]> git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - net/ipv6/addrconf.c
projects / mirror_ubuntu-jammy-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
net: replace macros net_random and net_srandom with direct calls to prandom
[mirror_ubuntu-jammy-kernel.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/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're no addresses, delete prefix.
988 * 3) if there're 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 destinaion.
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 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2438 expires, flags);
2439 /*
2440 * Note that section 3.1 of RFC 4429 indicates
2441 * that the Optimistic flag should not be set for
2442 * manually configured addresses
2443 */
2444 addrconf_dad_start(ifp);
2445 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2446 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2447 true, jiffies);
2448 in6_ifa_put(ifp);
2449 addrconf_verify(0);
2450 return 0;
2451 }
2452
2453 return PTR_ERR(ifp);
2454 }
2455
2456 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2457 unsigned int plen)
2458 {
2459 struct inet6_ifaddr *ifp;
2460 struct inet6_dev *idev;
2461 struct net_device *dev;
2462
2463 if (plen > 128)
2464 return -EINVAL;
2465
2466 dev = __dev_get_by_index(net, ifindex);
2467 if (!dev)
2468 return -ENODEV;
2469
2470 if ((idev = __in6_dev_get(dev)) == NULL)
2471 return -ENXIO;
2472
2473 read_lock_bh(&idev->lock);
2474 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2475 if (ifp->prefix_len == plen &&
2476 ipv6_addr_equal(pfx, &ifp->addr)) {
2477 in6_ifa_hold(ifp);
2478 read_unlock_bh(&idev->lock);
2479
2480 ipv6_del_addr(ifp);
2481 return 0;
2482 }
2483 }
2484 read_unlock_bh(&idev->lock);
2485 return -EADDRNOTAVAIL;
2486 }
2487
2488
2489 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2490 {
2491 struct in6_ifreq ireq;
2492 int err;
2493
2494 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2495 return -EPERM;
2496
2497 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2498 return -EFAULT;
2499
2500 rtnl_lock();
2501 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2502 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2503 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2504 rtnl_unlock();
2505 return err;
2506 }
2507
2508 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2509 {
2510 struct in6_ifreq ireq;
2511 int err;
2512
2513 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2514 return -EPERM;
2515
2516 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2517 return -EFAULT;
2518
2519 rtnl_lock();
2520 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2521 ireq.ifr6_prefixlen);
2522 rtnl_unlock();
2523 return err;
2524 }
2525
2526 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2527 int plen, int scope)
2528 {
2529 struct inet6_ifaddr *ifp;
2530
2531 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2532 scope, IFA_F_PERMANENT,
2533 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2534 if (!IS_ERR(ifp)) {
2535 spin_lock_bh(&ifp->lock);
2536 ifp->flags &= ~IFA_F_TENTATIVE;
2537 spin_unlock_bh(&ifp->lock);
2538 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2539 in6_ifa_put(ifp);
2540 }
2541 }
2542
2543 #if IS_ENABLED(CONFIG_IPV6_SIT)
2544 static void sit_add_v4_addrs(struct inet6_dev *idev)
2545 {
2546 struct in6_addr addr;
2547 struct net_device *dev;
2548 struct net *net = dev_net(idev->dev);
2549 int scope, plen;
2550 u32 pflags = 0;
2551
2552 ASSERT_RTNL();
2553
2554 memset(&addr, 0, sizeof(struct in6_addr));
2555 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2556
2557 if (idev->dev->flags&IFF_POINTOPOINT) {
2558 addr.s6_addr32[0] = htonl(0xfe800000);
2559 scope = IFA_LINK;
2560 plen = 64;
2561 } else {
2562 scope = IPV6_ADDR_COMPATv4;
2563 plen = 96;
2564 pflags |= RTF_NONEXTHOP;
2565 }
2566
2567 if (addr.s6_addr32[3]) {
2568 add_addr(idev, &addr, plen, scope);
2569 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2570 return;
2571 }
2572
2573 for_each_netdev(net, dev) {
2574 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2575 if (in_dev && (dev->flags & IFF_UP)) {
2576 struct in_ifaddr *ifa;
2577
2578 int flag = scope;
2579
2580 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2581
2582 addr.s6_addr32[3] = ifa->ifa_local;
2583
2584 if (ifa->ifa_scope == RT_SCOPE_LINK)
2585 continue;
2586 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2587 if (idev->dev->flags&IFF_POINTOPOINT)
2588 continue;
2589 flag |= IFA_HOST;
2590 }
2591
2592 add_addr(idev, &addr, plen, flag);
2593 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2594 pflags);
2595 }
2596 }
2597 }
2598 }
2599 #endif
2600
2601 static void init_loopback(struct net_device *dev)
2602 {
2603 struct inet6_dev *idev;
2604 struct net_device *sp_dev;
2605 struct inet6_ifaddr *sp_ifa;
2606 struct rt6_info *sp_rt;
2607
2608 /* ::1 */
2609
2610 ASSERT_RTNL();
2611
2612 if ((idev = ipv6_find_idev(dev)) == NULL) {
2613 pr_debug("%s: add_dev failed\n", __func__);
2614 return;
2615 }
2616
2617 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2618
2619 /* Add routes to other interface's IPv6 addresses */
2620 for_each_netdev(dev_net(dev), sp_dev) {
2621 if (!strcmp(sp_dev->name, dev->name))
2622 continue;
2623
2624 idev = __in6_dev_get(sp_dev);
2625 if (!idev)
2626 continue;
2627
2628 read_lock_bh(&idev->lock);
2629 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2630
2631 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2632 continue;
2633
2634 if (sp_ifa->rt)
2635 continue;
2636
2637 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2638
2639 /* Failure cases are ignored */
2640 if (!IS_ERR(sp_rt)) {
2641 sp_ifa->rt = sp_rt;
2642 ip6_ins_rt(sp_rt);
2643 }
2644 }
2645 read_unlock_bh(&idev->lock);
2646 }
2647 }
2648
2649 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2650 {
2651 struct inet6_ifaddr *ifp;
2652 u32 addr_flags = IFA_F_PERMANENT;
2653
2654 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2655 if (idev->cnf.optimistic_dad &&
2656 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2657 addr_flags |= IFA_F_OPTIMISTIC;
2658 #endif
2659
2660
2661 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2662 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2663 if (!IS_ERR(ifp)) {
2664 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2665 addrconf_dad_start(ifp);
2666 in6_ifa_put(ifp);
2667 }
2668 }
2669
2670 static void addrconf_dev_config(struct net_device *dev)
2671 {
2672 struct in6_addr addr;
2673 struct inet6_dev *idev;
2674
2675 ASSERT_RTNL();
2676
2677 if ((dev->type != ARPHRD_ETHER) &&
2678 (dev->type != ARPHRD_FDDI) &&
2679 (dev->type != ARPHRD_ARCNET) &&
2680 (dev->type != ARPHRD_INFINIBAND) &&
2681 (dev->type != ARPHRD_IEEE802154) &&
2682 (dev->type != ARPHRD_IEEE1394) &&
2683 (dev->type != ARPHRD_TUNNEL6) &&
2684 (dev->type != ARPHRD_6LOWPAN)) {
2685 /* Alas, we support only Ethernet autoconfiguration. */
2686 return;
2687 }
2688
2689 idev = addrconf_add_dev(dev);
2690 if (IS_ERR(idev))
2691 return;
2692
2693 memset(&addr, 0, sizeof(struct in6_addr));
2694 addr.s6_addr32[0] = htonl(0xFE800000);
2695
2696 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2697 addrconf_add_linklocal(idev, &addr);
2698 }
2699
2700 #if IS_ENABLED(CONFIG_IPV6_SIT)
2701 static void addrconf_sit_config(struct net_device *dev)
2702 {
2703 struct inet6_dev *idev;
2704
2705 ASSERT_RTNL();
2706
2707 /*
2708 * Configure the tunnel with one of our IPv4
2709 * addresses... we should configure all of
2710 * our v4 addrs in the tunnel
2711 */
2712
2713 if ((idev = ipv6_find_idev(dev)) == NULL) {
2714 pr_debug("%s: add_dev failed\n", __func__);
2715 return;
2716 }
2717
2718 if (dev->priv_flags & IFF_ISATAP) {
2719 struct in6_addr addr;
2720
2721 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2722 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2723 addrconf_add_linklocal(idev, &addr);
2724 return;
2725 }
2726
2727 sit_add_v4_addrs(idev);
2728
2729 if (dev->flags&IFF_POINTOPOINT)
2730 addrconf_add_mroute(dev);
2731 }
2732 #endif
2733
2734 #if IS_ENABLED(CONFIG_NET_IPGRE)
2735 static void addrconf_gre_config(struct net_device *dev)
2736 {
2737 struct inet6_dev *idev;
2738 struct in6_addr addr;
2739
2740 ASSERT_RTNL();
2741
2742 if ((idev = ipv6_find_idev(dev)) == NULL) {
2743 pr_debug("%s: add_dev failed\n", __func__);
2744 return;
2745 }
2746
2747 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2748 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2749 addrconf_add_linklocal(idev, &addr);
2750 }
2751 #endif
2752
2753 static inline int
2754 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2755 {
2756 struct in6_addr lladdr;
2757
2758 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2759 addrconf_add_linklocal(idev, &lladdr);
2760 return 0;
2761 }
2762 return -1;
2763 }
2764
2765 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2766 void *ptr)
2767 {
2768 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2769 struct inet6_dev *idev = __in6_dev_get(dev);
2770 int run_pending = 0;
2771 int err;
2772
2773 switch (event) {
2774 case NETDEV_REGISTER:
2775 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2776 idev = ipv6_add_dev(dev);
2777 if (!idev)
2778 return notifier_from_errno(-ENOMEM);
2779 }
2780 break;
2781
2782 case NETDEV_UP:
2783 case NETDEV_CHANGE:
2784 if (dev->flags & IFF_SLAVE)
2785 break;
2786
2787 if (event == NETDEV_UP) {
2788 if (!addrconf_qdisc_ok(dev)) {
2789 /* device is not ready yet. */
2790 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2791 dev->name);
2792 break;
2793 }
2794
2795 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2796 idev = ipv6_add_dev(dev);
2797
2798 if (idev) {
2799 idev->if_flags |= IF_READY;
2800 run_pending = 1;
2801 }
2802 } else {
2803 if (!addrconf_qdisc_ok(dev)) {
2804 /* device is still not ready. */
2805 break;
2806 }
2807
2808 if (idev) {
2809 if (idev->if_flags & IF_READY)
2810 /* device is already configured. */
2811 break;
2812 idev->if_flags |= IF_READY;
2813 }
2814
2815 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2816 dev->name);
2817
2818 run_pending = 1;
2819 }
2820
2821 switch (dev->type) {
2822 #if IS_ENABLED(CONFIG_IPV6_SIT)
2823 case ARPHRD_SIT:
2824 addrconf_sit_config(dev);
2825 break;
2826 #endif
2827 #if IS_ENABLED(CONFIG_NET_IPGRE)
2828 case ARPHRD_IPGRE:
2829 addrconf_gre_config(dev);
2830 break;
2831 #endif
2832 case ARPHRD_LOOPBACK:
2833 init_loopback(dev);
2834 break;
2835
2836 default:
2837 addrconf_dev_config(dev);
2838 break;
2839 }
2840
2841 if (idev) {
2842 if (run_pending)
2843 addrconf_dad_run(idev);
2844
2845 /*
2846 * If the MTU changed during the interface down,
2847 * when the interface up, the changed MTU must be
2848 * reflected in the idev as well as routers.
2849 */
2850 if (idev->cnf.mtu6 != dev->mtu &&
2851 dev->mtu >= IPV6_MIN_MTU) {
2852 rt6_mtu_change(dev, dev->mtu);
2853 idev->cnf.mtu6 = dev->mtu;
2854 }
2855 idev->tstamp = jiffies;
2856 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2857
2858 /*
2859 * If the changed mtu during down is lower than
2860 * IPV6_MIN_MTU stop IPv6 on this interface.
2861 */
2862 if (dev->mtu < IPV6_MIN_MTU)
2863 addrconf_ifdown(dev, 1);
2864 }
2865 break;
2866
2867 case NETDEV_CHANGEMTU:
2868 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2869 rt6_mtu_change(dev, dev->mtu);
2870 idev->cnf.mtu6 = dev->mtu;
2871 break;
2872 }
2873
2874 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2875 idev = ipv6_add_dev(dev);
2876 if (idev)
2877 break;
2878 }
2879
2880 /*
2881 * MTU falled under IPV6_MIN_MTU.
2882 * Stop IPv6 on this interface.
2883 */
2884
2885 case NETDEV_DOWN:
2886 case NETDEV_UNREGISTER:
2887 /*
2888 * Remove all addresses from this interface.
2889 */
2890 addrconf_ifdown(dev, event != NETDEV_DOWN);
2891 break;
2892
2893 case NETDEV_CHANGENAME:
2894 if (idev) {
2895 snmp6_unregister_dev(idev);
2896 addrconf_sysctl_unregister(idev);
2897 addrconf_sysctl_register(idev);
2898 err = snmp6_register_dev(idev);
2899 if (err)
2900 return notifier_from_errno(err);
2901 }
2902 break;
2903
2904 case NETDEV_PRE_TYPE_CHANGE:
2905 case NETDEV_POST_TYPE_CHANGE:
2906 addrconf_type_change(dev, event);
2907 break;
2908 }
2909
2910 return NOTIFY_OK;
2911 }
2912
2913 /*
2914 * addrconf module should be notified of a device going up
2915 */
2916 static struct notifier_block ipv6_dev_notf = {
2917 .notifier_call = addrconf_notify,
2918 };
2919
2920 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2921 {
2922 struct inet6_dev *idev;
2923 ASSERT_RTNL();
2924
2925 idev = __in6_dev_get(dev);
2926
2927 if (event == NETDEV_POST_TYPE_CHANGE)
2928 ipv6_mc_remap(idev);
2929 else if (event == NETDEV_PRE_TYPE_CHANGE)
2930 ipv6_mc_unmap(idev);
2931 }
2932
2933 static int addrconf_ifdown(struct net_device *dev, int how)
2934 {
2935 struct net *net = dev_net(dev);
2936 struct inet6_dev *idev;
2937 struct inet6_ifaddr *ifa;
2938 int state, i;
2939
2940 ASSERT_RTNL();
2941
2942 rt6_ifdown(net, dev);
2943 neigh_ifdown(&nd_tbl, dev);
2944
2945 idev = __in6_dev_get(dev);
2946 if (idev == NULL)
2947 return -ENODEV;
2948
2949 /*
2950 * Step 1: remove reference to ipv6 device from parent device.
2951 * Do not dev_put!
2952 */
2953 if (how) {
2954 idev->dead = 1;
2955
2956 /* protected by rtnl_lock */
2957 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2958
2959 /* Step 1.5: remove snmp6 entry */
2960 snmp6_unregister_dev(idev);
2961
2962 }
2963
2964 /* Step 2: clear hash table */
2965 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2966 struct hlist_head *h = &inet6_addr_lst[i];
2967
2968 spin_lock_bh(&addrconf_hash_lock);
2969 restart:
2970 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
2971 if (ifa->idev == idev) {
2972 hlist_del_init_rcu(&ifa->addr_lst);
2973 addrconf_del_dad_timer(ifa);
2974 goto restart;
2975 }
2976 }
2977 spin_unlock_bh(&addrconf_hash_lock);
2978 }
2979
2980 write_lock_bh(&idev->lock);
2981
2982 addrconf_del_rs_timer(idev);
2983
2984 /* Step 2: clear flags for stateless addrconf */
2985 if (!how)
2986 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2987
2988 if (how && del_timer(&idev->regen_timer))
2989 in6_dev_put(idev);
2990
2991 /* Step 3: clear tempaddr list */
2992 while (!list_empty(&idev->tempaddr_list)) {
2993 ifa = list_first_entry(&idev->tempaddr_list,
2994 struct inet6_ifaddr, tmp_list);
2995 list_del(&ifa->tmp_list);
2996 write_unlock_bh(&idev->lock);
2997 spin_lock_bh(&ifa->lock);
2998
2999 if (ifa->ifpub) {
3000 in6_ifa_put(ifa->ifpub);
3001 ifa->ifpub = NULL;
3002 }
3003 spin_unlock_bh(&ifa->lock);
3004 in6_ifa_put(ifa);
3005 write_lock_bh(&idev->lock);
3006 }
3007
3008 while (!list_empty(&idev->addr_list)) {
3009 ifa = list_first_entry(&idev->addr_list,
3010 struct inet6_ifaddr, if_list);
3011 addrconf_del_dad_timer(ifa);
3012
3013 list_del(&ifa->if_list);
3014
3015 write_unlock_bh(&idev->lock);
3016
3017 spin_lock_bh(&ifa->state_lock);
3018 state = ifa->state;
3019 ifa->state = INET6_IFADDR_STATE_DEAD;
3020 spin_unlock_bh(&ifa->state_lock);
3021
3022 if (state != INET6_IFADDR_STATE_DEAD) {
3023 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3024 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3025 }
3026 in6_ifa_put(ifa);
3027
3028 write_lock_bh(&idev->lock);
3029 }
3030
3031 write_unlock_bh(&idev->lock);
3032
3033 /* Step 5: Discard multicast list */
3034 if (how)
3035 ipv6_mc_destroy_dev(idev);
3036 else
3037 ipv6_mc_down(idev);
3038
3039 idev->tstamp = jiffies;
3040
3041 /* Last: Shot the device (if unregistered) */
3042 if (how) {
3043 addrconf_sysctl_unregister(idev);
3044 neigh_parms_release(&nd_tbl, idev->nd_parms);
3045 neigh_ifdown(&nd_tbl, dev);
3046 in6_dev_put(idev);
3047 }
3048 return 0;
3049 }
3050
3051 static void addrconf_rs_timer(unsigned long data)
3052 {
3053 struct inet6_dev *idev = (struct inet6_dev *)data;
3054 struct net_device *dev = idev->dev;
3055 struct in6_addr lladdr;
3056
3057 write_lock(&idev->lock);
3058 if (idev->dead || !(idev->if_flags & IF_READY))
3059 goto out;
3060
3061 if (!ipv6_accept_ra(idev))
3062 goto out;
3063
3064 /* Announcement received after solicitation was sent */
3065 if (idev->if_flags & IF_RA_RCVD)
3066 goto out;
3067
3068 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3069 write_unlock(&idev->lock);
3070 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3071 ndisc_send_rs(dev, &lladdr,
3072 &in6addr_linklocal_allrouters);
3073 else
3074 goto put;
3075
3076 write_lock(&idev->lock);
3077 /* The wait after the last probe can be shorter */
3078 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3079 idev->cnf.rtr_solicits) ?
3080 idev->cnf.rtr_solicit_delay :
3081 idev->cnf.rtr_solicit_interval);
3082 } else {
3083 /*
3084 * Note: we do not support deprecated "all on-link"
3085 * assumption any longer.
3086 */
3087 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3088 }
3089
3090 out:
3091 write_unlock(&idev->lock);
3092 put:
3093 in6_dev_put(idev);
3094 }
3095
3096 /*
3097 * Duplicate Address Detection
3098 */
3099 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3100 {
3101 unsigned long rand_num;
3102 struct inet6_dev *idev = ifp->idev;
3103
3104 if (ifp->flags & IFA_F_OPTIMISTIC)
3105 rand_num = 0;
3106 else
3107 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3108
3109 ifp->dad_probes = idev->cnf.dad_transmits;
3110 addrconf_mod_dad_timer(ifp, rand_num);
3111 }
3112
3113 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3114 {
3115 struct inet6_dev *idev = ifp->idev;
3116 struct net_device *dev = idev->dev;
3117
3118 addrconf_join_solict(dev, &ifp->addr);
3119
3120 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3121
3122 read_lock_bh(&idev->lock);
3123 spin_lock(&ifp->lock);
3124 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3125 goto out;
3126
3127 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3128 idev->cnf.accept_dad < 1 ||
3129 !(ifp->flags&IFA_F_TENTATIVE) ||
3130 ifp->flags & IFA_F_NODAD) {
3131 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3132 spin_unlock(&ifp->lock);
3133 read_unlock_bh(&idev->lock);
3134
3135 addrconf_dad_completed(ifp);
3136 return;
3137 }
3138
3139 if (!(idev->if_flags & IF_READY)) {
3140 spin_unlock(&ifp->lock);
3141 read_unlock_bh(&idev->lock);
3142 /*
3143 * If the device is not ready:
3144 * - keep it tentative if it is a permanent address.
3145 * - otherwise, kill it.
3146 */
3147 in6_ifa_hold(ifp);
3148 addrconf_dad_stop(ifp, 0);
3149 return;
3150 }
3151
3152 /*
3153 * Optimistic nodes can start receiving
3154 * Frames right away
3155 */
3156 if (ifp->flags & IFA_F_OPTIMISTIC)
3157 ip6_ins_rt(ifp->rt);
3158
3159 addrconf_dad_kick(ifp);
3160 out:
3161 spin_unlock(&ifp->lock);
3162 read_unlock_bh(&idev->lock);
3163 }
3164
3165 static void addrconf_dad_timer(unsigned long data)
3166 {
3167 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3168 struct inet6_dev *idev = ifp->idev;
3169 struct in6_addr mcaddr;
3170
3171 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3172 goto out;
3173
3174 write_lock(&idev->lock);
3175 if (idev->dead || !(idev->if_flags & IF_READY)) {
3176 write_unlock(&idev->lock);
3177 goto out;
3178 }
3179
3180 spin_lock(&ifp->lock);
3181 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3182 spin_unlock(&ifp->lock);
3183 write_unlock(&idev->lock);
3184 goto out;
3185 }
3186
3187 if (ifp->dad_probes == 0) {
3188 /*
3189 * DAD was successful
3190 */
3191
3192 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3193 spin_unlock(&ifp->lock);
3194 write_unlock(&idev->lock);
3195
3196 addrconf_dad_completed(ifp);
3197
3198 goto out;
3199 }
3200
3201 ifp->dad_probes--;
3202 addrconf_mod_dad_timer(ifp,
3203 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3204 spin_unlock(&ifp->lock);
3205 write_unlock(&idev->lock);
3206
3207 /* send a neighbour solicitation for our addr */
3208 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3209 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3210 out:
3211 in6_ifa_put(ifp);
3212 }
3213
3214 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3215 {
3216 struct net_device *dev = ifp->idev->dev;
3217 struct in6_addr lladdr;
3218 bool send_rs, send_mld;
3219
3220 addrconf_del_dad_timer(ifp);
3221
3222 /*
3223 * Configure the address for reception. Now it is valid.
3224 */
3225
3226 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3227
3228 /* If added prefix is link local and we are prepared to process
3229 router advertisements, start sending router solicitations.
3230 */
3231
3232 read_lock_bh(&ifp->idev->lock);
3233 spin_lock(&ifp->lock);
3234 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3235 ifp->idev->valid_ll_addr_cnt == 1;
3236 send_rs = send_mld &&
3237 ipv6_accept_ra(ifp->idev) &&
3238 ifp->idev->cnf.rtr_solicits > 0 &&
3239 (dev->flags&IFF_LOOPBACK) == 0;
3240 spin_unlock(&ifp->lock);
3241 read_unlock_bh(&ifp->idev->lock);
3242
3243 /* While dad is in progress mld report's source address is in6_addrany.
3244 * Resend with proper ll now.
3245 */
3246 if (send_mld)
3247 ipv6_mc_dad_complete(ifp->idev);
3248
3249 if (send_rs) {
3250 /*
3251 * If a host as already performed a random delay
3252 * [...] as part of DAD [...] there is no need
3253 * to delay again before sending the first RS
3254 */
3255 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3256 return;
3257 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3258
3259 write_lock_bh(&ifp->idev->lock);
3260 spin_lock(&ifp->lock);
3261 ifp->idev->rs_probes = 1;
3262 ifp->idev->if_flags |= IF_RS_SENT;
3263 addrconf_mod_rs_timer(ifp->idev,
3264 ifp->idev->cnf.rtr_solicit_interval);
3265 spin_unlock(&ifp->lock);
3266 write_unlock_bh(&ifp->idev->lock);
3267 }
3268 }
3269
3270 static void addrconf_dad_run(struct inet6_dev *idev)
3271 {
3272 struct inet6_ifaddr *ifp;
3273
3274 read_lock_bh(&idev->lock);
3275 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3276 spin_lock(&ifp->lock);
3277 if (ifp->flags & IFA_F_TENTATIVE &&
3278 ifp->state == INET6_IFADDR_STATE_DAD)
3279 addrconf_dad_kick(ifp);
3280 spin_unlock(&ifp->lock);
3281 }
3282 read_unlock_bh(&idev->lock);
3283 }
3284
3285 #ifdef CONFIG_PROC_FS
3286 struct if6_iter_state {
3287 struct seq_net_private p;
3288 int bucket;
3289 int offset;
3290 };
3291
3292 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3293 {
3294 struct inet6_ifaddr *ifa = NULL;
3295 struct if6_iter_state *state = seq->private;
3296 struct net *net = seq_file_net(seq);
3297 int p = 0;
3298
3299 /* initial bucket if pos is 0 */
3300 if (pos == 0) {
3301 state->bucket = 0;
3302 state->offset = 0;
3303 }
3304
3305 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3306 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3307 addr_lst) {
3308 if (!net_eq(dev_net(ifa->idev->dev), net))
3309 continue;
3310 /* sync with offset */
3311 if (p < state->offset) {
3312 p++;
3313 continue;
3314 }
3315 state->offset++;
3316 return ifa;
3317 }
3318
3319 /* prepare for next bucket */
3320 state->offset = 0;
3321 p = 0;
3322 }
3323 return NULL;
3324 }
3325
3326 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3327 struct inet6_ifaddr *ifa)
3328 {
3329 struct if6_iter_state *state = seq->private;
3330 struct net *net = seq_file_net(seq);
3331
3332 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3333 if (!net_eq(dev_net(ifa->idev->dev), net))
3334 continue;
3335 state->offset++;
3336 return ifa;
3337 }
3338
3339 while (++state->bucket < IN6_ADDR_HSIZE) {
3340 state->offset = 0;
3341 hlist_for_each_entry_rcu_bh(ifa,
3342 &inet6_addr_lst[state->bucket], addr_lst) {
3343 if (!net_eq(dev_net(ifa->idev->dev), net))
3344 continue;
3345 state->offset++;
3346 return ifa;
3347 }
3348 }
3349
3350 return NULL;
3351 }
3352
3353 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3354 __acquires(rcu_bh)
3355 {
3356 rcu_read_lock_bh();
3357 return if6_get_first(seq, *pos);
3358 }
3359
3360 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3361 {
3362 struct inet6_ifaddr *ifa;
3363
3364 ifa = if6_get_next(seq, v);
3365 ++*pos;
3366 return ifa;
3367 }
3368
3369 static void if6_seq_stop(struct seq_file *seq, void *v)
3370 __releases(rcu_bh)
3371 {
3372 rcu_read_unlock_bh();
3373 }
3374
3375 static int if6_seq_show(struct seq_file *seq, void *v)
3376 {
3377 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3378 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3379 &ifp->addr,
3380 ifp->idev->dev->ifindex,
3381 ifp->prefix_len,
3382 ifp->scope,
3383 (u8) ifp->flags,
3384 ifp->idev->dev->name);
3385 return 0;
3386 }
3387
3388 static const struct seq_operations if6_seq_ops = {
3389 .start = if6_seq_start,
3390 .next = if6_seq_next,
3391 .show = if6_seq_show,
3392 .stop = if6_seq_stop,
3393 };
3394
3395 static int if6_seq_open(struct inode *inode, struct file *file)
3396 {
3397 return seq_open_net(inode, file, &if6_seq_ops,
3398 sizeof(struct if6_iter_state));
3399 }
3400
3401 static const struct file_operations if6_fops = {
3402 .owner = THIS_MODULE,
3403 .open = if6_seq_open,
3404 .read = seq_read,
3405 .llseek = seq_lseek,
3406 .release = seq_release_net,
3407 };
3408
3409 static int __net_init if6_proc_net_init(struct net *net)
3410 {
3411 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3412 return -ENOMEM;
3413 return 0;
3414 }
3415
3416 static void __net_exit if6_proc_net_exit(struct net *net)
3417 {
3418 remove_proc_entry("if_inet6", net->proc_net);
3419 }
3420
3421 static struct pernet_operations if6_proc_net_ops = {
3422 .init = if6_proc_net_init,
3423 .exit = if6_proc_net_exit,
3424 };
3425
3426 int __init if6_proc_init(void)
3427 {
3428 return register_pernet_subsys(&if6_proc_net_ops);
3429 }
3430
3431 void if6_proc_exit(void)
3432 {
3433 unregister_pernet_subsys(&if6_proc_net_ops);
3434 }
3435 #endif /* CONFIG_PROC_FS */
3436
3437 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3438 /* Check if address is a home address configured on any interface. */
3439 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3440 {
3441 int ret = 0;
3442 struct inet6_ifaddr *ifp = NULL;
3443 unsigned int hash = inet6_addr_hash(addr);
3444
3445 rcu_read_lock_bh();
3446 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3447 if (!net_eq(dev_net(ifp->idev->dev), net))
3448 continue;
3449 if (ipv6_addr_equal(&ifp->addr, addr) &&
3450 (ifp->flags & IFA_F_HOMEADDRESS)) {
3451 ret = 1;
3452 break;
3453 }
3454 }
3455 rcu_read_unlock_bh();
3456 return ret;
3457 }
3458 #endif
3459
3460 /*
3461 * Periodic address status verification
3462 */
3463
3464 static void addrconf_verify(unsigned long foo)
3465 {
3466 unsigned long now, next, next_sec, next_sched;
3467 struct inet6_ifaddr *ifp;
3468 int i;
3469
3470 rcu_read_lock_bh();
3471 spin_lock(&addrconf_verify_lock);
3472 now = jiffies;
3473 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3474
3475 del_timer(&addr_chk_timer);
3476
3477 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3478 restart:
3479 hlist_for_each_entry_rcu_bh(ifp,
3480 &inet6_addr_lst[i], addr_lst) {
3481 unsigned long age;
3482
3483 /* When setting preferred_lft to a value not zero or
3484 * infinity, while valid_lft is infinity
3485 * IFA_F_PERMANENT has a non-infinity life time.
3486 */
3487 if ((ifp->flags & IFA_F_PERMANENT) &&
3488 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3489 continue;
3490
3491 spin_lock(&ifp->lock);
3492 /* We try to batch several events at once. */
3493 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3494
3495 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3496 age >= ifp->valid_lft) {
3497 spin_unlock(&ifp->lock);
3498 in6_ifa_hold(ifp);
3499 ipv6_del_addr(ifp);
3500 goto restart;
3501 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3502 spin_unlock(&ifp->lock);
3503 continue;
3504 } else if (age >= ifp->prefered_lft) {
3505 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3506 int deprecate = 0;
3507
3508 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3509 deprecate = 1;
3510 ifp->flags |= IFA_F_DEPRECATED;
3511 }
3512
3513 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3514 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3515 next = ifp->tstamp + ifp->valid_lft * HZ;
3516
3517 spin_unlock(&ifp->lock);
3518
3519 if (deprecate) {
3520 in6_ifa_hold(ifp);
3521
3522 ipv6_ifa_notify(0, ifp);
3523 in6_ifa_put(ifp);
3524 goto restart;
3525 }
3526 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3527 !(ifp->flags&IFA_F_TENTATIVE)) {
3528 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3529 ifp->idev->cnf.dad_transmits *
3530 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3531
3532 if (age >= ifp->prefered_lft - regen_advance) {
3533 struct inet6_ifaddr *ifpub = ifp->ifpub;
3534 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3535 next = ifp->tstamp + ifp->prefered_lft * HZ;
3536 if (!ifp->regen_count && ifpub) {
3537 ifp->regen_count++;
3538 in6_ifa_hold(ifp);
3539 in6_ifa_hold(ifpub);
3540 spin_unlock(&ifp->lock);
3541
3542 spin_lock(&ifpub->lock);
3543 ifpub->regen_count = 0;
3544 spin_unlock(&ifpub->lock);
3545 ipv6_create_tempaddr(ifpub, ifp);
3546 in6_ifa_put(ifpub);
3547 in6_ifa_put(ifp);
3548 goto restart;
3549 }
3550 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3551 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3552 spin_unlock(&ifp->lock);
3553 } else {
3554 /* ifp->prefered_lft <= ifp->valid_lft */
3555 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3556 next = ifp->tstamp + ifp->prefered_lft * HZ;
3557 spin_unlock(&ifp->lock);
3558 }
3559 }
3560 }
3561
3562 next_sec = round_jiffies_up(next);
3563 next_sched = next;
3564
3565 /* If rounded timeout is accurate enough, accept it. */
3566 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3567 next_sched = next_sec;
3568
3569 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3570 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3571 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3572
3573 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3574 now, next, next_sec, next_sched);
3575
3576 addr_chk_timer.expires = next_sched;
3577 add_timer(&addr_chk_timer);
3578 spin_unlock(&addrconf_verify_lock);
3579 rcu_read_unlock_bh();
3580 }
3581
3582 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3583 struct in6_addr **peer_pfx)
3584 {
3585 struct in6_addr *pfx = NULL;
3586
3587 *peer_pfx = NULL;
3588
3589 if (addr)
3590 pfx = nla_data(addr);
3591
3592 if (local) {
3593 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3594 *peer_pfx = pfx;
3595 pfx = nla_data(local);
3596 }
3597
3598 return pfx;
3599 }
3600
3601 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3602 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3603 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3604 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3605 [IFA_FLAGS] = { .len = sizeof(u32) },
3606 };
3607
3608 static int
3609 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3610 {
3611 struct net *net = sock_net(skb->sk);
3612 struct ifaddrmsg *ifm;
3613 struct nlattr *tb[IFA_MAX+1];
3614 struct in6_addr *pfx, *peer_pfx;
3615 int err;
3616
3617 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3618 if (err < 0)
3619 return err;
3620
3621 ifm = nlmsg_data(nlh);
3622 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3623 if (pfx == NULL)
3624 return -EINVAL;
3625
3626 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3627 }
3628
3629 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
3630 u32 prefered_lft, u32 valid_lft)
3631 {
3632 u32 flags;
3633 clock_t expires;
3634 unsigned long timeout;
3635 bool was_managetempaddr;
3636
3637 if (!valid_lft || (prefered_lft > valid_lft))
3638 return -EINVAL;
3639
3640 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3641 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3642 return -EINVAL;
3643
3644 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3645 if (addrconf_finite_timeout(timeout)) {
3646 expires = jiffies_to_clock_t(timeout * HZ);
3647 valid_lft = timeout;
3648 flags = RTF_EXPIRES;
3649 } else {
3650 expires = 0;
3651 flags = 0;
3652 ifa_flags |= IFA_F_PERMANENT;
3653 }
3654
3655 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3656 if (addrconf_finite_timeout(timeout)) {
3657 if (timeout == 0)
3658 ifa_flags |= IFA_F_DEPRECATED;
3659 prefered_lft = timeout;
3660 }
3661
3662 spin_lock_bh(&ifp->lock);
3663 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
3664 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
3665 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR);
3666 ifp->flags |= ifa_flags;
3667 ifp->tstamp = jiffies;
3668 ifp->valid_lft = valid_lft;
3669 ifp->prefered_lft = prefered_lft;
3670
3671 spin_unlock_bh(&ifp->lock);
3672 if (!(ifp->flags&IFA_F_TENTATIVE))
3673 ipv6_ifa_notify(0, ifp);
3674
3675 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3676 expires, flags);
3677
3678 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3679 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3680 valid_lft = prefered_lft = 0;
3681 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3682 !was_managetempaddr, jiffies);
3683 }
3684
3685 addrconf_verify(0);
3686
3687 return 0;
3688 }
3689
3690 static int
3691 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3692 {
3693 struct net *net = sock_net(skb->sk);
3694 struct ifaddrmsg *ifm;
3695 struct nlattr *tb[IFA_MAX+1];
3696 struct in6_addr *pfx, *peer_pfx;
3697 struct inet6_ifaddr *ifa;
3698 struct net_device *dev;
3699 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3700 u32 ifa_flags;
3701 int err;
3702
3703 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3704 if (err < 0)
3705 return err;
3706
3707 ifm = nlmsg_data(nlh);
3708 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3709 if (pfx == NULL)
3710 return -EINVAL;
3711
3712 if (tb[IFA_CACHEINFO]) {
3713 struct ifa_cacheinfo *ci;
3714
3715 ci = nla_data(tb[IFA_CACHEINFO]);
3716 valid_lft = ci->ifa_valid;
3717 preferred_lft = ci->ifa_prefered;
3718 } else {
3719 preferred_lft = INFINITY_LIFE_TIME;
3720 valid_lft = INFINITY_LIFE_TIME;
3721 }
3722
3723 dev = __dev_get_by_index(net, ifm->ifa_index);
3724 if (dev == NULL)
3725 return -ENODEV;
3726
3727 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3728
3729 /* We ignore other flags so far. */
3730 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR;
3731
3732 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3733 if (ifa == NULL) {
3734 /*
3735 * It would be best to check for !NLM_F_CREATE here but
3736 * userspace alreay relies on not having to provide this.
3737 */
3738 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3739 ifm->ifa_prefixlen, ifa_flags,
3740 preferred_lft, valid_lft);
3741 }
3742
3743 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3744 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3745 err = -EEXIST;
3746 else
3747 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3748
3749 in6_ifa_put(ifa);
3750
3751 return err;
3752 }
3753
3754 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
3755 u8 scope, int ifindex)
3756 {
3757 struct ifaddrmsg *ifm;
3758
3759 ifm = nlmsg_data(nlh);
3760 ifm->ifa_family = AF_INET6;
3761 ifm->ifa_prefixlen = prefixlen;
3762 ifm->ifa_flags = flags;
3763 ifm->ifa_scope = scope;
3764 ifm->ifa_index = ifindex;
3765 }
3766
3767 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3768 unsigned long tstamp, u32 preferred, u32 valid)
3769 {
3770 struct ifa_cacheinfo ci;
3771
3772 ci.cstamp = cstamp_delta(cstamp);
3773 ci.tstamp = cstamp_delta(tstamp);
3774 ci.ifa_prefered = preferred;
3775 ci.ifa_valid = valid;
3776
3777 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3778 }
3779
3780 static inline int rt_scope(int ifa_scope)
3781 {
3782 if (ifa_scope & IFA_HOST)
3783 return RT_SCOPE_HOST;
3784 else if (ifa_scope & IFA_LINK)
3785 return RT_SCOPE_LINK;
3786 else if (ifa_scope & IFA_SITE)
3787 return RT_SCOPE_SITE;
3788 else
3789 return RT_SCOPE_UNIVERSE;
3790 }
3791
3792 static inline int inet6_ifaddr_msgsize(void)
3793 {
3794 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3795 + nla_total_size(16) /* IFA_LOCAL */
3796 + nla_total_size(16) /* IFA_ADDRESS */
3797 + nla_total_size(sizeof(struct ifa_cacheinfo))
3798 + nla_total_size(4) /* IFA_FLAGS */;
3799 }
3800
3801 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3802 u32 portid, u32 seq, int event, unsigned int flags)
3803 {
3804 struct nlmsghdr *nlh;
3805 u32 preferred, valid;
3806
3807 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3808 if (nlh == NULL)
3809 return -EMSGSIZE;
3810
3811 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3812 ifa->idev->dev->ifindex);
3813
3814 if (!((ifa->flags&IFA_F_PERMANENT) &&
3815 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
3816 preferred = ifa->prefered_lft;
3817 valid = ifa->valid_lft;
3818 if (preferred != INFINITY_LIFE_TIME) {
3819 long tval = (jiffies - ifa->tstamp)/HZ;
3820 if (preferred > tval)
3821 preferred -= tval;
3822 else
3823 preferred = 0;
3824 if (valid != INFINITY_LIFE_TIME) {
3825 if (valid > tval)
3826 valid -= tval;
3827 else
3828 valid = 0;
3829 }
3830 }
3831 } else {
3832 preferred = INFINITY_LIFE_TIME;
3833 valid = INFINITY_LIFE_TIME;
3834 }
3835
3836 if (!ipv6_addr_any(&ifa->peer_addr)) {
3837 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3838 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3839 goto error;
3840 } else
3841 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3842 goto error;
3843
3844 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3845 goto error;
3846
3847 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
3848 goto error;
3849
3850 return nlmsg_end(skb, nlh);
3851
3852 error:
3853 nlmsg_cancel(skb, nlh);
3854 return -EMSGSIZE;
3855 }
3856
3857 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3858 u32 portid, u32 seq, int event, u16 flags)
3859 {
3860 struct nlmsghdr *nlh;
3861 u8 scope = RT_SCOPE_UNIVERSE;
3862 int ifindex = ifmca->idev->dev->ifindex;
3863
3864 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3865 scope = RT_SCOPE_SITE;
3866
3867 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3868 if (nlh == NULL)
3869 return -EMSGSIZE;
3870
3871 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3872 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3873 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3874 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3875 nlmsg_cancel(skb, nlh);
3876 return -EMSGSIZE;
3877 }
3878
3879 return nlmsg_end(skb, nlh);
3880 }
3881
3882 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3883 u32 portid, u32 seq, int event, unsigned int flags)
3884 {
3885 struct nlmsghdr *nlh;
3886 u8 scope = RT_SCOPE_UNIVERSE;
3887 int ifindex = ifaca->aca_idev->dev->ifindex;
3888
3889 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3890 scope = RT_SCOPE_SITE;
3891
3892 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3893 if (nlh == NULL)
3894 return -EMSGSIZE;
3895
3896 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3897 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3898 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3899 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3900 nlmsg_cancel(skb, nlh);
3901 return -EMSGSIZE;
3902 }
3903
3904 return nlmsg_end(skb, nlh);
3905 }
3906
3907 enum addr_type_t {
3908 UNICAST_ADDR,
3909 MULTICAST_ADDR,
3910 ANYCAST_ADDR,
3911 };
3912
3913 /* called with rcu_read_lock() */
3914 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3915 struct netlink_callback *cb, enum addr_type_t type,
3916 int s_ip_idx, int *p_ip_idx)
3917 {
3918 struct ifmcaddr6 *ifmca;
3919 struct ifacaddr6 *ifaca;
3920 int err = 1;
3921 int ip_idx = *p_ip_idx;
3922
3923 read_lock_bh(&idev->lock);
3924 switch (type) {
3925 case UNICAST_ADDR: {
3926 struct inet6_ifaddr *ifa;
3927
3928 /* unicast address incl. temp addr */
3929 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3930 if (++ip_idx < s_ip_idx)
3931 continue;
3932 err = inet6_fill_ifaddr(skb, ifa,
3933 NETLINK_CB(cb->skb).portid,
3934 cb->nlh->nlmsg_seq,
3935 RTM_NEWADDR,
3936 NLM_F_MULTI);
3937 if (err <= 0)
3938 break;
3939 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3940 }
3941 break;
3942 }
3943 case MULTICAST_ADDR:
3944 /* multicast address */
3945 for (ifmca = idev->mc_list; ifmca;
3946 ifmca = ifmca->next, ip_idx++) {
3947 if (ip_idx < s_ip_idx)
3948 continue;
3949 err = inet6_fill_ifmcaddr(skb, ifmca,
3950 NETLINK_CB(cb->skb).portid,
3951 cb->nlh->nlmsg_seq,
3952 RTM_GETMULTICAST,
3953 NLM_F_MULTI);
3954 if (err <= 0)
3955 break;
3956 }
3957 break;
3958 case ANYCAST_ADDR:
3959 /* anycast address */
3960 for (ifaca = idev->ac_list; ifaca;
3961 ifaca = ifaca->aca_next, ip_idx++) {
3962 if (ip_idx < s_ip_idx)
3963 continue;
3964 err = inet6_fill_ifacaddr(skb, ifaca,
3965 NETLINK_CB(cb->skb).portid,
3966 cb->nlh->nlmsg_seq,
3967 RTM_GETANYCAST,
3968 NLM_F_MULTI);
3969 if (err <= 0)
3970 break;
3971 }
3972 break;
3973 default:
3974 break;
3975 }
3976 read_unlock_bh(&idev->lock);
3977 *p_ip_idx = ip_idx;
3978 return err;
3979 }
3980
3981 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3982 enum addr_type_t type)
3983 {
3984 struct net *net = sock_net(skb->sk);
3985 int h, s_h;
3986 int idx, ip_idx;
3987 int s_idx, s_ip_idx;
3988 struct net_device *dev;
3989 struct inet6_dev *idev;
3990 struct hlist_head *head;
3991
3992 s_h = cb->args[0];
3993 s_idx = idx = cb->args[1];
3994 s_ip_idx = ip_idx = cb->args[2];
3995
3996 rcu_read_lock();
3997 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
3998 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3999 idx = 0;
4000 head = &net->dev_index_head[h];
4001 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4002 if (idx < s_idx)
4003 goto cont;
4004 if (h > s_h || idx > s_idx)
4005 s_ip_idx = 0;
4006 ip_idx = 0;
4007 idev = __in6_dev_get(dev);
4008 if (!idev)
4009 goto cont;
4010
4011 if (in6_dump_addrs(idev, skb, cb, type,
4012 s_ip_idx, &ip_idx) <= 0)
4013 goto done;
4014 cont:
4015 idx++;
4016 }
4017 }
4018 done:
4019 rcu_read_unlock();
4020 cb->args[0] = h;
4021 cb->args[1] = idx;
4022 cb->args[2] = ip_idx;
4023
4024 return skb->len;
4025 }
4026
4027 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4028 {
4029 enum addr_type_t type = UNICAST_ADDR;
4030
4031 return inet6_dump_addr(skb, cb, type);
4032 }
4033
4034 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4035 {
4036 enum addr_type_t type = MULTICAST_ADDR;
4037
4038 return inet6_dump_addr(skb, cb, type);
4039 }
4040
4041
4042 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4043 {
4044 enum addr_type_t type = ANYCAST_ADDR;
4045
4046 return inet6_dump_addr(skb, cb, type);
4047 }
4048
4049 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4050 {
4051 struct net *net = sock_net(in_skb->sk);
4052 struct ifaddrmsg *ifm;
4053 struct nlattr *tb[IFA_MAX+1];
4054 struct in6_addr *addr = NULL, *peer;
4055 struct net_device *dev = NULL;
4056 struct inet6_ifaddr *ifa;
4057 struct sk_buff *skb;
4058 int err;
4059
4060 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4061 if (err < 0)
4062 goto errout;
4063
4064 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4065 if (addr == NULL) {
4066 err = -EINVAL;
4067 goto errout;
4068 }
4069
4070 ifm = nlmsg_data(nlh);
4071 if (ifm->ifa_index)
4072 dev = __dev_get_by_index(net, ifm->ifa_index);
4073
4074 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4075 if (!ifa) {
4076 err = -EADDRNOTAVAIL;
4077 goto errout;
4078 }
4079
4080 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4081 if (!skb) {
4082 err = -ENOBUFS;
4083 goto errout_ifa;
4084 }
4085
4086 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4087 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4088 if (err < 0) {
4089 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4090 WARN_ON(err == -EMSGSIZE);
4091 kfree_skb(skb);
4092 goto errout_ifa;
4093 }
4094 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4095 errout_ifa:
4096 in6_ifa_put(ifa);
4097 errout:
4098 return err;
4099 }
4100
4101 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4102 {
4103 struct sk_buff *skb;
4104 struct net *net = dev_net(ifa->idev->dev);
4105 int err = -ENOBUFS;
4106
4107 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4108 if (skb == NULL)
4109 goto errout;
4110
4111 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4112 if (err < 0) {
4113 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4114 WARN_ON(err == -EMSGSIZE);
4115 kfree_skb(skb);
4116 goto errout;
4117 }
4118 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4119 return;
4120 errout:
4121 if (err < 0)
4122 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4123 }
4124
4125 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4126 __s32 *array, int bytes)
4127 {
4128 BUG_ON(bytes < (DEVCONF_MAX * 4));
4129
4130 memset(array, 0, bytes);
4131 array[DEVCONF_FORWARDING] = cnf->forwarding;
4132 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4133 array[DEVCONF_MTU6] = cnf->mtu6;
4134 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4135 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4136 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4137 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4138 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4139 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4140 jiffies_to_msecs(cnf->rtr_solicit_interval);
4141 array[DEVCONF_RTR_SOLICIT_DELAY] =
4142 jiffies_to_msecs(cnf->rtr_solicit_delay);
4143 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4144 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4145 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4146 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4147 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4148 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4149 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4150 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4151 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4152 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4153 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4154 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4155 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4156 #ifdef CONFIG_IPV6_ROUTER_PREF
4157 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4158 array[DEVCONF_RTR_PROBE_INTERVAL] =
4159 jiffies_to_msecs(cnf->rtr_probe_interval);
4160 #ifdef CONFIG_IPV6_ROUTE_INFO
4161 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4162 #endif
4163 #endif
4164 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4165 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4166 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4167 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4168 #endif
4169 #ifdef CONFIG_IPV6_MROUTE
4170 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4171 #endif
4172 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4173 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4174 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4175 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4176 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4177 }
4178
4179 static inline size_t inet6_ifla6_size(void)
4180 {
4181 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4182 + nla_total_size(sizeof(struct ifla_cacheinfo))
4183 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4184 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4185 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4186 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4187 }
4188
4189 static inline size_t inet6_if_nlmsg_size(void)
4190 {
4191 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4192 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4193 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4194 + nla_total_size(4) /* IFLA_MTU */
4195 + nla_total_size(4) /* IFLA_LINK */
4196 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4197 }
4198
4199 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4200 int items, int bytes)
4201 {
4202 int i;
4203 int pad = bytes - sizeof(u64) * items;
4204 BUG_ON(pad < 0);
4205
4206 /* Use put_unaligned() because stats may not be aligned for u64. */
4207 put_unaligned(items, &stats[0]);
4208 for (i = 1; i < items; i++)
4209 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4210
4211 memset(&stats[items], 0, pad);
4212 }
4213
4214 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4215 int items, int bytes, size_t syncpoff)
4216 {
4217 int i;
4218 int pad = bytes - sizeof(u64) * items;
4219 BUG_ON(pad < 0);
4220
4221 /* Use put_unaligned() because stats may not be aligned for u64. */
4222 put_unaligned(items, &stats[0]);
4223 for (i = 1; i < items; i++)
4224 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4225
4226 memset(&stats[items], 0, pad);
4227 }
4228
4229 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4230 int bytes)
4231 {
4232 switch (attrtype) {
4233 case IFLA_INET6_STATS:
4234 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4235 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4236 break;
4237 case IFLA_INET6_ICMP6STATS:
4238 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4239 break;
4240 }
4241 }
4242
4243 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4244 {
4245 struct nlattr *nla;
4246 struct ifla_cacheinfo ci;
4247
4248 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4249 goto nla_put_failure;
4250 ci.max_reasm_len = IPV6_MAXPLEN;
4251 ci.tstamp = cstamp_delta(idev->tstamp);
4252 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4253 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4254 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4255 goto nla_put_failure;
4256 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4257 if (nla == NULL)
4258 goto nla_put_failure;
4259 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4260
4261 /* XXX - MC not implemented */
4262
4263 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4264 if (nla == NULL)
4265 goto nla_put_failure;
4266 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4267
4268 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4269 if (nla == NULL)
4270 goto nla_put_failure;
4271 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4272
4273 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4274 if (nla == NULL)
4275 goto nla_put_failure;
4276 read_lock_bh(&idev->lock);
4277 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4278 read_unlock_bh(&idev->lock);
4279
4280 return 0;
4281
4282 nla_put_failure:
4283 return -EMSGSIZE;
4284 }
4285
4286 static size_t inet6_get_link_af_size(const struct net_device *dev)
4287 {
4288 if (!__in6_dev_get(dev))
4289 return 0;
4290
4291 return inet6_ifla6_size();
4292 }
4293
4294 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4295 {
4296 struct inet6_dev *idev = __in6_dev_get(dev);
4297
4298 if (!idev)
4299 return -ENODATA;
4300
4301 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4302 return -EMSGSIZE;
4303
4304 return 0;
4305 }
4306
4307 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4308 {
4309 struct inet6_ifaddr *ifp;
4310 struct net_device *dev = idev->dev;
4311 bool update_rs = false;
4312 struct in6_addr ll_addr;
4313
4314 if (token == NULL)
4315 return -EINVAL;
4316 if (ipv6_addr_any(token))
4317 return -EINVAL;
4318 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4319 return -EINVAL;
4320 if (!ipv6_accept_ra(idev))
4321 return -EINVAL;
4322 if (idev->cnf.rtr_solicits <= 0)
4323 return -EINVAL;
4324
4325 write_lock_bh(&idev->lock);
4326
4327 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4328 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4329
4330 write_unlock_bh(&idev->lock);
4331
4332 if (!idev->dead && (idev->if_flags & IF_READY) &&
4333 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4334 IFA_F_OPTIMISTIC)) {
4335
4336 /* If we're not ready, then normal ifup will take care
4337 * of this. Otherwise, we need to request our rs here.
4338 */
4339 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4340 update_rs = true;
4341 }
4342
4343 write_lock_bh(&idev->lock);
4344
4345 if (update_rs) {
4346 idev->if_flags |= IF_RS_SENT;
4347 idev->rs_probes = 1;
4348 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4349 }
4350
4351 /* Well, that's kinda nasty ... */
4352 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4353 spin_lock(&ifp->lock);
4354 if (ifp->tokenized) {
4355 ifp->valid_lft = 0;
4356 ifp->prefered_lft = 0;
4357 }
4358 spin_unlock(&ifp->lock);
4359 }
4360
4361 write_unlock_bh(&idev->lock);
4362 addrconf_verify(0);
4363 return 0;
4364 }
4365
4366 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4367 {
4368 int err = -EINVAL;
4369 struct inet6_dev *idev = __in6_dev_get(dev);
4370 struct nlattr *tb[IFLA_INET6_MAX + 1];
4371
4372 if (!idev)
4373 return -EAFNOSUPPORT;
4374
4375 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4376 BUG();
4377
4378 if (tb[IFLA_INET6_TOKEN])
4379 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4380
4381 return err;
4382 }
4383
4384 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4385 u32 portid, u32 seq, int event, unsigned int flags)
4386 {
4387 struct net_device *dev = idev->dev;
4388 struct ifinfomsg *hdr;
4389 struct nlmsghdr *nlh;
4390 void *protoinfo;
4391
4392 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4393 if (nlh == NULL)
4394 return -EMSGSIZE;
4395
4396 hdr = nlmsg_data(nlh);
4397 hdr->ifi_family = AF_INET6;
4398 hdr->__ifi_pad = 0;
4399 hdr->ifi_type = dev->type;
4400 hdr->ifi_index = dev->ifindex;
4401 hdr->ifi_flags = dev_get_flags(dev);
4402 hdr->ifi_change = 0;
4403
4404 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4405 (dev->addr_len &&
4406 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4407 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4408 (dev->ifindex != dev->iflink &&
4409 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4410 goto nla_put_failure;
4411 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4412 if (protoinfo == NULL)
4413 goto nla_put_failure;
4414
4415 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4416 goto nla_put_failure;
4417
4418 nla_nest_end(skb, protoinfo);
4419 return nlmsg_end(skb, nlh);
4420
4421 nla_put_failure:
4422 nlmsg_cancel(skb, nlh);
4423 return -EMSGSIZE;
4424 }
4425
4426 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4427 {
4428 struct net *net = sock_net(skb->sk);
4429 int h, s_h;
4430 int idx = 0, s_idx;
4431 struct net_device *dev;
4432 struct inet6_dev *idev;
4433 struct hlist_head *head;
4434
4435 s_h = cb->args[0];
4436 s_idx = cb->args[1];
4437
4438 rcu_read_lock();
4439 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4440 idx = 0;
4441 head = &net->dev_index_head[h];
4442 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4443 if (idx < s_idx)
4444 goto cont;
4445 idev = __in6_dev_get(dev);
4446 if (!idev)
4447 goto cont;
4448 if (inet6_fill_ifinfo(skb, idev,
4449 NETLINK_CB(cb->skb).portid,
4450 cb->nlh->nlmsg_seq,
4451 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4452 goto out;
4453 cont:
4454 idx++;
4455 }
4456 }
4457 out:
4458 rcu_read_unlock();
4459 cb->args[1] = idx;
4460 cb->args[0] = h;
4461
4462 return skb->len;
4463 }
4464
4465 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4466 {
4467 struct sk_buff *skb;
4468 struct net *net = dev_net(idev->dev);
4469 int err = -ENOBUFS;
4470
4471 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4472 if (skb == NULL)
4473 goto errout;
4474
4475 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4476 if (err < 0) {
4477 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4478 WARN_ON(err == -EMSGSIZE);
4479 kfree_skb(skb);
4480 goto errout;
4481 }
4482 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4483 return;
4484 errout:
4485 if (err < 0)
4486 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4487 }
4488
4489 static inline size_t inet6_prefix_nlmsg_size(void)
4490 {
4491 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4492 + nla_total_size(sizeof(struct in6_addr))
4493 + nla_total_size(sizeof(struct prefix_cacheinfo));
4494 }
4495
4496 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4497 struct prefix_info *pinfo, u32 portid, u32 seq,
4498 int event, unsigned int flags)
4499 {
4500 struct prefixmsg *pmsg;
4501 struct nlmsghdr *nlh;
4502 struct prefix_cacheinfo ci;
4503
4504 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4505 if (nlh == NULL)
4506 return -EMSGSIZE;
4507
4508 pmsg = nlmsg_data(nlh);
4509 pmsg->prefix_family = AF_INET6;
4510 pmsg->prefix_pad1 = 0;
4511 pmsg->prefix_pad2 = 0;
4512 pmsg->prefix_ifindex = idev->dev->ifindex;
4513 pmsg->prefix_len = pinfo->prefix_len;
4514 pmsg->prefix_type = pinfo->type;
4515 pmsg->prefix_pad3 = 0;
4516 pmsg->prefix_flags = 0;
4517 if (pinfo->onlink)
4518 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4519 if (pinfo->autoconf)
4520 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4521
4522 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4523 goto nla_put_failure;
4524 ci.preferred_time = ntohl(pinfo->prefered);
4525 ci.valid_time = ntohl(pinfo->valid);
4526 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4527 goto nla_put_failure;
4528 return nlmsg_end(skb, nlh);
4529
4530 nla_put_failure:
4531 nlmsg_cancel(skb, nlh);
4532 return -EMSGSIZE;
4533 }
4534
4535 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4536 struct prefix_info *pinfo)
4537 {
4538 struct sk_buff *skb;
4539 struct net *net = dev_net(idev->dev);
4540 int err = -ENOBUFS;
4541
4542 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4543 if (skb == NULL)
4544 goto errout;
4545
4546 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4547 if (err < 0) {
4548 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4549 WARN_ON(err == -EMSGSIZE);
4550 kfree_skb(skb);
4551 goto errout;
4552 }
4553 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4554 return;
4555 errout:
4556 if (err < 0)
4557 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4558 }
4559
4560 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4561 {
4562 write_lock_bh(&ifp->idev->lock);
4563 spin_lock(&ifp->lock);
4564 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4565 IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4566 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4567 ifp->idev->valid_ll_addr_cnt += count;
4568 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4569 spin_unlock(&ifp->lock);
4570 write_unlock_bh(&ifp->idev->lock);
4571 }
4572
4573 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4574 {
4575 struct net *net = dev_net(ifp->idev->dev);
4576
4577 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4578
4579 switch (event) {
4580 case RTM_NEWADDR:
4581 update_valid_ll_addr_cnt(ifp, 1);
4582
4583 /*
4584 * If the address was optimistic
4585 * we inserted the route at the start of
4586 * our DAD process, so we don't need
4587 * to do it again
4588 */
4589 if (!(ifp->rt->rt6i_node))
4590 ip6_ins_rt(ifp->rt);
4591 if (ifp->idev->cnf.forwarding)
4592 addrconf_join_anycast(ifp);
4593 if (!ipv6_addr_any(&ifp->peer_addr))
4594 addrconf_prefix_route(&ifp->peer_addr, 128,
4595 ifp->idev->dev, 0, 0);
4596 break;
4597 case RTM_DELADDR:
4598 update_valid_ll_addr_cnt(ifp, -1);
4599
4600 if (ifp->idev->cnf.forwarding)
4601 addrconf_leave_anycast(ifp);
4602 addrconf_leave_solict(ifp->idev, &ifp->addr);
4603 if (!ipv6_addr_any(&ifp->peer_addr)) {
4604 struct rt6_info *rt;
4605 struct net_device *dev = ifp->idev->dev;
4606
4607 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4608 dev->ifindex, 1);
4609 if (rt) {
4610 dst_hold(&rt->dst);
4611 if (ip6_del_rt(rt))
4612 dst_free(&rt->dst);
4613 }
4614 }
4615 dst_hold(&ifp->rt->dst);
4616
4617 if (ip6_del_rt(ifp->rt))
4618 dst_free(&ifp->rt->dst);
4619 break;
4620 }
4621 atomic_inc(&net->ipv6.dev_addr_genid);
4622 rt_genid_bump_ipv6(net);
4623 }
4624
4625 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4626 {
4627 rcu_read_lock_bh();
4628 if (likely(ifp->idev->dead == 0))
4629 __ipv6_ifa_notify(event, ifp);
4630 rcu_read_unlock_bh();
4631 }
4632
4633 #ifdef CONFIG_SYSCTL
4634
4635 static
4636 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4637 void __user *buffer, size_t *lenp, loff_t *ppos)
4638 {
4639 int *valp = ctl->data;
4640 int val = *valp;
4641 loff_t pos = *ppos;
4642 struct ctl_table lctl;
4643 int ret;
4644
4645 /*
4646 * ctl->data points to idev->cnf.forwarding, we should
4647 * not modify it until we get the rtnl lock.
4648 */
4649 lctl = *ctl;
4650 lctl.data = &val;
4651
4652 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4653
4654 if (write)
4655 ret = addrconf_fixup_forwarding(ctl, valp, val);
4656 if (ret)
4657 *ppos = pos;
4658 return ret;
4659 }
4660
4661 static void dev_disable_change(struct inet6_dev *idev)
4662 {
4663 struct netdev_notifier_info info;
4664
4665 if (!idev || !idev->dev)
4666 return;
4667
4668 netdev_notifier_info_init(&info, idev->dev);
4669 if (idev->cnf.disable_ipv6)
4670 addrconf_notify(NULL, NETDEV_DOWN, &info);
4671 else
4672 addrconf_notify(NULL, NETDEV_UP, &info);
4673 }
4674
4675 static void addrconf_disable_change(struct net *net, __s32 newf)
4676 {
4677 struct net_device *dev;
4678 struct inet6_dev *idev;
4679
4680 rcu_read_lock();
4681 for_each_netdev_rcu(net, dev) {
4682 idev = __in6_dev_get(dev);
4683 if (idev) {
4684 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4685 idev->cnf.disable_ipv6 = newf;
4686 if (changed)
4687 dev_disable_change(idev);
4688 }
4689 }
4690 rcu_read_unlock();
4691 }
4692
4693 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4694 {
4695 struct net *net;
4696 int old;
4697
4698 if (!rtnl_trylock())
4699 return restart_syscall();
4700
4701 net = (struct net *)table->extra2;
4702 old = *p;
4703 *p = newf;
4704
4705 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4706 rtnl_unlock();
4707 return 0;
4708 }
4709
4710 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4711 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4712 addrconf_disable_change(net, newf);
4713 } else if ((!newf) ^ (!old))
4714 dev_disable_change((struct inet6_dev *)table->extra1);
4715
4716 rtnl_unlock();
4717 return 0;
4718 }
4719
4720 static
4721 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4722 void __user *buffer, size_t *lenp, loff_t *ppos)
4723 {
4724 int *valp = ctl->data;
4725 int val = *valp;
4726 loff_t pos = *ppos;
4727 struct ctl_table lctl;
4728 int ret;
4729
4730 /*
4731 * ctl->data points to idev->cnf.disable_ipv6, we should
4732 * not modify it until we get the rtnl lock.
4733 */
4734 lctl = *ctl;
4735 lctl.data = &val;
4736
4737 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4738
4739 if (write)
4740 ret = addrconf_disable_ipv6(ctl, valp, val);
4741 if (ret)
4742 *ppos = pos;
4743 return ret;
4744 }
4745
4746 static
4747 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
4748 void __user *buffer, size_t *lenp, loff_t *ppos)
4749 {
4750 int *valp = ctl->data;
4751 int ret;
4752 int old, new;
4753
4754 old = *valp;
4755 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4756 new = *valp;
4757
4758 if (write && old != new) {
4759 struct net *net = ctl->extra2;
4760
4761 if (!rtnl_trylock())
4762 return restart_syscall();
4763
4764 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
4765 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4766 NETCONFA_IFINDEX_DEFAULT,
4767 net->ipv6.devconf_dflt);
4768 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
4769 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4770 NETCONFA_IFINDEX_ALL,
4771 net->ipv6.devconf_all);
4772 else {
4773 struct inet6_dev *idev = ctl->extra1;
4774
4775 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4776 idev->dev->ifindex,
4777 &idev->cnf);
4778 }
4779 rtnl_unlock();
4780 }
4781
4782 return ret;
4783 }
4784
4785
4786 static struct addrconf_sysctl_table
4787 {
4788 struct ctl_table_header *sysctl_header;
4789 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4790 } addrconf_sysctl __read_mostly = {
4791 .sysctl_header = NULL,
4792 .addrconf_vars = {
4793 {
4794 .procname = "forwarding",
4795 .data = &ipv6_devconf.forwarding,
4796 .maxlen = sizeof(int),
4797 .mode = 0644,
4798 .proc_handler = addrconf_sysctl_forward,
4799 },
4800 {
4801 .procname = "hop_limit",
4802 .data = &ipv6_devconf.hop_limit,
4803 .maxlen = sizeof(int),
4804 .mode = 0644,
4805 .proc_handler = proc_dointvec,
4806 },
4807 {
4808 .procname = "mtu",
4809 .data = &ipv6_devconf.mtu6,
4810 .maxlen = sizeof(int),
4811 .mode = 0644,
4812 .proc_handler = proc_dointvec,
4813 },
4814 {
4815 .procname = "accept_ra",
4816 .data = &ipv6_devconf.accept_ra,
4817 .maxlen = sizeof(int),
4818 .mode = 0644,
4819 .proc_handler = proc_dointvec,
4820 },
4821 {
4822 .procname = "accept_redirects",
4823 .data = &ipv6_devconf.accept_redirects,
4824 .maxlen = sizeof(int),
4825 .mode = 0644,
4826 .proc_handler = proc_dointvec,
4827 },
4828 {
4829 .procname = "autoconf",
4830 .data = &ipv6_devconf.autoconf,
4831 .maxlen = sizeof(int),
4832 .mode = 0644,
4833 .proc_handler = proc_dointvec,
4834 },
4835 {
4836 .procname = "dad_transmits",
4837 .data = &ipv6_devconf.dad_transmits,
4838 .maxlen = sizeof(int),
4839 .mode = 0644,
4840 .proc_handler = proc_dointvec,
4841 },
4842 {
4843 .procname = "router_solicitations",
4844 .data = &ipv6_devconf.rtr_solicits,
4845 .maxlen = sizeof(int),
4846 .mode = 0644,
4847 .proc_handler = proc_dointvec,
4848 },
4849 {
4850 .procname = "router_solicitation_interval",
4851 .data = &ipv6_devconf.rtr_solicit_interval,
4852 .maxlen = sizeof(int),
4853 .mode = 0644,
4854 .proc_handler = proc_dointvec_jiffies,
4855 },
4856 {
4857 .procname = "router_solicitation_delay",
4858 .data = &ipv6_devconf.rtr_solicit_delay,
4859 .maxlen = sizeof(int),
4860 .mode = 0644,
4861 .proc_handler = proc_dointvec_jiffies,
4862 },
4863 {
4864 .procname = "force_mld_version",
4865 .data = &ipv6_devconf.force_mld_version,
4866 .maxlen = sizeof(int),
4867 .mode = 0644,
4868 .proc_handler = proc_dointvec,
4869 },
4870 {
4871 .procname = "mldv1_unsolicited_report_interval",
4872 .data =
4873 &ipv6_devconf.mldv1_unsolicited_report_interval,
4874 .maxlen = sizeof(int),
4875 .mode = 0644,
4876 .proc_handler = proc_dointvec_ms_jiffies,
4877 },
4878 {
4879 .procname = "mldv2_unsolicited_report_interval",
4880 .data =
4881 &ipv6_devconf.mldv2_unsolicited_report_interval,
4882 .maxlen = sizeof(int),
4883 .mode = 0644,
4884 .proc_handler = proc_dointvec_ms_jiffies,
4885 },
4886 {
4887 .procname = "use_tempaddr",
4888 .data = &ipv6_devconf.use_tempaddr,
4889 .maxlen = sizeof(int),
4890 .mode = 0644,
4891 .proc_handler = proc_dointvec,
4892 },
4893 {
4894 .procname = "temp_valid_lft",
4895 .data = &ipv6_devconf.temp_valid_lft,
4896 .maxlen = sizeof(int),
4897 .mode = 0644,
4898 .proc_handler = proc_dointvec,
4899 },
4900 {
4901 .procname = "temp_prefered_lft",
4902 .data = &ipv6_devconf.temp_prefered_lft,
4903 .maxlen = sizeof(int),
4904 .mode = 0644,
4905 .proc_handler = proc_dointvec,
4906 },
4907 {
4908 .procname = "regen_max_retry",
4909 .data = &ipv6_devconf.regen_max_retry,
4910 .maxlen = sizeof(int),
4911 .mode = 0644,
4912 .proc_handler = proc_dointvec,
4913 },
4914 {
4915 .procname = "max_desync_factor",
4916 .data = &ipv6_devconf.max_desync_factor,
4917 .maxlen = sizeof(int),
4918 .mode = 0644,
4919 .proc_handler = proc_dointvec,
4920 },
4921 {
4922 .procname = "max_addresses",
4923 .data = &ipv6_devconf.max_addresses,
4924 .maxlen = sizeof(int),
4925 .mode = 0644,
4926 .proc_handler = proc_dointvec,
4927 },
4928 {
4929 .procname = "accept_ra_defrtr",
4930 .data = &ipv6_devconf.accept_ra_defrtr,
4931 .maxlen = sizeof(int),
4932 .mode = 0644,
4933 .proc_handler = proc_dointvec,
4934 },
4935 {
4936 .procname = "accept_ra_pinfo",
4937 .data = &ipv6_devconf.accept_ra_pinfo,
4938 .maxlen = sizeof(int),
4939 .mode = 0644,
4940 .proc_handler = proc_dointvec,
4941 },
4942 #ifdef CONFIG_IPV6_ROUTER_PREF
4943 {
4944 .procname = "accept_ra_rtr_pref",
4945 .data = &ipv6_devconf.accept_ra_rtr_pref,
4946 .maxlen = sizeof(int),
4947 .mode = 0644,
4948 .proc_handler = proc_dointvec,
4949 },
4950 {
4951 .procname = "router_probe_interval",
4952 .data = &ipv6_devconf.rtr_probe_interval,
4953 .maxlen = sizeof(int),
4954 .mode = 0644,
4955 .proc_handler = proc_dointvec_jiffies,
4956 },
4957 #ifdef CONFIG_IPV6_ROUTE_INFO
4958 {
4959 .procname = "accept_ra_rt_info_max_plen",
4960 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4961 .maxlen = sizeof(int),
4962 .mode = 0644,
4963 .proc_handler = proc_dointvec,
4964 },
4965 #endif
4966 #endif
4967 {
4968 .procname = "proxy_ndp",
4969 .data = &ipv6_devconf.proxy_ndp,
4970 .maxlen = sizeof(int),
4971 .mode = 0644,
4972 .proc_handler = addrconf_sysctl_proxy_ndp,
4973 },
4974 {
4975 .procname = "accept_source_route",
4976 .data = &ipv6_devconf.accept_source_route,
4977 .maxlen = sizeof(int),
4978 .mode = 0644,
4979 .proc_handler = proc_dointvec,
4980 },
4981 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4982 {
4983 .procname = "optimistic_dad",
4984 .data = &ipv6_devconf.optimistic_dad,
4985 .maxlen = sizeof(int),
4986 .mode = 0644,
4987 .proc_handler = proc_dointvec,
4988
4989 },
4990 #endif
4991 #ifdef CONFIG_IPV6_MROUTE
4992 {
4993 .procname = "mc_forwarding",
4994 .data = &ipv6_devconf.mc_forwarding,
4995 .maxlen = sizeof(int),
4996 .mode = 0444,
4997 .proc_handler = proc_dointvec,
4998 },
4999 #endif
5000 {
5001 .procname = "disable_ipv6",
5002 .data = &ipv6_devconf.disable_ipv6,
5003 .maxlen = sizeof(int),
5004 .mode = 0644,
5005 .proc_handler = addrconf_sysctl_disable,
5006 },
5007 {
5008 .procname = "accept_dad",
5009 .data = &ipv6_devconf.accept_dad,
5010 .maxlen = sizeof(int),
5011 .mode = 0644,
5012 .proc_handler = proc_dointvec,
5013 },
5014 {
5015 .procname = "force_tllao",
5016 .data = &ipv6_devconf.force_tllao,
5017 .maxlen = sizeof(int),
5018 .mode = 0644,
5019 .proc_handler = proc_dointvec
5020 },
5021 {
5022 .procname = "ndisc_notify",
5023 .data = &ipv6_devconf.ndisc_notify,
5024 .maxlen = sizeof(int),
5025 .mode = 0644,
5026 .proc_handler = proc_dointvec
5027 },
5028 {
5029 .procname = "suppress_frag_ndisc",
5030 .data = &ipv6_devconf.suppress_frag_ndisc,
5031 .maxlen = sizeof(int),
5032 .mode = 0644,
5033 .proc_handler = proc_dointvec
5034 },
5035 {
5036 /* sentinel */
5037 }
5038 },
5039 };
5040
5041 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5042 struct inet6_dev *idev, struct ipv6_devconf *p)
5043 {
5044 int i;
5045 struct addrconf_sysctl_table *t;
5046 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5047
5048 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5049 if (t == NULL)
5050 goto out;
5051
5052 for (i = 0; t->addrconf_vars[i].data; i++) {
5053 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5054 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5055 t->addrconf_vars[i].extra2 = net;
5056 }
5057
5058 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5059
5060 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5061 if (t->sysctl_header == NULL)
5062 goto free;
5063
5064 p->sysctl = t;
5065 return 0;
5066
5067 free:
5068 kfree(t);
5069 out:
5070 return -ENOBUFS;
5071 }
5072
5073 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5074 {
5075 struct addrconf_sysctl_table *t;
5076
5077 if (p->sysctl == NULL)
5078 return;
5079
5080 t = p->sysctl;
5081 p->sysctl = NULL;
5082 unregister_net_sysctl_table(t->sysctl_header);
5083 kfree(t);
5084 }
5085
5086 static void addrconf_sysctl_register(struct inet6_dev *idev)
5087 {
5088 neigh_sysctl_register(idev->dev, idev->nd_parms,
5089 &ndisc_ifinfo_sysctl_change);
5090 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5091 idev, &idev->cnf);
5092 }
5093
5094 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5095 {
5096 __addrconf_sysctl_unregister(&idev->cnf);
5097 neigh_sysctl_unregister(idev->nd_parms);
5098 }
5099
5100
5101 #endif
5102
5103 static int __net_init addrconf_init_net(struct net *net)
5104 {
5105 int err = -ENOMEM;
5106 struct ipv6_devconf *all, *dflt;
5107
5108 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5109 if (all == NULL)
5110 goto err_alloc_all;
5111
5112 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5113 if (dflt == NULL)
5114 goto err_alloc_dflt;
5115
5116 /* these will be inherited by all namespaces */
5117 dflt->autoconf = ipv6_defaults.autoconf;
5118 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5119
5120 net->ipv6.devconf_all = all;
5121 net->ipv6.devconf_dflt = dflt;
5122
5123 #ifdef CONFIG_SYSCTL
5124 err = __addrconf_sysctl_register(net, "all", NULL, all);
5125 if (err < 0)
5126 goto err_reg_all;
5127
5128 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5129 if (err < 0)
5130 goto err_reg_dflt;
5131 #endif
5132 return 0;
5133
5134 #ifdef CONFIG_SYSCTL
5135 err_reg_dflt:
5136 __addrconf_sysctl_unregister(all);
5137 err_reg_all:
5138 kfree(dflt);
5139 #endif
5140 err_alloc_dflt:
5141 kfree(all);
5142 err_alloc_all:
5143 return err;
5144 }
5145
5146 static void __net_exit addrconf_exit_net(struct net *net)
5147 {
5148 #ifdef CONFIG_SYSCTL
5149 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5150 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5151 #endif
5152 if (!net_eq(net, &init_net)) {
5153 kfree(net->ipv6.devconf_dflt);
5154 kfree(net->ipv6.devconf_all);
5155 }
5156 }
5157
5158 static struct pernet_operations addrconf_ops = {
5159 .init = addrconf_init_net,
5160 .exit = addrconf_exit_net,
5161 };
5162
5163 static struct rtnl_af_ops inet6_ops = {
5164 .family = AF_INET6,
5165 .fill_link_af = inet6_fill_link_af,
5166 .get_link_af_size = inet6_get_link_af_size,
5167 .set_link_af = inet6_set_link_af,
5168 };
5169
5170 /*
5171 * Init / cleanup code
5172 */
5173
5174 int __init addrconf_init(void)
5175 {
5176 int i, err;
5177
5178 err = ipv6_addr_label_init();
5179 if (err < 0) {
5180 pr_crit("%s: cannot initialize default policy table: %d\n",
5181 __func__, err);
5182 goto out;
5183 }
5184
5185 err = register_pernet_subsys(&addrconf_ops);
5186 if (err < 0)
5187 goto out_addrlabel;
5188
5189 /* The addrconf netdev notifier requires that loopback_dev
5190 * has it's ipv6 private information allocated and setup
5191 * before it can bring up and give link-local addresses
5192 * to other devices which are up.
5193 *
5194 * Unfortunately, loopback_dev is not necessarily the first
5195 * entry in the global dev_base list of net devices. In fact,
5196 * it is likely to be the very last entry on that list.
5197 * So this causes the notifier registry below to try and
5198 * give link-local addresses to all devices besides loopback_dev
5199 * first, then loopback_dev, which cases all the non-loopback_dev
5200 * devices to fail to get a link-local address.
5201 *
5202 * So, as a temporary fix, allocate the ipv6 structure for
5203 * loopback_dev first by hand.
5204 * Longer term, all of the dependencies ipv6 has upon the loopback
5205 * device and it being up should be removed.
5206 */
5207 rtnl_lock();
5208 if (!ipv6_add_dev(init_net.loopback_dev))
5209 err = -ENOMEM;
5210 rtnl_unlock();
5211 if (err)
5212 goto errlo;
5213
5214 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5215 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5216
5217 register_netdevice_notifier(&ipv6_dev_notf);
5218
5219 addrconf_verify(0);
5220
5221 rtnl_af_register(&inet6_ops);
5222
5223 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5224 NULL);
5225 if (err < 0)
5226 goto errout;
5227
5228 /* Only the first call to __rtnl_register can fail */
5229 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5230 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5231 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5232 inet6_dump_ifaddr, NULL);
5233 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5234 inet6_dump_ifmcaddr, NULL);
5235 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5236 inet6_dump_ifacaddr, NULL);
5237 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5238 inet6_netconf_dump_devconf, NULL);
5239
5240 ipv6_addr_label_rtnl_register();
5241
5242 return 0;
5243 errout:
5244 rtnl_af_unregister(&inet6_ops);
5245 unregister_netdevice_notifier(&ipv6_dev_notf);
5246 errlo:
5247 unregister_pernet_subsys(&addrconf_ops);
5248 out_addrlabel:
5249 ipv6_addr_label_cleanup();
5250 out:
5251 return err;
5252 }
5253
5254 void addrconf_cleanup(void)
5255 {
5256 struct net_device *dev;
5257 int i;
5258
5259 unregister_netdevice_notifier(&ipv6_dev_notf);
5260 unregister_pernet_subsys(&addrconf_ops);
5261 ipv6_addr_label_cleanup();
5262
5263 rtnl_lock();
5264
5265 __rtnl_af_unregister(&inet6_ops);
5266
5267 /* clean dev list */
5268 for_each_netdev(&init_net, dev) {
5269 if (__in6_dev_get(dev) == NULL)
5270 continue;
5271 addrconf_ifdown(dev, 1);
5272 }
5273 addrconf_ifdown(init_net.loopback_dev, 2);
5274
5275 /*
5276 * Check hash table.
5277 */
5278 spin_lock_bh(&addrconf_hash_lock);
5279 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5280 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5281 spin_unlock_bh(&addrconf_hash_lock);
5282
5283 del_timer(&addr_chk_timer);
5284 rtnl_unlock();
5285 }
Ubuntu Jammy Linux kernel mirror