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net: Explicitly initialize u64_stats_sync structures for lockdep
[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
87 #ifdef CONFIG_IPV6_PRIVACY
88 #include <linux/random.h>
89 #endif
90
91 #include <linux/uaccess.h>
92 #include <asm/unaligned.h>
93
94 #include <linux/proc_fs.h>
95 #include <linux/seq_file.h>
96 #include <linux/export.h>
97
98 /* Set to 3 to get tracing... */
99 #define ACONF_DEBUG 2
100
101 #if ACONF_DEBUG >= 3
102 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
103 #else
104 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
105 #endif
106
107 #define INFINITY_LIFE_TIME 0xFFFFFFFF
108
109 static inline u32 cstamp_delta(unsigned long cstamp)
110 {
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
112 }
113
114 #ifdef CONFIG_SYSCTL
115 static void addrconf_sysctl_register(struct inet6_dev *idev);
116 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
117 #else
118 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
119 {
120 }
121
122 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
123 {
124 }
125 #endif
126
127 #ifdef CONFIG_IPV6_PRIVACY
128 static void __ipv6_regen_rndid(struct inet6_dev *idev);
129 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
130 static void ipv6_regen_rndid(unsigned long data);
131 #endif
132
133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
134 static int ipv6_count_addresses(struct inet6_dev *idev);
135
136 /*
137 * Configured unicast address hash table
138 */
139 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
140 static DEFINE_SPINLOCK(addrconf_hash_lock);
141
142 static void addrconf_verify(unsigned long);
143
144 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
145 static DEFINE_SPINLOCK(addrconf_verify_lock);
146
147 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
148 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
149
150 static void addrconf_type_change(struct net_device *dev,
151 unsigned long event);
152 static int addrconf_ifdown(struct net_device *dev, int how);
153
154 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
155 int plen,
156 const struct net_device *dev,
157 u32 flags, u32 noflags);
158
159 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
160 static void addrconf_dad_timer(unsigned long data);
161 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
162 static void addrconf_dad_run(struct inet6_dev *idev);
163 static void addrconf_rs_timer(unsigned long data);
164 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
165 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
166
167 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
168 struct prefix_info *pinfo);
169 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
170 struct net_device *dev);
171
172 static struct ipv6_devconf ipv6_devconf __read_mostly = {
173 .forwarding = 0,
174 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
175 .mtu6 = IPV6_MIN_MTU,
176 .accept_ra = 1,
177 .accept_redirects = 1,
178 .autoconf = 1,
179 .force_mld_version = 0,
180 .mldv1_unsolicited_report_interval = 10 * HZ,
181 .mldv2_unsolicited_report_interval = HZ,
182 .dad_transmits = 1,
183 .rtr_solicits = MAX_RTR_SOLICITATIONS,
184 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
185 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
186 #ifdef CONFIG_IPV6_PRIVACY
187 .use_tempaddr = 0,
188 .temp_valid_lft = TEMP_VALID_LIFETIME,
189 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
190 .regen_max_retry = REGEN_MAX_RETRY,
191 .max_desync_factor = MAX_DESYNC_FACTOR,
192 #endif
193 .max_addresses = IPV6_MAX_ADDRESSES,
194 .accept_ra_defrtr = 1,
195 .accept_ra_pinfo = 1,
196 #ifdef CONFIG_IPV6_ROUTER_PREF
197 .accept_ra_rtr_pref = 1,
198 .rtr_probe_interval = 60 * HZ,
199 #ifdef CONFIG_IPV6_ROUTE_INFO
200 .accept_ra_rt_info_max_plen = 0,
201 #endif
202 #endif
203 .proxy_ndp = 0,
204 .accept_source_route = 0, /* we do not accept RH0 by default. */
205 .disable_ipv6 = 0,
206 .accept_dad = 1,
207 .suppress_frag_ndisc = 1,
208 };
209
210 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
211 .forwarding = 0,
212 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
213 .mtu6 = IPV6_MIN_MTU,
214 .accept_ra = 1,
215 .accept_redirects = 1,
216 .autoconf = 1,
217 .force_mld_version = 0,
218 .mldv1_unsolicited_report_interval = 10 * HZ,
219 .mldv2_unsolicited_report_interval = HZ,
220 .dad_transmits = 1,
221 .rtr_solicits = MAX_RTR_SOLICITATIONS,
222 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
223 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
224 #ifdef CONFIG_IPV6_PRIVACY
225 .use_tempaddr = 0,
226 .temp_valid_lft = TEMP_VALID_LIFETIME,
227 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
228 .regen_max_retry = REGEN_MAX_RETRY,
229 .max_desync_factor = MAX_DESYNC_FACTOR,
230 #endif
231 .max_addresses = IPV6_MAX_ADDRESSES,
232 .accept_ra_defrtr = 1,
233 .accept_ra_pinfo = 1,
234 #ifdef CONFIG_IPV6_ROUTER_PREF
235 .accept_ra_rtr_pref = 1,
236 .rtr_probe_interval = 60 * HZ,
237 #ifdef CONFIG_IPV6_ROUTE_INFO
238 .accept_ra_rt_info_max_plen = 0,
239 #endif
240 #endif
241 .proxy_ndp = 0,
242 .accept_source_route = 0, /* we do not accept RH0 by default. */
243 .disable_ipv6 = 0,
244 .accept_dad = 1,
245 .suppress_frag_ndisc = 1,
246 };
247
248 /* Check if a valid qdisc is available */
249 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
250 {
251 return !qdisc_tx_is_noop(dev);
252 }
253
254 static void addrconf_del_rs_timer(struct inet6_dev *idev)
255 {
256 if (del_timer(&idev->rs_timer))
257 __in6_dev_put(idev);
258 }
259
260 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
261 {
262 if (del_timer(&ifp->dad_timer))
263 __in6_ifa_put(ifp);
264 }
265
266 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
267 unsigned long when)
268 {
269 if (!timer_pending(&idev->rs_timer))
270 in6_dev_hold(idev);
271 mod_timer(&idev->rs_timer, jiffies + when);
272 }
273
274 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
275 unsigned long when)
276 {
277 if (!timer_pending(&ifp->dad_timer))
278 in6_ifa_hold(ifp);
279 mod_timer(&ifp->dad_timer, jiffies + when);
280 }
281
282 static int snmp6_alloc_dev(struct inet6_dev *idev)
283 {
284 int i;
285
286 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
287 sizeof(struct ipstats_mib),
288 __alignof__(struct ipstats_mib)) < 0)
289 goto err_ip;
290
291 for_each_possible_cpu(i) {
292 struct ipstats_mib *addrconf_stats;
293 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[0], i);
294 u64_stats_init(&addrconf_stats->syncp);
295 #if SNMP_ARRAY_SZ == 2
296 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[1], i);
297 u64_stats_init(&addrconf_stats->syncp);
298 #endif
299 }
300
301
302 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
303 GFP_KERNEL);
304 if (!idev->stats.icmpv6dev)
305 goto err_icmp;
306 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
307 GFP_KERNEL);
308 if (!idev->stats.icmpv6msgdev)
309 goto err_icmpmsg;
310
311 return 0;
312
313 err_icmpmsg:
314 kfree(idev->stats.icmpv6dev);
315 err_icmp:
316 snmp_mib_free((void __percpu **)idev->stats.ipv6);
317 err_ip:
318 return -ENOMEM;
319 }
320
321 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
322 {
323 struct inet6_dev *ndev;
324
325 ASSERT_RTNL();
326
327 if (dev->mtu < IPV6_MIN_MTU)
328 return NULL;
329
330 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
331
332 if (ndev == NULL)
333 return NULL;
334
335 rwlock_init(&ndev->lock);
336 ndev->dev = dev;
337 INIT_LIST_HEAD(&ndev->addr_list);
338 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
339 (unsigned long)ndev);
340 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
341 ndev->cnf.mtu6 = dev->mtu;
342 ndev->cnf.sysctl = NULL;
343 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
344 if (ndev->nd_parms == NULL) {
345 kfree(ndev);
346 return NULL;
347 }
348 if (ndev->cnf.forwarding)
349 dev_disable_lro(dev);
350 /* We refer to the device */
351 dev_hold(dev);
352
353 if (snmp6_alloc_dev(ndev) < 0) {
354 ADBG(KERN_WARNING
355 "%s: cannot allocate memory for statistics; dev=%s.\n",
356 __func__, dev->name);
357 neigh_parms_release(&nd_tbl, ndev->nd_parms);
358 dev_put(dev);
359 kfree(ndev);
360 return NULL;
361 }
362
363 if (snmp6_register_dev(ndev) < 0) {
364 ADBG(KERN_WARNING
365 "%s: cannot create /proc/net/dev_snmp6/%s\n",
366 __func__, dev->name);
367 neigh_parms_release(&nd_tbl, ndev->nd_parms);
368 ndev->dead = 1;
369 in6_dev_finish_destroy(ndev);
370 return NULL;
371 }
372
373 /* One reference from device. We must do this before
374 * we invoke __ipv6_regen_rndid().
375 */
376 in6_dev_hold(ndev);
377
378 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
379 ndev->cnf.accept_dad = -1;
380
381 #if IS_ENABLED(CONFIG_IPV6_SIT)
382 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
383 pr_info("%s: Disabled Multicast RS\n", dev->name);
384 ndev->cnf.rtr_solicits = 0;
385 }
386 #endif
387
388 #ifdef CONFIG_IPV6_PRIVACY
389 INIT_LIST_HEAD(&ndev->tempaddr_list);
390 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
391 if ((dev->flags&IFF_LOOPBACK) ||
392 dev->type == ARPHRD_TUNNEL ||
393 dev->type == ARPHRD_TUNNEL6 ||
394 dev->type == ARPHRD_SIT ||
395 dev->type == ARPHRD_NONE) {
396 ndev->cnf.use_tempaddr = -1;
397 } else {
398 in6_dev_hold(ndev);
399 ipv6_regen_rndid((unsigned long) ndev);
400 }
401 #endif
402 ndev->token = in6addr_any;
403
404 if (netif_running(dev) && addrconf_qdisc_ok(dev))
405 ndev->if_flags |= IF_READY;
406
407 ipv6_mc_init_dev(ndev);
408 ndev->tstamp = jiffies;
409 addrconf_sysctl_register(ndev);
410 /* protected by rtnl_lock */
411 rcu_assign_pointer(dev->ip6_ptr, ndev);
412
413 /* Join interface-local all-node multicast group */
414 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
415
416 /* Join all-node multicast group */
417 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
418
419 /* Join all-router multicast group if forwarding is set */
420 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
421 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
422
423 return ndev;
424 }
425
426 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
427 {
428 struct inet6_dev *idev;
429
430 ASSERT_RTNL();
431
432 idev = __in6_dev_get(dev);
433 if (!idev) {
434 idev = ipv6_add_dev(dev);
435 if (!idev)
436 return NULL;
437 }
438
439 if (dev->flags&IFF_UP)
440 ipv6_mc_up(idev);
441 return idev;
442 }
443
444 static int inet6_netconf_msgsize_devconf(int type)
445 {
446 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
447 + nla_total_size(4); /* NETCONFA_IFINDEX */
448
449 /* type -1 is used for ALL */
450 if (type == -1 || type == NETCONFA_FORWARDING)
451 size += nla_total_size(4);
452 #ifdef CONFIG_IPV6_MROUTE
453 if (type == -1 || type == NETCONFA_MC_FORWARDING)
454 size += nla_total_size(4);
455 #endif
456
457 return size;
458 }
459
460 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
461 struct ipv6_devconf *devconf, u32 portid,
462 u32 seq, int event, unsigned int flags,
463 int type)
464 {
465 struct nlmsghdr *nlh;
466 struct netconfmsg *ncm;
467
468 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
469 flags);
470 if (nlh == NULL)
471 return -EMSGSIZE;
472
473 ncm = nlmsg_data(nlh);
474 ncm->ncm_family = AF_INET6;
475
476 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
477 goto nla_put_failure;
478
479 /* type -1 is used for ALL */
480 if ((type == -1 || type == NETCONFA_FORWARDING) &&
481 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
482 goto nla_put_failure;
483 #ifdef CONFIG_IPV6_MROUTE
484 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
485 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
486 devconf->mc_forwarding) < 0)
487 goto nla_put_failure;
488 #endif
489 return nlmsg_end(skb, nlh);
490
491 nla_put_failure:
492 nlmsg_cancel(skb, nlh);
493 return -EMSGSIZE;
494 }
495
496 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
497 struct ipv6_devconf *devconf)
498 {
499 struct sk_buff *skb;
500 int err = -ENOBUFS;
501
502 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
503 if (skb == NULL)
504 goto errout;
505
506 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
507 RTM_NEWNETCONF, 0, type);
508 if (err < 0) {
509 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
510 WARN_ON(err == -EMSGSIZE);
511 kfree_skb(skb);
512 goto errout;
513 }
514 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
515 return;
516 errout:
517 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
518 }
519
520 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
521 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
522 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
523 };
524
525 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
526 struct nlmsghdr *nlh)
527 {
528 struct net *net = sock_net(in_skb->sk);
529 struct nlattr *tb[NETCONFA_MAX+1];
530 struct netconfmsg *ncm;
531 struct sk_buff *skb;
532 struct ipv6_devconf *devconf;
533 struct inet6_dev *in6_dev;
534 struct net_device *dev;
535 int ifindex;
536 int err;
537
538 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
539 devconf_ipv6_policy);
540 if (err < 0)
541 goto errout;
542
543 err = EINVAL;
544 if (!tb[NETCONFA_IFINDEX])
545 goto errout;
546
547 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
548 switch (ifindex) {
549 case NETCONFA_IFINDEX_ALL:
550 devconf = net->ipv6.devconf_all;
551 break;
552 case NETCONFA_IFINDEX_DEFAULT:
553 devconf = net->ipv6.devconf_dflt;
554 break;
555 default:
556 dev = __dev_get_by_index(net, ifindex);
557 if (dev == NULL)
558 goto errout;
559 in6_dev = __in6_dev_get(dev);
560 if (in6_dev == NULL)
561 goto errout;
562 devconf = &in6_dev->cnf;
563 break;
564 }
565
566 err = -ENOBUFS;
567 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
568 if (skb == NULL)
569 goto errout;
570
571 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
572 NETLINK_CB(in_skb).portid,
573 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
574 -1);
575 if (err < 0) {
576 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
577 WARN_ON(err == -EMSGSIZE);
578 kfree_skb(skb);
579 goto errout;
580 }
581 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
582 errout:
583 return err;
584 }
585
586 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
587 struct netlink_callback *cb)
588 {
589 struct net *net = sock_net(skb->sk);
590 int h, s_h;
591 int idx, s_idx;
592 struct net_device *dev;
593 struct inet6_dev *idev;
594 struct hlist_head *head;
595
596 s_h = cb->args[0];
597 s_idx = idx = cb->args[1];
598
599 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
600 idx = 0;
601 head = &net->dev_index_head[h];
602 rcu_read_lock();
603 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
604 net->dev_base_seq;
605 hlist_for_each_entry_rcu(dev, head, index_hlist) {
606 if (idx < s_idx)
607 goto cont;
608 idev = __in6_dev_get(dev);
609 if (!idev)
610 goto cont;
611
612 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
613 &idev->cnf,
614 NETLINK_CB(cb->skb).portid,
615 cb->nlh->nlmsg_seq,
616 RTM_NEWNETCONF,
617 NLM_F_MULTI,
618 -1) <= 0) {
619 rcu_read_unlock();
620 goto done;
621 }
622 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
623 cont:
624 idx++;
625 }
626 rcu_read_unlock();
627 }
628 if (h == NETDEV_HASHENTRIES) {
629 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
630 net->ipv6.devconf_all,
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 if (h == NETDEV_HASHENTRIES + 1) {
640 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
641 net->ipv6.devconf_dflt,
642 NETLINK_CB(cb->skb).portid,
643 cb->nlh->nlmsg_seq,
644 RTM_NEWNETCONF, NLM_F_MULTI,
645 -1) <= 0)
646 goto done;
647 else
648 h++;
649 }
650 done:
651 cb->args[0] = h;
652 cb->args[1] = idx;
653
654 return skb->len;
655 }
656
657 #ifdef CONFIG_SYSCTL
658 static void dev_forward_change(struct inet6_dev *idev)
659 {
660 struct net_device *dev;
661 struct inet6_ifaddr *ifa;
662
663 if (!idev)
664 return;
665 dev = idev->dev;
666 if (idev->cnf.forwarding)
667 dev_disable_lro(dev);
668 if (dev->flags & IFF_MULTICAST) {
669 if (idev->cnf.forwarding) {
670 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
671 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
672 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
673 } else {
674 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
675 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
676 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
677 }
678 }
679
680 list_for_each_entry(ifa, &idev->addr_list, if_list) {
681 if (ifa->flags&IFA_F_TENTATIVE)
682 continue;
683 if (idev->cnf.forwarding)
684 addrconf_join_anycast(ifa);
685 else
686 addrconf_leave_anycast(ifa);
687 }
688 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
689 dev->ifindex, &idev->cnf);
690 }
691
692
693 static void addrconf_forward_change(struct net *net, __s32 newf)
694 {
695 struct net_device *dev;
696 struct inet6_dev *idev;
697
698 for_each_netdev(net, dev) {
699 idev = __in6_dev_get(dev);
700 if (idev) {
701 int changed = (!idev->cnf.forwarding) ^ (!newf);
702 idev->cnf.forwarding = newf;
703 if (changed)
704 dev_forward_change(idev);
705 }
706 }
707 }
708
709 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
710 {
711 struct net *net;
712 int old;
713
714 if (!rtnl_trylock())
715 return restart_syscall();
716
717 net = (struct net *)table->extra2;
718 old = *p;
719 *p = newf;
720
721 if (p == &net->ipv6.devconf_dflt->forwarding) {
722 if ((!newf) ^ (!old))
723 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
724 NETCONFA_IFINDEX_DEFAULT,
725 net->ipv6.devconf_dflt);
726 rtnl_unlock();
727 return 0;
728 }
729
730 if (p == &net->ipv6.devconf_all->forwarding) {
731 net->ipv6.devconf_dflt->forwarding = newf;
732 addrconf_forward_change(net, newf);
733 if ((!newf) ^ (!old))
734 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
735 NETCONFA_IFINDEX_ALL,
736 net->ipv6.devconf_all);
737 } else if ((!newf) ^ (!old))
738 dev_forward_change((struct inet6_dev *)table->extra1);
739 rtnl_unlock();
740
741 if (newf)
742 rt6_purge_dflt_routers(net);
743 return 1;
744 }
745 #endif
746
747 /* Nobody refers to this ifaddr, destroy it */
748 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
749 {
750 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
751
752 #ifdef NET_REFCNT_DEBUG
753 pr_debug("%s\n", __func__);
754 #endif
755
756 in6_dev_put(ifp->idev);
757
758 if (del_timer(&ifp->dad_timer))
759 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
760
761 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
762 pr_warn("Freeing alive inet6 address %p\n", ifp);
763 return;
764 }
765 ip6_rt_put(ifp->rt);
766
767 kfree_rcu(ifp, rcu);
768 }
769
770 static void
771 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
772 {
773 struct list_head *p;
774 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
775
776 /*
777 * Each device address list is sorted in order of scope -
778 * global before linklocal.
779 */
780 list_for_each(p, &idev->addr_list) {
781 struct inet6_ifaddr *ifa
782 = list_entry(p, struct inet6_ifaddr, if_list);
783 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
784 break;
785 }
786
787 list_add_tail(&ifp->if_list, p);
788 }
789
790 static u32 inet6_addr_hash(const struct in6_addr *addr)
791 {
792 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
793 }
794
795 /* On success it returns ifp with increased reference count */
796
797 static struct inet6_ifaddr *
798 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
799 const struct in6_addr *peer_addr, int pfxlen,
800 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
801 {
802 struct inet6_ifaddr *ifa = NULL;
803 struct rt6_info *rt;
804 unsigned int hash;
805 int err = 0;
806 int addr_type = ipv6_addr_type(addr);
807
808 if (addr_type == IPV6_ADDR_ANY ||
809 addr_type & IPV6_ADDR_MULTICAST ||
810 (!(idev->dev->flags & IFF_LOOPBACK) &&
811 addr_type & IPV6_ADDR_LOOPBACK))
812 return ERR_PTR(-EADDRNOTAVAIL);
813
814 rcu_read_lock_bh();
815 if (idev->dead) {
816 err = -ENODEV; /*XXX*/
817 goto out2;
818 }
819
820 if (idev->cnf.disable_ipv6) {
821 err = -EACCES;
822 goto out2;
823 }
824
825 spin_lock(&addrconf_hash_lock);
826
827 /* Ignore adding duplicate addresses on an interface */
828 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
829 ADBG("ipv6_add_addr: already assigned\n");
830 err = -EEXIST;
831 goto out;
832 }
833
834 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
835
836 if (ifa == NULL) {
837 ADBG("ipv6_add_addr: malloc failed\n");
838 err = -ENOBUFS;
839 goto out;
840 }
841
842 rt = addrconf_dst_alloc(idev, addr, false);
843 if (IS_ERR(rt)) {
844 err = PTR_ERR(rt);
845 goto out;
846 }
847
848 ifa->addr = *addr;
849 if (peer_addr)
850 ifa->peer_addr = *peer_addr;
851
852 spin_lock_init(&ifa->lock);
853 spin_lock_init(&ifa->state_lock);
854 setup_timer(&ifa->dad_timer, addrconf_dad_timer,
855 (unsigned long)ifa);
856 INIT_HLIST_NODE(&ifa->addr_lst);
857 ifa->scope = scope;
858 ifa->prefix_len = pfxlen;
859 ifa->flags = flags | IFA_F_TENTATIVE;
860 ifa->valid_lft = valid_lft;
861 ifa->prefered_lft = prefered_lft;
862 ifa->cstamp = ifa->tstamp = jiffies;
863 ifa->tokenized = false;
864
865 ifa->rt = rt;
866
867 ifa->idev = idev;
868 in6_dev_hold(idev);
869 /* For caller */
870 in6_ifa_hold(ifa);
871
872 /* Add to big hash table */
873 hash = inet6_addr_hash(addr);
874
875 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
876 spin_unlock(&addrconf_hash_lock);
877
878 write_lock(&idev->lock);
879 /* Add to inet6_dev unicast addr list. */
880 ipv6_link_dev_addr(idev, ifa);
881
882 #ifdef CONFIG_IPV6_PRIVACY
883 if (ifa->flags&IFA_F_TEMPORARY) {
884 list_add(&ifa->tmp_list, &idev->tempaddr_list);
885 in6_ifa_hold(ifa);
886 }
887 #endif
888
889 in6_ifa_hold(ifa);
890 write_unlock(&idev->lock);
891 out2:
892 rcu_read_unlock_bh();
893
894 if (likely(err == 0))
895 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
896 else {
897 kfree(ifa);
898 ifa = ERR_PTR(err);
899 }
900
901 return ifa;
902 out:
903 spin_unlock(&addrconf_hash_lock);
904 goto out2;
905 }
906
907 /* This function wants to get referenced ifp and releases it before return */
908
909 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
910 {
911 struct inet6_ifaddr *ifa, *ifn;
912 struct inet6_dev *idev = ifp->idev;
913 int state;
914 int deleted = 0, onlink = 0;
915 unsigned long expires = jiffies;
916
917 spin_lock_bh(&ifp->state_lock);
918 state = ifp->state;
919 ifp->state = INET6_IFADDR_STATE_DEAD;
920 spin_unlock_bh(&ifp->state_lock);
921
922 if (state == INET6_IFADDR_STATE_DEAD)
923 goto out;
924
925 spin_lock_bh(&addrconf_hash_lock);
926 hlist_del_init_rcu(&ifp->addr_lst);
927 spin_unlock_bh(&addrconf_hash_lock);
928
929 write_lock_bh(&idev->lock);
930 #ifdef CONFIG_IPV6_PRIVACY
931 if (ifp->flags&IFA_F_TEMPORARY) {
932 list_del(&ifp->tmp_list);
933 if (ifp->ifpub) {
934 in6_ifa_put(ifp->ifpub);
935 ifp->ifpub = NULL;
936 }
937 __in6_ifa_put(ifp);
938 }
939 #endif
940
941 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
942 if (ifa == ifp) {
943 list_del_init(&ifp->if_list);
944 __in6_ifa_put(ifp);
945
946 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
947 break;
948 deleted = 1;
949 continue;
950 } else if (ifp->flags & IFA_F_PERMANENT) {
951 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
952 ifp->prefix_len)) {
953 if (ifa->flags & IFA_F_PERMANENT) {
954 onlink = 1;
955 if (deleted)
956 break;
957 } else {
958 unsigned long lifetime;
959
960 if (!onlink)
961 onlink = -1;
962
963 spin_lock(&ifa->lock);
964
965 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
966 /*
967 * Note: Because this address is
968 * not permanent, lifetime <
969 * LONG_MAX / HZ here.
970 */
971 if (time_before(expires,
972 ifa->tstamp + lifetime * HZ))
973 expires = ifa->tstamp + lifetime * HZ;
974 spin_unlock(&ifa->lock);
975 }
976 }
977 }
978 }
979 write_unlock_bh(&idev->lock);
980
981 addrconf_del_dad_timer(ifp);
982
983 ipv6_ifa_notify(RTM_DELADDR, ifp);
984
985 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
986
987 /*
988 * Purge or update corresponding prefix
989 *
990 * 1) we don't purge prefix here if address was not permanent.
991 * prefix is managed by its own lifetime.
992 * 2) if there're no addresses, delete prefix.
993 * 3) if there're still other permanent address(es),
994 * corresponding prefix is still permanent.
995 * 4) otherwise, update prefix lifetime to the
996 * longest valid lifetime among the corresponding
997 * addresses on the device.
998 * Note: subsequent RA will update lifetime.
999 *
1000 * --yoshfuji
1001 */
1002 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
1003 struct in6_addr prefix;
1004 struct rt6_info *rt;
1005
1006 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1007
1008 rt = addrconf_get_prefix_route(&prefix,
1009 ifp->prefix_len,
1010 ifp->idev->dev,
1011 0, RTF_GATEWAY | RTF_DEFAULT);
1012
1013 if (rt) {
1014 if (onlink == 0) {
1015 ip6_del_rt(rt);
1016 rt = NULL;
1017 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1018 rt6_set_expires(rt, expires);
1019 }
1020 }
1021 ip6_rt_put(rt);
1022 }
1023
1024 /* clean up prefsrc entries */
1025 rt6_remove_prefsrc(ifp);
1026 out:
1027 in6_ifa_put(ifp);
1028 }
1029
1030 #ifdef CONFIG_IPV6_PRIVACY
1031 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1032 {
1033 struct inet6_dev *idev = ifp->idev;
1034 struct in6_addr addr, *tmpaddr;
1035 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1036 unsigned long regen_advance;
1037 int tmp_plen;
1038 int ret = 0;
1039 u32 addr_flags;
1040 unsigned long now = jiffies;
1041
1042 write_lock(&idev->lock);
1043 if (ift) {
1044 spin_lock_bh(&ift->lock);
1045 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1046 spin_unlock_bh(&ift->lock);
1047 tmpaddr = &addr;
1048 } else {
1049 tmpaddr = NULL;
1050 }
1051 retry:
1052 in6_dev_hold(idev);
1053 if (idev->cnf.use_tempaddr <= 0) {
1054 write_unlock(&idev->lock);
1055 pr_info("%s: use_tempaddr is disabled\n", __func__);
1056 in6_dev_put(idev);
1057 ret = -1;
1058 goto out;
1059 }
1060 spin_lock_bh(&ifp->lock);
1061 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1062 idev->cnf.use_tempaddr = -1; /*XXX*/
1063 spin_unlock_bh(&ifp->lock);
1064 write_unlock(&idev->lock);
1065 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1066 __func__);
1067 in6_dev_put(idev);
1068 ret = -1;
1069 goto out;
1070 }
1071 in6_ifa_hold(ifp);
1072 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1073 __ipv6_try_regen_rndid(idev, tmpaddr);
1074 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1075 age = (now - ifp->tstamp) / HZ;
1076 tmp_valid_lft = min_t(__u32,
1077 ifp->valid_lft,
1078 idev->cnf.temp_valid_lft + age);
1079 tmp_prefered_lft = min_t(__u32,
1080 ifp->prefered_lft,
1081 idev->cnf.temp_prefered_lft + age -
1082 idev->cnf.max_desync_factor);
1083 tmp_plen = ifp->prefix_len;
1084 tmp_tstamp = ifp->tstamp;
1085 spin_unlock_bh(&ifp->lock);
1086
1087 regen_advance = idev->cnf.regen_max_retry *
1088 idev->cnf.dad_transmits *
1089 idev->nd_parms->retrans_time / HZ;
1090 write_unlock(&idev->lock);
1091
1092 /* A temporary address is created only if this calculated Preferred
1093 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1094 * an implementation must not create a temporary address with a zero
1095 * Preferred Lifetime.
1096 */
1097 if (tmp_prefered_lft <= regen_advance) {
1098 in6_ifa_put(ifp);
1099 in6_dev_put(idev);
1100 ret = -1;
1101 goto out;
1102 }
1103
1104 addr_flags = IFA_F_TEMPORARY;
1105 /* set in addrconf_prefix_rcv() */
1106 if (ifp->flags & IFA_F_OPTIMISTIC)
1107 addr_flags |= IFA_F_OPTIMISTIC;
1108
1109 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1110 ipv6_addr_scope(&addr), addr_flags,
1111 tmp_valid_lft, tmp_prefered_lft);
1112 if (IS_ERR(ift)) {
1113 in6_ifa_put(ifp);
1114 in6_dev_put(idev);
1115 pr_info("%s: retry temporary address regeneration\n", __func__);
1116 tmpaddr = &addr;
1117 write_lock(&idev->lock);
1118 goto retry;
1119 }
1120
1121 spin_lock_bh(&ift->lock);
1122 ift->ifpub = ifp;
1123 ift->cstamp = now;
1124 ift->tstamp = tmp_tstamp;
1125 spin_unlock_bh(&ift->lock);
1126
1127 addrconf_dad_start(ift);
1128 in6_ifa_put(ift);
1129 in6_dev_put(idev);
1130 out:
1131 return ret;
1132 }
1133 #endif
1134
1135 /*
1136 * Choose an appropriate source address (RFC3484)
1137 */
1138 enum {
1139 IPV6_SADDR_RULE_INIT = 0,
1140 IPV6_SADDR_RULE_LOCAL,
1141 IPV6_SADDR_RULE_SCOPE,
1142 IPV6_SADDR_RULE_PREFERRED,
1143 #ifdef CONFIG_IPV6_MIP6
1144 IPV6_SADDR_RULE_HOA,
1145 #endif
1146 IPV6_SADDR_RULE_OIF,
1147 IPV6_SADDR_RULE_LABEL,
1148 #ifdef CONFIG_IPV6_PRIVACY
1149 IPV6_SADDR_RULE_PRIVACY,
1150 #endif
1151 IPV6_SADDR_RULE_ORCHID,
1152 IPV6_SADDR_RULE_PREFIX,
1153 IPV6_SADDR_RULE_MAX
1154 };
1155
1156 struct ipv6_saddr_score {
1157 int rule;
1158 int addr_type;
1159 struct inet6_ifaddr *ifa;
1160 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1161 int scopedist;
1162 int matchlen;
1163 };
1164
1165 struct ipv6_saddr_dst {
1166 const struct in6_addr *addr;
1167 int ifindex;
1168 int scope;
1169 int label;
1170 unsigned int prefs;
1171 };
1172
1173 static inline int ipv6_saddr_preferred(int type)
1174 {
1175 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1176 return 1;
1177 return 0;
1178 }
1179
1180 static int ipv6_get_saddr_eval(struct net *net,
1181 struct ipv6_saddr_score *score,
1182 struct ipv6_saddr_dst *dst,
1183 int i)
1184 {
1185 int ret;
1186
1187 if (i <= score->rule) {
1188 switch (i) {
1189 case IPV6_SADDR_RULE_SCOPE:
1190 ret = score->scopedist;
1191 break;
1192 case IPV6_SADDR_RULE_PREFIX:
1193 ret = score->matchlen;
1194 break;
1195 default:
1196 ret = !!test_bit(i, score->scorebits);
1197 }
1198 goto out;
1199 }
1200
1201 switch (i) {
1202 case IPV6_SADDR_RULE_INIT:
1203 /* Rule 0: remember if hiscore is not ready yet */
1204 ret = !!score->ifa;
1205 break;
1206 case IPV6_SADDR_RULE_LOCAL:
1207 /* Rule 1: Prefer same address */
1208 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1209 break;
1210 case IPV6_SADDR_RULE_SCOPE:
1211 /* Rule 2: Prefer appropriate scope
1212 *
1213 * ret
1214 * ^
1215 * -1 | d 15
1216 * ---+--+-+---> scope
1217 * |
1218 * | d is scope of the destination.
1219 * B-d | \
1220 * | \ <- smaller scope is better if
1221 * B-15 | \ if scope is enough for destinaion.
1222 * | ret = B - scope (-1 <= scope >= d <= 15).
1223 * d-C-1 | /
1224 * |/ <- greater is better
1225 * -C / if scope is not enough for destination.
1226 * /| ret = scope - C (-1 <= d < scope <= 15).
1227 *
1228 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1229 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1230 * Assume B = 0 and we get C > 29.
1231 */
1232 ret = __ipv6_addr_src_scope(score->addr_type);
1233 if (ret >= dst->scope)
1234 ret = -ret;
1235 else
1236 ret -= 128; /* 30 is enough */
1237 score->scopedist = ret;
1238 break;
1239 case IPV6_SADDR_RULE_PREFERRED:
1240 /* Rule 3: Avoid deprecated and optimistic addresses */
1241 ret = ipv6_saddr_preferred(score->addr_type) ||
1242 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1243 break;
1244 #ifdef CONFIG_IPV6_MIP6
1245 case IPV6_SADDR_RULE_HOA:
1246 {
1247 /* Rule 4: Prefer home address */
1248 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1249 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1250 break;
1251 }
1252 #endif
1253 case IPV6_SADDR_RULE_OIF:
1254 /* Rule 5: Prefer outgoing interface */
1255 ret = (!dst->ifindex ||
1256 dst->ifindex == score->ifa->idev->dev->ifindex);
1257 break;
1258 case IPV6_SADDR_RULE_LABEL:
1259 /* Rule 6: Prefer matching label */
1260 ret = ipv6_addr_label(net,
1261 &score->ifa->addr, score->addr_type,
1262 score->ifa->idev->dev->ifindex) == dst->label;
1263 break;
1264 #ifdef CONFIG_IPV6_PRIVACY
1265 case IPV6_SADDR_RULE_PRIVACY:
1266 {
1267 /* Rule 7: Prefer public address
1268 * Note: prefer temporary address if use_tempaddr >= 2
1269 */
1270 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1271 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1272 score->ifa->idev->cnf.use_tempaddr >= 2;
1273 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1274 break;
1275 }
1276 #endif
1277 case IPV6_SADDR_RULE_ORCHID:
1278 /* Rule 8-: Prefer ORCHID vs ORCHID or
1279 * non-ORCHID vs non-ORCHID
1280 */
1281 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1282 ipv6_addr_orchid(dst->addr));
1283 break;
1284 case IPV6_SADDR_RULE_PREFIX:
1285 /* Rule 8: Use longest matching prefix */
1286 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1287 if (ret > score->ifa->prefix_len)
1288 ret = score->ifa->prefix_len;
1289 score->matchlen = ret;
1290 break;
1291 default:
1292 ret = 0;
1293 }
1294
1295 if (ret)
1296 __set_bit(i, score->scorebits);
1297 score->rule = i;
1298 out:
1299 return ret;
1300 }
1301
1302 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1303 const struct in6_addr *daddr, unsigned int prefs,
1304 struct in6_addr *saddr)
1305 {
1306 struct ipv6_saddr_score scores[2],
1307 *score = &scores[0], *hiscore = &scores[1];
1308 struct ipv6_saddr_dst dst;
1309 struct net_device *dev;
1310 int dst_type;
1311
1312 dst_type = __ipv6_addr_type(daddr);
1313 dst.addr = daddr;
1314 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1315 dst.scope = __ipv6_addr_src_scope(dst_type);
1316 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1317 dst.prefs = prefs;
1318
1319 hiscore->rule = -1;
1320 hiscore->ifa = NULL;
1321
1322 rcu_read_lock();
1323
1324 for_each_netdev_rcu(net, dev) {
1325 struct inet6_dev *idev;
1326
1327 /* Candidate Source Address (section 4)
1328 * - multicast and link-local destination address,
1329 * the set of candidate source address MUST only
1330 * include addresses assigned to interfaces
1331 * belonging to the same link as the outgoing
1332 * interface.
1333 * (- For site-local destination addresses, the
1334 * set of candidate source addresses MUST only
1335 * include addresses assigned to interfaces
1336 * belonging to the same site as the outgoing
1337 * interface.)
1338 */
1339 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1340 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1341 dst.ifindex && dev->ifindex != dst.ifindex)
1342 continue;
1343
1344 idev = __in6_dev_get(dev);
1345 if (!idev)
1346 continue;
1347
1348 read_lock_bh(&idev->lock);
1349 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1350 int i;
1351
1352 /*
1353 * - Tentative Address (RFC2462 section 5.4)
1354 * - A tentative address is not considered
1355 * "assigned to an interface" in the traditional
1356 * sense, unless it is also flagged as optimistic.
1357 * - Candidate Source Address (section 4)
1358 * - In any case, anycast addresses, multicast
1359 * addresses, and the unspecified address MUST
1360 * NOT be included in a candidate set.
1361 */
1362 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1363 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1364 continue;
1365
1366 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1367
1368 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1369 score->addr_type & IPV6_ADDR_MULTICAST)) {
1370 LIMIT_NETDEBUG(KERN_DEBUG
1371 "ADDRCONF: unspecified / multicast address "
1372 "assigned as unicast address on %s",
1373 dev->name);
1374 continue;
1375 }
1376
1377 score->rule = -1;
1378 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1379
1380 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1381 int minihiscore, miniscore;
1382
1383 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1384 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1385
1386 if (minihiscore > miniscore) {
1387 if (i == IPV6_SADDR_RULE_SCOPE &&
1388 score->scopedist > 0) {
1389 /*
1390 * special case:
1391 * each remaining entry
1392 * has too small (not enough)
1393 * scope, because ifa entries
1394 * are sorted by their scope
1395 * values.
1396 */
1397 goto try_nextdev;
1398 }
1399 break;
1400 } else if (minihiscore < miniscore) {
1401 if (hiscore->ifa)
1402 in6_ifa_put(hiscore->ifa);
1403
1404 in6_ifa_hold(score->ifa);
1405
1406 swap(hiscore, score);
1407
1408 /* restore our iterator */
1409 score->ifa = hiscore->ifa;
1410
1411 break;
1412 }
1413 }
1414 }
1415 try_nextdev:
1416 read_unlock_bh(&idev->lock);
1417 }
1418 rcu_read_unlock();
1419
1420 if (!hiscore->ifa)
1421 return -EADDRNOTAVAIL;
1422
1423 *saddr = hiscore->ifa->addr;
1424 in6_ifa_put(hiscore->ifa);
1425 return 0;
1426 }
1427 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1428
1429 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1430 unsigned char banned_flags)
1431 {
1432 struct inet6_ifaddr *ifp;
1433 int err = -EADDRNOTAVAIL;
1434
1435 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1436 if (ifp->scope == IFA_LINK &&
1437 !(ifp->flags & banned_flags)) {
1438 *addr = ifp->addr;
1439 err = 0;
1440 break;
1441 }
1442 }
1443 return err;
1444 }
1445
1446 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1447 unsigned char banned_flags)
1448 {
1449 struct inet6_dev *idev;
1450 int err = -EADDRNOTAVAIL;
1451
1452 rcu_read_lock();
1453 idev = __in6_dev_get(dev);
1454 if (idev) {
1455 read_lock_bh(&idev->lock);
1456 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1457 read_unlock_bh(&idev->lock);
1458 }
1459 rcu_read_unlock();
1460 return err;
1461 }
1462
1463 static int ipv6_count_addresses(struct inet6_dev *idev)
1464 {
1465 int cnt = 0;
1466 struct inet6_ifaddr *ifp;
1467
1468 read_lock_bh(&idev->lock);
1469 list_for_each_entry(ifp, &idev->addr_list, if_list)
1470 cnt++;
1471 read_unlock_bh(&idev->lock);
1472 return cnt;
1473 }
1474
1475 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1476 const struct net_device *dev, int strict)
1477 {
1478 struct inet6_ifaddr *ifp;
1479 unsigned int hash = inet6_addr_hash(addr);
1480
1481 rcu_read_lock_bh();
1482 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1483 if (!net_eq(dev_net(ifp->idev->dev), net))
1484 continue;
1485 if (ipv6_addr_equal(&ifp->addr, addr) &&
1486 !(ifp->flags&IFA_F_TENTATIVE) &&
1487 (dev == NULL || ifp->idev->dev == dev ||
1488 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1489 rcu_read_unlock_bh();
1490 return 1;
1491 }
1492 }
1493
1494 rcu_read_unlock_bh();
1495 return 0;
1496 }
1497 EXPORT_SYMBOL(ipv6_chk_addr);
1498
1499 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1500 struct net_device *dev)
1501 {
1502 unsigned int hash = inet6_addr_hash(addr);
1503 struct inet6_ifaddr *ifp;
1504
1505 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1506 if (!net_eq(dev_net(ifp->idev->dev), net))
1507 continue;
1508 if (ipv6_addr_equal(&ifp->addr, addr)) {
1509 if (dev == NULL || ifp->idev->dev == dev)
1510 return true;
1511 }
1512 }
1513 return false;
1514 }
1515
1516 /* Compares an address/prefix_len with addresses on device @dev.
1517 * If one is found it returns true.
1518 */
1519 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1520 const unsigned int prefix_len, struct net_device *dev)
1521 {
1522 struct inet6_dev *idev;
1523 struct inet6_ifaddr *ifa;
1524 bool ret = false;
1525
1526 rcu_read_lock();
1527 idev = __in6_dev_get(dev);
1528 if (idev) {
1529 read_lock_bh(&idev->lock);
1530 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1531 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1532 if (ret)
1533 break;
1534 }
1535 read_unlock_bh(&idev->lock);
1536 }
1537 rcu_read_unlock();
1538
1539 return ret;
1540 }
1541 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1542
1543 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1544 {
1545 struct inet6_dev *idev;
1546 struct inet6_ifaddr *ifa;
1547 int onlink;
1548
1549 onlink = 0;
1550 rcu_read_lock();
1551 idev = __in6_dev_get(dev);
1552 if (idev) {
1553 read_lock_bh(&idev->lock);
1554 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1555 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1556 ifa->prefix_len);
1557 if (onlink)
1558 break;
1559 }
1560 read_unlock_bh(&idev->lock);
1561 }
1562 rcu_read_unlock();
1563 return onlink;
1564 }
1565 EXPORT_SYMBOL(ipv6_chk_prefix);
1566
1567 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1568 struct net_device *dev, int strict)
1569 {
1570 struct inet6_ifaddr *ifp, *result = NULL;
1571 unsigned int hash = inet6_addr_hash(addr);
1572
1573 rcu_read_lock_bh();
1574 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1575 if (!net_eq(dev_net(ifp->idev->dev), net))
1576 continue;
1577 if (ipv6_addr_equal(&ifp->addr, addr)) {
1578 if (dev == NULL || ifp->idev->dev == dev ||
1579 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1580 result = ifp;
1581 in6_ifa_hold(ifp);
1582 break;
1583 }
1584 }
1585 }
1586 rcu_read_unlock_bh();
1587
1588 return result;
1589 }
1590
1591 /* Gets referenced address, destroys ifaddr */
1592
1593 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1594 {
1595 if (ifp->flags&IFA_F_PERMANENT) {
1596 spin_lock_bh(&ifp->lock);
1597 addrconf_del_dad_timer(ifp);
1598 ifp->flags |= IFA_F_TENTATIVE;
1599 if (dad_failed)
1600 ifp->flags |= IFA_F_DADFAILED;
1601 spin_unlock_bh(&ifp->lock);
1602 if (dad_failed)
1603 ipv6_ifa_notify(0, ifp);
1604 in6_ifa_put(ifp);
1605 #ifdef CONFIG_IPV6_PRIVACY
1606 } else if (ifp->flags&IFA_F_TEMPORARY) {
1607 struct inet6_ifaddr *ifpub;
1608 spin_lock_bh(&ifp->lock);
1609 ifpub = ifp->ifpub;
1610 if (ifpub) {
1611 in6_ifa_hold(ifpub);
1612 spin_unlock_bh(&ifp->lock);
1613 ipv6_create_tempaddr(ifpub, ifp);
1614 in6_ifa_put(ifpub);
1615 } else {
1616 spin_unlock_bh(&ifp->lock);
1617 }
1618 ipv6_del_addr(ifp);
1619 #endif
1620 } else
1621 ipv6_del_addr(ifp);
1622 }
1623
1624 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1625 {
1626 int err = -ENOENT;
1627
1628 spin_lock(&ifp->state_lock);
1629 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1630 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1631 err = 0;
1632 }
1633 spin_unlock(&ifp->state_lock);
1634
1635 return err;
1636 }
1637
1638 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1639 {
1640 struct inet6_dev *idev = ifp->idev;
1641
1642 if (addrconf_dad_end(ifp)) {
1643 in6_ifa_put(ifp);
1644 return;
1645 }
1646
1647 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1648 ifp->idev->dev->name, &ifp->addr);
1649
1650 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1651 struct in6_addr addr;
1652
1653 addr.s6_addr32[0] = htonl(0xfe800000);
1654 addr.s6_addr32[1] = 0;
1655
1656 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1657 ipv6_addr_equal(&ifp->addr, &addr)) {
1658 /* DAD failed for link-local based on MAC address */
1659 idev->cnf.disable_ipv6 = 1;
1660
1661 pr_info("%s: IPv6 being disabled!\n",
1662 ifp->idev->dev->name);
1663 }
1664 }
1665
1666 addrconf_dad_stop(ifp, 1);
1667 }
1668
1669 /* Join to solicited addr multicast group. */
1670
1671 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1672 {
1673 struct in6_addr maddr;
1674
1675 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1676 return;
1677
1678 addrconf_addr_solict_mult(addr, &maddr);
1679 ipv6_dev_mc_inc(dev, &maddr);
1680 }
1681
1682 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1683 {
1684 struct in6_addr maddr;
1685
1686 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1687 return;
1688
1689 addrconf_addr_solict_mult(addr, &maddr);
1690 __ipv6_dev_mc_dec(idev, &maddr);
1691 }
1692
1693 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1694 {
1695 struct in6_addr addr;
1696 if (ifp->prefix_len == 127) /* RFC 6164 */
1697 return;
1698 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1699 if (ipv6_addr_any(&addr))
1700 return;
1701 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1702 }
1703
1704 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1705 {
1706 struct in6_addr addr;
1707 if (ifp->prefix_len == 127) /* RFC 6164 */
1708 return;
1709 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1710 if (ipv6_addr_any(&addr))
1711 return;
1712 __ipv6_dev_ac_dec(ifp->idev, &addr);
1713 }
1714
1715 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1716 {
1717 if (dev->addr_len != ETH_ALEN)
1718 return -1;
1719 memcpy(eui, dev->dev_addr, 3);
1720 memcpy(eui + 5, dev->dev_addr + 3, 3);
1721
1722 /*
1723 * The zSeries OSA network cards can be shared among various
1724 * OS instances, but the OSA cards have only one MAC address.
1725 * This leads to duplicate address conflicts in conjunction
1726 * with IPv6 if more than one instance uses the same card.
1727 *
1728 * The driver for these cards can deliver a unique 16-bit
1729 * identifier for each instance sharing the same card. It is
1730 * placed instead of 0xFFFE in the interface identifier. The
1731 * "u" bit of the interface identifier is not inverted in this
1732 * case. Hence the resulting interface identifier has local
1733 * scope according to RFC2373.
1734 */
1735 if (dev->dev_id) {
1736 eui[3] = (dev->dev_id >> 8) & 0xFF;
1737 eui[4] = dev->dev_id & 0xFF;
1738 } else {
1739 eui[3] = 0xFF;
1740 eui[4] = 0xFE;
1741 eui[0] ^= 2;
1742 }
1743 return 0;
1744 }
1745
1746 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1747 {
1748 if (dev->addr_len != IEEE802154_ADDR_LEN)
1749 return -1;
1750 memcpy(eui, dev->dev_addr, 8);
1751 eui[0] ^= 2;
1752 return 0;
1753 }
1754
1755 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1756 {
1757 union fwnet_hwaddr *ha;
1758
1759 if (dev->addr_len != FWNET_ALEN)
1760 return -1;
1761
1762 ha = (union fwnet_hwaddr *)dev->dev_addr;
1763
1764 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1765 eui[0] ^= 2;
1766 return 0;
1767 }
1768
1769 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1770 {
1771 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1772 if (dev->addr_len != ARCNET_ALEN)
1773 return -1;
1774 memset(eui, 0, 7);
1775 eui[7] = *(u8 *)dev->dev_addr;
1776 return 0;
1777 }
1778
1779 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1780 {
1781 if (dev->addr_len != INFINIBAND_ALEN)
1782 return -1;
1783 memcpy(eui, dev->dev_addr + 12, 8);
1784 eui[0] |= 2;
1785 return 0;
1786 }
1787
1788 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1789 {
1790 if (addr == 0)
1791 return -1;
1792 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1793 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1794 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1795 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1796 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1797 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1798 eui[1] = 0;
1799 eui[2] = 0x5E;
1800 eui[3] = 0xFE;
1801 memcpy(eui + 4, &addr, 4);
1802 return 0;
1803 }
1804
1805 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1806 {
1807 if (dev->priv_flags & IFF_ISATAP)
1808 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1809 return -1;
1810 }
1811
1812 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1813 {
1814 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1815 }
1816
1817 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1818 {
1819 memcpy(eui, dev->perm_addr, 3);
1820 memcpy(eui + 5, dev->perm_addr + 3, 3);
1821 eui[3] = 0xFF;
1822 eui[4] = 0xFE;
1823 eui[0] ^= 2;
1824 return 0;
1825 }
1826
1827 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1828 {
1829 switch (dev->type) {
1830 case ARPHRD_ETHER:
1831 case ARPHRD_FDDI:
1832 return addrconf_ifid_eui48(eui, dev);
1833 case ARPHRD_ARCNET:
1834 return addrconf_ifid_arcnet(eui, dev);
1835 case ARPHRD_INFINIBAND:
1836 return addrconf_ifid_infiniband(eui, dev);
1837 case ARPHRD_SIT:
1838 return addrconf_ifid_sit(eui, dev);
1839 case ARPHRD_IPGRE:
1840 return addrconf_ifid_gre(eui, dev);
1841 case ARPHRD_IEEE802154:
1842 return addrconf_ifid_eui64(eui, dev);
1843 case ARPHRD_IEEE1394:
1844 return addrconf_ifid_ieee1394(eui, dev);
1845 case ARPHRD_TUNNEL6:
1846 return addrconf_ifid_ip6tnl(eui, dev);
1847 }
1848 return -1;
1849 }
1850
1851 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1852 {
1853 int err = -1;
1854 struct inet6_ifaddr *ifp;
1855
1856 read_lock_bh(&idev->lock);
1857 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1858 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1859 memcpy(eui, ifp->addr.s6_addr+8, 8);
1860 err = 0;
1861 break;
1862 }
1863 }
1864 read_unlock_bh(&idev->lock);
1865 return err;
1866 }
1867
1868 #ifdef CONFIG_IPV6_PRIVACY
1869 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1870 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1871 {
1872 regen:
1873 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1874 idev->rndid[0] &= ~0x02;
1875
1876 /*
1877 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1878 * check if generated address is not inappropriate
1879 *
1880 * - Reserved subnet anycast (RFC 2526)
1881 * 11111101 11....11 1xxxxxxx
1882 * - ISATAP (RFC4214) 6.1
1883 * 00-00-5E-FE-xx-xx-xx-xx
1884 * - value 0
1885 * - XXX: already assigned to an address on the device
1886 */
1887 if (idev->rndid[0] == 0xfd &&
1888 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1889 (idev->rndid[7]&0x80))
1890 goto regen;
1891 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1892 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1893 goto regen;
1894 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1895 goto regen;
1896 }
1897 }
1898
1899 static void ipv6_regen_rndid(unsigned long data)
1900 {
1901 struct inet6_dev *idev = (struct inet6_dev *) data;
1902 unsigned long expires;
1903
1904 rcu_read_lock_bh();
1905 write_lock_bh(&idev->lock);
1906
1907 if (idev->dead)
1908 goto out;
1909
1910 __ipv6_regen_rndid(idev);
1911
1912 expires = jiffies +
1913 idev->cnf.temp_prefered_lft * HZ -
1914 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1915 idev->cnf.max_desync_factor * HZ;
1916 if (time_before(expires, jiffies)) {
1917 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1918 __func__, idev->dev->name);
1919 goto out;
1920 }
1921
1922 if (!mod_timer(&idev->regen_timer, expires))
1923 in6_dev_hold(idev);
1924
1925 out:
1926 write_unlock_bh(&idev->lock);
1927 rcu_read_unlock_bh();
1928 in6_dev_put(idev);
1929 }
1930
1931 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1932 {
1933 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1934 __ipv6_regen_rndid(idev);
1935 }
1936 #endif
1937
1938 /*
1939 * Add prefix route.
1940 */
1941
1942 static void
1943 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1944 unsigned long expires, u32 flags)
1945 {
1946 struct fib6_config cfg = {
1947 .fc_table = RT6_TABLE_PREFIX,
1948 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1949 .fc_ifindex = dev->ifindex,
1950 .fc_expires = expires,
1951 .fc_dst_len = plen,
1952 .fc_flags = RTF_UP | flags,
1953 .fc_nlinfo.nl_net = dev_net(dev),
1954 .fc_protocol = RTPROT_KERNEL,
1955 };
1956
1957 cfg.fc_dst = *pfx;
1958
1959 /* Prevent useless cloning on PtP SIT.
1960 This thing is done here expecting that the whole
1961 class of non-broadcast devices need not cloning.
1962 */
1963 #if IS_ENABLED(CONFIG_IPV6_SIT)
1964 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1965 cfg.fc_flags |= RTF_NONEXTHOP;
1966 #endif
1967
1968 ip6_route_add(&cfg);
1969 }
1970
1971
1972 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1973 int plen,
1974 const struct net_device *dev,
1975 u32 flags, u32 noflags)
1976 {
1977 struct fib6_node *fn;
1978 struct rt6_info *rt = NULL;
1979 struct fib6_table *table;
1980
1981 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1982 if (table == NULL)
1983 return NULL;
1984
1985 read_lock_bh(&table->tb6_lock);
1986 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1987 if (!fn)
1988 goto out;
1989 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1990 if (rt->dst.dev->ifindex != dev->ifindex)
1991 continue;
1992 if ((rt->rt6i_flags & flags) != flags)
1993 continue;
1994 if ((rt->rt6i_flags & noflags) != 0)
1995 continue;
1996 dst_hold(&rt->dst);
1997 break;
1998 }
1999 out:
2000 read_unlock_bh(&table->tb6_lock);
2001 return rt;
2002 }
2003
2004
2005 /* Create "default" multicast route to the interface */
2006
2007 static void addrconf_add_mroute(struct net_device *dev)
2008 {
2009 struct fib6_config cfg = {
2010 .fc_table = RT6_TABLE_LOCAL,
2011 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2012 .fc_ifindex = dev->ifindex,
2013 .fc_dst_len = 8,
2014 .fc_flags = RTF_UP,
2015 .fc_nlinfo.nl_net = dev_net(dev),
2016 };
2017
2018 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2019
2020 ip6_route_add(&cfg);
2021 }
2022
2023 #if IS_ENABLED(CONFIG_IPV6_SIT)
2024 static void sit_route_add(struct net_device *dev)
2025 {
2026 struct fib6_config cfg = {
2027 .fc_table = RT6_TABLE_MAIN,
2028 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2029 .fc_ifindex = dev->ifindex,
2030 .fc_dst_len = 96,
2031 .fc_flags = RTF_UP | RTF_NONEXTHOP,
2032 .fc_nlinfo.nl_net = dev_net(dev),
2033 };
2034
2035 /* prefix length - 96 bits "::d.d.d.d" */
2036 ip6_route_add(&cfg);
2037 }
2038 #endif
2039
2040 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2041 {
2042 struct inet6_dev *idev;
2043
2044 ASSERT_RTNL();
2045
2046 idev = ipv6_find_idev(dev);
2047 if (!idev)
2048 return ERR_PTR(-ENOBUFS);
2049
2050 if (idev->cnf.disable_ipv6)
2051 return ERR_PTR(-EACCES);
2052
2053 /* Add default multicast route */
2054 if (!(dev->flags & IFF_LOOPBACK))
2055 addrconf_add_mroute(dev);
2056
2057 return idev;
2058 }
2059
2060 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2061 {
2062 struct prefix_info *pinfo;
2063 __u32 valid_lft;
2064 __u32 prefered_lft;
2065 int addr_type;
2066 struct inet6_dev *in6_dev;
2067 struct net *net = dev_net(dev);
2068
2069 pinfo = (struct prefix_info *) opt;
2070
2071 if (len < sizeof(struct prefix_info)) {
2072 ADBG("addrconf: prefix option too short\n");
2073 return;
2074 }
2075
2076 /*
2077 * Validation checks ([ADDRCONF], page 19)
2078 */
2079
2080 addr_type = ipv6_addr_type(&pinfo->prefix);
2081
2082 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2083 return;
2084
2085 valid_lft = ntohl(pinfo->valid);
2086 prefered_lft = ntohl(pinfo->prefered);
2087
2088 if (prefered_lft > valid_lft) {
2089 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2090 return;
2091 }
2092
2093 in6_dev = in6_dev_get(dev);
2094
2095 if (in6_dev == NULL) {
2096 net_dbg_ratelimited("addrconf: device %s not configured\n",
2097 dev->name);
2098 return;
2099 }
2100
2101 /*
2102 * Two things going on here:
2103 * 1) Add routes for on-link prefixes
2104 * 2) Configure prefixes with the auto flag set
2105 */
2106
2107 if (pinfo->onlink) {
2108 struct rt6_info *rt;
2109 unsigned long rt_expires;
2110
2111 /* Avoid arithmetic overflow. Really, we could
2112 * save rt_expires in seconds, likely valid_lft,
2113 * but it would require division in fib gc, that it
2114 * not good.
2115 */
2116 if (HZ > USER_HZ)
2117 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2118 else
2119 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2120
2121 if (addrconf_finite_timeout(rt_expires))
2122 rt_expires *= HZ;
2123
2124 rt = addrconf_get_prefix_route(&pinfo->prefix,
2125 pinfo->prefix_len,
2126 dev,
2127 RTF_ADDRCONF | RTF_PREFIX_RT,
2128 RTF_GATEWAY | RTF_DEFAULT);
2129
2130 if (rt) {
2131 /* Autoconf prefix route */
2132 if (valid_lft == 0) {
2133 ip6_del_rt(rt);
2134 rt = NULL;
2135 } else if (addrconf_finite_timeout(rt_expires)) {
2136 /* not infinity */
2137 rt6_set_expires(rt, jiffies + rt_expires);
2138 } else {
2139 rt6_clean_expires(rt);
2140 }
2141 } else if (valid_lft) {
2142 clock_t expires = 0;
2143 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2144 if (addrconf_finite_timeout(rt_expires)) {
2145 /* not infinity */
2146 flags |= RTF_EXPIRES;
2147 expires = jiffies_to_clock_t(rt_expires);
2148 }
2149 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2150 dev, expires, flags);
2151 }
2152 ip6_rt_put(rt);
2153 }
2154
2155 /* Try to figure out our local address for this prefix */
2156
2157 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2158 struct inet6_ifaddr *ifp;
2159 struct in6_addr addr;
2160 int create = 0, update_lft = 0;
2161 bool tokenized = false;
2162
2163 if (pinfo->prefix_len == 64) {
2164 memcpy(&addr, &pinfo->prefix, 8);
2165
2166 if (!ipv6_addr_any(&in6_dev->token)) {
2167 read_lock_bh(&in6_dev->lock);
2168 memcpy(addr.s6_addr + 8,
2169 in6_dev->token.s6_addr + 8, 8);
2170 read_unlock_bh(&in6_dev->lock);
2171 tokenized = true;
2172 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2173 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2174 in6_dev_put(in6_dev);
2175 return;
2176 }
2177 goto ok;
2178 }
2179 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2180 pinfo->prefix_len);
2181 in6_dev_put(in6_dev);
2182 return;
2183
2184 ok:
2185
2186 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2187
2188 if (ifp == NULL && valid_lft) {
2189 int max_addresses = in6_dev->cnf.max_addresses;
2190 u32 addr_flags = 0;
2191
2192 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2193 if (in6_dev->cnf.optimistic_dad &&
2194 !net->ipv6.devconf_all->forwarding && sllao)
2195 addr_flags = IFA_F_OPTIMISTIC;
2196 #endif
2197
2198 /* Do not allow to create too much of autoconfigured
2199 * addresses; this would be too easy way to crash kernel.
2200 */
2201 if (!max_addresses ||
2202 ipv6_count_addresses(in6_dev) < max_addresses)
2203 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2204 pinfo->prefix_len,
2205 addr_type&IPV6_ADDR_SCOPE_MASK,
2206 addr_flags, valid_lft,
2207 prefered_lft);
2208
2209 if (IS_ERR_OR_NULL(ifp)) {
2210 in6_dev_put(in6_dev);
2211 return;
2212 }
2213
2214 update_lft = 0;
2215 create = 1;
2216 ifp->cstamp = jiffies;
2217 ifp->tokenized = tokenized;
2218 addrconf_dad_start(ifp);
2219 }
2220
2221 if (ifp) {
2222 int flags;
2223 unsigned long now;
2224 #ifdef CONFIG_IPV6_PRIVACY
2225 struct inet6_ifaddr *ift;
2226 #endif
2227 u32 stored_lft;
2228
2229 /* update lifetime (RFC2462 5.5.3 e) */
2230 spin_lock(&ifp->lock);
2231 now = jiffies;
2232 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2233 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2234 else
2235 stored_lft = 0;
2236 if (!update_lft && !create && stored_lft) {
2237 const u32 minimum_lft = min(
2238 stored_lft, (u32)MIN_VALID_LIFETIME);
2239 valid_lft = max(valid_lft, minimum_lft);
2240
2241 /* RFC4862 Section 5.5.3e:
2242 * "Note that the preferred lifetime of the
2243 * corresponding address is always reset to
2244 * the Preferred Lifetime in the received
2245 * Prefix Information option, regardless of
2246 * whether the valid lifetime is also reset or
2247 * ignored."
2248 *
2249 * So we should always update prefered_lft here.
2250 */
2251 update_lft = 1;
2252 }
2253
2254 if (update_lft) {
2255 ifp->valid_lft = valid_lft;
2256 ifp->prefered_lft = prefered_lft;
2257 ifp->tstamp = now;
2258 flags = ifp->flags;
2259 ifp->flags &= ~IFA_F_DEPRECATED;
2260 spin_unlock(&ifp->lock);
2261
2262 if (!(flags&IFA_F_TENTATIVE))
2263 ipv6_ifa_notify(0, ifp);
2264 } else
2265 spin_unlock(&ifp->lock);
2266
2267 #ifdef CONFIG_IPV6_PRIVACY
2268 read_lock_bh(&in6_dev->lock);
2269 /* update all temporary addresses in the list */
2270 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2271 tmp_list) {
2272 int age, max_valid, max_prefered;
2273
2274 if (ifp != ift->ifpub)
2275 continue;
2276
2277 /*
2278 * RFC 4941 section 3.3:
2279 * If a received option will extend the lifetime
2280 * of a public address, the lifetimes of
2281 * temporary addresses should be extended,
2282 * subject to the overall constraint that no
2283 * temporary addresses should ever remain
2284 * "valid" or "preferred" for a time longer than
2285 * (TEMP_VALID_LIFETIME) or
2286 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2287 * respectively.
2288 */
2289 age = (now - ift->cstamp) / HZ;
2290 max_valid = in6_dev->cnf.temp_valid_lft - age;
2291 if (max_valid < 0)
2292 max_valid = 0;
2293
2294 max_prefered = in6_dev->cnf.temp_prefered_lft -
2295 in6_dev->cnf.max_desync_factor -
2296 age;
2297 if (max_prefered < 0)
2298 max_prefered = 0;
2299
2300 if (valid_lft > max_valid)
2301 valid_lft = max_valid;
2302
2303 if (prefered_lft > max_prefered)
2304 prefered_lft = max_prefered;
2305
2306 spin_lock(&ift->lock);
2307 flags = ift->flags;
2308 ift->valid_lft = valid_lft;
2309 ift->prefered_lft = prefered_lft;
2310 ift->tstamp = now;
2311 if (prefered_lft > 0)
2312 ift->flags &= ~IFA_F_DEPRECATED;
2313
2314 spin_unlock(&ift->lock);
2315 if (!(flags&IFA_F_TENTATIVE))
2316 ipv6_ifa_notify(0, ift);
2317 }
2318
2319 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2320 /*
2321 * When a new public address is created as
2322 * described in [ADDRCONF], also create a new
2323 * temporary address. Also create a temporary
2324 * address if it's enabled but no temporary
2325 * address currently exists.
2326 */
2327 read_unlock_bh(&in6_dev->lock);
2328 ipv6_create_tempaddr(ifp, NULL);
2329 } else {
2330 read_unlock_bh(&in6_dev->lock);
2331 }
2332 #endif
2333 in6_ifa_put(ifp);
2334 addrconf_verify(0);
2335 }
2336 }
2337 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2338 in6_dev_put(in6_dev);
2339 }
2340
2341 /*
2342 * Set destination address.
2343 * Special case for SIT interfaces where we create a new "virtual"
2344 * device.
2345 */
2346 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2347 {
2348 struct in6_ifreq ireq;
2349 struct net_device *dev;
2350 int err = -EINVAL;
2351
2352 rtnl_lock();
2353
2354 err = -EFAULT;
2355 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2356 goto err_exit;
2357
2358 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2359
2360 err = -ENODEV;
2361 if (dev == NULL)
2362 goto err_exit;
2363
2364 #if IS_ENABLED(CONFIG_IPV6_SIT)
2365 if (dev->type == ARPHRD_SIT) {
2366 const struct net_device_ops *ops = dev->netdev_ops;
2367 struct ifreq ifr;
2368 struct ip_tunnel_parm p;
2369
2370 err = -EADDRNOTAVAIL;
2371 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2372 goto err_exit;
2373
2374 memset(&p, 0, sizeof(p));
2375 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2376 p.iph.saddr = 0;
2377 p.iph.version = 4;
2378 p.iph.ihl = 5;
2379 p.iph.protocol = IPPROTO_IPV6;
2380 p.iph.ttl = 64;
2381 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2382
2383 if (ops->ndo_do_ioctl) {
2384 mm_segment_t oldfs = get_fs();
2385
2386 set_fs(KERNEL_DS);
2387 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2388 set_fs(oldfs);
2389 } else
2390 err = -EOPNOTSUPP;
2391
2392 if (err == 0) {
2393 err = -ENOBUFS;
2394 dev = __dev_get_by_name(net, p.name);
2395 if (!dev)
2396 goto err_exit;
2397 err = dev_open(dev);
2398 }
2399 }
2400 #endif
2401
2402 err_exit:
2403 rtnl_unlock();
2404 return err;
2405 }
2406
2407 /*
2408 * Manual configuration of address on an interface
2409 */
2410 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2411 const struct in6_addr *peer_pfx,
2412 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2413 __u32 valid_lft)
2414 {
2415 struct inet6_ifaddr *ifp;
2416 struct inet6_dev *idev;
2417 struct net_device *dev;
2418 int scope;
2419 u32 flags;
2420 clock_t expires;
2421 unsigned long timeout;
2422
2423 ASSERT_RTNL();
2424
2425 if (plen > 128)
2426 return -EINVAL;
2427
2428 /* check the lifetime */
2429 if (!valid_lft || prefered_lft > valid_lft)
2430 return -EINVAL;
2431
2432 dev = __dev_get_by_index(net, ifindex);
2433 if (!dev)
2434 return -ENODEV;
2435
2436 idev = addrconf_add_dev(dev);
2437 if (IS_ERR(idev))
2438 return PTR_ERR(idev);
2439
2440 scope = ipv6_addr_scope(pfx);
2441
2442 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2443 if (addrconf_finite_timeout(timeout)) {
2444 expires = jiffies_to_clock_t(timeout * HZ);
2445 valid_lft = timeout;
2446 flags = RTF_EXPIRES;
2447 } else {
2448 expires = 0;
2449 flags = 0;
2450 ifa_flags |= IFA_F_PERMANENT;
2451 }
2452
2453 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2454 if (addrconf_finite_timeout(timeout)) {
2455 if (timeout == 0)
2456 ifa_flags |= IFA_F_DEPRECATED;
2457 prefered_lft = timeout;
2458 }
2459
2460 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2461 valid_lft, prefered_lft);
2462
2463 if (!IS_ERR(ifp)) {
2464 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2465 expires, flags);
2466 /*
2467 * Note that section 3.1 of RFC 4429 indicates
2468 * that the Optimistic flag should not be set for
2469 * manually configured addresses
2470 */
2471 addrconf_dad_start(ifp);
2472 in6_ifa_put(ifp);
2473 addrconf_verify(0);
2474 return 0;
2475 }
2476
2477 return PTR_ERR(ifp);
2478 }
2479
2480 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2481 unsigned int plen)
2482 {
2483 struct inet6_ifaddr *ifp;
2484 struct inet6_dev *idev;
2485 struct net_device *dev;
2486
2487 if (plen > 128)
2488 return -EINVAL;
2489
2490 dev = __dev_get_by_index(net, ifindex);
2491 if (!dev)
2492 return -ENODEV;
2493
2494 if ((idev = __in6_dev_get(dev)) == NULL)
2495 return -ENXIO;
2496
2497 read_lock_bh(&idev->lock);
2498 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2499 if (ifp->prefix_len == plen &&
2500 ipv6_addr_equal(pfx, &ifp->addr)) {
2501 in6_ifa_hold(ifp);
2502 read_unlock_bh(&idev->lock);
2503
2504 ipv6_del_addr(ifp);
2505 return 0;
2506 }
2507 }
2508 read_unlock_bh(&idev->lock);
2509 return -EADDRNOTAVAIL;
2510 }
2511
2512
2513 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2514 {
2515 struct in6_ifreq ireq;
2516 int err;
2517
2518 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2519 return -EPERM;
2520
2521 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2522 return -EFAULT;
2523
2524 rtnl_lock();
2525 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2526 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2527 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2528 rtnl_unlock();
2529 return err;
2530 }
2531
2532 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2533 {
2534 struct in6_ifreq ireq;
2535 int err;
2536
2537 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2538 return -EPERM;
2539
2540 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2541 return -EFAULT;
2542
2543 rtnl_lock();
2544 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2545 ireq.ifr6_prefixlen);
2546 rtnl_unlock();
2547 return err;
2548 }
2549
2550 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2551 int plen, int scope)
2552 {
2553 struct inet6_ifaddr *ifp;
2554
2555 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2556 scope, IFA_F_PERMANENT, 0, 0);
2557 if (!IS_ERR(ifp)) {
2558 spin_lock_bh(&ifp->lock);
2559 ifp->flags &= ~IFA_F_TENTATIVE;
2560 spin_unlock_bh(&ifp->lock);
2561 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2562 in6_ifa_put(ifp);
2563 }
2564 }
2565
2566 #if IS_ENABLED(CONFIG_IPV6_SIT)
2567 static void sit_add_v4_addrs(struct inet6_dev *idev)
2568 {
2569 struct in6_addr addr;
2570 struct net_device *dev;
2571 struct net *net = dev_net(idev->dev);
2572 int scope;
2573
2574 ASSERT_RTNL();
2575
2576 memset(&addr, 0, sizeof(struct in6_addr));
2577 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2578
2579 if (idev->dev->flags&IFF_POINTOPOINT) {
2580 addr.s6_addr32[0] = htonl(0xfe800000);
2581 scope = IFA_LINK;
2582 } else {
2583 scope = IPV6_ADDR_COMPATv4;
2584 }
2585
2586 if (addr.s6_addr32[3]) {
2587 add_addr(idev, &addr, 128, scope);
2588 return;
2589 }
2590
2591 for_each_netdev(net, dev) {
2592 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2593 if (in_dev && (dev->flags & IFF_UP)) {
2594 struct in_ifaddr *ifa;
2595
2596 int flag = scope;
2597
2598 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2599 int plen;
2600
2601 addr.s6_addr32[3] = ifa->ifa_local;
2602
2603 if (ifa->ifa_scope == RT_SCOPE_LINK)
2604 continue;
2605 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2606 if (idev->dev->flags&IFF_POINTOPOINT)
2607 continue;
2608 flag |= IFA_HOST;
2609 }
2610 if (idev->dev->flags&IFF_POINTOPOINT)
2611 plen = 64;
2612 else
2613 plen = 96;
2614
2615 add_addr(idev, &addr, plen, flag);
2616 }
2617 }
2618 }
2619 }
2620 #endif
2621
2622 static void init_loopback(struct net_device *dev)
2623 {
2624 struct inet6_dev *idev;
2625 struct net_device *sp_dev;
2626 struct inet6_ifaddr *sp_ifa;
2627 struct rt6_info *sp_rt;
2628
2629 /* ::1 */
2630
2631 ASSERT_RTNL();
2632
2633 if ((idev = ipv6_find_idev(dev)) == NULL) {
2634 pr_debug("%s: add_dev failed\n", __func__);
2635 return;
2636 }
2637
2638 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2639
2640 /* Add routes to other interface's IPv6 addresses */
2641 for_each_netdev(dev_net(dev), sp_dev) {
2642 if (!strcmp(sp_dev->name, dev->name))
2643 continue;
2644
2645 idev = __in6_dev_get(sp_dev);
2646 if (!idev)
2647 continue;
2648
2649 read_lock_bh(&idev->lock);
2650 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2651
2652 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2653 continue;
2654
2655 if (sp_ifa->rt)
2656 continue;
2657
2658 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2659
2660 /* Failure cases are ignored */
2661 if (!IS_ERR(sp_rt)) {
2662 sp_ifa->rt = sp_rt;
2663 ip6_ins_rt(sp_rt);
2664 }
2665 }
2666 read_unlock_bh(&idev->lock);
2667 }
2668 }
2669
2670 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2671 {
2672 struct inet6_ifaddr *ifp;
2673 u32 addr_flags = IFA_F_PERMANENT;
2674
2675 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2676 if (idev->cnf.optimistic_dad &&
2677 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2678 addr_flags |= IFA_F_OPTIMISTIC;
2679 #endif
2680
2681
2682 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0);
2683 if (!IS_ERR(ifp)) {
2684 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2685 addrconf_dad_start(ifp);
2686 in6_ifa_put(ifp);
2687 }
2688 }
2689
2690 static void addrconf_dev_config(struct net_device *dev)
2691 {
2692 struct in6_addr addr;
2693 struct inet6_dev *idev;
2694
2695 ASSERT_RTNL();
2696
2697 if ((dev->type != ARPHRD_ETHER) &&
2698 (dev->type != ARPHRD_FDDI) &&
2699 (dev->type != ARPHRD_ARCNET) &&
2700 (dev->type != ARPHRD_INFINIBAND) &&
2701 (dev->type != ARPHRD_IEEE802154) &&
2702 (dev->type != ARPHRD_IEEE1394) &&
2703 (dev->type != ARPHRD_TUNNEL6)) {
2704 /* Alas, we support only Ethernet autoconfiguration. */
2705 return;
2706 }
2707
2708 idev = addrconf_add_dev(dev);
2709 if (IS_ERR(idev))
2710 return;
2711
2712 memset(&addr, 0, sizeof(struct in6_addr));
2713 addr.s6_addr32[0] = htonl(0xFE800000);
2714
2715 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2716 addrconf_add_linklocal(idev, &addr);
2717 }
2718
2719 #if IS_ENABLED(CONFIG_IPV6_SIT)
2720 static void addrconf_sit_config(struct net_device *dev)
2721 {
2722 struct inet6_dev *idev;
2723
2724 ASSERT_RTNL();
2725
2726 /*
2727 * Configure the tunnel with one of our IPv4
2728 * addresses... we should configure all of
2729 * our v4 addrs in the tunnel
2730 */
2731
2732 if ((idev = ipv6_find_idev(dev)) == NULL) {
2733 pr_debug("%s: add_dev failed\n", __func__);
2734 return;
2735 }
2736
2737 if (dev->priv_flags & IFF_ISATAP) {
2738 struct in6_addr addr;
2739
2740 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2741 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2742 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2743 addrconf_add_linklocal(idev, &addr);
2744 return;
2745 }
2746
2747 sit_add_v4_addrs(idev);
2748
2749 if (dev->flags&IFF_POINTOPOINT)
2750 addrconf_add_mroute(dev);
2751 else
2752 sit_route_add(dev);
2753 }
2754 #endif
2755
2756 #if IS_ENABLED(CONFIG_NET_IPGRE)
2757 static void addrconf_gre_config(struct net_device *dev)
2758 {
2759 struct inet6_dev *idev;
2760 struct in6_addr addr;
2761
2762 ASSERT_RTNL();
2763
2764 if ((idev = ipv6_find_idev(dev)) == NULL) {
2765 pr_debug("%s: add_dev failed\n", __func__);
2766 return;
2767 }
2768
2769 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2770 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2771
2772 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2773 addrconf_add_linklocal(idev, &addr);
2774 }
2775 #endif
2776
2777 static inline int
2778 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2779 {
2780 struct in6_addr lladdr;
2781
2782 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2783 addrconf_add_linklocal(idev, &lladdr);
2784 return 0;
2785 }
2786 return -1;
2787 }
2788
2789 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2790 void *ptr)
2791 {
2792 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2793 struct inet6_dev *idev = __in6_dev_get(dev);
2794 int run_pending = 0;
2795 int err;
2796
2797 switch (event) {
2798 case NETDEV_REGISTER:
2799 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2800 idev = ipv6_add_dev(dev);
2801 if (!idev)
2802 return notifier_from_errno(-ENOMEM);
2803 }
2804 break;
2805
2806 case NETDEV_UP:
2807 case NETDEV_CHANGE:
2808 if (dev->flags & IFF_SLAVE)
2809 break;
2810
2811 if (event == NETDEV_UP) {
2812 if (!addrconf_qdisc_ok(dev)) {
2813 /* device is not ready yet. */
2814 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2815 dev->name);
2816 break;
2817 }
2818
2819 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2820 idev = ipv6_add_dev(dev);
2821
2822 if (idev) {
2823 idev->if_flags |= IF_READY;
2824 run_pending = 1;
2825 }
2826 } else {
2827 if (!addrconf_qdisc_ok(dev)) {
2828 /* device is still not ready. */
2829 break;
2830 }
2831
2832 if (idev) {
2833 if (idev->if_flags & IF_READY)
2834 /* device is already configured. */
2835 break;
2836 idev->if_flags |= IF_READY;
2837 }
2838
2839 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2840 dev->name);
2841
2842 run_pending = 1;
2843 }
2844
2845 switch (dev->type) {
2846 #if IS_ENABLED(CONFIG_IPV6_SIT)
2847 case ARPHRD_SIT:
2848 addrconf_sit_config(dev);
2849 break;
2850 #endif
2851 #if IS_ENABLED(CONFIG_NET_IPGRE)
2852 case ARPHRD_IPGRE:
2853 addrconf_gre_config(dev);
2854 break;
2855 #endif
2856 case ARPHRD_LOOPBACK:
2857 init_loopback(dev);
2858 break;
2859
2860 default:
2861 addrconf_dev_config(dev);
2862 break;
2863 }
2864
2865 if (idev) {
2866 if (run_pending)
2867 addrconf_dad_run(idev);
2868
2869 /*
2870 * If the MTU changed during the interface down,
2871 * when the interface up, the changed MTU must be
2872 * reflected in the idev as well as routers.
2873 */
2874 if (idev->cnf.mtu6 != dev->mtu &&
2875 dev->mtu >= IPV6_MIN_MTU) {
2876 rt6_mtu_change(dev, dev->mtu);
2877 idev->cnf.mtu6 = dev->mtu;
2878 }
2879 idev->tstamp = jiffies;
2880 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2881
2882 /*
2883 * If the changed mtu during down is lower than
2884 * IPV6_MIN_MTU stop IPv6 on this interface.
2885 */
2886 if (dev->mtu < IPV6_MIN_MTU)
2887 addrconf_ifdown(dev, 1);
2888 }
2889 break;
2890
2891 case NETDEV_CHANGEMTU:
2892 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2893 rt6_mtu_change(dev, dev->mtu);
2894 idev->cnf.mtu6 = dev->mtu;
2895 break;
2896 }
2897
2898 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2899 idev = ipv6_add_dev(dev);
2900 if (idev)
2901 break;
2902 }
2903
2904 /*
2905 * MTU falled under IPV6_MIN_MTU.
2906 * Stop IPv6 on this interface.
2907 */
2908
2909 case NETDEV_DOWN:
2910 case NETDEV_UNREGISTER:
2911 /*
2912 * Remove all addresses from this interface.
2913 */
2914 addrconf_ifdown(dev, event != NETDEV_DOWN);
2915 break;
2916
2917 case NETDEV_CHANGENAME:
2918 if (idev) {
2919 snmp6_unregister_dev(idev);
2920 addrconf_sysctl_unregister(idev);
2921 addrconf_sysctl_register(idev);
2922 err = snmp6_register_dev(idev);
2923 if (err)
2924 return notifier_from_errno(err);
2925 }
2926 break;
2927
2928 case NETDEV_PRE_TYPE_CHANGE:
2929 case NETDEV_POST_TYPE_CHANGE:
2930 addrconf_type_change(dev, event);
2931 break;
2932 }
2933
2934 return NOTIFY_OK;
2935 }
2936
2937 /*
2938 * addrconf module should be notified of a device going up
2939 */
2940 static struct notifier_block ipv6_dev_notf = {
2941 .notifier_call = addrconf_notify,
2942 };
2943
2944 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2945 {
2946 struct inet6_dev *idev;
2947 ASSERT_RTNL();
2948
2949 idev = __in6_dev_get(dev);
2950
2951 if (event == NETDEV_POST_TYPE_CHANGE)
2952 ipv6_mc_remap(idev);
2953 else if (event == NETDEV_PRE_TYPE_CHANGE)
2954 ipv6_mc_unmap(idev);
2955 }
2956
2957 static int addrconf_ifdown(struct net_device *dev, int how)
2958 {
2959 struct net *net = dev_net(dev);
2960 struct inet6_dev *idev;
2961 struct inet6_ifaddr *ifa;
2962 int state, i;
2963
2964 ASSERT_RTNL();
2965
2966 rt6_ifdown(net, dev);
2967 neigh_ifdown(&nd_tbl, dev);
2968
2969 idev = __in6_dev_get(dev);
2970 if (idev == NULL)
2971 return -ENODEV;
2972
2973 /*
2974 * Step 1: remove reference to ipv6 device from parent device.
2975 * Do not dev_put!
2976 */
2977 if (how) {
2978 idev->dead = 1;
2979
2980 /* protected by rtnl_lock */
2981 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2982
2983 /* Step 1.5: remove snmp6 entry */
2984 snmp6_unregister_dev(idev);
2985
2986 }
2987
2988 /* Step 2: clear hash table */
2989 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2990 struct hlist_head *h = &inet6_addr_lst[i];
2991
2992 spin_lock_bh(&addrconf_hash_lock);
2993 restart:
2994 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
2995 if (ifa->idev == idev) {
2996 hlist_del_init_rcu(&ifa->addr_lst);
2997 addrconf_del_dad_timer(ifa);
2998 goto restart;
2999 }
3000 }
3001 spin_unlock_bh(&addrconf_hash_lock);
3002 }
3003
3004 write_lock_bh(&idev->lock);
3005
3006 addrconf_del_rs_timer(idev);
3007
3008 /* Step 2: clear flags for stateless addrconf */
3009 if (!how)
3010 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3011
3012 #ifdef CONFIG_IPV6_PRIVACY
3013 if (how && del_timer(&idev->regen_timer))
3014 in6_dev_put(idev);
3015
3016 /* Step 3: clear tempaddr list */
3017 while (!list_empty(&idev->tempaddr_list)) {
3018 ifa = list_first_entry(&idev->tempaddr_list,
3019 struct inet6_ifaddr, tmp_list);
3020 list_del(&ifa->tmp_list);
3021 write_unlock_bh(&idev->lock);
3022 spin_lock_bh(&ifa->lock);
3023
3024 if (ifa->ifpub) {
3025 in6_ifa_put(ifa->ifpub);
3026 ifa->ifpub = NULL;
3027 }
3028 spin_unlock_bh(&ifa->lock);
3029 in6_ifa_put(ifa);
3030 write_lock_bh(&idev->lock);
3031 }
3032 #endif
3033
3034 while (!list_empty(&idev->addr_list)) {
3035 ifa = list_first_entry(&idev->addr_list,
3036 struct inet6_ifaddr, if_list);
3037 addrconf_del_dad_timer(ifa);
3038
3039 list_del(&ifa->if_list);
3040
3041 write_unlock_bh(&idev->lock);
3042
3043 spin_lock_bh(&ifa->state_lock);
3044 state = ifa->state;
3045 ifa->state = INET6_IFADDR_STATE_DEAD;
3046 spin_unlock_bh(&ifa->state_lock);
3047
3048 if (state != INET6_IFADDR_STATE_DEAD) {
3049 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3050 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3051 }
3052 in6_ifa_put(ifa);
3053
3054 write_lock_bh(&idev->lock);
3055 }
3056
3057 write_unlock_bh(&idev->lock);
3058
3059 /* Step 5: Discard multicast list */
3060 if (how)
3061 ipv6_mc_destroy_dev(idev);
3062 else
3063 ipv6_mc_down(idev);
3064
3065 idev->tstamp = jiffies;
3066
3067 /* Last: Shot the device (if unregistered) */
3068 if (how) {
3069 addrconf_sysctl_unregister(idev);
3070 neigh_parms_release(&nd_tbl, idev->nd_parms);
3071 neigh_ifdown(&nd_tbl, dev);
3072 in6_dev_put(idev);
3073 }
3074 return 0;
3075 }
3076
3077 static void addrconf_rs_timer(unsigned long data)
3078 {
3079 struct inet6_dev *idev = (struct inet6_dev *)data;
3080 struct net_device *dev = idev->dev;
3081 struct in6_addr lladdr;
3082
3083 write_lock(&idev->lock);
3084 if (idev->dead || !(idev->if_flags & IF_READY))
3085 goto out;
3086
3087 if (!ipv6_accept_ra(idev))
3088 goto out;
3089
3090 /* Announcement received after solicitation was sent */
3091 if (idev->if_flags & IF_RA_RCVD)
3092 goto out;
3093
3094 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3095 write_unlock(&idev->lock);
3096 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3097 ndisc_send_rs(dev, &lladdr,
3098 &in6addr_linklocal_allrouters);
3099 else
3100 goto put;
3101
3102 write_lock(&idev->lock);
3103 /* The wait after the last probe can be shorter */
3104 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3105 idev->cnf.rtr_solicits) ?
3106 idev->cnf.rtr_solicit_delay :
3107 idev->cnf.rtr_solicit_interval);
3108 } else {
3109 /*
3110 * Note: we do not support deprecated "all on-link"
3111 * assumption any longer.
3112 */
3113 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3114 }
3115
3116 out:
3117 write_unlock(&idev->lock);
3118 put:
3119 in6_dev_put(idev);
3120 }
3121
3122 /*
3123 * Duplicate Address Detection
3124 */
3125 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3126 {
3127 unsigned long rand_num;
3128 struct inet6_dev *idev = ifp->idev;
3129
3130 if (ifp->flags & IFA_F_OPTIMISTIC)
3131 rand_num = 0;
3132 else
3133 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3134
3135 ifp->dad_probes = idev->cnf.dad_transmits;
3136 addrconf_mod_dad_timer(ifp, rand_num);
3137 }
3138
3139 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3140 {
3141 struct inet6_dev *idev = ifp->idev;
3142 struct net_device *dev = idev->dev;
3143
3144 addrconf_join_solict(dev, &ifp->addr);
3145
3146 net_srandom(ifp->addr.s6_addr32[3]);
3147
3148 read_lock_bh(&idev->lock);
3149 spin_lock(&ifp->lock);
3150 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3151 goto out;
3152
3153 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3154 idev->cnf.accept_dad < 1 ||
3155 !(ifp->flags&IFA_F_TENTATIVE) ||
3156 ifp->flags & IFA_F_NODAD) {
3157 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3158 spin_unlock(&ifp->lock);
3159 read_unlock_bh(&idev->lock);
3160
3161 addrconf_dad_completed(ifp);
3162 return;
3163 }
3164
3165 if (!(idev->if_flags & IF_READY)) {
3166 spin_unlock(&ifp->lock);
3167 read_unlock_bh(&idev->lock);
3168 /*
3169 * If the device is not ready:
3170 * - keep it tentative if it is a permanent address.
3171 * - otherwise, kill it.
3172 */
3173 in6_ifa_hold(ifp);
3174 addrconf_dad_stop(ifp, 0);
3175 return;
3176 }
3177
3178 /*
3179 * Optimistic nodes can start receiving
3180 * Frames right away
3181 */
3182 if (ifp->flags & IFA_F_OPTIMISTIC)
3183 ip6_ins_rt(ifp->rt);
3184
3185 addrconf_dad_kick(ifp);
3186 out:
3187 spin_unlock(&ifp->lock);
3188 read_unlock_bh(&idev->lock);
3189 }
3190
3191 static void addrconf_dad_timer(unsigned long data)
3192 {
3193 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3194 struct inet6_dev *idev = ifp->idev;
3195 struct in6_addr mcaddr;
3196
3197 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3198 goto out;
3199
3200 write_lock(&idev->lock);
3201 if (idev->dead || !(idev->if_flags & IF_READY)) {
3202 write_unlock(&idev->lock);
3203 goto out;
3204 }
3205
3206 spin_lock(&ifp->lock);
3207 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3208 spin_unlock(&ifp->lock);
3209 write_unlock(&idev->lock);
3210 goto out;
3211 }
3212
3213 if (ifp->dad_probes == 0) {
3214 /*
3215 * DAD was successful
3216 */
3217
3218 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3219 spin_unlock(&ifp->lock);
3220 write_unlock(&idev->lock);
3221
3222 addrconf_dad_completed(ifp);
3223
3224 goto out;
3225 }
3226
3227 ifp->dad_probes--;
3228 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
3229 spin_unlock(&ifp->lock);
3230 write_unlock(&idev->lock);
3231
3232 /* send a neighbour solicitation for our addr */
3233 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3234 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3235 out:
3236 in6_ifa_put(ifp);
3237 }
3238
3239 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3240 {
3241 struct net_device *dev = ifp->idev->dev;
3242 struct in6_addr lladdr;
3243 bool send_rs, send_mld;
3244
3245 addrconf_del_dad_timer(ifp);
3246
3247 /*
3248 * Configure the address for reception. Now it is valid.
3249 */
3250
3251 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3252
3253 /* If added prefix is link local and we are prepared to process
3254 router advertisements, start sending router solicitations.
3255 */
3256
3257 read_lock_bh(&ifp->idev->lock);
3258 spin_lock(&ifp->lock);
3259 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3260 ifp->idev->valid_ll_addr_cnt == 1;
3261 send_rs = send_mld &&
3262 ipv6_accept_ra(ifp->idev) &&
3263 ifp->idev->cnf.rtr_solicits > 0 &&
3264 (dev->flags&IFF_LOOPBACK) == 0;
3265 spin_unlock(&ifp->lock);
3266 read_unlock_bh(&ifp->idev->lock);
3267
3268 /* While dad is in progress mld report's source address is in6_addrany.
3269 * Resend with proper ll now.
3270 */
3271 if (send_mld)
3272 ipv6_mc_dad_complete(ifp->idev);
3273
3274 if (send_rs) {
3275 /*
3276 * If a host as already performed a random delay
3277 * [...] as part of DAD [...] there is no need
3278 * to delay again before sending the first RS
3279 */
3280 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3281 return;
3282 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3283
3284 write_lock_bh(&ifp->idev->lock);
3285 spin_lock(&ifp->lock);
3286 ifp->idev->rs_probes = 1;
3287 ifp->idev->if_flags |= IF_RS_SENT;
3288 addrconf_mod_rs_timer(ifp->idev,
3289 ifp->idev->cnf.rtr_solicit_interval);
3290 spin_unlock(&ifp->lock);
3291 write_unlock_bh(&ifp->idev->lock);
3292 }
3293 }
3294
3295 static void addrconf_dad_run(struct inet6_dev *idev)
3296 {
3297 struct inet6_ifaddr *ifp;
3298
3299 read_lock_bh(&idev->lock);
3300 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3301 spin_lock(&ifp->lock);
3302 if (ifp->flags & IFA_F_TENTATIVE &&
3303 ifp->state == INET6_IFADDR_STATE_DAD)
3304 addrconf_dad_kick(ifp);
3305 spin_unlock(&ifp->lock);
3306 }
3307 read_unlock_bh(&idev->lock);
3308 }
3309
3310 #ifdef CONFIG_PROC_FS
3311 struct if6_iter_state {
3312 struct seq_net_private p;
3313 int bucket;
3314 int offset;
3315 };
3316
3317 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3318 {
3319 struct inet6_ifaddr *ifa = NULL;
3320 struct if6_iter_state *state = seq->private;
3321 struct net *net = seq_file_net(seq);
3322 int p = 0;
3323
3324 /* initial bucket if pos is 0 */
3325 if (pos == 0) {
3326 state->bucket = 0;
3327 state->offset = 0;
3328 }
3329
3330 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3331 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3332 addr_lst) {
3333 if (!net_eq(dev_net(ifa->idev->dev), net))
3334 continue;
3335 /* sync with offset */
3336 if (p < state->offset) {
3337 p++;
3338 continue;
3339 }
3340 state->offset++;
3341 return ifa;
3342 }
3343
3344 /* prepare for next bucket */
3345 state->offset = 0;
3346 p = 0;
3347 }
3348 return NULL;
3349 }
3350
3351 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3352 struct inet6_ifaddr *ifa)
3353 {
3354 struct if6_iter_state *state = seq->private;
3355 struct net *net = seq_file_net(seq);
3356
3357 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3358 if (!net_eq(dev_net(ifa->idev->dev), net))
3359 continue;
3360 state->offset++;
3361 return ifa;
3362 }
3363
3364 while (++state->bucket < IN6_ADDR_HSIZE) {
3365 state->offset = 0;
3366 hlist_for_each_entry_rcu_bh(ifa,
3367 &inet6_addr_lst[state->bucket], addr_lst) {
3368 if (!net_eq(dev_net(ifa->idev->dev), net))
3369 continue;
3370 state->offset++;
3371 return ifa;
3372 }
3373 }
3374
3375 return NULL;
3376 }
3377
3378 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3379 __acquires(rcu_bh)
3380 {
3381 rcu_read_lock_bh();
3382 return if6_get_first(seq, *pos);
3383 }
3384
3385 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3386 {
3387 struct inet6_ifaddr *ifa;
3388
3389 ifa = if6_get_next(seq, v);
3390 ++*pos;
3391 return ifa;
3392 }
3393
3394 static void if6_seq_stop(struct seq_file *seq, void *v)
3395 __releases(rcu_bh)
3396 {
3397 rcu_read_unlock_bh();
3398 }
3399
3400 static int if6_seq_show(struct seq_file *seq, void *v)
3401 {
3402 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3403 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3404 &ifp->addr,
3405 ifp->idev->dev->ifindex,
3406 ifp->prefix_len,
3407 ifp->scope,
3408 ifp->flags,
3409 ifp->idev->dev->name);
3410 return 0;
3411 }
3412
3413 static const struct seq_operations if6_seq_ops = {
3414 .start = if6_seq_start,
3415 .next = if6_seq_next,
3416 .show = if6_seq_show,
3417 .stop = if6_seq_stop,
3418 };
3419
3420 static int if6_seq_open(struct inode *inode, struct file *file)
3421 {
3422 return seq_open_net(inode, file, &if6_seq_ops,
3423 sizeof(struct if6_iter_state));
3424 }
3425
3426 static const struct file_operations if6_fops = {
3427 .owner = THIS_MODULE,
3428 .open = if6_seq_open,
3429 .read = seq_read,
3430 .llseek = seq_lseek,
3431 .release = seq_release_net,
3432 };
3433
3434 static int __net_init if6_proc_net_init(struct net *net)
3435 {
3436 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3437 return -ENOMEM;
3438 return 0;
3439 }
3440
3441 static void __net_exit if6_proc_net_exit(struct net *net)
3442 {
3443 remove_proc_entry("if_inet6", net->proc_net);
3444 }
3445
3446 static struct pernet_operations if6_proc_net_ops = {
3447 .init = if6_proc_net_init,
3448 .exit = if6_proc_net_exit,
3449 };
3450
3451 int __init if6_proc_init(void)
3452 {
3453 return register_pernet_subsys(&if6_proc_net_ops);
3454 }
3455
3456 void if6_proc_exit(void)
3457 {
3458 unregister_pernet_subsys(&if6_proc_net_ops);
3459 }
3460 #endif /* CONFIG_PROC_FS */
3461
3462 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3463 /* Check if address is a home address configured on any interface. */
3464 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3465 {
3466 int ret = 0;
3467 struct inet6_ifaddr *ifp = NULL;
3468 unsigned int hash = inet6_addr_hash(addr);
3469
3470 rcu_read_lock_bh();
3471 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3472 if (!net_eq(dev_net(ifp->idev->dev), net))
3473 continue;
3474 if (ipv6_addr_equal(&ifp->addr, addr) &&
3475 (ifp->flags & IFA_F_HOMEADDRESS)) {
3476 ret = 1;
3477 break;
3478 }
3479 }
3480 rcu_read_unlock_bh();
3481 return ret;
3482 }
3483 #endif
3484
3485 /*
3486 * Periodic address status verification
3487 */
3488
3489 static void addrconf_verify(unsigned long foo)
3490 {
3491 unsigned long now, next, next_sec, next_sched;
3492 struct inet6_ifaddr *ifp;
3493 int i;
3494
3495 rcu_read_lock_bh();
3496 spin_lock(&addrconf_verify_lock);
3497 now = jiffies;
3498 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3499
3500 del_timer(&addr_chk_timer);
3501
3502 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3503 restart:
3504 hlist_for_each_entry_rcu_bh(ifp,
3505 &inet6_addr_lst[i], addr_lst) {
3506 unsigned long age;
3507
3508 if (ifp->flags & IFA_F_PERMANENT)
3509 continue;
3510
3511 spin_lock(&ifp->lock);
3512 /* We try to batch several events at once. */
3513 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3514
3515 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3516 age >= ifp->valid_lft) {
3517 spin_unlock(&ifp->lock);
3518 in6_ifa_hold(ifp);
3519 ipv6_del_addr(ifp);
3520 goto restart;
3521 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3522 spin_unlock(&ifp->lock);
3523 continue;
3524 } else if (age >= ifp->prefered_lft) {
3525 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3526 int deprecate = 0;
3527
3528 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3529 deprecate = 1;
3530 ifp->flags |= IFA_F_DEPRECATED;
3531 }
3532
3533 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3534 next = ifp->tstamp + ifp->valid_lft * HZ;
3535
3536 spin_unlock(&ifp->lock);
3537
3538 if (deprecate) {
3539 in6_ifa_hold(ifp);
3540
3541 ipv6_ifa_notify(0, ifp);
3542 in6_ifa_put(ifp);
3543 goto restart;
3544 }
3545 #ifdef CONFIG_IPV6_PRIVACY
3546 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3547 !(ifp->flags&IFA_F_TENTATIVE)) {
3548 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3549 ifp->idev->cnf.dad_transmits *
3550 ifp->idev->nd_parms->retrans_time / HZ;
3551
3552 if (age >= ifp->prefered_lft - regen_advance) {
3553 struct inet6_ifaddr *ifpub = ifp->ifpub;
3554 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3555 next = ifp->tstamp + ifp->prefered_lft * HZ;
3556 if (!ifp->regen_count && ifpub) {
3557 ifp->regen_count++;
3558 in6_ifa_hold(ifp);
3559 in6_ifa_hold(ifpub);
3560 spin_unlock(&ifp->lock);
3561
3562 spin_lock(&ifpub->lock);
3563 ifpub->regen_count = 0;
3564 spin_unlock(&ifpub->lock);
3565 ipv6_create_tempaddr(ifpub, ifp);
3566 in6_ifa_put(ifpub);
3567 in6_ifa_put(ifp);
3568 goto restart;
3569 }
3570 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3571 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3572 spin_unlock(&ifp->lock);
3573 #endif
3574 } else {
3575 /* ifp->prefered_lft <= ifp->valid_lft */
3576 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3577 next = ifp->tstamp + ifp->prefered_lft * HZ;
3578 spin_unlock(&ifp->lock);
3579 }
3580 }
3581 }
3582
3583 next_sec = round_jiffies_up(next);
3584 next_sched = next;
3585
3586 /* If rounded timeout is accurate enough, accept it. */
3587 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3588 next_sched = next_sec;
3589
3590 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3591 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3592 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3593
3594 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3595 now, next, next_sec, next_sched);
3596
3597 addr_chk_timer.expires = next_sched;
3598 add_timer(&addr_chk_timer);
3599 spin_unlock(&addrconf_verify_lock);
3600 rcu_read_unlock_bh();
3601 }
3602
3603 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3604 struct in6_addr **peer_pfx)
3605 {
3606 struct in6_addr *pfx = NULL;
3607
3608 *peer_pfx = NULL;
3609
3610 if (addr)
3611 pfx = nla_data(addr);
3612
3613 if (local) {
3614 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3615 *peer_pfx = pfx;
3616 pfx = nla_data(local);
3617 }
3618
3619 return pfx;
3620 }
3621
3622 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3623 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3624 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3625 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3626 };
3627
3628 static int
3629 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3630 {
3631 struct net *net = sock_net(skb->sk);
3632 struct ifaddrmsg *ifm;
3633 struct nlattr *tb[IFA_MAX+1];
3634 struct in6_addr *pfx, *peer_pfx;
3635 int err;
3636
3637 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3638 if (err < 0)
3639 return err;
3640
3641 ifm = nlmsg_data(nlh);
3642 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3643 if (pfx == NULL)
3644 return -EINVAL;
3645
3646 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3647 }
3648
3649 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3650 u32 prefered_lft, u32 valid_lft)
3651 {
3652 u32 flags;
3653 clock_t expires;
3654 unsigned long timeout;
3655
3656 if (!valid_lft || (prefered_lft > valid_lft))
3657 return -EINVAL;
3658
3659 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3660 if (addrconf_finite_timeout(timeout)) {
3661 expires = jiffies_to_clock_t(timeout * HZ);
3662 valid_lft = timeout;
3663 flags = RTF_EXPIRES;
3664 } else {
3665 expires = 0;
3666 flags = 0;
3667 ifa_flags |= IFA_F_PERMANENT;
3668 }
3669
3670 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3671 if (addrconf_finite_timeout(timeout)) {
3672 if (timeout == 0)
3673 ifa_flags |= IFA_F_DEPRECATED;
3674 prefered_lft = timeout;
3675 }
3676
3677 spin_lock_bh(&ifp->lock);
3678 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3679 ifp->tstamp = jiffies;
3680 ifp->valid_lft = valid_lft;
3681 ifp->prefered_lft = prefered_lft;
3682
3683 spin_unlock_bh(&ifp->lock);
3684 if (!(ifp->flags&IFA_F_TENTATIVE))
3685 ipv6_ifa_notify(0, ifp);
3686
3687 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3688 expires, flags);
3689 addrconf_verify(0);
3690
3691 return 0;
3692 }
3693
3694 static int
3695 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3696 {
3697 struct net *net = sock_net(skb->sk);
3698 struct ifaddrmsg *ifm;
3699 struct nlattr *tb[IFA_MAX+1];
3700 struct in6_addr *pfx, *peer_pfx;
3701 struct inet6_ifaddr *ifa;
3702 struct net_device *dev;
3703 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3704 u8 ifa_flags;
3705 int err;
3706
3707 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3708 if (err < 0)
3709 return err;
3710
3711 ifm = nlmsg_data(nlh);
3712 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3713 if (pfx == NULL)
3714 return -EINVAL;
3715
3716 if (tb[IFA_CACHEINFO]) {
3717 struct ifa_cacheinfo *ci;
3718
3719 ci = nla_data(tb[IFA_CACHEINFO]);
3720 valid_lft = ci->ifa_valid;
3721 preferred_lft = ci->ifa_prefered;
3722 } else {
3723 preferred_lft = INFINITY_LIFE_TIME;
3724 valid_lft = INFINITY_LIFE_TIME;
3725 }
3726
3727 dev = __dev_get_by_index(net, ifm->ifa_index);
3728 if (dev == NULL)
3729 return -ENODEV;
3730
3731 /* We ignore other flags so far. */
3732 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3733
3734 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3735 if (ifa == NULL) {
3736 /*
3737 * It would be best to check for !NLM_F_CREATE here but
3738 * userspace alreay relies on not having to provide this.
3739 */
3740 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3741 ifm->ifa_prefixlen, ifa_flags,
3742 preferred_lft, valid_lft);
3743 }
3744
3745 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3746 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3747 err = -EEXIST;
3748 else
3749 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3750
3751 in6_ifa_put(ifa);
3752
3753 return err;
3754 }
3755
3756 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3757 u8 scope, int ifindex)
3758 {
3759 struct ifaddrmsg *ifm;
3760
3761 ifm = nlmsg_data(nlh);
3762 ifm->ifa_family = AF_INET6;
3763 ifm->ifa_prefixlen = prefixlen;
3764 ifm->ifa_flags = flags;
3765 ifm->ifa_scope = scope;
3766 ifm->ifa_index = ifindex;
3767 }
3768
3769 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3770 unsigned long tstamp, u32 preferred, u32 valid)
3771 {
3772 struct ifa_cacheinfo ci;
3773
3774 ci.cstamp = cstamp_delta(cstamp);
3775 ci.tstamp = cstamp_delta(tstamp);
3776 ci.ifa_prefered = preferred;
3777 ci.ifa_valid = valid;
3778
3779 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3780 }
3781
3782 static inline int rt_scope(int ifa_scope)
3783 {
3784 if (ifa_scope & IFA_HOST)
3785 return RT_SCOPE_HOST;
3786 else if (ifa_scope & IFA_LINK)
3787 return RT_SCOPE_LINK;
3788 else if (ifa_scope & IFA_SITE)
3789 return RT_SCOPE_SITE;
3790 else
3791 return RT_SCOPE_UNIVERSE;
3792 }
3793
3794 static inline int inet6_ifaddr_msgsize(void)
3795 {
3796 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3797 + nla_total_size(16) /* IFA_LOCAL */
3798 + nla_total_size(16) /* IFA_ADDRESS */
3799 + nla_total_size(sizeof(struct ifa_cacheinfo));
3800 }
3801
3802 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3803 u32 portid, u32 seq, int event, unsigned int flags)
3804 {
3805 struct nlmsghdr *nlh;
3806 u32 preferred, valid;
3807
3808 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3809 if (nlh == NULL)
3810 return -EMSGSIZE;
3811
3812 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3813 ifa->idev->dev->ifindex);
3814
3815 if (!(ifa->flags&IFA_F_PERMANENT)) {
3816 preferred = ifa->prefered_lft;
3817 valid = ifa->valid_lft;
3818 if (preferred != INFINITY_LIFE_TIME) {
3819 long tval = (jiffies - ifa->tstamp)/HZ;
3820 if (preferred > tval)
3821 preferred -= tval;
3822 else
3823 preferred = 0;
3824 if (valid != INFINITY_LIFE_TIME) {
3825 if (valid > tval)
3826 valid -= tval;
3827 else
3828 valid = 0;
3829 }
3830 }
3831 } else {
3832 preferred = INFINITY_LIFE_TIME;
3833 valid = INFINITY_LIFE_TIME;
3834 }
3835
3836 if (!ipv6_addr_any(&ifa->peer_addr)) {
3837 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3838 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3839 goto error;
3840 } else
3841 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3842 goto error;
3843
3844 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3845 goto error;
3846
3847 return nlmsg_end(skb, nlh);
3848
3849 error:
3850 nlmsg_cancel(skb, nlh);
3851 return -EMSGSIZE;
3852 }
3853
3854 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3855 u32 portid, u32 seq, int event, u16 flags)
3856 {
3857 struct nlmsghdr *nlh;
3858 u8 scope = RT_SCOPE_UNIVERSE;
3859 int ifindex = ifmca->idev->dev->ifindex;
3860
3861 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3862 scope = RT_SCOPE_SITE;
3863
3864 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3865 if (nlh == NULL)
3866 return -EMSGSIZE;
3867
3868 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3869 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3870 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3871 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3872 nlmsg_cancel(skb, nlh);
3873 return -EMSGSIZE;
3874 }
3875
3876 return nlmsg_end(skb, nlh);
3877 }
3878
3879 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3880 u32 portid, u32 seq, int event, unsigned int flags)
3881 {
3882 struct nlmsghdr *nlh;
3883 u8 scope = RT_SCOPE_UNIVERSE;
3884 int ifindex = ifaca->aca_idev->dev->ifindex;
3885
3886 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3887 scope = RT_SCOPE_SITE;
3888
3889 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3890 if (nlh == NULL)
3891 return -EMSGSIZE;
3892
3893 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3894 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3895 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3896 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3897 nlmsg_cancel(skb, nlh);
3898 return -EMSGSIZE;
3899 }
3900
3901 return nlmsg_end(skb, nlh);
3902 }
3903
3904 enum addr_type_t {
3905 UNICAST_ADDR,
3906 MULTICAST_ADDR,
3907 ANYCAST_ADDR,
3908 };
3909
3910 /* called with rcu_read_lock() */
3911 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3912 struct netlink_callback *cb, enum addr_type_t type,
3913 int s_ip_idx, int *p_ip_idx)
3914 {
3915 struct ifmcaddr6 *ifmca;
3916 struct ifacaddr6 *ifaca;
3917 int err = 1;
3918 int ip_idx = *p_ip_idx;
3919
3920 read_lock_bh(&idev->lock);
3921 switch (type) {
3922 case UNICAST_ADDR: {
3923 struct inet6_ifaddr *ifa;
3924
3925 /* unicast address incl. temp addr */
3926 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3927 if (++ip_idx < s_ip_idx)
3928 continue;
3929 err = inet6_fill_ifaddr(skb, ifa,
3930 NETLINK_CB(cb->skb).portid,
3931 cb->nlh->nlmsg_seq,
3932 RTM_NEWADDR,
3933 NLM_F_MULTI);
3934 if (err <= 0)
3935 break;
3936 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3937 }
3938 break;
3939 }
3940 case MULTICAST_ADDR:
3941 /* multicast address */
3942 for (ifmca = idev->mc_list; ifmca;
3943 ifmca = ifmca->next, ip_idx++) {
3944 if (ip_idx < s_ip_idx)
3945 continue;
3946 err = inet6_fill_ifmcaddr(skb, ifmca,
3947 NETLINK_CB(cb->skb).portid,
3948 cb->nlh->nlmsg_seq,
3949 RTM_GETMULTICAST,
3950 NLM_F_MULTI);
3951 if (err <= 0)
3952 break;
3953 }
3954 break;
3955 case ANYCAST_ADDR:
3956 /* anycast address */
3957 for (ifaca = idev->ac_list; ifaca;
3958 ifaca = ifaca->aca_next, ip_idx++) {
3959 if (ip_idx < s_ip_idx)
3960 continue;
3961 err = inet6_fill_ifacaddr(skb, ifaca,
3962 NETLINK_CB(cb->skb).portid,
3963 cb->nlh->nlmsg_seq,
3964 RTM_GETANYCAST,
3965 NLM_F_MULTI);
3966 if (err <= 0)
3967 break;
3968 }
3969 break;
3970 default:
3971 break;
3972 }
3973 read_unlock_bh(&idev->lock);
3974 *p_ip_idx = ip_idx;
3975 return err;
3976 }
3977
3978 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3979 enum addr_type_t type)
3980 {
3981 struct net *net = sock_net(skb->sk);
3982 int h, s_h;
3983 int idx, ip_idx;
3984 int s_idx, s_ip_idx;
3985 struct net_device *dev;
3986 struct inet6_dev *idev;
3987 struct hlist_head *head;
3988
3989 s_h = cb->args[0];
3990 s_idx = idx = cb->args[1];
3991 s_ip_idx = ip_idx = cb->args[2];
3992
3993 rcu_read_lock();
3994 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
3995 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3996 idx = 0;
3997 head = &net->dev_index_head[h];
3998 hlist_for_each_entry_rcu(dev, head, index_hlist) {
3999 if (idx < s_idx)
4000 goto cont;
4001 if (h > s_h || idx > s_idx)
4002 s_ip_idx = 0;
4003 ip_idx = 0;
4004 idev = __in6_dev_get(dev);
4005 if (!idev)
4006 goto cont;
4007
4008 if (in6_dump_addrs(idev, skb, cb, type,
4009 s_ip_idx, &ip_idx) <= 0)
4010 goto done;
4011 cont:
4012 idx++;
4013 }
4014 }
4015 done:
4016 rcu_read_unlock();
4017 cb->args[0] = h;
4018 cb->args[1] = idx;
4019 cb->args[2] = ip_idx;
4020
4021 return skb->len;
4022 }
4023
4024 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4025 {
4026 enum addr_type_t type = UNICAST_ADDR;
4027
4028 return inet6_dump_addr(skb, cb, type);
4029 }
4030
4031 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4032 {
4033 enum addr_type_t type = MULTICAST_ADDR;
4034
4035 return inet6_dump_addr(skb, cb, type);
4036 }
4037
4038
4039 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4040 {
4041 enum addr_type_t type = ANYCAST_ADDR;
4042
4043 return inet6_dump_addr(skb, cb, type);
4044 }
4045
4046 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4047 {
4048 struct net *net = sock_net(in_skb->sk);
4049 struct ifaddrmsg *ifm;
4050 struct nlattr *tb[IFA_MAX+1];
4051 struct in6_addr *addr = NULL, *peer;
4052 struct net_device *dev = NULL;
4053 struct inet6_ifaddr *ifa;
4054 struct sk_buff *skb;
4055 int err;
4056
4057 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4058 if (err < 0)
4059 goto errout;
4060
4061 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4062 if (addr == NULL) {
4063 err = -EINVAL;
4064 goto errout;
4065 }
4066
4067 ifm = nlmsg_data(nlh);
4068 if (ifm->ifa_index)
4069 dev = __dev_get_by_index(net, ifm->ifa_index);
4070
4071 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4072 if (!ifa) {
4073 err = -EADDRNOTAVAIL;
4074 goto errout;
4075 }
4076
4077 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4078 if (!skb) {
4079 err = -ENOBUFS;
4080 goto errout_ifa;
4081 }
4082
4083 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4084 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4085 if (err < 0) {
4086 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4087 WARN_ON(err == -EMSGSIZE);
4088 kfree_skb(skb);
4089 goto errout_ifa;
4090 }
4091 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4092 errout_ifa:
4093 in6_ifa_put(ifa);
4094 errout:
4095 return err;
4096 }
4097
4098 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4099 {
4100 struct sk_buff *skb;
4101 struct net *net = dev_net(ifa->idev->dev);
4102 int err = -ENOBUFS;
4103
4104 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4105 if (skb == NULL)
4106 goto errout;
4107
4108 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4109 if (err < 0) {
4110 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4111 WARN_ON(err == -EMSGSIZE);
4112 kfree_skb(skb);
4113 goto errout;
4114 }
4115 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4116 return;
4117 errout:
4118 if (err < 0)
4119 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4120 }
4121
4122 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4123 __s32 *array, int bytes)
4124 {
4125 BUG_ON(bytes < (DEVCONF_MAX * 4));
4126
4127 memset(array, 0, bytes);
4128 array[DEVCONF_FORWARDING] = cnf->forwarding;
4129 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4130 array[DEVCONF_MTU6] = cnf->mtu6;
4131 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4132 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4133 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4134 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4135 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4136 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4137 jiffies_to_msecs(cnf->rtr_solicit_interval);
4138 array[DEVCONF_RTR_SOLICIT_DELAY] =
4139 jiffies_to_msecs(cnf->rtr_solicit_delay);
4140 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4141 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4142 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4143 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4144 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4145 #ifdef CONFIG_IPV6_PRIVACY
4146 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4147 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4148 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4149 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4150 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4151 #endif
4152 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4153 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4154 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4155 #ifdef CONFIG_IPV6_ROUTER_PREF
4156 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4157 array[DEVCONF_RTR_PROBE_INTERVAL] =
4158 jiffies_to_msecs(cnf->rtr_probe_interval);
4159 #ifdef CONFIG_IPV6_ROUTE_INFO
4160 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4161 #endif
4162 #endif
4163 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4164 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4165 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4166 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4167 #endif
4168 #ifdef CONFIG_IPV6_MROUTE
4169 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4170 #endif
4171 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4172 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4173 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4174 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4175 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4176 }
4177
4178 static inline size_t inet6_ifla6_size(void)
4179 {
4180 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4181 + nla_total_size(sizeof(struct ifla_cacheinfo))
4182 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4183 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4184 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4185 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4186 }
4187
4188 static inline size_t inet6_if_nlmsg_size(void)
4189 {
4190 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4191 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4192 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4193 + nla_total_size(4) /* IFLA_MTU */
4194 + nla_total_size(4) /* IFLA_LINK */
4195 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4196 }
4197
4198 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4199 int items, int bytes)
4200 {
4201 int i;
4202 int pad = bytes - sizeof(u64) * items;
4203 BUG_ON(pad < 0);
4204
4205 /* Use put_unaligned() because stats may not be aligned for u64. */
4206 put_unaligned(items, &stats[0]);
4207 for (i = 1; i < items; i++)
4208 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4209
4210 memset(&stats[items], 0, pad);
4211 }
4212
4213 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4214 int items, int bytes, size_t syncpoff)
4215 {
4216 int i;
4217 int pad = bytes - sizeof(u64) * items;
4218 BUG_ON(pad < 0);
4219
4220 /* Use put_unaligned() because stats may not be aligned for u64. */
4221 put_unaligned(items, &stats[0]);
4222 for (i = 1; i < items; i++)
4223 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4224
4225 memset(&stats[items], 0, pad);
4226 }
4227
4228 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4229 int bytes)
4230 {
4231 switch (attrtype) {
4232 case IFLA_INET6_STATS:
4233 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4234 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4235 break;
4236 case IFLA_INET6_ICMP6STATS:
4237 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4238 break;
4239 }
4240 }
4241
4242 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4243 {
4244 struct nlattr *nla;
4245 struct ifla_cacheinfo ci;
4246
4247 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4248 goto nla_put_failure;
4249 ci.max_reasm_len = IPV6_MAXPLEN;
4250 ci.tstamp = cstamp_delta(idev->tstamp);
4251 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4252 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4253 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4254 goto nla_put_failure;
4255 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4256 if (nla == NULL)
4257 goto nla_put_failure;
4258 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4259
4260 /* XXX - MC not implemented */
4261
4262 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4263 if (nla == NULL)
4264 goto nla_put_failure;
4265 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4266
4267 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4268 if (nla == NULL)
4269 goto nla_put_failure;
4270 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4271
4272 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4273 if (nla == NULL)
4274 goto nla_put_failure;
4275 read_lock_bh(&idev->lock);
4276 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4277 read_unlock_bh(&idev->lock);
4278
4279 return 0;
4280
4281 nla_put_failure:
4282 return -EMSGSIZE;
4283 }
4284
4285 static size_t inet6_get_link_af_size(const struct net_device *dev)
4286 {
4287 if (!__in6_dev_get(dev))
4288 return 0;
4289
4290 return inet6_ifla6_size();
4291 }
4292
4293 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4294 {
4295 struct inet6_dev *idev = __in6_dev_get(dev);
4296
4297 if (!idev)
4298 return -ENODATA;
4299
4300 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4301 return -EMSGSIZE;
4302
4303 return 0;
4304 }
4305
4306 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4307 {
4308 struct inet6_ifaddr *ifp;
4309 struct net_device *dev = idev->dev;
4310 bool update_rs = false;
4311 struct in6_addr ll_addr;
4312
4313 if (token == NULL)
4314 return -EINVAL;
4315 if (ipv6_addr_any(token))
4316 return -EINVAL;
4317 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4318 return -EINVAL;
4319 if (!ipv6_accept_ra(idev))
4320 return -EINVAL;
4321 if (idev->cnf.rtr_solicits <= 0)
4322 return -EINVAL;
4323
4324 write_lock_bh(&idev->lock);
4325
4326 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4327 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4328
4329 write_unlock_bh(&idev->lock);
4330
4331 if (!idev->dead && (idev->if_flags & IF_READY) &&
4332 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4333 IFA_F_OPTIMISTIC)) {
4334
4335 /* If we're not ready, then normal ifup will take care
4336 * of this. Otherwise, we need to request our rs here.
4337 */
4338 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4339 update_rs = true;
4340 }
4341
4342 write_lock_bh(&idev->lock);
4343
4344 if (update_rs) {
4345 idev->if_flags |= IF_RS_SENT;
4346 idev->rs_probes = 1;
4347 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4348 }
4349
4350 /* Well, that's kinda nasty ... */
4351 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4352 spin_lock(&ifp->lock);
4353 if (ifp->tokenized) {
4354 ifp->valid_lft = 0;
4355 ifp->prefered_lft = 0;
4356 }
4357 spin_unlock(&ifp->lock);
4358 }
4359
4360 write_unlock_bh(&idev->lock);
4361 addrconf_verify(0);
4362 return 0;
4363 }
4364
4365 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4366 {
4367 int err = -EINVAL;
4368 struct inet6_dev *idev = __in6_dev_get(dev);
4369 struct nlattr *tb[IFLA_INET6_MAX + 1];
4370
4371 if (!idev)
4372 return -EAFNOSUPPORT;
4373
4374 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4375 BUG();
4376
4377 if (tb[IFLA_INET6_TOKEN])
4378 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4379
4380 return err;
4381 }
4382
4383 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4384 u32 portid, u32 seq, int event, unsigned int flags)
4385 {
4386 struct net_device *dev = idev->dev;
4387 struct ifinfomsg *hdr;
4388 struct nlmsghdr *nlh;
4389 void *protoinfo;
4390
4391 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4392 if (nlh == NULL)
4393 return -EMSGSIZE;
4394
4395 hdr = nlmsg_data(nlh);
4396 hdr->ifi_family = AF_INET6;
4397 hdr->__ifi_pad = 0;
4398 hdr->ifi_type = dev->type;
4399 hdr->ifi_index = dev->ifindex;
4400 hdr->ifi_flags = dev_get_flags(dev);
4401 hdr->ifi_change = 0;
4402
4403 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4404 (dev->addr_len &&
4405 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4406 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4407 (dev->ifindex != dev->iflink &&
4408 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4409 goto nla_put_failure;
4410 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4411 if (protoinfo == NULL)
4412 goto nla_put_failure;
4413
4414 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4415 goto nla_put_failure;
4416
4417 nla_nest_end(skb, protoinfo);
4418 return nlmsg_end(skb, nlh);
4419
4420 nla_put_failure:
4421 nlmsg_cancel(skb, nlh);
4422 return -EMSGSIZE;
4423 }
4424
4425 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4426 {
4427 struct net *net = sock_net(skb->sk);
4428 int h, s_h;
4429 int idx = 0, s_idx;
4430 struct net_device *dev;
4431 struct inet6_dev *idev;
4432 struct hlist_head *head;
4433
4434 s_h = cb->args[0];
4435 s_idx = cb->args[1];
4436
4437 rcu_read_lock();
4438 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4439 idx = 0;
4440 head = &net->dev_index_head[h];
4441 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4442 if (idx < s_idx)
4443 goto cont;
4444 idev = __in6_dev_get(dev);
4445 if (!idev)
4446 goto cont;
4447 if (inet6_fill_ifinfo(skb, idev,
4448 NETLINK_CB(cb->skb).portid,
4449 cb->nlh->nlmsg_seq,
4450 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4451 goto out;
4452 cont:
4453 idx++;
4454 }
4455 }
4456 out:
4457 rcu_read_unlock();
4458 cb->args[1] = idx;
4459 cb->args[0] = h;
4460
4461 return skb->len;
4462 }
4463
4464 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4465 {
4466 struct sk_buff *skb;
4467 struct net *net = dev_net(idev->dev);
4468 int err = -ENOBUFS;
4469
4470 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4471 if (skb == NULL)
4472 goto errout;
4473
4474 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4475 if (err < 0) {
4476 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4477 WARN_ON(err == -EMSGSIZE);
4478 kfree_skb(skb);
4479 goto errout;
4480 }
4481 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4482 return;
4483 errout:
4484 if (err < 0)
4485 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4486 }
4487
4488 static inline size_t inet6_prefix_nlmsg_size(void)
4489 {
4490 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4491 + nla_total_size(sizeof(struct in6_addr))
4492 + nla_total_size(sizeof(struct prefix_cacheinfo));
4493 }
4494
4495 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4496 struct prefix_info *pinfo, u32 portid, u32 seq,
4497 int event, unsigned int flags)
4498 {
4499 struct prefixmsg *pmsg;
4500 struct nlmsghdr *nlh;
4501 struct prefix_cacheinfo ci;
4502
4503 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4504 if (nlh == NULL)
4505 return -EMSGSIZE;
4506
4507 pmsg = nlmsg_data(nlh);
4508 pmsg->prefix_family = AF_INET6;
4509 pmsg->prefix_pad1 = 0;
4510 pmsg->prefix_pad2 = 0;
4511 pmsg->prefix_ifindex = idev->dev->ifindex;
4512 pmsg->prefix_len = pinfo->prefix_len;
4513 pmsg->prefix_type = pinfo->type;
4514 pmsg->prefix_pad3 = 0;
4515 pmsg->prefix_flags = 0;
4516 if (pinfo->onlink)
4517 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4518 if (pinfo->autoconf)
4519 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4520
4521 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4522 goto nla_put_failure;
4523 ci.preferred_time = ntohl(pinfo->prefered);
4524 ci.valid_time = ntohl(pinfo->valid);
4525 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4526 goto nla_put_failure;
4527 return nlmsg_end(skb, nlh);
4528
4529 nla_put_failure:
4530 nlmsg_cancel(skb, nlh);
4531 return -EMSGSIZE;
4532 }
4533
4534 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4535 struct prefix_info *pinfo)
4536 {
4537 struct sk_buff *skb;
4538 struct net *net = dev_net(idev->dev);
4539 int err = -ENOBUFS;
4540
4541 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4542 if (skb == NULL)
4543 goto errout;
4544
4545 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4546 if (err < 0) {
4547 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4548 WARN_ON(err == -EMSGSIZE);
4549 kfree_skb(skb);
4550 goto errout;
4551 }
4552 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4553 return;
4554 errout:
4555 if (err < 0)
4556 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4557 }
4558
4559 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4560 {
4561 write_lock_bh(&ifp->idev->lock);
4562 spin_lock(&ifp->lock);
4563 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4564 IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4565 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4566 ifp->idev->valid_ll_addr_cnt += count;
4567 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4568 spin_unlock(&ifp->lock);
4569 write_unlock_bh(&ifp->idev->lock);
4570 }
4571
4572 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4573 {
4574 struct net *net = dev_net(ifp->idev->dev);
4575
4576 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4577
4578 switch (event) {
4579 case RTM_NEWADDR:
4580 update_valid_ll_addr_cnt(ifp, 1);
4581
4582 /*
4583 * If the address was optimistic
4584 * we inserted the route at the start of
4585 * our DAD process, so we don't need
4586 * to do it again
4587 */
4588 if (!(ifp->rt->rt6i_node))
4589 ip6_ins_rt(ifp->rt);
4590 if (ifp->idev->cnf.forwarding)
4591 addrconf_join_anycast(ifp);
4592 if (!ipv6_addr_any(&ifp->peer_addr))
4593 addrconf_prefix_route(&ifp->peer_addr, 128,
4594 ifp->idev->dev, 0, 0);
4595 break;
4596 case RTM_DELADDR:
4597 update_valid_ll_addr_cnt(ifp, -1);
4598
4599 if (ifp->idev->cnf.forwarding)
4600 addrconf_leave_anycast(ifp);
4601 addrconf_leave_solict(ifp->idev, &ifp->addr);
4602 if (!ipv6_addr_any(&ifp->peer_addr)) {
4603 struct rt6_info *rt;
4604 struct net_device *dev = ifp->idev->dev;
4605
4606 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4607 dev->ifindex, 1);
4608 if (rt) {
4609 dst_hold(&rt->dst);
4610 if (ip6_del_rt(rt))
4611 dst_free(&rt->dst);
4612 }
4613 }
4614 dst_hold(&ifp->rt->dst);
4615
4616 if (ip6_del_rt(ifp->rt))
4617 dst_free(&ifp->rt->dst);
4618 break;
4619 }
4620 atomic_inc(&net->ipv6.dev_addr_genid);
4621 rt_genid_bump_ipv6(net);
4622 }
4623
4624 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4625 {
4626 rcu_read_lock_bh();
4627 if (likely(ifp->idev->dead == 0))
4628 __ipv6_ifa_notify(event, ifp);
4629 rcu_read_unlock_bh();
4630 }
4631
4632 #ifdef CONFIG_SYSCTL
4633
4634 static
4635 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4636 void __user *buffer, size_t *lenp, loff_t *ppos)
4637 {
4638 int *valp = ctl->data;
4639 int val = *valp;
4640 loff_t pos = *ppos;
4641 struct ctl_table lctl;
4642 int ret;
4643
4644 /*
4645 * ctl->data points to idev->cnf.forwarding, we should
4646 * not modify it until we get the rtnl lock.
4647 */
4648 lctl = *ctl;
4649 lctl.data = &val;
4650
4651 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4652
4653 if (write)
4654 ret = addrconf_fixup_forwarding(ctl, valp, val);
4655 if (ret)
4656 *ppos = pos;
4657 return ret;
4658 }
4659
4660 static void dev_disable_change(struct inet6_dev *idev)
4661 {
4662 struct netdev_notifier_info info;
4663
4664 if (!idev || !idev->dev)
4665 return;
4666
4667 netdev_notifier_info_init(&info, idev->dev);
4668 if (idev->cnf.disable_ipv6)
4669 addrconf_notify(NULL, NETDEV_DOWN, &info);
4670 else
4671 addrconf_notify(NULL, NETDEV_UP, &info);
4672 }
4673
4674 static void addrconf_disable_change(struct net *net, __s32 newf)
4675 {
4676 struct net_device *dev;
4677 struct inet6_dev *idev;
4678
4679 rcu_read_lock();
4680 for_each_netdev_rcu(net, dev) {
4681 idev = __in6_dev_get(dev);
4682 if (idev) {
4683 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4684 idev->cnf.disable_ipv6 = newf;
4685 if (changed)
4686 dev_disable_change(idev);
4687 }
4688 }
4689 rcu_read_unlock();
4690 }
4691
4692 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4693 {
4694 struct net *net;
4695 int old;
4696
4697 if (!rtnl_trylock())
4698 return restart_syscall();
4699
4700 net = (struct net *)table->extra2;
4701 old = *p;
4702 *p = newf;
4703
4704 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4705 rtnl_unlock();
4706 return 0;
4707 }
4708
4709 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4710 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4711 addrconf_disable_change(net, newf);
4712 } else if ((!newf) ^ (!old))
4713 dev_disable_change((struct inet6_dev *)table->extra1);
4714
4715 rtnl_unlock();
4716 return 0;
4717 }
4718
4719 static
4720 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4721 void __user *buffer, size_t *lenp, loff_t *ppos)
4722 {
4723 int *valp = ctl->data;
4724 int val = *valp;
4725 loff_t pos = *ppos;
4726 struct ctl_table lctl;
4727 int ret;
4728
4729 /*
4730 * ctl->data points to idev->cnf.disable_ipv6, we should
4731 * not modify it until we get the rtnl lock.
4732 */
4733 lctl = *ctl;
4734 lctl.data = &val;
4735
4736 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4737
4738 if (write)
4739 ret = addrconf_disable_ipv6(ctl, valp, val);
4740 if (ret)
4741 *ppos = pos;
4742 return ret;
4743 }
4744
4745 static struct addrconf_sysctl_table
4746 {
4747 struct ctl_table_header *sysctl_header;
4748 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4749 } addrconf_sysctl __read_mostly = {
4750 .sysctl_header = NULL,
4751 .addrconf_vars = {
4752 {
4753 .procname = "forwarding",
4754 .data = &ipv6_devconf.forwarding,
4755 .maxlen = sizeof(int),
4756 .mode = 0644,
4757 .proc_handler = addrconf_sysctl_forward,
4758 },
4759 {
4760 .procname = "hop_limit",
4761 .data = &ipv6_devconf.hop_limit,
4762 .maxlen = sizeof(int),
4763 .mode = 0644,
4764 .proc_handler = proc_dointvec,
4765 },
4766 {
4767 .procname = "mtu",
4768 .data = &ipv6_devconf.mtu6,
4769 .maxlen = sizeof(int),
4770 .mode = 0644,
4771 .proc_handler = proc_dointvec,
4772 },
4773 {
4774 .procname = "accept_ra",
4775 .data = &ipv6_devconf.accept_ra,
4776 .maxlen = sizeof(int),
4777 .mode = 0644,
4778 .proc_handler = proc_dointvec,
4779 },
4780 {
4781 .procname = "accept_redirects",
4782 .data = &ipv6_devconf.accept_redirects,
4783 .maxlen = sizeof(int),
4784 .mode = 0644,
4785 .proc_handler = proc_dointvec,
4786 },
4787 {
4788 .procname = "autoconf",
4789 .data = &ipv6_devconf.autoconf,
4790 .maxlen = sizeof(int),
4791 .mode = 0644,
4792 .proc_handler = proc_dointvec,
4793 },
4794 {
4795 .procname = "dad_transmits",
4796 .data = &ipv6_devconf.dad_transmits,
4797 .maxlen = sizeof(int),
4798 .mode = 0644,
4799 .proc_handler = proc_dointvec,
4800 },
4801 {
4802 .procname = "router_solicitations",
4803 .data = &ipv6_devconf.rtr_solicits,
4804 .maxlen = sizeof(int),
4805 .mode = 0644,
4806 .proc_handler = proc_dointvec,
4807 },
4808 {
4809 .procname = "router_solicitation_interval",
4810 .data = &ipv6_devconf.rtr_solicit_interval,
4811 .maxlen = sizeof(int),
4812 .mode = 0644,
4813 .proc_handler = proc_dointvec_jiffies,
4814 },
4815 {
4816 .procname = "router_solicitation_delay",
4817 .data = &ipv6_devconf.rtr_solicit_delay,
4818 .maxlen = sizeof(int),
4819 .mode = 0644,
4820 .proc_handler = proc_dointvec_jiffies,
4821 },
4822 {
4823 .procname = "force_mld_version",
4824 .data = &ipv6_devconf.force_mld_version,
4825 .maxlen = sizeof(int),
4826 .mode = 0644,
4827 .proc_handler = proc_dointvec,
4828 },
4829 {
4830 .procname = "mldv1_unsolicited_report_interval",
4831 .data =
4832 &ipv6_devconf.mldv1_unsolicited_report_interval,
4833 .maxlen = sizeof(int),
4834 .mode = 0644,
4835 .proc_handler = proc_dointvec_ms_jiffies,
4836 },
4837 {
4838 .procname = "mldv2_unsolicited_report_interval",
4839 .data =
4840 &ipv6_devconf.mldv2_unsolicited_report_interval,
4841 .maxlen = sizeof(int),
4842 .mode = 0644,
4843 .proc_handler = proc_dointvec_ms_jiffies,
4844 },
4845 #ifdef CONFIG_IPV6_PRIVACY
4846 {
4847 .procname = "use_tempaddr",
4848 .data = &ipv6_devconf.use_tempaddr,
4849 .maxlen = sizeof(int),
4850 .mode = 0644,
4851 .proc_handler = proc_dointvec,
4852 },
4853 {
4854 .procname = "temp_valid_lft",
4855 .data = &ipv6_devconf.temp_valid_lft,
4856 .maxlen = sizeof(int),
4857 .mode = 0644,
4858 .proc_handler = proc_dointvec,
4859 },
4860 {
4861 .procname = "temp_prefered_lft",
4862 .data = &ipv6_devconf.temp_prefered_lft,
4863 .maxlen = sizeof(int),
4864 .mode = 0644,
4865 .proc_handler = proc_dointvec,
4866 },
4867 {
4868 .procname = "regen_max_retry",
4869 .data = &ipv6_devconf.regen_max_retry,
4870 .maxlen = sizeof(int),
4871 .mode = 0644,
4872 .proc_handler = proc_dointvec,
4873 },
4874 {
4875 .procname = "max_desync_factor",
4876 .data = &ipv6_devconf.max_desync_factor,
4877 .maxlen = sizeof(int),
4878 .mode = 0644,
4879 .proc_handler = proc_dointvec,
4880 },
4881 #endif
4882 {
4883 .procname = "max_addresses",
4884 .data = &ipv6_devconf.max_addresses,
4885 .maxlen = sizeof(int),
4886 .mode = 0644,
4887 .proc_handler = proc_dointvec,
4888 },
4889 {
4890 .procname = "accept_ra_defrtr",
4891 .data = &ipv6_devconf.accept_ra_defrtr,
4892 .maxlen = sizeof(int),
4893 .mode = 0644,
4894 .proc_handler = proc_dointvec,
4895 },
4896 {
4897 .procname = "accept_ra_pinfo",
4898 .data = &ipv6_devconf.accept_ra_pinfo,
4899 .maxlen = sizeof(int),
4900 .mode = 0644,
4901 .proc_handler = proc_dointvec,
4902 },
4903 #ifdef CONFIG_IPV6_ROUTER_PREF
4904 {
4905 .procname = "accept_ra_rtr_pref",
4906 .data = &ipv6_devconf.accept_ra_rtr_pref,
4907 .maxlen = sizeof(int),
4908 .mode = 0644,
4909 .proc_handler = proc_dointvec,
4910 },
4911 {
4912 .procname = "router_probe_interval",
4913 .data = &ipv6_devconf.rtr_probe_interval,
4914 .maxlen = sizeof(int),
4915 .mode = 0644,
4916 .proc_handler = proc_dointvec_jiffies,
4917 },
4918 #ifdef CONFIG_IPV6_ROUTE_INFO
4919 {
4920 .procname = "accept_ra_rt_info_max_plen",
4921 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4922 .maxlen = sizeof(int),
4923 .mode = 0644,
4924 .proc_handler = proc_dointvec,
4925 },
4926 #endif
4927 #endif
4928 {
4929 .procname = "proxy_ndp",
4930 .data = &ipv6_devconf.proxy_ndp,
4931 .maxlen = sizeof(int),
4932 .mode = 0644,
4933 .proc_handler = proc_dointvec,
4934 },
4935 {
4936 .procname = "accept_source_route",
4937 .data = &ipv6_devconf.accept_source_route,
4938 .maxlen = sizeof(int),
4939 .mode = 0644,
4940 .proc_handler = proc_dointvec,
4941 },
4942 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4943 {
4944 .procname = "optimistic_dad",
4945 .data = &ipv6_devconf.optimistic_dad,
4946 .maxlen = sizeof(int),
4947 .mode = 0644,
4948 .proc_handler = proc_dointvec,
4949
4950 },
4951 #endif
4952 #ifdef CONFIG_IPV6_MROUTE
4953 {
4954 .procname = "mc_forwarding",
4955 .data = &ipv6_devconf.mc_forwarding,
4956 .maxlen = sizeof(int),
4957 .mode = 0444,
4958 .proc_handler = proc_dointvec,
4959 },
4960 #endif
4961 {
4962 .procname = "disable_ipv6",
4963 .data = &ipv6_devconf.disable_ipv6,
4964 .maxlen = sizeof(int),
4965 .mode = 0644,
4966 .proc_handler = addrconf_sysctl_disable,
4967 },
4968 {
4969 .procname = "accept_dad",
4970 .data = &ipv6_devconf.accept_dad,
4971 .maxlen = sizeof(int),
4972 .mode = 0644,
4973 .proc_handler = proc_dointvec,
4974 },
4975 {
4976 .procname = "force_tllao",
4977 .data = &ipv6_devconf.force_tllao,
4978 .maxlen = sizeof(int),
4979 .mode = 0644,
4980 .proc_handler = proc_dointvec
4981 },
4982 {
4983 .procname = "ndisc_notify",
4984 .data = &ipv6_devconf.ndisc_notify,
4985 .maxlen = sizeof(int),
4986 .mode = 0644,
4987 .proc_handler = proc_dointvec
4988 },
4989 {
4990 .procname = "suppress_frag_ndisc",
4991 .data = &ipv6_devconf.suppress_frag_ndisc,
4992 .maxlen = sizeof(int),
4993 .mode = 0644,
4994 .proc_handler = proc_dointvec
4995 },
4996 {
4997 /* sentinel */
4998 }
4999 },
5000 };
5001
5002 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5003 struct inet6_dev *idev, struct ipv6_devconf *p)
5004 {
5005 int i;
5006 struct addrconf_sysctl_table *t;
5007 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5008
5009 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5010 if (t == NULL)
5011 goto out;
5012
5013 for (i = 0; t->addrconf_vars[i].data; i++) {
5014 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5015 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5016 t->addrconf_vars[i].extra2 = net;
5017 }
5018
5019 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5020
5021 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5022 if (t->sysctl_header == NULL)
5023 goto free;
5024
5025 p->sysctl = t;
5026 return 0;
5027
5028 free:
5029 kfree(t);
5030 out:
5031 return -ENOBUFS;
5032 }
5033
5034 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5035 {
5036 struct addrconf_sysctl_table *t;
5037
5038 if (p->sysctl == NULL)
5039 return;
5040
5041 t = p->sysctl;
5042 p->sysctl = NULL;
5043 unregister_net_sysctl_table(t->sysctl_header);
5044 kfree(t);
5045 }
5046
5047 static void addrconf_sysctl_register(struct inet6_dev *idev)
5048 {
5049 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
5050 &ndisc_ifinfo_sysctl_change);
5051 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5052 idev, &idev->cnf);
5053 }
5054
5055 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5056 {
5057 __addrconf_sysctl_unregister(&idev->cnf);
5058 neigh_sysctl_unregister(idev->nd_parms);
5059 }
5060
5061
5062 #endif
5063
5064 static int __net_init addrconf_init_net(struct net *net)
5065 {
5066 int err = -ENOMEM;
5067 struct ipv6_devconf *all, *dflt;
5068
5069 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5070 if (all == NULL)
5071 goto err_alloc_all;
5072
5073 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5074 if (dflt == NULL)
5075 goto err_alloc_dflt;
5076
5077 /* these will be inherited by all namespaces */
5078 dflt->autoconf = ipv6_defaults.autoconf;
5079 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5080
5081 net->ipv6.devconf_all = all;
5082 net->ipv6.devconf_dflt = dflt;
5083
5084 #ifdef CONFIG_SYSCTL
5085 err = __addrconf_sysctl_register(net, "all", NULL, all);
5086 if (err < 0)
5087 goto err_reg_all;
5088
5089 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5090 if (err < 0)
5091 goto err_reg_dflt;
5092 #endif
5093 return 0;
5094
5095 #ifdef CONFIG_SYSCTL
5096 err_reg_dflt:
5097 __addrconf_sysctl_unregister(all);
5098 err_reg_all:
5099 kfree(dflt);
5100 #endif
5101 err_alloc_dflt:
5102 kfree(all);
5103 err_alloc_all:
5104 return err;
5105 }
5106
5107 static void __net_exit addrconf_exit_net(struct net *net)
5108 {
5109 #ifdef CONFIG_SYSCTL
5110 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5111 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5112 #endif
5113 if (!net_eq(net, &init_net)) {
5114 kfree(net->ipv6.devconf_dflt);
5115 kfree(net->ipv6.devconf_all);
5116 }
5117 }
5118
5119 static struct pernet_operations addrconf_ops = {
5120 .init = addrconf_init_net,
5121 .exit = addrconf_exit_net,
5122 };
5123
5124 static struct rtnl_af_ops inet6_ops = {
5125 .family = AF_INET6,
5126 .fill_link_af = inet6_fill_link_af,
5127 .get_link_af_size = inet6_get_link_af_size,
5128 .set_link_af = inet6_set_link_af,
5129 };
5130
5131 /*
5132 * Init / cleanup code
5133 */
5134
5135 int __init addrconf_init(void)
5136 {
5137 int i, err;
5138
5139 err = ipv6_addr_label_init();
5140 if (err < 0) {
5141 pr_crit("%s: cannot initialize default policy table: %d\n",
5142 __func__, err);
5143 goto out;
5144 }
5145
5146 err = register_pernet_subsys(&addrconf_ops);
5147 if (err < 0)
5148 goto out_addrlabel;
5149
5150 /* The addrconf netdev notifier requires that loopback_dev
5151 * has it's ipv6 private information allocated and setup
5152 * before it can bring up and give link-local addresses
5153 * to other devices which are up.
5154 *
5155 * Unfortunately, loopback_dev is not necessarily the first
5156 * entry in the global dev_base list of net devices. In fact,
5157 * it is likely to be the very last entry on that list.
5158 * So this causes the notifier registry below to try and
5159 * give link-local addresses to all devices besides loopback_dev
5160 * first, then loopback_dev, which cases all the non-loopback_dev
5161 * devices to fail to get a link-local address.
5162 *
5163 * So, as a temporary fix, allocate the ipv6 structure for
5164 * loopback_dev first by hand.
5165 * Longer term, all of the dependencies ipv6 has upon the loopback
5166 * device and it being up should be removed.
5167 */
5168 rtnl_lock();
5169 if (!ipv6_add_dev(init_net.loopback_dev))
5170 err = -ENOMEM;
5171 rtnl_unlock();
5172 if (err)
5173 goto errlo;
5174
5175 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5176 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5177
5178 register_netdevice_notifier(&ipv6_dev_notf);
5179
5180 addrconf_verify(0);
5181
5182 err = rtnl_af_register(&inet6_ops);
5183 if (err < 0)
5184 goto errout_af;
5185
5186 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5187 NULL);
5188 if (err < 0)
5189 goto errout;
5190
5191 /* Only the first call to __rtnl_register can fail */
5192 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5193 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5194 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5195 inet6_dump_ifaddr, NULL);
5196 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5197 inet6_dump_ifmcaddr, NULL);
5198 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5199 inet6_dump_ifacaddr, NULL);
5200 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5201 inet6_netconf_dump_devconf, NULL);
5202
5203 ipv6_addr_label_rtnl_register();
5204
5205 return 0;
5206 errout:
5207 rtnl_af_unregister(&inet6_ops);
5208 errout_af:
5209 unregister_netdevice_notifier(&ipv6_dev_notf);
5210 errlo:
5211 unregister_pernet_subsys(&addrconf_ops);
5212 out_addrlabel:
5213 ipv6_addr_label_cleanup();
5214 out:
5215 return err;
5216 }
5217
5218 void addrconf_cleanup(void)
5219 {
5220 struct net_device *dev;
5221 int i;
5222
5223 unregister_netdevice_notifier(&ipv6_dev_notf);
5224 unregister_pernet_subsys(&addrconf_ops);
5225 ipv6_addr_label_cleanup();
5226
5227 rtnl_lock();
5228
5229 __rtnl_af_unregister(&inet6_ops);
5230
5231 /* clean dev list */
5232 for_each_netdev(&init_net, dev) {
5233 if (__in6_dev_get(dev) == NULL)
5234 continue;
5235 addrconf_ifdown(dev, 1);
5236 }
5237 addrconf_ifdown(init_net.loopback_dev, 2);
5238
5239 /*
5240 * Check hash table.
5241 */
5242 spin_lock_bh(&addrconf_hash_lock);
5243 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5244 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5245 spin_unlock_bh(&addrconf_hash_lock);
5246
5247 del_timer(&addr_chk_timer);
5248 rtnl_unlock();
5249 }
Linux kernel - Deliverables
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