Loading...
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/ip_tunnels.h>
67#include <net/net_namespace.h>
68#include <net/sock.h>
69#include <net/snmp.h>
70
71#include <net/6lowpan.h>
72#include <net/firewire.h>
73#include <net/ipv6.h>
74#include <net/protocol.h>
75#include <net/ndisc.h>
76#include <net/ip6_route.h>
77#include <net/addrconf.h>
78#include <net/tcp.h>
79#include <net/ip.h>
80#include <net/netlink.h>
81#include <net/pkt_sched.h>
82#include <net/l3mdev.h>
83#include <linux/if_tunnel.h>
84#include <linux/rtnetlink.h>
85#include <linux/netconf.h>
86#include <linux/random.h>
87#include <linux/uaccess.h>
88#include <linux/unaligned.h>
89
90#include <linux/proc_fs.h>
91#include <linux/seq_file.h>
92#include <linux/export.h>
93#include <linux/ioam6.h>
94
95#define IPV6_MAX_STRLEN \
96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
97
98static inline u32 cstamp_delta(unsigned long cstamp)
99{
100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
101}
102
103static inline s32 rfc3315_s14_backoff_init(s32 irt)
104{
105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
106 u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt;
107 do_div(tmp, 1000000);
108 return (s32)tmp;
109}
110
111static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
112{
113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
114 u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt;
115 do_div(tmp, 1000000);
116 if ((s32)tmp > mrt) {
117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
118 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt;
119 do_div(tmp, 1000000);
120 }
121 return (s32)tmp;
122}
123
124#ifdef CONFIG_SYSCTL
125static int addrconf_sysctl_register(struct inet6_dev *idev);
126static void addrconf_sysctl_unregister(struct inet6_dev *idev);
127#else
128static inline int addrconf_sysctl_register(struct inet6_dev *idev)
129{
130 return 0;
131}
132
133static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
134{
135}
136#endif
137
138static void ipv6_gen_rnd_iid(struct in6_addr *addr);
139
140static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
141static int ipv6_count_addresses(const struct inet6_dev *idev);
142static int ipv6_generate_stable_address(struct in6_addr *addr,
143 u8 dad_count,
144 const struct inet6_dev *idev);
145
146#define IN6_ADDR_HSIZE_SHIFT 8
147#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
148
149static void addrconf_verify(struct net *net);
150static void addrconf_verify_rtnl(struct net *net);
151
152static struct workqueue_struct *addrconf_wq;
153
154static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
155static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
156
157static void addrconf_type_change(struct net_device *dev,
158 unsigned long event);
159static int addrconf_ifdown(struct net_device *dev, bool unregister);
160
161static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
162 int plen,
163 const struct net_device *dev,
164 u32 flags, u32 noflags,
165 bool no_gw);
166
167static void addrconf_dad_start(struct inet6_ifaddr *ifp);
168static void addrconf_dad_work(struct work_struct *w);
169static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
170 bool send_na);
171static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
172static void addrconf_rs_timer(struct timer_list *t);
173static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
174static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
175
176static void inet6_prefix_notify(int event, struct inet6_dev *idev,
177 struct prefix_info *pinfo);
178
179static struct ipv6_devconf ipv6_devconf __read_mostly = {
180 .forwarding = 0,
181 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
182 .mtu6 = IPV6_MIN_MTU,
183 .accept_ra = 1,
184 .accept_redirects = 1,
185 .autoconf = 1,
186 .force_mld_version = 0,
187 .mldv1_unsolicited_report_interval = 10 * HZ,
188 .mldv2_unsolicited_report_interval = HZ,
189 .dad_transmits = 1,
190 .rtr_solicits = MAX_RTR_SOLICITATIONS,
191 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
192 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
193 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
194 .use_tempaddr = 0,
195 .temp_valid_lft = TEMP_VALID_LIFETIME,
196 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
197 .regen_min_advance = REGEN_MIN_ADVANCE,
198 .regen_max_retry = REGEN_MAX_RETRY,
199 .max_desync_factor = MAX_DESYNC_FACTOR,
200 .max_addresses = IPV6_MAX_ADDRESSES,
201 .accept_ra_defrtr = 1,
202 .ra_defrtr_metric = IP6_RT_PRIO_USER,
203 .accept_ra_from_local = 0,
204 .accept_ra_min_hop_limit= 1,
205 .accept_ra_min_lft = 0,
206 .accept_ra_pinfo = 1,
207#ifdef CONFIG_IPV6_ROUTER_PREF
208 .accept_ra_rtr_pref = 1,
209 .rtr_probe_interval = 60 * HZ,
210#ifdef CONFIG_IPV6_ROUTE_INFO
211 .accept_ra_rt_info_min_plen = 0,
212 .accept_ra_rt_info_max_plen = 0,
213#endif
214#endif
215 .proxy_ndp = 0,
216 .accept_source_route = 0, /* we do not accept RH0 by default. */
217 .disable_ipv6 = 0,
218 .accept_dad = 0,
219 .suppress_frag_ndisc = 1,
220 .accept_ra_mtu = 1,
221 .stable_secret = {
222 .initialized = false,
223 },
224 .use_oif_addrs_only = 0,
225 .ignore_routes_with_linkdown = 0,
226 .keep_addr_on_down = 0,
227 .seg6_enabled = 0,
228#ifdef CONFIG_IPV6_SEG6_HMAC
229 .seg6_require_hmac = 0,
230#endif
231 .enhanced_dad = 1,
232 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
233 .disable_policy = 0,
234 .rpl_seg_enabled = 0,
235 .ioam6_enabled = 0,
236 .ioam6_id = IOAM6_DEFAULT_IF_ID,
237 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
238 .ndisc_evict_nocarrier = 1,
239 .ra_honor_pio_life = 0,
240 .ra_honor_pio_pflag = 0,
241};
242
243static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
244 .forwarding = 0,
245 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
246 .mtu6 = IPV6_MIN_MTU,
247 .accept_ra = 1,
248 .accept_redirects = 1,
249 .autoconf = 1,
250 .force_mld_version = 0,
251 .mldv1_unsolicited_report_interval = 10 * HZ,
252 .mldv2_unsolicited_report_interval = HZ,
253 .dad_transmits = 1,
254 .rtr_solicits = MAX_RTR_SOLICITATIONS,
255 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
256 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
257 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
258 .use_tempaddr = 0,
259 .temp_valid_lft = TEMP_VALID_LIFETIME,
260 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
261 .regen_min_advance = REGEN_MIN_ADVANCE,
262 .regen_max_retry = REGEN_MAX_RETRY,
263 .max_desync_factor = MAX_DESYNC_FACTOR,
264 .max_addresses = IPV6_MAX_ADDRESSES,
265 .accept_ra_defrtr = 1,
266 .ra_defrtr_metric = IP6_RT_PRIO_USER,
267 .accept_ra_from_local = 0,
268 .accept_ra_min_hop_limit= 1,
269 .accept_ra_min_lft = 0,
270 .accept_ra_pinfo = 1,
271#ifdef CONFIG_IPV6_ROUTER_PREF
272 .accept_ra_rtr_pref = 1,
273 .rtr_probe_interval = 60 * HZ,
274#ifdef CONFIG_IPV6_ROUTE_INFO
275 .accept_ra_rt_info_min_plen = 0,
276 .accept_ra_rt_info_max_plen = 0,
277#endif
278#endif
279 .proxy_ndp = 0,
280 .accept_source_route = 0, /* we do not accept RH0 by default. */
281 .disable_ipv6 = 0,
282 .accept_dad = 1,
283 .suppress_frag_ndisc = 1,
284 .accept_ra_mtu = 1,
285 .stable_secret = {
286 .initialized = false,
287 },
288 .use_oif_addrs_only = 0,
289 .ignore_routes_with_linkdown = 0,
290 .keep_addr_on_down = 0,
291 .seg6_enabled = 0,
292#ifdef CONFIG_IPV6_SEG6_HMAC
293 .seg6_require_hmac = 0,
294#endif
295 .enhanced_dad = 1,
296 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
297 .disable_policy = 0,
298 .rpl_seg_enabled = 0,
299 .ioam6_enabled = 0,
300 .ioam6_id = IOAM6_DEFAULT_IF_ID,
301 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
302 .ndisc_evict_nocarrier = 1,
303 .ra_honor_pio_life = 0,
304 .ra_honor_pio_pflag = 0,
305};
306
307/* Check if link is ready: is it up and is a valid qdisc available */
308static inline bool addrconf_link_ready(const struct net_device *dev)
309{
310 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
311}
312
313static void addrconf_del_rs_timer(struct inet6_dev *idev)
314{
315 if (del_timer(&idev->rs_timer))
316 __in6_dev_put(idev);
317}
318
319static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
320{
321 if (cancel_delayed_work(&ifp->dad_work))
322 __in6_ifa_put(ifp);
323}
324
325static void addrconf_mod_rs_timer(struct inet6_dev *idev,
326 unsigned long when)
327{
328 if (!mod_timer(&idev->rs_timer, jiffies + when))
329 in6_dev_hold(idev);
330}
331
332static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
333 unsigned long delay)
334{
335 in6_ifa_hold(ifp);
336 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
337 in6_ifa_put(ifp);
338}
339
340static int snmp6_alloc_dev(struct inet6_dev *idev)
341{
342 int i;
343
344 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT);
345 if (!idev->stats.ipv6)
346 goto err_ip;
347
348 for_each_possible_cpu(i) {
349 struct ipstats_mib *addrconf_stats;
350 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
351 u64_stats_init(&addrconf_stats->syncp);
352 }
353
354
355 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
356 GFP_KERNEL);
357 if (!idev->stats.icmpv6dev)
358 goto err_icmp;
359 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
360 GFP_KERNEL_ACCOUNT);
361 if (!idev->stats.icmpv6msgdev)
362 goto err_icmpmsg;
363
364 return 0;
365
366err_icmpmsg:
367 kfree(idev->stats.icmpv6dev);
368err_icmp:
369 free_percpu(idev->stats.ipv6);
370err_ip:
371 return -ENOMEM;
372}
373
374static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
375{
376 struct inet6_dev *ndev;
377 int err = -ENOMEM;
378
379 ASSERT_RTNL();
380
381 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev)
382 return ERR_PTR(-EINVAL);
383
384 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT);
385 if (!ndev)
386 return ERR_PTR(err);
387
388 rwlock_init(&ndev->lock);
389 ndev->dev = dev;
390 INIT_LIST_HEAD(&ndev->addr_list);
391 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
392 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
393
394 if (ndev->cnf.stable_secret.initialized)
395 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
396
397 ndev->cnf.mtu6 = dev->mtu;
398 ndev->ra_mtu = 0;
399 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
400 if (!ndev->nd_parms) {
401 kfree(ndev);
402 return ERR_PTR(err);
403 }
404 if (ndev->cnf.forwarding)
405 dev_disable_lro(dev);
406 /* We refer to the device */
407 netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL);
408
409 if (snmp6_alloc_dev(ndev) < 0) {
410 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
411 __func__);
412 neigh_parms_release(&nd_tbl, ndev->nd_parms);
413 netdev_put(dev, &ndev->dev_tracker);
414 kfree(ndev);
415 return ERR_PTR(err);
416 }
417
418 if (dev != blackhole_netdev) {
419 if (snmp6_register_dev(ndev) < 0) {
420 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
421 __func__, dev->name);
422 goto err_release;
423 }
424 }
425 /* One reference from device. */
426 refcount_set(&ndev->refcnt, 1);
427
428 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
429 ndev->cnf.accept_dad = -1;
430
431#if IS_ENABLED(CONFIG_IPV6_SIT)
432 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
433 pr_info("%s: Disabled Multicast RS\n", dev->name);
434 ndev->cnf.rtr_solicits = 0;
435 }
436#endif
437
438 INIT_LIST_HEAD(&ndev->tempaddr_list);
439 ndev->desync_factor = U32_MAX;
440 if ((dev->flags&IFF_LOOPBACK) ||
441 dev->type == ARPHRD_TUNNEL ||
442 dev->type == ARPHRD_TUNNEL6 ||
443 dev->type == ARPHRD_SIT ||
444 dev->type == ARPHRD_NONE) {
445 ndev->cnf.use_tempaddr = -1;
446 }
447
448 ndev->token = in6addr_any;
449
450 if (netif_running(dev) && addrconf_link_ready(dev))
451 ndev->if_flags |= IF_READY;
452
453 ipv6_mc_init_dev(ndev);
454 ndev->tstamp = jiffies;
455 if (dev != blackhole_netdev) {
456 err = addrconf_sysctl_register(ndev);
457 if (err) {
458 ipv6_mc_destroy_dev(ndev);
459 snmp6_unregister_dev(ndev);
460 goto err_release;
461 }
462 }
463 /* protected by rtnl_lock */
464 rcu_assign_pointer(dev->ip6_ptr, ndev);
465
466 if (dev != blackhole_netdev) {
467 /* Join interface-local all-node multicast group */
468 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
469
470 /* Join all-node multicast group */
471 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
472
473 /* Join all-router multicast group if forwarding is set */
474 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
475 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
476 }
477 return ndev;
478
479err_release:
480 neigh_parms_release(&nd_tbl, ndev->nd_parms);
481 ndev->dead = 1;
482 in6_dev_finish_destroy(ndev);
483 return ERR_PTR(err);
484}
485
486static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
487{
488 struct inet6_dev *idev;
489
490 ASSERT_RTNL();
491
492 idev = __in6_dev_get(dev);
493 if (!idev) {
494 idev = ipv6_add_dev(dev);
495 if (IS_ERR(idev))
496 return idev;
497 }
498
499 if (dev->flags&IFF_UP)
500 ipv6_mc_up(idev);
501 return idev;
502}
503
504static int inet6_netconf_msgsize_devconf(int type)
505{
506 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
507 + nla_total_size(4); /* NETCONFA_IFINDEX */
508 bool all = false;
509
510 if (type == NETCONFA_ALL)
511 all = true;
512
513 if (all || type == NETCONFA_FORWARDING)
514 size += nla_total_size(4);
515#ifdef CONFIG_IPV6_MROUTE
516 if (all || type == NETCONFA_MC_FORWARDING)
517 size += nla_total_size(4);
518#endif
519 if (all || type == NETCONFA_PROXY_NEIGH)
520 size += nla_total_size(4);
521
522 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
523 size += nla_total_size(4);
524
525 return size;
526}
527
528static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
529 struct ipv6_devconf *devconf, u32 portid,
530 u32 seq, int event, unsigned int flags,
531 int type)
532{
533 struct nlmsghdr *nlh;
534 struct netconfmsg *ncm;
535 bool all = false;
536
537 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
538 flags);
539 if (!nlh)
540 return -EMSGSIZE;
541
542 if (type == NETCONFA_ALL)
543 all = true;
544
545 ncm = nlmsg_data(nlh);
546 ncm->ncm_family = AF_INET6;
547
548 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
549 goto nla_put_failure;
550
551 if (!devconf)
552 goto out;
553
554 if ((all || type == NETCONFA_FORWARDING) &&
555 nla_put_s32(skb, NETCONFA_FORWARDING,
556 READ_ONCE(devconf->forwarding)) < 0)
557 goto nla_put_failure;
558#ifdef CONFIG_IPV6_MROUTE
559 if ((all || type == NETCONFA_MC_FORWARDING) &&
560 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
561 atomic_read(&devconf->mc_forwarding)) < 0)
562 goto nla_put_failure;
563#endif
564 if ((all || type == NETCONFA_PROXY_NEIGH) &&
565 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
566 READ_ONCE(devconf->proxy_ndp)) < 0)
567 goto nla_put_failure;
568
569 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
570 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
571 READ_ONCE(devconf->ignore_routes_with_linkdown)) < 0)
572 goto nla_put_failure;
573
574out:
575 nlmsg_end(skb, nlh);
576 return 0;
577
578nla_put_failure:
579 nlmsg_cancel(skb, nlh);
580 return -EMSGSIZE;
581}
582
583void inet6_netconf_notify_devconf(struct net *net, int event, int type,
584 int ifindex, struct ipv6_devconf *devconf)
585{
586 struct sk_buff *skb;
587 int err = -ENOBUFS;
588
589 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
590 if (!skb)
591 goto errout;
592
593 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
594 event, 0, type);
595 if (err < 0) {
596 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
597 WARN_ON(err == -EMSGSIZE);
598 kfree_skb(skb);
599 goto errout;
600 }
601 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
602 return;
603errout:
604 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
605}
606
607static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
608 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
609 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
610 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
611 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
612};
613
614static int inet6_netconf_valid_get_req(struct sk_buff *skb,
615 const struct nlmsghdr *nlh,
616 struct nlattr **tb,
617 struct netlink_ext_ack *extack)
618{
619 int i, err;
620
621 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
622 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
623 return -EINVAL;
624 }
625
626 if (!netlink_strict_get_check(skb))
627 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
628 tb, NETCONFA_MAX,
629 devconf_ipv6_policy, extack);
630
631 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
632 tb, NETCONFA_MAX,
633 devconf_ipv6_policy, extack);
634 if (err)
635 return err;
636
637 for (i = 0; i <= NETCONFA_MAX; i++) {
638 if (!tb[i])
639 continue;
640
641 switch (i) {
642 case NETCONFA_IFINDEX:
643 break;
644 default:
645 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
646 return -EINVAL;
647 }
648 }
649
650 return 0;
651}
652
653static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
654 struct nlmsghdr *nlh,
655 struct netlink_ext_ack *extack)
656{
657 struct net *net = sock_net(in_skb->sk);
658 struct nlattr *tb[NETCONFA_MAX+1];
659 struct inet6_dev *in6_dev = NULL;
660 struct net_device *dev = NULL;
661 struct sk_buff *skb;
662 struct ipv6_devconf *devconf;
663 int ifindex;
664 int err;
665
666 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
667 if (err < 0)
668 return err;
669
670 if (!tb[NETCONFA_IFINDEX])
671 return -EINVAL;
672
673 err = -EINVAL;
674 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
675 switch (ifindex) {
676 case NETCONFA_IFINDEX_ALL:
677 devconf = net->ipv6.devconf_all;
678 break;
679 case NETCONFA_IFINDEX_DEFAULT:
680 devconf = net->ipv6.devconf_dflt;
681 break;
682 default:
683 dev = dev_get_by_index(net, ifindex);
684 if (!dev)
685 return -EINVAL;
686 in6_dev = in6_dev_get(dev);
687 if (!in6_dev)
688 goto errout;
689 devconf = &in6_dev->cnf;
690 break;
691 }
692
693 err = -ENOBUFS;
694 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
695 if (!skb)
696 goto errout;
697
698 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
699 NETLINK_CB(in_skb).portid,
700 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
701 NETCONFA_ALL);
702 if (err < 0) {
703 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
704 WARN_ON(err == -EMSGSIZE);
705 kfree_skb(skb);
706 goto errout;
707 }
708 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
709errout:
710 if (in6_dev)
711 in6_dev_put(in6_dev);
712 dev_put(dev);
713 return err;
714}
715
716/* Combine dev_addr_genid and dev_base_seq to detect changes.
717 */
718static u32 inet6_base_seq(const struct net *net)
719{
720 u32 res = atomic_read(&net->ipv6.dev_addr_genid) +
721 READ_ONCE(net->dev_base_seq);
722
723 /* Must not return 0 (see nl_dump_check_consistent()).
724 * Chose a value far away from 0.
725 */
726 if (!res)
727 res = 0x80000000;
728 return res;
729}
730
731static int inet6_netconf_dump_devconf(struct sk_buff *skb,
732 struct netlink_callback *cb)
733{
734 const struct nlmsghdr *nlh = cb->nlh;
735 struct net *net = sock_net(skb->sk);
736 struct {
737 unsigned long ifindex;
738 unsigned int all_default;
739 } *ctx = (void *)cb->ctx;
740 struct net_device *dev;
741 struct inet6_dev *idev;
742 int err = 0;
743
744 if (cb->strict_check) {
745 struct netlink_ext_ack *extack = cb->extack;
746 struct netconfmsg *ncm;
747
748 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
749 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
750 return -EINVAL;
751 }
752
753 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
754 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
755 return -EINVAL;
756 }
757 }
758
759 rcu_read_lock();
760 for_each_netdev_dump(net, dev, ctx->ifindex) {
761 idev = __in6_dev_get(dev);
762 if (!idev)
763 continue;
764 err = inet6_netconf_fill_devconf(skb, dev->ifindex,
765 &idev->cnf,
766 NETLINK_CB(cb->skb).portid,
767 nlh->nlmsg_seq,
768 RTM_NEWNETCONF,
769 NLM_F_MULTI,
770 NETCONFA_ALL);
771 if (err < 0)
772 goto done;
773 }
774 if (ctx->all_default == 0) {
775 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
776 net->ipv6.devconf_all,
777 NETLINK_CB(cb->skb).portid,
778 nlh->nlmsg_seq,
779 RTM_NEWNETCONF, NLM_F_MULTI,
780 NETCONFA_ALL);
781 if (err < 0)
782 goto done;
783 ctx->all_default++;
784 }
785 if (ctx->all_default == 1) {
786 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
787 net->ipv6.devconf_dflt,
788 NETLINK_CB(cb->skb).portid,
789 nlh->nlmsg_seq,
790 RTM_NEWNETCONF, NLM_F_MULTI,
791 NETCONFA_ALL);
792 if (err < 0)
793 goto done;
794 ctx->all_default++;
795 }
796done:
797 rcu_read_unlock();
798 return err;
799}
800
801#ifdef CONFIG_SYSCTL
802static void dev_forward_change(struct inet6_dev *idev)
803{
804 struct net_device *dev;
805 struct inet6_ifaddr *ifa;
806 LIST_HEAD(tmp_addr_list);
807
808 if (!idev)
809 return;
810 dev = idev->dev;
811 if (idev->cnf.forwarding)
812 dev_disable_lro(dev);
813 if (dev->flags & IFF_MULTICAST) {
814 if (idev->cnf.forwarding) {
815 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
816 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
817 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
818 } else {
819 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
820 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
821 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
822 }
823 }
824
825 read_lock_bh(&idev->lock);
826 list_for_each_entry(ifa, &idev->addr_list, if_list) {
827 if (ifa->flags&IFA_F_TENTATIVE)
828 continue;
829 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
830 }
831 read_unlock_bh(&idev->lock);
832
833 while (!list_empty(&tmp_addr_list)) {
834 ifa = list_first_entry(&tmp_addr_list,
835 struct inet6_ifaddr, if_list_aux);
836 list_del(&ifa->if_list_aux);
837 if (idev->cnf.forwarding)
838 addrconf_join_anycast(ifa);
839 else
840 addrconf_leave_anycast(ifa);
841 }
842
843 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
844 NETCONFA_FORWARDING,
845 dev->ifindex, &idev->cnf);
846}
847
848
849static void addrconf_forward_change(struct net *net, __s32 newf)
850{
851 struct net_device *dev;
852 struct inet6_dev *idev;
853
854 for_each_netdev(net, dev) {
855 idev = __in6_dev_get(dev);
856 if (idev) {
857 int changed = (!idev->cnf.forwarding) ^ (!newf);
858
859 WRITE_ONCE(idev->cnf.forwarding, newf);
860 if (changed)
861 dev_forward_change(idev);
862 }
863 }
864}
865
866static int addrconf_fixup_forwarding(const struct ctl_table *table, int *p, int newf)
867{
868 struct net *net;
869 int old;
870
871 if (!rtnl_trylock())
872 return restart_syscall();
873
874 net = (struct net *)table->extra2;
875 old = *p;
876 WRITE_ONCE(*p, newf);
877
878 if (p == &net->ipv6.devconf_dflt->forwarding) {
879 if ((!newf) ^ (!old))
880 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
881 NETCONFA_FORWARDING,
882 NETCONFA_IFINDEX_DEFAULT,
883 net->ipv6.devconf_dflt);
884 rtnl_unlock();
885 return 0;
886 }
887
888 if (p == &net->ipv6.devconf_all->forwarding) {
889 int old_dflt = net->ipv6.devconf_dflt->forwarding;
890
891 WRITE_ONCE(net->ipv6.devconf_dflt->forwarding, newf);
892 if ((!newf) ^ (!old_dflt))
893 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
894 NETCONFA_FORWARDING,
895 NETCONFA_IFINDEX_DEFAULT,
896 net->ipv6.devconf_dflt);
897
898 addrconf_forward_change(net, newf);
899 if ((!newf) ^ (!old))
900 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
901 NETCONFA_FORWARDING,
902 NETCONFA_IFINDEX_ALL,
903 net->ipv6.devconf_all);
904 } else if ((!newf) ^ (!old))
905 dev_forward_change((struct inet6_dev *)table->extra1);
906 rtnl_unlock();
907
908 if (newf)
909 rt6_purge_dflt_routers(net);
910 return 1;
911}
912
913static void addrconf_linkdown_change(struct net *net, __s32 newf)
914{
915 struct net_device *dev;
916 struct inet6_dev *idev;
917
918 for_each_netdev(net, dev) {
919 idev = __in6_dev_get(dev);
920 if (idev) {
921 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
922
923 WRITE_ONCE(idev->cnf.ignore_routes_with_linkdown, newf);
924 if (changed)
925 inet6_netconf_notify_devconf(dev_net(dev),
926 RTM_NEWNETCONF,
927 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
928 dev->ifindex,
929 &idev->cnf);
930 }
931 }
932}
933
934static int addrconf_fixup_linkdown(const struct ctl_table *table, int *p, int newf)
935{
936 struct net *net;
937 int old;
938
939 if (!rtnl_trylock())
940 return restart_syscall();
941
942 net = (struct net *)table->extra2;
943 old = *p;
944 WRITE_ONCE(*p, newf);
945
946 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
947 if ((!newf) ^ (!old))
948 inet6_netconf_notify_devconf(net,
949 RTM_NEWNETCONF,
950 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
951 NETCONFA_IFINDEX_DEFAULT,
952 net->ipv6.devconf_dflt);
953 rtnl_unlock();
954 return 0;
955 }
956
957 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
958 WRITE_ONCE(net->ipv6.devconf_dflt->ignore_routes_with_linkdown, newf);
959 addrconf_linkdown_change(net, newf);
960 if ((!newf) ^ (!old))
961 inet6_netconf_notify_devconf(net,
962 RTM_NEWNETCONF,
963 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
964 NETCONFA_IFINDEX_ALL,
965 net->ipv6.devconf_all);
966 }
967 rtnl_unlock();
968
969 return 1;
970}
971
972#endif
973
974/* Nobody refers to this ifaddr, destroy it */
975void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
976{
977 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
978
979#ifdef NET_REFCNT_DEBUG
980 pr_debug("%s\n", __func__);
981#endif
982
983 in6_dev_put(ifp->idev);
984
985 if (cancel_delayed_work(&ifp->dad_work))
986 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
987 ifp);
988
989 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
990 pr_warn("Freeing alive inet6 address %p\n", ifp);
991 return;
992 }
993
994 kfree_rcu(ifp, rcu);
995}
996
997static void
998ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
999{
1000 struct list_head *p;
1001 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
1002
1003 /*
1004 * Each device address list is sorted in order of scope -
1005 * global before linklocal.
1006 */
1007 list_for_each(p, &idev->addr_list) {
1008 struct inet6_ifaddr *ifa
1009 = list_entry(p, struct inet6_ifaddr, if_list);
1010 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
1011 break;
1012 }
1013
1014 list_add_tail_rcu(&ifp->if_list, p);
1015}
1016
1017static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
1018{
1019 u32 val = __ipv6_addr_jhash(addr, net_hash_mix(net));
1020
1021 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1022}
1023
1024static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1025 struct net_device *dev, unsigned int hash)
1026{
1027 struct inet6_ifaddr *ifp;
1028
1029 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1030 if (ipv6_addr_equal(&ifp->addr, addr)) {
1031 if (!dev || ifp->idev->dev == dev)
1032 return true;
1033 }
1034 }
1035 return false;
1036}
1037
1038static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1039{
1040 struct net *net = dev_net(dev);
1041 unsigned int hash = inet6_addr_hash(net, &ifa->addr);
1042 int err = 0;
1043
1044 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1045
1046 /* Ignore adding duplicate addresses on an interface */
1047 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) {
1048 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1049 err = -EEXIST;
1050 } else {
1051 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]);
1052 }
1053
1054 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1055
1056 return err;
1057}
1058
1059/* On success it returns ifp with increased reference count */
1060
1061static struct inet6_ifaddr *
1062ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1063 bool can_block, struct netlink_ext_ack *extack)
1064{
1065 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1066 int addr_type = ipv6_addr_type(cfg->pfx);
1067 struct net *net = dev_net(idev->dev);
1068 struct inet6_ifaddr *ifa = NULL;
1069 struct fib6_info *f6i = NULL;
1070 int err = 0;
1071
1072 if (addr_type == IPV6_ADDR_ANY) {
1073 NL_SET_ERR_MSG_MOD(extack, "Invalid address");
1074 return ERR_PTR(-EADDRNOTAVAIL);
1075 } else if (addr_type & IPV6_ADDR_MULTICAST &&
1076 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) {
1077 NL_SET_ERR_MSG_MOD(extack, "Cannot assign multicast address without \"IFA_F_MCAUTOJOIN\" flag");
1078 return ERR_PTR(-EADDRNOTAVAIL);
1079 } else if (!(idev->dev->flags & IFF_LOOPBACK) &&
1080 !netif_is_l3_master(idev->dev) &&
1081 addr_type & IPV6_ADDR_LOOPBACK) {
1082 NL_SET_ERR_MSG_MOD(extack, "Cannot assign loopback address on this device");
1083 return ERR_PTR(-EADDRNOTAVAIL);
1084 }
1085
1086 if (idev->dead) {
1087 NL_SET_ERR_MSG_MOD(extack, "device is going away");
1088 err = -ENODEV;
1089 goto out;
1090 }
1091
1092 if (idev->cnf.disable_ipv6) {
1093 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
1094 err = -EACCES;
1095 goto out;
1096 }
1097
1098 /* validator notifier needs to be blocking;
1099 * do not call in atomic context
1100 */
1101 if (can_block) {
1102 struct in6_validator_info i6vi = {
1103 .i6vi_addr = *cfg->pfx,
1104 .i6vi_dev = idev,
1105 .extack = extack,
1106 };
1107
1108 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1109 err = notifier_to_errno(err);
1110 if (err < 0)
1111 goto out;
1112 }
1113
1114 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT);
1115 if (!ifa) {
1116 err = -ENOBUFS;
1117 goto out;
1118 }
1119
1120 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags, extack);
1121 if (IS_ERR(f6i)) {
1122 err = PTR_ERR(f6i);
1123 f6i = NULL;
1124 goto out;
1125 }
1126
1127 neigh_parms_data_state_setall(idev->nd_parms);
1128
1129 ifa->addr = *cfg->pfx;
1130 if (cfg->peer_pfx)
1131 ifa->peer_addr = *cfg->peer_pfx;
1132
1133 spin_lock_init(&ifa->lock);
1134 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1135 INIT_HLIST_NODE(&ifa->addr_lst);
1136 ifa->scope = cfg->scope;
1137 ifa->prefix_len = cfg->plen;
1138 ifa->rt_priority = cfg->rt_priority;
1139 ifa->flags = cfg->ifa_flags;
1140 ifa->ifa_proto = cfg->ifa_proto;
1141 /* No need to add the TENTATIVE flag for addresses with NODAD */
1142 if (!(cfg->ifa_flags & IFA_F_NODAD))
1143 ifa->flags |= IFA_F_TENTATIVE;
1144 ifa->valid_lft = cfg->valid_lft;
1145 ifa->prefered_lft = cfg->preferred_lft;
1146 ifa->cstamp = ifa->tstamp = jiffies;
1147 ifa->tokenized = false;
1148
1149 ifa->rt = f6i;
1150
1151 ifa->idev = idev;
1152 in6_dev_hold(idev);
1153
1154 /* For caller */
1155 refcount_set(&ifa->refcnt, 1);
1156
1157 rcu_read_lock();
1158
1159 err = ipv6_add_addr_hash(idev->dev, ifa);
1160 if (err < 0) {
1161 rcu_read_unlock();
1162 goto out;
1163 }
1164
1165 write_lock_bh(&idev->lock);
1166
1167 /* Add to inet6_dev unicast addr list. */
1168 ipv6_link_dev_addr(idev, ifa);
1169
1170 if (ifa->flags&IFA_F_TEMPORARY) {
1171 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1172 in6_ifa_hold(ifa);
1173 }
1174
1175 in6_ifa_hold(ifa);
1176 write_unlock_bh(&idev->lock);
1177
1178 rcu_read_unlock();
1179
1180 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1181out:
1182 if (unlikely(err < 0)) {
1183 fib6_info_release(f6i);
1184
1185 if (ifa) {
1186 if (ifa->idev)
1187 in6_dev_put(ifa->idev);
1188 kfree(ifa);
1189 }
1190 ifa = ERR_PTR(err);
1191 }
1192
1193 return ifa;
1194}
1195
1196enum cleanup_prefix_rt_t {
1197 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1198 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1199 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1200};
1201
1202/*
1203 * Check, whether the prefix for ifp would still need a prefix route
1204 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1205 * constants.
1206 *
1207 * 1) we don't purge prefix if address was not permanent.
1208 * prefix is managed by its own lifetime.
1209 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1210 * 3) if there are no addresses, delete prefix.
1211 * 4) if there are still other permanent address(es),
1212 * corresponding prefix is still permanent.
1213 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1214 * don't purge the prefix, assume user space is managing it.
1215 * 6) otherwise, update prefix lifetime to the
1216 * longest valid lifetime among the corresponding
1217 * addresses on the device.
1218 * Note: subsequent RA will update lifetime.
1219 **/
1220static enum cleanup_prefix_rt_t
1221check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1222{
1223 struct inet6_ifaddr *ifa;
1224 struct inet6_dev *idev = ifp->idev;
1225 unsigned long lifetime;
1226 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1227
1228 *expires = jiffies;
1229
1230 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1231 if (ifa == ifp)
1232 continue;
1233 if (ifa->prefix_len != ifp->prefix_len ||
1234 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1235 ifp->prefix_len))
1236 continue;
1237 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1238 return CLEANUP_PREFIX_RT_NOP;
1239
1240 action = CLEANUP_PREFIX_RT_EXPIRE;
1241
1242 spin_lock(&ifa->lock);
1243
1244 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1245 /*
1246 * Note: Because this address is
1247 * not permanent, lifetime <
1248 * LONG_MAX / HZ here.
1249 */
1250 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1251 *expires = ifa->tstamp + lifetime * HZ;
1252 spin_unlock(&ifa->lock);
1253 }
1254
1255 return action;
1256}
1257
1258static void
1259cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1260 bool del_rt, bool del_peer)
1261{
1262 struct fib6_table *table;
1263 struct fib6_info *f6i;
1264
1265 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1266 ifp->prefix_len,
1267 ifp->idev->dev, 0, RTF_DEFAULT, true);
1268 if (f6i) {
1269 if (del_rt)
1270 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1271 else {
1272 if (!(f6i->fib6_flags & RTF_EXPIRES)) {
1273 table = f6i->fib6_table;
1274 spin_lock_bh(&table->tb6_lock);
1275
1276 fib6_set_expires(f6i, expires);
1277 fib6_add_gc_list(f6i);
1278
1279 spin_unlock_bh(&table->tb6_lock);
1280 }
1281 fib6_info_release(f6i);
1282 }
1283 }
1284}
1285
1286
1287/* This function wants to get referenced ifp and releases it before return */
1288
1289static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1290{
1291 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1292 struct net *net = dev_net(ifp->idev->dev);
1293 unsigned long expires;
1294 int state;
1295
1296 ASSERT_RTNL();
1297
1298 spin_lock_bh(&ifp->lock);
1299 state = ifp->state;
1300 ifp->state = INET6_IFADDR_STATE_DEAD;
1301 spin_unlock_bh(&ifp->lock);
1302
1303 if (state == INET6_IFADDR_STATE_DEAD)
1304 goto out;
1305
1306 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1307 hlist_del_init_rcu(&ifp->addr_lst);
1308 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1309
1310 write_lock_bh(&ifp->idev->lock);
1311
1312 if (ifp->flags&IFA_F_TEMPORARY) {
1313 list_del(&ifp->tmp_list);
1314 if (ifp->ifpub) {
1315 in6_ifa_put(ifp->ifpub);
1316 ifp->ifpub = NULL;
1317 }
1318 __in6_ifa_put(ifp);
1319 }
1320
1321 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1322 action = check_cleanup_prefix_route(ifp, &expires);
1323
1324 list_del_rcu(&ifp->if_list);
1325 __in6_ifa_put(ifp);
1326
1327 write_unlock_bh(&ifp->idev->lock);
1328
1329 addrconf_del_dad_work(ifp);
1330
1331 ipv6_ifa_notify(RTM_DELADDR, ifp);
1332
1333 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1334
1335 if (action != CLEANUP_PREFIX_RT_NOP) {
1336 cleanup_prefix_route(ifp, expires,
1337 action == CLEANUP_PREFIX_RT_DEL, false);
1338 }
1339
1340 /* clean up prefsrc entries */
1341 rt6_remove_prefsrc(ifp);
1342out:
1343 in6_ifa_put(ifp);
1344}
1345
1346static unsigned long ipv6_get_regen_advance(const struct inet6_dev *idev)
1347{
1348 return READ_ONCE(idev->cnf.regen_min_advance) +
1349 READ_ONCE(idev->cnf.regen_max_retry) *
1350 READ_ONCE(idev->cnf.dad_transmits) *
1351 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1352}
1353
1354static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1355{
1356 struct inet6_dev *idev = ifp->idev;
1357 unsigned long tmp_tstamp, age;
1358 unsigned long regen_advance;
1359 unsigned long now = jiffies;
1360 u32 if_public_preferred_lft;
1361 s32 cnf_temp_preferred_lft;
1362 struct inet6_ifaddr *ift;
1363 struct ifa6_config cfg;
1364 long max_desync_factor;
1365 struct in6_addr addr;
1366 int ret = 0;
1367
1368 write_lock_bh(&idev->lock);
1369
1370retry:
1371 in6_dev_hold(idev);
1372 if (READ_ONCE(idev->cnf.use_tempaddr) <= 0) {
1373 write_unlock_bh(&idev->lock);
1374 pr_info("%s: use_tempaddr is disabled\n", __func__);
1375 in6_dev_put(idev);
1376 ret = -1;
1377 goto out;
1378 }
1379 spin_lock_bh(&ifp->lock);
1380 if (ifp->regen_count++ >= READ_ONCE(idev->cnf.regen_max_retry)) {
1381 WRITE_ONCE(idev->cnf.use_tempaddr, -1); /*XXX*/
1382 spin_unlock_bh(&ifp->lock);
1383 write_unlock_bh(&idev->lock);
1384 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1385 __func__);
1386 in6_dev_put(idev);
1387 ret = -1;
1388 goto out;
1389 }
1390 in6_ifa_hold(ifp);
1391 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1392 ipv6_gen_rnd_iid(&addr);
1393
1394 age = (now - ifp->tstamp) / HZ;
1395
1396 regen_advance = ipv6_get_regen_advance(idev);
1397
1398 /* recalculate max_desync_factor each time and update
1399 * idev->desync_factor if it's larger
1400 */
1401 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1402 max_desync_factor = min_t(long,
1403 READ_ONCE(idev->cnf.max_desync_factor),
1404 cnf_temp_preferred_lft - regen_advance);
1405
1406 if (unlikely(idev->desync_factor > max_desync_factor)) {
1407 if (max_desync_factor > 0) {
1408 get_random_bytes(&idev->desync_factor,
1409 sizeof(idev->desync_factor));
1410 idev->desync_factor %= max_desync_factor;
1411 } else {
1412 idev->desync_factor = 0;
1413 }
1414 }
1415
1416 if_public_preferred_lft = ifp->prefered_lft;
1417
1418 memset(&cfg, 0, sizeof(cfg));
1419 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1420 READ_ONCE(idev->cnf.temp_valid_lft) + age);
1421 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1422 cfg.preferred_lft = min_t(__u32, if_public_preferred_lft, cfg.preferred_lft);
1423 cfg.preferred_lft = min_t(__u32, cfg.valid_lft, cfg.preferred_lft);
1424
1425 cfg.plen = ifp->prefix_len;
1426 tmp_tstamp = ifp->tstamp;
1427 spin_unlock_bh(&ifp->lock);
1428
1429 write_unlock_bh(&idev->lock);
1430
1431 /* From RFC 4941:
1432 *
1433 * A temporary address is created only if this calculated Preferred
1434 * Lifetime is greater than REGEN_ADVANCE time units. In
1435 * particular, an implementation must not create a temporary address
1436 * with a zero Preferred Lifetime.
1437 *
1438 * ...
1439 *
1440 * When creating a temporary address, the lifetime values MUST be
1441 * derived from the corresponding prefix as follows:
1442 *
1443 * ...
1444 *
1445 * * Its Preferred Lifetime is the lower of the Preferred Lifetime
1446 * of the public address or TEMP_PREFERRED_LIFETIME -
1447 * DESYNC_FACTOR.
1448 *
1449 * To comply with the RFC's requirements, clamp the preferred lifetime
1450 * to a minimum of regen_advance, unless that would exceed valid_lft or
1451 * ifp->prefered_lft.
1452 *
1453 * Use age calculation as in addrconf_verify to avoid unnecessary
1454 * temporary addresses being generated.
1455 */
1456 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1457 if (cfg.preferred_lft <= regen_advance + age) {
1458 cfg.preferred_lft = regen_advance + age + 1;
1459 if (cfg.preferred_lft > cfg.valid_lft ||
1460 cfg.preferred_lft > if_public_preferred_lft) {
1461 in6_ifa_put(ifp);
1462 in6_dev_put(idev);
1463 ret = -1;
1464 goto out;
1465 }
1466 }
1467
1468 cfg.ifa_flags = IFA_F_TEMPORARY;
1469 /* set in addrconf_prefix_rcv() */
1470 if (ifp->flags & IFA_F_OPTIMISTIC)
1471 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1472
1473 cfg.pfx = &addr;
1474 cfg.scope = ipv6_addr_scope(cfg.pfx);
1475
1476 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1477 if (IS_ERR(ift)) {
1478 in6_ifa_put(ifp);
1479 in6_dev_put(idev);
1480 pr_info("%s: retry temporary address regeneration\n", __func__);
1481 write_lock_bh(&idev->lock);
1482 goto retry;
1483 }
1484
1485 spin_lock_bh(&ift->lock);
1486 ift->ifpub = ifp;
1487 ift->cstamp = now;
1488 ift->tstamp = tmp_tstamp;
1489 spin_unlock_bh(&ift->lock);
1490
1491 addrconf_dad_start(ift);
1492 in6_ifa_put(ift);
1493 in6_dev_put(idev);
1494out:
1495 return ret;
1496}
1497
1498/*
1499 * Choose an appropriate source address (RFC3484)
1500 */
1501enum {
1502 IPV6_SADDR_RULE_INIT = 0,
1503 IPV6_SADDR_RULE_LOCAL,
1504 IPV6_SADDR_RULE_SCOPE,
1505 IPV6_SADDR_RULE_PREFERRED,
1506#ifdef CONFIG_IPV6_MIP6
1507 IPV6_SADDR_RULE_HOA,
1508#endif
1509 IPV6_SADDR_RULE_OIF,
1510 IPV6_SADDR_RULE_LABEL,
1511 IPV6_SADDR_RULE_PRIVACY,
1512 IPV6_SADDR_RULE_ORCHID,
1513 IPV6_SADDR_RULE_PREFIX,
1514#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1515 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1516#endif
1517 IPV6_SADDR_RULE_MAX
1518};
1519
1520struct ipv6_saddr_score {
1521 int rule;
1522 int addr_type;
1523 struct inet6_ifaddr *ifa;
1524 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1525 int scopedist;
1526 int matchlen;
1527};
1528
1529struct ipv6_saddr_dst {
1530 const struct in6_addr *addr;
1531 int ifindex;
1532 int scope;
1533 int label;
1534 unsigned int prefs;
1535};
1536
1537static inline int ipv6_saddr_preferred(int type)
1538{
1539 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1540 return 1;
1541 return 0;
1542}
1543
1544static bool ipv6_use_optimistic_addr(const struct net *net,
1545 const struct inet6_dev *idev)
1546{
1547#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1548 if (!idev)
1549 return false;
1550 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) &&
1551 !READ_ONCE(idev->cnf.optimistic_dad))
1552 return false;
1553 if (!READ_ONCE(net->ipv6.devconf_all->use_optimistic) &&
1554 !READ_ONCE(idev->cnf.use_optimistic))
1555 return false;
1556
1557 return true;
1558#else
1559 return false;
1560#endif
1561}
1562
1563static bool ipv6_allow_optimistic_dad(const struct net *net,
1564 const struct inet6_dev *idev)
1565{
1566#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1567 if (!idev)
1568 return false;
1569 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) &&
1570 !READ_ONCE(idev->cnf.optimistic_dad))
1571 return false;
1572
1573 return true;
1574#else
1575 return false;
1576#endif
1577}
1578
1579static int ipv6_get_saddr_eval(struct net *net,
1580 struct ipv6_saddr_score *score,
1581 struct ipv6_saddr_dst *dst,
1582 int i)
1583{
1584 int ret;
1585
1586 if (i <= score->rule) {
1587 switch (i) {
1588 case IPV6_SADDR_RULE_SCOPE:
1589 ret = score->scopedist;
1590 break;
1591 case IPV6_SADDR_RULE_PREFIX:
1592 ret = score->matchlen;
1593 break;
1594 default:
1595 ret = !!test_bit(i, score->scorebits);
1596 }
1597 goto out;
1598 }
1599
1600 switch (i) {
1601 case IPV6_SADDR_RULE_INIT:
1602 /* Rule 0: remember if hiscore is not ready yet */
1603 ret = !!score->ifa;
1604 break;
1605 case IPV6_SADDR_RULE_LOCAL:
1606 /* Rule 1: Prefer same address */
1607 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1608 break;
1609 case IPV6_SADDR_RULE_SCOPE:
1610 /* Rule 2: Prefer appropriate scope
1611 *
1612 * ret
1613 * ^
1614 * -1 | d 15
1615 * ---+--+-+---> scope
1616 * |
1617 * | d is scope of the destination.
1618 * B-d | \
1619 * | \ <- smaller scope is better if
1620 * B-15 | \ if scope is enough for destination.
1621 * | ret = B - scope (-1 <= scope >= d <= 15).
1622 * d-C-1 | /
1623 * |/ <- greater is better
1624 * -C / if scope is not enough for destination.
1625 * /| ret = scope - C (-1 <= d < scope <= 15).
1626 *
1627 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1628 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1629 * Assume B = 0 and we get C > 29.
1630 */
1631 ret = __ipv6_addr_src_scope(score->addr_type);
1632 if (ret >= dst->scope)
1633 ret = -ret;
1634 else
1635 ret -= 128; /* 30 is enough */
1636 score->scopedist = ret;
1637 break;
1638 case IPV6_SADDR_RULE_PREFERRED:
1639 {
1640 /* Rule 3: Avoid deprecated and optimistic addresses */
1641 u8 avoid = IFA_F_DEPRECATED;
1642
1643 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1644 avoid |= IFA_F_OPTIMISTIC;
1645 ret = ipv6_saddr_preferred(score->addr_type) ||
1646 !(score->ifa->flags & avoid);
1647 break;
1648 }
1649#ifdef CONFIG_IPV6_MIP6
1650 case IPV6_SADDR_RULE_HOA:
1651 {
1652 /* Rule 4: Prefer home address */
1653 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1654 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1655 break;
1656 }
1657#endif
1658 case IPV6_SADDR_RULE_OIF:
1659 /* Rule 5: Prefer outgoing interface */
1660 ret = (!dst->ifindex ||
1661 dst->ifindex == score->ifa->idev->dev->ifindex);
1662 break;
1663 case IPV6_SADDR_RULE_LABEL:
1664 /* Rule 6: Prefer matching label */
1665 ret = ipv6_addr_label(net,
1666 &score->ifa->addr, score->addr_type,
1667 score->ifa->idev->dev->ifindex) == dst->label;
1668 break;
1669 case IPV6_SADDR_RULE_PRIVACY:
1670 {
1671 /* Rule 7: Prefer public address
1672 * Note: prefer temporary address if use_tempaddr >= 2
1673 */
1674 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1675 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1676 READ_ONCE(score->ifa->idev->cnf.use_tempaddr) >= 2;
1677 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1678 break;
1679 }
1680 case IPV6_SADDR_RULE_ORCHID:
1681 /* Rule 8-: Prefer ORCHID vs ORCHID or
1682 * non-ORCHID vs non-ORCHID
1683 */
1684 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1685 ipv6_addr_orchid(dst->addr));
1686 break;
1687 case IPV6_SADDR_RULE_PREFIX:
1688 /* Rule 8: Use longest matching prefix */
1689 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1690 if (ret > score->ifa->prefix_len)
1691 ret = score->ifa->prefix_len;
1692 score->matchlen = ret;
1693 break;
1694#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1695 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1696 /* Optimistic addresses still have lower precedence than other
1697 * preferred addresses.
1698 */
1699 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1700 break;
1701#endif
1702 default:
1703 ret = 0;
1704 }
1705
1706 if (ret)
1707 __set_bit(i, score->scorebits);
1708 score->rule = i;
1709out:
1710 return ret;
1711}
1712
1713static int __ipv6_dev_get_saddr(struct net *net,
1714 struct ipv6_saddr_dst *dst,
1715 struct inet6_dev *idev,
1716 struct ipv6_saddr_score *scores,
1717 int hiscore_idx)
1718{
1719 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1720
1721 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1722 int i;
1723
1724 /*
1725 * - Tentative Address (RFC2462 section 5.4)
1726 * - A tentative address is not considered
1727 * "assigned to an interface" in the traditional
1728 * sense, unless it is also flagged as optimistic.
1729 * - Candidate Source Address (section 4)
1730 * - In any case, anycast addresses, multicast
1731 * addresses, and the unspecified address MUST
1732 * NOT be included in a candidate set.
1733 */
1734 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1735 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1736 continue;
1737
1738 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1739
1740 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1741 score->addr_type & IPV6_ADDR_MULTICAST)) {
1742 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1743 idev->dev->name);
1744 continue;
1745 }
1746
1747 score->rule = -1;
1748 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1749
1750 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1751 int minihiscore, miniscore;
1752
1753 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1754 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1755
1756 if (minihiscore > miniscore) {
1757 if (i == IPV6_SADDR_RULE_SCOPE &&
1758 score->scopedist > 0) {
1759 /*
1760 * special case:
1761 * each remaining entry
1762 * has too small (not enough)
1763 * scope, because ifa entries
1764 * are sorted by their scope
1765 * values.
1766 */
1767 goto out;
1768 }
1769 break;
1770 } else if (minihiscore < miniscore) {
1771 swap(hiscore, score);
1772 hiscore_idx = 1 - hiscore_idx;
1773
1774 /* restore our iterator */
1775 score->ifa = hiscore->ifa;
1776
1777 break;
1778 }
1779 }
1780 }
1781out:
1782 return hiscore_idx;
1783}
1784
1785static int ipv6_get_saddr_master(struct net *net,
1786 const struct net_device *dst_dev,
1787 const struct net_device *master,
1788 struct ipv6_saddr_dst *dst,
1789 struct ipv6_saddr_score *scores,
1790 int hiscore_idx)
1791{
1792 struct inet6_dev *idev;
1793
1794 idev = __in6_dev_get(dst_dev);
1795 if (idev)
1796 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1797 scores, hiscore_idx);
1798
1799 idev = __in6_dev_get(master);
1800 if (idev)
1801 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1802 scores, hiscore_idx);
1803
1804 return hiscore_idx;
1805}
1806
1807int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1808 const struct in6_addr *daddr, unsigned int prefs,
1809 struct in6_addr *saddr)
1810{
1811 struct ipv6_saddr_score scores[2], *hiscore;
1812 struct ipv6_saddr_dst dst;
1813 struct inet6_dev *idev;
1814 struct net_device *dev;
1815 int dst_type;
1816 bool use_oif_addr = false;
1817 int hiscore_idx = 0;
1818 int ret = 0;
1819
1820 dst_type = __ipv6_addr_type(daddr);
1821 dst.addr = daddr;
1822 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1823 dst.scope = __ipv6_addr_src_scope(dst_type);
1824 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1825 dst.prefs = prefs;
1826
1827 scores[hiscore_idx].rule = -1;
1828 scores[hiscore_idx].ifa = NULL;
1829
1830 rcu_read_lock();
1831
1832 /* Candidate Source Address (section 4)
1833 * - multicast and link-local destination address,
1834 * the set of candidate source address MUST only
1835 * include addresses assigned to interfaces
1836 * belonging to the same link as the outgoing
1837 * interface.
1838 * (- For site-local destination addresses, the
1839 * set of candidate source addresses MUST only
1840 * include addresses assigned to interfaces
1841 * belonging to the same site as the outgoing
1842 * interface.)
1843 * - "It is RECOMMENDED that the candidate source addresses
1844 * be the set of unicast addresses assigned to the
1845 * interface that will be used to send to the destination
1846 * (the 'outgoing' interface)." (RFC 6724)
1847 */
1848 if (dst_dev) {
1849 idev = __in6_dev_get(dst_dev);
1850 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1851 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1852 (idev && READ_ONCE(idev->cnf.use_oif_addrs_only))) {
1853 use_oif_addr = true;
1854 }
1855 }
1856
1857 if (use_oif_addr) {
1858 if (idev)
1859 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1860 } else {
1861 const struct net_device *master;
1862 int master_idx = 0;
1863
1864 /* if dst_dev exists and is enslaved to an L3 device, then
1865 * prefer addresses from dst_dev and then the master over
1866 * any other enslaved devices in the L3 domain.
1867 */
1868 master = l3mdev_master_dev_rcu(dst_dev);
1869 if (master) {
1870 master_idx = master->ifindex;
1871
1872 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1873 master, &dst,
1874 scores, hiscore_idx);
1875
1876 if (scores[hiscore_idx].ifa &&
1877 scores[hiscore_idx].scopedist >= 0)
1878 goto out;
1879 }
1880
1881 for_each_netdev_rcu(net, dev) {
1882 /* only consider addresses on devices in the
1883 * same L3 domain
1884 */
1885 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1886 continue;
1887 idev = __in6_dev_get(dev);
1888 if (!idev)
1889 continue;
1890 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1891 }
1892 }
1893
1894out:
1895 hiscore = &scores[hiscore_idx];
1896 if (!hiscore->ifa)
1897 ret = -EADDRNOTAVAIL;
1898 else
1899 *saddr = hiscore->ifa->addr;
1900
1901 rcu_read_unlock();
1902 return ret;
1903}
1904EXPORT_SYMBOL(ipv6_dev_get_saddr);
1905
1906static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1907 u32 banned_flags)
1908{
1909 struct inet6_ifaddr *ifp;
1910 int err = -EADDRNOTAVAIL;
1911
1912 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1913 if (ifp->scope > IFA_LINK)
1914 break;
1915 if (ifp->scope == IFA_LINK &&
1916 !(ifp->flags & banned_flags)) {
1917 *addr = ifp->addr;
1918 err = 0;
1919 break;
1920 }
1921 }
1922 return err;
1923}
1924
1925int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1926 u32 banned_flags)
1927{
1928 struct inet6_dev *idev;
1929 int err = -EADDRNOTAVAIL;
1930
1931 rcu_read_lock();
1932 idev = __in6_dev_get(dev);
1933 if (idev) {
1934 read_lock_bh(&idev->lock);
1935 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1936 read_unlock_bh(&idev->lock);
1937 }
1938 rcu_read_unlock();
1939 return err;
1940}
1941
1942static int ipv6_count_addresses(const struct inet6_dev *idev)
1943{
1944 const struct inet6_ifaddr *ifp;
1945 int cnt = 0;
1946
1947 rcu_read_lock();
1948 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1949 cnt++;
1950 rcu_read_unlock();
1951 return cnt;
1952}
1953
1954int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1955 const struct net_device *dev, int strict)
1956{
1957 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1958 strict, IFA_F_TENTATIVE);
1959}
1960EXPORT_SYMBOL(ipv6_chk_addr);
1961
1962/* device argument is used to find the L3 domain of interest. If
1963 * skip_dev_check is set, then the ifp device is not checked against
1964 * the passed in dev argument. So the 2 cases for addresses checks are:
1965 * 1. does the address exist in the L3 domain that dev is part of
1966 * (skip_dev_check = true), or
1967 *
1968 * 2. does the address exist on the specific device
1969 * (skip_dev_check = false)
1970 */
1971static struct net_device *
1972__ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1973 const struct net_device *dev, bool skip_dev_check,
1974 int strict, u32 banned_flags)
1975{
1976 unsigned int hash = inet6_addr_hash(net, addr);
1977 struct net_device *l3mdev, *ndev;
1978 struct inet6_ifaddr *ifp;
1979 u32 ifp_flags;
1980
1981 rcu_read_lock();
1982
1983 l3mdev = l3mdev_master_dev_rcu(dev);
1984 if (skip_dev_check)
1985 dev = NULL;
1986
1987 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1988 ndev = ifp->idev->dev;
1989
1990 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1991 continue;
1992
1993 /* Decouple optimistic from tentative for evaluation here.
1994 * Ban optimistic addresses explicitly, when required.
1995 */
1996 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1997 ? (ifp->flags&~IFA_F_TENTATIVE)
1998 : ifp->flags;
1999 if (ipv6_addr_equal(&ifp->addr, addr) &&
2000 !(ifp_flags&banned_flags) &&
2001 (!dev || ndev == dev ||
2002 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
2003 rcu_read_unlock();
2004 return ndev;
2005 }
2006 }
2007
2008 rcu_read_unlock();
2009 return NULL;
2010}
2011
2012int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
2013 const struct net_device *dev, bool skip_dev_check,
2014 int strict, u32 banned_flags)
2015{
2016 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
2017 strict, banned_flags) ? 1 : 0;
2018}
2019EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
2020
2021
2022/* Compares an address/prefix_len with addresses on device @dev.
2023 * If one is found it returns true.
2024 */
2025bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
2026 const unsigned int prefix_len, struct net_device *dev)
2027{
2028 const struct inet6_ifaddr *ifa;
2029 const struct inet6_dev *idev;
2030 bool ret = false;
2031
2032 rcu_read_lock();
2033 idev = __in6_dev_get(dev);
2034 if (idev) {
2035 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2036 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
2037 if (ret)
2038 break;
2039 }
2040 }
2041 rcu_read_unlock();
2042
2043 return ret;
2044}
2045EXPORT_SYMBOL(ipv6_chk_custom_prefix);
2046
2047int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
2048{
2049 const struct inet6_ifaddr *ifa;
2050 const struct inet6_dev *idev;
2051 int onlink;
2052
2053 onlink = 0;
2054 rcu_read_lock();
2055 idev = __in6_dev_get(dev);
2056 if (idev) {
2057 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2058 onlink = ipv6_prefix_equal(addr, &ifa->addr,
2059 ifa->prefix_len);
2060 if (onlink)
2061 break;
2062 }
2063 }
2064 rcu_read_unlock();
2065 return onlink;
2066}
2067EXPORT_SYMBOL(ipv6_chk_prefix);
2068
2069/**
2070 * ipv6_dev_find - find the first device with a given source address.
2071 * @net: the net namespace
2072 * @addr: the source address
2073 * @dev: used to find the L3 domain of interest
2074 *
2075 * The caller should be protected by RCU, or RTNL.
2076 */
2077struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2078 struct net_device *dev)
2079{
2080 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2081 IFA_F_TENTATIVE);
2082}
2083EXPORT_SYMBOL(ipv6_dev_find);
2084
2085struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2086 struct net_device *dev, int strict)
2087{
2088 unsigned int hash = inet6_addr_hash(net, addr);
2089 struct inet6_ifaddr *ifp, *result = NULL;
2090
2091 rcu_read_lock();
2092 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
2093 if (ipv6_addr_equal(&ifp->addr, addr)) {
2094 if (!dev || ifp->idev->dev == dev ||
2095 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2096 if (in6_ifa_hold_safe(ifp)) {
2097 result = ifp;
2098 break;
2099 }
2100 }
2101 }
2102 }
2103 rcu_read_unlock();
2104
2105 return result;
2106}
2107
2108/* Gets referenced address, destroys ifaddr */
2109
2110static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2111{
2112 if (dad_failed)
2113 ifp->flags |= IFA_F_DADFAILED;
2114
2115 if (ifp->flags&IFA_F_TEMPORARY) {
2116 struct inet6_ifaddr *ifpub;
2117 spin_lock_bh(&ifp->lock);
2118 ifpub = ifp->ifpub;
2119 if (ifpub) {
2120 in6_ifa_hold(ifpub);
2121 spin_unlock_bh(&ifp->lock);
2122 ipv6_create_tempaddr(ifpub, true);
2123 in6_ifa_put(ifpub);
2124 } else {
2125 spin_unlock_bh(&ifp->lock);
2126 }
2127 ipv6_del_addr(ifp);
2128 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2129 spin_lock_bh(&ifp->lock);
2130 addrconf_del_dad_work(ifp);
2131 ifp->flags |= IFA_F_TENTATIVE;
2132 if (dad_failed)
2133 ifp->flags &= ~IFA_F_OPTIMISTIC;
2134 spin_unlock_bh(&ifp->lock);
2135 if (dad_failed)
2136 ipv6_ifa_notify(0, ifp);
2137 in6_ifa_put(ifp);
2138 } else {
2139 ipv6_del_addr(ifp);
2140 }
2141}
2142
2143static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2144{
2145 int err = -ENOENT;
2146
2147 spin_lock_bh(&ifp->lock);
2148 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2149 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2150 err = 0;
2151 }
2152 spin_unlock_bh(&ifp->lock);
2153
2154 return err;
2155}
2156
2157void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2158{
2159 struct inet6_dev *idev = ifp->idev;
2160 struct net *net = dev_net(idev->dev);
2161 int max_addresses;
2162
2163 if (addrconf_dad_end(ifp)) {
2164 in6_ifa_put(ifp);
2165 return;
2166 }
2167
2168 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2169 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2170
2171 spin_lock_bh(&ifp->lock);
2172
2173 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2174 struct in6_addr new_addr;
2175 struct inet6_ifaddr *ifp2;
2176 int retries = ifp->stable_privacy_retry + 1;
2177 struct ifa6_config cfg = {
2178 .pfx = &new_addr,
2179 .plen = ifp->prefix_len,
2180 .ifa_flags = ifp->flags,
2181 .valid_lft = ifp->valid_lft,
2182 .preferred_lft = ifp->prefered_lft,
2183 .scope = ifp->scope,
2184 };
2185
2186 if (retries > net->ipv6.sysctl.idgen_retries) {
2187 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2188 ifp->idev->dev->name);
2189 goto errdad;
2190 }
2191
2192 new_addr = ifp->addr;
2193 if (ipv6_generate_stable_address(&new_addr, retries,
2194 idev))
2195 goto errdad;
2196
2197 spin_unlock_bh(&ifp->lock);
2198
2199 max_addresses = READ_ONCE(idev->cnf.max_addresses);
2200 if (max_addresses &&
2201 ipv6_count_addresses(idev) >= max_addresses)
2202 goto lock_errdad;
2203
2204 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2205 ifp->idev->dev->name);
2206
2207 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2208 if (IS_ERR(ifp2))
2209 goto lock_errdad;
2210
2211 spin_lock_bh(&ifp2->lock);
2212 ifp2->stable_privacy_retry = retries;
2213 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2214 spin_unlock_bh(&ifp2->lock);
2215
2216 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2217 in6_ifa_put(ifp2);
2218lock_errdad:
2219 spin_lock_bh(&ifp->lock);
2220 }
2221
2222errdad:
2223 /* transition from _POSTDAD to _ERRDAD */
2224 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2225 spin_unlock_bh(&ifp->lock);
2226
2227 addrconf_mod_dad_work(ifp, 0);
2228 in6_ifa_put(ifp);
2229}
2230
2231/* Join to solicited addr multicast group.
2232 * caller must hold RTNL */
2233void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2234{
2235 struct in6_addr maddr;
2236
2237 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2238 return;
2239
2240 addrconf_addr_solict_mult(addr, &maddr);
2241 ipv6_dev_mc_inc(dev, &maddr);
2242}
2243
2244/* caller must hold RTNL */
2245void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2246{
2247 struct in6_addr maddr;
2248
2249 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2250 return;
2251
2252 addrconf_addr_solict_mult(addr, &maddr);
2253 __ipv6_dev_mc_dec(idev, &maddr);
2254}
2255
2256/* caller must hold RTNL */
2257static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2258{
2259 struct in6_addr addr;
2260
2261 if (ifp->prefix_len >= 127) /* RFC 6164 */
2262 return;
2263 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2264 if (ipv6_addr_any(&addr))
2265 return;
2266 __ipv6_dev_ac_inc(ifp->idev, &addr);
2267}
2268
2269/* caller must hold RTNL */
2270static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2271{
2272 struct in6_addr addr;
2273
2274 if (ifp->prefix_len >= 127) /* RFC 6164 */
2275 return;
2276 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2277 if (ipv6_addr_any(&addr))
2278 return;
2279 __ipv6_dev_ac_dec(ifp->idev, &addr);
2280}
2281
2282static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2283{
2284 switch (dev->addr_len) {
2285 case ETH_ALEN:
2286 memcpy(eui, dev->dev_addr, 3);
2287 eui[3] = 0xFF;
2288 eui[4] = 0xFE;
2289 memcpy(eui + 5, dev->dev_addr + 3, 3);
2290 break;
2291 case EUI64_ADDR_LEN:
2292 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2293 eui[0] ^= 2;
2294 break;
2295 default:
2296 return -1;
2297 }
2298
2299 return 0;
2300}
2301
2302static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2303{
2304 const union fwnet_hwaddr *ha;
2305
2306 if (dev->addr_len != FWNET_ALEN)
2307 return -1;
2308
2309 ha = (const union fwnet_hwaddr *)dev->dev_addr;
2310
2311 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2312 eui[0] ^= 2;
2313 return 0;
2314}
2315
2316static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2317{
2318 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2319 if (dev->addr_len != ARCNET_ALEN)
2320 return -1;
2321 memset(eui, 0, 7);
2322 eui[7] = *(u8 *)dev->dev_addr;
2323 return 0;
2324}
2325
2326static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2327{
2328 if (dev->addr_len != INFINIBAND_ALEN)
2329 return -1;
2330 memcpy(eui, dev->dev_addr + 12, 8);
2331 eui[0] |= 2;
2332 return 0;
2333}
2334
2335static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2336{
2337 if (addr == 0)
2338 return -1;
2339 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2340 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2341 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2342 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2343 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2344 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2345 eui[1] = 0;
2346 eui[2] = 0x5E;
2347 eui[3] = 0xFE;
2348 memcpy(eui + 4, &addr, 4);
2349 return 0;
2350}
2351
2352static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2353{
2354 if (dev->priv_flags & IFF_ISATAP)
2355 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2356 return -1;
2357}
2358
2359static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2360{
2361 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2362}
2363
2364static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2365{
2366 memcpy(eui, dev->perm_addr, 3);
2367 memcpy(eui + 5, dev->perm_addr + 3, 3);
2368 eui[3] = 0xFF;
2369 eui[4] = 0xFE;
2370 eui[0] ^= 2;
2371 return 0;
2372}
2373
2374static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2375{
2376 switch (dev->type) {
2377 case ARPHRD_ETHER:
2378 case ARPHRD_FDDI:
2379 return addrconf_ifid_eui48(eui, dev);
2380 case ARPHRD_ARCNET:
2381 return addrconf_ifid_arcnet(eui, dev);
2382 case ARPHRD_INFINIBAND:
2383 return addrconf_ifid_infiniband(eui, dev);
2384 case ARPHRD_SIT:
2385 return addrconf_ifid_sit(eui, dev);
2386 case ARPHRD_IPGRE:
2387 case ARPHRD_TUNNEL:
2388 return addrconf_ifid_gre(eui, dev);
2389 case ARPHRD_6LOWPAN:
2390 return addrconf_ifid_6lowpan(eui, dev);
2391 case ARPHRD_IEEE1394:
2392 return addrconf_ifid_ieee1394(eui, dev);
2393 case ARPHRD_TUNNEL6:
2394 case ARPHRD_IP6GRE:
2395 case ARPHRD_RAWIP:
2396 return addrconf_ifid_ip6tnl(eui, dev);
2397 }
2398 return -1;
2399}
2400
2401static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2402{
2403 int err = -1;
2404 struct inet6_ifaddr *ifp;
2405
2406 read_lock_bh(&idev->lock);
2407 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2408 if (ifp->scope > IFA_LINK)
2409 break;
2410 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2411 memcpy(eui, ifp->addr.s6_addr+8, 8);
2412 err = 0;
2413 break;
2414 }
2415 }
2416 read_unlock_bh(&idev->lock);
2417 return err;
2418}
2419
2420/* Generation of a randomized Interface Identifier
2421 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2422 */
2423
2424static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2425{
2426regen:
2427 get_random_bytes(&addr->s6_addr[8], 8);
2428
2429 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2430 * check if generated address is not inappropriate:
2431 *
2432 * - Reserved IPv6 Interface Identifiers
2433 * - XXX: already assigned to an address on the device
2434 */
2435
2436 /* Subnet-router anycast: 0000:0000:0000:0000 */
2437 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2438 goto regen;
2439
2440 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2441 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2442 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2443 */
2444 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2445 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2446 goto regen;
2447
2448 /* Reserved subnet anycast addresses */
2449 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2450 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2451 goto regen;
2452}
2453
2454/*
2455 * Add prefix route.
2456 */
2457
2458static void
2459addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2460 struct net_device *dev, unsigned long expires,
2461 u32 flags, gfp_t gfp_flags)
2462{
2463 struct fib6_config cfg = {
2464 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2465 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2466 .fc_ifindex = dev->ifindex,
2467 .fc_expires = expires,
2468 .fc_dst_len = plen,
2469 .fc_flags = RTF_UP | flags,
2470 .fc_nlinfo.nl_net = dev_net(dev),
2471 .fc_protocol = RTPROT_KERNEL,
2472 .fc_type = RTN_UNICAST,
2473 };
2474
2475 cfg.fc_dst = *pfx;
2476
2477 /* Prevent useless cloning on PtP SIT.
2478 This thing is done here expecting that the whole
2479 class of non-broadcast devices need not cloning.
2480 */
2481#if IS_ENABLED(CONFIG_IPV6_SIT)
2482 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2483 cfg.fc_flags |= RTF_NONEXTHOP;
2484#endif
2485
2486 ip6_route_add(&cfg, gfp_flags, NULL);
2487}
2488
2489
2490static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2491 int plen,
2492 const struct net_device *dev,
2493 u32 flags, u32 noflags,
2494 bool no_gw)
2495{
2496 struct fib6_node *fn;
2497 struct fib6_info *rt = NULL;
2498 struct fib6_table *table;
2499 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2500
2501 table = fib6_get_table(dev_net(dev), tb_id);
2502 if (!table)
2503 return NULL;
2504
2505 rcu_read_lock();
2506 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2507 if (!fn)
2508 goto out;
2509
2510 for_each_fib6_node_rt_rcu(fn) {
2511 /* prefix routes only use builtin fib6_nh */
2512 if (rt->nh)
2513 continue;
2514
2515 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2516 continue;
2517 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2518 continue;
2519 if ((rt->fib6_flags & flags) != flags)
2520 continue;
2521 if ((rt->fib6_flags & noflags) != 0)
2522 continue;
2523 if (!fib6_info_hold_safe(rt))
2524 continue;
2525 break;
2526 }
2527out:
2528 rcu_read_unlock();
2529 return rt;
2530}
2531
2532
2533/* Create "default" multicast route to the interface */
2534
2535static void addrconf_add_mroute(struct net_device *dev)
2536{
2537 struct fib6_config cfg = {
2538 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2539 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2540 .fc_ifindex = dev->ifindex,
2541 .fc_dst_len = 8,
2542 .fc_flags = RTF_UP,
2543 .fc_type = RTN_MULTICAST,
2544 .fc_nlinfo.nl_net = dev_net(dev),
2545 .fc_protocol = RTPROT_KERNEL,
2546 };
2547
2548 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2549
2550 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2551}
2552
2553static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2554{
2555 struct inet6_dev *idev;
2556
2557 ASSERT_RTNL();
2558
2559 idev = ipv6_find_idev(dev);
2560 if (IS_ERR(idev))
2561 return idev;
2562
2563 if (idev->cnf.disable_ipv6)
2564 return ERR_PTR(-EACCES);
2565
2566 /* Add default multicast route */
2567 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2568 addrconf_add_mroute(dev);
2569
2570 return idev;
2571}
2572
2573static void delete_tempaddrs(struct inet6_dev *idev,
2574 struct inet6_ifaddr *ifp)
2575{
2576 struct inet6_ifaddr *ift, *tmp;
2577
2578 write_lock_bh(&idev->lock);
2579 list_for_each_entry_safe(ift, tmp, &idev->tempaddr_list, tmp_list) {
2580 if (ift->ifpub != ifp)
2581 continue;
2582
2583 in6_ifa_hold(ift);
2584 write_unlock_bh(&idev->lock);
2585 ipv6_del_addr(ift);
2586 write_lock_bh(&idev->lock);
2587 }
2588 write_unlock_bh(&idev->lock);
2589}
2590
2591static void manage_tempaddrs(struct inet6_dev *idev,
2592 struct inet6_ifaddr *ifp,
2593 __u32 valid_lft, __u32 prefered_lft,
2594 bool create, unsigned long now)
2595{
2596 u32 flags;
2597 struct inet6_ifaddr *ift;
2598
2599 read_lock_bh(&idev->lock);
2600 /* update all temporary addresses in the list */
2601 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2602 int age, max_valid, max_prefered;
2603
2604 if (ifp != ift->ifpub)
2605 continue;
2606
2607 /* RFC 4941 section 3.3:
2608 * If a received option will extend the lifetime of a public
2609 * address, the lifetimes of temporary addresses should
2610 * be extended, subject to the overall constraint that no
2611 * temporary addresses should ever remain "valid" or "preferred"
2612 * for a time longer than (TEMP_VALID_LIFETIME) or
2613 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2614 */
2615 age = (now - ift->cstamp) / HZ;
2616 max_valid = READ_ONCE(idev->cnf.temp_valid_lft) - age;
2617 if (max_valid < 0)
2618 max_valid = 0;
2619
2620 max_prefered = READ_ONCE(idev->cnf.temp_prefered_lft) -
2621 idev->desync_factor - age;
2622 if (max_prefered < 0)
2623 max_prefered = 0;
2624
2625 if (valid_lft > max_valid)
2626 valid_lft = max_valid;
2627
2628 if (prefered_lft > max_prefered)
2629 prefered_lft = max_prefered;
2630
2631 spin_lock(&ift->lock);
2632 flags = ift->flags;
2633 ift->valid_lft = valid_lft;
2634 ift->prefered_lft = prefered_lft;
2635 ift->tstamp = now;
2636 if (prefered_lft > 0)
2637 ift->flags &= ~IFA_F_DEPRECATED;
2638
2639 spin_unlock(&ift->lock);
2640 if (!(flags&IFA_F_TENTATIVE))
2641 ipv6_ifa_notify(0, ift);
2642 }
2643
2644 /* Also create a temporary address if it's enabled but no temporary
2645 * address currently exists.
2646 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false
2647 * as part of cleanup (ie. deleting the mngtmpaddr).
2648 * We don't want that to result in creating a new temporary ip address.
2649 */
2650 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft))
2651 create = true;
2652
2653 if (create && READ_ONCE(idev->cnf.use_tempaddr) > 0) {
2654 /* When a new public address is created as described
2655 * in [ADDRCONF], also create a new temporary address.
2656 */
2657 read_unlock_bh(&idev->lock);
2658 ipv6_create_tempaddr(ifp, false);
2659 } else {
2660 read_unlock_bh(&idev->lock);
2661 }
2662}
2663
2664static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2665{
2666 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2667 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2668}
2669
2670int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2671 const struct prefix_info *pinfo,
2672 struct inet6_dev *in6_dev,
2673 const struct in6_addr *addr, int addr_type,
2674 u32 addr_flags, bool sllao, bool tokenized,
2675 __u32 valid_lft, u32 prefered_lft)
2676{
2677 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2678 int create = 0, update_lft = 0;
2679
2680 if (!ifp && valid_lft) {
2681 int max_addresses = READ_ONCE(in6_dev->cnf.max_addresses);
2682 struct ifa6_config cfg = {
2683 .pfx = addr,
2684 .plen = pinfo->prefix_len,
2685 .ifa_flags = addr_flags,
2686 .valid_lft = valid_lft,
2687 .preferred_lft = prefered_lft,
2688 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2689 .ifa_proto = IFAPROT_KERNEL_RA
2690 };
2691
2692#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2693 if ((READ_ONCE(net->ipv6.devconf_all->optimistic_dad) ||
2694 READ_ONCE(in6_dev->cnf.optimistic_dad)) &&
2695 !net->ipv6.devconf_all->forwarding && sllao)
2696 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2697#endif
2698
2699 /* Do not allow to create too much of autoconfigured
2700 * addresses; this would be too easy way to crash kernel.
2701 */
2702 if (!max_addresses ||
2703 ipv6_count_addresses(in6_dev) < max_addresses)
2704 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2705
2706 if (IS_ERR_OR_NULL(ifp))
2707 return -1;
2708
2709 create = 1;
2710 spin_lock_bh(&ifp->lock);
2711 ifp->flags |= IFA_F_MANAGETEMPADDR;
2712 ifp->cstamp = jiffies;
2713 ifp->tokenized = tokenized;
2714 spin_unlock_bh(&ifp->lock);
2715 addrconf_dad_start(ifp);
2716 }
2717
2718 if (ifp) {
2719 u32 flags;
2720 unsigned long now;
2721 u32 stored_lft;
2722
2723 /* update lifetime (RFC2462 5.5.3 e) */
2724 spin_lock_bh(&ifp->lock);
2725 now = jiffies;
2726 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2727 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2728 else
2729 stored_lft = 0;
2730
2731 /* RFC4862 Section 5.5.3e:
2732 * "Note that the preferred lifetime of the
2733 * corresponding address is always reset to
2734 * the Preferred Lifetime in the received
2735 * Prefix Information option, regardless of
2736 * whether the valid lifetime is also reset or
2737 * ignored."
2738 *
2739 * So we should always update prefered_lft here.
2740 */
2741 update_lft = !create && stored_lft;
2742
2743 if (update_lft && !READ_ONCE(in6_dev->cnf.ra_honor_pio_life)) {
2744 const u32 minimum_lft = min_t(u32,
2745 stored_lft, MIN_VALID_LIFETIME);
2746 valid_lft = max(valid_lft, minimum_lft);
2747 }
2748
2749 if (update_lft) {
2750 ifp->valid_lft = valid_lft;
2751 ifp->prefered_lft = prefered_lft;
2752 WRITE_ONCE(ifp->tstamp, now);
2753 flags = ifp->flags;
2754 ifp->flags &= ~IFA_F_DEPRECATED;
2755 spin_unlock_bh(&ifp->lock);
2756
2757 if (!(flags&IFA_F_TENTATIVE))
2758 ipv6_ifa_notify(0, ifp);
2759 } else
2760 spin_unlock_bh(&ifp->lock);
2761
2762 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2763 create, now);
2764
2765 in6_ifa_put(ifp);
2766 addrconf_verify(net);
2767 }
2768
2769 return 0;
2770}
2771EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2772
2773void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2774{
2775 struct prefix_info *pinfo;
2776 struct fib6_table *table;
2777 __u32 valid_lft;
2778 __u32 prefered_lft;
2779 int addr_type, err;
2780 u32 addr_flags = 0;
2781 struct inet6_dev *in6_dev;
2782 struct net *net = dev_net(dev);
2783 bool ignore_autoconf = false;
2784
2785 pinfo = (struct prefix_info *) opt;
2786
2787 if (len < sizeof(struct prefix_info)) {
2788 netdev_dbg(dev, "addrconf: prefix option too short\n");
2789 return;
2790 }
2791
2792 /*
2793 * Validation checks ([ADDRCONF], page 19)
2794 */
2795
2796 addr_type = ipv6_addr_type(&pinfo->prefix);
2797
2798 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2799 return;
2800
2801 valid_lft = ntohl(pinfo->valid);
2802 prefered_lft = ntohl(pinfo->prefered);
2803
2804 if (prefered_lft > valid_lft) {
2805 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2806 return;
2807 }
2808
2809 in6_dev = in6_dev_get(dev);
2810
2811 if (!in6_dev) {
2812 net_dbg_ratelimited("addrconf: device %s not configured\n",
2813 dev->name);
2814 return;
2815 }
2816
2817 if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft)
2818 goto put;
2819
2820 /*
2821 * Two things going on here:
2822 * 1) Add routes for on-link prefixes
2823 * 2) Configure prefixes with the auto flag set
2824 */
2825
2826 if (pinfo->onlink) {
2827 struct fib6_info *rt;
2828 unsigned long rt_expires;
2829
2830 /* Avoid arithmetic overflow. Really, we could
2831 * save rt_expires in seconds, likely valid_lft,
2832 * but it would require division in fib gc, that it
2833 * not good.
2834 */
2835 if (HZ > USER_HZ)
2836 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2837 else
2838 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2839
2840 if (addrconf_finite_timeout(rt_expires))
2841 rt_expires *= HZ;
2842
2843 rt = addrconf_get_prefix_route(&pinfo->prefix,
2844 pinfo->prefix_len,
2845 dev,
2846 RTF_ADDRCONF | RTF_PREFIX_RT,
2847 RTF_DEFAULT, true);
2848
2849 if (rt) {
2850 /* Autoconf prefix route */
2851 if (valid_lft == 0) {
2852 ip6_del_rt(net, rt, false);
2853 rt = NULL;
2854 } else {
2855 table = rt->fib6_table;
2856 spin_lock_bh(&table->tb6_lock);
2857
2858 if (addrconf_finite_timeout(rt_expires)) {
2859 /* not infinity */
2860 fib6_set_expires(rt, jiffies + rt_expires);
2861 fib6_add_gc_list(rt);
2862 } else {
2863 fib6_clean_expires(rt);
2864 fib6_remove_gc_list(rt);
2865 }
2866
2867 spin_unlock_bh(&table->tb6_lock);
2868 }
2869 } else if (valid_lft) {
2870 clock_t expires = 0;
2871 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2872 if (addrconf_finite_timeout(rt_expires)) {
2873 /* not infinity */
2874 flags |= RTF_EXPIRES;
2875 expires = jiffies_to_clock_t(rt_expires);
2876 }
2877 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2878 0, dev, expires, flags,
2879 GFP_ATOMIC);
2880 }
2881 fib6_info_release(rt);
2882 }
2883
2884 /* Try to figure out our local address for this prefix */
2885
2886 ignore_autoconf = READ_ONCE(in6_dev->cnf.ra_honor_pio_pflag) && pinfo->preferpd;
2887 if (pinfo->autoconf && in6_dev->cnf.autoconf && !ignore_autoconf) {
2888 struct in6_addr addr;
2889 bool tokenized = false, dev_addr_generated = false;
2890
2891 if (pinfo->prefix_len == 64) {
2892 memcpy(&addr, &pinfo->prefix, 8);
2893
2894 if (!ipv6_addr_any(&in6_dev->token)) {
2895 read_lock_bh(&in6_dev->lock);
2896 memcpy(addr.s6_addr + 8,
2897 in6_dev->token.s6_addr + 8, 8);
2898 read_unlock_bh(&in6_dev->lock);
2899 tokenized = true;
2900 } else if (is_addr_mode_generate_stable(in6_dev) &&
2901 !ipv6_generate_stable_address(&addr, 0,
2902 in6_dev)) {
2903 addr_flags |= IFA_F_STABLE_PRIVACY;
2904 goto ok;
2905 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2906 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2907 goto put;
2908 } else {
2909 dev_addr_generated = true;
2910 }
2911 goto ok;
2912 }
2913 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2914 pinfo->prefix_len);
2915 goto put;
2916
2917ok:
2918 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2919 &addr, addr_type,
2920 addr_flags, sllao,
2921 tokenized, valid_lft,
2922 prefered_lft);
2923 if (err)
2924 goto put;
2925
2926 /* Ignore error case here because previous prefix add addr was
2927 * successful which will be notified.
2928 */
2929 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2930 addr_type, addr_flags, sllao,
2931 tokenized, valid_lft,
2932 prefered_lft,
2933 dev_addr_generated);
2934 }
2935 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2936put:
2937 in6_dev_put(in6_dev);
2938}
2939
2940static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2941 struct in6_ifreq *ireq)
2942{
2943 struct ip_tunnel_parm_kern p = { };
2944 int err;
2945
2946 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2947 return -EADDRNOTAVAIL;
2948
2949 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2950 p.iph.version = 4;
2951 p.iph.ihl = 5;
2952 p.iph.protocol = IPPROTO_IPV6;
2953 p.iph.ttl = 64;
2954
2955 if (!dev->netdev_ops->ndo_tunnel_ctl)
2956 return -EOPNOTSUPP;
2957 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2958 if (err)
2959 return err;
2960
2961 dev = __dev_get_by_name(net, p.name);
2962 if (!dev)
2963 return -ENOBUFS;
2964 return dev_open(dev, NULL);
2965}
2966
2967/*
2968 * Set destination address.
2969 * Special case for SIT interfaces where we create a new "virtual"
2970 * device.
2971 */
2972int addrconf_set_dstaddr(struct net *net, void __user *arg)
2973{
2974 struct net_device *dev;
2975 struct in6_ifreq ireq;
2976 int err = -ENODEV;
2977
2978 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2979 return -ENODEV;
2980 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2981 return -EFAULT;
2982
2983 rtnl_lock();
2984 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2985 if (dev && dev->type == ARPHRD_SIT)
2986 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2987 rtnl_unlock();
2988 return err;
2989}
2990
2991static int ipv6_mc_config(struct sock *sk, bool join,
2992 const struct in6_addr *addr, int ifindex)
2993{
2994 int ret;
2995
2996 ASSERT_RTNL();
2997
2998 lock_sock(sk);
2999 if (join)
3000 ret = ipv6_sock_mc_join(sk, ifindex, addr);
3001 else
3002 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
3003 release_sock(sk);
3004
3005 return ret;
3006}
3007
3008/*
3009 * Manual configuration of address on an interface
3010 */
3011static int inet6_addr_add(struct net *net, int ifindex,
3012 struct ifa6_config *cfg,
3013 struct netlink_ext_ack *extack)
3014{
3015 struct inet6_ifaddr *ifp;
3016 struct inet6_dev *idev;
3017 struct net_device *dev;
3018 unsigned long timeout;
3019 clock_t expires;
3020 u32 flags;
3021
3022 ASSERT_RTNL();
3023
3024 if (cfg->plen > 128) {
3025 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
3026 return -EINVAL;
3027 }
3028
3029 /* check the lifetime */
3030 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) {
3031 NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid");
3032 return -EINVAL;
3033 }
3034
3035 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) {
3036 NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64");
3037 return -EINVAL;
3038 }
3039
3040 dev = __dev_get_by_index(net, ifindex);
3041 if (!dev)
3042 return -ENODEV;
3043
3044 idev = addrconf_add_dev(dev);
3045 if (IS_ERR(idev)) {
3046 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
3047 return PTR_ERR(idev);
3048 }
3049
3050 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3051 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3052 true, cfg->pfx, ifindex);
3053
3054 if (ret < 0) {
3055 NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed");
3056 return ret;
3057 }
3058 }
3059
3060 cfg->scope = ipv6_addr_scope(cfg->pfx);
3061
3062 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
3063 if (addrconf_finite_timeout(timeout)) {
3064 expires = jiffies_to_clock_t(timeout * HZ);
3065 cfg->valid_lft = timeout;
3066 flags = RTF_EXPIRES;
3067 } else {
3068 expires = 0;
3069 flags = 0;
3070 cfg->ifa_flags |= IFA_F_PERMANENT;
3071 }
3072
3073 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
3074 if (addrconf_finite_timeout(timeout)) {
3075 if (timeout == 0)
3076 cfg->ifa_flags |= IFA_F_DEPRECATED;
3077 cfg->preferred_lft = timeout;
3078 }
3079
3080 ifp = ipv6_add_addr(idev, cfg, true, extack);
3081 if (!IS_ERR(ifp)) {
3082 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
3083 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3084 ifp->rt_priority, dev, expires,
3085 flags, GFP_KERNEL);
3086 }
3087
3088 /* Send a netlink notification if DAD is enabled and
3089 * optimistic flag is not set
3090 */
3091 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
3092 ipv6_ifa_notify(0, ifp);
3093 /*
3094 * Note that section 3.1 of RFC 4429 indicates
3095 * that the Optimistic flag should not be set for
3096 * manually configured addresses
3097 */
3098 addrconf_dad_start(ifp);
3099 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
3100 manage_tempaddrs(idev, ifp, cfg->valid_lft,
3101 cfg->preferred_lft, true, jiffies);
3102 in6_ifa_put(ifp);
3103 addrconf_verify_rtnl(net);
3104 return 0;
3105 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3106 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
3107 cfg->pfx, ifindex);
3108 }
3109
3110 return PTR_ERR(ifp);
3111}
3112
3113static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3114 const struct in6_addr *pfx, unsigned int plen,
3115 struct netlink_ext_ack *extack)
3116{
3117 struct inet6_ifaddr *ifp;
3118 struct inet6_dev *idev;
3119 struct net_device *dev;
3120
3121 if (plen > 128) {
3122 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
3123 return -EINVAL;
3124 }
3125
3126 dev = __dev_get_by_index(net, ifindex);
3127 if (!dev) {
3128 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
3129 return -ENODEV;
3130 }
3131
3132 idev = __in6_dev_get(dev);
3133 if (!idev) {
3134 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
3135 return -ENXIO;
3136 }
3137
3138 read_lock_bh(&idev->lock);
3139 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3140 if (ifp->prefix_len == plen &&
3141 ipv6_addr_equal(pfx, &ifp->addr)) {
3142 in6_ifa_hold(ifp);
3143 read_unlock_bh(&idev->lock);
3144
3145 ipv6_del_addr(ifp);
3146
3147 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3148 (ifp->flags & IFA_F_MANAGETEMPADDR))
3149 delete_tempaddrs(idev, ifp);
3150
3151 addrconf_verify_rtnl(net);
3152 if (ipv6_addr_is_multicast(pfx)) {
3153 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3154 false, pfx, dev->ifindex);
3155 }
3156 return 0;
3157 }
3158 }
3159 read_unlock_bh(&idev->lock);
3160
3161 NL_SET_ERR_MSG_MOD(extack, "address not found");
3162 return -EADDRNOTAVAIL;
3163}
3164
3165
3166int addrconf_add_ifaddr(struct net *net, void __user *arg)
3167{
3168 struct ifa6_config cfg = {
3169 .ifa_flags = IFA_F_PERMANENT,
3170 .preferred_lft = INFINITY_LIFE_TIME,
3171 .valid_lft = INFINITY_LIFE_TIME,
3172 };
3173 struct in6_ifreq ireq;
3174 int err;
3175
3176 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3177 return -EPERM;
3178
3179 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3180 return -EFAULT;
3181
3182 cfg.pfx = &ireq.ifr6_addr;
3183 cfg.plen = ireq.ifr6_prefixlen;
3184
3185 rtnl_lock();
3186 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3187 rtnl_unlock();
3188 return err;
3189}
3190
3191int addrconf_del_ifaddr(struct net *net, void __user *arg)
3192{
3193 struct in6_ifreq ireq;
3194 int err;
3195
3196 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3197 return -EPERM;
3198
3199 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3200 return -EFAULT;
3201
3202 rtnl_lock();
3203 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3204 ireq.ifr6_prefixlen, NULL);
3205 rtnl_unlock();
3206 return err;
3207}
3208
3209static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3210 int plen, int scope, u8 proto)
3211{
3212 struct inet6_ifaddr *ifp;
3213 struct ifa6_config cfg = {
3214 .pfx = addr,
3215 .plen = plen,
3216 .ifa_flags = IFA_F_PERMANENT,
3217 .valid_lft = INFINITY_LIFE_TIME,
3218 .preferred_lft = INFINITY_LIFE_TIME,
3219 .scope = scope,
3220 .ifa_proto = proto
3221 };
3222
3223 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3224 if (!IS_ERR(ifp)) {
3225 spin_lock_bh(&ifp->lock);
3226 ifp->flags &= ~IFA_F_TENTATIVE;
3227 spin_unlock_bh(&ifp->lock);
3228 rt_genid_bump_ipv6(dev_net(idev->dev));
3229 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3230 in6_ifa_put(ifp);
3231 }
3232}
3233
3234#if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3235static void add_v4_addrs(struct inet6_dev *idev)
3236{
3237 struct in6_addr addr;
3238 struct net_device *dev;
3239 struct net *net = dev_net(idev->dev);
3240 int scope, plen, offset = 0;
3241 u32 pflags = 0;
3242
3243 ASSERT_RTNL();
3244
3245 memset(&addr, 0, sizeof(struct in6_addr));
3246 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */
3247 if (idev->dev->addr_len == sizeof(struct in6_addr))
3248 offset = sizeof(struct in6_addr) - 4;
3249 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
3250
3251 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) {
3252 scope = IPV6_ADDR_COMPATv4;
3253 plen = 96;
3254 pflags |= RTF_NONEXTHOP;
3255 } else {
3256 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3257 return;
3258
3259 addr.s6_addr32[0] = htonl(0xfe800000);
3260 scope = IFA_LINK;
3261 plen = 64;
3262 }
3263
3264 if (addr.s6_addr32[3]) {
3265 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC);
3266 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3267 GFP_KERNEL);
3268 return;
3269 }
3270
3271 for_each_netdev(net, dev) {
3272 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3273 if (in_dev && (dev->flags & IFF_UP)) {
3274 struct in_ifaddr *ifa;
3275 int flag = scope;
3276
3277 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3278 addr.s6_addr32[3] = ifa->ifa_local;
3279
3280 if (ifa->ifa_scope == RT_SCOPE_LINK)
3281 continue;
3282 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3283 if (idev->dev->flags&IFF_POINTOPOINT)
3284 continue;
3285 flag |= IFA_HOST;
3286 }
3287
3288 add_addr(idev, &addr, plen, flag,
3289 IFAPROT_UNSPEC);
3290 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3291 0, pflags, GFP_KERNEL);
3292 }
3293 }
3294 }
3295}
3296#endif
3297
3298static void init_loopback(struct net_device *dev)
3299{
3300 struct inet6_dev *idev;
3301
3302 /* ::1 */
3303
3304 ASSERT_RTNL();
3305
3306 idev = ipv6_find_idev(dev);
3307 if (IS_ERR(idev)) {
3308 pr_debug("%s: add_dev failed\n", __func__);
3309 return;
3310 }
3311
3312 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO);
3313}
3314
3315void addrconf_add_linklocal(struct inet6_dev *idev,
3316 const struct in6_addr *addr, u32 flags)
3317{
3318 struct ifa6_config cfg = {
3319 .pfx = addr,
3320 .plen = 64,
3321 .ifa_flags = flags | IFA_F_PERMANENT,
3322 .valid_lft = INFINITY_LIFE_TIME,
3323 .preferred_lft = INFINITY_LIFE_TIME,
3324 .scope = IFA_LINK,
3325 .ifa_proto = IFAPROT_KERNEL_LL
3326 };
3327 struct inet6_ifaddr *ifp;
3328
3329#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3330 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad) ||
3331 READ_ONCE(idev->cnf.optimistic_dad)) &&
3332 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3333 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3334#endif
3335
3336 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3337 if (!IS_ERR(ifp)) {
3338 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3339 0, 0, GFP_ATOMIC);
3340 addrconf_dad_start(ifp);
3341 in6_ifa_put(ifp);
3342 }
3343}
3344EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3345
3346static bool ipv6_reserved_interfaceid(struct in6_addr address)
3347{
3348 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3349 return true;
3350
3351 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3352 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3353 return true;
3354
3355 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3356 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3357 return true;
3358
3359 return false;
3360}
3361
3362static int ipv6_generate_stable_address(struct in6_addr *address,
3363 u8 dad_count,
3364 const struct inet6_dev *idev)
3365{
3366 static DEFINE_SPINLOCK(lock);
3367 static __u32 digest[SHA1_DIGEST_WORDS];
3368 static __u32 workspace[SHA1_WORKSPACE_WORDS];
3369
3370 static union {
3371 char __data[SHA1_BLOCK_SIZE];
3372 struct {
3373 struct in6_addr secret;
3374 __be32 prefix[2];
3375 unsigned char hwaddr[MAX_ADDR_LEN];
3376 u8 dad_count;
3377 } __packed;
3378 } data;
3379
3380 struct in6_addr secret;
3381 struct in6_addr temp;
3382 struct net *net = dev_net(idev->dev);
3383
3384 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3385
3386 if (idev->cnf.stable_secret.initialized)
3387 secret = idev->cnf.stable_secret.secret;
3388 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3389 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3390 else
3391 return -1;
3392
3393retry:
3394 spin_lock_bh(&lock);
3395
3396 sha1_init(digest);
3397 memset(&data, 0, sizeof(data));
3398 memset(workspace, 0, sizeof(workspace));
3399 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3400 data.prefix[0] = address->s6_addr32[0];
3401 data.prefix[1] = address->s6_addr32[1];
3402 data.secret = secret;
3403 data.dad_count = dad_count;
3404
3405 sha1_transform(digest, data.__data, workspace);
3406
3407 temp = *address;
3408 temp.s6_addr32[2] = (__force __be32)digest[0];
3409 temp.s6_addr32[3] = (__force __be32)digest[1];
3410
3411 spin_unlock_bh(&lock);
3412
3413 if (ipv6_reserved_interfaceid(temp)) {
3414 dad_count++;
3415 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3416 return -1;
3417 goto retry;
3418 }
3419
3420 *address = temp;
3421 return 0;
3422}
3423
3424static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3425{
3426 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3427
3428 if (s->initialized)
3429 return;
3430 s = &idev->cnf.stable_secret;
3431 get_random_bytes(&s->secret, sizeof(s->secret));
3432 s->initialized = true;
3433}
3434
3435static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3436{
3437 struct in6_addr addr;
3438
3439 /* no link local addresses on L3 master devices */
3440 if (netif_is_l3_master(idev->dev))
3441 return;
3442
3443 /* no link local addresses on devices flagged as slaves */
3444 if (idev->dev->priv_flags & IFF_NO_ADDRCONF)
3445 return;
3446
3447 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3448
3449 switch (idev->cnf.addr_gen_mode) {
3450 case IN6_ADDR_GEN_MODE_RANDOM:
3451 ipv6_gen_mode_random_init(idev);
3452 fallthrough;
3453 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3454 if (!ipv6_generate_stable_address(&addr, 0, idev))
3455 addrconf_add_linklocal(idev, &addr,
3456 IFA_F_STABLE_PRIVACY);
3457 else if (prefix_route)
3458 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3459 0, 0, GFP_KERNEL);
3460 break;
3461 case IN6_ADDR_GEN_MODE_EUI64:
3462 /* addrconf_add_linklocal also adds a prefix_route and we
3463 * only need to care about prefix routes if ipv6_generate_eui64
3464 * couldn't generate one.
3465 */
3466 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3467 addrconf_add_linklocal(idev, &addr, 0);
3468 else if (prefix_route)
3469 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3470 0, 0, GFP_KERNEL);
3471 break;
3472 case IN6_ADDR_GEN_MODE_NONE:
3473 default:
3474 /* will not add any link local address */
3475 break;
3476 }
3477}
3478
3479static void addrconf_dev_config(struct net_device *dev)
3480{
3481 struct inet6_dev *idev;
3482
3483 ASSERT_RTNL();
3484
3485 if ((dev->type != ARPHRD_ETHER) &&
3486 (dev->type != ARPHRD_FDDI) &&
3487 (dev->type != ARPHRD_ARCNET) &&
3488 (dev->type != ARPHRD_INFINIBAND) &&
3489 (dev->type != ARPHRD_IEEE1394) &&
3490 (dev->type != ARPHRD_TUNNEL6) &&
3491 (dev->type != ARPHRD_6LOWPAN) &&
3492 (dev->type != ARPHRD_TUNNEL) &&
3493 (dev->type != ARPHRD_NONE) &&
3494 (dev->type != ARPHRD_RAWIP)) {
3495 /* Alas, we support only Ethernet autoconfiguration. */
3496 idev = __in6_dev_get(dev);
3497 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3498 dev->flags & IFF_MULTICAST)
3499 ipv6_mc_up(idev);
3500 return;
3501 }
3502
3503 idev = addrconf_add_dev(dev);
3504 if (IS_ERR(idev))
3505 return;
3506
3507 /* this device type has no EUI support */
3508 if (dev->type == ARPHRD_NONE &&
3509 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3510 WRITE_ONCE(idev->cnf.addr_gen_mode,
3511 IN6_ADDR_GEN_MODE_RANDOM);
3512
3513 addrconf_addr_gen(idev, false);
3514}
3515
3516#if IS_ENABLED(CONFIG_IPV6_SIT)
3517static void addrconf_sit_config(struct net_device *dev)
3518{
3519 struct inet6_dev *idev;
3520
3521 ASSERT_RTNL();
3522
3523 /*
3524 * Configure the tunnel with one of our IPv4
3525 * addresses... we should configure all of
3526 * our v4 addrs in the tunnel
3527 */
3528
3529 idev = ipv6_find_idev(dev);
3530 if (IS_ERR(idev)) {
3531 pr_debug("%s: add_dev failed\n", __func__);
3532 return;
3533 }
3534
3535 if (dev->priv_flags & IFF_ISATAP) {
3536 addrconf_addr_gen(idev, false);
3537 return;
3538 }
3539
3540 add_v4_addrs(idev);
3541
3542 if (dev->flags&IFF_POINTOPOINT)
3543 addrconf_add_mroute(dev);
3544}
3545#endif
3546
3547#if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3548static void addrconf_gre_config(struct net_device *dev)
3549{
3550 struct inet6_dev *idev;
3551
3552 ASSERT_RTNL();
3553
3554 idev = ipv6_find_idev(dev);
3555 if (IS_ERR(idev)) {
3556 pr_debug("%s: add_dev failed\n", __func__);
3557 return;
3558 }
3559
3560 if (dev->type == ARPHRD_ETHER) {
3561 addrconf_addr_gen(idev, true);
3562 return;
3563 }
3564
3565 add_v4_addrs(idev);
3566
3567 if (dev->flags & IFF_POINTOPOINT)
3568 addrconf_add_mroute(dev);
3569}
3570#endif
3571
3572static void addrconf_init_auto_addrs(struct net_device *dev)
3573{
3574 switch (dev->type) {
3575#if IS_ENABLED(CONFIG_IPV6_SIT)
3576 case ARPHRD_SIT:
3577 addrconf_sit_config(dev);
3578 break;
3579#endif
3580#if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3581 case ARPHRD_IP6GRE:
3582 case ARPHRD_IPGRE:
3583 addrconf_gre_config(dev);
3584 break;
3585#endif
3586 case ARPHRD_LOOPBACK:
3587 init_loopback(dev);
3588 break;
3589
3590 default:
3591 addrconf_dev_config(dev);
3592 break;
3593 }
3594}
3595
3596static int fixup_permanent_addr(struct net *net,
3597 struct inet6_dev *idev,
3598 struct inet6_ifaddr *ifp)
3599{
3600 /* !fib6_node means the host route was removed from the
3601 * FIB, for example, if 'lo' device is taken down. In that
3602 * case regenerate the host route.
3603 */
3604 if (!ifp->rt || !ifp->rt->fib6_node) {
3605 struct fib6_info *f6i, *prev;
3606
3607 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3608 GFP_ATOMIC, NULL);
3609 if (IS_ERR(f6i))
3610 return PTR_ERR(f6i);
3611
3612 /* ifp->rt can be accessed outside of rtnl */
3613 spin_lock(&ifp->lock);
3614 prev = ifp->rt;
3615 ifp->rt = f6i;
3616 spin_unlock(&ifp->lock);
3617
3618 fib6_info_release(prev);
3619 }
3620
3621 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3622 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3623 ifp->rt_priority, idev->dev, 0, 0,
3624 GFP_ATOMIC);
3625 }
3626
3627 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3628 addrconf_dad_start(ifp);
3629
3630 return 0;
3631}
3632
3633static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3634{
3635 struct inet6_ifaddr *ifp, *tmp;
3636 struct inet6_dev *idev;
3637
3638 idev = __in6_dev_get(dev);
3639 if (!idev)
3640 return;
3641
3642 write_lock_bh(&idev->lock);
3643
3644 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3645 if ((ifp->flags & IFA_F_PERMANENT) &&
3646 fixup_permanent_addr(net, idev, ifp) < 0) {
3647 write_unlock_bh(&idev->lock);
3648 in6_ifa_hold(ifp);
3649 ipv6_del_addr(ifp);
3650 write_lock_bh(&idev->lock);
3651
3652 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3653 idev->dev->name, &ifp->addr);
3654 }
3655 }
3656
3657 write_unlock_bh(&idev->lock);
3658}
3659
3660static int addrconf_notify(struct notifier_block *this, unsigned long event,
3661 void *ptr)
3662{
3663 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3664 struct netdev_notifier_change_info *change_info;
3665 struct netdev_notifier_changeupper_info *info;
3666 struct inet6_dev *idev = __in6_dev_get(dev);
3667 struct net *net = dev_net(dev);
3668 int run_pending = 0;
3669 int err;
3670
3671 switch (event) {
3672 case NETDEV_REGISTER:
3673 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3674 idev = ipv6_add_dev(dev);
3675 if (IS_ERR(idev))
3676 return notifier_from_errno(PTR_ERR(idev));
3677 }
3678 break;
3679
3680 case NETDEV_CHANGEMTU:
3681 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3682 if (dev->mtu < IPV6_MIN_MTU) {
3683 addrconf_ifdown(dev, dev != net->loopback_dev);
3684 break;
3685 }
3686
3687 if (idev) {
3688 rt6_mtu_change(dev, dev->mtu);
3689 WRITE_ONCE(idev->cnf.mtu6, dev->mtu);
3690 break;
3691 }
3692
3693 /* allocate new idev */
3694 idev = ipv6_add_dev(dev);
3695 if (IS_ERR(idev))
3696 break;
3697
3698 /* device is still not ready */
3699 if (!(idev->if_flags & IF_READY))
3700 break;
3701
3702 run_pending = 1;
3703 fallthrough;
3704 case NETDEV_UP:
3705 case NETDEV_CHANGE:
3706 if (idev && idev->cnf.disable_ipv6)
3707 break;
3708
3709 if (dev->priv_flags & IFF_NO_ADDRCONF) {
3710 if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) &&
3711 dev->flags & IFF_UP && dev->flags & IFF_MULTICAST)
3712 ipv6_mc_up(idev);
3713 break;
3714 }
3715
3716 if (event == NETDEV_UP) {
3717 /* restore routes for permanent addresses */
3718 addrconf_permanent_addr(net, dev);
3719
3720 if (!addrconf_link_ready(dev)) {
3721 /* device is not ready yet. */
3722 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3723 dev->name);
3724 break;
3725 }
3726
3727 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3728 idev = ipv6_add_dev(dev);
3729
3730 if (!IS_ERR_OR_NULL(idev)) {
3731 idev->if_flags |= IF_READY;
3732 run_pending = 1;
3733 }
3734 } else if (event == NETDEV_CHANGE) {
3735 if (!addrconf_link_ready(dev)) {
3736 /* device is still not ready. */
3737 rt6_sync_down_dev(dev, event);
3738 break;
3739 }
3740
3741 if (!IS_ERR_OR_NULL(idev)) {
3742 if (idev->if_flags & IF_READY) {
3743 /* device is already configured -
3744 * but resend MLD reports, we might
3745 * have roamed and need to update
3746 * multicast snooping switches
3747 */
3748 ipv6_mc_up(idev);
3749 change_info = ptr;
3750 if (change_info->flags_changed & IFF_NOARP)
3751 addrconf_dad_run(idev, true);
3752 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3753 break;
3754 }
3755 idev->if_flags |= IF_READY;
3756 }
3757
3758 pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3759 dev->name);
3760
3761 run_pending = 1;
3762 }
3763
3764 addrconf_init_auto_addrs(dev);
3765
3766 if (!IS_ERR_OR_NULL(idev)) {
3767 if (run_pending)
3768 addrconf_dad_run(idev, false);
3769
3770 /* Device has an address by now */
3771 rt6_sync_up(dev, RTNH_F_DEAD);
3772
3773 /*
3774 * If the MTU changed during the interface down,
3775 * when the interface up, the changed MTU must be
3776 * reflected in the idev as well as routers.
3777 */
3778 if (idev->cnf.mtu6 != dev->mtu &&
3779 dev->mtu >= IPV6_MIN_MTU) {
3780 rt6_mtu_change(dev, dev->mtu);
3781 WRITE_ONCE(idev->cnf.mtu6, dev->mtu);
3782 }
3783 WRITE_ONCE(idev->tstamp, jiffies);
3784 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3785
3786 /*
3787 * If the changed mtu during down is lower than
3788 * IPV6_MIN_MTU stop IPv6 on this interface.
3789 */
3790 if (dev->mtu < IPV6_MIN_MTU)
3791 addrconf_ifdown(dev, dev != net->loopback_dev);
3792 }
3793 break;
3794
3795 case NETDEV_DOWN:
3796 case NETDEV_UNREGISTER:
3797 /*
3798 * Remove all addresses from this interface.
3799 */
3800 addrconf_ifdown(dev, event != NETDEV_DOWN);
3801 break;
3802
3803 case NETDEV_CHANGENAME:
3804 if (idev) {
3805 snmp6_unregister_dev(idev);
3806 addrconf_sysctl_unregister(idev);
3807 err = addrconf_sysctl_register(idev);
3808 if (err)
3809 return notifier_from_errno(err);
3810 err = snmp6_register_dev(idev);
3811 if (err) {
3812 addrconf_sysctl_unregister(idev);
3813 return notifier_from_errno(err);
3814 }
3815 }
3816 break;
3817
3818 case NETDEV_PRE_TYPE_CHANGE:
3819 case NETDEV_POST_TYPE_CHANGE:
3820 if (idev)
3821 addrconf_type_change(dev, event);
3822 break;
3823
3824 case NETDEV_CHANGEUPPER:
3825 info = ptr;
3826
3827 /* flush all routes if dev is linked to or unlinked from
3828 * an L3 master device (e.g., VRF)
3829 */
3830 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3831 addrconf_ifdown(dev, false);
3832 }
3833
3834 return NOTIFY_OK;
3835}
3836
3837/*
3838 * addrconf module should be notified of a device going up
3839 */
3840static struct notifier_block ipv6_dev_notf = {
3841 .notifier_call = addrconf_notify,
3842 .priority = ADDRCONF_NOTIFY_PRIORITY,
3843};
3844
3845static void addrconf_type_change(struct net_device *dev, unsigned long event)
3846{
3847 struct inet6_dev *idev;
3848 ASSERT_RTNL();
3849
3850 idev = __in6_dev_get(dev);
3851
3852 if (event == NETDEV_POST_TYPE_CHANGE)
3853 ipv6_mc_remap(idev);
3854 else if (event == NETDEV_PRE_TYPE_CHANGE)
3855 ipv6_mc_unmap(idev);
3856}
3857
3858static bool addr_is_local(const struct in6_addr *addr)
3859{
3860 return ipv6_addr_type(addr) &
3861 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3862}
3863
3864static int addrconf_ifdown(struct net_device *dev, bool unregister)
3865{
3866 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3867 struct net *net = dev_net(dev);
3868 struct inet6_dev *idev;
3869 struct inet6_ifaddr *ifa;
3870 LIST_HEAD(tmp_addr_list);
3871 bool keep_addr = false;
3872 bool was_ready;
3873 int state, i;
3874
3875 ASSERT_RTNL();
3876
3877 rt6_disable_ip(dev, event);
3878
3879 idev = __in6_dev_get(dev);
3880 if (!idev)
3881 return -ENODEV;
3882
3883 /*
3884 * Step 1: remove reference to ipv6 device from parent device.
3885 * Do not dev_put!
3886 */
3887 if (unregister) {
3888 idev->dead = 1;
3889
3890 /* protected by rtnl_lock */
3891 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3892
3893 /* Step 1.5: remove snmp6 entry */
3894 snmp6_unregister_dev(idev);
3895
3896 }
3897
3898 /* combine the user config with event to determine if permanent
3899 * addresses are to be removed from address hash table
3900 */
3901 if (!unregister && !idev->cnf.disable_ipv6) {
3902 /* aggregate the system setting and interface setting */
3903 int _keep_addr = READ_ONCE(net->ipv6.devconf_all->keep_addr_on_down);
3904
3905 if (!_keep_addr)
3906 _keep_addr = READ_ONCE(idev->cnf.keep_addr_on_down);
3907
3908 keep_addr = (_keep_addr > 0);
3909 }
3910
3911 /* Step 2: clear hash table */
3912 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3913 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i];
3914
3915 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
3916restart:
3917 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3918 if (ifa->idev == idev) {
3919 addrconf_del_dad_work(ifa);
3920 /* combined flag + permanent flag decide if
3921 * address is retained on a down event
3922 */
3923 if (!keep_addr ||
3924 !(ifa->flags & IFA_F_PERMANENT) ||
3925 addr_is_local(&ifa->addr)) {
3926 hlist_del_init_rcu(&ifa->addr_lst);
3927 goto restart;
3928 }
3929 }
3930 }
3931 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
3932 }
3933
3934 write_lock_bh(&idev->lock);
3935
3936 addrconf_del_rs_timer(idev);
3937
3938 /* Step 2: clear flags for stateless addrconf, repeated down
3939 * detection
3940 */
3941 was_ready = idev->if_flags & IF_READY;
3942 if (!unregister)
3943 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3944
3945 /* Step 3: clear tempaddr list */
3946 while (!list_empty(&idev->tempaddr_list)) {
3947 ifa = list_first_entry(&idev->tempaddr_list,
3948 struct inet6_ifaddr, tmp_list);
3949 list_del(&ifa->tmp_list);
3950 write_unlock_bh(&idev->lock);
3951 spin_lock_bh(&ifa->lock);
3952
3953 if (ifa->ifpub) {
3954 in6_ifa_put(ifa->ifpub);
3955 ifa->ifpub = NULL;
3956 }
3957 spin_unlock_bh(&ifa->lock);
3958 in6_ifa_put(ifa);
3959 write_lock_bh(&idev->lock);
3960 }
3961
3962 list_for_each_entry(ifa, &idev->addr_list, if_list)
3963 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3964 write_unlock_bh(&idev->lock);
3965
3966 while (!list_empty(&tmp_addr_list)) {
3967 struct fib6_info *rt = NULL;
3968 bool keep;
3969
3970 ifa = list_first_entry(&tmp_addr_list,
3971 struct inet6_ifaddr, if_list_aux);
3972 list_del(&ifa->if_list_aux);
3973
3974 addrconf_del_dad_work(ifa);
3975
3976 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3977 !addr_is_local(&ifa->addr);
3978
3979 spin_lock_bh(&ifa->lock);
3980
3981 if (keep) {
3982 /* set state to skip the notifier below */
3983 state = INET6_IFADDR_STATE_DEAD;
3984 ifa->state = INET6_IFADDR_STATE_PREDAD;
3985 if (!(ifa->flags & IFA_F_NODAD))
3986 ifa->flags |= IFA_F_TENTATIVE;
3987
3988 rt = ifa->rt;
3989 ifa->rt = NULL;
3990 } else {
3991 state = ifa->state;
3992 ifa->state = INET6_IFADDR_STATE_DEAD;
3993 }
3994
3995 spin_unlock_bh(&ifa->lock);
3996
3997 if (rt)
3998 ip6_del_rt(net, rt, false);
3999
4000 if (state != INET6_IFADDR_STATE_DEAD) {
4001 __ipv6_ifa_notify(RTM_DELADDR, ifa);
4002 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
4003 } else {
4004 if (idev->cnf.forwarding)
4005 addrconf_leave_anycast(ifa);
4006 addrconf_leave_solict(ifa->idev, &ifa->addr);
4007 }
4008
4009 if (!keep) {
4010 write_lock_bh(&idev->lock);
4011 list_del_rcu(&ifa->if_list);
4012 write_unlock_bh(&idev->lock);
4013 in6_ifa_put(ifa);
4014 }
4015 }
4016
4017 /* Step 5: Discard anycast and multicast list */
4018 if (unregister) {
4019 ipv6_ac_destroy_dev(idev);
4020 ipv6_mc_destroy_dev(idev);
4021 } else if (was_ready) {
4022 ipv6_mc_down(idev);
4023 }
4024
4025 WRITE_ONCE(idev->tstamp, jiffies);
4026 idev->ra_mtu = 0;
4027
4028 /* Last: Shot the device (if unregistered) */
4029 if (unregister) {
4030 addrconf_sysctl_unregister(idev);
4031 neigh_parms_release(&nd_tbl, idev->nd_parms);
4032 neigh_ifdown(&nd_tbl, dev);
4033 in6_dev_put(idev);
4034 }
4035 return 0;
4036}
4037
4038static void addrconf_rs_timer(struct timer_list *t)
4039{
4040 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
4041 struct net_device *dev = idev->dev;
4042 struct in6_addr lladdr;
4043 int rtr_solicits;
4044
4045 write_lock(&idev->lock);
4046 if (idev->dead || !(idev->if_flags & IF_READY))
4047 goto out;
4048
4049 if (!ipv6_accept_ra(idev))
4050 goto out;
4051
4052 /* Announcement received after solicitation was sent */
4053 if (idev->if_flags & IF_RA_RCVD)
4054 goto out;
4055
4056 rtr_solicits = READ_ONCE(idev->cnf.rtr_solicits);
4057
4058 if (idev->rs_probes++ < rtr_solicits || rtr_solicits < 0) {
4059 write_unlock(&idev->lock);
4060 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4061 ndisc_send_rs(dev, &lladdr,
4062 &in6addr_linklocal_allrouters);
4063 else
4064 goto put;
4065
4066 write_lock(&idev->lock);
4067 idev->rs_interval = rfc3315_s14_backoff_update(
4068 idev->rs_interval,
4069 READ_ONCE(idev->cnf.rtr_solicit_max_interval));
4070 /* The wait after the last probe can be shorter */
4071 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
4072 READ_ONCE(idev->cnf.rtr_solicits)) ?
4073 READ_ONCE(idev->cnf.rtr_solicit_delay) :
4074 idev->rs_interval);
4075 } else {
4076 /*
4077 * Note: we do not support deprecated "all on-link"
4078 * assumption any longer.
4079 */
4080 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
4081 }
4082
4083out:
4084 write_unlock(&idev->lock);
4085put:
4086 in6_dev_put(idev);
4087}
4088
4089/*
4090 * Duplicate Address Detection
4091 */
4092static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
4093{
4094 struct inet6_dev *idev = ifp->idev;
4095 unsigned long rand_num;
4096 u64 nonce;
4097
4098 if (ifp->flags & IFA_F_OPTIMISTIC)
4099 rand_num = 0;
4100 else
4101 rand_num = get_random_u32_below(
4102 READ_ONCE(idev->cnf.rtr_solicit_delay) ? : 1);
4103
4104 nonce = 0;
4105 if (READ_ONCE(idev->cnf.enhanced_dad) ||
4106 READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad)) {
4107 do
4108 get_random_bytes(&nonce, 6);
4109 while (nonce == 0);
4110 }
4111 ifp->dad_nonce = nonce;
4112 ifp->dad_probes = READ_ONCE(idev->cnf.dad_transmits);
4113 addrconf_mod_dad_work(ifp, rand_num);
4114}
4115
4116static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
4117{
4118 struct inet6_dev *idev = ifp->idev;
4119 struct net_device *dev = idev->dev;
4120 bool bump_id, notify = false;
4121 struct net *net;
4122
4123 addrconf_join_solict(dev, &ifp->addr);
4124
4125 read_lock_bh(&idev->lock);
4126 spin_lock(&ifp->lock);
4127 if (ifp->state == INET6_IFADDR_STATE_DEAD)
4128 goto out;
4129
4130 net = dev_net(dev);
4131 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
4132 (READ_ONCE(net->ipv6.devconf_all->accept_dad) < 1 &&
4133 READ_ONCE(idev->cnf.accept_dad) < 1) ||
4134 !(ifp->flags&IFA_F_TENTATIVE) ||
4135 ifp->flags & IFA_F_NODAD) {
4136 bool send_na = false;
4137
4138 if (ifp->flags & IFA_F_TENTATIVE &&
4139 !(ifp->flags & IFA_F_OPTIMISTIC))
4140 send_na = true;
4141 bump_id = ifp->flags & IFA_F_TENTATIVE;
4142 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4143 spin_unlock(&ifp->lock);
4144 read_unlock_bh(&idev->lock);
4145
4146 addrconf_dad_completed(ifp, bump_id, send_na);
4147 return;
4148 }
4149
4150 if (!(idev->if_flags & IF_READY)) {
4151 spin_unlock(&ifp->lock);
4152 read_unlock_bh(&idev->lock);
4153 /*
4154 * If the device is not ready:
4155 * - keep it tentative if it is a permanent address.
4156 * - otherwise, kill it.
4157 */
4158 in6_ifa_hold(ifp);
4159 addrconf_dad_stop(ifp, 0);
4160 return;
4161 }
4162
4163 /*
4164 * Optimistic nodes can start receiving
4165 * Frames right away
4166 */
4167 if (ifp->flags & IFA_F_OPTIMISTIC) {
4168 ip6_ins_rt(net, ifp->rt);
4169 if (ipv6_use_optimistic_addr(net, idev)) {
4170 /* Because optimistic nodes can use this address,
4171 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4172 */
4173 notify = true;
4174 }
4175 }
4176
4177 addrconf_dad_kick(ifp);
4178out:
4179 spin_unlock(&ifp->lock);
4180 read_unlock_bh(&idev->lock);
4181 if (notify)
4182 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4183}
4184
4185static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4186{
4187 bool begin_dad = false;
4188
4189 spin_lock_bh(&ifp->lock);
4190 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4191 ifp->state = INET6_IFADDR_STATE_PREDAD;
4192 begin_dad = true;
4193 }
4194 spin_unlock_bh(&ifp->lock);
4195
4196 if (begin_dad)
4197 addrconf_mod_dad_work(ifp, 0);
4198}
4199
4200static void addrconf_dad_work(struct work_struct *w)
4201{
4202 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4203 struct inet6_ifaddr,
4204 dad_work);
4205 struct inet6_dev *idev = ifp->idev;
4206 bool bump_id, disable_ipv6 = false;
4207 struct in6_addr mcaddr;
4208
4209 enum {
4210 DAD_PROCESS,
4211 DAD_BEGIN,
4212 DAD_ABORT,
4213 } action = DAD_PROCESS;
4214
4215 rtnl_lock();
4216
4217 spin_lock_bh(&ifp->lock);
4218 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4219 action = DAD_BEGIN;
4220 ifp->state = INET6_IFADDR_STATE_DAD;
4221 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4222 action = DAD_ABORT;
4223 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4224
4225 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->accept_dad) > 1 ||
4226 READ_ONCE(idev->cnf.accept_dad) > 1) &&
4227 !idev->cnf.disable_ipv6 &&
4228 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4229 struct in6_addr addr;
4230
4231 addr.s6_addr32[0] = htonl(0xfe800000);
4232 addr.s6_addr32[1] = 0;
4233
4234 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4235 ipv6_addr_equal(&ifp->addr, &addr)) {
4236 /* DAD failed for link-local based on MAC */
4237 WRITE_ONCE(idev->cnf.disable_ipv6, 1);
4238
4239 pr_info("%s: IPv6 being disabled!\n",
4240 ifp->idev->dev->name);
4241 disable_ipv6 = true;
4242 }
4243 }
4244 }
4245 spin_unlock_bh(&ifp->lock);
4246
4247 if (action == DAD_BEGIN) {
4248 addrconf_dad_begin(ifp);
4249 goto out;
4250 } else if (action == DAD_ABORT) {
4251 in6_ifa_hold(ifp);
4252 addrconf_dad_stop(ifp, 1);
4253 if (disable_ipv6)
4254 addrconf_ifdown(idev->dev, false);
4255 goto out;
4256 }
4257
4258 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4259 goto out;
4260
4261 write_lock_bh(&idev->lock);
4262 if (idev->dead || !(idev->if_flags & IF_READY)) {
4263 write_unlock_bh(&idev->lock);
4264 goto out;
4265 }
4266
4267 spin_lock(&ifp->lock);
4268 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4269 spin_unlock(&ifp->lock);
4270 write_unlock_bh(&idev->lock);
4271 goto out;
4272 }
4273
4274 if (ifp->dad_probes == 0) {
4275 bool send_na = false;
4276
4277 /*
4278 * DAD was successful
4279 */
4280
4281 if (ifp->flags & IFA_F_TENTATIVE &&
4282 !(ifp->flags & IFA_F_OPTIMISTIC))
4283 send_na = true;
4284 bump_id = ifp->flags & IFA_F_TENTATIVE;
4285 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4286 spin_unlock(&ifp->lock);
4287 write_unlock_bh(&idev->lock);
4288
4289 addrconf_dad_completed(ifp, bump_id, send_na);
4290
4291 goto out;
4292 }
4293
4294 ifp->dad_probes--;
4295 addrconf_mod_dad_work(ifp,
4296 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4297 HZ/100));
4298 spin_unlock(&ifp->lock);
4299 write_unlock_bh(&idev->lock);
4300
4301 /* send a neighbour solicitation for our addr */
4302 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4303 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4304 ifp->dad_nonce);
4305out:
4306 in6_ifa_put(ifp);
4307 rtnl_unlock();
4308}
4309
4310/* ifp->idev must be at least read locked */
4311static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4312{
4313 struct inet6_ifaddr *ifpiter;
4314 struct inet6_dev *idev = ifp->idev;
4315
4316 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4317 if (ifpiter->scope > IFA_LINK)
4318 break;
4319 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4320 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4321 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4322 IFA_F_PERMANENT)
4323 return false;
4324 }
4325 return true;
4326}
4327
4328static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4329 bool send_na)
4330{
4331 struct net_device *dev = ifp->idev->dev;
4332 struct in6_addr lladdr;
4333 bool send_rs, send_mld;
4334
4335 addrconf_del_dad_work(ifp);
4336
4337 /*
4338 * Configure the address for reception. Now it is valid.
4339 */
4340
4341 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4342
4343 /* If added prefix is link local and we are prepared to process
4344 router advertisements, start sending router solicitations.
4345 */
4346
4347 read_lock_bh(&ifp->idev->lock);
4348 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4349 send_rs = send_mld &&
4350 ipv6_accept_ra(ifp->idev) &&
4351 READ_ONCE(ifp->idev->cnf.rtr_solicits) != 0 &&
4352 (dev->flags & IFF_LOOPBACK) == 0 &&
4353 (dev->type != ARPHRD_TUNNEL) &&
4354 !netif_is_team_port(dev);
4355 read_unlock_bh(&ifp->idev->lock);
4356
4357 /* While dad is in progress mld report's source address is in6_addrany.
4358 * Resend with proper ll now.
4359 */
4360 if (send_mld)
4361 ipv6_mc_dad_complete(ifp->idev);
4362
4363 /* send unsolicited NA if enabled */
4364 if (send_na &&
4365 (READ_ONCE(ifp->idev->cnf.ndisc_notify) ||
4366 READ_ONCE(dev_net(dev)->ipv6.devconf_all->ndisc_notify))) {
4367 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4368 /*router=*/ !!ifp->idev->cnf.forwarding,
4369 /*solicited=*/ false, /*override=*/ true,
4370 /*inc_opt=*/ true);
4371 }
4372
4373 if (send_rs) {
4374 /*
4375 * If a host as already performed a random delay
4376 * [...] as part of DAD [...] there is no need
4377 * to delay again before sending the first RS
4378 */
4379 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4380 return;
4381 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4382
4383 write_lock_bh(&ifp->idev->lock);
4384 spin_lock(&ifp->lock);
4385 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4386 READ_ONCE(ifp->idev->cnf.rtr_solicit_interval));
4387 ifp->idev->rs_probes = 1;
4388 ifp->idev->if_flags |= IF_RS_SENT;
4389 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4390 spin_unlock(&ifp->lock);
4391 write_unlock_bh(&ifp->idev->lock);
4392 }
4393
4394 if (bump_id)
4395 rt_genid_bump_ipv6(dev_net(dev));
4396
4397 /* Make sure that a new temporary address will be created
4398 * before this temporary address becomes deprecated.
4399 */
4400 if (ifp->flags & IFA_F_TEMPORARY)
4401 addrconf_verify_rtnl(dev_net(dev));
4402}
4403
4404static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4405{
4406 struct inet6_ifaddr *ifp;
4407
4408 read_lock_bh(&idev->lock);
4409 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4410 spin_lock(&ifp->lock);
4411 if ((ifp->flags & IFA_F_TENTATIVE &&
4412 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4413 if (restart)
4414 ifp->state = INET6_IFADDR_STATE_PREDAD;
4415 addrconf_dad_kick(ifp);
4416 }
4417 spin_unlock(&ifp->lock);
4418 }
4419 read_unlock_bh(&idev->lock);
4420}
4421
4422#ifdef CONFIG_PROC_FS
4423struct if6_iter_state {
4424 struct seq_net_private p;
4425 int bucket;
4426 int offset;
4427};
4428
4429static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4430{
4431 struct if6_iter_state *state = seq->private;
4432 struct net *net = seq_file_net(seq);
4433 struct inet6_ifaddr *ifa = NULL;
4434 int p = 0;
4435
4436 /* initial bucket if pos is 0 */
4437 if (pos == 0) {
4438 state->bucket = 0;
4439 state->offset = 0;
4440 }
4441
4442 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4443 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket],
4444 addr_lst) {
4445 /* sync with offset */
4446 if (p < state->offset) {
4447 p++;
4448 continue;
4449 }
4450 return ifa;
4451 }
4452
4453 /* prepare for next bucket */
4454 state->offset = 0;
4455 p = 0;
4456 }
4457 return NULL;
4458}
4459
4460static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4461 struct inet6_ifaddr *ifa)
4462{
4463 struct if6_iter_state *state = seq->private;
4464 struct net *net = seq_file_net(seq);
4465
4466 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4467 state->offset++;
4468 return ifa;
4469 }
4470
4471 state->offset = 0;
4472 while (++state->bucket < IN6_ADDR_HSIZE) {
4473 hlist_for_each_entry_rcu(ifa,
4474 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) {
4475 return ifa;
4476 }
4477 }
4478
4479 return NULL;
4480}
4481
4482static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4483 __acquires(rcu)
4484{
4485 rcu_read_lock();
4486 return if6_get_first(seq, *pos);
4487}
4488
4489static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4490{
4491 struct inet6_ifaddr *ifa;
4492
4493 ifa = if6_get_next(seq, v);
4494 ++*pos;
4495 return ifa;
4496}
4497
4498static void if6_seq_stop(struct seq_file *seq, void *v)
4499 __releases(rcu)
4500{
4501 rcu_read_unlock();
4502}
4503
4504static int if6_seq_show(struct seq_file *seq, void *v)
4505{
4506 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4507 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4508 &ifp->addr,
4509 ifp->idev->dev->ifindex,
4510 ifp->prefix_len,
4511 ifp->scope,
4512 (u8) ifp->flags,
4513 ifp->idev->dev->name);
4514 return 0;
4515}
4516
4517static const struct seq_operations if6_seq_ops = {
4518 .start = if6_seq_start,
4519 .next = if6_seq_next,
4520 .show = if6_seq_show,
4521 .stop = if6_seq_stop,
4522};
4523
4524static int __net_init if6_proc_net_init(struct net *net)
4525{
4526 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4527 sizeof(struct if6_iter_state)))
4528 return -ENOMEM;
4529 return 0;
4530}
4531
4532static void __net_exit if6_proc_net_exit(struct net *net)
4533{
4534 remove_proc_entry("if_inet6", net->proc_net);
4535}
4536
4537static struct pernet_operations if6_proc_net_ops = {
4538 .init = if6_proc_net_init,
4539 .exit = if6_proc_net_exit,
4540};
4541
4542int __init if6_proc_init(void)
4543{
4544 return register_pernet_subsys(&if6_proc_net_ops);
4545}
4546
4547void if6_proc_exit(void)
4548{
4549 unregister_pernet_subsys(&if6_proc_net_ops);
4550}
4551#endif /* CONFIG_PROC_FS */
4552
4553#if IS_ENABLED(CONFIG_IPV6_MIP6)
4554/* Check if address is a home address configured on any interface. */
4555int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4556{
4557 unsigned int hash = inet6_addr_hash(net, addr);
4558 struct inet6_ifaddr *ifp = NULL;
4559 int ret = 0;
4560
4561 rcu_read_lock();
4562 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4563 if (ipv6_addr_equal(&ifp->addr, addr) &&
4564 (ifp->flags & IFA_F_HOMEADDRESS)) {
4565 ret = 1;
4566 break;
4567 }
4568 }
4569 rcu_read_unlock();
4570 return ret;
4571}
4572#endif
4573
4574/* RFC6554 has some algorithm to avoid loops in segment routing by
4575 * checking if the segments contains any of a local interface address.
4576 *
4577 * Quote:
4578 *
4579 * To detect loops in the SRH, a router MUST determine if the SRH
4580 * includes multiple addresses assigned to any interface on that router.
4581 * If such addresses appear more than once and are separated by at least
4582 * one address not assigned to that router.
4583 */
4584int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4585 unsigned char nsegs)
4586{
4587 const struct in6_addr *addr;
4588 int i, ret = 0, found = 0;
4589 struct inet6_ifaddr *ifp;
4590 bool separated = false;
4591 unsigned int hash;
4592 bool hash_found;
4593
4594 rcu_read_lock();
4595 for (i = 0; i < nsegs; i++) {
4596 addr = &segs[i];
4597 hash = inet6_addr_hash(net, addr);
4598
4599 hash_found = false;
4600 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4601
4602 if (ipv6_addr_equal(&ifp->addr, addr)) {
4603 hash_found = true;
4604 break;
4605 }
4606 }
4607
4608 if (hash_found) {
4609 if (found > 1 && separated) {
4610 ret = 1;
4611 break;
4612 }
4613
4614 separated = false;
4615 found++;
4616 } else {
4617 separated = true;
4618 }
4619 }
4620 rcu_read_unlock();
4621
4622 return ret;
4623}
4624
4625/*
4626 * Periodic address status verification
4627 */
4628
4629static void addrconf_verify_rtnl(struct net *net)
4630{
4631 unsigned long now, next, next_sec, next_sched;
4632 struct inet6_ifaddr *ifp;
4633 int i;
4634
4635 ASSERT_RTNL();
4636
4637 rcu_read_lock_bh();
4638 now = jiffies;
4639 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4640
4641 cancel_delayed_work(&net->ipv6.addr_chk_work);
4642
4643 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4644restart:
4645 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) {
4646 unsigned long age;
4647
4648 /* When setting preferred_lft to a value not zero or
4649 * infinity, while valid_lft is infinity
4650 * IFA_F_PERMANENT has a non-infinity life time.
4651 */
4652 if ((ifp->flags & IFA_F_PERMANENT) &&
4653 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4654 continue;
4655
4656 spin_lock(&ifp->lock);
4657 /* We try to batch several events at once. */
4658 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4659
4660 if ((ifp->flags&IFA_F_TEMPORARY) &&
4661 !(ifp->flags&IFA_F_TENTATIVE) &&
4662 ifp->prefered_lft != INFINITY_LIFE_TIME &&
4663 !ifp->regen_count && ifp->ifpub) {
4664 /* This is a non-regenerated temporary addr. */
4665
4666 unsigned long regen_advance = ipv6_get_regen_advance(ifp->idev);
4667
4668 if (age + regen_advance >= ifp->prefered_lft) {
4669 struct inet6_ifaddr *ifpub = ifp->ifpub;
4670 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4671 next = ifp->tstamp + ifp->prefered_lft * HZ;
4672
4673 ifp->regen_count++;
4674 in6_ifa_hold(ifp);
4675 in6_ifa_hold(ifpub);
4676 spin_unlock(&ifp->lock);
4677
4678 spin_lock(&ifpub->lock);
4679 ifpub->regen_count = 0;
4680 spin_unlock(&ifpub->lock);
4681 rcu_read_unlock_bh();
4682 ipv6_create_tempaddr(ifpub, true);
4683 in6_ifa_put(ifpub);
4684 in6_ifa_put(ifp);
4685 rcu_read_lock_bh();
4686 goto restart;
4687 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4688 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4689 }
4690
4691 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4692 age >= ifp->valid_lft) {
4693 spin_unlock(&ifp->lock);
4694 in6_ifa_hold(ifp);
4695 rcu_read_unlock_bh();
4696 ipv6_del_addr(ifp);
4697 rcu_read_lock_bh();
4698 goto restart;
4699 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4700 spin_unlock(&ifp->lock);
4701 continue;
4702 } else if (age >= ifp->prefered_lft) {
4703 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4704 int deprecate = 0;
4705
4706 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4707 deprecate = 1;
4708 ifp->flags |= IFA_F_DEPRECATED;
4709 }
4710
4711 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4712 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4713 next = ifp->tstamp + ifp->valid_lft * HZ;
4714
4715 spin_unlock(&ifp->lock);
4716
4717 if (deprecate) {
4718 in6_ifa_hold(ifp);
4719
4720 ipv6_ifa_notify(0, ifp);
4721 in6_ifa_put(ifp);
4722 goto restart;
4723 }
4724 } else {
4725 /* ifp->prefered_lft <= ifp->valid_lft */
4726 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4727 next = ifp->tstamp + ifp->prefered_lft * HZ;
4728 spin_unlock(&ifp->lock);
4729 }
4730 }
4731 }
4732
4733 next_sec = round_jiffies_up(next);
4734 next_sched = next;
4735
4736 /* If rounded timeout is accurate enough, accept it. */
4737 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4738 next_sched = next_sec;
4739
4740 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4741 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4742 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4743
4744 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4745 now, next, next_sec, next_sched);
4746 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now);
4747 rcu_read_unlock_bh();
4748}
4749
4750static void addrconf_verify_work(struct work_struct *w)
4751{
4752 struct net *net = container_of(to_delayed_work(w), struct net,
4753 ipv6.addr_chk_work);
4754
4755 rtnl_lock();
4756 addrconf_verify_rtnl(net);
4757 rtnl_unlock();
4758}
4759
4760static void addrconf_verify(struct net *net)
4761{
4762 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0);
4763}
4764
4765static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4766 struct in6_addr **peer_pfx)
4767{
4768 struct in6_addr *pfx = NULL;
4769
4770 *peer_pfx = NULL;
4771
4772 if (addr)
4773 pfx = nla_data(addr);
4774
4775 if (local) {
4776 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4777 *peer_pfx = pfx;
4778 pfx = nla_data(local);
4779 }
4780
4781 return pfx;
4782}
4783
4784static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4785 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4786 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4787 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4788 [IFA_FLAGS] = { .len = sizeof(u32) },
4789 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4790 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4791 [IFA_PROTO] = { .type = NLA_U8 },
4792};
4793
4794static int
4795inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4796 struct netlink_ext_ack *extack)
4797{
4798 struct net *net = sock_net(skb->sk);
4799 struct ifaddrmsg *ifm;
4800 struct nlattr *tb[IFA_MAX+1];
4801 struct in6_addr *pfx, *peer_pfx;
4802 u32 ifa_flags;
4803 int err;
4804
4805 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4806 ifa_ipv6_policy, extack);
4807 if (err < 0)
4808 return err;
4809
4810 ifm = nlmsg_data(nlh);
4811 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4812 if (!pfx)
4813 return -EINVAL;
4814
4815 ifa_flags = nla_get_u32_default(tb[IFA_FLAGS], ifm->ifa_flags);
4816
4817 /* We ignore other flags so far. */
4818 ifa_flags &= IFA_F_MANAGETEMPADDR;
4819
4820 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4821 ifm->ifa_prefixlen, extack);
4822}
4823
4824static int modify_prefix_route(struct net *net, struct inet6_ifaddr *ifp,
4825 unsigned long expires, u32 flags,
4826 bool modify_peer)
4827{
4828 struct fib6_table *table;
4829 struct fib6_info *f6i;
4830 u32 prio;
4831
4832 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4833 ifp->prefix_len,
4834 ifp->idev->dev, 0, RTF_DEFAULT, true);
4835 if (!f6i)
4836 return -ENOENT;
4837
4838 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4839 if (f6i->fib6_metric != prio) {
4840 /* delete old one */
4841 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4842
4843 /* add new one */
4844 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4845 ifp->prefix_len,
4846 ifp->rt_priority, ifp->idev->dev,
4847 expires, flags, GFP_KERNEL);
4848 return 0;
4849 }
4850 if (f6i != net->ipv6.fib6_null_entry) {
4851 table = f6i->fib6_table;
4852 spin_lock_bh(&table->tb6_lock);
4853
4854 if (!(flags & RTF_EXPIRES)) {
4855 fib6_clean_expires(f6i);
4856 fib6_remove_gc_list(f6i);
4857 } else {
4858 fib6_set_expires(f6i, expires);
4859 fib6_add_gc_list(f6i);
4860 }
4861
4862 spin_unlock_bh(&table->tb6_lock);
4863 }
4864 fib6_info_release(f6i);
4865
4866 return 0;
4867}
4868
4869static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp,
4870 struct ifa6_config *cfg)
4871{
4872 u32 flags;
4873 clock_t expires;
4874 unsigned long timeout;
4875 bool was_managetempaddr;
4876 bool had_prefixroute;
4877 bool new_peer = false;
4878
4879 ASSERT_RTNL();
4880
4881 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4882 return -EINVAL;
4883
4884 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4885 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4886 return -EINVAL;
4887
4888 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4889 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4890
4891 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4892 if (addrconf_finite_timeout(timeout)) {
4893 expires = jiffies_to_clock_t(timeout * HZ);
4894 cfg->valid_lft = timeout;
4895 flags = RTF_EXPIRES;
4896 } else {
4897 expires = 0;
4898 flags = 0;
4899 cfg->ifa_flags |= IFA_F_PERMANENT;
4900 }
4901
4902 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4903 if (addrconf_finite_timeout(timeout)) {
4904 if (timeout == 0)
4905 cfg->ifa_flags |= IFA_F_DEPRECATED;
4906 cfg->preferred_lft = timeout;
4907 }
4908
4909 if (cfg->peer_pfx &&
4910 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4911 if (!ipv6_addr_any(&ifp->peer_addr))
4912 cleanup_prefix_route(ifp, expires, true, true);
4913 new_peer = true;
4914 }
4915
4916 spin_lock_bh(&ifp->lock);
4917 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4918 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4919 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4920 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4921 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4922 IFA_F_NOPREFIXROUTE);
4923 ifp->flags |= cfg->ifa_flags;
4924 WRITE_ONCE(ifp->tstamp, jiffies);
4925 WRITE_ONCE(ifp->valid_lft, cfg->valid_lft);
4926 WRITE_ONCE(ifp->prefered_lft, cfg->preferred_lft);
4927 WRITE_ONCE(ifp->ifa_proto, cfg->ifa_proto);
4928
4929 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4930 WRITE_ONCE(ifp->rt_priority, cfg->rt_priority);
4931
4932 if (new_peer)
4933 ifp->peer_addr = *cfg->peer_pfx;
4934
4935 spin_unlock_bh(&ifp->lock);
4936 if (!(ifp->flags&IFA_F_TENTATIVE))
4937 ipv6_ifa_notify(0, ifp);
4938
4939 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4940 int rc = -ENOENT;
4941
4942 if (had_prefixroute)
4943 rc = modify_prefix_route(net, ifp, expires, flags, false);
4944
4945 /* prefix route could have been deleted; if so restore it */
4946 if (rc == -ENOENT) {
4947 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4948 ifp->rt_priority, ifp->idev->dev,
4949 expires, flags, GFP_KERNEL);
4950 }
4951
4952 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4953 rc = modify_prefix_route(net, ifp, expires, flags, true);
4954
4955 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4956 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4957 ifp->rt_priority, ifp->idev->dev,
4958 expires, flags, GFP_KERNEL);
4959 }
4960 } else if (had_prefixroute) {
4961 enum cleanup_prefix_rt_t action;
4962 unsigned long rt_expires;
4963
4964 write_lock_bh(&ifp->idev->lock);
4965 action = check_cleanup_prefix_route(ifp, &rt_expires);
4966 write_unlock_bh(&ifp->idev->lock);
4967
4968 if (action != CLEANUP_PREFIX_RT_NOP) {
4969 cleanup_prefix_route(ifp, rt_expires,
4970 action == CLEANUP_PREFIX_RT_DEL, false);
4971 }
4972 }
4973
4974 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4975 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4976 delete_tempaddrs(ifp->idev, ifp);
4977 else
4978 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4979 cfg->preferred_lft, !was_managetempaddr,
4980 jiffies);
4981 }
4982
4983 addrconf_verify_rtnl(net);
4984
4985 return 0;
4986}
4987
4988static int
4989inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4990 struct netlink_ext_ack *extack)
4991{
4992 struct net *net = sock_net(skb->sk);
4993 struct ifaddrmsg *ifm;
4994 struct nlattr *tb[IFA_MAX+1];
4995 struct in6_addr *peer_pfx;
4996 struct inet6_ifaddr *ifa;
4997 struct net_device *dev;
4998 struct inet6_dev *idev;
4999 struct ifa6_config cfg;
5000 int err;
5001
5002 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5003 ifa_ipv6_policy, extack);
5004 if (err < 0)
5005 return err;
5006
5007 memset(&cfg, 0, sizeof(cfg));
5008
5009 ifm = nlmsg_data(nlh);
5010 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
5011 if (!cfg.pfx)
5012 return -EINVAL;
5013
5014 cfg.peer_pfx = peer_pfx;
5015 cfg.plen = ifm->ifa_prefixlen;
5016 if (tb[IFA_RT_PRIORITY])
5017 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
5018
5019 if (tb[IFA_PROTO])
5020 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]);
5021
5022 cfg.valid_lft = INFINITY_LIFE_TIME;
5023 cfg.preferred_lft = INFINITY_LIFE_TIME;
5024
5025 if (tb[IFA_CACHEINFO]) {
5026 struct ifa_cacheinfo *ci;
5027
5028 ci = nla_data(tb[IFA_CACHEINFO]);
5029 cfg.valid_lft = ci->ifa_valid;
5030 cfg.preferred_lft = ci->ifa_prefered;
5031 }
5032
5033 dev = __dev_get_by_index(net, ifm->ifa_index);
5034 if (!dev) {
5035 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
5036 return -ENODEV;
5037 }
5038
5039 cfg.ifa_flags = nla_get_u32_default(tb[IFA_FLAGS], ifm->ifa_flags);
5040
5041 /* We ignore other flags so far. */
5042 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
5043 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
5044 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
5045
5046 idev = ipv6_find_idev(dev);
5047 if (IS_ERR(idev))
5048 return PTR_ERR(idev);
5049
5050 if (!ipv6_allow_optimistic_dad(net, idev))
5051 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
5052
5053 if (cfg.ifa_flags & IFA_F_NODAD &&
5054 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
5055 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
5056 return -EINVAL;
5057 }
5058
5059 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
5060 if (!ifa) {
5061 /*
5062 * It would be best to check for !NLM_F_CREATE here but
5063 * userspace already relies on not having to provide this.
5064 */
5065 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
5066 }
5067
5068 if (nlh->nlmsg_flags & NLM_F_EXCL ||
5069 !(nlh->nlmsg_flags & NLM_F_REPLACE)) {
5070 NL_SET_ERR_MSG_MOD(extack, "address already assigned");
5071 err = -EEXIST;
5072 } else {
5073 err = inet6_addr_modify(net, ifa, &cfg);
5074 }
5075
5076 in6_ifa_put(ifa);
5077
5078 return err;
5079}
5080
5081static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
5082 u8 scope, int ifindex)
5083{
5084 struct ifaddrmsg *ifm;
5085
5086 ifm = nlmsg_data(nlh);
5087 ifm->ifa_family = AF_INET6;
5088 ifm->ifa_prefixlen = prefixlen;
5089 ifm->ifa_flags = flags;
5090 ifm->ifa_scope = scope;
5091 ifm->ifa_index = ifindex;
5092}
5093
5094static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
5095 unsigned long tstamp, u32 preferred, u32 valid)
5096{
5097 struct ifa_cacheinfo ci;
5098
5099 ci.cstamp = cstamp_delta(cstamp);
5100 ci.tstamp = cstamp_delta(tstamp);
5101 ci.ifa_prefered = preferred;
5102 ci.ifa_valid = valid;
5103
5104 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
5105}
5106
5107static inline int rt_scope(int ifa_scope)
5108{
5109 if (ifa_scope & IFA_HOST)
5110 return RT_SCOPE_HOST;
5111 else if (ifa_scope & IFA_LINK)
5112 return RT_SCOPE_LINK;
5113 else if (ifa_scope & IFA_SITE)
5114 return RT_SCOPE_SITE;
5115 else
5116 return RT_SCOPE_UNIVERSE;
5117}
5118
5119static inline int inet6_ifaddr_msgsize(void)
5120{
5121 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
5122 + nla_total_size(16) /* IFA_LOCAL */
5123 + nla_total_size(16) /* IFA_ADDRESS */
5124 + nla_total_size(sizeof(struct ifa_cacheinfo))
5125 + nla_total_size(4) /* IFA_FLAGS */
5126 + nla_total_size(1) /* IFA_PROTO */
5127 + nla_total_size(4) /* IFA_RT_PRIORITY */;
5128}
5129
5130enum addr_type_t {
5131 UNICAST_ADDR,
5132 MULTICAST_ADDR,
5133 ANYCAST_ADDR,
5134};
5135
5136struct inet6_fill_args {
5137 u32 portid;
5138 u32 seq;
5139 int event;
5140 unsigned int flags;
5141 int netnsid;
5142 int ifindex;
5143 enum addr_type_t type;
5144};
5145
5146static int inet6_fill_ifaddr(struct sk_buff *skb,
5147 const struct inet6_ifaddr *ifa,
5148 struct inet6_fill_args *args)
5149{
5150 struct nlmsghdr *nlh;
5151 u32 preferred, valid;
5152 u32 flags, priority;
5153 u8 proto;
5154
5155 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5156 sizeof(struct ifaddrmsg), args->flags);
5157 if (!nlh)
5158 return -EMSGSIZE;
5159
5160 flags = READ_ONCE(ifa->flags);
5161 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
5162 ifa->idev->dev->ifindex);
5163
5164 if (args->netnsid >= 0 &&
5165 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5166 goto error;
5167
5168 preferred = READ_ONCE(ifa->prefered_lft);
5169 valid = READ_ONCE(ifa->valid_lft);
5170
5171 if (!((flags & IFA_F_PERMANENT) &&
5172 (preferred == INFINITY_LIFE_TIME))) {
5173 if (preferred != INFINITY_LIFE_TIME) {
5174 long tval = (jiffies - READ_ONCE(ifa->tstamp)) / HZ;
5175
5176 if (preferred > tval)
5177 preferred -= tval;
5178 else
5179 preferred = 0;
5180 if (valid != INFINITY_LIFE_TIME) {
5181 if (valid > tval)
5182 valid -= tval;
5183 else
5184 valid = 0;
5185 }
5186 }
5187 } else {
5188 preferred = INFINITY_LIFE_TIME;
5189 valid = INFINITY_LIFE_TIME;
5190 }
5191
5192 if (!ipv6_addr_any(&ifa->peer_addr)) {
5193 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5194 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5195 goto error;
5196 } else {
5197 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5198 goto error;
5199 }
5200
5201 priority = READ_ONCE(ifa->rt_priority);
5202 if (priority && nla_put_u32(skb, IFA_RT_PRIORITY, priority))
5203 goto error;
5204
5205 if (put_cacheinfo(skb, ifa->cstamp, READ_ONCE(ifa->tstamp),
5206 preferred, valid) < 0)
5207 goto error;
5208
5209 if (nla_put_u32(skb, IFA_FLAGS, flags) < 0)
5210 goto error;
5211
5212 proto = READ_ONCE(ifa->ifa_proto);
5213 if (proto && nla_put_u8(skb, IFA_PROTO, proto))
5214 goto error;
5215
5216 nlmsg_end(skb, nlh);
5217 return 0;
5218
5219error:
5220 nlmsg_cancel(skb, nlh);
5221 return -EMSGSIZE;
5222}
5223
5224static int inet6_fill_ifmcaddr(struct sk_buff *skb,
5225 const struct ifmcaddr6 *ifmca,
5226 struct inet6_fill_args *args)
5227{
5228 int ifindex = ifmca->idev->dev->ifindex;
5229 u8 scope = RT_SCOPE_UNIVERSE;
5230 struct nlmsghdr *nlh;
5231
5232 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5233 scope = RT_SCOPE_SITE;
5234
5235 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5236 sizeof(struct ifaddrmsg), args->flags);
5237 if (!nlh)
5238 return -EMSGSIZE;
5239
5240 if (args->netnsid >= 0 &&
5241 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5242 nlmsg_cancel(skb, nlh);
5243 return -EMSGSIZE;
5244 }
5245
5246 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5247 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5248 put_cacheinfo(skb, ifmca->mca_cstamp, READ_ONCE(ifmca->mca_tstamp),
5249 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5250 nlmsg_cancel(skb, nlh);
5251 return -EMSGSIZE;
5252 }
5253
5254 nlmsg_end(skb, nlh);
5255 return 0;
5256}
5257
5258static int inet6_fill_ifacaddr(struct sk_buff *skb,
5259 const struct ifacaddr6 *ifaca,
5260 struct inet6_fill_args *args)
5261{
5262 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5263 int ifindex = dev ? dev->ifindex : 1;
5264 u8 scope = RT_SCOPE_UNIVERSE;
5265 struct nlmsghdr *nlh;
5266
5267 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5268 scope = RT_SCOPE_SITE;
5269
5270 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5271 sizeof(struct ifaddrmsg), args->flags);
5272 if (!nlh)
5273 return -EMSGSIZE;
5274
5275 if (args->netnsid >= 0 &&
5276 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5277 nlmsg_cancel(skb, nlh);
5278 return -EMSGSIZE;
5279 }
5280
5281 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5282 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5283 put_cacheinfo(skb, ifaca->aca_cstamp, READ_ONCE(ifaca->aca_tstamp),
5284 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5285 nlmsg_cancel(skb, nlh);
5286 return -EMSGSIZE;
5287 }
5288
5289 nlmsg_end(skb, nlh);
5290 return 0;
5291}
5292
5293/* called with rcu_read_lock() */
5294static int in6_dump_addrs(const struct inet6_dev *idev, struct sk_buff *skb,
5295 struct netlink_callback *cb, int *s_ip_idx,
5296 struct inet6_fill_args *fillargs)
5297{
5298 const struct ifmcaddr6 *ifmca;
5299 const struct ifacaddr6 *ifaca;
5300 int ip_idx = 0;
5301 int err = 0;
5302
5303 switch (fillargs->type) {
5304 case UNICAST_ADDR: {
5305 const struct inet6_ifaddr *ifa;
5306 fillargs->event = RTM_NEWADDR;
5307
5308 /* unicast address incl. temp addr */
5309 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
5310 if (ip_idx < *s_ip_idx)
5311 goto next;
5312 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5313 if (err < 0)
5314 break;
5315 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5316next:
5317 ip_idx++;
5318 }
5319 break;
5320 }
5321 case MULTICAST_ADDR:
5322 fillargs->event = RTM_GETMULTICAST;
5323
5324 /* multicast address */
5325 for (ifmca = rcu_dereference(idev->mc_list);
5326 ifmca;
5327 ifmca = rcu_dereference(ifmca->next), ip_idx++) {
5328 if (ip_idx < *s_ip_idx)
5329 continue;
5330 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5331 if (err < 0)
5332 break;
5333 }
5334 break;
5335 case ANYCAST_ADDR:
5336 fillargs->event = RTM_GETANYCAST;
5337 /* anycast address */
5338 for (ifaca = rcu_dereference(idev->ac_list); ifaca;
5339 ifaca = rcu_dereference(ifaca->aca_next), ip_idx++) {
5340 if (ip_idx < *s_ip_idx)
5341 continue;
5342 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5343 if (err < 0)
5344 break;
5345 }
5346 break;
5347 default:
5348 break;
5349 }
5350 *s_ip_idx = err ? ip_idx : 0;
5351 return err;
5352}
5353
5354static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5355 struct inet6_fill_args *fillargs,
5356 struct net **tgt_net, struct sock *sk,
5357 struct netlink_callback *cb)
5358{
5359 struct netlink_ext_ack *extack = cb->extack;
5360 struct nlattr *tb[IFA_MAX+1];
5361 struct ifaddrmsg *ifm;
5362 int err, i;
5363
5364 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5365 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5366 return -EINVAL;
5367 }
5368
5369 ifm = nlmsg_data(nlh);
5370 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5371 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5372 return -EINVAL;
5373 }
5374
5375 fillargs->ifindex = ifm->ifa_index;
5376 if (fillargs->ifindex) {
5377 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5378 fillargs->flags |= NLM_F_DUMP_FILTERED;
5379 }
5380
5381 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5382 ifa_ipv6_policy, extack);
5383 if (err < 0)
5384 return err;
5385
5386 for (i = 0; i <= IFA_MAX; ++i) {
5387 if (!tb[i])
5388 continue;
5389
5390 if (i == IFA_TARGET_NETNSID) {
5391 struct net *net;
5392
5393 fillargs->netnsid = nla_get_s32(tb[i]);
5394 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5395 if (IS_ERR(net)) {
5396 fillargs->netnsid = -1;
5397 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5398 return PTR_ERR(net);
5399 }
5400 *tgt_net = net;
5401 } else {
5402 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5403 return -EINVAL;
5404 }
5405 }
5406
5407 return 0;
5408}
5409
5410static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5411 enum addr_type_t type)
5412{
5413 struct net *tgt_net = sock_net(skb->sk);
5414 const struct nlmsghdr *nlh = cb->nlh;
5415 struct inet6_fill_args fillargs = {
5416 .portid = NETLINK_CB(cb->skb).portid,
5417 .seq = cb->nlh->nlmsg_seq,
5418 .flags = NLM_F_MULTI,
5419 .netnsid = -1,
5420 .type = type,
5421 };
5422 struct {
5423 unsigned long ifindex;
5424 int ip_idx;
5425 } *ctx = (void *)cb->ctx;
5426 struct net_device *dev;
5427 struct inet6_dev *idev;
5428 int err = 0;
5429
5430 rcu_read_lock();
5431 if (cb->strict_check) {
5432 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5433 skb->sk, cb);
5434 if (err < 0)
5435 goto done;
5436
5437 err = 0;
5438 if (fillargs.ifindex) {
5439 dev = dev_get_by_index_rcu(tgt_net, fillargs.ifindex);
5440 if (!dev) {
5441 err = -ENODEV;
5442 goto done;
5443 }
5444 idev = __in6_dev_get(dev);
5445 if (idev)
5446 err = in6_dump_addrs(idev, skb, cb,
5447 &ctx->ip_idx,
5448 &fillargs);
5449 goto done;
5450 }
5451 }
5452
5453 cb->seq = inet6_base_seq(tgt_net);
5454 for_each_netdev_dump(tgt_net, dev, ctx->ifindex) {
5455 idev = __in6_dev_get(dev);
5456 if (!idev)
5457 continue;
5458 err = in6_dump_addrs(idev, skb, cb, &ctx->ip_idx,
5459 &fillargs);
5460 if (err < 0)
5461 goto done;
5462 }
5463done:
5464 rcu_read_unlock();
5465 if (fillargs.netnsid >= 0)
5466 put_net(tgt_net);
5467
5468 return err;
5469}
5470
5471static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5472{
5473 enum addr_type_t type = UNICAST_ADDR;
5474
5475 return inet6_dump_addr(skb, cb, type);
5476}
5477
5478static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5479{
5480 enum addr_type_t type = MULTICAST_ADDR;
5481
5482 return inet6_dump_addr(skb, cb, type);
5483}
5484
5485
5486static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5487{
5488 enum addr_type_t type = ANYCAST_ADDR;
5489
5490 return inet6_dump_addr(skb, cb, type);
5491}
5492
5493static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5494 const struct nlmsghdr *nlh,
5495 struct nlattr **tb,
5496 struct netlink_ext_ack *extack)
5497{
5498 struct ifaddrmsg *ifm;
5499 int i, err;
5500
5501 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5502 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5503 return -EINVAL;
5504 }
5505
5506 if (!netlink_strict_get_check(skb))
5507 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5508 ifa_ipv6_policy, extack);
5509
5510 ifm = nlmsg_data(nlh);
5511 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5512 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5513 return -EINVAL;
5514 }
5515
5516 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5517 ifa_ipv6_policy, extack);
5518 if (err)
5519 return err;
5520
5521 for (i = 0; i <= IFA_MAX; i++) {
5522 if (!tb[i])
5523 continue;
5524
5525 switch (i) {
5526 case IFA_TARGET_NETNSID:
5527 case IFA_ADDRESS:
5528 case IFA_LOCAL:
5529 break;
5530 default:
5531 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5532 return -EINVAL;
5533 }
5534 }
5535
5536 return 0;
5537}
5538
5539static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5540 struct netlink_ext_ack *extack)
5541{
5542 struct net *tgt_net = sock_net(in_skb->sk);
5543 struct inet6_fill_args fillargs = {
5544 .portid = NETLINK_CB(in_skb).portid,
5545 .seq = nlh->nlmsg_seq,
5546 .event = RTM_NEWADDR,
5547 .flags = 0,
5548 .netnsid = -1,
5549 };
5550 struct ifaddrmsg *ifm;
5551 struct nlattr *tb[IFA_MAX+1];
5552 struct in6_addr *addr = NULL, *peer;
5553 struct net_device *dev = NULL;
5554 struct inet6_ifaddr *ifa;
5555 struct sk_buff *skb;
5556 int err;
5557
5558 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5559 if (err < 0)
5560 return err;
5561
5562 if (tb[IFA_TARGET_NETNSID]) {
5563 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5564
5565 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5566 fillargs.netnsid);
5567 if (IS_ERR(tgt_net))
5568 return PTR_ERR(tgt_net);
5569 }
5570
5571 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5572 if (!addr) {
5573 err = -EINVAL;
5574 goto errout;
5575 }
5576 ifm = nlmsg_data(nlh);
5577 if (ifm->ifa_index)
5578 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5579
5580 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5581 if (!ifa) {
5582 err = -EADDRNOTAVAIL;
5583 goto errout;
5584 }
5585
5586 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5587 if (!skb) {
5588 err = -ENOBUFS;
5589 goto errout_ifa;
5590 }
5591
5592 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5593 if (err < 0) {
5594 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5595 WARN_ON(err == -EMSGSIZE);
5596 kfree_skb(skb);
5597 goto errout_ifa;
5598 }
5599 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5600errout_ifa:
5601 in6_ifa_put(ifa);
5602errout:
5603 dev_put(dev);
5604 if (fillargs.netnsid >= 0)
5605 put_net(tgt_net);
5606
5607 return err;
5608}
5609
5610static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5611{
5612 struct sk_buff *skb;
5613 struct net *net = dev_net(ifa->idev->dev);
5614 struct inet6_fill_args fillargs = {
5615 .portid = 0,
5616 .seq = 0,
5617 .event = event,
5618 .flags = 0,
5619 .netnsid = -1,
5620 };
5621 int err = -ENOBUFS;
5622
5623 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5624 if (!skb)
5625 goto errout;
5626
5627 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5628 if (err < 0) {
5629 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5630 WARN_ON(err == -EMSGSIZE);
5631 kfree_skb(skb);
5632 goto errout;
5633 }
5634 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5635 return;
5636errout:
5637 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5638}
5639
5640static void ipv6_store_devconf(const struct ipv6_devconf *cnf,
5641 __s32 *array, int bytes)
5642{
5643 BUG_ON(bytes < (DEVCONF_MAX * 4));
5644
5645 memset(array, 0, bytes);
5646 array[DEVCONF_FORWARDING] = READ_ONCE(cnf->forwarding);
5647 array[DEVCONF_HOPLIMIT] = READ_ONCE(cnf->hop_limit);
5648 array[DEVCONF_MTU6] = READ_ONCE(cnf->mtu6);
5649 array[DEVCONF_ACCEPT_RA] = READ_ONCE(cnf->accept_ra);
5650 array[DEVCONF_ACCEPT_REDIRECTS] = READ_ONCE(cnf->accept_redirects);
5651 array[DEVCONF_AUTOCONF] = READ_ONCE(cnf->autoconf);
5652 array[DEVCONF_DAD_TRANSMITS] = READ_ONCE(cnf->dad_transmits);
5653 array[DEVCONF_RTR_SOLICITS] = READ_ONCE(cnf->rtr_solicits);
5654 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5655 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_interval));
5656 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5657 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_max_interval));
5658 array[DEVCONF_RTR_SOLICIT_DELAY] =
5659 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_delay));
5660 array[DEVCONF_FORCE_MLD_VERSION] = READ_ONCE(cnf->force_mld_version);
5661 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5662 jiffies_to_msecs(READ_ONCE(cnf->mldv1_unsolicited_report_interval));
5663 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5664 jiffies_to_msecs(READ_ONCE(cnf->mldv2_unsolicited_report_interval));
5665 array[DEVCONF_USE_TEMPADDR] = READ_ONCE(cnf->use_tempaddr);
5666 array[DEVCONF_TEMP_VALID_LFT] = READ_ONCE(cnf->temp_valid_lft);
5667 array[DEVCONF_TEMP_PREFERED_LFT] = READ_ONCE(cnf->temp_prefered_lft);
5668 array[DEVCONF_REGEN_MAX_RETRY] = READ_ONCE(cnf->regen_max_retry);
5669 array[DEVCONF_MAX_DESYNC_FACTOR] = READ_ONCE(cnf->max_desync_factor);
5670 array[DEVCONF_MAX_ADDRESSES] = READ_ONCE(cnf->max_addresses);
5671 array[DEVCONF_ACCEPT_RA_DEFRTR] = READ_ONCE(cnf->accept_ra_defrtr);
5672 array[DEVCONF_RA_DEFRTR_METRIC] = READ_ONCE(cnf->ra_defrtr_metric);
5673 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] =
5674 READ_ONCE(cnf->accept_ra_min_hop_limit);
5675 array[DEVCONF_ACCEPT_RA_PINFO] = READ_ONCE(cnf->accept_ra_pinfo);
5676#ifdef CONFIG_IPV6_ROUTER_PREF
5677 array[DEVCONF_ACCEPT_RA_RTR_PREF] = READ_ONCE(cnf->accept_ra_rtr_pref);
5678 array[DEVCONF_RTR_PROBE_INTERVAL] =
5679 jiffies_to_msecs(READ_ONCE(cnf->rtr_probe_interval));
5680#ifdef CONFIG_IPV6_ROUTE_INFO
5681 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] =
5682 READ_ONCE(cnf->accept_ra_rt_info_min_plen);
5683 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] =
5684 READ_ONCE(cnf->accept_ra_rt_info_max_plen);
5685#endif
5686#endif
5687 array[DEVCONF_PROXY_NDP] = READ_ONCE(cnf->proxy_ndp);
5688 array[DEVCONF_ACCEPT_SOURCE_ROUTE] =
5689 READ_ONCE(cnf->accept_source_route);
5690#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5691 array[DEVCONF_OPTIMISTIC_DAD] = READ_ONCE(cnf->optimistic_dad);
5692 array[DEVCONF_USE_OPTIMISTIC] = READ_ONCE(cnf->use_optimistic);
5693#endif
5694#ifdef CONFIG_IPV6_MROUTE
5695 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5696#endif
5697 array[DEVCONF_DISABLE_IPV6] = READ_ONCE(cnf->disable_ipv6);
5698 array[DEVCONF_ACCEPT_DAD] = READ_ONCE(cnf->accept_dad);
5699 array[DEVCONF_FORCE_TLLAO] = READ_ONCE(cnf->force_tllao);
5700 array[DEVCONF_NDISC_NOTIFY] = READ_ONCE(cnf->ndisc_notify);
5701 array[DEVCONF_SUPPRESS_FRAG_NDISC] =
5702 READ_ONCE(cnf->suppress_frag_ndisc);
5703 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] =
5704 READ_ONCE(cnf->accept_ra_from_local);
5705 array[DEVCONF_ACCEPT_RA_MTU] = READ_ONCE(cnf->accept_ra_mtu);
5706 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] =
5707 READ_ONCE(cnf->ignore_routes_with_linkdown);
5708 /* we omit DEVCONF_STABLE_SECRET for now */
5709 array[DEVCONF_USE_OIF_ADDRS_ONLY] = READ_ONCE(cnf->use_oif_addrs_only);
5710 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] =
5711 READ_ONCE(cnf->drop_unicast_in_l2_multicast);
5712 array[DEVCONF_DROP_UNSOLICITED_NA] = READ_ONCE(cnf->drop_unsolicited_na);
5713 array[DEVCONF_KEEP_ADDR_ON_DOWN] = READ_ONCE(cnf->keep_addr_on_down);
5714 array[DEVCONF_SEG6_ENABLED] = READ_ONCE(cnf->seg6_enabled);
5715#ifdef CONFIG_IPV6_SEG6_HMAC
5716 array[DEVCONF_SEG6_REQUIRE_HMAC] = READ_ONCE(cnf->seg6_require_hmac);
5717#endif
5718 array[DEVCONF_ENHANCED_DAD] = READ_ONCE(cnf->enhanced_dad);
5719 array[DEVCONF_ADDR_GEN_MODE] = READ_ONCE(cnf->addr_gen_mode);
5720 array[DEVCONF_DISABLE_POLICY] = READ_ONCE(cnf->disable_policy);
5721 array[DEVCONF_NDISC_TCLASS] = READ_ONCE(cnf->ndisc_tclass);
5722 array[DEVCONF_RPL_SEG_ENABLED] = READ_ONCE(cnf->rpl_seg_enabled);
5723 array[DEVCONF_IOAM6_ENABLED] = READ_ONCE(cnf->ioam6_enabled);
5724 array[DEVCONF_IOAM6_ID] = READ_ONCE(cnf->ioam6_id);
5725 array[DEVCONF_IOAM6_ID_WIDE] = READ_ONCE(cnf->ioam6_id_wide);
5726 array[DEVCONF_NDISC_EVICT_NOCARRIER] =
5727 READ_ONCE(cnf->ndisc_evict_nocarrier);
5728 array[DEVCONF_ACCEPT_UNTRACKED_NA] =
5729 READ_ONCE(cnf->accept_untracked_na);
5730 array[DEVCONF_ACCEPT_RA_MIN_LFT] = READ_ONCE(cnf->accept_ra_min_lft);
5731}
5732
5733static inline size_t inet6_ifla6_size(void)
5734{
5735 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5736 + nla_total_size(sizeof(struct ifla_cacheinfo))
5737 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5738 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5739 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5740 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5741 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5742 + nla_total_size(4) /* IFLA_INET6_RA_MTU */
5743 + 0;
5744}
5745
5746static inline size_t inet6_if_nlmsg_size(void)
5747{
5748 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5749 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5750 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5751 + nla_total_size(4) /* IFLA_MTU */
5752 + nla_total_size(4) /* IFLA_LINK */
5753 + nla_total_size(1) /* IFLA_OPERSTATE */
5754 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5755}
5756
5757static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5758 int bytes)
5759{
5760 int i;
5761 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5762 BUG_ON(pad < 0);
5763
5764 /* Use put_unaligned() because stats may not be aligned for u64. */
5765 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5766 for (i = 1; i < ICMP6_MIB_MAX; i++)
5767 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5768
5769 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5770}
5771
5772static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5773 int bytes, size_t syncpoff)
5774{
5775 int i, c;
5776 u64 buff[IPSTATS_MIB_MAX];
5777 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5778
5779 BUG_ON(pad < 0);
5780
5781 memset(buff, 0, sizeof(buff));
5782 buff[0] = IPSTATS_MIB_MAX;
5783
5784 for_each_possible_cpu(c) {
5785 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5786 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5787 }
5788
5789 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5790 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5791}
5792
5793static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5794 int bytes)
5795{
5796 switch (attrtype) {
5797 case IFLA_INET6_STATS:
5798 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5799 offsetof(struct ipstats_mib, syncp));
5800 break;
5801 case IFLA_INET6_ICMP6STATS:
5802 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5803 break;
5804 }
5805}
5806
5807static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5808 u32 ext_filter_mask)
5809{
5810 struct ifla_cacheinfo ci;
5811 struct nlattr *nla;
5812 u32 ra_mtu;
5813
5814 if (nla_put_u32(skb, IFLA_INET6_FLAGS, READ_ONCE(idev->if_flags)))
5815 goto nla_put_failure;
5816 ci.max_reasm_len = IPV6_MAXPLEN;
5817 ci.tstamp = cstamp_delta(READ_ONCE(idev->tstamp));
5818 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5819 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5820 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5821 goto nla_put_failure;
5822 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5823 if (!nla)
5824 goto nla_put_failure;
5825 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5826
5827 /* XXX - MC not implemented */
5828
5829 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5830 return 0;
5831
5832 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5833 if (!nla)
5834 goto nla_put_failure;
5835 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5836
5837 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5838 if (!nla)
5839 goto nla_put_failure;
5840 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5841
5842 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5843 if (!nla)
5844 goto nla_put_failure;
5845 read_lock_bh(&idev->lock);
5846 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5847 read_unlock_bh(&idev->lock);
5848
5849 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE,
5850 READ_ONCE(idev->cnf.addr_gen_mode)))
5851 goto nla_put_failure;
5852
5853 ra_mtu = READ_ONCE(idev->ra_mtu);
5854 if (ra_mtu && nla_put_u32(skb, IFLA_INET6_RA_MTU, ra_mtu))
5855 goto nla_put_failure;
5856
5857 return 0;
5858
5859nla_put_failure:
5860 return -EMSGSIZE;
5861}
5862
5863static size_t inet6_get_link_af_size(const struct net_device *dev,
5864 u32 ext_filter_mask)
5865{
5866 if (!__in6_dev_get(dev))
5867 return 0;
5868
5869 return inet6_ifla6_size();
5870}
5871
5872static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5873 u32 ext_filter_mask)
5874{
5875 struct inet6_dev *idev = __in6_dev_get(dev);
5876
5877 if (!idev)
5878 return -ENODATA;
5879
5880 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5881 return -EMSGSIZE;
5882
5883 return 0;
5884}
5885
5886static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5887 struct netlink_ext_ack *extack)
5888{
5889 struct inet6_ifaddr *ifp;
5890 struct net_device *dev = idev->dev;
5891 bool clear_token, update_rs = false;
5892 struct in6_addr ll_addr;
5893
5894 ASSERT_RTNL();
5895
5896 if (!token)
5897 return -EINVAL;
5898
5899 if (dev->flags & IFF_LOOPBACK) {
5900 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
5901 return -EINVAL;
5902 }
5903
5904 if (dev->flags & IFF_NOARP) {
5905 NL_SET_ERR_MSG_MOD(extack,
5906 "Device does not do neighbour discovery");
5907 return -EINVAL;
5908 }
5909
5910 if (!ipv6_accept_ra(idev)) {
5911 NL_SET_ERR_MSG_MOD(extack,
5912 "Router advertisement is disabled on device");
5913 return -EINVAL;
5914 }
5915
5916 if (READ_ONCE(idev->cnf.rtr_solicits) == 0) {
5917 NL_SET_ERR_MSG(extack,
5918 "Router solicitation is disabled on device");
5919 return -EINVAL;
5920 }
5921
5922 write_lock_bh(&idev->lock);
5923
5924 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5925 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5926
5927 write_unlock_bh(&idev->lock);
5928
5929 clear_token = ipv6_addr_any(token);
5930 if (clear_token)
5931 goto update_lft;
5932
5933 if (!idev->dead && (idev->if_flags & IF_READY) &&
5934 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5935 IFA_F_OPTIMISTIC)) {
5936 /* If we're not ready, then normal ifup will take care
5937 * of this. Otherwise, we need to request our rs here.
5938 */
5939 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5940 update_rs = true;
5941 }
5942
5943update_lft:
5944 write_lock_bh(&idev->lock);
5945
5946 if (update_rs) {
5947 idev->if_flags |= IF_RS_SENT;
5948 idev->rs_interval = rfc3315_s14_backoff_init(
5949 READ_ONCE(idev->cnf.rtr_solicit_interval));
5950 idev->rs_probes = 1;
5951 addrconf_mod_rs_timer(idev, idev->rs_interval);
5952 }
5953
5954 /* Well, that's kinda nasty ... */
5955 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5956 spin_lock(&ifp->lock);
5957 if (ifp->tokenized) {
5958 ifp->valid_lft = 0;
5959 ifp->prefered_lft = 0;
5960 }
5961 spin_unlock(&ifp->lock);
5962 }
5963
5964 write_unlock_bh(&idev->lock);
5965 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5966 addrconf_verify_rtnl(dev_net(dev));
5967 return 0;
5968}
5969
5970static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5971 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5972 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5973 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT,
5974 .reject_message =
5975 "IFLA_INET6_RA_MTU can not be set" },
5976};
5977
5978static int check_addr_gen_mode(int mode)
5979{
5980 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5981 mode != IN6_ADDR_GEN_MODE_NONE &&
5982 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5983 mode != IN6_ADDR_GEN_MODE_RANDOM)
5984 return -EINVAL;
5985 return 1;
5986}
5987
5988static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5989 int mode)
5990{
5991 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5992 !idev->cnf.stable_secret.initialized &&
5993 !net->ipv6.devconf_dflt->stable_secret.initialized)
5994 return -EINVAL;
5995 return 1;
5996}
5997
5998static int inet6_validate_link_af(const struct net_device *dev,
5999 const struct nlattr *nla,
6000 struct netlink_ext_ack *extack)
6001{
6002 struct nlattr *tb[IFLA_INET6_MAX + 1];
6003 struct inet6_dev *idev = NULL;
6004 int err;
6005
6006 if (dev) {
6007 idev = __in6_dev_get(dev);
6008 if (!idev)
6009 return -EAFNOSUPPORT;
6010 }
6011
6012 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
6013 inet6_af_policy, extack);
6014 if (err)
6015 return err;
6016
6017 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
6018 return -EINVAL;
6019
6020 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
6021 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
6022
6023 if (check_addr_gen_mode(mode) < 0)
6024 return -EINVAL;
6025 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
6026 return -EINVAL;
6027 }
6028
6029 return 0;
6030}
6031
6032static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
6033 struct netlink_ext_ack *extack)
6034{
6035 struct inet6_dev *idev = __in6_dev_get(dev);
6036 struct nlattr *tb[IFLA_INET6_MAX + 1];
6037 int err;
6038
6039 if (!idev)
6040 return -EAFNOSUPPORT;
6041
6042 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
6043 return -EINVAL;
6044
6045 if (tb[IFLA_INET6_TOKEN]) {
6046 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
6047 extack);
6048 if (err)
6049 return err;
6050 }
6051
6052 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
6053 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
6054
6055 WRITE_ONCE(idev->cnf.addr_gen_mode, mode);
6056 }
6057
6058 return 0;
6059}
6060
6061static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
6062 u32 portid, u32 seq, int event, unsigned int flags)
6063{
6064 struct net_device *dev = idev->dev;
6065 struct ifinfomsg *hdr;
6066 struct nlmsghdr *nlh;
6067 int ifindex, iflink;
6068 void *protoinfo;
6069
6070 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
6071 if (!nlh)
6072 return -EMSGSIZE;
6073
6074 hdr = nlmsg_data(nlh);
6075 hdr->ifi_family = AF_INET6;
6076 hdr->__ifi_pad = 0;
6077 hdr->ifi_type = dev->type;
6078 ifindex = READ_ONCE(dev->ifindex);
6079 hdr->ifi_index = ifindex;
6080 hdr->ifi_flags = dev_get_flags(dev);
6081 hdr->ifi_change = 0;
6082
6083 iflink = dev_get_iflink(dev);
6084 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
6085 (dev->addr_len &&
6086 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
6087 nla_put_u32(skb, IFLA_MTU, READ_ONCE(dev->mtu)) ||
6088 (ifindex != iflink &&
6089 nla_put_u32(skb, IFLA_LINK, iflink)) ||
6090 nla_put_u8(skb, IFLA_OPERSTATE,
6091 netif_running(dev) ? READ_ONCE(dev->operstate) : IF_OPER_DOWN))
6092 goto nla_put_failure;
6093 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
6094 if (!protoinfo)
6095 goto nla_put_failure;
6096
6097 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
6098 goto nla_put_failure;
6099
6100 nla_nest_end(skb, protoinfo);
6101 nlmsg_end(skb, nlh);
6102 return 0;
6103
6104nla_put_failure:
6105 nlmsg_cancel(skb, nlh);
6106 return -EMSGSIZE;
6107}
6108
6109static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
6110 struct netlink_ext_ack *extack)
6111{
6112 struct ifinfomsg *ifm;
6113
6114 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
6115 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
6116 return -EINVAL;
6117 }
6118
6119 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
6120 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
6121 return -EINVAL;
6122 }
6123
6124 ifm = nlmsg_data(nlh);
6125 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
6126 ifm->ifi_change || ifm->ifi_index) {
6127 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
6128 return -EINVAL;
6129 }
6130
6131 return 0;
6132}
6133
6134static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
6135{
6136 struct net *net = sock_net(skb->sk);
6137 struct {
6138 unsigned long ifindex;
6139 } *ctx = (void *)cb->ctx;
6140 struct net_device *dev;
6141 struct inet6_dev *idev;
6142 int err;
6143
6144 /* only requests using strict checking can pass data to
6145 * influence the dump
6146 */
6147 if (cb->strict_check) {
6148 err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
6149
6150 if (err < 0)
6151 return err;
6152 }
6153
6154 err = 0;
6155 rcu_read_lock();
6156 for_each_netdev_dump(net, dev, ctx->ifindex) {
6157 idev = __in6_dev_get(dev);
6158 if (!idev)
6159 continue;
6160 err = inet6_fill_ifinfo(skb, idev,
6161 NETLINK_CB(cb->skb).portid,
6162 cb->nlh->nlmsg_seq,
6163 RTM_NEWLINK, NLM_F_MULTI);
6164 if (err < 0)
6165 break;
6166 }
6167 rcu_read_unlock();
6168
6169 return err;
6170}
6171
6172void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
6173{
6174 struct sk_buff *skb;
6175 struct net *net = dev_net(idev->dev);
6176 int err = -ENOBUFS;
6177
6178 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
6179 if (!skb)
6180 goto errout;
6181
6182 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
6183 if (err < 0) {
6184 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
6185 WARN_ON(err == -EMSGSIZE);
6186 kfree_skb(skb);
6187 goto errout;
6188 }
6189 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
6190 return;
6191errout:
6192 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
6193}
6194
6195static inline size_t inet6_prefix_nlmsg_size(void)
6196{
6197 return NLMSG_ALIGN(sizeof(struct prefixmsg))
6198 + nla_total_size(sizeof(struct in6_addr))
6199 + nla_total_size(sizeof(struct prefix_cacheinfo));
6200}
6201
6202static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6203 struct prefix_info *pinfo, u32 portid, u32 seq,
6204 int event, unsigned int flags)
6205{
6206 struct prefixmsg *pmsg;
6207 struct nlmsghdr *nlh;
6208 struct prefix_cacheinfo ci;
6209
6210 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6211 if (!nlh)
6212 return -EMSGSIZE;
6213
6214 pmsg = nlmsg_data(nlh);
6215 pmsg->prefix_family = AF_INET6;
6216 pmsg->prefix_pad1 = 0;
6217 pmsg->prefix_pad2 = 0;
6218 pmsg->prefix_ifindex = idev->dev->ifindex;
6219 pmsg->prefix_len = pinfo->prefix_len;
6220 pmsg->prefix_type = pinfo->type;
6221 pmsg->prefix_pad3 = 0;
6222 pmsg->prefix_flags = pinfo->flags;
6223
6224 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6225 goto nla_put_failure;
6226 ci.preferred_time = ntohl(pinfo->prefered);
6227 ci.valid_time = ntohl(pinfo->valid);
6228 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6229 goto nla_put_failure;
6230 nlmsg_end(skb, nlh);
6231 return 0;
6232
6233nla_put_failure:
6234 nlmsg_cancel(skb, nlh);
6235 return -EMSGSIZE;
6236}
6237
6238static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6239 struct prefix_info *pinfo)
6240{
6241 struct sk_buff *skb;
6242 struct net *net = dev_net(idev->dev);
6243 int err = -ENOBUFS;
6244
6245 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6246 if (!skb)
6247 goto errout;
6248
6249 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6250 if (err < 0) {
6251 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6252 WARN_ON(err == -EMSGSIZE);
6253 kfree_skb(skb);
6254 goto errout;
6255 }
6256 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6257 return;
6258errout:
6259 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6260}
6261
6262static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6263{
6264 struct net *net = dev_net(ifp->idev->dev);
6265
6266 if (event)
6267 ASSERT_RTNL();
6268
6269 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6270
6271 switch (event) {
6272 case RTM_NEWADDR:
6273 /*
6274 * If the address was optimistic we inserted the route at the
6275 * start of our DAD process, so we don't need to do it again.
6276 * If the device was taken down in the middle of the DAD
6277 * cycle there is a race where we could get here without a
6278 * host route, so nothing to insert. That will be fixed when
6279 * the device is brought up.
6280 */
6281 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6282 ip6_ins_rt(net, ifp->rt);
6283 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6284 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6285 &ifp->addr, ifp->idev->dev->name);
6286 }
6287
6288 if (ifp->idev->cnf.forwarding)
6289 addrconf_join_anycast(ifp);
6290 if (!ipv6_addr_any(&ifp->peer_addr))
6291 addrconf_prefix_route(&ifp->peer_addr, 128,
6292 ifp->rt_priority, ifp->idev->dev,
6293 0, 0, GFP_ATOMIC);
6294 break;
6295 case RTM_DELADDR:
6296 if (ifp->idev->cnf.forwarding)
6297 addrconf_leave_anycast(ifp);
6298 addrconf_leave_solict(ifp->idev, &ifp->addr);
6299 if (!ipv6_addr_any(&ifp->peer_addr)) {
6300 struct fib6_info *rt;
6301
6302 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6303 ifp->idev->dev, 0, 0,
6304 false);
6305 if (rt)
6306 ip6_del_rt(net, rt, false);
6307 }
6308 if (ifp->rt) {
6309 ip6_del_rt(net, ifp->rt, false);
6310 ifp->rt = NULL;
6311 }
6312 rt_genid_bump_ipv6(net);
6313 break;
6314 }
6315 atomic_inc(&net->ipv6.dev_addr_genid);
6316}
6317
6318static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6319{
6320 if (likely(ifp->idev->dead == 0))
6321 __ipv6_ifa_notify(event, ifp);
6322}
6323
6324#ifdef CONFIG_SYSCTL
6325
6326static int addrconf_sysctl_forward(const struct ctl_table *ctl, int write,
6327 void *buffer, size_t *lenp, loff_t *ppos)
6328{
6329 int *valp = ctl->data;
6330 int val = *valp;
6331 loff_t pos = *ppos;
6332 struct ctl_table lctl;
6333 int ret;
6334
6335 /*
6336 * ctl->data points to idev->cnf.forwarding, we should
6337 * not modify it until we get the rtnl lock.
6338 */
6339 lctl = *ctl;
6340 lctl.data = &val;
6341
6342 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6343
6344 if (write)
6345 ret = addrconf_fixup_forwarding(ctl, valp, val);
6346 if (ret)
6347 *ppos = pos;
6348 return ret;
6349}
6350
6351static int addrconf_sysctl_mtu(const struct ctl_table *ctl, int write,
6352 void *buffer, size_t *lenp, loff_t *ppos)
6353{
6354 struct inet6_dev *idev = ctl->extra1;
6355 int min_mtu = IPV6_MIN_MTU;
6356 struct ctl_table lctl;
6357
6358 lctl = *ctl;
6359 lctl.extra1 = &min_mtu;
6360 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6361
6362 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6363}
6364
6365static void dev_disable_change(struct inet6_dev *idev)
6366{
6367 struct netdev_notifier_info info;
6368
6369 if (!idev || !idev->dev)
6370 return;
6371
6372 netdev_notifier_info_init(&info, idev->dev);
6373 if (idev->cnf.disable_ipv6)
6374 addrconf_notify(NULL, NETDEV_DOWN, &info);
6375 else
6376 addrconf_notify(NULL, NETDEV_UP, &info);
6377}
6378
6379static void addrconf_disable_change(struct net *net, __s32 newf)
6380{
6381 struct net_device *dev;
6382 struct inet6_dev *idev;
6383
6384 for_each_netdev(net, dev) {
6385 idev = __in6_dev_get(dev);
6386 if (idev) {
6387 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6388
6389 WRITE_ONCE(idev->cnf.disable_ipv6, newf);
6390 if (changed)
6391 dev_disable_change(idev);
6392 }
6393 }
6394}
6395
6396static int addrconf_disable_ipv6(const struct ctl_table *table, int *p, int newf)
6397{
6398 struct net *net = (struct net *)table->extra2;
6399 int old;
6400
6401 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6402 WRITE_ONCE(*p, newf);
6403 return 0;
6404 }
6405
6406 if (!rtnl_trylock())
6407 return restart_syscall();
6408
6409 old = *p;
6410 WRITE_ONCE(*p, newf);
6411
6412 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6413 WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf);
6414 addrconf_disable_change(net, newf);
6415 } else if ((!newf) ^ (!old))
6416 dev_disable_change((struct inet6_dev *)table->extra1);
6417
6418 rtnl_unlock();
6419 return 0;
6420}
6421
6422static int addrconf_sysctl_disable(const struct ctl_table *ctl, int write,
6423 void *buffer, size_t *lenp, loff_t *ppos)
6424{
6425 int *valp = ctl->data;
6426 int val = *valp;
6427 loff_t pos = *ppos;
6428 struct ctl_table lctl;
6429 int ret;
6430
6431 /*
6432 * ctl->data points to idev->cnf.disable_ipv6, we should
6433 * not modify it until we get the rtnl lock.
6434 */
6435 lctl = *ctl;
6436 lctl.data = &val;
6437
6438 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6439
6440 if (write)
6441 ret = addrconf_disable_ipv6(ctl, valp, val);
6442 if (ret)
6443 *ppos = pos;
6444 return ret;
6445}
6446
6447static int addrconf_sysctl_proxy_ndp(const struct ctl_table *ctl, int write,
6448 void *buffer, size_t *lenp, loff_t *ppos)
6449{
6450 int *valp = ctl->data;
6451 int ret;
6452 int old, new;
6453
6454 old = *valp;
6455 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6456 new = *valp;
6457
6458 if (write && old != new) {
6459 struct net *net = ctl->extra2;
6460
6461 if (!rtnl_trylock())
6462 return restart_syscall();
6463
6464 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6465 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6466 NETCONFA_PROXY_NEIGH,
6467 NETCONFA_IFINDEX_DEFAULT,
6468 net->ipv6.devconf_dflt);
6469 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6470 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6471 NETCONFA_PROXY_NEIGH,
6472 NETCONFA_IFINDEX_ALL,
6473 net->ipv6.devconf_all);
6474 else {
6475 struct inet6_dev *idev = ctl->extra1;
6476
6477 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6478 NETCONFA_PROXY_NEIGH,
6479 idev->dev->ifindex,
6480 &idev->cnf);
6481 }
6482 rtnl_unlock();
6483 }
6484
6485 return ret;
6486}
6487
6488static int addrconf_sysctl_addr_gen_mode(const struct ctl_table *ctl, int write,
6489 void *buffer, size_t *lenp,
6490 loff_t *ppos)
6491{
6492 int ret = 0;
6493 u32 new_val;
6494 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6495 struct net *net = (struct net *)ctl->extra2;
6496 struct ctl_table tmp = {
6497 .data = &new_val,
6498 .maxlen = sizeof(new_val),
6499 .mode = ctl->mode,
6500 };
6501
6502 if (!rtnl_trylock())
6503 return restart_syscall();
6504
6505 new_val = *((u32 *)ctl->data);
6506
6507 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6508 if (ret != 0)
6509 goto out;
6510
6511 if (write) {
6512 if (check_addr_gen_mode(new_val) < 0) {
6513 ret = -EINVAL;
6514 goto out;
6515 }
6516
6517 if (idev) {
6518 if (check_stable_privacy(idev, net, new_val) < 0) {
6519 ret = -EINVAL;
6520 goto out;
6521 }
6522
6523 if (idev->cnf.addr_gen_mode != new_val) {
6524 WRITE_ONCE(idev->cnf.addr_gen_mode, new_val);
6525 addrconf_init_auto_addrs(idev->dev);
6526 }
6527 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6528 struct net_device *dev;
6529
6530 WRITE_ONCE(net->ipv6.devconf_dflt->addr_gen_mode, new_val);
6531 for_each_netdev(net, dev) {
6532 idev = __in6_dev_get(dev);
6533 if (idev &&
6534 idev->cnf.addr_gen_mode != new_val) {
6535 WRITE_ONCE(idev->cnf.addr_gen_mode,
6536 new_val);
6537 addrconf_init_auto_addrs(idev->dev);
6538 }
6539 }
6540 }
6541
6542 WRITE_ONCE(*((u32 *)ctl->data), new_val);
6543 }
6544
6545out:
6546 rtnl_unlock();
6547
6548 return ret;
6549}
6550
6551static int addrconf_sysctl_stable_secret(const struct ctl_table *ctl, int write,
6552 void *buffer, size_t *lenp,
6553 loff_t *ppos)
6554{
6555 int err;
6556 struct in6_addr addr;
6557 char str[IPV6_MAX_STRLEN];
6558 struct ctl_table lctl = *ctl;
6559 struct net *net = ctl->extra2;
6560 struct ipv6_stable_secret *secret = ctl->data;
6561
6562 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6563 return -EIO;
6564
6565 lctl.maxlen = IPV6_MAX_STRLEN;
6566 lctl.data = str;
6567
6568 if (!rtnl_trylock())
6569 return restart_syscall();
6570
6571 if (!write && !secret->initialized) {
6572 err = -EIO;
6573 goto out;
6574 }
6575
6576 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6577 if (err >= sizeof(str)) {
6578 err = -EIO;
6579 goto out;
6580 }
6581
6582 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6583 if (err || !write)
6584 goto out;
6585
6586 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6587 err = -EIO;
6588 goto out;
6589 }
6590
6591 secret->initialized = true;
6592 secret->secret = addr;
6593
6594 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6595 struct net_device *dev;
6596
6597 for_each_netdev(net, dev) {
6598 struct inet6_dev *idev = __in6_dev_get(dev);
6599
6600 if (idev) {
6601 WRITE_ONCE(idev->cnf.addr_gen_mode,
6602 IN6_ADDR_GEN_MODE_STABLE_PRIVACY);
6603 }
6604 }
6605 } else {
6606 struct inet6_dev *idev = ctl->extra1;
6607
6608 WRITE_ONCE(idev->cnf.addr_gen_mode,
6609 IN6_ADDR_GEN_MODE_STABLE_PRIVACY);
6610 }
6611
6612out:
6613 rtnl_unlock();
6614
6615 return err;
6616}
6617
6618static
6619int addrconf_sysctl_ignore_routes_with_linkdown(const struct ctl_table *ctl,
6620 int write, void *buffer,
6621 size_t *lenp,
6622 loff_t *ppos)
6623{
6624 int *valp = ctl->data;
6625 int val = *valp;
6626 loff_t pos = *ppos;
6627 struct ctl_table lctl;
6628 int ret;
6629
6630 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6631 * we should not modify it until we get the rtnl lock.
6632 */
6633 lctl = *ctl;
6634 lctl.data = &val;
6635
6636 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6637
6638 if (write)
6639 ret = addrconf_fixup_linkdown(ctl, valp, val);
6640 if (ret)
6641 *ppos = pos;
6642 return ret;
6643}
6644
6645static
6646void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6647{
6648 if (rt) {
6649 if (action)
6650 rt->dst.flags |= DST_NOPOLICY;
6651 else
6652 rt->dst.flags &= ~DST_NOPOLICY;
6653 }
6654}
6655
6656static
6657void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6658{
6659 struct inet6_ifaddr *ifa;
6660
6661 read_lock_bh(&idev->lock);
6662 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6663 spin_lock(&ifa->lock);
6664 if (ifa->rt) {
6665 /* host routes only use builtin fib6_nh */
6666 struct fib6_nh *nh = ifa->rt->fib6_nh;
6667 int cpu;
6668
6669 rcu_read_lock();
6670 ifa->rt->dst_nopolicy = val ? true : false;
6671 if (nh->rt6i_pcpu) {
6672 for_each_possible_cpu(cpu) {
6673 struct rt6_info **rtp;
6674
6675 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6676 addrconf_set_nopolicy(*rtp, val);
6677 }
6678 }
6679 rcu_read_unlock();
6680 }
6681 spin_unlock(&ifa->lock);
6682 }
6683 read_unlock_bh(&idev->lock);
6684}
6685
6686static
6687int addrconf_disable_policy(const struct ctl_table *ctl, int *valp, int val)
6688{
6689 struct net *net = (struct net *)ctl->extra2;
6690 struct inet6_dev *idev;
6691
6692 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6693 WRITE_ONCE(*valp, val);
6694 return 0;
6695 }
6696
6697 if (!rtnl_trylock())
6698 return restart_syscall();
6699
6700 WRITE_ONCE(*valp, val);
6701
6702 if (valp == &net->ipv6.devconf_all->disable_policy) {
6703 struct net_device *dev;
6704
6705 for_each_netdev(net, dev) {
6706 idev = __in6_dev_get(dev);
6707 if (idev)
6708 addrconf_disable_policy_idev(idev, val);
6709 }
6710 } else {
6711 idev = (struct inet6_dev *)ctl->extra1;
6712 addrconf_disable_policy_idev(idev, val);
6713 }
6714
6715 rtnl_unlock();
6716 return 0;
6717}
6718
6719static int addrconf_sysctl_disable_policy(const struct ctl_table *ctl, int write,
6720 void *buffer, size_t *lenp, loff_t *ppos)
6721{
6722 int *valp = ctl->data;
6723 int val = *valp;
6724 loff_t pos = *ppos;
6725 struct ctl_table lctl;
6726 int ret;
6727
6728 lctl = *ctl;
6729 lctl.data = &val;
6730 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6731
6732 if (write && (*valp != val))
6733 ret = addrconf_disable_policy(ctl, valp, val);
6734
6735 if (ret)
6736 *ppos = pos;
6737
6738 return ret;
6739}
6740
6741static int minus_one = -1;
6742static const int two_five_five = 255;
6743static u32 ioam6_if_id_max = U16_MAX;
6744
6745static const struct ctl_table addrconf_sysctl[] = {
6746 {
6747 .procname = "forwarding",
6748 .data = &ipv6_devconf.forwarding,
6749 .maxlen = sizeof(int),
6750 .mode = 0644,
6751 .proc_handler = addrconf_sysctl_forward,
6752 },
6753 {
6754 .procname = "hop_limit",
6755 .data = &ipv6_devconf.hop_limit,
6756 .maxlen = sizeof(int),
6757 .mode = 0644,
6758 .proc_handler = proc_dointvec_minmax,
6759 .extra1 = (void *)SYSCTL_ONE,
6760 .extra2 = (void *)&two_five_five,
6761 },
6762 {
6763 .procname = "mtu",
6764 .data = &ipv6_devconf.mtu6,
6765 .maxlen = sizeof(int),
6766 .mode = 0644,
6767 .proc_handler = addrconf_sysctl_mtu,
6768 },
6769 {
6770 .procname = "accept_ra",
6771 .data = &ipv6_devconf.accept_ra,
6772 .maxlen = sizeof(int),
6773 .mode = 0644,
6774 .proc_handler = proc_dointvec,
6775 },
6776 {
6777 .procname = "accept_redirects",
6778 .data = &ipv6_devconf.accept_redirects,
6779 .maxlen = sizeof(int),
6780 .mode = 0644,
6781 .proc_handler = proc_dointvec,
6782 },
6783 {
6784 .procname = "autoconf",
6785 .data = &ipv6_devconf.autoconf,
6786 .maxlen = sizeof(int),
6787 .mode = 0644,
6788 .proc_handler = proc_dointvec,
6789 },
6790 {
6791 .procname = "dad_transmits",
6792 .data = &ipv6_devconf.dad_transmits,
6793 .maxlen = sizeof(int),
6794 .mode = 0644,
6795 .proc_handler = proc_dointvec,
6796 },
6797 {
6798 .procname = "router_solicitations",
6799 .data = &ipv6_devconf.rtr_solicits,
6800 .maxlen = sizeof(int),
6801 .mode = 0644,
6802 .proc_handler = proc_dointvec_minmax,
6803 .extra1 = &minus_one,
6804 },
6805 {
6806 .procname = "router_solicitation_interval",
6807 .data = &ipv6_devconf.rtr_solicit_interval,
6808 .maxlen = sizeof(int),
6809 .mode = 0644,
6810 .proc_handler = proc_dointvec_jiffies,
6811 },
6812 {
6813 .procname = "router_solicitation_max_interval",
6814 .data = &ipv6_devconf.rtr_solicit_max_interval,
6815 .maxlen = sizeof(int),
6816 .mode = 0644,
6817 .proc_handler = proc_dointvec_jiffies,
6818 },
6819 {
6820 .procname = "router_solicitation_delay",
6821 .data = &ipv6_devconf.rtr_solicit_delay,
6822 .maxlen = sizeof(int),
6823 .mode = 0644,
6824 .proc_handler = proc_dointvec_jiffies,
6825 },
6826 {
6827 .procname = "force_mld_version",
6828 .data = &ipv6_devconf.force_mld_version,
6829 .maxlen = sizeof(int),
6830 .mode = 0644,
6831 .proc_handler = proc_dointvec,
6832 },
6833 {
6834 .procname = "mldv1_unsolicited_report_interval",
6835 .data =
6836 &ipv6_devconf.mldv1_unsolicited_report_interval,
6837 .maxlen = sizeof(int),
6838 .mode = 0644,
6839 .proc_handler = proc_dointvec_ms_jiffies,
6840 },
6841 {
6842 .procname = "mldv2_unsolicited_report_interval",
6843 .data =
6844 &ipv6_devconf.mldv2_unsolicited_report_interval,
6845 .maxlen = sizeof(int),
6846 .mode = 0644,
6847 .proc_handler = proc_dointvec_ms_jiffies,
6848 },
6849 {
6850 .procname = "use_tempaddr",
6851 .data = &ipv6_devconf.use_tempaddr,
6852 .maxlen = sizeof(int),
6853 .mode = 0644,
6854 .proc_handler = proc_dointvec,
6855 },
6856 {
6857 .procname = "temp_valid_lft",
6858 .data = &ipv6_devconf.temp_valid_lft,
6859 .maxlen = sizeof(int),
6860 .mode = 0644,
6861 .proc_handler = proc_dointvec,
6862 },
6863 {
6864 .procname = "temp_prefered_lft",
6865 .data = &ipv6_devconf.temp_prefered_lft,
6866 .maxlen = sizeof(int),
6867 .mode = 0644,
6868 .proc_handler = proc_dointvec,
6869 },
6870 {
6871 .procname = "regen_min_advance",
6872 .data = &ipv6_devconf.regen_min_advance,
6873 .maxlen = sizeof(int),
6874 .mode = 0644,
6875 .proc_handler = proc_dointvec,
6876 },
6877 {
6878 .procname = "regen_max_retry",
6879 .data = &ipv6_devconf.regen_max_retry,
6880 .maxlen = sizeof(int),
6881 .mode = 0644,
6882 .proc_handler = proc_dointvec,
6883 },
6884 {
6885 .procname = "max_desync_factor",
6886 .data = &ipv6_devconf.max_desync_factor,
6887 .maxlen = sizeof(int),
6888 .mode = 0644,
6889 .proc_handler = proc_dointvec,
6890 },
6891 {
6892 .procname = "max_addresses",
6893 .data = &ipv6_devconf.max_addresses,
6894 .maxlen = sizeof(int),
6895 .mode = 0644,
6896 .proc_handler = proc_dointvec,
6897 },
6898 {
6899 .procname = "accept_ra_defrtr",
6900 .data = &ipv6_devconf.accept_ra_defrtr,
6901 .maxlen = sizeof(int),
6902 .mode = 0644,
6903 .proc_handler = proc_dointvec,
6904 },
6905 {
6906 .procname = "ra_defrtr_metric",
6907 .data = &ipv6_devconf.ra_defrtr_metric,
6908 .maxlen = sizeof(u32),
6909 .mode = 0644,
6910 .proc_handler = proc_douintvec_minmax,
6911 .extra1 = (void *)SYSCTL_ONE,
6912 },
6913 {
6914 .procname = "accept_ra_min_hop_limit",
6915 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6916 .maxlen = sizeof(int),
6917 .mode = 0644,
6918 .proc_handler = proc_dointvec,
6919 },
6920 {
6921 .procname = "accept_ra_min_lft",
6922 .data = &ipv6_devconf.accept_ra_min_lft,
6923 .maxlen = sizeof(int),
6924 .mode = 0644,
6925 .proc_handler = proc_dointvec,
6926 },
6927 {
6928 .procname = "accept_ra_pinfo",
6929 .data = &ipv6_devconf.accept_ra_pinfo,
6930 .maxlen = sizeof(int),
6931 .mode = 0644,
6932 .proc_handler = proc_dointvec,
6933 },
6934 {
6935 .procname = "ra_honor_pio_life",
6936 .data = &ipv6_devconf.ra_honor_pio_life,
6937 .maxlen = sizeof(u8),
6938 .mode = 0644,
6939 .proc_handler = proc_dou8vec_minmax,
6940 .extra1 = SYSCTL_ZERO,
6941 .extra2 = SYSCTL_ONE,
6942 },
6943 {
6944 .procname = "ra_honor_pio_pflag",
6945 .data = &ipv6_devconf.ra_honor_pio_pflag,
6946 .maxlen = sizeof(u8),
6947 .mode = 0644,
6948 .proc_handler = proc_dou8vec_minmax,
6949 .extra1 = SYSCTL_ZERO,
6950 .extra2 = SYSCTL_ONE,
6951 },
6952#ifdef CONFIG_IPV6_ROUTER_PREF
6953 {
6954 .procname = "accept_ra_rtr_pref",
6955 .data = &ipv6_devconf.accept_ra_rtr_pref,
6956 .maxlen = sizeof(int),
6957 .mode = 0644,
6958 .proc_handler = proc_dointvec,
6959 },
6960 {
6961 .procname = "router_probe_interval",
6962 .data = &ipv6_devconf.rtr_probe_interval,
6963 .maxlen = sizeof(int),
6964 .mode = 0644,
6965 .proc_handler = proc_dointvec_jiffies,
6966 },
6967#ifdef CONFIG_IPV6_ROUTE_INFO
6968 {
6969 .procname = "accept_ra_rt_info_min_plen",
6970 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6971 .maxlen = sizeof(int),
6972 .mode = 0644,
6973 .proc_handler = proc_dointvec,
6974 },
6975 {
6976 .procname = "accept_ra_rt_info_max_plen",
6977 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6978 .maxlen = sizeof(int),
6979 .mode = 0644,
6980 .proc_handler = proc_dointvec,
6981 },
6982#endif
6983#endif
6984 {
6985 .procname = "proxy_ndp",
6986 .data = &ipv6_devconf.proxy_ndp,
6987 .maxlen = sizeof(int),
6988 .mode = 0644,
6989 .proc_handler = addrconf_sysctl_proxy_ndp,
6990 },
6991 {
6992 .procname = "accept_source_route",
6993 .data = &ipv6_devconf.accept_source_route,
6994 .maxlen = sizeof(int),
6995 .mode = 0644,
6996 .proc_handler = proc_dointvec,
6997 },
6998#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6999 {
7000 .procname = "optimistic_dad",
7001 .data = &ipv6_devconf.optimistic_dad,
7002 .maxlen = sizeof(int),
7003 .mode = 0644,
7004 .proc_handler = proc_dointvec,
7005 },
7006 {
7007 .procname = "use_optimistic",
7008 .data = &ipv6_devconf.use_optimistic,
7009 .maxlen = sizeof(int),
7010 .mode = 0644,
7011 .proc_handler = proc_dointvec,
7012 },
7013#endif
7014#ifdef CONFIG_IPV6_MROUTE
7015 {
7016 .procname = "mc_forwarding",
7017 .data = &ipv6_devconf.mc_forwarding,
7018 .maxlen = sizeof(int),
7019 .mode = 0444,
7020 .proc_handler = proc_dointvec,
7021 },
7022#endif
7023 {
7024 .procname = "disable_ipv6",
7025 .data = &ipv6_devconf.disable_ipv6,
7026 .maxlen = sizeof(int),
7027 .mode = 0644,
7028 .proc_handler = addrconf_sysctl_disable,
7029 },
7030 {
7031 .procname = "accept_dad",
7032 .data = &ipv6_devconf.accept_dad,
7033 .maxlen = sizeof(int),
7034 .mode = 0644,
7035 .proc_handler = proc_dointvec,
7036 },
7037 {
7038 .procname = "force_tllao",
7039 .data = &ipv6_devconf.force_tllao,
7040 .maxlen = sizeof(int),
7041 .mode = 0644,
7042 .proc_handler = proc_dointvec
7043 },
7044 {
7045 .procname = "ndisc_notify",
7046 .data = &ipv6_devconf.ndisc_notify,
7047 .maxlen = sizeof(int),
7048 .mode = 0644,
7049 .proc_handler = proc_dointvec
7050 },
7051 {
7052 .procname = "suppress_frag_ndisc",
7053 .data = &ipv6_devconf.suppress_frag_ndisc,
7054 .maxlen = sizeof(int),
7055 .mode = 0644,
7056 .proc_handler = proc_dointvec
7057 },
7058 {
7059 .procname = "accept_ra_from_local",
7060 .data = &ipv6_devconf.accept_ra_from_local,
7061 .maxlen = sizeof(int),
7062 .mode = 0644,
7063 .proc_handler = proc_dointvec,
7064 },
7065 {
7066 .procname = "accept_ra_mtu",
7067 .data = &ipv6_devconf.accept_ra_mtu,
7068 .maxlen = sizeof(int),
7069 .mode = 0644,
7070 .proc_handler = proc_dointvec,
7071 },
7072 {
7073 .procname = "stable_secret",
7074 .data = &ipv6_devconf.stable_secret,
7075 .maxlen = IPV6_MAX_STRLEN,
7076 .mode = 0600,
7077 .proc_handler = addrconf_sysctl_stable_secret,
7078 },
7079 {
7080 .procname = "use_oif_addrs_only",
7081 .data = &ipv6_devconf.use_oif_addrs_only,
7082 .maxlen = sizeof(int),
7083 .mode = 0644,
7084 .proc_handler = proc_dointvec,
7085 },
7086 {
7087 .procname = "ignore_routes_with_linkdown",
7088 .data = &ipv6_devconf.ignore_routes_with_linkdown,
7089 .maxlen = sizeof(int),
7090 .mode = 0644,
7091 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
7092 },
7093 {
7094 .procname = "drop_unicast_in_l2_multicast",
7095 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
7096 .maxlen = sizeof(int),
7097 .mode = 0644,
7098 .proc_handler = proc_dointvec,
7099 },
7100 {
7101 .procname = "drop_unsolicited_na",
7102 .data = &ipv6_devconf.drop_unsolicited_na,
7103 .maxlen = sizeof(int),
7104 .mode = 0644,
7105 .proc_handler = proc_dointvec,
7106 },
7107 {
7108 .procname = "keep_addr_on_down",
7109 .data = &ipv6_devconf.keep_addr_on_down,
7110 .maxlen = sizeof(int),
7111 .mode = 0644,
7112 .proc_handler = proc_dointvec,
7113
7114 },
7115 {
7116 .procname = "seg6_enabled",
7117 .data = &ipv6_devconf.seg6_enabled,
7118 .maxlen = sizeof(int),
7119 .mode = 0644,
7120 .proc_handler = proc_dointvec,
7121 },
7122#ifdef CONFIG_IPV6_SEG6_HMAC
7123 {
7124 .procname = "seg6_require_hmac",
7125 .data = &ipv6_devconf.seg6_require_hmac,
7126 .maxlen = sizeof(int),
7127 .mode = 0644,
7128 .proc_handler = proc_dointvec,
7129 },
7130#endif
7131 {
7132 .procname = "enhanced_dad",
7133 .data = &ipv6_devconf.enhanced_dad,
7134 .maxlen = sizeof(int),
7135 .mode = 0644,
7136 .proc_handler = proc_dointvec,
7137 },
7138 {
7139 .procname = "addr_gen_mode",
7140 .data = &ipv6_devconf.addr_gen_mode,
7141 .maxlen = sizeof(int),
7142 .mode = 0644,
7143 .proc_handler = addrconf_sysctl_addr_gen_mode,
7144 },
7145 {
7146 .procname = "disable_policy",
7147 .data = &ipv6_devconf.disable_policy,
7148 .maxlen = sizeof(int),
7149 .mode = 0644,
7150 .proc_handler = addrconf_sysctl_disable_policy,
7151 },
7152 {
7153 .procname = "ndisc_tclass",
7154 .data = &ipv6_devconf.ndisc_tclass,
7155 .maxlen = sizeof(int),
7156 .mode = 0644,
7157 .proc_handler = proc_dointvec_minmax,
7158 .extra1 = (void *)SYSCTL_ZERO,
7159 .extra2 = (void *)&two_five_five,
7160 },
7161 {
7162 .procname = "rpl_seg_enabled",
7163 .data = &ipv6_devconf.rpl_seg_enabled,
7164 .maxlen = sizeof(int),
7165 .mode = 0644,
7166 .proc_handler = proc_dointvec,
7167 },
7168 {
7169 .procname = "ioam6_enabled",
7170 .data = &ipv6_devconf.ioam6_enabled,
7171 .maxlen = sizeof(u8),
7172 .mode = 0644,
7173 .proc_handler = proc_dou8vec_minmax,
7174 .extra1 = (void *)SYSCTL_ZERO,
7175 .extra2 = (void *)SYSCTL_ONE,
7176 },
7177 {
7178 .procname = "ioam6_id",
7179 .data = &ipv6_devconf.ioam6_id,
7180 .maxlen = sizeof(u32),
7181 .mode = 0644,
7182 .proc_handler = proc_douintvec_minmax,
7183 .extra1 = (void *)SYSCTL_ZERO,
7184 .extra2 = (void *)&ioam6_if_id_max,
7185 },
7186 {
7187 .procname = "ioam6_id_wide",
7188 .data = &ipv6_devconf.ioam6_id_wide,
7189 .maxlen = sizeof(u32),
7190 .mode = 0644,
7191 .proc_handler = proc_douintvec,
7192 },
7193 {
7194 .procname = "ndisc_evict_nocarrier",
7195 .data = &ipv6_devconf.ndisc_evict_nocarrier,
7196 .maxlen = sizeof(u8),
7197 .mode = 0644,
7198 .proc_handler = proc_dou8vec_minmax,
7199 .extra1 = (void *)SYSCTL_ZERO,
7200 .extra2 = (void *)SYSCTL_ONE,
7201 },
7202 {
7203 .procname = "accept_untracked_na",
7204 .data = &ipv6_devconf.accept_untracked_na,
7205 .maxlen = sizeof(int),
7206 .mode = 0644,
7207 .proc_handler = proc_dointvec_minmax,
7208 .extra1 = SYSCTL_ZERO,
7209 .extra2 = SYSCTL_TWO,
7210 },
7211};
7212
7213static int __addrconf_sysctl_register(struct net *net, char *dev_name,
7214 struct inet6_dev *idev, struct ipv6_devconf *p)
7215{
7216 size_t table_size = ARRAY_SIZE(addrconf_sysctl);
7217 int i, ifindex;
7218 struct ctl_table *table;
7219 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
7220
7221 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT);
7222 if (!table)
7223 goto out;
7224
7225 for (i = 0; i < table_size; i++) {
7226 table[i].data += (char *)p - (char *)&ipv6_devconf;
7227 /* If one of these is already set, then it is not safe to
7228 * overwrite either of them: this makes proc_dointvec_minmax
7229 * usable.
7230 */
7231 if (!table[i].extra1 && !table[i].extra2) {
7232 table[i].extra1 = idev; /* embedded; no ref */
7233 table[i].extra2 = net;
7234 }
7235 }
7236
7237 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
7238
7239 p->sysctl_header = register_net_sysctl_sz(net, path, table,
7240 table_size);
7241 if (!p->sysctl_header)
7242 goto free;
7243
7244 if (!strcmp(dev_name, "all"))
7245 ifindex = NETCONFA_IFINDEX_ALL;
7246 else if (!strcmp(dev_name, "default"))
7247 ifindex = NETCONFA_IFINDEX_DEFAULT;
7248 else
7249 ifindex = idev->dev->ifindex;
7250 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7251 ifindex, p);
7252 return 0;
7253
7254free:
7255 kfree(table);
7256out:
7257 return -ENOBUFS;
7258}
7259
7260static void __addrconf_sysctl_unregister(struct net *net,
7261 struct ipv6_devconf *p, int ifindex)
7262{
7263 const struct ctl_table *table;
7264
7265 if (!p->sysctl_header)
7266 return;
7267
7268 table = p->sysctl_header->ctl_table_arg;
7269 unregister_net_sysctl_table(p->sysctl_header);
7270 p->sysctl_header = NULL;
7271 kfree(table);
7272
7273 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
7274}
7275
7276static int addrconf_sysctl_register(struct inet6_dev *idev)
7277{
7278 int err;
7279
7280 if (!sysctl_dev_name_is_allowed(idev->dev->name))
7281 return -EINVAL;
7282
7283 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7284 &ndisc_ifinfo_sysctl_change);
7285 if (err)
7286 return err;
7287 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7288 idev, &idev->cnf);
7289 if (err)
7290 neigh_sysctl_unregister(idev->nd_parms);
7291
7292 return err;
7293}
7294
7295static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7296{
7297 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7298 idev->dev->ifindex);
7299 neigh_sysctl_unregister(idev->nd_parms);
7300}
7301
7302
7303#endif
7304
7305static int __net_init addrconf_init_net(struct net *net)
7306{
7307 int err = -ENOMEM;
7308 struct ipv6_devconf *all, *dflt;
7309
7310 spin_lock_init(&net->ipv6.addrconf_hash_lock);
7311 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work);
7312 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE,
7313 sizeof(struct hlist_head),
7314 GFP_KERNEL);
7315 if (!net->ipv6.inet6_addr_lst)
7316 goto err_alloc_addr;
7317
7318 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7319 if (!all)
7320 goto err_alloc_all;
7321
7322 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7323 if (!dflt)
7324 goto err_alloc_dflt;
7325
7326 if (!net_eq(net, &init_net)) {
7327 switch (net_inherit_devconf()) {
7328 case 1: /* copy from init_net */
7329 memcpy(all, init_net.ipv6.devconf_all,
7330 sizeof(ipv6_devconf));
7331 memcpy(dflt, init_net.ipv6.devconf_dflt,
7332 sizeof(ipv6_devconf_dflt));
7333 break;
7334 case 3: /* copy from the current netns */
7335 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7336 sizeof(ipv6_devconf));
7337 memcpy(dflt,
7338 current->nsproxy->net_ns->ipv6.devconf_dflt,
7339 sizeof(ipv6_devconf_dflt));
7340 break;
7341 case 0:
7342 case 2:
7343 /* use compiled values */
7344 break;
7345 }
7346 }
7347
7348 /* these will be inherited by all namespaces */
7349 dflt->autoconf = ipv6_defaults.autoconf;
7350 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7351
7352 dflt->stable_secret.initialized = false;
7353 all->stable_secret.initialized = false;
7354
7355 net->ipv6.devconf_all = all;
7356 net->ipv6.devconf_dflt = dflt;
7357
7358#ifdef CONFIG_SYSCTL
7359 err = __addrconf_sysctl_register(net, "all", NULL, all);
7360 if (err < 0)
7361 goto err_reg_all;
7362
7363 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7364 if (err < 0)
7365 goto err_reg_dflt;
7366#endif
7367 return 0;
7368
7369#ifdef CONFIG_SYSCTL
7370err_reg_dflt:
7371 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7372err_reg_all:
7373 kfree(dflt);
7374 net->ipv6.devconf_dflt = NULL;
7375#endif
7376err_alloc_dflt:
7377 kfree(all);
7378 net->ipv6.devconf_all = NULL;
7379err_alloc_all:
7380 kfree(net->ipv6.inet6_addr_lst);
7381err_alloc_addr:
7382 return err;
7383}
7384
7385static void __net_exit addrconf_exit_net(struct net *net)
7386{
7387 int i;
7388
7389#ifdef CONFIG_SYSCTL
7390 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7391 NETCONFA_IFINDEX_DEFAULT);
7392 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7393 NETCONFA_IFINDEX_ALL);
7394#endif
7395 kfree(net->ipv6.devconf_dflt);
7396 net->ipv6.devconf_dflt = NULL;
7397 kfree(net->ipv6.devconf_all);
7398 net->ipv6.devconf_all = NULL;
7399
7400 cancel_delayed_work_sync(&net->ipv6.addr_chk_work);
7401 /*
7402 * Check hash table, then free it.
7403 */
7404 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7405 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i]));
7406
7407 kfree(net->ipv6.inet6_addr_lst);
7408 net->ipv6.inet6_addr_lst = NULL;
7409}
7410
7411static struct pernet_operations addrconf_ops = {
7412 .init = addrconf_init_net,
7413 .exit = addrconf_exit_net,
7414};
7415
7416static struct rtnl_af_ops inet6_ops __read_mostly = {
7417 .family = AF_INET6,
7418 .fill_link_af = inet6_fill_link_af,
7419 .get_link_af_size = inet6_get_link_af_size,
7420 .validate_link_af = inet6_validate_link_af,
7421 .set_link_af = inet6_set_link_af,
7422};
7423
7424static const struct rtnl_msg_handler addrconf_rtnl_msg_handlers[] __initconst_or_module = {
7425 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETLINK,
7426 .dumpit = inet6_dump_ifinfo, .flags = RTNL_FLAG_DUMP_UNLOCKED},
7427 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_NEWADDR,
7428 .doit = inet6_rtm_newaddr},
7429 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_DELADDR,
7430 .doit = inet6_rtm_deladdr},
7431 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETADDR,
7432 .doit = inet6_rtm_getaddr, .dumpit = inet6_dump_ifaddr,
7433 .flags = RTNL_FLAG_DOIT_UNLOCKED | RTNL_FLAG_DUMP_UNLOCKED},
7434 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETMULTICAST,
7435 .dumpit = inet6_dump_ifmcaddr,
7436 .flags = RTNL_FLAG_DUMP_UNLOCKED},
7437 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETANYCAST,
7438 .dumpit = inet6_dump_ifacaddr,
7439 .flags = RTNL_FLAG_DUMP_UNLOCKED},
7440 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETNETCONF,
7441 .doit = inet6_netconf_get_devconf, .dumpit = inet6_netconf_dump_devconf,
7442 .flags = RTNL_FLAG_DOIT_UNLOCKED | RTNL_FLAG_DUMP_UNLOCKED},
7443};
7444
7445/*
7446 * Init / cleanup code
7447 */
7448
7449int __init addrconf_init(void)
7450{
7451 struct inet6_dev *idev;
7452 int err;
7453
7454 err = ipv6_addr_label_init();
7455 if (err < 0) {
7456 pr_crit("%s: cannot initialize default policy table: %d\n",
7457 __func__, err);
7458 goto out;
7459 }
7460
7461 err = register_pernet_subsys(&addrconf_ops);
7462 if (err < 0)
7463 goto out_addrlabel;
7464
7465 /* All works using addrconf_wq need to lock rtnl. */
7466 addrconf_wq = create_singlethread_workqueue("ipv6_addrconf");
7467 if (!addrconf_wq) {
7468 err = -ENOMEM;
7469 goto out_nowq;
7470 }
7471
7472 rtnl_lock();
7473 idev = ipv6_add_dev(blackhole_netdev);
7474 rtnl_unlock();
7475 if (IS_ERR(idev)) {
7476 err = PTR_ERR(idev);
7477 goto errlo;
7478 }
7479
7480 ip6_route_init_special_entries();
7481
7482 register_netdevice_notifier(&ipv6_dev_notf);
7483
7484 addrconf_verify(&init_net);
7485
7486 err = rtnl_af_register(&inet6_ops);
7487 if (err)
7488 goto erraf;
7489
7490 err = rtnl_register_many(addrconf_rtnl_msg_handlers);
7491 if (err)
7492 goto errout;
7493
7494 err = ipv6_addr_label_rtnl_register();
7495 if (err < 0)
7496 goto errout;
7497
7498 return 0;
7499errout:
7500 rtnl_unregister_all(PF_INET6);
7501 rtnl_af_unregister(&inet6_ops);
7502erraf:
7503 unregister_netdevice_notifier(&ipv6_dev_notf);
7504errlo:
7505 destroy_workqueue(addrconf_wq);
7506out_nowq:
7507 unregister_pernet_subsys(&addrconf_ops);
7508out_addrlabel:
7509 ipv6_addr_label_cleanup();
7510out:
7511 return err;
7512}
7513
7514void addrconf_cleanup(void)
7515{
7516 struct net_device *dev;
7517
7518 unregister_netdevice_notifier(&ipv6_dev_notf);
7519 unregister_pernet_subsys(&addrconf_ops);
7520 ipv6_addr_label_cleanup();
7521
7522 rtnl_af_unregister(&inet6_ops);
7523
7524 rtnl_lock();
7525
7526 /* clean dev list */
7527 for_each_netdev(&init_net, dev) {
7528 if (__in6_dev_get(dev) == NULL)
7529 continue;
7530 addrconf_ifdown(dev, true);
7531 }
7532 addrconf_ifdown(init_net.loopback_dev, true);
7533
7534 rtnl_unlock();
7535
7536 destroy_workqueue(addrconf_wq);
7537}