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ipv6: generation of stable privacy addresses for link-local and autoconf
[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/inet.h>
50 #include <linux/in6.h>
51 #include <linux/netdevice.h>
52 #include <linux/if_addr.h>
53 #include <linux/if_arp.h>
54 #include <linux/if_arcnet.h>
55 #include <linux/if_infiniband.h>
56 #include <linux/route.h>
57 #include <linux/inetdevice.h>
58 #include <linux/init.h>
59 #include <linux/slab.h>
60 #ifdef CONFIG_SYSCTL
61 #include <linux/sysctl.h>
62 #endif
63 #include <linux/capability.h>
64 #include <linux/delay.h>
65 #include <linux/notifier.h>
66 #include <linux/string.h>
67 #include <linux/hash.h>
68
69 #include <net/net_namespace.h>
70 #include <net/sock.h>
71 #include <net/snmp.h>
72
73 #include <net/af_ieee802154.h>
74 #include <net/firewire.h>
75 #include <net/ipv6.h>
76 #include <net/protocol.h>
77 #include <net/ndisc.h>
78 #include <net/ip6_route.h>
79 #include <net/addrconf.h>
80 #include <net/tcp.h>
81 #include <net/ip.h>
82 #include <net/netlink.h>
83 #include <net/pkt_sched.h>
84 #include <linux/if_tunnel.h>
85 #include <linux/rtnetlink.h>
86 #include <linux/netconf.h>
87 #include <linux/random.h>
88 #include <linux/uaccess.h>
89 #include <asm/unaligned.h>
90
91 #include <linux/proc_fs.h>
92 #include <linux/seq_file.h>
93 #include <linux/export.h>
94
95 /* Set to 3 to get tracing... */
96 #define ACONF_DEBUG 2
97
98 #if ACONF_DEBUG >= 3
99 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
100 #else
101 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
102 #endif
103
104 #define INFINITY_LIFE_TIME 0xFFFFFFFF
105
106 #define IPV6_MAX_STRLEN \
107 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
108
109 static inline u32 cstamp_delta(unsigned long cstamp)
110 {
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
112 }
113
114 #ifdef CONFIG_SYSCTL
115 static int addrconf_sysctl_register(struct inet6_dev *idev);
116 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
117 #else
118 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
119 {
120 return 0;
121 }
122
123 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
124 {
125 }
126 #endif
127
128 static void __ipv6_regen_rndid(struct inet6_dev *idev);
129 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
130 static void ipv6_regen_rndid(unsigned long data);
131
132 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
133 static int ipv6_count_addresses(struct inet6_dev *idev);
134 static int ipv6_generate_stable_address(struct in6_addr *addr,
135 u8 dad_count,
136 const struct inet6_dev *idev);
137
138 /*
139 * Configured unicast address hash table
140 */
141 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
142 static DEFINE_SPINLOCK(addrconf_hash_lock);
143
144 static void addrconf_verify(void);
145 static void addrconf_verify_rtnl(void);
146 static void addrconf_verify_work(struct work_struct *);
147
148 static struct workqueue_struct *addrconf_wq;
149 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
150
151 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
152 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
153
154 static void addrconf_type_change(struct net_device *dev,
155 unsigned long event);
156 static int addrconf_ifdown(struct net_device *dev, int how);
157
158 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
159 int plen,
160 const struct net_device *dev,
161 u32 flags, u32 noflags);
162
163 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
164 static void addrconf_dad_work(struct work_struct *w);
165 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
166 static void addrconf_dad_run(struct inet6_dev *idev);
167 static void addrconf_rs_timer(unsigned long data);
168 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
169 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170
171 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
172 struct prefix_info *pinfo);
173 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
174 struct net_device *dev);
175
176 static struct ipv6_devconf ipv6_devconf __read_mostly = {
177 .forwarding = 0,
178 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
179 .mtu6 = IPV6_MIN_MTU,
180 .accept_ra = 1,
181 .accept_redirects = 1,
182 .autoconf = 1,
183 .force_mld_version = 0,
184 .mldv1_unsolicited_report_interval = 10 * HZ,
185 .mldv2_unsolicited_report_interval = HZ,
186 .dad_transmits = 1,
187 .rtr_solicits = MAX_RTR_SOLICITATIONS,
188 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
189 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
190 .use_tempaddr = 0,
191 .temp_valid_lft = TEMP_VALID_LIFETIME,
192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
193 .regen_max_retry = REGEN_MAX_RETRY,
194 .max_desync_factor = MAX_DESYNC_FACTOR,
195 .max_addresses = IPV6_MAX_ADDRESSES,
196 .accept_ra_defrtr = 1,
197 .accept_ra_from_local = 0,
198 .accept_ra_pinfo = 1,
199 #ifdef CONFIG_IPV6_ROUTER_PREF
200 .accept_ra_rtr_pref = 1,
201 .rtr_probe_interval = 60 * HZ,
202 #ifdef CONFIG_IPV6_ROUTE_INFO
203 .accept_ra_rt_info_max_plen = 0,
204 #endif
205 #endif
206 .proxy_ndp = 0,
207 .accept_source_route = 0, /* we do not accept RH0 by default. */
208 .disable_ipv6 = 0,
209 .accept_dad = 1,
210 .suppress_frag_ndisc = 1,
211 .accept_ra_mtu = 1,
212 .stable_secret = {
213 .initialized = false,
214 }
215 };
216
217 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
218 .forwarding = 0,
219 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
220 .mtu6 = IPV6_MIN_MTU,
221 .accept_ra = 1,
222 .accept_redirects = 1,
223 .autoconf = 1,
224 .force_mld_version = 0,
225 .mldv1_unsolicited_report_interval = 10 * HZ,
226 .mldv2_unsolicited_report_interval = HZ,
227 .dad_transmits = 1,
228 .rtr_solicits = MAX_RTR_SOLICITATIONS,
229 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
230 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
231 .use_tempaddr = 0,
232 .temp_valid_lft = TEMP_VALID_LIFETIME,
233 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
234 .regen_max_retry = REGEN_MAX_RETRY,
235 .max_desync_factor = MAX_DESYNC_FACTOR,
236 .max_addresses = IPV6_MAX_ADDRESSES,
237 .accept_ra_defrtr = 1,
238 .accept_ra_from_local = 0,
239 .accept_ra_pinfo = 1,
240 #ifdef CONFIG_IPV6_ROUTER_PREF
241 .accept_ra_rtr_pref = 1,
242 .rtr_probe_interval = 60 * HZ,
243 #ifdef CONFIG_IPV6_ROUTE_INFO
244 .accept_ra_rt_info_max_plen = 0,
245 #endif
246 #endif
247 .proxy_ndp = 0,
248 .accept_source_route = 0, /* we do not accept RH0 by default. */
249 .disable_ipv6 = 0,
250 .accept_dad = 1,
251 .suppress_frag_ndisc = 1,
252 .accept_ra_mtu = 1,
253 .stable_secret = {
254 .initialized = false,
255 },
256 };
257
258 /* Check if a valid qdisc is available */
259 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
260 {
261 return !qdisc_tx_is_noop(dev);
262 }
263
264 static void addrconf_del_rs_timer(struct inet6_dev *idev)
265 {
266 if (del_timer(&idev->rs_timer))
267 __in6_dev_put(idev);
268 }
269
270 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
271 {
272 if (cancel_delayed_work(&ifp->dad_work))
273 __in6_ifa_put(ifp);
274 }
275
276 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
277 unsigned long when)
278 {
279 if (!timer_pending(&idev->rs_timer))
280 in6_dev_hold(idev);
281 mod_timer(&idev->rs_timer, jiffies + when);
282 }
283
284 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
285 unsigned long delay)
286 {
287 if (!delayed_work_pending(&ifp->dad_work))
288 in6_ifa_hold(ifp);
289 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
290 }
291
292 static int snmp6_alloc_dev(struct inet6_dev *idev)
293 {
294 int i;
295
296 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
297 if (!idev->stats.ipv6)
298 goto err_ip;
299
300 for_each_possible_cpu(i) {
301 struct ipstats_mib *addrconf_stats;
302 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
303 u64_stats_init(&addrconf_stats->syncp);
304 }
305
306
307 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
308 GFP_KERNEL);
309 if (!idev->stats.icmpv6dev)
310 goto err_icmp;
311 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
312 GFP_KERNEL);
313 if (!idev->stats.icmpv6msgdev)
314 goto err_icmpmsg;
315
316 return 0;
317
318 err_icmpmsg:
319 kfree(idev->stats.icmpv6dev);
320 err_icmp:
321 free_percpu(idev->stats.ipv6);
322 err_ip:
323 return -ENOMEM;
324 }
325
326 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
327 {
328 struct inet6_dev *ndev;
329 int err = -ENOMEM;
330
331 ASSERT_RTNL();
332
333 if (dev->mtu < IPV6_MIN_MTU)
334 return ERR_PTR(-EINVAL);
335
336 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
337 if (ndev == NULL)
338 return ERR_PTR(err);
339
340 rwlock_init(&ndev->lock);
341 ndev->dev = dev;
342 INIT_LIST_HEAD(&ndev->addr_list);
343 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
344 (unsigned long)ndev);
345 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
346 ndev->cnf.mtu6 = dev->mtu;
347 ndev->cnf.sysctl = NULL;
348 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
349 if (ndev->nd_parms == NULL) {
350 kfree(ndev);
351 return ERR_PTR(err);
352 }
353 if (ndev->cnf.forwarding)
354 dev_disable_lro(dev);
355 /* We refer to the device */
356 dev_hold(dev);
357
358 if (snmp6_alloc_dev(ndev) < 0) {
359 ADBG(KERN_WARNING
360 "%s: cannot allocate memory for statistics; dev=%s.\n",
361 __func__, dev->name);
362 neigh_parms_release(&nd_tbl, ndev->nd_parms);
363 dev_put(dev);
364 kfree(ndev);
365 return ERR_PTR(err);
366 }
367
368 if (snmp6_register_dev(ndev) < 0) {
369 ADBG(KERN_WARNING
370 "%s: cannot create /proc/net/dev_snmp6/%s\n",
371 __func__, dev->name);
372 goto err_release;
373 }
374
375 /* One reference from device. We must do this before
376 * we invoke __ipv6_regen_rndid().
377 */
378 in6_dev_hold(ndev);
379
380 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
381 ndev->cnf.accept_dad = -1;
382
383 #if IS_ENABLED(CONFIG_IPV6_SIT)
384 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
385 pr_info("%s: Disabled Multicast RS\n", dev->name);
386 ndev->cnf.rtr_solicits = 0;
387 }
388 #endif
389
390 INIT_LIST_HEAD(&ndev->tempaddr_list);
391 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
392 if ((dev->flags&IFF_LOOPBACK) ||
393 dev->type == ARPHRD_TUNNEL ||
394 dev->type == ARPHRD_TUNNEL6 ||
395 dev->type == ARPHRD_SIT ||
396 dev->type == ARPHRD_NONE) {
397 ndev->cnf.use_tempaddr = -1;
398 } else {
399 in6_dev_hold(ndev);
400 ipv6_regen_rndid((unsigned long) ndev);
401 }
402
403 ndev->token = in6addr_any;
404
405 if (netif_running(dev) && addrconf_qdisc_ok(dev))
406 ndev->if_flags |= IF_READY;
407
408 ipv6_mc_init_dev(ndev);
409 ndev->tstamp = jiffies;
410 err = addrconf_sysctl_register(ndev);
411 if (err) {
412 ipv6_mc_destroy_dev(ndev);
413 del_timer(&ndev->regen_timer);
414 goto err_release;
415 }
416 /* protected by rtnl_lock */
417 rcu_assign_pointer(dev->ip6_ptr, ndev);
418
419 /* Join interface-local all-node multicast group */
420 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
421
422 /* Join all-node multicast group */
423 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
424
425 /* Join all-router multicast group if forwarding is set */
426 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
427 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
428
429 return ndev;
430
431 err_release:
432 neigh_parms_release(&nd_tbl, ndev->nd_parms);
433 ndev->dead = 1;
434 in6_dev_finish_destroy(ndev);
435 return ERR_PTR(err);
436 }
437
438 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
439 {
440 struct inet6_dev *idev;
441
442 ASSERT_RTNL();
443
444 idev = __in6_dev_get(dev);
445 if (!idev) {
446 idev = ipv6_add_dev(dev);
447 if (IS_ERR(idev))
448 return NULL;
449 }
450
451 if (dev->flags&IFF_UP)
452 ipv6_mc_up(idev);
453 return idev;
454 }
455
456 static int inet6_netconf_msgsize_devconf(int type)
457 {
458 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
459 + nla_total_size(4); /* NETCONFA_IFINDEX */
460
461 /* type -1 is used for ALL */
462 if (type == -1 || type == NETCONFA_FORWARDING)
463 size += nla_total_size(4);
464 #ifdef CONFIG_IPV6_MROUTE
465 if (type == -1 || type == NETCONFA_MC_FORWARDING)
466 size += nla_total_size(4);
467 #endif
468 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
469 size += nla_total_size(4);
470
471 return size;
472 }
473
474 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
475 struct ipv6_devconf *devconf, u32 portid,
476 u32 seq, int event, unsigned int flags,
477 int type)
478 {
479 struct nlmsghdr *nlh;
480 struct netconfmsg *ncm;
481
482 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
483 flags);
484 if (nlh == NULL)
485 return -EMSGSIZE;
486
487 ncm = nlmsg_data(nlh);
488 ncm->ncm_family = AF_INET6;
489
490 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
491 goto nla_put_failure;
492
493 /* type -1 is used for ALL */
494 if ((type == -1 || type == NETCONFA_FORWARDING) &&
495 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
496 goto nla_put_failure;
497 #ifdef CONFIG_IPV6_MROUTE
498 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
499 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
500 devconf->mc_forwarding) < 0)
501 goto nla_put_failure;
502 #endif
503 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
504 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
505 goto nla_put_failure;
506
507 nlmsg_end(skb, nlh);
508 return 0;
509
510 nla_put_failure:
511 nlmsg_cancel(skb, nlh);
512 return -EMSGSIZE;
513 }
514
515 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
516 struct ipv6_devconf *devconf)
517 {
518 struct sk_buff *skb;
519 int err = -ENOBUFS;
520
521 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
522 if (skb == NULL)
523 goto errout;
524
525 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
526 RTM_NEWNETCONF, 0, type);
527 if (err < 0) {
528 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
529 WARN_ON(err == -EMSGSIZE);
530 kfree_skb(skb);
531 goto errout;
532 }
533 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
534 return;
535 errout:
536 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
537 }
538
539 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
540 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
541 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
542 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
543 };
544
545 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
546 struct nlmsghdr *nlh)
547 {
548 struct net *net = sock_net(in_skb->sk);
549 struct nlattr *tb[NETCONFA_MAX+1];
550 struct netconfmsg *ncm;
551 struct sk_buff *skb;
552 struct ipv6_devconf *devconf;
553 struct inet6_dev *in6_dev;
554 struct net_device *dev;
555 int ifindex;
556 int err;
557
558 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
559 devconf_ipv6_policy);
560 if (err < 0)
561 goto errout;
562
563 err = EINVAL;
564 if (!tb[NETCONFA_IFINDEX])
565 goto errout;
566
567 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
568 switch (ifindex) {
569 case NETCONFA_IFINDEX_ALL:
570 devconf = net->ipv6.devconf_all;
571 break;
572 case NETCONFA_IFINDEX_DEFAULT:
573 devconf = net->ipv6.devconf_dflt;
574 break;
575 default:
576 dev = __dev_get_by_index(net, ifindex);
577 if (dev == NULL)
578 goto errout;
579 in6_dev = __in6_dev_get(dev);
580 if (in6_dev == NULL)
581 goto errout;
582 devconf = &in6_dev->cnf;
583 break;
584 }
585
586 err = -ENOBUFS;
587 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
588 if (skb == NULL)
589 goto errout;
590
591 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
592 NETLINK_CB(in_skb).portid,
593 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
594 -1);
595 if (err < 0) {
596 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
597 WARN_ON(err == -EMSGSIZE);
598 kfree_skb(skb);
599 goto errout;
600 }
601 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
602 errout:
603 return err;
604 }
605
606 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
607 struct netlink_callback *cb)
608 {
609 struct net *net = sock_net(skb->sk);
610 int h, s_h;
611 int idx, s_idx;
612 struct net_device *dev;
613 struct inet6_dev *idev;
614 struct hlist_head *head;
615
616 s_h = cb->args[0];
617 s_idx = idx = cb->args[1];
618
619 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
620 idx = 0;
621 head = &net->dev_index_head[h];
622 rcu_read_lock();
623 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
624 net->dev_base_seq;
625 hlist_for_each_entry_rcu(dev, head, index_hlist) {
626 if (idx < s_idx)
627 goto cont;
628 idev = __in6_dev_get(dev);
629 if (!idev)
630 goto cont;
631
632 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
633 &idev->cnf,
634 NETLINK_CB(cb->skb).portid,
635 cb->nlh->nlmsg_seq,
636 RTM_NEWNETCONF,
637 NLM_F_MULTI,
638 -1) < 0) {
639 rcu_read_unlock();
640 goto done;
641 }
642 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
643 cont:
644 idx++;
645 }
646 rcu_read_unlock();
647 }
648 if (h == NETDEV_HASHENTRIES) {
649 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
650 net->ipv6.devconf_all,
651 NETLINK_CB(cb->skb).portid,
652 cb->nlh->nlmsg_seq,
653 RTM_NEWNETCONF, NLM_F_MULTI,
654 -1) < 0)
655 goto done;
656 else
657 h++;
658 }
659 if (h == NETDEV_HASHENTRIES + 1) {
660 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
661 net->ipv6.devconf_dflt,
662 NETLINK_CB(cb->skb).portid,
663 cb->nlh->nlmsg_seq,
664 RTM_NEWNETCONF, NLM_F_MULTI,
665 -1) < 0)
666 goto done;
667 else
668 h++;
669 }
670 done:
671 cb->args[0] = h;
672 cb->args[1] = idx;
673
674 return skb->len;
675 }
676
677 #ifdef CONFIG_SYSCTL
678 static void dev_forward_change(struct inet6_dev *idev)
679 {
680 struct net_device *dev;
681 struct inet6_ifaddr *ifa;
682
683 if (!idev)
684 return;
685 dev = idev->dev;
686 if (idev->cnf.forwarding)
687 dev_disable_lro(dev);
688 if (dev->flags & IFF_MULTICAST) {
689 if (idev->cnf.forwarding) {
690 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
691 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
692 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
693 } else {
694 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
695 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
696 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
697 }
698 }
699
700 list_for_each_entry(ifa, &idev->addr_list, if_list) {
701 if (ifa->flags&IFA_F_TENTATIVE)
702 continue;
703 if (idev->cnf.forwarding)
704 addrconf_join_anycast(ifa);
705 else
706 addrconf_leave_anycast(ifa);
707 }
708 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
709 dev->ifindex, &idev->cnf);
710 }
711
712
713 static void addrconf_forward_change(struct net *net, __s32 newf)
714 {
715 struct net_device *dev;
716 struct inet6_dev *idev;
717
718 for_each_netdev(net, dev) {
719 idev = __in6_dev_get(dev);
720 if (idev) {
721 int changed = (!idev->cnf.forwarding) ^ (!newf);
722 idev->cnf.forwarding = newf;
723 if (changed)
724 dev_forward_change(idev);
725 }
726 }
727 }
728
729 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
730 {
731 struct net *net;
732 int old;
733
734 if (!rtnl_trylock())
735 return restart_syscall();
736
737 net = (struct net *)table->extra2;
738 old = *p;
739 *p = newf;
740
741 if (p == &net->ipv6.devconf_dflt->forwarding) {
742 if ((!newf) ^ (!old))
743 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
744 NETCONFA_IFINDEX_DEFAULT,
745 net->ipv6.devconf_dflt);
746 rtnl_unlock();
747 return 0;
748 }
749
750 if (p == &net->ipv6.devconf_all->forwarding) {
751 net->ipv6.devconf_dflt->forwarding = newf;
752 addrconf_forward_change(net, newf);
753 if ((!newf) ^ (!old))
754 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
755 NETCONFA_IFINDEX_ALL,
756 net->ipv6.devconf_all);
757 } else if ((!newf) ^ (!old))
758 dev_forward_change((struct inet6_dev *)table->extra1);
759 rtnl_unlock();
760
761 if (newf)
762 rt6_purge_dflt_routers(net);
763 return 1;
764 }
765 #endif
766
767 /* Nobody refers to this ifaddr, destroy it */
768 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
769 {
770 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
771
772 #ifdef NET_REFCNT_DEBUG
773 pr_debug("%s\n", __func__);
774 #endif
775
776 in6_dev_put(ifp->idev);
777
778 if (cancel_delayed_work(&ifp->dad_work))
779 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
780 ifp);
781
782 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
783 pr_warn("Freeing alive inet6 address %p\n", ifp);
784 return;
785 }
786 ip6_rt_put(ifp->rt);
787
788 kfree_rcu(ifp, rcu);
789 }
790
791 static void
792 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
793 {
794 struct list_head *p;
795 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
796
797 /*
798 * Each device address list is sorted in order of scope -
799 * global before linklocal.
800 */
801 list_for_each(p, &idev->addr_list) {
802 struct inet6_ifaddr *ifa
803 = list_entry(p, struct inet6_ifaddr, if_list);
804 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
805 break;
806 }
807
808 list_add_tail(&ifp->if_list, p);
809 }
810
811 static u32 inet6_addr_hash(const struct in6_addr *addr)
812 {
813 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
814 }
815
816 /* On success it returns ifp with increased reference count */
817
818 static struct inet6_ifaddr *
819 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
820 const struct in6_addr *peer_addr, int pfxlen,
821 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
822 {
823 struct inet6_ifaddr *ifa = NULL;
824 struct rt6_info *rt;
825 unsigned int hash;
826 int err = 0;
827 int addr_type = ipv6_addr_type(addr);
828
829 if (addr_type == IPV6_ADDR_ANY ||
830 addr_type & IPV6_ADDR_MULTICAST ||
831 (!(idev->dev->flags & IFF_LOOPBACK) &&
832 addr_type & IPV6_ADDR_LOOPBACK))
833 return ERR_PTR(-EADDRNOTAVAIL);
834
835 rcu_read_lock_bh();
836 if (idev->dead) {
837 err = -ENODEV; /*XXX*/
838 goto out2;
839 }
840
841 if (idev->cnf.disable_ipv6) {
842 err = -EACCES;
843 goto out2;
844 }
845
846 spin_lock(&addrconf_hash_lock);
847
848 /* Ignore adding duplicate addresses on an interface */
849 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
850 ADBG("ipv6_add_addr: already assigned\n");
851 err = -EEXIST;
852 goto out;
853 }
854
855 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
856
857 if (ifa == NULL) {
858 ADBG("ipv6_add_addr: malloc failed\n");
859 err = -ENOBUFS;
860 goto out;
861 }
862
863 rt = addrconf_dst_alloc(idev, addr, false);
864 if (IS_ERR(rt)) {
865 err = PTR_ERR(rt);
866 goto out;
867 }
868
869 neigh_parms_data_state_setall(idev->nd_parms);
870
871 ifa->addr = *addr;
872 if (peer_addr)
873 ifa->peer_addr = *peer_addr;
874
875 spin_lock_init(&ifa->lock);
876 spin_lock_init(&ifa->state_lock);
877 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
878 INIT_HLIST_NODE(&ifa->addr_lst);
879 ifa->scope = scope;
880 ifa->prefix_len = pfxlen;
881 ifa->flags = flags | IFA_F_TENTATIVE;
882 ifa->valid_lft = valid_lft;
883 ifa->prefered_lft = prefered_lft;
884 ifa->cstamp = ifa->tstamp = jiffies;
885 ifa->tokenized = false;
886
887 ifa->rt = rt;
888
889 ifa->idev = idev;
890 in6_dev_hold(idev);
891 /* For caller */
892 in6_ifa_hold(ifa);
893
894 /* Add to big hash table */
895 hash = inet6_addr_hash(addr);
896
897 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
898 spin_unlock(&addrconf_hash_lock);
899
900 write_lock(&idev->lock);
901 /* Add to inet6_dev unicast addr list. */
902 ipv6_link_dev_addr(idev, ifa);
903
904 if (ifa->flags&IFA_F_TEMPORARY) {
905 list_add(&ifa->tmp_list, &idev->tempaddr_list);
906 in6_ifa_hold(ifa);
907 }
908
909 in6_ifa_hold(ifa);
910 write_unlock(&idev->lock);
911 out2:
912 rcu_read_unlock_bh();
913
914 if (likely(err == 0))
915 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
916 else {
917 kfree(ifa);
918 ifa = ERR_PTR(err);
919 }
920
921 return ifa;
922 out:
923 spin_unlock(&addrconf_hash_lock);
924 goto out2;
925 }
926
927 enum cleanup_prefix_rt_t {
928 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
929 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
930 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
931 };
932
933 /*
934 * Check, whether the prefix for ifp would still need a prefix route
935 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
936 * constants.
937 *
938 * 1) we don't purge prefix if address was not permanent.
939 * prefix is managed by its own lifetime.
940 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
941 * 3) if there are no addresses, delete prefix.
942 * 4) if there are still other permanent address(es),
943 * corresponding prefix is still permanent.
944 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
945 * don't purge the prefix, assume user space is managing it.
946 * 6) otherwise, update prefix lifetime to the
947 * longest valid lifetime among the corresponding
948 * addresses on the device.
949 * Note: subsequent RA will update lifetime.
950 **/
951 static enum cleanup_prefix_rt_t
952 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
953 {
954 struct inet6_ifaddr *ifa;
955 struct inet6_dev *idev = ifp->idev;
956 unsigned long lifetime;
957 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
958
959 *expires = jiffies;
960
961 list_for_each_entry(ifa, &idev->addr_list, if_list) {
962 if (ifa == ifp)
963 continue;
964 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
965 ifp->prefix_len))
966 continue;
967 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
968 return CLEANUP_PREFIX_RT_NOP;
969
970 action = CLEANUP_PREFIX_RT_EXPIRE;
971
972 spin_lock(&ifa->lock);
973
974 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
975 /*
976 * Note: Because this address is
977 * not permanent, lifetime <
978 * LONG_MAX / HZ here.
979 */
980 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
981 *expires = ifa->tstamp + lifetime * HZ;
982 spin_unlock(&ifa->lock);
983 }
984
985 return action;
986 }
987
988 static void
989 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
990 {
991 struct rt6_info *rt;
992
993 rt = addrconf_get_prefix_route(&ifp->addr,
994 ifp->prefix_len,
995 ifp->idev->dev,
996 0, RTF_GATEWAY | RTF_DEFAULT);
997 if (rt) {
998 if (del_rt)
999 ip6_del_rt(rt);
1000 else {
1001 if (!(rt->rt6i_flags & RTF_EXPIRES))
1002 rt6_set_expires(rt, expires);
1003 ip6_rt_put(rt);
1004 }
1005 }
1006 }
1007
1008
1009 /* This function wants to get referenced ifp and releases it before return */
1010
1011 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1012 {
1013 int state;
1014 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1015 unsigned long expires;
1016
1017 ASSERT_RTNL();
1018
1019 spin_lock_bh(&ifp->state_lock);
1020 state = ifp->state;
1021 ifp->state = INET6_IFADDR_STATE_DEAD;
1022 spin_unlock_bh(&ifp->state_lock);
1023
1024 if (state == INET6_IFADDR_STATE_DEAD)
1025 goto out;
1026
1027 spin_lock_bh(&addrconf_hash_lock);
1028 hlist_del_init_rcu(&ifp->addr_lst);
1029 spin_unlock_bh(&addrconf_hash_lock);
1030
1031 write_lock_bh(&ifp->idev->lock);
1032
1033 if (ifp->flags&IFA_F_TEMPORARY) {
1034 list_del(&ifp->tmp_list);
1035 if (ifp->ifpub) {
1036 in6_ifa_put(ifp->ifpub);
1037 ifp->ifpub = NULL;
1038 }
1039 __in6_ifa_put(ifp);
1040 }
1041
1042 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1043 action = check_cleanup_prefix_route(ifp, &expires);
1044
1045 list_del_init(&ifp->if_list);
1046 __in6_ifa_put(ifp);
1047
1048 write_unlock_bh(&ifp->idev->lock);
1049
1050 addrconf_del_dad_work(ifp);
1051
1052 ipv6_ifa_notify(RTM_DELADDR, ifp);
1053
1054 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1055
1056 if (action != CLEANUP_PREFIX_RT_NOP) {
1057 cleanup_prefix_route(ifp, expires,
1058 action == CLEANUP_PREFIX_RT_DEL);
1059 }
1060
1061 /* clean up prefsrc entries */
1062 rt6_remove_prefsrc(ifp);
1063 out:
1064 in6_ifa_put(ifp);
1065 }
1066
1067 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1068 {
1069 struct inet6_dev *idev = ifp->idev;
1070 struct in6_addr addr, *tmpaddr;
1071 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1072 unsigned long regen_advance;
1073 int tmp_plen;
1074 int ret = 0;
1075 u32 addr_flags;
1076 unsigned long now = jiffies;
1077
1078 write_lock_bh(&idev->lock);
1079 if (ift) {
1080 spin_lock_bh(&ift->lock);
1081 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1082 spin_unlock_bh(&ift->lock);
1083 tmpaddr = &addr;
1084 } else {
1085 tmpaddr = NULL;
1086 }
1087 retry:
1088 in6_dev_hold(idev);
1089 if (idev->cnf.use_tempaddr <= 0) {
1090 write_unlock_bh(&idev->lock);
1091 pr_info("%s: use_tempaddr is disabled\n", __func__);
1092 in6_dev_put(idev);
1093 ret = -1;
1094 goto out;
1095 }
1096 spin_lock_bh(&ifp->lock);
1097 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1098 idev->cnf.use_tempaddr = -1; /*XXX*/
1099 spin_unlock_bh(&ifp->lock);
1100 write_unlock_bh(&idev->lock);
1101 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1102 __func__);
1103 in6_dev_put(idev);
1104 ret = -1;
1105 goto out;
1106 }
1107 in6_ifa_hold(ifp);
1108 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1109 __ipv6_try_regen_rndid(idev, tmpaddr);
1110 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1111 age = (now - ifp->tstamp) / HZ;
1112 tmp_valid_lft = min_t(__u32,
1113 ifp->valid_lft,
1114 idev->cnf.temp_valid_lft + age);
1115 tmp_prefered_lft = min_t(__u32,
1116 ifp->prefered_lft,
1117 idev->cnf.temp_prefered_lft + age -
1118 idev->cnf.max_desync_factor);
1119 tmp_plen = ifp->prefix_len;
1120 tmp_tstamp = ifp->tstamp;
1121 spin_unlock_bh(&ifp->lock);
1122
1123 regen_advance = idev->cnf.regen_max_retry *
1124 idev->cnf.dad_transmits *
1125 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1126 write_unlock_bh(&idev->lock);
1127
1128 /* A temporary address is created only if this calculated Preferred
1129 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1130 * an implementation must not create a temporary address with a zero
1131 * Preferred Lifetime.
1132 * Use age calculation as in addrconf_verify to avoid unnecessary
1133 * temporary addresses being generated.
1134 */
1135 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1136 if (tmp_prefered_lft <= regen_advance + age) {
1137 in6_ifa_put(ifp);
1138 in6_dev_put(idev);
1139 ret = -1;
1140 goto out;
1141 }
1142
1143 addr_flags = IFA_F_TEMPORARY;
1144 /* set in addrconf_prefix_rcv() */
1145 if (ifp->flags & IFA_F_OPTIMISTIC)
1146 addr_flags |= IFA_F_OPTIMISTIC;
1147
1148 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1149 ipv6_addr_scope(&addr), addr_flags,
1150 tmp_valid_lft, tmp_prefered_lft);
1151 if (IS_ERR(ift)) {
1152 in6_ifa_put(ifp);
1153 in6_dev_put(idev);
1154 pr_info("%s: retry temporary address regeneration\n", __func__);
1155 tmpaddr = &addr;
1156 write_lock_bh(&idev->lock);
1157 goto retry;
1158 }
1159
1160 spin_lock_bh(&ift->lock);
1161 ift->ifpub = ifp;
1162 ift->cstamp = now;
1163 ift->tstamp = tmp_tstamp;
1164 spin_unlock_bh(&ift->lock);
1165
1166 addrconf_dad_start(ift);
1167 in6_ifa_put(ift);
1168 in6_dev_put(idev);
1169 out:
1170 return ret;
1171 }
1172
1173 /*
1174 * Choose an appropriate source address (RFC3484)
1175 */
1176 enum {
1177 IPV6_SADDR_RULE_INIT = 0,
1178 IPV6_SADDR_RULE_LOCAL,
1179 IPV6_SADDR_RULE_SCOPE,
1180 IPV6_SADDR_RULE_PREFERRED,
1181 #ifdef CONFIG_IPV6_MIP6
1182 IPV6_SADDR_RULE_HOA,
1183 #endif
1184 IPV6_SADDR_RULE_OIF,
1185 IPV6_SADDR_RULE_LABEL,
1186 IPV6_SADDR_RULE_PRIVACY,
1187 IPV6_SADDR_RULE_ORCHID,
1188 IPV6_SADDR_RULE_PREFIX,
1189 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1190 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1191 #endif
1192 IPV6_SADDR_RULE_MAX
1193 };
1194
1195 struct ipv6_saddr_score {
1196 int rule;
1197 int addr_type;
1198 struct inet6_ifaddr *ifa;
1199 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1200 int scopedist;
1201 int matchlen;
1202 };
1203
1204 struct ipv6_saddr_dst {
1205 const struct in6_addr *addr;
1206 int ifindex;
1207 int scope;
1208 int label;
1209 unsigned int prefs;
1210 };
1211
1212 static inline int ipv6_saddr_preferred(int type)
1213 {
1214 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1215 return 1;
1216 return 0;
1217 }
1218
1219 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1220 {
1221 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1222 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1223 #else
1224 return false;
1225 #endif
1226 }
1227
1228 static int ipv6_get_saddr_eval(struct net *net,
1229 struct ipv6_saddr_score *score,
1230 struct ipv6_saddr_dst *dst,
1231 int i)
1232 {
1233 int ret;
1234
1235 if (i <= score->rule) {
1236 switch (i) {
1237 case IPV6_SADDR_RULE_SCOPE:
1238 ret = score->scopedist;
1239 break;
1240 case IPV6_SADDR_RULE_PREFIX:
1241 ret = score->matchlen;
1242 break;
1243 default:
1244 ret = !!test_bit(i, score->scorebits);
1245 }
1246 goto out;
1247 }
1248
1249 switch (i) {
1250 case IPV6_SADDR_RULE_INIT:
1251 /* Rule 0: remember if hiscore is not ready yet */
1252 ret = !!score->ifa;
1253 break;
1254 case IPV6_SADDR_RULE_LOCAL:
1255 /* Rule 1: Prefer same address */
1256 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1257 break;
1258 case IPV6_SADDR_RULE_SCOPE:
1259 /* Rule 2: Prefer appropriate scope
1260 *
1261 * ret
1262 * ^
1263 * -1 | d 15
1264 * ---+--+-+---> scope
1265 * |
1266 * | d is scope of the destination.
1267 * B-d | \
1268 * | \ <- smaller scope is better if
1269 * B-15 | \ if scope is enough for destination.
1270 * | ret = B - scope (-1 <= scope >= d <= 15).
1271 * d-C-1 | /
1272 * |/ <- greater is better
1273 * -C / if scope is not enough for destination.
1274 * /| ret = scope - C (-1 <= d < scope <= 15).
1275 *
1276 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1277 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1278 * Assume B = 0 and we get C > 29.
1279 */
1280 ret = __ipv6_addr_src_scope(score->addr_type);
1281 if (ret >= dst->scope)
1282 ret = -ret;
1283 else
1284 ret -= 128; /* 30 is enough */
1285 score->scopedist = ret;
1286 break;
1287 case IPV6_SADDR_RULE_PREFERRED:
1288 {
1289 /* Rule 3: Avoid deprecated and optimistic addresses */
1290 u8 avoid = IFA_F_DEPRECATED;
1291
1292 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1293 avoid |= IFA_F_OPTIMISTIC;
1294 ret = ipv6_saddr_preferred(score->addr_type) ||
1295 !(score->ifa->flags & avoid);
1296 break;
1297 }
1298 #ifdef CONFIG_IPV6_MIP6
1299 case IPV6_SADDR_RULE_HOA:
1300 {
1301 /* Rule 4: Prefer home address */
1302 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1303 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1304 break;
1305 }
1306 #endif
1307 case IPV6_SADDR_RULE_OIF:
1308 /* Rule 5: Prefer outgoing interface */
1309 ret = (!dst->ifindex ||
1310 dst->ifindex == score->ifa->idev->dev->ifindex);
1311 break;
1312 case IPV6_SADDR_RULE_LABEL:
1313 /* Rule 6: Prefer matching label */
1314 ret = ipv6_addr_label(net,
1315 &score->ifa->addr, score->addr_type,
1316 score->ifa->idev->dev->ifindex) == dst->label;
1317 break;
1318 case IPV6_SADDR_RULE_PRIVACY:
1319 {
1320 /* Rule 7: Prefer public address
1321 * Note: prefer temporary address if use_tempaddr >= 2
1322 */
1323 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1324 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1325 score->ifa->idev->cnf.use_tempaddr >= 2;
1326 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1327 break;
1328 }
1329 case IPV6_SADDR_RULE_ORCHID:
1330 /* Rule 8-: Prefer ORCHID vs ORCHID or
1331 * non-ORCHID vs non-ORCHID
1332 */
1333 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1334 ipv6_addr_orchid(dst->addr));
1335 break;
1336 case IPV6_SADDR_RULE_PREFIX:
1337 /* Rule 8: Use longest matching prefix */
1338 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1339 if (ret > score->ifa->prefix_len)
1340 ret = score->ifa->prefix_len;
1341 score->matchlen = ret;
1342 break;
1343 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1344 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1345 /* Optimistic addresses still have lower precedence than other
1346 * preferred addresses.
1347 */
1348 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1349 break;
1350 #endif
1351 default:
1352 ret = 0;
1353 }
1354
1355 if (ret)
1356 __set_bit(i, score->scorebits);
1357 score->rule = i;
1358 out:
1359 return ret;
1360 }
1361
1362 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1363 const struct in6_addr *daddr, unsigned int prefs,
1364 struct in6_addr *saddr)
1365 {
1366 struct ipv6_saddr_score scores[2],
1367 *score = &scores[0], *hiscore = &scores[1];
1368 struct ipv6_saddr_dst dst;
1369 struct net_device *dev;
1370 int dst_type;
1371
1372 dst_type = __ipv6_addr_type(daddr);
1373 dst.addr = daddr;
1374 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1375 dst.scope = __ipv6_addr_src_scope(dst_type);
1376 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1377 dst.prefs = prefs;
1378
1379 hiscore->rule = -1;
1380 hiscore->ifa = NULL;
1381
1382 rcu_read_lock();
1383
1384 for_each_netdev_rcu(net, dev) {
1385 struct inet6_dev *idev;
1386
1387 /* Candidate Source Address (section 4)
1388 * - multicast and link-local destination address,
1389 * the set of candidate source address MUST only
1390 * include addresses assigned to interfaces
1391 * belonging to the same link as the outgoing
1392 * interface.
1393 * (- For site-local destination addresses, the
1394 * set of candidate source addresses MUST only
1395 * include addresses assigned to interfaces
1396 * belonging to the same site as the outgoing
1397 * interface.)
1398 */
1399 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1400 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1401 dst.ifindex && dev->ifindex != dst.ifindex)
1402 continue;
1403
1404 idev = __in6_dev_get(dev);
1405 if (!idev)
1406 continue;
1407
1408 read_lock_bh(&idev->lock);
1409 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1410 int i;
1411
1412 /*
1413 * - Tentative Address (RFC2462 section 5.4)
1414 * - A tentative address is not considered
1415 * "assigned to an interface" in the traditional
1416 * sense, unless it is also flagged as optimistic.
1417 * - Candidate Source Address (section 4)
1418 * - In any case, anycast addresses, multicast
1419 * addresses, and the unspecified address MUST
1420 * NOT be included in a candidate set.
1421 */
1422 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1423 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1424 continue;
1425
1426 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1427
1428 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1429 score->addr_type & IPV6_ADDR_MULTICAST)) {
1430 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1431 dev->name);
1432 continue;
1433 }
1434
1435 score->rule = -1;
1436 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1437
1438 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1439 int minihiscore, miniscore;
1440
1441 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1442 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1443
1444 if (minihiscore > miniscore) {
1445 if (i == IPV6_SADDR_RULE_SCOPE &&
1446 score->scopedist > 0) {
1447 /*
1448 * special case:
1449 * each remaining entry
1450 * has too small (not enough)
1451 * scope, because ifa entries
1452 * are sorted by their scope
1453 * values.
1454 */
1455 goto try_nextdev;
1456 }
1457 break;
1458 } else if (minihiscore < miniscore) {
1459 if (hiscore->ifa)
1460 in6_ifa_put(hiscore->ifa);
1461
1462 in6_ifa_hold(score->ifa);
1463
1464 swap(hiscore, score);
1465
1466 /* restore our iterator */
1467 score->ifa = hiscore->ifa;
1468
1469 break;
1470 }
1471 }
1472 }
1473 try_nextdev:
1474 read_unlock_bh(&idev->lock);
1475 }
1476 rcu_read_unlock();
1477
1478 if (!hiscore->ifa)
1479 return -EADDRNOTAVAIL;
1480
1481 *saddr = hiscore->ifa->addr;
1482 in6_ifa_put(hiscore->ifa);
1483 return 0;
1484 }
1485 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1486
1487 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1488 u32 banned_flags)
1489 {
1490 struct inet6_ifaddr *ifp;
1491 int err = -EADDRNOTAVAIL;
1492
1493 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1494 if (ifp->scope > IFA_LINK)
1495 break;
1496 if (ifp->scope == IFA_LINK &&
1497 !(ifp->flags & banned_flags)) {
1498 *addr = ifp->addr;
1499 err = 0;
1500 break;
1501 }
1502 }
1503 return err;
1504 }
1505
1506 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1507 u32 banned_flags)
1508 {
1509 struct inet6_dev *idev;
1510 int err = -EADDRNOTAVAIL;
1511
1512 rcu_read_lock();
1513 idev = __in6_dev_get(dev);
1514 if (idev) {
1515 read_lock_bh(&idev->lock);
1516 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1517 read_unlock_bh(&idev->lock);
1518 }
1519 rcu_read_unlock();
1520 return err;
1521 }
1522
1523 static int ipv6_count_addresses(struct inet6_dev *idev)
1524 {
1525 int cnt = 0;
1526 struct inet6_ifaddr *ifp;
1527
1528 read_lock_bh(&idev->lock);
1529 list_for_each_entry(ifp, &idev->addr_list, if_list)
1530 cnt++;
1531 read_unlock_bh(&idev->lock);
1532 return cnt;
1533 }
1534
1535 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1536 const struct net_device *dev, int strict)
1537 {
1538 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1539 }
1540 EXPORT_SYMBOL(ipv6_chk_addr);
1541
1542 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1543 const struct net_device *dev, int strict,
1544 u32 banned_flags)
1545 {
1546 struct inet6_ifaddr *ifp;
1547 unsigned int hash = inet6_addr_hash(addr);
1548 u32 ifp_flags;
1549
1550 rcu_read_lock_bh();
1551 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1552 if (!net_eq(dev_net(ifp->idev->dev), net))
1553 continue;
1554 /* Decouple optimistic from tentative for evaluation here.
1555 * Ban optimistic addresses explicitly, when required.
1556 */
1557 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1558 ? (ifp->flags&~IFA_F_TENTATIVE)
1559 : ifp->flags;
1560 if (ipv6_addr_equal(&ifp->addr, addr) &&
1561 !(ifp_flags&banned_flags) &&
1562 (dev == NULL || ifp->idev->dev == dev ||
1563 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1564 rcu_read_unlock_bh();
1565 return 1;
1566 }
1567 }
1568
1569 rcu_read_unlock_bh();
1570 return 0;
1571 }
1572 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1573
1574 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1575 struct net_device *dev)
1576 {
1577 unsigned int hash = inet6_addr_hash(addr);
1578 struct inet6_ifaddr *ifp;
1579
1580 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1581 if (!net_eq(dev_net(ifp->idev->dev), net))
1582 continue;
1583 if (ipv6_addr_equal(&ifp->addr, addr)) {
1584 if (dev == NULL || ifp->idev->dev == dev)
1585 return true;
1586 }
1587 }
1588 return false;
1589 }
1590
1591 /* Compares an address/prefix_len with addresses on device @dev.
1592 * If one is found it returns true.
1593 */
1594 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1595 const unsigned int prefix_len, struct net_device *dev)
1596 {
1597 struct inet6_dev *idev;
1598 struct inet6_ifaddr *ifa;
1599 bool ret = false;
1600
1601 rcu_read_lock();
1602 idev = __in6_dev_get(dev);
1603 if (idev) {
1604 read_lock_bh(&idev->lock);
1605 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1606 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1607 if (ret)
1608 break;
1609 }
1610 read_unlock_bh(&idev->lock);
1611 }
1612 rcu_read_unlock();
1613
1614 return ret;
1615 }
1616 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1617
1618 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1619 {
1620 struct inet6_dev *idev;
1621 struct inet6_ifaddr *ifa;
1622 int onlink;
1623
1624 onlink = 0;
1625 rcu_read_lock();
1626 idev = __in6_dev_get(dev);
1627 if (idev) {
1628 read_lock_bh(&idev->lock);
1629 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1630 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1631 ifa->prefix_len);
1632 if (onlink)
1633 break;
1634 }
1635 read_unlock_bh(&idev->lock);
1636 }
1637 rcu_read_unlock();
1638 return onlink;
1639 }
1640 EXPORT_SYMBOL(ipv6_chk_prefix);
1641
1642 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1643 struct net_device *dev, int strict)
1644 {
1645 struct inet6_ifaddr *ifp, *result = NULL;
1646 unsigned int hash = inet6_addr_hash(addr);
1647
1648 rcu_read_lock_bh();
1649 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1650 if (!net_eq(dev_net(ifp->idev->dev), net))
1651 continue;
1652 if (ipv6_addr_equal(&ifp->addr, addr)) {
1653 if (dev == NULL || ifp->idev->dev == dev ||
1654 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1655 result = ifp;
1656 in6_ifa_hold(ifp);
1657 break;
1658 }
1659 }
1660 }
1661 rcu_read_unlock_bh();
1662
1663 return result;
1664 }
1665
1666 /* Gets referenced address, destroys ifaddr */
1667
1668 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1669 {
1670 if (ifp->flags&IFA_F_PERMANENT) {
1671 spin_lock_bh(&ifp->lock);
1672 addrconf_del_dad_work(ifp);
1673 ifp->flags |= IFA_F_TENTATIVE;
1674 if (dad_failed)
1675 ifp->flags |= IFA_F_DADFAILED;
1676 spin_unlock_bh(&ifp->lock);
1677 if (dad_failed)
1678 ipv6_ifa_notify(0, ifp);
1679 in6_ifa_put(ifp);
1680 } else if (ifp->flags&IFA_F_TEMPORARY) {
1681 struct inet6_ifaddr *ifpub;
1682 spin_lock_bh(&ifp->lock);
1683 ifpub = ifp->ifpub;
1684 if (ifpub) {
1685 in6_ifa_hold(ifpub);
1686 spin_unlock_bh(&ifp->lock);
1687 ipv6_create_tempaddr(ifpub, ifp);
1688 in6_ifa_put(ifpub);
1689 } else {
1690 spin_unlock_bh(&ifp->lock);
1691 }
1692 ipv6_del_addr(ifp);
1693 } else {
1694 ipv6_del_addr(ifp);
1695 }
1696 }
1697
1698 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1699 {
1700 int err = -ENOENT;
1701
1702 spin_lock_bh(&ifp->state_lock);
1703 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1704 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1705 err = 0;
1706 }
1707 spin_unlock_bh(&ifp->state_lock);
1708
1709 return err;
1710 }
1711
1712 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1713 {
1714 struct inet6_dev *idev = ifp->idev;
1715
1716 if (addrconf_dad_end(ifp)) {
1717 in6_ifa_put(ifp);
1718 return;
1719 }
1720
1721 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1722 ifp->idev->dev->name, &ifp->addr);
1723
1724 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1725 struct in6_addr addr;
1726
1727 addr.s6_addr32[0] = htonl(0xfe800000);
1728 addr.s6_addr32[1] = 0;
1729
1730 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1731 ipv6_addr_equal(&ifp->addr, &addr)) {
1732 /* DAD failed for link-local based on MAC address */
1733 idev->cnf.disable_ipv6 = 1;
1734
1735 pr_info("%s: IPv6 being disabled!\n",
1736 ifp->idev->dev->name);
1737 }
1738 }
1739
1740 spin_lock_bh(&ifp->state_lock);
1741 /* transition from _POSTDAD to _ERRDAD */
1742 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1743 spin_unlock_bh(&ifp->state_lock);
1744
1745 addrconf_mod_dad_work(ifp, 0);
1746 }
1747
1748 /* Join to solicited addr multicast group.
1749 * caller must hold RTNL */
1750 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1751 {
1752 struct in6_addr maddr;
1753
1754 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1755 return;
1756
1757 addrconf_addr_solict_mult(addr, &maddr);
1758 ipv6_dev_mc_inc(dev, &maddr);
1759 }
1760
1761 /* caller must hold RTNL */
1762 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1763 {
1764 struct in6_addr maddr;
1765
1766 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1767 return;
1768
1769 addrconf_addr_solict_mult(addr, &maddr);
1770 __ipv6_dev_mc_dec(idev, &maddr);
1771 }
1772
1773 /* caller must hold RTNL */
1774 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1775 {
1776 struct in6_addr addr;
1777
1778 if (ifp->prefix_len >= 127) /* RFC 6164 */
1779 return;
1780 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1781 if (ipv6_addr_any(&addr))
1782 return;
1783 __ipv6_dev_ac_inc(ifp->idev, &addr);
1784 }
1785
1786 /* caller must hold RTNL */
1787 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1788 {
1789 struct in6_addr addr;
1790
1791 if (ifp->prefix_len >= 127) /* RFC 6164 */
1792 return;
1793 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1794 if (ipv6_addr_any(&addr))
1795 return;
1796 __ipv6_dev_ac_dec(ifp->idev, &addr);
1797 }
1798
1799 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1800 {
1801 if (dev->addr_len != ETH_ALEN)
1802 return -1;
1803 memcpy(eui, dev->dev_addr, 3);
1804 memcpy(eui + 5, dev->dev_addr + 3, 3);
1805
1806 /*
1807 * The zSeries OSA network cards can be shared among various
1808 * OS instances, but the OSA cards have only one MAC address.
1809 * This leads to duplicate address conflicts in conjunction
1810 * with IPv6 if more than one instance uses the same card.
1811 *
1812 * The driver for these cards can deliver a unique 16-bit
1813 * identifier for each instance sharing the same card. It is
1814 * placed instead of 0xFFFE in the interface identifier. The
1815 * "u" bit of the interface identifier is not inverted in this
1816 * case. Hence the resulting interface identifier has local
1817 * scope according to RFC2373.
1818 */
1819 if (dev->dev_id) {
1820 eui[3] = (dev->dev_id >> 8) & 0xFF;
1821 eui[4] = dev->dev_id & 0xFF;
1822 } else {
1823 eui[3] = 0xFF;
1824 eui[4] = 0xFE;
1825 eui[0] ^= 2;
1826 }
1827 return 0;
1828 }
1829
1830 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1831 {
1832 if (dev->addr_len != IEEE802154_ADDR_LEN)
1833 return -1;
1834 memcpy(eui, dev->dev_addr, 8);
1835 eui[0] ^= 2;
1836 return 0;
1837 }
1838
1839 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1840 {
1841 union fwnet_hwaddr *ha;
1842
1843 if (dev->addr_len != FWNET_ALEN)
1844 return -1;
1845
1846 ha = (union fwnet_hwaddr *)dev->dev_addr;
1847
1848 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1849 eui[0] ^= 2;
1850 return 0;
1851 }
1852
1853 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1854 {
1855 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1856 if (dev->addr_len != ARCNET_ALEN)
1857 return -1;
1858 memset(eui, 0, 7);
1859 eui[7] = *(u8 *)dev->dev_addr;
1860 return 0;
1861 }
1862
1863 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1864 {
1865 if (dev->addr_len != INFINIBAND_ALEN)
1866 return -1;
1867 memcpy(eui, dev->dev_addr + 12, 8);
1868 eui[0] |= 2;
1869 return 0;
1870 }
1871
1872 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1873 {
1874 if (addr == 0)
1875 return -1;
1876 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1877 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1878 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1879 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1880 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1881 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1882 eui[1] = 0;
1883 eui[2] = 0x5E;
1884 eui[3] = 0xFE;
1885 memcpy(eui + 4, &addr, 4);
1886 return 0;
1887 }
1888
1889 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1890 {
1891 if (dev->priv_flags & IFF_ISATAP)
1892 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1893 return -1;
1894 }
1895
1896 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1897 {
1898 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1899 }
1900
1901 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1902 {
1903 memcpy(eui, dev->perm_addr, 3);
1904 memcpy(eui + 5, dev->perm_addr + 3, 3);
1905 eui[3] = 0xFF;
1906 eui[4] = 0xFE;
1907 eui[0] ^= 2;
1908 return 0;
1909 }
1910
1911 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1912 {
1913 switch (dev->type) {
1914 case ARPHRD_ETHER:
1915 case ARPHRD_FDDI:
1916 return addrconf_ifid_eui48(eui, dev);
1917 case ARPHRD_ARCNET:
1918 return addrconf_ifid_arcnet(eui, dev);
1919 case ARPHRD_INFINIBAND:
1920 return addrconf_ifid_infiniband(eui, dev);
1921 case ARPHRD_SIT:
1922 return addrconf_ifid_sit(eui, dev);
1923 case ARPHRD_IPGRE:
1924 return addrconf_ifid_gre(eui, dev);
1925 case ARPHRD_6LOWPAN:
1926 case ARPHRD_IEEE802154:
1927 return addrconf_ifid_eui64(eui, dev);
1928 case ARPHRD_IEEE1394:
1929 return addrconf_ifid_ieee1394(eui, dev);
1930 case ARPHRD_TUNNEL6:
1931 return addrconf_ifid_ip6tnl(eui, dev);
1932 }
1933 return -1;
1934 }
1935
1936 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1937 {
1938 int err = -1;
1939 struct inet6_ifaddr *ifp;
1940
1941 read_lock_bh(&idev->lock);
1942 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1943 if (ifp->scope > IFA_LINK)
1944 break;
1945 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1946 memcpy(eui, ifp->addr.s6_addr+8, 8);
1947 err = 0;
1948 break;
1949 }
1950 }
1951 read_unlock_bh(&idev->lock);
1952 return err;
1953 }
1954
1955 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1956 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1957 {
1958 regen:
1959 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1960 idev->rndid[0] &= ~0x02;
1961
1962 /*
1963 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1964 * check if generated address is not inappropriate
1965 *
1966 * - Reserved subnet anycast (RFC 2526)
1967 * 11111101 11....11 1xxxxxxx
1968 * - ISATAP (RFC4214) 6.1
1969 * 00-00-5E-FE-xx-xx-xx-xx
1970 * - value 0
1971 * - XXX: already assigned to an address on the device
1972 */
1973 if (idev->rndid[0] == 0xfd &&
1974 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1975 (idev->rndid[7]&0x80))
1976 goto regen;
1977 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1978 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1979 goto regen;
1980 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1981 goto regen;
1982 }
1983 }
1984
1985 static void ipv6_regen_rndid(unsigned long data)
1986 {
1987 struct inet6_dev *idev = (struct inet6_dev *) data;
1988 unsigned long expires;
1989
1990 rcu_read_lock_bh();
1991 write_lock_bh(&idev->lock);
1992
1993 if (idev->dead)
1994 goto out;
1995
1996 __ipv6_regen_rndid(idev);
1997
1998 expires = jiffies +
1999 idev->cnf.temp_prefered_lft * HZ -
2000 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2001 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2002 idev->cnf.max_desync_factor * HZ;
2003 if (time_before(expires, jiffies)) {
2004 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2005 __func__, idev->dev->name);
2006 goto out;
2007 }
2008
2009 if (!mod_timer(&idev->regen_timer, expires))
2010 in6_dev_hold(idev);
2011
2012 out:
2013 write_unlock_bh(&idev->lock);
2014 rcu_read_unlock_bh();
2015 in6_dev_put(idev);
2016 }
2017
2018 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2019 {
2020 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2021 __ipv6_regen_rndid(idev);
2022 }
2023
2024 /*
2025 * Add prefix route.
2026 */
2027
2028 static void
2029 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2030 unsigned long expires, u32 flags)
2031 {
2032 struct fib6_config cfg = {
2033 .fc_table = RT6_TABLE_PREFIX,
2034 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2035 .fc_ifindex = dev->ifindex,
2036 .fc_expires = expires,
2037 .fc_dst_len = plen,
2038 .fc_flags = RTF_UP | flags,
2039 .fc_nlinfo.nl_net = dev_net(dev),
2040 .fc_protocol = RTPROT_KERNEL,
2041 };
2042
2043 cfg.fc_dst = *pfx;
2044
2045 /* Prevent useless cloning on PtP SIT.
2046 This thing is done here expecting that the whole
2047 class of non-broadcast devices need not cloning.
2048 */
2049 #if IS_ENABLED(CONFIG_IPV6_SIT)
2050 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2051 cfg.fc_flags |= RTF_NONEXTHOP;
2052 #endif
2053
2054 ip6_route_add(&cfg);
2055 }
2056
2057
2058 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2059 int plen,
2060 const struct net_device *dev,
2061 u32 flags, u32 noflags)
2062 {
2063 struct fib6_node *fn;
2064 struct rt6_info *rt = NULL;
2065 struct fib6_table *table;
2066
2067 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2068 if (table == NULL)
2069 return NULL;
2070
2071 read_lock_bh(&table->tb6_lock);
2072 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2073 if (!fn)
2074 goto out;
2075 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2076 if (rt->dst.dev->ifindex != dev->ifindex)
2077 continue;
2078 if ((rt->rt6i_flags & flags) != flags)
2079 continue;
2080 if ((rt->rt6i_flags & noflags) != 0)
2081 continue;
2082 dst_hold(&rt->dst);
2083 break;
2084 }
2085 out:
2086 read_unlock_bh(&table->tb6_lock);
2087 return rt;
2088 }
2089
2090
2091 /* Create "default" multicast route to the interface */
2092
2093 static void addrconf_add_mroute(struct net_device *dev)
2094 {
2095 struct fib6_config cfg = {
2096 .fc_table = RT6_TABLE_LOCAL,
2097 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2098 .fc_ifindex = dev->ifindex,
2099 .fc_dst_len = 8,
2100 .fc_flags = RTF_UP,
2101 .fc_nlinfo.nl_net = dev_net(dev),
2102 };
2103
2104 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2105
2106 ip6_route_add(&cfg);
2107 }
2108
2109 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2110 {
2111 struct inet6_dev *idev;
2112
2113 ASSERT_RTNL();
2114
2115 idev = ipv6_find_idev(dev);
2116 if (!idev)
2117 return ERR_PTR(-ENOBUFS);
2118
2119 if (idev->cnf.disable_ipv6)
2120 return ERR_PTR(-EACCES);
2121
2122 /* Add default multicast route */
2123 if (!(dev->flags & IFF_LOOPBACK))
2124 addrconf_add_mroute(dev);
2125
2126 return idev;
2127 }
2128
2129 static void manage_tempaddrs(struct inet6_dev *idev,
2130 struct inet6_ifaddr *ifp,
2131 __u32 valid_lft, __u32 prefered_lft,
2132 bool create, unsigned long now)
2133 {
2134 u32 flags;
2135 struct inet6_ifaddr *ift;
2136
2137 read_lock_bh(&idev->lock);
2138 /* update all temporary addresses in the list */
2139 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2140 int age, max_valid, max_prefered;
2141
2142 if (ifp != ift->ifpub)
2143 continue;
2144
2145 /* RFC 4941 section 3.3:
2146 * If a received option will extend the lifetime of a public
2147 * address, the lifetimes of temporary addresses should
2148 * be extended, subject to the overall constraint that no
2149 * temporary addresses should ever remain "valid" or "preferred"
2150 * for a time longer than (TEMP_VALID_LIFETIME) or
2151 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2152 */
2153 age = (now - ift->cstamp) / HZ;
2154 max_valid = idev->cnf.temp_valid_lft - age;
2155 if (max_valid < 0)
2156 max_valid = 0;
2157
2158 max_prefered = idev->cnf.temp_prefered_lft -
2159 idev->cnf.max_desync_factor - age;
2160 if (max_prefered < 0)
2161 max_prefered = 0;
2162
2163 if (valid_lft > max_valid)
2164 valid_lft = max_valid;
2165
2166 if (prefered_lft > max_prefered)
2167 prefered_lft = max_prefered;
2168
2169 spin_lock(&ift->lock);
2170 flags = ift->flags;
2171 ift->valid_lft = valid_lft;
2172 ift->prefered_lft = prefered_lft;
2173 ift->tstamp = now;
2174 if (prefered_lft > 0)
2175 ift->flags &= ~IFA_F_DEPRECATED;
2176
2177 spin_unlock(&ift->lock);
2178 if (!(flags&IFA_F_TENTATIVE))
2179 ipv6_ifa_notify(0, ift);
2180 }
2181
2182 if ((create || list_empty(&idev->tempaddr_list)) &&
2183 idev->cnf.use_tempaddr > 0) {
2184 /* When a new public address is created as described
2185 * in [ADDRCONF], also create a new temporary address.
2186 * Also create a temporary address if it's enabled but
2187 * no temporary address currently exists.
2188 */
2189 read_unlock_bh(&idev->lock);
2190 ipv6_create_tempaddr(ifp, NULL);
2191 } else {
2192 read_unlock_bh(&idev->lock);
2193 }
2194 }
2195
2196 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2197 {
2198 struct prefix_info *pinfo;
2199 __u32 valid_lft;
2200 __u32 prefered_lft;
2201 int addr_type;
2202 struct inet6_dev *in6_dev;
2203 struct net *net = dev_net(dev);
2204
2205 pinfo = (struct prefix_info *) opt;
2206
2207 if (len < sizeof(struct prefix_info)) {
2208 ADBG("addrconf: prefix option too short\n");
2209 return;
2210 }
2211
2212 /*
2213 * Validation checks ([ADDRCONF], page 19)
2214 */
2215
2216 addr_type = ipv6_addr_type(&pinfo->prefix);
2217
2218 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2219 return;
2220
2221 valid_lft = ntohl(pinfo->valid);
2222 prefered_lft = ntohl(pinfo->prefered);
2223
2224 if (prefered_lft > valid_lft) {
2225 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2226 return;
2227 }
2228
2229 in6_dev = in6_dev_get(dev);
2230
2231 if (in6_dev == NULL) {
2232 net_dbg_ratelimited("addrconf: device %s not configured\n",
2233 dev->name);
2234 return;
2235 }
2236
2237 /*
2238 * Two things going on here:
2239 * 1) Add routes for on-link prefixes
2240 * 2) Configure prefixes with the auto flag set
2241 */
2242
2243 if (pinfo->onlink) {
2244 struct rt6_info *rt;
2245 unsigned long rt_expires;
2246
2247 /* Avoid arithmetic overflow. Really, we could
2248 * save rt_expires in seconds, likely valid_lft,
2249 * but it would require division in fib gc, that it
2250 * not good.
2251 */
2252 if (HZ > USER_HZ)
2253 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2254 else
2255 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2256
2257 if (addrconf_finite_timeout(rt_expires))
2258 rt_expires *= HZ;
2259
2260 rt = addrconf_get_prefix_route(&pinfo->prefix,
2261 pinfo->prefix_len,
2262 dev,
2263 RTF_ADDRCONF | RTF_PREFIX_RT,
2264 RTF_GATEWAY | RTF_DEFAULT);
2265
2266 if (rt) {
2267 /* Autoconf prefix route */
2268 if (valid_lft == 0) {
2269 ip6_del_rt(rt);
2270 rt = NULL;
2271 } else if (addrconf_finite_timeout(rt_expires)) {
2272 /* not infinity */
2273 rt6_set_expires(rt, jiffies + rt_expires);
2274 } else {
2275 rt6_clean_expires(rt);
2276 }
2277 } else if (valid_lft) {
2278 clock_t expires = 0;
2279 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2280 if (addrconf_finite_timeout(rt_expires)) {
2281 /* not infinity */
2282 flags |= RTF_EXPIRES;
2283 expires = jiffies_to_clock_t(rt_expires);
2284 }
2285 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2286 dev, expires, flags);
2287 }
2288 ip6_rt_put(rt);
2289 }
2290
2291 /* Try to figure out our local address for this prefix */
2292
2293 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2294 struct inet6_ifaddr *ifp;
2295 struct in6_addr addr;
2296 int create = 0, update_lft = 0;
2297 bool tokenized = false;
2298
2299 if (pinfo->prefix_len == 64) {
2300 memcpy(&addr, &pinfo->prefix, 8);
2301
2302 if (!ipv6_addr_any(&in6_dev->token)) {
2303 read_lock_bh(&in6_dev->lock);
2304 memcpy(addr.s6_addr + 8,
2305 in6_dev->token.s6_addr + 8, 8);
2306 read_unlock_bh(&in6_dev->lock);
2307 tokenized = true;
2308 } else if (in6_dev->addr_gen_mode ==
2309 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2310 !ipv6_generate_stable_address(&addr, 0,
2311 in6_dev)) {
2312 goto ok;
2313 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2314 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2315 in6_dev_put(in6_dev);
2316 return;
2317 }
2318 goto ok;
2319 }
2320 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2321 pinfo->prefix_len);
2322 in6_dev_put(in6_dev);
2323 return;
2324
2325 ok:
2326
2327 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2328
2329 if (ifp == NULL && valid_lft) {
2330 int max_addresses = in6_dev->cnf.max_addresses;
2331 u32 addr_flags = 0;
2332
2333 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2334 if (in6_dev->cnf.optimistic_dad &&
2335 !net->ipv6.devconf_all->forwarding && sllao)
2336 addr_flags = IFA_F_OPTIMISTIC;
2337 #endif
2338
2339 /* Do not allow to create too much of autoconfigured
2340 * addresses; this would be too easy way to crash kernel.
2341 */
2342 if (!max_addresses ||
2343 ipv6_count_addresses(in6_dev) < max_addresses)
2344 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2345 pinfo->prefix_len,
2346 addr_type&IPV6_ADDR_SCOPE_MASK,
2347 addr_flags, valid_lft,
2348 prefered_lft);
2349
2350 if (IS_ERR_OR_NULL(ifp)) {
2351 in6_dev_put(in6_dev);
2352 return;
2353 }
2354
2355 update_lft = 0;
2356 create = 1;
2357 spin_lock_bh(&ifp->lock);
2358 ifp->flags |= IFA_F_MANAGETEMPADDR;
2359 ifp->cstamp = jiffies;
2360 ifp->tokenized = tokenized;
2361 spin_unlock_bh(&ifp->lock);
2362 addrconf_dad_start(ifp);
2363 }
2364
2365 if (ifp) {
2366 u32 flags;
2367 unsigned long now;
2368 u32 stored_lft;
2369
2370 /* update lifetime (RFC2462 5.5.3 e) */
2371 spin_lock(&ifp->lock);
2372 now = jiffies;
2373 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2374 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2375 else
2376 stored_lft = 0;
2377 if (!update_lft && !create && stored_lft) {
2378 const u32 minimum_lft = min_t(u32,
2379 stored_lft, MIN_VALID_LIFETIME);
2380 valid_lft = max(valid_lft, minimum_lft);
2381
2382 /* RFC4862 Section 5.5.3e:
2383 * "Note that the preferred lifetime of the
2384 * corresponding address is always reset to
2385 * the Preferred Lifetime in the received
2386 * Prefix Information option, regardless of
2387 * whether the valid lifetime is also reset or
2388 * ignored."
2389 *
2390 * So we should always update prefered_lft here.
2391 */
2392 update_lft = 1;
2393 }
2394
2395 if (update_lft) {
2396 ifp->valid_lft = valid_lft;
2397 ifp->prefered_lft = prefered_lft;
2398 ifp->tstamp = now;
2399 flags = ifp->flags;
2400 ifp->flags &= ~IFA_F_DEPRECATED;
2401 spin_unlock(&ifp->lock);
2402
2403 if (!(flags&IFA_F_TENTATIVE))
2404 ipv6_ifa_notify(0, ifp);
2405 } else
2406 spin_unlock(&ifp->lock);
2407
2408 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2409 create, now);
2410
2411 in6_ifa_put(ifp);
2412 addrconf_verify();
2413 }
2414 }
2415 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2416 in6_dev_put(in6_dev);
2417 }
2418
2419 /*
2420 * Set destination address.
2421 * Special case for SIT interfaces where we create a new "virtual"
2422 * device.
2423 */
2424 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2425 {
2426 struct in6_ifreq ireq;
2427 struct net_device *dev;
2428 int err = -EINVAL;
2429
2430 rtnl_lock();
2431
2432 err = -EFAULT;
2433 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2434 goto err_exit;
2435
2436 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2437
2438 err = -ENODEV;
2439 if (dev == NULL)
2440 goto err_exit;
2441
2442 #if IS_ENABLED(CONFIG_IPV6_SIT)
2443 if (dev->type == ARPHRD_SIT) {
2444 const struct net_device_ops *ops = dev->netdev_ops;
2445 struct ifreq ifr;
2446 struct ip_tunnel_parm p;
2447
2448 err = -EADDRNOTAVAIL;
2449 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2450 goto err_exit;
2451
2452 memset(&p, 0, sizeof(p));
2453 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2454 p.iph.saddr = 0;
2455 p.iph.version = 4;
2456 p.iph.ihl = 5;
2457 p.iph.protocol = IPPROTO_IPV6;
2458 p.iph.ttl = 64;
2459 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2460
2461 if (ops->ndo_do_ioctl) {
2462 mm_segment_t oldfs = get_fs();
2463
2464 set_fs(KERNEL_DS);
2465 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2466 set_fs(oldfs);
2467 } else
2468 err = -EOPNOTSUPP;
2469
2470 if (err == 0) {
2471 err = -ENOBUFS;
2472 dev = __dev_get_by_name(net, p.name);
2473 if (!dev)
2474 goto err_exit;
2475 err = dev_open(dev);
2476 }
2477 }
2478 #endif
2479
2480 err_exit:
2481 rtnl_unlock();
2482 return err;
2483 }
2484
2485 static int ipv6_mc_config(struct sock *sk, bool join,
2486 const struct in6_addr *addr, int ifindex)
2487 {
2488 int ret;
2489
2490 ASSERT_RTNL();
2491
2492 lock_sock(sk);
2493 if (join)
2494 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2495 else
2496 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2497 release_sock(sk);
2498
2499 return ret;
2500 }
2501
2502 /*
2503 * Manual configuration of address on an interface
2504 */
2505 static int inet6_addr_add(struct net *net, int ifindex,
2506 const struct in6_addr *pfx,
2507 const struct in6_addr *peer_pfx,
2508 unsigned int plen, __u32 ifa_flags,
2509 __u32 prefered_lft, __u32 valid_lft)
2510 {
2511 struct inet6_ifaddr *ifp;
2512 struct inet6_dev *idev;
2513 struct net_device *dev;
2514 unsigned long timeout;
2515 clock_t expires;
2516 int scope;
2517 u32 flags;
2518
2519 ASSERT_RTNL();
2520
2521 if (plen > 128)
2522 return -EINVAL;
2523
2524 /* check the lifetime */
2525 if (!valid_lft || prefered_lft > valid_lft)
2526 return -EINVAL;
2527
2528 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2529 return -EINVAL;
2530
2531 dev = __dev_get_by_index(net, ifindex);
2532 if (!dev)
2533 return -ENODEV;
2534
2535 idev = addrconf_add_dev(dev);
2536 if (IS_ERR(idev))
2537 return PTR_ERR(idev);
2538
2539 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2540 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2541 true, pfx, ifindex);
2542
2543 if (ret < 0)
2544 return ret;
2545 }
2546
2547 scope = ipv6_addr_scope(pfx);
2548
2549 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2550 if (addrconf_finite_timeout(timeout)) {
2551 expires = jiffies_to_clock_t(timeout * HZ);
2552 valid_lft = timeout;
2553 flags = RTF_EXPIRES;
2554 } else {
2555 expires = 0;
2556 flags = 0;
2557 ifa_flags |= IFA_F_PERMANENT;
2558 }
2559
2560 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2561 if (addrconf_finite_timeout(timeout)) {
2562 if (timeout == 0)
2563 ifa_flags |= IFA_F_DEPRECATED;
2564 prefered_lft = timeout;
2565 }
2566
2567 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2568 valid_lft, prefered_lft);
2569
2570 if (!IS_ERR(ifp)) {
2571 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2572 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2573 expires, flags);
2574 }
2575
2576 /*
2577 * Note that section 3.1 of RFC 4429 indicates
2578 * that the Optimistic flag should not be set for
2579 * manually configured addresses
2580 */
2581 addrconf_dad_start(ifp);
2582 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2583 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2584 true, jiffies);
2585 in6_ifa_put(ifp);
2586 addrconf_verify_rtnl();
2587 return 0;
2588 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2589 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2590 false, pfx, ifindex);
2591 }
2592
2593 return PTR_ERR(ifp);
2594 }
2595
2596 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2597 const struct in6_addr *pfx, unsigned int plen)
2598 {
2599 struct inet6_ifaddr *ifp;
2600 struct inet6_dev *idev;
2601 struct net_device *dev;
2602
2603 if (plen > 128)
2604 return -EINVAL;
2605
2606 dev = __dev_get_by_index(net, ifindex);
2607 if (!dev)
2608 return -ENODEV;
2609
2610 idev = __in6_dev_get(dev);
2611 if (idev == NULL)
2612 return -ENXIO;
2613
2614 read_lock_bh(&idev->lock);
2615 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2616 if (ifp->prefix_len == plen &&
2617 ipv6_addr_equal(pfx, &ifp->addr)) {
2618 in6_ifa_hold(ifp);
2619 read_unlock_bh(&idev->lock);
2620
2621 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2622 (ifa_flags & IFA_F_MANAGETEMPADDR))
2623 manage_tempaddrs(idev, ifp, 0, 0, false,
2624 jiffies);
2625 ipv6_del_addr(ifp);
2626 addrconf_verify_rtnl();
2627 if (ipv6_addr_is_multicast(pfx)) {
2628 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2629 false, pfx, dev->ifindex);
2630 }
2631 return 0;
2632 }
2633 }
2634 read_unlock_bh(&idev->lock);
2635 return -EADDRNOTAVAIL;
2636 }
2637
2638
2639 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2640 {
2641 struct in6_ifreq ireq;
2642 int err;
2643
2644 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2645 return -EPERM;
2646
2647 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2648 return -EFAULT;
2649
2650 rtnl_lock();
2651 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2652 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2653 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2654 rtnl_unlock();
2655 return err;
2656 }
2657
2658 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2659 {
2660 struct in6_ifreq ireq;
2661 int err;
2662
2663 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2664 return -EPERM;
2665
2666 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2667 return -EFAULT;
2668
2669 rtnl_lock();
2670 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2671 ireq.ifr6_prefixlen);
2672 rtnl_unlock();
2673 return err;
2674 }
2675
2676 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2677 int plen, int scope)
2678 {
2679 struct inet6_ifaddr *ifp;
2680
2681 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2682 scope, IFA_F_PERMANENT,
2683 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2684 if (!IS_ERR(ifp)) {
2685 spin_lock_bh(&ifp->lock);
2686 ifp->flags &= ~IFA_F_TENTATIVE;
2687 spin_unlock_bh(&ifp->lock);
2688 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2689 in6_ifa_put(ifp);
2690 }
2691 }
2692
2693 #if IS_ENABLED(CONFIG_IPV6_SIT)
2694 static void sit_add_v4_addrs(struct inet6_dev *idev)
2695 {
2696 struct in6_addr addr;
2697 struct net_device *dev;
2698 struct net *net = dev_net(idev->dev);
2699 int scope, plen;
2700 u32 pflags = 0;
2701
2702 ASSERT_RTNL();
2703
2704 memset(&addr, 0, sizeof(struct in6_addr));
2705 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2706
2707 if (idev->dev->flags&IFF_POINTOPOINT) {
2708 addr.s6_addr32[0] = htonl(0xfe800000);
2709 scope = IFA_LINK;
2710 plen = 64;
2711 } else {
2712 scope = IPV6_ADDR_COMPATv4;
2713 plen = 96;
2714 pflags |= RTF_NONEXTHOP;
2715 }
2716
2717 if (addr.s6_addr32[3]) {
2718 add_addr(idev, &addr, plen, scope);
2719 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2720 return;
2721 }
2722
2723 for_each_netdev(net, dev) {
2724 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2725 if (in_dev && (dev->flags & IFF_UP)) {
2726 struct in_ifaddr *ifa;
2727
2728 int flag = scope;
2729
2730 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2731
2732 addr.s6_addr32[3] = ifa->ifa_local;
2733
2734 if (ifa->ifa_scope == RT_SCOPE_LINK)
2735 continue;
2736 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2737 if (idev->dev->flags&IFF_POINTOPOINT)
2738 continue;
2739 flag |= IFA_HOST;
2740 }
2741
2742 add_addr(idev, &addr, plen, flag);
2743 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2744 pflags);
2745 }
2746 }
2747 }
2748 }
2749 #endif
2750
2751 static void init_loopback(struct net_device *dev)
2752 {
2753 struct inet6_dev *idev;
2754 struct net_device *sp_dev;
2755 struct inet6_ifaddr *sp_ifa;
2756 struct rt6_info *sp_rt;
2757
2758 /* ::1 */
2759
2760 ASSERT_RTNL();
2761
2762 idev = ipv6_find_idev(dev);
2763 if (idev == NULL) {
2764 pr_debug("%s: add_dev failed\n", __func__);
2765 return;
2766 }
2767
2768 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2769
2770 /* Add routes to other interface's IPv6 addresses */
2771 for_each_netdev(dev_net(dev), sp_dev) {
2772 if (!strcmp(sp_dev->name, dev->name))
2773 continue;
2774
2775 idev = __in6_dev_get(sp_dev);
2776 if (!idev)
2777 continue;
2778
2779 read_lock_bh(&idev->lock);
2780 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2781
2782 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2783 continue;
2784
2785 if (sp_ifa->rt) {
2786 /* This dst has been added to garbage list when
2787 * lo device down, release this obsolete dst and
2788 * reallocate a new router for ifa.
2789 */
2790 if (sp_ifa->rt->dst.obsolete > 0) {
2791 ip6_rt_put(sp_ifa->rt);
2792 sp_ifa->rt = NULL;
2793 } else {
2794 continue;
2795 }
2796 }
2797
2798 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2799
2800 /* Failure cases are ignored */
2801 if (!IS_ERR(sp_rt)) {
2802 sp_ifa->rt = sp_rt;
2803 ip6_ins_rt(sp_rt);
2804 }
2805 }
2806 read_unlock_bh(&idev->lock);
2807 }
2808 }
2809
2810 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2811 {
2812 struct inet6_ifaddr *ifp;
2813 u32 addr_flags = IFA_F_PERMANENT;
2814
2815 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2816 if (idev->cnf.optimistic_dad &&
2817 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2818 addr_flags |= IFA_F_OPTIMISTIC;
2819 #endif
2820
2821
2822 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2823 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2824 if (!IS_ERR(ifp)) {
2825 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2826 addrconf_dad_start(ifp);
2827 in6_ifa_put(ifp);
2828 }
2829 }
2830
2831 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2832 {
2833 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2834 return true;
2835
2836 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2837 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2838 return true;
2839
2840 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2841 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2842 return true;
2843
2844 return false;
2845 }
2846
2847 static int ipv6_generate_stable_address(struct in6_addr *address,
2848 u8 dad_count,
2849 const struct inet6_dev *idev)
2850 {
2851 static const int idgen_retries = 3;
2852
2853 static DEFINE_SPINLOCK(lock);
2854 static __u32 digest[SHA_DIGEST_WORDS];
2855 static __u32 workspace[SHA_WORKSPACE_WORDS];
2856
2857 static union {
2858 char __data[SHA_MESSAGE_BYTES];
2859 struct {
2860 struct in6_addr secret;
2861 __be64 prefix;
2862 unsigned char hwaddr[MAX_ADDR_LEN];
2863 u8 dad_count;
2864 } __packed;
2865 } data;
2866
2867 struct in6_addr secret;
2868 struct in6_addr temp;
2869 struct net *net = dev_net(idev->dev);
2870
2871 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2872
2873 if (idev->cnf.stable_secret.initialized)
2874 secret = idev->cnf.stable_secret.secret;
2875 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
2876 secret = net->ipv6.devconf_dflt->stable_secret.secret;
2877 else
2878 return -1;
2879
2880 retry:
2881 spin_lock_bh(&lock);
2882
2883 sha_init(digest);
2884 memset(&data, 0, sizeof(data));
2885 memset(workspace, 0, sizeof(workspace));
2886 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
2887 data.prefix = ((__be64)address->s6_addr32[0] << 32) |
2888 (__be64)address->s6_addr32[1];
2889 data.secret = secret;
2890 data.dad_count = dad_count;
2891
2892 sha_transform(digest, data.__data, workspace);
2893
2894 temp = *address;
2895 temp.s6_addr32[2] = digest[0];
2896 temp.s6_addr32[3] = digest[1];
2897
2898 spin_unlock_bh(&lock);
2899
2900 if (ipv6_reserved_interfaceid(temp)) {
2901 dad_count++;
2902 if (dad_count > idgen_retries)
2903 return -1;
2904 goto retry;
2905 }
2906
2907 *address = temp;
2908 return 0;
2909 }
2910
2911 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
2912 {
2913 struct in6_addr addr;
2914
2915 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2916
2917 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
2918 if (!ipv6_generate_stable_address(&addr, 0, idev))
2919 addrconf_add_linklocal(idev, &addr);
2920 else if (prefix_route)
2921 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2922 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
2923 /* addrconf_add_linklocal also adds a prefix_route and we
2924 * only need to care about prefix routes if ipv6_generate_eui64
2925 * couldn't generate one.
2926 */
2927 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
2928 addrconf_add_linklocal(idev, &addr);
2929 else if (prefix_route)
2930 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2931 }
2932 }
2933
2934 static void addrconf_dev_config(struct net_device *dev)
2935 {
2936 struct inet6_dev *idev;
2937
2938 ASSERT_RTNL();
2939
2940 if ((dev->type != ARPHRD_ETHER) &&
2941 (dev->type != ARPHRD_FDDI) &&
2942 (dev->type != ARPHRD_ARCNET) &&
2943 (dev->type != ARPHRD_INFINIBAND) &&
2944 (dev->type != ARPHRD_IEEE802154) &&
2945 (dev->type != ARPHRD_IEEE1394) &&
2946 (dev->type != ARPHRD_TUNNEL6) &&
2947 (dev->type != ARPHRD_6LOWPAN)) {
2948 /* Alas, we support only Ethernet autoconfiguration. */
2949 return;
2950 }
2951
2952 idev = addrconf_add_dev(dev);
2953 if (IS_ERR(idev))
2954 return;
2955
2956 addrconf_addr_gen(idev, false);
2957 }
2958
2959 #if IS_ENABLED(CONFIG_IPV6_SIT)
2960 static void addrconf_sit_config(struct net_device *dev)
2961 {
2962 struct inet6_dev *idev;
2963
2964 ASSERT_RTNL();
2965
2966 /*
2967 * Configure the tunnel with one of our IPv4
2968 * addresses... we should configure all of
2969 * our v4 addrs in the tunnel
2970 */
2971
2972 idev = ipv6_find_idev(dev);
2973 if (idev == NULL) {
2974 pr_debug("%s: add_dev failed\n", __func__);
2975 return;
2976 }
2977
2978 if (dev->priv_flags & IFF_ISATAP) {
2979 addrconf_addr_gen(idev, false);
2980 return;
2981 }
2982
2983 sit_add_v4_addrs(idev);
2984
2985 if (dev->flags&IFF_POINTOPOINT)
2986 addrconf_add_mroute(dev);
2987 }
2988 #endif
2989
2990 #if IS_ENABLED(CONFIG_NET_IPGRE)
2991 static void addrconf_gre_config(struct net_device *dev)
2992 {
2993 struct inet6_dev *idev;
2994
2995 ASSERT_RTNL();
2996
2997 idev = ipv6_find_idev(dev);
2998 if (idev == NULL) {
2999 pr_debug("%s: add_dev failed\n", __func__);
3000 return;
3001 }
3002
3003 addrconf_addr_gen(idev, true);
3004 }
3005 #endif
3006
3007 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3008 void *ptr)
3009 {
3010 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3011 struct inet6_dev *idev = __in6_dev_get(dev);
3012 int run_pending = 0;
3013 int err;
3014
3015 switch (event) {
3016 case NETDEV_REGISTER:
3017 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3018 idev = ipv6_add_dev(dev);
3019 if (IS_ERR(idev))
3020 return notifier_from_errno(PTR_ERR(idev));
3021 }
3022 break;
3023
3024 case NETDEV_UP:
3025 case NETDEV_CHANGE:
3026 if (dev->flags & IFF_SLAVE)
3027 break;
3028
3029 if (idev && idev->cnf.disable_ipv6)
3030 break;
3031
3032 if (event == NETDEV_UP) {
3033 if (!addrconf_qdisc_ok(dev)) {
3034 /* device is not ready yet. */
3035 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3036 dev->name);
3037 break;
3038 }
3039
3040 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3041 idev = ipv6_add_dev(dev);
3042
3043 if (!IS_ERR_OR_NULL(idev)) {
3044 idev->if_flags |= IF_READY;
3045 run_pending = 1;
3046 }
3047 } else {
3048 if (!addrconf_qdisc_ok(dev)) {
3049 /* device is still not ready. */
3050 break;
3051 }
3052
3053 if (idev) {
3054 if (idev->if_flags & IF_READY)
3055 /* device is already configured. */
3056 break;
3057 idev->if_flags |= IF_READY;
3058 }
3059
3060 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3061 dev->name);
3062
3063 run_pending = 1;
3064 }
3065
3066 switch (dev->type) {
3067 #if IS_ENABLED(CONFIG_IPV6_SIT)
3068 case ARPHRD_SIT:
3069 addrconf_sit_config(dev);
3070 break;
3071 #endif
3072 #if IS_ENABLED(CONFIG_NET_IPGRE)
3073 case ARPHRD_IPGRE:
3074 addrconf_gre_config(dev);
3075 break;
3076 #endif
3077 case ARPHRD_LOOPBACK:
3078 init_loopback(dev);
3079 break;
3080
3081 default:
3082 addrconf_dev_config(dev);
3083 break;
3084 }
3085
3086 if (!IS_ERR_OR_NULL(idev)) {
3087 if (run_pending)
3088 addrconf_dad_run(idev);
3089
3090 /*
3091 * If the MTU changed during the interface down,
3092 * when the interface up, the changed MTU must be
3093 * reflected in the idev as well as routers.
3094 */
3095 if (idev->cnf.mtu6 != dev->mtu &&
3096 dev->mtu >= IPV6_MIN_MTU) {
3097 rt6_mtu_change(dev, dev->mtu);
3098 idev->cnf.mtu6 = dev->mtu;
3099 }
3100 idev->tstamp = jiffies;
3101 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3102
3103 /*
3104 * If the changed mtu during down is lower than
3105 * IPV6_MIN_MTU stop IPv6 on this interface.
3106 */
3107 if (dev->mtu < IPV6_MIN_MTU)
3108 addrconf_ifdown(dev, 1);
3109 }
3110 break;
3111
3112 case NETDEV_CHANGEMTU:
3113 if (idev && dev->mtu >= IPV6_MIN_MTU) {
3114 rt6_mtu_change(dev, dev->mtu);
3115 idev->cnf.mtu6 = dev->mtu;
3116 break;
3117 }
3118
3119 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3120 idev = ipv6_add_dev(dev);
3121 if (!IS_ERR(idev))
3122 break;
3123 }
3124
3125 /*
3126 * if MTU under IPV6_MIN_MTU.
3127 * Stop IPv6 on this interface.
3128 */
3129
3130 case NETDEV_DOWN:
3131 case NETDEV_UNREGISTER:
3132 /*
3133 * Remove all addresses from this interface.
3134 */
3135 addrconf_ifdown(dev, event != NETDEV_DOWN);
3136 break;
3137
3138 case NETDEV_CHANGENAME:
3139 if (idev) {
3140 snmp6_unregister_dev(idev);
3141 addrconf_sysctl_unregister(idev);
3142 err = addrconf_sysctl_register(idev);
3143 if (err)
3144 return notifier_from_errno(err);
3145 err = snmp6_register_dev(idev);
3146 if (err) {
3147 addrconf_sysctl_unregister(idev);
3148 return notifier_from_errno(err);
3149 }
3150 }
3151 break;
3152
3153 case NETDEV_PRE_TYPE_CHANGE:
3154 case NETDEV_POST_TYPE_CHANGE:
3155 addrconf_type_change(dev, event);
3156 break;
3157 }
3158
3159 return NOTIFY_OK;
3160 }
3161
3162 /*
3163 * addrconf module should be notified of a device going up
3164 */
3165 static struct notifier_block ipv6_dev_notf = {
3166 .notifier_call = addrconf_notify,
3167 };
3168
3169 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3170 {
3171 struct inet6_dev *idev;
3172 ASSERT_RTNL();
3173
3174 idev = __in6_dev_get(dev);
3175
3176 if (event == NETDEV_POST_TYPE_CHANGE)
3177 ipv6_mc_remap(idev);
3178 else if (event == NETDEV_PRE_TYPE_CHANGE)
3179 ipv6_mc_unmap(idev);
3180 }
3181
3182 static int addrconf_ifdown(struct net_device *dev, int how)
3183 {
3184 struct net *net = dev_net(dev);
3185 struct inet6_dev *idev;
3186 struct inet6_ifaddr *ifa;
3187 int state, i;
3188
3189 ASSERT_RTNL();
3190
3191 rt6_ifdown(net, dev);
3192 neigh_ifdown(&nd_tbl, dev);
3193
3194 idev = __in6_dev_get(dev);
3195 if (idev == NULL)
3196 return -ENODEV;
3197
3198 /*
3199 * Step 1: remove reference to ipv6 device from parent device.
3200 * Do not dev_put!
3201 */
3202 if (how) {
3203 idev->dead = 1;
3204
3205 /* protected by rtnl_lock */
3206 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3207
3208 /* Step 1.5: remove snmp6 entry */
3209 snmp6_unregister_dev(idev);
3210
3211 }
3212
3213 /* Step 2: clear hash table */
3214 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3215 struct hlist_head *h = &inet6_addr_lst[i];
3216
3217 spin_lock_bh(&addrconf_hash_lock);
3218 restart:
3219 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3220 if (ifa->idev == idev) {
3221 hlist_del_init_rcu(&ifa->addr_lst);
3222 addrconf_del_dad_work(ifa);
3223 goto restart;
3224 }
3225 }
3226 spin_unlock_bh(&addrconf_hash_lock);
3227 }
3228
3229 write_lock_bh(&idev->lock);
3230
3231 addrconf_del_rs_timer(idev);
3232
3233 /* Step 2: clear flags for stateless addrconf */
3234 if (!how)
3235 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3236
3237 if (how && del_timer(&idev->regen_timer))
3238 in6_dev_put(idev);
3239
3240 /* Step 3: clear tempaddr list */
3241 while (!list_empty(&idev->tempaddr_list)) {
3242 ifa = list_first_entry(&idev->tempaddr_list,
3243 struct inet6_ifaddr, tmp_list);
3244 list_del(&ifa->tmp_list);
3245 write_unlock_bh(&idev->lock);
3246 spin_lock_bh(&ifa->lock);
3247
3248 if (ifa->ifpub) {
3249 in6_ifa_put(ifa->ifpub);
3250 ifa->ifpub = NULL;
3251 }
3252 spin_unlock_bh(&ifa->lock);
3253 in6_ifa_put(ifa);
3254 write_lock_bh(&idev->lock);
3255 }
3256
3257 while (!list_empty(&idev->addr_list)) {
3258 ifa = list_first_entry(&idev->addr_list,
3259 struct inet6_ifaddr, if_list);
3260 addrconf_del_dad_work(ifa);
3261
3262 list_del(&ifa->if_list);
3263
3264 write_unlock_bh(&idev->lock);
3265
3266 spin_lock_bh(&ifa->state_lock);
3267 state = ifa->state;
3268 ifa->state = INET6_IFADDR_STATE_DEAD;
3269 spin_unlock_bh(&ifa->state_lock);
3270
3271 if (state != INET6_IFADDR_STATE_DEAD) {
3272 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3273 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3274 }
3275 in6_ifa_put(ifa);
3276
3277 write_lock_bh(&idev->lock);
3278 }
3279
3280 write_unlock_bh(&idev->lock);
3281
3282 /* Step 5: Discard anycast and multicast list */
3283 if (how) {
3284 ipv6_ac_destroy_dev(idev);
3285 ipv6_mc_destroy_dev(idev);
3286 } else {
3287 ipv6_mc_down(idev);
3288 }
3289
3290 idev->tstamp = jiffies;
3291
3292 /* Last: Shot the device (if unregistered) */
3293 if (how) {
3294 addrconf_sysctl_unregister(idev);
3295 neigh_parms_release(&nd_tbl, idev->nd_parms);
3296 neigh_ifdown(&nd_tbl, dev);
3297 in6_dev_put(idev);
3298 }
3299 return 0;
3300 }
3301
3302 static void addrconf_rs_timer(unsigned long data)
3303 {
3304 struct inet6_dev *idev = (struct inet6_dev *)data;
3305 struct net_device *dev = idev->dev;
3306 struct in6_addr lladdr;
3307
3308 write_lock(&idev->lock);
3309 if (idev->dead || !(idev->if_flags & IF_READY))
3310 goto out;
3311
3312 if (!ipv6_accept_ra(idev))
3313 goto out;
3314
3315 /* Announcement received after solicitation was sent */
3316 if (idev->if_flags & IF_RA_RCVD)
3317 goto out;
3318
3319 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3320 write_unlock(&idev->lock);
3321 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3322 ndisc_send_rs(dev, &lladdr,
3323 &in6addr_linklocal_allrouters);
3324 else
3325 goto put;
3326
3327 write_lock(&idev->lock);
3328 /* The wait after the last probe can be shorter */
3329 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3330 idev->cnf.rtr_solicits) ?
3331 idev->cnf.rtr_solicit_delay :
3332 idev->cnf.rtr_solicit_interval);
3333 } else {
3334 /*
3335 * Note: we do not support deprecated "all on-link"
3336 * assumption any longer.
3337 */
3338 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3339 }
3340
3341 out:
3342 write_unlock(&idev->lock);
3343 put:
3344 in6_dev_put(idev);
3345 }
3346
3347 /*
3348 * Duplicate Address Detection
3349 */
3350 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3351 {
3352 unsigned long rand_num;
3353 struct inet6_dev *idev = ifp->idev;
3354
3355 if (ifp->flags & IFA_F_OPTIMISTIC)
3356 rand_num = 0;
3357 else
3358 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3359
3360 ifp->dad_probes = idev->cnf.dad_transmits;
3361 addrconf_mod_dad_work(ifp, rand_num);
3362 }
3363
3364 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3365 {
3366 struct inet6_dev *idev = ifp->idev;
3367 struct net_device *dev = idev->dev;
3368
3369 addrconf_join_solict(dev, &ifp->addr);
3370
3371 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3372
3373 read_lock_bh(&idev->lock);
3374 spin_lock(&ifp->lock);
3375 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3376 goto out;
3377
3378 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3379 idev->cnf.accept_dad < 1 ||
3380 !(ifp->flags&IFA_F_TENTATIVE) ||
3381 ifp->flags & IFA_F_NODAD) {
3382 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3383 spin_unlock(&ifp->lock);
3384 read_unlock_bh(&idev->lock);
3385
3386 addrconf_dad_completed(ifp);
3387 return;
3388 }
3389
3390 if (!(idev->if_flags & IF_READY)) {
3391 spin_unlock(&ifp->lock);
3392 read_unlock_bh(&idev->lock);
3393 /*
3394 * If the device is not ready:
3395 * - keep it tentative if it is a permanent address.
3396 * - otherwise, kill it.
3397 */
3398 in6_ifa_hold(ifp);
3399 addrconf_dad_stop(ifp, 0);
3400 return;
3401 }
3402
3403 /*
3404 * Optimistic nodes can start receiving
3405 * Frames right away
3406 */
3407 if (ifp->flags & IFA_F_OPTIMISTIC) {
3408 ip6_ins_rt(ifp->rt);
3409 if (ipv6_use_optimistic_addr(idev)) {
3410 /* Because optimistic nodes can use this address,
3411 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3412 */
3413 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3414 }
3415 }
3416
3417 addrconf_dad_kick(ifp);
3418 out:
3419 spin_unlock(&ifp->lock);
3420 read_unlock_bh(&idev->lock);
3421 }
3422
3423 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3424 {
3425 bool begin_dad = false;
3426
3427 spin_lock_bh(&ifp->state_lock);
3428 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3429 ifp->state = INET6_IFADDR_STATE_PREDAD;
3430 begin_dad = true;
3431 }
3432 spin_unlock_bh(&ifp->state_lock);
3433
3434 if (begin_dad)
3435 addrconf_mod_dad_work(ifp, 0);
3436 }
3437
3438 static void addrconf_dad_work(struct work_struct *w)
3439 {
3440 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3441 struct inet6_ifaddr,
3442 dad_work);
3443 struct inet6_dev *idev = ifp->idev;
3444 struct in6_addr mcaddr;
3445
3446 enum {
3447 DAD_PROCESS,
3448 DAD_BEGIN,
3449 DAD_ABORT,
3450 } action = DAD_PROCESS;
3451
3452 rtnl_lock();
3453
3454 spin_lock_bh(&ifp->state_lock);
3455 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3456 action = DAD_BEGIN;
3457 ifp->state = INET6_IFADDR_STATE_DAD;
3458 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3459 action = DAD_ABORT;
3460 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3461 }
3462 spin_unlock_bh(&ifp->state_lock);
3463
3464 if (action == DAD_BEGIN) {
3465 addrconf_dad_begin(ifp);
3466 goto out;
3467 } else if (action == DAD_ABORT) {
3468 addrconf_dad_stop(ifp, 1);
3469 goto out;
3470 }
3471
3472 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3473 goto out;
3474
3475 write_lock_bh(&idev->lock);
3476 if (idev->dead || !(idev->if_flags & IF_READY)) {
3477 write_unlock_bh(&idev->lock);
3478 goto out;
3479 }
3480
3481 spin_lock(&ifp->lock);
3482 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3483 spin_unlock(&ifp->lock);
3484 write_unlock_bh(&idev->lock);
3485 goto out;
3486 }
3487
3488 if (ifp->dad_probes == 0) {
3489 /*
3490 * DAD was successful
3491 */
3492
3493 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3494 spin_unlock(&ifp->lock);
3495 write_unlock_bh(&idev->lock);
3496
3497 addrconf_dad_completed(ifp);
3498
3499 goto out;
3500 }
3501
3502 ifp->dad_probes--;
3503 addrconf_mod_dad_work(ifp,
3504 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3505 spin_unlock(&ifp->lock);
3506 write_unlock_bh(&idev->lock);
3507
3508 /* send a neighbour solicitation for our addr */
3509 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3510 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3511 out:
3512 in6_ifa_put(ifp);
3513 rtnl_unlock();
3514 }
3515
3516 /* ifp->idev must be at least read locked */
3517 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3518 {
3519 struct inet6_ifaddr *ifpiter;
3520 struct inet6_dev *idev = ifp->idev;
3521
3522 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3523 if (ifpiter->scope > IFA_LINK)
3524 break;
3525 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3526 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3527 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3528 IFA_F_PERMANENT)
3529 return false;
3530 }
3531 return true;
3532 }
3533
3534 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3535 {
3536 struct net_device *dev = ifp->idev->dev;
3537 struct in6_addr lladdr;
3538 bool send_rs, send_mld;
3539
3540 addrconf_del_dad_work(ifp);
3541
3542 /*
3543 * Configure the address for reception. Now it is valid.
3544 */
3545
3546 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3547
3548 /* If added prefix is link local and we are prepared to process
3549 router advertisements, start sending router solicitations.
3550 */
3551
3552 read_lock_bh(&ifp->idev->lock);
3553 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3554 send_rs = send_mld &&
3555 ipv6_accept_ra(ifp->idev) &&
3556 ifp->idev->cnf.rtr_solicits > 0 &&
3557 (dev->flags&IFF_LOOPBACK) == 0;
3558 read_unlock_bh(&ifp->idev->lock);
3559
3560 /* While dad is in progress mld report's source address is in6_addrany.
3561 * Resend with proper ll now.
3562 */
3563 if (send_mld)
3564 ipv6_mc_dad_complete(ifp->idev);
3565
3566 if (send_rs) {
3567 /*
3568 * If a host as already performed a random delay
3569 * [...] as part of DAD [...] there is no need
3570 * to delay again before sending the first RS
3571 */
3572 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3573 return;
3574 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3575
3576 write_lock_bh(&ifp->idev->lock);
3577 spin_lock(&ifp->lock);
3578 ifp->idev->rs_probes = 1;
3579 ifp->idev->if_flags |= IF_RS_SENT;
3580 addrconf_mod_rs_timer(ifp->idev,
3581 ifp->idev->cnf.rtr_solicit_interval);
3582 spin_unlock(&ifp->lock);
3583 write_unlock_bh(&ifp->idev->lock);
3584 }
3585 }
3586
3587 static void addrconf_dad_run(struct inet6_dev *idev)
3588 {
3589 struct inet6_ifaddr *ifp;
3590
3591 read_lock_bh(&idev->lock);
3592 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3593 spin_lock(&ifp->lock);
3594 if (ifp->flags & IFA_F_TENTATIVE &&
3595 ifp->state == INET6_IFADDR_STATE_DAD)
3596 addrconf_dad_kick(ifp);
3597 spin_unlock(&ifp->lock);
3598 }
3599 read_unlock_bh(&idev->lock);
3600 }
3601
3602 #ifdef CONFIG_PROC_FS
3603 struct if6_iter_state {
3604 struct seq_net_private p;
3605 int bucket;
3606 int offset;
3607 };
3608
3609 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3610 {
3611 struct inet6_ifaddr *ifa = NULL;
3612 struct if6_iter_state *state = seq->private;
3613 struct net *net = seq_file_net(seq);
3614 int p = 0;
3615
3616 /* initial bucket if pos is 0 */
3617 if (pos == 0) {
3618 state->bucket = 0;
3619 state->offset = 0;
3620 }
3621
3622 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3623 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3624 addr_lst) {
3625 if (!net_eq(dev_net(ifa->idev->dev), net))
3626 continue;
3627 /* sync with offset */
3628 if (p < state->offset) {
3629 p++;
3630 continue;
3631 }
3632 state->offset++;
3633 return ifa;
3634 }
3635
3636 /* prepare for next bucket */
3637 state->offset = 0;
3638 p = 0;
3639 }
3640 return NULL;
3641 }
3642
3643 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3644 struct inet6_ifaddr *ifa)
3645 {
3646 struct if6_iter_state *state = seq->private;
3647 struct net *net = seq_file_net(seq);
3648
3649 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3650 if (!net_eq(dev_net(ifa->idev->dev), net))
3651 continue;
3652 state->offset++;
3653 return ifa;
3654 }
3655
3656 while (++state->bucket < IN6_ADDR_HSIZE) {
3657 state->offset = 0;
3658 hlist_for_each_entry_rcu_bh(ifa,
3659 &inet6_addr_lst[state->bucket], addr_lst) {
3660 if (!net_eq(dev_net(ifa->idev->dev), net))
3661 continue;
3662 state->offset++;
3663 return ifa;
3664 }
3665 }
3666
3667 return NULL;
3668 }
3669
3670 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3671 __acquires(rcu_bh)
3672 {
3673 rcu_read_lock_bh();
3674 return if6_get_first(seq, *pos);
3675 }
3676
3677 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3678 {
3679 struct inet6_ifaddr *ifa;
3680
3681 ifa = if6_get_next(seq, v);
3682 ++*pos;
3683 return ifa;
3684 }
3685
3686 static void if6_seq_stop(struct seq_file *seq, void *v)
3687 __releases(rcu_bh)
3688 {
3689 rcu_read_unlock_bh();
3690 }
3691
3692 static int if6_seq_show(struct seq_file *seq, void *v)
3693 {
3694 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3695 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3696 &ifp->addr,
3697 ifp->idev->dev->ifindex,
3698 ifp->prefix_len,
3699 ifp->scope,
3700 (u8) ifp->flags,
3701 ifp->idev->dev->name);
3702 return 0;
3703 }
3704
3705 static const struct seq_operations if6_seq_ops = {
3706 .start = if6_seq_start,
3707 .next = if6_seq_next,
3708 .show = if6_seq_show,
3709 .stop = if6_seq_stop,
3710 };
3711
3712 static int if6_seq_open(struct inode *inode, struct file *file)
3713 {
3714 return seq_open_net(inode, file, &if6_seq_ops,
3715 sizeof(struct if6_iter_state));
3716 }
3717
3718 static const struct file_operations if6_fops = {
3719 .owner = THIS_MODULE,
3720 .open = if6_seq_open,
3721 .read = seq_read,
3722 .llseek = seq_lseek,
3723 .release = seq_release_net,
3724 };
3725
3726 static int __net_init if6_proc_net_init(struct net *net)
3727 {
3728 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3729 return -ENOMEM;
3730 return 0;
3731 }
3732
3733 static void __net_exit if6_proc_net_exit(struct net *net)
3734 {
3735 remove_proc_entry("if_inet6", net->proc_net);
3736 }
3737
3738 static struct pernet_operations if6_proc_net_ops = {
3739 .init = if6_proc_net_init,
3740 .exit = if6_proc_net_exit,
3741 };
3742
3743 int __init if6_proc_init(void)
3744 {
3745 return register_pernet_subsys(&if6_proc_net_ops);
3746 }
3747
3748 void if6_proc_exit(void)
3749 {
3750 unregister_pernet_subsys(&if6_proc_net_ops);
3751 }
3752 #endif /* CONFIG_PROC_FS */
3753
3754 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3755 /* Check if address is a home address configured on any interface. */
3756 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3757 {
3758 int ret = 0;
3759 struct inet6_ifaddr *ifp = NULL;
3760 unsigned int hash = inet6_addr_hash(addr);
3761
3762 rcu_read_lock_bh();
3763 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3764 if (!net_eq(dev_net(ifp->idev->dev), net))
3765 continue;
3766 if (ipv6_addr_equal(&ifp->addr, addr) &&
3767 (ifp->flags & IFA_F_HOMEADDRESS)) {
3768 ret = 1;
3769 break;
3770 }
3771 }
3772 rcu_read_unlock_bh();
3773 return ret;
3774 }
3775 #endif
3776
3777 /*
3778 * Periodic address status verification
3779 */
3780
3781 static void addrconf_verify_rtnl(void)
3782 {
3783 unsigned long now, next, next_sec, next_sched;
3784 struct inet6_ifaddr *ifp;
3785 int i;
3786
3787 ASSERT_RTNL();
3788
3789 rcu_read_lock_bh();
3790 now = jiffies;
3791 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3792
3793 cancel_delayed_work(&addr_chk_work);
3794
3795 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3796 restart:
3797 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3798 unsigned long age;
3799
3800 /* When setting preferred_lft to a value not zero or
3801 * infinity, while valid_lft is infinity
3802 * IFA_F_PERMANENT has a non-infinity life time.
3803 */
3804 if ((ifp->flags & IFA_F_PERMANENT) &&
3805 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3806 continue;
3807
3808 spin_lock(&ifp->lock);
3809 /* We try to batch several events at once. */
3810 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3811
3812 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3813 age >= ifp->valid_lft) {
3814 spin_unlock(&ifp->lock);
3815 in6_ifa_hold(ifp);
3816 ipv6_del_addr(ifp);
3817 goto restart;
3818 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3819 spin_unlock(&ifp->lock);
3820 continue;
3821 } else if (age >= ifp->prefered_lft) {
3822 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3823 int deprecate = 0;
3824
3825 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3826 deprecate = 1;
3827 ifp->flags |= IFA_F_DEPRECATED;
3828 }
3829
3830 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3831 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3832 next = ifp->tstamp + ifp->valid_lft * HZ;
3833
3834 spin_unlock(&ifp->lock);
3835
3836 if (deprecate) {
3837 in6_ifa_hold(ifp);
3838
3839 ipv6_ifa_notify(0, ifp);
3840 in6_ifa_put(ifp);
3841 goto restart;
3842 }
3843 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3844 !(ifp->flags&IFA_F_TENTATIVE)) {
3845 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3846 ifp->idev->cnf.dad_transmits *
3847 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3848
3849 if (age >= ifp->prefered_lft - regen_advance) {
3850 struct inet6_ifaddr *ifpub = ifp->ifpub;
3851 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3852 next = ifp->tstamp + ifp->prefered_lft * HZ;
3853 if (!ifp->regen_count && ifpub) {
3854 ifp->regen_count++;
3855 in6_ifa_hold(ifp);
3856 in6_ifa_hold(ifpub);
3857 spin_unlock(&ifp->lock);
3858
3859 spin_lock(&ifpub->lock);
3860 ifpub->regen_count = 0;
3861 spin_unlock(&ifpub->lock);
3862 ipv6_create_tempaddr(ifpub, ifp);
3863 in6_ifa_put(ifpub);
3864 in6_ifa_put(ifp);
3865 goto restart;
3866 }
3867 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3868 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3869 spin_unlock(&ifp->lock);
3870 } else {
3871 /* ifp->prefered_lft <= ifp->valid_lft */
3872 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3873 next = ifp->tstamp + ifp->prefered_lft * HZ;
3874 spin_unlock(&ifp->lock);
3875 }
3876 }
3877 }
3878
3879 next_sec = round_jiffies_up(next);
3880 next_sched = next;
3881
3882 /* If rounded timeout is accurate enough, accept it. */
3883 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3884 next_sched = next_sec;
3885
3886 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3887 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3888 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3889
3890 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3891 now, next, next_sec, next_sched);
3892 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
3893 rcu_read_unlock_bh();
3894 }
3895
3896 static void addrconf_verify_work(struct work_struct *w)
3897 {
3898 rtnl_lock();
3899 addrconf_verify_rtnl();
3900 rtnl_unlock();
3901 }
3902
3903 static void addrconf_verify(void)
3904 {
3905 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3906 }
3907
3908 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3909 struct in6_addr **peer_pfx)
3910 {
3911 struct in6_addr *pfx = NULL;
3912
3913 *peer_pfx = NULL;
3914
3915 if (addr)
3916 pfx = nla_data(addr);
3917
3918 if (local) {
3919 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3920 *peer_pfx = pfx;
3921 pfx = nla_data(local);
3922 }
3923
3924 return pfx;
3925 }
3926
3927 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3928 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3929 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3930 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3931 [IFA_FLAGS] = { .len = sizeof(u32) },
3932 };
3933
3934 static int
3935 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3936 {
3937 struct net *net = sock_net(skb->sk);
3938 struct ifaddrmsg *ifm;
3939 struct nlattr *tb[IFA_MAX+1];
3940 struct in6_addr *pfx, *peer_pfx;
3941 u32 ifa_flags;
3942 int err;
3943
3944 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3945 if (err < 0)
3946 return err;
3947
3948 ifm = nlmsg_data(nlh);
3949 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3950 if (pfx == NULL)
3951 return -EINVAL;
3952
3953 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3954
3955 /* We ignore other flags so far. */
3956 ifa_flags &= IFA_F_MANAGETEMPADDR;
3957
3958 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
3959 ifm->ifa_prefixlen);
3960 }
3961
3962 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
3963 u32 prefered_lft, u32 valid_lft)
3964 {
3965 u32 flags;
3966 clock_t expires;
3967 unsigned long timeout;
3968 bool was_managetempaddr;
3969 bool had_prefixroute;
3970
3971 ASSERT_RTNL();
3972
3973 if (!valid_lft || (prefered_lft > valid_lft))
3974 return -EINVAL;
3975
3976 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3977 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3978 return -EINVAL;
3979
3980 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3981 if (addrconf_finite_timeout(timeout)) {
3982 expires = jiffies_to_clock_t(timeout * HZ);
3983 valid_lft = timeout;
3984 flags = RTF_EXPIRES;
3985 } else {
3986 expires = 0;
3987 flags = 0;
3988 ifa_flags |= IFA_F_PERMANENT;
3989 }
3990
3991 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3992 if (addrconf_finite_timeout(timeout)) {
3993 if (timeout == 0)
3994 ifa_flags |= IFA_F_DEPRECATED;
3995 prefered_lft = timeout;
3996 }
3997
3998 spin_lock_bh(&ifp->lock);
3999 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4000 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4001 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4002 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4003 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4004 IFA_F_NOPREFIXROUTE);
4005 ifp->flags |= ifa_flags;
4006 ifp->tstamp = jiffies;
4007 ifp->valid_lft = valid_lft;
4008 ifp->prefered_lft = prefered_lft;
4009
4010 spin_unlock_bh(&ifp->lock);
4011 if (!(ifp->flags&IFA_F_TENTATIVE))
4012 ipv6_ifa_notify(0, ifp);
4013
4014 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4015 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4016 expires, flags);
4017 } else if (had_prefixroute) {
4018 enum cleanup_prefix_rt_t action;
4019 unsigned long rt_expires;
4020
4021 write_lock_bh(&ifp->idev->lock);
4022 action = check_cleanup_prefix_route(ifp, &rt_expires);
4023 write_unlock_bh(&ifp->idev->lock);
4024
4025 if (action != CLEANUP_PREFIX_RT_NOP) {
4026 cleanup_prefix_route(ifp, rt_expires,
4027 action == CLEANUP_PREFIX_RT_DEL);
4028 }
4029 }
4030
4031 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4032 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4033 valid_lft = prefered_lft = 0;
4034 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4035 !was_managetempaddr, jiffies);
4036 }
4037
4038 addrconf_verify_rtnl();
4039
4040 return 0;
4041 }
4042
4043 static int
4044 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4045 {
4046 struct net *net = sock_net(skb->sk);
4047 struct ifaddrmsg *ifm;
4048 struct nlattr *tb[IFA_MAX+1];
4049 struct in6_addr *pfx, *peer_pfx;
4050 struct inet6_ifaddr *ifa;
4051 struct net_device *dev;
4052 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4053 u32 ifa_flags;
4054 int err;
4055
4056 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4057 if (err < 0)
4058 return err;
4059
4060 ifm = nlmsg_data(nlh);
4061 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4062 if (pfx == NULL)
4063 return -EINVAL;
4064
4065 if (tb[IFA_CACHEINFO]) {
4066 struct ifa_cacheinfo *ci;
4067
4068 ci = nla_data(tb[IFA_CACHEINFO]);
4069 valid_lft = ci->ifa_valid;
4070 preferred_lft = ci->ifa_prefered;
4071 } else {
4072 preferred_lft = INFINITY_LIFE_TIME;
4073 valid_lft = INFINITY_LIFE_TIME;
4074 }
4075
4076 dev = __dev_get_by_index(net, ifm->ifa_index);
4077 if (dev == NULL)
4078 return -ENODEV;
4079
4080 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4081
4082 /* We ignore other flags so far. */
4083 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4084 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4085
4086 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4087 if (ifa == NULL) {
4088 /*
4089 * It would be best to check for !NLM_F_CREATE here but
4090 * userspace already relies on not having to provide this.
4091 */
4092 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4093 ifm->ifa_prefixlen, ifa_flags,
4094 preferred_lft, valid_lft);
4095 }
4096
4097 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4098 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4099 err = -EEXIST;
4100 else
4101 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4102
4103 in6_ifa_put(ifa);
4104
4105 return err;
4106 }
4107
4108 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4109 u8 scope, int ifindex)
4110 {
4111 struct ifaddrmsg *ifm;
4112
4113 ifm = nlmsg_data(nlh);
4114 ifm->ifa_family = AF_INET6;
4115 ifm->ifa_prefixlen = prefixlen;
4116 ifm->ifa_flags = flags;
4117 ifm->ifa_scope = scope;
4118 ifm->ifa_index = ifindex;
4119 }
4120
4121 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4122 unsigned long tstamp, u32 preferred, u32 valid)
4123 {
4124 struct ifa_cacheinfo ci;
4125
4126 ci.cstamp = cstamp_delta(cstamp);
4127 ci.tstamp = cstamp_delta(tstamp);
4128 ci.ifa_prefered = preferred;
4129 ci.ifa_valid = valid;
4130
4131 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4132 }
4133
4134 static inline int rt_scope(int ifa_scope)
4135 {
4136 if (ifa_scope & IFA_HOST)
4137 return RT_SCOPE_HOST;
4138 else if (ifa_scope & IFA_LINK)
4139 return RT_SCOPE_LINK;
4140 else if (ifa_scope & IFA_SITE)
4141 return RT_SCOPE_SITE;
4142 else
4143 return RT_SCOPE_UNIVERSE;
4144 }
4145
4146 static inline int inet6_ifaddr_msgsize(void)
4147 {
4148 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4149 + nla_total_size(16) /* IFA_LOCAL */
4150 + nla_total_size(16) /* IFA_ADDRESS */
4151 + nla_total_size(sizeof(struct ifa_cacheinfo))
4152 + nla_total_size(4) /* IFA_FLAGS */;
4153 }
4154
4155 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4156 u32 portid, u32 seq, int event, unsigned int flags)
4157 {
4158 struct nlmsghdr *nlh;
4159 u32 preferred, valid;
4160
4161 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4162 if (nlh == NULL)
4163 return -EMSGSIZE;
4164
4165 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4166 ifa->idev->dev->ifindex);
4167
4168 if (!((ifa->flags&IFA_F_PERMANENT) &&
4169 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4170 preferred = ifa->prefered_lft;
4171 valid = ifa->valid_lft;
4172 if (preferred != INFINITY_LIFE_TIME) {
4173 long tval = (jiffies - ifa->tstamp)/HZ;
4174 if (preferred > tval)
4175 preferred -= tval;
4176 else
4177 preferred = 0;
4178 if (valid != INFINITY_LIFE_TIME) {
4179 if (valid > tval)
4180 valid -= tval;
4181 else
4182 valid = 0;
4183 }
4184 }
4185 } else {
4186 preferred = INFINITY_LIFE_TIME;
4187 valid = INFINITY_LIFE_TIME;
4188 }
4189
4190 if (!ipv6_addr_any(&ifa->peer_addr)) {
4191 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
4192 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
4193 goto error;
4194 } else
4195 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
4196 goto error;
4197
4198 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4199 goto error;
4200
4201 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4202 goto error;
4203
4204 nlmsg_end(skb, nlh);
4205 return 0;
4206
4207 error:
4208 nlmsg_cancel(skb, nlh);
4209 return -EMSGSIZE;
4210 }
4211
4212 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4213 u32 portid, u32 seq, int event, u16 flags)
4214 {
4215 struct nlmsghdr *nlh;
4216 u8 scope = RT_SCOPE_UNIVERSE;
4217 int ifindex = ifmca->idev->dev->ifindex;
4218
4219 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4220 scope = RT_SCOPE_SITE;
4221
4222 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4223 if (nlh == NULL)
4224 return -EMSGSIZE;
4225
4226 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4227 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
4228 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4229 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4230 nlmsg_cancel(skb, nlh);
4231 return -EMSGSIZE;
4232 }
4233
4234 nlmsg_end(skb, nlh);
4235 return 0;
4236 }
4237
4238 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4239 u32 portid, u32 seq, int event, unsigned int flags)
4240 {
4241 struct nlmsghdr *nlh;
4242 u8 scope = RT_SCOPE_UNIVERSE;
4243 int ifindex = ifaca->aca_idev->dev->ifindex;
4244
4245 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4246 scope = RT_SCOPE_SITE;
4247
4248 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4249 if (nlh == NULL)
4250 return -EMSGSIZE;
4251
4252 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4253 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
4254 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4255 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4256 nlmsg_cancel(skb, nlh);
4257 return -EMSGSIZE;
4258 }
4259
4260 nlmsg_end(skb, nlh);
4261 return 0;
4262 }
4263
4264 enum addr_type_t {
4265 UNICAST_ADDR,
4266 MULTICAST_ADDR,
4267 ANYCAST_ADDR,
4268 };
4269
4270 /* called with rcu_read_lock() */
4271 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4272 struct netlink_callback *cb, enum addr_type_t type,
4273 int s_ip_idx, int *p_ip_idx)
4274 {
4275 struct ifmcaddr6 *ifmca;
4276 struct ifacaddr6 *ifaca;
4277 int err = 1;
4278 int ip_idx = *p_ip_idx;
4279
4280 read_lock_bh(&idev->lock);
4281 switch (type) {
4282 case UNICAST_ADDR: {
4283 struct inet6_ifaddr *ifa;
4284
4285 /* unicast address incl. temp addr */
4286 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4287 if (++ip_idx < s_ip_idx)
4288 continue;
4289 err = inet6_fill_ifaddr(skb, ifa,
4290 NETLINK_CB(cb->skb).portid,
4291 cb->nlh->nlmsg_seq,
4292 RTM_NEWADDR,
4293 NLM_F_MULTI);
4294 if (err < 0)
4295 break;
4296 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4297 }
4298 break;
4299 }
4300 case MULTICAST_ADDR:
4301 /* multicast address */
4302 for (ifmca = idev->mc_list; ifmca;
4303 ifmca = ifmca->next, ip_idx++) {
4304 if (ip_idx < s_ip_idx)
4305 continue;
4306 err = inet6_fill_ifmcaddr(skb, ifmca,
4307 NETLINK_CB(cb->skb).portid,
4308 cb->nlh->nlmsg_seq,
4309 RTM_GETMULTICAST,
4310 NLM_F_MULTI);
4311 if (err < 0)
4312 break;
4313 }
4314 break;
4315 case ANYCAST_ADDR:
4316 /* anycast address */
4317 for (ifaca = idev->ac_list; ifaca;
4318 ifaca = ifaca->aca_next, ip_idx++) {
4319 if (ip_idx < s_ip_idx)
4320 continue;
4321 err = inet6_fill_ifacaddr(skb, ifaca,
4322 NETLINK_CB(cb->skb).portid,
4323 cb->nlh->nlmsg_seq,
4324 RTM_GETANYCAST,
4325 NLM_F_MULTI);
4326 if (err < 0)
4327 break;
4328 }
4329 break;
4330 default:
4331 break;
4332 }
4333 read_unlock_bh(&idev->lock);
4334 *p_ip_idx = ip_idx;
4335 return err;
4336 }
4337
4338 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4339 enum addr_type_t type)
4340 {
4341 struct net *net = sock_net(skb->sk);
4342 int h, s_h;
4343 int idx, ip_idx;
4344 int s_idx, s_ip_idx;
4345 struct net_device *dev;
4346 struct inet6_dev *idev;
4347 struct hlist_head *head;
4348
4349 s_h = cb->args[0];
4350 s_idx = idx = cb->args[1];
4351 s_ip_idx = ip_idx = cb->args[2];
4352
4353 rcu_read_lock();
4354 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4355 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4356 idx = 0;
4357 head = &net->dev_index_head[h];
4358 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4359 if (idx < s_idx)
4360 goto cont;
4361 if (h > s_h || idx > s_idx)
4362 s_ip_idx = 0;
4363 ip_idx = 0;
4364 idev = __in6_dev_get(dev);
4365 if (!idev)
4366 goto cont;
4367
4368 if (in6_dump_addrs(idev, skb, cb, type,
4369 s_ip_idx, &ip_idx) < 0)
4370 goto done;
4371 cont:
4372 idx++;
4373 }
4374 }
4375 done:
4376 rcu_read_unlock();
4377 cb->args[0] = h;
4378 cb->args[1] = idx;
4379 cb->args[2] = ip_idx;
4380
4381 return skb->len;
4382 }
4383
4384 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4385 {
4386 enum addr_type_t type = UNICAST_ADDR;
4387
4388 return inet6_dump_addr(skb, cb, type);
4389 }
4390
4391 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4392 {
4393 enum addr_type_t type = MULTICAST_ADDR;
4394
4395 return inet6_dump_addr(skb, cb, type);
4396 }
4397
4398
4399 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4400 {
4401 enum addr_type_t type = ANYCAST_ADDR;
4402
4403 return inet6_dump_addr(skb, cb, type);
4404 }
4405
4406 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4407 {
4408 struct net *net = sock_net(in_skb->sk);
4409 struct ifaddrmsg *ifm;
4410 struct nlattr *tb[IFA_MAX+1];
4411 struct in6_addr *addr = NULL, *peer;
4412 struct net_device *dev = NULL;
4413 struct inet6_ifaddr *ifa;
4414 struct sk_buff *skb;
4415 int err;
4416
4417 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4418 if (err < 0)
4419 goto errout;
4420
4421 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4422 if (addr == NULL) {
4423 err = -EINVAL;
4424 goto errout;
4425 }
4426
4427 ifm = nlmsg_data(nlh);
4428 if (ifm->ifa_index)
4429 dev = __dev_get_by_index(net, ifm->ifa_index);
4430
4431 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4432 if (!ifa) {
4433 err = -EADDRNOTAVAIL;
4434 goto errout;
4435 }
4436
4437 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4438 if (!skb) {
4439 err = -ENOBUFS;
4440 goto errout_ifa;
4441 }
4442
4443 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4444 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4445 if (err < 0) {
4446 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4447 WARN_ON(err == -EMSGSIZE);
4448 kfree_skb(skb);
4449 goto errout_ifa;
4450 }
4451 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4452 errout_ifa:
4453 in6_ifa_put(ifa);
4454 errout:
4455 return err;
4456 }
4457
4458 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4459 {
4460 struct sk_buff *skb;
4461 struct net *net = dev_net(ifa->idev->dev);
4462 int err = -ENOBUFS;
4463
4464 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4465 if (skb == NULL)
4466 goto errout;
4467
4468 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4469 if (err < 0) {
4470 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4471 WARN_ON(err == -EMSGSIZE);
4472 kfree_skb(skb);
4473 goto errout;
4474 }
4475 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4476 return;
4477 errout:
4478 if (err < 0)
4479 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4480 }
4481
4482 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4483 __s32 *array, int bytes)
4484 {
4485 BUG_ON(bytes < (DEVCONF_MAX * 4));
4486
4487 memset(array, 0, bytes);
4488 array[DEVCONF_FORWARDING] = cnf->forwarding;
4489 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4490 array[DEVCONF_MTU6] = cnf->mtu6;
4491 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4492 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4493 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4494 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4495 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4496 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4497 jiffies_to_msecs(cnf->rtr_solicit_interval);
4498 array[DEVCONF_RTR_SOLICIT_DELAY] =
4499 jiffies_to_msecs(cnf->rtr_solicit_delay);
4500 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4501 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4502 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4503 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4504 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4505 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4506 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4507 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4508 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4509 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4510 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4511 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4512 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4513 #ifdef CONFIG_IPV6_ROUTER_PREF
4514 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4515 array[DEVCONF_RTR_PROBE_INTERVAL] =
4516 jiffies_to_msecs(cnf->rtr_probe_interval);
4517 #ifdef CONFIG_IPV6_ROUTE_INFO
4518 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4519 #endif
4520 #endif
4521 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4522 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4523 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4524 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4525 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4526 #endif
4527 #ifdef CONFIG_IPV6_MROUTE
4528 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4529 #endif
4530 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4531 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4532 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4533 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4534 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4535 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4536 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4537 /* we omit DEVCONF_STABLE_SECRET for now */
4538 }
4539
4540 static inline size_t inet6_ifla6_size(void)
4541 {
4542 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4543 + nla_total_size(sizeof(struct ifla_cacheinfo))
4544 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4545 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4546 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4547 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4548 }
4549
4550 static inline size_t inet6_if_nlmsg_size(void)
4551 {
4552 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4553 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4554 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4555 + nla_total_size(4) /* IFLA_MTU */
4556 + nla_total_size(4) /* IFLA_LINK */
4557 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4558 }
4559
4560 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4561 int items, int bytes)
4562 {
4563 int i;
4564 int pad = bytes - sizeof(u64) * items;
4565 BUG_ON(pad < 0);
4566
4567 /* Use put_unaligned() because stats may not be aligned for u64. */
4568 put_unaligned(items, &stats[0]);
4569 for (i = 1; i < items; i++)
4570 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4571
4572 memset(&stats[items], 0, pad);
4573 }
4574
4575 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4576 int items, int bytes, size_t syncpoff)
4577 {
4578 int i;
4579 int pad = bytes - sizeof(u64) * items;
4580 BUG_ON(pad < 0);
4581
4582 /* Use put_unaligned() because stats may not be aligned for u64. */
4583 put_unaligned(items, &stats[0]);
4584 for (i = 1; i < items; i++)
4585 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4586
4587 memset(&stats[items], 0, pad);
4588 }
4589
4590 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4591 int bytes)
4592 {
4593 switch (attrtype) {
4594 case IFLA_INET6_STATS:
4595 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4596 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4597 break;
4598 case IFLA_INET6_ICMP6STATS:
4599 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4600 break;
4601 }
4602 }
4603
4604 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4605 {
4606 struct nlattr *nla;
4607 struct ifla_cacheinfo ci;
4608
4609 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4610 goto nla_put_failure;
4611 ci.max_reasm_len = IPV6_MAXPLEN;
4612 ci.tstamp = cstamp_delta(idev->tstamp);
4613 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4614 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4615 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4616 goto nla_put_failure;
4617 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4618 if (nla == NULL)
4619 goto nla_put_failure;
4620 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4621
4622 /* XXX - MC not implemented */
4623
4624 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4625 if (nla == NULL)
4626 goto nla_put_failure;
4627 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4628
4629 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4630 if (nla == NULL)
4631 goto nla_put_failure;
4632 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4633
4634 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4635 if (nla == NULL)
4636 goto nla_put_failure;
4637
4638 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4639 goto nla_put_failure;
4640
4641 read_lock_bh(&idev->lock);
4642 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4643 read_unlock_bh(&idev->lock);
4644
4645 return 0;
4646
4647 nla_put_failure:
4648 return -EMSGSIZE;
4649 }
4650
4651 static size_t inet6_get_link_af_size(const struct net_device *dev)
4652 {
4653 if (!__in6_dev_get(dev))
4654 return 0;
4655
4656 return inet6_ifla6_size();
4657 }
4658
4659 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4660 {
4661 struct inet6_dev *idev = __in6_dev_get(dev);
4662
4663 if (!idev)
4664 return -ENODATA;
4665
4666 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4667 return -EMSGSIZE;
4668
4669 return 0;
4670 }
4671
4672 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4673 {
4674 struct inet6_ifaddr *ifp;
4675 struct net_device *dev = idev->dev;
4676 bool update_rs = false;
4677 struct in6_addr ll_addr;
4678
4679 ASSERT_RTNL();
4680
4681 if (token == NULL)
4682 return -EINVAL;
4683 if (ipv6_addr_any(token))
4684 return -EINVAL;
4685 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4686 return -EINVAL;
4687 if (!ipv6_accept_ra(idev))
4688 return -EINVAL;
4689 if (idev->cnf.rtr_solicits <= 0)
4690 return -EINVAL;
4691
4692 write_lock_bh(&idev->lock);
4693
4694 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4695 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4696
4697 write_unlock_bh(&idev->lock);
4698
4699 if (!idev->dead && (idev->if_flags & IF_READY) &&
4700 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4701 IFA_F_OPTIMISTIC)) {
4702
4703 /* If we're not ready, then normal ifup will take care
4704 * of this. Otherwise, we need to request our rs here.
4705 */
4706 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4707 update_rs = true;
4708 }
4709
4710 write_lock_bh(&idev->lock);
4711
4712 if (update_rs) {
4713 idev->if_flags |= IF_RS_SENT;
4714 idev->rs_probes = 1;
4715 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4716 }
4717
4718 /* Well, that's kinda nasty ... */
4719 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4720 spin_lock(&ifp->lock);
4721 if (ifp->tokenized) {
4722 ifp->valid_lft = 0;
4723 ifp->prefered_lft = 0;
4724 }
4725 spin_unlock(&ifp->lock);
4726 }
4727
4728 write_unlock_bh(&idev->lock);
4729 inet6_ifinfo_notify(RTM_NEWLINK, idev);
4730 addrconf_verify_rtnl();
4731 return 0;
4732 }
4733
4734 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4735 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4736 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4737 };
4738
4739 static int inet6_validate_link_af(const struct net_device *dev,
4740 const struct nlattr *nla)
4741 {
4742 struct nlattr *tb[IFLA_INET6_MAX + 1];
4743
4744 if (dev && !__in6_dev_get(dev))
4745 return -EAFNOSUPPORT;
4746
4747 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4748 }
4749
4750 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4751 {
4752 int err = -EINVAL;
4753 struct inet6_dev *idev = __in6_dev_get(dev);
4754 struct nlattr *tb[IFLA_INET6_MAX + 1];
4755
4756 if (!idev)
4757 return -EAFNOSUPPORT;
4758
4759 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4760 BUG();
4761
4762 if (tb[IFLA_INET6_TOKEN]) {
4763 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4764 if (err)
4765 return err;
4766 }
4767
4768 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4769 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4770
4771 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4772 mode != IN6_ADDR_GEN_MODE_NONE &&
4773 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4774 return -EINVAL;
4775
4776 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4777 !idev->cnf.stable_secret.initialized &&
4778 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4779 return -EINVAL;
4780
4781 idev->addr_gen_mode = mode;
4782 err = 0;
4783 }
4784
4785 return err;
4786 }
4787
4788 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4789 u32 portid, u32 seq, int event, unsigned int flags)
4790 {
4791 struct net_device *dev = idev->dev;
4792 struct ifinfomsg *hdr;
4793 struct nlmsghdr *nlh;
4794 void *protoinfo;
4795
4796 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4797 if (nlh == NULL)
4798 return -EMSGSIZE;
4799
4800 hdr = nlmsg_data(nlh);
4801 hdr->ifi_family = AF_INET6;
4802 hdr->__ifi_pad = 0;
4803 hdr->ifi_type = dev->type;
4804 hdr->ifi_index = dev->ifindex;
4805 hdr->ifi_flags = dev_get_flags(dev);
4806 hdr->ifi_change = 0;
4807
4808 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4809 (dev->addr_len &&
4810 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4811 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4812 (dev->ifindex != dev->iflink &&
4813 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4814 goto nla_put_failure;
4815 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4816 if (protoinfo == NULL)
4817 goto nla_put_failure;
4818
4819 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4820 goto nla_put_failure;
4821
4822 nla_nest_end(skb, protoinfo);
4823 nlmsg_end(skb, nlh);
4824 return 0;
4825
4826 nla_put_failure:
4827 nlmsg_cancel(skb, nlh);
4828 return -EMSGSIZE;
4829 }
4830
4831 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4832 {
4833 struct net *net = sock_net(skb->sk);
4834 int h, s_h;
4835 int idx = 0, s_idx;
4836 struct net_device *dev;
4837 struct inet6_dev *idev;
4838 struct hlist_head *head;
4839
4840 s_h = cb->args[0];
4841 s_idx = cb->args[1];
4842
4843 rcu_read_lock();
4844 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4845 idx = 0;
4846 head = &net->dev_index_head[h];
4847 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4848 if (idx < s_idx)
4849 goto cont;
4850 idev = __in6_dev_get(dev);
4851 if (!idev)
4852 goto cont;
4853 if (inet6_fill_ifinfo(skb, idev,
4854 NETLINK_CB(cb->skb).portid,
4855 cb->nlh->nlmsg_seq,
4856 RTM_NEWLINK, NLM_F_MULTI) < 0)
4857 goto out;
4858 cont:
4859 idx++;
4860 }
4861 }
4862 out:
4863 rcu_read_unlock();
4864 cb->args[1] = idx;
4865 cb->args[0] = h;
4866
4867 return skb->len;
4868 }
4869
4870 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4871 {
4872 struct sk_buff *skb;
4873 struct net *net = dev_net(idev->dev);
4874 int err = -ENOBUFS;
4875
4876 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4877 if (skb == NULL)
4878 goto errout;
4879
4880 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4881 if (err < 0) {
4882 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4883 WARN_ON(err == -EMSGSIZE);
4884 kfree_skb(skb);
4885 goto errout;
4886 }
4887 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4888 return;
4889 errout:
4890 if (err < 0)
4891 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4892 }
4893
4894 static inline size_t inet6_prefix_nlmsg_size(void)
4895 {
4896 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4897 + nla_total_size(sizeof(struct in6_addr))
4898 + nla_total_size(sizeof(struct prefix_cacheinfo));
4899 }
4900
4901 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4902 struct prefix_info *pinfo, u32 portid, u32 seq,
4903 int event, unsigned int flags)
4904 {
4905 struct prefixmsg *pmsg;
4906 struct nlmsghdr *nlh;
4907 struct prefix_cacheinfo ci;
4908
4909 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4910 if (nlh == NULL)
4911 return -EMSGSIZE;
4912
4913 pmsg = nlmsg_data(nlh);
4914 pmsg->prefix_family = AF_INET6;
4915 pmsg->prefix_pad1 = 0;
4916 pmsg->prefix_pad2 = 0;
4917 pmsg->prefix_ifindex = idev->dev->ifindex;
4918 pmsg->prefix_len = pinfo->prefix_len;
4919 pmsg->prefix_type = pinfo->type;
4920 pmsg->prefix_pad3 = 0;
4921 pmsg->prefix_flags = 0;
4922 if (pinfo->onlink)
4923 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4924 if (pinfo->autoconf)
4925 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4926
4927 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4928 goto nla_put_failure;
4929 ci.preferred_time = ntohl(pinfo->prefered);
4930 ci.valid_time = ntohl(pinfo->valid);
4931 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4932 goto nla_put_failure;
4933 nlmsg_end(skb, nlh);
4934 return 0;
4935
4936 nla_put_failure:
4937 nlmsg_cancel(skb, nlh);
4938 return -EMSGSIZE;
4939 }
4940
4941 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4942 struct prefix_info *pinfo)
4943 {
4944 struct sk_buff *skb;
4945 struct net *net = dev_net(idev->dev);
4946 int err = -ENOBUFS;
4947
4948 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4949 if (skb == NULL)
4950 goto errout;
4951
4952 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4953 if (err < 0) {
4954 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4955 WARN_ON(err == -EMSGSIZE);
4956 kfree_skb(skb);
4957 goto errout;
4958 }
4959 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4960 return;
4961 errout:
4962 if (err < 0)
4963 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4964 }
4965
4966 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4967 {
4968 struct net *net = dev_net(ifp->idev->dev);
4969
4970 if (event)
4971 ASSERT_RTNL();
4972
4973 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4974
4975 switch (event) {
4976 case RTM_NEWADDR:
4977 /*
4978 * If the address was optimistic
4979 * we inserted the route at the start of
4980 * our DAD process, so we don't need
4981 * to do it again
4982 */
4983 if (!(ifp->rt->rt6i_node))
4984 ip6_ins_rt(ifp->rt);
4985 if (ifp->idev->cnf.forwarding)
4986 addrconf_join_anycast(ifp);
4987 if (!ipv6_addr_any(&ifp->peer_addr))
4988 addrconf_prefix_route(&ifp->peer_addr, 128,
4989 ifp->idev->dev, 0, 0);
4990 break;
4991 case RTM_DELADDR:
4992 if (ifp->idev->cnf.forwarding)
4993 addrconf_leave_anycast(ifp);
4994 addrconf_leave_solict(ifp->idev, &ifp->addr);
4995 if (!ipv6_addr_any(&ifp->peer_addr)) {
4996 struct rt6_info *rt;
4997
4998 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
4999 ifp->idev->dev, 0, 0);
5000 if (rt && ip6_del_rt(rt))
5001 dst_free(&rt->dst);
5002 }
5003 dst_hold(&ifp->rt->dst);
5004
5005 if (ip6_del_rt(ifp->rt))
5006 dst_free(&ifp->rt->dst);
5007
5008 rt_genid_bump_ipv6(net);
5009 break;
5010 }
5011 atomic_inc(&net->ipv6.dev_addr_genid);
5012 }
5013
5014 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5015 {
5016 rcu_read_lock_bh();
5017 if (likely(ifp->idev->dead == 0))
5018 __ipv6_ifa_notify(event, ifp);
5019 rcu_read_unlock_bh();
5020 }
5021
5022 #ifdef CONFIG_SYSCTL
5023
5024 static
5025 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5026 void __user *buffer, size_t *lenp, loff_t *ppos)
5027 {
5028 int *valp = ctl->data;
5029 int val = *valp;
5030 loff_t pos = *ppos;
5031 struct ctl_table lctl;
5032 int ret;
5033
5034 /*
5035 * ctl->data points to idev->cnf.forwarding, we should
5036 * not modify it until we get the rtnl lock.
5037 */
5038 lctl = *ctl;
5039 lctl.data = &val;
5040
5041 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5042
5043 if (write)
5044 ret = addrconf_fixup_forwarding(ctl, valp, val);
5045 if (ret)
5046 *ppos = pos;
5047 return ret;
5048 }
5049
5050 static
5051 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5052 void __user *buffer, size_t *lenp, loff_t *ppos)
5053 {
5054 struct inet6_dev *idev = ctl->extra1;
5055 int min_mtu = IPV6_MIN_MTU;
5056 struct ctl_table lctl;
5057
5058 lctl = *ctl;
5059 lctl.extra1 = &min_mtu;
5060 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5061
5062 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5063 }
5064
5065 static void dev_disable_change(struct inet6_dev *idev)
5066 {
5067 struct netdev_notifier_info info;
5068
5069 if (!idev || !idev->dev)
5070 return;
5071
5072 netdev_notifier_info_init(&info, idev->dev);
5073 if (idev->cnf.disable_ipv6)
5074 addrconf_notify(NULL, NETDEV_DOWN, &info);
5075 else
5076 addrconf_notify(NULL, NETDEV_UP, &info);
5077 }
5078
5079 static void addrconf_disable_change(struct net *net, __s32 newf)
5080 {
5081 struct net_device *dev;
5082 struct inet6_dev *idev;
5083
5084 rcu_read_lock();
5085 for_each_netdev_rcu(net, dev) {
5086 idev = __in6_dev_get(dev);
5087 if (idev) {
5088 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5089 idev->cnf.disable_ipv6 = newf;
5090 if (changed)
5091 dev_disable_change(idev);
5092 }
5093 }
5094 rcu_read_unlock();
5095 }
5096
5097 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5098 {
5099 struct net *net;
5100 int old;
5101
5102 if (!rtnl_trylock())
5103 return restart_syscall();
5104
5105 net = (struct net *)table->extra2;
5106 old = *p;
5107 *p = newf;
5108
5109 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5110 rtnl_unlock();
5111 return 0;
5112 }
5113
5114 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5115 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5116 addrconf_disable_change(net, newf);
5117 } else if ((!newf) ^ (!old))
5118 dev_disable_change((struct inet6_dev *)table->extra1);
5119
5120 rtnl_unlock();
5121 return 0;
5122 }
5123
5124 static
5125 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5126 void __user *buffer, size_t *lenp, loff_t *ppos)
5127 {
5128 int *valp = ctl->data;
5129 int val = *valp;
5130 loff_t pos = *ppos;
5131 struct ctl_table lctl;
5132 int ret;
5133
5134 /*
5135 * ctl->data points to idev->cnf.disable_ipv6, we should
5136 * not modify it until we get the rtnl lock.
5137 */
5138 lctl = *ctl;
5139 lctl.data = &val;
5140
5141 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5142
5143 if (write)
5144 ret = addrconf_disable_ipv6(ctl, valp, val);
5145 if (ret)
5146 *ppos = pos;
5147 return ret;
5148 }
5149
5150 static
5151 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5152 void __user *buffer, size_t *lenp, loff_t *ppos)
5153 {
5154 int *valp = ctl->data;
5155 int ret;
5156 int old, new;
5157
5158 old = *valp;
5159 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5160 new = *valp;
5161
5162 if (write && old != new) {
5163 struct net *net = ctl->extra2;
5164
5165 if (!rtnl_trylock())
5166 return restart_syscall();
5167
5168 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5169 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5170 NETCONFA_IFINDEX_DEFAULT,
5171 net->ipv6.devconf_dflt);
5172 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5173 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5174 NETCONFA_IFINDEX_ALL,
5175 net->ipv6.devconf_all);
5176 else {
5177 struct inet6_dev *idev = ctl->extra1;
5178
5179 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5180 idev->dev->ifindex,
5181 &idev->cnf);
5182 }
5183 rtnl_unlock();
5184 }
5185
5186 return ret;
5187 }
5188
5189 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5190 void __user *buffer, size_t *lenp,
5191 loff_t *ppos)
5192 {
5193 int err;
5194 struct in6_addr addr;
5195 char str[IPV6_MAX_STRLEN];
5196 struct ctl_table lctl = *ctl;
5197 struct net *net = ctl->extra2;
5198 struct ipv6_stable_secret *secret = ctl->data;
5199
5200 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5201 return -EIO;
5202
5203 lctl.maxlen = IPV6_MAX_STRLEN;
5204 lctl.data = str;
5205
5206 if (!rtnl_trylock())
5207 return restart_syscall();
5208
5209 if (!write && !secret->initialized) {
5210 err = -EIO;
5211 goto out;
5212 }
5213
5214 if (!write) {
5215 err = snprintf(str, sizeof(str), "%pI6",
5216 &secret->secret);
5217 if (err >= sizeof(str)) {
5218 err = -EIO;
5219 goto out;
5220 }
5221 }
5222
5223 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5224 if (err || !write)
5225 goto out;
5226
5227 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5228 err = -EIO;
5229 goto out;
5230 }
5231
5232 secret->initialized = true;
5233 secret->secret = addr;
5234
5235 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5236 struct net_device *dev;
5237
5238 for_each_netdev(net, dev) {
5239 struct inet6_dev *idev = __in6_dev_get(dev);
5240
5241 if (idev) {
5242 idev->addr_gen_mode =
5243 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5244 }
5245 }
5246 } else {
5247 struct inet6_dev *idev = ctl->extra1;
5248
5249 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5250 }
5251
5252 out:
5253 rtnl_unlock();
5254
5255 return err;
5256 }
5257
5258 static struct addrconf_sysctl_table
5259 {
5260 struct ctl_table_header *sysctl_header;
5261 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5262 } addrconf_sysctl __read_mostly = {
5263 .sysctl_header = NULL,
5264 .addrconf_vars = {
5265 {
5266 .procname = "forwarding",
5267 .data = &ipv6_devconf.forwarding,
5268 .maxlen = sizeof(int),
5269 .mode = 0644,
5270 .proc_handler = addrconf_sysctl_forward,
5271 },
5272 {
5273 .procname = "hop_limit",
5274 .data = &ipv6_devconf.hop_limit,
5275 .maxlen = sizeof(int),
5276 .mode = 0644,
5277 .proc_handler = proc_dointvec,
5278 },
5279 {
5280 .procname = "mtu",
5281 .data = &ipv6_devconf.mtu6,
5282 .maxlen = sizeof(int),
5283 .mode = 0644,
5284 .proc_handler = addrconf_sysctl_mtu,
5285 },
5286 {
5287 .procname = "accept_ra",
5288 .data = &ipv6_devconf.accept_ra,
5289 .maxlen = sizeof(int),
5290 .mode = 0644,
5291 .proc_handler = proc_dointvec,
5292 },
5293 {
5294 .procname = "accept_redirects",
5295 .data = &ipv6_devconf.accept_redirects,
5296 .maxlen = sizeof(int),
5297 .mode = 0644,
5298 .proc_handler = proc_dointvec,
5299 },
5300 {
5301 .procname = "autoconf",
5302 .data = &ipv6_devconf.autoconf,
5303 .maxlen = sizeof(int),
5304 .mode = 0644,
5305 .proc_handler = proc_dointvec,
5306 },
5307 {
5308 .procname = "dad_transmits",
5309 .data = &ipv6_devconf.dad_transmits,
5310 .maxlen = sizeof(int),
5311 .mode = 0644,
5312 .proc_handler = proc_dointvec,
5313 },
5314 {
5315 .procname = "router_solicitations",
5316 .data = &ipv6_devconf.rtr_solicits,
5317 .maxlen = sizeof(int),
5318 .mode = 0644,
5319 .proc_handler = proc_dointvec,
5320 },
5321 {
5322 .procname = "router_solicitation_interval",
5323 .data = &ipv6_devconf.rtr_solicit_interval,
5324 .maxlen = sizeof(int),
5325 .mode = 0644,
5326 .proc_handler = proc_dointvec_jiffies,
5327 },
5328 {
5329 .procname = "router_solicitation_delay",
5330 .data = &ipv6_devconf.rtr_solicit_delay,
5331 .maxlen = sizeof(int),
5332 .mode = 0644,
5333 .proc_handler = proc_dointvec_jiffies,
5334 },
5335 {
5336 .procname = "force_mld_version",
5337 .data = &ipv6_devconf.force_mld_version,
5338 .maxlen = sizeof(int),
5339 .mode = 0644,
5340 .proc_handler = proc_dointvec,
5341 },
5342 {
5343 .procname = "mldv1_unsolicited_report_interval",
5344 .data =
5345 &ipv6_devconf.mldv1_unsolicited_report_interval,
5346 .maxlen = sizeof(int),
5347 .mode = 0644,
5348 .proc_handler = proc_dointvec_ms_jiffies,
5349 },
5350 {
5351 .procname = "mldv2_unsolicited_report_interval",
5352 .data =
5353 &ipv6_devconf.mldv2_unsolicited_report_interval,
5354 .maxlen = sizeof(int),
5355 .mode = 0644,
5356 .proc_handler = proc_dointvec_ms_jiffies,
5357 },
5358 {
5359 .procname = "use_tempaddr",
5360 .data = &ipv6_devconf.use_tempaddr,
5361 .maxlen = sizeof(int),
5362 .mode = 0644,
5363 .proc_handler = proc_dointvec,
5364 },
5365 {
5366 .procname = "temp_valid_lft",
5367 .data = &ipv6_devconf.temp_valid_lft,
5368 .maxlen = sizeof(int),
5369 .mode = 0644,
5370 .proc_handler = proc_dointvec,
5371 },
5372 {
5373 .procname = "temp_prefered_lft",
5374 .data = &ipv6_devconf.temp_prefered_lft,
5375 .maxlen = sizeof(int),
5376 .mode = 0644,
5377 .proc_handler = proc_dointvec,
5378 },
5379 {
5380 .procname = "regen_max_retry",
5381 .data = &ipv6_devconf.regen_max_retry,
5382 .maxlen = sizeof(int),
5383 .mode = 0644,
5384 .proc_handler = proc_dointvec,
5385 },
5386 {
5387 .procname = "max_desync_factor",
5388 .data = &ipv6_devconf.max_desync_factor,
5389 .maxlen = sizeof(int),
5390 .mode = 0644,
5391 .proc_handler = proc_dointvec,
5392 },
5393 {
5394 .procname = "max_addresses",
5395 .data = &ipv6_devconf.max_addresses,
5396 .maxlen = sizeof(int),
5397 .mode = 0644,
5398 .proc_handler = proc_dointvec,
5399 },
5400 {
5401 .procname = "accept_ra_defrtr",
5402 .data = &ipv6_devconf.accept_ra_defrtr,
5403 .maxlen = sizeof(int),
5404 .mode = 0644,
5405 .proc_handler = proc_dointvec,
5406 },
5407 {
5408 .procname = "accept_ra_pinfo",
5409 .data = &ipv6_devconf.accept_ra_pinfo,
5410 .maxlen = sizeof(int),
5411 .mode = 0644,
5412 .proc_handler = proc_dointvec,
5413 },
5414 #ifdef CONFIG_IPV6_ROUTER_PREF
5415 {
5416 .procname = "accept_ra_rtr_pref",
5417 .data = &ipv6_devconf.accept_ra_rtr_pref,
5418 .maxlen = sizeof(int),
5419 .mode = 0644,
5420 .proc_handler = proc_dointvec,
5421 },
5422 {
5423 .procname = "router_probe_interval",
5424 .data = &ipv6_devconf.rtr_probe_interval,
5425 .maxlen = sizeof(int),
5426 .mode = 0644,
5427 .proc_handler = proc_dointvec_jiffies,
5428 },
5429 #ifdef CONFIG_IPV6_ROUTE_INFO
5430 {
5431 .procname = "accept_ra_rt_info_max_plen",
5432 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5433 .maxlen = sizeof(int),
5434 .mode = 0644,
5435 .proc_handler = proc_dointvec,
5436 },
5437 #endif
5438 #endif
5439 {
5440 .procname = "proxy_ndp",
5441 .data = &ipv6_devconf.proxy_ndp,
5442 .maxlen = sizeof(int),
5443 .mode = 0644,
5444 .proc_handler = addrconf_sysctl_proxy_ndp,
5445 },
5446 {
5447 .procname = "accept_source_route",
5448 .data = &ipv6_devconf.accept_source_route,
5449 .maxlen = sizeof(int),
5450 .mode = 0644,
5451 .proc_handler = proc_dointvec,
5452 },
5453 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5454 {
5455 .procname = "optimistic_dad",
5456 .data = &ipv6_devconf.optimistic_dad,
5457 .maxlen = sizeof(int),
5458 .mode = 0644,
5459 .proc_handler = proc_dointvec,
5460
5461 },
5462 {
5463 .procname = "use_optimistic",
5464 .data = &ipv6_devconf.use_optimistic,
5465 .maxlen = sizeof(int),
5466 .mode = 0644,
5467 .proc_handler = proc_dointvec,
5468
5469 },
5470 #endif
5471 #ifdef CONFIG_IPV6_MROUTE
5472 {
5473 .procname = "mc_forwarding",
5474 .data = &ipv6_devconf.mc_forwarding,
5475 .maxlen = sizeof(int),
5476 .mode = 0444,
5477 .proc_handler = proc_dointvec,
5478 },
5479 #endif
5480 {
5481 .procname = "disable_ipv6",
5482 .data = &ipv6_devconf.disable_ipv6,
5483 .maxlen = sizeof(int),
5484 .mode = 0644,
5485 .proc_handler = addrconf_sysctl_disable,
5486 },
5487 {
5488 .procname = "accept_dad",
5489 .data = &ipv6_devconf.accept_dad,
5490 .maxlen = sizeof(int),
5491 .mode = 0644,
5492 .proc_handler = proc_dointvec,
5493 },
5494 {
5495 .procname = "force_tllao",
5496 .data = &ipv6_devconf.force_tllao,
5497 .maxlen = sizeof(int),
5498 .mode = 0644,
5499 .proc_handler = proc_dointvec
5500 },
5501 {
5502 .procname = "ndisc_notify",
5503 .data = &ipv6_devconf.ndisc_notify,
5504 .maxlen = sizeof(int),
5505 .mode = 0644,
5506 .proc_handler = proc_dointvec
5507 },
5508 {
5509 .procname = "suppress_frag_ndisc",
5510 .data = &ipv6_devconf.suppress_frag_ndisc,
5511 .maxlen = sizeof(int),
5512 .mode = 0644,
5513 .proc_handler = proc_dointvec
5514 },
5515 {
5516 .procname = "accept_ra_from_local",
5517 .data = &ipv6_devconf.accept_ra_from_local,
5518 .maxlen = sizeof(int),
5519 .mode = 0644,
5520 .proc_handler = proc_dointvec,
5521 },
5522 {
5523 .procname = "accept_ra_mtu",
5524 .data = &ipv6_devconf.accept_ra_mtu,
5525 .maxlen = sizeof(int),
5526 .mode = 0644,
5527 .proc_handler = proc_dointvec,
5528 },
5529 {
5530 .procname = "stable_secret",
5531 .data = &ipv6_devconf.stable_secret,
5532 .maxlen = IPV6_MAX_STRLEN,
5533 .mode = 0600,
5534 .proc_handler = addrconf_sysctl_stable_secret,
5535 },
5536 {
5537 /* sentinel */
5538 }
5539 },
5540 };
5541
5542 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5543 struct inet6_dev *idev, struct ipv6_devconf *p)
5544 {
5545 int i;
5546 struct addrconf_sysctl_table *t;
5547 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5548
5549 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5550 if (t == NULL)
5551 goto out;
5552
5553 for (i = 0; t->addrconf_vars[i].data; i++) {
5554 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5555 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5556 t->addrconf_vars[i].extra2 = net;
5557 }
5558
5559 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5560
5561 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5562 if (t->sysctl_header == NULL)
5563 goto free;
5564
5565 p->sysctl = t;
5566 return 0;
5567
5568 free:
5569 kfree(t);
5570 out:
5571 return -ENOBUFS;
5572 }
5573
5574 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5575 {
5576 struct addrconf_sysctl_table *t;
5577
5578 if (p->sysctl == NULL)
5579 return;
5580
5581 t = p->sysctl;
5582 p->sysctl = NULL;
5583 unregister_net_sysctl_table(t->sysctl_header);
5584 kfree(t);
5585 }
5586
5587 static int addrconf_sysctl_register(struct inet6_dev *idev)
5588 {
5589 int err;
5590
5591 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5592 return -EINVAL;
5593
5594 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5595 &ndisc_ifinfo_sysctl_change);
5596 if (err)
5597 return err;
5598 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5599 idev, &idev->cnf);
5600 if (err)
5601 neigh_sysctl_unregister(idev->nd_parms);
5602
5603 return err;
5604 }
5605
5606 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5607 {
5608 __addrconf_sysctl_unregister(&idev->cnf);
5609 neigh_sysctl_unregister(idev->nd_parms);
5610 }
5611
5612
5613 #endif
5614
5615 static int __net_init addrconf_init_net(struct net *net)
5616 {
5617 int err = -ENOMEM;
5618 struct ipv6_devconf *all, *dflt;
5619
5620 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5621 if (all == NULL)
5622 goto err_alloc_all;
5623
5624 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5625 if (dflt == NULL)
5626 goto err_alloc_dflt;
5627
5628 /* these will be inherited by all namespaces */
5629 dflt->autoconf = ipv6_defaults.autoconf;
5630 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5631
5632 dflt->stable_secret.initialized = false;
5633 all->stable_secret.initialized = false;
5634
5635 net->ipv6.devconf_all = all;
5636 net->ipv6.devconf_dflt = dflt;
5637
5638 #ifdef CONFIG_SYSCTL
5639 err = __addrconf_sysctl_register(net, "all", NULL, all);
5640 if (err < 0)
5641 goto err_reg_all;
5642
5643 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5644 if (err < 0)
5645 goto err_reg_dflt;
5646 #endif
5647 return 0;
5648
5649 #ifdef CONFIG_SYSCTL
5650 err_reg_dflt:
5651 __addrconf_sysctl_unregister(all);
5652 err_reg_all:
5653 kfree(dflt);
5654 #endif
5655 err_alloc_dflt:
5656 kfree(all);
5657 err_alloc_all:
5658 return err;
5659 }
5660
5661 static void __net_exit addrconf_exit_net(struct net *net)
5662 {
5663 #ifdef CONFIG_SYSCTL
5664 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5665 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5666 #endif
5667 kfree(net->ipv6.devconf_dflt);
5668 kfree(net->ipv6.devconf_all);
5669 }
5670
5671 static struct pernet_operations addrconf_ops = {
5672 .init = addrconf_init_net,
5673 .exit = addrconf_exit_net,
5674 };
5675
5676 static struct rtnl_af_ops inet6_ops __read_mostly = {
5677 .family = AF_INET6,
5678 .fill_link_af = inet6_fill_link_af,
5679 .get_link_af_size = inet6_get_link_af_size,
5680 .validate_link_af = inet6_validate_link_af,
5681 .set_link_af = inet6_set_link_af,
5682 };
5683
5684 /*
5685 * Init / cleanup code
5686 */
5687
5688 int __init addrconf_init(void)
5689 {
5690 struct inet6_dev *idev;
5691 int i, err;
5692
5693 err = ipv6_addr_label_init();
5694 if (err < 0) {
5695 pr_crit("%s: cannot initialize default policy table: %d\n",
5696 __func__, err);
5697 goto out;
5698 }
5699
5700 err = register_pernet_subsys(&addrconf_ops);
5701 if (err < 0)
5702 goto out_addrlabel;
5703
5704 addrconf_wq = create_workqueue("ipv6_addrconf");
5705 if (!addrconf_wq) {
5706 err = -ENOMEM;
5707 goto out_nowq;
5708 }
5709
5710 /* The addrconf netdev notifier requires that loopback_dev
5711 * has it's ipv6 private information allocated and setup
5712 * before it can bring up and give link-local addresses
5713 * to other devices which are up.
5714 *
5715 * Unfortunately, loopback_dev is not necessarily the first
5716 * entry in the global dev_base list of net devices. In fact,
5717 * it is likely to be the very last entry on that list.
5718 * So this causes the notifier registry below to try and
5719 * give link-local addresses to all devices besides loopback_dev
5720 * first, then loopback_dev, which cases all the non-loopback_dev
5721 * devices to fail to get a link-local address.
5722 *
5723 * So, as a temporary fix, allocate the ipv6 structure for
5724 * loopback_dev first by hand.
5725 * Longer term, all of the dependencies ipv6 has upon the loopback
5726 * device and it being up should be removed.
5727 */
5728 rtnl_lock();
5729 idev = ipv6_add_dev(init_net.loopback_dev);
5730 rtnl_unlock();
5731 if (IS_ERR(idev)) {
5732 err = PTR_ERR(idev);
5733 goto errlo;
5734 }
5735
5736 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5737 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5738
5739 register_netdevice_notifier(&ipv6_dev_notf);
5740
5741 addrconf_verify();
5742
5743 rtnl_af_register(&inet6_ops);
5744
5745 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5746 NULL);
5747 if (err < 0)
5748 goto errout;
5749
5750 /* Only the first call to __rtnl_register can fail */
5751 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5752 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5753 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5754 inet6_dump_ifaddr, NULL);
5755 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5756 inet6_dump_ifmcaddr, NULL);
5757 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5758 inet6_dump_ifacaddr, NULL);
5759 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5760 inet6_netconf_dump_devconf, NULL);
5761
5762 ipv6_addr_label_rtnl_register();
5763
5764 return 0;
5765 errout:
5766 rtnl_af_unregister(&inet6_ops);
5767 unregister_netdevice_notifier(&ipv6_dev_notf);
5768 errlo:
5769 destroy_workqueue(addrconf_wq);
5770 out_nowq:
5771 unregister_pernet_subsys(&addrconf_ops);
5772 out_addrlabel:
5773 ipv6_addr_label_cleanup();
5774 out:
5775 return err;
5776 }
5777
5778 void addrconf_cleanup(void)
5779 {
5780 struct net_device *dev;
5781 int i;
5782
5783 unregister_netdevice_notifier(&ipv6_dev_notf);
5784 unregister_pernet_subsys(&addrconf_ops);
5785 ipv6_addr_label_cleanup();
5786
5787 rtnl_lock();
5788
5789 __rtnl_af_unregister(&inet6_ops);
5790
5791 /* clean dev list */
5792 for_each_netdev(&init_net, dev) {
5793 if (__in6_dev_get(dev) == NULL)
5794 continue;
5795 addrconf_ifdown(dev, 1);
5796 }
5797 addrconf_ifdown(init_net.loopback_dev, 2);
5798
5799 /*
5800 * Check hash table.
5801 */
5802 spin_lock_bh(&addrconf_hash_lock);
5803 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5804 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5805 spin_unlock_bh(&addrconf_hash_lock);
5806 cancel_delayed_work(&addr_chk_work);
5807 rtnl_unlock();
5808
5809 destroy_workqueue(addrconf_wq);
5810 }
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