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Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
[deliverable/linux.git] / net / ipv6 / addrconf.c
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/in6.h>
50 #include <linux/netdevice.h>
51 #include <linux/if_addr.h>
52 #include <linux/if_arp.h>
53 #include <linux/if_arcnet.h>
54 #include <linux/if_infiniband.h>
55 #include <linux/route.h>
56 #include <linux/inetdevice.h>
57 #include <linux/init.h>
58 #include <linux/slab.h>
59 #ifdef CONFIG_SYSCTL
60 #include <linux/sysctl.h>
61 #endif
62 #include <linux/capability.h>
63 #include <linux/delay.h>
64 #include <linux/notifier.h>
65 #include <linux/string.h>
66 #include <linux/hash.h>
67
68 #include <net/net_namespace.h>
69 #include <net/sock.h>
70 #include <net/snmp.h>
71
72 #include <net/af_ieee802154.h>
73 #include <net/firewire.h>
74 #include <net/ipv6.h>
75 #include <net/protocol.h>
76 #include <net/ndisc.h>
77 #include <net/ip6_route.h>
78 #include <net/addrconf.h>
79 #include <net/tcp.h>
80 #include <net/ip.h>
81 #include <net/netlink.h>
82 #include <net/pkt_sched.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 <asm/unaligned.h>
89
90 #include <linux/proc_fs.h>
91 #include <linux/seq_file.h>
92 #include <linux/export.h>
93
94 /* Set to 3 to get tracing... */
95 #define ACONF_DEBUG 2
96
97 #if ACONF_DEBUG >= 3
98 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
99 #else
100 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
101 #endif
102
103 #define INFINITY_LIFE_TIME 0xFFFFFFFF
104
105 static inline u32 cstamp_delta(unsigned long cstamp)
106 {
107 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
108 }
109
110 #ifdef CONFIG_SYSCTL
111 static void addrconf_sysctl_register(struct inet6_dev *idev);
112 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
113 #else
114 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
115 {
116 }
117
118 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
119 {
120 }
121 #endif
122
123 static void __ipv6_regen_rndid(struct inet6_dev *idev);
124 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
125 static void ipv6_regen_rndid(unsigned long data);
126
127 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
128 static int ipv6_count_addresses(struct inet6_dev *idev);
129
130 /*
131 * Configured unicast address hash table
132 */
133 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
134 static DEFINE_SPINLOCK(addrconf_hash_lock);
135
136 static void addrconf_verify(unsigned long);
137
138 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
139 static DEFINE_SPINLOCK(addrconf_verify_lock);
140
141 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
142 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
143
144 static void addrconf_type_change(struct net_device *dev,
145 unsigned long event);
146 static int addrconf_ifdown(struct net_device *dev, int how);
147
148 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
149 int plen,
150 const struct net_device *dev,
151 u32 flags, u32 noflags);
152
153 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
154 static void addrconf_dad_timer(unsigned long data);
155 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
156 static void addrconf_dad_run(struct inet6_dev *idev);
157 static void addrconf_rs_timer(unsigned long data);
158 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
159 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
160
161 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
162 struct prefix_info *pinfo);
163 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
164 struct net_device *dev);
165
166 static struct ipv6_devconf ipv6_devconf __read_mostly = {
167 .forwarding = 0,
168 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
169 .mtu6 = IPV6_MIN_MTU,
170 .accept_ra = 1,
171 .accept_redirects = 1,
172 .autoconf = 1,
173 .force_mld_version = 0,
174 .mldv1_unsolicited_report_interval = 10 * HZ,
175 .mldv2_unsolicited_report_interval = HZ,
176 .dad_transmits = 1,
177 .rtr_solicits = MAX_RTR_SOLICITATIONS,
178 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
179 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
180 .use_tempaddr = 0,
181 .temp_valid_lft = TEMP_VALID_LIFETIME,
182 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
183 .regen_max_retry = REGEN_MAX_RETRY,
184 .max_desync_factor = MAX_DESYNC_FACTOR,
185 .max_addresses = IPV6_MAX_ADDRESSES,
186 .accept_ra_defrtr = 1,
187 .accept_ra_pinfo = 1,
188 #ifdef CONFIG_IPV6_ROUTER_PREF
189 .accept_ra_rtr_pref = 1,
190 .rtr_probe_interval = 60 * HZ,
191 #ifdef CONFIG_IPV6_ROUTE_INFO
192 .accept_ra_rt_info_max_plen = 0,
193 #endif
194 #endif
195 .proxy_ndp = 0,
196 .accept_source_route = 0, /* we do not accept RH0 by default. */
197 .disable_ipv6 = 0,
198 .accept_dad = 1,
199 .suppress_frag_ndisc = 1,
200 };
201
202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
203 .forwarding = 0,
204 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
205 .mtu6 = IPV6_MIN_MTU,
206 .accept_ra = 1,
207 .accept_redirects = 1,
208 .autoconf = 1,
209 .force_mld_version = 0,
210 .mldv1_unsolicited_report_interval = 10 * HZ,
211 .mldv2_unsolicited_report_interval = HZ,
212 .dad_transmits = 1,
213 .rtr_solicits = MAX_RTR_SOLICITATIONS,
214 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
215 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
216 .use_tempaddr = 0,
217 .temp_valid_lft = TEMP_VALID_LIFETIME,
218 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
219 .regen_max_retry = REGEN_MAX_RETRY,
220 .max_desync_factor = MAX_DESYNC_FACTOR,
221 .max_addresses = IPV6_MAX_ADDRESSES,
222 .accept_ra_defrtr = 1,
223 .accept_ra_pinfo = 1,
224 #ifdef CONFIG_IPV6_ROUTER_PREF
225 .accept_ra_rtr_pref = 1,
226 .rtr_probe_interval = 60 * HZ,
227 #ifdef CONFIG_IPV6_ROUTE_INFO
228 .accept_ra_rt_info_max_plen = 0,
229 #endif
230 #endif
231 .proxy_ndp = 0,
232 .accept_source_route = 0, /* we do not accept RH0 by default. */
233 .disable_ipv6 = 0,
234 .accept_dad = 1,
235 .suppress_frag_ndisc = 1,
236 };
237
238 /* Check if a valid qdisc is available */
239 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
240 {
241 return !qdisc_tx_is_noop(dev);
242 }
243
244 static void addrconf_del_rs_timer(struct inet6_dev *idev)
245 {
246 if (del_timer(&idev->rs_timer))
247 __in6_dev_put(idev);
248 }
249
250 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
251 {
252 if (del_timer(&ifp->dad_timer))
253 __in6_ifa_put(ifp);
254 }
255
256 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
257 unsigned long when)
258 {
259 if (!timer_pending(&idev->rs_timer))
260 in6_dev_hold(idev);
261 mod_timer(&idev->rs_timer, jiffies + when);
262 }
263
264 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
265 unsigned long when)
266 {
267 if (!timer_pending(&ifp->dad_timer))
268 in6_ifa_hold(ifp);
269 mod_timer(&ifp->dad_timer, jiffies + when);
270 }
271
272 static int snmp6_alloc_dev(struct inet6_dev *idev)
273 {
274 int i;
275
276 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
277 sizeof(struct ipstats_mib),
278 __alignof__(struct ipstats_mib)) < 0)
279 goto err_ip;
280
281 for_each_possible_cpu(i) {
282 struct ipstats_mib *addrconf_stats;
283 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[0], i);
284 u64_stats_init(&addrconf_stats->syncp);
285 #if SNMP_ARRAY_SZ == 2
286 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[1], i);
287 u64_stats_init(&addrconf_stats->syncp);
288 #endif
289 }
290
291
292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
293 GFP_KERNEL);
294 if (!idev->stats.icmpv6dev)
295 goto err_icmp;
296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
297 GFP_KERNEL);
298 if (!idev->stats.icmpv6msgdev)
299 goto err_icmpmsg;
300
301 return 0;
302
303 err_icmpmsg:
304 kfree(idev->stats.icmpv6dev);
305 err_icmp:
306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
307 err_ip:
308 return -ENOMEM;
309 }
310
311 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
312 {
313 struct inet6_dev *ndev;
314
315 ASSERT_RTNL();
316
317 if (dev->mtu < IPV6_MIN_MTU)
318 return NULL;
319
320 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
321
322 if (ndev == NULL)
323 return NULL;
324
325 rwlock_init(&ndev->lock);
326 ndev->dev = dev;
327 INIT_LIST_HEAD(&ndev->addr_list);
328 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
329 (unsigned long)ndev);
330 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
331 ndev->cnf.mtu6 = dev->mtu;
332 ndev->cnf.sysctl = NULL;
333 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
334 if (ndev->nd_parms == NULL) {
335 kfree(ndev);
336 return NULL;
337 }
338 if (ndev->cnf.forwarding)
339 dev_disable_lro(dev);
340 /* We refer to the device */
341 dev_hold(dev);
342
343 if (snmp6_alloc_dev(ndev) < 0) {
344 ADBG(KERN_WARNING
345 "%s: cannot allocate memory for statistics; dev=%s.\n",
346 __func__, dev->name);
347 neigh_parms_release(&nd_tbl, ndev->nd_parms);
348 dev_put(dev);
349 kfree(ndev);
350 return NULL;
351 }
352
353 if (snmp6_register_dev(ndev) < 0) {
354 ADBG(KERN_WARNING
355 "%s: cannot create /proc/net/dev_snmp6/%s\n",
356 __func__, dev->name);
357 neigh_parms_release(&nd_tbl, ndev->nd_parms);
358 ndev->dead = 1;
359 in6_dev_finish_destroy(ndev);
360 return NULL;
361 }
362
363 /* One reference from device. We must do this before
364 * we invoke __ipv6_regen_rndid().
365 */
366 in6_dev_hold(ndev);
367
368 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
369 ndev->cnf.accept_dad = -1;
370
371 #if IS_ENABLED(CONFIG_IPV6_SIT)
372 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
373 pr_info("%s: Disabled Multicast RS\n", dev->name);
374 ndev->cnf.rtr_solicits = 0;
375 }
376 #endif
377
378 INIT_LIST_HEAD(&ndev->tempaddr_list);
379 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
380 if ((dev->flags&IFF_LOOPBACK) ||
381 dev->type == ARPHRD_TUNNEL ||
382 dev->type == ARPHRD_TUNNEL6 ||
383 dev->type == ARPHRD_SIT ||
384 dev->type == ARPHRD_NONE) {
385 ndev->cnf.use_tempaddr = -1;
386 } else {
387 in6_dev_hold(ndev);
388 ipv6_regen_rndid((unsigned long) ndev);
389 }
390
391 ndev->token = in6addr_any;
392
393 if (netif_running(dev) && addrconf_qdisc_ok(dev))
394 ndev->if_flags |= IF_READY;
395
396 ipv6_mc_init_dev(ndev);
397 ndev->tstamp = jiffies;
398 addrconf_sysctl_register(ndev);
399 /* protected by rtnl_lock */
400 rcu_assign_pointer(dev->ip6_ptr, ndev);
401
402 /* Join interface-local all-node multicast group */
403 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
404
405 /* Join all-node multicast group */
406 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
407
408 /* Join all-router multicast group if forwarding is set */
409 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
410 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
411
412 return ndev;
413 }
414
415 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
416 {
417 struct inet6_dev *idev;
418
419 ASSERT_RTNL();
420
421 idev = __in6_dev_get(dev);
422 if (!idev) {
423 idev = ipv6_add_dev(dev);
424 if (!idev)
425 return NULL;
426 }
427
428 if (dev->flags&IFF_UP)
429 ipv6_mc_up(idev);
430 return idev;
431 }
432
433 static int inet6_netconf_msgsize_devconf(int type)
434 {
435 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
436 + nla_total_size(4); /* NETCONFA_IFINDEX */
437
438 /* type -1 is used for ALL */
439 if (type == -1 || type == NETCONFA_FORWARDING)
440 size += nla_total_size(4);
441 #ifdef CONFIG_IPV6_MROUTE
442 if (type == -1 || type == NETCONFA_MC_FORWARDING)
443 size += nla_total_size(4);
444 #endif
445
446 return size;
447 }
448
449 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
450 struct ipv6_devconf *devconf, u32 portid,
451 u32 seq, int event, unsigned int flags,
452 int type)
453 {
454 struct nlmsghdr *nlh;
455 struct netconfmsg *ncm;
456
457 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
458 flags);
459 if (nlh == NULL)
460 return -EMSGSIZE;
461
462 ncm = nlmsg_data(nlh);
463 ncm->ncm_family = AF_INET6;
464
465 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
466 goto nla_put_failure;
467
468 /* type -1 is used for ALL */
469 if ((type == -1 || type == NETCONFA_FORWARDING) &&
470 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
471 goto nla_put_failure;
472 #ifdef CONFIG_IPV6_MROUTE
473 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
474 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
475 devconf->mc_forwarding) < 0)
476 goto nla_put_failure;
477 #endif
478 return nlmsg_end(skb, nlh);
479
480 nla_put_failure:
481 nlmsg_cancel(skb, nlh);
482 return -EMSGSIZE;
483 }
484
485 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
486 struct ipv6_devconf *devconf)
487 {
488 struct sk_buff *skb;
489 int err = -ENOBUFS;
490
491 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
492 if (skb == NULL)
493 goto errout;
494
495 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
496 RTM_NEWNETCONF, 0, type);
497 if (err < 0) {
498 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
499 WARN_ON(err == -EMSGSIZE);
500 kfree_skb(skb);
501 goto errout;
502 }
503 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
504 return;
505 errout:
506 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
507 }
508
509 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
510 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
511 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
512 };
513
514 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
515 struct nlmsghdr *nlh)
516 {
517 struct net *net = sock_net(in_skb->sk);
518 struct nlattr *tb[NETCONFA_MAX+1];
519 struct netconfmsg *ncm;
520 struct sk_buff *skb;
521 struct ipv6_devconf *devconf;
522 struct inet6_dev *in6_dev;
523 struct net_device *dev;
524 int ifindex;
525 int err;
526
527 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
528 devconf_ipv6_policy);
529 if (err < 0)
530 goto errout;
531
532 err = EINVAL;
533 if (!tb[NETCONFA_IFINDEX])
534 goto errout;
535
536 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
537 switch (ifindex) {
538 case NETCONFA_IFINDEX_ALL:
539 devconf = net->ipv6.devconf_all;
540 break;
541 case NETCONFA_IFINDEX_DEFAULT:
542 devconf = net->ipv6.devconf_dflt;
543 break;
544 default:
545 dev = __dev_get_by_index(net, ifindex);
546 if (dev == NULL)
547 goto errout;
548 in6_dev = __in6_dev_get(dev);
549 if (in6_dev == NULL)
550 goto errout;
551 devconf = &in6_dev->cnf;
552 break;
553 }
554
555 err = -ENOBUFS;
556 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
557 if (skb == NULL)
558 goto errout;
559
560 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
561 NETLINK_CB(in_skb).portid,
562 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
563 -1);
564 if (err < 0) {
565 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
566 WARN_ON(err == -EMSGSIZE);
567 kfree_skb(skb);
568 goto errout;
569 }
570 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
571 errout:
572 return err;
573 }
574
575 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
576 struct netlink_callback *cb)
577 {
578 struct net *net = sock_net(skb->sk);
579 int h, s_h;
580 int idx, s_idx;
581 struct net_device *dev;
582 struct inet6_dev *idev;
583 struct hlist_head *head;
584
585 s_h = cb->args[0];
586 s_idx = idx = cb->args[1];
587
588 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
589 idx = 0;
590 head = &net->dev_index_head[h];
591 rcu_read_lock();
592 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
593 net->dev_base_seq;
594 hlist_for_each_entry_rcu(dev, head, index_hlist) {
595 if (idx < s_idx)
596 goto cont;
597 idev = __in6_dev_get(dev);
598 if (!idev)
599 goto cont;
600
601 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
602 &idev->cnf,
603 NETLINK_CB(cb->skb).portid,
604 cb->nlh->nlmsg_seq,
605 RTM_NEWNETCONF,
606 NLM_F_MULTI,
607 -1) <= 0) {
608 rcu_read_unlock();
609 goto done;
610 }
611 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
612 cont:
613 idx++;
614 }
615 rcu_read_unlock();
616 }
617 if (h == NETDEV_HASHENTRIES) {
618 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
619 net->ipv6.devconf_all,
620 NETLINK_CB(cb->skb).portid,
621 cb->nlh->nlmsg_seq,
622 RTM_NEWNETCONF, NLM_F_MULTI,
623 -1) <= 0)
624 goto done;
625 else
626 h++;
627 }
628 if (h == NETDEV_HASHENTRIES + 1) {
629 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
630 net->ipv6.devconf_dflt,
631 NETLINK_CB(cb->skb).portid,
632 cb->nlh->nlmsg_seq,
633 RTM_NEWNETCONF, NLM_F_MULTI,
634 -1) <= 0)
635 goto done;
636 else
637 h++;
638 }
639 done:
640 cb->args[0] = h;
641 cb->args[1] = idx;
642
643 return skb->len;
644 }
645
646 #ifdef CONFIG_SYSCTL
647 static void dev_forward_change(struct inet6_dev *idev)
648 {
649 struct net_device *dev;
650 struct inet6_ifaddr *ifa;
651
652 if (!idev)
653 return;
654 dev = idev->dev;
655 if (idev->cnf.forwarding)
656 dev_disable_lro(dev);
657 if (dev->flags & IFF_MULTICAST) {
658 if (idev->cnf.forwarding) {
659 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
660 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
661 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
662 } else {
663 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
664 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
665 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
666 }
667 }
668
669 list_for_each_entry(ifa, &idev->addr_list, if_list) {
670 if (ifa->flags&IFA_F_TENTATIVE)
671 continue;
672 if (idev->cnf.forwarding)
673 addrconf_join_anycast(ifa);
674 else
675 addrconf_leave_anycast(ifa);
676 }
677 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
678 dev->ifindex, &idev->cnf);
679 }
680
681
682 static void addrconf_forward_change(struct net *net, __s32 newf)
683 {
684 struct net_device *dev;
685 struct inet6_dev *idev;
686
687 for_each_netdev(net, dev) {
688 idev = __in6_dev_get(dev);
689 if (idev) {
690 int changed = (!idev->cnf.forwarding) ^ (!newf);
691 idev->cnf.forwarding = newf;
692 if (changed)
693 dev_forward_change(idev);
694 }
695 }
696 }
697
698 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
699 {
700 struct net *net;
701 int old;
702
703 if (!rtnl_trylock())
704 return restart_syscall();
705
706 net = (struct net *)table->extra2;
707 old = *p;
708 *p = newf;
709
710 if (p == &net->ipv6.devconf_dflt->forwarding) {
711 if ((!newf) ^ (!old))
712 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
713 NETCONFA_IFINDEX_DEFAULT,
714 net->ipv6.devconf_dflt);
715 rtnl_unlock();
716 return 0;
717 }
718
719 if (p == &net->ipv6.devconf_all->forwarding) {
720 net->ipv6.devconf_dflt->forwarding = newf;
721 addrconf_forward_change(net, newf);
722 if ((!newf) ^ (!old))
723 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
724 NETCONFA_IFINDEX_ALL,
725 net->ipv6.devconf_all);
726 } else if ((!newf) ^ (!old))
727 dev_forward_change((struct inet6_dev *)table->extra1);
728 rtnl_unlock();
729
730 if (newf)
731 rt6_purge_dflt_routers(net);
732 return 1;
733 }
734 #endif
735
736 /* Nobody refers to this ifaddr, destroy it */
737 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
738 {
739 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
740
741 #ifdef NET_REFCNT_DEBUG
742 pr_debug("%s\n", __func__);
743 #endif
744
745 in6_dev_put(ifp->idev);
746
747 if (del_timer(&ifp->dad_timer))
748 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
749
750 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
751 pr_warn("Freeing alive inet6 address %p\n", ifp);
752 return;
753 }
754 ip6_rt_put(ifp->rt);
755
756 kfree_rcu(ifp, rcu);
757 }
758
759 static void
760 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
761 {
762 struct list_head *p;
763 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
764
765 /*
766 * Each device address list is sorted in order of scope -
767 * global before linklocal.
768 */
769 list_for_each(p, &idev->addr_list) {
770 struct inet6_ifaddr *ifa
771 = list_entry(p, struct inet6_ifaddr, if_list);
772 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
773 break;
774 }
775
776 list_add_tail(&ifp->if_list, p);
777 }
778
779 static u32 inet6_addr_hash(const struct in6_addr *addr)
780 {
781 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
782 }
783
784 /* On success it returns ifp with increased reference count */
785
786 static struct inet6_ifaddr *
787 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
788 const struct in6_addr *peer_addr, int pfxlen,
789 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
790 {
791 struct inet6_ifaddr *ifa = NULL;
792 struct rt6_info *rt;
793 unsigned int hash;
794 int err = 0;
795 int addr_type = ipv6_addr_type(addr);
796
797 if (addr_type == IPV6_ADDR_ANY ||
798 addr_type & IPV6_ADDR_MULTICAST ||
799 (!(idev->dev->flags & IFF_LOOPBACK) &&
800 addr_type & IPV6_ADDR_LOOPBACK))
801 return ERR_PTR(-EADDRNOTAVAIL);
802
803 rcu_read_lock_bh();
804 if (idev->dead) {
805 err = -ENODEV; /*XXX*/
806 goto out2;
807 }
808
809 if (idev->cnf.disable_ipv6) {
810 err = -EACCES;
811 goto out2;
812 }
813
814 spin_lock(&addrconf_hash_lock);
815
816 /* Ignore adding duplicate addresses on an interface */
817 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
818 ADBG("ipv6_add_addr: already assigned\n");
819 err = -EEXIST;
820 goto out;
821 }
822
823 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
824
825 if (ifa == NULL) {
826 ADBG("ipv6_add_addr: malloc failed\n");
827 err = -ENOBUFS;
828 goto out;
829 }
830
831 rt = addrconf_dst_alloc(idev, addr, false);
832 if (IS_ERR(rt)) {
833 err = PTR_ERR(rt);
834 goto out;
835 }
836
837 ifa->addr = *addr;
838 if (peer_addr)
839 ifa->peer_addr = *peer_addr;
840
841 spin_lock_init(&ifa->lock);
842 spin_lock_init(&ifa->state_lock);
843 setup_timer(&ifa->dad_timer, addrconf_dad_timer,
844 (unsigned long)ifa);
845 INIT_HLIST_NODE(&ifa->addr_lst);
846 ifa->scope = scope;
847 ifa->prefix_len = pfxlen;
848 ifa->flags = flags | IFA_F_TENTATIVE;
849 ifa->valid_lft = valid_lft;
850 ifa->prefered_lft = prefered_lft;
851 ifa->cstamp = ifa->tstamp = jiffies;
852 ifa->tokenized = false;
853
854 ifa->rt = rt;
855
856 ifa->idev = idev;
857 in6_dev_hold(idev);
858 /* For caller */
859 in6_ifa_hold(ifa);
860
861 /* Add to big hash table */
862 hash = inet6_addr_hash(addr);
863
864 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
865 spin_unlock(&addrconf_hash_lock);
866
867 write_lock(&idev->lock);
868 /* Add to inet6_dev unicast addr list. */
869 ipv6_link_dev_addr(idev, ifa);
870
871 if (ifa->flags&IFA_F_TEMPORARY) {
872 list_add(&ifa->tmp_list, &idev->tempaddr_list);
873 in6_ifa_hold(ifa);
874 }
875
876 in6_ifa_hold(ifa);
877 write_unlock(&idev->lock);
878 out2:
879 rcu_read_unlock_bh();
880
881 if (likely(err == 0))
882 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
883 else {
884 kfree(ifa);
885 ifa = ERR_PTR(err);
886 }
887
888 return ifa;
889 out:
890 spin_unlock(&addrconf_hash_lock);
891 goto out2;
892 }
893
894 /* This function wants to get referenced ifp and releases it before return */
895
896 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
897 {
898 struct inet6_ifaddr *ifa, *ifn;
899 struct inet6_dev *idev = ifp->idev;
900 int state;
901 int deleted = 0, onlink = 0;
902 unsigned long expires = jiffies;
903
904 spin_lock_bh(&ifp->state_lock);
905 state = ifp->state;
906 ifp->state = INET6_IFADDR_STATE_DEAD;
907 spin_unlock_bh(&ifp->state_lock);
908
909 if (state == INET6_IFADDR_STATE_DEAD)
910 goto out;
911
912 spin_lock_bh(&addrconf_hash_lock);
913 hlist_del_init_rcu(&ifp->addr_lst);
914 spin_unlock_bh(&addrconf_hash_lock);
915
916 write_lock_bh(&idev->lock);
917
918 if (ifp->flags&IFA_F_TEMPORARY) {
919 list_del(&ifp->tmp_list);
920 if (ifp->ifpub) {
921 in6_ifa_put(ifp->ifpub);
922 ifp->ifpub = NULL;
923 }
924 __in6_ifa_put(ifp);
925 }
926
927 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
928 if (ifa == ifp) {
929 list_del_init(&ifp->if_list);
930 __in6_ifa_put(ifp);
931
932 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
933 break;
934 deleted = 1;
935 continue;
936 } else if (ifp->flags & IFA_F_PERMANENT) {
937 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
938 ifp->prefix_len)) {
939 if (ifa->flags & IFA_F_PERMANENT) {
940 onlink = 1;
941 if (deleted)
942 break;
943 } else {
944 unsigned long lifetime;
945
946 if (!onlink)
947 onlink = -1;
948
949 spin_lock(&ifa->lock);
950
951 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
952 /*
953 * Note: Because this address is
954 * not permanent, lifetime <
955 * LONG_MAX / HZ here.
956 */
957 if (time_before(expires,
958 ifa->tstamp + lifetime * HZ))
959 expires = ifa->tstamp + lifetime * HZ;
960 spin_unlock(&ifa->lock);
961 }
962 }
963 }
964 }
965 write_unlock_bh(&idev->lock);
966
967 addrconf_del_dad_timer(ifp);
968
969 ipv6_ifa_notify(RTM_DELADDR, ifp);
970
971 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
972
973 /*
974 * Purge or update corresponding prefix
975 *
976 * 1) we don't purge prefix here if address was not permanent.
977 * prefix is managed by its own lifetime.
978 * 2) if there're no addresses, delete prefix.
979 * 3) if there're still other permanent address(es),
980 * corresponding prefix is still permanent.
981 * 4) otherwise, update prefix lifetime to the
982 * longest valid lifetime among the corresponding
983 * addresses on the device.
984 * Note: subsequent RA will update lifetime.
985 *
986 * --yoshfuji
987 */
988 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
989 struct in6_addr prefix;
990 struct rt6_info *rt;
991
992 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
993
994 rt = addrconf_get_prefix_route(&prefix,
995 ifp->prefix_len,
996 ifp->idev->dev,
997 0, RTF_GATEWAY | RTF_DEFAULT);
998
999 if (rt) {
1000 if (onlink == 0) {
1001 ip6_del_rt(rt);
1002 rt = NULL;
1003 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1004 rt6_set_expires(rt, expires);
1005 }
1006 }
1007 ip6_rt_put(rt);
1008 }
1009
1010 /* clean up prefsrc entries */
1011 rt6_remove_prefsrc(ifp);
1012 out:
1013 in6_ifa_put(ifp);
1014 }
1015
1016 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1017 {
1018 struct inet6_dev *idev = ifp->idev;
1019 struct in6_addr addr, *tmpaddr;
1020 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1021 unsigned long regen_advance;
1022 int tmp_plen;
1023 int ret = 0;
1024 u32 addr_flags;
1025 unsigned long now = jiffies;
1026
1027 write_lock(&idev->lock);
1028 if (ift) {
1029 spin_lock_bh(&ift->lock);
1030 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1031 spin_unlock_bh(&ift->lock);
1032 tmpaddr = &addr;
1033 } else {
1034 tmpaddr = NULL;
1035 }
1036 retry:
1037 in6_dev_hold(idev);
1038 if (idev->cnf.use_tempaddr <= 0) {
1039 write_unlock(&idev->lock);
1040 pr_info("%s: use_tempaddr is disabled\n", __func__);
1041 in6_dev_put(idev);
1042 ret = -1;
1043 goto out;
1044 }
1045 spin_lock_bh(&ifp->lock);
1046 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1047 idev->cnf.use_tempaddr = -1; /*XXX*/
1048 spin_unlock_bh(&ifp->lock);
1049 write_unlock(&idev->lock);
1050 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1051 __func__);
1052 in6_dev_put(idev);
1053 ret = -1;
1054 goto out;
1055 }
1056 in6_ifa_hold(ifp);
1057 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1058 __ipv6_try_regen_rndid(idev, tmpaddr);
1059 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1060 age = (now - ifp->tstamp) / HZ;
1061 tmp_valid_lft = min_t(__u32,
1062 ifp->valid_lft,
1063 idev->cnf.temp_valid_lft + age);
1064 tmp_prefered_lft = min_t(__u32,
1065 ifp->prefered_lft,
1066 idev->cnf.temp_prefered_lft + age -
1067 idev->cnf.max_desync_factor);
1068 tmp_plen = ifp->prefix_len;
1069 tmp_tstamp = ifp->tstamp;
1070 spin_unlock_bh(&ifp->lock);
1071
1072 regen_advance = idev->cnf.regen_max_retry *
1073 idev->cnf.dad_transmits *
1074 idev->nd_parms->retrans_time / HZ;
1075 write_unlock(&idev->lock);
1076
1077 /* A temporary address is created only if this calculated Preferred
1078 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1079 * an implementation must not create a temporary address with a zero
1080 * Preferred Lifetime.
1081 */
1082 if (tmp_prefered_lft <= regen_advance) {
1083 in6_ifa_put(ifp);
1084 in6_dev_put(idev);
1085 ret = -1;
1086 goto out;
1087 }
1088
1089 addr_flags = IFA_F_TEMPORARY;
1090 /* set in addrconf_prefix_rcv() */
1091 if (ifp->flags & IFA_F_OPTIMISTIC)
1092 addr_flags |= IFA_F_OPTIMISTIC;
1093
1094 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1095 ipv6_addr_scope(&addr), addr_flags,
1096 tmp_valid_lft, tmp_prefered_lft);
1097 if (IS_ERR(ift)) {
1098 in6_ifa_put(ifp);
1099 in6_dev_put(idev);
1100 pr_info("%s: retry temporary address regeneration\n", __func__);
1101 tmpaddr = &addr;
1102 write_lock(&idev->lock);
1103 goto retry;
1104 }
1105
1106 spin_lock_bh(&ift->lock);
1107 ift->ifpub = ifp;
1108 ift->cstamp = now;
1109 ift->tstamp = tmp_tstamp;
1110 spin_unlock_bh(&ift->lock);
1111
1112 addrconf_dad_start(ift);
1113 in6_ifa_put(ift);
1114 in6_dev_put(idev);
1115 out:
1116 return ret;
1117 }
1118
1119 /*
1120 * Choose an appropriate source address (RFC3484)
1121 */
1122 enum {
1123 IPV6_SADDR_RULE_INIT = 0,
1124 IPV6_SADDR_RULE_LOCAL,
1125 IPV6_SADDR_RULE_SCOPE,
1126 IPV6_SADDR_RULE_PREFERRED,
1127 #ifdef CONFIG_IPV6_MIP6
1128 IPV6_SADDR_RULE_HOA,
1129 #endif
1130 IPV6_SADDR_RULE_OIF,
1131 IPV6_SADDR_RULE_LABEL,
1132 IPV6_SADDR_RULE_PRIVACY,
1133 IPV6_SADDR_RULE_ORCHID,
1134 IPV6_SADDR_RULE_PREFIX,
1135 IPV6_SADDR_RULE_MAX
1136 };
1137
1138 struct ipv6_saddr_score {
1139 int rule;
1140 int addr_type;
1141 struct inet6_ifaddr *ifa;
1142 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1143 int scopedist;
1144 int matchlen;
1145 };
1146
1147 struct ipv6_saddr_dst {
1148 const struct in6_addr *addr;
1149 int ifindex;
1150 int scope;
1151 int label;
1152 unsigned int prefs;
1153 };
1154
1155 static inline int ipv6_saddr_preferred(int type)
1156 {
1157 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1158 return 1;
1159 return 0;
1160 }
1161
1162 static int ipv6_get_saddr_eval(struct net *net,
1163 struct ipv6_saddr_score *score,
1164 struct ipv6_saddr_dst *dst,
1165 int i)
1166 {
1167 int ret;
1168
1169 if (i <= score->rule) {
1170 switch (i) {
1171 case IPV6_SADDR_RULE_SCOPE:
1172 ret = score->scopedist;
1173 break;
1174 case IPV6_SADDR_RULE_PREFIX:
1175 ret = score->matchlen;
1176 break;
1177 default:
1178 ret = !!test_bit(i, score->scorebits);
1179 }
1180 goto out;
1181 }
1182
1183 switch (i) {
1184 case IPV6_SADDR_RULE_INIT:
1185 /* Rule 0: remember if hiscore is not ready yet */
1186 ret = !!score->ifa;
1187 break;
1188 case IPV6_SADDR_RULE_LOCAL:
1189 /* Rule 1: Prefer same address */
1190 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1191 break;
1192 case IPV6_SADDR_RULE_SCOPE:
1193 /* Rule 2: Prefer appropriate scope
1194 *
1195 * ret
1196 * ^
1197 * -1 | d 15
1198 * ---+--+-+---> scope
1199 * |
1200 * | d is scope of the destination.
1201 * B-d | \
1202 * | \ <- smaller scope is better if
1203 * B-15 | \ if scope is enough for destinaion.
1204 * | ret = B - scope (-1 <= scope >= d <= 15).
1205 * d-C-1 | /
1206 * |/ <- greater is better
1207 * -C / if scope is not enough for destination.
1208 * /| ret = scope - C (-1 <= d < scope <= 15).
1209 *
1210 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1211 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1212 * Assume B = 0 and we get C > 29.
1213 */
1214 ret = __ipv6_addr_src_scope(score->addr_type);
1215 if (ret >= dst->scope)
1216 ret = -ret;
1217 else
1218 ret -= 128; /* 30 is enough */
1219 score->scopedist = ret;
1220 break;
1221 case IPV6_SADDR_RULE_PREFERRED:
1222 /* Rule 3: Avoid deprecated and optimistic addresses */
1223 ret = ipv6_saddr_preferred(score->addr_type) ||
1224 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1225 break;
1226 #ifdef CONFIG_IPV6_MIP6
1227 case IPV6_SADDR_RULE_HOA:
1228 {
1229 /* Rule 4: Prefer home address */
1230 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1231 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1232 break;
1233 }
1234 #endif
1235 case IPV6_SADDR_RULE_OIF:
1236 /* Rule 5: Prefer outgoing interface */
1237 ret = (!dst->ifindex ||
1238 dst->ifindex == score->ifa->idev->dev->ifindex);
1239 break;
1240 case IPV6_SADDR_RULE_LABEL:
1241 /* Rule 6: Prefer matching label */
1242 ret = ipv6_addr_label(net,
1243 &score->ifa->addr, score->addr_type,
1244 score->ifa->idev->dev->ifindex) == dst->label;
1245 break;
1246 case IPV6_SADDR_RULE_PRIVACY:
1247 {
1248 /* Rule 7: Prefer public address
1249 * Note: prefer temporary address if use_tempaddr >= 2
1250 */
1251 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1252 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1253 score->ifa->idev->cnf.use_tempaddr >= 2;
1254 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1255 break;
1256 }
1257 case IPV6_SADDR_RULE_ORCHID:
1258 /* Rule 8-: Prefer ORCHID vs ORCHID or
1259 * non-ORCHID vs non-ORCHID
1260 */
1261 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1262 ipv6_addr_orchid(dst->addr));
1263 break;
1264 case IPV6_SADDR_RULE_PREFIX:
1265 /* Rule 8: Use longest matching prefix */
1266 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1267 if (ret > score->ifa->prefix_len)
1268 ret = score->ifa->prefix_len;
1269 score->matchlen = ret;
1270 break;
1271 default:
1272 ret = 0;
1273 }
1274
1275 if (ret)
1276 __set_bit(i, score->scorebits);
1277 score->rule = i;
1278 out:
1279 return ret;
1280 }
1281
1282 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1283 const struct in6_addr *daddr, unsigned int prefs,
1284 struct in6_addr *saddr)
1285 {
1286 struct ipv6_saddr_score scores[2],
1287 *score = &scores[0], *hiscore = &scores[1];
1288 struct ipv6_saddr_dst dst;
1289 struct net_device *dev;
1290 int dst_type;
1291
1292 dst_type = __ipv6_addr_type(daddr);
1293 dst.addr = daddr;
1294 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1295 dst.scope = __ipv6_addr_src_scope(dst_type);
1296 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1297 dst.prefs = prefs;
1298
1299 hiscore->rule = -1;
1300 hiscore->ifa = NULL;
1301
1302 rcu_read_lock();
1303
1304 for_each_netdev_rcu(net, dev) {
1305 struct inet6_dev *idev;
1306
1307 /* Candidate Source Address (section 4)
1308 * - multicast and link-local destination address,
1309 * the set of candidate source address MUST only
1310 * include addresses assigned to interfaces
1311 * belonging to the same link as the outgoing
1312 * interface.
1313 * (- For site-local destination addresses, the
1314 * set of candidate source addresses MUST only
1315 * include addresses assigned to interfaces
1316 * belonging to the same site as the outgoing
1317 * interface.)
1318 */
1319 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1320 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1321 dst.ifindex && dev->ifindex != dst.ifindex)
1322 continue;
1323
1324 idev = __in6_dev_get(dev);
1325 if (!idev)
1326 continue;
1327
1328 read_lock_bh(&idev->lock);
1329 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1330 int i;
1331
1332 /*
1333 * - Tentative Address (RFC2462 section 5.4)
1334 * - A tentative address is not considered
1335 * "assigned to an interface" in the traditional
1336 * sense, unless it is also flagged as optimistic.
1337 * - Candidate Source Address (section 4)
1338 * - In any case, anycast addresses, multicast
1339 * addresses, and the unspecified address MUST
1340 * NOT be included in a candidate set.
1341 */
1342 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1343 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1344 continue;
1345
1346 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1347
1348 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1349 score->addr_type & IPV6_ADDR_MULTICAST)) {
1350 LIMIT_NETDEBUG(KERN_DEBUG
1351 "ADDRCONF: unspecified / multicast address "
1352 "assigned as unicast address on %s",
1353 dev->name);
1354 continue;
1355 }
1356
1357 score->rule = -1;
1358 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1359
1360 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1361 int minihiscore, miniscore;
1362
1363 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1364 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1365
1366 if (minihiscore > miniscore) {
1367 if (i == IPV6_SADDR_RULE_SCOPE &&
1368 score->scopedist > 0) {
1369 /*
1370 * special case:
1371 * each remaining entry
1372 * has too small (not enough)
1373 * scope, because ifa entries
1374 * are sorted by their scope
1375 * values.
1376 */
1377 goto try_nextdev;
1378 }
1379 break;
1380 } else if (minihiscore < miniscore) {
1381 if (hiscore->ifa)
1382 in6_ifa_put(hiscore->ifa);
1383
1384 in6_ifa_hold(score->ifa);
1385
1386 swap(hiscore, score);
1387
1388 /* restore our iterator */
1389 score->ifa = hiscore->ifa;
1390
1391 break;
1392 }
1393 }
1394 }
1395 try_nextdev:
1396 read_unlock_bh(&idev->lock);
1397 }
1398 rcu_read_unlock();
1399
1400 if (!hiscore->ifa)
1401 return -EADDRNOTAVAIL;
1402
1403 *saddr = hiscore->ifa->addr;
1404 in6_ifa_put(hiscore->ifa);
1405 return 0;
1406 }
1407 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1408
1409 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1410 unsigned char banned_flags)
1411 {
1412 struct inet6_ifaddr *ifp;
1413 int err = -EADDRNOTAVAIL;
1414
1415 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1416 if (ifp->scope == IFA_LINK &&
1417 !(ifp->flags & banned_flags)) {
1418 *addr = ifp->addr;
1419 err = 0;
1420 break;
1421 }
1422 }
1423 return err;
1424 }
1425
1426 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1427 unsigned char banned_flags)
1428 {
1429 struct inet6_dev *idev;
1430 int err = -EADDRNOTAVAIL;
1431
1432 rcu_read_lock();
1433 idev = __in6_dev_get(dev);
1434 if (idev) {
1435 read_lock_bh(&idev->lock);
1436 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1437 read_unlock_bh(&idev->lock);
1438 }
1439 rcu_read_unlock();
1440 return err;
1441 }
1442
1443 static int ipv6_count_addresses(struct inet6_dev *idev)
1444 {
1445 int cnt = 0;
1446 struct inet6_ifaddr *ifp;
1447
1448 read_lock_bh(&idev->lock);
1449 list_for_each_entry(ifp, &idev->addr_list, if_list)
1450 cnt++;
1451 read_unlock_bh(&idev->lock);
1452 return cnt;
1453 }
1454
1455 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1456 const struct net_device *dev, int strict)
1457 {
1458 struct inet6_ifaddr *ifp;
1459 unsigned int hash = inet6_addr_hash(addr);
1460
1461 rcu_read_lock_bh();
1462 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1463 if (!net_eq(dev_net(ifp->idev->dev), net))
1464 continue;
1465 if (ipv6_addr_equal(&ifp->addr, addr) &&
1466 !(ifp->flags&IFA_F_TENTATIVE) &&
1467 (dev == NULL || ifp->idev->dev == dev ||
1468 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1469 rcu_read_unlock_bh();
1470 return 1;
1471 }
1472 }
1473
1474 rcu_read_unlock_bh();
1475 return 0;
1476 }
1477 EXPORT_SYMBOL(ipv6_chk_addr);
1478
1479 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1480 struct net_device *dev)
1481 {
1482 unsigned int hash = inet6_addr_hash(addr);
1483 struct inet6_ifaddr *ifp;
1484
1485 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1486 if (!net_eq(dev_net(ifp->idev->dev), net))
1487 continue;
1488 if (ipv6_addr_equal(&ifp->addr, addr)) {
1489 if (dev == NULL || ifp->idev->dev == dev)
1490 return true;
1491 }
1492 }
1493 return false;
1494 }
1495
1496 /* Compares an address/prefix_len with addresses on device @dev.
1497 * If one is found it returns true.
1498 */
1499 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1500 const unsigned int prefix_len, struct net_device *dev)
1501 {
1502 struct inet6_dev *idev;
1503 struct inet6_ifaddr *ifa;
1504 bool ret = false;
1505
1506 rcu_read_lock();
1507 idev = __in6_dev_get(dev);
1508 if (idev) {
1509 read_lock_bh(&idev->lock);
1510 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1511 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1512 if (ret)
1513 break;
1514 }
1515 read_unlock_bh(&idev->lock);
1516 }
1517 rcu_read_unlock();
1518
1519 return ret;
1520 }
1521 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1522
1523 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1524 {
1525 struct inet6_dev *idev;
1526 struct inet6_ifaddr *ifa;
1527 int onlink;
1528
1529 onlink = 0;
1530 rcu_read_lock();
1531 idev = __in6_dev_get(dev);
1532 if (idev) {
1533 read_lock_bh(&idev->lock);
1534 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1535 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1536 ifa->prefix_len);
1537 if (onlink)
1538 break;
1539 }
1540 read_unlock_bh(&idev->lock);
1541 }
1542 rcu_read_unlock();
1543 return onlink;
1544 }
1545 EXPORT_SYMBOL(ipv6_chk_prefix);
1546
1547 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1548 struct net_device *dev, int strict)
1549 {
1550 struct inet6_ifaddr *ifp, *result = NULL;
1551 unsigned int hash = inet6_addr_hash(addr);
1552
1553 rcu_read_lock_bh();
1554 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1555 if (!net_eq(dev_net(ifp->idev->dev), net))
1556 continue;
1557 if (ipv6_addr_equal(&ifp->addr, addr)) {
1558 if (dev == NULL || ifp->idev->dev == dev ||
1559 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1560 result = ifp;
1561 in6_ifa_hold(ifp);
1562 break;
1563 }
1564 }
1565 }
1566 rcu_read_unlock_bh();
1567
1568 return result;
1569 }
1570
1571 /* Gets referenced address, destroys ifaddr */
1572
1573 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1574 {
1575 if (ifp->flags&IFA_F_PERMANENT) {
1576 spin_lock_bh(&ifp->lock);
1577 addrconf_del_dad_timer(ifp);
1578 ifp->flags |= IFA_F_TENTATIVE;
1579 if (dad_failed)
1580 ifp->flags |= IFA_F_DADFAILED;
1581 spin_unlock_bh(&ifp->lock);
1582 if (dad_failed)
1583 ipv6_ifa_notify(0, ifp);
1584 in6_ifa_put(ifp);
1585 } else if (ifp->flags&IFA_F_TEMPORARY) {
1586 struct inet6_ifaddr *ifpub;
1587 spin_lock_bh(&ifp->lock);
1588 ifpub = ifp->ifpub;
1589 if (ifpub) {
1590 in6_ifa_hold(ifpub);
1591 spin_unlock_bh(&ifp->lock);
1592 ipv6_create_tempaddr(ifpub, ifp);
1593 in6_ifa_put(ifpub);
1594 } else {
1595 spin_unlock_bh(&ifp->lock);
1596 }
1597 ipv6_del_addr(ifp);
1598 } else
1599 ipv6_del_addr(ifp);
1600 }
1601
1602 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1603 {
1604 int err = -ENOENT;
1605
1606 spin_lock(&ifp->state_lock);
1607 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1608 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1609 err = 0;
1610 }
1611 spin_unlock(&ifp->state_lock);
1612
1613 return err;
1614 }
1615
1616 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1617 {
1618 struct inet6_dev *idev = ifp->idev;
1619
1620 if (addrconf_dad_end(ifp)) {
1621 in6_ifa_put(ifp);
1622 return;
1623 }
1624
1625 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1626 ifp->idev->dev->name, &ifp->addr);
1627
1628 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1629 struct in6_addr addr;
1630
1631 addr.s6_addr32[0] = htonl(0xfe800000);
1632 addr.s6_addr32[1] = 0;
1633
1634 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1635 ipv6_addr_equal(&ifp->addr, &addr)) {
1636 /* DAD failed for link-local based on MAC address */
1637 idev->cnf.disable_ipv6 = 1;
1638
1639 pr_info("%s: IPv6 being disabled!\n",
1640 ifp->idev->dev->name);
1641 }
1642 }
1643
1644 addrconf_dad_stop(ifp, 1);
1645 }
1646
1647 /* Join to solicited addr multicast group. */
1648
1649 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1650 {
1651 struct in6_addr maddr;
1652
1653 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1654 return;
1655
1656 addrconf_addr_solict_mult(addr, &maddr);
1657 ipv6_dev_mc_inc(dev, &maddr);
1658 }
1659
1660 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1661 {
1662 struct in6_addr maddr;
1663
1664 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1665 return;
1666
1667 addrconf_addr_solict_mult(addr, &maddr);
1668 __ipv6_dev_mc_dec(idev, &maddr);
1669 }
1670
1671 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1672 {
1673 struct in6_addr addr;
1674 if (ifp->prefix_len == 127) /* RFC 6164 */
1675 return;
1676 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1677 if (ipv6_addr_any(&addr))
1678 return;
1679 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1680 }
1681
1682 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1683 {
1684 struct in6_addr addr;
1685 if (ifp->prefix_len == 127) /* RFC 6164 */
1686 return;
1687 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1688 if (ipv6_addr_any(&addr))
1689 return;
1690 __ipv6_dev_ac_dec(ifp->idev, &addr);
1691 }
1692
1693 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1694 {
1695 if (dev->addr_len != ETH_ALEN)
1696 return -1;
1697 memcpy(eui, dev->dev_addr, 3);
1698 memcpy(eui + 5, dev->dev_addr + 3, 3);
1699
1700 /*
1701 * The zSeries OSA network cards can be shared among various
1702 * OS instances, but the OSA cards have only one MAC address.
1703 * This leads to duplicate address conflicts in conjunction
1704 * with IPv6 if more than one instance uses the same card.
1705 *
1706 * The driver for these cards can deliver a unique 16-bit
1707 * identifier for each instance sharing the same card. It is
1708 * placed instead of 0xFFFE in the interface identifier. The
1709 * "u" bit of the interface identifier is not inverted in this
1710 * case. Hence the resulting interface identifier has local
1711 * scope according to RFC2373.
1712 */
1713 if (dev->dev_id) {
1714 eui[3] = (dev->dev_id >> 8) & 0xFF;
1715 eui[4] = dev->dev_id & 0xFF;
1716 } else {
1717 eui[3] = 0xFF;
1718 eui[4] = 0xFE;
1719 eui[0] ^= 2;
1720 }
1721 return 0;
1722 }
1723
1724 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1725 {
1726 if (dev->addr_len != IEEE802154_ADDR_LEN)
1727 return -1;
1728 memcpy(eui, dev->dev_addr, 8);
1729 eui[0] ^= 2;
1730 return 0;
1731 }
1732
1733 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1734 {
1735 union fwnet_hwaddr *ha;
1736
1737 if (dev->addr_len != FWNET_ALEN)
1738 return -1;
1739
1740 ha = (union fwnet_hwaddr *)dev->dev_addr;
1741
1742 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1743 eui[0] ^= 2;
1744 return 0;
1745 }
1746
1747 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1748 {
1749 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1750 if (dev->addr_len != ARCNET_ALEN)
1751 return -1;
1752 memset(eui, 0, 7);
1753 eui[7] = *(u8 *)dev->dev_addr;
1754 return 0;
1755 }
1756
1757 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1758 {
1759 if (dev->addr_len != INFINIBAND_ALEN)
1760 return -1;
1761 memcpy(eui, dev->dev_addr + 12, 8);
1762 eui[0] |= 2;
1763 return 0;
1764 }
1765
1766 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1767 {
1768 if (addr == 0)
1769 return -1;
1770 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1771 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1772 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1773 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1774 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1775 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1776 eui[1] = 0;
1777 eui[2] = 0x5E;
1778 eui[3] = 0xFE;
1779 memcpy(eui + 4, &addr, 4);
1780 return 0;
1781 }
1782
1783 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1784 {
1785 if (dev->priv_flags & IFF_ISATAP)
1786 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1787 return -1;
1788 }
1789
1790 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1791 {
1792 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1793 }
1794
1795 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1796 {
1797 memcpy(eui, dev->perm_addr, 3);
1798 memcpy(eui + 5, dev->perm_addr + 3, 3);
1799 eui[3] = 0xFF;
1800 eui[4] = 0xFE;
1801 eui[0] ^= 2;
1802 return 0;
1803 }
1804
1805 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1806 {
1807 switch (dev->type) {
1808 case ARPHRD_ETHER:
1809 case ARPHRD_FDDI:
1810 return addrconf_ifid_eui48(eui, dev);
1811 case ARPHRD_ARCNET:
1812 return addrconf_ifid_arcnet(eui, dev);
1813 case ARPHRD_INFINIBAND:
1814 return addrconf_ifid_infiniband(eui, dev);
1815 case ARPHRD_SIT:
1816 return addrconf_ifid_sit(eui, dev);
1817 case ARPHRD_IPGRE:
1818 return addrconf_ifid_gre(eui, dev);
1819 case ARPHRD_IEEE802154:
1820 return addrconf_ifid_eui64(eui, dev);
1821 case ARPHRD_IEEE1394:
1822 return addrconf_ifid_ieee1394(eui, dev);
1823 case ARPHRD_TUNNEL6:
1824 return addrconf_ifid_ip6tnl(eui, dev);
1825 }
1826 return -1;
1827 }
1828
1829 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1830 {
1831 int err = -1;
1832 struct inet6_ifaddr *ifp;
1833
1834 read_lock_bh(&idev->lock);
1835 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1836 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1837 memcpy(eui, ifp->addr.s6_addr+8, 8);
1838 err = 0;
1839 break;
1840 }
1841 }
1842 read_unlock_bh(&idev->lock);
1843 return err;
1844 }
1845
1846 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1847 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1848 {
1849 regen:
1850 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1851 idev->rndid[0] &= ~0x02;
1852
1853 /*
1854 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1855 * check if generated address is not inappropriate
1856 *
1857 * - Reserved subnet anycast (RFC 2526)
1858 * 11111101 11....11 1xxxxxxx
1859 * - ISATAP (RFC4214) 6.1
1860 * 00-00-5E-FE-xx-xx-xx-xx
1861 * - value 0
1862 * - XXX: already assigned to an address on the device
1863 */
1864 if (idev->rndid[0] == 0xfd &&
1865 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1866 (idev->rndid[7]&0x80))
1867 goto regen;
1868 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1869 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1870 goto regen;
1871 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1872 goto regen;
1873 }
1874 }
1875
1876 static void ipv6_regen_rndid(unsigned long data)
1877 {
1878 struct inet6_dev *idev = (struct inet6_dev *) data;
1879 unsigned long expires;
1880
1881 rcu_read_lock_bh();
1882 write_lock_bh(&idev->lock);
1883
1884 if (idev->dead)
1885 goto out;
1886
1887 __ipv6_regen_rndid(idev);
1888
1889 expires = jiffies +
1890 idev->cnf.temp_prefered_lft * HZ -
1891 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1892 idev->cnf.max_desync_factor * HZ;
1893 if (time_before(expires, jiffies)) {
1894 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1895 __func__, idev->dev->name);
1896 goto out;
1897 }
1898
1899 if (!mod_timer(&idev->regen_timer, expires))
1900 in6_dev_hold(idev);
1901
1902 out:
1903 write_unlock_bh(&idev->lock);
1904 rcu_read_unlock_bh();
1905 in6_dev_put(idev);
1906 }
1907
1908 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1909 {
1910 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1911 __ipv6_regen_rndid(idev);
1912 }
1913
1914 /*
1915 * Add prefix route.
1916 */
1917
1918 static void
1919 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1920 unsigned long expires, u32 flags)
1921 {
1922 struct fib6_config cfg = {
1923 .fc_table = RT6_TABLE_PREFIX,
1924 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1925 .fc_ifindex = dev->ifindex,
1926 .fc_expires = expires,
1927 .fc_dst_len = plen,
1928 .fc_flags = RTF_UP | flags,
1929 .fc_nlinfo.nl_net = dev_net(dev),
1930 .fc_protocol = RTPROT_KERNEL,
1931 };
1932
1933 cfg.fc_dst = *pfx;
1934
1935 /* Prevent useless cloning on PtP SIT.
1936 This thing is done here expecting that the whole
1937 class of non-broadcast devices need not cloning.
1938 */
1939 #if IS_ENABLED(CONFIG_IPV6_SIT)
1940 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1941 cfg.fc_flags |= RTF_NONEXTHOP;
1942 #endif
1943
1944 ip6_route_add(&cfg);
1945 }
1946
1947
1948 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1949 int plen,
1950 const struct net_device *dev,
1951 u32 flags, u32 noflags)
1952 {
1953 struct fib6_node *fn;
1954 struct rt6_info *rt = NULL;
1955 struct fib6_table *table;
1956
1957 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1958 if (table == NULL)
1959 return NULL;
1960
1961 read_lock_bh(&table->tb6_lock);
1962 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1963 if (!fn)
1964 goto out;
1965 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1966 if (rt->dst.dev->ifindex != dev->ifindex)
1967 continue;
1968 if ((rt->rt6i_flags & flags) != flags)
1969 continue;
1970 if ((rt->rt6i_flags & noflags) != 0)
1971 continue;
1972 dst_hold(&rt->dst);
1973 break;
1974 }
1975 out:
1976 read_unlock_bh(&table->tb6_lock);
1977 return rt;
1978 }
1979
1980
1981 /* Create "default" multicast route to the interface */
1982
1983 static void addrconf_add_mroute(struct net_device *dev)
1984 {
1985 struct fib6_config cfg = {
1986 .fc_table = RT6_TABLE_LOCAL,
1987 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1988 .fc_ifindex = dev->ifindex,
1989 .fc_dst_len = 8,
1990 .fc_flags = RTF_UP,
1991 .fc_nlinfo.nl_net = dev_net(dev),
1992 };
1993
1994 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1995
1996 ip6_route_add(&cfg);
1997 }
1998
1999 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2000 {
2001 struct inet6_dev *idev;
2002
2003 ASSERT_RTNL();
2004
2005 idev = ipv6_find_idev(dev);
2006 if (!idev)
2007 return ERR_PTR(-ENOBUFS);
2008
2009 if (idev->cnf.disable_ipv6)
2010 return ERR_PTR(-EACCES);
2011
2012 /* Add default multicast route */
2013 if (!(dev->flags & IFF_LOOPBACK))
2014 addrconf_add_mroute(dev);
2015
2016 return idev;
2017 }
2018
2019 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2020 {
2021 struct prefix_info *pinfo;
2022 __u32 valid_lft;
2023 __u32 prefered_lft;
2024 int addr_type;
2025 struct inet6_dev *in6_dev;
2026 struct net *net = dev_net(dev);
2027
2028 pinfo = (struct prefix_info *) opt;
2029
2030 if (len < sizeof(struct prefix_info)) {
2031 ADBG("addrconf: prefix option too short\n");
2032 return;
2033 }
2034
2035 /*
2036 * Validation checks ([ADDRCONF], page 19)
2037 */
2038
2039 addr_type = ipv6_addr_type(&pinfo->prefix);
2040
2041 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2042 return;
2043
2044 valid_lft = ntohl(pinfo->valid);
2045 prefered_lft = ntohl(pinfo->prefered);
2046
2047 if (prefered_lft > valid_lft) {
2048 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2049 return;
2050 }
2051
2052 in6_dev = in6_dev_get(dev);
2053
2054 if (in6_dev == NULL) {
2055 net_dbg_ratelimited("addrconf: device %s not configured\n",
2056 dev->name);
2057 return;
2058 }
2059
2060 /*
2061 * Two things going on here:
2062 * 1) Add routes for on-link prefixes
2063 * 2) Configure prefixes with the auto flag set
2064 */
2065
2066 if (pinfo->onlink) {
2067 struct rt6_info *rt;
2068 unsigned long rt_expires;
2069
2070 /* Avoid arithmetic overflow. Really, we could
2071 * save rt_expires in seconds, likely valid_lft,
2072 * but it would require division in fib gc, that it
2073 * not good.
2074 */
2075 if (HZ > USER_HZ)
2076 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2077 else
2078 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2079
2080 if (addrconf_finite_timeout(rt_expires))
2081 rt_expires *= HZ;
2082
2083 rt = addrconf_get_prefix_route(&pinfo->prefix,
2084 pinfo->prefix_len,
2085 dev,
2086 RTF_ADDRCONF | RTF_PREFIX_RT,
2087 RTF_GATEWAY | RTF_DEFAULT);
2088
2089 if (rt) {
2090 /* Autoconf prefix route */
2091 if (valid_lft == 0) {
2092 ip6_del_rt(rt);
2093 rt = NULL;
2094 } else if (addrconf_finite_timeout(rt_expires)) {
2095 /* not infinity */
2096 rt6_set_expires(rt, jiffies + rt_expires);
2097 } else {
2098 rt6_clean_expires(rt);
2099 }
2100 } else if (valid_lft) {
2101 clock_t expires = 0;
2102 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2103 if (addrconf_finite_timeout(rt_expires)) {
2104 /* not infinity */
2105 flags |= RTF_EXPIRES;
2106 expires = jiffies_to_clock_t(rt_expires);
2107 }
2108 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2109 dev, expires, flags);
2110 }
2111 ip6_rt_put(rt);
2112 }
2113
2114 /* Try to figure out our local address for this prefix */
2115
2116 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2117 struct inet6_ifaddr *ifp;
2118 struct in6_addr addr;
2119 int create = 0, update_lft = 0;
2120 bool tokenized = false;
2121
2122 if (pinfo->prefix_len == 64) {
2123 memcpy(&addr, &pinfo->prefix, 8);
2124
2125 if (!ipv6_addr_any(&in6_dev->token)) {
2126 read_lock_bh(&in6_dev->lock);
2127 memcpy(addr.s6_addr + 8,
2128 in6_dev->token.s6_addr + 8, 8);
2129 read_unlock_bh(&in6_dev->lock);
2130 tokenized = true;
2131 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2132 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2133 in6_dev_put(in6_dev);
2134 return;
2135 }
2136 goto ok;
2137 }
2138 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2139 pinfo->prefix_len);
2140 in6_dev_put(in6_dev);
2141 return;
2142
2143 ok:
2144
2145 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2146
2147 if (ifp == NULL && valid_lft) {
2148 int max_addresses = in6_dev->cnf.max_addresses;
2149 u32 addr_flags = 0;
2150
2151 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2152 if (in6_dev->cnf.optimistic_dad &&
2153 !net->ipv6.devconf_all->forwarding && sllao)
2154 addr_flags = IFA_F_OPTIMISTIC;
2155 #endif
2156
2157 /* Do not allow to create too much of autoconfigured
2158 * addresses; this would be too easy way to crash kernel.
2159 */
2160 if (!max_addresses ||
2161 ipv6_count_addresses(in6_dev) < max_addresses)
2162 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2163 pinfo->prefix_len,
2164 addr_type&IPV6_ADDR_SCOPE_MASK,
2165 addr_flags, valid_lft,
2166 prefered_lft);
2167
2168 if (IS_ERR_OR_NULL(ifp)) {
2169 in6_dev_put(in6_dev);
2170 return;
2171 }
2172
2173 update_lft = 0;
2174 create = 1;
2175 ifp->cstamp = jiffies;
2176 ifp->tokenized = tokenized;
2177 addrconf_dad_start(ifp);
2178 }
2179
2180 if (ifp) {
2181 int flags;
2182 unsigned long now;
2183 struct inet6_ifaddr *ift;
2184 u32 stored_lft;
2185
2186 /* update lifetime (RFC2462 5.5.3 e) */
2187 spin_lock(&ifp->lock);
2188 now = jiffies;
2189 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2190 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2191 else
2192 stored_lft = 0;
2193 if (!update_lft && !create && stored_lft) {
2194 const u32 minimum_lft = min(
2195 stored_lft, (u32)MIN_VALID_LIFETIME);
2196 valid_lft = max(valid_lft, minimum_lft);
2197
2198 /* RFC4862 Section 5.5.3e:
2199 * "Note that the preferred lifetime of the
2200 * corresponding address is always reset to
2201 * the Preferred Lifetime in the received
2202 * Prefix Information option, regardless of
2203 * whether the valid lifetime is also reset or
2204 * ignored."
2205 *
2206 * So we should always update prefered_lft here.
2207 */
2208 update_lft = 1;
2209 }
2210
2211 if (update_lft) {
2212 ifp->valid_lft = valid_lft;
2213 ifp->prefered_lft = prefered_lft;
2214 ifp->tstamp = now;
2215 flags = ifp->flags;
2216 ifp->flags &= ~IFA_F_DEPRECATED;
2217 spin_unlock(&ifp->lock);
2218
2219 if (!(flags&IFA_F_TENTATIVE))
2220 ipv6_ifa_notify(0, ifp);
2221 } else
2222 spin_unlock(&ifp->lock);
2223
2224 read_lock_bh(&in6_dev->lock);
2225 /* update all temporary addresses in the list */
2226 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2227 tmp_list) {
2228 int age, max_valid, max_prefered;
2229
2230 if (ifp != ift->ifpub)
2231 continue;
2232
2233 /*
2234 * RFC 4941 section 3.3:
2235 * If a received option will extend the lifetime
2236 * of a public address, the lifetimes of
2237 * temporary addresses should be extended,
2238 * subject to the overall constraint that no
2239 * temporary addresses should ever remain
2240 * "valid" or "preferred" for a time longer than
2241 * (TEMP_VALID_LIFETIME) or
2242 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2243 * respectively.
2244 */
2245 age = (now - ift->cstamp) / HZ;
2246 max_valid = in6_dev->cnf.temp_valid_lft - age;
2247 if (max_valid < 0)
2248 max_valid = 0;
2249
2250 max_prefered = in6_dev->cnf.temp_prefered_lft -
2251 in6_dev->cnf.max_desync_factor -
2252 age;
2253 if (max_prefered < 0)
2254 max_prefered = 0;
2255
2256 if (valid_lft > max_valid)
2257 valid_lft = max_valid;
2258
2259 if (prefered_lft > max_prefered)
2260 prefered_lft = max_prefered;
2261
2262 spin_lock(&ift->lock);
2263 flags = ift->flags;
2264 ift->valid_lft = valid_lft;
2265 ift->prefered_lft = prefered_lft;
2266 ift->tstamp = now;
2267 if (prefered_lft > 0)
2268 ift->flags &= ~IFA_F_DEPRECATED;
2269
2270 spin_unlock(&ift->lock);
2271 if (!(flags&IFA_F_TENTATIVE))
2272 ipv6_ifa_notify(0, ift);
2273 }
2274
2275 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2276 /*
2277 * When a new public address is created as
2278 * described in [ADDRCONF], also create a new
2279 * temporary address. Also create a temporary
2280 * address if it's enabled but no temporary
2281 * address currently exists.
2282 */
2283 read_unlock_bh(&in6_dev->lock);
2284 ipv6_create_tempaddr(ifp, NULL);
2285 } else {
2286 read_unlock_bh(&in6_dev->lock);
2287 }
2288
2289 in6_ifa_put(ifp);
2290 addrconf_verify(0);
2291 }
2292 }
2293 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2294 in6_dev_put(in6_dev);
2295 }
2296
2297 /*
2298 * Set destination address.
2299 * Special case for SIT interfaces where we create a new "virtual"
2300 * device.
2301 */
2302 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2303 {
2304 struct in6_ifreq ireq;
2305 struct net_device *dev;
2306 int err = -EINVAL;
2307
2308 rtnl_lock();
2309
2310 err = -EFAULT;
2311 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2312 goto err_exit;
2313
2314 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2315
2316 err = -ENODEV;
2317 if (dev == NULL)
2318 goto err_exit;
2319
2320 #if IS_ENABLED(CONFIG_IPV6_SIT)
2321 if (dev->type == ARPHRD_SIT) {
2322 const struct net_device_ops *ops = dev->netdev_ops;
2323 struct ifreq ifr;
2324 struct ip_tunnel_parm p;
2325
2326 err = -EADDRNOTAVAIL;
2327 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2328 goto err_exit;
2329
2330 memset(&p, 0, sizeof(p));
2331 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2332 p.iph.saddr = 0;
2333 p.iph.version = 4;
2334 p.iph.ihl = 5;
2335 p.iph.protocol = IPPROTO_IPV6;
2336 p.iph.ttl = 64;
2337 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2338
2339 if (ops->ndo_do_ioctl) {
2340 mm_segment_t oldfs = get_fs();
2341
2342 set_fs(KERNEL_DS);
2343 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2344 set_fs(oldfs);
2345 } else
2346 err = -EOPNOTSUPP;
2347
2348 if (err == 0) {
2349 err = -ENOBUFS;
2350 dev = __dev_get_by_name(net, p.name);
2351 if (!dev)
2352 goto err_exit;
2353 err = dev_open(dev);
2354 }
2355 }
2356 #endif
2357
2358 err_exit:
2359 rtnl_unlock();
2360 return err;
2361 }
2362
2363 /*
2364 * Manual configuration of address on an interface
2365 */
2366 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2367 const struct in6_addr *peer_pfx,
2368 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2369 __u32 valid_lft)
2370 {
2371 struct inet6_ifaddr *ifp;
2372 struct inet6_dev *idev;
2373 struct net_device *dev;
2374 int scope;
2375 u32 flags;
2376 clock_t expires;
2377 unsigned long timeout;
2378
2379 ASSERT_RTNL();
2380
2381 if (plen > 128)
2382 return -EINVAL;
2383
2384 /* check the lifetime */
2385 if (!valid_lft || prefered_lft > valid_lft)
2386 return -EINVAL;
2387
2388 dev = __dev_get_by_index(net, ifindex);
2389 if (!dev)
2390 return -ENODEV;
2391
2392 idev = addrconf_add_dev(dev);
2393 if (IS_ERR(idev))
2394 return PTR_ERR(idev);
2395
2396 scope = ipv6_addr_scope(pfx);
2397
2398 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2399 if (addrconf_finite_timeout(timeout)) {
2400 expires = jiffies_to_clock_t(timeout * HZ);
2401 valid_lft = timeout;
2402 flags = RTF_EXPIRES;
2403 } else {
2404 expires = 0;
2405 flags = 0;
2406 ifa_flags |= IFA_F_PERMANENT;
2407 }
2408
2409 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2410 if (addrconf_finite_timeout(timeout)) {
2411 if (timeout == 0)
2412 ifa_flags |= IFA_F_DEPRECATED;
2413 prefered_lft = timeout;
2414 }
2415
2416 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2417 valid_lft, prefered_lft);
2418
2419 if (!IS_ERR(ifp)) {
2420 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2421 expires, flags);
2422 /*
2423 * Note that section 3.1 of RFC 4429 indicates
2424 * that the Optimistic flag should not be set for
2425 * manually configured addresses
2426 */
2427 addrconf_dad_start(ifp);
2428 in6_ifa_put(ifp);
2429 addrconf_verify(0);
2430 return 0;
2431 }
2432
2433 return PTR_ERR(ifp);
2434 }
2435
2436 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2437 unsigned int plen)
2438 {
2439 struct inet6_ifaddr *ifp;
2440 struct inet6_dev *idev;
2441 struct net_device *dev;
2442
2443 if (plen > 128)
2444 return -EINVAL;
2445
2446 dev = __dev_get_by_index(net, ifindex);
2447 if (!dev)
2448 return -ENODEV;
2449
2450 if ((idev = __in6_dev_get(dev)) == NULL)
2451 return -ENXIO;
2452
2453 read_lock_bh(&idev->lock);
2454 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2455 if (ifp->prefix_len == plen &&
2456 ipv6_addr_equal(pfx, &ifp->addr)) {
2457 in6_ifa_hold(ifp);
2458 read_unlock_bh(&idev->lock);
2459
2460 ipv6_del_addr(ifp);
2461 return 0;
2462 }
2463 }
2464 read_unlock_bh(&idev->lock);
2465 return -EADDRNOTAVAIL;
2466 }
2467
2468
2469 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2470 {
2471 struct in6_ifreq ireq;
2472 int err;
2473
2474 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2475 return -EPERM;
2476
2477 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2478 return -EFAULT;
2479
2480 rtnl_lock();
2481 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2482 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2483 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2484 rtnl_unlock();
2485 return err;
2486 }
2487
2488 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2489 {
2490 struct in6_ifreq ireq;
2491 int err;
2492
2493 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2494 return -EPERM;
2495
2496 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2497 return -EFAULT;
2498
2499 rtnl_lock();
2500 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2501 ireq.ifr6_prefixlen);
2502 rtnl_unlock();
2503 return err;
2504 }
2505
2506 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2507 int plen, int scope)
2508 {
2509 struct inet6_ifaddr *ifp;
2510
2511 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2512 scope, IFA_F_PERMANENT, 0, 0);
2513 if (!IS_ERR(ifp)) {
2514 spin_lock_bh(&ifp->lock);
2515 ifp->flags &= ~IFA_F_TENTATIVE;
2516 spin_unlock_bh(&ifp->lock);
2517 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2518 in6_ifa_put(ifp);
2519 }
2520 }
2521
2522 #if IS_ENABLED(CONFIG_IPV6_SIT)
2523 static void sit_add_v4_addrs(struct inet6_dev *idev)
2524 {
2525 struct in6_addr addr;
2526 struct net_device *dev;
2527 struct net *net = dev_net(idev->dev);
2528 int scope, plen;
2529 u32 pflags = 0;
2530
2531 ASSERT_RTNL();
2532
2533 memset(&addr, 0, sizeof(struct in6_addr));
2534 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2535
2536 if (idev->dev->flags&IFF_POINTOPOINT) {
2537 addr.s6_addr32[0] = htonl(0xfe800000);
2538 scope = IFA_LINK;
2539 plen = 64;
2540 } else {
2541 scope = IPV6_ADDR_COMPATv4;
2542 plen = 96;
2543 pflags |= RTF_NONEXTHOP;
2544 }
2545
2546 if (addr.s6_addr32[3]) {
2547 add_addr(idev, &addr, plen, scope);
2548 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2549 return;
2550 }
2551
2552 for_each_netdev(net, dev) {
2553 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2554 if (in_dev && (dev->flags & IFF_UP)) {
2555 struct in_ifaddr *ifa;
2556
2557 int flag = scope;
2558
2559 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2560
2561 addr.s6_addr32[3] = ifa->ifa_local;
2562
2563 if (ifa->ifa_scope == RT_SCOPE_LINK)
2564 continue;
2565 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2566 if (idev->dev->flags&IFF_POINTOPOINT)
2567 continue;
2568 flag |= IFA_HOST;
2569 }
2570
2571 add_addr(idev, &addr, plen, flag);
2572 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2573 pflags);
2574 }
2575 }
2576 }
2577 }
2578 #endif
2579
2580 static void init_loopback(struct net_device *dev)
2581 {
2582 struct inet6_dev *idev;
2583 struct net_device *sp_dev;
2584 struct inet6_ifaddr *sp_ifa;
2585 struct rt6_info *sp_rt;
2586
2587 /* ::1 */
2588
2589 ASSERT_RTNL();
2590
2591 if ((idev = ipv6_find_idev(dev)) == NULL) {
2592 pr_debug("%s: add_dev failed\n", __func__);
2593 return;
2594 }
2595
2596 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2597
2598 /* Add routes to other interface's IPv6 addresses */
2599 for_each_netdev(dev_net(dev), sp_dev) {
2600 if (!strcmp(sp_dev->name, dev->name))
2601 continue;
2602
2603 idev = __in6_dev_get(sp_dev);
2604 if (!idev)
2605 continue;
2606
2607 read_lock_bh(&idev->lock);
2608 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2609
2610 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2611 continue;
2612
2613 if (sp_ifa->rt)
2614 continue;
2615
2616 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2617
2618 /* Failure cases are ignored */
2619 if (!IS_ERR(sp_rt)) {
2620 sp_ifa->rt = sp_rt;
2621 ip6_ins_rt(sp_rt);
2622 }
2623 }
2624 read_unlock_bh(&idev->lock);
2625 }
2626 }
2627
2628 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2629 {
2630 struct inet6_ifaddr *ifp;
2631 u32 addr_flags = IFA_F_PERMANENT;
2632
2633 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2634 if (idev->cnf.optimistic_dad &&
2635 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2636 addr_flags |= IFA_F_OPTIMISTIC;
2637 #endif
2638
2639
2640 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0);
2641 if (!IS_ERR(ifp)) {
2642 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2643 addrconf_dad_start(ifp);
2644 in6_ifa_put(ifp);
2645 }
2646 }
2647
2648 static void addrconf_dev_config(struct net_device *dev)
2649 {
2650 struct in6_addr addr;
2651 struct inet6_dev *idev;
2652
2653 ASSERT_RTNL();
2654
2655 if ((dev->type != ARPHRD_ETHER) &&
2656 (dev->type != ARPHRD_FDDI) &&
2657 (dev->type != ARPHRD_ARCNET) &&
2658 (dev->type != ARPHRD_INFINIBAND) &&
2659 (dev->type != ARPHRD_IEEE802154) &&
2660 (dev->type != ARPHRD_IEEE1394) &&
2661 (dev->type != ARPHRD_TUNNEL6)) {
2662 /* Alas, we support only Ethernet autoconfiguration. */
2663 return;
2664 }
2665
2666 idev = addrconf_add_dev(dev);
2667 if (IS_ERR(idev))
2668 return;
2669
2670 memset(&addr, 0, sizeof(struct in6_addr));
2671 addr.s6_addr32[0] = htonl(0xFE800000);
2672
2673 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2674 addrconf_add_linklocal(idev, &addr);
2675 }
2676
2677 #if IS_ENABLED(CONFIG_IPV6_SIT)
2678 static void addrconf_sit_config(struct net_device *dev)
2679 {
2680 struct inet6_dev *idev;
2681
2682 ASSERT_RTNL();
2683
2684 /*
2685 * Configure the tunnel with one of our IPv4
2686 * addresses... we should configure all of
2687 * our v4 addrs in the tunnel
2688 */
2689
2690 if ((idev = ipv6_find_idev(dev)) == NULL) {
2691 pr_debug("%s: add_dev failed\n", __func__);
2692 return;
2693 }
2694
2695 if (dev->priv_flags & IFF_ISATAP) {
2696 struct in6_addr addr;
2697
2698 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2699 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2700 addrconf_add_linklocal(idev, &addr);
2701 return;
2702 }
2703
2704 sit_add_v4_addrs(idev);
2705
2706 if (dev->flags&IFF_POINTOPOINT)
2707 addrconf_add_mroute(dev);
2708 }
2709 #endif
2710
2711 #if IS_ENABLED(CONFIG_NET_IPGRE)
2712 static void addrconf_gre_config(struct net_device *dev)
2713 {
2714 struct inet6_dev *idev;
2715 struct in6_addr addr;
2716
2717 ASSERT_RTNL();
2718
2719 if ((idev = ipv6_find_idev(dev)) == NULL) {
2720 pr_debug("%s: add_dev failed\n", __func__);
2721 return;
2722 }
2723
2724 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2725 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2726 addrconf_add_linklocal(idev, &addr);
2727 }
2728 #endif
2729
2730 static inline int
2731 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2732 {
2733 struct in6_addr lladdr;
2734
2735 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2736 addrconf_add_linklocal(idev, &lladdr);
2737 return 0;
2738 }
2739 return -1;
2740 }
2741
2742 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2743 void *ptr)
2744 {
2745 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2746 struct inet6_dev *idev = __in6_dev_get(dev);
2747 int run_pending = 0;
2748 int err;
2749
2750 switch (event) {
2751 case NETDEV_REGISTER:
2752 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2753 idev = ipv6_add_dev(dev);
2754 if (!idev)
2755 return notifier_from_errno(-ENOMEM);
2756 }
2757 break;
2758
2759 case NETDEV_UP:
2760 case NETDEV_CHANGE:
2761 if (dev->flags & IFF_SLAVE)
2762 break;
2763
2764 if (event == NETDEV_UP) {
2765 if (!addrconf_qdisc_ok(dev)) {
2766 /* device is not ready yet. */
2767 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2768 dev->name);
2769 break;
2770 }
2771
2772 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2773 idev = ipv6_add_dev(dev);
2774
2775 if (idev) {
2776 idev->if_flags |= IF_READY;
2777 run_pending = 1;
2778 }
2779 } else {
2780 if (!addrconf_qdisc_ok(dev)) {
2781 /* device is still not ready. */
2782 break;
2783 }
2784
2785 if (idev) {
2786 if (idev->if_flags & IF_READY)
2787 /* device is already configured. */
2788 break;
2789 idev->if_flags |= IF_READY;
2790 }
2791
2792 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2793 dev->name);
2794
2795 run_pending = 1;
2796 }
2797
2798 switch (dev->type) {
2799 #if IS_ENABLED(CONFIG_IPV6_SIT)
2800 case ARPHRD_SIT:
2801 addrconf_sit_config(dev);
2802 break;
2803 #endif
2804 #if IS_ENABLED(CONFIG_NET_IPGRE)
2805 case ARPHRD_IPGRE:
2806 addrconf_gre_config(dev);
2807 break;
2808 #endif
2809 case ARPHRD_LOOPBACK:
2810 init_loopback(dev);
2811 break;
2812
2813 default:
2814 addrconf_dev_config(dev);
2815 break;
2816 }
2817
2818 if (idev) {
2819 if (run_pending)
2820 addrconf_dad_run(idev);
2821
2822 /*
2823 * If the MTU changed during the interface down,
2824 * when the interface up, the changed MTU must be
2825 * reflected in the idev as well as routers.
2826 */
2827 if (idev->cnf.mtu6 != dev->mtu &&
2828 dev->mtu >= IPV6_MIN_MTU) {
2829 rt6_mtu_change(dev, dev->mtu);
2830 idev->cnf.mtu6 = dev->mtu;
2831 }
2832 idev->tstamp = jiffies;
2833 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2834
2835 /*
2836 * If the changed mtu during down is lower than
2837 * IPV6_MIN_MTU stop IPv6 on this interface.
2838 */
2839 if (dev->mtu < IPV6_MIN_MTU)
2840 addrconf_ifdown(dev, 1);
2841 }
2842 break;
2843
2844 case NETDEV_CHANGEMTU:
2845 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2846 rt6_mtu_change(dev, dev->mtu);
2847 idev->cnf.mtu6 = dev->mtu;
2848 break;
2849 }
2850
2851 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2852 idev = ipv6_add_dev(dev);
2853 if (idev)
2854 break;
2855 }
2856
2857 /*
2858 * MTU falled under IPV6_MIN_MTU.
2859 * Stop IPv6 on this interface.
2860 */
2861
2862 case NETDEV_DOWN:
2863 case NETDEV_UNREGISTER:
2864 /*
2865 * Remove all addresses from this interface.
2866 */
2867 addrconf_ifdown(dev, event != NETDEV_DOWN);
2868 break;
2869
2870 case NETDEV_CHANGENAME:
2871 if (idev) {
2872 snmp6_unregister_dev(idev);
2873 addrconf_sysctl_unregister(idev);
2874 addrconf_sysctl_register(idev);
2875 err = snmp6_register_dev(idev);
2876 if (err)
2877 return notifier_from_errno(err);
2878 }
2879 break;
2880
2881 case NETDEV_PRE_TYPE_CHANGE:
2882 case NETDEV_POST_TYPE_CHANGE:
2883 addrconf_type_change(dev, event);
2884 break;
2885 }
2886
2887 return NOTIFY_OK;
2888 }
2889
2890 /*
2891 * addrconf module should be notified of a device going up
2892 */
2893 static struct notifier_block ipv6_dev_notf = {
2894 .notifier_call = addrconf_notify,
2895 };
2896
2897 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2898 {
2899 struct inet6_dev *idev;
2900 ASSERT_RTNL();
2901
2902 idev = __in6_dev_get(dev);
2903
2904 if (event == NETDEV_POST_TYPE_CHANGE)
2905 ipv6_mc_remap(idev);
2906 else if (event == NETDEV_PRE_TYPE_CHANGE)
2907 ipv6_mc_unmap(idev);
2908 }
2909
2910 static int addrconf_ifdown(struct net_device *dev, int how)
2911 {
2912 struct net *net = dev_net(dev);
2913 struct inet6_dev *idev;
2914 struct inet6_ifaddr *ifa;
2915 int state, i;
2916
2917 ASSERT_RTNL();
2918
2919 rt6_ifdown(net, dev);
2920 neigh_ifdown(&nd_tbl, dev);
2921
2922 idev = __in6_dev_get(dev);
2923 if (idev == NULL)
2924 return -ENODEV;
2925
2926 /*
2927 * Step 1: remove reference to ipv6 device from parent device.
2928 * Do not dev_put!
2929 */
2930 if (how) {
2931 idev->dead = 1;
2932
2933 /* protected by rtnl_lock */
2934 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2935
2936 /* Step 1.5: remove snmp6 entry */
2937 snmp6_unregister_dev(idev);
2938
2939 }
2940
2941 /* Step 2: clear hash table */
2942 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2943 struct hlist_head *h = &inet6_addr_lst[i];
2944
2945 spin_lock_bh(&addrconf_hash_lock);
2946 restart:
2947 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
2948 if (ifa->idev == idev) {
2949 hlist_del_init_rcu(&ifa->addr_lst);
2950 addrconf_del_dad_timer(ifa);
2951 goto restart;
2952 }
2953 }
2954 spin_unlock_bh(&addrconf_hash_lock);
2955 }
2956
2957 write_lock_bh(&idev->lock);
2958
2959 addrconf_del_rs_timer(idev);
2960
2961 /* Step 2: clear flags for stateless addrconf */
2962 if (!how)
2963 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2964
2965 if (how && del_timer(&idev->regen_timer))
2966 in6_dev_put(idev);
2967
2968 /* Step 3: clear tempaddr list */
2969 while (!list_empty(&idev->tempaddr_list)) {
2970 ifa = list_first_entry(&idev->tempaddr_list,
2971 struct inet6_ifaddr, tmp_list);
2972 list_del(&ifa->tmp_list);
2973 write_unlock_bh(&idev->lock);
2974 spin_lock_bh(&ifa->lock);
2975
2976 if (ifa->ifpub) {
2977 in6_ifa_put(ifa->ifpub);
2978 ifa->ifpub = NULL;
2979 }
2980 spin_unlock_bh(&ifa->lock);
2981 in6_ifa_put(ifa);
2982 write_lock_bh(&idev->lock);
2983 }
2984
2985 while (!list_empty(&idev->addr_list)) {
2986 ifa = list_first_entry(&idev->addr_list,
2987 struct inet6_ifaddr, if_list);
2988 addrconf_del_dad_timer(ifa);
2989
2990 list_del(&ifa->if_list);
2991
2992 write_unlock_bh(&idev->lock);
2993
2994 spin_lock_bh(&ifa->state_lock);
2995 state = ifa->state;
2996 ifa->state = INET6_IFADDR_STATE_DEAD;
2997 spin_unlock_bh(&ifa->state_lock);
2998
2999 if (state != INET6_IFADDR_STATE_DEAD) {
3000 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3001 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3002 }
3003 in6_ifa_put(ifa);
3004
3005 write_lock_bh(&idev->lock);
3006 }
3007
3008 write_unlock_bh(&idev->lock);
3009
3010 /* Step 5: Discard multicast list */
3011 if (how)
3012 ipv6_mc_destroy_dev(idev);
3013 else
3014 ipv6_mc_down(idev);
3015
3016 idev->tstamp = jiffies;
3017
3018 /* Last: Shot the device (if unregistered) */
3019 if (how) {
3020 addrconf_sysctl_unregister(idev);
3021 neigh_parms_release(&nd_tbl, idev->nd_parms);
3022 neigh_ifdown(&nd_tbl, dev);
3023 in6_dev_put(idev);
3024 }
3025 return 0;
3026 }
3027
3028 static void addrconf_rs_timer(unsigned long data)
3029 {
3030 struct inet6_dev *idev = (struct inet6_dev *)data;
3031 struct net_device *dev = idev->dev;
3032 struct in6_addr lladdr;
3033
3034 write_lock(&idev->lock);
3035 if (idev->dead || !(idev->if_flags & IF_READY))
3036 goto out;
3037
3038 if (!ipv6_accept_ra(idev))
3039 goto out;
3040
3041 /* Announcement received after solicitation was sent */
3042 if (idev->if_flags & IF_RA_RCVD)
3043 goto out;
3044
3045 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3046 write_unlock(&idev->lock);
3047 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3048 ndisc_send_rs(dev, &lladdr,
3049 &in6addr_linklocal_allrouters);
3050 else
3051 goto put;
3052
3053 write_lock(&idev->lock);
3054 /* The wait after the last probe can be shorter */
3055 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3056 idev->cnf.rtr_solicits) ?
3057 idev->cnf.rtr_solicit_delay :
3058 idev->cnf.rtr_solicit_interval);
3059 } else {
3060 /*
3061 * Note: we do not support deprecated "all on-link"
3062 * assumption any longer.
3063 */
3064 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3065 }
3066
3067 out:
3068 write_unlock(&idev->lock);
3069 put:
3070 in6_dev_put(idev);
3071 }
3072
3073 /*
3074 * Duplicate Address Detection
3075 */
3076 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3077 {
3078 unsigned long rand_num;
3079 struct inet6_dev *idev = ifp->idev;
3080
3081 if (ifp->flags & IFA_F_OPTIMISTIC)
3082 rand_num = 0;
3083 else
3084 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3085
3086 ifp->dad_probes = idev->cnf.dad_transmits;
3087 addrconf_mod_dad_timer(ifp, rand_num);
3088 }
3089
3090 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3091 {
3092 struct inet6_dev *idev = ifp->idev;
3093 struct net_device *dev = idev->dev;
3094
3095 addrconf_join_solict(dev, &ifp->addr);
3096
3097 net_srandom(ifp->addr.s6_addr32[3]);
3098
3099 read_lock_bh(&idev->lock);
3100 spin_lock(&ifp->lock);
3101 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3102 goto out;
3103
3104 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3105 idev->cnf.accept_dad < 1 ||
3106 !(ifp->flags&IFA_F_TENTATIVE) ||
3107 ifp->flags & IFA_F_NODAD) {
3108 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3109 spin_unlock(&ifp->lock);
3110 read_unlock_bh(&idev->lock);
3111
3112 addrconf_dad_completed(ifp);
3113 return;
3114 }
3115
3116 if (!(idev->if_flags & IF_READY)) {
3117 spin_unlock(&ifp->lock);
3118 read_unlock_bh(&idev->lock);
3119 /*
3120 * If the device is not ready:
3121 * - keep it tentative if it is a permanent address.
3122 * - otherwise, kill it.
3123 */
3124 in6_ifa_hold(ifp);
3125 addrconf_dad_stop(ifp, 0);
3126 return;
3127 }
3128
3129 /*
3130 * Optimistic nodes can start receiving
3131 * Frames right away
3132 */
3133 if (ifp->flags & IFA_F_OPTIMISTIC)
3134 ip6_ins_rt(ifp->rt);
3135
3136 addrconf_dad_kick(ifp);
3137 out:
3138 spin_unlock(&ifp->lock);
3139 read_unlock_bh(&idev->lock);
3140 }
3141
3142 static void addrconf_dad_timer(unsigned long data)
3143 {
3144 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3145 struct inet6_dev *idev = ifp->idev;
3146 struct in6_addr mcaddr;
3147
3148 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3149 goto out;
3150
3151 write_lock(&idev->lock);
3152 if (idev->dead || !(idev->if_flags & IF_READY)) {
3153 write_unlock(&idev->lock);
3154 goto out;
3155 }
3156
3157 spin_lock(&ifp->lock);
3158 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3159 spin_unlock(&ifp->lock);
3160 write_unlock(&idev->lock);
3161 goto out;
3162 }
3163
3164 if (ifp->dad_probes == 0) {
3165 /*
3166 * DAD was successful
3167 */
3168
3169 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3170 spin_unlock(&ifp->lock);
3171 write_unlock(&idev->lock);
3172
3173 addrconf_dad_completed(ifp);
3174
3175 goto out;
3176 }
3177
3178 ifp->dad_probes--;
3179 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
3180 spin_unlock(&ifp->lock);
3181 write_unlock(&idev->lock);
3182
3183 /* send a neighbour solicitation for our addr */
3184 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3185 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3186 out:
3187 in6_ifa_put(ifp);
3188 }
3189
3190 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3191 {
3192 struct net_device *dev = ifp->idev->dev;
3193 struct in6_addr lladdr;
3194 bool send_rs, send_mld;
3195
3196 addrconf_del_dad_timer(ifp);
3197
3198 /*
3199 * Configure the address for reception. Now it is valid.
3200 */
3201
3202 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3203
3204 /* If added prefix is link local and we are prepared to process
3205 router advertisements, start sending router solicitations.
3206 */
3207
3208 read_lock_bh(&ifp->idev->lock);
3209 spin_lock(&ifp->lock);
3210 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3211 ifp->idev->valid_ll_addr_cnt == 1;
3212 send_rs = send_mld &&
3213 ipv6_accept_ra(ifp->idev) &&
3214 ifp->idev->cnf.rtr_solicits > 0 &&
3215 (dev->flags&IFF_LOOPBACK) == 0;
3216 spin_unlock(&ifp->lock);
3217 read_unlock_bh(&ifp->idev->lock);
3218
3219 /* While dad is in progress mld report's source address is in6_addrany.
3220 * Resend with proper ll now.
3221 */
3222 if (send_mld)
3223 ipv6_mc_dad_complete(ifp->idev);
3224
3225 if (send_rs) {
3226 /*
3227 * If a host as already performed a random delay
3228 * [...] as part of DAD [...] there is no need
3229 * to delay again before sending the first RS
3230 */
3231 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3232 return;
3233 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3234
3235 write_lock_bh(&ifp->idev->lock);
3236 spin_lock(&ifp->lock);
3237 ifp->idev->rs_probes = 1;
3238 ifp->idev->if_flags |= IF_RS_SENT;
3239 addrconf_mod_rs_timer(ifp->idev,
3240 ifp->idev->cnf.rtr_solicit_interval);
3241 spin_unlock(&ifp->lock);
3242 write_unlock_bh(&ifp->idev->lock);
3243 }
3244 }
3245
3246 static void addrconf_dad_run(struct inet6_dev *idev)
3247 {
3248 struct inet6_ifaddr *ifp;
3249
3250 read_lock_bh(&idev->lock);
3251 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3252 spin_lock(&ifp->lock);
3253 if (ifp->flags & IFA_F_TENTATIVE &&
3254 ifp->state == INET6_IFADDR_STATE_DAD)
3255 addrconf_dad_kick(ifp);
3256 spin_unlock(&ifp->lock);
3257 }
3258 read_unlock_bh(&idev->lock);
3259 }
3260
3261 #ifdef CONFIG_PROC_FS
3262 struct if6_iter_state {
3263 struct seq_net_private p;
3264 int bucket;
3265 int offset;
3266 };
3267
3268 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3269 {
3270 struct inet6_ifaddr *ifa = NULL;
3271 struct if6_iter_state *state = seq->private;
3272 struct net *net = seq_file_net(seq);
3273 int p = 0;
3274
3275 /* initial bucket if pos is 0 */
3276 if (pos == 0) {
3277 state->bucket = 0;
3278 state->offset = 0;
3279 }
3280
3281 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3282 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3283 addr_lst) {
3284 if (!net_eq(dev_net(ifa->idev->dev), net))
3285 continue;
3286 /* sync with offset */
3287 if (p < state->offset) {
3288 p++;
3289 continue;
3290 }
3291 state->offset++;
3292 return ifa;
3293 }
3294
3295 /* prepare for next bucket */
3296 state->offset = 0;
3297 p = 0;
3298 }
3299 return NULL;
3300 }
3301
3302 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3303 struct inet6_ifaddr *ifa)
3304 {
3305 struct if6_iter_state *state = seq->private;
3306 struct net *net = seq_file_net(seq);
3307
3308 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3309 if (!net_eq(dev_net(ifa->idev->dev), net))
3310 continue;
3311 state->offset++;
3312 return ifa;
3313 }
3314
3315 while (++state->bucket < IN6_ADDR_HSIZE) {
3316 state->offset = 0;
3317 hlist_for_each_entry_rcu_bh(ifa,
3318 &inet6_addr_lst[state->bucket], addr_lst) {
3319 if (!net_eq(dev_net(ifa->idev->dev), net))
3320 continue;
3321 state->offset++;
3322 return ifa;
3323 }
3324 }
3325
3326 return NULL;
3327 }
3328
3329 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3330 __acquires(rcu_bh)
3331 {
3332 rcu_read_lock_bh();
3333 return if6_get_first(seq, *pos);
3334 }
3335
3336 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3337 {
3338 struct inet6_ifaddr *ifa;
3339
3340 ifa = if6_get_next(seq, v);
3341 ++*pos;
3342 return ifa;
3343 }
3344
3345 static void if6_seq_stop(struct seq_file *seq, void *v)
3346 __releases(rcu_bh)
3347 {
3348 rcu_read_unlock_bh();
3349 }
3350
3351 static int if6_seq_show(struct seq_file *seq, void *v)
3352 {
3353 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3354 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3355 &ifp->addr,
3356 ifp->idev->dev->ifindex,
3357 ifp->prefix_len,
3358 ifp->scope,
3359 ifp->flags,
3360 ifp->idev->dev->name);
3361 return 0;
3362 }
3363
3364 static const struct seq_operations if6_seq_ops = {
3365 .start = if6_seq_start,
3366 .next = if6_seq_next,
3367 .show = if6_seq_show,
3368 .stop = if6_seq_stop,
3369 };
3370
3371 static int if6_seq_open(struct inode *inode, struct file *file)
3372 {
3373 return seq_open_net(inode, file, &if6_seq_ops,
3374 sizeof(struct if6_iter_state));
3375 }
3376
3377 static const struct file_operations if6_fops = {
3378 .owner = THIS_MODULE,
3379 .open = if6_seq_open,
3380 .read = seq_read,
3381 .llseek = seq_lseek,
3382 .release = seq_release_net,
3383 };
3384
3385 static int __net_init if6_proc_net_init(struct net *net)
3386 {
3387 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3388 return -ENOMEM;
3389 return 0;
3390 }
3391
3392 static void __net_exit if6_proc_net_exit(struct net *net)
3393 {
3394 remove_proc_entry("if_inet6", net->proc_net);
3395 }
3396
3397 static struct pernet_operations if6_proc_net_ops = {
3398 .init = if6_proc_net_init,
3399 .exit = if6_proc_net_exit,
3400 };
3401
3402 int __init if6_proc_init(void)
3403 {
3404 return register_pernet_subsys(&if6_proc_net_ops);
3405 }
3406
3407 void if6_proc_exit(void)
3408 {
3409 unregister_pernet_subsys(&if6_proc_net_ops);
3410 }
3411 #endif /* CONFIG_PROC_FS */
3412
3413 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3414 /* Check if address is a home address configured on any interface. */
3415 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3416 {
3417 int ret = 0;
3418 struct inet6_ifaddr *ifp = NULL;
3419 unsigned int hash = inet6_addr_hash(addr);
3420
3421 rcu_read_lock_bh();
3422 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3423 if (!net_eq(dev_net(ifp->idev->dev), net))
3424 continue;
3425 if (ipv6_addr_equal(&ifp->addr, addr) &&
3426 (ifp->flags & IFA_F_HOMEADDRESS)) {
3427 ret = 1;
3428 break;
3429 }
3430 }
3431 rcu_read_unlock_bh();
3432 return ret;
3433 }
3434 #endif
3435
3436 /*
3437 * Periodic address status verification
3438 */
3439
3440 static void addrconf_verify(unsigned long foo)
3441 {
3442 unsigned long now, next, next_sec, next_sched;
3443 struct inet6_ifaddr *ifp;
3444 int i;
3445
3446 rcu_read_lock_bh();
3447 spin_lock(&addrconf_verify_lock);
3448 now = jiffies;
3449 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3450
3451 del_timer(&addr_chk_timer);
3452
3453 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3454 restart:
3455 hlist_for_each_entry_rcu_bh(ifp,
3456 &inet6_addr_lst[i], addr_lst) {
3457 unsigned long age;
3458
3459 if (ifp->flags & IFA_F_PERMANENT)
3460 continue;
3461
3462 spin_lock(&ifp->lock);
3463 /* We try to batch several events at once. */
3464 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3465
3466 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3467 age >= ifp->valid_lft) {
3468 spin_unlock(&ifp->lock);
3469 in6_ifa_hold(ifp);
3470 ipv6_del_addr(ifp);
3471 goto restart;
3472 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3473 spin_unlock(&ifp->lock);
3474 continue;
3475 } else if (age >= ifp->prefered_lft) {
3476 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3477 int deprecate = 0;
3478
3479 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3480 deprecate = 1;
3481 ifp->flags |= IFA_F_DEPRECATED;
3482 }
3483
3484 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3485 next = ifp->tstamp + ifp->valid_lft * HZ;
3486
3487 spin_unlock(&ifp->lock);
3488
3489 if (deprecate) {
3490 in6_ifa_hold(ifp);
3491
3492 ipv6_ifa_notify(0, ifp);
3493 in6_ifa_put(ifp);
3494 goto restart;
3495 }
3496 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3497 !(ifp->flags&IFA_F_TENTATIVE)) {
3498 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3499 ifp->idev->cnf.dad_transmits *
3500 ifp->idev->nd_parms->retrans_time / HZ;
3501
3502 if (age >= ifp->prefered_lft - regen_advance) {
3503 struct inet6_ifaddr *ifpub = ifp->ifpub;
3504 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3505 next = ifp->tstamp + ifp->prefered_lft * HZ;
3506 if (!ifp->regen_count && ifpub) {
3507 ifp->regen_count++;
3508 in6_ifa_hold(ifp);
3509 in6_ifa_hold(ifpub);
3510 spin_unlock(&ifp->lock);
3511
3512 spin_lock(&ifpub->lock);
3513 ifpub->regen_count = 0;
3514 spin_unlock(&ifpub->lock);
3515 ipv6_create_tempaddr(ifpub, ifp);
3516 in6_ifa_put(ifpub);
3517 in6_ifa_put(ifp);
3518 goto restart;
3519 }
3520 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3521 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3522 spin_unlock(&ifp->lock);
3523 } else {
3524 /* ifp->prefered_lft <= ifp->valid_lft */
3525 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3526 next = ifp->tstamp + ifp->prefered_lft * HZ;
3527 spin_unlock(&ifp->lock);
3528 }
3529 }
3530 }
3531
3532 next_sec = round_jiffies_up(next);
3533 next_sched = next;
3534
3535 /* If rounded timeout is accurate enough, accept it. */
3536 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3537 next_sched = next_sec;
3538
3539 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3540 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3541 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3542
3543 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3544 now, next, next_sec, next_sched);
3545
3546 addr_chk_timer.expires = next_sched;
3547 add_timer(&addr_chk_timer);
3548 spin_unlock(&addrconf_verify_lock);
3549 rcu_read_unlock_bh();
3550 }
3551
3552 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3553 struct in6_addr **peer_pfx)
3554 {
3555 struct in6_addr *pfx = NULL;
3556
3557 *peer_pfx = NULL;
3558
3559 if (addr)
3560 pfx = nla_data(addr);
3561
3562 if (local) {
3563 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3564 *peer_pfx = pfx;
3565 pfx = nla_data(local);
3566 }
3567
3568 return pfx;
3569 }
3570
3571 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3572 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3573 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3574 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3575 };
3576
3577 static int
3578 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3579 {
3580 struct net *net = sock_net(skb->sk);
3581 struct ifaddrmsg *ifm;
3582 struct nlattr *tb[IFA_MAX+1];
3583 struct in6_addr *pfx, *peer_pfx;
3584 int err;
3585
3586 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3587 if (err < 0)
3588 return err;
3589
3590 ifm = nlmsg_data(nlh);
3591 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3592 if (pfx == NULL)
3593 return -EINVAL;
3594
3595 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3596 }
3597
3598 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3599 u32 prefered_lft, u32 valid_lft)
3600 {
3601 u32 flags;
3602 clock_t expires;
3603 unsigned long timeout;
3604
3605 if (!valid_lft || (prefered_lft > valid_lft))
3606 return -EINVAL;
3607
3608 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3609 if (addrconf_finite_timeout(timeout)) {
3610 expires = jiffies_to_clock_t(timeout * HZ);
3611 valid_lft = timeout;
3612 flags = RTF_EXPIRES;
3613 } else {
3614 expires = 0;
3615 flags = 0;
3616 ifa_flags |= IFA_F_PERMANENT;
3617 }
3618
3619 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3620 if (addrconf_finite_timeout(timeout)) {
3621 if (timeout == 0)
3622 ifa_flags |= IFA_F_DEPRECATED;
3623 prefered_lft = timeout;
3624 }
3625
3626 spin_lock_bh(&ifp->lock);
3627 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3628 ifp->tstamp = jiffies;
3629 ifp->valid_lft = valid_lft;
3630 ifp->prefered_lft = prefered_lft;
3631
3632 spin_unlock_bh(&ifp->lock);
3633 if (!(ifp->flags&IFA_F_TENTATIVE))
3634 ipv6_ifa_notify(0, ifp);
3635
3636 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3637 expires, flags);
3638 addrconf_verify(0);
3639
3640 return 0;
3641 }
3642
3643 static int
3644 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3645 {
3646 struct net *net = sock_net(skb->sk);
3647 struct ifaddrmsg *ifm;
3648 struct nlattr *tb[IFA_MAX+1];
3649 struct in6_addr *pfx, *peer_pfx;
3650 struct inet6_ifaddr *ifa;
3651 struct net_device *dev;
3652 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3653 u8 ifa_flags;
3654 int err;
3655
3656 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3657 if (err < 0)
3658 return err;
3659
3660 ifm = nlmsg_data(nlh);
3661 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3662 if (pfx == NULL)
3663 return -EINVAL;
3664
3665 if (tb[IFA_CACHEINFO]) {
3666 struct ifa_cacheinfo *ci;
3667
3668 ci = nla_data(tb[IFA_CACHEINFO]);
3669 valid_lft = ci->ifa_valid;
3670 preferred_lft = ci->ifa_prefered;
3671 } else {
3672 preferred_lft = INFINITY_LIFE_TIME;
3673 valid_lft = INFINITY_LIFE_TIME;
3674 }
3675
3676 dev = __dev_get_by_index(net, ifm->ifa_index);
3677 if (dev == NULL)
3678 return -ENODEV;
3679
3680 /* We ignore other flags so far. */
3681 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3682
3683 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3684 if (ifa == NULL) {
3685 /*
3686 * It would be best to check for !NLM_F_CREATE here but
3687 * userspace alreay relies on not having to provide this.
3688 */
3689 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3690 ifm->ifa_prefixlen, ifa_flags,
3691 preferred_lft, valid_lft);
3692 }
3693
3694 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3695 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3696 err = -EEXIST;
3697 else
3698 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3699
3700 in6_ifa_put(ifa);
3701
3702 return err;
3703 }
3704
3705 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3706 u8 scope, int ifindex)
3707 {
3708 struct ifaddrmsg *ifm;
3709
3710 ifm = nlmsg_data(nlh);
3711 ifm->ifa_family = AF_INET6;
3712 ifm->ifa_prefixlen = prefixlen;
3713 ifm->ifa_flags = flags;
3714 ifm->ifa_scope = scope;
3715 ifm->ifa_index = ifindex;
3716 }
3717
3718 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3719 unsigned long tstamp, u32 preferred, u32 valid)
3720 {
3721 struct ifa_cacheinfo ci;
3722
3723 ci.cstamp = cstamp_delta(cstamp);
3724 ci.tstamp = cstamp_delta(tstamp);
3725 ci.ifa_prefered = preferred;
3726 ci.ifa_valid = valid;
3727
3728 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3729 }
3730
3731 static inline int rt_scope(int ifa_scope)
3732 {
3733 if (ifa_scope & IFA_HOST)
3734 return RT_SCOPE_HOST;
3735 else if (ifa_scope & IFA_LINK)
3736 return RT_SCOPE_LINK;
3737 else if (ifa_scope & IFA_SITE)
3738 return RT_SCOPE_SITE;
3739 else
3740 return RT_SCOPE_UNIVERSE;
3741 }
3742
3743 static inline int inet6_ifaddr_msgsize(void)
3744 {
3745 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3746 + nla_total_size(16) /* IFA_LOCAL */
3747 + nla_total_size(16) /* IFA_ADDRESS */
3748 + nla_total_size(sizeof(struct ifa_cacheinfo));
3749 }
3750
3751 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3752 u32 portid, u32 seq, int event, unsigned int flags)
3753 {
3754 struct nlmsghdr *nlh;
3755 u32 preferred, valid;
3756
3757 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3758 if (nlh == NULL)
3759 return -EMSGSIZE;
3760
3761 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3762 ifa->idev->dev->ifindex);
3763
3764 if (!(ifa->flags&IFA_F_PERMANENT)) {
3765 preferred = ifa->prefered_lft;
3766 valid = ifa->valid_lft;
3767 if (preferred != INFINITY_LIFE_TIME) {
3768 long tval = (jiffies - ifa->tstamp)/HZ;
3769 if (preferred > tval)
3770 preferred -= tval;
3771 else
3772 preferred = 0;
3773 if (valid != INFINITY_LIFE_TIME) {
3774 if (valid > tval)
3775 valid -= tval;
3776 else
3777 valid = 0;
3778 }
3779 }
3780 } else {
3781 preferred = INFINITY_LIFE_TIME;
3782 valid = INFINITY_LIFE_TIME;
3783 }
3784
3785 if (!ipv6_addr_any(&ifa->peer_addr)) {
3786 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3787 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3788 goto error;
3789 } else
3790 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3791 goto error;
3792
3793 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3794 goto error;
3795
3796 return nlmsg_end(skb, nlh);
3797
3798 error:
3799 nlmsg_cancel(skb, nlh);
3800 return -EMSGSIZE;
3801 }
3802
3803 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3804 u32 portid, u32 seq, int event, u16 flags)
3805 {
3806 struct nlmsghdr *nlh;
3807 u8 scope = RT_SCOPE_UNIVERSE;
3808 int ifindex = ifmca->idev->dev->ifindex;
3809
3810 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3811 scope = RT_SCOPE_SITE;
3812
3813 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3814 if (nlh == NULL)
3815 return -EMSGSIZE;
3816
3817 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3818 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3819 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3820 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3821 nlmsg_cancel(skb, nlh);
3822 return -EMSGSIZE;
3823 }
3824
3825 return nlmsg_end(skb, nlh);
3826 }
3827
3828 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3829 u32 portid, u32 seq, int event, unsigned int flags)
3830 {
3831 struct nlmsghdr *nlh;
3832 u8 scope = RT_SCOPE_UNIVERSE;
3833 int ifindex = ifaca->aca_idev->dev->ifindex;
3834
3835 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3836 scope = RT_SCOPE_SITE;
3837
3838 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3839 if (nlh == NULL)
3840 return -EMSGSIZE;
3841
3842 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3843 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3844 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3845 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3846 nlmsg_cancel(skb, nlh);
3847 return -EMSGSIZE;
3848 }
3849
3850 return nlmsg_end(skb, nlh);
3851 }
3852
3853 enum addr_type_t {
3854 UNICAST_ADDR,
3855 MULTICAST_ADDR,
3856 ANYCAST_ADDR,
3857 };
3858
3859 /* called with rcu_read_lock() */
3860 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3861 struct netlink_callback *cb, enum addr_type_t type,
3862 int s_ip_idx, int *p_ip_idx)
3863 {
3864 struct ifmcaddr6 *ifmca;
3865 struct ifacaddr6 *ifaca;
3866 int err = 1;
3867 int ip_idx = *p_ip_idx;
3868
3869 read_lock_bh(&idev->lock);
3870 switch (type) {
3871 case UNICAST_ADDR: {
3872 struct inet6_ifaddr *ifa;
3873
3874 /* unicast address incl. temp addr */
3875 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3876 if (++ip_idx < s_ip_idx)
3877 continue;
3878 err = inet6_fill_ifaddr(skb, ifa,
3879 NETLINK_CB(cb->skb).portid,
3880 cb->nlh->nlmsg_seq,
3881 RTM_NEWADDR,
3882 NLM_F_MULTI);
3883 if (err <= 0)
3884 break;
3885 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3886 }
3887 break;
3888 }
3889 case MULTICAST_ADDR:
3890 /* multicast address */
3891 for (ifmca = idev->mc_list; ifmca;
3892 ifmca = ifmca->next, ip_idx++) {
3893 if (ip_idx < s_ip_idx)
3894 continue;
3895 err = inet6_fill_ifmcaddr(skb, ifmca,
3896 NETLINK_CB(cb->skb).portid,
3897 cb->nlh->nlmsg_seq,
3898 RTM_GETMULTICAST,
3899 NLM_F_MULTI);
3900 if (err <= 0)
3901 break;
3902 }
3903 break;
3904 case ANYCAST_ADDR:
3905 /* anycast address */
3906 for (ifaca = idev->ac_list; ifaca;
3907 ifaca = ifaca->aca_next, ip_idx++) {
3908 if (ip_idx < s_ip_idx)
3909 continue;
3910 err = inet6_fill_ifacaddr(skb, ifaca,
3911 NETLINK_CB(cb->skb).portid,
3912 cb->nlh->nlmsg_seq,
3913 RTM_GETANYCAST,
3914 NLM_F_MULTI);
3915 if (err <= 0)
3916 break;
3917 }
3918 break;
3919 default:
3920 break;
3921 }
3922 read_unlock_bh(&idev->lock);
3923 *p_ip_idx = ip_idx;
3924 return err;
3925 }
3926
3927 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3928 enum addr_type_t type)
3929 {
3930 struct net *net = sock_net(skb->sk);
3931 int h, s_h;
3932 int idx, ip_idx;
3933 int s_idx, s_ip_idx;
3934 struct net_device *dev;
3935 struct inet6_dev *idev;
3936 struct hlist_head *head;
3937
3938 s_h = cb->args[0];
3939 s_idx = idx = cb->args[1];
3940 s_ip_idx = ip_idx = cb->args[2];
3941
3942 rcu_read_lock();
3943 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
3944 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3945 idx = 0;
3946 head = &net->dev_index_head[h];
3947 hlist_for_each_entry_rcu(dev, head, index_hlist) {
3948 if (idx < s_idx)
3949 goto cont;
3950 if (h > s_h || idx > s_idx)
3951 s_ip_idx = 0;
3952 ip_idx = 0;
3953 idev = __in6_dev_get(dev);
3954 if (!idev)
3955 goto cont;
3956
3957 if (in6_dump_addrs(idev, skb, cb, type,
3958 s_ip_idx, &ip_idx) <= 0)
3959 goto done;
3960 cont:
3961 idx++;
3962 }
3963 }
3964 done:
3965 rcu_read_unlock();
3966 cb->args[0] = h;
3967 cb->args[1] = idx;
3968 cb->args[2] = ip_idx;
3969
3970 return skb->len;
3971 }
3972
3973 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3974 {
3975 enum addr_type_t type = UNICAST_ADDR;
3976
3977 return inet6_dump_addr(skb, cb, type);
3978 }
3979
3980 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3981 {
3982 enum addr_type_t type = MULTICAST_ADDR;
3983
3984 return inet6_dump_addr(skb, cb, type);
3985 }
3986
3987
3988 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3989 {
3990 enum addr_type_t type = ANYCAST_ADDR;
3991
3992 return inet6_dump_addr(skb, cb, type);
3993 }
3994
3995 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
3996 {
3997 struct net *net = sock_net(in_skb->sk);
3998 struct ifaddrmsg *ifm;
3999 struct nlattr *tb[IFA_MAX+1];
4000 struct in6_addr *addr = NULL, *peer;
4001 struct net_device *dev = NULL;
4002 struct inet6_ifaddr *ifa;
4003 struct sk_buff *skb;
4004 int err;
4005
4006 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4007 if (err < 0)
4008 goto errout;
4009
4010 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4011 if (addr == NULL) {
4012 err = -EINVAL;
4013 goto errout;
4014 }
4015
4016 ifm = nlmsg_data(nlh);
4017 if (ifm->ifa_index)
4018 dev = __dev_get_by_index(net, ifm->ifa_index);
4019
4020 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4021 if (!ifa) {
4022 err = -EADDRNOTAVAIL;
4023 goto errout;
4024 }
4025
4026 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4027 if (!skb) {
4028 err = -ENOBUFS;
4029 goto errout_ifa;
4030 }
4031
4032 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4033 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4034 if (err < 0) {
4035 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4036 WARN_ON(err == -EMSGSIZE);
4037 kfree_skb(skb);
4038 goto errout_ifa;
4039 }
4040 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4041 errout_ifa:
4042 in6_ifa_put(ifa);
4043 errout:
4044 return err;
4045 }
4046
4047 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4048 {
4049 struct sk_buff *skb;
4050 struct net *net = dev_net(ifa->idev->dev);
4051 int err = -ENOBUFS;
4052
4053 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4054 if (skb == NULL)
4055 goto errout;
4056
4057 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4058 if (err < 0) {
4059 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4060 WARN_ON(err == -EMSGSIZE);
4061 kfree_skb(skb);
4062 goto errout;
4063 }
4064 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4065 return;
4066 errout:
4067 if (err < 0)
4068 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4069 }
4070
4071 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4072 __s32 *array, int bytes)
4073 {
4074 BUG_ON(bytes < (DEVCONF_MAX * 4));
4075
4076 memset(array, 0, bytes);
4077 array[DEVCONF_FORWARDING] = cnf->forwarding;
4078 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4079 array[DEVCONF_MTU6] = cnf->mtu6;
4080 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4081 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4082 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4083 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4084 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4085 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4086 jiffies_to_msecs(cnf->rtr_solicit_interval);
4087 array[DEVCONF_RTR_SOLICIT_DELAY] =
4088 jiffies_to_msecs(cnf->rtr_solicit_delay);
4089 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4090 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4091 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4092 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4093 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4094 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4095 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4096 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4097 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4098 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4099 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4100 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4101 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4102 #ifdef CONFIG_IPV6_ROUTER_PREF
4103 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4104 array[DEVCONF_RTR_PROBE_INTERVAL] =
4105 jiffies_to_msecs(cnf->rtr_probe_interval);
4106 #ifdef CONFIG_IPV6_ROUTE_INFO
4107 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4108 #endif
4109 #endif
4110 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4111 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4112 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4113 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4114 #endif
4115 #ifdef CONFIG_IPV6_MROUTE
4116 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4117 #endif
4118 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4119 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4120 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4121 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4122 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4123 }
4124
4125 static inline size_t inet6_ifla6_size(void)
4126 {
4127 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4128 + nla_total_size(sizeof(struct ifla_cacheinfo))
4129 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4130 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4131 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4132 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4133 }
4134
4135 static inline size_t inet6_if_nlmsg_size(void)
4136 {
4137 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4138 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4139 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4140 + nla_total_size(4) /* IFLA_MTU */
4141 + nla_total_size(4) /* IFLA_LINK */
4142 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4143 }
4144
4145 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4146 int items, int bytes)
4147 {
4148 int i;
4149 int pad = bytes - sizeof(u64) * items;
4150 BUG_ON(pad < 0);
4151
4152 /* Use put_unaligned() because stats may not be aligned for u64. */
4153 put_unaligned(items, &stats[0]);
4154 for (i = 1; i < items; i++)
4155 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4156
4157 memset(&stats[items], 0, pad);
4158 }
4159
4160 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4161 int items, int bytes, size_t syncpoff)
4162 {
4163 int i;
4164 int pad = bytes - sizeof(u64) * items;
4165 BUG_ON(pad < 0);
4166
4167 /* Use put_unaligned() because stats may not be aligned for u64. */
4168 put_unaligned(items, &stats[0]);
4169 for (i = 1; i < items; i++)
4170 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4171
4172 memset(&stats[items], 0, pad);
4173 }
4174
4175 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4176 int bytes)
4177 {
4178 switch (attrtype) {
4179 case IFLA_INET6_STATS:
4180 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4181 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4182 break;
4183 case IFLA_INET6_ICMP6STATS:
4184 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4185 break;
4186 }
4187 }
4188
4189 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4190 {
4191 struct nlattr *nla;
4192 struct ifla_cacheinfo ci;
4193
4194 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4195 goto nla_put_failure;
4196 ci.max_reasm_len = IPV6_MAXPLEN;
4197 ci.tstamp = cstamp_delta(idev->tstamp);
4198 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4199 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4200 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4201 goto nla_put_failure;
4202 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4203 if (nla == NULL)
4204 goto nla_put_failure;
4205 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4206
4207 /* XXX - MC not implemented */
4208
4209 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4210 if (nla == NULL)
4211 goto nla_put_failure;
4212 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4213
4214 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4215 if (nla == NULL)
4216 goto nla_put_failure;
4217 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4218
4219 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4220 if (nla == NULL)
4221 goto nla_put_failure;
4222 read_lock_bh(&idev->lock);
4223 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4224 read_unlock_bh(&idev->lock);
4225
4226 return 0;
4227
4228 nla_put_failure:
4229 return -EMSGSIZE;
4230 }
4231
4232 static size_t inet6_get_link_af_size(const struct net_device *dev)
4233 {
4234 if (!__in6_dev_get(dev))
4235 return 0;
4236
4237 return inet6_ifla6_size();
4238 }
4239
4240 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4241 {
4242 struct inet6_dev *idev = __in6_dev_get(dev);
4243
4244 if (!idev)
4245 return -ENODATA;
4246
4247 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4248 return -EMSGSIZE;
4249
4250 return 0;
4251 }
4252
4253 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4254 {
4255 struct inet6_ifaddr *ifp;
4256 struct net_device *dev = idev->dev;
4257 bool update_rs = false;
4258 struct in6_addr ll_addr;
4259
4260 if (token == NULL)
4261 return -EINVAL;
4262 if (ipv6_addr_any(token))
4263 return -EINVAL;
4264 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4265 return -EINVAL;
4266 if (!ipv6_accept_ra(idev))
4267 return -EINVAL;
4268 if (idev->cnf.rtr_solicits <= 0)
4269 return -EINVAL;
4270
4271 write_lock_bh(&idev->lock);
4272
4273 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4274 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4275
4276 write_unlock_bh(&idev->lock);
4277
4278 if (!idev->dead && (idev->if_flags & IF_READY) &&
4279 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4280 IFA_F_OPTIMISTIC)) {
4281
4282 /* If we're not ready, then normal ifup will take care
4283 * of this. Otherwise, we need to request our rs here.
4284 */
4285 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4286 update_rs = true;
4287 }
4288
4289 write_lock_bh(&idev->lock);
4290
4291 if (update_rs) {
4292 idev->if_flags |= IF_RS_SENT;
4293 idev->rs_probes = 1;
4294 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4295 }
4296
4297 /* Well, that's kinda nasty ... */
4298 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4299 spin_lock(&ifp->lock);
4300 if (ifp->tokenized) {
4301 ifp->valid_lft = 0;
4302 ifp->prefered_lft = 0;
4303 }
4304 spin_unlock(&ifp->lock);
4305 }
4306
4307 write_unlock_bh(&idev->lock);
4308 addrconf_verify(0);
4309 return 0;
4310 }
4311
4312 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4313 {
4314 int err = -EINVAL;
4315 struct inet6_dev *idev = __in6_dev_get(dev);
4316 struct nlattr *tb[IFLA_INET6_MAX + 1];
4317
4318 if (!idev)
4319 return -EAFNOSUPPORT;
4320
4321 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4322 BUG();
4323
4324 if (tb[IFLA_INET6_TOKEN])
4325 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4326
4327 return err;
4328 }
4329
4330 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4331 u32 portid, u32 seq, int event, unsigned int flags)
4332 {
4333 struct net_device *dev = idev->dev;
4334 struct ifinfomsg *hdr;
4335 struct nlmsghdr *nlh;
4336 void *protoinfo;
4337
4338 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4339 if (nlh == NULL)
4340 return -EMSGSIZE;
4341
4342 hdr = nlmsg_data(nlh);
4343 hdr->ifi_family = AF_INET6;
4344 hdr->__ifi_pad = 0;
4345 hdr->ifi_type = dev->type;
4346 hdr->ifi_index = dev->ifindex;
4347 hdr->ifi_flags = dev_get_flags(dev);
4348 hdr->ifi_change = 0;
4349
4350 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4351 (dev->addr_len &&
4352 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4353 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4354 (dev->ifindex != dev->iflink &&
4355 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4356 goto nla_put_failure;
4357 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4358 if (protoinfo == NULL)
4359 goto nla_put_failure;
4360
4361 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4362 goto nla_put_failure;
4363
4364 nla_nest_end(skb, protoinfo);
4365 return nlmsg_end(skb, nlh);
4366
4367 nla_put_failure:
4368 nlmsg_cancel(skb, nlh);
4369 return -EMSGSIZE;
4370 }
4371
4372 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4373 {
4374 struct net *net = sock_net(skb->sk);
4375 int h, s_h;
4376 int idx = 0, s_idx;
4377 struct net_device *dev;
4378 struct inet6_dev *idev;
4379 struct hlist_head *head;
4380
4381 s_h = cb->args[0];
4382 s_idx = cb->args[1];
4383
4384 rcu_read_lock();
4385 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4386 idx = 0;
4387 head = &net->dev_index_head[h];
4388 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4389 if (idx < s_idx)
4390 goto cont;
4391 idev = __in6_dev_get(dev);
4392 if (!idev)
4393 goto cont;
4394 if (inet6_fill_ifinfo(skb, idev,
4395 NETLINK_CB(cb->skb).portid,
4396 cb->nlh->nlmsg_seq,
4397 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4398 goto out;
4399 cont:
4400 idx++;
4401 }
4402 }
4403 out:
4404 rcu_read_unlock();
4405 cb->args[1] = idx;
4406 cb->args[0] = h;
4407
4408 return skb->len;
4409 }
4410
4411 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4412 {
4413 struct sk_buff *skb;
4414 struct net *net = dev_net(idev->dev);
4415 int err = -ENOBUFS;
4416
4417 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4418 if (skb == NULL)
4419 goto errout;
4420
4421 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4422 if (err < 0) {
4423 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4424 WARN_ON(err == -EMSGSIZE);
4425 kfree_skb(skb);
4426 goto errout;
4427 }
4428 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4429 return;
4430 errout:
4431 if (err < 0)
4432 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4433 }
4434
4435 static inline size_t inet6_prefix_nlmsg_size(void)
4436 {
4437 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4438 + nla_total_size(sizeof(struct in6_addr))
4439 + nla_total_size(sizeof(struct prefix_cacheinfo));
4440 }
4441
4442 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4443 struct prefix_info *pinfo, u32 portid, u32 seq,
4444 int event, unsigned int flags)
4445 {
4446 struct prefixmsg *pmsg;
4447 struct nlmsghdr *nlh;
4448 struct prefix_cacheinfo ci;
4449
4450 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4451 if (nlh == NULL)
4452 return -EMSGSIZE;
4453
4454 pmsg = nlmsg_data(nlh);
4455 pmsg->prefix_family = AF_INET6;
4456 pmsg->prefix_pad1 = 0;
4457 pmsg->prefix_pad2 = 0;
4458 pmsg->prefix_ifindex = idev->dev->ifindex;
4459 pmsg->prefix_len = pinfo->prefix_len;
4460 pmsg->prefix_type = pinfo->type;
4461 pmsg->prefix_pad3 = 0;
4462 pmsg->prefix_flags = 0;
4463 if (pinfo->onlink)
4464 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4465 if (pinfo->autoconf)
4466 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4467
4468 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4469 goto nla_put_failure;
4470 ci.preferred_time = ntohl(pinfo->prefered);
4471 ci.valid_time = ntohl(pinfo->valid);
4472 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4473 goto nla_put_failure;
4474 return nlmsg_end(skb, nlh);
4475
4476 nla_put_failure:
4477 nlmsg_cancel(skb, nlh);
4478 return -EMSGSIZE;
4479 }
4480
4481 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4482 struct prefix_info *pinfo)
4483 {
4484 struct sk_buff *skb;
4485 struct net *net = dev_net(idev->dev);
4486 int err = -ENOBUFS;
4487
4488 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4489 if (skb == NULL)
4490 goto errout;
4491
4492 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4493 if (err < 0) {
4494 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4495 WARN_ON(err == -EMSGSIZE);
4496 kfree_skb(skb);
4497 goto errout;
4498 }
4499 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4500 return;
4501 errout:
4502 if (err < 0)
4503 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4504 }
4505
4506 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4507 {
4508 write_lock_bh(&ifp->idev->lock);
4509 spin_lock(&ifp->lock);
4510 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4511 IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4512 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4513 ifp->idev->valid_ll_addr_cnt += count;
4514 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4515 spin_unlock(&ifp->lock);
4516 write_unlock_bh(&ifp->idev->lock);
4517 }
4518
4519 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4520 {
4521 struct net *net = dev_net(ifp->idev->dev);
4522
4523 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4524
4525 switch (event) {
4526 case RTM_NEWADDR:
4527 update_valid_ll_addr_cnt(ifp, 1);
4528
4529 /*
4530 * If the address was optimistic
4531 * we inserted the route at the start of
4532 * our DAD process, so we don't need
4533 * to do it again
4534 */
4535 if (!(ifp->rt->rt6i_node))
4536 ip6_ins_rt(ifp->rt);
4537 if (ifp->idev->cnf.forwarding)
4538 addrconf_join_anycast(ifp);
4539 if (!ipv6_addr_any(&ifp->peer_addr))
4540 addrconf_prefix_route(&ifp->peer_addr, 128,
4541 ifp->idev->dev, 0, 0);
4542 break;
4543 case RTM_DELADDR:
4544 update_valid_ll_addr_cnt(ifp, -1);
4545
4546 if (ifp->idev->cnf.forwarding)
4547 addrconf_leave_anycast(ifp);
4548 addrconf_leave_solict(ifp->idev, &ifp->addr);
4549 if (!ipv6_addr_any(&ifp->peer_addr)) {
4550 struct rt6_info *rt;
4551 struct net_device *dev = ifp->idev->dev;
4552
4553 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4554 dev->ifindex, 1);
4555 if (rt) {
4556 dst_hold(&rt->dst);
4557 if (ip6_del_rt(rt))
4558 dst_free(&rt->dst);
4559 }
4560 }
4561 dst_hold(&ifp->rt->dst);
4562
4563 if (ip6_del_rt(ifp->rt))
4564 dst_free(&ifp->rt->dst);
4565 break;
4566 }
4567 atomic_inc(&net->ipv6.dev_addr_genid);
4568 rt_genid_bump_ipv6(net);
4569 }
4570
4571 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4572 {
4573 rcu_read_lock_bh();
4574 if (likely(ifp->idev->dead == 0))
4575 __ipv6_ifa_notify(event, ifp);
4576 rcu_read_unlock_bh();
4577 }
4578
4579 #ifdef CONFIG_SYSCTL
4580
4581 static
4582 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4583 void __user *buffer, size_t *lenp, loff_t *ppos)
4584 {
4585 int *valp = ctl->data;
4586 int val = *valp;
4587 loff_t pos = *ppos;
4588 struct ctl_table lctl;
4589 int ret;
4590
4591 /*
4592 * ctl->data points to idev->cnf.forwarding, we should
4593 * not modify it until we get the rtnl lock.
4594 */
4595 lctl = *ctl;
4596 lctl.data = &val;
4597
4598 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4599
4600 if (write)
4601 ret = addrconf_fixup_forwarding(ctl, valp, val);
4602 if (ret)
4603 *ppos = pos;
4604 return ret;
4605 }
4606
4607 static void dev_disable_change(struct inet6_dev *idev)
4608 {
4609 struct netdev_notifier_info info;
4610
4611 if (!idev || !idev->dev)
4612 return;
4613
4614 netdev_notifier_info_init(&info, idev->dev);
4615 if (idev->cnf.disable_ipv6)
4616 addrconf_notify(NULL, NETDEV_DOWN, &info);
4617 else
4618 addrconf_notify(NULL, NETDEV_UP, &info);
4619 }
4620
4621 static void addrconf_disable_change(struct net *net, __s32 newf)
4622 {
4623 struct net_device *dev;
4624 struct inet6_dev *idev;
4625
4626 rcu_read_lock();
4627 for_each_netdev_rcu(net, dev) {
4628 idev = __in6_dev_get(dev);
4629 if (idev) {
4630 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4631 idev->cnf.disable_ipv6 = newf;
4632 if (changed)
4633 dev_disable_change(idev);
4634 }
4635 }
4636 rcu_read_unlock();
4637 }
4638
4639 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4640 {
4641 struct net *net;
4642 int old;
4643
4644 if (!rtnl_trylock())
4645 return restart_syscall();
4646
4647 net = (struct net *)table->extra2;
4648 old = *p;
4649 *p = newf;
4650
4651 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4652 rtnl_unlock();
4653 return 0;
4654 }
4655
4656 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4657 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4658 addrconf_disable_change(net, newf);
4659 } else if ((!newf) ^ (!old))
4660 dev_disable_change((struct inet6_dev *)table->extra1);
4661
4662 rtnl_unlock();
4663 return 0;
4664 }
4665
4666 static
4667 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4668 void __user *buffer, size_t *lenp, loff_t *ppos)
4669 {
4670 int *valp = ctl->data;
4671 int val = *valp;
4672 loff_t pos = *ppos;
4673 struct ctl_table lctl;
4674 int ret;
4675
4676 /*
4677 * ctl->data points to idev->cnf.disable_ipv6, we should
4678 * not modify it until we get the rtnl lock.
4679 */
4680 lctl = *ctl;
4681 lctl.data = &val;
4682
4683 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4684
4685 if (write)
4686 ret = addrconf_disable_ipv6(ctl, valp, val);
4687 if (ret)
4688 *ppos = pos;
4689 return ret;
4690 }
4691
4692 static struct addrconf_sysctl_table
4693 {
4694 struct ctl_table_header *sysctl_header;
4695 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4696 } addrconf_sysctl __read_mostly = {
4697 .sysctl_header = NULL,
4698 .addrconf_vars = {
4699 {
4700 .procname = "forwarding",
4701 .data = &ipv6_devconf.forwarding,
4702 .maxlen = sizeof(int),
4703 .mode = 0644,
4704 .proc_handler = addrconf_sysctl_forward,
4705 },
4706 {
4707 .procname = "hop_limit",
4708 .data = &ipv6_devconf.hop_limit,
4709 .maxlen = sizeof(int),
4710 .mode = 0644,
4711 .proc_handler = proc_dointvec,
4712 },
4713 {
4714 .procname = "mtu",
4715 .data = &ipv6_devconf.mtu6,
4716 .maxlen = sizeof(int),
4717 .mode = 0644,
4718 .proc_handler = proc_dointvec,
4719 },
4720 {
4721 .procname = "accept_ra",
4722 .data = &ipv6_devconf.accept_ra,
4723 .maxlen = sizeof(int),
4724 .mode = 0644,
4725 .proc_handler = proc_dointvec,
4726 },
4727 {
4728 .procname = "accept_redirects",
4729 .data = &ipv6_devconf.accept_redirects,
4730 .maxlen = sizeof(int),
4731 .mode = 0644,
4732 .proc_handler = proc_dointvec,
4733 },
4734 {
4735 .procname = "autoconf",
4736 .data = &ipv6_devconf.autoconf,
4737 .maxlen = sizeof(int),
4738 .mode = 0644,
4739 .proc_handler = proc_dointvec,
4740 },
4741 {
4742 .procname = "dad_transmits",
4743 .data = &ipv6_devconf.dad_transmits,
4744 .maxlen = sizeof(int),
4745 .mode = 0644,
4746 .proc_handler = proc_dointvec,
4747 },
4748 {
4749 .procname = "router_solicitations",
4750 .data = &ipv6_devconf.rtr_solicits,
4751 .maxlen = sizeof(int),
4752 .mode = 0644,
4753 .proc_handler = proc_dointvec,
4754 },
4755 {
4756 .procname = "router_solicitation_interval",
4757 .data = &ipv6_devconf.rtr_solicit_interval,
4758 .maxlen = sizeof(int),
4759 .mode = 0644,
4760 .proc_handler = proc_dointvec_jiffies,
4761 },
4762 {
4763 .procname = "router_solicitation_delay",
4764 .data = &ipv6_devconf.rtr_solicit_delay,
4765 .maxlen = sizeof(int),
4766 .mode = 0644,
4767 .proc_handler = proc_dointvec_jiffies,
4768 },
4769 {
4770 .procname = "force_mld_version",
4771 .data = &ipv6_devconf.force_mld_version,
4772 .maxlen = sizeof(int),
4773 .mode = 0644,
4774 .proc_handler = proc_dointvec,
4775 },
4776 {
4777 .procname = "mldv1_unsolicited_report_interval",
4778 .data =
4779 &ipv6_devconf.mldv1_unsolicited_report_interval,
4780 .maxlen = sizeof(int),
4781 .mode = 0644,
4782 .proc_handler = proc_dointvec_ms_jiffies,
4783 },
4784 {
4785 .procname = "mldv2_unsolicited_report_interval",
4786 .data =
4787 &ipv6_devconf.mldv2_unsolicited_report_interval,
4788 .maxlen = sizeof(int),
4789 .mode = 0644,
4790 .proc_handler = proc_dointvec_ms_jiffies,
4791 },
4792 {
4793 .procname = "use_tempaddr",
4794 .data = &ipv6_devconf.use_tempaddr,
4795 .maxlen = sizeof(int),
4796 .mode = 0644,
4797 .proc_handler = proc_dointvec,
4798 },
4799 {
4800 .procname = "temp_valid_lft",
4801 .data = &ipv6_devconf.temp_valid_lft,
4802 .maxlen = sizeof(int),
4803 .mode = 0644,
4804 .proc_handler = proc_dointvec,
4805 },
4806 {
4807 .procname = "temp_prefered_lft",
4808 .data = &ipv6_devconf.temp_prefered_lft,
4809 .maxlen = sizeof(int),
4810 .mode = 0644,
4811 .proc_handler = proc_dointvec,
4812 },
4813 {
4814 .procname = "regen_max_retry",
4815 .data = &ipv6_devconf.regen_max_retry,
4816 .maxlen = sizeof(int),
4817 .mode = 0644,
4818 .proc_handler = proc_dointvec,
4819 },
4820 {
4821 .procname = "max_desync_factor",
4822 .data = &ipv6_devconf.max_desync_factor,
4823 .maxlen = sizeof(int),
4824 .mode = 0644,
4825 .proc_handler = proc_dointvec,
4826 },
4827 {
4828 .procname = "max_addresses",
4829 .data = &ipv6_devconf.max_addresses,
4830 .maxlen = sizeof(int),
4831 .mode = 0644,
4832 .proc_handler = proc_dointvec,
4833 },
4834 {
4835 .procname = "accept_ra_defrtr",
4836 .data = &ipv6_devconf.accept_ra_defrtr,
4837 .maxlen = sizeof(int),
4838 .mode = 0644,
4839 .proc_handler = proc_dointvec,
4840 },
4841 {
4842 .procname = "accept_ra_pinfo",
4843 .data = &ipv6_devconf.accept_ra_pinfo,
4844 .maxlen = sizeof(int),
4845 .mode = 0644,
4846 .proc_handler = proc_dointvec,
4847 },
4848 #ifdef CONFIG_IPV6_ROUTER_PREF
4849 {
4850 .procname = "accept_ra_rtr_pref",
4851 .data = &ipv6_devconf.accept_ra_rtr_pref,
4852 .maxlen = sizeof(int),
4853 .mode = 0644,
4854 .proc_handler = proc_dointvec,
4855 },
4856 {
4857 .procname = "router_probe_interval",
4858 .data = &ipv6_devconf.rtr_probe_interval,
4859 .maxlen = sizeof(int),
4860 .mode = 0644,
4861 .proc_handler = proc_dointvec_jiffies,
4862 },
4863 #ifdef CONFIG_IPV6_ROUTE_INFO
4864 {
4865 .procname = "accept_ra_rt_info_max_plen",
4866 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4867 .maxlen = sizeof(int),
4868 .mode = 0644,
4869 .proc_handler = proc_dointvec,
4870 },
4871 #endif
4872 #endif
4873 {
4874 .procname = "proxy_ndp",
4875 .data = &ipv6_devconf.proxy_ndp,
4876 .maxlen = sizeof(int),
4877 .mode = 0644,
4878 .proc_handler = proc_dointvec,
4879 },
4880 {
4881 .procname = "accept_source_route",
4882 .data = &ipv6_devconf.accept_source_route,
4883 .maxlen = sizeof(int),
4884 .mode = 0644,
4885 .proc_handler = proc_dointvec,
4886 },
4887 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4888 {
4889 .procname = "optimistic_dad",
4890 .data = &ipv6_devconf.optimistic_dad,
4891 .maxlen = sizeof(int),
4892 .mode = 0644,
4893 .proc_handler = proc_dointvec,
4894
4895 },
4896 #endif
4897 #ifdef CONFIG_IPV6_MROUTE
4898 {
4899 .procname = "mc_forwarding",
4900 .data = &ipv6_devconf.mc_forwarding,
4901 .maxlen = sizeof(int),
4902 .mode = 0444,
4903 .proc_handler = proc_dointvec,
4904 },
4905 #endif
4906 {
4907 .procname = "disable_ipv6",
4908 .data = &ipv6_devconf.disable_ipv6,
4909 .maxlen = sizeof(int),
4910 .mode = 0644,
4911 .proc_handler = addrconf_sysctl_disable,
4912 },
4913 {
4914 .procname = "accept_dad",
4915 .data = &ipv6_devconf.accept_dad,
4916 .maxlen = sizeof(int),
4917 .mode = 0644,
4918 .proc_handler = proc_dointvec,
4919 },
4920 {
4921 .procname = "force_tllao",
4922 .data = &ipv6_devconf.force_tllao,
4923 .maxlen = sizeof(int),
4924 .mode = 0644,
4925 .proc_handler = proc_dointvec
4926 },
4927 {
4928 .procname = "ndisc_notify",
4929 .data = &ipv6_devconf.ndisc_notify,
4930 .maxlen = sizeof(int),
4931 .mode = 0644,
4932 .proc_handler = proc_dointvec
4933 },
4934 {
4935 .procname = "suppress_frag_ndisc",
4936 .data = &ipv6_devconf.suppress_frag_ndisc,
4937 .maxlen = sizeof(int),
4938 .mode = 0644,
4939 .proc_handler = proc_dointvec
4940 },
4941 {
4942 /* sentinel */
4943 }
4944 },
4945 };
4946
4947 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4948 struct inet6_dev *idev, struct ipv6_devconf *p)
4949 {
4950 int i;
4951 struct addrconf_sysctl_table *t;
4952 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4953
4954 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4955 if (t == NULL)
4956 goto out;
4957
4958 for (i = 0; t->addrconf_vars[i].data; i++) {
4959 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4960 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4961 t->addrconf_vars[i].extra2 = net;
4962 }
4963
4964 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4965
4966 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4967 if (t->sysctl_header == NULL)
4968 goto free;
4969
4970 p->sysctl = t;
4971 return 0;
4972
4973 free:
4974 kfree(t);
4975 out:
4976 return -ENOBUFS;
4977 }
4978
4979 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4980 {
4981 struct addrconf_sysctl_table *t;
4982
4983 if (p->sysctl == NULL)
4984 return;
4985
4986 t = p->sysctl;
4987 p->sysctl = NULL;
4988 unregister_net_sysctl_table(t->sysctl_header);
4989 kfree(t);
4990 }
4991
4992 static void addrconf_sysctl_register(struct inet6_dev *idev)
4993 {
4994 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4995 &ndisc_ifinfo_sysctl_change);
4996 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4997 idev, &idev->cnf);
4998 }
4999
5000 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5001 {
5002 __addrconf_sysctl_unregister(&idev->cnf);
5003 neigh_sysctl_unregister(idev->nd_parms);
5004 }
5005
5006
5007 #endif
5008
5009 static int __net_init addrconf_init_net(struct net *net)
5010 {
5011 int err = -ENOMEM;
5012 struct ipv6_devconf *all, *dflt;
5013
5014 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5015 if (all == NULL)
5016 goto err_alloc_all;
5017
5018 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5019 if (dflt == NULL)
5020 goto err_alloc_dflt;
5021
5022 /* these will be inherited by all namespaces */
5023 dflt->autoconf = ipv6_defaults.autoconf;
5024 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5025
5026 net->ipv6.devconf_all = all;
5027 net->ipv6.devconf_dflt = dflt;
5028
5029 #ifdef CONFIG_SYSCTL
5030 err = __addrconf_sysctl_register(net, "all", NULL, all);
5031 if (err < 0)
5032 goto err_reg_all;
5033
5034 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5035 if (err < 0)
5036 goto err_reg_dflt;
5037 #endif
5038 return 0;
5039
5040 #ifdef CONFIG_SYSCTL
5041 err_reg_dflt:
5042 __addrconf_sysctl_unregister(all);
5043 err_reg_all:
5044 kfree(dflt);
5045 #endif
5046 err_alloc_dflt:
5047 kfree(all);
5048 err_alloc_all:
5049 return err;
5050 }
5051
5052 static void __net_exit addrconf_exit_net(struct net *net)
5053 {
5054 #ifdef CONFIG_SYSCTL
5055 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5056 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5057 #endif
5058 if (!net_eq(net, &init_net)) {
5059 kfree(net->ipv6.devconf_dflt);
5060 kfree(net->ipv6.devconf_all);
5061 }
5062 }
5063
5064 static struct pernet_operations addrconf_ops = {
5065 .init = addrconf_init_net,
5066 .exit = addrconf_exit_net,
5067 };
5068
5069 static struct rtnl_af_ops inet6_ops = {
5070 .family = AF_INET6,
5071 .fill_link_af = inet6_fill_link_af,
5072 .get_link_af_size = inet6_get_link_af_size,
5073 .set_link_af = inet6_set_link_af,
5074 };
5075
5076 /*
5077 * Init / cleanup code
5078 */
5079
5080 int __init addrconf_init(void)
5081 {
5082 int i, err;
5083
5084 err = ipv6_addr_label_init();
5085 if (err < 0) {
5086 pr_crit("%s: cannot initialize default policy table: %d\n",
5087 __func__, err);
5088 goto out;
5089 }
5090
5091 err = register_pernet_subsys(&addrconf_ops);
5092 if (err < 0)
5093 goto out_addrlabel;
5094
5095 /* The addrconf netdev notifier requires that loopback_dev
5096 * has it's ipv6 private information allocated and setup
5097 * before it can bring up and give link-local addresses
5098 * to other devices which are up.
5099 *
5100 * Unfortunately, loopback_dev is not necessarily the first
5101 * entry in the global dev_base list of net devices. In fact,
5102 * it is likely to be the very last entry on that list.
5103 * So this causes the notifier registry below to try and
5104 * give link-local addresses to all devices besides loopback_dev
5105 * first, then loopback_dev, which cases all the non-loopback_dev
5106 * devices to fail to get a link-local address.
5107 *
5108 * So, as a temporary fix, allocate the ipv6 structure for
5109 * loopback_dev first by hand.
5110 * Longer term, all of the dependencies ipv6 has upon the loopback
5111 * device and it being up should be removed.
5112 */
5113 rtnl_lock();
5114 if (!ipv6_add_dev(init_net.loopback_dev))
5115 err = -ENOMEM;
5116 rtnl_unlock();
5117 if (err)
5118 goto errlo;
5119
5120 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5121 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5122
5123 register_netdevice_notifier(&ipv6_dev_notf);
5124
5125 addrconf_verify(0);
5126
5127 err = rtnl_af_register(&inet6_ops);
5128 if (err < 0)
5129 goto errout_af;
5130
5131 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5132 NULL);
5133 if (err < 0)
5134 goto errout;
5135
5136 /* Only the first call to __rtnl_register can fail */
5137 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5138 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5139 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5140 inet6_dump_ifaddr, NULL);
5141 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5142 inet6_dump_ifmcaddr, NULL);
5143 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5144 inet6_dump_ifacaddr, NULL);
5145 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5146 inet6_netconf_dump_devconf, NULL);
5147
5148 ipv6_addr_label_rtnl_register();
5149
5150 return 0;
5151 errout:
5152 rtnl_af_unregister(&inet6_ops);
5153 errout_af:
5154 unregister_netdevice_notifier(&ipv6_dev_notf);
5155 errlo:
5156 unregister_pernet_subsys(&addrconf_ops);
5157 out_addrlabel:
5158 ipv6_addr_label_cleanup();
5159 out:
5160 return err;
5161 }
5162
5163 void addrconf_cleanup(void)
5164 {
5165 struct net_device *dev;
5166 int i;
5167
5168 unregister_netdevice_notifier(&ipv6_dev_notf);
5169 unregister_pernet_subsys(&addrconf_ops);
5170 ipv6_addr_label_cleanup();
5171
5172 rtnl_lock();
5173
5174 __rtnl_af_unregister(&inet6_ops);
5175
5176 /* clean dev list */
5177 for_each_netdev(&init_net, dev) {
5178 if (__in6_dev_get(dev) == NULL)
5179 continue;
5180 addrconf_ifdown(dev, 1);
5181 }
5182 addrconf_ifdown(init_net.loopback_dev, 2);
5183
5184 /*
5185 * Check hash table.
5186 */
5187 spin_lock_bh(&addrconf_hash_lock);
5188 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5189 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5190 spin_unlock_bh(&addrconf_hash_lock);
5191
5192 del_timer(&addr_chk_timer);
5193 rtnl_unlock();
5194 }
Linux kernel - Deliverables
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