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