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ipv6: simplify detection of first operational link-local address on interface
[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,
2513 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2514 if (!IS_ERR(ifp)) {
2515 spin_lock_bh(&ifp->lock);
2516 ifp->flags &= ~IFA_F_TENTATIVE;
2517 spin_unlock_bh(&ifp->lock);
2518 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2519 in6_ifa_put(ifp);
2520 }
2521 }
2522
2523 #if IS_ENABLED(CONFIG_IPV6_SIT)
2524 static void sit_add_v4_addrs(struct inet6_dev *idev)
2525 {
2526 struct in6_addr addr;
2527 struct net_device *dev;
2528 struct net *net = dev_net(idev->dev);
2529 int scope, plen;
2530 u32 pflags = 0;
2531
2532 ASSERT_RTNL();
2533
2534 memset(&addr, 0, sizeof(struct in6_addr));
2535 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2536
2537 if (idev->dev->flags&IFF_POINTOPOINT) {
2538 addr.s6_addr32[0] = htonl(0xfe800000);
2539 scope = IFA_LINK;
2540 plen = 64;
2541 } else {
2542 scope = IPV6_ADDR_COMPATv4;
2543 plen = 96;
2544 pflags |= RTF_NONEXTHOP;
2545 }
2546
2547 if (addr.s6_addr32[3]) {
2548 add_addr(idev, &addr, plen, scope);
2549 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2550 return;
2551 }
2552
2553 for_each_netdev(net, dev) {
2554 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2555 if (in_dev && (dev->flags & IFF_UP)) {
2556 struct in_ifaddr *ifa;
2557
2558 int flag = scope;
2559
2560 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2561
2562 addr.s6_addr32[3] = ifa->ifa_local;
2563
2564 if (ifa->ifa_scope == RT_SCOPE_LINK)
2565 continue;
2566 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2567 if (idev->dev->flags&IFF_POINTOPOINT)
2568 continue;
2569 flag |= IFA_HOST;
2570 }
2571
2572 add_addr(idev, &addr, plen, flag);
2573 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2574 pflags);
2575 }
2576 }
2577 }
2578 }
2579 #endif
2580
2581 static void init_loopback(struct net_device *dev)
2582 {
2583 struct inet6_dev *idev;
2584 struct net_device *sp_dev;
2585 struct inet6_ifaddr *sp_ifa;
2586 struct rt6_info *sp_rt;
2587
2588 /* ::1 */
2589
2590 ASSERT_RTNL();
2591
2592 if ((idev = ipv6_find_idev(dev)) == NULL) {
2593 pr_debug("%s: add_dev failed\n", __func__);
2594 return;
2595 }
2596
2597 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2598
2599 /* Add routes to other interface's IPv6 addresses */
2600 for_each_netdev(dev_net(dev), sp_dev) {
2601 if (!strcmp(sp_dev->name, dev->name))
2602 continue;
2603
2604 idev = __in6_dev_get(sp_dev);
2605 if (!idev)
2606 continue;
2607
2608 read_lock_bh(&idev->lock);
2609 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2610
2611 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2612 continue;
2613
2614 if (sp_ifa->rt)
2615 continue;
2616
2617 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2618
2619 /* Failure cases are ignored */
2620 if (!IS_ERR(sp_rt)) {
2621 sp_ifa->rt = sp_rt;
2622 ip6_ins_rt(sp_rt);
2623 }
2624 }
2625 read_unlock_bh(&idev->lock);
2626 }
2627 }
2628
2629 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2630 {
2631 struct inet6_ifaddr *ifp;
2632 u32 addr_flags = IFA_F_PERMANENT;
2633
2634 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2635 if (idev->cnf.optimistic_dad &&
2636 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2637 addr_flags |= IFA_F_OPTIMISTIC;
2638 #endif
2639
2640
2641 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2642 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2643 if (!IS_ERR(ifp)) {
2644 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2645 addrconf_dad_start(ifp);
2646 in6_ifa_put(ifp);
2647 }
2648 }
2649
2650 static void addrconf_dev_config(struct net_device *dev)
2651 {
2652 struct in6_addr addr;
2653 struct inet6_dev *idev;
2654
2655 ASSERT_RTNL();
2656
2657 if ((dev->type != ARPHRD_ETHER) &&
2658 (dev->type != ARPHRD_FDDI) &&
2659 (dev->type != ARPHRD_ARCNET) &&
2660 (dev->type != ARPHRD_INFINIBAND) &&
2661 (dev->type != ARPHRD_IEEE802154) &&
2662 (dev->type != ARPHRD_IEEE1394) &&
2663 (dev->type != ARPHRD_TUNNEL6)) {
2664 /* Alas, we support only Ethernet autoconfiguration. */
2665 return;
2666 }
2667
2668 idev = addrconf_add_dev(dev);
2669 if (IS_ERR(idev))
2670 return;
2671
2672 memset(&addr, 0, sizeof(struct in6_addr));
2673 addr.s6_addr32[0] = htonl(0xFE800000);
2674
2675 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2676 addrconf_add_linklocal(idev, &addr);
2677 }
2678
2679 #if IS_ENABLED(CONFIG_IPV6_SIT)
2680 static void addrconf_sit_config(struct net_device *dev)
2681 {
2682 struct inet6_dev *idev;
2683
2684 ASSERT_RTNL();
2685
2686 /*
2687 * Configure the tunnel with one of our IPv4
2688 * addresses... we should configure all of
2689 * our v4 addrs in the tunnel
2690 */
2691
2692 if ((idev = ipv6_find_idev(dev)) == NULL) {
2693 pr_debug("%s: add_dev failed\n", __func__);
2694 return;
2695 }
2696
2697 if (dev->priv_flags & IFF_ISATAP) {
2698 struct in6_addr addr;
2699
2700 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2701 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2702 addrconf_add_linklocal(idev, &addr);
2703 return;
2704 }
2705
2706 sit_add_v4_addrs(idev);
2707
2708 if (dev->flags&IFF_POINTOPOINT)
2709 addrconf_add_mroute(dev);
2710 }
2711 #endif
2712
2713 #if IS_ENABLED(CONFIG_NET_IPGRE)
2714 static void addrconf_gre_config(struct net_device *dev)
2715 {
2716 struct inet6_dev *idev;
2717 struct in6_addr addr;
2718
2719 ASSERT_RTNL();
2720
2721 if ((idev = ipv6_find_idev(dev)) == NULL) {
2722 pr_debug("%s: add_dev failed\n", __func__);
2723 return;
2724 }
2725
2726 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2727 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2728 addrconf_add_linklocal(idev, &addr);
2729 }
2730 #endif
2731
2732 static inline int
2733 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2734 {
2735 struct in6_addr lladdr;
2736
2737 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2738 addrconf_add_linklocal(idev, &lladdr);
2739 return 0;
2740 }
2741 return -1;
2742 }
2743
2744 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2745 void *ptr)
2746 {
2747 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2748 struct inet6_dev *idev = __in6_dev_get(dev);
2749 int run_pending = 0;
2750 int err;
2751
2752 switch (event) {
2753 case NETDEV_REGISTER:
2754 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2755 idev = ipv6_add_dev(dev);
2756 if (!idev)
2757 return notifier_from_errno(-ENOMEM);
2758 }
2759 break;
2760
2761 case NETDEV_UP:
2762 case NETDEV_CHANGE:
2763 if (dev->flags & IFF_SLAVE)
2764 break;
2765
2766 if (event == NETDEV_UP) {
2767 if (!addrconf_qdisc_ok(dev)) {
2768 /* device is not ready yet. */
2769 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2770 dev->name);
2771 break;
2772 }
2773
2774 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2775 idev = ipv6_add_dev(dev);
2776
2777 if (idev) {
2778 idev->if_flags |= IF_READY;
2779 run_pending = 1;
2780 }
2781 } else {
2782 if (!addrconf_qdisc_ok(dev)) {
2783 /* device is still not ready. */
2784 break;
2785 }
2786
2787 if (idev) {
2788 if (idev->if_flags & IF_READY)
2789 /* device is already configured. */
2790 break;
2791 idev->if_flags |= IF_READY;
2792 }
2793
2794 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2795 dev->name);
2796
2797 run_pending = 1;
2798 }
2799
2800 switch (dev->type) {
2801 #if IS_ENABLED(CONFIG_IPV6_SIT)
2802 case ARPHRD_SIT:
2803 addrconf_sit_config(dev);
2804 break;
2805 #endif
2806 #if IS_ENABLED(CONFIG_NET_IPGRE)
2807 case ARPHRD_IPGRE:
2808 addrconf_gre_config(dev);
2809 break;
2810 #endif
2811 case ARPHRD_LOOPBACK:
2812 init_loopback(dev);
2813 break;
2814
2815 default:
2816 addrconf_dev_config(dev);
2817 break;
2818 }
2819
2820 if (idev) {
2821 if (run_pending)
2822 addrconf_dad_run(idev);
2823
2824 /*
2825 * If the MTU changed during the interface down,
2826 * when the interface up, the changed MTU must be
2827 * reflected in the idev as well as routers.
2828 */
2829 if (idev->cnf.mtu6 != dev->mtu &&
2830 dev->mtu >= IPV6_MIN_MTU) {
2831 rt6_mtu_change(dev, dev->mtu);
2832 idev->cnf.mtu6 = dev->mtu;
2833 }
2834 idev->tstamp = jiffies;
2835 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2836
2837 /*
2838 * If the changed mtu during down is lower than
2839 * IPV6_MIN_MTU stop IPv6 on this interface.
2840 */
2841 if (dev->mtu < IPV6_MIN_MTU)
2842 addrconf_ifdown(dev, 1);
2843 }
2844 break;
2845
2846 case NETDEV_CHANGEMTU:
2847 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2848 rt6_mtu_change(dev, dev->mtu);
2849 idev->cnf.mtu6 = dev->mtu;
2850 break;
2851 }
2852
2853 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2854 idev = ipv6_add_dev(dev);
2855 if (idev)
2856 break;
2857 }
2858
2859 /*
2860 * MTU falled under IPV6_MIN_MTU.
2861 * Stop IPv6 on this interface.
2862 */
2863
2864 case NETDEV_DOWN:
2865 case NETDEV_UNREGISTER:
2866 /*
2867 * Remove all addresses from this interface.
2868 */
2869 addrconf_ifdown(dev, event != NETDEV_DOWN);
2870 break;
2871
2872 case NETDEV_CHANGENAME:
2873 if (idev) {
2874 snmp6_unregister_dev(idev);
2875 addrconf_sysctl_unregister(idev);
2876 addrconf_sysctl_register(idev);
2877 err = snmp6_register_dev(idev);
2878 if (err)
2879 return notifier_from_errno(err);
2880 }
2881 break;
2882
2883 case NETDEV_PRE_TYPE_CHANGE:
2884 case NETDEV_POST_TYPE_CHANGE:
2885 addrconf_type_change(dev, event);
2886 break;
2887 }
2888
2889 return NOTIFY_OK;
2890 }
2891
2892 /*
2893 * addrconf module should be notified of a device going up
2894 */
2895 static struct notifier_block ipv6_dev_notf = {
2896 .notifier_call = addrconf_notify,
2897 };
2898
2899 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2900 {
2901 struct inet6_dev *idev;
2902 ASSERT_RTNL();
2903
2904 idev = __in6_dev_get(dev);
2905
2906 if (event == NETDEV_POST_TYPE_CHANGE)
2907 ipv6_mc_remap(idev);
2908 else if (event == NETDEV_PRE_TYPE_CHANGE)
2909 ipv6_mc_unmap(idev);
2910 }
2911
2912 static int addrconf_ifdown(struct net_device *dev, int how)
2913 {
2914 struct net *net = dev_net(dev);
2915 struct inet6_dev *idev;
2916 struct inet6_ifaddr *ifa;
2917 int state, i;
2918
2919 ASSERT_RTNL();
2920
2921 rt6_ifdown(net, dev);
2922 neigh_ifdown(&nd_tbl, dev);
2923
2924 idev = __in6_dev_get(dev);
2925 if (idev == NULL)
2926 return -ENODEV;
2927
2928 /*
2929 * Step 1: remove reference to ipv6 device from parent device.
2930 * Do not dev_put!
2931 */
2932 if (how) {
2933 idev->dead = 1;
2934
2935 /* protected by rtnl_lock */
2936 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2937
2938 /* Step 1.5: remove snmp6 entry */
2939 snmp6_unregister_dev(idev);
2940
2941 }
2942
2943 /* Step 2: clear hash table */
2944 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2945 struct hlist_head *h = &inet6_addr_lst[i];
2946
2947 spin_lock_bh(&addrconf_hash_lock);
2948 restart:
2949 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
2950 if (ifa->idev == idev) {
2951 hlist_del_init_rcu(&ifa->addr_lst);
2952 addrconf_del_dad_timer(ifa);
2953 goto restart;
2954 }
2955 }
2956 spin_unlock_bh(&addrconf_hash_lock);
2957 }
2958
2959 write_lock_bh(&idev->lock);
2960
2961 addrconf_del_rs_timer(idev);
2962
2963 /* Step 2: clear flags for stateless addrconf */
2964 if (!how)
2965 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2966
2967 if (how && del_timer(&idev->regen_timer))
2968 in6_dev_put(idev);
2969
2970 /* Step 3: clear tempaddr list */
2971 while (!list_empty(&idev->tempaddr_list)) {
2972 ifa = list_first_entry(&idev->tempaddr_list,
2973 struct inet6_ifaddr, tmp_list);
2974 list_del(&ifa->tmp_list);
2975 write_unlock_bh(&idev->lock);
2976 spin_lock_bh(&ifa->lock);
2977
2978 if (ifa->ifpub) {
2979 in6_ifa_put(ifa->ifpub);
2980 ifa->ifpub = NULL;
2981 }
2982 spin_unlock_bh(&ifa->lock);
2983 in6_ifa_put(ifa);
2984 write_lock_bh(&idev->lock);
2985 }
2986
2987 while (!list_empty(&idev->addr_list)) {
2988 ifa = list_first_entry(&idev->addr_list,
2989 struct inet6_ifaddr, if_list);
2990 addrconf_del_dad_timer(ifa);
2991
2992 list_del(&ifa->if_list);
2993
2994 write_unlock_bh(&idev->lock);
2995
2996 spin_lock_bh(&ifa->state_lock);
2997 state = ifa->state;
2998 ifa->state = INET6_IFADDR_STATE_DEAD;
2999 spin_unlock_bh(&ifa->state_lock);
3000
3001 if (state != INET6_IFADDR_STATE_DEAD) {
3002 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3003 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3004 }
3005 in6_ifa_put(ifa);
3006
3007 write_lock_bh(&idev->lock);
3008 }
3009
3010 write_unlock_bh(&idev->lock);
3011
3012 /* Step 5: Discard multicast list */
3013 if (how)
3014 ipv6_mc_destroy_dev(idev);
3015 else
3016 ipv6_mc_down(idev);
3017
3018 idev->tstamp = jiffies;
3019
3020 /* Last: Shot the device (if unregistered) */
3021 if (how) {
3022 addrconf_sysctl_unregister(idev);
3023 neigh_parms_release(&nd_tbl, idev->nd_parms);
3024 neigh_ifdown(&nd_tbl, dev);
3025 in6_dev_put(idev);
3026 }
3027 return 0;
3028 }
3029
3030 static void addrconf_rs_timer(unsigned long data)
3031 {
3032 struct inet6_dev *idev = (struct inet6_dev *)data;
3033 struct net_device *dev = idev->dev;
3034 struct in6_addr lladdr;
3035
3036 write_lock(&idev->lock);
3037 if (idev->dead || !(idev->if_flags & IF_READY))
3038 goto out;
3039
3040 if (!ipv6_accept_ra(idev))
3041 goto out;
3042
3043 /* Announcement received after solicitation was sent */
3044 if (idev->if_flags & IF_RA_RCVD)
3045 goto out;
3046
3047 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3048 write_unlock(&idev->lock);
3049 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3050 ndisc_send_rs(dev, &lladdr,
3051 &in6addr_linklocal_allrouters);
3052 else
3053 goto put;
3054
3055 write_lock(&idev->lock);
3056 /* The wait after the last probe can be shorter */
3057 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3058 idev->cnf.rtr_solicits) ?
3059 idev->cnf.rtr_solicit_delay :
3060 idev->cnf.rtr_solicit_interval);
3061 } else {
3062 /*
3063 * Note: we do not support deprecated "all on-link"
3064 * assumption any longer.
3065 */
3066 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3067 }
3068
3069 out:
3070 write_unlock(&idev->lock);
3071 put:
3072 in6_dev_put(idev);
3073 }
3074
3075 /*
3076 * Duplicate Address Detection
3077 */
3078 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3079 {
3080 unsigned long rand_num;
3081 struct inet6_dev *idev = ifp->idev;
3082
3083 if (ifp->flags & IFA_F_OPTIMISTIC)
3084 rand_num = 0;
3085 else
3086 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3087
3088 ifp->dad_probes = idev->cnf.dad_transmits;
3089 addrconf_mod_dad_timer(ifp, rand_num);
3090 }
3091
3092 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3093 {
3094 struct inet6_dev *idev = ifp->idev;
3095 struct net_device *dev = idev->dev;
3096
3097 addrconf_join_solict(dev, &ifp->addr);
3098
3099 net_srandom(ifp->addr.s6_addr32[3]);
3100
3101 read_lock_bh(&idev->lock);
3102 spin_lock(&ifp->lock);
3103 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3104 goto out;
3105
3106 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3107 idev->cnf.accept_dad < 1 ||
3108 !(ifp->flags&IFA_F_TENTATIVE) ||
3109 ifp->flags & IFA_F_NODAD) {
3110 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3111 spin_unlock(&ifp->lock);
3112 read_unlock_bh(&idev->lock);
3113
3114 addrconf_dad_completed(ifp);
3115 return;
3116 }
3117
3118 if (!(idev->if_flags & IF_READY)) {
3119 spin_unlock(&ifp->lock);
3120 read_unlock_bh(&idev->lock);
3121 /*
3122 * If the device is not ready:
3123 * - keep it tentative if it is a permanent address.
3124 * - otherwise, kill it.
3125 */
3126 in6_ifa_hold(ifp);
3127 addrconf_dad_stop(ifp, 0);
3128 return;
3129 }
3130
3131 /*
3132 * Optimistic nodes can start receiving
3133 * Frames right away
3134 */
3135 if (ifp->flags & IFA_F_OPTIMISTIC)
3136 ip6_ins_rt(ifp->rt);
3137
3138 addrconf_dad_kick(ifp);
3139 out:
3140 spin_unlock(&ifp->lock);
3141 read_unlock_bh(&idev->lock);
3142 }
3143
3144 static void addrconf_dad_timer(unsigned long data)
3145 {
3146 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3147 struct inet6_dev *idev = ifp->idev;
3148 struct in6_addr mcaddr;
3149
3150 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3151 goto out;
3152
3153 write_lock(&idev->lock);
3154 if (idev->dead || !(idev->if_flags & IF_READY)) {
3155 write_unlock(&idev->lock);
3156 goto out;
3157 }
3158
3159 spin_lock(&ifp->lock);
3160 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3161 spin_unlock(&ifp->lock);
3162 write_unlock(&idev->lock);
3163 goto out;
3164 }
3165
3166 if (ifp->dad_probes == 0) {
3167 /*
3168 * DAD was successful
3169 */
3170
3171 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3172 spin_unlock(&ifp->lock);
3173 write_unlock(&idev->lock);
3174
3175 addrconf_dad_completed(ifp);
3176
3177 goto out;
3178 }
3179
3180 ifp->dad_probes--;
3181 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
3182 spin_unlock(&ifp->lock);
3183 write_unlock(&idev->lock);
3184
3185 /* send a neighbour solicitation for our addr */
3186 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3187 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3188 out:
3189 in6_ifa_put(ifp);
3190 }
3191
3192 /* ifp->idev must be at least read locked */
3193 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3194 {
3195 struct inet6_ifaddr *ifpiter;
3196 struct inet6_dev *idev = ifp->idev;
3197
3198 list_for_each_entry(ifpiter, &idev->addr_list, if_list) {
3199 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3200 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3201 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3202 IFA_F_PERMANENT)
3203 return false;
3204 }
3205 return true;
3206 }
3207
3208 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3209 {
3210 struct net_device *dev = ifp->idev->dev;
3211 struct in6_addr lladdr;
3212 bool send_rs, send_mld;
3213
3214 addrconf_del_dad_timer(ifp);
3215
3216 /*
3217 * Configure the address for reception. Now it is valid.
3218 */
3219
3220 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3221
3222 /* If added prefix is link local and we are prepared to process
3223 router advertisements, start sending router solicitations.
3224 */
3225
3226 read_lock_bh(&ifp->idev->lock);
3227 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3228 send_rs = send_mld &&
3229 ipv6_accept_ra(ifp->idev) &&
3230 ifp->idev->cnf.rtr_solicits > 0 &&
3231 (dev->flags&IFF_LOOPBACK) == 0;
3232 read_unlock_bh(&ifp->idev->lock);
3233
3234 /* While dad is in progress mld report's source address is in6_addrany.
3235 * Resend with proper ll now.
3236 */
3237 if (send_mld)
3238 ipv6_mc_dad_complete(ifp->idev);
3239
3240 if (send_rs) {
3241 /*
3242 * If a host as already performed a random delay
3243 * [...] as part of DAD [...] there is no need
3244 * to delay again before sending the first RS
3245 */
3246 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3247 return;
3248 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3249
3250 write_lock_bh(&ifp->idev->lock);
3251 spin_lock(&ifp->lock);
3252 ifp->idev->rs_probes = 1;
3253 ifp->idev->if_flags |= IF_RS_SENT;
3254 addrconf_mod_rs_timer(ifp->idev,
3255 ifp->idev->cnf.rtr_solicit_interval);
3256 spin_unlock(&ifp->lock);
3257 write_unlock_bh(&ifp->idev->lock);
3258 }
3259 }
3260
3261 static void addrconf_dad_run(struct inet6_dev *idev)
3262 {
3263 struct inet6_ifaddr *ifp;
3264
3265 read_lock_bh(&idev->lock);
3266 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3267 spin_lock(&ifp->lock);
3268 if (ifp->flags & IFA_F_TENTATIVE &&
3269 ifp->state == INET6_IFADDR_STATE_DAD)
3270 addrconf_dad_kick(ifp);
3271 spin_unlock(&ifp->lock);
3272 }
3273 read_unlock_bh(&idev->lock);
3274 }
3275
3276 #ifdef CONFIG_PROC_FS
3277 struct if6_iter_state {
3278 struct seq_net_private p;
3279 int bucket;
3280 int offset;
3281 };
3282
3283 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3284 {
3285 struct inet6_ifaddr *ifa = NULL;
3286 struct if6_iter_state *state = seq->private;
3287 struct net *net = seq_file_net(seq);
3288 int p = 0;
3289
3290 /* initial bucket if pos is 0 */
3291 if (pos == 0) {
3292 state->bucket = 0;
3293 state->offset = 0;
3294 }
3295
3296 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3297 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3298 addr_lst) {
3299 if (!net_eq(dev_net(ifa->idev->dev), net))
3300 continue;
3301 /* sync with offset */
3302 if (p < state->offset) {
3303 p++;
3304 continue;
3305 }
3306 state->offset++;
3307 return ifa;
3308 }
3309
3310 /* prepare for next bucket */
3311 state->offset = 0;
3312 p = 0;
3313 }
3314 return NULL;
3315 }
3316
3317 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3318 struct inet6_ifaddr *ifa)
3319 {
3320 struct if6_iter_state *state = seq->private;
3321 struct net *net = seq_file_net(seq);
3322
3323 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3324 if (!net_eq(dev_net(ifa->idev->dev), net))
3325 continue;
3326 state->offset++;
3327 return ifa;
3328 }
3329
3330 while (++state->bucket < IN6_ADDR_HSIZE) {
3331 state->offset = 0;
3332 hlist_for_each_entry_rcu_bh(ifa,
3333 &inet6_addr_lst[state->bucket], addr_lst) {
3334 if (!net_eq(dev_net(ifa->idev->dev), net))
3335 continue;
3336 state->offset++;
3337 return ifa;
3338 }
3339 }
3340
3341 return NULL;
3342 }
3343
3344 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3345 __acquires(rcu_bh)
3346 {
3347 rcu_read_lock_bh();
3348 return if6_get_first(seq, *pos);
3349 }
3350
3351 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3352 {
3353 struct inet6_ifaddr *ifa;
3354
3355 ifa = if6_get_next(seq, v);
3356 ++*pos;
3357 return ifa;
3358 }
3359
3360 static void if6_seq_stop(struct seq_file *seq, void *v)
3361 __releases(rcu_bh)
3362 {
3363 rcu_read_unlock_bh();
3364 }
3365
3366 static int if6_seq_show(struct seq_file *seq, void *v)
3367 {
3368 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3369 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3370 &ifp->addr,
3371 ifp->idev->dev->ifindex,
3372 ifp->prefix_len,
3373 ifp->scope,
3374 ifp->flags,
3375 ifp->idev->dev->name);
3376 return 0;
3377 }
3378
3379 static const struct seq_operations if6_seq_ops = {
3380 .start = if6_seq_start,
3381 .next = if6_seq_next,
3382 .show = if6_seq_show,
3383 .stop = if6_seq_stop,
3384 };
3385
3386 static int if6_seq_open(struct inode *inode, struct file *file)
3387 {
3388 return seq_open_net(inode, file, &if6_seq_ops,
3389 sizeof(struct if6_iter_state));
3390 }
3391
3392 static const struct file_operations if6_fops = {
3393 .owner = THIS_MODULE,
3394 .open = if6_seq_open,
3395 .read = seq_read,
3396 .llseek = seq_lseek,
3397 .release = seq_release_net,
3398 };
3399
3400 static int __net_init if6_proc_net_init(struct net *net)
3401 {
3402 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3403 return -ENOMEM;
3404 return 0;
3405 }
3406
3407 static void __net_exit if6_proc_net_exit(struct net *net)
3408 {
3409 remove_proc_entry("if_inet6", net->proc_net);
3410 }
3411
3412 static struct pernet_operations if6_proc_net_ops = {
3413 .init = if6_proc_net_init,
3414 .exit = if6_proc_net_exit,
3415 };
3416
3417 int __init if6_proc_init(void)
3418 {
3419 return register_pernet_subsys(&if6_proc_net_ops);
3420 }
3421
3422 void if6_proc_exit(void)
3423 {
3424 unregister_pernet_subsys(&if6_proc_net_ops);
3425 }
3426 #endif /* CONFIG_PROC_FS */
3427
3428 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3429 /* Check if address is a home address configured on any interface. */
3430 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3431 {
3432 int ret = 0;
3433 struct inet6_ifaddr *ifp = NULL;
3434 unsigned int hash = inet6_addr_hash(addr);
3435
3436 rcu_read_lock_bh();
3437 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3438 if (!net_eq(dev_net(ifp->idev->dev), net))
3439 continue;
3440 if (ipv6_addr_equal(&ifp->addr, addr) &&
3441 (ifp->flags & IFA_F_HOMEADDRESS)) {
3442 ret = 1;
3443 break;
3444 }
3445 }
3446 rcu_read_unlock_bh();
3447 return ret;
3448 }
3449 #endif
3450
3451 /*
3452 * Periodic address status verification
3453 */
3454
3455 static void addrconf_verify(unsigned long foo)
3456 {
3457 unsigned long now, next, next_sec, next_sched;
3458 struct inet6_ifaddr *ifp;
3459 int i;
3460
3461 rcu_read_lock_bh();
3462 spin_lock(&addrconf_verify_lock);
3463 now = jiffies;
3464 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3465
3466 del_timer(&addr_chk_timer);
3467
3468 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3469 restart:
3470 hlist_for_each_entry_rcu_bh(ifp,
3471 &inet6_addr_lst[i], addr_lst) {
3472 unsigned long age;
3473
3474 /* When setting preferred_lft to a value not zero or
3475 * infinity, while valid_lft is infinity
3476 * IFA_F_PERMANENT has a non-infinity life time.
3477 */
3478 if ((ifp->flags & IFA_F_PERMANENT) &&
3479 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3480 continue;
3481
3482 spin_lock(&ifp->lock);
3483 /* We try to batch several events at once. */
3484 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3485
3486 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3487 age >= ifp->valid_lft) {
3488 spin_unlock(&ifp->lock);
3489 in6_ifa_hold(ifp);
3490 ipv6_del_addr(ifp);
3491 goto restart;
3492 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3493 spin_unlock(&ifp->lock);
3494 continue;
3495 } else if (age >= ifp->prefered_lft) {
3496 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3497 int deprecate = 0;
3498
3499 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3500 deprecate = 1;
3501 ifp->flags |= IFA_F_DEPRECATED;
3502 }
3503
3504 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3505 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3506 next = ifp->tstamp + ifp->valid_lft * HZ;
3507
3508 spin_unlock(&ifp->lock);
3509
3510 if (deprecate) {
3511 in6_ifa_hold(ifp);
3512
3513 ipv6_ifa_notify(0, ifp);
3514 in6_ifa_put(ifp);
3515 goto restart;
3516 }
3517 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3518 !(ifp->flags&IFA_F_TENTATIVE)) {
3519 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3520 ifp->idev->cnf.dad_transmits *
3521 ifp->idev->nd_parms->retrans_time / HZ;
3522
3523 if (age >= ifp->prefered_lft - regen_advance) {
3524 struct inet6_ifaddr *ifpub = ifp->ifpub;
3525 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3526 next = ifp->tstamp + ifp->prefered_lft * HZ;
3527 if (!ifp->regen_count && ifpub) {
3528 ifp->regen_count++;
3529 in6_ifa_hold(ifp);
3530 in6_ifa_hold(ifpub);
3531 spin_unlock(&ifp->lock);
3532
3533 spin_lock(&ifpub->lock);
3534 ifpub->regen_count = 0;
3535 spin_unlock(&ifpub->lock);
3536 ipv6_create_tempaddr(ifpub, ifp);
3537 in6_ifa_put(ifpub);
3538 in6_ifa_put(ifp);
3539 goto restart;
3540 }
3541 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3542 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3543 spin_unlock(&ifp->lock);
3544 } else {
3545 /* ifp->prefered_lft <= ifp->valid_lft */
3546 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3547 next = ifp->tstamp + ifp->prefered_lft * HZ;
3548 spin_unlock(&ifp->lock);
3549 }
3550 }
3551 }
3552
3553 next_sec = round_jiffies_up(next);
3554 next_sched = next;
3555
3556 /* If rounded timeout is accurate enough, accept it. */
3557 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3558 next_sched = next_sec;
3559
3560 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3561 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3562 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3563
3564 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3565 now, next, next_sec, next_sched);
3566
3567 addr_chk_timer.expires = next_sched;
3568 add_timer(&addr_chk_timer);
3569 spin_unlock(&addrconf_verify_lock);
3570 rcu_read_unlock_bh();
3571 }
3572
3573 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3574 struct in6_addr **peer_pfx)
3575 {
3576 struct in6_addr *pfx = NULL;
3577
3578 *peer_pfx = NULL;
3579
3580 if (addr)
3581 pfx = nla_data(addr);
3582
3583 if (local) {
3584 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3585 *peer_pfx = pfx;
3586 pfx = nla_data(local);
3587 }
3588
3589 return pfx;
3590 }
3591
3592 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3593 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3594 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3595 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3596 };
3597
3598 static int
3599 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3600 {
3601 struct net *net = sock_net(skb->sk);
3602 struct ifaddrmsg *ifm;
3603 struct nlattr *tb[IFA_MAX+1];
3604 struct in6_addr *pfx, *peer_pfx;
3605 int err;
3606
3607 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3608 if (err < 0)
3609 return err;
3610
3611 ifm = nlmsg_data(nlh);
3612 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3613 if (pfx == NULL)
3614 return -EINVAL;
3615
3616 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3617 }
3618
3619 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3620 u32 prefered_lft, u32 valid_lft)
3621 {
3622 u32 flags;
3623 clock_t expires;
3624 unsigned long timeout;
3625
3626 if (!valid_lft || (prefered_lft > valid_lft))
3627 return -EINVAL;
3628
3629 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3630 if (addrconf_finite_timeout(timeout)) {
3631 expires = jiffies_to_clock_t(timeout * HZ);
3632 valid_lft = timeout;
3633 flags = RTF_EXPIRES;
3634 } else {
3635 expires = 0;
3636 flags = 0;
3637 ifa_flags |= IFA_F_PERMANENT;
3638 }
3639
3640 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3641 if (addrconf_finite_timeout(timeout)) {
3642 if (timeout == 0)
3643 ifa_flags |= IFA_F_DEPRECATED;
3644 prefered_lft = timeout;
3645 }
3646
3647 spin_lock_bh(&ifp->lock);
3648 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3649 ifp->tstamp = jiffies;
3650 ifp->valid_lft = valid_lft;
3651 ifp->prefered_lft = prefered_lft;
3652
3653 spin_unlock_bh(&ifp->lock);
3654 if (!(ifp->flags&IFA_F_TENTATIVE))
3655 ipv6_ifa_notify(0, ifp);
3656
3657 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3658 expires, flags);
3659 addrconf_verify(0);
3660
3661 return 0;
3662 }
3663
3664 static int
3665 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3666 {
3667 struct net *net = sock_net(skb->sk);
3668 struct ifaddrmsg *ifm;
3669 struct nlattr *tb[IFA_MAX+1];
3670 struct in6_addr *pfx, *peer_pfx;
3671 struct inet6_ifaddr *ifa;
3672 struct net_device *dev;
3673 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3674 u8 ifa_flags;
3675 int err;
3676
3677 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3678 if (err < 0)
3679 return err;
3680
3681 ifm = nlmsg_data(nlh);
3682 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3683 if (pfx == NULL)
3684 return -EINVAL;
3685
3686 if (tb[IFA_CACHEINFO]) {
3687 struct ifa_cacheinfo *ci;
3688
3689 ci = nla_data(tb[IFA_CACHEINFO]);
3690 valid_lft = ci->ifa_valid;
3691 preferred_lft = ci->ifa_prefered;
3692 } else {
3693 preferred_lft = INFINITY_LIFE_TIME;
3694 valid_lft = INFINITY_LIFE_TIME;
3695 }
3696
3697 dev = __dev_get_by_index(net, ifm->ifa_index);
3698 if (dev == NULL)
3699 return -ENODEV;
3700
3701 /* We ignore other flags so far. */
3702 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3703
3704 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3705 if (ifa == NULL) {
3706 /*
3707 * It would be best to check for !NLM_F_CREATE here but
3708 * userspace alreay relies on not having to provide this.
3709 */
3710 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3711 ifm->ifa_prefixlen, ifa_flags,
3712 preferred_lft, valid_lft);
3713 }
3714
3715 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3716 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3717 err = -EEXIST;
3718 else
3719 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3720
3721 in6_ifa_put(ifa);
3722
3723 return err;
3724 }
3725
3726 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3727 u8 scope, int ifindex)
3728 {
3729 struct ifaddrmsg *ifm;
3730
3731 ifm = nlmsg_data(nlh);
3732 ifm->ifa_family = AF_INET6;
3733 ifm->ifa_prefixlen = prefixlen;
3734 ifm->ifa_flags = flags;
3735 ifm->ifa_scope = scope;
3736 ifm->ifa_index = ifindex;
3737 }
3738
3739 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3740 unsigned long tstamp, u32 preferred, u32 valid)
3741 {
3742 struct ifa_cacheinfo ci;
3743
3744 ci.cstamp = cstamp_delta(cstamp);
3745 ci.tstamp = cstamp_delta(tstamp);
3746 ci.ifa_prefered = preferred;
3747 ci.ifa_valid = valid;
3748
3749 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3750 }
3751
3752 static inline int rt_scope(int ifa_scope)
3753 {
3754 if (ifa_scope & IFA_HOST)
3755 return RT_SCOPE_HOST;
3756 else if (ifa_scope & IFA_LINK)
3757 return RT_SCOPE_LINK;
3758 else if (ifa_scope & IFA_SITE)
3759 return RT_SCOPE_SITE;
3760 else
3761 return RT_SCOPE_UNIVERSE;
3762 }
3763
3764 static inline int inet6_ifaddr_msgsize(void)
3765 {
3766 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3767 + nla_total_size(16) /* IFA_LOCAL */
3768 + nla_total_size(16) /* IFA_ADDRESS */
3769 + nla_total_size(sizeof(struct ifa_cacheinfo));
3770 }
3771
3772 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3773 u32 portid, u32 seq, int event, unsigned int flags)
3774 {
3775 struct nlmsghdr *nlh;
3776 u32 preferred, valid;
3777
3778 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3779 if (nlh == NULL)
3780 return -EMSGSIZE;
3781
3782 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3783 ifa->idev->dev->ifindex);
3784
3785 if (!((ifa->flags&IFA_F_PERMANENT) &&
3786 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
3787 preferred = ifa->prefered_lft;
3788 valid = ifa->valid_lft;
3789 if (preferred != INFINITY_LIFE_TIME) {
3790 long tval = (jiffies - ifa->tstamp)/HZ;
3791 if (preferred > tval)
3792 preferred -= tval;
3793 else
3794 preferred = 0;
3795 if (valid != INFINITY_LIFE_TIME) {
3796 if (valid > tval)
3797 valid -= tval;
3798 else
3799 valid = 0;
3800 }
3801 }
3802 } else {
3803 preferred = INFINITY_LIFE_TIME;
3804 valid = INFINITY_LIFE_TIME;
3805 }
3806
3807 if (!ipv6_addr_any(&ifa->peer_addr)) {
3808 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3809 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3810 goto error;
3811 } else
3812 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3813 goto error;
3814
3815 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3816 goto error;
3817
3818 return nlmsg_end(skb, nlh);
3819
3820 error:
3821 nlmsg_cancel(skb, nlh);
3822 return -EMSGSIZE;
3823 }
3824
3825 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3826 u32 portid, u32 seq, int event, u16 flags)
3827 {
3828 struct nlmsghdr *nlh;
3829 u8 scope = RT_SCOPE_UNIVERSE;
3830 int ifindex = ifmca->idev->dev->ifindex;
3831
3832 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3833 scope = RT_SCOPE_SITE;
3834
3835 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3836 if (nlh == NULL)
3837 return -EMSGSIZE;
3838
3839 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3840 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3841 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3842 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3843 nlmsg_cancel(skb, nlh);
3844 return -EMSGSIZE;
3845 }
3846
3847 return nlmsg_end(skb, nlh);
3848 }
3849
3850 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3851 u32 portid, u32 seq, int event, unsigned int flags)
3852 {
3853 struct nlmsghdr *nlh;
3854 u8 scope = RT_SCOPE_UNIVERSE;
3855 int ifindex = ifaca->aca_idev->dev->ifindex;
3856
3857 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3858 scope = RT_SCOPE_SITE;
3859
3860 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3861 if (nlh == NULL)
3862 return -EMSGSIZE;
3863
3864 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3865 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3866 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3867 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3868 nlmsg_cancel(skb, nlh);
3869 return -EMSGSIZE;
3870 }
3871
3872 return nlmsg_end(skb, nlh);
3873 }
3874
3875 enum addr_type_t {
3876 UNICAST_ADDR,
3877 MULTICAST_ADDR,
3878 ANYCAST_ADDR,
3879 };
3880
3881 /* called with rcu_read_lock() */
3882 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3883 struct netlink_callback *cb, enum addr_type_t type,
3884 int s_ip_idx, int *p_ip_idx)
3885 {
3886 struct ifmcaddr6 *ifmca;
3887 struct ifacaddr6 *ifaca;
3888 int err = 1;
3889 int ip_idx = *p_ip_idx;
3890
3891 read_lock_bh(&idev->lock);
3892 switch (type) {
3893 case UNICAST_ADDR: {
3894 struct inet6_ifaddr *ifa;
3895
3896 /* unicast address incl. temp addr */
3897 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3898 if (++ip_idx < s_ip_idx)
3899 continue;
3900 err = inet6_fill_ifaddr(skb, ifa,
3901 NETLINK_CB(cb->skb).portid,
3902 cb->nlh->nlmsg_seq,
3903 RTM_NEWADDR,
3904 NLM_F_MULTI);
3905 if (err <= 0)
3906 break;
3907 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3908 }
3909 break;
3910 }
3911 case MULTICAST_ADDR:
3912 /* multicast address */
3913 for (ifmca = idev->mc_list; ifmca;
3914 ifmca = ifmca->next, ip_idx++) {
3915 if (ip_idx < s_ip_idx)
3916 continue;
3917 err = inet6_fill_ifmcaddr(skb, ifmca,
3918 NETLINK_CB(cb->skb).portid,
3919 cb->nlh->nlmsg_seq,
3920 RTM_GETMULTICAST,
3921 NLM_F_MULTI);
3922 if (err <= 0)
3923 break;
3924 }
3925 break;
3926 case ANYCAST_ADDR:
3927 /* anycast address */
3928 for (ifaca = idev->ac_list; ifaca;
3929 ifaca = ifaca->aca_next, ip_idx++) {
3930 if (ip_idx < s_ip_idx)
3931 continue;
3932 err = inet6_fill_ifacaddr(skb, ifaca,
3933 NETLINK_CB(cb->skb).portid,
3934 cb->nlh->nlmsg_seq,
3935 RTM_GETANYCAST,
3936 NLM_F_MULTI);
3937 if (err <= 0)
3938 break;
3939 }
3940 break;
3941 default:
3942 break;
3943 }
3944 read_unlock_bh(&idev->lock);
3945 *p_ip_idx = ip_idx;
3946 return err;
3947 }
3948
3949 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3950 enum addr_type_t type)
3951 {
3952 struct net *net = sock_net(skb->sk);
3953 int h, s_h;
3954 int idx, ip_idx;
3955 int s_idx, s_ip_idx;
3956 struct net_device *dev;
3957 struct inet6_dev *idev;
3958 struct hlist_head *head;
3959
3960 s_h = cb->args[0];
3961 s_idx = idx = cb->args[1];
3962 s_ip_idx = ip_idx = cb->args[2];
3963
3964 rcu_read_lock();
3965 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
3966 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3967 idx = 0;
3968 head = &net->dev_index_head[h];
3969 hlist_for_each_entry_rcu(dev, head, index_hlist) {
3970 if (idx < s_idx)
3971 goto cont;
3972 if (h > s_h || idx > s_idx)
3973 s_ip_idx = 0;
3974 ip_idx = 0;
3975 idev = __in6_dev_get(dev);
3976 if (!idev)
3977 goto cont;
3978
3979 if (in6_dump_addrs(idev, skb, cb, type,
3980 s_ip_idx, &ip_idx) <= 0)
3981 goto done;
3982 cont:
3983 idx++;
3984 }
3985 }
3986 done:
3987 rcu_read_unlock();
3988 cb->args[0] = h;
3989 cb->args[1] = idx;
3990 cb->args[2] = ip_idx;
3991
3992 return skb->len;
3993 }
3994
3995 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3996 {
3997 enum addr_type_t type = UNICAST_ADDR;
3998
3999 return inet6_dump_addr(skb, cb, type);
4000 }
4001
4002 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4003 {
4004 enum addr_type_t type = MULTICAST_ADDR;
4005
4006 return inet6_dump_addr(skb, cb, type);
4007 }
4008
4009
4010 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4011 {
4012 enum addr_type_t type = ANYCAST_ADDR;
4013
4014 return inet6_dump_addr(skb, cb, type);
4015 }
4016
4017 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4018 {
4019 struct net *net = sock_net(in_skb->sk);
4020 struct ifaddrmsg *ifm;
4021 struct nlattr *tb[IFA_MAX+1];
4022 struct in6_addr *addr = NULL, *peer;
4023 struct net_device *dev = NULL;
4024 struct inet6_ifaddr *ifa;
4025 struct sk_buff *skb;
4026 int err;
4027
4028 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4029 if (err < 0)
4030 goto errout;
4031
4032 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4033 if (addr == NULL) {
4034 err = -EINVAL;
4035 goto errout;
4036 }
4037
4038 ifm = nlmsg_data(nlh);
4039 if (ifm->ifa_index)
4040 dev = __dev_get_by_index(net, ifm->ifa_index);
4041
4042 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4043 if (!ifa) {
4044 err = -EADDRNOTAVAIL;
4045 goto errout;
4046 }
4047
4048 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4049 if (!skb) {
4050 err = -ENOBUFS;
4051 goto errout_ifa;
4052 }
4053
4054 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4055 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4056 if (err < 0) {
4057 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4058 WARN_ON(err == -EMSGSIZE);
4059 kfree_skb(skb);
4060 goto errout_ifa;
4061 }
4062 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4063 errout_ifa:
4064 in6_ifa_put(ifa);
4065 errout:
4066 return err;
4067 }
4068
4069 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4070 {
4071 struct sk_buff *skb;
4072 struct net *net = dev_net(ifa->idev->dev);
4073 int err = -ENOBUFS;
4074
4075 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4076 if (skb == NULL)
4077 goto errout;
4078
4079 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4080 if (err < 0) {
4081 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4082 WARN_ON(err == -EMSGSIZE);
4083 kfree_skb(skb);
4084 goto errout;
4085 }
4086 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4087 return;
4088 errout:
4089 if (err < 0)
4090 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4091 }
4092
4093 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4094 __s32 *array, int bytes)
4095 {
4096 BUG_ON(bytes < (DEVCONF_MAX * 4));
4097
4098 memset(array, 0, bytes);
4099 array[DEVCONF_FORWARDING] = cnf->forwarding;
4100 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4101 array[DEVCONF_MTU6] = cnf->mtu6;
4102 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4103 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4104 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4105 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4106 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4107 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4108 jiffies_to_msecs(cnf->rtr_solicit_interval);
4109 array[DEVCONF_RTR_SOLICIT_DELAY] =
4110 jiffies_to_msecs(cnf->rtr_solicit_delay);
4111 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4112 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4113 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4114 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4115 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4116 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4117 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4118 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4119 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4120 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4121 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4122 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4123 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4124 #ifdef CONFIG_IPV6_ROUTER_PREF
4125 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4126 array[DEVCONF_RTR_PROBE_INTERVAL] =
4127 jiffies_to_msecs(cnf->rtr_probe_interval);
4128 #ifdef CONFIG_IPV6_ROUTE_INFO
4129 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4130 #endif
4131 #endif
4132 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4133 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4134 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4135 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4136 #endif
4137 #ifdef CONFIG_IPV6_MROUTE
4138 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4139 #endif
4140 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4141 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4142 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4143 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4144 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4145 }
4146
4147 static inline size_t inet6_ifla6_size(void)
4148 {
4149 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4150 + nla_total_size(sizeof(struct ifla_cacheinfo))
4151 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4152 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4153 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4154 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4155 }
4156
4157 static inline size_t inet6_if_nlmsg_size(void)
4158 {
4159 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4160 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4161 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4162 + nla_total_size(4) /* IFLA_MTU */
4163 + nla_total_size(4) /* IFLA_LINK */
4164 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4165 }
4166
4167 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4168 int items, int bytes)
4169 {
4170 int i;
4171 int pad = bytes - sizeof(u64) * items;
4172 BUG_ON(pad < 0);
4173
4174 /* Use put_unaligned() because stats may not be aligned for u64. */
4175 put_unaligned(items, &stats[0]);
4176 for (i = 1; i < items; i++)
4177 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4178
4179 memset(&stats[items], 0, pad);
4180 }
4181
4182 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4183 int items, int bytes, size_t syncpoff)
4184 {
4185 int i;
4186 int pad = bytes - sizeof(u64) * items;
4187 BUG_ON(pad < 0);
4188
4189 /* Use put_unaligned() because stats may not be aligned for u64. */
4190 put_unaligned(items, &stats[0]);
4191 for (i = 1; i < items; i++)
4192 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4193
4194 memset(&stats[items], 0, pad);
4195 }
4196
4197 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4198 int bytes)
4199 {
4200 switch (attrtype) {
4201 case IFLA_INET6_STATS:
4202 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4203 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4204 break;
4205 case IFLA_INET6_ICMP6STATS:
4206 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4207 break;
4208 }
4209 }
4210
4211 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4212 {
4213 struct nlattr *nla;
4214 struct ifla_cacheinfo ci;
4215
4216 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4217 goto nla_put_failure;
4218 ci.max_reasm_len = IPV6_MAXPLEN;
4219 ci.tstamp = cstamp_delta(idev->tstamp);
4220 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4221 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4222 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4223 goto nla_put_failure;
4224 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4225 if (nla == NULL)
4226 goto nla_put_failure;
4227 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4228
4229 /* XXX - MC not implemented */
4230
4231 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4232 if (nla == NULL)
4233 goto nla_put_failure;
4234 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4235
4236 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4237 if (nla == NULL)
4238 goto nla_put_failure;
4239 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4240
4241 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4242 if (nla == NULL)
4243 goto nla_put_failure;
4244 read_lock_bh(&idev->lock);
4245 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4246 read_unlock_bh(&idev->lock);
4247
4248 return 0;
4249
4250 nla_put_failure:
4251 return -EMSGSIZE;
4252 }
4253
4254 static size_t inet6_get_link_af_size(const struct net_device *dev)
4255 {
4256 if (!__in6_dev_get(dev))
4257 return 0;
4258
4259 return inet6_ifla6_size();
4260 }
4261
4262 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4263 {
4264 struct inet6_dev *idev = __in6_dev_get(dev);
4265
4266 if (!idev)
4267 return -ENODATA;
4268
4269 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4270 return -EMSGSIZE;
4271
4272 return 0;
4273 }
4274
4275 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4276 {
4277 struct inet6_ifaddr *ifp;
4278 struct net_device *dev = idev->dev;
4279 bool update_rs = false;
4280 struct in6_addr ll_addr;
4281
4282 if (token == NULL)
4283 return -EINVAL;
4284 if (ipv6_addr_any(token))
4285 return -EINVAL;
4286 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4287 return -EINVAL;
4288 if (!ipv6_accept_ra(idev))
4289 return -EINVAL;
4290 if (idev->cnf.rtr_solicits <= 0)
4291 return -EINVAL;
4292
4293 write_lock_bh(&idev->lock);
4294
4295 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4296 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4297
4298 write_unlock_bh(&idev->lock);
4299
4300 if (!idev->dead && (idev->if_flags & IF_READY) &&
4301 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4302 IFA_F_OPTIMISTIC)) {
4303
4304 /* If we're not ready, then normal ifup will take care
4305 * of this. Otherwise, we need to request our rs here.
4306 */
4307 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4308 update_rs = true;
4309 }
4310
4311 write_lock_bh(&idev->lock);
4312
4313 if (update_rs) {
4314 idev->if_flags |= IF_RS_SENT;
4315 idev->rs_probes = 1;
4316 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4317 }
4318
4319 /* Well, that's kinda nasty ... */
4320 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4321 spin_lock(&ifp->lock);
4322 if (ifp->tokenized) {
4323 ifp->valid_lft = 0;
4324 ifp->prefered_lft = 0;
4325 }
4326 spin_unlock(&ifp->lock);
4327 }
4328
4329 write_unlock_bh(&idev->lock);
4330 addrconf_verify(0);
4331 return 0;
4332 }
4333
4334 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4335 {
4336 int err = -EINVAL;
4337 struct inet6_dev *idev = __in6_dev_get(dev);
4338 struct nlattr *tb[IFLA_INET6_MAX + 1];
4339
4340 if (!idev)
4341 return -EAFNOSUPPORT;
4342
4343 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4344 BUG();
4345
4346 if (tb[IFLA_INET6_TOKEN])
4347 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4348
4349 return err;
4350 }
4351
4352 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4353 u32 portid, u32 seq, int event, unsigned int flags)
4354 {
4355 struct net_device *dev = idev->dev;
4356 struct ifinfomsg *hdr;
4357 struct nlmsghdr *nlh;
4358 void *protoinfo;
4359
4360 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4361 if (nlh == NULL)
4362 return -EMSGSIZE;
4363
4364 hdr = nlmsg_data(nlh);
4365 hdr->ifi_family = AF_INET6;
4366 hdr->__ifi_pad = 0;
4367 hdr->ifi_type = dev->type;
4368 hdr->ifi_index = dev->ifindex;
4369 hdr->ifi_flags = dev_get_flags(dev);
4370 hdr->ifi_change = 0;
4371
4372 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4373 (dev->addr_len &&
4374 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4375 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4376 (dev->ifindex != dev->iflink &&
4377 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4378 goto nla_put_failure;
4379 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4380 if (protoinfo == NULL)
4381 goto nla_put_failure;
4382
4383 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4384 goto nla_put_failure;
4385
4386 nla_nest_end(skb, protoinfo);
4387 return nlmsg_end(skb, nlh);
4388
4389 nla_put_failure:
4390 nlmsg_cancel(skb, nlh);
4391 return -EMSGSIZE;
4392 }
4393
4394 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4395 {
4396 struct net *net = sock_net(skb->sk);
4397 int h, s_h;
4398 int idx = 0, s_idx;
4399 struct net_device *dev;
4400 struct inet6_dev *idev;
4401 struct hlist_head *head;
4402
4403 s_h = cb->args[0];
4404 s_idx = cb->args[1];
4405
4406 rcu_read_lock();
4407 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4408 idx = 0;
4409 head = &net->dev_index_head[h];
4410 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4411 if (idx < s_idx)
4412 goto cont;
4413 idev = __in6_dev_get(dev);
4414 if (!idev)
4415 goto cont;
4416 if (inet6_fill_ifinfo(skb, idev,
4417 NETLINK_CB(cb->skb).portid,
4418 cb->nlh->nlmsg_seq,
4419 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4420 goto out;
4421 cont:
4422 idx++;
4423 }
4424 }
4425 out:
4426 rcu_read_unlock();
4427 cb->args[1] = idx;
4428 cb->args[0] = h;
4429
4430 return skb->len;
4431 }
4432
4433 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4434 {
4435 struct sk_buff *skb;
4436 struct net *net = dev_net(idev->dev);
4437 int err = -ENOBUFS;
4438
4439 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4440 if (skb == NULL)
4441 goto errout;
4442
4443 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4444 if (err < 0) {
4445 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4446 WARN_ON(err == -EMSGSIZE);
4447 kfree_skb(skb);
4448 goto errout;
4449 }
4450 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4451 return;
4452 errout:
4453 if (err < 0)
4454 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4455 }
4456
4457 static inline size_t inet6_prefix_nlmsg_size(void)
4458 {
4459 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4460 + nla_total_size(sizeof(struct in6_addr))
4461 + nla_total_size(sizeof(struct prefix_cacheinfo));
4462 }
4463
4464 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4465 struct prefix_info *pinfo, u32 portid, u32 seq,
4466 int event, unsigned int flags)
4467 {
4468 struct prefixmsg *pmsg;
4469 struct nlmsghdr *nlh;
4470 struct prefix_cacheinfo ci;
4471
4472 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4473 if (nlh == NULL)
4474 return -EMSGSIZE;
4475
4476 pmsg = nlmsg_data(nlh);
4477 pmsg->prefix_family = AF_INET6;
4478 pmsg->prefix_pad1 = 0;
4479 pmsg->prefix_pad2 = 0;
4480 pmsg->prefix_ifindex = idev->dev->ifindex;
4481 pmsg->prefix_len = pinfo->prefix_len;
4482 pmsg->prefix_type = pinfo->type;
4483 pmsg->prefix_pad3 = 0;
4484 pmsg->prefix_flags = 0;
4485 if (pinfo->onlink)
4486 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4487 if (pinfo->autoconf)
4488 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4489
4490 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4491 goto nla_put_failure;
4492 ci.preferred_time = ntohl(pinfo->prefered);
4493 ci.valid_time = ntohl(pinfo->valid);
4494 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4495 goto nla_put_failure;
4496 return nlmsg_end(skb, nlh);
4497
4498 nla_put_failure:
4499 nlmsg_cancel(skb, nlh);
4500 return -EMSGSIZE;
4501 }
4502
4503 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4504 struct prefix_info *pinfo)
4505 {
4506 struct sk_buff *skb;
4507 struct net *net = dev_net(idev->dev);
4508 int err = -ENOBUFS;
4509
4510 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4511 if (skb == NULL)
4512 goto errout;
4513
4514 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4515 if (err < 0) {
4516 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4517 WARN_ON(err == -EMSGSIZE);
4518 kfree_skb(skb);
4519 goto errout;
4520 }
4521 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4522 return;
4523 errout:
4524 if (err < 0)
4525 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4526 }
4527
4528 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4529 {
4530 struct net *net = dev_net(ifp->idev->dev);
4531
4532 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4533
4534 switch (event) {
4535 case RTM_NEWADDR:
4536 /*
4537 * If the address was optimistic
4538 * we inserted the route at the start of
4539 * our DAD process, so we don't need
4540 * to do it again
4541 */
4542 if (!(ifp->rt->rt6i_node))
4543 ip6_ins_rt(ifp->rt);
4544 if (ifp->idev->cnf.forwarding)
4545 addrconf_join_anycast(ifp);
4546 if (!ipv6_addr_any(&ifp->peer_addr))
4547 addrconf_prefix_route(&ifp->peer_addr, 128,
4548 ifp->idev->dev, 0, 0);
4549 break;
4550 case RTM_DELADDR:
4551 if (ifp->idev->cnf.forwarding)
4552 addrconf_leave_anycast(ifp);
4553 addrconf_leave_solict(ifp->idev, &ifp->addr);
4554 if (!ipv6_addr_any(&ifp->peer_addr)) {
4555 struct rt6_info *rt;
4556 struct net_device *dev = ifp->idev->dev;
4557
4558 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4559 dev->ifindex, 1);
4560 if (rt) {
4561 dst_hold(&rt->dst);
4562 if (ip6_del_rt(rt))
4563 dst_free(&rt->dst);
4564 }
4565 }
4566 dst_hold(&ifp->rt->dst);
4567
4568 if (ip6_del_rt(ifp->rt))
4569 dst_free(&ifp->rt->dst);
4570 break;
4571 }
4572 atomic_inc(&net->ipv6.dev_addr_genid);
4573 rt_genid_bump_ipv6(net);
4574 }
4575
4576 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4577 {
4578 rcu_read_lock_bh();
4579 if (likely(ifp->idev->dead == 0))
4580 __ipv6_ifa_notify(event, ifp);
4581 rcu_read_unlock_bh();
4582 }
4583
4584 #ifdef CONFIG_SYSCTL
4585
4586 static
4587 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4588 void __user *buffer, size_t *lenp, loff_t *ppos)
4589 {
4590 int *valp = ctl->data;
4591 int val = *valp;
4592 loff_t pos = *ppos;
4593 struct ctl_table lctl;
4594 int ret;
4595
4596 /*
4597 * ctl->data points to idev->cnf.forwarding, we should
4598 * not modify it until we get the rtnl lock.
4599 */
4600 lctl = *ctl;
4601 lctl.data = &val;
4602
4603 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4604
4605 if (write)
4606 ret = addrconf_fixup_forwarding(ctl, valp, val);
4607 if (ret)
4608 *ppos = pos;
4609 return ret;
4610 }
4611
4612 static void dev_disable_change(struct inet6_dev *idev)
4613 {
4614 struct netdev_notifier_info info;
4615
4616 if (!idev || !idev->dev)
4617 return;
4618
4619 netdev_notifier_info_init(&info, idev->dev);
4620 if (idev->cnf.disable_ipv6)
4621 addrconf_notify(NULL, NETDEV_DOWN, &info);
4622 else
4623 addrconf_notify(NULL, NETDEV_UP, &info);
4624 }
4625
4626 static void addrconf_disable_change(struct net *net, __s32 newf)
4627 {
4628 struct net_device *dev;
4629 struct inet6_dev *idev;
4630
4631 rcu_read_lock();
4632 for_each_netdev_rcu(net, dev) {
4633 idev = __in6_dev_get(dev);
4634 if (idev) {
4635 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4636 idev->cnf.disable_ipv6 = newf;
4637 if (changed)
4638 dev_disable_change(idev);
4639 }
4640 }
4641 rcu_read_unlock();
4642 }
4643
4644 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4645 {
4646 struct net *net;
4647 int old;
4648
4649 if (!rtnl_trylock())
4650 return restart_syscall();
4651
4652 net = (struct net *)table->extra2;
4653 old = *p;
4654 *p = newf;
4655
4656 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4657 rtnl_unlock();
4658 return 0;
4659 }
4660
4661 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4662 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4663 addrconf_disable_change(net, newf);
4664 } else if ((!newf) ^ (!old))
4665 dev_disable_change((struct inet6_dev *)table->extra1);
4666
4667 rtnl_unlock();
4668 return 0;
4669 }
4670
4671 static
4672 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4673 void __user *buffer, size_t *lenp, loff_t *ppos)
4674 {
4675 int *valp = ctl->data;
4676 int val = *valp;
4677 loff_t pos = *ppos;
4678 struct ctl_table lctl;
4679 int ret;
4680
4681 /*
4682 * ctl->data points to idev->cnf.disable_ipv6, we should
4683 * not modify it until we get the rtnl lock.
4684 */
4685 lctl = *ctl;
4686 lctl.data = &val;
4687
4688 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4689
4690 if (write)
4691 ret = addrconf_disable_ipv6(ctl, valp, val);
4692 if (ret)
4693 *ppos = pos;
4694 return ret;
4695 }
4696
4697 static struct addrconf_sysctl_table
4698 {
4699 struct ctl_table_header *sysctl_header;
4700 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4701 } addrconf_sysctl __read_mostly = {
4702 .sysctl_header = NULL,
4703 .addrconf_vars = {
4704 {
4705 .procname = "forwarding",
4706 .data = &ipv6_devconf.forwarding,
4707 .maxlen = sizeof(int),
4708 .mode = 0644,
4709 .proc_handler = addrconf_sysctl_forward,
4710 },
4711 {
4712 .procname = "hop_limit",
4713 .data = &ipv6_devconf.hop_limit,
4714 .maxlen = sizeof(int),
4715 .mode = 0644,
4716 .proc_handler = proc_dointvec,
4717 },
4718 {
4719 .procname = "mtu",
4720 .data = &ipv6_devconf.mtu6,
4721 .maxlen = sizeof(int),
4722 .mode = 0644,
4723 .proc_handler = proc_dointvec,
4724 },
4725 {
4726 .procname = "accept_ra",
4727 .data = &ipv6_devconf.accept_ra,
4728 .maxlen = sizeof(int),
4729 .mode = 0644,
4730 .proc_handler = proc_dointvec,
4731 },
4732 {
4733 .procname = "accept_redirects",
4734 .data = &ipv6_devconf.accept_redirects,
4735 .maxlen = sizeof(int),
4736 .mode = 0644,
4737 .proc_handler = proc_dointvec,
4738 },
4739 {
4740 .procname = "autoconf",
4741 .data = &ipv6_devconf.autoconf,
4742 .maxlen = sizeof(int),
4743 .mode = 0644,
4744 .proc_handler = proc_dointvec,
4745 },
4746 {
4747 .procname = "dad_transmits",
4748 .data = &ipv6_devconf.dad_transmits,
4749 .maxlen = sizeof(int),
4750 .mode = 0644,
4751 .proc_handler = proc_dointvec,
4752 },
4753 {
4754 .procname = "router_solicitations",
4755 .data = &ipv6_devconf.rtr_solicits,
4756 .maxlen = sizeof(int),
4757 .mode = 0644,
4758 .proc_handler = proc_dointvec,
4759 },
4760 {
4761 .procname = "router_solicitation_interval",
4762 .data = &ipv6_devconf.rtr_solicit_interval,
4763 .maxlen = sizeof(int),
4764 .mode = 0644,
4765 .proc_handler = proc_dointvec_jiffies,
4766 },
4767 {
4768 .procname = "router_solicitation_delay",
4769 .data = &ipv6_devconf.rtr_solicit_delay,
4770 .maxlen = sizeof(int),
4771 .mode = 0644,
4772 .proc_handler = proc_dointvec_jiffies,
4773 },
4774 {
4775 .procname = "force_mld_version",
4776 .data = &ipv6_devconf.force_mld_version,
4777 .maxlen = sizeof(int),
4778 .mode = 0644,
4779 .proc_handler = proc_dointvec,
4780 },
4781 {
4782 .procname = "mldv1_unsolicited_report_interval",
4783 .data =
4784 &ipv6_devconf.mldv1_unsolicited_report_interval,
4785 .maxlen = sizeof(int),
4786 .mode = 0644,
4787 .proc_handler = proc_dointvec_ms_jiffies,
4788 },
4789 {
4790 .procname = "mldv2_unsolicited_report_interval",
4791 .data =
4792 &ipv6_devconf.mldv2_unsolicited_report_interval,
4793 .maxlen = sizeof(int),
4794 .mode = 0644,
4795 .proc_handler = proc_dointvec_ms_jiffies,
4796 },
4797 {
4798 .procname = "use_tempaddr",
4799 .data = &ipv6_devconf.use_tempaddr,
4800 .maxlen = sizeof(int),
4801 .mode = 0644,
4802 .proc_handler = proc_dointvec,
4803 },
4804 {
4805 .procname = "temp_valid_lft",
4806 .data = &ipv6_devconf.temp_valid_lft,
4807 .maxlen = sizeof(int),
4808 .mode = 0644,
4809 .proc_handler = proc_dointvec,
4810 },
4811 {
4812 .procname = "temp_prefered_lft",
4813 .data = &ipv6_devconf.temp_prefered_lft,
4814 .maxlen = sizeof(int),
4815 .mode = 0644,
4816 .proc_handler = proc_dointvec,
4817 },
4818 {
4819 .procname = "regen_max_retry",
4820 .data = &ipv6_devconf.regen_max_retry,
4821 .maxlen = sizeof(int),
4822 .mode = 0644,
4823 .proc_handler = proc_dointvec,
4824 },
4825 {
4826 .procname = "max_desync_factor",
4827 .data = &ipv6_devconf.max_desync_factor,
4828 .maxlen = sizeof(int),
4829 .mode = 0644,
4830 .proc_handler = proc_dointvec,
4831 },
4832 {
4833 .procname = "max_addresses",
4834 .data = &ipv6_devconf.max_addresses,
4835 .maxlen = sizeof(int),
4836 .mode = 0644,
4837 .proc_handler = proc_dointvec,
4838 },
4839 {
4840 .procname = "accept_ra_defrtr",
4841 .data = &ipv6_devconf.accept_ra_defrtr,
4842 .maxlen = sizeof(int),
4843 .mode = 0644,
4844 .proc_handler = proc_dointvec,
4845 },
4846 {
4847 .procname = "accept_ra_pinfo",
4848 .data = &ipv6_devconf.accept_ra_pinfo,
4849 .maxlen = sizeof(int),
4850 .mode = 0644,
4851 .proc_handler = proc_dointvec,
4852 },
4853 #ifdef CONFIG_IPV6_ROUTER_PREF
4854 {
4855 .procname = "accept_ra_rtr_pref",
4856 .data = &ipv6_devconf.accept_ra_rtr_pref,
4857 .maxlen = sizeof(int),
4858 .mode = 0644,
4859 .proc_handler = proc_dointvec,
4860 },
4861 {
4862 .procname = "router_probe_interval",
4863 .data = &ipv6_devconf.rtr_probe_interval,
4864 .maxlen = sizeof(int),
4865 .mode = 0644,
4866 .proc_handler = proc_dointvec_jiffies,
4867 },
4868 #ifdef CONFIG_IPV6_ROUTE_INFO
4869 {
4870 .procname = "accept_ra_rt_info_max_plen",
4871 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4872 .maxlen = sizeof(int),
4873 .mode = 0644,
4874 .proc_handler = proc_dointvec,
4875 },
4876 #endif
4877 #endif
4878 {
4879 .procname = "proxy_ndp",
4880 .data = &ipv6_devconf.proxy_ndp,
4881 .maxlen = sizeof(int),
4882 .mode = 0644,
4883 .proc_handler = proc_dointvec,
4884 },
4885 {
4886 .procname = "accept_source_route",
4887 .data = &ipv6_devconf.accept_source_route,
4888 .maxlen = sizeof(int),
4889 .mode = 0644,
4890 .proc_handler = proc_dointvec,
4891 },
4892 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4893 {
4894 .procname = "optimistic_dad",
4895 .data = &ipv6_devconf.optimistic_dad,
4896 .maxlen = sizeof(int),
4897 .mode = 0644,
4898 .proc_handler = proc_dointvec,
4899
4900 },
4901 #endif
4902 #ifdef CONFIG_IPV6_MROUTE
4903 {
4904 .procname = "mc_forwarding",
4905 .data = &ipv6_devconf.mc_forwarding,
4906 .maxlen = sizeof(int),
4907 .mode = 0444,
4908 .proc_handler = proc_dointvec,
4909 },
4910 #endif
4911 {
4912 .procname = "disable_ipv6",
4913 .data = &ipv6_devconf.disable_ipv6,
4914 .maxlen = sizeof(int),
4915 .mode = 0644,
4916 .proc_handler = addrconf_sysctl_disable,
4917 },
4918 {
4919 .procname = "accept_dad",
4920 .data = &ipv6_devconf.accept_dad,
4921 .maxlen = sizeof(int),
4922 .mode = 0644,
4923 .proc_handler = proc_dointvec,
4924 },
4925 {
4926 .procname = "force_tllao",
4927 .data = &ipv6_devconf.force_tllao,
4928 .maxlen = sizeof(int),
4929 .mode = 0644,
4930 .proc_handler = proc_dointvec
4931 },
4932 {
4933 .procname = "ndisc_notify",
4934 .data = &ipv6_devconf.ndisc_notify,
4935 .maxlen = sizeof(int),
4936 .mode = 0644,
4937 .proc_handler = proc_dointvec
4938 },
4939 {
4940 .procname = "suppress_frag_ndisc",
4941 .data = &ipv6_devconf.suppress_frag_ndisc,
4942 .maxlen = sizeof(int),
4943 .mode = 0644,
4944 .proc_handler = proc_dointvec
4945 },
4946 {
4947 /* sentinel */
4948 }
4949 },
4950 };
4951
4952 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4953 struct inet6_dev *idev, struct ipv6_devconf *p)
4954 {
4955 int i;
4956 struct addrconf_sysctl_table *t;
4957 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4958
4959 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4960 if (t == NULL)
4961 goto out;
4962
4963 for (i = 0; t->addrconf_vars[i].data; i++) {
4964 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4965 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4966 t->addrconf_vars[i].extra2 = net;
4967 }
4968
4969 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4970
4971 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4972 if (t->sysctl_header == NULL)
4973 goto free;
4974
4975 p->sysctl = t;
4976 return 0;
4977
4978 free:
4979 kfree(t);
4980 out:
4981 return -ENOBUFS;
4982 }
4983
4984 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4985 {
4986 struct addrconf_sysctl_table *t;
4987
4988 if (p->sysctl == NULL)
4989 return;
4990
4991 t = p->sysctl;
4992 p->sysctl = NULL;
4993 unregister_net_sysctl_table(t->sysctl_header);
4994 kfree(t);
4995 }
4996
4997 static void addrconf_sysctl_register(struct inet6_dev *idev)
4998 {
4999 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
5000 &ndisc_ifinfo_sysctl_change);
5001 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5002 idev, &idev->cnf);
5003 }
5004
5005 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5006 {
5007 __addrconf_sysctl_unregister(&idev->cnf);
5008 neigh_sysctl_unregister(idev->nd_parms);
5009 }
5010
5011
5012 #endif
5013
5014 static int __net_init addrconf_init_net(struct net *net)
5015 {
5016 int err = -ENOMEM;
5017 struct ipv6_devconf *all, *dflt;
5018
5019 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5020 if (all == NULL)
5021 goto err_alloc_all;
5022
5023 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5024 if (dflt == NULL)
5025 goto err_alloc_dflt;
5026
5027 /* these will be inherited by all namespaces */
5028 dflt->autoconf = ipv6_defaults.autoconf;
5029 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5030
5031 net->ipv6.devconf_all = all;
5032 net->ipv6.devconf_dflt = dflt;
5033
5034 #ifdef CONFIG_SYSCTL
5035 err = __addrconf_sysctl_register(net, "all", NULL, all);
5036 if (err < 0)
5037 goto err_reg_all;
5038
5039 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5040 if (err < 0)
5041 goto err_reg_dflt;
5042 #endif
5043 return 0;
5044
5045 #ifdef CONFIG_SYSCTL
5046 err_reg_dflt:
5047 __addrconf_sysctl_unregister(all);
5048 err_reg_all:
5049 kfree(dflt);
5050 #endif
5051 err_alloc_dflt:
5052 kfree(all);
5053 err_alloc_all:
5054 return err;
5055 }
5056
5057 static void __net_exit addrconf_exit_net(struct net *net)
5058 {
5059 #ifdef CONFIG_SYSCTL
5060 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5061 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5062 #endif
5063 if (!net_eq(net, &init_net)) {
5064 kfree(net->ipv6.devconf_dflt);
5065 kfree(net->ipv6.devconf_all);
5066 }
5067 }
5068
5069 static struct pernet_operations addrconf_ops = {
5070 .init = addrconf_init_net,
5071 .exit = addrconf_exit_net,
5072 };
5073
5074 static struct rtnl_af_ops inet6_ops = {
5075 .family = AF_INET6,
5076 .fill_link_af = inet6_fill_link_af,
5077 .get_link_af_size = inet6_get_link_af_size,
5078 .set_link_af = inet6_set_link_af,
5079 };
5080
5081 /*
5082 * Init / cleanup code
5083 */
5084
5085 int __init addrconf_init(void)
5086 {
5087 int i, err;
5088
5089 err = ipv6_addr_label_init();
5090 if (err < 0) {
5091 pr_crit("%s: cannot initialize default policy table: %d\n",
5092 __func__, err);
5093 goto out;
5094 }
5095
5096 err = register_pernet_subsys(&addrconf_ops);
5097 if (err < 0)
5098 goto out_addrlabel;
5099
5100 /* The addrconf netdev notifier requires that loopback_dev
5101 * has it's ipv6 private information allocated and setup
5102 * before it can bring up and give link-local addresses
5103 * to other devices which are up.
5104 *
5105 * Unfortunately, loopback_dev is not necessarily the first
5106 * entry in the global dev_base list of net devices. In fact,
5107 * it is likely to be the very last entry on that list.
5108 * So this causes the notifier registry below to try and
5109 * give link-local addresses to all devices besides loopback_dev
5110 * first, then loopback_dev, which cases all the non-loopback_dev
5111 * devices to fail to get a link-local address.
5112 *
5113 * So, as a temporary fix, allocate the ipv6 structure for
5114 * loopback_dev first by hand.
5115 * Longer term, all of the dependencies ipv6 has upon the loopback
5116 * device and it being up should be removed.
5117 */
5118 rtnl_lock();
5119 if (!ipv6_add_dev(init_net.loopback_dev))
5120 err = -ENOMEM;
5121 rtnl_unlock();
5122 if (err)
5123 goto errlo;
5124
5125 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5126 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5127
5128 register_netdevice_notifier(&ipv6_dev_notf);
5129
5130 addrconf_verify(0);
5131
5132 err = rtnl_af_register(&inet6_ops);
5133 if (err < 0)
5134 goto errout_af;
5135
5136 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5137 NULL);
5138 if (err < 0)
5139 goto errout;
5140
5141 /* Only the first call to __rtnl_register can fail */
5142 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5143 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5144 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5145 inet6_dump_ifaddr, NULL);
5146 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5147 inet6_dump_ifmcaddr, NULL);
5148 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5149 inet6_dump_ifacaddr, NULL);
5150 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5151 inet6_netconf_dump_devconf, NULL);
5152
5153 ipv6_addr_label_rtnl_register();
5154
5155 return 0;
5156 errout:
5157 rtnl_af_unregister(&inet6_ops);
5158 errout_af:
5159 unregister_netdevice_notifier(&ipv6_dev_notf);
5160 errlo:
5161 unregister_pernet_subsys(&addrconf_ops);
5162 out_addrlabel:
5163 ipv6_addr_label_cleanup();
5164 out:
5165 return err;
5166 }
5167
5168 void addrconf_cleanup(void)
5169 {
5170 struct net_device *dev;
5171 int i;
5172
5173 unregister_netdevice_notifier(&ipv6_dev_notf);
5174 unregister_pernet_subsys(&addrconf_ops);
5175 ipv6_addr_label_cleanup();
5176
5177 rtnl_lock();
5178
5179 __rtnl_af_unregister(&inet6_ops);
5180
5181 /* clean dev list */
5182 for_each_netdev(&init_net, dev) {
5183 if (__in6_dev_get(dev) == NULL)
5184 continue;
5185 addrconf_ifdown(dev, 1);
5186 }
5187 addrconf_ifdown(init_net.loopback_dev, 2);
5188
5189 /*
5190 * Check hash table.
5191 */
5192 spin_lock_bh(&addrconf_hash_lock);
5193 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5194 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5195 spin_unlock_bh(&addrconf_hash_lock);
5196
5197 del_timer(&addr_chk_timer);
5198 rtnl_unlock();
5199 }
Linux kernel - Deliverables
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