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[mirror_ubuntu-jammy-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 * Use age calculation as in addrconf_verify to avoid unnecessary
1107 * temporary addresses being generated.
1108 */
1109 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1110 if (tmp_prefered_lft <= regen_advance + age) {
1111 in6_ifa_put(ifp);
1112 in6_dev_put(idev);
1113 ret = -1;
1114 goto out;
1115 }
1116
1117 addr_flags = IFA_F_TEMPORARY;
1118 /* set in addrconf_prefix_rcv() */
1119 if (ifp->flags & IFA_F_OPTIMISTIC)
1120 addr_flags |= IFA_F_OPTIMISTIC;
1121
1122 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1123 ipv6_addr_scope(&addr), addr_flags,
1124 tmp_valid_lft, tmp_prefered_lft);
1125 if (IS_ERR(ift)) {
1126 in6_ifa_put(ifp);
1127 in6_dev_put(idev);
1128 pr_info("%s: retry temporary address regeneration\n", __func__);
1129 tmpaddr = &addr;
1130 write_lock_bh(&idev->lock);
1131 goto retry;
1132 }
1133
1134 spin_lock_bh(&ift->lock);
1135 ift->ifpub = ifp;
1136 ift->cstamp = now;
1137 ift->tstamp = tmp_tstamp;
1138 spin_unlock_bh(&ift->lock);
1139
1140 addrconf_dad_start(ift);
1141 in6_ifa_put(ift);
1142 in6_dev_put(idev);
1143 out:
1144 return ret;
1145 }
1146
1147 /*
1148 * Choose an appropriate source address (RFC3484)
1149 */
1150 enum {
1151 IPV6_SADDR_RULE_INIT = 0,
1152 IPV6_SADDR_RULE_LOCAL,
1153 IPV6_SADDR_RULE_SCOPE,
1154 IPV6_SADDR_RULE_PREFERRED,
1155 #ifdef CONFIG_IPV6_MIP6
1156 IPV6_SADDR_RULE_HOA,
1157 #endif
1158 IPV6_SADDR_RULE_OIF,
1159 IPV6_SADDR_RULE_LABEL,
1160 IPV6_SADDR_RULE_PRIVACY,
1161 IPV6_SADDR_RULE_ORCHID,
1162 IPV6_SADDR_RULE_PREFIX,
1163 IPV6_SADDR_RULE_MAX
1164 };
1165
1166 struct ipv6_saddr_score {
1167 int rule;
1168 int addr_type;
1169 struct inet6_ifaddr *ifa;
1170 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1171 int scopedist;
1172 int matchlen;
1173 };
1174
1175 struct ipv6_saddr_dst {
1176 const struct in6_addr *addr;
1177 int ifindex;
1178 int scope;
1179 int label;
1180 unsigned int prefs;
1181 };
1182
1183 static inline int ipv6_saddr_preferred(int type)
1184 {
1185 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1186 return 1;
1187 return 0;
1188 }
1189
1190 static int ipv6_get_saddr_eval(struct net *net,
1191 struct ipv6_saddr_score *score,
1192 struct ipv6_saddr_dst *dst,
1193 int i)
1194 {
1195 int ret;
1196
1197 if (i <= score->rule) {
1198 switch (i) {
1199 case IPV6_SADDR_RULE_SCOPE:
1200 ret = score->scopedist;
1201 break;
1202 case IPV6_SADDR_RULE_PREFIX:
1203 ret = score->matchlen;
1204 break;
1205 default:
1206 ret = !!test_bit(i, score->scorebits);
1207 }
1208 goto out;
1209 }
1210
1211 switch (i) {
1212 case IPV6_SADDR_RULE_INIT:
1213 /* Rule 0: remember if hiscore is not ready yet */
1214 ret = !!score->ifa;
1215 break;
1216 case IPV6_SADDR_RULE_LOCAL:
1217 /* Rule 1: Prefer same address */
1218 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1219 break;
1220 case IPV6_SADDR_RULE_SCOPE:
1221 /* Rule 2: Prefer appropriate scope
1222 *
1223 * ret
1224 * ^
1225 * -1 | d 15
1226 * ---+--+-+---> scope
1227 * |
1228 * | d is scope of the destination.
1229 * B-d | \
1230 * | \ <- smaller scope is better if
1231 * B-15 | \ if scope is enough for destination.
1232 * | ret = B - scope (-1 <= scope >= d <= 15).
1233 * d-C-1 | /
1234 * |/ <- greater is better
1235 * -C / if scope is not enough for destination.
1236 * /| ret = scope - C (-1 <= d < scope <= 15).
1237 *
1238 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1239 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1240 * Assume B = 0 and we get C > 29.
1241 */
1242 ret = __ipv6_addr_src_scope(score->addr_type);
1243 if (ret >= dst->scope)
1244 ret = -ret;
1245 else
1246 ret -= 128; /* 30 is enough */
1247 score->scopedist = ret;
1248 break;
1249 case IPV6_SADDR_RULE_PREFERRED:
1250 /* Rule 3: Avoid deprecated and optimistic addresses */
1251 ret = ipv6_saddr_preferred(score->addr_type) ||
1252 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1253 break;
1254 #ifdef CONFIG_IPV6_MIP6
1255 case IPV6_SADDR_RULE_HOA:
1256 {
1257 /* Rule 4: Prefer home address */
1258 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1259 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1260 break;
1261 }
1262 #endif
1263 case IPV6_SADDR_RULE_OIF:
1264 /* Rule 5: Prefer outgoing interface */
1265 ret = (!dst->ifindex ||
1266 dst->ifindex == score->ifa->idev->dev->ifindex);
1267 break;
1268 case IPV6_SADDR_RULE_LABEL:
1269 /* Rule 6: Prefer matching label */
1270 ret = ipv6_addr_label(net,
1271 &score->ifa->addr, score->addr_type,
1272 score->ifa->idev->dev->ifindex) == dst->label;
1273 break;
1274 case IPV6_SADDR_RULE_PRIVACY:
1275 {
1276 /* Rule 7: Prefer public address
1277 * Note: prefer temporary address if use_tempaddr >= 2
1278 */
1279 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1280 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1281 score->ifa->idev->cnf.use_tempaddr >= 2;
1282 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1283 break;
1284 }
1285 case IPV6_SADDR_RULE_ORCHID:
1286 /* Rule 8-: Prefer ORCHID vs ORCHID or
1287 * non-ORCHID vs non-ORCHID
1288 */
1289 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1290 ipv6_addr_orchid(dst->addr));
1291 break;
1292 case IPV6_SADDR_RULE_PREFIX:
1293 /* Rule 8: Use longest matching prefix */
1294 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1295 if (ret > score->ifa->prefix_len)
1296 ret = score->ifa->prefix_len;
1297 score->matchlen = ret;
1298 break;
1299 default:
1300 ret = 0;
1301 }
1302
1303 if (ret)
1304 __set_bit(i, score->scorebits);
1305 score->rule = i;
1306 out:
1307 return ret;
1308 }
1309
1310 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1311 const struct in6_addr *daddr, unsigned int prefs,
1312 struct in6_addr *saddr)
1313 {
1314 struct ipv6_saddr_score scores[2],
1315 *score = &scores[0], *hiscore = &scores[1];
1316 struct ipv6_saddr_dst dst;
1317 struct net_device *dev;
1318 int dst_type;
1319
1320 dst_type = __ipv6_addr_type(daddr);
1321 dst.addr = daddr;
1322 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1323 dst.scope = __ipv6_addr_src_scope(dst_type);
1324 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1325 dst.prefs = prefs;
1326
1327 hiscore->rule = -1;
1328 hiscore->ifa = NULL;
1329
1330 rcu_read_lock();
1331
1332 for_each_netdev_rcu(net, dev) {
1333 struct inet6_dev *idev;
1334
1335 /* Candidate Source Address (section 4)
1336 * - multicast and link-local destination address,
1337 * the set of candidate source address MUST only
1338 * include addresses assigned to interfaces
1339 * belonging to the same link as the outgoing
1340 * interface.
1341 * (- For site-local destination addresses, the
1342 * set of candidate source addresses MUST only
1343 * include addresses assigned to interfaces
1344 * belonging to the same site as the outgoing
1345 * interface.)
1346 */
1347 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1348 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1349 dst.ifindex && dev->ifindex != dst.ifindex)
1350 continue;
1351
1352 idev = __in6_dev_get(dev);
1353 if (!idev)
1354 continue;
1355
1356 read_lock_bh(&idev->lock);
1357 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1358 int i;
1359
1360 /*
1361 * - Tentative Address (RFC2462 section 5.4)
1362 * - A tentative address is not considered
1363 * "assigned to an interface" in the traditional
1364 * sense, unless it is also flagged as optimistic.
1365 * - Candidate Source Address (section 4)
1366 * - In any case, anycast addresses, multicast
1367 * addresses, and the unspecified address MUST
1368 * NOT be included in a candidate set.
1369 */
1370 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1371 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1372 continue;
1373
1374 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1375
1376 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1377 score->addr_type & IPV6_ADDR_MULTICAST)) {
1378 LIMIT_NETDEBUG(KERN_DEBUG
1379 "ADDRCONF: unspecified / multicast address "
1380 "assigned as unicast address on %s",
1381 dev->name);
1382 continue;
1383 }
1384
1385 score->rule = -1;
1386 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1387
1388 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1389 int minihiscore, miniscore;
1390
1391 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1392 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1393
1394 if (minihiscore > miniscore) {
1395 if (i == IPV6_SADDR_RULE_SCOPE &&
1396 score->scopedist > 0) {
1397 /*
1398 * special case:
1399 * each remaining entry
1400 * has too small (not enough)
1401 * scope, because ifa entries
1402 * are sorted by their scope
1403 * values.
1404 */
1405 goto try_nextdev;
1406 }
1407 break;
1408 } else if (minihiscore < miniscore) {
1409 if (hiscore->ifa)
1410 in6_ifa_put(hiscore->ifa);
1411
1412 in6_ifa_hold(score->ifa);
1413
1414 swap(hiscore, score);
1415
1416 /* restore our iterator */
1417 score->ifa = hiscore->ifa;
1418
1419 break;
1420 }
1421 }
1422 }
1423 try_nextdev:
1424 read_unlock_bh(&idev->lock);
1425 }
1426 rcu_read_unlock();
1427
1428 if (!hiscore->ifa)
1429 return -EADDRNOTAVAIL;
1430
1431 *saddr = hiscore->ifa->addr;
1432 in6_ifa_put(hiscore->ifa);
1433 return 0;
1434 }
1435 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1436
1437 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1438 u32 banned_flags)
1439 {
1440 struct inet6_ifaddr *ifp;
1441 int err = -EADDRNOTAVAIL;
1442
1443 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1444 if (ifp->scope > IFA_LINK)
1445 break;
1446 if (ifp->scope == IFA_LINK &&
1447 !(ifp->flags & banned_flags)) {
1448 *addr = ifp->addr;
1449 err = 0;
1450 break;
1451 }
1452 }
1453 return err;
1454 }
1455
1456 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1457 u32 banned_flags)
1458 {
1459 struct inet6_dev *idev;
1460 int err = -EADDRNOTAVAIL;
1461
1462 rcu_read_lock();
1463 idev = __in6_dev_get(dev);
1464 if (idev) {
1465 read_lock_bh(&idev->lock);
1466 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1467 read_unlock_bh(&idev->lock);
1468 }
1469 rcu_read_unlock();
1470 return err;
1471 }
1472
1473 static int ipv6_count_addresses(struct inet6_dev *idev)
1474 {
1475 int cnt = 0;
1476 struct inet6_ifaddr *ifp;
1477
1478 read_lock_bh(&idev->lock);
1479 list_for_each_entry(ifp, &idev->addr_list, if_list)
1480 cnt++;
1481 read_unlock_bh(&idev->lock);
1482 return cnt;
1483 }
1484
1485 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1486 const struct net_device *dev, int strict)
1487 {
1488 struct inet6_ifaddr *ifp;
1489 unsigned int hash = inet6_addr_hash(addr);
1490
1491 rcu_read_lock_bh();
1492 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1493 if (!net_eq(dev_net(ifp->idev->dev), net))
1494 continue;
1495 if (ipv6_addr_equal(&ifp->addr, addr) &&
1496 !(ifp->flags&IFA_F_TENTATIVE) &&
1497 (dev == NULL || ifp->idev->dev == dev ||
1498 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1499 rcu_read_unlock_bh();
1500 return 1;
1501 }
1502 }
1503
1504 rcu_read_unlock_bh();
1505 return 0;
1506 }
1507 EXPORT_SYMBOL(ipv6_chk_addr);
1508
1509 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1510 struct net_device *dev)
1511 {
1512 unsigned int hash = inet6_addr_hash(addr);
1513 struct inet6_ifaddr *ifp;
1514
1515 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1516 if (!net_eq(dev_net(ifp->idev->dev), net))
1517 continue;
1518 if (ipv6_addr_equal(&ifp->addr, addr)) {
1519 if (dev == NULL || ifp->idev->dev == dev)
1520 return true;
1521 }
1522 }
1523 return false;
1524 }
1525
1526 /* Compares an address/prefix_len with addresses on device @dev.
1527 * If one is found it returns true.
1528 */
1529 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1530 const unsigned int prefix_len, struct net_device *dev)
1531 {
1532 struct inet6_dev *idev;
1533 struct inet6_ifaddr *ifa;
1534 bool ret = false;
1535
1536 rcu_read_lock();
1537 idev = __in6_dev_get(dev);
1538 if (idev) {
1539 read_lock_bh(&idev->lock);
1540 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1541 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1542 if (ret)
1543 break;
1544 }
1545 read_unlock_bh(&idev->lock);
1546 }
1547 rcu_read_unlock();
1548
1549 return ret;
1550 }
1551 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1552
1553 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1554 {
1555 struct inet6_dev *idev;
1556 struct inet6_ifaddr *ifa;
1557 int onlink;
1558
1559 onlink = 0;
1560 rcu_read_lock();
1561 idev = __in6_dev_get(dev);
1562 if (idev) {
1563 read_lock_bh(&idev->lock);
1564 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1565 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1566 ifa->prefix_len);
1567 if (onlink)
1568 break;
1569 }
1570 read_unlock_bh(&idev->lock);
1571 }
1572 rcu_read_unlock();
1573 return onlink;
1574 }
1575 EXPORT_SYMBOL(ipv6_chk_prefix);
1576
1577 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1578 struct net_device *dev, int strict)
1579 {
1580 struct inet6_ifaddr *ifp, *result = NULL;
1581 unsigned int hash = inet6_addr_hash(addr);
1582
1583 rcu_read_lock_bh();
1584 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1585 if (!net_eq(dev_net(ifp->idev->dev), net))
1586 continue;
1587 if (ipv6_addr_equal(&ifp->addr, addr)) {
1588 if (dev == NULL || ifp->idev->dev == dev ||
1589 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1590 result = ifp;
1591 in6_ifa_hold(ifp);
1592 break;
1593 }
1594 }
1595 }
1596 rcu_read_unlock_bh();
1597
1598 return result;
1599 }
1600
1601 /* Gets referenced address, destroys ifaddr */
1602
1603 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1604 {
1605 if (ifp->flags&IFA_F_PERMANENT) {
1606 spin_lock_bh(&ifp->lock);
1607 addrconf_del_dad_timer(ifp);
1608 ifp->flags |= IFA_F_TENTATIVE;
1609 if (dad_failed)
1610 ifp->flags |= IFA_F_DADFAILED;
1611 spin_unlock_bh(&ifp->lock);
1612 if (dad_failed)
1613 ipv6_ifa_notify(0, ifp);
1614 in6_ifa_put(ifp);
1615 } else if (ifp->flags&IFA_F_TEMPORARY) {
1616 struct inet6_ifaddr *ifpub;
1617 spin_lock_bh(&ifp->lock);
1618 ifpub = ifp->ifpub;
1619 if (ifpub) {
1620 in6_ifa_hold(ifpub);
1621 spin_unlock_bh(&ifp->lock);
1622 ipv6_create_tempaddr(ifpub, ifp);
1623 in6_ifa_put(ifpub);
1624 } else {
1625 spin_unlock_bh(&ifp->lock);
1626 }
1627 ipv6_del_addr(ifp);
1628 } else
1629 ipv6_del_addr(ifp);
1630 }
1631
1632 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1633 {
1634 int err = -ENOENT;
1635
1636 spin_lock(&ifp->state_lock);
1637 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1638 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1639 err = 0;
1640 }
1641 spin_unlock(&ifp->state_lock);
1642
1643 return err;
1644 }
1645
1646 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1647 {
1648 struct inet6_dev *idev = ifp->idev;
1649
1650 if (addrconf_dad_end(ifp)) {
1651 in6_ifa_put(ifp);
1652 return;
1653 }
1654
1655 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1656 ifp->idev->dev->name, &ifp->addr);
1657
1658 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1659 struct in6_addr addr;
1660
1661 addr.s6_addr32[0] = htonl(0xfe800000);
1662 addr.s6_addr32[1] = 0;
1663
1664 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1665 ipv6_addr_equal(&ifp->addr, &addr)) {
1666 /* DAD failed for link-local based on MAC address */
1667 idev->cnf.disable_ipv6 = 1;
1668
1669 pr_info("%s: IPv6 being disabled!\n",
1670 ifp->idev->dev->name);
1671 }
1672 }
1673
1674 addrconf_dad_stop(ifp, 1);
1675 }
1676
1677 /* Join to solicited addr multicast group. */
1678
1679 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1680 {
1681 struct in6_addr maddr;
1682
1683 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1684 return;
1685
1686 addrconf_addr_solict_mult(addr, &maddr);
1687 ipv6_dev_mc_inc(dev, &maddr);
1688 }
1689
1690 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1691 {
1692 struct in6_addr maddr;
1693
1694 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1695 return;
1696
1697 addrconf_addr_solict_mult(addr, &maddr);
1698 __ipv6_dev_mc_dec(idev, &maddr);
1699 }
1700
1701 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1702 {
1703 struct in6_addr addr;
1704 if (ifp->prefix_len >= 127) /* RFC 6164 */
1705 return;
1706 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1707 if (ipv6_addr_any(&addr))
1708 return;
1709 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1710 }
1711
1712 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1713 {
1714 struct in6_addr addr;
1715 if (ifp->prefix_len >= 127) /* RFC 6164 */
1716 return;
1717 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1718 if (ipv6_addr_any(&addr))
1719 return;
1720 __ipv6_dev_ac_dec(ifp->idev, &addr);
1721 }
1722
1723 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1724 {
1725 if (dev->addr_len != ETH_ALEN)
1726 return -1;
1727 memcpy(eui, dev->dev_addr, 3);
1728 memcpy(eui + 5, dev->dev_addr + 3, 3);
1729
1730 /*
1731 * The zSeries OSA network cards can be shared among various
1732 * OS instances, but the OSA cards have only one MAC address.
1733 * This leads to duplicate address conflicts in conjunction
1734 * with IPv6 if more than one instance uses the same card.
1735 *
1736 * The driver for these cards can deliver a unique 16-bit
1737 * identifier for each instance sharing the same card. It is
1738 * placed instead of 0xFFFE in the interface identifier. The
1739 * "u" bit of the interface identifier is not inverted in this
1740 * case. Hence the resulting interface identifier has local
1741 * scope according to RFC2373.
1742 */
1743 if (dev->dev_id) {
1744 eui[3] = (dev->dev_id >> 8) & 0xFF;
1745 eui[4] = dev->dev_id & 0xFF;
1746 } else {
1747 eui[3] = 0xFF;
1748 eui[4] = 0xFE;
1749 eui[0] ^= 2;
1750 }
1751 return 0;
1752 }
1753
1754 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1755 {
1756 if (dev->addr_len != IEEE802154_ADDR_LEN)
1757 return -1;
1758 memcpy(eui, dev->dev_addr, 8);
1759 eui[0] ^= 2;
1760 return 0;
1761 }
1762
1763 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1764 {
1765 union fwnet_hwaddr *ha;
1766
1767 if (dev->addr_len != FWNET_ALEN)
1768 return -1;
1769
1770 ha = (union fwnet_hwaddr *)dev->dev_addr;
1771
1772 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1773 eui[0] ^= 2;
1774 return 0;
1775 }
1776
1777 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1778 {
1779 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1780 if (dev->addr_len != ARCNET_ALEN)
1781 return -1;
1782 memset(eui, 0, 7);
1783 eui[7] = *(u8 *)dev->dev_addr;
1784 return 0;
1785 }
1786
1787 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1788 {
1789 if (dev->addr_len != INFINIBAND_ALEN)
1790 return -1;
1791 memcpy(eui, dev->dev_addr + 12, 8);
1792 eui[0] |= 2;
1793 return 0;
1794 }
1795
1796 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1797 {
1798 if (addr == 0)
1799 return -1;
1800 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1801 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1802 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1803 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1804 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1805 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1806 eui[1] = 0;
1807 eui[2] = 0x5E;
1808 eui[3] = 0xFE;
1809 memcpy(eui + 4, &addr, 4);
1810 return 0;
1811 }
1812
1813 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1814 {
1815 if (dev->priv_flags & IFF_ISATAP)
1816 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1817 return -1;
1818 }
1819
1820 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1821 {
1822 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1823 }
1824
1825 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1826 {
1827 memcpy(eui, dev->perm_addr, 3);
1828 memcpy(eui + 5, dev->perm_addr + 3, 3);
1829 eui[3] = 0xFF;
1830 eui[4] = 0xFE;
1831 eui[0] ^= 2;
1832 return 0;
1833 }
1834
1835 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1836 {
1837 switch (dev->type) {
1838 case ARPHRD_ETHER:
1839 case ARPHRD_FDDI:
1840 return addrconf_ifid_eui48(eui, dev);
1841 case ARPHRD_ARCNET:
1842 return addrconf_ifid_arcnet(eui, dev);
1843 case ARPHRD_INFINIBAND:
1844 return addrconf_ifid_infiniband(eui, dev);
1845 case ARPHRD_SIT:
1846 return addrconf_ifid_sit(eui, dev);
1847 case ARPHRD_IPGRE:
1848 return addrconf_ifid_gre(eui, dev);
1849 case ARPHRD_6LOWPAN:
1850 case ARPHRD_IEEE802154:
1851 return addrconf_ifid_eui64(eui, dev);
1852 case ARPHRD_IEEE1394:
1853 return addrconf_ifid_ieee1394(eui, dev);
1854 case ARPHRD_TUNNEL6:
1855 return addrconf_ifid_ip6tnl(eui, dev);
1856 }
1857 return -1;
1858 }
1859
1860 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1861 {
1862 int err = -1;
1863 struct inet6_ifaddr *ifp;
1864
1865 read_lock_bh(&idev->lock);
1866 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1867 if (ifp->scope > IFA_LINK)
1868 break;
1869 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1870 memcpy(eui, ifp->addr.s6_addr+8, 8);
1871 err = 0;
1872 break;
1873 }
1874 }
1875 read_unlock_bh(&idev->lock);
1876 return err;
1877 }
1878
1879 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1880 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1881 {
1882 regen:
1883 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1884 idev->rndid[0] &= ~0x02;
1885
1886 /*
1887 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1888 * check if generated address is not inappropriate
1889 *
1890 * - Reserved subnet anycast (RFC 2526)
1891 * 11111101 11....11 1xxxxxxx
1892 * - ISATAP (RFC4214) 6.1
1893 * 00-00-5E-FE-xx-xx-xx-xx
1894 * - value 0
1895 * - XXX: already assigned to an address on the device
1896 */
1897 if (idev->rndid[0] == 0xfd &&
1898 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1899 (idev->rndid[7]&0x80))
1900 goto regen;
1901 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1902 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1903 goto regen;
1904 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1905 goto regen;
1906 }
1907 }
1908
1909 static void ipv6_regen_rndid(unsigned long data)
1910 {
1911 struct inet6_dev *idev = (struct inet6_dev *) data;
1912 unsigned long expires;
1913
1914 rcu_read_lock_bh();
1915 write_lock_bh(&idev->lock);
1916
1917 if (idev->dead)
1918 goto out;
1919
1920 __ipv6_regen_rndid(idev);
1921
1922 expires = jiffies +
1923 idev->cnf.temp_prefered_lft * HZ -
1924 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1925 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
1926 idev->cnf.max_desync_factor * HZ;
1927 if (time_before(expires, jiffies)) {
1928 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1929 __func__, idev->dev->name);
1930 goto out;
1931 }
1932
1933 if (!mod_timer(&idev->regen_timer, expires))
1934 in6_dev_hold(idev);
1935
1936 out:
1937 write_unlock_bh(&idev->lock);
1938 rcu_read_unlock_bh();
1939 in6_dev_put(idev);
1940 }
1941
1942 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1943 {
1944 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1945 __ipv6_regen_rndid(idev);
1946 }
1947
1948 /*
1949 * Add prefix route.
1950 */
1951
1952 static void
1953 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1954 unsigned long expires, u32 flags)
1955 {
1956 struct fib6_config cfg = {
1957 .fc_table = RT6_TABLE_PREFIX,
1958 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1959 .fc_ifindex = dev->ifindex,
1960 .fc_expires = expires,
1961 .fc_dst_len = plen,
1962 .fc_flags = RTF_UP | flags,
1963 .fc_nlinfo.nl_net = dev_net(dev),
1964 .fc_protocol = RTPROT_KERNEL,
1965 };
1966
1967 cfg.fc_dst = *pfx;
1968
1969 /* Prevent useless cloning on PtP SIT.
1970 This thing is done here expecting that the whole
1971 class of non-broadcast devices need not cloning.
1972 */
1973 #if IS_ENABLED(CONFIG_IPV6_SIT)
1974 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1975 cfg.fc_flags |= RTF_NONEXTHOP;
1976 #endif
1977
1978 ip6_route_add(&cfg);
1979 }
1980
1981
1982 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1983 int plen,
1984 const struct net_device *dev,
1985 u32 flags, u32 noflags)
1986 {
1987 struct fib6_node *fn;
1988 struct rt6_info *rt = NULL;
1989 struct fib6_table *table;
1990
1991 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1992 if (table == NULL)
1993 return NULL;
1994
1995 read_lock_bh(&table->tb6_lock);
1996 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1997 if (!fn)
1998 goto out;
1999 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2000 if (rt->dst.dev->ifindex != dev->ifindex)
2001 continue;
2002 if ((rt->rt6i_flags & flags) != flags)
2003 continue;
2004 if ((rt->rt6i_flags & noflags) != 0)
2005 continue;
2006 dst_hold(&rt->dst);
2007 break;
2008 }
2009 out:
2010 read_unlock_bh(&table->tb6_lock);
2011 return rt;
2012 }
2013
2014
2015 /* Create "default" multicast route to the interface */
2016
2017 static void addrconf_add_mroute(struct net_device *dev)
2018 {
2019 struct fib6_config cfg = {
2020 .fc_table = RT6_TABLE_LOCAL,
2021 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2022 .fc_ifindex = dev->ifindex,
2023 .fc_dst_len = 8,
2024 .fc_flags = RTF_UP,
2025 .fc_nlinfo.nl_net = dev_net(dev),
2026 };
2027
2028 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2029
2030 ip6_route_add(&cfg);
2031 }
2032
2033 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2034 {
2035 struct inet6_dev *idev;
2036
2037 ASSERT_RTNL();
2038
2039 idev = ipv6_find_idev(dev);
2040 if (!idev)
2041 return ERR_PTR(-ENOBUFS);
2042
2043 if (idev->cnf.disable_ipv6)
2044 return ERR_PTR(-EACCES);
2045
2046 /* Add default multicast route */
2047 if (!(dev->flags & IFF_LOOPBACK))
2048 addrconf_add_mroute(dev);
2049
2050 return idev;
2051 }
2052
2053 static void manage_tempaddrs(struct inet6_dev *idev,
2054 struct inet6_ifaddr *ifp,
2055 __u32 valid_lft, __u32 prefered_lft,
2056 bool create, unsigned long now)
2057 {
2058 u32 flags;
2059 struct inet6_ifaddr *ift;
2060
2061 read_lock_bh(&idev->lock);
2062 /* update all temporary addresses in the list */
2063 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2064 int age, max_valid, max_prefered;
2065
2066 if (ifp != ift->ifpub)
2067 continue;
2068
2069 /* RFC 4941 section 3.3:
2070 * If a received option will extend the lifetime of a public
2071 * address, the lifetimes of temporary addresses should
2072 * be extended, subject to the overall constraint that no
2073 * temporary addresses should ever remain "valid" or "preferred"
2074 * for a time longer than (TEMP_VALID_LIFETIME) or
2075 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2076 */
2077 age = (now - ift->cstamp) / HZ;
2078 max_valid = idev->cnf.temp_valid_lft - age;
2079 if (max_valid < 0)
2080 max_valid = 0;
2081
2082 max_prefered = idev->cnf.temp_prefered_lft -
2083 idev->cnf.max_desync_factor - age;
2084 if (max_prefered < 0)
2085 max_prefered = 0;
2086
2087 if (valid_lft > max_valid)
2088 valid_lft = max_valid;
2089
2090 if (prefered_lft > max_prefered)
2091 prefered_lft = max_prefered;
2092
2093 spin_lock(&ift->lock);
2094 flags = ift->flags;
2095 ift->valid_lft = valid_lft;
2096 ift->prefered_lft = prefered_lft;
2097 ift->tstamp = now;
2098 if (prefered_lft > 0)
2099 ift->flags &= ~IFA_F_DEPRECATED;
2100
2101 spin_unlock(&ift->lock);
2102 if (!(flags&IFA_F_TENTATIVE))
2103 ipv6_ifa_notify(0, ift);
2104 }
2105
2106 if ((create || list_empty(&idev->tempaddr_list)) &&
2107 idev->cnf.use_tempaddr > 0) {
2108 /* When a new public address is created as described
2109 * in [ADDRCONF], also create a new temporary address.
2110 * Also create a temporary address if it's enabled but
2111 * no temporary address currently exists.
2112 */
2113 read_unlock_bh(&idev->lock);
2114 ipv6_create_tempaddr(ifp, NULL);
2115 } else {
2116 read_unlock_bh(&idev->lock);
2117 }
2118 }
2119
2120 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2121 {
2122 struct prefix_info *pinfo;
2123 __u32 valid_lft;
2124 __u32 prefered_lft;
2125 int addr_type;
2126 struct inet6_dev *in6_dev;
2127 struct net *net = dev_net(dev);
2128
2129 pinfo = (struct prefix_info *) opt;
2130
2131 if (len < sizeof(struct prefix_info)) {
2132 ADBG("addrconf: prefix option too short\n");
2133 return;
2134 }
2135
2136 /*
2137 * Validation checks ([ADDRCONF], page 19)
2138 */
2139
2140 addr_type = ipv6_addr_type(&pinfo->prefix);
2141
2142 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2143 return;
2144
2145 valid_lft = ntohl(pinfo->valid);
2146 prefered_lft = ntohl(pinfo->prefered);
2147
2148 if (prefered_lft > valid_lft) {
2149 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2150 return;
2151 }
2152
2153 in6_dev = in6_dev_get(dev);
2154
2155 if (in6_dev == NULL) {
2156 net_dbg_ratelimited("addrconf: device %s not configured\n",
2157 dev->name);
2158 return;
2159 }
2160
2161 /*
2162 * Two things going on here:
2163 * 1) Add routes for on-link prefixes
2164 * 2) Configure prefixes with the auto flag set
2165 */
2166
2167 if (pinfo->onlink) {
2168 struct rt6_info *rt;
2169 unsigned long rt_expires;
2170
2171 /* Avoid arithmetic overflow. Really, we could
2172 * save rt_expires in seconds, likely valid_lft,
2173 * but it would require division in fib gc, that it
2174 * not good.
2175 */
2176 if (HZ > USER_HZ)
2177 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2178 else
2179 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2180
2181 if (addrconf_finite_timeout(rt_expires))
2182 rt_expires *= HZ;
2183
2184 rt = addrconf_get_prefix_route(&pinfo->prefix,
2185 pinfo->prefix_len,
2186 dev,
2187 RTF_ADDRCONF | RTF_PREFIX_RT,
2188 RTF_GATEWAY | RTF_DEFAULT);
2189
2190 if (rt) {
2191 /* Autoconf prefix route */
2192 if (valid_lft == 0) {
2193 ip6_del_rt(rt);
2194 rt = NULL;
2195 } else if (addrconf_finite_timeout(rt_expires)) {
2196 /* not infinity */
2197 rt6_set_expires(rt, jiffies + rt_expires);
2198 } else {
2199 rt6_clean_expires(rt);
2200 }
2201 } else if (valid_lft) {
2202 clock_t expires = 0;
2203 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2204 if (addrconf_finite_timeout(rt_expires)) {
2205 /* not infinity */
2206 flags |= RTF_EXPIRES;
2207 expires = jiffies_to_clock_t(rt_expires);
2208 }
2209 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2210 dev, expires, flags);
2211 }
2212 ip6_rt_put(rt);
2213 }
2214
2215 /* Try to figure out our local address for this prefix */
2216
2217 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2218 struct inet6_ifaddr *ifp;
2219 struct in6_addr addr;
2220 int create = 0, update_lft = 0;
2221 bool tokenized = false;
2222
2223 if (pinfo->prefix_len == 64) {
2224 memcpy(&addr, &pinfo->prefix, 8);
2225
2226 if (!ipv6_addr_any(&in6_dev->token)) {
2227 read_lock_bh(&in6_dev->lock);
2228 memcpy(addr.s6_addr + 8,
2229 in6_dev->token.s6_addr + 8, 8);
2230 read_unlock_bh(&in6_dev->lock);
2231 tokenized = true;
2232 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2233 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2234 in6_dev_put(in6_dev);
2235 return;
2236 }
2237 goto ok;
2238 }
2239 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2240 pinfo->prefix_len);
2241 in6_dev_put(in6_dev);
2242 return;
2243
2244 ok:
2245
2246 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2247
2248 if (ifp == NULL && valid_lft) {
2249 int max_addresses = in6_dev->cnf.max_addresses;
2250 u32 addr_flags = 0;
2251
2252 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2253 if (in6_dev->cnf.optimistic_dad &&
2254 !net->ipv6.devconf_all->forwarding && sllao)
2255 addr_flags = IFA_F_OPTIMISTIC;
2256 #endif
2257
2258 /* Do not allow to create too much of autoconfigured
2259 * addresses; this would be too easy way to crash kernel.
2260 */
2261 if (!max_addresses ||
2262 ipv6_count_addresses(in6_dev) < max_addresses)
2263 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2264 pinfo->prefix_len,
2265 addr_type&IPV6_ADDR_SCOPE_MASK,
2266 addr_flags, valid_lft,
2267 prefered_lft);
2268
2269 if (IS_ERR_OR_NULL(ifp)) {
2270 in6_dev_put(in6_dev);
2271 return;
2272 }
2273
2274 ifp->flags |= IFA_F_MANAGETEMPADDR;
2275 update_lft = 0;
2276 create = 1;
2277 ifp->cstamp = jiffies;
2278 ifp->tokenized = tokenized;
2279 addrconf_dad_start(ifp);
2280 }
2281
2282 if (ifp) {
2283 u32 flags;
2284 unsigned long now;
2285 u32 stored_lft;
2286
2287 /* update lifetime (RFC2462 5.5.3 e) */
2288 spin_lock(&ifp->lock);
2289 now = jiffies;
2290 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2291 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2292 else
2293 stored_lft = 0;
2294 if (!update_lft && !create && stored_lft) {
2295 const u32 minimum_lft = min(
2296 stored_lft, (u32)MIN_VALID_LIFETIME);
2297 valid_lft = max(valid_lft, minimum_lft);
2298
2299 /* RFC4862 Section 5.5.3e:
2300 * "Note that the preferred lifetime of the
2301 * corresponding address is always reset to
2302 * the Preferred Lifetime in the received
2303 * Prefix Information option, regardless of
2304 * whether the valid lifetime is also reset or
2305 * ignored."
2306 *
2307 * So we should always update prefered_lft here.
2308 */
2309 update_lft = 1;
2310 }
2311
2312 if (update_lft) {
2313 ifp->valid_lft = valid_lft;
2314 ifp->prefered_lft = prefered_lft;
2315 ifp->tstamp = now;
2316 flags = ifp->flags;
2317 ifp->flags &= ~IFA_F_DEPRECATED;
2318 spin_unlock(&ifp->lock);
2319
2320 if (!(flags&IFA_F_TENTATIVE))
2321 ipv6_ifa_notify(0, ifp);
2322 } else
2323 spin_unlock(&ifp->lock);
2324
2325 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2326 create, now);
2327
2328 in6_ifa_put(ifp);
2329 addrconf_verify(0);
2330 }
2331 }
2332 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2333 in6_dev_put(in6_dev);
2334 }
2335
2336 /*
2337 * Set destination address.
2338 * Special case for SIT interfaces where we create a new "virtual"
2339 * device.
2340 */
2341 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2342 {
2343 struct in6_ifreq ireq;
2344 struct net_device *dev;
2345 int err = -EINVAL;
2346
2347 rtnl_lock();
2348
2349 err = -EFAULT;
2350 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2351 goto err_exit;
2352
2353 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2354
2355 err = -ENODEV;
2356 if (dev == NULL)
2357 goto err_exit;
2358
2359 #if IS_ENABLED(CONFIG_IPV6_SIT)
2360 if (dev->type == ARPHRD_SIT) {
2361 const struct net_device_ops *ops = dev->netdev_ops;
2362 struct ifreq ifr;
2363 struct ip_tunnel_parm p;
2364
2365 err = -EADDRNOTAVAIL;
2366 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2367 goto err_exit;
2368
2369 memset(&p, 0, sizeof(p));
2370 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2371 p.iph.saddr = 0;
2372 p.iph.version = 4;
2373 p.iph.ihl = 5;
2374 p.iph.protocol = IPPROTO_IPV6;
2375 p.iph.ttl = 64;
2376 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2377
2378 if (ops->ndo_do_ioctl) {
2379 mm_segment_t oldfs = get_fs();
2380
2381 set_fs(KERNEL_DS);
2382 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2383 set_fs(oldfs);
2384 } else
2385 err = -EOPNOTSUPP;
2386
2387 if (err == 0) {
2388 err = -ENOBUFS;
2389 dev = __dev_get_by_name(net, p.name);
2390 if (!dev)
2391 goto err_exit;
2392 err = dev_open(dev);
2393 }
2394 }
2395 #endif
2396
2397 err_exit:
2398 rtnl_unlock();
2399 return err;
2400 }
2401
2402 /*
2403 * Manual configuration of address on an interface
2404 */
2405 static int inet6_addr_add(struct net *net, int ifindex,
2406 const struct in6_addr *pfx,
2407 const struct in6_addr *peer_pfx,
2408 unsigned int plen, __u32 ifa_flags,
2409 __u32 prefered_lft, __u32 valid_lft)
2410 {
2411 struct inet6_ifaddr *ifp;
2412 struct inet6_dev *idev;
2413 struct net_device *dev;
2414 int scope;
2415 u32 flags;
2416 clock_t expires;
2417 unsigned long timeout;
2418
2419 ASSERT_RTNL();
2420
2421 if (plen > 128)
2422 return -EINVAL;
2423
2424 /* check the lifetime */
2425 if (!valid_lft || prefered_lft > valid_lft)
2426 return -EINVAL;
2427
2428 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2429 return -EINVAL;
2430
2431 dev = __dev_get_by_index(net, ifindex);
2432 if (!dev)
2433 return -ENODEV;
2434
2435 idev = addrconf_add_dev(dev);
2436 if (IS_ERR(idev))
2437 return PTR_ERR(idev);
2438
2439 scope = ipv6_addr_scope(pfx);
2440
2441 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2442 if (addrconf_finite_timeout(timeout)) {
2443 expires = jiffies_to_clock_t(timeout * HZ);
2444 valid_lft = timeout;
2445 flags = RTF_EXPIRES;
2446 } else {
2447 expires = 0;
2448 flags = 0;
2449 ifa_flags |= IFA_F_PERMANENT;
2450 }
2451
2452 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2453 if (addrconf_finite_timeout(timeout)) {
2454 if (timeout == 0)
2455 ifa_flags |= IFA_F_DEPRECATED;
2456 prefered_lft = timeout;
2457 }
2458
2459 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2460 valid_lft, prefered_lft);
2461
2462 if (!IS_ERR(ifp)) {
2463 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2464 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2465 expires, flags);
2466 }
2467
2468 /*
2469 * Note that section 3.1 of RFC 4429 indicates
2470 * that the Optimistic flag should not be set for
2471 * manually configured addresses
2472 */
2473 addrconf_dad_start(ifp);
2474 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2475 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2476 true, jiffies);
2477 in6_ifa_put(ifp);
2478 addrconf_verify(0);
2479 return 0;
2480 }
2481
2482 return PTR_ERR(ifp);
2483 }
2484
2485 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2486 unsigned int plen)
2487 {
2488 struct inet6_ifaddr *ifp;
2489 struct inet6_dev *idev;
2490 struct net_device *dev;
2491
2492 if (plen > 128)
2493 return -EINVAL;
2494
2495 dev = __dev_get_by_index(net, ifindex);
2496 if (!dev)
2497 return -ENODEV;
2498
2499 if ((idev = __in6_dev_get(dev)) == NULL)
2500 return -ENXIO;
2501
2502 read_lock_bh(&idev->lock);
2503 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2504 if (ifp->prefix_len == plen &&
2505 ipv6_addr_equal(pfx, &ifp->addr)) {
2506 in6_ifa_hold(ifp);
2507 read_unlock_bh(&idev->lock);
2508
2509 ipv6_del_addr(ifp);
2510 return 0;
2511 }
2512 }
2513 read_unlock_bh(&idev->lock);
2514 return -EADDRNOTAVAIL;
2515 }
2516
2517
2518 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2519 {
2520 struct in6_ifreq ireq;
2521 int err;
2522
2523 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2524 return -EPERM;
2525
2526 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2527 return -EFAULT;
2528
2529 rtnl_lock();
2530 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2531 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2532 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2533 rtnl_unlock();
2534 return err;
2535 }
2536
2537 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2538 {
2539 struct in6_ifreq ireq;
2540 int err;
2541
2542 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2543 return -EPERM;
2544
2545 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2546 return -EFAULT;
2547
2548 rtnl_lock();
2549 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2550 ireq.ifr6_prefixlen);
2551 rtnl_unlock();
2552 return err;
2553 }
2554
2555 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2556 int plen, int scope)
2557 {
2558 struct inet6_ifaddr *ifp;
2559
2560 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2561 scope, IFA_F_PERMANENT,
2562 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2563 if (!IS_ERR(ifp)) {
2564 spin_lock_bh(&ifp->lock);
2565 ifp->flags &= ~IFA_F_TENTATIVE;
2566 spin_unlock_bh(&ifp->lock);
2567 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2568 in6_ifa_put(ifp);
2569 }
2570 }
2571
2572 #if IS_ENABLED(CONFIG_IPV6_SIT)
2573 static void sit_add_v4_addrs(struct inet6_dev *idev)
2574 {
2575 struct in6_addr addr;
2576 struct net_device *dev;
2577 struct net *net = dev_net(idev->dev);
2578 int scope, plen;
2579 u32 pflags = 0;
2580
2581 ASSERT_RTNL();
2582
2583 memset(&addr, 0, sizeof(struct in6_addr));
2584 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2585
2586 if (idev->dev->flags&IFF_POINTOPOINT) {
2587 addr.s6_addr32[0] = htonl(0xfe800000);
2588 scope = IFA_LINK;
2589 plen = 64;
2590 } else {
2591 scope = IPV6_ADDR_COMPATv4;
2592 plen = 96;
2593 pflags |= RTF_NONEXTHOP;
2594 }
2595
2596 if (addr.s6_addr32[3]) {
2597 add_addr(idev, &addr, plen, scope);
2598 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2599 return;
2600 }
2601
2602 for_each_netdev(net, dev) {
2603 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2604 if (in_dev && (dev->flags & IFF_UP)) {
2605 struct in_ifaddr *ifa;
2606
2607 int flag = scope;
2608
2609 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2610
2611 addr.s6_addr32[3] = ifa->ifa_local;
2612
2613 if (ifa->ifa_scope == RT_SCOPE_LINK)
2614 continue;
2615 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2616 if (idev->dev->flags&IFF_POINTOPOINT)
2617 continue;
2618 flag |= IFA_HOST;
2619 }
2620
2621 add_addr(idev, &addr, plen, flag);
2622 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2623 pflags);
2624 }
2625 }
2626 }
2627 }
2628 #endif
2629
2630 static void init_loopback(struct net_device *dev)
2631 {
2632 struct inet6_dev *idev;
2633 struct net_device *sp_dev;
2634 struct inet6_ifaddr *sp_ifa;
2635 struct rt6_info *sp_rt;
2636
2637 /* ::1 */
2638
2639 ASSERT_RTNL();
2640
2641 if ((idev = ipv6_find_idev(dev)) == NULL) {
2642 pr_debug("%s: add_dev failed\n", __func__);
2643 return;
2644 }
2645
2646 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2647
2648 /* Add routes to other interface's IPv6 addresses */
2649 for_each_netdev(dev_net(dev), sp_dev) {
2650 if (!strcmp(sp_dev->name, dev->name))
2651 continue;
2652
2653 idev = __in6_dev_get(sp_dev);
2654 if (!idev)
2655 continue;
2656
2657 read_lock_bh(&idev->lock);
2658 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2659
2660 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2661 continue;
2662
2663 if (sp_ifa->rt) {
2664 /* This dst has been added to garbage list when
2665 * lo device down, release this obsolete dst and
2666 * reallocate a new router for ifa.
2667 */
2668 if (sp_ifa->rt->dst.obsolete > 0) {
2669 ip6_rt_put(sp_ifa->rt);
2670 sp_ifa->rt = NULL;
2671 } else {
2672 continue;
2673 }
2674 }
2675
2676 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2677
2678 /* Failure cases are ignored */
2679 if (!IS_ERR(sp_rt)) {
2680 sp_ifa->rt = sp_rt;
2681 ip6_ins_rt(sp_rt);
2682 }
2683 }
2684 read_unlock_bh(&idev->lock);
2685 }
2686 }
2687
2688 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2689 {
2690 struct inet6_ifaddr *ifp;
2691 u32 addr_flags = IFA_F_PERMANENT;
2692
2693 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2694 if (idev->cnf.optimistic_dad &&
2695 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2696 addr_flags |= IFA_F_OPTIMISTIC;
2697 #endif
2698
2699
2700 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2701 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2702 if (!IS_ERR(ifp)) {
2703 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2704 addrconf_dad_start(ifp);
2705 in6_ifa_put(ifp);
2706 }
2707 }
2708
2709 static void addrconf_dev_config(struct net_device *dev)
2710 {
2711 struct in6_addr addr;
2712 struct inet6_dev *idev;
2713
2714 ASSERT_RTNL();
2715
2716 if ((dev->type != ARPHRD_ETHER) &&
2717 (dev->type != ARPHRD_FDDI) &&
2718 (dev->type != ARPHRD_ARCNET) &&
2719 (dev->type != ARPHRD_INFINIBAND) &&
2720 (dev->type != ARPHRD_IEEE802154) &&
2721 (dev->type != ARPHRD_IEEE1394) &&
2722 (dev->type != ARPHRD_TUNNEL6) &&
2723 (dev->type != ARPHRD_6LOWPAN)) {
2724 /* Alas, we support only Ethernet autoconfiguration. */
2725 return;
2726 }
2727
2728 idev = addrconf_add_dev(dev);
2729 if (IS_ERR(idev))
2730 return;
2731
2732 memset(&addr, 0, sizeof(struct in6_addr));
2733 addr.s6_addr32[0] = htonl(0xFE800000);
2734
2735 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2736 addrconf_add_linklocal(idev, &addr);
2737 }
2738
2739 #if IS_ENABLED(CONFIG_IPV6_SIT)
2740 static void addrconf_sit_config(struct net_device *dev)
2741 {
2742 struct inet6_dev *idev;
2743
2744 ASSERT_RTNL();
2745
2746 /*
2747 * Configure the tunnel with one of our IPv4
2748 * addresses... we should configure all of
2749 * our v4 addrs in the tunnel
2750 */
2751
2752 if ((idev = ipv6_find_idev(dev)) == NULL) {
2753 pr_debug("%s: add_dev failed\n", __func__);
2754 return;
2755 }
2756
2757 if (dev->priv_flags & IFF_ISATAP) {
2758 struct in6_addr addr;
2759
2760 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2761 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2762 addrconf_add_linklocal(idev, &addr);
2763 return;
2764 }
2765
2766 sit_add_v4_addrs(idev);
2767
2768 if (dev->flags&IFF_POINTOPOINT)
2769 addrconf_add_mroute(dev);
2770 }
2771 #endif
2772
2773 #if IS_ENABLED(CONFIG_NET_IPGRE)
2774 static void addrconf_gre_config(struct net_device *dev)
2775 {
2776 struct inet6_dev *idev;
2777 struct in6_addr addr;
2778
2779 ASSERT_RTNL();
2780
2781 if ((idev = ipv6_find_idev(dev)) == NULL) {
2782 pr_debug("%s: add_dev failed\n", __func__);
2783 return;
2784 }
2785
2786 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2787 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2788 addrconf_add_linklocal(idev, &addr);
2789 else
2790 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2791 }
2792 #endif
2793
2794 static inline int
2795 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2796 {
2797 struct in6_addr lladdr;
2798
2799 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2800 addrconf_add_linklocal(idev, &lladdr);
2801 return 0;
2802 }
2803 return -1;
2804 }
2805
2806 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2807 void *ptr)
2808 {
2809 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2810 struct inet6_dev *idev = __in6_dev_get(dev);
2811 int run_pending = 0;
2812 int err;
2813
2814 switch (event) {
2815 case NETDEV_REGISTER:
2816 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2817 idev = ipv6_add_dev(dev);
2818 if (!idev)
2819 return notifier_from_errno(-ENOMEM);
2820 }
2821 break;
2822
2823 case NETDEV_UP:
2824 case NETDEV_CHANGE:
2825 if (dev->flags & IFF_SLAVE)
2826 break;
2827
2828 if (event == NETDEV_UP) {
2829 if (!addrconf_qdisc_ok(dev)) {
2830 /* device is not ready yet. */
2831 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2832 dev->name);
2833 break;
2834 }
2835
2836 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2837 idev = ipv6_add_dev(dev);
2838
2839 if (idev) {
2840 idev->if_flags |= IF_READY;
2841 run_pending = 1;
2842 }
2843 } else {
2844 if (!addrconf_qdisc_ok(dev)) {
2845 /* device is still not ready. */
2846 break;
2847 }
2848
2849 if (idev) {
2850 if (idev->if_flags & IF_READY)
2851 /* device is already configured. */
2852 break;
2853 idev->if_flags |= IF_READY;
2854 }
2855
2856 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2857 dev->name);
2858
2859 run_pending = 1;
2860 }
2861
2862 switch (dev->type) {
2863 #if IS_ENABLED(CONFIG_IPV6_SIT)
2864 case ARPHRD_SIT:
2865 addrconf_sit_config(dev);
2866 break;
2867 #endif
2868 #if IS_ENABLED(CONFIG_NET_IPGRE)
2869 case ARPHRD_IPGRE:
2870 addrconf_gre_config(dev);
2871 break;
2872 #endif
2873 case ARPHRD_LOOPBACK:
2874 init_loopback(dev);
2875 break;
2876
2877 default:
2878 addrconf_dev_config(dev);
2879 break;
2880 }
2881
2882 if (idev) {
2883 if (run_pending)
2884 addrconf_dad_run(idev);
2885
2886 /*
2887 * If the MTU changed during the interface down,
2888 * when the interface up, the changed MTU must be
2889 * reflected in the idev as well as routers.
2890 */
2891 if (idev->cnf.mtu6 != dev->mtu &&
2892 dev->mtu >= IPV6_MIN_MTU) {
2893 rt6_mtu_change(dev, dev->mtu);
2894 idev->cnf.mtu6 = dev->mtu;
2895 }
2896 idev->tstamp = jiffies;
2897 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2898
2899 /*
2900 * If the changed mtu during down is lower than
2901 * IPV6_MIN_MTU stop IPv6 on this interface.
2902 */
2903 if (dev->mtu < IPV6_MIN_MTU)
2904 addrconf_ifdown(dev, 1);
2905 }
2906 break;
2907
2908 case NETDEV_CHANGEMTU:
2909 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2910 rt6_mtu_change(dev, dev->mtu);
2911 idev->cnf.mtu6 = dev->mtu;
2912 break;
2913 }
2914
2915 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2916 idev = ipv6_add_dev(dev);
2917 if (idev)
2918 break;
2919 }
2920
2921 /*
2922 * if MTU under IPV6_MIN_MTU.
2923 * Stop IPv6 on this interface.
2924 */
2925
2926 case NETDEV_DOWN:
2927 case NETDEV_UNREGISTER:
2928 /*
2929 * Remove all addresses from this interface.
2930 */
2931 addrconf_ifdown(dev, event != NETDEV_DOWN);
2932 break;
2933
2934 case NETDEV_CHANGENAME:
2935 if (idev) {
2936 snmp6_unregister_dev(idev);
2937 addrconf_sysctl_unregister(idev);
2938 addrconf_sysctl_register(idev);
2939 err = snmp6_register_dev(idev);
2940 if (err)
2941 return notifier_from_errno(err);
2942 }
2943 break;
2944
2945 case NETDEV_PRE_TYPE_CHANGE:
2946 case NETDEV_POST_TYPE_CHANGE:
2947 addrconf_type_change(dev, event);
2948 break;
2949 }
2950
2951 return NOTIFY_OK;
2952 }
2953
2954 /*
2955 * addrconf module should be notified of a device going up
2956 */
2957 static struct notifier_block ipv6_dev_notf = {
2958 .notifier_call = addrconf_notify,
2959 };
2960
2961 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2962 {
2963 struct inet6_dev *idev;
2964 ASSERT_RTNL();
2965
2966 idev = __in6_dev_get(dev);
2967
2968 if (event == NETDEV_POST_TYPE_CHANGE)
2969 ipv6_mc_remap(idev);
2970 else if (event == NETDEV_PRE_TYPE_CHANGE)
2971 ipv6_mc_unmap(idev);
2972 }
2973
2974 static int addrconf_ifdown(struct net_device *dev, int how)
2975 {
2976 struct net *net = dev_net(dev);
2977 struct inet6_dev *idev;
2978 struct inet6_ifaddr *ifa;
2979 int state, i;
2980
2981 ASSERT_RTNL();
2982
2983 rt6_ifdown(net, dev);
2984 neigh_ifdown(&nd_tbl, dev);
2985
2986 idev = __in6_dev_get(dev);
2987 if (idev == NULL)
2988 return -ENODEV;
2989
2990 /*
2991 * Step 1: remove reference to ipv6 device from parent device.
2992 * Do not dev_put!
2993 */
2994 if (how) {
2995 idev->dead = 1;
2996
2997 /* protected by rtnl_lock */
2998 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2999
3000 /* Step 1.5: remove snmp6 entry */
3001 snmp6_unregister_dev(idev);
3002
3003 }
3004
3005 /* Step 2: clear hash table */
3006 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3007 struct hlist_head *h = &inet6_addr_lst[i];
3008
3009 spin_lock_bh(&addrconf_hash_lock);
3010 restart:
3011 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3012 if (ifa->idev == idev) {
3013 hlist_del_init_rcu(&ifa->addr_lst);
3014 addrconf_del_dad_timer(ifa);
3015 goto restart;
3016 }
3017 }
3018 spin_unlock_bh(&addrconf_hash_lock);
3019 }
3020
3021 write_lock_bh(&idev->lock);
3022
3023 addrconf_del_rs_timer(idev);
3024
3025 /* Step 2: clear flags for stateless addrconf */
3026 if (!how)
3027 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3028
3029 if (how && del_timer(&idev->regen_timer))
3030 in6_dev_put(idev);
3031
3032 /* Step 3: clear tempaddr list */
3033 while (!list_empty(&idev->tempaddr_list)) {
3034 ifa = list_first_entry(&idev->tempaddr_list,
3035 struct inet6_ifaddr, tmp_list);
3036 list_del(&ifa->tmp_list);
3037 write_unlock_bh(&idev->lock);
3038 spin_lock_bh(&ifa->lock);
3039
3040 if (ifa->ifpub) {
3041 in6_ifa_put(ifa->ifpub);
3042 ifa->ifpub = NULL;
3043 }
3044 spin_unlock_bh(&ifa->lock);
3045 in6_ifa_put(ifa);
3046 write_lock_bh(&idev->lock);
3047 }
3048
3049 while (!list_empty(&idev->addr_list)) {
3050 ifa = list_first_entry(&idev->addr_list,
3051 struct inet6_ifaddr, if_list);
3052 addrconf_del_dad_timer(ifa);
3053
3054 list_del(&ifa->if_list);
3055
3056 write_unlock_bh(&idev->lock);
3057
3058 spin_lock_bh(&ifa->state_lock);
3059 state = ifa->state;
3060 ifa->state = INET6_IFADDR_STATE_DEAD;
3061 spin_unlock_bh(&ifa->state_lock);
3062
3063 if (state != INET6_IFADDR_STATE_DEAD) {
3064 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3065 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3066 }
3067 in6_ifa_put(ifa);
3068
3069 write_lock_bh(&idev->lock);
3070 }
3071
3072 write_unlock_bh(&idev->lock);
3073
3074 /* Step 5: Discard multicast list */
3075 if (how)
3076 ipv6_mc_destroy_dev(idev);
3077 else
3078 ipv6_mc_down(idev);
3079
3080 idev->tstamp = jiffies;
3081
3082 /* Last: Shot the device (if unregistered) */
3083 if (how) {
3084 addrconf_sysctl_unregister(idev);
3085 neigh_parms_release(&nd_tbl, idev->nd_parms);
3086 neigh_ifdown(&nd_tbl, dev);
3087 in6_dev_put(idev);
3088 }
3089 return 0;
3090 }
3091
3092 static void addrconf_rs_timer(unsigned long data)
3093 {
3094 struct inet6_dev *idev = (struct inet6_dev *)data;
3095 struct net_device *dev = idev->dev;
3096 struct in6_addr lladdr;
3097
3098 write_lock(&idev->lock);
3099 if (idev->dead || !(idev->if_flags & IF_READY))
3100 goto out;
3101
3102 if (!ipv6_accept_ra(idev))
3103 goto out;
3104
3105 /* Announcement received after solicitation was sent */
3106 if (idev->if_flags & IF_RA_RCVD)
3107 goto out;
3108
3109 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3110 write_unlock(&idev->lock);
3111 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3112 ndisc_send_rs(dev, &lladdr,
3113 &in6addr_linklocal_allrouters);
3114 else
3115 goto put;
3116
3117 write_lock(&idev->lock);
3118 /* The wait after the last probe can be shorter */
3119 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3120 idev->cnf.rtr_solicits) ?
3121 idev->cnf.rtr_solicit_delay :
3122 idev->cnf.rtr_solicit_interval);
3123 } else {
3124 /*
3125 * Note: we do not support deprecated "all on-link"
3126 * assumption any longer.
3127 */
3128 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3129 }
3130
3131 out:
3132 write_unlock(&idev->lock);
3133 put:
3134 in6_dev_put(idev);
3135 }
3136
3137 /*
3138 * Duplicate Address Detection
3139 */
3140 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3141 {
3142 unsigned long rand_num;
3143 struct inet6_dev *idev = ifp->idev;
3144
3145 if (ifp->flags & IFA_F_OPTIMISTIC)
3146 rand_num = 0;
3147 else
3148 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3149
3150 ifp->dad_probes = idev->cnf.dad_transmits;
3151 addrconf_mod_dad_timer(ifp, rand_num);
3152 }
3153
3154 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3155 {
3156 struct inet6_dev *idev = ifp->idev;
3157 struct net_device *dev = idev->dev;
3158
3159 addrconf_join_solict(dev, &ifp->addr);
3160
3161 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3162
3163 read_lock_bh(&idev->lock);
3164 spin_lock(&ifp->lock);
3165 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3166 goto out;
3167
3168 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3169 idev->cnf.accept_dad < 1 ||
3170 !(ifp->flags&IFA_F_TENTATIVE) ||
3171 ifp->flags & IFA_F_NODAD) {
3172 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3173 spin_unlock(&ifp->lock);
3174 read_unlock_bh(&idev->lock);
3175
3176 addrconf_dad_completed(ifp);
3177 return;
3178 }
3179
3180 if (!(idev->if_flags & IF_READY)) {
3181 spin_unlock(&ifp->lock);
3182 read_unlock_bh(&idev->lock);
3183 /*
3184 * If the device is not ready:
3185 * - keep it tentative if it is a permanent address.
3186 * - otherwise, kill it.
3187 */
3188 in6_ifa_hold(ifp);
3189 addrconf_dad_stop(ifp, 0);
3190 return;
3191 }
3192
3193 /*
3194 * Optimistic nodes can start receiving
3195 * Frames right away
3196 */
3197 if (ifp->flags & IFA_F_OPTIMISTIC)
3198 ip6_ins_rt(ifp->rt);
3199
3200 addrconf_dad_kick(ifp);
3201 out:
3202 spin_unlock(&ifp->lock);
3203 read_unlock_bh(&idev->lock);
3204 }
3205
3206 static void addrconf_dad_timer(unsigned long data)
3207 {
3208 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3209 struct inet6_dev *idev = ifp->idev;
3210 struct in6_addr mcaddr;
3211
3212 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3213 goto out;
3214
3215 write_lock(&idev->lock);
3216 if (idev->dead || !(idev->if_flags & IF_READY)) {
3217 write_unlock(&idev->lock);
3218 goto out;
3219 }
3220
3221 spin_lock(&ifp->lock);
3222 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3223 spin_unlock(&ifp->lock);
3224 write_unlock(&idev->lock);
3225 goto out;
3226 }
3227
3228 if (ifp->dad_probes == 0) {
3229 /*
3230 * DAD was successful
3231 */
3232
3233 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3234 spin_unlock(&ifp->lock);
3235 write_unlock(&idev->lock);
3236
3237 addrconf_dad_completed(ifp);
3238
3239 goto out;
3240 }
3241
3242 ifp->dad_probes--;
3243 addrconf_mod_dad_timer(ifp,
3244 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3245 spin_unlock(&ifp->lock);
3246 write_unlock(&idev->lock);
3247
3248 /* send a neighbour solicitation for our addr */
3249 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3250 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3251 out:
3252 in6_ifa_put(ifp);
3253 }
3254
3255 /* ifp->idev must be at least read locked */
3256 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3257 {
3258 struct inet6_ifaddr *ifpiter;
3259 struct inet6_dev *idev = ifp->idev;
3260
3261 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3262 if (ifpiter->scope > IFA_LINK)
3263 break;
3264 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3265 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3266 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3267 IFA_F_PERMANENT)
3268 return false;
3269 }
3270 return true;
3271 }
3272
3273 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3274 {
3275 struct net_device *dev = ifp->idev->dev;
3276 struct in6_addr lladdr;
3277 bool send_rs, send_mld;
3278
3279 addrconf_del_dad_timer(ifp);
3280
3281 /*
3282 * Configure the address for reception. Now it is valid.
3283 */
3284
3285 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3286
3287 /* If added prefix is link local and we are prepared to process
3288 router advertisements, start sending router solicitations.
3289 */
3290
3291 read_lock_bh(&ifp->idev->lock);
3292 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3293 send_rs = send_mld &&
3294 ipv6_accept_ra(ifp->idev) &&
3295 ifp->idev->cnf.rtr_solicits > 0 &&
3296 (dev->flags&IFF_LOOPBACK) == 0;
3297 read_unlock_bh(&ifp->idev->lock);
3298
3299 /* While dad is in progress mld report's source address is in6_addrany.
3300 * Resend with proper ll now.
3301 */
3302 if (send_mld)
3303 ipv6_mc_dad_complete(ifp->idev);
3304
3305 if (send_rs) {
3306 /*
3307 * If a host as already performed a random delay
3308 * [...] as part of DAD [...] there is no need
3309 * to delay again before sending the first RS
3310 */
3311 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3312 return;
3313 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3314
3315 write_lock_bh(&ifp->idev->lock);
3316 spin_lock(&ifp->lock);
3317 ifp->idev->rs_probes = 1;
3318 ifp->idev->if_flags |= IF_RS_SENT;
3319 addrconf_mod_rs_timer(ifp->idev,
3320 ifp->idev->cnf.rtr_solicit_interval);
3321 spin_unlock(&ifp->lock);
3322 write_unlock_bh(&ifp->idev->lock);
3323 }
3324 }
3325
3326 static void addrconf_dad_run(struct inet6_dev *idev)
3327 {
3328 struct inet6_ifaddr *ifp;
3329
3330 read_lock_bh(&idev->lock);
3331 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3332 spin_lock(&ifp->lock);
3333 if (ifp->flags & IFA_F_TENTATIVE &&
3334 ifp->state == INET6_IFADDR_STATE_DAD)
3335 addrconf_dad_kick(ifp);
3336 spin_unlock(&ifp->lock);
3337 }
3338 read_unlock_bh(&idev->lock);
3339 }
3340
3341 #ifdef CONFIG_PROC_FS
3342 struct if6_iter_state {
3343 struct seq_net_private p;
3344 int bucket;
3345 int offset;
3346 };
3347
3348 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3349 {
3350 struct inet6_ifaddr *ifa = NULL;
3351 struct if6_iter_state *state = seq->private;
3352 struct net *net = seq_file_net(seq);
3353 int p = 0;
3354
3355 /* initial bucket if pos is 0 */
3356 if (pos == 0) {
3357 state->bucket = 0;
3358 state->offset = 0;
3359 }
3360
3361 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3362 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3363 addr_lst) {
3364 if (!net_eq(dev_net(ifa->idev->dev), net))
3365 continue;
3366 /* sync with offset */
3367 if (p < state->offset) {
3368 p++;
3369 continue;
3370 }
3371 state->offset++;
3372 return ifa;
3373 }
3374
3375 /* prepare for next bucket */
3376 state->offset = 0;
3377 p = 0;
3378 }
3379 return NULL;
3380 }
3381
3382 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3383 struct inet6_ifaddr *ifa)
3384 {
3385 struct if6_iter_state *state = seq->private;
3386 struct net *net = seq_file_net(seq);
3387
3388 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3389 if (!net_eq(dev_net(ifa->idev->dev), net))
3390 continue;
3391 state->offset++;
3392 return ifa;
3393 }
3394
3395 while (++state->bucket < IN6_ADDR_HSIZE) {
3396 state->offset = 0;
3397 hlist_for_each_entry_rcu_bh(ifa,
3398 &inet6_addr_lst[state->bucket], addr_lst) {
3399 if (!net_eq(dev_net(ifa->idev->dev), net))
3400 continue;
3401 state->offset++;
3402 return ifa;
3403 }
3404 }
3405
3406 return NULL;
3407 }
3408
3409 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3410 __acquires(rcu_bh)
3411 {
3412 rcu_read_lock_bh();
3413 return if6_get_first(seq, *pos);
3414 }
3415
3416 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3417 {
3418 struct inet6_ifaddr *ifa;
3419
3420 ifa = if6_get_next(seq, v);
3421 ++*pos;
3422 return ifa;
3423 }
3424
3425 static void if6_seq_stop(struct seq_file *seq, void *v)
3426 __releases(rcu_bh)
3427 {
3428 rcu_read_unlock_bh();
3429 }
3430
3431 static int if6_seq_show(struct seq_file *seq, void *v)
3432 {
3433 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3434 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3435 &ifp->addr,
3436 ifp->idev->dev->ifindex,
3437 ifp->prefix_len,
3438 ifp->scope,
3439 (u8) ifp->flags,
3440 ifp->idev->dev->name);
3441 return 0;
3442 }
3443
3444 static const struct seq_operations if6_seq_ops = {
3445 .start = if6_seq_start,
3446 .next = if6_seq_next,
3447 .show = if6_seq_show,
3448 .stop = if6_seq_stop,
3449 };
3450
3451 static int if6_seq_open(struct inode *inode, struct file *file)
3452 {
3453 return seq_open_net(inode, file, &if6_seq_ops,
3454 sizeof(struct if6_iter_state));
3455 }
3456
3457 static const struct file_operations if6_fops = {
3458 .owner = THIS_MODULE,
3459 .open = if6_seq_open,
3460 .read = seq_read,
3461 .llseek = seq_lseek,
3462 .release = seq_release_net,
3463 };
3464
3465 static int __net_init if6_proc_net_init(struct net *net)
3466 {
3467 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3468 return -ENOMEM;
3469 return 0;
3470 }
3471
3472 static void __net_exit if6_proc_net_exit(struct net *net)
3473 {
3474 remove_proc_entry("if_inet6", net->proc_net);
3475 }
3476
3477 static struct pernet_operations if6_proc_net_ops = {
3478 .init = if6_proc_net_init,
3479 .exit = if6_proc_net_exit,
3480 };
3481
3482 int __init if6_proc_init(void)
3483 {
3484 return register_pernet_subsys(&if6_proc_net_ops);
3485 }
3486
3487 void if6_proc_exit(void)
3488 {
3489 unregister_pernet_subsys(&if6_proc_net_ops);
3490 }
3491 #endif /* CONFIG_PROC_FS */
3492
3493 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3494 /* Check if address is a home address configured on any interface. */
3495 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3496 {
3497 int ret = 0;
3498 struct inet6_ifaddr *ifp = NULL;
3499 unsigned int hash = inet6_addr_hash(addr);
3500
3501 rcu_read_lock_bh();
3502 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3503 if (!net_eq(dev_net(ifp->idev->dev), net))
3504 continue;
3505 if (ipv6_addr_equal(&ifp->addr, addr) &&
3506 (ifp->flags & IFA_F_HOMEADDRESS)) {
3507 ret = 1;
3508 break;
3509 }
3510 }
3511 rcu_read_unlock_bh();
3512 return ret;
3513 }
3514 #endif
3515
3516 /*
3517 * Periodic address status verification
3518 */
3519
3520 static void addrconf_verify(unsigned long foo)
3521 {
3522 unsigned long now, next, next_sec, next_sched;
3523 struct inet6_ifaddr *ifp;
3524 int i;
3525
3526 rcu_read_lock_bh();
3527 spin_lock(&addrconf_verify_lock);
3528 now = jiffies;
3529 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3530
3531 del_timer(&addr_chk_timer);
3532
3533 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3534 restart:
3535 hlist_for_each_entry_rcu_bh(ifp,
3536 &inet6_addr_lst[i], addr_lst) {
3537 unsigned long age;
3538
3539 /* When setting preferred_lft to a value not zero or
3540 * infinity, while valid_lft is infinity
3541 * IFA_F_PERMANENT has a non-infinity life time.
3542 */
3543 if ((ifp->flags & IFA_F_PERMANENT) &&
3544 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3545 continue;
3546
3547 spin_lock(&ifp->lock);
3548 /* We try to batch several events at once. */
3549 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3550
3551 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3552 age >= ifp->valid_lft) {
3553 spin_unlock(&ifp->lock);
3554 in6_ifa_hold(ifp);
3555 ipv6_del_addr(ifp);
3556 goto restart;
3557 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3558 spin_unlock(&ifp->lock);
3559 continue;
3560 } else if (age >= ifp->prefered_lft) {
3561 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3562 int deprecate = 0;
3563
3564 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3565 deprecate = 1;
3566 ifp->flags |= IFA_F_DEPRECATED;
3567 }
3568
3569 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3570 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3571 next = ifp->tstamp + ifp->valid_lft * HZ;
3572
3573 spin_unlock(&ifp->lock);
3574
3575 if (deprecate) {
3576 in6_ifa_hold(ifp);
3577
3578 ipv6_ifa_notify(0, ifp);
3579 in6_ifa_put(ifp);
3580 goto restart;
3581 }
3582 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3583 !(ifp->flags&IFA_F_TENTATIVE)) {
3584 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3585 ifp->idev->cnf.dad_transmits *
3586 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3587
3588 if (age >= ifp->prefered_lft - regen_advance) {
3589 struct inet6_ifaddr *ifpub = ifp->ifpub;
3590 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3591 next = ifp->tstamp + ifp->prefered_lft * HZ;
3592 if (!ifp->regen_count && ifpub) {
3593 ifp->regen_count++;
3594 in6_ifa_hold(ifp);
3595 in6_ifa_hold(ifpub);
3596 spin_unlock(&ifp->lock);
3597
3598 spin_lock(&ifpub->lock);
3599 ifpub->regen_count = 0;
3600 spin_unlock(&ifpub->lock);
3601 ipv6_create_tempaddr(ifpub, ifp);
3602 in6_ifa_put(ifpub);
3603 in6_ifa_put(ifp);
3604 goto restart;
3605 }
3606 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3607 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3608 spin_unlock(&ifp->lock);
3609 } else {
3610 /* ifp->prefered_lft <= ifp->valid_lft */
3611 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3612 next = ifp->tstamp + ifp->prefered_lft * HZ;
3613 spin_unlock(&ifp->lock);
3614 }
3615 }
3616 }
3617
3618 next_sec = round_jiffies_up(next);
3619 next_sched = next;
3620
3621 /* If rounded timeout is accurate enough, accept it. */
3622 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3623 next_sched = next_sec;
3624
3625 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3626 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3627 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3628
3629 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3630 now, next, next_sec, next_sched);
3631
3632 addr_chk_timer.expires = next_sched;
3633 add_timer(&addr_chk_timer);
3634 spin_unlock(&addrconf_verify_lock);
3635 rcu_read_unlock_bh();
3636 }
3637
3638 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3639 struct in6_addr **peer_pfx)
3640 {
3641 struct in6_addr *pfx = NULL;
3642
3643 *peer_pfx = NULL;
3644
3645 if (addr)
3646 pfx = nla_data(addr);
3647
3648 if (local) {
3649 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3650 *peer_pfx = pfx;
3651 pfx = nla_data(local);
3652 }
3653
3654 return pfx;
3655 }
3656
3657 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3658 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3659 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3660 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3661 [IFA_FLAGS] = { .len = sizeof(u32) },
3662 };
3663
3664 static int
3665 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3666 {
3667 struct net *net = sock_net(skb->sk);
3668 struct ifaddrmsg *ifm;
3669 struct nlattr *tb[IFA_MAX+1];
3670 struct in6_addr *pfx, *peer_pfx;
3671 int err;
3672
3673 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3674 if (err < 0)
3675 return err;
3676
3677 ifm = nlmsg_data(nlh);
3678 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3679 if (pfx == NULL)
3680 return -EINVAL;
3681
3682 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3683 }
3684
3685 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
3686 u32 prefered_lft, u32 valid_lft)
3687 {
3688 u32 flags;
3689 clock_t expires;
3690 unsigned long timeout;
3691 bool was_managetempaddr;
3692 bool had_prefixroute;
3693
3694 if (!valid_lft || (prefered_lft > valid_lft))
3695 return -EINVAL;
3696
3697 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3698 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3699 return -EINVAL;
3700
3701 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3702 if (addrconf_finite_timeout(timeout)) {
3703 expires = jiffies_to_clock_t(timeout * HZ);
3704 valid_lft = timeout;
3705 flags = RTF_EXPIRES;
3706 } else {
3707 expires = 0;
3708 flags = 0;
3709 ifa_flags |= IFA_F_PERMANENT;
3710 }
3711
3712 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3713 if (addrconf_finite_timeout(timeout)) {
3714 if (timeout == 0)
3715 ifa_flags |= IFA_F_DEPRECATED;
3716 prefered_lft = timeout;
3717 }
3718
3719 spin_lock_bh(&ifp->lock);
3720 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
3721 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
3722 !(ifp->flags & IFA_F_NOPREFIXROUTE);
3723 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
3724 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3725 IFA_F_NOPREFIXROUTE);
3726 ifp->flags |= ifa_flags;
3727 ifp->tstamp = jiffies;
3728 ifp->valid_lft = valid_lft;
3729 ifp->prefered_lft = prefered_lft;
3730
3731 spin_unlock_bh(&ifp->lock);
3732 if (!(ifp->flags&IFA_F_TENTATIVE))
3733 ipv6_ifa_notify(0, ifp);
3734
3735 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
3736 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3737 expires, flags);
3738 } else if (had_prefixroute) {
3739 enum cleanup_prefix_rt_t action;
3740 unsigned long rt_expires;
3741
3742 write_lock_bh(&ifp->idev->lock);
3743 action = check_cleanup_prefix_route(ifp, &rt_expires);
3744 write_unlock_bh(&ifp->idev->lock);
3745
3746 if (action != CLEANUP_PREFIX_RT_NOP) {
3747 cleanup_prefix_route(ifp, rt_expires,
3748 action == CLEANUP_PREFIX_RT_DEL);
3749 }
3750 }
3751
3752 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3753 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3754 valid_lft = prefered_lft = 0;
3755 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3756 !was_managetempaddr, jiffies);
3757 }
3758
3759 addrconf_verify(0);
3760
3761 return 0;
3762 }
3763
3764 static int
3765 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3766 {
3767 struct net *net = sock_net(skb->sk);
3768 struct ifaddrmsg *ifm;
3769 struct nlattr *tb[IFA_MAX+1];
3770 struct in6_addr *pfx, *peer_pfx;
3771 struct inet6_ifaddr *ifa;
3772 struct net_device *dev;
3773 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3774 u32 ifa_flags;
3775 int err;
3776
3777 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3778 if (err < 0)
3779 return err;
3780
3781 ifm = nlmsg_data(nlh);
3782 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3783 if (pfx == NULL)
3784 return -EINVAL;
3785
3786 if (tb[IFA_CACHEINFO]) {
3787 struct ifa_cacheinfo *ci;
3788
3789 ci = nla_data(tb[IFA_CACHEINFO]);
3790 valid_lft = ci->ifa_valid;
3791 preferred_lft = ci->ifa_prefered;
3792 } else {
3793 preferred_lft = INFINITY_LIFE_TIME;
3794 valid_lft = INFINITY_LIFE_TIME;
3795 }
3796
3797 dev = __dev_get_by_index(net, ifm->ifa_index);
3798 if (dev == NULL)
3799 return -ENODEV;
3800
3801 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3802
3803 /* We ignore other flags so far. */
3804 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3805 IFA_F_NOPREFIXROUTE;
3806
3807 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3808 if (ifa == NULL) {
3809 /*
3810 * It would be best to check for !NLM_F_CREATE here but
3811 * userspace already relies on not having to provide this.
3812 */
3813 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3814 ifm->ifa_prefixlen, ifa_flags,
3815 preferred_lft, valid_lft);
3816 }
3817
3818 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3819 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3820 err = -EEXIST;
3821 else
3822 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3823
3824 in6_ifa_put(ifa);
3825
3826 return err;
3827 }
3828
3829 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
3830 u8 scope, int ifindex)
3831 {
3832 struct ifaddrmsg *ifm;
3833
3834 ifm = nlmsg_data(nlh);
3835 ifm->ifa_family = AF_INET6;
3836 ifm->ifa_prefixlen = prefixlen;
3837 ifm->ifa_flags = flags;
3838 ifm->ifa_scope = scope;
3839 ifm->ifa_index = ifindex;
3840 }
3841
3842 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3843 unsigned long tstamp, u32 preferred, u32 valid)
3844 {
3845 struct ifa_cacheinfo ci;
3846
3847 ci.cstamp = cstamp_delta(cstamp);
3848 ci.tstamp = cstamp_delta(tstamp);
3849 ci.ifa_prefered = preferred;
3850 ci.ifa_valid = valid;
3851
3852 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3853 }
3854
3855 static inline int rt_scope(int ifa_scope)
3856 {
3857 if (ifa_scope & IFA_HOST)
3858 return RT_SCOPE_HOST;
3859 else if (ifa_scope & IFA_LINK)
3860 return RT_SCOPE_LINK;
3861 else if (ifa_scope & IFA_SITE)
3862 return RT_SCOPE_SITE;
3863 else
3864 return RT_SCOPE_UNIVERSE;
3865 }
3866
3867 static inline int inet6_ifaddr_msgsize(void)
3868 {
3869 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3870 + nla_total_size(16) /* IFA_LOCAL */
3871 + nla_total_size(16) /* IFA_ADDRESS */
3872 + nla_total_size(sizeof(struct ifa_cacheinfo))
3873 + nla_total_size(4) /* IFA_FLAGS */;
3874 }
3875
3876 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3877 u32 portid, u32 seq, int event, unsigned int flags)
3878 {
3879 struct nlmsghdr *nlh;
3880 u32 preferred, valid;
3881
3882 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3883 if (nlh == NULL)
3884 return -EMSGSIZE;
3885
3886 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3887 ifa->idev->dev->ifindex);
3888
3889 if (!((ifa->flags&IFA_F_PERMANENT) &&
3890 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
3891 preferred = ifa->prefered_lft;
3892 valid = ifa->valid_lft;
3893 if (preferred != INFINITY_LIFE_TIME) {
3894 long tval = (jiffies - ifa->tstamp)/HZ;
3895 if (preferred > tval)
3896 preferred -= tval;
3897 else
3898 preferred = 0;
3899 if (valid != INFINITY_LIFE_TIME) {
3900 if (valid > tval)
3901 valid -= tval;
3902 else
3903 valid = 0;
3904 }
3905 }
3906 } else {
3907 preferred = INFINITY_LIFE_TIME;
3908 valid = INFINITY_LIFE_TIME;
3909 }
3910
3911 if (!ipv6_addr_any(&ifa->peer_addr)) {
3912 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3913 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3914 goto error;
3915 } else
3916 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3917 goto error;
3918
3919 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3920 goto error;
3921
3922 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
3923 goto error;
3924
3925 return nlmsg_end(skb, nlh);
3926
3927 error:
3928 nlmsg_cancel(skb, nlh);
3929 return -EMSGSIZE;
3930 }
3931
3932 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3933 u32 portid, u32 seq, int event, u16 flags)
3934 {
3935 struct nlmsghdr *nlh;
3936 u8 scope = RT_SCOPE_UNIVERSE;
3937 int ifindex = ifmca->idev->dev->ifindex;
3938
3939 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3940 scope = RT_SCOPE_SITE;
3941
3942 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3943 if (nlh == NULL)
3944 return -EMSGSIZE;
3945
3946 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3947 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3948 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3949 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3950 nlmsg_cancel(skb, nlh);
3951 return -EMSGSIZE;
3952 }
3953
3954 return nlmsg_end(skb, nlh);
3955 }
3956
3957 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3958 u32 portid, u32 seq, int event, unsigned int flags)
3959 {
3960 struct nlmsghdr *nlh;
3961 u8 scope = RT_SCOPE_UNIVERSE;
3962 int ifindex = ifaca->aca_idev->dev->ifindex;
3963
3964 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3965 scope = RT_SCOPE_SITE;
3966
3967 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3968 if (nlh == NULL)
3969 return -EMSGSIZE;
3970
3971 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3972 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3973 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3974 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3975 nlmsg_cancel(skb, nlh);
3976 return -EMSGSIZE;
3977 }
3978
3979 return nlmsg_end(skb, nlh);
3980 }
3981
3982 enum addr_type_t {
3983 UNICAST_ADDR,
3984 MULTICAST_ADDR,
3985 ANYCAST_ADDR,
3986 };
3987
3988 /* called with rcu_read_lock() */
3989 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3990 struct netlink_callback *cb, enum addr_type_t type,
3991 int s_ip_idx, int *p_ip_idx)
3992 {
3993 struct ifmcaddr6 *ifmca;
3994 struct ifacaddr6 *ifaca;
3995 int err = 1;
3996 int ip_idx = *p_ip_idx;
3997
3998 read_lock_bh(&idev->lock);
3999 switch (type) {
4000 case UNICAST_ADDR: {
4001 struct inet6_ifaddr *ifa;
4002
4003 /* unicast address incl. temp addr */
4004 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4005 if (++ip_idx < s_ip_idx)
4006 continue;
4007 err = inet6_fill_ifaddr(skb, ifa,
4008 NETLINK_CB(cb->skb).portid,
4009 cb->nlh->nlmsg_seq,
4010 RTM_NEWADDR,
4011 NLM_F_MULTI);
4012 if (err <= 0)
4013 break;
4014 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4015 }
4016 break;
4017 }
4018 case MULTICAST_ADDR:
4019 /* multicast address */
4020 for (ifmca = idev->mc_list; ifmca;
4021 ifmca = ifmca->next, ip_idx++) {
4022 if (ip_idx < s_ip_idx)
4023 continue;
4024 err = inet6_fill_ifmcaddr(skb, ifmca,
4025 NETLINK_CB(cb->skb).portid,
4026 cb->nlh->nlmsg_seq,
4027 RTM_GETMULTICAST,
4028 NLM_F_MULTI);
4029 if (err <= 0)
4030 break;
4031 }
4032 break;
4033 case ANYCAST_ADDR:
4034 /* anycast address */
4035 for (ifaca = idev->ac_list; ifaca;
4036 ifaca = ifaca->aca_next, ip_idx++) {
4037 if (ip_idx < s_ip_idx)
4038 continue;
4039 err = inet6_fill_ifacaddr(skb, ifaca,
4040 NETLINK_CB(cb->skb).portid,
4041 cb->nlh->nlmsg_seq,
4042 RTM_GETANYCAST,
4043 NLM_F_MULTI);
4044 if (err <= 0)
4045 break;
4046 }
4047 break;
4048 default:
4049 break;
4050 }
4051 read_unlock_bh(&idev->lock);
4052 *p_ip_idx = ip_idx;
4053 return err;
4054 }
4055
4056 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4057 enum addr_type_t type)
4058 {
4059 struct net *net = sock_net(skb->sk);
4060 int h, s_h;
4061 int idx, ip_idx;
4062 int s_idx, s_ip_idx;
4063 struct net_device *dev;
4064 struct inet6_dev *idev;
4065 struct hlist_head *head;
4066
4067 s_h = cb->args[0];
4068 s_idx = idx = cb->args[1];
4069 s_ip_idx = ip_idx = cb->args[2];
4070
4071 rcu_read_lock();
4072 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4073 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4074 idx = 0;
4075 head = &net->dev_index_head[h];
4076 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4077 if (idx < s_idx)
4078 goto cont;
4079 if (h > s_h || idx > s_idx)
4080 s_ip_idx = 0;
4081 ip_idx = 0;
4082 idev = __in6_dev_get(dev);
4083 if (!idev)
4084 goto cont;
4085
4086 if (in6_dump_addrs(idev, skb, cb, type,
4087 s_ip_idx, &ip_idx) <= 0)
4088 goto done;
4089 cont:
4090 idx++;
4091 }
4092 }
4093 done:
4094 rcu_read_unlock();
4095 cb->args[0] = h;
4096 cb->args[1] = idx;
4097 cb->args[2] = ip_idx;
4098
4099 return skb->len;
4100 }
4101
4102 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4103 {
4104 enum addr_type_t type = UNICAST_ADDR;
4105
4106 return inet6_dump_addr(skb, cb, type);
4107 }
4108
4109 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4110 {
4111 enum addr_type_t type = MULTICAST_ADDR;
4112
4113 return inet6_dump_addr(skb, cb, type);
4114 }
4115
4116
4117 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4118 {
4119 enum addr_type_t type = ANYCAST_ADDR;
4120
4121 return inet6_dump_addr(skb, cb, type);
4122 }
4123
4124 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4125 {
4126 struct net *net = sock_net(in_skb->sk);
4127 struct ifaddrmsg *ifm;
4128 struct nlattr *tb[IFA_MAX+1];
4129 struct in6_addr *addr = NULL, *peer;
4130 struct net_device *dev = NULL;
4131 struct inet6_ifaddr *ifa;
4132 struct sk_buff *skb;
4133 int err;
4134
4135 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4136 if (err < 0)
4137 goto errout;
4138
4139 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4140 if (addr == NULL) {
4141 err = -EINVAL;
4142 goto errout;
4143 }
4144
4145 ifm = nlmsg_data(nlh);
4146 if (ifm->ifa_index)
4147 dev = __dev_get_by_index(net, ifm->ifa_index);
4148
4149 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4150 if (!ifa) {
4151 err = -EADDRNOTAVAIL;
4152 goto errout;
4153 }
4154
4155 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4156 if (!skb) {
4157 err = -ENOBUFS;
4158 goto errout_ifa;
4159 }
4160
4161 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4162 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4163 if (err < 0) {
4164 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4165 WARN_ON(err == -EMSGSIZE);
4166 kfree_skb(skb);
4167 goto errout_ifa;
4168 }
4169 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4170 errout_ifa:
4171 in6_ifa_put(ifa);
4172 errout:
4173 return err;
4174 }
4175
4176 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4177 {
4178 struct sk_buff *skb;
4179 struct net *net = dev_net(ifa->idev->dev);
4180 int err = -ENOBUFS;
4181
4182 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4183 if (skb == NULL)
4184 goto errout;
4185
4186 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4187 if (err < 0) {
4188 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4189 WARN_ON(err == -EMSGSIZE);
4190 kfree_skb(skb);
4191 goto errout;
4192 }
4193 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4194 return;
4195 errout:
4196 if (err < 0)
4197 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4198 }
4199
4200 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4201 __s32 *array, int bytes)
4202 {
4203 BUG_ON(bytes < (DEVCONF_MAX * 4));
4204
4205 memset(array, 0, bytes);
4206 array[DEVCONF_FORWARDING] = cnf->forwarding;
4207 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4208 array[DEVCONF_MTU6] = cnf->mtu6;
4209 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4210 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4211 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4212 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4213 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4214 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4215 jiffies_to_msecs(cnf->rtr_solicit_interval);
4216 array[DEVCONF_RTR_SOLICIT_DELAY] =
4217 jiffies_to_msecs(cnf->rtr_solicit_delay);
4218 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4219 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4220 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4221 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4222 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4223 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4224 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4225 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4226 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4227 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4228 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4229 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4230 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4231 #ifdef CONFIG_IPV6_ROUTER_PREF
4232 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4233 array[DEVCONF_RTR_PROBE_INTERVAL] =
4234 jiffies_to_msecs(cnf->rtr_probe_interval);
4235 #ifdef CONFIG_IPV6_ROUTE_INFO
4236 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4237 #endif
4238 #endif
4239 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4240 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4241 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4242 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4243 #endif
4244 #ifdef CONFIG_IPV6_MROUTE
4245 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4246 #endif
4247 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4248 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4249 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4250 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4251 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4252 }
4253
4254 static inline size_t inet6_ifla6_size(void)
4255 {
4256 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4257 + nla_total_size(sizeof(struct ifla_cacheinfo))
4258 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4259 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4260 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4261 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4262 }
4263
4264 static inline size_t inet6_if_nlmsg_size(void)
4265 {
4266 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4267 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4268 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4269 + nla_total_size(4) /* IFLA_MTU */
4270 + nla_total_size(4) /* IFLA_LINK */
4271 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4272 }
4273
4274 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4275 int items, int bytes)
4276 {
4277 int i;
4278 int pad = bytes - sizeof(u64) * items;
4279 BUG_ON(pad < 0);
4280
4281 /* Use put_unaligned() because stats may not be aligned for u64. */
4282 put_unaligned(items, &stats[0]);
4283 for (i = 1; i < items; i++)
4284 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4285
4286 memset(&stats[items], 0, pad);
4287 }
4288
4289 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4290 int items, int bytes, size_t syncpoff)
4291 {
4292 int i;
4293 int pad = bytes - sizeof(u64) * items;
4294 BUG_ON(pad < 0);
4295
4296 /* Use put_unaligned() because stats may not be aligned for u64. */
4297 put_unaligned(items, &stats[0]);
4298 for (i = 1; i < items; i++)
4299 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4300
4301 memset(&stats[items], 0, pad);
4302 }
4303
4304 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4305 int bytes)
4306 {
4307 switch (attrtype) {
4308 case IFLA_INET6_STATS:
4309 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4310 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4311 break;
4312 case IFLA_INET6_ICMP6STATS:
4313 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4314 break;
4315 }
4316 }
4317
4318 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4319 {
4320 struct nlattr *nla;
4321 struct ifla_cacheinfo ci;
4322
4323 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4324 goto nla_put_failure;
4325 ci.max_reasm_len = IPV6_MAXPLEN;
4326 ci.tstamp = cstamp_delta(idev->tstamp);
4327 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4328 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4329 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4330 goto nla_put_failure;
4331 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4332 if (nla == NULL)
4333 goto nla_put_failure;
4334 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4335
4336 /* XXX - MC not implemented */
4337
4338 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4339 if (nla == NULL)
4340 goto nla_put_failure;
4341 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4342
4343 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4344 if (nla == NULL)
4345 goto nla_put_failure;
4346 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4347
4348 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4349 if (nla == NULL)
4350 goto nla_put_failure;
4351 read_lock_bh(&idev->lock);
4352 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4353 read_unlock_bh(&idev->lock);
4354
4355 return 0;
4356
4357 nla_put_failure:
4358 return -EMSGSIZE;
4359 }
4360
4361 static size_t inet6_get_link_af_size(const struct net_device *dev)
4362 {
4363 if (!__in6_dev_get(dev))
4364 return 0;
4365
4366 return inet6_ifla6_size();
4367 }
4368
4369 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4370 {
4371 struct inet6_dev *idev = __in6_dev_get(dev);
4372
4373 if (!idev)
4374 return -ENODATA;
4375
4376 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4377 return -EMSGSIZE;
4378
4379 return 0;
4380 }
4381
4382 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4383 {
4384 struct inet6_ifaddr *ifp;
4385 struct net_device *dev = idev->dev;
4386 bool update_rs = false;
4387 struct in6_addr ll_addr;
4388
4389 if (token == NULL)
4390 return -EINVAL;
4391 if (ipv6_addr_any(token))
4392 return -EINVAL;
4393 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4394 return -EINVAL;
4395 if (!ipv6_accept_ra(idev))
4396 return -EINVAL;
4397 if (idev->cnf.rtr_solicits <= 0)
4398 return -EINVAL;
4399
4400 write_lock_bh(&idev->lock);
4401
4402 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4403 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4404
4405 write_unlock_bh(&idev->lock);
4406
4407 if (!idev->dead && (idev->if_flags & IF_READY) &&
4408 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4409 IFA_F_OPTIMISTIC)) {
4410
4411 /* If we're not ready, then normal ifup will take care
4412 * of this. Otherwise, we need to request our rs here.
4413 */
4414 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4415 update_rs = true;
4416 }
4417
4418 write_lock_bh(&idev->lock);
4419
4420 if (update_rs) {
4421 idev->if_flags |= IF_RS_SENT;
4422 idev->rs_probes = 1;
4423 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4424 }
4425
4426 /* Well, that's kinda nasty ... */
4427 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4428 spin_lock(&ifp->lock);
4429 if (ifp->tokenized) {
4430 ifp->valid_lft = 0;
4431 ifp->prefered_lft = 0;
4432 }
4433 spin_unlock(&ifp->lock);
4434 }
4435
4436 write_unlock_bh(&idev->lock);
4437 addrconf_verify(0);
4438 return 0;
4439 }
4440
4441 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4442 {
4443 int err = -EINVAL;
4444 struct inet6_dev *idev = __in6_dev_get(dev);
4445 struct nlattr *tb[IFLA_INET6_MAX + 1];
4446
4447 if (!idev)
4448 return -EAFNOSUPPORT;
4449
4450 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4451 BUG();
4452
4453 if (tb[IFLA_INET6_TOKEN])
4454 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4455
4456 return err;
4457 }
4458
4459 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4460 u32 portid, u32 seq, int event, unsigned int flags)
4461 {
4462 struct net_device *dev = idev->dev;
4463 struct ifinfomsg *hdr;
4464 struct nlmsghdr *nlh;
4465 void *protoinfo;
4466
4467 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4468 if (nlh == NULL)
4469 return -EMSGSIZE;
4470
4471 hdr = nlmsg_data(nlh);
4472 hdr->ifi_family = AF_INET6;
4473 hdr->__ifi_pad = 0;
4474 hdr->ifi_type = dev->type;
4475 hdr->ifi_index = dev->ifindex;
4476 hdr->ifi_flags = dev_get_flags(dev);
4477 hdr->ifi_change = 0;
4478
4479 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4480 (dev->addr_len &&
4481 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4482 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4483 (dev->ifindex != dev->iflink &&
4484 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4485 goto nla_put_failure;
4486 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4487 if (protoinfo == NULL)
4488 goto nla_put_failure;
4489
4490 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4491 goto nla_put_failure;
4492
4493 nla_nest_end(skb, protoinfo);
4494 return nlmsg_end(skb, nlh);
4495
4496 nla_put_failure:
4497 nlmsg_cancel(skb, nlh);
4498 return -EMSGSIZE;
4499 }
4500
4501 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4502 {
4503 struct net *net = sock_net(skb->sk);
4504 int h, s_h;
4505 int idx = 0, s_idx;
4506 struct net_device *dev;
4507 struct inet6_dev *idev;
4508 struct hlist_head *head;
4509
4510 s_h = cb->args[0];
4511 s_idx = cb->args[1];
4512
4513 rcu_read_lock();
4514 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4515 idx = 0;
4516 head = &net->dev_index_head[h];
4517 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4518 if (idx < s_idx)
4519 goto cont;
4520 idev = __in6_dev_get(dev);
4521 if (!idev)
4522 goto cont;
4523 if (inet6_fill_ifinfo(skb, idev,
4524 NETLINK_CB(cb->skb).portid,
4525 cb->nlh->nlmsg_seq,
4526 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4527 goto out;
4528 cont:
4529 idx++;
4530 }
4531 }
4532 out:
4533 rcu_read_unlock();
4534 cb->args[1] = idx;
4535 cb->args[0] = h;
4536
4537 return skb->len;
4538 }
4539
4540 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4541 {
4542 struct sk_buff *skb;
4543 struct net *net = dev_net(idev->dev);
4544 int err = -ENOBUFS;
4545
4546 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4547 if (skb == NULL)
4548 goto errout;
4549
4550 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4551 if (err < 0) {
4552 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4553 WARN_ON(err == -EMSGSIZE);
4554 kfree_skb(skb);
4555 goto errout;
4556 }
4557 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4558 return;
4559 errout:
4560 if (err < 0)
4561 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4562 }
4563
4564 static inline size_t inet6_prefix_nlmsg_size(void)
4565 {
4566 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4567 + nla_total_size(sizeof(struct in6_addr))
4568 + nla_total_size(sizeof(struct prefix_cacheinfo));
4569 }
4570
4571 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4572 struct prefix_info *pinfo, u32 portid, u32 seq,
4573 int event, unsigned int flags)
4574 {
4575 struct prefixmsg *pmsg;
4576 struct nlmsghdr *nlh;
4577 struct prefix_cacheinfo ci;
4578
4579 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4580 if (nlh == NULL)
4581 return -EMSGSIZE;
4582
4583 pmsg = nlmsg_data(nlh);
4584 pmsg->prefix_family = AF_INET6;
4585 pmsg->prefix_pad1 = 0;
4586 pmsg->prefix_pad2 = 0;
4587 pmsg->prefix_ifindex = idev->dev->ifindex;
4588 pmsg->prefix_len = pinfo->prefix_len;
4589 pmsg->prefix_type = pinfo->type;
4590 pmsg->prefix_pad3 = 0;
4591 pmsg->prefix_flags = 0;
4592 if (pinfo->onlink)
4593 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4594 if (pinfo->autoconf)
4595 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4596
4597 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4598 goto nla_put_failure;
4599 ci.preferred_time = ntohl(pinfo->prefered);
4600 ci.valid_time = ntohl(pinfo->valid);
4601 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4602 goto nla_put_failure;
4603 return nlmsg_end(skb, nlh);
4604
4605 nla_put_failure:
4606 nlmsg_cancel(skb, nlh);
4607 return -EMSGSIZE;
4608 }
4609
4610 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4611 struct prefix_info *pinfo)
4612 {
4613 struct sk_buff *skb;
4614 struct net *net = dev_net(idev->dev);
4615 int err = -ENOBUFS;
4616
4617 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4618 if (skb == NULL)
4619 goto errout;
4620
4621 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4622 if (err < 0) {
4623 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4624 WARN_ON(err == -EMSGSIZE);
4625 kfree_skb(skb);
4626 goto errout;
4627 }
4628 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4629 return;
4630 errout:
4631 if (err < 0)
4632 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4633 }
4634
4635 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4636 {
4637 struct net *net = dev_net(ifp->idev->dev);
4638
4639 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4640
4641 switch (event) {
4642 case RTM_NEWADDR:
4643 /*
4644 * If the address was optimistic
4645 * we inserted the route at the start of
4646 * our DAD process, so we don't need
4647 * to do it again
4648 */
4649 if (!(ifp->rt->rt6i_node))
4650 ip6_ins_rt(ifp->rt);
4651 if (ifp->idev->cnf.forwarding)
4652 addrconf_join_anycast(ifp);
4653 if (!ipv6_addr_any(&ifp->peer_addr))
4654 addrconf_prefix_route(&ifp->peer_addr, 128,
4655 ifp->idev->dev, 0, 0);
4656 break;
4657 case RTM_DELADDR:
4658 if (ifp->idev->cnf.forwarding)
4659 addrconf_leave_anycast(ifp);
4660 addrconf_leave_solict(ifp->idev, &ifp->addr);
4661 if (!ipv6_addr_any(&ifp->peer_addr)) {
4662 struct rt6_info *rt;
4663 struct net_device *dev = ifp->idev->dev;
4664
4665 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4666 dev->ifindex, 1);
4667 if (rt) {
4668 dst_hold(&rt->dst);
4669 if (ip6_del_rt(rt))
4670 dst_free(&rt->dst);
4671 }
4672 }
4673 dst_hold(&ifp->rt->dst);
4674
4675 if (ip6_del_rt(ifp->rt))
4676 dst_free(&ifp->rt->dst);
4677 break;
4678 }
4679 atomic_inc(&net->ipv6.dev_addr_genid);
4680 rt_genid_bump_ipv6(net);
4681 }
4682
4683 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4684 {
4685 rcu_read_lock_bh();
4686 if (likely(ifp->idev->dead == 0))
4687 __ipv6_ifa_notify(event, ifp);
4688 rcu_read_unlock_bh();
4689 }
4690
4691 #ifdef CONFIG_SYSCTL
4692
4693 static
4694 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4695 void __user *buffer, size_t *lenp, loff_t *ppos)
4696 {
4697 int *valp = ctl->data;
4698 int val = *valp;
4699 loff_t pos = *ppos;
4700 struct ctl_table lctl;
4701 int ret;
4702
4703 /*
4704 * ctl->data points to idev->cnf.forwarding, we should
4705 * not modify it until we get the rtnl lock.
4706 */
4707 lctl = *ctl;
4708 lctl.data = &val;
4709
4710 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4711
4712 if (write)
4713 ret = addrconf_fixup_forwarding(ctl, valp, val);
4714 if (ret)
4715 *ppos = pos;
4716 return ret;
4717 }
4718
4719 static void dev_disable_change(struct inet6_dev *idev)
4720 {
4721 struct netdev_notifier_info info;
4722
4723 if (!idev || !idev->dev)
4724 return;
4725
4726 netdev_notifier_info_init(&info, idev->dev);
4727 if (idev->cnf.disable_ipv6)
4728 addrconf_notify(NULL, NETDEV_DOWN, &info);
4729 else
4730 addrconf_notify(NULL, NETDEV_UP, &info);
4731 }
4732
4733 static void addrconf_disable_change(struct net *net, __s32 newf)
4734 {
4735 struct net_device *dev;
4736 struct inet6_dev *idev;
4737
4738 rcu_read_lock();
4739 for_each_netdev_rcu(net, dev) {
4740 idev = __in6_dev_get(dev);
4741 if (idev) {
4742 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4743 idev->cnf.disable_ipv6 = newf;
4744 if (changed)
4745 dev_disable_change(idev);
4746 }
4747 }
4748 rcu_read_unlock();
4749 }
4750
4751 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4752 {
4753 struct net *net;
4754 int old;
4755
4756 if (!rtnl_trylock())
4757 return restart_syscall();
4758
4759 net = (struct net *)table->extra2;
4760 old = *p;
4761 *p = newf;
4762
4763 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4764 rtnl_unlock();
4765 return 0;
4766 }
4767
4768 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4769 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4770 addrconf_disable_change(net, newf);
4771 } else if ((!newf) ^ (!old))
4772 dev_disable_change((struct inet6_dev *)table->extra1);
4773
4774 rtnl_unlock();
4775 return 0;
4776 }
4777
4778 static
4779 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4780 void __user *buffer, size_t *lenp, loff_t *ppos)
4781 {
4782 int *valp = ctl->data;
4783 int val = *valp;
4784 loff_t pos = *ppos;
4785 struct ctl_table lctl;
4786 int ret;
4787
4788 /*
4789 * ctl->data points to idev->cnf.disable_ipv6, we should
4790 * not modify it until we get the rtnl lock.
4791 */
4792 lctl = *ctl;
4793 lctl.data = &val;
4794
4795 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4796
4797 if (write)
4798 ret = addrconf_disable_ipv6(ctl, valp, val);
4799 if (ret)
4800 *ppos = pos;
4801 return ret;
4802 }
4803
4804 static
4805 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
4806 void __user *buffer, size_t *lenp, loff_t *ppos)
4807 {
4808 int *valp = ctl->data;
4809 int ret;
4810 int old, new;
4811
4812 old = *valp;
4813 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4814 new = *valp;
4815
4816 if (write && old != new) {
4817 struct net *net = ctl->extra2;
4818
4819 if (!rtnl_trylock())
4820 return restart_syscall();
4821
4822 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
4823 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4824 NETCONFA_IFINDEX_DEFAULT,
4825 net->ipv6.devconf_dflt);
4826 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
4827 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4828 NETCONFA_IFINDEX_ALL,
4829 net->ipv6.devconf_all);
4830 else {
4831 struct inet6_dev *idev = ctl->extra1;
4832
4833 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4834 idev->dev->ifindex,
4835 &idev->cnf);
4836 }
4837 rtnl_unlock();
4838 }
4839
4840 return ret;
4841 }
4842
4843
4844 static struct addrconf_sysctl_table
4845 {
4846 struct ctl_table_header *sysctl_header;
4847 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4848 } addrconf_sysctl __read_mostly = {
4849 .sysctl_header = NULL,
4850 .addrconf_vars = {
4851 {
4852 .procname = "forwarding",
4853 .data = &ipv6_devconf.forwarding,
4854 .maxlen = sizeof(int),
4855 .mode = 0644,
4856 .proc_handler = addrconf_sysctl_forward,
4857 },
4858 {
4859 .procname = "hop_limit",
4860 .data = &ipv6_devconf.hop_limit,
4861 .maxlen = sizeof(int),
4862 .mode = 0644,
4863 .proc_handler = proc_dointvec,
4864 },
4865 {
4866 .procname = "mtu",
4867 .data = &ipv6_devconf.mtu6,
4868 .maxlen = sizeof(int),
4869 .mode = 0644,
4870 .proc_handler = proc_dointvec,
4871 },
4872 {
4873 .procname = "accept_ra",
4874 .data = &ipv6_devconf.accept_ra,
4875 .maxlen = sizeof(int),
4876 .mode = 0644,
4877 .proc_handler = proc_dointvec,
4878 },
4879 {
4880 .procname = "accept_redirects",
4881 .data = &ipv6_devconf.accept_redirects,
4882 .maxlen = sizeof(int),
4883 .mode = 0644,
4884 .proc_handler = proc_dointvec,
4885 },
4886 {
4887 .procname = "autoconf",
4888 .data = &ipv6_devconf.autoconf,
4889 .maxlen = sizeof(int),
4890 .mode = 0644,
4891 .proc_handler = proc_dointvec,
4892 },
4893 {
4894 .procname = "dad_transmits",
4895 .data = &ipv6_devconf.dad_transmits,
4896 .maxlen = sizeof(int),
4897 .mode = 0644,
4898 .proc_handler = proc_dointvec,
4899 },
4900 {
4901 .procname = "router_solicitations",
4902 .data = &ipv6_devconf.rtr_solicits,
4903 .maxlen = sizeof(int),
4904 .mode = 0644,
4905 .proc_handler = proc_dointvec,
4906 },
4907 {
4908 .procname = "router_solicitation_interval",
4909 .data = &ipv6_devconf.rtr_solicit_interval,
4910 .maxlen = sizeof(int),
4911 .mode = 0644,
4912 .proc_handler = proc_dointvec_jiffies,
4913 },
4914 {
4915 .procname = "router_solicitation_delay",
4916 .data = &ipv6_devconf.rtr_solicit_delay,
4917 .maxlen = sizeof(int),
4918 .mode = 0644,
4919 .proc_handler = proc_dointvec_jiffies,
4920 },
4921 {
4922 .procname = "force_mld_version",
4923 .data = &ipv6_devconf.force_mld_version,
4924 .maxlen = sizeof(int),
4925 .mode = 0644,
4926 .proc_handler = proc_dointvec,
4927 },
4928 {
4929 .procname = "mldv1_unsolicited_report_interval",
4930 .data =
4931 &ipv6_devconf.mldv1_unsolicited_report_interval,
4932 .maxlen = sizeof(int),
4933 .mode = 0644,
4934 .proc_handler = proc_dointvec_ms_jiffies,
4935 },
4936 {
4937 .procname = "mldv2_unsolicited_report_interval",
4938 .data =
4939 &ipv6_devconf.mldv2_unsolicited_report_interval,
4940 .maxlen = sizeof(int),
4941 .mode = 0644,
4942 .proc_handler = proc_dointvec_ms_jiffies,
4943 },
4944 {
4945 .procname = "use_tempaddr",
4946 .data = &ipv6_devconf.use_tempaddr,
4947 .maxlen = sizeof(int),
4948 .mode = 0644,
4949 .proc_handler = proc_dointvec,
4950 },
4951 {
4952 .procname = "temp_valid_lft",
4953 .data = &ipv6_devconf.temp_valid_lft,
4954 .maxlen = sizeof(int),
4955 .mode = 0644,
4956 .proc_handler = proc_dointvec,
4957 },
4958 {
4959 .procname = "temp_prefered_lft",
4960 .data = &ipv6_devconf.temp_prefered_lft,
4961 .maxlen = sizeof(int),
4962 .mode = 0644,
4963 .proc_handler = proc_dointvec,
4964 },
4965 {
4966 .procname = "regen_max_retry",
4967 .data = &ipv6_devconf.regen_max_retry,
4968 .maxlen = sizeof(int),
4969 .mode = 0644,
4970 .proc_handler = proc_dointvec,
4971 },
4972 {
4973 .procname = "max_desync_factor",
4974 .data = &ipv6_devconf.max_desync_factor,
4975 .maxlen = sizeof(int),
4976 .mode = 0644,
4977 .proc_handler = proc_dointvec,
4978 },
4979 {
4980 .procname = "max_addresses",
4981 .data = &ipv6_devconf.max_addresses,
4982 .maxlen = sizeof(int),
4983 .mode = 0644,
4984 .proc_handler = proc_dointvec,
4985 },
4986 {
4987 .procname = "accept_ra_defrtr",
4988 .data = &ipv6_devconf.accept_ra_defrtr,
4989 .maxlen = sizeof(int),
4990 .mode = 0644,
4991 .proc_handler = proc_dointvec,
4992 },
4993 {
4994 .procname = "accept_ra_pinfo",
4995 .data = &ipv6_devconf.accept_ra_pinfo,
4996 .maxlen = sizeof(int),
4997 .mode = 0644,
4998 .proc_handler = proc_dointvec,
4999 },
5000 #ifdef CONFIG_IPV6_ROUTER_PREF
5001 {
5002 .procname = "accept_ra_rtr_pref",
5003 .data = &ipv6_devconf.accept_ra_rtr_pref,
5004 .maxlen = sizeof(int),
5005 .mode = 0644,
5006 .proc_handler = proc_dointvec,
5007 },
5008 {
5009 .procname = "router_probe_interval",
5010 .data = &ipv6_devconf.rtr_probe_interval,
5011 .maxlen = sizeof(int),
5012 .mode = 0644,
5013 .proc_handler = proc_dointvec_jiffies,
5014 },
5015 #ifdef CONFIG_IPV6_ROUTE_INFO
5016 {
5017 .procname = "accept_ra_rt_info_max_plen",
5018 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5019 .maxlen = sizeof(int),
5020 .mode = 0644,
5021 .proc_handler = proc_dointvec,
5022 },
5023 #endif
5024 #endif
5025 {
5026 .procname = "proxy_ndp",
5027 .data = &ipv6_devconf.proxy_ndp,
5028 .maxlen = sizeof(int),
5029 .mode = 0644,
5030 .proc_handler = addrconf_sysctl_proxy_ndp,
5031 },
5032 {
5033 .procname = "accept_source_route",
5034 .data = &ipv6_devconf.accept_source_route,
5035 .maxlen = sizeof(int),
5036 .mode = 0644,
5037 .proc_handler = proc_dointvec,
5038 },
5039 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5040 {
5041 .procname = "optimistic_dad",
5042 .data = &ipv6_devconf.optimistic_dad,
5043 .maxlen = sizeof(int),
5044 .mode = 0644,
5045 .proc_handler = proc_dointvec,
5046
5047 },
5048 #endif
5049 #ifdef CONFIG_IPV6_MROUTE
5050 {
5051 .procname = "mc_forwarding",
5052 .data = &ipv6_devconf.mc_forwarding,
5053 .maxlen = sizeof(int),
5054 .mode = 0444,
5055 .proc_handler = proc_dointvec,
5056 },
5057 #endif
5058 {
5059 .procname = "disable_ipv6",
5060 .data = &ipv6_devconf.disable_ipv6,
5061 .maxlen = sizeof(int),
5062 .mode = 0644,
5063 .proc_handler = addrconf_sysctl_disable,
5064 },
5065 {
5066 .procname = "accept_dad",
5067 .data = &ipv6_devconf.accept_dad,
5068 .maxlen = sizeof(int),
5069 .mode = 0644,
5070 .proc_handler = proc_dointvec,
5071 },
5072 {
5073 .procname = "force_tllao",
5074 .data = &ipv6_devconf.force_tllao,
5075 .maxlen = sizeof(int),
5076 .mode = 0644,
5077 .proc_handler = proc_dointvec
5078 },
5079 {
5080 .procname = "ndisc_notify",
5081 .data = &ipv6_devconf.ndisc_notify,
5082 .maxlen = sizeof(int),
5083 .mode = 0644,
5084 .proc_handler = proc_dointvec
5085 },
5086 {
5087 .procname = "suppress_frag_ndisc",
5088 .data = &ipv6_devconf.suppress_frag_ndisc,
5089 .maxlen = sizeof(int),
5090 .mode = 0644,
5091 .proc_handler = proc_dointvec
5092 },
5093 {
5094 /* sentinel */
5095 }
5096 },
5097 };
5098
5099 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5100 struct inet6_dev *idev, struct ipv6_devconf *p)
5101 {
5102 int i;
5103 struct addrconf_sysctl_table *t;
5104 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5105
5106 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5107 if (t == NULL)
5108 goto out;
5109
5110 for (i = 0; t->addrconf_vars[i].data; i++) {
5111 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5112 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5113 t->addrconf_vars[i].extra2 = net;
5114 }
5115
5116 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5117
5118 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5119 if (t->sysctl_header == NULL)
5120 goto free;
5121
5122 p->sysctl = t;
5123 return 0;
5124
5125 free:
5126 kfree(t);
5127 out:
5128 return -ENOBUFS;
5129 }
5130
5131 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5132 {
5133 struct addrconf_sysctl_table *t;
5134
5135 if (p->sysctl == NULL)
5136 return;
5137
5138 t = p->sysctl;
5139 p->sysctl = NULL;
5140 unregister_net_sysctl_table(t->sysctl_header);
5141 kfree(t);
5142 }
5143
5144 static void addrconf_sysctl_register(struct inet6_dev *idev)
5145 {
5146 neigh_sysctl_register(idev->dev, idev->nd_parms,
5147 &ndisc_ifinfo_sysctl_change);
5148 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5149 idev, &idev->cnf);
5150 }
5151
5152 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5153 {
5154 __addrconf_sysctl_unregister(&idev->cnf);
5155 neigh_sysctl_unregister(idev->nd_parms);
5156 }
5157
5158
5159 #endif
5160
5161 static int __net_init addrconf_init_net(struct net *net)
5162 {
5163 int err = -ENOMEM;
5164 struct ipv6_devconf *all, *dflt;
5165
5166 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5167 if (all == NULL)
5168 goto err_alloc_all;
5169
5170 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5171 if (dflt == NULL)
5172 goto err_alloc_dflt;
5173
5174 /* these will be inherited by all namespaces */
5175 dflt->autoconf = ipv6_defaults.autoconf;
5176 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5177
5178 net->ipv6.devconf_all = all;
5179 net->ipv6.devconf_dflt = dflt;
5180
5181 #ifdef CONFIG_SYSCTL
5182 err = __addrconf_sysctl_register(net, "all", NULL, all);
5183 if (err < 0)
5184 goto err_reg_all;
5185
5186 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5187 if (err < 0)
5188 goto err_reg_dflt;
5189 #endif
5190 return 0;
5191
5192 #ifdef CONFIG_SYSCTL
5193 err_reg_dflt:
5194 __addrconf_sysctl_unregister(all);
5195 err_reg_all:
5196 kfree(dflt);
5197 #endif
5198 err_alloc_dflt:
5199 kfree(all);
5200 err_alloc_all:
5201 return err;
5202 }
5203
5204 static void __net_exit addrconf_exit_net(struct net *net)
5205 {
5206 #ifdef CONFIG_SYSCTL
5207 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5208 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5209 #endif
5210 if (!net_eq(net, &init_net)) {
5211 kfree(net->ipv6.devconf_dflt);
5212 kfree(net->ipv6.devconf_all);
5213 }
5214 }
5215
5216 static struct pernet_operations addrconf_ops = {
5217 .init = addrconf_init_net,
5218 .exit = addrconf_exit_net,
5219 };
5220
5221 static struct rtnl_af_ops inet6_ops = {
5222 .family = AF_INET6,
5223 .fill_link_af = inet6_fill_link_af,
5224 .get_link_af_size = inet6_get_link_af_size,
5225 .set_link_af = inet6_set_link_af,
5226 };
5227
5228 /*
5229 * Init / cleanup code
5230 */
5231
5232 int __init addrconf_init(void)
5233 {
5234 int i, err;
5235
5236 err = ipv6_addr_label_init();
5237 if (err < 0) {
5238 pr_crit("%s: cannot initialize default policy table: %d\n",
5239 __func__, err);
5240 goto out;
5241 }
5242
5243 err = register_pernet_subsys(&addrconf_ops);
5244 if (err < 0)
5245 goto out_addrlabel;
5246
5247 /* The addrconf netdev notifier requires that loopback_dev
5248 * has it's ipv6 private information allocated and setup
5249 * before it can bring up and give link-local addresses
5250 * to other devices which are up.
5251 *
5252 * Unfortunately, loopback_dev is not necessarily the first
5253 * entry in the global dev_base list of net devices. In fact,
5254 * it is likely to be the very last entry on that list.
5255 * So this causes the notifier registry below to try and
5256 * give link-local addresses to all devices besides loopback_dev
5257 * first, then loopback_dev, which cases all the non-loopback_dev
5258 * devices to fail to get a link-local address.
5259 *
5260 * So, as a temporary fix, allocate the ipv6 structure for
5261 * loopback_dev first by hand.
5262 * Longer term, all of the dependencies ipv6 has upon the loopback
5263 * device and it being up should be removed.
5264 */
5265 rtnl_lock();
5266 if (!ipv6_add_dev(init_net.loopback_dev))
5267 err = -ENOMEM;
5268 rtnl_unlock();
5269 if (err)
5270 goto errlo;
5271
5272 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5273 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5274
5275 register_netdevice_notifier(&ipv6_dev_notf);
5276
5277 addrconf_verify(0);
5278
5279 rtnl_af_register(&inet6_ops);
5280
5281 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5282 NULL);
5283 if (err < 0)
5284 goto errout;
5285
5286 /* Only the first call to __rtnl_register can fail */
5287 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5288 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5289 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5290 inet6_dump_ifaddr, NULL);
5291 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5292 inet6_dump_ifmcaddr, NULL);
5293 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5294 inet6_dump_ifacaddr, NULL);
5295 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5296 inet6_netconf_dump_devconf, NULL);
5297
5298 ipv6_addr_label_rtnl_register();
5299
5300 return 0;
5301 errout:
5302 rtnl_af_unregister(&inet6_ops);
5303 unregister_netdevice_notifier(&ipv6_dev_notf);
5304 errlo:
5305 unregister_pernet_subsys(&addrconf_ops);
5306 out_addrlabel:
5307 ipv6_addr_label_cleanup();
5308 out:
5309 return err;
5310 }
5311
5312 void addrconf_cleanup(void)
5313 {
5314 struct net_device *dev;
5315 int i;
5316
5317 unregister_netdevice_notifier(&ipv6_dev_notf);
5318 unregister_pernet_subsys(&addrconf_ops);
5319 ipv6_addr_label_cleanup();
5320
5321 rtnl_lock();
5322
5323 __rtnl_af_unregister(&inet6_ops);
5324
5325 /* clean dev list */
5326 for_each_netdev(&init_net, dev) {
5327 if (__in6_dev_get(dev) == NULL)
5328 continue;
5329 addrconf_ifdown(dev, 1);
5330 }
5331 addrconf_ifdown(init_net.loopback_dev, 2);
5332
5333 /*
5334 * Check hash table.
5335 */
5336 spin_lock_bh(&addrconf_hash_lock);
5337 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5338 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5339 spin_unlock_bh(&addrconf_hash_lock);
5340
5341 del_timer(&addr_chk_timer);
5342 rtnl_unlock();
5343 }
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