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Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-artful-kernel.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/in6.h>
50 #include <linux/netdevice.h>
51 #include <linux/if_addr.h>
52 #include <linux/if_arp.h>
53 #include <linux/if_arcnet.h>
54 #include <linux/if_infiniband.h>
55 #include <linux/route.h>
56 #include <linux/inetdevice.h>
57 #include <linux/init.h>
58 #include <linux/slab.h>
59 #ifdef CONFIG_SYSCTL
60 #include <linux/sysctl.h>
61 #endif
62 #include <linux/capability.h>
63 #include <linux/delay.h>
64 #include <linux/notifier.h>
65 #include <linux/string.h>
66 #include <linux/hash.h>
67
68 #include <net/net_namespace.h>
69 #include <net/sock.h>
70 #include <net/snmp.h>
71
72 #include <net/af_ieee802154.h>
73 #include <net/firewire.h>
74 #include <net/ipv6.h>
75 #include <net/protocol.h>
76 #include <net/ndisc.h>
77 #include <net/ip6_route.h>
78 #include <net/addrconf.h>
79 #include <net/tcp.h>
80 #include <net/ip.h>
81 #include <net/netlink.h>
82 #include <net/pkt_sched.h>
83 #include <linux/if_tunnel.h>
84 #include <linux/rtnetlink.h>
85 #include <linux/netconf.h>
86 #include <linux/random.h>
87 #include <linux/uaccess.h>
88 #include <asm/unaligned.h>
89
90 #include <linux/proc_fs.h>
91 #include <linux/seq_file.h>
92 #include <linux/export.h>
93
94 /* Set to 3 to get tracing... */
95 #define ACONF_DEBUG 2
96
97 #if ACONF_DEBUG >= 3
98 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
99 #else
100 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
101 #endif
102
103 #define INFINITY_LIFE_TIME 0xFFFFFFFF
104
105 static inline u32 cstamp_delta(unsigned long cstamp)
106 {
107 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
108 }
109
110 #ifdef CONFIG_SYSCTL
111 static void addrconf_sysctl_register(struct inet6_dev *idev);
112 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
113 #else
114 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
115 {
116 }
117
118 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
119 {
120 }
121 #endif
122
123 static void __ipv6_regen_rndid(struct inet6_dev *idev);
124 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
125 static void ipv6_regen_rndid(unsigned long data);
126
127 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
128 static int ipv6_count_addresses(struct inet6_dev *idev);
129
130 /*
131 * Configured unicast address hash table
132 */
133 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
134 static DEFINE_SPINLOCK(addrconf_hash_lock);
135
136 static void addrconf_verify(unsigned long);
137
138 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
139 static DEFINE_SPINLOCK(addrconf_verify_lock);
140
141 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
142 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
143
144 static void addrconf_type_change(struct net_device *dev,
145 unsigned long event);
146 static int addrconf_ifdown(struct net_device *dev, int how);
147
148 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
149 int plen,
150 const struct net_device *dev,
151 u32 flags, u32 noflags);
152
153 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
154 static void addrconf_dad_timer(unsigned long data);
155 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
156 static void addrconf_dad_run(struct inet6_dev *idev);
157 static void addrconf_rs_timer(unsigned long data);
158 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
159 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
160
161 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
162 struct prefix_info *pinfo);
163 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
164 struct net_device *dev);
165
166 static struct ipv6_devconf ipv6_devconf __read_mostly = {
167 .forwarding = 0,
168 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
169 .mtu6 = IPV6_MIN_MTU,
170 .accept_ra = 1,
171 .accept_redirects = 1,
172 .autoconf = 1,
173 .force_mld_version = 0,
174 .mldv1_unsolicited_report_interval = 10 * HZ,
175 .mldv2_unsolicited_report_interval = HZ,
176 .dad_transmits = 1,
177 .rtr_solicits = MAX_RTR_SOLICITATIONS,
178 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
179 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
180 .use_tempaddr = 0,
181 .temp_valid_lft = TEMP_VALID_LIFETIME,
182 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
183 .regen_max_retry = REGEN_MAX_RETRY,
184 .max_desync_factor = MAX_DESYNC_FACTOR,
185 .max_addresses = IPV6_MAX_ADDRESSES,
186 .accept_ra_defrtr = 1,
187 .accept_ra_pinfo = 1,
188 #ifdef CONFIG_IPV6_ROUTER_PREF
189 .accept_ra_rtr_pref = 1,
190 .rtr_probe_interval = 60 * HZ,
191 #ifdef CONFIG_IPV6_ROUTE_INFO
192 .accept_ra_rt_info_max_plen = 0,
193 #endif
194 #endif
195 .proxy_ndp = 0,
196 .accept_source_route = 0, /* we do not accept RH0 by default. */
197 .disable_ipv6 = 0,
198 .accept_dad = 1,
199 .suppress_frag_ndisc = 1,
200 };
201
202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
203 .forwarding = 0,
204 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
205 .mtu6 = IPV6_MIN_MTU,
206 .accept_ra = 1,
207 .accept_redirects = 1,
208 .autoconf = 1,
209 .force_mld_version = 0,
210 .mldv1_unsolicited_report_interval = 10 * HZ,
211 .mldv2_unsolicited_report_interval = HZ,
212 .dad_transmits = 1,
213 .rtr_solicits = MAX_RTR_SOLICITATIONS,
214 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
215 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
216 .use_tempaddr = 0,
217 .temp_valid_lft = TEMP_VALID_LIFETIME,
218 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
219 .regen_max_retry = REGEN_MAX_RETRY,
220 .max_desync_factor = MAX_DESYNC_FACTOR,
221 .max_addresses = IPV6_MAX_ADDRESSES,
222 .accept_ra_defrtr = 1,
223 .accept_ra_pinfo = 1,
224 #ifdef CONFIG_IPV6_ROUTER_PREF
225 .accept_ra_rtr_pref = 1,
226 .rtr_probe_interval = 60 * HZ,
227 #ifdef CONFIG_IPV6_ROUTE_INFO
228 .accept_ra_rt_info_max_plen = 0,
229 #endif
230 #endif
231 .proxy_ndp = 0,
232 .accept_source_route = 0, /* we do not accept RH0 by default. */
233 .disable_ipv6 = 0,
234 .accept_dad = 1,
235 .suppress_frag_ndisc = 1,
236 };
237
238 /* Check if a valid qdisc is available */
239 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
240 {
241 return !qdisc_tx_is_noop(dev);
242 }
243
244 static void addrconf_del_rs_timer(struct inet6_dev *idev)
245 {
246 if (del_timer(&idev->rs_timer))
247 __in6_dev_put(idev);
248 }
249
250 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
251 {
252 if (del_timer(&ifp->dad_timer))
253 __in6_ifa_put(ifp);
254 }
255
256 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
257 unsigned long when)
258 {
259 if (!timer_pending(&idev->rs_timer))
260 in6_dev_hold(idev);
261 mod_timer(&idev->rs_timer, jiffies + when);
262 }
263
264 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
265 unsigned long when)
266 {
267 if (!timer_pending(&ifp->dad_timer))
268 in6_ifa_hold(ifp);
269 mod_timer(&ifp->dad_timer, jiffies + when);
270 }
271
272 static int snmp6_alloc_dev(struct inet6_dev *idev)
273 {
274 int i;
275
276 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
277 sizeof(struct ipstats_mib),
278 __alignof__(struct ipstats_mib)) < 0)
279 goto err_ip;
280
281 for_each_possible_cpu(i) {
282 struct ipstats_mib *addrconf_stats;
283 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[0], i);
284 u64_stats_init(&addrconf_stats->syncp);
285 #if SNMP_ARRAY_SZ == 2
286 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[1], i);
287 u64_stats_init(&addrconf_stats->syncp);
288 #endif
289 }
290
291
292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
293 GFP_KERNEL);
294 if (!idev->stats.icmpv6dev)
295 goto err_icmp;
296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
297 GFP_KERNEL);
298 if (!idev->stats.icmpv6msgdev)
299 goto err_icmpmsg;
300
301 return 0;
302
303 err_icmpmsg:
304 kfree(idev->stats.icmpv6dev);
305 err_icmp:
306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
307 err_ip:
308 return -ENOMEM;
309 }
310
311 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
312 {
313 struct inet6_dev *ndev;
314
315 ASSERT_RTNL();
316
317 if (dev->mtu < IPV6_MIN_MTU)
318 return NULL;
319
320 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
321
322 if (ndev == NULL)
323 return NULL;
324
325 rwlock_init(&ndev->lock);
326 ndev->dev = dev;
327 INIT_LIST_HEAD(&ndev->addr_list);
328 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
329 (unsigned long)ndev);
330 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
331 ndev->cnf.mtu6 = dev->mtu;
332 ndev->cnf.sysctl = NULL;
333 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
334 if (ndev->nd_parms == NULL) {
335 kfree(ndev);
336 return NULL;
337 }
338 if (ndev->cnf.forwarding)
339 dev_disable_lro(dev);
340 /* We refer to the device */
341 dev_hold(dev);
342
343 if (snmp6_alloc_dev(ndev) < 0) {
344 ADBG(KERN_WARNING
345 "%s: cannot allocate memory for statistics; dev=%s.\n",
346 __func__, dev->name);
347 neigh_parms_release(&nd_tbl, ndev->nd_parms);
348 dev_put(dev);
349 kfree(ndev);
350 return NULL;
351 }
352
353 if (snmp6_register_dev(ndev) < 0) {
354 ADBG(KERN_WARNING
355 "%s: cannot create /proc/net/dev_snmp6/%s\n",
356 __func__, dev->name);
357 neigh_parms_release(&nd_tbl, ndev->nd_parms);
358 ndev->dead = 1;
359 in6_dev_finish_destroy(ndev);
360 return NULL;
361 }
362
363 /* One reference from device. We must do this before
364 * we invoke __ipv6_regen_rndid().
365 */
366 in6_dev_hold(ndev);
367
368 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
369 ndev->cnf.accept_dad = -1;
370
371 #if IS_ENABLED(CONFIG_IPV6_SIT)
372 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
373 pr_info("%s: Disabled Multicast RS\n", dev->name);
374 ndev->cnf.rtr_solicits = 0;
375 }
376 #endif
377
378 INIT_LIST_HEAD(&ndev->tempaddr_list);
379 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
380 if ((dev->flags&IFF_LOOPBACK) ||
381 dev->type == ARPHRD_TUNNEL ||
382 dev->type == ARPHRD_TUNNEL6 ||
383 dev->type == ARPHRD_SIT ||
384 dev->type == ARPHRD_NONE) {
385 ndev->cnf.use_tempaddr = -1;
386 } else {
387 in6_dev_hold(ndev);
388 ipv6_regen_rndid((unsigned long) ndev);
389 }
390
391 ndev->token = in6addr_any;
392
393 if (netif_running(dev) && addrconf_qdisc_ok(dev))
394 ndev->if_flags |= IF_READY;
395
396 ipv6_mc_init_dev(ndev);
397 ndev->tstamp = jiffies;
398 addrconf_sysctl_register(ndev);
399 /* protected by rtnl_lock */
400 rcu_assign_pointer(dev->ip6_ptr, ndev);
401
402 /* Join interface-local all-node multicast group */
403 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
404
405 /* Join all-node multicast group */
406 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
407
408 /* Join all-router multicast group if forwarding is set */
409 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
410 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
411
412 return ndev;
413 }
414
415 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
416 {
417 struct inet6_dev *idev;
418
419 ASSERT_RTNL();
420
421 idev = __in6_dev_get(dev);
422 if (!idev) {
423 idev = ipv6_add_dev(dev);
424 if (!idev)
425 return NULL;
426 }
427
428 if (dev->flags&IFF_UP)
429 ipv6_mc_up(idev);
430 return idev;
431 }
432
433 static int inet6_netconf_msgsize_devconf(int type)
434 {
435 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
436 + nla_total_size(4); /* NETCONFA_IFINDEX */
437
438 /* type -1 is used for ALL */
439 if (type == -1 || type == NETCONFA_FORWARDING)
440 size += nla_total_size(4);
441 #ifdef CONFIG_IPV6_MROUTE
442 if (type == -1 || type == NETCONFA_MC_FORWARDING)
443 size += nla_total_size(4);
444 #endif
445 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
446 size += nla_total_size(4);
447
448 return size;
449 }
450
451 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
452 struct ipv6_devconf *devconf, u32 portid,
453 u32 seq, int event, unsigned int flags,
454 int type)
455 {
456 struct nlmsghdr *nlh;
457 struct netconfmsg *ncm;
458
459 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
460 flags);
461 if (nlh == NULL)
462 return -EMSGSIZE;
463
464 ncm = nlmsg_data(nlh);
465 ncm->ncm_family = AF_INET6;
466
467 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
468 goto nla_put_failure;
469
470 /* type -1 is used for ALL */
471 if ((type == -1 || type == NETCONFA_FORWARDING) &&
472 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
473 goto nla_put_failure;
474 #ifdef CONFIG_IPV6_MROUTE
475 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
476 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
477 devconf->mc_forwarding) < 0)
478 goto nla_put_failure;
479 #endif
480 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
481 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
482 goto nla_put_failure;
483
484 return nlmsg_end(skb, nlh);
485
486 nla_put_failure:
487 nlmsg_cancel(skb, nlh);
488 return -EMSGSIZE;
489 }
490
491 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
492 struct ipv6_devconf *devconf)
493 {
494 struct sk_buff *skb;
495 int err = -ENOBUFS;
496
497 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
498 if (skb == NULL)
499 goto errout;
500
501 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
502 RTM_NEWNETCONF, 0, type);
503 if (err < 0) {
504 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
505 WARN_ON(err == -EMSGSIZE);
506 kfree_skb(skb);
507 goto errout;
508 }
509 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
510 return;
511 errout:
512 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
513 }
514
515 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
516 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
517 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
518 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
519 };
520
521 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
522 struct nlmsghdr *nlh)
523 {
524 struct net *net = sock_net(in_skb->sk);
525 struct nlattr *tb[NETCONFA_MAX+1];
526 struct netconfmsg *ncm;
527 struct sk_buff *skb;
528 struct ipv6_devconf *devconf;
529 struct inet6_dev *in6_dev;
530 struct net_device *dev;
531 int ifindex;
532 int err;
533
534 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
535 devconf_ipv6_policy);
536 if (err < 0)
537 goto errout;
538
539 err = EINVAL;
540 if (!tb[NETCONFA_IFINDEX])
541 goto errout;
542
543 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
544 switch (ifindex) {
545 case NETCONFA_IFINDEX_ALL:
546 devconf = net->ipv6.devconf_all;
547 break;
548 case NETCONFA_IFINDEX_DEFAULT:
549 devconf = net->ipv6.devconf_dflt;
550 break;
551 default:
552 dev = __dev_get_by_index(net, ifindex);
553 if (dev == NULL)
554 goto errout;
555 in6_dev = __in6_dev_get(dev);
556 if (in6_dev == NULL)
557 goto errout;
558 devconf = &in6_dev->cnf;
559 break;
560 }
561
562 err = -ENOBUFS;
563 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
564 if (skb == NULL)
565 goto errout;
566
567 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
568 NETLINK_CB(in_skb).portid,
569 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
570 -1);
571 if (err < 0) {
572 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
573 WARN_ON(err == -EMSGSIZE);
574 kfree_skb(skb);
575 goto errout;
576 }
577 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
578 errout:
579 return err;
580 }
581
582 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
583 struct netlink_callback *cb)
584 {
585 struct net *net = sock_net(skb->sk);
586 int h, s_h;
587 int idx, s_idx;
588 struct net_device *dev;
589 struct inet6_dev *idev;
590 struct hlist_head *head;
591
592 s_h = cb->args[0];
593 s_idx = idx = cb->args[1];
594
595 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
596 idx = 0;
597 head = &net->dev_index_head[h];
598 rcu_read_lock();
599 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
600 net->dev_base_seq;
601 hlist_for_each_entry_rcu(dev, head, index_hlist) {
602 if (idx < s_idx)
603 goto cont;
604 idev = __in6_dev_get(dev);
605 if (!idev)
606 goto cont;
607
608 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
609 &idev->cnf,
610 NETLINK_CB(cb->skb).portid,
611 cb->nlh->nlmsg_seq,
612 RTM_NEWNETCONF,
613 NLM_F_MULTI,
614 -1) <= 0) {
615 rcu_read_unlock();
616 goto done;
617 }
618 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
619 cont:
620 idx++;
621 }
622 rcu_read_unlock();
623 }
624 if (h == NETDEV_HASHENTRIES) {
625 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
626 net->ipv6.devconf_all,
627 NETLINK_CB(cb->skb).portid,
628 cb->nlh->nlmsg_seq,
629 RTM_NEWNETCONF, NLM_F_MULTI,
630 -1) <= 0)
631 goto done;
632 else
633 h++;
634 }
635 if (h == NETDEV_HASHENTRIES + 1) {
636 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
637 net->ipv6.devconf_dflt,
638 NETLINK_CB(cb->skb).portid,
639 cb->nlh->nlmsg_seq,
640 RTM_NEWNETCONF, NLM_F_MULTI,
641 -1) <= 0)
642 goto done;
643 else
644 h++;
645 }
646 done:
647 cb->args[0] = h;
648 cb->args[1] = idx;
649
650 return skb->len;
651 }
652
653 #ifdef CONFIG_SYSCTL
654 static void dev_forward_change(struct inet6_dev *idev)
655 {
656 struct net_device *dev;
657 struct inet6_ifaddr *ifa;
658
659 if (!idev)
660 return;
661 dev = idev->dev;
662 if (idev->cnf.forwarding)
663 dev_disable_lro(dev);
664 if (dev->flags & IFF_MULTICAST) {
665 if (idev->cnf.forwarding) {
666 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
667 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
668 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
669 } else {
670 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
671 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
672 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
673 }
674 }
675
676 list_for_each_entry(ifa, &idev->addr_list, if_list) {
677 if (ifa->flags&IFA_F_TENTATIVE)
678 continue;
679 if (idev->cnf.forwarding)
680 addrconf_join_anycast(ifa);
681 else
682 addrconf_leave_anycast(ifa);
683 }
684 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
685 dev->ifindex, &idev->cnf);
686 }
687
688
689 static void addrconf_forward_change(struct net *net, __s32 newf)
690 {
691 struct net_device *dev;
692 struct inet6_dev *idev;
693
694 for_each_netdev(net, dev) {
695 idev = __in6_dev_get(dev);
696 if (idev) {
697 int changed = (!idev->cnf.forwarding) ^ (!newf);
698 idev->cnf.forwarding = newf;
699 if (changed)
700 dev_forward_change(idev);
701 }
702 }
703 }
704
705 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
706 {
707 struct net *net;
708 int old;
709
710 if (!rtnl_trylock())
711 return restart_syscall();
712
713 net = (struct net *)table->extra2;
714 old = *p;
715 *p = newf;
716
717 if (p == &net->ipv6.devconf_dflt->forwarding) {
718 if ((!newf) ^ (!old))
719 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
720 NETCONFA_IFINDEX_DEFAULT,
721 net->ipv6.devconf_dflt);
722 rtnl_unlock();
723 return 0;
724 }
725
726 if (p == &net->ipv6.devconf_all->forwarding) {
727 net->ipv6.devconf_dflt->forwarding = newf;
728 addrconf_forward_change(net, newf);
729 if ((!newf) ^ (!old))
730 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
731 NETCONFA_IFINDEX_ALL,
732 net->ipv6.devconf_all);
733 } else if ((!newf) ^ (!old))
734 dev_forward_change((struct inet6_dev *)table->extra1);
735 rtnl_unlock();
736
737 if (newf)
738 rt6_purge_dflt_routers(net);
739 return 1;
740 }
741 #endif
742
743 /* Nobody refers to this ifaddr, destroy it */
744 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
745 {
746 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
747
748 #ifdef NET_REFCNT_DEBUG
749 pr_debug("%s\n", __func__);
750 #endif
751
752 in6_dev_put(ifp->idev);
753
754 if (del_timer(&ifp->dad_timer))
755 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
756
757 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
758 pr_warn("Freeing alive inet6 address %p\n", ifp);
759 return;
760 }
761 ip6_rt_put(ifp->rt);
762
763 kfree_rcu(ifp, rcu);
764 }
765
766 static void
767 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
768 {
769 struct list_head *p;
770 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
771
772 /*
773 * Each device address list is sorted in order of scope -
774 * global before linklocal.
775 */
776 list_for_each(p, &idev->addr_list) {
777 struct inet6_ifaddr *ifa
778 = list_entry(p, struct inet6_ifaddr, if_list);
779 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
780 break;
781 }
782
783 list_add_tail(&ifp->if_list, p);
784 }
785
786 static u32 inet6_addr_hash(const struct in6_addr *addr)
787 {
788 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
789 }
790
791 /* On success it returns ifp with increased reference count */
792
793 static struct inet6_ifaddr *
794 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
795 const struct in6_addr *peer_addr, int pfxlen,
796 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
797 {
798 struct inet6_ifaddr *ifa = NULL;
799 struct rt6_info *rt;
800 unsigned int hash;
801 int err = 0;
802 int addr_type = ipv6_addr_type(addr);
803
804 if (addr_type == IPV6_ADDR_ANY ||
805 addr_type & IPV6_ADDR_MULTICAST ||
806 (!(idev->dev->flags & IFF_LOOPBACK) &&
807 addr_type & IPV6_ADDR_LOOPBACK))
808 return ERR_PTR(-EADDRNOTAVAIL);
809
810 rcu_read_lock_bh();
811 if (idev->dead) {
812 err = -ENODEV; /*XXX*/
813 goto out2;
814 }
815
816 if (idev->cnf.disable_ipv6) {
817 err = -EACCES;
818 goto out2;
819 }
820
821 spin_lock(&addrconf_hash_lock);
822
823 /* Ignore adding duplicate addresses on an interface */
824 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
825 ADBG("ipv6_add_addr: already assigned\n");
826 err = -EEXIST;
827 goto out;
828 }
829
830 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
831
832 if (ifa == NULL) {
833 ADBG("ipv6_add_addr: malloc failed\n");
834 err = -ENOBUFS;
835 goto out;
836 }
837
838 rt = addrconf_dst_alloc(idev, addr, false);
839 if (IS_ERR(rt)) {
840 err = PTR_ERR(rt);
841 goto out;
842 }
843
844 neigh_parms_data_state_setall(idev->nd_parms);
845
846 ifa->addr = *addr;
847 if (peer_addr)
848 ifa->peer_addr = *peer_addr;
849
850 spin_lock_init(&ifa->lock);
851 spin_lock_init(&ifa->state_lock);
852 setup_timer(&ifa->dad_timer, addrconf_dad_timer,
853 (unsigned long)ifa);
854 INIT_HLIST_NODE(&ifa->addr_lst);
855 ifa->scope = scope;
856 ifa->prefix_len = pfxlen;
857 ifa->flags = flags | IFA_F_TENTATIVE;
858 ifa->valid_lft = valid_lft;
859 ifa->prefered_lft = prefered_lft;
860 ifa->cstamp = ifa->tstamp = jiffies;
861 ifa->tokenized = false;
862
863 ifa->rt = rt;
864
865 ifa->idev = idev;
866 in6_dev_hold(idev);
867 /* For caller */
868 in6_ifa_hold(ifa);
869
870 /* Add to big hash table */
871 hash = inet6_addr_hash(addr);
872
873 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
874 spin_unlock(&addrconf_hash_lock);
875
876 write_lock(&idev->lock);
877 /* Add to inet6_dev unicast addr list. */
878 ipv6_link_dev_addr(idev, ifa);
879
880 if (ifa->flags&IFA_F_TEMPORARY) {
881 list_add(&ifa->tmp_list, &idev->tempaddr_list);
882 in6_ifa_hold(ifa);
883 }
884
885 in6_ifa_hold(ifa);
886 write_unlock(&idev->lock);
887 out2:
888 rcu_read_unlock_bh();
889
890 if (likely(err == 0))
891 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
892 else {
893 kfree(ifa);
894 ifa = ERR_PTR(err);
895 }
896
897 return ifa;
898 out:
899 spin_unlock(&addrconf_hash_lock);
900 goto out2;
901 }
902
903 enum cleanup_prefix_rt_t {
904 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
905 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
906 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
907 };
908
909 /*
910 * Check, whether the prefix for ifp would still need a prefix route
911 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
912 * constants.
913 *
914 * 1) we don't purge prefix if address was not permanent.
915 * prefix is managed by its own lifetime.
916 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
917 * 3) if there are no addresses, delete prefix.
918 * 4) if there are still other permanent address(es),
919 * corresponding prefix is still permanent.
920 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
921 * don't purge the prefix, assume user space is managing it.
922 * 6) otherwise, update prefix lifetime to the
923 * longest valid lifetime among the corresponding
924 * addresses on the device.
925 * Note: subsequent RA will update lifetime.
926 **/
927 static enum cleanup_prefix_rt_t
928 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
929 {
930 struct inet6_ifaddr *ifa;
931 struct inet6_dev *idev = ifp->idev;
932 unsigned long lifetime;
933 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
934
935 *expires = jiffies;
936
937 list_for_each_entry(ifa, &idev->addr_list, if_list) {
938 if (ifa == ifp)
939 continue;
940 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
941 ifp->prefix_len))
942 continue;
943 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
944 return CLEANUP_PREFIX_RT_NOP;
945
946 action = CLEANUP_PREFIX_RT_EXPIRE;
947
948 spin_lock(&ifa->lock);
949
950 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
951 /*
952 * Note: Because this address is
953 * not permanent, lifetime <
954 * LONG_MAX / HZ here.
955 */
956 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
957 *expires = ifa->tstamp + lifetime * HZ;
958 spin_unlock(&ifa->lock);
959 }
960
961 return action;
962 }
963
964 static void
965 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
966 {
967 struct rt6_info *rt;
968
969 rt = addrconf_get_prefix_route(&ifp->addr,
970 ifp->prefix_len,
971 ifp->idev->dev,
972 0, RTF_GATEWAY | RTF_DEFAULT);
973 if (rt) {
974 if (del_rt)
975 ip6_del_rt(rt);
976 else {
977 if (!(rt->rt6i_flags & RTF_EXPIRES))
978 rt6_set_expires(rt, expires);
979 ip6_rt_put(rt);
980 }
981 }
982 }
983
984
985 /* This function wants to get referenced ifp and releases it before return */
986
987 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
988 {
989 int state;
990 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
991 unsigned long expires;
992
993 spin_lock_bh(&ifp->state_lock);
994 state = ifp->state;
995 ifp->state = INET6_IFADDR_STATE_DEAD;
996 spin_unlock_bh(&ifp->state_lock);
997
998 if (state == INET6_IFADDR_STATE_DEAD)
999 goto out;
1000
1001 spin_lock_bh(&addrconf_hash_lock);
1002 hlist_del_init_rcu(&ifp->addr_lst);
1003 spin_unlock_bh(&addrconf_hash_lock);
1004
1005 write_lock_bh(&ifp->idev->lock);
1006
1007 if (ifp->flags&IFA_F_TEMPORARY) {
1008 list_del(&ifp->tmp_list);
1009 if (ifp->ifpub) {
1010 in6_ifa_put(ifp->ifpub);
1011 ifp->ifpub = NULL;
1012 }
1013 __in6_ifa_put(ifp);
1014 }
1015
1016 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1017 action = check_cleanup_prefix_route(ifp, &expires);
1018
1019 list_del_init(&ifp->if_list);
1020 __in6_ifa_put(ifp);
1021
1022 write_unlock_bh(&ifp->idev->lock);
1023
1024 addrconf_del_dad_timer(ifp);
1025
1026 ipv6_ifa_notify(RTM_DELADDR, ifp);
1027
1028 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1029
1030 if (action != CLEANUP_PREFIX_RT_NOP) {
1031 cleanup_prefix_route(ifp, expires,
1032 action == CLEANUP_PREFIX_RT_DEL);
1033 }
1034
1035 /* clean up prefsrc entries */
1036 rt6_remove_prefsrc(ifp);
1037 out:
1038 in6_ifa_put(ifp);
1039 }
1040
1041 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1042 {
1043 struct inet6_dev *idev = ifp->idev;
1044 struct in6_addr addr, *tmpaddr;
1045 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1046 unsigned long regen_advance;
1047 int tmp_plen;
1048 int ret = 0;
1049 u32 addr_flags;
1050 unsigned long now = jiffies;
1051
1052 write_lock_bh(&idev->lock);
1053 if (ift) {
1054 spin_lock_bh(&ift->lock);
1055 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1056 spin_unlock_bh(&ift->lock);
1057 tmpaddr = &addr;
1058 } else {
1059 tmpaddr = NULL;
1060 }
1061 retry:
1062 in6_dev_hold(idev);
1063 if (idev->cnf.use_tempaddr <= 0) {
1064 write_unlock_bh(&idev->lock);
1065 pr_info("%s: use_tempaddr is disabled\n", __func__);
1066 in6_dev_put(idev);
1067 ret = -1;
1068 goto out;
1069 }
1070 spin_lock_bh(&ifp->lock);
1071 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1072 idev->cnf.use_tempaddr = -1; /*XXX*/
1073 spin_unlock_bh(&ifp->lock);
1074 write_unlock_bh(&idev->lock);
1075 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1076 __func__);
1077 in6_dev_put(idev);
1078 ret = -1;
1079 goto out;
1080 }
1081 in6_ifa_hold(ifp);
1082 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1083 __ipv6_try_regen_rndid(idev, tmpaddr);
1084 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1085 age = (now - ifp->tstamp) / HZ;
1086 tmp_valid_lft = min_t(__u32,
1087 ifp->valid_lft,
1088 idev->cnf.temp_valid_lft + age);
1089 tmp_prefered_lft = min_t(__u32,
1090 ifp->prefered_lft,
1091 idev->cnf.temp_prefered_lft + age -
1092 idev->cnf.max_desync_factor);
1093 tmp_plen = ifp->prefix_len;
1094 tmp_tstamp = ifp->tstamp;
1095 spin_unlock_bh(&ifp->lock);
1096
1097 regen_advance = idev->cnf.regen_max_retry *
1098 idev->cnf.dad_transmits *
1099 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1100 write_unlock_bh(&idev->lock);
1101
1102 /* A temporary address is created only if this calculated Preferred
1103 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1104 * an implementation must not create a temporary address with a zero
1105 * Preferred Lifetime.
1106 */
1107 if (tmp_prefered_lft <= regen_advance) {
1108 in6_ifa_put(ifp);
1109 in6_dev_put(idev);
1110 ret = -1;
1111 goto out;
1112 }
1113
1114 addr_flags = IFA_F_TEMPORARY;
1115 /* set in addrconf_prefix_rcv() */
1116 if (ifp->flags & IFA_F_OPTIMISTIC)
1117 addr_flags |= IFA_F_OPTIMISTIC;
1118
1119 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1120 ipv6_addr_scope(&addr), addr_flags,
1121 tmp_valid_lft, tmp_prefered_lft);
1122 if (IS_ERR(ift)) {
1123 in6_ifa_put(ifp);
1124 in6_dev_put(idev);
1125 pr_info("%s: retry temporary address regeneration\n", __func__);
1126 tmpaddr = &addr;
1127 write_lock_bh(&idev->lock);
1128 goto retry;
1129 }
1130
1131 spin_lock_bh(&ift->lock);
1132 ift->ifpub = ifp;
1133 ift->cstamp = now;
1134 ift->tstamp = tmp_tstamp;
1135 spin_unlock_bh(&ift->lock);
1136
1137 addrconf_dad_start(ift);
1138 in6_ifa_put(ift);
1139 in6_dev_put(idev);
1140 out:
1141 return ret;
1142 }
1143
1144 /*
1145 * Choose an appropriate source address (RFC3484)
1146 */
1147 enum {
1148 IPV6_SADDR_RULE_INIT = 0,
1149 IPV6_SADDR_RULE_LOCAL,
1150 IPV6_SADDR_RULE_SCOPE,
1151 IPV6_SADDR_RULE_PREFERRED,
1152 #ifdef CONFIG_IPV6_MIP6
1153 IPV6_SADDR_RULE_HOA,
1154 #endif
1155 IPV6_SADDR_RULE_OIF,
1156 IPV6_SADDR_RULE_LABEL,
1157 IPV6_SADDR_RULE_PRIVACY,
1158 IPV6_SADDR_RULE_ORCHID,
1159 IPV6_SADDR_RULE_PREFIX,
1160 IPV6_SADDR_RULE_MAX
1161 };
1162
1163 struct ipv6_saddr_score {
1164 int rule;
1165 int addr_type;
1166 struct inet6_ifaddr *ifa;
1167 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1168 int scopedist;
1169 int matchlen;
1170 };
1171
1172 struct ipv6_saddr_dst {
1173 const struct in6_addr *addr;
1174 int ifindex;
1175 int scope;
1176 int label;
1177 unsigned int prefs;
1178 };
1179
1180 static inline int ipv6_saddr_preferred(int type)
1181 {
1182 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1183 return 1;
1184 return 0;
1185 }
1186
1187 static int ipv6_get_saddr_eval(struct net *net,
1188 struct ipv6_saddr_score *score,
1189 struct ipv6_saddr_dst *dst,
1190 int i)
1191 {
1192 int ret;
1193
1194 if (i <= score->rule) {
1195 switch (i) {
1196 case IPV6_SADDR_RULE_SCOPE:
1197 ret = score->scopedist;
1198 break;
1199 case IPV6_SADDR_RULE_PREFIX:
1200 ret = score->matchlen;
1201 break;
1202 default:
1203 ret = !!test_bit(i, score->scorebits);
1204 }
1205 goto out;
1206 }
1207
1208 switch (i) {
1209 case IPV6_SADDR_RULE_INIT:
1210 /* Rule 0: remember if hiscore is not ready yet */
1211 ret = !!score->ifa;
1212 break;
1213 case IPV6_SADDR_RULE_LOCAL:
1214 /* Rule 1: Prefer same address */
1215 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1216 break;
1217 case IPV6_SADDR_RULE_SCOPE:
1218 /* Rule 2: Prefer appropriate scope
1219 *
1220 * ret
1221 * ^
1222 * -1 | d 15
1223 * ---+--+-+---> scope
1224 * |
1225 * | d is scope of the destination.
1226 * B-d | \
1227 * | \ <- smaller scope is better if
1228 * B-15 | \ if scope is enough for destination.
1229 * | ret = B - scope (-1 <= scope >= d <= 15).
1230 * d-C-1 | /
1231 * |/ <- greater is better
1232 * -C / if scope is not enough for destination.
1233 * /| ret = scope - C (-1 <= d < scope <= 15).
1234 *
1235 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1236 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1237 * Assume B = 0 and we get C > 29.
1238 */
1239 ret = __ipv6_addr_src_scope(score->addr_type);
1240 if (ret >= dst->scope)
1241 ret = -ret;
1242 else
1243 ret -= 128; /* 30 is enough */
1244 score->scopedist = ret;
1245 break;
1246 case IPV6_SADDR_RULE_PREFERRED:
1247 /* Rule 3: Avoid deprecated and optimistic addresses */
1248 ret = ipv6_saddr_preferred(score->addr_type) ||
1249 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1250 break;
1251 #ifdef CONFIG_IPV6_MIP6
1252 case IPV6_SADDR_RULE_HOA:
1253 {
1254 /* Rule 4: Prefer home address */
1255 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1256 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1257 break;
1258 }
1259 #endif
1260 case IPV6_SADDR_RULE_OIF:
1261 /* Rule 5: Prefer outgoing interface */
1262 ret = (!dst->ifindex ||
1263 dst->ifindex == score->ifa->idev->dev->ifindex);
1264 break;
1265 case IPV6_SADDR_RULE_LABEL:
1266 /* Rule 6: Prefer matching label */
1267 ret = ipv6_addr_label(net,
1268 &score->ifa->addr, score->addr_type,
1269 score->ifa->idev->dev->ifindex) == dst->label;
1270 break;
1271 case IPV6_SADDR_RULE_PRIVACY:
1272 {
1273 /* Rule 7: Prefer public address
1274 * Note: prefer temporary address if use_tempaddr >= 2
1275 */
1276 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1277 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1278 score->ifa->idev->cnf.use_tempaddr >= 2;
1279 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1280 break;
1281 }
1282 case IPV6_SADDR_RULE_ORCHID:
1283 /* Rule 8-: Prefer ORCHID vs ORCHID or
1284 * non-ORCHID vs non-ORCHID
1285 */
1286 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1287 ipv6_addr_orchid(dst->addr));
1288 break;
1289 case IPV6_SADDR_RULE_PREFIX:
1290 /* Rule 8: Use longest matching prefix */
1291 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1292 if (ret > score->ifa->prefix_len)
1293 ret = score->ifa->prefix_len;
1294 score->matchlen = ret;
1295 break;
1296 default:
1297 ret = 0;
1298 }
1299
1300 if (ret)
1301 __set_bit(i, score->scorebits);
1302 score->rule = i;
1303 out:
1304 return ret;
1305 }
1306
1307 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1308 const struct in6_addr *daddr, unsigned int prefs,
1309 struct in6_addr *saddr)
1310 {
1311 struct ipv6_saddr_score scores[2],
1312 *score = &scores[0], *hiscore = &scores[1];
1313 struct ipv6_saddr_dst dst;
1314 struct net_device *dev;
1315 int dst_type;
1316
1317 dst_type = __ipv6_addr_type(daddr);
1318 dst.addr = daddr;
1319 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1320 dst.scope = __ipv6_addr_src_scope(dst_type);
1321 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1322 dst.prefs = prefs;
1323
1324 hiscore->rule = -1;
1325 hiscore->ifa = NULL;
1326
1327 rcu_read_lock();
1328
1329 for_each_netdev_rcu(net, dev) {
1330 struct inet6_dev *idev;
1331
1332 /* Candidate Source Address (section 4)
1333 * - multicast and link-local destination address,
1334 * the set of candidate source address MUST only
1335 * include addresses assigned to interfaces
1336 * belonging to the same link as the outgoing
1337 * interface.
1338 * (- For site-local destination addresses, the
1339 * set of candidate source addresses MUST only
1340 * include addresses assigned to interfaces
1341 * belonging to the same site as the outgoing
1342 * interface.)
1343 */
1344 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1345 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1346 dst.ifindex && dev->ifindex != dst.ifindex)
1347 continue;
1348
1349 idev = __in6_dev_get(dev);
1350 if (!idev)
1351 continue;
1352
1353 read_lock_bh(&idev->lock);
1354 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1355 int i;
1356
1357 /*
1358 * - Tentative Address (RFC2462 section 5.4)
1359 * - A tentative address is not considered
1360 * "assigned to an interface" in the traditional
1361 * sense, unless it is also flagged as optimistic.
1362 * - Candidate Source Address (section 4)
1363 * - In any case, anycast addresses, multicast
1364 * addresses, and the unspecified address MUST
1365 * NOT be included in a candidate set.
1366 */
1367 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1368 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1369 continue;
1370
1371 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1372
1373 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1374 score->addr_type & IPV6_ADDR_MULTICAST)) {
1375 LIMIT_NETDEBUG(KERN_DEBUG
1376 "ADDRCONF: unspecified / multicast address "
1377 "assigned as unicast address on %s",
1378 dev->name);
1379 continue;
1380 }
1381
1382 score->rule = -1;
1383 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1384
1385 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1386 int minihiscore, miniscore;
1387
1388 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1389 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1390
1391 if (minihiscore > miniscore) {
1392 if (i == IPV6_SADDR_RULE_SCOPE &&
1393 score->scopedist > 0) {
1394 /*
1395 * special case:
1396 * each remaining entry
1397 * has too small (not enough)
1398 * scope, because ifa entries
1399 * are sorted by their scope
1400 * values.
1401 */
1402 goto try_nextdev;
1403 }
1404 break;
1405 } else if (minihiscore < miniscore) {
1406 if (hiscore->ifa)
1407 in6_ifa_put(hiscore->ifa);
1408
1409 in6_ifa_hold(score->ifa);
1410
1411 swap(hiscore, score);
1412
1413 /* restore our iterator */
1414 score->ifa = hiscore->ifa;
1415
1416 break;
1417 }
1418 }
1419 }
1420 try_nextdev:
1421 read_unlock_bh(&idev->lock);
1422 }
1423 rcu_read_unlock();
1424
1425 if (!hiscore->ifa)
1426 return -EADDRNOTAVAIL;
1427
1428 *saddr = hiscore->ifa->addr;
1429 in6_ifa_put(hiscore->ifa);
1430 return 0;
1431 }
1432 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1433
1434 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1435 u32 banned_flags)
1436 {
1437 struct inet6_ifaddr *ifp;
1438 int err = -EADDRNOTAVAIL;
1439
1440 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1441 if (ifp->scope > IFA_LINK)
1442 break;
1443 if (ifp->scope == IFA_LINK &&
1444 !(ifp->flags & banned_flags)) {
1445 *addr = ifp->addr;
1446 err = 0;
1447 break;
1448 }
1449 }
1450 return err;
1451 }
1452
1453 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1454 u32 banned_flags)
1455 {
1456 struct inet6_dev *idev;
1457 int err = -EADDRNOTAVAIL;
1458
1459 rcu_read_lock();
1460 idev = __in6_dev_get(dev);
1461 if (idev) {
1462 read_lock_bh(&idev->lock);
1463 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1464 read_unlock_bh(&idev->lock);
1465 }
1466 rcu_read_unlock();
1467 return err;
1468 }
1469
1470 static int ipv6_count_addresses(struct inet6_dev *idev)
1471 {
1472 int cnt = 0;
1473 struct inet6_ifaddr *ifp;
1474
1475 read_lock_bh(&idev->lock);
1476 list_for_each_entry(ifp, &idev->addr_list, if_list)
1477 cnt++;
1478 read_unlock_bh(&idev->lock);
1479 return cnt;
1480 }
1481
1482 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1483 const struct net_device *dev, int strict)
1484 {
1485 struct inet6_ifaddr *ifp;
1486 unsigned int hash = inet6_addr_hash(addr);
1487
1488 rcu_read_lock_bh();
1489 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1490 if (!net_eq(dev_net(ifp->idev->dev), net))
1491 continue;
1492 if (ipv6_addr_equal(&ifp->addr, addr) &&
1493 !(ifp->flags&IFA_F_TENTATIVE) &&
1494 (dev == NULL || ifp->idev->dev == dev ||
1495 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1496 rcu_read_unlock_bh();
1497 return 1;
1498 }
1499 }
1500
1501 rcu_read_unlock_bh();
1502 return 0;
1503 }
1504 EXPORT_SYMBOL(ipv6_chk_addr);
1505
1506 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1507 struct net_device *dev)
1508 {
1509 unsigned int hash = inet6_addr_hash(addr);
1510 struct inet6_ifaddr *ifp;
1511
1512 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1513 if (!net_eq(dev_net(ifp->idev->dev), net))
1514 continue;
1515 if (ipv6_addr_equal(&ifp->addr, addr)) {
1516 if (dev == NULL || ifp->idev->dev == dev)
1517 return true;
1518 }
1519 }
1520 return false;
1521 }
1522
1523 /* Compares an address/prefix_len with addresses on device @dev.
1524 * If one is found it returns true.
1525 */
1526 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1527 const unsigned int prefix_len, struct net_device *dev)
1528 {
1529 struct inet6_dev *idev;
1530 struct inet6_ifaddr *ifa;
1531 bool ret = false;
1532
1533 rcu_read_lock();
1534 idev = __in6_dev_get(dev);
1535 if (idev) {
1536 read_lock_bh(&idev->lock);
1537 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1538 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1539 if (ret)
1540 break;
1541 }
1542 read_unlock_bh(&idev->lock);
1543 }
1544 rcu_read_unlock();
1545
1546 return ret;
1547 }
1548 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1549
1550 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1551 {
1552 struct inet6_dev *idev;
1553 struct inet6_ifaddr *ifa;
1554 int onlink;
1555
1556 onlink = 0;
1557 rcu_read_lock();
1558 idev = __in6_dev_get(dev);
1559 if (idev) {
1560 read_lock_bh(&idev->lock);
1561 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1562 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1563 ifa->prefix_len);
1564 if (onlink)
1565 break;
1566 }
1567 read_unlock_bh(&idev->lock);
1568 }
1569 rcu_read_unlock();
1570 return onlink;
1571 }
1572 EXPORT_SYMBOL(ipv6_chk_prefix);
1573
1574 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1575 struct net_device *dev, int strict)
1576 {
1577 struct inet6_ifaddr *ifp, *result = NULL;
1578 unsigned int hash = inet6_addr_hash(addr);
1579
1580 rcu_read_lock_bh();
1581 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1582 if (!net_eq(dev_net(ifp->idev->dev), net))
1583 continue;
1584 if (ipv6_addr_equal(&ifp->addr, addr)) {
1585 if (dev == NULL || ifp->idev->dev == dev ||
1586 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1587 result = ifp;
1588 in6_ifa_hold(ifp);
1589 break;
1590 }
1591 }
1592 }
1593 rcu_read_unlock_bh();
1594
1595 return result;
1596 }
1597
1598 /* Gets referenced address, destroys ifaddr */
1599
1600 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1601 {
1602 if (ifp->flags&IFA_F_PERMANENT) {
1603 spin_lock_bh(&ifp->lock);
1604 addrconf_del_dad_timer(ifp);
1605 ifp->flags |= IFA_F_TENTATIVE;
1606 if (dad_failed)
1607 ifp->flags |= IFA_F_DADFAILED;
1608 spin_unlock_bh(&ifp->lock);
1609 if (dad_failed)
1610 ipv6_ifa_notify(0, ifp);
1611 in6_ifa_put(ifp);
1612 } else if (ifp->flags&IFA_F_TEMPORARY) {
1613 struct inet6_ifaddr *ifpub;
1614 spin_lock_bh(&ifp->lock);
1615 ifpub = ifp->ifpub;
1616 if (ifpub) {
1617 in6_ifa_hold(ifpub);
1618 spin_unlock_bh(&ifp->lock);
1619 ipv6_create_tempaddr(ifpub, ifp);
1620 in6_ifa_put(ifpub);
1621 } else {
1622 spin_unlock_bh(&ifp->lock);
1623 }
1624 ipv6_del_addr(ifp);
1625 } else
1626 ipv6_del_addr(ifp);
1627 }
1628
1629 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1630 {
1631 int err = -ENOENT;
1632
1633 spin_lock(&ifp->state_lock);
1634 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1635 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1636 err = 0;
1637 }
1638 spin_unlock(&ifp->state_lock);
1639
1640 return err;
1641 }
1642
1643 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1644 {
1645 struct inet6_dev *idev = ifp->idev;
1646
1647 if (addrconf_dad_end(ifp)) {
1648 in6_ifa_put(ifp);
1649 return;
1650 }
1651
1652 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1653 ifp->idev->dev->name, &ifp->addr);
1654
1655 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1656 struct in6_addr addr;
1657
1658 addr.s6_addr32[0] = htonl(0xfe800000);
1659 addr.s6_addr32[1] = 0;
1660
1661 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1662 ipv6_addr_equal(&ifp->addr, &addr)) {
1663 /* DAD failed for link-local based on MAC address */
1664 idev->cnf.disable_ipv6 = 1;
1665
1666 pr_info("%s: IPv6 being disabled!\n",
1667 ifp->idev->dev->name);
1668 }
1669 }
1670
1671 addrconf_dad_stop(ifp, 1);
1672 }
1673
1674 /* Join to solicited addr multicast group. */
1675
1676 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1677 {
1678 struct in6_addr maddr;
1679
1680 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1681 return;
1682
1683 addrconf_addr_solict_mult(addr, &maddr);
1684 ipv6_dev_mc_inc(dev, &maddr);
1685 }
1686
1687 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1688 {
1689 struct in6_addr maddr;
1690
1691 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1692 return;
1693
1694 addrconf_addr_solict_mult(addr, &maddr);
1695 __ipv6_dev_mc_dec(idev, &maddr);
1696 }
1697
1698 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1699 {
1700 struct in6_addr addr;
1701 if (ifp->prefix_len >= 127) /* RFC 6164 */
1702 return;
1703 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1704 if (ipv6_addr_any(&addr))
1705 return;
1706 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1707 }
1708
1709 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1710 {
1711 struct in6_addr addr;
1712 if (ifp->prefix_len >= 127) /* RFC 6164 */
1713 return;
1714 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1715 if (ipv6_addr_any(&addr))
1716 return;
1717 __ipv6_dev_ac_dec(ifp->idev, &addr);
1718 }
1719
1720 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1721 {
1722 if (dev->addr_len != ETH_ALEN)
1723 return -1;
1724 memcpy(eui, dev->dev_addr, 3);
1725 memcpy(eui + 5, dev->dev_addr + 3, 3);
1726
1727 /*
1728 * The zSeries OSA network cards can be shared among various
1729 * OS instances, but the OSA cards have only one MAC address.
1730 * This leads to duplicate address conflicts in conjunction
1731 * with IPv6 if more than one instance uses the same card.
1732 *
1733 * The driver for these cards can deliver a unique 16-bit
1734 * identifier for each instance sharing the same card. It is
1735 * placed instead of 0xFFFE in the interface identifier. The
1736 * "u" bit of the interface identifier is not inverted in this
1737 * case. Hence the resulting interface identifier has local
1738 * scope according to RFC2373.
1739 */
1740 if (dev->dev_id) {
1741 eui[3] = (dev->dev_id >> 8) & 0xFF;
1742 eui[4] = dev->dev_id & 0xFF;
1743 } else {
1744 eui[3] = 0xFF;
1745 eui[4] = 0xFE;
1746 eui[0] ^= 2;
1747 }
1748 return 0;
1749 }
1750
1751 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1752 {
1753 if (dev->addr_len != IEEE802154_ADDR_LEN)
1754 return -1;
1755 memcpy(eui, dev->dev_addr, 8);
1756 eui[0] ^= 2;
1757 return 0;
1758 }
1759
1760 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1761 {
1762 union fwnet_hwaddr *ha;
1763
1764 if (dev->addr_len != FWNET_ALEN)
1765 return -1;
1766
1767 ha = (union fwnet_hwaddr *)dev->dev_addr;
1768
1769 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1770 eui[0] ^= 2;
1771 return 0;
1772 }
1773
1774 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1775 {
1776 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1777 if (dev->addr_len != ARCNET_ALEN)
1778 return -1;
1779 memset(eui, 0, 7);
1780 eui[7] = *(u8 *)dev->dev_addr;
1781 return 0;
1782 }
1783
1784 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1785 {
1786 if (dev->addr_len != INFINIBAND_ALEN)
1787 return -1;
1788 memcpy(eui, dev->dev_addr + 12, 8);
1789 eui[0] |= 2;
1790 return 0;
1791 }
1792
1793 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1794 {
1795 if (addr == 0)
1796 return -1;
1797 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1798 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1799 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1800 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1801 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1802 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1803 eui[1] = 0;
1804 eui[2] = 0x5E;
1805 eui[3] = 0xFE;
1806 memcpy(eui + 4, &addr, 4);
1807 return 0;
1808 }
1809
1810 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1811 {
1812 if (dev->priv_flags & IFF_ISATAP)
1813 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1814 return -1;
1815 }
1816
1817 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1818 {
1819 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1820 }
1821
1822 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1823 {
1824 memcpy(eui, dev->perm_addr, 3);
1825 memcpy(eui + 5, dev->perm_addr + 3, 3);
1826 eui[3] = 0xFF;
1827 eui[4] = 0xFE;
1828 eui[0] ^= 2;
1829 return 0;
1830 }
1831
1832 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1833 {
1834 switch (dev->type) {
1835 case ARPHRD_ETHER:
1836 case ARPHRD_FDDI:
1837 return addrconf_ifid_eui48(eui, dev);
1838 case ARPHRD_ARCNET:
1839 return addrconf_ifid_arcnet(eui, dev);
1840 case ARPHRD_INFINIBAND:
1841 return addrconf_ifid_infiniband(eui, dev);
1842 case ARPHRD_SIT:
1843 return addrconf_ifid_sit(eui, dev);
1844 case ARPHRD_IPGRE:
1845 return addrconf_ifid_gre(eui, dev);
1846 case ARPHRD_6LOWPAN:
1847 case ARPHRD_IEEE802154:
1848 return addrconf_ifid_eui64(eui, dev);
1849 case ARPHRD_IEEE1394:
1850 return addrconf_ifid_ieee1394(eui, dev);
1851 case ARPHRD_TUNNEL6:
1852 return addrconf_ifid_ip6tnl(eui, dev);
1853 }
1854 return -1;
1855 }
1856
1857 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1858 {
1859 int err = -1;
1860 struct inet6_ifaddr *ifp;
1861
1862 read_lock_bh(&idev->lock);
1863 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1864 if (ifp->scope > IFA_LINK)
1865 break;
1866 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1867 memcpy(eui, ifp->addr.s6_addr+8, 8);
1868 err = 0;
1869 break;
1870 }
1871 }
1872 read_unlock_bh(&idev->lock);
1873 return err;
1874 }
1875
1876 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1877 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1878 {
1879 regen:
1880 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1881 idev->rndid[0] &= ~0x02;
1882
1883 /*
1884 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1885 * check if generated address is not inappropriate
1886 *
1887 * - Reserved subnet anycast (RFC 2526)
1888 * 11111101 11....11 1xxxxxxx
1889 * - ISATAP (RFC4214) 6.1
1890 * 00-00-5E-FE-xx-xx-xx-xx
1891 * - value 0
1892 * - XXX: already assigned to an address on the device
1893 */
1894 if (idev->rndid[0] == 0xfd &&
1895 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1896 (idev->rndid[7]&0x80))
1897 goto regen;
1898 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1899 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1900 goto regen;
1901 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1902 goto regen;
1903 }
1904 }
1905
1906 static void ipv6_regen_rndid(unsigned long data)
1907 {
1908 struct inet6_dev *idev = (struct inet6_dev *) data;
1909 unsigned long expires;
1910
1911 rcu_read_lock_bh();
1912 write_lock_bh(&idev->lock);
1913
1914 if (idev->dead)
1915 goto out;
1916
1917 __ipv6_regen_rndid(idev);
1918
1919 expires = jiffies +
1920 idev->cnf.temp_prefered_lft * HZ -
1921 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1922 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
1923 idev->cnf.max_desync_factor * HZ;
1924 if (time_before(expires, jiffies)) {
1925 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1926 __func__, idev->dev->name);
1927 goto out;
1928 }
1929
1930 if (!mod_timer(&idev->regen_timer, expires))
1931 in6_dev_hold(idev);
1932
1933 out:
1934 write_unlock_bh(&idev->lock);
1935 rcu_read_unlock_bh();
1936 in6_dev_put(idev);
1937 }
1938
1939 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1940 {
1941 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1942 __ipv6_regen_rndid(idev);
1943 }
1944
1945 /*
1946 * Add prefix route.
1947 */
1948
1949 static void
1950 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1951 unsigned long expires, u32 flags)
1952 {
1953 struct fib6_config cfg = {
1954 .fc_table = RT6_TABLE_PREFIX,
1955 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1956 .fc_ifindex = dev->ifindex,
1957 .fc_expires = expires,
1958 .fc_dst_len = plen,
1959 .fc_flags = RTF_UP | flags,
1960 .fc_nlinfo.nl_net = dev_net(dev),
1961 .fc_protocol = RTPROT_KERNEL,
1962 };
1963
1964 cfg.fc_dst = *pfx;
1965
1966 /* Prevent useless cloning on PtP SIT.
1967 This thing is done here expecting that the whole
1968 class of non-broadcast devices need not cloning.
1969 */
1970 #if IS_ENABLED(CONFIG_IPV6_SIT)
1971 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1972 cfg.fc_flags |= RTF_NONEXTHOP;
1973 #endif
1974
1975 ip6_route_add(&cfg);
1976 }
1977
1978
1979 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1980 int plen,
1981 const struct net_device *dev,
1982 u32 flags, u32 noflags)
1983 {
1984 struct fib6_node *fn;
1985 struct rt6_info *rt = NULL;
1986 struct fib6_table *table;
1987
1988 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1989 if (table == NULL)
1990 return NULL;
1991
1992 read_lock_bh(&table->tb6_lock);
1993 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1994 if (!fn)
1995 goto out;
1996 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1997 if (rt->dst.dev->ifindex != dev->ifindex)
1998 continue;
1999 if ((rt->rt6i_flags & flags) != flags)
2000 continue;
2001 if ((rt->rt6i_flags & noflags) != 0)
2002 continue;
2003 dst_hold(&rt->dst);
2004 break;
2005 }
2006 out:
2007 read_unlock_bh(&table->tb6_lock);
2008 return rt;
2009 }
2010
2011
2012 /* Create "default" multicast route to the interface */
2013
2014 static void addrconf_add_mroute(struct net_device *dev)
2015 {
2016 struct fib6_config cfg = {
2017 .fc_table = RT6_TABLE_LOCAL,
2018 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2019 .fc_ifindex = dev->ifindex,
2020 .fc_dst_len = 8,
2021 .fc_flags = RTF_UP,
2022 .fc_nlinfo.nl_net = dev_net(dev),
2023 };
2024
2025 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2026
2027 ip6_route_add(&cfg);
2028 }
2029
2030 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2031 {
2032 struct inet6_dev *idev;
2033
2034 ASSERT_RTNL();
2035
2036 idev = ipv6_find_idev(dev);
2037 if (!idev)
2038 return ERR_PTR(-ENOBUFS);
2039
2040 if (idev->cnf.disable_ipv6)
2041 return ERR_PTR(-EACCES);
2042
2043 /* Add default multicast route */
2044 if (!(dev->flags & IFF_LOOPBACK))
2045 addrconf_add_mroute(dev);
2046
2047 return idev;
2048 }
2049
2050 static void manage_tempaddrs(struct inet6_dev *idev,
2051 struct inet6_ifaddr *ifp,
2052 __u32 valid_lft, __u32 prefered_lft,
2053 bool create, unsigned long now)
2054 {
2055 u32 flags;
2056 struct inet6_ifaddr *ift;
2057
2058 read_lock_bh(&idev->lock);
2059 /* update all temporary addresses in the list */
2060 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2061 int age, max_valid, max_prefered;
2062
2063 if (ifp != ift->ifpub)
2064 continue;
2065
2066 /* RFC 4941 section 3.3:
2067 * If a received option will extend the lifetime of a public
2068 * address, the lifetimes of temporary addresses should
2069 * be extended, subject to the overall constraint that no
2070 * temporary addresses should ever remain "valid" or "preferred"
2071 * for a time longer than (TEMP_VALID_LIFETIME) or
2072 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2073 */
2074 age = (now - ift->cstamp) / HZ;
2075 max_valid = idev->cnf.temp_valid_lft - age;
2076 if (max_valid < 0)
2077 max_valid = 0;
2078
2079 max_prefered = idev->cnf.temp_prefered_lft -
2080 idev->cnf.max_desync_factor - age;
2081 if (max_prefered < 0)
2082 max_prefered = 0;
2083
2084 if (valid_lft > max_valid)
2085 valid_lft = max_valid;
2086
2087 if (prefered_lft > max_prefered)
2088 prefered_lft = max_prefered;
2089
2090 spin_lock(&ift->lock);
2091 flags = ift->flags;
2092 ift->valid_lft = valid_lft;
2093 ift->prefered_lft = prefered_lft;
2094 ift->tstamp = now;
2095 if (prefered_lft > 0)
2096 ift->flags &= ~IFA_F_DEPRECATED;
2097
2098 spin_unlock(&ift->lock);
2099 if (!(flags&IFA_F_TENTATIVE))
2100 ipv6_ifa_notify(0, ift);
2101 }
2102
2103 if ((create || list_empty(&idev->tempaddr_list)) &&
2104 idev->cnf.use_tempaddr > 0) {
2105 /* When a new public address is created as described
2106 * in [ADDRCONF], also create a new temporary address.
2107 * Also create a temporary address if it's enabled but
2108 * no temporary address currently exists.
2109 */
2110 read_unlock_bh(&idev->lock);
2111 ipv6_create_tempaddr(ifp, NULL);
2112 } else {
2113 read_unlock_bh(&idev->lock);
2114 }
2115 }
2116
2117 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2118 {
2119 struct prefix_info *pinfo;
2120 __u32 valid_lft;
2121 __u32 prefered_lft;
2122 int addr_type;
2123 struct inet6_dev *in6_dev;
2124 struct net *net = dev_net(dev);
2125
2126 pinfo = (struct prefix_info *) opt;
2127
2128 if (len < sizeof(struct prefix_info)) {
2129 ADBG("addrconf: prefix option too short\n");
2130 return;
2131 }
2132
2133 /*
2134 * Validation checks ([ADDRCONF], page 19)
2135 */
2136
2137 addr_type = ipv6_addr_type(&pinfo->prefix);
2138
2139 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2140 return;
2141
2142 valid_lft = ntohl(pinfo->valid);
2143 prefered_lft = ntohl(pinfo->prefered);
2144
2145 if (prefered_lft > valid_lft) {
2146 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2147 return;
2148 }
2149
2150 in6_dev = in6_dev_get(dev);
2151
2152 if (in6_dev == NULL) {
2153 net_dbg_ratelimited("addrconf: device %s not configured\n",
2154 dev->name);
2155 return;
2156 }
2157
2158 /*
2159 * Two things going on here:
2160 * 1) Add routes for on-link prefixes
2161 * 2) Configure prefixes with the auto flag set
2162 */
2163
2164 if (pinfo->onlink) {
2165 struct rt6_info *rt;
2166 unsigned long rt_expires;
2167
2168 /* Avoid arithmetic overflow. Really, we could
2169 * save rt_expires in seconds, likely valid_lft,
2170 * but it would require division in fib gc, that it
2171 * not good.
2172 */
2173 if (HZ > USER_HZ)
2174 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2175 else
2176 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2177
2178 if (addrconf_finite_timeout(rt_expires))
2179 rt_expires *= HZ;
2180
2181 rt = addrconf_get_prefix_route(&pinfo->prefix,
2182 pinfo->prefix_len,
2183 dev,
2184 RTF_ADDRCONF | RTF_PREFIX_RT,
2185 RTF_GATEWAY | RTF_DEFAULT);
2186
2187 if (rt) {
2188 /* Autoconf prefix route */
2189 if (valid_lft == 0) {
2190 ip6_del_rt(rt);
2191 rt = NULL;
2192 } else if (addrconf_finite_timeout(rt_expires)) {
2193 /* not infinity */
2194 rt6_set_expires(rt, jiffies + rt_expires);
2195 } else {
2196 rt6_clean_expires(rt);
2197 }
2198 } else if (valid_lft) {
2199 clock_t expires = 0;
2200 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2201 if (addrconf_finite_timeout(rt_expires)) {
2202 /* not infinity */
2203 flags |= RTF_EXPIRES;
2204 expires = jiffies_to_clock_t(rt_expires);
2205 }
2206 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2207 dev, expires, flags);
2208 }
2209 ip6_rt_put(rt);
2210 }
2211
2212 /* Try to figure out our local address for this prefix */
2213
2214 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2215 struct inet6_ifaddr *ifp;
2216 struct in6_addr addr;
2217 int create = 0, update_lft = 0;
2218 bool tokenized = false;
2219
2220 if (pinfo->prefix_len == 64) {
2221 memcpy(&addr, &pinfo->prefix, 8);
2222
2223 if (!ipv6_addr_any(&in6_dev->token)) {
2224 read_lock_bh(&in6_dev->lock);
2225 memcpy(addr.s6_addr + 8,
2226 in6_dev->token.s6_addr + 8, 8);
2227 read_unlock_bh(&in6_dev->lock);
2228 tokenized = true;
2229 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2230 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2231 in6_dev_put(in6_dev);
2232 return;
2233 }
2234 goto ok;
2235 }
2236 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2237 pinfo->prefix_len);
2238 in6_dev_put(in6_dev);
2239 return;
2240
2241 ok:
2242
2243 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2244
2245 if (ifp == NULL && valid_lft) {
2246 int max_addresses = in6_dev->cnf.max_addresses;
2247 u32 addr_flags = 0;
2248
2249 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2250 if (in6_dev->cnf.optimistic_dad &&
2251 !net->ipv6.devconf_all->forwarding && sllao)
2252 addr_flags = IFA_F_OPTIMISTIC;
2253 #endif
2254
2255 /* Do not allow to create too much of autoconfigured
2256 * addresses; this would be too easy way to crash kernel.
2257 */
2258 if (!max_addresses ||
2259 ipv6_count_addresses(in6_dev) < max_addresses)
2260 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2261 pinfo->prefix_len,
2262 addr_type&IPV6_ADDR_SCOPE_MASK,
2263 addr_flags, valid_lft,
2264 prefered_lft);
2265
2266 if (IS_ERR_OR_NULL(ifp)) {
2267 in6_dev_put(in6_dev);
2268 return;
2269 }
2270
2271 ifp->flags |= IFA_F_MANAGETEMPADDR;
2272 update_lft = 0;
2273 create = 1;
2274 ifp->cstamp = jiffies;
2275 ifp->tokenized = tokenized;
2276 addrconf_dad_start(ifp);
2277 }
2278
2279 if (ifp) {
2280 u32 flags;
2281 unsigned long now;
2282 u32 stored_lft;
2283
2284 /* update lifetime (RFC2462 5.5.3 e) */
2285 spin_lock(&ifp->lock);
2286 now = jiffies;
2287 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2288 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2289 else
2290 stored_lft = 0;
2291 if (!update_lft && !create && stored_lft) {
2292 const u32 minimum_lft = min(
2293 stored_lft, (u32)MIN_VALID_LIFETIME);
2294 valid_lft = max(valid_lft, minimum_lft);
2295
2296 /* RFC4862 Section 5.5.3e:
2297 * "Note that the preferred lifetime of the
2298 * corresponding address is always reset to
2299 * the Preferred Lifetime in the received
2300 * Prefix Information option, regardless of
2301 * whether the valid lifetime is also reset or
2302 * ignored."
2303 *
2304 * So we should always update prefered_lft here.
2305 */
2306 update_lft = 1;
2307 }
2308
2309 if (update_lft) {
2310 ifp->valid_lft = valid_lft;
2311 ifp->prefered_lft = prefered_lft;
2312 ifp->tstamp = now;
2313 flags = ifp->flags;
2314 ifp->flags &= ~IFA_F_DEPRECATED;
2315 spin_unlock(&ifp->lock);
2316
2317 if (!(flags&IFA_F_TENTATIVE))
2318 ipv6_ifa_notify(0, ifp);
2319 } else
2320 spin_unlock(&ifp->lock);
2321
2322 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2323 create, now);
2324
2325 in6_ifa_put(ifp);
2326 addrconf_verify(0);
2327 }
2328 }
2329 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2330 in6_dev_put(in6_dev);
2331 }
2332
2333 /*
2334 * Set destination address.
2335 * Special case for SIT interfaces where we create a new "virtual"
2336 * device.
2337 */
2338 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2339 {
2340 struct in6_ifreq ireq;
2341 struct net_device *dev;
2342 int err = -EINVAL;
2343
2344 rtnl_lock();
2345
2346 err = -EFAULT;
2347 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2348 goto err_exit;
2349
2350 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2351
2352 err = -ENODEV;
2353 if (dev == NULL)
2354 goto err_exit;
2355
2356 #if IS_ENABLED(CONFIG_IPV6_SIT)
2357 if (dev->type == ARPHRD_SIT) {
2358 const struct net_device_ops *ops = dev->netdev_ops;
2359 struct ifreq ifr;
2360 struct ip_tunnel_parm p;
2361
2362 err = -EADDRNOTAVAIL;
2363 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2364 goto err_exit;
2365
2366 memset(&p, 0, sizeof(p));
2367 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2368 p.iph.saddr = 0;
2369 p.iph.version = 4;
2370 p.iph.ihl = 5;
2371 p.iph.protocol = IPPROTO_IPV6;
2372 p.iph.ttl = 64;
2373 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2374
2375 if (ops->ndo_do_ioctl) {
2376 mm_segment_t oldfs = get_fs();
2377
2378 set_fs(KERNEL_DS);
2379 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2380 set_fs(oldfs);
2381 } else
2382 err = -EOPNOTSUPP;
2383
2384 if (err == 0) {
2385 err = -ENOBUFS;
2386 dev = __dev_get_by_name(net, p.name);
2387 if (!dev)
2388 goto err_exit;
2389 err = dev_open(dev);
2390 }
2391 }
2392 #endif
2393
2394 err_exit:
2395 rtnl_unlock();
2396 return err;
2397 }
2398
2399 /*
2400 * Manual configuration of address on an interface
2401 */
2402 static int inet6_addr_add(struct net *net, int ifindex,
2403 const struct in6_addr *pfx,
2404 const struct in6_addr *peer_pfx,
2405 unsigned int plen, __u32 ifa_flags,
2406 __u32 prefered_lft, __u32 valid_lft)
2407 {
2408 struct inet6_ifaddr *ifp;
2409 struct inet6_dev *idev;
2410 struct net_device *dev;
2411 int scope;
2412 u32 flags;
2413 clock_t expires;
2414 unsigned long timeout;
2415
2416 ASSERT_RTNL();
2417
2418 if (plen > 128)
2419 return -EINVAL;
2420
2421 /* check the lifetime */
2422 if (!valid_lft || prefered_lft > valid_lft)
2423 return -EINVAL;
2424
2425 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2426 return -EINVAL;
2427
2428 dev = __dev_get_by_index(net, ifindex);
2429 if (!dev)
2430 return -ENODEV;
2431
2432 idev = addrconf_add_dev(dev);
2433 if (IS_ERR(idev))
2434 return PTR_ERR(idev);
2435
2436 scope = ipv6_addr_scope(pfx);
2437
2438 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2439 if (addrconf_finite_timeout(timeout)) {
2440 expires = jiffies_to_clock_t(timeout * HZ);
2441 valid_lft = timeout;
2442 flags = RTF_EXPIRES;
2443 } else {
2444 expires = 0;
2445 flags = 0;
2446 ifa_flags |= IFA_F_PERMANENT;
2447 }
2448
2449 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2450 if (addrconf_finite_timeout(timeout)) {
2451 if (timeout == 0)
2452 ifa_flags |= IFA_F_DEPRECATED;
2453 prefered_lft = timeout;
2454 }
2455
2456 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2457 valid_lft, prefered_lft);
2458
2459 if (!IS_ERR(ifp)) {
2460 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2461 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2462 expires, flags);
2463 }
2464
2465 /*
2466 * Note that section 3.1 of RFC 4429 indicates
2467 * that the Optimistic flag should not be set for
2468 * manually configured addresses
2469 */
2470 addrconf_dad_start(ifp);
2471 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2472 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2473 true, jiffies);
2474 in6_ifa_put(ifp);
2475 addrconf_verify(0);
2476 return 0;
2477 }
2478
2479 return PTR_ERR(ifp);
2480 }
2481
2482 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2483 unsigned int plen)
2484 {
2485 struct inet6_ifaddr *ifp;
2486 struct inet6_dev *idev;
2487 struct net_device *dev;
2488
2489 if (plen > 128)
2490 return -EINVAL;
2491
2492 dev = __dev_get_by_index(net, ifindex);
2493 if (!dev)
2494 return -ENODEV;
2495
2496 if ((idev = __in6_dev_get(dev)) == NULL)
2497 return -ENXIO;
2498
2499 read_lock_bh(&idev->lock);
2500 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2501 if (ifp->prefix_len == plen &&
2502 ipv6_addr_equal(pfx, &ifp->addr)) {
2503 in6_ifa_hold(ifp);
2504 read_unlock_bh(&idev->lock);
2505
2506 ipv6_del_addr(ifp);
2507 return 0;
2508 }
2509 }
2510 read_unlock_bh(&idev->lock);
2511 return -EADDRNOTAVAIL;
2512 }
2513
2514
2515 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2516 {
2517 struct in6_ifreq ireq;
2518 int err;
2519
2520 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2521 return -EPERM;
2522
2523 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2524 return -EFAULT;
2525
2526 rtnl_lock();
2527 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2528 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2529 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2530 rtnl_unlock();
2531 return err;
2532 }
2533
2534 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2535 {
2536 struct in6_ifreq ireq;
2537 int err;
2538
2539 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2540 return -EPERM;
2541
2542 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2543 return -EFAULT;
2544
2545 rtnl_lock();
2546 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2547 ireq.ifr6_prefixlen);
2548 rtnl_unlock();
2549 return err;
2550 }
2551
2552 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2553 int plen, int scope)
2554 {
2555 struct inet6_ifaddr *ifp;
2556
2557 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2558 scope, IFA_F_PERMANENT,
2559 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2560 if (!IS_ERR(ifp)) {
2561 spin_lock_bh(&ifp->lock);
2562 ifp->flags &= ~IFA_F_TENTATIVE;
2563 spin_unlock_bh(&ifp->lock);
2564 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2565 in6_ifa_put(ifp);
2566 }
2567 }
2568
2569 #if IS_ENABLED(CONFIG_IPV6_SIT)
2570 static void sit_add_v4_addrs(struct inet6_dev *idev)
2571 {
2572 struct in6_addr addr;
2573 struct net_device *dev;
2574 struct net *net = dev_net(idev->dev);
2575 int scope, plen;
2576 u32 pflags = 0;
2577
2578 ASSERT_RTNL();
2579
2580 memset(&addr, 0, sizeof(struct in6_addr));
2581 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2582
2583 if (idev->dev->flags&IFF_POINTOPOINT) {
2584 addr.s6_addr32[0] = htonl(0xfe800000);
2585 scope = IFA_LINK;
2586 plen = 64;
2587 } else {
2588 scope = IPV6_ADDR_COMPATv4;
2589 plen = 96;
2590 pflags |= RTF_NONEXTHOP;
2591 }
2592
2593 if (addr.s6_addr32[3]) {
2594 add_addr(idev, &addr, plen, scope);
2595 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2596 return;
2597 }
2598
2599 for_each_netdev(net, dev) {
2600 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2601 if (in_dev && (dev->flags & IFF_UP)) {
2602 struct in_ifaddr *ifa;
2603
2604 int flag = scope;
2605
2606 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2607
2608 addr.s6_addr32[3] = ifa->ifa_local;
2609
2610 if (ifa->ifa_scope == RT_SCOPE_LINK)
2611 continue;
2612 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2613 if (idev->dev->flags&IFF_POINTOPOINT)
2614 continue;
2615 flag |= IFA_HOST;
2616 }
2617
2618 add_addr(idev, &addr, plen, flag);
2619 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2620 pflags);
2621 }
2622 }
2623 }
2624 }
2625 #endif
2626
2627 static void init_loopback(struct net_device *dev)
2628 {
2629 struct inet6_dev *idev;
2630 struct net_device *sp_dev;
2631 struct inet6_ifaddr *sp_ifa;
2632 struct rt6_info *sp_rt;
2633
2634 /* ::1 */
2635
2636 ASSERT_RTNL();
2637
2638 if ((idev = ipv6_find_idev(dev)) == NULL) {
2639 pr_debug("%s: add_dev failed\n", __func__);
2640 return;
2641 }
2642
2643 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2644
2645 /* Add routes to other interface's IPv6 addresses */
2646 for_each_netdev(dev_net(dev), sp_dev) {
2647 if (!strcmp(sp_dev->name, dev->name))
2648 continue;
2649
2650 idev = __in6_dev_get(sp_dev);
2651 if (!idev)
2652 continue;
2653
2654 read_lock_bh(&idev->lock);
2655 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2656
2657 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2658 continue;
2659
2660 if (sp_ifa->rt) {
2661 /* This dst has been added to garbage list when
2662 * lo device down, release this obsolete dst and
2663 * reallocate a new router for ifa.
2664 */
2665 if (sp_ifa->rt->dst.obsolete > 0) {
2666 ip6_rt_put(sp_ifa->rt);
2667 sp_ifa->rt = NULL;
2668 } else {
2669 continue;
2670 }
2671 }
2672
2673 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2674
2675 /* Failure cases are ignored */
2676 if (!IS_ERR(sp_rt)) {
2677 sp_ifa->rt = sp_rt;
2678 ip6_ins_rt(sp_rt);
2679 }
2680 }
2681 read_unlock_bh(&idev->lock);
2682 }
2683 }
2684
2685 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2686 {
2687 struct inet6_ifaddr *ifp;
2688 u32 addr_flags = IFA_F_PERMANENT;
2689
2690 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2691 if (idev->cnf.optimistic_dad &&
2692 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2693 addr_flags |= IFA_F_OPTIMISTIC;
2694 #endif
2695
2696
2697 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2698 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2699 if (!IS_ERR(ifp)) {
2700 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2701 addrconf_dad_start(ifp);
2702 in6_ifa_put(ifp);
2703 }
2704 }
2705
2706 static void addrconf_dev_config(struct net_device *dev)
2707 {
2708 struct in6_addr addr;
2709 struct inet6_dev *idev;
2710
2711 ASSERT_RTNL();
2712
2713 if ((dev->type != ARPHRD_ETHER) &&
2714 (dev->type != ARPHRD_FDDI) &&
2715 (dev->type != ARPHRD_ARCNET) &&
2716 (dev->type != ARPHRD_INFINIBAND) &&
2717 (dev->type != ARPHRD_IEEE802154) &&
2718 (dev->type != ARPHRD_IEEE1394) &&
2719 (dev->type != ARPHRD_TUNNEL6) &&
2720 (dev->type != ARPHRD_6LOWPAN)) {
2721 /* Alas, we support only Ethernet autoconfiguration. */
2722 return;
2723 }
2724
2725 idev = addrconf_add_dev(dev);
2726 if (IS_ERR(idev))
2727 return;
2728
2729 memset(&addr, 0, sizeof(struct in6_addr));
2730 addr.s6_addr32[0] = htonl(0xFE800000);
2731
2732 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2733 addrconf_add_linklocal(idev, &addr);
2734 }
2735
2736 #if IS_ENABLED(CONFIG_IPV6_SIT)
2737 static void addrconf_sit_config(struct net_device *dev)
2738 {
2739 struct inet6_dev *idev;
2740
2741 ASSERT_RTNL();
2742
2743 /*
2744 * Configure the tunnel with one of our IPv4
2745 * addresses... we should configure all of
2746 * our v4 addrs in the tunnel
2747 */
2748
2749 if ((idev = ipv6_find_idev(dev)) == NULL) {
2750 pr_debug("%s: add_dev failed\n", __func__);
2751 return;
2752 }
2753
2754 if (dev->priv_flags & IFF_ISATAP) {
2755 struct in6_addr addr;
2756
2757 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2758 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2759 addrconf_add_linklocal(idev, &addr);
2760 return;
2761 }
2762
2763 sit_add_v4_addrs(idev);
2764
2765 if (dev->flags&IFF_POINTOPOINT)
2766 addrconf_add_mroute(dev);
2767 }
2768 #endif
2769
2770 #if IS_ENABLED(CONFIG_NET_IPGRE)
2771 static void addrconf_gre_config(struct net_device *dev)
2772 {
2773 struct inet6_dev *idev;
2774 struct in6_addr addr;
2775
2776 ASSERT_RTNL();
2777
2778 if ((idev = ipv6_find_idev(dev)) == NULL) {
2779 pr_debug("%s: add_dev failed\n", __func__);
2780 return;
2781 }
2782
2783 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2784 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2785 addrconf_add_linklocal(idev, &addr);
2786 }
2787 #endif
2788
2789 static inline int
2790 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2791 {
2792 struct in6_addr lladdr;
2793
2794 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2795 addrconf_add_linklocal(idev, &lladdr);
2796 return 0;
2797 }
2798 return -1;
2799 }
2800
2801 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2802 void *ptr)
2803 {
2804 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2805 struct inet6_dev *idev = __in6_dev_get(dev);
2806 int run_pending = 0;
2807 int err;
2808
2809 switch (event) {
2810 case NETDEV_REGISTER:
2811 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2812 idev = ipv6_add_dev(dev);
2813 if (!idev)
2814 return notifier_from_errno(-ENOMEM);
2815 }
2816 break;
2817
2818 case NETDEV_UP:
2819 case NETDEV_CHANGE:
2820 if (dev->flags & IFF_SLAVE)
2821 break;
2822
2823 if (event == NETDEV_UP) {
2824 if (!addrconf_qdisc_ok(dev)) {
2825 /* device is not ready yet. */
2826 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2827 dev->name);
2828 break;
2829 }
2830
2831 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2832 idev = ipv6_add_dev(dev);
2833
2834 if (idev) {
2835 idev->if_flags |= IF_READY;
2836 run_pending = 1;
2837 }
2838 } else {
2839 if (!addrconf_qdisc_ok(dev)) {
2840 /* device is still not ready. */
2841 break;
2842 }
2843
2844 if (idev) {
2845 if (idev->if_flags & IF_READY)
2846 /* device is already configured. */
2847 break;
2848 idev->if_flags |= IF_READY;
2849 }
2850
2851 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2852 dev->name);
2853
2854 run_pending = 1;
2855 }
2856
2857 switch (dev->type) {
2858 #if IS_ENABLED(CONFIG_IPV6_SIT)
2859 case ARPHRD_SIT:
2860 addrconf_sit_config(dev);
2861 break;
2862 #endif
2863 #if IS_ENABLED(CONFIG_NET_IPGRE)
2864 case ARPHRD_IPGRE:
2865 addrconf_gre_config(dev);
2866 break;
2867 #endif
2868 case ARPHRD_LOOPBACK:
2869 init_loopback(dev);
2870 break;
2871
2872 default:
2873 addrconf_dev_config(dev);
2874 break;
2875 }
2876
2877 if (idev) {
2878 if (run_pending)
2879 addrconf_dad_run(idev);
2880
2881 /*
2882 * If the MTU changed during the interface down,
2883 * when the interface up, the changed MTU must be
2884 * reflected in the idev as well as routers.
2885 */
2886 if (idev->cnf.mtu6 != dev->mtu &&
2887 dev->mtu >= IPV6_MIN_MTU) {
2888 rt6_mtu_change(dev, dev->mtu);
2889 idev->cnf.mtu6 = dev->mtu;
2890 }
2891 idev->tstamp = jiffies;
2892 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2893
2894 /*
2895 * If the changed mtu during down is lower than
2896 * IPV6_MIN_MTU stop IPv6 on this interface.
2897 */
2898 if (dev->mtu < IPV6_MIN_MTU)
2899 addrconf_ifdown(dev, 1);
2900 }
2901 break;
2902
2903 case NETDEV_CHANGEMTU:
2904 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2905 rt6_mtu_change(dev, dev->mtu);
2906 idev->cnf.mtu6 = dev->mtu;
2907 break;
2908 }
2909
2910 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2911 idev = ipv6_add_dev(dev);
2912 if (idev)
2913 break;
2914 }
2915
2916 /*
2917 * if MTU under IPV6_MIN_MTU.
2918 * Stop IPv6 on this interface.
2919 */
2920
2921 case NETDEV_DOWN:
2922 case NETDEV_UNREGISTER:
2923 /*
2924 * Remove all addresses from this interface.
2925 */
2926 addrconf_ifdown(dev, event != NETDEV_DOWN);
2927 break;
2928
2929 case NETDEV_CHANGENAME:
2930 if (idev) {
2931 snmp6_unregister_dev(idev);
2932 addrconf_sysctl_unregister(idev);
2933 addrconf_sysctl_register(idev);
2934 err = snmp6_register_dev(idev);
2935 if (err)
2936 return notifier_from_errno(err);
2937 }
2938 break;
2939
2940 case NETDEV_PRE_TYPE_CHANGE:
2941 case NETDEV_POST_TYPE_CHANGE:
2942 addrconf_type_change(dev, event);
2943 break;
2944 }
2945
2946 return NOTIFY_OK;
2947 }
2948
2949 /*
2950 * addrconf module should be notified of a device going up
2951 */
2952 static struct notifier_block ipv6_dev_notf = {
2953 .notifier_call = addrconf_notify,
2954 };
2955
2956 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2957 {
2958 struct inet6_dev *idev;
2959 ASSERT_RTNL();
2960
2961 idev = __in6_dev_get(dev);
2962
2963 if (event == NETDEV_POST_TYPE_CHANGE)
2964 ipv6_mc_remap(idev);
2965 else if (event == NETDEV_PRE_TYPE_CHANGE)
2966 ipv6_mc_unmap(idev);
2967 }
2968
2969 static int addrconf_ifdown(struct net_device *dev, int how)
2970 {
2971 struct net *net = dev_net(dev);
2972 struct inet6_dev *idev;
2973 struct inet6_ifaddr *ifa;
2974 int state, i;
2975
2976 ASSERT_RTNL();
2977
2978 rt6_ifdown(net, dev);
2979 neigh_ifdown(&nd_tbl, dev);
2980
2981 idev = __in6_dev_get(dev);
2982 if (idev == NULL)
2983 return -ENODEV;
2984
2985 /*
2986 * Step 1: remove reference to ipv6 device from parent device.
2987 * Do not dev_put!
2988 */
2989 if (how) {
2990 idev->dead = 1;
2991
2992 /* protected by rtnl_lock */
2993 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2994
2995 /* Step 1.5: remove snmp6 entry */
2996 snmp6_unregister_dev(idev);
2997
2998 }
2999
3000 /* Step 2: clear hash table */
3001 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3002 struct hlist_head *h = &inet6_addr_lst[i];
3003
3004 spin_lock_bh(&addrconf_hash_lock);
3005 restart:
3006 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3007 if (ifa->idev == idev) {
3008 hlist_del_init_rcu(&ifa->addr_lst);
3009 addrconf_del_dad_timer(ifa);
3010 goto restart;
3011 }
3012 }
3013 spin_unlock_bh(&addrconf_hash_lock);
3014 }
3015
3016 write_lock_bh(&idev->lock);
3017
3018 addrconf_del_rs_timer(idev);
3019
3020 /* Step 2: clear flags for stateless addrconf */
3021 if (!how)
3022 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3023
3024 if (how && del_timer(&idev->regen_timer))
3025 in6_dev_put(idev);
3026
3027 /* Step 3: clear tempaddr list */
3028 while (!list_empty(&idev->tempaddr_list)) {
3029 ifa = list_first_entry(&idev->tempaddr_list,
3030 struct inet6_ifaddr, tmp_list);
3031 list_del(&ifa->tmp_list);
3032 write_unlock_bh(&idev->lock);
3033 spin_lock_bh(&ifa->lock);
3034
3035 if (ifa->ifpub) {
3036 in6_ifa_put(ifa->ifpub);
3037 ifa->ifpub = NULL;
3038 }
3039 spin_unlock_bh(&ifa->lock);
3040 in6_ifa_put(ifa);
3041 write_lock_bh(&idev->lock);
3042 }
3043
3044 while (!list_empty(&idev->addr_list)) {
3045 ifa = list_first_entry(&idev->addr_list,
3046 struct inet6_ifaddr, if_list);
3047 addrconf_del_dad_timer(ifa);
3048
3049 list_del(&ifa->if_list);
3050
3051 write_unlock_bh(&idev->lock);
3052
3053 spin_lock_bh(&ifa->state_lock);
3054 state = ifa->state;
3055 ifa->state = INET6_IFADDR_STATE_DEAD;
3056 spin_unlock_bh(&ifa->state_lock);
3057
3058 if (state != INET6_IFADDR_STATE_DEAD) {
3059 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3060 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3061 }
3062 in6_ifa_put(ifa);
3063
3064 write_lock_bh(&idev->lock);
3065 }
3066
3067 write_unlock_bh(&idev->lock);
3068
3069 /* Step 5: Discard multicast list */
3070 if (how)
3071 ipv6_mc_destroy_dev(idev);
3072 else
3073 ipv6_mc_down(idev);
3074
3075 idev->tstamp = jiffies;
3076
3077 /* Last: Shot the device (if unregistered) */
3078 if (how) {
3079 addrconf_sysctl_unregister(idev);
3080 neigh_parms_release(&nd_tbl, idev->nd_parms);
3081 neigh_ifdown(&nd_tbl, dev);
3082 in6_dev_put(idev);
3083 }
3084 return 0;
3085 }
3086
3087 static void addrconf_rs_timer(unsigned long data)
3088 {
3089 struct inet6_dev *idev = (struct inet6_dev *)data;
3090 struct net_device *dev = idev->dev;
3091 struct in6_addr lladdr;
3092
3093 write_lock(&idev->lock);
3094 if (idev->dead || !(idev->if_flags & IF_READY))
3095 goto out;
3096
3097 if (!ipv6_accept_ra(idev))
3098 goto out;
3099
3100 /* Announcement received after solicitation was sent */
3101 if (idev->if_flags & IF_RA_RCVD)
3102 goto out;
3103
3104 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3105 write_unlock(&idev->lock);
3106 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3107 ndisc_send_rs(dev, &lladdr,
3108 &in6addr_linklocal_allrouters);
3109 else
3110 goto put;
3111
3112 write_lock(&idev->lock);
3113 /* The wait after the last probe can be shorter */
3114 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3115 idev->cnf.rtr_solicits) ?
3116 idev->cnf.rtr_solicit_delay :
3117 idev->cnf.rtr_solicit_interval);
3118 } else {
3119 /*
3120 * Note: we do not support deprecated "all on-link"
3121 * assumption any longer.
3122 */
3123 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3124 }
3125
3126 out:
3127 write_unlock(&idev->lock);
3128 put:
3129 in6_dev_put(idev);
3130 }
3131
3132 /*
3133 * Duplicate Address Detection
3134 */
3135 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3136 {
3137 unsigned long rand_num;
3138 struct inet6_dev *idev = ifp->idev;
3139
3140 if (ifp->flags & IFA_F_OPTIMISTIC)
3141 rand_num = 0;
3142 else
3143 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3144
3145 ifp->dad_probes = idev->cnf.dad_transmits;
3146 addrconf_mod_dad_timer(ifp, rand_num);
3147 }
3148
3149 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3150 {
3151 struct inet6_dev *idev = ifp->idev;
3152 struct net_device *dev = idev->dev;
3153
3154 addrconf_join_solict(dev, &ifp->addr);
3155
3156 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3157
3158 read_lock_bh(&idev->lock);
3159 spin_lock(&ifp->lock);
3160 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3161 goto out;
3162
3163 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3164 idev->cnf.accept_dad < 1 ||
3165 !(ifp->flags&IFA_F_TENTATIVE) ||
3166 ifp->flags & IFA_F_NODAD) {
3167 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3168 spin_unlock(&ifp->lock);
3169 read_unlock_bh(&idev->lock);
3170
3171 addrconf_dad_completed(ifp);
3172 return;
3173 }
3174
3175 if (!(idev->if_flags & IF_READY)) {
3176 spin_unlock(&ifp->lock);
3177 read_unlock_bh(&idev->lock);
3178 /*
3179 * If the device is not ready:
3180 * - keep it tentative if it is a permanent address.
3181 * - otherwise, kill it.
3182 */
3183 in6_ifa_hold(ifp);
3184 addrconf_dad_stop(ifp, 0);
3185 return;
3186 }
3187
3188 /*
3189 * Optimistic nodes can start receiving
3190 * Frames right away
3191 */
3192 if (ifp->flags & IFA_F_OPTIMISTIC)
3193 ip6_ins_rt(ifp->rt);
3194
3195 addrconf_dad_kick(ifp);
3196 out:
3197 spin_unlock(&ifp->lock);
3198 read_unlock_bh(&idev->lock);
3199 }
3200
3201 static void addrconf_dad_timer(unsigned long data)
3202 {
3203 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3204 struct inet6_dev *idev = ifp->idev;
3205 struct in6_addr mcaddr;
3206
3207 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3208 goto out;
3209
3210 write_lock(&idev->lock);
3211 if (idev->dead || !(idev->if_flags & IF_READY)) {
3212 write_unlock(&idev->lock);
3213 goto out;
3214 }
3215
3216 spin_lock(&ifp->lock);
3217 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3218 spin_unlock(&ifp->lock);
3219 write_unlock(&idev->lock);
3220 goto out;
3221 }
3222
3223 if (ifp->dad_probes == 0) {
3224 /*
3225 * DAD was successful
3226 */
3227
3228 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3229 spin_unlock(&ifp->lock);
3230 write_unlock(&idev->lock);
3231
3232 addrconf_dad_completed(ifp);
3233
3234 goto out;
3235 }
3236
3237 ifp->dad_probes--;
3238 addrconf_mod_dad_timer(ifp,
3239 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3240 spin_unlock(&ifp->lock);
3241 write_unlock(&idev->lock);
3242
3243 /* send a neighbour solicitation for our addr */
3244 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3245 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3246 out:
3247 in6_ifa_put(ifp);
3248 }
3249
3250 /* ifp->idev must be at least read locked */
3251 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3252 {
3253 struct inet6_ifaddr *ifpiter;
3254 struct inet6_dev *idev = ifp->idev;
3255
3256 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3257 if (ifpiter->scope > IFA_LINK)
3258 break;
3259 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3260 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3261 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3262 IFA_F_PERMANENT)
3263 return false;
3264 }
3265 return true;
3266 }
3267
3268 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3269 {
3270 struct net_device *dev = ifp->idev->dev;
3271 struct in6_addr lladdr;
3272 bool send_rs, send_mld;
3273
3274 addrconf_del_dad_timer(ifp);
3275
3276 /*
3277 * Configure the address for reception. Now it is valid.
3278 */
3279
3280 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3281
3282 /* If added prefix is link local and we are prepared to process
3283 router advertisements, start sending router solicitations.
3284 */
3285
3286 read_lock_bh(&ifp->idev->lock);
3287 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3288 send_rs = send_mld &&
3289 ipv6_accept_ra(ifp->idev) &&
3290 ifp->idev->cnf.rtr_solicits > 0 &&
3291 (dev->flags&IFF_LOOPBACK) == 0;
3292 read_unlock_bh(&ifp->idev->lock);
3293
3294 /* While dad is in progress mld report's source address is in6_addrany.
3295 * Resend with proper ll now.
3296 */
3297 if (send_mld)
3298 ipv6_mc_dad_complete(ifp->idev);
3299
3300 if (send_rs) {
3301 /*
3302 * If a host as already performed a random delay
3303 * [...] as part of DAD [...] there is no need
3304 * to delay again before sending the first RS
3305 */
3306 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3307 return;
3308 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3309
3310 write_lock_bh(&ifp->idev->lock);
3311 spin_lock(&ifp->lock);
3312 ifp->idev->rs_probes = 1;
3313 ifp->idev->if_flags |= IF_RS_SENT;
3314 addrconf_mod_rs_timer(ifp->idev,
3315 ifp->idev->cnf.rtr_solicit_interval);
3316 spin_unlock(&ifp->lock);
3317 write_unlock_bh(&ifp->idev->lock);
3318 }
3319 }
3320
3321 static void addrconf_dad_run(struct inet6_dev *idev)
3322 {
3323 struct inet6_ifaddr *ifp;
3324
3325 read_lock_bh(&idev->lock);
3326 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3327 spin_lock(&ifp->lock);
3328 if (ifp->flags & IFA_F_TENTATIVE &&
3329 ifp->state == INET6_IFADDR_STATE_DAD)
3330 addrconf_dad_kick(ifp);
3331 spin_unlock(&ifp->lock);
3332 }
3333 read_unlock_bh(&idev->lock);
3334 }
3335
3336 #ifdef CONFIG_PROC_FS
3337 struct if6_iter_state {
3338 struct seq_net_private p;
3339 int bucket;
3340 int offset;
3341 };
3342
3343 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3344 {
3345 struct inet6_ifaddr *ifa = NULL;
3346 struct if6_iter_state *state = seq->private;
3347 struct net *net = seq_file_net(seq);
3348 int p = 0;
3349
3350 /* initial bucket if pos is 0 */
3351 if (pos == 0) {
3352 state->bucket = 0;
3353 state->offset = 0;
3354 }
3355
3356 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3357 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3358 addr_lst) {
3359 if (!net_eq(dev_net(ifa->idev->dev), net))
3360 continue;
3361 /* sync with offset */
3362 if (p < state->offset) {
3363 p++;
3364 continue;
3365 }
3366 state->offset++;
3367 return ifa;
3368 }
3369
3370 /* prepare for next bucket */
3371 state->offset = 0;
3372 p = 0;
3373 }
3374 return NULL;
3375 }
3376
3377 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3378 struct inet6_ifaddr *ifa)
3379 {
3380 struct if6_iter_state *state = seq->private;
3381 struct net *net = seq_file_net(seq);
3382
3383 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3384 if (!net_eq(dev_net(ifa->idev->dev), net))
3385 continue;
3386 state->offset++;
3387 return ifa;
3388 }
3389
3390 while (++state->bucket < IN6_ADDR_HSIZE) {
3391 state->offset = 0;
3392 hlist_for_each_entry_rcu_bh(ifa,
3393 &inet6_addr_lst[state->bucket], addr_lst) {
3394 if (!net_eq(dev_net(ifa->idev->dev), net))
3395 continue;
3396 state->offset++;
3397 return ifa;
3398 }
3399 }
3400
3401 return NULL;
3402 }
3403
3404 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3405 __acquires(rcu_bh)
3406 {
3407 rcu_read_lock_bh();
3408 return if6_get_first(seq, *pos);
3409 }
3410
3411 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3412 {
3413 struct inet6_ifaddr *ifa;
3414
3415 ifa = if6_get_next(seq, v);
3416 ++*pos;
3417 return ifa;
3418 }
3419
3420 static void if6_seq_stop(struct seq_file *seq, void *v)
3421 __releases(rcu_bh)
3422 {
3423 rcu_read_unlock_bh();
3424 }
3425
3426 static int if6_seq_show(struct seq_file *seq, void *v)
3427 {
3428 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3429 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3430 &ifp->addr,
3431 ifp->idev->dev->ifindex,
3432 ifp->prefix_len,
3433 ifp->scope,
3434 (u8) ifp->flags,
3435 ifp->idev->dev->name);
3436 return 0;
3437 }
3438
3439 static const struct seq_operations if6_seq_ops = {
3440 .start = if6_seq_start,
3441 .next = if6_seq_next,
3442 .show = if6_seq_show,
3443 .stop = if6_seq_stop,
3444 };
3445
3446 static int if6_seq_open(struct inode *inode, struct file *file)
3447 {
3448 return seq_open_net(inode, file, &if6_seq_ops,
3449 sizeof(struct if6_iter_state));
3450 }
3451
3452 static const struct file_operations if6_fops = {
3453 .owner = THIS_MODULE,
3454 .open = if6_seq_open,
3455 .read = seq_read,
3456 .llseek = seq_lseek,
3457 .release = seq_release_net,
3458 };
3459
3460 static int __net_init if6_proc_net_init(struct net *net)
3461 {
3462 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3463 return -ENOMEM;
3464 return 0;
3465 }
3466
3467 static void __net_exit if6_proc_net_exit(struct net *net)
3468 {
3469 remove_proc_entry("if_inet6", net->proc_net);
3470 }
3471
3472 static struct pernet_operations if6_proc_net_ops = {
3473 .init = if6_proc_net_init,
3474 .exit = if6_proc_net_exit,
3475 };
3476
3477 int __init if6_proc_init(void)
3478 {
3479 return register_pernet_subsys(&if6_proc_net_ops);
3480 }
3481
3482 void if6_proc_exit(void)
3483 {
3484 unregister_pernet_subsys(&if6_proc_net_ops);
3485 }
3486 #endif /* CONFIG_PROC_FS */
3487
3488 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3489 /* Check if address is a home address configured on any interface. */
3490 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3491 {
3492 int ret = 0;
3493 struct inet6_ifaddr *ifp = NULL;
3494 unsigned int hash = inet6_addr_hash(addr);
3495
3496 rcu_read_lock_bh();
3497 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3498 if (!net_eq(dev_net(ifp->idev->dev), net))
3499 continue;
3500 if (ipv6_addr_equal(&ifp->addr, addr) &&
3501 (ifp->flags & IFA_F_HOMEADDRESS)) {
3502 ret = 1;
3503 break;
3504 }
3505 }
3506 rcu_read_unlock_bh();
3507 return ret;
3508 }
3509 #endif
3510
3511 /*
3512 * Periodic address status verification
3513 */
3514
3515 static void addrconf_verify(unsigned long foo)
3516 {
3517 unsigned long now, next, next_sec, next_sched;
3518 struct inet6_ifaddr *ifp;
3519 int i;
3520
3521 rcu_read_lock_bh();
3522 spin_lock(&addrconf_verify_lock);
3523 now = jiffies;
3524 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3525
3526 del_timer(&addr_chk_timer);
3527
3528 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3529 restart:
3530 hlist_for_each_entry_rcu_bh(ifp,
3531 &inet6_addr_lst[i], addr_lst) {
3532 unsigned long age;
3533
3534 /* When setting preferred_lft to a value not zero or
3535 * infinity, while valid_lft is infinity
3536 * IFA_F_PERMANENT has a non-infinity life time.
3537 */
3538 if ((ifp->flags & IFA_F_PERMANENT) &&
3539 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3540 continue;
3541
3542 spin_lock(&ifp->lock);
3543 /* We try to batch several events at once. */
3544 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3545
3546 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3547 age >= ifp->valid_lft) {
3548 spin_unlock(&ifp->lock);
3549 in6_ifa_hold(ifp);
3550 ipv6_del_addr(ifp);
3551 goto restart;
3552 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3553 spin_unlock(&ifp->lock);
3554 continue;
3555 } else if (age >= ifp->prefered_lft) {
3556 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3557 int deprecate = 0;
3558
3559 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3560 deprecate = 1;
3561 ifp->flags |= IFA_F_DEPRECATED;
3562 }
3563
3564 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3565 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3566 next = ifp->tstamp + ifp->valid_lft * HZ;
3567
3568 spin_unlock(&ifp->lock);
3569
3570 if (deprecate) {
3571 in6_ifa_hold(ifp);
3572
3573 ipv6_ifa_notify(0, ifp);
3574 in6_ifa_put(ifp);
3575 goto restart;
3576 }
3577 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3578 !(ifp->flags&IFA_F_TENTATIVE)) {
3579 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3580 ifp->idev->cnf.dad_transmits *
3581 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3582
3583 if (age >= ifp->prefered_lft - regen_advance) {
3584 struct inet6_ifaddr *ifpub = ifp->ifpub;
3585 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3586 next = ifp->tstamp + ifp->prefered_lft * HZ;
3587 if (!ifp->regen_count && ifpub) {
3588 ifp->regen_count++;
3589 in6_ifa_hold(ifp);
3590 in6_ifa_hold(ifpub);
3591 spin_unlock(&ifp->lock);
3592
3593 spin_lock(&ifpub->lock);
3594 ifpub->regen_count = 0;
3595 spin_unlock(&ifpub->lock);
3596 ipv6_create_tempaddr(ifpub, ifp);
3597 in6_ifa_put(ifpub);
3598 in6_ifa_put(ifp);
3599 goto restart;
3600 }
3601 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3602 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3603 spin_unlock(&ifp->lock);
3604 } else {
3605 /* ifp->prefered_lft <= ifp->valid_lft */
3606 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3607 next = ifp->tstamp + ifp->prefered_lft * HZ;
3608 spin_unlock(&ifp->lock);
3609 }
3610 }
3611 }
3612
3613 next_sec = round_jiffies_up(next);
3614 next_sched = next;
3615
3616 /* If rounded timeout is accurate enough, accept it. */
3617 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3618 next_sched = next_sec;
3619
3620 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3621 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3622 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3623
3624 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3625 now, next, next_sec, next_sched);
3626
3627 addr_chk_timer.expires = next_sched;
3628 add_timer(&addr_chk_timer);
3629 spin_unlock(&addrconf_verify_lock);
3630 rcu_read_unlock_bh();
3631 }
3632
3633 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3634 struct in6_addr **peer_pfx)
3635 {
3636 struct in6_addr *pfx = NULL;
3637
3638 *peer_pfx = NULL;
3639
3640 if (addr)
3641 pfx = nla_data(addr);
3642
3643 if (local) {
3644 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3645 *peer_pfx = pfx;
3646 pfx = nla_data(local);
3647 }
3648
3649 return pfx;
3650 }
3651
3652 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3653 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3654 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3655 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3656 [IFA_FLAGS] = { .len = sizeof(u32) },
3657 };
3658
3659 static int
3660 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3661 {
3662 struct net *net = sock_net(skb->sk);
3663 struct ifaddrmsg *ifm;
3664 struct nlattr *tb[IFA_MAX+1];
3665 struct in6_addr *pfx, *peer_pfx;
3666 int err;
3667
3668 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3669 if (err < 0)
3670 return err;
3671
3672 ifm = nlmsg_data(nlh);
3673 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3674 if (pfx == NULL)
3675 return -EINVAL;
3676
3677 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3678 }
3679
3680 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
3681 u32 prefered_lft, u32 valid_lft)
3682 {
3683 u32 flags;
3684 clock_t expires;
3685 unsigned long timeout;
3686 bool was_managetempaddr;
3687 bool had_prefixroute;
3688
3689 if (!valid_lft || (prefered_lft > valid_lft))
3690 return -EINVAL;
3691
3692 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3693 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3694 return -EINVAL;
3695
3696 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3697 if (addrconf_finite_timeout(timeout)) {
3698 expires = jiffies_to_clock_t(timeout * HZ);
3699 valid_lft = timeout;
3700 flags = RTF_EXPIRES;
3701 } else {
3702 expires = 0;
3703 flags = 0;
3704 ifa_flags |= IFA_F_PERMANENT;
3705 }
3706
3707 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3708 if (addrconf_finite_timeout(timeout)) {
3709 if (timeout == 0)
3710 ifa_flags |= IFA_F_DEPRECATED;
3711 prefered_lft = timeout;
3712 }
3713
3714 spin_lock_bh(&ifp->lock);
3715 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
3716 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
3717 !(ifp->flags & IFA_F_NOPREFIXROUTE);
3718 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
3719 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3720 IFA_F_NOPREFIXROUTE);
3721 ifp->flags |= ifa_flags;
3722 ifp->tstamp = jiffies;
3723 ifp->valid_lft = valid_lft;
3724 ifp->prefered_lft = prefered_lft;
3725
3726 spin_unlock_bh(&ifp->lock);
3727 if (!(ifp->flags&IFA_F_TENTATIVE))
3728 ipv6_ifa_notify(0, ifp);
3729
3730 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
3731 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3732 expires, flags);
3733 } else if (had_prefixroute) {
3734 enum cleanup_prefix_rt_t action;
3735 unsigned long rt_expires;
3736
3737 write_lock_bh(&ifp->idev->lock);
3738 action = check_cleanup_prefix_route(ifp, &rt_expires);
3739 write_unlock_bh(&ifp->idev->lock);
3740
3741 if (action != CLEANUP_PREFIX_RT_NOP) {
3742 cleanup_prefix_route(ifp, rt_expires,
3743 action == CLEANUP_PREFIX_RT_DEL);
3744 }
3745 }
3746
3747 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3748 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3749 valid_lft = prefered_lft = 0;
3750 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3751 !was_managetempaddr, jiffies);
3752 }
3753
3754 addrconf_verify(0);
3755
3756 return 0;
3757 }
3758
3759 static int
3760 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3761 {
3762 struct net *net = sock_net(skb->sk);
3763 struct ifaddrmsg *ifm;
3764 struct nlattr *tb[IFA_MAX+1];
3765 struct in6_addr *pfx, *peer_pfx;
3766 struct inet6_ifaddr *ifa;
3767 struct net_device *dev;
3768 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3769 u32 ifa_flags;
3770 int err;
3771
3772 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3773 if (err < 0)
3774 return err;
3775
3776 ifm = nlmsg_data(nlh);
3777 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3778 if (pfx == NULL)
3779 return -EINVAL;
3780
3781 if (tb[IFA_CACHEINFO]) {
3782 struct ifa_cacheinfo *ci;
3783
3784 ci = nla_data(tb[IFA_CACHEINFO]);
3785 valid_lft = ci->ifa_valid;
3786 preferred_lft = ci->ifa_prefered;
3787 } else {
3788 preferred_lft = INFINITY_LIFE_TIME;
3789 valid_lft = INFINITY_LIFE_TIME;
3790 }
3791
3792 dev = __dev_get_by_index(net, ifm->ifa_index);
3793 if (dev == NULL)
3794 return -ENODEV;
3795
3796 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3797
3798 /* We ignore other flags so far. */
3799 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3800 IFA_F_NOPREFIXROUTE;
3801
3802 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3803 if (ifa == NULL) {
3804 /*
3805 * It would be best to check for !NLM_F_CREATE here but
3806 * userspace already relies on not having to provide this.
3807 */
3808 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3809 ifm->ifa_prefixlen, ifa_flags,
3810 preferred_lft, valid_lft);
3811 }
3812
3813 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3814 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3815 err = -EEXIST;
3816 else
3817 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3818
3819 in6_ifa_put(ifa);
3820
3821 return err;
3822 }
3823
3824 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
3825 u8 scope, int ifindex)
3826 {
3827 struct ifaddrmsg *ifm;
3828
3829 ifm = nlmsg_data(nlh);
3830 ifm->ifa_family = AF_INET6;
3831 ifm->ifa_prefixlen = prefixlen;
3832 ifm->ifa_flags = flags;
3833 ifm->ifa_scope = scope;
3834 ifm->ifa_index = ifindex;
3835 }
3836
3837 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3838 unsigned long tstamp, u32 preferred, u32 valid)
3839 {
3840 struct ifa_cacheinfo ci;
3841
3842 ci.cstamp = cstamp_delta(cstamp);
3843 ci.tstamp = cstamp_delta(tstamp);
3844 ci.ifa_prefered = preferred;
3845 ci.ifa_valid = valid;
3846
3847 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3848 }
3849
3850 static inline int rt_scope(int ifa_scope)
3851 {
3852 if (ifa_scope & IFA_HOST)
3853 return RT_SCOPE_HOST;
3854 else if (ifa_scope & IFA_LINK)
3855 return RT_SCOPE_LINK;
3856 else if (ifa_scope & IFA_SITE)
3857 return RT_SCOPE_SITE;
3858 else
3859 return RT_SCOPE_UNIVERSE;
3860 }
3861
3862 static inline int inet6_ifaddr_msgsize(void)
3863 {
3864 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3865 + nla_total_size(16) /* IFA_LOCAL */
3866 + nla_total_size(16) /* IFA_ADDRESS */
3867 + nla_total_size(sizeof(struct ifa_cacheinfo))
3868 + nla_total_size(4) /* IFA_FLAGS */;
3869 }
3870
3871 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3872 u32 portid, u32 seq, int event, unsigned int flags)
3873 {
3874 struct nlmsghdr *nlh;
3875 u32 preferred, valid;
3876
3877 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3878 if (nlh == NULL)
3879 return -EMSGSIZE;
3880
3881 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3882 ifa->idev->dev->ifindex);
3883
3884 if (!((ifa->flags&IFA_F_PERMANENT) &&
3885 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
3886 preferred = ifa->prefered_lft;
3887 valid = ifa->valid_lft;
3888 if (preferred != INFINITY_LIFE_TIME) {
3889 long tval = (jiffies - ifa->tstamp)/HZ;
3890 if (preferred > tval)
3891 preferred -= tval;
3892 else
3893 preferred = 0;
3894 if (valid != INFINITY_LIFE_TIME) {
3895 if (valid > tval)
3896 valid -= tval;
3897 else
3898 valid = 0;
3899 }
3900 }
3901 } else {
3902 preferred = INFINITY_LIFE_TIME;
3903 valid = INFINITY_LIFE_TIME;
3904 }
3905
3906 if (!ipv6_addr_any(&ifa->peer_addr)) {
3907 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3908 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3909 goto error;
3910 } else
3911 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3912 goto error;
3913
3914 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3915 goto error;
3916
3917 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
3918 goto error;
3919
3920 return nlmsg_end(skb, nlh);
3921
3922 error:
3923 nlmsg_cancel(skb, nlh);
3924 return -EMSGSIZE;
3925 }
3926
3927 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3928 u32 portid, u32 seq, int event, u16 flags)
3929 {
3930 struct nlmsghdr *nlh;
3931 u8 scope = RT_SCOPE_UNIVERSE;
3932 int ifindex = ifmca->idev->dev->ifindex;
3933
3934 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3935 scope = RT_SCOPE_SITE;
3936
3937 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3938 if (nlh == NULL)
3939 return -EMSGSIZE;
3940
3941 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3942 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3943 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3944 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3945 nlmsg_cancel(skb, nlh);
3946 return -EMSGSIZE;
3947 }
3948
3949 return nlmsg_end(skb, nlh);
3950 }
3951
3952 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3953 u32 portid, u32 seq, int event, unsigned int flags)
3954 {
3955 struct nlmsghdr *nlh;
3956 u8 scope = RT_SCOPE_UNIVERSE;
3957 int ifindex = ifaca->aca_idev->dev->ifindex;
3958
3959 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3960 scope = RT_SCOPE_SITE;
3961
3962 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3963 if (nlh == NULL)
3964 return -EMSGSIZE;
3965
3966 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3967 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3968 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3969 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3970 nlmsg_cancel(skb, nlh);
3971 return -EMSGSIZE;
3972 }
3973
3974 return nlmsg_end(skb, nlh);
3975 }
3976
3977 enum addr_type_t {
3978 UNICAST_ADDR,
3979 MULTICAST_ADDR,
3980 ANYCAST_ADDR,
3981 };
3982
3983 /* called with rcu_read_lock() */
3984 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3985 struct netlink_callback *cb, enum addr_type_t type,
3986 int s_ip_idx, int *p_ip_idx)
3987 {
3988 struct ifmcaddr6 *ifmca;
3989 struct ifacaddr6 *ifaca;
3990 int err = 1;
3991 int ip_idx = *p_ip_idx;
3992
3993 read_lock_bh(&idev->lock);
3994 switch (type) {
3995 case UNICAST_ADDR: {
3996 struct inet6_ifaddr *ifa;
3997
3998 /* unicast address incl. temp addr */
3999 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4000 if (++ip_idx < s_ip_idx)
4001 continue;
4002 err = inet6_fill_ifaddr(skb, ifa,
4003 NETLINK_CB(cb->skb).portid,
4004 cb->nlh->nlmsg_seq,
4005 RTM_NEWADDR,
4006 NLM_F_MULTI);
4007 if (err <= 0)
4008 break;
4009 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4010 }
4011 break;
4012 }
4013 case MULTICAST_ADDR:
4014 /* multicast address */
4015 for (ifmca = idev->mc_list; ifmca;
4016 ifmca = ifmca->next, ip_idx++) {
4017 if (ip_idx < s_ip_idx)
4018 continue;
4019 err = inet6_fill_ifmcaddr(skb, ifmca,
4020 NETLINK_CB(cb->skb).portid,
4021 cb->nlh->nlmsg_seq,
4022 RTM_GETMULTICAST,
4023 NLM_F_MULTI);
4024 if (err <= 0)
4025 break;
4026 }
4027 break;
4028 case ANYCAST_ADDR:
4029 /* anycast address */
4030 for (ifaca = idev->ac_list; ifaca;
4031 ifaca = ifaca->aca_next, ip_idx++) {
4032 if (ip_idx < s_ip_idx)
4033 continue;
4034 err = inet6_fill_ifacaddr(skb, ifaca,
4035 NETLINK_CB(cb->skb).portid,
4036 cb->nlh->nlmsg_seq,
4037 RTM_GETANYCAST,
4038 NLM_F_MULTI);
4039 if (err <= 0)
4040 break;
4041 }
4042 break;
4043 default:
4044 break;
4045 }
4046 read_unlock_bh(&idev->lock);
4047 *p_ip_idx = ip_idx;
4048 return err;
4049 }
4050
4051 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4052 enum addr_type_t type)
4053 {
4054 struct net *net = sock_net(skb->sk);
4055 int h, s_h;
4056 int idx, ip_idx;
4057 int s_idx, s_ip_idx;
4058 struct net_device *dev;
4059 struct inet6_dev *idev;
4060 struct hlist_head *head;
4061
4062 s_h = cb->args[0];
4063 s_idx = idx = cb->args[1];
4064 s_ip_idx = ip_idx = cb->args[2];
4065
4066 rcu_read_lock();
4067 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4068 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4069 idx = 0;
4070 head = &net->dev_index_head[h];
4071 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4072 if (idx < s_idx)
4073 goto cont;
4074 if (h > s_h || idx > s_idx)
4075 s_ip_idx = 0;
4076 ip_idx = 0;
4077 idev = __in6_dev_get(dev);
4078 if (!idev)
4079 goto cont;
4080
4081 if (in6_dump_addrs(idev, skb, cb, type,
4082 s_ip_idx, &ip_idx) <= 0)
4083 goto done;
4084 cont:
4085 idx++;
4086 }
4087 }
4088 done:
4089 rcu_read_unlock();
4090 cb->args[0] = h;
4091 cb->args[1] = idx;
4092 cb->args[2] = ip_idx;
4093
4094 return skb->len;
4095 }
4096
4097 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4098 {
4099 enum addr_type_t type = UNICAST_ADDR;
4100
4101 return inet6_dump_addr(skb, cb, type);
4102 }
4103
4104 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4105 {
4106 enum addr_type_t type = MULTICAST_ADDR;
4107
4108 return inet6_dump_addr(skb, cb, type);
4109 }
4110
4111
4112 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4113 {
4114 enum addr_type_t type = ANYCAST_ADDR;
4115
4116 return inet6_dump_addr(skb, cb, type);
4117 }
4118
4119 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4120 {
4121 struct net *net = sock_net(in_skb->sk);
4122 struct ifaddrmsg *ifm;
4123 struct nlattr *tb[IFA_MAX+1];
4124 struct in6_addr *addr = NULL, *peer;
4125 struct net_device *dev = NULL;
4126 struct inet6_ifaddr *ifa;
4127 struct sk_buff *skb;
4128 int err;
4129
4130 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4131 if (err < 0)
4132 goto errout;
4133
4134 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4135 if (addr == NULL) {
4136 err = -EINVAL;
4137 goto errout;
4138 }
4139
4140 ifm = nlmsg_data(nlh);
4141 if (ifm->ifa_index)
4142 dev = __dev_get_by_index(net, ifm->ifa_index);
4143
4144 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4145 if (!ifa) {
4146 err = -EADDRNOTAVAIL;
4147 goto errout;
4148 }
4149
4150 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4151 if (!skb) {
4152 err = -ENOBUFS;
4153 goto errout_ifa;
4154 }
4155
4156 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4157 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4158 if (err < 0) {
4159 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4160 WARN_ON(err == -EMSGSIZE);
4161 kfree_skb(skb);
4162 goto errout_ifa;
4163 }
4164 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4165 errout_ifa:
4166 in6_ifa_put(ifa);
4167 errout:
4168 return err;
4169 }
4170
4171 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4172 {
4173 struct sk_buff *skb;
4174 struct net *net = dev_net(ifa->idev->dev);
4175 int err = -ENOBUFS;
4176
4177 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4178 if (skb == NULL)
4179 goto errout;
4180
4181 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4182 if (err < 0) {
4183 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4184 WARN_ON(err == -EMSGSIZE);
4185 kfree_skb(skb);
4186 goto errout;
4187 }
4188 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4189 return;
4190 errout:
4191 if (err < 0)
4192 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4193 }
4194
4195 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4196 __s32 *array, int bytes)
4197 {
4198 BUG_ON(bytes < (DEVCONF_MAX * 4));
4199
4200 memset(array, 0, bytes);
4201 array[DEVCONF_FORWARDING] = cnf->forwarding;
4202 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4203 array[DEVCONF_MTU6] = cnf->mtu6;
4204 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4205 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4206 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4207 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4208 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4209 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4210 jiffies_to_msecs(cnf->rtr_solicit_interval);
4211 array[DEVCONF_RTR_SOLICIT_DELAY] =
4212 jiffies_to_msecs(cnf->rtr_solicit_delay);
4213 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4214 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4215 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4216 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4217 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4218 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4219 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4220 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4221 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4222 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4223 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4224 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4225 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4226 #ifdef CONFIG_IPV6_ROUTER_PREF
4227 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4228 array[DEVCONF_RTR_PROBE_INTERVAL] =
4229 jiffies_to_msecs(cnf->rtr_probe_interval);
4230 #ifdef CONFIG_IPV6_ROUTE_INFO
4231 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4232 #endif
4233 #endif
4234 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4235 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4236 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4237 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4238 #endif
4239 #ifdef CONFIG_IPV6_MROUTE
4240 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4241 #endif
4242 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4243 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4244 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4245 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4246 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4247 }
4248
4249 static inline size_t inet6_ifla6_size(void)
4250 {
4251 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4252 + nla_total_size(sizeof(struct ifla_cacheinfo))
4253 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4254 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4255 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4256 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4257 }
4258
4259 static inline size_t inet6_if_nlmsg_size(void)
4260 {
4261 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4262 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4263 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4264 + nla_total_size(4) /* IFLA_MTU */
4265 + nla_total_size(4) /* IFLA_LINK */
4266 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4267 }
4268
4269 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4270 int items, int bytes)
4271 {
4272 int i;
4273 int pad = bytes - sizeof(u64) * items;
4274 BUG_ON(pad < 0);
4275
4276 /* Use put_unaligned() because stats may not be aligned for u64. */
4277 put_unaligned(items, &stats[0]);
4278 for (i = 1; i < items; i++)
4279 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4280
4281 memset(&stats[items], 0, pad);
4282 }
4283
4284 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4285 int items, int bytes, size_t syncpoff)
4286 {
4287 int i;
4288 int pad = bytes - sizeof(u64) * items;
4289 BUG_ON(pad < 0);
4290
4291 /* Use put_unaligned() because stats may not be aligned for u64. */
4292 put_unaligned(items, &stats[0]);
4293 for (i = 1; i < items; i++)
4294 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4295
4296 memset(&stats[items], 0, pad);
4297 }
4298
4299 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4300 int bytes)
4301 {
4302 switch (attrtype) {
4303 case IFLA_INET6_STATS:
4304 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4305 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4306 break;
4307 case IFLA_INET6_ICMP6STATS:
4308 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4309 break;
4310 }
4311 }
4312
4313 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4314 {
4315 struct nlattr *nla;
4316 struct ifla_cacheinfo ci;
4317
4318 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4319 goto nla_put_failure;
4320 ci.max_reasm_len = IPV6_MAXPLEN;
4321 ci.tstamp = cstamp_delta(idev->tstamp);
4322 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4323 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4324 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4325 goto nla_put_failure;
4326 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4327 if (nla == NULL)
4328 goto nla_put_failure;
4329 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4330
4331 /* XXX - MC not implemented */
4332
4333 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4334 if (nla == NULL)
4335 goto nla_put_failure;
4336 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4337
4338 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4339 if (nla == NULL)
4340 goto nla_put_failure;
4341 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4342
4343 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4344 if (nla == NULL)
4345 goto nla_put_failure;
4346 read_lock_bh(&idev->lock);
4347 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4348 read_unlock_bh(&idev->lock);
4349
4350 return 0;
4351
4352 nla_put_failure:
4353 return -EMSGSIZE;
4354 }
4355
4356 static size_t inet6_get_link_af_size(const struct net_device *dev)
4357 {
4358 if (!__in6_dev_get(dev))
4359 return 0;
4360
4361 return inet6_ifla6_size();
4362 }
4363
4364 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4365 {
4366 struct inet6_dev *idev = __in6_dev_get(dev);
4367
4368 if (!idev)
4369 return -ENODATA;
4370
4371 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4372 return -EMSGSIZE;
4373
4374 return 0;
4375 }
4376
4377 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4378 {
4379 struct inet6_ifaddr *ifp;
4380 struct net_device *dev = idev->dev;
4381 bool update_rs = false;
4382 struct in6_addr ll_addr;
4383
4384 if (token == NULL)
4385 return -EINVAL;
4386 if (ipv6_addr_any(token))
4387 return -EINVAL;
4388 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4389 return -EINVAL;
4390 if (!ipv6_accept_ra(idev))
4391 return -EINVAL;
4392 if (idev->cnf.rtr_solicits <= 0)
4393 return -EINVAL;
4394
4395 write_lock_bh(&idev->lock);
4396
4397 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4398 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4399
4400 write_unlock_bh(&idev->lock);
4401
4402 if (!idev->dead && (idev->if_flags & IF_READY) &&
4403 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4404 IFA_F_OPTIMISTIC)) {
4405
4406 /* If we're not ready, then normal ifup will take care
4407 * of this. Otherwise, we need to request our rs here.
4408 */
4409 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4410 update_rs = true;
4411 }
4412
4413 write_lock_bh(&idev->lock);
4414
4415 if (update_rs) {
4416 idev->if_flags |= IF_RS_SENT;
4417 idev->rs_probes = 1;
4418 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4419 }
4420
4421 /* Well, that's kinda nasty ... */
4422 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4423 spin_lock(&ifp->lock);
4424 if (ifp->tokenized) {
4425 ifp->valid_lft = 0;
4426 ifp->prefered_lft = 0;
4427 }
4428 spin_unlock(&ifp->lock);
4429 }
4430
4431 write_unlock_bh(&idev->lock);
4432 addrconf_verify(0);
4433 return 0;
4434 }
4435
4436 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4437 {
4438 int err = -EINVAL;
4439 struct inet6_dev *idev = __in6_dev_get(dev);
4440 struct nlattr *tb[IFLA_INET6_MAX + 1];
4441
4442 if (!idev)
4443 return -EAFNOSUPPORT;
4444
4445 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4446 BUG();
4447
4448 if (tb[IFLA_INET6_TOKEN])
4449 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4450
4451 return err;
4452 }
4453
4454 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4455 u32 portid, u32 seq, int event, unsigned int flags)
4456 {
4457 struct net_device *dev = idev->dev;
4458 struct ifinfomsg *hdr;
4459 struct nlmsghdr *nlh;
4460 void *protoinfo;
4461
4462 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4463 if (nlh == NULL)
4464 return -EMSGSIZE;
4465
4466 hdr = nlmsg_data(nlh);
4467 hdr->ifi_family = AF_INET6;
4468 hdr->__ifi_pad = 0;
4469 hdr->ifi_type = dev->type;
4470 hdr->ifi_index = dev->ifindex;
4471 hdr->ifi_flags = dev_get_flags(dev);
4472 hdr->ifi_change = 0;
4473
4474 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4475 (dev->addr_len &&
4476 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4477 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4478 (dev->ifindex != dev->iflink &&
4479 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4480 goto nla_put_failure;
4481 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4482 if (protoinfo == NULL)
4483 goto nla_put_failure;
4484
4485 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4486 goto nla_put_failure;
4487
4488 nla_nest_end(skb, protoinfo);
4489 return nlmsg_end(skb, nlh);
4490
4491 nla_put_failure:
4492 nlmsg_cancel(skb, nlh);
4493 return -EMSGSIZE;
4494 }
4495
4496 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4497 {
4498 struct net *net = sock_net(skb->sk);
4499 int h, s_h;
4500 int idx = 0, s_idx;
4501 struct net_device *dev;
4502 struct inet6_dev *idev;
4503 struct hlist_head *head;
4504
4505 s_h = cb->args[0];
4506 s_idx = cb->args[1];
4507
4508 rcu_read_lock();
4509 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4510 idx = 0;
4511 head = &net->dev_index_head[h];
4512 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4513 if (idx < s_idx)
4514 goto cont;
4515 idev = __in6_dev_get(dev);
4516 if (!idev)
4517 goto cont;
4518 if (inet6_fill_ifinfo(skb, idev,
4519 NETLINK_CB(cb->skb).portid,
4520 cb->nlh->nlmsg_seq,
4521 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4522 goto out;
4523 cont:
4524 idx++;
4525 }
4526 }
4527 out:
4528 rcu_read_unlock();
4529 cb->args[1] = idx;
4530 cb->args[0] = h;
4531
4532 return skb->len;
4533 }
4534
4535 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4536 {
4537 struct sk_buff *skb;
4538 struct net *net = dev_net(idev->dev);
4539 int err = -ENOBUFS;
4540
4541 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4542 if (skb == NULL)
4543 goto errout;
4544
4545 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4546 if (err < 0) {
4547 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4548 WARN_ON(err == -EMSGSIZE);
4549 kfree_skb(skb);
4550 goto errout;
4551 }
4552 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4553 return;
4554 errout:
4555 if (err < 0)
4556 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4557 }
4558
4559 static inline size_t inet6_prefix_nlmsg_size(void)
4560 {
4561 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4562 + nla_total_size(sizeof(struct in6_addr))
4563 + nla_total_size(sizeof(struct prefix_cacheinfo));
4564 }
4565
4566 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4567 struct prefix_info *pinfo, u32 portid, u32 seq,
4568 int event, unsigned int flags)
4569 {
4570 struct prefixmsg *pmsg;
4571 struct nlmsghdr *nlh;
4572 struct prefix_cacheinfo ci;
4573
4574 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4575 if (nlh == NULL)
4576 return -EMSGSIZE;
4577
4578 pmsg = nlmsg_data(nlh);
4579 pmsg->prefix_family = AF_INET6;
4580 pmsg->prefix_pad1 = 0;
4581 pmsg->prefix_pad2 = 0;
4582 pmsg->prefix_ifindex = idev->dev->ifindex;
4583 pmsg->prefix_len = pinfo->prefix_len;
4584 pmsg->prefix_type = pinfo->type;
4585 pmsg->prefix_pad3 = 0;
4586 pmsg->prefix_flags = 0;
4587 if (pinfo->onlink)
4588 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4589 if (pinfo->autoconf)
4590 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4591
4592 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4593 goto nla_put_failure;
4594 ci.preferred_time = ntohl(pinfo->prefered);
4595 ci.valid_time = ntohl(pinfo->valid);
4596 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4597 goto nla_put_failure;
4598 return nlmsg_end(skb, nlh);
4599
4600 nla_put_failure:
4601 nlmsg_cancel(skb, nlh);
4602 return -EMSGSIZE;
4603 }
4604
4605 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4606 struct prefix_info *pinfo)
4607 {
4608 struct sk_buff *skb;
4609 struct net *net = dev_net(idev->dev);
4610 int err = -ENOBUFS;
4611
4612 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4613 if (skb == NULL)
4614 goto errout;
4615
4616 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4617 if (err < 0) {
4618 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4619 WARN_ON(err == -EMSGSIZE);
4620 kfree_skb(skb);
4621 goto errout;
4622 }
4623 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4624 return;
4625 errout:
4626 if (err < 0)
4627 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4628 }
4629
4630 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4631 {
4632 struct net *net = dev_net(ifp->idev->dev);
4633
4634 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4635
4636 switch (event) {
4637 case RTM_NEWADDR:
4638 /*
4639 * If the address was optimistic
4640 * we inserted the route at the start of
4641 * our DAD process, so we don't need
4642 * to do it again
4643 */
4644 if (!(ifp->rt->rt6i_node))
4645 ip6_ins_rt(ifp->rt);
4646 if (ifp->idev->cnf.forwarding)
4647 addrconf_join_anycast(ifp);
4648 if (!ipv6_addr_any(&ifp->peer_addr))
4649 addrconf_prefix_route(&ifp->peer_addr, 128,
4650 ifp->idev->dev, 0, 0);
4651 break;
4652 case RTM_DELADDR:
4653 if (ifp->idev->cnf.forwarding)
4654 addrconf_leave_anycast(ifp);
4655 addrconf_leave_solict(ifp->idev, &ifp->addr);
4656 if (!ipv6_addr_any(&ifp->peer_addr)) {
4657 struct rt6_info *rt;
4658 struct net_device *dev = ifp->idev->dev;
4659
4660 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4661 dev->ifindex, 1);
4662 if (rt) {
4663 dst_hold(&rt->dst);
4664 if (ip6_del_rt(rt))
4665 dst_free(&rt->dst);
4666 }
4667 }
4668 dst_hold(&ifp->rt->dst);
4669
4670 if (ip6_del_rt(ifp->rt))
4671 dst_free(&ifp->rt->dst);
4672 break;
4673 }
4674 atomic_inc(&net->ipv6.dev_addr_genid);
4675 rt_genid_bump_ipv6(net);
4676 }
4677
4678 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4679 {
4680 rcu_read_lock_bh();
4681 if (likely(ifp->idev->dead == 0))
4682 __ipv6_ifa_notify(event, ifp);
4683 rcu_read_unlock_bh();
4684 }
4685
4686 #ifdef CONFIG_SYSCTL
4687
4688 static
4689 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4690 void __user *buffer, size_t *lenp, loff_t *ppos)
4691 {
4692 int *valp = ctl->data;
4693 int val = *valp;
4694 loff_t pos = *ppos;
4695 struct ctl_table lctl;
4696 int ret;
4697
4698 /*
4699 * ctl->data points to idev->cnf.forwarding, we should
4700 * not modify it until we get the rtnl lock.
4701 */
4702 lctl = *ctl;
4703 lctl.data = &val;
4704
4705 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4706
4707 if (write)
4708 ret = addrconf_fixup_forwarding(ctl, valp, val);
4709 if (ret)
4710 *ppos = pos;
4711 return ret;
4712 }
4713
4714 static void dev_disable_change(struct inet6_dev *idev)
4715 {
4716 struct netdev_notifier_info info;
4717
4718 if (!idev || !idev->dev)
4719 return;
4720
4721 netdev_notifier_info_init(&info, idev->dev);
4722 if (idev->cnf.disable_ipv6)
4723 addrconf_notify(NULL, NETDEV_DOWN, &info);
4724 else
4725 addrconf_notify(NULL, NETDEV_UP, &info);
4726 }
4727
4728 static void addrconf_disable_change(struct net *net, __s32 newf)
4729 {
4730 struct net_device *dev;
4731 struct inet6_dev *idev;
4732
4733 rcu_read_lock();
4734 for_each_netdev_rcu(net, dev) {
4735 idev = __in6_dev_get(dev);
4736 if (idev) {
4737 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4738 idev->cnf.disable_ipv6 = newf;
4739 if (changed)
4740 dev_disable_change(idev);
4741 }
4742 }
4743 rcu_read_unlock();
4744 }
4745
4746 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4747 {
4748 struct net *net;
4749 int old;
4750
4751 if (!rtnl_trylock())
4752 return restart_syscall();
4753
4754 net = (struct net *)table->extra2;
4755 old = *p;
4756 *p = newf;
4757
4758 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4759 rtnl_unlock();
4760 return 0;
4761 }
4762
4763 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4764 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4765 addrconf_disable_change(net, newf);
4766 } else if ((!newf) ^ (!old))
4767 dev_disable_change((struct inet6_dev *)table->extra1);
4768
4769 rtnl_unlock();
4770 return 0;
4771 }
4772
4773 static
4774 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4775 void __user *buffer, size_t *lenp, loff_t *ppos)
4776 {
4777 int *valp = ctl->data;
4778 int val = *valp;
4779 loff_t pos = *ppos;
4780 struct ctl_table lctl;
4781 int ret;
4782
4783 /*
4784 * ctl->data points to idev->cnf.disable_ipv6, we should
4785 * not modify it until we get the rtnl lock.
4786 */
4787 lctl = *ctl;
4788 lctl.data = &val;
4789
4790 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4791
4792 if (write)
4793 ret = addrconf_disable_ipv6(ctl, valp, val);
4794 if (ret)
4795 *ppos = pos;
4796 return ret;
4797 }
4798
4799 static
4800 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
4801 void __user *buffer, size_t *lenp, loff_t *ppos)
4802 {
4803 int *valp = ctl->data;
4804 int ret;
4805 int old, new;
4806
4807 old = *valp;
4808 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4809 new = *valp;
4810
4811 if (write && old != new) {
4812 struct net *net = ctl->extra2;
4813
4814 if (!rtnl_trylock())
4815 return restart_syscall();
4816
4817 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
4818 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4819 NETCONFA_IFINDEX_DEFAULT,
4820 net->ipv6.devconf_dflt);
4821 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
4822 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4823 NETCONFA_IFINDEX_ALL,
4824 net->ipv6.devconf_all);
4825 else {
4826 struct inet6_dev *idev = ctl->extra1;
4827
4828 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4829 idev->dev->ifindex,
4830 &idev->cnf);
4831 }
4832 rtnl_unlock();
4833 }
4834
4835 return ret;
4836 }
4837
4838
4839 static struct addrconf_sysctl_table
4840 {
4841 struct ctl_table_header *sysctl_header;
4842 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4843 } addrconf_sysctl __read_mostly = {
4844 .sysctl_header = NULL,
4845 .addrconf_vars = {
4846 {
4847 .procname = "forwarding",
4848 .data = &ipv6_devconf.forwarding,
4849 .maxlen = sizeof(int),
4850 .mode = 0644,
4851 .proc_handler = addrconf_sysctl_forward,
4852 },
4853 {
4854 .procname = "hop_limit",
4855 .data = &ipv6_devconf.hop_limit,
4856 .maxlen = sizeof(int),
4857 .mode = 0644,
4858 .proc_handler = proc_dointvec,
4859 },
4860 {
4861 .procname = "mtu",
4862 .data = &ipv6_devconf.mtu6,
4863 .maxlen = sizeof(int),
4864 .mode = 0644,
4865 .proc_handler = proc_dointvec,
4866 },
4867 {
4868 .procname = "accept_ra",
4869 .data = &ipv6_devconf.accept_ra,
4870 .maxlen = sizeof(int),
4871 .mode = 0644,
4872 .proc_handler = proc_dointvec,
4873 },
4874 {
4875 .procname = "accept_redirects",
4876 .data = &ipv6_devconf.accept_redirects,
4877 .maxlen = sizeof(int),
4878 .mode = 0644,
4879 .proc_handler = proc_dointvec,
4880 },
4881 {
4882 .procname = "autoconf",
4883 .data = &ipv6_devconf.autoconf,
4884 .maxlen = sizeof(int),
4885 .mode = 0644,
4886 .proc_handler = proc_dointvec,
4887 },
4888 {
4889 .procname = "dad_transmits",
4890 .data = &ipv6_devconf.dad_transmits,
4891 .maxlen = sizeof(int),
4892 .mode = 0644,
4893 .proc_handler = proc_dointvec,
4894 },
4895 {
4896 .procname = "router_solicitations",
4897 .data = &ipv6_devconf.rtr_solicits,
4898 .maxlen = sizeof(int),
4899 .mode = 0644,
4900 .proc_handler = proc_dointvec,
4901 },
4902 {
4903 .procname = "router_solicitation_interval",
4904 .data = &ipv6_devconf.rtr_solicit_interval,
4905 .maxlen = sizeof(int),
4906 .mode = 0644,
4907 .proc_handler = proc_dointvec_jiffies,
4908 },
4909 {
4910 .procname = "router_solicitation_delay",
4911 .data = &ipv6_devconf.rtr_solicit_delay,
4912 .maxlen = sizeof(int),
4913 .mode = 0644,
4914 .proc_handler = proc_dointvec_jiffies,
4915 },
4916 {
4917 .procname = "force_mld_version",
4918 .data = &ipv6_devconf.force_mld_version,
4919 .maxlen = sizeof(int),
4920 .mode = 0644,
4921 .proc_handler = proc_dointvec,
4922 },
4923 {
4924 .procname = "mldv1_unsolicited_report_interval",
4925 .data =
4926 &ipv6_devconf.mldv1_unsolicited_report_interval,
4927 .maxlen = sizeof(int),
4928 .mode = 0644,
4929 .proc_handler = proc_dointvec_ms_jiffies,
4930 },
4931 {
4932 .procname = "mldv2_unsolicited_report_interval",
4933 .data =
4934 &ipv6_devconf.mldv2_unsolicited_report_interval,
4935 .maxlen = sizeof(int),
4936 .mode = 0644,
4937 .proc_handler = proc_dointvec_ms_jiffies,
4938 },
4939 {
4940 .procname = "use_tempaddr",
4941 .data = &ipv6_devconf.use_tempaddr,
4942 .maxlen = sizeof(int),
4943 .mode = 0644,
4944 .proc_handler = proc_dointvec,
4945 },
4946 {
4947 .procname = "temp_valid_lft",
4948 .data = &ipv6_devconf.temp_valid_lft,
4949 .maxlen = sizeof(int),
4950 .mode = 0644,
4951 .proc_handler = proc_dointvec,
4952 },
4953 {
4954 .procname = "temp_prefered_lft",
4955 .data = &ipv6_devconf.temp_prefered_lft,
4956 .maxlen = sizeof(int),
4957 .mode = 0644,
4958 .proc_handler = proc_dointvec,
4959 },
4960 {
4961 .procname = "regen_max_retry",
4962 .data = &ipv6_devconf.regen_max_retry,
4963 .maxlen = sizeof(int),
4964 .mode = 0644,
4965 .proc_handler = proc_dointvec,
4966 },
4967 {
4968 .procname = "max_desync_factor",
4969 .data = &ipv6_devconf.max_desync_factor,
4970 .maxlen = sizeof(int),
4971 .mode = 0644,
4972 .proc_handler = proc_dointvec,
4973 },
4974 {
4975 .procname = "max_addresses",
4976 .data = &ipv6_devconf.max_addresses,
4977 .maxlen = sizeof(int),
4978 .mode = 0644,
4979 .proc_handler = proc_dointvec,
4980 },
4981 {
4982 .procname = "accept_ra_defrtr",
4983 .data = &ipv6_devconf.accept_ra_defrtr,
4984 .maxlen = sizeof(int),
4985 .mode = 0644,
4986 .proc_handler = proc_dointvec,
4987 },
4988 {
4989 .procname = "accept_ra_pinfo",
4990 .data = &ipv6_devconf.accept_ra_pinfo,
4991 .maxlen = sizeof(int),
4992 .mode = 0644,
4993 .proc_handler = proc_dointvec,
4994 },
4995 #ifdef CONFIG_IPV6_ROUTER_PREF
4996 {
4997 .procname = "accept_ra_rtr_pref",
4998 .data = &ipv6_devconf.accept_ra_rtr_pref,
4999 .maxlen = sizeof(int),
5000 .mode = 0644,
5001 .proc_handler = proc_dointvec,
5002 },
5003 {
5004 .procname = "router_probe_interval",
5005 .data = &ipv6_devconf.rtr_probe_interval,
5006 .maxlen = sizeof(int),
5007 .mode = 0644,
5008 .proc_handler = proc_dointvec_jiffies,
5009 },
5010 #ifdef CONFIG_IPV6_ROUTE_INFO
5011 {
5012 .procname = "accept_ra_rt_info_max_plen",
5013 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5014 .maxlen = sizeof(int),
5015 .mode = 0644,
5016 .proc_handler = proc_dointvec,
5017 },
5018 #endif
5019 #endif
5020 {
5021 .procname = "proxy_ndp",
5022 .data = &ipv6_devconf.proxy_ndp,
5023 .maxlen = sizeof(int),
5024 .mode = 0644,
5025 .proc_handler = addrconf_sysctl_proxy_ndp,
5026 },
5027 {
5028 .procname = "accept_source_route",
5029 .data = &ipv6_devconf.accept_source_route,
5030 .maxlen = sizeof(int),
5031 .mode = 0644,
5032 .proc_handler = proc_dointvec,
5033 },
5034 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5035 {
5036 .procname = "optimistic_dad",
5037 .data = &ipv6_devconf.optimistic_dad,
5038 .maxlen = sizeof(int),
5039 .mode = 0644,
5040 .proc_handler = proc_dointvec,
5041
5042 },
5043 #endif
5044 #ifdef CONFIG_IPV6_MROUTE
5045 {
5046 .procname = "mc_forwarding",
5047 .data = &ipv6_devconf.mc_forwarding,
5048 .maxlen = sizeof(int),
5049 .mode = 0444,
5050 .proc_handler = proc_dointvec,
5051 },
5052 #endif
5053 {
5054 .procname = "disable_ipv6",
5055 .data = &ipv6_devconf.disable_ipv6,
5056 .maxlen = sizeof(int),
5057 .mode = 0644,
5058 .proc_handler = addrconf_sysctl_disable,
5059 },
5060 {
5061 .procname = "accept_dad",
5062 .data = &ipv6_devconf.accept_dad,
5063 .maxlen = sizeof(int),
5064 .mode = 0644,
5065 .proc_handler = proc_dointvec,
5066 },
5067 {
5068 .procname = "force_tllao",
5069 .data = &ipv6_devconf.force_tllao,
5070 .maxlen = sizeof(int),
5071 .mode = 0644,
5072 .proc_handler = proc_dointvec
5073 },
5074 {
5075 .procname = "ndisc_notify",
5076 .data = &ipv6_devconf.ndisc_notify,
5077 .maxlen = sizeof(int),
5078 .mode = 0644,
5079 .proc_handler = proc_dointvec
5080 },
5081 {
5082 .procname = "suppress_frag_ndisc",
5083 .data = &ipv6_devconf.suppress_frag_ndisc,
5084 .maxlen = sizeof(int),
5085 .mode = 0644,
5086 .proc_handler = proc_dointvec
5087 },
5088 {
5089 /* sentinel */
5090 }
5091 },
5092 };
5093
5094 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5095 struct inet6_dev *idev, struct ipv6_devconf *p)
5096 {
5097 int i;
5098 struct addrconf_sysctl_table *t;
5099 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5100
5101 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5102 if (t == NULL)
5103 goto out;
5104
5105 for (i = 0; t->addrconf_vars[i].data; i++) {
5106 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5107 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5108 t->addrconf_vars[i].extra2 = net;
5109 }
5110
5111 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5112
5113 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5114 if (t->sysctl_header == NULL)
5115 goto free;
5116
5117 p->sysctl = t;
5118 return 0;
5119
5120 free:
5121 kfree(t);
5122 out:
5123 return -ENOBUFS;
5124 }
5125
5126 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5127 {
5128 struct addrconf_sysctl_table *t;
5129
5130 if (p->sysctl == NULL)
5131 return;
5132
5133 t = p->sysctl;
5134 p->sysctl = NULL;
5135 unregister_net_sysctl_table(t->sysctl_header);
5136 kfree(t);
5137 }
5138
5139 static void addrconf_sysctl_register(struct inet6_dev *idev)
5140 {
5141 neigh_sysctl_register(idev->dev, idev->nd_parms,
5142 &ndisc_ifinfo_sysctl_change);
5143 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5144 idev, &idev->cnf);
5145 }
5146
5147 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5148 {
5149 __addrconf_sysctl_unregister(&idev->cnf);
5150 neigh_sysctl_unregister(idev->nd_parms);
5151 }
5152
5153
5154 #endif
5155
5156 static int __net_init addrconf_init_net(struct net *net)
5157 {
5158 int err = -ENOMEM;
5159 struct ipv6_devconf *all, *dflt;
5160
5161 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5162 if (all == NULL)
5163 goto err_alloc_all;
5164
5165 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5166 if (dflt == NULL)
5167 goto err_alloc_dflt;
5168
5169 /* these will be inherited by all namespaces */
5170 dflt->autoconf = ipv6_defaults.autoconf;
5171 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5172
5173 net->ipv6.devconf_all = all;
5174 net->ipv6.devconf_dflt = dflt;
5175
5176 #ifdef CONFIG_SYSCTL
5177 err = __addrconf_sysctl_register(net, "all", NULL, all);
5178 if (err < 0)
5179 goto err_reg_all;
5180
5181 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5182 if (err < 0)
5183 goto err_reg_dflt;
5184 #endif
5185 return 0;
5186
5187 #ifdef CONFIG_SYSCTL
5188 err_reg_dflt:
5189 __addrconf_sysctl_unregister(all);
5190 err_reg_all:
5191 kfree(dflt);
5192 #endif
5193 err_alloc_dflt:
5194 kfree(all);
5195 err_alloc_all:
5196 return err;
5197 }
5198
5199 static void __net_exit addrconf_exit_net(struct net *net)
5200 {
5201 #ifdef CONFIG_SYSCTL
5202 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5203 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5204 #endif
5205 if (!net_eq(net, &init_net)) {
5206 kfree(net->ipv6.devconf_dflt);
5207 kfree(net->ipv6.devconf_all);
5208 }
5209 }
5210
5211 static struct pernet_operations addrconf_ops = {
5212 .init = addrconf_init_net,
5213 .exit = addrconf_exit_net,
5214 };
5215
5216 static struct rtnl_af_ops inet6_ops = {
5217 .family = AF_INET6,
5218 .fill_link_af = inet6_fill_link_af,
5219 .get_link_af_size = inet6_get_link_af_size,
5220 .set_link_af = inet6_set_link_af,
5221 };
5222
5223 /*
5224 * Init / cleanup code
5225 */
5226
5227 int __init addrconf_init(void)
5228 {
5229 int i, err;
5230
5231 err = ipv6_addr_label_init();
5232 if (err < 0) {
5233 pr_crit("%s: cannot initialize default policy table: %d\n",
5234 __func__, err);
5235 goto out;
5236 }
5237
5238 err = register_pernet_subsys(&addrconf_ops);
5239 if (err < 0)
5240 goto out_addrlabel;
5241
5242 /* The addrconf netdev notifier requires that loopback_dev
5243 * has it's ipv6 private information allocated and setup
5244 * before it can bring up and give link-local addresses
5245 * to other devices which are up.
5246 *
5247 * Unfortunately, loopback_dev is not necessarily the first
5248 * entry in the global dev_base list of net devices. In fact,
5249 * it is likely to be the very last entry on that list.
5250 * So this causes the notifier registry below to try and
5251 * give link-local addresses to all devices besides loopback_dev
5252 * first, then loopback_dev, which cases all the non-loopback_dev
5253 * devices to fail to get a link-local address.
5254 *
5255 * So, as a temporary fix, allocate the ipv6 structure for
5256 * loopback_dev first by hand.
5257 * Longer term, all of the dependencies ipv6 has upon the loopback
5258 * device and it being up should be removed.
5259 */
5260 rtnl_lock();
5261 if (!ipv6_add_dev(init_net.loopback_dev))
5262 err = -ENOMEM;
5263 rtnl_unlock();
5264 if (err)
5265 goto errlo;
5266
5267 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5268 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5269
5270 register_netdevice_notifier(&ipv6_dev_notf);
5271
5272 addrconf_verify(0);
5273
5274 rtnl_af_register(&inet6_ops);
5275
5276 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5277 NULL);
5278 if (err < 0)
5279 goto errout;
5280
5281 /* Only the first call to __rtnl_register can fail */
5282 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5283 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5284 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5285 inet6_dump_ifaddr, NULL);
5286 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5287 inet6_dump_ifmcaddr, NULL);
5288 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5289 inet6_dump_ifacaddr, NULL);
5290 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5291 inet6_netconf_dump_devconf, NULL);
5292
5293 ipv6_addr_label_rtnl_register();
5294
5295 return 0;
5296 errout:
5297 rtnl_af_unregister(&inet6_ops);
5298 unregister_netdevice_notifier(&ipv6_dev_notf);
5299 errlo:
5300 unregister_pernet_subsys(&addrconf_ops);
5301 out_addrlabel:
5302 ipv6_addr_label_cleanup();
5303 out:
5304 return err;
5305 }
5306
5307 void addrconf_cleanup(void)
5308 {
5309 struct net_device *dev;
5310 int i;
5311
5312 unregister_netdevice_notifier(&ipv6_dev_notf);
5313 unregister_pernet_subsys(&addrconf_ops);
5314 ipv6_addr_label_cleanup();
5315
5316 rtnl_lock();
5317
5318 __rtnl_af_unregister(&inet6_ops);
5319
5320 /* clean dev list */
5321 for_each_netdev(&init_net, dev) {
5322 if (__in6_dev_get(dev) == NULL)
5323 continue;
5324 addrconf_ifdown(dev, 1);
5325 }
5326 addrconf_ifdown(init_net.loopback_dev, 2);
5327
5328 /*
5329 * Check hash table.
5330 */
5331 spin_lock_bh(&addrconf_hash_lock);
5332 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5333 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5334 spin_unlock_bh(&addrconf_hash_lock);
5335
5336 del_timer(&addr_chk_timer);
5337 rtnl_unlock();
5338 }
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