projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetoot...
[deliverable/linux.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/in6.h>
50 #include <linux/netdevice.h>
51 #include <linux/if_addr.h>
52 #include <linux/if_arp.h>
53 #include <linux/if_arcnet.h>
54 #include <linux/if_infiniband.h>
55 #include <linux/route.h>
56 #include <linux/inetdevice.h>
57 #include <linux/init.h>
58 #include <linux/slab.h>
59 #ifdef CONFIG_SYSCTL
60 #include <linux/sysctl.h>
61 #endif
62 #include <linux/capability.h>
63 #include <linux/delay.h>
64 #include <linux/notifier.h>
65 #include <linux/string.h>
66 #include <linux/hash.h>
67
68 #include <net/net_namespace.h>
69 #include <net/sock.h>
70 #include <net/snmp.h>
71
72 #include <net/af_ieee802154.h>
73 #include <net/firewire.h>
74 #include <net/ipv6.h>
75 #include <net/protocol.h>
76 #include <net/ndisc.h>
77 #include <net/ip6_route.h>
78 #include <net/addrconf.h>
79 #include <net/tcp.h>
80 #include <net/ip.h>
81 #include <net/netlink.h>
82 #include <net/pkt_sched.h>
83 #include <linux/if_tunnel.h>
84 #include <linux/rtnetlink.h>
85 #include <linux/netconf.h>
86 #include <linux/random.h>
87 #include <linux/uaccess.h>
88 #include <asm/unaligned.h>
89
90 #include <linux/proc_fs.h>
91 #include <linux/seq_file.h>
92 #include <linux/export.h>
93
94 /* Set to 3 to get tracing... */
95 #define ACONF_DEBUG 2
96
97 #if ACONF_DEBUG >= 3
98 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
99 #else
100 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
101 #endif
102
103 #define INFINITY_LIFE_TIME 0xFFFFFFFF
104
105 static inline u32 cstamp_delta(unsigned long cstamp)
106 {
107 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
108 }
109
110 #ifdef CONFIG_SYSCTL
111 static void addrconf_sysctl_register(struct inet6_dev *idev);
112 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
113 #else
114 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
115 {
116 }
117
118 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
119 {
120 }
121 #endif
122
123 static void __ipv6_regen_rndid(struct inet6_dev *idev);
124 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
125 static void ipv6_regen_rndid(unsigned long data);
126
127 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
128 static int ipv6_count_addresses(struct inet6_dev *idev);
129
130 /*
131 * Configured unicast address hash table
132 */
133 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
134 static DEFINE_SPINLOCK(addrconf_hash_lock);
135
136 static void addrconf_verify(unsigned long);
137
138 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
139 static DEFINE_SPINLOCK(addrconf_verify_lock);
140
141 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
142 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
143
144 static void addrconf_type_change(struct net_device *dev,
145 unsigned long event);
146 static int addrconf_ifdown(struct net_device *dev, int how);
147
148 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
149 int plen,
150 const struct net_device *dev,
151 u32 flags, u32 noflags);
152
153 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
154 static void addrconf_dad_timer(unsigned long data);
155 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
156 static void addrconf_dad_run(struct inet6_dev *idev);
157 static void addrconf_rs_timer(unsigned long data);
158 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
159 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
160
161 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
162 struct prefix_info *pinfo);
163 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
164 struct net_device *dev);
165
166 static struct ipv6_devconf ipv6_devconf __read_mostly = {
167 .forwarding = 0,
168 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
169 .mtu6 = IPV6_MIN_MTU,
170 .accept_ra = 1,
171 .accept_redirects = 1,
172 .autoconf = 1,
173 .force_mld_version = 0,
174 .mldv1_unsolicited_report_interval = 10 * HZ,
175 .mldv2_unsolicited_report_interval = HZ,
176 .dad_transmits = 1,
177 .rtr_solicits = MAX_RTR_SOLICITATIONS,
178 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
179 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
180 .use_tempaddr = 0,
181 .temp_valid_lft = TEMP_VALID_LIFETIME,
182 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
183 .regen_max_retry = REGEN_MAX_RETRY,
184 .max_desync_factor = MAX_DESYNC_FACTOR,
185 .max_addresses = IPV6_MAX_ADDRESSES,
186 .accept_ra_defrtr = 1,
187 .accept_ra_pinfo = 1,
188 #ifdef CONFIG_IPV6_ROUTER_PREF
189 .accept_ra_rtr_pref = 1,
190 .rtr_probe_interval = 60 * HZ,
191 #ifdef CONFIG_IPV6_ROUTE_INFO
192 .accept_ra_rt_info_max_plen = 0,
193 #endif
194 #endif
195 .proxy_ndp = 0,
196 .accept_source_route = 0, /* we do not accept RH0 by default. */
197 .disable_ipv6 = 0,
198 .accept_dad = 1,
199 .suppress_frag_ndisc = 1,
200 };
201
202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
203 .forwarding = 0,
204 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
205 .mtu6 = IPV6_MIN_MTU,
206 .accept_ra = 1,
207 .accept_redirects = 1,
208 .autoconf = 1,
209 .force_mld_version = 0,
210 .mldv1_unsolicited_report_interval = 10 * HZ,
211 .mldv2_unsolicited_report_interval = HZ,
212 .dad_transmits = 1,
213 .rtr_solicits = MAX_RTR_SOLICITATIONS,
214 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
215 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
216 .use_tempaddr = 0,
217 .temp_valid_lft = TEMP_VALID_LIFETIME,
218 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
219 .regen_max_retry = REGEN_MAX_RETRY,
220 .max_desync_factor = MAX_DESYNC_FACTOR,
221 .max_addresses = IPV6_MAX_ADDRESSES,
222 .accept_ra_defrtr = 1,
223 .accept_ra_pinfo = 1,
224 #ifdef CONFIG_IPV6_ROUTER_PREF
225 .accept_ra_rtr_pref = 1,
226 .rtr_probe_interval = 60 * HZ,
227 #ifdef CONFIG_IPV6_ROUTE_INFO
228 .accept_ra_rt_info_max_plen = 0,
229 #endif
230 #endif
231 .proxy_ndp = 0,
232 .accept_source_route = 0, /* we do not accept RH0 by default. */
233 .disable_ipv6 = 0,
234 .accept_dad = 1,
235 .suppress_frag_ndisc = 1,
236 };
237
238 /* Check if a valid qdisc is available */
239 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
240 {
241 return !qdisc_tx_is_noop(dev);
242 }
243
244 static void addrconf_del_rs_timer(struct inet6_dev *idev)
245 {
246 if (del_timer(&idev->rs_timer))
247 __in6_dev_put(idev);
248 }
249
250 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
251 {
252 if (del_timer(&ifp->dad_timer))
253 __in6_ifa_put(ifp);
254 }
255
256 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
257 unsigned long when)
258 {
259 if (!timer_pending(&idev->rs_timer))
260 in6_dev_hold(idev);
261 mod_timer(&idev->rs_timer, jiffies + when);
262 }
263
264 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
265 unsigned long when)
266 {
267 if (!timer_pending(&ifp->dad_timer))
268 in6_ifa_hold(ifp);
269 mod_timer(&ifp->dad_timer, jiffies + when);
270 }
271
272 static int snmp6_alloc_dev(struct inet6_dev *idev)
273 {
274 int i;
275
276 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
277 sizeof(struct ipstats_mib),
278 __alignof__(struct ipstats_mib)) < 0)
279 goto err_ip;
280
281 for_each_possible_cpu(i) {
282 struct ipstats_mib *addrconf_stats;
283 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[0], i);
284 u64_stats_init(&addrconf_stats->syncp);
285 #if SNMP_ARRAY_SZ == 2
286 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[1], i);
287 u64_stats_init(&addrconf_stats->syncp);
288 #endif
289 }
290
291
292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
293 GFP_KERNEL);
294 if (!idev->stats.icmpv6dev)
295 goto err_icmp;
296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
297 GFP_KERNEL);
298 if (!idev->stats.icmpv6msgdev)
299 goto err_icmpmsg;
300
301 return 0;
302
303 err_icmpmsg:
304 kfree(idev->stats.icmpv6dev);
305 err_icmp:
306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
307 err_ip:
308 return -ENOMEM;
309 }
310
311 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
312 {
313 struct inet6_dev *ndev;
314
315 ASSERT_RTNL();
316
317 if (dev->mtu < IPV6_MIN_MTU)
318 return NULL;
319
320 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
321
322 if (ndev == NULL)
323 return NULL;
324
325 rwlock_init(&ndev->lock);
326 ndev->dev = dev;
327 INIT_LIST_HEAD(&ndev->addr_list);
328 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
329 (unsigned long)ndev);
330 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
331 ndev->cnf.mtu6 = dev->mtu;
332 ndev->cnf.sysctl = NULL;
333 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
334 if (ndev->nd_parms == NULL) {
335 kfree(ndev);
336 return NULL;
337 }
338 if (ndev->cnf.forwarding)
339 dev_disable_lro(dev);
340 /* We refer to the device */
341 dev_hold(dev);
342
343 if (snmp6_alloc_dev(ndev) < 0) {
344 ADBG(KERN_WARNING
345 "%s: cannot allocate memory for statistics; dev=%s.\n",
346 __func__, dev->name);
347 neigh_parms_release(&nd_tbl, ndev->nd_parms);
348 dev_put(dev);
349 kfree(ndev);
350 return NULL;
351 }
352
353 if (snmp6_register_dev(ndev) < 0) {
354 ADBG(KERN_WARNING
355 "%s: cannot create /proc/net/dev_snmp6/%s\n",
356 __func__, dev->name);
357 neigh_parms_release(&nd_tbl, ndev->nd_parms);
358 ndev->dead = 1;
359 in6_dev_finish_destroy(ndev);
360 return NULL;
361 }
362
363 /* One reference from device. We must do this before
364 * we invoke __ipv6_regen_rndid().
365 */
366 in6_dev_hold(ndev);
367
368 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
369 ndev->cnf.accept_dad = -1;
370
371 #if IS_ENABLED(CONFIG_IPV6_SIT)
372 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
373 pr_info("%s: Disabled Multicast RS\n", dev->name);
374 ndev->cnf.rtr_solicits = 0;
375 }
376 #endif
377
378 INIT_LIST_HEAD(&ndev->tempaddr_list);
379 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
380 if ((dev->flags&IFF_LOOPBACK) ||
381 dev->type == ARPHRD_TUNNEL ||
382 dev->type == ARPHRD_TUNNEL6 ||
383 dev->type == ARPHRD_SIT ||
384 dev->type == ARPHRD_NONE) {
385 ndev->cnf.use_tempaddr = -1;
386 } else {
387 in6_dev_hold(ndev);
388 ipv6_regen_rndid((unsigned long) ndev);
389 }
390
391 ndev->token = in6addr_any;
392
393 if (netif_running(dev) && addrconf_qdisc_ok(dev))
394 ndev->if_flags |= IF_READY;
395
396 ipv6_mc_init_dev(ndev);
397 ndev->tstamp = jiffies;
398 addrconf_sysctl_register(ndev);
399 /* protected by rtnl_lock */
400 rcu_assign_pointer(dev->ip6_ptr, ndev);
401
402 /* Join interface-local all-node multicast group */
403 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
404
405 /* Join all-node multicast group */
406 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
407
408 /* Join all-router multicast group if forwarding is set */
409 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
410 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
411
412 return ndev;
413 }
414
415 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
416 {
417 struct inet6_dev *idev;
418
419 ASSERT_RTNL();
420
421 idev = __in6_dev_get(dev);
422 if (!idev) {
423 idev = ipv6_add_dev(dev);
424 if (!idev)
425 return NULL;
426 }
427
428 if (dev->flags&IFF_UP)
429 ipv6_mc_up(idev);
430 return idev;
431 }
432
433 static int inet6_netconf_msgsize_devconf(int type)
434 {
435 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
436 + nla_total_size(4); /* NETCONFA_IFINDEX */
437
438 /* type -1 is used for ALL */
439 if (type == -1 || type == NETCONFA_FORWARDING)
440 size += nla_total_size(4);
441 #ifdef CONFIG_IPV6_MROUTE
442 if (type == -1 || type == NETCONFA_MC_FORWARDING)
443 size += nla_total_size(4);
444 #endif
445
446 return size;
447 }
448
449 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
450 struct ipv6_devconf *devconf, u32 portid,
451 u32 seq, int event, unsigned int flags,
452 int type)
453 {
454 struct nlmsghdr *nlh;
455 struct netconfmsg *ncm;
456
457 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
458 flags);
459 if (nlh == NULL)
460 return -EMSGSIZE;
461
462 ncm = nlmsg_data(nlh);
463 ncm->ncm_family = AF_INET6;
464
465 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
466 goto nla_put_failure;
467
468 /* type -1 is used for ALL */
469 if ((type == -1 || type == NETCONFA_FORWARDING) &&
470 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
471 goto nla_put_failure;
472 #ifdef CONFIG_IPV6_MROUTE
473 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
474 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
475 devconf->mc_forwarding) < 0)
476 goto nla_put_failure;
477 #endif
478 return nlmsg_end(skb, nlh);
479
480 nla_put_failure:
481 nlmsg_cancel(skb, nlh);
482 return -EMSGSIZE;
483 }
484
485 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
486 struct ipv6_devconf *devconf)
487 {
488 struct sk_buff *skb;
489 int err = -ENOBUFS;
490
491 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
492 if (skb == NULL)
493 goto errout;
494
495 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
496 RTM_NEWNETCONF, 0, type);
497 if (err < 0) {
498 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
499 WARN_ON(err == -EMSGSIZE);
500 kfree_skb(skb);
501 goto errout;
502 }
503 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
504 return;
505 errout:
506 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
507 }
508
509 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
510 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
511 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
512 };
513
514 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
515 struct nlmsghdr *nlh)
516 {
517 struct net *net = sock_net(in_skb->sk);
518 struct nlattr *tb[NETCONFA_MAX+1];
519 struct netconfmsg *ncm;
520 struct sk_buff *skb;
521 struct ipv6_devconf *devconf;
522 struct inet6_dev *in6_dev;
523 struct net_device *dev;
524 int ifindex;
525 int err;
526
527 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
528 devconf_ipv6_policy);
529 if (err < 0)
530 goto errout;
531
532 err = EINVAL;
533 if (!tb[NETCONFA_IFINDEX])
534 goto errout;
535
536 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
537 switch (ifindex) {
538 case NETCONFA_IFINDEX_ALL:
539 devconf = net->ipv6.devconf_all;
540 break;
541 case NETCONFA_IFINDEX_DEFAULT:
542 devconf = net->ipv6.devconf_dflt;
543 break;
544 default:
545 dev = __dev_get_by_index(net, ifindex);
546 if (dev == NULL)
547 goto errout;
548 in6_dev = __in6_dev_get(dev);
549 if (in6_dev == NULL)
550 goto errout;
551 devconf = &in6_dev->cnf;
552 break;
553 }
554
555 err = -ENOBUFS;
556 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
557 if (skb == NULL)
558 goto errout;
559
560 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
561 NETLINK_CB(in_skb).portid,
562 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
563 -1);
564 if (err < 0) {
565 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
566 WARN_ON(err == -EMSGSIZE);
567 kfree_skb(skb);
568 goto errout;
569 }
570 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
571 errout:
572 return err;
573 }
574
575 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
576 struct netlink_callback *cb)
577 {
578 struct net *net = sock_net(skb->sk);
579 int h, s_h;
580 int idx, s_idx;
581 struct net_device *dev;
582 struct inet6_dev *idev;
583 struct hlist_head *head;
584
585 s_h = cb->args[0];
586 s_idx = idx = cb->args[1];
587
588 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
589 idx = 0;
590 head = &net->dev_index_head[h];
591 rcu_read_lock();
592 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
593 net->dev_base_seq;
594 hlist_for_each_entry_rcu(dev, head, index_hlist) {
595 if (idx < s_idx)
596 goto cont;
597 idev = __in6_dev_get(dev);
598 if (!idev)
599 goto cont;
600
601 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
602 &idev->cnf,
603 NETLINK_CB(cb->skb).portid,
604 cb->nlh->nlmsg_seq,
605 RTM_NEWNETCONF,
606 NLM_F_MULTI,
607 -1) <= 0) {
608 rcu_read_unlock();
609 goto done;
610 }
611 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
612 cont:
613 idx++;
614 }
615 rcu_read_unlock();
616 }
617 if (h == NETDEV_HASHENTRIES) {
618 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
619 net->ipv6.devconf_all,
620 NETLINK_CB(cb->skb).portid,
621 cb->nlh->nlmsg_seq,
622 RTM_NEWNETCONF, NLM_F_MULTI,
623 -1) <= 0)
624 goto done;
625 else
626 h++;
627 }
628 if (h == NETDEV_HASHENTRIES + 1) {
629 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
630 net->ipv6.devconf_dflt,
631 NETLINK_CB(cb->skb).portid,
632 cb->nlh->nlmsg_seq,
633 RTM_NEWNETCONF, NLM_F_MULTI,
634 -1) <= 0)
635 goto done;
636 else
637 h++;
638 }
639 done:
640 cb->args[0] = h;
641 cb->args[1] = idx;
642
643 return skb->len;
644 }
645
646 #ifdef CONFIG_SYSCTL
647 static void dev_forward_change(struct inet6_dev *idev)
648 {
649 struct net_device *dev;
650 struct inet6_ifaddr *ifa;
651
652 if (!idev)
653 return;
654 dev = idev->dev;
655 if (idev->cnf.forwarding)
656 dev_disable_lro(dev);
657 if (dev->flags & IFF_MULTICAST) {
658 if (idev->cnf.forwarding) {
659 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
660 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
661 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
662 } else {
663 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
664 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
665 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
666 }
667 }
668
669 list_for_each_entry(ifa, &idev->addr_list, if_list) {
670 if (ifa->flags&IFA_F_TENTATIVE)
671 continue;
672 if (idev->cnf.forwarding)
673 addrconf_join_anycast(ifa);
674 else
675 addrconf_leave_anycast(ifa);
676 }
677 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
678 dev->ifindex, &idev->cnf);
679 }
680
681
682 static void addrconf_forward_change(struct net *net, __s32 newf)
683 {
684 struct net_device *dev;
685 struct inet6_dev *idev;
686
687 for_each_netdev(net, dev) {
688 idev = __in6_dev_get(dev);
689 if (idev) {
690 int changed = (!idev->cnf.forwarding) ^ (!newf);
691 idev->cnf.forwarding = newf;
692 if (changed)
693 dev_forward_change(idev);
694 }
695 }
696 }
697
698 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
699 {
700 struct net *net;
701 int old;
702
703 if (!rtnl_trylock())
704 return restart_syscall();
705
706 net = (struct net *)table->extra2;
707 old = *p;
708 *p = newf;
709
710 if (p == &net->ipv6.devconf_dflt->forwarding) {
711 if ((!newf) ^ (!old))
712 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
713 NETCONFA_IFINDEX_DEFAULT,
714 net->ipv6.devconf_dflt);
715 rtnl_unlock();
716 return 0;
717 }
718
719 if (p == &net->ipv6.devconf_all->forwarding) {
720 net->ipv6.devconf_dflt->forwarding = newf;
721 addrconf_forward_change(net, newf);
722 if ((!newf) ^ (!old))
723 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
724 NETCONFA_IFINDEX_ALL,
725 net->ipv6.devconf_all);
726 } else if ((!newf) ^ (!old))
727 dev_forward_change((struct inet6_dev *)table->extra1);
728 rtnl_unlock();
729
730 if (newf)
731 rt6_purge_dflt_routers(net);
732 return 1;
733 }
734 #endif
735
736 /* Nobody refers to this ifaddr, destroy it */
737 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
738 {
739 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
740
741 #ifdef NET_REFCNT_DEBUG
742 pr_debug("%s\n", __func__);
743 #endif
744
745 in6_dev_put(ifp->idev);
746
747 if (del_timer(&ifp->dad_timer))
748 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
749
750 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
751 pr_warn("Freeing alive inet6 address %p\n", ifp);
752 return;
753 }
754 ip6_rt_put(ifp->rt);
755
756 kfree_rcu(ifp, rcu);
757 }
758
759 static void
760 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
761 {
762 struct list_head *p;
763 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
764
765 /*
766 * Each device address list is sorted in order of scope -
767 * global before linklocal.
768 */
769 list_for_each(p, &idev->addr_list) {
770 struct inet6_ifaddr *ifa
771 = list_entry(p, struct inet6_ifaddr, if_list);
772 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
773 break;
774 }
775
776 list_add_tail(&ifp->if_list, p);
777 }
778
779 static u32 inet6_addr_hash(const struct in6_addr *addr)
780 {
781 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
782 }
783
784 /* On success it returns ifp with increased reference count */
785
786 static struct inet6_ifaddr *
787 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
788 const struct in6_addr *peer_addr, int pfxlen,
789 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
790 {
791 struct inet6_ifaddr *ifa = NULL;
792 struct rt6_info *rt;
793 unsigned int hash;
794 int err = 0;
795 int addr_type = ipv6_addr_type(addr);
796
797 if (addr_type == IPV6_ADDR_ANY ||
798 addr_type & IPV6_ADDR_MULTICAST ||
799 (!(idev->dev->flags & IFF_LOOPBACK) &&
800 addr_type & IPV6_ADDR_LOOPBACK))
801 return ERR_PTR(-EADDRNOTAVAIL);
802
803 rcu_read_lock_bh();
804 if (idev->dead) {
805 err = -ENODEV; /*XXX*/
806 goto out2;
807 }
808
809 if (idev->cnf.disable_ipv6) {
810 err = -EACCES;
811 goto out2;
812 }
813
814 spin_lock(&addrconf_hash_lock);
815
816 /* Ignore adding duplicate addresses on an interface */
817 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
818 ADBG("ipv6_add_addr: already assigned\n");
819 err = -EEXIST;
820 goto out;
821 }
822
823 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
824
825 if (ifa == NULL) {
826 ADBG("ipv6_add_addr: malloc failed\n");
827 err = -ENOBUFS;
828 goto out;
829 }
830
831 rt = addrconf_dst_alloc(idev, addr, false);
832 if (IS_ERR(rt)) {
833 err = PTR_ERR(rt);
834 goto out;
835 }
836
837 ifa->addr = *addr;
838 if (peer_addr)
839 ifa->peer_addr = *peer_addr;
840
841 spin_lock_init(&ifa->lock);
842 spin_lock_init(&ifa->state_lock);
843 setup_timer(&ifa->dad_timer, addrconf_dad_timer,
844 (unsigned long)ifa);
845 INIT_HLIST_NODE(&ifa->addr_lst);
846 ifa->scope = scope;
847 ifa->prefix_len = pfxlen;
848 ifa->flags = flags | IFA_F_TENTATIVE;
849 ifa->valid_lft = valid_lft;
850 ifa->prefered_lft = prefered_lft;
851 ifa->cstamp = ifa->tstamp = jiffies;
852 ifa->tokenized = false;
853
854 ifa->rt = rt;
855
856 ifa->idev = idev;
857 in6_dev_hold(idev);
858 /* For caller */
859 in6_ifa_hold(ifa);
860
861 /* Add to big hash table */
862 hash = inet6_addr_hash(addr);
863
864 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
865 spin_unlock(&addrconf_hash_lock);
866
867 write_lock(&idev->lock);
868 /* Add to inet6_dev unicast addr list. */
869 ipv6_link_dev_addr(idev, ifa);
870
871 if (ifa->flags&IFA_F_TEMPORARY) {
872 list_add(&ifa->tmp_list, &idev->tempaddr_list);
873 in6_ifa_hold(ifa);
874 }
875
876 in6_ifa_hold(ifa);
877 write_unlock(&idev->lock);
878 out2:
879 rcu_read_unlock_bh();
880
881 if (likely(err == 0))
882 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
883 else {
884 kfree(ifa);
885 ifa = ERR_PTR(err);
886 }
887
888 return ifa;
889 out:
890 spin_unlock(&addrconf_hash_lock);
891 goto out2;
892 }
893
894 /* This function wants to get referenced ifp and releases it before return */
895
896 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
897 {
898 struct inet6_ifaddr *ifa, *ifn;
899 struct inet6_dev *idev = ifp->idev;
900 int state;
901 int deleted = 0, onlink = 0;
902 unsigned long expires = jiffies;
903
904 spin_lock_bh(&ifp->state_lock);
905 state = ifp->state;
906 ifp->state = INET6_IFADDR_STATE_DEAD;
907 spin_unlock_bh(&ifp->state_lock);
908
909 if (state == INET6_IFADDR_STATE_DEAD)
910 goto out;
911
912 spin_lock_bh(&addrconf_hash_lock);
913 hlist_del_init_rcu(&ifp->addr_lst);
914 spin_unlock_bh(&addrconf_hash_lock);
915
916 write_lock_bh(&idev->lock);
917
918 if (ifp->flags&IFA_F_TEMPORARY) {
919 list_del(&ifp->tmp_list);
920 if (ifp->ifpub) {
921 in6_ifa_put(ifp->ifpub);
922 ifp->ifpub = NULL;
923 }
924 __in6_ifa_put(ifp);
925 }
926
927 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
928 if (ifa == ifp) {
929 list_del_init(&ifp->if_list);
930 __in6_ifa_put(ifp);
931
932 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
933 break;
934 deleted = 1;
935 continue;
936 } else if (ifp->flags & IFA_F_PERMANENT) {
937 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
938 ifp->prefix_len)) {
939 if (ifa->flags & IFA_F_PERMANENT) {
940 onlink = 1;
941 if (deleted)
942 break;
943 } else {
944 unsigned long lifetime;
945
946 if (!onlink)
947 onlink = -1;
948
949 spin_lock(&ifa->lock);
950
951 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
952 /*
953 * Note: Because this address is
954 * not permanent, lifetime <
955 * LONG_MAX / HZ here.
956 */
957 if (time_before(expires,
958 ifa->tstamp + lifetime * HZ))
959 expires = ifa->tstamp + lifetime * HZ;
960 spin_unlock(&ifa->lock);
961 }
962 }
963 }
964 }
965 write_unlock_bh(&idev->lock);
966
967 addrconf_del_dad_timer(ifp);
968
969 ipv6_ifa_notify(RTM_DELADDR, ifp);
970
971 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
972
973 /*
974 * Purge or update corresponding prefix
975 *
976 * 1) we don't purge prefix here if address was not permanent.
977 * prefix is managed by its own lifetime.
978 * 2) if there're no addresses, delete prefix.
979 * 3) if there're still other permanent address(es),
980 * corresponding prefix is still permanent.
981 * 4) otherwise, update prefix lifetime to the
982 * longest valid lifetime among the corresponding
983 * addresses on the device.
984 * Note: subsequent RA will update lifetime.
985 *
986 * --yoshfuji
987 */
988 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
989 struct in6_addr prefix;
990 struct rt6_info *rt;
991
992 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
993
994 rt = addrconf_get_prefix_route(&prefix,
995 ifp->prefix_len,
996 ifp->idev->dev,
997 0, RTF_GATEWAY | RTF_DEFAULT);
998
999 if (rt) {
1000 if (onlink == 0) {
1001 ip6_del_rt(rt);
1002 rt = NULL;
1003 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1004 rt6_set_expires(rt, expires);
1005 }
1006 }
1007 ip6_rt_put(rt);
1008 }
1009
1010 /* clean up prefsrc entries */
1011 rt6_remove_prefsrc(ifp);
1012 out:
1013 in6_ifa_put(ifp);
1014 }
1015
1016 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1017 {
1018 struct inet6_dev *idev = ifp->idev;
1019 struct in6_addr addr, *tmpaddr;
1020 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1021 unsigned long regen_advance;
1022 int tmp_plen;
1023 int ret = 0;
1024 u32 addr_flags;
1025 unsigned long now = jiffies;
1026
1027 write_lock(&idev->lock);
1028 if (ift) {
1029 spin_lock_bh(&ift->lock);
1030 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1031 spin_unlock_bh(&ift->lock);
1032 tmpaddr = &addr;
1033 } else {
1034 tmpaddr = NULL;
1035 }
1036 retry:
1037 in6_dev_hold(idev);
1038 if (idev->cnf.use_tempaddr <= 0) {
1039 write_unlock(&idev->lock);
1040 pr_info("%s: use_tempaddr is disabled\n", __func__);
1041 in6_dev_put(idev);
1042 ret = -1;
1043 goto out;
1044 }
1045 spin_lock_bh(&ifp->lock);
1046 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1047 idev->cnf.use_tempaddr = -1; /*XXX*/
1048 spin_unlock_bh(&ifp->lock);
1049 write_unlock(&idev->lock);
1050 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1051 __func__);
1052 in6_dev_put(idev);
1053 ret = -1;
1054 goto out;
1055 }
1056 in6_ifa_hold(ifp);
1057 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1058 __ipv6_try_regen_rndid(idev, tmpaddr);
1059 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1060 age = (now - ifp->tstamp) / HZ;
1061 tmp_valid_lft = min_t(__u32,
1062 ifp->valid_lft,
1063 idev->cnf.temp_valid_lft + age);
1064 tmp_prefered_lft = min_t(__u32,
1065 ifp->prefered_lft,
1066 idev->cnf.temp_prefered_lft + age -
1067 idev->cnf.max_desync_factor);
1068 tmp_plen = ifp->prefix_len;
1069 tmp_tstamp = ifp->tstamp;
1070 spin_unlock_bh(&ifp->lock);
1071
1072 regen_advance = idev->cnf.regen_max_retry *
1073 idev->cnf.dad_transmits *
1074 idev->nd_parms->retrans_time / HZ;
1075 write_unlock(&idev->lock);
1076
1077 /* A temporary address is created only if this calculated Preferred
1078 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1079 * an implementation must not create a temporary address with a zero
1080 * Preferred Lifetime.
1081 */
1082 if (tmp_prefered_lft <= regen_advance) {
1083 in6_ifa_put(ifp);
1084 in6_dev_put(idev);
1085 ret = -1;
1086 goto out;
1087 }
1088
1089 addr_flags = IFA_F_TEMPORARY;
1090 /* set in addrconf_prefix_rcv() */
1091 if (ifp->flags & IFA_F_OPTIMISTIC)
1092 addr_flags |= IFA_F_OPTIMISTIC;
1093
1094 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1095 ipv6_addr_scope(&addr), addr_flags,
1096 tmp_valid_lft, tmp_prefered_lft);
1097 if (IS_ERR(ift)) {
1098 in6_ifa_put(ifp);
1099 in6_dev_put(idev);
1100 pr_info("%s: retry temporary address regeneration\n", __func__);
1101 tmpaddr = &addr;
1102 write_lock(&idev->lock);
1103 goto retry;
1104 }
1105
1106 spin_lock_bh(&ift->lock);
1107 ift->ifpub = ifp;
1108 ift->cstamp = now;
1109 ift->tstamp = tmp_tstamp;
1110 spin_unlock_bh(&ift->lock);
1111
1112 addrconf_dad_start(ift);
1113 in6_ifa_put(ift);
1114 in6_dev_put(idev);
1115 out:
1116 return ret;
1117 }
1118
1119 /*
1120 * Choose an appropriate source address (RFC3484)
1121 */
1122 enum {
1123 IPV6_SADDR_RULE_INIT = 0,
1124 IPV6_SADDR_RULE_LOCAL,
1125 IPV6_SADDR_RULE_SCOPE,
1126 IPV6_SADDR_RULE_PREFERRED,
1127 #ifdef CONFIG_IPV6_MIP6
1128 IPV6_SADDR_RULE_HOA,
1129 #endif
1130 IPV6_SADDR_RULE_OIF,
1131 IPV6_SADDR_RULE_LABEL,
1132 IPV6_SADDR_RULE_PRIVACY,
1133 IPV6_SADDR_RULE_ORCHID,
1134 IPV6_SADDR_RULE_PREFIX,
1135 IPV6_SADDR_RULE_MAX
1136 };
1137
1138 struct ipv6_saddr_score {
1139 int rule;
1140 int addr_type;
1141 struct inet6_ifaddr *ifa;
1142 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1143 int scopedist;
1144 int matchlen;
1145 };
1146
1147 struct ipv6_saddr_dst {
1148 const struct in6_addr *addr;
1149 int ifindex;
1150 int scope;
1151 int label;
1152 unsigned int prefs;
1153 };
1154
1155 static inline int ipv6_saddr_preferred(int type)
1156 {
1157 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1158 return 1;
1159 return 0;
1160 }
1161
1162 static int ipv6_get_saddr_eval(struct net *net,
1163 struct ipv6_saddr_score *score,
1164 struct ipv6_saddr_dst *dst,
1165 int i)
1166 {
1167 int ret;
1168
1169 if (i <= score->rule) {
1170 switch (i) {
1171 case IPV6_SADDR_RULE_SCOPE:
1172 ret = score->scopedist;
1173 break;
1174 case IPV6_SADDR_RULE_PREFIX:
1175 ret = score->matchlen;
1176 break;
1177 default:
1178 ret = !!test_bit(i, score->scorebits);
1179 }
1180 goto out;
1181 }
1182
1183 switch (i) {
1184 case IPV6_SADDR_RULE_INIT:
1185 /* Rule 0: remember if hiscore is not ready yet */
1186 ret = !!score->ifa;
1187 break;
1188 case IPV6_SADDR_RULE_LOCAL:
1189 /* Rule 1: Prefer same address */
1190 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1191 break;
1192 case IPV6_SADDR_RULE_SCOPE:
1193 /* Rule 2: Prefer appropriate scope
1194 *
1195 * ret
1196 * ^
1197 * -1 | d 15
1198 * ---+--+-+---> scope
1199 * |
1200 * | d is scope of the destination.
1201 * B-d | \
1202 * | \ <- smaller scope is better if
1203 * B-15 | \ if scope is enough for destinaion.
1204 * | ret = B - scope (-1 <= scope >= d <= 15).
1205 * d-C-1 | /
1206 * |/ <- greater is better
1207 * -C / if scope is not enough for destination.
1208 * /| ret = scope - C (-1 <= d < scope <= 15).
1209 *
1210 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1211 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1212 * Assume B = 0 and we get C > 29.
1213 */
1214 ret = __ipv6_addr_src_scope(score->addr_type);
1215 if (ret >= dst->scope)
1216 ret = -ret;
1217 else
1218 ret -= 128; /* 30 is enough */
1219 score->scopedist = ret;
1220 break;
1221 case IPV6_SADDR_RULE_PREFERRED:
1222 /* Rule 3: Avoid deprecated and optimistic addresses */
1223 ret = ipv6_saddr_preferred(score->addr_type) ||
1224 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1225 break;
1226 #ifdef CONFIG_IPV6_MIP6
1227 case IPV6_SADDR_RULE_HOA:
1228 {
1229 /* Rule 4: Prefer home address */
1230 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1231 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1232 break;
1233 }
1234 #endif
1235 case IPV6_SADDR_RULE_OIF:
1236 /* Rule 5: Prefer outgoing interface */
1237 ret = (!dst->ifindex ||
1238 dst->ifindex == score->ifa->idev->dev->ifindex);
1239 break;
1240 case IPV6_SADDR_RULE_LABEL:
1241 /* Rule 6: Prefer matching label */
1242 ret = ipv6_addr_label(net,
1243 &score->ifa->addr, score->addr_type,
1244 score->ifa->idev->dev->ifindex) == dst->label;
1245 break;
1246 case IPV6_SADDR_RULE_PRIVACY:
1247 {
1248 /* Rule 7: Prefer public address
1249 * Note: prefer temporary address if use_tempaddr >= 2
1250 */
1251 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1252 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1253 score->ifa->idev->cnf.use_tempaddr >= 2;
1254 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1255 break;
1256 }
1257 case IPV6_SADDR_RULE_ORCHID:
1258 /* Rule 8-: Prefer ORCHID vs ORCHID or
1259 * non-ORCHID vs non-ORCHID
1260 */
1261 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1262 ipv6_addr_orchid(dst->addr));
1263 break;
1264 case IPV6_SADDR_RULE_PREFIX:
1265 /* Rule 8: Use longest matching prefix */
1266 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1267 if (ret > score->ifa->prefix_len)
1268 ret = score->ifa->prefix_len;
1269 score->matchlen = ret;
1270 break;
1271 default:
1272 ret = 0;
1273 }
1274
1275 if (ret)
1276 __set_bit(i, score->scorebits);
1277 score->rule = i;
1278 out:
1279 return ret;
1280 }
1281
1282 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1283 const struct in6_addr *daddr, unsigned int prefs,
1284 struct in6_addr *saddr)
1285 {
1286 struct ipv6_saddr_score scores[2],
1287 *score = &scores[0], *hiscore = &scores[1];
1288 struct ipv6_saddr_dst dst;
1289 struct net_device *dev;
1290 int dst_type;
1291
1292 dst_type = __ipv6_addr_type(daddr);
1293 dst.addr = daddr;
1294 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1295 dst.scope = __ipv6_addr_src_scope(dst_type);
1296 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1297 dst.prefs = prefs;
1298
1299 hiscore->rule = -1;
1300 hiscore->ifa = NULL;
1301
1302 rcu_read_lock();
1303
1304 for_each_netdev_rcu(net, dev) {
1305 struct inet6_dev *idev;
1306
1307 /* Candidate Source Address (section 4)
1308 * - multicast and link-local destination address,
1309 * the set of candidate source address MUST only
1310 * include addresses assigned to interfaces
1311 * belonging to the same link as the outgoing
1312 * interface.
1313 * (- For site-local destination addresses, the
1314 * set of candidate source addresses MUST only
1315 * include addresses assigned to interfaces
1316 * belonging to the same site as the outgoing
1317 * interface.)
1318 */
1319 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1320 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1321 dst.ifindex && dev->ifindex != dst.ifindex)
1322 continue;
1323
1324 idev = __in6_dev_get(dev);
1325 if (!idev)
1326 continue;
1327
1328 read_lock_bh(&idev->lock);
1329 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1330 int i;
1331
1332 /*
1333 * - Tentative Address (RFC2462 section 5.4)
1334 * - A tentative address is not considered
1335 * "assigned to an interface" in the traditional
1336 * sense, unless it is also flagged as optimistic.
1337 * - Candidate Source Address (section 4)
1338 * - In any case, anycast addresses, multicast
1339 * addresses, and the unspecified address MUST
1340 * NOT be included in a candidate set.
1341 */
1342 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1343 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1344 continue;
1345
1346 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1347
1348 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1349 score->addr_type & IPV6_ADDR_MULTICAST)) {
1350 LIMIT_NETDEBUG(KERN_DEBUG
1351 "ADDRCONF: unspecified / multicast address "
1352 "assigned as unicast address on %s",
1353 dev->name);
1354 continue;
1355 }
1356
1357 score->rule = -1;
1358 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1359
1360 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1361 int minihiscore, miniscore;
1362
1363 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1364 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1365
1366 if (minihiscore > miniscore) {
1367 if (i == IPV6_SADDR_RULE_SCOPE &&
1368 score->scopedist > 0) {
1369 /*
1370 * special case:
1371 * each remaining entry
1372 * has too small (not enough)
1373 * scope, because ifa entries
1374 * are sorted by their scope
1375 * values.
1376 */
1377 goto try_nextdev;
1378 }
1379 break;
1380 } else if (minihiscore < miniscore) {
1381 if (hiscore->ifa)
1382 in6_ifa_put(hiscore->ifa);
1383
1384 in6_ifa_hold(score->ifa);
1385
1386 swap(hiscore, score);
1387
1388 /* restore our iterator */
1389 score->ifa = hiscore->ifa;
1390
1391 break;
1392 }
1393 }
1394 }
1395 try_nextdev:
1396 read_unlock_bh(&idev->lock);
1397 }
1398 rcu_read_unlock();
1399
1400 if (!hiscore->ifa)
1401 return -EADDRNOTAVAIL;
1402
1403 *saddr = hiscore->ifa->addr;
1404 in6_ifa_put(hiscore->ifa);
1405 return 0;
1406 }
1407 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1408
1409 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1410 unsigned char banned_flags)
1411 {
1412 struct inet6_ifaddr *ifp;
1413 int err = -EADDRNOTAVAIL;
1414
1415 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1416 if (ifp->scope == IFA_LINK &&
1417 !(ifp->flags & banned_flags)) {
1418 *addr = ifp->addr;
1419 err = 0;
1420 break;
1421 }
1422 }
1423 return err;
1424 }
1425
1426 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1427 unsigned char banned_flags)
1428 {
1429 struct inet6_dev *idev;
1430 int err = -EADDRNOTAVAIL;
1431
1432 rcu_read_lock();
1433 idev = __in6_dev_get(dev);
1434 if (idev) {
1435 read_lock_bh(&idev->lock);
1436 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1437 read_unlock_bh(&idev->lock);
1438 }
1439 rcu_read_unlock();
1440 return err;
1441 }
1442
1443 static int ipv6_count_addresses(struct inet6_dev *idev)
1444 {
1445 int cnt = 0;
1446 struct inet6_ifaddr *ifp;
1447
1448 read_lock_bh(&idev->lock);
1449 list_for_each_entry(ifp, &idev->addr_list, if_list)
1450 cnt++;
1451 read_unlock_bh(&idev->lock);
1452 return cnt;
1453 }
1454
1455 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1456 const struct net_device *dev, int strict)
1457 {
1458 struct inet6_ifaddr *ifp;
1459 unsigned int hash = inet6_addr_hash(addr);
1460
1461 rcu_read_lock_bh();
1462 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1463 if (!net_eq(dev_net(ifp->idev->dev), net))
1464 continue;
1465 if (ipv6_addr_equal(&ifp->addr, addr) &&
1466 !(ifp->flags&IFA_F_TENTATIVE) &&
1467 (dev == NULL || ifp->idev->dev == dev ||
1468 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1469 rcu_read_unlock_bh();
1470 return 1;
1471 }
1472 }
1473
1474 rcu_read_unlock_bh();
1475 return 0;
1476 }
1477 EXPORT_SYMBOL(ipv6_chk_addr);
1478
1479 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1480 struct net_device *dev)
1481 {
1482 unsigned int hash = inet6_addr_hash(addr);
1483 struct inet6_ifaddr *ifp;
1484
1485 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1486 if (!net_eq(dev_net(ifp->idev->dev), net))
1487 continue;
1488 if (ipv6_addr_equal(&ifp->addr, addr)) {
1489 if (dev == NULL || ifp->idev->dev == dev)
1490 return true;
1491 }
1492 }
1493 return false;
1494 }
1495
1496 /* Compares an address/prefix_len with addresses on device @dev.
1497 * If one is found it returns true.
1498 */
1499 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1500 const unsigned int prefix_len, struct net_device *dev)
1501 {
1502 struct inet6_dev *idev;
1503 struct inet6_ifaddr *ifa;
1504 bool ret = false;
1505
1506 rcu_read_lock();
1507 idev = __in6_dev_get(dev);
1508 if (idev) {
1509 read_lock_bh(&idev->lock);
1510 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1511 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1512 if (ret)
1513 break;
1514 }
1515 read_unlock_bh(&idev->lock);
1516 }
1517 rcu_read_unlock();
1518
1519 return ret;
1520 }
1521 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1522
1523 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1524 {
1525 struct inet6_dev *idev;
1526 struct inet6_ifaddr *ifa;
1527 int onlink;
1528
1529 onlink = 0;
1530 rcu_read_lock();
1531 idev = __in6_dev_get(dev);
1532 if (idev) {
1533 read_lock_bh(&idev->lock);
1534 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1535 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1536 ifa->prefix_len);
1537 if (onlink)
1538 break;
1539 }
1540 read_unlock_bh(&idev->lock);
1541 }
1542 rcu_read_unlock();
1543 return onlink;
1544 }
1545 EXPORT_SYMBOL(ipv6_chk_prefix);
1546
1547 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1548 struct net_device *dev, int strict)
1549 {
1550 struct inet6_ifaddr *ifp, *result = NULL;
1551 unsigned int hash = inet6_addr_hash(addr);
1552
1553 rcu_read_lock_bh();
1554 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1555 if (!net_eq(dev_net(ifp->idev->dev), net))
1556 continue;
1557 if (ipv6_addr_equal(&ifp->addr, addr)) {
1558 if (dev == NULL || ifp->idev->dev == dev ||
1559 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1560 result = ifp;
1561 in6_ifa_hold(ifp);
1562 break;
1563 }
1564 }
1565 }
1566 rcu_read_unlock_bh();
1567
1568 return result;
1569 }
1570
1571 /* Gets referenced address, destroys ifaddr */
1572
1573 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1574 {
1575 if (ifp->flags&IFA_F_PERMANENT) {
1576 spin_lock_bh(&ifp->lock);
1577 addrconf_del_dad_timer(ifp);
1578 ifp->flags |= IFA_F_TENTATIVE;
1579 if (dad_failed)
1580 ifp->flags |= IFA_F_DADFAILED;
1581 spin_unlock_bh(&ifp->lock);
1582 if (dad_failed)
1583 ipv6_ifa_notify(0, ifp);
1584 in6_ifa_put(ifp);
1585 } else if (ifp->flags&IFA_F_TEMPORARY) {
1586 struct inet6_ifaddr *ifpub;
1587 spin_lock_bh(&ifp->lock);
1588 ifpub = ifp->ifpub;
1589 if (ifpub) {
1590 in6_ifa_hold(ifpub);
1591 spin_unlock_bh(&ifp->lock);
1592 ipv6_create_tempaddr(ifpub, ifp);
1593 in6_ifa_put(ifpub);
1594 } else {
1595 spin_unlock_bh(&ifp->lock);
1596 }
1597 ipv6_del_addr(ifp);
1598 } else
1599 ipv6_del_addr(ifp);
1600 }
1601
1602 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1603 {
1604 int err = -ENOENT;
1605
1606 spin_lock(&ifp->state_lock);
1607 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1608 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1609 err = 0;
1610 }
1611 spin_unlock(&ifp->state_lock);
1612
1613 return err;
1614 }
1615
1616 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1617 {
1618 struct inet6_dev *idev = ifp->idev;
1619
1620 if (addrconf_dad_end(ifp)) {
1621 in6_ifa_put(ifp);
1622 return;
1623 }
1624
1625 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1626 ifp->idev->dev->name, &ifp->addr);
1627
1628 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1629 struct in6_addr addr;
1630
1631 addr.s6_addr32[0] = htonl(0xfe800000);
1632 addr.s6_addr32[1] = 0;
1633
1634 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1635 ipv6_addr_equal(&ifp->addr, &addr)) {
1636 /* DAD failed for link-local based on MAC address */
1637 idev->cnf.disable_ipv6 = 1;
1638
1639 pr_info("%s: IPv6 being disabled!\n",
1640 ifp->idev->dev->name);
1641 }
1642 }
1643
1644 addrconf_dad_stop(ifp, 1);
1645 }
1646
1647 /* Join to solicited addr multicast group. */
1648
1649 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1650 {
1651 struct in6_addr maddr;
1652
1653 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1654 return;
1655
1656 addrconf_addr_solict_mult(addr, &maddr);
1657 ipv6_dev_mc_inc(dev, &maddr);
1658 }
1659
1660 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1661 {
1662 struct in6_addr maddr;
1663
1664 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1665 return;
1666
1667 addrconf_addr_solict_mult(addr, &maddr);
1668 __ipv6_dev_mc_dec(idev, &maddr);
1669 }
1670
1671 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1672 {
1673 struct in6_addr addr;
1674 if (ifp->prefix_len == 127) /* RFC 6164 */
1675 return;
1676 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1677 if (ipv6_addr_any(&addr))
1678 return;
1679 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1680 }
1681
1682 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1683 {
1684 struct in6_addr addr;
1685 if (ifp->prefix_len == 127) /* RFC 6164 */
1686 return;
1687 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1688 if (ipv6_addr_any(&addr))
1689 return;
1690 __ipv6_dev_ac_dec(ifp->idev, &addr);
1691 }
1692
1693 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1694 {
1695 if (dev->addr_len != ETH_ALEN)
1696 return -1;
1697 memcpy(eui, dev->dev_addr, 3);
1698 memcpy(eui + 5, dev->dev_addr + 3, 3);
1699
1700 /*
1701 * The zSeries OSA network cards can be shared among various
1702 * OS instances, but the OSA cards have only one MAC address.
1703 * This leads to duplicate address conflicts in conjunction
1704 * with IPv6 if more than one instance uses the same card.
1705 *
1706 * The driver for these cards can deliver a unique 16-bit
1707 * identifier for each instance sharing the same card. It is
1708 * placed instead of 0xFFFE in the interface identifier. The
1709 * "u" bit of the interface identifier is not inverted in this
1710 * case. Hence the resulting interface identifier has local
1711 * scope according to RFC2373.
1712 */
1713 if (dev->dev_id) {
1714 eui[3] = (dev->dev_id >> 8) & 0xFF;
1715 eui[4] = dev->dev_id & 0xFF;
1716 } else {
1717 eui[3] = 0xFF;
1718 eui[4] = 0xFE;
1719 eui[0] ^= 2;
1720 }
1721 return 0;
1722 }
1723
1724 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1725 {
1726 if (dev->addr_len != IEEE802154_ADDR_LEN)
1727 return -1;
1728 memcpy(eui, dev->dev_addr, 8);
1729 eui[0] ^= 2;
1730 return 0;
1731 }
1732
1733 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1734 {
1735 union fwnet_hwaddr *ha;
1736
1737 if (dev->addr_len != FWNET_ALEN)
1738 return -1;
1739
1740 ha = (union fwnet_hwaddr *)dev->dev_addr;
1741
1742 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1743 eui[0] ^= 2;
1744 return 0;
1745 }
1746
1747 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1748 {
1749 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1750 if (dev->addr_len != ARCNET_ALEN)
1751 return -1;
1752 memset(eui, 0, 7);
1753 eui[7] = *(u8 *)dev->dev_addr;
1754 return 0;
1755 }
1756
1757 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1758 {
1759 if (dev->addr_len != INFINIBAND_ALEN)
1760 return -1;
1761 memcpy(eui, dev->dev_addr + 12, 8);
1762 eui[0] |= 2;
1763 return 0;
1764 }
1765
1766 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1767 {
1768 if (addr == 0)
1769 return -1;
1770 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1771 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1772 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1773 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1774 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1775 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1776 eui[1] = 0;
1777 eui[2] = 0x5E;
1778 eui[3] = 0xFE;
1779 memcpy(eui + 4, &addr, 4);
1780 return 0;
1781 }
1782
1783 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1784 {
1785 if (dev->priv_flags & IFF_ISATAP)
1786 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1787 return -1;
1788 }
1789
1790 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1791 {
1792 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1793 }
1794
1795 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1796 {
1797 memcpy(eui, dev->perm_addr, 3);
1798 memcpy(eui + 5, dev->perm_addr + 3, 3);
1799 eui[3] = 0xFF;
1800 eui[4] = 0xFE;
1801 eui[0] ^= 2;
1802 return 0;
1803 }
1804
1805 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1806 {
1807 switch (dev->type) {
1808 case ARPHRD_ETHER:
1809 case ARPHRD_FDDI:
1810 return addrconf_ifid_eui48(eui, dev);
1811 case ARPHRD_ARCNET:
1812 return addrconf_ifid_arcnet(eui, dev);
1813 case ARPHRD_INFINIBAND:
1814 return addrconf_ifid_infiniband(eui, dev);
1815 case ARPHRD_SIT:
1816 return addrconf_ifid_sit(eui, dev);
1817 case ARPHRD_IPGRE:
1818 return addrconf_ifid_gre(eui, dev);
1819 case ARPHRD_6LOWPAN:
1820 case ARPHRD_IEEE802154:
1821 return addrconf_ifid_eui64(eui, dev);
1822 case ARPHRD_IEEE1394:
1823 return addrconf_ifid_ieee1394(eui, dev);
1824 case ARPHRD_TUNNEL6:
1825 return addrconf_ifid_ip6tnl(eui, dev);
1826 }
1827 return -1;
1828 }
1829
1830 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1831 {
1832 int err = -1;
1833 struct inet6_ifaddr *ifp;
1834
1835 read_lock_bh(&idev->lock);
1836 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1837 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1838 memcpy(eui, ifp->addr.s6_addr+8, 8);
1839 err = 0;
1840 break;
1841 }
1842 }
1843 read_unlock_bh(&idev->lock);
1844 return err;
1845 }
1846
1847 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1848 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1849 {
1850 regen:
1851 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1852 idev->rndid[0] &= ~0x02;
1853
1854 /*
1855 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1856 * check if generated address is not inappropriate
1857 *
1858 * - Reserved subnet anycast (RFC 2526)
1859 * 11111101 11....11 1xxxxxxx
1860 * - ISATAP (RFC4214) 6.1
1861 * 00-00-5E-FE-xx-xx-xx-xx
1862 * - value 0
1863 * - XXX: already assigned to an address on the device
1864 */
1865 if (idev->rndid[0] == 0xfd &&
1866 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1867 (idev->rndid[7]&0x80))
1868 goto regen;
1869 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1870 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1871 goto regen;
1872 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1873 goto regen;
1874 }
1875 }
1876
1877 static void ipv6_regen_rndid(unsigned long data)
1878 {
1879 struct inet6_dev *idev = (struct inet6_dev *) data;
1880 unsigned long expires;
1881
1882 rcu_read_lock_bh();
1883 write_lock_bh(&idev->lock);
1884
1885 if (idev->dead)
1886 goto out;
1887
1888 __ipv6_regen_rndid(idev);
1889
1890 expires = jiffies +
1891 idev->cnf.temp_prefered_lft * HZ -
1892 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1893 idev->cnf.max_desync_factor * HZ;
1894 if (time_before(expires, jiffies)) {
1895 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1896 __func__, idev->dev->name);
1897 goto out;
1898 }
1899
1900 if (!mod_timer(&idev->regen_timer, expires))
1901 in6_dev_hold(idev);
1902
1903 out:
1904 write_unlock_bh(&idev->lock);
1905 rcu_read_unlock_bh();
1906 in6_dev_put(idev);
1907 }
1908
1909 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1910 {
1911 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1912 __ipv6_regen_rndid(idev);
1913 }
1914
1915 /*
1916 * Add prefix route.
1917 */
1918
1919 static void
1920 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1921 unsigned long expires, u32 flags)
1922 {
1923 struct fib6_config cfg = {
1924 .fc_table = RT6_TABLE_PREFIX,
1925 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1926 .fc_ifindex = dev->ifindex,
1927 .fc_expires = expires,
1928 .fc_dst_len = plen,
1929 .fc_flags = RTF_UP | flags,
1930 .fc_nlinfo.nl_net = dev_net(dev),
1931 .fc_protocol = RTPROT_KERNEL,
1932 };
1933
1934 cfg.fc_dst = *pfx;
1935
1936 /* Prevent useless cloning on PtP SIT.
1937 This thing is done here expecting that the whole
1938 class of non-broadcast devices need not cloning.
1939 */
1940 #if IS_ENABLED(CONFIG_IPV6_SIT)
1941 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1942 cfg.fc_flags |= RTF_NONEXTHOP;
1943 #endif
1944
1945 ip6_route_add(&cfg);
1946 }
1947
1948
1949 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1950 int plen,
1951 const struct net_device *dev,
1952 u32 flags, u32 noflags)
1953 {
1954 struct fib6_node *fn;
1955 struct rt6_info *rt = NULL;
1956 struct fib6_table *table;
1957
1958 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1959 if (table == NULL)
1960 return NULL;
1961
1962 read_lock_bh(&table->tb6_lock);
1963 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1964 if (!fn)
1965 goto out;
1966 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1967 if (rt->dst.dev->ifindex != dev->ifindex)
1968 continue;
1969 if ((rt->rt6i_flags & flags) != flags)
1970 continue;
1971 if ((rt->rt6i_flags & noflags) != 0)
1972 continue;
1973 dst_hold(&rt->dst);
1974 break;
1975 }
1976 out:
1977 read_unlock_bh(&table->tb6_lock);
1978 return rt;
1979 }
1980
1981
1982 /* Create "default" multicast route to the interface */
1983
1984 static void addrconf_add_mroute(struct net_device *dev)
1985 {
1986 struct fib6_config cfg = {
1987 .fc_table = RT6_TABLE_LOCAL,
1988 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1989 .fc_ifindex = dev->ifindex,
1990 .fc_dst_len = 8,
1991 .fc_flags = RTF_UP,
1992 .fc_nlinfo.nl_net = dev_net(dev),
1993 };
1994
1995 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1996
1997 ip6_route_add(&cfg);
1998 }
1999
2000 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2001 {
2002 struct inet6_dev *idev;
2003
2004 ASSERT_RTNL();
2005
2006 idev = ipv6_find_idev(dev);
2007 if (!idev)
2008 return ERR_PTR(-ENOBUFS);
2009
2010 if (idev->cnf.disable_ipv6)
2011 return ERR_PTR(-EACCES);
2012
2013 /* Add default multicast route */
2014 if (!(dev->flags & IFF_LOOPBACK))
2015 addrconf_add_mroute(dev);
2016
2017 return idev;
2018 }
2019
2020 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2021 {
2022 struct prefix_info *pinfo;
2023 __u32 valid_lft;
2024 __u32 prefered_lft;
2025 int addr_type;
2026 struct inet6_dev *in6_dev;
2027 struct net *net = dev_net(dev);
2028
2029 pinfo = (struct prefix_info *) opt;
2030
2031 if (len < sizeof(struct prefix_info)) {
2032 ADBG("addrconf: prefix option too short\n");
2033 return;
2034 }
2035
2036 /*
2037 * Validation checks ([ADDRCONF], page 19)
2038 */
2039
2040 addr_type = ipv6_addr_type(&pinfo->prefix);
2041
2042 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2043 return;
2044
2045 valid_lft = ntohl(pinfo->valid);
2046 prefered_lft = ntohl(pinfo->prefered);
2047
2048 if (prefered_lft > valid_lft) {
2049 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2050 return;
2051 }
2052
2053 in6_dev = in6_dev_get(dev);
2054
2055 if (in6_dev == NULL) {
2056 net_dbg_ratelimited("addrconf: device %s not configured\n",
2057 dev->name);
2058 return;
2059 }
2060
2061 /*
2062 * Two things going on here:
2063 * 1) Add routes for on-link prefixes
2064 * 2) Configure prefixes with the auto flag set
2065 */
2066
2067 if (pinfo->onlink) {
2068 struct rt6_info *rt;
2069 unsigned long rt_expires;
2070
2071 /* Avoid arithmetic overflow. Really, we could
2072 * save rt_expires in seconds, likely valid_lft,
2073 * but it would require division in fib gc, that it
2074 * not good.
2075 */
2076 if (HZ > USER_HZ)
2077 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2078 else
2079 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2080
2081 if (addrconf_finite_timeout(rt_expires))
2082 rt_expires *= HZ;
2083
2084 rt = addrconf_get_prefix_route(&pinfo->prefix,
2085 pinfo->prefix_len,
2086 dev,
2087 RTF_ADDRCONF | RTF_PREFIX_RT,
2088 RTF_GATEWAY | RTF_DEFAULT);
2089
2090 if (rt) {
2091 /* Autoconf prefix route */
2092 if (valid_lft == 0) {
2093 ip6_del_rt(rt);
2094 rt = NULL;
2095 } else if (addrconf_finite_timeout(rt_expires)) {
2096 /* not infinity */
2097 rt6_set_expires(rt, jiffies + rt_expires);
2098 } else {
2099 rt6_clean_expires(rt);
2100 }
2101 } else if (valid_lft) {
2102 clock_t expires = 0;
2103 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2104 if (addrconf_finite_timeout(rt_expires)) {
2105 /* not infinity */
2106 flags |= RTF_EXPIRES;
2107 expires = jiffies_to_clock_t(rt_expires);
2108 }
2109 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2110 dev, expires, flags);
2111 }
2112 ip6_rt_put(rt);
2113 }
2114
2115 /* Try to figure out our local address for this prefix */
2116
2117 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2118 struct inet6_ifaddr *ifp;
2119 struct in6_addr addr;
2120 int create = 0, update_lft = 0;
2121 bool tokenized = false;
2122
2123 if (pinfo->prefix_len == 64) {
2124 memcpy(&addr, &pinfo->prefix, 8);
2125
2126 if (!ipv6_addr_any(&in6_dev->token)) {
2127 read_lock_bh(&in6_dev->lock);
2128 memcpy(addr.s6_addr + 8,
2129 in6_dev->token.s6_addr + 8, 8);
2130 read_unlock_bh(&in6_dev->lock);
2131 tokenized = true;
2132 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2133 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2134 in6_dev_put(in6_dev);
2135 return;
2136 }
2137 goto ok;
2138 }
2139 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2140 pinfo->prefix_len);
2141 in6_dev_put(in6_dev);
2142 return;
2143
2144 ok:
2145
2146 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2147
2148 if (ifp == NULL && valid_lft) {
2149 int max_addresses = in6_dev->cnf.max_addresses;
2150 u32 addr_flags = 0;
2151
2152 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2153 if (in6_dev->cnf.optimistic_dad &&
2154 !net->ipv6.devconf_all->forwarding && sllao)
2155 addr_flags = IFA_F_OPTIMISTIC;
2156 #endif
2157
2158 /* Do not allow to create too much of autoconfigured
2159 * addresses; this would be too easy way to crash kernel.
2160 */
2161 if (!max_addresses ||
2162 ipv6_count_addresses(in6_dev) < max_addresses)
2163 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2164 pinfo->prefix_len,
2165 addr_type&IPV6_ADDR_SCOPE_MASK,
2166 addr_flags, valid_lft,
2167 prefered_lft);
2168
2169 if (IS_ERR_OR_NULL(ifp)) {
2170 in6_dev_put(in6_dev);
2171 return;
2172 }
2173
2174 update_lft = 0;
2175 create = 1;
2176 ifp->cstamp = jiffies;
2177 ifp->tokenized = tokenized;
2178 addrconf_dad_start(ifp);
2179 }
2180
2181 if (ifp) {
2182 int flags;
2183 unsigned long now;
2184 struct inet6_ifaddr *ift;
2185 u32 stored_lft;
2186
2187 /* update lifetime (RFC2462 5.5.3 e) */
2188 spin_lock(&ifp->lock);
2189 now = jiffies;
2190 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2191 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2192 else
2193 stored_lft = 0;
2194 if (!update_lft && !create && stored_lft) {
2195 const u32 minimum_lft = min(
2196 stored_lft, (u32)MIN_VALID_LIFETIME);
2197 valid_lft = max(valid_lft, minimum_lft);
2198
2199 /* RFC4862 Section 5.5.3e:
2200 * "Note that the preferred lifetime of the
2201 * corresponding address is always reset to
2202 * the Preferred Lifetime in the received
2203 * Prefix Information option, regardless of
2204 * whether the valid lifetime is also reset or
2205 * ignored."
2206 *
2207 * So we should always update prefered_lft here.
2208 */
2209 update_lft = 1;
2210 }
2211
2212 if (update_lft) {
2213 ifp->valid_lft = valid_lft;
2214 ifp->prefered_lft = prefered_lft;
2215 ifp->tstamp = now;
2216 flags = ifp->flags;
2217 ifp->flags &= ~IFA_F_DEPRECATED;
2218 spin_unlock(&ifp->lock);
2219
2220 if (!(flags&IFA_F_TENTATIVE))
2221 ipv6_ifa_notify(0, ifp);
2222 } else
2223 spin_unlock(&ifp->lock);
2224
2225 read_lock_bh(&in6_dev->lock);
2226 /* update all temporary addresses in the list */
2227 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2228 tmp_list) {
2229 int age, max_valid, max_prefered;
2230
2231 if (ifp != ift->ifpub)
2232 continue;
2233
2234 /*
2235 * RFC 4941 section 3.3:
2236 * If a received option will extend the lifetime
2237 * of a public address, the lifetimes of
2238 * temporary addresses should be extended,
2239 * subject to the overall constraint that no
2240 * temporary addresses should ever remain
2241 * "valid" or "preferred" for a time longer than
2242 * (TEMP_VALID_LIFETIME) or
2243 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2244 * respectively.
2245 */
2246 age = (now - ift->cstamp) / HZ;
2247 max_valid = in6_dev->cnf.temp_valid_lft - age;
2248 if (max_valid < 0)
2249 max_valid = 0;
2250
2251 max_prefered = in6_dev->cnf.temp_prefered_lft -
2252 in6_dev->cnf.max_desync_factor -
2253 age;
2254 if (max_prefered < 0)
2255 max_prefered = 0;
2256
2257 if (valid_lft > max_valid)
2258 valid_lft = max_valid;
2259
2260 if (prefered_lft > max_prefered)
2261 prefered_lft = max_prefered;
2262
2263 spin_lock(&ift->lock);
2264 flags = ift->flags;
2265 ift->valid_lft = valid_lft;
2266 ift->prefered_lft = prefered_lft;
2267 ift->tstamp = now;
2268 if (prefered_lft > 0)
2269 ift->flags &= ~IFA_F_DEPRECATED;
2270
2271 spin_unlock(&ift->lock);
2272 if (!(flags&IFA_F_TENTATIVE))
2273 ipv6_ifa_notify(0, ift);
2274 }
2275
2276 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2277 /*
2278 * When a new public address is created as
2279 * described in [ADDRCONF], also create a new
2280 * temporary address. Also create a temporary
2281 * address if it's enabled but no temporary
2282 * address currently exists.
2283 */
2284 read_unlock_bh(&in6_dev->lock);
2285 ipv6_create_tempaddr(ifp, NULL);
2286 } else {
2287 read_unlock_bh(&in6_dev->lock);
2288 }
2289
2290 in6_ifa_put(ifp);
2291 addrconf_verify(0);
2292 }
2293 }
2294 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2295 in6_dev_put(in6_dev);
2296 }
2297
2298 /*
2299 * Set destination address.
2300 * Special case for SIT interfaces where we create a new "virtual"
2301 * device.
2302 */
2303 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2304 {
2305 struct in6_ifreq ireq;
2306 struct net_device *dev;
2307 int err = -EINVAL;
2308
2309 rtnl_lock();
2310
2311 err = -EFAULT;
2312 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2313 goto err_exit;
2314
2315 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2316
2317 err = -ENODEV;
2318 if (dev == NULL)
2319 goto err_exit;
2320
2321 #if IS_ENABLED(CONFIG_IPV6_SIT)
2322 if (dev->type == ARPHRD_SIT) {
2323 const struct net_device_ops *ops = dev->netdev_ops;
2324 struct ifreq ifr;
2325 struct ip_tunnel_parm p;
2326
2327 err = -EADDRNOTAVAIL;
2328 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2329 goto err_exit;
2330
2331 memset(&p, 0, sizeof(p));
2332 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2333 p.iph.saddr = 0;
2334 p.iph.version = 4;
2335 p.iph.ihl = 5;
2336 p.iph.protocol = IPPROTO_IPV6;
2337 p.iph.ttl = 64;
2338 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2339
2340 if (ops->ndo_do_ioctl) {
2341 mm_segment_t oldfs = get_fs();
2342
2343 set_fs(KERNEL_DS);
2344 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2345 set_fs(oldfs);
2346 } else
2347 err = -EOPNOTSUPP;
2348
2349 if (err == 0) {
2350 err = -ENOBUFS;
2351 dev = __dev_get_by_name(net, p.name);
2352 if (!dev)
2353 goto err_exit;
2354 err = dev_open(dev);
2355 }
2356 }
2357 #endif
2358
2359 err_exit:
2360 rtnl_unlock();
2361 return err;
2362 }
2363
2364 /*
2365 * Manual configuration of address on an interface
2366 */
2367 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2368 const struct in6_addr *peer_pfx,
2369 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2370 __u32 valid_lft)
2371 {
2372 struct inet6_ifaddr *ifp;
2373 struct inet6_dev *idev;
2374 struct net_device *dev;
2375 int scope;
2376 u32 flags;
2377 clock_t expires;
2378 unsigned long timeout;
2379
2380 ASSERT_RTNL();
2381
2382 if (plen > 128)
2383 return -EINVAL;
2384
2385 /* check the lifetime */
2386 if (!valid_lft || prefered_lft > valid_lft)
2387 return -EINVAL;
2388
2389 dev = __dev_get_by_index(net, ifindex);
2390 if (!dev)
2391 return -ENODEV;
2392
2393 idev = addrconf_add_dev(dev);
2394 if (IS_ERR(idev))
2395 return PTR_ERR(idev);
2396
2397 scope = ipv6_addr_scope(pfx);
2398
2399 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2400 if (addrconf_finite_timeout(timeout)) {
2401 expires = jiffies_to_clock_t(timeout * HZ);
2402 valid_lft = timeout;
2403 flags = RTF_EXPIRES;
2404 } else {
2405 expires = 0;
2406 flags = 0;
2407 ifa_flags |= IFA_F_PERMANENT;
2408 }
2409
2410 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2411 if (addrconf_finite_timeout(timeout)) {
2412 if (timeout == 0)
2413 ifa_flags |= IFA_F_DEPRECATED;
2414 prefered_lft = timeout;
2415 }
2416
2417 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2418 valid_lft, prefered_lft);
2419
2420 if (!IS_ERR(ifp)) {
2421 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2422 expires, flags);
2423 /*
2424 * Note that section 3.1 of RFC 4429 indicates
2425 * that the Optimistic flag should not be set for
2426 * manually configured addresses
2427 */
2428 addrconf_dad_start(ifp);
2429 in6_ifa_put(ifp);
2430 addrconf_verify(0);
2431 return 0;
2432 }
2433
2434 return PTR_ERR(ifp);
2435 }
2436
2437 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2438 unsigned int plen)
2439 {
2440 struct inet6_ifaddr *ifp;
2441 struct inet6_dev *idev;
2442 struct net_device *dev;
2443
2444 if (plen > 128)
2445 return -EINVAL;
2446
2447 dev = __dev_get_by_index(net, ifindex);
2448 if (!dev)
2449 return -ENODEV;
2450
2451 if ((idev = __in6_dev_get(dev)) == NULL)
2452 return -ENXIO;
2453
2454 read_lock_bh(&idev->lock);
2455 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2456 if (ifp->prefix_len == plen &&
2457 ipv6_addr_equal(pfx, &ifp->addr)) {
2458 in6_ifa_hold(ifp);
2459 read_unlock_bh(&idev->lock);
2460
2461 ipv6_del_addr(ifp);
2462 return 0;
2463 }
2464 }
2465 read_unlock_bh(&idev->lock);
2466 return -EADDRNOTAVAIL;
2467 }
2468
2469
2470 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2471 {
2472 struct in6_ifreq ireq;
2473 int err;
2474
2475 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2476 return -EPERM;
2477
2478 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2479 return -EFAULT;
2480
2481 rtnl_lock();
2482 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2483 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2484 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2485 rtnl_unlock();
2486 return err;
2487 }
2488
2489 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2490 {
2491 struct in6_ifreq ireq;
2492 int err;
2493
2494 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2495 return -EPERM;
2496
2497 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2498 return -EFAULT;
2499
2500 rtnl_lock();
2501 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2502 ireq.ifr6_prefixlen);
2503 rtnl_unlock();
2504 return err;
2505 }
2506
2507 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2508 int plen, int scope)
2509 {
2510 struct inet6_ifaddr *ifp;
2511
2512 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2513 scope, IFA_F_PERMANENT, 0, 0);
2514 if (!IS_ERR(ifp)) {
2515 spin_lock_bh(&ifp->lock);
2516 ifp->flags &= ~IFA_F_TENTATIVE;
2517 spin_unlock_bh(&ifp->lock);
2518 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2519 in6_ifa_put(ifp);
2520 }
2521 }
2522
2523 #if IS_ENABLED(CONFIG_IPV6_SIT)
2524 static void sit_add_v4_addrs(struct inet6_dev *idev)
2525 {
2526 struct in6_addr addr;
2527 struct net_device *dev;
2528 struct net *net = dev_net(idev->dev);
2529 int scope, plen;
2530 u32 pflags = 0;
2531
2532 ASSERT_RTNL();
2533
2534 memset(&addr, 0, sizeof(struct in6_addr));
2535 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2536
2537 if (idev->dev->flags&IFF_POINTOPOINT) {
2538 addr.s6_addr32[0] = htonl(0xfe800000);
2539 scope = IFA_LINK;
2540 plen = 64;
2541 } else {
2542 scope = IPV6_ADDR_COMPATv4;
2543 plen = 96;
2544 pflags |= RTF_NONEXTHOP;
2545 }
2546
2547 if (addr.s6_addr32[3]) {
2548 add_addr(idev, &addr, plen, scope);
2549 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2550 return;
2551 }
2552
2553 for_each_netdev(net, dev) {
2554 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2555 if (in_dev && (dev->flags & IFF_UP)) {
2556 struct in_ifaddr *ifa;
2557
2558 int flag = scope;
2559
2560 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2561
2562 addr.s6_addr32[3] = ifa->ifa_local;
2563
2564 if (ifa->ifa_scope == RT_SCOPE_LINK)
2565 continue;
2566 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2567 if (idev->dev->flags&IFF_POINTOPOINT)
2568 continue;
2569 flag |= IFA_HOST;
2570 }
2571
2572 add_addr(idev, &addr, plen, flag);
2573 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2574 pflags);
2575 }
2576 }
2577 }
2578 }
2579 #endif
2580
2581 static void init_loopback(struct net_device *dev)
2582 {
2583 struct inet6_dev *idev;
2584 struct net_device *sp_dev;
2585 struct inet6_ifaddr *sp_ifa;
2586 struct rt6_info *sp_rt;
2587
2588 /* ::1 */
2589
2590 ASSERT_RTNL();
2591
2592 if ((idev = ipv6_find_idev(dev)) == NULL) {
2593 pr_debug("%s: add_dev failed\n", __func__);
2594 return;
2595 }
2596
2597 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2598
2599 /* Add routes to other interface's IPv6 addresses */
2600 for_each_netdev(dev_net(dev), sp_dev) {
2601 if (!strcmp(sp_dev->name, dev->name))
2602 continue;
2603
2604 idev = __in6_dev_get(sp_dev);
2605 if (!idev)
2606 continue;
2607
2608 read_lock_bh(&idev->lock);
2609 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2610
2611 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2612 continue;
2613
2614 if (sp_ifa->rt)
2615 continue;
2616
2617 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 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 (dev->type != ARPHRD_6LOWPAN)) {
2664 /* Alas, we support only Ethernet autoconfiguration. */
2665 return;
2666 }
2667
2668 idev = addrconf_add_dev(dev);
2669 if (IS_ERR(idev))
2670 return;
2671
2672 memset(&addr, 0, sizeof(struct in6_addr));
2673 addr.s6_addr32[0] = htonl(0xFE800000);
2674
2675 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2676 addrconf_add_linklocal(idev, &addr);
2677 }
2678
2679 #if IS_ENABLED(CONFIG_IPV6_SIT)
2680 static void addrconf_sit_config(struct net_device *dev)
2681 {
2682 struct inet6_dev *idev;
2683
2684 ASSERT_RTNL();
2685
2686 /*
2687 * Configure the tunnel with one of our IPv4
2688 * addresses... we should configure all of
2689 * our v4 addrs in the tunnel
2690 */
2691
2692 if ((idev = ipv6_find_idev(dev)) == NULL) {
2693 pr_debug("%s: add_dev failed\n", __func__);
2694 return;
2695 }
2696
2697 if (dev->priv_flags & IFF_ISATAP) {
2698 struct in6_addr addr;
2699
2700 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2701 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2702 addrconf_add_linklocal(idev, &addr);
2703 return;
2704 }
2705
2706 sit_add_v4_addrs(idev);
2707
2708 if (dev->flags&IFF_POINTOPOINT)
2709 addrconf_add_mroute(dev);
2710 }
2711 #endif
2712
2713 #if IS_ENABLED(CONFIG_NET_IPGRE)
2714 static void addrconf_gre_config(struct net_device *dev)
2715 {
2716 struct inet6_dev *idev;
2717 struct in6_addr addr;
2718
2719 ASSERT_RTNL();
2720
2721 if ((idev = ipv6_find_idev(dev)) == NULL) {
2722 pr_debug("%s: add_dev failed\n", __func__);
2723 return;
2724 }
2725
2726 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2727 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2728 addrconf_add_linklocal(idev, &addr);
2729 }
2730 #endif
2731
2732 static inline int
2733 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2734 {
2735 struct in6_addr lladdr;
2736
2737 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2738 addrconf_add_linklocal(idev, &lladdr);
2739 return 0;
2740 }
2741 return -1;
2742 }
2743
2744 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2745 void *ptr)
2746 {
2747 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2748 struct inet6_dev *idev = __in6_dev_get(dev);
2749 int run_pending = 0;
2750 int err;
2751
2752 switch (event) {
2753 case NETDEV_REGISTER:
2754 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2755 idev = ipv6_add_dev(dev);
2756 if (!idev)
2757 return notifier_from_errno(-ENOMEM);
2758 }
2759 break;
2760
2761 case NETDEV_UP:
2762 case NETDEV_CHANGE:
2763 if (dev->flags & IFF_SLAVE)
2764 break;
2765
2766 if (event == NETDEV_UP) {
2767 if (!addrconf_qdisc_ok(dev)) {
2768 /* device is not ready yet. */
2769 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2770 dev->name);
2771 break;
2772 }
2773
2774 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2775 idev = ipv6_add_dev(dev);
2776
2777 if (idev) {
2778 idev->if_flags |= IF_READY;
2779 run_pending = 1;
2780 }
2781 } else {
2782 if (!addrconf_qdisc_ok(dev)) {
2783 /* device is still not ready. */
2784 break;
2785 }
2786
2787 if (idev) {
2788 if (idev->if_flags & IF_READY)
2789 /* device is already configured. */
2790 break;
2791 idev->if_flags |= IF_READY;
2792 }
2793
2794 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2795 dev->name);
2796
2797 run_pending = 1;
2798 }
2799
2800 switch (dev->type) {
2801 #if IS_ENABLED(CONFIG_IPV6_SIT)
2802 case ARPHRD_SIT:
2803 addrconf_sit_config(dev);
2804 break;
2805 #endif
2806 #if IS_ENABLED(CONFIG_NET_IPGRE)
2807 case ARPHRD_IPGRE:
2808 addrconf_gre_config(dev);
2809 break;
2810 #endif
2811 case ARPHRD_LOOPBACK:
2812 init_loopback(dev);
2813 break;
2814
2815 default:
2816 addrconf_dev_config(dev);
2817 break;
2818 }
2819
2820 if (idev) {
2821 if (run_pending)
2822 addrconf_dad_run(idev);
2823
2824 /*
2825 * If the MTU changed during the interface down,
2826 * when the interface up, the changed MTU must be
2827 * reflected in the idev as well as routers.
2828 */
2829 if (idev->cnf.mtu6 != dev->mtu &&
2830 dev->mtu >= IPV6_MIN_MTU) {
2831 rt6_mtu_change(dev, dev->mtu);
2832 idev->cnf.mtu6 = dev->mtu;
2833 }
2834 idev->tstamp = jiffies;
2835 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2836
2837 /*
2838 * If the changed mtu during down is lower than
2839 * IPV6_MIN_MTU stop IPv6 on this interface.
2840 */
2841 if (dev->mtu < IPV6_MIN_MTU)
2842 addrconf_ifdown(dev, 1);
2843 }
2844 break;
2845
2846 case NETDEV_CHANGEMTU:
2847 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2848 rt6_mtu_change(dev, dev->mtu);
2849 idev->cnf.mtu6 = dev->mtu;
2850 break;
2851 }
2852
2853 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2854 idev = ipv6_add_dev(dev);
2855 if (idev)
2856 break;
2857 }
2858
2859 /*
2860 * MTU falled under IPV6_MIN_MTU.
2861 * Stop IPv6 on this interface.
2862 */
2863
2864 case NETDEV_DOWN:
2865 case NETDEV_UNREGISTER:
2866 /*
2867 * Remove all addresses from this interface.
2868 */
2869 addrconf_ifdown(dev, event != NETDEV_DOWN);
2870 break;
2871
2872 case NETDEV_CHANGENAME:
2873 if (idev) {
2874 snmp6_unregister_dev(idev);
2875 addrconf_sysctl_unregister(idev);
2876 addrconf_sysctl_register(idev);
2877 err = snmp6_register_dev(idev);
2878 if (err)
2879 return notifier_from_errno(err);
2880 }
2881 break;
2882
2883 case NETDEV_PRE_TYPE_CHANGE:
2884 case NETDEV_POST_TYPE_CHANGE:
2885 addrconf_type_change(dev, event);
2886 break;
2887 }
2888
2889 return NOTIFY_OK;
2890 }
2891
2892 /*
2893 * addrconf module should be notified of a device going up
2894 */
2895 static struct notifier_block ipv6_dev_notf = {
2896 .notifier_call = addrconf_notify,
2897 };
2898
2899 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2900 {
2901 struct inet6_dev *idev;
2902 ASSERT_RTNL();
2903
2904 idev = __in6_dev_get(dev);
2905
2906 if (event == NETDEV_POST_TYPE_CHANGE)
2907 ipv6_mc_remap(idev);
2908 else if (event == NETDEV_PRE_TYPE_CHANGE)
2909 ipv6_mc_unmap(idev);
2910 }
2911
2912 static int addrconf_ifdown(struct net_device *dev, int how)
2913 {
2914 struct net *net = dev_net(dev);
2915 struct inet6_dev *idev;
2916 struct inet6_ifaddr *ifa;
2917 int state, i;
2918
2919 ASSERT_RTNL();
2920
2921 rt6_ifdown(net, dev);
2922 neigh_ifdown(&nd_tbl, dev);
2923
2924 idev = __in6_dev_get(dev);
2925 if (idev == NULL)
2926 return -ENODEV;
2927
2928 /*
2929 * Step 1: remove reference to ipv6 device from parent device.
2930 * Do not dev_put!
2931 */
2932 if (how) {
2933 idev->dead = 1;
2934
2935 /* protected by rtnl_lock */
2936 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2937
2938 /* Step 1.5: remove snmp6 entry */
2939 snmp6_unregister_dev(idev);
2940
2941 }
2942
2943 /* Step 2: clear hash table */
2944 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2945 struct hlist_head *h = &inet6_addr_lst[i];
2946
2947 spin_lock_bh(&addrconf_hash_lock);
2948 restart:
2949 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
2950 if (ifa->idev == idev) {
2951 hlist_del_init_rcu(&ifa->addr_lst);
2952 addrconf_del_dad_timer(ifa);
2953 goto restart;
2954 }
2955 }
2956 spin_unlock_bh(&addrconf_hash_lock);
2957 }
2958
2959 write_lock_bh(&idev->lock);
2960
2961 addrconf_del_rs_timer(idev);
2962
2963 /* Step 2: clear flags for stateless addrconf */
2964 if (!how)
2965 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2966
2967 if (how && del_timer(&idev->regen_timer))
2968 in6_dev_put(idev);
2969
2970 /* Step 3: clear tempaddr list */
2971 while (!list_empty(&idev->tempaddr_list)) {
2972 ifa = list_first_entry(&idev->tempaddr_list,
2973 struct inet6_ifaddr, tmp_list);
2974 list_del(&ifa->tmp_list);
2975 write_unlock_bh(&idev->lock);
2976 spin_lock_bh(&ifa->lock);
2977
2978 if (ifa->ifpub) {
2979 in6_ifa_put(ifa->ifpub);
2980 ifa->ifpub = NULL;
2981 }
2982 spin_unlock_bh(&ifa->lock);
2983 in6_ifa_put(ifa);
2984 write_lock_bh(&idev->lock);
2985 }
2986
2987 while (!list_empty(&idev->addr_list)) {
2988 ifa = list_first_entry(&idev->addr_list,
2989 struct inet6_ifaddr, if_list);
2990 addrconf_del_dad_timer(ifa);
2991
2992 list_del(&ifa->if_list);
2993
2994 write_unlock_bh(&idev->lock);
2995
2996 spin_lock_bh(&ifa->state_lock);
2997 state = ifa->state;
2998 ifa->state = INET6_IFADDR_STATE_DEAD;
2999 spin_unlock_bh(&ifa->state_lock);
3000
3001 if (state != INET6_IFADDR_STATE_DEAD) {
3002 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3003 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3004 }
3005 in6_ifa_put(ifa);
3006
3007 write_lock_bh(&idev->lock);
3008 }
3009
3010 write_unlock_bh(&idev->lock);
3011
3012 /* Step 5: Discard multicast list */
3013 if (how)
3014 ipv6_mc_destroy_dev(idev);
3015 else
3016 ipv6_mc_down(idev);
3017
3018 idev->tstamp = jiffies;
3019
3020 /* Last: Shot the device (if unregistered) */
3021 if (how) {
3022 addrconf_sysctl_unregister(idev);
3023 neigh_parms_release(&nd_tbl, idev->nd_parms);
3024 neigh_ifdown(&nd_tbl, dev);
3025 in6_dev_put(idev);
3026 }
3027 return 0;
3028 }
3029
3030 static void addrconf_rs_timer(unsigned long data)
3031 {
3032 struct inet6_dev *idev = (struct inet6_dev *)data;
3033 struct net_device *dev = idev->dev;
3034 struct in6_addr lladdr;
3035
3036 write_lock(&idev->lock);
3037 if (idev->dead || !(idev->if_flags & IF_READY))
3038 goto out;
3039
3040 if (!ipv6_accept_ra(idev))
3041 goto out;
3042
3043 /* Announcement received after solicitation was sent */
3044 if (idev->if_flags & IF_RA_RCVD)
3045 goto out;
3046
3047 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3048 write_unlock(&idev->lock);
3049 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3050 ndisc_send_rs(dev, &lladdr,
3051 &in6addr_linklocal_allrouters);
3052 else
3053 goto put;
3054
3055 write_lock(&idev->lock);
3056 /* The wait after the last probe can be shorter */
3057 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3058 idev->cnf.rtr_solicits) ?
3059 idev->cnf.rtr_solicit_delay :
3060 idev->cnf.rtr_solicit_interval);
3061 } else {
3062 /*
3063 * Note: we do not support deprecated "all on-link"
3064 * assumption any longer.
3065 */
3066 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3067 }
3068
3069 out:
3070 write_unlock(&idev->lock);
3071 put:
3072 in6_dev_put(idev);
3073 }
3074
3075 /*
3076 * Duplicate Address Detection
3077 */
3078 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3079 {
3080 unsigned long rand_num;
3081 struct inet6_dev *idev = ifp->idev;
3082
3083 if (ifp->flags & IFA_F_OPTIMISTIC)
3084 rand_num = 0;
3085 else
3086 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3087
3088 ifp->dad_probes = idev->cnf.dad_transmits;
3089 addrconf_mod_dad_timer(ifp, rand_num);
3090 }
3091
3092 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3093 {
3094 struct inet6_dev *idev = ifp->idev;
3095 struct net_device *dev = idev->dev;
3096
3097 addrconf_join_solict(dev, &ifp->addr);
3098
3099 net_srandom(ifp->addr.s6_addr32[3]);
3100
3101 read_lock_bh(&idev->lock);
3102 spin_lock(&ifp->lock);
3103 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3104 goto out;
3105
3106 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3107 idev->cnf.accept_dad < 1 ||
3108 !(ifp->flags&IFA_F_TENTATIVE) ||
3109 ifp->flags & IFA_F_NODAD) {
3110 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3111 spin_unlock(&ifp->lock);
3112 read_unlock_bh(&idev->lock);
3113
3114 addrconf_dad_completed(ifp);
3115 return;
3116 }
3117
3118 if (!(idev->if_flags & IF_READY)) {
3119 spin_unlock(&ifp->lock);
3120 read_unlock_bh(&idev->lock);
3121 /*
3122 * If the device is not ready:
3123 * - keep it tentative if it is a permanent address.
3124 * - otherwise, kill it.
3125 */
3126 in6_ifa_hold(ifp);
3127 addrconf_dad_stop(ifp, 0);
3128 return;
3129 }
3130
3131 /*
3132 * Optimistic nodes can start receiving
3133 * Frames right away
3134 */
3135 if (ifp->flags & IFA_F_OPTIMISTIC)
3136 ip6_ins_rt(ifp->rt);
3137
3138 addrconf_dad_kick(ifp);
3139 out:
3140 spin_unlock(&ifp->lock);
3141 read_unlock_bh(&idev->lock);
3142 }
3143
3144 static void addrconf_dad_timer(unsigned long data)
3145 {
3146 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3147 struct inet6_dev *idev = ifp->idev;
3148 struct in6_addr mcaddr;
3149
3150 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3151 goto out;
3152
3153 write_lock(&idev->lock);
3154 if (idev->dead || !(idev->if_flags & IF_READY)) {
3155 write_unlock(&idev->lock);
3156 goto out;
3157 }
3158
3159 spin_lock(&ifp->lock);
3160 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3161 spin_unlock(&ifp->lock);
3162 write_unlock(&idev->lock);
3163 goto out;
3164 }
3165
3166 if (ifp->dad_probes == 0) {
3167 /*
3168 * DAD was successful
3169 */
3170
3171 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3172 spin_unlock(&ifp->lock);
3173 write_unlock(&idev->lock);
3174
3175 addrconf_dad_completed(ifp);
3176
3177 goto out;
3178 }
3179
3180 ifp->dad_probes--;
3181 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
3182 spin_unlock(&ifp->lock);
3183 write_unlock(&idev->lock);
3184
3185 /* send a neighbour solicitation for our addr */
3186 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3187 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3188 out:
3189 in6_ifa_put(ifp);
3190 }
3191
3192 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3193 {
3194 struct net_device *dev = ifp->idev->dev;
3195 struct in6_addr lladdr;
3196 bool send_rs, send_mld;
3197
3198 addrconf_del_dad_timer(ifp);
3199
3200 /*
3201 * Configure the address for reception. Now it is valid.
3202 */
3203
3204 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3205
3206 /* If added prefix is link local and we are prepared to process
3207 router advertisements, start sending router solicitations.
3208 */
3209
3210 read_lock_bh(&ifp->idev->lock);
3211 spin_lock(&ifp->lock);
3212 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3213 ifp->idev->valid_ll_addr_cnt == 1;
3214 send_rs = send_mld &&
3215 ipv6_accept_ra(ifp->idev) &&
3216 ifp->idev->cnf.rtr_solicits > 0 &&
3217 (dev->flags&IFF_LOOPBACK) == 0;
3218 spin_unlock(&ifp->lock);
3219 read_unlock_bh(&ifp->idev->lock);
3220
3221 /* While dad is in progress mld report's source address is in6_addrany.
3222 * Resend with proper ll now.
3223 */
3224 if (send_mld)
3225 ipv6_mc_dad_complete(ifp->idev);
3226
3227 if (send_rs) {
3228 /*
3229 * If a host as already performed a random delay
3230 * [...] as part of DAD [...] there is no need
3231 * to delay again before sending the first RS
3232 */
3233 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3234 return;
3235 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3236
3237 write_lock_bh(&ifp->idev->lock);
3238 spin_lock(&ifp->lock);
3239 ifp->idev->rs_probes = 1;
3240 ifp->idev->if_flags |= IF_RS_SENT;
3241 addrconf_mod_rs_timer(ifp->idev,
3242 ifp->idev->cnf.rtr_solicit_interval);
3243 spin_unlock(&ifp->lock);
3244 write_unlock_bh(&ifp->idev->lock);
3245 }
3246 }
3247
3248 static void addrconf_dad_run(struct inet6_dev *idev)
3249 {
3250 struct inet6_ifaddr *ifp;
3251
3252 read_lock_bh(&idev->lock);
3253 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3254 spin_lock(&ifp->lock);
3255 if (ifp->flags & IFA_F_TENTATIVE &&
3256 ifp->state == INET6_IFADDR_STATE_DAD)
3257 addrconf_dad_kick(ifp);
3258 spin_unlock(&ifp->lock);
3259 }
3260 read_unlock_bh(&idev->lock);
3261 }
3262
3263 #ifdef CONFIG_PROC_FS
3264 struct if6_iter_state {
3265 struct seq_net_private p;
3266 int bucket;
3267 int offset;
3268 };
3269
3270 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3271 {
3272 struct inet6_ifaddr *ifa = NULL;
3273 struct if6_iter_state *state = seq->private;
3274 struct net *net = seq_file_net(seq);
3275 int p = 0;
3276
3277 /* initial bucket if pos is 0 */
3278 if (pos == 0) {
3279 state->bucket = 0;
3280 state->offset = 0;
3281 }
3282
3283 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3284 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3285 addr_lst) {
3286 if (!net_eq(dev_net(ifa->idev->dev), net))
3287 continue;
3288 /* sync with offset */
3289 if (p < state->offset) {
3290 p++;
3291 continue;
3292 }
3293 state->offset++;
3294 return ifa;
3295 }
3296
3297 /* prepare for next bucket */
3298 state->offset = 0;
3299 p = 0;
3300 }
3301 return NULL;
3302 }
3303
3304 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3305 struct inet6_ifaddr *ifa)
3306 {
3307 struct if6_iter_state *state = seq->private;
3308 struct net *net = seq_file_net(seq);
3309
3310 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3311 if (!net_eq(dev_net(ifa->idev->dev), net))
3312 continue;
3313 state->offset++;
3314 return ifa;
3315 }
3316
3317 while (++state->bucket < IN6_ADDR_HSIZE) {
3318 state->offset = 0;
3319 hlist_for_each_entry_rcu_bh(ifa,
3320 &inet6_addr_lst[state->bucket], addr_lst) {
3321 if (!net_eq(dev_net(ifa->idev->dev), net))
3322 continue;
3323 state->offset++;
3324 return ifa;
3325 }
3326 }
3327
3328 return NULL;
3329 }
3330
3331 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3332 __acquires(rcu_bh)
3333 {
3334 rcu_read_lock_bh();
3335 return if6_get_first(seq, *pos);
3336 }
3337
3338 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3339 {
3340 struct inet6_ifaddr *ifa;
3341
3342 ifa = if6_get_next(seq, v);
3343 ++*pos;
3344 return ifa;
3345 }
3346
3347 static void if6_seq_stop(struct seq_file *seq, void *v)
3348 __releases(rcu_bh)
3349 {
3350 rcu_read_unlock_bh();
3351 }
3352
3353 static int if6_seq_show(struct seq_file *seq, void *v)
3354 {
3355 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3356 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3357 &ifp->addr,
3358 ifp->idev->dev->ifindex,
3359 ifp->prefix_len,
3360 ifp->scope,
3361 ifp->flags,
3362 ifp->idev->dev->name);
3363 return 0;
3364 }
3365
3366 static const struct seq_operations if6_seq_ops = {
3367 .start = if6_seq_start,
3368 .next = if6_seq_next,
3369 .show = if6_seq_show,
3370 .stop = if6_seq_stop,
3371 };
3372
3373 static int if6_seq_open(struct inode *inode, struct file *file)
3374 {
3375 return seq_open_net(inode, file, &if6_seq_ops,
3376 sizeof(struct if6_iter_state));
3377 }
3378
3379 static const struct file_operations if6_fops = {
3380 .owner = THIS_MODULE,
3381 .open = if6_seq_open,
3382 .read = seq_read,
3383 .llseek = seq_lseek,
3384 .release = seq_release_net,
3385 };
3386
3387 static int __net_init if6_proc_net_init(struct net *net)
3388 {
3389 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3390 return -ENOMEM;
3391 return 0;
3392 }
3393
3394 static void __net_exit if6_proc_net_exit(struct net *net)
3395 {
3396 remove_proc_entry("if_inet6", net->proc_net);
3397 }
3398
3399 static struct pernet_operations if6_proc_net_ops = {
3400 .init = if6_proc_net_init,
3401 .exit = if6_proc_net_exit,
3402 };
3403
3404 int __init if6_proc_init(void)
3405 {
3406 return register_pernet_subsys(&if6_proc_net_ops);
3407 }
3408
3409 void if6_proc_exit(void)
3410 {
3411 unregister_pernet_subsys(&if6_proc_net_ops);
3412 }
3413 #endif /* CONFIG_PROC_FS */
3414
3415 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3416 /* Check if address is a home address configured on any interface. */
3417 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3418 {
3419 int ret = 0;
3420 struct inet6_ifaddr *ifp = NULL;
3421 unsigned int hash = inet6_addr_hash(addr);
3422
3423 rcu_read_lock_bh();
3424 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3425 if (!net_eq(dev_net(ifp->idev->dev), net))
3426 continue;
3427 if (ipv6_addr_equal(&ifp->addr, addr) &&
3428 (ifp->flags & IFA_F_HOMEADDRESS)) {
3429 ret = 1;
3430 break;
3431 }
3432 }
3433 rcu_read_unlock_bh();
3434 return ret;
3435 }
3436 #endif
3437
3438 /*
3439 * Periodic address status verification
3440 */
3441
3442 static void addrconf_verify(unsigned long foo)
3443 {
3444 unsigned long now, next, next_sec, next_sched;
3445 struct inet6_ifaddr *ifp;
3446 int i;
3447
3448 rcu_read_lock_bh();
3449 spin_lock(&addrconf_verify_lock);
3450 now = jiffies;
3451 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3452
3453 del_timer(&addr_chk_timer);
3454
3455 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3456 restart:
3457 hlist_for_each_entry_rcu_bh(ifp,
3458 &inet6_addr_lst[i], addr_lst) {
3459 unsigned long age;
3460
3461 if (ifp->flags & IFA_F_PERMANENT)
3462 continue;
3463
3464 spin_lock(&ifp->lock);
3465 /* We try to batch several events at once. */
3466 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3467
3468 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3469 age >= ifp->valid_lft) {
3470 spin_unlock(&ifp->lock);
3471 in6_ifa_hold(ifp);
3472 ipv6_del_addr(ifp);
3473 goto restart;
3474 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3475 spin_unlock(&ifp->lock);
3476 continue;
3477 } else if (age >= ifp->prefered_lft) {
3478 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3479 int deprecate = 0;
3480
3481 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3482 deprecate = 1;
3483 ifp->flags |= IFA_F_DEPRECATED;
3484 }
3485
3486 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3487 next = ifp->tstamp + ifp->valid_lft * HZ;
3488
3489 spin_unlock(&ifp->lock);
3490
3491 if (deprecate) {
3492 in6_ifa_hold(ifp);
3493
3494 ipv6_ifa_notify(0, ifp);
3495 in6_ifa_put(ifp);
3496 goto restart;
3497 }
3498 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3499 !(ifp->flags&IFA_F_TENTATIVE)) {
3500 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3501 ifp->idev->cnf.dad_transmits *
3502 ifp->idev->nd_parms->retrans_time / HZ;
3503
3504 if (age >= ifp->prefered_lft - regen_advance) {
3505 struct inet6_ifaddr *ifpub = ifp->ifpub;
3506 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3507 next = ifp->tstamp + ifp->prefered_lft * HZ;
3508 if (!ifp->regen_count && ifpub) {
3509 ifp->regen_count++;
3510 in6_ifa_hold(ifp);
3511 in6_ifa_hold(ifpub);
3512 spin_unlock(&ifp->lock);
3513
3514 spin_lock(&ifpub->lock);
3515 ifpub->regen_count = 0;
3516 spin_unlock(&ifpub->lock);
3517 ipv6_create_tempaddr(ifpub, ifp);
3518 in6_ifa_put(ifpub);
3519 in6_ifa_put(ifp);
3520 goto restart;
3521 }
3522 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3523 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3524 spin_unlock(&ifp->lock);
3525 } else {
3526 /* ifp->prefered_lft <= ifp->valid_lft */
3527 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3528 next = ifp->tstamp + ifp->prefered_lft * HZ;
3529 spin_unlock(&ifp->lock);
3530 }
3531 }
3532 }
3533
3534 next_sec = round_jiffies_up(next);
3535 next_sched = next;
3536
3537 /* If rounded timeout is accurate enough, accept it. */
3538 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3539 next_sched = next_sec;
3540
3541 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3542 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3543 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3544
3545 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3546 now, next, next_sec, next_sched);
3547
3548 addr_chk_timer.expires = next_sched;
3549 add_timer(&addr_chk_timer);
3550 spin_unlock(&addrconf_verify_lock);
3551 rcu_read_unlock_bh();
3552 }
3553
3554 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3555 struct in6_addr **peer_pfx)
3556 {
3557 struct in6_addr *pfx = NULL;
3558
3559 *peer_pfx = NULL;
3560
3561 if (addr)
3562 pfx = nla_data(addr);
3563
3564 if (local) {
3565 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3566 *peer_pfx = pfx;
3567 pfx = nla_data(local);
3568 }
3569
3570 return pfx;
3571 }
3572
3573 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3574 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3575 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3576 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3577 };
3578
3579 static int
3580 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3581 {
3582 struct net *net = sock_net(skb->sk);
3583 struct ifaddrmsg *ifm;
3584 struct nlattr *tb[IFA_MAX+1];
3585 struct in6_addr *pfx, *peer_pfx;
3586 int err;
3587
3588 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3589 if (err < 0)
3590 return err;
3591
3592 ifm = nlmsg_data(nlh);
3593 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3594 if (pfx == NULL)
3595 return -EINVAL;
3596
3597 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3598 }
3599
3600 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3601 u32 prefered_lft, u32 valid_lft)
3602 {
3603 u32 flags;
3604 clock_t expires;
3605 unsigned long timeout;
3606
3607 if (!valid_lft || (prefered_lft > valid_lft))
3608 return -EINVAL;
3609
3610 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3611 if (addrconf_finite_timeout(timeout)) {
3612 expires = jiffies_to_clock_t(timeout * HZ);
3613 valid_lft = timeout;
3614 flags = RTF_EXPIRES;
3615 } else {
3616 expires = 0;
3617 flags = 0;
3618 ifa_flags |= IFA_F_PERMANENT;
3619 }
3620
3621 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3622 if (addrconf_finite_timeout(timeout)) {
3623 if (timeout == 0)
3624 ifa_flags |= IFA_F_DEPRECATED;
3625 prefered_lft = timeout;
3626 }
3627
3628 spin_lock_bh(&ifp->lock);
3629 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3630 ifp->tstamp = jiffies;
3631 ifp->valid_lft = valid_lft;
3632 ifp->prefered_lft = prefered_lft;
3633
3634 spin_unlock_bh(&ifp->lock);
3635 if (!(ifp->flags&IFA_F_TENTATIVE))
3636 ipv6_ifa_notify(0, ifp);
3637
3638 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3639 expires, flags);
3640 addrconf_verify(0);
3641
3642 return 0;
3643 }
3644
3645 static int
3646 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3647 {
3648 struct net *net = sock_net(skb->sk);
3649 struct ifaddrmsg *ifm;
3650 struct nlattr *tb[IFA_MAX+1];
3651 struct in6_addr *pfx, *peer_pfx;
3652 struct inet6_ifaddr *ifa;
3653 struct net_device *dev;
3654 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3655 u8 ifa_flags;
3656 int err;
3657
3658 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3659 if (err < 0)
3660 return err;
3661
3662 ifm = nlmsg_data(nlh);
3663 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3664 if (pfx == NULL)
3665 return -EINVAL;
3666
3667 if (tb[IFA_CACHEINFO]) {
3668 struct ifa_cacheinfo *ci;
3669
3670 ci = nla_data(tb[IFA_CACHEINFO]);
3671 valid_lft = ci->ifa_valid;
3672 preferred_lft = ci->ifa_prefered;
3673 } else {
3674 preferred_lft = INFINITY_LIFE_TIME;
3675 valid_lft = INFINITY_LIFE_TIME;
3676 }
3677
3678 dev = __dev_get_by_index(net, ifm->ifa_index);
3679 if (dev == NULL)
3680 return -ENODEV;
3681
3682 /* We ignore other flags so far. */
3683 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3684
3685 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3686 if (ifa == NULL) {
3687 /*
3688 * It would be best to check for !NLM_F_CREATE here but
3689 * userspace alreay relies on not having to provide this.
3690 */
3691 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3692 ifm->ifa_prefixlen, ifa_flags,
3693 preferred_lft, valid_lft);
3694 }
3695
3696 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3697 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3698 err = -EEXIST;
3699 else
3700 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3701
3702 in6_ifa_put(ifa);
3703
3704 return err;
3705 }
3706
3707 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3708 u8 scope, int ifindex)
3709 {
3710 struct ifaddrmsg *ifm;
3711
3712 ifm = nlmsg_data(nlh);
3713 ifm->ifa_family = AF_INET6;
3714 ifm->ifa_prefixlen = prefixlen;
3715 ifm->ifa_flags = flags;
3716 ifm->ifa_scope = scope;
3717 ifm->ifa_index = ifindex;
3718 }
3719
3720 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3721 unsigned long tstamp, u32 preferred, u32 valid)
3722 {
3723 struct ifa_cacheinfo ci;
3724
3725 ci.cstamp = cstamp_delta(cstamp);
3726 ci.tstamp = cstamp_delta(tstamp);
3727 ci.ifa_prefered = preferred;
3728 ci.ifa_valid = valid;
3729
3730 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3731 }
3732
3733 static inline int rt_scope(int ifa_scope)
3734 {
3735 if (ifa_scope & IFA_HOST)
3736 return RT_SCOPE_HOST;
3737 else if (ifa_scope & IFA_LINK)
3738 return RT_SCOPE_LINK;
3739 else if (ifa_scope & IFA_SITE)
3740 return RT_SCOPE_SITE;
3741 else
3742 return RT_SCOPE_UNIVERSE;
3743 }
3744
3745 static inline int inet6_ifaddr_msgsize(void)
3746 {
3747 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3748 + nla_total_size(16) /* IFA_LOCAL */
3749 + nla_total_size(16) /* IFA_ADDRESS */
3750 + nla_total_size(sizeof(struct ifa_cacheinfo));
3751 }
3752
3753 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3754 u32 portid, u32 seq, int event, unsigned int flags)
3755 {
3756 struct nlmsghdr *nlh;
3757 u32 preferred, valid;
3758
3759 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3760 if (nlh == NULL)
3761 return -EMSGSIZE;
3762
3763 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3764 ifa->idev->dev->ifindex);
3765
3766 if (!(ifa->flags&IFA_F_PERMANENT)) {
3767 preferred = ifa->prefered_lft;
3768 valid = ifa->valid_lft;
3769 if (preferred != INFINITY_LIFE_TIME) {
3770 long tval = (jiffies - ifa->tstamp)/HZ;
3771 if (preferred > tval)
3772 preferred -= tval;
3773 else
3774 preferred = 0;
3775 if (valid != INFINITY_LIFE_TIME) {
3776 if (valid > tval)
3777 valid -= tval;
3778 else
3779 valid = 0;
3780 }
3781 }
3782 } else {
3783 preferred = INFINITY_LIFE_TIME;
3784 valid = INFINITY_LIFE_TIME;
3785 }
3786
3787 if (!ipv6_addr_any(&ifa->peer_addr)) {
3788 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3789 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3790 goto error;
3791 } else
3792 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3793 goto error;
3794
3795 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3796 goto error;
3797
3798 return nlmsg_end(skb, nlh);
3799
3800 error:
3801 nlmsg_cancel(skb, nlh);
3802 return -EMSGSIZE;
3803 }
3804
3805 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3806 u32 portid, u32 seq, int event, u16 flags)
3807 {
3808 struct nlmsghdr *nlh;
3809 u8 scope = RT_SCOPE_UNIVERSE;
3810 int ifindex = ifmca->idev->dev->ifindex;
3811
3812 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3813 scope = RT_SCOPE_SITE;
3814
3815 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3816 if (nlh == NULL)
3817 return -EMSGSIZE;
3818
3819 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3820 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3821 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3822 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3823 nlmsg_cancel(skb, nlh);
3824 return -EMSGSIZE;
3825 }
3826
3827 return nlmsg_end(skb, nlh);
3828 }
3829
3830 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3831 u32 portid, u32 seq, int event, unsigned int flags)
3832 {
3833 struct nlmsghdr *nlh;
3834 u8 scope = RT_SCOPE_UNIVERSE;
3835 int ifindex = ifaca->aca_idev->dev->ifindex;
3836
3837 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3838 scope = RT_SCOPE_SITE;
3839
3840 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3841 if (nlh == NULL)
3842 return -EMSGSIZE;
3843
3844 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3845 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3846 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3847 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3848 nlmsg_cancel(skb, nlh);
3849 return -EMSGSIZE;
3850 }
3851
3852 return nlmsg_end(skb, nlh);
3853 }
3854
3855 enum addr_type_t {
3856 UNICAST_ADDR,
3857 MULTICAST_ADDR,
3858 ANYCAST_ADDR,
3859 };
3860
3861 /* called with rcu_read_lock() */
3862 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3863 struct netlink_callback *cb, enum addr_type_t type,
3864 int s_ip_idx, int *p_ip_idx)
3865 {
3866 struct ifmcaddr6 *ifmca;
3867 struct ifacaddr6 *ifaca;
3868 int err = 1;
3869 int ip_idx = *p_ip_idx;
3870
3871 read_lock_bh(&idev->lock);
3872 switch (type) {
3873 case UNICAST_ADDR: {
3874 struct inet6_ifaddr *ifa;
3875
3876 /* unicast address incl. temp addr */
3877 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3878 if (++ip_idx < s_ip_idx)
3879 continue;
3880 err = inet6_fill_ifaddr(skb, ifa,
3881 NETLINK_CB(cb->skb).portid,
3882 cb->nlh->nlmsg_seq,
3883 RTM_NEWADDR,
3884 NLM_F_MULTI);
3885 if (err <= 0)
3886 break;
3887 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3888 }
3889 break;
3890 }
3891 case MULTICAST_ADDR:
3892 /* multicast address */
3893 for (ifmca = idev->mc_list; ifmca;
3894 ifmca = ifmca->next, ip_idx++) {
3895 if (ip_idx < s_ip_idx)
3896 continue;
3897 err = inet6_fill_ifmcaddr(skb, ifmca,
3898 NETLINK_CB(cb->skb).portid,
3899 cb->nlh->nlmsg_seq,
3900 RTM_GETMULTICAST,
3901 NLM_F_MULTI);
3902 if (err <= 0)
3903 break;
3904 }
3905 break;
3906 case ANYCAST_ADDR:
3907 /* anycast address */
3908 for (ifaca = idev->ac_list; ifaca;
3909 ifaca = ifaca->aca_next, ip_idx++) {
3910 if (ip_idx < s_ip_idx)
3911 continue;
3912 err = inet6_fill_ifacaddr(skb, ifaca,
3913 NETLINK_CB(cb->skb).portid,
3914 cb->nlh->nlmsg_seq,
3915 RTM_GETANYCAST,
3916 NLM_F_MULTI);
3917 if (err <= 0)
3918 break;
3919 }
3920 break;
3921 default:
3922 break;
3923 }
3924 read_unlock_bh(&idev->lock);
3925 *p_ip_idx = ip_idx;
3926 return err;
3927 }
3928
3929 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3930 enum addr_type_t type)
3931 {
3932 struct net *net = sock_net(skb->sk);
3933 int h, s_h;
3934 int idx, ip_idx;
3935 int s_idx, s_ip_idx;
3936 struct net_device *dev;
3937 struct inet6_dev *idev;
3938 struct hlist_head *head;
3939
3940 s_h = cb->args[0];
3941 s_idx = idx = cb->args[1];
3942 s_ip_idx = ip_idx = cb->args[2];
3943
3944 rcu_read_lock();
3945 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
3946 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3947 idx = 0;
3948 head = &net->dev_index_head[h];
3949 hlist_for_each_entry_rcu(dev, head, index_hlist) {
3950 if (idx < s_idx)
3951 goto cont;
3952 if (h > s_h || idx > s_idx)
3953 s_ip_idx = 0;
3954 ip_idx = 0;
3955 idev = __in6_dev_get(dev);
3956 if (!idev)
3957 goto cont;
3958
3959 if (in6_dump_addrs(idev, skb, cb, type,
3960 s_ip_idx, &ip_idx) <= 0)
3961 goto done;
3962 cont:
3963 idx++;
3964 }
3965 }
3966 done:
3967 rcu_read_unlock();
3968 cb->args[0] = h;
3969 cb->args[1] = idx;
3970 cb->args[2] = ip_idx;
3971
3972 return skb->len;
3973 }
3974
3975 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3976 {
3977 enum addr_type_t type = UNICAST_ADDR;
3978
3979 return inet6_dump_addr(skb, cb, type);
3980 }
3981
3982 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3983 {
3984 enum addr_type_t type = MULTICAST_ADDR;
3985
3986 return inet6_dump_addr(skb, cb, type);
3987 }
3988
3989
3990 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3991 {
3992 enum addr_type_t type = ANYCAST_ADDR;
3993
3994 return inet6_dump_addr(skb, cb, type);
3995 }
3996
3997 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
3998 {
3999 struct net *net = sock_net(in_skb->sk);
4000 struct ifaddrmsg *ifm;
4001 struct nlattr *tb[IFA_MAX+1];
4002 struct in6_addr *addr = NULL, *peer;
4003 struct net_device *dev = NULL;
4004 struct inet6_ifaddr *ifa;
4005 struct sk_buff *skb;
4006 int err;
4007
4008 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4009 if (err < 0)
4010 goto errout;
4011
4012 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4013 if (addr == NULL) {
4014 err = -EINVAL;
4015 goto errout;
4016 }
4017
4018 ifm = nlmsg_data(nlh);
4019 if (ifm->ifa_index)
4020 dev = __dev_get_by_index(net, ifm->ifa_index);
4021
4022 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4023 if (!ifa) {
4024 err = -EADDRNOTAVAIL;
4025 goto errout;
4026 }
4027
4028 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4029 if (!skb) {
4030 err = -ENOBUFS;
4031 goto errout_ifa;
4032 }
4033
4034 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4035 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4036 if (err < 0) {
4037 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4038 WARN_ON(err == -EMSGSIZE);
4039 kfree_skb(skb);
4040 goto errout_ifa;
4041 }
4042 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4043 errout_ifa:
4044 in6_ifa_put(ifa);
4045 errout:
4046 return err;
4047 }
4048
4049 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4050 {
4051 struct sk_buff *skb;
4052 struct net *net = dev_net(ifa->idev->dev);
4053 int err = -ENOBUFS;
4054
4055 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4056 if (skb == NULL)
4057 goto errout;
4058
4059 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4060 if (err < 0) {
4061 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4062 WARN_ON(err == -EMSGSIZE);
4063 kfree_skb(skb);
4064 goto errout;
4065 }
4066 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4067 return;
4068 errout:
4069 if (err < 0)
4070 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4071 }
4072
4073 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4074 __s32 *array, int bytes)
4075 {
4076 BUG_ON(bytes < (DEVCONF_MAX * 4));
4077
4078 memset(array, 0, bytes);
4079 array[DEVCONF_FORWARDING] = cnf->forwarding;
4080 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4081 array[DEVCONF_MTU6] = cnf->mtu6;
4082 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4083 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4084 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4085 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4086 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4087 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4088 jiffies_to_msecs(cnf->rtr_solicit_interval);
4089 array[DEVCONF_RTR_SOLICIT_DELAY] =
4090 jiffies_to_msecs(cnf->rtr_solicit_delay);
4091 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4092 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4093 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4094 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4095 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4096 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4097 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4098 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4099 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4100 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4101 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4102 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4103 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4104 #ifdef CONFIG_IPV6_ROUTER_PREF
4105 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4106 array[DEVCONF_RTR_PROBE_INTERVAL] =
4107 jiffies_to_msecs(cnf->rtr_probe_interval);
4108 #ifdef CONFIG_IPV6_ROUTE_INFO
4109 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4110 #endif
4111 #endif
4112 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4113 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4114 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4115 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4116 #endif
4117 #ifdef CONFIG_IPV6_MROUTE
4118 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4119 #endif
4120 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4121 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4122 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4123 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4124 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4125 }
4126
4127 static inline size_t inet6_ifla6_size(void)
4128 {
4129 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4130 + nla_total_size(sizeof(struct ifla_cacheinfo))
4131 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4132 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4133 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4134 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4135 }
4136
4137 static inline size_t inet6_if_nlmsg_size(void)
4138 {
4139 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4140 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4141 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4142 + nla_total_size(4) /* IFLA_MTU */
4143 + nla_total_size(4) /* IFLA_LINK */
4144 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4145 }
4146
4147 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4148 int items, int bytes)
4149 {
4150 int i;
4151 int pad = bytes - sizeof(u64) * items;
4152 BUG_ON(pad < 0);
4153
4154 /* Use put_unaligned() because stats may not be aligned for u64. */
4155 put_unaligned(items, &stats[0]);
4156 for (i = 1; i < items; i++)
4157 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4158
4159 memset(&stats[items], 0, pad);
4160 }
4161
4162 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4163 int items, int bytes, size_t syncpoff)
4164 {
4165 int i;
4166 int pad = bytes - sizeof(u64) * items;
4167 BUG_ON(pad < 0);
4168
4169 /* Use put_unaligned() because stats may not be aligned for u64. */
4170 put_unaligned(items, &stats[0]);
4171 for (i = 1; i < items; i++)
4172 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4173
4174 memset(&stats[items], 0, pad);
4175 }
4176
4177 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4178 int bytes)
4179 {
4180 switch (attrtype) {
4181 case IFLA_INET6_STATS:
4182 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4183 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4184 break;
4185 case IFLA_INET6_ICMP6STATS:
4186 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4187 break;
4188 }
4189 }
4190
4191 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4192 {
4193 struct nlattr *nla;
4194 struct ifla_cacheinfo ci;
4195
4196 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4197 goto nla_put_failure;
4198 ci.max_reasm_len = IPV6_MAXPLEN;
4199 ci.tstamp = cstamp_delta(idev->tstamp);
4200 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4201 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4202 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4203 goto nla_put_failure;
4204 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4205 if (nla == NULL)
4206 goto nla_put_failure;
4207 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4208
4209 /* XXX - MC not implemented */
4210
4211 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4212 if (nla == NULL)
4213 goto nla_put_failure;
4214 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4215
4216 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4217 if (nla == NULL)
4218 goto nla_put_failure;
4219 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4220
4221 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4222 if (nla == NULL)
4223 goto nla_put_failure;
4224 read_lock_bh(&idev->lock);
4225 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4226 read_unlock_bh(&idev->lock);
4227
4228 return 0;
4229
4230 nla_put_failure:
4231 return -EMSGSIZE;
4232 }
4233
4234 static size_t inet6_get_link_af_size(const struct net_device *dev)
4235 {
4236 if (!__in6_dev_get(dev))
4237 return 0;
4238
4239 return inet6_ifla6_size();
4240 }
4241
4242 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4243 {
4244 struct inet6_dev *idev = __in6_dev_get(dev);
4245
4246 if (!idev)
4247 return -ENODATA;
4248
4249 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4250 return -EMSGSIZE;
4251
4252 return 0;
4253 }
4254
4255 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4256 {
4257 struct inet6_ifaddr *ifp;
4258 struct net_device *dev = idev->dev;
4259 bool update_rs = false;
4260 struct in6_addr ll_addr;
4261
4262 if (token == NULL)
4263 return -EINVAL;
4264 if (ipv6_addr_any(token))
4265 return -EINVAL;
4266 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4267 return -EINVAL;
4268 if (!ipv6_accept_ra(idev))
4269 return -EINVAL;
4270 if (idev->cnf.rtr_solicits <= 0)
4271 return -EINVAL;
4272
4273 write_lock_bh(&idev->lock);
4274
4275 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4276 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4277
4278 write_unlock_bh(&idev->lock);
4279
4280 if (!idev->dead && (idev->if_flags & IF_READY) &&
4281 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4282 IFA_F_OPTIMISTIC)) {
4283
4284 /* If we're not ready, then normal ifup will take care
4285 * of this. Otherwise, we need to request our rs here.
4286 */
4287 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4288 update_rs = true;
4289 }
4290
4291 write_lock_bh(&idev->lock);
4292
4293 if (update_rs) {
4294 idev->if_flags |= IF_RS_SENT;
4295 idev->rs_probes = 1;
4296 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4297 }
4298
4299 /* Well, that's kinda nasty ... */
4300 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4301 spin_lock(&ifp->lock);
4302 if (ifp->tokenized) {
4303 ifp->valid_lft = 0;
4304 ifp->prefered_lft = 0;
4305 }
4306 spin_unlock(&ifp->lock);
4307 }
4308
4309 write_unlock_bh(&idev->lock);
4310 addrconf_verify(0);
4311 return 0;
4312 }
4313
4314 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4315 {
4316 int err = -EINVAL;
4317 struct inet6_dev *idev = __in6_dev_get(dev);
4318 struct nlattr *tb[IFLA_INET6_MAX + 1];
4319
4320 if (!idev)
4321 return -EAFNOSUPPORT;
4322
4323 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4324 BUG();
4325
4326 if (tb[IFLA_INET6_TOKEN])
4327 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4328
4329 return err;
4330 }
4331
4332 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4333 u32 portid, u32 seq, int event, unsigned int flags)
4334 {
4335 struct net_device *dev = idev->dev;
4336 struct ifinfomsg *hdr;
4337 struct nlmsghdr *nlh;
4338 void *protoinfo;
4339
4340 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4341 if (nlh == NULL)
4342 return -EMSGSIZE;
4343
4344 hdr = nlmsg_data(nlh);
4345 hdr->ifi_family = AF_INET6;
4346 hdr->__ifi_pad = 0;
4347 hdr->ifi_type = dev->type;
4348 hdr->ifi_index = dev->ifindex;
4349 hdr->ifi_flags = dev_get_flags(dev);
4350 hdr->ifi_change = 0;
4351
4352 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4353 (dev->addr_len &&
4354 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4355 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4356 (dev->ifindex != dev->iflink &&
4357 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4358 goto nla_put_failure;
4359 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4360 if (protoinfo == NULL)
4361 goto nla_put_failure;
4362
4363 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4364 goto nla_put_failure;
4365
4366 nla_nest_end(skb, protoinfo);
4367 return nlmsg_end(skb, nlh);
4368
4369 nla_put_failure:
4370 nlmsg_cancel(skb, nlh);
4371 return -EMSGSIZE;
4372 }
4373
4374 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4375 {
4376 struct net *net = sock_net(skb->sk);
4377 int h, s_h;
4378 int idx = 0, s_idx;
4379 struct net_device *dev;
4380 struct inet6_dev *idev;
4381 struct hlist_head *head;
4382
4383 s_h = cb->args[0];
4384 s_idx = cb->args[1];
4385
4386 rcu_read_lock();
4387 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4388 idx = 0;
4389 head = &net->dev_index_head[h];
4390 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4391 if (idx < s_idx)
4392 goto cont;
4393 idev = __in6_dev_get(dev);
4394 if (!idev)
4395 goto cont;
4396 if (inet6_fill_ifinfo(skb, idev,
4397 NETLINK_CB(cb->skb).portid,
4398 cb->nlh->nlmsg_seq,
4399 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4400 goto out;
4401 cont:
4402 idx++;
4403 }
4404 }
4405 out:
4406 rcu_read_unlock();
4407 cb->args[1] = idx;
4408 cb->args[0] = h;
4409
4410 return skb->len;
4411 }
4412
4413 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4414 {
4415 struct sk_buff *skb;
4416 struct net *net = dev_net(idev->dev);
4417 int err = -ENOBUFS;
4418
4419 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4420 if (skb == NULL)
4421 goto errout;
4422
4423 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4424 if (err < 0) {
4425 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4426 WARN_ON(err == -EMSGSIZE);
4427 kfree_skb(skb);
4428 goto errout;
4429 }
4430 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4431 return;
4432 errout:
4433 if (err < 0)
4434 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4435 }
4436
4437 static inline size_t inet6_prefix_nlmsg_size(void)
4438 {
4439 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4440 + nla_total_size(sizeof(struct in6_addr))
4441 + nla_total_size(sizeof(struct prefix_cacheinfo));
4442 }
4443
4444 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4445 struct prefix_info *pinfo, u32 portid, u32 seq,
4446 int event, unsigned int flags)
4447 {
4448 struct prefixmsg *pmsg;
4449 struct nlmsghdr *nlh;
4450 struct prefix_cacheinfo ci;
4451
4452 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4453 if (nlh == NULL)
4454 return -EMSGSIZE;
4455
4456 pmsg = nlmsg_data(nlh);
4457 pmsg->prefix_family = AF_INET6;
4458 pmsg->prefix_pad1 = 0;
4459 pmsg->prefix_pad2 = 0;
4460 pmsg->prefix_ifindex = idev->dev->ifindex;
4461 pmsg->prefix_len = pinfo->prefix_len;
4462 pmsg->prefix_type = pinfo->type;
4463 pmsg->prefix_pad3 = 0;
4464 pmsg->prefix_flags = 0;
4465 if (pinfo->onlink)
4466 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4467 if (pinfo->autoconf)
4468 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4469
4470 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4471 goto nla_put_failure;
4472 ci.preferred_time = ntohl(pinfo->prefered);
4473 ci.valid_time = ntohl(pinfo->valid);
4474 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4475 goto nla_put_failure;
4476 return nlmsg_end(skb, nlh);
4477
4478 nla_put_failure:
4479 nlmsg_cancel(skb, nlh);
4480 return -EMSGSIZE;
4481 }
4482
4483 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4484 struct prefix_info *pinfo)
4485 {
4486 struct sk_buff *skb;
4487 struct net *net = dev_net(idev->dev);
4488 int err = -ENOBUFS;
4489
4490 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4491 if (skb == NULL)
4492 goto errout;
4493
4494 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4495 if (err < 0) {
4496 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4497 WARN_ON(err == -EMSGSIZE);
4498 kfree_skb(skb);
4499 goto errout;
4500 }
4501 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4502 return;
4503 errout:
4504 if (err < 0)
4505 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4506 }
4507
4508 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4509 {
4510 write_lock_bh(&ifp->idev->lock);
4511 spin_lock(&ifp->lock);
4512 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4513 IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4514 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4515 ifp->idev->valid_ll_addr_cnt += count;
4516 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4517 spin_unlock(&ifp->lock);
4518 write_unlock_bh(&ifp->idev->lock);
4519 }
4520
4521 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4522 {
4523 struct net *net = dev_net(ifp->idev->dev);
4524
4525 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4526
4527 switch (event) {
4528 case RTM_NEWADDR:
4529 update_valid_ll_addr_cnt(ifp, 1);
4530
4531 /*
4532 * If the address was optimistic
4533 * we inserted the route at the start of
4534 * our DAD process, so we don't need
4535 * to do it again
4536 */
4537 if (!(ifp->rt->rt6i_node))
4538 ip6_ins_rt(ifp->rt);
4539 if (ifp->idev->cnf.forwarding)
4540 addrconf_join_anycast(ifp);
4541 if (!ipv6_addr_any(&ifp->peer_addr))
4542 addrconf_prefix_route(&ifp->peer_addr, 128,
4543 ifp->idev->dev, 0, 0);
4544 break;
4545 case RTM_DELADDR:
4546 update_valid_ll_addr_cnt(ifp, -1);
4547
4548 if (ifp->idev->cnf.forwarding)
4549 addrconf_leave_anycast(ifp);
4550 addrconf_leave_solict(ifp->idev, &ifp->addr);
4551 if (!ipv6_addr_any(&ifp->peer_addr)) {
4552 struct rt6_info *rt;
4553 struct net_device *dev = ifp->idev->dev;
4554
4555 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4556 dev->ifindex, 1);
4557 if (rt) {
4558 dst_hold(&rt->dst);
4559 if (ip6_del_rt(rt))
4560 dst_free(&rt->dst);
4561 }
4562 }
4563 dst_hold(&ifp->rt->dst);
4564
4565 if (ip6_del_rt(ifp->rt))
4566 dst_free(&ifp->rt->dst);
4567 break;
4568 }
4569 atomic_inc(&net->ipv6.dev_addr_genid);
4570 rt_genid_bump_ipv6(net);
4571 }
4572
4573 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4574 {
4575 rcu_read_lock_bh();
4576 if (likely(ifp->idev->dead == 0))
4577 __ipv6_ifa_notify(event, ifp);
4578 rcu_read_unlock_bh();
4579 }
4580
4581 #ifdef CONFIG_SYSCTL
4582
4583 static
4584 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4585 void __user *buffer, size_t *lenp, loff_t *ppos)
4586 {
4587 int *valp = ctl->data;
4588 int val = *valp;
4589 loff_t pos = *ppos;
4590 struct ctl_table lctl;
4591 int ret;
4592
4593 /*
4594 * ctl->data points to idev->cnf.forwarding, we should
4595 * not modify it until we get the rtnl lock.
4596 */
4597 lctl = *ctl;
4598 lctl.data = &val;
4599
4600 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4601
4602 if (write)
4603 ret = addrconf_fixup_forwarding(ctl, valp, val);
4604 if (ret)
4605 *ppos = pos;
4606 return ret;
4607 }
4608
4609 static void dev_disable_change(struct inet6_dev *idev)
4610 {
4611 struct netdev_notifier_info info;
4612
4613 if (!idev || !idev->dev)
4614 return;
4615
4616 netdev_notifier_info_init(&info, idev->dev);
4617 if (idev->cnf.disable_ipv6)
4618 addrconf_notify(NULL, NETDEV_DOWN, &info);
4619 else
4620 addrconf_notify(NULL, NETDEV_UP, &info);
4621 }
4622
4623 static void addrconf_disable_change(struct net *net, __s32 newf)
4624 {
4625 struct net_device *dev;
4626 struct inet6_dev *idev;
4627
4628 rcu_read_lock();
4629 for_each_netdev_rcu(net, dev) {
4630 idev = __in6_dev_get(dev);
4631 if (idev) {
4632 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4633 idev->cnf.disable_ipv6 = newf;
4634 if (changed)
4635 dev_disable_change(idev);
4636 }
4637 }
4638 rcu_read_unlock();
4639 }
4640
4641 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4642 {
4643 struct net *net;
4644 int old;
4645
4646 if (!rtnl_trylock())
4647 return restart_syscall();
4648
4649 net = (struct net *)table->extra2;
4650 old = *p;
4651 *p = newf;
4652
4653 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4654 rtnl_unlock();
4655 return 0;
4656 }
4657
4658 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4659 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4660 addrconf_disable_change(net, newf);
4661 } else if ((!newf) ^ (!old))
4662 dev_disable_change((struct inet6_dev *)table->extra1);
4663
4664 rtnl_unlock();
4665 return 0;
4666 }
4667
4668 static
4669 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4670 void __user *buffer, size_t *lenp, loff_t *ppos)
4671 {
4672 int *valp = ctl->data;
4673 int val = *valp;
4674 loff_t pos = *ppos;
4675 struct ctl_table lctl;
4676 int ret;
4677
4678 /*
4679 * ctl->data points to idev->cnf.disable_ipv6, we should
4680 * not modify it until we get the rtnl lock.
4681 */
4682 lctl = *ctl;
4683 lctl.data = &val;
4684
4685 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4686
4687 if (write)
4688 ret = addrconf_disable_ipv6(ctl, valp, val);
4689 if (ret)
4690 *ppos = pos;
4691 return ret;
4692 }
4693
4694 static struct addrconf_sysctl_table
4695 {
4696 struct ctl_table_header *sysctl_header;
4697 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4698 } addrconf_sysctl __read_mostly = {
4699 .sysctl_header = NULL,
4700 .addrconf_vars = {
4701 {
4702 .procname = "forwarding",
4703 .data = &ipv6_devconf.forwarding,
4704 .maxlen = sizeof(int),
4705 .mode = 0644,
4706 .proc_handler = addrconf_sysctl_forward,
4707 },
4708 {
4709 .procname = "hop_limit",
4710 .data = &ipv6_devconf.hop_limit,
4711 .maxlen = sizeof(int),
4712 .mode = 0644,
4713 .proc_handler = proc_dointvec,
4714 },
4715 {
4716 .procname = "mtu",
4717 .data = &ipv6_devconf.mtu6,
4718 .maxlen = sizeof(int),
4719 .mode = 0644,
4720 .proc_handler = proc_dointvec,
4721 },
4722 {
4723 .procname = "accept_ra",
4724 .data = &ipv6_devconf.accept_ra,
4725 .maxlen = sizeof(int),
4726 .mode = 0644,
4727 .proc_handler = proc_dointvec,
4728 },
4729 {
4730 .procname = "accept_redirects",
4731 .data = &ipv6_devconf.accept_redirects,
4732 .maxlen = sizeof(int),
4733 .mode = 0644,
4734 .proc_handler = proc_dointvec,
4735 },
4736 {
4737 .procname = "autoconf",
4738 .data = &ipv6_devconf.autoconf,
4739 .maxlen = sizeof(int),
4740 .mode = 0644,
4741 .proc_handler = proc_dointvec,
4742 },
4743 {
4744 .procname = "dad_transmits",
4745 .data = &ipv6_devconf.dad_transmits,
4746 .maxlen = sizeof(int),
4747 .mode = 0644,
4748 .proc_handler = proc_dointvec,
4749 },
4750 {
4751 .procname = "router_solicitations",
4752 .data = &ipv6_devconf.rtr_solicits,
4753 .maxlen = sizeof(int),
4754 .mode = 0644,
4755 .proc_handler = proc_dointvec,
4756 },
4757 {
4758 .procname = "router_solicitation_interval",
4759 .data = &ipv6_devconf.rtr_solicit_interval,
4760 .maxlen = sizeof(int),
4761 .mode = 0644,
4762 .proc_handler = proc_dointvec_jiffies,
4763 },
4764 {
4765 .procname = "router_solicitation_delay",
4766 .data = &ipv6_devconf.rtr_solicit_delay,
4767 .maxlen = sizeof(int),
4768 .mode = 0644,
4769 .proc_handler = proc_dointvec_jiffies,
4770 },
4771 {
4772 .procname = "force_mld_version",
4773 .data = &ipv6_devconf.force_mld_version,
4774 .maxlen = sizeof(int),
4775 .mode = 0644,
4776 .proc_handler = proc_dointvec,
4777 },
4778 {
4779 .procname = "mldv1_unsolicited_report_interval",
4780 .data =
4781 &ipv6_devconf.mldv1_unsolicited_report_interval,
4782 .maxlen = sizeof(int),
4783 .mode = 0644,
4784 .proc_handler = proc_dointvec_ms_jiffies,
4785 },
4786 {
4787 .procname = "mldv2_unsolicited_report_interval",
4788 .data =
4789 &ipv6_devconf.mldv2_unsolicited_report_interval,
4790 .maxlen = sizeof(int),
4791 .mode = 0644,
4792 .proc_handler = proc_dointvec_ms_jiffies,
4793 },
4794 {
4795 .procname = "use_tempaddr",
4796 .data = &ipv6_devconf.use_tempaddr,
4797 .maxlen = sizeof(int),
4798 .mode = 0644,
4799 .proc_handler = proc_dointvec,
4800 },
4801 {
4802 .procname = "temp_valid_lft",
4803 .data = &ipv6_devconf.temp_valid_lft,
4804 .maxlen = sizeof(int),
4805 .mode = 0644,
4806 .proc_handler = proc_dointvec,
4807 },
4808 {
4809 .procname = "temp_prefered_lft",
4810 .data = &ipv6_devconf.temp_prefered_lft,
4811 .maxlen = sizeof(int),
4812 .mode = 0644,
4813 .proc_handler = proc_dointvec,
4814 },
4815 {
4816 .procname = "regen_max_retry",
4817 .data = &ipv6_devconf.regen_max_retry,
4818 .maxlen = sizeof(int),
4819 .mode = 0644,
4820 .proc_handler = proc_dointvec,
4821 },
4822 {
4823 .procname = "max_desync_factor",
4824 .data = &ipv6_devconf.max_desync_factor,
4825 .maxlen = sizeof(int),
4826 .mode = 0644,
4827 .proc_handler = proc_dointvec,
4828 },
4829 {
4830 .procname = "max_addresses",
4831 .data = &ipv6_devconf.max_addresses,
4832 .maxlen = sizeof(int),
4833 .mode = 0644,
4834 .proc_handler = proc_dointvec,
4835 },
4836 {
4837 .procname = "accept_ra_defrtr",
4838 .data = &ipv6_devconf.accept_ra_defrtr,
4839 .maxlen = sizeof(int),
4840 .mode = 0644,
4841 .proc_handler = proc_dointvec,
4842 },
4843 {
4844 .procname = "accept_ra_pinfo",
4845 .data = &ipv6_devconf.accept_ra_pinfo,
4846 .maxlen = sizeof(int),
4847 .mode = 0644,
4848 .proc_handler = proc_dointvec,
4849 },
4850 #ifdef CONFIG_IPV6_ROUTER_PREF
4851 {
4852 .procname = "accept_ra_rtr_pref",
4853 .data = &ipv6_devconf.accept_ra_rtr_pref,
4854 .maxlen = sizeof(int),
4855 .mode = 0644,
4856 .proc_handler = proc_dointvec,
4857 },
4858 {
4859 .procname = "router_probe_interval",
4860 .data = &ipv6_devconf.rtr_probe_interval,
4861 .maxlen = sizeof(int),
4862 .mode = 0644,
4863 .proc_handler = proc_dointvec_jiffies,
4864 },
4865 #ifdef CONFIG_IPV6_ROUTE_INFO
4866 {
4867 .procname = "accept_ra_rt_info_max_plen",
4868 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4869 .maxlen = sizeof(int),
4870 .mode = 0644,
4871 .proc_handler = proc_dointvec,
4872 },
4873 #endif
4874 #endif
4875 {
4876 .procname = "proxy_ndp",
4877 .data = &ipv6_devconf.proxy_ndp,
4878 .maxlen = sizeof(int),
4879 .mode = 0644,
4880 .proc_handler = proc_dointvec,
4881 },
4882 {
4883 .procname = "accept_source_route",
4884 .data = &ipv6_devconf.accept_source_route,
4885 .maxlen = sizeof(int),
4886 .mode = 0644,
4887 .proc_handler = proc_dointvec,
4888 },
4889 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4890 {
4891 .procname = "optimistic_dad",
4892 .data = &ipv6_devconf.optimistic_dad,
4893 .maxlen = sizeof(int),
4894 .mode = 0644,
4895 .proc_handler = proc_dointvec,
4896
4897 },
4898 #endif
4899 #ifdef CONFIG_IPV6_MROUTE
4900 {
4901 .procname = "mc_forwarding",
4902 .data = &ipv6_devconf.mc_forwarding,
4903 .maxlen = sizeof(int),
4904 .mode = 0444,
4905 .proc_handler = proc_dointvec,
4906 },
4907 #endif
4908 {
4909 .procname = "disable_ipv6",
4910 .data = &ipv6_devconf.disable_ipv6,
4911 .maxlen = sizeof(int),
4912 .mode = 0644,
4913 .proc_handler = addrconf_sysctl_disable,
4914 },
4915 {
4916 .procname = "accept_dad",
4917 .data = &ipv6_devconf.accept_dad,
4918 .maxlen = sizeof(int),
4919 .mode = 0644,
4920 .proc_handler = proc_dointvec,
4921 },
4922 {
4923 .procname = "force_tllao",
4924 .data = &ipv6_devconf.force_tllao,
4925 .maxlen = sizeof(int),
4926 .mode = 0644,
4927 .proc_handler = proc_dointvec
4928 },
4929 {
4930 .procname = "ndisc_notify",
4931 .data = &ipv6_devconf.ndisc_notify,
4932 .maxlen = sizeof(int),
4933 .mode = 0644,
4934 .proc_handler = proc_dointvec
4935 },
4936 {
4937 .procname = "suppress_frag_ndisc",
4938 .data = &ipv6_devconf.suppress_frag_ndisc,
4939 .maxlen = sizeof(int),
4940 .mode = 0644,
4941 .proc_handler = proc_dointvec
4942 },
4943 {
4944 /* sentinel */
4945 }
4946 },
4947 };
4948
4949 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4950 struct inet6_dev *idev, struct ipv6_devconf *p)
4951 {
4952 int i;
4953 struct addrconf_sysctl_table *t;
4954 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4955
4956 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4957 if (t == NULL)
4958 goto out;
4959
4960 for (i = 0; t->addrconf_vars[i].data; i++) {
4961 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4962 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4963 t->addrconf_vars[i].extra2 = net;
4964 }
4965
4966 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4967
4968 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4969 if (t->sysctl_header == NULL)
4970 goto free;
4971
4972 p->sysctl = t;
4973 return 0;
4974
4975 free:
4976 kfree(t);
4977 out:
4978 return -ENOBUFS;
4979 }
4980
4981 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4982 {
4983 struct addrconf_sysctl_table *t;
4984
4985 if (p->sysctl == NULL)
4986 return;
4987
4988 t = p->sysctl;
4989 p->sysctl = NULL;
4990 unregister_net_sysctl_table(t->sysctl_header);
4991 kfree(t);
4992 }
4993
4994 static void addrconf_sysctl_register(struct inet6_dev *idev)
4995 {
4996 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4997 &ndisc_ifinfo_sysctl_change);
4998 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4999 idev, &idev->cnf);
5000 }
5001
5002 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5003 {
5004 __addrconf_sysctl_unregister(&idev->cnf);
5005 neigh_sysctl_unregister(idev->nd_parms);
5006 }
5007
5008
5009 #endif
5010
5011 static int __net_init addrconf_init_net(struct net *net)
5012 {
5013 int err = -ENOMEM;
5014 struct ipv6_devconf *all, *dflt;
5015
5016 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5017 if (all == NULL)
5018 goto err_alloc_all;
5019
5020 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5021 if (dflt == NULL)
5022 goto err_alloc_dflt;
5023
5024 /* these will be inherited by all namespaces */
5025 dflt->autoconf = ipv6_defaults.autoconf;
5026 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5027
5028 net->ipv6.devconf_all = all;
5029 net->ipv6.devconf_dflt = dflt;
5030
5031 #ifdef CONFIG_SYSCTL
5032 err = __addrconf_sysctl_register(net, "all", NULL, all);
5033 if (err < 0)
5034 goto err_reg_all;
5035
5036 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5037 if (err < 0)
5038 goto err_reg_dflt;
5039 #endif
5040 return 0;
5041
5042 #ifdef CONFIG_SYSCTL
5043 err_reg_dflt:
5044 __addrconf_sysctl_unregister(all);
5045 err_reg_all:
5046 kfree(dflt);
5047 #endif
5048 err_alloc_dflt:
5049 kfree(all);
5050 err_alloc_all:
5051 return err;
5052 }
5053
5054 static void __net_exit addrconf_exit_net(struct net *net)
5055 {
5056 #ifdef CONFIG_SYSCTL
5057 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5058 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5059 #endif
5060 if (!net_eq(net, &init_net)) {
5061 kfree(net->ipv6.devconf_dflt);
5062 kfree(net->ipv6.devconf_all);
5063 }
5064 }
5065
5066 static struct pernet_operations addrconf_ops = {
5067 .init = addrconf_init_net,
5068 .exit = addrconf_exit_net,
5069 };
5070
5071 static struct rtnl_af_ops inet6_ops = {
5072 .family = AF_INET6,
5073 .fill_link_af = inet6_fill_link_af,
5074 .get_link_af_size = inet6_get_link_af_size,
5075 .set_link_af = inet6_set_link_af,
5076 };
5077
5078 /*
5079 * Init / cleanup code
5080 */
5081
5082 int __init addrconf_init(void)
5083 {
5084 int i, err;
5085
5086 err = ipv6_addr_label_init();
5087 if (err < 0) {
5088 pr_crit("%s: cannot initialize default policy table: %d\n",
5089 __func__, err);
5090 goto out;
5091 }
5092
5093 err = register_pernet_subsys(&addrconf_ops);
5094 if (err < 0)
5095 goto out_addrlabel;
5096
5097 /* The addrconf netdev notifier requires that loopback_dev
5098 * has it's ipv6 private information allocated and setup
5099 * before it can bring up and give link-local addresses
5100 * to other devices which are up.
5101 *
5102 * Unfortunately, loopback_dev is not necessarily the first
5103 * entry in the global dev_base list of net devices. In fact,
5104 * it is likely to be the very last entry on that list.
5105 * So this causes the notifier registry below to try and
5106 * give link-local addresses to all devices besides loopback_dev
5107 * first, then loopback_dev, which cases all the non-loopback_dev
5108 * devices to fail to get a link-local address.
5109 *
5110 * So, as a temporary fix, allocate the ipv6 structure for
5111 * loopback_dev first by hand.
5112 * Longer term, all of the dependencies ipv6 has upon the loopback
5113 * device and it being up should be removed.
5114 */
5115 rtnl_lock();
5116 if (!ipv6_add_dev(init_net.loopback_dev))
5117 err = -ENOMEM;
5118 rtnl_unlock();
5119 if (err)
5120 goto errlo;
5121
5122 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5123 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5124
5125 register_netdevice_notifier(&ipv6_dev_notf);
5126
5127 addrconf_verify(0);
5128
5129 err = rtnl_af_register(&inet6_ops);
5130 if (err < 0)
5131 goto errout_af;
5132
5133 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5134 NULL);
5135 if (err < 0)
5136 goto errout;
5137
5138 /* Only the first call to __rtnl_register can fail */
5139 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5140 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5141 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5142 inet6_dump_ifaddr, NULL);
5143 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5144 inet6_dump_ifmcaddr, NULL);
5145 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5146 inet6_dump_ifacaddr, NULL);
5147 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5148 inet6_netconf_dump_devconf, NULL);
5149
5150 ipv6_addr_label_rtnl_register();
5151
5152 return 0;
5153 errout:
5154 rtnl_af_unregister(&inet6_ops);
5155 errout_af:
5156 unregister_netdevice_notifier(&ipv6_dev_notf);
5157 errlo:
5158 unregister_pernet_subsys(&addrconf_ops);
5159 out_addrlabel:
5160 ipv6_addr_label_cleanup();
5161 out:
5162 return err;
5163 }
5164
5165 void addrconf_cleanup(void)
5166 {
5167 struct net_device *dev;
5168 int i;
5169
5170 unregister_netdevice_notifier(&ipv6_dev_notf);
5171 unregister_pernet_subsys(&addrconf_ops);
5172 ipv6_addr_label_cleanup();
5173
5174 rtnl_lock();
5175
5176 __rtnl_af_unregister(&inet6_ops);
5177
5178 /* clean dev list */
5179 for_each_netdev(&init_net, dev) {
5180 if (__in6_dev_get(dev) == NULL)
5181 continue;
5182 addrconf_ifdown(dev, 1);
5183 }
5184 addrconf_ifdown(init_net.loopback_dev, 2);
5185
5186 /*
5187 * Check hash table.
5188 */
5189 spin_lock_bh(&addrconf_hash_lock);
5190 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5191 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5192 spin_unlock_bh(&addrconf_hash_lock);
5193
5194 del_timer(&addr_chk_timer);
5195 rtnl_unlock();
5196 }
Linux kernel - Deliverables
This page took 0.196921 seconds and 6 git commands to generate.