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Linux 3.10.58
[GitHub/mt8127/android_kernel_alcatel_ttab.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 * Use age calculation as in addrconf_verify to avoid unnecessary
1115 * temporary addresses being generated.
1116 */
1117 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1118 if (tmp_prefered_lft <= regen_advance + age) {
1119 in6_ifa_put(ifp);
1120 in6_dev_put(idev);
1121 ret = -1;
1122 goto out;
1123 }
1124
1125 addr_flags = IFA_F_TEMPORARY;
1126 /* set in addrconf_prefix_rcv() */
1127 if (ifp->flags & IFA_F_OPTIMISTIC)
1128 addr_flags |= IFA_F_OPTIMISTIC;
1129
1130 ift = ipv6_add_addr(idev, &addr, tmp_plen,
1131 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
1132 addr_flags);
1133 if (IS_ERR(ift)) {
1134 in6_ifa_put(ifp);
1135 in6_dev_put(idev);
1136 pr_info("%s: retry temporary address regeneration\n", __func__);
1137 tmpaddr = &addr;
1138 write_lock(&idev->lock);
1139 goto retry;
1140 }
1141
1142 spin_lock_bh(&ift->lock);
1143 ift->ifpub = ifp;
1144 ift->valid_lft = tmp_valid_lft;
1145 ift->prefered_lft = tmp_prefered_lft;
1146 ift->cstamp = now;
1147 ift->tstamp = tmp_tstamp;
1148 spin_unlock_bh(&ift->lock);
1149
1150 addrconf_dad_start(ift);
1151 in6_ifa_put(ift);
1152 in6_dev_put(idev);
1153 out:
1154 return ret;
1155 }
1156 #endif
1157
1158 /*
1159 * Choose an appropriate source address (RFC3484)
1160 */
1161 enum {
1162 IPV6_SADDR_RULE_INIT = 0,
1163 IPV6_SADDR_RULE_LOCAL,
1164 IPV6_SADDR_RULE_SCOPE,
1165 IPV6_SADDR_RULE_PREFERRED,
1166 #ifdef CONFIG_IPV6_MIP6
1167 IPV6_SADDR_RULE_HOA,
1168 #endif
1169 IPV6_SADDR_RULE_OIF,
1170 IPV6_SADDR_RULE_LABEL,
1171 #ifdef CONFIG_IPV6_PRIVACY
1172 IPV6_SADDR_RULE_PRIVACY,
1173 #endif
1174 IPV6_SADDR_RULE_ORCHID,
1175 IPV6_SADDR_RULE_PREFIX,
1176 IPV6_SADDR_RULE_MAX
1177 };
1178
1179 struct ipv6_saddr_score {
1180 int rule;
1181 int addr_type;
1182 struct inet6_ifaddr *ifa;
1183 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1184 int scopedist;
1185 int matchlen;
1186 };
1187
1188 struct ipv6_saddr_dst {
1189 const struct in6_addr *addr;
1190 int ifindex;
1191 int scope;
1192 int label;
1193 unsigned int prefs;
1194 };
1195
1196 static inline int ipv6_saddr_preferred(int type)
1197 {
1198 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1199 return 1;
1200 return 0;
1201 }
1202
1203 static int ipv6_get_saddr_eval(struct net *net,
1204 struct ipv6_saddr_score *score,
1205 struct ipv6_saddr_dst *dst,
1206 int i)
1207 {
1208 int ret;
1209
1210 if (i <= score->rule) {
1211 switch (i) {
1212 case IPV6_SADDR_RULE_SCOPE:
1213 ret = score->scopedist;
1214 break;
1215 case IPV6_SADDR_RULE_PREFIX:
1216 ret = score->matchlen;
1217 break;
1218 default:
1219 ret = !!test_bit(i, score->scorebits);
1220 }
1221 goto out;
1222 }
1223
1224 switch (i) {
1225 case IPV6_SADDR_RULE_INIT:
1226 /* Rule 0: remember if hiscore is not ready yet */
1227 ret = !!score->ifa;
1228 break;
1229 case IPV6_SADDR_RULE_LOCAL:
1230 /* Rule 1: Prefer same address */
1231 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1232 break;
1233 case IPV6_SADDR_RULE_SCOPE:
1234 /* Rule 2: Prefer appropriate scope
1235 *
1236 * ret
1237 * ^
1238 * -1 | d 15
1239 * ---+--+-+---> scope
1240 * |
1241 * | d is scope of the destination.
1242 * B-d | \
1243 * | \ <- smaller scope is better if
1244 * B-15 | \ if scope is enough for destinaion.
1245 * | ret = B - scope (-1 <= scope >= d <= 15).
1246 * d-C-1 | /
1247 * |/ <- greater is better
1248 * -C / if scope is not enough for destination.
1249 * /| ret = scope - C (-1 <= d < scope <= 15).
1250 *
1251 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1252 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1253 * Assume B = 0 and we get C > 29.
1254 */
1255 ret = __ipv6_addr_src_scope(score->addr_type);
1256 if (ret >= dst->scope)
1257 ret = -ret;
1258 else
1259 ret -= 128; /* 30 is enough */
1260 score->scopedist = ret;
1261 break;
1262 case IPV6_SADDR_RULE_PREFERRED:
1263 /* Rule 3: Avoid deprecated and optimistic addresses */
1264 ret = ipv6_saddr_preferred(score->addr_type) ||
1265 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1266 break;
1267 #ifdef CONFIG_IPV6_MIP6
1268 case IPV6_SADDR_RULE_HOA:
1269 {
1270 /* Rule 4: Prefer home address */
1271 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1272 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1273 break;
1274 }
1275 #endif
1276 case IPV6_SADDR_RULE_OIF:
1277 /* Rule 5: Prefer outgoing interface */
1278 ret = (!dst->ifindex ||
1279 dst->ifindex == score->ifa->idev->dev->ifindex);
1280 break;
1281 case IPV6_SADDR_RULE_LABEL:
1282 /* Rule 6: Prefer matching label */
1283 ret = ipv6_addr_label(net,
1284 &score->ifa->addr, score->addr_type,
1285 score->ifa->idev->dev->ifindex) == dst->label;
1286 break;
1287 #ifdef CONFIG_IPV6_PRIVACY
1288 case IPV6_SADDR_RULE_PRIVACY:
1289 {
1290 /* Rule 7: Prefer public address
1291 * Note: prefer temporary address if use_tempaddr >= 2
1292 */
1293 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1294 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1295 score->ifa->idev->cnf.use_tempaddr >= 2;
1296 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1297 break;
1298 }
1299 #endif
1300 case IPV6_SADDR_RULE_ORCHID:
1301 /* Rule 8-: Prefer ORCHID vs ORCHID or
1302 * non-ORCHID vs non-ORCHID
1303 */
1304 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1305 ipv6_addr_orchid(dst->addr));
1306 break;
1307 case IPV6_SADDR_RULE_PREFIX:
1308 /* Rule 8: Use longest matching prefix */
1309 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1310 if (ret > score->ifa->prefix_len)
1311 ret = score->ifa->prefix_len;
1312 score->matchlen = ret;
1313 break;
1314 default:
1315 ret = 0;
1316 }
1317
1318 if (ret)
1319 __set_bit(i, score->scorebits);
1320 score->rule = i;
1321 out:
1322 return ret;
1323 }
1324
1325 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1326 const struct in6_addr *daddr, unsigned int prefs,
1327 struct in6_addr *saddr)
1328 {
1329 struct ipv6_saddr_score scores[2],
1330 *score = &scores[0], *hiscore = &scores[1];
1331 struct ipv6_saddr_dst dst;
1332 struct net_device *dev;
1333 int dst_type;
1334
1335 dst_type = __ipv6_addr_type(daddr);
1336 dst.addr = daddr;
1337 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1338 dst.scope = __ipv6_addr_src_scope(dst_type);
1339 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1340 dst.prefs = prefs;
1341
1342 hiscore->rule = -1;
1343 hiscore->ifa = NULL;
1344
1345 rcu_read_lock();
1346
1347 for_each_netdev_rcu(net, dev) {
1348 struct inet6_dev *idev;
1349
1350 /* Candidate Source Address (section 4)
1351 * - multicast and link-local destination address,
1352 * the set of candidate source address MUST only
1353 * include addresses assigned to interfaces
1354 * belonging to the same link as the outgoing
1355 * interface.
1356 * (- For site-local destination addresses, the
1357 * set of candidate source addresses MUST only
1358 * include addresses assigned to interfaces
1359 * belonging to the same site as the outgoing
1360 * interface.)
1361 */
1362 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1363 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1364 dst.ifindex && dev->ifindex != dst.ifindex)
1365 continue;
1366
1367 idev = __in6_dev_get(dev);
1368 if (!idev)
1369 continue;
1370
1371 read_lock_bh(&idev->lock);
1372 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1373 int i;
1374
1375 /*
1376 * - Tentative Address (RFC2462 section 5.4)
1377 * - A tentative address is not considered
1378 * "assigned to an interface" in the traditional
1379 * sense, unless it is also flagged as optimistic.
1380 * - Candidate Source Address (section 4)
1381 * - In any case, anycast addresses, multicast
1382 * addresses, and the unspecified address MUST
1383 * NOT be included in a candidate set.
1384 */
1385 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1386 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1387 continue;
1388
1389 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1390
1391 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1392 score->addr_type & IPV6_ADDR_MULTICAST)) {
1393 LIMIT_NETDEBUG(KERN_DEBUG
1394 "ADDRCONF: unspecified / multicast address "
1395 "assigned as unicast address on %s",
1396 dev->name);
1397 continue;
1398 }
1399
1400 score->rule = -1;
1401 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1402
1403 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1404 int minihiscore, miniscore;
1405
1406 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1407 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1408
1409 if (minihiscore > miniscore) {
1410 if (i == IPV6_SADDR_RULE_SCOPE &&
1411 score->scopedist > 0) {
1412 /*
1413 * special case:
1414 * each remaining entry
1415 * has too small (not enough)
1416 * scope, because ifa entries
1417 * are sorted by their scope
1418 * values.
1419 */
1420 goto try_nextdev;
1421 }
1422 break;
1423 } else if (minihiscore < miniscore) {
1424 if (hiscore->ifa)
1425 in6_ifa_put(hiscore->ifa);
1426
1427 in6_ifa_hold(score->ifa);
1428
1429 swap(hiscore, score);
1430
1431 /* restore our iterator */
1432 score->ifa = hiscore->ifa;
1433
1434 break;
1435 }
1436 }
1437 }
1438 try_nextdev:
1439 read_unlock_bh(&idev->lock);
1440 }
1441 rcu_read_unlock();
1442
1443 if (!hiscore->ifa)
1444 return -EADDRNOTAVAIL;
1445
1446 *saddr = hiscore->ifa->addr;
1447 in6_ifa_put(hiscore->ifa);
1448 return 0;
1449 }
1450 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1451
1452 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1453 unsigned char banned_flags)
1454 {
1455 struct inet6_ifaddr *ifp;
1456 int err = -EADDRNOTAVAIL;
1457
1458 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1459 if (ifp->scope == IFA_LINK &&
1460 !(ifp->flags & banned_flags)) {
1461 *addr = ifp->addr;
1462 err = 0;
1463 break;
1464 }
1465 }
1466 return err;
1467 }
1468
1469 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1470 unsigned char banned_flags)
1471 {
1472 struct inet6_dev *idev;
1473 int err = -EADDRNOTAVAIL;
1474
1475 rcu_read_lock();
1476 idev = __in6_dev_get(dev);
1477 if (idev) {
1478 read_lock_bh(&idev->lock);
1479 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1480 read_unlock_bh(&idev->lock);
1481 }
1482 rcu_read_unlock();
1483 return err;
1484 }
1485
1486 static int ipv6_count_addresses(struct inet6_dev *idev)
1487 {
1488 int cnt = 0;
1489 struct inet6_ifaddr *ifp;
1490
1491 read_lock_bh(&idev->lock);
1492 list_for_each_entry(ifp, &idev->addr_list, if_list)
1493 cnt++;
1494 read_unlock_bh(&idev->lock);
1495 return cnt;
1496 }
1497
1498 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1499 const struct net_device *dev, int strict)
1500 {
1501 struct inet6_ifaddr *ifp;
1502 unsigned int hash = inet6_addr_hash(addr);
1503
1504 rcu_read_lock_bh();
1505 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1506 if (!net_eq(dev_net(ifp->idev->dev), net))
1507 continue;
1508 if (ipv6_addr_equal(&ifp->addr, addr) &&
1509 !(ifp->flags&IFA_F_TENTATIVE) &&
1510 (dev == NULL || ifp->idev->dev == dev ||
1511 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1512 rcu_read_unlock_bh();
1513 return 1;
1514 }
1515 }
1516
1517 rcu_read_unlock_bh();
1518 return 0;
1519 }
1520 EXPORT_SYMBOL(ipv6_chk_addr);
1521
1522 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1523 struct net_device *dev)
1524 {
1525 unsigned int hash = inet6_addr_hash(addr);
1526 struct inet6_ifaddr *ifp;
1527
1528 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1529 if (!net_eq(dev_net(ifp->idev->dev), net))
1530 continue;
1531 if (ipv6_addr_equal(&ifp->addr, addr)) {
1532 if (dev == NULL || ifp->idev->dev == dev)
1533 return true;
1534 }
1535 }
1536 return false;
1537 }
1538
1539 /* Compares an address/prefix_len with addresses on device @dev.
1540 * If one is found it returns true.
1541 */
1542 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1543 const unsigned int prefix_len, struct net_device *dev)
1544 {
1545 struct inet6_dev *idev;
1546 struct inet6_ifaddr *ifa;
1547 bool ret = false;
1548
1549 rcu_read_lock();
1550 idev = __in6_dev_get(dev);
1551 if (idev) {
1552 read_lock_bh(&idev->lock);
1553 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1554 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1555 if (ret)
1556 break;
1557 }
1558 read_unlock_bh(&idev->lock);
1559 }
1560 rcu_read_unlock();
1561
1562 return ret;
1563 }
1564 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1565
1566 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1567 {
1568 struct inet6_dev *idev;
1569 struct inet6_ifaddr *ifa;
1570 int onlink;
1571
1572 onlink = 0;
1573 rcu_read_lock();
1574 idev = __in6_dev_get(dev);
1575 if (idev) {
1576 read_lock_bh(&idev->lock);
1577 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1578 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1579 ifa->prefix_len);
1580 if (onlink)
1581 break;
1582 }
1583 read_unlock_bh(&idev->lock);
1584 }
1585 rcu_read_unlock();
1586 return onlink;
1587 }
1588 EXPORT_SYMBOL(ipv6_chk_prefix);
1589
1590 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1591 struct net_device *dev, int strict)
1592 {
1593 struct inet6_ifaddr *ifp, *result = NULL;
1594 unsigned int hash = inet6_addr_hash(addr);
1595
1596 rcu_read_lock_bh();
1597 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1598 if (!net_eq(dev_net(ifp->idev->dev), net))
1599 continue;
1600 if (ipv6_addr_equal(&ifp->addr, addr)) {
1601 if (dev == NULL || ifp->idev->dev == dev ||
1602 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1603 result = ifp;
1604 in6_ifa_hold(ifp);
1605 break;
1606 }
1607 }
1608 }
1609 rcu_read_unlock_bh();
1610
1611 return result;
1612 }
1613
1614 /* Gets referenced address, destroys ifaddr */
1615
1616 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1617 {
1618 if (ifp->flags&IFA_F_PERMANENT) {
1619 spin_lock_bh(&ifp->lock);
1620 addrconf_del_timer(ifp);
1621 ifp->flags |= IFA_F_TENTATIVE;
1622 if (dad_failed)
1623 ifp->flags |= IFA_F_DADFAILED;
1624 spin_unlock_bh(&ifp->lock);
1625 if (dad_failed)
1626 ipv6_ifa_notify(0, ifp);
1627 in6_ifa_put(ifp);
1628 #ifdef CONFIG_IPV6_PRIVACY
1629 } else if (ifp->flags&IFA_F_TEMPORARY) {
1630 struct inet6_ifaddr *ifpub;
1631 spin_lock_bh(&ifp->lock);
1632 ifpub = ifp->ifpub;
1633 if (ifpub) {
1634 in6_ifa_hold(ifpub);
1635 spin_unlock_bh(&ifp->lock);
1636 ipv6_create_tempaddr(ifpub, ifp);
1637 in6_ifa_put(ifpub);
1638 } else {
1639 spin_unlock_bh(&ifp->lock);
1640 }
1641 ipv6_del_addr(ifp);
1642 #endif
1643 } else
1644 ipv6_del_addr(ifp);
1645 }
1646
1647 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1648 {
1649 int err = -ENOENT;
1650
1651 spin_lock(&ifp->state_lock);
1652 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1653 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1654 err = 0;
1655 }
1656 spin_unlock(&ifp->state_lock);
1657
1658 return err;
1659 }
1660
1661 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1662 {
1663 struct inet6_dev *idev = ifp->idev;
1664
1665 if (addrconf_dad_end(ifp)) {
1666 in6_ifa_put(ifp);
1667 return;
1668 }
1669
1670 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1671 ifp->idev->dev->name, &ifp->addr);
1672
1673 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1674 struct in6_addr addr;
1675
1676 addr.s6_addr32[0] = htonl(0xfe800000);
1677 addr.s6_addr32[1] = 0;
1678
1679 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1680 ipv6_addr_equal(&ifp->addr, &addr)) {
1681 /* DAD failed for link-local based on MAC address */
1682 idev->cnf.disable_ipv6 = 1;
1683
1684 pr_info("%s: IPv6 being disabled!\n",
1685 ifp->idev->dev->name);
1686 }
1687 }
1688
1689 addrconf_dad_stop(ifp, 1);
1690 }
1691
1692 /* Join to solicited addr multicast group. */
1693
1694 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1695 {
1696 struct in6_addr maddr;
1697
1698 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1699 return;
1700
1701 addrconf_addr_solict_mult(addr, &maddr);
1702 ipv6_dev_mc_inc(dev, &maddr);
1703 }
1704
1705 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1706 {
1707 struct in6_addr maddr;
1708
1709 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1710 return;
1711
1712 addrconf_addr_solict_mult(addr, &maddr);
1713 __ipv6_dev_mc_dec(idev, &maddr);
1714 }
1715
1716 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1717 {
1718 struct in6_addr addr;
1719 if (ifp->prefix_len == 127) /* RFC 6164 */
1720 return;
1721 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1722 if (ipv6_addr_any(&addr))
1723 return;
1724 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1725 }
1726
1727 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1728 {
1729 struct in6_addr addr;
1730 if (ifp->prefix_len == 127) /* RFC 6164 */
1731 return;
1732 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1733 if (ipv6_addr_any(&addr))
1734 return;
1735 __ipv6_dev_ac_dec(ifp->idev, &addr);
1736 }
1737
1738 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1739 {
1740 if (dev->addr_len != ETH_ALEN)
1741 return -1;
1742 memcpy(eui, dev->dev_addr, 3);
1743 memcpy(eui + 5, dev->dev_addr + 3, 3);
1744
1745 /*
1746 * The zSeries OSA network cards can be shared among various
1747 * OS instances, but the OSA cards have only one MAC address.
1748 * This leads to duplicate address conflicts in conjunction
1749 * with IPv6 if more than one instance uses the same card.
1750 *
1751 * The driver for these cards can deliver a unique 16-bit
1752 * identifier for each instance sharing the same card. It is
1753 * placed instead of 0xFFFE in the interface identifier. The
1754 * "u" bit of the interface identifier is not inverted in this
1755 * case. Hence the resulting interface identifier has local
1756 * scope according to RFC2373.
1757 */
1758 if (dev->dev_id) {
1759 eui[3] = (dev->dev_id >> 8) & 0xFF;
1760 eui[4] = dev->dev_id & 0xFF;
1761 } else {
1762 eui[3] = 0xFF;
1763 eui[4] = 0xFE;
1764 eui[0] ^= 2;
1765 }
1766 return 0;
1767 }
1768
1769 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1770 {
1771 if (dev->addr_len != IEEE802154_ADDR_LEN)
1772 return -1;
1773 memcpy(eui, dev->dev_addr, 8);
1774 eui[0] ^= 2;
1775 return 0;
1776 }
1777
1778 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1779 {
1780 union fwnet_hwaddr *ha;
1781
1782 if (dev->addr_len != FWNET_ALEN)
1783 return -1;
1784
1785 ha = (union fwnet_hwaddr *)dev->dev_addr;
1786
1787 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1788 eui[0] ^= 2;
1789 return 0;
1790 }
1791
1792 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1793 {
1794 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1795 if (dev->addr_len != ARCNET_ALEN)
1796 return -1;
1797 memset(eui, 0, 7);
1798 eui[7] = *(u8 *)dev->dev_addr;
1799 return 0;
1800 }
1801
1802 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1803 {
1804 if (dev->addr_len != INFINIBAND_ALEN)
1805 return -1;
1806 memcpy(eui, dev->dev_addr + 12, 8);
1807 eui[0] |= 2;
1808 return 0;
1809 }
1810
1811 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1812 {
1813 if (addr == 0)
1814 return -1;
1815 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1816 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1817 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1818 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1819 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1820 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1821 eui[1] = 0;
1822 eui[2] = 0x5E;
1823 eui[3] = 0xFE;
1824 memcpy(eui + 4, &addr, 4);
1825 return 0;
1826 }
1827
1828 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1829 {
1830 if (dev->priv_flags & IFF_ISATAP)
1831 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1832 return -1;
1833 }
1834
1835 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1836 {
1837 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1838 }
1839
1840 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1841 {
1842 switch (dev->type) {
1843 case ARPHRD_ETHER:
1844 case ARPHRD_FDDI:
1845 return addrconf_ifid_eui48(eui, dev);
1846 case ARPHRD_ARCNET:
1847 return addrconf_ifid_arcnet(eui, dev);
1848 case ARPHRD_INFINIBAND:
1849 return addrconf_ifid_infiniband(eui, dev);
1850 case ARPHRD_SIT:
1851 return addrconf_ifid_sit(eui, dev);
1852 case ARPHRD_IPGRE:
1853 return addrconf_ifid_gre(eui, dev);
1854 case ARPHRD_IEEE802154:
1855 return addrconf_ifid_eui64(eui, dev);
1856 case ARPHRD_IEEE1394:
1857 return addrconf_ifid_ieee1394(eui, dev);
1858 }
1859 return -1;
1860 }
1861
1862 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1863 {
1864 int err = -1;
1865 struct inet6_ifaddr *ifp;
1866
1867 read_lock_bh(&idev->lock);
1868 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1869 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1870 memcpy(eui, ifp->addr.s6_addr+8, 8);
1871 err = 0;
1872 break;
1873 }
1874 }
1875 read_unlock_bh(&idev->lock);
1876 return err;
1877 }
1878
1879 #ifdef CONFIG_IPV6_PRIVACY
1880 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1881 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1882 {
1883 regen:
1884 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1885 idev->rndid[0] &= ~0x02;
1886
1887 /*
1888 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1889 * check if generated address is not inappropriate
1890 *
1891 * - Reserved subnet anycast (RFC 2526)
1892 * 11111101 11....11 1xxxxxxx
1893 * - ISATAP (RFC4214) 6.1
1894 * 00-00-5E-FE-xx-xx-xx-xx
1895 * - value 0
1896 * - XXX: already assigned to an address on the device
1897 */
1898 if (idev->rndid[0] == 0xfd &&
1899 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1900 (idev->rndid[7]&0x80))
1901 goto regen;
1902 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1903 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1904 goto regen;
1905 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1906 goto regen;
1907 }
1908 }
1909
1910 static void ipv6_regen_rndid(unsigned long data)
1911 {
1912 struct inet6_dev *idev = (struct inet6_dev *) data;
1913 unsigned long expires;
1914
1915 rcu_read_lock_bh();
1916 write_lock_bh(&idev->lock);
1917
1918 if (idev->dead)
1919 goto out;
1920
1921 __ipv6_regen_rndid(idev);
1922
1923 expires = jiffies +
1924 idev->cnf.temp_prefered_lft * HZ -
1925 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1926 idev->cnf.max_desync_factor * HZ;
1927 if (time_before(expires, jiffies)) {
1928 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1929 __func__, idev->dev->name);
1930 goto out;
1931 }
1932
1933 if (!mod_timer(&idev->regen_timer, expires))
1934 in6_dev_hold(idev);
1935
1936 out:
1937 write_unlock_bh(&idev->lock);
1938 rcu_read_unlock_bh();
1939 in6_dev_put(idev);
1940 }
1941
1942 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1943 {
1944 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1945 __ipv6_regen_rndid(idev);
1946 }
1947 #endif
1948
1949 /*
1950 * Add prefix route.
1951 */
1952
1953 static void
1954 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1955 unsigned long expires, u32 flags)
1956 {
1957 struct fib6_config cfg = {
1958 .fc_table = RT6_TABLE_PREFIX,
1959 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1960 .fc_ifindex = dev->ifindex,
1961 .fc_expires = expires,
1962 .fc_dst_len = plen,
1963 .fc_flags = RTF_UP | flags,
1964 .fc_nlinfo.nl_net = dev_net(dev),
1965 .fc_protocol = RTPROT_KERNEL,
1966 };
1967
1968 cfg.fc_dst = *pfx;
1969
1970 /* Prevent useless cloning on PtP SIT.
1971 This thing is done here expecting that the whole
1972 class of non-broadcast devices need not cloning.
1973 */
1974 #if IS_ENABLED(CONFIG_IPV6_SIT)
1975 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1976 cfg.fc_flags |= RTF_NONEXTHOP;
1977 #endif
1978
1979 ip6_route_add(&cfg);
1980 }
1981
1982
1983 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1984 int plen,
1985 const struct net_device *dev,
1986 u32 flags, u32 noflags)
1987 {
1988 struct fib6_node *fn;
1989 struct rt6_info *rt = NULL;
1990 struct fib6_table *table;
1991
1992 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1993 if (table == NULL)
1994 return NULL;
1995
1996 read_lock_bh(&table->tb6_lock);
1997 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1998 if (!fn)
1999 goto out;
2000 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2001 if (rt->dst.dev->ifindex != dev->ifindex)
2002 continue;
2003 if ((rt->rt6i_flags & flags) != flags)
2004 continue;
2005 if ((rt->rt6i_flags & noflags) != 0)
2006 continue;
2007 dst_hold(&rt->dst);
2008 break;
2009 }
2010 out:
2011 read_unlock_bh(&table->tb6_lock);
2012 return rt;
2013 }
2014
2015
2016 /* Create "default" multicast route to the interface */
2017
2018 static void addrconf_add_mroute(struct net_device *dev)
2019 {
2020 struct fib6_config cfg = {
2021 .fc_table = RT6_TABLE_LOCAL,
2022 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2023 .fc_ifindex = dev->ifindex,
2024 .fc_dst_len = 8,
2025 .fc_flags = RTF_UP,
2026 .fc_nlinfo.nl_net = dev_net(dev),
2027 };
2028
2029 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2030
2031 ip6_route_add(&cfg);
2032 }
2033
2034 #if IS_ENABLED(CONFIG_IPV6_SIT)
2035 static void sit_route_add(struct net_device *dev)
2036 {
2037 struct fib6_config cfg = {
2038 .fc_table = RT6_TABLE_MAIN,
2039 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2040 .fc_ifindex = dev->ifindex,
2041 .fc_dst_len = 96,
2042 .fc_flags = RTF_UP | RTF_NONEXTHOP,
2043 .fc_nlinfo.nl_net = dev_net(dev),
2044 };
2045
2046 /* prefix length - 96 bits "::d.d.d.d" */
2047 ip6_route_add(&cfg);
2048 }
2049 #endif
2050
2051 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2052 {
2053 struct inet6_dev *idev;
2054
2055 ASSERT_RTNL();
2056
2057 idev = ipv6_find_idev(dev);
2058 if (!idev)
2059 return ERR_PTR(-ENOBUFS);
2060
2061 if (idev->cnf.disable_ipv6)
2062 return ERR_PTR(-EACCES);
2063
2064 /* Add default multicast route */
2065 if (!(dev->flags & IFF_LOOPBACK))
2066 addrconf_add_mroute(dev);
2067
2068 return idev;
2069 }
2070
2071 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2072 {
2073 struct prefix_info *pinfo;
2074 __u32 valid_lft;
2075 __u32 prefered_lft;
2076 int addr_type;
2077 struct inet6_dev *in6_dev;
2078 struct net *net = dev_net(dev);
2079
2080 pinfo = (struct prefix_info *) opt;
2081
2082 if (len < sizeof(struct prefix_info)) {
2083 ADBG(("addrconf: prefix option too short\n"));
2084 return;
2085 }
2086
2087 /*
2088 * Validation checks ([ADDRCONF], page 19)
2089 */
2090
2091 addr_type = ipv6_addr_type(&pinfo->prefix);
2092
2093 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2094 return;
2095
2096 valid_lft = ntohl(pinfo->valid);
2097 prefered_lft = ntohl(pinfo->prefered);
2098
2099 if (prefered_lft > valid_lft) {
2100 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2101 return;
2102 }
2103
2104 in6_dev = in6_dev_get(dev);
2105
2106 if (in6_dev == NULL) {
2107 net_dbg_ratelimited("addrconf: device %s not configured\n",
2108 dev->name);
2109 return;
2110 }
2111
2112 /*
2113 * Two things going on here:
2114 * 1) Add routes for on-link prefixes
2115 * 2) Configure prefixes with the auto flag set
2116 */
2117
2118 if (pinfo->onlink) {
2119 struct rt6_info *rt;
2120 unsigned long rt_expires;
2121
2122 /* Avoid arithmetic overflow. Really, we could
2123 * save rt_expires in seconds, likely valid_lft,
2124 * but it would require division in fib gc, that it
2125 * not good.
2126 */
2127 if (HZ > USER_HZ)
2128 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2129 else
2130 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2131
2132 if (addrconf_finite_timeout(rt_expires))
2133 rt_expires *= HZ;
2134
2135 rt = addrconf_get_prefix_route(&pinfo->prefix,
2136 pinfo->prefix_len,
2137 dev,
2138 RTF_ADDRCONF | RTF_PREFIX_RT,
2139 RTF_GATEWAY | RTF_DEFAULT);
2140
2141 if (rt) {
2142 /* Autoconf prefix route */
2143 if (valid_lft == 0) {
2144 ip6_del_rt(rt);
2145 rt = NULL;
2146 } else if (addrconf_finite_timeout(rt_expires)) {
2147 /* not infinity */
2148 rt6_set_expires(rt, jiffies + rt_expires);
2149 } else {
2150 rt6_clean_expires(rt);
2151 }
2152 } else if (valid_lft) {
2153 clock_t expires = 0;
2154 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2155 if (addrconf_finite_timeout(rt_expires)) {
2156 /* not infinity */
2157 flags |= RTF_EXPIRES;
2158 expires = jiffies_to_clock_t(rt_expires);
2159 }
2160 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2161 dev, expires, flags);
2162 }
2163 ip6_rt_put(rt);
2164 }
2165
2166 /* Try to figure out our local address for this prefix */
2167
2168 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2169 struct inet6_ifaddr *ifp;
2170 struct in6_addr addr;
2171 int create = 0, update_lft = 0;
2172 bool tokenized = false;
2173
2174 if (pinfo->prefix_len == 64) {
2175 memcpy(&addr, &pinfo->prefix, 8);
2176
2177 if (!ipv6_addr_any(&in6_dev->token)) {
2178 read_lock_bh(&in6_dev->lock);
2179 memcpy(addr.s6_addr + 8,
2180 in6_dev->token.s6_addr + 8, 8);
2181 read_unlock_bh(&in6_dev->lock);
2182 tokenized = true;
2183 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2184 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2185 in6_dev_put(in6_dev);
2186 return;
2187 }
2188 goto ok;
2189 }
2190 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2191 pinfo->prefix_len);
2192 in6_dev_put(in6_dev);
2193 return;
2194
2195 ok:
2196
2197 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2198
2199 if (ifp == NULL && valid_lft) {
2200 int max_addresses = in6_dev->cnf.max_addresses;
2201 u32 addr_flags = 0;
2202
2203 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2204 if (in6_dev->cnf.optimistic_dad &&
2205 !net->ipv6.devconf_all->forwarding && sllao)
2206 addr_flags = IFA_F_OPTIMISTIC;
2207 #endif
2208
2209 /* Do not allow to create too much of autoconfigured
2210 * addresses; this would be too easy way to crash kernel.
2211 */
2212 if (!max_addresses ||
2213 ipv6_count_addresses(in6_dev) < max_addresses)
2214 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
2215 addr_type&IPV6_ADDR_SCOPE_MASK,
2216 addr_flags);
2217
2218 if (IS_ERR_OR_NULL(ifp)) {
2219 in6_dev_put(in6_dev);
2220 return;
2221 }
2222
2223 update_lft = create = 1;
2224 ifp->cstamp = jiffies;
2225 ifp->tokenized = tokenized;
2226 addrconf_dad_start(ifp);
2227 }
2228
2229 if (ifp) {
2230 int flags;
2231 unsigned long now;
2232 #ifdef CONFIG_IPV6_PRIVACY
2233 struct inet6_ifaddr *ift;
2234 #endif
2235 u32 stored_lft;
2236
2237 /* update lifetime (RFC2462 5.5.3 e) */
2238 spin_lock(&ifp->lock);
2239 now = jiffies;
2240 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2241 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2242 else
2243 stored_lft = 0;
2244 if (!update_lft && stored_lft) {
2245 if (valid_lft > MIN_VALID_LIFETIME ||
2246 valid_lft > stored_lft)
2247 update_lft = 1;
2248 else if (stored_lft <= MIN_VALID_LIFETIME) {
2249 /* valid_lft <= stored_lft is always true */
2250 /*
2251 * RFC 4862 Section 5.5.3e:
2252 * "Note that the preferred lifetime of
2253 * the corresponding address is always
2254 * reset to the Preferred Lifetime in
2255 * the received Prefix Information
2256 * option, regardless of whether the
2257 * valid lifetime is also reset or
2258 * ignored."
2259 *
2260 * So if the preferred lifetime in
2261 * this advertisement is different
2262 * than what we have stored, but the
2263 * valid lifetime is invalid, just
2264 * reset prefered_lft.
2265 *
2266 * We must set the valid lifetime
2267 * to the stored lifetime since we'll
2268 * be updating the timestamp below,
2269 * else we'll set it back to the
2270 * minimum.
2271 */
2272 if (prefered_lft != ifp->prefered_lft) {
2273 valid_lft = stored_lft;
2274 update_lft = 1;
2275 }
2276 } else {
2277 valid_lft = MIN_VALID_LIFETIME;
2278 if (valid_lft < prefered_lft)
2279 prefered_lft = valid_lft;
2280 update_lft = 1;
2281 }
2282 }
2283
2284 if (update_lft) {
2285 ifp->valid_lft = valid_lft;
2286 ifp->prefered_lft = prefered_lft;
2287 ifp->tstamp = now;
2288 flags = ifp->flags;
2289 ifp->flags &= ~IFA_F_DEPRECATED;
2290 spin_unlock(&ifp->lock);
2291
2292 if (!(flags&IFA_F_TENTATIVE))
2293 ipv6_ifa_notify(0, ifp);
2294 } else
2295 spin_unlock(&ifp->lock);
2296
2297 #ifdef CONFIG_IPV6_PRIVACY
2298 read_lock_bh(&in6_dev->lock);
2299 /* update all temporary addresses in the list */
2300 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2301 tmp_list) {
2302 int age, max_valid, max_prefered;
2303
2304 if (ifp != ift->ifpub)
2305 continue;
2306
2307 /*
2308 * RFC 4941 section 3.3:
2309 * If a received option will extend the lifetime
2310 * of a public address, the lifetimes of
2311 * temporary addresses should be extended,
2312 * subject to the overall constraint that no
2313 * temporary addresses should ever remain
2314 * "valid" or "preferred" for a time longer than
2315 * (TEMP_VALID_LIFETIME) or
2316 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2317 * respectively.
2318 */
2319 age = (now - ift->cstamp) / HZ;
2320 max_valid = in6_dev->cnf.temp_valid_lft - age;
2321 if (max_valid < 0)
2322 max_valid = 0;
2323
2324 max_prefered = in6_dev->cnf.temp_prefered_lft -
2325 in6_dev->cnf.max_desync_factor -
2326 age;
2327 if (max_prefered < 0)
2328 max_prefered = 0;
2329
2330 if (valid_lft > max_valid)
2331 valid_lft = max_valid;
2332
2333 if (prefered_lft > max_prefered)
2334 prefered_lft = max_prefered;
2335
2336 spin_lock(&ift->lock);
2337 flags = ift->flags;
2338 ift->valid_lft = valid_lft;
2339 ift->prefered_lft = prefered_lft;
2340 ift->tstamp = now;
2341 if (prefered_lft > 0)
2342 ift->flags &= ~IFA_F_DEPRECATED;
2343
2344 spin_unlock(&ift->lock);
2345 if (!(flags&IFA_F_TENTATIVE))
2346 ipv6_ifa_notify(0, ift);
2347 }
2348
2349 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2350 /*
2351 * When a new public address is created as
2352 * described in [ADDRCONF], also create a new
2353 * temporary address. Also create a temporary
2354 * address if it's enabled but no temporary
2355 * address currently exists.
2356 */
2357 read_unlock_bh(&in6_dev->lock);
2358 ipv6_create_tempaddr(ifp, NULL);
2359 } else {
2360 read_unlock_bh(&in6_dev->lock);
2361 }
2362 #endif
2363 in6_ifa_put(ifp);
2364 addrconf_verify(0);
2365 }
2366 }
2367 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2368 in6_dev_put(in6_dev);
2369 }
2370
2371 /*
2372 * Set destination address.
2373 * Special case for SIT interfaces where we create a new "virtual"
2374 * device.
2375 */
2376 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2377 {
2378 struct in6_ifreq ireq;
2379 struct net_device *dev;
2380 int err = -EINVAL;
2381
2382 rtnl_lock();
2383
2384 err = -EFAULT;
2385 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2386 goto err_exit;
2387
2388 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2389
2390 err = -ENODEV;
2391 if (dev == NULL)
2392 goto err_exit;
2393
2394 #if IS_ENABLED(CONFIG_IPV6_SIT)
2395 if (dev->type == ARPHRD_SIT) {
2396 const struct net_device_ops *ops = dev->netdev_ops;
2397 struct ifreq ifr;
2398 struct ip_tunnel_parm p;
2399
2400 err = -EADDRNOTAVAIL;
2401 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2402 goto err_exit;
2403
2404 memset(&p, 0, sizeof(p));
2405 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2406 p.iph.saddr = 0;
2407 p.iph.version = 4;
2408 p.iph.ihl = 5;
2409 p.iph.protocol = IPPROTO_IPV6;
2410 p.iph.ttl = 64;
2411 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2412
2413 if (ops->ndo_do_ioctl) {
2414 mm_segment_t oldfs = get_fs();
2415
2416 set_fs(KERNEL_DS);
2417 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2418 set_fs(oldfs);
2419 } else
2420 err = -EOPNOTSUPP;
2421
2422 if (err == 0) {
2423 err = -ENOBUFS;
2424 dev = __dev_get_by_name(net, p.name);
2425 if (!dev)
2426 goto err_exit;
2427 err = dev_open(dev);
2428 }
2429 }
2430 #endif
2431
2432 err_exit:
2433 rtnl_unlock();
2434 return err;
2435 }
2436
2437 /*
2438 * Manual configuration of address on an interface
2439 */
2440 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2441 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2442 __u32 valid_lft)
2443 {
2444 struct inet6_ifaddr *ifp;
2445 struct inet6_dev *idev;
2446 struct net_device *dev;
2447 int scope;
2448 u32 flags;
2449 clock_t expires;
2450 unsigned long timeout;
2451
2452 ASSERT_RTNL();
2453
2454 if (plen > 128)
2455 return -EINVAL;
2456
2457 /* check the lifetime */
2458 if (!valid_lft || prefered_lft > valid_lft)
2459 return -EINVAL;
2460
2461 dev = __dev_get_by_index(net, ifindex);
2462 if (!dev)
2463 return -ENODEV;
2464
2465 idev = addrconf_add_dev(dev);
2466 if (IS_ERR(idev))
2467 return PTR_ERR(idev);
2468
2469 scope = ipv6_addr_scope(pfx);
2470
2471 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2472 if (addrconf_finite_timeout(timeout)) {
2473 expires = jiffies_to_clock_t(timeout * HZ);
2474 valid_lft = timeout;
2475 flags = RTF_EXPIRES;
2476 } else {
2477 expires = 0;
2478 flags = 0;
2479 ifa_flags |= IFA_F_PERMANENT;
2480 }
2481
2482 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2483 if (addrconf_finite_timeout(timeout)) {
2484 if (timeout == 0)
2485 ifa_flags |= IFA_F_DEPRECATED;
2486 prefered_lft = timeout;
2487 }
2488
2489 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2490
2491 if (!IS_ERR(ifp)) {
2492 spin_lock_bh(&ifp->lock);
2493 ifp->valid_lft = valid_lft;
2494 ifp->prefered_lft = prefered_lft;
2495 ifp->tstamp = jiffies;
2496 spin_unlock_bh(&ifp->lock);
2497
2498 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2499 expires, flags);
2500 /*
2501 * Note that section 3.1 of RFC 4429 indicates
2502 * that the Optimistic flag should not be set for
2503 * manually configured addresses
2504 */
2505 addrconf_dad_start(ifp);
2506 in6_ifa_put(ifp);
2507 addrconf_verify(0);
2508 return 0;
2509 }
2510
2511 return PTR_ERR(ifp);
2512 }
2513
2514 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2515 unsigned int plen)
2516 {
2517 struct inet6_ifaddr *ifp;
2518 struct inet6_dev *idev;
2519 struct net_device *dev;
2520
2521 if (plen > 128)
2522 return -EINVAL;
2523
2524 dev = __dev_get_by_index(net, ifindex);
2525 if (!dev)
2526 return -ENODEV;
2527
2528 if ((idev = __in6_dev_get(dev)) == NULL)
2529 return -ENXIO;
2530
2531 read_lock_bh(&idev->lock);
2532 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2533 if (ifp->prefix_len == plen &&
2534 ipv6_addr_equal(pfx, &ifp->addr)) {
2535 in6_ifa_hold(ifp);
2536 read_unlock_bh(&idev->lock);
2537
2538 ipv6_del_addr(ifp);
2539
2540 /* If the last address is deleted administratively,
2541 disable IPv6 on this interface.
2542 */
2543 if (list_empty(&idev->addr_list))
2544 addrconf_ifdown(idev->dev, 1);
2545 return 0;
2546 }
2547 }
2548 read_unlock_bh(&idev->lock);
2549 return -EADDRNOTAVAIL;
2550 }
2551
2552
2553 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2554 {
2555 struct in6_ifreq ireq;
2556 int err;
2557
2558 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2559 return -EPERM;
2560
2561 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2562 return -EFAULT;
2563
2564 rtnl_lock();
2565 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2566 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2567 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2568 rtnl_unlock();
2569 return err;
2570 }
2571
2572 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2573 {
2574 struct in6_ifreq ireq;
2575 int err;
2576
2577 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2578 return -EPERM;
2579
2580 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2581 return -EFAULT;
2582
2583 rtnl_lock();
2584 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2585 ireq.ifr6_prefixlen);
2586 rtnl_unlock();
2587 return err;
2588 }
2589
2590 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2591 int plen, int scope)
2592 {
2593 struct inet6_ifaddr *ifp;
2594
2595 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2596 if (!IS_ERR(ifp)) {
2597 spin_lock_bh(&ifp->lock);
2598 ifp->flags &= ~IFA_F_TENTATIVE;
2599 spin_unlock_bh(&ifp->lock);
2600 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2601 in6_ifa_put(ifp);
2602 }
2603 }
2604
2605 #if IS_ENABLED(CONFIG_IPV6_SIT)
2606 static void sit_add_v4_addrs(struct inet6_dev *idev)
2607 {
2608 struct in6_addr addr;
2609 struct net_device *dev;
2610 struct net *net = dev_net(idev->dev);
2611 int scope;
2612
2613 ASSERT_RTNL();
2614
2615 memset(&addr, 0, sizeof(struct in6_addr));
2616 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2617
2618 if (idev->dev->flags&IFF_POINTOPOINT) {
2619 addr.s6_addr32[0] = htonl(0xfe800000);
2620 scope = IFA_LINK;
2621 } else {
2622 scope = IPV6_ADDR_COMPATv4;
2623 }
2624
2625 if (addr.s6_addr32[3]) {
2626 add_addr(idev, &addr, 128, scope);
2627 return;
2628 }
2629
2630 for_each_netdev(net, dev) {
2631 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2632 if (in_dev && (dev->flags & IFF_UP)) {
2633 struct in_ifaddr *ifa;
2634
2635 int flag = scope;
2636
2637 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2638 int plen;
2639
2640 addr.s6_addr32[3] = ifa->ifa_local;
2641
2642 if (ifa->ifa_scope == RT_SCOPE_LINK)
2643 continue;
2644 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2645 if (idev->dev->flags&IFF_POINTOPOINT)
2646 continue;
2647 flag |= IFA_HOST;
2648 }
2649 if (idev->dev->flags&IFF_POINTOPOINT)
2650 plen = 64;
2651 else
2652 plen = 96;
2653
2654 add_addr(idev, &addr, plen, flag);
2655 }
2656 }
2657 }
2658 }
2659 #endif
2660
2661 static void init_loopback(struct net_device *dev)
2662 {
2663 struct inet6_dev *idev;
2664 struct net_device *sp_dev;
2665 struct inet6_ifaddr *sp_ifa;
2666 struct rt6_info *sp_rt;
2667
2668 /* ::1 */
2669
2670 ASSERT_RTNL();
2671
2672 if ((idev = ipv6_find_idev(dev)) == NULL) {
2673 pr_debug("%s: add_dev failed\n", __func__);
2674 return;
2675 }
2676
2677 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2678
2679 /* Add routes to other interface's IPv6 addresses */
2680 for_each_netdev(dev_net(dev), sp_dev) {
2681 if (!strcmp(sp_dev->name, dev->name))
2682 continue;
2683
2684 idev = __in6_dev_get(sp_dev);
2685 if (!idev)
2686 continue;
2687
2688 read_lock_bh(&idev->lock);
2689 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2690
2691 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2692 continue;
2693
2694 if (sp_ifa->rt) {
2695 /* This dst has been added to garbage list when
2696 * lo device down, release this obsolete dst and
2697 * reallocate a new router for ifa.
2698 */
2699 if (sp_ifa->rt->dst.obsolete > 0) {
2700 ip6_rt_put(sp_ifa->rt);
2701 sp_ifa->rt = NULL;
2702 } else {
2703 continue;
2704 }
2705 }
2706
2707 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2708
2709 /* Failure cases are ignored */
2710 if (!IS_ERR(sp_rt)) {
2711 sp_ifa->rt = sp_rt;
2712 ip6_ins_rt(sp_rt);
2713 }
2714 }
2715 read_unlock_bh(&idev->lock);
2716 }
2717 }
2718
2719 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2720 {
2721 struct inet6_ifaddr *ifp;
2722 u32 addr_flags = IFA_F_PERMANENT;
2723
2724 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2725 if (idev->cnf.optimistic_dad &&
2726 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2727 addr_flags |= IFA_F_OPTIMISTIC;
2728 #endif
2729
2730
2731 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2732 if (!IS_ERR(ifp)) {
2733 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2734 addrconf_dad_start(ifp);
2735 in6_ifa_put(ifp);
2736 }
2737 }
2738
2739 static void addrconf_dev_config(struct net_device *dev)
2740 {
2741 struct in6_addr addr;
2742 struct inet6_dev *idev;
2743
2744 ASSERT_RTNL();
2745
2746 if ((dev->type != ARPHRD_ETHER) &&
2747 (dev->type != ARPHRD_FDDI) &&
2748 (dev->type != ARPHRD_ARCNET) &&
2749 (dev->type != ARPHRD_INFINIBAND) &&
2750 (dev->type != ARPHRD_IEEE802154) &&
2751 (dev->type != ARPHRD_IEEE1394)) {
2752 /* Alas, we support only Ethernet autoconfiguration. */
2753 return;
2754 }
2755
2756 idev = addrconf_add_dev(dev);
2757 if (IS_ERR(idev))
2758 return;
2759
2760 memset(&addr, 0, sizeof(struct in6_addr));
2761 addr.s6_addr32[0] = htonl(0xFE800000);
2762
2763 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2764 addrconf_add_linklocal(idev, &addr);
2765 }
2766
2767 #if IS_ENABLED(CONFIG_IPV6_SIT)
2768 static void addrconf_sit_config(struct net_device *dev)
2769 {
2770 struct inet6_dev *idev;
2771
2772 ASSERT_RTNL();
2773
2774 /*
2775 * Configure the tunnel with one of our IPv4
2776 * addresses... we should configure all of
2777 * our v4 addrs in the tunnel
2778 */
2779
2780 if ((idev = ipv6_find_idev(dev)) == NULL) {
2781 pr_debug("%s: add_dev failed\n", __func__);
2782 return;
2783 }
2784
2785 if (dev->priv_flags & IFF_ISATAP) {
2786 struct in6_addr addr;
2787
2788 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2789 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2790 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2791 addrconf_add_linklocal(idev, &addr);
2792 return;
2793 }
2794
2795 sit_add_v4_addrs(idev);
2796
2797 if (dev->flags&IFF_POINTOPOINT)
2798 addrconf_add_mroute(dev);
2799 else
2800 sit_route_add(dev);
2801 }
2802 #endif
2803
2804 #if IS_ENABLED(CONFIG_NET_IPGRE)
2805 static void addrconf_gre_config(struct net_device *dev)
2806 {
2807 struct inet6_dev *idev;
2808 struct in6_addr addr;
2809
2810 pr_info("%s(%s)\n", __func__, dev->name);
2811
2812 ASSERT_RTNL();
2813
2814 if ((idev = ipv6_find_idev(dev)) == NULL) {
2815 pr_debug("%s: add_dev failed\n", __func__);
2816 return;
2817 }
2818
2819 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2820 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2821
2822 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2823 addrconf_add_linklocal(idev, &addr);
2824 }
2825 #endif
2826
2827 static inline int
2828 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2829 {
2830 struct in6_addr lladdr;
2831
2832 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2833 addrconf_add_linklocal(idev, &lladdr);
2834 return 0;
2835 }
2836 return -1;
2837 }
2838
2839 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2840 {
2841 struct net_device *link_dev;
2842 struct net *net = dev_net(idev->dev);
2843
2844 /* first try to inherit the link-local address from the link device */
2845 if (idev->dev->iflink &&
2846 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2847 if (!ipv6_inherit_linklocal(idev, link_dev))
2848 return;
2849 }
2850 /* then try to inherit it from any device */
2851 for_each_netdev(net, link_dev) {
2852 if (!ipv6_inherit_linklocal(idev, link_dev))
2853 return;
2854 }
2855 pr_debug("init ip6-ip6: add_linklocal failed\n");
2856 }
2857
2858 /*
2859 * Autoconfigure tunnel with a link-local address so routing protocols,
2860 * DHCPv6, MLD etc. can be run over the virtual link
2861 */
2862
2863 static void addrconf_ip6_tnl_config(struct net_device *dev)
2864 {
2865 struct inet6_dev *idev;
2866
2867 ASSERT_RTNL();
2868
2869 idev = addrconf_add_dev(dev);
2870 if (IS_ERR(idev)) {
2871 pr_debug("init ip6-ip6: add_dev failed\n");
2872 return;
2873 }
2874 ip6_tnl_add_linklocal(idev);
2875 }
2876
2877 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2878 void *data)
2879 {
2880 struct net_device *dev = (struct net_device *) data;
2881 struct inet6_dev *idev = __in6_dev_get(dev);
2882 int run_pending = 0;
2883 int err;
2884
2885 switch (event) {
2886 case NETDEV_REGISTER:
2887 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2888 idev = ipv6_add_dev(dev);
2889 if (!idev)
2890 return notifier_from_errno(-ENOMEM);
2891 }
2892 break;
2893
2894 case NETDEV_UP:
2895 case NETDEV_CHANGE:
2896 if (dev->flags & IFF_SLAVE)
2897 break;
2898
2899 if (event == NETDEV_UP) {
2900 if (!addrconf_qdisc_ok(dev)) {
2901 /* device is not ready yet. */
2902 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2903 dev->name);
2904 break;
2905 }
2906
2907 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2908 idev = ipv6_add_dev(dev);
2909
2910 if (idev) {
2911 idev->if_flags |= IF_READY;
2912 run_pending = 1;
2913 }
2914 } else {
2915 if (!addrconf_qdisc_ok(dev)) {
2916 /* device is still not ready. */
2917 break;
2918 }
2919
2920 if (idev) {
2921 if (idev->if_flags & IF_READY)
2922 /* device is already configured. */
2923 break;
2924 idev->if_flags |= IF_READY;
2925 }
2926
2927 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2928 dev->name);
2929
2930 run_pending = 1;
2931 }
2932
2933 switch (dev->type) {
2934 #if IS_ENABLED(CONFIG_IPV6_SIT)
2935 case ARPHRD_SIT:
2936 addrconf_sit_config(dev);
2937 break;
2938 #endif
2939 #if IS_ENABLED(CONFIG_NET_IPGRE)
2940 case ARPHRD_IPGRE:
2941 addrconf_gre_config(dev);
2942 break;
2943 #endif
2944 case ARPHRD_TUNNEL6:
2945 addrconf_ip6_tnl_config(dev);
2946 break;
2947 case ARPHRD_LOOPBACK:
2948 init_loopback(dev);
2949 break;
2950
2951 default:
2952 addrconf_dev_config(dev);
2953 break;
2954 }
2955
2956 if (idev) {
2957 if (run_pending)
2958 addrconf_dad_run(idev);
2959
2960 /*
2961 * If the MTU changed during the interface down,
2962 * when the interface up, the changed MTU must be
2963 * reflected in the idev as well as routers.
2964 */
2965 if (idev->cnf.mtu6 != dev->mtu &&
2966 dev->mtu >= IPV6_MIN_MTU) {
2967 rt6_mtu_change(dev, dev->mtu);
2968 idev->cnf.mtu6 = dev->mtu;
2969 }
2970 idev->tstamp = jiffies;
2971 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2972
2973 /*
2974 * If the changed mtu during down is lower than
2975 * IPV6_MIN_MTU stop IPv6 on this interface.
2976 */
2977 if (dev->mtu < IPV6_MIN_MTU)
2978 addrconf_ifdown(dev, 1);
2979 }
2980 break;
2981
2982 case NETDEV_CHANGEMTU:
2983 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2984 rt6_mtu_change(dev, dev->mtu);
2985 idev->cnf.mtu6 = dev->mtu;
2986 break;
2987 }
2988
2989 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2990 idev = ipv6_add_dev(dev);
2991 if (idev)
2992 break;
2993 }
2994
2995 /*
2996 * MTU falled under IPV6_MIN_MTU.
2997 * Stop IPv6 on this interface.
2998 */
2999
3000 case NETDEV_DOWN:
3001 case NETDEV_UNREGISTER:
3002 /*
3003 * Remove all addresses from this interface.
3004 */
3005 addrconf_ifdown(dev, event != NETDEV_DOWN);
3006 break;
3007
3008 case NETDEV_CHANGENAME:
3009 if (idev) {
3010 snmp6_unregister_dev(idev);
3011 addrconf_sysctl_unregister(idev);
3012 addrconf_sysctl_register(idev);
3013 err = snmp6_register_dev(idev);
3014 if (err)
3015 return notifier_from_errno(err);
3016 }
3017 break;
3018
3019 case NETDEV_PRE_TYPE_CHANGE:
3020 case NETDEV_POST_TYPE_CHANGE:
3021 addrconf_type_change(dev, event);
3022 break;
3023 }
3024
3025 return NOTIFY_OK;
3026 }
3027
3028 /*
3029 * addrconf module should be notified of a device going up
3030 */
3031 static struct notifier_block ipv6_dev_notf = {
3032 .notifier_call = addrconf_notify,
3033 };
3034
3035 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3036 {
3037 struct inet6_dev *idev;
3038 ASSERT_RTNL();
3039
3040 idev = __in6_dev_get(dev);
3041
3042 if (event == NETDEV_POST_TYPE_CHANGE)
3043 ipv6_mc_remap(idev);
3044 else if (event == NETDEV_PRE_TYPE_CHANGE)
3045 ipv6_mc_unmap(idev);
3046 }
3047
3048 static int addrconf_ifdown(struct net_device *dev, int how)
3049 {
3050 struct net *net = dev_net(dev);
3051 struct inet6_dev *idev;
3052 struct inet6_ifaddr *ifa;
3053 int state, i;
3054
3055 ASSERT_RTNL();
3056
3057 rt6_ifdown(net, dev);
3058 neigh_ifdown(&nd_tbl, dev);
3059
3060 idev = __in6_dev_get(dev);
3061 if (idev == NULL)
3062 return -ENODEV;
3063
3064 /*
3065 * Step 1: remove reference to ipv6 device from parent device.
3066 * Do not dev_put!
3067 */
3068 if (how) {
3069 idev->dead = 1;
3070
3071 /* protected by rtnl_lock */
3072 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3073
3074 /* Step 1.5: remove snmp6 entry */
3075 snmp6_unregister_dev(idev);
3076
3077 }
3078
3079 /* Step 2: clear hash table */
3080 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3081 struct hlist_head *h = &inet6_addr_lst[i];
3082
3083 spin_lock_bh(&addrconf_hash_lock);
3084 restart:
3085 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3086 if (ifa->idev == idev) {
3087 hlist_del_init_rcu(&ifa->addr_lst);
3088 addrconf_del_timer(ifa);
3089 goto restart;
3090 }
3091 }
3092 spin_unlock_bh(&addrconf_hash_lock);
3093 }
3094
3095 write_lock_bh(&idev->lock);
3096
3097 /* Step 2: clear flags for stateless addrconf */
3098 if (!how)
3099 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3100
3101 #ifdef CONFIG_IPV6_PRIVACY
3102 if (how && del_timer(&idev->regen_timer))
3103 in6_dev_put(idev);
3104
3105 /* Step 3: clear tempaddr list */
3106 while (!list_empty(&idev->tempaddr_list)) {
3107 ifa = list_first_entry(&idev->tempaddr_list,
3108 struct inet6_ifaddr, tmp_list);
3109 list_del(&ifa->tmp_list);
3110 write_unlock_bh(&idev->lock);
3111 spin_lock_bh(&ifa->lock);
3112
3113 if (ifa->ifpub) {
3114 in6_ifa_put(ifa->ifpub);
3115 ifa->ifpub = NULL;
3116 }
3117 spin_unlock_bh(&ifa->lock);
3118 in6_ifa_put(ifa);
3119 write_lock_bh(&idev->lock);
3120 }
3121 #endif
3122
3123 while (!list_empty(&idev->addr_list)) {
3124 ifa = list_first_entry(&idev->addr_list,
3125 struct inet6_ifaddr, if_list);
3126 addrconf_del_timer(ifa);
3127
3128 list_del(&ifa->if_list);
3129
3130 write_unlock_bh(&idev->lock);
3131
3132 spin_lock_bh(&ifa->state_lock);
3133 state = ifa->state;
3134 ifa->state = INET6_IFADDR_STATE_DEAD;
3135 spin_unlock_bh(&ifa->state_lock);
3136
3137 if (state != INET6_IFADDR_STATE_DEAD) {
3138 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3139 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3140 }
3141 in6_ifa_put(ifa);
3142
3143 write_lock_bh(&idev->lock);
3144 }
3145
3146 write_unlock_bh(&idev->lock);
3147
3148 /* Step 5: Discard multicast list */
3149 if (how)
3150 ipv6_mc_destroy_dev(idev);
3151 else
3152 ipv6_mc_down(idev);
3153
3154 idev->tstamp = jiffies;
3155
3156 /* Last: Shot the device (if unregistered) */
3157 if (how) {
3158 addrconf_sysctl_unregister(idev);
3159 neigh_parms_release(&nd_tbl, idev->nd_parms);
3160 neigh_ifdown(&nd_tbl, dev);
3161 in6_dev_put(idev);
3162 }
3163 return 0;
3164 }
3165
3166 static void addrconf_rs_timer(unsigned long data)
3167 {
3168 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3169 struct inet6_dev *idev = ifp->idev;
3170
3171 read_lock(&idev->lock);
3172 if (idev->dead || !(idev->if_flags & IF_READY))
3173 goto out;
3174
3175 if (!ipv6_accept_ra(idev))
3176 goto out;
3177
3178 /* Announcement received after solicitation was sent */
3179 if (idev->if_flags & IF_RA_RCVD)
3180 goto out;
3181
3182 spin_lock(&ifp->lock);
3183 if (ifp->probes++ < idev->cnf.rtr_solicits) {
3184 /* The wait after the last probe can be shorter */
3185 addrconf_mod_timer(ifp, AC_RS,
3186 (ifp->probes == idev->cnf.rtr_solicits) ?
3187 idev->cnf.rtr_solicit_delay :
3188 idev->cnf.rtr_solicit_interval);
3189 spin_unlock(&ifp->lock);
3190
3191 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3192 } else {
3193 spin_unlock(&ifp->lock);
3194 /*
3195 * Note: we do not support deprecated "all on-link"
3196 * assumption any longer.
3197 */
3198 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3199 }
3200
3201 out:
3202 read_unlock(&idev->lock);
3203 in6_ifa_put(ifp);
3204 }
3205
3206 /*
3207 * Duplicate Address Detection
3208 */
3209 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3210 {
3211 unsigned long rand_num;
3212 struct inet6_dev *idev = ifp->idev;
3213
3214 if (ifp->flags & IFA_F_OPTIMISTIC)
3215 rand_num = 0;
3216 else
3217 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3218
3219 ifp->probes = idev->cnf.dad_transmits;
3220 addrconf_mod_timer(ifp, AC_DAD, rand_num);
3221 }
3222
3223 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3224 {
3225 struct inet6_dev *idev = ifp->idev;
3226 struct net_device *dev = idev->dev;
3227
3228 addrconf_join_solict(dev, &ifp->addr);
3229
3230 net_srandom(ifp->addr.s6_addr32[3]);
3231
3232 read_lock_bh(&idev->lock);
3233 spin_lock(&ifp->lock);
3234 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3235 goto out;
3236
3237 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3238 idev->cnf.accept_dad < 1 ||
3239 !(ifp->flags&IFA_F_TENTATIVE) ||
3240 ifp->flags & IFA_F_NODAD) {
3241 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3242 spin_unlock(&ifp->lock);
3243 read_unlock_bh(&idev->lock);
3244
3245 addrconf_dad_completed(ifp);
3246 return;
3247 }
3248
3249 if (!(idev->if_flags & IF_READY)) {
3250 spin_unlock(&ifp->lock);
3251 read_unlock_bh(&idev->lock);
3252 /*
3253 * If the device is not ready:
3254 * - keep it tentative if it is a permanent address.
3255 * - otherwise, kill it.
3256 */
3257 in6_ifa_hold(ifp);
3258 addrconf_dad_stop(ifp, 0);
3259 return;
3260 }
3261
3262 /*
3263 * Optimistic nodes can start receiving
3264 * Frames right away
3265 */
3266 if (ifp->flags & IFA_F_OPTIMISTIC)
3267 ip6_ins_rt(ifp->rt);
3268
3269 addrconf_dad_kick(ifp);
3270 out:
3271 spin_unlock(&ifp->lock);
3272 read_unlock_bh(&idev->lock);
3273 }
3274
3275 static void addrconf_dad_timer(unsigned long data)
3276 {
3277 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3278 struct inet6_dev *idev = ifp->idev;
3279 struct in6_addr mcaddr;
3280
3281 if (!ifp->probes && addrconf_dad_end(ifp))
3282 goto out;
3283
3284 read_lock(&idev->lock);
3285 if (idev->dead || !(idev->if_flags & IF_READY)) {
3286 read_unlock(&idev->lock);
3287 goto out;
3288 }
3289
3290 spin_lock(&ifp->lock);
3291 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3292 spin_unlock(&ifp->lock);
3293 read_unlock(&idev->lock);
3294 goto out;
3295 }
3296
3297 if (ifp->probes == 0) {
3298 /*
3299 * DAD was successful
3300 */
3301
3302 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3303 spin_unlock(&ifp->lock);
3304 read_unlock(&idev->lock);
3305
3306 addrconf_dad_completed(ifp);
3307
3308 goto out;
3309 }
3310
3311 ifp->probes--;
3312 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3313 spin_unlock(&ifp->lock);
3314 read_unlock(&idev->lock);
3315
3316 /* send a neighbour solicitation for our addr */
3317 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3318 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3319 out:
3320 in6_ifa_put(ifp);
3321 }
3322
3323 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3324 {
3325 struct net_device *dev = ifp->idev->dev;
3326
3327 /*
3328 * Configure the address for reception. Now it is valid.
3329 */
3330
3331 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3332
3333 /* If added prefix is link local and we are prepared to process
3334 router advertisements, start sending router solicitations.
3335 */
3336
3337 if (ipv6_accept_ra(ifp->idev) &&
3338 ifp->idev->cnf.rtr_solicits > 0 &&
3339 (dev->flags&IFF_LOOPBACK) == 0 &&
3340 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3341 /*
3342 * If a host as already performed a random delay
3343 * [...] as part of DAD [...] there is no need
3344 * to delay again before sending the first RS
3345 */
3346 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3347
3348 spin_lock_bh(&ifp->lock);
3349 ifp->probes = 1;
3350 ifp->idev->if_flags |= IF_RS_SENT;
3351 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3352 spin_unlock_bh(&ifp->lock);
3353 }
3354 }
3355
3356 static void addrconf_dad_run(struct inet6_dev *idev)
3357 {
3358 struct inet6_ifaddr *ifp;
3359
3360 read_lock_bh(&idev->lock);
3361 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3362 spin_lock(&ifp->lock);
3363 if (ifp->flags & IFA_F_TENTATIVE &&
3364 ifp->state == INET6_IFADDR_STATE_DAD)
3365 addrconf_dad_kick(ifp);
3366 spin_unlock(&ifp->lock);
3367 }
3368 read_unlock_bh(&idev->lock);
3369 }
3370
3371 #ifdef CONFIG_PROC_FS
3372 struct if6_iter_state {
3373 struct seq_net_private p;
3374 int bucket;
3375 int offset;
3376 };
3377
3378 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3379 {
3380 struct inet6_ifaddr *ifa = NULL;
3381 struct if6_iter_state *state = seq->private;
3382 struct net *net = seq_file_net(seq);
3383 int p = 0;
3384
3385 /* initial bucket if pos is 0 */
3386 if (pos == 0) {
3387 state->bucket = 0;
3388 state->offset = 0;
3389 }
3390
3391 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3392 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3393 addr_lst) {
3394 if (!net_eq(dev_net(ifa->idev->dev), net))
3395 continue;
3396 /* sync with offset */
3397 if (p < state->offset) {
3398 p++;
3399 continue;
3400 }
3401 state->offset++;
3402 return ifa;
3403 }
3404
3405 /* prepare for next bucket */
3406 state->offset = 0;
3407 p = 0;
3408 }
3409 return NULL;
3410 }
3411
3412 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3413 struct inet6_ifaddr *ifa)
3414 {
3415 struct if6_iter_state *state = seq->private;
3416 struct net *net = seq_file_net(seq);
3417
3418 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3419 if (!net_eq(dev_net(ifa->idev->dev), net))
3420 continue;
3421 state->offset++;
3422 return ifa;
3423 }
3424
3425 while (++state->bucket < IN6_ADDR_HSIZE) {
3426 state->offset = 0;
3427 hlist_for_each_entry_rcu_bh(ifa,
3428 &inet6_addr_lst[state->bucket], addr_lst) {
3429 if (!net_eq(dev_net(ifa->idev->dev), net))
3430 continue;
3431 state->offset++;
3432 return ifa;
3433 }
3434 }
3435
3436 return NULL;
3437 }
3438
3439 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3440 __acquires(rcu_bh)
3441 {
3442 rcu_read_lock_bh();
3443 return if6_get_first(seq, *pos);
3444 }
3445
3446 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3447 {
3448 struct inet6_ifaddr *ifa;
3449
3450 ifa = if6_get_next(seq, v);
3451 ++*pos;
3452 return ifa;
3453 }
3454
3455 static void if6_seq_stop(struct seq_file *seq, void *v)
3456 __releases(rcu_bh)
3457 {
3458 rcu_read_unlock_bh();
3459 }
3460
3461 static int if6_seq_show(struct seq_file *seq, void *v)
3462 {
3463 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3464 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3465 &ifp->addr,
3466 ifp->idev->dev->ifindex,
3467 ifp->prefix_len,
3468 ifp->scope,
3469 ifp->flags,
3470 ifp->idev->dev->name);
3471 return 0;
3472 }
3473
3474 static const struct seq_operations if6_seq_ops = {
3475 .start = if6_seq_start,
3476 .next = if6_seq_next,
3477 .show = if6_seq_show,
3478 .stop = if6_seq_stop,
3479 };
3480
3481 static int if6_seq_open(struct inode *inode, struct file *file)
3482 {
3483 return seq_open_net(inode, file, &if6_seq_ops,
3484 sizeof(struct if6_iter_state));
3485 }
3486
3487 static const struct file_operations if6_fops = {
3488 .owner = THIS_MODULE,
3489 .open = if6_seq_open,
3490 .read = seq_read,
3491 .llseek = seq_lseek,
3492 .release = seq_release_net,
3493 };
3494
3495 static int __net_init if6_proc_net_init(struct net *net)
3496 {
3497 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3498 return -ENOMEM;
3499 return 0;
3500 }
3501
3502 static void __net_exit if6_proc_net_exit(struct net *net)
3503 {
3504 remove_proc_entry("if_inet6", net->proc_net);
3505 }
3506
3507 static struct pernet_operations if6_proc_net_ops = {
3508 .init = if6_proc_net_init,
3509 .exit = if6_proc_net_exit,
3510 };
3511
3512 int __init if6_proc_init(void)
3513 {
3514 return register_pernet_subsys(&if6_proc_net_ops);
3515 }
3516
3517 void if6_proc_exit(void)
3518 {
3519 unregister_pernet_subsys(&if6_proc_net_ops);
3520 }
3521 #endif /* CONFIG_PROC_FS */
3522
3523 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3524 /* Check if address is a home address configured on any interface. */
3525 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3526 {
3527 int ret = 0;
3528 struct inet6_ifaddr *ifp = NULL;
3529 unsigned int hash = inet6_addr_hash(addr);
3530
3531 rcu_read_lock_bh();
3532 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3533 if (!net_eq(dev_net(ifp->idev->dev), net))
3534 continue;
3535 if (ipv6_addr_equal(&ifp->addr, addr) &&
3536 (ifp->flags & IFA_F_HOMEADDRESS)) {
3537 ret = 1;
3538 break;
3539 }
3540 }
3541 rcu_read_unlock_bh();
3542 return ret;
3543 }
3544 #endif
3545
3546 /*
3547 * Periodic address status verification
3548 */
3549
3550 static void addrconf_verify(unsigned long foo)
3551 {
3552 unsigned long now, next, next_sec, next_sched;
3553 struct inet6_ifaddr *ifp;
3554 int i;
3555
3556 rcu_read_lock_bh();
3557 spin_lock(&addrconf_verify_lock);
3558 now = jiffies;
3559 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3560
3561 del_timer(&addr_chk_timer);
3562
3563 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3564 restart:
3565 hlist_for_each_entry_rcu_bh(ifp,
3566 &inet6_addr_lst[i], addr_lst) {
3567 unsigned long age;
3568
3569 if (ifp->flags & IFA_F_PERMANENT)
3570 continue;
3571
3572 spin_lock(&ifp->lock);
3573 /* We try to batch several events at once. */
3574 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3575
3576 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3577 age >= ifp->valid_lft) {
3578 spin_unlock(&ifp->lock);
3579 in6_ifa_hold(ifp);
3580 ipv6_del_addr(ifp);
3581 goto restart;
3582 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3583 spin_unlock(&ifp->lock);
3584 continue;
3585 } else if (age >= ifp->prefered_lft) {
3586 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3587 int deprecate = 0;
3588
3589 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3590 deprecate = 1;
3591 ifp->flags |= IFA_F_DEPRECATED;
3592 }
3593
3594 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3595 next = ifp->tstamp + ifp->valid_lft * HZ;
3596
3597 spin_unlock(&ifp->lock);
3598
3599 if (deprecate) {
3600 in6_ifa_hold(ifp);
3601
3602 ipv6_ifa_notify(0, ifp);
3603 in6_ifa_put(ifp);
3604 goto restart;
3605 }
3606 #ifdef CONFIG_IPV6_PRIVACY
3607 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3608 !(ifp->flags&IFA_F_TENTATIVE)) {
3609 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3610 ifp->idev->cnf.dad_transmits *
3611 ifp->idev->nd_parms->retrans_time / HZ;
3612
3613 if (age >= ifp->prefered_lft - regen_advance) {
3614 struct inet6_ifaddr *ifpub = ifp->ifpub;
3615 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3616 next = ifp->tstamp + ifp->prefered_lft * HZ;
3617 if (!ifp->regen_count && ifpub) {
3618 ifp->regen_count++;
3619 in6_ifa_hold(ifp);
3620 in6_ifa_hold(ifpub);
3621 spin_unlock(&ifp->lock);
3622
3623 spin_lock(&ifpub->lock);
3624 ifpub->regen_count = 0;
3625 spin_unlock(&ifpub->lock);
3626 ipv6_create_tempaddr(ifpub, ifp);
3627 in6_ifa_put(ifpub);
3628 in6_ifa_put(ifp);
3629 goto restart;
3630 }
3631 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3632 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3633 spin_unlock(&ifp->lock);
3634 #endif
3635 } else {
3636 /* ifp->prefered_lft <= ifp->valid_lft */
3637 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3638 next = ifp->tstamp + ifp->prefered_lft * HZ;
3639 spin_unlock(&ifp->lock);
3640 }
3641 }
3642 }
3643
3644 next_sec = round_jiffies_up(next);
3645 next_sched = next;
3646
3647 /* If rounded timeout is accurate enough, accept it. */
3648 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3649 next_sched = next_sec;
3650
3651 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3652 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3653 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3654
3655 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3656 now, next, next_sec, next_sched));
3657
3658 addr_chk_timer.expires = next_sched;
3659 add_timer(&addr_chk_timer);
3660 spin_unlock(&addrconf_verify_lock);
3661 rcu_read_unlock_bh();
3662 }
3663
3664 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3665 {
3666 struct in6_addr *pfx = NULL;
3667
3668 if (addr)
3669 pfx = nla_data(addr);
3670
3671 if (local) {
3672 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3673 pfx = NULL;
3674 else
3675 pfx = nla_data(local);
3676 }
3677
3678 return pfx;
3679 }
3680
3681 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3682 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3683 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3684 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3685 };
3686
3687 static int
3688 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3689 {
3690 struct net *net = sock_net(skb->sk);
3691 struct ifaddrmsg *ifm;
3692 struct nlattr *tb[IFA_MAX+1];
3693 struct in6_addr *pfx;
3694 int err;
3695
3696 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3697 if (err < 0)
3698 return err;
3699
3700 ifm = nlmsg_data(nlh);
3701 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3702 if (pfx == NULL)
3703 return -EINVAL;
3704
3705 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3706 }
3707
3708 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3709 u32 prefered_lft, u32 valid_lft)
3710 {
3711 u32 flags;
3712 clock_t expires;
3713 unsigned long timeout;
3714
3715 if (!valid_lft || (prefered_lft > valid_lft))
3716 return -EINVAL;
3717
3718 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3719 if (addrconf_finite_timeout(timeout)) {
3720 expires = jiffies_to_clock_t(timeout * HZ);
3721 valid_lft = timeout;
3722 flags = RTF_EXPIRES;
3723 } else {
3724 expires = 0;
3725 flags = 0;
3726 ifa_flags |= IFA_F_PERMANENT;
3727 }
3728
3729 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3730 if (addrconf_finite_timeout(timeout)) {
3731 if (timeout == 0)
3732 ifa_flags |= IFA_F_DEPRECATED;
3733 prefered_lft = timeout;
3734 }
3735
3736 spin_lock_bh(&ifp->lock);
3737 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3738 ifp->tstamp = jiffies;
3739 ifp->valid_lft = valid_lft;
3740 ifp->prefered_lft = prefered_lft;
3741
3742 spin_unlock_bh(&ifp->lock);
3743 if (!(ifp->flags&IFA_F_TENTATIVE))
3744 ipv6_ifa_notify(0, ifp);
3745
3746 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3747 expires, flags);
3748 addrconf_verify(0);
3749
3750 return 0;
3751 }
3752
3753 static int
3754 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3755 {
3756 struct net *net = sock_net(skb->sk);
3757 struct ifaddrmsg *ifm;
3758 struct nlattr *tb[IFA_MAX+1];
3759 struct in6_addr *pfx;
3760 struct inet6_ifaddr *ifa;
3761 struct net_device *dev;
3762 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3763 u8 ifa_flags;
3764 int err;
3765
3766 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3767 if (err < 0)
3768 return err;
3769
3770 ifm = nlmsg_data(nlh);
3771 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3772 if (pfx == NULL)
3773 return -EINVAL;
3774
3775 if (tb[IFA_CACHEINFO]) {
3776 struct ifa_cacheinfo *ci;
3777
3778 ci = nla_data(tb[IFA_CACHEINFO]);
3779 valid_lft = ci->ifa_valid;
3780 preferred_lft = ci->ifa_prefered;
3781 } else {
3782 preferred_lft = INFINITY_LIFE_TIME;
3783 valid_lft = INFINITY_LIFE_TIME;
3784 }
3785
3786 dev = __dev_get_by_index(net, ifm->ifa_index);
3787 if (dev == NULL)
3788 return -ENODEV;
3789
3790 /* We ignore other flags so far. */
3791 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3792
3793 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3794 if (ifa == NULL) {
3795 /*
3796 * It would be best to check for !NLM_F_CREATE here but
3797 * userspace alreay relies on not having to provide this.
3798 */
3799 return inet6_addr_add(net, ifm->ifa_index, pfx,
3800 ifm->ifa_prefixlen, ifa_flags,
3801 preferred_lft, valid_lft);
3802 }
3803
3804 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3805 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3806 err = -EEXIST;
3807 else
3808 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3809
3810 in6_ifa_put(ifa);
3811
3812 return err;
3813 }
3814
3815 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3816 u8 scope, int ifindex)
3817 {
3818 struct ifaddrmsg *ifm;
3819
3820 ifm = nlmsg_data(nlh);
3821 ifm->ifa_family = AF_INET6;
3822 ifm->ifa_prefixlen = prefixlen;
3823 ifm->ifa_flags = flags;
3824 ifm->ifa_scope = scope;
3825 ifm->ifa_index = ifindex;
3826 }
3827
3828 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3829 unsigned long tstamp, u32 preferred, u32 valid)
3830 {
3831 struct ifa_cacheinfo ci;
3832
3833 ci.cstamp = cstamp_delta(cstamp);
3834 ci.tstamp = cstamp_delta(tstamp);
3835 ci.ifa_prefered = preferred;
3836 ci.ifa_valid = valid;
3837
3838 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3839 }
3840
3841 static inline int rt_scope(int ifa_scope)
3842 {
3843 if (ifa_scope & IFA_HOST)
3844 return RT_SCOPE_HOST;
3845 else if (ifa_scope & IFA_LINK)
3846 return RT_SCOPE_LINK;
3847 else if (ifa_scope & IFA_SITE)
3848 return RT_SCOPE_SITE;
3849 else
3850 return RT_SCOPE_UNIVERSE;
3851 }
3852
3853 static inline int inet6_ifaddr_msgsize(void)
3854 {
3855 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3856 + nla_total_size(16) /* IFA_ADDRESS */
3857 + nla_total_size(sizeof(struct ifa_cacheinfo));
3858 }
3859
3860 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3861 u32 portid, u32 seq, int event, unsigned int flags)
3862 {
3863 struct nlmsghdr *nlh;
3864 u32 preferred, valid;
3865
3866 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3867 if (nlh == NULL)
3868 return -EMSGSIZE;
3869
3870 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3871 ifa->idev->dev->ifindex);
3872
3873 if (!(ifa->flags&IFA_F_PERMANENT)) {
3874 preferred = ifa->prefered_lft;
3875 valid = ifa->valid_lft;
3876 if (preferred != INFINITY_LIFE_TIME) {
3877 long tval = (jiffies - ifa->tstamp)/HZ;
3878 if (preferred > tval)
3879 preferred -= tval;
3880 else
3881 preferred = 0;
3882 if (valid != INFINITY_LIFE_TIME) {
3883 if (valid > tval)
3884 valid -= tval;
3885 else
3886 valid = 0;
3887 }
3888 }
3889 } else {
3890 preferred = INFINITY_LIFE_TIME;
3891 valid = INFINITY_LIFE_TIME;
3892 }
3893
3894 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3895 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3896 nlmsg_cancel(skb, nlh);
3897 return -EMSGSIZE;
3898 }
3899
3900 return nlmsg_end(skb, nlh);
3901 }
3902
3903 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3904 u32 portid, u32 seq, int event, u16 flags)
3905 {
3906 struct nlmsghdr *nlh;
3907 u8 scope = RT_SCOPE_UNIVERSE;
3908 int ifindex = ifmca->idev->dev->ifindex;
3909
3910 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3911 scope = RT_SCOPE_SITE;
3912
3913 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3914 if (nlh == NULL)
3915 return -EMSGSIZE;
3916
3917 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3918 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3919 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3920 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3921 nlmsg_cancel(skb, nlh);
3922 return -EMSGSIZE;
3923 }
3924
3925 return nlmsg_end(skb, nlh);
3926 }
3927
3928 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3929 u32 portid, u32 seq, int event, unsigned int flags)
3930 {
3931 struct nlmsghdr *nlh;
3932 u8 scope = RT_SCOPE_UNIVERSE;
3933 int ifindex = ifaca->aca_idev->dev->ifindex;
3934
3935 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3936 scope = RT_SCOPE_SITE;
3937
3938 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3939 if (nlh == NULL)
3940 return -EMSGSIZE;
3941
3942 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3943 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3944 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3945 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3946 nlmsg_cancel(skb, nlh);
3947 return -EMSGSIZE;
3948 }
3949
3950 return nlmsg_end(skb, nlh);
3951 }
3952
3953 enum addr_type_t {
3954 UNICAST_ADDR,
3955 MULTICAST_ADDR,
3956 ANYCAST_ADDR,
3957 };
3958
3959 /* called with rcu_read_lock() */
3960 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3961 struct netlink_callback *cb, enum addr_type_t type,
3962 int s_ip_idx, int *p_ip_idx)
3963 {
3964 struct ifmcaddr6 *ifmca;
3965 struct ifacaddr6 *ifaca;
3966 int err = 1;
3967 int ip_idx = *p_ip_idx;
3968
3969 read_lock_bh(&idev->lock);
3970 switch (type) {
3971 case UNICAST_ADDR: {
3972 struct inet6_ifaddr *ifa;
3973
3974 /* unicast address incl. temp addr */
3975 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3976 if (++ip_idx < s_ip_idx)
3977 continue;
3978 err = inet6_fill_ifaddr(skb, ifa,
3979 NETLINK_CB(cb->skb).portid,
3980 cb->nlh->nlmsg_seq,
3981 RTM_NEWADDR,
3982 NLM_F_MULTI);
3983 if (err <= 0)
3984 break;
3985 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3986 }
3987 break;
3988 }
3989 case MULTICAST_ADDR:
3990 /* multicast address */
3991 for (ifmca = idev->mc_list; ifmca;
3992 ifmca = ifmca->next, ip_idx++) {
3993 if (ip_idx < s_ip_idx)
3994 continue;
3995 err = inet6_fill_ifmcaddr(skb, ifmca,
3996 NETLINK_CB(cb->skb).portid,
3997 cb->nlh->nlmsg_seq,
3998 RTM_GETMULTICAST,
3999 NLM_F_MULTI);
4000 if (err <= 0)
4001 break;
4002 }
4003 break;
4004 case ANYCAST_ADDR:
4005 /* anycast address */
4006 for (ifaca = idev->ac_list; ifaca;
4007 ifaca = ifaca->aca_next, ip_idx++) {
4008 if (ip_idx < s_ip_idx)
4009 continue;
4010 err = inet6_fill_ifacaddr(skb, ifaca,
4011 NETLINK_CB(cb->skb).portid,
4012 cb->nlh->nlmsg_seq,
4013 RTM_GETANYCAST,
4014 NLM_F_MULTI);
4015 if (err <= 0)
4016 break;
4017 }
4018 break;
4019 default:
4020 break;
4021 }
4022 read_unlock_bh(&idev->lock);
4023 *p_ip_idx = ip_idx;
4024 return err;
4025 }
4026
4027 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4028 enum addr_type_t type)
4029 {
4030 struct net *net = sock_net(skb->sk);
4031 int h, s_h;
4032 int idx, ip_idx;
4033 int s_idx, s_ip_idx;
4034 struct net_device *dev;
4035 struct inet6_dev *idev;
4036 struct hlist_head *head;
4037
4038 s_h = cb->args[0];
4039 s_idx = idx = cb->args[1];
4040 s_ip_idx = ip_idx = cb->args[2];
4041
4042 rcu_read_lock();
4043 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4044 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4045 idx = 0;
4046 head = &net->dev_index_head[h];
4047 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4048 if (idx < s_idx)
4049 goto cont;
4050 if (h > s_h || idx > s_idx)
4051 s_ip_idx = 0;
4052 ip_idx = 0;
4053 idev = __in6_dev_get(dev);
4054 if (!idev)
4055 goto cont;
4056
4057 if (in6_dump_addrs(idev, skb, cb, type,
4058 s_ip_idx, &ip_idx) <= 0)
4059 goto done;
4060 cont:
4061 idx++;
4062 }
4063 }
4064 done:
4065 rcu_read_unlock();
4066 cb->args[0] = h;
4067 cb->args[1] = idx;
4068 cb->args[2] = ip_idx;
4069
4070 return skb->len;
4071 }
4072
4073 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4074 {
4075 enum addr_type_t type = UNICAST_ADDR;
4076
4077 return inet6_dump_addr(skb, cb, type);
4078 }
4079
4080 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4081 {
4082 enum addr_type_t type = MULTICAST_ADDR;
4083
4084 return inet6_dump_addr(skb, cb, type);
4085 }
4086
4087
4088 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4089 {
4090 enum addr_type_t type = ANYCAST_ADDR;
4091
4092 return inet6_dump_addr(skb, cb, type);
4093 }
4094
4095 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4096 {
4097 struct net *net = sock_net(in_skb->sk);
4098 struct ifaddrmsg *ifm;
4099 struct nlattr *tb[IFA_MAX+1];
4100 struct in6_addr *addr = NULL;
4101 struct net_device *dev = NULL;
4102 struct inet6_ifaddr *ifa;
4103 struct sk_buff *skb;
4104 int err;
4105
4106 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4107 if (err < 0)
4108 goto errout;
4109
4110 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
4111 if (addr == NULL) {
4112 err = -EINVAL;
4113 goto errout;
4114 }
4115
4116 ifm = nlmsg_data(nlh);
4117 if (ifm->ifa_index)
4118 dev = __dev_get_by_index(net, ifm->ifa_index);
4119
4120 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4121 if (!ifa) {
4122 err = -EADDRNOTAVAIL;
4123 goto errout;
4124 }
4125
4126 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4127 if (!skb) {
4128 err = -ENOBUFS;
4129 goto errout_ifa;
4130 }
4131
4132 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4133 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4134 if (err < 0) {
4135 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4136 WARN_ON(err == -EMSGSIZE);
4137 kfree_skb(skb);
4138 goto errout_ifa;
4139 }
4140 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4141 errout_ifa:
4142 in6_ifa_put(ifa);
4143 errout:
4144 return err;
4145 }
4146
4147 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4148 {
4149 struct sk_buff *skb;
4150 struct net *net = dev_net(ifa->idev->dev);
4151 int err = -ENOBUFS;
4152
4153 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4154 if (skb == NULL)
4155 goto errout;
4156
4157 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4158 if (err < 0) {
4159 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4160 WARN_ON(err == -EMSGSIZE);
4161 kfree_skb(skb);
4162 goto errout;
4163 }
4164 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4165 return;
4166 errout:
4167 if (err < 0)
4168 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4169 }
4170
4171 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4172 __s32 *array, int bytes)
4173 {
4174 BUG_ON(bytes < (DEVCONF_MAX * 4));
4175
4176 memset(array, 0, bytes);
4177 array[DEVCONF_FORWARDING] = cnf->forwarding;
4178 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4179 array[DEVCONF_MTU6] = cnf->mtu6;
4180 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4181 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4182 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4183 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4184 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4185 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4186 jiffies_to_msecs(cnf->rtr_solicit_interval);
4187 array[DEVCONF_RTR_SOLICIT_DELAY] =
4188 jiffies_to_msecs(cnf->rtr_solicit_delay);
4189 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4190 #ifdef CONFIG_IPV6_PRIVACY
4191 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4192 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4193 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4194 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4195 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4196 #endif
4197 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4198 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4199 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4200 #ifdef CONFIG_IPV6_ROUTER_PREF
4201 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4202 array[DEVCONF_RTR_PROBE_INTERVAL] =
4203 jiffies_to_msecs(cnf->rtr_probe_interval);
4204 #ifdef CONFIG_IPV6_ROUTE_INFO
4205 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4206 #endif
4207 #endif
4208 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4209 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4210 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4211 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4212 #endif
4213 #ifdef CONFIG_IPV6_MROUTE
4214 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4215 #endif
4216 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4217 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4218 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4219 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4220 }
4221
4222 static inline size_t inet6_ifla6_size(void)
4223 {
4224 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4225 + nla_total_size(sizeof(struct ifla_cacheinfo))
4226 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4227 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4228 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4229 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4230 }
4231
4232 static inline size_t inet6_if_nlmsg_size(void)
4233 {
4234 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4235 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4236 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4237 + nla_total_size(4) /* IFLA_MTU */
4238 + nla_total_size(4) /* IFLA_LINK */
4239 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4240 }
4241
4242 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4243 int items, int bytes)
4244 {
4245 int i;
4246 int pad = bytes - sizeof(u64) * items;
4247 BUG_ON(pad < 0);
4248
4249 /* Use put_unaligned() because stats may not be aligned for u64. */
4250 put_unaligned(items, &stats[0]);
4251 for (i = 1; i < items; i++)
4252 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4253
4254 memset(&stats[items], 0, pad);
4255 }
4256
4257 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4258 int items, int bytes, size_t syncpoff)
4259 {
4260 int i;
4261 int pad = bytes - sizeof(u64) * items;
4262 BUG_ON(pad < 0);
4263
4264 /* Use put_unaligned() because stats may not be aligned for u64. */
4265 put_unaligned(items, &stats[0]);
4266 for (i = 1; i < items; i++)
4267 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4268
4269 memset(&stats[items], 0, pad);
4270 }
4271
4272 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4273 int bytes)
4274 {
4275 switch (attrtype) {
4276 case IFLA_INET6_STATS:
4277 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4278 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4279 break;
4280 case IFLA_INET6_ICMP6STATS:
4281 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4282 break;
4283 }
4284 }
4285
4286 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4287 {
4288 struct nlattr *nla;
4289 struct ifla_cacheinfo ci;
4290
4291 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4292 goto nla_put_failure;
4293 ci.max_reasm_len = IPV6_MAXPLEN;
4294 ci.tstamp = cstamp_delta(idev->tstamp);
4295 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4296 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4297 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4298 goto nla_put_failure;
4299 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4300 if (nla == NULL)
4301 goto nla_put_failure;
4302 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4303
4304 /* XXX - MC not implemented */
4305
4306 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4307 if (nla == NULL)
4308 goto nla_put_failure;
4309 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4310
4311 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4312 if (nla == NULL)
4313 goto nla_put_failure;
4314 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4315
4316 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4317 if (nla == NULL)
4318 goto nla_put_failure;
4319 read_lock_bh(&idev->lock);
4320 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4321 read_unlock_bh(&idev->lock);
4322
4323 return 0;
4324
4325 nla_put_failure:
4326 return -EMSGSIZE;
4327 }
4328
4329 static size_t inet6_get_link_af_size(const struct net_device *dev)
4330 {
4331 if (!__in6_dev_get(dev))
4332 return 0;
4333
4334 return inet6_ifla6_size();
4335 }
4336
4337 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4338 {
4339 struct inet6_dev *idev = __in6_dev_get(dev);
4340
4341 if (!idev)
4342 return -ENODATA;
4343
4344 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4345 return -EMSGSIZE;
4346
4347 return 0;
4348 }
4349
4350 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4351 {
4352 struct inet6_ifaddr *ifp;
4353 struct net_device *dev = idev->dev;
4354 bool update_rs = false;
4355 struct in6_addr ll_addr;
4356
4357 if (token == NULL)
4358 return -EINVAL;
4359 if (ipv6_addr_any(token))
4360 return -EINVAL;
4361 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4362 return -EINVAL;
4363 if (!ipv6_accept_ra(idev))
4364 return -EINVAL;
4365 if (idev->cnf.rtr_solicits <= 0)
4366 return -EINVAL;
4367
4368 write_lock_bh(&idev->lock);
4369
4370 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4371 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4372
4373 write_unlock_bh(&idev->lock);
4374
4375 if (!idev->dead && (idev->if_flags & IF_READY) &&
4376 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4377 IFA_F_OPTIMISTIC)) {
4378
4379 /* If we're not ready, then normal ifup will take care
4380 * of this. Otherwise, we need to request our rs here.
4381 */
4382 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4383 update_rs = true;
4384 }
4385
4386 write_lock_bh(&idev->lock);
4387
4388 if (update_rs)
4389 idev->if_flags |= IF_RS_SENT;
4390
4391 /* Well, that's kinda nasty ... */
4392 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4393 spin_lock(&ifp->lock);
4394 if (ifp->tokenized) {
4395 ifp->valid_lft = 0;
4396 ifp->prefered_lft = 0;
4397 }
4398 spin_unlock(&ifp->lock);
4399 }
4400
4401 write_unlock_bh(&idev->lock);
4402 return 0;
4403 }
4404
4405 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4406 {
4407 int err = -EINVAL;
4408 struct inet6_dev *idev = __in6_dev_get(dev);
4409 struct nlattr *tb[IFLA_INET6_MAX + 1];
4410
4411 if (!idev)
4412 return -EAFNOSUPPORT;
4413
4414 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4415 BUG();
4416
4417 if (tb[IFLA_INET6_TOKEN])
4418 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4419
4420 return err;
4421 }
4422
4423 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4424 u32 portid, u32 seq, int event, unsigned int flags)
4425 {
4426 struct net_device *dev = idev->dev;
4427 struct ifinfomsg *hdr;
4428 struct nlmsghdr *nlh;
4429 void *protoinfo;
4430
4431 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4432 if (nlh == NULL)
4433 return -EMSGSIZE;
4434
4435 hdr = nlmsg_data(nlh);
4436 hdr->ifi_family = AF_INET6;
4437 hdr->__ifi_pad = 0;
4438 hdr->ifi_type = dev->type;
4439 hdr->ifi_index = dev->ifindex;
4440 hdr->ifi_flags = dev_get_flags(dev);
4441 hdr->ifi_change = 0;
4442
4443 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4444 (dev->addr_len &&
4445 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4446 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4447 (dev->ifindex != dev->iflink &&
4448 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4449 goto nla_put_failure;
4450 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4451 if (protoinfo == NULL)
4452 goto nla_put_failure;
4453
4454 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4455 goto nla_put_failure;
4456
4457 nla_nest_end(skb, protoinfo);
4458 return nlmsg_end(skb, nlh);
4459
4460 nla_put_failure:
4461 nlmsg_cancel(skb, nlh);
4462 return -EMSGSIZE;
4463 }
4464
4465 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4466 {
4467 struct net *net = sock_net(skb->sk);
4468 int h, s_h;
4469 int idx = 0, s_idx;
4470 struct net_device *dev;
4471 struct inet6_dev *idev;
4472 struct hlist_head *head;
4473
4474 s_h = cb->args[0];
4475 s_idx = cb->args[1];
4476
4477 rcu_read_lock();
4478 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4479 idx = 0;
4480 head = &net->dev_index_head[h];
4481 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4482 if (idx < s_idx)
4483 goto cont;
4484 idev = __in6_dev_get(dev);
4485 if (!idev)
4486 goto cont;
4487 if (inet6_fill_ifinfo(skb, idev,
4488 NETLINK_CB(cb->skb).portid,
4489 cb->nlh->nlmsg_seq,
4490 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4491 goto out;
4492 cont:
4493 idx++;
4494 }
4495 }
4496 out:
4497 rcu_read_unlock();
4498 cb->args[1] = idx;
4499 cb->args[0] = h;
4500
4501 return skb->len;
4502 }
4503
4504 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4505 {
4506 struct sk_buff *skb;
4507 struct net *net = dev_net(idev->dev);
4508 int err = -ENOBUFS;
4509
4510 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4511 if (skb == NULL)
4512 goto errout;
4513
4514 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4515 if (err < 0) {
4516 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4517 WARN_ON(err == -EMSGSIZE);
4518 kfree_skb(skb);
4519 goto errout;
4520 }
4521 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4522 return;
4523 errout:
4524 if (err < 0)
4525 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4526 }
4527
4528 static inline size_t inet6_prefix_nlmsg_size(void)
4529 {
4530 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4531 + nla_total_size(sizeof(struct in6_addr))
4532 + nla_total_size(sizeof(struct prefix_cacheinfo));
4533 }
4534
4535 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4536 struct prefix_info *pinfo, u32 portid, u32 seq,
4537 int event, unsigned int flags)
4538 {
4539 struct prefixmsg *pmsg;
4540 struct nlmsghdr *nlh;
4541 struct prefix_cacheinfo ci;
4542
4543 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4544 if (nlh == NULL)
4545 return -EMSGSIZE;
4546
4547 pmsg = nlmsg_data(nlh);
4548 pmsg->prefix_family = AF_INET6;
4549 pmsg->prefix_pad1 = 0;
4550 pmsg->prefix_pad2 = 0;
4551 pmsg->prefix_ifindex = idev->dev->ifindex;
4552 pmsg->prefix_len = pinfo->prefix_len;
4553 pmsg->prefix_type = pinfo->type;
4554 pmsg->prefix_pad3 = 0;
4555 pmsg->prefix_flags = 0;
4556 if (pinfo->onlink)
4557 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4558 if (pinfo->autoconf)
4559 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4560
4561 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4562 goto nla_put_failure;
4563 ci.preferred_time = ntohl(pinfo->prefered);
4564 ci.valid_time = ntohl(pinfo->valid);
4565 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4566 goto nla_put_failure;
4567 return nlmsg_end(skb, nlh);
4568
4569 nla_put_failure:
4570 nlmsg_cancel(skb, nlh);
4571 return -EMSGSIZE;
4572 }
4573
4574 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4575 struct prefix_info *pinfo)
4576 {
4577 struct sk_buff *skb;
4578 struct net *net = dev_net(idev->dev);
4579 int err = -ENOBUFS;
4580
4581 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4582 if (skb == NULL)
4583 goto errout;
4584
4585 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4586 if (err < 0) {
4587 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4588 WARN_ON(err == -EMSGSIZE);
4589 kfree_skb(skb);
4590 goto errout;
4591 }
4592 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4593 return;
4594 errout:
4595 if (err < 0)
4596 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4597 }
4598
4599 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4600 {
4601 struct net *net = dev_net(ifp->idev->dev);
4602
4603 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4604
4605 switch (event) {
4606 case RTM_NEWADDR:
4607 /*
4608 * If the address was optimistic
4609 * we inserted the route at the start of
4610 * our DAD process, so we don't need
4611 * to do it again
4612 */
4613 if (!(ifp->rt->rt6i_node))
4614 ip6_ins_rt(ifp->rt);
4615 if (ifp->idev->cnf.forwarding)
4616 addrconf_join_anycast(ifp);
4617 break;
4618 case RTM_DELADDR:
4619 if (ifp->idev->cnf.forwarding)
4620 addrconf_leave_anycast(ifp);
4621 addrconf_leave_solict(ifp->idev, &ifp->addr);
4622 dst_hold(&ifp->rt->dst);
4623
4624 if (ip6_del_rt(ifp->rt))
4625 dst_free(&ifp->rt->dst);
4626 break;
4627 }
4628 atomic_inc(&net->ipv6.dev_addr_genid);
4629 }
4630
4631 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4632 {
4633 rcu_read_lock_bh();
4634 if (likely(ifp->idev->dead == 0))
4635 __ipv6_ifa_notify(event, ifp);
4636 rcu_read_unlock_bh();
4637 }
4638
4639 #ifdef CONFIG_SYSCTL
4640
4641 static
4642 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4643 void __user *buffer, size_t *lenp, loff_t *ppos)
4644 {
4645 int *valp = ctl->data;
4646 int val = *valp;
4647 loff_t pos = *ppos;
4648 ctl_table lctl;
4649 int ret;
4650
4651 /*
4652 * ctl->data points to idev->cnf.forwarding, we should
4653 * not modify it until we get the rtnl lock.
4654 */
4655 lctl = *ctl;
4656 lctl.data = &val;
4657
4658 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4659
4660 if (write)
4661 ret = addrconf_fixup_forwarding(ctl, valp, val);
4662 if (ret)
4663 *ppos = pos;
4664 return ret;
4665 }
4666
4667 static void dev_disable_change(struct inet6_dev *idev)
4668 {
4669 if (!idev || !idev->dev)
4670 return;
4671
4672 if (idev->cnf.disable_ipv6)
4673 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4674 else
4675 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4676 }
4677
4678 static void addrconf_disable_change(struct net *net, __s32 newf)
4679 {
4680 struct net_device *dev;
4681 struct inet6_dev *idev;
4682
4683 rcu_read_lock();
4684 for_each_netdev_rcu(net, dev) {
4685 idev = __in6_dev_get(dev);
4686 if (idev) {
4687 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4688 idev->cnf.disable_ipv6 = newf;
4689 if (changed)
4690 dev_disable_change(idev);
4691 }
4692 }
4693 rcu_read_unlock();
4694 }
4695
4696 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4697 {
4698 struct net *net;
4699 int old;
4700
4701 if (!rtnl_trylock())
4702 return restart_syscall();
4703
4704 net = (struct net *)table->extra2;
4705 old = *p;
4706 *p = newf;
4707
4708 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4709 rtnl_unlock();
4710 return 0;
4711 }
4712
4713 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4714 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4715 addrconf_disable_change(net, newf);
4716 } else if ((!newf) ^ (!old))
4717 dev_disable_change((struct inet6_dev *)table->extra1);
4718
4719 rtnl_unlock();
4720 return 0;
4721 }
4722
4723 static
4724 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4725 void __user *buffer, size_t *lenp, loff_t *ppos)
4726 {
4727 int *valp = ctl->data;
4728 int val = *valp;
4729 loff_t pos = *ppos;
4730 ctl_table lctl;
4731 int ret;
4732
4733 /*
4734 * ctl->data points to idev->cnf.disable_ipv6, we should
4735 * not modify it until we get the rtnl lock.
4736 */
4737 lctl = *ctl;
4738 lctl.data = &val;
4739
4740 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4741
4742 if (write)
4743 ret = addrconf_disable_ipv6(ctl, valp, val);
4744 if (ret)
4745 *ppos = pos;
4746 return ret;
4747 }
4748
4749 static struct addrconf_sysctl_table
4750 {
4751 struct ctl_table_header *sysctl_header;
4752 ctl_table addrconf_vars[DEVCONF_MAX+1];
4753 } addrconf_sysctl __read_mostly = {
4754 .sysctl_header = NULL,
4755 .addrconf_vars = {
4756 {
4757 .procname = "forwarding",
4758 .data = &ipv6_devconf.forwarding,
4759 .maxlen = sizeof(int),
4760 .mode = 0644,
4761 .proc_handler = addrconf_sysctl_forward,
4762 },
4763 {
4764 .procname = "hop_limit",
4765 .data = &ipv6_devconf.hop_limit,
4766 .maxlen = sizeof(int),
4767 .mode = 0644,
4768 .proc_handler = proc_dointvec,
4769 },
4770 {
4771 .procname = "mtu",
4772 .data = &ipv6_devconf.mtu6,
4773 .maxlen = sizeof(int),
4774 .mode = 0644,
4775 .proc_handler = proc_dointvec,
4776 },
4777 {
4778 .procname = "accept_ra",
4779 .data = &ipv6_devconf.accept_ra,
4780 .maxlen = sizeof(int),
4781 .mode = 0644,
4782 .proc_handler = proc_dointvec,
4783 },
4784 {
4785 .procname = "accept_redirects",
4786 .data = &ipv6_devconf.accept_redirects,
4787 .maxlen = sizeof(int),
4788 .mode = 0644,
4789 .proc_handler = proc_dointvec,
4790 },
4791 {
4792 .procname = "autoconf",
4793 .data = &ipv6_devconf.autoconf,
4794 .maxlen = sizeof(int),
4795 .mode = 0644,
4796 .proc_handler = proc_dointvec,
4797 },
4798 {
4799 .procname = "dad_transmits",
4800 .data = &ipv6_devconf.dad_transmits,
4801 .maxlen = sizeof(int),
4802 .mode = 0644,
4803 .proc_handler = proc_dointvec,
4804 },
4805 {
4806 .procname = "router_solicitations",
4807 .data = &ipv6_devconf.rtr_solicits,
4808 .maxlen = sizeof(int),
4809 .mode = 0644,
4810 .proc_handler = proc_dointvec,
4811 },
4812 {
4813 .procname = "router_solicitation_interval",
4814 .data = &ipv6_devconf.rtr_solicit_interval,
4815 .maxlen = sizeof(int),
4816 .mode = 0644,
4817 .proc_handler = proc_dointvec_jiffies,
4818 },
4819 {
4820 .procname = "router_solicitation_delay",
4821 .data = &ipv6_devconf.rtr_solicit_delay,
4822 .maxlen = sizeof(int),
4823 .mode = 0644,
4824 .proc_handler = proc_dointvec_jiffies,
4825 },
4826 {
4827 .procname = "force_mld_version",
4828 .data = &ipv6_devconf.force_mld_version,
4829 .maxlen = sizeof(int),
4830 .mode = 0644,
4831 .proc_handler = proc_dointvec,
4832 },
4833 #ifdef CONFIG_IPV6_PRIVACY
4834 {
4835 .procname = "use_tempaddr",
4836 .data = &ipv6_devconf.use_tempaddr,
4837 .maxlen = sizeof(int),
4838 .mode = 0644,
4839 .proc_handler = proc_dointvec,
4840 },
4841 {
4842 .procname = "temp_valid_lft",
4843 .data = &ipv6_devconf.temp_valid_lft,
4844 .maxlen = sizeof(int),
4845 .mode = 0644,
4846 .proc_handler = proc_dointvec,
4847 },
4848 {
4849 .procname = "temp_prefered_lft",
4850 .data = &ipv6_devconf.temp_prefered_lft,
4851 .maxlen = sizeof(int),
4852 .mode = 0644,
4853 .proc_handler = proc_dointvec,
4854 },
4855 {
4856 .procname = "regen_max_retry",
4857 .data = &ipv6_devconf.regen_max_retry,
4858 .maxlen = sizeof(int),
4859 .mode = 0644,
4860 .proc_handler = proc_dointvec,
4861 },
4862 {
4863 .procname = "max_desync_factor",
4864 .data = &ipv6_devconf.max_desync_factor,
4865 .maxlen = sizeof(int),
4866 .mode = 0644,
4867 .proc_handler = proc_dointvec,
4868 },
4869 #endif
4870 {
4871 .procname = "max_addresses",
4872 .data = &ipv6_devconf.max_addresses,
4873 .maxlen = sizeof(int),
4874 .mode = 0644,
4875 .proc_handler = proc_dointvec,
4876 },
4877 {
4878 .procname = "accept_ra_defrtr",
4879 .data = &ipv6_devconf.accept_ra_defrtr,
4880 .maxlen = sizeof(int),
4881 .mode = 0644,
4882 .proc_handler = proc_dointvec,
4883 },
4884 {
4885 .procname = "accept_ra_pinfo",
4886 .data = &ipv6_devconf.accept_ra_pinfo,
4887 .maxlen = sizeof(int),
4888 .mode = 0644,
4889 .proc_handler = proc_dointvec,
4890 },
4891 #ifdef CONFIG_IPV6_ROUTER_PREF
4892 {
4893 .procname = "accept_ra_rtr_pref",
4894 .data = &ipv6_devconf.accept_ra_rtr_pref,
4895 .maxlen = sizeof(int),
4896 .mode = 0644,
4897 .proc_handler = proc_dointvec,
4898 },
4899 {
4900 .procname = "router_probe_interval",
4901 .data = &ipv6_devconf.rtr_probe_interval,
4902 .maxlen = sizeof(int),
4903 .mode = 0644,
4904 .proc_handler = proc_dointvec_jiffies,
4905 },
4906 #ifdef CONFIG_IPV6_ROUTE_INFO
4907 {
4908 .procname = "accept_ra_rt_info_max_plen",
4909 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4910 .maxlen = sizeof(int),
4911 .mode = 0644,
4912 .proc_handler = proc_dointvec,
4913 },
4914 #endif
4915 #endif
4916 {
4917 .procname = "proxy_ndp",
4918 .data = &ipv6_devconf.proxy_ndp,
4919 .maxlen = sizeof(int),
4920 .mode = 0644,
4921 .proc_handler = proc_dointvec,
4922 },
4923 {
4924 .procname = "accept_source_route",
4925 .data = &ipv6_devconf.accept_source_route,
4926 .maxlen = sizeof(int),
4927 .mode = 0644,
4928 .proc_handler = proc_dointvec,
4929 },
4930 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4931 {
4932 .procname = "optimistic_dad",
4933 .data = &ipv6_devconf.optimistic_dad,
4934 .maxlen = sizeof(int),
4935 .mode = 0644,
4936 .proc_handler = proc_dointvec,
4937
4938 },
4939 #endif
4940 #ifdef CONFIG_IPV6_MROUTE
4941 {
4942 .procname = "mc_forwarding",
4943 .data = &ipv6_devconf.mc_forwarding,
4944 .maxlen = sizeof(int),
4945 .mode = 0444,
4946 .proc_handler = proc_dointvec,
4947 },
4948 #endif
4949 {
4950 .procname = "disable_ipv6",
4951 .data = &ipv6_devconf.disable_ipv6,
4952 .maxlen = sizeof(int),
4953 .mode = 0644,
4954 .proc_handler = addrconf_sysctl_disable,
4955 },
4956 {
4957 .procname = "accept_dad",
4958 .data = &ipv6_devconf.accept_dad,
4959 .maxlen = sizeof(int),
4960 .mode = 0644,
4961 .proc_handler = proc_dointvec,
4962 },
4963 {
4964 .procname = "force_tllao",
4965 .data = &ipv6_devconf.force_tllao,
4966 .maxlen = sizeof(int),
4967 .mode = 0644,
4968 .proc_handler = proc_dointvec
4969 },
4970 {
4971 .procname = "ndisc_notify",
4972 .data = &ipv6_devconf.ndisc_notify,
4973 .maxlen = sizeof(int),
4974 .mode = 0644,
4975 .proc_handler = proc_dointvec
4976 },
4977 {
4978 /* sentinel */
4979 }
4980 },
4981 };
4982
4983 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4984 struct inet6_dev *idev, struct ipv6_devconf *p)
4985 {
4986 int i;
4987 struct addrconf_sysctl_table *t;
4988 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4989
4990 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4991 if (t == NULL)
4992 goto out;
4993
4994 for (i = 0; t->addrconf_vars[i].data; i++) {
4995 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4996 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4997 t->addrconf_vars[i].extra2 = net;
4998 }
4999
5000 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5001
5002 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5003 if (t->sysctl_header == NULL)
5004 goto free;
5005
5006 p->sysctl = t;
5007 return 0;
5008
5009 free:
5010 kfree(t);
5011 out:
5012 return -ENOBUFS;
5013 }
5014
5015 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5016 {
5017 struct addrconf_sysctl_table *t;
5018
5019 if (p->sysctl == NULL)
5020 return;
5021
5022 t = p->sysctl;
5023 p->sysctl = NULL;
5024 unregister_net_sysctl_table(t->sysctl_header);
5025 kfree(t);
5026 }
5027
5028 static void addrconf_sysctl_register(struct inet6_dev *idev)
5029 {
5030 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
5031 &ndisc_ifinfo_sysctl_change);
5032 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5033 idev, &idev->cnf);
5034 }
5035
5036 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5037 {
5038 __addrconf_sysctl_unregister(&idev->cnf);
5039 neigh_sysctl_unregister(idev->nd_parms);
5040 }
5041
5042
5043 #endif
5044
5045 static int __net_init addrconf_init_net(struct net *net)
5046 {
5047 int err = -ENOMEM;
5048 struct ipv6_devconf *all, *dflt;
5049
5050 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5051 if (all == NULL)
5052 goto err_alloc_all;
5053
5054 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5055 if (dflt == NULL)
5056 goto err_alloc_dflt;
5057
5058 /* these will be inherited by all namespaces */
5059 dflt->autoconf = ipv6_defaults.autoconf;
5060 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5061
5062 net->ipv6.devconf_all = all;
5063 net->ipv6.devconf_dflt = dflt;
5064
5065 #ifdef CONFIG_SYSCTL
5066 err = __addrconf_sysctl_register(net, "all", NULL, all);
5067 if (err < 0)
5068 goto err_reg_all;
5069
5070 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5071 if (err < 0)
5072 goto err_reg_dflt;
5073 #endif
5074 return 0;
5075
5076 #ifdef CONFIG_SYSCTL
5077 err_reg_dflt:
5078 __addrconf_sysctl_unregister(all);
5079 err_reg_all:
5080 kfree(dflt);
5081 #endif
5082 err_alloc_dflt:
5083 kfree(all);
5084 err_alloc_all:
5085 return err;
5086 }
5087
5088 static void __net_exit addrconf_exit_net(struct net *net)
5089 {
5090 #ifdef CONFIG_SYSCTL
5091 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5092 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5093 #endif
5094 if (!net_eq(net, &init_net)) {
5095 kfree(net->ipv6.devconf_dflt);
5096 kfree(net->ipv6.devconf_all);
5097 }
5098 }
5099
5100 static struct pernet_operations addrconf_ops = {
5101 .init = addrconf_init_net,
5102 .exit = addrconf_exit_net,
5103 };
5104
5105 static struct rtnl_af_ops inet6_ops = {
5106 .family = AF_INET6,
5107 .fill_link_af = inet6_fill_link_af,
5108 .get_link_af_size = inet6_get_link_af_size,
5109 .set_link_af = inet6_set_link_af,
5110 };
5111
5112 /*
5113 * Init / cleanup code
5114 */
5115
5116 int __init addrconf_init(void)
5117 {
5118 int i, err;
5119
5120 err = ipv6_addr_label_init();
5121 if (err < 0) {
5122 pr_crit("%s: cannot initialize default policy table: %d\n",
5123 __func__, err);
5124 goto out;
5125 }
5126
5127 err = register_pernet_subsys(&addrconf_ops);
5128 if (err < 0)
5129 goto out_addrlabel;
5130
5131 /* The addrconf netdev notifier requires that loopback_dev
5132 * has it's ipv6 private information allocated and setup
5133 * before it can bring up and give link-local addresses
5134 * to other devices which are up.
5135 *
5136 * Unfortunately, loopback_dev is not necessarily the first
5137 * entry in the global dev_base list of net devices. In fact,
5138 * it is likely to be the very last entry on that list.
5139 * So this causes the notifier registry below to try and
5140 * give link-local addresses to all devices besides loopback_dev
5141 * first, then loopback_dev, which cases all the non-loopback_dev
5142 * devices to fail to get a link-local address.
5143 *
5144 * So, as a temporary fix, allocate the ipv6 structure for
5145 * loopback_dev first by hand.
5146 * Longer term, all of the dependencies ipv6 has upon the loopback
5147 * device and it being up should be removed.
5148 */
5149 rtnl_lock();
5150 if (!ipv6_add_dev(init_net.loopback_dev))
5151 err = -ENOMEM;
5152 rtnl_unlock();
5153 if (err)
5154 goto errlo;
5155
5156 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5157 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5158
5159 register_netdevice_notifier(&ipv6_dev_notf);
5160
5161 addrconf_verify(0);
5162
5163 err = rtnl_af_register(&inet6_ops);
5164 if (err < 0)
5165 goto errout_af;
5166
5167 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5168 NULL);
5169 if (err < 0)
5170 goto errout;
5171
5172 /* Only the first call to __rtnl_register can fail */
5173 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5174 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5175 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5176 inet6_dump_ifaddr, NULL);
5177 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5178 inet6_dump_ifmcaddr, NULL);
5179 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5180 inet6_dump_ifacaddr, NULL);
5181 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5182 inet6_netconf_dump_devconf, NULL);
5183
5184 ipv6_addr_label_rtnl_register();
5185
5186 return 0;
5187 errout:
5188 rtnl_af_unregister(&inet6_ops);
5189 errout_af:
5190 unregister_netdevice_notifier(&ipv6_dev_notf);
5191 errlo:
5192 unregister_pernet_subsys(&addrconf_ops);
5193 out_addrlabel:
5194 ipv6_addr_label_cleanup();
5195 out:
5196 return err;
5197 }
5198
5199 void addrconf_cleanup(void)
5200 {
5201 struct net_device *dev;
5202 int i;
5203
5204 unregister_netdevice_notifier(&ipv6_dev_notf);
5205 unregister_pernet_subsys(&addrconf_ops);
5206 ipv6_addr_label_cleanup();
5207
5208 rtnl_lock();
5209
5210 __rtnl_af_unregister(&inet6_ops);
5211
5212 /* clean dev list */
5213 for_each_netdev(&init_net, dev) {
5214 if (__in6_dev_get(dev) == NULL)
5215 continue;
5216 addrconf_ifdown(dev, 1);
5217 }
5218 addrconf_ifdown(init_net.loopback_dev, 2);
5219
5220 /*
5221 * Check hash table.
5222 */
5223 spin_lock_bh(&addrconf_hash_lock);
5224 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5225 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5226 spin_unlock_bh(&addrconf_hash_lock);
5227
5228 del_timer(&addr_chk_timer);
5229 rtnl_unlock();
5230 }
kernel source for telekom puls (alcatel/mediatek)