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ipv6 addrconf: add IFA_F_NOPREFIXROUTE flag to suppress creation of IP6 routes
[deliverable/linux.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/in6.h>
50 #include <linux/netdevice.h>
51 #include <linux/if_addr.h>
52 #include <linux/if_arp.h>
53 #include <linux/if_arcnet.h>
54 #include <linux/if_infiniband.h>
55 #include <linux/route.h>
56 #include <linux/inetdevice.h>
57 #include <linux/init.h>
58 #include <linux/slab.h>
59 #ifdef CONFIG_SYSCTL
60 #include <linux/sysctl.h>
61 #endif
62 #include <linux/capability.h>
63 #include <linux/delay.h>
64 #include <linux/notifier.h>
65 #include <linux/string.h>
66 #include <linux/hash.h>
67
68 #include <net/net_namespace.h>
69 #include <net/sock.h>
70 #include <net/snmp.h>
71
72 #include <net/af_ieee802154.h>
73 #include <net/firewire.h>
74 #include <net/ipv6.h>
75 #include <net/protocol.h>
76 #include <net/ndisc.h>
77 #include <net/ip6_route.h>
78 #include <net/addrconf.h>
79 #include <net/tcp.h>
80 #include <net/ip.h>
81 #include <net/netlink.h>
82 #include <net/pkt_sched.h>
83 #include <linux/if_tunnel.h>
84 #include <linux/rtnetlink.h>
85 #include <linux/netconf.h>
86 #include <linux/random.h>
87 #include <linux/uaccess.h>
88 #include <asm/unaligned.h>
89
90 #include <linux/proc_fs.h>
91 #include <linux/seq_file.h>
92 #include <linux/export.h>
93
94 /* Set to 3 to get tracing... */
95 #define ACONF_DEBUG 2
96
97 #if ACONF_DEBUG >= 3
98 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
99 #else
100 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
101 #endif
102
103 #define INFINITY_LIFE_TIME 0xFFFFFFFF
104
105 static inline u32 cstamp_delta(unsigned long cstamp)
106 {
107 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
108 }
109
110 #ifdef CONFIG_SYSCTL
111 static void addrconf_sysctl_register(struct inet6_dev *idev);
112 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
113 #else
114 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
115 {
116 }
117
118 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
119 {
120 }
121 #endif
122
123 static void __ipv6_regen_rndid(struct inet6_dev *idev);
124 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
125 static void ipv6_regen_rndid(unsigned long data);
126
127 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
128 static int ipv6_count_addresses(struct inet6_dev *idev);
129
130 /*
131 * Configured unicast address hash table
132 */
133 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
134 static DEFINE_SPINLOCK(addrconf_hash_lock);
135
136 static void addrconf_verify(unsigned long);
137
138 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
139 static DEFINE_SPINLOCK(addrconf_verify_lock);
140
141 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
142 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
143
144 static void addrconf_type_change(struct net_device *dev,
145 unsigned long event);
146 static int addrconf_ifdown(struct net_device *dev, int how);
147
148 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
149 int plen,
150 const struct net_device *dev,
151 u32 flags, u32 noflags);
152
153 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
154 static void addrconf_dad_timer(unsigned long data);
155 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
156 static void addrconf_dad_run(struct inet6_dev *idev);
157 static void addrconf_rs_timer(unsigned long data);
158 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
159 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
160
161 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
162 struct prefix_info *pinfo);
163 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
164 struct net_device *dev);
165
166 static struct ipv6_devconf ipv6_devconf __read_mostly = {
167 .forwarding = 0,
168 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
169 .mtu6 = IPV6_MIN_MTU,
170 .accept_ra = 1,
171 .accept_redirects = 1,
172 .autoconf = 1,
173 .force_mld_version = 0,
174 .mldv1_unsolicited_report_interval = 10 * HZ,
175 .mldv2_unsolicited_report_interval = HZ,
176 .dad_transmits = 1,
177 .rtr_solicits = MAX_RTR_SOLICITATIONS,
178 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
179 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
180 .use_tempaddr = 0,
181 .temp_valid_lft = TEMP_VALID_LIFETIME,
182 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
183 .regen_max_retry = REGEN_MAX_RETRY,
184 .max_desync_factor = MAX_DESYNC_FACTOR,
185 .max_addresses = IPV6_MAX_ADDRESSES,
186 .accept_ra_defrtr = 1,
187 .accept_ra_pinfo = 1,
188 #ifdef CONFIG_IPV6_ROUTER_PREF
189 .accept_ra_rtr_pref = 1,
190 .rtr_probe_interval = 60 * HZ,
191 #ifdef CONFIG_IPV6_ROUTE_INFO
192 .accept_ra_rt_info_max_plen = 0,
193 #endif
194 #endif
195 .proxy_ndp = 0,
196 .accept_source_route = 0, /* we do not accept RH0 by default. */
197 .disable_ipv6 = 0,
198 .accept_dad = 1,
199 .suppress_frag_ndisc = 1,
200 };
201
202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
203 .forwarding = 0,
204 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
205 .mtu6 = IPV6_MIN_MTU,
206 .accept_ra = 1,
207 .accept_redirects = 1,
208 .autoconf = 1,
209 .force_mld_version = 0,
210 .mldv1_unsolicited_report_interval = 10 * HZ,
211 .mldv2_unsolicited_report_interval = HZ,
212 .dad_transmits = 1,
213 .rtr_solicits = MAX_RTR_SOLICITATIONS,
214 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
215 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
216 .use_tempaddr = 0,
217 .temp_valid_lft = TEMP_VALID_LIFETIME,
218 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
219 .regen_max_retry = REGEN_MAX_RETRY,
220 .max_desync_factor = MAX_DESYNC_FACTOR,
221 .max_addresses = IPV6_MAX_ADDRESSES,
222 .accept_ra_defrtr = 1,
223 .accept_ra_pinfo = 1,
224 #ifdef CONFIG_IPV6_ROUTER_PREF
225 .accept_ra_rtr_pref = 1,
226 .rtr_probe_interval = 60 * HZ,
227 #ifdef CONFIG_IPV6_ROUTE_INFO
228 .accept_ra_rt_info_max_plen = 0,
229 #endif
230 #endif
231 .proxy_ndp = 0,
232 .accept_source_route = 0, /* we do not accept RH0 by default. */
233 .disable_ipv6 = 0,
234 .accept_dad = 1,
235 .suppress_frag_ndisc = 1,
236 };
237
238 /* Check if a valid qdisc is available */
239 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
240 {
241 return !qdisc_tx_is_noop(dev);
242 }
243
244 static void addrconf_del_rs_timer(struct inet6_dev *idev)
245 {
246 if (del_timer(&idev->rs_timer))
247 __in6_dev_put(idev);
248 }
249
250 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
251 {
252 if (del_timer(&ifp->dad_timer))
253 __in6_ifa_put(ifp);
254 }
255
256 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
257 unsigned long when)
258 {
259 if (!timer_pending(&idev->rs_timer))
260 in6_dev_hold(idev);
261 mod_timer(&idev->rs_timer, jiffies + when);
262 }
263
264 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
265 unsigned long when)
266 {
267 if (!timer_pending(&ifp->dad_timer))
268 in6_ifa_hold(ifp);
269 mod_timer(&ifp->dad_timer, jiffies + when);
270 }
271
272 static int snmp6_alloc_dev(struct inet6_dev *idev)
273 {
274 int i;
275
276 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
277 sizeof(struct ipstats_mib),
278 __alignof__(struct ipstats_mib)) < 0)
279 goto err_ip;
280
281 for_each_possible_cpu(i) {
282 struct ipstats_mib *addrconf_stats;
283 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[0], i);
284 u64_stats_init(&addrconf_stats->syncp);
285 #if SNMP_ARRAY_SZ == 2
286 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[1], i);
287 u64_stats_init(&addrconf_stats->syncp);
288 #endif
289 }
290
291
292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
293 GFP_KERNEL);
294 if (!idev->stats.icmpv6dev)
295 goto err_icmp;
296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
297 GFP_KERNEL);
298 if (!idev->stats.icmpv6msgdev)
299 goto err_icmpmsg;
300
301 return 0;
302
303 err_icmpmsg:
304 kfree(idev->stats.icmpv6dev);
305 err_icmp:
306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
307 err_ip:
308 return -ENOMEM;
309 }
310
311 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
312 {
313 struct inet6_dev *ndev;
314
315 ASSERT_RTNL();
316
317 if (dev->mtu < IPV6_MIN_MTU)
318 return NULL;
319
320 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
321
322 if (ndev == NULL)
323 return NULL;
324
325 rwlock_init(&ndev->lock);
326 ndev->dev = dev;
327 INIT_LIST_HEAD(&ndev->addr_list);
328 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
329 (unsigned long)ndev);
330 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
331 ndev->cnf.mtu6 = dev->mtu;
332 ndev->cnf.sysctl = NULL;
333 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
334 if (ndev->nd_parms == NULL) {
335 kfree(ndev);
336 return NULL;
337 }
338 if (ndev->cnf.forwarding)
339 dev_disable_lro(dev);
340 /* We refer to the device */
341 dev_hold(dev);
342
343 if (snmp6_alloc_dev(ndev) < 0) {
344 ADBG(KERN_WARNING
345 "%s: cannot allocate memory for statistics; dev=%s.\n",
346 __func__, dev->name);
347 neigh_parms_release(&nd_tbl, ndev->nd_parms);
348 dev_put(dev);
349 kfree(ndev);
350 return NULL;
351 }
352
353 if (snmp6_register_dev(ndev) < 0) {
354 ADBG(KERN_WARNING
355 "%s: cannot create /proc/net/dev_snmp6/%s\n",
356 __func__, dev->name);
357 neigh_parms_release(&nd_tbl, ndev->nd_parms);
358 ndev->dead = 1;
359 in6_dev_finish_destroy(ndev);
360 return NULL;
361 }
362
363 /* One reference from device. We must do this before
364 * we invoke __ipv6_regen_rndid().
365 */
366 in6_dev_hold(ndev);
367
368 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
369 ndev->cnf.accept_dad = -1;
370
371 #if IS_ENABLED(CONFIG_IPV6_SIT)
372 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
373 pr_info("%s: Disabled Multicast RS\n", dev->name);
374 ndev->cnf.rtr_solicits = 0;
375 }
376 #endif
377
378 INIT_LIST_HEAD(&ndev->tempaddr_list);
379 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
380 if ((dev->flags&IFF_LOOPBACK) ||
381 dev->type == ARPHRD_TUNNEL ||
382 dev->type == ARPHRD_TUNNEL6 ||
383 dev->type == ARPHRD_SIT ||
384 dev->type == ARPHRD_NONE) {
385 ndev->cnf.use_tempaddr = -1;
386 } else {
387 in6_dev_hold(ndev);
388 ipv6_regen_rndid((unsigned long) ndev);
389 }
390
391 ndev->token = in6addr_any;
392
393 if (netif_running(dev) && addrconf_qdisc_ok(dev))
394 ndev->if_flags |= IF_READY;
395
396 ipv6_mc_init_dev(ndev);
397 ndev->tstamp = jiffies;
398 addrconf_sysctl_register(ndev);
399 /* protected by rtnl_lock */
400 rcu_assign_pointer(dev->ip6_ptr, ndev);
401
402 /* Join interface-local all-node multicast group */
403 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
404
405 /* Join all-node multicast group */
406 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
407
408 /* Join all-router multicast group if forwarding is set */
409 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
410 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
411
412 return ndev;
413 }
414
415 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
416 {
417 struct inet6_dev *idev;
418
419 ASSERT_RTNL();
420
421 idev = __in6_dev_get(dev);
422 if (!idev) {
423 idev = ipv6_add_dev(dev);
424 if (!idev)
425 return NULL;
426 }
427
428 if (dev->flags&IFF_UP)
429 ipv6_mc_up(idev);
430 return idev;
431 }
432
433 static int inet6_netconf_msgsize_devconf(int type)
434 {
435 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
436 + nla_total_size(4); /* NETCONFA_IFINDEX */
437
438 /* type -1 is used for ALL */
439 if (type == -1 || type == NETCONFA_FORWARDING)
440 size += nla_total_size(4);
441 #ifdef CONFIG_IPV6_MROUTE
442 if (type == -1 || type == NETCONFA_MC_FORWARDING)
443 size += nla_total_size(4);
444 #endif
445 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
446 size += nla_total_size(4);
447
448 return size;
449 }
450
451 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
452 struct ipv6_devconf *devconf, u32 portid,
453 u32 seq, int event, unsigned int flags,
454 int type)
455 {
456 struct nlmsghdr *nlh;
457 struct netconfmsg *ncm;
458
459 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
460 flags);
461 if (nlh == NULL)
462 return -EMSGSIZE;
463
464 ncm = nlmsg_data(nlh);
465 ncm->ncm_family = AF_INET6;
466
467 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
468 goto nla_put_failure;
469
470 /* type -1 is used for ALL */
471 if ((type == -1 || type == NETCONFA_FORWARDING) &&
472 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
473 goto nla_put_failure;
474 #ifdef CONFIG_IPV6_MROUTE
475 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
476 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
477 devconf->mc_forwarding) < 0)
478 goto nla_put_failure;
479 #endif
480 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
481 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
482 goto nla_put_failure;
483
484 return nlmsg_end(skb, nlh);
485
486 nla_put_failure:
487 nlmsg_cancel(skb, nlh);
488 return -EMSGSIZE;
489 }
490
491 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
492 struct ipv6_devconf *devconf)
493 {
494 struct sk_buff *skb;
495 int err = -ENOBUFS;
496
497 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
498 if (skb == NULL)
499 goto errout;
500
501 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
502 RTM_NEWNETCONF, 0, type);
503 if (err < 0) {
504 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
505 WARN_ON(err == -EMSGSIZE);
506 kfree_skb(skb);
507 goto errout;
508 }
509 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
510 return;
511 errout:
512 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
513 }
514
515 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
516 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
517 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
518 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
519 };
520
521 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
522 struct nlmsghdr *nlh)
523 {
524 struct net *net = sock_net(in_skb->sk);
525 struct nlattr *tb[NETCONFA_MAX+1];
526 struct netconfmsg *ncm;
527 struct sk_buff *skb;
528 struct ipv6_devconf *devconf;
529 struct inet6_dev *in6_dev;
530 struct net_device *dev;
531 int ifindex;
532 int err;
533
534 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
535 devconf_ipv6_policy);
536 if (err < 0)
537 goto errout;
538
539 err = EINVAL;
540 if (!tb[NETCONFA_IFINDEX])
541 goto errout;
542
543 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
544 switch (ifindex) {
545 case NETCONFA_IFINDEX_ALL:
546 devconf = net->ipv6.devconf_all;
547 break;
548 case NETCONFA_IFINDEX_DEFAULT:
549 devconf = net->ipv6.devconf_dflt;
550 break;
551 default:
552 dev = __dev_get_by_index(net, ifindex);
553 if (dev == NULL)
554 goto errout;
555 in6_dev = __in6_dev_get(dev);
556 if (in6_dev == NULL)
557 goto errout;
558 devconf = &in6_dev->cnf;
559 break;
560 }
561
562 err = -ENOBUFS;
563 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
564 if (skb == NULL)
565 goto errout;
566
567 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
568 NETLINK_CB(in_skb).portid,
569 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
570 -1);
571 if (err < 0) {
572 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
573 WARN_ON(err == -EMSGSIZE);
574 kfree_skb(skb);
575 goto errout;
576 }
577 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
578 errout:
579 return err;
580 }
581
582 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
583 struct netlink_callback *cb)
584 {
585 struct net *net = sock_net(skb->sk);
586 int h, s_h;
587 int idx, s_idx;
588 struct net_device *dev;
589 struct inet6_dev *idev;
590 struct hlist_head *head;
591
592 s_h = cb->args[0];
593 s_idx = idx = cb->args[1];
594
595 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
596 idx = 0;
597 head = &net->dev_index_head[h];
598 rcu_read_lock();
599 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
600 net->dev_base_seq;
601 hlist_for_each_entry_rcu(dev, head, index_hlist) {
602 if (idx < s_idx)
603 goto cont;
604 idev = __in6_dev_get(dev);
605 if (!idev)
606 goto cont;
607
608 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
609 &idev->cnf,
610 NETLINK_CB(cb->skb).portid,
611 cb->nlh->nlmsg_seq,
612 RTM_NEWNETCONF,
613 NLM_F_MULTI,
614 -1) <= 0) {
615 rcu_read_unlock();
616 goto done;
617 }
618 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
619 cont:
620 idx++;
621 }
622 rcu_read_unlock();
623 }
624 if (h == NETDEV_HASHENTRIES) {
625 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
626 net->ipv6.devconf_all,
627 NETLINK_CB(cb->skb).portid,
628 cb->nlh->nlmsg_seq,
629 RTM_NEWNETCONF, NLM_F_MULTI,
630 -1) <= 0)
631 goto done;
632 else
633 h++;
634 }
635 if (h == NETDEV_HASHENTRIES + 1) {
636 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
637 net->ipv6.devconf_dflt,
638 NETLINK_CB(cb->skb).portid,
639 cb->nlh->nlmsg_seq,
640 RTM_NEWNETCONF, NLM_F_MULTI,
641 -1) <= 0)
642 goto done;
643 else
644 h++;
645 }
646 done:
647 cb->args[0] = h;
648 cb->args[1] = idx;
649
650 return skb->len;
651 }
652
653 #ifdef CONFIG_SYSCTL
654 static void dev_forward_change(struct inet6_dev *idev)
655 {
656 struct net_device *dev;
657 struct inet6_ifaddr *ifa;
658
659 if (!idev)
660 return;
661 dev = idev->dev;
662 if (idev->cnf.forwarding)
663 dev_disable_lro(dev);
664 if (dev->flags & IFF_MULTICAST) {
665 if (idev->cnf.forwarding) {
666 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
667 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
668 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
669 } else {
670 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
671 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
672 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
673 }
674 }
675
676 list_for_each_entry(ifa, &idev->addr_list, if_list) {
677 if (ifa->flags&IFA_F_TENTATIVE)
678 continue;
679 if (idev->cnf.forwarding)
680 addrconf_join_anycast(ifa);
681 else
682 addrconf_leave_anycast(ifa);
683 }
684 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
685 dev->ifindex, &idev->cnf);
686 }
687
688
689 static void addrconf_forward_change(struct net *net, __s32 newf)
690 {
691 struct net_device *dev;
692 struct inet6_dev *idev;
693
694 for_each_netdev(net, dev) {
695 idev = __in6_dev_get(dev);
696 if (idev) {
697 int changed = (!idev->cnf.forwarding) ^ (!newf);
698 idev->cnf.forwarding = newf;
699 if (changed)
700 dev_forward_change(idev);
701 }
702 }
703 }
704
705 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
706 {
707 struct net *net;
708 int old;
709
710 if (!rtnl_trylock())
711 return restart_syscall();
712
713 net = (struct net *)table->extra2;
714 old = *p;
715 *p = newf;
716
717 if (p == &net->ipv6.devconf_dflt->forwarding) {
718 if ((!newf) ^ (!old))
719 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
720 NETCONFA_IFINDEX_DEFAULT,
721 net->ipv6.devconf_dflt);
722 rtnl_unlock();
723 return 0;
724 }
725
726 if (p == &net->ipv6.devconf_all->forwarding) {
727 net->ipv6.devconf_dflt->forwarding = newf;
728 addrconf_forward_change(net, newf);
729 if ((!newf) ^ (!old))
730 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
731 NETCONFA_IFINDEX_ALL,
732 net->ipv6.devconf_all);
733 } else if ((!newf) ^ (!old))
734 dev_forward_change((struct inet6_dev *)table->extra1);
735 rtnl_unlock();
736
737 if (newf)
738 rt6_purge_dflt_routers(net);
739 return 1;
740 }
741 #endif
742
743 /* Nobody refers to this ifaddr, destroy it */
744 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
745 {
746 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
747
748 #ifdef NET_REFCNT_DEBUG
749 pr_debug("%s\n", __func__);
750 #endif
751
752 in6_dev_put(ifp->idev);
753
754 if (del_timer(&ifp->dad_timer))
755 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
756
757 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
758 pr_warn("Freeing alive inet6 address %p\n", ifp);
759 return;
760 }
761 ip6_rt_put(ifp->rt);
762
763 kfree_rcu(ifp, rcu);
764 }
765
766 static void
767 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
768 {
769 struct list_head *p;
770 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
771
772 /*
773 * Each device address list is sorted in order of scope -
774 * global before linklocal.
775 */
776 list_for_each(p, &idev->addr_list) {
777 struct inet6_ifaddr *ifa
778 = list_entry(p, struct inet6_ifaddr, if_list);
779 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
780 break;
781 }
782
783 list_add_tail(&ifp->if_list, p);
784 }
785
786 static u32 inet6_addr_hash(const struct in6_addr *addr)
787 {
788 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
789 }
790
791 /* On success it returns ifp with increased reference count */
792
793 static struct inet6_ifaddr *
794 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
795 const struct in6_addr *peer_addr, int pfxlen,
796 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
797 {
798 struct inet6_ifaddr *ifa = NULL;
799 struct rt6_info *rt;
800 unsigned int hash;
801 int err = 0;
802 int addr_type = ipv6_addr_type(addr);
803
804 if (addr_type == IPV6_ADDR_ANY ||
805 addr_type & IPV6_ADDR_MULTICAST ||
806 (!(idev->dev->flags & IFF_LOOPBACK) &&
807 addr_type & IPV6_ADDR_LOOPBACK))
808 return ERR_PTR(-EADDRNOTAVAIL);
809
810 rcu_read_lock_bh();
811 if (idev->dead) {
812 err = -ENODEV; /*XXX*/
813 goto out2;
814 }
815
816 if (idev->cnf.disable_ipv6) {
817 err = -EACCES;
818 goto out2;
819 }
820
821 spin_lock(&addrconf_hash_lock);
822
823 /* Ignore adding duplicate addresses on an interface */
824 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
825 ADBG("ipv6_add_addr: already assigned\n");
826 err = -EEXIST;
827 goto out;
828 }
829
830 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
831
832 if (ifa == NULL) {
833 ADBG("ipv6_add_addr: malloc failed\n");
834 err = -ENOBUFS;
835 goto out;
836 }
837
838 rt = addrconf_dst_alloc(idev, addr, false);
839 if (IS_ERR(rt)) {
840 err = PTR_ERR(rt);
841 goto out;
842 }
843
844 neigh_parms_data_state_setall(idev->nd_parms);
845
846 ifa->addr = *addr;
847 if (peer_addr)
848 ifa->peer_addr = *peer_addr;
849
850 spin_lock_init(&ifa->lock);
851 spin_lock_init(&ifa->state_lock);
852 setup_timer(&ifa->dad_timer, addrconf_dad_timer,
853 (unsigned long)ifa);
854 INIT_HLIST_NODE(&ifa->addr_lst);
855 ifa->scope = scope;
856 ifa->prefix_len = pfxlen;
857 ifa->flags = flags | IFA_F_TENTATIVE;
858 ifa->valid_lft = valid_lft;
859 ifa->prefered_lft = prefered_lft;
860 ifa->cstamp = ifa->tstamp = jiffies;
861 ifa->tokenized = false;
862
863 ifa->rt = rt;
864
865 ifa->idev = idev;
866 in6_dev_hold(idev);
867 /* For caller */
868 in6_ifa_hold(ifa);
869
870 /* Add to big hash table */
871 hash = inet6_addr_hash(addr);
872
873 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
874 spin_unlock(&addrconf_hash_lock);
875
876 write_lock(&idev->lock);
877 /* Add to inet6_dev unicast addr list. */
878 ipv6_link_dev_addr(idev, ifa);
879
880 if (ifa->flags&IFA_F_TEMPORARY) {
881 list_add(&ifa->tmp_list, &idev->tempaddr_list);
882 in6_ifa_hold(ifa);
883 }
884
885 in6_ifa_hold(ifa);
886 write_unlock(&idev->lock);
887 out2:
888 rcu_read_unlock_bh();
889
890 if (likely(err == 0))
891 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
892 else {
893 kfree(ifa);
894 ifa = ERR_PTR(err);
895 }
896
897 return ifa;
898 out:
899 spin_unlock(&addrconf_hash_lock);
900 goto out2;
901 }
902
903 /* This function wants to get referenced ifp and releases it before return */
904
905 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
906 {
907 struct inet6_ifaddr *ifa, *ifn;
908 struct inet6_dev *idev = ifp->idev;
909 int state;
910 int deleted = 0, onlink = 0;
911 unsigned long expires = jiffies;
912
913 spin_lock_bh(&ifp->state_lock);
914 state = ifp->state;
915 ifp->state = INET6_IFADDR_STATE_DEAD;
916 spin_unlock_bh(&ifp->state_lock);
917
918 if (state == INET6_IFADDR_STATE_DEAD)
919 goto out;
920
921 spin_lock_bh(&addrconf_hash_lock);
922 hlist_del_init_rcu(&ifp->addr_lst);
923 spin_unlock_bh(&addrconf_hash_lock);
924
925 write_lock_bh(&idev->lock);
926
927 if (ifp->flags&IFA_F_TEMPORARY) {
928 list_del(&ifp->tmp_list);
929 if (ifp->ifpub) {
930 in6_ifa_put(ifp->ifpub);
931 ifp->ifpub = NULL;
932 }
933 __in6_ifa_put(ifp);
934 }
935
936 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
937 if (ifa == ifp) {
938 list_del_init(&ifp->if_list);
939 __in6_ifa_put(ifp);
940
941 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
942 break;
943 deleted = 1;
944 continue;
945 } else if (ifp->flags & IFA_F_PERMANENT) {
946 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
947 ifp->prefix_len)) {
948 if (ifa->flags & IFA_F_PERMANENT) {
949 onlink = 1;
950 if (deleted)
951 break;
952 } else {
953 unsigned long lifetime;
954
955 if (!onlink)
956 onlink = -1;
957
958 spin_lock(&ifa->lock);
959
960 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
961 /*
962 * Note: Because this address is
963 * not permanent, lifetime <
964 * LONG_MAX / HZ here.
965 */
966 if (time_before(expires,
967 ifa->tstamp + lifetime * HZ))
968 expires = ifa->tstamp + lifetime * HZ;
969 spin_unlock(&ifa->lock);
970 }
971 }
972 }
973 }
974 write_unlock_bh(&idev->lock);
975
976 addrconf_del_dad_timer(ifp);
977
978 ipv6_ifa_notify(RTM_DELADDR, ifp);
979
980 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
981
982 /*
983 * Purge or update corresponding prefix
984 *
985 * 1) we don't purge prefix here if address was not permanent.
986 * prefix is managed by its own lifetime.
987 * 2) if there are no addresses, delete prefix.
988 * 3) if there are still other permanent address(es),
989 * corresponding prefix is still permanent.
990 * 4) otherwise, update prefix lifetime to the
991 * longest valid lifetime among the corresponding
992 * addresses on the device.
993 * Note: subsequent RA will update lifetime.
994 *
995 * --yoshfuji
996 */
997 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
998 struct rt6_info *rt;
999
1000 rt = addrconf_get_prefix_route(&ifp->addr,
1001 ifp->prefix_len,
1002 ifp->idev->dev,
1003 0, RTF_GATEWAY | RTF_DEFAULT);
1004
1005 if (rt) {
1006 if (onlink == 0) {
1007 ip6_del_rt(rt);
1008 rt = NULL;
1009 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1010 rt6_set_expires(rt, expires);
1011 }
1012 }
1013 ip6_rt_put(rt);
1014 }
1015
1016 /* clean up prefsrc entries */
1017 rt6_remove_prefsrc(ifp);
1018 out:
1019 in6_ifa_put(ifp);
1020 }
1021
1022 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1023 {
1024 struct inet6_dev *idev = ifp->idev;
1025 struct in6_addr addr, *tmpaddr;
1026 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1027 unsigned long regen_advance;
1028 int tmp_plen;
1029 int ret = 0;
1030 u32 addr_flags;
1031 unsigned long now = jiffies;
1032
1033 write_lock_bh(&idev->lock);
1034 if (ift) {
1035 spin_lock_bh(&ift->lock);
1036 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1037 spin_unlock_bh(&ift->lock);
1038 tmpaddr = &addr;
1039 } else {
1040 tmpaddr = NULL;
1041 }
1042 retry:
1043 in6_dev_hold(idev);
1044 if (idev->cnf.use_tempaddr <= 0) {
1045 write_unlock_bh(&idev->lock);
1046 pr_info("%s: use_tempaddr is disabled\n", __func__);
1047 in6_dev_put(idev);
1048 ret = -1;
1049 goto out;
1050 }
1051 spin_lock_bh(&ifp->lock);
1052 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1053 idev->cnf.use_tempaddr = -1; /*XXX*/
1054 spin_unlock_bh(&ifp->lock);
1055 write_unlock_bh(&idev->lock);
1056 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1057 __func__);
1058 in6_dev_put(idev);
1059 ret = -1;
1060 goto out;
1061 }
1062 in6_ifa_hold(ifp);
1063 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1064 __ipv6_try_regen_rndid(idev, tmpaddr);
1065 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1066 age = (now - ifp->tstamp) / HZ;
1067 tmp_valid_lft = min_t(__u32,
1068 ifp->valid_lft,
1069 idev->cnf.temp_valid_lft + age);
1070 tmp_prefered_lft = min_t(__u32,
1071 ifp->prefered_lft,
1072 idev->cnf.temp_prefered_lft + age -
1073 idev->cnf.max_desync_factor);
1074 tmp_plen = ifp->prefix_len;
1075 tmp_tstamp = ifp->tstamp;
1076 spin_unlock_bh(&ifp->lock);
1077
1078 regen_advance = idev->cnf.regen_max_retry *
1079 idev->cnf.dad_transmits *
1080 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1081 write_unlock_bh(&idev->lock);
1082
1083 /* A temporary address is created only if this calculated Preferred
1084 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1085 * an implementation must not create a temporary address with a zero
1086 * Preferred Lifetime.
1087 */
1088 if (tmp_prefered_lft <= regen_advance) {
1089 in6_ifa_put(ifp);
1090 in6_dev_put(idev);
1091 ret = -1;
1092 goto out;
1093 }
1094
1095 addr_flags = IFA_F_TEMPORARY;
1096 /* set in addrconf_prefix_rcv() */
1097 if (ifp->flags & IFA_F_OPTIMISTIC)
1098 addr_flags |= IFA_F_OPTIMISTIC;
1099
1100 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1101 ipv6_addr_scope(&addr), addr_flags,
1102 tmp_valid_lft, tmp_prefered_lft);
1103 if (IS_ERR(ift)) {
1104 in6_ifa_put(ifp);
1105 in6_dev_put(idev);
1106 pr_info("%s: retry temporary address regeneration\n", __func__);
1107 tmpaddr = &addr;
1108 write_lock_bh(&idev->lock);
1109 goto retry;
1110 }
1111
1112 spin_lock_bh(&ift->lock);
1113 ift->ifpub = ifp;
1114 ift->cstamp = now;
1115 ift->tstamp = tmp_tstamp;
1116 spin_unlock_bh(&ift->lock);
1117
1118 addrconf_dad_start(ift);
1119 in6_ifa_put(ift);
1120 in6_dev_put(idev);
1121 out:
1122 return ret;
1123 }
1124
1125 /*
1126 * Choose an appropriate source address (RFC3484)
1127 */
1128 enum {
1129 IPV6_SADDR_RULE_INIT = 0,
1130 IPV6_SADDR_RULE_LOCAL,
1131 IPV6_SADDR_RULE_SCOPE,
1132 IPV6_SADDR_RULE_PREFERRED,
1133 #ifdef CONFIG_IPV6_MIP6
1134 IPV6_SADDR_RULE_HOA,
1135 #endif
1136 IPV6_SADDR_RULE_OIF,
1137 IPV6_SADDR_RULE_LABEL,
1138 IPV6_SADDR_RULE_PRIVACY,
1139 IPV6_SADDR_RULE_ORCHID,
1140 IPV6_SADDR_RULE_PREFIX,
1141 IPV6_SADDR_RULE_MAX
1142 };
1143
1144 struct ipv6_saddr_score {
1145 int rule;
1146 int addr_type;
1147 struct inet6_ifaddr *ifa;
1148 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1149 int scopedist;
1150 int matchlen;
1151 };
1152
1153 struct ipv6_saddr_dst {
1154 const struct in6_addr *addr;
1155 int ifindex;
1156 int scope;
1157 int label;
1158 unsigned int prefs;
1159 };
1160
1161 static inline int ipv6_saddr_preferred(int type)
1162 {
1163 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1164 return 1;
1165 return 0;
1166 }
1167
1168 static int ipv6_get_saddr_eval(struct net *net,
1169 struct ipv6_saddr_score *score,
1170 struct ipv6_saddr_dst *dst,
1171 int i)
1172 {
1173 int ret;
1174
1175 if (i <= score->rule) {
1176 switch (i) {
1177 case IPV6_SADDR_RULE_SCOPE:
1178 ret = score->scopedist;
1179 break;
1180 case IPV6_SADDR_RULE_PREFIX:
1181 ret = score->matchlen;
1182 break;
1183 default:
1184 ret = !!test_bit(i, score->scorebits);
1185 }
1186 goto out;
1187 }
1188
1189 switch (i) {
1190 case IPV6_SADDR_RULE_INIT:
1191 /* Rule 0: remember if hiscore is not ready yet */
1192 ret = !!score->ifa;
1193 break;
1194 case IPV6_SADDR_RULE_LOCAL:
1195 /* Rule 1: Prefer same address */
1196 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1197 break;
1198 case IPV6_SADDR_RULE_SCOPE:
1199 /* Rule 2: Prefer appropriate scope
1200 *
1201 * ret
1202 * ^
1203 * -1 | d 15
1204 * ---+--+-+---> scope
1205 * |
1206 * | d is scope of the destination.
1207 * B-d | \
1208 * | \ <- smaller scope is better if
1209 * B-15 | \ if scope is enough for destination.
1210 * | ret = B - scope (-1 <= scope >= d <= 15).
1211 * d-C-1 | /
1212 * |/ <- greater is better
1213 * -C / if scope is not enough for destination.
1214 * /| ret = scope - C (-1 <= d < scope <= 15).
1215 *
1216 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1217 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1218 * Assume B = 0 and we get C > 29.
1219 */
1220 ret = __ipv6_addr_src_scope(score->addr_type);
1221 if (ret >= dst->scope)
1222 ret = -ret;
1223 else
1224 ret -= 128; /* 30 is enough */
1225 score->scopedist = ret;
1226 break;
1227 case IPV6_SADDR_RULE_PREFERRED:
1228 /* Rule 3: Avoid deprecated and optimistic addresses */
1229 ret = ipv6_saddr_preferred(score->addr_type) ||
1230 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1231 break;
1232 #ifdef CONFIG_IPV6_MIP6
1233 case IPV6_SADDR_RULE_HOA:
1234 {
1235 /* Rule 4: Prefer home address */
1236 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1237 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1238 break;
1239 }
1240 #endif
1241 case IPV6_SADDR_RULE_OIF:
1242 /* Rule 5: Prefer outgoing interface */
1243 ret = (!dst->ifindex ||
1244 dst->ifindex == score->ifa->idev->dev->ifindex);
1245 break;
1246 case IPV6_SADDR_RULE_LABEL:
1247 /* Rule 6: Prefer matching label */
1248 ret = ipv6_addr_label(net,
1249 &score->ifa->addr, score->addr_type,
1250 score->ifa->idev->dev->ifindex) == dst->label;
1251 break;
1252 case IPV6_SADDR_RULE_PRIVACY:
1253 {
1254 /* Rule 7: Prefer public address
1255 * Note: prefer temporary address if use_tempaddr >= 2
1256 */
1257 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1258 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1259 score->ifa->idev->cnf.use_tempaddr >= 2;
1260 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1261 break;
1262 }
1263 case IPV6_SADDR_RULE_ORCHID:
1264 /* Rule 8-: Prefer ORCHID vs ORCHID or
1265 * non-ORCHID vs non-ORCHID
1266 */
1267 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1268 ipv6_addr_orchid(dst->addr));
1269 break;
1270 case IPV6_SADDR_RULE_PREFIX:
1271 /* Rule 8: Use longest matching prefix */
1272 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1273 if (ret > score->ifa->prefix_len)
1274 ret = score->ifa->prefix_len;
1275 score->matchlen = ret;
1276 break;
1277 default:
1278 ret = 0;
1279 }
1280
1281 if (ret)
1282 __set_bit(i, score->scorebits);
1283 score->rule = i;
1284 out:
1285 return ret;
1286 }
1287
1288 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1289 const struct in6_addr *daddr, unsigned int prefs,
1290 struct in6_addr *saddr)
1291 {
1292 struct ipv6_saddr_score scores[2],
1293 *score = &scores[0], *hiscore = &scores[1];
1294 struct ipv6_saddr_dst dst;
1295 struct net_device *dev;
1296 int dst_type;
1297
1298 dst_type = __ipv6_addr_type(daddr);
1299 dst.addr = daddr;
1300 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1301 dst.scope = __ipv6_addr_src_scope(dst_type);
1302 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1303 dst.prefs = prefs;
1304
1305 hiscore->rule = -1;
1306 hiscore->ifa = NULL;
1307
1308 rcu_read_lock();
1309
1310 for_each_netdev_rcu(net, dev) {
1311 struct inet6_dev *idev;
1312
1313 /* Candidate Source Address (section 4)
1314 * - multicast and link-local destination address,
1315 * the set of candidate source address MUST only
1316 * include addresses assigned to interfaces
1317 * belonging to the same link as the outgoing
1318 * interface.
1319 * (- For site-local destination addresses, the
1320 * set of candidate source addresses MUST only
1321 * include addresses assigned to interfaces
1322 * belonging to the same site as the outgoing
1323 * interface.)
1324 */
1325 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1326 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1327 dst.ifindex && dev->ifindex != dst.ifindex)
1328 continue;
1329
1330 idev = __in6_dev_get(dev);
1331 if (!idev)
1332 continue;
1333
1334 read_lock_bh(&idev->lock);
1335 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1336 int i;
1337
1338 /*
1339 * - Tentative Address (RFC2462 section 5.4)
1340 * - A tentative address is not considered
1341 * "assigned to an interface" in the traditional
1342 * sense, unless it is also flagged as optimistic.
1343 * - Candidate Source Address (section 4)
1344 * - In any case, anycast addresses, multicast
1345 * addresses, and the unspecified address MUST
1346 * NOT be included in a candidate set.
1347 */
1348 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1349 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1350 continue;
1351
1352 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1353
1354 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1355 score->addr_type & IPV6_ADDR_MULTICAST)) {
1356 LIMIT_NETDEBUG(KERN_DEBUG
1357 "ADDRCONF: unspecified / multicast address "
1358 "assigned as unicast address on %s",
1359 dev->name);
1360 continue;
1361 }
1362
1363 score->rule = -1;
1364 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1365
1366 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1367 int minihiscore, miniscore;
1368
1369 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1370 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1371
1372 if (minihiscore > miniscore) {
1373 if (i == IPV6_SADDR_RULE_SCOPE &&
1374 score->scopedist > 0) {
1375 /*
1376 * special case:
1377 * each remaining entry
1378 * has too small (not enough)
1379 * scope, because ifa entries
1380 * are sorted by their scope
1381 * values.
1382 */
1383 goto try_nextdev;
1384 }
1385 break;
1386 } else if (minihiscore < miniscore) {
1387 if (hiscore->ifa)
1388 in6_ifa_put(hiscore->ifa);
1389
1390 in6_ifa_hold(score->ifa);
1391
1392 swap(hiscore, score);
1393
1394 /* restore our iterator */
1395 score->ifa = hiscore->ifa;
1396
1397 break;
1398 }
1399 }
1400 }
1401 try_nextdev:
1402 read_unlock_bh(&idev->lock);
1403 }
1404 rcu_read_unlock();
1405
1406 if (!hiscore->ifa)
1407 return -EADDRNOTAVAIL;
1408
1409 *saddr = hiscore->ifa->addr;
1410 in6_ifa_put(hiscore->ifa);
1411 return 0;
1412 }
1413 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1414
1415 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1416 u32 banned_flags)
1417 {
1418 struct inet6_ifaddr *ifp;
1419 int err = -EADDRNOTAVAIL;
1420
1421 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1422 if (ifp->scope == IFA_LINK &&
1423 !(ifp->flags & banned_flags)) {
1424 *addr = ifp->addr;
1425 err = 0;
1426 break;
1427 }
1428 }
1429 return err;
1430 }
1431
1432 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1433 u32 banned_flags)
1434 {
1435 struct inet6_dev *idev;
1436 int err = -EADDRNOTAVAIL;
1437
1438 rcu_read_lock();
1439 idev = __in6_dev_get(dev);
1440 if (idev) {
1441 read_lock_bh(&idev->lock);
1442 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1443 read_unlock_bh(&idev->lock);
1444 }
1445 rcu_read_unlock();
1446 return err;
1447 }
1448
1449 static int ipv6_count_addresses(struct inet6_dev *idev)
1450 {
1451 int cnt = 0;
1452 struct inet6_ifaddr *ifp;
1453
1454 read_lock_bh(&idev->lock);
1455 list_for_each_entry(ifp, &idev->addr_list, if_list)
1456 cnt++;
1457 read_unlock_bh(&idev->lock);
1458 return cnt;
1459 }
1460
1461 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1462 const struct net_device *dev, int strict)
1463 {
1464 struct inet6_ifaddr *ifp;
1465 unsigned int hash = inet6_addr_hash(addr);
1466
1467 rcu_read_lock_bh();
1468 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1469 if (!net_eq(dev_net(ifp->idev->dev), net))
1470 continue;
1471 if (ipv6_addr_equal(&ifp->addr, addr) &&
1472 !(ifp->flags&IFA_F_TENTATIVE) &&
1473 (dev == NULL || ifp->idev->dev == dev ||
1474 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1475 rcu_read_unlock_bh();
1476 return 1;
1477 }
1478 }
1479
1480 rcu_read_unlock_bh();
1481 return 0;
1482 }
1483 EXPORT_SYMBOL(ipv6_chk_addr);
1484
1485 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1486 struct net_device *dev)
1487 {
1488 unsigned int hash = inet6_addr_hash(addr);
1489 struct inet6_ifaddr *ifp;
1490
1491 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1492 if (!net_eq(dev_net(ifp->idev->dev), net))
1493 continue;
1494 if (ipv6_addr_equal(&ifp->addr, addr)) {
1495 if (dev == NULL || ifp->idev->dev == dev)
1496 return true;
1497 }
1498 }
1499 return false;
1500 }
1501
1502 /* Compares an address/prefix_len with addresses on device @dev.
1503 * If one is found it returns true.
1504 */
1505 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1506 const unsigned int prefix_len, struct net_device *dev)
1507 {
1508 struct inet6_dev *idev;
1509 struct inet6_ifaddr *ifa;
1510 bool ret = false;
1511
1512 rcu_read_lock();
1513 idev = __in6_dev_get(dev);
1514 if (idev) {
1515 read_lock_bh(&idev->lock);
1516 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1517 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1518 if (ret)
1519 break;
1520 }
1521 read_unlock_bh(&idev->lock);
1522 }
1523 rcu_read_unlock();
1524
1525 return ret;
1526 }
1527 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1528
1529 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1530 {
1531 struct inet6_dev *idev;
1532 struct inet6_ifaddr *ifa;
1533 int onlink;
1534
1535 onlink = 0;
1536 rcu_read_lock();
1537 idev = __in6_dev_get(dev);
1538 if (idev) {
1539 read_lock_bh(&idev->lock);
1540 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1541 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1542 ifa->prefix_len);
1543 if (onlink)
1544 break;
1545 }
1546 read_unlock_bh(&idev->lock);
1547 }
1548 rcu_read_unlock();
1549 return onlink;
1550 }
1551 EXPORT_SYMBOL(ipv6_chk_prefix);
1552
1553 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1554 struct net_device *dev, int strict)
1555 {
1556 struct inet6_ifaddr *ifp, *result = NULL;
1557 unsigned int hash = inet6_addr_hash(addr);
1558
1559 rcu_read_lock_bh();
1560 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1561 if (!net_eq(dev_net(ifp->idev->dev), net))
1562 continue;
1563 if (ipv6_addr_equal(&ifp->addr, addr)) {
1564 if (dev == NULL || ifp->idev->dev == dev ||
1565 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1566 result = ifp;
1567 in6_ifa_hold(ifp);
1568 break;
1569 }
1570 }
1571 }
1572 rcu_read_unlock_bh();
1573
1574 return result;
1575 }
1576
1577 /* Gets referenced address, destroys ifaddr */
1578
1579 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1580 {
1581 if (ifp->flags&IFA_F_PERMANENT) {
1582 spin_lock_bh(&ifp->lock);
1583 addrconf_del_dad_timer(ifp);
1584 ifp->flags |= IFA_F_TENTATIVE;
1585 if (dad_failed)
1586 ifp->flags |= IFA_F_DADFAILED;
1587 spin_unlock_bh(&ifp->lock);
1588 if (dad_failed)
1589 ipv6_ifa_notify(0, ifp);
1590 in6_ifa_put(ifp);
1591 } else if (ifp->flags&IFA_F_TEMPORARY) {
1592 struct inet6_ifaddr *ifpub;
1593 spin_lock_bh(&ifp->lock);
1594 ifpub = ifp->ifpub;
1595 if (ifpub) {
1596 in6_ifa_hold(ifpub);
1597 spin_unlock_bh(&ifp->lock);
1598 ipv6_create_tempaddr(ifpub, ifp);
1599 in6_ifa_put(ifpub);
1600 } else {
1601 spin_unlock_bh(&ifp->lock);
1602 }
1603 ipv6_del_addr(ifp);
1604 } else
1605 ipv6_del_addr(ifp);
1606 }
1607
1608 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1609 {
1610 int err = -ENOENT;
1611
1612 spin_lock(&ifp->state_lock);
1613 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1614 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1615 err = 0;
1616 }
1617 spin_unlock(&ifp->state_lock);
1618
1619 return err;
1620 }
1621
1622 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1623 {
1624 struct inet6_dev *idev = ifp->idev;
1625
1626 if (addrconf_dad_end(ifp)) {
1627 in6_ifa_put(ifp);
1628 return;
1629 }
1630
1631 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1632 ifp->idev->dev->name, &ifp->addr);
1633
1634 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1635 struct in6_addr addr;
1636
1637 addr.s6_addr32[0] = htonl(0xfe800000);
1638 addr.s6_addr32[1] = 0;
1639
1640 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1641 ipv6_addr_equal(&ifp->addr, &addr)) {
1642 /* DAD failed for link-local based on MAC address */
1643 idev->cnf.disable_ipv6 = 1;
1644
1645 pr_info("%s: IPv6 being disabled!\n",
1646 ifp->idev->dev->name);
1647 }
1648 }
1649
1650 addrconf_dad_stop(ifp, 1);
1651 }
1652
1653 /* Join to solicited addr multicast group. */
1654
1655 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1656 {
1657 struct in6_addr maddr;
1658
1659 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1660 return;
1661
1662 addrconf_addr_solict_mult(addr, &maddr);
1663 ipv6_dev_mc_inc(dev, &maddr);
1664 }
1665
1666 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1667 {
1668 struct in6_addr maddr;
1669
1670 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1671 return;
1672
1673 addrconf_addr_solict_mult(addr, &maddr);
1674 __ipv6_dev_mc_dec(idev, &maddr);
1675 }
1676
1677 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1678 {
1679 struct in6_addr addr;
1680 if (ifp->prefix_len >= 127) /* RFC 6164 */
1681 return;
1682 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1683 if (ipv6_addr_any(&addr))
1684 return;
1685 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1686 }
1687
1688 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1689 {
1690 struct in6_addr addr;
1691 if (ifp->prefix_len >= 127) /* RFC 6164 */
1692 return;
1693 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1694 if (ipv6_addr_any(&addr))
1695 return;
1696 __ipv6_dev_ac_dec(ifp->idev, &addr);
1697 }
1698
1699 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1700 {
1701 if (dev->addr_len != ETH_ALEN)
1702 return -1;
1703 memcpy(eui, dev->dev_addr, 3);
1704 memcpy(eui + 5, dev->dev_addr + 3, 3);
1705
1706 /*
1707 * The zSeries OSA network cards can be shared among various
1708 * OS instances, but the OSA cards have only one MAC address.
1709 * This leads to duplicate address conflicts in conjunction
1710 * with IPv6 if more than one instance uses the same card.
1711 *
1712 * The driver for these cards can deliver a unique 16-bit
1713 * identifier for each instance sharing the same card. It is
1714 * placed instead of 0xFFFE in the interface identifier. The
1715 * "u" bit of the interface identifier is not inverted in this
1716 * case. Hence the resulting interface identifier has local
1717 * scope according to RFC2373.
1718 */
1719 if (dev->dev_id) {
1720 eui[3] = (dev->dev_id >> 8) & 0xFF;
1721 eui[4] = dev->dev_id & 0xFF;
1722 } else {
1723 eui[3] = 0xFF;
1724 eui[4] = 0xFE;
1725 eui[0] ^= 2;
1726 }
1727 return 0;
1728 }
1729
1730 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1731 {
1732 if (dev->addr_len != IEEE802154_ADDR_LEN)
1733 return -1;
1734 memcpy(eui, dev->dev_addr, 8);
1735 eui[0] ^= 2;
1736 return 0;
1737 }
1738
1739 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1740 {
1741 union fwnet_hwaddr *ha;
1742
1743 if (dev->addr_len != FWNET_ALEN)
1744 return -1;
1745
1746 ha = (union fwnet_hwaddr *)dev->dev_addr;
1747
1748 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1749 eui[0] ^= 2;
1750 return 0;
1751 }
1752
1753 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1754 {
1755 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1756 if (dev->addr_len != ARCNET_ALEN)
1757 return -1;
1758 memset(eui, 0, 7);
1759 eui[7] = *(u8 *)dev->dev_addr;
1760 return 0;
1761 }
1762
1763 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1764 {
1765 if (dev->addr_len != INFINIBAND_ALEN)
1766 return -1;
1767 memcpy(eui, dev->dev_addr + 12, 8);
1768 eui[0] |= 2;
1769 return 0;
1770 }
1771
1772 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1773 {
1774 if (addr == 0)
1775 return -1;
1776 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1777 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1778 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1779 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1780 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1781 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1782 eui[1] = 0;
1783 eui[2] = 0x5E;
1784 eui[3] = 0xFE;
1785 memcpy(eui + 4, &addr, 4);
1786 return 0;
1787 }
1788
1789 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1790 {
1791 if (dev->priv_flags & IFF_ISATAP)
1792 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1793 return -1;
1794 }
1795
1796 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1797 {
1798 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1799 }
1800
1801 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1802 {
1803 memcpy(eui, dev->perm_addr, 3);
1804 memcpy(eui + 5, dev->perm_addr + 3, 3);
1805 eui[3] = 0xFF;
1806 eui[4] = 0xFE;
1807 eui[0] ^= 2;
1808 return 0;
1809 }
1810
1811 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1812 {
1813 switch (dev->type) {
1814 case ARPHRD_ETHER:
1815 case ARPHRD_FDDI:
1816 return addrconf_ifid_eui48(eui, dev);
1817 case ARPHRD_ARCNET:
1818 return addrconf_ifid_arcnet(eui, dev);
1819 case ARPHRD_INFINIBAND:
1820 return addrconf_ifid_infiniband(eui, dev);
1821 case ARPHRD_SIT:
1822 return addrconf_ifid_sit(eui, dev);
1823 case ARPHRD_IPGRE:
1824 return addrconf_ifid_gre(eui, dev);
1825 case ARPHRD_6LOWPAN:
1826 case ARPHRD_IEEE802154:
1827 return addrconf_ifid_eui64(eui, dev);
1828 case ARPHRD_IEEE1394:
1829 return addrconf_ifid_ieee1394(eui, dev);
1830 case ARPHRD_TUNNEL6:
1831 return addrconf_ifid_ip6tnl(eui, dev);
1832 }
1833 return -1;
1834 }
1835
1836 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1837 {
1838 int err = -1;
1839 struct inet6_ifaddr *ifp;
1840
1841 read_lock_bh(&idev->lock);
1842 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1843 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1844 memcpy(eui, ifp->addr.s6_addr+8, 8);
1845 err = 0;
1846 break;
1847 }
1848 }
1849 read_unlock_bh(&idev->lock);
1850 return err;
1851 }
1852
1853 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1854 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1855 {
1856 regen:
1857 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1858 idev->rndid[0] &= ~0x02;
1859
1860 /*
1861 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1862 * check if generated address is not inappropriate
1863 *
1864 * - Reserved subnet anycast (RFC 2526)
1865 * 11111101 11....11 1xxxxxxx
1866 * - ISATAP (RFC4214) 6.1
1867 * 00-00-5E-FE-xx-xx-xx-xx
1868 * - value 0
1869 * - XXX: already assigned to an address on the device
1870 */
1871 if (idev->rndid[0] == 0xfd &&
1872 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1873 (idev->rndid[7]&0x80))
1874 goto regen;
1875 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1876 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1877 goto regen;
1878 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1879 goto regen;
1880 }
1881 }
1882
1883 static void ipv6_regen_rndid(unsigned long data)
1884 {
1885 struct inet6_dev *idev = (struct inet6_dev *) data;
1886 unsigned long expires;
1887
1888 rcu_read_lock_bh();
1889 write_lock_bh(&idev->lock);
1890
1891 if (idev->dead)
1892 goto out;
1893
1894 __ipv6_regen_rndid(idev);
1895
1896 expires = jiffies +
1897 idev->cnf.temp_prefered_lft * HZ -
1898 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1899 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
1900 idev->cnf.max_desync_factor * HZ;
1901 if (time_before(expires, jiffies)) {
1902 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1903 __func__, idev->dev->name);
1904 goto out;
1905 }
1906
1907 if (!mod_timer(&idev->regen_timer, expires))
1908 in6_dev_hold(idev);
1909
1910 out:
1911 write_unlock_bh(&idev->lock);
1912 rcu_read_unlock_bh();
1913 in6_dev_put(idev);
1914 }
1915
1916 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1917 {
1918 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1919 __ipv6_regen_rndid(idev);
1920 }
1921
1922 /*
1923 * Add prefix route.
1924 */
1925
1926 static void
1927 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1928 unsigned long expires, u32 flags)
1929 {
1930 struct fib6_config cfg = {
1931 .fc_table = RT6_TABLE_PREFIX,
1932 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1933 .fc_ifindex = dev->ifindex,
1934 .fc_expires = expires,
1935 .fc_dst_len = plen,
1936 .fc_flags = RTF_UP | flags,
1937 .fc_nlinfo.nl_net = dev_net(dev),
1938 .fc_protocol = RTPROT_KERNEL,
1939 };
1940
1941 cfg.fc_dst = *pfx;
1942
1943 /* Prevent useless cloning on PtP SIT.
1944 This thing is done here expecting that the whole
1945 class of non-broadcast devices need not cloning.
1946 */
1947 #if IS_ENABLED(CONFIG_IPV6_SIT)
1948 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1949 cfg.fc_flags |= RTF_NONEXTHOP;
1950 #endif
1951
1952 ip6_route_add(&cfg);
1953 }
1954
1955
1956 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1957 int plen,
1958 const struct net_device *dev,
1959 u32 flags, u32 noflags)
1960 {
1961 struct fib6_node *fn;
1962 struct rt6_info *rt = NULL;
1963 struct fib6_table *table;
1964
1965 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1966 if (table == NULL)
1967 return NULL;
1968
1969 read_lock_bh(&table->tb6_lock);
1970 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1971 if (!fn)
1972 goto out;
1973 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1974 if (rt->dst.dev->ifindex != dev->ifindex)
1975 continue;
1976 if ((rt->rt6i_flags & flags) != flags)
1977 continue;
1978 if ((rt->rt6i_flags & noflags) != 0)
1979 continue;
1980 dst_hold(&rt->dst);
1981 break;
1982 }
1983 out:
1984 read_unlock_bh(&table->tb6_lock);
1985 return rt;
1986 }
1987
1988
1989 /* Create "default" multicast route to the interface */
1990
1991 static void addrconf_add_mroute(struct net_device *dev)
1992 {
1993 struct fib6_config cfg = {
1994 .fc_table = RT6_TABLE_LOCAL,
1995 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1996 .fc_ifindex = dev->ifindex,
1997 .fc_dst_len = 8,
1998 .fc_flags = RTF_UP,
1999 .fc_nlinfo.nl_net = dev_net(dev),
2000 };
2001
2002 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2003
2004 ip6_route_add(&cfg);
2005 }
2006
2007 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2008 {
2009 struct inet6_dev *idev;
2010
2011 ASSERT_RTNL();
2012
2013 idev = ipv6_find_idev(dev);
2014 if (!idev)
2015 return ERR_PTR(-ENOBUFS);
2016
2017 if (idev->cnf.disable_ipv6)
2018 return ERR_PTR(-EACCES);
2019
2020 /* Add default multicast route */
2021 if (!(dev->flags & IFF_LOOPBACK))
2022 addrconf_add_mroute(dev);
2023
2024 return idev;
2025 }
2026
2027 static void manage_tempaddrs(struct inet6_dev *idev,
2028 struct inet6_ifaddr *ifp,
2029 __u32 valid_lft, __u32 prefered_lft,
2030 bool create, unsigned long now)
2031 {
2032 u32 flags;
2033 struct inet6_ifaddr *ift;
2034
2035 read_lock_bh(&idev->lock);
2036 /* update all temporary addresses in the list */
2037 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2038 int age, max_valid, max_prefered;
2039
2040 if (ifp != ift->ifpub)
2041 continue;
2042
2043 /* RFC 4941 section 3.3:
2044 * If a received option will extend the lifetime of a public
2045 * address, the lifetimes of temporary addresses should
2046 * be extended, subject to the overall constraint that no
2047 * temporary addresses should ever remain "valid" or "preferred"
2048 * for a time longer than (TEMP_VALID_LIFETIME) or
2049 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2050 */
2051 age = (now - ift->cstamp) / HZ;
2052 max_valid = idev->cnf.temp_valid_lft - age;
2053 if (max_valid < 0)
2054 max_valid = 0;
2055
2056 max_prefered = idev->cnf.temp_prefered_lft -
2057 idev->cnf.max_desync_factor - age;
2058 if (max_prefered < 0)
2059 max_prefered = 0;
2060
2061 if (valid_lft > max_valid)
2062 valid_lft = max_valid;
2063
2064 if (prefered_lft > max_prefered)
2065 prefered_lft = max_prefered;
2066
2067 spin_lock(&ift->lock);
2068 flags = ift->flags;
2069 ift->valid_lft = valid_lft;
2070 ift->prefered_lft = prefered_lft;
2071 ift->tstamp = now;
2072 if (prefered_lft > 0)
2073 ift->flags &= ~IFA_F_DEPRECATED;
2074
2075 spin_unlock(&ift->lock);
2076 if (!(flags&IFA_F_TENTATIVE))
2077 ipv6_ifa_notify(0, ift);
2078 }
2079
2080 if ((create || list_empty(&idev->tempaddr_list)) &&
2081 idev->cnf.use_tempaddr > 0) {
2082 /* When a new public address is created as described
2083 * in [ADDRCONF], also create a new temporary address.
2084 * Also create a temporary address if it's enabled but
2085 * no temporary address currently exists.
2086 */
2087 read_unlock_bh(&idev->lock);
2088 ipv6_create_tempaddr(ifp, NULL);
2089 } else {
2090 read_unlock_bh(&idev->lock);
2091 }
2092 }
2093
2094 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2095 {
2096 struct prefix_info *pinfo;
2097 __u32 valid_lft;
2098 __u32 prefered_lft;
2099 int addr_type;
2100 struct inet6_dev *in6_dev;
2101 struct net *net = dev_net(dev);
2102
2103 pinfo = (struct prefix_info *) opt;
2104
2105 if (len < sizeof(struct prefix_info)) {
2106 ADBG("addrconf: prefix option too short\n");
2107 return;
2108 }
2109
2110 /*
2111 * Validation checks ([ADDRCONF], page 19)
2112 */
2113
2114 addr_type = ipv6_addr_type(&pinfo->prefix);
2115
2116 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2117 return;
2118
2119 valid_lft = ntohl(pinfo->valid);
2120 prefered_lft = ntohl(pinfo->prefered);
2121
2122 if (prefered_lft > valid_lft) {
2123 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2124 return;
2125 }
2126
2127 in6_dev = in6_dev_get(dev);
2128
2129 if (in6_dev == NULL) {
2130 net_dbg_ratelimited("addrconf: device %s not configured\n",
2131 dev->name);
2132 return;
2133 }
2134
2135 /*
2136 * Two things going on here:
2137 * 1) Add routes for on-link prefixes
2138 * 2) Configure prefixes with the auto flag set
2139 */
2140
2141 if (pinfo->onlink) {
2142 struct rt6_info *rt;
2143 unsigned long rt_expires;
2144
2145 /* Avoid arithmetic overflow. Really, we could
2146 * save rt_expires in seconds, likely valid_lft,
2147 * but it would require division in fib gc, that it
2148 * not good.
2149 */
2150 if (HZ > USER_HZ)
2151 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2152 else
2153 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2154
2155 if (addrconf_finite_timeout(rt_expires))
2156 rt_expires *= HZ;
2157
2158 rt = addrconf_get_prefix_route(&pinfo->prefix,
2159 pinfo->prefix_len,
2160 dev,
2161 RTF_ADDRCONF | RTF_PREFIX_RT,
2162 RTF_GATEWAY | RTF_DEFAULT);
2163
2164 if (rt) {
2165 /* Autoconf prefix route */
2166 if (valid_lft == 0) {
2167 ip6_del_rt(rt);
2168 rt = NULL;
2169 } else if (addrconf_finite_timeout(rt_expires)) {
2170 /* not infinity */
2171 rt6_set_expires(rt, jiffies + rt_expires);
2172 } else {
2173 rt6_clean_expires(rt);
2174 }
2175 } else if (valid_lft) {
2176 clock_t expires = 0;
2177 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2178 if (addrconf_finite_timeout(rt_expires)) {
2179 /* not infinity */
2180 flags |= RTF_EXPIRES;
2181 expires = jiffies_to_clock_t(rt_expires);
2182 }
2183 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2184 dev, expires, flags);
2185 }
2186 ip6_rt_put(rt);
2187 }
2188
2189 /* Try to figure out our local address for this prefix */
2190
2191 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2192 struct inet6_ifaddr *ifp;
2193 struct in6_addr addr;
2194 int create = 0, update_lft = 0;
2195 bool tokenized = false;
2196
2197 if (pinfo->prefix_len == 64) {
2198 memcpy(&addr, &pinfo->prefix, 8);
2199
2200 if (!ipv6_addr_any(&in6_dev->token)) {
2201 read_lock_bh(&in6_dev->lock);
2202 memcpy(addr.s6_addr + 8,
2203 in6_dev->token.s6_addr + 8, 8);
2204 read_unlock_bh(&in6_dev->lock);
2205 tokenized = true;
2206 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2207 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2208 in6_dev_put(in6_dev);
2209 return;
2210 }
2211 goto ok;
2212 }
2213 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2214 pinfo->prefix_len);
2215 in6_dev_put(in6_dev);
2216 return;
2217
2218 ok:
2219
2220 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2221
2222 if (ifp == NULL && valid_lft) {
2223 int max_addresses = in6_dev->cnf.max_addresses;
2224 u32 addr_flags = 0;
2225
2226 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2227 if (in6_dev->cnf.optimistic_dad &&
2228 !net->ipv6.devconf_all->forwarding && sllao)
2229 addr_flags = IFA_F_OPTIMISTIC;
2230 #endif
2231
2232 /* Do not allow to create too much of autoconfigured
2233 * addresses; this would be too easy way to crash kernel.
2234 */
2235 if (!max_addresses ||
2236 ipv6_count_addresses(in6_dev) < max_addresses)
2237 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2238 pinfo->prefix_len,
2239 addr_type&IPV6_ADDR_SCOPE_MASK,
2240 addr_flags, valid_lft,
2241 prefered_lft);
2242
2243 if (IS_ERR_OR_NULL(ifp)) {
2244 in6_dev_put(in6_dev);
2245 return;
2246 }
2247
2248 ifp->flags |= IFA_F_MANAGETEMPADDR;
2249 update_lft = 0;
2250 create = 1;
2251 ifp->cstamp = jiffies;
2252 ifp->tokenized = tokenized;
2253 addrconf_dad_start(ifp);
2254 }
2255
2256 if (ifp) {
2257 u32 flags;
2258 unsigned long now;
2259 u32 stored_lft;
2260
2261 /* update lifetime (RFC2462 5.5.3 e) */
2262 spin_lock(&ifp->lock);
2263 now = jiffies;
2264 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2265 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2266 else
2267 stored_lft = 0;
2268 if (!update_lft && !create && stored_lft) {
2269 const u32 minimum_lft = min(
2270 stored_lft, (u32)MIN_VALID_LIFETIME);
2271 valid_lft = max(valid_lft, minimum_lft);
2272
2273 /* RFC4862 Section 5.5.3e:
2274 * "Note that the preferred lifetime of the
2275 * corresponding address is always reset to
2276 * the Preferred Lifetime in the received
2277 * Prefix Information option, regardless of
2278 * whether the valid lifetime is also reset or
2279 * ignored."
2280 *
2281 * So we should always update prefered_lft here.
2282 */
2283 update_lft = 1;
2284 }
2285
2286 if (update_lft) {
2287 ifp->valid_lft = valid_lft;
2288 ifp->prefered_lft = prefered_lft;
2289 ifp->tstamp = now;
2290 flags = ifp->flags;
2291 ifp->flags &= ~IFA_F_DEPRECATED;
2292 spin_unlock(&ifp->lock);
2293
2294 if (!(flags&IFA_F_TENTATIVE))
2295 ipv6_ifa_notify(0, ifp);
2296 } else
2297 spin_unlock(&ifp->lock);
2298
2299 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2300 create, now);
2301
2302 in6_ifa_put(ifp);
2303 addrconf_verify(0);
2304 }
2305 }
2306 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2307 in6_dev_put(in6_dev);
2308 }
2309
2310 /*
2311 * Set destination address.
2312 * Special case for SIT interfaces where we create a new "virtual"
2313 * device.
2314 */
2315 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2316 {
2317 struct in6_ifreq ireq;
2318 struct net_device *dev;
2319 int err = -EINVAL;
2320
2321 rtnl_lock();
2322
2323 err = -EFAULT;
2324 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2325 goto err_exit;
2326
2327 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2328
2329 err = -ENODEV;
2330 if (dev == NULL)
2331 goto err_exit;
2332
2333 #if IS_ENABLED(CONFIG_IPV6_SIT)
2334 if (dev->type == ARPHRD_SIT) {
2335 const struct net_device_ops *ops = dev->netdev_ops;
2336 struct ifreq ifr;
2337 struct ip_tunnel_parm p;
2338
2339 err = -EADDRNOTAVAIL;
2340 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2341 goto err_exit;
2342
2343 memset(&p, 0, sizeof(p));
2344 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2345 p.iph.saddr = 0;
2346 p.iph.version = 4;
2347 p.iph.ihl = 5;
2348 p.iph.protocol = IPPROTO_IPV6;
2349 p.iph.ttl = 64;
2350 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2351
2352 if (ops->ndo_do_ioctl) {
2353 mm_segment_t oldfs = get_fs();
2354
2355 set_fs(KERNEL_DS);
2356 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2357 set_fs(oldfs);
2358 } else
2359 err = -EOPNOTSUPP;
2360
2361 if (err == 0) {
2362 err = -ENOBUFS;
2363 dev = __dev_get_by_name(net, p.name);
2364 if (!dev)
2365 goto err_exit;
2366 err = dev_open(dev);
2367 }
2368 }
2369 #endif
2370
2371 err_exit:
2372 rtnl_unlock();
2373 return err;
2374 }
2375
2376 /*
2377 * Manual configuration of address on an interface
2378 */
2379 static int inet6_addr_add(struct net *net, int ifindex,
2380 const struct in6_addr *pfx,
2381 const struct in6_addr *peer_pfx,
2382 unsigned int plen, __u32 ifa_flags,
2383 __u32 prefered_lft, __u32 valid_lft)
2384 {
2385 struct inet6_ifaddr *ifp;
2386 struct inet6_dev *idev;
2387 struct net_device *dev;
2388 int scope;
2389 u32 flags;
2390 clock_t expires;
2391 unsigned long timeout;
2392
2393 ASSERT_RTNL();
2394
2395 if (plen > 128)
2396 return -EINVAL;
2397
2398 /* check the lifetime */
2399 if (!valid_lft || prefered_lft > valid_lft)
2400 return -EINVAL;
2401
2402 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2403 return -EINVAL;
2404
2405 dev = __dev_get_by_index(net, ifindex);
2406 if (!dev)
2407 return -ENODEV;
2408
2409 idev = addrconf_add_dev(dev);
2410 if (IS_ERR(idev))
2411 return PTR_ERR(idev);
2412
2413 scope = ipv6_addr_scope(pfx);
2414
2415 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2416 if (addrconf_finite_timeout(timeout)) {
2417 expires = jiffies_to_clock_t(timeout * HZ);
2418 valid_lft = timeout;
2419 flags = RTF_EXPIRES;
2420 } else {
2421 expires = 0;
2422 flags = 0;
2423 ifa_flags |= IFA_F_PERMANENT;
2424 }
2425
2426 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2427 if (addrconf_finite_timeout(timeout)) {
2428 if (timeout == 0)
2429 ifa_flags |= IFA_F_DEPRECATED;
2430 prefered_lft = timeout;
2431 }
2432
2433 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2434 valid_lft, prefered_lft);
2435
2436 if (!IS_ERR(ifp)) {
2437 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2438 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2439 expires, flags);
2440 }
2441
2442 /*
2443 * Note that section 3.1 of RFC 4429 indicates
2444 * that the Optimistic flag should not be set for
2445 * manually configured addresses
2446 */
2447 addrconf_dad_start(ifp);
2448 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2449 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2450 true, jiffies);
2451 in6_ifa_put(ifp);
2452 addrconf_verify(0);
2453 return 0;
2454 }
2455
2456 return PTR_ERR(ifp);
2457 }
2458
2459 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2460 unsigned int plen)
2461 {
2462 struct inet6_ifaddr *ifp;
2463 struct inet6_dev *idev;
2464 struct net_device *dev;
2465
2466 if (plen > 128)
2467 return -EINVAL;
2468
2469 dev = __dev_get_by_index(net, ifindex);
2470 if (!dev)
2471 return -ENODEV;
2472
2473 if ((idev = __in6_dev_get(dev)) == NULL)
2474 return -ENXIO;
2475
2476 read_lock_bh(&idev->lock);
2477 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2478 if (ifp->prefix_len == plen &&
2479 ipv6_addr_equal(pfx, &ifp->addr)) {
2480 in6_ifa_hold(ifp);
2481 read_unlock_bh(&idev->lock);
2482
2483 ipv6_del_addr(ifp);
2484 return 0;
2485 }
2486 }
2487 read_unlock_bh(&idev->lock);
2488 return -EADDRNOTAVAIL;
2489 }
2490
2491
2492 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2493 {
2494 struct in6_ifreq ireq;
2495 int err;
2496
2497 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2498 return -EPERM;
2499
2500 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2501 return -EFAULT;
2502
2503 rtnl_lock();
2504 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2505 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2506 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2507 rtnl_unlock();
2508 return err;
2509 }
2510
2511 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2512 {
2513 struct in6_ifreq ireq;
2514 int err;
2515
2516 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2517 return -EPERM;
2518
2519 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2520 return -EFAULT;
2521
2522 rtnl_lock();
2523 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2524 ireq.ifr6_prefixlen);
2525 rtnl_unlock();
2526 return err;
2527 }
2528
2529 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2530 int plen, int scope)
2531 {
2532 struct inet6_ifaddr *ifp;
2533
2534 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2535 scope, IFA_F_PERMANENT,
2536 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2537 if (!IS_ERR(ifp)) {
2538 spin_lock_bh(&ifp->lock);
2539 ifp->flags &= ~IFA_F_TENTATIVE;
2540 spin_unlock_bh(&ifp->lock);
2541 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2542 in6_ifa_put(ifp);
2543 }
2544 }
2545
2546 #if IS_ENABLED(CONFIG_IPV6_SIT)
2547 static void sit_add_v4_addrs(struct inet6_dev *idev)
2548 {
2549 struct in6_addr addr;
2550 struct net_device *dev;
2551 struct net *net = dev_net(idev->dev);
2552 int scope, plen;
2553 u32 pflags = 0;
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 plen = 64;
2564 } else {
2565 scope = IPV6_ADDR_COMPATv4;
2566 plen = 96;
2567 pflags |= RTF_NONEXTHOP;
2568 }
2569
2570 if (addr.s6_addr32[3]) {
2571 add_addr(idev, &addr, plen, scope);
2572 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2573 return;
2574 }
2575
2576 for_each_netdev(net, dev) {
2577 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2578 if (in_dev && (dev->flags & IFF_UP)) {
2579 struct in_ifaddr *ifa;
2580
2581 int flag = scope;
2582
2583 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2584
2585 addr.s6_addr32[3] = ifa->ifa_local;
2586
2587 if (ifa->ifa_scope == RT_SCOPE_LINK)
2588 continue;
2589 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2590 if (idev->dev->flags&IFF_POINTOPOINT)
2591 continue;
2592 flag |= IFA_HOST;
2593 }
2594
2595 add_addr(idev, &addr, plen, flag);
2596 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2597 pflags);
2598 }
2599 }
2600 }
2601 }
2602 #endif
2603
2604 static void init_loopback(struct net_device *dev)
2605 {
2606 struct inet6_dev *idev;
2607 struct net_device *sp_dev;
2608 struct inet6_ifaddr *sp_ifa;
2609 struct rt6_info *sp_rt;
2610
2611 /* ::1 */
2612
2613 ASSERT_RTNL();
2614
2615 if ((idev = ipv6_find_idev(dev)) == NULL) {
2616 pr_debug("%s: add_dev failed\n", __func__);
2617 return;
2618 }
2619
2620 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2621
2622 /* Add routes to other interface's IPv6 addresses */
2623 for_each_netdev(dev_net(dev), sp_dev) {
2624 if (!strcmp(sp_dev->name, dev->name))
2625 continue;
2626
2627 idev = __in6_dev_get(sp_dev);
2628 if (!idev)
2629 continue;
2630
2631 read_lock_bh(&idev->lock);
2632 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2633
2634 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2635 continue;
2636
2637 if (sp_ifa->rt)
2638 continue;
2639
2640 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2641
2642 /* Failure cases are ignored */
2643 if (!IS_ERR(sp_rt)) {
2644 sp_ifa->rt = sp_rt;
2645 ip6_ins_rt(sp_rt);
2646 }
2647 }
2648 read_unlock_bh(&idev->lock);
2649 }
2650 }
2651
2652 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2653 {
2654 struct inet6_ifaddr *ifp;
2655 u32 addr_flags = IFA_F_PERMANENT;
2656
2657 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2658 if (idev->cnf.optimistic_dad &&
2659 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2660 addr_flags |= IFA_F_OPTIMISTIC;
2661 #endif
2662
2663
2664 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2665 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2666 if (!IS_ERR(ifp)) {
2667 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2668 addrconf_dad_start(ifp);
2669 in6_ifa_put(ifp);
2670 }
2671 }
2672
2673 static void addrconf_dev_config(struct net_device *dev)
2674 {
2675 struct in6_addr addr;
2676 struct inet6_dev *idev;
2677
2678 ASSERT_RTNL();
2679
2680 if ((dev->type != ARPHRD_ETHER) &&
2681 (dev->type != ARPHRD_FDDI) &&
2682 (dev->type != ARPHRD_ARCNET) &&
2683 (dev->type != ARPHRD_INFINIBAND) &&
2684 (dev->type != ARPHRD_IEEE802154) &&
2685 (dev->type != ARPHRD_IEEE1394) &&
2686 (dev->type != ARPHRD_TUNNEL6) &&
2687 (dev->type != ARPHRD_6LOWPAN)) {
2688 /* Alas, we support only Ethernet autoconfiguration. */
2689 return;
2690 }
2691
2692 idev = addrconf_add_dev(dev);
2693 if (IS_ERR(idev))
2694 return;
2695
2696 memset(&addr, 0, sizeof(struct in6_addr));
2697 addr.s6_addr32[0] = htonl(0xFE800000);
2698
2699 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2700 addrconf_add_linklocal(idev, &addr);
2701 }
2702
2703 #if IS_ENABLED(CONFIG_IPV6_SIT)
2704 static void addrconf_sit_config(struct net_device *dev)
2705 {
2706 struct inet6_dev *idev;
2707
2708 ASSERT_RTNL();
2709
2710 /*
2711 * Configure the tunnel with one of our IPv4
2712 * addresses... we should configure all of
2713 * our v4 addrs in the tunnel
2714 */
2715
2716 if ((idev = ipv6_find_idev(dev)) == NULL) {
2717 pr_debug("%s: add_dev failed\n", __func__);
2718 return;
2719 }
2720
2721 if (dev->priv_flags & IFF_ISATAP) {
2722 struct in6_addr addr;
2723
2724 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2725 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2726 addrconf_add_linklocal(idev, &addr);
2727 return;
2728 }
2729
2730 sit_add_v4_addrs(idev);
2731
2732 if (dev->flags&IFF_POINTOPOINT)
2733 addrconf_add_mroute(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 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2752 addrconf_add_linklocal(idev, &addr);
2753 }
2754 #endif
2755
2756 static inline int
2757 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2758 {
2759 struct in6_addr lladdr;
2760
2761 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2762 addrconf_add_linklocal(idev, &lladdr);
2763 return 0;
2764 }
2765 return -1;
2766 }
2767
2768 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2769 void *ptr)
2770 {
2771 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2772 struct inet6_dev *idev = __in6_dev_get(dev);
2773 int run_pending = 0;
2774 int err;
2775
2776 switch (event) {
2777 case NETDEV_REGISTER:
2778 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2779 idev = ipv6_add_dev(dev);
2780 if (!idev)
2781 return notifier_from_errno(-ENOMEM);
2782 }
2783 break;
2784
2785 case NETDEV_UP:
2786 case NETDEV_CHANGE:
2787 if (dev->flags & IFF_SLAVE)
2788 break;
2789
2790 if (event == NETDEV_UP) {
2791 if (!addrconf_qdisc_ok(dev)) {
2792 /* device is not ready yet. */
2793 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2794 dev->name);
2795 break;
2796 }
2797
2798 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2799 idev = ipv6_add_dev(dev);
2800
2801 if (idev) {
2802 idev->if_flags |= IF_READY;
2803 run_pending = 1;
2804 }
2805 } else {
2806 if (!addrconf_qdisc_ok(dev)) {
2807 /* device is still not ready. */
2808 break;
2809 }
2810
2811 if (idev) {
2812 if (idev->if_flags & IF_READY)
2813 /* device is already configured. */
2814 break;
2815 idev->if_flags |= IF_READY;
2816 }
2817
2818 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2819 dev->name);
2820
2821 run_pending = 1;
2822 }
2823
2824 switch (dev->type) {
2825 #if IS_ENABLED(CONFIG_IPV6_SIT)
2826 case ARPHRD_SIT:
2827 addrconf_sit_config(dev);
2828 break;
2829 #endif
2830 #if IS_ENABLED(CONFIG_NET_IPGRE)
2831 case ARPHRD_IPGRE:
2832 addrconf_gre_config(dev);
2833 break;
2834 #endif
2835 case ARPHRD_LOOPBACK:
2836 init_loopback(dev);
2837 break;
2838
2839 default:
2840 addrconf_dev_config(dev);
2841 break;
2842 }
2843
2844 if (idev) {
2845 if (run_pending)
2846 addrconf_dad_run(idev);
2847
2848 /*
2849 * If the MTU changed during the interface down,
2850 * when the interface up, the changed MTU must be
2851 * reflected in the idev as well as routers.
2852 */
2853 if (idev->cnf.mtu6 != dev->mtu &&
2854 dev->mtu >= IPV6_MIN_MTU) {
2855 rt6_mtu_change(dev, dev->mtu);
2856 idev->cnf.mtu6 = dev->mtu;
2857 }
2858 idev->tstamp = jiffies;
2859 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2860
2861 /*
2862 * If the changed mtu during down is lower than
2863 * IPV6_MIN_MTU stop IPv6 on this interface.
2864 */
2865 if (dev->mtu < IPV6_MIN_MTU)
2866 addrconf_ifdown(dev, 1);
2867 }
2868 break;
2869
2870 case NETDEV_CHANGEMTU:
2871 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2872 rt6_mtu_change(dev, dev->mtu);
2873 idev->cnf.mtu6 = dev->mtu;
2874 break;
2875 }
2876
2877 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2878 idev = ipv6_add_dev(dev);
2879 if (idev)
2880 break;
2881 }
2882
2883 /*
2884 * if MTU under IPV6_MIN_MTU.
2885 * Stop IPv6 on this interface.
2886 */
2887
2888 case NETDEV_DOWN:
2889 case NETDEV_UNREGISTER:
2890 /*
2891 * Remove all addresses from this interface.
2892 */
2893 addrconf_ifdown(dev, event != NETDEV_DOWN);
2894 break;
2895
2896 case NETDEV_CHANGENAME:
2897 if (idev) {
2898 snmp6_unregister_dev(idev);
2899 addrconf_sysctl_unregister(idev);
2900 addrconf_sysctl_register(idev);
2901 err = snmp6_register_dev(idev);
2902 if (err)
2903 return notifier_from_errno(err);
2904 }
2905 break;
2906
2907 case NETDEV_PRE_TYPE_CHANGE:
2908 case NETDEV_POST_TYPE_CHANGE:
2909 addrconf_type_change(dev, event);
2910 break;
2911 }
2912
2913 return NOTIFY_OK;
2914 }
2915
2916 /*
2917 * addrconf module should be notified of a device going up
2918 */
2919 static struct notifier_block ipv6_dev_notf = {
2920 .notifier_call = addrconf_notify,
2921 };
2922
2923 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2924 {
2925 struct inet6_dev *idev;
2926 ASSERT_RTNL();
2927
2928 idev = __in6_dev_get(dev);
2929
2930 if (event == NETDEV_POST_TYPE_CHANGE)
2931 ipv6_mc_remap(idev);
2932 else if (event == NETDEV_PRE_TYPE_CHANGE)
2933 ipv6_mc_unmap(idev);
2934 }
2935
2936 static int addrconf_ifdown(struct net_device *dev, int how)
2937 {
2938 struct net *net = dev_net(dev);
2939 struct inet6_dev *idev;
2940 struct inet6_ifaddr *ifa;
2941 int state, i;
2942
2943 ASSERT_RTNL();
2944
2945 rt6_ifdown(net, dev);
2946 neigh_ifdown(&nd_tbl, dev);
2947
2948 idev = __in6_dev_get(dev);
2949 if (idev == NULL)
2950 return -ENODEV;
2951
2952 /*
2953 * Step 1: remove reference to ipv6 device from parent device.
2954 * Do not dev_put!
2955 */
2956 if (how) {
2957 idev->dead = 1;
2958
2959 /* protected by rtnl_lock */
2960 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2961
2962 /* Step 1.5: remove snmp6 entry */
2963 snmp6_unregister_dev(idev);
2964
2965 }
2966
2967 /* Step 2: clear hash table */
2968 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2969 struct hlist_head *h = &inet6_addr_lst[i];
2970
2971 spin_lock_bh(&addrconf_hash_lock);
2972 restart:
2973 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
2974 if (ifa->idev == idev) {
2975 hlist_del_init_rcu(&ifa->addr_lst);
2976 addrconf_del_dad_timer(ifa);
2977 goto restart;
2978 }
2979 }
2980 spin_unlock_bh(&addrconf_hash_lock);
2981 }
2982
2983 write_lock_bh(&idev->lock);
2984
2985 addrconf_del_rs_timer(idev);
2986
2987 /* Step 2: clear flags for stateless addrconf */
2988 if (!how)
2989 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2990
2991 if (how && del_timer(&idev->regen_timer))
2992 in6_dev_put(idev);
2993
2994 /* Step 3: clear tempaddr list */
2995 while (!list_empty(&idev->tempaddr_list)) {
2996 ifa = list_first_entry(&idev->tempaddr_list,
2997 struct inet6_ifaddr, tmp_list);
2998 list_del(&ifa->tmp_list);
2999 write_unlock_bh(&idev->lock);
3000 spin_lock_bh(&ifa->lock);
3001
3002 if (ifa->ifpub) {
3003 in6_ifa_put(ifa->ifpub);
3004 ifa->ifpub = NULL;
3005 }
3006 spin_unlock_bh(&ifa->lock);
3007 in6_ifa_put(ifa);
3008 write_lock_bh(&idev->lock);
3009 }
3010
3011 while (!list_empty(&idev->addr_list)) {
3012 ifa = list_first_entry(&idev->addr_list,
3013 struct inet6_ifaddr, if_list);
3014 addrconf_del_dad_timer(ifa);
3015
3016 list_del(&ifa->if_list);
3017
3018 write_unlock_bh(&idev->lock);
3019
3020 spin_lock_bh(&ifa->state_lock);
3021 state = ifa->state;
3022 ifa->state = INET6_IFADDR_STATE_DEAD;
3023 spin_unlock_bh(&ifa->state_lock);
3024
3025 if (state != INET6_IFADDR_STATE_DEAD) {
3026 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3027 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3028 }
3029 in6_ifa_put(ifa);
3030
3031 write_lock_bh(&idev->lock);
3032 }
3033
3034 write_unlock_bh(&idev->lock);
3035
3036 /* Step 5: Discard multicast list */
3037 if (how)
3038 ipv6_mc_destroy_dev(idev);
3039 else
3040 ipv6_mc_down(idev);
3041
3042 idev->tstamp = jiffies;
3043
3044 /* Last: Shot the device (if unregistered) */
3045 if (how) {
3046 addrconf_sysctl_unregister(idev);
3047 neigh_parms_release(&nd_tbl, idev->nd_parms);
3048 neigh_ifdown(&nd_tbl, dev);
3049 in6_dev_put(idev);
3050 }
3051 return 0;
3052 }
3053
3054 static void addrconf_rs_timer(unsigned long data)
3055 {
3056 struct inet6_dev *idev = (struct inet6_dev *)data;
3057 struct net_device *dev = idev->dev;
3058 struct in6_addr lladdr;
3059
3060 write_lock(&idev->lock);
3061 if (idev->dead || !(idev->if_flags & IF_READY))
3062 goto out;
3063
3064 if (!ipv6_accept_ra(idev))
3065 goto out;
3066
3067 /* Announcement received after solicitation was sent */
3068 if (idev->if_flags & IF_RA_RCVD)
3069 goto out;
3070
3071 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3072 write_unlock(&idev->lock);
3073 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3074 ndisc_send_rs(dev, &lladdr,
3075 &in6addr_linklocal_allrouters);
3076 else
3077 goto put;
3078
3079 write_lock(&idev->lock);
3080 /* The wait after the last probe can be shorter */
3081 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3082 idev->cnf.rtr_solicits) ?
3083 idev->cnf.rtr_solicit_delay :
3084 idev->cnf.rtr_solicit_interval);
3085 } else {
3086 /*
3087 * Note: we do not support deprecated "all on-link"
3088 * assumption any longer.
3089 */
3090 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3091 }
3092
3093 out:
3094 write_unlock(&idev->lock);
3095 put:
3096 in6_dev_put(idev);
3097 }
3098
3099 /*
3100 * Duplicate Address Detection
3101 */
3102 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3103 {
3104 unsigned long rand_num;
3105 struct inet6_dev *idev = ifp->idev;
3106
3107 if (ifp->flags & IFA_F_OPTIMISTIC)
3108 rand_num = 0;
3109 else
3110 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3111
3112 ifp->dad_probes = idev->cnf.dad_transmits;
3113 addrconf_mod_dad_timer(ifp, rand_num);
3114 }
3115
3116 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3117 {
3118 struct inet6_dev *idev = ifp->idev;
3119 struct net_device *dev = idev->dev;
3120
3121 addrconf_join_solict(dev, &ifp->addr);
3122
3123 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3124
3125 read_lock_bh(&idev->lock);
3126 spin_lock(&ifp->lock);
3127 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3128 goto out;
3129
3130 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3131 idev->cnf.accept_dad < 1 ||
3132 !(ifp->flags&IFA_F_TENTATIVE) ||
3133 ifp->flags & IFA_F_NODAD) {
3134 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3135 spin_unlock(&ifp->lock);
3136 read_unlock_bh(&idev->lock);
3137
3138 addrconf_dad_completed(ifp);
3139 return;
3140 }
3141
3142 if (!(idev->if_flags & IF_READY)) {
3143 spin_unlock(&ifp->lock);
3144 read_unlock_bh(&idev->lock);
3145 /*
3146 * If the device is not ready:
3147 * - keep it tentative if it is a permanent address.
3148 * - otherwise, kill it.
3149 */
3150 in6_ifa_hold(ifp);
3151 addrconf_dad_stop(ifp, 0);
3152 return;
3153 }
3154
3155 /*
3156 * Optimistic nodes can start receiving
3157 * Frames right away
3158 */
3159 if (ifp->flags & IFA_F_OPTIMISTIC)
3160 ip6_ins_rt(ifp->rt);
3161
3162 addrconf_dad_kick(ifp);
3163 out:
3164 spin_unlock(&ifp->lock);
3165 read_unlock_bh(&idev->lock);
3166 }
3167
3168 static void addrconf_dad_timer(unsigned long data)
3169 {
3170 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3171 struct inet6_dev *idev = ifp->idev;
3172 struct in6_addr mcaddr;
3173
3174 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3175 goto out;
3176
3177 write_lock(&idev->lock);
3178 if (idev->dead || !(idev->if_flags & IF_READY)) {
3179 write_unlock(&idev->lock);
3180 goto out;
3181 }
3182
3183 spin_lock(&ifp->lock);
3184 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3185 spin_unlock(&ifp->lock);
3186 write_unlock(&idev->lock);
3187 goto out;
3188 }
3189
3190 if (ifp->dad_probes == 0) {
3191 /*
3192 * DAD was successful
3193 */
3194
3195 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3196 spin_unlock(&ifp->lock);
3197 write_unlock(&idev->lock);
3198
3199 addrconf_dad_completed(ifp);
3200
3201 goto out;
3202 }
3203
3204 ifp->dad_probes--;
3205 addrconf_mod_dad_timer(ifp,
3206 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3207 spin_unlock(&ifp->lock);
3208 write_unlock(&idev->lock);
3209
3210 /* send a neighbour solicitation for our addr */
3211 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3212 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3213 out:
3214 in6_ifa_put(ifp);
3215 }
3216
3217 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3218 {
3219 struct net_device *dev = ifp->idev->dev;
3220 struct in6_addr lladdr;
3221 bool send_rs, send_mld;
3222
3223 addrconf_del_dad_timer(ifp);
3224
3225 /*
3226 * Configure the address for reception. Now it is valid.
3227 */
3228
3229 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3230
3231 /* If added prefix is link local and we are prepared to process
3232 router advertisements, start sending router solicitations.
3233 */
3234
3235 read_lock_bh(&ifp->idev->lock);
3236 spin_lock(&ifp->lock);
3237 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3238 ifp->idev->valid_ll_addr_cnt == 1;
3239 send_rs = send_mld &&
3240 ipv6_accept_ra(ifp->idev) &&
3241 ifp->idev->cnf.rtr_solicits > 0 &&
3242 (dev->flags&IFF_LOOPBACK) == 0;
3243 spin_unlock(&ifp->lock);
3244 read_unlock_bh(&ifp->idev->lock);
3245
3246 /* While dad is in progress mld report's source address is in6_addrany.
3247 * Resend with proper ll now.
3248 */
3249 if (send_mld)
3250 ipv6_mc_dad_complete(ifp->idev);
3251
3252 if (send_rs) {
3253 /*
3254 * If a host as already performed a random delay
3255 * [...] as part of DAD [...] there is no need
3256 * to delay again before sending the first RS
3257 */
3258 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3259 return;
3260 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3261
3262 write_lock_bh(&ifp->idev->lock);
3263 spin_lock(&ifp->lock);
3264 ifp->idev->rs_probes = 1;
3265 ifp->idev->if_flags |= IF_RS_SENT;
3266 addrconf_mod_rs_timer(ifp->idev,
3267 ifp->idev->cnf.rtr_solicit_interval);
3268 spin_unlock(&ifp->lock);
3269 write_unlock_bh(&ifp->idev->lock);
3270 }
3271 }
3272
3273 static void addrconf_dad_run(struct inet6_dev *idev)
3274 {
3275 struct inet6_ifaddr *ifp;
3276
3277 read_lock_bh(&idev->lock);
3278 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3279 spin_lock(&ifp->lock);
3280 if (ifp->flags & IFA_F_TENTATIVE &&
3281 ifp->state == INET6_IFADDR_STATE_DAD)
3282 addrconf_dad_kick(ifp);
3283 spin_unlock(&ifp->lock);
3284 }
3285 read_unlock_bh(&idev->lock);
3286 }
3287
3288 #ifdef CONFIG_PROC_FS
3289 struct if6_iter_state {
3290 struct seq_net_private p;
3291 int bucket;
3292 int offset;
3293 };
3294
3295 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3296 {
3297 struct inet6_ifaddr *ifa = NULL;
3298 struct if6_iter_state *state = seq->private;
3299 struct net *net = seq_file_net(seq);
3300 int p = 0;
3301
3302 /* initial bucket if pos is 0 */
3303 if (pos == 0) {
3304 state->bucket = 0;
3305 state->offset = 0;
3306 }
3307
3308 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3309 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3310 addr_lst) {
3311 if (!net_eq(dev_net(ifa->idev->dev), net))
3312 continue;
3313 /* sync with offset */
3314 if (p < state->offset) {
3315 p++;
3316 continue;
3317 }
3318 state->offset++;
3319 return ifa;
3320 }
3321
3322 /* prepare for next bucket */
3323 state->offset = 0;
3324 p = 0;
3325 }
3326 return NULL;
3327 }
3328
3329 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3330 struct inet6_ifaddr *ifa)
3331 {
3332 struct if6_iter_state *state = seq->private;
3333 struct net *net = seq_file_net(seq);
3334
3335 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3336 if (!net_eq(dev_net(ifa->idev->dev), net))
3337 continue;
3338 state->offset++;
3339 return ifa;
3340 }
3341
3342 while (++state->bucket < IN6_ADDR_HSIZE) {
3343 state->offset = 0;
3344 hlist_for_each_entry_rcu_bh(ifa,
3345 &inet6_addr_lst[state->bucket], addr_lst) {
3346 if (!net_eq(dev_net(ifa->idev->dev), net))
3347 continue;
3348 state->offset++;
3349 return ifa;
3350 }
3351 }
3352
3353 return NULL;
3354 }
3355
3356 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3357 __acquires(rcu_bh)
3358 {
3359 rcu_read_lock_bh();
3360 return if6_get_first(seq, *pos);
3361 }
3362
3363 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3364 {
3365 struct inet6_ifaddr *ifa;
3366
3367 ifa = if6_get_next(seq, v);
3368 ++*pos;
3369 return ifa;
3370 }
3371
3372 static void if6_seq_stop(struct seq_file *seq, void *v)
3373 __releases(rcu_bh)
3374 {
3375 rcu_read_unlock_bh();
3376 }
3377
3378 static int if6_seq_show(struct seq_file *seq, void *v)
3379 {
3380 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3381 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3382 &ifp->addr,
3383 ifp->idev->dev->ifindex,
3384 ifp->prefix_len,
3385 ifp->scope,
3386 (u8) ifp->flags,
3387 ifp->idev->dev->name);
3388 return 0;
3389 }
3390
3391 static const struct seq_operations if6_seq_ops = {
3392 .start = if6_seq_start,
3393 .next = if6_seq_next,
3394 .show = if6_seq_show,
3395 .stop = if6_seq_stop,
3396 };
3397
3398 static int if6_seq_open(struct inode *inode, struct file *file)
3399 {
3400 return seq_open_net(inode, file, &if6_seq_ops,
3401 sizeof(struct if6_iter_state));
3402 }
3403
3404 static const struct file_operations if6_fops = {
3405 .owner = THIS_MODULE,
3406 .open = if6_seq_open,
3407 .read = seq_read,
3408 .llseek = seq_lseek,
3409 .release = seq_release_net,
3410 };
3411
3412 static int __net_init if6_proc_net_init(struct net *net)
3413 {
3414 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3415 return -ENOMEM;
3416 return 0;
3417 }
3418
3419 static void __net_exit if6_proc_net_exit(struct net *net)
3420 {
3421 remove_proc_entry("if_inet6", net->proc_net);
3422 }
3423
3424 static struct pernet_operations if6_proc_net_ops = {
3425 .init = if6_proc_net_init,
3426 .exit = if6_proc_net_exit,
3427 };
3428
3429 int __init if6_proc_init(void)
3430 {
3431 return register_pernet_subsys(&if6_proc_net_ops);
3432 }
3433
3434 void if6_proc_exit(void)
3435 {
3436 unregister_pernet_subsys(&if6_proc_net_ops);
3437 }
3438 #endif /* CONFIG_PROC_FS */
3439
3440 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3441 /* Check if address is a home address configured on any interface. */
3442 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3443 {
3444 int ret = 0;
3445 struct inet6_ifaddr *ifp = NULL;
3446 unsigned int hash = inet6_addr_hash(addr);
3447
3448 rcu_read_lock_bh();
3449 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3450 if (!net_eq(dev_net(ifp->idev->dev), net))
3451 continue;
3452 if (ipv6_addr_equal(&ifp->addr, addr) &&
3453 (ifp->flags & IFA_F_HOMEADDRESS)) {
3454 ret = 1;
3455 break;
3456 }
3457 }
3458 rcu_read_unlock_bh();
3459 return ret;
3460 }
3461 #endif
3462
3463 /*
3464 * Periodic address status verification
3465 */
3466
3467 static void addrconf_verify(unsigned long foo)
3468 {
3469 unsigned long now, next, next_sec, next_sched;
3470 struct inet6_ifaddr *ifp;
3471 int i;
3472
3473 rcu_read_lock_bh();
3474 spin_lock(&addrconf_verify_lock);
3475 now = jiffies;
3476 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3477
3478 del_timer(&addr_chk_timer);
3479
3480 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3481 restart:
3482 hlist_for_each_entry_rcu_bh(ifp,
3483 &inet6_addr_lst[i], addr_lst) {
3484 unsigned long age;
3485
3486 /* When setting preferred_lft to a value not zero or
3487 * infinity, while valid_lft is infinity
3488 * IFA_F_PERMANENT has a non-infinity life time.
3489 */
3490 if ((ifp->flags & IFA_F_PERMANENT) &&
3491 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3492 continue;
3493
3494 spin_lock(&ifp->lock);
3495 /* We try to batch several events at once. */
3496 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3497
3498 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3499 age >= ifp->valid_lft) {
3500 spin_unlock(&ifp->lock);
3501 in6_ifa_hold(ifp);
3502 ipv6_del_addr(ifp);
3503 goto restart;
3504 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3505 spin_unlock(&ifp->lock);
3506 continue;
3507 } else if (age >= ifp->prefered_lft) {
3508 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3509 int deprecate = 0;
3510
3511 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3512 deprecate = 1;
3513 ifp->flags |= IFA_F_DEPRECATED;
3514 }
3515
3516 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3517 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3518 next = ifp->tstamp + ifp->valid_lft * HZ;
3519
3520 spin_unlock(&ifp->lock);
3521
3522 if (deprecate) {
3523 in6_ifa_hold(ifp);
3524
3525 ipv6_ifa_notify(0, ifp);
3526 in6_ifa_put(ifp);
3527 goto restart;
3528 }
3529 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3530 !(ifp->flags&IFA_F_TENTATIVE)) {
3531 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3532 ifp->idev->cnf.dad_transmits *
3533 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3534
3535 if (age >= ifp->prefered_lft - regen_advance) {
3536 struct inet6_ifaddr *ifpub = ifp->ifpub;
3537 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3538 next = ifp->tstamp + ifp->prefered_lft * HZ;
3539 if (!ifp->regen_count && ifpub) {
3540 ifp->regen_count++;
3541 in6_ifa_hold(ifp);
3542 in6_ifa_hold(ifpub);
3543 spin_unlock(&ifp->lock);
3544
3545 spin_lock(&ifpub->lock);
3546 ifpub->regen_count = 0;
3547 spin_unlock(&ifpub->lock);
3548 ipv6_create_tempaddr(ifpub, ifp);
3549 in6_ifa_put(ifpub);
3550 in6_ifa_put(ifp);
3551 goto restart;
3552 }
3553 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3554 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3555 spin_unlock(&ifp->lock);
3556 } else {
3557 /* ifp->prefered_lft <= ifp->valid_lft */
3558 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3559 next = ifp->tstamp + ifp->prefered_lft * HZ;
3560 spin_unlock(&ifp->lock);
3561 }
3562 }
3563 }
3564
3565 next_sec = round_jiffies_up(next);
3566 next_sched = next;
3567
3568 /* If rounded timeout is accurate enough, accept it. */
3569 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3570 next_sched = next_sec;
3571
3572 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3573 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3574 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3575
3576 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3577 now, next, next_sec, next_sched);
3578
3579 addr_chk_timer.expires = next_sched;
3580 add_timer(&addr_chk_timer);
3581 spin_unlock(&addrconf_verify_lock);
3582 rcu_read_unlock_bh();
3583 }
3584
3585 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3586 struct in6_addr **peer_pfx)
3587 {
3588 struct in6_addr *pfx = NULL;
3589
3590 *peer_pfx = NULL;
3591
3592 if (addr)
3593 pfx = nla_data(addr);
3594
3595 if (local) {
3596 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3597 *peer_pfx = pfx;
3598 pfx = nla_data(local);
3599 }
3600
3601 return pfx;
3602 }
3603
3604 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3605 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3606 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3607 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3608 [IFA_FLAGS] = { .len = sizeof(u32) },
3609 };
3610
3611 static int
3612 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3613 {
3614 struct net *net = sock_net(skb->sk);
3615 struct ifaddrmsg *ifm;
3616 struct nlattr *tb[IFA_MAX+1];
3617 struct in6_addr *pfx, *peer_pfx;
3618 int err;
3619
3620 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3621 if (err < 0)
3622 return err;
3623
3624 ifm = nlmsg_data(nlh);
3625 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3626 if (pfx == NULL)
3627 return -EINVAL;
3628
3629 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3630 }
3631
3632 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
3633 u32 prefered_lft, u32 valid_lft)
3634 {
3635 u32 flags;
3636 clock_t expires;
3637 unsigned long timeout;
3638 bool was_managetempaddr;
3639
3640 if (!valid_lft || (prefered_lft > valid_lft))
3641 return -EINVAL;
3642
3643 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3644 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3645 return -EINVAL;
3646
3647 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3648 if (addrconf_finite_timeout(timeout)) {
3649 expires = jiffies_to_clock_t(timeout * HZ);
3650 valid_lft = timeout;
3651 flags = RTF_EXPIRES;
3652 } else {
3653 expires = 0;
3654 flags = 0;
3655 ifa_flags |= IFA_F_PERMANENT;
3656 }
3657
3658 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3659 if (addrconf_finite_timeout(timeout)) {
3660 if (timeout == 0)
3661 ifa_flags |= IFA_F_DEPRECATED;
3662 prefered_lft = timeout;
3663 }
3664
3665 spin_lock_bh(&ifp->lock);
3666 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
3667 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
3668 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3669 IFA_F_NOPREFIXROUTE);
3670 ifp->flags |= ifa_flags;
3671 ifp->tstamp = jiffies;
3672 ifp->valid_lft = valid_lft;
3673 ifp->prefered_lft = prefered_lft;
3674
3675 spin_unlock_bh(&ifp->lock);
3676 if (!(ifp->flags&IFA_F_TENTATIVE))
3677 ipv6_ifa_notify(0, ifp);
3678
3679 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
3680 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3681 expires, flags);
3682 }
3683
3684 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3685 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3686 valid_lft = prefered_lft = 0;
3687 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3688 !was_managetempaddr, jiffies);
3689 }
3690
3691 addrconf_verify(0);
3692
3693 return 0;
3694 }
3695
3696 static int
3697 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3698 {
3699 struct net *net = sock_net(skb->sk);
3700 struct ifaddrmsg *ifm;
3701 struct nlattr *tb[IFA_MAX+1];
3702 struct in6_addr *pfx, *peer_pfx;
3703 struct inet6_ifaddr *ifa;
3704 struct net_device *dev;
3705 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3706 u32 ifa_flags;
3707 int err;
3708
3709 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3710 if (err < 0)
3711 return err;
3712
3713 ifm = nlmsg_data(nlh);
3714 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3715 if (pfx == NULL)
3716 return -EINVAL;
3717
3718 if (tb[IFA_CACHEINFO]) {
3719 struct ifa_cacheinfo *ci;
3720
3721 ci = nla_data(tb[IFA_CACHEINFO]);
3722 valid_lft = ci->ifa_valid;
3723 preferred_lft = ci->ifa_prefered;
3724 } else {
3725 preferred_lft = INFINITY_LIFE_TIME;
3726 valid_lft = INFINITY_LIFE_TIME;
3727 }
3728
3729 dev = __dev_get_by_index(net, ifm->ifa_index);
3730 if (dev == NULL)
3731 return -ENODEV;
3732
3733 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3734
3735 /* We ignore other flags so far. */
3736 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3737 IFA_F_NOPREFIXROUTE;
3738
3739 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3740 if (ifa == NULL) {
3741 /*
3742 * It would be best to check for !NLM_F_CREATE here but
3743 * userspace already relies on not having to provide this.
3744 */
3745 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3746 ifm->ifa_prefixlen, ifa_flags,
3747 preferred_lft, valid_lft);
3748 }
3749
3750 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3751 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3752 err = -EEXIST;
3753 else
3754 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3755
3756 in6_ifa_put(ifa);
3757
3758 return err;
3759 }
3760
3761 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
3762 u8 scope, int ifindex)
3763 {
3764 struct ifaddrmsg *ifm;
3765
3766 ifm = nlmsg_data(nlh);
3767 ifm->ifa_family = AF_INET6;
3768 ifm->ifa_prefixlen = prefixlen;
3769 ifm->ifa_flags = flags;
3770 ifm->ifa_scope = scope;
3771 ifm->ifa_index = ifindex;
3772 }
3773
3774 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3775 unsigned long tstamp, u32 preferred, u32 valid)
3776 {
3777 struct ifa_cacheinfo ci;
3778
3779 ci.cstamp = cstamp_delta(cstamp);
3780 ci.tstamp = cstamp_delta(tstamp);
3781 ci.ifa_prefered = preferred;
3782 ci.ifa_valid = valid;
3783
3784 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3785 }
3786
3787 static inline int rt_scope(int ifa_scope)
3788 {
3789 if (ifa_scope & IFA_HOST)
3790 return RT_SCOPE_HOST;
3791 else if (ifa_scope & IFA_LINK)
3792 return RT_SCOPE_LINK;
3793 else if (ifa_scope & IFA_SITE)
3794 return RT_SCOPE_SITE;
3795 else
3796 return RT_SCOPE_UNIVERSE;
3797 }
3798
3799 static inline int inet6_ifaddr_msgsize(void)
3800 {
3801 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3802 + nla_total_size(16) /* IFA_LOCAL */
3803 + nla_total_size(16) /* IFA_ADDRESS */
3804 + nla_total_size(sizeof(struct ifa_cacheinfo))
3805 + nla_total_size(4) /* IFA_FLAGS */;
3806 }
3807
3808 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3809 u32 portid, u32 seq, int event, unsigned int flags)
3810 {
3811 struct nlmsghdr *nlh;
3812 u32 preferred, valid;
3813
3814 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3815 if (nlh == NULL)
3816 return -EMSGSIZE;
3817
3818 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3819 ifa->idev->dev->ifindex);
3820
3821 if (!((ifa->flags&IFA_F_PERMANENT) &&
3822 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
3823 preferred = ifa->prefered_lft;
3824 valid = ifa->valid_lft;
3825 if (preferred != INFINITY_LIFE_TIME) {
3826 long tval = (jiffies - ifa->tstamp)/HZ;
3827 if (preferred > tval)
3828 preferred -= tval;
3829 else
3830 preferred = 0;
3831 if (valid != INFINITY_LIFE_TIME) {
3832 if (valid > tval)
3833 valid -= tval;
3834 else
3835 valid = 0;
3836 }
3837 }
3838 } else {
3839 preferred = INFINITY_LIFE_TIME;
3840 valid = INFINITY_LIFE_TIME;
3841 }
3842
3843 if (!ipv6_addr_any(&ifa->peer_addr)) {
3844 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3845 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3846 goto error;
3847 } else
3848 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3849 goto error;
3850
3851 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3852 goto error;
3853
3854 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
3855 goto error;
3856
3857 return nlmsg_end(skb, nlh);
3858
3859 error:
3860 nlmsg_cancel(skb, nlh);
3861 return -EMSGSIZE;
3862 }
3863
3864 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3865 u32 portid, u32 seq, int event, u16 flags)
3866 {
3867 struct nlmsghdr *nlh;
3868 u8 scope = RT_SCOPE_UNIVERSE;
3869 int ifindex = ifmca->idev->dev->ifindex;
3870
3871 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3872 scope = RT_SCOPE_SITE;
3873
3874 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3875 if (nlh == NULL)
3876 return -EMSGSIZE;
3877
3878 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3879 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3880 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3881 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3882 nlmsg_cancel(skb, nlh);
3883 return -EMSGSIZE;
3884 }
3885
3886 return nlmsg_end(skb, nlh);
3887 }
3888
3889 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3890 u32 portid, u32 seq, int event, unsigned int flags)
3891 {
3892 struct nlmsghdr *nlh;
3893 u8 scope = RT_SCOPE_UNIVERSE;
3894 int ifindex = ifaca->aca_idev->dev->ifindex;
3895
3896 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3897 scope = RT_SCOPE_SITE;
3898
3899 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3900 if (nlh == NULL)
3901 return -EMSGSIZE;
3902
3903 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3904 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3905 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3906 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3907 nlmsg_cancel(skb, nlh);
3908 return -EMSGSIZE;
3909 }
3910
3911 return nlmsg_end(skb, nlh);
3912 }
3913
3914 enum addr_type_t {
3915 UNICAST_ADDR,
3916 MULTICAST_ADDR,
3917 ANYCAST_ADDR,
3918 };
3919
3920 /* called with rcu_read_lock() */
3921 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3922 struct netlink_callback *cb, enum addr_type_t type,
3923 int s_ip_idx, int *p_ip_idx)
3924 {
3925 struct ifmcaddr6 *ifmca;
3926 struct ifacaddr6 *ifaca;
3927 int err = 1;
3928 int ip_idx = *p_ip_idx;
3929
3930 read_lock_bh(&idev->lock);
3931 switch (type) {
3932 case UNICAST_ADDR: {
3933 struct inet6_ifaddr *ifa;
3934
3935 /* unicast address incl. temp addr */
3936 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3937 if (++ip_idx < s_ip_idx)
3938 continue;
3939 err = inet6_fill_ifaddr(skb, ifa,
3940 NETLINK_CB(cb->skb).portid,
3941 cb->nlh->nlmsg_seq,
3942 RTM_NEWADDR,
3943 NLM_F_MULTI);
3944 if (err <= 0)
3945 break;
3946 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3947 }
3948 break;
3949 }
3950 case MULTICAST_ADDR:
3951 /* multicast address */
3952 for (ifmca = idev->mc_list; ifmca;
3953 ifmca = ifmca->next, ip_idx++) {
3954 if (ip_idx < s_ip_idx)
3955 continue;
3956 err = inet6_fill_ifmcaddr(skb, ifmca,
3957 NETLINK_CB(cb->skb).portid,
3958 cb->nlh->nlmsg_seq,
3959 RTM_GETMULTICAST,
3960 NLM_F_MULTI);
3961 if (err <= 0)
3962 break;
3963 }
3964 break;
3965 case ANYCAST_ADDR:
3966 /* anycast address */
3967 for (ifaca = idev->ac_list; ifaca;
3968 ifaca = ifaca->aca_next, ip_idx++) {
3969 if (ip_idx < s_ip_idx)
3970 continue;
3971 err = inet6_fill_ifacaddr(skb, ifaca,
3972 NETLINK_CB(cb->skb).portid,
3973 cb->nlh->nlmsg_seq,
3974 RTM_GETANYCAST,
3975 NLM_F_MULTI);
3976 if (err <= 0)
3977 break;
3978 }
3979 break;
3980 default:
3981 break;
3982 }
3983 read_unlock_bh(&idev->lock);
3984 *p_ip_idx = ip_idx;
3985 return err;
3986 }
3987
3988 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3989 enum addr_type_t type)
3990 {
3991 struct net *net = sock_net(skb->sk);
3992 int h, s_h;
3993 int idx, ip_idx;
3994 int s_idx, s_ip_idx;
3995 struct net_device *dev;
3996 struct inet6_dev *idev;
3997 struct hlist_head *head;
3998
3999 s_h = cb->args[0];
4000 s_idx = idx = cb->args[1];
4001 s_ip_idx = ip_idx = cb->args[2];
4002
4003 rcu_read_lock();
4004 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4005 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4006 idx = 0;
4007 head = &net->dev_index_head[h];
4008 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4009 if (idx < s_idx)
4010 goto cont;
4011 if (h > s_h || idx > s_idx)
4012 s_ip_idx = 0;
4013 ip_idx = 0;
4014 idev = __in6_dev_get(dev);
4015 if (!idev)
4016 goto cont;
4017
4018 if (in6_dump_addrs(idev, skb, cb, type,
4019 s_ip_idx, &ip_idx) <= 0)
4020 goto done;
4021 cont:
4022 idx++;
4023 }
4024 }
4025 done:
4026 rcu_read_unlock();
4027 cb->args[0] = h;
4028 cb->args[1] = idx;
4029 cb->args[2] = ip_idx;
4030
4031 return skb->len;
4032 }
4033
4034 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4035 {
4036 enum addr_type_t type = UNICAST_ADDR;
4037
4038 return inet6_dump_addr(skb, cb, type);
4039 }
4040
4041 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4042 {
4043 enum addr_type_t type = MULTICAST_ADDR;
4044
4045 return inet6_dump_addr(skb, cb, type);
4046 }
4047
4048
4049 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4050 {
4051 enum addr_type_t type = ANYCAST_ADDR;
4052
4053 return inet6_dump_addr(skb, cb, type);
4054 }
4055
4056 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4057 {
4058 struct net *net = sock_net(in_skb->sk);
4059 struct ifaddrmsg *ifm;
4060 struct nlattr *tb[IFA_MAX+1];
4061 struct in6_addr *addr = NULL, *peer;
4062 struct net_device *dev = NULL;
4063 struct inet6_ifaddr *ifa;
4064 struct sk_buff *skb;
4065 int err;
4066
4067 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4068 if (err < 0)
4069 goto errout;
4070
4071 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4072 if (addr == NULL) {
4073 err = -EINVAL;
4074 goto errout;
4075 }
4076
4077 ifm = nlmsg_data(nlh);
4078 if (ifm->ifa_index)
4079 dev = __dev_get_by_index(net, ifm->ifa_index);
4080
4081 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4082 if (!ifa) {
4083 err = -EADDRNOTAVAIL;
4084 goto errout;
4085 }
4086
4087 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4088 if (!skb) {
4089 err = -ENOBUFS;
4090 goto errout_ifa;
4091 }
4092
4093 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4094 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4095 if (err < 0) {
4096 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4097 WARN_ON(err == -EMSGSIZE);
4098 kfree_skb(skb);
4099 goto errout_ifa;
4100 }
4101 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4102 errout_ifa:
4103 in6_ifa_put(ifa);
4104 errout:
4105 return err;
4106 }
4107
4108 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4109 {
4110 struct sk_buff *skb;
4111 struct net *net = dev_net(ifa->idev->dev);
4112 int err = -ENOBUFS;
4113
4114 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4115 if (skb == NULL)
4116 goto errout;
4117
4118 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4119 if (err < 0) {
4120 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4121 WARN_ON(err == -EMSGSIZE);
4122 kfree_skb(skb);
4123 goto errout;
4124 }
4125 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4126 return;
4127 errout:
4128 if (err < 0)
4129 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4130 }
4131
4132 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4133 __s32 *array, int bytes)
4134 {
4135 BUG_ON(bytes < (DEVCONF_MAX * 4));
4136
4137 memset(array, 0, bytes);
4138 array[DEVCONF_FORWARDING] = cnf->forwarding;
4139 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4140 array[DEVCONF_MTU6] = cnf->mtu6;
4141 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4142 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4143 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4144 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4145 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4146 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4147 jiffies_to_msecs(cnf->rtr_solicit_interval);
4148 array[DEVCONF_RTR_SOLICIT_DELAY] =
4149 jiffies_to_msecs(cnf->rtr_solicit_delay);
4150 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4151 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4152 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4153 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4154 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4155 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4156 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4157 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4158 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4159 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4160 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4161 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4162 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4163 #ifdef CONFIG_IPV6_ROUTER_PREF
4164 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4165 array[DEVCONF_RTR_PROBE_INTERVAL] =
4166 jiffies_to_msecs(cnf->rtr_probe_interval);
4167 #ifdef CONFIG_IPV6_ROUTE_INFO
4168 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4169 #endif
4170 #endif
4171 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4172 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4173 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4174 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4175 #endif
4176 #ifdef CONFIG_IPV6_MROUTE
4177 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4178 #endif
4179 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4180 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4181 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4182 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4183 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4184 }
4185
4186 static inline size_t inet6_ifla6_size(void)
4187 {
4188 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4189 + nla_total_size(sizeof(struct ifla_cacheinfo))
4190 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4191 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4192 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4193 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4194 }
4195
4196 static inline size_t inet6_if_nlmsg_size(void)
4197 {
4198 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4199 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4200 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4201 + nla_total_size(4) /* IFLA_MTU */
4202 + nla_total_size(4) /* IFLA_LINK */
4203 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4204 }
4205
4206 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4207 int items, int bytes)
4208 {
4209 int i;
4210 int pad = bytes - sizeof(u64) * items;
4211 BUG_ON(pad < 0);
4212
4213 /* Use put_unaligned() because stats may not be aligned for u64. */
4214 put_unaligned(items, &stats[0]);
4215 for (i = 1; i < items; i++)
4216 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4217
4218 memset(&stats[items], 0, pad);
4219 }
4220
4221 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4222 int items, int bytes, size_t syncpoff)
4223 {
4224 int i;
4225 int pad = bytes - sizeof(u64) * items;
4226 BUG_ON(pad < 0);
4227
4228 /* Use put_unaligned() because stats may not be aligned for u64. */
4229 put_unaligned(items, &stats[0]);
4230 for (i = 1; i < items; i++)
4231 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4232
4233 memset(&stats[items], 0, pad);
4234 }
4235
4236 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4237 int bytes)
4238 {
4239 switch (attrtype) {
4240 case IFLA_INET6_STATS:
4241 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4242 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4243 break;
4244 case IFLA_INET6_ICMP6STATS:
4245 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4246 break;
4247 }
4248 }
4249
4250 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4251 {
4252 struct nlattr *nla;
4253 struct ifla_cacheinfo ci;
4254
4255 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4256 goto nla_put_failure;
4257 ci.max_reasm_len = IPV6_MAXPLEN;
4258 ci.tstamp = cstamp_delta(idev->tstamp);
4259 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4260 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4261 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4262 goto nla_put_failure;
4263 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4264 if (nla == NULL)
4265 goto nla_put_failure;
4266 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4267
4268 /* XXX - MC not implemented */
4269
4270 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4271 if (nla == NULL)
4272 goto nla_put_failure;
4273 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4274
4275 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4276 if (nla == NULL)
4277 goto nla_put_failure;
4278 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4279
4280 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4281 if (nla == NULL)
4282 goto nla_put_failure;
4283 read_lock_bh(&idev->lock);
4284 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4285 read_unlock_bh(&idev->lock);
4286
4287 return 0;
4288
4289 nla_put_failure:
4290 return -EMSGSIZE;
4291 }
4292
4293 static size_t inet6_get_link_af_size(const struct net_device *dev)
4294 {
4295 if (!__in6_dev_get(dev))
4296 return 0;
4297
4298 return inet6_ifla6_size();
4299 }
4300
4301 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4302 {
4303 struct inet6_dev *idev = __in6_dev_get(dev);
4304
4305 if (!idev)
4306 return -ENODATA;
4307
4308 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4309 return -EMSGSIZE;
4310
4311 return 0;
4312 }
4313
4314 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4315 {
4316 struct inet6_ifaddr *ifp;
4317 struct net_device *dev = idev->dev;
4318 bool update_rs = false;
4319 struct in6_addr ll_addr;
4320
4321 if (token == NULL)
4322 return -EINVAL;
4323 if (ipv6_addr_any(token))
4324 return -EINVAL;
4325 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4326 return -EINVAL;
4327 if (!ipv6_accept_ra(idev))
4328 return -EINVAL;
4329 if (idev->cnf.rtr_solicits <= 0)
4330 return -EINVAL;
4331
4332 write_lock_bh(&idev->lock);
4333
4334 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4335 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4336
4337 write_unlock_bh(&idev->lock);
4338
4339 if (!idev->dead && (idev->if_flags & IF_READY) &&
4340 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4341 IFA_F_OPTIMISTIC)) {
4342
4343 /* If we're not ready, then normal ifup will take care
4344 * of this. Otherwise, we need to request our rs here.
4345 */
4346 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4347 update_rs = true;
4348 }
4349
4350 write_lock_bh(&idev->lock);
4351
4352 if (update_rs) {
4353 idev->if_flags |= IF_RS_SENT;
4354 idev->rs_probes = 1;
4355 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4356 }
4357
4358 /* Well, that's kinda nasty ... */
4359 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4360 spin_lock(&ifp->lock);
4361 if (ifp->tokenized) {
4362 ifp->valid_lft = 0;
4363 ifp->prefered_lft = 0;
4364 }
4365 spin_unlock(&ifp->lock);
4366 }
4367
4368 write_unlock_bh(&idev->lock);
4369 addrconf_verify(0);
4370 return 0;
4371 }
4372
4373 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4374 {
4375 int err = -EINVAL;
4376 struct inet6_dev *idev = __in6_dev_get(dev);
4377 struct nlattr *tb[IFLA_INET6_MAX + 1];
4378
4379 if (!idev)
4380 return -EAFNOSUPPORT;
4381
4382 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4383 BUG();
4384
4385 if (tb[IFLA_INET6_TOKEN])
4386 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4387
4388 return err;
4389 }
4390
4391 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4392 u32 portid, u32 seq, int event, unsigned int flags)
4393 {
4394 struct net_device *dev = idev->dev;
4395 struct ifinfomsg *hdr;
4396 struct nlmsghdr *nlh;
4397 void *protoinfo;
4398
4399 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4400 if (nlh == NULL)
4401 return -EMSGSIZE;
4402
4403 hdr = nlmsg_data(nlh);
4404 hdr->ifi_family = AF_INET6;
4405 hdr->__ifi_pad = 0;
4406 hdr->ifi_type = dev->type;
4407 hdr->ifi_index = dev->ifindex;
4408 hdr->ifi_flags = dev_get_flags(dev);
4409 hdr->ifi_change = 0;
4410
4411 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4412 (dev->addr_len &&
4413 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4414 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4415 (dev->ifindex != dev->iflink &&
4416 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4417 goto nla_put_failure;
4418 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4419 if (protoinfo == NULL)
4420 goto nla_put_failure;
4421
4422 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4423 goto nla_put_failure;
4424
4425 nla_nest_end(skb, protoinfo);
4426 return nlmsg_end(skb, nlh);
4427
4428 nla_put_failure:
4429 nlmsg_cancel(skb, nlh);
4430 return -EMSGSIZE;
4431 }
4432
4433 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4434 {
4435 struct net *net = sock_net(skb->sk);
4436 int h, s_h;
4437 int idx = 0, s_idx;
4438 struct net_device *dev;
4439 struct inet6_dev *idev;
4440 struct hlist_head *head;
4441
4442 s_h = cb->args[0];
4443 s_idx = cb->args[1];
4444
4445 rcu_read_lock();
4446 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4447 idx = 0;
4448 head = &net->dev_index_head[h];
4449 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4450 if (idx < s_idx)
4451 goto cont;
4452 idev = __in6_dev_get(dev);
4453 if (!idev)
4454 goto cont;
4455 if (inet6_fill_ifinfo(skb, idev,
4456 NETLINK_CB(cb->skb).portid,
4457 cb->nlh->nlmsg_seq,
4458 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4459 goto out;
4460 cont:
4461 idx++;
4462 }
4463 }
4464 out:
4465 rcu_read_unlock();
4466 cb->args[1] = idx;
4467 cb->args[0] = h;
4468
4469 return skb->len;
4470 }
4471
4472 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4473 {
4474 struct sk_buff *skb;
4475 struct net *net = dev_net(idev->dev);
4476 int err = -ENOBUFS;
4477
4478 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4479 if (skb == NULL)
4480 goto errout;
4481
4482 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4483 if (err < 0) {
4484 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4485 WARN_ON(err == -EMSGSIZE);
4486 kfree_skb(skb);
4487 goto errout;
4488 }
4489 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4490 return;
4491 errout:
4492 if (err < 0)
4493 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4494 }
4495
4496 static inline size_t inet6_prefix_nlmsg_size(void)
4497 {
4498 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4499 + nla_total_size(sizeof(struct in6_addr))
4500 + nla_total_size(sizeof(struct prefix_cacheinfo));
4501 }
4502
4503 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4504 struct prefix_info *pinfo, u32 portid, u32 seq,
4505 int event, unsigned int flags)
4506 {
4507 struct prefixmsg *pmsg;
4508 struct nlmsghdr *nlh;
4509 struct prefix_cacheinfo ci;
4510
4511 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4512 if (nlh == NULL)
4513 return -EMSGSIZE;
4514
4515 pmsg = nlmsg_data(nlh);
4516 pmsg->prefix_family = AF_INET6;
4517 pmsg->prefix_pad1 = 0;
4518 pmsg->prefix_pad2 = 0;
4519 pmsg->prefix_ifindex = idev->dev->ifindex;
4520 pmsg->prefix_len = pinfo->prefix_len;
4521 pmsg->prefix_type = pinfo->type;
4522 pmsg->prefix_pad3 = 0;
4523 pmsg->prefix_flags = 0;
4524 if (pinfo->onlink)
4525 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4526 if (pinfo->autoconf)
4527 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4528
4529 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4530 goto nla_put_failure;
4531 ci.preferred_time = ntohl(pinfo->prefered);
4532 ci.valid_time = ntohl(pinfo->valid);
4533 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4534 goto nla_put_failure;
4535 return nlmsg_end(skb, nlh);
4536
4537 nla_put_failure:
4538 nlmsg_cancel(skb, nlh);
4539 return -EMSGSIZE;
4540 }
4541
4542 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4543 struct prefix_info *pinfo)
4544 {
4545 struct sk_buff *skb;
4546 struct net *net = dev_net(idev->dev);
4547 int err = -ENOBUFS;
4548
4549 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4550 if (skb == NULL)
4551 goto errout;
4552
4553 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4554 if (err < 0) {
4555 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4556 WARN_ON(err == -EMSGSIZE);
4557 kfree_skb(skb);
4558 goto errout;
4559 }
4560 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4561 return;
4562 errout:
4563 if (err < 0)
4564 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4565 }
4566
4567 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4568 {
4569 write_lock_bh(&ifp->idev->lock);
4570 spin_lock(&ifp->lock);
4571 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4572 IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4573 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4574 ifp->idev->valid_ll_addr_cnt += count;
4575 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4576 spin_unlock(&ifp->lock);
4577 write_unlock_bh(&ifp->idev->lock);
4578 }
4579
4580 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4581 {
4582 struct net *net = dev_net(ifp->idev->dev);
4583
4584 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4585
4586 switch (event) {
4587 case RTM_NEWADDR:
4588 update_valid_ll_addr_cnt(ifp, 1);
4589
4590 /*
4591 * If the address was optimistic
4592 * we inserted the route at the start of
4593 * our DAD process, so we don't need
4594 * to do it again
4595 */
4596 if (!(ifp->rt->rt6i_node))
4597 ip6_ins_rt(ifp->rt);
4598 if (ifp->idev->cnf.forwarding)
4599 addrconf_join_anycast(ifp);
4600 if (!ipv6_addr_any(&ifp->peer_addr))
4601 addrconf_prefix_route(&ifp->peer_addr, 128,
4602 ifp->idev->dev, 0, 0);
4603 break;
4604 case RTM_DELADDR:
4605 update_valid_ll_addr_cnt(ifp, -1);
4606
4607 if (ifp->idev->cnf.forwarding)
4608 addrconf_leave_anycast(ifp);
4609 addrconf_leave_solict(ifp->idev, &ifp->addr);
4610 if (!ipv6_addr_any(&ifp->peer_addr)) {
4611 struct rt6_info *rt;
4612 struct net_device *dev = ifp->idev->dev;
4613
4614 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4615 dev->ifindex, 1);
4616 if (rt) {
4617 dst_hold(&rt->dst);
4618 if (ip6_del_rt(rt))
4619 dst_free(&rt->dst);
4620 }
4621 }
4622 dst_hold(&ifp->rt->dst);
4623
4624 if (ip6_del_rt(ifp->rt))
4625 dst_free(&ifp->rt->dst);
4626 break;
4627 }
4628 atomic_inc(&net->ipv6.dev_addr_genid);
4629 rt_genid_bump_ipv6(net);
4630 }
4631
4632 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4633 {
4634 rcu_read_lock_bh();
4635 if (likely(ifp->idev->dead == 0))
4636 __ipv6_ifa_notify(event, ifp);
4637 rcu_read_unlock_bh();
4638 }
4639
4640 #ifdef CONFIG_SYSCTL
4641
4642 static
4643 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4644 void __user *buffer, size_t *lenp, loff_t *ppos)
4645 {
4646 int *valp = ctl->data;
4647 int val = *valp;
4648 loff_t pos = *ppos;
4649 struct ctl_table lctl;
4650 int ret;
4651
4652 /*
4653 * ctl->data points to idev->cnf.forwarding, we should
4654 * not modify it until we get the rtnl lock.
4655 */
4656 lctl = *ctl;
4657 lctl.data = &val;
4658
4659 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4660
4661 if (write)
4662 ret = addrconf_fixup_forwarding(ctl, valp, val);
4663 if (ret)
4664 *ppos = pos;
4665 return ret;
4666 }
4667
4668 static void dev_disable_change(struct inet6_dev *idev)
4669 {
4670 struct netdev_notifier_info info;
4671
4672 if (!idev || !idev->dev)
4673 return;
4674
4675 netdev_notifier_info_init(&info, idev->dev);
4676 if (idev->cnf.disable_ipv6)
4677 addrconf_notify(NULL, NETDEV_DOWN, &info);
4678 else
4679 addrconf_notify(NULL, NETDEV_UP, &info);
4680 }
4681
4682 static void addrconf_disable_change(struct net *net, __s32 newf)
4683 {
4684 struct net_device *dev;
4685 struct inet6_dev *idev;
4686
4687 rcu_read_lock();
4688 for_each_netdev_rcu(net, dev) {
4689 idev = __in6_dev_get(dev);
4690 if (idev) {
4691 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4692 idev->cnf.disable_ipv6 = newf;
4693 if (changed)
4694 dev_disable_change(idev);
4695 }
4696 }
4697 rcu_read_unlock();
4698 }
4699
4700 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4701 {
4702 struct net *net;
4703 int old;
4704
4705 if (!rtnl_trylock())
4706 return restart_syscall();
4707
4708 net = (struct net *)table->extra2;
4709 old = *p;
4710 *p = newf;
4711
4712 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4713 rtnl_unlock();
4714 return 0;
4715 }
4716
4717 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4718 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4719 addrconf_disable_change(net, newf);
4720 } else if ((!newf) ^ (!old))
4721 dev_disable_change((struct inet6_dev *)table->extra1);
4722
4723 rtnl_unlock();
4724 return 0;
4725 }
4726
4727 static
4728 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4729 void __user *buffer, size_t *lenp, loff_t *ppos)
4730 {
4731 int *valp = ctl->data;
4732 int val = *valp;
4733 loff_t pos = *ppos;
4734 struct ctl_table lctl;
4735 int ret;
4736
4737 /*
4738 * ctl->data points to idev->cnf.disable_ipv6, we should
4739 * not modify it until we get the rtnl lock.
4740 */
4741 lctl = *ctl;
4742 lctl.data = &val;
4743
4744 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4745
4746 if (write)
4747 ret = addrconf_disable_ipv6(ctl, valp, val);
4748 if (ret)
4749 *ppos = pos;
4750 return ret;
4751 }
4752
4753 static
4754 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
4755 void __user *buffer, size_t *lenp, loff_t *ppos)
4756 {
4757 int *valp = ctl->data;
4758 int ret;
4759 int old, new;
4760
4761 old = *valp;
4762 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4763 new = *valp;
4764
4765 if (write && old != new) {
4766 struct net *net = ctl->extra2;
4767
4768 if (!rtnl_trylock())
4769 return restart_syscall();
4770
4771 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
4772 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4773 NETCONFA_IFINDEX_DEFAULT,
4774 net->ipv6.devconf_dflt);
4775 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
4776 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4777 NETCONFA_IFINDEX_ALL,
4778 net->ipv6.devconf_all);
4779 else {
4780 struct inet6_dev *idev = ctl->extra1;
4781
4782 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4783 idev->dev->ifindex,
4784 &idev->cnf);
4785 }
4786 rtnl_unlock();
4787 }
4788
4789 return ret;
4790 }
4791
4792
4793 static struct addrconf_sysctl_table
4794 {
4795 struct ctl_table_header *sysctl_header;
4796 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4797 } addrconf_sysctl __read_mostly = {
4798 .sysctl_header = NULL,
4799 .addrconf_vars = {
4800 {
4801 .procname = "forwarding",
4802 .data = &ipv6_devconf.forwarding,
4803 .maxlen = sizeof(int),
4804 .mode = 0644,
4805 .proc_handler = addrconf_sysctl_forward,
4806 },
4807 {
4808 .procname = "hop_limit",
4809 .data = &ipv6_devconf.hop_limit,
4810 .maxlen = sizeof(int),
4811 .mode = 0644,
4812 .proc_handler = proc_dointvec,
4813 },
4814 {
4815 .procname = "mtu",
4816 .data = &ipv6_devconf.mtu6,
4817 .maxlen = sizeof(int),
4818 .mode = 0644,
4819 .proc_handler = proc_dointvec,
4820 },
4821 {
4822 .procname = "accept_ra",
4823 .data = &ipv6_devconf.accept_ra,
4824 .maxlen = sizeof(int),
4825 .mode = 0644,
4826 .proc_handler = proc_dointvec,
4827 },
4828 {
4829 .procname = "accept_redirects",
4830 .data = &ipv6_devconf.accept_redirects,
4831 .maxlen = sizeof(int),
4832 .mode = 0644,
4833 .proc_handler = proc_dointvec,
4834 },
4835 {
4836 .procname = "autoconf",
4837 .data = &ipv6_devconf.autoconf,
4838 .maxlen = sizeof(int),
4839 .mode = 0644,
4840 .proc_handler = proc_dointvec,
4841 },
4842 {
4843 .procname = "dad_transmits",
4844 .data = &ipv6_devconf.dad_transmits,
4845 .maxlen = sizeof(int),
4846 .mode = 0644,
4847 .proc_handler = proc_dointvec,
4848 },
4849 {
4850 .procname = "router_solicitations",
4851 .data = &ipv6_devconf.rtr_solicits,
4852 .maxlen = sizeof(int),
4853 .mode = 0644,
4854 .proc_handler = proc_dointvec,
4855 },
4856 {
4857 .procname = "router_solicitation_interval",
4858 .data = &ipv6_devconf.rtr_solicit_interval,
4859 .maxlen = sizeof(int),
4860 .mode = 0644,
4861 .proc_handler = proc_dointvec_jiffies,
4862 },
4863 {
4864 .procname = "router_solicitation_delay",
4865 .data = &ipv6_devconf.rtr_solicit_delay,
4866 .maxlen = sizeof(int),
4867 .mode = 0644,
4868 .proc_handler = proc_dointvec_jiffies,
4869 },
4870 {
4871 .procname = "force_mld_version",
4872 .data = &ipv6_devconf.force_mld_version,
4873 .maxlen = sizeof(int),
4874 .mode = 0644,
4875 .proc_handler = proc_dointvec,
4876 },
4877 {
4878 .procname = "mldv1_unsolicited_report_interval",
4879 .data =
4880 &ipv6_devconf.mldv1_unsolicited_report_interval,
4881 .maxlen = sizeof(int),
4882 .mode = 0644,
4883 .proc_handler = proc_dointvec_ms_jiffies,
4884 },
4885 {
4886 .procname = "mldv2_unsolicited_report_interval",
4887 .data =
4888 &ipv6_devconf.mldv2_unsolicited_report_interval,
4889 .maxlen = sizeof(int),
4890 .mode = 0644,
4891 .proc_handler = proc_dointvec_ms_jiffies,
4892 },
4893 {
4894 .procname = "use_tempaddr",
4895 .data = &ipv6_devconf.use_tempaddr,
4896 .maxlen = sizeof(int),
4897 .mode = 0644,
4898 .proc_handler = proc_dointvec,
4899 },
4900 {
4901 .procname = "temp_valid_lft",
4902 .data = &ipv6_devconf.temp_valid_lft,
4903 .maxlen = sizeof(int),
4904 .mode = 0644,
4905 .proc_handler = proc_dointvec,
4906 },
4907 {
4908 .procname = "temp_prefered_lft",
4909 .data = &ipv6_devconf.temp_prefered_lft,
4910 .maxlen = sizeof(int),
4911 .mode = 0644,
4912 .proc_handler = proc_dointvec,
4913 },
4914 {
4915 .procname = "regen_max_retry",
4916 .data = &ipv6_devconf.regen_max_retry,
4917 .maxlen = sizeof(int),
4918 .mode = 0644,
4919 .proc_handler = proc_dointvec,
4920 },
4921 {
4922 .procname = "max_desync_factor",
4923 .data = &ipv6_devconf.max_desync_factor,
4924 .maxlen = sizeof(int),
4925 .mode = 0644,
4926 .proc_handler = proc_dointvec,
4927 },
4928 {
4929 .procname = "max_addresses",
4930 .data = &ipv6_devconf.max_addresses,
4931 .maxlen = sizeof(int),
4932 .mode = 0644,
4933 .proc_handler = proc_dointvec,
4934 },
4935 {
4936 .procname = "accept_ra_defrtr",
4937 .data = &ipv6_devconf.accept_ra_defrtr,
4938 .maxlen = sizeof(int),
4939 .mode = 0644,
4940 .proc_handler = proc_dointvec,
4941 },
4942 {
4943 .procname = "accept_ra_pinfo",
4944 .data = &ipv6_devconf.accept_ra_pinfo,
4945 .maxlen = sizeof(int),
4946 .mode = 0644,
4947 .proc_handler = proc_dointvec,
4948 },
4949 #ifdef CONFIG_IPV6_ROUTER_PREF
4950 {
4951 .procname = "accept_ra_rtr_pref",
4952 .data = &ipv6_devconf.accept_ra_rtr_pref,
4953 .maxlen = sizeof(int),
4954 .mode = 0644,
4955 .proc_handler = proc_dointvec,
4956 },
4957 {
4958 .procname = "router_probe_interval",
4959 .data = &ipv6_devconf.rtr_probe_interval,
4960 .maxlen = sizeof(int),
4961 .mode = 0644,
4962 .proc_handler = proc_dointvec_jiffies,
4963 },
4964 #ifdef CONFIG_IPV6_ROUTE_INFO
4965 {
4966 .procname = "accept_ra_rt_info_max_plen",
4967 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4968 .maxlen = sizeof(int),
4969 .mode = 0644,
4970 .proc_handler = proc_dointvec,
4971 },
4972 #endif
4973 #endif
4974 {
4975 .procname = "proxy_ndp",
4976 .data = &ipv6_devconf.proxy_ndp,
4977 .maxlen = sizeof(int),
4978 .mode = 0644,
4979 .proc_handler = addrconf_sysctl_proxy_ndp,
4980 },
4981 {
4982 .procname = "accept_source_route",
4983 .data = &ipv6_devconf.accept_source_route,
4984 .maxlen = sizeof(int),
4985 .mode = 0644,
4986 .proc_handler = proc_dointvec,
4987 },
4988 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4989 {
4990 .procname = "optimistic_dad",
4991 .data = &ipv6_devconf.optimistic_dad,
4992 .maxlen = sizeof(int),
4993 .mode = 0644,
4994 .proc_handler = proc_dointvec,
4995
4996 },
4997 #endif
4998 #ifdef CONFIG_IPV6_MROUTE
4999 {
5000 .procname = "mc_forwarding",
5001 .data = &ipv6_devconf.mc_forwarding,
5002 .maxlen = sizeof(int),
5003 .mode = 0444,
5004 .proc_handler = proc_dointvec,
5005 },
5006 #endif
5007 {
5008 .procname = "disable_ipv6",
5009 .data = &ipv6_devconf.disable_ipv6,
5010 .maxlen = sizeof(int),
5011 .mode = 0644,
5012 .proc_handler = addrconf_sysctl_disable,
5013 },
5014 {
5015 .procname = "accept_dad",
5016 .data = &ipv6_devconf.accept_dad,
5017 .maxlen = sizeof(int),
5018 .mode = 0644,
5019 .proc_handler = proc_dointvec,
5020 },
5021 {
5022 .procname = "force_tllao",
5023 .data = &ipv6_devconf.force_tllao,
5024 .maxlen = sizeof(int),
5025 .mode = 0644,
5026 .proc_handler = proc_dointvec
5027 },
5028 {
5029 .procname = "ndisc_notify",
5030 .data = &ipv6_devconf.ndisc_notify,
5031 .maxlen = sizeof(int),
5032 .mode = 0644,
5033 .proc_handler = proc_dointvec
5034 },
5035 {
5036 .procname = "suppress_frag_ndisc",
5037 .data = &ipv6_devconf.suppress_frag_ndisc,
5038 .maxlen = sizeof(int),
5039 .mode = 0644,
5040 .proc_handler = proc_dointvec
5041 },
5042 {
5043 /* sentinel */
5044 }
5045 },
5046 };
5047
5048 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5049 struct inet6_dev *idev, struct ipv6_devconf *p)
5050 {
5051 int i;
5052 struct addrconf_sysctl_table *t;
5053 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5054
5055 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5056 if (t == NULL)
5057 goto out;
5058
5059 for (i = 0; t->addrconf_vars[i].data; i++) {
5060 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5061 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5062 t->addrconf_vars[i].extra2 = net;
5063 }
5064
5065 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5066
5067 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5068 if (t->sysctl_header == NULL)
5069 goto free;
5070
5071 p->sysctl = t;
5072 return 0;
5073
5074 free:
5075 kfree(t);
5076 out:
5077 return -ENOBUFS;
5078 }
5079
5080 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5081 {
5082 struct addrconf_sysctl_table *t;
5083
5084 if (p->sysctl == NULL)
5085 return;
5086
5087 t = p->sysctl;
5088 p->sysctl = NULL;
5089 unregister_net_sysctl_table(t->sysctl_header);
5090 kfree(t);
5091 }
5092
5093 static void addrconf_sysctl_register(struct inet6_dev *idev)
5094 {
5095 neigh_sysctl_register(idev->dev, idev->nd_parms,
5096 &ndisc_ifinfo_sysctl_change);
5097 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5098 idev, &idev->cnf);
5099 }
5100
5101 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5102 {
5103 __addrconf_sysctl_unregister(&idev->cnf);
5104 neigh_sysctl_unregister(idev->nd_parms);
5105 }
5106
5107
5108 #endif
5109
5110 static int __net_init addrconf_init_net(struct net *net)
5111 {
5112 int err = -ENOMEM;
5113 struct ipv6_devconf *all, *dflt;
5114
5115 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5116 if (all == NULL)
5117 goto err_alloc_all;
5118
5119 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5120 if (dflt == NULL)
5121 goto err_alloc_dflt;
5122
5123 /* these will be inherited by all namespaces */
5124 dflt->autoconf = ipv6_defaults.autoconf;
5125 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5126
5127 net->ipv6.devconf_all = all;
5128 net->ipv6.devconf_dflt = dflt;
5129
5130 #ifdef CONFIG_SYSCTL
5131 err = __addrconf_sysctl_register(net, "all", NULL, all);
5132 if (err < 0)
5133 goto err_reg_all;
5134
5135 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5136 if (err < 0)
5137 goto err_reg_dflt;
5138 #endif
5139 return 0;
5140
5141 #ifdef CONFIG_SYSCTL
5142 err_reg_dflt:
5143 __addrconf_sysctl_unregister(all);
5144 err_reg_all:
5145 kfree(dflt);
5146 #endif
5147 err_alloc_dflt:
5148 kfree(all);
5149 err_alloc_all:
5150 return err;
5151 }
5152
5153 static void __net_exit addrconf_exit_net(struct net *net)
5154 {
5155 #ifdef CONFIG_SYSCTL
5156 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5157 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5158 #endif
5159 if (!net_eq(net, &init_net)) {
5160 kfree(net->ipv6.devconf_dflt);
5161 kfree(net->ipv6.devconf_all);
5162 }
5163 }
5164
5165 static struct pernet_operations addrconf_ops = {
5166 .init = addrconf_init_net,
5167 .exit = addrconf_exit_net,
5168 };
5169
5170 static struct rtnl_af_ops inet6_ops = {
5171 .family = AF_INET6,
5172 .fill_link_af = inet6_fill_link_af,
5173 .get_link_af_size = inet6_get_link_af_size,
5174 .set_link_af = inet6_set_link_af,
5175 };
5176
5177 /*
5178 * Init / cleanup code
5179 */
5180
5181 int __init addrconf_init(void)
5182 {
5183 int i, err;
5184
5185 err = ipv6_addr_label_init();
5186 if (err < 0) {
5187 pr_crit("%s: cannot initialize default policy table: %d\n",
5188 __func__, err);
5189 goto out;
5190 }
5191
5192 err = register_pernet_subsys(&addrconf_ops);
5193 if (err < 0)
5194 goto out_addrlabel;
5195
5196 /* The addrconf netdev notifier requires that loopback_dev
5197 * has it's ipv6 private information allocated and setup
5198 * before it can bring up and give link-local addresses
5199 * to other devices which are up.
5200 *
5201 * Unfortunately, loopback_dev is not necessarily the first
5202 * entry in the global dev_base list of net devices. In fact,
5203 * it is likely to be the very last entry on that list.
5204 * So this causes the notifier registry below to try and
5205 * give link-local addresses to all devices besides loopback_dev
5206 * first, then loopback_dev, which cases all the non-loopback_dev
5207 * devices to fail to get a link-local address.
5208 *
5209 * So, as a temporary fix, allocate the ipv6 structure for
5210 * loopback_dev first by hand.
5211 * Longer term, all of the dependencies ipv6 has upon the loopback
5212 * device and it being up should be removed.
5213 */
5214 rtnl_lock();
5215 if (!ipv6_add_dev(init_net.loopback_dev))
5216 err = -ENOMEM;
5217 rtnl_unlock();
5218 if (err)
5219 goto errlo;
5220
5221 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5222 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5223
5224 register_netdevice_notifier(&ipv6_dev_notf);
5225
5226 addrconf_verify(0);
5227
5228 rtnl_af_register(&inet6_ops);
5229
5230 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5231 NULL);
5232 if (err < 0)
5233 goto errout;
5234
5235 /* Only the first call to __rtnl_register can fail */
5236 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5237 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5238 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5239 inet6_dump_ifaddr, NULL);
5240 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5241 inet6_dump_ifmcaddr, NULL);
5242 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5243 inet6_dump_ifacaddr, NULL);
5244 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5245 inet6_netconf_dump_devconf, NULL);
5246
5247 ipv6_addr_label_rtnl_register();
5248
5249 return 0;
5250 errout:
5251 rtnl_af_unregister(&inet6_ops);
5252 unregister_netdevice_notifier(&ipv6_dev_notf);
5253 errlo:
5254 unregister_pernet_subsys(&addrconf_ops);
5255 out_addrlabel:
5256 ipv6_addr_label_cleanup();
5257 out:
5258 return err;
5259 }
5260
5261 void addrconf_cleanup(void)
5262 {
5263 struct net_device *dev;
5264 int i;
5265
5266 unregister_netdevice_notifier(&ipv6_dev_notf);
5267 unregister_pernet_subsys(&addrconf_ops);
5268 ipv6_addr_label_cleanup();
5269
5270 rtnl_lock();
5271
5272 __rtnl_af_unregister(&inet6_ops);
5273
5274 /* clean dev list */
5275 for_each_netdev(&init_net, dev) {
5276 if (__in6_dev_get(dev) == NULL)
5277 continue;
5278 addrconf_ifdown(dev, 1);
5279 }
5280 addrconf_ifdown(init_net.loopback_dev, 2);
5281
5282 /*
5283 * Check hash table.
5284 */
5285 spin_lock_bh(&addrconf_hash_lock);
5286 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5287 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5288 spin_unlock_bh(&addrconf_hash_lock);
5289
5290 del_timer(&addr_chk_timer);
5291 rtnl_unlock();
5292 }
Linux kernel - Deliverables
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