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net: Convert uses of typedef ctl_table to struct ctl_table
[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
87 #ifdef CONFIG_IPV6_PRIVACY
88 #include <linux/random.h>
89 #endif
90
91 #include <linux/uaccess.h>
92 #include <asm/unaligned.h>
93
94 #include <linux/proc_fs.h>
95 #include <linux/seq_file.h>
96 #include <linux/export.h>
97
98 /* Set to 3 to get tracing... */
99 #define ACONF_DEBUG 2
100
101 #if ACONF_DEBUG >= 3
102 #define ADBG(x) printk x
103 #else
104 #define ADBG(x)
105 #endif
106
107 #define INFINITY_LIFE_TIME 0xFFFFFFFF
108
109 static inline u32 cstamp_delta(unsigned long cstamp)
110 {
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
112 }
113
114 #ifdef CONFIG_SYSCTL
115 static void addrconf_sysctl_register(struct inet6_dev *idev);
116 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
117 #else
118 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
119 {
120 }
121
122 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
123 {
124 }
125 #endif
126
127 #ifdef CONFIG_IPV6_PRIVACY
128 static void __ipv6_regen_rndid(struct inet6_dev *idev);
129 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
130 static void ipv6_regen_rndid(unsigned long data);
131 #endif
132
133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
134 static int ipv6_count_addresses(struct inet6_dev *idev);
135
136 /*
137 * Configured unicast address hash table
138 */
139 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
140 static DEFINE_SPINLOCK(addrconf_hash_lock);
141
142 static void addrconf_verify(unsigned long);
143
144 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
145 static DEFINE_SPINLOCK(addrconf_verify_lock);
146
147 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
148 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
149
150 static void addrconf_type_change(struct net_device *dev,
151 unsigned long event);
152 static int addrconf_ifdown(struct net_device *dev, int how);
153
154 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
155 int plen,
156 const struct net_device *dev,
157 u32 flags, u32 noflags);
158
159 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
160 static void addrconf_dad_timer(unsigned long data);
161 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
162 static void addrconf_dad_run(struct inet6_dev *idev);
163 static void addrconf_rs_timer(unsigned long data);
164 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
165 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
166
167 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
168 struct prefix_info *pinfo);
169 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
170 struct net_device *dev);
171
172 static struct ipv6_devconf ipv6_devconf __read_mostly = {
173 .forwarding = 0,
174 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
175 .mtu6 = IPV6_MIN_MTU,
176 .accept_ra = 1,
177 .accept_redirects = 1,
178 .autoconf = 1,
179 .force_mld_version = 0,
180 .dad_transmits = 1,
181 .rtr_solicits = MAX_RTR_SOLICITATIONS,
182 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
183 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
184 #ifdef CONFIG_IPV6_PRIVACY
185 .use_tempaddr = 0,
186 .temp_valid_lft = TEMP_VALID_LIFETIME,
187 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
188 .regen_max_retry = REGEN_MAX_RETRY,
189 .max_desync_factor = MAX_DESYNC_FACTOR,
190 #endif
191 .max_addresses = IPV6_MAX_ADDRESSES,
192 .accept_ra_defrtr = 1,
193 .accept_ra_pinfo = 1,
194 #ifdef CONFIG_IPV6_ROUTER_PREF
195 .accept_ra_rtr_pref = 1,
196 .rtr_probe_interval = 60 * HZ,
197 #ifdef CONFIG_IPV6_ROUTE_INFO
198 .accept_ra_rt_info_max_plen = 0,
199 #endif
200 #endif
201 .proxy_ndp = 0,
202 .accept_source_route = 0, /* we do not accept RH0 by default. */
203 .disable_ipv6 = 0,
204 .accept_dad = 1,
205 };
206
207 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
208 .forwarding = 0,
209 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
210 .mtu6 = IPV6_MIN_MTU,
211 .accept_ra = 1,
212 .accept_redirects = 1,
213 .autoconf = 1,
214 .dad_transmits = 1,
215 .rtr_solicits = MAX_RTR_SOLICITATIONS,
216 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
217 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
218 #ifdef CONFIG_IPV6_PRIVACY
219 .use_tempaddr = 0,
220 .temp_valid_lft = TEMP_VALID_LIFETIME,
221 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
222 .regen_max_retry = REGEN_MAX_RETRY,
223 .max_desync_factor = MAX_DESYNC_FACTOR,
224 #endif
225 .max_addresses = IPV6_MAX_ADDRESSES,
226 .accept_ra_defrtr = 1,
227 .accept_ra_pinfo = 1,
228 #ifdef CONFIG_IPV6_ROUTER_PREF
229 .accept_ra_rtr_pref = 1,
230 .rtr_probe_interval = 60 * HZ,
231 #ifdef CONFIG_IPV6_ROUTE_INFO
232 .accept_ra_rt_info_max_plen = 0,
233 #endif
234 #endif
235 .proxy_ndp = 0,
236 .accept_source_route = 0, /* we do not accept RH0 by default. */
237 .disable_ipv6 = 0,
238 .accept_dad = 1,
239 };
240
241 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
242 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
243 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
244 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
245 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
246 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
247 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
248 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
249
250 /* Check if a valid qdisc is available */
251 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
252 {
253 return !qdisc_tx_is_noop(dev);
254 }
255
256 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
257 {
258 if (del_timer(&ifp->timer))
259 __in6_ifa_put(ifp);
260 }
261
262 enum addrconf_timer_t {
263 AC_NONE,
264 AC_DAD,
265 AC_RS,
266 };
267
268 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
269 enum addrconf_timer_t what,
270 unsigned long when)
271 {
272 if (!del_timer(&ifp->timer))
273 in6_ifa_hold(ifp);
274
275 switch (what) {
276 case AC_DAD:
277 ifp->timer.function = addrconf_dad_timer;
278 break;
279 case AC_RS:
280 ifp->timer.function = addrconf_rs_timer;
281 break;
282 default:
283 break;
284 }
285 ifp->timer.expires = jiffies + when;
286 add_timer(&ifp->timer);
287 }
288
289 static int snmp6_alloc_dev(struct inet6_dev *idev)
290 {
291 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
292 sizeof(struct ipstats_mib),
293 __alignof__(struct ipstats_mib)) < 0)
294 goto err_ip;
295 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
296 GFP_KERNEL);
297 if (!idev->stats.icmpv6dev)
298 goto err_icmp;
299 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
300 GFP_KERNEL);
301 if (!idev->stats.icmpv6msgdev)
302 goto err_icmpmsg;
303
304 return 0;
305
306 err_icmpmsg:
307 kfree(idev->stats.icmpv6dev);
308 err_icmp:
309 snmp_mib_free((void __percpu **)idev->stats.ipv6);
310 err_ip:
311 return -ENOMEM;
312 }
313
314 static void snmp6_free_dev(struct inet6_dev *idev)
315 {
316 kfree(idev->stats.icmpv6msgdev);
317 kfree(idev->stats.icmpv6dev);
318 snmp_mib_free((void __percpu **)idev->stats.ipv6);
319 }
320
321 /* Nobody refers to this device, we may destroy it. */
322
323 void in6_dev_finish_destroy(struct inet6_dev *idev)
324 {
325 struct net_device *dev = idev->dev;
326
327 WARN_ON(!list_empty(&idev->addr_list));
328 WARN_ON(idev->mc_list != NULL);
329
330 #ifdef NET_REFCNT_DEBUG
331 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
332 #endif
333 dev_put(dev);
334 if (!idev->dead) {
335 pr_warn("Freeing alive inet6 device %p\n", idev);
336 return;
337 }
338 snmp6_free_dev(idev);
339 kfree_rcu(idev, rcu);
340 }
341 EXPORT_SYMBOL(in6_dev_finish_destroy);
342
343 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
344 {
345 struct inet6_dev *ndev;
346
347 ASSERT_RTNL();
348
349 if (dev->mtu < IPV6_MIN_MTU)
350 return NULL;
351
352 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
353
354 if (ndev == NULL)
355 return NULL;
356
357 rwlock_init(&ndev->lock);
358 ndev->dev = dev;
359 INIT_LIST_HEAD(&ndev->addr_list);
360
361 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
362 ndev->cnf.mtu6 = dev->mtu;
363 ndev->cnf.sysctl = NULL;
364 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
365 if (ndev->nd_parms == NULL) {
366 kfree(ndev);
367 return NULL;
368 }
369 if (ndev->cnf.forwarding)
370 dev_disable_lro(dev);
371 /* We refer to the device */
372 dev_hold(dev);
373
374 if (snmp6_alloc_dev(ndev) < 0) {
375 ADBG((KERN_WARNING
376 "%s: cannot allocate memory for statistics; dev=%s.\n",
377 __func__, dev->name));
378 neigh_parms_release(&nd_tbl, ndev->nd_parms);
379 dev_put(dev);
380 kfree(ndev);
381 return NULL;
382 }
383
384 if (snmp6_register_dev(ndev) < 0) {
385 ADBG((KERN_WARNING
386 "%s: cannot create /proc/net/dev_snmp6/%s\n",
387 __func__, dev->name));
388 neigh_parms_release(&nd_tbl, ndev->nd_parms);
389 ndev->dead = 1;
390 in6_dev_finish_destroy(ndev);
391 return NULL;
392 }
393
394 /* One reference from device. We must do this before
395 * we invoke __ipv6_regen_rndid().
396 */
397 in6_dev_hold(ndev);
398
399 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
400 ndev->cnf.accept_dad = -1;
401
402 #if IS_ENABLED(CONFIG_IPV6_SIT)
403 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
404 pr_info("%s: Disabled Multicast RS\n", dev->name);
405 ndev->cnf.rtr_solicits = 0;
406 }
407 #endif
408
409 #ifdef CONFIG_IPV6_PRIVACY
410 INIT_LIST_HEAD(&ndev->tempaddr_list);
411 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
412 if ((dev->flags&IFF_LOOPBACK) ||
413 dev->type == ARPHRD_TUNNEL ||
414 dev->type == ARPHRD_TUNNEL6 ||
415 dev->type == ARPHRD_SIT ||
416 dev->type == ARPHRD_NONE) {
417 ndev->cnf.use_tempaddr = -1;
418 } else {
419 in6_dev_hold(ndev);
420 ipv6_regen_rndid((unsigned long) ndev);
421 }
422 #endif
423 ndev->token = in6addr_any;
424
425 if (netif_running(dev) && addrconf_qdisc_ok(dev))
426 ndev->if_flags |= IF_READY;
427
428 ipv6_mc_init_dev(ndev);
429 ndev->tstamp = jiffies;
430 addrconf_sysctl_register(ndev);
431 /* protected by rtnl_lock */
432 rcu_assign_pointer(dev->ip6_ptr, ndev);
433
434 /* Join interface-local all-node multicast group */
435 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
436
437 /* Join all-node multicast group */
438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
439
440 /* Join all-router multicast group if forwarding is set */
441 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
442 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
443
444 return ndev;
445 }
446
447 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
448 {
449 struct inet6_dev *idev;
450
451 ASSERT_RTNL();
452
453 idev = __in6_dev_get(dev);
454 if (!idev) {
455 idev = ipv6_add_dev(dev);
456 if (!idev)
457 return NULL;
458 }
459
460 if (dev->flags&IFF_UP)
461 ipv6_mc_up(idev);
462 return idev;
463 }
464
465 static int inet6_netconf_msgsize_devconf(int type)
466 {
467 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
468 + nla_total_size(4); /* NETCONFA_IFINDEX */
469
470 /* type -1 is used for ALL */
471 if (type == -1 || type == NETCONFA_FORWARDING)
472 size += nla_total_size(4);
473 #ifdef CONFIG_IPV6_MROUTE
474 if (type == -1 || type == NETCONFA_MC_FORWARDING)
475 size += nla_total_size(4);
476 #endif
477
478 return size;
479 }
480
481 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
482 struct ipv6_devconf *devconf, u32 portid,
483 u32 seq, int event, unsigned int flags,
484 int type)
485 {
486 struct nlmsghdr *nlh;
487 struct netconfmsg *ncm;
488
489 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
490 flags);
491 if (nlh == NULL)
492 return -EMSGSIZE;
493
494 ncm = nlmsg_data(nlh);
495 ncm->ncm_family = AF_INET6;
496
497 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
498 goto nla_put_failure;
499
500 /* type -1 is used for ALL */
501 if ((type == -1 || type == NETCONFA_FORWARDING) &&
502 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
503 goto nla_put_failure;
504 #ifdef CONFIG_IPV6_MROUTE
505 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
506 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
507 devconf->mc_forwarding) < 0)
508 goto nla_put_failure;
509 #endif
510 return nlmsg_end(skb, nlh);
511
512 nla_put_failure:
513 nlmsg_cancel(skb, nlh);
514 return -EMSGSIZE;
515 }
516
517 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
518 struct ipv6_devconf *devconf)
519 {
520 struct sk_buff *skb;
521 int err = -ENOBUFS;
522
523 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
524 if (skb == NULL)
525 goto errout;
526
527 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
528 RTM_NEWNETCONF, 0, type);
529 if (err < 0) {
530 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
531 WARN_ON(err == -EMSGSIZE);
532 kfree_skb(skb);
533 goto errout;
534 }
535 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
536 return;
537 errout:
538 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
539 }
540
541 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
542 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
543 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
544 };
545
546 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
547 struct nlmsghdr *nlh)
548 {
549 struct net *net = sock_net(in_skb->sk);
550 struct nlattr *tb[NETCONFA_MAX+1];
551 struct netconfmsg *ncm;
552 struct sk_buff *skb;
553 struct ipv6_devconf *devconf;
554 struct inet6_dev *in6_dev;
555 struct net_device *dev;
556 int ifindex;
557 int err;
558
559 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
560 devconf_ipv6_policy);
561 if (err < 0)
562 goto errout;
563
564 err = EINVAL;
565 if (!tb[NETCONFA_IFINDEX])
566 goto errout;
567
568 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
569 switch (ifindex) {
570 case NETCONFA_IFINDEX_ALL:
571 devconf = net->ipv6.devconf_all;
572 break;
573 case NETCONFA_IFINDEX_DEFAULT:
574 devconf = net->ipv6.devconf_dflt;
575 break;
576 default:
577 dev = __dev_get_by_index(net, ifindex);
578 if (dev == NULL)
579 goto errout;
580 in6_dev = __in6_dev_get(dev);
581 if (in6_dev == NULL)
582 goto errout;
583 devconf = &in6_dev->cnf;
584 break;
585 }
586
587 err = -ENOBUFS;
588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
589 if (skb == NULL)
590 goto errout;
591
592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
593 NETLINK_CB(in_skb).portid,
594 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
595 -1);
596 if (err < 0) {
597 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
598 WARN_ON(err == -EMSGSIZE);
599 kfree_skb(skb);
600 goto errout;
601 }
602 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
603 errout:
604 return err;
605 }
606
607 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
608 struct netlink_callback *cb)
609 {
610 struct net *net = sock_net(skb->sk);
611 int h, s_h;
612 int idx, s_idx;
613 struct net_device *dev;
614 struct inet6_dev *idev;
615 struct hlist_head *head;
616
617 s_h = cb->args[0];
618 s_idx = idx = cb->args[1];
619
620 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
621 idx = 0;
622 head = &net->dev_index_head[h];
623 rcu_read_lock();
624 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
625 net->dev_base_seq;
626 hlist_for_each_entry_rcu(dev, head, index_hlist) {
627 if (idx < s_idx)
628 goto cont;
629 idev = __in6_dev_get(dev);
630 if (!idev)
631 goto cont;
632
633 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
634 &idev->cnf,
635 NETLINK_CB(cb->skb).portid,
636 cb->nlh->nlmsg_seq,
637 RTM_NEWNETCONF,
638 NLM_F_MULTI,
639 -1) <= 0) {
640 rcu_read_unlock();
641 goto done;
642 }
643 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
644 cont:
645 idx++;
646 }
647 rcu_read_unlock();
648 }
649 if (h == NETDEV_HASHENTRIES) {
650 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
651 net->ipv6.devconf_all,
652 NETLINK_CB(cb->skb).portid,
653 cb->nlh->nlmsg_seq,
654 RTM_NEWNETCONF, NLM_F_MULTI,
655 -1) <= 0)
656 goto done;
657 else
658 h++;
659 }
660 if (h == NETDEV_HASHENTRIES + 1) {
661 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
662 net->ipv6.devconf_dflt,
663 NETLINK_CB(cb->skb).portid,
664 cb->nlh->nlmsg_seq,
665 RTM_NEWNETCONF, NLM_F_MULTI,
666 -1) <= 0)
667 goto done;
668 else
669 h++;
670 }
671 done:
672 cb->args[0] = h;
673 cb->args[1] = idx;
674
675 return skb->len;
676 }
677
678 #ifdef CONFIG_SYSCTL
679 static void dev_forward_change(struct inet6_dev *idev)
680 {
681 struct net_device *dev;
682 struct inet6_ifaddr *ifa;
683
684 if (!idev)
685 return;
686 dev = idev->dev;
687 if (idev->cnf.forwarding)
688 dev_disable_lro(dev);
689 if (dev->flags & IFF_MULTICAST) {
690 if (idev->cnf.forwarding) {
691 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
692 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
693 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
694 } else {
695 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
696 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
697 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
698 }
699 }
700
701 list_for_each_entry(ifa, &idev->addr_list, if_list) {
702 if (ifa->flags&IFA_F_TENTATIVE)
703 continue;
704 if (idev->cnf.forwarding)
705 addrconf_join_anycast(ifa);
706 else
707 addrconf_leave_anycast(ifa);
708 }
709 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
710 dev->ifindex, &idev->cnf);
711 }
712
713
714 static void addrconf_forward_change(struct net *net, __s32 newf)
715 {
716 struct net_device *dev;
717 struct inet6_dev *idev;
718
719 for_each_netdev(net, dev) {
720 idev = __in6_dev_get(dev);
721 if (idev) {
722 int changed = (!idev->cnf.forwarding) ^ (!newf);
723 idev->cnf.forwarding = newf;
724 if (changed)
725 dev_forward_change(idev);
726 }
727 }
728 }
729
730 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
731 {
732 struct net *net;
733 int old;
734
735 if (!rtnl_trylock())
736 return restart_syscall();
737
738 net = (struct net *)table->extra2;
739 old = *p;
740 *p = newf;
741
742 if (p == &net->ipv6.devconf_dflt->forwarding) {
743 if ((!newf) ^ (!old))
744 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
745 NETCONFA_IFINDEX_DEFAULT,
746 net->ipv6.devconf_dflt);
747 rtnl_unlock();
748 return 0;
749 }
750
751 if (p == &net->ipv6.devconf_all->forwarding) {
752 net->ipv6.devconf_dflt->forwarding = newf;
753 addrconf_forward_change(net, newf);
754 if ((!newf) ^ (!old))
755 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
756 NETCONFA_IFINDEX_ALL,
757 net->ipv6.devconf_all);
758 } else if ((!newf) ^ (!old))
759 dev_forward_change((struct inet6_dev *)table->extra1);
760 rtnl_unlock();
761
762 if (newf)
763 rt6_purge_dflt_routers(net);
764 return 1;
765 }
766 #endif
767
768 /* Nobody refers to this ifaddr, destroy it */
769 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
770 {
771 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
772
773 #ifdef NET_REFCNT_DEBUG
774 pr_debug("%s\n", __func__);
775 #endif
776
777 in6_dev_put(ifp->idev);
778
779 if (del_timer(&ifp->timer))
780 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
781
782 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
783 pr_warn("Freeing alive inet6 address %p\n", ifp);
784 return;
785 }
786 ip6_rt_put(ifp->rt);
787
788 kfree_rcu(ifp, rcu);
789 }
790
791 static void
792 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
793 {
794 struct list_head *p;
795 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
796
797 /*
798 * Each device address list is sorted in order of scope -
799 * global before linklocal.
800 */
801 list_for_each(p, &idev->addr_list) {
802 struct inet6_ifaddr *ifa
803 = list_entry(p, struct inet6_ifaddr, if_list);
804 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
805 break;
806 }
807
808 list_add_tail(&ifp->if_list, p);
809 }
810
811 static u32 inet6_addr_hash(const struct in6_addr *addr)
812 {
813 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
814 }
815
816 /* On success it returns ifp with increased reference count */
817
818 static struct inet6_ifaddr *
819 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
820 int scope, u32 flags)
821 {
822 struct inet6_ifaddr *ifa = NULL;
823 struct rt6_info *rt;
824 unsigned int hash;
825 int err = 0;
826 int addr_type = ipv6_addr_type(addr);
827
828 if (addr_type == IPV6_ADDR_ANY ||
829 addr_type & IPV6_ADDR_MULTICAST ||
830 (!(idev->dev->flags & IFF_LOOPBACK) &&
831 addr_type & IPV6_ADDR_LOOPBACK))
832 return ERR_PTR(-EADDRNOTAVAIL);
833
834 rcu_read_lock_bh();
835 if (idev->dead) {
836 err = -ENODEV; /*XXX*/
837 goto out2;
838 }
839
840 if (idev->cnf.disable_ipv6) {
841 err = -EACCES;
842 goto out2;
843 }
844
845 spin_lock(&addrconf_hash_lock);
846
847 /* Ignore adding duplicate addresses on an interface */
848 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
849 ADBG(("ipv6_add_addr: already assigned\n"));
850 err = -EEXIST;
851 goto out;
852 }
853
854 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
855
856 if (ifa == NULL) {
857 ADBG(("ipv6_add_addr: malloc failed\n"));
858 err = -ENOBUFS;
859 goto out;
860 }
861
862 rt = addrconf_dst_alloc(idev, addr, false);
863 if (IS_ERR(rt)) {
864 err = PTR_ERR(rt);
865 goto out;
866 }
867
868 ifa->addr = *addr;
869
870 spin_lock_init(&ifa->lock);
871 spin_lock_init(&ifa->state_lock);
872 init_timer(&ifa->timer);
873 INIT_HLIST_NODE(&ifa->addr_lst);
874 ifa->timer.data = (unsigned long) ifa;
875 ifa->scope = scope;
876 ifa->prefix_len = pfxlen;
877 ifa->flags = flags | IFA_F_TENTATIVE;
878 ifa->cstamp = ifa->tstamp = jiffies;
879 ifa->tokenized = false;
880
881 ifa->rt = rt;
882
883 ifa->idev = idev;
884 in6_dev_hold(idev);
885 /* For caller */
886 in6_ifa_hold(ifa);
887
888 /* Add to big hash table */
889 hash = inet6_addr_hash(addr);
890
891 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
892 spin_unlock(&addrconf_hash_lock);
893
894 write_lock(&idev->lock);
895 /* Add to inet6_dev unicast addr list. */
896 ipv6_link_dev_addr(idev, ifa);
897
898 #ifdef CONFIG_IPV6_PRIVACY
899 if (ifa->flags&IFA_F_TEMPORARY) {
900 list_add(&ifa->tmp_list, &idev->tempaddr_list);
901 in6_ifa_hold(ifa);
902 }
903 #endif
904
905 in6_ifa_hold(ifa);
906 write_unlock(&idev->lock);
907 out2:
908 rcu_read_unlock_bh();
909
910 if (likely(err == 0))
911 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
912 else {
913 kfree(ifa);
914 ifa = ERR_PTR(err);
915 }
916
917 return ifa;
918 out:
919 spin_unlock(&addrconf_hash_lock);
920 goto out2;
921 }
922
923 /* This function wants to get referenced ifp and releases it before return */
924
925 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
926 {
927 struct inet6_ifaddr *ifa, *ifn;
928 struct inet6_dev *idev = ifp->idev;
929 int state;
930 int deleted = 0, onlink = 0;
931 unsigned long expires = jiffies;
932
933 spin_lock_bh(&ifp->state_lock);
934 state = ifp->state;
935 ifp->state = INET6_IFADDR_STATE_DEAD;
936 spin_unlock_bh(&ifp->state_lock);
937
938 if (state == INET6_IFADDR_STATE_DEAD)
939 goto out;
940
941 spin_lock_bh(&addrconf_hash_lock);
942 hlist_del_init_rcu(&ifp->addr_lst);
943 spin_unlock_bh(&addrconf_hash_lock);
944
945 write_lock_bh(&idev->lock);
946 #ifdef CONFIG_IPV6_PRIVACY
947 if (ifp->flags&IFA_F_TEMPORARY) {
948 list_del(&ifp->tmp_list);
949 if (ifp->ifpub) {
950 in6_ifa_put(ifp->ifpub);
951 ifp->ifpub = NULL;
952 }
953 __in6_ifa_put(ifp);
954 }
955 #endif
956
957 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
958 if (ifa == ifp) {
959 list_del_init(&ifp->if_list);
960 __in6_ifa_put(ifp);
961
962 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
963 break;
964 deleted = 1;
965 continue;
966 } else if (ifp->flags & IFA_F_PERMANENT) {
967 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
968 ifp->prefix_len)) {
969 if (ifa->flags & IFA_F_PERMANENT) {
970 onlink = 1;
971 if (deleted)
972 break;
973 } else {
974 unsigned long lifetime;
975
976 if (!onlink)
977 onlink = -1;
978
979 spin_lock(&ifa->lock);
980
981 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
982 /*
983 * Note: Because this address is
984 * not permanent, lifetime <
985 * LONG_MAX / HZ here.
986 */
987 if (time_before(expires,
988 ifa->tstamp + lifetime * HZ))
989 expires = ifa->tstamp + lifetime * HZ;
990 spin_unlock(&ifa->lock);
991 }
992 }
993 }
994 }
995 write_unlock_bh(&idev->lock);
996
997 addrconf_del_timer(ifp);
998
999 ipv6_ifa_notify(RTM_DELADDR, ifp);
1000
1001 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1002
1003 /*
1004 * Purge or update corresponding prefix
1005 *
1006 * 1) we don't purge prefix here if address was not permanent.
1007 * prefix is managed by its own lifetime.
1008 * 2) if there're no addresses, delete prefix.
1009 * 3) if there're still other permanent address(es),
1010 * corresponding prefix is still permanent.
1011 * 4) otherwise, update prefix lifetime to the
1012 * longest valid lifetime among the corresponding
1013 * addresses on the device.
1014 * Note: subsequent RA will update lifetime.
1015 *
1016 * --yoshfuji
1017 */
1018 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
1019 struct in6_addr prefix;
1020 struct rt6_info *rt;
1021
1022 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1023
1024 rt = addrconf_get_prefix_route(&prefix,
1025 ifp->prefix_len,
1026 ifp->idev->dev,
1027 0, RTF_GATEWAY | RTF_DEFAULT);
1028
1029 if (rt) {
1030 if (onlink == 0) {
1031 ip6_del_rt(rt);
1032 rt = NULL;
1033 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1034 rt6_set_expires(rt, expires);
1035 }
1036 }
1037 ip6_rt_put(rt);
1038 }
1039
1040 /* clean up prefsrc entries */
1041 rt6_remove_prefsrc(ifp);
1042 out:
1043 in6_ifa_put(ifp);
1044 }
1045
1046 #ifdef CONFIG_IPV6_PRIVACY
1047 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1048 {
1049 struct inet6_dev *idev = ifp->idev;
1050 struct in6_addr addr, *tmpaddr;
1051 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1052 unsigned long regen_advance;
1053 int tmp_plen;
1054 int ret = 0;
1055 int max_addresses;
1056 u32 addr_flags;
1057 unsigned long now = jiffies;
1058
1059 write_lock(&idev->lock);
1060 if (ift) {
1061 spin_lock_bh(&ift->lock);
1062 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1063 spin_unlock_bh(&ift->lock);
1064 tmpaddr = &addr;
1065 } else {
1066 tmpaddr = NULL;
1067 }
1068 retry:
1069 in6_dev_hold(idev);
1070 if (idev->cnf.use_tempaddr <= 0) {
1071 write_unlock(&idev->lock);
1072 pr_info("%s: use_tempaddr is disabled\n", __func__);
1073 in6_dev_put(idev);
1074 ret = -1;
1075 goto out;
1076 }
1077 spin_lock_bh(&ifp->lock);
1078 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1079 idev->cnf.use_tempaddr = -1; /*XXX*/
1080 spin_unlock_bh(&ifp->lock);
1081 write_unlock(&idev->lock);
1082 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1083 __func__);
1084 in6_dev_put(idev);
1085 ret = -1;
1086 goto out;
1087 }
1088 in6_ifa_hold(ifp);
1089 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1090 __ipv6_try_regen_rndid(idev, tmpaddr);
1091 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1092 age = (now - ifp->tstamp) / HZ;
1093 tmp_valid_lft = min_t(__u32,
1094 ifp->valid_lft,
1095 idev->cnf.temp_valid_lft + age);
1096 tmp_prefered_lft = min_t(__u32,
1097 ifp->prefered_lft,
1098 idev->cnf.temp_prefered_lft + age -
1099 idev->cnf.max_desync_factor);
1100 tmp_plen = ifp->prefix_len;
1101 max_addresses = idev->cnf.max_addresses;
1102 tmp_tstamp = ifp->tstamp;
1103 spin_unlock_bh(&ifp->lock);
1104
1105 regen_advance = idev->cnf.regen_max_retry *
1106 idev->cnf.dad_transmits *
1107 idev->nd_parms->retrans_time / HZ;
1108 write_unlock(&idev->lock);
1109
1110 /* A temporary address is created only if this calculated Preferred
1111 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1112 * an implementation must not create a temporary address with a zero
1113 * Preferred Lifetime.
1114 */
1115 if (tmp_prefered_lft <= regen_advance) {
1116 in6_ifa_put(ifp);
1117 in6_dev_put(idev);
1118 ret = -1;
1119 goto out;
1120 }
1121
1122 addr_flags = IFA_F_TEMPORARY;
1123 /* set in addrconf_prefix_rcv() */
1124 if (ifp->flags & IFA_F_OPTIMISTIC)
1125 addr_flags |= IFA_F_OPTIMISTIC;
1126
1127 ift = !max_addresses ||
1128 ipv6_count_addresses(idev) < max_addresses ?
1129 ipv6_add_addr(idev, &addr, tmp_plen, ipv6_addr_scope(&addr),
1130 addr_flags) : NULL;
1131 if (IS_ERR_OR_NULL(ift)) {
1132 in6_ifa_put(ifp);
1133 in6_dev_put(idev);
1134 pr_info("%s: retry temporary address regeneration\n", __func__);
1135 tmpaddr = &addr;
1136 write_lock(&idev->lock);
1137 goto retry;
1138 }
1139
1140 spin_lock_bh(&ift->lock);
1141 ift->ifpub = ifp;
1142 ift->valid_lft = tmp_valid_lft;
1143 ift->prefered_lft = tmp_prefered_lft;
1144 ift->cstamp = now;
1145 ift->tstamp = tmp_tstamp;
1146 spin_unlock_bh(&ift->lock);
1147
1148 addrconf_dad_start(ift);
1149 in6_ifa_put(ift);
1150 in6_dev_put(idev);
1151 out:
1152 return ret;
1153 }
1154 #endif
1155
1156 /*
1157 * Choose an appropriate source address (RFC3484)
1158 */
1159 enum {
1160 IPV6_SADDR_RULE_INIT = 0,
1161 IPV6_SADDR_RULE_LOCAL,
1162 IPV6_SADDR_RULE_SCOPE,
1163 IPV6_SADDR_RULE_PREFERRED,
1164 #ifdef CONFIG_IPV6_MIP6
1165 IPV6_SADDR_RULE_HOA,
1166 #endif
1167 IPV6_SADDR_RULE_OIF,
1168 IPV6_SADDR_RULE_LABEL,
1169 #ifdef CONFIG_IPV6_PRIVACY
1170 IPV6_SADDR_RULE_PRIVACY,
1171 #endif
1172 IPV6_SADDR_RULE_ORCHID,
1173 IPV6_SADDR_RULE_PREFIX,
1174 IPV6_SADDR_RULE_MAX
1175 };
1176
1177 struct ipv6_saddr_score {
1178 int rule;
1179 int addr_type;
1180 struct inet6_ifaddr *ifa;
1181 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1182 int scopedist;
1183 int matchlen;
1184 };
1185
1186 struct ipv6_saddr_dst {
1187 const struct in6_addr *addr;
1188 int ifindex;
1189 int scope;
1190 int label;
1191 unsigned int prefs;
1192 };
1193
1194 static inline int ipv6_saddr_preferred(int type)
1195 {
1196 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1197 return 1;
1198 return 0;
1199 }
1200
1201 static int ipv6_get_saddr_eval(struct net *net,
1202 struct ipv6_saddr_score *score,
1203 struct ipv6_saddr_dst *dst,
1204 int i)
1205 {
1206 int ret;
1207
1208 if (i <= score->rule) {
1209 switch (i) {
1210 case IPV6_SADDR_RULE_SCOPE:
1211 ret = score->scopedist;
1212 break;
1213 case IPV6_SADDR_RULE_PREFIX:
1214 ret = score->matchlen;
1215 break;
1216 default:
1217 ret = !!test_bit(i, score->scorebits);
1218 }
1219 goto out;
1220 }
1221
1222 switch (i) {
1223 case IPV6_SADDR_RULE_INIT:
1224 /* Rule 0: remember if hiscore is not ready yet */
1225 ret = !!score->ifa;
1226 break;
1227 case IPV6_SADDR_RULE_LOCAL:
1228 /* Rule 1: Prefer same address */
1229 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1230 break;
1231 case IPV6_SADDR_RULE_SCOPE:
1232 /* Rule 2: Prefer appropriate scope
1233 *
1234 * ret
1235 * ^
1236 * -1 | d 15
1237 * ---+--+-+---> scope
1238 * |
1239 * | d is scope of the destination.
1240 * B-d | \
1241 * | \ <- smaller scope is better if
1242 * B-15 | \ if scope is enough for destinaion.
1243 * | ret = B - scope (-1 <= scope >= d <= 15).
1244 * d-C-1 | /
1245 * |/ <- greater is better
1246 * -C / if scope is not enough for destination.
1247 * /| ret = scope - C (-1 <= d < scope <= 15).
1248 *
1249 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1250 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1251 * Assume B = 0 and we get C > 29.
1252 */
1253 ret = __ipv6_addr_src_scope(score->addr_type);
1254 if (ret >= dst->scope)
1255 ret = -ret;
1256 else
1257 ret -= 128; /* 30 is enough */
1258 score->scopedist = ret;
1259 break;
1260 case IPV6_SADDR_RULE_PREFERRED:
1261 /* Rule 3: Avoid deprecated and optimistic addresses */
1262 ret = ipv6_saddr_preferred(score->addr_type) ||
1263 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1264 break;
1265 #ifdef CONFIG_IPV6_MIP6
1266 case IPV6_SADDR_RULE_HOA:
1267 {
1268 /* Rule 4: Prefer home address */
1269 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1270 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1271 break;
1272 }
1273 #endif
1274 case IPV6_SADDR_RULE_OIF:
1275 /* Rule 5: Prefer outgoing interface */
1276 ret = (!dst->ifindex ||
1277 dst->ifindex == score->ifa->idev->dev->ifindex);
1278 break;
1279 case IPV6_SADDR_RULE_LABEL:
1280 /* Rule 6: Prefer matching label */
1281 ret = ipv6_addr_label(net,
1282 &score->ifa->addr, score->addr_type,
1283 score->ifa->idev->dev->ifindex) == dst->label;
1284 break;
1285 #ifdef CONFIG_IPV6_PRIVACY
1286 case IPV6_SADDR_RULE_PRIVACY:
1287 {
1288 /* Rule 7: Prefer public address
1289 * Note: prefer temporary address if use_tempaddr >= 2
1290 */
1291 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1292 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1293 score->ifa->idev->cnf.use_tempaddr >= 2;
1294 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1295 break;
1296 }
1297 #endif
1298 case IPV6_SADDR_RULE_ORCHID:
1299 /* Rule 8-: Prefer ORCHID vs ORCHID or
1300 * non-ORCHID vs non-ORCHID
1301 */
1302 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1303 ipv6_addr_orchid(dst->addr));
1304 break;
1305 case IPV6_SADDR_RULE_PREFIX:
1306 /* Rule 8: Use longest matching prefix */
1307 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1308 if (ret > score->ifa->prefix_len)
1309 ret = score->ifa->prefix_len;
1310 score->matchlen = ret;
1311 break;
1312 default:
1313 ret = 0;
1314 }
1315
1316 if (ret)
1317 __set_bit(i, score->scorebits);
1318 score->rule = i;
1319 out:
1320 return ret;
1321 }
1322
1323 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1324 const struct in6_addr *daddr, unsigned int prefs,
1325 struct in6_addr *saddr)
1326 {
1327 struct ipv6_saddr_score scores[2],
1328 *score = &scores[0], *hiscore = &scores[1];
1329 struct ipv6_saddr_dst dst;
1330 struct net_device *dev;
1331 int dst_type;
1332
1333 dst_type = __ipv6_addr_type(daddr);
1334 dst.addr = daddr;
1335 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1336 dst.scope = __ipv6_addr_src_scope(dst_type);
1337 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1338 dst.prefs = prefs;
1339
1340 hiscore->rule = -1;
1341 hiscore->ifa = NULL;
1342
1343 rcu_read_lock();
1344
1345 for_each_netdev_rcu(net, dev) {
1346 struct inet6_dev *idev;
1347
1348 /* Candidate Source Address (section 4)
1349 * - multicast and link-local destination address,
1350 * the set of candidate source address MUST only
1351 * include addresses assigned to interfaces
1352 * belonging to the same link as the outgoing
1353 * interface.
1354 * (- For site-local destination addresses, the
1355 * set of candidate source addresses MUST only
1356 * include addresses assigned to interfaces
1357 * belonging to the same site as the outgoing
1358 * interface.)
1359 */
1360 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1361 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1362 dst.ifindex && dev->ifindex != dst.ifindex)
1363 continue;
1364
1365 idev = __in6_dev_get(dev);
1366 if (!idev)
1367 continue;
1368
1369 read_lock_bh(&idev->lock);
1370 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1371 int i;
1372
1373 /*
1374 * - Tentative Address (RFC2462 section 5.4)
1375 * - A tentative address is not considered
1376 * "assigned to an interface" in the traditional
1377 * sense, unless it is also flagged as optimistic.
1378 * - Candidate Source Address (section 4)
1379 * - In any case, anycast addresses, multicast
1380 * addresses, and the unspecified address MUST
1381 * NOT be included in a candidate set.
1382 */
1383 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1384 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1385 continue;
1386
1387 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1388
1389 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1390 score->addr_type & IPV6_ADDR_MULTICAST)) {
1391 LIMIT_NETDEBUG(KERN_DEBUG
1392 "ADDRCONF: unspecified / multicast address "
1393 "assigned as unicast address on %s",
1394 dev->name);
1395 continue;
1396 }
1397
1398 score->rule = -1;
1399 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1400
1401 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1402 int minihiscore, miniscore;
1403
1404 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1405 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1406
1407 if (minihiscore > miniscore) {
1408 if (i == IPV6_SADDR_RULE_SCOPE &&
1409 score->scopedist > 0) {
1410 /*
1411 * special case:
1412 * each remaining entry
1413 * has too small (not enough)
1414 * scope, because ifa entries
1415 * are sorted by their scope
1416 * values.
1417 */
1418 goto try_nextdev;
1419 }
1420 break;
1421 } else if (minihiscore < miniscore) {
1422 if (hiscore->ifa)
1423 in6_ifa_put(hiscore->ifa);
1424
1425 in6_ifa_hold(score->ifa);
1426
1427 swap(hiscore, score);
1428
1429 /* restore our iterator */
1430 score->ifa = hiscore->ifa;
1431
1432 break;
1433 }
1434 }
1435 }
1436 try_nextdev:
1437 read_unlock_bh(&idev->lock);
1438 }
1439 rcu_read_unlock();
1440
1441 if (!hiscore->ifa)
1442 return -EADDRNOTAVAIL;
1443
1444 *saddr = hiscore->ifa->addr;
1445 in6_ifa_put(hiscore->ifa);
1446 return 0;
1447 }
1448 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1449
1450 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1451 unsigned char banned_flags)
1452 {
1453 struct inet6_dev *idev;
1454 int err = -EADDRNOTAVAIL;
1455
1456 rcu_read_lock();
1457 idev = __in6_dev_get(dev);
1458 if (idev) {
1459 struct inet6_ifaddr *ifp;
1460
1461 read_lock_bh(&idev->lock);
1462 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1463 if (ifp->scope == IFA_LINK &&
1464 !(ifp->flags & banned_flags)) {
1465 *addr = ifp->addr;
1466 err = 0;
1467 break;
1468 }
1469 }
1470 read_unlock_bh(&idev->lock);
1471 }
1472 rcu_read_unlock();
1473 return err;
1474 }
1475
1476 static int ipv6_count_addresses(struct inet6_dev *idev)
1477 {
1478 int cnt = 0;
1479 struct inet6_ifaddr *ifp;
1480
1481 read_lock_bh(&idev->lock);
1482 list_for_each_entry(ifp, &idev->addr_list, if_list)
1483 cnt++;
1484 read_unlock_bh(&idev->lock);
1485 return cnt;
1486 }
1487
1488 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1489 const struct net_device *dev, int strict)
1490 {
1491 struct inet6_ifaddr *ifp;
1492 unsigned int hash = inet6_addr_hash(addr);
1493
1494 rcu_read_lock_bh();
1495 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1496 if (!net_eq(dev_net(ifp->idev->dev), net))
1497 continue;
1498 if (ipv6_addr_equal(&ifp->addr, addr) &&
1499 !(ifp->flags&IFA_F_TENTATIVE) &&
1500 (dev == NULL || ifp->idev->dev == dev ||
1501 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1502 rcu_read_unlock_bh();
1503 return 1;
1504 }
1505 }
1506
1507 rcu_read_unlock_bh();
1508 return 0;
1509 }
1510 EXPORT_SYMBOL(ipv6_chk_addr);
1511
1512 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1513 struct net_device *dev)
1514 {
1515 unsigned int hash = inet6_addr_hash(addr);
1516 struct inet6_ifaddr *ifp;
1517
1518 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1519 if (!net_eq(dev_net(ifp->idev->dev), net))
1520 continue;
1521 if (ipv6_addr_equal(&ifp->addr, addr)) {
1522 if (dev == NULL || ifp->idev->dev == dev)
1523 return true;
1524 }
1525 }
1526 return false;
1527 }
1528
1529 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1530 {
1531 struct inet6_dev *idev;
1532 struct inet6_ifaddr *ifa;
1533 int onlink;
1534
1535 onlink = 0;
1536 rcu_read_lock();
1537 idev = __in6_dev_get(dev);
1538 if (idev) {
1539 read_lock_bh(&idev->lock);
1540 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1541 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1542 ifa->prefix_len);
1543 if (onlink)
1544 break;
1545 }
1546 read_unlock_bh(&idev->lock);
1547 }
1548 rcu_read_unlock();
1549 return onlink;
1550 }
1551 EXPORT_SYMBOL(ipv6_chk_prefix);
1552
1553 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1554 struct net_device *dev, int strict)
1555 {
1556 struct inet6_ifaddr *ifp, *result = NULL;
1557 unsigned int hash = inet6_addr_hash(addr);
1558
1559 rcu_read_lock_bh();
1560 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1561 if (!net_eq(dev_net(ifp->idev->dev), net))
1562 continue;
1563 if (ipv6_addr_equal(&ifp->addr, addr)) {
1564 if (dev == NULL || ifp->idev->dev == dev ||
1565 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1566 result = ifp;
1567 in6_ifa_hold(ifp);
1568 break;
1569 }
1570 }
1571 }
1572 rcu_read_unlock_bh();
1573
1574 return result;
1575 }
1576
1577 /* Gets referenced address, destroys ifaddr */
1578
1579 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1580 {
1581 if (ifp->flags&IFA_F_PERMANENT) {
1582 spin_lock_bh(&ifp->lock);
1583 addrconf_del_timer(ifp);
1584 ifp->flags |= IFA_F_TENTATIVE;
1585 if (dad_failed)
1586 ifp->flags |= IFA_F_DADFAILED;
1587 spin_unlock_bh(&ifp->lock);
1588 if (dad_failed)
1589 ipv6_ifa_notify(0, ifp);
1590 in6_ifa_put(ifp);
1591 #ifdef CONFIG_IPV6_PRIVACY
1592 } else if (ifp->flags&IFA_F_TEMPORARY) {
1593 struct inet6_ifaddr *ifpub;
1594 spin_lock_bh(&ifp->lock);
1595 ifpub = ifp->ifpub;
1596 if (ifpub) {
1597 in6_ifa_hold(ifpub);
1598 spin_unlock_bh(&ifp->lock);
1599 ipv6_create_tempaddr(ifpub, ifp);
1600 in6_ifa_put(ifpub);
1601 } else {
1602 spin_unlock_bh(&ifp->lock);
1603 }
1604 ipv6_del_addr(ifp);
1605 #endif
1606 } else
1607 ipv6_del_addr(ifp);
1608 }
1609
1610 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1611 {
1612 int err = -ENOENT;
1613
1614 spin_lock(&ifp->state_lock);
1615 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1616 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1617 err = 0;
1618 }
1619 spin_unlock(&ifp->state_lock);
1620
1621 return err;
1622 }
1623
1624 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1625 {
1626 struct inet6_dev *idev = ifp->idev;
1627
1628 if (addrconf_dad_end(ifp)) {
1629 in6_ifa_put(ifp);
1630 return;
1631 }
1632
1633 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1634 ifp->idev->dev->name, &ifp->addr);
1635
1636 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1637 struct in6_addr addr;
1638
1639 addr.s6_addr32[0] = htonl(0xfe800000);
1640 addr.s6_addr32[1] = 0;
1641
1642 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1643 ipv6_addr_equal(&ifp->addr, &addr)) {
1644 /* DAD failed for link-local based on MAC address */
1645 idev->cnf.disable_ipv6 = 1;
1646
1647 pr_info("%s: IPv6 being disabled!\n",
1648 ifp->idev->dev->name);
1649 }
1650 }
1651
1652 addrconf_dad_stop(ifp, 1);
1653 }
1654
1655 /* Join to solicited addr multicast group. */
1656
1657 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1658 {
1659 struct in6_addr maddr;
1660
1661 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1662 return;
1663
1664 addrconf_addr_solict_mult(addr, &maddr);
1665 ipv6_dev_mc_inc(dev, &maddr);
1666 }
1667
1668 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1669 {
1670 struct in6_addr maddr;
1671
1672 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1673 return;
1674
1675 addrconf_addr_solict_mult(addr, &maddr);
1676 __ipv6_dev_mc_dec(idev, &maddr);
1677 }
1678
1679 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1680 {
1681 struct in6_addr addr;
1682 if (ifp->prefix_len == 127) /* RFC 6164 */
1683 return;
1684 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1685 if (ipv6_addr_any(&addr))
1686 return;
1687 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1688 }
1689
1690 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1691 {
1692 struct in6_addr addr;
1693 if (ifp->prefix_len == 127) /* RFC 6164 */
1694 return;
1695 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1696 if (ipv6_addr_any(&addr))
1697 return;
1698 __ipv6_dev_ac_dec(ifp->idev, &addr);
1699 }
1700
1701 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1702 {
1703 if (dev->addr_len != ETH_ALEN)
1704 return -1;
1705 memcpy(eui, dev->dev_addr, 3);
1706 memcpy(eui + 5, dev->dev_addr + 3, 3);
1707
1708 /*
1709 * The zSeries OSA network cards can be shared among various
1710 * OS instances, but the OSA cards have only one MAC address.
1711 * This leads to duplicate address conflicts in conjunction
1712 * with IPv6 if more than one instance uses the same card.
1713 *
1714 * The driver for these cards can deliver a unique 16-bit
1715 * identifier for each instance sharing the same card. It is
1716 * placed instead of 0xFFFE in the interface identifier. The
1717 * "u" bit of the interface identifier is not inverted in this
1718 * case. Hence the resulting interface identifier has local
1719 * scope according to RFC2373.
1720 */
1721 if (dev->dev_id) {
1722 eui[3] = (dev->dev_id >> 8) & 0xFF;
1723 eui[4] = dev->dev_id & 0xFF;
1724 } else {
1725 eui[3] = 0xFF;
1726 eui[4] = 0xFE;
1727 eui[0] ^= 2;
1728 }
1729 return 0;
1730 }
1731
1732 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1733 {
1734 if (dev->addr_len != IEEE802154_ADDR_LEN)
1735 return -1;
1736 memcpy(eui, dev->dev_addr, 8);
1737 eui[0] ^= 2;
1738 return 0;
1739 }
1740
1741 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1742 {
1743 union fwnet_hwaddr *ha;
1744
1745 if (dev->addr_len != FWNET_ALEN)
1746 return -1;
1747
1748 ha = (union fwnet_hwaddr *)dev->dev_addr;
1749
1750 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1751 eui[0] ^= 2;
1752 return 0;
1753 }
1754
1755 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1756 {
1757 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1758 if (dev->addr_len != ARCNET_ALEN)
1759 return -1;
1760 memset(eui, 0, 7);
1761 eui[7] = *(u8 *)dev->dev_addr;
1762 return 0;
1763 }
1764
1765 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1766 {
1767 if (dev->addr_len != INFINIBAND_ALEN)
1768 return -1;
1769 memcpy(eui, dev->dev_addr + 12, 8);
1770 eui[0] |= 2;
1771 return 0;
1772 }
1773
1774 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1775 {
1776 if (addr == 0)
1777 return -1;
1778 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1779 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1780 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1781 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1782 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1783 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1784 eui[1] = 0;
1785 eui[2] = 0x5E;
1786 eui[3] = 0xFE;
1787 memcpy(eui + 4, &addr, 4);
1788 return 0;
1789 }
1790
1791 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1792 {
1793 if (dev->priv_flags & IFF_ISATAP)
1794 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1795 return -1;
1796 }
1797
1798 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1799 {
1800 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1801 }
1802
1803 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1804 {
1805 switch (dev->type) {
1806 case ARPHRD_ETHER:
1807 case ARPHRD_FDDI:
1808 return addrconf_ifid_eui48(eui, dev);
1809 case ARPHRD_ARCNET:
1810 return addrconf_ifid_arcnet(eui, dev);
1811 case ARPHRD_INFINIBAND:
1812 return addrconf_ifid_infiniband(eui, dev);
1813 case ARPHRD_SIT:
1814 return addrconf_ifid_sit(eui, dev);
1815 case ARPHRD_IPGRE:
1816 return addrconf_ifid_gre(eui, dev);
1817 case ARPHRD_IEEE802154:
1818 return addrconf_ifid_eui64(eui, dev);
1819 case ARPHRD_IEEE1394:
1820 return addrconf_ifid_ieee1394(eui, dev);
1821 }
1822 return -1;
1823 }
1824
1825 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1826 {
1827 int err = -1;
1828 struct inet6_ifaddr *ifp;
1829
1830 read_lock_bh(&idev->lock);
1831 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1832 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1833 memcpy(eui, ifp->addr.s6_addr+8, 8);
1834 err = 0;
1835 break;
1836 }
1837 }
1838 read_unlock_bh(&idev->lock);
1839 return err;
1840 }
1841
1842 #ifdef CONFIG_IPV6_PRIVACY
1843 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1844 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1845 {
1846 regen:
1847 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1848 idev->rndid[0] &= ~0x02;
1849
1850 /*
1851 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1852 * check if generated address is not inappropriate
1853 *
1854 * - Reserved subnet anycast (RFC 2526)
1855 * 11111101 11....11 1xxxxxxx
1856 * - ISATAP (RFC4214) 6.1
1857 * 00-00-5E-FE-xx-xx-xx-xx
1858 * - value 0
1859 * - XXX: already assigned to an address on the device
1860 */
1861 if (idev->rndid[0] == 0xfd &&
1862 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1863 (idev->rndid[7]&0x80))
1864 goto regen;
1865 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1866 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1867 goto regen;
1868 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1869 goto regen;
1870 }
1871 }
1872
1873 static void ipv6_regen_rndid(unsigned long data)
1874 {
1875 struct inet6_dev *idev = (struct inet6_dev *) data;
1876 unsigned long expires;
1877
1878 rcu_read_lock_bh();
1879 write_lock_bh(&idev->lock);
1880
1881 if (idev->dead)
1882 goto out;
1883
1884 __ipv6_regen_rndid(idev);
1885
1886 expires = jiffies +
1887 idev->cnf.temp_prefered_lft * HZ -
1888 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1889 idev->cnf.max_desync_factor * HZ;
1890 if (time_before(expires, jiffies)) {
1891 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1892 __func__, idev->dev->name);
1893 goto out;
1894 }
1895
1896 if (!mod_timer(&idev->regen_timer, expires))
1897 in6_dev_hold(idev);
1898
1899 out:
1900 write_unlock_bh(&idev->lock);
1901 rcu_read_unlock_bh();
1902 in6_dev_put(idev);
1903 }
1904
1905 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1906 {
1907 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1908 __ipv6_regen_rndid(idev);
1909 }
1910 #endif
1911
1912 /*
1913 * Add prefix route.
1914 */
1915
1916 static void
1917 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1918 unsigned long expires, u32 flags)
1919 {
1920 struct fib6_config cfg = {
1921 .fc_table = RT6_TABLE_PREFIX,
1922 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1923 .fc_ifindex = dev->ifindex,
1924 .fc_expires = expires,
1925 .fc_dst_len = plen,
1926 .fc_flags = RTF_UP | flags,
1927 .fc_nlinfo.nl_net = dev_net(dev),
1928 .fc_protocol = RTPROT_KERNEL,
1929 };
1930
1931 cfg.fc_dst = *pfx;
1932
1933 /* Prevent useless cloning on PtP SIT.
1934 This thing is done here expecting that the whole
1935 class of non-broadcast devices need not cloning.
1936 */
1937 #if IS_ENABLED(CONFIG_IPV6_SIT)
1938 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1939 cfg.fc_flags |= RTF_NONEXTHOP;
1940 #endif
1941
1942 ip6_route_add(&cfg);
1943 }
1944
1945
1946 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1947 int plen,
1948 const struct net_device *dev,
1949 u32 flags, u32 noflags)
1950 {
1951 struct fib6_node *fn;
1952 struct rt6_info *rt = NULL;
1953 struct fib6_table *table;
1954
1955 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1956 if (table == NULL)
1957 return NULL;
1958
1959 read_lock_bh(&table->tb6_lock);
1960 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1961 if (!fn)
1962 goto out;
1963 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1964 if (rt->dst.dev->ifindex != dev->ifindex)
1965 continue;
1966 if ((rt->rt6i_flags & flags) != flags)
1967 continue;
1968 if ((rt->rt6i_flags & noflags) != 0)
1969 continue;
1970 dst_hold(&rt->dst);
1971 break;
1972 }
1973 out:
1974 read_unlock_bh(&table->tb6_lock);
1975 return rt;
1976 }
1977
1978
1979 /* Create "default" multicast route to the interface */
1980
1981 static void addrconf_add_mroute(struct net_device *dev)
1982 {
1983 struct fib6_config cfg = {
1984 .fc_table = RT6_TABLE_LOCAL,
1985 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1986 .fc_ifindex = dev->ifindex,
1987 .fc_dst_len = 8,
1988 .fc_flags = RTF_UP,
1989 .fc_nlinfo.nl_net = dev_net(dev),
1990 };
1991
1992 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1993
1994 ip6_route_add(&cfg);
1995 }
1996
1997 #if IS_ENABLED(CONFIG_IPV6_SIT)
1998 static void sit_route_add(struct net_device *dev)
1999 {
2000 struct fib6_config cfg = {
2001 .fc_table = RT6_TABLE_MAIN,
2002 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2003 .fc_ifindex = dev->ifindex,
2004 .fc_dst_len = 96,
2005 .fc_flags = RTF_UP | RTF_NONEXTHOP,
2006 .fc_nlinfo.nl_net = dev_net(dev),
2007 };
2008
2009 /* prefix length - 96 bits "::d.d.d.d" */
2010 ip6_route_add(&cfg);
2011 }
2012 #endif
2013
2014 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2015 {
2016 struct inet6_dev *idev;
2017
2018 ASSERT_RTNL();
2019
2020 idev = ipv6_find_idev(dev);
2021 if (!idev)
2022 return ERR_PTR(-ENOBUFS);
2023
2024 if (idev->cnf.disable_ipv6)
2025 return ERR_PTR(-EACCES);
2026
2027 /* Add default multicast route */
2028 if (!(dev->flags & IFF_LOOPBACK))
2029 addrconf_add_mroute(dev);
2030
2031 return idev;
2032 }
2033
2034 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2035 {
2036 struct prefix_info *pinfo;
2037 __u32 valid_lft;
2038 __u32 prefered_lft;
2039 int addr_type;
2040 struct inet6_dev *in6_dev;
2041 struct net *net = dev_net(dev);
2042
2043 pinfo = (struct prefix_info *) opt;
2044
2045 if (len < sizeof(struct prefix_info)) {
2046 ADBG(("addrconf: prefix option too short\n"));
2047 return;
2048 }
2049
2050 /*
2051 * Validation checks ([ADDRCONF], page 19)
2052 */
2053
2054 addr_type = ipv6_addr_type(&pinfo->prefix);
2055
2056 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2057 return;
2058
2059 valid_lft = ntohl(pinfo->valid);
2060 prefered_lft = ntohl(pinfo->prefered);
2061
2062 if (prefered_lft > valid_lft) {
2063 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2064 return;
2065 }
2066
2067 in6_dev = in6_dev_get(dev);
2068
2069 if (in6_dev == NULL) {
2070 net_dbg_ratelimited("addrconf: device %s not configured\n",
2071 dev->name);
2072 return;
2073 }
2074
2075 /*
2076 * Two things going on here:
2077 * 1) Add routes for on-link prefixes
2078 * 2) Configure prefixes with the auto flag set
2079 */
2080
2081 if (pinfo->onlink) {
2082 struct rt6_info *rt;
2083 unsigned long rt_expires;
2084
2085 /* Avoid arithmetic overflow. Really, we could
2086 * save rt_expires in seconds, likely valid_lft,
2087 * but it would require division in fib gc, that it
2088 * not good.
2089 */
2090 if (HZ > USER_HZ)
2091 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2092 else
2093 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2094
2095 if (addrconf_finite_timeout(rt_expires))
2096 rt_expires *= HZ;
2097
2098 rt = addrconf_get_prefix_route(&pinfo->prefix,
2099 pinfo->prefix_len,
2100 dev,
2101 RTF_ADDRCONF | RTF_PREFIX_RT,
2102 RTF_GATEWAY | RTF_DEFAULT);
2103
2104 if (rt) {
2105 /* Autoconf prefix route */
2106 if (valid_lft == 0) {
2107 ip6_del_rt(rt);
2108 rt = NULL;
2109 } else if (addrconf_finite_timeout(rt_expires)) {
2110 /* not infinity */
2111 rt6_set_expires(rt, jiffies + rt_expires);
2112 } else {
2113 rt6_clean_expires(rt);
2114 }
2115 } else if (valid_lft) {
2116 clock_t expires = 0;
2117 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2118 if (addrconf_finite_timeout(rt_expires)) {
2119 /* not infinity */
2120 flags |= RTF_EXPIRES;
2121 expires = jiffies_to_clock_t(rt_expires);
2122 }
2123 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2124 dev, expires, flags);
2125 }
2126 ip6_rt_put(rt);
2127 }
2128
2129 /* Try to figure out our local address for this prefix */
2130
2131 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2132 struct inet6_ifaddr *ifp;
2133 struct in6_addr addr;
2134 int create = 0, update_lft = 0;
2135 bool tokenized = false;
2136
2137 if (pinfo->prefix_len == 64) {
2138 memcpy(&addr, &pinfo->prefix, 8);
2139
2140 if (!ipv6_addr_any(&in6_dev->token)) {
2141 read_lock_bh(&in6_dev->lock);
2142 memcpy(addr.s6_addr + 8,
2143 in6_dev->token.s6_addr + 8, 8);
2144 read_unlock_bh(&in6_dev->lock);
2145 tokenized = true;
2146 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2147 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2148 in6_dev_put(in6_dev);
2149 return;
2150 }
2151 goto ok;
2152 }
2153 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2154 pinfo->prefix_len);
2155 in6_dev_put(in6_dev);
2156 return;
2157
2158 ok:
2159
2160 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2161
2162 if (ifp == NULL && valid_lft) {
2163 int max_addresses = in6_dev->cnf.max_addresses;
2164 u32 addr_flags = 0;
2165
2166 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2167 if (in6_dev->cnf.optimistic_dad &&
2168 !net->ipv6.devconf_all->forwarding && sllao)
2169 addr_flags = IFA_F_OPTIMISTIC;
2170 #endif
2171
2172 /* Do not allow to create too much of autoconfigured
2173 * addresses; this would be too easy way to crash kernel.
2174 */
2175 if (!max_addresses ||
2176 ipv6_count_addresses(in6_dev) < max_addresses)
2177 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
2178 addr_type&IPV6_ADDR_SCOPE_MASK,
2179 addr_flags);
2180
2181 if (IS_ERR_OR_NULL(ifp)) {
2182 in6_dev_put(in6_dev);
2183 return;
2184 }
2185
2186 update_lft = create = 1;
2187 ifp->cstamp = jiffies;
2188 ifp->tokenized = tokenized;
2189 addrconf_dad_start(ifp);
2190 }
2191
2192 if (ifp) {
2193 int flags;
2194 unsigned long now;
2195 #ifdef CONFIG_IPV6_PRIVACY
2196 struct inet6_ifaddr *ift;
2197 #endif
2198 u32 stored_lft;
2199
2200 /* update lifetime (RFC2462 5.5.3 e) */
2201 spin_lock(&ifp->lock);
2202 now = jiffies;
2203 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2204 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2205 else
2206 stored_lft = 0;
2207 if (!update_lft && stored_lft) {
2208 if (valid_lft > MIN_VALID_LIFETIME ||
2209 valid_lft > stored_lft)
2210 update_lft = 1;
2211 else if (stored_lft <= MIN_VALID_LIFETIME) {
2212 /* valid_lft <= stored_lft is always true */
2213 /*
2214 * RFC 4862 Section 5.5.3e:
2215 * "Note that the preferred lifetime of
2216 * the corresponding address is always
2217 * reset to the Preferred Lifetime in
2218 * the received Prefix Information
2219 * option, regardless of whether the
2220 * valid lifetime is also reset or
2221 * ignored."
2222 *
2223 * So if the preferred lifetime in
2224 * this advertisement is different
2225 * than what we have stored, but the
2226 * valid lifetime is invalid, just
2227 * reset prefered_lft.
2228 *
2229 * We must set the valid lifetime
2230 * to the stored lifetime since we'll
2231 * be updating the timestamp below,
2232 * else we'll set it back to the
2233 * minimum.
2234 */
2235 if (prefered_lft != ifp->prefered_lft) {
2236 valid_lft = stored_lft;
2237 update_lft = 1;
2238 }
2239 } else {
2240 valid_lft = MIN_VALID_LIFETIME;
2241 if (valid_lft < prefered_lft)
2242 prefered_lft = valid_lft;
2243 update_lft = 1;
2244 }
2245 }
2246
2247 if (update_lft) {
2248 ifp->valid_lft = valid_lft;
2249 ifp->prefered_lft = prefered_lft;
2250 ifp->tstamp = now;
2251 flags = ifp->flags;
2252 ifp->flags &= ~IFA_F_DEPRECATED;
2253 spin_unlock(&ifp->lock);
2254
2255 if (!(flags&IFA_F_TENTATIVE))
2256 ipv6_ifa_notify(0, ifp);
2257 } else
2258 spin_unlock(&ifp->lock);
2259
2260 #ifdef CONFIG_IPV6_PRIVACY
2261 read_lock_bh(&in6_dev->lock);
2262 /* update all temporary addresses in the list */
2263 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2264 tmp_list) {
2265 int age, max_valid, max_prefered;
2266
2267 if (ifp != ift->ifpub)
2268 continue;
2269
2270 /*
2271 * RFC 4941 section 3.3:
2272 * If a received option will extend the lifetime
2273 * of a public address, the lifetimes of
2274 * temporary addresses should be extended,
2275 * subject to the overall constraint that no
2276 * temporary addresses should ever remain
2277 * "valid" or "preferred" for a time longer than
2278 * (TEMP_VALID_LIFETIME) or
2279 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2280 * respectively.
2281 */
2282 age = (now - ift->cstamp) / HZ;
2283 max_valid = in6_dev->cnf.temp_valid_lft - age;
2284 if (max_valid < 0)
2285 max_valid = 0;
2286
2287 max_prefered = in6_dev->cnf.temp_prefered_lft -
2288 in6_dev->cnf.max_desync_factor -
2289 age;
2290 if (max_prefered < 0)
2291 max_prefered = 0;
2292
2293 if (valid_lft > max_valid)
2294 valid_lft = max_valid;
2295
2296 if (prefered_lft > max_prefered)
2297 prefered_lft = max_prefered;
2298
2299 spin_lock(&ift->lock);
2300 flags = ift->flags;
2301 ift->valid_lft = valid_lft;
2302 ift->prefered_lft = prefered_lft;
2303 ift->tstamp = now;
2304 if (prefered_lft > 0)
2305 ift->flags &= ~IFA_F_DEPRECATED;
2306
2307 spin_unlock(&ift->lock);
2308 if (!(flags&IFA_F_TENTATIVE))
2309 ipv6_ifa_notify(0, ift);
2310 }
2311
2312 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2313 /*
2314 * When a new public address is created as
2315 * described in [ADDRCONF], also create a new
2316 * temporary address. Also create a temporary
2317 * address if it's enabled but no temporary
2318 * address currently exists.
2319 */
2320 read_unlock_bh(&in6_dev->lock);
2321 ipv6_create_tempaddr(ifp, NULL);
2322 } else {
2323 read_unlock_bh(&in6_dev->lock);
2324 }
2325 #endif
2326 in6_ifa_put(ifp);
2327 addrconf_verify(0);
2328 }
2329 }
2330 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2331 in6_dev_put(in6_dev);
2332 }
2333
2334 /*
2335 * Set destination address.
2336 * Special case for SIT interfaces where we create a new "virtual"
2337 * device.
2338 */
2339 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2340 {
2341 struct in6_ifreq ireq;
2342 struct net_device *dev;
2343 int err = -EINVAL;
2344
2345 rtnl_lock();
2346
2347 err = -EFAULT;
2348 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2349 goto err_exit;
2350
2351 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2352
2353 err = -ENODEV;
2354 if (dev == NULL)
2355 goto err_exit;
2356
2357 #if IS_ENABLED(CONFIG_IPV6_SIT)
2358 if (dev->type == ARPHRD_SIT) {
2359 const struct net_device_ops *ops = dev->netdev_ops;
2360 struct ifreq ifr;
2361 struct ip_tunnel_parm p;
2362
2363 err = -EADDRNOTAVAIL;
2364 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2365 goto err_exit;
2366
2367 memset(&p, 0, sizeof(p));
2368 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2369 p.iph.saddr = 0;
2370 p.iph.version = 4;
2371 p.iph.ihl = 5;
2372 p.iph.protocol = IPPROTO_IPV6;
2373 p.iph.ttl = 64;
2374 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2375
2376 if (ops->ndo_do_ioctl) {
2377 mm_segment_t oldfs = get_fs();
2378
2379 set_fs(KERNEL_DS);
2380 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2381 set_fs(oldfs);
2382 } else
2383 err = -EOPNOTSUPP;
2384
2385 if (err == 0) {
2386 err = -ENOBUFS;
2387 dev = __dev_get_by_name(net, p.name);
2388 if (!dev)
2389 goto err_exit;
2390 err = dev_open(dev);
2391 }
2392 }
2393 #endif
2394
2395 err_exit:
2396 rtnl_unlock();
2397 return err;
2398 }
2399
2400 /*
2401 * Manual configuration of address on an interface
2402 */
2403 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2404 const struct in6_addr *peer_pfx,
2405 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2406 __u32 valid_lft)
2407 {
2408 struct inet6_ifaddr *ifp;
2409 struct inet6_dev *idev;
2410 struct net_device *dev;
2411 int scope;
2412 u32 flags;
2413 clock_t expires;
2414 unsigned long timeout;
2415
2416 ASSERT_RTNL();
2417
2418 if (plen > 128)
2419 return -EINVAL;
2420
2421 /* check the lifetime */
2422 if (!valid_lft || prefered_lft > valid_lft)
2423 return -EINVAL;
2424
2425 dev = __dev_get_by_index(net, ifindex);
2426 if (!dev)
2427 return -ENODEV;
2428
2429 idev = addrconf_add_dev(dev);
2430 if (IS_ERR(idev))
2431 return PTR_ERR(idev);
2432
2433 scope = ipv6_addr_scope(pfx);
2434
2435 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2436 if (addrconf_finite_timeout(timeout)) {
2437 expires = jiffies_to_clock_t(timeout * HZ);
2438 valid_lft = timeout;
2439 flags = RTF_EXPIRES;
2440 } else {
2441 expires = 0;
2442 flags = 0;
2443 ifa_flags |= IFA_F_PERMANENT;
2444 }
2445
2446 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2447 if (addrconf_finite_timeout(timeout)) {
2448 if (timeout == 0)
2449 ifa_flags |= IFA_F_DEPRECATED;
2450 prefered_lft = timeout;
2451 }
2452
2453 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2454
2455 if (!IS_ERR(ifp)) {
2456 spin_lock_bh(&ifp->lock);
2457 ifp->valid_lft = valid_lft;
2458 ifp->prefered_lft = prefered_lft;
2459 ifp->tstamp = jiffies;
2460 if (peer_pfx)
2461 ifp->peer_addr = *peer_pfx;
2462 spin_unlock_bh(&ifp->lock);
2463
2464 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2465 expires, flags);
2466 /*
2467 * Note that section 3.1 of RFC 4429 indicates
2468 * that the Optimistic flag should not be set for
2469 * manually configured addresses
2470 */
2471 addrconf_dad_start(ifp);
2472 in6_ifa_put(ifp);
2473 addrconf_verify(0);
2474 return 0;
2475 }
2476
2477 return PTR_ERR(ifp);
2478 }
2479
2480 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2481 unsigned int plen)
2482 {
2483 struct inet6_ifaddr *ifp;
2484 struct inet6_dev *idev;
2485 struct net_device *dev;
2486
2487 if (plen > 128)
2488 return -EINVAL;
2489
2490 dev = __dev_get_by_index(net, ifindex);
2491 if (!dev)
2492 return -ENODEV;
2493
2494 if ((idev = __in6_dev_get(dev)) == NULL)
2495 return -ENXIO;
2496
2497 read_lock_bh(&idev->lock);
2498 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2499 if (ifp->prefix_len == plen &&
2500 ipv6_addr_equal(pfx, &ifp->addr)) {
2501 in6_ifa_hold(ifp);
2502 read_unlock_bh(&idev->lock);
2503
2504 ipv6_del_addr(ifp);
2505
2506 /* If the last address is deleted administratively,
2507 disable IPv6 on this interface.
2508 */
2509 if (list_empty(&idev->addr_list))
2510 addrconf_ifdown(idev->dev, 1);
2511 return 0;
2512 }
2513 }
2514 read_unlock_bh(&idev->lock);
2515 return -EADDRNOTAVAIL;
2516 }
2517
2518
2519 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2520 {
2521 struct in6_ifreq ireq;
2522 int err;
2523
2524 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2525 return -EPERM;
2526
2527 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2528 return -EFAULT;
2529
2530 rtnl_lock();
2531 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2532 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2533 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2534 rtnl_unlock();
2535 return err;
2536 }
2537
2538 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2539 {
2540 struct in6_ifreq ireq;
2541 int err;
2542
2543 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2544 return -EPERM;
2545
2546 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2547 return -EFAULT;
2548
2549 rtnl_lock();
2550 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2551 ireq.ifr6_prefixlen);
2552 rtnl_unlock();
2553 return err;
2554 }
2555
2556 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2557 int plen, int scope)
2558 {
2559 struct inet6_ifaddr *ifp;
2560
2561 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2562 if (!IS_ERR(ifp)) {
2563 spin_lock_bh(&ifp->lock);
2564 ifp->flags &= ~IFA_F_TENTATIVE;
2565 spin_unlock_bh(&ifp->lock);
2566 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2567 in6_ifa_put(ifp);
2568 }
2569 }
2570
2571 #if IS_ENABLED(CONFIG_IPV6_SIT)
2572 static void sit_add_v4_addrs(struct inet6_dev *idev)
2573 {
2574 struct in6_addr addr;
2575 struct net_device *dev;
2576 struct net *net = dev_net(idev->dev);
2577 int scope;
2578
2579 ASSERT_RTNL();
2580
2581 memset(&addr, 0, sizeof(struct in6_addr));
2582 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2583
2584 if (idev->dev->flags&IFF_POINTOPOINT) {
2585 addr.s6_addr32[0] = htonl(0xfe800000);
2586 scope = IFA_LINK;
2587 } else {
2588 scope = IPV6_ADDR_COMPATv4;
2589 }
2590
2591 if (addr.s6_addr32[3]) {
2592 add_addr(idev, &addr, 128, scope);
2593 return;
2594 }
2595
2596 for_each_netdev(net, dev) {
2597 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2598 if (in_dev && (dev->flags & IFF_UP)) {
2599 struct in_ifaddr *ifa;
2600
2601 int flag = scope;
2602
2603 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2604 int plen;
2605
2606 addr.s6_addr32[3] = ifa->ifa_local;
2607
2608 if (ifa->ifa_scope == RT_SCOPE_LINK)
2609 continue;
2610 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2611 if (idev->dev->flags&IFF_POINTOPOINT)
2612 continue;
2613 flag |= IFA_HOST;
2614 }
2615 if (idev->dev->flags&IFF_POINTOPOINT)
2616 plen = 64;
2617 else
2618 plen = 96;
2619
2620 add_addr(idev, &addr, plen, flag);
2621 }
2622 }
2623 }
2624 }
2625 #endif
2626
2627 static void init_loopback(struct net_device *dev)
2628 {
2629 struct inet6_dev *idev;
2630 struct net_device *sp_dev;
2631 struct inet6_ifaddr *sp_ifa;
2632 struct rt6_info *sp_rt;
2633
2634 /* ::1 */
2635
2636 ASSERT_RTNL();
2637
2638 if ((idev = ipv6_find_idev(dev)) == NULL) {
2639 pr_debug("%s: add_dev failed\n", __func__);
2640 return;
2641 }
2642
2643 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2644
2645 /* Add routes to other interface's IPv6 addresses */
2646 for_each_netdev(dev_net(dev), sp_dev) {
2647 if (!strcmp(sp_dev->name, dev->name))
2648 continue;
2649
2650 idev = __in6_dev_get(sp_dev);
2651 if (!idev)
2652 continue;
2653
2654 read_lock_bh(&idev->lock);
2655 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2656
2657 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2658 continue;
2659
2660 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2661
2662 /* Failure cases are ignored */
2663 if (!IS_ERR(sp_rt)) {
2664 sp_ifa->rt = sp_rt;
2665 ip6_ins_rt(sp_rt);
2666 }
2667 }
2668 read_unlock_bh(&idev->lock);
2669 }
2670 }
2671
2672 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2673 {
2674 struct inet6_ifaddr *ifp;
2675 u32 addr_flags = IFA_F_PERMANENT;
2676
2677 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2678 if (idev->cnf.optimistic_dad &&
2679 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2680 addr_flags |= IFA_F_OPTIMISTIC;
2681 #endif
2682
2683
2684 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2685 if (!IS_ERR(ifp)) {
2686 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2687 addrconf_dad_start(ifp);
2688 in6_ifa_put(ifp);
2689 }
2690 }
2691
2692 static void addrconf_dev_config(struct net_device *dev)
2693 {
2694 struct in6_addr addr;
2695 struct inet6_dev *idev;
2696
2697 ASSERT_RTNL();
2698
2699 if ((dev->type != ARPHRD_ETHER) &&
2700 (dev->type != ARPHRD_FDDI) &&
2701 (dev->type != ARPHRD_ARCNET) &&
2702 (dev->type != ARPHRD_INFINIBAND) &&
2703 (dev->type != ARPHRD_IEEE802154) &&
2704 (dev->type != ARPHRD_IEEE1394)) {
2705 /* Alas, we support only Ethernet autoconfiguration. */
2706 return;
2707 }
2708
2709 idev = addrconf_add_dev(dev);
2710 if (IS_ERR(idev))
2711 return;
2712
2713 memset(&addr, 0, sizeof(struct in6_addr));
2714 addr.s6_addr32[0] = htonl(0xFE800000);
2715
2716 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2717 addrconf_add_linklocal(idev, &addr);
2718 }
2719
2720 #if IS_ENABLED(CONFIG_IPV6_SIT)
2721 static void addrconf_sit_config(struct net_device *dev)
2722 {
2723 struct inet6_dev *idev;
2724
2725 ASSERT_RTNL();
2726
2727 /*
2728 * Configure the tunnel with one of our IPv4
2729 * addresses... we should configure all of
2730 * our v4 addrs in the tunnel
2731 */
2732
2733 if ((idev = ipv6_find_idev(dev)) == NULL) {
2734 pr_debug("%s: add_dev failed\n", __func__);
2735 return;
2736 }
2737
2738 if (dev->priv_flags & IFF_ISATAP) {
2739 struct in6_addr addr;
2740
2741 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2742 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2743 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2744 addrconf_add_linklocal(idev, &addr);
2745 return;
2746 }
2747
2748 sit_add_v4_addrs(idev);
2749
2750 if (dev->flags&IFF_POINTOPOINT)
2751 addrconf_add_mroute(dev);
2752 else
2753 sit_route_add(dev);
2754 }
2755 #endif
2756
2757 #if IS_ENABLED(CONFIG_NET_IPGRE)
2758 static void addrconf_gre_config(struct net_device *dev)
2759 {
2760 struct inet6_dev *idev;
2761 struct in6_addr addr;
2762
2763 pr_info("%s(%s)\n", __func__, dev->name);
2764
2765 ASSERT_RTNL();
2766
2767 if ((idev = ipv6_find_idev(dev)) == NULL) {
2768 pr_debug("%s: add_dev failed\n", __func__);
2769 return;
2770 }
2771
2772 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2773 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2774
2775 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2776 addrconf_add_linklocal(idev, &addr);
2777 }
2778 #endif
2779
2780 static inline int
2781 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2782 {
2783 struct in6_addr lladdr;
2784
2785 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2786 addrconf_add_linklocal(idev, &lladdr);
2787 return 0;
2788 }
2789 return -1;
2790 }
2791
2792 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2793 {
2794 struct net_device *link_dev;
2795 struct net *net = dev_net(idev->dev);
2796
2797 /* first try to inherit the link-local address from the link device */
2798 if (idev->dev->iflink &&
2799 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2800 if (!ipv6_inherit_linklocal(idev, link_dev))
2801 return;
2802 }
2803 /* then try to inherit it from any device */
2804 for_each_netdev(net, link_dev) {
2805 if (!ipv6_inherit_linklocal(idev, link_dev))
2806 return;
2807 }
2808 pr_debug("init ip6-ip6: add_linklocal failed\n");
2809 }
2810
2811 /*
2812 * Autoconfigure tunnel with a link-local address so routing protocols,
2813 * DHCPv6, MLD etc. can be run over the virtual link
2814 */
2815
2816 static void addrconf_ip6_tnl_config(struct net_device *dev)
2817 {
2818 struct inet6_dev *idev;
2819
2820 ASSERT_RTNL();
2821
2822 idev = addrconf_add_dev(dev);
2823 if (IS_ERR(idev)) {
2824 pr_debug("init ip6-ip6: add_dev failed\n");
2825 return;
2826 }
2827 ip6_tnl_add_linklocal(idev);
2828 }
2829
2830 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2831 void *ptr)
2832 {
2833 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2834 struct inet6_dev *idev = __in6_dev_get(dev);
2835 int run_pending = 0;
2836 int err;
2837
2838 switch (event) {
2839 case NETDEV_REGISTER:
2840 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2841 idev = ipv6_add_dev(dev);
2842 if (!idev)
2843 return notifier_from_errno(-ENOMEM);
2844 }
2845 break;
2846
2847 case NETDEV_UP:
2848 case NETDEV_CHANGE:
2849 if (dev->flags & IFF_SLAVE)
2850 break;
2851
2852 if (event == NETDEV_UP) {
2853 if (!addrconf_qdisc_ok(dev)) {
2854 /* device is not ready yet. */
2855 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2856 dev->name);
2857 break;
2858 }
2859
2860 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2861 idev = ipv6_add_dev(dev);
2862
2863 if (idev) {
2864 idev->if_flags |= IF_READY;
2865 run_pending = 1;
2866 }
2867 } else {
2868 if (!addrconf_qdisc_ok(dev)) {
2869 /* device is still not ready. */
2870 break;
2871 }
2872
2873 if (idev) {
2874 if (idev->if_flags & IF_READY)
2875 /* device is already configured. */
2876 break;
2877 idev->if_flags |= IF_READY;
2878 }
2879
2880 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2881 dev->name);
2882
2883 run_pending = 1;
2884 }
2885
2886 switch (dev->type) {
2887 #if IS_ENABLED(CONFIG_IPV6_SIT)
2888 case ARPHRD_SIT:
2889 addrconf_sit_config(dev);
2890 break;
2891 #endif
2892 #if IS_ENABLED(CONFIG_NET_IPGRE)
2893 case ARPHRD_IPGRE:
2894 addrconf_gre_config(dev);
2895 break;
2896 #endif
2897 case ARPHRD_TUNNEL6:
2898 addrconf_ip6_tnl_config(dev);
2899 break;
2900 case ARPHRD_LOOPBACK:
2901 init_loopback(dev);
2902 break;
2903
2904 default:
2905 addrconf_dev_config(dev);
2906 break;
2907 }
2908
2909 if (idev) {
2910 if (run_pending)
2911 addrconf_dad_run(idev);
2912
2913 /*
2914 * If the MTU changed during the interface down,
2915 * when the interface up, the changed MTU must be
2916 * reflected in the idev as well as routers.
2917 */
2918 if (idev->cnf.mtu6 != dev->mtu &&
2919 dev->mtu >= IPV6_MIN_MTU) {
2920 rt6_mtu_change(dev, dev->mtu);
2921 idev->cnf.mtu6 = dev->mtu;
2922 }
2923 idev->tstamp = jiffies;
2924 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2925
2926 /*
2927 * If the changed mtu during down is lower than
2928 * IPV6_MIN_MTU stop IPv6 on this interface.
2929 */
2930 if (dev->mtu < IPV6_MIN_MTU)
2931 addrconf_ifdown(dev, 1);
2932 }
2933 break;
2934
2935 case NETDEV_CHANGEMTU:
2936 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2937 rt6_mtu_change(dev, dev->mtu);
2938 idev->cnf.mtu6 = dev->mtu;
2939 break;
2940 }
2941
2942 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2943 idev = ipv6_add_dev(dev);
2944 if (idev)
2945 break;
2946 }
2947
2948 /*
2949 * MTU falled under IPV6_MIN_MTU.
2950 * Stop IPv6 on this interface.
2951 */
2952
2953 case NETDEV_DOWN:
2954 case NETDEV_UNREGISTER:
2955 /*
2956 * Remove all addresses from this interface.
2957 */
2958 addrconf_ifdown(dev, event != NETDEV_DOWN);
2959 break;
2960
2961 case NETDEV_CHANGENAME:
2962 if (idev) {
2963 snmp6_unregister_dev(idev);
2964 addrconf_sysctl_unregister(idev);
2965 addrconf_sysctl_register(idev);
2966 err = snmp6_register_dev(idev);
2967 if (err)
2968 return notifier_from_errno(err);
2969 }
2970 break;
2971
2972 case NETDEV_PRE_TYPE_CHANGE:
2973 case NETDEV_POST_TYPE_CHANGE:
2974 addrconf_type_change(dev, event);
2975 break;
2976 }
2977
2978 return NOTIFY_OK;
2979 }
2980
2981 /*
2982 * addrconf module should be notified of a device going up
2983 */
2984 static struct notifier_block ipv6_dev_notf = {
2985 .notifier_call = addrconf_notify,
2986 };
2987
2988 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2989 {
2990 struct inet6_dev *idev;
2991 ASSERT_RTNL();
2992
2993 idev = __in6_dev_get(dev);
2994
2995 if (event == NETDEV_POST_TYPE_CHANGE)
2996 ipv6_mc_remap(idev);
2997 else if (event == NETDEV_PRE_TYPE_CHANGE)
2998 ipv6_mc_unmap(idev);
2999 }
3000
3001 static int addrconf_ifdown(struct net_device *dev, int how)
3002 {
3003 struct net *net = dev_net(dev);
3004 struct inet6_dev *idev;
3005 struct inet6_ifaddr *ifa;
3006 int state, i;
3007
3008 ASSERT_RTNL();
3009
3010 rt6_ifdown(net, dev);
3011 neigh_ifdown(&nd_tbl, dev);
3012
3013 idev = __in6_dev_get(dev);
3014 if (idev == NULL)
3015 return -ENODEV;
3016
3017 /*
3018 * Step 1: remove reference to ipv6 device from parent device.
3019 * Do not dev_put!
3020 */
3021 if (how) {
3022 idev->dead = 1;
3023
3024 /* protected by rtnl_lock */
3025 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3026
3027 /* Step 1.5: remove snmp6 entry */
3028 snmp6_unregister_dev(idev);
3029
3030 }
3031
3032 /* Step 2: clear hash table */
3033 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3034 struct hlist_head *h = &inet6_addr_lst[i];
3035
3036 spin_lock_bh(&addrconf_hash_lock);
3037 restart:
3038 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3039 if (ifa->idev == idev) {
3040 hlist_del_init_rcu(&ifa->addr_lst);
3041 addrconf_del_timer(ifa);
3042 goto restart;
3043 }
3044 }
3045 spin_unlock_bh(&addrconf_hash_lock);
3046 }
3047
3048 write_lock_bh(&idev->lock);
3049
3050 /* Step 2: clear flags for stateless addrconf */
3051 if (!how)
3052 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3053
3054 #ifdef CONFIG_IPV6_PRIVACY
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 #endif
3075
3076 while (!list_empty(&idev->addr_list)) {
3077 ifa = list_first_entry(&idev->addr_list,
3078 struct inet6_ifaddr, if_list);
3079 addrconf_del_timer(ifa);
3080
3081 list_del(&ifa->if_list);
3082
3083 write_unlock_bh(&idev->lock);
3084
3085 spin_lock_bh(&ifa->state_lock);
3086 state = ifa->state;
3087 ifa->state = INET6_IFADDR_STATE_DEAD;
3088 spin_unlock_bh(&ifa->state_lock);
3089
3090 if (state != INET6_IFADDR_STATE_DEAD) {
3091 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3092 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3093 }
3094 in6_ifa_put(ifa);
3095
3096 write_lock_bh(&idev->lock);
3097 }
3098
3099 write_unlock_bh(&idev->lock);
3100
3101 /* Step 5: Discard multicast list */
3102 if (how)
3103 ipv6_mc_destroy_dev(idev);
3104 else
3105 ipv6_mc_down(idev);
3106
3107 idev->tstamp = jiffies;
3108
3109 /* Last: Shot the device (if unregistered) */
3110 if (how) {
3111 addrconf_sysctl_unregister(idev);
3112 neigh_parms_release(&nd_tbl, idev->nd_parms);
3113 neigh_ifdown(&nd_tbl, dev);
3114 in6_dev_put(idev);
3115 }
3116 return 0;
3117 }
3118
3119 static void addrconf_rs_timer(unsigned long data)
3120 {
3121 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3122 struct inet6_dev *idev = ifp->idev;
3123
3124 read_lock(&idev->lock);
3125 if (idev->dead || !(idev->if_flags & IF_READY))
3126 goto out;
3127
3128 if (!ipv6_accept_ra(idev))
3129 goto out;
3130
3131 /* Announcement received after solicitation was sent */
3132 if (idev->if_flags & IF_RA_RCVD)
3133 goto out;
3134
3135 spin_lock(&ifp->lock);
3136 if (ifp->probes++ < idev->cnf.rtr_solicits) {
3137 /* The wait after the last probe can be shorter */
3138 addrconf_mod_timer(ifp, AC_RS,
3139 (ifp->probes == idev->cnf.rtr_solicits) ?
3140 idev->cnf.rtr_solicit_delay :
3141 idev->cnf.rtr_solicit_interval);
3142 spin_unlock(&ifp->lock);
3143
3144 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3145 } else {
3146 spin_unlock(&ifp->lock);
3147 /*
3148 * Note: we do not support deprecated "all on-link"
3149 * assumption any longer.
3150 */
3151 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3152 }
3153
3154 out:
3155 read_unlock(&idev->lock);
3156 in6_ifa_put(ifp);
3157 }
3158
3159 /*
3160 * Duplicate Address Detection
3161 */
3162 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3163 {
3164 unsigned long rand_num;
3165 struct inet6_dev *idev = ifp->idev;
3166
3167 if (ifp->flags & IFA_F_OPTIMISTIC)
3168 rand_num = 0;
3169 else
3170 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3171
3172 ifp->probes = idev->cnf.dad_transmits;
3173 addrconf_mod_timer(ifp, AC_DAD, rand_num);
3174 }
3175
3176 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3177 {
3178 struct inet6_dev *idev = ifp->idev;
3179 struct net_device *dev = idev->dev;
3180
3181 addrconf_join_solict(dev, &ifp->addr);
3182
3183 net_srandom(ifp->addr.s6_addr32[3]);
3184
3185 read_lock_bh(&idev->lock);
3186 spin_lock(&ifp->lock);
3187 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3188 goto out;
3189
3190 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3191 idev->cnf.accept_dad < 1 ||
3192 !(ifp->flags&IFA_F_TENTATIVE) ||
3193 ifp->flags & IFA_F_NODAD) {
3194 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3195 spin_unlock(&ifp->lock);
3196 read_unlock_bh(&idev->lock);
3197
3198 addrconf_dad_completed(ifp);
3199 return;
3200 }
3201
3202 if (!(idev->if_flags & IF_READY)) {
3203 spin_unlock(&ifp->lock);
3204 read_unlock_bh(&idev->lock);
3205 /*
3206 * If the device is not ready:
3207 * - keep it tentative if it is a permanent address.
3208 * - otherwise, kill it.
3209 */
3210 in6_ifa_hold(ifp);
3211 addrconf_dad_stop(ifp, 0);
3212 return;
3213 }
3214
3215 /*
3216 * Optimistic nodes can start receiving
3217 * Frames right away
3218 */
3219 if (ifp->flags & IFA_F_OPTIMISTIC)
3220 ip6_ins_rt(ifp->rt);
3221
3222 addrconf_dad_kick(ifp);
3223 out:
3224 spin_unlock(&ifp->lock);
3225 read_unlock_bh(&idev->lock);
3226 }
3227
3228 static void addrconf_dad_timer(unsigned long data)
3229 {
3230 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3231 struct inet6_dev *idev = ifp->idev;
3232 struct in6_addr mcaddr;
3233
3234 if (!ifp->probes && addrconf_dad_end(ifp))
3235 goto out;
3236
3237 read_lock(&idev->lock);
3238 if (idev->dead || !(idev->if_flags & IF_READY)) {
3239 read_unlock(&idev->lock);
3240 goto out;
3241 }
3242
3243 spin_lock(&ifp->lock);
3244 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3245 spin_unlock(&ifp->lock);
3246 read_unlock(&idev->lock);
3247 goto out;
3248 }
3249
3250 if (ifp->probes == 0) {
3251 /*
3252 * DAD was successful
3253 */
3254
3255 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3256 spin_unlock(&ifp->lock);
3257 read_unlock(&idev->lock);
3258
3259 addrconf_dad_completed(ifp);
3260
3261 goto out;
3262 }
3263
3264 ifp->probes--;
3265 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3266 spin_unlock(&ifp->lock);
3267 read_unlock(&idev->lock);
3268
3269 /* send a neighbour solicitation for our addr */
3270 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3271 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3272 out:
3273 in6_ifa_put(ifp);
3274 }
3275
3276 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3277 {
3278 struct net_device *dev = ifp->idev->dev;
3279
3280 /*
3281 * Configure the address for reception. Now it is valid.
3282 */
3283
3284 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3285
3286 /* If added prefix is link local and we are prepared to process
3287 router advertisements, start sending router solicitations.
3288 */
3289
3290 if (ipv6_accept_ra(ifp->idev) &&
3291 ifp->idev->cnf.rtr_solicits > 0 &&
3292 (dev->flags&IFF_LOOPBACK) == 0 &&
3293 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3294 /*
3295 * If a host as already performed a random delay
3296 * [...] as part of DAD [...] there is no need
3297 * to delay again before sending the first RS
3298 */
3299 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3300
3301 spin_lock_bh(&ifp->lock);
3302 ifp->probes = 1;
3303 ifp->idev->if_flags |= IF_RS_SENT;
3304 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3305 spin_unlock_bh(&ifp->lock);
3306 }
3307 }
3308
3309 static void addrconf_dad_run(struct inet6_dev *idev)
3310 {
3311 struct inet6_ifaddr *ifp;
3312
3313 read_lock_bh(&idev->lock);
3314 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3315 spin_lock(&ifp->lock);
3316 if (ifp->flags & IFA_F_TENTATIVE &&
3317 ifp->state == INET6_IFADDR_STATE_DAD)
3318 addrconf_dad_kick(ifp);
3319 spin_unlock(&ifp->lock);
3320 }
3321 read_unlock_bh(&idev->lock);
3322 }
3323
3324 #ifdef CONFIG_PROC_FS
3325 struct if6_iter_state {
3326 struct seq_net_private p;
3327 int bucket;
3328 int offset;
3329 };
3330
3331 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3332 {
3333 struct inet6_ifaddr *ifa = NULL;
3334 struct if6_iter_state *state = seq->private;
3335 struct net *net = seq_file_net(seq);
3336 int p = 0;
3337
3338 /* initial bucket if pos is 0 */
3339 if (pos == 0) {
3340 state->bucket = 0;
3341 state->offset = 0;
3342 }
3343
3344 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3345 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3346 addr_lst) {
3347 if (!net_eq(dev_net(ifa->idev->dev), net))
3348 continue;
3349 /* sync with offset */
3350 if (p < state->offset) {
3351 p++;
3352 continue;
3353 }
3354 state->offset++;
3355 return ifa;
3356 }
3357
3358 /* prepare for next bucket */
3359 state->offset = 0;
3360 p = 0;
3361 }
3362 return NULL;
3363 }
3364
3365 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3366 struct inet6_ifaddr *ifa)
3367 {
3368 struct if6_iter_state *state = seq->private;
3369 struct net *net = seq_file_net(seq);
3370
3371 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3372 if (!net_eq(dev_net(ifa->idev->dev), net))
3373 continue;
3374 state->offset++;
3375 return ifa;
3376 }
3377
3378 while (++state->bucket < IN6_ADDR_HSIZE) {
3379 state->offset = 0;
3380 hlist_for_each_entry_rcu_bh(ifa,
3381 &inet6_addr_lst[state->bucket], addr_lst) {
3382 if (!net_eq(dev_net(ifa->idev->dev), net))
3383 continue;
3384 state->offset++;
3385 return ifa;
3386 }
3387 }
3388
3389 return NULL;
3390 }
3391
3392 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3393 __acquires(rcu_bh)
3394 {
3395 rcu_read_lock_bh();
3396 return if6_get_first(seq, *pos);
3397 }
3398
3399 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3400 {
3401 struct inet6_ifaddr *ifa;
3402
3403 ifa = if6_get_next(seq, v);
3404 ++*pos;
3405 return ifa;
3406 }
3407
3408 static void if6_seq_stop(struct seq_file *seq, void *v)
3409 __releases(rcu_bh)
3410 {
3411 rcu_read_unlock_bh();
3412 }
3413
3414 static int if6_seq_show(struct seq_file *seq, void *v)
3415 {
3416 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3417 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3418 &ifp->addr,
3419 ifp->idev->dev->ifindex,
3420 ifp->prefix_len,
3421 ifp->scope,
3422 ifp->flags,
3423 ifp->idev->dev->name);
3424 return 0;
3425 }
3426
3427 static const struct seq_operations if6_seq_ops = {
3428 .start = if6_seq_start,
3429 .next = if6_seq_next,
3430 .show = if6_seq_show,
3431 .stop = if6_seq_stop,
3432 };
3433
3434 static int if6_seq_open(struct inode *inode, struct file *file)
3435 {
3436 return seq_open_net(inode, file, &if6_seq_ops,
3437 sizeof(struct if6_iter_state));
3438 }
3439
3440 static const struct file_operations if6_fops = {
3441 .owner = THIS_MODULE,
3442 .open = if6_seq_open,
3443 .read = seq_read,
3444 .llseek = seq_lseek,
3445 .release = seq_release_net,
3446 };
3447
3448 static int __net_init if6_proc_net_init(struct net *net)
3449 {
3450 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3451 return -ENOMEM;
3452 return 0;
3453 }
3454
3455 static void __net_exit if6_proc_net_exit(struct net *net)
3456 {
3457 remove_proc_entry("if_inet6", net->proc_net);
3458 }
3459
3460 static struct pernet_operations if6_proc_net_ops = {
3461 .init = if6_proc_net_init,
3462 .exit = if6_proc_net_exit,
3463 };
3464
3465 int __init if6_proc_init(void)
3466 {
3467 return register_pernet_subsys(&if6_proc_net_ops);
3468 }
3469
3470 void if6_proc_exit(void)
3471 {
3472 unregister_pernet_subsys(&if6_proc_net_ops);
3473 }
3474 #endif /* CONFIG_PROC_FS */
3475
3476 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3477 /* Check if address is a home address configured on any interface. */
3478 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3479 {
3480 int ret = 0;
3481 struct inet6_ifaddr *ifp = NULL;
3482 unsigned int hash = inet6_addr_hash(addr);
3483
3484 rcu_read_lock_bh();
3485 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3486 if (!net_eq(dev_net(ifp->idev->dev), net))
3487 continue;
3488 if (ipv6_addr_equal(&ifp->addr, addr) &&
3489 (ifp->flags & IFA_F_HOMEADDRESS)) {
3490 ret = 1;
3491 break;
3492 }
3493 }
3494 rcu_read_unlock_bh();
3495 return ret;
3496 }
3497 #endif
3498
3499 /*
3500 * Periodic address status verification
3501 */
3502
3503 static void addrconf_verify(unsigned long foo)
3504 {
3505 unsigned long now, next, next_sec, next_sched;
3506 struct inet6_ifaddr *ifp;
3507 int i;
3508
3509 rcu_read_lock_bh();
3510 spin_lock(&addrconf_verify_lock);
3511 now = jiffies;
3512 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3513
3514 del_timer(&addr_chk_timer);
3515
3516 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3517 restart:
3518 hlist_for_each_entry_rcu_bh(ifp,
3519 &inet6_addr_lst[i], addr_lst) {
3520 unsigned long age;
3521
3522 if (ifp->flags & IFA_F_PERMANENT)
3523 continue;
3524
3525 spin_lock(&ifp->lock);
3526 /* We try to batch several events at once. */
3527 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3528
3529 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3530 age >= ifp->valid_lft) {
3531 spin_unlock(&ifp->lock);
3532 in6_ifa_hold(ifp);
3533 ipv6_del_addr(ifp);
3534 goto restart;
3535 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3536 spin_unlock(&ifp->lock);
3537 continue;
3538 } else if (age >= ifp->prefered_lft) {
3539 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3540 int deprecate = 0;
3541
3542 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3543 deprecate = 1;
3544 ifp->flags |= IFA_F_DEPRECATED;
3545 }
3546
3547 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3548 next = ifp->tstamp + ifp->valid_lft * HZ;
3549
3550 spin_unlock(&ifp->lock);
3551
3552 if (deprecate) {
3553 in6_ifa_hold(ifp);
3554
3555 ipv6_ifa_notify(0, ifp);
3556 in6_ifa_put(ifp);
3557 goto restart;
3558 }
3559 #ifdef CONFIG_IPV6_PRIVACY
3560 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3561 !(ifp->flags&IFA_F_TENTATIVE)) {
3562 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3563 ifp->idev->cnf.dad_transmits *
3564 ifp->idev->nd_parms->retrans_time / HZ;
3565
3566 if (age >= ifp->prefered_lft - regen_advance) {
3567 struct inet6_ifaddr *ifpub = ifp->ifpub;
3568 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3569 next = ifp->tstamp + ifp->prefered_lft * HZ;
3570 if (!ifp->regen_count && ifpub) {
3571 ifp->regen_count++;
3572 in6_ifa_hold(ifp);
3573 in6_ifa_hold(ifpub);
3574 spin_unlock(&ifp->lock);
3575
3576 spin_lock(&ifpub->lock);
3577 ifpub->regen_count = 0;
3578 spin_unlock(&ifpub->lock);
3579 ipv6_create_tempaddr(ifpub, ifp);
3580 in6_ifa_put(ifpub);
3581 in6_ifa_put(ifp);
3582 goto restart;
3583 }
3584 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3585 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3586 spin_unlock(&ifp->lock);
3587 #endif
3588 } else {
3589 /* ifp->prefered_lft <= ifp->valid_lft */
3590 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3591 next = ifp->tstamp + ifp->prefered_lft * HZ;
3592 spin_unlock(&ifp->lock);
3593 }
3594 }
3595 }
3596
3597 next_sec = round_jiffies_up(next);
3598 next_sched = next;
3599
3600 /* If rounded timeout is accurate enough, accept it. */
3601 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3602 next_sched = next_sec;
3603
3604 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3605 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3606 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3607
3608 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3609 now, next, next_sec, next_sched));
3610
3611 addr_chk_timer.expires = next_sched;
3612 add_timer(&addr_chk_timer);
3613 spin_unlock(&addrconf_verify_lock);
3614 rcu_read_unlock_bh();
3615 }
3616
3617 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3618 struct in6_addr **peer_pfx)
3619 {
3620 struct in6_addr *pfx = NULL;
3621
3622 *peer_pfx = NULL;
3623
3624 if (addr)
3625 pfx = nla_data(addr);
3626
3627 if (local) {
3628 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3629 *peer_pfx = pfx;
3630 pfx = nla_data(local);
3631 }
3632
3633 return pfx;
3634 }
3635
3636 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3637 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3638 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3639 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3640 };
3641
3642 static int
3643 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3644 {
3645 struct net *net = sock_net(skb->sk);
3646 struct ifaddrmsg *ifm;
3647 struct nlattr *tb[IFA_MAX+1];
3648 struct in6_addr *pfx, *peer_pfx;
3649 int err;
3650
3651 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3652 if (err < 0)
3653 return err;
3654
3655 ifm = nlmsg_data(nlh);
3656 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3657 if (pfx == NULL)
3658 return -EINVAL;
3659
3660 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3661 }
3662
3663 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3664 u32 prefered_lft, u32 valid_lft)
3665 {
3666 u32 flags;
3667 clock_t expires;
3668 unsigned long timeout;
3669
3670 if (!valid_lft || (prefered_lft > valid_lft))
3671 return -EINVAL;
3672
3673 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3674 if (addrconf_finite_timeout(timeout)) {
3675 expires = jiffies_to_clock_t(timeout * HZ);
3676 valid_lft = timeout;
3677 flags = RTF_EXPIRES;
3678 } else {
3679 expires = 0;
3680 flags = 0;
3681 ifa_flags |= IFA_F_PERMANENT;
3682 }
3683
3684 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3685 if (addrconf_finite_timeout(timeout)) {
3686 if (timeout == 0)
3687 ifa_flags |= IFA_F_DEPRECATED;
3688 prefered_lft = timeout;
3689 }
3690
3691 spin_lock_bh(&ifp->lock);
3692 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3693 ifp->tstamp = jiffies;
3694 ifp->valid_lft = valid_lft;
3695 ifp->prefered_lft = prefered_lft;
3696
3697 spin_unlock_bh(&ifp->lock);
3698 if (!(ifp->flags&IFA_F_TENTATIVE))
3699 ipv6_ifa_notify(0, ifp);
3700
3701 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3702 expires, flags);
3703 addrconf_verify(0);
3704
3705 return 0;
3706 }
3707
3708 static int
3709 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3710 {
3711 struct net *net = sock_net(skb->sk);
3712 struct ifaddrmsg *ifm;
3713 struct nlattr *tb[IFA_MAX+1];
3714 struct in6_addr *pfx, *peer_pfx;
3715 struct inet6_ifaddr *ifa;
3716 struct net_device *dev;
3717 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3718 u8 ifa_flags;
3719 int err;
3720
3721 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3722 if (err < 0)
3723 return err;
3724
3725 ifm = nlmsg_data(nlh);
3726 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3727 if (pfx == NULL)
3728 return -EINVAL;
3729
3730 if (tb[IFA_CACHEINFO]) {
3731 struct ifa_cacheinfo *ci;
3732
3733 ci = nla_data(tb[IFA_CACHEINFO]);
3734 valid_lft = ci->ifa_valid;
3735 preferred_lft = ci->ifa_prefered;
3736 } else {
3737 preferred_lft = INFINITY_LIFE_TIME;
3738 valid_lft = INFINITY_LIFE_TIME;
3739 }
3740
3741 dev = __dev_get_by_index(net, ifm->ifa_index);
3742 if (dev == NULL)
3743 return -ENODEV;
3744
3745 /* We ignore other flags so far. */
3746 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3747
3748 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3749 if (ifa == NULL) {
3750 /*
3751 * It would be best to check for !NLM_F_CREATE here but
3752 * userspace alreay relies on not having to provide this.
3753 */
3754 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3755 ifm->ifa_prefixlen, ifa_flags,
3756 preferred_lft, valid_lft);
3757 }
3758
3759 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3760 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3761 err = -EEXIST;
3762 else
3763 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3764
3765 in6_ifa_put(ifa);
3766
3767 return err;
3768 }
3769
3770 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3771 u8 scope, int ifindex)
3772 {
3773 struct ifaddrmsg *ifm;
3774
3775 ifm = nlmsg_data(nlh);
3776 ifm->ifa_family = AF_INET6;
3777 ifm->ifa_prefixlen = prefixlen;
3778 ifm->ifa_flags = flags;
3779 ifm->ifa_scope = scope;
3780 ifm->ifa_index = ifindex;
3781 }
3782
3783 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3784 unsigned long tstamp, u32 preferred, u32 valid)
3785 {
3786 struct ifa_cacheinfo ci;
3787
3788 ci.cstamp = cstamp_delta(cstamp);
3789 ci.tstamp = cstamp_delta(tstamp);
3790 ci.ifa_prefered = preferred;
3791 ci.ifa_valid = valid;
3792
3793 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3794 }
3795
3796 static inline int rt_scope(int ifa_scope)
3797 {
3798 if (ifa_scope & IFA_HOST)
3799 return RT_SCOPE_HOST;
3800 else if (ifa_scope & IFA_LINK)
3801 return RT_SCOPE_LINK;
3802 else if (ifa_scope & IFA_SITE)
3803 return RT_SCOPE_SITE;
3804 else
3805 return RT_SCOPE_UNIVERSE;
3806 }
3807
3808 static inline int inet6_ifaddr_msgsize(void)
3809 {
3810 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3811 + nla_total_size(16) /* IFA_LOCAL */
3812 + nla_total_size(16) /* IFA_ADDRESS */
3813 + nla_total_size(sizeof(struct ifa_cacheinfo));
3814 }
3815
3816 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3817 u32 portid, u32 seq, int event, unsigned int flags)
3818 {
3819 struct nlmsghdr *nlh;
3820 u32 preferred, valid;
3821
3822 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3823 if (nlh == NULL)
3824 return -EMSGSIZE;
3825
3826 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3827 ifa->idev->dev->ifindex);
3828
3829 if (!(ifa->flags&IFA_F_PERMANENT)) {
3830 preferred = ifa->prefered_lft;
3831 valid = ifa->valid_lft;
3832 if (preferred != INFINITY_LIFE_TIME) {
3833 long tval = (jiffies - ifa->tstamp)/HZ;
3834 if (preferred > tval)
3835 preferred -= tval;
3836 else
3837 preferred = 0;
3838 if (valid != INFINITY_LIFE_TIME) {
3839 if (valid > tval)
3840 valid -= tval;
3841 else
3842 valid = 0;
3843 }
3844 }
3845 } else {
3846 preferred = INFINITY_LIFE_TIME;
3847 valid = INFINITY_LIFE_TIME;
3848 }
3849
3850 if (!ipv6_addr_any(&ifa->peer_addr)) {
3851 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3852 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3853 goto error;
3854 } else
3855 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3856 goto error;
3857
3858 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3859 goto error;
3860
3861 return nlmsg_end(skb, nlh);
3862
3863 error:
3864 nlmsg_cancel(skb, nlh);
3865 return -EMSGSIZE;
3866 }
3867
3868 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3869 u32 portid, u32 seq, int event, u16 flags)
3870 {
3871 struct nlmsghdr *nlh;
3872 u8 scope = RT_SCOPE_UNIVERSE;
3873 int ifindex = ifmca->idev->dev->ifindex;
3874
3875 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3876 scope = RT_SCOPE_SITE;
3877
3878 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3879 if (nlh == NULL)
3880 return -EMSGSIZE;
3881
3882 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3883 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3884 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3885 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3886 nlmsg_cancel(skb, nlh);
3887 return -EMSGSIZE;
3888 }
3889
3890 return nlmsg_end(skb, nlh);
3891 }
3892
3893 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3894 u32 portid, u32 seq, int event, unsigned int flags)
3895 {
3896 struct nlmsghdr *nlh;
3897 u8 scope = RT_SCOPE_UNIVERSE;
3898 int ifindex = ifaca->aca_idev->dev->ifindex;
3899
3900 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3901 scope = RT_SCOPE_SITE;
3902
3903 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3904 if (nlh == NULL)
3905 return -EMSGSIZE;
3906
3907 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3908 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3909 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3910 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3911 nlmsg_cancel(skb, nlh);
3912 return -EMSGSIZE;
3913 }
3914
3915 return nlmsg_end(skb, nlh);
3916 }
3917
3918 enum addr_type_t {
3919 UNICAST_ADDR,
3920 MULTICAST_ADDR,
3921 ANYCAST_ADDR,
3922 };
3923
3924 /* called with rcu_read_lock() */
3925 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3926 struct netlink_callback *cb, enum addr_type_t type,
3927 int s_ip_idx, int *p_ip_idx)
3928 {
3929 struct ifmcaddr6 *ifmca;
3930 struct ifacaddr6 *ifaca;
3931 int err = 1;
3932 int ip_idx = *p_ip_idx;
3933
3934 read_lock_bh(&idev->lock);
3935 switch (type) {
3936 case UNICAST_ADDR: {
3937 struct inet6_ifaddr *ifa;
3938
3939 /* unicast address incl. temp addr */
3940 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3941 if (++ip_idx < s_ip_idx)
3942 continue;
3943 err = inet6_fill_ifaddr(skb, ifa,
3944 NETLINK_CB(cb->skb).portid,
3945 cb->nlh->nlmsg_seq,
3946 RTM_NEWADDR,
3947 NLM_F_MULTI);
3948 if (err <= 0)
3949 break;
3950 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3951 }
3952 break;
3953 }
3954 case MULTICAST_ADDR:
3955 /* multicast address */
3956 for (ifmca = idev->mc_list; ifmca;
3957 ifmca = ifmca->next, ip_idx++) {
3958 if (ip_idx < s_ip_idx)
3959 continue;
3960 err = inet6_fill_ifmcaddr(skb, ifmca,
3961 NETLINK_CB(cb->skb).portid,
3962 cb->nlh->nlmsg_seq,
3963 RTM_GETMULTICAST,
3964 NLM_F_MULTI);
3965 if (err <= 0)
3966 break;
3967 }
3968 break;
3969 case ANYCAST_ADDR:
3970 /* anycast address */
3971 for (ifaca = idev->ac_list; ifaca;
3972 ifaca = ifaca->aca_next, ip_idx++) {
3973 if (ip_idx < s_ip_idx)
3974 continue;
3975 err = inet6_fill_ifacaddr(skb, ifaca,
3976 NETLINK_CB(cb->skb).portid,
3977 cb->nlh->nlmsg_seq,
3978 RTM_GETANYCAST,
3979 NLM_F_MULTI);
3980 if (err <= 0)
3981 break;
3982 }
3983 break;
3984 default:
3985 break;
3986 }
3987 read_unlock_bh(&idev->lock);
3988 *p_ip_idx = ip_idx;
3989 return err;
3990 }
3991
3992 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3993 enum addr_type_t type)
3994 {
3995 struct net *net = sock_net(skb->sk);
3996 int h, s_h;
3997 int idx, ip_idx;
3998 int s_idx, s_ip_idx;
3999 struct net_device *dev;
4000 struct inet6_dev *idev;
4001 struct hlist_head *head;
4002
4003 s_h = cb->args[0];
4004 s_idx = idx = cb->args[1];
4005 s_ip_idx = ip_idx = cb->args[2];
4006
4007 rcu_read_lock();
4008 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4009 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4010 idx = 0;
4011 head = &net->dev_index_head[h];
4012 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4013 if (idx < s_idx)
4014 goto cont;
4015 if (h > s_h || idx > s_idx)
4016 s_ip_idx = 0;
4017 ip_idx = 0;
4018 idev = __in6_dev_get(dev);
4019 if (!idev)
4020 goto cont;
4021
4022 if (in6_dump_addrs(idev, skb, cb, type,
4023 s_ip_idx, &ip_idx) <= 0)
4024 goto done;
4025 cont:
4026 idx++;
4027 }
4028 }
4029 done:
4030 rcu_read_unlock();
4031 cb->args[0] = h;
4032 cb->args[1] = idx;
4033 cb->args[2] = ip_idx;
4034
4035 return skb->len;
4036 }
4037
4038 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4039 {
4040 enum addr_type_t type = UNICAST_ADDR;
4041
4042 return inet6_dump_addr(skb, cb, type);
4043 }
4044
4045 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4046 {
4047 enum addr_type_t type = MULTICAST_ADDR;
4048
4049 return inet6_dump_addr(skb, cb, type);
4050 }
4051
4052
4053 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4054 {
4055 enum addr_type_t type = ANYCAST_ADDR;
4056
4057 return inet6_dump_addr(skb, cb, type);
4058 }
4059
4060 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4061 {
4062 struct net *net = sock_net(in_skb->sk);
4063 struct ifaddrmsg *ifm;
4064 struct nlattr *tb[IFA_MAX+1];
4065 struct in6_addr *addr = NULL, *peer;
4066 struct net_device *dev = NULL;
4067 struct inet6_ifaddr *ifa;
4068 struct sk_buff *skb;
4069 int err;
4070
4071 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4072 if (err < 0)
4073 goto errout;
4074
4075 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4076 if (addr == NULL) {
4077 err = -EINVAL;
4078 goto errout;
4079 }
4080
4081 ifm = nlmsg_data(nlh);
4082 if (ifm->ifa_index)
4083 dev = __dev_get_by_index(net, ifm->ifa_index);
4084
4085 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4086 if (!ifa) {
4087 err = -EADDRNOTAVAIL;
4088 goto errout;
4089 }
4090
4091 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4092 if (!skb) {
4093 err = -ENOBUFS;
4094 goto errout_ifa;
4095 }
4096
4097 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4098 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4099 if (err < 0) {
4100 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4101 WARN_ON(err == -EMSGSIZE);
4102 kfree_skb(skb);
4103 goto errout_ifa;
4104 }
4105 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4106 errout_ifa:
4107 in6_ifa_put(ifa);
4108 errout:
4109 return err;
4110 }
4111
4112 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4113 {
4114 struct sk_buff *skb;
4115 struct net *net = dev_net(ifa->idev->dev);
4116 int err = -ENOBUFS;
4117
4118 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4119 if (skb == NULL)
4120 goto errout;
4121
4122 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4123 if (err < 0) {
4124 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4125 WARN_ON(err == -EMSGSIZE);
4126 kfree_skb(skb);
4127 goto errout;
4128 }
4129 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4130 return;
4131 errout:
4132 if (err < 0)
4133 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4134 }
4135
4136 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4137 __s32 *array, int bytes)
4138 {
4139 BUG_ON(bytes < (DEVCONF_MAX * 4));
4140
4141 memset(array, 0, bytes);
4142 array[DEVCONF_FORWARDING] = cnf->forwarding;
4143 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4144 array[DEVCONF_MTU6] = cnf->mtu6;
4145 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4146 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4147 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4148 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4149 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4150 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4151 jiffies_to_msecs(cnf->rtr_solicit_interval);
4152 array[DEVCONF_RTR_SOLICIT_DELAY] =
4153 jiffies_to_msecs(cnf->rtr_solicit_delay);
4154 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4155 #ifdef CONFIG_IPV6_PRIVACY
4156 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4157 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4158 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4159 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4160 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4161 #endif
4162 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4163 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4164 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4165 #ifdef CONFIG_IPV6_ROUTER_PREF
4166 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4167 array[DEVCONF_RTR_PROBE_INTERVAL] =
4168 jiffies_to_msecs(cnf->rtr_probe_interval);
4169 #ifdef CONFIG_IPV6_ROUTE_INFO
4170 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4171 #endif
4172 #endif
4173 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4174 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4175 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4176 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4177 #endif
4178 #ifdef CONFIG_IPV6_MROUTE
4179 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4180 #endif
4181 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4182 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4183 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4184 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4185 }
4186
4187 static inline size_t inet6_ifla6_size(void)
4188 {
4189 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4190 + nla_total_size(sizeof(struct ifla_cacheinfo))
4191 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4192 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4193 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4194 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4195 }
4196
4197 static inline size_t inet6_if_nlmsg_size(void)
4198 {
4199 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4200 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4201 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4202 + nla_total_size(4) /* IFLA_MTU */
4203 + nla_total_size(4) /* IFLA_LINK */
4204 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4205 }
4206
4207 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4208 int items, int bytes)
4209 {
4210 int i;
4211 int pad = bytes - sizeof(u64) * items;
4212 BUG_ON(pad < 0);
4213
4214 /* Use put_unaligned() because stats may not be aligned for u64. */
4215 put_unaligned(items, &stats[0]);
4216 for (i = 1; i < items; i++)
4217 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4218
4219 memset(&stats[items], 0, pad);
4220 }
4221
4222 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4223 int items, int bytes, size_t syncpoff)
4224 {
4225 int i;
4226 int pad = bytes - sizeof(u64) * items;
4227 BUG_ON(pad < 0);
4228
4229 /* Use put_unaligned() because stats may not be aligned for u64. */
4230 put_unaligned(items, &stats[0]);
4231 for (i = 1; i < items; i++)
4232 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4233
4234 memset(&stats[items], 0, pad);
4235 }
4236
4237 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4238 int bytes)
4239 {
4240 switch (attrtype) {
4241 case IFLA_INET6_STATS:
4242 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4243 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4244 break;
4245 case IFLA_INET6_ICMP6STATS:
4246 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4247 break;
4248 }
4249 }
4250
4251 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4252 {
4253 struct nlattr *nla;
4254 struct ifla_cacheinfo ci;
4255
4256 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4257 goto nla_put_failure;
4258 ci.max_reasm_len = IPV6_MAXPLEN;
4259 ci.tstamp = cstamp_delta(idev->tstamp);
4260 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4261 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4262 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4263 goto nla_put_failure;
4264 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4265 if (nla == NULL)
4266 goto nla_put_failure;
4267 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4268
4269 /* XXX - MC not implemented */
4270
4271 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4272 if (nla == NULL)
4273 goto nla_put_failure;
4274 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4275
4276 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4277 if (nla == NULL)
4278 goto nla_put_failure;
4279 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4280
4281 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4282 if (nla == NULL)
4283 goto nla_put_failure;
4284 read_lock_bh(&idev->lock);
4285 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4286 read_unlock_bh(&idev->lock);
4287
4288 return 0;
4289
4290 nla_put_failure:
4291 return -EMSGSIZE;
4292 }
4293
4294 static size_t inet6_get_link_af_size(const struct net_device *dev)
4295 {
4296 if (!__in6_dev_get(dev))
4297 return 0;
4298
4299 return inet6_ifla6_size();
4300 }
4301
4302 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4303 {
4304 struct inet6_dev *idev = __in6_dev_get(dev);
4305
4306 if (!idev)
4307 return -ENODATA;
4308
4309 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4310 return -EMSGSIZE;
4311
4312 return 0;
4313 }
4314
4315 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4316 {
4317 struct inet6_ifaddr *ifp;
4318 struct net_device *dev = idev->dev;
4319 bool update_rs = false;
4320
4321 if (token == NULL)
4322 return -EINVAL;
4323 if (ipv6_addr_any(token))
4324 return -EINVAL;
4325 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4326 return -EINVAL;
4327 if (!ipv6_accept_ra(idev))
4328 return -EINVAL;
4329 if (idev->cnf.rtr_solicits <= 0)
4330 return -EINVAL;
4331
4332 write_lock_bh(&idev->lock);
4333
4334 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4335 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4336
4337 write_unlock_bh(&idev->lock);
4338
4339 if (!idev->dead && (idev->if_flags & IF_READY)) {
4340 struct in6_addr ll_addr;
4341
4342 ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4343 IFA_F_OPTIMISTIC);
4344
4345 /* If we're not ready, then normal ifup will take care
4346 * of this. Otherwise, we need to request our rs here.
4347 */
4348 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4349 update_rs = true;
4350 }
4351
4352 write_lock_bh(&idev->lock);
4353
4354 if (update_rs)
4355 idev->if_flags |= IF_RS_SENT;
4356
4357 /* Well, that's kinda nasty ... */
4358 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4359 spin_lock(&ifp->lock);
4360 if (ifp->tokenized) {
4361 ifp->valid_lft = 0;
4362 ifp->prefered_lft = 0;
4363 }
4364 spin_unlock(&ifp->lock);
4365 }
4366
4367 write_unlock_bh(&idev->lock);
4368 return 0;
4369 }
4370
4371 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4372 {
4373 int err = -EINVAL;
4374 struct inet6_dev *idev = __in6_dev_get(dev);
4375 struct nlattr *tb[IFLA_INET6_MAX + 1];
4376
4377 if (!idev)
4378 return -EAFNOSUPPORT;
4379
4380 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4381 BUG();
4382
4383 if (tb[IFLA_INET6_TOKEN])
4384 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4385
4386 return err;
4387 }
4388
4389 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4390 u32 portid, u32 seq, int event, unsigned int flags)
4391 {
4392 struct net_device *dev = idev->dev;
4393 struct ifinfomsg *hdr;
4394 struct nlmsghdr *nlh;
4395 void *protoinfo;
4396
4397 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4398 if (nlh == NULL)
4399 return -EMSGSIZE;
4400
4401 hdr = nlmsg_data(nlh);
4402 hdr->ifi_family = AF_INET6;
4403 hdr->__ifi_pad = 0;
4404 hdr->ifi_type = dev->type;
4405 hdr->ifi_index = dev->ifindex;
4406 hdr->ifi_flags = dev_get_flags(dev);
4407 hdr->ifi_change = 0;
4408
4409 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4410 (dev->addr_len &&
4411 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4412 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4413 (dev->ifindex != dev->iflink &&
4414 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4415 goto nla_put_failure;
4416 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4417 if (protoinfo == NULL)
4418 goto nla_put_failure;
4419
4420 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4421 goto nla_put_failure;
4422
4423 nla_nest_end(skb, protoinfo);
4424 return nlmsg_end(skb, nlh);
4425
4426 nla_put_failure:
4427 nlmsg_cancel(skb, nlh);
4428 return -EMSGSIZE;
4429 }
4430
4431 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4432 {
4433 struct net *net = sock_net(skb->sk);
4434 int h, s_h;
4435 int idx = 0, s_idx;
4436 struct net_device *dev;
4437 struct inet6_dev *idev;
4438 struct hlist_head *head;
4439
4440 s_h = cb->args[0];
4441 s_idx = cb->args[1];
4442
4443 rcu_read_lock();
4444 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4445 idx = 0;
4446 head = &net->dev_index_head[h];
4447 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4448 if (idx < s_idx)
4449 goto cont;
4450 idev = __in6_dev_get(dev);
4451 if (!idev)
4452 goto cont;
4453 if (inet6_fill_ifinfo(skb, idev,
4454 NETLINK_CB(cb->skb).portid,
4455 cb->nlh->nlmsg_seq,
4456 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4457 goto out;
4458 cont:
4459 idx++;
4460 }
4461 }
4462 out:
4463 rcu_read_unlock();
4464 cb->args[1] = idx;
4465 cb->args[0] = h;
4466
4467 return skb->len;
4468 }
4469
4470 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4471 {
4472 struct sk_buff *skb;
4473 struct net *net = dev_net(idev->dev);
4474 int err = -ENOBUFS;
4475
4476 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4477 if (skb == NULL)
4478 goto errout;
4479
4480 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4481 if (err < 0) {
4482 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4483 WARN_ON(err == -EMSGSIZE);
4484 kfree_skb(skb);
4485 goto errout;
4486 }
4487 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4488 return;
4489 errout:
4490 if (err < 0)
4491 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4492 }
4493
4494 static inline size_t inet6_prefix_nlmsg_size(void)
4495 {
4496 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4497 + nla_total_size(sizeof(struct in6_addr))
4498 + nla_total_size(sizeof(struct prefix_cacheinfo));
4499 }
4500
4501 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4502 struct prefix_info *pinfo, u32 portid, u32 seq,
4503 int event, unsigned int flags)
4504 {
4505 struct prefixmsg *pmsg;
4506 struct nlmsghdr *nlh;
4507 struct prefix_cacheinfo ci;
4508
4509 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4510 if (nlh == NULL)
4511 return -EMSGSIZE;
4512
4513 pmsg = nlmsg_data(nlh);
4514 pmsg->prefix_family = AF_INET6;
4515 pmsg->prefix_pad1 = 0;
4516 pmsg->prefix_pad2 = 0;
4517 pmsg->prefix_ifindex = idev->dev->ifindex;
4518 pmsg->prefix_len = pinfo->prefix_len;
4519 pmsg->prefix_type = pinfo->type;
4520 pmsg->prefix_pad3 = 0;
4521 pmsg->prefix_flags = 0;
4522 if (pinfo->onlink)
4523 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4524 if (pinfo->autoconf)
4525 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4526
4527 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4528 goto nla_put_failure;
4529 ci.preferred_time = ntohl(pinfo->prefered);
4530 ci.valid_time = ntohl(pinfo->valid);
4531 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4532 goto nla_put_failure;
4533 return nlmsg_end(skb, nlh);
4534
4535 nla_put_failure:
4536 nlmsg_cancel(skb, nlh);
4537 return -EMSGSIZE;
4538 }
4539
4540 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4541 struct prefix_info *pinfo)
4542 {
4543 struct sk_buff *skb;
4544 struct net *net = dev_net(idev->dev);
4545 int err = -ENOBUFS;
4546
4547 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4548 if (skb == NULL)
4549 goto errout;
4550
4551 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4552 if (err < 0) {
4553 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4554 WARN_ON(err == -EMSGSIZE);
4555 kfree_skb(skb);
4556 goto errout;
4557 }
4558 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4559 return;
4560 errout:
4561 if (err < 0)
4562 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4563 }
4564
4565 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4566 {
4567 struct net *net = dev_net(ifp->idev->dev);
4568
4569 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4570
4571 switch (event) {
4572 case RTM_NEWADDR:
4573 /*
4574 * If the address was optimistic
4575 * we inserted the route at the start of
4576 * our DAD process, so we don't need
4577 * to do it again
4578 */
4579 if (!(ifp->rt->rt6i_node))
4580 ip6_ins_rt(ifp->rt);
4581 if (ifp->idev->cnf.forwarding)
4582 addrconf_join_anycast(ifp);
4583 if (!ipv6_addr_any(&ifp->peer_addr))
4584 addrconf_prefix_route(&ifp->peer_addr, 128,
4585 ifp->idev->dev, 0, 0);
4586 break;
4587 case RTM_DELADDR:
4588 if (ifp->idev->cnf.forwarding)
4589 addrconf_leave_anycast(ifp);
4590 addrconf_leave_solict(ifp->idev, &ifp->addr);
4591 if (!ipv6_addr_any(&ifp->peer_addr)) {
4592 struct rt6_info *rt;
4593 struct net_device *dev = ifp->idev->dev;
4594
4595 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4596 dev->ifindex, 1);
4597 if (rt) {
4598 dst_hold(&rt->dst);
4599 if (ip6_del_rt(rt))
4600 dst_free(&rt->dst);
4601 }
4602 }
4603 dst_hold(&ifp->rt->dst);
4604
4605 if (ip6_del_rt(ifp->rt))
4606 dst_free(&ifp->rt->dst);
4607 break;
4608 }
4609 atomic_inc(&net->ipv6.dev_addr_genid);
4610 }
4611
4612 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4613 {
4614 rcu_read_lock_bh();
4615 if (likely(ifp->idev->dead == 0))
4616 __ipv6_ifa_notify(event, ifp);
4617 rcu_read_unlock_bh();
4618 }
4619
4620 #ifdef CONFIG_SYSCTL
4621
4622 static
4623 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4624 void __user *buffer, size_t *lenp, loff_t *ppos)
4625 {
4626 int *valp = ctl->data;
4627 int val = *valp;
4628 loff_t pos = *ppos;
4629 struct ctl_table lctl;
4630 int ret;
4631
4632 /*
4633 * ctl->data points to idev->cnf.forwarding, we should
4634 * not modify it until we get the rtnl lock.
4635 */
4636 lctl = *ctl;
4637 lctl.data = &val;
4638
4639 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4640
4641 if (write)
4642 ret = addrconf_fixup_forwarding(ctl, valp, val);
4643 if (ret)
4644 *ppos = pos;
4645 return ret;
4646 }
4647
4648 static void dev_disable_change(struct inet6_dev *idev)
4649 {
4650 struct netdev_notifier_info info;
4651
4652 if (!idev || !idev->dev)
4653 return;
4654
4655 netdev_notifier_info_init(&info, idev->dev);
4656 if (idev->cnf.disable_ipv6)
4657 addrconf_notify(NULL, NETDEV_DOWN, &info);
4658 else
4659 addrconf_notify(NULL, NETDEV_UP, &info);
4660 }
4661
4662 static void addrconf_disable_change(struct net *net, __s32 newf)
4663 {
4664 struct net_device *dev;
4665 struct inet6_dev *idev;
4666
4667 rcu_read_lock();
4668 for_each_netdev_rcu(net, dev) {
4669 idev = __in6_dev_get(dev);
4670 if (idev) {
4671 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4672 idev->cnf.disable_ipv6 = newf;
4673 if (changed)
4674 dev_disable_change(idev);
4675 }
4676 }
4677 rcu_read_unlock();
4678 }
4679
4680 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4681 {
4682 struct net *net;
4683 int old;
4684
4685 if (!rtnl_trylock())
4686 return restart_syscall();
4687
4688 net = (struct net *)table->extra2;
4689 old = *p;
4690 *p = newf;
4691
4692 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4693 rtnl_unlock();
4694 return 0;
4695 }
4696
4697 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4698 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4699 addrconf_disable_change(net, newf);
4700 } else if ((!newf) ^ (!old))
4701 dev_disable_change((struct inet6_dev *)table->extra1);
4702
4703 rtnl_unlock();
4704 return 0;
4705 }
4706
4707 static
4708 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4709 void __user *buffer, size_t *lenp, loff_t *ppos)
4710 {
4711 int *valp = ctl->data;
4712 int val = *valp;
4713 loff_t pos = *ppos;
4714 struct ctl_table lctl;
4715 int ret;
4716
4717 /*
4718 * ctl->data points to idev->cnf.disable_ipv6, we should
4719 * not modify it until we get the rtnl lock.
4720 */
4721 lctl = *ctl;
4722 lctl.data = &val;
4723
4724 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4725
4726 if (write)
4727 ret = addrconf_disable_ipv6(ctl, valp, val);
4728 if (ret)
4729 *ppos = pos;
4730 return ret;
4731 }
4732
4733 static struct addrconf_sysctl_table
4734 {
4735 struct ctl_table_header *sysctl_header;
4736 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4737 } addrconf_sysctl __read_mostly = {
4738 .sysctl_header = NULL,
4739 .addrconf_vars = {
4740 {
4741 .procname = "forwarding",
4742 .data = &ipv6_devconf.forwarding,
4743 .maxlen = sizeof(int),
4744 .mode = 0644,
4745 .proc_handler = addrconf_sysctl_forward,
4746 },
4747 {
4748 .procname = "hop_limit",
4749 .data = &ipv6_devconf.hop_limit,
4750 .maxlen = sizeof(int),
4751 .mode = 0644,
4752 .proc_handler = proc_dointvec,
4753 },
4754 {
4755 .procname = "mtu",
4756 .data = &ipv6_devconf.mtu6,
4757 .maxlen = sizeof(int),
4758 .mode = 0644,
4759 .proc_handler = proc_dointvec,
4760 },
4761 {
4762 .procname = "accept_ra",
4763 .data = &ipv6_devconf.accept_ra,
4764 .maxlen = sizeof(int),
4765 .mode = 0644,
4766 .proc_handler = proc_dointvec,
4767 },
4768 {
4769 .procname = "accept_redirects",
4770 .data = &ipv6_devconf.accept_redirects,
4771 .maxlen = sizeof(int),
4772 .mode = 0644,
4773 .proc_handler = proc_dointvec,
4774 },
4775 {
4776 .procname = "autoconf",
4777 .data = &ipv6_devconf.autoconf,
4778 .maxlen = sizeof(int),
4779 .mode = 0644,
4780 .proc_handler = proc_dointvec,
4781 },
4782 {
4783 .procname = "dad_transmits",
4784 .data = &ipv6_devconf.dad_transmits,
4785 .maxlen = sizeof(int),
4786 .mode = 0644,
4787 .proc_handler = proc_dointvec,
4788 },
4789 {
4790 .procname = "router_solicitations",
4791 .data = &ipv6_devconf.rtr_solicits,
4792 .maxlen = sizeof(int),
4793 .mode = 0644,
4794 .proc_handler = proc_dointvec,
4795 },
4796 {
4797 .procname = "router_solicitation_interval",
4798 .data = &ipv6_devconf.rtr_solicit_interval,
4799 .maxlen = sizeof(int),
4800 .mode = 0644,
4801 .proc_handler = proc_dointvec_jiffies,
4802 },
4803 {
4804 .procname = "router_solicitation_delay",
4805 .data = &ipv6_devconf.rtr_solicit_delay,
4806 .maxlen = sizeof(int),
4807 .mode = 0644,
4808 .proc_handler = proc_dointvec_jiffies,
4809 },
4810 {
4811 .procname = "force_mld_version",
4812 .data = &ipv6_devconf.force_mld_version,
4813 .maxlen = sizeof(int),
4814 .mode = 0644,
4815 .proc_handler = proc_dointvec,
4816 },
4817 #ifdef CONFIG_IPV6_PRIVACY
4818 {
4819 .procname = "use_tempaddr",
4820 .data = &ipv6_devconf.use_tempaddr,
4821 .maxlen = sizeof(int),
4822 .mode = 0644,
4823 .proc_handler = proc_dointvec,
4824 },
4825 {
4826 .procname = "temp_valid_lft",
4827 .data = &ipv6_devconf.temp_valid_lft,
4828 .maxlen = sizeof(int),
4829 .mode = 0644,
4830 .proc_handler = proc_dointvec,
4831 },
4832 {
4833 .procname = "temp_prefered_lft",
4834 .data = &ipv6_devconf.temp_prefered_lft,
4835 .maxlen = sizeof(int),
4836 .mode = 0644,
4837 .proc_handler = proc_dointvec,
4838 },
4839 {
4840 .procname = "regen_max_retry",
4841 .data = &ipv6_devconf.regen_max_retry,
4842 .maxlen = sizeof(int),
4843 .mode = 0644,
4844 .proc_handler = proc_dointvec,
4845 },
4846 {
4847 .procname = "max_desync_factor",
4848 .data = &ipv6_devconf.max_desync_factor,
4849 .maxlen = sizeof(int),
4850 .mode = 0644,
4851 .proc_handler = proc_dointvec,
4852 },
4853 #endif
4854 {
4855 .procname = "max_addresses",
4856 .data = &ipv6_devconf.max_addresses,
4857 .maxlen = sizeof(int),
4858 .mode = 0644,
4859 .proc_handler = proc_dointvec,
4860 },
4861 {
4862 .procname = "accept_ra_defrtr",
4863 .data = &ipv6_devconf.accept_ra_defrtr,
4864 .maxlen = sizeof(int),
4865 .mode = 0644,
4866 .proc_handler = proc_dointvec,
4867 },
4868 {
4869 .procname = "accept_ra_pinfo",
4870 .data = &ipv6_devconf.accept_ra_pinfo,
4871 .maxlen = sizeof(int),
4872 .mode = 0644,
4873 .proc_handler = proc_dointvec,
4874 },
4875 #ifdef CONFIG_IPV6_ROUTER_PREF
4876 {
4877 .procname = "accept_ra_rtr_pref",
4878 .data = &ipv6_devconf.accept_ra_rtr_pref,
4879 .maxlen = sizeof(int),
4880 .mode = 0644,
4881 .proc_handler = proc_dointvec,
4882 },
4883 {
4884 .procname = "router_probe_interval",
4885 .data = &ipv6_devconf.rtr_probe_interval,
4886 .maxlen = sizeof(int),
4887 .mode = 0644,
4888 .proc_handler = proc_dointvec_jiffies,
4889 },
4890 #ifdef CONFIG_IPV6_ROUTE_INFO
4891 {
4892 .procname = "accept_ra_rt_info_max_plen",
4893 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4894 .maxlen = sizeof(int),
4895 .mode = 0644,
4896 .proc_handler = proc_dointvec,
4897 },
4898 #endif
4899 #endif
4900 {
4901 .procname = "proxy_ndp",
4902 .data = &ipv6_devconf.proxy_ndp,
4903 .maxlen = sizeof(int),
4904 .mode = 0644,
4905 .proc_handler = proc_dointvec,
4906 },
4907 {
4908 .procname = "accept_source_route",
4909 .data = &ipv6_devconf.accept_source_route,
4910 .maxlen = sizeof(int),
4911 .mode = 0644,
4912 .proc_handler = proc_dointvec,
4913 },
4914 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4915 {
4916 .procname = "optimistic_dad",
4917 .data = &ipv6_devconf.optimistic_dad,
4918 .maxlen = sizeof(int),
4919 .mode = 0644,
4920 .proc_handler = proc_dointvec,
4921
4922 },
4923 #endif
4924 #ifdef CONFIG_IPV6_MROUTE
4925 {
4926 .procname = "mc_forwarding",
4927 .data = &ipv6_devconf.mc_forwarding,
4928 .maxlen = sizeof(int),
4929 .mode = 0444,
4930 .proc_handler = proc_dointvec,
4931 },
4932 #endif
4933 {
4934 .procname = "disable_ipv6",
4935 .data = &ipv6_devconf.disable_ipv6,
4936 .maxlen = sizeof(int),
4937 .mode = 0644,
4938 .proc_handler = addrconf_sysctl_disable,
4939 },
4940 {
4941 .procname = "accept_dad",
4942 .data = &ipv6_devconf.accept_dad,
4943 .maxlen = sizeof(int),
4944 .mode = 0644,
4945 .proc_handler = proc_dointvec,
4946 },
4947 {
4948 .procname = "force_tllao",
4949 .data = &ipv6_devconf.force_tllao,
4950 .maxlen = sizeof(int),
4951 .mode = 0644,
4952 .proc_handler = proc_dointvec
4953 },
4954 {
4955 .procname = "ndisc_notify",
4956 .data = &ipv6_devconf.ndisc_notify,
4957 .maxlen = sizeof(int),
4958 .mode = 0644,
4959 .proc_handler = proc_dointvec
4960 },
4961 {
4962 /* sentinel */
4963 }
4964 },
4965 };
4966
4967 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4968 struct inet6_dev *idev, struct ipv6_devconf *p)
4969 {
4970 int i;
4971 struct addrconf_sysctl_table *t;
4972 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4973
4974 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4975 if (t == NULL)
4976 goto out;
4977
4978 for (i = 0; t->addrconf_vars[i].data; i++) {
4979 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4980 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4981 t->addrconf_vars[i].extra2 = net;
4982 }
4983
4984 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4985
4986 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4987 if (t->sysctl_header == NULL)
4988 goto free;
4989
4990 p->sysctl = t;
4991 return 0;
4992
4993 free:
4994 kfree(t);
4995 out:
4996 return -ENOBUFS;
4997 }
4998
4999 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5000 {
5001 struct addrconf_sysctl_table *t;
5002
5003 if (p->sysctl == NULL)
5004 return;
5005
5006 t = p->sysctl;
5007 p->sysctl = NULL;
5008 unregister_net_sysctl_table(t->sysctl_header);
5009 kfree(t);
5010 }
5011
5012 static void addrconf_sysctl_register(struct inet6_dev *idev)
5013 {
5014 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
5015 &ndisc_ifinfo_sysctl_change);
5016 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5017 idev, &idev->cnf);
5018 }
5019
5020 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5021 {
5022 __addrconf_sysctl_unregister(&idev->cnf);
5023 neigh_sysctl_unregister(idev->nd_parms);
5024 }
5025
5026
5027 #endif
5028
5029 static int __net_init addrconf_init_net(struct net *net)
5030 {
5031 int err = -ENOMEM;
5032 struct ipv6_devconf *all, *dflt;
5033
5034 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5035 if (all == NULL)
5036 goto err_alloc_all;
5037
5038 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5039 if (dflt == NULL)
5040 goto err_alloc_dflt;
5041
5042 /* these will be inherited by all namespaces */
5043 dflt->autoconf = ipv6_defaults.autoconf;
5044 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5045
5046 net->ipv6.devconf_all = all;
5047 net->ipv6.devconf_dflt = dflt;
5048
5049 #ifdef CONFIG_SYSCTL
5050 err = __addrconf_sysctl_register(net, "all", NULL, all);
5051 if (err < 0)
5052 goto err_reg_all;
5053
5054 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5055 if (err < 0)
5056 goto err_reg_dflt;
5057 #endif
5058 return 0;
5059
5060 #ifdef CONFIG_SYSCTL
5061 err_reg_dflt:
5062 __addrconf_sysctl_unregister(all);
5063 err_reg_all:
5064 kfree(dflt);
5065 #endif
5066 err_alloc_dflt:
5067 kfree(all);
5068 err_alloc_all:
5069 return err;
5070 }
5071
5072 static void __net_exit addrconf_exit_net(struct net *net)
5073 {
5074 #ifdef CONFIG_SYSCTL
5075 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5076 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5077 #endif
5078 if (!net_eq(net, &init_net)) {
5079 kfree(net->ipv6.devconf_dflt);
5080 kfree(net->ipv6.devconf_all);
5081 }
5082 }
5083
5084 static struct pernet_operations addrconf_ops = {
5085 .init = addrconf_init_net,
5086 .exit = addrconf_exit_net,
5087 };
5088
5089 static struct rtnl_af_ops inet6_ops = {
5090 .family = AF_INET6,
5091 .fill_link_af = inet6_fill_link_af,
5092 .get_link_af_size = inet6_get_link_af_size,
5093 .set_link_af = inet6_set_link_af,
5094 };
5095
5096 /*
5097 * Init / cleanup code
5098 */
5099
5100 int __init addrconf_init(void)
5101 {
5102 int i, err;
5103
5104 err = ipv6_addr_label_init();
5105 if (err < 0) {
5106 pr_crit("%s: cannot initialize default policy table: %d\n",
5107 __func__, err);
5108 goto out;
5109 }
5110
5111 err = register_pernet_subsys(&addrconf_ops);
5112 if (err < 0)
5113 goto out_addrlabel;
5114
5115 /* The addrconf netdev notifier requires that loopback_dev
5116 * has it's ipv6 private information allocated and setup
5117 * before it can bring up and give link-local addresses
5118 * to other devices which are up.
5119 *
5120 * Unfortunately, loopback_dev is not necessarily the first
5121 * entry in the global dev_base list of net devices. In fact,
5122 * it is likely to be the very last entry on that list.
5123 * So this causes the notifier registry below to try and
5124 * give link-local addresses to all devices besides loopback_dev
5125 * first, then loopback_dev, which cases all the non-loopback_dev
5126 * devices to fail to get a link-local address.
5127 *
5128 * So, as a temporary fix, allocate the ipv6 structure for
5129 * loopback_dev first by hand.
5130 * Longer term, all of the dependencies ipv6 has upon the loopback
5131 * device and it being up should be removed.
5132 */
5133 rtnl_lock();
5134 if (!ipv6_add_dev(init_net.loopback_dev))
5135 err = -ENOMEM;
5136 rtnl_unlock();
5137 if (err)
5138 goto errlo;
5139
5140 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5141 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5142
5143 register_netdevice_notifier(&ipv6_dev_notf);
5144
5145 addrconf_verify(0);
5146
5147 err = rtnl_af_register(&inet6_ops);
5148 if (err < 0)
5149 goto errout_af;
5150
5151 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5152 NULL);
5153 if (err < 0)
5154 goto errout;
5155
5156 /* Only the first call to __rtnl_register can fail */
5157 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5158 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5159 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5160 inet6_dump_ifaddr, NULL);
5161 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5162 inet6_dump_ifmcaddr, NULL);
5163 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5164 inet6_dump_ifacaddr, NULL);
5165 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5166 inet6_netconf_dump_devconf, NULL);
5167
5168 ipv6_addr_label_rtnl_register();
5169
5170 return 0;
5171 errout:
5172 rtnl_af_unregister(&inet6_ops);
5173 errout_af:
5174 unregister_netdevice_notifier(&ipv6_dev_notf);
5175 errlo:
5176 unregister_pernet_subsys(&addrconf_ops);
5177 out_addrlabel:
5178 ipv6_addr_label_cleanup();
5179 out:
5180 return err;
5181 }
5182
5183 void addrconf_cleanup(void)
5184 {
5185 struct net_device *dev;
5186 int i;
5187
5188 unregister_netdevice_notifier(&ipv6_dev_notf);
5189 unregister_pernet_subsys(&addrconf_ops);
5190 ipv6_addr_label_cleanup();
5191
5192 rtnl_lock();
5193
5194 __rtnl_af_unregister(&inet6_ops);
5195
5196 /* clean dev list */
5197 for_each_netdev(&init_net, dev) {
5198 if (__in6_dev_get(dev) == NULL)
5199 continue;
5200 addrconf_ifdown(dev, 1);
5201 }
5202 addrconf_ifdown(init_net.loopback_dev, 2);
5203
5204 /*
5205 * Check hash table.
5206 */
5207 spin_lock_bh(&addrconf_hash_lock);
5208 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5209 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5210 spin_unlock_bh(&addrconf_hash_lock);
5211
5212 del_timer(&addr_chk_timer);
5213 rtnl_unlock();
5214 }
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