projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'iommu-fixes-v3.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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(void);
137 static void addrconf_verify_rtnl(void);
138 static void addrconf_verify_work(struct work_struct *);
139
140 static struct workqueue_struct *addrconf_wq;
141 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
142
143 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
144 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
145
146 static void addrconf_type_change(struct net_device *dev,
147 unsigned long event);
148 static int addrconf_ifdown(struct net_device *dev, int how);
149
150 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
151 int plen,
152 const struct net_device *dev,
153 u32 flags, u32 noflags);
154
155 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
156 static void addrconf_dad_work(struct work_struct *w);
157 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
158 static void addrconf_dad_run(struct inet6_dev *idev);
159 static void addrconf_rs_timer(unsigned long data);
160 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
161 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
162
163 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
164 struct prefix_info *pinfo);
165 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
166 struct net_device *dev);
167
168 static struct ipv6_devconf ipv6_devconf __read_mostly = {
169 .forwarding = 0,
170 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
171 .mtu6 = IPV6_MIN_MTU,
172 .accept_ra = 1,
173 .accept_redirects = 1,
174 .autoconf = 1,
175 .force_mld_version = 0,
176 .mldv1_unsolicited_report_interval = 10 * HZ,
177 .mldv2_unsolicited_report_interval = HZ,
178 .dad_transmits = 1,
179 .rtr_solicits = MAX_RTR_SOLICITATIONS,
180 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
181 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
182 .use_tempaddr = 0,
183 .temp_valid_lft = TEMP_VALID_LIFETIME,
184 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
185 .regen_max_retry = REGEN_MAX_RETRY,
186 .max_desync_factor = MAX_DESYNC_FACTOR,
187 .max_addresses = IPV6_MAX_ADDRESSES,
188 .accept_ra_defrtr = 1,
189 .accept_ra_pinfo = 1,
190 #ifdef CONFIG_IPV6_ROUTER_PREF
191 .accept_ra_rtr_pref = 1,
192 .rtr_probe_interval = 60 * HZ,
193 #ifdef CONFIG_IPV6_ROUTE_INFO
194 .accept_ra_rt_info_max_plen = 0,
195 #endif
196 #endif
197 .proxy_ndp = 0,
198 .accept_source_route = 0, /* we do not accept RH0 by default. */
199 .disable_ipv6 = 0,
200 .accept_dad = 1,
201 .suppress_frag_ndisc = 1,
202 };
203
204 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
205 .forwarding = 0,
206 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
207 .mtu6 = IPV6_MIN_MTU,
208 .accept_ra = 1,
209 .accept_redirects = 1,
210 .autoconf = 1,
211 .force_mld_version = 0,
212 .mldv1_unsolicited_report_interval = 10 * HZ,
213 .mldv2_unsolicited_report_interval = HZ,
214 .dad_transmits = 1,
215 .rtr_solicits = MAX_RTR_SOLICITATIONS,
216 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
217 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
218 .use_tempaddr = 0,
219 .temp_valid_lft = TEMP_VALID_LIFETIME,
220 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
221 .regen_max_retry = REGEN_MAX_RETRY,
222 .max_desync_factor = MAX_DESYNC_FACTOR,
223 .max_addresses = IPV6_MAX_ADDRESSES,
224 .accept_ra_defrtr = 1,
225 .accept_ra_pinfo = 1,
226 #ifdef CONFIG_IPV6_ROUTER_PREF
227 .accept_ra_rtr_pref = 1,
228 .rtr_probe_interval = 60 * HZ,
229 #ifdef CONFIG_IPV6_ROUTE_INFO
230 .accept_ra_rt_info_max_plen = 0,
231 #endif
232 #endif
233 .proxy_ndp = 0,
234 .accept_source_route = 0, /* we do not accept RH0 by default. */
235 .disable_ipv6 = 0,
236 .accept_dad = 1,
237 .suppress_frag_ndisc = 1,
238 };
239
240 /* Check if a valid qdisc is available */
241 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
242 {
243 return !qdisc_tx_is_noop(dev);
244 }
245
246 static void addrconf_del_rs_timer(struct inet6_dev *idev)
247 {
248 if (del_timer(&idev->rs_timer))
249 __in6_dev_put(idev);
250 }
251
252 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
253 {
254 if (cancel_delayed_work(&ifp->dad_work))
255 __in6_ifa_put(ifp);
256 }
257
258 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
259 unsigned long when)
260 {
261 if (!timer_pending(&idev->rs_timer))
262 in6_dev_hold(idev);
263 mod_timer(&idev->rs_timer, jiffies + when);
264 }
265
266 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
267 unsigned long delay)
268 {
269 if (!delayed_work_pending(&ifp->dad_work))
270 in6_ifa_hold(ifp);
271 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
272 }
273
274 static int snmp6_alloc_dev(struct inet6_dev *idev)
275 {
276 int i;
277
278 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
279 if (!idev->stats.ipv6)
280 goto err_ip;
281
282 for_each_possible_cpu(i) {
283 struct ipstats_mib *addrconf_stats;
284 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
285 u64_stats_init(&addrconf_stats->syncp);
286 }
287
288
289 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
290 GFP_KERNEL);
291 if (!idev->stats.icmpv6dev)
292 goto err_icmp;
293 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
294 GFP_KERNEL);
295 if (!idev->stats.icmpv6msgdev)
296 goto err_icmpmsg;
297
298 return 0;
299
300 err_icmpmsg:
301 kfree(idev->stats.icmpv6dev);
302 err_icmp:
303 free_percpu(idev->stats.ipv6);
304 err_ip:
305 return -ENOMEM;
306 }
307
308 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
309 {
310 struct inet6_dev *ndev;
311
312 ASSERT_RTNL();
313
314 if (dev->mtu < IPV6_MIN_MTU)
315 return NULL;
316
317 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
318
319 if (ndev == NULL)
320 return NULL;
321
322 rwlock_init(&ndev->lock);
323 ndev->dev = dev;
324 INIT_LIST_HEAD(&ndev->addr_list);
325 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
326 (unsigned long)ndev);
327 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
328 ndev->cnf.mtu6 = dev->mtu;
329 ndev->cnf.sysctl = NULL;
330 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
331 if (ndev->nd_parms == NULL) {
332 kfree(ndev);
333 return NULL;
334 }
335 if (ndev->cnf.forwarding)
336 dev_disable_lro(dev);
337 /* We refer to the device */
338 dev_hold(dev);
339
340 if (snmp6_alloc_dev(ndev) < 0) {
341 ADBG(KERN_WARNING
342 "%s: cannot allocate memory for statistics; dev=%s.\n",
343 __func__, dev->name);
344 neigh_parms_release(&nd_tbl, ndev->nd_parms);
345 dev_put(dev);
346 kfree(ndev);
347 return NULL;
348 }
349
350 if (snmp6_register_dev(ndev) < 0) {
351 ADBG(KERN_WARNING
352 "%s: cannot create /proc/net/dev_snmp6/%s\n",
353 __func__, dev->name);
354 neigh_parms_release(&nd_tbl, ndev->nd_parms);
355 ndev->dead = 1;
356 in6_dev_finish_destroy(ndev);
357 return NULL;
358 }
359
360 /* One reference from device. We must do this before
361 * we invoke __ipv6_regen_rndid().
362 */
363 in6_dev_hold(ndev);
364
365 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
366 ndev->cnf.accept_dad = -1;
367
368 #if IS_ENABLED(CONFIG_IPV6_SIT)
369 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
370 pr_info("%s: Disabled Multicast RS\n", dev->name);
371 ndev->cnf.rtr_solicits = 0;
372 }
373 #endif
374
375 INIT_LIST_HEAD(&ndev->tempaddr_list);
376 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
377 if ((dev->flags&IFF_LOOPBACK) ||
378 dev->type == ARPHRD_TUNNEL ||
379 dev->type == ARPHRD_TUNNEL6 ||
380 dev->type == ARPHRD_SIT ||
381 dev->type == ARPHRD_NONE) {
382 ndev->cnf.use_tempaddr = -1;
383 } else {
384 in6_dev_hold(ndev);
385 ipv6_regen_rndid((unsigned long) ndev);
386 }
387
388 ndev->token = in6addr_any;
389
390 if (netif_running(dev) && addrconf_qdisc_ok(dev))
391 ndev->if_flags |= IF_READY;
392
393 ipv6_mc_init_dev(ndev);
394 ndev->tstamp = jiffies;
395 addrconf_sysctl_register(ndev);
396 /* protected by rtnl_lock */
397 rcu_assign_pointer(dev->ip6_ptr, ndev);
398
399 /* Join interface-local all-node multicast group */
400 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
401
402 /* Join all-node multicast group */
403 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
404
405 /* Join all-router multicast group if forwarding is set */
406 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
407 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
408
409 return ndev;
410 }
411
412 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
413 {
414 struct inet6_dev *idev;
415
416 ASSERT_RTNL();
417
418 idev = __in6_dev_get(dev);
419 if (!idev) {
420 idev = ipv6_add_dev(dev);
421 if (!idev)
422 return NULL;
423 }
424
425 if (dev->flags&IFF_UP)
426 ipv6_mc_up(idev);
427 return idev;
428 }
429
430 static int inet6_netconf_msgsize_devconf(int type)
431 {
432 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
433 + nla_total_size(4); /* NETCONFA_IFINDEX */
434
435 /* type -1 is used for ALL */
436 if (type == -1 || type == NETCONFA_FORWARDING)
437 size += nla_total_size(4);
438 #ifdef CONFIG_IPV6_MROUTE
439 if (type == -1 || type == NETCONFA_MC_FORWARDING)
440 size += nla_total_size(4);
441 #endif
442 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
443 size += nla_total_size(4);
444
445 return size;
446 }
447
448 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
449 struct ipv6_devconf *devconf, u32 portid,
450 u32 seq, int event, unsigned int flags,
451 int type)
452 {
453 struct nlmsghdr *nlh;
454 struct netconfmsg *ncm;
455
456 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
457 flags);
458 if (nlh == NULL)
459 return -EMSGSIZE;
460
461 ncm = nlmsg_data(nlh);
462 ncm->ncm_family = AF_INET6;
463
464 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
465 goto nla_put_failure;
466
467 /* type -1 is used for ALL */
468 if ((type == -1 || type == NETCONFA_FORWARDING) &&
469 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
470 goto nla_put_failure;
471 #ifdef CONFIG_IPV6_MROUTE
472 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
473 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
474 devconf->mc_forwarding) < 0)
475 goto nla_put_failure;
476 #endif
477 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
478 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
479 goto nla_put_failure;
480
481 return nlmsg_end(skb, nlh);
482
483 nla_put_failure:
484 nlmsg_cancel(skb, nlh);
485 return -EMSGSIZE;
486 }
487
488 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
489 struct ipv6_devconf *devconf)
490 {
491 struct sk_buff *skb;
492 int err = -ENOBUFS;
493
494 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
495 if (skb == NULL)
496 goto errout;
497
498 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
499 RTM_NEWNETCONF, 0, type);
500 if (err < 0) {
501 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
502 WARN_ON(err == -EMSGSIZE);
503 kfree_skb(skb);
504 goto errout;
505 }
506 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
507 return;
508 errout:
509 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
510 }
511
512 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
513 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
514 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
515 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
516 };
517
518 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
519 struct nlmsghdr *nlh)
520 {
521 struct net *net = sock_net(in_skb->sk);
522 struct nlattr *tb[NETCONFA_MAX+1];
523 struct netconfmsg *ncm;
524 struct sk_buff *skb;
525 struct ipv6_devconf *devconf;
526 struct inet6_dev *in6_dev;
527 struct net_device *dev;
528 int ifindex;
529 int err;
530
531 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
532 devconf_ipv6_policy);
533 if (err < 0)
534 goto errout;
535
536 err = EINVAL;
537 if (!tb[NETCONFA_IFINDEX])
538 goto errout;
539
540 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
541 switch (ifindex) {
542 case NETCONFA_IFINDEX_ALL:
543 devconf = net->ipv6.devconf_all;
544 break;
545 case NETCONFA_IFINDEX_DEFAULT:
546 devconf = net->ipv6.devconf_dflt;
547 break;
548 default:
549 dev = __dev_get_by_index(net, ifindex);
550 if (dev == NULL)
551 goto errout;
552 in6_dev = __in6_dev_get(dev);
553 if (in6_dev == NULL)
554 goto errout;
555 devconf = &in6_dev->cnf;
556 break;
557 }
558
559 err = -ENOBUFS;
560 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
561 if (skb == NULL)
562 goto errout;
563
564 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
565 NETLINK_CB(in_skb).portid,
566 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
567 -1);
568 if (err < 0) {
569 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
570 WARN_ON(err == -EMSGSIZE);
571 kfree_skb(skb);
572 goto errout;
573 }
574 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
575 errout:
576 return err;
577 }
578
579 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
580 struct netlink_callback *cb)
581 {
582 struct net *net = sock_net(skb->sk);
583 int h, s_h;
584 int idx, s_idx;
585 struct net_device *dev;
586 struct inet6_dev *idev;
587 struct hlist_head *head;
588
589 s_h = cb->args[0];
590 s_idx = idx = cb->args[1];
591
592 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
593 idx = 0;
594 head = &net->dev_index_head[h];
595 rcu_read_lock();
596 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
597 net->dev_base_seq;
598 hlist_for_each_entry_rcu(dev, head, index_hlist) {
599 if (idx < s_idx)
600 goto cont;
601 idev = __in6_dev_get(dev);
602 if (!idev)
603 goto cont;
604
605 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
606 &idev->cnf,
607 NETLINK_CB(cb->skb).portid,
608 cb->nlh->nlmsg_seq,
609 RTM_NEWNETCONF,
610 NLM_F_MULTI,
611 -1) <= 0) {
612 rcu_read_unlock();
613 goto done;
614 }
615 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
616 cont:
617 idx++;
618 }
619 rcu_read_unlock();
620 }
621 if (h == NETDEV_HASHENTRIES) {
622 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
623 net->ipv6.devconf_all,
624 NETLINK_CB(cb->skb).portid,
625 cb->nlh->nlmsg_seq,
626 RTM_NEWNETCONF, NLM_F_MULTI,
627 -1) <= 0)
628 goto done;
629 else
630 h++;
631 }
632 if (h == NETDEV_HASHENTRIES + 1) {
633 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
634 net->ipv6.devconf_dflt,
635 NETLINK_CB(cb->skb).portid,
636 cb->nlh->nlmsg_seq,
637 RTM_NEWNETCONF, NLM_F_MULTI,
638 -1) <= 0)
639 goto done;
640 else
641 h++;
642 }
643 done:
644 cb->args[0] = h;
645 cb->args[1] = idx;
646
647 return skb->len;
648 }
649
650 #ifdef CONFIG_SYSCTL
651 static void dev_forward_change(struct inet6_dev *idev)
652 {
653 struct net_device *dev;
654 struct inet6_ifaddr *ifa;
655
656 if (!idev)
657 return;
658 dev = idev->dev;
659 if (idev->cnf.forwarding)
660 dev_disable_lro(dev);
661 if (dev->flags & IFF_MULTICAST) {
662 if (idev->cnf.forwarding) {
663 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
664 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
665 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
666 } else {
667 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
668 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
669 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
670 }
671 }
672
673 list_for_each_entry(ifa, &idev->addr_list, if_list) {
674 if (ifa->flags&IFA_F_TENTATIVE)
675 continue;
676 if (idev->cnf.forwarding)
677 addrconf_join_anycast(ifa);
678 else
679 addrconf_leave_anycast(ifa);
680 }
681 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
682 dev->ifindex, &idev->cnf);
683 }
684
685
686 static void addrconf_forward_change(struct net *net, __s32 newf)
687 {
688 struct net_device *dev;
689 struct inet6_dev *idev;
690
691 for_each_netdev(net, dev) {
692 idev = __in6_dev_get(dev);
693 if (idev) {
694 int changed = (!idev->cnf.forwarding) ^ (!newf);
695 idev->cnf.forwarding = newf;
696 if (changed)
697 dev_forward_change(idev);
698 }
699 }
700 }
701
702 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
703 {
704 struct net *net;
705 int old;
706
707 if (!rtnl_trylock())
708 return restart_syscall();
709
710 net = (struct net *)table->extra2;
711 old = *p;
712 *p = newf;
713
714 if (p == &net->ipv6.devconf_dflt->forwarding) {
715 if ((!newf) ^ (!old))
716 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
717 NETCONFA_IFINDEX_DEFAULT,
718 net->ipv6.devconf_dflt);
719 rtnl_unlock();
720 return 0;
721 }
722
723 if (p == &net->ipv6.devconf_all->forwarding) {
724 net->ipv6.devconf_dflt->forwarding = newf;
725 addrconf_forward_change(net, newf);
726 if ((!newf) ^ (!old))
727 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
728 NETCONFA_IFINDEX_ALL,
729 net->ipv6.devconf_all);
730 } else if ((!newf) ^ (!old))
731 dev_forward_change((struct inet6_dev *)table->extra1);
732 rtnl_unlock();
733
734 if (newf)
735 rt6_purge_dflt_routers(net);
736 return 1;
737 }
738 #endif
739
740 /* Nobody refers to this ifaddr, destroy it */
741 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
742 {
743 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
744
745 #ifdef NET_REFCNT_DEBUG
746 pr_debug("%s\n", __func__);
747 #endif
748
749 in6_dev_put(ifp->idev);
750
751 if (cancel_delayed_work(&ifp->dad_work))
752 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
753 ifp);
754
755 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
756 pr_warn("Freeing alive inet6 address %p\n", ifp);
757 return;
758 }
759 ip6_rt_put(ifp->rt);
760
761 kfree_rcu(ifp, rcu);
762 }
763
764 static void
765 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
766 {
767 struct list_head *p;
768 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
769
770 /*
771 * Each device address list is sorted in order of scope -
772 * global before linklocal.
773 */
774 list_for_each(p, &idev->addr_list) {
775 struct inet6_ifaddr *ifa
776 = list_entry(p, struct inet6_ifaddr, if_list);
777 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
778 break;
779 }
780
781 list_add_tail(&ifp->if_list, p);
782 }
783
784 static u32 inet6_addr_hash(const struct in6_addr *addr)
785 {
786 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
787 }
788
789 /* On success it returns ifp with increased reference count */
790
791 static struct inet6_ifaddr *
792 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
793 const struct in6_addr *peer_addr, int pfxlen,
794 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
795 {
796 struct inet6_ifaddr *ifa = NULL;
797 struct rt6_info *rt;
798 unsigned int hash;
799 int err = 0;
800 int addr_type = ipv6_addr_type(addr);
801
802 if (addr_type == IPV6_ADDR_ANY ||
803 addr_type & IPV6_ADDR_MULTICAST ||
804 (!(idev->dev->flags & IFF_LOOPBACK) &&
805 addr_type & IPV6_ADDR_LOOPBACK))
806 return ERR_PTR(-EADDRNOTAVAIL);
807
808 rcu_read_lock_bh();
809 if (idev->dead) {
810 err = -ENODEV; /*XXX*/
811 goto out2;
812 }
813
814 if (idev->cnf.disable_ipv6) {
815 err = -EACCES;
816 goto out2;
817 }
818
819 spin_lock(&addrconf_hash_lock);
820
821 /* Ignore adding duplicate addresses on an interface */
822 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
823 ADBG("ipv6_add_addr: already assigned\n");
824 err = -EEXIST;
825 goto out;
826 }
827
828 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
829
830 if (ifa == NULL) {
831 ADBG("ipv6_add_addr: malloc failed\n");
832 err = -ENOBUFS;
833 goto out;
834 }
835
836 rt = addrconf_dst_alloc(idev, addr, false);
837 if (IS_ERR(rt)) {
838 err = PTR_ERR(rt);
839 goto out;
840 }
841
842 neigh_parms_data_state_setall(idev->nd_parms);
843
844 ifa->addr = *addr;
845 if (peer_addr)
846 ifa->peer_addr = *peer_addr;
847
848 spin_lock_init(&ifa->lock);
849 spin_lock_init(&ifa->state_lock);
850 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
851 INIT_HLIST_NODE(&ifa->addr_lst);
852 ifa->scope = scope;
853 ifa->prefix_len = pfxlen;
854 ifa->flags = flags | IFA_F_TENTATIVE;
855 ifa->valid_lft = valid_lft;
856 ifa->prefered_lft = prefered_lft;
857 ifa->cstamp = ifa->tstamp = jiffies;
858 ifa->tokenized = false;
859
860 ifa->rt = rt;
861
862 ifa->idev = idev;
863 in6_dev_hold(idev);
864 /* For caller */
865 in6_ifa_hold(ifa);
866
867 /* Add to big hash table */
868 hash = inet6_addr_hash(addr);
869
870 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
871 spin_unlock(&addrconf_hash_lock);
872
873 write_lock(&idev->lock);
874 /* Add to inet6_dev unicast addr list. */
875 ipv6_link_dev_addr(idev, ifa);
876
877 if (ifa->flags&IFA_F_TEMPORARY) {
878 list_add(&ifa->tmp_list, &idev->tempaddr_list);
879 in6_ifa_hold(ifa);
880 }
881
882 in6_ifa_hold(ifa);
883 write_unlock(&idev->lock);
884 out2:
885 rcu_read_unlock_bh();
886
887 if (likely(err == 0))
888 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
889 else {
890 kfree(ifa);
891 ifa = ERR_PTR(err);
892 }
893
894 return ifa;
895 out:
896 spin_unlock(&addrconf_hash_lock);
897 goto out2;
898 }
899
900 enum cleanup_prefix_rt_t {
901 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
902 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
903 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
904 };
905
906 /*
907 * Check, whether the prefix for ifp would still need a prefix route
908 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
909 * constants.
910 *
911 * 1) we don't purge prefix if address was not permanent.
912 * prefix is managed by its own lifetime.
913 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
914 * 3) if there are no addresses, delete prefix.
915 * 4) if there are still other permanent address(es),
916 * corresponding prefix is still permanent.
917 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
918 * don't purge the prefix, assume user space is managing it.
919 * 6) otherwise, update prefix lifetime to the
920 * longest valid lifetime among the corresponding
921 * addresses on the device.
922 * Note: subsequent RA will update lifetime.
923 **/
924 static enum cleanup_prefix_rt_t
925 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
926 {
927 struct inet6_ifaddr *ifa;
928 struct inet6_dev *idev = ifp->idev;
929 unsigned long lifetime;
930 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
931
932 *expires = jiffies;
933
934 list_for_each_entry(ifa, &idev->addr_list, if_list) {
935 if (ifa == ifp)
936 continue;
937 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
938 ifp->prefix_len))
939 continue;
940 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
941 return CLEANUP_PREFIX_RT_NOP;
942
943 action = CLEANUP_PREFIX_RT_EXPIRE;
944
945 spin_lock(&ifa->lock);
946
947 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
948 /*
949 * Note: Because this address is
950 * not permanent, lifetime <
951 * LONG_MAX / HZ here.
952 */
953 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
954 *expires = ifa->tstamp + lifetime * HZ;
955 spin_unlock(&ifa->lock);
956 }
957
958 return action;
959 }
960
961 static void
962 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
963 {
964 struct rt6_info *rt;
965
966 rt = addrconf_get_prefix_route(&ifp->addr,
967 ifp->prefix_len,
968 ifp->idev->dev,
969 0, RTF_GATEWAY | RTF_DEFAULT);
970 if (rt) {
971 if (del_rt)
972 ip6_del_rt(rt);
973 else {
974 if (!(rt->rt6i_flags & RTF_EXPIRES))
975 rt6_set_expires(rt, expires);
976 ip6_rt_put(rt);
977 }
978 }
979 }
980
981
982 /* This function wants to get referenced ifp and releases it before return */
983
984 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
985 {
986 int state;
987 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
988 unsigned long expires;
989
990 ASSERT_RTNL();
991
992 spin_lock_bh(&ifp->state_lock);
993 state = ifp->state;
994 ifp->state = INET6_IFADDR_STATE_DEAD;
995 spin_unlock_bh(&ifp->state_lock);
996
997 if (state == INET6_IFADDR_STATE_DEAD)
998 goto out;
999
1000 spin_lock_bh(&addrconf_hash_lock);
1001 hlist_del_init_rcu(&ifp->addr_lst);
1002 spin_unlock_bh(&addrconf_hash_lock);
1003
1004 write_lock_bh(&ifp->idev->lock);
1005
1006 if (ifp->flags&IFA_F_TEMPORARY) {
1007 list_del(&ifp->tmp_list);
1008 if (ifp->ifpub) {
1009 in6_ifa_put(ifp->ifpub);
1010 ifp->ifpub = NULL;
1011 }
1012 __in6_ifa_put(ifp);
1013 }
1014
1015 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1016 action = check_cleanup_prefix_route(ifp, &expires);
1017
1018 list_del_init(&ifp->if_list);
1019 __in6_ifa_put(ifp);
1020
1021 write_unlock_bh(&ifp->idev->lock);
1022
1023 addrconf_del_dad_work(ifp);
1024
1025 ipv6_ifa_notify(RTM_DELADDR, ifp);
1026
1027 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1028
1029 if (action != CLEANUP_PREFIX_RT_NOP) {
1030 cleanup_prefix_route(ifp, expires,
1031 action == CLEANUP_PREFIX_RT_DEL);
1032 }
1033
1034 /* clean up prefsrc entries */
1035 rt6_remove_prefsrc(ifp);
1036 out:
1037 in6_ifa_put(ifp);
1038 }
1039
1040 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1041 {
1042 struct inet6_dev *idev = ifp->idev;
1043 struct in6_addr addr, *tmpaddr;
1044 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1045 unsigned long regen_advance;
1046 int tmp_plen;
1047 int ret = 0;
1048 u32 addr_flags;
1049 unsigned long now = jiffies;
1050
1051 write_lock_bh(&idev->lock);
1052 if (ift) {
1053 spin_lock_bh(&ift->lock);
1054 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1055 spin_unlock_bh(&ift->lock);
1056 tmpaddr = &addr;
1057 } else {
1058 tmpaddr = NULL;
1059 }
1060 retry:
1061 in6_dev_hold(idev);
1062 if (idev->cnf.use_tempaddr <= 0) {
1063 write_unlock_bh(&idev->lock);
1064 pr_info("%s: use_tempaddr is disabled\n", __func__);
1065 in6_dev_put(idev);
1066 ret = -1;
1067 goto out;
1068 }
1069 spin_lock_bh(&ifp->lock);
1070 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1071 idev->cnf.use_tempaddr = -1; /*XXX*/
1072 spin_unlock_bh(&ifp->lock);
1073 write_unlock_bh(&idev->lock);
1074 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1075 __func__);
1076 in6_dev_put(idev);
1077 ret = -1;
1078 goto out;
1079 }
1080 in6_ifa_hold(ifp);
1081 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1082 __ipv6_try_regen_rndid(idev, tmpaddr);
1083 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1084 age = (now - ifp->tstamp) / HZ;
1085 tmp_valid_lft = min_t(__u32,
1086 ifp->valid_lft,
1087 idev->cnf.temp_valid_lft + age);
1088 tmp_prefered_lft = min_t(__u32,
1089 ifp->prefered_lft,
1090 idev->cnf.temp_prefered_lft + age -
1091 idev->cnf.max_desync_factor);
1092 tmp_plen = ifp->prefix_len;
1093 tmp_tstamp = ifp->tstamp;
1094 spin_unlock_bh(&ifp->lock);
1095
1096 regen_advance = idev->cnf.regen_max_retry *
1097 idev->cnf.dad_transmits *
1098 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1099 write_unlock_bh(&idev->lock);
1100
1101 /* A temporary address is created only if this calculated Preferred
1102 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1103 * an implementation must not create a temporary address with a zero
1104 * Preferred Lifetime.
1105 * Use age calculation as in addrconf_verify to avoid unnecessary
1106 * temporary addresses being generated.
1107 */
1108 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1109 if (tmp_prefered_lft <= regen_advance + age) {
1110 in6_ifa_put(ifp);
1111 in6_dev_put(idev);
1112 ret = -1;
1113 goto out;
1114 }
1115
1116 addr_flags = IFA_F_TEMPORARY;
1117 /* set in addrconf_prefix_rcv() */
1118 if (ifp->flags & IFA_F_OPTIMISTIC)
1119 addr_flags |= IFA_F_OPTIMISTIC;
1120
1121 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1122 ipv6_addr_scope(&addr), addr_flags,
1123 tmp_valid_lft, tmp_prefered_lft);
1124 if (IS_ERR(ift)) {
1125 in6_ifa_put(ifp);
1126 in6_dev_put(idev);
1127 pr_info("%s: retry temporary address regeneration\n", __func__);
1128 tmpaddr = &addr;
1129 write_lock_bh(&idev->lock);
1130 goto retry;
1131 }
1132
1133 spin_lock_bh(&ift->lock);
1134 ift->ifpub = ifp;
1135 ift->cstamp = now;
1136 ift->tstamp = tmp_tstamp;
1137 spin_unlock_bh(&ift->lock);
1138
1139 addrconf_dad_start(ift);
1140 in6_ifa_put(ift);
1141 in6_dev_put(idev);
1142 out:
1143 return ret;
1144 }
1145
1146 /*
1147 * Choose an appropriate source address (RFC3484)
1148 */
1149 enum {
1150 IPV6_SADDR_RULE_INIT = 0,
1151 IPV6_SADDR_RULE_LOCAL,
1152 IPV6_SADDR_RULE_SCOPE,
1153 IPV6_SADDR_RULE_PREFERRED,
1154 #ifdef CONFIG_IPV6_MIP6
1155 IPV6_SADDR_RULE_HOA,
1156 #endif
1157 IPV6_SADDR_RULE_OIF,
1158 IPV6_SADDR_RULE_LABEL,
1159 IPV6_SADDR_RULE_PRIVACY,
1160 IPV6_SADDR_RULE_ORCHID,
1161 IPV6_SADDR_RULE_PREFIX,
1162 IPV6_SADDR_RULE_MAX
1163 };
1164
1165 struct ipv6_saddr_score {
1166 int rule;
1167 int addr_type;
1168 struct inet6_ifaddr *ifa;
1169 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1170 int scopedist;
1171 int matchlen;
1172 };
1173
1174 struct ipv6_saddr_dst {
1175 const struct in6_addr *addr;
1176 int ifindex;
1177 int scope;
1178 int label;
1179 unsigned int prefs;
1180 };
1181
1182 static inline int ipv6_saddr_preferred(int type)
1183 {
1184 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1185 return 1;
1186 return 0;
1187 }
1188
1189 static int ipv6_get_saddr_eval(struct net *net,
1190 struct ipv6_saddr_score *score,
1191 struct ipv6_saddr_dst *dst,
1192 int i)
1193 {
1194 int ret;
1195
1196 if (i <= score->rule) {
1197 switch (i) {
1198 case IPV6_SADDR_RULE_SCOPE:
1199 ret = score->scopedist;
1200 break;
1201 case IPV6_SADDR_RULE_PREFIX:
1202 ret = score->matchlen;
1203 break;
1204 default:
1205 ret = !!test_bit(i, score->scorebits);
1206 }
1207 goto out;
1208 }
1209
1210 switch (i) {
1211 case IPV6_SADDR_RULE_INIT:
1212 /* Rule 0: remember if hiscore is not ready yet */
1213 ret = !!score->ifa;
1214 break;
1215 case IPV6_SADDR_RULE_LOCAL:
1216 /* Rule 1: Prefer same address */
1217 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1218 break;
1219 case IPV6_SADDR_RULE_SCOPE:
1220 /* Rule 2: Prefer appropriate scope
1221 *
1222 * ret
1223 * ^
1224 * -1 | d 15
1225 * ---+--+-+---> scope
1226 * |
1227 * | d is scope of the destination.
1228 * B-d | \
1229 * | \ <- smaller scope is better if
1230 * B-15 | \ if scope is enough for destination.
1231 * | ret = B - scope (-1 <= scope >= d <= 15).
1232 * d-C-1 | /
1233 * |/ <- greater is better
1234 * -C / if scope is not enough for destination.
1235 * /| ret = scope - C (-1 <= d < scope <= 15).
1236 *
1237 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1238 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1239 * Assume B = 0 and we get C > 29.
1240 */
1241 ret = __ipv6_addr_src_scope(score->addr_type);
1242 if (ret >= dst->scope)
1243 ret = -ret;
1244 else
1245 ret -= 128; /* 30 is enough */
1246 score->scopedist = ret;
1247 break;
1248 case IPV6_SADDR_RULE_PREFERRED:
1249 /* Rule 3: Avoid deprecated and optimistic addresses */
1250 ret = ipv6_saddr_preferred(score->addr_type) ||
1251 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1252 break;
1253 #ifdef CONFIG_IPV6_MIP6
1254 case IPV6_SADDR_RULE_HOA:
1255 {
1256 /* Rule 4: Prefer home address */
1257 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1258 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1259 break;
1260 }
1261 #endif
1262 case IPV6_SADDR_RULE_OIF:
1263 /* Rule 5: Prefer outgoing interface */
1264 ret = (!dst->ifindex ||
1265 dst->ifindex == score->ifa->idev->dev->ifindex);
1266 break;
1267 case IPV6_SADDR_RULE_LABEL:
1268 /* Rule 6: Prefer matching label */
1269 ret = ipv6_addr_label(net,
1270 &score->ifa->addr, score->addr_type,
1271 score->ifa->idev->dev->ifindex) == dst->label;
1272 break;
1273 case IPV6_SADDR_RULE_PRIVACY:
1274 {
1275 /* Rule 7: Prefer public address
1276 * Note: prefer temporary address if use_tempaddr >= 2
1277 */
1278 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1279 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1280 score->ifa->idev->cnf.use_tempaddr >= 2;
1281 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1282 break;
1283 }
1284 case IPV6_SADDR_RULE_ORCHID:
1285 /* Rule 8-: Prefer ORCHID vs ORCHID or
1286 * non-ORCHID vs non-ORCHID
1287 */
1288 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1289 ipv6_addr_orchid(dst->addr));
1290 break;
1291 case IPV6_SADDR_RULE_PREFIX:
1292 /* Rule 8: Use longest matching prefix */
1293 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1294 if (ret > score->ifa->prefix_len)
1295 ret = score->ifa->prefix_len;
1296 score->matchlen = ret;
1297 break;
1298 default:
1299 ret = 0;
1300 }
1301
1302 if (ret)
1303 __set_bit(i, score->scorebits);
1304 score->rule = i;
1305 out:
1306 return ret;
1307 }
1308
1309 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1310 const struct in6_addr *daddr, unsigned int prefs,
1311 struct in6_addr *saddr)
1312 {
1313 struct ipv6_saddr_score scores[2],
1314 *score = &scores[0], *hiscore = &scores[1];
1315 struct ipv6_saddr_dst dst;
1316 struct net_device *dev;
1317 int dst_type;
1318
1319 dst_type = __ipv6_addr_type(daddr);
1320 dst.addr = daddr;
1321 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1322 dst.scope = __ipv6_addr_src_scope(dst_type);
1323 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1324 dst.prefs = prefs;
1325
1326 hiscore->rule = -1;
1327 hiscore->ifa = NULL;
1328
1329 rcu_read_lock();
1330
1331 for_each_netdev_rcu(net, dev) {
1332 struct inet6_dev *idev;
1333
1334 /* Candidate Source Address (section 4)
1335 * - multicast and link-local destination address,
1336 * the set of candidate source address MUST only
1337 * include addresses assigned to interfaces
1338 * belonging to the same link as the outgoing
1339 * interface.
1340 * (- For site-local destination addresses, the
1341 * set of candidate source addresses MUST only
1342 * include addresses assigned to interfaces
1343 * belonging to the same site as the outgoing
1344 * interface.)
1345 */
1346 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1347 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1348 dst.ifindex && dev->ifindex != dst.ifindex)
1349 continue;
1350
1351 idev = __in6_dev_get(dev);
1352 if (!idev)
1353 continue;
1354
1355 read_lock_bh(&idev->lock);
1356 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1357 int i;
1358
1359 /*
1360 * - Tentative Address (RFC2462 section 5.4)
1361 * - A tentative address is not considered
1362 * "assigned to an interface" in the traditional
1363 * sense, unless it is also flagged as optimistic.
1364 * - Candidate Source Address (section 4)
1365 * - In any case, anycast addresses, multicast
1366 * addresses, and the unspecified address MUST
1367 * NOT be included in a candidate set.
1368 */
1369 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1370 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1371 continue;
1372
1373 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1374
1375 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1376 score->addr_type & IPV6_ADDR_MULTICAST)) {
1377 LIMIT_NETDEBUG(KERN_DEBUG
1378 "ADDRCONF: unspecified / multicast address "
1379 "assigned as unicast address on %s",
1380 dev->name);
1381 continue;
1382 }
1383
1384 score->rule = -1;
1385 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1386
1387 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1388 int minihiscore, miniscore;
1389
1390 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1391 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1392
1393 if (minihiscore > miniscore) {
1394 if (i == IPV6_SADDR_RULE_SCOPE &&
1395 score->scopedist > 0) {
1396 /*
1397 * special case:
1398 * each remaining entry
1399 * has too small (not enough)
1400 * scope, because ifa entries
1401 * are sorted by their scope
1402 * values.
1403 */
1404 goto try_nextdev;
1405 }
1406 break;
1407 } else if (minihiscore < miniscore) {
1408 if (hiscore->ifa)
1409 in6_ifa_put(hiscore->ifa);
1410
1411 in6_ifa_hold(score->ifa);
1412
1413 swap(hiscore, score);
1414
1415 /* restore our iterator */
1416 score->ifa = hiscore->ifa;
1417
1418 break;
1419 }
1420 }
1421 }
1422 try_nextdev:
1423 read_unlock_bh(&idev->lock);
1424 }
1425 rcu_read_unlock();
1426
1427 if (!hiscore->ifa)
1428 return -EADDRNOTAVAIL;
1429
1430 *saddr = hiscore->ifa->addr;
1431 in6_ifa_put(hiscore->ifa);
1432 return 0;
1433 }
1434 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1435
1436 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1437 u32 banned_flags)
1438 {
1439 struct inet6_ifaddr *ifp;
1440 int err = -EADDRNOTAVAIL;
1441
1442 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1443 if (ifp->scope > IFA_LINK)
1444 break;
1445 if (ifp->scope == IFA_LINK &&
1446 !(ifp->flags & banned_flags)) {
1447 *addr = ifp->addr;
1448 err = 0;
1449 break;
1450 }
1451 }
1452 return err;
1453 }
1454
1455 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1456 u32 banned_flags)
1457 {
1458 struct inet6_dev *idev;
1459 int err = -EADDRNOTAVAIL;
1460
1461 rcu_read_lock();
1462 idev = __in6_dev_get(dev);
1463 if (idev) {
1464 read_lock_bh(&idev->lock);
1465 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1466 read_unlock_bh(&idev->lock);
1467 }
1468 rcu_read_unlock();
1469 return err;
1470 }
1471
1472 static int ipv6_count_addresses(struct inet6_dev *idev)
1473 {
1474 int cnt = 0;
1475 struct inet6_ifaddr *ifp;
1476
1477 read_lock_bh(&idev->lock);
1478 list_for_each_entry(ifp, &idev->addr_list, if_list)
1479 cnt++;
1480 read_unlock_bh(&idev->lock);
1481 return cnt;
1482 }
1483
1484 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1485 const struct net_device *dev, int strict)
1486 {
1487 struct inet6_ifaddr *ifp;
1488 unsigned int hash = inet6_addr_hash(addr);
1489
1490 rcu_read_lock_bh();
1491 hlist_for_each_entry_rcu(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 !(ifp->flags&IFA_F_TENTATIVE) &&
1496 (dev == NULL || ifp->idev->dev == dev ||
1497 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1498 rcu_read_unlock_bh();
1499 return 1;
1500 }
1501 }
1502
1503 rcu_read_unlock_bh();
1504 return 0;
1505 }
1506 EXPORT_SYMBOL(ipv6_chk_addr);
1507
1508 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1509 struct net_device *dev)
1510 {
1511 unsigned int hash = inet6_addr_hash(addr);
1512 struct inet6_ifaddr *ifp;
1513
1514 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1515 if (!net_eq(dev_net(ifp->idev->dev), net))
1516 continue;
1517 if (ipv6_addr_equal(&ifp->addr, addr)) {
1518 if (dev == NULL || ifp->idev->dev == dev)
1519 return true;
1520 }
1521 }
1522 return false;
1523 }
1524
1525 /* Compares an address/prefix_len with addresses on device @dev.
1526 * If one is found it returns true.
1527 */
1528 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1529 const unsigned int prefix_len, struct net_device *dev)
1530 {
1531 struct inet6_dev *idev;
1532 struct inet6_ifaddr *ifa;
1533 bool ret = false;
1534
1535 rcu_read_lock();
1536 idev = __in6_dev_get(dev);
1537 if (idev) {
1538 read_lock_bh(&idev->lock);
1539 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1540 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1541 if (ret)
1542 break;
1543 }
1544 read_unlock_bh(&idev->lock);
1545 }
1546 rcu_read_unlock();
1547
1548 return ret;
1549 }
1550 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1551
1552 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1553 {
1554 struct inet6_dev *idev;
1555 struct inet6_ifaddr *ifa;
1556 int onlink;
1557
1558 onlink = 0;
1559 rcu_read_lock();
1560 idev = __in6_dev_get(dev);
1561 if (idev) {
1562 read_lock_bh(&idev->lock);
1563 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1564 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1565 ifa->prefix_len);
1566 if (onlink)
1567 break;
1568 }
1569 read_unlock_bh(&idev->lock);
1570 }
1571 rcu_read_unlock();
1572 return onlink;
1573 }
1574 EXPORT_SYMBOL(ipv6_chk_prefix);
1575
1576 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1577 struct net_device *dev, int strict)
1578 {
1579 struct inet6_ifaddr *ifp, *result = NULL;
1580 unsigned int hash = inet6_addr_hash(addr);
1581
1582 rcu_read_lock_bh();
1583 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1584 if (!net_eq(dev_net(ifp->idev->dev), net))
1585 continue;
1586 if (ipv6_addr_equal(&ifp->addr, addr)) {
1587 if (dev == NULL || ifp->idev->dev == dev ||
1588 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1589 result = ifp;
1590 in6_ifa_hold(ifp);
1591 break;
1592 }
1593 }
1594 }
1595 rcu_read_unlock_bh();
1596
1597 return result;
1598 }
1599
1600 /* Gets referenced address, destroys ifaddr */
1601
1602 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1603 {
1604 if (ifp->flags&IFA_F_PERMANENT) {
1605 spin_lock_bh(&ifp->lock);
1606 addrconf_del_dad_work(ifp);
1607 ifp->flags |= IFA_F_TENTATIVE;
1608 if (dad_failed)
1609 ifp->flags |= IFA_F_DADFAILED;
1610 spin_unlock_bh(&ifp->lock);
1611 if (dad_failed)
1612 ipv6_ifa_notify(0, ifp);
1613 in6_ifa_put(ifp);
1614 } else if (ifp->flags&IFA_F_TEMPORARY) {
1615 struct inet6_ifaddr *ifpub;
1616 spin_lock_bh(&ifp->lock);
1617 ifpub = ifp->ifpub;
1618 if (ifpub) {
1619 in6_ifa_hold(ifpub);
1620 spin_unlock_bh(&ifp->lock);
1621 ipv6_create_tempaddr(ifpub, ifp);
1622 in6_ifa_put(ifpub);
1623 } else {
1624 spin_unlock_bh(&ifp->lock);
1625 }
1626 ipv6_del_addr(ifp);
1627 } else {
1628 ipv6_del_addr(ifp);
1629 }
1630 }
1631
1632 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1633 {
1634 int err = -ENOENT;
1635
1636 spin_lock_bh(&ifp->state_lock);
1637 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1638 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1639 err = 0;
1640 }
1641 spin_unlock_bh(&ifp->state_lock);
1642
1643 return err;
1644 }
1645
1646 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1647 {
1648 struct inet6_dev *idev = ifp->idev;
1649
1650 if (addrconf_dad_end(ifp)) {
1651 in6_ifa_put(ifp);
1652 return;
1653 }
1654
1655 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1656 ifp->idev->dev->name, &ifp->addr);
1657
1658 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1659 struct in6_addr addr;
1660
1661 addr.s6_addr32[0] = htonl(0xfe800000);
1662 addr.s6_addr32[1] = 0;
1663
1664 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1665 ipv6_addr_equal(&ifp->addr, &addr)) {
1666 /* DAD failed for link-local based on MAC address */
1667 idev->cnf.disable_ipv6 = 1;
1668
1669 pr_info("%s: IPv6 being disabled!\n",
1670 ifp->idev->dev->name);
1671 }
1672 }
1673
1674 spin_lock_bh(&ifp->state_lock);
1675 /* transition from _POSTDAD to _ERRDAD */
1676 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1677 spin_unlock_bh(&ifp->state_lock);
1678
1679 addrconf_mod_dad_work(ifp, 0);
1680 }
1681
1682 /* Join to solicited addr multicast group. */
1683
1684 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1685 {
1686 struct in6_addr maddr;
1687
1688 ASSERT_RTNL();
1689
1690 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1691 return;
1692
1693 addrconf_addr_solict_mult(addr, &maddr);
1694 ipv6_dev_mc_inc(dev, &maddr);
1695 }
1696
1697 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1698 {
1699 struct in6_addr maddr;
1700
1701 ASSERT_RTNL();
1702
1703 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1704 return;
1705
1706 addrconf_addr_solict_mult(addr, &maddr);
1707 __ipv6_dev_mc_dec(idev, &maddr);
1708 }
1709
1710 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1711 {
1712 struct in6_addr addr;
1713
1714 ASSERT_RTNL();
1715
1716 if (ifp->prefix_len >= 127) /* RFC 6164 */
1717 return;
1718 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1719 if (ipv6_addr_any(&addr))
1720 return;
1721 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1722 }
1723
1724 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1725 {
1726 struct in6_addr addr;
1727
1728 ASSERT_RTNL();
1729
1730 if (ifp->prefix_len >= 127) /* RFC 6164 */
1731 return;
1732 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1733 if (ipv6_addr_any(&addr))
1734 return;
1735 __ipv6_dev_ac_dec(ifp->idev, &addr);
1736 }
1737
1738 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1739 {
1740 if (dev->addr_len != ETH_ALEN)
1741 return -1;
1742 memcpy(eui, dev->dev_addr, 3);
1743 memcpy(eui + 5, dev->dev_addr + 3, 3);
1744
1745 /*
1746 * The zSeries OSA network cards can be shared among various
1747 * OS instances, but the OSA cards have only one MAC address.
1748 * This leads to duplicate address conflicts in conjunction
1749 * with IPv6 if more than one instance uses the same card.
1750 *
1751 * The driver for these cards can deliver a unique 16-bit
1752 * identifier for each instance sharing the same card. It is
1753 * placed instead of 0xFFFE in the interface identifier. The
1754 * "u" bit of the interface identifier is not inverted in this
1755 * case. Hence the resulting interface identifier has local
1756 * scope according to RFC2373.
1757 */
1758 if (dev->dev_id) {
1759 eui[3] = (dev->dev_id >> 8) & 0xFF;
1760 eui[4] = dev->dev_id & 0xFF;
1761 } else {
1762 eui[3] = 0xFF;
1763 eui[4] = 0xFE;
1764 eui[0] ^= 2;
1765 }
1766 return 0;
1767 }
1768
1769 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1770 {
1771 if (dev->addr_len != IEEE802154_ADDR_LEN)
1772 return -1;
1773 memcpy(eui, dev->dev_addr, 8);
1774 eui[0] ^= 2;
1775 return 0;
1776 }
1777
1778 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1779 {
1780 union fwnet_hwaddr *ha;
1781
1782 if (dev->addr_len != FWNET_ALEN)
1783 return -1;
1784
1785 ha = (union fwnet_hwaddr *)dev->dev_addr;
1786
1787 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1788 eui[0] ^= 2;
1789 return 0;
1790 }
1791
1792 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1793 {
1794 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1795 if (dev->addr_len != ARCNET_ALEN)
1796 return -1;
1797 memset(eui, 0, 7);
1798 eui[7] = *(u8 *)dev->dev_addr;
1799 return 0;
1800 }
1801
1802 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1803 {
1804 if (dev->addr_len != INFINIBAND_ALEN)
1805 return -1;
1806 memcpy(eui, dev->dev_addr + 12, 8);
1807 eui[0] |= 2;
1808 return 0;
1809 }
1810
1811 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1812 {
1813 if (addr == 0)
1814 return -1;
1815 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1816 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1817 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1818 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1819 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1820 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1821 eui[1] = 0;
1822 eui[2] = 0x5E;
1823 eui[3] = 0xFE;
1824 memcpy(eui + 4, &addr, 4);
1825 return 0;
1826 }
1827
1828 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1829 {
1830 if (dev->priv_flags & IFF_ISATAP)
1831 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1832 return -1;
1833 }
1834
1835 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1836 {
1837 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1838 }
1839
1840 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1841 {
1842 memcpy(eui, dev->perm_addr, 3);
1843 memcpy(eui + 5, dev->perm_addr + 3, 3);
1844 eui[3] = 0xFF;
1845 eui[4] = 0xFE;
1846 eui[0] ^= 2;
1847 return 0;
1848 }
1849
1850 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1851 {
1852 switch (dev->type) {
1853 case ARPHRD_ETHER:
1854 case ARPHRD_FDDI:
1855 return addrconf_ifid_eui48(eui, dev);
1856 case ARPHRD_ARCNET:
1857 return addrconf_ifid_arcnet(eui, dev);
1858 case ARPHRD_INFINIBAND:
1859 return addrconf_ifid_infiniband(eui, dev);
1860 case ARPHRD_SIT:
1861 return addrconf_ifid_sit(eui, dev);
1862 case ARPHRD_IPGRE:
1863 return addrconf_ifid_gre(eui, dev);
1864 case ARPHRD_6LOWPAN:
1865 case ARPHRD_IEEE802154:
1866 return addrconf_ifid_eui64(eui, dev);
1867 case ARPHRD_IEEE1394:
1868 return addrconf_ifid_ieee1394(eui, dev);
1869 case ARPHRD_TUNNEL6:
1870 return addrconf_ifid_ip6tnl(eui, dev);
1871 }
1872 return -1;
1873 }
1874
1875 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1876 {
1877 int err = -1;
1878 struct inet6_ifaddr *ifp;
1879
1880 read_lock_bh(&idev->lock);
1881 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1882 if (ifp->scope > IFA_LINK)
1883 break;
1884 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1885 memcpy(eui, ifp->addr.s6_addr+8, 8);
1886 err = 0;
1887 break;
1888 }
1889 }
1890 read_unlock_bh(&idev->lock);
1891 return err;
1892 }
1893
1894 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1895 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1896 {
1897 regen:
1898 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1899 idev->rndid[0] &= ~0x02;
1900
1901 /*
1902 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1903 * check if generated address is not inappropriate
1904 *
1905 * - Reserved subnet anycast (RFC 2526)
1906 * 11111101 11....11 1xxxxxxx
1907 * - ISATAP (RFC4214) 6.1
1908 * 00-00-5E-FE-xx-xx-xx-xx
1909 * - value 0
1910 * - XXX: already assigned to an address on the device
1911 */
1912 if (idev->rndid[0] == 0xfd &&
1913 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1914 (idev->rndid[7]&0x80))
1915 goto regen;
1916 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1917 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1918 goto regen;
1919 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1920 goto regen;
1921 }
1922 }
1923
1924 static void ipv6_regen_rndid(unsigned long data)
1925 {
1926 struct inet6_dev *idev = (struct inet6_dev *) data;
1927 unsigned long expires;
1928
1929 rcu_read_lock_bh();
1930 write_lock_bh(&idev->lock);
1931
1932 if (idev->dead)
1933 goto out;
1934
1935 __ipv6_regen_rndid(idev);
1936
1937 expires = jiffies +
1938 idev->cnf.temp_prefered_lft * HZ -
1939 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1940 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
1941 idev->cnf.max_desync_factor * HZ;
1942 if (time_before(expires, jiffies)) {
1943 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1944 __func__, idev->dev->name);
1945 goto out;
1946 }
1947
1948 if (!mod_timer(&idev->regen_timer, expires))
1949 in6_dev_hold(idev);
1950
1951 out:
1952 write_unlock_bh(&idev->lock);
1953 rcu_read_unlock_bh();
1954 in6_dev_put(idev);
1955 }
1956
1957 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1958 {
1959 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1960 __ipv6_regen_rndid(idev);
1961 }
1962
1963 /*
1964 * Add prefix route.
1965 */
1966
1967 static void
1968 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1969 unsigned long expires, u32 flags)
1970 {
1971 struct fib6_config cfg = {
1972 .fc_table = RT6_TABLE_PREFIX,
1973 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1974 .fc_ifindex = dev->ifindex,
1975 .fc_expires = expires,
1976 .fc_dst_len = plen,
1977 .fc_flags = RTF_UP | flags,
1978 .fc_nlinfo.nl_net = dev_net(dev),
1979 .fc_protocol = RTPROT_KERNEL,
1980 };
1981
1982 cfg.fc_dst = *pfx;
1983
1984 /* Prevent useless cloning on PtP SIT.
1985 This thing is done here expecting that the whole
1986 class of non-broadcast devices need not cloning.
1987 */
1988 #if IS_ENABLED(CONFIG_IPV6_SIT)
1989 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1990 cfg.fc_flags |= RTF_NONEXTHOP;
1991 #endif
1992
1993 ip6_route_add(&cfg);
1994 }
1995
1996
1997 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1998 int plen,
1999 const struct net_device *dev,
2000 u32 flags, u32 noflags)
2001 {
2002 struct fib6_node *fn;
2003 struct rt6_info *rt = NULL;
2004 struct fib6_table *table;
2005
2006 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2007 if (table == NULL)
2008 return NULL;
2009
2010 read_lock_bh(&table->tb6_lock);
2011 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2012 if (!fn)
2013 goto out;
2014 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2015 if (rt->dst.dev->ifindex != dev->ifindex)
2016 continue;
2017 if ((rt->rt6i_flags & flags) != flags)
2018 continue;
2019 if ((rt->rt6i_flags & noflags) != 0)
2020 continue;
2021 dst_hold(&rt->dst);
2022 break;
2023 }
2024 out:
2025 read_unlock_bh(&table->tb6_lock);
2026 return rt;
2027 }
2028
2029
2030 /* Create "default" multicast route to the interface */
2031
2032 static void addrconf_add_mroute(struct net_device *dev)
2033 {
2034 struct fib6_config cfg = {
2035 .fc_table = RT6_TABLE_LOCAL,
2036 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2037 .fc_ifindex = dev->ifindex,
2038 .fc_dst_len = 8,
2039 .fc_flags = RTF_UP,
2040 .fc_nlinfo.nl_net = dev_net(dev),
2041 };
2042
2043 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2044
2045 ip6_route_add(&cfg);
2046 }
2047
2048 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2049 {
2050 struct inet6_dev *idev;
2051
2052 ASSERT_RTNL();
2053
2054 idev = ipv6_find_idev(dev);
2055 if (!idev)
2056 return ERR_PTR(-ENOBUFS);
2057
2058 if (idev->cnf.disable_ipv6)
2059 return ERR_PTR(-EACCES);
2060
2061 /* Add default multicast route */
2062 if (!(dev->flags & IFF_LOOPBACK))
2063 addrconf_add_mroute(dev);
2064
2065 return idev;
2066 }
2067
2068 static void manage_tempaddrs(struct inet6_dev *idev,
2069 struct inet6_ifaddr *ifp,
2070 __u32 valid_lft, __u32 prefered_lft,
2071 bool create, unsigned long now)
2072 {
2073 u32 flags;
2074 struct inet6_ifaddr *ift;
2075
2076 read_lock_bh(&idev->lock);
2077 /* update all temporary addresses in the list */
2078 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2079 int age, max_valid, max_prefered;
2080
2081 if (ifp != ift->ifpub)
2082 continue;
2083
2084 /* RFC 4941 section 3.3:
2085 * If a received option will extend the lifetime of a public
2086 * address, the lifetimes of temporary addresses should
2087 * be extended, subject to the overall constraint that no
2088 * temporary addresses should ever remain "valid" or "preferred"
2089 * for a time longer than (TEMP_VALID_LIFETIME) or
2090 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2091 */
2092 age = (now - ift->cstamp) / HZ;
2093 max_valid = idev->cnf.temp_valid_lft - age;
2094 if (max_valid < 0)
2095 max_valid = 0;
2096
2097 max_prefered = idev->cnf.temp_prefered_lft -
2098 idev->cnf.max_desync_factor - age;
2099 if (max_prefered < 0)
2100 max_prefered = 0;
2101
2102 if (valid_lft > max_valid)
2103 valid_lft = max_valid;
2104
2105 if (prefered_lft > max_prefered)
2106 prefered_lft = max_prefered;
2107
2108 spin_lock(&ift->lock);
2109 flags = ift->flags;
2110 ift->valid_lft = valid_lft;
2111 ift->prefered_lft = prefered_lft;
2112 ift->tstamp = now;
2113 if (prefered_lft > 0)
2114 ift->flags &= ~IFA_F_DEPRECATED;
2115
2116 spin_unlock(&ift->lock);
2117 if (!(flags&IFA_F_TENTATIVE))
2118 ipv6_ifa_notify(0, ift);
2119 }
2120
2121 if ((create || list_empty(&idev->tempaddr_list)) &&
2122 idev->cnf.use_tempaddr > 0) {
2123 /* When a new public address is created as described
2124 * in [ADDRCONF], also create a new temporary address.
2125 * Also create a temporary address if it's enabled but
2126 * no temporary address currently exists.
2127 */
2128 read_unlock_bh(&idev->lock);
2129 ipv6_create_tempaddr(ifp, NULL);
2130 } else {
2131 read_unlock_bh(&idev->lock);
2132 }
2133 }
2134
2135 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2136 {
2137 struct prefix_info *pinfo;
2138 __u32 valid_lft;
2139 __u32 prefered_lft;
2140 int addr_type;
2141 struct inet6_dev *in6_dev;
2142 struct net *net = dev_net(dev);
2143
2144 pinfo = (struct prefix_info *) opt;
2145
2146 if (len < sizeof(struct prefix_info)) {
2147 ADBG("addrconf: prefix option too short\n");
2148 return;
2149 }
2150
2151 /*
2152 * Validation checks ([ADDRCONF], page 19)
2153 */
2154
2155 addr_type = ipv6_addr_type(&pinfo->prefix);
2156
2157 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2158 return;
2159
2160 valid_lft = ntohl(pinfo->valid);
2161 prefered_lft = ntohl(pinfo->prefered);
2162
2163 if (prefered_lft > valid_lft) {
2164 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2165 return;
2166 }
2167
2168 in6_dev = in6_dev_get(dev);
2169
2170 if (in6_dev == NULL) {
2171 net_dbg_ratelimited("addrconf: device %s not configured\n",
2172 dev->name);
2173 return;
2174 }
2175
2176 /*
2177 * Two things going on here:
2178 * 1) Add routes for on-link prefixes
2179 * 2) Configure prefixes with the auto flag set
2180 */
2181
2182 if (pinfo->onlink) {
2183 struct rt6_info *rt;
2184 unsigned long rt_expires;
2185
2186 /* Avoid arithmetic overflow. Really, we could
2187 * save rt_expires in seconds, likely valid_lft,
2188 * but it would require division in fib gc, that it
2189 * not good.
2190 */
2191 if (HZ > USER_HZ)
2192 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2193 else
2194 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2195
2196 if (addrconf_finite_timeout(rt_expires))
2197 rt_expires *= HZ;
2198
2199 rt = addrconf_get_prefix_route(&pinfo->prefix,
2200 pinfo->prefix_len,
2201 dev,
2202 RTF_ADDRCONF | RTF_PREFIX_RT,
2203 RTF_GATEWAY | RTF_DEFAULT);
2204
2205 if (rt) {
2206 /* Autoconf prefix route */
2207 if (valid_lft == 0) {
2208 ip6_del_rt(rt);
2209 rt = NULL;
2210 } else if (addrconf_finite_timeout(rt_expires)) {
2211 /* not infinity */
2212 rt6_set_expires(rt, jiffies + rt_expires);
2213 } else {
2214 rt6_clean_expires(rt);
2215 }
2216 } else if (valid_lft) {
2217 clock_t expires = 0;
2218 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2219 if (addrconf_finite_timeout(rt_expires)) {
2220 /* not infinity */
2221 flags |= RTF_EXPIRES;
2222 expires = jiffies_to_clock_t(rt_expires);
2223 }
2224 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2225 dev, expires, flags);
2226 }
2227 ip6_rt_put(rt);
2228 }
2229
2230 /* Try to figure out our local address for this prefix */
2231
2232 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2233 struct inet6_ifaddr *ifp;
2234 struct in6_addr addr;
2235 int create = 0, update_lft = 0;
2236 bool tokenized = false;
2237
2238 if (pinfo->prefix_len == 64) {
2239 memcpy(&addr, &pinfo->prefix, 8);
2240
2241 if (!ipv6_addr_any(&in6_dev->token)) {
2242 read_lock_bh(&in6_dev->lock);
2243 memcpy(addr.s6_addr + 8,
2244 in6_dev->token.s6_addr + 8, 8);
2245 read_unlock_bh(&in6_dev->lock);
2246 tokenized = true;
2247 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2248 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2249 in6_dev_put(in6_dev);
2250 return;
2251 }
2252 goto ok;
2253 }
2254 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2255 pinfo->prefix_len);
2256 in6_dev_put(in6_dev);
2257 return;
2258
2259 ok:
2260
2261 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2262
2263 if (ifp == NULL && valid_lft) {
2264 int max_addresses = in6_dev->cnf.max_addresses;
2265 u32 addr_flags = 0;
2266
2267 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2268 if (in6_dev->cnf.optimistic_dad &&
2269 !net->ipv6.devconf_all->forwarding && sllao)
2270 addr_flags = IFA_F_OPTIMISTIC;
2271 #endif
2272
2273 /* Do not allow to create too much of autoconfigured
2274 * addresses; this would be too easy way to crash kernel.
2275 */
2276 if (!max_addresses ||
2277 ipv6_count_addresses(in6_dev) < max_addresses)
2278 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2279 pinfo->prefix_len,
2280 addr_type&IPV6_ADDR_SCOPE_MASK,
2281 addr_flags, valid_lft,
2282 prefered_lft);
2283
2284 if (IS_ERR_OR_NULL(ifp)) {
2285 in6_dev_put(in6_dev);
2286 return;
2287 }
2288
2289 update_lft = 0;
2290 create = 1;
2291 spin_lock_bh(&ifp->lock);
2292 ifp->flags |= IFA_F_MANAGETEMPADDR;
2293 ifp->cstamp = jiffies;
2294 ifp->tokenized = tokenized;
2295 spin_unlock_bh(&ifp->lock);
2296 addrconf_dad_start(ifp);
2297 }
2298
2299 if (ifp) {
2300 u32 flags;
2301 unsigned long now;
2302 u32 stored_lft;
2303
2304 /* update lifetime (RFC2462 5.5.3 e) */
2305 spin_lock(&ifp->lock);
2306 now = jiffies;
2307 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2308 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2309 else
2310 stored_lft = 0;
2311 if (!update_lft && !create && stored_lft) {
2312 const u32 minimum_lft = min(
2313 stored_lft, (u32)MIN_VALID_LIFETIME);
2314 valid_lft = max(valid_lft, minimum_lft);
2315
2316 /* RFC4862 Section 5.5.3e:
2317 * "Note that the preferred lifetime of the
2318 * corresponding address is always reset to
2319 * the Preferred Lifetime in the received
2320 * Prefix Information option, regardless of
2321 * whether the valid lifetime is also reset or
2322 * ignored."
2323 *
2324 * So we should always update prefered_lft here.
2325 */
2326 update_lft = 1;
2327 }
2328
2329 if (update_lft) {
2330 ifp->valid_lft = valid_lft;
2331 ifp->prefered_lft = prefered_lft;
2332 ifp->tstamp = now;
2333 flags = ifp->flags;
2334 ifp->flags &= ~IFA_F_DEPRECATED;
2335 spin_unlock(&ifp->lock);
2336
2337 if (!(flags&IFA_F_TENTATIVE))
2338 ipv6_ifa_notify(0, ifp);
2339 } else
2340 spin_unlock(&ifp->lock);
2341
2342 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2343 create, now);
2344
2345 in6_ifa_put(ifp);
2346 addrconf_verify();
2347 }
2348 }
2349 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2350 in6_dev_put(in6_dev);
2351 }
2352
2353 /*
2354 * Set destination address.
2355 * Special case for SIT interfaces where we create a new "virtual"
2356 * device.
2357 */
2358 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2359 {
2360 struct in6_ifreq ireq;
2361 struct net_device *dev;
2362 int err = -EINVAL;
2363
2364 rtnl_lock();
2365
2366 err = -EFAULT;
2367 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2368 goto err_exit;
2369
2370 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2371
2372 err = -ENODEV;
2373 if (dev == NULL)
2374 goto err_exit;
2375
2376 #if IS_ENABLED(CONFIG_IPV6_SIT)
2377 if (dev->type == ARPHRD_SIT) {
2378 const struct net_device_ops *ops = dev->netdev_ops;
2379 struct ifreq ifr;
2380 struct ip_tunnel_parm p;
2381
2382 err = -EADDRNOTAVAIL;
2383 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2384 goto err_exit;
2385
2386 memset(&p, 0, sizeof(p));
2387 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2388 p.iph.saddr = 0;
2389 p.iph.version = 4;
2390 p.iph.ihl = 5;
2391 p.iph.protocol = IPPROTO_IPV6;
2392 p.iph.ttl = 64;
2393 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2394
2395 if (ops->ndo_do_ioctl) {
2396 mm_segment_t oldfs = get_fs();
2397
2398 set_fs(KERNEL_DS);
2399 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2400 set_fs(oldfs);
2401 } else
2402 err = -EOPNOTSUPP;
2403
2404 if (err == 0) {
2405 err = -ENOBUFS;
2406 dev = __dev_get_by_name(net, p.name);
2407 if (!dev)
2408 goto err_exit;
2409 err = dev_open(dev);
2410 }
2411 }
2412 #endif
2413
2414 err_exit:
2415 rtnl_unlock();
2416 return err;
2417 }
2418
2419 /*
2420 * Manual configuration of address on an interface
2421 */
2422 static int inet6_addr_add(struct net *net, int ifindex,
2423 const struct in6_addr *pfx,
2424 const struct in6_addr *peer_pfx,
2425 unsigned int plen, __u32 ifa_flags,
2426 __u32 prefered_lft, __u32 valid_lft)
2427 {
2428 struct inet6_ifaddr *ifp;
2429 struct inet6_dev *idev;
2430 struct net_device *dev;
2431 int scope;
2432 u32 flags;
2433 clock_t expires;
2434 unsigned long timeout;
2435
2436 ASSERT_RTNL();
2437
2438 if (plen > 128)
2439 return -EINVAL;
2440
2441 /* check the lifetime */
2442 if (!valid_lft || prefered_lft > valid_lft)
2443 return -EINVAL;
2444
2445 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2446 return -EINVAL;
2447
2448 dev = __dev_get_by_index(net, ifindex);
2449 if (!dev)
2450 return -ENODEV;
2451
2452 idev = addrconf_add_dev(dev);
2453 if (IS_ERR(idev))
2454 return PTR_ERR(idev);
2455
2456 scope = ipv6_addr_scope(pfx);
2457
2458 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2459 if (addrconf_finite_timeout(timeout)) {
2460 expires = jiffies_to_clock_t(timeout * HZ);
2461 valid_lft = timeout;
2462 flags = RTF_EXPIRES;
2463 } else {
2464 expires = 0;
2465 flags = 0;
2466 ifa_flags |= IFA_F_PERMANENT;
2467 }
2468
2469 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2470 if (addrconf_finite_timeout(timeout)) {
2471 if (timeout == 0)
2472 ifa_flags |= IFA_F_DEPRECATED;
2473 prefered_lft = timeout;
2474 }
2475
2476 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2477 valid_lft, prefered_lft);
2478
2479 if (!IS_ERR(ifp)) {
2480 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2481 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2482 expires, flags);
2483 }
2484
2485 /*
2486 * Note that section 3.1 of RFC 4429 indicates
2487 * that the Optimistic flag should not be set for
2488 * manually configured addresses
2489 */
2490 addrconf_dad_start(ifp);
2491 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2492 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2493 true, jiffies);
2494 in6_ifa_put(ifp);
2495 addrconf_verify_rtnl();
2496 return 0;
2497 }
2498
2499 return PTR_ERR(ifp);
2500 }
2501
2502 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2503 const struct in6_addr *pfx, unsigned int plen)
2504 {
2505 struct inet6_ifaddr *ifp;
2506 struct inet6_dev *idev;
2507 struct net_device *dev;
2508
2509 if (plen > 128)
2510 return -EINVAL;
2511
2512 dev = __dev_get_by_index(net, ifindex);
2513 if (!dev)
2514 return -ENODEV;
2515
2516 if ((idev = __in6_dev_get(dev)) == NULL)
2517 return -ENXIO;
2518
2519 read_lock_bh(&idev->lock);
2520 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2521 if (ifp->prefix_len == plen &&
2522 ipv6_addr_equal(pfx, &ifp->addr)) {
2523 in6_ifa_hold(ifp);
2524 read_unlock_bh(&idev->lock);
2525
2526 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2527 (ifa_flags & IFA_F_MANAGETEMPADDR))
2528 manage_tempaddrs(idev, ifp, 0, 0, false,
2529 jiffies);
2530 ipv6_del_addr(ifp);
2531 addrconf_verify_rtnl();
2532 return 0;
2533 }
2534 }
2535 read_unlock_bh(&idev->lock);
2536 return -EADDRNOTAVAIL;
2537 }
2538
2539
2540 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2541 {
2542 struct in6_ifreq ireq;
2543 int err;
2544
2545 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2546 return -EPERM;
2547
2548 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2549 return -EFAULT;
2550
2551 rtnl_lock();
2552 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2553 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2554 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2555 rtnl_unlock();
2556 return err;
2557 }
2558
2559 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2560 {
2561 struct in6_ifreq ireq;
2562 int err;
2563
2564 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2565 return -EPERM;
2566
2567 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2568 return -EFAULT;
2569
2570 rtnl_lock();
2571 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2572 ireq.ifr6_prefixlen);
2573 rtnl_unlock();
2574 return err;
2575 }
2576
2577 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2578 int plen, int scope)
2579 {
2580 struct inet6_ifaddr *ifp;
2581
2582 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2583 scope, IFA_F_PERMANENT,
2584 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2585 if (!IS_ERR(ifp)) {
2586 spin_lock_bh(&ifp->lock);
2587 ifp->flags &= ~IFA_F_TENTATIVE;
2588 spin_unlock_bh(&ifp->lock);
2589 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2590 in6_ifa_put(ifp);
2591 }
2592 }
2593
2594 #if IS_ENABLED(CONFIG_IPV6_SIT)
2595 static void sit_add_v4_addrs(struct inet6_dev *idev)
2596 {
2597 struct in6_addr addr;
2598 struct net_device *dev;
2599 struct net *net = dev_net(idev->dev);
2600 int scope, plen;
2601 u32 pflags = 0;
2602
2603 ASSERT_RTNL();
2604
2605 memset(&addr, 0, sizeof(struct in6_addr));
2606 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2607
2608 if (idev->dev->flags&IFF_POINTOPOINT) {
2609 addr.s6_addr32[0] = htonl(0xfe800000);
2610 scope = IFA_LINK;
2611 plen = 64;
2612 } else {
2613 scope = IPV6_ADDR_COMPATv4;
2614 plen = 96;
2615 pflags |= RTF_NONEXTHOP;
2616 }
2617
2618 if (addr.s6_addr32[3]) {
2619 add_addr(idev, &addr, plen, scope);
2620 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2621 return;
2622 }
2623
2624 for_each_netdev(net, dev) {
2625 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2626 if (in_dev && (dev->flags & IFF_UP)) {
2627 struct in_ifaddr *ifa;
2628
2629 int flag = scope;
2630
2631 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2632
2633 addr.s6_addr32[3] = ifa->ifa_local;
2634
2635 if (ifa->ifa_scope == RT_SCOPE_LINK)
2636 continue;
2637 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2638 if (idev->dev->flags&IFF_POINTOPOINT)
2639 continue;
2640 flag |= IFA_HOST;
2641 }
2642
2643 add_addr(idev, &addr, plen, flag);
2644 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2645 pflags);
2646 }
2647 }
2648 }
2649 }
2650 #endif
2651
2652 static void init_loopback(struct net_device *dev)
2653 {
2654 struct inet6_dev *idev;
2655 struct net_device *sp_dev;
2656 struct inet6_ifaddr *sp_ifa;
2657 struct rt6_info *sp_rt;
2658
2659 /* ::1 */
2660
2661 ASSERT_RTNL();
2662
2663 if ((idev = ipv6_find_idev(dev)) == NULL) {
2664 pr_debug("%s: add_dev failed\n", __func__);
2665 return;
2666 }
2667
2668 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2669
2670 /* Add routes to other interface's IPv6 addresses */
2671 for_each_netdev(dev_net(dev), sp_dev) {
2672 if (!strcmp(sp_dev->name, dev->name))
2673 continue;
2674
2675 idev = __in6_dev_get(sp_dev);
2676 if (!idev)
2677 continue;
2678
2679 read_lock_bh(&idev->lock);
2680 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2681
2682 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2683 continue;
2684
2685 if (sp_ifa->rt) {
2686 /* This dst has been added to garbage list when
2687 * lo device down, release this obsolete dst and
2688 * reallocate a new router for ifa.
2689 */
2690 if (sp_ifa->rt->dst.obsolete > 0) {
2691 ip6_rt_put(sp_ifa->rt);
2692 sp_ifa->rt = NULL;
2693 } else {
2694 continue;
2695 }
2696 }
2697
2698 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2699
2700 /* Failure cases are ignored */
2701 if (!IS_ERR(sp_rt)) {
2702 sp_ifa->rt = sp_rt;
2703 ip6_ins_rt(sp_rt);
2704 }
2705 }
2706 read_unlock_bh(&idev->lock);
2707 }
2708 }
2709
2710 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2711 {
2712 struct inet6_ifaddr *ifp;
2713 u32 addr_flags = IFA_F_PERMANENT;
2714
2715 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2716 if (idev->cnf.optimistic_dad &&
2717 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2718 addr_flags |= IFA_F_OPTIMISTIC;
2719 #endif
2720
2721
2722 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2723 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2724 if (!IS_ERR(ifp)) {
2725 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2726 addrconf_dad_start(ifp);
2727 in6_ifa_put(ifp);
2728 }
2729 }
2730
2731 static void addrconf_dev_config(struct net_device *dev)
2732 {
2733 struct in6_addr addr;
2734 struct inet6_dev *idev;
2735
2736 ASSERT_RTNL();
2737
2738 if ((dev->type != ARPHRD_ETHER) &&
2739 (dev->type != ARPHRD_FDDI) &&
2740 (dev->type != ARPHRD_ARCNET) &&
2741 (dev->type != ARPHRD_INFINIBAND) &&
2742 (dev->type != ARPHRD_IEEE802154) &&
2743 (dev->type != ARPHRD_IEEE1394) &&
2744 (dev->type != ARPHRD_TUNNEL6) &&
2745 (dev->type != ARPHRD_6LOWPAN)) {
2746 /* Alas, we support only Ethernet autoconfiguration. */
2747 return;
2748 }
2749
2750 idev = addrconf_add_dev(dev);
2751 if (IS_ERR(idev))
2752 return;
2753
2754 memset(&addr, 0, sizeof(struct in6_addr));
2755 addr.s6_addr32[0] = htonl(0xFE800000);
2756
2757 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2758 addrconf_add_linklocal(idev, &addr);
2759 }
2760
2761 #if IS_ENABLED(CONFIG_IPV6_SIT)
2762 static void addrconf_sit_config(struct net_device *dev)
2763 {
2764 struct inet6_dev *idev;
2765
2766 ASSERT_RTNL();
2767
2768 /*
2769 * Configure the tunnel with one of our IPv4
2770 * addresses... we should configure all of
2771 * our v4 addrs in the tunnel
2772 */
2773
2774 if ((idev = ipv6_find_idev(dev)) == NULL) {
2775 pr_debug("%s: add_dev failed\n", __func__);
2776 return;
2777 }
2778
2779 if (dev->priv_flags & IFF_ISATAP) {
2780 struct in6_addr addr;
2781
2782 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2783 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2784 addrconf_add_linklocal(idev, &addr);
2785 return;
2786 }
2787
2788 sit_add_v4_addrs(idev);
2789
2790 if (dev->flags&IFF_POINTOPOINT)
2791 addrconf_add_mroute(dev);
2792 }
2793 #endif
2794
2795 #if IS_ENABLED(CONFIG_NET_IPGRE)
2796 static void addrconf_gre_config(struct net_device *dev)
2797 {
2798 struct inet6_dev *idev;
2799 struct in6_addr addr;
2800
2801 ASSERT_RTNL();
2802
2803 if ((idev = ipv6_find_idev(dev)) == NULL) {
2804 pr_debug("%s: add_dev failed\n", __func__);
2805 return;
2806 }
2807
2808 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2809 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2810 addrconf_add_linklocal(idev, &addr);
2811 else
2812 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2813 }
2814 #endif
2815
2816 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2817 void *ptr)
2818 {
2819 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2820 struct inet6_dev *idev = __in6_dev_get(dev);
2821 int run_pending = 0;
2822 int err;
2823
2824 switch (event) {
2825 case NETDEV_REGISTER:
2826 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2827 idev = ipv6_add_dev(dev);
2828 if (!idev)
2829 return notifier_from_errno(-ENOMEM);
2830 }
2831 break;
2832
2833 case NETDEV_UP:
2834 case NETDEV_CHANGE:
2835 if (dev->flags & IFF_SLAVE)
2836 break;
2837
2838 if (event == NETDEV_UP) {
2839 if (!addrconf_qdisc_ok(dev)) {
2840 /* device is not ready yet. */
2841 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2842 dev->name);
2843 break;
2844 }
2845
2846 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2847 idev = ipv6_add_dev(dev);
2848
2849 if (idev) {
2850 idev->if_flags |= IF_READY;
2851 run_pending = 1;
2852 }
2853 } else {
2854 if (!addrconf_qdisc_ok(dev)) {
2855 /* device is still not ready. */
2856 break;
2857 }
2858
2859 if (idev) {
2860 if (idev->if_flags & IF_READY)
2861 /* device is already configured. */
2862 break;
2863 idev->if_flags |= IF_READY;
2864 }
2865
2866 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2867 dev->name);
2868
2869 run_pending = 1;
2870 }
2871
2872 switch (dev->type) {
2873 #if IS_ENABLED(CONFIG_IPV6_SIT)
2874 case ARPHRD_SIT:
2875 addrconf_sit_config(dev);
2876 break;
2877 #endif
2878 #if IS_ENABLED(CONFIG_NET_IPGRE)
2879 case ARPHRD_IPGRE:
2880 addrconf_gre_config(dev);
2881 break;
2882 #endif
2883 case ARPHRD_LOOPBACK:
2884 init_loopback(dev);
2885 break;
2886
2887 default:
2888 addrconf_dev_config(dev);
2889 break;
2890 }
2891
2892 if (idev) {
2893 if (run_pending)
2894 addrconf_dad_run(idev);
2895
2896 /*
2897 * If the MTU changed during the interface down,
2898 * when the interface up, the changed MTU must be
2899 * reflected in the idev as well as routers.
2900 */
2901 if (idev->cnf.mtu6 != dev->mtu &&
2902 dev->mtu >= IPV6_MIN_MTU) {
2903 rt6_mtu_change(dev, dev->mtu);
2904 idev->cnf.mtu6 = dev->mtu;
2905 }
2906 idev->tstamp = jiffies;
2907 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2908
2909 /*
2910 * If the changed mtu during down is lower than
2911 * IPV6_MIN_MTU stop IPv6 on this interface.
2912 */
2913 if (dev->mtu < IPV6_MIN_MTU)
2914 addrconf_ifdown(dev, 1);
2915 }
2916 break;
2917
2918 case NETDEV_CHANGEMTU:
2919 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2920 rt6_mtu_change(dev, dev->mtu);
2921 idev->cnf.mtu6 = dev->mtu;
2922 break;
2923 }
2924
2925 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2926 idev = ipv6_add_dev(dev);
2927 if (idev)
2928 break;
2929 }
2930
2931 /*
2932 * if MTU under IPV6_MIN_MTU.
2933 * Stop IPv6 on this interface.
2934 */
2935
2936 case NETDEV_DOWN:
2937 case NETDEV_UNREGISTER:
2938 /*
2939 * Remove all addresses from this interface.
2940 */
2941 addrconf_ifdown(dev, event != NETDEV_DOWN);
2942 break;
2943
2944 case NETDEV_CHANGENAME:
2945 if (idev) {
2946 snmp6_unregister_dev(idev);
2947 addrconf_sysctl_unregister(idev);
2948 addrconf_sysctl_register(idev);
2949 err = snmp6_register_dev(idev);
2950 if (err)
2951 return notifier_from_errno(err);
2952 }
2953 break;
2954
2955 case NETDEV_PRE_TYPE_CHANGE:
2956 case NETDEV_POST_TYPE_CHANGE:
2957 addrconf_type_change(dev, event);
2958 break;
2959 }
2960
2961 return NOTIFY_OK;
2962 }
2963
2964 /*
2965 * addrconf module should be notified of a device going up
2966 */
2967 static struct notifier_block ipv6_dev_notf = {
2968 .notifier_call = addrconf_notify,
2969 };
2970
2971 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2972 {
2973 struct inet6_dev *idev;
2974 ASSERT_RTNL();
2975
2976 idev = __in6_dev_get(dev);
2977
2978 if (event == NETDEV_POST_TYPE_CHANGE)
2979 ipv6_mc_remap(idev);
2980 else if (event == NETDEV_PRE_TYPE_CHANGE)
2981 ipv6_mc_unmap(idev);
2982 }
2983
2984 static int addrconf_ifdown(struct net_device *dev, int how)
2985 {
2986 struct net *net = dev_net(dev);
2987 struct inet6_dev *idev;
2988 struct inet6_ifaddr *ifa;
2989 int state, i;
2990
2991 ASSERT_RTNL();
2992
2993 rt6_ifdown(net, dev);
2994 neigh_ifdown(&nd_tbl, dev);
2995
2996 idev = __in6_dev_get(dev);
2997 if (idev == NULL)
2998 return -ENODEV;
2999
3000 /*
3001 * Step 1: remove reference to ipv6 device from parent device.
3002 * Do not dev_put!
3003 */
3004 if (how) {
3005 idev->dead = 1;
3006
3007 /* protected by rtnl_lock */
3008 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3009
3010 /* Step 1.5: remove snmp6 entry */
3011 snmp6_unregister_dev(idev);
3012
3013 }
3014
3015 /* Step 2: clear hash table */
3016 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3017 struct hlist_head *h = &inet6_addr_lst[i];
3018
3019 spin_lock_bh(&addrconf_hash_lock);
3020 restart:
3021 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3022 if (ifa->idev == idev) {
3023 hlist_del_init_rcu(&ifa->addr_lst);
3024 addrconf_del_dad_work(ifa);
3025 goto restart;
3026 }
3027 }
3028 spin_unlock_bh(&addrconf_hash_lock);
3029 }
3030
3031 write_lock_bh(&idev->lock);
3032
3033 addrconf_del_rs_timer(idev);
3034
3035 /* Step 2: clear flags for stateless addrconf */
3036 if (!how)
3037 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3038
3039 if (how && del_timer(&idev->regen_timer))
3040 in6_dev_put(idev);
3041
3042 /* Step 3: clear tempaddr list */
3043 while (!list_empty(&idev->tempaddr_list)) {
3044 ifa = list_first_entry(&idev->tempaddr_list,
3045 struct inet6_ifaddr, tmp_list);
3046 list_del(&ifa->tmp_list);
3047 write_unlock_bh(&idev->lock);
3048 spin_lock_bh(&ifa->lock);
3049
3050 if (ifa->ifpub) {
3051 in6_ifa_put(ifa->ifpub);
3052 ifa->ifpub = NULL;
3053 }
3054 spin_unlock_bh(&ifa->lock);
3055 in6_ifa_put(ifa);
3056 write_lock_bh(&idev->lock);
3057 }
3058
3059 while (!list_empty(&idev->addr_list)) {
3060 ifa = list_first_entry(&idev->addr_list,
3061 struct inet6_ifaddr, if_list);
3062 addrconf_del_dad_work(ifa);
3063
3064 list_del(&ifa->if_list);
3065
3066 write_unlock_bh(&idev->lock);
3067
3068 spin_lock_bh(&ifa->state_lock);
3069 state = ifa->state;
3070 ifa->state = INET6_IFADDR_STATE_DEAD;
3071 spin_unlock_bh(&ifa->state_lock);
3072
3073 if (state != INET6_IFADDR_STATE_DEAD) {
3074 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3075 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3076 }
3077 in6_ifa_put(ifa);
3078
3079 write_lock_bh(&idev->lock);
3080 }
3081
3082 write_unlock_bh(&idev->lock);
3083
3084 /* Step 5: Discard multicast list */
3085 if (how)
3086 ipv6_mc_destroy_dev(idev);
3087 else
3088 ipv6_mc_down(idev);
3089
3090 idev->tstamp = jiffies;
3091
3092 /* Last: Shot the device (if unregistered) */
3093 if (how) {
3094 addrconf_sysctl_unregister(idev);
3095 neigh_parms_release(&nd_tbl, idev->nd_parms);
3096 neigh_ifdown(&nd_tbl, dev);
3097 in6_dev_put(idev);
3098 }
3099 return 0;
3100 }
3101
3102 static void addrconf_rs_timer(unsigned long data)
3103 {
3104 struct inet6_dev *idev = (struct inet6_dev *)data;
3105 struct net_device *dev = idev->dev;
3106 struct in6_addr lladdr;
3107
3108 write_lock(&idev->lock);
3109 if (idev->dead || !(idev->if_flags & IF_READY))
3110 goto out;
3111
3112 if (!ipv6_accept_ra(idev))
3113 goto out;
3114
3115 /* Announcement received after solicitation was sent */
3116 if (idev->if_flags & IF_RA_RCVD)
3117 goto out;
3118
3119 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3120 write_unlock(&idev->lock);
3121 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3122 ndisc_send_rs(dev, &lladdr,
3123 &in6addr_linklocal_allrouters);
3124 else
3125 goto put;
3126
3127 write_lock(&idev->lock);
3128 /* The wait after the last probe can be shorter */
3129 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3130 idev->cnf.rtr_solicits) ?
3131 idev->cnf.rtr_solicit_delay :
3132 idev->cnf.rtr_solicit_interval);
3133 } else {
3134 /*
3135 * Note: we do not support deprecated "all on-link"
3136 * assumption any longer.
3137 */
3138 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3139 }
3140
3141 out:
3142 write_unlock(&idev->lock);
3143 put:
3144 in6_dev_put(idev);
3145 }
3146
3147 /*
3148 * Duplicate Address Detection
3149 */
3150 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3151 {
3152 unsigned long rand_num;
3153 struct inet6_dev *idev = ifp->idev;
3154
3155 if (ifp->flags & IFA_F_OPTIMISTIC)
3156 rand_num = 0;
3157 else
3158 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3159
3160 ifp->dad_probes = idev->cnf.dad_transmits;
3161 addrconf_mod_dad_work(ifp, rand_num);
3162 }
3163
3164 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3165 {
3166 struct inet6_dev *idev = ifp->idev;
3167 struct net_device *dev = idev->dev;
3168
3169 addrconf_join_solict(dev, &ifp->addr);
3170
3171 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3172
3173 read_lock_bh(&idev->lock);
3174 spin_lock(&ifp->lock);
3175 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3176 goto out;
3177
3178 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3179 idev->cnf.accept_dad < 1 ||
3180 !(ifp->flags&IFA_F_TENTATIVE) ||
3181 ifp->flags & IFA_F_NODAD) {
3182 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3183 spin_unlock(&ifp->lock);
3184 read_unlock_bh(&idev->lock);
3185
3186 addrconf_dad_completed(ifp);
3187 return;
3188 }
3189
3190 if (!(idev->if_flags & IF_READY)) {
3191 spin_unlock(&ifp->lock);
3192 read_unlock_bh(&idev->lock);
3193 /*
3194 * If the device is not ready:
3195 * - keep it tentative if it is a permanent address.
3196 * - otherwise, kill it.
3197 */
3198 in6_ifa_hold(ifp);
3199 addrconf_dad_stop(ifp, 0);
3200 return;
3201 }
3202
3203 /*
3204 * Optimistic nodes can start receiving
3205 * Frames right away
3206 */
3207 if (ifp->flags & IFA_F_OPTIMISTIC)
3208 ip6_ins_rt(ifp->rt);
3209
3210 addrconf_dad_kick(ifp);
3211 out:
3212 spin_unlock(&ifp->lock);
3213 read_unlock_bh(&idev->lock);
3214 }
3215
3216 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3217 {
3218 bool begin_dad = false;
3219
3220 spin_lock_bh(&ifp->state_lock);
3221 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3222 ifp->state = INET6_IFADDR_STATE_PREDAD;
3223 begin_dad = true;
3224 }
3225 spin_unlock_bh(&ifp->state_lock);
3226
3227 if (begin_dad)
3228 addrconf_mod_dad_work(ifp, 0);
3229 }
3230
3231 static void addrconf_dad_work(struct work_struct *w)
3232 {
3233 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3234 struct inet6_ifaddr,
3235 dad_work);
3236 struct inet6_dev *idev = ifp->idev;
3237 struct in6_addr mcaddr;
3238
3239 enum {
3240 DAD_PROCESS,
3241 DAD_BEGIN,
3242 DAD_ABORT,
3243 } action = DAD_PROCESS;
3244
3245 rtnl_lock();
3246
3247 spin_lock_bh(&ifp->state_lock);
3248 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3249 action = DAD_BEGIN;
3250 ifp->state = INET6_IFADDR_STATE_DAD;
3251 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3252 action = DAD_ABORT;
3253 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3254 }
3255 spin_unlock_bh(&ifp->state_lock);
3256
3257 if (action == DAD_BEGIN) {
3258 addrconf_dad_begin(ifp);
3259 goto out;
3260 } else if (action == DAD_ABORT) {
3261 addrconf_dad_stop(ifp, 1);
3262 goto out;
3263 }
3264
3265 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3266 goto out;
3267
3268 write_lock_bh(&idev->lock);
3269 if (idev->dead || !(idev->if_flags & IF_READY)) {
3270 write_unlock_bh(&idev->lock);
3271 goto out;
3272 }
3273
3274 spin_lock(&ifp->lock);
3275 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3276 spin_unlock(&ifp->lock);
3277 write_unlock_bh(&idev->lock);
3278 goto out;
3279 }
3280
3281 if (ifp->dad_probes == 0) {
3282 /*
3283 * DAD was successful
3284 */
3285
3286 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3287 spin_unlock(&ifp->lock);
3288 write_unlock_bh(&idev->lock);
3289
3290 addrconf_dad_completed(ifp);
3291
3292 goto out;
3293 }
3294
3295 ifp->dad_probes--;
3296 addrconf_mod_dad_work(ifp,
3297 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3298 spin_unlock(&ifp->lock);
3299 write_unlock_bh(&idev->lock);
3300
3301 /* send a neighbour solicitation for our addr */
3302 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3303 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3304 out:
3305 in6_ifa_put(ifp);
3306 rtnl_unlock();
3307 }
3308
3309 /* ifp->idev must be at least read locked */
3310 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3311 {
3312 struct inet6_ifaddr *ifpiter;
3313 struct inet6_dev *idev = ifp->idev;
3314
3315 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3316 if (ifpiter->scope > IFA_LINK)
3317 break;
3318 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3319 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3320 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3321 IFA_F_PERMANENT)
3322 return false;
3323 }
3324 return true;
3325 }
3326
3327 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3328 {
3329 struct net_device *dev = ifp->idev->dev;
3330 struct in6_addr lladdr;
3331 bool send_rs, send_mld;
3332
3333 addrconf_del_dad_work(ifp);
3334
3335 /*
3336 * Configure the address for reception. Now it is valid.
3337 */
3338
3339 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3340
3341 /* If added prefix is link local and we are prepared to process
3342 router advertisements, start sending router solicitations.
3343 */
3344
3345 read_lock_bh(&ifp->idev->lock);
3346 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3347 send_rs = send_mld &&
3348 ipv6_accept_ra(ifp->idev) &&
3349 ifp->idev->cnf.rtr_solicits > 0 &&
3350 (dev->flags&IFF_LOOPBACK) == 0;
3351 read_unlock_bh(&ifp->idev->lock);
3352
3353 /* While dad is in progress mld report's source address is in6_addrany.
3354 * Resend with proper ll now.
3355 */
3356 if (send_mld)
3357 ipv6_mc_dad_complete(ifp->idev);
3358
3359 if (send_rs) {
3360 /*
3361 * If a host as already performed a random delay
3362 * [...] as part of DAD [...] there is no need
3363 * to delay again before sending the first RS
3364 */
3365 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3366 return;
3367 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3368
3369 write_lock_bh(&ifp->idev->lock);
3370 spin_lock(&ifp->lock);
3371 ifp->idev->rs_probes = 1;
3372 ifp->idev->if_flags |= IF_RS_SENT;
3373 addrconf_mod_rs_timer(ifp->idev,
3374 ifp->idev->cnf.rtr_solicit_interval);
3375 spin_unlock(&ifp->lock);
3376 write_unlock_bh(&ifp->idev->lock);
3377 }
3378 }
3379
3380 static void addrconf_dad_run(struct inet6_dev *idev)
3381 {
3382 struct inet6_ifaddr *ifp;
3383
3384 read_lock_bh(&idev->lock);
3385 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3386 spin_lock(&ifp->lock);
3387 if (ifp->flags & IFA_F_TENTATIVE &&
3388 ifp->state == INET6_IFADDR_STATE_DAD)
3389 addrconf_dad_kick(ifp);
3390 spin_unlock(&ifp->lock);
3391 }
3392 read_unlock_bh(&idev->lock);
3393 }
3394
3395 #ifdef CONFIG_PROC_FS
3396 struct if6_iter_state {
3397 struct seq_net_private p;
3398 int bucket;
3399 int offset;
3400 };
3401
3402 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3403 {
3404 struct inet6_ifaddr *ifa = NULL;
3405 struct if6_iter_state *state = seq->private;
3406 struct net *net = seq_file_net(seq);
3407 int p = 0;
3408
3409 /* initial bucket if pos is 0 */
3410 if (pos == 0) {
3411 state->bucket = 0;
3412 state->offset = 0;
3413 }
3414
3415 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3416 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3417 addr_lst) {
3418 if (!net_eq(dev_net(ifa->idev->dev), net))
3419 continue;
3420 /* sync with offset */
3421 if (p < state->offset) {
3422 p++;
3423 continue;
3424 }
3425 state->offset++;
3426 return ifa;
3427 }
3428
3429 /* prepare for next bucket */
3430 state->offset = 0;
3431 p = 0;
3432 }
3433 return NULL;
3434 }
3435
3436 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3437 struct inet6_ifaddr *ifa)
3438 {
3439 struct if6_iter_state *state = seq->private;
3440 struct net *net = seq_file_net(seq);
3441
3442 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3443 if (!net_eq(dev_net(ifa->idev->dev), net))
3444 continue;
3445 state->offset++;
3446 return ifa;
3447 }
3448
3449 while (++state->bucket < IN6_ADDR_HSIZE) {
3450 state->offset = 0;
3451 hlist_for_each_entry_rcu_bh(ifa,
3452 &inet6_addr_lst[state->bucket], addr_lst) {
3453 if (!net_eq(dev_net(ifa->idev->dev), net))
3454 continue;
3455 state->offset++;
3456 return ifa;
3457 }
3458 }
3459
3460 return NULL;
3461 }
3462
3463 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3464 __acquires(rcu_bh)
3465 {
3466 rcu_read_lock_bh();
3467 return if6_get_first(seq, *pos);
3468 }
3469
3470 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3471 {
3472 struct inet6_ifaddr *ifa;
3473
3474 ifa = if6_get_next(seq, v);
3475 ++*pos;
3476 return ifa;
3477 }
3478
3479 static void if6_seq_stop(struct seq_file *seq, void *v)
3480 __releases(rcu_bh)
3481 {
3482 rcu_read_unlock_bh();
3483 }
3484
3485 static int if6_seq_show(struct seq_file *seq, void *v)
3486 {
3487 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3488 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3489 &ifp->addr,
3490 ifp->idev->dev->ifindex,
3491 ifp->prefix_len,
3492 ifp->scope,
3493 (u8) ifp->flags,
3494 ifp->idev->dev->name);
3495 return 0;
3496 }
3497
3498 static const struct seq_operations if6_seq_ops = {
3499 .start = if6_seq_start,
3500 .next = if6_seq_next,
3501 .show = if6_seq_show,
3502 .stop = if6_seq_stop,
3503 };
3504
3505 static int if6_seq_open(struct inode *inode, struct file *file)
3506 {
3507 return seq_open_net(inode, file, &if6_seq_ops,
3508 sizeof(struct if6_iter_state));
3509 }
3510
3511 static const struct file_operations if6_fops = {
3512 .owner = THIS_MODULE,
3513 .open = if6_seq_open,
3514 .read = seq_read,
3515 .llseek = seq_lseek,
3516 .release = seq_release_net,
3517 };
3518
3519 static int __net_init if6_proc_net_init(struct net *net)
3520 {
3521 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3522 return -ENOMEM;
3523 return 0;
3524 }
3525
3526 static void __net_exit if6_proc_net_exit(struct net *net)
3527 {
3528 remove_proc_entry("if_inet6", net->proc_net);
3529 }
3530
3531 static struct pernet_operations if6_proc_net_ops = {
3532 .init = if6_proc_net_init,
3533 .exit = if6_proc_net_exit,
3534 };
3535
3536 int __init if6_proc_init(void)
3537 {
3538 return register_pernet_subsys(&if6_proc_net_ops);
3539 }
3540
3541 void if6_proc_exit(void)
3542 {
3543 unregister_pernet_subsys(&if6_proc_net_ops);
3544 }
3545 #endif /* CONFIG_PROC_FS */
3546
3547 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3548 /* Check if address is a home address configured on any interface. */
3549 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3550 {
3551 int ret = 0;
3552 struct inet6_ifaddr *ifp = NULL;
3553 unsigned int hash = inet6_addr_hash(addr);
3554
3555 rcu_read_lock_bh();
3556 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3557 if (!net_eq(dev_net(ifp->idev->dev), net))
3558 continue;
3559 if (ipv6_addr_equal(&ifp->addr, addr) &&
3560 (ifp->flags & IFA_F_HOMEADDRESS)) {
3561 ret = 1;
3562 break;
3563 }
3564 }
3565 rcu_read_unlock_bh();
3566 return ret;
3567 }
3568 #endif
3569
3570 /*
3571 * Periodic address status verification
3572 */
3573
3574 static void addrconf_verify_rtnl(void)
3575 {
3576 unsigned long now, next, next_sec, next_sched;
3577 struct inet6_ifaddr *ifp;
3578 int i;
3579
3580 ASSERT_RTNL();
3581
3582 rcu_read_lock_bh();
3583 now = jiffies;
3584 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3585
3586 cancel_delayed_work(&addr_chk_work);
3587
3588 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3589 restart:
3590 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3591 unsigned long age;
3592
3593 /* When setting preferred_lft to a value not zero or
3594 * infinity, while valid_lft is infinity
3595 * IFA_F_PERMANENT has a non-infinity life time.
3596 */
3597 if ((ifp->flags & IFA_F_PERMANENT) &&
3598 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3599 continue;
3600
3601 spin_lock(&ifp->lock);
3602 /* We try to batch several events at once. */
3603 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3604
3605 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3606 age >= ifp->valid_lft) {
3607 spin_unlock(&ifp->lock);
3608 in6_ifa_hold(ifp);
3609 ipv6_del_addr(ifp);
3610 goto restart;
3611 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3612 spin_unlock(&ifp->lock);
3613 continue;
3614 } else if (age >= ifp->prefered_lft) {
3615 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3616 int deprecate = 0;
3617
3618 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3619 deprecate = 1;
3620 ifp->flags |= IFA_F_DEPRECATED;
3621 }
3622
3623 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3624 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3625 next = ifp->tstamp + ifp->valid_lft * HZ;
3626
3627 spin_unlock(&ifp->lock);
3628
3629 if (deprecate) {
3630 in6_ifa_hold(ifp);
3631
3632 ipv6_ifa_notify(0, ifp);
3633 in6_ifa_put(ifp);
3634 goto restart;
3635 }
3636 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3637 !(ifp->flags&IFA_F_TENTATIVE)) {
3638 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3639 ifp->idev->cnf.dad_transmits *
3640 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3641
3642 if (age >= ifp->prefered_lft - regen_advance) {
3643 struct inet6_ifaddr *ifpub = ifp->ifpub;
3644 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3645 next = ifp->tstamp + ifp->prefered_lft * HZ;
3646 if (!ifp->regen_count && ifpub) {
3647 ifp->regen_count++;
3648 in6_ifa_hold(ifp);
3649 in6_ifa_hold(ifpub);
3650 spin_unlock(&ifp->lock);
3651
3652 spin_lock(&ifpub->lock);
3653 ifpub->regen_count = 0;
3654 spin_unlock(&ifpub->lock);
3655 ipv6_create_tempaddr(ifpub, ifp);
3656 in6_ifa_put(ifpub);
3657 in6_ifa_put(ifp);
3658 goto restart;
3659 }
3660 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3661 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3662 spin_unlock(&ifp->lock);
3663 } else {
3664 /* ifp->prefered_lft <= ifp->valid_lft */
3665 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3666 next = ifp->tstamp + ifp->prefered_lft * HZ;
3667 spin_unlock(&ifp->lock);
3668 }
3669 }
3670 }
3671
3672 next_sec = round_jiffies_up(next);
3673 next_sched = next;
3674
3675 /* If rounded timeout is accurate enough, accept it. */
3676 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3677 next_sched = next_sec;
3678
3679 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3680 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3681 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3682
3683 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3684 now, next, next_sec, next_sched);
3685 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
3686 rcu_read_unlock_bh();
3687 }
3688
3689 static void addrconf_verify_work(struct work_struct *w)
3690 {
3691 rtnl_lock();
3692 addrconf_verify_rtnl();
3693 rtnl_unlock();
3694 }
3695
3696 static void addrconf_verify(void)
3697 {
3698 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3699 }
3700
3701 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3702 struct in6_addr **peer_pfx)
3703 {
3704 struct in6_addr *pfx = NULL;
3705
3706 *peer_pfx = NULL;
3707
3708 if (addr)
3709 pfx = nla_data(addr);
3710
3711 if (local) {
3712 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3713 *peer_pfx = pfx;
3714 pfx = nla_data(local);
3715 }
3716
3717 return pfx;
3718 }
3719
3720 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3721 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3722 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3723 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3724 [IFA_FLAGS] = { .len = sizeof(u32) },
3725 };
3726
3727 static int
3728 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3729 {
3730 struct net *net = sock_net(skb->sk);
3731 struct ifaddrmsg *ifm;
3732 struct nlattr *tb[IFA_MAX+1];
3733 struct in6_addr *pfx, *peer_pfx;
3734 u32 ifa_flags;
3735 int err;
3736
3737 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3738 if (err < 0)
3739 return err;
3740
3741 ifm = nlmsg_data(nlh);
3742 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3743 if (pfx == NULL)
3744 return -EINVAL;
3745
3746 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3747
3748 /* We ignore other flags so far. */
3749 ifa_flags &= IFA_F_MANAGETEMPADDR;
3750
3751 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
3752 ifm->ifa_prefixlen);
3753 }
3754
3755 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
3756 u32 prefered_lft, u32 valid_lft)
3757 {
3758 u32 flags;
3759 clock_t expires;
3760 unsigned long timeout;
3761 bool was_managetempaddr;
3762 bool had_prefixroute;
3763
3764 ASSERT_RTNL();
3765
3766 if (!valid_lft || (prefered_lft > valid_lft))
3767 return -EINVAL;
3768
3769 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3770 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3771 return -EINVAL;
3772
3773 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3774 if (addrconf_finite_timeout(timeout)) {
3775 expires = jiffies_to_clock_t(timeout * HZ);
3776 valid_lft = timeout;
3777 flags = RTF_EXPIRES;
3778 } else {
3779 expires = 0;
3780 flags = 0;
3781 ifa_flags |= IFA_F_PERMANENT;
3782 }
3783
3784 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3785 if (addrconf_finite_timeout(timeout)) {
3786 if (timeout == 0)
3787 ifa_flags |= IFA_F_DEPRECATED;
3788 prefered_lft = timeout;
3789 }
3790
3791 spin_lock_bh(&ifp->lock);
3792 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
3793 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
3794 !(ifp->flags & IFA_F_NOPREFIXROUTE);
3795 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
3796 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3797 IFA_F_NOPREFIXROUTE);
3798 ifp->flags |= ifa_flags;
3799 ifp->tstamp = jiffies;
3800 ifp->valid_lft = valid_lft;
3801 ifp->prefered_lft = prefered_lft;
3802
3803 spin_unlock_bh(&ifp->lock);
3804 if (!(ifp->flags&IFA_F_TENTATIVE))
3805 ipv6_ifa_notify(0, ifp);
3806
3807 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
3808 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3809 expires, flags);
3810 } else if (had_prefixroute) {
3811 enum cleanup_prefix_rt_t action;
3812 unsigned long rt_expires;
3813
3814 write_lock_bh(&ifp->idev->lock);
3815 action = check_cleanup_prefix_route(ifp, &rt_expires);
3816 write_unlock_bh(&ifp->idev->lock);
3817
3818 if (action != CLEANUP_PREFIX_RT_NOP) {
3819 cleanup_prefix_route(ifp, rt_expires,
3820 action == CLEANUP_PREFIX_RT_DEL);
3821 }
3822 }
3823
3824 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3825 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3826 valid_lft = prefered_lft = 0;
3827 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3828 !was_managetempaddr, jiffies);
3829 }
3830
3831 addrconf_verify_rtnl();
3832
3833 return 0;
3834 }
3835
3836 static int
3837 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3838 {
3839 struct net *net = sock_net(skb->sk);
3840 struct ifaddrmsg *ifm;
3841 struct nlattr *tb[IFA_MAX+1];
3842 struct in6_addr *pfx, *peer_pfx;
3843 struct inet6_ifaddr *ifa;
3844 struct net_device *dev;
3845 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3846 u32 ifa_flags;
3847 int err;
3848
3849 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3850 if (err < 0)
3851 return err;
3852
3853 ifm = nlmsg_data(nlh);
3854 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3855 if (pfx == NULL)
3856 return -EINVAL;
3857
3858 if (tb[IFA_CACHEINFO]) {
3859 struct ifa_cacheinfo *ci;
3860
3861 ci = nla_data(tb[IFA_CACHEINFO]);
3862 valid_lft = ci->ifa_valid;
3863 preferred_lft = ci->ifa_prefered;
3864 } else {
3865 preferred_lft = INFINITY_LIFE_TIME;
3866 valid_lft = INFINITY_LIFE_TIME;
3867 }
3868
3869 dev = __dev_get_by_index(net, ifm->ifa_index);
3870 if (dev == NULL)
3871 return -ENODEV;
3872
3873 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3874
3875 /* We ignore other flags so far. */
3876 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3877 IFA_F_NOPREFIXROUTE;
3878
3879 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3880 if (ifa == NULL) {
3881 /*
3882 * It would be best to check for !NLM_F_CREATE here but
3883 * userspace already relies on not having to provide this.
3884 */
3885 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3886 ifm->ifa_prefixlen, ifa_flags,
3887 preferred_lft, valid_lft);
3888 }
3889
3890 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3891 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3892 err = -EEXIST;
3893 else
3894 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3895
3896 in6_ifa_put(ifa);
3897
3898 return err;
3899 }
3900
3901 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
3902 u8 scope, int ifindex)
3903 {
3904 struct ifaddrmsg *ifm;
3905
3906 ifm = nlmsg_data(nlh);
3907 ifm->ifa_family = AF_INET6;
3908 ifm->ifa_prefixlen = prefixlen;
3909 ifm->ifa_flags = flags;
3910 ifm->ifa_scope = scope;
3911 ifm->ifa_index = ifindex;
3912 }
3913
3914 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3915 unsigned long tstamp, u32 preferred, u32 valid)
3916 {
3917 struct ifa_cacheinfo ci;
3918
3919 ci.cstamp = cstamp_delta(cstamp);
3920 ci.tstamp = cstamp_delta(tstamp);
3921 ci.ifa_prefered = preferred;
3922 ci.ifa_valid = valid;
3923
3924 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3925 }
3926
3927 static inline int rt_scope(int ifa_scope)
3928 {
3929 if (ifa_scope & IFA_HOST)
3930 return RT_SCOPE_HOST;
3931 else if (ifa_scope & IFA_LINK)
3932 return RT_SCOPE_LINK;
3933 else if (ifa_scope & IFA_SITE)
3934 return RT_SCOPE_SITE;
3935 else
3936 return RT_SCOPE_UNIVERSE;
3937 }
3938
3939 static inline int inet6_ifaddr_msgsize(void)
3940 {
3941 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3942 + nla_total_size(16) /* IFA_LOCAL */
3943 + nla_total_size(16) /* IFA_ADDRESS */
3944 + nla_total_size(sizeof(struct ifa_cacheinfo))
3945 + nla_total_size(4) /* IFA_FLAGS */;
3946 }
3947
3948 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3949 u32 portid, u32 seq, int event, unsigned int flags)
3950 {
3951 struct nlmsghdr *nlh;
3952 u32 preferred, valid;
3953
3954 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3955 if (nlh == NULL)
3956 return -EMSGSIZE;
3957
3958 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3959 ifa->idev->dev->ifindex);
3960
3961 if (!((ifa->flags&IFA_F_PERMANENT) &&
3962 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
3963 preferred = ifa->prefered_lft;
3964 valid = ifa->valid_lft;
3965 if (preferred != INFINITY_LIFE_TIME) {
3966 long tval = (jiffies - ifa->tstamp)/HZ;
3967 if (preferred > tval)
3968 preferred -= tval;
3969 else
3970 preferred = 0;
3971 if (valid != INFINITY_LIFE_TIME) {
3972 if (valid > tval)
3973 valid -= tval;
3974 else
3975 valid = 0;
3976 }
3977 }
3978 } else {
3979 preferred = INFINITY_LIFE_TIME;
3980 valid = INFINITY_LIFE_TIME;
3981 }
3982
3983 if (!ipv6_addr_any(&ifa->peer_addr)) {
3984 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3985 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3986 goto error;
3987 } else
3988 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3989 goto error;
3990
3991 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3992 goto error;
3993
3994 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
3995 goto error;
3996
3997 return nlmsg_end(skb, nlh);
3998
3999 error:
4000 nlmsg_cancel(skb, nlh);
4001 return -EMSGSIZE;
4002 }
4003
4004 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4005 u32 portid, u32 seq, int event, u16 flags)
4006 {
4007 struct nlmsghdr *nlh;
4008 u8 scope = RT_SCOPE_UNIVERSE;
4009 int ifindex = ifmca->idev->dev->ifindex;
4010
4011 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4012 scope = RT_SCOPE_SITE;
4013
4014 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4015 if (nlh == NULL)
4016 return -EMSGSIZE;
4017
4018 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4019 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
4020 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4021 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4022 nlmsg_cancel(skb, nlh);
4023 return -EMSGSIZE;
4024 }
4025
4026 return nlmsg_end(skb, nlh);
4027 }
4028
4029 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4030 u32 portid, u32 seq, int event, unsigned int flags)
4031 {
4032 struct nlmsghdr *nlh;
4033 u8 scope = RT_SCOPE_UNIVERSE;
4034 int ifindex = ifaca->aca_idev->dev->ifindex;
4035
4036 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4037 scope = RT_SCOPE_SITE;
4038
4039 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4040 if (nlh == NULL)
4041 return -EMSGSIZE;
4042
4043 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4044 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
4045 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4046 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4047 nlmsg_cancel(skb, nlh);
4048 return -EMSGSIZE;
4049 }
4050
4051 return nlmsg_end(skb, nlh);
4052 }
4053
4054 enum addr_type_t {
4055 UNICAST_ADDR,
4056 MULTICAST_ADDR,
4057 ANYCAST_ADDR,
4058 };
4059
4060 /* called with rcu_read_lock() */
4061 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4062 struct netlink_callback *cb, enum addr_type_t type,
4063 int s_ip_idx, int *p_ip_idx)
4064 {
4065 struct ifmcaddr6 *ifmca;
4066 struct ifacaddr6 *ifaca;
4067 int err = 1;
4068 int ip_idx = *p_ip_idx;
4069
4070 read_lock_bh(&idev->lock);
4071 switch (type) {
4072 case UNICAST_ADDR: {
4073 struct inet6_ifaddr *ifa;
4074
4075 /* unicast address incl. temp addr */
4076 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4077 if (++ip_idx < s_ip_idx)
4078 continue;
4079 err = inet6_fill_ifaddr(skb, ifa,
4080 NETLINK_CB(cb->skb).portid,
4081 cb->nlh->nlmsg_seq,
4082 RTM_NEWADDR,
4083 NLM_F_MULTI);
4084 if (err <= 0)
4085 break;
4086 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4087 }
4088 break;
4089 }
4090 case MULTICAST_ADDR:
4091 /* multicast address */
4092 for (ifmca = idev->mc_list; ifmca;
4093 ifmca = ifmca->next, ip_idx++) {
4094 if (ip_idx < s_ip_idx)
4095 continue;
4096 err = inet6_fill_ifmcaddr(skb, ifmca,
4097 NETLINK_CB(cb->skb).portid,
4098 cb->nlh->nlmsg_seq,
4099 RTM_GETMULTICAST,
4100 NLM_F_MULTI);
4101 if (err <= 0)
4102 break;
4103 }
4104 break;
4105 case ANYCAST_ADDR:
4106 /* anycast address */
4107 for (ifaca = idev->ac_list; ifaca;
4108 ifaca = ifaca->aca_next, ip_idx++) {
4109 if (ip_idx < s_ip_idx)
4110 continue;
4111 err = inet6_fill_ifacaddr(skb, ifaca,
4112 NETLINK_CB(cb->skb).portid,
4113 cb->nlh->nlmsg_seq,
4114 RTM_GETANYCAST,
4115 NLM_F_MULTI);
4116 if (err <= 0)
4117 break;
4118 }
4119 break;
4120 default:
4121 break;
4122 }
4123 read_unlock_bh(&idev->lock);
4124 *p_ip_idx = ip_idx;
4125 return err;
4126 }
4127
4128 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4129 enum addr_type_t type)
4130 {
4131 struct net *net = sock_net(skb->sk);
4132 int h, s_h;
4133 int idx, ip_idx;
4134 int s_idx, s_ip_idx;
4135 struct net_device *dev;
4136 struct inet6_dev *idev;
4137 struct hlist_head *head;
4138
4139 s_h = cb->args[0];
4140 s_idx = idx = cb->args[1];
4141 s_ip_idx = ip_idx = cb->args[2];
4142
4143 rcu_read_lock();
4144 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4145 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4146 idx = 0;
4147 head = &net->dev_index_head[h];
4148 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4149 if (idx < s_idx)
4150 goto cont;
4151 if (h > s_h || idx > s_idx)
4152 s_ip_idx = 0;
4153 ip_idx = 0;
4154 idev = __in6_dev_get(dev);
4155 if (!idev)
4156 goto cont;
4157
4158 if (in6_dump_addrs(idev, skb, cb, type,
4159 s_ip_idx, &ip_idx) <= 0)
4160 goto done;
4161 cont:
4162 idx++;
4163 }
4164 }
4165 done:
4166 rcu_read_unlock();
4167 cb->args[0] = h;
4168 cb->args[1] = idx;
4169 cb->args[2] = ip_idx;
4170
4171 return skb->len;
4172 }
4173
4174 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4175 {
4176 enum addr_type_t type = UNICAST_ADDR;
4177
4178 return inet6_dump_addr(skb, cb, type);
4179 }
4180
4181 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4182 {
4183 enum addr_type_t type = MULTICAST_ADDR;
4184
4185 return inet6_dump_addr(skb, cb, type);
4186 }
4187
4188
4189 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4190 {
4191 enum addr_type_t type = ANYCAST_ADDR;
4192
4193 return inet6_dump_addr(skb, cb, type);
4194 }
4195
4196 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4197 {
4198 struct net *net = sock_net(in_skb->sk);
4199 struct ifaddrmsg *ifm;
4200 struct nlattr *tb[IFA_MAX+1];
4201 struct in6_addr *addr = NULL, *peer;
4202 struct net_device *dev = NULL;
4203 struct inet6_ifaddr *ifa;
4204 struct sk_buff *skb;
4205 int err;
4206
4207 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4208 if (err < 0)
4209 goto errout;
4210
4211 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4212 if (addr == NULL) {
4213 err = -EINVAL;
4214 goto errout;
4215 }
4216
4217 ifm = nlmsg_data(nlh);
4218 if (ifm->ifa_index)
4219 dev = __dev_get_by_index(net, ifm->ifa_index);
4220
4221 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4222 if (!ifa) {
4223 err = -EADDRNOTAVAIL;
4224 goto errout;
4225 }
4226
4227 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4228 if (!skb) {
4229 err = -ENOBUFS;
4230 goto errout_ifa;
4231 }
4232
4233 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4234 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4235 if (err < 0) {
4236 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4237 WARN_ON(err == -EMSGSIZE);
4238 kfree_skb(skb);
4239 goto errout_ifa;
4240 }
4241 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4242 errout_ifa:
4243 in6_ifa_put(ifa);
4244 errout:
4245 return err;
4246 }
4247
4248 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4249 {
4250 struct sk_buff *skb;
4251 struct net *net = dev_net(ifa->idev->dev);
4252 int err = -ENOBUFS;
4253
4254 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4255 if (skb == NULL)
4256 goto errout;
4257
4258 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4259 if (err < 0) {
4260 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4261 WARN_ON(err == -EMSGSIZE);
4262 kfree_skb(skb);
4263 goto errout;
4264 }
4265 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4266 return;
4267 errout:
4268 if (err < 0)
4269 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4270 }
4271
4272 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4273 __s32 *array, int bytes)
4274 {
4275 BUG_ON(bytes < (DEVCONF_MAX * 4));
4276
4277 memset(array, 0, bytes);
4278 array[DEVCONF_FORWARDING] = cnf->forwarding;
4279 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4280 array[DEVCONF_MTU6] = cnf->mtu6;
4281 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4282 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4283 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4284 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4285 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4286 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4287 jiffies_to_msecs(cnf->rtr_solicit_interval);
4288 array[DEVCONF_RTR_SOLICIT_DELAY] =
4289 jiffies_to_msecs(cnf->rtr_solicit_delay);
4290 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4291 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4292 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4293 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4294 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4295 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4296 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4297 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4298 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4299 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4300 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4301 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4302 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4303 #ifdef CONFIG_IPV6_ROUTER_PREF
4304 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4305 array[DEVCONF_RTR_PROBE_INTERVAL] =
4306 jiffies_to_msecs(cnf->rtr_probe_interval);
4307 #ifdef CONFIG_IPV6_ROUTE_INFO
4308 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4309 #endif
4310 #endif
4311 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4312 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4313 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4314 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4315 #endif
4316 #ifdef CONFIG_IPV6_MROUTE
4317 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4318 #endif
4319 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4320 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4321 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4322 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4323 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4324 }
4325
4326 static inline size_t inet6_ifla6_size(void)
4327 {
4328 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4329 + nla_total_size(sizeof(struct ifla_cacheinfo))
4330 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4331 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4332 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4333 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4334 }
4335
4336 static inline size_t inet6_if_nlmsg_size(void)
4337 {
4338 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4339 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4340 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4341 + nla_total_size(4) /* IFLA_MTU */
4342 + nla_total_size(4) /* IFLA_LINK */
4343 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4344 }
4345
4346 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4347 int items, int bytes)
4348 {
4349 int i;
4350 int pad = bytes - sizeof(u64) * items;
4351 BUG_ON(pad < 0);
4352
4353 /* Use put_unaligned() because stats may not be aligned for u64. */
4354 put_unaligned(items, &stats[0]);
4355 for (i = 1; i < items; i++)
4356 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4357
4358 memset(&stats[items], 0, pad);
4359 }
4360
4361 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4362 int items, int bytes, size_t syncpoff)
4363 {
4364 int i;
4365 int pad = bytes - sizeof(u64) * items;
4366 BUG_ON(pad < 0);
4367
4368 /* Use put_unaligned() because stats may not be aligned for u64. */
4369 put_unaligned(items, &stats[0]);
4370 for (i = 1; i < items; i++)
4371 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4372
4373 memset(&stats[items], 0, pad);
4374 }
4375
4376 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4377 int bytes)
4378 {
4379 switch (attrtype) {
4380 case IFLA_INET6_STATS:
4381 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4382 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4383 break;
4384 case IFLA_INET6_ICMP6STATS:
4385 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4386 break;
4387 }
4388 }
4389
4390 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4391 {
4392 struct nlattr *nla;
4393 struct ifla_cacheinfo ci;
4394
4395 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4396 goto nla_put_failure;
4397 ci.max_reasm_len = IPV6_MAXPLEN;
4398 ci.tstamp = cstamp_delta(idev->tstamp);
4399 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4400 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4401 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4402 goto nla_put_failure;
4403 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4404 if (nla == NULL)
4405 goto nla_put_failure;
4406 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4407
4408 /* XXX - MC not implemented */
4409
4410 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4411 if (nla == NULL)
4412 goto nla_put_failure;
4413 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4414
4415 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4416 if (nla == NULL)
4417 goto nla_put_failure;
4418 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4419
4420 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4421 if (nla == NULL)
4422 goto nla_put_failure;
4423 read_lock_bh(&idev->lock);
4424 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4425 read_unlock_bh(&idev->lock);
4426
4427 return 0;
4428
4429 nla_put_failure:
4430 return -EMSGSIZE;
4431 }
4432
4433 static size_t inet6_get_link_af_size(const struct net_device *dev)
4434 {
4435 if (!__in6_dev_get(dev))
4436 return 0;
4437
4438 return inet6_ifla6_size();
4439 }
4440
4441 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4442 {
4443 struct inet6_dev *idev = __in6_dev_get(dev);
4444
4445 if (!idev)
4446 return -ENODATA;
4447
4448 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4449 return -EMSGSIZE;
4450
4451 return 0;
4452 }
4453
4454 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4455 {
4456 struct inet6_ifaddr *ifp;
4457 struct net_device *dev = idev->dev;
4458 bool update_rs = false;
4459 struct in6_addr ll_addr;
4460
4461 ASSERT_RTNL();
4462
4463 if (token == NULL)
4464 return -EINVAL;
4465 if (ipv6_addr_any(token))
4466 return -EINVAL;
4467 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4468 return -EINVAL;
4469 if (!ipv6_accept_ra(idev))
4470 return -EINVAL;
4471 if (idev->cnf.rtr_solicits <= 0)
4472 return -EINVAL;
4473
4474 write_lock_bh(&idev->lock);
4475
4476 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4477 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4478
4479 write_unlock_bh(&idev->lock);
4480
4481 if (!idev->dead && (idev->if_flags & IF_READY) &&
4482 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4483 IFA_F_OPTIMISTIC)) {
4484
4485 /* If we're not ready, then normal ifup will take care
4486 * of this. Otherwise, we need to request our rs here.
4487 */
4488 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4489 update_rs = true;
4490 }
4491
4492 write_lock_bh(&idev->lock);
4493
4494 if (update_rs) {
4495 idev->if_flags |= IF_RS_SENT;
4496 idev->rs_probes = 1;
4497 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4498 }
4499
4500 /* Well, that's kinda nasty ... */
4501 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4502 spin_lock(&ifp->lock);
4503 if (ifp->tokenized) {
4504 ifp->valid_lft = 0;
4505 ifp->prefered_lft = 0;
4506 }
4507 spin_unlock(&ifp->lock);
4508 }
4509
4510 write_unlock_bh(&idev->lock);
4511 addrconf_verify_rtnl();
4512 return 0;
4513 }
4514
4515 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4516 {
4517 int err = -EINVAL;
4518 struct inet6_dev *idev = __in6_dev_get(dev);
4519 struct nlattr *tb[IFLA_INET6_MAX + 1];
4520
4521 if (!idev)
4522 return -EAFNOSUPPORT;
4523
4524 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4525 BUG();
4526
4527 if (tb[IFLA_INET6_TOKEN])
4528 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4529
4530 return err;
4531 }
4532
4533 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4534 u32 portid, u32 seq, int event, unsigned int flags)
4535 {
4536 struct net_device *dev = idev->dev;
4537 struct ifinfomsg *hdr;
4538 struct nlmsghdr *nlh;
4539 void *protoinfo;
4540
4541 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4542 if (nlh == NULL)
4543 return -EMSGSIZE;
4544
4545 hdr = nlmsg_data(nlh);
4546 hdr->ifi_family = AF_INET6;
4547 hdr->__ifi_pad = 0;
4548 hdr->ifi_type = dev->type;
4549 hdr->ifi_index = dev->ifindex;
4550 hdr->ifi_flags = dev_get_flags(dev);
4551 hdr->ifi_change = 0;
4552
4553 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4554 (dev->addr_len &&
4555 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4556 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4557 (dev->ifindex != dev->iflink &&
4558 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4559 goto nla_put_failure;
4560 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4561 if (protoinfo == NULL)
4562 goto nla_put_failure;
4563
4564 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4565 goto nla_put_failure;
4566
4567 nla_nest_end(skb, protoinfo);
4568 return nlmsg_end(skb, nlh);
4569
4570 nla_put_failure:
4571 nlmsg_cancel(skb, nlh);
4572 return -EMSGSIZE;
4573 }
4574
4575 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4576 {
4577 struct net *net = sock_net(skb->sk);
4578 int h, s_h;
4579 int idx = 0, s_idx;
4580 struct net_device *dev;
4581 struct inet6_dev *idev;
4582 struct hlist_head *head;
4583
4584 s_h = cb->args[0];
4585 s_idx = cb->args[1];
4586
4587 rcu_read_lock();
4588 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4589 idx = 0;
4590 head = &net->dev_index_head[h];
4591 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4592 if (idx < s_idx)
4593 goto cont;
4594 idev = __in6_dev_get(dev);
4595 if (!idev)
4596 goto cont;
4597 if (inet6_fill_ifinfo(skb, idev,
4598 NETLINK_CB(cb->skb).portid,
4599 cb->nlh->nlmsg_seq,
4600 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4601 goto out;
4602 cont:
4603 idx++;
4604 }
4605 }
4606 out:
4607 rcu_read_unlock();
4608 cb->args[1] = idx;
4609 cb->args[0] = h;
4610
4611 return skb->len;
4612 }
4613
4614 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4615 {
4616 struct sk_buff *skb;
4617 struct net *net = dev_net(idev->dev);
4618 int err = -ENOBUFS;
4619
4620 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4621 if (skb == NULL)
4622 goto errout;
4623
4624 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4625 if (err < 0) {
4626 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4627 WARN_ON(err == -EMSGSIZE);
4628 kfree_skb(skb);
4629 goto errout;
4630 }
4631 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4632 return;
4633 errout:
4634 if (err < 0)
4635 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4636 }
4637
4638 static inline size_t inet6_prefix_nlmsg_size(void)
4639 {
4640 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4641 + nla_total_size(sizeof(struct in6_addr))
4642 + nla_total_size(sizeof(struct prefix_cacheinfo));
4643 }
4644
4645 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4646 struct prefix_info *pinfo, u32 portid, u32 seq,
4647 int event, unsigned int flags)
4648 {
4649 struct prefixmsg *pmsg;
4650 struct nlmsghdr *nlh;
4651 struct prefix_cacheinfo ci;
4652
4653 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4654 if (nlh == NULL)
4655 return -EMSGSIZE;
4656
4657 pmsg = nlmsg_data(nlh);
4658 pmsg->prefix_family = AF_INET6;
4659 pmsg->prefix_pad1 = 0;
4660 pmsg->prefix_pad2 = 0;
4661 pmsg->prefix_ifindex = idev->dev->ifindex;
4662 pmsg->prefix_len = pinfo->prefix_len;
4663 pmsg->prefix_type = pinfo->type;
4664 pmsg->prefix_pad3 = 0;
4665 pmsg->prefix_flags = 0;
4666 if (pinfo->onlink)
4667 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4668 if (pinfo->autoconf)
4669 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4670
4671 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4672 goto nla_put_failure;
4673 ci.preferred_time = ntohl(pinfo->prefered);
4674 ci.valid_time = ntohl(pinfo->valid);
4675 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4676 goto nla_put_failure;
4677 return nlmsg_end(skb, nlh);
4678
4679 nla_put_failure:
4680 nlmsg_cancel(skb, nlh);
4681 return -EMSGSIZE;
4682 }
4683
4684 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4685 struct prefix_info *pinfo)
4686 {
4687 struct sk_buff *skb;
4688 struct net *net = dev_net(idev->dev);
4689 int err = -ENOBUFS;
4690
4691 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4692 if (skb == NULL)
4693 goto errout;
4694
4695 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4696 if (err < 0) {
4697 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4698 WARN_ON(err == -EMSGSIZE);
4699 kfree_skb(skb);
4700 goto errout;
4701 }
4702 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4703 return;
4704 errout:
4705 if (err < 0)
4706 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4707 }
4708
4709 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4710 {
4711 struct net *net = dev_net(ifp->idev->dev);
4712
4713 if (event)
4714 ASSERT_RTNL();
4715
4716 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4717
4718 switch (event) {
4719 case RTM_NEWADDR:
4720 /*
4721 * If the address was optimistic
4722 * we inserted the route at the start of
4723 * our DAD process, so we don't need
4724 * to do it again
4725 */
4726 if (!(ifp->rt->rt6i_node))
4727 ip6_ins_rt(ifp->rt);
4728 if (ifp->idev->cnf.forwarding)
4729 addrconf_join_anycast(ifp);
4730 if (!ipv6_addr_any(&ifp->peer_addr))
4731 addrconf_prefix_route(&ifp->peer_addr, 128,
4732 ifp->idev->dev, 0, 0);
4733 break;
4734 case RTM_DELADDR:
4735 if (ifp->idev->cnf.forwarding)
4736 addrconf_leave_anycast(ifp);
4737 addrconf_leave_solict(ifp->idev, &ifp->addr);
4738 if (!ipv6_addr_any(&ifp->peer_addr)) {
4739 struct rt6_info *rt;
4740 struct net_device *dev = ifp->idev->dev;
4741
4742 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4743 dev->ifindex, 1);
4744 if (rt) {
4745 dst_hold(&rt->dst);
4746 if (ip6_del_rt(rt))
4747 dst_free(&rt->dst);
4748 }
4749 }
4750 dst_hold(&ifp->rt->dst);
4751
4752 if (ip6_del_rt(ifp->rt))
4753 dst_free(&ifp->rt->dst);
4754 break;
4755 }
4756 atomic_inc(&net->ipv6.dev_addr_genid);
4757 rt_genid_bump_ipv6(net);
4758 }
4759
4760 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4761 {
4762 rcu_read_lock_bh();
4763 if (likely(ifp->idev->dead == 0))
4764 __ipv6_ifa_notify(event, ifp);
4765 rcu_read_unlock_bh();
4766 }
4767
4768 #ifdef CONFIG_SYSCTL
4769
4770 static
4771 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4772 void __user *buffer, size_t *lenp, loff_t *ppos)
4773 {
4774 int *valp = ctl->data;
4775 int val = *valp;
4776 loff_t pos = *ppos;
4777 struct ctl_table lctl;
4778 int ret;
4779
4780 /*
4781 * ctl->data points to idev->cnf.forwarding, we should
4782 * not modify it until we get the rtnl lock.
4783 */
4784 lctl = *ctl;
4785 lctl.data = &val;
4786
4787 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4788
4789 if (write)
4790 ret = addrconf_fixup_forwarding(ctl, valp, val);
4791 if (ret)
4792 *ppos = pos;
4793 return ret;
4794 }
4795
4796 static void dev_disable_change(struct inet6_dev *idev)
4797 {
4798 struct netdev_notifier_info info;
4799
4800 if (!idev || !idev->dev)
4801 return;
4802
4803 netdev_notifier_info_init(&info, idev->dev);
4804 if (idev->cnf.disable_ipv6)
4805 addrconf_notify(NULL, NETDEV_DOWN, &info);
4806 else
4807 addrconf_notify(NULL, NETDEV_UP, &info);
4808 }
4809
4810 static void addrconf_disable_change(struct net *net, __s32 newf)
4811 {
4812 struct net_device *dev;
4813 struct inet6_dev *idev;
4814
4815 rcu_read_lock();
4816 for_each_netdev_rcu(net, dev) {
4817 idev = __in6_dev_get(dev);
4818 if (idev) {
4819 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4820 idev->cnf.disable_ipv6 = newf;
4821 if (changed)
4822 dev_disable_change(idev);
4823 }
4824 }
4825 rcu_read_unlock();
4826 }
4827
4828 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4829 {
4830 struct net *net;
4831 int old;
4832
4833 if (!rtnl_trylock())
4834 return restart_syscall();
4835
4836 net = (struct net *)table->extra2;
4837 old = *p;
4838 *p = newf;
4839
4840 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4841 rtnl_unlock();
4842 return 0;
4843 }
4844
4845 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4846 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4847 addrconf_disable_change(net, newf);
4848 } else if ((!newf) ^ (!old))
4849 dev_disable_change((struct inet6_dev *)table->extra1);
4850
4851 rtnl_unlock();
4852 return 0;
4853 }
4854
4855 static
4856 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4857 void __user *buffer, size_t *lenp, loff_t *ppos)
4858 {
4859 int *valp = ctl->data;
4860 int val = *valp;
4861 loff_t pos = *ppos;
4862 struct ctl_table lctl;
4863 int ret;
4864
4865 /*
4866 * ctl->data points to idev->cnf.disable_ipv6, we should
4867 * not modify it until we get the rtnl lock.
4868 */
4869 lctl = *ctl;
4870 lctl.data = &val;
4871
4872 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4873
4874 if (write)
4875 ret = addrconf_disable_ipv6(ctl, valp, val);
4876 if (ret)
4877 *ppos = pos;
4878 return ret;
4879 }
4880
4881 static
4882 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
4883 void __user *buffer, size_t *lenp, loff_t *ppos)
4884 {
4885 int *valp = ctl->data;
4886 int ret;
4887 int old, new;
4888
4889 old = *valp;
4890 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4891 new = *valp;
4892
4893 if (write && old != new) {
4894 struct net *net = ctl->extra2;
4895
4896 if (!rtnl_trylock())
4897 return restart_syscall();
4898
4899 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
4900 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4901 NETCONFA_IFINDEX_DEFAULT,
4902 net->ipv6.devconf_dflt);
4903 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
4904 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4905 NETCONFA_IFINDEX_ALL,
4906 net->ipv6.devconf_all);
4907 else {
4908 struct inet6_dev *idev = ctl->extra1;
4909
4910 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4911 idev->dev->ifindex,
4912 &idev->cnf);
4913 }
4914 rtnl_unlock();
4915 }
4916
4917 return ret;
4918 }
4919
4920
4921 static struct addrconf_sysctl_table
4922 {
4923 struct ctl_table_header *sysctl_header;
4924 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4925 } addrconf_sysctl __read_mostly = {
4926 .sysctl_header = NULL,
4927 .addrconf_vars = {
4928 {
4929 .procname = "forwarding",
4930 .data = &ipv6_devconf.forwarding,
4931 .maxlen = sizeof(int),
4932 .mode = 0644,
4933 .proc_handler = addrconf_sysctl_forward,
4934 },
4935 {
4936 .procname = "hop_limit",
4937 .data = &ipv6_devconf.hop_limit,
4938 .maxlen = sizeof(int),
4939 .mode = 0644,
4940 .proc_handler = proc_dointvec,
4941 },
4942 {
4943 .procname = "mtu",
4944 .data = &ipv6_devconf.mtu6,
4945 .maxlen = sizeof(int),
4946 .mode = 0644,
4947 .proc_handler = proc_dointvec,
4948 },
4949 {
4950 .procname = "accept_ra",
4951 .data = &ipv6_devconf.accept_ra,
4952 .maxlen = sizeof(int),
4953 .mode = 0644,
4954 .proc_handler = proc_dointvec,
4955 },
4956 {
4957 .procname = "accept_redirects",
4958 .data = &ipv6_devconf.accept_redirects,
4959 .maxlen = sizeof(int),
4960 .mode = 0644,
4961 .proc_handler = proc_dointvec,
4962 },
4963 {
4964 .procname = "autoconf",
4965 .data = &ipv6_devconf.autoconf,
4966 .maxlen = sizeof(int),
4967 .mode = 0644,
4968 .proc_handler = proc_dointvec,
4969 },
4970 {
4971 .procname = "dad_transmits",
4972 .data = &ipv6_devconf.dad_transmits,
4973 .maxlen = sizeof(int),
4974 .mode = 0644,
4975 .proc_handler = proc_dointvec,
4976 },
4977 {
4978 .procname = "router_solicitations",
4979 .data = &ipv6_devconf.rtr_solicits,
4980 .maxlen = sizeof(int),
4981 .mode = 0644,
4982 .proc_handler = proc_dointvec,
4983 },
4984 {
4985 .procname = "router_solicitation_interval",
4986 .data = &ipv6_devconf.rtr_solicit_interval,
4987 .maxlen = sizeof(int),
4988 .mode = 0644,
4989 .proc_handler = proc_dointvec_jiffies,
4990 },
4991 {
4992 .procname = "router_solicitation_delay",
4993 .data = &ipv6_devconf.rtr_solicit_delay,
4994 .maxlen = sizeof(int),
4995 .mode = 0644,
4996 .proc_handler = proc_dointvec_jiffies,
4997 },
4998 {
4999 .procname = "force_mld_version",
5000 .data = &ipv6_devconf.force_mld_version,
5001 .maxlen = sizeof(int),
5002 .mode = 0644,
5003 .proc_handler = proc_dointvec,
5004 },
5005 {
5006 .procname = "mldv1_unsolicited_report_interval",
5007 .data =
5008 &ipv6_devconf.mldv1_unsolicited_report_interval,
5009 .maxlen = sizeof(int),
5010 .mode = 0644,
5011 .proc_handler = proc_dointvec_ms_jiffies,
5012 },
5013 {
5014 .procname = "mldv2_unsolicited_report_interval",
5015 .data =
5016 &ipv6_devconf.mldv2_unsolicited_report_interval,
5017 .maxlen = sizeof(int),
5018 .mode = 0644,
5019 .proc_handler = proc_dointvec_ms_jiffies,
5020 },
5021 {
5022 .procname = "use_tempaddr",
5023 .data = &ipv6_devconf.use_tempaddr,
5024 .maxlen = sizeof(int),
5025 .mode = 0644,
5026 .proc_handler = proc_dointvec,
5027 },
5028 {
5029 .procname = "temp_valid_lft",
5030 .data = &ipv6_devconf.temp_valid_lft,
5031 .maxlen = sizeof(int),
5032 .mode = 0644,
5033 .proc_handler = proc_dointvec,
5034 },
5035 {
5036 .procname = "temp_prefered_lft",
5037 .data = &ipv6_devconf.temp_prefered_lft,
5038 .maxlen = sizeof(int),
5039 .mode = 0644,
5040 .proc_handler = proc_dointvec,
5041 },
5042 {
5043 .procname = "regen_max_retry",
5044 .data = &ipv6_devconf.regen_max_retry,
5045 .maxlen = sizeof(int),
5046 .mode = 0644,
5047 .proc_handler = proc_dointvec,
5048 },
5049 {
5050 .procname = "max_desync_factor",
5051 .data = &ipv6_devconf.max_desync_factor,
5052 .maxlen = sizeof(int),
5053 .mode = 0644,
5054 .proc_handler = proc_dointvec,
5055 },
5056 {
5057 .procname = "max_addresses",
5058 .data = &ipv6_devconf.max_addresses,
5059 .maxlen = sizeof(int),
5060 .mode = 0644,
5061 .proc_handler = proc_dointvec,
5062 },
5063 {
5064 .procname = "accept_ra_defrtr",
5065 .data = &ipv6_devconf.accept_ra_defrtr,
5066 .maxlen = sizeof(int),
5067 .mode = 0644,
5068 .proc_handler = proc_dointvec,
5069 },
5070 {
5071 .procname = "accept_ra_pinfo",
5072 .data = &ipv6_devconf.accept_ra_pinfo,
5073 .maxlen = sizeof(int),
5074 .mode = 0644,
5075 .proc_handler = proc_dointvec,
5076 },
5077 #ifdef CONFIG_IPV6_ROUTER_PREF
5078 {
5079 .procname = "accept_ra_rtr_pref",
5080 .data = &ipv6_devconf.accept_ra_rtr_pref,
5081 .maxlen = sizeof(int),
5082 .mode = 0644,
5083 .proc_handler = proc_dointvec,
5084 },
5085 {
5086 .procname = "router_probe_interval",
5087 .data = &ipv6_devconf.rtr_probe_interval,
5088 .maxlen = sizeof(int),
5089 .mode = 0644,
5090 .proc_handler = proc_dointvec_jiffies,
5091 },
5092 #ifdef CONFIG_IPV6_ROUTE_INFO
5093 {
5094 .procname = "accept_ra_rt_info_max_plen",
5095 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5096 .maxlen = sizeof(int),
5097 .mode = 0644,
5098 .proc_handler = proc_dointvec,
5099 },
5100 #endif
5101 #endif
5102 {
5103 .procname = "proxy_ndp",
5104 .data = &ipv6_devconf.proxy_ndp,
5105 .maxlen = sizeof(int),
5106 .mode = 0644,
5107 .proc_handler = addrconf_sysctl_proxy_ndp,
5108 },
5109 {
5110 .procname = "accept_source_route",
5111 .data = &ipv6_devconf.accept_source_route,
5112 .maxlen = sizeof(int),
5113 .mode = 0644,
5114 .proc_handler = proc_dointvec,
5115 },
5116 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5117 {
5118 .procname = "optimistic_dad",
5119 .data = &ipv6_devconf.optimistic_dad,
5120 .maxlen = sizeof(int),
5121 .mode = 0644,
5122 .proc_handler = proc_dointvec,
5123
5124 },
5125 #endif
5126 #ifdef CONFIG_IPV6_MROUTE
5127 {
5128 .procname = "mc_forwarding",
5129 .data = &ipv6_devconf.mc_forwarding,
5130 .maxlen = sizeof(int),
5131 .mode = 0444,
5132 .proc_handler = proc_dointvec,
5133 },
5134 #endif
5135 {
5136 .procname = "disable_ipv6",
5137 .data = &ipv6_devconf.disable_ipv6,
5138 .maxlen = sizeof(int),
5139 .mode = 0644,
5140 .proc_handler = addrconf_sysctl_disable,
5141 },
5142 {
5143 .procname = "accept_dad",
5144 .data = &ipv6_devconf.accept_dad,
5145 .maxlen = sizeof(int),
5146 .mode = 0644,
5147 .proc_handler = proc_dointvec,
5148 },
5149 {
5150 .procname = "force_tllao",
5151 .data = &ipv6_devconf.force_tllao,
5152 .maxlen = sizeof(int),
5153 .mode = 0644,
5154 .proc_handler = proc_dointvec
5155 },
5156 {
5157 .procname = "ndisc_notify",
5158 .data = &ipv6_devconf.ndisc_notify,
5159 .maxlen = sizeof(int),
5160 .mode = 0644,
5161 .proc_handler = proc_dointvec
5162 },
5163 {
5164 .procname = "suppress_frag_ndisc",
5165 .data = &ipv6_devconf.suppress_frag_ndisc,
5166 .maxlen = sizeof(int),
5167 .mode = 0644,
5168 .proc_handler = proc_dointvec
5169 },
5170 {
5171 /* sentinel */
5172 }
5173 },
5174 };
5175
5176 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5177 struct inet6_dev *idev, struct ipv6_devconf *p)
5178 {
5179 int i;
5180 struct addrconf_sysctl_table *t;
5181 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5182
5183 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5184 if (t == NULL)
5185 goto out;
5186
5187 for (i = 0; t->addrconf_vars[i].data; i++) {
5188 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5189 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5190 t->addrconf_vars[i].extra2 = net;
5191 }
5192
5193 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5194
5195 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5196 if (t->sysctl_header == NULL)
5197 goto free;
5198
5199 p->sysctl = t;
5200 return 0;
5201
5202 free:
5203 kfree(t);
5204 out:
5205 return -ENOBUFS;
5206 }
5207
5208 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5209 {
5210 struct addrconf_sysctl_table *t;
5211
5212 if (p->sysctl == NULL)
5213 return;
5214
5215 t = p->sysctl;
5216 p->sysctl = NULL;
5217 unregister_net_sysctl_table(t->sysctl_header);
5218 kfree(t);
5219 }
5220
5221 static void addrconf_sysctl_register(struct inet6_dev *idev)
5222 {
5223 neigh_sysctl_register(idev->dev, idev->nd_parms,
5224 &ndisc_ifinfo_sysctl_change);
5225 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5226 idev, &idev->cnf);
5227 }
5228
5229 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5230 {
5231 __addrconf_sysctl_unregister(&idev->cnf);
5232 neigh_sysctl_unregister(idev->nd_parms);
5233 }
5234
5235
5236 #endif
5237
5238 static int __net_init addrconf_init_net(struct net *net)
5239 {
5240 int err = -ENOMEM;
5241 struct ipv6_devconf *all, *dflt;
5242
5243 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5244 if (all == NULL)
5245 goto err_alloc_all;
5246
5247 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5248 if (dflt == NULL)
5249 goto err_alloc_dflt;
5250
5251 /* these will be inherited by all namespaces */
5252 dflt->autoconf = ipv6_defaults.autoconf;
5253 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5254
5255 net->ipv6.devconf_all = all;
5256 net->ipv6.devconf_dflt = dflt;
5257
5258 #ifdef CONFIG_SYSCTL
5259 err = __addrconf_sysctl_register(net, "all", NULL, all);
5260 if (err < 0)
5261 goto err_reg_all;
5262
5263 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5264 if (err < 0)
5265 goto err_reg_dflt;
5266 #endif
5267 return 0;
5268
5269 #ifdef CONFIG_SYSCTL
5270 err_reg_dflt:
5271 __addrconf_sysctl_unregister(all);
5272 err_reg_all:
5273 kfree(dflt);
5274 #endif
5275 err_alloc_dflt:
5276 kfree(all);
5277 err_alloc_all:
5278 return err;
5279 }
5280
5281 static void __net_exit addrconf_exit_net(struct net *net)
5282 {
5283 #ifdef CONFIG_SYSCTL
5284 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5285 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5286 #endif
5287 if (!net_eq(net, &init_net)) {
5288 kfree(net->ipv6.devconf_dflt);
5289 kfree(net->ipv6.devconf_all);
5290 }
5291 }
5292
5293 static struct pernet_operations addrconf_ops = {
5294 .init = addrconf_init_net,
5295 .exit = addrconf_exit_net,
5296 };
5297
5298 static struct rtnl_af_ops inet6_ops = {
5299 .family = AF_INET6,
5300 .fill_link_af = inet6_fill_link_af,
5301 .get_link_af_size = inet6_get_link_af_size,
5302 .set_link_af = inet6_set_link_af,
5303 };
5304
5305 /*
5306 * Init / cleanup code
5307 */
5308
5309 int __init addrconf_init(void)
5310 {
5311 int i, err;
5312
5313 err = ipv6_addr_label_init();
5314 if (err < 0) {
5315 pr_crit("%s: cannot initialize default policy table: %d\n",
5316 __func__, err);
5317 goto out;
5318 }
5319
5320 err = register_pernet_subsys(&addrconf_ops);
5321 if (err < 0)
5322 goto out_addrlabel;
5323
5324 addrconf_wq = create_workqueue("ipv6_addrconf");
5325 if (!addrconf_wq) {
5326 err = -ENOMEM;
5327 goto out_nowq;
5328 }
5329
5330 /* The addrconf netdev notifier requires that loopback_dev
5331 * has it's ipv6 private information allocated and setup
5332 * before it can bring up and give link-local addresses
5333 * to other devices which are up.
5334 *
5335 * Unfortunately, loopback_dev is not necessarily the first
5336 * entry in the global dev_base list of net devices. In fact,
5337 * it is likely to be the very last entry on that list.
5338 * So this causes the notifier registry below to try and
5339 * give link-local addresses to all devices besides loopback_dev
5340 * first, then loopback_dev, which cases all the non-loopback_dev
5341 * devices to fail to get a link-local address.
5342 *
5343 * So, as a temporary fix, allocate the ipv6 structure for
5344 * loopback_dev first by hand.
5345 * Longer term, all of the dependencies ipv6 has upon the loopback
5346 * device and it being up should be removed.
5347 */
5348 rtnl_lock();
5349 if (!ipv6_add_dev(init_net.loopback_dev))
5350 err = -ENOMEM;
5351 rtnl_unlock();
5352 if (err)
5353 goto errlo;
5354
5355 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5356 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5357
5358 register_netdevice_notifier(&ipv6_dev_notf);
5359
5360 addrconf_verify();
5361
5362 rtnl_af_register(&inet6_ops);
5363
5364 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5365 NULL);
5366 if (err < 0)
5367 goto errout;
5368
5369 /* Only the first call to __rtnl_register can fail */
5370 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5371 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5372 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5373 inet6_dump_ifaddr, NULL);
5374 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5375 inet6_dump_ifmcaddr, NULL);
5376 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5377 inet6_dump_ifacaddr, NULL);
5378 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5379 inet6_netconf_dump_devconf, NULL);
5380
5381 ipv6_addr_label_rtnl_register();
5382
5383 return 0;
5384 errout:
5385 rtnl_af_unregister(&inet6_ops);
5386 unregister_netdevice_notifier(&ipv6_dev_notf);
5387 errlo:
5388 destroy_workqueue(addrconf_wq);
5389 out_nowq:
5390 unregister_pernet_subsys(&addrconf_ops);
5391 out_addrlabel:
5392 ipv6_addr_label_cleanup();
5393 out:
5394 return err;
5395 }
5396
5397 void addrconf_cleanup(void)
5398 {
5399 struct net_device *dev;
5400 int i;
5401
5402 unregister_netdevice_notifier(&ipv6_dev_notf);
5403 unregister_pernet_subsys(&addrconf_ops);
5404 ipv6_addr_label_cleanup();
5405
5406 rtnl_lock();
5407
5408 __rtnl_af_unregister(&inet6_ops);
5409
5410 /* clean dev list */
5411 for_each_netdev(&init_net, dev) {
5412 if (__in6_dev_get(dev) == NULL)
5413 continue;
5414 addrconf_ifdown(dev, 1);
5415 }
5416 addrconf_ifdown(init_net.loopback_dev, 2);
5417
5418 /*
5419 * Check hash table.
5420 */
5421 spin_lock_bh(&addrconf_hash_lock);
5422 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5423 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5424 spin_unlock_bh(&addrconf_hash_lock);
5425 cancel_delayed_work(&addr_chk_work);
5426 rtnl_unlock();
5427
5428 destroy_workqueue(addrconf_wq);
5429 }
Linux kernel - Deliverables
This page took 0.144384 seconds and 5 git commands to generate.