 dst.prefs = prefs;
1825
1826 scores[hiscore_idx].rule = -1;
1827 scores[hiscore_idx].ifa = NULL;
1828
1829 rcu_read_lock();
1830
1831 /* Candidate Source Address (section 4)
1832 * - multicast and link-local destination address,
1833 * the set of candidate source address MUST only
1834 * include addresses assigned to interfaces
1835 * belonging to the same link as the outgoing
1836 * interface.
1837 * (- For site-local destination addresses, the
1838 * set of candidate source addresses MUST only
1839 * include addresses assigned to interfaces
1840 * belonging to the same site as the outgoing
1841 * interface.)
1842 * - "It is RECOMMENDED that the candidate source addresses
1843 * be the set of unicast addresses assigned to the
1844 * interface that will be used to send to the destination
1845 * (the 'outgoing' interface)." (RFC 6724)
1846 */
1847 if (dst_dev) {
1848 idev = __in6_dev_get(dst_dev);
1849 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1850 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1851 (idev && READ_ONCE(idev->cnf.use_oif_addrs_only))) {
1852 use_oif_addr = true;
1853 }
1854 }
1855
1856 if (use_oif_addr) {
1857 if (idev)
1858 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1859 } else {
1860 const struct net_device *master;
1861 int master_idx = 0;
1862
1863 /* if dst_dev exists and is enslaved to an L3 device, then
1864 * prefer addresses from dst_dev and then the master over
1865 * any other enslaved devices in the L3 domain.
1866 */
1867 master = l3mdev_master_dev_rcu(dst_dev);
1868 if (master) {
1869 master_idx = master->ifindex;
1870
1871 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1872 master, &dst,
1873 scores, hiscore_idx);
1874
1875 if (scores[hiscore_idx].ifa)
1876 goto out;
1877 }
1878
1879 for_each_netdev_rcu(net, dev) {
1880 /* only consider addresses on devices in the
1881 * same L3 domain
1882 */
1883 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1884 continue;
1885 idev = __in6_dev_get(dev);
1886 if (!idev)
1887 continue;
1888 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1889 }
1890 }
1891
1892out:
1893 hiscore = &scores[hiscore_idx];
1894 if (!hiscore->ifa)
1895 ret = -EADDRNOTAVAIL;
1896 else
1897 *saddr = hiscore->ifa->addr;
1898
1899 rcu_read_unlock();
1900 return ret;
1901}
1902EXPORT_SYMBOL(ipv6_dev_get_saddr);
1903
1904static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1905 u32 banned_flags)
1906{
1907 struct inet6_ifaddr *ifp;
1908 int err = -EADDRNOTAVAIL;
1909
1910 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1911 if (ifp->scope > IFA_LINK)
1912 break;
1913 if (ifp->scope == IFA_LINK &&
1914 !(ifp->flags & banned_flags)) {
1915 *addr = ifp->addr;
1916 err = 0;
1917 break;
1918 }
1919 }
1920 return err;
1921}
1922
1923int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1924 u32 banned_flags)
1925{
1926 struct inet6_dev *idev;
1927 int err = -EADDRNOTAVAIL;
1928
1929 rcu_read_lock();
1930 idev = __in6_dev_get(dev);
1931 if (idev) {
1932 read_lock_bh(&idev->lock);
1933 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1934 read_unlock_bh(&idev->lock);
1935 }
1936 rcu_read_unlock();
1937 return err;
1938}
1939
1940static int ipv6_count_addresses(const struct inet6_dev *idev)
1941{
1942 const struct inet6_ifaddr *ifp;
1943 int cnt = 0;
1944
1945 rcu_read_lock();
1946 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1947 cnt++;
1948 rcu_read_unlock();
1949 return cnt;
1950}
1951
1952int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1953 const struct net_device *dev, int strict)
1954{
1955 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1956 strict, IFA_F_TENTATIVE);
1957}
1958EXPORT_SYMBOL(ipv6_chk_addr);
1959
1960/* device argument is used to find the L3 domain of interest. If
1961 * skip_dev_check is set, then the ifp device is not checked against
1962 * the passed in dev argument. So the 2 cases for addresses checks are:
1963 * 1. does the address exist in the L3 domain that dev is part of
1964 * (skip_dev_check = true), or
1965 *
1966 * 2. does the address exist on the specific device
1967 * (skip_dev_check = false)
1968 */
1969static struct net_device *
1970__ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1971 const struct net_device *dev, bool skip_dev_check,
1972 int strict, u32 banned_flags)
1973{
1974 unsigned int hash = inet6_addr_hash(net, addr);
1975 struct net_device *l3mdev, *ndev;
1976 struct inet6_ifaddr *ifp;
1977 u32 ifp_flags;
1978
1979 rcu_read_lock();
1980
1981 l3mdev = l3mdev_master_dev_rcu(dev);
1982 if (skip_dev_check)
1983 dev = NULL;
1984
1985 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1986 ndev = ifp->idev->dev;
1987
1988 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1989 continue;
1990
1991 /* Decouple optimistic from tentative for evaluation here.
1992 * Ban optimistic addresses explicitly, when required.
1993 */
1994 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1995 ? (ifp->flags&~IFA_F_TENTATIVE)
1996 : ifp->flags;
1997 if (ipv6_addr_equal(&ifp->addr, addr) &&
1998 !(ifp_flags&banned_flags) &&
1999 (!dev || ndev == dev ||
2000 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
2001 rcu_read_unlock();
2002 return ndev;
2003 }
2004 }
2005
2006 rcu_read_unlock();
2007 return NULL;
2008}
2009
2010int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
2011 const struct net_device *dev, bool skip_dev_check,
2012 int strict, u32 banned_flags)
2013{
2014 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
2015 strict, banned_flags) ? 1 : 0;
2016}
2017EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
2018
2019
2020/* Compares an address/prefix_len with addresses on device @dev.
2021 * If one is found it returns true.
2022 */
2023bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
2024 const unsigned int prefix_len, struct net_device *dev)
2025{
2026 const struct inet6_ifaddr *ifa;
2027 const struct inet6_dev *idev;
2028 bool ret = false;
2029
2030 rcu_read_lock();
2031 idev = __in6_dev_get(dev);
2032 if (idev) {
2033 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2034 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
2035 if (ret)
2036 break;
2037 }
2038 }
2039 rcu_read_unlock();
2040
2041 return ret;
2042}
2043EXPORT_SYMBOL(ipv6_chk_custom_prefix);
2044
2045int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
2046{
2047 const struct inet6_ifaddr *ifa;
2048 const struct inet6_dev *idev;
2049 int onlink;
2050
2051 onlink = 0;
2052 rcu_read_lock();
2053 idev = __in6_dev_get(dev);
2054 if (idev) {
2055 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2056 onlink = ipv6_prefix_equal(addr, &ifa->addr,
2057 ifa->prefix_len);
2058 if (onlink)
2059 break;
2060 }
2061 }
2062 rcu_read_unlock();
2063 return onlink;
2064}
2065EXPORT_SYMBOL(ipv6_chk_prefix);
2066
2067/**
2068 * ipv6_dev_find - find the first device with a given source address.
2069 * @net: the net namespace
2070 * @addr: the source address
2071 * @dev: used to find the L3 domain of interest
2072 *
2073 * The caller should be protected by RCU, or RTNL.
2074 */
2075struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2076 struct net_device *dev)
2077{
2078 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2079 IFA_F_TENTATIVE);
2080}
2081EXPORT_SYMBOL(ipv6_dev_find);
2082
2083struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2084 struct net_device *dev, int strict)
2085{
2086 unsigned int hash = inet6_addr_hash(net, addr);
2087 struct inet6_ifaddr *ifp, *result = NULL;
2088
2089 rcu_read_lock();
2090 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
2091 if (ipv6_addr_equal(&ifp->addr, addr)) {
2092 if (!dev || ifp->idev->dev == dev ||
2093 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2094 if (in6_ifa_hold_safe(ifp)) {
2095 result = ifp;
2096 break;
2097 }
2098 }
2099 }
2100 }
2101 rcu_read_unlock();
2102
2103 return result;
2104}
2105
2106/* Gets referenced address, destroys ifaddr */
2107
2108static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2109{
2110 if (dad_failed)
2111 ifp->flags |= IFA_F_DADFAILED;
2112
2113 if (ifp->flags&IFA_F_TEMPORARY) {
2114 struct inet6_ifaddr *ifpub;
2115 spin_lock_bh(&ifp->lock);
2116 ifpub = ifp->ifpub;
2117 if (ifpub) {
2118 in6_ifa_hold(ifpub);
2119 spin_unlock_bh(&ifp->lock);
2120 ipv6_create_tempaddr(ifpub, true);
2121 in6_ifa_put(ifpub);
2122 } else {
2123 spin_unlock_bh(&ifp->lock);
2124 }
2125 ipv6_del_addr(ifp);
2126 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2127 spin_lock_bh(&ifp->lock);
2128 addrconf_del_dad_work(ifp);
2129 ifp->flags |= IFA_F_TENTATIVE;
2130 if (dad_failed)
2131 ifp->flags &= ~IFA_F_OPTIMISTIC;
2132 spin_unlock_bh(&ifp->lock);
2133 if (dad_failed)
2134 ipv6_ifa_notify(0, ifp);
2135 in6_ifa_put(ifp);
2136 } else {
2137 ipv6_del_addr(ifp);
2138 }
2139}
2140
2141static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2142{
2143 int err = -ENOENT;
2144
2145 spin_lock_bh(&ifp->lock);
2146 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2147 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2148 err = 0;
2149 }
2150 spin_unlock_bh(&ifp->lock);
2151
2152 return err;
2153}
2154
2155void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2156{
2157 struct inet6_dev *idev = ifp->idev;
2158 struct net *net = dev_net(idev->dev);
2159 int max_addresses;
2160
2161 if (addrconf_dad_end(ifp)) {
2162 in6_ifa_put(ifp);
2163 return;
2164 }
2165
2166 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2167 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2168
2169 spin_lock_bh(&ifp->lock);
2170
2171 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2172 struct in6_addr new_addr;
2173 struct inet6_ifaddr *ifp2;
2174 int retries = ifp->stable_privacy_retry + 1;
2175 struct ifa6_config cfg = {
2176 .pfx = &new_addr,
2177 .plen = ifp->prefix_len,
2178 .ifa_flags = ifp->flags,
2179 .valid_lft = ifp->valid_lft,
2180 .preferred_lft = ifp->prefered_lft,
2181 .scope = ifp->scope,
2182 };
2183
2184 if (retries > net->ipv6.sysctl.idgen_retries) {
2185 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2186 ifp->idev->dev->name);
2187 goto errdad;
2188 }
2189
2190 new_addr = ifp->addr;
2191 if (ipv6_generate_stable_address(&new_addr, retries,
2192 idev))
2193 goto errdad;
2194
2195 spin_unlock_bh(&ifp->lock);
2196
2197 max_addresses = READ_ONCE(idev->cnf.max_addresses);
2198 if (max_addresses &&
2199 ipv6_count_addresses(idev) >= max_addresses)
2200 goto lock_errdad;
2201
2202 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2203 ifp->idev->dev->name);
2204
2205 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2206 if (IS_ERR(ifp2))
2207 goto lock_errdad;
2208
2209 spin_lock_bh(&ifp2->lock);
2210 ifp2->stable_privacy_retry = retries;
2211 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2212 spin_unlock_bh(&ifp2->lock);
2213
2214 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2215 in6_ifa_put(ifp2);
2216lock_errdad:
2217 spin_lock_bh(&ifp->lock);
2218 }
2219
2220errdad:
2221 /* transition from _POSTDAD to _ERRDAD */
2222 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2223 spin_unlock_bh(&ifp->lock);
2224
2225 addrconf_mod_dad_work(ifp, 0);
2226 in6_ifa_put(ifp);
2227}
2228
2229/* Join to solicited addr multicast group.
2230 * caller must hold RTNL */
2231void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2232{
2233 struct in6_addr maddr;
2234
2235 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2236 return;
2237
2238 addrconf_addr_solict_mult(addr, &maddr);
2239 ipv6_dev_mc_inc(dev, &maddr);
2240}
2241
2242/* caller must hold RTNL */
2243void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2244{
2245 struct in6_addr maddr;
2246
2247 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2248 return;
2249
2250 addrconf_addr_solict_mult(addr, &maddr);
2251 __ipv6_dev_mc_dec(idev, &maddr);
2252}
2253
2254/* caller must hold RTNL */
2255static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2256{
2257 struct in6_addr addr;
2258
2259 if (ifp->prefix_len >= 127) /* RFC 6164 */
2260 return;
2261 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2262 if (ipv6_addr_any(&addr))
2263 return;
2264 __ipv6_dev_ac_inc(ifp->idev, &addr);
2265}
2266
2267/* caller must hold RTNL */
2268static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2269{
2270 struct in6_addr addr;
2271
2272 if (ifp->prefix_len >= 127) /* RFC 6164 */
2273 return;
2274 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2275 if (ipv6_addr_any(&addr))
2276 return;
2277 __ipv6_dev_ac_dec(ifp->idev, &addr);
2278}
2279
2280static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2281{
2282 switch (dev->addr_len) {
2283 case ETH_ALEN:
2284 memcpy(eui, dev->dev_addr, 3);
2285 eui[3] = 0xFF;
2286 eui[4] = 0xFE;
2287 memcpy(eui + 5, dev->dev_addr + 3, 3);
2288 break;
2289 case EUI64_ADDR_LEN:
2290 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2291 eui[0] ^= 2;
2292 break;
2293 default:
2294 return -1;
2295 }
2296
2297 return 0;
2298}
2299
2300static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2301{
2302 const union fwnet_hwaddr *ha;
2303
2304 if (dev->addr_len != FWNET_ALEN)
2305 return -1;
2306
2307 ha = (const union fwnet_hwaddr *)dev->dev_addr;
2308
2309 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2310 eui[0] ^= 2;
2311 return 0;
2312}
2313
2314static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2315{
2316 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2317 if (dev->addr_len != ARCNET_ALEN)
2318 return -1;
2319 memset(eui, 0, 7);
2320 eui[7] = *(u8 *)dev->dev_addr;
2321 return 0;
2322}
2323
2324static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2325{
2326 if (dev->addr_len != INFINIBAND_ALEN)
2327 return -1;
2328 memcpy(eui, dev->dev_addr + 12, 8);
2329 eui[0] |= 2;
2330 return 0;
2331}
2332
2333static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2334{
2335 if (addr == 0)
2336 return -1;
2337 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2338 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2339 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2340 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2341 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2342 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2343 eui[1] = 0;
2344 eui[2] = 0x5E;
2345 eui[3] = 0xFE;
2346 memcpy(eui + 4, &addr, 4);
2347 return 0;
2348}
2349
2350static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2351{
2352 if (dev->priv_flags & IFF_ISATAP)
2353 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2354 return -1;
2355}
2356
2357static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2358{
2359 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2360}
2361
2362static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2363{
2364 memcpy(eui, dev->perm_addr, 3);
2365 memcpy(eui + 5, dev->perm_addr + 3, 3);
2366 eui[3] = 0xFF;
2367 eui[4] = 0xFE;
2368 eui[0] ^= 2;
2369 return 0;
2370}
2371
2372static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2373{
2374 switch (dev->type) {
2375 case ARPHRD_ETHER:
2376 case ARPHRD_FDDI:
2377 return addrconf_ifid_eui48(eui, dev);
2378 case ARPHRD_ARCNET:
2379 return addrconf_ifid_arcnet(eui, dev);
2380 case ARPHRD_INFINIBAND:
2381 return addrconf_ifid_infiniband(eui, dev);
2382 case ARPHRD_SIT:
2383 return addrconf_ifid_sit(eui, dev);
2384 case ARPHRD_IPGRE:
2385 case ARPHRD_TUNNEL:
2386 return addrconf_ifid_gre(eui, dev);
2387 case ARPHRD_6LOWPAN:
2388 return addrconf_ifid_6lowpan(eui, dev);
2389 case ARPHRD_IEEE1394:
2390 return addrconf_ifid_ieee1394(eui, dev);
2391 case ARPHRD_TUNNEL6:
2392 case ARPHRD_IP6GRE:
2393 case ARPHRD_RAWIP:
2394 return addrconf_ifid_ip6tnl(eui, dev);
2395 }
2396 return -1;
2397}
2398
2399static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2400{
2401 int err = -1;
2402 struct inet6_ifaddr *ifp;
2403
2404 read_lock_bh(&idev->lock);
2405 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2406 if (ifp->scope > IFA_LINK)
2407 break;
2408 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2409 memcpy(eui, ifp->addr.s6_addr+8, 8);
2410 err = 0;
2411 break;
2412 }
2413 }
2414 read_unlock_bh(&idev->lock);
2415 return err;
2416}
2417
2418/* Generation of a randomized Interface Identifier
2419 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2420 */
2421
2422static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2423{
2424regen:
2425 get_random_bytes(&addr->s6_addr[8], 8);
2426
2427 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2428 * check if generated address is not inappropriate:
2429 *
2430 * - Reserved IPv6 Interface Identifiers
2431 * - XXX: already assigned to an address on the device
2432 */
2433
2434 /* Subnet-router anycast: 0000:0000:0000:0000 */
2435 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2436 goto regen;
2437
2438 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2439 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2440 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2441 */
2442 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2443 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2444 goto regen;
2445
2446 /* Reserved subnet anycast addresses */
2447 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2448 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2449 goto regen;
2450}
2451
2452/*
2453 * Add prefix route.
2454 */
2455
2456static void
2457addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2458 struct net_device *dev, unsigned long expires,
2459 u32 flags, gfp_t gfp_flags)
2460{
2461 struct fib6_config cfg = {
2462 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2463 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2464 .fc_ifindex = dev->ifindex,
2465 .fc_expires = expires,
2466 .fc_dst_len = plen,
2467 .fc_flags = RTF_UP | flags,
2468 .fc_nlinfo.nl_net = dev_net(dev),
2469 .fc_protocol = RTPROT_KERNEL,
2470 .fc_type = RTN_UNICAST,
2471 };
2472
2473 cfg.fc_dst = *pfx;
2474
2475 /* Prevent useless cloning on PtP SIT.
2476 This thing is done here expecting that the whole
2477 class of non-broadcast devices need not cloning.
2478 */
2479#if IS_ENABLED(CONFIG_IPV6_SIT)
2480 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2481 cfg.fc_flags |= RTF_NONEXTHOP;
2482#endif
2483
2484 ip6_route_add(&cfg, gfp_flags, NULL);
2485}
2486
2487
2488static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2489 int plen,
2490 const struct net_device *dev,
2491 u32 flags, u32 noflags,
2492 bool no_gw)
2493{
2494 struct fib6_node *fn;
2495 struct fib6_info *rt = NULL;
2496 struct fib6_table *table;
2497 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2498
2499 table = fib6_get_table(dev_net(dev), tb_id);
2500 if (!table)
2501 return NULL;
2502
2503 rcu_read_lock();
2504 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2505 if (!fn)
2506 goto out;
2507
2508 for_each_fib6_node_rt_rcu(fn) {
2509 /* prefix routes only use builtin fib6_nh */
2510 if (rt->nh)
2511 continue;
2512
2513 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2514 continue;
2515 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2516 continue;
2517 if ((rt->fib6_flags & flags) != flags)
2518 continue;
2519 if ((rt->fib6_flags & noflags) != 0)
2520 continue;
2521 if (!fib6_info_hold_safe(rt))
2522 continue;
2523 break;
2524 }
2525out:
2526 rcu_read_unlock();
2527 return rt;
2528}
2529
2530
2531/* Create "default" multicast route to the interface */
2532
2533static void addrconf_add_mroute(struct net_device *dev)
2534{
2535 struct fib6_config cfg = {
2536 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2537 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2538 .fc_ifindex = dev->ifindex,
2539 .fc_dst_len = 8,
2540 .fc_flags = RTF_UP,
2541 .fc_type = RTN_MULTICAST,
2542 .fc_nlinfo.nl_net = dev_net(dev),
2543 .fc_protocol = RTPROT_KERNEL,
2544 };
2545
2546 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2547
2548 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2549}
2550
2551static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2552{
2553 struct inet6_dev *idev;
2554
2555 ASSERT_RTNL();
2556
2557 idev = ipv6_find_idev(dev);
2558 if (IS_ERR(idev))
2559 return idev;
2560
2561 if (idev->cnf.disable_ipv6)
2562 return ERR_PTR(-EACCES);
2563
2564 /* Add default multicast route */
2565 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2566 addrconf_add_mroute(dev);
2567
2568 return idev;
2569}
2570
2571static void manage_tempaddrs(struct inet6_dev *idev,
2572 struct inet6_ifaddr *ifp,
2573 __u32 valid_lft, __u32 prefered_lft,
2574 bool create, unsigned long now)
2575{
2576 u32 flags;
2577 struct inet6_ifaddr *ift;
2578
2579 read_lock_bh(&idev->lock);
2580 /* update all temporary addresses in the list */
2581 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2582 int age, max_valid, max_prefered;
2583
2584 if (ifp != ift->ifpub)
2585 continue;
2586
2587 /* RFC 4941 section 3.3:
2588 * If a received option will extend the lifetime of a public
2589 * address, the lifetimes of temporary addresses should
2590 * be extended, subject to the overall constraint that no
2591 * temporary addresses should ever remain "valid" or "preferred"
2592 * for a time longer than (TEMP_VALID_LIFETIME) or
2593 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2594 */
2595 age = (now - ift->cstamp) / HZ;
2596 max_valid = READ_ONCE(idev->cnf.temp_valid_lft) - age;
2597 if (max_valid < 0)
2598 max_valid = 0;
2599
2600 max_prefered = READ_ONCE(idev->cnf.temp_prefered_lft) -
2601 idev->desync_factor - age;
2602 if (max_prefered < 0)
2603 max_prefered = 0;
2604
2605 if (valid_lft > max_valid)
2606 valid_lft = max_valid;
2607
2608 if (prefered_lft > max_prefered)
2609 prefered_lft = max_prefered;
2610
2611 spin_lock(&ift->lock);
2612 flags = ift->flags;
2613 ift->valid_lft = valid_lft;
2614 ift->prefered_lft = prefered_lft;
2615 ift->tstamp = now;
2616 if (prefered_lft > 0)
2617 ift->flags &= ~IFA_F_DEPRECATED;
2618
2619 spin_unlock(&ift->lock);
2620 if (!(flags&IFA_F_TENTATIVE))
2621 ipv6_ifa_notify(0, ift);
2622 }
2623
2624 /* Also create a temporary address if it's enabled but no temporary
2625 * address currently exists.
2626 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false
2627 * as part of cleanup (ie. deleting the mngtmpaddr).
2628 * We don't want that to result in creating a new temporary ip address.
2629 */
2630 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft))
2631 create = true;
2632
2633 if (create && READ_ONCE(idev->cnf.use_tempaddr) > 0) {
2634 /* When a new public address is created as described
2635 * in [ADDRCONF], also create a new temporary address.
2636 */
2637 read_unlock_bh(&idev->lock);
2638 ipv6_create_tempaddr(ifp, false);
2639 } else {
2640 read_unlock_bh(&idev->lock);
2641 }
2642}
2643
2644static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2645{
2646 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2647 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2648}
2649
2650int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2651 const struct prefix_info *pinfo,
2652 struct inet6_dev *in6_dev,
2653 const struct in6_addr *addr, int addr_type,
2654 u32 addr_flags, bool sllao, bool tokenized,
2655 __u32 valid_lft, u32 prefered_lft)
2656{
2657 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2658 int create = 0, update_lft = 0;
2659
2660 if (!ifp && valid_lft) {
2661 int max_addresses = READ_ONCE(in6_dev->cnf.max_addresses);
2662 struct ifa6_config cfg = {
2663 .pfx = addr,
2664 .plen = pinfo->prefix_len,
2665 .ifa_flags = addr_flags,
2666 .valid_lft = valid_lft,
2667 .preferred_lft = prefered_lft,
2668 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2669 .ifa_proto = IFAPROT_KERNEL_RA
2670 };
2671
2672#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2673 if ((READ_ONCE(net->ipv6.devconf_all->optimistic_dad) ||
2674 READ_ONCE(in6_dev->cnf.optimistic_dad)) &&
2675 !net->ipv6.devconf_all->forwarding && sllao)
2676 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2677#endif
2678
2679 /* Do not allow to create too much of autoconfigured
2680 * addresses; this would be too easy way to crash kernel.
2681 */
2682 if (!max_addresses ||
2683 ipv6_count_addresses(in6_dev) < max_addresses)
2684 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2685
2686 if (IS_ERR_OR_NULL(ifp))
2687 return -1;
2688
2689 create = 1;
2690 spin_lock_bh(&ifp->lock);
2691 ifp->flags |= IFA_F_MANAGETEMPADDR;
2692 ifp->cstamp = jiffies;
2693 ifp->tokenized = tokenized;
2694 spin_unlock_bh(&ifp->lock);
2695 addrconf_dad_start(ifp);
2696 }
2697
2698 if (ifp) {
2699 u32 flags;
2700 unsigned long now;
2701 u32 stored_lft;
2702
2703 /* update lifetime (RFC2462 5.5.3 e) */
2704 spin_lock_bh(&ifp->lock);
2705 now = jiffies;
2706 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2707 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2708 else
2709 stored_lft = 0;
2710
2711 /* RFC4862 Section 5.5.3e:
2712 * "Note that the preferred lifetime of the
2713 * corresponding address is always reset to
2714 * the Preferred Lifetime in the received
2715 * Prefix Information option, regardless of
2716 * whether the valid lifetime is also reset or
2717 * ignored."
2718 *
2719 * So we should always update prefered_lft here.
2720 */
2721 update_lft = !create && stored_lft;
2722
2723 if (update_lft && !READ_ONCE(in6_dev->cnf.ra_honor_pio_life)) {
2724 const u32 minimum_lft = min_t(u32,
2725 stored_lft, MIN_VALID_LIFETIME);
2726 valid_lft = max(valid_lft, minimum_lft);
2727 }
2728
2729 if (update_lft) {
2730 ifp->valid_lft = valid_lft;
2731 ifp->prefered_lft = prefered_lft;
2732 WRITE_ONCE(ifp->tstamp, now);
2733 flags = ifp->flags;
2734 ifp->flags &= ~IFA_F_DEPRECATED;
2735 spin_unlock_bh(&ifp->lock);
2736
2737 if (!(flags&IFA_F_TENTATIVE))
2738 ipv6_ifa_notify(0, ifp);
2739 } else
2740 spin_unlock_bh(&ifp->lock);
2741
2742 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2743 create, now);
2744
2745 in6_ifa_put(ifp);
2746 addrconf_verify(net);
2747 }
2748
2749 return 0;
2750}
2751EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2752
2753void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2754{
2755 struct prefix_info *pinfo;
2756 struct fib6_table *table;
2757 __u32 valid_lft;
2758 __u32 prefered_lft;
2759 int addr_type, err;
2760 u32 addr_flags = 0;
2761 struct inet6_dev *in6_dev;
2762 struct net *net = dev_net(dev);
2763
2764 pinfo = (struct prefix_info *) opt;
2765
2766 if (len < sizeof(struct prefix_info)) {
2767 netdev_dbg(dev, "addrconf: prefix option too short\n");
2768 return;
2769 }
2770
2771 /*
2772 * Validation checks ([ADDRCONF], page 19)
2773 */
2774
2775 addr_type = ipv6_addr_type(&pinfo->prefix);
2776
2777 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2778 return;
2779
2780 valid_lft = ntohl(pinfo->valid);
2781 prefered_lft = ntohl(pinfo->prefered);
2782
2783 if (prefered_lft > valid_lft) {
2784 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2785 return;
2786 }
2787
2788 in6_dev = in6_dev_get(dev);
2789
2790 if (!in6_dev) {
2791 net_dbg_ratelimited("addrconf: device %s not configured\n",
2792 dev->name);
2793 return;
2794 }
2795
2796 if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft)
2797 goto put;
2798
2799 /*
2800 * Two things going on here:
2801 * 1) Add routes for on-link prefixes
2802 * 2) Configure prefixes with the auto flag set
2803 */
2804
2805 if (pinfo->onlink) {
2806 struct fib6_info *rt;
2807 unsigned long rt_expires;
2808
2809 /* Avoid arithmetic overflow. Really, we could
2810 * save rt_expires in seconds, likely valid_lft,
2811 * but it would require division in fib gc, that it
2812 * not good.
2813 */
2814 if (HZ > USER_HZ)
2815 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2816 else
2817 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2818
2819 if (addrconf_finite_timeout(rt_expires))
2820 rt_expires *= HZ;
2821
2822 rt = addrconf_get_prefix_route(&pinfo->prefix,
2823 pinfo->prefix_len,
2824 dev,
2825 RTF_ADDRCONF | RTF_PREFIX_RT,
2826 RTF_DEFAULT, true);
2827
2828 if (rt) {
2829 /* Autoconf prefix route */
2830 if (valid_lft == 0) {
2831 ip6_del_rt(net, rt, false);
2832 rt = NULL;
2833 } else {
2834 table = rt->fib6_table;
2835 spin_lock_bh(&table->tb6_lock);
2836
2837 if (addrconf_finite_timeout(rt_expires)) {
2838 /* not infinity */
2839 fib6_set_expires(rt, jiffies + rt_expires);
2840 fib6_add_gc_list(rt);
2841 } else {
2842 fib6_clean_expires(rt);
2843 fib6_remove_gc_list(rt);
2844 }
2845
2846 spin_unlock_bh(&table->tb6_lock);
2847 }
2848 } else if (valid_lft) {
2849 clock_t expires = 0;
2850 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2851 if (addrconf_finite_timeout(rt_expires)) {
2852 /* not infinity */
2853 flags |= RTF_EXPIRES;
2854 expires = jiffies_to_clock_t(rt_expires);
2855 }
2856 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2857 0, dev, expires, flags,
2858 GFP_ATOMIC);
2859 }
2860 fib6_info_release(rt);
2861 }
2862
2863 /* Try to figure out our local address for this prefix */
2864
2865 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2866 struct in6_addr addr;
2867 bool tokenized = false, dev_addr_generated = false;
2868
2869 if (pinfo->prefix_len == 64) {
2870 memcpy(&addr, &pinfo->prefix, 8);
2871
2872 if (!ipv6_addr_any(&in6_dev->token)) {
2873 read_lock_bh(&in6_dev->lock);
2874 memcpy(addr.s6_addr + 8,
2875 in6_dev->token.s6_addr + 8, 8);
2876 read_unlock_bh(&in6_dev->lock);
2877 tokenized = true;
2878 } else if (is_addr_mode_generate_stable(in6_dev) &&
2879 !ipv6_generate_stable_address(&addr, 0,
2880 in6_dev)) {
2881 addr_flags |= IFA_F_STABLE_PRIVACY;
2882 goto ok;
2883 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2884 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2885 goto put;
2886 } else {
2887 dev_addr_generated = true;
2888 }
2889 goto ok;
2890 }
2891 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2892 pinfo->prefix_len);
2893 goto put;
2894
2895ok:
2896 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2897 &addr, addr_type,
2898 addr_flags, sllao,
2899 tokenized, valid_lft,
2900 prefered_lft);
2901 if (err)
2902 goto put;
2903
2904 /* Ignore error case here because previous prefix add addr was
2905 * successful which will be notified.
2906 */
2907 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2908 addr_type, addr_flags, sllao,
2909 tokenized, valid_lft,
2910 prefered_lft,
2911 dev_addr_generated);
2912 }
2913 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2914put:
2915 in6_dev_put(in6_dev);
2916}
2917
2918static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2919 struct in6_ifreq *ireq)
2920{
2921 struct ip_tunnel_parm p = { };
2922 int err;
2923
2924 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2925 return -EADDRNOTAVAIL;
2926
2927 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2928 p.iph.version = 4;
2929 p.iph.ihl = 5;
2930 p.iph.protocol = IPPROTO_IPV6;
2931 p.iph.ttl = 64;
2932
2933 if (!dev->netdev_ops->ndo_tunnel_ctl)
2934 return -EOPNOTSUPP;
2935 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2936 if (err)
2937 return err;
2938
2939 dev = __dev_get_by_name(net, p.name);
2940 if (!dev)
2941 return -ENOBUFS;
2942 return dev_open(dev, NULL);
2943}
2944
2945/*
2946 * Set destination address.
2947 * Special case for SIT interfaces where we create a new "virtual"
2948 * device.
2949 */
2950int addrconf_set_dstaddr(struct net *net, void __user *arg)
2951{
2952 struct net_device *dev;
2953 struct in6_ifreq ireq;
2954 int err = -ENODEV;
2955
2956 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2957 return -ENODEV;
2958 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2959 return -EFAULT;
2960
2961 rtnl_lock();
2962 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2963 if (dev && dev->type == ARPHRD_SIT)
2964 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2965 rtnl_unlock();
2966 return err;
2967}
2968
2969static int ipv6_mc_config(struct sock *sk, bool join,
2970 const struct in6_addr *addr, int ifindex)
2971{
2972 int ret;
2973
2974 ASSERT_RTNL();
2975
2976 lock_sock(sk);
2977 if (join)
2978 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2979 else
2980 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2981 release_sock(sk);
2982
2983 return ret;
2984}
2985
2986/*
2987 * Manual configuration of address on an interface
2988 */
2989static int inet6_addr_add(struct net *net, int ifindex,
2990 struct ifa6_config *cfg,
2991 struct netlink_ext_ack *extack)
2992{
2993 struct inet6_ifaddr *ifp;
2994 struct inet6_dev *idev;
2995 struct net_device *dev;
2996 unsigned long timeout;
2997 clock_t expires;
2998 u32 flags;
2999
3000 ASSERT_RTNL();
3001
3002 if (cfg->plen > 128) {
3003 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
3004 return -EINVAL;
3005 }
3006
3007 /* check the lifetime */
3008 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) {
3009 NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid");
3010 return -EINVAL;
3011 }
3012
3013 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) {
3014 NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64");
3015 return -EINVAL;
3016 }
3017
3018 dev = __dev_get_by_index(net, ifindex);
3019 if (!dev)
3020 return -ENODEV;
3021
3022 idev = addrconf_add_dev(dev);
3023 if (IS_ERR(idev)) {
3024 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
3025 return PTR_ERR(idev);
3026 }
3027
3028 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3029 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3030 true, cfg->pfx, ifindex);
3031
3032 if (ret < 0) {
3033 NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed");
3034 return ret;
3035 }
3036 }
3037
3038 cfg->scope = ipv6_addr_scope(cfg->pfx);
3039
3040 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
3041 if (addrconf_finite_timeout(timeout)) {
3042 expires = jiffies_to_clock_t(timeout * HZ);
3043 cfg->valid_lft = timeout;
3044 flags = RTF_EXPIRES;
3045 } else {
3046 expires = 0;
3047 flags = 0;
3048 cfg->ifa_flags |= IFA_F_PERMANENT;
3049 }
3050
3051 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
3052 if (addrconf_finite_timeout(timeout)) {
3053 if (timeout == 0)
3054 cfg->ifa_flags |= IFA_F_DEPRECATED;
3055 cfg->preferred_lft = timeout;
3056 }
3057
3058 ifp = ipv6_add_addr(idev, cfg, true, extack);
3059 if (!IS_ERR(ifp)) {
3060 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
3061 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3062 ifp->rt_priority, dev, expires,
3063 flags, GFP_KERNEL);
3064 }
3065
3066 /* Send a netlink notification if DAD is enabled and
3067 * optimistic flag is not set
3068 */
3069 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
3070 ipv6_ifa_notify(0, ifp);
3071 /*
3072 * Note that section 3.1 of RFC 4429 indicates
3073 * that the Optimistic flag should not be set for
3074 * manually configured addresses
3075 */
3076 addrconf_dad_start(ifp);
3077 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
3078 manage_tempaddrs(idev, ifp, cfg->valid_lft,
3079 cfg->preferred_lft, true, jiffies);
3080 in6_ifa_put(ifp);
3081 addrconf_verify_rtnl(net);
3082 return 0;
3083 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3084 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
3085 cfg->pfx, ifindex);
3086 }
3087
3088 return PTR_ERR(ifp);
3089}
3090
3091static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3092 const struct in6_addr *pfx, unsigned int plen,
3093 struct netlink_ext_ack *extack)
3094{
3095 struct inet6_ifaddr *ifp;
3096 struct inet6_dev *idev;
3097 struct net_device *dev;
3098
3099 if (plen > 128) {
3100 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
3101 return -EINVAL;
3102 }
3103
3104 dev = __dev_get_by_index(net, ifindex);
3105 if (!dev) {
3106 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
3107 return -ENODEV;
3108 }
3109
3110 idev = __in6_dev_get(dev);
3111 if (!idev) {
3112 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
3113 return -ENXIO;
3114 }
3115
3116 read_lock_bh(&idev->lock);
3117 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3118 if (ifp->prefix_len == plen &&
3119 ipv6_addr_equal(pfx, &ifp->addr)) {
3120 in6_ifa_hold(ifp);
3121 read_unlock_bh(&idev->lock);
3122
3123 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3124 (ifa_flags & IFA_F_MANAGETEMPADDR))
3125 manage_tempaddrs(idev, ifp, 0, 0, false,
3126 jiffies);
3127 ipv6_del_addr(ifp);
3128 addrconf_verify_rtnl(net);
3129 if (ipv6_addr_is_multicast(pfx)) {
3130 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3131 false, pfx, dev->ifindex);
3132 }
3133 return 0;
3134 }
3135 }
3136 read_unlock_bh(&idev->lock);
3137
3138 NL_SET_ERR_MSG_MOD(extack, "address not found");
3139 return -EADDRNOTAVAIL;
3140}
3141
3142
3143int addrconf_add_ifaddr(struct net *net, void __user *arg)
3144{
3145 struct ifa6_config cfg = {
3146 .ifa_flags = IFA_F_PERMANENT,
3147 .preferred_lft = INFINITY_LIFE_TIME,
3148 .valid_lft = INFINITY_LIFE_TIME,
3149 };
3150 struct in6_ifreq ireq;
3151 int err;
3152
3153 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3154 return -EPERM;
3155
3156 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3157 return -EFAULT;
3158
3159 cfg.pfx = &ireq.ifr6_addr;
3160 cfg.plen = ireq.ifr6_prefixlen;
3161
3162 rtnl_lock();
3163 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3164 rtnl_unlock();
3165 return err;
3166}
3167
3168int addrconf_del_ifaddr(struct net *net, void __user *arg)
3169{
3170 struct in6_ifreq ireq;
3171 int err;
3172
3173 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3174 return -EPERM;
3175
3176 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3177 return -EFAULT;
3178
3179 rtnl_lock();
3180 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3181 ireq.ifr6_prefixlen, NULL);
3182 rtnl_unlock();
3183 return err;
3184}
3185
3186static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3187 int plen, int scope, u8 proto)
3188{
3189 struct inet6_ifaddr *ifp;
3190 struct ifa6_config cfg = {
3191 .pfx = addr,
3192 .plen = plen,
3193 .ifa_flags = IFA_F_PERMANENT,
3194 .valid_lft = INFINITY_LIFE_TIME,
3195 .preferred_lft = INFINITY_LIFE_TIME,
3196 .scope = scope,
3197 .ifa_proto = proto
3198 };
3199
3200 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3201 if (!IS_ERR(ifp)) {
3202 spin_lock_bh(&ifp->lock);
3203 ifp->flags &= ~IFA_F_TENTATIVE;
3204 spin_unlock_bh(&ifp->lock);
3205 rt_genid_bump_ipv6(dev_net(idev->dev));
3206 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3207 in6_ifa_put(ifp);
3208 }
3209}
3210
3211#if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3212static void add_v4_addrs(struct inet6_dev *idev)
3213{
3214 struct in6_addr addr;
3215 struct net_device *dev;
3216 struct net *net = dev_net(idev->dev);
3217 int scope, plen, offset = 0;
3218 u32 pflags = 0;
3219
3220 ASSERT_RTNL();
3221
3222 memset(&addr, 0, sizeof(struct in6_addr));
3223 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */
3224 if (idev->dev->addr_len == sizeof(struct in6_addr))
3225 offset = sizeof(struct in6_addr) - 4;
3226 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
3227
3228 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) {
3229 scope = IPV6_ADDR_COMPATv4;
3230 plen = 96;
3231 pflags |= RTF_NONEXTHOP;
3232 } else {
3233 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3234 return;
3235
3236 addr.s6_addr32[0] = htonl(0xfe800000);
3237 scope = IFA_LINK;
3238 plen = 64;
3239 }
3240
3241 if (addr.s6_addr32[3]) {
3242 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC);
3243 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3244 GFP_KERNEL);
3245 return;
3246 }
3247
3248 for_each_netdev(net, dev) {
3249 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3250 if (in_dev && (dev->flags & IFF_UP)) {
3251 struct in_ifaddr *ifa;
3252 int flag = scope;
3253
3254 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3255 addr.s6_addr32[3] = ifa->ifa_local;
3256
3257 if (ifa->ifa_scope == RT_SCOPE_LINK)
3258 continue;
3259 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3260 if (idev->dev->flags&IFF_POINTOPOINT)
3261 continue;
3262 flag |= IFA_HOST;
3263 }
3264
3265 add_addr(idev, &addr, plen, flag,
3266 IFAPROT_UNSPEC);
3267 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3268 0, pflags, GFP_KERNEL);
3269 }
3270 }
3271 }
3272}
3273#endif
3274
3275static void init_loopback(struct net_device *dev)
3276{
3277 struct inet6_dev *idev;
3278
3279 /* ::1 */
3280
3281 ASSERT_RTNL();
3282
3283 idev = ipv6_find_idev(dev);
3284 if (IS_ERR(idev)) {
3285 pr_debug("%s: add_dev failed\n", __func__);
3286 return;
3287 }
3288
3289 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO);
3290}
3291
3292void addrconf_add_linklocal(struct inet6_dev *idev,
3293 const struct in6_addr *addr, u32 flags)
3294{
3295 struct ifa6_config cfg = {
3296 .pfx = addr,
3297 .plen = 64,
3298 .ifa_flags = flags | IFA_F_PERMANENT,
3299 .valid_lft = INFINITY_LIFE_TIME,
3300 .preferred_lft = INFINITY_LIFE_TIME,
3301 .scope = IFA_LINK,
3302 .ifa_proto = IFAPROT_KERNEL_LL
3303 };
3304 struct inet6_ifaddr *ifp;
3305
3306#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3307 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad) ||
3308 READ_ONCE(idev->cnf.optimistic_dad)) &&
3309 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3310 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3311#endif
3312
3313 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3314 if (!IS_ERR(ifp)) {
3315 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3316 0, 0, GFP_ATOMIC);
3317 addrconf_dad_start(ifp);
3318 in6_ifa_put(ifp);
3319 }
3320}
3321EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3322
3323static bool ipv6_reserved_interfaceid(struct in6_addr address)
3324{
3325 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3326 return true;
3327
3328 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3329 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3330 return true;
3331
3332 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3333 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3334 return true;
3335
3336 return false;
3337}
3338
3339static int ipv6_generate_stable_address(struct in6_addr *address,
3340 u8 dad_count,
3341 const struct inet6_dev *idev)
3342{
3343 static DEFINE_SPINLOCK(lock);
3344 static __u32 digest[SHA1_DIGEST_WORDS];
3345 static __u32 workspace[SHA1_WORKSPACE_WORDS];
3346
3347 static union {
3348 char __data[SHA1_BLOCK_SIZE];
3349 struct {
3350 struct in6_addr secret;
3351 __be32 prefix[2];
3352 unsigned char hwaddr[MAX_ADDR_LEN];
3353 u8 dad_count;
3354 } __packed;
3355 } data;
3356
3357 struct in6_addr secret;
3358 struct in6_addr temp;
3359 struct net *net = dev_net(idev->dev);
3360
3361 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3362
3363 if (idev->cnf.stable_secret.initialized)
3364 secret = idev->cnf.stable_secret.secret;
3365 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3366 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3367 else
3368 return -1;
3369
3370retry:
3371 spin_lock_bh(&lock);
3372
3373 sha1_init(digest);
3374 memset(&data, 0, sizeof(data));
3375 memset(workspace, 0, sizeof(workspace));
3376 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3377 data.prefix[0] = address->s6_addr32[0];
3378 data.prefix[1] = address->s6_addr32[1];
3379 data.secret = secret;
3380 data.dad_count = dad_count;
3381
3382 sha1_transform(digest, data.__data, workspace);
3383
3384 temp = *address;
3385 temp.s6_addr32[2] = (__force __be32)digest[0];
3386 temp.s6_addr32[3] = (__force __be32)digest[1];
3387
3388 spin_unlock_bh(&lock);
3389
3390 if (ipv6_reserved_interfaceid(temp)) {
3391 dad_count++;
3392 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3393 return -1;
3394 goto retry;
3395 }
3396
3397 *address = temp;
3398 return 0;
3399}
3400
3401static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3402{
3403 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3404
3405 if (s->initialized)
3406 return;
3407 s = &idev->cnf.stable_secret;
3408 get_random_bytes(&s->secret, sizeof(s->secret));
3409 s->initialized = true;
3410}
3411
3412static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3413{
3414 struct in6_addr addr;
3415
3416 /* no link local addresses on L3 master devices */
3417 if (netif_is_l3_master(idev->dev))
3418 return;
3419
3420 /* no link local addresses on devices flagged as slaves */
3421 if (idev->dev->priv_flags & IFF_NO_ADDRCONF)
3422 return;
3423
3424 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3425
3426 switch (idev->cnf.addr_gen_mode) {
3427 case IN6_ADDR_GEN_MODE_RANDOM:
3428 ipv6_gen_mode_random_init(idev);
3429 fallthrough;
3430 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3431 if (!ipv6_generate_stable_address(&addr, 0, idev))
3432 addrconf_add_linklocal(idev, &addr,
3433 IFA_F_STABLE_PRIVACY);
3434 else if (prefix_route)
3435 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3436 0, 0, GFP_KERNEL);
3437 break;
3438 case IN6_ADDR_GEN_MODE_EUI64:
3439 /* addrconf_add_linklocal also adds a prefix_route and we
3440 * only need to care about prefix routes if ipv6_generate_eui64
3441 * couldn't generate one.
3442 */
3443 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3444 addrconf_add_linklocal(idev, &addr, 0);
3445 else if (prefix_route)
3446 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3447 0, 0, GFP_KERNEL);
3448 break;
3449 case IN6_ADDR_GEN_MODE_NONE:
3450 default:
3451 /* will not add any link local address */
3452 break;
3453 }
3454}
3455
3456static void addrconf_dev_config(struct net_device *dev)
3457{
3458 struct inet6_dev *idev;
3459
3460 ASSERT_RTNL();
3461
3462 if ((dev->type != ARPHRD_ETHER) &&
3463 (dev->type != ARPHRD_FDDI) &&
3464 (dev->type != ARPHRD_ARCNET) &&
3465 (dev->type != ARPHRD_INFINIBAND) &&
3466 (dev->type != ARPHRD_IEEE1394) &&
3467 (dev->type != ARPHRD_TUNNEL6) &&
3468 (dev->type != ARPHRD_6LOWPAN) &&
3469 (dev->type != ARPHRD_TUNNEL) &&
3470 (dev->type != ARPHRD_NONE) &&
3471 (dev->type != ARPHRD_RAWIP)) {
3472 /* Alas, we support only Ethernet autoconfiguration. */
3473 idev = __in6_dev_get(dev);
3474 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3475 dev->flags & IFF_MULTICAST)
3476 ipv6_mc_up(idev);
3477 return;
3478 }
3479
3480 idev = addrconf_add_dev(dev);
3481 if (IS_ERR(idev))
3482 return;
3483
3484 /* this device type has no EUI support */
3485 if (dev->type == ARPHRD_NONE &&
3486 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3487 WRITE_ONCE(idev->cnf.addr_gen_mode,
3488 IN6_ADDR_GEN_MODE_RANDOM);
3489
3490 addrconf_addr_gen(idev, false);
3491}
3492
3493#if IS_ENABLED(CONFIG_IPV6_SIT)
3494static void addrconf_sit_config(struct net_device *dev)
3495{
3496 struct inet6_dev *idev;
3497
3498 ASSERT_RTNL();
3499
3500 /*
3501 * Configure the tunnel with one of our IPv4
3502 * addresses... we should configure all of
3503 * our v4 addrs in the tunnel
3504 */
3505
3506 idev = ipv6_find_idev(dev);
3507 if (IS_ERR(idev)) {
3508 pr_debug("%s: add_dev failed\n", __func__);
3509 return;
3510 }
3511
3512 if (dev->priv_flags & IFF_ISATAP) {
3513 addrconf_addr_gen(idev, false);
3514 return;
3515 }
3516
3517 add_v4_addrs(idev);
3518
3519 if (dev->flags&IFF_POINTOPOINT)
3520 addrconf_add_mroute(dev);
3521}
3522#endif
3523
3524#if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3525static void addrconf_gre_config(struct net_device *dev)
3526{
3527 struct inet6_dev *idev;
3528
3529 ASSERT_RTNL();
3530
3531 idev = ipv6_find_idev(dev);
3532 if (IS_ERR(idev)) {
3533 pr_debug("%s: add_dev failed\n", __func__);
3534 return;
3535 }
3536
3537 if (dev->type == ARPHRD_ETHER) {
3538 addrconf_addr_gen(idev, true);
3539 return;
3540 }
3541
3542 add_v4_addrs(idev);
3543
3544 if (dev->flags & IFF_POINTOPOINT)
3545 addrconf_add_mroute(dev);
3546}
3547#endif
3548
3549static void addrconf_init_auto_addrs(struct net_device *dev)
3550{
3551 switch (dev->type) {
3552#if IS_ENABLED(CONFIG_IPV6_SIT)
3553 case ARPHRD_SIT:
3554 addrconf_sit_config(dev);
3555 break;
3556#endif
3557#if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3558 case ARPHRD_IP6GRE:
3559 case ARPHRD_IPGRE:
3560 addrconf_gre_config(dev);
3561 break;
3562#endif
3563 case ARPHRD_LOOPBACK:
3564 init_loopback(dev);
3565 break;
3566
3567 default:
3568 addrconf_dev_config(dev);
3569 break;
3570 }
3571}
3572
3573static int fixup_permanent_addr(struct net *net,
3574 struct inet6_dev *idev,
3575 struct inet6_ifaddr *ifp)
3576{
3577 /* !fib6_node means the host route was removed from the
3578 * FIB, for example, if 'lo' device is taken down. In that
3579 * case regenerate the host route.
3580 */
3581 if (!ifp->rt || !ifp->rt->fib6_node) {
3582 struct fib6_info *f6i, *prev;
3583
3584 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3585 GFP_ATOMIC, NULL);
3586 if (IS_ERR(f6i))
3587 return PTR_ERR(f6i);
3588
3589 /* ifp->rt can be accessed outside of rtnl */
3590 spin_lock(&ifp->lock);
3591 prev = ifp->rt;
3592 ifp->rt = f6i;
3593 spin_unlock(&ifp->lock);
3594
3595 fib6_info_release(prev);
3596 }
3597
3598 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3599 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3600 ifp->rt_priority, idev->dev, 0, 0,
3601 GFP_ATOMIC);
3602 }
3603
3604 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3605 addrconf_dad_start(ifp);
3606
3607 return 0;
3608}
3609
3610static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3611{
3612 struct inet6_ifaddr *ifp, *tmp;
3613 struct inet6_dev *idev;
3614
3615 idev = __in6_dev_get(dev);
3616 if (!idev)
3617 return;
3618
3619 write_lock_bh(&idev->lock);
3620
3621 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3622 if ((ifp->flags & IFA_F_PERMANENT) &&
3623 fixup_permanent_addr(net, idev, ifp) < 0) {
3624 write_unlock_bh(&idev->lock);
3625 in6_ifa_hold(ifp);
3626 ipv6_del_addr(ifp);
3627 write_lock_bh(&idev->lock);
3628
3629 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3630 idev->dev->name, &ifp->addr);
3631 }
3632 }
3633
3634 write_unlock_bh(&idev->lock);
3635}
3636
3637static int addrconf_notify(struct notifier_block *this, unsigned long event,
3638 void *ptr)
3639{
3640 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3641 struct netdev_notifier_change_info *change_info;
3642 struct netdev_notifier_changeupper_info *info;
3643 struct inet6_dev *idev = __in6_dev_get(dev);
3644 struct net *net = dev_net(dev);
3645 int run_pending = 0;
3646 int err;
3647
3648 switch (event) {
3649 case NETDEV_REGISTER:
3650 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3651 idev = ipv6_add_dev(dev);
3652 if (IS_ERR(idev))
3653 return notifier_from_errno(PTR_ERR(idev));
3654 }
3655 break;
3656
3657 case NETDEV_CHANGEMTU:
3658 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3659 if (dev->mtu < IPV6_MIN_MTU) {
3660 addrconf_ifdown(dev, dev != net->loopback_dev);
3661 break;
3662 }
3663
3664 if (idev) {
3665 rt6_mtu_change(dev, dev->mtu);
3666 WRITE_ONCE(idev->cnf.mtu6, dev->mtu);
3667 break;
3668 }
3669
3670 /* allocate new idev */
3671 idev = ipv6_add_dev(dev);
3672 if (IS_ERR(idev))
3673 break;
3674
3675 /* device is still not ready */
3676 if (!(idev->if_flags & IF_READY))
3677 break;
3678
3679 run_pending = 1;
3680 fallthrough;
3681 case NETDEV_UP:
3682 case NETDEV_CHANGE:
3683 if (idev && idev->cnf.disable_ipv6)
3684 break;
3685
3686 if (dev->priv_flags & IFF_NO_ADDRCONF) {
3687 if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) &&
3688 dev->flags & IFF_UP && dev->flags & IFF_MULTICAST)
3689 ipv6_mc_up(idev);
3690 break;
3691 }
3692
3693 if (event == NETDEV_UP) {
3694 /* restore routes for permanent addresses */
3695 addrconf_permanent_addr(net, dev);
3696
3697 if (!addrconf_link_ready(dev)) {
3698 /* device is not ready yet. */
3699 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3700 dev->name);
3701 break;
3702 }
3703
3704 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3705 idev = ipv6_add_dev(dev);
3706
3707 if (!IS_ERR_OR_NULL(idev)) {
3708 idev->if_flags |= IF_READY;
3709 run_pending = 1;
3710 }
3711 } else if (event == NETDEV_CHANGE) {
3712 if (!addrconf_link_ready(dev)) {
3713 /* device is still not ready. */
3714 rt6_sync_down_dev(dev, event);
3715 break;
3716 }
3717
3718 if (!IS_ERR_OR_NULL(idev)) {
3719 if (idev->if_flags & IF_READY) {
3720 /* device is already configured -
3721 * but resend MLD reports, we might
3722 * have roamed and need to update
3723 * multicast snooping switches
3724 */
3725 ipv6_mc_up(idev);
3726 change_info = ptr;
3727 if (change_info->flags_changed & IFF_NOARP)
3728 addrconf_dad_run(idev, true);
3729 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3730 break;
3731 }
3732 idev->if_flags |= IF_READY;
3733 }
3734
3735 pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3736 dev->name);
3737
3738 run_pending = 1;
3739 }
3740
3741 addrconf_init_auto_addrs(dev);
3742
3743 if (!IS_ERR_OR_NULL(idev)) {
3744 if (run_pending)
3745 addrconf_dad_run(idev, false);
3746
3747 /* Device has an address by now */
3748 rt6_sync_up(dev, RTNH_F_DEAD);
3749
3750 /*
3751 * If the MTU changed during the interface down,
3752 * when the interface up, the changed MTU must be
3753 * reflected in the idev as well as routers.
3754 */
3755 if (idev->cnf.mtu6 != dev->mtu &&
3756 dev->mtu >= IPV6_MIN_MTU) {
3757 rt6_mtu_change(dev, dev->mtu);
3758 WRITE_ONCE(idev->cnf.mtu6, dev->mtu);
3759 }
3760 WRITE_ONCE(idev->tstamp, jiffies);
3761 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3762
3763 /*
3764 * If the changed mtu during down is lower than
3765 * IPV6_MIN_MTU stop IPv6 on this interface.
3766 */
3767 if (dev->mtu < IPV6_MIN_MTU)
3768 addrconf_ifdown(dev, dev != net->loopback_dev);
3769 }
3770 break;
3771
3772 case NETDEV_DOWN:
3773 case NETDEV_UNREGISTER:
3774 /*
3775 * Remove all addresses from this interface.
3776 */
3777 addrconf_ifdown(dev, event != NETDEV_DOWN);
3778 break;
3779
3780 case NETDEV_CHANGENAME:
3781 if (idev) {
3782 snmp6_unregister_dev(idev);
3783 addrconf_sysctl_unregister(idev);
3784 err = addrconf_sysctl_register(idev);
3785 if (err)
3786 return notifier_from_errno(err);
3787 err = snmp6_register_dev(idev);
3788 if (err) {
3789 addrconf_sysctl_unregister(idev);
3790 return notifier_from_errno(err);
3791 }
3792 }
3793 break;
3794
3795 case NETDEV_PRE_TYPE_CHANGE:
3796 case NETDEV_POST_TYPE_CHANGE:
3797 if (idev)
3798 addrconf_type_change(dev, event);
3799 break;
3800
3801 case NETDEV_CHANGEUPPER:
3802 info = ptr;
3803
3804 /* flush all routes if dev is linked to or unlinked from
3805 * an L3 master device (e.g., VRF)
3806 */
3807 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3808 addrconf_ifdown(dev, false);
3809 }
3810
3811 return NOTIFY_OK;
3812}
3813
3814/*
3815 * addrconf module should be notified of a device going up
3816 */
3817static struct notifier_block ipv6_dev_notf = {
3818 .notifier_call = addrconf_notify,
3819 .priority = ADDRCONF_NOTIFY_PRIORITY,
3820};
3821
3822static void addrconf_type_change(struct net_device *dev, unsigned long event)
3823{
3824 struct inet6_dev *idev;
3825 ASSERT_RTNL();
3826
3827 idev = __in6_dev_get(dev);
3828
3829 if (event == NETDEV_POST_TYPE_CHANGE)
3830 ipv6_mc_remap(idev);
3831 else if (event == NETDEV_PRE_TYPE_CHANGE)
3832 ipv6_mc_unmap(idev);
3833}
3834
3835static bool addr_is_local(const struct in6_addr *addr)
3836{
3837 return ipv6_addr_type(addr) &
3838 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3839}
3840
3841static int addrconf_ifdown(struct net_device *dev, bool unregister)
3842{
3843 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3844 struct net *net = dev_net(dev);
3845 struct inet6_dev *idev;
3846 struct inet6_ifaddr *ifa;
3847 LIST_HEAD(tmp_addr_list);
3848 bool keep_addr = false;
3849 bool was_ready;
3850 int state, i;
3851
3852 ASSERT_RTNL();
3853
3854 rt6_disable_ip(dev, event);
3855
3856 idev = __in6_dev_get(dev);
3857 if (!idev)
3858 return -ENODEV;
3859
3860 /*
3861 * Step 1: remove reference to ipv6 device from parent device.
3862 * Do not dev_put!
3863 */
3864 if (unregister) {
3865 idev->dead = 1;
3866
3867 /* protected by rtnl_lock */
3868 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3869
3870 /* Step 1.5: remove snmp6 entry */
3871 snmp6_unregister_dev(idev);
3872
3873 }
3874
3875 /* combine the user config with event to determine if permanent
3876 * addresses are to be removed from address hash table
3877 */
3878 if (!unregister && !idev->cnf.disable_ipv6) {
3879 /* aggregate the system setting and interface setting */
3880 int _keep_addr = READ_ONCE(net->ipv6.devconf_all->keep_addr_on_down);
3881
3882 if (!_keep_addr)
3883 _keep_addr = READ_ONCE(idev->cnf.keep_addr_on_down);
3884
3885 keep_addr = (_keep_addr > 0);
3886 }
3887
3888 /* Step 2: clear hash table */
3889 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3890 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i];
3891
3892 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
3893restart:
3894 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3895 if (ifa->idev == idev) {
3896 addrconf_del_dad_work(ifa);
3897 /* combined flag + permanent flag decide if
3898 * address is retained on a down event
3899 */
3900 if (!keep_addr ||
3901 !(ifa->flags & IFA_F_PERMANENT) ||
3902 addr_is_local(&ifa->addr)) {
3903 hlist_del_init_rcu(&ifa->addr_lst);
3904 goto restart;
3905 }
3906 }
3907 }
3908 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
3909 }
3910
3911 write_lock_bh(&idev->lock);
3912
3913 addrconf_del_rs_timer(idev);
3914
3915 /* Step 2: clear flags for stateless addrconf, repeated down
3916 * detection
3917 */
3918 was_ready = idev->if_flags & IF_READY;
3919 if (!unregister)
3920 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3921
3922 /* Step 3: clear tempaddr list */
3923 while (!list_empty(&idev->tempaddr_list)) {
3924 ifa = list_first_entry(&idev->tempaddr_list,
3925 struct inet6_ifaddr, tmp_list);
3926 list_del(&ifa->tmp_list);
3927 write_unlock_bh(&idev->lock);
3928 spin_lock_bh(&ifa->lock);
3929
3930 if (ifa->ifpub) {
3931 in6_ifa_put(ifa->ifpub);
3932 ifa->ifpub = NULL;
3933 }
3934 spin_unlock_bh(&ifa->lock);
3935 in6_ifa_put(ifa);
3936 write_lock_bh(&idev->lock);
3937 }
3938
3939 list_for_each_entry(ifa, &idev->addr_list, if_list)
3940 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3941 write_unlock_bh(&idev->lock);
3942
3943 while (!list_empty(&tmp_addr_list)) {
3944 struct fib6_info *rt = NULL;
3945 bool keep;
3946
3947 ifa = list_first_entry(&tmp_addr_list,
3948 struct inet6_ifaddr, if_list_aux);
3949 list_del(&ifa->if_list_aux);
3950
3951 addrconf_del_dad_work(ifa);
3952
3953 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3954 !addr_is_local(&ifa->addr);
3955
3956 spin_lock_bh(&ifa->lock);
3957
3958 if (keep) {
3959 /* set state to skip the notifier below */
3960 state = INET6_IFADDR_STATE_DEAD;
3961 ifa->state = INET6_IFADDR_STATE_PREDAD;
3962 if (!(ifa->flags & IFA_F_NODAD))
3963 ifa->flags |= IFA_F_TENTATIVE;
3964
3965 rt = ifa->rt;
3966 ifa->rt = NULL;
3967 } else {
3968 state = ifa->state;
3969 ifa->state = INET6_IFADDR_STATE_DEAD;
3970 }
3971
3972 spin_unlock_bh(&ifa->lock);
3973
3974 if (rt)
3975 ip6_del_rt(net, rt, false);
3976
3977 if (state != INET6_IFADDR_STATE_DEAD) {
3978 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3979 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3980 } else {
3981 if (idev->cnf.forwarding)
3982 addrconf_leave_anycast(ifa);
3983 addrconf_leave_solict(ifa->idev, &ifa->addr);
3984 }
3985
3986 if (!keep) {
3987 write_lock_bh(&idev->lock);
3988 list_del_rcu(&ifa->if_list);
3989 write_unlock_bh(&idev->lock);
3990 in6_ifa_put(ifa);
3991 }
3992 }
3993
3994 /* Step 5: Discard anycast and multicast list */
3995 if (unregister) {
3996 ipv6_ac_destroy_dev(idev);
3997 ipv6_mc_destroy_dev(idev);
3998 } else if (was_ready) {
3999 ipv6_mc_down(idev);
4000 }
4001
4002 WRITE_ONCE(idev->tstamp, jiffies);
4003 idev->ra_mtu = 0;
4004
4005 /* Last: Shot the device (if unregistered) */
4006 if (unregister) {
4007 addrconf_sysctl_unregister(idev);
4008 neigh_parms_release(&nd_tbl, idev->nd_parms);
4009 neigh_ifdown(&nd_tbl, dev);
4010 in6_dev_put(idev);
4011 }
4012 return 0;
4013}
4014
4015static void addrconf_rs_timer(struct timer_list *t)
4016{
4017 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
4018 struct net_device *dev = idev->dev;
4019 struct in6_addr lladdr;
4020 int rtr_solicits;
4021
4022 write_lock(&idev->lock);
4023 if (idev->dead || !(idev->if_flags & IF_READY))
4024 goto out;
4025
4026 if (!ipv6_accept_ra(idev))
4027 goto out;
4028
4029 /* Announcement received after solicitation was sent */
4030 if (idev->if_flags & IF_RA_RCVD)
4031 goto out;
4032
4033 rtr_solicits = READ_ONCE(idev->cnf.rtr_solicits);
4034
4035 if (idev->rs_probes++ < rtr_solicits || rtr_solicits < 0) {
4036 write_unlock(&idev->lock);
4037 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4038 ndisc_send_rs(dev, &lladdr,
4039 &in6addr_linklocal_allrouters);
4040 else
4041 goto put;
4042
4043 write_lock(&idev->lock);
4044 idev->rs_interval = rfc3315_s14_backoff_update(
4045 idev->rs_interval,
4046 READ_ONCE(idev->cnf.rtr_solicit_max_interval));
4047 /* The wait after the last probe can be shorter */
4048 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
4049 READ_ONCE(idev->cnf.rtr_solicits)) ?
4050 READ_ONCE(idev->cnf.rtr_solicit_delay) :
4051 idev->rs_interval);
4052 } else {
4053 /*
4054 * Note: we do not support deprecated "all on-link"
4055 * assumption any longer.
4056 */
4057 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
4058 }
4059
4060out:
4061 write_unlock(&idev->lock);
4062put:
4063 in6_dev_put(idev);
4064}
4065
4066/*
4067 * Duplicate Address Detection
4068 */
4069static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
4070{
4071 struct inet6_dev *idev = ifp->idev;
4072 unsigned long rand_num;
4073 u64 nonce;
4074
4075 if (ifp->flags & IFA_F_OPTIMISTIC)
4076 rand_num = 0;
4077 else
4078 rand_num = get_random_u32_below(
4079 READ_ONCE(idev->cnf.rtr_solicit_delay) ? : 1);
4080
4081 nonce = 0;
4082 if (READ_ONCE(idev->cnf.enhanced_dad) ||
4083 READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad)) {
4084 do
4085 get_random_bytes(&nonce, 6);
4086 while (nonce == 0);
4087 }
4088 ifp->dad_nonce = nonce;
4089 ifp->dad_probes = READ_ONCE(idev->cnf.dad_transmits);
4090 addrconf_mod_dad_work(ifp, rand_num);
4091}
4092
4093static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
4094{
4095 struct inet6_dev *idev = ifp->idev;
4096 struct net_device *dev = idev->dev;
4097 bool bump_id, notify = false;
4098 struct net *net;
4099
4100 addrconf_join_solict(dev, &ifp->addr);
4101
4102 read_lock_bh(&idev->lock);
4103 spin_lock(&ifp->lock);
4104 if (ifp->state == INET6_IFADDR_STATE_DEAD)
4105 goto out;
4106
4107 net = dev_net(dev);
4108 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
4109 (READ_ONCE(net->ipv6.devconf_all->accept_dad) < 1 &&
4110 READ_ONCE(idev->cnf.accept_dad) < 1) ||
4111 !(ifp->flags&IFA_F_TENTATIVE) ||
4112 ifp->flags & IFA_F_NODAD) {
4113 bool send_na = false;
4114
4115 if (ifp->flags & IFA_F_TENTATIVE &&
4116 !(ifp->flags & IFA_F_OPTIMISTIC))
4117 send_na = true;
4118 bump_id = ifp->flags & IFA_F_TENTATIVE;
4119 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4120 spin_unlock(&ifp->lock);
4121 read_unlock_bh(&idev->lock);
4122
4123 addrconf_dad_completed(ifp, bump_id, send_na);
4124 return;
4125 }
4126
4127 if (!(idev->if_flags & IF_READY)) {
4128 spin_unlock(&ifp->lock);
4129 read_unlock_bh(&idev->lock);
4130 /*
4131 * If the device is not ready:
4132 * - keep it tentative if it is a permanent address.
4133 * - otherwise, kill it.
4134 */
4135 in6_ifa_hold(ifp);
4136 addrconf_dad_stop(ifp, 0);
4137 return;
4138 }
4139
4140 /*
4141 * Optimistic nodes can start receiving
4142 * Frames right away
4143 */
4144 if (ifp->flags & IFA_F_OPTIMISTIC) {
4145 ip6_ins_rt(net, ifp->rt);
4146 if (ipv6_use_optimistic_addr(net, idev)) {
4147 /* Because optimistic nodes can use this address,
4148 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4149 */
4150 notify = true;
4151 }
4152 }
4153
4154 addrconf_dad_kick(ifp);
4155out:
4156 spin_unlock(&ifp->lock);
4157 read_unlock_bh(&idev->lock);
4158 if (notify)
4159 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4160}
4161
4162static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4163{
4164 bool begin_dad = false;
4165
4166 spin_lock_bh(&ifp->lock);
4167 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4168 ifp->state = INET6_IFADDR_STATE_PREDAD;
4169 begin_dad = true;
4170 }
4171 spin_unlock_bh(&ifp->lock);
4172
4173 if (begin_dad)
4174 addrconf_mod_dad_work(ifp, 0);
4175}
4176
4177static void addrconf_dad_work(struct work_struct *w)
4178{
4179 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4180 struct inet6_ifaddr,
4181 dad_work);
4182 struct inet6_dev *idev = ifp->idev;
4183 bool bump_id, disable_ipv6 = false;
4184 struct in6_addr mcaddr;
4185
4186 enum {
4187 DAD_PROCESS,
4188 DAD_BEGIN,
4189 DAD_ABORT,
4190 } action = DAD_PROCESS;
4191
4192 rtnl_lock();
4193
4194 spin_lock_bh(&ifp->lock);
4195 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4196 action = DAD_BEGIN;
4197 ifp->state = INET6_IFADDR_STATE_DAD;
4198 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4199 action = DAD_ABORT;
4200 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4201
4202 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->accept_dad) > 1 ||
4203 READ_ONCE(idev->cnf.accept_dad) > 1) &&
4204 !idev->cnf.disable_ipv6 &&
4205 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4206 struct in6_addr addr;
4207
4208 addr.s6_addr32[0] = htonl(0xfe800000);
4209 addr.s6_addr32[1] = 0;
4210
4211 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4212 ipv6_addr_equal(&ifp->addr, &addr)) {
4213 /* DAD failed for link-local based on MAC */
4214 WRITE_ONCE(idev->cnf.disable_ipv6, 1);
4215
4216 pr_info("%s: IPv6 being disabled!\n",
4217 ifp->idev->dev->name);
4218 disable_ipv6 = true;
4219 }
4220 }
4221 }
4222 spin_unlock_bh(&ifp->lock);
4223
4224 if (action == DAD_BEGIN) {
4225 addrconf_dad_begin(ifp);
4226 goto out;
4227 } else if (action == DAD_ABORT) {
4228 in6_ifa_hold(ifp);
4229 addrconf_dad_stop(ifp, 1);
4230 if (disable_ipv6)
4231 addrconf_ifdown(idev->dev, false);
4232 goto out;
4233 }
4234
4235 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4236 goto out;
4237
4238 write_lock_bh(&idev->lock);
4239 if (idev->dead || !(idev->if_flags & IF_READY)) {
4240 write_unlock_bh(&idev->lock);
4241 goto out;
4242 }
4243
4244 spin_lock(&ifp->lock);
4245 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4246 spin_unlock(&ifp->lock);
4247 write_unlock_bh(&idev->lock);
4248 goto out;
4249 }
4250
4251 if (ifp->dad_probes == 0) {
4252 bool send_na = false;
4253
4254 /*
4255 * DAD was successful
4256 */
4257
4258 if (ifp->flags & IFA_F_TENTATIVE &&
4259 !(ifp->flags & IFA_F_OPTIMISTIC))
4260 send_na = true;
4261 bump_id = ifp->flags & IFA_F_TENTATIVE;
4262 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4263 spin_unlock(&ifp->lock);
4264 write_unlock_bh(&idev->lock);
4265
4266 addrconf_dad_completed(ifp, bump_id, send_na);
4267
4268 goto out;
4269 }
4270
4271 ifp->dad_probes--;
4272 addrconf_mod_dad_work(ifp,
4273 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4274 HZ/100));
4275 spin_unlock(&ifp->lock);
4276 write_unlock_bh(&idev->lock);
4277
4278 /* send a neighbour solicitation for our addr */
4279 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4280 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4281 ifp->dad_nonce);
4282out:
4283 in6_ifa_put(ifp);
4284 rtnl_unlock();
4285}
4286
4287/* ifp->idev must be at least read locked */
4288static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4289{
4290 struct inet6_ifaddr *ifpiter;
4291 struct inet6_dev *idev = ifp->idev;
4292
4293 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4294 if (ifpiter->scope > IFA_LINK)
4295 break;
4296 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4297 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4298 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4299 IFA_F_PERMANENT)
4300 return false;
4301 }
4302 return true;
4303}
4304
4305static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4306 bool send_na)
4307{
4308 struct net_device *dev = ifp->idev->dev;
4309 struct in6_addr lladdr;
4310 bool send_rs, send_mld;
4311
4312 addrconf_del_dad_work(ifp);
4313
4314 /*
4315 * Configure the address for reception. Now it is valid.
4316 */
4317
4318 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4319
4320 /* If added prefix is link local and we are prepared to process
4321 router advertisements, start sending router solicitations.
4322 */
4323
4324 read_lock_bh(&ifp->idev->lock);
4325 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4326 send_rs = send_mld &&
4327 ipv6_accept_ra(ifp->idev) &&
4328 READ_ONCE(ifp->idev->cnf.rtr_solicits) != 0 &&
4329 (dev->flags & IFF_LOOPBACK) == 0 &&
4330 (dev->type != ARPHRD_TUNNEL) &&
4331 !netif_is_team_port(dev);
4332 read_unlock_bh(&ifp->idev->lock);
4333
4334 /* While dad is in progress mld report's source address is in6_addrany.
4335 * Resend with proper ll now.
4336 */
4337 if (send_mld)
4338 ipv6_mc_dad_complete(ifp->idev);
4339
4340 /* send unsolicited NA if enabled */
4341 if (send_na &&
4342 (READ_ONCE(ifp->idev->cnf.ndisc_notify) ||
4343 READ_ONCE(dev_net(dev)->ipv6.devconf_all->ndisc_notify))) {
4344 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4345 /*router=*/ !!ifp->idev->cnf.forwarding,
4346 /*solicited=*/ false, /*override=*/ true,
4347 /*inc_opt=*/ true);
4348 }
4349
4350 if (send_rs) {
4351 /*
4352 * If a host as already performed a random delay
4353 * [...] as part of DAD [...] there is no need
4354 * to delay again before sending the first RS
4355 */
4356 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4357 return;
4358 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4359
4360 write_lock_bh(&ifp->idev->lock);
4361 spin_lock(&ifp->lock);
4362 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4363 READ_ONCE(ifp->idev->cnf.rtr_solicit_interval));
4364 ifp->idev->rs_probes = 1;
4365 ifp->idev->if_flags |= IF_RS_SENT;
4366 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4367 spin_unlock(&ifp->lock);
4368 write_unlock_bh(&ifp->idev->lock);
4369 }
4370
4371 if (bump_id)
4372 rt_genid_bump_ipv6(dev_net(dev));
4373
4374 /* Make sure that a new temporary address will be created
4375 * before this temporary address becomes deprecated.
4376 */
4377 if (ifp->flags & IFA_F_TEMPORARY)
4378 addrconf_verify_rtnl(dev_net(dev));
4379}
4380
4381static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4382{
4383 struct inet6_ifaddr *ifp;
4384
4385 read_lock_bh(&idev->lock);
4386 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4387 spin_lock(&ifp->lock);
4388 if ((ifp->flags & IFA_F_TENTATIVE &&
4389 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4390 if (restart)
4391 ifp->state = INET6_IFADDR_STATE_PREDAD;
4392 addrconf_dad_kick(ifp);
4393 }
4394 spin_unlock(&ifp->lock);
4395 }
4396 read_unlock_bh(&idev->lock);
4397}
4398
4399#ifdef CONFIG_PROC_FS
4400struct if6_iter_state {
4401 struct seq_net_private p;
4402 int bucket;
4403 int offset;
4404};
4405
4406static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4407{
4408 struct if6_iter_state *state = seq->private;
4409 struct net *net = seq_file_net(seq);
4410 struct inet6_ifaddr *ifa = NULL;
4411 int p = 0;
4412
4413 /* initial bucket if pos is 0 */
4414 if (pos == 0) {
4415 state->bucket = 0;
4416 state->offset = 0;
4417 }
4418
4419 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4420 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket],
4421 addr_lst) {
4422 /* sync with offset */
4423 if (p < state->offset) {
4424 p++;
4425 continue;
4426 }
4427 return ifa;
4428 }
4429
4430 /* prepare for next bucket */
4431 state->offset = 0;
4432 p = 0;
4433 }
4434 return NULL;
4435}
4436
4437static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4438 struct inet6_ifaddr *ifa)
4439{
4440 struct if6_iter_state *state = seq->private;
4441 struct net *net = seq_file_net(seq);
4442
4443 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4444 state->offset++;
4445 return ifa;
4446 }
4447
4448 state->offset = 0;
4449 while (++state->bucket < IN6_ADDR_HSIZE) {
4450 hlist_for_each_entry_rcu(ifa,
4451 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) {
4452 return ifa;
4453 }
4454 }
4455
4456 return NULL;
4457}
4458
4459static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4460 __acquires(rcu)
4461{
4462 rcu_read_lock();
4463 return if6_get_first(seq, *pos);
4464}
4465
4466static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4467{
4468 struct inet6_ifaddr *ifa;
4469
4470 ifa = if6_get_next(seq, v);
4471 ++*pos;
4472 return ifa;
4473}
4474
4475static void if6_seq_stop(struct seq_file *seq, void *v)
4476 __releases(rcu)
4477{
4478 rcu_read_unlock();
4479}
4480
4481static int if6_seq_show(struct seq_file *seq, void *v)
4482{
4483 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4484 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4485 &ifp->addr,
4486 ifp->idev->dev->ifindex,
4487 ifp->prefix_len,
4488 ifp->scope,
4489 (u8) ifp->flags,
4490 ifp->idev->dev->name);
4491 return 0;
4492}
4493
4494static const struct seq_operations if6_seq_ops = {
4495 .start = if6_seq_start,
4496 .next = if6_seq_next,
4497 .show = if6_seq_show,
4498 .stop = if6_seq_stop,
4499};
4500
4501static int __net_init if6_proc_net_init(struct net *net)
4502{
4503 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4504 sizeof(struct if6_iter_state)))
4505 return -ENOMEM;
4506 return 0;
4507}
4508
4509static void __net_exit if6_proc_net_exit(struct net *net)
4510{
4511 remove_proc_entry("if_inet6", net->proc_net);
4512}
4513
4514static struct pernet_operations if6_proc_net_ops = {
4515 .init = if6_proc_net_init,
4516 .exit = if6_proc_net_exit,
4517};
4518
4519int __init if6_proc_init(void)
4520{
4521 return register_pernet_subsys(&if6_proc_net_ops);
4522}
4523
4524void if6_proc_exit(void)
4525{
4526 unregister_pernet_subsys(&if6_proc_net_ops);
4527}
4528#endif /* CONFIG_PROC_FS */
4529
4530#if IS_ENABLED(CONFIG_IPV6_MIP6)
4531/* Check if address is a home address configured on any interface. */
4532int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4533{
4534 unsigned int hash = inet6_addr_hash(net, addr);
4535 struct inet6_ifaddr *ifp = NULL;
4536 int ret = 0;
4537
4538 rcu_read_lock();
4539 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4540 if (ipv6_addr_equal(&ifp->addr, addr) &&
4541 (ifp->flags & IFA_F_HOMEADDRESS)) {
4542 ret = 1;
4543 break;
4544 }
4545 }
4546 rcu_read_unlock();
4547 return ret;
4548}
4549#endif
4550
4551/* RFC6554 has some algorithm to avoid loops in segment routing by
4552 * checking if the segments contains any of a local interface address.
4553 *
4554 * Quote:
4555 *
4556 * To detect loops in the SRH, a router MUST determine if the SRH
4557 * includes multiple addresses assigned to any interface on that router.
4558 * If such addresses appear more than once and are separated by at least
4559 * one address not assigned to that router.
4560 */
4561int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4562 unsigned char nsegs)
4563{
4564 const struct in6_addr *addr;
4565 int i, ret = 0, found = 0;
4566 struct inet6_ifaddr *ifp;
4567 bool separated = false;
4568 unsigned int hash;
4569 bool hash_found;
4570
4571 rcu_read_lock();
4572 for (i = 0; i < nsegs; i++) {
4573 addr = &segs[i];
4574 hash = inet6_addr_hash(net, addr);
4575
4576 hash_found = false;
4577 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4578
4579 if (ipv6_addr_equal(&ifp->addr, addr)) {
4580 hash_found = true;
4581 break;
4582 }
4583 }
4584
4585 if (hash_found) {
4586 if (found > 1 && separated) {
4587 ret = 1;
4588 break;
4589 }
4590
4591 separated = false;
4592 found++;
4593 } else {
4594 separated = true;
4595 }
4596 }
4597 rcu_read_unlock();
4598
4599 return ret;
4600}
4601
4602/*
4603 * Periodic address status verification
4604 */
4605
4606static void addrconf_verify_rtnl(struct net *net)
4607{
4608 unsigned long now, next, next_sec, next_sched;
4609 struct inet6_ifaddr *ifp;
4610 int i;
4611
4612 ASSERT_RTNL();
4613
4614 rcu_read_lock_bh();
4615 now = jiffies;
4616 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4617
4618 cancel_delayed_work(&net->ipv6.addr_chk_work);
4619
4620 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4621restart:
4622 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) {
4623 unsigned long age;
4624
4625 /* When setting preferred_lft to a value not zero or
4626 * infinity, while valid_lft is infinity
4627 * IFA_F_PERMANENT has a non-infinity life time.
4628 */
4629 if ((ifp->flags & IFA_F_PERMANENT) &&
4630 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4631 continue;
4632
4633 spin_lock(&ifp->lock);
4634 /* We try to batch several events at once. */
4635 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4636
4637 if ((ifp->flags&IFA_F_TEMPORARY) &&
4638 !(ifp->flags&IFA_F_TENTATIVE) &&
4639 ifp->prefered_lft != INFINITY_LIFE_TIME &&
4640 !ifp->regen_count && ifp->ifpub) {
4641 /* This is a non-regenerated temporary addr. */
4642
4643 unsigned long regen_advance = ipv6_get_regen_advance(ifp->idev);
4644
4645 if (age + regen_advance >= ifp->prefered_lft) {
4646 struct inet6_ifaddr *ifpub = ifp->ifpub;
4647 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4648 next = ifp->tstamp + ifp->prefered_lft * HZ;
4649
4650 ifp->regen_count++;
4651 in6_ifa_hold(ifp);
4652 in6_ifa_hold(ifpub);
4653 spin_unlock(&ifp->lock);
4654
4655 spin_lock(&ifpub->lock);
4656 ifpub->regen_count = 0;
4657 spin_unlock(&ifpub->lock);
4658 rcu_read_unlock_bh();
4659 ipv6_create_tempaddr(ifpub, true);
4660 in6_ifa_put(ifpub);
4661 in6_ifa_put(ifp);
4662 rcu_read_lock_bh();
4663 goto restart;
4664 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4665 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4666 }
4667
4668 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4669 age >= ifp->valid_lft) {
4670 spin_unlock(&ifp->lock);
4671 in6_ifa_hold(ifp);
4672 rcu_read_unlock_bh();
4673 ipv6_del_addr(ifp);
4674 rcu_read_lock_bh();
4675 goto restart;
4676 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4677 spin_unlock(&ifp->lock);
4678 continue;
4679 } else if (age >= ifp->prefered_lft) {
4680 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4681 int deprecate = 0;
4682
4683 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4684 deprecate = 1;
4685 ifp->flags |= IFA_F_DEPRECATED;
4686 }
4687
4688 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4689 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4690 next = ifp->tstamp + ifp->valid_lft * HZ;
4691
4692 spin_unlock(&ifp->lock);
4693
4694 if (deprecate) {
4695 in6_ifa_hold(ifp);
4696
4697 ipv6_ifa_notify(0, ifp);
4698 in6_ifa_put(ifp);
4699 goto restart;
4700 }
4701 } else {
4702 /* ifp->prefered_lft <= ifp->valid_lft */
4703 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4704 next = ifp->tstamp + ifp->prefered_lft * HZ;
4705 spin_unlock(&ifp->lock);
4706 }
4707 }
4708 }
4709
4710 next_sec = round_jiffies_up(next);
4711 next_sched = next;
4712
4713 /* If rounded timeout is accurate enough, accept it. */
4714 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4715 next_sched = next_sec;
4716
4717 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4718 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4719 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4720
4721 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4722 now, next, next_sec, next_sched);
4723 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now);
4724 rcu_read_unlock_bh();
4725}
4726
4727static void addrconf_verify_work(struct work_struct *w)
4728{
4729 struct net *net = container_of(to_delayed_work(w), struct net,
4730 ipv6.addr_chk_work);
4731
4732 rtnl_lock();
4733 addrconf_verify_rtnl(net);
4734 rtnl_unlock();
4735}
4736
4737static void addrconf_verify(struct net *net)
4738{
4739 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0);
4740}
4741
4742static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4743 struct in6_addr **peer_pfx)
4744{
4745 struct in6_addr *pfx = NULL;
4746
4747 *peer_pfx = NULL;
4748
4749 if (addr)
4750 pfx = nla_data(addr);
4751
4752 if (local) {
4753 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4754 *peer_pfx = pfx;
4755 pfx = nla_data(local);
4756 }
4757
4758 return pfx;
4759}
4760
4761static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4762 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4763 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4764 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4765 [IFA_FLAGS] = { .len = sizeof(u32) },
4766 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4767 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4768 [IFA_PROTO] = { .type = NLA_U8 },
4769};
4770
4771static int
4772inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4773 struct netlink_ext_ack *extack)
4774{
4775 struct net *net = sock_net(skb->sk);
4776 struct ifaddrmsg *ifm;
4777 struct nlattr *tb[IFA_MAX+1];
4778 struct in6_addr *pfx, *peer_pfx;
4779 u32 ifa_flags;
4780 int err;
4781
4782 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4783 ifa_ipv6_policy, extack);
4784 if (err < 0)
4785 return err;
4786
4787 ifm = nlmsg_data(nlh);
4788 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4789 if (!pfx)
4790 return -EINVAL;
4791
4792 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4793
4794 /* We ignore other flags so far. */
4795 ifa_flags &= IFA_F_MANAGETEMPADDR;
4796
4797 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4798 ifm->ifa_prefixlen, extack);
4799}
4800
4801static int modify_prefix_route(struct inet6_ifaddr *ifp,
4802 unsigned long expires, u32 flags,
4803 bool modify_peer)
4804{
4805 struct fib6_table *table;
4806 struct fib6_info *f6i;
4807 u32 prio;
4808
4809 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4810 ifp->prefix_len,
4811 ifp->idev->dev, 0, RTF_DEFAULT, true);
4812 if (!f6i)
4813 return -ENOENT;
4814
4815 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4816 if (f6i->fib6_metric != prio) {
4817 /* delete old one */
4818 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4819
4820 /* add new one */
4821 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4822 ifp->prefix_len,
4823 ifp->rt_priority, ifp->idev->dev,
4824 expires, flags, GFP_KERNEL);
4825 } else {
4826 table = f6i->fib6_table;
4827 spin_lock_bh(&table->tb6_lock);
4828
4829 if (!(flags & RTF_EXPIRES)) {
4830 fib6_clean_expires(f6i);
4831 fib6_remove_gc_list(f6i);
4832 } else {
4833 fib6_set_expires(f6i, expires);
4834 fib6_add_gc_list(f6i);
4835 }
4836
4837 spin_unlock_bh(&table->tb6_lock);
4838
4839 fib6_info_release(f6i);
4840 }
4841
4842 return 0;
4843}
4844
4845static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp,
4846 struct ifa6_config *cfg)
4847{
4848 u32 flags;
4849 clock_t expires;
4850 unsigned long timeout;
4851 bool was_managetempaddr;
4852 bool had_prefixroute;
4853 bool new_peer = false;
4854
4855 ASSERT_RTNL();
4856
4857 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4858 return -EINVAL;
4859
4860 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4861 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4862 return -EINVAL;
4863
4864 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4865 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4866
4867 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4868 if (addrconf_finite_timeout(timeout)) {
4869 expires = jiffies_to_clock_t(timeout * HZ);
4870 cfg->valid_lft = timeout;
4871 flags = RTF_EXPIRES;
4872 } else {
4873 expires = 0;
4874 flags = 0;
4875 cfg->ifa_flags |= IFA_F_PERMANENT;
4876 }
4877
4878 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4879 if (addrconf_finite_timeout(timeout)) {
4880 if (timeout == 0)
4881 cfg->ifa_flags |= IFA_F_DEPRECATED;
4882 cfg->preferred_lft = timeout;
4883 }
4884
4885 if (cfg->peer_pfx &&
4886 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4887 if (!ipv6_addr_any(&ifp->peer_addr))
4888 cleanup_prefix_route(ifp, expires, true, true);
4889 new_peer = true;
4890 }
4891
4892 spin_lock_bh(&ifp->lock);
4893 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4894 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4895 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4896 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4897 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4898 IFA_F_NOPREFIXROUTE);
4899 ifp->flags |= cfg->ifa_flags;
4900 WRITE_ONCE(ifp->tstamp, jiffies);
4901 WRITE_ONCE(ifp->valid_lft, cfg->valid_lft);
4902 WRITE_ONCE(ifp->prefered_lft, cfg->preferred_lft);
4903 WRITE_ONCE(ifp->ifa_proto, cfg->ifa_proto);
4904
4905 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4906 WRITE_ONCE(ifp->rt_priority, cfg->rt_priority);
4907
4908 if (new_peer)
4909 ifp->peer_addr = *cfg->peer_pfx;
4910
4911 spin_unlock_bh(&ifp->lock);
4912 if (!(ifp->flags&IFA_F_TENTATIVE))
4913 ipv6_ifa_notify(0, ifp);
4914
4915 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4916 int rc = -ENOENT;
4917
4918 if (had_prefixroute)
4919 rc = modify_prefix_route(ifp, expires, flags, false);
4920
4921 /* prefix route could have been deleted; if so restore it */
4922 if (rc == -ENOENT) {
4923 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4924 ifp->rt_priority, ifp->idev->dev,
4925 expires, flags, GFP_KERNEL);
4926 }
4927
4928 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4929 rc = modify_prefix_route(ifp, expires, flags, true);
4930
4931 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4932 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4933 ifp->rt_priority, ifp->idev->dev,
4934 expires, flags, GFP_KERNEL);
4935 }
4936 } else if (had_prefixroute) {
4937 enum cleanup_prefix_rt_t action;
4938 unsigned long rt_expires;
4939
4940 write_lock_bh(&ifp->idev->lock);
4941 action = check_cleanup_prefix_route(ifp, &rt_expires);
4942 write_unlock_bh(&ifp->idev->lock);
4943
4944 if (action != CLEANUP_PREFIX_RT_NOP) {
4945 cleanup_prefix_route(ifp, rt_expires,
4946 action == CLEANUP_PREFIX_RT_DEL, false);
4947 }
4948 }
4949
4950 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4951 if (was_managetempaddr &&
4952 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4953 cfg->valid_lft = 0;
4954 cfg->preferred_lft = 0;
4955 }
4956 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4957 cfg->preferred_lft, !was_managetempaddr,
4958 jiffies);
4959 }
4960
4961 addrconf_verify_rtnl(net);
4962
4963 return 0;
4964}
4965
4966static int
4967inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4968 struct netlink_ext_ack *extack)
4969{
4970 struct net *net = sock_net(skb->sk);
4971 struct ifaddrmsg *ifm;
4972 struct nlattr *tb[IFA_MAX+1];
4973 struct in6_addr *peer_pfx;
4974 struct inet6_ifaddr *ifa;
4975 struct net_device *dev;
4976 struct inet6_dev *idev;
4977 struct ifa6_config cfg;
4978 int err;
4979
4980 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4981 ifa_ipv6_policy, extack);
4982 if (err < 0)
4983 return err;
4984
4985 memset(&cfg, 0, sizeof(cfg));
4986
4987 ifm = nlmsg_data(nlh);
4988 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4989 if (!cfg.pfx)
4990 return -EINVAL;
4991
4992 cfg.peer_pfx = peer_pfx;
4993 cfg.plen = ifm->ifa_prefixlen;
4994 if (tb[IFA_RT_PRIORITY])
4995 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4996
4997 if (tb[IFA_PROTO])
4998 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]);
4999
5000 cfg.valid_lft = INFINITY_LIFE_TIME;
5001 cfg.preferred_lft = INFINITY_LIFE_TIME;
5002
5003 if (tb[IFA_CACHEINFO]) {
5004 struct ifa_cacheinfo *ci;
5005
5006 ci = nla_data(tb[IFA_CACHEINFO]);
5007 cfg.valid_lft = ci->ifa_valid;
5008 cfg.preferred_lft = ci->ifa_prefered;
5009 }
5010
5011 dev = __dev_get_by_index(net, ifm->ifa_index);
5012 if (!dev) {
5013 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
5014 return -ENODEV;
5015 }
5016
5017 if (tb[IFA_FLAGS])
5018 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
5019 else
5020 cfg.ifa_flags = ifm->ifa_flags;
5021
5022 /* We ignore other flags so far. */
5023 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
5024 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
5025 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
5026
5027 idev = ipv6_find_idev(dev);
5028 if (IS_ERR(idev))
5029 return PTR_ERR(idev);
5030
5031 if (!ipv6_allow_optimistic_dad(net, idev))
5032 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
5033
5034 if (cfg.ifa_flags & IFA_F_NODAD &&
5035 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
5036 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
5037 return -EINVAL;
5038 }
5039
5040 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
5041 if (!ifa) {
5042 /*
5043 * It would be best to check for !NLM_F_CREATE here but
5044 * userspace already relies on not having to provide this.
5045 */
5046 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
5047 }
5048
5049 if (nlh->nlmsg_flags & NLM_F_EXCL ||
5050 !(nlh->nlmsg_flags & NLM_F_REPLACE)) {
5051 NL_SET_ERR_MSG_MOD(extack, "address already assigned");
5052 err = -EEXIST;
5053 } else {
5054 err = inet6_addr_modify(net, ifa, &cfg);
5055 }
5056
5057 in6_ifa_put(ifa);
5058
5059 return err;
5060}
5061
5062static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
5063 u8 scope, int ifindex)
5064{
5065 struct ifaddrmsg *ifm;
5066
5067 ifm = nlmsg_data(nlh);
5068 ifm->ifa_family = AF_INET6;
5069 ifm->ifa_prefixlen = prefixlen;
5070 ifm->ifa_flags = flags;
5071 ifm->ifa_scope = scope;
5072 ifm->ifa_index = ifindex;
5073}
5074
5075static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
5076 unsigned long tstamp, u32 preferred, u32 valid)
5077{
5078 struct ifa_cacheinfo ci;
5079
5080 ci.cstamp = cstamp_delta(cstamp);
5081 ci.tstamp = cstamp_delta(tstamp);
5082 ci.ifa_prefered = preferred;
5083 ci.ifa_valid = valid;
5084
5085 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
5086}
5087
5088static inline int rt_scope(int ifa_scope)
5089{
5090 if (ifa_scope & IFA_HOST)
5091 return RT_SCOPE_HOST;
5092 else if (ifa_scope & IFA_LINK)
5093 return RT_SCOPE_LINK;
5094 else if (ifa_scope & IFA_SITE)
5095 return RT_SCOPE_SITE;
5096 else
5097 return RT_SCOPE_UNIVERSE;
5098}
5099
5100static inline int inet6_ifaddr_msgsize(void)
5101{
5102 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
5103 + nla_total_size(16) /* IFA_LOCAL */
5104 + nla_total_size(16) /* IFA_ADDRESS */
5105 + nla_total_size(sizeof(struct ifa_cacheinfo))
5106 + nla_total_size(4) /* IFA_FLAGS */
5107 + nla_total_size(1) /* IFA_PROTO */
5108 + nla_total_size(4) /* IFA_RT_PRIORITY */;
5109}
5110
5111enum addr_type_t {
5112 UNICAST_ADDR,
5113 MULTICAST_ADDR,
5114 ANYCAST_ADDR,
5115};
5116
5117struct inet6_fill_args {
5118 u32 portid;
5119 u32 seq;
5120 int event;
5121 unsigned int flags;
5122 int netnsid;
5123 int ifindex;
5124 enum addr_type_t type;
5125};
5126
5127static int inet6_fill_ifaddr(struct sk_buff *skb,
5128 const struct inet6_ifaddr *ifa,
5129 struct inet6_fill_args *args)
5130{
5131 struct nlmsghdr *nlh;
5132 u32 preferred, valid;
5133 u32 flags, priority;
5134 u8 proto;
5135
5136 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5137 sizeof(struct ifaddrmsg), args->flags);
5138 if (!nlh)
5139 return -EMSGSIZE;
5140
5141 flags = READ_ONCE(ifa->flags);
5142 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
5143 ifa->idev->dev->ifindex);
5144
5145 if (args->netnsid >= 0 &&
5146 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5147 goto error;
5148
5149 preferred = READ_ONCE(ifa->prefered_lft);
5150 valid = READ_ONCE(ifa->valid_lft);
5151
5152 if (!((flags & IFA_F_PERMANENT) &&
5153 (preferred == INFINITY_LIFE_TIME))) {
5154 if (preferred != INFINITY_LIFE_TIME) {
5155 long tval = (jiffies - READ_ONCE(ifa->tstamp)) / HZ;
5156
5157 if (preferred > tval)
5158 preferred -= tval;
5159 else
5160 preferred = 0;
5161 if (valid != INFINITY_LIFE_TIME) {
5162 if (valid > tval)
5163 valid -= tval;
5164 else
5165 valid = 0;
5166 }
5167 }
5168 } else {
5169 preferred = INFINITY_LIFE_TIME;
5170 valid = INFINITY_LIFE_TIME;
5171 }
5172
5173 if (!ipv6_addr_any(&ifa->peer_addr)) {
5174 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5175 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5176 goto error;
5177 } else {
5178 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5179 goto error;
5180 }
5181
5182 priority = READ_ONCE(ifa->rt_priority);
5183 if (priority && nla_put_u32(skb, IFA_RT_PRIORITY, priority))
5184 goto error;
5185
5186 if (put_cacheinfo(skb, ifa->cstamp, READ_ONCE(ifa->tstamp),
5187 preferred, valid) < 0)
5188 goto error;
5189
5190 if (nla_put_u32(skb, IFA_FLAGS, flags) < 0)
5191 goto error;
5192
5193 proto = READ_ONCE(ifa->ifa_proto);
5194 if (proto && nla_put_u8(skb, IFA_PROTO, proto))
5195 goto error;
5196
5197 nlmsg_end(skb, nlh);
5198 return 0;
5199
5200error:
5201 nlmsg_cancel(skb, nlh);
5202 return -EMSGSIZE;
5203}
5204
5205static int inet6_fill_ifmcaddr(struct sk_buff *skb,
5206 const struct ifmcaddr6 *ifmca,
5207 struct inet6_fill_args *args)
5208{
5209 int ifindex = ifmca->idev->dev->ifindex;
5210 u8 scope = RT_SCOPE_UNIVERSE;
5211 struct nlmsghdr *nlh;
5212
5213 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5214 scope = RT_SCOPE_SITE;
5215
5216 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5217 sizeof(struct ifaddrmsg), args->flags);
5218 if (!nlh)
5219 return -EMSGSIZE;
5220
5221 if (args->netnsid >= 0 &&
5222 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5223 nlmsg_cancel(skb, nlh);
5224 return -EMSGSIZE;
5225 }
5226
5227 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5228 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5229 put_cacheinfo(skb, ifmca->mca_cstamp, READ_ONCE(ifmca->mca_tstamp),
5230 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5231 nlmsg_cancel(skb, nlh);
5232 return -EMSGSIZE;
5233 }
5234
5235 nlmsg_end(skb, nlh);
5236 return 0;
5237}
5238
5239static int inet6_fill_ifacaddr(struct sk_buff *skb,
5240 const struct ifacaddr6 *ifaca,
5241 struct inet6_fill_args *args)
5242{
5243 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5244 int ifindex = dev ? dev->ifindex : 1;
5245 u8 scope = RT_SCOPE_UNIVERSE;
5246 struct nlmsghdr *nlh;
5247
5248 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5249 scope = RT_SCOPE_SITE;
5250
5251 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5252 sizeof(struct ifaddrmsg), args->flags);
5253 if (!nlh)
5254 return -EMSGSIZE;
5255
5256 if (args->netnsid >= 0 &&
5257 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5258 nlmsg_cancel(skb, nlh);
5259 return -EMSGSIZE;
5260 }
5261
5262 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5263 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5264 put_cacheinfo(skb, ifaca->aca_cstamp, READ_ONCE(ifaca->aca_tstamp),
5265 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5266 nlmsg_cancel(skb, nlh);
5267 return -EMSGSIZE;
5268 }
5269
5270 nlmsg_end(skb, nlh);
5271 return 0;
5272}
5273
5274/* called with rcu_read_lock() */
5275static int in6_dump_addrs(const struct inet6_dev *idev, struct sk_buff *skb,
5276 struct netlink_callback *cb, int *s_ip_idx,
5277 struct inet6_fill_args *fillargs)
5278{
5279 const struct ifmcaddr6 *ifmca;
5280 const struct ifacaddr6 *ifaca;
5281 int ip_idx = 0;
5282 int err = 0;
5283
5284 switch (fillargs->type) {
5285 case UNICAST_ADDR: {
5286 const struct inet6_ifaddr *ifa;
5287 fillargs->event = RTM_NEWADDR;
5288
5289 /* unicast address incl. temp addr */
5290 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
5291 if (ip_idx < *s_ip_idx)
5292 goto next;
5293 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5294 if (err < 0)
5295 break;
5296 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5297next:
5298 ip_idx++;
5299 }
5300 break;
5301 }
5302 case MULTICAST_ADDR:
5303 fillargs->event = RTM_GETMULTICAST;
5304
5305 /* multicast address */
5306 for (ifmca = rcu_dereference(idev->mc_list);
5307 ifmca;
5308 ifmca = rcu_dereference(ifmca->next), ip_idx++) {
5309 if (ip_idx < *s_ip_idx)
5310 continue;
5311 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5312 if (err < 0)
5313 break;
5314 }
5315 break;
5316 case ANYCAST_ADDR:
5317 fillargs->event = RTM_GETANYCAST;
5318 /* anycast address */
5319 for (ifaca = rcu_dereference(idev->ac_list); ifaca;
5320 ifaca = rcu_dereference(ifaca->aca_next), ip_idx++) {
5321 if (ip_idx < *s_ip_idx)
5322 continue;
5323 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5324 if (err < 0)
5325 break;
5326 }
5327 break;
5328 default:
5329 break;
5330 }
5331 *s_ip_idx = err ? ip_idx : 0;
5332 return err;
5333}
5334
5335static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5336 struct inet6_fill_args *fillargs,
5337 struct net **tgt_net, struct sock *sk,
5338 struct netlink_callback *cb)
5339{
5340 struct netlink_ext_ack *extack = cb->extack;
5341 struct nlattr *tb[IFA_MAX+1];
5342 struct ifaddrmsg *ifm;
5343 int err, i;
5344
5345 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5346 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5347 return -EINVAL;
5348 }
5349
5350 ifm = nlmsg_data(nlh);
5351 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5352 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5353 return -EINVAL;
5354 }
5355
5356 fillargs->ifindex = ifm->ifa_index;
5357 if (fillargs->ifindex) {
5358 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5359 fillargs->flags |= NLM_F_DUMP_FILTERED;
5360 }
5361
5362 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5363 ifa_ipv6_policy, extack);
5364 if (err < 0)
5365 return err;
5366
5367 for (i = 0; i <= IFA_MAX; ++i) {
5368 if (!tb[i])
5369 continue;
5370
5371 if (i == IFA_TARGET_NETNSID) {
5372 struct net *net;
5373
5374 fillargs->netnsid = nla_get_s32(tb[i]);
5375 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5376 if (IS_ERR(net)) {
5377 fillargs->netnsid = -1;
5378 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5379 return PTR_ERR(net);
5380 }
5381 *tgt_net = net;
5382 } else {
5383 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5384 return -EINVAL;
5385 }
5386 }
5387
5388 return 0;
5389}
5390
5391static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5392 enum addr_type_t type)
5393{
5394 struct net *tgt_net = sock_net(skb->sk);
5395 const struct nlmsghdr *nlh = cb->nlh;
5396 struct inet6_fill_args fillargs = {
5397 .portid = NETLINK_CB(cb->skb).portid,
5398 .seq = cb->nlh->nlmsg_seq,
5399 .flags = NLM_F_MULTI,
5400 .netnsid = -1,
5401 .type = type,
5402 };
5403 struct {
5404 unsigned long ifindex;
5405 int ip_idx;
5406 } *ctx = (void *)cb->ctx;
5407 struct net_device *dev;
5408 struct inet6_dev *idev;
5409 int err = 0;
5410
5411 rcu_read_lock();
5412 if (cb->strict_check) {
5413 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5414 skb->sk, cb);
5415 if (err < 0)
5416 goto done;
5417
5418 err = 0;
5419 if (fillargs.ifindex) {
5420 dev = dev_get_by_index_rcu(tgt_net, fillargs.ifindex);
5421 if (!dev) {
5422 err = -ENODEV;
5423 goto done;
5424 }
5425 idev = __in6_dev_get(dev);
5426 if (idev)
5427 err = in6_dump_addrs(idev, skb, cb,
5428 &ctx->ip_idx,
5429 &fillargs);
5430 goto done;
5431 }
5432 }
5433
5434 cb->seq = inet6_base_seq(tgt_net);
5435 for_each_netdev_dump(tgt_net, dev, ctx->ifindex) {
5436 idev = __in6_dev_get(dev);
5437 if (!idev)
5438 continue;
5439 err = in6_dump_addrs(idev, skb, cb, &ctx->ip_idx,
5440 &fillargs);
5441 if (err < 0)
5442 goto done;
5443 }
5444done:
5445 rcu_read_unlock();
5446 if (fillargs.netnsid >= 0)
5447 put_net(tgt_net);
5448
5449 return err;
5450}
5451
5452static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5453{
5454 enum addr_type_t type = UNICAST_ADDR;
5455
5456 return inet6_dump_addr(skb, cb, type);
5457}
5458
5459static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5460{
5461 enum addr_type_t type = MULTICAST_ADDR;
5462
5463 return inet6_dump_addr(skb, cb, type);
5464}
5465
5466
5467static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5468{
5469 enum addr_type_t type = ANYCAST_ADDR;
5470
5471 return inet6_dump_addr(skb, cb, type);
5472}
5473
5474static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5475 const struct nlmsghdr *nlh,
5476 struct nlattr **tb,
5477 struct netlink_ext_ack *extack)
5478{
5479 struct ifaddrmsg *ifm;
5480 int i, err;
5481
5482 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5483 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5484 return -EINVAL;
5485 }
5486
5487 if (!netlink_strict_get_check(skb))
5488 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5489 ifa_ipv6_policy, extack);
5490
5491 ifm = nlmsg_data(nlh);
5492 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5493 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5494 return -EINVAL;
5495 }
5496
5497 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5498 ifa_ipv6_policy, extack);
5499 if (err)
5500 return err;
5501
5502 for (i = 0; i <= IFA_MAX; i++) {
5503 if (!tb[i])
5504 continue;
5505
5506 switch (i) {
5507 case IFA_TARGET_NETNSID:
5508 case IFA_ADDRESS:
5509 case IFA_LOCAL:
5510 break;
5511 default:
5512 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5513 return -EINVAL;
5514 }
5515 }
5516
5517 return 0;
5518}
5519
5520static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5521 struct netlink_ext_ack *extack)
5522{
5523 struct net *tgt_net = sock_net(in_skb->sk);
5524 struct inet6_fill_args fillargs = {
5525 .portid = NETLINK_CB(in_skb).portid,
5526 .seq = nlh->nlmsg_seq,
5527 .event = RTM_NEWADDR,
5528 .flags = 0,
5529 .netnsid = -1,
5530 };
5531 struct ifaddrmsg *ifm;
5532 struct nlattr *tb[IFA_MAX+1];
5533 struct in6_addr *addr = NULL, *peer;
5534 struct net_device *dev = NULL;
5535 struct inet6_ifaddr *ifa;
5536 struct sk_buff *skb;
5537 int err;
5538
5539 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5540 if (err < 0)
5541 return err;
5542
5543 if (tb[IFA_TARGET_NETNSID]) {
5544 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5545
5546 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5547 fillargs.netnsid);
5548 if (IS_ERR(tgt_net))
5549 return PTR_ERR(tgt_net);
5550 }
5551
5552 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5553 if (!addr) {
5554 err = -EINVAL;
5555 goto errout;
5556 }
5557 ifm = nlmsg_data(nlh);
5558 if (ifm->ifa_index)
5559 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5560
5561 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5562 if (!ifa) {
5563 err = -EADDRNOTAVAIL;
5564 goto errout;
5565 }
5566
5567 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5568 if (!skb) {
5569 err = -ENOBUFS;
5570 goto errout_ifa;
5571 }
5572
5573 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5574 if (err < 0) {
5575 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5576 WARN_ON(err == -EMSGSIZE);
5577 kfree_skb(skb);
5578 goto errout_ifa;
5579 }
5580 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5581errout_ifa:
5582 in6_ifa_put(ifa);
5583errout:
5584 dev_put(dev);
5585 if (fillargs.netnsid >= 0)
5586 put_net(tgt_net);
5587
5588 return err;
5589}
5590
5591static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5592{
5593 struct sk_buff *skb;
5594 struct net *net = dev_net(ifa->idev->dev);
5595 struct inet6_fill_args fillargs = {
5596 .portid = 0,
5597 .seq = 0,
5598 .event = event,
5599 .flags = 0,
5600 .netnsid = -1,
5601 };
5602 int err = -ENOBUFS;
5603
5604 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5605 if (!skb)
5606 goto errout;
5607
5608 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5609 if (err < 0) {
5610 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5611 WARN_ON(err == -EMSGSIZE);
5612 kfree_skb(skb);
5613 goto errout;
5614 }
5615 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5616 return;
5617errout:
5618 if (err < 0)
5619 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5620}
5621
5622static void ipv6_store_devconf(const struct ipv6_devconf *cnf,
5623 __s32 *array, int bytes)
5624{
5625 BUG_ON(bytes < (DEVCONF_MAX * 4));
5626
5627 memset(array, 0, bytes);
5628 array[DEVCONF_FORWARDING] = READ_ONCE(cnf->forwarding);
5629 array[DEVCONF_HOPLIMIT] = READ_ONCE(cnf->hop_limit);
5630 array[DEVCONF_MTU6] = READ_ONCE(cnf->mtu6);
5631 array[DEVCONF_ACCEPT_RA] = READ_ONCE(cnf->accept_ra);
5632 array[DEVCONF_ACCEPT_REDIRECTS] = READ_ONCE(cnf->accept_redirects);
5633 array[DEVCONF_AUTOCONF] = READ_ONCE(cnf->autoconf);
5634 array[DEVCONF_DAD_TRANSMITS] = READ_ONCE(cnf->dad_transmits);
5635 array[DEVCONF_RTR_SOLICITS] = READ_ONCE(cnf->rtr_solicits);
5636 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5637 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_interval));
5638 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5639 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_max_interval));
5640 array[DEVCONF_RTR_SOLICIT_DELAY] =
5641 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_delay));
5642 array[DEVCONF_FORCE_MLD_VERSION] = READ_ONCE(cnf->force_mld_version);
5643 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5644 jiffies_to_msecs(READ_ONCE(cnf->mldv1_unsolicited_report_interval));
5645 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5646 jiffies_to_msecs(READ_ONCE(cnf->mldv2_unsolicited_report_interval));
5647 array[DEVCONF_USE_TEMPADDR] = READ_ONCE(cnf->use_tempaddr);
5648 array[DEVCONF_TEMP_VALID_LFT] = READ_ONCE(cnf->temp_valid_lft);
5649 array[DEVCONF_TEMP_PREFERED_LFT] = READ_ONCE(cnf->temp_prefered_lft);
5650 array[DEVCONF_REGEN_MAX_RETRY] = READ_ONCE(cnf->regen_max_retry);
5651 array[DEVCONF_MAX_DESYNC_FACTOR] = READ_ONCE(cnf->max_desync_factor);
5652 array[DEVCONF_MAX_ADDRESSES] = READ_ONCE(cnf->max_addresses);
5653 array[DEVCONF_ACCEPT_RA_DEFRTR] = READ_ONCE(cnf->accept_ra_defrtr);
5654 array[DEVCONF_RA_DEFRTR_METRIC] = READ_ONCE(cnf->ra_defrtr_metric);
5655 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] =
5656 READ_ONCE(cnf->accept_ra_min_hop_limit);
5657 array[DEVCONF_ACCEPT_RA_PINFO] = READ_ONCE(cnf->accept_ra_pinfo);
5658#ifdef CONFIG_IPV6_ROUTER_PREF
5659 array[DEVCONF_ACCEPT_RA_RTR_PREF] = READ_ONCE(cnf->accept_ra_rtr_pref);
5660 array[DEVCONF_RTR_PROBE_INTERVAL] =
5661 jiffies_to_msecs(READ_ONCE(cnf->rtr_probe_interval));
5662#ifdef CONFIG_IPV6_ROUTE_INFO
5663 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] =
5664 READ_ONCE(cnf->accept_ra_rt_info_min_plen);
5665 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] =
5666 READ_ONCE(cnf->accept_ra_rt_info_max_plen);
5667#endif
5668#endif
5669 array[DEVCONF_PROXY_NDP] = READ_ONCE(cnf->proxy_ndp);
5670 array[DEVCONF_ACCEPT_SOURCE_ROUTE] =
5671 READ_ONCE(cnf->accept_source_route);
5672#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5673 array[DEVCONF_OPTIMISTIC_DAD] = READ_ONCE(cnf->optimistic_dad);
5674 array[DEVCONF_USE_OPTIMISTIC] = READ_ONCE(cnf->use_optimistic);
5675#endif
5676#ifdef CONFIG_IPV6_MROUTE
5677 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5678#endif
5679 array[DEVCONF_DISABLE_IPV6] = READ_ONCE(cnf->disable_ipv6);
5680 array[DEVCONF_ACCEPT_DAD] = READ_ONCE(cnf->accept_dad);
5681 array[DEVCONF_FORCE_TLLAO] = READ_ONCE(cnf->force_tllao);
5682 array[DEVCONF_NDISC_NOTIFY] = READ_ONCE(cnf->ndisc_notify);
5683 array[DEVCONF_SUPPRESS_FRAG_NDISC] =
5684 READ_ONCE(cnf->suppress_frag_ndisc);
5685 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] =
5686 READ_ONCE(cnf->accept_ra_from_local);
5687 array[DEVCONF_ACCEPT_RA_MTU] = READ_ONCE(cnf->accept_ra_mtu);
5688 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] =
5689 READ_ONCE(cnf->ignore_routes_with_linkdown);
5690 /* we omit DEVCONF_STABLE_SECRET for now */
5691 array[DEVCONF_USE_OIF_ADDRS_ONLY] = READ_ONCE(cnf->use_oif_addrs_only);
5692 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] =
5693 READ_ONCE(cnf->drop_unicast_in_l2_multicast);
5694 array[DEVCONF_DROP_UNSOLICITED_NA] = READ_ONCE(cnf->drop_unsolicited_na);
5695 array[DEVCONF_KEEP_ADDR_ON_DOWN] = READ_ONCE(cnf->keep_addr_on_down);
5696 array[DEVCONF_SEG6_ENABLED] = READ_ONCE(cnf->seg6_enabled);
5697#ifdef CONFIG_IPV6_SEG6_HMAC
5698 array[DEVCONF_SEG6_REQUIRE_HMAC] = READ_ONCE(cnf->seg6_require_hmac);
5699#endif
5700 array[DEVCONF_ENHANCED_DAD] = READ_ONCE(cnf->enhanced_dad);
5701 array[DEVCONF_ADDR_GEN_MODE] = READ_ONCE(cnf->addr_gen_mode);
5702 array[DEVCONF_DISABLE_POLICY] = READ_ONCE(cnf->disable_policy);
5703 array[DEVCONF_NDISC_TCLASS] = READ_ONCE(cnf->ndisc_tclass);
5704 array[DEVCONF_RPL_SEG_ENABLED] = READ_ONCE(cnf->rpl_seg_enabled);
5705 array[DEVCONF_IOAM6_ENABLED] = READ_ONCE(cnf->ioam6_enabled);
5706 array[DEVCONF_IOAM6_ID] = READ_ONCE(cnf->ioam6_id);
5707 array[DEVCONF_IOAM6_ID_WIDE] = READ_ONCE(cnf->ioam6_id_wide);
5708 array[DEVCONF_NDISC_EVICT_NOCARRIER] =
5709 READ_ONCE(cnf->ndisc_evict_nocarrier);
5710 array[DEVCONF_ACCEPT_UNTRACKED_NA] =
5711 READ_ONCE(cnf->accept_untracked_na);
5712 array[DEVCONF_ACCEPT_RA_MIN_LFT] = READ_ONCE(cnf->accept_ra_min_lft);
5713}
5714
5715static inline size_t inet6_ifla6_size(void)
5716{
5717 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5718 + nla_total_size(sizeof(struct ifla_cacheinfo))
5719 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5720 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5721 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5722 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5723 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5724 + nla_total_size(4) /* IFLA_INET6_RA_MTU */
5725 + 0;
5726}
5727
5728static inline size_t inet6_if_nlmsg_size(void)
5729{
5730 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5731 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5732 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5733 + nla_total_size(4) /* IFLA_MTU */
5734 + nla_total_size(4) /* IFLA_LINK */
5735 + nla_total_size(1) /* IFLA_OPERSTATE */
5736 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5737}
5738
5739static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5740 int bytes)
5741{
5742 int i;
5743 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5744 BUG_ON(pad < 0);
5745
5746 /* Use put_unaligned() because stats may not be aligned for u64. */
5747 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5748 for (i = 1; i < ICMP6_MIB_MAX; i++)
5749 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5750
5751 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5752}
5753
5754static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5755 int bytes, size_t syncpoff)
5756{
5757 int i, c;
5758 u64 buff[IPSTATS_MIB_MAX];
5759 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5760
5761 BUG_ON(pad < 0);
5762
5763 memset(buff, 0, sizeof(buff));
5764 buff[0] = IPSTATS_MIB_MAX;
5765
5766 for_each_possible_cpu(c) {
5767 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5768 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5769 }
5770
5771 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5772 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5773}
5774
5775static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5776 int bytes)
5777{
5778 switch (attrtype) {
5779 case IFLA_INET6_STATS:
5780 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5781 offsetof(struct ipstats_mib, syncp));
5782 break;
5783 case IFLA_INET6_ICMP6STATS:
5784 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5785 break;
5786 }
5787}
5788
5789static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5790 u32 ext_filter_mask)
5791{
5792 struct ifla_cacheinfo ci;
5793 struct nlattr *nla;
5794 u32 ra_mtu;
5795
5796 if (nla_put_u32(skb, IFLA_INET6_FLAGS, READ_ONCE(idev->if_flags)))
5797 goto nla_put_failure;
5798 ci.max_reasm_len = IPV6_MAXPLEN;
5799 ci.tstamp = cstamp_delta(READ_ONCE(idev->tstamp));
5800 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5801 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5802 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5803 goto nla_put_failure;
5804 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5805 if (!nla)
5806 goto nla_put_failure;
5807 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5808
5809 /* XXX - MC not implemented */
5810
5811 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5812 return 0;
5813
5814 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5815 if (!nla)
5816 goto nla_put_failure;
5817 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5818
5819 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5820 if (!nla)
5821 goto nla_put_failure;
5822 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5823
5824 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5825 if (!nla)
5826 goto nla_put_failure;
5827 read_lock_bh(&idev->lock);
5828 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5829 read_unlock_bh(&idev->lock);
5830
5831 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE,
5832 READ_ONCE(idev->cnf.addr_gen_mode)))
5833 goto nla_put_failure;
5834
5835 ra_mtu = READ_ONCE(idev->ra_mtu);
5836 if (ra_mtu && nla_put_u32(skb, IFLA_INET6_RA_MTU, ra_mtu))
5837 goto nla_put_failure;
5838
5839 return 0;
5840
5841nla_put_failure:
5842 return -EMSGSIZE;
5843}
5844
5845static size_t inet6_get_link_af_size(const struct net_device *dev,
5846 u32 ext_filter_mask)
5847{
5848 if (!__in6_dev_get(dev))
5849 return 0;
5850
5851 return inet6_ifla6_size();
5852}
5853
5854static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5855 u32 ext_filter_mask)
5856{
5857 struct inet6_dev *idev = __in6_dev_get(dev);
5858
5859 if (!idev)
5860 return -ENODATA;
5861
5862 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5863 return -EMSGSIZE;
5864
5865 return 0;
5866}
5867
5868static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5869 struct netlink_ext_ack *extack)
5870{
5871 struct inet6_ifaddr *ifp;
5872 struct net_device *dev = idev->dev;
5873 bool clear_token, update_rs = false;
5874 struct in6_addr ll_addr;
5875
5876 ASSERT_RTNL();
5877
5878 if (!token)
5879 return -EINVAL;
5880
5881 if (dev->flags & IFF_LOOPBACK) {
5882 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
5883 return -EINVAL;
5884 }
5885
5886 if (dev->flags & IFF_NOARP) {
5887 NL_SET_ERR_MSG_MOD(extack,
5888 "Device does not do neighbour discovery");
5889 return -EINVAL;
5890 }
5891
5892 if (!ipv6_accept_ra(idev)) {
5893 NL_SET_ERR_MSG_MOD(extack,
5894 "Router advertisement is disabled on device");
5895 return -EINVAL;
5896 }
5897
5898 if (READ_ONCE(idev->cnf.rtr_solicits) == 0) {
5899 NL_SET_ERR_MSG(extack,
5900 "Router solicitation is disabled on device");
5901 return -EINVAL;
5902 }
5903
5904 write_lock_bh(&idev->lock);
5905
5906 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5907 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5908
5909 write_unlock_bh(&idev->lock);
5910
5911 clear_token = ipv6_addr_any(token);
5912 if (clear_token)
5913 goto update_lft;
5914
5915 if (!idev->dead && (idev->if_flags & IF_READY) &&
5916 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5917 IFA_F_OPTIMISTIC)) {
5918 /* If we're not ready, then normal ifup will take care
5919 * of this. Otherwise, we need to request our rs here.
5920 */
5921 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5922 update_rs = true;
5923 }
5924
5925update_lft:
5926 write_lock_bh(&idev->lock);
5927
5928 if (update_rs) {
5929 idev->if_flags |= IF_RS_SENT;
5930 idev->rs_interval = rfc3315_s14_backoff_init(
5931 READ_ONCE(idev->cnf.rtr_solicit_interval));
5932 idev->rs_probes = 1;
5933 addrconf_mod_rs_timer(idev, idev->rs_interval);
5934 }
5935
5936 /* Well, that's kinda nasty ... */
5937 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5938 spin_lock(&ifp->lock);
5939 if (ifp->tokenized) {
5940 ifp->valid_lft = 0;
5941 ifp->prefered_lft = 0;
5942 }
5943 spin_unlock(&ifp->lock);
5944 }
5945
5946 write_unlock_bh(&idev->lock);
5947 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5948 addrconf_verify_rtnl(dev_net(dev));
5949 return 0;
5950}
5951
5952static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5953 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5954 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5955 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT,
5956 .reject_message =
5957 "IFLA_INET6_RA_MTU can not be set" },
5958};
5959
5960static int check_addr_gen_mode(int mode)
5961{
5962 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5963 mode != IN6_ADDR_GEN_MODE_NONE &&
5964 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5965 mode != IN6_ADDR_GEN_MODE_RANDOM)
5966 return -EINVAL;
5967 return 1;
5968}
5969
5970static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5971 int mode)
5972{
5973 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5974 !idev->cnf.stable_secret.initialized &&
5975 !net->ipv6.devconf_dflt->stable_secret.initialized)
5976 return -EINVAL;
5977 return 1;
5978}
5979
5980static int inet6_validate_link_af(const struct net_device *dev,
5981 const struct nlattr *nla,
5982 struct netlink_ext_ack *extack)
5983{
5984 struct nlattr *tb[IFLA_INET6_MAX + 1];
5985 struct inet6_dev *idev = NULL;
5986 int err;
5987
5988 if (dev) {
5989 idev = __in6_dev_get(dev);
5990 if (!idev)
5991 return -EAFNOSUPPORT;
5992 }
5993
5994 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5995 inet6_af_policy, extack);
5996 if (err)
5997 return err;
5998
5999 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
6000 return -EINVAL;
6001
6002 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
6003 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
6004
6005 if (check_addr_gen_mode(mode) < 0)
6006 return -EINVAL;
6007 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
6008 return -EINVAL;
6009 }
6010
6011 return 0;
6012}
6013
6014static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
6015 struct netlink_ext_ack *extack)
6016{
6017 struct inet6_dev *idev = __in6_dev_get(dev);
6018 struct nlattr *tb[IFLA_INET6_MAX + 1];
6019 int err;
6020
6021 if (!idev)
6022 return -EAFNOSUPPORT;
6023
6024 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
6025 return -EINVAL;
6026
6027 if (tb[IFLA_INET6_TOKEN]) {
6028 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
6029 extack);
6030 if (err)
6031 return err;
6032 }
6033
6034 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
6035 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
6036
6037 WRITE_ONCE(idev->cnf.addr_gen_mode, mode);
6038 }
6039
6040 return 0;
6041}
6042
6043static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
6044 u32 portid, u32 seq, int event, unsigned int flags)
6045{
6046 struct net_device *dev = idev->dev;
6047 struct ifinfomsg *hdr;
6048 struct nlmsghdr *nlh;
6049 int ifindex, iflink;
6050 void *protoinfo;
6051
6052 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
6053 if (!nlh)
6054 return -EMSGSIZE;
6055
6056 hdr = nlmsg_data(nlh);
6057 hdr->ifi_family = AF_INET6;
6058 hdr->__ifi_pad = 0;
6059 hdr->ifi_type = dev->type;
6060 ifindex = READ_ONCE(dev->ifindex);
6061 hdr->ifi_index = ifindex;
6062 hdr->ifi_flags = dev_get_flags(dev);
6063 hdr->ifi_change = 0;
6064
6065 iflink = dev_get_iflink(dev);
6066 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
6067 (dev->addr_len &&
6068 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
6069 nla_put_u32(skb, IFLA_MTU, READ_ONCE(dev->mtu)) ||
6070 (ifindex != iflink &&
6071 nla_put_u32(skb, IFLA_LINK, iflink)) ||
6072 nla_put_u8(skb, IFLA_OPERSTATE,
6073 netif_running(dev) ? READ_ONCE(dev->operstate) : IF_OPER_DOWN))
6074 goto nla_put_failure;
6075 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
6076 if (!protoinfo)
6077 goto nla_put_failure;
6078
6079 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
6080 goto nla_put_failure;
6081
6082 nla_nest_end(skb, protoinfo);
6083 nlmsg_end(skb, nlh);
6084 return 0;
6085
6086nla_put_failure:
6087 nlmsg_cancel(skb, nlh);
6088 return -EMSGSIZE;
6089}
6090
6091static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
6092 struct netlink_ext_ack *extack)
6093{
6094 struct ifinfomsg *ifm;
6095
6096 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
6097 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
6098 return -EINVAL;
6099 }
6100
6101 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
6102 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
6103 return -EINVAL;
6104 }
6105
6106 ifm = nlmsg_data(nlh);
6107 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
6108 ifm->ifi_change || ifm->ifi_index) {
6109 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
6110 return -EINVAL;
6111 }
6112
6113 return 0;
6114}
6115
6116static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
6117{
6118 struct net *net = sock_net(skb->sk);
6119 struct {
6120 unsigned long ifindex;
6121 } *ctx = (void *)cb->ctx;
6122 struct net_device *dev;
6123 struct inet6_dev *idev;
6124 int err;
6125
6126 /* only requests using strict checking can pass data to
6127 * influence the dump
6128 */
6129 if (cb->strict_check) {
6130 err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
6131
6132 if (err < 0)
6133 return err;
6134 }
6135
6136 err = 0;
6137 rcu_read_lock();
6138 for_each_netdev_dump(net, dev, ctx->ifindex) {
6139 idev = __in6_dev_get(dev);
6140 if (!idev)
6141 continue;
6142 err = inet6_fill_ifinfo(skb, idev,
6143 NETLINK_CB(cb->skb).portid,
6144 cb->nlh->nlmsg_seq,
6145 RTM_NEWLINK, NLM_F_MULTI);
6146 if (err < 0)
6147 break;
6148 }
6149 rcu_read_unlock();
6150
6151 return err;
6152}
6153
6154void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
6155{
6156 struct sk_buff *skb;
6157 struct net *net = dev_net(idev->dev);
6158 int err = -ENOBUFS;
6159
6160 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
6161 if (!skb)
6162 goto errout;
6163
6164 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
6165 if (err < 0) {
6166 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
6167 WARN_ON(err == -EMSGSIZE);
6168 kfree_skb(skb);
6169 goto errout;
6170 }
6171 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
6172 return;
6173errout:
6174 if (err < 0)
6175 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
6176}
6177
6178static inline size_t inet6_prefix_nlmsg_size(void)
6179{
6180 return NLMSG_ALIGN(sizeof(struct prefixmsg))
6181 + nla_total_size(sizeof(struct in6_addr))
6182 + nla_total_size(sizeof(struct prefix_cacheinfo));
6183}
6184
6185static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6186 struct prefix_info *pinfo, u32 portid, u32 seq,
6187 int event, unsigned int flags)
6188{
6189 struct prefixmsg *pmsg;
6190 struct nlmsghdr *nlh;
6191 struct prefix_cacheinfo ci;
6192
6193 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6194 if (!nlh)
6195 return -EMSGSIZE;
6196
6197 pmsg = nlmsg_data(nlh);
6198 pmsg->prefix_family = AF_INET6;
6199 pmsg->prefix_pad1 = 0;
6200 pmsg->prefix_pad2 = 0;
6201 pmsg->prefix_ifindex = idev->dev->ifindex;
6202 pmsg->prefix_len = pinfo->prefix_len;
6203 pmsg->prefix_type = pinfo->type;
6204 pmsg->prefix_pad3 = 0;
6205 pmsg->prefix_flags = pinfo->flags;
6206
6207 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6208 goto nla_put_failure;
6209 ci.preferred_time = ntohl(pinfo->prefered);
6210 ci.valid_time = ntohl(pinfo->valid);
6211 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6212 goto nla_put_failure;
6213 nlmsg_end(skb, nlh);
6214 return 0;
6215
6216nla_put_failure:
6217 nlmsg_cancel(skb, nlh);
6218 return -EMSGSIZE;
6219}
6220
6221static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6222 struct prefix_info *pinfo)
6223{
6224 struct sk_buff *skb;
6225 struct net *net = dev_net(idev->dev);
6226 int err = -ENOBUFS;
6227
6228 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6229 if (!skb)
6230 goto errout;
6231
6232 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6233 if (err < 0) {
6234 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6235 WARN_ON(err == -EMSGSIZE);
6236 kfree_skb(skb);
6237 goto errout;
6238 }
6239 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6240 return;
6241errout:
6242 if (err < 0)
6243 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6244}
6245
6246static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6247{
6248 struct net *net = dev_net(ifp->idev->dev);
6249
6250 if (event)
6251 ASSERT_RTNL();
6252
6253 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6254
6255 switch (event) {
6256 case RTM_NEWADDR:
6257 /*
6258 * If the address was optimistic we inserted the route at the
6259 * start of our DAD process, so we don't need to do it again.
6260 * If the device was taken down in the middle of the DAD
6261 * cycle there is a race where we could get here without a
6262 * host route, so nothing to insert. That will be fixed when
6263 * the device is brought up.
6264 */
6265 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6266 ip6_ins_rt(net, ifp->rt);
6267 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6268 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6269 &ifp->addr, ifp->idev->dev->name);
6270 }
6271
6272 if (ifp->idev->cnf.forwarding)
6273 addrconf_join_anycast(ifp);
6274 if (!ipv6_addr_any(&ifp->peer_addr))
6275 addrconf_prefix_route(&ifp->peer_addr, 128,
6276 ifp->rt_priority, ifp->idev->dev,
6277 0, 0, GFP_ATOMIC);
6278 break;
6279 case RTM_DELADDR:
6280 if (ifp->idev->cnf.forwarding)
6281 addrconf_leave_anycast(ifp);
6282 addrconf_leave_solict(ifp->idev, &ifp->addr);
6283 if (!ipv6_addr_any(&ifp->peer_addr)) {
6284 struct fib6_info *rt;
6285
6286 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6287 ifp->idev->dev, 0, 0,
6288 false);
6289 if (rt)
6290 ip6_del_rt(net, rt, false);
6291 }
6292 if (ifp->rt) {
6293 ip6_del_rt(net, ifp->rt, false);
6294 ifp->rt = NULL;
6295 }
6296 rt_genid_bump_ipv6(net);
6297 break;
6298 }
6299 atomic_inc(&net->ipv6.dev_addr_genid);
6300}
6301
6302static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6303{
6304 if (likely(ifp->idev->dead == 0))
6305 __ipv6_ifa_notify(event, ifp);
6306}
6307
6308#ifdef CONFIG_SYSCTL
6309
6310static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6311 void *buffer, size_t *lenp, loff_t *ppos)
6312{
6313 int *valp = ctl->data;
6314 int val = *valp;
6315 loff_t pos = *ppos;
6316 struct ctl_table lctl;
6317 int ret;
6318
6319 /*
6320 * ctl->data points to idev->cnf.forwarding, we should
6321 * not modify it until we get the rtnl lock.
6322 */
6323 lctl = *ctl;
6324 lctl.data = &val;
6325
6326 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6327
6328 if (write)
6329 ret = addrconf_fixup_forwarding(ctl, valp, val);
6330 if (ret)
6331 *ppos = pos;
6332 return ret;
6333}
6334
6335static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6336 void *buffer, size_t *lenp, loff_t *ppos)
6337{
6338 struct inet6_dev *idev = ctl->extra1;
6339 int min_mtu = IPV6_MIN_MTU;
6340 struct ctl_table lctl;
6341
6342 lctl = *ctl;
6343 lctl.extra1 = &min_mtu;
6344 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6345
6346 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6347}
6348
6349static void dev_disable_change(struct inet6_dev *idev)
6350{
6351 struct netdev_notifier_info info;
6352
6353 if (!idev || !idev->dev)
6354 return;
6355
6356 netdev_notifier_info_init(&info, idev->dev);
6357 if (idev->cnf.disable_ipv6)
6358 addrconf_notify(NULL, NETDEV_DOWN, &info);
6359 else
6360 addrconf_notify(NULL, NETDEV_UP, &info);
6361}
6362
6363static void addrconf_disable_change(struct net *net, __s32 newf)
6364{
6365 struct net_device *dev;
6366 struct inet6_dev *idev;
6367
6368 for_each_netdev(net, dev) {
6369 idev = __in6_dev_get(dev);
6370 if (idev) {
6371 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6372
6373 WRITE_ONCE(idev->cnf.disable_ipv6, newf);
6374 if (changed)
6375 dev_disable_change(idev);
6376 }
6377 }
6378}
6379
6380static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6381{
6382 struct net *net = (struct net *)table->extra2;
6383 int old;
6384
6385 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6386 WRITE_ONCE(*p, newf);
6387 return 0;
6388 }
6389
6390 if (!rtnl_trylock())
6391 return restart_syscall();
6392
6393 old = *p;
6394 WRITE_ONCE(*p, newf);
6395
6396 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6397 WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf);
6398 addrconf_disable_change(net, newf);
6399 } else if ((!newf) ^ (!old))
6400 dev_disable_change((struct inet6_dev *)table->extra1);
6401
6402 rtnl_unlock();
6403 return 0;
6404}
6405
6406static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6407 void *buffer, size_t *lenp, loff_t *ppos)
6408{
6409 int *valp = ctl->data;
6410 int val = *valp;
6411 loff_t pos = *ppos;
6412 struct ctl_table lctl;
6413 int ret;
6414
6415 /*
6416 * ctl->data points to idev->cnf.disable_ipv6, we should
6417 * not modify it until we get the rtnl lock.
6418 */
6419 lctl = *ctl;
6420 lctl.data = &val;
6421
6422 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6423
6424 if (write)
6425 ret = addrconf_disable_ipv6(ctl, valp, val);
6426 if (ret)
6427 *ppos = pos;
6428 return ret;
6429}
6430
6431static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6432 void *buffer, size_t *lenp, loff_t *ppos)
6433{
6434 int *valp = ctl->data;
6435 int ret;
6436 int old, new;
6437
6438 old = *valp;
6439 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6440 new = *valp;
6441
6442 if (write && old != new) {
6443 struct net *net = ctl->extra2;
6444
6445 if (!rtnl_trylock())
6446 return restart_syscall();
6447
6448 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6449 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6450 NETCONFA_PROXY_NEIGH,
6451 NETCONFA_IFINDEX_DEFAULT,
6452 net->ipv6.devconf_dflt);
6453 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6454 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6455 NETCONFA_PROXY_NEIGH,
6456 NETCONFA_IFINDEX_ALL,
6457 net->ipv6.devconf_all);
6458 else {
6459 struct inet6_dev *idev = ctl->extra1;
6460
6461 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6462 NETCONFA_PROXY_NEIGH,
6463 idev->dev->ifindex,
6464 &idev->cnf);
6465 }
6466 rtnl_unlock();
6467 }
6468
6469 return ret;
6470}
6471
6472static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6473 void *buffer, size_t *lenp,
6474 loff_t *ppos)
6475{
6476 int ret = 0;
6477 u32 new_val;
6478 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6479 struct net *net = (struct net *)ctl->extra2;
6480 struct ctl_table tmp = {
6481 .data = &new_val,
6482 .maxlen = sizeof(new_val),
6483 .mode = ctl->mode,
6484 };
6485
6486 if (!rtnl_trylock())
6487 return restart_syscall();
6488
6489 new_val = *((u32 *)ctl->data);
6490
6491 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6492 if (ret != 0)
6493 goto out;
6494
6495 if (write) {
6496 if (check_addr_gen_mode(new_val) < 0) {
6497 ret = -EINVAL;
6498 goto out;
6499 }
6500
6501 if (idev) {
6502 if (check_stable_privacy(idev, net, new_val) < 0) {
6503 ret = -EINVAL;
6504 goto out;
6505 }
6506
6507 if (idev->cnf.addr_gen_mode != new_val) {
6508 WRITE_ONCE(idev->cnf.addr_gen_mode, new_val);
6509 addrconf_init_auto_addrs(idev->dev);
6510 }
6511 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6512 struct net_device *dev;
6513
6514 WRITE_ONCE(net->ipv6.devconf_dflt->addr_gen_mode, new_val);
6515 for_each_netdev(net, dev) {
6516 idev = __in6_dev_get(dev);
6517 if (idev &&
6518 idev->cnf.addr_gen_mode != new_val) {
6519 WRITE_ONCE(idev->cnf.addr_gen_mode,
6520 new_val);
6521 addrconf_init_auto_addrs(idev->dev);
6522 }
6523 }
6524 }
6525
6526 WRITE_ONCE(*((u32 *)ctl->data), new_val);
6527 }
6528
6529out:
6530 rtnl_unlock();
6531
6532 return ret;
6533}
6534
6535static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6536 void *buffer, size_t *lenp,
6537 loff_t *ppos)
6538{
6539 int err;
6540 struct in6_addr addr;
6541 char str[IPV6_MAX_STRLEN];
6542 struct ctl_table lctl = *ctl;
6543 struct net *net = ctl->extra2;
6544 struct ipv6_stable_secret *secret = ctl->data;
6545
6546 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6547 return -EIO;
6548
6549 lctl.maxlen = IPV6_MAX_STRLEN;
6550 lctl.data = str;
6551
6552 if (!rtnl_trylock())
6553 return restart_syscall();
6554
6555 if (!write && !secret->initialized) {
6556 err = -EIO;
6557 goto out;
6558 }
6559
6560 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6561 if (err >= sizeof(str)) {
6562 err = -EIO;
6563 goto out;
6564 }
6565
6566 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6567 if (err || !write)
6568 goto out;
6569
6570 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6571 err = -EIO;
6572 goto out;
6573 }
6574
6575 secret->initialized = true;
6576 secret->secret = addr;
6577
6578 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6579 struct net_device *dev;
6580
6581 for_each_netdev(net, dev) {
6582 struct inet6_dev *idev = __in6_dev_get(dev);
6583
6584 if (idev) {
6585 WRITE_ONCE(idev->cnf.addr_gen_mode,
6586 IN6_ADDR_GEN_MODE_STABLE_PRIVACY);
6587 }
6588 }
6589 } else {
6590 struct inet6_dev *idev = ctl->extra1;
6591
6592 WRITE_ONCE(idev->cnf.addr_gen_mode,
6593 IN6_ADDR_GEN_MODE_STABLE_PRIVACY);
6594 }
6595
6596out:
6597 rtnl_unlock();
6598
6599 return err;
6600}
6601
6602static
6603int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6604 int write, void *buffer,
6605 size_t *lenp,
6606 loff_t *ppos)
6607{
6608 int *valp = ctl->data;
6609 int val = *valp;
6610 loff_t pos = *ppos;
6611 struct ctl_table lctl;
6612 int ret;
6613
6614 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6615 * we should not modify it until we get the rtnl lock.
6616 */
6617 lctl = *ctl;
6618 lctl.data = &val;
6619
6620 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6621
6622 if (write)
6623 ret = addrconf_fixup_linkdown(ctl, valp, val);
6624 if (ret)
6625 *ppos = pos;
6626 return ret;
6627}
6628
6629static
6630void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6631{
6632 if (rt) {
6633 if (action)
6634 rt->dst.flags |= DST_NOPOLICY;
6635 else
6636 rt->dst.flags &= ~DST_NOPOLICY;
6637 }
6638}
6639
6640static
6641void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6642{
6643 struct inet6_ifaddr *ifa;
6644
6645 read_lock_bh(&idev->lock);
6646 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6647 spin_lock(&ifa->lock);
6648 if (ifa->rt) {
6649 /* host routes only use builtin fib6_nh */
6650 struct fib6_nh *nh = ifa->rt->fib6_nh;
6651 int cpu;
6652
6653 rcu_read_lock();
6654 ifa->rt->dst_nopolicy = val ? true : false;
6655 if (nh->rt6i_pcpu) {
6656 for_each_possible_cpu(cpu) {
6657 struct rt6_info **rtp;
6658
6659 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6660 addrconf_set_nopolicy(*rtp, val);
6661 }
6662 }
6663 rcu_read_unlock();
6664 }
6665 spin_unlock(&ifa->lock);
6666 }
6667 read_unlock_bh(&idev->lock);
6668}
6669
6670static
6671int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6672{
6673 struct net *net = (struct net *)ctl->extra2;
6674 struct inet6_dev *idev;
6675
6676 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6677 WRITE_ONCE(*valp, val);
6678 return 0;
6679 }
6680
6681 if (!rtnl_trylock())
6682 return restart_syscall();
6683
6684 WRITE_ONCE(*valp, val);
6685
6686 if (valp == &net->ipv6.devconf_all->disable_policy) {
6687 struct net_device *dev;
6688
6689 for_each_netdev(net, dev) {
6690 idev = __in6_dev_get(dev);
6691 if (idev)
6692 addrconf_disable_policy_idev(idev, val);
6693 }
6694 } else {
6695 idev = (struct inet6_dev *)ctl->extra1;
6696 addrconf_disable_policy_idev(idev, val);
6697 }
6698
6699 rtnl_unlock();
6700 return 0;
6701}
6702
6703static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6704 void *buffer, size_t *lenp, loff_t *ppos)
6705{
6706 int *valp = ctl->data;
6707 int val = *valp;
6708 loff_t pos = *ppos;
6709 struct ctl_table lctl;
6710 int ret;
6711
6712 lctl = *ctl;
6713 lctl.data = &val;
6714 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6715
6716 if (write && (*valp != val))
6717 ret = addrconf_disable_policy(ctl, valp, val);
6718
6719 if (ret)
6720 *ppos = pos;
6721
6722 return ret;
6723}
6724
6725static int minus_one = -1;
6726static const int two_five_five = 255;
6727static u32 ioam6_if_id_max = U16_MAX;
6728
6729static const struct ctl_table addrconf_sysctl[] = {
6730 {
6731 .procname = "forwarding",
6732 .data = &ipv6_devconf.forwarding,
6733 .maxlen = sizeof(int),
6734 .mode = 0644,
6735 .proc_handler = addrconf_sysctl_forward,
6736 },
6737 {
6738 .procname = "hop_limit",
6739 .data = &ipv6_devconf.hop_limit,
6740 .maxlen = sizeof(int),
6741 .mode = 0644,
6742 .proc_handler = proc_dointvec_minmax,
6743 .extra1 = (void *)SYSCTL_ONE,
6744 .extra2 = (void *)&two_five_five,
6745 },
6746 {
6747 .procname = "mtu",
6748 .data = &ipv6_devconf.mtu6,
6749 .maxlen = sizeof(int),
6750 .mode = 0644,
6751 .proc_handler = addrconf_sysctl_mtu,
6752 },
6753 {
6754 .procname = "accept_ra",
6755 .data = &ipv6_devconf.accept_ra,
6756 .maxlen = sizeof(int),
6757 .mode = 0644,
6758 .proc_handler = proc_dointvec,
6759 },
6760 {
6761 .procname = "accept_redirects",
6762 .data = &ipv6_devconf.accept_redirects,
6763 .maxlen = sizeof(int),
6764 .mode = 0644,
6765 .proc_handler = proc_dointvec,
6766 },
6767 {
6768 .procname = "autoconf",
6769 .data = &ipv6_devconf.autoconf,
6770 .maxlen = sizeof(int),
6771 .mode = 0644,
6772 .proc_handler = proc_dointvec,
6773 },
6774 {
6775 .procname = "dad_transmits",
6776 .data = &ipv6_devconf.dad_transmits,
6777 .maxlen = sizeof(int),
6778 .mode = 0644,
6779 .proc_handler = proc_dointvec,
6780 },
6781 {
6782 .procname = "router_solicitations",
6783 .data = &ipv6_devconf.rtr_solicits,
6784 .maxlen = sizeof(int),
6785 .mode = 0644,
6786 .proc_handler = proc_dointvec_minmax,
6787 .extra1 = &minus_one,
6788 },
6789 {
6790 .procname = "router_solicitation_interval",
6791 .data = &ipv6_devconf.rtr_solicit_interval,
6792 .maxlen = sizeof(int),
6793 .mode = 0644,
6794 .proc_handler = proc_dointvec_jiffies,
6795 },
6796 {
6797 .procname = "router_solicitation_max_interval",
6798 .data = &ipv6_devconf.rtr_solicit_max_interval,
6799 .maxlen = sizeof(int),
6800 .mode = 0644,
6801 .proc_handler = proc_dointvec_jiffies,
6802 },
6803 {
6804 .procname = "router_solicitation_delay",
6805 .data = &ipv6_devconf.rtr_solicit_delay,
6806 .maxlen = sizeof(int),
6807 .mode = 0644,
6808 .proc_handler = proc_dointvec_jiffies,
6809 },
6810 {
6811 .procname = "force_mld_version",
6812 .data = &ipv6_devconf.force_mld_version,
6813 .maxlen = sizeof(int),
6814 .mode = 0644,
6815 .proc_handler = proc_dointvec,
6816 },
6817 {
6818 .procname = "mldv1_unsolicited_report_interval",
6819 .data =
6820 &ipv6_devconf.mldv1_unsolicited_report_interval,
6821 .maxlen = sizeof(int),
6822 .mode = 0644,
6823 .proc_handler = proc_dointvec_ms_jiffies,
6824 },
6825 {
6826 .procname = "mldv2_unsolicited_report_interval",
6827 .data =
6828 &ipv6_devconf.mldv2_unsolicited_report_interval,
6829 .maxlen = sizeof(int),
6830 .mode = 0644,
6831 .proc_handler = proc_dointvec_ms_jiffies,
6832 },
6833 {
6834 .procname = "use_tempaddr",
6835 .data = &ipv6_devconf.use_tempaddr,
6836 .maxlen = sizeof(int),
6837 .mode = 0644,
6838 .proc_handler = proc_dointvec,
6839 },
6840 {
6841 .procname = "temp_valid_lft",
6842 .data = &ipv6_devconf.temp_valid_lft,
6843 .maxlen = sizeof(int),
6844 .mode = 0644,
6845 .proc_handler = proc_dointvec,
6846 },
6847 {
6848 .procname = "temp_prefered_lft",
6849 .data = &ipv6_devconf.temp_prefered_lft,
6850 .maxlen = sizeof(int),
6851 .mode = 0644,
6852 .proc_handler = proc_dointvec,
6853 },
6854 {
6855 .procname = "regen_min_advance",
6856 .data = &ipv6_devconf.regen_min_advance,
6857 .maxlen = sizeof(int),
6858 .mode = 0644,
6859 .proc_handler = proc_dointvec,
6860 },
6861 {
6862 .procname = "regen_max_retry",
6863 .data = &ipv6_devconf.regen_max_retry,
6864 .maxlen = sizeof(int),
6865 .mode = 0644,
6866 .proc_handler = proc_dointvec,
6867 },
6868 {
6869 .procname = "max_desync_factor",
6870 .data = &ipv6_devconf.max_desync_factor,
6871 .maxlen = sizeof(int),
6872 .mode = 0644,
6873 .proc_handler = proc_dointvec,
6874 },
6875 {
6876 .procname = "max_addresses",
6877 .data = &ipv6_devconf.max_addresses,
6878 .maxlen = sizeof(int),
6879 .mode = 0644,
6880 .proc_handler = proc_dointvec,
6881 },
6882 {
6883 .procname = "accept_ra_defrtr",
6884 .data = &ipv6_devconf.accept_ra_defrtr,
6885 .maxlen = sizeof(int),
6886 .mode = 0644,
6887 .proc_handler = proc_dointvec,
6888 },
6889 {
6890 .procname = "ra_defrtr_metric",
6891 .data = &ipv6_devconf.ra_defrtr_metric,
6892 .maxlen = sizeof(u32),
6893 .mode = 0644,
6894 .proc_handler = proc_douintvec_minmax,
6895 .extra1 = (void *)SYSCTL_ONE,
6896 },
6897 {
6898 .procname = "accept_ra_min_hop_limit",
6899 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6900 .maxlen = sizeof(int),
6901 .mode = 0644,
6902 .proc_handler = proc_dointvec,
6903 },
6904 {
6905 .procname = "accept_ra_min_lft",
6906 .data = &ipv6_devconf.accept_ra_min_lft,
6907 .maxlen = sizeof(int),
6908 .mode = 0644,
6909 .proc_handler = proc_dointvec,
6910 },
6911 {
6912 .procname = "accept_ra_pinfo",
6913 .data = &ipv6_devconf.accept_ra_pinfo,
6914 .maxlen = sizeof(int),
6915 .mode = 0644,
6916 .proc_handler = proc_dointvec,
6917 },
6918 {
6919 .procname = "ra_honor_pio_life",
6920 .data = &ipv6_devconf.ra_honor_pio_life,
6921 .maxlen = sizeof(u8),
6922 .mode = 0644,
6923 .proc_handler = proc_dou8vec_minmax,
6924 .extra1 = SYSCTL_ZERO,
6925 .extra2 = SYSCTL_ONE,
6926 },
6927#ifdef CONFIG_IPV6_ROUTER_PREF
6928 {
6929 .procname = "accept_ra_rtr_pref",
6930 .data = &ipv6_devconf.accept_ra_rtr_pref,
6931 .maxlen = sizeof(int),
6932 .mode = 0644,
6933 .proc_handler = proc_dointvec,
6934 },
6935 {
6936 .procname = "router_probe_interval",
6937 .data = &ipv6_devconf.rtr_probe_interval,
6938 .maxlen = sizeof(int),
6939 .mode = 0644,
6940 .proc_handler = proc_dointvec_jiffies,
6941 },
6942#ifdef CONFIG_IPV6_ROUTE_INFO
6943 {
6944 .procname = "accept_ra_rt_info_min_plen",
6945 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6946 .maxlen = sizeof(int),
6947 .mode = 0644,
6948 .proc_handler = proc_dointvec,
6949 },
6950 {
6951 .procname = "accept_ra_rt_info_max_plen",
6952 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6953 .maxlen = sizeof(int),
6954 .mode = 0644,
6955 .proc_handler = proc_dointvec,
6956 },
6957#endif
6958#endif
6959 {
6960 .procname = "proxy_ndp",
6961 .data = &ipv6_devconf.proxy_ndp,
6962 .maxlen = sizeof(int),
6963 .mode = 0644,
6964 .proc_handler = addrconf_sysctl_proxy_ndp,
6965 },
6966 {
6967 .procname = "accept_source_route",
6968 .data = &ipv6_devconf.accept_source_route,
6969 .maxlen = sizeof(int),
6970 .mode = 0644,
6971 .proc_handler = proc_dointvec,
6972 },
6973#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6974 {
6975 .procname = "optimistic_dad",
6976 .data = &ipv6_devconf.optimistic_dad,
6977 .maxlen = sizeof(int),
6978 .mode = 0644,
6979 .proc_handler = proc_dointvec,
6980 },
6981 {
6982 .procname = "use_optimistic",
6983 .data = &ipv6_devconf.use_optimistic,
6984 .maxlen = sizeof(int),
6985 .mode = 0644,
6986 .proc_handler = proc_dointvec,
6987 },
6988#endif
6989#ifdef CONFIG_IPV6_MROUTE
6990 {
6991 .procname = "mc_forwarding",
6992 .data = &ipv6_devconf.mc_forwarding,
6993 .maxlen = sizeof(int),
6994 .mode = 0444,
6995 .proc_handler = proc_dointvec,
6996 },
6997#endif
6998 {
6999 .procname = "disable_ipv6",
7000 .data = &ipv6_devconf.disable_ipv6,
7001 .maxlen = sizeof(int),
7002 .mode = 0644,
7003 .proc_handler = addrconf_sysctl_disable,
7004 },
7005 {
7006 .procname = "accept_dad",
7007 .data = &ipv6_devconf.accept_dad,
7008 .maxlen = sizeof(int),
7009 .mode = 0644,
7010 .proc_handler = proc_dointvec,
7011 },
7012 {
7013 .procname = "force_tllao",
7014 .data = &ipv6_devconf.force_tllao,
7015 .maxlen = sizeof(int),
7016 .mode = 0644,
7017 .proc_handler = proc_dointvec
7018 },
7019 {
7020 .procname = "ndisc_notify",
7021 .data = &ipv6_devconf.ndisc_notify,
7022 .maxlen = sizeof(int),
7023 .mode = 0644,
7024 .proc_handler = proc_dointvec
7025 },
7026 {
7027 .procname = "suppress_frag_ndisc",
7028 .data = &ipv6_devconf.suppress_frag_ndisc,
7029 .maxlen = sizeof(int),
7030 .mode = 0644,
7031 .proc_handler = proc_dointvec
7032 },
7033 {
7034 .procname = "accept_ra_from_local",
7035 .data = &ipv6_devconf.accept_ra_from_local,
7036 .maxlen = sizeof(int),
7037 .mode = 0644,
7038 .proc_handler = proc_dointvec,
7039 },
7040 {
7041 .procname = "accept_ra_mtu",
7042 .data = &ipv6_devconf.accept_ra_mtu,
7043 .maxlen = sizeof(int),
7044 .mode = 0644,
7045 .proc_handler = proc_dointvec,
7046 },
7047 {
7048 .procname = "stable_secret",
7049 .data = &ipv6_devconf.stable_secret,
7050 .maxlen = IPV6_MAX_STRLEN,
7051 .mode = 0600,
7052 .proc_handler = addrconf_sysctl_stable_secret,
7053 },
7054 {
7055 .procname = "use_oif_addrs_only",
7056 .data = &ipv6_devconf.use_oif_addrs_only,
7057 .maxlen = sizeof(int),
7058 .mode = 0644,
7059 .proc_handler = proc_dointvec,
7060 },
7061 {
7062 .procname = "ignore_routes_with_linkdown",
7063 .data = &ipv6_devconf.ignore_routes_with_linkdown,
7064 .maxlen = sizeof(int),
7065 .mode = 0644,
7066 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
7067 },
7068 {
7069 .procname = "drop_unicast_in_l2_multicast",
7070 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
7071 .maxlen = sizeof(int),
7072 .mode = 0644,
7073 .proc_handler = proc_dointvec,
7074 },
7075 {
7076 .procname = "drop_unsolicited_na",
7077 .data = &ipv6_devconf.drop_unsolicited_na,
7078 .maxlen = sizeof(int),
7079 .mode = 0644,
7080 .proc_handler = proc_dointvec,
7081 },
7082 {
7083 .procname = "keep_addr_on_down",
7084 .data = &ipv6_devconf.keep_addr_on_down,
7085 .maxlen = sizeof(int),
7086 .mode = 0644,
7087 .proc_handler = proc_dointvec,
7088
7089 },
7090 {
7091 .procname = "seg6_enabled",
7092 .data = &ipv6_devconf.seg6_enabled,
7093 .maxlen = sizeof(int),
7094 .mode = 0644,
7095 .proc_handler = proc_dointvec,
7096 },
7097#ifdef CONFIG_IPV6_SEG6_HMAC
7098 {
7099 .procname = "seg6_require_hmac",
7100 .data = &ipv6_devconf.seg6_require_hmac,
7101 .maxlen = sizeof(int),
7102 .mode = 0644,
7103 .proc_handler = proc_dointvec,
7104 },
7105#endif
7106 {
7107 .procname = "enhanced_dad",
7108 .data = &ipv6_devconf.enhanced_dad,
7109 .maxlen = sizeof(int),
7110 .mode = 0644,
7111 .proc_handler = proc_dointvec,
7112 },
7113 {
7114 .procname = "addr_gen_mode",
7115 .data = &ipv6_devconf.addr_gen_mode,
7116 .maxlen = sizeof(int),
7117 .mode = 0644,
7118 .proc_handler = addrconf_sysctl_addr_gen_mode,
7119 },
7120 {
7121 .procname = "disable_policy",
7122 .data = &ipv6_devconf.disable_policy,
7123 .maxlen = sizeof(int),
7124 .mode = 0644,
7125 .proc_handler = addrconf_sysctl_disable_policy,
7126 },
7127 {
7128 .procname = "ndisc_tclass",
7129 .data = &ipv6_devconf.ndisc_tclass,
7130 .maxlen = sizeof(int),
7131 .mode = 0644,
7132 .proc_handler = proc_dointvec_minmax,
7133 .extra1 = (void *)SYSCTL_ZERO,
7134 .extra2 = (void *)&two_five_five,
7135 },
7136 {
7137 .procname = "rpl_seg_enabled",
7138 .data = &ipv6_devconf.rpl_seg_enabled,
7139 .maxlen = sizeof(int),
7140 .mode = 0644,
7141 .proc_handler = proc_dointvec,
7142 },
7143 {
7144 .procname = "ioam6_enabled",
7145 .data = &ipv6_devconf.ioam6_enabled,
7146 .maxlen = sizeof(u8),
7147 .mode = 0644,
7148 .proc_handler = proc_dou8vec_minmax,
7149 .extra1 = (void *)SYSCTL_ZERO,
7150 .extra2 = (void *)SYSCTL_ONE,
7151 },
7152 {
7153 .procname = "ioam6_id",
7154 .data = &ipv6_devconf.ioam6_id,
7155 .maxlen = sizeof(u32),
7156 .mode = 0644,
7157 .proc_handler = proc_douintvec_minmax,
7158 .extra1 = (void *)SYSCTL_ZERO,
7159 .extra2 = (void *)&ioam6_if_id_max,
7160 },
7161 {
7162 .procname = "ioam6_id_wide",
7163 .data = &ipv6_devconf.ioam6_id_wide,
7164 .maxlen = sizeof(u32),
7165 .mode = 0644,
7166 .proc_handler = proc_douintvec,
7167 },
7168 {
7169 .procname = "ndisc_evict_nocarrier",
7170 .data = &ipv6_devconf.ndisc_evict_nocarrier,
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 = "accept_untracked_na",
7179 .data = &ipv6_devconf.accept_untracked_na,
7180 .maxlen = sizeof(int),
7181 .mode = 0644,
7182 .proc_handler = proc_dointvec_minmax,
7183 .extra1 = SYSCTL_ZERO,
7184 .extra2 = SYSCTL_TWO,
7185 },
7186 {
7187 /* sentinel */
7188 }
7189};
7190
7191static int __addrconf_sysctl_register(struct net *net, char *dev_name,
7192 struct inet6_dev *idev, struct ipv6_devconf *p)
7193{
7194 int i, ifindex;
7195 struct ctl_table *table;
7196 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
7197
7198 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT);
7199 if (!table)
7200 goto out;
7201
7202 for (i = 0; table[i].data; i++) {
7203 table[i].data += (char *)p - (char *)&ipv6_devconf;
7204 /* If one of these is already set, then it is not safe to
7205 * overwrite either of them: this makes proc_dointvec_minmax
7206 * usable.
7207 */
7208 if (!table[i].extra1 && !table[i].extra2) {
7209 table[i].extra1 = idev; /* embedded; no ref */
7210 table[i].extra2 = net;
7211 }
7212 }
7213
7214 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
7215
7216 p->sysctl_header = register_net_sysctl_sz(net, path, table,
7217 ARRAY_SIZE(addrconf_sysctl));
7218 if (!p->sysctl_header)
7219 goto free;
7220
7221 if (!strcmp(dev_name, "all"))
7222 ifindex = NETCONFA_IFINDEX_ALL;
7223 else if (!strcmp(dev_name, "default"))
7224 ifindex = NETCONFA_IFINDEX_DEFAULT;
7225 else
7226 ifindex = idev->dev->ifindex;
7227 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7228 ifindex, p);
7229 return 0;
7230
7231free:
7232 kfree(table);
7233out:
7234 return -ENOBUFS;
7235}
7236
7237static void __addrconf_sysctl_unregister(struct net *net,
7238 struct ipv6_devconf *p, int ifindex)
7239{
7240 struct ctl_table *table;
7241
7242 if (!p->sysctl_header)
7243 return;
7244
7245 table = p->sysctl_header->ctl_table_arg;
7246 unregister_net_sysctl_table(p->sysctl_header);
7247 p->sysctl_header = NULL;
7248 kfree(table);
7249
7250 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
7251}
7252
7253static int addrconf_sysctl_register(struct inet6_dev *idev)
7254{
7255 int err;
7256
7257 if (!sysctl_dev_name_is_allowed(idev->dev->name))
7258 return -EINVAL;
7259
7260 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7261 &ndisc_ifinfo_sysctl_change);
7262 if (err)
7263 return err;
7264 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7265 idev, &idev->cnf);
7266 if (err)
7267 neigh_sysctl_unregister(idev->nd_parms);
7268
7269 return err;
7270}
7271
7272static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7273{
7274 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7275 idev->dev->ifindex);
7276 neigh_sysctl_unregister(idev->nd_parms);
7277}
7278
7279
7280#endif
7281
7282static int __net_init addrconf_init_net(struct net *net)
7283{
7284 int err = -ENOMEM;
7285 struct ipv6_devconf *all, *dflt;
7286
7287 spin_lock_init(&net->ipv6.addrconf_hash_lock);
7288 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work);
7289 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE,
7290 sizeof(struct hlist_head),
7291 GFP_KERNEL);
7292 if (!net->ipv6.inet6_addr_lst)
7293 goto err_alloc_addr;
7294
7295 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7296 if (!all)
7297 goto err_alloc_all;
7298
7299 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7300 if (!dflt)
7301 goto err_alloc_dflt;
7302
7303 if (!net_eq(net, &init_net)) {
7304 switch (net_inherit_devconf()) {
7305 case 1: /* copy from init_net */
7306 memcpy(all, init_net.ipv6.devconf_all,
7307 sizeof(ipv6_devconf));
7308 memcpy(dflt, init_net.ipv6.devconf_dflt,
7309 sizeof(ipv6_devconf_dflt));
7310 break;
7311 case 3: /* copy from the current netns */
7312 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7313 sizeof(ipv6_devconf));
7314 memcpy(dflt,
7315 current->nsproxy->net_ns->ipv6.devconf_dflt,
7316 sizeof(ipv6_devconf_dflt));
7317 break;
7318 case 0:
7319 case 2:
7320 /* use compiled values */
7321 break;
7322 }
7323 }
7324
7325 /* these will be inherited by all namespaces */
7326 dflt->autoconf = ipv6_defaults.autoconf;
7327 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7328
7329 dflt->stable_secret.initialized = false;
7330 all->stable_secret.initialized = false;
7331
7332 net->ipv6.devconf_all = all;
7333 net->ipv6.devconf_dflt = dflt;
7334
7335#ifdef CONFIG_SYSCTL
7336 err = __addrconf_sysctl_register(net, "all", NULL, all);
7337 if (err < 0)
7338 goto err_reg_all;
7339
7340 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7341 if (err < 0)
7342 goto err_reg_dflt;
7343#endif
7344 return 0;
7345
7346#ifdef CONFIG_SYSCTL
7347err_reg_dflt:
7348 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7349err_reg_all:
7350 kfree(dflt);
7351 net->ipv6.devconf_dflt = NULL;
7352#endif
7353err_alloc_dflt:
7354 kfree(all);
7355 net->ipv6.devconf_all = NULL;
7356err_alloc_all:
7357 kfree(net->ipv6.inet6_addr_lst);
7358err_alloc_addr:
7359 return err;
7360}
7361
7362static void __net_exit addrconf_exit_net(struct net *net)
7363{
7364 int i;
7365
7366#ifdef CONFIG_SYSCTL
7367 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7368 NETCONFA_IFINDEX_DEFAULT);
7369 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7370 NETCONFA_IFINDEX_ALL);
7371#endif
7372 kfree(net->ipv6.devconf_dflt);
7373 net->ipv6.devconf_dflt = NULL;
7374 kfree(net->ipv6.devconf_all);
7375 net->ipv6.devconf_all = NULL;
7376
7377 cancel_delayed_work_sync(&net->ipv6.addr_chk_work);
7378 /*
7379 * Check hash table, then free it.
7380 */
7381 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7382 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i]));
7383
7384 kfree(net->ipv6.inet6_addr_lst);
7385 net->ipv6.inet6_addr_lst = NULL;
7386}
7387
7388static struct pernet_operations addrconf_ops = {
7389 .init = addrconf_init_net,
7390 .exit = addrconf_exit_net,
7391};
7392
7393static struct rtnl_af_ops inet6_ops __read_mostly = {
7394 .family = AF_INET6,
7395 .fill_link_af = inet6_fill_link_af,
7396 .get_link_af_size = inet6_get_link_af_size,
7397 .validate_link_af = inet6_validate_link_af,
7398 .set_link_af = inet6_set_link_af,
7399};
7400
7401/*
7402 * Init / cleanup code
7403 */
7404
7405int __init addrconf_init(void)
7406{
7407 struct inet6_dev *idev;
7408 int err;
7409
7410 err = ipv6_addr_label_init();
7411 if (err < 0) {
7412 pr_crit("%s: cannot initialize default policy table: %d\n",
7413 __func__, err);
7414 goto out;
7415 }
7416
7417 err = register_pernet_subsys(&addrconf_ops);
7418 if (err < 0)
7419 goto out_addrlabel;
7420
7421 /* All works using addrconf_wq need to lock rtnl. */
7422 addrconf_wq = create_singlethread_workqueue("ipv6_addrconf");
7423 if (!addrconf_wq) {
7424 err = -ENOMEM;
7425 goto out_nowq;
7426 }
7427
7428 rtnl_lock();
7429 idev = ipv6_add_dev(blackhole_netdev);
7430 rtnl_unlock();
7431 if (IS_ERR(idev)) {
7432 err = PTR_ERR(idev);
7433 goto errlo;
7434 }
7435
7436 ip6_route_init_special_entries();
7437
7438 register_netdevice_notifier(&ipv6_dev_notf);
7439
7440 addrconf_verify(&init_net);
7441
7442 rtnl_af_register(&inet6_ops);
7443
7444 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7445 NULL, inet6_dump_ifinfo, RTNL_FLAG_DUMP_UNLOCKED);
7446 if (err < 0)
7447 goto errout;
7448
7449 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7450 inet6_rtm_newaddr, NULL, 0);
7451 if (err < 0)
7452 goto errout;
7453 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7454 inet6_rtm_deladdr, NULL, 0);
7455 if (err < 0)
7456 goto errout;
7457 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7458 inet6_rtm_getaddr, inet6_dump_ifaddr,
7459 RTNL_FLAG_DOIT_UNLOCKED |
7460 RTNL_FLAG_DUMP_UNLOCKED);
7461 if (err < 0)
7462 goto errout;
7463 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7464 NULL, inet6_dump_ifmcaddr,
7465 RTNL_FLAG_DUMP_UNLOCKED);
7466 if (err < 0)
7467 goto errout;
7468 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7469 NULL, inet6_dump_ifacaddr,
7470 RTNL_FLAG_DUMP_UNLOCKED);
7471 if (err < 0)
7472 goto errout;
7473 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7474 inet6_netconf_get_devconf,
7475 inet6_netconf_dump_devconf,
7476 RTNL_FLAG_DOIT_UNLOCKED |
7477 RTNL_FLAG_DUMP_UNLOCKED);
7478 if (err < 0)
7479 goto errout;
7480 err = ipv6_addr_label_rtnl_register();
7481 if (err < 0)
7482 goto errout;
7483
7484 return 0;
7485errout:
7486 rtnl_unregister_all(PF_INET6);
7487 rtnl_af_unregister(&inet6_ops);
7488 unregister_netdevice_notifier(&ipv6_dev_notf);
7489errlo:
7490 destroy_workqueue(addrconf_wq);
7491out_nowq:
7492 unregister_pernet_subsys(&addrconf_ops);
7493out_addrlabel:
7494 ipv6_addr_label_cleanup();
7495out:
7496 return err;
7497}
7498
7499void addrconf_cleanup(void)
7500{
7501 struct net_device *dev;
7502
7503 unregister_netdevice_notifier(&ipv6_dev_notf);
7504 unregister_pernet_subsys(&addrconf_ops);
7505 ipv6_addr_label_cleanup();
7506
7507 rtnl_af_unregister(&inet6_ops);
7508
7509 rtnl_lock();
7510
7511 /* clean dev list */
7512 for_each_netdev(&init_net, dev) {
7513 if (__in6_dev_get(dev) == NULL)
7514 continue;
7515 addrconf_ifdown(dev, true);
7516 }
7517 addrconf_ifdown(init_net.loopback_dev, true);
7518
7519 rtnl_unlock();
7520
7521 destroy_workqueue(addrconf_wq);
7522}