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ath10k: remove htt rx amsdu clear retry bit hack
[deliverable/linux.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/in6.h>
50 #include <linux/netdevice.h>
51 #include <linux/if_addr.h>
52 #include <linux/if_arp.h>
53 #include <linux/if_arcnet.h>
54 #include <linux/if_infiniband.h>
55 #include <linux/route.h>
56 #include <linux/inetdevice.h>
57 #include <linux/init.h>
58 #include <linux/slab.h>
59 #ifdef CONFIG_SYSCTL
60 #include <linux/sysctl.h>
61 #endif
62 #include <linux/capability.h>
63 #include <linux/delay.h>
64 #include <linux/notifier.h>
65 #include <linux/string.h>
66 #include <linux/hash.h>
67
68 #include <net/net_namespace.h>
69 #include <net/sock.h>
70 #include <net/snmp.h>
71
72 #include <net/af_ieee802154.h>
73 #include <net/firewire.h>
74 #include <net/ipv6.h>
75 #include <net/protocol.h>
76 #include <net/ndisc.h>
77 #include <net/ip6_route.h>
78 #include <net/addrconf.h>
79 #include <net/tcp.h>
80 #include <net/ip.h>
81 #include <net/netlink.h>
82 #include <net/pkt_sched.h>
83 #include <linux/if_tunnel.h>
84 #include <linux/rtnetlink.h>
85 #include <linux/netconf.h>
86
87 #ifdef CONFIG_IPV6_PRIVACY
88 #include <linux/random.h>
89 #endif
90
91 #include <linux/uaccess.h>
92 #include <asm/unaligned.h>
93
94 #include <linux/proc_fs.h>
95 #include <linux/seq_file.h>
96 #include <linux/export.h>
97
98 /* Set to 3 to get tracing... */
99 #define ACONF_DEBUG 2
100
101 #if ACONF_DEBUG >= 3
102 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
103 #else
104 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
105 #endif
106
107 #define INFINITY_LIFE_TIME 0xFFFFFFFF
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 void addrconf_sysctl_register(struct inet6_dev *idev);
116 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
117 #else
118 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
119 {
120 }
121
122 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
123 {
124 }
125 #endif
126
127 #ifdef CONFIG_IPV6_PRIVACY
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 #endif
132
133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
134 static int ipv6_count_addresses(struct inet6_dev *idev);
135
136 /*
137 * Configured unicast address hash table
138 */
139 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
140 static DEFINE_SPINLOCK(addrconf_hash_lock);
141
142 static void addrconf_verify(unsigned long);
143
144 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
145 static DEFINE_SPINLOCK(addrconf_verify_lock);
146
147 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
148 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
149
150 static void addrconf_type_change(struct net_device *dev,
151 unsigned long event);
152 static int addrconf_ifdown(struct net_device *dev, int how);
153
154 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
155 int plen,
156 const struct net_device *dev,
157 u32 flags, u32 noflags);
158
159 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
160 static void addrconf_dad_timer(unsigned long data);
161 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
162 static void addrconf_dad_run(struct inet6_dev *idev);
163 static void addrconf_rs_timer(unsigned long data);
164 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
165 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
166
167 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
168 struct prefix_info *pinfo);
169 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
170 struct net_device *dev);
171
172 static struct ipv6_devconf ipv6_devconf __read_mostly = {
173 .forwarding = 0,
174 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
175 .mtu6 = IPV6_MIN_MTU,
176 .accept_ra = 1,
177 .accept_redirects = 1,
178 .autoconf = 1,
179 .force_mld_version = 0,
180 .mldv1_unsolicited_report_interval = 10 * HZ,
181 .mldv2_unsolicited_report_interval = HZ,
182 .dad_transmits = 1,
183 .rtr_solicits = MAX_RTR_SOLICITATIONS,
184 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
185 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
186 #ifdef CONFIG_IPV6_PRIVACY
187 .use_tempaddr = 0,
188 .temp_valid_lft = TEMP_VALID_LIFETIME,
189 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
190 .regen_max_retry = REGEN_MAX_RETRY,
191 .max_desync_factor = MAX_DESYNC_FACTOR,
192 #endif
193 .max_addresses = IPV6_MAX_ADDRESSES,
194 .accept_ra_defrtr = 1,
195 .accept_ra_pinfo = 1,
196 #ifdef CONFIG_IPV6_ROUTER_PREF
197 .accept_ra_rtr_pref = 1,
198 .rtr_probe_interval = 60 * HZ,
199 #ifdef CONFIG_IPV6_ROUTE_INFO
200 .accept_ra_rt_info_max_plen = 0,
201 #endif
202 #endif
203 .proxy_ndp = 0,
204 .accept_source_route = 0, /* we do not accept RH0 by default. */
205 .disable_ipv6 = 0,
206 .accept_dad = 1,
207 .suppress_frag_ndisc = 1,
208 };
209
210 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
211 .forwarding = 0,
212 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
213 .mtu6 = IPV6_MIN_MTU,
214 .accept_ra = 1,
215 .accept_redirects = 1,
216 .autoconf = 1,
217 .force_mld_version = 0,
218 .mldv1_unsolicited_report_interval = 10 * HZ,
219 .mldv2_unsolicited_report_interval = HZ,
220 .dad_transmits = 1,
221 .rtr_solicits = MAX_RTR_SOLICITATIONS,
222 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
223 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
224 #ifdef CONFIG_IPV6_PRIVACY
225 .use_tempaddr = 0,
226 .temp_valid_lft = TEMP_VALID_LIFETIME,
227 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
228 .regen_max_retry = REGEN_MAX_RETRY,
229 .max_desync_factor = MAX_DESYNC_FACTOR,
230 #endif
231 .max_addresses = IPV6_MAX_ADDRESSES,
232 .accept_ra_defrtr = 1,
233 .accept_ra_pinfo = 1,
234 #ifdef CONFIG_IPV6_ROUTER_PREF
235 .accept_ra_rtr_pref = 1,
236 .rtr_probe_interval = 60 * HZ,
237 #ifdef CONFIG_IPV6_ROUTE_INFO
238 .accept_ra_rt_info_max_plen = 0,
239 #endif
240 #endif
241 .proxy_ndp = 0,
242 .accept_source_route = 0, /* we do not accept RH0 by default. */
243 .disable_ipv6 = 0,
244 .accept_dad = 1,
245 .suppress_frag_ndisc = 1,
246 };
247
248 /* Check if a valid qdisc is available */
249 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
250 {
251 return !qdisc_tx_is_noop(dev);
252 }
253
254 static void addrconf_del_rs_timer(struct inet6_dev *idev)
255 {
256 if (del_timer(&idev->rs_timer))
257 __in6_dev_put(idev);
258 }
259
260 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
261 {
262 if (del_timer(&ifp->dad_timer))
263 __in6_ifa_put(ifp);
264 }
265
266 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
267 unsigned long when)
268 {
269 if (!timer_pending(&idev->rs_timer))
270 in6_dev_hold(idev);
271 mod_timer(&idev->rs_timer, jiffies + when);
272 }
273
274 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
275 unsigned long when)
276 {
277 if (!timer_pending(&ifp->dad_timer))
278 in6_ifa_hold(ifp);
279 mod_timer(&ifp->dad_timer, jiffies + when);
280 }
281
282 static int snmp6_alloc_dev(struct inet6_dev *idev)
283 {
284 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
285 sizeof(struct ipstats_mib),
286 __alignof__(struct ipstats_mib)) < 0)
287 goto err_ip;
288 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
289 GFP_KERNEL);
290 if (!idev->stats.icmpv6dev)
291 goto err_icmp;
292 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
293 GFP_KERNEL);
294 if (!idev->stats.icmpv6msgdev)
295 goto err_icmpmsg;
296
297 return 0;
298
299 err_icmpmsg:
300 kfree(idev->stats.icmpv6dev);
301 err_icmp:
302 snmp_mib_free((void __percpu **)idev->stats.ipv6);
303 err_ip:
304 return -ENOMEM;
305 }
306
307 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
308 {
309 struct inet6_dev *ndev;
310
311 ASSERT_RTNL();
312
313 if (dev->mtu < IPV6_MIN_MTU)
314 return NULL;
315
316 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
317
318 if (ndev == NULL)
319 return NULL;
320
321 rwlock_init(&ndev->lock);
322 ndev->dev = dev;
323 INIT_LIST_HEAD(&ndev->addr_list);
324 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
325 (unsigned long)ndev);
326 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
327 ndev->cnf.mtu6 = dev->mtu;
328 ndev->cnf.sysctl = NULL;
329 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
330 if (ndev->nd_parms == NULL) {
331 kfree(ndev);
332 return NULL;
333 }
334 if (ndev->cnf.forwarding)
335 dev_disable_lro(dev);
336 /* We refer to the device */
337 dev_hold(dev);
338
339 if (snmp6_alloc_dev(ndev) < 0) {
340 ADBG(KERN_WARNING
341 "%s: cannot allocate memory for statistics; dev=%s.\n",
342 __func__, dev->name);
343 neigh_parms_release(&nd_tbl, ndev->nd_parms);
344 dev_put(dev);
345 kfree(ndev);
346 return NULL;
347 }
348
349 if (snmp6_register_dev(ndev) < 0) {
350 ADBG(KERN_WARNING
351 "%s: cannot create /proc/net/dev_snmp6/%s\n",
352 __func__, dev->name);
353 neigh_parms_release(&nd_tbl, ndev->nd_parms);
354 ndev->dead = 1;
355 in6_dev_finish_destroy(ndev);
356 return NULL;
357 }
358
359 /* One reference from device. We must do this before
360 * we invoke __ipv6_regen_rndid().
361 */
362 in6_dev_hold(ndev);
363
364 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
365 ndev->cnf.accept_dad = -1;
366
367 #if IS_ENABLED(CONFIG_IPV6_SIT)
368 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
369 pr_info("%s: Disabled Multicast RS\n", dev->name);
370 ndev->cnf.rtr_solicits = 0;
371 }
372 #endif
373
374 #ifdef CONFIG_IPV6_PRIVACY
375 INIT_LIST_HEAD(&ndev->tempaddr_list);
376 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
377 if ((dev->flags&IFF_LOOPBACK) ||
378 dev->type == ARPHRD_TUNNEL ||
379 dev->type == ARPHRD_TUNNEL6 ||
380 dev->type == ARPHRD_SIT ||
381 dev->type == ARPHRD_NONE) {
382 ndev->cnf.use_tempaddr = -1;
383 } else {
384 in6_dev_hold(ndev);
385 ipv6_regen_rndid((unsigned long) ndev);
386 }
387 #endif
388 ndev->token = in6addr_any;
389
390 if (netif_running(dev) && addrconf_qdisc_ok(dev))
391 ndev->if_flags |= IF_READY;
392
393 ipv6_mc_init_dev(ndev);
394 ndev->tstamp = jiffies;
395 addrconf_sysctl_register(ndev);
396 /* protected by rtnl_lock */
397 rcu_assign_pointer(dev->ip6_ptr, ndev);
398
399 /* Join interface-local all-node multicast group */
400 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
401
402 /* Join all-node multicast group */
403 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
404
405 /* Join all-router multicast group if forwarding is set */
406 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
407 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
408
409 return ndev;
410 }
411
412 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
413 {
414 struct inet6_dev *idev;
415
416 ASSERT_RTNL();
417
418 idev = __in6_dev_get(dev);
419 if (!idev) {
420 idev = ipv6_add_dev(dev);
421 if (!idev)
422 return NULL;
423 }
424
425 if (dev->flags&IFF_UP)
426 ipv6_mc_up(idev);
427 return idev;
428 }
429
430 static int inet6_netconf_msgsize_devconf(int type)
431 {
432 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
433 + nla_total_size(4); /* NETCONFA_IFINDEX */
434
435 /* type -1 is used for ALL */
436 if (type == -1 || type == NETCONFA_FORWARDING)
437 size += nla_total_size(4);
438 #ifdef CONFIG_IPV6_MROUTE
439 if (type == -1 || type == NETCONFA_MC_FORWARDING)
440 size += nla_total_size(4);
441 #endif
442
443 return size;
444 }
445
446 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
447 struct ipv6_devconf *devconf, u32 portid,
448 u32 seq, int event, unsigned int flags,
449 int type)
450 {
451 struct nlmsghdr *nlh;
452 struct netconfmsg *ncm;
453
454 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
455 flags);
456 if (nlh == NULL)
457 return -EMSGSIZE;
458
459 ncm = nlmsg_data(nlh);
460 ncm->ncm_family = AF_INET6;
461
462 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
463 goto nla_put_failure;
464
465 /* type -1 is used for ALL */
466 if ((type == -1 || type == NETCONFA_FORWARDING) &&
467 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
468 goto nla_put_failure;
469 #ifdef CONFIG_IPV6_MROUTE
470 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
471 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
472 devconf->mc_forwarding) < 0)
473 goto nla_put_failure;
474 #endif
475 return nlmsg_end(skb, nlh);
476
477 nla_put_failure:
478 nlmsg_cancel(skb, nlh);
479 return -EMSGSIZE;
480 }
481
482 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
483 struct ipv6_devconf *devconf)
484 {
485 struct sk_buff *skb;
486 int err = -ENOBUFS;
487
488 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
489 if (skb == NULL)
490 goto errout;
491
492 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
493 RTM_NEWNETCONF, 0, type);
494 if (err < 0) {
495 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
496 WARN_ON(err == -EMSGSIZE);
497 kfree_skb(skb);
498 goto errout;
499 }
500 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
501 return;
502 errout:
503 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
504 }
505
506 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
507 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
508 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
509 };
510
511 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
512 struct nlmsghdr *nlh)
513 {
514 struct net *net = sock_net(in_skb->sk);
515 struct nlattr *tb[NETCONFA_MAX+1];
516 struct netconfmsg *ncm;
517 struct sk_buff *skb;
518 struct ipv6_devconf *devconf;
519 struct inet6_dev *in6_dev;
520 struct net_device *dev;
521 int ifindex;
522 int err;
523
524 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
525 devconf_ipv6_policy);
526 if (err < 0)
527 goto errout;
528
529 err = EINVAL;
530 if (!tb[NETCONFA_IFINDEX])
531 goto errout;
532
533 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
534 switch (ifindex) {
535 case NETCONFA_IFINDEX_ALL:
536 devconf = net->ipv6.devconf_all;
537 break;
538 case NETCONFA_IFINDEX_DEFAULT:
539 devconf = net->ipv6.devconf_dflt;
540 break;
541 default:
542 dev = __dev_get_by_index(net, ifindex);
543 if (dev == NULL)
544 goto errout;
545 in6_dev = __in6_dev_get(dev);
546 if (in6_dev == NULL)
547 goto errout;
548 devconf = &in6_dev->cnf;
549 break;
550 }
551
552 err = -ENOBUFS;
553 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
554 if (skb == NULL)
555 goto errout;
556
557 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
558 NETLINK_CB(in_skb).portid,
559 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
560 -1);
561 if (err < 0) {
562 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
563 WARN_ON(err == -EMSGSIZE);
564 kfree_skb(skb);
565 goto errout;
566 }
567 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
568 errout:
569 return err;
570 }
571
572 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
573 struct netlink_callback *cb)
574 {
575 struct net *net = sock_net(skb->sk);
576 int h, s_h;
577 int idx, s_idx;
578 struct net_device *dev;
579 struct inet6_dev *idev;
580 struct hlist_head *head;
581
582 s_h = cb->args[0];
583 s_idx = idx = cb->args[1];
584
585 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
586 idx = 0;
587 head = &net->dev_index_head[h];
588 rcu_read_lock();
589 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
590 net->dev_base_seq;
591 hlist_for_each_entry_rcu(dev, head, index_hlist) {
592 if (idx < s_idx)
593 goto cont;
594 idev = __in6_dev_get(dev);
595 if (!idev)
596 goto cont;
597
598 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
599 &idev->cnf,
600 NETLINK_CB(cb->skb).portid,
601 cb->nlh->nlmsg_seq,
602 RTM_NEWNETCONF,
603 NLM_F_MULTI,
604 -1) <= 0) {
605 rcu_read_unlock();
606 goto done;
607 }
608 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
609 cont:
610 idx++;
611 }
612 rcu_read_unlock();
613 }
614 if (h == NETDEV_HASHENTRIES) {
615 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
616 net->ipv6.devconf_all,
617 NETLINK_CB(cb->skb).portid,
618 cb->nlh->nlmsg_seq,
619 RTM_NEWNETCONF, NLM_F_MULTI,
620 -1) <= 0)
621 goto done;
622 else
623 h++;
624 }
625 if (h == NETDEV_HASHENTRIES + 1) {
626 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
627 net->ipv6.devconf_dflt,
628 NETLINK_CB(cb->skb).portid,
629 cb->nlh->nlmsg_seq,
630 RTM_NEWNETCONF, NLM_F_MULTI,
631 -1) <= 0)
632 goto done;
633 else
634 h++;
635 }
636 done:
637 cb->args[0] = h;
638 cb->args[1] = idx;
639
640 return skb->len;
641 }
642
643 #ifdef CONFIG_SYSCTL
644 static void dev_forward_change(struct inet6_dev *idev)
645 {
646 struct net_device *dev;
647 struct inet6_ifaddr *ifa;
648
649 if (!idev)
650 return;
651 dev = idev->dev;
652 if (idev->cnf.forwarding)
653 dev_disable_lro(dev);
654 if (dev->flags & IFF_MULTICAST) {
655 if (idev->cnf.forwarding) {
656 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
657 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
658 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
659 } else {
660 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
661 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
662 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
663 }
664 }
665
666 list_for_each_entry(ifa, &idev->addr_list, if_list) {
667 if (ifa->flags&IFA_F_TENTATIVE)
668 continue;
669 if (idev->cnf.forwarding)
670 addrconf_join_anycast(ifa);
671 else
672 addrconf_leave_anycast(ifa);
673 }
674 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
675 dev->ifindex, &idev->cnf);
676 }
677
678
679 static void addrconf_forward_change(struct net *net, __s32 newf)
680 {
681 struct net_device *dev;
682 struct inet6_dev *idev;
683
684 for_each_netdev(net, dev) {
685 idev = __in6_dev_get(dev);
686 if (idev) {
687 int changed = (!idev->cnf.forwarding) ^ (!newf);
688 idev->cnf.forwarding = newf;
689 if (changed)
690 dev_forward_change(idev);
691 }
692 }
693 }
694
695 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
696 {
697 struct net *net;
698 int old;
699
700 if (!rtnl_trylock())
701 return restart_syscall();
702
703 net = (struct net *)table->extra2;
704 old = *p;
705 *p = newf;
706
707 if (p == &net->ipv6.devconf_dflt->forwarding) {
708 if ((!newf) ^ (!old))
709 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
710 NETCONFA_IFINDEX_DEFAULT,
711 net->ipv6.devconf_dflt);
712 rtnl_unlock();
713 return 0;
714 }
715
716 if (p == &net->ipv6.devconf_all->forwarding) {
717 net->ipv6.devconf_dflt->forwarding = newf;
718 addrconf_forward_change(net, newf);
719 if ((!newf) ^ (!old))
720 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
721 NETCONFA_IFINDEX_ALL,
722 net->ipv6.devconf_all);
723 } else if ((!newf) ^ (!old))
724 dev_forward_change((struct inet6_dev *)table->extra1);
725 rtnl_unlock();
726
727 if (newf)
728 rt6_purge_dflt_routers(net);
729 return 1;
730 }
731 #endif
732
733 /* Nobody refers to this ifaddr, destroy it */
734 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
735 {
736 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
737
738 #ifdef NET_REFCNT_DEBUG
739 pr_debug("%s\n", __func__);
740 #endif
741
742 in6_dev_put(ifp->idev);
743
744 if (del_timer(&ifp->dad_timer))
745 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
746
747 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
748 pr_warn("Freeing alive inet6 address %p\n", ifp);
749 return;
750 }
751 ip6_rt_put(ifp->rt);
752
753 kfree_rcu(ifp, rcu);
754 }
755
756 static void
757 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
758 {
759 struct list_head *p;
760 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
761
762 /*
763 * Each device address list is sorted in order of scope -
764 * global before linklocal.
765 */
766 list_for_each(p, &idev->addr_list) {
767 struct inet6_ifaddr *ifa
768 = list_entry(p, struct inet6_ifaddr, if_list);
769 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
770 break;
771 }
772
773 list_add_tail(&ifp->if_list, p);
774 }
775
776 static u32 inet6_addr_hash(const struct in6_addr *addr)
777 {
778 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
779 }
780
781 /* On success it returns ifp with increased reference count */
782
783 static struct inet6_ifaddr *
784 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
785 const struct in6_addr *peer_addr, int pfxlen,
786 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
787 {
788 struct inet6_ifaddr *ifa = NULL;
789 struct rt6_info *rt;
790 unsigned int hash;
791 int err = 0;
792 int addr_type = ipv6_addr_type(addr);
793
794 if (addr_type == IPV6_ADDR_ANY ||
795 addr_type & IPV6_ADDR_MULTICAST ||
796 (!(idev->dev->flags & IFF_LOOPBACK) &&
797 addr_type & IPV6_ADDR_LOOPBACK))
798 return ERR_PTR(-EADDRNOTAVAIL);
799
800 rcu_read_lock_bh();
801 if (idev->dead) {
802 err = -ENODEV; /*XXX*/
803 goto out2;
804 }
805
806 if (idev->cnf.disable_ipv6) {
807 err = -EACCES;
808 goto out2;
809 }
810
811 spin_lock(&addrconf_hash_lock);
812
813 /* Ignore adding duplicate addresses on an interface */
814 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
815 ADBG("ipv6_add_addr: already assigned\n");
816 err = -EEXIST;
817 goto out;
818 }
819
820 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
821
822 if (ifa == NULL) {
823 ADBG("ipv6_add_addr: malloc failed\n");
824 err = -ENOBUFS;
825 goto out;
826 }
827
828 rt = addrconf_dst_alloc(idev, addr, false);
829 if (IS_ERR(rt)) {
830 err = PTR_ERR(rt);
831 goto out;
832 }
833
834 ifa->addr = *addr;
835 if (peer_addr)
836 ifa->peer_addr = *peer_addr;
837
838 spin_lock_init(&ifa->lock);
839 spin_lock_init(&ifa->state_lock);
840 setup_timer(&ifa->dad_timer, addrconf_dad_timer,
841 (unsigned long)ifa);
842 INIT_HLIST_NODE(&ifa->addr_lst);
843 ifa->scope = scope;
844 ifa->prefix_len = pfxlen;
845 ifa->flags = flags | IFA_F_TENTATIVE;
846 ifa->valid_lft = valid_lft;
847 ifa->prefered_lft = prefered_lft;
848 ifa->cstamp = ifa->tstamp = jiffies;
849 ifa->tokenized = false;
850
851 ifa->rt = rt;
852
853 ifa->idev = idev;
854 in6_dev_hold(idev);
855 /* For caller */
856 in6_ifa_hold(ifa);
857
858 /* Add to big hash table */
859 hash = inet6_addr_hash(addr);
860
861 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
862 spin_unlock(&addrconf_hash_lock);
863
864 write_lock(&idev->lock);
865 /* Add to inet6_dev unicast addr list. */
866 ipv6_link_dev_addr(idev, ifa);
867
868 #ifdef CONFIG_IPV6_PRIVACY
869 if (ifa->flags&IFA_F_TEMPORARY) {
870 list_add(&ifa->tmp_list, &idev->tempaddr_list);
871 in6_ifa_hold(ifa);
872 }
873 #endif
874
875 in6_ifa_hold(ifa);
876 write_unlock(&idev->lock);
877 out2:
878 rcu_read_unlock_bh();
879
880 if (likely(err == 0))
881 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
882 else {
883 kfree(ifa);
884 ifa = ERR_PTR(err);
885 }
886
887 return ifa;
888 out:
889 spin_unlock(&addrconf_hash_lock);
890 goto out2;
891 }
892
893 /* This function wants to get referenced ifp and releases it before return */
894
895 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
896 {
897 struct inet6_ifaddr *ifa, *ifn;
898 struct inet6_dev *idev = ifp->idev;
899 int state;
900 int deleted = 0, onlink = 0;
901 unsigned long expires = jiffies;
902
903 spin_lock_bh(&ifp->state_lock);
904 state = ifp->state;
905 ifp->state = INET6_IFADDR_STATE_DEAD;
906 spin_unlock_bh(&ifp->state_lock);
907
908 if (state == INET6_IFADDR_STATE_DEAD)
909 goto out;
910
911 spin_lock_bh(&addrconf_hash_lock);
912 hlist_del_init_rcu(&ifp->addr_lst);
913 spin_unlock_bh(&addrconf_hash_lock);
914
915 write_lock_bh(&idev->lock);
916 #ifdef CONFIG_IPV6_PRIVACY
917 if (ifp->flags&IFA_F_TEMPORARY) {
918 list_del(&ifp->tmp_list);
919 if (ifp->ifpub) {
920 in6_ifa_put(ifp->ifpub);
921 ifp->ifpub = NULL;
922 }
923 __in6_ifa_put(ifp);
924 }
925 #endif
926
927 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
928 if (ifa == ifp) {
929 list_del_init(&ifp->if_list);
930 __in6_ifa_put(ifp);
931
932 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
933 break;
934 deleted = 1;
935 continue;
936 } else if (ifp->flags & IFA_F_PERMANENT) {
937 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
938 ifp->prefix_len)) {
939 if (ifa->flags & IFA_F_PERMANENT) {
940 onlink = 1;
941 if (deleted)
942 break;
943 } else {
944 unsigned long lifetime;
945
946 if (!onlink)
947 onlink = -1;
948
949 spin_lock(&ifa->lock);
950
951 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
952 /*
953 * Note: Because this address is
954 * not permanent, lifetime <
955 * LONG_MAX / HZ here.
956 */
957 if (time_before(expires,
958 ifa->tstamp + lifetime * HZ))
959 expires = ifa->tstamp + lifetime * HZ;
960 spin_unlock(&ifa->lock);
961 }
962 }
963 }
964 }
965 write_unlock_bh(&idev->lock);
966
967 addrconf_del_dad_timer(ifp);
968
969 ipv6_ifa_notify(RTM_DELADDR, ifp);
970
971 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
972
973 /*
974 * Purge or update corresponding prefix
975 *
976 * 1) we don't purge prefix here if address was not permanent.
977 * prefix is managed by its own lifetime.
978 * 2) if there're no addresses, delete prefix.
979 * 3) if there're still other permanent address(es),
980 * corresponding prefix is still permanent.
981 * 4) otherwise, update prefix lifetime to the
982 * longest valid lifetime among the corresponding
983 * addresses on the device.
984 * Note: subsequent RA will update lifetime.
985 *
986 * --yoshfuji
987 */
988 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
989 struct in6_addr prefix;
990 struct rt6_info *rt;
991
992 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
993
994 rt = addrconf_get_prefix_route(&prefix,
995 ifp->prefix_len,
996 ifp->idev->dev,
997 0, RTF_GATEWAY | RTF_DEFAULT);
998
999 if (rt) {
1000 if (onlink == 0) {
1001 ip6_del_rt(rt);
1002 rt = NULL;
1003 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1004 rt6_set_expires(rt, expires);
1005 }
1006 }
1007 ip6_rt_put(rt);
1008 }
1009
1010 /* clean up prefsrc entries */
1011 rt6_remove_prefsrc(ifp);
1012 out:
1013 in6_ifa_put(ifp);
1014 }
1015
1016 #ifdef CONFIG_IPV6_PRIVACY
1017 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1018 {
1019 struct inet6_dev *idev = ifp->idev;
1020 struct in6_addr addr, *tmpaddr;
1021 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1022 unsigned long regen_advance;
1023 int tmp_plen;
1024 int ret = 0;
1025 u32 addr_flags;
1026 unsigned long now = jiffies;
1027
1028 write_lock(&idev->lock);
1029 if (ift) {
1030 spin_lock_bh(&ift->lock);
1031 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1032 spin_unlock_bh(&ift->lock);
1033 tmpaddr = &addr;
1034 } else {
1035 tmpaddr = NULL;
1036 }
1037 retry:
1038 in6_dev_hold(idev);
1039 if (idev->cnf.use_tempaddr <= 0) {
1040 write_unlock(&idev->lock);
1041 pr_info("%s: use_tempaddr is disabled\n", __func__);
1042 in6_dev_put(idev);
1043 ret = -1;
1044 goto out;
1045 }
1046 spin_lock_bh(&ifp->lock);
1047 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1048 idev->cnf.use_tempaddr = -1; /*XXX*/
1049 spin_unlock_bh(&ifp->lock);
1050 write_unlock(&idev->lock);
1051 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1052 __func__);
1053 in6_dev_put(idev);
1054 ret = -1;
1055 goto out;
1056 }
1057 in6_ifa_hold(ifp);
1058 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1059 __ipv6_try_regen_rndid(idev, tmpaddr);
1060 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1061 age = (now - ifp->tstamp) / HZ;
1062 tmp_valid_lft = min_t(__u32,
1063 ifp->valid_lft,
1064 idev->cnf.temp_valid_lft + age);
1065 tmp_prefered_lft = min_t(__u32,
1066 ifp->prefered_lft,
1067 idev->cnf.temp_prefered_lft + age -
1068 idev->cnf.max_desync_factor);
1069 tmp_plen = ifp->prefix_len;
1070 tmp_tstamp = ifp->tstamp;
1071 spin_unlock_bh(&ifp->lock);
1072
1073 regen_advance = idev->cnf.regen_max_retry *
1074 idev->cnf.dad_transmits *
1075 idev->nd_parms->retrans_time / HZ;
1076 write_unlock(&idev->lock);
1077
1078 /* A temporary address is created only if this calculated Preferred
1079 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1080 * an implementation must not create a temporary address with a zero
1081 * Preferred Lifetime.
1082 */
1083 if (tmp_prefered_lft <= regen_advance) {
1084 in6_ifa_put(ifp);
1085 in6_dev_put(idev);
1086 ret = -1;
1087 goto out;
1088 }
1089
1090 addr_flags = IFA_F_TEMPORARY;
1091 /* set in addrconf_prefix_rcv() */
1092 if (ifp->flags & IFA_F_OPTIMISTIC)
1093 addr_flags |= IFA_F_OPTIMISTIC;
1094
1095 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1096 ipv6_addr_scope(&addr), addr_flags,
1097 tmp_valid_lft, tmp_prefered_lft);
1098 if (IS_ERR(ift)) {
1099 in6_ifa_put(ifp);
1100 in6_dev_put(idev);
1101 pr_info("%s: retry temporary address regeneration\n", __func__);
1102 tmpaddr = &addr;
1103 write_lock(&idev->lock);
1104 goto retry;
1105 }
1106
1107 spin_lock_bh(&ift->lock);
1108 ift->ifpub = ifp;
1109 ift->cstamp = now;
1110 ift->tstamp = tmp_tstamp;
1111 spin_unlock_bh(&ift->lock);
1112
1113 addrconf_dad_start(ift);
1114 in6_ifa_put(ift);
1115 in6_dev_put(idev);
1116 out:
1117 return ret;
1118 }
1119 #endif
1120
1121 /*
1122 * Choose an appropriate source address (RFC3484)
1123 */
1124 enum {
1125 IPV6_SADDR_RULE_INIT = 0,
1126 IPV6_SADDR_RULE_LOCAL,
1127 IPV6_SADDR_RULE_SCOPE,
1128 IPV6_SADDR_RULE_PREFERRED,
1129 #ifdef CONFIG_IPV6_MIP6
1130 IPV6_SADDR_RULE_HOA,
1131 #endif
1132 IPV6_SADDR_RULE_OIF,
1133 IPV6_SADDR_RULE_LABEL,
1134 #ifdef CONFIG_IPV6_PRIVACY
1135 IPV6_SADDR_RULE_PRIVACY,
1136 #endif
1137 IPV6_SADDR_RULE_ORCHID,
1138 IPV6_SADDR_RULE_PREFIX,
1139 IPV6_SADDR_RULE_MAX
1140 };
1141
1142 struct ipv6_saddr_score {
1143 int rule;
1144 int addr_type;
1145 struct inet6_ifaddr *ifa;
1146 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1147 int scopedist;
1148 int matchlen;
1149 };
1150
1151 struct ipv6_saddr_dst {
1152 const struct in6_addr *addr;
1153 int ifindex;
1154 int scope;
1155 int label;
1156 unsigned int prefs;
1157 };
1158
1159 static inline int ipv6_saddr_preferred(int type)
1160 {
1161 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1162 return 1;
1163 return 0;
1164 }
1165
1166 static int ipv6_get_saddr_eval(struct net *net,
1167 struct ipv6_saddr_score *score,
1168 struct ipv6_saddr_dst *dst,
1169 int i)
1170 {
1171 int ret;
1172
1173 if (i <= score->rule) {
1174 switch (i) {
1175 case IPV6_SADDR_RULE_SCOPE:
1176 ret = score->scopedist;
1177 break;
1178 case IPV6_SADDR_RULE_PREFIX:
1179 ret = score->matchlen;
1180 break;
1181 default:
1182 ret = !!test_bit(i, score->scorebits);
1183 }
1184 goto out;
1185 }
1186
1187 switch (i) {
1188 case IPV6_SADDR_RULE_INIT:
1189 /* Rule 0: remember if hiscore is not ready yet */
1190 ret = !!score->ifa;
1191 break;
1192 case IPV6_SADDR_RULE_LOCAL:
1193 /* Rule 1: Prefer same address */
1194 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1195 break;
1196 case IPV6_SADDR_RULE_SCOPE:
1197 /* Rule 2: Prefer appropriate scope
1198 *
1199 * ret
1200 * ^
1201 * -1 | d 15
1202 * ---+--+-+---> scope
1203 * |
1204 * | d is scope of the destination.
1205 * B-d | \
1206 * | \ <- smaller scope is better if
1207 * B-15 | \ if scope is enough for destinaion.
1208 * | ret = B - scope (-1 <= scope >= d <= 15).
1209 * d-C-1 | /
1210 * |/ <- greater is better
1211 * -C / if scope is not enough for destination.
1212 * /| ret = scope - C (-1 <= d < scope <= 15).
1213 *
1214 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1215 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1216 * Assume B = 0 and we get C > 29.
1217 */
1218 ret = __ipv6_addr_src_scope(score->addr_type);
1219 if (ret >= dst->scope)
1220 ret = -ret;
1221 else
1222 ret -= 128; /* 30 is enough */
1223 score->scopedist = ret;
1224 break;
1225 case IPV6_SADDR_RULE_PREFERRED:
1226 /* Rule 3: Avoid deprecated and optimistic addresses */
1227 ret = ipv6_saddr_preferred(score->addr_type) ||
1228 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1229 break;
1230 #ifdef CONFIG_IPV6_MIP6
1231 case IPV6_SADDR_RULE_HOA:
1232 {
1233 /* Rule 4: Prefer home address */
1234 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1235 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1236 break;
1237 }
1238 #endif
1239 case IPV6_SADDR_RULE_OIF:
1240 /* Rule 5: Prefer outgoing interface */
1241 ret = (!dst->ifindex ||
1242 dst->ifindex == score->ifa->idev->dev->ifindex);
1243 break;
1244 case IPV6_SADDR_RULE_LABEL:
1245 /* Rule 6: Prefer matching label */
1246 ret = ipv6_addr_label(net,
1247 &score->ifa->addr, score->addr_type,
1248 score->ifa->idev->dev->ifindex) == dst->label;
1249 break;
1250 #ifdef CONFIG_IPV6_PRIVACY
1251 case IPV6_SADDR_RULE_PRIVACY:
1252 {
1253 /* Rule 7: Prefer public address
1254 * Note: prefer temporary address if use_tempaddr >= 2
1255 */
1256 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1257 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1258 score->ifa->idev->cnf.use_tempaddr >= 2;
1259 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1260 break;
1261 }
1262 #endif
1263 case IPV6_SADDR_RULE_ORCHID:
1264 /* Rule 8-: Prefer ORCHID vs ORCHID or
1265 * non-ORCHID vs non-ORCHID
1266 */
1267 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1268 ipv6_addr_orchid(dst->addr));
1269 break;
1270 case IPV6_SADDR_RULE_PREFIX:
1271 /* Rule 8: Use longest matching prefix */
1272 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1273 if (ret > score->ifa->prefix_len)
1274 ret = score->ifa->prefix_len;
1275 score->matchlen = ret;
1276 break;
1277 default:
1278 ret = 0;
1279 }
1280
1281 if (ret)
1282 __set_bit(i, score->scorebits);
1283 score->rule = i;
1284 out:
1285 return ret;
1286 }
1287
1288 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1289 const struct in6_addr *daddr, unsigned int prefs,
1290 struct in6_addr *saddr)
1291 {
1292 struct ipv6_saddr_score scores[2],
1293 *score = &scores[0], *hiscore = &scores[1];
1294 struct ipv6_saddr_dst dst;
1295 struct net_device *dev;
1296 int dst_type;
1297
1298 dst_type = __ipv6_addr_type(daddr);
1299 dst.addr = daddr;
1300 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1301 dst.scope = __ipv6_addr_src_scope(dst_type);
1302 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1303 dst.prefs = prefs;
1304
1305 hiscore->rule = -1;
1306 hiscore->ifa = NULL;
1307
1308 rcu_read_lock();
1309
1310 for_each_netdev_rcu(net, dev) {
1311 struct inet6_dev *idev;
1312
1313 /* Candidate Source Address (section 4)
1314 * - multicast and link-local destination address,
1315 * the set of candidate source address MUST only
1316 * include addresses assigned to interfaces
1317 * belonging to the same link as the outgoing
1318 * interface.
1319 * (- For site-local destination addresses, the
1320 * set of candidate source addresses MUST only
1321 * include addresses assigned to interfaces
1322 * belonging to the same site as the outgoing
1323 * interface.)
1324 */
1325 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1326 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1327 dst.ifindex && dev->ifindex != dst.ifindex)
1328 continue;
1329
1330 idev = __in6_dev_get(dev);
1331 if (!idev)
1332 continue;
1333
1334 read_lock_bh(&idev->lock);
1335 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1336 int i;
1337
1338 /*
1339 * - Tentative Address (RFC2462 section 5.4)
1340 * - A tentative address is not considered
1341 * "assigned to an interface" in the traditional
1342 * sense, unless it is also flagged as optimistic.
1343 * - Candidate Source Address (section 4)
1344 * - In any case, anycast addresses, multicast
1345 * addresses, and the unspecified address MUST
1346 * NOT be included in a candidate set.
1347 */
1348 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1349 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1350 continue;
1351
1352 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1353
1354 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1355 score->addr_type & IPV6_ADDR_MULTICAST)) {
1356 LIMIT_NETDEBUG(KERN_DEBUG
1357 "ADDRCONF: unspecified / multicast address "
1358 "assigned as unicast address on %s",
1359 dev->name);
1360 continue;
1361 }
1362
1363 score->rule = -1;
1364 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1365
1366 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1367 int minihiscore, miniscore;
1368
1369 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1370 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1371
1372 if (minihiscore > miniscore) {
1373 if (i == IPV6_SADDR_RULE_SCOPE &&
1374 score->scopedist > 0) {
1375 /*
1376 * special case:
1377 * each remaining entry
1378 * has too small (not enough)
1379 * scope, because ifa entries
1380 * are sorted by their scope
1381 * values.
1382 */
1383 goto try_nextdev;
1384 }
1385 break;
1386 } else if (minihiscore < miniscore) {
1387 if (hiscore->ifa)
1388 in6_ifa_put(hiscore->ifa);
1389
1390 in6_ifa_hold(score->ifa);
1391
1392 swap(hiscore, score);
1393
1394 /* restore our iterator */
1395 score->ifa = hiscore->ifa;
1396
1397 break;
1398 }
1399 }
1400 }
1401 try_nextdev:
1402 read_unlock_bh(&idev->lock);
1403 }
1404 rcu_read_unlock();
1405
1406 if (!hiscore->ifa)
1407 return -EADDRNOTAVAIL;
1408
1409 *saddr = hiscore->ifa->addr;
1410 in6_ifa_put(hiscore->ifa);
1411 return 0;
1412 }
1413 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1414
1415 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1416 unsigned char banned_flags)
1417 {
1418 struct inet6_ifaddr *ifp;
1419 int err = -EADDRNOTAVAIL;
1420
1421 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1422 if (ifp->scope == IFA_LINK &&
1423 !(ifp->flags & banned_flags)) {
1424 *addr = ifp->addr;
1425 err = 0;
1426 break;
1427 }
1428 }
1429 return err;
1430 }
1431
1432 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1433 unsigned char banned_flags)
1434 {
1435 struct inet6_dev *idev;
1436 int err = -EADDRNOTAVAIL;
1437
1438 rcu_read_lock();
1439 idev = __in6_dev_get(dev);
1440 if (idev) {
1441 read_lock_bh(&idev->lock);
1442 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1443 read_unlock_bh(&idev->lock);
1444 }
1445 rcu_read_unlock();
1446 return err;
1447 }
1448
1449 static int ipv6_count_addresses(struct inet6_dev *idev)
1450 {
1451 int cnt = 0;
1452 struct inet6_ifaddr *ifp;
1453
1454 read_lock_bh(&idev->lock);
1455 list_for_each_entry(ifp, &idev->addr_list, if_list)
1456 cnt++;
1457 read_unlock_bh(&idev->lock);
1458 return cnt;
1459 }
1460
1461 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1462 const struct net_device *dev, int strict)
1463 {
1464 struct inet6_ifaddr *ifp;
1465 unsigned int hash = inet6_addr_hash(addr);
1466
1467 rcu_read_lock_bh();
1468 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1469 if (!net_eq(dev_net(ifp->idev->dev), net))
1470 continue;
1471 if (ipv6_addr_equal(&ifp->addr, addr) &&
1472 !(ifp->flags&IFA_F_TENTATIVE) &&
1473 (dev == NULL || ifp->idev->dev == dev ||
1474 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1475 rcu_read_unlock_bh();
1476 return 1;
1477 }
1478 }
1479
1480 rcu_read_unlock_bh();
1481 return 0;
1482 }
1483 EXPORT_SYMBOL(ipv6_chk_addr);
1484
1485 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1486 struct net_device *dev)
1487 {
1488 unsigned int hash = inet6_addr_hash(addr);
1489 struct inet6_ifaddr *ifp;
1490
1491 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1492 if (!net_eq(dev_net(ifp->idev->dev), net))
1493 continue;
1494 if (ipv6_addr_equal(&ifp->addr, addr)) {
1495 if (dev == NULL || ifp->idev->dev == dev)
1496 return true;
1497 }
1498 }
1499 return false;
1500 }
1501
1502 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1503 {
1504 struct inet6_dev *idev;
1505 struct inet6_ifaddr *ifa;
1506 int onlink;
1507
1508 onlink = 0;
1509 rcu_read_lock();
1510 idev = __in6_dev_get(dev);
1511 if (idev) {
1512 read_lock_bh(&idev->lock);
1513 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1514 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1515 ifa->prefix_len);
1516 if (onlink)
1517 break;
1518 }
1519 read_unlock_bh(&idev->lock);
1520 }
1521 rcu_read_unlock();
1522 return onlink;
1523 }
1524 EXPORT_SYMBOL(ipv6_chk_prefix);
1525
1526 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1527 struct net_device *dev, int strict)
1528 {
1529 struct inet6_ifaddr *ifp, *result = NULL;
1530 unsigned int hash = inet6_addr_hash(addr);
1531
1532 rcu_read_lock_bh();
1533 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1534 if (!net_eq(dev_net(ifp->idev->dev), net))
1535 continue;
1536 if (ipv6_addr_equal(&ifp->addr, addr)) {
1537 if (dev == NULL || ifp->idev->dev == dev ||
1538 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1539 result = ifp;
1540 in6_ifa_hold(ifp);
1541 break;
1542 }
1543 }
1544 }
1545 rcu_read_unlock_bh();
1546
1547 return result;
1548 }
1549
1550 /* Gets referenced address, destroys ifaddr */
1551
1552 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1553 {
1554 if (ifp->flags&IFA_F_PERMANENT) {
1555 spin_lock_bh(&ifp->lock);
1556 addrconf_del_dad_timer(ifp);
1557 ifp->flags |= IFA_F_TENTATIVE;
1558 if (dad_failed)
1559 ifp->flags |= IFA_F_DADFAILED;
1560 spin_unlock_bh(&ifp->lock);
1561 if (dad_failed)
1562 ipv6_ifa_notify(0, ifp);
1563 in6_ifa_put(ifp);
1564 #ifdef CONFIG_IPV6_PRIVACY
1565 } else if (ifp->flags&IFA_F_TEMPORARY) {
1566 struct inet6_ifaddr *ifpub;
1567 spin_lock_bh(&ifp->lock);
1568 ifpub = ifp->ifpub;
1569 if (ifpub) {
1570 in6_ifa_hold(ifpub);
1571 spin_unlock_bh(&ifp->lock);
1572 ipv6_create_tempaddr(ifpub, ifp);
1573 in6_ifa_put(ifpub);
1574 } else {
1575 spin_unlock_bh(&ifp->lock);
1576 }
1577 ipv6_del_addr(ifp);
1578 #endif
1579 } else
1580 ipv6_del_addr(ifp);
1581 }
1582
1583 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1584 {
1585 int err = -ENOENT;
1586
1587 spin_lock(&ifp->state_lock);
1588 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1589 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1590 err = 0;
1591 }
1592 spin_unlock(&ifp->state_lock);
1593
1594 return err;
1595 }
1596
1597 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1598 {
1599 struct inet6_dev *idev = ifp->idev;
1600
1601 if (addrconf_dad_end(ifp)) {
1602 in6_ifa_put(ifp);
1603 return;
1604 }
1605
1606 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1607 ifp->idev->dev->name, &ifp->addr);
1608
1609 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1610 struct in6_addr addr;
1611
1612 addr.s6_addr32[0] = htonl(0xfe800000);
1613 addr.s6_addr32[1] = 0;
1614
1615 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1616 ipv6_addr_equal(&ifp->addr, &addr)) {
1617 /* DAD failed for link-local based on MAC address */
1618 idev->cnf.disable_ipv6 = 1;
1619
1620 pr_info("%s: IPv6 being disabled!\n",
1621 ifp->idev->dev->name);
1622 }
1623 }
1624
1625 addrconf_dad_stop(ifp, 1);
1626 }
1627
1628 /* Join to solicited addr multicast group. */
1629
1630 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1631 {
1632 struct in6_addr maddr;
1633
1634 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1635 return;
1636
1637 addrconf_addr_solict_mult(addr, &maddr);
1638 ipv6_dev_mc_inc(dev, &maddr);
1639 }
1640
1641 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1642 {
1643 struct in6_addr maddr;
1644
1645 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1646 return;
1647
1648 addrconf_addr_solict_mult(addr, &maddr);
1649 __ipv6_dev_mc_dec(idev, &maddr);
1650 }
1651
1652 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1653 {
1654 struct in6_addr addr;
1655 if (ifp->prefix_len == 127) /* RFC 6164 */
1656 return;
1657 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1658 if (ipv6_addr_any(&addr))
1659 return;
1660 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1661 }
1662
1663 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1664 {
1665 struct in6_addr addr;
1666 if (ifp->prefix_len == 127) /* RFC 6164 */
1667 return;
1668 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1669 if (ipv6_addr_any(&addr))
1670 return;
1671 __ipv6_dev_ac_dec(ifp->idev, &addr);
1672 }
1673
1674 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1675 {
1676 if (dev->addr_len != ETH_ALEN)
1677 return -1;
1678 memcpy(eui, dev->dev_addr, 3);
1679 memcpy(eui + 5, dev->dev_addr + 3, 3);
1680
1681 /*
1682 * The zSeries OSA network cards can be shared among various
1683 * OS instances, but the OSA cards have only one MAC address.
1684 * This leads to duplicate address conflicts in conjunction
1685 * with IPv6 if more than one instance uses the same card.
1686 *
1687 * The driver for these cards can deliver a unique 16-bit
1688 * identifier for each instance sharing the same card. It is
1689 * placed instead of 0xFFFE in the interface identifier. The
1690 * "u" bit of the interface identifier is not inverted in this
1691 * case. Hence the resulting interface identifier has local
1692 * scope according to RFC2373.
1693 */
1694 if (dev->dev_id) {
1695 eui[3] = (dev->dev_id >> 8) & 0xFF;
1696 eui[4] = dev->dev_id & 0xFF;
1697 } else {
1698 eui[3] = 0xFF;
1699 eui[4] = 0xFE;
1700 eui[0] ^= 2;
1701 }
1702 return 0;
1703 }
1704
1705 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1706 {
1707 if (dev->addr_len != IEEE802154_ADDR_LEN)
1708 return -1;
1709 memcpy(eui, dev->dev_addr, 8);
1710 eui[0] ^= 2;
1711 return 0;
1712 }
1713
1714 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1715 {
1716 union fwnet_hwaddr *ha;
1717
1718 if (dev->addr_len != FWNET_ALEN)
1719 return -1;
1720
1721 ha = (union fwnet_hwaddr *)dev->dev_addr;
1722
1723 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1724 eui[0] ^= 2;
1725 return 0;
1726 }
1727
1728 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1729 {
1730 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1731 if (dev->addr_len != ARCNET_ALEN)
1732 return -1;
1733 memset(eui, 0, 7);
1734 eui[7] = *(u8 *)dev->dev_addr;
1735 return 0;
1736 }
1737
1738 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1739 {
1740 if (dev->addr_len != INFINIBAND_ALEN)
1741 return -1;
1742 memcpy(eui, dev->dev_addr + 12, 8);
1743 eui[0] |= 2;
1744 return 0;
1745 }
1746
1747 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1748 {
1749 if (addr == 0)
1750 return -1;
1751 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1752 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1753 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1754 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1755 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1756 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1757 eui[1] = 0;
1758 eui[2] = 0x5E;
1759 eui[3] = 0xFE;
1760 memcpy(eui + 4, &addr, 4);
1761 return 0;
1762 }
1763
1764 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1765 {
1766 if (dev->priv_flags & IFF_ISATAP)
1767 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1768 return -1;
1769 }
1770
1771 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1772 {
1773 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1774 }
1775
1776 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1777 {
1778 memcpy(eui, dev->perm_addr, 3);
1779 memcpy(eui + 5, dev->perm_addr + 3, 3);
1780 eui[3] = 0xFF;
1781 eui[4] = 0xFE;
1782 eui[0] ^= 2;
1783 return 0;
1784 }
1785
1786 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1787 {
1788 switch (dev->type) {
1789 case ARPHRD_ETHER:
1790 case ARPHRD_FDDI:
1791 return addrconf_ifid_eui48(eui, dev);
1792 case ARPHRD_ARCNET:
1793 return addrconf_ifid_arcnet(eui, dev);
1794 case ARPHRD_INFINIBAND:
1795 return addrconf_ifid_infiniband(eui, dev);
1796 case ARPHRD_SIT:
1797 return addrconf_ifid_sit(eui, dev);
1798 case ARPHRD_IPGRE:
1799 return addrconf_ifid_gre(eui, dev);
1800 case ARPHRD_IEEE802154:
1801 return addrconf_ifid_eui64(eui, dev);
1802 case ARPHRD_IEEE1394:
1803 return addrconf_ifid_ieee1394(eui, dev);
1804 case ARPHRD_TUNNEL6:
1805 return addrconf_ifid_ip6tnl(eui, dev);
1806 }
1807 return -1;
1808 }
1809
1810 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1811 {
1812 int err = -1;
1813 struct inet6_ifaddr *ifp;
1814
1815 read_lock_bh(&idev->lock);
1816 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1817 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1818 memcpy(eui, ifp->addr.s6_addr+8, 8);
1819 err = 0;
1820 break;
1821 }
1822 }
1823 read_unlock_bh(&idev->lock);
1824 return err;
1825 }
1826
1827 #ifdef CONFIG_IPV6_PRIVACY
1828 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1829 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1830 {
1831 regen:
1832 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1833 idev->rndid[0] &= ~0x02;
1834
1835 /*
1836 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1837 * check if generated address is not inappropriate
1838 *
1839 * - Reserved subnet anycast (RFC 2526)
1840 * 11111101 11....11 1xxxxxxx
1841 * - ISATAP (RFC4214) 6.1
1842 * 00-00-5E-FE-xx-xx-xx-xx
1843 * - value 0
1844 * - XXX: already assigned to an address on the device
1845 */
1846 if (idev->rndid[0] == 0xfd &&
1847 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1848 (idev->rndid[7]&0x80))
1849 goto regen;
1850 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1851 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1852 goto regen;
1853 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1854 goto regen;
1855 }
1856 }
1857
1858 static void ipv6_regen_rndid(unsigned long data)
1859 {
1860 struct inet6_dev *idev = (struct inet6_dev *) data;
1861 unsigned long expires;
1862
1863 rcu_read_lock_bh();
1864 write_lock_bh(&idev->lock);
1865
1866 if (idev->dead)
1867 goto out;
1868
1869 __ipv6_regen_rndid(idev);
1870
1871 expires = jiffies +
1872 idev->cnf.temp_prefered_lft * HZ -
1873 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1874 idev->cnf.max_desync_factor * HZ;
1875 if (time_before(expires, jiffies)) {
1876 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1877 __func__, idev->dev->name);
1878 goto out;
1879 }
1880
1881 if (!mod_timer(&idev->regen_timer, expires))
1882 in6_dev_hold(idev);
1883
1884 out:
1885 write_unlock_bh(&idev->lock);
1886 rcu_read_unlock_bh();
1887 in6_dev_put(idev);
1888 }
1889
1890 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1891 {
1892 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1893 __ipv6_regen_rndid(idev);
1894 }
1895 #endif
1896
1897 /*
1898 * Add prefix route.
1899 */
1900
1901 static void
1902 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1903 unsigned long expires, u32 flags)
1904 {
1905 struct fib6_config cfg = {
1906 .fc_table = RT6_TABLE_PREFIX,
1907 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1908 .fc_ifindex = dev->ifindex,
1909 .fc_expires = expires,
1910 .fc_dst_len = plen,
1911 .fc_flags = RTF_UP | flags,
1912 .fc_nlinfo.nl_net = dev_net(dev),
1913 .fc_protocol = RTPROT_KERNEL,
1914 };
1915
1916 cfg.fc_dst = *pfx;
1917
1918 /* Prevent useless cloning on PtP SIT.
1919 This thing is done here expecting that the whole
1920 class of non-broadcast devices need not cloning.
1921 */
1922 #if IS_ENABLED(CONFIG_IPV6_SIT)
1923 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1924 cfg.fc_flags |= RTF_NONEXTHOP;
1925 #endif
1926
1927 ip6_route_add(&cfg);
1928 }
1929
1930
1931 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1932 int plen,
1933 const struct net_device *dev,
1934 u32 flags, u32 noflags)
1935 {
1936 struct fib6_node *fn;
1937 struct rt6_info *rt = NULL;
1938 struct fib6_table *table;
1939
1940 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1941 if (table == NULL)
1942 return NULL;
1943
1944 read_lock_bh(&table->tb6_lock);
1945 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1946 if (!fn)
1947 goto out;
1948 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1949 if (rt->dst.dev->ifindex != dev->ifindex)
1950 continue;
1951 if ((rt->rt6i_flags & flags) != flags)
1952 continue;
1953 if ((rt->rt6i_flags & noflags) != 0)
1954 continue;
1955 dst_hold(&rt->dst);
1956 break;
1957 }
1958 out:
1959 read_unlock_bh(&table->tb6_lock);
1960 return rt;
1961 }
1962
1963
1964 /* Create "default" multicast route to the interface */
1965
1966 static void addrconf_add_mroute(struct net_device *dev)
1967 {
1968 struct fib6_config cfg = {
1969 .fc_table = RT6_TABLE_LOCAL,
1970 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1971 .fc_ifindex = dev->ifindex,
1972 .fc_dst_len = 8,
1973 .fc_flags = RTF_UP,
1974 .fc_nlinfo.nl_net = dev_net(dev),
1975 };
1976
1977 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1978
1979 ip6_route_add(&cfg);
1980 }
1981
1982 #if IS_ENABLED(CONFIG_IPV6_SIT)
1983 static void sit_route_add(struct net_device *dev)
1984 {
1985 struct fib6_config cfg = {
1986 .fc_table = RT6_TABLE_MAIN,
1987 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1988 .fc_ifindex = dev->ifindex,
1989 .fc_dst_len = 96,
1990 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1991 .fc_nlinfo.nl_net = dev_net(dev),
1992 };
1993
1994 /* prefix length - 96 bits "::d.d.d.d" */
1995 ip6_route_add(&cfg);
1996 }
1997 #endif
1998
1999 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2000 {
2001 struct inet6_dev *idev;
2002
2003 ASSERT_RTNL();
2004
2005 idev = ipv6_find_idev(dev);
2006 if (!idev)
2007 return ERR_PTR(-ENOBUFS);
2008
2009 if (idev->cnf.disable_ipv6)
2010 return ERR_PTR(-EACCES);
2011
2012 /* Add default multicast route */
2013 if (!(dev->flags & IFF_LOOPBACK))
2014 addrconf_add_mroute(dev);
2015
2016 return idev;
2017 }
2018
2019 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2020 {
2021 struct prefix_info *pinfo;
2022 __u32 valid_lft;
2023 __u32 prefered_lft;
2024 int addr_type;
2025 struct inet6_dev *in6_dev;
2026 struct net *net = dev_net(dev);
2027
2028 pinfo = (struct prefix_info *) opt;
2029
2030 if (len < sizeof(struct prefix_info)) {
2031 ADBG("addrconf: prefix option too short\n");
2032 return;
2033 }
2034
2035 /*
2036 * Validation checks ([ADDRCONF], page 19)
2037 */
2038
2039 addr_type = ipv6_addr_type(&pinfo->prefix);
2040
2041 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2042 return;
2043
2044 valid_lft = ntohl(pinfo->valid);
2045 prefered_lft = ntohl(pinfo->prefered);
2046
2047 if (prefered_lft > valid_lft) {
2048 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2049 return;
2050 }
2051
2052 in6_dev = in6_dev_get(dev);
2053
2054 if (in6_dev == NULL) {
2055 net_dbg_ratelimited("addrconf: device %s not configured\n",
2056 dev->name);
2057 return;
2058 }
2059
2060 /*
2061 * Two things going on here:
2062 * 1) Add routes for on-link prefixes
2063 * 2) Configure prefixes with the auto flag set
2064 */
2065
2066 if (pinfo->onlink) {
2067 struct rt6_info *rt;
2068 unsigned long rt_expires;
2069
2070 /* Avoid arithmetic overflow. Really, we could
2071 * save rt_expires in seconds, likely valid_lft,
2072 * but it would require division in fib gc, that it
2073 * not good.
2074 */
2075 if (HZ > USER_HZ)
2076 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2077 else
2078 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2079
2080 if (addrconf_finite_timeout(rt_expires))
2081 rt_expires *= HZ;
2082
2083 rt = addrconf_get_prefix_route(&pinfo->prefix,
2084 pinfo->prefix_len,
2085 dev,
2086 RTF_ADDRCONF | RTF_PREFIX_RT,
2087 RTF_GATEWAY | RTF_DEFAULT);
2088
2089 if (rt) {
2090 /* Autoconf prefix route */
2091 if (valid_lft == 0) {
2092 ip6_del_rt(rt);
2093 rt = NULL;
2094 } else if (addrconf_finite_timeout(rt_expires)) {
2095 /* not infinity */
2096 rt6_set_expires(rt, jiffies + rt_expires);
2097 } else {
2098 rt6_clean_expires(rt);
2099 }
2100 } else if (valid_lft) {
2101 clock_t expires = 0;
2102 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2103 if (addrconf_finite_timeout(rt_expires)) {
2104 /* not infinity */
2105 flags |= RTF_EXPIRES;
2106 expires = jiffies_to_clock_t(rt_expires);
2107 }
2108 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2109 dev, expires, flags);
2110 }
2111 ip6_rt_put(rt);
2112 }
2113
2114 /* Try to figure out our local address for this prefix */
2115
2116 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2117 struct inet6_ifaddr *ifp;
2118 struct in6_addr addr;
2119 int create = 0, update_lft = 0;
2120 bool tokenized = false;
2121
2122 if (pinfo->prefix_len == 64) {
2123 memcpy(&addr, &pinfo->prefix, 8);
2124
2125 if (!ipv6_addr_any(&in6_dev->token)) {
2126 read_lock_bh(&in6_dev->lock);
2127 memcpy(addr.s6_addr + 8,
2128 in6_dev->token.s6_addr + 8, 8);
2129 read_unlock_bh(&in6_dev->lock);
2130 tokenized = true;
2131 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2132 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2133 in6_dev_put(in6_dev);
2134 return;
2135 }
2136 goto ok;
2137 }
2138 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2139 pinfo->prefix_len);
2140 in6_dev_put(in6_dev);
2141 return;
2142
2143 ok:
2144
2145 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2146
2147 if (ifp == NULL && valid_lft) {
2148 int max_addresses = in6_dev->cnf.max_addresses;
2149 u32 addr_flags = 0;
2150
2151 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2152 if (in6_dev->cnf.optimistic_dad &&
2153 !net->ipv6.devconf_all->forwarding && sllao)
2154 addr_flags = IFA_F_OPTIMISTIC;
2155 #endif
2156
2157 /* Do not allow to create too much of autoconfigured
2158 * addresses; this would be too easy way to crash kernel.
2159 */
2160 if (!max_addresses ||
2161 ipv6_count_addresses(in6_dev) < max_addresses)
2162 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2163 pinfo->prefix_len,
2164 addr_type&IPV6_ADDR_SCOPE_MASK,
2165 addr_flags, valid_lft,
2166 prefered_lft);
2167
2168 if (IS_ERR_OR_NULL(ifp)) {
2169 in6_dev_put(in6_dev);
2170 return;
2171 }
2172
2173 update_lft = 0;
2174 create = 1;
2175 ifp->cstamp = jiffies;
2176 ifp->tokenized = tokenized;
2177 addrconf_dad_start(ifp);
2178 }
2179
2180 if (ifp) {
2181 int flags;
2182 unsigned long now;
2183 #ifdef CONFIG_IPV6_PRIVACY
2184 struct inet6_ifaddr *ift;
2185 #endif
2186 u32 stored_lft;
2187
2188 /* update lifetime (RFC2462 5.5.3 e) */
2189 spin_lock(&ifp->lock);
2190 now = jiffies;
2191 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2192 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2193 else
2194 stored_lft = 0;
2195 if (!update_lft && !create && stored_lft) {
2196 if (valid_lft > MIN_VALID_LIFETIME ||
2197 valid_lft > stored_lft)
2198 update_lft = 1;
2199 else if (stored_lft <= MIN_VALID_LIFETIME) {
2200 /* valid_lft <= stored_lft is always true */
2201 /*
2202 * RFC 4862 Section 5.5.3e:
2203 * "Note that the preferred lifetime of
2204 * the corresponding address is always
2205 * reset to the Preferred Lifetime in
2206 * the received Prefix Information
2207 * option, regardless of whether the
2208 * valid lifetime is also reset or
2209 * ignored."
2210 *
2211 * So if the preferred lifetime in
2212 * this advertisement is different
2213 * than what we have stored, but the
2214 * valid lifetime is invalid, just
2215 * reset prefered_lft.
2216 *
2217 * We must set the valid lifetime
2218 * to the stored lifetime since we'll
2219 * be updating the timestamp below,
2220 * else we'll set it back to the
2221 * minimum.
2222 */
2223 if (prefered_lft != ifp->prefered_lft) {
2224 valid_lft = stored_lft;
2225 update_lft = 1;
2226 }
2227 } else {
2228 valid_lft = MIN_VALID_LIFETIME;
2229 if (valid_lft < prefered_lft)
2230 prefered_lft = valid_lft;
2231 update_lft = 1;
2232 }
2233 }
2234
2235 if (update_lft) {
2236 ifp->valid_lft = valid_lft;
2237 ifp->prefered_lft = prefered_lft;
2238 ifp->tstamp = now;
2239 flags = ifp->flags;
2240 ifp->flags &= ~IFA_F_DEPRECATED;
2241 spin_unlock(&ifp->lock);
2242
2243 if (!(flags&IFA_F_TENTATIVE))
2244 ipv6_ifa_notify(0, ifp);
2245 } else
2246 spin_unlock(&ifp->lock);
2247
2248 #ifdef CONFIG_IPV6_PRIVACY
2249 read_lock_bh(&in6_dev->lock);
2250 /* update all temporary addresses in the list */
2251 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2252 tmp_list) {
2253 int age, max_valid, max_prefered;
2254
2255 if (ifp != ift->ifpub)
2256 continue;
2257
2258 /*
2259 * RFC 4941 section 3.3:
2260 * If a received option will extend the lifetime
2261 * of a public address, the lifetimes of
2262 * temporary addresses should be extended,
2263 * subject to the overall constraint that no
2264 * temporary addresses should ever remain
2265 * "valid" or "preferred" for a time longer than
2266 * (TEMP_VALID_LIFETIME) or
2267 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2268 * respectively.
2269 */
2270 age = (now - ift->cstamp) / HZ;
2271 max_valid = in6_dev->cnf.temp_valid_lft - age;
2272 if (max_valid < 0)
2273 max_valid = 0;
2274
2275 max_prefered = in6_dev->cnf.temp_prefered_lft -
2276 in6_dev->cnf.max_desync_factor -
2277 age;
2278 if (max_prefered < 0)
2279 max_prefered = 0;
2280
2281 if (valid_lft > max_valid)
2282 valid_lft = max_valid;
2283
2284 if (prefered_lft > max_prefered)
2285 prefered_lft = max_prefered;
2286
2287 spin_lock(&ift->lock);
2288 flags = ift->flags;
2289 ift->valid_lft = valid_lft;
2290 ift->prefered_lft = prefered_lft;
2291 ift->tstamp = now;
2292 if (prefered_lft > 0)
2293 ift->flags &= ~IFA_F_DEPRECATED;
2294
2295 spin_unlock(&ift->lock);
2296 if (!(flags&IFA_F_TENTATIVE))
2297 ipv6_ifa_notify(0, ift);
2298 }
2299
2300 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2301 /*
2302 * When a new public address is created as
2303 * described in [ADDRCONF], also create a new
2304 * temporary address. Also create a temporary
2305 * address if it's enabled but no temporary
2306 * address currently exists.
2307 */
2308 read_unlock_bh(&in6_dev->lock);
2309 ipv6_create_tempaddr(ifp, NULL);
2310 } else {
2311 read_unlock_bh(&in6_dev->lock);
2312 }
2313 #endif
2314 in6_ifa_put(ifp);
2315 addrconf_verify(0);
2316 }
2317 }
2318 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2319 in6_dev_put(in6_dev);
2320 }
2321
2322 /*
2323 * Set destination address.
2324 * Special case for SIT interfaces where we create a new "virtual"
2325 * device.
2326 */
2327 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2328 {
2329 struct in6_ifreq ireq;
2330 struct net_device *dev;
2331 int err = -EINVAL;
2332
2333 rtnl_lock();
2334
2335 err = -EFAULT;
2336 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2337 goto err_exit;
2338
2339 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2340
2341 err = -ENODEV;
2342 if (dev == NULL)
2343 goto err_exit;
2344
2345 #if IS_ENABLED(CONFIG_IPV6_SIT)
2346 if (dev->type == ARPHRD_SIT) {
2347 const struct net_device_ops *ops = dev->netdev_ops;
2348 struct ifreq ifr;
2349 struct ip_tunnel_parm p;
2350
2351 err = -EADDRNOTAVAIL;
2352 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2353 goto err_exit;
2354
2355 memset(&p, 0, sizeof(p));
2356 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2357 p.iph.saddr = 0;
2358 p.iph.version = 4;
2359 p.iph.ihl = 5;
2360 p.iph.protocol = IPPROTO_IPV6;
2361 p.iph.ttl = 64;
2362 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2363
2364 if (ops->ndo_do_ioctl) {
2365 mm_segment_t oldfs = get_fs();
2366
2367 set_fs(KERNEL_DS);
2368 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2369 set_fs(oldfs);
2370 } else
2371 err = -EOPNOTSUPP;
2372
2373 if (err == 0) {
2374 err = -ENOBUFS;
2375 dev = __dev_get_by_name(net, p.name);
2376 if (!dev)
2377 goto err_exit;
2378 err = dev_open(dev);
2379 }
2380 }
2381 #endif
2382
2383 err_exit:
2384 rtnl_unlock();
2385 return err;
2386 }
2387
2388 /*
2389 * Manual configuration of address on an interface
2390 */
2391 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2392 const struct in6_addr *peer_pfx,
2393 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2394 __u32 valid_lft)
2395 {
2396 struct inet6_ifaddr *ifp;
2397 struct inet6_dev *idev;
2398 struct net_device *dev;
2399 int scope;
2400 u32 flags;
2401 clock_t expires;
2402 unsigned long timeout;
2403
2404 ASSERT_RTNL();
2405
2406 if (plen > 128)
2407 return -EINVAL;
2408
2409 /* check the lifetime */
2410 if (!valid_lft || prefered_lft > valid_lft)
2411 return -EINVAL;
2412
2413 dev = __dev_get_by_index(net, ifindex);
2414 if (!dev)
2415 return -ENODEV;
2416
2417 idev = addrconf_add_dev(dev);
2418 if (IS_ERR(idev))
2419 return PTR_ERR(idev);
2420
2421 scope = ipv6_addr_scope(pfx);
2422
2423 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2424 if (addrconf_finite_timeout(timeout)) {
2425 expires = jiffies_to_clock_t(timeout * HZ);
2426 valid_lft = timeout;
2427 flags = RTF_EXPIRES;
2428 } else {
2429 expires = 0;
2430 flags = 0;
2431 ifa_flags |= IFA_F_PERMANENT;
2432 }
2433
2434 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2435 if (addrconf_finite_timeout(timeout)) {
2436 if (timeout == 0)
2437 ifa_flags |= IFA_F_DEPRECATED;
2438 prefered_lft = timeout;
2439 }
2440
2441 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2442 valid_lft, prefered_lft);
2443
2444 if (!IS_ERR(ifp)) {
2445 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2446 expires, flags);
2447 /*
2448 * Note that section 3.1 of RFC 4429 indicates
2449 * that the Optimistic flag should not be set for
2450 * manually configured addresses
2451 */
2452 addrconf_dad_start(ifp);
2453 in6_ifa_put(ifp);
2454 addrconf_verify(0);
2455 return 0;
2456 }
2457
2458 return PTR_ERR(ifp);
2459 }
2460
2461 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2462 unsigned int plen)
2463 {
2464 struct inet6_ifaddr *ifp;
2465 struct inet6_dev *idev;
2466 struct net_device *dev;
2467
2468 if (plen > 128)
2469 return -EINVAL;
2470
2471 dev = __dev_get_by_index(net, ifindex);
2472 if (!dev)
2473 return -ENODEV;
2474
2475 if ((idev = __in6_dev_get(dev)) == NULL)
2476 return -ENXIO;
2477
2478 read_lock_bh(&idev->lock);
2479 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2480 if (ifp->prefix_len == plen &&
2481 ipv6_addr_equal(pfx, &ifp->addr)) {
2482 in6_ifa_hold(ifp);
2483 read_unlock_bh(&idev->lock);
2484
2485 ipv6_del_addr(ifp);
2486 return 0;
2487 }
2488 }
2489 read_unlock_bh(&idev->lock);
2490 return -EADDRNOTAVAIL;
2491 }
2492
2493
2494 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2495 {
2496 struct in6_ifreq ireq;
2497 int err;
2498
2499 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2500 return -EPERM;
2501
2502 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2503 return -EFAULT;
2504
2505 rtnl_lock();
2506 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2507 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2508 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2509 rtnl_unlock();
2510 return err;
2511 }
2512
2513 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2514 {
2515 struct in6_ifreq ireq;
2516 int err;
2517
2518 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2519 return -EPERM;
2520
2521 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2522 return -EFAULT;
2523
2524 rtnl_lock();
2525 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2526 ireq.ifr6_prefixlen);
2527 rtnl_unlock();
2528 return err;
2529 }
2530
2531 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2532 int plen, int scope)
2533 {
2534 struct inet6_ifaddr *ifp;
2535
2536 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2537 scope, IFA_F_PERMANENT, 0, 0);
2538 if (!IS_ERR(ifp)) {
2539 spin_lock_bh(&ifp->lock);
2540 ifp->flags &= ~IFA_F_TENTATIVE;
2541 spin_unlock_bh(&ifp->lock);
2542 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2543 in6_ifa_put(ifp);
2544 }
2545 }
2546
2547 #if IS_ENABLED(CONFIG_IPV6_SIT)
2548 static void sit_add_v4_addrs(struct inet6_dev *idev)
2549 {
2550 struct in6_addr addr;
2551 struct net_device *dev;
2552 struct net *net = dev_net(idev->dev);
2553 int scope;
2554
2555 ASSERT_RTNL();
2556
2557 memset(&addr, 0, sizeof(struct in6_addr));
2558 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2559
2560 if (idev->dev->flags&IFF_POINTOPOINT) {
2561 addr.s6_addr32[0] = htonl(0xfe800000);
2562 scope = IFA_LINK;
2563 } else {
2564 scope = IPV6_ADDR_COMPATv4;
2565 }
2566
2567 if (addr.s6_addr32[3]) {
2568 add_addr(idev, &addr, 128, scope);
2569 return;
2570 }
2571
2572 for_each_netdev(net, dev) {
2573 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2574 if (in_dev && (dev->flags & IFF_UP)) {
2575 struct in_ifaddr *ifa;
2576
2577 int flag = scope;
2578
2579 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2580 int plen;
2581
2582 addr.s6_addr32[3] = ifa->ifa_local;
2583
2584 if (ifa->ifa_scope == RT_SCOPE_LINK)
2585 continue;
2586 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2587 if (idev->dev->flags&IFF_POINTOPOINT)
2588 continue;
2589 flag |= IFA_HOST;
2590 }
2591 if (idev->dev->flags&IFF_POINTOPOINT)
2592 plen = 64;
2593 else
2594 plen = 96;
2595
2596 add_addr(idev, &addr, plen, flag);
2597 }
2598 }
2599 }
2600 }
2601 #endif
2602
2603 static void init_loopback(struct net_device *dev)
2604 {
2605 struct inet6_dev *idev;
2606 struct net_device *sp_dev;
2607 struct inet6_ifaddr *sp_ifa;
2608 struct rt6_info *sp_rt;
2609
2610 /* ::1 */
2611
2612 ASSERT_RTNL();
2613
2614 if ((idev = ipv6_find_idev(dev)) == NULL) {
2615 pr_debug("%s: add_dev failed\n", __func__);
2616 return;
2617 }
2618
2619 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2620
2621 /* Add routes to other interface's IPv6 addresses */
2622 for_each_netdev(dev_net(dev), sp_dev) {
2623 if (!strcmp(sp_dev->name, dev->name))
2624 continue;
2625
2626 idev = __in6_dev_get(sp_dev);
2627 if (!idev)
2628 continue;
2629
2630 read_lock_bh(&idev->lock);
2631 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2632
2633 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2634 continue;
2635
2636 if (sp_ifa->rt)
2637 continue;
2638
2639 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2640
2641 /* Failure cases are ignored */
2642 if (!IS_ERR(sp_rt)) {
2643 sp_ifa->rt = sp_rt;
2644 ip6_ins_rt(sp_rt);
2645 }
2646 }
2647 read_unlock_bh(&idev->lock);
2648 }
2649 }
2650
2651 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2652 {
2653 struct inet6_ifaddr *ifp;
2654 u32 addr_flags = IFA_F_PERMANENT;
2655
2656 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2657 if (idev->cnf.optimistic_dad &&
2658 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2659 addr_flags |= IFA_F_OPTIMISTIC;
2660 #endif
2661
2662
2663 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0);
2664 if (!IS_ERR(ifp)) {
2665 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2666 addrconf_dad_start(ifp);
2667 in6_ifa_put(ifp);
2668 }
2669 }
2670
2671 static void addrconf_dev_config(struct net_device *dev)
2672 {
2673 struct in6_addr addr;
2674 struct inet6_dev *idev;
2675
2676 ASSERT_RTNL();
2677
2678 if ((dev->type != ARPHRD_ETHER) &&
2679 (dev->type != ARPHRD_FDDI) &&
2680 (dev->type != ARPHRD_ARCNET) &&
2681 (dev->type != ARPHRD_INFINIBAND) &&
2682 (dev->type != ARPHRD_IEEE802154) &&
2683 (dev->type != ARPHRD_IEEE1394) &&
2684 (dev->type != ARPHRD_TUNNEL6)) {
2685 /* Alas, we support only Ethernet autoconfiguration. */
2686 return;
2687 }
2688
2689 idev = addrconf_add_dev(dev);
2690 if (IS_ERR(idev))
2691 return;
2692
2693 memset(&addr, 0, sizeof(struct in6_addr));
2694 addr.s6_addr32[0] = htonl(0xFE800000);
2695
2696 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2697 addrconf_add_linklocal(idev, &addr);
2698 }
2699
2700 #if IS_ENABLED(CONFIG_IPV6_SIT)
2701 static void addrconf_sit_config(struct net_device *dev)
2702 {
2703 struct inet6_dev *idev;
2704
2705 ASSERT_RTNL();
2706
2707 /*
2708 * Configure the tunnel with one of our IPv4
2709 * addresses... we should configure all of
2710 * our v4 addrs in the tunnel
2711 */
2712
2713 if ((idev = ipv6_find_idev(dev)) == NULL) {
2714 pr_debug("%s: add_dev failed\n", __func__);
2715 return;
2716 }
2717
2718 if (dev->priv_flags & IFF_ISATAP) {
2719 struct in6_addr addr;
2720
2721 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2722 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2723 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2724 addrconf_add_linklocal(idev, &addr);
2725 return;
2726 }
2727
2728 sit_add_v4_addrs(idev);
2729
2730 if (dev->flags&IFF_POINTOPOINT)
2731 addrconf_add_mroute(dev);
2732 else
2733 sit_route_add(dev);
2734 }
2735 #endif
2736
2737 #if IS_ENABLED(CONFIG_NET_IPGRE)
2738 static void addrconf_gre_config(struct net_device *dev)
2739 {
2740 struct inet6_dev *idev;
2741 struct in6_addr addr;
2742
2743 ASSERT_RTNL();
2744
2745 if ((idev = ipv6_find_idev(dev)) == NULL) {
2746 pr_debug("%s: add_dev failed\n", __func__);
2747 return;
2748 }
2749
2750 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2751 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2752
2753 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2754 addrconf_add_linklocal(idev, &addr);
2755 }
2756 #endif
2757
2758 static inline int
2759 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2760 {
2761 struct in6_addr lladdr;
2762
2763 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2764 addrconf_add_linklocal(idev, &lladdr);
2765 return 0;
2766 }
2767 return -1;
2768 }
2769
2770 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2771 void *ptr)
2772 {
2773 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2774 struct inet6_dev *idev = __in6_dev_get(dev);
2775 int run_pending = 0;
2776 int err;
2777
2778 switch (event) {
2779 case NETDEV_REGISTER:
2780 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2781 idev = ipv6_add_dev(dev);
2782 if (!idev)
2783 return notifier_from_errno(-ENOMEM);
2784 }
2785 break;
2786
2787 case NETDEV_UP:
2788 case NETDEV_CHANGE:
2789 if (dev->flags & IFF_SLAVE)
2790 break;
2791
2792 if (event == NETDEV_UP) {
2793 if (!addrconf_qdisc_ok(dev)) {
2794 /* device is not ready yet. */
2795 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2796 dev->name);
2797 break;
2798 }
2799
2800 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2801 idev = ipv6_add_dev(dev);
2802
2803 if (idev) {
2804 idev->if_flags |= IF_READY;
2805 run_pending = 1;
2806 }
2807 } else {
2808 if (!addrconf_qdisc_ok(dev)) {
2809 /* device is still not ready. */
2810 break;
2811 }
2812
2813 if (idev) {
2814 if (idev->if_flags & IF_READY)
2815 /* device is already configured. */
2816 break;
2817 idev->if_flags |= IF_READY;
2818 }
2819
2820 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2821 dev->name);
2822
2823 run_pending = 1;
2824 }
2825
2826 switch (dev->type) {
2827 #if IS_ENABLED(CONFIG_IPV6_SIT)
2828 case ARPHRD_SIT:
2829 addrconf_sit_config(dev);
2830 break;
2831 #endif
2832 #if IS_ENABLED(CONFIG_NET_IPGRE)
2833 case ARPHRD_IPGRE:
2834 addrconf_gre_config(dev);
2835 break;
2836 #endif
2837 case ARPHRD_LOOPBACK:
2838 init_loopback(dev);
2839 break;
2840
2841 default:
2842 addrconf_dev_config(dev);
2843 break;
2844 }
2845
2846 if (idev) {
2847 if (run_pending)
2848 addrconf_dad_run(idev);
2849
2850 /*
2851 * If the MTU changed during the interface down,
2852 * when the interface up, the changed MTU must be
2853 * reflected in the idev as well as routers.
2854 */
2855 if (idev->cnf.mtu6 != dev->mtu &&
2856 dev->mtu >= IPV6_MIN_MTU) {
2857 rt6_mtu_change(dev, dev->mtu);
2858 idev->cnf.mtu6 = dev->mtu;
2859 }
2860 idev->tstamp = jiffies;
2861 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2862
2863 /*
2864 * If the changed mtu during down is lower than
2865 * IPV6_MIN_MTU stop IPv6 on this interface.
2866 */
2867 if (dev->mtu < IPV6_MIN_MTU)
2868 addrconf_ifdown(dev, 1);
2869 }
2870 break;
2871
2872 case NETDEV_CHANGEMTU:
2873 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2874 rt6_mtu_change(dev, dev->mtu);
2875 idev->cnf.mtu6 = dev->mtu;
2876 break;
2877 }
2878
2879 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2880 idev = ipv6_add_dev(dev);
2881 if (idev)
2882 break;
2883 }
2884
2885 /*
2886 * MTU falled under IPV6_MIN_MTU.
2887 * Stop IPv6 on this interface.
2888 */
2889
2890 case NETDEV_DOWN:
2891 case NETDEV_UNREGISTER:
2892 /*
2893 * Remove all addresses from this interface.
2894 */
2895 addrconf_ifdown(dev, event != NETDEV_DOWN);
2896 break;
2897
2898 case NETDEV_CHANGENAME:
2899 if (idev) {
2900 snmp6_unregister_dev(idev);
2901 addrconf_sysctl_unregister(idev);
2902 addrconf_sysctl_register(idev);
2903 err = snmp6_register_dev(idev);
2904 if (err)
2905 return notifier_from_errno(err);
2906 }
2907 break;
2908
2909 case NETDEV_PRE_TYPE_CHANGE:
2910 case NETDEV_POST_TYPE_CHANGE:
2911 addrconf_type_change(dev, event);
2912 break;
2913 }
2914
2915 return NOTIFY_OK;
2916 }
2917
2918 /*
2919 * addrconf module should be notified of a device going up
2920 */
2921 static struct notifier_block ipv6_dev_notf = {
2922 .notifier_call = addrconf_notify,
2923 };
2924
2925 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2926 {
2927 struct inet6_dev *idev;
2928 ASSERT_RTNL();
2929
2930 idev = __in6_dev_get(dev);
2931
2932 if (event == NETDEV_POST_TYPE_CHANGE)
2933 ipv6_mc_remap(idev);
2934 else if (event == NETDEV_PRE_TYPE_CHANGE)
2935 ipv6_mc_unmap(idev);
2936 }
2937
2938 static int addrconf_ifdown(struct net_device *dev, int how)
2939 {
2940 struct net *net = dev_net(dev);
2941 struct inet6_dev *idev;
2942 struct inet6_ifaddr *ifa;
2943 int state, i;
2944
2945 ASSERT_RTNL();
2946
2947 rt6_ifdown(net, dev);
2948 neigh_ifdown(&nd_tbl, dev);
2949
2950 idev = __in6_dev_get(dev);
2951 if (idev == NULL)
2952 return -ENODEV;
2953
2954 /*
2955 * Step 1: remove reference to ipv6 device from parent device.
2956 * Do not dev_put!
2957 */
2958 if (how) {
2959 idev->dead = 1;
2960
2961 /* protected by rtnl_lock */
2962 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2963
2964 /* Step 1.5: remove snmp6 entry */
2965 snmp6_unregister_dev(idev);
2966
2967 }
2968
2969 /* Step 2: clear hash table */
2970 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2971 struct hlist_head *h = &inet6_addr_lst[i];
2972
2973 spin_lock_bh(&addrconf_hash_lock);
2974 restart:
2975 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
2976 if (ifa->idev == idev) {
2977 hlist_del_init_rcu(&ifa->addr_lst);
2978 addrconf_del_dad_timer(ifa);
2979 goto restart;
2980 }
2981 }
2982 spin_unlock_bh(&addrconf_hash_lock);
2983 }
2984
2985 write_lock_bh(&idev->lock);
2986
2987 addrconf_del_rs_timer(idev);
2988
2989 /* Step 2: clear flags for stateless addrconf */
2990 if (!how)
2991 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2992
2993 #ifdef CONFIG_IPV6_PRIVACY
2994 if (how && del_timer(&idev->regen_timer))
2995 in6_dev_put(idev);
2996
2997 /* Step 3: clear tempaddr list */
2998 while (!list_empty(&idev->tempaddr_list)) {
2999 ifa = list_first_entry(&idev->tempaddr_list,
3000 struct inet6_ifaddr, tmp_list);
3001 list_del(&ifa->tmp_list);
3002 write_unlock_bh(&idev->lock);
3003 spin_lock_bh(&ifa->lock);
3004
3005 if (ifa->ifpub) {
3006 in6_ifa_put(ifa->ifpub);
3007 ifa->ifpub = NULL;
3008 }
3009 spin_unlock_bh(&ifa->lock);
3010 in6_ifa_put(ifa);
3011 write_lock_bh(&idev->lock);
3012 }
3013 #endif
3014
3015 while (!list_empty(&idev->addr_list)) {
3016 ifa = list_first_entry(&idev->addr_list,
3017 struct inet6_ifaddr, if_list);
3018 addrconf_del_dad_timer(ifa);
3019
3020 list_del(&ifa->if_list);
3021
3022 write_unlock_bh(&idev->lock);
3023
3024 spin_lock_bh(&ifa->state_lock);
3025 state = ifa->state;
3026 ifa->state = INET6_IFADDR_STATE_DEAD;
3027 spin_unlock_bh(&ifa->state_lock);
3028
3029 if (state != INET6_IFADDR_STATE_DEAD) {
3030 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3031 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3032 }
3033 in6_ifa_put(ifa);
3034
3035 write_lock_bh(&idev->lock);
3036 }
3037
3038 write_unlock_bh(&idev->lock);
3039
3040 /* Step 5: Discard multicast list */
3041 if (how)
3042 ipv6_mc_destroy_dev(idev);
3043 else
3044 ipv6_mc_down(idev);
3045
3046 idev->tstamp = jiffies;
3047
3048 /* Last: Shot the device (if unregistered) */
3049 if (how) {
3050 addrconf_sysctl_unregister(idev);
3051 neigh_parms_release(&nd_tbl, idev->nd_parms);
3052 neigh_ifdown(&nd_tbl, dev);
3053 in6_dev_put(idev);
3054 }
3055 return 0;
3056 }
3057
3058 static void addrconf_rs_timer(unsigned long data)
3059 {
3060 struct inet6_dev *idev = (struct inet6_dev *)data;
3061 struct net_device *dev = idev->dev;
3062 struct in6_addr lladdr;
3063
3064 write_lock(&idev->lock);
3065 if (idev->dead || !(idev->if_flags & IF_READY))
3066 goto out;
3067
3068 if (!ipv6_accept_ra(idev))
3069 goto out;
3070
3071 /* Announcement received after solicitation was sent */
3072 if (idev->if_flags & IF_RA_RCVD)
3073 goto out;
3074
3075 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3076 write_unlock(&idev->lock);
3077 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3078 ndisc_send_rs(dev, &lladdr,
3079 &in6addr_linklocal_allrouters);
3080 else
3081 goto put;
3082
3083 write_lock(&idev->lock);
3084 /* The wait after the last probe can be shorter */
3085 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3086 idev->cnf.rtr_solicits) ?
3087 idev->cnf.rtr_solicit_delay :
3088 idev->cnf.rtr_solicit_interval);
3089 } else {
3090 /*
3091 * Note: we do not support deprecated "all on-link"
3092 * assumption any longer.
3093 */
3094 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3095 }
3096
3097 out:
3098 write_unlock(&idev->lock);
3099 put:
3100 in6_dev_put(idev);
3101 }
3102
3103 /*
3104 * Duplicate Address Detection
3105 */
3106 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3107 {
3108 unsigned long rand_num;
3109 struct inet6_dev *idev = ifp->idev;
3110
3111 if (ifp->flags & IFA_F_OPTIMISTIC)
3112 rand_num = 0;
3113 else
3114 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3115
3116 ifp->dad_probes = idev->cnf.dad_transmits;
3117 addrconf_mod_dad_timer(ifp, rand_num);
3118 }
3119
3120 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3121 {
3122 struct inet6_dev *idev = ifp->idev;
3123 struct net_device *dev = idev->dev;
3124
3125 addrconf_join_solict(dev, &ifp->addr);
3126
3127 net_srandom(ifp->addr.s6_addr32[3]);
3128
3129 read_lock_bh(&idev->lock);
3130 spin_lock(&ifp->lock);
3131 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3132 goto out;
3133
3134 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3135 idev->cnf.accept_dad < 1 ||
3136 !(ifp->flags&IFA_F_TENTATIVE) ||
3137 ifp->flags & IFA_F_NODAD) {
3138 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3139 spin_unlock(&ifp->lock);
3140 read_unlock_bh(&idev->lock);
3141
3142 addrconf_dad_completed(ifp);
3143 return;
3144 }
3145
3146 if (!(idev->if_flags & IF_READY)) {
3147 spin_unlock(&ifp->lock);
3148 read_unlock_bh(&idev->lock);
3149 /*
3150 * If the device is not ready:
3151 * - keep it tentative if it is a permanent address.
3152 * - otherwise, kill it.
3153 */
3154 in6_ifa_hold(ifp);
3155 addrconf_dad_stop(ifp, 0);
3156 return;
3157 }
3158
3159 /*
3160 * Optimistic nodes can start receiving
3161 * Frames right away
3162 */
3163 if (ifp->flags & IFA_F_OPTIMISTIC)
3164 ip6_ins_rt(ifp->rt);
3165
3166 addrconf_dad_kick(ifp);
3167 out:
3168 spin_unlock(&ifp->lock);
3169 read_unlock_bh(&idev->lock);
3170 }
3171
3172 static void addrconf_dad_timer(unsigned long data)
3173 {
3174 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3175 struct inet6_dev *idev = ifp->idev;
3176 struct in6_addr mcaddr;
3177
3178 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3179 goto out;
3180
3181 write_lock(&idev->lock);
3182 if (idev->dead || !(idev->if_flags & IF_READY)) {
3183 write_unlock(&idev->lock);
3184 goto out;
3185 }
3186
3187 spin_lock(&ifp->lock);
3188 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3189 spin_unlock(&ifp->lock);
3190 write_unlock(&idev->lock);
3191 goto out;
3192 }
3193
3194 if (ifp->dad_probes == 0) {
3195 /*
3196 * DAD was successful
3197 */
3198
3199 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3200 spin_unlock(&ifp->lock);
3201 write_unlock(&idev->lock);
3202
3203 addrconf_dad_completed(ifp);
3204
3205 goto out;
3206 }
3207
3208 ifp->dad_probes--;
3209 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
3210 spin_unlock(&ifp->lock);
3211 write_unlock(&idev->lock);
3212
3213 /* send a neighbour solicitation for our addr */
3214 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3215 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3216 out:
3217 in6_ifa_put(ifp);
3218 }
3219
3220 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3221 {
3222 struct net_device *dev = ifp->idev->dev;
3223 struct in6_addr lladdr;
3224 bool send_rs, send_mld;
3225
3226 addrconf_del_dad_timer(ifp);
3227
3228 /*
3229 * Configure the address for reception. Now it is valid.
3230 */
3231
3232 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3233
3234 /* If added prefix is link local and we are prepared to process
3235 router advertisements, start sending router solicitations.
3236 */
3237
3238 read_lock_bh(&ifp->idev->lock);
3239 spin_lock(&ifp->lock);
3240 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3241 ifp->idev->valid_ll_addr_cnt == 1;
3242 send_rs = send_mld &&
3243 ipv6_accept_ra(ifp->idev) &&
3244 ifp->idev->cnf.rtr_solicits > 0 &&
3245 (dev->flags&IFF_LOOPBACK) == 0;
3246 spin_unlock(&ifp->lock);
3247 read_unlock_bh(&ifp->idev->lock);
3248
3249 /* While dad is in progress mld report's source address is in6_addrany.
3250 * Resend with proper ll now.
3251 */
3252 if (send_mld)
3253 ipv6_mc_dad_complete(ifp->idev);
3254
3255 if (send_rs) {
3256 /*
3257 * If a host as already performed a random delay
3258 * [...] as part of DAD [...] there is no need
3259 * to delay again before sending the first RS
3260 */
3261 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3262 return;
3263 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3264
3265 write_lock_bh(&ifp->idev->lock);
3266 spin_lock(&ifp->lock);
3267 ifp->idev->rs_probes = 1;
3268 ifp->idev->if_flags |= IF_RS_SENT;
3269 addrconf_mod_rs_timer(ifp->idev,
3270 ifp->idev->cnf.rtr_solicit_interval);
3271 spin_unlock(&ifp->lock);
3272 write_unlock_bh(&ifp->idev->lock);
3273 }
3274 }
3275
3276 static void addrconf_dad_run(struct inet6_dev *idev)
3277 {
3278 struct inet6_ifaddr *ifp;
3279
3280 read_lock_bh(&idev->lock);
3281 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3282 spin_lock(&ifp->lock);
3283 if (ifp->flags & IFA_F_TENTATIVE &&
3284 ifp->state == INET6_IFADDR_STATE_DAD)
3285 addrconf_dad_kick(ifp);
3286 spin_unlock(&ifp->lock);
3287 }
3288 read_unlock_bh(&idev->lock);
3289 }
3290
3291 #ifdef CONFIG_PROC_FS
3292 struct if6_iter_state {
3293 struct seq_net_private p;
3294 int bucket;
3295 int offset;
3296 };
3297
3298 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3299 {
3300 struct inet6_ifaddr *ifa = NULL;
3301 struct if6_iter_state *state = seq->private;
3302 struct net *net = seq_file_net(seq);
3303 int p = 0;
3304
3305 /* initial bucket if pos is 0 */
3306 if (pos == 0) {
3307 state->bucket = 0;
3308 state->offset = 0;
3309 }
3310
3311 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3312 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3313 addr_lst) {
3314 if (!net_eq(dev_net(ifa->idev->dev), net))
3315 continue;
3316 /* sync with offset */
3317 if (p < state->offset) {
3318 p++;
3319 continue;
3320 }
3321 state->offset++;
3322 return ifa;
3323 }
3324
3325 /* prepare for next bucket */
3326 state->offset = 0;
3327 p = 0;
3328 }
3329 return NULL;
3330 }
3331
3332 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3333 struct inet6_ifaddr *ifa)
3334 {
3335 struct if6_iter_state *state = seq->private;
3336 struct net *net = seq_file_net(seq);
3337
3338 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3339 if (!net_eq(dev_net(ifa->idev->dev), net))
3340 continue;
3341 state->offset++;
3342 return ifa;
3343 }
3344
3345 while (++state->bucket < IN6_ADDR_HSIZE) {
3346 state->offset = 0;
3347 hlist_for_each_entry_rcu_bh(ifa,
3348 &inet6_addr_lst[state->bucket], addr_lst) {
3349 if (!net_eq(dev_net(ifa->idev->dev), net))
3350 continue;
3351 state->offset++;
3352 return ifa;
3353 }
3354 }
3355
3356 return NULL;
3357 }
3358
3359 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3360 __acquires(rcu_bh)
3361 {
3362 rcu_read_lock_bh();
3363 return if6_get_first(seq, *pos);
3364 }
3365
3366 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3367 {
3368 struct inet6_ifaddr *ifa;
3369
3370 ifa = if6_get_next(seq, v);
3371 ++*pos;
3372 return ifa;
3373 }
3374
3375 static void if6_seq_stop(struct seq_file *seq, void *v)
3376 __releases(rcu_bh)
3377 {
3378 rcu_read_unlock_bh();
3379 }
3380
3381 static int if6_seq_show(struct seq_file *seq, void *v)
3382 {
3383 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3384 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3385 &ifp->addr,
3386 ifp->idev->dev->ifindex,
3387 ifp->prefix_len,
3388 ifp->scope,
3389 ifp->flags,
3390 ifp->idev->dev->name);
3391 return 0;
3392 }
3393
3394 static const struct seq_operations if6_seq_ops = {
3395 .start = if6_seq_start,
3396 .next = if6_seq_next,
3397 .show = if6_seq_show,
3398 .stop = if6_seq_stop,
3399 };
3400
3401 static int if6_seq_open(struct inode *inode, struct file *file)
3402 {
3403 return seq_open_net(inode, file, &if6_seq_ops,
3404 sizeof(struct if6_iter_state));
3405 }
3406
3407 static const struct file_operations if6_fops = {
3408 .owner = THIS_MODULE,
3409 .open = if6_seq_open,
3410 .read = seq_read,
3411 .llseek = seq_lseek,
3412 .release = seq_release_net,
3413 };
3414
3415 static int __net_init if6_proc_net_init(struct net *net)
3416 {
3417 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3418 return -ENOMEM;
3419 return 0;
3420 }
3421
3422 static void __net_exit if6_proc_net_exit(struct net *net)
3423 {
3424 remove_proc_entry("if_inet6", net->proc_net);
3425 }
3426
3427 static struct pernet_operations if6_proc_net_ops = {
3428 .init = if6_proc_net_init,
3429 .exit = if6_proc_net_exit,
3430 };
3431
3432 int __init if6_proc_init(void)
3433 {
3434 return register_pernet_subsys(&if6_proc_net_ops);
3435 }
3436
3437 void if6_proc_exit(void)
3438 {
3439 unregister_pernet_subsys(&if6_proc_net_ops);
3440 }
3441 #endif /* CONFIG_PROC_FS */
3442
3443 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3444 /* Check if address is a home address configured on any interface. */
3445 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3446 {
3447 int ret = 0;
3448 struct inet6_ifaddr *ifp = NULL;
3449 unsigned int hash = inet6_addr_hash(addr);
3450
3451 rcu_read_lock_bh();
3452 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3453 if (!net_eq(dev_net(ifp->idev->dev), net))
3454 continue;
3455 if (ipv6_addr_equal(&ifp->addr, addr) &&
3456 (ifp->flags & IFA_F_HOMEADDRESS)) {
3457 ret = 1;
3458 break;
3459 }
3460 }
3461 rcu_read_unlock_bh();
3462 return ret;
3463 }
3464 #endif
3465
3466 /*
3467 * Periodic address status verification
3468 */
3469
3470 static void addrconf_verify(unsigned long foo)
3471 {
3472 unsigned long now, next, next_sec, next_sched;
3473 struct inet6_ifaddr *ifp;
3474 int i;
3475
3476 rcu_read_lock_bh();
3477 spin_lock(&addrconf_verify_lock);
3478 now = jiffies;
3479 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3480
3481 del_timer(&addr_chk_timer);
3482
3483 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3484 restart:
3485 hlist_for_each_entry_rcu_bh(ifp,
3486 &inet6_addr_lst[i], addr_lst) {
3487 unsigned long age;
3488
3489 if (ifp->flags & IFA_F_PERMANENT)
3490 continue;
3491
3492 spin_lock(&ifp->lock);
3493 /* We try to batch several events at once. */
3494 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3495
3496 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3497 age >= ifp->valid_lft) {
3498 spin_unlock(&ifp->lock);
3499 in6_ifa_hold(ifp);
3500 ipv6_del_addr(ifp);
3501 goto restart;
3502 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3503 spin_unlock(&ifp->lock);
3504 continue;
3505 } else if (age >= ifp->prefered_lft) {
3506 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3507 int deprecate = 0;
3508
3509 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3510 deprecate = 1;
3511 ifp->flags |= IFA_F_DEPRECATED;
3512 }
3513
3514 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3515 next = ifp->tstamp + ifp->valid_lft * HZ;
3516
3517 spin_unlock(&ifp->lock);
3518
3519 if (deprecate) {
3520 in6_ifa_hold(ifp);
3521
3522 ipv6_ifa_notify(0, ifp);
3523 in6_ifa_put(ifp);
3524 goto restart;
3525 }
3526 #ifdef CONFIG_IPV6_PRIVACY
3527 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3528 !(ifp->flags&IFA_F_TENTATIVE)) {
3529 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3530 ifp->idev->cnf.dad_transmits *
3531 ifp->idev->nd_parms->retrans_time / HZ;
3532
3533 if (age >= ifp->prefered_lft - regen_advance) {
3534 struct inet6_ifaddr *ifpub = ifp->ifpub;
3535 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3536 next = ifp->tstamp + ifp->prefered_lft * HZ;
3537 if (!ifp->regen_count && ifpub) {
3538 ifp->regen_count++;
3539 in6_ifa_hold(ifp);
3540 in6_ifa_hold(ifpub);
3541 spin_unlock(&ifp->lock);
3542
3543 spin_lock(&ifpub->lock);
3544 ifpub->regen_count = 0;
3545 spin_unlock(&ifpub->lock);
3546 ipv6_create_tempaddr(ifpub, ifp);
3547 in6_ifa_put(ifpub);
3548 in6_ifa_put(ifp);
3549 goto restart;
3550 }
3551 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3552 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3553 spin_unlock(&ifp->lock);
3554 #endif
3555 } else {
3556 /* ifp->prefered_lft <= ifp->valid_lft */
3557 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3558 next = ifp->tstamp + ifp->prefered_lft * HZ;
3559 spin_unlock(&ifp->lock);
3560 }
3561 }
3562 }
3563
3564 next_sec = round_jiffies_up(next);
3565 next_sched = next;
3566
3567 /* If rounded timeout is accurate enough, accept it. */
3568 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3569 next_sched = next_sec;
3570
3571 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3572 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3573 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3574
3575 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3576 now, next, next_sec, next_sched);
3577
3578 addr_chk_timer.expires = next_sched;
3579 add_timer(&addr_chk_timer);
3580 spin_unlock(&addrconf_verify_lock);
3581 rcu_read_unlock_bh();
3582 }
3583
3584 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3585 struct in6_addr **peer_pfx)
3586 {
3587 struct in6_addr *pfx = NULL;
3588
3589 *peer_pfx = NULL;
3590
3591 if (addr)
3592 pfx = nla_data(addr);
3593
3594 if (local) {
3595 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3596 *peer_pfx = pfx;
3597 pfx = nla_data(local);
3598 }
3599
3600 return pfx;
3601 }
3602
3603 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3604 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3605 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3606 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3607 };
3608
3609 static int
3610 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3611 {
3612 struct net *net = sock_net(skb->sk);
3613 struct ifaddrmsg *ifm;
3614 struct nlattr *tb[IFA_MAX+1];
3615 struct in6_addr *pfx, *peer_pfx;
3616 int err;
3617
3618 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3619 if (err < 0)
3620 return err;
3621
3622 ifm = nlmsg_data(nlh);
3623 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3624 if (pfx == NULL)
3625 return -EINVAL;
3626
3627 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3628 }
3629
3630 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3631 u32 prefered_lft, u32 valid_lft)
3632 {
3633 u32 flags;
3634 clock_t expires;
3635 unsigned long timeout;
3636
3637 if (!valid_lft || (prefered_lft > valid_lft))
3638 return -EINVAL;
3639
3640 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3641 if (addrconf_finite_timeout(timeout)) {
3642 expires = jiffies_to_clock_t(timeout * HZ);
3643 valid_lft = timeout;
3644 flags = RTF_EXPIRES;
3645 } else {
3646 expires = 0;
3647 flags = 0;
3648 ifa_flags |= IFA_F_PERMANENT;
3649 }
3650
3651 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3652 if (addrconf_finite_timeout(timeout)) {
3653 if (timeout == 0)
3654 ifa_flags |= IFA_F_DEPRECATED;
3655 prefered_lft = timeout;
3656 }
3657
3658 spin_lock_bh(&ifp->lock);
3659 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3660 ifp->tstamp = jiffies;
3661 ifp->valid_lft = valid_lft;
3662 ifp->prefered_lft = prefered_lft;
3663
3664 spin_unlock_bh(&ifp->lock);
3665 if (!(ifp->flags&IFA_F_TENTATIVE))
3666 ipv6_ifa_notify(0, ifp);
3667
3668 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3669 expires, flags);
3670 addrconf_verify(0);
3671
3672 return 0;
3673 }
3674
3675 static int
3676 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3677 {
3678 struct net *net = sock_net(skb->sk);
3679 struct ifaddrmsg *ifm;
3680 struct nlattr *tb[IFA_MAX+1];
3681 struct in6_addr *pfx, *peer_pfx;
3682 struct inet6_ifaddr *ifa;
3683 struct net_device *dev;
3684 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3685 u8 ifa_flags;
3686 int err;
3687
3688 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3689 if (err < 0)
3690 return err;
3691
3692 ifm = nlmsg_data(nlh);
3693 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3694 if (pfx == NULL)
3695 return -EINVAL;
3696
3697 if (tb[IFA_CACHEINFO]) {
3698 struct ifa_cacheinfo *ci;
3699
3700 ci = nla_data(tb[IFA_CACHEINFO]);
3701 valid_lft = ci->ifa_valid;
3702 preferred_lft = ci->ifa_prefered;
3703 } else {
3704 preferred_lft = INFINITY_LIFE_TIME;
3705 valid_lft = INFINITY_LIFE_TIME;
3706 }
3707
3708 dev = __dev_get_by_index(net, ifm->ifa_index);
3709 if (dev == NULL)
3710 return -ENODEV;
3711
3712 /* We ignore other flags so far. */
3713 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3714
3715 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3716 if (ifa == NULL) {
3717 /*
3718 * It would be best to check for !NLM_F_CREATE here but
3719 * userspace alreay relies on not having to provide this.
3720 */
3721 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3722 ifm->ifa_prefixlen, ifa_flags,
3723 preferred_lft, valid_lft);
3724 }
3725
3726 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3727 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3728 err = -EEXIST;
3729 else
3730 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3731
3732 in6_ifa_put(ifa);
3733
3734 return err;
3735 }
3736
3737 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3738 u8 scope, int ifindex)
3739 {
3740 struct ifaddrmsg *ifm;
3741
3742 ifm = nlmsg_data(nlh);
3743 ifm->ifa_family = AF_INET6;
3744 ifm->ifa_prefixlen = prefixlen;
3745 ifm->ifa_flags = flags;
3746 ifm->ifa_scope = scope;
3747 ifm->ifa_index = ifindex;
3748 }
3749
3750 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3751 unsigned long tstamp, u32 preferred, u32 valid)
3752 {
3753 struct ifa_cacheinfo ci;
3754
3755 ci.cstamp = cstamp_delta(cstamp);
3756 ci.tstamp = cstamp_delta(tstamp);
3757 ci.ifa_prefered = preferred;
3758 ci.ifa_valid = valid;
3759
3760 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3761 }
3762
3763 static inline int rt_scope(int ifa_scope)
3764 {
3765 if (ifa_scope & IFA_HOST)
3766 return RT_SCOPE_HOST;
3767 else if (ifa_scope & IFA_LINK)
3768 return RT_SCOPE_LINK;
3769 else if (ifa_scope & IFA_SITE)
3770 return RT_SCOPE_SITE;
3771 else
3772 return RT_SCOPE_UNIVERSE;
3773 }
3774
3775 static inline int inet6_ifaddr_msgsize(void)
3776 {
3777 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3778 + nla_total_size(16) /* IFA_LOCAL */
3779 + nla_total_size(16) /* IFA_ADDRESS */
3780 + nla_total_size(sizeof(struct ifa_cacheinfo));
3781 }
3782
3783 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3784 u32 portid, u32 seq, int event, unsigned int flags)
3785 {
3786 struct nlmsghdr *nlh;
3787 u32 preferred, valid;
3788
3789 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3790 if (nlh == NULL)
3791 return -EMSGSIZE;
3792
3793 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3794 ifa->idev->dev->ifindex);
3795
3796 if (!(ifa->flags&IFA_F_PERMANENT)) {
3797 preferred = ifa->prefered_lft;
3798 valid = ifa->valid_lft;
3799 if (preferred != INFINITY_LIFE_TIME) {
3800 long tval = (jiffies - ifa->tstamp)/HZ;
3801 if (preferred > tval)
3802 preferred -= tval;
3803 else
3804 preferred = 0;
3805 if (valid != INFINITY_LIFE_TIME) {
3806 if (valid > tval)
3807 valid -= tval;
3808 else
3809 valid = 0;
3810 }
3811 }
3812 } else {
3813 preferred = INFINITY_LIFE_TIME;
3814 valid = INFINITY_LIFE_TIME;
3815 }
3816
3817 if (!ipv6_addr_any(&ifa->peer_addr)) {
3818 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3819 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3820 goto error;
3821 } else
3822 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3823 goto error;
3824
3825 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3826 goto error;
3827
3828 return nlmsg_end(skb, nlh);
3829
3830 error:
3831 nlmsg_cancel(skb, nlh);
3832 return -EMSGSIZE;
3833 }
3834
3835 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3836 u32 portid, u32 seq, int event, u16 flags)
3837 {
3838 struct nlmsghdr *nlh;
3839 u8 scope = RT_SCOPE_UNIVERSE;
3840 int ifindex = ifmca->idev->dev->ifindex;
3841
3842 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3843 scope = RT_SCOPE_SITE;
3844
3845 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3846 if (nlh == NULL)
3847 return -EMSGSIZE;
3848
3849 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3850 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3851 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3852 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3853 nlmsg_cancel(skb, nlh);
3854 return -EMSGSIZE;
3855 }
3856
3857 return nlmsg_end(skb, nlh);
3858 }
3859
3860 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3861 u32 portid, u32 seq, int event, unsigned int flags)
3862 {
3863 struct nlmsghdr *nlh;
3864 u8 scope = RT_SCOPE_UNIVERSE;
3865 int ifindex = ifaca->aca_idev->dev->ifindex;
3866
3867 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3868 scope = RT_SCOPE_SITE;
3869
3870 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3871 if (nlh == NULL)
3872 return -EMSGSIZE;
3873
3874 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3875 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3876 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3877 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3878 nlmsg_cancel(skb, nlh);
3879 return -EMSGSIZE;
3880 }
3881
3882 return nlmsg_end(skb, nlh);
3883 }
3884
3885 enum addr_type_t {
3886 UNICAST_ADDR,
3887 MULTICAST_ADDR,
3888 ANYCAST_ADDR,
3889 };
3890
3891 /* called with rcu_read_lock() */
3892 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3893 struct netlink_callback *cb, enum addr_type_t type,
3894 int s_ip_idx, int *p_ip_idx)
3895 {
3896 struct ifmcaddr6 *ifmca;
3897 struct ifacaddr6 *ifaca;
3898 int err = 1;
3899 int ip_idx = *p_ip_idx;
3900
3901 read_lock_bh(&idev->lock);
3902 switch (type) {
3903 case UNICAST_ADDR: {
3904 struct inet6_ifaddr *ifa;
3905
3906 /* unicast address incl. temp addr */
3907 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3908 if (++ip_idx < s_ip_idx)
3909 continue;
3910 err = inet6_fill_ifaddr(skb, ifa,
3911 NETLINK_CB(cb->skb).portid,
3912 cb->nlh->nlmsg_seq,
3913 RTM_NEWADDR,
3914 NLM_F_MULTI);
3915 if (err <= 0)
3916 break;
3917 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3918 }
3919 break;
3920 }
3921 case MULTICAST_ADDR:
3922 /* multicast address */
3923 for (ifmca = idev->mc_list; ifmca;
3924 ifmca = ifmca->next, ip_idx++) {
3925 if (ip_idx < s_ip_idx)
3926 continue;
3927 err = inet6_fill_ifmcaddr(skb, ifmca,
3928 NETLINK_CB(cb->skb).portid,
3929 cb->nlh->nlmsg_seq,
3930 RTM_GETMULTICAST,
3931 NLM_F_MULTI);
3932 if (err <= 0)
3933 break;
3934 }
3935 break;
3936 case ANYCAST_ADDR:
3937 /* anycast address */
3938 for (ifaca = idev->ac_list; ifaca;
3939 ifaca = ifaca->aca_next, ip_idx++) {
3940 if (ip_idx < s_ip_idx)
3941 continue;
3942 err = inet6_fill_ifacaddr(skb, ifaca,
3943 NETLINK_CB(cb->skb).portid,
3944 cb->nlh->nlmsg_seq,
3945 RTM_GETANYCAST,
3946 NLM_F_MULTI);
3947 if (err <= 0)
3948 break;
3949 }
3950 break;
3951 default:
3952 break;
3953 }
3954 read_unlock_bh(&idev->lock);
3955 *p_ip_idx = ip_idx;
3956 return err;
3957 }
3958
3959 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3960 enum addr_type_t type)
3961 {
3962 struct net *net = sock_net(skb->sk);
3963 int h, s_h;
3964 int idx, ip_idx;
3965 int s_idx, s_ip_idx;
3966 struct net_device *dev;
3967 struct inet6_dev *idev;
3968 struct hlist_head *head;
3969
3970 s_h = cb->args[0];
3971 s_idx = idx = cb->args[1];
3972 s_ip_idx = ip_idx = cb->args[2];
3973
3974 rcu_read_lock();
3975 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
3976 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3977 idx = 0;
3978 head = &net->dev_index_head[h];
3979 hlist_for_each_entry_rcu(dev, head, index_hlist) {
3980 if (idx < s_idx)
3981 goto cont;
3982 if (h > s_h || idx > s_idx)
3983 s_ip_idx = 0;
3984 ip_idx = 0;
3985 idev = __in6_dev_get(dev);
3986 if (!idev)
3987 goto cont;
3988
3989 if (in6_dump_addrs(idev, skb, cb, type,
3990 s_ip_idx, &ip_idx) <= 0)
3991 goto done;
3992 cont:
3993 idx++;
3994 }
3995 }
3996 done:
3997 rcu_read_unlock();
3998 cb->args[0] = h;
3999 cb->args[1] = idx;
4000 cb->args[2] = ip_idx;
4001
4002 return skb->len;
4003 }
4004
4005 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4006 {
4007 enum addr_type_t type = UNICAST_ADDR;
4008
4009 return inet6_dump_addr(skb, cb, type);
4010 }
4011
4012 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4013 {
4014 enum addr_type_t type = MULTICAST_ADDR;
4015
4016 return inet6_dump_addr(skb, cb, type);
4017 }
4018
4019
4020 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4021 {
4022 enum addr_type_t type = ANYCAST_ADDR;
4023
4024 return inet6_dump_addr(skb, cb, type);
4025 }
4026
4027 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4028 {
4029 struct net *net = sock_net(in_skb->sk);
4030 struct ifaddrmsg *ifm;
4031 struct nlattr *tb[IFA_MAX+1];
4032 struct in6_addr *addr = NULL, *peer;
4033 struct net_device *dev = NULL;
4034 struct inet6_ifaddr *ifa;
4035 struct sk_buff *skb;
4036 int err;
4037
4038 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4039 if (err < 0)
4040 goto errout;
4041
4042 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4043 if (addr == NULL) {
4044 err = -EINVAL;
4045 goto errout;
4046 }
4047
4048 ifm = nlmsg_data(nlh);
4049 if (ifm->ifa_index)
4050 dev = __dev_get_by_index(net, ifm->ifa_index);
4051
4052 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4053 if (!ifa) {
4054 err = -EADDRNOTAVAIL;
4055 goto errout;
4056 }
4057
4058 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4059 if (!skb) {
4060 err = -ENOBUFS;
4061 goto errout_ifa;
4062 }
4063
4064 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4065 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4066 if (err < 0) {
4067 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4068 WARN_ON(err == -EMSGSIZE);
4069 kfree_skb(skb);
4070 goto errout_ifa;
4071 }
4072 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4073 errout_ifa:
4074 in6_ifa_put(ifa);
4075 errout:
4076 return err;
4077 }
4078
4079 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4080 {
4081 struct sk_buff *skb;
4082 struct net *net = dev_net(ifa->idev->dev);
4083 int err = -ENOBUFS;
4084
4085 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4086 if (skb == NULL)
4087 goto errout;
4088
4089 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4090 if (err < 0) {
4091 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4092 WARN_ON(err == -EMSGSIZE);
4093 kfree_skb(skb);
4094 goto errout;
4095 }
4096 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4097 return;
4098 errout:
4099 if (err < 0)
4100 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4101 }
4102
4103 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4104 __s32 *array, int bytes)
4105 {
4106 BUG_ON(bytes < (DEVCONF_MAX * 4));
4107
4108 memset(array, 0, bytes);
4109 array[DEVCONF_FORWARDING] = cnf->forwarding;
4110 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4111 array[DEVCONF_MTU6] = cnf->mtu6;
4112 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4113 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4114 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4115 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4116 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4117 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4118 jiffies_to_msecs(cnf->rtr_solicit_interval);
4119 array[DEVCONF_RTR_SOLICIT_DELAY] =
4120 jiffies_to_msecs(cnf->rtr_solicit_delay);
4121 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4122 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4123 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4124 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4125 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4126 #ifdef CONFIG_IPV6_PRIVACY
4127 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4128 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4129 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4130 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4131 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4132 #endif
4133 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4134 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4135 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4136 #ifdef CONFIG_IPV6_ROUTER_PREF
4137 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4138 array[DEVCONF_RTR_PROBE_INTERVAL] =
4139 jiffies_to_msecs(cnf->rtr_probe_interval);
4140 #ifdef CONFIG_IPV6_ROUTE_INFO
4141 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4142 #endif
4143 #endif
4144 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4145 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4146 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4147 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4148 #endif
4149 #ifdef CONFIG_IPV6_MROUTE
4150 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4151 #endif
4152 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4153 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4154 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4155 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4156 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4157 }
4158
4159 static inline size_t inet6_ifla6_size(void)
4160 {
4161 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4162 + nla_total_size(sizeof(struct ifla_cacheinfo))
4163 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4164 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4165 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4166 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4167 }
4168
4169 static inline size_t inet6_if_nlmsg_size(void)
4170 {
4171 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4172 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4173 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4174 + nla_total_size(4) /* IFLA_MTU */
4175 + nla_total_size(4) /* IFLA_LINK */
4176 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4177 }
4178
4179 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4180 int items, int bytes)
4181 {
4182 int i;
4183 int pad = bytes - sizeof(u64) * items;
4184 BUG_ON(pad < 0);
4185
4186 /* Use put_unaligned() because stats may not be aligned for u64. */
4187 put_unaligned(items, &stats[0]);
4188 for (i = 1; i < items; i++)
4189 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4190
4191 memset(&stats[items], 0, pad);
4192 }
4193
4194 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4195 int items, int bytes, size_t syncpoff)
4196 {
4197 int i;
4198 int pad = bytes - sizeof(u64) * items;
4199 BUG_ON(pad < 0);
4200
4201 /* Use put_unaligned() because stats may not be aligned for u64. */
4202 put_unaligned(items, &stats[0]);
4203 for (i = 1; i < items; i++)
4204 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4205
4206 memset(&stats[items], 0, pad);
4207 }
4208
4209 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4210 int bytes)
4211 {
4212 switch (attrtype) {
4213 case IFLA_INET6_STATS:
4214 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4215 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4216 break;
4217 case IFLA_INET6_ICMP6STATS:
4218 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4219 break;
4220 }
4221 }
4222
4223 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4224 {
4225 struct nlattr *nla;
4226 struct ifla_cacheinfo ci;
4227
4228 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4229 goto nla_put_failure;
4230 ci.max_reasm_len = IPV6_MAXPLEN;
4231 ci.tstamp = cstamp_delta(idev->tstamp);
4232 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4233 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4234 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4235 goto nla_put_failure;
4236 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4237 if (nla == NULL)
4238 goto nla_put_failure;
4239 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4240
4241 /* XXX - MC not implemented */
4242
4243 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4244 if (nla == NULL)
4245 goto nla_put_failure;
4246 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4247
4248 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4249 if (nla == NULL)
4250 goto nla_put_failure;
4251 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4252
4253 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4254 if (nla == NULL)
4255 goto nla_put_failure;
4256 read_lock_bh(&idev->lock);
4257 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4258 read_unlock_bh(&idev->lock);
4259
4260 return 0;
4261
4262 nla_put_failure:
4263 return -EMSGSIZE;
4264 }
4265
4266 static size_t inet6_get_link_af_size(const struct net_device *dev)
4267 {
4268 if (!__in6_dev_get(dev))
4269 return 0;
4270
4271 return inet6_ifla6_size();
4272 }
4273
4274 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4275 {
4276 struct inet6_dev *idev = __in6_dev_get(dev);
4277
4278 if (!idev)
4279 return -ENODATA;
4280
4281 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4282 return -EMSGSIZE;
4283
4284 return 0;
4285 }
4286
4287 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4288 {
4289 struct inet6_ifaddr *ifp;
4290 struct net_device *dev = idev->dev;
4291 bool update_rs = false;
4292 struct in6_addr ll_addr;
4293
4294 if (token == NULL)
4295 return -EINVAL;
4296 if (ipv6_addr_any(token))
4297 return -EINVAL;
4298 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4299 return -EINVAL;
4300 if (!ipv6_accept_ra(idev))
4301 return -EINVAL;
4302 if (idev->cnf.rtr_solicits <= 0)
4303 return -EINVAL;
4304
4305 write_lock_bh(&idev->lock);
4306
4307 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4308 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4309
4310 write_unlock_bh(&idev->lock);
4311
4312 if (!idev->dead && (idev->if_flags & IF_READY) &&
4313 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4314 IFA_F_OPTIMISTIC)) {
4315
4316 /* If we're not ready, then normal ifup will take care
4317 * of this. Otherwise, we need to request our rs here.
4318 */
4319 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4320 update_rs = true;
4321 }
4322
4323 write_lock_bh(&idev->lock);
4324
4325 if (update_rs) {
4326 idev->if_flags |= IF_RS_SENT;
4327 idev->rs_probes = 1;
4328 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4329 }
4330
4331 /* Well, that's kinda nasty ... */
4332 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4333 spin_lock(&ifp->lock);
4334 if (ifp->tokenized) {
4335 ifp->valid_lft = 0;
4336 ifp->prefered_lft = 0;
4337 }
4338 spin_unlock(&ifp->lock);
4339 }
4340
4341 write_unlock_bh(&idev->lock);
4342 addrconf_verify(0);
4343 return 0;
4344 }
4345
4346 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4347 {
4348 int err = -EINVAL;
4349 struct inet6_dev *idev = __in6_dev_get(dev);
4350 struct nlattr *tb[IFLA_INET6_MAX + 1];
4351
4352 if (!idev)
4353 return -EAFNOSUPPORT;
4354
4355 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4356 BUG();
4357
4358 if (tb[IFLA_INET6_TOKEN])
4359 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4360
4361 return err;
4362 }
4363
4364 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4365 u32 portid, u32 seq, int event, unsigned int flags)
4366 {
4367 struct net_device *dev = idev->dev;
4368 struct ifinfomsg *hdr;
4369 struct nlmsghdr *nlh;
4370 void *protoinfo;
4371
4372 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4373 if (nlh == NULL)
4374 return -EMSGSIZE;
4375
4376 hdr = nlmsg_data(nlh);
4377 hdr->ifi_family = AF_INET6;
4378 hdr->__ifi_pad = 0;
4379 hdr->ifi_type = dev->type;
4380 hdr->ifi_index = dev->ifindex;
4381 hdr->ifi_flags = dev_get_flags(dev);
4382 hdr->ifi_change = 0;
4383
4384 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4385 (dev->addr_len &&
4386 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4387 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4388 (dev->ifindex != dev->iflink &&
4389 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4390 goto nla_put_failure;
4391 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4392 if (protoinfo == NULL)
4393 goto nla_put_failure;
4394
4395 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4396 goto nla_put_failure;
4397
4398 nla_nest_end(skb, protoinfo);
4399 return nlmsg_end(skb, nlh);
4400
4401 nla_put_failure:
4402 nlmsg_cancel(skb, nlh);
4403 return -EMSGSIZE;
4404 }
4405
4406 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4407 {
4408 struct net *net = sock_net(skb->sk);
4409 int h, s_h;
4410 int idx = 0, s_idx;
4411 struct net_device *dev;
4412 struct inet6_dev *idev;
4413 struct hlist_head *head;
4414
4415 s_h = cb->args[0];
4416 s_idx = cb->args[1];
4417
4418 rcu_read_lock();
4419 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4420 idx = 0;
4421 head = &net->dev_index_head[h];
4422 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4423 if (idx < s_idx)
4424 goto cont;
4425 idev = __in6_dev_get(dev);
4426 if (!idev)
4427 goto cont;
4428 if (inet6_fill_ifinfo(skb, idev,
4429 NETLINK_CB(cb->skb).portid,
4430 cb->nlh->nlmsg_seq,
4431 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4432 goto out;
4433 cont:
4434 idx++;
4435 }
4436 }
4437 out:
4438 rcu_read_unlock();
4439 cb->args[1] = idx;
4440 cb->args[0] = h;
4441
4442 return skb->len;
4443 }
4444
4445 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4446 {
4447 struct sk_buff *skb;
4448 struct net *net = dev_net(idev->dev);
4449 int err = -ENOBUFS;
4450
4451 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4452 if (skb == NULL)
4453 goto errout;
4454
4455 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4456 if (err < 0) {
4457 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4458 WARN_ON(err == -EMSGSIZE);
4459 kfree_skb(skb);
4460 goto errout;
4461 }
4462 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4463 return;
4464 errout:
4465 if (err < 0)
4466 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4467 }
4468
4469 static inline size_t inet6_prefix_nlmsg_size(void)
4470 {
4471 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4472 + nla_total_size(sizeof(struct in6_addr))
4473 + nla_total_size(sizeof(struct prefix_cacheinfo));
4474 }
4475
4476 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4477 struct prefix_info *pinfo, u32 portid, u32 seq,
4478 int event, unsigned int flags)
4479 {
4480 struct prefixmsg *pmsg;
4481 struct nlmsghdr *nlh;
4482 struct prefix_cacheinfo ci;
4483
4484 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4485 if (nlh == NULL)
4486 return -EMSGSIZE;
4487
4488 pmsg = nlmsg_data(nlh);
4489 pmsg->prefix_family = AF_INET6;
4490 pmsg->prefix_pad1 = 0;
4491 pmsg->prefix_pad2 = 0;
4492 pmsg->prefix_ifindex = idev->dev->ifindex;
4493 pmsg->prefix_len = pinfo->prefix_len;
4494 pmsg->prefix_type = pinfo->type;
4495 pmsg->prefix_pad3 = 0;
4496 pmsg->prefix_flags = 0;
4497 if (pinfo->onlink)
4498 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4499 if (pinfo->autoconf)
4500 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4501
4502 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4503 goto nla_put_failure;
4504 ci.preferred_time = ntohl(pinfo->prefered);
4505 ci.valid_time = ntohl(pinfo->valid);
4506 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4507 goto nla_put_failure;
4508 return nlmsg_end(skb, nlh);
4509
4510 nla_put_failure:
4511 nlmsg_cancel(skb, nlh);
4512 return -EMSGSIZE;
4513 }
4514
4515 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4516 struct prefix_info *pinfo)
4517 {
4518 struct sk_buff *skb;
4519 struct net *net = dev_net(idev->dev);
4520 int err = -ENOBUFS;
4521
4522 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4523 if (skb == NULL)
4524 goto errout;
4525
4526 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4527 if (err < 0) {
4528 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4529 WARN_ON(err == -EMSGSIZE);
4530 kfree_skb(skb);
4531 goto errout;
4532 }
4533 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4534 return;
4535 errout:
4536 if (err < 0)
4537 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4538 }
4539
4540 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4541 {
4542 write_lock_bh(&ifp->idev->lock);
4543 spin_lock(&ifp->lock);
4544 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4545 IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4546 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4547 ifp->idev->valid_ll_addr_cnt += count;
4548 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4549 spin_unlock(&ifp->lock);
4550 write_unlock_bh(&ifp->idev->lock);
4551 }
4552
4553 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4554 {
4555 struct net *net = dev_net(ifp->idev->dev);
4556
4557 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4558
4559 switch (event) {
4560 case RTM_NEWADDR:
4561 update_valid_ll_addr_cnt(ifp, 1);
4562
4563 /*
4564 * If the address was optimistic
4565 * we inserted the route at the start of
4566 * our DAD process, so we don't need
4567 * to do it again
4568 */
4569 if (!(ifp->rt->rt6i_node))
4570 ip6_ins_rt(ifp->rt);
4571 if (ifp->idev->cnf.forwarding)
4572 addrconf_join_anycast(ifp);
4573 if (!ipv6_addr_any(&ifp->peer_addr))
4574 addrconf_prefix_route(&ifp->peer_addr, 128,
4575 ifp->idev->dev, 0, 0);
4576 break;
4577 case RTM_DELADDR:
4578 update_valid_ll_addr_cnt(ifp, -1);
4579
4580 if (ifp->idev->cnf.forwarding)
4581 addrconf_leave_anycast(ifp);
4582 addrconf_leave_solict(ifp->idev, &ifp->addr);
4583 if (!ipv6_addr_any(&ifp->peer_addr)) {
4584 struct rt6_info *rt;
4585 struct net_device *dev = ifp->idev->dev;
4586
4587 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4588 dev->ifindex, 1);
4589 if (rt) {
4590 dst_hold(&rt->dst);
4591 if (ip6_del_rt(rt))
4592 dst_free(&rt->dst);
4593 }
4594 }
4595 dst_hold(&ifp->rt->dst);
4596
4597 if (ip6_del_rt(ifp->rt))
4598 dst_free(&ifp->rt->dst);
4599 break;
4600 }
4601 atomic_inc(&net->ipv6.dev_addr_genid);
4602 rt_genid_bump_ipv6(net);
4603 }
4604
4605 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4606 {
4607 rcu_read_lock_bh();
4608 if (likely(ifp->idev->dead == 0))
4609 __ipv6_ifa_notify(event, ifp);
4610 rcu_read_unlock_bh();
4611 }
4612
4613 #ifdef CONFIG_SYSCTL
4614
4615 static
4616 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4617 void __user *buffer, size_t *lenp, loff_t *ppos)
4618 {
4619 int *valp = ctl->data;
4620 int val = *valp;
4621 loff_t pos = *ppos;
4622 struct ctl_table lctl;
4623 int ret;
4624
4625 /*
4626 * ctl->data points to idev->cnf.forwarding, we should
4627 * not modify it until we get the rtnl lock.
4628 */
4629 lctl = *ctl;
4630 lctl.data = &val;
4631
4632 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4633
4634 if (write)
4635 ret = addrconf_fixup_forwarding(ctl, valp, val);
4636 if (ret)
4637 *ppos = pos;
4638 return ret;
4639 }
4640
4641 static void dev_disable_change(struct inet6_dev *idev)
4642 {
4643 struct netdev_notifier_info info;
4644
4645 if (!idev || !idev->dev)
4646 return;
4647
4648 netdev_notifier_info_init(&info, idev->dev);
4649 if (idev->cnf.disable_ipv6)
4650 addrconf_notify(NULL, NETDEV_DOWN, &info);
4651 else
4652 addrconf_notify(NULL, NETDEV_UP, &info);
4653 }
4654
4655 static void addrconf_disable_change(struct net *net, __s32 newf)
4656 {
4657 struct net_device *dev;
4658 struct inet6_dev *idev;
4659
4660 rcu_read_lock();
4661 for_each_netdev_rcu(net, dev) {
4662 idev = __in6_dev_get(dev);
4663 if (idev) {
4664 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4665 idev->cnf.disable_ipv6 = newf;
4666 if (changed)
4667 dev_disable_change(idev);
4668 }
4669 }
4670 rcu_read_unlock();
4671 }
4672
4673 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4674 {
4675 struct net *net;
4676 int old;
4677
4678 if (!rtnl_trylock())
4679 return restart_syscall();
4680
4681 net = (struct net *)table->extra2;
4682 old = *p;
4683 *p = newf;
4684
4685 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4686 rtnl_unlock();
4687 return 0;
4688 }
4689
4690 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4691 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4692 addrconf_disable_change(net, newf);
4693 } else if ((!newf) ^ (!old))
4694 dev_disable_change((struct inet6_dev *)table->extra1);
4695
4696 rtnl_unlock();
4697 return 0;
4698 }
4699
4700 static
4701 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4702 void __user *buffer, size_t *lenp, loff_t *ppos)
4703 {
4704 int *valp = ctl->data;
4705 int val = *valp;
4706 loff_t pos = *ppos;
4707 struct ctl_table lctl;
4708 int ret;
4709
4710 /*
4711 * ctl->data points to idev->cnf.disable_ipv6, we should
4712 * not modify it until we get the rtnl lock.
4713 */
4714 lctl = *ctl;
4715 lctl.data = &val;
4716
4717 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4718
4719 if (write)
4720 ret = addrconf_disable_ipv6(ctl, valp, val);
4721 if (ret)
4722 *ppos = pos;
4723 return ret;
4724 }
4725
4726 static struct addrconf_sysctl_table
4727 {
4728 struct ctl_table_header *sysctl_header;
4729 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4730 } addrconf_sysctl __read_mostly = {
4731 .sysctl_header = NULL,
4732 .addrconf_vars = {
4733 {
4734 .procname = "forwarding",
4735 .data = &ipv6_devconf.forwarding,
4736 .maxlen = sizeof(int),
4737 .mode = 0644,
4738 .proc_handler = addrconf_sysctl_forward,
4739 },
4740 {
4741 .procname = "hop_limit",
4742 .data = &ipv6_devconf.hop_limit,
4743 .maxlen = sizeof(int),
4744 .mode = 0644,
4745 .proc_handler = proc_dointvec,
4746 },
4747 {
4748 .procname = "mtu",
4749 .data = &ipv6_devconf.mtu6,
4750 .maxlen = sizeof(int),
4751 .mode = 0644,
4752 .proc_handler = proc_dointvec,
4753 },
4754 {
4755 .procname = "accept_ra",
4756 .data = &ipv6_devconf.accept_ra,
4757 .maxlen = sizeof(int),
4758 .mode = 0644,
4759 .proc_handler = proc_dointvec,
4760 },
4761 {
4762 .procname = "accept_redirects",
4763 .data = &ipv6_devconf.accept_redirects,
4764 .maxlen = sizeof(int),
4765 .mode = 0644,
4766 .proc_handler = proc_dointvec,
4767 },
4768 {
4769 .procname = "autoconf",
4770 .data = &ipv6_devconf.autoconf,
4771 .maxlen = sizeof(int),
4772 .mode = 0644,
4773 .proc_handler = proc_dointvec,
4774 },
4775 {
4776 .procname = "dad_transmits",
4777 .data = &ipv6_devconf.dad_transmits,
4778 .maxlen = sizeof(int),
4779 .mode = 0644,
4780 .proc_handler = proc_dointvec,
4781 },
4782 {
4783 .procname = "router_solicitations",
4784 .data = &ipv6_devconf.rtr_solicits,
4785 .maxlen = sizeof(int),
4786 .mode = 0644,
4787 .proc_handler = proc_dointvec,
4788 },
4789 {
4790 .procname = "router_solicitation_interval",
4791 .data = &ipv6_devconf.rtr_solicit_interval,
4792 .maxlen = sizeof(int),
4793 .mode = 0644,
4794 .proc_handler = proc_dointvec_jiffies,
4795 },
4796 {
4797 .procname = "router_solicitation_delay",
4798 .data = &ipv6_devconf.rtr_solicit_delay,
4799 .maxlen = sizeof(int),
4800 .mode = 0644,
4801 .proc_handler = proc_dointvec_jiffies,
4802 },
4803 {
4804 .procname = "force_mld_version",
4805 .data = &ipv6_devconf.force_mld_version,
4806 .maxlen = sizeof(int),
4807 .mode = 0644,
4808 .proc_handler = proc_dointvec,
4809 },
4810 {
4811 .procname = "mldv1_unsolicited_report_interval",
4812 .data =
4813 &ipv6_devconf.mldv1_unsolicited_report_interval,
4814 .maxlen = sizeof(int),
4815 .mode = 0644,
4816 .proc_handler = proc_dointvec_ms_jiffies,
4817 },
4818 {
4819 .procname = "mldv2_unsolicited_report_interval",
4820 .data =
4821 &ipv6_devconf.mldv2_unsolicited_report_interval,
4822 .maxlen = sizeof(int),
4823 .mode = 0644,
4824 .proc_handler = proc_dointvec_ms_jiffies,
4825 },
4826 #ifdef CONFIG_IPV6_PRIVACY
4827 {
4828 .procname = "use_tempaddr",
4829 .data = &ipv6_devconf.use_tempaddr,
4830 .maxlen = sizeof(int),
4831 .mode = 0644,
4832 .proc_handler = proc_dointvec,
4833 },
4834 {
4835 .procname = "temp_valid_lft",
4836 .data = &ipv6_devconf.temp_valid_lft,
4837 .maxlen = sizeof(int),
4838 .mode = 0644,
4839 .proc_handler = proc_dointvec,
4840 },
4841 {
4842 .procname = "temp_prefered_lft",
4843 .data = &ipv6_devconf.temp_prefered_lft,
4844 .maxlen = sizeof(int),
4845 .mode = 0644,
4846 .proc_handler = proc_dointvec,
4847 },
4848 {
4849 .procname = "regen_max_retry",
4850 .data = &ipv6_devconf.regen_max_retry,
4851 .maxlen = sizeof(int),
4852 .mode = 0644,
4853 .proc_handler = proc_dointvec,
4854 },
4855 {
4856 .procname = "max_desync_factor",
4857 .data = &ipv6_devconf.max_desync_factor,
4858 .maxlen = sizeof(int),
4859 .mode = 0644,
4860 .proc_handler = proc_dointvec,
4861 },
4862 #endif
4863 {
4864 .procname = "max_addresses",
4865 .data = &ipv6_devconf.max_addresses,
4866 .maxlen = sizeof(int),
4867 .mode = 0644,
4868 .proc_handler = proc_dointvec,
4869 },
4870 {
4871 .procname = "accept_ra_defrtr",
4872 .data = &ipv6_devconf.accept_ra_defrtr,
4873 .maxlen = sizeof(int),
4874 .mode = 0644,
4875 .proc_handler = proc_dointvec,
4876 },
4877 {
4878 .procname = "accept_ra_pinfo",
4879 .data = &ipv6_devconf.accept_ra_pinfo,
4880 .maxlen = sizeof(int),
4881 .mode = 0644,
4882 .proc_handler = proc_dointvec,
4883 },
4884 #ifdef CONFIG_IPV6_ROUTER_PREF
4885 {
4886 .procname = "accept_ra_rtr_pref",
4887 .data = &ipv6_devconf.accept_ra_rtr_pref,
4888 .maxlen = sizeof(int),
4889 .mode = 0644,
4890 .proc_handler = proc_dointvec,
4891 },
4892 {
4893 .procname = "router_probe_interval",
4894 .data = &ipv6_devconf.rtr_probe_interval,
4895 .maxlen = sizeof(int),
4896 .mode = 0644,
4897 .proc_handler = proc_dointvec_jiffies,
4898 },
4899 #ifdef CONFIG_IPV6_ROUTE_INFO
4900 {
4901 .procname = "accept_ra_rt_info_max_plen",
4902 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4903 .maxlen = sizeof(int),
4904 .mode = 0644,
4905 .proc_handler = proc_dointvec,
4906 },
4907 #endif
4908 #endif
4909 {
4910 .procname = "proxy_ndp",
4911 .data = &ipv6_devconf.proxy_ndp,
4912 .maxlen = sizeof(int),
4913 .mode = 0644,
4914 .proc_handler = proc_dointvec,
4915 },
4916 {
4917 .procname = "accept_source_route",
4918 .data = &ipv6_devconf.accept_source_route,
4919 .maxlen = sizeof(int),
4920 .mode = 0644,
4921 .proc_handler = proc_dointvec,
4922 },
4923 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4924 {
4925 .procname = "optimistic_dad",
4926 .data = &ipv6_devconf.optimistic_dad,
4927 .maxlen = sizeof(int),
4928 .mode = 0644,
4929 .proc_handler = proc_dointvec,
4930
4931 },
4932 #endif
4933 #ifdef CONFIG_IPV6_MROUTE
4934 {
4935 .procname = "mc_forwarding",
4936 .data = &ipv6_devconf.mc_forwarding,
4937 .maxlen = sizeof(int),
4938 .mode = 0444,
4939 .proc_handler = proc_dointvec,
4940 },
4941 #endif
4942 {
4943 .procname = "disable_ipv6",
4944 .data = &ipv6_devconf.disable_ipv6,
4945 .maxlen = sizeof(int),
4946 .mode = 0644,
4947 .proc_handler = addrconf_sysctl_disable,
4948 },
4949 {
4950 .procname = "accept_dad",
4951 .data = &ipv6_devconf.accept_dad,
4952 .maxlen = sizeof(int),
4953 .mode = 0644,
4954 .proc_handler = proc_dointvec,
4955 },
4956 {
4957 .procname = "force_tllao",
4958 .data = &ipv6_devconf.force_tllao,
4959 .maxlen = sizeof(int),
4960 .mode = 0644,
4961 .proc_handler = proc_dointvec
4962 },
4963 {
4964 .procname = "ndisc_notify",
4965 .data = &ipv6_devconf.ndisc_notify,
4966 .maxlen = sizeof(int),
4967 .mode = 0644,
4968 .proc_handler = proc_dointvec
4969 },
4970 {
4971 .procname = "suppress_frag_ndisc",
4972 .data = &ipv6_devconf.suppress_frag_ndisc,
4973 .maxlen = sizeof(int),
4974 .mode = 0644,
4975 .proc_handler = proc_dointvec
4976 },
4977 {
4978 /* sentinel */
4979 }
4980 },
4981 };
4982
4983 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4984 struct inet6_dev *idev, struct ipv6_devconf *p)
4985 {
4986 int i;
4987 struct addrconf_sysctl_table *t;
4988 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4989
4990 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4991 if (t == NULL)
4992 goto out;
4993
4994 for (i = 0; t->addrconf_vars[i].data; i++) {
4995 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4996 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4997 t->addrconf_vars[i].extra2 = net;
4998 }
4999
5000 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5001
5002 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5003 if (t->sysctl_header == NULL)
5004 goto free;
5005
5006 p->sysctl = t;
5007 return 0;
5008
5009 free:
5010 kfree(t);
5011 out:
5012 return -ENOBUFS;
5013 }
5014
5015 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5016 {
5017 struct addrconf_sysctl_table *t;
5018
5019 if (p->sysctl == NULL)
5020 return;
5021
5022 t = p->sysctl;
5023 p->sysctl = NULL;
5024 unregister_net_sysctl_table(t->sysctl_header);
5025 kfree(t);
5026 }
5027
5028 static void addrconf_sysctl_register(struct inet6_dev *idev)
5029 {
5030 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
5031 &ndisc_ifinfo_sysctl_change);
5032 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5033 idev, &idev->cnf);
5034 }
5035
5036 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5037 {
5038 __addrconf_sysctl_unregister(&idev->cnf);
5039 neigh_sysctl_unregister(idev->nd_parms);
5040 }
5041
5042
5043 #endif
5044
5045 static int __net_init addrconf_init_net(struct net *net)
5046 {
5047 int err = -ENOMEM;
5048 struct ipv6_devconf *all, *dflt;
5049
5050 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5051 if (all == NULL)
5052 goto err_alloc_all;
5053
5054 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5055 if (dflt == NULL)
5056 goto err_alloc_dflt;
5057
5058 /* these will be inherited by all namespaces */
5059 dflt->autoconf = ipv6_defaults.autoconf;
5060 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5061
5062 net->ipv6.devconf_all = all;
5063 net->ipv6.devconf_dflt = dflt;
5064
5065 #ifdef CONFIG_SYSCTL
5066 err = __addrconf_sysctl_register(net, "all", NULL, all);
5067 if (err < 0)
5068 goto err_reg_all;
5069
5070 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5071 if (err < 0)
5072 goto err_reg_dflt;
5073 #endif
5074 return 0;
5075
5076 #ifdef CONFIG_SYSCTL
5077 err_reg_dflt:
5078 __addrconf_sysctl_unregister(all);
5079 err_reg_all:
5080 kfree(dflt);
5081 #endif
5082 err_alloc_dflt:
5083 kfree(all);
5084 err_alloc_all:
5085 return err;
5086 }
5087
5088 static void __net_exit addrconf_exit_net(struct net *net)
5089 {
5090 #ifdef CONFIG_SYSCTL
5091 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5092 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5093 #endif
5094 if (!net_eq(net, &init_net)) {
5095 kfree(net->ipv6.devconf_dflt);
5096 kfree(net->ipv6.devconf_all);
5097 }
5098 }
5099
5100 static struct pernet_operations addrconf_ops = {
5101 .init = addrconf_init_net,
5102 .exit = addrconf_exit_net,
5103 };
5104
5105 static struct rtnl_af_ops inet6_ops = {
5106 .family = AF_INET6,
5107 .fill_link_af = inet6_fill_link_af,
5108 .get_link_af_size = inet6_get_link_af_size,
5109 .set_link_af = inet6_set_link_af,
5110 };
5111
5112 /*
5113 * Init / cleanup code
5114 */
5115
5116 int __init addrconf_init(void)
5117 {
5118 int i, err;
5119
5120 err = ipv6_addr_label_init();
5121 if (err < 0) {
5122 pr_crit("%s: cannot initialize default policy table: %d\n",
5123 __func__, err);
5124 goto out;
5125 }
5126
5127 err = register_pernet_subsys(&addrconf_ops);
5128 if (err < 0)
5129 goto out_addrlabel;
5130
5131 /* The addrconf netdev notifier requires that loopback_dev
5132 * has it's ipv6 private information allocated and setup
5133 * before it can bring up and give link-local addresses
5134 * to other devices which are up.
5135 *
5136 * Unfortunately, loopback_dev is not necessarily the first
5137 * entry in the global dev_base list of net devices. In fact,
5138 * it is likely to be the very last entry on that list.
5139 * So this causes the notifier registry below to try and
5140 * give link-local addresses to all devices besides loopback_dev
5141 * first, then loopback_dev, which cases all the non-loopback_dev
5142 * devices to fail to get a link-local address.
5143 *
5144 * So, as a temporary fix, allocate the ipv6 structure for
5145 * loopback_dev first by hand.
5146 * Longer term, all of the dependencies ipv6 has upon the loopback
5147 * device and it being up should be removed.
5148 */
5149 rtnl_lock();
5150 if (!ipv6_add_dev(init_net.loopback_dev))
5151 err = -ENOMEM;
5152 rtnl_unlock();
5153 if (err)
5154 goto errlo;
5155
5156 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5157 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5158
5159 register_netdevice_notifier(&ipv6_dev_notf);
5160
5161 addrconf_verify(0);
5162
5163 err = rtnl_af_register(&inet6_ops);
5164 if (err < 0)
5165 goto errout_af;
5166
5167 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5168 NULL);
5169 if (err < 0)
5170 goto errout;
5171
5172 /* Only the first call to __rtnl_register can fail */
5173 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5174 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5175 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5176 inet6_dump_ifaddr, NULL);
5177 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5178 inet6_dump_ifmcaddr, NULL);
5179 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5180 inet6_dump_ifacaddr, NULL);
5181 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5182 inet6_netconf_dump_devconf, NULL);
5183
5184 ipv6_addr_label_rtnl_register();
5185
5186 return 0;
5187 errout:
5188 rtnl_af_unregister(&inet6_ops);
5189 errout_af:
5190 unregister_netdevice_notifier(&ipv6_dev_notf);
5191 errlo:
5192 unregister_pernet_subsys(&addrconf_ops);
5193 out_addrlabel:
5194 ipv6_addr_label_cleanup();
5195 out:
5196 return err;
5197 }
5198
5199 void addrconf_cleanup(void)
5200 {
5201 struct net_device *dev;
5202 int i;
5203
5204 unregister_netdevice_notifier(&ipv6_dev_notf);
5205 unregister_pernet_subsys(&addrconf_ops);
5206 ipv6_addr_label_cleanup();
5207
5208 rtnl_lock();
5209
5210 __rtnl_af_unregister(&inet6_ops);
5211
5212 /* clean dev list */
5213 for_each_netdev(&init_net, dev) {
5214 if (__in6_dev_get(dev) == NULL)
5215 continue;
5216 addrconf_ifdown(dev, 1);
5217 }
5218 addrconf_ifdown(init_net.loopback_dev, 2);
5219
5220 /*
5221 * Check hash table.
5222 */
5223 spin_lock_bh(&addrconf_hash_lock);
5224 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5225 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5226 spin_unlock_bh(&addrconf_hash_lock);
5227
5228 del_timer(&addr_chk_timer);
5229 rtnl_unlock();
5230 }
Linux kernel - Deliverables
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