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Merge ath-next from ath.git.
[mirror_ubuntu-jammy-kernel.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/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)
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) {
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)
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)
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)
578 goto errout;
579 in6_dev = __in6_dev_get(dev);
580 if (!in6_dev)
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)
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) {
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 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
877 INIT_HLIST_NODE(&ifa->addr_lst);
878 ifa->scope = scope;
879 ifa->prefix_len = pfxlen;
880 ifa->flags = flags | IFA_F_TENTATIVE;
881 ifa->valid_lft = valid_lft;
882 ifa->prefered_lft = prefered_lft;
883 ifa->cstamp = ifa->tstamp = jiffies;
884 ifa->tokenized = false;
885
886 ifa->rt = rt;
887
888 ifa->idev = idev;
889 in6_dev_hold(idev);
890 /* For caller */
891 in6_ifa_hold(ifa);
892
893 /* Add to big hash table */
894 hash = inet6_addr_hash(addr);
895
896 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
897 spin_unlock(&addrconf_hash_lock);
898
899 write_lock(&idev->lock);
900 /* Add to inet6_dev unicast addr list. */
901 ipv6_link_dev_addr(idev, ifa);
902
903 if (ifa->flags&IFA_F_TEMPORARY) {
904 list_add(&ifa->tmp_list, &idev->tempaddr_list);
905 in6_ifa_hold(ifa);
906 }
907
908 in6_ifa_hold(ifa);
909 write_unlock(&idev->lock);
910 out2:
911 rcu_read_unlock_bh();
912
913 if (likely(err == 0))
914 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
915 else {
916 kfree(ifa);
917 ifa = ERR_PTR(err);
918 }
919
920 return ifa;
921 out:
922 spin_unlock(&addrconf_hash_lock);
923 goto out2;
924 }
925
926 enum cleanup_prefix_rt_t {
927 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
928 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
929 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
930 };
931
932 /*
933 * Check, whether the prefix for ifp would still need a prefix route
934 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
935 * constants.
936 *
937 * 1) we don't purge prefix if address was not permanent.
938 * prefix is managed by its own lifetime.
939 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
940 * 3) if there are no addresses, delete prefix.
941 * 4) if there are still other permanent address(es),
942 * corresponding prefix is still permanent.
943 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
944 * don't purge the prefix, assume user space is managing it.
945 * 6) otherwise, update prefix lifetime to the
946 * longest valid lifetime among the corresponding
947 * addresses on the device.
948 * Note: subsequent RA will update lifetime.
949 **/
950 static enum cleanup_prefix_rt_t
951 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
952 {
953 struct inet6_ifaddr *ifa;
954 struct inet6_dev *idev = ifp->idev;
955 unsigned long lifetime;
956 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
957
958 *expires = jiffies;
959
960 list_for_each_entry(ifa, &idev->addr_list, if_list) {
961 if (ifa == ifp)
962 continue;
963 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
964 ifp->prefix_len))
965 continue;
966 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
967 return CLEANUP_PREFIX_RT_NOP;
968
969 action = CLEANUP_PREFIX_RT_EXPIRE;
970
971 spin_lock(&ifa->lock);
972
973 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
974 /*
975 * Note: Because this address is
976 * not permanent, lifetime <
977 * LONG_MAX / HZ here.
978 */
979 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
980 *expires = ifa->tstamp + lifetime * HZ;
981 spin_unlock(&ifa->lock);
982 }
983
984 return action;
985 }
986
987 static void
988 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
989 {
990 struct rt6_info *rt;
991
992 rt = addrconf_get_prefix_route(&ifp->addr,
993 ifp->prefix_len,
994 ifp->idev->dev,
995 0, RTF_GATEWAY | RTF_DEFAULT);
996 if (rt) {
997 if (del_rt)
998 ip6_del_rt(rt);
999 else {
1000 if (!(rt->rt6i_flags & RTF_EXPIRES))
1001 rt6_set_expires(rt, expires);
1002 ip6_rt_put(rt);
1003 }
1004 }
1005 }
1006
1007
1008 /* This function wants to get referenced ifp and releases it before return */
1009
1010 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1011 {
1012 int state;
1013 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1014 unsigned long expires;
1015
1016 ASSERT_RTNL();
1017
1018 spin_lock_bh(&ifp->lock);
1019 state = ifp->state;
1020 ifp->state = INET6_IFADDR_STATE_DEAD;
1021 spin_unlock_bh(&ifp->lock);
1022
1023 if (state == INET6_IFADDR_STATE_DEAD)
1024 goto out;
1025
1026 spin_lock_bh(&addrconf_hash_lock);
1027 hlist_del_init_rcu(&ifp->addr_lst);
1028 spin_unlock_bh(&addrconf_hash_lock);
1029
1030 write_lock_bh(&ifp->idev->lock);
1031
1032 if (ifp->flags&IFA_F_TEMPORARY) {
1033 list_del(&ifp->tmp_list);
1034 if (ifp->ifpub) {
1035 in6_ifa_put(ifp->ifpub);
1036 ifp->ifpub = NULL;
1037 }
1038 __in6_ifa_put(ifp);
1039 }
1040
1041 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1042 action = check_cleanup_prefix_route(ifp, &expires);
1043
1044 list_del_init(&ifp->if_list);
1045 __in6_ifa_put(ifp);
1046
1047 write_unlock_bh(&ifp->idev->lock);
1048
1049 addrconf_del_dad_work(ifp);
1050
1051 ipv6_ifa_notify(RTM_DELADDR, ifp);
1052
1053 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1054
1055 if (action != CLEANUP_PREFIX_RT_NOP) {
1056 cleanup_prefix_route(ifp, expires,
1057 action == CLEANUP_PREFIX_RT_DEL);
1058 }
1059
1060 /* clean up prefsrc entries */
1061 rt6_remove_prefsrc(ifp);
1062 out:
1063 in6_ifa_put(ifp);
1064 }
1065
1066 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1067 {
1068 struct inet6_dev *idev = ifp->idev;
1069 struct in6_addr addr, *tmpaddr;
1070 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1071 unsigned long regen_advance;
1072 int tmp_plen;
1073 int ret = 0;
1074 u32 addr_flags;
1075 unsigned long now = jiffies;
1076
1077 write_lock_bh(&idev->lock);
1078 if (ift) {
1079 spin_lock_bh(&ift->lock);
1080 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1081 spin_unlock_bh(&ift->lock);
1082 tmpaddr = &addr;
1083 } else {
1084 tmpaddr = NULL;
1085 }
1086 retry:
1087 in6_dev_hold(idev);
1088 if (idev->cnf.use_tempaddr <= 0) {
1089 write_unlock_bh(&idev->lock);
1090 pr_info("%s: use_tempaddr is disabled\n", __func__);
1091 in6_dev_put(idev);
1092 ret = -1;
1093 goto out;
1094 }
1095 spin_lock_bh(&ifp->lock);
1096 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1097 idev->cnf.use_tempaddr = -1; /*XXX*/
1098 spin_unlock_bh(&ifp->lock);
1099 write_unlock_bh(&idev->lock);
1100 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1101 __func__);
1102 in6_dev_put(idev);
1103 ret = -1;
1104 goto out;
1105 }
1106 in6_ifa_hold(ifp);
1107 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1108 __ipv6_try_regen_rndid(idev, tmpaddr);
1109 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1110 age = (now - ifp->tstamp) / HZ;
1111 tmp_valid_lft = min_t(__u32,
1112 ifp->valid_lft,
1113 idev->cnf.temp_valid_lft + age);
1114 tmp_prefered_lft = min_t(__u32,
1115 ifp->prefered_lft,
1116 idev->cnf.temp_prefered_lft + age -
1117 idev->cnf.max_desync_factor);
1118 tmp_plen = ifp->prefix_len;
1119 tmp_tstamp = ifp->tstamp;
1120 spin_unlock_bh(&ifp->lock);
1121
1122 regen_advance = idev->cnf.regen_max_retry *
1123 idev->cnf.dad_transmits *
1124 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1125 write_unlock_bh(&idev->lock);
1126
1127 /* A temporary address is created only if this calculated Preferred
1128 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1129 * an implementation must not create a temporary address with a zero
1130 * Preferred Lifetime.
1131 * Use age calculation as in addrconf_verify to avoid unnecessary
1132 * temporary addresses being generated.
1133 */
1134 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1135 if (tmp_prefered_lft <= regen_advance + age) {
1136 in6_ifa_put(ifp);
1137 in6_dev_put(idev);
1138 ret = -1;
1139 goto out;
1140 }
1141
1142 addr_flags = IFA_F_TEMPORARY;
1143 /* set in addrconf_prefix_rcv() */
1144 if (ifp->flags & IFA_F_OPTIMISTIC)
1145 addr_flags |= IFA_F_OPTIMISTIC;
1146
1147 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1148 ipv6_addr_scope(&addr), addr_flags,
1149 tmp_valid_lft, tmp_prefered_lft);
1150 if (IS_ERR(ift)) {
1151 in6_ifa_put(ifp);
1152 in6_dev_put(idev);
1153 pr_info("%s: retry temporary address regeneration\n", __func__);
1154 tmpaddr = &addr;
1155 write_lock_bh(&idev->lock);
1156 goto retry;
1157 }
1158
1159 spin_lock_bh(&ift->lock);
1160 ift->ifpub = ifp;
1161 ift->cstamp = now;
1162 ift->tstamp = tmp_tstamp;
1163 spin_unlock_bh(&ift->lock);
1164
1165 addrconf_dad_start(ift);
1166 in6_ifa_put(ift);
1167 in6_dev_put(idev);
1168 out:
1169 return ret;
1170 }
1171
1172 /*
1173 * Choose an appropriate source address (RFC3484)
1174 */
1175 enum {
1176 IPV6_SADDR_RULE_INIT = 0,
1177 IPV6_SADDR_RULE_LOCAL,
1178 IPV6_SADDR_RULE_SCOPE,
1179 IPV6_SADDR_RULE_PREFERRED,
1180 #ifdef CONFIG_IPV6_MIP6
1181 IPV6_SADDR_RULE_HOA,
1182 #endif
1183 IPV6_SADDR_RULE_OIF,
1184 IPV6_SADDR_RULE_LABEL,
1185 IPV6_SADDR_RULE_PRIVACY,
1186 IPV6_SADDR_RULE_ORCHID,
1187 IPV6_SADDR_RULE_PREFIX,
1188 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1189 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1190 #endif
1191 IPV6_SADDR_RULE_MAX
1192 };
1193
1194 struct ipv6_saddr_score {
1195 int rule;
1196 int addr_type;
1197 struct inet6_ifaddr *ifa;
1198 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1199 int scopedist;
1200 int matchlen;
1201 };
1202
1203 struct ipv6_saddr_dst {
1204 const struct in6_addr *addr;
1205 int ifindex;
1206 int scope;
1207 int label;
1208 unsigned int prefs;
1209 };
1210
1211 static inline int ipv6_saddr_preferred(int type)
1212 {
1213 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1214 return 1;
1215 return 0;
1216 }
1217
1218 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1219 {
1220 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1221 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1222 #else
1223 return false;
1224 #endif
1225 }
1226
1227 static int ipv6_get_saddr_eval(struct net *net,
1228 struct ipv6_saddr_score *score,
1229 struct ipv6_saddr_dst *dst,
1230 int i)
1231 {
1232 int ret;
1233
1234 if (i <= score->rule) {
1235 switch (i) {
1236 case IPV6_SADDR_RULE_SCOPE:
1237 ret = score->scopedist;
1238 break;
1239 case IPV6_SADDR_RULE_PREFIX:
1240 ret = score->matchlen;
1241 break;
1242 default:
1243 ret = !!test_bit(i, score->scorebits);
1244 }
1245 goto out;
1246 }
1247
1248 switch (i) {
1249 case IPV6_SADDR_RULE_INIT:
1250 /* Rule 0: remember if hiscore is not ready yet */
1251 ret = !!score->ifa;
1252 break;
1253 case IPV6_SADDR_RULE_LOCAL:
1254 /* Rule 1: Prefer same address */
1255 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1256 break;
1257 case IPV6_SADDR_RULE_SCOPE:
1258 /* Rule 2: Prefer appropriate scope
1259 *
1260 * ret
1261 * ^
1262 * -1 | d 15
1263 * ---+--+-+---> scope
1264 * |
1265 * | d is scope of the destination.
1266 * B-d | \
1267 * | \ <- smaller scope is better if
1268 * B-15 | \ if scope is enough for destination.
1269 * | ret = B - scope (-1 <= scope >= d <= 15).
1270 * d-C-1 | /
1271 * |/ <- greater is better
1272 * -C / if scope is not enough for destination.
1273 * /| ret = scope - C (-1 <= d < scope <= 15).
1274 *
1275 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1276 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1277 * Assume B = 0 and we get C > 29.
1278 */
1279 ret = __ipv6_addr_src_scope(score->addr_type);
1280 if (ret >= dst->scope)
1281 ret = -ret;
1282 else
1283 ret -= 128; /* 30 is enough */
1284 score->scopedist = ret;
1285 break;
1286 case IPV6_SADDR_RULE_PREFERRED:
1287 {
1288 /* Rule 3: Avoid deprecated and optimistic addresses */
1289 u8 avoid = IFA_F_DEPRECATED;
1290
1291 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1292 avoid |= IFA_F_OPTIMISTIC;
1293 ret = ipv6_saddr_preferred(score->addr_type) ||
1294 !(score->ifa->flags & avoid);
1295 break;
1296 }
1297 #ifdef CONFIG_IPV6_MIP6
1298 case IPV6_SADDR_RULE_HOA:
1299 {
1300 /* Rule 4: Prefer home address */
1301 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1302 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1303 break;
1304 }
1305 #endif
1306 case IPV6_SADDR_RULE_OIF:
1307 /* Rule 5: Prefer outgoing interface */
1308 ret = (!dst->ifindex ||
1309 dst->ifindex == score->ifa->idev->dev->ifindex);
1310 break;
1311 case IPV6_SADDR_RULE_LABEL:
1312 /* Rule 6: Prefer matching label */
1313 ret = ipv6_addr_label(net,
1314 &score->ifa->addr, score->addr_type,
1315 score->ifa->idev->dev->ifindex) == dst->label;
1316 break;
1317 case IPV6_SADDR_RULE_PRIVACY:
1318 {
1319 /* Rule 7: Prefer public address
1320 * Note: prefer temporary address if use_tempaddr >= 2
1321 */
1322 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1323 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1324 score->ifa->idev->cnf.use_tempaddr >= 2;
1325 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1326 break;
1327 }
1328 case IPV6_SADDR_RULE_ORCHID:
1329 /* Rule 8-: Prefer ORCHID vs ORCHID or
1330 * non-ORCHID vs non-ORCHID
1331 */
1332 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1333 ipv6_addr_orchid(dst->addr));
1334 break;
1335 case IPV6_SADDR_RULE_PREFIX:
1336 /* Rule 8: Use longest matching prefix */
1337 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1338 if (ret > score->ifa->prefix_len)
1339 ret = score->ifa->prefix_len;
1340 score->matchlen = ret;
1341 break;
1342 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1343 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1344 /* Optimistic addresses still have lower precedence than other
1345 * preferred addresses.
1346 */
1347 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1348 break;
1349 #endif
1350 default:
1351 ret = 0;
1352 }
1353
1354 if (ret)
1355 __set_bit(i, score->scorebits);
1356 score->rule = i;
1357 out:
1358 return ret;
1359 }
1360
1361 static void __ipv6_dev_get_saddr(struct net *net,
1362 struct ipv6_saddr_dst *dst,
1363 unsigned int prefs,
1364 const struct in6_addr *saddr,
1365 struct inet6_dev *idev,
1366 struct ipv6_saddr_score *scores)
1367 {
1368 struct ipv6_saddr_score *score = &scores[0], *hiscore = &scores[1];
1369
1370 read_lock_bh(&idev->lock);
1371 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1372 int i;
1373
1374 /*
1375 * - Tentative Address (RFC2462 section 5.4)
1376 * - A tentative address is not considered
1377 * "assigned to an interface" in the traditional
1378 * sense, unless it is also flagged as optimistic.
1379 * - Candidate Source Address (section 4)
1380 * - In any case, anycast addresses, multicast
1381 * addresses, and the unspecified address MUST
1382 * NOT be included in a candidate set.
1383 */
1384 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1385 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1386 continue;
1387
1388 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1389
1390 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1391 score->addr_type & IPV6_ADDR_MULTICAST)) {
1392 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1393 idev->dev->name);
1394 continue;
1395 }
1396
1397 score->rule = -1;
1398 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1399
1400 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1401 int minihiscore, miniscore;
1402
1403 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1404 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1405
1406 if (minihiscore > miniscore) {
1407 if (i == IPV6_SADDR_RULE_SCOPE &&
1408 score->scopedist > 0) {
1409 /*
1410 * special case:
1411 * each remaining entry
1412 * has too small (not enough)
1413 * scope, because ifa entries
1414 * are sorted by their scope
1415 * values.
1416 */
1417 goto out;
1418 }
1419 break;
1420 } else if (minihiscore < miniscore) {
1421 if (hiscore->ifa)
1422 in6_ifa_put(hiscore->ifa);
1423
1424 in6_ifa_hold(score->ifa);
1425
1426 swap(hiscore, score);
1427
1428 /* restore our iterator */
1429 score->ifa = hiscore->ifa;
1430
1431 break;
1432 }
1433 }
1434 }
1435 out:
1436 read_unlock_bh(&idev->lock);
1437 }
1438
1439 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1440 const struct in6_addr *daddr, unsigned int prefs,
1441 struct in6_addr *saddr)
1442 {
1443 struct ipv6_saddr_score scores[2], *hiscore = &scores[1];
1444 struct ipv6_saddr_dst dst;
1445 struct inet6_dev *idev;
1446 struct net_device *dev;
1447 int dst_type;
1448 bool use_oif_addr = false;
1449
1450 dst_type = __ipv6_addr_type(daddr);
1451 dst.addr = daddr;
1452 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1453 dst.scope = __ipv6_addr_src_scope(dst_type);
1454 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1455 dst.prefs = prefs;
1456
1457 hiscore->rule = -1;
1458 hiscore->ifa = NULL;
1459
1460 rcu_read_lock();
1461
1462 /* Candidate Source Address (section 4)
1463 * - multicast and link-local destination address,
1464 * the set of candidate source address MUST only
1465 * include addresses assigned to interfaces
1466 * belonging to the same link as the outgoing
1467 * interface.
1468 * (- For site-local destination addresses, the
1469 * set of candidate source addresses MUST only
1470 * include addresses assigned to interfaces
1471 * belonging to the same site as the outgoing
1472 * interface.)
1473 */
1474 if (dst_dev) {
1475 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1476 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) {
1477 idev = __in6_dev_get(dst_dev);
1478 use_oif_addr = true;
1479 }
1480 }
1481
1482 if (use_oif_addr) {
1483 __ipv6_dev_get_saddr(net, &dst, prefs, saddr, idev, scores);
1484 } else {
1485 for_each_netdev_rcu(net, dev) {
1486 idev = __in6_dev_get(dev);
1487 if (!idev)
1488 continue;
1489 __ipv6_dev_get_saddr(net, &dst, prefs, saddr, idev, scores);
1490 }
1491 }
1492 rcu_read_unlock();
1493
1494 if (!hiscore->ifa)
1495 return -EADDRNOTAVAIL;
1496
1497 *saddr = hiscore->ifa->addr;
1498 in6_ifa_put(hiscore->ifa);
1499 return 0;
1500 }
1501 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1502
1503 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1504 u32 banned_flags)
1505 {
1506 struct inet6_ifaddr *ifp;
1507 int err = -EADDRNOTAVAIL;
1508
1509 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1510 if (ifp->scope > IFA_LINK)
1511 break;
1512 if (ifp->scope == IFA_LINK &&
1513 !(ifp->flags & banned_flags)) {
1514 *addr = ifp->addr;
1515 err = 0;
1516 break;
1517 }
1518 }
1519 return err;
1520 }
1521
1522 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1523 u32 banned_flags)
1524 {
1525 struct inet6_dev *idev;
1526 int err = -EADDRNOTAVAIL;
1527
1528 rcu_read_lock();
1529 idev = __in6_dev_get(dev);
1530 if (idev) {
1531 read_lock_bh(&idev->lock);
1532 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1533 read_unlock_bh(&idev->lock);
1534 }
1535 rcu_read_unlock();
1536 return err;
1537 }
1538
1539 static int ipv6_count_addresses(struct inet6_dev *idev)
1540 {
1541 int cnt = 0;
1542 struct inet6_ifaddr *ifp;
1543
1544 read_lock_bh(&idev->lock);
1545 list_for_each_entry(ifp, &idev->addr_list, if_list)
1546 cnt++;
1547 read_unlock_bh(&idev->lock);
1548 return cnt;
1549 }
1550
1551 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1552 const struct net_device *dev, int strict)
1553 {
1554 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1555 }
1556 EXPORT_SYMBOL(ipv6_chk_addr);
1557
1558 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1559 const struct net_device *dev, int strict,
1560 u32 banned_flags)
1561 {
1562 struct inet6_ifaddr *ifp;
1563 unsigned int hash = inet6_addr_hash(addr);
1564 u32 ifp_flags;
1565
1566 rcu_read_lock_bh();
1567 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1568 if (!net_eq(dev_net(ifp->idev->dev), net))
1569 continue;
1570 /* Decouple optimistic from tentative for evaluation here.
1571 * Ban optimistic addresses explicitly, when required.
1572 */
1573 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1574 ? (ifp->flags&~IFA_F_TENTATIVE)
1575 : ifp->flags;
1576 if (ipv6_addr_equal(&ifp->addr, addr) &&
1577 !(ifp_flags&banned_flags) &&
1578 (!dev || ifp->idev->dev == dev ||
1579 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1580 rcu_read_unlock_bh();
1581 return 1;
1582 }
1583 }
1584
1585 rcu_read_unlock_bh();
1586 return 0;
1587 }
1588 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1589
1590 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1591 struct net_device *dev)
1592 {
1593 unsigned int hash = inet6_addr_hash(addr);
1594 struct inet6_ifaddr *ifp;
1595
1596 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1597 if (!net_eq(dev_net(ifp->idev->dev), net))
1598 continue;
1599 if (ipv6_addr_equal(&ifp->addr, addr)) {
1600 if (!dev || ifp->idev->dev == dev)
1601 return true;
1602 }
1603 }
1604 return false;
1605 }
1606
1607 /* Compares an address/prefix_len with addresses on device @dev.
1608 * If one is found it returns true.
1609 */
1610 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1611 const unsigned int prefix_len, struct net_device *dev)
1612 {
1613 struct inet6_dev *idev;
1614 struct inet6_ifaddr *ifa;
1615 bool ret = false;
1616
1617 rcu_read_lock();
1618 idev = __in6_dev_get(dev);
1619 if (idev) {
1620 read_lock_bh(&idev->lock);
1621 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1622 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1623 if (ret)
1624 break;
1625 }
1626 read_unlock_bh(&idev->lock);
1627 }
1628 rcu_read_unlock();
1629
1630 return ret;
1631 }
1632 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1633
1634 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1635 {
1636 struct inet6_dev *idev;
1637 struct inet6_ifaddr *ifa;
1638 int onlink;
1639
1640 onlink = 0;
1641 rcu_read_lock();
1642 idev = __in6_dev_get(dev);
1643 if (idev) {
1644 read_lock_bh(&idev->lock);
1645 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1646 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1647 ifa->prefix_len);
1648 if (onlink)
1649 break;
1650 }
1651 read_unlock_bh(&idev->lock);
1652 }
1653 rcu_read_unlock();
1654 return onlink;
1655 }
1656 EXPORT_SYMBOL(ipv6_chk_prefix);
1657
1658 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1659 struct net_device *dev, int strict)
1660 {
1661 struct inet6_ifaddr *ifp, *result = NULL;
1662 unsigned int hash = inet6_addr_hash(addr);
1663
1664 rcu_read_lock_bh();
1665 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1666 if (!net_eq(dev_net(ifp->idev->dev), net))
1667 continue;
1668 if (ipv6_addr_equal(&ifp->addr, addr)) {
1669 if (!dev || ifp->idev->dev == dev ||
1670 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1671 result = ifp;
1672 in6_ifa_hold(ifp);
1673 break;
1674 }
1675 }
1676 }
1677 rcu_read_unlock_bh();
1678
1679 return result;
1680 }
1681
1682 /* Gets referenced address, destroys ifaddr */
1683
1684 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1685 {
1686 if (ifp->flags&IFA_F_PERMANENT) {
1687 spin_lock_bh(&ifp->lock);
1688 addrconf_del_dad_work(ifp);
1689 ifp->flags |= IFA_F_TENTATIVE;
1690 if (dad_failed)
1691 ifp->flags |= IFA_F_DADFAILED;
1692 spin_unlock_bh(&ifp->lock);
1693 if (dad_failed)
1694 ipv6_ifa_notify(0, ifp);
1695 in6_ifa_put(ifp);
1696 } else if (ifp->flags&IFA_F_TEMPORARY) {
1697 struct inet6_ifaddr *ifpub;
1698 spin_lock_bh(&ifp->lock);
1699 ifpub = ifp->ifpub;
1700 if (ifpub) {
1701 in6_ifa_hold(ifpub);
1702 spin_unlock_bh(&ifp->lock);
1703 ipv6_create_tempaddr(ifpub, ifp);
1704 in6_ifa_put(ifpub);
1705 } else {
1706 spin_unlock_bh(&ifp->lock);
1707 }
1708 ipv6_del_addr(ifp);
1709 } else {
1710 ipv6_del_addr(ifp);
1711 }
1712 }
1713
1714 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1715 {
1716 int err = -ENOENT;
1717
1718 spin_lock_bh(&ifp->lock);
1719 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1720 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1721 err = 0;
1722 }
1723 spin_unlock_bh(&ifp->lock);
1724
1725 return err;
1726 }
1727
1728 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1729 {
1730 struct in6_addr addr;
1731 struct inet6_dev *idev = ifp->idev;
1732 struct net *net = dev_net(ifp->idev->dev);
1733
1734 if (addrconf_dad_end(ifp)) {
1735 in6_ifa_put(ifp);
1736 return;
1737 }
1738
1739 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1740 ifp->idev->dev->name, &ifp->addr);
1741
1742 spin_lock_bh(&ifp->lock);
1743
1744 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1745 int scope = ifp->scope;
1746 u32 flags = ifp->flags;
1747 struct in6_addr new_addr;
1748 struct inet6_ifaddr *ifp2;
1749 u32 valid_lft, preferred_lft;
1750 int pfxlen = ifp->prefix_len;
1751 int retries = ifp->stable_privacy_retry + 1;
1752
1753 if (retries > net->ipv6.sysctl.idgen_retries) {
1754 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1755 ifp->idev->dev->name);
1756 goto errdad;
1757 }
1758
1759 new_addr = ifp->addr;
1760 if (ipv6_generate_stable_address(&new_addr, retries,
1761 idev))
1762 goto errdad;
1763
1764 valid_lft = ifp->valid_lft;
1765 preferred_lft = ifp->prefered_lft;
1766
1767 spin_unlock_bh(&ifp->lock);
1768
1769 if (idev->cnf.max_addresses &&
1770 ipv6_count_addresses(idev) >=
1771 idev->cnf.max_addresses)
1772 goto lock_errdad;
1773
1774 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1775 ifp->idev->dev->name);
1776
1777 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1778 scope, flags, valid_lft,
1779 preferred_lft);
1780 if (IS_ERR(ifp2))
1781 goto lock_errdad;
1782
1783 spin_lock_bh(&ifp2->lock);
1784 ifp2->stable_privacy_retry = retries;
1785 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1786 spin_unlock_bh(&ifp2->lock);
1787
1788 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1789 in6_ifa_put(ifp2);
1790 lock_errdad:
1791 spin_lock_bh(&ifp->lock);
1792 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1793 addr.s6_addr32[0] = htonl(0xfe800000);
1794 addr.s6_addr32[1] = 0;
1795
1796 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1797 ipv6_addr_equal(&ifp->addr, &addr)) {
1798 /* DAD failed for link-local based on MAC address */
1799 idev->cnf.disable_ipv6 = 1;
1800
1801 pr_info("%s: IPv6 being disabled!\n",
1802 ifp->idev->dev->name);
1803 }
1804 }
1805
1806 errdad:
1807 /* transition from _POSTDAD to _ERRDAD */
1808 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1809 spin_unlock_bh(&ifp->lock);
1810
1811 addrconf_mod_dad_work(ifp, 0);
1812 }
1813
1814 /* Join to solicited addr multicast group.
1815 * caller must hold RTNL */
1816 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1817 {
1818 struct in6_addr maddr;
1819
1820 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1821 return;
1822
1823 addrconf_addr_solict_mult(addr, &maddr);
1824 ipv6_dev_mc_inc(dev, &maddr);
1825 }
1826
1827 /* caller must hold RTNL */
1828 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1829 {
1830 struct in6_addr maddr;
1831
1832 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1833 return;
1834
1835 addrconf_addr_solict_mult(addr, &maddr);
1836 __ipv6_dev_mc_dec(idev, &maddr);
1837 }
1838
1839 /* caller must hold RTNL */
1840 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1841 {
1842 struct in6_addr addr;
1843
1844 if (ifp->prefix_len >= 127) /* RFC 6164 */
1845 return;
1846 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1847 if (ipv6_addr_any(&addr))
1848 return;
1849 __ipv6_dev_ac_inc(ifp->idev, &addr);
1850 }
1851
1852 /* caller must hold RTNL */
1853 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1854 {
1855 struct in6_addr addr;
1856
1857 if (ifp->prefix_len >= 127) /* RFC 6164 */
1858 return;
1859 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1860 if (ipv6_addr_any(&addr))
1861 return;
1862 __ipv6_dev_ac_dec(ifp->idev, &addr);
1863 }
1864
1865 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1866 {
1867 if (dev->addr_len != ETH_ALEN)
1868 return -1;
1869 memcpy(eui, dev->dev_addr, 3);
1870 memcpy(eui + 5, dev->dev_addr + 3, 3);
1871
1872 /*
1873 * The zSeries OSA network cards can be shared among various
1874 * OS instances, but the OSA cards have only one MAC address.
1875 * This leads to duplicate address conflicts in conjunction
1876 * with IPv6 if more than one instance uses the same card.
1877 *
1878 * The driver for these cards can deliver a unique 16-bit
1879 * identifier for each instance sharing the same card. It is
1880 * placed instead of 0xFFFE in the interface identifier. The
1881 * "u" bit of the interface identifier is not inverted in this
1882 * case. Hence the resulting interface identifier has local
1883 * scope according to RFC2373.
1884 */
1885 if (dev->dev_id) {
1886 eui[3] = (dev->dev_id >> 8) & 0xFF;
1887 eui[4] = dev->dev_id & 0xFF;
1888 } else {
1889 eui[3] = 0xFF;
1890 eui[4] = 0xFE;
1891 eui[0] ^= 2;
1892 }
1893 return 0;
1894 }
1895
1896 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1897 {
1898 if (dev->addr_len != IEEE802154_ADDR_LEN)
1899 return -1;
1900 memcpy(eui, dev->dev_addr, 8);
1901 eui[0] ^= 2;
1902 return 0;
1903 }
1904
1905 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1906 {
1907 union fwnet_hwaddr *ha;
1908
1909 if (dev->addr_len != FWNET_ALEN)
1910 return -1;
1911
1912 ha = (union fwnet_hwaddr *)dev->dev_addr;
1913
1914 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1915 eui[0] ^= 2;
1916 return 0;
1917 }
1918
1919 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1920 {
1921 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1922 if (dev->addr_len != ARCNET_ALEN)
1923 return -1;
1924 memset(eui, 0, 7);
1925 eui[7] = *(u8 *)dev->dev_addr;
1926 return 0;
1927 }
1928
1929 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1930 {
1931 if (dev->addr_len != INFINIBAND_ALEN)
1932 return -1;
1933 memcpy(eui, dev->dev_addr + 12, 8);
1934 eui[0] |= 2;
1935 return 0;
1936 }
1937
1938 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1939 {
1940 if (addr == 0)
1941 return -1;
1942 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1943 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1944 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1945 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1946 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1947 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1948 eui[1] = 0;
1949 eui[2] = 0x5E;
1950 eui[3] = 0xFE;
1951 memcpy(eui + 4, &addr, 4);
1952 return 0;
1953 }
1954
1955 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1956 {
1957 if (dev->priv_flags & IFF_ISATAP)
1958 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1959 return -1;
1960 }
1961
1962 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1963 {
1964 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1965 }
1966
1967 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1968 {
1969 memcpy(eui, dev->perm_addr, 3);
1970 memcpy(eui + 5, dev->perm_addr + 3, 3);
1971 eui[3] = 0xFF;
1972 eui[4] = 0xFE;
1973 eui[0] ^= 2;
1974 return 0;
1975 }
1976
1977 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1978 {
1979 switch (dev->type) {
1980 case ARPHRD_ETHER:
1981 case ARPHRD_FDDI:
1982 return addrconf_ifid_eui48(eui, dev);
1983 case ARPHRD_ARCNET:
1984 return addrconf_ifid_arcnet(eui, dev);
1985 case ARPHRD_INFINIBAND:
1986 return addrconf_ifid_infiniband(eui, dev);
1987 case ARPHRD_SIT:
1988 return addrconf_ifid_sit(eui, dev);
1989 case ARPHRD_IPGRE:
1990 return addrconf_ifid_gre(eui, dev);
1991 case ARPHRD_6LOWPAN:
1992 case ARPHRD_IEEE802154:
1993 return addrconf_ifid_eui64(eui, dev);
1994 case ARPHRD_IEEE1394:
1995 return addrconf_ifid_ieee1394(eui, dev);
1996 case ARPHRD_TUNNEL6:
1997 return addrconf_ifid_ip6tnl(eui, dev);
1998 }
1999 return -1;
2000 }
2001
2002 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2003 {
2004 int err = -1;
2005 struct inet6_ifaddr *ifp;
2006
2007 read_lock_bh(&idev->lock);
2008 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2009 if (ifp->scope > IFA_LINK)
2010 break;
2011 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2012 memcpy(eui, ifp->addr.s6_addr+8, 8);
2013 err = 0;
2014 break;
2015 }
2016 }
2017 read_unlock_bh(&idev->lock);
2018 return err;
2019 }
2020
2021 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2022 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2023 {
2024 regen:
2025 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2026 idev->rndid[0] &= ~0x02;
2027
2028 /*
2029 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2030 * check if generated address is not inappropriate
2031 *
2032 * - Reserved subnet anycast (RFC 2526)
2033 * 11111101 11....11 1xxxxxxx
2034 * - ISATAP (RFC4214) 6.1
2035 * 00-00-5E-FE-xx-xx-xx-xx
2036 * - value 0
2037 * - XXX: already assigned to an address on the device
2038 */
2039 if (idev->rndid[0] == 0xfd &&
2040 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2041 (idev->rndid[7]&0x80))
2042 goto regen;
2043 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2044 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2045 goto regen;
2046 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2047 goto regen;
2048 }
2049 }
2050
2051 static void ipv6_regen_rndid(unsigned long data)
2052 {
2053 struct inet6_dev *idev = (struct inet6_dev *) data;
2054 unsigned long expires;
2055
2056 rcu_read_lock_bh();
2057 write_lock_bh(&idev->lock);
2058
2059 if (idev->dead)
2060 goto out;
2061
2062 __ipv6_regen_rndid(idev);
2063
2064 expires = jiffies +
2065 idev->cnf.temp_prefered_lft * HZ -
2066 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2067 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2068 idev->cnf.max_desync_factor * HZ;
2069 if (time_before(expires, jiffies)) {
2070 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2071 __func__, idev->dev->name);
2072 goto out;
2073 }
2074
2075 if (!mod_timer(&idev->regen_timer, expires))
2076 in6_dev_hold(idev);
2077
2078 out:
2079 write_unlock_bh(&idev->lock);
2080 rcu_read_unlock_bh();
2081 in6_dev_put(idev);
2082 }
2083
2084 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2085 {
2086 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2087 __ipv6_regen_rndid(idev);
2088 }
2089
2090 /*
2091 * Add prefix route.
2092 */
2093
2094 static void
2095 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2096 unsigned long expires, u32 flags)
2097 {
2098 struct fib6_config cfg = {
2099 .fc_table = RT6_TABLE_PREFIX,
2100 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2101 .fc_ifindex = dev->ifindex,
2102 .fc_expires = expires,
2103 .fc_dst_len = plen,
2104 .fc_flags = RTF_UP | flags,
2105 .fc_nlinfo.nl_net = dev_net(dev),
2106 .fc_protocol = RTPROT_KERNEL,
2107 };
2108
2109 cfg.fc_dst = *pfx;
2110
2111 /* Prevent useless cloning on PtP SIT.
2112 This thing is done here expecting that the whole
2113 class of non-broadcast devices need not cloning.
2114 */
2115 #if IS_ENABLED(CONFIG_IPV6_SIT)
2116 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2117 cfg.fc_flags |= RTF_NONEXTHOP;
2118 #endif
2119
2120 ip6_route_add(&cfg);
2121 }
2122
2123
2124 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2125 int plen,
2126 const struct net_device *dev,
2127 u32 flags, u32 noflags)
2128 {
2129 struct fib6_node *fn;
2130 struct rt6_info *rt = NULL;
2131 struct fib6_table *table;
2132
2133 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2134 if (!table)
2135 return NULL;
2136
2137 read_lock_bh(&table->tb6_lock);
2138 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2139 if (!fn)
2140 goto out;
2141
2142 noflags |= RTF_CACHE;
2143 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2144 if (rt->dst.dev->ifindex != dev->ifindex)
2145 continue;
2146 if ((rt->rt6i_flags & flags) != flags)
2147 continue;
2148 if ((rt->rt6i_flags & noflags) != 0)
2149 continue;
2150 dst_hold(&rt->dst);
2151 break;
2152 }
2153 out:
2154 read_unlock_bh(&table->tb6_lock);
2155 return rt;
2156 }
2157
2158
2159 /* Create "default" multicast route to the interface */
2160
2161 static void addrconf_add_mroute(struct net_device *dev)
2162 {
2163 struct fib6_config cfg = {
2164 .fc_table = RT6_TABLE_LOCAL,
2165 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2166 .fc_ifindex = dev->ifindex,
2167 .fc_dst_len = 8,
2168 .fc_flags = RTF_UP,
2169 .fc_nlinfo.nl_net = dev_net(dev),
2170 };
2171
2172 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2173
2174 ip6_route_add(&cfg);
2175 }
2176
2177 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2178 {
2179 struct inet6_dev *idev;
2180
2181 ASSERT_RTNL();
2182
2183 idev = ipv6_find_idev(dev);
2184 if (!idev)
2185 return ERR_PTR(-ENOBUFS);
2186
2187 if (idev->cnf.disable_ipv6)
2188 return ERR_PTR(-EACCES);
2189
2190 /* Add default multicast route */
2191 if (!(dev->flags & IFF_LOOPBACK))
2192 addrconf_add_mroute(dev);
2193
2194 return idev;
2195 }
2196
2197 static void manage_tempaddrs(struct inet6_dev *idev,
2198 struct inet6_ifaddr *ifp,
2199 __u32 valid_lft, __u32 prefered_lft,
2200 bool create, unsigned long now)
2201 {
2202 u32 flags;
2203 struct inet6_ifaddr *ift;
2204
2205 read_lock_bh(&idev->lock);
2206 /* update all temporary addresses in the list */
2207 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2208 int age, max_valid, max_prefered;
2209
2210 if (ifp != ift->ifpub)
2211 continue;
2212
2213 /* RFC 4941 section 3.3:
2214 * If a received option will extend the lifetime of a public
2215 * address, the lifetimes of temporary addresses should
2216 * be extended, subject to the overall constraint that no
2217 * temporary addresses should ever remain "valid" or "preferred"
2218 * for a time longer than (TEMP_VALID_LIFETIME) or
2219 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2220 */
2221 age = (now - ift->cstamp) / HZ;
2222 max_valid = idev->cnf.temp_valid_lft - age;
2223 if (max_valid < 0)
2224 max_valid = 0;
2225
2226 max_prefered = idev->cnf.temp_prefered_lft -
2227 idev->cnf.max_desync_factor - age;
2228 if (max_prefered < 0)
2229 max_prefered = 0;
2230
2231 if (valid_lft > max_valid)
2232 valid_lft = max_valid;
2233
2234 if (prefered_lft > max_prefered)
2235 prefered_lft = max_prefered;
2236
2237 spin_lock(&ift->lock);
2238 flags = ift->flags;
2239 ift->valid_lft = valid_lft;
2240 ift->prefered_lft = prefered_lft;
2241 ift->tstamp = now;
2242 if (prefered_lft > 0)
2243 ift->flags &= ~IFA_F_DEPRECATED;
2244
2245 spin_unlock(&ift->lock);
2246 if (!(flags&IFA_F_TENTATIVE))
2247 ipv6_ifa_notify(0, ift);
2248 }
2249
2250 if ((create || list_empty(&idev->tempaddr_list)) &&
2251 idev->cnf.use_tempaddr > 0) {
2252 /* When a new public address is created as described
2253 * in [ADDRCONF], also create a new temporary address.
2254 * Also create a temporary address if it's enabled but
2255 * no temporary address currently exists.
2256 */
2257 read_unlock_bh(&idev->lock);
2258 ipv6_create_tempaddr(ifp, NULL);
2259 } else {
2260 read_unlock_bh(&idev->lock);
2261 }
2262 }
2263
2264 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2265 {
2266 struct prefix_info *pinfo;
2267 __u32 valid_lft;
2268 __u32 prefered_lft;
2269 int addr_type;
2270 u32 addr_flags = 0;
2271 struct inet6_dev *in6_dev;
2272 struct net *net = dev_net(dev);
2273
2274 pinfo = (struct prefix_info *) opt;
2275
2276 if (len < sizeof(struct prefix_info)) {
2277 ADBG("addrconf: prefix option too short\n");
2278 return;
2279 }
2280
2281 /*
2282 * Validation checks ([ADDRCONF], page 19)
2283 */
2284
2285 addr_type = ipv6_addr_type(&pinfo->prefix);
2286
2287 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2288 return;
2289
2290 valid_lft = ntohl(pinfo->valid);
2291 prefered_lft = ntohl(pinfo->prefered);
2292
2293 if (prefered_lft > valid_lft) {
2294 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2295 return;
2296 }
2297
2298 in6_dev = in6_dev_get(dev);
2299
2300 if (!in6_dev) {
2301 net_dbg_ratelimited("addrconf: device %s not configured\n",
2302 dev->name);
2303 return;
2304 }
2305
2306 /*
2307 * Two things going on here:
2308 * 1) Add routes for on-link prefixes
2309 * 2) Configure prefixes with the auto flag set
2310 */
2311
2312 if (pinfo->onlink) {
2313 struct rt6_info *rt;
2314 unsigned long rt_expires;
2315
2316 /* Avoid arithmetic overflow. Really, we could
2317 * save rt_expires in seconds, likely valid_lft,
2318 * but it would require division in fib gc, that it
2319 * not good.
2320 */
2321 if (HZ > USER_HZ)
2322 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2323 else
2324 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2325
2326 if (addrconf_finite_timeout(rt_expires))
2327 rt_expires *= HZ;
2328
2329 rt = addrconf_get_prefix_route(&pinfo->prefix,
2330 pinfo->prefix_len,
2331 dev,
2332 RTF_ADDRCONF | RTF_PREFIX_RT,
2333 RTF_GATEWAY | RTF_DEFAULT);
2334
2335 if (rt) {
2336 /* Autoconf prefix route */
2337 if (valid_lft == 0) {
2338 ip6_del_rt(rt);
2339 rt = NULL;
2340 } else if (addrconf_finite_timeout(rt_expires)) {
2341 /* not infinity */
2342 rt6_set_expires(rt, jiffies + rt_expires);
2343 } else {
2344 rt6_clean_expires(rt);
2345 }
2346 } else if (valid_lft) {
2347 clock_t expires = 0;
2348 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2349 if (addrconf_finite_timeout(rt_expires)) {
2350 /* not infinity */
2351 flags |= RTF_EXPIRES;
2352 expires = jiffies_to_clock_t(rt_expires);
2353 }
2354 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2355 dev, expires, flags);
2356 }
2357 ip6_rt_put(rt);
2358 }
2359
2360 /* Try to figure out our local address for this prefix */
2361
2362 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2363 struct inet6_ifaddr *ifp;
2364 struct in6_addr addr;
2365 int create = 0, update_lft = 0;
2366 bool tokenized = false;
2367
2368 if (pinfo->prefix_len == 64) {
2369 memcpy(&addr, &pinfo->prefix, 8);
2370
2371 if (!ipv6_addr_any(&in6_dev->token)) {
2372 read_lock_bh(&in6_dev->lock);
2373 memcpy(addr.s6_addr + 8,
2374 in6_dev->token.s6_addr + 8, 8);
2375 read_unlock_bh(&in6_dev->lock);
2376 tokenized = true;
2377 } else if (in6_dev->addr_gen_mode ==
2378 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2379 !ipv6_generate_stable_address(&addr, 0,
2380 in6_dev)) {
2381 addr_flags |= IFA_F_STABLE_PRIVACY;
2382 goto ok;
2383 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2384 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2385 in6_dev_put(in6_dev);
2386 return;
2387 }
2388 goto ok;
2389 }
2390 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2391 pinfo->prefix_len);
2392 in6_dev_put(in6_dev);
2393 return;
2394
2395 ok:
2396
2397 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2398
2399 if (!ifp && valid_lft) {
2400 int max_addresses = in6_dev->cnf.max_addresses;
2401
2402 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2403 if (in6_dev->cnf.optimistic_dad &&
2404 !net->ipv6.devconf_all->forwarding && sllao)
2405 addr_flags = IFA_F_OPTIMISTIC;
2406 #endif
2407
2408 /* Do not allow to create too much of autoconfigured
2409 * addresses; this would be too easy way to crash kernel.
2410 */
2411 if (!max_addresses ||
2412 ipv6_count_addresses(in6_dev) < max_addresses)
2413 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2414 pinfo->prefix_len,
2415 addr_type&IPV6_ADDR_SCOPE_MASK,
2416 addr_flags, valid_lft,
2417 prefered_lft);
2418
2419 if (IS_ERR_OR_NULL(ifp)) {
2420 in6_dev_put(in6_dev);
2421 return;
2422 }
2423
2424 update_lft = 0;
2425 create = 1;
2426 spin_lock_bh(&ifp->lock);
2427 ifp->flags |= IFA_F_MANAGETEMPADDR;
2428 ifp->cstamp = jiffies;
2429 ifp->tokenized = tokenized;
2430 spin_unlock_bh(&ifp->lock);
2431 addrconf_dad_start(ifp);
2432 }
2433
2434 if (ifp) {
2435 u32 flags;
2436 unsigned long now;
2437 u32 stored_lft;
2438
2439 /* update lifetime (RFC2462 5.5.3 e) */
2440 spin_lock_bh(&ifp->lock);
2441 now = jiffies;
2442 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2443 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2444 else
2445 stored_lft = 0;
2446 if (!update_lft && !create && stored_lft) {
2447 const u32 minimum_lft = min_t(u32,
2448 stored_lft, MIN_VALID_LIFETIME);
2449 valid_lft = max(valid_lft, minimum_lft);
2450
2451 /* RFC4862 Section 5.5.3e:
2452 * "Note that the preferred lifetime of the
2453 * corresponding address is always reset to
2454 * the Preferred Lifetime in the received
2455 * Prefix Information option, regardless of
2456 * whether the valid lifetime is also reset or
2457 * ignored."
2458 *
2459 * So we should always update prefered_lft here.
2460 */
2461 update_lft = 1;
2462 }
2463
2464 if (update_lft) {
2465 ifp->valid_lft = valid_lft;
2466 ifp->prefered_lft = prefered_lft;
2467 ifp->tstamp = now;
2468 flags = ifp->flags;
2469 ifp->flags &= ~IFA_F_DEPRECATED;
2470 spin_unlock_bh(&ifp->lock);
2471
2472 if (!(flags&IFA_F_TENTATIVE))
2473 ipv6_ifa_notify(0, ifp);
2474 } else
2475 spin_unlock_bh(&ifp->lock);
2476
2477 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2478 create, now);
2479
2480 in6_ifa_put(ifp);
2481 addrconf_verify();
2482 }
2483 }
2484 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2485 in6_dev_put(in6_dev);
2486 }
2487
2488 /*
2489 * Set destination address.
2490 * Special case for SIT interfaces where we create a new "virtual"
2491 * device.
2492 */
2493 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2494 {
2495 struct in6_ifreq ireq;
2496 struct net_device *dev;
2497 int err = -EINVAL;
2498
2499 rtnl_lock();
2500
2501 err = -EFAULT;
2502 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2503 goto err_exit;
2504
2505 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2506
2507 err = -ENODEV;
2508 if (!dev)
2509 goto err_exit;
2510
2511 #if IS_ENABLED(CONFIG_IPV6_SIT)
2512 if (dev->type == ARPHRD_SIT) {
2513 const struct net_device_ops *ops = dev->netdev_ops;
2514 struct ifreq ifr;
2515 struct ip_tunnel_parm p;
2516
2517 err = -EADDRNOTAVAIL;
2518 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2519 goto err_exit;
2520
2521 memset(&p, 0, sizeof(p));
2522 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2523 p.iph.saddr = 0;
2524 p.iph.version = 4;
2525 p.iph.ihl = 5;
2526 p.iph.protocol = IPPROTO_IPV6;
2527 p.iph.ttl = 64;
2528 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2529
2530 if (ops->ndo_do_ioctl) {
2531 mm_segment_t oldfs = get_fs();
2532
2533 set_fs(KERNEL_DS);
2534 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2535 set_fs(oldfs);
2536 } else
2537 err = -EOPNOTSUPP;
2538
2539 if (err == 0) {
2540 err = -ENOBUFS;
2541 dev = __dev_get_by_name(net, p.name);
2542 if (!dev)
2543 goto err_exit;
2544 err = dev_open(dev);
2545 }
2546 }
2547 #endif
2548
2549 err_exit:
2550 rtnl_unlock();
2551 return err;
2552 }
2553
2554 static int ipv6_mc_config(struct sock *sk, bool join,
2555 const struct in6_addr *addr, int ifindex)
2556 {
2557 int ret;
2558
2559 ASSERT_RTNL();
2560
2561 lock_sock(sk);
2562 if (join)
2563 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2564 else
2565 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2566 release_sock(sk);
2567
2568 return ret;
2569 }
2570
2571 /*
2572 * Manual configuration of address on an interface
2573 */
2574 static int inet6_addr_add(struct net *net, int ifindex,
2575 const struct in6_addr *pfx,
2576 const struct in6_addr *peer_pfx,
2577 unsigned int plen, __u32 ifa_flags,
2578 __u32 prefered_lft, __u32 valid_lft)
2579 {
2580 struct inet6_ifaddr *ifp;
2581 struct inet6_dev *idev;
2582 struct net_device *dev;
2583 unsigned long timeout;
2584 clock_t expires;
2585 int scope;
2586 u32 flags;
2587
2588 ASSERT_RTNL();
2589
2590 if (plen > 128)
2591 return -EINVAL;
2592
2593 /* check the lifetime */
2594 if (!valid_lft || prefered_lft > valid_lft)
2595 return -EINVAL;
2596
2597 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2598 return -EINVAL;
2599
2600 dev = __dev_get_by_index(net, ifindex);
2601 if (!dev)
2602 return -ENODEV;
2603
2604 idev = addrconf_add_dev(dev);
2605 if (IS_ERR(idev))
2606 return PTR_ERR(idev);
2607
2608 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2609 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2610 true, pfx, ifindex);
2611
2612 if (ret < 0)
2613 return ret;
2614 }
2615
2616 scope = ipv6_addr_scope(pfx);
2617
2618 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2619 if (addrconf_finite_timeout(timeout)) {
2620 expires = jiffies_to_clock_t(timeout * HZ);
2621 valid_lft = timeout;
2622 flags = RTF_EXPIRES;
2623 } else {
2624 expires = 0;
2625 flags = 0;
2626 ifa_flags |= IFA_F_PERMANENT;
2627 }
2628
2629 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2630 if (addrconf_finite_timeout(timeout)) {
2631 if (timeout == 0)
2632 ifa_flags |= IFA_F_DEPRECATED;
2633 prefered_lft = timeout;
2634 }
2635
2636 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2637 valid_lft, prefered_lft);
2638
2639 if (!IS_ERR(ifp)) {
2640 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2641 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2642 expires, flags);
2643 }
2644
2645 /*
2646 * Note that section 3.1 of RFC 4429 indicates
2647 * that the Optimistic flag should not be set for
2648 * manually configured addresses
2649 */
2650 addrconf_dad_start(ifp);
2651 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2652 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2653 true, jiffies);
2654 in6_ifa_put(ifp);
2655 addrconf_verify_rtnl();
2656 return 0;
2657 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2658 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2659 false, pfx, ifindex);
2660 }
2661
2662 return PTR_ERR(ifp);
2663 }
2664
2665 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2666 const struct in6_addr *pfx, unsigned int plen)
2667 {
2668 struct inet6_ifaddr *ifp;
2669 struct inet6_dev *idev;
2670 struct net_device *dev;
2671
2672 if (plen > 128)
2673 return -EINVAL;
2674
2675 dev = __dev_get_by_index(net, ifindex);
2676 if (!dev)
2677 return -ENODEV;
2678
2679 idev = __in6_dev_get(dev);
2680 if (!idev)
2681 return -ENXIO;
2682
2683 read_lock_bh(&idev->lock);
2684 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2685 if (ifp->prefix_len == plen &&
2686 ipv6_addr_equal(pfx, &ifp->addr)) {
2687 in6_ifa_hold(ifp);
2688 read_unlock_bh(&idev->lock);
2689
2690 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2691 (ifa_flags & IFA_F_MANAGETEMPADDR))
2692 manage_tempaddrs(idev, ifp, 0, 0, false,
2693 jiffies);
2694 ipv6_del_addr(ifp);
2695 addrconf_verify_rtnl();
2696 if (ipv6_addr_is_multicast(pfx)) {
2697 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2698 false, pfx, dev->ifindex);
2699 }
2700 return 0;
2701 }
2702 }
2703 read_unlock_bh(&idev->lock);
2704 return -EADDRNOTAVAIL;
2705 }
2706
2707
2708 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2709 {
2710 struct in6_ifreq ireq;
2711 int err;
2712
2713 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2714 return -EPERM;
2715
2716 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2717 return -EFAULT;
2718
2719 rtnl_lock();
2720 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2721 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2722 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2723 rtnl_unlock();
2724 return err;
2725 }
2726
2727 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2728 {
2729 struct in6_ifreq ireq;
2730 int err;
2731
2732 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2733 return -EPERM;
2734
2735 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2736 return -EFAULT;
2737
2738 rtnl_lock();
2739 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2740 ireq.ifr6_prefixlen);
2741 rtnl_unlock();
2742 return err;
2743 }
2744
2745 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2746 int plen, int scope)
2747 {
2748 struct inet6_ifaddr *ifp;
2749
2750 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2751 scope, IFA_F_PERMANENT,
2752 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2753 if (!IS_ERR(ifp)) {
2754 spin_lock_bh(&ifp->lock);
2755 ifp->flags &= ~IFA_F_TENTATIVE;
2756 spin_unlock_bh(&ifp->lock);
2757 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2758 in6_ifa_put(ifp);
2759 }
2760 }
2761
2762 #if IS_ENABLED(CONFIG_IPV6_SIT)
2763 static void sit_add_v4_addrs(struct inet6_dev *idev)
2764 {
2765 struct in6_addr addr;
2766 struct net_device *dev;
2767 struct net *net = dev_net(idev->dev);
2768 int scope, plen;
2769 u32 pflags = 0;
2770
2771 ASSERT_RTNL();
2772
2773 memset(&addr, 0, sizeof(struct in6_addr));
2774 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2775
2776 if (idev->dev->flags&IFF_POINTOPOINT) {
2777 addr.s6_addr32[0] = htonl(0xfe800000);
2778 scope = IFA_LINK;
2779 plen = 64;
2780 } else {
2781 scope = IPV6_ADDR_COMPATv4;
2782 plen = 96;
2783 pflags |= RTF_NONEXTHOP;
2784 }
2785
2786 if (addr.s6_addr32[3]) {
2787 add_addr(idev, &addr, plen, scope);
2788 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2789 return;
2790 }
2791
2792 for_each_netdev(net, dev) {
2793 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2794 if (in_dev && (dev->flags & IFF_UP)) {
2795 struct in_ifaddr *ifa;
2796
2797 int flag = scope;
2798
2799 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2800
2801 addr.s6_addr32[3] = ifa->ifa_local;
2802
2803 if (ifa->ifa_scope == RT_SCOPE_LINK)
2804 continue;
2805 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2806 if (idev->dev->flags&IFF_POINTOPOINT)
2807 continue;
2808 flag |= IFA_HOST;
2809 }
2810
2811 add_addr(idev, &addr, plen, flag);
2812 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2813 pflags);
2814 }
2815 }
2816 }
2817 }
2818 #endif
2819
2820 static void init_loopback(struct net_device *dev)
2821 {
2822 struct inet6_dev *idev;
2823 struct net_device *sp_dev;
2824 struct inet6_ifaddr *sp_ifa;
2825 struct rt6_info *sp_rt;
2826
2827 /* ::1 */
2828
2829 ASSERT_RTNL();
2830
2831 idev = ipv6_find_idev(dev);
2832 if (!idev) {
2833 pr_debug("%s: add_dev failed\n", __func__);
2834 return;
2835 }
2836
2837 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2838
2839 /* Add routes to other interface's IPv6 addresses */
2840 for_each_netdev(dev_net(dev), sp_dev) {
2841 if (!strcmp(sp_dev->name, dev->name))
2842 continue;
2843
2844 idev = __in6_dev_get(sp_dev);
2845 if (!idev)
2846 continue;
2847
2848 read_lock_bh(&idev->lock);
2849 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2850
2851 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2852 continue;
2853
2854 if (sp_ifa->rt) {
2855 /* This dst has been added to garbage list when
2856 * lo device down, release this obsolete dst and
2857 * reallocate a new router for ifa.
2858 */
2859 if (sp_ifa->rt->dst.obsolete > 0) {
2860 ip6_rt_put(sp_ifa->rt);
2861 sp_ifa->rt = NULL;
2862 } else {
2863 continue;
2864 }
2865 }
2866
2867 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2868
2869 /* Failure cases are ignored */
2870 if (!IS_ERR(sp_rt)) {
2871 sp_ifa->rt = sp_rt;
2872 ip6_ins_rt(sp_rt);
2873 }
2874 }
2875 read_unlock_bh(&idev->lock);
2876 }
2877 }
2878
2879 static void addrconf_add_linklocal(struct inet6_dev *idev,
2880 const struct in6_addr *addr, u32 flags)
2881 {
2882 struct inet6_ifaddr *ifp;
2883 u32 addr_flags = flags | IFA_F_PERMANENT;
2884
2885 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2886 if (idev->cnf.optimistic_dad &&
2887 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2888 addr_flags |= IFA_F_OPTIMISTIC;
2889 #endif
2890
2891 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2892 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2893 if (!IS_ERR(ifp)) {
2894 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2895 addrconf_dad_start(ifp);
2896 in6_ifa_put(ifp);
2897 }
2898 }
2899
2900 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2901 {
2902 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2903 return true;
2904
2905 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2906 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2907 return true;
2908
2909 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2910 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2911 return true;
2912
2913 return false;
2914 }
2915
2916 static int ipv6_generate_stable_address(struct in6_addr *address,
2917 u8 dad_count,
2918 const struct inet6_dev *idev)
2919 {
2920 static DEFINE_SPINLOCK(lock);
2921 static __u32 digest[SHA_DIGEST_WORDS];
2922 static __u32 workspace[SHA_WORKSPACE_WORDS];
2923
2924 static union {
2925 char __data[SHA_MESSAGE_BYTES];
2926 struct {
2927 struct in6_addr secret;
2928 __be32 prefix[2];
2929 unsigned char hwaddr[MAX_ADDR_LEN];
2930 u8 dad_count;
2931 } __packed;
2932 } data;
2933
2934 struct in6_addr secret;
2935 struct in6_addr temp;
2936 struct net *net = dev_net(idev->dev);
2937
2938 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2939
2940 if (idev->cnf.stable_secret.initialized)
2941 secret = idev->cnf.stable_secret.secret;
2942 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
2943 secret = net->ipv6.devconf_dflt->stable_secret.secret;
2944 else
2945 return -1;
2946
2947 retry:
2948 spin_lock_bh(&lock);
2949
2950 sha_init(digest);
2951 memset(&data, 0, sizeof(data));
2952 memset(workspace, 0, sizeof(workspace));
2953 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
2954 data.prefix[0] = address->s6_addr32[0];
2955 data.prefix[1] = address->s6_addr32[1];
2956 data.secret = secret;
2957 data.dad_count = dad_count;
2958
2959 sha_transform(digest, data.__data, workspace);
2960
2961 temp = *address;
2962 temp.s6_addr32[2] = (__force __be32)digest[0];
2963 temp.s6_addr32[3] = (__force __be32)digest[1];
2964
2965 spin_unlock_bh(&lock);
2966
2967 if (ipv6_reserved_interfaceid(temp)) {
2968 dad_count++;
2969 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
2970 return -1;
2971 goto retry;
2972 }
2973
2974 *address = temp;
2975 return 0;
2976 }
2977
2978 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
2979 {
2980 struct in6_addr addr;
2981
2982 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2983
2984 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
2985 if (!ipv6_generate_stable_address(&addr, 0, idev))
2986 addrconf_add_linklocal(idev, &addr,
2987 IFA_F_STABLE_PRIVACY);
2988 else if (prefix_route)
2989 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2990 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
2991 /* addrconf_add_linklocal also adds a prefix_route and we
2992 * only need to care about prefix routes if ipv6_generate_eui64
2993 * couldn't generate one.
2994 */
2995 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
2996 addrconf_add_linklocal(idev, &addr, 0);
2997 else if (prefix_route)
2998 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2999 }
3000 }
3001
3002 static void addrconf_dev_config(struct net_device *dev)
3003 {
3004 struct inet6_dev *idev;
3005
3006 ASSERT_RTNL();
3007
3008 if ((dev->type != ARPHRD_ETHER) &&
3009 (dev->type != ARPHRD_FDDI) &&
3010 (dev->type != ARPHRD_ARCNET) &&
3011 (dev->type != ARPHRD_INFINIBAND) &&
3012 (dev->type != ARPHRD_IEEE802154) &&
3013 (dev->type != ARPHRD_IEEE1394) &&
3014 (dev->type != ARPHRD_TUNNEL6) &&
3015 (dev->type != ARPHRD_6LOWPAN)) {
3016 /* Alas, we support only Ethernet autoconfiguration. */
3017 return;
3018 }
3019
3020 idev = addrconf_add_dev(dev);
3021 if (IS_ERR(idev))
3022 return;
3023
3024 addrconf_addr_gen(idev, false);
3025 }
3026
3027 #if IS_ENABLED(CONFIG_IPV6_SIT)
3028 static void addrconf_sit_config(struct net_device *dev)
3029 {
3030 struct inet6_dev *idev;
3031
3032 ASSERT_RTNL();
3033
3034 /*
3035 * Configure the tunnel with one of our IPv4
3036 * addresses... we should configure all of
3037 * our v4 addrs in the tunnel
3038 */
3039
3040 idev = ipv6_find_idev(dev);
3041 if (!idev) {
3042 pr_debug("%s: add_dev failed\n", __func__);
3043 return;
3044 }
3045
3046 if (dev->priv_flags & IFF_ISATAP) {
3047 addrconf_addr_gen(idev, false);
3048 return;
3049 }
3050
3051 sit_add_v4_addrs(idev);
3052
3053 if (dev->flags&IFF_POINTOPOINT)
3054 addrconf_add_mroute(dev);
3055 }
3056 #endif
3057
3058 #if IS_ENABLED(CONFIG_NET_IPGRE)
3059 static void addrconf_gre_config(struct net_device *dev)
3060 {
3061 struct inet6_dev *idev;
3062
3063 ASSERT_RTNL();
3064
3065 idev = ipv6_find_idev(dev);
3066 if (!idev) {
3067 pr_debug("%s: add_dev failed\n", __func__);
3068 return;
3069 }
3070
3071 addrconf_addr_gen(idev, true);
3072 }
3073 #endif
3074
3075 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3076 void *ptr)
3077 {
3078 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3079 struct inet6_dev *idev = __in6_dev_get(dev);
3080 int run_pending = 0;
3081 int err;
3082
3083 switch (event) {
3084 case NETDEV_REGISTER:
3085 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3086 idev = ipv6_add_dev(dev);
3087 if (IS_ERR(idev))
3088 return notifier_from_errno(PTR_ERR(idev));
3089 }
3090 break;
3091
3092 case NETDEV_UP:
3093 case NETDEV_CHANGE:
3094 if (dev->flags & IFF_SLAVE)
3095 break;
3096
3097 if (idev && idev->cnf.disable_ipv6)
3098 break;
3099
3100 if (event == NETDEV_UP) {
3101 if (!addrconf_qdisc_ok(dev)) {
3102 /* device is not ready yet. */
3103 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3104 dev->name);
3105 break;
3106 }
3107
3108 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3109 idev = ipv6_add_dev(dev);
3110
3111 if (!IS_ERR_OR_NULL(idev)) {
3112 idev->if_flags |= IF_READY;
3113 run_pending = 1;
3114 }
3115 } else {
3116 if (!addrconf_qdisc_ok(dev)) {
3117 /* device is still not ready. */
3118 break;
3119 }
3120
3121 if (idev) {
3122 if (idev->if_flags & IF_READY)
3123 /* device is already configured. */
3124 break;
3125 idev->if_flags |= IF_READY;
3126 }
3127
3128 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3129 dev->name);
3130
3131 run_pending = 1;
3132 }
3133
3134 switch (dev->type) {
3135 #if IS_ENABLED(CONFIG_IPV6_SIT)
3136 case ARPHRD_SIT:
3137 addrconf_sit_config(dev);
3138 break;
3139 #endif
3140 #if IS_ENABLED(CONFIG_NET_IPGRE)
3141 case ARPHRD_IPGRE:
3142 addrconf_gre_config(dev);
3143 break;
3144 #endif
3145 case ARPHRD_LOOPBACK:
3146 init_loopback(dev);
3147 break;
3148
3149 default:
3150 addrconf_dev_config(dev);
3151 break;
3152 }
3153
3154 if (!IS_ERR_OR_NULL(idev)) {
3155 if (run_pending)
3156 addrconf_dad_run(idev);
3157
3158 /*
3159 * If the MTU changed during the interface down,
3160 * when the interface up, the changed MTU must be
3161 * reflected in the idev as well as routers.
3162 */
3163 if (idev->cnf.mtu6 != dev->mtu &&
3164 dev->mtu >= IPV6_MIN_MTU) {
3165 rt6_mtu_change(dev, dev->mtu);
3166 idev->cnf.mtu6 = dev->mtu;
3167 }
3168 idev->tstamp = jiffies;
3169 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3170
3171 /*
3172 * If the changed mtu during down is lower than
3173 * IPV6_MIN_MTU stop IPv6 on this interface.
3174 */
3175 if (dev->mtu < IPV6_MIN_MTU)
3176 addrconf_ifdown(dev, 1);
3177 }
3178 break;
3179
3180 case NETDEV_CHANGEMTU:
3181 if (idev && dev->mtu >= IPV6_MIN_MTU) {
3182 rt6_mtu_change(dev, dev->mtu);
3183 idev->cnf.mtu6 = dev->mtu;
3184 break;
3185 }
3186
3187 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3188 idev = ipv6_add_dev(dev);
3189 if (!IS_ERR(idev))
3190 break;
3191 }
3192
3193 /*
3194 * if MTU under IPV6_MIN_MTU.
3195 * Stop IPv6 on this interface.
3196 */
3197
3198 case NETDEV_DOWN:
3199 case NETDEV_UNREGISTER:
3200 /*
3201 * Remove all addresses from this interface.
3202 */
3203 addrconf_ifdown(dev, event != NETDEV_DOWN);
3204 break;
3205
3206 case NETDEV_CHANGENAME:
3207 if (idev) {
3208 snmp6_unregister_dev(idev);
3209 addrconf_sysctl_unregister(idev);
3210 err = addrconf_sysctl_register(idev);
3211 if (err)
3212 return notifier_from_errno(err);
3213 err = snmp6_register_dev(idev);
3214 if (err) {
3215 addrconf_sysctl_unregister(idev);
3216 return notifier_from_errno(err);
3217 }
3218 }
3219 break;
3220
3221 case NETDEV_PRE_TYPE_CHANGE:
3222 case NETDEV_POST_TYPE_CHANGE:
3223 addrconf_type_change(dev, event);
3224 break;
3225 }
3226
3227 return NOTIFY_OK;
3228 }
3229
3230 /*
3231 * addrconf module should be notified of a device going up
3232 */
3233 static struct notifier_block ipv6_dev_notf = {
3234 .notifier_call = addrconf_notify,
3235 };
3236
3237 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3238 {
3239 struct inet6_dev *idev;
3240 ASSERT_RTNL();
3241
3242 idev = __in6_dev_get(dev);
3243
3244 if (event == NETDEV_POST_TYPE_CHANGE)
3245 ipv6_mc_remap(idev);
3246 else if (event == NETDEV_PRE_TYPE_CHANGE)
3247 ipv6_mc_unmap(idev);
3248 }
3249
3250 static int addrconf_ifdown(struct net_device *dev, int how)
3251 {
3252 struct net *net = dev_net(dev);
3253 struct inet6_dev *idev;
3254 struct inet6_ifaddr *ifa;
3255 int state, i;
3256
3257 ASSERT_RTNL();
3258
3259 rt6_ifdown(net, dev);
3260 neigh_ifdown(&nd_tbl, dev);
3261
3262 idev = __in6_dev_get(dev);
3263 if (!idev)
3264 return -ENODEV;
3265
3266 /*
3267 * Step 1: remove reference to ipv6 device from parent device.
3268 * Do not dev_put!
3269 */
3270 if (how) {
3271 idev->dead = 1;
3272
3273 /* protected by rtnl_lock */
3274 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3275
3276 /* Step 1.5: remove snmp6 entry */
3277 snmp6_unregister_dev(idev);
3278
3279 }
3280
3281 /* Step 2: clear hash table */
3282 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3283 struct hlist_head *h = &inet6_addr_lst[i];
3284
3285 spin_lock_bh(&addrconf_hash_lock);
3286 restart:
3287 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3288 if (ifa->idev == idev) {
3289 hlist_del_init_rcu(&ifa->addr_lst);
3290 addrconf_del_dad_work(ifa);
3291 goto restart;
3292 }
3293 }
3294 spin_unlock_bh(&addrconf_hash_lock);
3295 }
3296
3297 write_lock_bh(&idev->lock);
3298
3299 addrconf_del_rs_timer(idev);
3300
3301 /* Step 2: clear flags for stateless addrconf */
3302 if (!how)
3303 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3304
3305 if (how && del_timer(&idev->regen_timer))
3306 in6_dev_put(idev);
3307
3308 /* Step 3: clear tempaddr list */
3309 while (!list_empty(&idev->tempaddr_list)) {
3310 ifa = list_first_entry(&idev->tempaddr_list,
3311 struct inet6_ifaddr, tmp_list);
3312 list_del(&ifa->tmp_list);
3313 write_unlock_bh(&idev->lock);
3314 spin_lock_bh(&ifa->lock);
3315
3316 if (ifa->ifpub) {
3317 in6_ifa_put(ifa->ifpub);
3318 ifa->ifpub = NULL;
3319 }
3320 spin_unlock_bh(&ifa->lock);
3321 in6_ifa_put(ifa);
3322 write_lock_bh(&idev->lock);
3323 }
3324
3325 while (!list_empty(&idev->addr_list)) {
3326 ifa = list_first_entry(&idev->addr_list,
3327 struct inet6_ifaddr, if_list);
3328 addrconf_del_dad_work(ifa);
3329
3330 list_del(&ifa->if_list);
3331
3332 write_unlock_bh(&idev->lock);
3333
3334 spin_lock_bh(&ifa->lock);
3335 state = ifa->state;
3336 ifa->state = INET6_IFADDR_STATE_DEAD;
3337 spin_unlock_bh(&ifa->lock);
3338
3339 if (state != INET6_IFADDR_STATE_DEAD) {
3340 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3341 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3342 }
3343 in6_ifa_put(ifa);
3344
3345 write_lock_bh(&idev->lock);
3346 }
3347
3348 write_unlock_bh(&idev->lock);
3349
3350 /* Step 5: Discard anycast and multicast list */
3351 if (how) {
3352 ipv6_ac_destroy_dev(idev);
3353 ipv6_mc_destroy_dev(idev);
3354 } else {
3355 ipv6_mc_down(idev);
3356 }
3357
3358 idev->tstamp = jiffies;
3359
3360 /* Last: Shot the device (if unregistered) */
3361 if (how) {
3362 addrconf_sysctl_unregister(idev);
3363 neigh_parms_release(&nd_tbl, idev->nd_parms);
3364 neigh_ifdown(&nd_tbl, dev);
3365 in6_dev_put(idev);
3366 }
3367 return 0;
3368 }
3369
3370 static void addrconf_rs_timer(unsigned long data)
3371 {
3372 struct inet6_dev *idev = (struct inet6_dev *)data;
3373 struct net_device *dev = idev->dev;
3374 struct in6_addr lladdr;
3375
3376 write_lock(&idev->lock);
3377 if (idev->dead || !(idev->if_flags & IF_READY))
3378 goto out;
3379
3380 if (!ipv6_accept_ra(idev))
3381 goto out;
3382
3383 /* Announcement received after solicitation was sent */
3384 if (idev->if_flags & IF_RA_RCVD)
3385 goto out;
3386
3387 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3388 write_unlock(&idev->lock);
3389 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3390 ndisc_send_rs(dev, &lladdr,
3391 &in6addr_linklocal_allrouters);
3392 else
3393 goto put;
3394
3395 write_lock(&idev->lock);
3396 /* The wait after the last probe can be shorter */
3397 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3398 idev->cnf.rtr_solicits) ?
3399 idev->cnf.rtr_solicit_delay :
3400 idev->cnf.rtr_solicit_interval);
3401 } else {
3402 /*
3403 * Note: we do not support deprecated "all on-link"
3404 * assumption any longer.
3405 */
3406 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3407 }
3408
3409 out:
3410 write_unlock(&idev->lock);
3411 put:
3412 in6_dev_put(idev);
3413 }
3414
3415 /*
3416 * Duplicate Address Detection
3417 */
3418 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3419 {
3420 unsigned long rand_num;
3421 struct inet6_dev *idev = ifp->idev;
3422
3423 if (ifp->flags & IFA_F_OPTIMISTIC)
3424 rand_num = 0;
3425 else
3426 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3427
3428 ifp->dad_probes = idev->cnf.dad_transmits;
3429 addrconf_mod_dad_work(ifp, rand_num);
3430 }
3431
3432 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3433 {
3434 struct inet6_dev *idev = ifp->idev;
3435 struct net_device *dev = idev->dev;
3436
3437 addrconf_join_solict(dev, &ifp->addr);
3438
3439 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3440
3441 read_lock_bh(&idev->lock);
3442 spin_lock(&ifp->lock);
3443 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3444 goto out;
3445
3446 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3447 idev->cnf.accept_dad < 1 ||
3448 !(ifp->flags&IFA_F_TENTATIVE) ||
3449 ifp->flags & IFA_F_NODAD) {
3450 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3451 spin_unlock(&ifp->lock);
3452 read_unlock_bh(&idev->lock);
3453
3454 addrconf_dad_completed(ifp);
3455 return;
3456 }
3457
3458 if (!(idev->if_flags & IF_READY)) {
3459 spin_unlock(&ifp->lock);
3460 read_unlock_bh(&idev->lock);
3461 /*
3462 * If the device is not ready:
3463 * - keep it tentative if it is a permanent address.
3464 * - otherwise, kill it.
3465 */
3466 in6_ifa_hold(ifp);
3467 addrconf_dad_stop(ifp, 0);
3468 return;
3469 }
3470
3471 /*
3472 * Optimistic nodes can start receiving
3473 * Frames right away
3474 */
3475 if (ifp->flags & IFA_F_OPTIMISTIC) {
3476 ip6_ins_rt(ifp->rt);
3477 if (ipv6_use_optimistic_addr(idev)) {
3478 /* Because optimistic nodes can use this address,
3479 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3480 */
3481 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3482 }
3483 }
3484
3485 addrconf_dad_kick(ifp);
3486 out:
3487 spin_unlock(&ifp->lock);
3488 read_unlock_bh(&idev->lock);
3489 }
3490
3491 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3492 {
3493 bool begin_dad = false;
3494
3495 spin_lock_bh(&ifp->lock);
3496 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3497 ifp->state = INET6_IFADDR_STATE_PREDAD;
3498 begin_dad = true;
3499 }
3500 spin_unlock_bh(&ifp->lock);
3501
3502 if (begin_dad)
3503 addrconf_mod_dad_work(ifp, 0);
3504 }
3505
3506 static void addrconf_dad_work(struct work_struct *w)
3507 {
3508 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3509 struct inet6_ifaddr,
3510 dad_work);
3511 struct inet6_dev *idev = ifp->idev;
3512 struct in6_addr mcaddr;
3513
3514 enum {
3515 DAD_PROCESS,
3516 DAD_BEGIN,
3517 DAD_ABORT,
3518 } action = DAD_PROCESS;
3519
3520 rtnl_lock();
3521
3522 spin_lock_bh(&ifp->lock);
3523 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3524 action = DAD_BEGIN;
3525 ifp->state = INET6_IFADDR_STATE_DAD;
3526 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3527 action = DAD_ABORT;
3528 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3529 }
3530 spin_unlock_bh(&ifp->lock);
3531
3532 if (action == DAD_BEGIN) {
3533 addrconf_dad_begin(ifp);
3534 goto out;
3535 } else if (action == DAD_ABORT) {
3536 addrconf_dad_stop(ifp, 1);
3537 goto out;
3538 }
3539
3540 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3541 goto out;
3542
3543 write_lock_bh(&idev->lock);
3544 if (idev->dead || !(idev->if_flags & IF_READY)) {
3545 write_unlock_bh(&idev->lock);
3546 goto out;
3547 }
3548
3549 spin_lock(&ifp->lock);
3550 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3551 spin_unlock(&ifp->lock);
3552 write_unlock_bh(&idev->lock);
3553 goto out;
3554 }
3555
3556 if (ifp->dad_probes == 0) {
3557 /*
3558 * DAD was successful
3559 */
3560
3561 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3562 spin_unlock(&ifp->lock);
3563 write_unlock_bh(&idev->lock);
3564
3565 addrconf_dad_completed(ifp);
3566
3567 goto out;
3568 }
3569
3570 ifp->dad_probes--;
3571 addrconf_mod_dad_work(ifp,
3572 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3573 spin_unlock(&ifp->lock);
3574 write_unlock_bh(&idev->lock);
3575
3576 /* send a neighbour solicitation for our addr */
3577 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3578 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3579 out:
3580 in6_ifa_put(ifp);
3581 rtnl_unlock();
3582 }
3583
3584 /* ifp->idev must be at least read locked */
3585 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3586 {
3587 struct inet6_ifaddr *ifpiter;
3588 struct inet6_dev *idev = ifp->idev;
3589
3590 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3591 if (ifpiter->scope > IFA_LINK)
3592 break;
3593 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3594 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3595 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3596 IFA_F_PERMANENT)
3597 return false;
3598 }
3599 return true;
3600 }
3601
3602 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3603 {
3604 struct net_device *dev = ifp->idev->dev;
3605 struct in6_addr lladdr;
3606 bool send_rs, send_mld;
3607
3608 addrconf_del_dad_work(ifp);
3609
3610 /*
3611 * Configure the address for reception. Now it is valid.
3612 */
3613
3614 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3615
3616 /* If added prefix is link local and we are prepared to process
3617 router advertisements, start sending router solicitations.
3618 */
3619
3620 read_lock_bh(&ifp->idev->lock);
3621 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3622 send_rs = send_mld &&
3623 ipv6_accept_ra(ifp->idev) &&
3624 ifp->idev->cnf.rtr_solicits > 0 &&
3625 (dev->flags&IFF_LOOPBACK) == 0;
3626 read_unlock_bh(&ifp->idev->lock);
3627
3628 /* While dad is in progress mld report's source address is in6_addrany.
3629 * Resend with proper ll now.
3630 */
3631 if (send_mld)
3632 ipv6_mc_dad_complete(ifp->idev);
3633
3634 if (send_rs) {
3635 /*
3636 * If a host as already performed a random delay
3637 * [...] as part of DAD [...] there is no need
3638 * to delay again before sending the first RS
3639 */
3640 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3641 return;
3642 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3643
3644 write_lock_bh(&ifp->idev->lock);
3645 spin_lock(&ifp->lock);
3646 ifp->idev->rs_probes = 1;
3647 ifp->idev->if_flags |= IF_RS_SENT;
3648 addrconf_mod_rs_timer(ifp->idev,
3649 ifp->idev->cnf.rtr_solicit_interval);
3650 spin_unlock(&ifp->lock);
3651 write_unlock_bh(&ifp->idev->lock);
3652 }
3653 }
3654
3655 static void addrconf_dad_run(struct inet6_dev *idev)
3656 {
3657 struct inet6_ifaddr *ifp;
3658
3659 read_lock_bh(&idev->lock);
3660 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3661 spin_lock(&ifp->lock);
3662 if (ifp->flags & IFA_F_TENTATIVE &&
3663 ifp->state == INET6_IFADDR_STATE_DAD)
3664 addrconf_dad_kick(ifp);
3665 spin_unlock(&ifp->lock);
3666 }
3667 read_unlock_bh(&idev->lock);
3668 }
3669
3670 #ifdef CONFIG_PROC_FS
3671 struct if6_iter_state {
3672 struct seq_net_private p;
3673 int bucket;
3674 int offset;
3675 };
3676
3677 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3678 {
3679 struct inet6_ifaddr *ifa = NULL;
3680 struct if6_iter_state *state = seq->private;
3681 struct net *net = seq_file_net(seq);
3682 int p = 0;
3683
3684 /* initial bucket if pos is 0 */
3685 if (pos == 0) {
3686 state->bucket = 0;
3687 state->offset = 0;
3688 }
3689
3690 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3691 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3692 addr_lst) {
3693 if (!net_eq(dev_net(ifa->idev->dev), net))
3694 continue;
3695 /* sync with offset */
3696 if (p < state->offset) {
3697 p++;
3698 continue;
3699 }
3700 state->offset++;
3701 return ifa;
3702 }
3703
3704 /* prepare for next bucket */
3705 state->offset = 0;
3706 p = 0;
3707 }
3708 return NULL;
3709 }
3710
3711 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3712 struct inet6_ifaddr *ifa)
3713 {
3714 struct if6_iter_state *state = seq->private;
3715 struct net *net = seq_file_net(seq);
3716
3717 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3718 if (!net_eq(dev_net(ifa->idev->dev), net))
3719 continue;
3720 state->offset++;
3721 return ifa;
3722 }
3723
3724 while (++state->bucket < IN6_ADDR_HSIZE) {
3725 state->offset = 0;
3726 hlist_for_each_entry_rcu_bh(ifa,
3727 &inet6_addr_lst[state->bucket], addr_lst) {
3728 if (!net_eq(dev_net(ifa->idev->dev), net))
3729 continue;
3730 state->offset++;
3731 return ifa;
3732 }
3733 }
3734
3735 return NULL;
3736 }
3737
3738 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3739 __acquires(rcu_bh)
3740 {
3741 rcu_read_lock_bh();
3742 return if6_get_first(seq, *pos);
3743 }
3744
3745 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3746 {
3747 struct inet6_ifaddr *ifa;
3748
3749 ifa = if6_get_next(seq, v);
3750 ++*pos;
3751 return ifa;
3752 }
3753
3754 static void if6_seq_stop(struct seq_file *seq, void *v)
3755 __releases(rcu_bh)
3756 {
3757 rcu_read_unlock_bh();
3758 }
3759
3760 static int if6_seq_show(struct seq_file *seq, void *v)
3761 {
3762 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3763 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3764 &ifp->addr,
3765 ifp->idev->dev->ifindex,
3766 ifp->prefix_len,
3767 ifp->scope,
3768 (u8) ifp->flags,
3769 ifp->idev->dev->name);
3770 return 0;
3771 }
3772
3773 static const struct seq_operations if6_seq_ops = {
3774 .start = if6_seq_start,
3775 .next = if6_seq_next,
3776 .show = if6_seq_show,
3777 .stop = if6_seq_stop,
3778 };
3779
3780 static int if6_seq_open(struct inode *inode, struct file *file)
3781 {
3782 return seq_open_net(inode, file, &if6_seq_ops,
3783 sizeof(struct if6_iter_state));
3784 }
3785
3786 static const struct file_operations if6_fops = {
3787 .owner = THIS_MODULE,
3788 .open = if6_seq_open,
3789 .read = seq_read,
3790 .llseek = seq_lseek,
3791 .release = seq_release_net,
3792 };
3793
3794 static int __net_init if6_proc_net_init(struct net *net)
3795 {
3796 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3797 return -ENOMEM;
3798 return 0;
3799 }
3800
3801 static void __net_exit if6_proc_net_exit(struct net *net)
3802 {
3803 remove_proc_entry("if_inet6", net->proc_net);
3804 }
3805
3806 static struct pernet_operations if6_proc_net_ops = {
3807 .init = if6_proc_net_init,
3808 .exit = if6_proc_net_exit,
3809 };
3810
3811 int __init if6_proc_init(void)
3812 {
3813 return register_pernet_subsys(&if6_proc_net_ops);
3814 }
3815
3816 void if6_proc_exit(void)
3817 {
3818 unregister_pernet_subsys(&if6_proc_net_ops);
3819 }
3820 #endif /* CONFIG_PROC_FS */
3821
3822 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3823 /* Check if address is a home address configured on any interface. */
3824 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3825 {
3826 int ret = 0;
3827 struct inet6_ifaddr *ifp = NULL;
3828 unsigned int hash = inet6_addr_hash(addr);
3829
3830 rcu_read_lock_bh();
3831 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3832 if (!net_eq(dev_net(ifp->idev->dev), net))
3833 continue;
3834 if (ipv6_addr_equal(&ifp->addr, addr) &&
3835 (ifp->flags & IFA_F_HOMEADDRESS)) {
3836 ret = 1;
3837 break;
3838 }
3839 }
3840 rcu_read_unlock_bh();
3841 return ret;
3842 }
3843 #endif
3844
3845 /*
3846 * Periodic address status verification
3847 */
3848
3849 static void addrconf_verify_rtnl(void)
3850 {
3851 unsigned long now, next, next_sec, next_sched;
3852 struct inet6_ifaddr *ifp;
3853 int i;
3854
3855 ASSERT_RTNL();
3856
3857 rcu_read_lock_bh();
3858 now = jiffies;
3859 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3860
3861 cancel_delayed_work(&addr_chk_work);
3862
3863 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3864 restart:
3865 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3866 unsigned long age;
3867
3868 /* When setting preferred_lft to a value not zero or
3869 * infinity, while valid_lft is infinity
3870 * IFA_F_PERMANENT has a non-infinity life time.
3871 */
3872 if ((ifp->flags & IFA_F_PERMANENT) &&
3873 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3874 continue;
3875
3876 spin_lock(&ifp->lock);
3877 /* We try to batch several events at once. */
3878 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3879
3880 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3881 age >= ifp->valid_lft) {
3882 spin_unlock(&ifp->lock);
3883 in6_ifa_hold(ifp);
3884 ipv6_del_addr(ifp);
3885 goto restart;
3886 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3887 spin_unlock(&ifp->lock);
3888 continue;
3889 } else if (age >= ifp->prefered_lft) {
3890 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3891 int deprecate = 0;
3892
3893 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3894 deprecate = 1;
3895 ifp->flags |= IFA_F_DEPRECATED;
3896 }
3897
3898 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3899 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3900 next = ifp->tstamp + ifp->valid_lft * HZ;
3901
3902 spin_unlock(&ifp->lock);
3903
3904 if (deprecate) {
3905 in6_ifa_hold(ifp);
3906
3907 ipv6_ifa_notify(0, ifp);
3908 in6_ifa_put(ifp);
3909 goto restart;
3910 }
3911 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3912 !(ifp->flags&IFA_F_TENTATIVE)) {
3913 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3914 ifp->idev->cnf.dad_transmits *
3915 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3916
3917 if (age >= ifp->prefered_lft - regen_advance) {
3918 struct inet6_ifaddr *ifpub = ifp->ifpub;
3919 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3920 next = ifp->tstamp + ifp->prefered_lft * HZ;
3921 if (!ifp->regen_count && ifpub) {
3922 ifp->regen_count++;
3923 in6_ifa_hold(ifp);
3924 in6_ifa_hold(ifpub);
3925 spin_unlock(&ifp->lock);
3926
3927 spin_lock(&ifpub->lock);
3928 ifpub->regen_count = 0;
3929 spin_unlock(&ifpub->lock);
3930 ipv6_create_tempaddr(ifpub, ifp);
3931 in6_ifa_put(ifpub);
3932 in6_ifa_put(ifp);
3933 goto restart;
3934 }
3935 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3936 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3937 spin_unlock(&ifp->lock);
3938 } else {
3939 /* ifp->prefered_lft <= ifp->valid_lft */
3940 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3941 next = ifp->tstamp + ifp->prefered_lft * HZ;
3942 spin_unlock(&ifp->lock);
3943 }
3944 }
3945 }
3946
3947 next_sec = round_jiffies_up(next);
3948 next_sched = next;
3949
3950 /* If rounded timeout is accurate enough, accept it. */
3951 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3952 next_sched = next_sec;
3953
3954 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3955 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3956 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3957
3958 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3959 now, next, next_sec, next_sched);
3960 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
3961 rcu_read_unlock_bh();
3962 }
3963
3964 static void addrconf_verify_work(struct work_struct *w)
3965 {
3966 rtnl_lock();
3967 addrconf_verify_rtnl();
3968 rtnl_unlock();
3969 }
3970
3971 static void addrconf_verify(void)
3972 {
3973 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3974 }
3975
3976 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3977 struct in6_addr **peer_pfx)
3978 {
3979 struct in6_addr *pfx = NULL;
3980
3981 *peer_pfx = NULL;
3982
3983 if (addr)
3984 pfx = nla_data(addr);
3985
3986 if (local) {
3987 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3988 *peer_pfx = pfx;
3989 pfx = nla_data(local);
3990 }
3991
3992 return pfx;
3993 }
3994
3995 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3996 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3997 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3998 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3999 [IFA_FLAGS] = { .len = sizeof(u32) },
4000 };
4001
4002 static int
4003 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4004 {
4005 struct net *net = sock_net(skb->sk);
4006 struct ifaddrmsg *ifm;
4007 struct nlattr *tb[IFA_MAX+1];
4008 struct in6_addr *pfx, *peer_pfx;
4009 u32 ifa_flags;
4010 int err;
4011
4012 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4013 if (err < 0)
4014 return err;
4015
4016 ifm = nlmsg_data(nlh);
4017 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4018 if (!pfx)
4019 return -EINVAL;
4020
4021 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4022
4023 /* We ignore other flags so far. */
4024 ifa_flags &= IFA_F_MANAGETEMPADDR;
4025
4026 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4027 ifm->ifa_prefixlen);
4028 }
4029
4030 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4031 u32 prefered_lft, u32 valid_lft)
4032 {
4033 u32 flags;
4034 clock_t expires;
4035 unsigned long timeout;
4036 bool was_managetempaddr;
4037 bool had_prefixroute;
4038
4039 ASSERT_RTNL();
4040
4041 if (!valid_lft || (prefered_lft > valid_lft))
4042 return -EINVAL;
4043
4044 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4045 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4046 return -EINVAL;
4047
4048 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4049 if (addrconf_finite_timeout(timeout)) {
4050 expires = jiffies_to_clock_t(timeout * HZ);
4051 valid_lft = timeout;
4052 flags = RTF_EXPIRES;
4053 } else {
4054 expires = 0;
4055 flags = 0;
4056 ifa_flags |= IFA_F_PERMANENT;
4057 }
4058
4059 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4060 if (addrconf_finite_timeout(timeout)) {
4061 if (timeout == 0)
4062 ifa_flags |= IFA_F_DEPRECATED;
4063 prefered_lft = timeout;
4064 }
4065
4066 spin_lock_bh(&ifp->lock);
4067 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4068 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4069 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4070 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4071 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4072 IFA_F_NOPREFIXROUTE);
4073 ifp->flags |= ifa_flags;
4074 ifp->tstamp = jiffies;
4075 ifp->valid_lft = valid_lft;
4076 ifp->prefered_lft = prefered_lft;
4077
4078 spin_unlock_bh(&ifp->lock);
4079 if (!(ifp->flags&IFA_F_TENTATIVE))
4080 ipv6_ifa_notify(0, ifp);
4081
4082 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4083 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4084 expires, flags);
4085 } else if (had_prefixroute) {
4086 enum cleanup_prefix_rt_t action;
4087 unsigned long rt_expires;
4088
4089 write_lock_bh(&ifp->idev->lock);
4090 action = check_cleanup_prefix_route(ifp, &rt_expires);
4091 write_unlock_bh(&ifp->idev->lock);
4092
4093 if (action != CLEANUP_PREFIX_RT_NOP) {
4094 cleanup_prefix_route(ifp, rt_expires,
4095 action == CLEANUP_PREFIX_RT_DEL);
4096 }
4097 }
4098
4099 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4100 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4101 valid_lft = prefered_lft = 0;
4102 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4103 !was_managetempaddr, jiffies);
4104 }
4105
4106 addrconf_verify_rtnl();
4107
4108 return 0;
4109 }
4110
4111 static int
4112 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4113 {
4114 struct net *net = sock_net(skb->sk);
4115 struct ifaddrmsg *ifm;
4116 struct nlattr *tb[IFA_MAX+1];
4117 struct in6_addr *pfx, *peer_pfx;
4118 struct inet6_ifaddr *ifa;
4119 struct net_device *dev;
4120 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4121 u32 ifa_flags;
4122 int err;
4123
4124 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4125 if (err < 0)
4126 return err;
4127
4128 ifm = nlmsg_data(nlh);
4129 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4130 if (!pfx)
4131 return -EINVAL;
4132
4133 if (tb[IFA_CACHEINFO]) {
4134 struct ifa_cacheinfo *ci;
4135
4136 ci = nla_data(tb[IFA_CACHEINFO]);
4137 valid_lft = ci->ifa_valid;
4138 preferred_lft = ci->ifa_prefered;
4139 } else {
4140 preferred_lft = INFINITY_LIFE_TIME;
4141 valid_lft = INFINITY_LIFE_TIME;
4142 }
4143
4144 dev = __dev_get_by_index(net, ifm->ifa_index);
4145 if (!dev)
4146 return -ENODEV;
4147
4148 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4149
4150 /* We ignore other flags so far. */
4151 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4152 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4153
4154 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4155 if (!ifa) {
4156 /*
4157 * It would be best to check for !NLM_F_CREATE here but
4158 * userspace already relies on not having to provide this.
4159 */
4160 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4161 ifm->ifa_prefixlen, ifa_flags,
4162 preferred_lft, valid_lft);
4163 }
4164
4165 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4166 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4167 err = -EEXIST;
4168 else
4169 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4170
4171 in6_ifa_put(ifa);
4172
4173 return err;
4174 }
4175
4176 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4177 u8 scope, int ifindex)
4178 {
4179 struct ifaddrmsg *ifm;
4180
4181 ifm = nlmsg_data(nlh);
4182 ifm->ifa_family = AF_INET6;
4183 ifm->ifa_prefixlen = prefixlen;
4184 ifm->ifa_flags = flags;
4185 ifm->ifa_scope = scope;
4186 ifm->ifa_index = ifindex;
4187 }
4188
4189 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4190 unsigned long tstamp, u32 preferred, u32 valid)
4191 {
4192 struct ifa_cacheinfo ci;
4193
4194 ci.cstamp = cstamp_delta(cstamp);
4195 ci.tstamp = cstamp_delta(tstamp);
4196 ci.ifa_prefered = preferred;
4197 ci.ifa_valid = valid;
4198
4199 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4200 }
4201
4202 static inline int rt_scope(int ifa_scope)
4203 {
4204 if (ifa_scope & IFA_HOST)
4205 return RT_SCOPE_HOST;
4206 else if (ifa_scope & IFA_LINK)
4207 return RT_SCOPE_LINK;
4208 else if (ifa_scope & IFA_SITE)
4209 return RT_SCOPE_SITE;
4210 else
4211 return RT_SCOPE_UNIVERSE;
4212 }
4213
4214 static inline int inet6_ifaddr_msgsize(void)
4215 {
4216 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4217 + nla_total_size(16) /* IFA_LOCAL */
4218 + nla_total_size(16) /* IFA_ADDRESS */
4219 + nla_total_size(sizeof(struct ifa_cacheinfo))
4220 + nla_total_size(4) /* IFA_FLAGS */;
4221 }
4222
4223 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4224 u32 portid, u32 seq, int event, unsigned int flags)
4225 {
4226 struct nlmsghdr *nlh;
4227 u32 preferred, valid;
4228
4229 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4230 if (!nlh)
4231 return -EMSGSIZE;
4232
4233 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4234 ifa->idev->dev->ifindex);
4235
4236 if (!((ifa->flags&IFA_F_PERMANENT) &&
4237 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4238 preferred = ifa->prefered_lft;
4239 valid = ifa->valid_lft;
4240 if (preferred != INFINITY_LIFE_TIME) {
4241 long tval = (jiffies - ifa->tstamp)/HZ;
4242 if (preferred > tval)
4243 preferred -= tval;
4244 else
4245 preferred = 0;
4246 if (valid != INFINITY_LIFE_TIME) {
4247 if (valid > tval)
4248 valid -= tval;
4249 else
4250 valid = 0;
4251 }
4252 }
4253 } else {
4254 preferred = INFINITY_LIFE_TIME;
4255 valid = INFINITY_LIFE_TIME;
4256 }
4257
4258 if (!ipv6_addr_any(&ifa->peer_addr)) {
4259 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4260 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4261 goto error;
4262 } else
4263 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4264 goto error;
4265
4266 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4267 goto error;
4268
4269 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4270 goto error;
4271
4272 nlmsg_end(skb, nlh);
4273 return 0;
4274
4275 error:
4276 nlmsg_cancel(skb, nlh);
4277 return -EMSGSIZE;
4278 }
4279
4280 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4281 u32 portid, u32 seq, int event, u16 flags)
4282 {
4283 struct nlmsghdr *nlh;
4284 u8 scope = RT_SCOPE_UNIVERSE;
4285 int ifindex = ifmca->idev->dev->ifindex;
4286
4287 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4288 scope = RT_SCOPE_SITE;
4289
4290 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4291 if (!nlh)
4292 return -EMSGSIZE;
4293
4294 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4295 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4296 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4297 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4298 nlmsg_cancel(skb, nlh);
4299 return -EMSGSIZE;
4300 }
4301
4302 nlmsg_end(skb, nlh);
4303 return 0;
4304 }
4305
4306 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4307 u32 portid, u32 seq, int event, unsigned int flags)
4308 {
4309 struct nlmsghdr *nlh;
4310 u8 scope = RT_SCOPE_UNIVERSE;
4311 int ifindex = ifaca->aca_idev->dev->ifindex;
4312
4313 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4314 scope = RT_SCOPE_SITE;
4315
4316 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4317 if (!nlh)
4318 return -EMSGSIZE;
4319
4320 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4321 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4322 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4323 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4324 nlmsg_cancel(skb, nlh);
4325 return -EMSGSIZE;
4326 }
4327
4328 nlmsg_end(skb, nlh);
4329 return 0;
4330 }
4331
4332 enum addr_type_t {
4333 UNICAST_ADDR,
4334 MULTICAST_ADDR,
4335 ANYCAST_ADDR,
4336 };
4337
4338 /* called with rcu_read_lock() */
4339 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4340 struct netlink_callback *cb, enum addr_type_t type,
4341 int s_ip_idx, int *p_ip_idx)
4342 {
4343 struct ifmcaddr6 *ifmca;
4344 struct ifacaddr6 *ifaca;
4345 int err = 1;
4346 int ip_idx = *p_ip_idx;
4347
4348 read_lock_bh(&idev->lock);
4349 switch (type) {
4350 case UNICAST_ADDR: {
4351 struct inet6_ifaddr *ifa;
4352
4353 /* unicast address incl. temp addr */
4354 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4355 if (++ip_idx < s_ip_idx)
4356 continue;
4357 err = inet6_fill_ifaddr(skb, ifa,
4358 NETLINK_CB(cb->skb).portid,
4359 cb->nlh->nlmsg_seq,
4360 RTM_NEWADDR,
4361 NLM_F_MULTI);
4362 if (err < 0)
4363 break;
4364 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4365 }
4366 break;
4367 }
4368 case MULTICAST_ADDR:
4369 /* multicast address */
4370 for (ifmca = idev->mc_list; ifmca;
4371 ifmca = ifmca->next, ip_idx++) {
4372 if (ip_idx < s_ip_idx)
4373 continue;
4374 err = inet6_fill_ifmcaddr(skb, ifmca,
4375 NETLINK_CB(cb->skb).portid,
4376 cb->nlh->nlmsg_seq,
4377 RTM_GETMULTICAST,
4378 NLM_F_MULTI);
4379 if (err < 0)
4380 break;
4381 }
4382 break;
4383 case ANYCAST_ADDR:
4384 /* anycast address */
4385 for (ifaca = idev->ac_list; ifaca;
4386 ifaca = ifaca->aca_next, ip_idx++) {
4387 if (ip_idx < s_ip_idx)
4388 continue;
4389 err = inet6_fill_ifacaddr(skb, ifaca,
4390 NETLINK_CB(cb->skb).portid,
4391 cb->nlh->nlmsg_seq,
4392 RTM_GETANYCAST,
4393 NLM_F_MULTI);
4394 if (err < 0)
4395 break;
4396 }
4397 break;
4398 default:
4399 break;
4400 }
4401 read_unlock_bh(&idev->lock);
4402 *p_ip_idx = ip_idx;
4403 return err;
4404 }
4405
4406 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4407 enum addr_type_t type)
4408 {
4409 struct net *net = sock_net(skb->sk);
4410 int h, s_h;
4411 int idx, ip_idx;
4412 int s_idx, s_ip_idx;
4413 struct net_device *dev;
4414 struct inet6_dev *idev;
4415 struct hlist_head *head;
4416
4417 s_h = cb->args[0];
4418 s_idx = idx = cb->args[1];
4419 s_ip_idx = ip_idx = cb->args[2];
4420
4421 rcu_read_lock();
4422 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4423 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4424 idx = 0;
4425 head = &net->dev_index_head[h];
4426 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4427 if (idx < s_idx)
4428 goto cont;
4429 if (h > s_h || idx > s_idx)
4430 s_ip_idx = 0;
4431 ip_idx = 0;
4432 idev = __in6_dev_get(dev);
4433 if (!idev)
4434 goto cont;
4435
4436 if (in6_dump_addrs(idev, skb, cb, type,
4437 s_ip_idx, &ip_idx) < 0)
4438 goto done;
4439 cont:
4440 idx++;
4441 }
4442 }
4443 done:
4444 rcu_read_unlock();
4445 cb->args[0] = h;
4446 cb->args[1] = idx;
4447 cb->args[2] = ip_idx;
4448
4449 return skb->len;
4450 }
4451
4452 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4453 {
4454 enum addr_type_t type = UNICAST_ADDR;
4455
4456 return inet6_dump_addr(skb, cb, type);
4457 }
4458
4459 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4460 {
4461 enum addr_type_t type = MULTICAST_ADDR;
4462
4463 return inet6_dump_addr(skb, cb, type);
4464 }
4465
4466
4467 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4468 {
4469 enum addr_type_t type = ANYCAST_ADDR;
4470
4471 return inet6_dump_addr(skb, cb, type);
4472 }
4473
4474 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4475 {
4476 struct net *net = sock_net(in_skb->sk);
4477 struct ifaddrmsg *ifm;
4478 struct nlattr *tb[IFA_MAX+1];
4479 struct in6_addr *addr = NULL, *peer;
4480 struct net_device *dev = NULL;
4481 struct inet6_ifaddr *ifa;
4482 struct sk_buff *skb;
4483 int err;
4484
4485 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4486 if (err < 0)
4487 goto errout;
4488
4489 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4490 if (!addr) {
4491 err = -EINVAL;
4492 goto errout;
4493 }
4494
4495 ifm = nlmsg_data(nlh);
4496 if (ifm->ifa_index)
4497 dev = __dev_get_by_index(net, ifm->ifa_index);
4498
4499 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4500 if (!ifa) {
4501 err = -EADDRNOTAVAIL;
4502 goto errout;
4503 }
4504
4505 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4506 if (!skb) {
4507 err = -ENOBUFS;
4508 goto errout_ifa;
4509 }
4510
4511 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4512 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4513 if (err < 0) {
4514 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4515 WARN_ON(err == -EMSGSIZE);
4516 kfree_skb(skb);
4517 goto errout_ifa;
4518 }
4519 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4520 errout_ifa:
4521 in6_ifa_put(ifa);
4522 errout:
4523 return err;
4524 }
4525
4526 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4527 {
4528 struct sk_buff *skb;
4529 struct net *net = dev_net(ifa->idev->dev);
4530 int err = -ENOBUFS;
4531
4532 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4533 if (!skb)
4534 goto errout;
4535
4536 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4537 if (err < 0) {
4538 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4539 WARN_ON(err == -EMSGSIZE);
4540 kfree_skb(skb);
4541 goto errout;
4542 }
4543 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4544 return;
4545 errout:
4546 if (err < 0)
4547 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4548 }
4549
4550 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4551 __s32 *array, int bytes)
4552 {
4553 BUG_ON(bytes < (DEVCONF_MAX * 4));
4554
4555 memset(array, 0, bytes);
4556 array[DEVCONF_FORWARDING] = cnf->forwarding;
4557 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4558 array[DEVCONF_MTU6] = cnf->mtu6;
4559 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4560 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4561 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4562 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4563 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4564 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4565 jiffies_to_msecs(cnf->rtr_solicit_interval);
4566 array[DEVCONF_RTR_SOLICIT_DELAY] =
4567 jiffies_to_msecs(cnf->rtr_solicit_delay);
4568 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4569 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4570 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4571 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4572 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4573 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4574 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4575 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4576 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4577 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4578 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4579 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4580 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4581 #ifdef CONFIG_IPV6_ROUTER_PREF
4582 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4583 array[DEVCONF_RTR_PROBE_INTERVAL] =
4584 jiffies_to_msecs(cnf->rtr_probe_interval);
4585 #ifdef CONFIG_IPV6_ROUTE_INFO
4586 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4587 #endif
4588 #endif
4589 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4590 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4591 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4592 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4593 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4594 #endif
4595 #ifdef CONFIG_IPV6_MROUTE
4596 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4597 #endif
4598 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4599 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4600 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4601 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4602 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4603 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4604 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4605 /* we omit DEVCONF_STABLE_SECRET for now */
4606 }
4607
4608 static inline size_t inet6_ifla6_size(void)
4609 {
4610 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4611 + nla_total_size(sizeof(struct ifla_cacheinfo))
4612 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4613 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4614 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4615 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4616 }
4617
4618 static inline size_t inet6_if_nlmsg_size(void)
4619 {
4620 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4621 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4622 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4623 + nla_total_size(4) /* IFLA_MTU */
4624 + nla_total_size(4) /* IFLA_LINK */
4625 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4626 }
4627
4628 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4629 int items, int bytes)
4630 {
4631 int i;
4632 int pad = bytes - sizeof(u64) * items;
4633 BUG_ON(pad < 0);
4634
4635 /* Use put_unaligned() because stats may not be aligned for u64. */
4636 put_unaligned(items, &stats[0]);
4637 for (i = 1; i < items; i++)
4638 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4639
4640 memset(&stats[items], 0, pad);
4641 }
4642
4643 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4644 int items, int bytes, size_t syncpoff)
4645 {
4646 int i;
4647 int pad = bytes - sizeof(u64) * items;
4648 BUG_ON(pad < 0);
4649
4650 /* Use put_unaligned() because stats may not be aligned for u64. */
4651 put_unaligned(items, &stats[0]);
4652 for (i = 1; i < items; i++)
4653 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4654
4655 memset(&stats[items], 0, pad);
4656 }
4657
4658 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4659 int bytes)
4660 {
4661 switch (attrtype) {
4662 case IFLA_INET6_STATS:
4663 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4664 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4665 break;
4666 case IFLA_INET6_ICMP6STATS:
4667 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4668 break;
4669 }
4670 }
4671
4672 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4673 {
4674 struct nlattr *nla;
4675 struct ifla_cacheinfo ci;
4676
4677 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4678 goto nla_put_failure;
4679 ci.max_reasm_len = IPV6_MAXPLEN;
4680 ci.tstamp = cstamp_delta(idev->tstamp);
4681 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4682 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4683 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4684 goto nla_put_failure;
4685 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4686 if (!nla)
4687 goto nla_put_failure;
4688 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4689
4690 /* XXX - MC not implemented */
4691
4692 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4693 if (!nla)
4694 goto nla_put_failure;
4695 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4696
4697 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4698 if (!nla)
4699 goto nla_put_failure;
4700 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4701
4702 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4703 if (!nla)
4704 goto nla_put_failure;
4705
4706 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4707 goto nla_put_failure;
4708
4709 read_lock_bh(&idev->lock);
4710 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4711 read_unlock_bh(&idev->lock);
4712
4713 return 0;
4714
4715 nla_put_failure:
4716 return -EMSGSIZE;
4717 }
4718
4719 static size_t inet6_get_link_af_size(const struct net_device *dev)
4720 {
4721 if (!__in6_dev_get(dev))
4722 return 0;
4723
4724 return inet6_ifla6_size();
4725 }
4726
4727 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4728 {
4729 struct inet6_dev *idev = __in6_dev_get(dev);
4730
4731 if (!idev)
4732 return -ENODATA;
4733
4734 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4735 return -EMSGSIZE;
4736
4737 return 0;
4738 }
4739
4740 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4741 {
4742 struct inet6_ifaddr *ifp;
4743 struct net_device *dev = idev->dev;
4744 bool update_rs = false;
4745 struct in6_addr ll_addr;
4746
4747 ASSERT_RTNL();
4748
4749 if (!token)
4750 return -EINVAL;
4751 if (ipv6_addr_any(token))
4752 return -EINVAL;
4753 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4754 return -EINVAL;
4755 if (!ipv6_accept_ra(idev))
4756 return -EINVAL;
4757 if (idev->cnf.rtr_solicits <= 0)
4758 return -EINVAL;
4759
4760 write_lock_bh(&idev->lock);
4761
4762 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4763 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4764
4765 write_unlock_bh(&idev->lock);
4766
4767 if (!idev->dead && (idev->if_flags & IF_READY) &&
4768 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4769 IFA_F_OPTIMISTIC)) {
4770
4771 /* If we're not ready, then normal ifup will take care
4772 * of this. Otherwise, we need to request our rs here.
4773 */
4774 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4775 update_rs = true;
4776 }
4777
4778 write_lock_bh(&idev->lock);
4779
4780 if (update_rs) {
4781 idev->if_flags |= IF_RS_SENT;
4782 idev->rs_probes = 1;
4783 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4784 }
4785
4786 /* Well, that's kinda nasty ... */
4787 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4788 spin_lock(&ifp->lock);
4789 if (ifp->tokenized) {
4790 ifp->valid_lft = 0;
4791 ifp->prefered_lft = 0;
4792 }
4793 spin_unlock(&ifp->lock);
4794 }
4795
4796 write_unlock_bh(&idev->lock);
4797 inet6_ifinfo_notify(RTM_NEWLINK, idev);
4798 addrconf_verify_rtnl();
4799 return 0;
4800 }
4801
4802 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4803 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4804 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4805 };
4806
4807 static int inet6_validate_link_af(const struct net_device *dev,
4808 const struct nlattr *nla)
4809 {
4810 struct nlattr *tb[IFLA_INET6_MAX + 1];
4811
4812 if (dev && !__in6_dev_get(dev))
4813 return -EAFNOSUPPORT;
4814
4815 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4816 }
4817
4818 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4819 {
4820 int err = -EINVAL;
4821 struct inet6_dev *idev = __in6_dev_get(dev);
4822 struct nlattr *tb[IFLA_INET6_MAX + 1];
4823
4824 if (!idev)
4825 return -EAFNOSUPPORT;
4826
4827 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4828 BUG();
4829
4830 if (tb[IFLA_INET6_TOKEN]) {
4831 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4832 if (err)
4833 return err;
4834 }
4835
4836 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4837 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4838
4839 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4840 mode != IN6_ADDR_GEN_MODE_NONE &&
4841 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4842 return -EINVAL;
4843
4844 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4845 !idev->cnf.stable_secret.initialized &&
4846 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4847 return -EINVAL;
4848
4849 idev->addr_gen_mode = mode;
4850 err = 0;
4851 }
4852
4853 return err;
4854 }
4855
4856 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4857 u32 portid, u32 seq, int event, unsigned int flags)
4858 {
4859 struct net_device *dev = idev->dev;
4860 struct ifinfomsg *hdr;
4861 struct nlmsghdr *nlh;
4862 void *protoinfo;
4863
4864 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4865 if (!nlh)
4866 return -EMSGSIZE;
4867
4868 hdr = nlmsg_data(nlh);
4869 hdr->ifi_family = AF_INET6;
4870 hdr->__ifi_pad = 0;
4871 hdr->ifi_type = dev->type;
4872 hdr->ifi_index = dev->ifindex;
4873 hdr->ifi_flags = dev_get_flags(dev);
4874 hdr->ifi_change = 0;
4875
4876 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4877 (dev->addr_len &&
4878 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4879 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4880 (dev->ifindex != dev_get_iflink(dev) &&
4881 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
4882 goto nla_put_failure;
4883 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4884 if (!protoinfo)
4885 goto nla_put_failure;
4886
4887 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4888 goto nla_put_failure;
4889
4890 nla_nest_end(skb, protoinfo);
4891 nlmsg_end(skb, nlh);
4892 return 0;
4893
4894 nla_put_failure:
4895 nlmsg_cancel(skb, nlh);
4896 return -EMSGSIZE;
4897 }
4898
4899 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4900 {
4901 struct net *net = sock_net(skb->sk);
4902 int h, s_h;
4903 int idx = 0, s_idx;
4904 struct net_device *dev;
4905 struct inet6_dev *idev;
4906 struct hlist_head *head;
4907
4908 s_h = cb->args[0];
4909 s_idx = cb->args[1];
4910
4911 rcu_read_lock();
4912 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4913 idx = 0;
4914 head = &net->dev_index_head[h];
4915 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4916 if (idx < s_idx)
4917 goto cont;
4918 idev = __in6_dev_get(dev);
4919 if (!idev)
4920 goto cont;
4921 if (inet6_fill_ifinfo(skb, idev,
4922 NETLINK_CB(cb->skb).portid,
4923 cb->nlh->nlmsg_seq,
4924 RTM_NEWLINK, NLM_F_MULTI) < 0)
4925 goto out;
4926 cont:
4927 idx++;
4928 }
4929 }
4930 out:
4931 rcu_read_unlock();
4932 cb->args[1] = idx;
4933 cb->args[0] = h;
4934
4935 return skb->len;
4936 }
4937
4938 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4939 {
4940 struct sk_buff *skb;
4941 struct net *net = dev_net(idev->dev);
4942 int err = -ENOBUFS;
4943
4944 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4945 if (!skb)
4946 goto errout;
4947
4948 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4949 if (err < 0) {
4950 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4951 WARN_ON(err == -EMSGSIZE);
4952 kfree_skb(skb);
4953 goto errout;
4954 }
4955 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4956 return;
4957 errout:
4958 if (err < 0)
4959 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4960 }
4961
4962 static inline size_t inet6_prefix_nlmsg_size(void)
4963 {
4964 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4965 + nla_total_size(sizeof(struct in6_addr))
4966 + nla_total_size(sizeof(struct prefix_cacheinfo));
4967 }
4968
4969 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4970 struct prefix_info *pinfo, u32 portid, u32 seq,
4971 int event, unsigned int flags)
4972 {
4973 struct prefixmsg *pmsg;
4974 struct nlmsghdr *nlh;
4975 struct prefix_cacheinfo ci;
4976
4977 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4978 if (!nlh)
4979 return -EMSGSIZE;
4980
4981 pmsg = nlmsg_data(nlh);
4982 pmsg->prefix_family = AF_INET6;
4983 pmsg->prefix_pad1 = 0;
4984 pmsg->prefix_pad2 = 0;
4985 pmsg->prefix_ifindex = idev->dev->ifindex;
4986 pmsg->prefix_len = pinfo->prefix_len;
4987 pmsg->prefix_type = pinfo->type;
4988 pmsg->prefix_pad3 = 0;
4989 pmsg->prefix_flags = 0;
4990 if (pinfo->onlink)
4991 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4992 if (pinfo->autoconf)
4993 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4994
4995 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4996 goto nla_put_failure;
4997 ci.preferred_time = ntohl(pinfo->prefered);
4998 ci.valid_time = ntohl(pinfo->valid);
4999 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5000 goto nla_put_failure;
5001 nlmsg_end(skb, nlh);
5002 return 0;
5003
5004 nla_put_failure:
5005 nlmsg_cancel(skb, nlh);
5006 return -EMSGSIZE;
5007 }
5008
5009 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5010 struct prefix_info *pinfo)
5011 {
5012 struct sk_buff *skb;
5013 struct net *net = dev_net(idev->dev);
5014 int err = -ENOBUFS;
5015
5016 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5017 if (!skb)
5018 goto errout;
5019
5020 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5021 if (err < 0) {
5022 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5023 WARN_ON(err == -EMSGSIZE);
5024 kfree_skb(skb);
5025 goto errout;
5026 }
5027 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5028 return;
5029 errout:
5030 if (err < 0)
5031 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5032 }
5033
5034 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5035 {
5036 struct net *net = dev_net(ifp->idev->dev);
5037
5038 if (event)
5039 ASSERT_RTNL();
5040
5041 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5042
5043 switch (event) {
5044 case RTM_NEWADDR:
5045 /*
5046 * If the address was optimistic
5047 * we inserted the route at the start of
5048 * our DAD process, so we don't need
5049 * to do it again
5050 */
5051 if (!(ifp->rt->rt6i_node))
5052 ip6_ins_rt(ifp->rt);
5053 if (ifp->idev->cnf.forwarding)
5054 addrconf_join_anycast(ifp);
5055 if (!ipv6_addr_any(&ifp->peer_addr))
5056 addrconf_prefix_route(&ifp->peer_addr, 128,
5057 ifp->idev->dev, 0, 0);
5058 break;
5059 case RTM_DELADDR:
5060 if (ifp->idev->cnf.forwarding)
5061 addrconf_leave_anycast(ifp);
5062 addrconf_leave_solict(ifp->idev, &ifp->addr);
5063 if (!ipv6_addr_any(&ifp->peer_addr)) {
5064 struct rt6_info *rt;
5065
5066 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5067 ifp->idev->dev, 0, 0);
5068 if (rt && ip6_del_rt(rt))
5069 dst_free(&rt->dst);
5070 }
5071 dst_hold(&ifp->rt->dst);
5072
5073 if (ip6_del_rt(ifp->rt))
5074 dst_free(&ifp->rt->dst);
5075
5076 rt_genid_bump_ipv6(net);
5077 break;
5078 }
5079 atomic_inc(&net->ipv6.dev_addr_genid);
5080 }
5081
5082 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5083 {
5084 rcu_read_lock_bh();
5085 if (likely(ifp->idev->dead == 0))
5086 __ipv6_ifa_notify(event, ifp);
5087 rcu_read_unlock_bh();
5088 }
5089
5090 #ifdef CONFIG_SYSCTL
5091
5092 static
5093 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5094 void __user *buffer, size_t *lenp, loff_t *ppos)
5095 {
5096 int *valp = ctl->data;
5097 int val = *valp;
5098 loff_t pos = *ppos;
5099 struct ctl_table lctl;
5100 int ret;
5101
5102 /*
5103 * ctl->data points to idev->cnf.forwarding, we should
5104 * not modify it until we get the rtnl lock.
5105 */
5106 lctl = *ctl;
5107 lctl.data = &val;
5108
5109 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5110
5111 if (write)
5112 ret = addrconf_fixup_forwarding(ctl, valp, val);
5113 if (ret)
5114 *ppos = pos;
5115 return ret;
5116 }
5117
5118 static
5119 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5120 void __user *buffer, size_t *lenp, loff_t *ppos)
5121 {
5122 struct inet6_dev *idev = ctl->extra1;
5123 int min_mtu = IPV6_MIN_MTU;
5124 struct ctl_table lctl;
5125
5126 lctl = *ctl;
5127 lctl.extra1 = &min_mtu;
5128 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5129
5130 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5131 }
5132
5133 static void dev_disable_change(struct inet6_dev *idev)
5134 {
5135 struct netdev_notifier_info info;
5136
5137 if (!idev || !idev->dev)
5138 return;
5139
5140 netdev_notifier_info_init(&info, idev->dev);
5141 if (idev->cnf.disable_ipv6)
5142 addrconf_notify(NULL, NETDEV_DOWN, &info);
5143 else
5144 addrconf_notify(NULL, NETDEV_UP, &info);
5145 }
5146
5147 static void addrconf_disable_change(struct net *net, __s32 newf)
5148 {
5149 struct net_device *dev;
5150 struct inet6_dev *idev;
5151
5152 rcu_read_lock();
5153 for_each_netdev_rcu(net, dev) {
5154 idev = __in6_dev_get(dev);
5155 if (idev) {
5156 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5157 idev->cnf.disable_ipv6 = newf;
5158 if (changed)
5159 dev_disable_change(idev);
5160 }
5161 }
5162 rcu_read_unlock();
5163 }
5164
5165 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5166 {
5167 struct net *net;
5168 int old;
5169
5170 if (!rtnl_trylock())
5171 return restart_syscall();
5172
5173 net = (struct net *)table->extra2;
5174 old = *p;
5175 *p = newf;
5176
5177 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5178 rtnl_unlock();
5179 return 0;
5180 }
5181
5182 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5183 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5184 addrconf_disable_change(net, newf);
5185 } else if ((!newf) ^ (!old))
5186 dev_disable_change((struct inet6_dev *)table->extra1);
5187
5188 rtnl_unlock();
5189 return 0;
5190 }
5191
5192 static
5193 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5194 void __user *buffer, size_t *lenp, loff_t *ppos)
5195 {
5196 int *valp = ctl->data;
5197 int val = *valp;
5198 loff_t pos = *ppos;
5199 struct ctl_table lctl;
5200 int ret;
5201
5202 /*
5203 * ctl->data points to idev->cnf.disable_ipv6, we should
5204 * not modify it until we get the rtnl lock.
5205 */
5206 lctl = *ctl;
5207 lctl.data = &val;
5208
5209 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5210
5211 if (write)
5212 ret = addrconf_disable_ipv6(ctl, valp, val);
5213 if (ret)
5214 *ppos = pos;
5215 return ret;
5216 }
5217
5218 static
5219 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5220 void __user *buffer, size_t *lenp, loff_t *ppos)
5221 {
5222 int *valp = ctl->data;
5223 int ret;
5224 int old, new;
5225
5226 old = *valp;
5227 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5228 new = *valp;
5229
5230 if (write && old != new) {
5231 struct net *net = ctl->extra2;
5232
5233 if (!rtnl_trylock())
5234 return restart_syscall();
5235
5236 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5237 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5238 NETCONFA_IFINDEX_DEFAULT,
5239 net->ipv6.devconf_dflt);
5240 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5241 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5242 NETCONFA_IFINDEX_ALL,
5243 net->ipv6.devconf_all);
5244 else {
5245 struct inet6_dev *idev = ctl->extra1;
5246
5247 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5248 idev->dev->ifindex,
5249 &idev->cnf);
5250 }
5251 rtnl_unlock();
5252 }
5253
5254 return ret;
5255 }
5256
5257 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5258 void __user *buffer, size_t *lenp,
5259 loff_t *ppos)
5260 {
5261 int err;
5262 struct in6_addr addr;
5263 char str[IPV6_MAX_STRLEN];
5264 struct ctl_table lctl = *ctl;
5265 struct net *net = ctl->extra2;
5266 struct ipv6_stable_secret *secret = ctl->data;
5267
5268 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5269 return -EIO;
5270
5271 lctl.maxlen = IPV6_MAX_STRLEN;
5272 lctl.data = str;
5273
5274 if (!rtnl_trylock())
5275 return restart_syscall();
5276
5277 if (!write && !secret->initialized) {
5278 err = -EIO;
5279 goto out;
5280 }
5281
5282 if (!write) {
5283 err = snprintf(str, sizeof(str), "%pI6",
5284 &secret->secret);
5285 if (err >= sizeof(str)) {
5286 err = -EIO;
5287 goto out;
5288 }
5289 }
5290
5291 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5292 if (err || !write)
5293 goto out;
5294
5295 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5296 err = -EIO;
5297 goto out;
5298 }
5299
5300 secret->initialized = true;
5301 secret->secret = addr;
5302
5303 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5304 struct net_device *dev;
5305
5306 for_each_netdev(net, dev) {
5307 struct inet6_dev *idev = __in6_dev_get(dev);
5308
5309 if (idev) {
5310 idev->addr_gen_mode =
5311 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5312 }
5313 }
5314 } else {
5315 struct inet6_dev *idev = ctl->extra1;
5316
5317 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5318 }
5319
5320 out:
5321 rtnl_unlock();
5322
5323 return err;
5324 }
5325
5326 static struct addrconf_sysctl_table
5327 {
5328 struct ctl_table_header *sysctl_header;
5329 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5330 } addrconf_sysctl __read_mostly = {
5331 .sysctl_header = NULL,
5332 .addrconf_vars = {
5333 {
5334 .procname = "forwarding",
5335 .data = &ipv6_devconf.forwarding,
5336 .maxlen = sizeof(int),
5337 .mode = 0644,
5338 .proc_handler = addrconf_sysctl_forward,
5339 },
5340 {
5341 .procname = "hop_limit",
5342 .data = &ipv6_devconf.hop_limit,
5343 .maxlen = sizeof(int),
5344 .mode = 0644,
5345 .proc_handler = proc_dointvec,
5346 },
5347 {
5348 .procname = "mtu",
5349 .data = &ipv6_devconf.mtu6,
5350 .maxlen = sizeof(int),
5351 .mode = 0644,
5352 .proc_handler = addrconf_sysctl_mtu,
5353 },
5354 {
5355 .procname = "accept_ra",
5356 .data = &ipv6_devconf.accept_ra,
5357 .maxlen = sizeof(int),
5358 .mode = 0644,
5359 .proc_handler = proc_dointvec,
5360 },
5361 {
5362 .procname = "accept_redirects",
5363 .data = &ipv6_devconf.accept_redirects,
5364 .maxlen = sizeof(int),
5365 .mode = 0644,
5366 .proc_handler = proc_dointvec,
5367 },
5368 {
5369 .procname = "autoconf",
5370 .data = &ipv6_devconf.autoconf,
5371 .maxlen = sizeof(int),
5372 .mode = 0644,
5373 .proc_handler = proc_dointvec,
5374 },
5375 {
5376 .procname = "dad_transmits",
5377 .data = &ipv6_devconf.dad_transmits,
5378 .maxlen = sizeof(int),
5379 .mode = 0644,
5380 .proc_handler = proc_dointvec,
5381 },
5382 {
5383 .procname = "router_solicitations",
5384 .data = &ipv6_devconf.rtr_solicits,
5385 .maxlen = sizeof(int),
5386 .mode = 0644,
5387 .proc_handler = proc_dointvec,
5388 },
5389 {
5390 .procname = "router_solicitation_interval",
5391 .data = &ipv6_devconf.rtr_solicit_interval,
5392 .maxlen = sizeof(int),
5393 .mode = 0644,
5394 .proc_handler = proc_dointvec_jiffies,
5395 },
5396 {
5397 .procname = "router_solicitation_delay",
5398 .data = &ipv6_devconf.rtr_solicit_delay,
5399 .maxlen = sizeof(int),
5400 .mode = 0644,
5401 .proc_handler = proc_dointvec_jiffies,
5402 },
5403 {
5404 .procname = "force_mld_version",
5405 .data = &ipv6_devconf.force_mld_version,
5406 .maxlen = sizeof(int),
5407 .mode = 0644,
5408 .proc_handler = proc_dointvec,
5409 },
5410 {
5411 .procname = "mldv1_unsolicited_report_interval",
5412 .data =
5413 &ipv6_devconf.mldv1_unsolicited_report_interval,
5414 .maxlen = sizeof(int),
5415 .mode = 0644,
5416 .proc_handler = proc_dointvec_ms_jiffies,
5417 },
5418 {
5419 .procname = "mldv2_unsolicited_report_interval",
5420 .data =
5421 &ipv6_devconf.mldv2_unsolicited_report_interval,
5422 .maxlen = sizeof(int),
5423 .mode = 0644,
5424 .proc_handler = proc_dointvec_ms_jiffies,
5425 },
5426 {
5427 .procname = "use_tempaddr",
5428 .data = &ipv6_devconf.use_tempaddr,
5429 .maxlen = sizeof(int),
5430 .mode = 0644,
5431 .proc_handler = proc_dointvec,
5432 },
5433 {
5434 .procname = "temp_valid_lft",
5435 .data = &ipv6_devconf.temp_valid_lft,
5436 .maxlen = sizeof(int),
5437 .mode = 0644,
5438 .proc_handler = proc_dointvec,
5439 },
5440 {
5441 .procname = "temp_prefered_lft",
5442 .data = &ipv6_devconf.temp_prefered_lft,
5443 .maxlen = sizeof(int),
5444 .mode = 0644,
5445 .proc_handler = proc_dointvec,
5446 },
5447 {
5448 .procname = "regen_max_retry",
5449 .data = &ipv6_devconf.regen_max_retry,
5450 .maxlen = sizeof(int),
5451 .mode = 0644,
5452 .proc_handler = proc_dointvec,
5453 },
5454 {
5455 .procname = "max_desync_factor",
5456 .data = &ipv6_devconf.max_desync_factor,
5457 .maxlen = sizeof(int),
5458 .mode = 0644,
5459 .proc_handler = proc_dointvec,
5460 },
5461 {
5462 .procname = "max_addresses",
5463 .data = &ipv6_devconf.max_addresses,
5464 .maxlen = sizeof(int),
5465 .mode = 0644,
5466 .proc_handler = proc_dointvec,
5467 },
5468 {
5469 .procname = "accept_ra_defrtr",
5470 .data = &ipv6_devconf.accept_ra_defrtr,
5471 .maxlen = sizeof(int),
5472 .mode = 0644,
5473 .proc_handler = proc_dointvec,
5474 },
5475 {
5476 .procname = "accept_ra_pinfo",
5477 .data = &ipv6_devconf.accept_ra_pinfo,
5478 .maxlen = sizeof(int),
5479 .mode = 0644,
5480 .proc_handler = proc_dointvec,
5481 },
5482 #ifdef CONFIG_IPV6_ROUTER_PREF
5483 {
5484 .procname = "accept_ra_rtr_pref",
5485 .data = &ipv6_devconf.accept_ra_rtr_pref,
5486 .maxlen = sizeof(int),
5487 .mode = 0644,
5488 .proc_handler = proc_dointvec,
5489 },
5490 {
5491 .procname = "router_probe_interval",
5492 .data = &ipv6_devconf.rtr_probe_interval,
5493 .maxlen = sizeof(int),
5494 .mode = 0644,
5495 .proc_handler = proc_dointvec_jiffies,
5496 },
5497 #ifdef CONFIG_IPV6_ROUTE_INFO
5498 {
5499 .procname = "accept_ra_rt_info_max_plen",
5500 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5501 .maxlen = sizeof(int),
5502 .mode = 0644,
5503 .proc_handler = proc_dointvec,
5504 },
5505 #endif
5506 #endif
5507 {
5508 .procname = "proxy_ndp",
5509 .data = &ipv6_devconf.proxy_ndp,
5510 .maxlen = sizeof(int),
5511 .mode = 0644,
5512 .proc_handler = addrconf_sysctl_proxy_ndp,
5513 },
5514 {
5515 .procname = "accept_source_route",
5516 .data = &ipv6_devconf.accept_source_route,
5517 .maxlen = sizeof(int),
5518 .mode = 0644,
5519 .proc_handler = proc_dointvec,
5520 },
5521 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5522 {
5523 .procname = "optimistic_dad",
5524 .data = &ipv6_devconf.optimistic_dad,
5525 .maxlen = sizeof(int),
5526 .mode = 0644,
5527 .proc_handler = proc_dointvec,
5528
5529 },
5530 {
5531 .procname = "use_optimistic",
5532 .data = &ipv6_devconf.use_optimistic,
5533 .maxlen = sizeof(int),
5534 .mode = 0644,
5535 .proc_handler = proc_dointvec,
5536
5537 },
5538 #endif
5539 #ifdef CONFIG_IPV6_MROUTE
5540 {
5541 .procname = "mc_forwarding",
5542 .data = &ipv6_devconf.mc_forwarding,
5543 .maxlen = sizeof(int),
5544 .mode = 0444,
5545 .proc_handler = proc_dointvec,
5546 },
5547 #endif
5548 {
5549 .procname = "disable_ipv6",
5550 .data = &ipv6_devconf.disable_ipv6,
5551 .maxlen = sizeof(int),
5552 .mode = 0644,
5553 .proc_handler = addrconf_sysctl_disable,
5554 },
5555 {
5556 .procname = "accept_dad",
5557 .data = &ipv6_devconf.accept_dad,
5558 .maxlen = sizeof(int),
5559 .mode = 0644,
5560 .proc_handler = proc_dointvec,
5561 },
5562 {
5563 .procname = "force_tllao",
5564 .data = &ipv6_devconf.force_tllao,
5565 .maxlen = sizeof(int),
5566 .mode = 0644,
5567 .proc_handler = proc_dointvec
5568 },
5569 {
5570 .procname = "ndisc_notify",
5571 .data = &ipv6_devconf.ndisc_notify,
5572 .maxlen = sizeof(int),
5573 .mode = 0644,
5574 .proc_handler = proc_dointvec
5575 },
5576 {
5577 .procname = "suppress_frag_ndisc",
5578 .data = &ipv6_devconf.suppress_frag_ndisc,
5579 .maxlen = sizeof(int),
5580 .mode = 0644,
5581 .proc_handler = proc_dointvec
5582 },
5583 {
5584 .procname = "accept_ra_from_local",
5585 .data = &ipv6_devconf.accept_ra_from_local,
5586 .maxlen = sizeof(int),
5587 .mode = 0644,
5588 .proc_handler = proc_dointvec,
5589 },
5590 {
5591 .procname = "accept_ra_mtu",
5592 .data = &ipv6_devconf.accept_ra_mtu,
5593 .maxlen = sizeof(int),
5594 .mode = 0644,
5595 .proc_handler = proc_dointvec,
5596 },
5597 {
5598 .procname = "stable_secret",
5599 .data = &ipv6_devconf.stable_secret,
5600 .maxlen = IPV6_MAX_STRLEN,
5601 .mode = 0600,
5602 .proc_handler = addrconf_sysctl_stable_secret,
5603 },
5604 {
5605 /* sentinel */
5606 }
5607 },
5608 };
5609
5610 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5611 struct inet6_dev *idev, struct ipv6_devconf *p)
5612 {
5613 int i;
5614 struct addrconf_sysctl_table *t;
5615 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5616
5617 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5618 if (!t)
5619 goto out;
5620
5621 for (i = 0; t->addrconf_vars[i].data; i++) {
5622 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5623 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5624 t->addrconf_vars[i].extra2 = net;
5625 }
5626
5627 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5628
5629 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5630 if (!t->sysctl_header)
5631 goto free;
5632
5633 p->sysctl = t;
5634 return 0;
5635
5636 free:
5637 kfree(t);
5638 out:
5639 return -ENOBUFS;
5640 }
5641
5642 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5643 {
5644 struct addrconf_sysctl_table *t;
5645
5646 if (!p->sysctl)
5647 return;
5648
5649 t = p->sysctl;
5650 p->sysctl = NULL;
5651 unregister_net_sysctl_table(t->sysctl_header);
5652 kfree(t);
5653 }
5654
5655 static int addrconf_sysctl_register(struct inet6_dev *idev)
5656 {
5657 int err;
5658
5659 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5660 return -EINVAL;
5661
5662 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5663 &ndisc_ifinfo_sysctl_change);
5664 if (err)
5665 return err;
5666 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5667 idev, &idev->cnf);
5668 if (err)
5669 neigh_sysctl_unregister(idev->nd_parms);
5670
5671 return err;
5672 }
5673
5674 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5675 {
5676 __addrconf_sysctl_unregister(&idev->cnf);
5677 neigh_sysctl_unregister(idev->nd_parms);
5678 }
5679
5680
5681 #endif
5682
5683 static int __net_init addrconf_init_net(struct net *net)
5684 {
5685 int err = -ENOMEM;
5686 struct ipv6_devconf *all, *dflt;
5687
5688 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5689 if (!all)
5690 goto err_alloc_all;
5691
5692 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5693 if (!dflt)
5694 goto err_alloc_dflt;
5695
5696 /* these will be inherited by all namespaces */
5697 dflt->autoconf = ipv6_defaults.autoconf;
5698 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5699
5700 dflt->stable_secret.initialized = false;
5701 all->stable_secret.initialized = false;
5702
5703 net->ipv6.devconf_all = all;
5704 net->ipv6.devconf_dflt = dflt;
5705
5706 #ifdef CONFIG_SYSCTL
5707 err = __addrconf_sysctl_register(net, "all", NULL, all);
5708 if (err < 0)
5709 goto err_reg_all;
5710
5711 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5712 if (err < 0)
5713 goto err_reg_dflt;
5714 #endif
5715 return 0;
5716
5717 #ifdef CONFIG_SYSCTL
5718 err_reg_dflt:
5719 __addrconf_sysctl_unregister(all);
5720 err_reg_all:
5721 kfree(dflt);
5722 #endif
5723 err_alloc_dflt:
5724 kfree(all);
5725 err_alloc_all:
5726 return err;
5727 }
5728
5729 static void __net_exit addrconf_exit_net(struct net *net)
5730 {
5731 #ifdef CONFIG_SYSCTL
5732 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5733 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5734 #endif
5735 kfree(net->ipv6.devconf_dflt);
5736 kfree(net->ipv6.devconf_all);
5737 }
5738
5739 static struct pernet_operations addrconf_ops = {
5740 .init = addrconf_init_net,
5741 .exit = addrconf_exit_net,
5742 };
5743
5744 static struct rtnl_af_ops inet6_ops __read_mostly = {
5745 .family = AF_INET6,
5746 .fill_link_af = inet6_fill_link_af,
5747 .get_link_af_size = inet6_get_link_af_size,
5748 .validate_link_af = inet6_validate_link_af,
5749 .set_link_af = inet6_set_link_af,
5750 };
5751
5752 /*
5753 * Init / cleanup code
5754 */
5755
5756 int __init addrconf_init(void)
5757 {
5758 struct inet6_dev *idev;
5759 int i, err;
5760
5761 err = ipv6_addr_label_init();
5762 if (err < 0) {
5763 pr_crit("%s: cannot initialize default policy table: %d\n",
5764 __func__, err);
5765 goto out;
5766 }
5767
5768 err = register_pernet_subsys(&addrconf_ops);
5769 if (err < 0)
5770 goto out_addrlabel;
5771
5772 addrconf_wq = create_workqueue("ipv6_addrconf");
5773 if (!addrconf_wq) {
5774 err = -ENOMEM;
5775 goto out_nowq;
5776 }
5777
5778 /* The addrconf netdev notifier requires that loopback_dev
5779 * has it's ipv6 private information allocated and setup
5780 * before it can bring up and give link-local addresses
5781 * to other devices which are up.
5782 *
5783 * Unfortunately, loopback_dev is not necessarily the first
5784 * entry in the global dev_base list of net devices. In fact,
5785 * it is likely to be the very last entry on that list.
5786 * So this causes the notifier registry below to try and
5787 * give link-local addresses to all devices besides loopback_dev
5788 * first, then loopback_dev, which cases all the non-loopback_dev
5789 * devices to fail to get a link-local address.
5790 *
5791 * So, as a temporary fix, allocate the ipv6 structure for
5792 * loopback_dev first by hand.
5793 * Longer term, all of the dependencies ipv6 has upon the loopback
5794 * device and it being up should be removed.
5795 */
5796 rtnl_lock();
5797 idev = ipv6_add_dev(init_net.loopback_dev);
5798 rtnl_unlock();
5799 if (IS_ERR(idev)) {
5800 err = PTR_ERR(idev);
5801 goto errlo;
5802 }
5803
5804 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5805 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5806
5807 register_netdevice_notifier(&ipv6_dev_notf);
5808
5809 addrconf_verify();
5810
5811 rtnl_af_register(&inet6_ops);
5812
5813 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5814 NULL);
5815 if (err < 0)
5816 goto errout;
5817
5818 /* Only the first call to __rtnl_register can fail */
5819 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5820 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5821 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5822 inet6_dump_ifaddr, NULL);
5823 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5824 inet6_dump_ifmcaddr, NULL);
5825 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5826 inet6_dump_ifacaddr, NULL);
5827 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5828 inet6_netconf_dump_devconf, NULL);
5829
5830 ipv6_addr_label_rtnl_register();
5831
5832 return 0;
5833 errout:
5834 rtnl_af_unregister(&inet6_ops);
5835 unregister_netdevice_notifier(&ipv6_dev_notf);
5836 errlo:
5837 destroy_workqueue(addrconf_wq);
5838 out_nowq:
5839 unregister_pernet_subsys(&addrconf_ops);
5840 out_addrlabel:
5841 ipv6_addr_label_cleanup();
5842 out:
5843 return err;
5844 }
5845
5846 void addrconf_cleanup(void)
5847 {
5848 struct net_device *dev;
5849 int i;
5850
5851 unregister_netdevice_notifier(&ipv6_dev_notf);
5852 unregister_pernet_subsys(&addrconf_ops);
5853 ipv6_addr_label_cleanup();
5854
5855 rtnl_lock();
5856
5857 __rtnl_af_unregister(&inet6_ops);
5858
5859 /* clean dev list */
5860 for_each_netdev(&init_net, dev) {
5861 if (__in6_dev_get(dev) == NULL)
5862 continue;
5863 addrconf_ifdown(dev, 1);
5864 }
5865 addrconf_ifdown(init_net.loopback_dev, 2);
5866
5867 /*
5868 * Check hash table.
5869 */
5870 spin_lock_bh(&addrconf_hash_lock);
5871 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5872 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5873 spin_unlock_bh(&addrconf_hash_lock);
5874 cancel_delayed_work(&addr_chk_work);
5875 rtnl_unlock();
5876
5877 destroy_workqueue(addrconf_wq);
5878 }
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