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Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/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 int addrconf_sysctl_register(struct inet6_dev *idev);
112 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
113 #else
114 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
115 {
116 return 0;
117 }
118
119 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
120 {
121 }
122 #endif
123
124 static void __ipv6_regen_rndid(struct inet6_dev *idev);
125 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
126 static void ipv6_regen_rndid(unsigned long data);
127
128 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
129 static int ipv6_count_addresses(struct inet6_dev *idev);
130
131 /*
132 * Configured unicast address hash table
133 */
134 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
135 static DEFINE_SPINLOCK(addrconf_hash_lock);
136
137 static void addrconf_verify(void);
138 static void addrconf_verify_rtnl(void);
139 static void addrconf_verify_work(struct work_struct *);
140
141 static struct workqueue_struct *addrconf_wq;
142 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
143
144 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
145 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
146
147 static void addrconf_type_change(struct net_device *dev,
148 unsigned long event);
149 static int addrconf_ifdown(struct net_device *dev, int how);
150
151 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
152 int plen,
153 const struct net_device *dev,
154 u32 flags, u32 noflags);
155
156 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
157 static void addrconf_dad_work(struct work_struct *w);
158 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
159 static void addrconf_dad_run(struct inet6_dev *idev);
160 static void addrconf_rs_timer(unsigned long data);
161 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
162 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
163
164 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
165 struct prefix_info *pinfo);
166 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
167 struct net_device *dev);
168
169 static struct ipv6_devconf ipv6_devconf __read_mostly = {
170 .forwarding = 0,
171 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
172 .mtu6 = IPV6_MIN_MTU,
173 .accept_ra = 1,
174 .accept_redirects = 1,
175 .autoconf = 1,
176 .force_mld_version = 0,
177 .mldv1_unsolicited_report_interval = 10 * HZ,
178 .mldv2_unsolicited_report_interval = HZ,
179 .dad_transmits = 1,
180 .rtr_solicits = MAX_RTR_SOLICITATIONS,
181 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
182 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
183 .use_tempaddr = 0,
184 .temp_valid_lft = TEMP_VALID_LIFETIME,
185 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
186 .regen_max_retry = REGEN_MAX_RETRY,
187 .max_desync_factor = MAX_DESYNC_FACTOR,
188 .max_addresses = IPV6_MAX_ADDRESSES,
189 .accept_ra_defrtr = 1,
190 .accept_ra_from_local = 0,
191 .accept_ra_pinfo = 1,
192 #ifdef CONFIG_IPV6_ROUTER_PREF
193 .accept_ra_rtr_pref = 1,
194 .rtr_probe_interval = 60 * HZ,
195 #ifdef CONFIG_IPV6_ROUTE_INFO
196 .accept_ra_rt_info_max_plen = 0,
197 #endif
198 #endif
199 .proxy_ndp = 0,
200 .accept_source_route = 0, /* we do not accept RH0 by default. */
201 .disable_ipv6 = 0,
202 .accept_dad = 1,
203 .suppress_frag_ndisc = 1,
204 };
205
206 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
207 .forwarding = 0,
208 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
209 .mtu6 = IPV6_MIN_MTU,
210 .accept_ra = 1,
211 .accept_redirects = 1,
212 .autoconf = 1,
213 .force_mld_version = 0,
214 .mldv1_unsolicited_report_interval = 10 * HZ,
215 .mldv2_unsolicited_report_interval = HZ,
216 .dad_transmits = 1,
217 .rtr_solicits = MAX_RTR_SOLICITATIONS,
218 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
219 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
220 .use_tempaddr = 0,
221 .temp_valid_lft = TEMP_VALID_LIFETIME,
222 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
223 .regen_max_retry = REGEN_MAX_RETRY,
224 .max_desync_factor = MAX_DESYNC_FACTOR,
225 .max_addresses = IPV6_MAX_ADDRESSES,
226 .accept_ra_defrtr = 1,
227 .accept_ra_from_local = 0,
228 .accept_ra_pinfo = 1,
229 #ifdef CONFIG_IPV6_ROUTER_PREF
230 .accept_ra_rtr_pref = 1,
231 .rtr_probe_interval = 60 * HZ,
232 #ifdef CONFIG_IPV6_ROUTE_INFO
233 .accept_ra_rt_info_max_plen = 0,
234 #endif
235 #endif
236 .proxy_ndp = 0,
237 .accept_source_route = 0, /* we do not accept RH0 by default. */
238 .disable_ipv6 = 0,
239 .accept_dad = 1,
240 .suppress_frag_ndisc = 1,
241 };
242
243 /* Check if a valid qdisc is available */
244 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
245 {
246 return !qdisc_tx_is_noop(dev);
247 }
248
249 static void addrconf_del_rs_timer(struct inet6_dev *idev)
250 {
251 if (del_timer(&idev->rs_timer))
252 __in6_dev_put(idev);
253 }
254
255 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
256 {
257 if (cancel_delayed_work(&ifp->dad_work))
258 __in6_ifa_put(ifp);
259 }
260
261 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
262 unsigned long when)
263 {
264 if (!timer_pending(&idev->rs_timer))
265 in6_dev_hold(idev);
266 mod_timer(&idev->rs_timer, jiffies + when);
267 }
268
269 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
270 unsigned long delay)
271 {
272 if (!delayed_work_pending(&ifp->dad_work))
273 in6_ifa_hold(ifp);
274 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
275 }
276
277 static int snmp6_alloc_dev(struct inet6_dev *idev)
278 {
279 int i;
280
281 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
282 if (!idev->stats.ipv6)
283 goto err_ip;
284
285 for_each_possible_cpu(i) {
286 struct ipstats_mib *addrconf_stats;
287 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
288 u64_stats_init(&addrconf_stats->syncp);
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 free_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 int err = -ENOMEM;
315
316 ASSERT_RTNL();
317
318 if (dev->mtu < IPV6_MIN_MTU)
319 return ERR_PTR(-EINVAL);
320
321 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322 if (ndev == NULL)
323 return ERR_PTR(err);
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 ERR_PTR(err);
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 ERR_PTR(err);
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 goto err_release;
358 }
359
360 /* One reference from device. We must do this before
361 * we invoke __ipv6_regen_rndid().
362 */
363 in6_dev_hold(ndev);
364
365 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
366 ndev->cnf.accept_dad = -1;
367
368 #if IS_ENABLED(CONFIG_IPV6_SIT)
369 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
370 pr_info("%s: Disabled Multicast RS\n", dev->name);
371 ndev->cnf.rtr_solicits = 0;
372 }
373 #endif
374
375 INIT_LIST_HEAD(&ndev->tempaddr_list);
376 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
377 if ((dev->flags&IFF_LOOPBACK) ||
378 dev->type == ARPHRD_TUNNEL ||
379 dev->type == ARPHRD_TUNNEL6 ||
380 dev->type == ARPHRD_SIT ||
381 dev->type == ARPHRD_NONE) {
382 ndev->cnf.use_tempaddr = -1;
383 } else {
384 in6_dev_hold(ndev);
385 ipv6_regen_rndid((unsigned long) ndev);
386 }
387
388 ndev->token = in6addr_any;
389
390 if (netif_running(dev) && addrconf_qdisc_ok(dev))
391 ndev->if_flags |= IF_READY;
392
393 ipv6_mc_init_dev(ndev);
394 ndev->tstamp = jiffies;
395 err = addrconf_sysctl_register(ndev);
396 if (err) {
397 ipv6_mc_destroy_dev(ndev);
398 del_timer(&ndev->regen_timer);
399 goto err_release;
400 }
401 /* protected by rtnl_lock */
402 rcu_assign_pointer(dev->ip6_ptr, ndev);
403
404 /* Join interface-local all-node multicast group */
405 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
406
407 /* Join all-node multicast group */
408 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
409
410 /* Join all-router multicast group if forwarding is set */
411 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
412 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
413
414 return ndev;
415
416 err_release:
417 neigh_parms_release(&nd_tbl, ndev->nd_parms);
418 ndev->dead = 1;
419 in6_dev_finish_destroy(ndev);
420 return ERR_PTR(err);
421 }
422
423 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
424 {
425 struct inet6_dev *idev;
426
427 ASSERT_RTNL();
428
429 idev = __in6_dev_get(dev);
430 if (!idev) {
431 idev = ipv6_add_dev(dev);
432 if (IS_ERR(idev))
433 return NULL;
434 }
435
436 if (dev->flags&IFF_UP)
437 ipv6_mc_up(idev);
438 return idev;
439 }
440
441 static int inet6_netconf_msgsize_devconf(int type)
442 {
443 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
444 + nla_total_size(4); /* NETCONFA_IFINDEX */
445
446 /* type -1 is used for ALL */
447 if (type == -1 || type == NETCONFA_FORWARDING)
448 size += nla_total_size(4);
449 #ifdef CONFIG_IPV6_MROUTE
450 if (type == -1 || type == NETCONFA_MC_FORWARDING)
451 size += nla_total_size(4);
452 #endif
453 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
454 size += nla_total_size(4);
455
456 return size;
457 }
458
459 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
460 struct ipv6_devconf *devconf, u32 portid,
461 u32 seq, int event, unsigned int flags,
462 int type)
463 {
464 struct nlmsghdr *nlh;
465 struct netconfmsg *ncm;
466
467 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
468 flags);
469 if (nlh == NULL)
470 return -EMSGSIZE;
471
472 ncm = nlmsg_data(nlh);
473 ncm->ncm_family = AF_INET6;
474
475 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
476 goto nla_put_failure;
477
478 /* type -1 is used for ALL */
479 if ((type == -1 || type == NETCONFA_FORWARDING) &&
480 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
481 goto nla_put_failure;
482 #ifdef CONFIG_IPV6_MROUTE
483 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
484 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
485 devconf->mc_forwarding) < 0)
486 goto nla_put_failure;
487 #endif
488 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
489 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
490 goto nla_put_failure;
491
492 return nlmsg_end(skb, nlh);
493
494 nla_put_failure:
495 nlmsg_cancel(skb, nlh);
496 return -EMSGSIZE;
497 }
498
499 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
500 struct ipv6_devconf *devconf)
501 {
502 struct sk_buff *skb;
503 int err = -ENOBUFS;
504
505 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
506 if (skb == NULL)
507 goto errout;
508
509 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
510 RTM_NEWNETCONF, 0, type);
511 if (err < 0) {
512 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
513 WARN_ON(err == -EMSGSIZE);
514 kfree_skb(skb);
515 goto errout;
516 }
517 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
518 return;
519 errout:
520 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
521 }
522
523 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
524 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
525 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
526 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
527 };
528
529 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
530 struct nlmsghdr *nlh)
531 {
532 struct net *net = sock_net(in_skb->sk);
533 struct nlattr *tb[NETCONFA_MAX+1];
534 struct netconfmsg *ncm;
535 struct sk_buff *skb;
536 struct ipv6_devconf *devconf;
537 struct inet6_dev *in6_dev;
538 struct net_device *dev;
539 int ifindex;
540 int err;
541
542 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
543 devconf_ipv6_policy);
544 if (err < 0)
545 goto errout;
546
547 err = EINVAL;
548 if (!tb[NETCONFA_IFINDEX])
549 goto errout;
550
551 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
552 switch (ifindex) {
553 case NETCONFA_IFINDEX_ALL:
554 devconf = net->ipv6.devconf_all;
555 break;
556 case NETCONFA_IFINDEX_DEFAULT:
557 devconf = net->ipv6.devconf_dflt;
558 break;
559 default:
560 dev = __dev_get_by_index(net, ifindex);
561 if (dev == NULL)
562 goto errout;
563 in6_dev = __in6_dev_get(dev);
564 if (in6_dev == NULL)
565 goto errout;
566 devconf = &in6_dev->cnf;
567 break;
568 }
569
570 err = -ENOBUFS;
571 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
572 if (skb == NULL)
573 goto errout;
574
575 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
576 NETLINK_CB(in_skb).portid,
577 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
578 -1);
579 if (err < 0) {
580 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
581 WARN_ON(err == -EMSGSIZE);
582 kfree_skb(skb);
583 goto errout;
584 }
585 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
586 errout:
587 return err;
588 }
589
590 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
591 struct netlink_callback *cb)
592 {
593 struct net *net = sock_net(skb->sk);
594 int h, s_h;
595 int idx, s_idx;
596 struct net_device *dev;
597 struct inet6_dev *idev;
598 struct hlist_head *head;
599
600 s_h = cb->args[0];
601 s_idx = idx = cb->args[1];
602
603 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
604 idx = 0;
605 head = &net->dev_index_head[h];
606 rcu_read_lock();
607 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
608 net->dev_base_seq;
609 hlist_for_each_entry_rcu(dev, head, index_hlist) {
610 if (idx < s_idx)
611 goto cont;
612 idev = __in6_dev_get(dev);
613 if (!idev)
614 goto cont;
615
616 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
617 &idev->cnf,
618 NETLINK_CB(cb->skb).portid,
619 cb->nlh->nlmsg_seq,
620 RTM_NEWNETCONF,
621 NLM_F_MULTI,
622 -1) <= 0) {
623 rcu_read_unlock();
624 goto done;
625 }
626 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
627 cont:
628 idx++;
629 }
630 rcu_read_unlock();
631 }
632 if (h == NETDEV_HASHENTRIES) {
633 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
634 net->ipv6.devconf_all,
635 NETLINK_CB(cb->skb).portid,
636 cb->nlh->nlmsg_seq,
637 RTM_NEWNETCONF, NLM_F_MULTI,
638 -1) <= 0)
639 goto done;
640 else
641 h++;
642 }
643 if (h == NETDEV_HASHENTRIES + 1) {
644 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
645 net->ipv6.devconf_dflt,
646 NETLINK_CB(cb->skb).portid,
647 cb->nlh->nlmsg_seq,
648 RTM_NEWNETCONF, NLM_F_MULTI,
649 -1) <= 0)
650 goto done;
651 else
652 h++;
653 }
654 done:
655 cb->args[0] = h;
656 cb->args[1] = idx;
657
658 return skb->len;
659 }
660
661 #ifdef CONFIG_SYSCTL
662 static void dev_forward_change(struct inet6_dev *idev)
663 {
664 struct net_device *dev;
665 struct inet6_ifaddr *ifa;
666
667 if (!idev)
668 return;
669 dev = idev->dev;
670 if (idev->cnf.forwarding)
671 dev_disable_lro(dev);
672 if (dev->flags & IFF_MULTICAST) {
673 if (idev->cnf.forwarding) {
674 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
675 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
676 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
677 } else {
678 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
679 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
680 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
681 }
682 }
683
684 list_for_each_entry(ifa, &idev->addr_list, if_list) {
685 if (ifa->flags&IFA_F_TENTATIVE)
686 continue;
687 if (idev->cnf.forwarding)
688 addrconf_join_anycast(ifa);
689 else
690 addrconf_leave_anycast(ifa);
691 }
692 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
693 dev->ifindex, &idev->cnf);
694 }
695
696
697 static void addrconf_forward_change(struct net *net, __s32 newf)
698 {
699 struct net_device *dev;
700 struct inet6_dev *idev;
701
702 for_each_netdev(net, dev) {
703 idev = __in6_dev_get(dev);
704 if (idev) {
705 int changed = (!idev->cnf.forwarding) ^ (!newf);
706 idev->cnf.forwarding = newf;
707 if (changed)
708 dev_forward_change(idev);
709 }
710 }
711 }
712
713 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
714 {
715 struct net *net;
716 int old;
717
718 if (!rtnl_trylock())
719 return restart_syscall();
720
721 net = (struct net *)table->extra2;
722 old = *p;
723 *p = newf;
724
725 if (p == &net->ipv6.devconf_dflt->forwarding) {
726 if ((!newf) ^ (!old))
727 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
728 NETCONFA_IFINDEX_DEFAULT,
729 net->ipv6.devconf_dflt);
730 rtnl_unlock();
731 return 0;
732 }
733
734 if (p == &net->ipv6.devconf_all->forwarding) {
735 net->ipv6.devconf_dflt->forwarding = newf;
736 addrconf_forward_change(net, newf);
737 if ((!newf) ^ (!old))
738 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
739 NETCONFA_IFINDEX_ALL,
740 net->ipv6.devconf_all);
741 } else if ((!newf) ^ (!old))
742 dev_forward_change((struct inet6_dev *)table->extra1);
743 rtnl_unlock();
744
745 if (newf)
746 rt6_purge_dflt_routers(net);
747 return 1;
748 }
749 #endif
750
751 /* Nobody refers to this ifaddr, destroy it */
752 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
753 {
754 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
755
756 #ifdef NET_REFCNT_DEBUG
757 pr_debug("%s\n", __func__);
758 #endif
759
760 in6_dev_put(ifp->idev);
761
762 if (cancel_delayed_work(&ifp->dad_work))
763 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
764 ifp);
765
766 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
767 pr_warn("Freeing alive inet6 address %p\n", ifp);
768 return;
769 }
770 ip6_rt_put(ifp->rt);
771
772 kfree_rcu(ifp, rcu);
773 }
774
775 static void
776 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
777 {
778 struct list_head *p;
779 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
780
781 /*
782 * Each device address list is sorted in order of scope -
783 * global before linklocal.
784 */
785 list_for_each(p, &idev->addr_list) {
786 struct inet6_ifaddr *ifa
787 = list_entry(p, struct inet6_ifaddr, if_list);
788 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
789 break;
790 }
791
792 list_add_tail(&ifp->if_list, p);
793 }
794
795 static u32 inet6_addr_hash(const struct in6_addr *addr)
796 {
797 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
798 }
799
800 /* On success it returns ifp with increased reference count */
801
802 static struct inet6_ifaddr *
803 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
804 const struct in6_addr *peer_addr, int pfxlen,
805 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
806 {
807 struct inet6_ifaddr *ifa = NULL;
808 struct rt6_info *rt;
809 unsigned int hash;
810 int err = 0;
811 int addr_type = ipv6_addr_type(addr);
812
813 if (addr_type == IPV6_ADDR_ANY ||
814 addr_type & IPV6_ADDR_MULTICAST ||
815 (!(idev->dev->flags & IFF_LOOPBACK) &&
816 addr_type & IPV6_ADDR_LOOPBACK))
817 return ERR_PTR(-EADDRNOTAVAIL);
818
819 rcu_read_lock_bh();
820 if (idev->dead) {
821 err = -ENODEV; /*XXX*/
822 goto out2;
823 }
824
825 if (idev->cnf.disable_ipv6) {
826 err = -EACCES;
827 goto out2;
828 }
829
830 spin_lock(&addrconf_hash_lock);
831
832 /* Ignore adding duplicate addresses on an interface */
833 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
834 ADBG("ipv6_add_addr: already assigned\n");
835 err = -EEXIST;
836 goto out;
837 }
838
839 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
840
841 if (ifa == NULL) {
842 ADBG("ipv6_add_addr: malloc failed\n");
843 err = -ENOBUFS;
844 goto out;
845 }
846
847 rt = addrconf_dst_alloc(idev, addr, false);
848 if (IS_ERR(rt)) {
849 err = PTR_ERR(rt);
850 goto out;
851 }
852
853 neigh_parms_data_state_setall(idev->nd_parms);
854
855 ifa->addr = *addr;
856 if (peer_addr)
857 ifa->peer_addr = *peer_addr;
858
859 spin_lock_init(&ifa->lock);
860 spin_lock_init(&ifa->state_lock);
861 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
862 INIT_HLIST_NODE(&ifa->addr_lst);
863 ifa->scope = scope;
864 ifa->prefix_len = pfxlen;
865 ifa->flags = flags | IFA_F_TENTATIVE;
866 ifa->valid_lft = valid_lft;
867 ifa->prefered_lft = prefered_lft;
868 ifa->cstamp = ifa->tstamp = jiffies;
869 ifa->tokenized = false;
870
871 ifa->rt = rt;
872
873 ifa->idev = idev;
874 in6_dev_hold(idev);
875 /* For caller */
876 in6_ifa_hold(ifa);
877
878 /* Add to big hash table */
879 hash = inet6_addr_hash(addr);
880
881 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
882 spin_unlock(&addrconf_hash_lock);
883
884 write_lock(&idev->lock);
885 /* Add to inet6_dev unicast addr list. */
886 ipv6_link_dev_addr(idev, ifa);
887
888 if (ifa->flags&IFA_F_TEMPORARY) {
889 list_add(&ifa->tmp_list, &idev->tempaddr_list);
890 in6_ifa_hold(ifa);
891 }
892
893 in6_ifa_hold(ifa);
894 write_unlock(&idev->lock);
895 out2:
896 rcu_read_unlock_bh();
897
898 if (likely(err == 0))
899 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
900 else {
901 kfree(ifa);
902 ifa = ERR_PTR(err);
903 }
904
905 return ifa;
906 out:
907 spin_unlock(&addrconf_hash_lock);
908 goto out2;
909 }
910
911 enum cleanup_prefix_rt_t {
912 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
913 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
914 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
915 };
916
917 /*
918 * Check, whether the prefix for ifp would still need a prefix route
919 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
920 * constants.
921 *
922 * 1) we don't purge prefix if address was not permanent.
923 * prefix is managed by its own lifetime.
924 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
925 * 3) if there are no addresses, delete prefix.
926 * 4) if there are still other permanent address(es),
927 * corresponding prefix is still permanent.
928 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
929 * don't purge the prefix, assume user space is managing it.
930 * 6) otherwise, update prefix lifetime to the
931 * longest valid lifetime among the corresponding
932 * addresses on the device.
933 * Note: subsequent RA will update lifetime.
934 **/
935 static enum cleanup_prefix_rt_t
936 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
937 {
938 struct inet6_ifaddr *ifa;
939 struct inet6_dev *idev = ifp->idev;
940 unsigned long lifetime;
941 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
942
943 *expires = jiffies;
944
945 list_for_each_entry(ifa, &idev->addr_list, if_list) {
946 if (ifa == ifp)
947 continue;
948 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
949 ifp->prefix_len))
950 continue;
951 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
952 return CLEANUP_PREFIX_RT_NOP;
953
954 action = CLEANUP_PREFIX_RT_EXPIRE;
955
956 spin_lock(&ifa->lock);
957
958 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
959 /*
960 * Note: Because this address is
961 * not permanent, lifetime <
962 * LONG_MAX / HZ here.
963 */
964 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
965 *expires = ifa->tstamp + lifetime * HZ;
966 spin_unlock(&ifa->lock);
967 }
968
969 return action;
970 }
971
972 static void
973 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
974 {
975 struct rt6_info *rt;
976
977 rt = addrconf_get_prefix_route(&ifp->addr,
978 ifp->prefix_len,
979 ifp->idev->dev,
980 0, RTF_GATEWAY | RTF_DEFAULT);
981 if (rt) {
982 if (del_rt)
983 ip6_del_rt(rt);
984 else {
985 if (!(rt->rt6i_flags & RTF_EXPIRES))
986 rt6_set_expires(rt, expires);
987 ip6_rt_put(rt);
988 }
989 }
990 }
991
992
993 /* This function wants to get referenced ifp and releases it before return */
994
995 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
996 {
997 int state;
998 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
999 unsigned long expires;
1000
1001 ASSERT_RTNL();
1002
1003 spin_lock_bh(&ifp->state_lock);
1004 state = ifp->state;
1005 ifp->state = INET6_IFADDR_STATE_DEAD;
1006 spin_unlock_bh(&ifp->state_lock);
1007
1008 if (state == INET6_IFADDR_STATE_DEAD)
1009 goto out;
1010
1011 spin_lock_bh(&addrconf_hash_lock);
1012 hlist_del_init_rcu(&ifp->addr_lst);
1013 spin_unlock_bh(&addrconf_hash_lock);
1014
1015 write_lock_bh(&ifp->idev->lock);
1016
1017 if (ifp->flags&IFA_F_TEMPORARY) {
1018 list_del(&ifp->tmp_list);
1019 if (ifp->ifpub) {
1020 in6_ifa_put(ifp->ifpub);
1021 ifp->ifpub = NULL;
1022 }
1023 __in6_ifa_put(ifp);
1024 }
1025
1026 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1027 action = check_cleanup_prefix_route(ifp, &expires);
1028
1029 list_del_init(&ifp->if_list);
1030 __in6_ifa_put(ifp);
1031
1032 write_unlock_bh(&ifp->idev->lock);
1033
1034 addrconf_del_dad_work(ifp);
1035
1036 ipv6_ifa_notify(RTM_DELADDR, ifp);
1037
1038 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1039
1040 if (action != CLEANUP_PREFIX_RT_NOP) {
1041 cleanup_prefix_route(ifp, expires,
1042 action == CLEANUP_PREFIX_RT_DEL);
1043 }
1044
1045 /* clean up prefsrc entries */
1046 rt6_remove_prefsrc(ifp);
1047 out:
1048 in6_ifa_put(ifp);
1049 }
1050
1051 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1052 {
1053 struct inet6_dev *idev = ifp->idev;
1054 struct in6_addr addr, *tmpaddr;
1055 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1056 unsigned long regen_advance;
1057 int tmp_plen;
1058 int ret = 0;
1059 u32 addr_flags;
1060 unsigned long now = jiffies;
1061
1062 write_lock_bh(&idev->lock);
1063 if (ift) {
1064 spin_lock_bh(&ift->lock);
1065 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1066 spin_unlock_bh(&ift->lock);
1067 tmpaddr = &addr;
1068 } else {
1069 tmpaddr = NULL;
1070 }
1071 retry:
1072 in6_dev_hold(idev);
1073 if (idev->cnf.use_tempaddr <= 0) {
1074 write_unlock_bh(&idev->lock);
1075 pr_info("%s: use_tempaddr is disabled\n", __func__);
1076 in6_dev_put(idev);
1077 ret = -1;
1078 goto out;
1079 }
1080 spin_lock_bh(&ifp->lock);
1081 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1082 idev->cnf.use_tempaddr = -1; /*XXX*/
1083 spin_unlock_bh(&ifp->lock);
1084 write_unlock_bh(&idev->lock);
1085 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1086 __func__);
1087 in6_dev_put(idev);
1088 ret = -1;
1089 goto out;
1090 }
1091 in6_ifa_hold(ifp);
1092 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1093 __ipv6_try_regen_rndid(idev, tmpaddr);
1094 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1095 age = (now - ifp->tstamp) / HZ;
1096 tmp_valid_lft = min_t(__u32,
1097 ifp->valid_lft,
1098 idev->cnf.temp_valid_lft + age);
1099 tmp_prefered_lft = min_t(__u32,
1100 ifp->prefered_lft,
1101 idev->cnf.temp_prefered_lft + age -
1102 idev->cnf.max_desync_factor);
1103 tmp_plen = ifp->prefix_len;
1104 tmp_tstamp = ifp->tstamp;
1105 spin_unlock_bh(&ifp->lock);
1106
1107 regen_advance = idev->cnf.regen_max_retry *
1108 idev->cnf.dad_transmits *
1109 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1110 write_unlock_bh(&idev->lock);
1111
1112 /* A temporary address is created only if this calculated Preferred
1113 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1114 * an implementation must not create a temporary address with a zero
1115 * Preferred Lifetime.
1116 * Use age calculation as in addrconf_verify to avoid unnecessary
1117 * temporary addresses being generated.
1118 */
1119 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1120 if (tmp_prefered_lft <= regen_advance + age) {
1121 in6_ifa_put(ifp);
1122 in6_dev_put(idev);
1123 ret = -1;
1124 goto out;
1125 }
1126
1127 addr_flags = IFA_F_TEMPORARY;
1128 /* set in addrconf_prefix_rcv() */
1129 if (ifp->flags & IFA_F_OPTIMISTIC)
1130 addr_flags |= IFA_F_OPTIMISTIC;
1131
1132 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1133 ipv6_addr_scope(&addr), addr_flags,
1134 tmp_valid_lft, tmp_prefered_lft);
1135 if (IS_ERR(ift)) {
1136 in6_ifa_put(ifp);
1137 in6_dev_put(idev);
1138 pr_info("%s: retry temporary address regeneration\n", __func__);
1139 tmpaddr = &addr;
1140 write_lock_bh(&idev->lock);
1141 goto retry;
1142 }
1143
1144 spin_lock_bh(&ift->lock);
1145 ift->ifpub = ifp;
1146 ift->cstamp = now;
1147 ift->tstamp = tmp_tstamp;
1148 spin_unlock_bh(&ift->lock);
1149
1150 addrconf_dad_start(ift);
1151 in6_ifa_put(ift);
1152 in6_dev_put(idev);
1153 out:
1154 return ret;
1155 }
1156
1157 /*
1158 * Choose an appropriate source address (RFC3484)
1159 */
1160 enum {
1161 IPV6_SADDR_RULE_INIT = 0,
1162 IPV6_SADDR_RULE_LOCAL,
1163 IPV6_SADDR_RULE_SCOPE,
1164 IPV6_SADDR_RULE_PREFERRED,
1165 #ifdef CONFIG_IPV6_MIP6
1166 IPV6_SADDR_RULE_HOA,
1167 #endif
1168 IPV6_SADDR_RULE_OIF,
1169 IPV6_SADDR_RULE_LABEL,
1170 IPV6_SADDR_RULE_PRIVACY,
1171 IPV6_SADDR_RULE_ORCHID,
1172 IPV6_SADDR_RULE_PREFIX,
1173 IPV6_SADDR_RULE_MAX
1174 };
1175
1176 struct ipv6_saddr_score {
1177 int rule;
1178 int addr_type;
1179 struct inet6_ifaddr *ifa;
1180 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1181 int scopedist;
1182 int matchlen;
1183 };
1184
1185 struct ipv6_saddr_dst {
1186 const struct in6_addr *addr;
1187 int ifindex;
1188 int scope;
1189 int label;
1190 unsigned int prefs;
1191 };
1192
1193 static inline int ipv6_saddr_preferred(int type)
1194 {
1195 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1196 return 1;
1197 return 0;
1198 }
1199
1200 static int ipv6_get_saddr_eval(struct net *net,
1201 struct ipv6_saddr_score *score,
1202 struct ipv6_saddr_dst *dst,
1203 int i)
1204 {
1205 int ret;
1206
1207 if (i <= score->rule) {
1208 switch (i) {
1209 case IPV6_SADDR_RULE_SCOPE:
1210 ret = score->scopedist;
1211 break;
1212 case IPV6_SADDR_RULE_PREFIX:
1213 ret = score->matchlen;
1214 break;
1215 default:
1216 ret = !!test_bit(i, score->scorebits);
1217 }
1218 goto out;
1219 }
1220
1221 switch (i) {
1222 case IPV6_SADDR_RULE_INIT:
1223 /* Rule 0: remember if hiscore is not ready yet */
1224 ret = !!score->ifa;
1225 break;
1226 case IPV6_SADDR_RULE_LOCAL:
1227 /* Rule 1: Prefer same address */
1228 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1229 break;
1230 case IPV6_SADDR_RULE_SCOPE:
1231 /* Rule 2: Prefer appropriate scope
1232 *
1233 * ret
1234 * ^
1235 * -1 | d 15
1236 * ---+--+-+---> scope
1237 * |
1238 * | d is scope of the destination.
1239 * B-d | \
1240 * | \ <- smaller scope is better if
1241 * B-15 | \ if scope is enough for destination.
1242 * | ret = B - scope (-1 <= scope >= d <= 15).
1243 * d-C-1 | /
1244 * |/ <- greater is better
1245 * -C / if scope is not enough for destination.
1246 * /| ret = scope - C (-1 <= d < scope <= 15).
1247 *
1248 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1249 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1250 * Assume B = 0 and we get C > 29.
1251 */
1252 ret = __ipv6_addr_src_scope(score->addr_type);
1253 if (ret >= dst->scope)
1254 ret = -ret;
1255 else
1256 ret -= 128; /* 30 is enough */
1257 score->scopedist = ret;
1258 break;
1259 case IPV6_SADDR_RULE_PREFERRED:
1260 /* Rule 3: Avoid deprecated and optimistic addresses */
1261 ret = ipv6_saddr_preferred(score->addr_type) ||
1262 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1263 break;
1264 #ifdef CONFIG_IPV6_MIP6
1265 case IPV6_SADDR_RULE_HOA:
1266 {
1267 /* Rule 4: Prefer home address */
1268 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1269 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1270 break;
1271 }
1272 #endif
1273 case IPV6_SADDR_RULE_OIF:
1274 /* Rule 5: Prefer outgoing interface */
1275 ret = (!dst->ifindex ||
1276 dst->ifindex == score->ifa->idev->dev->ifindex);
1277 break;
1278 case IPV6_SADDR_RULE_LABEL:
1279 /* Rule 6: Prefer matching label */
1280 ret = ipv6_addr_label(net,
1281 &score->ifa->addr, score->addr_type,
1282 score->ifa->idev->dev->ifindex) == dst->label;
1283 break;
1284 case IPV6_SADDR_RULE_PRIVACY:
1285 {
1286 /* Rule 7: Prefer public address
1287 * Note: prefer temporary address if use_tempaddr >= 2
1288 */
1289 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1290 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1291 score->ifa->idev->cnf.use_tempaddr >= 2;
1292 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1293 break;
1294 }
1295 case IPV6_SADDR_RULE_ORCHID:
1296 /* Rule 8-: Prefer ORCHID vs ORCHID or
1297 * non-ORCHID vs non-ORCHID
1298 */
1299 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1300 ipv6_addr_orchid(dst->addr));
1301 break;
1302 case IPV6_SADDR_RULE_PREFIX:
1303 /* Rule 8: Use longest matching prefix */
1304 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1305 if (ret > score->ifa->prefix_len)
1306 ret = score->ifa->prefix_len;
1307 score->matchlen = ret;
1308 break;
1309 default:
1310 ret = 0;
1311 }
1312
1313 if (ret)
1314 __set_bit(i, score->scorebits);
1315 score->rule = i;
1316 out:
1317 return ret;
1318 }
1319
1320 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1321 const struct in6_addr *daddr, unsigned int prefs,
1322 struct in6_addr *saddr)
1323 {
1324 struct ipv6_saddr_score scores[2],
1325 *score = &scores[0], *hiscore = &scores[1];
1326 struct ipv6_saddr_dst dst;
1327 struct net_device *dev;
1328 int dst_type;
1329
1330 dst_type = __ipv6_addr_type(daddr);
1331 dst.addr = daddr;
1332 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1333 dst.scope = __ipv6_addr_src_scope(dst_type);
1334 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1335 dst.prefs = prefs;
1336
1337 hiscore->rule = -1;
1338 hiscore->ifa = NULL;
1339
1340 rcu_read_lock();
1341
1342 for_each_netdev_rcu(net, dev) {
1343 struct inet6_dev *idev;
1344
1345 /* Candidate Source Address (section 4)
1346 * - multicast and link-local destination address,
1347 * the set of candidate source address MUST only
1348 * include addresses assigned to interfaces
1349 * belonging to the same link as the outgoing
1350 * interface.
1351 * (- For site-local destination addresses, the
1352 * set of candidate source addresses MUST only
1353 * include addresses assigned to interfaces
1354 * belonging to the same site as the outgoing
1355 * interface.)
1356 */
1357 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1358 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1359 dst.ifindex && dev->ifindex != dst.ifindex)
1360 continue;
1361
1362 idev = __in6_dev_get(dev);
1363 if (!idev)
1364 continue;
1365
1366 read_lock_bh(&idev->lock);
1367 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1368 int i;
1369
1370 /*
1371 * - Tentative Address (RFC2462 section 5.4)
1372 * - A tentative address is not considered
1373 * "assigned to an interface" in the traditional
1374 * sense, unless it is also flagged as optimistic.
1375 * - Candidate Source Address (section 4)
1376 * - In any case, anycast addresses, multicast
1377 * addresses, and the unspecified address MUST
1378 * NOT be included in a candidate set.
1379 */
1380 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1381 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1382 continue;
1383
1384 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1385
1386 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1387 score->addr_type & IPV6_ADDR_MULTICAST)) {
1388 LIMIT_NETDEBUG(KERN_DEBUG
1389 "ADDRCONF: unspecified / multicast address "
1390 "assigned as unicast address on %s",
1391 dev->name);
1392 continue;
1393 }
1394
1395 score->rule = -1;
1396 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1397
1398 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1399 int minihiscore, miniscore;
1400
1401 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1402 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1403
1404 if (minihiscore > miniscore) {
1405 if (i == IPV6_SADDR_RULE_SCOPE &&
1406 score->scopedist > 0) {
1407 /*
1408 * special case:
1409 * each remaining entry
1410 * has too small (not enough)
1411 * scope, because ifa entries
1412 * are sorted by their scope
1413 * values.
1414 */
1415 goto try_nextdev;
1416 }
1417 break;
1418 } else if (minihiscore < miniscore) {
1419 if (hiscore->ifa)
1420 in6_ifa_put(hiscore->ifa);
1421
1422 in6_ifa_hold(score->ifa);
1423
1424 swap(hiscore, score);
1425
1426 /* restore our iterator */
1427 score->ifa = hiscore->ifa;
1428
1429 break;
1430 }
1431 }
1432 }
1433 try_nextdev:
1434 read_unlock_bh(&idev->lock);
1435 }
1436 rcu_read_unlock();
1437
1438 if (!hiscore->ifa)
1439 return -EADDRNOTAVAIL;
1440
1441 *saddr = hiscore->ifa->addr;
1442 in6_ifa_put(hiscore->ifa);
1443 return 0;
1444 }
1445 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1446
1447 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1448 u32 banned_flags)
1449 {
1450 struct inet6_ifaddr *ifp;
1451 int err = -EADDRNOTAVAIL;
1452
1453 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1454 if (ifp->scope > IFA_LINK)
1455 break;
1456 if (ifp->scope == IFA_LINK &&
1457 !(ifp->flags & banned_flags)) {
1458 *addr = ifp->addr;
1459 err = 0;
1460 break;
1461 }
1462 }
1463 return err;
1464 }
1465
1466 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1467 u32 banned_flags)
1468 {
1469 struct inet6_dev *idev;
1470 int err = -EADDRNOTAVAIL;
1471
1472 rcu_read_lock();
1473 idev = __in6_dev_get(dev);
1474 if (idev) {
1475 read_lock_bh(&idev->lock);
1476 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1477 read_unlock_bh(&idev->lock);
1478 }
1479 rcu_read_unlock();
1480 return err;
1481 }
1482
1483 static int ipv6_count_addresses(struct inet6_dev *idev)
1484 {
1485 int cnt = 0;
1486 struct inet6_ifaddr *ifp;
1487
1488 read_lock_bh(&idev->lock);
1489 list_for_each_entry(ifp, &idev->addr_list, if_list)
1490 cnt++;
1491 read_unlock_bh(&idev->lock);
1492 return cnt;
1493 }
1494
1495 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1496 const struct net_device *dev, int strict)
1497 {
1498 struct inet6_ifaddr *ifp;
1499 unsigned int hash = inet6_addr_hash(addr);
1500
1501 rcu_read_lock_bh();
1502 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1503 if (!net_eq(dev_net(ifp->idev->dev), net))
1504 continue;
1505 if (ipv6_addr_equal(&ifp->addr, addr) &&
1506 !(ifp->flags&IFA_F_TENTATIVE) &&
1507 (dev == NULL || ifp->idev->dev == dev ||
1508 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1509 rcu_read_unlock_bh();
1510 return 1;
1511 }
1512 }
1513
1514 rcu_read_unlock_bh();
1515 return 0;
1516 }
1517 EXPORT_SYMBOL(ipv6_chk_addr);
1518
1519 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1520 struct net_device *dev)
1521 {
1522 unsigned int hash = inet6_addr_hash(addr);
1523 struct inet6_ifaddr *ifp;
1524
1525 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1526 if (!net_eq(dev_net(ifp->idev->dev), net))
1527 continue;
1528 if (ipv6_addr_equal(&ifp->addr, addr)) {
1529 if (dev == NULL || ifp->idev->dev == dev)
1530 return true;
1531 }
1532 }
1533 return false;
1534 }
1535
1536 /* Compares an address/prefix_len with addresses on device @dev.
1537 * If one is found it returns true.
1538 */
1539 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1540 const unsigned int prefix_len, struct net_device *dev)
1541 {
1542 struct inet6_dev *idev;
1543 struct inet6_ifaddr *ifa;
1544 bool ret = false;
1545
1546 rcu_read_lock();
1547 idev = __in6_dev_get(dev);
1548 if (idev) {
1549 read_lock_bh(&idev->lock);
1550 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1551 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1552 if (ret)
1553 break;
1554 }
1555 read_unlock_bh(&idev->lock);
1556 }
1557 rcu_read_unlock();
1558
1559 return ret;
1560 }
1561 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1562
1563 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1564 {
1565 struct inet6_dev *idev;
1566 struct inet6_ifaddr *ifa;
1567 int onlink;
1568
1569 onlink = 0;
1570 rcu_read_lock();
1571 idev = __in6_dev_get(dev);
1572 if (idev) {
1573 read_lock_bh(&idev->lock);
1574 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1575 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1576 ifa->prefix_len);
1577 if (onlink)
1578 break;
1579 }
1580 read_unlock_bh(&idev->lock);
1581 }
1582 rcu_read_unlock();
1583 return onlink;
1584 }
1585 EXPORT_SYMBOL(ipv6_chk_prefix);
1586
1587 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1588 struct net_device *dev, int strict)
1589 {
1590 struct inet6_ifaddr *ifp, *result = NULL;
1591 unsigned int hash = inet6_addr_hash(addr);
1592
1593 rcu_read_lock_bh();
1594 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1595 if (!net_eq(dev_net(ifp->idev->dev), net))
1596 continue;
1597 if (ipv6_addr_equal(&ifp->addr, addr)) {
1598 if (dev == NULL || ifp->idev->dev == dev ||
1599 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1600 result = ifp;
1601 in6_ifa_hold(ifp);
1602 break;
1603 }
1604 }
1605 }
1606 rcu_read_unlock_bh();
1607
1608 return result;
1609 }
1610
1611 /* Gets referenced address, destroys ifaddr */
1612
1613 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1614 {
1615 if (ifp->flags&IFA_F_PERMANENT) {
1616 spin_lock_bh(&ifp->lock);
1617 addrconf_del_dad_work(ifp);
1618 ifp->flags |= IFA_F_TENTATIVE;
1619 if (dad_failed)
1620 ifp->flags |= IFA_F_DADFAILED;
1621 spin_unlock_bh(&ifp->lock);
1622 if (dad_failed)
1623 ipv6_ifa_notify(0, ifp);
1624 in6_ifa_put(ifp);
1625 } else if (ifp->flags&IFA_F_TEMPORARY) {
1626 struct inet6_ifaddr *ifpub;
1627 spin_lock_bh(&ifp->lock);
1628 ifpub = ifp->ifpub;
1629 if (ifpub) {
1630 in6_ifa_hold(ifpub);
1631 spin_unlock_bh(&ifp->lock);
1632 ipv6_create_tempaddr(ifpub, ifp);
1633 in6_ifa_put(ifpub);
1634 } else {
1635 spin_unlock_bh(&ifp->lock);
1636 }
1637 ipv6_del_addr(ifp);
1638 } else {
1639 ipv6_del_addr(ifp);
1640 }
1641 }
1642
1643 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1644 {
1645 int err = -ENOENT;
1646
1647 spin_lock_bh(&ifp->state_lock);
1648 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1649 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1650 err = 0;
1651 }
1652 spin_unlock_bh(&ifp->state_lock);
1653
1654 return err;
1655 }
1656
1657 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1658 {
1659 struct inet6_dev *idev = ifp->idev;
1660
1661 if (addrconf_dad_end(ifp)) {
1662 in6_ifa_put(ifp);
1663 return;
1664 }
1665
1666 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1667 ifp->idev->dev->name, &ifp->addr);
1668
1669 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1670 struct in6_addr addr;
1671
1672 addr.s6_addr32[0] = htonl(0xfe800000);
1673 addr.s6_addr32[1] = 0;
1674
1675 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1676 ipv6_addr_equal(&ifp->addr, &addr)) {
1677 /* DAD failed for link-local based on MAC address */
1678 idev->cnf.disable_ipv6 = 1;
1679
1680 pr_info("%s: IPv6 being disabled!\n",
1681 ifp->idev->dev->name);
1682 }
1683 }
1684
1685 spin_lock_bh(&ifp->state_lock);
1686 /* transition from _POSTDAD to _ERRDAD */
1687 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1688 spin_unlock_bh(&ifp->state_lock);
1689
1690 addrconf_mod_dad_work(ifp, 0);
1691 }
1692
1693 /* Join to solicited addr multicast group.
1694 * caller must hold RTNL */
1695 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1696 {
1697 struct in6_addr maddr;
1698
1699 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1700 return;
1701
1702 addrconf_addr_solict_mult(addr, &maddr);
1703 ipv6_dev_mc_inc(dev, &maddr);
1704 }
1705
1706 /* caller must hold RTNL */
1707 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1708 {
1709 struct in6_addr maddr;
1710
1711 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1712 return;
1713
1714 addrconf_addr_solict_mult(addr, &maddr);
1715 __ipv6_dev_mc_dec(idev, &maddr);
1716 }
1717
1718 /* caller must hold RTNL */
1719 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1720 {
1721 struct in6_addr addr;
1722
1723 if (ifp->prefix_len >= 127) /* RFC 6164 */
1724 return;
1725 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1726 if (ipv6_addr_any(&addr))
1727 return;
1728 __ipv6_dev_ac_inc(ifp->idev, &addr);
1729 }
1730
1731 /* caller must hold RTNL */
1732 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1733 {
1734 struct in6_addr addr;
1735
1736 if (ifp->prefix_len >= 127) /* RFC 6164 */
1737 return;
1738 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1739 if (ipv6_addr_any(&addr))
1740 return;
1741 __ipv6_dev_ac_dec(ifp->idev, &addr);
1742 }
1743
1744 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1745 {
1746 if (dev->addr_len != ETH_ALEN)
1747 return -1;
1748 memcpy(eui, dev->dev_addr, 3);
1749 memcpy(eui + 5, dev->dev_addr + 3, 3);
1750
1751 /*
1752 * The zSeries OSA network cards can be shared among various
1753 * OS instances, but the OSA cards have only one MAC address.
1754 * This leads to duplicate address conflicts in conjunction
1755 * with IPv6 if more than one instance uses the same card.
1756 *
1757 * The driver for these cards can deliver a unique 16-bit
1758 * identifier for each instance sharing the same card. It is
1759 * placed instead of 0xFFFE in the interface identifier. The
1760 * "u" bit of the interface identifier is not inverted in this
1761 * case. Hence the resulting interface identifier has local
1762 * scope according to RFC2373.
1763 */
1764 if (dev->dev_id) {
1765 eui[3] = (dev->dev_id >> 8) & 0xFF;
1766 eui[4] = dev->dev_id & 0xFF;
1767 } else {
1768 eui[3] = 0xFF;
1769 eui[4] = 0xFE;
1770 eui[0] ^= 2;
1771 }
1772 return 0;
1773 }
1774
1775 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1776 {
1777 if (dev->addr_len != IEEE802154_ADDR_LEN)
1778 return -1;
1779 memcpy(eui, dev->dev_addr, 8);
1780 eui[0] ^= 2;
1781 return 0;
1782 }
1783
1784 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1785 {
1786 union fwnet_hwaddr *ha;
1787
1788 if (dev->addr_len != FWNET_ALEN)
1789 return -1;
1790
1791 ha = (union fwnet_hwaddr *)dev->dev_addr;
1792
1793 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1794 eui[0] ^= 2;
1795 return 0;
1796 }
1797
1798 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1799 {
1800 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1801 if (dev->addr_len != ARCNET_ALEN)
1802 return -1;
1803 memset(eui, 0, 7);
1804 eui[7] = *(u8 *)dev->dev_addr;
1805 return 0;
1806 }
1807
1808 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1809 {
1810 if (dev->addr_len != INFINIBAND_ALEN)
1811 return -1;
1812 memcpy(eui, dev->dev_addr + 12, 8);
1813 eui[0] |= 2;
1814 return 0;
1815 }
1816
1817 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1818 {
1819 if (addr == 0)
1820 return -1;
1821 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1822 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1823 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1824 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1825 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1826 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1827 eui[1] = 0;
1828 eui[2] = 0x5E;
1829 eui[3] = 0xFE;
1830 memcpy(eui + 4, &addr, 4);
1831 return 0;
1832 }
1833
1834 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1835 {
1836 if (dev->priv_flags & IFF_ISATAP)
1837 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1838 return -1;
1839 }
1840
1841 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1842 {
1843 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1844 }
1845
1846 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1847 {
1848 memcpy(eui, dev->perm_addr, 3);
1849 memcpy(eui + 5, dev->perm_addr + 3, 3);
1850 eui[3] = 0xFF;
1851 eui[4] = 0xFE;
1852 eui[0] ^= 2;
1853 return 0;
1854 }
1855
1856 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1857 {
1858 switch (dev->type) {
1859 case ARPHRD_ETHER:
1860 case ARPHRD_FDDI:
1861 return addrconf_ifid_eui48(eui, dev);
1862 case ARPHRD_ARCNET:
1863 return addrconf_ifid_arcnet(eui, dev);
1864 case ARPHRD_INFINIBAND:
1865 return addrconf_ifid_infiniband(eui, dev);
1866 case ARPHRD_SIT:
1867 return addrconf_ifid_sit(eui, dev);
1868 case ARPHRD_IPGRE:
1869 return addrconf_ifid_gre(eui, dev);
1870 case ARPHRD_6LOWPAN:
1871 case ARPHRD_IEEE802154:
1872 return addrconf_ifid_eui64(eui, dev);
1873 case ARPHRD_IEEE1394:
1874 return addrconf_ifid_ieee1394(eui, dev);
1875 case ARPHRD_TUNNEL6:
1876 return addrconf_ifid_ip6tnl(eui, dev);
1877 }
1878 return -1;
1879 }
1880
1881 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1882 {
1883 int err = -1;
1884 struct inet6_ifaddr *ifp;
1885
1886 read_lock_bh(&idev->lock);
1887 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1888 if (ifp->scope > IFA_LINK)
1889 break;
1890 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1891 memcpy(eui, ifp->addr.s6_addr+8, 8);
1892 err = 0;
1893 break;
1894 }
1895 }
1896 read_unlock_bh(&idev->lock);
1897 return err;
1898 }
1899
1900 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1901 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1902 {
1903 regen:
1904 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1905 idev->rndid[0] &= ~0x02;
1906
1907 /*
1908 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1909 * check if generated address is not inappropriate
1910 *
1911 * - Reserved subnet anycast (RFC 2526)
1912 * 11111101 11....11 1xxxxxxx
1913 * - ISATAP (RFC4214) 6.1
1914 * 00-00-5E-FE-xx-xx-xx-xx
1915 * - value 0
1916 * - XXX: already assigned to an address on the device
1917 */
1918 if (idev->rndid[0] == 0xfd &&
1919 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1920 (idev->rndid[7]&0x80))
1921 goto regen;
1922 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1923 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1924 goto regen;
1925 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1926 goto regen;
1927 }
1928 }
1929
1930 static void ipv6_regen_rndid(unsigned long data)
1931 {
1932 struct inet6_dev *idev = (struct inet6_dev *) data;
1933 unsigned long expires;
1934
1935 rcu_read_lock_bh();
1936 write_lock_bh(&idev->lock);
1937
1938 if (idev->dead)
1939 goto out;
1940
1941 __ipv6_regen_rndid(idev);
1942
1943 expires = jiffies +
1944 idev->cnf.temp_prefered_lft * HZ -
1945 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1946 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
1947 idev->cnf.max_desync_factor * HZ;
1948 if (time_before(expires, jiffies)) {
1949 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1950 __func__, idev->dev->name);
1951 goto out;
1952 }
1953
1954 if (!mod_timer(&idev->regen_timer, expires))
1955 in6_dev_hold(idev);
1956
1957 out:
1958 write_unlock_bh(&idev->lock);
1959 rcu_read_unlock_bh();
1960 in6_dev_put(idev);
1961 }
1962
1963 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1964 {
1965 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1966 __ipv6_regen_rndid(idev);
1967 }
1968
1969 /*
1970 * Add prefix route.
1971 */
1972
1973 static void
1974 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1975 unsigned long expires, u32 flags)
1976 {
1977 struct fib6_config cfg = {
1978 .fc_table = RT6_TABLE_PREFIX,
1979 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1980 .fc_ifindex = dev->ifindex,
1981 .fc_expires = expires,
1982 .fc_dst_len = plen,
1983 .fc_flags = RTF_UP | flags,
1984 .fc_nlinfo.nl_net = dev_net(dev),
1985 .fc_protocol = RTPROT_KERNEL,
1986 };
1987
1988 cfg.fc_dst = *pfx;
1989
1990 /* Prevent useless cloning on PtP SIT.
1991 This thing is done here expecting that the whole
1992 class of non-broadcast devices need not cloning.
1993 */
1994 #if IS_ENABLED(CONFIG_IPV6_SIT)
1995 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1996 cfg.fc_flags |= RTF_NONEXTHOP;
1997 #endif
1998
1999 ip6_route_add(&cfg);
2000 }
2001
2002
2003 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2004 int plen,
2005 const struct net_device *dev,
2006 u32 flags, u32 noflags)
2007 {
2008 struct fib6_node *fn;
2009 struct rt6_info *rt = NULL;
2010 struct fib6_table *table;
2011
2012 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2013 if (table == NULL)
2014 return NULL;
2015
2016 read_lock_bh(&table->tb6_lock);
2017 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2018 if (!fn)
2019 goto out;
2020 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2021 if (rt->dst.dev->ifindex != dev->ifindex)
2022 continue;
2023 if ((rt->rt6i_flags & flags) != flags)
2024 continue;
2025 if ((rt->rt6i_flags & noflags) != 0)
2026 continue;
2027 dst_hold(&rt->dst);
2028 break;
2029 }
2030 out:
2031 read_unlock_bh(&table->tb6_lock);
2032 return rt;
2033 }
2034
2035
2036 /* Create "default" multicast route to the interface */
2037
2038 static void addrconf_add_mroute(struct net_device *dev)
2039 {
2040 struct fib6_config cfg = {
2041 .fc_table = RT6_TABLE_LOCAL,
2042 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2043 .fc_ifindex = dev->ifindex,
2044 .fc_dst_len = 8,
2045 .fc_flags = RTF_UP,
2046 .fc_nlinfo.nl_net = dev_net(dev),
2047 };
2048
2049 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2050
2051 ip6_route_add(&cfg);
2052 }
2053
2054 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2055 {
2056 struct inet6_dev *idev;
2057
2058 ASSERT_RTNL();
2059
2060 idev = ipv6_find_idev(dev);
2061 if (!idev)
2062 return ERR_PTR(-ENOBUFS);
2063
2064 if (idev->cnf.disable_ipv6)
2065 return ERR_PTR(-EACCES);
2066
2067 /* Add default multicast route */
2068 if (!(dev->flags & IFF_LOOPBACK))
2069 addrconf_add_mroute(dev);
2070
2071 return idev;
2072 }
2073
2074 static void manage_tempaddrs(struct inet6_dev *idev,
2075 struct inet6_ifaddr *ifp,
2076 __u32 valid_lft, __u32 prefered_lft,
2077 bool create, unsigned long now)
2078 {
2079 u32 flags;
2080 struct inet6_ifaddr *ift;
2081
2082 read_lock_bh(&idev->lock);
2083 /* update all temporary addresses in the list */
2084 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2085 int age, max_valid, max_prefered;
2086
2087 if (ifp != ift->ifpub)
2088 continue;
2089
2090 /* RFC 4941 section 3.3:
2091 * If a received option will extend the lifetime of a public
2092 * address, the lifetimes of temporary addresses should
2093 * be extended, subject to the overall constraint that no
2094 * temporary addresses should ever remain "valid" or "preferred"
2095 * for a time longer than (TEMP_VALID_LIFETIME) or
2096 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2097 */
2098 age = (now - ift->cstamp) / HZ;
2099 max_valid = idev->cnf.temp_valid_lft - age;
2100 if (max_valid < 0)
2101 max_valid = 0;
2102
2103 max_prefered = idev->cnf.temp_prefered_lft -
2104 idev->cnf.max_desync_factor - age;
2105 if (max_prefered < 0)
2106 max_prefered = 0;
2107
2108 if (valid_lft > max_valid)
2109 valid_lft = max_valid;
2110
2111 if (prefered_lft > max_prefered)
2112 prefered_lft = max_prefered;
2113
2114 spin_lock(&ift->lock);
2115 flags = ift->flags;
2116 ift->valid_lft = valid_lft;
2117 ift->prefered_lft = prefered_lft;
2118 ift->tstamp = now;
2119 if (prefered_lft > 0)
2120 ift->flags &= ~IFA_F_DEPRECATED;
2121
2122 spin_unlock(&ift->lock);
2123 if (!(flags&IFA_F_TENTATIVE))
2124 ipv6_ifa_notify(0, ift);
2125 }
2126
2127 if ((create || list_empty(&idev->tempaddr_list)) &&
2128 idev->cnf.use_tempaddr > 0) {
2129 /* When a new public address is created as described
2130 * in [ADDRCONF], also create a new temporary address.
2131 * Also create a temporary address if it's enabled but
2132 * no temporary address currently exists.
2133 */
2134 read_unlock_bh(&idev->lock);
2135 ipv6_create_tempaddr(ifp, NULL);
2136 } else {
2137 read_unlock_bh(&idev->lock);
2138 }
2139 }
2140
2141 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2142 {
2143 struct prefix_info *pinfo;
2144 __u32 valid_lft;
2145 __u32 prefered_lft;
2146 int addr_type;
2147 struct inet6_dev *in6_dev;
2148 struct net *net = dev_net(dev);
2149
2150 pinfo = (struct prefix_info *) opt;
2151
2152 if (len < sizeof(struct prefix_info)) {
2153 ADBG("addrconf: prefix option too short\n");
2154 return;
2155 }
2156
2157 /*
2158 * Validation checks ([ADDRCONF], page 19)
2159 */
2160
2161 addr_type = ipv6_addr_type(&pinfo->prefix);
2162
2163 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2164 return;
2165
2166 valid_lft = ntohl(pinfo->valid);
2167 prefered_lft = ntohl(pinfo->prefered);
2168
2169 if (prefered_lft > valid_lft) {
2170 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2171 return;
2172 }
2173
2174 in6_dev = in6_dev_get(dev);
2175
2176 if (in6_dev == NULL) {
2177 net_dbg_ratelimited("addrconf: device %s not configured\n",
2178 dev->name);
2179 return;
2180 }
2181
2182 /*
2183 * Two things going on here:
2184 * 1) Add routes for on-link prefixes
2185 * 2) Configure prefixes with the auto flag set
2186 */
2187
2188 if (pinfo->onlink) {
2189 struct rt6_info *rt;
2190 unsigned long rt_expires;
2191
2192 /* Avoid arithmetic overflow. Really, we could
2193 * save rt_expires in seconds, likely valid_lft,
2194 * but it would require division in fib gc, that it
2195 * not good.
2196 */
2197 if (HZ > USER_HZ)
2198 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2199 else
2200 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2201
2202 if (addrconf_finite_timeout(rt_expires))
2203 rt_expires *= HZ;
2204
2205 rt = addrconf_get_prefix_route(&pinfo->prefix,
2206 pinfo->prefix_len,
2207 dev,
2208 RTF_ADDRCONF | RTF_PREFIX_RT,
2209 RTF_GATEWAY | RTF_DEFAULT);
2210
2211 if (rt) {
2212 /* Autoconf prefix route */
2213 if (valid_lft == 0) {
2214 ip6_del_rt(rt);
2215 rt = NULL;
2216 } else if (addrconf_finite_timeout(rt_expires)) {
2217 /* not infinity */
2218 rt6_set_expires(rt, jiffies + rt_expires);
2219 } else {
2220 rt6_clean_expires(rt);
2221 }
2222 } else if (valid_lft) {
2223 clock_t expires = 0;
2224 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2225 if (addrconf_finite_timeout(rt_expires)) {
2226 /* not infinity */
2227 flags |= RTF_EXPIRES;
2228 expires = jiffies_to_clock_t(rt_expires);
2229 }
2230 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2231 dev, expires, flags);
2232 }
2233 ip6_rt_put(rt);
2234 }
2235
2236 /* Try to figure out our local address for this prefix */
2237
2238 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2239 struct inet6_ifaddr *ifp;
2240 struct in6_addr addr;
2241 int create = 0, update_lft = 0;
2242 bool tokenized = false;
2243
2244 if (pinfo->prefix_len == 64) {
2245 memcpy(&addr, &pinfo->prefix, 8);
2246
2247 if (!ipv6_addr_any(&in6_dev->token)) {
2248 read_lock_bh(&in6_dev->lock);
2249 memcpy(addr.s6_addr + 8,
2250 in6_dev->token.s6_addr + 8, 8);
2251 read_unlock_bh(&in6_dev->lock);
2252 tokenized = true;
2253 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2254 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2255 in6_dev_put(in6_dev);
2256 return;
2257 }
2258 goto ok;
2259 }
2260 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2261 pinfo->prefix_len);
2262 in6_dev_put(in6_dev);
2263 return;
2264
2265 ok:
2266
2267 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2268
2269 if (ifp == NULL && valid_lft) {
2270 int max_addresses = in6_dev->cnf.max_addresses;
2271 u32 addr_flags = 0;
2272
2273 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2274 if (in6_dev->cnf.optimistic_dad &&
2275 !net->ipv6.devconf_all->forwarding && sllao)
2276 addr_flags = IFA_F_OPTIMISTIC;
2277 #endif
2278
2279 /* Do not allow to create too much of autoconfigured
2280 * addresses; this would be too easy way to crash kernel.
2281 */
2282 if (!max_addresses ||
2283 ipv6_count_addresses(in6_dev) < max_addresses)
2284 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2285 pinfo->prefix_len,
2286 addr_type&IPV6_ADDR_SCOPE_MASK,
2287 addr_flags, valid_lft,
2288 prefered_lft);
2289
2290 if (IS_ERR_OR_NULL(ifp)) {
2291 in6_dev_put(in6_dev);
2292 return;
2293 }
2294
2295 update_lft = 0;
2296 create = 1;
2297 spin_lock_bh(&ifp->lock);
2298 ifp->flags |= IFA_F_MANAGETEMPADDR;
2299 ifp->cstamp = jiffies;
2300 ifp->tokenized = tokenized;
2301 spin_unlock_bh(&ifp->lock);
2302 addrconf_dad_start(ifp);
2303 }
2304
2305 if (ifp) {
2306 u32 flags;
2307 unsigned long now;
2308 u32 stored_lft;
2309
2310 /* update lifetime (RFC2462 5.5.3 e) */
2311 spin_lock(&ifp->lock);
2312 now = jiffies;
2313 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2314 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2315 else
2316 stored_lft = 0;
2317 if (!update_lft && !create && stored_lft) {
2318 const u32 minimum_lft = min(
2319 stored_lft, (u32)MIN_VALID_LIFETIME);
2320 valid_lft = max(valid_lft, minimum_lft);
2321
2322 /* RFC4862 Section 5.5.3e:
2323 * "Note that the preferred lifetime of the
2324 * corresponding address is always reset to
2325 * the Preferred Lifetime in the received
2326 * Prefix Information option, regardless of
2327 * whether the valid lifetime is also reset or
2328 * ignored."
2329 *
2330 * So we should always update prefered_lft here.
2331 */
2332 update_lft = 1;
2333 }
2334
2335 if (update_lft) {
2336 ifp->valid_lft = valid_lft;
2337 ifp->prefered_lft = prefered_lft;
2338 ifp->tstamp = now;
2339 flags = ifp->flags;
2340 ifp->flags &= ~IFA_F_DEPRECATED;
2341 spin_unlock(&ifp->lock);
2342
2343 if (!(flags&IFA_F_TENTATIVE))
2344 ipv6_ifa_notify(0, ifp);
2345 } else
2346 spin_unlock(&ifp->lock);
2347
2348 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2349 create, now);
2350
2351 in6_ifa_put(ifp);
2352 addrconf_verify();
2353 }
2354 }
2355 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2356 in6_dev_put(in6_dev);
2357 }
2358
2359 /*
2360 * Set destination address.
2361 * Special case for SIT interfaces where we create a new "virtual"
2362 * device.
2363 */
2364 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2365 {
2366 struct in6_ifreq ireq;
2367 struct net_device *dev;
2368 int err = -EINVAL;
2369
2370 rtnl_lock();
2371
2372 err = -EFAULT;
2373 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2374 goto err_exit;
2375
2376 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2377
2378 err = -ENODEV;
2379 if (dev == NULL)
2380 goto err_exit;
2381
2382 #if IS_ENABLED(CONFIG_IPV6_SIT)
2383 if (dev->type == ARPHRD_SIT) {
2384 const struct net_device_ops *ops = dev->netdev_ops;
2385 struct ifreq ifr;
2386 struct ip_tunnel_parm p;
2387
2388 err = -EADDRNOTAVAIL;
2389 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2390 goto err_exit;
2391
2392 memset(&p, 0, sizeof(p));
2393 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2394 p.iph.saddr = 0;
2395 p.iph.version = 4;
2396 p.iph.ihl = 5;
2397 p.iph.protocol = IPPROTO_IPV6;
2398 p.iph.ttl = 64;
2399 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2400
2401 if (ops->ndo_do_ioctl) {
2402 mm_segment_t oldfs = get_fs();
2403
2404 set_fs(KERNEL_DS);
2405 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2406 set_fs(oldfs);
2407 } else
2408 err = -EOPNOTSUPP;
2409
2410 if (err == 0) {
2411 err = -ENOBUFS;
2412 dev = __dev_get_by_name(net, p.name);
2413 if (!dev)
2414 goto err_exit;
2415 err = dev_open(dev);
2416 }
2417 }
2418 #endif
2419
2420 err_exit:
2421 rtnl_unlock();
2422 return err;
2423 }
2424
2425 /*
2426 * Manual configuration of address on an interface
2427 */
2428 static int inet6_addr_add(struct net *net, int ifindex,
2429 const struct in6_addr *pfx,
2430 const struct in6_addr *peer_pfx,
2431 unsigned int plen, __u32 ifa_flags,
2432 __u32 prefered_lft, __u32 valid_lft)
2433 {
2434 struct inet6_ifaddr *ifp;
2435 struct inet6_dev *idev;
2436 struct net_device *dev;
2437 int scope;
2438 u32 flags;
2439 clock_t expires;
2440 unsigned long timeout;
2441
2442 ASSERT_RTNL();
2443
2444 if (plen > 128)
2445 return -EINVAL;
2446
2447 /* check the lifetime */
2448 if (!valid_lft || prefered_lft > valid_lft)
2449 return -EINVAL;
2450
2451 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2452 return -EINVAL;
2453
2454 dev = __dev_get_by_index(net, ifindex);
2455 if (!dev)
2456 return -ENODEV;
2457
2458 idev = addrconf_add_dev(dev);
2459 if (IS_ERR(idev))
2460 return PTR_ERR(idev);
2461
2462 scope = ipv6_addr_scope(pfx);
2463
2464 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2465 if (addrconf_finite_timeout(timeout)) {
2466 expires = jiffies_to_clock_t(timeout * HZ);
2467 valid_lft = timeout;
2468 flags = RTF_EXPIRES;
2469 } else {
2470 expires = 0;
2471 flags = 0;
2472 ifa_flags |= IFA_F_PERMANENT;
2473 }
2474
2475 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2476 if (addrconf_finite_timeout(timeout)) {
2477 if (timeout == 0)
2478 ifa_flags |= IFA_F_DEPRECATED;
2479 prefered_lft = timeout;
2480 }
2481
2482 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2483 valid_lft, prefered_lft);
2484
2485 if (!IS_ERR(ifp)) {
2486 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2487 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2488 expires, flags);
2489 }
2490
2491 /*
2492 * Note that section 3.1 of RFC 4429 indicates
2493 * that the Optimistic flag should not be set for
2494 * manually configured addresses
2495 */
2496 addrconf_dad_start(ifp);
2497 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2498 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2499 true, jiffies);
2500 in6_ifa_put(ifp);
2501 addrconf_verify_rtnl();
2502 return 0;
2503 }
2504
2505 return PTR_ERR(ifp);
2506 }
2507
2508 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2509 const struct in6_addr *pfx, unsigned int plen)
2510 {
2511 struct inet6_ifaddr *ifp;
2512 struct inet6_dev *idev;
2513 struct net_device *dev;
2514
2515 if (plen > 128)
2516 return -EINVAL;
2517
2518 dev = __dev_get_by_index(net, ifindex);
2519 if (!dev)
2520 return -ENODEV;
2521
2522 if ((idev = __in6_dev_get(dev)) == NULL)
2523 return -ENXIO;
2524
2525 read_lock_bh(&idev->lock);
2526 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2527 if (ifp->prefix_len == plen &&
2528 ipv6_addr_equal(pfx, &ifp->addr)) {
2529 in6_ifa_hold(ifp);
2530 read_unlock_bh(&idev->lock);
2531
2532 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2533 (ifa_flags & IFA_F_MANAGETEMPADDR))
2534 manage_tempaddrs(idev, ifp, 0, 0, false,
2535 jiffies);
2536 ipv6_del_addr(ifp);
2537 addrconf_verify_rtnl();
2538 return 0;
2539 }
2540 }
2541 read_unlock_bh(&idev->lock);
2542 return -EADDRNOTAVAIL;
2543 }
2544
2545
2546 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2547 {
2548 struct in6_ifreq ireq;
2549 int err;
2550
2551 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2552 return -EPERM;
2553
2554 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2555 return -EFAULT;
2556
2557 rtnl_lock();
2558 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2559 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2560 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2561 rtnl_unlock();
2562 return err;
2563 }
2564
2565 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2566 {
2567 struct in6_ifreq ireq;
2568 int err;
2569
2570 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2571 return -EPERM;
2572
2573 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2574 return -EFAULT;
2575
2576 rtnl_lock();
2577 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2578 ireq.ifr6_prefixlen);
2579 rtnl_unlock();
2580 return err;
2581 }
2582
2583 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2584 int plen, int scope)
2585 {
2586 struct inet6_ifaddr *ifp;
2587
2588 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2589 scope, IFA_F_PERMANENT,
2590 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2591 if (!IS_ERR(ifp)) {
2592 spin_lock_bh(&ifp->lock);
2593 ifp->flags &= ~IFA_F_TENTATIVE;
2594 spin_unlock_bh(&ifp->lock);
2595 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2596 in6_ifa_put(ifp);
2597 }
2598 }
2599
2600 #if IS_ENABLED(CONFIG_IPV6_SIT)
2601 static void sit_add_v4_addrs(struct inet6_dev *idev)
2602 {
2603 struct in6_addr addr;
2604 struct net_device *dev;
2605 struct net *net = dev_net(idev->dev);
2606 int scope, plen;
2607 u32 pflags = 0;
2608
2609 ASSERT_RTNL();
2610
2611 memset(&addr, 0, sizeof(struct in6_addr));
2612 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2613
2614 if (idev->dev->flags&IFF_POINTOPOINT) {
2615 addr.s6_addr32[0] = htonl(0xfe800000);
2616 scope = IFA_LINK;
2617 plen = 64;
2618 } else {
2619 scope = IPV6_ADDR_COMPATv4;
2620 plen = 96;
2621 pflags |= RTF_NONEXTHOP;
2622 }
2623
2624 if (addr.s6_addr32[3]) {
2625 add_addr(idev, &addr, plen, scope);
2626 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2627 return;
2628 }
2629
2630 for_each_netdev(net, dev) {
2631 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2632 if (in_dev && (dev->flags & IFF_UP)) {
2633 struct in_ifaddr *ifa;
2634
2635 int flag = scope;
2636
2637 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2638
2639 addr.s6_addr32[3] = ifa->ifa_local;
2640
2641 if (ifa->ifa_scope == RT_SCOPE_LINK)
2642 continue;
2643 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2644 if (idev->dev->flags&IFF_POINTOPOINT)
2645 continue;
2646 flag |= IFA_HOST;
2647 }
2648
2649 add_addr(idev, &addr, plen, flag);
2650 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2651 pflags);
2652 }
2653 }
2654 }
2655 }
2656 #endif
2657
2658 static void init_loopback(struct net_device *dev)
2659 {
2660 struct inet6_dev *idev;
2661 struct net_device *sp_dev;
2662 struct inet6_ifaddr *sp_ifa;
2663 struct rt6_info *sp_rt;
2664
2665 /* ::1 */
2666
2667 ASSERT_RTNL();
2668
2669 if ((idev = ipv6_find_idev(dev)) == NULL) {
2670 pr_debug("%s: add_dev failed\n", __func__);
2671 return;
2672 }
2673
2674 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2675
2676 /* Add routes to other interface's IPv6 addresses */
2677 for_each_netdev(dev_net(dev), sp_dev) {
2678 if (!strcmp(sp_dev->name, dev->name))
2679 continue;
2680
2681 idev = __in6_dev_get(sp_dev);
2682 if (!idev)
2683 continue;
2684
2685 read_lock_bh(&idev->lock);
2686 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2687
2688 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2689 continue;
2690
2691 if (sp_ifa->rt) {
2692 /* This dst has been added to garbage list when
2693 * lo device down, release this obsolete dst and
2694 * reallocate a new router for ifa.
2695 */
2696 if (sp_ifa->rt->dst.obsolete > 0) {
2697 ip6_rt_put(sp_ifa->rt);
2698 sp_ifa->rt = NULL;
2699 } else {
2700 continue;
2701 }
2702 }
2703
2704 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2705
2706 /* Failure cases are ignored */
2707 if (!IS_ERR(sp_rt)) {
2708 sp_ifa->rt = sp_rt;
2709 ip6_ins_rt(sp_rt);
2710 }
2711 }
2712 read_unlock_bh(&idev->lock);
2713 }
2714 }
2715
2716 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2717 {
2718 struct inet6_ifaddr *ifp;
2719 u32 addr_flags = IFA_F_PERMANENT;
2720
2721 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2722 if (idev->cnf.optimistic_dad &&
2723 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2724 addr_flags |= IFA_F_OPTIMISTIC;
2725 #endif
2726
2727
2728 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2729 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2730 if (!IS_ERR(ifp)) {
2731 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2732 addrconf_dad_start(ifp);
2733 in6_ifa_put(ifp);
2734 }
2735 }
2736
2737 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
2738 {
2739 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
2740 struct in6_addr addr;
2741
2742 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2743 /* addrconf_add_linklocal also adds a prefix_route and we
2744 * only need to care about prefix routes if ipv6_generate_eui64
2745 * couldn't generate one.
2746 */
2747 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
2748 addrconf_add_linklocal(idev, &addr);
2749 else if (prefix_route)
2750 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2751 }
2752 }
2753
2754 static void addrconf_dev_config(struct net_device *dev)
2755 {
2756 struct inet6_dev *idev;
2757
2758 ASSERT_RTNL();
2759
2760 if ((dev->type != ARPHRD_ETHER) &&
2761 (dev->type != ARPHRD_FDDI) &&
2762 (dev->type != ARPHRD_ARCNET) &&
2763 (dev->type != ARPHRD_INFINIBAND) &&
2764 (dev->type != ARPHRD_IEEE802154) &&
2765 (dev->type != ARPHRD_IEEE1394) &&
2766 (dev->type != ARPHRD_TUNNEL6) &&
2767 (dev->type != ARPHRD_6LOWPAN)) {
2768 /* Alas, we support only Ethernet autoconfiguration. */
2769 return;
2770 }
2771
2772 idev = addrconf_add_dev(dev);
2773 if (IS_ERR(idev))
2774 return;
2775
2776 addrconf_addr_gen(idev, false);
2777 }
2778
2779 #if IS_ENABLED(CONFIG_IPV6_SIT)
2780 static void addrconf_sit_config(struct net_device *dev)
2781 {
2782 struct inet6_dev *idev;
2783
2784 ASSERT_RTNL();
2785
2786 /*
2787 * Configure the tunnel with one of our IPv4
2788 * addresses... we should configure all of
2789 * our v4 addrs in the tunnel
2790 */
2791
2792 if ((idev = ipv6_find_idev(dev)) == NULL) {
2793 pr_debug("%s: add_dev failed\n", __func__);
2794 return;
2795 }
2796
2797 if (dev->priv_flags & IFF_ISATAP) {
2798 addrconf_addr_gen(idev, false);
2799 return;
2800 }
2801
2802 sit_add_v4_addrs(idev);
2803
2804 if (dev->flags&IFF_POINTOPOINT)
2805 addrconf_add_mroute(dev);
2806 }
2807 #endif
2808
2809 #if IS_ENABLED(CONFIG_NET_IPGRE)
2810 static void addrconf_gre_config(struct net_device *dev)
2811 {
2812 struct inet6_dev *idev;
2813
2814 ASSERT_RTNL();
2815
2816 if ((idev = ipv6_find_idev(dev)) == NULL) {
2817 pr_debug("%s: add_dev failed\n", __func__);
2818 return;
2819 }
2820
2821 addrconf_addr_gen(idev, true);
2822 }
2823 #endif
2824
2825 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2826 void *ptr)
2827 {
2828 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2829 struct inet6_dev *idev = __in6_dev_get(dev);
2830 int run_pending = 0;
2831 int err;
2832
2833 switch (event) {
2834 case NETDEV_REGISTER:
2835 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2836 idev = ipv6_add_dev(dev);
2837 if (IS_ERR(idev))
2838 return notifier_from_errno(PTR_ERR(idev));
2839 }
2840 break;
2841
2842 case NETDEV_UP:
2843 case NETDEV_CHANGE:
2844 if (dev->flags & IFF_SLAVE)
2845 break;
2846
2847 if (idev && idev->cnf.disable_ipv6)
2848 break;
2849
2850 if (event == NETDEV_UP) {
2851 if (!addrconf_qdisc_ok(dev)) {
2852 /* device is not ready yet. */
2853 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2854 dev->name);
2855 break;
2856 }
2857
2858 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2859 idev = ipv6_add_dev(dev);
2860
2861 if (!IS_ERR_OR_NULL(idev)) {
2862 idev->if_flags |= IF_READY;
2863 run_pending = 1;
2864 }
2865 } else {
2866 if (!addrconf_qdisc_ok(dev)) {
2867 /* device is still not ready. */
2868 break;
2869 }
2870
2871 if (idev) {
2872 if (idev->if_flags & IF_READY)
2873 /* device is already configured. */
2874 break;
2875 idev->if_flags |= IF_READY;
2876 }
2877
2878 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2879 dev->name);
2880
2881 run_pending = 1;
2882 }
2883
2884 switch (dev->type) {
2885 #if IS_ENABLED(CONFIG_IPV6_SIT)
2886 case ARPHRD_SIT:
2887 addrconf_sit_config(dev);
2888 break;
2889 #endif
2890 #if IS_ENABLED(CONFIG_NET_IPGRE)
2891 case ARPHRD_IPGRE:
2892 addrconf_gre_config(dev);
2893 break;
2894 #endif
2895 case ARPHRD_LOOPBACK:
2896 init_loopback(dev);
2897 break;
2898
2899 default:
2900 addrconf_dev_config(dev);
2901 break;
2902 }
2903
2904 if (!IS_ERR_OR_NULL(idev)) {
2905 if (run_pending)
2906 addrconf_dad_run(idev);
2907
2908 /*
2909 * If the MTU changed during the interface down,
2910 * when the interface up, the changed MTU must be
2911 * reflected in the idev as well as routers.
2912 */
2913 if (idev->cnf.mtu6 != dev->mtu &&
2914 dev->mtu >= IPV6_MIN_MTU) {
2915 rt6_mtu_change(dev, dev->mtu);
2916 idev->cnf.mtu6 = dev->mtu;
2917 }
2918 idev->tstamp = jiffies;
2919 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2920
2921 /*
2922 * If the changed mtu during down is lower than
2923 * IPV6_MIN_MTU stop IPv6 on this interface.
2924 */
2925 if (dev->mtu < IPV6_MIN_MTU)
2926 addrconf_ifdown(dev, 1);
2927 }
2928 break;
2929
2930 case NETDEV_CHANGEMTU:
2931 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2932 rt6_mtu_change(dev, dev->mtu);
2933 idev->cnf.mtu6 = dev->mtu;
2934 break;
2935 }
2936
2937 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2938 idev = ipv6_add_dev(dev);
2939 if (!IS_ERR(idev))
2940 break;
2941 }
2942
2943 /*
2944 * if MTU under IPV6_MIN_MTU.
2945 * Stop IPv6 on this interface.
2946 */
2947
2948 case NETDEV_DOWN:
2949 case NETDEV_UNREGISTER:
2950 /*
2951 * Remove all addresses from this interface.
2952 */
2953 addrconf_ifdown(dev, event != NETDEV_DOWN);
2954 break;
2955
2956 case NETDEV_CHANGENAME:
2957 if (idev) {
2958 snmp6_unregister_dev(idev);
2959 addrconf_sysctl_unregister(idev);
2960 err = addrconf_sysctl_register(idev);
2961 if (err)
2962 return notifier_from_errno(err);
2963 err = snmp6_register_dev(idev);
2964 if (err) {
2965 addrconf_sysctl_unregister(idev);
2966 return notifier_from_errno(err);
2967 }
2968 }
2969 break;
2970
2971 case NETDEV_PRE_TYPE_CHANGE:
2972 case NETDEV_POST_TYPE_CHANGE:
2973 addrconf_type_change(dev, event);
2974 break;
2975 }
2976
2977 return NOTIFY_OK;
2978 }
2979
2980 /*
2981 * addrconf module should be notified of a device going up
2982 */
2983 static struct notifier_block ipv6_dev_notf = {
2984 .notifier_call = addrconf_notify,
2985 };
2986
2987 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2988 {
2989 struct inet6_dev *idev;
2990 ASSERT_RTNL();
2991
2992 idev = __in6_dev_get(dev);
2993
2994 if (event == NETDEV_POST_TYPE_CHANGE)
2995 ipv6_mc_remap(idev);
2996 else if (event == NETDEV_PRE_TYPE_CHANGE)
2997 ipv6_mc_unmap(idev);
2998 }
2999
3000 static int addrconf_ifdown(struct net_device *dev, int how)
3001 {
3002 struct net *net = dev_net(dev);
3003 struct inet6_dev *idev;
3004 struct inet6_ifaddr *ifa;
3005 int state, i;
3006
3007 ASSERT_RTNL();
3008
3009 rt6_ifdown(net, dev);
3010 neigh_ifdown(&nd_tbl, dev);
3011
3012 idev = __in6_dev_get(dev);
3013 if (idev == NULL)
3014 return -ENODEV;
3015
3016 /*
3017 * Step 1: remove reference to ipv6 device from parent device.
3018 * Do not dev_put!
3019 */
3020 if (how) {
3021 idev->dead = 1;
3022
3023 /* protected by rtnl_lock */
3024 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3025
3026 /* Step 1.5: remove snmp6 entry */
3027 snmp6_unregister_dev(idev);
3028
3029 }
3030
3031 /* Step 2: clear hash table */
3032 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3033 struct hlist_head *h = &inet6_addr_lst[i];
3034
3035 spin_lock_bh(&addrconf_hash_lock);
3036 restart:
3037 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3038 if (ifa->idev == idev) {
3039 hlist_del_init_rcu(&ifa->addr_lst);
3040 addrconf_del_dad_work(ifa);
3041 goto restart;
3042 }
3043 }
3044 spin_unlock_bh(&addrconf_hash_lock);
3045 }
3046
3047 write_lock_bh(&idev->lock);
3048
3049 addrconf_del_rs_timer(idev);
3050
3051 /* Step 2: clear flags for stateless addrconf */
3052 if (!how)
3053 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3054
3055 if (how && del_timer(&idev->regen_timer))
3056 in6_dev_put(idev);
3057
3058 /* Step 3: clear tempaddr list */
3059 while (!list_empty(&idev->tempaddr_list)) {
3060 ifa = list_first_entry(&idev->tempaddr_list,
3061 struct inet6_ifaddr, tmp_list);
3062 list_del(&ifa->tmp_list);
3063 write_unlock_bh(&idev->lock);
3064 spin_lock_bh(&ifa->lock);
3065
3066 if (ifa->ifpub) {
3067 in6_ifa_put(ifa->ifpub);
3068 ifa->ifpub = NULL;
3069 }
3070 spin_unlock_bh(&ifa->lock);
3071 in6_ifa_put(ifa);
3072 write_lock_bh(&idev->lock);
3073 }
3074
3075 while (!list_empty(&idev->addr_list)) {
3076 ifa = list_first_entry(&idev->addr_list,
3077 struct inet6_ifaddr, if_list);
3078 addrconf_del_dad_work(ifa);
3079
3080 list_del(&ifa->if_list);
3081
3082 write_unlock_bh(&idev->lock);
3083
3084 spin_lock_bh(&ifa->state_lock);
3085 state = ifa->state;
3086 ifa->state = INET6_IFADDR_STATE_DEAD;
3087 spin_unlock_bh(&ifa->state_lock);
3088
3089 if (state != INET6_IFADDR_STATE_DEAD) {
3090 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3091 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3092 }
3093 in6_ifa_put(ifa);
3094
3095 write_lock_bh(&idev->lock);
3096 }
3097
3098 write_unlock_bh(&idev->lock);
3099
3100 /* Step 5: Discard anycast and multicast list */
3101 if (how) {
3102 ipv6_ac_destroy_dev(idev);
3103 ipv6_mc_destroy_dev(idev);
3104 } else {
3105 ipv6_mc_down(idev);
3106 }
3107
3108 idev->tstamp = jiffies;
3109
3110 /* Last: Shot the device (if unregistered) */
3111 if (how) {
3112 addrconf_sysctl_unregister(idev);
3113 neigh_parms_release(&nd_tbl, idev->nd_parms);
3114 neigh_ifdown(&nd_tbl, dev);
3115 in6_dev_put(idev);
3116 }
3117 return 0;
3118 }
3119
3120 static void addrconf_rs_timer(unsigned long data)
3121 {
3122 struct inet6_dev *idev = (struct inet6_dev *)data;
3123 struct net_device *dev = idev->dev;
3124 struct in6_addr lladdr;
3125
3126 write_lock(&idev->lock);
3127 if (idev->dead || !(idev->if_flags & IF_READY))
3128 goto out;
3129
3130 if (!ipv6_accept_ra(idev))
3131 goto out;
3132
3133 /* Announcement received after solicitation was sent */
3134 if (idev->if_flags & IF_RA_RCVD)
3135 goto out;
3136
3137 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3138 write_unlock(&idev->lock);
3139 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3140 ndisc_send_rs(dev, &lladdr,
3141 &in6addr_linklocal_allrouters);
3142 else
3143 goto put;
3144
3145 write_lock(&idev->lock);
3146 /* The wait after the last probe can be shorter */
3147 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3148 idev->cnf.rtr_solicits) ?
3149 idev->cnf.rtr_solicit_delay :
3150 idev->cnf.rtr_solicit_interval);
3151 } else {
3152 /*
3153 * Note: we do not support deprecated "all on-link"
3154 * assumption any longer.
3155 */
3156 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3157 }
3158
3159 out:
3160 write_unlock(&idev->lock);
3161 put:
3162 in6_dev_put(idev);
3163 }
3164
3165 /*
3166 * Duplicate Address Detection
3167 */
3168 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3169 {
3170 unsigned long rand_num;
3171 struct inet6_dev *idev = ifp->idev;
3172
3173 if (ifp->flags & IFA_F_OPTIMISTIC)
3174 rand_num = 0;
3175 else
3176 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3177
3178 ifp->dad_probes = idev->cnf.dad_transmits;
3179 addrconf_mod_dad_work(ifp, rand_num);
3180 }
3181
3182 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3183 {
3184 struct inet6_dev *idev = ifp->idev;
3185 struct net_device *dev = idev->dev;
3186
3187 addrconf_join_solict(dev, &ifp->addr);
3188
3189 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3190
3191 read_lock_bh(&idev->lock);
3192 spin_lock(&ifp->lock);
3193 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3194 goto out;
3195
3196 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3197 idev->cnf.accept_dad < 1 ||
3198 !(ifp->flags&IFA_F_TENTATIVE) ||
3199 ifp->flags & IFA_F_NODAD) {
3200 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3201 spin_unlock(&ifp->lock);
3202 read_unlock_bh(&idev->lock);
3203
3204 addrconf_dad_completed(ifp);
3205 return;
3206 }
3207
3208 if (!(idev->if_flags & IF_READY)) {
3209 spin_unlock(&ifp->lock);
3210 read_unlock_bh(&idev->lock);
3211 /*
3212 * If the device is not ready:
3213 * - keep it tentative if it is a permanent address.
3214 * - otherwise, kill it.
3215 */
3216 in6_ifa_hold(ifp);
3217 addrconf_dad_stop(ifp, 0);
3218 return;
3219 }
3220
3221 /*
3222 * Optimistic nodes can start receiving
3223 * Frames right away
3224 */
3225 if (ifp->flags & IFA_F_OPTIMISTIC)
3226 ip6_ins_rt(ifp->rt);
3227
3228 addrconf_dad_kick(ifp);
3229 out:
3230 spin_unlock(&ifp->lock);
3231 read_unlock_bh(&idev->lock);
3232 }
3233
3234 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3235 {
3236 bool begin_dad = false;
3237
3238 spin_lock_bh(&ifp->state_lock);
3239 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3240 ifp->state = INET6_IFADDR_STATE_PREDAD;
3241 begin_dad = true;
3242 }
3243 spin_unlock_bh(&ifp->state_lock);
3244
3245 if (begin_dad)
3246 addrconf_mod_dad_work(ifp, 0);
3247 }
3248
3249 static void addrconf_dad_work(struct work_struct *w)
3250 {
3251 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3252 struct inet6_ifaddr,
3253 dad_work);
3254 struct inet6_dev *idev = ifp->idev;
3255 struct in6_addr mcaddr;
3256
3257 enum {
3258 DAD_PROCESS,
3259 DAD_BEGIN,
3260 DAD_ABORT,
3261 } action = DAD_PROCESS;
3262
3263 rtnl_lock();
3264
3265 spin_lock_bh(&ifp->state_lock);
3266 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3267 action = DAD_BEGIN;
3268 ifp->state = INET6_IFADDR_STATE_DAD;
3269 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3270 action = DAD_ABORT;
3271 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3272 }
3273 spin_unlock_bh(&ifp->state_lock);
3274
3275 if (action == DAD_BEGIN) {
3276 addrconf_dad_begin(ifp);
3277 goto out;
3278 } else if (action == DAD_ABORT) {
3279 addrconf_dad_stop(ifp, 1);
3280 goto out;
3281 }
3282
3283 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3284 goto out;
3285
3286 write_lock_bh(&idev->lock);
3287 if (idev->dead || !(idev->if_flags & IF_READY)) {
3288 write_unlock_bh(&idev->lock);
3289 goto out;
3290 }
3291
3292 spin_lock(&ifp->lock);
3293 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3294 spin_unlock(&ifp->lock);
3295 write_unlock_bh(&idev->lock);
3296 goto out;
3297 }
3298
3299 if (ifp->dad_probes == 0) {
3300 /*
3301 * DAD was successful
3302 */
3303
3304 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3305 spin_unlock(&ifp->lock);
3306 write_unlock_bh(&idev->lock);
3307
3308 addrconf_dad_completed(ifp);
3309
3310 goto out;
3311 }
3312
3313 ifp->dad_probes--;
3314 addrconf_mod_dad_work(ifp,
3315 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3316 spin_unlock(&ifp->lock);
3317 write_unlock_bh(&idev->lock);
3318
3319 /* send a neighbour solicitation for our addr */
3320 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3321 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3322 out:
3323 in6_ifa_put(ifp);
3324 rtnl_unlock();
3325 }
3326
3327 /* ifp->idev must be at least read locked */
3328 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3329 {
3330 struct inet6_ifaddr *ifpiter;
3331 struct inet6_dev *idev = ifp->idev;
3332
3333 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3334 if (ifpiter->scope > IFA_LINK)
3335 break;
3336 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3337 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3338 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3339 IFA_F_PERMANENT)
3340 return false;
3341 }
3342 return true;
3343 }
3344
3345 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3346 {
3347 struct net_device *dev = ifp->idev->dev;
3348 struct in6_addr lladdr;
3349 bool send_rs, send_mld;
3350
3351 addrconf_del_dad_work(ifp);
3352
3353 /*
3354 * Configure the address for reception. Now it is valid.
3355 */
3356
3357 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3358
3359 /* If added prefix is link local and we are prepared to process
3360 router advertisements, start sending router solicitations.
3361 */
3362
3363 read_lock_bh(&ifp->idev->lock);
3364 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3365 send_rs = send_mld &&
3366 ipv6_accept_ra(ifp->idev) &&
3367 ifp->idev->cnf.rtr_solicits > 0 &&
3368 (dev->flags&IFF_LOOPBACK) == 0;
3369 read_unlock_bh(&ifp->idev->lock);
3370
3371 /* While dad is in progress mld report's source address is in6_addrany.
3372 * Resend with proper ll now.
3373 */
3374 if (send_mld)
3375 ipv6_mc_dad_complete(ifp->idev);
3376
3377 if (send_rs) {
3378 /*
3379 * If a host as already performed a random delay
3380 * [...] as part of DAD [...] there is no need
3381 * to delay again before sending the first RS
3382 */
3383 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3384 return;
3385 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3386
3387 write_lock_bh(&ifp->idev->lock);
3388 spin_lock(&ifp->lock);
3389 ifp->idev->rs_probes = 1;
3390 ifp->idev->if_flags |= IF_RS_SENT;
3391 addrconf_mod_rs_timer(ifp->idev,
3392 ifp->idev->cnf.rtr_solicit_interval);
3393 spin_unlock(&ifp->lock);
3394 write_unlock_bh(&ifp->idev->lock);
3395 }
3396 }
3397
3398 static void addrconf_dad_run(struct inet6_dev *idev)
3399 {
3400 struct inet6_ifaddr *ifp;
3401
3402 read_lock_bh(&idev->lock);
3403 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3404 spin_lock(&ifp->lock);
3405 if (ifp->flags & IFA_F_TENTATIVE &&
3406 ifp->state == INET6_IFADDR_STATE_DAD)
3407 addrconf_dad_kick(ifp);
3408 spin_unlock(&ifp->lock);
3409 }
3410 read_unlock_bh(&idev->lock);
3411 }
3412
3413 #ifdef CONFIG_PROC_FS
3414 struct if6_iter_state {
3415 struct seq_net_private p;
3416 int bucket;
3417 int offset;
3418 };
3419
3420 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3421 {
3422 struct inet6_ifaddr *ifa = NULL;
3423 struct if6_iter_state *state = seq->private;
3424 struct net *net = seq_file_net(seq);
3425 int p = 0;
3426
3427 /* initial bucket if pos is 0 */
3428 if (pos == 0) {
3429 state->bucket = 0;
3430 state->offset = 0;
3431 }
3432
3433 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3434 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3435 addr_lst) {
3436 if (!net_eq(dev_net(ifa->idev->dev), net))
3437 continue;
3438 /* sync with offset */
3439 if (p < state->offset) {
3440 p++;
3441 continue;
3442 }
3443 state->offset++;
3444 return ifa;
3445 }
3446
3447 /* prepare for next bucket */
3448 state->offset = 0;
3449 p = 0;
3450 }
3451 return NULL;
3452 }
3453
3454 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3455 struct inet6_ifaddr *ifa)
3456 {
3457 struct if6_iter_state *state = seq->private;
3458 struct net *net = seq_file_net(seq);
3459
3460 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3461 if (!net_eq(dev_net(ifa->idev->dev), net))
3462 continue;
3463 state->offset++;
3464 return ifa;
3465 }
3466
3467 while (++state->bucket < IN6_ADDR_HSIZE) {
3468 state->offset = 0;
3469 hlist_for_each_entry_rcu_bh(ifa,
3470 &inet6_addr_lst[state->bucket], addr_lst) {
3471 if (!net_eq(dev_net(ifa->idev->dev), net))
3472 continue;
3473 state->offset++;
3474 return ifa;
3475 }
3476 }
3477
3478 return NULL;
3479 }
3480
3481 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3482 __acquires(rcu_bh)
3483 {
3484 rcu_read_lock_bh();
3485 return if6_get_first(seq, *pos);
3486 }
3487
3488 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3489 {
3490 struct inet6_ifaddr *ifa;
3491
3492 ifa = if6_get_next(seq, v);
3493 ++*pos;
3494 return ifa;
3495 }
3496
3497 static void if6_seq_stop(struct seq_file *seq, void *v)
3498 __releases(rcu_bh)
3499 {
3500 rcu_read_unlock_bh();
3501 }
3502
3503 static int if6_seq_show(struct seq_file *seq, void *v)
3504 {
3505 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3506 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3507 &ifp->addr,
3508 ifp->idev->dev->ifindex,
3509 ifp->prefix_len,
3510 ifp->scope,
3511 (u8) ifp->flags,
3512 ifp->idev->dev->name);
3513 return 0;
3514 }
3515
3516 static const struct seq_operations if6_seq_ops = {
3517 .start = if6_seq_start,
3518 .next = if6_seq_next,
3519 .show = if6_seq_show,
3520 .stop = if6_seq_stop,
3521 };
3522
3523 static int if6_seq_open(struct inode *inode, struct file *file)
3524 {
3525 return seq_open_net(inode, file, &if6_seq_ops,
3526 sizeof(struct if6_iter_state));
3527 }
3528
3529 static const struct file_operations if6_fops = {
3530 .owner = THIS_MODULE,
3531 .open = if6_seq_open,
3532 .read = seq_read,
3533 .llseek = seq_lseek,
3534 .release = seq_release_net,
3535 };
3536
3537 static int __net_init if6_proc_net_init(struct net *net)
3538 {
3539 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3540 return -ENOMEM;
3541 return 0;
3542 }
3543
3544 static void __net_exit if6_proc_net_exit(struct net *net)
3545 {
3546 remove_proc_entry("if_inet6", net->proc_net);
3547 }
3548
3549 static struct pernet_operations if6_proc_net_ops = {
3550 .init = if6_proc_net_init,
3551 .exit = if6_proc_net_exit,
3552 };
3553
3554 int __init if6_proc_init(void)
3555 {
3556 return register_pernet_subsys(&if6_proc_net_ops);
3557 }
3558
3559 void if6_proc_exit(void)
3560 {
3561 unregister_pernet_subsys(&if6_proc_net_ops);
3562 }
3563 #endif /* CONFIG_PROC_FS */
3564
3565 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3566 /* Check if address is a home address configured on any interface. */
3567 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3568 {
3569 int ret = 0;
3570 struct inet6_ifaddr *ifp = NULL;
3571 unsigned int hash = inet6_addr_hash(addr);
3572
3573 rcu_read_lock_bh();
3574 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3575 if (!net_eq(dev_net(ifp->idev->dev), net))
3576 continue;
3577 if (ipv6_addr_equal(&ifp->addr, addr) &&
3578 (ifp->flags & IFA_F_HOMEADDRESS)) {
3579 ret = 1;
3580 break;
3581 }
3582 }
3583 rcu_read_unlock_bh();
3584 return ret;
3585 }
3586 #endif
3587
3588 /*
3589 * Periodic address status verification
3590 */
3591
3592 static void addrconf_verify_rtnl(void)
3593 {
3594 unsigned long now, next, next_sec, next_sched;
3595 struct inet6_ifaddr *ifp;
3596 int i;
3597
3598 ASSERT_RTNL();
3599
3600 rcu_read_lock_bh();
3601 now = jiffies;
3602 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3603
3604 cancel_delayed_work(&addr_chk_work);
3605
3606 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3607 restart:
3608 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3609 unsigned long age;
3610
3611 /* When setting preferred_lft to a value not zero or
3612 * infinity, while valid_lft is infinity
3613 * IFA_F_PERMANENT has a non-infinity life time.
3614 */
3615 if ((ifp->flags & IFA_F_PERMANENT) &&
3616 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3617 continue;
3618
3619 spin_lock(&ifp->lock);
3620 /* We try to batch several events at once. */
3621 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3622
3623 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3624 age >= ifp->valid_lft) {
3625 spin_unlock(&ifp->lock);
3626 in6_ifa_hold(ifp);
3627 ipv6_del_addr(ifp);
3628 goto restart;
3629 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3630 spin_unlock(&ifp->lock);
3631 continue;
3632 } else if (age >= ifp->prefered_lft) {
3633 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3634 int deprecate = 0;
3635
3636 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3637 deprecate = 1;
3638 ifp->flags |= IFA_F_DEPRECATED;
3639 }
3640
3641 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3642 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3643 next = ifp->tstamp + ifp->valid_lft * HZ;
3644
3645 spin_unlock(&ifp->lock);
3646
3647 if (deprecate) {
3648 in6_ifa_hold(ifp);
3649
3650 ipv6_ifa_notify(0, ifp);
3651 in6_ifa_put(ifp);
3652 goto restart;
3653 }
3654 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3655 !(ifp->flags&IFA_F_TENTATIVE)) {
3656 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3657 ifp->idev->cnf.dad_transmits *
3658 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3659
3660 if (age >= ifp->prefered_lft - regen_advance) {
3661 struct inet6_ifaddr *ifpub = ifp->ifpub;
3662 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3663 next = ifp->tstamp + ifp->prefered_lft * HZ;
3664 if (!ifp->regen_count && ifpub) {
3665 ifp->regen_count++;
3666 in6_ifa_hold(ifp);
3667 in6_ifa_hold(ifpub);
3668 spin_unlock(&ifp->lock);
3669
3670 spin_lock(&ifpub->lock);
3671 ifpub->regen_count = 0;
3672 spin_unlock(&ifpub->lock);
3673 ipv6_create_tempaddr(ifpub, ifp);
3674 in6_ifa_put(ifpub);
3675 in6_ifa_put(ifp);
3676 goto restart;
3677 }
3678 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3679 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3680 spin_unlock(&ifp->lock);
3681 } else {
3682 /* ifp->prefered_lft <= ifp->valid_lft */
3683 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3684 next = ifp->tstamp + ifp->prefered_lft * HZ;
3685 spin_unlock(&ifp->lock);
3686 }
3687 }
3688 }
3689
3690 next_sec = round_jiffies_up(next);
3691 next_sched = next;
3692
3693 /* If rounded timeout is accurate enough, accept it. */
3694 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3695 next_sched = next_sec;
3696
3697 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3698 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3699 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3700
3701 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3702 now, next, next_sec, next_sched);
3703 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
3704 rcu_read_unlock_bh();
3705 }
3706
3707 static void addrconf_verify_work(struct work_struct *w)
3708 {
3709 rtnl_lock();
3710 addrconf_verify_rtnl();
3711 rtnl_unlock();
3712 }
3713
3714 static void addrconf_verify(void)
3715 {
3716 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3717 }
3718
3719 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3720 struct in6_addr **peer_pfx)
3721 {
3722 struct in6_addr *pfx = NULL;
3723
3724 *peer_pfx = NULL;
3725
3726 if (addr)
3727 pfx = nla_data(addr);
3728
3729 if (local) {
3730 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3731 *peer_pfx = pfx;
3732 pfx = nla_data(local);
3733 }
3734
3735 return pfx;
3736 }
3737
3738 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3739 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3740 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3741 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3742 [IFA_FLAGS] = { .len = sizeof(u32) },
3743 };
3744
3745 static int
3746 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3747 {
3748 struct net *net = sock_net(skb->sk);
3749 struct ifaddrmsg *ifm;
3750 struct nlattr *tb[IFA_MAX+1];
3751 struct in6_addr *pfx, *peer_pfx;
3752 u32 ifa_flags;
3753 int err;
3754
3755 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3756 if (err < 0)
3757 return err;
3758
3759 ifm = nlmsg_data(nlh);
3760 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3761 if (pfx == NULL)
3762 return -EINVAL;
3763
3764 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3765
3766 /* We ignore other flags so far. */
3767 ifa_flags &= IFA_F_MANAGETEMPADDR;
3768
3769 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
3770 ifm->ifa_prefixlen);
3771 }
3772
3773 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
3774 u32 prefered_lft, u32 valid_lft)
3775 {
3776 u32 flags;
3777 clock_t expires;
3778 unsigned long timeout;
3779 bool was_managetempaddr;
3780 bool had_prefixroute;
3781
3782 ASSERT_RTNL();
3783
3784 if (!valid_lft || (prefered_lft > valid_lft))
3785 return -EINVAL;
3786
3787 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3788 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3789 return -EINVAL;
3790
3791 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3792 if (addrconf_finite_timeout(timeout)) {
3793 expires = jiffies_to_clock_t(timeout * HZ);
3794 valid_lft = timeout;
3795 flags = RTF_EXPIRES;
3796 } else {
3797 expires = 0;
3798 flags = 0;
3799 ifa_flags |= IFA_F_PERMANENT;
3800 }
3801
3802 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3803 if (addrconf_finite_timeout(timeout)) {
3804 if (timeout == 0)
3805 ifa_flags |= IFA_F_DEPRECATED;
3806 prefered_lft = timeout;
3807 }
3808
3809 spin_lock_bh(&ifp->lock);
3810 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
3811 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
3812 !(ifp->flags & IFA_F_NOPREFIXROUTE);
3813 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
3814 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3815 IFA_F_NOPREFIXROUTE);
3816 ifp->flags |= ifa_flags;
3817 ifp->tstamp = jiffies;
3818 ifp->valid_lft = valid_lft;
3819 ifp->prefered_lft = prefered_lft;
3820
3821 spin_unlock_bh(&ifp->lock);
3822 if (!(ifp->flags&IFA_F_TENTATIVE))
3823 ipv6_ifa_notify(0, ifp);
3824
3825 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
3826 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3827 expires, flags);
3828 } else if (had_prefixroute) {
3829 enum cleanup_prefix_rt_t action;
3830 unsigned long rt_expires;
3831
3832 write_lock_bh(&ifp->idev->lock);
3833 action = check_cleanup_prefix_route(ifp, &rt_expires);
3834 write_unlock_bh(&ifp->idev->lock);
3835
3836 if (action != CLEANUP_PREFIX_RT_NOP) {
3837 cleanup_prefix_route(ifp, rt_expires,
3838 action == CLEANUP_PREFIX_RT_DEL);
3839 }
3840 }
3841
3842 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3843 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3844 valid_lft = prefered_lft = 0;
3845 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3846 !was_managetempaddr, jiffies);
3847 }
3848
3849 addrconf_verify_rtnl();
3850
3851 return 0;
3852 }
3853
3854 static int
3855 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3856 {
3857 struct net *net = sock_net(skb->sk);
3858 struct ifaddrmsg *ifm;
3859 struct nlattr *tb[IFA_MAX+1];
3860 struct in6_addr *pfx, *peer_pfx;
3861 struct inet6_ifaddr *ifa;
3862 struct net_device *dev;
3863 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3864 u32 ifa_flags;
3865 int err;
3866
3867 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3868 if (err < 0)
3869 return err;
3870
3871 ifm = nlmsg_data(nlh);
3872 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3873 if (pfx == NULL)
3874 return -EINVAL;
3875
3876 if (tb[IFA_CACHEINFO]) {
3877 struct ifa_cacheinfo *ci;
3878
3879 ci = nla_data(tb[IFA_CACHEINFO]);
3880 valid_lft = ci->ifa_valid;
3881 preferred_lft = ci->ifa_prefered;
3882 } else {
3883 preferred_lft = INFINITY_LIFE_TIME;
3884 valid_lft = INFINITY_LIFE_TIME;
3885 }
3886
3887 dev = __dev_get_by_index(net, ifm->ifa_index);
3888 if (dev == NULL)
3889 return -ENODEV;
3890
3891 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3892
3893 /* We ignore other flags so far. */
3894 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3895 IFA_F_NOPREFIXROUTE;
3896
3897 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3898 if (ifa == NULL) {
3899 /*
3900 * It would be best to check for !NLM_F_CREATE here but
3901 * userspace already relies on not having to provide this.
3902 */
3903 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3904 ifm->ifa_prefixlen, ifa_flags,
3905 preferred_lft, valid_lft);
3906 }
3907
3908 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3909 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3910 err = -EEXIST;
3911 else
3912 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3913
3914 in6_ifa_put(ifa);
3915
3916 return err;
3917 }
3918
3919 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
3920 u8 scope, int ifindex)
3921 {
3922 struct ifaddrmsg *ifm;
3923
3924 ifm = nlmsg_data(nlh);
3925 ifm->ifa_family = AF_INET6;
3926 ifm->ifa_prefixlen = prefixlen;
3927 ifm->ifa_flags = flags;
3928 ifm->ifa_scope = scope;
3929 ifm->ifa_index = ifindex;
3930 }
3931
3932 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3933 unsigned long tstamp, u32 preferred, u32 valid)
3934 {
3935 struct ifa_cacheinfo ci;
3936
3937 ci.cstamp = cstamp_delta(cstamp);
3938 ci.tstamp = cstamp_delta(tstamp);
3939 ci.ifa_prefered = preferred;
3940 ci.ifa_valid = valid;
3941
3942 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3943 }
3944
3945 static inline int rt_scope(int ifa_scope)
3946 {
3947 if (ifa_scope & IFA_HOST)
3948 return RT_SCOPE_HOST;
3949 else if (ifa_scope & IFA_LINK)
3950 return RT_SCOPE_LINK;
3951 else if (ifa_scope & IFA_SITE)
3952 return RT_SCOPE_SITE;
3953 else
3954 return RT_SCOPE_UNIVERSE;
3955 }
3956
3957 static inline int inet6_ifaddr_msgsize(void)
3958 {
3959 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3960 + nla_total_size(16) /* IFA_LOCAL */
3961 + nla_total_size(16) /* IFA_ADDRESS */
3962 + nla_total_size(sizeof(struct ifa_cacheinfo))
3963 + nla_total_size(4) /* IFA_FLAGS */;
3964 }
3965
3966 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3967 u32 portid, u32 seq, int event, unsigned int flags)
3968 {
3969 struct nlmsghdr *nlh;
3970 u32 preferred, valid;
3971
3972 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3973 if (nlh == NULL)
3974 return -EMSGSIZE;
3975
3976 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3977 ifa->idev->dev->ifindex);
3978
3979 if (!((ifa->flags&IFA_F_PERMANENT) &&
3980 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
3981 preferred = ifa->prefered_lft;
3982 valid = ifa->valid_lft;
3983 if (preferred != INFINITY_LIFE_TIME) {
3984 long tval = (jiffies - ifa->tstamp)/HZ;
3985 if (preferred > tval)
3986 preferred -= tval;
3987 else
3988 preferred = 0;
3989 if (valid != INFINITY_LIFE_TIME) {
3990 if (valid > tval)
3991 valid -= tval;
3992 else
3993 valid = 0;
3994 }
3995 }
3996 } else {
3997 preferred = INFINITY_LIFE_TIME;
3998 valid = INFINITY_LIFE_TIME;
3999 }
4000
4001 if (!ipv6_addr_any(&ifa->peer_addr)) {
4002 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
4003 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
4004 goto error;
4005 } else
4006 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
4007 goto error;
4008
4009 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4010 goto error;
4011
4012 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4013 goto error;
4014
4015 return nlmsg_end(skb, nlh);
4016
4017 error:
4018 nlmsg_cancel(skb, nlh);
4019 return -EMSGSIZE;
4020 }
4021
4022 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4023 u32 portid, u32 seq, int event, u16 flags)
4024 {
4025 struct nlmsghdr *nlh;
4026 u8 scope = RT_SCOPE_UNIVERSE;
4027 int ifindex = ifmca->idev->dev->ifindex;
4028
4029 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4030 scope = RT_SCOPE_SITE;
4031
4032 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4033 if (nlh == NULL)
4034 return -EMSGSIZE;
4035
4036 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4037 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
4038 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4039 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4040 nlmsg_cancel(skb, nlh);
4041 return -EMSGSIZE;
4042 }
4043
4044 return nlmsg_end(skb, nlh);
4045 }
4046
4047 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4048 u32 portid, u32 seq, int event, unsigned int flags)
4049 {
4050 struct nlmsghdr *nlh;
4051 u8 scope = RT_SCOPE_UNIVERSE;
4052 int ifindex = ifaca->aca_idev->dev->ifindex;
4053
4054 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4055 scope = RT_SCOPE_SITE;
4056
4057 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4058 if (nlh == NULL)
4059 return -EMSGSIZE;
4060
4061 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4062 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
4063 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4064 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4065 nlmsg_cancel(skb, nlh);
4066 return -EMSGSIZE;
4067 }
4068
4069 return nlmsg_end(skb, nlh);
4070 }
4071
4072 enum addr_type_t {
4073 UNICAST_ADDR,
4074 MULTICAST_ADDR,
4075 ANYCAST_ADDR,
4076 };
4077
4078 /* called with rcu_read_lock() */
4079 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4080 struct netlink_callback *cb, enum addr_type_t type,
4081 int s_ip_idx, int *p_ip_idx)
4082 {
4083 struct ifmcaddr6 *ifmca;
4084 struct ifacaddr6 *ifaca;
4085 int err = 1;
4086 int ip_idx = *p_ip_idx;
4087
4088 read_lock_bh(&idev->lock);
4089 switch (type) {
4090 case UNICAST_ADDR: {
4091 struct inet6_ifaddr *ifa;
4092
4093 /* unicast address incl. temp addr */
4094 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4095 if (++ip_idx < s_ip_idx)
4096 continue;
4097 err = inet6_fill_ifaddr(skb, ifa,
4098 NETLINK_CB(cb->skb).portid,
4099 cb->nlh->nlmsg_seq,
4100 RTM_NEWADDR,
4101 NLM_F_MULTI);
4102 if (err <= 0)
4103 break;
4104 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4105 }
4106 break;
4107 }
4108 case MULTICAST_ADDR:
4109 /* multicast address */
4110 for (ifmca = idev->mc_list; ifmca;
4111 ifmca = ifmca->next, ip_idx++) {
4112 if (ip_idx < s_ip_idx)
4113 continue;
4114 err = inet6_fill_ifmcaddr(skb, ifmca,
4115 NETLINK_CB(cb->skb).portid,
4116 cb->nlh->nlmsg_seq,
4117 RTM_GETMULTICAST,
4118 NLM_F_MULTI);
4119 if (err <= 0)
4120 break;
4121 }
4122 break;
4123 case ANYCAST_ADDR:
4124 /* anycast address */
4125 for (ifaca = idev->ac_list; ifaca;
4126 ifaca = ifaca->aca_next, ip_idx++) {
4127 if (ip_idx < s_ip_idx)
4128 continue;
4129 err = inet6_fill_ifacaddr(skb, ifaca,
4130 NETLINK_CB(cb->skb).portid,
4131 cb->nlh->nlmsg_seq,
4132 RTM_GETANYCAST,
4133 NLM_F_MULTI);
4134 if (err <= 0)
4135 break;
4136 }
4137 break;
4138 default:
4139 break;
4140 }
4141 read_unlock_bh(&idev->lock);
4142 *p_ip_idx = ip_idx;
4143 return err;
4144 }
4145
4146 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4147 enum addr_type_t type)
4148 {
4149 struct net *net = sock_net(skb->sk);
4150 int h, s_h;
4151 int idx, ip_idx;
4152 int s_idx, s_ip_idx;
4153 struct net_device *dev;
4154 struct inet6_dev *idev;
4155 struct hlist_head *head;
4156
4157 s_h = cb->args[0];
4158 s_idx = idx = cb->args[1];
4159 s_ip_idx = ip_idx = cb->args[2];
4160
4161 rcu_read_lock();
4162 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4163 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4164 idx = 0;
4165 head = &net->dev_index_head[h];
4166 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4167 if (idx < s_idx)
4168 goto cont;
4169 if (h > s_h || idx > s_idx)
4170 s_ip_idx = 0;
4171 ip_idx = 0;
4172 idev = __in6_dev_get(dev);
4173 if (!idev)
4174 goto cont;
4175
4176 if (in6_dump_addrs(idev, skb, cb, type,
4177 s_ip_idx, &ip_idx) <= 0)
4178 goto done;
4179 cont:
4180 idx++;
4181 }
4182 }
4183 done:
4184 rcu_read_unlock();
4185 cb->args[0] = h;
4186 cb->args[1] = idx;
4187 cb->args[2] = ip_idx;
4188
4189 return skb->len;
4190 }
4191
4192 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4193 {
4194 enum addr_type_t type = UNICAST_ADDR;
4195
4196 return inet6_dump_addr(skb, cb, type);
4197 }
4198
4199 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4200 {
4201 enum addr_type_t type = MULTICAST_ADDR;
4202
4203 return inet6_dump_addr(skb, cb, type);
4204 }
4205
4206
4207 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4208 {
4209 enum addr_type_t type = ANYCAST_ADDR;
4210
4211 return inet6_dump_addr(skb, cb, type);
4212 }
4213
4214 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4215 {
4216 struct net *net = sock_net(in_skb->sk);
4217 struct ifaddrmsg *ifm;
4218 struct nlattr *tb[IFA_MAX+1];
4219 struct in6_addr *addr = NULL, *peer;
4220 struct net_device *dev = NULL;
4221 struct inet6_ifaddr *ifa;
4222 struct sk_buff *skb;
4223 int err;
4224
4225 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4226 if (err < 0)
4227 goto errout;
4228
4229 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4230 if (addr == NULL) {
4231 err = -EINVAL;
4232 goto errout;
4233 }
4234
4235 ifm = nlmsg_data(nlh);
4236 if (ifm->ifa_index)
4237 dev = __dev_get_by_index(net, ifm->ifa_index);
4238
4239 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4240 if (!ifa) {
4241 err = -EADDRNOTAVAIL;
4242 goto errout;
4243 }
4244
4245 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4246 if (!skb) {
4247 err = -ENOBUFS;
4248 goto errout_ifa;
4249 }
4250
4251 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4252 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4253 if (err < 0) {
4254 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4255 WARN_ON(err == -EMSGSIZE);
4256 kfree_skb(skb);
4257 goto errout_ifa;
4258 }
4259 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4260 errout_ifa:
4261 in6_ifa_put(ifa);
4262 errout:
4263 return err;
4264 }
4265
4266 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4267 {
4268 struct sk_buff *skb;
4269 struct net *net = dev_net(ifa->idev->dev);
4270 int err = -ENOBUFS;
4271
4272 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4273 if (skb == NULL)
4274 goto errout;
4275
4276 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4277 if (err < 0) {
4278 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4279 WARN_ON(err == -EMSGSIZE);
4280 kfree_skb(skb);
4281 goto errout;
4282 }
4283 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4284 return;
4285 errout:
4286 if (err < 0)
4287 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4288 }
4289
4290 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4291 __s32 *array, int bytes)
4292 {
4293 BUG_ON(bytes < (DEVCONF_MAX * 4));
4294
4295 memset(array, 0, bytes);
4296 array[DEVCONF_FORWARDING] = cnf->forwarding;
4297 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4298 array[DEVCONF_MTU6] = cnf->mtu6;
4299 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4300 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4301 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4302 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4303 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4304 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4305 jiffies_to_msecs(cnf->rtr_solicit_interval);
4306 array[DEVCONF_RTR_SOLICIT_DELAY] =
4307 jiffies_to_msecs(cnf->rtr_solicit_delay);
4308 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4309 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4310 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4311 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4312 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4313 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4314 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4315 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4316 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4317 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4318 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4319 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4320 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4321 #ifdef CONFIG_IPV6_ROUTER_PREF
4322 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4323 array[DEVCONF_RTR_PROBE_INTERVAL] =
4324 jiffies_to_msecs(cnf->rtr_probe_interval);
4325 #ifdef CONFIG_IPV6_ROUTE_INFO
4326 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4327 #endif
4328 #endif
4329 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4330 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4331 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4332 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4333 #endif
4334 #ifdef CONFIG_IPV6_MROUTE
4335 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4336 #endif
4337 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4338 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4339 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4340 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4341 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4342 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4343 }
4344
4345 static inline size_t inet6_ifla6_size(void)
4346 {
4347 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4348 + nla_total_size(sizeof(struct ifla_cacheinfo))
4349 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4350 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4351 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4352 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4353 }
4354
4355 static inline size_t inet6_if_nlmsg_size(void)
4356 {
4357 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4358 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4359 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4360 + nla_total_size(4) /* IFLA_MTU */
4361 + nla_total_size(4) /* IFLA_LINK */
4362 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4363 }
4364
4365 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4366 int items, int bytes)
4367 {
4368 int i;
4369 int pad = bytes - sizeof(u64) * items;
4370 BUG_ON(pad < 0);
4371
4372 /* Use put_unaligned() because stats may not be aligned for u64. */
4373 put_unaligned(items, &stats[0]);
4374 for (i = 1; i < items; i++)
4375 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4376
4377 memset(&stats[items], 0, pad);
4378 }
4379
4380 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4381 int items, int bytes, size_t syncpoff)
4382 {
4383 int i;
4384 int pad = bytes - sizeof(u64) * items;
4385 BUG_ON(pad < 0);
4386
4387 /* Use put_unaligned() because stats may not be aligned for u64. */
4388 put_unaligned(items, &stats[0]);
4389 for (i = 1; i < items; i++)
4390 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4391
4392 memset(&stats[items], 0, pad);
4393 }
4394
4395 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4396 int bytes)
4397 {
4398 switch (attrtype) {
4399 case IFLA_INET6_STATS:
4400 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4401 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4402 break;
4403 case IFLA_INET6_ICMP6STATS:
4404 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4405 break;
4406 }
4407 }
4408
4409 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4410 {
4411 struct nlattr *nla;
4412 struct ifla_cacheinfo ci;
4413
4414 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4415 goto nla_put_failure;
4416 ci.max_reasm_len = IPV6_MAXPLEN;
4417 ci.tstamp = cstamp_delta(idev->tstamp);
4418 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4419 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4420 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4421 goto nla_put_failure;
4422 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4423 if (nla == NULL)
4424 goto nla_put_failure;
4425 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4426
4427 /* XXX - MC not implemented */
4428
4429 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4430 if (nla == NULL)
4431 goto nla_put_failure;
4432 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4433
4434 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4435 if (nla == NULL)
4436 goto nla_put_failure;
4437 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4438
4439 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4440 if (nla == NULL)
4441 goto nla_put_failure;
4442
4443 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4444 goto nla_put_failure;
4445
4446 read_lock_bh(&idev->lock);
4447 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4448 read_unlock_bh(&idev->lock);
4449
4450 return 0;
4451
4452 nla_put_failure:
4453 return -EMSGSIZE;
4454 }
4455
4456 static size_t inet6_get_link_af_size(const struct net_device *dev)
4457 {
4458 if (!__in6_dev_get(dev))
4459 return 0;
4460
4461 return inet6_ifla6_size();
4462 }
4463
4464 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4465 {
4466 struct inet6_dev *idev = __in6_dev_get(dev);
4467
4468 if (!idev)
4469 return -ENODATA;
4470
4471 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4472 return -EMSGSIZE;
4473
4474 return 0;
4475 }
4476
4477 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4478 {
4479 struct inet6_ifaddr *ifp;
4480 struct net_device *dev = idev->dev;
4481 bool update_rs = false;
4482 struct in6_addr ll_addr;
4483
4484 ASSERT_RTNL();
4485
4486 if (token == NULL)
4487 return -EINVAL;
4488 if (ipv6_addr_any(token))
4489 return -EINVAL;
4490 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4491 return -EINVAL;
4492 if (!ipv6_accept_ra(idev))
4493 return -EINVAL;
4494 if (idev->cnf.rtr_solicits <= 0)
4495 return -EINVAL;
4496
4497 write_lock_bh(&idev->lock);
4498
4499 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4500 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4501
4502 write_unlock_bh(&idev->lock);
4503
4504 if (!idev->dead && (idev->if_flags & IF_READY) &&
4505 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4506 IFA_F_OPTIMISTIC)) {
4507
4508 /* If we're not ready, then normal ifup will take care
4509 * of this. Otherwise, we need to request our rs here.
4510 */
4511 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4512 update_rs = true;
4513 }
4514
4515 write_lock_bh(&idev->lock);
4516
4517 if (update_rs) {
4518 idev->if_flags |= IF_RS_SENT;
4519 idev->rs_probes = 1;
4520 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4521 }
4522
4523 /* Well, that's kinda nasty ... */
4524 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4525 spin_lock(&ifp->lock);
4526 if (ifp->tokenized) {
4527 ifp->valid_lft = 0;
4528 ifp->prefered_lft = 0;
4529 }
4530 spin_unlock(&ifp->lock);
4531 }
4532
4533 write_unlock_bh(&idev->lock);
4534 addrconf_verify_rtnl();
4535 return 0;
4536 }
4537
4538 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4539 {
4540 int err = -EINVAL;
4541 struct inet6_dev *idev = __in6_dev_get(dev);
4542 struct nlattr *tb[IFLA_INET6_MAX + 1];
4543
4544 if (!idev)
4545 return -EAFNOSUPPORT;
4546
4547 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4548 BUG();
4549
4550 if (tb[IFLA_INET6_TOKEN]) {
4551 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4552 if (err)
4553 return err;
4554 }
4555
4556 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4557 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4558
4559 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4560 mode != IN6_ADDR_GEN_MODE_NONE)
4561 return -EINVAL;
4562 idev->addr_gen_mode = mode;
4563 err = 0;
4564 }
4565
4566 return err;
4567 }
4568
4569 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4570 u32 portid, u32 seq, int event, unsigned int flags)
4571 {
4572 struct net_device *dev = idev->dev;
4573 struct ifinfomsg *hdr;
4574 struct nlmsghdr *nlh;
4575 void *protoinfo;
4576
4577 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4578 if (nlh == NULL)
4579 return -EMSGSIZE;
4580
4581 hdr = nlmsg_data(nlh);
4582 hdr->ifi_family = AF_INET6;
4583 hdr->__ifi_pad = 0;
4584 hdr->ifi_type = dev->type;
4585 hdr->ifi_index = dev->ifindex;
4586 hdr->ifi_flags = dev_get_flags(dev);
4587 hdr->ifi_change = 0;
4588
4589 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4590 (dev->addr_len &&
4591 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4592 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4593 (dev->ifindex != dev->iflink &&
4594 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4595 goto nla_put_failure;
4596 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4597 if (protoinfo == NULL)
4598 goto nla_put_failure;
4599
4600 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4601 goto nla_put_failure;
4602
4603 nla_nest_end(skb, protoinfo);
4604 return nlmsg_end(skb, nlh);
4605
4606 nla_put_failure:
4607 nlmsg_cancel(skb, nlh);
4608 return -EMSGSIZE;
4609 }
4610
4611 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4612 {
4613 struct net *net = sock_net(skb->sk);
4614 int h, s_h;
4615 int idx = 0, s_idx;
4616 struct net_device *dev;
4617 struct inet6_dev *idev;
4618 struct hlist_head *head;
4619
4620 s_h = cb->args[0];
4621 s_idx = cb->args[1];
4622
4623 rcu_read_lock();
4624 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4625 idx = 0;
4626 head = &net->dev_index_head[h];
4627 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4628 if (idx < s_idx)
4629 goto cont;
4630 idev = __in6_dev_get(dev);
4631 if (!idev)
4632 goto cont;
4633 if (inet6_fill_ifinfo(skb, idev,
4634 NETLINK_CB(cb->skb).portid,
4635 cb->nlh->nlmsg_seq,
4636 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4637 goto out;
4638 cont:
4639 idx++;
4640 }
4641 }
4642 out:
4643 rcu_read_unlock();
4644 cb->args[1] = idx;
4645 cb->args[0] = h;
4646
4647 return skb->len;
4648 }
4649
4650 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4651 {
4652 struct sk_buff *skb;
4653 struct net *net = dev_net(idev->dev);
4654 int err = -ENOBUFS;
4655
4656 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4657 if (skb == NULL)
4658 goto errout;
4659
4660 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4661 if (err < 0) {
4662 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4663 WARN_ON(err == -EMSGSIZE);
4664 kfree_skb(skb);
4665 goto errout;
4666 }
4667 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4668 return;
4669 errout:
4670 if (err < 0)
4671 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4672 }
4673
4674 static inline size_t inet6_prefix_nlmsg_size(void)
4675 {
4676 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4677 + nla_total_size(sizeof(struct in6_addr))
4678 + nla_total_size(sizeof(struct prefix_cacheinfo));
4679 }
4680
4681 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4682 struct prefix_info *pinfo, u32 portid, u32 seq,
4683 int event, unsigned int flags)
4684 {
4685 struct prefixmsg *pmsg;
4686 struct nlmsghdr *nlh;
4687 struct prefix_cacheinfo ci;
4688
4689 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4690 if (nlh == NULL)
4691 return -EMSGSIZE;
4692
4693 pmsg = nlmsg_data(nlh);
4694 pmsg->prefix_family = AF_INET6;
4695 pmsg->prefix_pad1 = 0;
4696 pmsg->prefix_pad2 = 0;
4697 pmsg->prefix_ifindex = idev->dev->ifindex;
4698 pmsg->prefix_len = pinfo->prefix_len;
4699 pmsg->prefix_type = pinfo->type;
4700 pmsg->prefix_pad3 = 0;
4701 pmsg->prefix_flags = 0;
4702 if (pinfo->onlink)
4703 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4704 if (pinfo->autoconf)
4705 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4706
4707 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4708 goto nla_put_failure;
4709 ci.preferred_time = ntohl(pinfo->prefered);
4710 ci.valid_time = ntohl(pinfo->valid);
4711 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4712 goto nla_put_failure;
4713 return nlmsg_end(skb, nlh);
4714
4715 nla_put_failure:
4716 nlmsg_cancel(skb, nlh);
4717 return -EMSGSIZE;
4718 }
4719
4720 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4721 struct prefix_info *pinfo)
4722 {
4723 struct sk_buff *skb;
4724 struct net *net = dev_net(idev->dev);
4725 int err = -ENOBUFS;
4726
4727 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4728 if (skb == NULL)
4729 goto errout;
4730
4731 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4732 if (err < 0) {
4733 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4734 WARN_ON(err == -EMSGSIZE);
4735 kfree_skb(skb);
4736 goto errout;
4737 }
4738 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4739 return;
4740 errout:
4741 if (err < 0)
4742 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4743 }
4744
4745 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4746 {
4747 struct net *net = dev_net(ifp->idev->dev);
4748
4749 if (event)
4750 ASSERT_RTNL();
4751
4752 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4753
4754 switch (event) {
4755 case RTM_NEWADDR:
4756 /*
4757 * If the address was optimistic
4758 * we inserted the route at the start of
4759 * our DAD process, so we don't need
4760 * to do it again
4761 */
4762 if (!(ifp->rt->rt6i_node))
4763 ip6_ins_rt(ifp->rt);
4764 if (ifp->idev->cnf.forwarding)
4765 addrconf_join_anycast(ifp);
4766 if (!ipv6_addr_any(&ifp->peer_addr))
4767 addrconf_prefix_route(&ifp->peer_addr, 128,
4768 ifp->idev->dev, 0, 0);
4769 break;
4770 case RTM_DELADDR:
4771 if (ifp->idev->cnf.forwarding)
4772 addrconf_leave_anycast(ifp);
4773 addrconf_leave_solict(ifp->idev, &ifp->addr);
4774 if (!ipv6_addr_any(&ifp->peer_addr)) {
4775 struct rt6_info *rt;
4776
4777 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
4778 ifp->idev->dev, 0, 0);
4779 if (rt && ip6_del_rt(rt))
4780 dst_free(&rt->dst);
4781 }
4782 dst_hold(&ifp->rt->dst);
4783
4784 if (ip6_del_rt(ifp->rt))
4785 dst_free(&ifp->rt->dst);
4786
4787 rt_genid_bump_ipv6(net);
4788 break;
4789 }
4790 atomic_inc(&net->ipv6.dev_addr_genid);
4791 }
4792
4793 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4794 {
4795 rcu_read_lock_bh();
4796 if (likely(ifp->idev->dead == 0))
4797 __ipv6_ifa_notify(event, ifp);
4798 rcu_read_unlock_bh();
4799 }
4800
4801 #ifdef CONFIG_SYSCTL
4802
4803 static
4804 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4805 void __user *buffer, size_t *lenp, loff_t *ppos)
4806 {
4807 int *valp = ctl->data;
4808 int val = *valp;
4809 loff_t pos = *ppos;
4810 struct ctl_table lctl;
4811 int ret;
4812
4813 /*
4814 * ctl->data points to idev->cnf.forwarding, we should
4815 * not modify it until we get the rtnl lock.
4816 */
4817 lctl = *ctl;
4818 lctl.data = &val;
4819
4820 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4821
4822 if (write)
4823 ret = addrconf_fixup_forwarding(ctl, valp, val);
4824 if (ret)
4825 *ppos = pos;
4826 return ret;
4827 }
4828
4829 static void dev_disable_change(struct inet6_dev *idev)
4830 {
4831 struct netdev_notifier_info info;
4832
4833 if (!idev || !idev->dev)
4834 return;
4835
4836 netdev_notifier_info_init(&info, idev->dev);
4837 if (idev->cnf.disable_ipv6)
4838 addrconf_notify(NULL, NETDEV_DOWN, &info);
4839 else
4840 addrconf_notify(NULL, NETDEV_UP, &info);
4841 }
4842
4843 static void addrconf_disable_change(struct net *net, __s32 newf)
4844 {
4845 struct net_device *dev;
4846 struct inet6_dev *idev;
4847
4848 rcu_read_lock();
4849 for_each_netdev_rcu(net, dev) {
4850 idev = __in6_dev_get(dev);
4851 if (idev) {
4852 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4853 idev->cnf.disable_ipv6 = newf;
4854 if (changed)
4855 dev_disable_change(idev);
4856 }
4857 }
4858 rcu_read_unlock();
4859 }
4860
4861 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4862 {
4863 struct net *net;
4864 int old;
4865
4866 if (!rtnl_trylock())
4867 return restart_syscall();
4868
4869 net = (struct net *)table->extra2;
4870 old = *p;
4871 *p = newf;
4872
4873 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4874 rtnl_unlock();
4875 return 0;
4876 }
4877
4878 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4879 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4880 addrconf_disable_change(net, newf);
4881 } else if ((!newf) ^ (!old))
4882 dev_disable_change((struct inet6_dev *)table->extra1);
4883
4884 rtnl_unlock();
4885 return 0;
4886 }
4887
4888 static
4889 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4890 void __user *buffer, size_t *lenp, loff_t *ppos)
4891 {
4892 int *valp = ctl->data;
4893 int val = *valp;
4894 loff_t pos = *ppos;
4895 struct ctl_table lctl;
4896 int ret;
4897
4898 /*
4899 * ctl->data points to idev->cnf.disable_ipv6, we should
4900 * not modify it until we get the rtnl lock.
4901 */
4902 lctl = *ctl;
4903 lctl.data = &val;
4904
4905 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4906
4907 if (write)
4908 ret = addrconf_disable_ipv6(ctl, valp, val);
4909 if (ret)
4910 *ppos = pos;
4911 return ret;
4912 }
4913
4914 static
4915 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
4916 void __user *buffer, size_t *lenp, loff_t *ppos)
4917 {
4918 int *valp = ctl->data;
4919 int ret;
4920 int old, new;
4921
4922 old = *valp;
4923 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4924 new = *valp;
4925
4926 if (write && old != new) {
4927 struct net *net = ctl->extra2;
4928
4929 if (!rtnl_trylock())
4930 return restart_syscall();
4931
4932 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
4933 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4934 NETCONFA_IFINDEX_DEFAULT,
4935 net->ipv6.devconf_dflt);
4936 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
4937 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4938 NETCONFA_IFINDEX_ALL,
4939 net->ipv6.devconf_all);
4940 else {
4941 struct inet6_dev *idev = ctl->extra1;
4942
4943 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4944 idev->dev->ifindex,
4945 &idev->cnf);
4946 }
4947 rtnl_unlock();
4948 }
4949
4950 return ret;
4951 }
4952
4953
4954 static struct addrconf_sysctl_table
4955 {
4956 struct ctl_table_header *sysctl_header;
4957 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4958 } addrconf_sysctl __read_mostly = {
4959 .sysctl_header = NULL,
4960 .addrconf_vars = {
4961 {
4962 .procname = "forwarding",
4963 .data = &ipv6_devconf.forwarding,
4964 .maxlen = sizeof(int),
4965 .mode = 0644,
4966 .proc_handler = addrconf_sysctl_forward,
4967 },
4968 {
4969 .procname = "hop_limit",
4970 .data = &ipv6_devconf.hop_limit,
4971 .maxlen = sizeof(int),
4972 .mode = 0644,
4973 .proc_handler = proc_dointvec,
4974 },
4975 {
4976 .procname = "mtu",
4977 .data = &ipv6_devconf.mtu6,
4978 .maxlen = sizeof(int),
4979 .mode = 0644,
4980 .proc_handler = proc_dointvec,
4981 },
4982 {
4983 .procname = "accept_ra",
4984 .data = &ipv6_devconf.accept_ra,
4985 .maxlen = sizeof(int),
4986 .mode = 0644,
4987 .proc_handler = proc_dointvec,
4988 },
4989 {
4990 .procname = "accept_redirects",
4991 .data = &ipv6_devconf.accept_redirects,
4992 .maxlen = sizeof(int),
4993 .mode = 0644,
4994 .proc_handler = proc_dointvec,
4995 },
4996 {
4997 .procname = "autoconf",
4998 .data = &ipv6_devconf.autoconf,
4999 .maxlen = sizeof(int),
5000 .mode = 0644,
5001 .proc_handler = proc_dointvec,
5002 },
5003 {
5004 .procname = "dad_transmits",
5005 .data = &ipv6_devconf.dad_transmits,
5006 .maxlen = sizeof(int),
5007 .mode = 0644,
5008 .proc_handler = proc_dointvec,
5009 },
5010 {
5011 .procname = "router_solicitations",
5012 .data = &ipv6_devconf.rtr_solicits,
5013 .maxlen = sizeof(int),
5014 .mode = 0644,
5015 .proc_handler = proc_dointvec,
5016 },
5017 {
5018 .procname = "router_solicitation_interval",
5019 .data = &ipv6_devconf.rtr_solicit_interval,
5020 .maxlen = sizeof(int),
5021 .mode = 0644,
5022 .proc_handler = proc_dointvec_jiffies,
5023 },
5024 {
5025 .procname = "router_solicitation_delay",
5026 .data = &ipv6_devconf.rtr_solicit_delay,
5027 .maxlen = sizeof(int),
5028 .mode = 0644,
5029 .proc_handler = proc_dointvec_jiffies,
5030 },
5031 {
5032 .procname = "force_mld_version",
5033 .data = &ipv6_devconf.force_mld_version,
5034 .maxlen = sizeof(int),
5035 .mode = 0644,
5036 .proc_handler = proc_dointvec,
5037 },
5038 {
5039 .procname = "mldv1_unsolicited_report_interval",
5040 .data =
5041 &ipv6_devconf.mldv1_unsolicited_report_interval,
5042 .maxlen = sizeof(int),
5043 .mode = 0644,
5044 .proc_handler = proc_dointvec_ms_jiffies,
5045 },
5046 {
5047 .procname = "mldv2_unsolicited_report_interval",
5048 .data =
5049 &ipv6_devconf.mldv2_unsolicited_report_interval,
5050 .maxlen = sizeof(int),
5051 .mode = 0644,
5052 .proc_handler = proc_dointvec_ms_jiffies,
5053 },
5054 {
5055 .procname = "use_tempaddr",
5056 .data = &ipv6_devconf.use_tempaddr,
5057 .maxlen = sizeof(int),
5058 .mode = 0644,
5059 .proc_handler = proc_dointvec,
5060 },
5061 {
5062 .procname = "temp_valid_lft",
5063 .data = &ipv6_devconf.temp_valid_lft,
5064 .maxlen = sizeof(int),
5065 .mode = 0644,
5066 .proc_handler = proc_dointvec,
5067 },
5068 {
5069 .procname = "temp_prefered_lft",
5070 .data = &ipv6_devconf.temp_prefered_lft,
5071 .maxlen = sizeof(int),
5072 .mode = 0644,
5073 .proc_handler = proc_dointvec,
5074 },
5075 {
5076 .procname = "regen_max_retry",
5077 .data = &ipv6_devconf.regen_max_retry,
5078 .maxlen = sizeof(int),
5079 .mode = 0644,
5080 .proc_handler = proc_dointvec,
5081 },
5082 {
5083 .procname = "max_desync_factor",
5084 .data = &ipv6_devconf.max_desync_factor,
5085 .maxlen = sizeof(int),
5086 .mode = 0644,
5087 .proc_handler = proc_dointvec,
5088 },
5089 {
5090 .procname = "max_addresses",
5091 .data = &ipv6_devconf.max_addresses,
5092 .maxlen = sizeof(int),
5093 .mode = 0644,
5094 .proc_handler = proc_dointvec,
5095 },
5096 {
5097 .procname = "accept_ra_defrtr",
5098 .data = &ipv6_devconf.accept_ra_defrtr,
5099 .maxlen = sizeof(int),
5100 .mode = 0644,
5101 .proc_handler = proc_dointvec,
5102 },
5103 {
5104 .procname = "accept_ra_pinfo",
5105 .data = &ipv6_devconf.accept_ra_pinfo,
5106 .maxlen = sizeof(int),
5107 .mode = 0644,
5108 .proc_handler = proc_dointvec,
5109 },
5110 #ifdef CONFIG_IPV6_ROUTER_PREF
5111 {
5112 .procname = "accept_ra_rtr_pref",
5113 .data = &ipv6_devconf.accept_ra_rtr_pref,
5114 .maxlen = sizeof(int),
5115 .mode = 0644,
5116 .proc_handler = proc_dointvec,
5117 },
5118 {
5119 .procname = "router_probe_interval",
5120 .data = &ipv6_devconf.rtr_probe_interval,
5121 .maxlen = sizeof(int),
5122 .mode = 0644,
5123 .proc_handler = proc_dointvec_jiffies,
5124 },
5125 #ifdef CONFIG_IPV6_ROUTE_INFO
5126 {
5127 .procname = "accept_ra_rt_info_max_plen",
5128 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5129 .maxlen = sizeof(int),
5130 .mode = 0644,
5131 .proc_handler = proc_dointvec,
5132 },
5133 #endif
5134 #endif
5135 {
5136 .procname = "proxy_ndp",
5137 .data = &ipv6_devconf.proxy_ndp,
5138 .maxlen = sizeof(int),
5139 .mode = 0644,
5140 .proc_handler = addrconf_sysctl_proxy_ndp,
5141 },
5142 {
5143 .procname = "accept_source_route",
5144 .data = &ipv6_devconf.accept_source_route,
5145 .maxlen = sizeof(int),
5146 .mode = 0644,
5147 .proc_handler = proc_dointvec,
5148 },
5149 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5150 {
5151 .procname = "optimistic_dad",
5152 .data = &ipv6_devconf.optimistic_dad,
5153 .maxlen = sizeof(int),
5154 .mode = 0644,
5155 .proc_handler = proc_dointvec,
5156
5157 },
5158 #endif
5159 #ifdef CONFIG_IPV6_MROUTE
5160 {
5161 .procname = "mc_forwarding",
5162 .data = &ipv6_devconf.mc_forwarding,
5163 .maxlen = sizeof(int),
5164 .mode = 0444,
5165 .proc_handler = proc_dointvec,
5166 },
5167 #endif
5168 {
5169 .procname = "disable_ipv6",
5170 .data = &ipv6_devconf.disable_ipv6,
5171 .maxlen = sizeof(int),
5172 .mode = 0644,
5173 .proc_handler = addrconf_sysctl_disable,
5174 },
5175 {
5176 .procname = "accept_dad",
5177 .data = &ipv6_devconf.accept_dad,
5178 .maxlen = sizeof(int),
5179 .mode = 0644,
5180 .proc_handler = proc_dointvec,
5181 },
5182 {
5183 .procname = "force_tllao",
5184 .data = &ipv6_devconf.force_tllao,
5185 .maxlen = sizeof(int),
5186 .mode = 0644,
5187 .proc_handler = proc_dointvec
5188 },
5189 {
5190 .procname = "ndisc_notify",
5191 .data = &ipv6_devconf.ndisc_notify,
5192 .maxlen = sizeof(int),
5193 .mode = 0644,
5194 .proc_handler = proc_dointvec
5195 },
5196 {
5197 .procname = "suppress_frag_ndisc",
5198 .data = &ipv6_devconf.suppress_frag_ndisc,
5199 .maxlen = sizeof(int),
5200 .mode = 0644,
5201 .proc_handler = proc_dointvec
5202 },
5203 {
5204 .procname = "accept_ra_from_local",
5205 .data = &ipv6_devconf.accept_ra_from_local,
5206 .maxlen = sizeof(int),
5207 .mode = 0644,
5208 .proc_handler = proc_dointvec,
5209 },
5210 {
5211 /* sentinel */
5212 }
5213 },
5214 };
5215
5216 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5217 struct inet6_dev *idev, struct ipv6_devconf *p)
5218 {
5219 int i;
5220 struct addrconf_sysctl_table *t;
5221 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5222
5223 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5224 if (t == NULL)
5225 goto out;
5226
5227 for (i = 0; t->addrconf_vars[i].data; i++) {
5228 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5229 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5230 t->addrconf_vars[i].extra2 = net;
5231 }
5232
5233 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5234
5235 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5236 if (t->sysctl_header == NULL)
5237 goto free;
5238
5239 p->sysctl = t;
5240 return 0;
5241
5242 free:
5243 kfree(t);
5244 out:
5245 return -ENOBUFS;
5246 }
5247
5248 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5249 {
5250 struct addrconf_sysctl_table *t;
5251
5252 if (p->sysctl == NULL)
5253 return;
5254
5255 t = p->sysctl;
5256 p->sysctl = NULL;
5257 unregister_net_sysctl_table(t->sysctl_header);
5258 kfree(t);
5259 }
5260
5261 static int addrconf_sysctl_register(struct inet6_dev *idev)
5262 {
5263 int err;
5264
5265 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5266 return -EINVAL;
5267
5268 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5269 &ndisc_ifinfo_sysctl_change);
5270 if (err)
5271 return err;
5272 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5273 idev, &idev->cnf);
5274 if (err)
5275 neigh_sysctl_unregister(idev->nd_parms);
5276
5277 return err;
5278 }
5279
5280 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5281 {
5282 __addrconf_sysctl_unregister(&idev->cnf);
5283 neigh_sysctl_unregister(idev->nd_parms);
5284 }
5285
5286
5287 #endif
5288
5289 static int __net_init addrconf_init_net(struct net *net)
5290 {
5291 int err = -ENOMEM;
5292 struct ipv6_devconf *all, *dflt;
5293
5294 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5295 if (all == NULL)
5296 goto err_alloc_all;
5297
5298 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5299 if (dflt == NULL)
5300 goto err_alloc_dflt;
5301
5302 /* these will be inherited by all namespaces */
5303 dflt->autoconf = ipv6_defaults.autoconf;
5304 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5305
5306 net->ipv6.devconf_all = all;
5307 net->ipv6.devconf_dflt = dflt;
5308
5309 #ifdef CONFIG_SYSCTL
5310 err = __addrconf_sysctl_register(net, "all", NULL, all);
5311 if (err < 0)
5312 goto err_reg_all;
5313
5314 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5315 if (err < 0)
5316 goto err_reg_dflt;
5317 #endif
5318 return 0;
5319
5320 #ifdef CONFIG_SYSCTL
5321 err_reg_dflt:
5322 __addrconf_sysctl_unregister(all);
5323 err_reg_all:
5324 kfree(dflt);
5325 #endif
5326 err_alloc_dflt:
5327 kfree(all);
5328 err_alloc_all:
5329 return err;
5330 }
5331
5332 static void __net_exit addrconf_exit_net(struct net *net)
5333 {
5334 #ifdef CONFIG_SYSCTL
5335 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5336 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5337 #endif
5338 if (!net_eq(net, &init_net)) {
5339 kfree(net->ipv6.devconf_dflt);
5340 kfree(net->ipv6.devconf_all);
5341 }
5342 }
5343
5344 static struct pernet_operations addrconf_ops = {
5345 .init = addrconf_init_net,
5346 .exit = addrconf_exit_net,
5347 };
5348
5349 static struct rtnl_af_ops inet6_ops = {
5350 .family = AF_INET6,
5351 .fill_link_af = inet6_fill_link_af,
5352 .get_link_af_size = inet6_get_link_af_size,
5353 .set_link_af = inet6_set_link_af,
5354 };
5355
5356 /*
5357 * Init / cleanup code
5358 */
5359
5360 int __init addrconf_init(void)
5361 {
5362 struct inet6_dev *idev;
5363 int i, err;
5364
5365 err = ipv6_addr_label_init();
5366 if (err < 0) {
5367 pr_crit("%s: cannot initialize default policy table: %d\n",
5368 __func__, err);
5369 goto out;
5370 }
5371
5372 err = register_pernet_subsys(&addrconf_ops);
5373 if (err < 0)
5374 goto out_addrlabel;
5375
5376 addrconf_wq = create_workqueue("ipv6_addrconf");
5377 if (!addrconf_wq) {
5378 err = -ENOMEM;
5379 goto out_nowq;
5380 }
5381
5382 /* The addrconf netdev notifier requires that loopback_dev
5383 * has it's ipv6 private information allocated and setup
5384 * before it can bring up and give link-local addresses
5385 * to other devices which are up.
5386 *
5387 * Unfortunately, loopback_dev is not necessarily the first
5388 * entry in the global dev_base list of net devices. In fact,
5389 * it is likely to be the very last entry on that list.
5390 * So this causes the notifier registry below to try and
5391 * give link-local addresses to all devices besides loopback_dev
5392 * first, then loopback_dev, which cases all the non-loopback_dev
5393 * devices to fail to get a link-local address.
5394 *
5395 * So, as a temporary fix, allocate the ipv6 structure for
5396 * loopback_dev first by hand.
5397 * Longer term, all of the dependencies ipv6 has upon the loopback
5398 * device and it being up should be removed.
5399 */
5400 rtnl_lock();
5401 idev = ipv6_add_dev(init_net.loopback_dev);
5402 rtnl_unlock();
5403 if (IS_ERR(idev)) {
5404 err = PTR_ERR(idev);
5405 goto errlo;
5406 }
5407
5408 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5409 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5410
5411 register_netdevice_notifier(&ipv6_dev_notf);
5412
5413 addrconf_verify();
5414
5415 rtnl_af_register(&inet6_ops);
5416
5417 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5418 NULL);
5419 if (err < 0)
5420 goto errout;
5421
5422 /* Only the first call to __rtnl_register can fail */
5423 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5424 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5425 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5426 inet6_dump_ifaddr, NULL);
5427 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5428 inet6_dump_ifmcaddr, NULL);
5429 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5430 inet6_dump_ifacaddr, NULL);
5431 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5432 inet6_netconf_dump_devconf, NULL);
5433
5434 ipv6_addr_label_rtnl_register();
5435
5436 return 0;
5437 errout:
5438 rtnl_af_unregister(&inet6_ops);
5439 unregister_netdevice_notifier(&ipv6_dev_notf);
5440 errlo:
5441 destroy_workqueue(addrconf_wq);
5442 out_nowq:
5443 unregister_pernet_subsys(&addrconf_ops);
5444 out_addrlabel:
5445 ipv6_addr_label_cleanup();
5446 out:
5447 return err;
5448 }
5449
5450 void addrconf_cleanup(void)
5451 {
5452 struct net_device *dev;
5453 int i;
5454
5455 unregister_netdevice_notifier(&ipv6_dev_notf);
5456 unregister_pernet_subsys(&addrconf_ops);
5457 ipv6_addr_label_cleanup();
5458
5459 rtnl_lock();
5460
5461 __rtnl_af_unregister(&inet6_ops);
5462
5463 /* clean dev list */
5464 for_each_netdev(&init_net, dev) {
5465 if (__in6_dev_get(dev) == NULL)
5466 continue;
5467 addrconf_ifdown(dev, 1);
5468 }
5469 addrconf_ifdown(init_net.loopback_dev, 2);
5470
5471 /*
5472 * Check hash table.
5473 */
5474 spin_lock_bh(&addrconf_hash_lock);
5475 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5476 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5477 spin_unlock_bh(&addrconf_hash_lock);
5478 cancel_delayed_work(&addr_chk_work);
5479 rtnl_unlock();
5480
5481 destroy_workqueue(addrconf_wq);
5482 }
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