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ipv6 addrconf: extend ifa_flags to u32
[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 u32 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 u32 banned_flags)
1428 {
1429 struct inet6_dev *idev;
1430 int err = -EADDRNOTAVAIL;
1431
1432 rcu_read_lock();
1433 idev = __in6_dev_get(dev);
1434 if (idev) {
1435 read_lock_bh(&idev->lock);
1436 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1437 read_unlock_bh(&idev->lock);
1438 }
1439 rcu_read_unlock();
1440 return err;
1441 }
1442
1443 static int ipv6_count_addresses(struct inet6_dev *idev)
1444 {
1445 int cnt = 0;
1446 struct inet6_ifaddr *ifp;
1447
1448 read_lock_bh(&idev->lock);
1449 list_for_each_entry(ifp, &idev->addr_list, if_list)
1450 cnt++;
1451 read_unlock_bh(&idev->lock);
1452 return cnt;
1453 }
1454
1455 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1456 const struct net_device *dev, int strict)
1457 {
1458 struct inet6_ifaddr *ifp;
1459 unsigned int hash = inet6_addr_hash(addr);
1460
1461 rcu_read_lock_bh();
1462 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1463 if (!net_eq(dev_net(ifp->idev->dev), net))
1464 continue;
1465 if (ipv6_addr_equal(&ifp->addr, addr) &&
1466 !(ifp->flags&IFA_F_TENTATIVE) &&
1467 (dev == NULL || ifp->idev->dev == dev ||
1468 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1469 rcu_read_unlock_bh();
1470 return 1;
1471 }
1472 }
1473
1474 rcu_read_unlock_bh();
1475 return 0;
1476 }
1477 EXPORT_SYMBOL(ipv6_chk_addr);
1478
1479 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1480 struct net_device *dev)
1481 {
1482 unsigned int hash = inet6_addr_hash(addr);
1483 struct inet6_ifaddr *ifp;
1484
1485 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1486 if (!net_eq(dev_net(ifp->idev->dev), net))
1487 continue;
1488 if (ipv6_addr_equal(&ifp->addr, addr)) {
1489 if (dev == NULL || ifp->idev->dev == dev)
1490 return true;
1491 }
1492 }
1493 return false;
1494 }
1495
1496 /* Compares an address/prefix_len with addresses on device @dev.
1497 * If one is found it returns true.
1498 */
1499 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1500 const unsigned int prefix_len, struct net_device *dev)
1501 {
1502 struct inet6_dev *idev;
1503 struct inet6_ifaddr *ifa;
1504 bool ret = false;
1505
1506 rcu_read_lock();
1507 idev = __in6_dev_get(dev);
1508 if (idev) {
1509 read_lock_bh(&idev->lock);
1510 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1511 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1512 if (ret)
1513 break;
1514 }
1515 read_unlock_bh(&idev->lock);
1516 }
1517 rcu_read_unlock();
1518
1519 return ret;
1520 }
1521 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1522
1523 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1524 {
1525 struct inet6_dev *idev;
1526 struct inet6_ifaddr *ifa;
1527 int onlink;
1528
1529 onlink = 0;
1530 rcu_read_lock();
1531 idev = __in6_dev_get(dev);
1532 if (idev) {
1533 read_lock_bh(&idev->lock);
1534 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1535 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1536 ifa->prefix_len);
1537 if (onlink)
1538 break;
1539 }
1540 read_unlock_bh(&idev->lock);
1541 }
1542 rcu_read_unlock();
1543 return onlink;
1544 }
1545 EXPORT_SYMBOL(ipv6_chk_prefix);
1546
1547 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1548 struct net_device *dev, int strict)
1549 {
1550 struct inet6_ifaddr *ifp, *result = NULL;
1551 unsigned int hash = inet6_addr_hash(addr);
1552
1553 rcu_read_lock_bh();
1554 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1555 if (!net_eq(dev_net(ifp->idev->dev), net))
1556 continue;
1557 if (ipv6_addr_equal(&ifp->addr, addr)) {
1558 if (dev == NULL || ifp->idev->dev == dev ||
1559 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1560 result = ifp;
1561 in6_ifa_hold(ifp);
1562 break;
1563 }
1564 }
1565 }
1566 rcu_read_unlock_bh();
1567
1568 return result;
1569 }
1570
1571 /* Gets referenced address, destroys ifaddr */
1572
1573 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1574 {
1575 if (ifp->flags&IFA_F_PERMANENT) {
1576 spin_lock_bh(&ifp->lock);
1577 addrconf_del_dad_timer(ifp);
1578 ifp->flags |= IFA_F_TENTATIVE;
1579 if (dad_failed)
1580 ifp->flags |= IFA_F_DADFAILED;
1581 spin_unlock_bh(&ifp->lock);
1582 if (dad_failed)
1583 ipv6_ifa_notify(0, ifp);
1584 in6_ifa_put(ifp);
1585 } else if (ifp->flags&IFA_F_TEMPORARY) {
1586 struct inet6_ifaddr *ifpub;
1587 spin_lock_bh(&ifp->lock);
1588 ifpub = ifp->ifpub;
1589 if (ifpub) {
1590 in6_ifa_hold(ifpub);
1591 spin_unlock_bh(&ifp->lock);
1592 ipv6_create_tempaddr(ifpub, ifp);
1593 in6_ifa_put(ifpub);
1594 } else {
1595 spin_unlock_bh(&ifp->lock);
1596 }
1597 ipv6_del_addr(ifp);
1598 } else
1599 ipv6_del_addr(ifp);
1600 }
1601
1602 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1603 {
1604 int err = -ENOENT;
1605
1606 spin_lock(&ifp->state_lock);
1607 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1608 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1609 err = 0;
1610 }
1611 spin_unlock(&ifp->state_lock);
1612
1613 return err;
1614 }
1615
1616 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1617 {
1618 struct inet6_dev *idev = ifp->idev;
1619
1620 if (addrconf_dad_end(ifp)) {
1621 in6_ifa_put(ifp);
1622 return;
1623 }
1624
1625 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1626 ifp->idev->dev->name, &ifp->addr);
1627
1628 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1629 struct in6_addr addr;
1630
1631 addr.s6_addr32[0] = htonl(0xfe800000);
1632 addr.s6_addr32[1] = 0;
1633
1634 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1635 ipv6_addr_equal(&ifp->addr, &addr)) {
1636 /* DAD failed for link-local based on MAC address */
1637 idev->cnf.disable_ipv6 = 1;
1638
1639 pr_info("%s: IPv6 being disabled!\n",
1640 ifp->idev->dev->name);
1641 }
1642 }
1643
1644 addrconf_dad_stop(ifp, 1);
1645 }
1646
1647 /* Join to solicited addr multicast group. */
1648
1649 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1650 {
1651 struct in6_addr maddr;
1652
1653 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1654 return;
1655
1656 addrconf_addr_solict_mult(addr, &maddr);
1657 ipv6_dev_mc_inc(dev, &maddr);
1658 }
1659
1660 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1661 {
1662 struct in6_addr maddr;
1663
1664 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1665 return;
1666
1667 addrconf_addr_solict_mult(addr, &maddr);
1668 __ipv6_dev_mc_dec(idev, &maddr);
1669 }
1670
1671 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1672 {
1673 struct in6_addr addr;
1674 if (ifp->prefix_len == 127) /* RFC 6164 */
1675 return;
1676 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1677 if (ipv6_addr_any(&addr))
1678 return;
1679 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1680 }
1681
1682 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1683 {
1684 struct in6_addr addr;
1685 if (ifp->prefix_len == 127) /* RFC 6164 */
1686 return;
1687 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1688 if (ipv6_addr_any(&addr))
1689 return;
1690 __ipv6_dev_ac_dec(ifp->idev, &addr);
1691 }
1692
1693 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1694 {
1695 if (dev->addr_len != ETH_ALEN)
1696 return -1;
1697 memcpy(eui, dev->dev_addr, 3);
1698 memcpy(eui + 5, dev->dev_addr + 3, 3);
1699
1700 /*
1701 * The zSeries OSA network cards can be shared among various
1702 * OS instances, but the OSA cards have only one MAC address.
1703 * This leads to duplicate address conflicts in conjunction
1704 * with IPv6 if more than one instance uses the same card.
1705 *
1706 * The driver for these cards can deliver a unique 16-bit
1707 * identifier for each instance sharing the same card. It is
1708 * placed instead of 0xFFFE in the interface identifier. The
1709 * "u" bit of the interface identifier is not inverted in this
1710 * case. Hence the resulting interface identifier has local
1711 * scope according to RFC2373.
1712 */
1713 if (dev->dev_id) {
1714 eui[3] = (dev->dev_id >> 8) & 0xFF;
1715 eui[4] = dev->dev_id & 0xFF;
1716 } else {
1717 eui[3] = 0xFF;
1718 eui[4] = 0xFE;
1719 eui[0] ^= 2;
1720 }
1721 return 0;
1722 }
1723
1724 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1725 {
1726 if (dev->addr_len != IEEE802154_ADDR_LEN)
1727 return -1;
1728 memcpy(eui, dev->dev_addr, 8);
1729 eui[0] ^= 2;
1730 return 0;
1731 }
1732
1733 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1734 {
1735 union fwnet_hwaddr *ha;
1736
1737 if (dev->addr_len != FWNET_ALEN)
1738 return -1;
1739
1740 ha = (union fwnet_hwaddr *)dev->dev_addr;
1741
1742 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1743 eui[0] ^= 2;
1744 return 0;
1745 }
1746
1747 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1748 {
1749 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1750 if (dev->addr_len != ARCNET_ALEN)
1751 return -1;
1752 memset(eui, 0, 7);
1753 eui[7] = *(u8 *)dev->dev_addr;
1754 return 0;
1755 }
1756
1757 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1758 {
1759 if (dev->addr_len != INFINIBAND_ALEN)
1760 return -1;
1761 memcpy(eui, dev->dev_addr + 12, 8);
1762 eui[0] |= 2;
1763 return 0;
1764 }
1765
1766 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1767 {
1768 if (addr == 0)
1769 return -1;
1770 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1771 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1772 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1773 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1774 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1775 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1776 eui[1] = 0;
1777 eui[2] = 0x5E;
1778 eui[3] = 0xFE;
1779 memcpy(eui + 4, &addr, 4);
1780 return 0;
1781 }
1782
1783 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1784 {
1785 if (dev->priv_flags & IFF_ISATAP)
1786 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1787 return -1;
1788 }
1789
1790 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1791 {
1792 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1793 }
1794
1795 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1796 {
1797 memcpy(eui, dev->perm_addr, 3);
1798 memcpy(eui + 5, dev->perm_addr + 3, 3);
1799 eui[3] = 0xFF;
1800 eui[4] = 0xFE;
1801 eui[0] ^= 2;
1802 return 0;
1803 }
1804
1805 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1806 {
1807 switch (dev->type) {
1808 case ARPHRD_ETHER:
1809 case ARPHRD_FDDI:
1810 return addrconf_ifid_eui48(eui, dev);
1811 case ARPHRD_ARCNET:
1812 return addrconf_ifid_arcnet(eui, dev);
1813 case ARPHRD_INFINIBAND:
1814 return addrconf_ifid_infiniband(eui, dev);
1815 case ARPHRD_SIT:
1816 return addrconf_ifid_sit(eui, dev);
1817 case ARPHRD_IPGRE:
1818 return addrconf_ifid_gre(eui, dev);
1819 case ARPHRD_IEEE802154:
1820 return addrconf_ifid_eui64(eui, dev);
1821 case ARPHRD_IEEE1394:
1822 return addrconf_ifid_ieee1394(eui, dev);
1823 case ARPHRD_TUNNEL6:
1824 return addrconf_ifid_ip6tnl(eui, dev);
1825 }
1826 return -1;
1827 }
1828
1829 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1830 {
1831 int err = -1;
1832 struct inet6_ifaddr *ifp;
1833
1834 read_lock_bh(&idev->lock);
1835 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1836 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1837 memcpy(eui, ifp->addr.s6_addr+8, 8);
1838 err = 0;
1839 break;
1840 }
1841 }
1842 read_unlock_bh(&idev->lock);
1843 return err;
1844 }
1845
1846 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1847 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1848 {
1849 regen:
1850 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1851 idev->rndid[0] &= ~0x02;
1852
1853 /*
1854 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1855 * check if generated address is not inappropriate
1856 *
1857 * - Reserved subnet anycast (RFC 2526)
1858 * 11111101 11....11 1xxxxxxx
1859 * - ISATAP (RFC4214) 6.1
1860 * 00-00-5E-FE-xx-xx-xx-xx
1861 * - value 0
1862 * - XXX: already assigned to an address on the device
1863 */
1864 if (idev->rndid[0] == 0xfd &&
1865 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1866 (idev->rndid[7]&0x80))
1867 goto regen;
1868 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1869 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1870 goto regen;
1871 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1872 goto regen;
1873 }
1874 }
1875
1876 static void ipv6_regen_rndid(unsigned long data)
1877 {
1878 struct inet6_dev *idev = (struct inet6_dev *) data;
1879 unsigned long expires;
1880
1881 rcu_read_lock_bh();
1882 write_lock_bh(&idev->lock);
1883
1884 if (idev->dead)
1885 goto out;
1886
1887 __ipv6_regen_rndid(idev);
1888
1889 expires = jiffies +
1890 idev->cnf.temp_prefered_lft * HZ -
1891 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1892 idev->cnf.max_desync_factor * HZ;
1893 if (time_before(expires, jiffies)) {
1894 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1895 __func__, idev->dev->name);
1896 goto out;
1897 }
1898
1899 if (!mod_timer(&idev->regen_timer, expires))
1900 in6_dev_hold(idev);
1901
1902 out:
1903 write_unlock_bh(&idev->lock);
1904 rcu_read_unlock_bh();
1905 in6_dev_put(idev);
1906 }
1907
1908 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1909 {
1910 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1911 __ipv6_regen_rndid(idev);
1912 }
1913
1914 /*
1915 * Add prefix route.
1916 */
1917
1918 static void
1919 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1920 unsigned long expires, u32 flags)
1921 {
1922 struct fib6_config cfg = {
1923 .fc_table = RT6_TABLE_PREFIX,
1924 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1925 .fc_ifindex = dev->ifindex,
1926 .fc_expires = expires,
1927 .fc_dst_len = plen,
1928 .fc_flags = RTF_UP | flags,
1929 .fc_nlinfo.nl_net = dev_net(dev),
1930 .fc_protocol = RTPROT_KERNEL,
1931 };
1932
1933 cfg.fc_dst = *pfx;
1934
1935 /* Prevent useless cloning on PtP SIT.
1936 This thing is done here expecting that the whole
1937 class of non-broadcast devices need not cloning.
1938 */
1939 #if IS_ENABLED(CONFIG_IPV6_SIT)
1940 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1941 cfg.fc_flags |= RTF_NONEXTHOP;
1942 #endif
1943
1944 ip6_route_add(&cfg);
1945 }
1946
1947
1948 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1949 int plen,
1950 const struct net_device *dev,
1951 u32 flags, u32 noflags)
1952 {
1953 struct fib6_node *fn;
1954 struct rt6_info *rt = NULL;
1955 struct fib6_table *table;
1956
1957 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1958 if (table == NULL)
1959 return NULL;
1960
1961 read_lock_bh(&table->tb6_lock);
1962 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1963 if (!fn)
1964 goto out;
1965 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1966 if (rt->dst.dev->ifindex != dev->ifindex)
1967 continue;
1968 if ((rt->rt6i_flags & flags) != flags)
1969 continue;
1970 if ((rt->rt6i_flags & noflags) != 0)
1971 continue;
1972 dst_hold(&rt->dst);
1973 break;
1974 }
1975 out:
1976 read_unlock_bh(&table->tb6_lock);
1977 return rt;
1978 }
1979
1980
1981 /* Create "default" multicast route to the interface */
1982
1983 static void addrconf_add_mroute(struct net_device *dev)
1984 {
1985 struct fib6_config cfg = {
1986 .fc_table = RT6_TABLE_LOCAL,
1987 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1988 .fc_ifindex = dev->ifindex,
1989 .fc_dst_len = 8,
1990 .fc_flags = RTF_UP,
1991 .fc_nlinfo.nl_net = dev_net(dev),
1992 };
1993
1994 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1995
1996 ip6_route_add(&cfg);
1997 }
1998
1999 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2000 {
2001 struct inet6_dev *idev;
2002
2003 ASSERT_RTNL();
2004
2005 idev = ipv6_find_idev(dev);
2006 if (!idev)
2007 return ERR_PTR(-ENOBUFS);
2008
2009 if (idev->cnf.disable_ipv6)
2010 return ERR_PTR(-EACCES);
2011
2012 /* Add default multicast route */
2013 if (!(dev->flags & IFF_LOOPBACK))
2014 addrconf_add_mroute(dev);
2015
2016 return idev;
2017 }
2018
2019 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2020 {
2021 struct prefix_info *pinfo;
2022 __u32 valid_lft;
2023 __u32 prefered_lft;
2024 int addr_type;
2025 struct inet6_dev *in6_dev;
2026 struct net *net = dev_net(dev);
2027
2028 pinfo = (struct prefix_info *) opt;
2029
2030 if (len < sizeof(struct prefix_info)) {
2031 ADBG("addrconf: prefix option too short\n");
2032 return;
2033 }
2034
2035 /*
2036 * Validation checks ([ADDRCONF], page 19)
2037 */
2038
2039 addr_type = ipv6_addr_type(&pinfo->prefix);
2040
2041 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2042 return;
2043
2044 valid_lft = ntohl(pinfo->valid);
2045 prefered_lft = ntohl(pinfo->prefered);
2046
2047 if (prefered_lft > valid_lft) {
2048 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2049 return;
2050 }
2051
2052 in6_dev = in6_dev_get(dev);
2053
2054 if (in6_dev == NULL) {
2055 net_dbg_ratelimited("addrconf: device %s not configured\n",
2056 dev->name);
2057 return;
2058 }
2059
2060 /*
2061 * Two things going on here:
2062 * 1) Add routes for on-link prefixes
2063 * 2) Configure prefixes with the auto flag set
2064 */
2065
2066 if (pinfo->onlink) {
2067 struct rt6_info *rt;
2068 unsigned long rt_expires;
2069
2070 /* Avoid arithmetic overflow. Really, we could
2071 * save rt_expires in seconds, likely valid_lft,
2072 * but it would require division in fib gc, that it
2073 * not good.
2074 */
2075 if (HZ > USER_HZ)
2076 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2077 else
2078 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2079
2080 if (addrconf_finite_timeout(rt_expires))
2081 rt_expires *= HZ;
2082
2083 rt = addrconf_get_prefix_route(&pinfo->prefix,
2084 pinfo->prefix_len,
2085 dev,
2086 RTF_ADDRCONF | RTF_PREFIX_RT,
2087 RTF_GATEWAY | RTF_DEFAULT);
2088
2089 if (rt) {
2090 /* Autoconf prefix route */
2091 if (valid_lft == 0) {
2092 ip6_del_rt(rt);
2093 rt = NULL;
2094 } else if (addrconf_finite_timeout(rt_expires)) {
2095 /* not infinity */
2096 rt6_set_expires(rt, jiffies + rt_expires);
2097 } else {
2098 rt6_clean_expires(rt);
2099 }
2100 } else if (valid_lft) {
2101 clock_t expires = 0;
2102 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2103 if (addrconf_finite_timeout(rt_expires)) {
2104 /* not infinity */
2105 flags |= RTF_EXPIRES;
2106 expires = jiffies_to_clock_t(rt_expires);
2107 }
2108 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2109 dev, expires, flags);
2110 }
2111 ip6_rt_put(rt);
2112 }
2113
2114 /* Try to figure out our local address for this prefix */
2115
2116 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2117 struct inet6_ifaddr *ifp;
2118 struct in6_addr addr;
2119 int create = 0, update_lft = 0;
2120 bool tokenized = false;
2121
2122 if (pinfo->prefix_len == 64) {
2123 memcpy(&addr, &pinfo->prefix, 8);
2124
2125 if (!ipv6_addr_any(&in6_dev->token)) {
2126 read_lock_bh(&in6_dev->lock);
2127 memcpy(addr.s6_addr + 8,
2128 in6_dev->token.s6_addr + 8, 8);
2129 read_unlock_bh(&in6_dev->lock);
2130 tokenized = true;
2131 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2132 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2133 in6_dev_put(in6_dev);
2134 return;
2135 }
2136 goto ok;
2137 }
2138 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2139 pinfo->prefix_len);
2140 in6_dev_put(in6_dev);
2141 return;
2142
2143 ok:
2144
2145 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2146
2147 if (ifp == NULL && valid_lft) {
2148 int max_addresses = in6_dev->cnf.max_addresses;
2149 u32 addr_flags = 0;
2150
2151 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2152 if (in6_dev->cnf.optimistic_dad &&
2153 !net->ipv6.devconf_all->forwarding && sllao)
2154 addr_flags = IFA_F_OPTIMISTIC;
2155 #endif
2156
2157 /* Do not allow to create too much of autoconfigured
2158 * addresses; this would be too easy way to crash kernel.
2159 */
2160 if (!max_addresses ||
2161 ipv6_count_addresses(in6_dev) < max_addresses)
2162 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2163 pinfo->prefix_len,
2164 addr_type&IPV6_ADDR_SCOPE_MASK,
2165 addr_flags, valid_lft,
2166 prefered_lft);
2167
2168 if (IS_ERR_OR_NULL(ifp)) {
2169 in6_dev_put(in6_dev);
2170 return;
2171 }
2172
2173 update_lft = 0;
2174 create = 1;
2175 ifp->cstamp = jiffies;
2176 ifp->tokenized = tokenized;
2177 addrconf_dad_start(ifp);
2178 }
2179
2180 if (ifp) {
2181 u32 flags;
2182 unsigned long now;
2183 struct inet6_ifaddr *ift;
2184 u32 stored_lft;
2185
2186 /* update lifetime (RFC2462 5.5.3 e) */
2187 spin_lock(&ifp->lock);
2188 now = jiffies;
2189 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2190 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2191 else
2192 stored_lft = 0;
2193 if (!update_lft && !create && stored_lft) {
2194 const u32 minimum_lft = min(
2195 stored_lft, (u32)MIN_VALID_LIFETIME);
2196 valid_lft = max(valid_lft, minimum_lft);
2197
2198 /* RFC4862 Section 5.5.3e:
2199 * "Note that the preferred lifetime of the
2200 * corresponding address is always reset to
2201 * the Preferred Lifetime in the received
2202 * Prefix Information option, regardless of
2203 * whether the valid lifetime is also reset or
2204 * ignored."
2205 *
2206 * So we should always update prefered_lft here.
2207 */
2208 update_lft = 1;
2209 }
2210
2211 if (update_lft) {
2212 ifp->valid_lft = valid_lft;
2213 ifp->prefered_lft = prefered_lft;
2214 ifp->tstamp = now;
2215 flags = ifp->flags;
2216 ifp->flags &= ~IFA_F_DEPRECATED;
2217 spin_unlock(&ifp->lock);
2218
2219 if (!(flags&IFA_F_TENTATIVE))
2220 ipv6_ifa_notify(0, ifp);
2221 } else
2222 spin_unlock(&ifp->lock);
2223
2224 read_lock_bh(&in6_dev->lock);
2225 /* update all temporary addresses in the list */
2226 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2227 tmp_list) {
2228 int age, max_valid, max_prefered;
2229
2230 if (ifp != ift->ifpub)
2231 continue;
2232
2233 /*
2234 * RFC 4941 section 3.3:
2235 * If a received option will extend the lifetime
2236 * of a public address, the lifetimes of
2237 * temporary addresses should be extended,
2238 * subject to the overall constraint that no
2239 * temporary addresses should ever remain
2240 * "valid" or "preferred" for a time longer than
2241 * (TEMP_VALID_LIFETIME) or
2242 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2243 * respectively.
2244 */
2245 age = (now - ift->cstamp) / HZ;
2246 max_valid = in6_dev->cnf.temp_valid_lft - age;
2247 if (max_valid < 0)
2248 max_valid = 0;
2249
2250 max_prefered = in6_dev->cnf.temp_prefered_lft -
2251 in6_dev->cnf.max_desync_factor -
2252 age;
2253 if (max_prefered < 0)
2254 max_prefered = 0;
2255
2256 if (valid_lft > max_valid)
2257 valid_lft = max_valid;
2258
2259 if (prefered_lft > max_prefered)
2260 prefered_lft = max_prefered;
2261
2262 spin_lock(&ift->lock);
2263 flags = ift->flags;
2264 ift->valid_lft = valid_lft;
2265 ift->prefered_lft = prefered_lft;
2266 ift->tstamp = now;
2267 if (prefered_lft > 0)
2268 ift->flags &= ~IFA_F_DEPRECATED;
2269
2270 spin_unlock(&ift->lock);
2271 if (!(flags&IFA_F_TENTATIVE))
2272 ipv6_ifa_notify(0, ift);
2273 }
2274
2275 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2276 /*
2277 * When a new public address is created as
2278 * described in [ADDRCONF], also create a new
2279 * temporary address. Also create a temporary
2280 * address if it's enabled but no temporary
2281 * address currently exists.
2282 */
2283 read_unlock_bh(&in6_dev->lock);
2284 ipv6_create_tempaddr(ifp, NULL);
2285 } else {
2286 read_unlock_bh(&in6_dev->lock);
2287 }
2288
2289 in6_ifa_put(ifp);
2290 addrconf_verify(0);
2291 }
2292 }
2293 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2294 in6_dev_put(in6_dev);
2295 }
2296
2297 /*
2298 * Set destination address.
2299 * Special case for SIT interfaces where we create a new "virtual"
2300 * device.
2301 */
2302 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2303 {
2304 struct in6_ifreq ireq;
2305 struct net_device *dev;
2306 int err = -EINVAL;
2307
2308 rtnl_lock();
2309
2310 err = -EFAULT;
2311 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2312 goto err_exit;
2313
2314 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2315
2316 err = -ENODEV;
2317 if (dev == NULL)
2318 goto err_exit;
2319
2320 #if IS_ENABLED(CONFIG_IPV6_SIT)
2321 if (dev->type == ARPHRD_SIT) {
2322 const struct net_device_ops *ops = dev->netdev_ops;
2323 struct ifreq ifr;
2324 struct ip_tunnel_parm p;
2325
2326 err = -EADDRNOTAVAIL;
2327 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2328 goto err_exit;
2329
2330 memset(&p, 0, sizeof(p));
2331 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2332 p.iph.saddr = 0;
2333 p.iph.version = 4;
2334 p.iph.ihl = 5;
2335 p.iph.protocol = IPPROTO_IPV6;
2336 p.iph.ttl = 64;
2337 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2338
2339 if (ops->ndo_do_ioctl) {
2340 mm_segment_t oldfs = get_fs();
2341
2342 set_fs(KERNEL_DS);
2343 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2344 set_fs(oldfs);
2345 } else
2346 err = -EOPNOTSUPP;
2347
2348 if (err == 0) {
2349 err = -ENOBUFS;
2350 dev = __dev_get_by_name(net, p.name);
2351 if (!dev)
2352 goto err_exit;
2353 err = dev_open(dev);
2354 }
2355 }
2356 #endif
2357
2358 err_exit:
2359 rtnl_unlock();
2360 return err;
2361 }
2362
2363 /*
2364 * Manual configuration of address on an interface
2365 */
2366 static int inet6_addr_add(struct net *net, int ifindex,
2367 const struct in6_addr *pfx,
2368 const struct in6_addr *peer_pfx,
2369 unsigned int plen, __u32 ifa_flags,
2370 __u32 prefered_lft, __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, false);
2618
2619 /* Failure cases are ignored */
2620 if (!IS_ERR(sp_rt)) {
2621 sp_ifa->rt = sp_rt;
2622 ip6_ins_rt(sp_rt);
2623 }
2624 }
2625 read_unlock_bh(&idev->lock);
2626 }
2627 }
2628
2629 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2630 {
2631 struct inet6_ifaddr *ifp;
2632 u32 addr_flags = IFA_F_PERMANENT;
2633
2634 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2635 if (idev->cnf.optimistic_dad &&
2636 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2637 addr_flags |= IFA_F_OPTIMISTIC;
2638 #endif
2639
2640
2641 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0);
2642 if (!IS_ERR(ifp)) {
2643 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2644 addrconf_dad_start(ifp);
2645 in6_ifa_put(ifp);
2646 }
2647 }
2648
2649 static void addrconf_dev_config(struct net_device *dev)
2650 {
2651 struct in6_addr addr;
2652 struct inet6_dev *idev;
2653
2654 ASSERT_RTNL();
2655
2656 if ((dev->type != ARPHRD_ETHER) &&
2657 (dev->type != ARPHRD_FDDI) &&
2658 (dev->type != ARPHRD_ARCNET) &&
2659 (dev->type != ARPHRD_INFINIBAND) &&
2660 (dev->type != ARPHRD_IEEE802154) &&
2661 (dev->type != ARPHRD_IEEE1394) &&
2662 (dev->type != ARPHRD_TUNNEL6)) {
2663 /* Alas, we support only Ethernet autoconfiguration. */
2664 return;
2665 }
2666
2667 idev = addrconf_add_dev(dev);
2668 if (IS_ERR(idev))
2669 return;
2670
2671 memset(&addr, 0, sizeof(struct in6_addr));
2672 addr.s6_addr32[0] = htonl(0xFE800000);
2673
2674 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2675 addrconf_add_linklocal(idev, &addr);
2676 }
2677
2678 #if IS_ENABLED(CONFIG_IPV6_SIT)
2679 static void addrconf_sit_config(struct net_device *dev)
2680 {
2681 struct inet6_dev *idev;
2682
2683 ASSERT_RTNL();
2684
2685 /*
2686 * Configure the tunnel with one of our IPv4
2687 * addresses... we should configure all of
2688 * our v4 addrs in the tunnel
2689 */
2690
2691 if ((idev = ipv6_find_idev(dev)) == NULL) {
2692 pr_debug("%s: add_dev failed\n", __func__);
2693 return;
2694 }
2695
2696 if (dev->priv_flags & IFF_ISATAP) {
2697 struct in6_addr addr;
2698
2699 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2700 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2701 addrconf_add_linklocal(idev, &addr);
2702 return;
2703 }
2704
2705 sit_add_v4_addrs(idev);
2706
2707 if (dev->flags&IFF_POINTOPOINT)
2708 addrconf_add_mroute(dev);
2709 }
2710 #endif
2711
2712 #if IS_ENABLED(CONFIG_NET_IPGRE)
2713 static void addrconf_gre_config(struct net_device *dev)
2714 {
2715 struct inet6_dev *idev;
2716 struct in6_addr addr;
2717
2718 ASSERT_RTNL();
2719
2720 if ((idev = ipv6_find_idev(dev)) == NULL) {
2721 pr_debug("%s: add_dev failed\n", __func__);
2722 return;
2723 }
2724
2725 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2726 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2727 addrconf_add_linklocal(idev, &addr);
2728 }
2729 #endif
2730
2731 static inline int
2732 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2733 {
2734 struct in6_addr lladdr;
2735
2736 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2737 addrconf_add_linklocal(idev, &lladdr);
2738 return 0;
2739 }
2740 return -1;
2741 }
2742
2743 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2744 void *ptr)
2745 {
2746 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2747 struct inet6_dev *idev = __in6_dev_get(dev);
2748 int run_pending = 0;
2749 int err;
2750
2751 switch (event) {
2752 case NETDEV_REGISTER:
2753 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2754 idev = ipv6_add_dev(dev);
2755 if (!idev)
2756 return notifier_from_errno(-ENOMEM);
2757 }
2758 break;
2759
2760 case NETDEV_UP:
2761 case NETDEV_CHANGE:
2762 if (dev->flags & IFF_SLAVE)
2763 break;
2764
2765 if (event == NETDEV_UP) {
2766 if (!addrconf_qdisc_ok(dev)) {
2767 /* device is not ready yet. */
2768 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2769 dev->name);
2770 break;
2771 }
2772
2773 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2774 idev = ipv6_add_dev(dev);
2775
2776 if (idev) {
2777 idev->if_flags |= IF_READY;
2778 run_pending = 1;
2779 }
2780 } else {
2781 if (!addrconf_qdisc_ok(dev)) {
2782 /* device is still not ready. */
2783 break;
2784 }
2785
2786 if (idev) {
2787 if (idev->if_flags & IF_READY)
2788 /* device is already configured. */
2789 break;
2790 idev->if_flags |= IF_READY;
2791 }
2792
2793 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2794 dev->name);
2795
2796 run_pending = 1;
2797 }
2798
2799 switch (dev->type) {
2800 #if IS_ENABLED(CONFIG_IPV6_SIT)
2801 case ARPHRD_SIT:
2802 addrconf_sit_config(dev);
2803 break;
2804 #endif
2805 #if IS_ENABLED(CONFIG_NET_IPGRE)
2806 case ARPHRD_IPGRE:
2807 addrconf_gre_config(dev);
2808 break;
2809 #endif
2810 case ARPHRD_LOOPBACK:
2811 init_loopback(dev);
2812 break;
2813
2814 default:
2815 addrconf_dev_config(dev);
2816 break;
2817 }
2818
2819 if (idev) {
2820 if (run_pending)
2821 addrconf_dad_run(idev);
2822
2823 /*
2824 * If the MTU changed during the interface down,
2825 * when the interface up, the changed MTU must be
2826 * reflected in the idev as well as routers.
2827 */
2828 if (idev->cnf.mtu6 != dev->mtu &&
2829 dev->mtu >= IPV6_MIN_MTU) {
2830 rt6_mtu_change(dev, dev->mtu);
2831 idev->cnf.mtu6 = dev->mtu;
2832 }
2833 idev->tstamp = jiffies;
2834 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2835
2836 /*
2837 * If the changed mtu during down is lower than
2838 * IPV6_MIN_MTU stop IPv6 on this interface.
2839 */
2840 if (dev->mtu < IPV6_MIN_MTU)
2841 addrconf_ifdown(dev, 1);
2842 }
2843 break;
2844
2845 case NETDEV_CHANGEMTU:
2846 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2847 rt6_mtu_change(dev, dev->mtu);
2848 idev->cnf.mtu6 = dev->mtu;
2849 break;
2850 }
2851
2852 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2853 idev = ipv6_add_dev(dev);
2854 if (idev)
2855 break;
2856 }
2857
2858 /*
2859 * MTU falled under IPV6_MIN_MTU.
2860 * Stop IPv6 on this interface.
2861 */
2862
2863 case NETDEV_DOWN:
2864 case NETDEV_UNREGISTER:
2865 /*
2866 * Remove all addresses from this interface.
2867 */
2868 addrconf_ifdown(dev, event != NETDEV_DOWN);
2869 break;
2870
2871 case NETDEV_CHANGENAME:
2872 if (idev) {
2873 snmp6_unregister_dev(idev);
2874 addrconf_sysctl_unregister(idev);
2875 addrconf_sysctl_register(idev);
2876 err = snmp6_register_dev(idev);
2877 if (err)
2878 return notifier_from_errno(err);
2879 }
2880 break;
2881
2882 case NETDEV_PRE_TYPE_CHANGE:
2883 case NETDEV_POST_TYPE_CHANGE:
2884 addrconf_type_change(dev, event);
2885 break;
2886 }
2887
2888 return NOTIFY_OK;
2889 }
2890
2891 /*
2892 * addrconf module should be notified of a device going up
2893 */
2894 static struct notifier_block ipv6_dev_notf = {
2895 .notifier_call = addrconf_notify,
2896 };
2897
2898 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2899 {
2900 struct inet6_dev *idev;
2901 ASSERT_RTNL();
2902
2903 idev = __in6_dev_get(dev);
2904
2905 if (event == NETDEV_POST_TYPE_CHANGE)
2906 ipv6_mc_remap(idev);
2907 else if (event == NETDEV_PRE_TYPE_CHANGE)
2908 ipv6_mc_unmap(idev);
2909 }
2910
2911 static int addrconf_ifdown(struct net_device *dev, int how)
2912 {
2913 struct net *net = dev_net(dev);
2914 struct inet6_dev *idev;
2915 struct inet6_ifaddr *ifa;
2916 int state, i;
2917
2918 ASSERT_RTNL();
2919
2920 rt6_ifdown(net, dev);
2921 neigh_ifdown(&nd_tbl, dev);
2922
2923 idev = __in6_dev_get(dev);
2924 if (idev == NULL)
2925 return -ENODEV;
2926
2927 /*
2928 * Step 1: remove reference to ipv6 device from parent device.
2929 * Do not dev_put!
2930 */
2931 if (how) {
2932 idev->dead = 1;
2933
2934 /* protected by rtnl_lock */
2935 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2936
2937 /* Step 1.5: remove snmp6 entry */
2938 snmp6_unregister_dev(idev);
2939
2940 }
2941
2942 /* Step 2: clear hash table */
2943 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2944 struct hlist_head *h = &inet6_addr_lst[i];
2945
2946 spin_lock_bh(&addrconf_hash_lock);
2947 restart:
2948 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
2949 if (ifa->idev == idev) {
2950 hlist_del_init_rcu(&ifa->addr_lst);
2951 addrconf_del_dad_timer(ifa);
2952 goto restart;
2953 }
2954 }
2955 spin_unlock_bh(&addrconf_hash_lock);
2956 }
2957
2958 write_lock_bh(&idev->lock);
2959
2960 addrconf_del_rs_timer(idev);
2961
2962 /* Step 2: clear flags for stateless addrconf */
2963 if (!how)
2964 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2965
2966 if (how && del_timer(&idev->regen_timer))
2967 in6_dev_put(idev);
2968
2969 /* Step 3: clear tempaddr list */
2970 while (!list_empty(&idev->tempaddr_list)) {
2971 ifa = list_first_entry(&idev->tempaddr_list,
2972 struct inet6_ifaddr, tmp_list);
2973 list_del(&ifa->tmp_list);
2974 write_unlock_bh(&idev->lock);
2975 spin_lock_bh(&ifa->lock);
2976
2977 if (ifa->ifpub) {
2978 in6_ifa_put(ifa->ifpub);
2979 ifa->ifpub = NULL;
2980 }
2981 spin_unlock_bh(&ifa->lock);
2982 in6_ifa_put(ifa);
2983 write_lock_bh(&idev->lock);
2984 }
2985
2986 while (!list_empty(&idev->addr_list)) {
2987 ifa = list_first_entry(&idev->addr_list,
2988 struct inet6_ifaddr, if_list);
2989 addrconf_del_dad_timer(ifa);
2990
2991 list_del(&ifa->if_list);
2992
2993 write_unlock_bh(&idev->lock);
2994
2995 spin_lock_bh(&ifa->state_lock);
2996 state = ifa->state;
2997 ifa->state = INET6_IFADDR_STATE_DEAD;
2998 spin_unlock_bh(&ifa->state_lock);
2999
3000 if (state != INET6_IFADDR_STATE_DEAD) {
3001 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3002 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3003 }
3004 in6_ifa_put(ifa);
3005
3006 write_lock_bh(&idev->lock);
3007 }
3008
3009 write_unlock_bh(&idev->lock);
3010
3011 /* Step 5: Discard multicast list */
3012 if (how)
3013 ipv6_mc_destroy_dev(idev);
3014 else
3015 ipv6_mc_down(idev);
3016
3017 idev->tstamp = jiffies;
3018
3019 /* Last: Shot the device (if unregistered) */
3020 if (how) {
3021 addrconf_sysctl_unregister(idev);
3022 neigh_parms_release(&nd_tbl, idev->nd_parms);
3023 neigh_ifdown(&nd_tbl, dev);
3024 in6_dev_put(idev);
3025 }
3026 return 0;
3027 }
3028
3029 static void addrconf_rs_timer(unsigned long data)
3030 {
3031 struct inet6_dev *idev = (struct inet6_dev *)data;
3032 struct net_device *dev = idev->dev;
3033 struct in6_addr lladdr;
3034
3035 write_lock(&idev->lock);
3036 if (idev->dead || !(idev->if_flags & IF_READY))
3037 goto out;
3038
3039 if (!ipv6_accept_ra(idev))
3040 goto out;
3041
3042 /* Announcement received after solicitation was sent */
3043 if (idev->if_flags & IF_RA_RCVD)
3044 goto out;
3045
3046 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3047 write_unlock(&idev->lock);
3048 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3049 ndisc_send_rs(dev, &lladdr,
3050 &in6addr_linklocal_allrouters);
3051 else
3052 goto put;
3053
3054 write_lock(&idev->lock);
3055 /* The wait after the last probe can be shorter */
3056 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3057 idev->cnf.rtr_solicits) ?
3058 idev->cnf.rtr_solicit_delay :
3059 idev->cnf.rtr_solicit_interval);
3060 } else {
3061 /*
3062 * Note: we do not support deprecated "all on-link"
3063 * assumption any longer.
3064 */
3065 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3066 }
3067
3068 out:
3069 write_unlock(&idev->lock);
3070 put:
3071 in6_dev_put(idev);
3072 }
3073
3074 /*
3075 * Duplicate Address Detection
3076 */
3077 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3078 {
3079 unsigned long rand_num;
3080 struct inet6_dev *idev = ifp->idev;
3081
3082 if (ifp->flags & IFA_F_OPTIMISTIC)
3083 rand_num = 0;
3084 else
3085 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3086
3087 ifp->dad_probes = idev->cnf.dad_transmits;
3088 addrconf_mod_dad_timer(ifp, rand_num);
3089 }
3090
3091 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3092 {
3093 struct inet6_dev *idev = ifp->idev;
3094 struct net_device *dev = idev->dev;
3095
3096 addrconf_join_solict(dev, &ifp->addr);
3097
3098 net_srandom(ifp->addr.s6_addr32[3]);
3099
3100 read_lock_bh(&idev->lock);
3101 spin_lock(&ifp->lock);
3102 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3103 goto out;
3104
3105 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3106 idev->cnf.accept_dad < 1 ||
3107 !(ifp->flags&IFA_F_TENTATIVE) ||
3108 ifp->flags & IFA_F_NODAD) {
3109 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3110 spin_unlock(&ifp->lock);
3111 read_unlock_bh(&idev->lock);
3112
3113 addrconf_dad_completed(ifp);
3114 return;
3115 }
3116
3117 if (!(idev->if_flags & IF_READY)) {
3118 spin_unlock(&ifp->lock);
3119 read_unlock_bh(&idev->lock);
3120 /*
3121 * If the device is not ready:
3122 * - keep it tentative if it is a permanent address.
3123 * - otherwise, kill it.
3124 */
3125 in6_ifa_hold(ifp);
3126 addrconf_dad_stop(ifp, 0);
3127 return;
3128 }
3129
3130 /*
3131 * Optimistic nodes can start receiving
3132 * Frames right away
3133 */
3134 if (ifp->flags & IFA_F_OPTIMISTIC)
3135 ip6_ins_rt(ifp->rt);
3136
3137 addrconf_dad_kick(ifp);
3138 out:
3139 spin_unlock(&ifp->lock);
3140 read_unlock_bh(&idev->lock);
3141 }
3142
3143 static void addrconf_dad_timer(unsigned long data)
3144 {
3145 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3146 struct inet6_dev *idev = ifp->idev;
3147 struct in6_addr mcaddr;
3148
3149 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3150 goto out;
3151
3152 write_lock(&idev->lock);
3153 if (idev->dead || !(idev->if_flags & IF_READY)) {
3154 write_unlock(&idev->lock);
3155 goto out;
3156 }
3157
3158 spin_lock(&ifp->lock);
3159 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3160 spin_unlock(&ifp->lock);
3161 write_unlock(&idev->lock);
3162 goto out;
3163 }
3164
3165 if (ifp->dad_probes == 0) {
3166 /*
3167 * DAD was successful
3168 */
3169
3170 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3171 spin_unlock(&ifp->lock);
3172 write_unlock(&idev->lock);
3173
3174 addrconf_dad_completed(ifp);
3175
3176 goto out;
3177 }
3178
3179 ifp->dad_probes--;
3180 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
3181 spin_unlock(&ifp->lock);
3182 write_unlock(&idev->lock);
3183
3184 /* send a neighbour solicitation for our addr */
3185 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3186 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3187 out:
3188 in6_ifa_put(ifp);
3189 }
3190
3191 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3192 {
3193 struct net_device *dev = ifp->idev->dev;
3194 struct in6_addr lladdr;
3195 bool send_rs, send_mld;
3196
3197 addrconf_del_dad_timer(ifp);
3198
3199 /*
3200 * Configure the address for reception. Now it is valid.
3201 */
3202
3203 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3204
3205 /* If added prefix is link local and we are prepared to process
3206 router advertisements, start sending router solicitations.
3207 */
3208
3209 read_lock_bh(&ifp->idev->lock);
3210 spin_lock(&ifp->lock);
3211 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3212 ifp->idev->valid_ll_addr_cnt == 1;
3213 send_rs = send_mld &&
3214 ipv6_accept_ra(ifp->idev) &&
3215 ifp->idev->cnf.rtr_solicits > 0 &&
3216 (dev->flags&IFF_LOOPBACK) == 0;
3217 spin_unlock(&ifp->lock);
3218 read_unlock_bh(&ifp->idev->lock);
3219
3220 /* While dad is in progress mld report's source address is in6_addrany.
3221 * Resend with proper ll now.
3222 */
3223 if (send_mld)
3224 ipv6_mc_dad_complete(ifp->idev);
3225
3226 if (send_rs) {
3227 /*
3228 * If a host as already performed a random delay
3229 * [...] as part of DAD [...] there is no need
3230 * to delay again before sending the first RS
3231 */
3232 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3233 return;
3234 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3235
3236 write_lock_bh(&ifp->idev->lock);
3237 spin_lock(&ifp->lock);
3238 ifp->idev->rs_probes = 1;
3239 ifp->idev->if_flags |= IF_RS_SENT;
3240 addrconf_mod_rs_timer(ifp->idev,
3241 ifp->idev->cnf.rtr_solicit_interval);
3242 spin_unlock(&ifp->lock);
3243 write_unlock_bh(&ifp->idev->lock);
3244 }
3245 }
3246
3247 static void addrconf_dad_run(struct inet6_dev *idev)
3248 {
3249 struct inet6_ifaddr *ifp;
3250
3251 read_lock_bh(&idev->lock);
3252 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3253 spin_lock(&ifp->lock);
3254 if (ifp->flags & IFA_F_TENTATIVE &&
3255 ifp->state == INET6_IFADDR_STATE_DAD)
3256 addrconf_dad_kick(ifp);
3257 spin_unlock(&ifp->lock);
3258 }
3259 read_unlock_bh(&idev->lock);
3260 }
3261
3262 #ifdef CONFIG_PROC_FS
3263 struct if6_iter_state {
3264 struct seq_net_private p;
3265 int bucket;
3266 int offset;
3267 };
3268
3269 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3270 {
3271 struct inet6_ifaddr *ifa = NULL;
3272 struct if6_iter_state *state = seq->private;
3273 struct net *net = seq_file_net(seq);
3274 int p = 0;
3275
3276 /* initial bucket if pos is 0 */
3277 if (pos == 0) {
3278 state->bucket = 0;
3279 state->offset = 0;
3280 }
3281
3282 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3283 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3284 addr_lst) {
3285 if (!net_eq(dev_net(ifa->idev->dev), net))
3286 continue;
3287 /* sync with offset */
3288 if (p < state->offset) {
3289 p++;
3290 continue;
3291 }
3292 state->offset++;
3293 return ifa;
3294 }
3295
3296 /* prepare for next bucket */
3297 state->offset = 0;
3298 p = 0;
3299 }
3300 return NULL;
3301 }
3302
3303 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3304 struct inet6_ifaddr *ifa)
3305 {
3306 struct if6_iter_state *state = seq->private;
3307 struct net *net = seq_file_net(seq);
3308
3309 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3310 if (!net_eq(dev_net(ifa->idev->dev), net))
3311 continue;
3312 state->offset++;
3313 return ifa;
3314 }
3315
3316 while (++state->bucket < IN6_ADDR_HSIZE) {
3317 state->offset = 0;
3318 hlist_for_each_entry_rcu_bh(ifa,
3319 &inet6_addr_lst[state->bucket], addr_lst) {
3320 if (!net_eq(dev_net(ifa->idev->dev), net))
3321 continue;
3322 state->offset++;
3323 return ifa;
3324 }
3325 }
3326
3327 return NULL;
3328 }
3329
3330 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3331 __acquires(rcu_bh)
3332 {
3333 rcu_read_lock_bh();
3334 return if6_get_first(seq, *pos);
3335 }
3336
3337 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3338 {
3339 struct inet6_ifaddr *ifa;
3340
3341 ifa = if6_get_next(seq, v);
3342 ++*pos;
3343 return ifa;
3344 }
3345
3346 static void if6_seq_stop(struct seq_file *seq, void *v)
3347 __releases(rcu_bh)
3348 {
3349 rcu_read_unlock_bh();
3350 }
3351
3352 static int if6_seq_show(struct seq_file *seq, void *v)
3353 {
3354 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3355 seq_printf(seq, "%pi6 %02x %02x %02x %03x %8s\n",
3356 &ifp->addr,
3357 ifp->idev->dev->ifindex,
3358 ifp->prefix_len,
3359 ifp->scope,
3360 ifp->flags,
3361 ifp->idev->dev->name);
3362 return 0;
3363 }
3364
3365 static const struct seq_operations if6_seq_ops = {
3366 .start = if6_seq_start,
3367 .next = if6_seq_next,
3368 .show = if6_seq_show,
3369 .stop = if6_seq_stop,
3370 };
3371
3372 static int if6_seq_open(struct inode *inode, struct file *file)
3373 {
3374 return seq_open_net(inode, file, &if6_seq_ops,
3375 sizeof(struct if6_iter_state));
3376 }
3377
3378 static const struct file_operations if6_fops = {
3379 .owner = THIS_MODULE,
3380 .open = if6_seq_open,
3381 .read = seq_read,
3382 .llseek = seq_lseek,
3383 .release = seq_release_net,
3384 };
3385
3386 static int __net_init if6_proc_net_init(struct net *net)
3387 {
3388 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3389 return -ENOMEM;
3390 return 0;
3391 }
3392
3393 static void __net_exit if6_proc_net_exit(struct net *net)
3394 {
3395 remove_proc_entry("if_inet6", net->proc_net);
3396 }
3397
3398 static struct pernet_operations if6_proc_net_ops = {
3399 .init = if6_proc_net_init,
3400 .exit = if6_proc_net_exit,
3401 };
3402
3403 int __init if6_proc_init(void)
3404 {
3405 return register_pernet_subsys(&if6_proc_net_ops);
3406 }
3407
3408 void if6_proc_exit(void)
3409 {
3410 unregister_pernet_subsys(&if6_proc_net_ops);
3411 }
3412 #endif /* CONFIG_PROC_FS */
3413
3414 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3415 /* Check if address is a home address configured on any interface. */
3416 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3417 {
3418 int ret = 0;
3419 struct inet6_ifaddr *ifp = NULL;
3420 unsigned int hash = inet6_addr_hash(addr);
3421
3422 rcu_read_lock_bh();
3423 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3424 if (!net_eq(dev_net(ifp->idev->dev), net))
3425 continue;
3426 if (ipv6_addr_equal(&ifp->addr, addr) &&
3427 (ifp->flags & IFA_F_HOMEADDRESS)) {
3428 ret = 1;
3429 break;
3430 }
3431 }
3432 rcu_read_unlock_bh();
3433 return ret;
3434 }
3435 #endif
3436
3437 /*
3438 * Periodic address status verification
3439 */
3440
3441 static void addrconf_verify(unsigned long foo)
3442 {
3443 unsigned long now, next, next_sec, next_sched;
3444 struct inet6_ifaddr *ifp;
3445 int i;
3446
3447 rcu_read_lock_bh();
3448 spin_lock(&addrconf_verify_lock);
3449 now = jiffies;
3450 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3451
3452 del_timer(&addr_chk_timer);
3453
3454 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3455 restart:
3456 hlist_for_each_entry_rcu_bh(ifp,
3457 &inet6_addr_lst[i], addr_lst) {
3458 unsigned long age;
3459
3460 if (ifp->flags & IFA_F_PERMANENT)
3461 continue;
3462
3463 spin_lock(&ifp->lock);
3464 /* We try to batch several events at once. */
3465 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3466
3467 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3468 age >= ifp->valid_lft) {
3469 spin_unlock(&ifp->lock);
3470 in6_ifa_hold(ifp);
3471 ipv6_del_addr(ifp);
3472 goto restart;
3473 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3474 spin_unlock(&ifp->lock);
3475 continue;
3476 } else if (age >= ifp->prefered_lft) {
3477 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3478 int deprecate = 0;
3479
3480 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3481 deprecate = 1;
3482 ifp->flags |= IFA_F_DEPRECATED;
3483 }
3484
3485 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3486 next = ifp->tstamp + ifp->valid_lft * HZ;
3487
3488 spin_unlock(&ifp->lock);
3489
3490 if (deprecate) {
3491 in6_ifa_hold(ifp);
3492
3493 ipv6_ifa_notify(0, ifp);
3494 in6_ifa_put(ifp);
3495 goto restart;
3496 }
3497 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3498 !(ifp->flags&IFA_F_TENTATIVE)) {
3499 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3500 ifp->idev->cnf.dad_transmits *
3501 ifp->idev->nd_parms->retrans_time / HZ;
3502
3503 if (age >= ifp->prefered_lft - regen_advance) {
3504 struct inet6_ifaddr *ifpub = ifp->ifpub;
3505 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3506 next = ifp->tstamp + ifp->prefered_lft * HZ;
3507 if (!ifp->regen_count && ifpub) {
3508 ifp->regen_count++;
3509 in6_ifa_hold(ifp);
3510 in6_ifa_hold(ifpub);
3511 spin_unlock(&ifp->lock);
3512
3513 spin_lock(&ifpub->lock);
3514 ifpub->regen_count = 0;
3515 spin_unlock(&ifpub->lock);
3516 ipv6_create_tempaddr(ifpub, ifp);
3517 in6_ifa_put(ifpub);
3518 in6_ifa_put(ifp);
3519 goto restart;
3520 }
3521 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3522 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3523 spin_unlock(&ifp->lock);
3524 } else {
3525 /* ifp->prefered_lft <= ifp->valid_lft */
3526 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3527 next = ifp->tstamp + ifp->prefered_lft * HZ;
3528 spin_unlock(&ifp->lock);
3529 }
3530 }
3531 }
3532
3533 next_sec = round_jiffies_up(next);
3534 next_sched = next;
3535
3536 /* If rounded timeout is accurate enough, accept it. */
3537 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3538 next_sched = next_sec;
3539
3540 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3541 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3542 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3543
3544 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3545 now, next, next_sec, next_sched);
3546
3547 addr_chk_timer.expires = next_sched;
3548 add_timer(&addr_chk_timer);
3549 spin_unlock(&addrconf_verify_lock);
3550 rcu_read_unlock_bh();
3551 }
3552
3553 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3554 struct in6_addr **peer_pfx)
3555 {
3556 struct in6_addr *pfx = NULL;
3557
3558 *peer_pfx = NULL;
3559
3560 if (addr)
3561 pfx = nla_data(addr);
3562
3563 if (local) {
3564 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3565 *peer_pfx = pfx;
3566 pfx = nla_data(local);
3567 }
3568
3569 return pfx;
3570 }
3571
3572 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3573 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3574 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3575 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3576 [IFA_FLAGS] = { .len = sizeof(u32) },
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, u32 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 u32 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 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3683
3684 /* We ignore other flags so far. */
3685 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS;
3686
3687 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3688 if (ifa == NULL) {
3689 /*
3690 * It would be best to check for !NLM_F_CREATE here but
3691 * userspace alreay relies on not having to provide this.
3692 */
3693 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3694 ifm->ifa_prefixlen, ifa_flags,
3695 preferred_lft, valid_lft);
3696 }
3697
3698 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3699 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3700 err = -EEXIST;
3701 else
3702 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3703
3704 in6_ifa_put(ifa);
3705
3706 return err;
3707 }
3708
3709 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
3710 u8 scope, int ifindex)
3711 {
3712 struct ifaddrmsg *ifm;
3713
3714 ifm = nlmsg_data(nlh);
3715 ifm->ifa_family = AF_INET6;
3716 ifm->ifa_prefixlen = prefixlen;
3717 ifm->ifa_flags = flags;
3718 ifm->ifa_scope = scope;
3719 ifm->ifa_index = ifindex;
3720 }
3721
3722 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3723 unsigned long tstamp, u32 preferred, u32 valid)
3724 {
3725 struct ifa_cacheinfo ci;
3726
3727 ci.cstamp = cstamp_delta(cstamp);
3728 ci.tstamp = cstamp_delta(tstamp);
3729 ci.ifa_prefered = preferred;
3730 ci.ifa_valid = valid;
3731
3732 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3733 }
3734
3735 static inline int rt_scope(int ifa_scope)
3736 {
3737 if (ifa_scope & IFA_HOST)
3738 return RT_SCOPE_HOST;
3739 else if (ifa_scope & IFA_LINK)
3740 return RT_SCOPE_LINK;
3741 else if (ifa_scope & IFA_SITE)
3742 return RT_SCOPE_SITE;
3743 else
3744 return RT_SCOPE_UNIVERSE;
3745 }
3746
3747 static inline int inet6_ifaddr_msgsize(void)
3748 {
3749 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3750 + nla_total_size(16) /* IFA_LOCAL */
3751 + nla_total_size(16) /* IFA_ADDRESS */
3752 + nla_total_size(sizeof(struct ifa_cacheinfo))
3753 + nla_total_size(4) /* IFA_FLAGS */;
3754 }
3755
3756 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3757 u32 portid, u32 seq, int event, unsigned int flags)
3758 {
3759 struct nlmsghdr *nlh;
3760 u32 preferred, valid;
3761
3762 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3763 if (nlh == NULL)
3764 return -EMSGSIZE;
3765
3766 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3767 ifa->idev->dev->ifindex);
3768
3769 if (!(ifa->flags&IFA_F_PERMANENT)) {
3770 preferred = ifa->prefered_lft;
3771 valid = ifa->valid_lft;
3772 if (preferred != INFINITY_LIFE_TIME) {
3773 long tval = (jiffies - ifa->tstamp)/HZ;
3774 if (preferred > tval)
3775 preferred -= tval;
3776 else
3777 preferred = 0;
3778 if (valid != INFINITY_LIFE_TIME) {
3779 if (valid > tval)
3780 valid -= tval;
3781 else
3782 valid = 0;
3783 }
3784 }
3785 } else {
3786 preferred = INFINITY_LIFE_TIME;
3787 valid = INFINITY_LIFE_TIME;
3788 }
3789
3790 if (!ipv6_addr_any(&ifa->peer_addr)) {
3791 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3792 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3793 goto error;
3794 } else
3795 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3796 goto error;
3797
3798 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3799 goto error;
3800
3801 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
3802 goto error;
3803
3804 return nlmsg_end(skb, nlh);
3805
3806 error:
3807 nlmsg_cancel(skb, nlh);
3808 return -EMSGSIZE;
3809 }
3810
3811 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3812 u32 portid, u32 seq, int event, u16 flags)
3813 {
3814 struct nlmsghdr *nlh;
3815 u8 scope = RT_SCOPE_UNIVERSE;
3816 int ifindex = ifmca->idev->dev->ifindex;
3817
3818 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3819 scope = RT_SCOPE_SITE;
3820
3821 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3822 if (nlh == NULL)
3823 return -EMSGSIZE;
3824
3825 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3826 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3827 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3828 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3829 nlmsg_cancel(skb, nlh);
3830 return -EMSGSIZE;
3831 }
3832
3833 return nlmsg_end(skb, nlh);
3834 }
3835
3836 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3837 u32 portid, u32 seq, int event, unsigned int flags)
3838 {
3839 struct nlmsghdr *nlh;
3840 u8 scope = RT_SCOPE_UNIVERSE;
3841 int ifindex = ifaca->aca_idev->dev->ifindex;
3842
3843 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3844 scope = RT_SCOPE_SITE;
3845
3846 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3847 if (nlh == NULL)
3848 return -EMSGSIZE;
3849
3850 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3851 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3852 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3853 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3854 nlmsg_cancel(skb, nlh);
3855 return -EMSGSIZE;
3856 }
3857
3858 return nlmsg_end(skb, nlh);
3859 }
3860
3861 enum addr_type_t {
3862 UNICAST_ADDR,
3863 MULTICAST_ADDR,
3864 ANYCAST_ADDR,
3865 };
3866
3867 /* called with rcu_read_lock() */
3868 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3869 struct netlink_callback *cb, enum addr_type_t type,
3870 int s_ip_idx, int *p_ip_idx)
3871 {
3872 struct ifmcaddr6 *ifmca;
3873 struct ifacaddr6 *ifaca;
3874 int err = 1;
3875 int ip_idx = *p_ip_idx;
3876
3877 read_lock_bh(&idev->lock);
3878 switch (type) {
3879 case UNICAST_ADDR: {
3880 struct inet6_ifaddr *ifa;
3881
3882 /* unicast address incl. temp addr */
3883 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3884 if (++ip_idx < s_ip_idx)
3885 continue;
3886 err = inet6_fill_ifaddr(skb, ifa,
3887 NETLINK_CB(cb->skb).portid,
3888 cb->nlh->nlmsg_seq,
3889 RTM_NEWADDR,
3890 NLM_F_MULTI);
3891 if (err <= 0)
3892 break;
3893 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3894 }
3895 break;
3896 }
3897 case MULTICAST_ADDR:
3898 /* multicast address */
3899 for (ifmca = idev->mc_list; ifmca;
3900 ifmca = ifmca->next, ip_idx++) {
3901 if (ip_idx < s_ip_idx)
3902 continue;
3903 err = inet6_fill_ifmcaddr(skb, ifmca,
3904 NETLINK_CB(cb->skb).portid,
3905 cb->nlh->nlmsg_seq,
3906 RTM_GETMULTICAST,
3907 NLM_F_MULTI);
3908 if (err <= 0)
3909 break;
3910 }
3911 break;
3912 case ANYCAST_ADDR:
3913 /* anycast address */
3914 for (ifaca = idev->ac_list; ifaca;
3915 ifaca = ifaca->aca_next, ip_idx++) {
3916 if (ip_idx < s_ip_idx)
3917 continue;
3918 err = inet6_fill_ifacaddr(skb, ifaca,
3919 NETLINK_CB(cb->skb).portid,
3920 cb->nlh->nlmsg_seq,
3921 RTM_GETANYCAST,
3922 NLM_F_MULTI);
3923 if (err <= 0)
3924 break;
3925 }
3926 break;
3927 default:
3928 break;
3929 }
3930 read_unlock_bh(&idev->lock);
3931 *p_ip_idx = ip_idx;
3932 return err;
3933 }
3934
3935 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3936 enum addr_type_t type)
3937 {
3938 struct net *net = sock_net(skb->sk);
3939 int h, s_h;
3940 int idx, ip_idx;
3941 int s_idx, s_ip_idx;
3942 struct net_device *dev;
3943 struct inet6_dev *idev;
3944 struct hlist_head *head;
3945
3946 s_h = cb->args[0];
3947 s_idx = idx = cb->args[1];
3948 s_ip_idx = ip_idx = cb->args[2];
3949
3950 rcu_read_lock();
3951 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
3952 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3953 idx = 0;
3954 head = &net->dev_index_head[h];
3955 hlist_for_each_entry_rcu(dev, head, index_hlist) {
3956 if (idx < s_idx)
3957 goto cont;
3958 if (h > s_h || idx > s_idx)
3959 s_ip_idx = 0;
3960 ip_idx = 0;
3961 idev = __in6_dev_get(dev);
3962 if (!idev)
3963 goto cont;
3964
3965 if (in6_dump_addrs(idev, skb, cb, type,
3966 s_ip_idx, &ip_idx) <= 0)
3967 goto done;
3968 cont:
3969 idx++;
3970 }
3971 }
3972 done:
3973 rcu_read_unlock();
3974 cb->args[0] = h;
3975 cb->args[1] = idx;
3976 cb->args[2] = ip_idx;
3977
3978 return skb->len;
3979 }
3980
3981 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3982 {
3983 enum addr_type_t type = UNICAST_ADDR;
3984
3985 return inet6_dump_addr(skb, cb, type);
3986 }
3987
3988 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3989 {
3990 enum addr_type_t type = MULTICAST_ADDR;
3991
3992 return inet6_dump_addr(skb, cb, type);
3993 }
3994
3995
3996 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3997 {
3998 enum addr_type_t type = ANYCAST_ADDR;
3999
4000 return inet6_dump_addr(skb, cb, type);
4001 }
4002
4003 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4004 {
4005 struct net *net = sock_net(in_skb->sk);
4006 struct ifaddrmsg *ifm;
4007 struct nlattr *tb[IFA_MAX+1];
4008 struct in6_addr *addr = NULL, *peer;
4009 struct net_device *dev = NULL;
4010 struct inet6_ifaddr *ifa;
4011 struct sk_buff *skb;
4012 int err;
4013
4014 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4015 if (err < 0)
4016 goto errout;
4017
4018 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4019 if (addr == NULL) {
4020 err = -EINVAL;
4021 goto errout;
4022 }
4023
4024 ifm = nlmsg_data(nlh);
4025 if (ifm->ifa_index)
4026 dev = __dev_get_by_index(net, ifm->ifa_index);
4027
4028 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4029 if (!ifa) {
4030 err = -EADDRNOTAVAIL;
4031 goto errout;
4032 }
4033
4034 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4035 if (!skb) {
4036 err = -ENOBUFS;
4037 goto errout_ifa;
4038 }
4039
4040 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4041 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4042 if (err < 0) {
4043 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4044 WARN_ON(err == -EMSGSIZE);
4045 kfree_skb(skb);
4046 goto errout_ifa;
4047 }
4048 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4049 errout_ifa:
4050 in6_ifa_put(ifa);
4051 errout:
4052 return err;
4053 }
4054
4055 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4056 {
4057 struct sk_buff *skb;
4058 struct net *net = dev_net(ifa->idev->dev);
4059 int err = -ENOBUFS;
4060
4061 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4062 if (skb == NULL)
4063 goto errout;
4064
4065 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4066 if (err < 0) {
4067 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4068 WARN_ON(err == -EMSGSIZE);
4069 kfree_skb(skb);
4070 goto errout;
4071 }
4072 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4073 return;
4074 errout:
4075 if (err < 0)
4076 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4077 }
4078
4079 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4080 __s32 *array, int bytes)
4081 {
4082 BUG_ON(bytes < (DEVCONF_MAX * 4));
4083
4084 memset(array, 0, bytes);
4085 array[DEVCONF_FORWARDING] = cnf->forwarding;
4086 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4087 array[DEVCONF_MTU6] = cnf->mtu6;
4088 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4089 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4090 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4091 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4092 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4093 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4094 jiffies_to_msecs(cnf->rtr_solicit_interval);
4095 array[DEVCONF_RTR_SOLICIT_DELAY] =
4096 jiffies_to_msecs(cnf->rtr_solicit_delay);
4097 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4098 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4099 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4100 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4101 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4102 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4103 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4104 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4105 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4106 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4107 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4108 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4109 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4110 #ifdef CONFIG_IPV6_ROUTER_PREF
4111 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4112 array[DEVCONF_RTR_PROBE_INTERVAL] =
4113 jiffies_to_msecs(cnf->rtr_probe_interval);
4114 #ifdef CONFIG_IPV6_ROUTE_INFO
4115 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4116 #endif
4117 #endif
4118 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4119 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4120 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4121 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4122 #endif
4123 #ifdef CONFIG_IPV6_MROUTE
4124 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4125 #endif
4126 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4127 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4128 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4129 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4130 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4131 }
4132
4133 static inline size_t inet6_ifla6_size(void)
4134 {
4135 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4136 + nla_total_size(sizeof(struct ifla_cacheinfo))
4137 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4138 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4139 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4140 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4141 }
4142
4143 static inline size_t inet6_if_nlmsg_size(void)
4144 {
4145 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4146 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4147 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4148 + nla_total_size(4) /* IFLA_MTU */
4149 + nla_total_size(4) /* IFLA_LINK */
4150 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4151 }
4152
4153 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4154 int items, int bytes)
4155 {
4156 int i;
4157 int pad = bytes - sizeof(u64) * items;
4158 BUG_ON(pad < 0);
4159
4160 /* Use put_unaligned() because stats may not be aligned for u64. */
4161 put_unaligned(items, &stats[0]);
4162 for (i = 1; i < items; i++)
4163 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4164
4165 memset(&stats[items], 0, pad);
4166 }
4167
4168 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4169 int items, int bytes, size_t syncpoff)
4170 {
4171 int i;
4172 int pad = bytes - sizeof(u64) * items;
4173 BUG_ON(pad < 0);
4174
4175 /* Use put_unaligned() because stats may not be aligned for u64. */
4176 put_unaligned(items, &stats[0]);
4177 for (i = 1; i < items; i++)
4178 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4179
4180 memset(&stats[items], 0, pad);
4181 }
4182
4183 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4184 int bytes)
4185 {
4186 switch (attrtype) {
4187 case IFLA_INET6_STATS:
4188 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4189 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4190 break;
4191 case IFLA_INET6_ICMP6STATS:
4192 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4193 break;
4194 }
4195 }
4196
4197 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4198 {
4199 struct nlattr *nla;
4200 struct ifla_cacheinfo ci;
4201
4202 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4203 goto nla_put_failure;
4204 ci.max_reasm_len = IPV6_MAXPLEN;
4205 ci.tstamp = cstamp_delta(idev->tstamp);
4206 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4207 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4208 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4209 goto nla_put_failure;
4210 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4211 if (nla == NULL)
4212 goto nla_put_failure;
4213 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4214
4215 /* XXX - MC not implemented */
4216
4217 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4218 if (nla == NULL)
4219 goto nla_put_failure;
4220 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4221
4222 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4223 if (nla == NULL)
4224 goto nla_put_failure;
4225 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4226
4227 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4228 if (nla == NULL)
4229 goto nla_put_failure;
4230 read_lock_bh(&idev->lock);
4231 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4232 read_unlock_bh(&idev->lock);
4233
4234 return 0;
4235
4236 nla_put_failure:
4237 return -EMSGSIZE;
4238 }
4239
4240 static size_t inet6_get_link_af_size(const struct net_device *dev)
4241 {
4242 if (!__in6_dev_get(dev))
4243 return 0;
4244
4245 return inet6_ifla6_size();
4246 }
4247
4248 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4249 {
4250 struct inet6_dev *idev = __in6_dev_get(dev);
4251
4252 if (!idev)
4253 return -ENODATA;
4254
4255 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4256 return -EMSGSIZE;
4257
4258 return 0;
4259 }
4260
4261 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4262 {
4263 struct inet6_ifaddr *ifp;
4264 struct net_device *dev = idev->dev;
4265 bool update_rs = false;
4266 struct in6_addr ll_addr;
4267
4268 if (token == NULL)
4269 return -EINVAL;
4270 if (ipv6_addr_any(token))
4271 return -EINVAL;
4272 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4273 return -EINVAL;
4274 if (!ipv6_accept_ra(idev))
4275 return -EINVAL;
4276 if (idev->cnf.rtr_solicits <= 0)
4277 return -EINVAL;
4278
4279 write_lock_bh(&idev->lock);
4280
4281 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4282 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4283
4284 write_unlock_bh(&idev->lock);
4285
4286 if (!idev->dead && (idev->if_flags & IF_READY) &&
4287 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4288 IFA_F_OPTIMISTIC)) {
4289
4290 /* If we're not ready, then normal ifup will take care
4291 * of this. Otherwise, we need to request our rs here.
4292 */
4293 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4294 update_rs = true;
4295 }
4296
4297 write_lock_bh(&idev->lock);
4298
4299 if (update_rs) {
4300 idev->if_flags |= IF_RS_SENT;
4301 idev->rs_probes = 1;
4302 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4303 }
4304
4305 /* Well, that's kinda nasty ... */
4306 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4307 spin_lock(&ifp->lock);
4308 if (ifp->tokenized) {
4309 ifp->valid_lft = 0;
4310 ifp->prefered_lft = 0;
4311 }
4312 spin_unlock(&ifp->lock);
4313 }
4314
4315 write_unlock_bh(&idev->lock);
4316 addrconf_verify(0);
4317 return 0;
4318 }
4319
4320 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4321 {
4322 int err = -EINVAL;
4323 struct inet6_dev *idev = __in6_dev_get(dev);
4324 struct nlattr *tb[IFLA_INET6_MAX + 1];
4325
4326 if (!idev)
4327 return -EAFNOSUPPORT;
4328
4329 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4330 BUG();
4331
4332 if (tb[IFLA_INET6_TOKEN])
4333 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4334
4335 return err;
4336 }
4337
4338 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4339 u32 portid, u32 seq, int event, unsigned int flags)
4340 {
4341 struct net_device *dev = idev->dev;
4342 struct ifinfomsg *hdr;
4343 struct nlmsghdr *nlh;
4344 void *protoinfo;
4345
4346 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4347 if (nlh == NULL)
4348 return -EMSGSIZE;
4349
4350 hdr = nlmsg_data(nlh);
4351 hdr->ifi_family = AF_INET6;
4352 hdr->__ifi_pad = 0;
4353 hdr->ifi_type = dev->type;
4354 hdr->ifi_index = dev->ifindex;
4355 hdr->ifi_flags = dev_get_flags(dev);
4356 hdr->ifi_change = 0;
4357
4358 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4359 (dev->addr_len &&
4360 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4361 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4362 (dev->ifindex != dev->iflink &&
4363 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4364 goto nla_put_failure;
4365 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4366 if (protoinfo == NULL)
4367 goto nla_put_failure;
4368
4369 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4370 goto nla_put_failure;
4371
4372 nla_nest_end(skb, protoinfo);
4373 return nlmsg_end(skb, nlh);
4374
4375 nla_put_failure:
4376 nlmsg_cancel(skb, nlh);
4377 return -EMSGSIZE;
4378 }
4379
4380 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4381 {
4382 struct net *net = sock_net(skb->sk);
4383 int h, s_h;
4384 int idx = 0, s_idx;
4385 struct net_device *dev;
4386 struct inet6_dev *idev;
4387 struct hlist_head *head;
4388
4389 s_h = cb->args[0];
4390 s_idx = cb->args[1];
4391
4392 rcu_read_lock();
4393 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4394 idx = 0;
4395 head = &net->dev_index_head[h];
4396 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4397 if (idx < s_idx)
4398 goto cont;
4399 idev = __in6_dev_get(dev);
4400 if (!idev)
4401 goto cont;
4402 if (inet6_fill_ifinfo(skb, idev,
4403 NETLINK_CB(cb->skb).portid,
4404 cb->nlh->nlmsg_seq,
4405 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4406 goto out;
4407 cont:
4408 idx++;
4409 }
4410 }
4411 out:
4412 rcu_read_unlock();
4413 cb->args[1] = idx;
4414 cb->args[0] = h;
4415
4416 return skb->len;
4417 }
4418
4419 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4420 {
4421 struct sk_buff *skb;
4422 struct net *net = dev_net(idev->dev);
4423 int err = -ENOBUFS;
4424
4425 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4426 if (skb == NULL)
4427 goto errout;
4428
4429 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4430 if (err < 0) {
4431 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4432 WARN_ON(err == -EMSGSIZE);
4433 kfree_skb(skb);
4434 goto errout;
4435 }
4436 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4437 return;
4438 errout:
4439 if (err < 0)
4440 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4441 }
4442
4443 static inline size_t inet6_prefix_nlmsg_size(void)
4444 {
4445 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4446 + nla_total_size(sizeof(struct in6_addr))
4447 + nla_total_size(sizeof(struct prefix_cacheinfo));
4448 }
4449
4450 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4451 struct prefix_info *pinfo, u32 portid, u32 seq,
4452 int event, unsigned int flags)
4453 {
4454 struct prefixmsg *pmsg;
4455 struct nlmsghdr *nlh;
4456 struct prefix_cacheinfo ci;
4457
4458 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4459 if (nlh == NULL)
4460 return -EMSGSIZE;
4461
4462 pmsg = nlmsg_data(nlh);
4463 pmsg->prefix_family = AF_INET6;
4464 pmsg->prefix_pad1 = 0;
4465 pmsg->prefix_pad2 = 0;
4466 pmsg->prefix_ifindex = idev->dev->ifindex;
4467 pmsg->prefix_len = pinfo->prefix_len;
4468 pmsg->prefix_type = pinfo->type;
4469 pmsg->prefix_pad3 = 0;
4470 pmsg->prefix_flags = 0;
4471 if (pinfo->onlink)
4472 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4473 if (pinfo->autoconf)
4474 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4475
4476 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4477 goto nla_put_failure;
4478 ci.preferred_time = ntohl(pinfo->prefered);
4479 ci.valid_time = ntohl(pinfo->valid);
4480 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4481 goto nla_put_failure;
4482 return nlmsg_end(skb, nlh);
4483
4484 nla_put_failure:
4485 nlmsg_cancel(skb, nlh);
4486 return -EMSGSIZE;
4487 }
4488
4489 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4490 struct prefix_info *pinfo)
4491 {
4492 struct sk_buff *skb;
4493 struct net *net = dev_net(idev->dev);
4494 int err = -ENOBUFS;
4495
4496 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4497 if (skb == NULL)
4498 goto errout;
4499
4500 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4501 if (err < 0) {
4502 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4503 WARN_ON(err == -EMSGSIZE);
4504 kfree_skb(skb);
4505 goto errout;
4506 }
4507 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4508 return;
4509 errout:
4510 if (err < 0)
4511 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4512 }
4513
4514 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4515 {
4516 write_lock_bh(&ifp->idev->lock);
4517 spin_lock(&ifp->lock);
4518 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4519 IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4520 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4521 ifp->idev->valid_ll_addr_cnt += count;
4522 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4523 spin_unlock(&ifp->lock);
4524 write_unlock_bh(&ifp->idev->lock);
4525 }
4526
4527 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4528 {
4529 struct net *net = dev_net(ifp->idev->dev);
4530
4531 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4532
4533 switch (event) {
4534 case RTM_NEWADDR:
4535 update_valid_ll_addr_cnt(ifp, 1);
4536
4537 /*
4538 * If the address was optimistic
4539 * we inserted the route at the start of
4540 * our DAD process, so we don't need
4541 * to do it again
4542 */
4543 if (!(ifp->rt->rt6i_node))
4544 ip6_ins_rt(ifp->rt);
4545 if (ifp->idev->cnf.forwarding)
4546 addrconf_join_anycast(ifp);
4547 if (!ipv6_addr_any(&ifp->peer_addr))
4548 addrconf_prefix_route(&ifp->peer_addr, 128,
4549 ifp->idev->dev, 0, 0);
4550 break;
4551 case RTM_DELADDR:
4552 update_valid_ll_addr_cnt(ifp, -1);
4553
4554 if (ifp->idev->cnf.forwarding)
4555 addrconf_leave_anycast(ifp);
4556 addrconf_leave_solict(ifp->idev, &ifp->addr);
4557 if (!ipv6_addr_any(&ifp->peer_addr)) {
4558 struct rt6_info *rt;
4559 struct net_device *dev = ifp->idev->dev;
4560
4561 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4562 dev->ifindex, 1);
4563 if (rt) {
4564 dst_hold(&rt->dst);
4565 if (ip6_del_rt(rt))
4566 dst_free(&rt->dst);
4567 }
4568 }
4569 dst_hold(&ifp->rt->dst);
4570
4571 if (ip6_del_rt(ifp->rt))
4572 dst_free(&ifp->rt->dst);
4573 break;
4574 }
4575 atomic_inc(&net->ipv6.dev_addr_genid);
4576 rt_genid_bump_ipv6(net);
4577 }
4578
4579 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4580 {
4581 rcu_read_lock_bh();
4582 if (likely(ifp->idev->dead == 0))
4583 __ipv6_ifa_notify(event, ifp);
4584 rcu_read_unlock_bh();
4585 }
4586
4587 #ifdef CONFIG_SYSCTL
4588
4589 static
4590 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4591 void __user *buffer, size_t *lenp, loff_t *ppos)
4592 {
4593 int *valp = ctl->data;
4594 int val = *valp;
4595 loff_t pos = *ppos;
4596 struct ctl_table lctl;
4597 int ret;
4598
4599 /*
4600 * ctl->data points to idev->cnf.forwarding, we should
4601 * not modify it until we get the rtnl lock.
4602 */
4603 lctl = *ctl;
4604 lctl.data = &val;
4605
4606 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4607
4608 if (write)
4609 ret = addrconf_fixup_forwarding(ctl, valp, val);
4610 if (ret)
4611 *ppos = pos;
4612 return ret;
4613 }
4614
4615 static void dev_disable_change(struct inet6_dev *idev)
4616 {
4617 struct netdev_notifier_info info;
4618
4619 if (!idev || !idev->dev)
4620 return;
4621
4622 netdev_notifier_info_init(&info, idev->dev);
4623 if (idev->cnf.disable_ipv6)
4624 addrconf_notify(NULL, NETDEV_DOWN, &info);
4625 else
4626 addrconf_notify(NULL, NETDEV_UP, &info);
4627 }
4628
4629 static void addrconf_disable_change(struct net *net, __s32 newf)
4630 {
4631 struct net_device *dev;
4632 struct inet6_dev *idev;
4633
4634 rcu_read_lock();
4635 for_each_netdev_rcu(net, dev) {
4636 idev = __in6_dev_get(dev);
4637 if (idev) {
4638 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4639 idev->cnf.disable_ipv6 = newf;
4640 if (changed)
4641 dev_disable_change(idev);
4642 }
4643 }
4644 rcu_read_unlock();
4645 }
4646
4647 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4648 {
4649 struct net *net;
4650 int old;
4651
4652 if (!rtnl_trylock())
4653 return restart_syscall();
4654
4655 net = (struct net *)table->extra2;
4656 old = *p;
4657 *p = newf;
4658
4659 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4660 rtnl_unlock();
4661 return 0;
4662 }
4663
4664 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4665 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4666 addrconf_disable_change(net, newf);
4667 } else if ((!newf) ^ (!old))
4668 dev_disable_change((struct inet6_dev *)table->extra1);
4669
4670 rtnl_unlock();
4671 return 0;
4672 }
4673
4674 static
4675 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4676 void __user *buffer, size_t *lenp, loff_t *ppos)
4677 {
4678 int *valp = ctl->data;
4679 int val = *valp;
4680 loff_t pos = *ppos;
4681 struct ctl_table lctl;
4682 int ret;
4683
4684 /*
4685 * ctl->data points to idev->cnf.disable_ipv6, we should
4686 * not modify it until we get the rtnl lock.
4687 */
4688 lctl = *ctl;
4689 lctl.data = &val;
4690
4691 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4692
4693 if (write)
4694 ret = addrconf_disable_ipv6(ctl, valp, val);
4695 if (ret)
4696 *ppos = pos;
4697 return ret;
4698 }
4699
4700 static struct addrconf_sysctl_table
4701 {
4702 struct ctl_table_header *sysctl_header;
4703 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4704 } addrconf_sysctl __read_mostly = {
4705 .sysctl_header = NULL,
4706 .addrconf_vars = {
4707 {
4708 .procname = "forwarding",
4709 .data = &ipv6_devconf.forwarding,
4710 .maxlen = sizeof(int),
4711 .mode = 0644,
4712 .proc_handler = addrconf_sysctl_forward,
4713 },
4714 {
4715 .procname = "hop_limit",
4716 .data = &ipv6_devconf.hop_limit,
4717 .maxlen = sizeof(int),
4718 .mode = 0644,
4719 .proc_handler = proc_dointvec,
4720 },
4721 {
4722 .procname = "mtu",
4723 .data = &ipv6_devconf.mtu6,
4724 .maxlen = sizeof(int),
4725 .mode = 0644,
4726 .proc_handler = proc_dointvec,
4727 },
4728 {
4729 .procname = "accept_ra",
4730 .data = &ipv6_devconf.accept_ra,
4731 .maxlen = sizeof(int),
4732 .mode = 0644,
4733 .proc_handler = proc_dointvec,
4734 },
4735 {
4736 .procname = "accept_redirects",
4737 .data = &ipv6_devconf.accept_redirects,
4738 .maxlen = sizeof(int),
4739 .mode = 0644,
4740 .proc_handler = proc_dointvec,
4741 },
4742 {
4743 .procname = "autoconf",
4744 .data = &ipv6_devconf.autoconf,
4745 .maxlen = sizeof(int),
4746 .mode = 0644,
4747 .proc_handler = proc_dointvec,
4748 },
4749 {
4750 .procname = "dad_transmits",
4751 .data = &ipv6_devconf.dad_transmits,
4752 .maxlen = sizeof(int),
4753 .mode = 0644,
4754 .proc_handler = proc_dointvec,
4755 },
4756 {
4757 .procname = "router_solicitations",
4758 .data = &ipv6_devconf.rtr_solicits,
4759 .maxlen = sizeof(int),
4760 .mode = 0644,
4761 .proc_handler = proc_dointvec,
4762 },
4763 {
4764 .procname = "router_solicitation_interval",
4765 .data = &ipv6_devconf.rtr_solicit_interval,
4766 .maxlen = sizeof(int),
4767 .mode = 0644,
4768 .proc_handler = proc_dointvec_jiffies,
4769 },
4770 {
4771 .procname = "router_solicitation_delay",
4772 .data = &ipv6_devconf.rtr_solicit_delay,
4773 .maxlen = sizeof(int),
4774 .mode = 0644,
4775 .proc_handler = proc_dointvec_jiffies,
4776 },
4777 {
4778 .procname = "force_mld_version",
4779 .data = &ipv6_devconf.force_mld_version,
4780 .maxlen = sizeof(int),
4781 .mode = 0644,
4782 .proc_handler = proc_dointvec,
4783 },
4784 {
4785 .procname = "mldv1_unsolicited_report_interval",
4786 .data =
4787 &ipv6_devconf.mldv1_unsolicited_report_interval,
4788 .maxlen = sizeof(int),
4789 .mode = 0644,
4790 .proc_handler = proc_dointvec_ms_jiffies,
4791 },
4792 {
4793 .procname = "mldv2_unsolicited_report_interval",
4794 .data =
4795 &ipv6_devconf.mldv2_unsolicited_report_interval,
4796 .maxlen = sizeof(int),
4797 .mode = 0644,
4798 .proc_handler = proc_dointvec_ms_jiffies,
4799 },
4800 {
4801 .procname = "use_tempaddr",
4802 .data = &ipv6_devconf.use_tempaddr,
4803 .maxlen = sizeof(int),
4804 .mode = 0644,
4805 .proc_handler = proc_dointvec,
4806 },
4807 {
4808 .procname = "temp_valid_lft",
4809 .data = &ipv6_devconf.temp_valid_lft,
4810 .maxlen = sizeof(int),
4811 .mode = 0644,
4812 .proc_handler = proc_dointvec,
4813 },
4814 {
4815 .procname = "temp_prefered_lft",
4816 .data = &ipv6_devconf.temp_prefered_lft,
4817 .maxlen = sizeof(int),
4818 .mode = 0644,
4819 .proc_handler = proc_dointvec,
4820 },
4821 {
4822 .procname = "regen_max_retry",
4823 .data = &ipv6_devconf.regen_max_retry,
4824 .maxlen = sizeof(int),
4825 .mode = 0644,
4826 .proc_handler = proc_dointvec,
4827 },
4828 {
4829 .procname = "max_desync_factor",
4830 .data = &ipv6_devconf.max_desync_factor,
4831 .maxlen = sizeof(int),
4832 .mode = 0644,
4833 .proc_handler = proc_dointvec,
4834 },
4835 {
4836 .procname = "max_addresses",
4837 .data = &ipv6_devconf.max_addresses,
4838 .maxlen = sizeof(int),
4839 .mode = 0644,
4840 .proc_handler = proc_dointvec,
4841 },
4842 {
4843 .procname = "accept_ra_defrtr",
4844 .data = &ipv6_devconf.accept_ra_defrtr,
4845 .maxlen = sizeof(int),
4846 .mode = 0644,
4847 .proc_handler = proc_dointvec,
4848 },
4849 {
4850 .procname = "accept_ra_pinfo",
4851 .data = &ipv6_devconf.accept_ra_pinfo,
4852 .maxlen = sizeof(int),
4853 .mode = 0644,
4854 .proc_handler = proc_dointvec,
4855 },
4856 #ifdef CONFIG_IPV6_ROUTER_PREF
4857 {
4858 .procname = "accept_ra_rtr_pref",
4859 .data = &ipv6_devconf.accept_ra_rtr_pref,
4860 .maxlen = sizeof(int),
4861 .mode = 0644,
4862 .proc_handler = proc_dointvec,
4863 },
4864 {
4865 .procname = "router_probe_interval",
4866 .data = &ipv6_devconf.rtr_probe_interval,
4867 .maxlen = sizeof(int),
4868 .mode = 0644,
4869 .proc_handler = proc_dointvec_jiffies,
4870 },
4871 #ifdef CONFIG_IPV6_ROUTE_INFO
4872 {
4873 .procname = "accept_ra_rt_info_max_plen",
4874 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4875 .maxlen = sizeof(int),
4876 .mode = 0644,
4877 .proc_handler = proc_dointvec,
4878 },
4879 #endif
4880 #endif
4881 {
4882 .procname = "proxy_ndp",
4883 .data = &ipv6_devconf.proxy_ndp,
4884 .maxlen = sizeof(int),
4885 .mode = 0644,
4886 .proc_handler = proc_dointvec,
4887 },
4888 {
4889 .procname = "accept_source_route",
4890 .data = &ipv6_devconf.accept_source_route,
4891 .maxlen = sizeof(int),
4892 .mode = 0644,
4893 .proc_handler = proc_dointvec,
4894 },
4895 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4896 {
4897 .procname = "optimistic_dad",
4898 .data = &ipv6_devconf.optimistic_dad,
4899 .maxlen = sizeof(int),
4900 .mode = 0644,
4901 .proc_handler = proc_dointvec,
4902
4903 },
4904 #endif
4905 #ifdef CONFIG_IPV6_MROUTE
4906 {
4907 .procname = "mc_forwarding",
4908 .data = &ipv6_devconf.mc_forwarding,
4909 .maxlen = sizeof(int),
4910 .mode = 0444,
4911 .proc_handler = proc_dointvec,
4912 },
4913 #endif
4914 {
4915 .procname = "disable_ipv6",
4916 .data = &ipv6_devconf.disable_ipv6,
4917 .maxlen = sizeof(int),
4918 .mode = 0644,
4919 .proc_handler = addrconf_sysctl_disable,
4920 },
4921 {
4922 .procname = "accept_dad",
4923 .data = &ipv6_devconf.accept_dad,
4924 .maxlen = sizeof(int),
4925 .mode = 0644,
4926 .proc_handler = proc_dointvec,
4927 },
4928 {
4929 .procname = "force_tllao",
4930 .data = &ipv6_devconf.force_tllao,
4931 .maxlen = sizeof(int),
4932 .mode = 0644,
4933 .proc_handler = proc_dointvec
4934 },
4935 {
4936 .procname = "ndisc_notify",
4937 .data = &ipv6_devconf.ndisc_notify,
4938 .maxlen = sizeof(int),
4939 .mode = 0644,
4940 .proc_handler = proc_dointvec
4941 },
4942 {
4943 .procname = "suppress_frag_ndisc",
4944 .data = &ipv6_devconf.suppress_frag_ndisc,
4945 .maxlen = sizeof(int),
4946 .mode = 0644,
4947 .proc_handler = proc_dointvec
4948 },
4949 {
4950 /* sentinel */
4951 }
4952 },
4953 };
4954
4955 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4956 struct inet6_dev *idev, struct ipv6_devconf *p)
4957 {
4958 int i;
4959 struct addrconf_sysctl_table *t;
4960 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4961
4962 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4963 if (t == NULL)
4964 goto out;
4965
4966 for (i = 0; t->addrconf_vars[i].data; i++) {
4967 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4968 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4969 t->addrconf_vars[i].extra2 = net;
4970 }
4971
4972 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4973
4974 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4975 if (t->sysctl_header == NULL)
4976 goto free;
4977
4978 p->sysctl = t;
4979 return 0;
4980
4981 free:
4982 kfree(t);
4983 out:
4984 return -ENOBUFS;
4985 }
4986
4987 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4988 {
4989 struct addrconf_sysctl_table *t;
4990
4991 if (p->sysctl == NULL)
4992 return;
4993
4994 t = p->sysctl;
4995 p->sysctl = NULL;
4996 unregister_net_sysctl_table(t->sysctl_header);
4997 kfree(t);
4998 }
4999
5000 static void addrconf_sysctl_register(struct inet6_dev *idev)
5001 {
5002 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
5003 &ndisc_ifinfo_sysctl_change);
5004 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5005 idev, &idev->cnf);
5006 }
5007
5008 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5009 {
5010 __addrconf_sysctl_unregister(&idev->cnf);
5011 neigh_sysctl_unregister(idev->nd_parms);
5012 }
5013
5014
5015 #endif
5016
5017 static int __net_init addrconf_init_net(struct net *net)
5018 {
5019 int err = -ENOMEM;
5020 struct ipv6_devconf *all, *dflt;
5021
5022 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5023 if (all == NULL)
5024 goto err_alloc_all;
5025
5026 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5027 if (dflt == NULL)
5028 goto err_alloc_dflt;
5029
5030 /* these will be inherited by all namespaces */
5031 dflt->autoconf = ipv6_defaults.autoconf;
5032 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5033
5034 net->ipv6.devconf_all = all;
5035 net->ipv6.devconf_dflt = dflt;
5036
5037 #ifdef CONFIG_SYSCTL
5038 err = __addrconf_sysctl_register(net, "all", NULL, all);
5039 if (err < 0)
5040 goto err_reg_all;
5041
5042 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5043 if (err < 0)
5044 goto err_reg_dflt;
5045 #endif
5046 return 0;
5047
5048 #ifdef CONFIG_SYSCTL
5049 err_reg_dflt:
5050 __addrconf_sysctl_unregister(all);
5051 err_reg_all:
5052 kfree(dflt);
5053 #endif
5054 err_alloc_dflt:
5055 kfree(all);
5056 err_alloc_all:
5057 return err;
5058 }
5059
5060 static void __net_exit addrconf_exit_net(struct net *net)
5061 {
5062 #ifdef CONFIG_SYSCTL
5063 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5064 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5065 #endif
5066 if (!net_eq(net, &init_net)) {
5067 kfree(net->ipv6.devconf_dflt);
5068 kfree(net->ipv6.devconf_all);
5069 }
5070 }
5071
5072 static struct pernet_operations addrconf_ops = {
5073 .init = addrconf_init_net,
5074 .exit = addrconf_exit_net,
5075 };
5076
5077 static struct rtnl_af_ops inet6_ops = {
5078 .family = AF_INET6,
5079 .fill_link_af = inet6_fill_link_af,
5080 .get_link_af_size = inet6_get_link_af_size,
5081 .set_link_af = inet6_set_link_af,
5082 };
5083
5084 /*
5085 * Init / cleanup code
5086 */
5087
5088 int __init addrconf_init(void)
5089 {
5090 int i, err;
5091
5092 err = ipv6_addr_label_init();
5093 if (err < 0) {
5094 pr_crit("%s: cannot initialize default policy table: %d\n",
5095 __func__, err);
5096 goto out;
5097 }
5098
5099 err = register_pernet_subsys(&addrconf_ops);
5100 if (err < 0)
5101 goto out_addrlabel;
5102
5103 /* The addrconf netdev notifier requires that loopback_dev
5104 * has it's ipv6 private information allocated and setup
5105 * before it can bring up and give link-local addresses
5106 * to other devices which are up.
5107 *
5108 * Unfortunately, loopback_dev is not necessarily the first
5109 * entry in the global dev_base list of net devices. In fact,
5110 * it is likely to be the very last entry on that list.
5111 * So this causes the notifier registry below to try and
5112 * give link-local addresses to all devices besides loopback_dev
5113 * first, then loopback_dev, which cases all the non-loopback_dev
5114 * devices to fail to get a link-local address.
5115 *
5116 * So, as a temporary fix, allocate the ipv6 structure for
5117 * loopback_dev first by hand.
5118 * Longer term, all of the dependencies ipv6 has upon the loopback
5119 * device and it being up should be removed.
5120 */
5121 rtnl_lock();
5122 if (!ipv6_add_dev(init_net.loopback_dev))
5123 err = -ENOMEM;
5124 rtnl_unlock();
5125 if (err)
5126 goto errlo;
5127
5128 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5129 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5130
5131 register_netdevice_notifier(&ipv6_dev_notf);
5132
5133 addrconf_verify(0);
5134
5135 err = rtnl_af_register(&inet6_ops);
5136 if (err < 0)
5137 goto errout_af;
5138
5139 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5140 NULL);
5141 if (err < 0)
5142 goto errout;
5143
5144 /* Only the first call to __rtnl_register can fail */
5145 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5146 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5147 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5148 inet6_dump_ifaddr, NULL);
5149 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5150 inet6_dump_ifmcaddr, NULL);
5151 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5152 inet6_dump_ifacaddr, NULL);
5153 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5154 inet6_netconf_dump_devconf, NULL);
5155
5156 ipv6_addr_label_rtnl_register();
5157
5158 return 0;
5159 errout:
5160 rtnl_af_unregister(&inet6_ops);
5161 errout_af:
5162 unregister_netdevice_notifier(&ipv6_dev_notf);
5163 errlo:
5164 unregister_pernet_subsys(&addrconf_ops);
5165 out_addrlabel:
5166 ipv6_addr_label_cleanup();
5167 out:
5168 return err;
5169 }
5170
5171 void addrconf_cleanup(void)
5172 {
5173 struct net_device *dev;
5174 int i;
5175
5176 unregister_netdevice_notifier(&ipv6_dev_notf);
5177 unregister_pernet_subsys(&addrconf_ops);
5178 ipv6_addr_label_cleanup();
5179
5180 rtnl_lock();
5181
5182 __rtnl_af_unregister(&inet6_ops);
5183
5184 /* clean dev list */
5185 for_each_netdev(&init_net, dev) {
5186 if (__in6_dev_get(dev) == NULL)
5187 continue;
5188 addrconf_ifdown(dev, 1);
5189 }
5190 addrconf_ifdown(init_net.loopback_dev, 2);
5191
5192 /*
5193 * Check hash table.
5194 */
5195 spin_lock_bh(&addrconf_hash_lock);
5196 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5197 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5198 spin_unlock_bh(&addrconf_hash_lock);
5199
5200 del_timer(&addr_chk_timer);
5201 rtnl_unlock();
5202 }
Linux kernel - Deliverables
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