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ipv6: Remove privacy config option.
[mirror_ubuntu-bionic-kernel.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 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
275 sizeof(struct ipstats_mib),
276 __alignof__(struct ipstats_mib)) < 0)
277 goto err_ip;
278 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
279 GFP_KERNEL);
280 if (!idev->stats.icmpv6dev)
281 goto err_icmp;
282 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
283 GFP_KERNEL);
284 if (!idev->stats.icmpv6msgdev)
285 goto err_icmpmsg;
286
287 return 0;
288
289 err_icmpmsg:
290 kfree(idev->stats.icmpv6dev);
291 err_icmp:
292 snmp_mib_free((void __percpu **)idev->stats.ipv6);
293 err_ip:
294 return -ENOMEM;
295 }
296
297 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
298 {
299 struct inet6_dev *ndev;
300
301 ASSERT_RTNL();
302
303 if (dev->mtu < IPV6_MIN_MTU)
304 return NULL;
305
306 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
307
308 if (ndev == NULL)
309 return NULL;
310
311 rwlock_init(&ndev->lock);
312 ndev->dev = dev;
313 INIT_LIST_HEAD(&ndev->addr_list);
314 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
315 (unsigned long)ndev);
316 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
317 ndev->cnf.mtu6 = dev->mtu;
318 ndev->cnf.sysctl = NULL;
319 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
320 if (ndev->nd_parms == NULL) {
321 kfree(ndev);
322 return NULL;
323 }
324 if (ndev->cnf.forwarding)
325 dev_disable_lro(dev);
326 /* We refer to the device */
327 dev_hold(dev);
328
329 if (snmp6_alloc_dev(ndev) < 0) {
330 ADBG(KERN_WARNING
331 "%s: cannot allocate memory for statistics; dev=%s.\n",
332 __func__, dev->name);
333 neigh_parms_release(&nd_tbl, ndev->nd_parms);
334 dev_put(dev);
335 kfree(ndev);
336 return NULL;
337 }
338
339 if (snmp6_register_dev(ndev) < 0) {
340 ADBG(KERN_WARNING
341 "%s: cannot create /proc/net/dev_snmp6/%s\n",
342 __func__, dev->name);
343 neigh_parms_release(&nd_tbl, ndev->nd_parms);
344 ndev->dead = 1;
345 in6_dev_finish_destroy(ndev);
346 return NULL;
347 }
348
349 /* One reference from device. We must do this before
350 * we invoke __ipv6_regen_rndid().
351 */
352 in6_dev_hold(ndev);
353
354 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
355 ndev->cnf.accept_dad = -1;
356
357 #if IS_ENABLED(CONFIG_IPV6_SIT)
358 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
359 pr_info("%s: Disabled Multicast RS\n", dev->name);
360 ndev->cnf.rtr_solicits = 0;
361 }
362 #endif
363
364 INIT_LIST_HEAD(&ndev->tempaddr_list);
365 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
366 if ((dev->flags&IFF_LOOPBACK) ||
367 dev->type == ARPHRD_TUNNEL ||
368 dev->type == ARPHRD_TUNNEL6 ||
369 dev->type == ARPHRD_SIT ||
370 dev->type == ARPHRD_NONE) {
371 ndev->cnf.use_tempaddr = -1;
372 } else {
373 in6_dev_hold(ndev);
374 ipv6_regen_rndid((unsigned long) ndev);
375 }
376
377 ndev->token = in6addr_any;
378
379 if (netif_running(dev) && addrconf_qdisc_ok(dev))
380 ndev->if_flags |= IF_READY;
381
382 ipv6_mc_init_dev(ndev);
383 ndev->tstamp = jiffies;
384 addrconf_sysctl_register(ndev);
385 /* protected by rtnl_lock */
386 rcu_assign_pointer(dev->ip6_ptr, ndev);
387
388 /* Join interface-local all-node multicast group */
389 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
390
391 /* Join all-node multicast group */
392 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
393
394 /* Join all-router multicast group if forwarding is set */
395 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
396 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
397
398 return ndev;
399 }
400
401 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
402 {
403 struct inet6_dev *idev;
404
405 ASSERT_RTNL();
406
407 idev = __in6_dev_get(dev);
408 if (!idev) {
409 idev = ipv6_add_dev(dev);
410 if (!idev)
411 return NULL;
412 }
413
414 if (dev->flags&IFF_UP)
415 ipv6_mc_up(idev);
416 return idev;
417 }
418
419 static int inet6_netconf_msgsize_devconf(int type)
420 {
421 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
422 + nla_total_size(4); /* NETCONFA_IFINDEX */
423
424 /* type -1 is used for ALL */
425 if (type == -1 || type == NETCONFA_FORWARDING)
426 size += nla_total_size(4);
427 #ifdef CONFIG_IPV6_MROUTE
428 if (type == -1 || type == NETCONFA_MC_FORWARDING)
429 size += nla_total_size(4);
430 #endif
431
432 return size;
433 }
434
435 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
436 struct ipv6_devconf *devconf, u32 portid,
437 u32 seq, int event, unsigned int flags,
438 int type)
439 {
440 struct nlmsghdr *nlh;
441 struct netconfmsg *ncm;
442
443 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
444 flags);
445 if (nlh == NULL)
446 return -EMSGSIZE;
447
448 ncm = nlmsg_data(nlh);
449 ncm->ncm_family = AF_INET6;
450
451 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
452 goto nla_put_failure;
453
454 /* type -1 is used for ALL */
455 if ((type == -1 || type == NETCONFA_FORWARDING) &&
456 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
457 goto nla_put_failure;
458 #ifdef CONFIG_IPV6_MROUTE
459 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
460 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
461 devconf->mc_forwarding) < 0)
462 goto nla_put_failure;
463 #endif
464 return nlmsg_end(skb, nlh);
465
466 nla_put_failure:
467 nlmsg_cancel(skb, nlh);
468 return -EMSGSIZE;
469 }
470
471 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
472 struct ipv6_devconf *devconf)
473 {
474 struct sk_buff *skb;
475 int err = -ENOBUFS;
476
477 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
478 if (skb == NULL)
479 goto errout;
480
481 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
482 RTM_NEWNETCONF, 0, type);
483 if (err < 0) {
484 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
485 WARN_ON(err == -EMSGSIZE);
486 kfree_skb(skb);
487 goto errout;
488 }
489 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
490 return;
491 errout:
492 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
493 }
494
495 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
496 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
497 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
498 };
499
500 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
501 struct nlmsghdr *nlh)
502 {
503 struct net *net = sock_net(in_skb->sk);
504 struct nlattr *tb[NETCONFA_MAX+1];
505 struct netconfmsg *ncm;
506 struct sk_buff *skb;
507 struct ipv6_devconf *devconf;
508 struct inet6_dev *in6_dev;
509 struct net_device *dev;
510 int ifindex;
511 int err;
512
513 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
514 devconf_ipv6_policy);
515 if (err < 0)
516 goto errout;
517
518 err = EINVAL;
519 if (!tb[NETCONFA_IFINDEX])
520 goto errout;
521
522 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
523 switch (ifindex) {
524 case NETCONFA_IFINDEX_ALL:
525 devconf = net->ipv6.devconf_all;
526 break;
527 case NETCONFA_IFINDEX_DEFAULT:
528 devconf = net->ipv6.devconf_dflt;
529 break;
530 default:
531 dev = __dev_get_by_index(net, ifindex);
532 if (dev == NULL)
533 goto errout;
534 in6_dev = __in6_dev_get(dev);
535 if (in6_dev == NULL)
536 goto errout;
537 devconf = &in6_dev->cnf;
538 break;
539 }
540
541 err = -ENOBUFS;
542 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
543 if (skb == NULL)
544 goto errout;
545
546 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
547 NETLINK_CB(in_skb).portid,
548 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
549 -1);
550 if (err < 0) {
551 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
552 WARN_ON(err == -EMSGSIZE);
553 kfree_skb(skb);
554 goto errout;
555 }
556 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
557 errout:
558 return err;
559 }
560
561 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
562 struct netlink_callback *cb)
563 {
564 struct net *net = sock_net(skb->sk);
565 int h, s_h;
566 int idx, s_idx;
567 struct net_device *dev;
568 struct inet6_dev *idev;
569 struct hlist_head *head;
570
571 s_h = cb->args[0];
572 s_idx = idx = cb->args[1];
573
574 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
575 idx = 0;
576 head = &net->dev_index_head[h];
577 rcu_read_lock();
578 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
579 net->dev_base_seq;
580 hlist_for_each_entry_rcu(dev, head, index_hlist) {
581 if (idx < s_idx)
582 goto cont;
583 idev = __in6_dev_get(dev);
584 if (!idev)
585 goto cont;
586
587 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
588 &idev->cnf,
589 NETLINK_CB(cb->skb).portid,
590 cb->nlh->nlmsg_seq,
591 RTM_NEWNETCONF,
592 NLM_F_MULTI,
593 -1) <= 0) {
594 rcu_read_unlock();
595 goto done;
596 }
597 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
598 cont:
599 idx++;
600 }
601 rcu_read_unlock();
602 }
603 if (h == NETDEV_HASHENTRIES) {
604 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
605 net->ipv6.devconf_all,
606 NETLINK_CB(cb->skb).portid,
607 cb->nlh->nlmsg_seq,
608 RTM_NEWNETCONF, NLM_F_MULTI,
609 -1) <= 0)
610 goto done;
611 else
612 h++;
613 }
614 if (h == NETDEV_HASHENTRIES + 1) {
615 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
616 net->ipv6.devconf_dflt,
617 NETLINK_CB(cb->skb).portid,
618 cb->nlh->nlmsg_seq,
619 RTM_NEWNETCONF, NLM_F_MULTI,
620 -1) <= 0)
621 goto done;
622 else
623 h++;
624 }
625 done:
626 cb->args[0] = h;
627 cb->args[1] = idx;
628
629 return skb->len;
630 }
631
632 #ifdef CONFIG_SYSCTL
633 static void dev_forward_change(struct inet6_dev *idev)
634 {
635 struct net_device *dev;
636 struct inet6_ifaddr *ifa;
637
638 if (!idev)
639 return;
640 dev = idev->dev;
641 if (idev->cnf.forwarding)
642 dev_disable_lro(dev);
643 if (dev->flags & IFF_MULTICAST) {
644 if (idev->cnf.forwarding) {
645 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
646 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
647 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
648 } else {
649 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
650 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
651 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
652 }
653 }
654
655 list_for_each_entry(ifa, &idev->addr_list, if_list) {
656 if (ifa->flags&IFA_F_TENTATIVE)
657 continue;
658 if (idev->cnf.forwarding)
659 addrconf_join_anycast(ifa);
660 else
661 addrconf_leave_anycast(ifa);
662 }
663 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
664 dev->ifindex, &idev->cnf);
665 }
666
667
668 static void addrconf_forward_change(struct net *net, __s32 newf)
669 {
670 struct net_device *dev;
671 struct inet6_dev *idev;
672
673 for_each_netdev(net, dev) {
674 idev = __in6_dev_get(dev);
675 if (idev) {
676 int changed = (!idev->cnf.forwarding) ^ (!newf);
677 idev->cnf.forwarding = newf;
678 if (changed)
679 dev_forward_change(idev);
680 }
681 }
682 }
683
684 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
685 {
686 struct net *net;
687 int old;
688
689 if (!rtnl_trylock())
690 return restart_syscall();
691
692 net = (struct net *)table->extra2;
693 old = *p;
694 *p = newf;
695
696 if (p == &net->ipv6.devconf_dflt->forwarding) {
697 if ((!newf) ^ (!old))
698 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
699 NETCONFA_IFINDEX_DEFAULT,
700 net->ipv6.devconf_dflt);
701 rtnl_unlock();
702 return 0;
703 }
704
705 if (p == &net->ipv6.devconf_all->forwarding) {
706 net->ipv6.devconf_dflt->forwarding = newf;
707 addrconf_forward_change(net, newf);
708 if ((!newf) ^ (!old))
709 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
710 NETCONFA_IFINDEX_ALL,
711 net->ipv6.devconf_all);
712 } else if ((!newf) ^ (!old))
713 dev_forward_change((struct inet6_dev *)table->extra1);
714 rtnl_unlock();
715
716 if (newf)
717 rt6_purge_dflt_routers(net);
718 return 1;
719 }
720 #endif
721
722 /* Nobody refers to this ifaddr, destroy it */
723 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
724 {
725 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
726
727 #ifdef NET_REFCNT_DEBUG
728 pr_debug("%s\n", __func__);
729 #endif
730
731 in6_dev_put(ifp->idev);
732
733 if (del_timer(&ifp->dad_timer))
734 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
735
736 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
737 pr_warn("Freeing alive inet6 address %p\n", ifp);
738 return;
739 }
740 ip6_rt_put(ifp->rt);
741
742 kfree_rcu(ifp, rcu);
743 }
744
745 static void
746 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
747 {
748 struct list_head *p;
749 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
750
751 /*
752 * Each device address list is sorted in order of scope -
753 * global before linklocal.
754 */
755 list_for_each(p, &idev->addr_list) {
756 struct inet6_ifaddr *ifa
757 = list_entry(p, struct inet6_ifaddr, if_list);
758 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
759 break;
760 }
761
762 list_add_tail(&ifp->if_list, p);
763 }
764
765 static u32 inet6_addr_hash(const struct in6_addr *addr)
766 {
767 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
768 }
769
770 /* On success it returns ifp with increased reference count */
771
772 static struct inet6_ifaddr *
773 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
774 const struct in6_addr *peer_addr, int pfxlen,
775 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
776 {
777 struct inet6_ifaddr *ifa = NULL;
778 struct rt6_info *rt;
779 unsigned int hash;
780 int err = 0;
781 int addr_type = ipv6_addr_type(addr);
782
783 if (addr_type == IPV6_ADDR_ANY ||
784 addr_type & IPV6_ADDR_MULTICAST ||
785 (!(idev->dev->flags & IFF_LOOPBACK) &&
786 addr_type & IPV6_ADDR_LOOPBACK))
787 return ERR_PTR(-EADDRNOTAVAIL);
788
789 rcu_read_lock_bh();
790 if (idev->dead) {
791 err = -ENODEV; /*XXX*/
792 goto out2;
793 }
794
795 if (idev->cnf.disable_ipv6) {
796 err = -EACCES;
797 goto out2;
798 }
799
800 spin_lock(&addrconf_hash_lock);
801
802 /* Ignore adding duplicate addresses on an interface */
803 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
804 ADBG("ipv6_add_addr: already assigned\n");
805 err = -EEXIST;
806 goto out;
807 }
808
809 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
810
811 if (ifa == NULL) {
812 ADBG("ipv6_add_addr: malloc failed\n");
813 err = -ENOBUFS;
814 goto out;
815 }
816
817 rt = addrconf_dst_alloc(idev, addr, false);
818 if (IS_ERR(rt)) {
819 err = PTR_ERR(rt);
820 goto out;
821 }
822
823 ifa->addr = *addr;
824 if (peer_addr)
825 ifa->peer_addr = *peer_addr;
826
827 spin_lock_init(&ifa->lock);
828 spin_lock_init(&ifa->state_lock);
829 setup_timer(&ifa->dad_timer, addrconf_dad_timer,
830 (unsigned long)ifa);
831 INIT_HLIST_NODE(&ifa->addr_lst);
832 ifa->scope = scope;
833 ifa->prefix_len = pfxlen;
834 ifa->flags = flags | IFA_F_TENTATIVE;
835 ifa->valid_lft = valid_lft;
836 ifa->prefered_lft = prefered_lft;
837 ifa->cstamp = ifa->tstamp = jiffies;
838 ifa->tokenized = false;
839
840 ifa->rt = rt;
841
842 ifa->idev = idev;
843 in6_dev_hold(idev);
844 /* For caller */
845 in6_ifa_hold(ifa);
846
847 /* Add to big hash table */
848 hash = inet6_addr_hash(addr);
849
850 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
851 spin_unlock(&addrconf_hash_lock);
852
853 write_lock(&idev->lock);
854 /* Add to inet6_dev unicast addr list. */
855 ipv6_link_dev_addr(idev, ifa);
856
857 if (ifa->flags&IFA_F_TEMPORARY) {
858 list_add(&ifa->tmp_list, &idev->tempaddr_list);
859 in6_ifa_hold(ifa);
860 }
861
862 in6_ifa_hold(ifa);
863 write_unlock(&idev->lock);
864 out2:
865 rcu_read_unlock_bh();
866
867 if (likely(err == 0))
868 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
869 else {
870 kfree(ifa);
871 ifa = ERR_PTR(err);
872 }
873
874 return ifa;
875 out:
876 spin_unlock(&addrconf_hash_lock);
877 goto out2;
878 }
879
880 /* This function wants to get referenced ifp and releases it before return */
881
882 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
883 {
884 struct inet6_ifaddr *ifa, *ifn;
885 struct inet6_dev *idev = ifp->idev;
886 int state;
887 int deleted = 0, onlink = 0;
888 unsigned long expires = jiffies;
889
890 spin_lock_bh(&ifp->state_lock);
891 state = ifp->state;
892 ifp->state = INET6_IFADDR_STATE_DEAD;
893 spin_unlock_bh(&ifp->state_lock);
894
895 if (state == INET6_IFADDR_STATE_DEAD)
896 goto out;
897
898 spin_lock_bh(&addrconf_hash_lock);
899 hlist_del_init_rcu(&ifp->addr_lst);
900 spin_unlock_bh(&addrconf_hash_lock);
901
902 write_lock_bh(&idev->lock);
903
904 if (ifp->flags&IFA_F_TEMPORARY) {
905 list_del(&ifp->tmp_list);
906 if (ifp->ifpub) {
907 in6_ifa_put(ifp->ifpub);
908 ifp->ifpub = NULL;
909 }
910 __in6_ifa_put(ifp);
911 }
912
913 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
914 if (ifa == ifp) {
915 list_del_init(&ifp->if_list);
916 __in6_ifa_put(ifp);
917
918 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
919 break;
920 deleted = 1;
921 continue;
922 } else if (ifp->flags & IFA_F_PERMANENT) {
923 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
924 ifp->prefix_len)) {
925 if (ifa->flags & IFA_F_PERMANENT) {
926 onlink = 1;
927 if (deleted)
928 break;
929 } else {
930 unsigned long lifetime;
931
932 if (!onlink)
933 onlink = -1;
934
935 spin_lock(&ifa->lock);
936
937 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
938 /*
939 * Note: Because this address is
940 * not permanent, lifetime <
941 * LONG_MAX / HZ here.
942 */
943 if (time_before(expires,
944 ifa->tstamp + lifetime * HZ))
945 expires = ifa->tstamp + lifetime * HZ;
946 spin_unlock(&ifa->lock);
947 }
948 }
949 }
950 }
951 write_unlock_bh(&idev->lock);
952
953 addrconf_del_dad_timer(ifp);
954
955 ipv6_ifa_notify(RTM_DELADDR, ifp);
956
957 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
958
959 /*
960 * Purge or update corresponding prefix
961 *
962 * 1) we don't purge prefix here if address was not permanent.
963 * prefix is managed by its own lifetime.
964 * 2) if there're no addresses, delete prefix.
965 * 3) if there're still other permanent address(es),
966 * corresponding prefix is still permanent.
967 * 4) otherwise, update prefix lifetime to the
968 * longest valid lifetime among the corresponding
969 * addresses on the device.
970 * Note: subsequent RA will update lifetime.
971 *
972 * --yoshfuji
973 */
974 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
975 struct in6_addr prefix;
976 struct rt6_info *rt;
977
978 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
979
980 rt = addrconf_get_prefix_route(&prefix,
981 ifp->prefix_len,
982 ifp->idev->dev,
983 0, RTF_GATEWAY | RTF_DEFAULT);
984
985 if (rt) {
986 if (onlink == 0) {
987 ip6_del_rt(rt);
988 rt = NULL;
989 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
990 rt6_set_expires(rt, expires);
991 }
992 }
993 ip6_rt_put(rt);
994 }
995
996 /* clean up prefsrc entries */
997 rt6_remove_prefsrc(ifp);
998 out:
999 in6_ifa_put(ifp);
1000 }
1001
1002 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1003 {
1004 struct inet6_dev *idev = ifp->idev;
1005 struct in6_addr addr, *tmpaddr;
1006 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1007 unsigned long regen_advance;
1008 int tmp_plen;
1009 int ret = 0;
1010 u32 addr_flags;
1011 unsigned long now = jiffies;
1012
1013 write_lock(&idev->lock);
1014 if (ift) {
1015 spin_lock_bh(&ift->lock);
1016 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1017 spin_unlock_bh(&ift->lock);
1018 tmpaddr = &addr;
1019 } else {
1020 tmpaddr = NULL;
1021 }
1022 retry:
1023 in6_dev_hold(idev);
1024 if (idev->cnf.use_tempaddr <= 0) {
1025 write_unlock(&idev->lock);
1026 pr_info("%s: use_tempaddr is disabled\n", __func__);
1027 in6_dev_put(idev);
1028 ret = -1;
1029 goto out;
1030 }
1031 spin_lock_bh(&ifp->lock);
1032 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1033 idev->cnf.use_tempaddr = -1; /*XXX*/
1034 spin_unlock_bh(&ifp->lock);
1035 write_unlock(&idev->lock);
1036 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1037 __func__);
1038 in6_dev_put(idev);
1039 ret = -1;
1040 goto out;
1041 }
1042 in6_ifa_hold(ifp);
1043 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1044 __ipv6_try_regen_rndid(idev, tmpaddr);
1045 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1046 age = (now - ifp->tstamp) / HZ;
1047 tmp_valid_lft = min_t(__u32,
1048 ifp->valid_lft,
1049 idev->cnf.temp_valid_lft + age);
1050 tmp_prefered_lft = min_t(__u32,
1051 ifp->prefered_lft,
1052 idev->cnf.temp_prefered_lft + age -
1053 idev->cnf.max_desync_factor);
1054 tmp_plen = ifp->prefix_len;
1055 tmp_tstamp = ifp->tstamp;
1056 spin_unlock_bh(&ifp->lock);
1057
1058 regen_advance = idev->cnf.regen_max_retry *
1059 idev->cnf.dad_transmits *
1060 idev->nd_parms->retrans_time / HZ;
1061 write_unlock(&idev->lock);
1062
1063 /* A temporary address is created only if this calculated Preferred
1064 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1065 * an implementation must not create a temporary address with a zero
1066 * Preferred Lifetime.
1067 */
1068 if (tmp_prefered_lft <= regen_advance) {
1069 in6_ifa_put(ifp);
1070 in6_dev_put(idev);
1071 ret = -1;
1072 goto out;
1073 }
1074
1075 addr_flags = IFA_F_TEMPORARY;
1076 /* set in addrconf_prefix_rcv() */
1077 if (ifp->flags & IFA_F_OPTIMISTIC)
1078 addr_flags |= IFA_F_OPTIMISTIC;
1079
1080 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1081 ipv6_addr_scope(&addr), addr_flags,
1082 tmp_valid_lft, tmp_prefered_lft);
1083 if (IS_ERR(ift)) {
1084 in6_ifa_put(ifp);
1085 in6_dev_put(idev);
1086 pr_info("%s: retry temporary address regeneration\n", __func__);
1087 tmpaddr = &addr;
1088 write_lock(&idev->lock);
1089 goto retry;
1090 }
1091
1092 spin_lock_bh(&ift->lock);
1093 ift->ifpub = ifp;
1094 ift->cstamp = now;
1095 ift->tstamp = tmp_tstamp;
1096 spin_unlock_bh(&ift->lock);
1097
1098 addrconf_dad_start(ift);
1099 in6_ifa_put(ift);
1100 in6_dev_put(idev);
1101 out:
1102 return ret;
1103 }
1104
1105 /*
1106 * Choose an appropriate source address (RFC3484)
1107 */
1108 enum {
1109 IPV6_SADDR_RULE_INIT = 0,
1110 IPV6_SADDR_RULE_LOCAL,
1111 IPV6_SADDR_RULE_SCOPE,
1112 IPV6_SADDR_RULE_PREFERRED,
1113 #ifdef CONFIG_IPV6_MIP6
1114 IPV6_SADDR_RULE_HOA,
1115 #endif
1116 IPV6_SADDR_RULE_OIF,
1117 IPV6_SADDR_RULE_LABEL,
1118 IPV6_SADDR_RULE_PRIVACY,
1119 IPV6_SADDR_RULE_ORCHID,
1120 IPV6_SADDR_RULE_PREFIX,
1121 IPV6_SADDR_RULE_MAX
1122 };
1123
1124 struct ipv6_saddr_score {
1125 int rule;
1126 int addr_type;
1127 struct inet6_ifaddr *ifa;
1128 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1129 int scopedist;
1130 int matchlen;
1131 };
1132
1133 struct ipv6_saddr_dst {
1134 const struct in6_addr *addr;
1135 int ifindex;
1136 int scope;
1137 int label;
1138 unsigned int prefs;
1139 };
1140
1141 static inline int ipv6_saddr_preferred(int type)
1142 {
1143 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1144 return 1;
1145 return 0;
1146 }
1147
1148 static int ipv6_get_saddr_eval(struct net *net,
1149 struct ipv6_saddr_score *score,
1150 struct ipv6_saddr_dst *dst,
1151 int i)
1152 {
1153 int ret;
1154
1155 if (i <= score->rule) {
1156 switch (i) {
1157 case IPV6_SADDR_RULE_SCOPE:
1158 ret = score->scopedist;
1159 break;
1160 case IPV6_SADDR_RULE_PREFIX:
1161 ret = score->matchlen;
1162 break;
1163 default:
1164 ret = !!test_bit(i, score->scorebits);
1165 }
1166 goto out;
1167 }
1168
1169 switch (i) {
1170 case IPV6_SADDR_RULE_INIT:
1171 /* Rule 0: remember if hiscore is not ready yet */
1172 ret = !!score->ifa;
1173 break;
1174 case IPV6_SADDR_RULE_LOCAL:
1175 /* Rule 1: Prefer same address */
1176 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1177 break;
1178 case IPV6_SADDR_RULE_SCOPE:
1179 /* Rule 2: Prefer appropriate scope
1180 *
1181 * ret
1182 * ^
1183 * -1 | d 15
1184 * ---+--+-+---> scope
1185 * |
1186 * | d is scope of the destination.
1187 * B-d | \
1188 * | \ <- smaller scope is better if
1189 * B-15 | \ if scope is enough for destinaion.
1190 * | ret = B - scope (-1 <= scope >= d <= 15).
1191 * d-C-1 | /
1192 * |/ <- greater is better
1193 * -C / if scope is not enough for destination.
1194 * /| ret = scope - C (-1 <= d < scope <= 15).
1195 *
1196 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1197 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1198 * Assume B = 0 and we get C > 29.
1199 */
1200 ret = __ipv6_addr_src_scope(score->addr_type);
1201 if (ret >= dst->scope)
1202 ret = -ret;
1203 else
1204 ret -= 128; /* 30 is enough */
1205 score->scopedist = ret;
1206 break;
1207 case IPV6_SADDR_RULE_PREFERRED:
1208 /* Rule 3: Avoid deprecated and optimistic addresses */
1209 ret = ipv6_saddr_preferred(score->addr_type) ||
1210 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1211 break;
1212 #ifdef CONFIG_IPV6_MIP6
1213 case IPV6_SADDR_RULE_HOA:
1214 {
1215 /* Rule 4: Prefer home address */
1216 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1217 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1218 break;
1219 }
1220 #endif
1221 case IPV6_SADDR_RULE_OIF:
1222 /* Rule 5: Prefer outgoing interface */
1223 ret = (!dst->ifindex ||
1224 dst->ifindex == score->ifa->idev->dev->ifindex);
1225 break;
1226 case IPV6_SADDR_RULE_LABEL:
1227 /* Rule 6: Prefer matching label */
1228 ret = ipv6_addr_label(net,
1229 &score->ifa->addr, score->addr_type,
1230 score->ifa->idev->dev->ifindex) == dst->label;
1231 break;
1232 case IPV6_SADDR_RULE_PRIVACY:
1233 {
1234 /* Rule 7: Prefer public address
1235 * Note: prefer temporary address if use_tempaddr >= 2
1236 */
1237 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1238 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1239 score->ifa->idev->cnf.use_tempaddr >= 2;
1240 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1241 break;
1242 }
1243 case IPV6_SADDR_RULE_ORCHID:
1244 /* Rule 8-: Prefer ORCHID vs ORCHID or
1245 * non-ORCHID vs non-ORCHID
1246 */
1247 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1248 ipv6_addr_orchid(dst->addr));
1249 break;
1250 case IPV6_SADDR_RULE_PREFIX:
1251 /* Rule 8: Use longest matching prefix */
1252 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1253 if (ret > score->ifa->prefix_len)
1254 ret = score->ifa->prefix_len;
1255 score->matchlen = ret;
1256 break;
1257 default:
1258 ret = 0;
1259 }
1260
1261 if (ret)
1262 __set_bit(i, score->scorebits);
1263 score->rule = i;
1264 out:
1265 return ret;
1266 }
1267
1268 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1269 const struct in6_addr *daddr, unsigned int prefs,
1270 struct in6_addr *saddr)
1271 {
1272 struct ipv6_saddr_score scores[2],
1273 *score = &scores[0], *hiscore = &scores[1];
1274 struct ipv6_saddr_dst dst;
1275 struct net_device *dev;
1276 int dst_type;
1277
1278 dst_type = __ipv6_addr_type(daddr);
1279 dst.addr = daddr;
1280 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1281 dst.scope = __ipv6_addr_src_scope(dst_type);
1282 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1283 dst.prefs = prefs;
1284
1285 hiscore->rule = -1;
1286 hiscore->ifa = NULL;
1287
1288 rcu_read_lock();
1289
1290 for_each_netdev_rcu(net, dev) {
1291 struct inet6_dev *idev;
1292
1293 /* Candidate Source Address (section 4)
1294 * - multicast and link-local destination address,
1295 * the set of candidate source address MUST only
1296 * include addresses assigned to interfaces
1297 * belonging to the same link as the outgoing
1298 * interface.
1299 * (- For site-local destination addresses, the
1300 * set of candidate source addresses MUST only
1301 * include addresses assigned to interfaces
1302 * belonging to the same site as the outgoing
1303 * interface.)
1304 */
1305 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1306 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1307 dst.ifindex && dev->ifindex != dst.ifindex)
1308 continue;
1309
1310 idev = __in6_dev_get(dev);
1311 if (!idev)
1312 continue;
1313
1314 read_lock_bh(&idev->lock);
1315 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1316 int i;
1317
1318 /*
1319 * - Tentative Address (RFC2462 section 5.4)
1320 * - A tentative address is not considered
1321 * "assigned to an interface" in the traditional
1322 * sense, unless it is also flagged as optimistic.
1323 * - Candidate Source Address (section 4)
1324 * - In any case, anycast addresses, multicast
1325 * addresses, and the unspecified address MUST
1326 * NOT be included in a candidate set.
1327 */
1328 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1329 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1330 continue;
1331
1332 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1333
1334 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1335 score->addr_type & IPV6_ADDR_MULTICAST)) {
1336 LIMIT_NETDEBUG(KERN_DEBUG
1337 "ADDRCONF: unspecified / multicast address "
1338 "assigned as unicast address on %s",
1339 dev->name);
1340 continue;
1341 }
1342
1343 score->rule = -1;
1344 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1345
1346 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1347 int minihiscore, miniscore;
1348
1349 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1350 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1351
1352 if (minihiscore > miniscore) {
1353 if (i == IPV6_SADDR_RULE_SCOPE &&
1354 score->scopedist > 0) {
1355 /*
1356 * special case:
1357 * each remaining entry
1358 * has too small (not enough)
1359 * scope, because ifa entries
1360 * are sorted by their scope
1361 * values.
1362 */
1363 goto try_nextdev;
1364 }
1365 break;
1366 } else if (minihiscore < miniscore) {
1367 if (hiscore->ifa)
1368 in6_ifa_put(hiscore->ifa);
1369
1370 in6_ifa_hold(score->ifa);
1371
1372 swap(hiscore, score);
1373
1374 /* restore our iterator */
1375 score->ifa = hiscore->ifa;
1376
1377 break;
1378 }
1379 }
1380 }
1381 try_nextdev:
1382 read_unlock_bh(&idev->lock);
1383 }
1384 rcu_read_unlock();
1385
1386 if (!hiscore->ifa)
1387 return -EADDRNOTAVAIL;
1388
1389 *saddr = hiscore->ifa->addr;
1390 in6_ifa_put(hiscore->ifa);
1391 return 0;
1392 }
1393 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1394
1395 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1396 unsigned char banned_flags)
1397 {
1398 struct inet6_ifaddr *ifp;
1399 int err = -EADDRNOTAVAIL;
1400
1401 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1402 if (ifp->scope == IFA_LINK &&
1403 !(ifp->flags & banned_flags)) {
1404 *addr = ifp->addr;
1405 err = 0;
1406 break;
1407 }
1408 }
1409 return err;
1410 }
1411
1412 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1413 unsigned char banned_flags)
1414 {
1415 struct inet6_dev *idev;
1416 int err = -EADDRNOTAVAIL;
1417
1418 rcu_read_lock();
1419 idev = __in6_dev_get(dev);
1420 if (idev) {
1421 read_lock_bh(&idev->lock);
1422 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1423 read_unlock_bh(&idev->lock);
1424 }
1425 rcu_read_unlock();
1426 return err;
1427 }
1428
1429 static int ipv6_count_addresses(struct inet6_dev *idev)
1430 {
1431 int cnt = 0;
1432 struct inet6_ifaddr *ifp;
1433
1434 read_lock_bh(&idev->lock);
1435 list_for_each_entry(ifp, &idev->addr_list, if_list)
1436 cnt++;
1437 read_unlock_bh(&idev->lock);
1438 return cnt;
1439 }
1440
1441 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1442 const struct net_device *dev, int strict)
1443 {
1444 struct inet6_ifaddr *ifp;
1445 unsigned int hash = inet6_addr_hash(addr);
1446
1447 rcu_read_lock_bh();
1448 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1449 if (!net_eq(dev_net(ifp->idev->dev), net))
1450 continue;
1451 if (ipv6_addr_equal(&ifp->addr, addr) &&
1452 !(ifp->flags&IFA_F_TENTATIVE) &&
1453 (dev == NULL || ifp->idev->dev == dev ||
1454 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1455 rcu_read_unlock_bh();
1456 return 1;
1457 }
1458 }
1459
1460 rcu_read_unlock_bh();
1461 return 0;
1462 }
1463 EXPORT_SYMBOL(ipv6_chk_addr);
1464
1465 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1466 struct net_device *dev)
1467 {
1468 unsigned int hash = inet6_addr_hash(addr);
1469 struct inet6_ifaddr *ifp;
1470
1471 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1472 if (!net_eq(dev_net(ifp->idev->dev), net))
1473 continue;
1474 if (ipv6_addr_equal(&ifp->addr, addr)) {
1475 if (dev == NULL || ifp->idev->dev == dev)
1476 return true;
1477 }
1478 }
1479 return false;
1480 }
1481
1482 /* Compares an address/prefix_len with addresses on device @dev.
1483 * If one is found it returns true.
1484 */
1485 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1486 const unsigned int prefix_len, struct net_device *dev)
1487 {
1488 struct inet6_dev *idev;
1489 struct inet6_ifaddr *ifa;
1490 bool ret = false;
1491
1492 rcu_read_lock();
1493 idev = __in6_dev_get(dev);
1494 if (idev) {
1495 read_lock_bh(&idev->lock);
1496 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1497 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1498 if (ret)
1499 break;
1500 }
1501 read_unlock_bh(&idev->lock);
1502 }
1503 rcu_read_unlock();
1504
1505 return ret;
1506 }
1507 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1508
1509 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1510 {
1511 struct inet6_dev *idev;
1512 struct inet6_ifaddr *ifa;
1513 int onlink;
1514
1515 onlink = 0;
1516 rcu_read_lock();
1517 idev = __in6_dev_get(dev);
1518 if (idev) {
1519 read_lock_bh(&idev->lock);
1520 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1521 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1522 ifa->prefix_len);
1523 if (onlink)
1524 break;
1525 }
1526 read_unlock_bh(&idev->lock);
1527 }
1528 rcu_read_unlock();
1529 return onlink;
1530 }
1531 EXPORT_SYMBOL(ipv6_chk_prefix);
1532
1533 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1534 struct net_device *dev, int strict)
1535 {
1536 struct inet6_ifaddr *ifp, *result = NULL;
1537 unsigned int hash = inet6_addr_hash(addr);
1538
1539 rcu_read_lock_bh();
1540 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1541 if (!net_eq(dev_net(ifp->idev->dev), net))
1542 continue;
1543 if (ipv6_addr_equal(&ifp->addr, addr)) {
1544 if (dev == NULL || ifp->idev->dev == dev ||
1545 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1546 result = ifp;
1547 in6_ifa_hold(ifp);
1548 break;
1549 }
1550 }
1551 }
1552 rcu_read_unlock_bh();
1553
1554 return result;
1555 }
1556
1557 /* Gets referenced address, destroys ifaddr */
1558
1559 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1560 {
1561 if (ifp->flags&IFA_F_PERMANENT) {
1562 spin_lock_bh(&ifp->lock);
1563 addrconf_del_dad_timer(ifp);
1564 ifp->flags |= IFA_F_TENTATIVE;
1565 if (dad_failed)
1566 ifp->flags |= IFA_F_DADFAILED;
1567 spin_unlock_bh(&ifp->lock);
1568 if (dad_failed)
1569 ipv6_ifa_notify(0, ifp);
1570 in6_ifa_put(ifp);
1571 } else if (ifp->flags&IFA_F_TEMPORARY) {
1572 struct inet6_ifaddr *ifpub;
1573 spin_lock_bh(&ifp->lock);
1574 ifpub = ifp->ifpub;
1575 if (ifpub) {
1576 in6_ifa_hold(ifpub);
1577 spin_unlock_bh(&ifp->lock);
1578 ipv6_create_tempaddr(ifpub, ifp);
1579 in6_ifa_put(ifpub);
1580 } else {
1581 spin_unlock_bh(&ifp->lock);
1582 }
1583 ipv6_del_addr(ifp);
1584 } else
1585 ipv6_del_addr(ifp);
1586 }
1587
1588 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1589 {
1590 int err = -ENOENT;
1591
1592 spin_lock(&ifp->state_lock);
1593 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1594 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1595 err = 0;
1596 }
1597 spin_unlock(&ifp->state_lock);
1598
1599 return err;
1600 }
1601
1602 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1603 {
1604 struct inet6_dev *idev = ifp->idev;
1605
1606 if (addrconf_dad_end(ifp)) {
1607 in6_ifa_put(ifp);
1608 return;
1609 }
1610
1611 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1612 ifp->idev->dev->name, &ifp->addr);
1613
1614 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1615 struct in6_addr addr;
1616
1617 addr.s6_addr32[0] = htonl(0xfe800000);
1618 addr.s6_addr32[1] = 0;
1619
1620 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1621 ipv6_addr_equal(&ifp->addr, &addr)) {
1622 /* DAD failed for link-local based on MAC address */
1623 idev->cnf.disable_ipv6 = 1;
1624
1625 pr_info("%s: IPv6 being disabled!\n",
1626 ifp->idev->dev->name);
1627 }
1628 }
1629
1630 addrconf_dad_stop(ifp, 1);
1631 }
1632
1633 /* Join to solicited addr multicast group. */
1634
1635 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1636 {
1637 struct in6_addr maddr;
1638
1639 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1640 return;
1641
1642 addrconf_addr_solict_mult(addr, &maddr);
1643 ipv6_dev_mc_inc(dev, &maddr);
1644 }
1645
1646 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1647 {
1648 struct in6_addr maddr;
1649
1650 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1651 return;
1652
1653 addrconf_addr_solict_mult(addr, &maddr);
1654 __ipv6_dev_mc_dec(idev, &maddr);
1655 }
1656
1657 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1658 {
1659 struct in6_addr addr;
1660 if (ifp->prefix_len == 127) /* RFC 6164 */
1661 return;
1662 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1663 if (ipv6_addr_any(&addr))
1664 return;
1665 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1666 }
1667
1668 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1669 {
1670 struct in6_addr addr;
1671 if (ifp->prefix_len == 127) /* RFC 6164 */
1672 return;
1673 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1674 if (ipv6_addr_any(&addr))
1675 return;
1676 __ipv6_dev_ac_dec(ifp->idev, &addr);
1677 }
1678
1679 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1680 {
1681 if (dev->addr_len != ETH_ALEN)
1682 return -1;
1683 memcpy(eui, dev->dev_addr, 3);
1684 memcpy(eui + 5, dev->dev_addr + 3, 3);
1685
1686 /*
1687 * The zSeries OSA network cards can be shared among various
1688 * OS instances, but the OSA cards have only one MAC address.
1689 * This leads to duplicate address conflicts in conjunction
1690 * with IPv6 if more than one instance uses the same card.
1691 *
1692 * The driver for these cards can deliver a unique 16-bit
1693 * identifier for each instance sharing the same card. It is
1694 * placed instead of 0xFFFE in the interface identifier. The
1695 * "u" bit of the interface identifier is not inverted in this
1696 * case. Hence the resulting interface identifier has local
1697 * scope according to RFC2373.
1698 */
1699 if (dev->dev_id) {
1700 eui[3] = (dev->dev_id >> 8) & 0xFF;
1701 eui[4] = dev->dev_id & 0xFF;
1702 } else {
1703 eui[3] = 0xFF;
1704 eui[4] = 0xFE;
1705 eui[0] ^= 2;
1706 }
1707 return 0;
1708 }
1709
1710 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1711 {
1712 if (dev->addr_len != IEEE802154_ADDR_LEN)
1713 return -1;
1714 memcpy(eui, dev->dev_addr, 8);
1715 eui[0] ^= 2;
1716 return 0;
1717 }
1718
1719 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1720 {
1721 union fwnet_hwaddr *ha;
1722
1723 if (dev->addr_len != FWNET_ALEN)
1724 return -1;
1725
1726 ha = (union fwnet_hwaddr *)dev->dev_addr;
1727
1728 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1729 eui[0] ^= 2;
1730 return 0;
1731 }
1732
1733 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1734 {
1735 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1736 if (dev->addr_len != ARCNET_ALEN)
1737 return -1;
1738 memset(eui, 0, 7);
1739 eui[7] = *(u8 *)dev->dev_addr;
1740 return 0;
1741 }
1742
1743 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1744 {
1745 if (dev->addr_len != INFINIBAND_ALEN)
1746 return -1;
1747 memcpy(eui, dev->dev_addr + 12, 8);
1748 eui[0] |= 2;
1749 return 0;
1750 }
1751
1752 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1753 {
1754 if (addr == 0)
1755 return -1;
1756 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1757 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1758 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1759 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1760 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1761 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1762 eui[1] = 0;
1763 eui[2] = 0x5E;
1764 eui[3] = 0xFE;
1765 memcpy(eui + 4, &addr, 4);
1766 return 0;
1767 }
1768
1769 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1770 {
1771 if (dev->priv_flags & IFF_ISATAP)
1772 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1773 return -1;
1774 }
1775
1776 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1777 {
1778 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1779 }
1780
1781 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1782 {
1783 memcpy(eui, dev->perm_addr, 3);
1784 memcpy(eui + 5, dev->perm_addr + 3, 3);
1785 eui[3] = 0xFF;
1786 eui[4] = 0xFE;
1787 eui[0] ^= 2;
1788 return 0;
1789 }
1790
1791 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1792 {
1793 switch (dev->type) {
1794 case ARPHRD_ETHER:
1795 case ARPHRD_FDDI:
1796 return addrconf_ifid_eui48(eui, dev);
1797 case ARPHRD_ARCNET:
1798 return addrconf_ifid_arcnet(eui, dev);
1799 case ARPHRD_INFINIBAND:
1800 return addrconf_ifid_infiniband(eui, dev);
1801 case ARPHRD_SIT:
1802 return addrconf_ifid_sit(eui, dev);
1803 case ARPHRD_IPGRE:
1804 return addrconf_ifid_gre(eui, dev);
1805 case ARPHRD_IEEE802154:
1806 return addrconf_ifid_eui64(eui, dev);
1807 case ARPHRD_IEEE1394:
1808 return addrconf_ifid_ieee1394(eui, dev);
1809 case ARPHRD_TUNNEL6:
1810 return addrconf_ifid_ip6tnl(eui, dev);
1811 }
1812 return -1;
1813 }
1814
1815 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1816 {
1817 int err = -1;
1818 struct inet6_ifaddr *ifp;
1819
1820 read_lock_bh(&idev->lock);
1821 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1822 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1823 memcpy(eui, ifp->addr.s6_addr+8, 8);
1824 err = 0;
1825 break;
1826 }
1827 }
1828 read_unlock_bh(&idev->lock);
1829 return err;
1830 }
1831
1832 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1833 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1834 {
1835 regen:
1836 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1837 idev->rndid[0] &= ~0x02;
1838
1839 /*
1840 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1841 * check if generated address is not inappropriate
1842 *
1843 * - Reserved subnet anycast (RFC 2526)
1844 * 11111101 11....11 1xxxxxxx
1845 * - ISATAP (RFC4214) 6.1
1846 * 00-00-5E-FE-xx-xx-xx-xx
1847 * - value 0
1848 * - XXX: already assigned to an address on the device
1849 */
1850 if (idev->rndid[0] == 0xfd &&
1851 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1852 (idev->rndid[7]&0x80))
1853 goto regen;
1854 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1855 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1856 goto regen;
1857 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1858 goto regen;
1859 }
1860 }
1861
1862 static void ipv6_regen_rndid(unsigned long data)
1863 {
1864 struct inet6_dev *idev = (struct inet6_dev *) data;
1865 unsigned long expires;
1866
1867 rcu_read_lock_bh();
1868 write_lock_bh(&idev->lock);
1869
1870 if (idev->dead)
1871 goto out;
1872
1873 __ipv6_regen_rndid(idev);
1874
1875 expires = jiffies +
1876 idev->cnf.temp_prefered_lft * HZ -
1877 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1878 idev->cnf.max_desync_factor * HZ;
1879 if (time_before(expires, jiffies)) {
1880 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1881 __func__, idev->dev->name);
1882 goto out;
1883 }
1884
1885 if (!mod_timer(&idev->regen_timer, expires))
1886 in6_dev_hold(idev);
1887
1888 out:
1889 write_unlock_bh(&idev->lock);
1890 rcu_read_unlock_bh();
1891 in6_dev_put(idev);
1892 }
1893
1894 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1895 {
1896 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1897 __ipv6_regen_rndid(idev);
1898 }
1899
1900 /*
1901 * Add prefix route.
1902 */
1903
1904 static void
1905 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1906 unsigned long expires, u32 flags)
1907 {
1908 struct fib6_config cfg = {
1909 .fc_table = RT6_TABLE_PREFIX,
1910 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1911 .fc_ifindex = dev->ifindex,
1912 .fc_expires = expires,
1913 .fc_dst_len = plen,
1914 .fc_flags = RTF_UP | flags,
1915 .fc_nlinfo.nl_net = dev_net(dev),
1916 .fc_protocol = RTPROT_KERNEL,
1917 };
1918
1919 cfg.fc_dst = *pfx;
1920
1921 /* Prevent useless cloning on PtP SIT.
1922 This thing is done here expecting that the whole
1923 class of non-broadcast devices need not cloning.
1924 */
1925 #if IS_ENABLED(CONFIG_IPV6_SIT)
1926 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1927 cfg.fc_flags |= RTF_NONEXTHOP;
1928 #endif
1929
1930 ip6_route_add(&cfg);
1931 }
1932
1933
1934 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1935 int plen,
1936 const struct net_device *dev,
1937 u32 flags, u32 noflags)
1938 {
1939 struct fib6_node *fn;
1940 struct rt6_info *rt = NULL;
1941 struct fib6_table *table;
1942
1943 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1944 if (table == NULL)
1945 return NULL;
1946
1947 read_lock_bh(&table->tb6_lock);
1948 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1949 if (!fn)
1950 goto out;
1951 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1952 if (rt->dst.dev->ifindex != dev->ifindex)
1953 continue;
1954 if ((rt->rt6i_flags & flags) != flags)
1955 continue;
1956 if ((rt->rt6i_flags & noflags) != 0)
1957 continue;
1958 dst_hold(&rt->dst);
1959 break;
1960 }
1961 out:
1962 read_unlock_bh(&table->tb6_lock);
1963 return rt;
1964 }
1965
1966
1967 /* Create "default" multicast route to the interface */
1968
1969 static void addrconf_add_mroute(struct net_device *dev)
1970 {
1971 struct fib6_config cfg = {
1972 .fc_table = RT6_TABLE_LOCAL,
1973 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1974 .fc_ifindex = dev->ifindex,
1975 .fc_dst_len = 8,
1976 .fc_flags = RTF_UP,
1977 .fc_nlinfo.nl_net = dev_net(dev),
1978 };
1979
1980 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1981
1982 ip6_route_add(&cfg);
1983 }
1984
1985 #if IS_ENABLED(CONFIG_IPV6_SIT)
1986 static void sit_route_add(struct net_device *dev)
1987 {
1988 struct fib6_config cfg = {
1989 .fc_table = RT6_TABLE_MAIN,
1990 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1991 .fc_ifindex = dev->ifindex,
1992 .fc_dst_len = 96,
1993 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1994 .fc_nlinfo.nl_net = dev_net(dev),
1995 };
1996
1997 /* prefix length - 96 bits "::d.d.d.d" */
1998 ip6_route_add(&cfg);
1999 }
2000 #endif
2001
2002 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2003 {
2004 struct inet6_dev *idev;
2005
2006 ASSERT_RTNL();
2007
2008 idev = ipv6_find_idev(dev);
2009 if (!idev)
2010 return ERR_PTR(-ENOBUFS);
2011
2012 if (idev->cnf.disable_ipv6)
2013 return ERR_PTR(-EACCES);
2014
2015 /* Add default multicast route */
2016 if (!(dev->flags & IFF_LOOPBACK))
2017 addrconf_add_mroute(dev);
2018
2019 return idev;
2020 }
2021
2022 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2023 {
2024 struct prefix_info *pinfo;
2025 __u32 valid_lft;
2026 __u32 prefered_lft;
2027 int addr_type;
2028 struct inet6_dev *in6_dev;
2029 struct net *net = dev_net(dev);
2030
2031 pinfo = (struct prefix_info *) opt;
2032
2033 if (len < sizeof(struct prefix_info)) {
2034 ADBG("addrconf: prefix option too short\n");
2035 return;
2036 }
2037
2038 /*
2039 * Validation checks ([ADDRCONF], page 19)
2040 */
2041
2042 addr_type = ipv6_addr_type(&pinfo->prefix);
2043
2044 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2045 return;
2046
2047 valid_lft = ntohl(pinfo->valid);
2048 prefered_lft = ntohl(pinfo->prefered);
2049
2050 if (prefered_lft > valid_lft) {
2051 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2052 return;
2053 }
2054
2055 in6_dev = in6_dev_get(dev);
2056
2057 if (in6_dev == NULL) {
2058 net_dbg_ratelimited("addrconf: device %s not configured\n",
2059 dev->name);
2060 return;
2061 }
2062
2063 /*
2064 * Two things going on here:
2065 * 1) Add routes for on-link prefixes
2066 * 2) Configure prefixes with the auto flag set
2067 */
2068
2069 if (pinfo->onlink) {
2070 struct rt6_info *rt;
2071 unsigned long rt_expires;
2072
2073 /* Avoid arithmetic overflow. Really, we could
2074 * save rt_expires in seconds, likely valid_lft,
2075 * but it would require division in fib gc, that it
2076 * not good.
2077 */
2078 if (HZ > USER_HZ)
2079 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2080 else
2081 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2082
2083 if (addrconf_finite_timeout(rt_expires))
2084 rt_expires *= HZ;
2085
2086 rt = addrconf_get_prefix_route(&pinfo->prefix,
2087 pinfo->prefix_len,
2088 dev,
2089 RTF_ADDRCONF | RTF_PREFIX_RT,
2090 RTF_GATEWAY | RTF_DEFAULT);
2091
2092 if (rt) {
2093 /* Autoconf prefix route */
2094 if (valid_lft == 0) {
2095 ip6_del_rt(rt);
2096 rt = NULL;
2097 } else if (addrconf_finite_timeout(rt_expires)) {
2098 /* not infinity */
2099 rt6_set_expires(rt, jiffies + rt_expires);
2100 } else {
2101 rt6_clean_expires(rt);
2102 }
2103 } else if (valid_lft) {
2104 clock_t expires = 0;
2105 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2106 if (addrconf_finite_timeout(rt_expires)) {
2107 /* not infinity */
2108 flags |= RTF_EXPIRES;
2109 expires = jiffies_to_clock_t(rt_expires);
2110 }
2111 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2112 dev, expires, flags);
2113 }
2114 ip6_rt_put(rt);
2115 }
2116
2117 /* Try to figure out our local address for this prefix */
2118
2119 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2120 struct inet6_ifaddr *ifp;
2121 struct in6_addr addr;
2122 int create = 0, update_lft = 0;
2123 bool tokenized = false;
2124
2125 if (pinfo->prefix_len == 64) {
2126 memcpy(&addr, &pinfo->prefix, 8);
2127
2128 if (!ipv6_addr_any(&in6_dev->token)) {
2129 read_lock_bh(&in6_dev->lock);
2130 memcpy(addr.s6_addr + 8,
2131 in6_dev->token.s6_addr + 8, 8);
2132 read_unlock_bh(&in6_dev->lock);
2133 tokenized = true;
2134 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2135 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2136 in6_dev_put(in6_dev);
2137 return;
2138 }
2139 goto ok;
2140 }
2141 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2142 pinfo->prefix_len);
2143 in6_dev_put(in6_dev);
2144 return;
2145
2146 ok:
2147
2148 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2149
2150 if (ifp == NULL && valid_lft) {
2151 int max_addresses = in6_dev->cnf.max_addresses;
2152 u32 addr_flags = 0;
2153
2154 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2155 if (in6_dev->cnf.optimistic_dad &&
2156 !net->ipv6.devconf_all->forwarding && sllao)
2157 addr_flags = IFA_F_OPTIMISTIC;
2158 #endif
2159
2160 /* Do not allow to create too much of autoconfigured
2161 * addresses; this would be too easy way to crash kernel.
2162 */
2163 if (!max_addresses ||
2164 ipv6_count_addresses(in6_dev) < max_addresses)
2165 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2166 pinfo->prefix_len,
2167 addr_type&IPV6_ADDR_SCOPE_MASK,
2168 addr_flags, valid_lft,
2169 prefered_lft);
2170
2171 if (IS_ERR_OR_NULL(ifp)) {
2172 in6_dev_put(in6_dev);
2173 return;
2174 }
2175
2176 update_lft = 0;
2177 create = 1;
2178 ifp->cstamp = jiffies;
2179 ifp->tokenized = tokenized;
2180 addrconf_dad_start(ifp);
2181 }
2182
2183 if (ifp) {
2184 int flags;
2185 unsigned long now;
2186 struct inet6_ifaddr *ift;
2187 u32 stored_lft;
2188
2189 /* update lifetime (RFC2462 5.5.3 e) */
2190 spin_lock(&ifp->lock);
2191 now = jiffies;
2192 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2193 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2194 else
2195 stored_lft = 0;
2196 if (!update_lft && !create && stored_lft) {
2197 const u32 minimum_lft = min(
2198 stored_lft, (u32)MIN_VALID_LIFETIME);
2199 valid_lft = max(valid_lft, minimum_lft);
2200
2201 /* RFC4862 Section 5.5.3e:
2202 * "Note that the preferred lifetime of the
2203 * corresponding address is always reset to
2204 * the Preferred Lifetime in the received
2205 * Prefix Information option, regardless of
2206 * whether the valid lifetime is also reset or
2207 * ignored."
2208 *
2209 * So we should always update prefered_lft here.
2210 */
2211 update_lft = 1;
2212 }
2213
2214 if (update_lft) {
2215 ifp->valid_lft = valid_lft;
2216 ifp->prefered_lft = prefered_lft;
2217 ifp->tstamp = now;
2218 flags = ifp->flags;
2219 ifp->flags &= ~IFA_F_DEPRECATED;
2220 spin_unlock(&ifp->lock);
2221
2222 if (!(flags&IFA_F_TENTATIVE))
2223 ipv6_ifa_notify(0, ifp);
2224 } else
2225 spin_unlock(&ifp->lock);
2226
2227 read_lock_bh(&in6_dev->lock);
2228 /* update all temporary addresses in the list */
2229 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2230 tmp_list) {
2231 int age, max_valid, max_prefered;
2232
2233 if (ifp != ift->ifpub)
2234 continue;
2235
2236 /*
2237 * RFC 4941 section 3.3:
2238 * If a received option will extend the lifetime
2239 * of a public address, the lifetimes of
2240 * temporary addresses should be extended,
2241 * subject to the overall constraint that no
2242 * temporary addresses should ever remain
2243 * "valid" or "preferred" for a time longer than
2244 * (TEMP_VALID_LIFETIME) or
2245 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2246 * respectively.
2247 */
2248 age = (now - ift->cstamp) / HZ;
2249 max_valid = in6_dev->cnf.temp_valid_lft - age;
2250 if (max_valid < 0)
2251 max_valid = 0;
2252
2253 max_prefered = in6_dev->cnf.temp_prefered_lft -
2254 in6_dev->cnf.max_desync_factor -
2255 age;
2256 if (max_prefered < 0)
2257 max_prefered = 0;
2258
2259 if (valid_lft > max_valid)
2260 valid_lft = max_valid;
2261
2262 if (prefered_lft > max_prefered)
2263 prefered_lft = max_prefered;
2264
2265 spin_lock(&ift->lock);
2266 flags = ift->flags;
2267 ift->valid_lft = valid_lft;
2268 ift->prefered_lft = prefered_lft;
2269 ift->tstamp = now;
2270 if (prefered_lft > 0)
2271 ift->flags &= ~IFA_F_DEPRECATED;
2272
2273 spin_unlock(&ift->lock);
2274 if (!(flags&IFA_F_TENTATIVE))
2275 ipv6_ifa_notify(0, ift);
2276 }
2277
2278 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2279 /*
2280 * When a new public address is created as
2281 * described in [ADDRCONF], also create a new
2282 * temporary address. Also create a temporary
2283 * address if it's enabled but no temporary
2284 * address currently exists.
2285 */
2286 read_unlock_bh(&in6_dev->lock);
2287 ipv6_create_tempaddr(ifp, NULL);
2288 } else {
2289 read_unlock_bh(&in6_dev->lock);
2290 }
2291
2292 in6_ifa_put(ifp);
2293 addrconf_verify(0);
2294 }
2295 }
2296 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2297 in6_dev_put(in6_dev);
2298 }
2299
2300 /*
2301 * Set destination address.
2302 * Special case for SIT interfaces where we create a new "virtual"
2303 * device.
2304 */
2305 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2306 {
2307 struct in6_ifreq ireq;
2308 struct net_device *dev;
2309 int err = -EINVAL;
2310
2311 rtnl_lock();
2312
2313 err = -EFAULT;
2314 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2315 goto err_exit;
2316
2317 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2318
2319 err = -ENODEV;
2320 if (dev == NULL)
2321 goto err_exit;
2322
2323 #if IS_ENABLED(CONFIG_IPV6_SIT)
2324 if (dev->type == ARPHRD_SIT) {
2325 const struct net_device_ops *ops = dev->netdev_ops;
2326 struct ifreq ifr;
2327 struct ip_tunnel_parm p;
2328
2329 err = -EADDRNOTAVAIL;
2330 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2331 goto err_exit;
2332
2333 memset(&p, 0, sizeof(p));
2334 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2335 p.iph.saddr = 0;
2336 p.iph.version = 4;
2337 p.iph.ihl = 5;
2338 p.iph.protocol = IPPROTO_IPV6;
2339 p.iph.ttl = 64;
2340 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2341
2342 if (ops->ndo_do_ioctl) {
2343 mm_segment_t oldfs = get_fs();
2344
2345 set_fs(KERNEL_DS);
2346 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2347 set_fs(oldfs);
2348 } else
2349 err = -EOPNOTSUPP;
2350
2351 if (err == 0) {
2352 err = -ENOBUFS;
2353 dev = __dev_get_by_name(net, p.name);
2354 if (!dev)
2355 goto err_exit;
2356 err = dev_open(dev);
2357 }
2358 }
2359 #endif
2360
2361 err_exit:
2362 rtnl_unlock();
2363 return err;
2364 }
2365
2366 /*
2367 * Manual configuration of address on an interface
2368 */
2369 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2370 const struct in6_addr *peer_pfx,
2371 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2372 __u32 valid_lft)
2373 {
2374 struct inet6_ifaddr *ifp;
2375 struct inet6_dev *idev;
2376 struct net_device *dev;
2377 int scope;
2378 u32 flags;
2379 clock_t expires;
2380 unsigned long timeout;
2381
2382 ASSERT_RTNL();
2383
2384 if (plen > 128)
2385 return -EINVAL;
2386
2387 /* check the lifetime */
2388 if (!valid_lft || prefered_lft > valid_lft)
2389 return -EINVAL;
2390
2391 dev = __dev_get_by_index(net, ifindex);
2392 if (!dev)
2393 return -ENODEV;
2394
2395 idev = addrconf_add_dev(dev);
2396 if (IS_ERR(idev))
2397 return PTR_ERR(idev);
2398
2399 scope = ipv6_addr_scope(pfx);
2400
2401 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2402 if (addrconf_finite_timeout(timeout)) {
2403 expires = jiffies_to_clock_t(timeout * HZ);
2404 valid_lft = timeout;
2405 flags = RTF_EXPIRES;
2406 } else {
2407 expires = 0;
2408 flags = 0;
2409 ifa_flags |= IFA_F_PERMANENT;
2410 }
2411
2412 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2413 if (addrconf_finite_timeout(timeout)) {
2414 if (timeout == 0)
2415 ifa_flags |= IFA_F_DEPRECATED;
2416 prefered_lft = timeout;
2417 }
2418
2419 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2420 valid_lft, prefered_lft);
2421
2422 if (!IS_ERR(ifp)) {
2423 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2424 expires, flags);
2425 /*
2426 * Note that section 3.1 of RFC 4429 indicates
2427 * that the Optimistic flag should not be set for
2428 * manually configured addresses
2429 */
2430 addrconf_dad_start(ifp);
2431 in6_ifa_put(ifp);
2432 addrconf_verify(0);
2433 return 0;
2434 }
2435
2436 return PTR_ERR(ifp);
2437 }
2438
2439 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2440 unsigned int plen)
2441 {
2442 struct inet6_ifaddr *ifp;
2443 struct inet6_dev *idev;
2444 struct net_device *dev;
2445
2446 if (plen > 128)
2447 return -EINVAL;
2448
2449 dev = __dev_get_by_index(net, ifindex);
2450 if (!dev)
2451 return -ENODEV;
2452
2453 if ((idev = __in6_dev_get(dev)) == NULL)
2454 return -ENXIO;
2455
2456 read_lock_bh(&idev->lock);
2457 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2458 if (ifp->prefix_len == plen &&
2459 ipv6_addr_equal(pfx, &ifp->addr)) {
2460 in6_ifa_hold(ifp);
2461 read_unlock_bh(&idev->lock);
2462
2463 ipv6_del_addr(ifp);
2464 return 0;
2465 }
2466 }
2467 read_unlock_bh(&idev->lock);
2468 return -EADDRNOTAVAIL;
2469 }
2470
2471
2472 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2473 {
2474 struct in6_ifreq ireq;
2475 int err;
2476
2477 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2478 return -EPERM;
2479
2480 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2481 return -EFAULT;
2482
2483 rtnl_lock();
2484 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2485 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2486 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2487 rtnl_unlock();
2488 return err;
2489 }
2490
2491 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2492 {
2493 struct in6_ifreq ireq;
2494 int err;
2495
2496 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2497 return -EPERM;
2498
2499 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2500 return -EFAULT;
2501
2502 rtnl_lock();
2503 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2504 ireq.ifr6_prefixlen);
2505 rtnl_unlock();
2506 return err;
2507 }
2508
2509 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2510 int plen, int scope)
2511 {
2512 struct inet6_ifaddr *ifp;
2513
2514 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2515 scope, IFA_F_PERMANENT, 0, 0);
2516 if (!IS_ERR(ifp)) {
2517 spin_lock_bh(&ifp->lock);
2518 ifp->flags &= ~IFA_F_TENTATIVE;
2519 spin_unlock_bh(&ifp->lock);
2520 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2521 in6_ifa_put(ifp);
2522 }
2523 }
2524
2525 #if IS_ENABLED(CONFIG_IPV6_SIT)
2526 static void sit_add_v4_addrs(struct inet6_dev *idev)
2527 {
2528 struct in6_addr addr;
2529 struct net_device *dev;
2530 struct net *net = dev_net(idev->dev);
2531 int scope;
2532
2533 ASSERT_RTNL();
2534
2535 memset(&addr, 0, sizeof(struct in6_addr));
2536 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2537
2538 if (idev->dev->flags&IFF_POINTOPOINT) {
2539 addr.s6_addr32[0] = htonl(0xfe800000);
2540 scope = IFA_LINK;
2541 } else {
2542 scope = IPV6_ADDR_COMPATv4;
2543 }
2544
2545 if (addr.s6_addr32[3]) {
2546 add_addr(idev, &addr, 128, scope);
2547 return;
2548 }
2549
2550 for_each_netdev(net, dev) {
2551 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2552 if (in_dev && (dev->flags & IFF_UP)) {
2553 struct in_ifaddr *ifa;
2554
2555 int flag = scope;
2556
2557 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2558 int plen;
2559
2560 addr.s6_addr32[3] = ifa->ifa_local;
2561
2562 if (ifa->ifa_scope == RT_SCOPE_LINK)
2563 continue;
2564 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2565 if (idev->dev->flags&IFF_POINTOPOINT)
2566 continue;
2567 flag |= IFA_HOST;
2568 }
2569 if (idev->dev->flags&IFF_POINTOPOINT)
2570 plen = 64;
2571 else
2572 plen = 96;
2573
2574 add_addr(idev, &addr, plen, flag);
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, 0);
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, 0, 0);
2642 if (!IS_ERR(ifp)) {
2643 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2644 addrconf_dad_start(ifp);
2645 in6_ifa_put(ifp);
2646 }
2647 }
2648
2649 static void addrconf_dev_config(struct net_device *dev)
2650 {
2651 struct in6_addr addr;
2652 struct inet6_dev *idev;
2653
2654 ASSERT_RTNL();
2655
2656 if ((dev->type != ARPHRD_ETHER) &&
2657 (dev->type != ARPHRD_FDDI) &&
2658 (dev->type != ARPHRD_ARCNET) &&
2659 (dev->type != ARPHRD_INFINIBAND) &&
2660 (dev->type != ARPHRD_IEEE802154) &&
2661 (dev->type != ARPHRD_IEEE1394) &&
2662 (dev->type != ARPHRD_TUNNEL6)) {
2663 /* Alas, we support only Ethernet autoconfiguration. */
2664 return;
2665 }
2666
2667 idev = addrconf_add_dev(dev);
2668 if (IS_ERR(idev))
2669 return;
2670
2671 memset(&addr, 0, sizeof(struct in6_addr));
2672 addr.s6_addr32[0] = htonl(0xFE800000);
2673
2674 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2675 addrconf_add_linklocal(idev, &addr);
2676 }
2677
2678 #if IS_ENABLED(CONFIG_IPV6_SIT)
2679 static void addrconf_sit_config(struct net_device *dev)
2680 {
2681 struct inet6_dev *idev;
2682
2683 ASSERT_RTNL();
2684
2685 /*
2686 * Configure the tunnel with one of our IPv4
2687 * addresses... we should configure all of
2688 * our v4 addrs in the tunnel
2689 */
2690
2691 if ((idev = ipv6_find_idev(dev)) == NULL) {
2692 pr_debug("%s: add_dev failed\n", __func__);
2693 return;
2694 }
2695
2696 if (dev->priv_flags & IFF_ISATAP) {
2697 struct in6_addr addr;
2698
2699 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2700 addrconf_prefix_route(&addr, 64, dev, 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 else
2711 sit_route_add(dev);
2712 }
2713 #endif
2714
2715 #if IS_ENABLED(CONFIG_NET_IPGRE)
2716 static void addrconf_gre_config(struct net_device *dev)
2717 {
2718 struct inet6_dev *idev;
2719 struct in6_addr addr;
2720
2721 ASSERT_RTNL();
2722
2723 if ((idev = ipv6_find_idev(dev)) == NULL) {
2724 pr_debug("%s: add_dev failed\n", __func__);
2725 return;
2726 }
2727
2728 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2729 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2730
2731 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2732 addrconf_add_linklocal(idev, &addr);
2733 }
2734 #endif
2735
2736 static inline int
2737 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2738 {
2739 struct in6_addr lladdr;
2740
2741 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2742 addrconf_add_linklocal(idev, &lladdr);
2743 return 0;
2744 }
2745 return -1;
2746 }
2747
2748 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2749 void *ptr)
2750 {
2751 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2752 struct inet6_dev *idev = __in6_dev_get(dev);
2753 int run_pending = 0;
2754 int err;
2755
2756 switch (event) {
2757 case NETDEV_REGISTER:
2758 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2759 idev = ipv6_add_dev(dev);
2760 if (!idev)
2761 return notifier_from_errno(-ENOMEM);
2762 }
2763 break;
2764
2765 case NETDEV_UP:
2766 case NETDEV_CHANGE:
2767 if (dev->flags & IFF_SLAVE)
2768 break;
2769
2770 if (event == NETDEV_UP) {
2771 if (!addrconf_qdisc_ok(dev)) {
2772 /* device is not ready yet. */
2773 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2774 dev->name);
2775 break;
2776 }
2777
2778 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2779 idev = ipv6_add_dev(dev);
2780
2781 if (idev) {
2782 idev->if_flags |= IF_READY;
2783 run_pending = 1;
2784 }
2785 } else {
2786 if (!addrconf_qdisc_ok(dev)) {
2787 /* device is still not ready. */
2788 break;
2789 }
2790
2791 if (idev) {
2792 if (idev->if_flags & IF_READY)
2793 /* device is already configured. */
2794 break;
2795 idev->if_flags |= IF_READY;
2796 }
2797
2798 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2799 dev->name);
2800
2801 run_pending = 1;
2802 }
2803
2804 switch (dev->type) {
2805 #if IS_ENABLED(CONFIG_IPV6_SIT)
2806 case ARPHRD_SIT:
2807 addrconf_sit_config(dev);
2808 break;
2809 #endif
2810 #if IS_ENABLED(CONFIG_NET_IPGRE)
2811 case ARPHRD_IPGRE:
2812 addrconf_gre_config(dev);
2813 break;
2814 #endif
2815 case ARPHRD_LOOPBACK:
2816 init_loopback(dev);
2817 break;
2818
2819 default:
2820 addrconf_dev_config(dev);
2821 break;
2822 }
2823
2824 if (idev) {
2825 if (run_pending)
2826 addrconf_dad_run(idev);
2827
2828 /*
2829 * If the MTU changed during the interface down,
2830 * when the interface up, the changed MTU must be
2831 * reflected in the idev as well as routers.
2832 */
2833 if (idev->cnf.mtu6 != dev->mtu &&
2834 dev->mtu >= IPV6_MIN_MTU) {
2835 rt6_mtu_change(dev, dev->mtu);
2836 idev->cnf.mtu6 = dev->mtu;
2837 }
2838 idev->tstamp = jiffies;
2839 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2840
2841 /*
2842 * If the changed mtu during down is lower than
2843 * IPV6_MIN_MTU stop IPv6 on this interface.
2844 */
2845 if (dev->mtu < IPV6_MIN_MTU)
2846 addrconf_ifdown(dev, 1);
2847 }
2848 break;
2849
2850 case NETDEV_CHANGEMTU:
2851 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2852 rt6_mtu_change(dev, dev->mtu);
2853 idev->cnf.mtu6 = dev->mtu;
2854 break;
2855 }
2856
2857 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2858 idev = ipv6_add_dev(dev);
2859 if (idev)
2860 break;
2861 }
2862
2863 /*
2864 * MTU falled under IPV6_MIN_MTU.
2865 * Stop IPv6 on this interface.
2866 */
2867
2868 case NETDEV_DOWN:
2869 case NETDEV_UNREGISTER:
2870 /*
2871 * Remove all addresses from this interface.
2872 */
2873 addrconf_ifdown(dev, event != NETDEV_DOWN);
2874 break;
2875
2876 case NETDEV_CHANGENAME:
2877 if (idev) {
2878 snmp6_unregister_dev(idev);
2879 addrconf_sysctl_unregister(idev);
2880 addrconf_sysctl_register(idev);
2881 err = snmp6_register_dev(idev);
2882 if (err)
2883 return notifier_from_errno(err);
2884 }
2885 break;
2886
2887 case NETDEV_PRE_TYPE_CHANGE:
2888 case NETDEV_POST_TYPE_CHANGE:
2889 addrconf_type_change(dev, event);
2890 break;
2891 }
2892
2893 return NOTIFY_OK;
2894 }
2895
2896 /*
2897 * addrconf module should be notified of a device going up
2898 */
2899 static struct notifier_block ipv6_dev_notf = {
2900 .notifier_call = addrconf_notify,
2901 };
2902
2903 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2904 {
2905 struct inet6_dev *idev;
2906 ASSERT_RTNL();
2907
2908 idev = __in6_dev_get(dev);
2909
2910 if (event == NETDEV_POST_TYPE_CHANGE)
2911 ipv6_mc_remap(idev);
2912 else if (event == NETDEV_PRE_TYPE_CHANGE)
2913 ipv6_mc_unmap(idev);
2914 }
2915
2916 static int addrconf_ifdown(struct net_device *dev, int how)
2917 {
2918 struct net *net = dev_net(dev);
2919 struct inet6_dev *idev;
2920 struct inet6_ifaddr *ifa;
2921 int state, i;
2922
2923 ASSERT_RTNL();
2924
2925 rt6_ifdown(net, dev);
2926 neigh_ifdown(&nd_tbl, dev);
2927
2928 idev = __in6_dev_get(dev);
2929 if (idev == NULL)
2930 return -ENODEV;
2931
2932 /*
2933 * Step 1: remove reference to ipv6 device from parent device.
2934 * Do not dev_put!
2935 */
2936 if (how) {
2937 idev->dead = 1;
2938
2939 /* protected by rtnl_lock */
2940 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2941
2942 /* Step 1.5: remove snmp6 entry */
2943 snmp6_unregister_dev(idev);
2944
2945 }
2946
2947 /* Step 2: clear hash table */
2948 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2949 struct hlist_head *h = &inet6_addr_lst[i];
2950
2951 spin_lock_bh(&addrconf_hash_lock);
2952 restart:
2953 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
2954 if (ifa->idev == idev) {
2955 hlist_del_init_rcu(&ifa->addr_lst);
2956 addrconf_del_dad_timer(ifa);
2957 goto restart;
2958 }
2959 }
2960 spin_unlock_bh(&addrconf_hash_lock);
2961 }
2962
2963 write_lock_bh(&idev->lock);
2964
2965 addrconf_del_rs_timer(idev);
2966
2967 /* Step 2: clear flags for stateless addrconf */
2968 if (!how)
2969 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2970
2971 if (how && del_timer(&idev->regen_timer))
2972 in6_dev_put(idev);
2973
2974 /* Step 3: clear tempaddr list */
2975 while (!list_empty(&idev->tempaddr_list)) {
2976 ifa = list_first_entry(&idev->tempaddr_list,
2977 struct inet6_ifaddr, tmp_list);
2978 list_del(&ifa->tmp_list);
2979 write_unlock_bh(&idev->lock);
2980 spin_lock_bh(&ifa->lock);
2981
2982 if (ifa->ifpub) {
2983 in6_ifa_put(ifa->ifpub);
2984 ifa->ifpub = NULL;
2985 }
2986 spin_unlock_bh(&ifa->lock);
2987 in6_ifa_put(ifa);
2988 write_lock_bh(&idev->lock);
2989 }
2990
2991 while (!list_empty(&idev->addr_list)) {
2992 ifa = list_first_entry(&idev->addr_list,
2993 struct inet6_ifaddr, if_list);
2994 addrconf_del_dad_timer(ifa);
2995
2996 list_del(&ifa->if_list);
2997
2998 write_unlock_bh(&idev->lock);
2999
3000 spin_lock_bh(&ifa->state_lock);
3001 state = ifa->state;
3002 ifa->state = INET6_IFADDR_STATE_DEAD;
3003 spin_unlock_bh(&ifa->state_lock);
3004
3005 if (state != INET6_IFADDR_STATE_DEAD) {
3006 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3007 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3008 }
3009 in6_ifa_put(ifa);
3010
3011 write_lock_bh(&idev->lock);
3012 }
3013
3014 write_unlock_bh(&idev->lock);
3015
3016 /* Step 5: Discard multicast list */
3017 if (how)
3018 ipv6_mc_destroy_dev(idev);
3019 else
3020 ipv6_mc_down(idev);
3021
3022 idev->tstamp = jiffies;
3023
3024 /* Last: Shot the device (if unregistered) */
3025 if (how) {
3026 addrconf_sysctl_unregister(idev);
3027 neigh_parms_release(&nd_tbl, idev->nd_parms);
3028 neigh_ifdown(&nd_tbl, dev);
3029 in6_dev_put(idev);
3030 }
3031 return 0;
3032 }
3033
3034 static void addrconf_rs_timer(unsigned long data)
3035 {
3036 struct inet6_dev *idev = (struct inet6_dev *)data;
3037 struct net_device *dev = idev->dev;
3038 struct in6_addr lladdr;
3039
3040 write_lock(&idev->lock);
3041 if (idev->dead || !(idev->if_flags & IF_READY))
3042 goto out;
3043
3044 if (!ipv6_accept_ra(idev))
3045 goto out;
3046
3047 /* Announcement received after solicitation was sent */
3048 if (idev->if_flags & IF_RA_RCVD)
3049 goto out;
3050
3051 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3052 write_unlock(&idev->lock);
3053 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3054 ndisc_send_rs(dev, &lladdr,
3055 &in6addr_linklocal_allrouters);
3056 else
3057 goto put;
3058
3059 write_lock(&idev->lock);
3060 /* The wait after the last probe can be shorter */
3061 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3062 idev->cnf.rtr_solicits) ?
3063 idev->cnf.rtr_solicit_delay :
3064 idev->cnf.rtr_solicit_interval);
3065 } else {
3066 /*
3067 * Note: we do not support deprecated "all on-link"
3068 * assumption any longer.
3069 */
3070 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3071 }
3072
3073 out:
3074 write_unlock(&idev->lock);
3075 put:
3076 in6_dev_put(idev);
3077 }
3078
3079 /*
3080 * Duplicate Address Detection
3081 */
3082 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3083 {
3084 unsigned long rand_num;
3085 struct inet6_dev *idev = ifp->idev;
3086
3087 if (ifp->flags & IFA_F_OPTIMISTIC)
3088 rand_num = 0;
3089 else
3090 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3091
3092 ifp->dad_probes = idev->cnf.dad_transmits;
3093 addrconf_mod_dad_timer(ifp, rand_num);
3094 }
3095
3096 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3097 {
3098 struct inet6_dev *idev = ifp->idev;
3099 struct net_device *dev = idev->dev;
3100
3101 addrconf_join_solict(dev, &ifp->addr);
3102
3103 net_srandom(ifp->addr.s6_addr32[3]);
3104
3105 read_lock_bh(&idev->lock);
3106 spin_lock(&ifp->lock);
3107 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3108 goto out;
3109
3110 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3111 idev->cnf.accept_dad < 1 ||
3112 !(ifp->flags&IFA_F_TENTATIVE) ||
3113 ifp->flags & IFA_F_NODAD) {
3114 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3115 spin_unlock(&ifp->lock);
3116 read_unlock_bh(&idev->lock);
3117
3118 addrconf_dad_completed(ifp);
3119 return;
3120 }
3121
3122 if (!(idev->if_flags & IF_READY)) {
3123 spin_unlock(&ifp->lock);
3124 read_unlock_bh(&idev->lock);
3125 /*
3126 * If the device is not ready:
3127 * - keep it tentative if it is a permanent address.
3128 * - otherwise, kill it.
3129 */
3130 in6_ifa_hold(ifp);
3131 addrconf_dad_stop(ifp, 0);
3132 return;
3133 }
3134
3135 /*
3136 * Optimistic nodes can start receiving
3137 * Frames right away
3138 */
3139 if (ifp->flags & IFA_F_OPTIMISTIC)
3140 ip6_ins_rt(ifp->rt);
3141
3142 addrconf_dad_kick(ifp);
3143 out:
3144 spin_unlock(&ifp->lock);
3145 read_unlock_bh(&idev->lock);
3146 }
3147
3148 static void addrconf_dad_timer(unsigned long data)
3149 {
3150 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3151 struct inet6_dev *idev = ifp->idev;
3152 struct in6_addr mcaddr;
3153
3154 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3155 goto out;
3156
3157 write_lock(&idev->lock);
3158 if (idev->dead || !(idev->if_flags & IF_READY)) {
3159 write_unlock(&idev->lock);
3160 goto out;
3161 }
3162
3163 spin_lock(&ifp->lock);
3164 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3165 spin_unlock(&ifp->lock);
3166 write_unlock(&idev->lock);
3167 goto out;
3168 }
3169
3170 if (ifp->dad_probes == 0) {
3171 /*
3172 * DAD was successful
3173 */
3174
3175 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3176 spin_unlock(&ifp->lock);
3177 write_unlock(&idev->lock);
3178
3179 addrconf_dad_completed(ifp);
3180
3181 goto out;
3182 }
3183
3184 ifp->dad_probes--;
3185 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
3186 spin_unlock(&ifp->lock);
3187 write_unlock(&idev->lock);
3188
3189 /* send a neighbour solicitation for our addr */
3190 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3191 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3192 out:
3193 in6_ifa_put(ifp);
3194 }
3195
3196 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3197 {
3198 struct net_device *dev = ifp->idev->dev;
3199 struct in6_addr lladdr;
3200 bool send_rs, send_mld;
3201
3202 addrconf_del_dad_timer(ifp);
3203
3204 /*
3205 * Configure the address for reception. Now it is valid.
3206 */
3207
3208 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3209
3210 /* If added prefix is link local and we are prepared to process
3211 router advertisements, start sending router solicitations.
3212 */
3213
3214 read_lock_bh(&ifp->idev->lock);
3215 spin_lock(&ifp->lock);
3216 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3217 ifp->idev->valid_ll_addr_cnt == 1;
3218 send_rs = send_mld &&
3219 ipv6_accept_ra(ifp->idev) &&
3220 ifp->idev->cnf.rtr_solicits > 0 &&
3221 (dev->flags&IFF_LOOPBACK) == 0;
3222 spin_unlock(&ifp->lock);
3223 read_unlock_bh(&ifp->idev->lock);
3224
3225 /* While dad is in progress mld report's source address is in6_addrany.
3226 * Resend with proper ll now.
3227 */
3228 if (send_mld)
3229 ipv6_mc_dad_complete(ifp->idev);
3230
3231 if (send_rs) {
3232 /*
3233 * If a host as already performed a random delay
3234 * [...] as part of DAD [...] there is no need
3235 * to delay again before sending the first RS
3236 */
3237 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3238 return;
3239 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3240
3241 write_lock_bh(&ifp->idev->lock);
3242 spin_lock(&ifp->lock);
3243 ifp->idev->rs_probes = 1;
3244 ifp->idev->if_flags |= IF_RS_SENT;
3245 addrconf_mod_rs_timer(ifp->idev,
3246 ifp->idev->cnf.rtr_solicit_interval);
3247 spin_unlock(&ifp->lock);
3248 write_unlock_bh(&ifp->idev->lock);
3249 }
3250 }
3251
3252 static void addrconf_dad_run(struct inet6_dev *idev)
3253 {
3254 struct inet6_ifaddr *ifp;
3255
3256 read_lock_bh(&idev->lock);
3257 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3258 spin_lock(&ifp->lock);
3259 if (ifp->flags & IFA_F_TENTATIVE &&
3260 ifp->state == INET6_IFADDR_STATE_DAD)
3261 addrconf_dad_kick(ifp);
3262 spin_unlock(&ifp->lock);
3263 }
3264 read_unlock_bh(&idev->lock);
3265 }
3266
3267 #ifdef CONFIG_PROC_FS
3268 struct if6_iter_state {
3269 struct seq_net_private p;
3270 int bucket;
3271 int offset;
3272 };
3273
3274 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3275 {
3276 struct inet6_ifaddr *ifa = NULL;
3277 struct if6_iter_state *state = seq->private;
3278 struct net *net = seq_file_net(seq);
3279 int p = 0;
3280
3281 /* initial bucket if pos is 0 */
3282 if (pos == 0) {
3283 state->bucket = 0;
3284 state->offset = 0;
3285 }
3286
3287 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3288 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3289 addr_lst) {
3290 if (!net_eq(dev_net(ifa->idev->dev), net))
3291 continue;
3292 /* sync with offset */
3293 if (p < state->offset) {
3294 p++;
3295 continue;
3296 }
3297 state->offset++;
3298 return ifa;
3299 }
3300
3301 /* prepare for next bucket */
3302 state->offset = 0;
3303 p = 0;
3304 }
3305 return NULL;
3306 }
3307
3308 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3309 struct inet6_ifaddr *ifa)
3310 {
3311 struct if6_iter_state *state = seq->private;
3312 struct net *net = seq_file_net(seq);
3313
3314 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3315 if (!net_eq(dev_net(ifa->idev->dev), net))
3316 continue;
3317 state->offset++;
3318 return ifa;
3319 }
3320
3321 while (++state->bucket < IN6_ADDR_HSIZE) {
3322 state->offset = 0;
3323 hlist_for_each_entry_rcu_bh(ifa,
3324 &inet6_addr_lst[state->bucket], addr_lst) {
3325 if (!net_eq(dev_net(ifa->idev->dev), net))
3326 continue;
3327 state->offset++;
3328 return ifa;
3329 }
3330 }
3331
3332 return NULL;
3333 }
3334
3335 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3336 __acquires(rcu_bh)
3337 {
3338 rcu_read_lock_bh();
3339 return if6_get_first(seq, *pos);
3340 }
3341
3342 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3343 {
3344 struct inet6_ifaddr *ifa;
3345
3346 ifa = if6_get_next(seq, v);
3347 ++*pos;
3348 return ifa;
3349 }
3350
3351 static void if6_seq_stop(struct seq_file *seq, void *v)
3352 __releases(rcu_bh)
3353 {
3354 rcu_read_unlock_bh();
3355 }
3356
3357 static int if6_seq_show(struct seq_file *seq, void *v)
3358 {
3359 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3360 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3361 &ifp->addr,
3362 ifp->idev->dev->ifindex,
3363 ifp->prefix_len,
3364 ifp->scope,
3365 ifp->flags,
3366 ifp->idev->dev->name);
3367 return 0;
3368 }
3369
3370 static const struct seq_operations if6_seq_ops = {
3371 .start = if6_seq_start,
3372 .next = if6_seq_next,
3373 .show = if6_seq_show,
3374 .stop = if6_seq_stop,
3375 };
3376
3377 static int if6_seq_open(struct inode *inode, struct file *file)
3378 {
3379 return seq_open_net(inode, file, &if6_seq_ops,
3380 sizeof(struct if6_iter_state));
3381 }
3382
3383 static const struct file_operations if6_fops = {
3384 .owner = THIS_MODULE,
3385 .open = if6_seq_open,
3386 .read = seq_read,
3387 .llseek = seq_lseek,
3388 .release = seq_release_net,
3389 };
3390
3391 static int __net_init if6_proc_net_init(struct net *net)
3392 {
3393 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3394 return -ENOMEM;
3395 return 0;
3396 }
3397
3398 static void __net_exit if6_proc_net_exit(struct net *net)
3399 {
3400 remove_proc_entry("if_inet6", net->proc_net);
3401 }
3402
3403 static struct pernet_operations if6_proc_net_ops = {
3404 .init = if6_proc_net_init,
3405 .exit = if6_proc_net_exit,
3406 };
3407
3408 int __init if6_proc_init(void)
3409 {
3410 return register_pernet_subsys(&if6_proc_net_ops);
3411 }
3412
3413 void if6_proc_exit(void)
3414 {
3415 unregister_pernet_subsys(&if6_proc_net_ops);
3416 }
3417 #endif /* CONFIG_PROC_FS */
3418
3419 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3420 /* Check if address is a home address configured on any interface. */
3421 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3422 {
3423 int ret = 0;
3424 struct inet6_ifaddr *ifp = NULL;
3425 unsigned int hash = inet6_addr_hash(addr);
3426
3427 rcu_read_lock_bh();
3428 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3429 if (!net_eq(dev_net(ifp->idev->dev), net))
3430 continue;
3431 if (ipv6_addr_equal(&ifp->addr, addr) &&
3432 (ifp->flags & IFA_F_HOMEADDRESS)) {
3433 ret = 1;
3434 break;
3435 }
3436 }
3437 rcu_read_unlock_bh();
3438 return ret;
3439 }
3440 #endif
3441
3442 /*
3443 * Periodic address status verification
3444 */
3445
3446 static void addrconf_verify(unsigned long foo)
3447 {
3448 unsigned long now, next, next_sec, next_sched;
3449 struct inet6_ifaddr *ifp;
3450 int i;
3451
3452 rcu_read_lock_bh();
3453 spin_lock(&addrconf_verify_lock);
3454 now = jiffies;
3455 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3456
3457 del_timer(&addr_chk_timer);
3458
3459 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3460 restart:
3461 hlist_for_each_entry_rcu_bh(ifp,
3462 &inet6_addr_lst[i], addr_lst) {
3463 unsigned long age;
3464
3465 if (ifp->flags & IFA_F_PERMANENT)
3466 continue;
3467
3468 spin_lock(&ifp->lock);
3469 /* We try to batch several events at once. */
3470 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3471
3472 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3473 age >= ifp->valid_lft) {
3474 spin_unlock(&ifp->lock);
3475 in6_ifa_hold(ifp);
3476 ipv6_del_addr(ifp);
3477 goto restart;
3478 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3479 spin_unlock(&ifp->lock);
3480 continue;
3481 } else if (age >= ifp->prefered_lft) {
3482 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3483 int deprecate = 0;
3484
3485 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3486 deprecate = 1;
3487 ifp->flags |= IFA_F_DEPRECATED;
3488 }
3489
3490 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3491 next = ifp->tstamp + ifp->valid_lft * HZ;
3492
3493 spin_unlock(&ifp->lock);
3494
3495 if (deprecate) {
3496 in6_ifa_hold(ifp);
3497
3498 ipv6_ifa_notify(0, ifp);
3499 in6_ifa_put(ifp);
3500 goto restart;
3501 }
3502 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3503 !(ifp->flags&IFA_F_TENTATIVE)) {
3504 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3505 ifp->idev->cnf.dad_transmits *
3506 ifp->idev->nd_parms->retrans_time / HZ;
3507
3508 if (age >= ifp->prefered_lft - regen_advance) {
3509 struct inet6_ifaddr *ifpub = ifp->ifpub;
3510 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3511 next = ifp->tstamp + ifp->prefered_lft * HZ;
3512 if (!ifp->regen_count && ifpub) {
3513 ifp->regen_count++;
3514 in6_ifa_hold(ifp);
3515 in6_ifa_hold(ifpub);
3516 spin_unlock(&ifp->lock);
3517
3518 spin_lock(&ifpub->lock);
3519 ifpub->regen_count = 0;
3520 spin_unlock(&ifpub->lock);
3521 ipv6_create_tempaddr(ifpub, ifp);
3522 in6_ifa_put(ifpub);
3523 in6_ifa_put(ifp);
3524 goto restart;
3525 }
3526 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3527 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3528 spin_unlock(&ifp->lock);
3529 } else {
3530 /* ifp->prefered_lft <= ifp->valid_lft */
3531 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3532 next = ifp->tstamp + ifp->prefered_lft * HZ;
3533 spin_unlock(&ifp->lock);
3534 }
3535 }
3536 }
3537
3538 next_sec = round_jiffies_up(next);
3539 next_sched = next;
3540
3541 /* If rounded timeout is accurate enough, accept it. */
3542 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3543 next_sched = next_sec;
3544
3545 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3546 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3547 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3548
3549 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3550 now, next, next_sec, next_sched);
3551
3552 addr_chk_timer.expires = next_sched;
3553 add_timer(&addr_chk_timer);
3554 spin_unlock(&addrconf_verify_lock);
3555 rcu_read_unlock_bh();
3556 }
3557
3558 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3559 struct in6_addr **peer_pfx)
3560 {
3561 struct in6_addr *pfx = NULL;
3562
3563 *peer_pfx = NULL;
3564
3565 if (addr)
3566 pfx = nla_data(addr);
3567
3568 if (local) {
3569 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3570 *peer_pfx = pfx;
3571 pfx = nla_data(local);
3572 }
3573
3574 return pfx;
3575 }
3576
3577 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3578 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3579 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3580 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3581 };
3582
3583 static int
3584 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3585 {
3586 struct net *net = sock_net(skb->sk);
3587 struct ifaddrmsg *ifm;
3588 struct nlattr *tb[IFA_MAX+1];
3589 struct in6_addr *pfx, *peer_pfx;
3590 int err;
3591
3592 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3593 if (err < 0)
3594 return err;
3595
3596 ifm = nlmsg_data(nlh);
3597 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3598 if (pfx == NULL)
3599 return -EINVAL;
3600
3601 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3602 }
3603
3604 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3605 u32 prefered_lft, u32 valid_lft)
3606 {
3607 u32 flags;
3608 clock_t expires;
3609 unsigned long timeout;
3610
3611 if (!valid_lft || (prefered_lft > valid_lft))
3612 return -EINVAL;
3613
3614 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3615 if (addrconf_finite_timeout(timeout)) {
3616 expires = jiffies_to_clock_t(timeout * HZ);
3617 valid_lft = timeout;
3618 flags = RTF_EXPIRES;
3619 } else {
3620 expires = 0;
3621 flags = 0;
3622 ifa_flags |= IFA_F_PERMANENT;
3623 }
3624
3625 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3626 if (addrconf_finite_timeout(timeout)) {
3627 if (timeout == 0)
3628 ifa_flags |= IFA_F_DEPRECATED;
3629 prefered_lft = timeout;
3630 }
3631
3632 spin_lock_bh(&ifp->lock);
3633 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3634 ifp->tstamp = jiffies;
3635 ifp->valid_lft = valid_lft;
3636 ifp->prefered_lft = prefered_lft;
3637
3638 spin_unlock_bh(&ifp->lock);
3639 if (!(ifp->flags&IFA_F_TENTATIVE))
3640 ipv6_ifa_notify(0, ifp);
3641
3642 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3643 expires, flags);
3644 addrconf_verify(0);
3645
3646 return 0;
3647 }
3648
3649 static int
3650 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3651 {
3652 struct net *net = sock_net(skb->sk);
3653 struct ifaddrmsg *ifm;
3654 struct nlattr *tb[IFA_MAX+1];
3655 struct in6_addr *pfx, *peer_pfx;
3656 struct inet6_ifaddr *ifa;
3657 struct net_device *dev;
3658 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3659 u8 ifa_flags;
3660 int err;
3661
3662 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3663 if (err < 0)
3664 return err;
3665
3666 ifm = nlmsg_data(nlh);
3667 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3668 if (pfx == NULL)
3669 return -EINVAL;
3670
3671 if (tb[IFA_CACHEINFO]) {
3672 struct ifa_cacheinfo *ci;
3673
3674 ci = nla_data(tb[IFA_CACHEINFO]);
3675 valid_lft = ci->ifa_valid;
3676 preferred_lft = ci->ifa_prefered;
3677 } else {
3678 preferred_lft = INFINITY_LIFE_TIME;
3679 valid_lft = INFINITY_LIFE_TIME;
3680 }
3681
3682 dev = __dev_get_by_index(net, ifm->ifa_index);
3683 if (dev == NULL)
3684 return -ENODEV;
3685
3686 /* We ignore other flags so far. */
3687 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3688
3689 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3690 if (ifa == NULL) {
3691 /*
3692 * It would be best to check for !NLM_F_CREATE here but
3693 * userspace alreay relies on not having to provide this.
3694 */
3695 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3696 ifm->ifa_prefixlen, ifa_flags,
3697 preferred_lft, valid_lft);
3698 }
3699
3700 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3701 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3702 err = -EEXIST;
3703 else
3704 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3705
3706 in6_ifa_put(ifa);
3707
3708 return err;
3709 }
3710
3711 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3712 u8 scope, int ifindex)
3713 {
3714 struct ifaddrmsg *ifm;
3715
3716 ifm = nlmsg_data(nlh);
3717 ifm->ifa_family = AF_INET6;
3718 ifm->ifa_prefixlen = prefixlen;
3719 ifm->ifa_flags = flags;
3720 ifm->ifa_scope = scope;
3721 ifm->ifa_index = ifindex;
3722 }
3723
3724 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3725 unsigned long tstamp, u32 preferred, u32 valid)
3726 {
3727 struct ifa_cacheinfo ci;
3728
3729 ci.cstamp = cstamp_delta(cstamp);
3730 ci.tstamp = cstamp_delta(tstamp);
3731 ci.ifa_prefered = preferred;
3732 ci.ifa_valid = valid;
3733
3734 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3735 }
3736
3737 static inline int rt_scope(int ifa_scope)
3738 {
3739 if (ifa_scope & IFA_HOST)
3740 return RT_SCOPE_HOST;
3741 else if (ifa_scope & IFA_LINK)
3742 return RT_SCOPE_LINK;
3743 else if (ifa_scope & IFA_SITE)
3744 return RT_SCOPE_SITE;
3745 else
3746 return RT_SCOPE_UNIVERSE;
3747 }
3748
3749 static inline int inet6_ifaddr_msgsize(void)
3750 {
3751 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3752 + nla_total_size(16) /* IFA_LOCAL */
3753 + nla_total_size(16) /* IFA_ADDRESS */
3754 + nla_total_size(sizeof(struct ifa_cacheinfo));
3755 }
3756
3757 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3758 u32 portid, u32 seq, int event, unsigned int flags)
3759 {
3760 struct nlmsghdr *nlh;
3761 u32 preferred, valid;
3762
3763 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3764 if (nlh == NULL)
3765 return -EMSGSIZE;
3766
3767 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3768 ifa->idev->dev->ifindex);
3769
3770 if (!(ifa->flags&IFA_F_PERMANENT)) {
3771 preferred = ifa->prefered_lft;
3772 valid = ifa->valid_lft;
3773 if (preferred != INFINITY_LIFE_TIME) {
3774 long tval = (jiffies - ifa->tstamp)/HZ;
3775 if (preferred > tval)
3776 preferred -= tval;
3777 else
3778 preferred = 0;
3779 if (valid != INFINITY_LIFE_TIME) {
3780 if (valid > tval)
3781 valid -= tval;
3782 else
3783 valid = 0;
3784 }
3785 }
3786 } else {
3787 preferred = INFINITY_LIFE_TIME;
3788 valid = INFINITY_LIFE_TIME;
3789 }
3790
3791 if (!ipv6_addr_any(&ifa->peer_addr)) {
3792 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3793 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3794 goto error;
3795 } else
3796 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3797 goto error;
3798
3799 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3800 goto error;
3801
3802 return nlmsg_end(skb, nlh);
3803
3804 error:
3805 nlmsg_cancel(skb, nlh);
3806 return -EMSGSIZE;
3807 }
3808
3809 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3810 u32 portid, u32 seq, int event, u16 flags)
3811 {
3812 struct nlmsghdr *nlh;
3813 u8 scope = RT_SCOPE_UNIVERSE;
3814 int ifindex = ifmca->idev->dev->ifindex;
3815
3816 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3817 scope = RT_SCOPE_SITE;
3818
3819 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3820 if (nlh == NULL)
3821 return -EMSGSIZE;
3822
3823 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3824 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3825 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3826 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3827 nlmsg_cancel(skb, nlh);
3828 return -EMSGSIZE;
3829 }
3830
3831 return nlmsg_end(skb, nlh);
3832 }
3833
3834 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3835 u32 portid, u32 seq, int event, unsigned int flags)
3836 {
3837 struct nlmsghdr *nlh;
3838 u8 scope = RT_SCOPE_UNIVERSE;
3839 int ifindex = ifaca->aca_idev->dev->ifindex;
3840
3841 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3842 scope = RT_SCOPE_SITE;
3843
3844 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3845 if (nlh == NULL)
3846 return -EMSGSIZE;
3847
3848 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3849 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3850 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3851 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3852 nlmsg_cancel(skb, nlh);
3853 return -EMSGSIZE;
3854 }
3855
3856 return nlmsg_end(skb, nlh);
3857 }
3858
3859 enum addr_type_t {
3860 UNICAST_ADDR,
3861 MULTICAST_ADDR,
3862 ANYCAST_ADDR,
3863 };
3864
3865 /* called with rcu_read_lock() */
3866 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3867 struct netlink_callback *cb, enum addr_type_t type,
3868 int s_ip_idx, int *p_ip_idx)
3869 {
3870 struct ifmcaddr6 *ifmca;
3871 struct ifacaddr6 *ifaca;
3872 int err = 1;
3873 int ip_idx = *p_ip_idx;
3874
3875 read_lock_bh(&idev->lock);
3876 switch (type) {
3877 case UNICAST_ADDR: {
3878 struct inet6_ifaddr *ifa;
3879
3880 /* unicast address incl. temp addr */
3881 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3882 if (++ip_idx < s_ip_idx)
3883 continue;
3884 err = inet6_fill_ifaddr(skb, ifa,
3885 NETLINK_CB(cb->skb).portid,
3886 cb->nlh->nlmsg_seq,
3887 RTM_NEWADDR,
3888 NLM_F_MULTI);
3889 if (err <= 0)
3890 break;
3891 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3892 }
3893 break;
3894 }
3895 case MULTICAST_ADDR:
3896 /* multicast address */
3897 for (ifmca = idev->mc_list; ifmca;
3898 ifmca = ifmca->next, ip_idx++) {
3899 if (ip_idx < s_ip_idx)
3900 continue;
3901 err = inet6_fill_ifmcaddr(skb, ifmca,
3902 NETLINK_CB(cb->skb).portid,
3903 cb->nlh->nlmsg_seq,
3904 RTM_GETMULTICAST,
3905 NLM_F_MULTI);
3906 if (err <= 0)
3907 break;
3908 }
3909 break;
3910 case ANYCAST_ADDR:
3911 /* anycast address */
3912 for (ifaca = idev->ac_list; ifaca;
3913 ifaca = ifaca->aca_next, ip_idx++) {
3914 if (ip_idx < s_ip_idx)
3915 continue;
3916 err = inet6_fill_ifacaddr(skb, ifaca,
3917 NETLINK_CB(cb->skb).portid,
3918 cb->nlh->nlmsg_seq,
3919 RTM_GETANYCAST,
3920 NLM_F_MULTI);
3921 if (err <= 0)
3922 break;
3923 }
3924 break;
3925 default:
3926 break;
3927 }
3928 read_unlock_bh(&idev->lock);
3929 *p_ip_idx = ip_idx;
3930 return err;
3931 }
3932
3933 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3934 enum addr_type_t type)
3935 {
3936 struct net *net = sock_net(skb->sk);
3937 int h, s_h;
3938 int idx, ip_idx;
3939 int s_idx, s_ip_idx;
3940 struct net_device *dev;
3941 struct inet6_dev *idev;
3942 struct hlist_head *head;
3943
3944 s_h = cb->args[0];
3945 s_idx = idx = cb->args[1];
3946 s_ip_idx = ip_idx = cb->args[2];
3947
3948 rcu_read_lock();
3949 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
3950 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3951 idx = 0;
3952 head = &net->dev_index_head[h];
3953 hlist_for_each_entry_rcu(dev, head, index_hlist) {
3954 if (idx < s_idx)
3955 goto cont;
3956 if (h > s_h || idx > s_idx)
3957 s_ip_idx = 0;
3958 ip_idx = 0;
3959 idev = __in6_dev_get(dev);
3960 if (!idev)
3961 goto cont;
3962
3963 if (in6_dump_addrs(idev, skb, cb, type,
3964 s_ip_idx, &ip_idx) <= 0)
3965 goto done;
3966 cont:
3967 idx++;
3968 }
3969 }
3970 done:
3971 rcu_read_unlock();
3972 cb->args[0] = h;
3973 cb->args[1] = idx;
3974 cb->args[2] = ip_idx;
3975
3976 return skb->len;
3977 }
3978
3979 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3980 {
3981 enum addr_type_t type = UNICAST_ADDR;
3982
3983 return inet6_dump_addr(skb, cb, type);
3984 }
3985
3986 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3987 {
3988 enum addr_type_t type = MULTICAST_ADDR;
3989
3990 return inet6_dump_addr(skb, cb, type);
3991 }
3992
3993
3994 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3995 {
3996 enum addr_type_t type = ANYCAST_ADDR;
3997
3998 return inet6_dump_addr(skb, cb, type);
3999 }
4000
4001 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4002 {
4003 struct net *net = sock_net(in_skb->sk);
4004 struct ifaddrmsg *ifm;
4005 struct nlattr *tb[IFA_MAX+1];
4006 struct in6_addr *addr = NULL, *peer;
4007 struct net_device *dev = NULL;
4008 struct inet6_ifaddr *ifa;
4009 struct sk_buff *skb;
4010 int err;
4011
4012 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4013 if (err < 0)
4014 goto errout;
4015
4016 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4017 if (addr == NULL) {
4018 err = -EINVAL;
4019 goto errout;
4020 }
4021
4022 ifm = nlmsg_data(nlh);
4023 if (ifm->ifa_index)
4024 dev = __dev_get_by_index(net, ifm->ifa_index);
4025
4026 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4027 if (!ifa) {
4028 err = -EADDRNOTAVAIL;
4029 goto errout;
4030 }
4031
4032 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4033 if (!skb) {
4034 err = -ENOBUFS;
4035 goto errout_ifa;
4036 }
4037
4038 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4039 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4040 if (err < 0) {
4041 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4042 WARN_ON(err == -EMSGSIZE);
4043 kfree_skb(skb);
4044 goto errout_ifa;
4045 }
4046 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4047 errout_ifa:
4048 in6_ifa_put(ifa);
4049 errout:
4050 return err;
4051 }
4052
4053 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4054 {
4055 struct sk_buff *skb;
4056 struct net *net = dev_net(ifa->idev->dev);
4057 int err = -ENOBUFS;
4058
4059 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4060 if (skb == NULL)
4061 goto errout;
4062
4063 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4064 if (err < 0) {
4065 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4066 WARN_ON(err == -EMSGSIZE);
4067 kfree_skb(skb);
4068 goto errout;
4069 }
4070 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4071 return;
4072 errout:
4073 if (err < 0)
4074 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4075 }
4076
4077 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4078 __s32 *array, int bytes)
4079 {
4080 BUG_ON(bytes < (DEVCONF_MAX * 4));
4081
4082 memset(array, 0, bytes);
4083 array[DEVCONF_FORWARDING] = cnf->forwarding;
4084 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4085 array[DEVCONF_MTU6] = cnf->mtu6;
4086 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4087 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4088 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4089 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4090 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4091 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4092 jiffies_to_msecs(cnf->rtr_solicit_interval);
4093 array[DEVCONF_RTR_SOLICIT_DELAY] =
4094 jiffies_to_msecs(cnf->rtr_solicit_delay);
4095 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4096 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4097 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4098 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4099 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4100 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4101 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4102 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4103 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4104 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4105 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4106 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4107 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4108 #ifdef CONFIG_IPV6_ROUTER_PREF
4109 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4110 array[DEVCONF_RTR_PROBE_INTERVAL] =
4111 jiffies_to_msecs(cnf->rtr_probe_interval);
4112 #ifdef CONFIG_IPV6_ROUTE_INFO
4113 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4114 #endif
4115 #endif
4116 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4117 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4118 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4119 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4120 #endif
4121 #ifdef CONFIG_IPV6_MROUTE
4122 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4123 #endif
4124 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4125 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4126 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4127 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4128 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4129 }
4130
4131 static inline size_t inet6_ifla6_size(void)
4132 {
4133 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4134 + nla_total_size(sizeof(struct ifla_cacheinfo))
4135 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4136 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4137 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4138 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4139 }
4140
4141 static inline size_t inet6_if_nlmsg_size(void)
4142 {
4143 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4144 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4145 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4146 + nla_total_size(4) /* IFLA_MTU */
4147 + nla_total_size(4) /* IFLA_LINK */
4148 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4149 }
4150
4151 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4152 int items, int bytes)
4153 {
4154 int i;
4155 int pad = bytes - sizeof(u64) * items;
4156 BUG_ON(pad < 0);
4157
4158 /* Use put_unaligned() because stats may not be aligned for u64. */
4159 put_unaligned(items, &stats[0]);
4160 for (i = 1; i < items; i++)
4161 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4162
4163 memset(&stats[items], 0, pad);
4164 }
4165
4166 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4167 int items, int bytes, size_t syncpoff)
4168 {
4169 int i;
4170 int pad = bytes - sizeof(u64) * items;
4171 BUG_ON(pad < 0);
4172
4173 /* Use put_unaligned() because stats may not be aligned for u64. */
4174 put_unaligned(items, &stats[0]);
4175 for (i = 1; i < items; i++)
4176 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4177
4178 memset(&stats[items], 0, pad);
4179 }
4180
4181 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4182 int bytes)
4183 {
4184 switch (attrtype) {
4185 case IFLA_INET6_STATS:
4186 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4187 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4188 break;
4189 case IFLA_INET6_ICMP6STATS:
4190 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4191 break;
4192 }
4193 }
4194
4195 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4196 {
4197 struct nlattr *nla;
4198 struct ifla_cacheinfo ci;
4199
4200 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4201 goto nla_put_failure;
4202 ci.max_reasm_len = IPV6_MAXPLEN;
4203 ci.tstamp = cstamp_delta(idev->tstamp);
4204 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4205 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4206 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4207 goto nla_put_failure;
4208 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4209 if (nla == NULL)
4210 goto nla_put_failure;
4211 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4212
4213 /* XXX - MC not implemented */
4214
4215 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4216 if (nla == NULL)
4217 goto nla_put_failure;
4218 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4219
4220 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4221 if (nla == NULL)
4222 goto nla_put_failure;
4223 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4224
4225 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4226 if (nla == NULL)
4227 goto nla_put_failure;
4228 read_lock_bh(&idev->lock);
4229 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4230 read_unlock_bh(&idev->lock);
4231
4232 return 0;
4233
4234 nla_put_failure:
4235 return -EMSGSIZE;
4236 }
4237
4238 static size_t inet6_get_link_af_size(const struct net_device *dev)
4239 {
4240 if (!__in6_dev_get(dev))
4241 return 0;
4242
4243 return inet6_ifla6_size();
4244 }
4245
4246 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4247 {
4248 struct inet6_dev *idev = __in6_dev_get(dev);
4249
4250 if (!idev)
4251 return -ENODATA;
4252
4253 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4254 return -EMSGSIZE;
4255
4256 return 0;
4257 }
4258
4259 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4260 {
4261 struct inet6_ifaddr *ifp;
4262 struct net_device *dev = idev->dev;
4263 bool update_rs = false;
4264 struct in6_addr ll_addr;
4265
4266 if (token == NULL)
4267 return -EINVAL;
4268 if (ipv6_addr_any(token))
4269 return -EINVAL;
4270 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4271 return -EINVAL;
4272 if (!ipv6_accept_ra(idev))
4273 return -EINVAL;
4274 if (idev->cnf.rtr_solicits <= 0)
4275 return -EINVAL;
4276
4277 write_lock_bh(&idev->lock);
4278
4279 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4280 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4281
4282 write_unlock_bh(&idev->lock);
4283
4284 if (!idev->dead && (idev->if_flags & IF_READY) &&
4285 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4286 IFA_F_OPTIMISTIC)) {
4287
4288 /* If we're not ready, then normal ifup will take care
4289 * of this. Otherwise, we need to request our rs here.
4290 */
4291 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4292 update_rs = true;
4293 }
4294
4295 write_lock_bh(&idev->lock);
4296
4297 if (update_rs) {
4298 idev->if_flags |= IF_RS_SENT;
4299 idev->rs_probes = 1;
4300 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4301 }
4302
4303 /* Well, that's kinda nasty ... */
4304 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4305 spin_lock(&ifp->lock);
4306 if (ifp->tokenized) {
4307 ifp->valid_lft = 0;
4308 ifp->prefered_lft = 0;
4309 }
4310 spin_unlock(&ifp->lock);
4311 }
4312
4313 write_unlock_bh(&idev->lock);
4314 addrconf_verify(0);
4315 return 0;
4316 }
4317
4318 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4319 {
4320 int err = -EINVAL;
4321 struct inet6_dev *idev = __in6_dev_get(dev);
4322 struct nlattr *tb[IFLA_INET6_MAX + 1];
4323
4324 if (!idev)
4325 return -EAFNOSUPPORT;
4326
4327 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4328 BUG();
4329
4330 if (tb[IFLA_INET6_TOKEN])
4331 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4332
4333 return err;
4334 }
4335
4336 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4337 u32 portid, u32 seq, int event, unsigned int flags)
4338 {
4339 struct net_device *dev = idev->dev;
4340 struct ifinfomsg *hdr;
4341 struct nlmsghdr *nlh;
4342 void *protoinfo;
4343
4344 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4345 if (nlh == NULL)
4346 return -EMSGSIZE;
4347
4348 hdr = nlmsg_data(nlh);
4349 hdr->ifi_family = AF_INET6;
4350 hdr->__ifi_pad = 0;
4351 hdr->ifi_type = dev->type;
4352 hdr->ifi_index = dev->ifindex;
4353 hdr->ifi_flags = dev_get_flags(dev);
4354 hdr->ifi_change = 0;
4355
4356 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4357 (dev->addr_len &&
4358 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4359 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4360 (dev->ifindex != dev->iflink &&
4361 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4362 goto nla_put_failure;
4363 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4364 if (protoinfo == NULL)
4365 goto nla_put_failure;
4366
4367 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4368 goto nla_put_failure;
4369
4370 nla_nest_end(skb, protoinfo);
4371 return nlmsg_end(skb, nlh);
4372
4373 nla_put_failure:
4374 nlmsg_cancel(skb, nlh);
4375 return -EMSGSIZE;
4376 }
4377
4378 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4379 {
4380 struct net *net = sock_net(skb->sk);
4381 int h, s_h;
4382 int idx = 0, s_idx;
4383 struct net_device *dev;
4384 struct inet6_dev *idev;
4385 struct hlist_head *head;
4386
4387 s_h = cb->args[0];
4388 s_idx = cb->args[1];
4389
4390 rcu_read_lock();
4391 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4392 idx = 0;
4393 head = &net->dev_index_head[h];
4394 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4395 if (idx < s_idx)
4396 goto cont;
4397 idev = __in6_dev_get(dev);
4398 if (!idev)
4399 goto cont;
4400 if (inet6_fill_ifinfo(skb, idev,
4401 NETLINK_CB(cb->skb).portid,
4402 cb->nlh->nlmsg_seq,
4403 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4404 goto out;
4405 cont:
4406 idx++;
4407 }
4408 }
4409 out:
4410 rcu_read_unlock();
4411 cb->args[1] = idx;
4412 cb->args[0] = h;
4413
4414 return skb->len;
4415 }
4416
4417 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4418 {
4419 struct sk_buff *skb;
4420 struct net *net = dev_net(idev->dev);
4421 int err = -ENOBUFS;
4422
4423 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4424 if (skb == NULL)
4425 goto errout;
4426
4427 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4428 if (err < 0) {
4429 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4430 WARN_ON(err == -EMSGSIZE);
4431 kfree_skb(skb);
4432 goto errout;
4433 }
4434 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4435 return;
4436 errout:
4437 if (err < 0)
4438 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4439 }
4440
4441 static inline size_t inet6_prefix_nlmsg_size(void)
4442 {
4443 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4444 + nla_total_size(sizeof(struct in6_addr))
4445 + nla_total_size(sizeof(struct prefix_cacheinfo));
4446 }
4447
4448 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4449 struct prefix_info *pinfo, u32 portid, u32 seq,
4450 int event, unsigned int flags)
4451 {
4452 struct prefixmsg *pmsg;
4453 struct nlmsghdr *nlh;
4454 struct prefix_cacheinfo ci;
4455
4456 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4457 if (nlh == NULL)
4458 return -EMSGSIZE;
4459
4460 pmsg = nlmsg_data(nlh);
4461 pmsg->prefix_family = AF_INET6;
4462 pmsg->prefix_pad1 = 0;
4463 pmsg->prefix_pad2 = 0;
4464 pmsg->prefix_ifindex = idev->dev->ifindex;
4465 pmsg->prefix_len = pinfo->prefix_len;
4466 pmsg->prefix_type = pinfo->type;
4467 pmsg->prefix_pad3 = 0;
4468 pmsg->prefix_flags = 0;
4469 if (pinfo->onlink)
4470 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4471 if (pinfo->autoconf)
4472 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4473
4474 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4475 goto nla_put_failure;
4476 ci.preferred_time = ntohl(pinfo->prefered);
4477 ci.valid_time = ntohl(pinfo->valid);
4478 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4479 goto nla_put_failure;
4480 return nlmsg_end(skb, nlh);
4481
4482 nla_put_failure:
4483 nlmsg_cancel(skb, nlh);
4484 return -EMSGSIZE;
4485 }
4486
4487 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4488 struct prefix_info *pinfo)
4489 {
4490 struct sk_buff *skb;
4491 struct net *net = dev_net(idev->dev);
4492 int err = -ENOBUFS;
4493
4494 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4495 if (skb == NULL)
4496 goto errout;
4497
4498 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4499 if (err < 0) {
4500 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4501 WARN_ON(err == -EMSGSIZE);
4502 kfree_skb(skb);
4503 goto errout;
4504 }
4505 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4506 return;
4507 errout:
4508 if (err < 0)
4509 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4510 }
4511
4512 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4513 {
4514 write_lock_bh(&ifp->idev->lock);
4515 spin_lock(&ifp->lock);
4516 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4517 IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4518 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4519 ifp->idev->valid_ll_addr_cnt += count;
4520 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4521 spin_unlock(&ifp->lock);
4522 write_unlock_bh(&ifp->idev->lock);
4523 }
4524
4525 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4526 {
4527 struct net *net = dev_net(ifp->idev->dev);
4528
4529 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4530
4531 switch (event) {
4532 case RTM_NEWADDR:
4533 update_valid_ll_addr_cnt(ifp, 1);
4534
4535 /*
4536 * If the address was optimistic
4537 * we inserted the route at the start of
4538 * our DAD process, so we don't need
4539 * to do it again
4540 */
4541 if (!(ifp->rt->rt6i_node))
4542 ip6_ins_rt(ifp->rt);
4543 if (ifp->idev->cnf.forwarding)
4544 addrconf_join_anycast(ifp);
4545 if (!ipv6_addr_any(&ifp->peer_addr))
4546 addrconf_prefix_route(&ifp->peer_addr, 128,
4547 ifp->idev->dev, 0, 0);
4548 break;
4549 case RTM_DELADDR:
4550 update_valid_ll_addr_cnt(ifp, -1);
4551
4552 if (ifp->idev->cnf.forwarding)
4553 addrconf_leave_anycast(ifp);
4554 addrconf_leave_solict(ifp->idev, &ifp->addr);
4555 if (!ipv6_addr_any(&ifp->peer_addr)) {
4556 struct rt6_info *rt;
4557 struct net_device *dev = ifp->idev->dev;
4558
4559 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4560 dev->ifindex, 1);
4561 if (rt) {
4562 dst_hold(&rt->dst);
4563 if (ip6_del_rt(rt))
4564 dst_free(&rt->dst);
4565 }
4566 }
4567 dst_hold(&ifp->rt->dst);
4568
4569 if (ip6_del_rt(ifp->rt))
4570 dst_free(&ifp->rt->dst);
4571 break;
4572 }
4573 atomic_inc(&net->ipv6.dev_addr_genid);
4574 rt_genid_bump_ipv6(net);
4575 }
4576
4577 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4578 {
4579 rcu_read_lock_bh();
4580 if (likely(ifp->idev->dead == 0))
4581 __ipv6_ifa_notify(event, ifp);
4582 rcu_read_unlock_bh();
4583 }
4584
4585 #ifdef CONFIG_SYSCTL
4586
4587 static
4588 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4589 void __user *buffer, size_t *lenp, loff_t *ppos)
4590 {
4591 int *valp = ctl->data;
4592 int val = *valp;
4593 loff_t pos = *ppos;
4594 struct ctl_table lctl;
4595 int ret;
4596
4597 /*
4598 * ctl->data points to idev->cnf.forwarding, we should
4599 * not modify it until we get the rtnl lock.
4600 */
4601 lctl = *ctl;
4602 lctl.data = &val;
4603
4604 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4605
4606 if (write)
4607 ret = addrconf_fixup_forwarding(ctl, valp, val);
4608 if (ret)
4609 *ppos = pos;
4610 return ret;
4611 }
4612
4613 static void dev_disable_change(struct inet6_dev *idev)
4614 {
4615 struct netdev_notifier_info info;
4616
4617 if (!idev || !idev->dev)
4618 return;
4619
4620 netdev_notifier_info_init(&info, idev->dev);
4621 if (idev->cnf.disable_ipv6)
4622 addrconf_notify(NULL, NETDEV_DOWN, &info);
4623 else
4624 addrconf_notify(NULL, NETDEV_UP, &info);
4625 }
4626
4627 static void addrconf_disable_change(struct net *net, __s32 newf)
4628 {
4629 struct net_device *dev;
4630 struct inet6_dev *idev;
4631
4632 rcu_read_lock();
4633 for_each_netdev_rcu(net, dev) {
4634 idev = __in6_dev_get(dev);
4635 if (idev) {
4636 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4637 idev->cnf.disable_ipv6 = newf;
4638 if (changed)
4639 dev_disable_change(idev);
4640 }
4641 }
4642 rcu_read_unlock();
4643 }
4644
4645 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4646 {
4647 struct net *net;
4648 int old;
4649
4650 if (!rtnl_trylock())
4651 return restart_syscall();
4652
4653 net = (struct net *)table->extra2;
4654 old = *p;
4655 *p = newf;
4656
4657 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4658 rtnl_unlock();
4659 return 0;
4660 }
4661
4662 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4663 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4664 addrconf_disable_change(net, newf);
4665 } else if ((!newf) ^ (!old))
4666 dev_disable_change((struct inet6_dev *)table->extra1);
4667
4668 rtnl_unlock();
4669 return 0;
4670 }
4671
4672 static
4673 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4674 void __user *buffer, size_t *lenp, loff_t *ppos)
4675 {
4676 int *valp = ctl->data;
4677 int val = *valp;
4678 loff_t pos = *ppos;
4679 struct ctl_table lctl;
4680 int ret;
4681
4682 /*
4683 * ctl->data points to idev->cnf.disable_ipv6, we should
4684 * not modify it until we get the rtnl lock.
4685 */
4686 lctl = *ctl;
4687 lctl.data = &val;
4688
4689 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4690
4691 if (write)
4692 ret = addrconf_disable_ipv6(ctl, valp, val);
4693 if (ret)
4694 *ppos = pos;
4695 return ret;
4696 }
4697
4698 static struct addrconf_sysctl_table
4699 {
4700 struct ctl_table_header *sysctl_header;
4701 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4702 } addrconf_sysctl __read_mostly = {
4703 .sysctl_header = NULL,
4704 .addrconf_vars = {
4705 {
4706 .procname = "forwarding",
4707 .data = &ipv6_devconf.forwarding,
4708 .maxlen = sizeof(int),
4709 .mode = 0644,
4710 .proc_handler = addrconf_sysctl_forward,
4711 },
4712 {
4713 .procname = "hop_limit",
4714 .data = &ipv6_devconf.hop_limit,
4715 .maxlen = sizeof(int),
4716 .mode = 0644,
4717 .proc_handler = proc_dointvec,
4718 },
4719 {
4720 .procname = "mtu",
4721 .data = &ipv6_devconf.mtu6,
4722 .maxlen = sizeof(int),
4723 .mode = 0644,
4724 .proc_handler = proc_dointvec,
4725 },
4726 {
4727 .procname = "accept_ra",
4728 .data = &ipv6_devconf.accept_ra,
4729 .maxlen = sizeof(int),
4730 .mode = 0644,
4731 .proc_handler = proc_dointvec,
4732 },
4733 {
4734 .procname = "accept_redirects",
4735 .data = &ipv6_devconf.accept_redirects,
4736 .maxlen = sizeof(int),
4737 .mode = 0644,
4738 .proc_handler = proc_dointvec,
4739 },
4740 {
4741 .procname = "autoconf",
4742 .data = &ipv6_devconf.autoconf,
4743 .maxlen = sizeof(int),
4744 .mode = 0644,
4745 .proc_handler = proc_dointvec,
4746 },
4747 {
4748 .procname = "dad_transmits",
4749 .data = &ipv6_devconf.dad_transmits,
4750 .maxlen = sizeof(int),
4751 .mode = 0644,
4752 .proc_handler = proc_dointvec,
4753 },
4754 {
4755 .procname = "router_solicitations",
4756 .data = &ipv6_devconf.rtr_solicits,
4757 .maxlen = sizeof(int),
4758 .mode = 0644,
4759 .proc_handler = proc_dointvec,
4760 },
4761 {
4762 .procname = "router_solicitation_interval",
4763 .data = &ipv6_devconf.rtr_solicit_interval,
4764 .maxlen = sizeof(int),
4765 .mode = 0644,
4766 .proc_handler = proc_dointvec_jiffies,
4767 },
4768 {
4769 .procname = "router_solicitation_delay",
4770 .data = &ipv6_devconf.rtr_solicit_delay,
4771 .maxlen = sizeof(int),
4772 .mode = 0644,
4773 .proc_handler = proc_dointvec_jiffies,
4774 },
4775 {
4776 .procname = "force_mld_version",
4777 .data = &ipv6_devconf.force_mld_version,
4778 .maxlen = sizeof(int),
4779 .mode = 0644,
4780 .proc_handler = proc_dointvec,
4781 },
4782 {
4783 .procname = "mldv1_unsolicited_report_interval",
4784 .data =
4785 &ipv6_devconf.mldv1_unsolicited_report_interval,
4786 .maxlen = sizeof(int),
4787 .mode = 0644,
4788 .proc_handler = proc_dointvec_ms_jiffies,
4789 },
4790 {
4791 .procname = "mldv2_unsolicited_report_interval",
4792 .data =
4793 &ipv6_devconf.mldv2_unsolicited_report_interval,
4794 .maxlen = sizeof(int),
4795 .mode = 0644,
4796 .proc_handler = proc_dointvec_ms_jiffies,
4797 },
4798 {
4799 .procname = "use_tempaddr",
4800 .data = &ipv6_devconf.use_tempaddr,
4801 .maxlen = sizeof(int),
4802 .mode = 0644,
4803 .proc_handler = proc_dointvec,
4804 },
4805 {
4806 .procname = "temp_valid_lft",
4807 .data = &ipv6_devconf.temp_valid_lft,
4808 .maxlen = sizeof(int),
4809 .mode = 0644,
4810 .proc_handler = proc_dointvec,
4811 },
4812 {
4813 .procname = "temp_prefered_lft",
4814 .data = &ipv6_devconf.temp_prefered_lft,
4815 .maxlen = sizeof(int),
4816 .mode = 0644,
4817 .proc_handler = proc_dointvec,
4818 },
4819 {
4820 .procname = "regen_max_retry",
4821 .data = &ipv6_devconf.regen_max_retry,
4822 .maxlen = sizeof(int),
4823 .mode = 0644,
4824 .proc_handler = proc_dointvec,
4825 },
4826 {
4827 .procname = "max_desync_factor",
4828 .data = &ipv6_devconf.max_desync_factor,
4829 .maxlen = sizeof(int),
4830 .mode = 0644,
4831 .proc_handler = proc_dointvec,
4832 },
4833 {
4834 .procname = "max_addresses",
4835 .data = &ipv6_devconf.max_addresses,
4836 .maxlen = sizeof(int),
4837 .mode = 0644,
4838 .proc_handler = proc_dointvec,
4839 },
4840 {
4841 .procname = "accept_ra_defrtr",
4842 .data = &ipv6_devconf.accept_ra_defrtr,
4843 .maxlen = sizeof(int),
4844 .mode = 0644,
4845 .proc_handler = proc_dointvec,
4846 },
4847 {
4848 .procname = "accept_ra_pinfo",
4849 .data = &ipv6_devconf.accept_ra_pinfo,
4850 .maxlen = sizeof(int),
4851 .mode = 0644,
4852 .proc_handler = proc_dointvec,
4853 },
4854 #ifdef CONFIG_IPV6_ROUTER_PREF
4855 {
4856 .procname = "accept_ra_rtr_pref",
4857 .data = &ipv6_devconf.accept_ra_rtr_pref,
4858 .maxlen = sizeof(int),
4859 .mode = 0644,
4860 .proc_handler = proc_dointvec,
4861 },
4862 {
4863 .procname = "router_probe_interval",
4864 .data = &ipv6_devconf.rtr_probe_interval,
4865 .maxlen = sizeof(int),
4866 .mode = 0644,
4867 .proc_handler = proc_dointvec_jiffies,
4868 },
4869 #ifdef CONFIG_IPV6_ROUTE_INFO
4870 {
4871 .procname = "accept_ra_rt_info_max_plen",
4872 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4873 .maxlen = sizeof(int),
4874 .mode = 0644,
4875 .proc_handler = proc_dointvec,
4876 },
4877 #endif
4878 #endif
4879 {
4880 .procname = "proxy_ndp",
4881 .data = &ipv6_devconf.proxy_ndp,
4882 .maxlen = sizeof(int),
4883 .mode = 0644,
4884 .proc_handler = proc_dointvec,
4885 },
4886 {
4887 .procname = "accept_source_route",
4888 .data = &ipv6_devconf.accept_source_route,
4889 .maxlen = sizeof(int),
4890 .mode = 0644,
4891 .proc_handler = proc_dointvec,
4892 },
4893 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4894 {
4895 .procname = "optimistic_dad",
4896 .data = &ipv6_devconf.optimistic_dad,
4897 .maxlen = sizeof(int),
4898 .mode = 0644,
4899 .proc_handler = proc_dointvec,
4900
4901 },
4902 #endif
4903 #ifdef CONFIG_IPV6_MROUTE
4904 {
4905 .procname = "mc_forwarding",
4906 .data = &ipv6_devconf.mc_forwarding,
4907 .maxlen = sizeof(int),
4908 .mode = 0444,
4909 .proc_handler = proc_dointvec,
4910 },
4911 #endif
4912 {
4913 .procname = "disable_ipv6",
4914 .data = &ipv6_devconf.disable_ipv6,
4915 .maxlen = sizeof(int),
4916 .mode = 0644,
4917 .proc_handler = addrconf_sysctl_disable,
4918 },
4919 {
4920 .procname = "accept_dad",
4921 .data = &ipv6_devconf.accept_dad,
4922 .maxlen = sizeof(int),
4923 .mode = 0644,
4924 .proc_handler = proc_dointvec,
4925 },
4926 {
4927 .procname = "force_tllao",
4928 .data = &ipv6_devconf.force_tllao,
4929 .maxlen = sizeof(int),
4930 .mode = 0644,
4931 .proc_handler = proc_dointvec
4932 },
4933 {
4934 .procname = "ndisc_notify",
4935 .data = &ipv6_devconf.ndisc_notify,
4936 .maxlen = sizeof(int),
4937 .mode = 0644,
4938 .proc_handler = proc_dointvec
4939 },
4940 {
4941 .procname = "suppress_frag_ndisc",
4942 .data = &ipv6_devconf.suppress_frag_ndisc,
4943 .maxlen = sizeof(int),
4944 .mode = 0644,
4945 .proc_handler = proc_dointvec
4946 },
4947 {
4948 /* sentinel */
4949 }
4950 },
4951 };
4952
4953 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4954 struct inet6_dev *idev, struct ipv6_devconf *p)
4955 {
4956 int i;
4957 struct addrconf_sysctl_table *t;
4958 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4959
4960 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4961 if (t == NULL)
4962 goto out;
4963
4964 for (i = 0; t->addrconf_vars[i].data; i++) {
4965 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4966 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4967 t->addrconf_vars[i].extra2 = net;
4968 }
4969
4970 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4971
4972 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4973 if (t->sysctl_header == NULL)
4974 goto free;
4975
4976 p->sysctl = t;
4977 return 0;
4978
4979 free:
4980 kfree(t);
4981 out:
4982 return -ENOBUFS;
4983 }
4984
4985 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4986 {
4987 struct addrconf_sysctl_table *t;
4988
4989 if (p->sysctl == NULL)
4990 return;
4991
4992 t = p->sysctl;
4993 p->sysctl = NULL;
4994 unregister_net_sysctl_table(t->sysctl_header);
4995 kfree(t);
4996 }
4997
4998 static void addrconf_sysctl_register(struct inet6_dev *idev)
4999 {
5000 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
5001 &ndisc_ifinfo_sysctl_change);
5002 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5003 idev, &idev->cnf);
5004 }
5005
5006 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5007 {
5008 __addrconf_sysctl_unregister(&idev->cnf);
5009 neigh_sysctl_unregister(idev->nd_parms);
5010 }
5011
5012
5013 #endif
5014
5015 static int __net_init addrconf_init_net(struct net *net)
5016 {
5017 int err = -ENOMEM;
5018 struct ipv6_devconf *all, *dflt;
5019
5020 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5021 if (all == NULL)
5022 goto err_alloc_all;
5023
5024 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5025 if (dflt == NULL)
5026 goto err_alloc_dflt;
5027
5028 /* these will be inherited by all namespaces */
5029 dflt->autoconf = ipv6_defaults.autoconf;
5030 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5031
5032 net->ipv6.devconf_all = all;
5033 net->ipv6.devconf_dflt = dflt;
5034
5035 #ifdef CONFIG_SYSCTL
5036 err = __addrconf_sysctl_register(net, "all", NULL, all);
5037 if (err < 0)
5038 goto err_reg_all;
5039
5040 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5041 if (err < 0)
5042 goto err_reg_dflt;
5043 #endif
5044 return 0;
5045
5046 #ifdef CONFIG_SYSCTL
5047 err_reg_dflt:
5048 __addrconf_sysctl_unregister(all);
5049 err_reg_all:
5050 kfree(dflt);
5051 #endif
5052 err_alloc_dflt:
5053 kfree(all);
5054 err_alloc_all:
5055 return err;
5056 }
5057
5058 static void __net_exit addrconf_exit_net(struct net *net)
5059 {
5060 #ifdef CONFIG_SYSCTL
5061 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5062 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5063 #endif
5064 if (!net_eq(net, &init_net)) {
5065 kfree(net->ipv6.devconf_dflt);
5066 kfree(net->ipv6.devconf_all);
5067 }
5068 }
5069
5070 static struct pernet_operations addrconf_ops = {
5071 .init = addrconf_init_net,
5072 .exit = addrconf_exit_net,
5073 };
5074
5075 static struct rtnl_af_ops inet6_ops = {
5076 .family = AF_INET6,
5077 .fill_link_af = inet6_fill_link_af,
5078 .get_link_af_size = inet6_get_link_af_size,
5079 .set_link_af = inet6_set_link_af,
5080 };
5081
5082 /*
5083 * Init / cleanup code
5084 */
5085
5086 int __init addrconf_init(void)
5087 {
5088 int i, err;
5089
5090 err = ipv6_addr_label_init();
5091 if (err < 0) {
5092 pr_crit("%s: cannot initialize default policy table: %d\n",
5093 __func__, err);
5094 goto out;
5095 }
5096
5097 err = register_pernet_subsys(&addrconf_ops);
5098 if (err < 0)
5099 goto out_addrlabel;
5100
5101 /* The addrconf netdev notifier requires that loopback_dev
5102 * has it's ipv6 private information allocated and setup
5103 * before it can bring up and give link-local addresses
5104 * to other devices which are up.
5105 *
5106 * Unfortunately, loopback_dev is not necessarily the first
5107 * entry in the global dev_base list of net devices. In fact,
5108 * it is likely to be the very last entry on that list.
5109 * So this causes the notifier registry below to try and
5110 * give link-local addresses to all devices besides loopback_dev
5111 * first, then loopback_dev, which cases all the non-loopback_dev
5112 * devices to fail to get a link-local address.
5113 *
5114 * So, as a temporary fix, allocate the ipv6 structure for
5115 * loopback_dev first by hand.
5116 * Longer term, all of the dependencies ipv6 has upon the loopback
5117 * device and it being up should be removed.
5118 */
5119 rtnl_lock();
5120 if (!ipv6_add_dev(init_net.loopback_dev))
5121 err = -ENOMEM;
5122 rtnl_unlock();
5123 if (err)
5124 goto errlo;
5125
5126 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5127 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5128
5129 register_netdevice_notifier(&ipv6_dev_notf);
5130
5131 addrconf_verify(0);
5132
5133 err = rtnl_af_register(&inet6_ops);
5134 if (err < 0)
5135 goto errout_af;
5136
5137 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5138 NULL);
5139 if (err < 0)
5140 goto errout;
5141
5142 /* Only the first call to __rtnl_register can fail */
5143 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5144 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5145 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5146 inet6_dump_ifaddr, NULL);
5147 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5148 inet6_dump_ifmcaddr, NULL);
5149 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5150 inet6_dump_ifacaddr, NULL);
5151 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5152 inet6_netconf_dump_devconf, NULL);
5153
5154 ipv6_addr_label_rtnl_register();
5155
5156 return 0;
5157 errout:
5158 rtnl_af_unregister(&inet6_ops);
5159 errout_af:
5160 unregister_netdevice_notifier(&ipv6_dev_notf);
5161 errlo:
5162 unregister_pernet_subsys(&addrconf_ops);
5163 out_addrlabel:
5164 ipv6_addr_label_cleanup();
5165 out:
5166 return err;
5167 }
5168
5169 void addrconf_cleanup(void)
5170 {
5171 struct net_device *dev;
5172 int i;
5173
5174 unregister_netdevice_notifier(&ipv6_dev_notf);
5175 unregister_pernet_subsys(&addrconf_ops);
5176 ipv6_addr_label_cleanup();
5177
5178 rtnl_lock();
5179
5180 __rtnl_af_unregister(&inet6_ops);
5181
5182 /* clean dev list */
5183 for_each_netdev(&init_net, dev) {
5184 if (__in6_dev_get(dev) == NULL)
5185 continue;
5186 addrconf_ifdown(dev, 1);
5187 }
5188 addrconf_ifdown(init_net.loopback_dev, 2);
5189
5190 /*
5191 * Check hash table.
5192 */
5193 spin_lock_bh(&addrconf_hash_lock);
5194 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5195 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5196 spin_unlock_bh(&addrconf_hash_lock);
5197
5198 del_timer(&addr_chk_timer);
5199 rtnl_unlock();
5200 }
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