]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - net/ipv6/addrconf.c
projects / mirror_ubuntu-bionic-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
[IPV6]: Make address arguments const.
[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17 /*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
41 */
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/socket.h>
46 #include <linux/sockios.h>
47 #include <linux/net.h>
48 #include <linux/in6.h>
49 #include <linux/netdevice.h>
50 #include <linux/if_addr.h>
51 #include <linux/if_arp.h>
52 #include <linux/if_arcnet.h>
53 #include <linux/if_infiniband.h>
54 #include <linux/route.h>
55 #include <linux/inetdevice.h>
56 #include <linux/init.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64
65 #include <net/net_namespace.h>
66 #include <net/sock.h>
67 #include <net/snmp.h>
68
69 #include <net/ipv6.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
74 #include <net/tcp.h>
75 #include <net/ip.h>
76 #include <net/netlink.h>
77 #include <net/pkt_sched.h>
78 #include <linux/if_tunnel.h>
79 #include <linux/rtnetlink.h>
80
81 #ifdef CONFIG_IPV6_PRIVACY
82 #include <linux/random.h>
83 #endif
84
85 #include <asm/uaccess.h>
86 #include <asm/unaligned.h>
87
88 #include <linux/proc_fs.h>
89 #include <linux/seq_file.h>
90
91 /* Set to 3 to get tracing... */
92 #define ACONF_DEBUG 2
93
94 #if ACONF_DEBUG >= 3
95 #define ADBG(x) printk x
96 #else
97 #define ADBG(x)
98 #endif
99
100 #define INFINITY_LIFE_TIME 0xFFFFFFFF
101 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102
103 #ifdef CONFIG_SYSCTL
104 static void addrconf_sysctl_register(struct inet6_dev *idev);
105 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
106 #else
107 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
108 {
109 }
110
111 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
112 {
113 }
114 #endif
115
116 #ifdef CONFIG_IPV6_PRIVACY
117 static int __ipv6_regen_rndid(struct inet6_dev *idev);
118 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
119 static void ipv6_regen_rndid(unsigned long data);
120
121 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
122 #endif
123
124 static int ipv6_count_addresses(struct inet6_dev *idev);
125
126 /*
127 * Configured unicast address hash table
128 */
129 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
130 static DEFINE_RWLOCK(addrconf_hash_lock);
131
132 static void addrconf_verify(unsigned long);
133
134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
135 static DEFINE_SPINLOCK(addrconf_verify_lock);
136
137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139
140 static int addrconf_ifdown(struct net_device *dev, int how);
141
142 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
143 static void addrconf_dad_timer(unsigned long data);
144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
145 static void addrconf_dad_run(struct inet6_dev *idev);
146 static void addrconf_rs_timer(unsigned long data);
147 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
149
150 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
151 struct prefix_info *pinfo);
152 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
153 struct net_device *dev);
154
155 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
156
157 struct ipv6_devconf ipv6_devconf __read_mostly = {
158 .forwarding = 0,
159 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
160 .mtu6 = IPV6_MIN_MTU,
161 .accept_ra = 1,
162 .accept_redirects = 1,
163 .autoconf = 1,
164 .force_mld_version = 0,
165 .dad_transmits = 1,
166 .rtr_solicits = MAX_RTR_SOLICITATIONS,
167 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
168 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
169 #ifdef CONFIG_IPV6_PRIVACY
170 .use_tempaddr = 0,
171 .temp_valid_lft = TEMP_VALID_LIFETIME,
172 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
173 .regen_max_retry = REGEN_MAX_RETRY,
174 .max_desync_factor = MAX_DESYNC_FACTOR,
175 #endif
176 .max_addresses = IPV6_MAX_ADDRESSES,
177 .accept_ra_defrtr = 1,
178 .accept_ra_pinfo = 1,
179 #ifdef CONFIG_IPV6_ROUTER_PREF
180 .accept_ra_rtr_pref = 1,
181 .rtr_probe_interval = 60 * HZ,
182 #ifdef CONFIG_IPV6_ROUTE_INFO
183 .accept_ra_rt_info_max_plen = 0,
184 #endif
185 #endif
186 .proxy_ndp = 0,
187 .accept_source_route = 0, /* we do not accept RH0 by default. */
188 };
189
190 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
191 .forwarding = 0,
192 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
193 .mtu6 = IPV6_MIN_MTU,
194 .accept_ra = 1,
195 .accept_redirects = 1,
196 .autoconf = 1,
197 .dad_transmits = 1,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
201 #ifdef CONFIG_IPV6_PRIVACY
202 .use_tempaddr = 0,
203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
207 #endif
208 .max_addresses = IPV6_MAX_ADDRESSES,
209 .accept_ra_defrtr = 1,
210 .accept_ra_pinfo = 1,
211 #ifdef CONFIG_IPV6_ROUTER_PREF
212 .accept_ra_rtr_pref = 1,
213 .rtr_probe_interval = 60 * HZ,
214 #ifdef CONFIG_IPV6_ROUTE_INFO
215 .accept_ra_rt_info_max_plen = 0,
216 #endif
217 #endif
218 .proxy_ndp = 0,
219 .accept_source_route = 0, /* we do not accept RH0 by default. */
220 };
221
222 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
223 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
224 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
225
226 /* Check if a valid qdisc is available */
227 static inline int addrconf_qdisc_ok(struct net_device *dev)
228 {
229 return (dev->qdisc != &noop_qdisc);
230 }
231
232 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
233 {
234 if (del_timer(&ifp->timer))
235 __in6_ifa_put(ifp);
236 }
237
238 enum addrconf_timer_t
239 {
240 AC_NONE,
241 AC_DAD,
242 AC_RS,
243 };
244
245 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
246 enum addrconf_timer_t what,
247 unsigned long when)
248 {
249 if (!del_timer(&ifp->timer))
250 in6_ifa_hold(ifp);
251
252 switch (what) {
253 case AC_DAD:
254 ifp->timer.function = addrconf_dad_timer;
255 break;
256 case AC_RS:
257 ifp->timer.function = addrconf_rs_timer;
258 break;
259 default:;
260 }
261 ifp->timer.expires = jiffies + when;
262 add_timer(&ifp->timer);
263 }
264
265 static int snmp6_alloc_dev(struct inet6_dev *idev)
266 {
267 if (snmp_mib_init((void **)idev->stats.ipv6,
268 sizeof(struct ipstats_mib)) < 0)
269 goto err_ip;
270 if (snmp_mib_init((void **)idev->stats.icmpv6,
271 sizeof(struct icmpv6_mib)) < 0)
272 goto err_icmp;
273 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
274 sizeof(struct icmpv6msg_mib)) < 0)
275 goto err_icmpmsg;
276
277 return 0;
278
279 err_icmpmsg:
280 snmp_mib_free((void **)idev->stats.icmpv6);
281 err_icmp:
282 snmp_mib_free((void **)idev->stats.ipv6);
283 err_ip:
284 return -ENOMEM;
285 }
286
287 static void snmp6_free_dev(struct inet6_dev *idev)
288 {
289 snmp_mib_free((void **)idev->stats.icmpv6msg);
290 snmp_mib_free((void **)idev->stats.icmpv6);
291 snmp_mib_free((void **)idev->stats.ipv6);
292 }
293
294 /* Nobody refers to this device, we may destroy it. */
295
296 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
297 {
298 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
299 kfree(idev);
300 }
301
302 void in6_dev_finish_destroy(struct inet6_dev *idev)
303 {
304 struct net_device *dev = idev->dev;
305 BUG_TRAP(idev->addr_list==NULL);
306 BUG_TRAP(idev->mc_list==NULL);
307 #ifdef NET_REFCNT_DEBUG
308 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
309 #endif
310 dev_put(dev);
311 if (!idev->dead) {
312 printk("Freeing alive inet6 device %p\n", idev);
313 return;
314 }
315 snmp6_free_dev(idev);
316 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
317 }
318
319 EXPORT_SYMBOL(in6_dev_finish_destroy);
320
321 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
322 {
323 struct inet6_dev *ndev;
324 struct in6_addr maddr;
325
326 ASSERT_RTNL();
327
328 if (dev->mtu < IPV6_MIN_MTU)
329 return NULL;
330
331 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
332
333 if (ndev == NULL)
334 return NULL;
335
336 rwlock_init(&ndev->lock);
337 ndev->dev = dev;
338 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
339 ndev->cnf.mtu6 = dev->mtu;
340 ndev->cnf.sysctl = NULL;
341 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
342 if (ndev->nd_parms == NULL) {
343 kfree(ndev);
344 return NULL;
345 }
346 /* We refer to the device */
347 dev_hold(dev);
348
349 if (snmp6_alloc_dev(ndev) < 0) {
350 ADBG((KERN_WARNING
351 "%s(): cannot allocate memory for statistics; dev=%s.\n",
352 __func__, dev->name));
353 neigh_parms_release(&nd_tbl, ndev->nd_parms);
354 ndev->dead = 1;
355 in6_dev_finish_destroy(ndev);
356 return NULL;
357 }
358
359 if (snmp6_register_dev(ndev) < 0) {
360 ADBG((KERN_WARNING
361 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
362 __func__, dev->name));
363 neigh_parms_release(&nd_tbl, ndev->nd_parms);
364 ndev->dead = 1;
365 in6_dev_finish_destroy(ndev);
366 return NULL;
367 }
368
369 /* One reference from device. We must do this before
370 * we invoke __ipv6_regen_rndid().
371 */
372 in6_dev_hold(ndev);
373
374 #ifdef CONFIG_IPV6_PRIVACY
375 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
376 if ((dev->flags&IFF_LOOPBACK) ||
377 dev->type == ARPHRD_TUNNEL ||
378 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
379 dev->type == ARPHRD_SIT ||
380 #endif
381 dev->type == ARPHRD_NONE) {
382 printk(KERN_INFO
383 "%s: Disabled Privacy Extensions\n",
384 dev->name);
385 ndev->cnf.use_tempaddr = -1;
386
387 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
388 printk(KERN_INFO
389 "%s: Disabled Multicast RS\n",
390 dev->name);
391 ndev->cnf.rtr_solicits = 0;
392 }
393 } else {
394 in6_dev_hold(ndev);
395 ipv6_regen_rndid((unsigned long) ndev);
396 }
397 #endif
398
399 if (netif_running(dev) && addrconf_qdisc_ok(dev))
400 ndev->if_flags |= IF_READY;
401
402 ipv6_mc_init_dev(ndev);
403 ndev->tstamp = jiffies;
404 addrconf_sysctl_register(ndev);
405 /* protected by rtnl_lock */
406 rcu_assign_pointer(dev->ip6_ptr, ndev);
407
408 /* Join all-node multicast group */
409 ipv6_addr_all_nodes(&maddr);
410 ipv6_dev_mc_inc(dev, &maddr);
411
412 return ndev;
413 }
414
415 struct inet6_dev * ipv6_find_idev(struct net_device *dev)
416 {
417 struct inet6_dev *idev;
418
419 ASSERT_RTNL();
420
421 if ((idev = __in6_dev_get(dev)) == NULL) {
422 if ((idev = ipv6_add_dev(dev)) == NULL)
423 return NULL;
424 }
425
426 if (dev->flags&IFF_UP)
427 ipv6_mc_up(idev);
428 return idev;
429 }
430
431 #ifdef CONFIG_SYSCTL
432 static void dev_forward_change(struct inet6_dev *idev)
433 {
434 struct net_device *dev;
435 struct inet6_ifaddr *ifa;
436 struct in6_addr addr;
437
438 if (!idev)
439 return;
440 dev = idev->dev;
441 if (dev && (dev->flags & IFF_MULTICAST)) {
442 ipv6_addr_all_routers(&addr);
443
444 if (idev->cnf.forwarding)
445 ipv6_dev_mc_inc(dev, &addr);
446 else
447 ipv6_dev_mc_dec(dev, &addr);
448 }
449 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
450 if (ifa->flags&IFA_F_TENTATIVE)
451 continue;
452 if (idev->cnf.forwarding)
453 addrconf_join_anycast(ifa);
454 else
455 addrconf_leave_anycast(ifa);
456 }
457 }
458
459
460 static void addrconf_forward_change(struct net *net, __s32 newf)
461 {
462 struct net_device *dev;
463 struct inet6_dev *idev;
464
465 read_lock(&dev_base_lock);
466 for_each_netdev(net, dev) {
467 rcu_read_lock();
468 idev = __in6_dev_get(dev);
469 if (idev) {
470 int changed = (!idev->cnf.forwarding) ^ (!newf);
471 idev->cnf.forwarding = newf;
472 if (changed)
473 dev_forward_change(idev);
474 }
475 rcu_read_unlock();
476 }
477 read_unlock(&dev_base_lock);
478 }
479
480 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
481 {
482 struct net *net;
483
484 net = (struct net *)table->extra2;
485 if (p == &net->ipv6.devconf_dflt->forwarding)
486 return;
487
488 if (p == &net->ipv6.devconf_all->forwarding) {
489 __s32 newf = net->ipv6.devconf_all->forwarding;
490 net->ipv6.devconf_dflt->forwarding = newf;
491 addrconf_forward_change(net, newf);
492 } else if ((!*p) ^ (!old))
493 dev_forward_change((struct inet6_dev *)table->extra1);
494
495 if (*p)
496 rt6_purge_dflt_routers(net);
497 }
498 #endif
499
500 /* Nobody refers to this ifaddr, destroy it */
501
502 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
503 {
504 BUG_TRAP(ifp->if_next==NULL);
505 BUG_TRAP(ifp->lst_next==NULL);
506 #ifdef NET_REFCNT_DEBUG
507 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
508 #endif
509
510 in6_dev_put(ifp->idev);
511
512 if (del_timer(&ifp->timer))
513 printk("Timer is still running, when freeing ifa=%p\n", ifp);
514
515 if (!ifp->dead) {
516 printk("Freeing alive inet6 address %p\n", ifp);
517 return;
518 }
519 dst_release(&ifp->rt->u.dst);
520
521 kfree(ifp);
522 }
523
524 static void
525 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
526 {
527 struct inet6_ifaddr *ifa, **ifap;
528 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
529
530 /*
531 * Each device address list is sorted in order of scope -
532 * global before linklocal.
533 */
534 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
535 ifap = &ifa->if_next) {
536 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
537 break;
538 }
539
540 ifp->if_next = *ifap;
541 *ifap = ifp;
542 }
543
544 /*
545 * Hash function taken from net_alias.c
546 */
547 static u8 ipv6_addr_hash(const struct in6_addr *addr)
548 {
549 __u32 word;
550
551 /*
552 * We perform the hash function over the last 64 bits of the address
553 * This will include the IEEE address token on links that support it.
554 */
555
556 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
557 word ^= (word >> 16);
558 word ^= (word >> 8);
559
560 return ((word ^ (word >> 4)) & 0x0f);
561 }
562
563 /* On success it returns ifp with increased reference count */
564
565 static struct inet6_ifaddr *
566 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
567 int scope, u32 flags)
568 {
569 struct inet6_ifaddr *ifa = NULL;
570 struct rt6_info *rt;
571 int hash;
572 int err = 0;
573
574 rcu_read_lock_bh();
575 if (idev->dead) {
576 err = -ENODEV; /*XXX*/
577 goto out2;
578 }
579
580 write_lock(&addrconf_hash_lock);
581
582 /* Ignore adding duplicate addresses on an interface */
583 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
584 ADBG(("ipv6_add_addr: already assigned\n"));
585 err = -EEXIST;
586 goto out;
587 }
588
589 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
590
591 if (ifa == NULL) {
592 ADBG(("ipv6_add_addr: malloc failed\n"));
593 err = -ENOBUFS;
594 goto out;
595 }
596
597 rt = addrconf_dst_alloc(idev, addr, 0);
598 if (IS_ERR(rt)) {
599 err = PTR_ERR(rt);
600 goto out;
601 }
602
603 ipv6_addr_copy(&ifa->addr, addr);
604
605 spin_lock_init(&ifa->lock);
606 init_timer(&ifa->timer);
607 ifa->timer.data = (unsigned long) ifa;
608 ifa->scope = scope;
609 ifa->prefix_len = pfxlen;
610 ifa->flags = flags | IFA_F_TENTATIVE;
611 ifa->cstamp = ifa->tstamp = jiffies;
612
613 ifa->rt = rt;
614
615 /*
616 * part one of RFC 4429, section 3.3
617 * We should not configure an address as
618 * optimistic if we do not yet know the link
619 * layer address of our nexhop router
620 */
621
622 if (rt->rt6i_nexthop == NULL)
623 ifa->flags &= ~IFA_F_OPTIMISTIC;
624
625 ifa->idev = idev;
626 in6_dev_hold(idev);
627 /* For caller */
628 in6_ifa_hold(ifa);
629
630 /* Add to big hash table */
631 hash = ipv6_addr_hash(addr);
632
633 ifa->lst_next = inet6_addr_lst[hash];
634 inet6_addr_lst[hash] = ifa;
635 in6_ifa_hold(ifa);
636 write_unlock(&addrconf_hash_lock);
637
638 write_lock(&idev->lock);
639 /* Add to inet6_dev unicast addr list. */
640 ipv6_link_dev_addr(idev, ifa);
641
642 #ifdef CONFIG_IPV6_PRIVACY
643 if (ifa->flags&IFA_F_TEMPORARY) {
644 ifa->tmp_next = idev->tempaddr_list;
645 idev->tempaddr_list = ifa;
646 in6_ifa_hold(ifa);
647 }
648 #endif
649
650 in6_ifa_hold(ifa);
651 write_unlock(&idev->lock);
652 out2:
653 rcu_read_unlock_bh();
654
655 if (likely(err == 0))
656 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
657 else {
658 kfree(ifa);
659 ifa = ERR_PTR(err);
660 }
661
662 return ifa;
663 out:
664 write_unlock(&addrconf_hash_lock);
665 goto out2;
666 }
667
668 /* This function wants to get referenced ifp and releases it before return */
669
670 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
671 {
672 struct inet6_ifaddr *ifa, **ifap;
673 struct inet6_dev *idev = ifp->idev;
674 int hash;
675 int deleted = 0, onlink = 0;
676 unsigned long expires = jiffies;
677
678 hash = ipv6_addr_hash(&ifp->addr);
679
680 ifp->dead = 1;
681
682 write_lock_bh(&addrconf_hash_lock);
683 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
684 ifap = &ifa->lst_next) {
685 if (ifa == ifp) {
686 *ifap = ifa->lst_next;
687 __in6_ifa_put(ifp);
688 ifa->lst_next = NULL;
689 break;
690 }
691 }
692 write_unlock_bh(&addrconf_hash_lock);
693
694 write_lock_bh(&idev->lock);
695 #ifdef CONFIG_IPV6_PRIVACY
696 if (ifp->flags&IFA_F_TEMPORARY) {
697 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
698 ifap = &ifa->tmp_next) {
699 if (ifa == ifp) {
700 *ifap = ifa->tmp_next;
701 if (ifp->ifpub) {
702 in6_ifa_put(ifp->ifpub);
703 ifp->ifpub = NULL;
704 }
705 __in6_ifa_put(ifp);
706 ifa->tmp_next = NULL;
707 break;
708 }
709 }
710 }
711 #endif
712
713 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
714 if (ifa == ifp) {
715 *ifap = ifa->if_next;
716 __in6_ifa_put(ifp);
717 ifa->if_next = NULL;
718 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
719 break;
720 deleted = 1;
721 continue;
722 } else if (ifp->flags & IFA_F_PERMANENT) {
723 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
724 ifp->prefix_len)) {
725 if (ifa->flags & IFA_F_PERMANENT) {
726 onlink = 1;
727 if (deleted)
728 break;
729 } else {
730 unsigned long lifetime;
731
732 if (!onlink)
733 onlink = -1;
734
735 spin_lock(&ifa->lock);
736 lifetime = min_t(unsigned long,
737 ifa->valid_lft, 0x7fffffffUL/HZ);
738 if (time_before(expires,
739 ifa->tstamp + lifetime * HZ))
740 expires = ifa->tstamp + lifetime * HZ;
741 spin_unlock(&ifa->lock);
742 }
743 }
744 }
745 ifap = &ifa->if_next;
746 }
747 write_unlock_bh(&idev->lock);
748
749 ipv6_ifa_notify(RTM_DELADDR, ifp);
750
751 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
752
753 addrconf_del_timer(ifp);
754
755 /*
756 * Purge or update corresponding prefix
757 *
758 * 1) we don't purge prefix here if address was not permanent.
759 * prefix is managed by its own lifetime.
760 * 2) if there're no addresses, delete prefix.
761 * 3) if there're still other permanent address(es),
762 * corresponding prefix is still permanent.
763 * 4) otherwise, update prefix lifetime to the
764 * longest valid lifetime among the corresponding
765 * addresses on the device.
766 * Note: subsequent RA will update lifetime.
767 *
768 * --yoshfuji
769 */
770 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
771 struct in6_addr prefix;
772 struct rt6_info *rt;
773 struct net *net = dev_net(ifp->idev->dev);
774 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
775 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
776
777 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
778 if (onlink == 0) {
779 ip6_del_rt(rt);
780 rt = NULL;
781 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
782 rt->rt6i_expires = expires;
783 rt->rt6i_flags |= RTF_EXPIRES;
784 }
785 }
786 dst_release(&rt->u.dst);
787 }
788
789 in6_ifa_put(ifp);
790 }
791
792 #ifdef CONFIG_IPV6_PRIVACY
793 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
794 {
795 struct inet6_dev *idev = ifp->idev;
796 struct in6_addr addr, *tmpaddr;
797 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
798 unsigned long regen_advance;
799 int tmp_plen;
800 int ret = 0;
801 int max_addresses;
802 u32 addr_flags;
803
804 write_lock(&idev->lock);
805 if (ift) {
806 spin_lock_bh(&ift->lock);
807 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
808 spin_unlock_bh(&ift->lock);
809 tmpaddr = &addr;
810 } else {
811 tmpaddr = NULL;
812 }
813 retry:
814 in6_dev_hold(idev);
815 if (idev->cnf.use_tempaddr <= 0) {
816 write_unlock(&idev->lock);
817 printk(KERN_INFO
818 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
819 in6_dev_put(idev);
820 ret = -1;
821 goto out;
822 }
823 spin_lock_bh(&ifp->lock);
824 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
825 idev->cnf.use_tempaddr = -1; /*XXX*/
826 spin_unlock_bh(&ifp->lock);
827 write_unlock(&idev->lock);
828 printk(KERN_WARNING
829 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
830 in6_dev_put(idev);
831 ret = -1;
832 goto out;
833 }
834 in6_ifa_hold(ifp);
835 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
836 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
837 spin_unlock_bh(&ifp->lock);
838 write_unlock(&idev->lock);
839 printk(KERN_WARNING
840 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
841 in6_ifa_put(ifp);
842 in6_dev_put(idev);
843 ret = -1;
844 goto out;
845 }
846 memcpy(&addr.s6_addr[8], idev->rndid, 8);
847 tmp_valid_lft = min_t(__u32,
848 ifp->valid_lft,
849 idev->cnf.temp_valid_lft);
850 tmp_prefered_lft = min_t(__u32,
851 ifp->prefered_lft,
852 idev->cnf.temp_prefered_lft - desync_factor / HZ);
853 tmp_plen = ifp->prefix_len;
854 max_addresses = idev->cnf.max_addresses;
855 tmp_cstamp = ifp->cstamp;
856 tmp_tstamp = ifp->tstamp;
857 spin_unlock_bh(&ifp->lock);
858
859 regen_advance = idev->cnf.regen_max_retry *
860 idev->cnf.dad_transmits *
861 idev->nd_parms->retrans_time / HZ;
862 write_unlock(&idev->lock);
863
864 /* A temporary address is created only if this calculated Preferred
865 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
866 * an implementation must not create a temporary address with a zero
867 * Preferred Lifetime.
868 */
869 if (tmp_prefered_lft <= regen_advance) {
870 in6_ifa_put(ifp);
871 in6_dev_put(idev);
872 ret = -1;
873 goto out;
874 }
875
876 addr_flags = IFA_F_TEMPORARY;
877 /* set in addrconf_prefix_rcv() */
878 if (ifp->flags & IFA_F_OPTIMISTIC)
879 addr_flags |= IFA_F_OPTIMISTIC;
880
881 ift = !max_addresses ||
882 ipv6_count_addresses(idev) < max_addresses ?
883 ipv6_add_addr(idev, &addr, tmp_plen,
884 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
885 addr_flags) : NULL;
886 if (!ift || IS_ERR(ift)) {
887 in6_ifa_put(ifp);
888 in6_dev_put(idev);
889 printk(KERN_INFO
890 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
891 tmpaddr = &addr;
892 write_lock(&idev->lock);
893 goto retry;
894 }
895
896 spin_lock_bh(&ift->lock);
897 ift->ifpub = ifp;
898 ift->valid_lft = tmp_valid_lft;
899 ift->prefered_lft = tmp_prefered_lft;
900 ift->cstamp = tmp_cstamp;
901 ift->tstamp = tmp_tstamp;
902 spin_unlock_bh(&ift->lock);
903
904 addrconf_dad_start(ift, 0);
905 in6_ifa_put(ift);
906 in6_dev_put(idev);
907 out:
908 return ret;
909 }
910 #endif
911
912 /*
913 * Choose an appropriate source address (RFC3484)
914 */
915 enum {
916 IPV6_SADDR_RULE_INIT = 0,
917 IPV6_SADDR_RULE_LOCAL,
918 IPV6_SADDR_RULE_SCOPE,
919 IPV6_SADDR_RULE_PREFERRED,
920 #ifdef CONFIG_IPV6_MIP6
921 IPV6_SADDR_RULE_HOA,
922 #endif
923 IPV6_SADDR_RULE_OIF,
924 IPV6_SADDR_RULE_LABEL,
925 #ifdef CONFIG_IPV6_PRIVACY
926 IPV6_SADDR_RULE_PRIVACY,
927 #endif
928 IPV6_SADDR_RULE_ORCHID,
929 IPV6_SADDR_RULE_PREFIX,
930 IPV6_SADDR_RULE_MAX
931 };
932
933 struct ipv6_saddr_score {
934 int rule;
935 int addr_type;
936 struct inet6_ifaddr *ifa;
937 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
938 int scopedist;
939 int matchlen;
940 };
941
942 struct ipv6_saddr_dst {
943 const struct in6_addr *addr;
944 int ifindex;
945 int scope;
946 int label;
947 unsigned int prefs;
948 };
949
950 static inline int ipv6_saddr_preferred(int type)
951 {
952 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
953 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
954 return 1;
955 return 0;
956 }
957
958 static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score,
959 struct ipv6_saddr_dst *dst,
960 int i)
961 {
962 int ret;
963
964 if (i <= score->rule) {
965 switch (i) {
966 case IPV6_SADDR_RULE_SCOPE:
967 ret = score->scopedist;
968 break;
969 case IPV6_SADDR_RULE_PREFIX:
970 ret = score->matchlen;
971 break;
972 default:
973 ret = !!test_bit(i, score->scorebits);
974 }
975 goto out;
976 }
977
978 switch (i) {
979 case IPV6_SADDR_RULE_INIT:
980 /* Rule 0: remember if hiscore is not ready yet */
981 ret = !!score->ifa;
982 break;
983 case IPV6_SADDR_RULE_LOCAL:
984 /* Rule 1: Prefer same address */
985 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
986 break;
987 case IPV6_SADDR_RULE_SCOPE:
988 /* Rule 2: Prefer appropriate scope
989 *
990 * ret
991 * ^
992 * -1 | d 15
993 * ---+--+-+---> scope
994 * |
995 * | d is scope of the destination.
996 * B-d | \
997 * | \ <- smaller scope is better if
998 * B-15 | \ if scope is enough for destinaion.
999 * | ret = B - scope (-1 <= scope >= d <= 15).
1000 * d-C-1 | /
1001 * |/ <- greater is better
1002 * -C / if scope is not enough for destination.
1003 * /| ret = scope - C (-1 <= d < scope <= 15).
1004 *
1005 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1006 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1007 * Assume B = 0 and we get C > 29.
1008 */
1009 ret = __ipv6_addr_src_scope(score->addr_type);
1010 if (ret >= dst->scope)
1011 ret = -ret;
1012 else
1013 ret -= 128; /* 30 is enough */
1014 score->scopedist = ret;
1015 break;
1016 case IPV6_SADDR_RULE_PREFERRED:
1017 /* Rule 3: Avoid deprecated and optimistic addresses */
1018 ret = ipv6_saddr_preferred(score->addr_type) ||
1019 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1020 break;
1021 #ifdef CONFIG_IPV6_MIP6
1022 case IPV6_SADDR_RULE_HOA:
1023 {
1024 /* Rule 4: Prefer home address */
1025 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1026 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1027 break;
1028 }
1029 #endif
1030 case IPV6_SADDR_RULE_OIF:
1031 /* Rule 5: Prefer outgoing interface */
1032 ret = (!dst->ifindex ||
1033 dst->ifindex == score->ifa->idev->dev->ifindex);
1034 break;
1035 case IPV6_SADDR_RULE_LABEL:
1036 /* Rule 6: Prefer matching label */
1037 ret = ipv6_addr_label(&score->ifa->addr, score->addr_type,
1038 score->ifa->idev->dev->ifindex) == dst->label;
1039 break;
1040 #ifdef CONFIG_IPV6_PRIVACY
1041 case IPV6_SADDR_RULE_PRIVACY:
1042 {
1043 /* Rule 7: Prefer public address
1044 * Note: prefer temprary address if use_tempaddr >= 2
1045 */
1046 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1047 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1048 score->ifa->idev->cnf.use_tempaddr >= 2;
1049 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1050 break;
1051 }
1052 #endif
1053 case IPV6_SADDR_RULE_ORCHID:
1054 /* Rule 8-: Prefer ORCHID vs ORCHID or
1055 * non-ORCHID vs non-ORCHID
1056 */
1057 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1058 ipv6_addr_orchid(dst->addr));
1059 break;
1060 case IPV6_SADDR_RULE_PREFIX:
1061 /* Rule 8: Use longest matching prefix */
1062 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1063 dst->addr);
1064 break;
1065 default:
1066 ret = 0;
1067 }
1068
1069 if (ret)
1070 __set_bit(i, score->scorebits);
1071 score->rule = i;
1072 out:
1073 return ret;
1074 }
1075
1076 int ipv6_dev_get_saddr(struct net_device *dst_dev,
1077 const struct in6_addr *daddr, unsigned int prefs,
1078 struct in6_addr *saddr)
1079 {
1080 struct ipv6_saddr_score scores[2],
1081 *score = &scores[0], *hiscore = &scores[1];
1082 struct net *net = dev_net(dst_dev);
1083 struct ipv6_saddr_dst dst;
1084 struct net_device *dev;
1085 int dst_type;
1086
1087 dst_type = __ipv6_addr_type(daddr);
1088 dst.addr = daddr;
1089 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1090 dst.scope = __ipv6_addr_src_scope(dst_type);
1091 dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex);
1092 dst.prefs = prefs;
1093
1094 hiscore->rule = -1;
1095 hiscore->ifa = NULL;
1096
1097 read_lock(&dev_base_lock);
1098 rcu_read_lock();
1099
1100 for_each_netdev(net, dev) {
1101 struct inet6_dev *idev;
1102
1103 /* Candidate Source Address (section 4)
1104 * - multicast and link-local destination address,
1105 * the set of candidate source address MUST only
1106 * include addresses assigned to interfaces
1107 * belonging to the same link as the outgoing
1108 * interface.
1109 * (- For site-local destination addresses, the
1110 * set of candidate source addresses MUST only
1111 * include addresses assigned to interfaces
1112 * belonging to the same site as the outgoing
1113 * interface.)
1114 */
1115 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1116 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1117 dst.ifindex && dev->ifindex != dst.ifindex)
1118 continue;
1119
1120 idev = __in6_dev_get(dev);
1121 if (!idev)
1122 continue;
1123
1124 read_lock_bh(&idev->lock);
1125 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1126 int i;
1127
1128 /*
1129 * - Tentative Address (RFC2462 section 5.4)
1130 * - A tentative address is not considered
1131 * "assigned to an interface" in the traditional
1132 * sense, unless it is also flagged as optimistic.
1133 * - Candidate Source Address (section 4)
1134 * - In any case, anycast addresses, multicast
1135 * addresses, and the unspecified address MUST
1136 * NOT be included in a candidate set.
1137 */
1138 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1139 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1140 continue;
1141
1142 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1143
1144 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1145 score->addr_type & IPV6_ADDR_MULTICAST)) {
1146 LIMIT_NETDEBUG(KERN_DEBUG
1147 "ADDRCONF: unspecified / multicast address "
1148 "assigned as unicast address on %s",
1149 dev->name);
1150 continue;
1151 }
1152
1153 score->rule = -1;
1154 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1155
1156 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1157 int minihiscore, miniscore;
1158
1159 minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i);
1160 miniscore = ipv6_get_saddr_eval(score, &dst, i);
1161
1162 if (minihiscore > miniscore) {
1163 if (i == IPV6_SADDR_RULE_SCOPE &&
1164 score->scopedist > 0) {
1165 /*
1166 * special case:
1167 * each remaining entry
1168 * has too small (not enough)
1169 * scope, because ifa entries
1170 * are sorted by their scope
1171 * values.
1172 */
1173 goto try_nextdev;
1174 }
1175 break;
1176 } else if (minihiscore < miniscore) {
1177 struct ipv6_saddr_score *tmp;
1178
1179 if (hiscore->ifa)
1180 in6_ifa_put(hiscore->ifa);
1181
1182 in6_ifa_hold(score->ifa);
1183
1184 tmp = hiscore;
1185 hiscore = score;
1186 score = tmp;
1187
1188 /* restore our iterator */
1189 score->ifa = hiscore->ifa;
1190
1191 break;
1192 }
1193 }
1194 }
1195 try_nextdev:
1196 read_unlock_bh(&idev->lock);
1197 }
1198 rcu_read_unlock();
1199 read_unlock(&dev_base_lock);
1200
1201 if (!hiscore->ifa)
1202 return -EADDRNOTAVAIL;
1203
1204 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1205 in6_ifa_put(hiscore->ifa);
1206 return 0;
1207 }
1208
1209 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1210
1211 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1212 unsigned char banned_flags)
1213 {
1214 struct inet6_dev *idev;
1215 int err = -EADDRNOTAVAIL;
1216
1217 rcu_read_lock();
1218 if ((idev = __in6_dev_get(dev)) != NULL) {
1219 struct inet6_ifaddr *ifp;
1220
1221 read_lock_bh(&idev->lock);
1222 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1223 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1224 ipv6_addr_copy(addr, &ifp->addr);
1225 err = 0;
1226 break;
1227 }
1228 }
1229 read_unlock_bh(&idev->lock);
1230 }
1231 rcu_read_unlock();
1232 return err;
1233 }
1234
1235 static int ipv6_count_addresses(struct inet6_dev *idev)
1236 {
1237 int cnt = 0;
1238 struct inet6_ifaddr *ifp;
1239
1240 read_lock_bh(&idev->lock);
1241 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1242 cnt++;
1243 read_unlock_bh(&idev->lock);
1244 return cnt;
1245 }
1246
1247 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1248 struct net_device *dev, int strict)
1249 {
1250 struct inet6_ifaddr * ifp;
1251 u8 hash = ipv6_addr_hash(addr);
1252
1253 read_lock_bh(&addrconf_hash_lock);
1254 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1255 if (!net_eq(dev_net(ifp->idev->dev), net))
1256 continue;
1257 if (ipv6_addr_equal(&ifp->addr, addr) &&
1258 !(ifp->flags&IFA_F_TENTATIVE)) {
1259 if (dev == NULL || ifp->idev->dev == dev ||
1260 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1261 break;
1262 }
1263 }
1264 read_unlock_bh(&addrconf_hash_lock);
1265 return ifp != NULL;
1266 }
1267 EXPORT_SYMBOL(ipv6_chk_addr);
1268
1269 static
1270 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1271 struct net_device *dev)
1272 {
1273 struct inet6_ifaddr * ifp;
1274 u8 hash = ipv6_addr_hash(addr);
1275
1276 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1277 if (!net_eq(dev_net(ifp->idev->dev), net))
1278 continue;
1279 if (ipv6_addr_equal(&ifp->addr, addr)) {
1280 if (dev == NULL || ifp->idev->dev == dev)
1281 break;
1282 }
1283 }
1284 return ifp != NULL;
1285 }
1286
1287 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1288 {
1289 struct inet6_dev *idev;
1290 struct inet6_ifaddr *ifa;
1291 int onlink;
1292
1293 onlink = 0;
1294 rcu_read_lock();
1295 idev = __in6_dev_get(dev);
1296 if (idev) {
1297 read_lock_bh(&idev->lock);
1298 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1299 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1300 ifa->prefix_len);
1301 if (onlink)
1302 break;
1303 }
1304 read_unlock_bh(&idev->lock);
1305 }
1306 rcu_read_unlock();
1307 return onlink;
1308 }
1309
1310 EXPORT_SYMBOL(ipv6_chk_prefix);
1311
1312 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1313 struct net_device *dev, int strict)
1314 {
1315 struct inet6_ifaddr * ifp;
1316 u8 hash = ipv6_addr_hash(addr);
1317
1318 read_lock_bh(&addrconf_hash_lock);
1319 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1320 if (!net_eq(dev_net(ifp->idev->dev), net))
1321 continue;
1322 if (ipv6_addr_equal(&ifp->addr, addr)) {
1323 if (dev == NULL || ifp->idev->dev == dev ||
1324 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1325 in6_ifa_hold(ifp);
1326 break;
1327 }
1328 }
1329 }
1330 read_unlock_bh(&addrconf_hash_lock);
1331
1332 return ifp;
1333 }
1334
1335 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1336 {
1337 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1338 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1339 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1340 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1341 int sk_ipv6only = ipv6_only_sock(sk);
1342 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1343 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1344 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1345
1346 if (!sk2_rcv_saddr && !sk_ipv6only)
1347 return 1;
1348
1349 if (addr_type2 == IPV6_ADDR_ANY &&
1350 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1351 return 1;
1352
1353 if (addr_type == IPV6_ADDR_ANY &&
1354 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1355 return 1;
1356
1357 if (sk2_rcv_saddr6 &&
1358 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1359 return 1;
1360
1361 if (addr_type == IPV6_ADDR_MAPPED &&
1362 !sk2_ipv6only &&
1363 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1364 return 1;
1365
1366 return 0;
1367 }
1368
1369 /* Gets referenced address, destroys ifaddr */
1370
1371 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1372 {
1373 if (ifp->flags&IFA_F_PERMANENT) {
1374 spin_lock_bh(&ifp->lock);
1375 addrconf_del_timer(ifp);
1376 ifp->flags |= IFA_F_TENTATIVE;
1377 spin_unlock_bh(&ifp->lock);
1378 in6_ifa_put(ifp);
1379 #ifdef CONFIG_IPV6_PRIVACY
1380 } else if (ifp->flags&IFA_F_TEMPORARY) {
1381 struct inet6_ifaddr *ifpub;
1382 spin_lock_bh(&ifp->lock);
1383 ifpub = ifp->ifpub;
1384 if (ifpub) {
1385 in6_ifa_hold(ifpub);
1386 spin_unlock_bh(&ifp->lock);
1387 ipv6_create_tempaddr(ifpub, ifp);
1388 in6_ifa_put(ifpub);
1389 } else {
1390 spin_unlock_bh(&ifp->lock);
1391 }
1392 ipv6_del_addr(ifp);
1393 #endif
1394 } else
1395 ipv6_del_addr(ifp);
1396 }
1397
1398 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1399 {
1400 if (net_ratelimit())
1401 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1402 addrconf_dad_stop(ifp);
1403 }
1404
1405 /* Join to solicited addr multicast group. */
1406
1407 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1408 {
1409 struct in6_addr maddr;
1410
1411 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1412 return;
1413
1414 addrconf_addr_solict_mult(addr, &maddr);
1415 ipv6_dev_mc_inc(dev, &maddr);
1416 }
1417
1418 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1419 {
1420 struct in6_addr maddr;
1421
1422 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1423 return;
1424
1425 addrconf_addr_solict_mult(addr, &maddr);
1426 __ipv6_dev_mc_dec(idev, &maddr);
1427 }
1428
1429 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1430 {
1431 struct in6_addr addr;
1432 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1433 if (ipv6_addr_any(&addr))
1434 return;
1435 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1436 }
1437
1438 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1439 {
1440 struct in6_addr addr;
1441 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1442 if (ipv6_addr_any(&addr))
1443 return;
1444 __ipv6_dev_ac_dec(ifp->idev, &addr);
1445 }
1446
1447 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1448 {
1449 if (dev->addr_len != ETH_ALEN)
1450 return -1;
1451 memcpy(eui, dev->dev_addr, 3);
1452 memcpy(eui + 5, dev->dev_addr + 3, 3);
1453
1454 /*
1455 * The zSeries OSA network cards can be shared among various
1456 * OS instances, but the OSA cards have only one MAC address.
1457 * This leads to duplicate address conflicts in conjunction
1458 * with IPv6 if more than one instance uses the same card.
1459 *
1460 * The driver for these cards can deliver a unique 16-bit
1461 * identifier for each instance sharing the same card. It is
1462 * placed instead of 0xFFFE in the interface identifier. The
1463 * "u" bit of the interface identifier is not inverted in this
1464 * case. Hence the resulting interface identifier has local
1465 * scope according to RFC2373.
1466 */
1467 if (dev->dev_id) {
1468 eui[3] = (dev->dev_id >> 8) & 0xFF;
1469 eui[4] = dev->dev_id & 0xFF;
1470 } else {
1471 eui[3] = 0xFF;
1472 eui[4] = 0xFE;
1473 eui[0] ^= 2;
1474 }
1475 return 0;
1476 }
1477
1478 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1479 {
1480 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1481 if (dev->addr_len != ARCNET_ALEN)
1482 return -1;
1483 memset(eui, 0, 7);
1484 eui[7] = *(u8*)dev->dev_addr;
1485 return 0;
1486 }
1487
1488 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1489 {
1490 if (dev->addr_len != INFINIBAND_ALEN)
1491 return -1;
1492 memcpy(eui, dev->dev_addr + 12, 8);
1493 eui[0] |= 2;
1494 return 0;
1495 }
1496
1497 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1498 {
1499 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1500 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1501 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1502 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1503 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1504 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1505 eui[1] = 0;
1506 eui[2] = 0x5E;
1507 eui[3] = 0xFE;
1508 memcpy(eui + 4, &addr, 4);
1509 return 0;
1510 }
1511 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1512
1513 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1514 {
1515 if (dev->priv_flags & IFF_ISATAP)
1516 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1517 return -1;
1518 }
1519
1520 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1521 {
1522 switch (dev->type) {
1523 case ARPHRD_ETHER:
1524 case ARPHRD_FDDI:
1525 case ARPHRD_IEEE802_TR:
1526 return addrconf_ifid_eui48(eui, dev);
1527 case ARPHRD_ARCNET:
1528 return addrconf_ifid_arcnet(eui, dev);
1529 case ARPHRD_INFINIBAND:
1530 return addrconf_ifid_infiniband(eui, dev);
1531 case ARPHRD_SIT:
1532 return addrconf_ifid_sit(eui, dev);
1533 }
1534 return -1;
1535 }
1536
1537 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1538 {
1539 int err = -1;
1540 struct inet6_ifaddr *ifp;
1541
1542 read_lock_bh(&idev->lock);
1543 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1544 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1545 memcpy(eui, ifp->addr.s6_addr+8, 8);
1546 err = 0;
1547 break;
1548 }
1549 }
1550 read_unlock_bh(&idev->lock);
1551 return err;
1552 }
1553
1554 #ifdef CONFIG_IPV6_PRIVACY
1555 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1556 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1557 {
1558 regen:
1559 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1560 idev->rndid[0] &= ~0x02;
1561
1562 /*
1563 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1564 * check if generated address is not inappropriate
1565 *
1566 * - Reserved subnet anycast (RFC 2526)
1567 * 11111101 11....11 1xxxxxxx
1568 * - ISATAP (RFC4214) 6.1
1569 * 00-00-5E-FE-xx-xx-xx-xx
1570 * - value 0
1571 * - XXX: already assigned to an address on the device
1572 */
1573 if (idev->rndid[0] == 0xfd &&
1574 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1575 (idev->rndid[7]&0x80))
1576 goto regen;
1577 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1578 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1579 goto regen;
1580 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1581 goto regen;
1582 }
1583
1584 return 0;
1585 }
1586
1587 static void ipv6_regen_rndid(unsigned long data)
1588 {
1589 struct inet6_dev *idev = (struct inet6_dev *) data;
1590 unsigned long expires;
1591
1592 rcu_read_lock_bh();
1593 write_lock_bh(&idev->lock);
1594
1595 if (idev->dead)
1596 goto out;
1597
1598 if (__ipv6_regen_rndid(idev) < 0)
1599 goto out;
1600
1601 expires = jiffies +
1602 idev->cnf.temp_prefered_lft * HZ -
1603 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1604 if (time_before(expires, jiffies)) {
1605 printk(KERN_WARNING
1606 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1607 idev->dev->name);
1608 goto out;
1609 }
1610
1611 if (!mod_timer(&idev->regen_timer, expires))
1612 in6_dev_hold(idev);
1613
1614 out:
1615 write_unlock_bh(&idev->lock);
1616 rcu_read_unlock_bh();
1617 in6_dev_put(idev);
1618 }
1619
1620 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1621 int ret = 0;
1622
1623 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1624 ret = __ipv6_regen_rndid(idev);
1625 return ret;
1626 }
1627 #endif
1628
1629 /*
1630 * Add prefix route.
1631 */
1632
1633 static void
1634 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1635 unsigned long expires, u32 flags)
1636 {
1637 struct fib6_config cfg = {
1638 .fc_table = RT6_TABLE_PREFIX,
1639 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1640 .fc_ifindex = dev->ifindex,
1641 .fc_expires = expires,
1642 .fc_dst_len = plen,
1643 .fc_flags = RTF_UP | flags,
1644 .fc_nlinfo.nl_net = dev_net(dev),
1645 };
1646
1647 ipv6_addr_copy(&cfg.fc_dst, pfx);
1648
1649 /* Prevent useless cloning on PtP SIT.
1650 This thing is done here expecting that the whole
1651 class of non-broadcast devices need not cloning.
1652 */
1653 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1654 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1655 cfg.fc_flags |= RTF_NONEXTHOP;
1656 #endif
1657
1658 ip6_route_add(&cfg);
1659 }
1660
1661 /* Create "default" multicast route to the interface */
1662
1663 static void addrconf_add_mroute(struct net_device *dev)
1664 {
1665 struct fib6_config cfg = {
1666 .fc_table = RT6_TABLE_LOCAL,
1667 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1668 .fc_ifindex = dev->ifindex,
1669 .fc_dst_len = 8,
1670 .fc_flags = RTF_UP,
1671 .fc_nlinfo.nl_net = dev_net(dev),
1672 };
1673
1674 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1675
1676 ip6_route_add(&cfg);
1677 }
1678
1679 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1680 static void sit_route_add(struct net_device *dev)
1681 {
1682 struct fib6_config cfg = {
1683 .fc_table = RT6_TABLE_MAIN,
1684 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1685 .fc_ifindex = dev->ifindex,
1686 .fc_dst_len = 96,
1687 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1688 .fc_nlinfo.nl_net = dev_net(dev),
1689 };
1690
1691 /* prefix length - 96 bits "::d.d.d.d" */
1692 ip6_route_add(&cfg);
1693 }
1694 #endif
1695
1696 static void addrconf_add_lroute(struct net_device *dev)
1697 {
1698 struct in6_addr addr;
1699
1700 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1701 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1702 }
1703
1704 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1705 {
1706 struct inet6_dev *idev;
1707
1708 ASSERT_RTNL();
1709
1710 if ((idev = ipv6_find_idev(dev)) == NULL)
1711 return NULL;
1712
1713 /* Add default multicast route */
1714 addrconf_add_mroute(dev);
1715
1716 /* Add link local route */
1717 addrconf_add_lroute(dev);
1718 return idev;
1719 }
1720
1721 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1722 {
1723 struct prefix_info *pinfo;
1724 __u32 valid_lft;
1725 __u32 prefered_lft;
1726 int addr_type;
1727 unsigned long rt_expires;
1728 struct inet6_dev *in6_dev;
1729
1730 pinfo = (struct prefix_info *) opt;
1731
1732 if (len < sizeof(struct prefix_info)) {
1733 ADBG(("addrconf: prefix option too short\n"));
1734 return;
1735 }
1736
1737 /*
1738 * Validation checks ([ADDRCONF], page 19)
1739 */
1740
1741 addr_type = ipv6_addr_type(&pinfo->prefix);
1742
1743 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1744 return;
1745
1746 valid_lft = ntohl(pinfo->valid);
1747 prefered_lft = ntohl(pinfo->prefered);
1748
1749 if (prefered_lft > valid_lft) {
1750 if (net_ratelimit())
1751 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1752 return;
1753 }
1754
1755 in6_dev = in6_dev_get(dev);
1756
1757 if (in6_dev == NULL) {
1758 if (net_ratelimit())
1759 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1760 return;
1761 }
1762
1763 /*
1764 * Two things going on here:
1765 * 1) Add routes for on-link prefixes
1766 * 2) Configure prefixes with the auto flag set
1767 */
1768
1769 /* Avoid arithmetic overflow. Really, we could
1770 save rt_expires in seconds, likely valid_lft,
1771 but it would require division in fib gc, that it
1772 not good.
1773 */
1774 if (valid_lft >= 0x7FFFFFFF/HZ)
1775 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1776 else
1777 rt_expires = valid_lft * HZ;
1778
1779 /*
1780 * We convert this (in jiffies) to clock_t later.
1781 * Avoid arithmetic overflow there as well.
1782 * Overflow can happen only if HZ < USER_HZ.
1783 */
1784 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1785 rt_expires = 0x7FFFFFFF / USER_HZ;
1786
1787 if (pinfo->onlink) {
1788 struct rt6_info *rt;
1789 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
1790 dev->ifindex, 1);
1791
1792 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1793 if (rt->rt6i_flags&RTF_EXPIRES) {
1794 if (valid_lft == 0) {
1795 ip6_del_rt(rt);
1796 rt = NULL;
1797 } else {
1798 rt->rt6i_expires = jiffies + rt_expires;
1799 }
1800 }
1801 } else if (valid_lft) {
1802 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1803 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1804 }
1805 if (rt)
1806 dst_release(&rt->u.dst);
1807 }
1808
1809 /* Try to figure out our local address for this prefix */
1810
1811 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1812 struct inet6_ifaddr * ifp;
1813 struct in6_addr addr;
1814 int create = 0, update_lft = 0;
1815
1816 if (pinfo->prefix_len == 64) {
1817 memcpy(&addr, &pinfo->prefix, 8);
1818 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1819 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1820 in6_dev_put(in6_dev);
1821 return;
1822 }
1823 goto ok;
1824 }
1825 if (net_ratelimit())
1826 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1827 pinfo->prefix_len);
1828 in6_dev_put(in6_dev);
1829 return;
1830
1831 ok:
1832
1833 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1);
1834
1835 if (ifp == NULL && valid_lft) {
1836 int max_addresses = in6_dev->cnf.max_addresses;
1837 u32 addr_flags = 0;
1838
1839 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1840 if (in6_dev->cnf.optimistic_dad &&
1841 !ipv6_devconf.forwarding)
1842 addr_flags = IFA_F_OPTIMISTIC;
1843 #endif
1844
1845 /* Do not allow to create too much of autoconfigured
1846 * addresses; this would be too easy way to crash kernel.
1847 */
1848 if (!max_addresses ||
1849 ipv6_count_addresses(in6_dev) < max_addresses)
1850 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1851 addr_type&IPV6_ADDR_SCOPE_MASK,
1852 addr_flags);
1853
1854 if (!ifp || IS_ERR(ifp)) {
1855 in6_dev_put(in6_dev);
1856 return;
1857 }
1858
1859 update_lft = create = 1;
1860 ifp->cstamp = jiffies;
1861 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1862 }
1863
1864 if (ifp) {
1865 int flags;
1866 unsigned long now;
1867 #ifdef CONFIG_IPV6_PRIVACY
1868 struct inet6_ifaddr *ift;
1869 #endif
1870 u32 stored_lft;
1871
1872 /* update lifetime (RFC2462 5.5.3 e) */
1873 spin_lock(&ifp->lock);
1874 now = jiffies;
1875 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1876 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1877 else
1878 stored_lft = 0;
1879 if (!update_lft && stored_lft) {
1880 if (valid_lft > MIN_VALID_LIFETIME ||
1881 valid_lft > stored_lft)
1882 update_lft = 1;
1883 else if (stored_lft <= MIN_VALID_LIFETIME) {
1884 /* valid_lft <= stored_lft is always true */
1885 /* XXX: IPsec */
1886 update_lft = 0;
1887 } else {
1888 valid_lft = MIN_VALID_LIFETIME;
1889 if (valid_lft < prefered_lft)
1890 prefered_lft = valid_lft;
1891 update_lft = 1;
1892 }
1893 }
1894
1895 if (update_lft) {
1896 ifp->valid_lft = valid_lft;
1897 ifp->prefered_lft = prefered_lft;
1898 ifp->tstamp = now;
1899 flags = ifp->flags;
1900 ifp->flags &= ~IFA_F_DEPRECATED;
1901 spin_unlock(&ifp->lock);
1902
1903 if (!(flags&IFA_F_TENTATIVE))
1904 ipv6_ifa_notify(0, ifp);
1905 } else
1906 spin_unlock(&ifp->lock);
1907
1908 #ifdef CONFIG_IPV6_PRIVACY
1909 read_lock_bh(&in6_dev->lock);
1910 /* update all temporary addresses in the list */
1911 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1912 /*
1913 * When adjusting the lifetimes of an existing
1914 * temporary address, only lower the lifetimes.
1915 * Implementations must not increase the
1916 * lifetimes of an existing temporary address
1917 * when processing a Prefix Information Option.
1918 */
1919 if (ifp != ift->ifpub)
1920 continue;
1921
1922 spin_lock(&ift->lock);
1923 flags = ift->flags;
1924 if (ift->valid_lft > valid_lft &&
1925 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1926 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1927 if (ift->prefered_lft > prefered_lft &&
1928 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1929 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1930 spin_unlock(&ift->lock);
1931 if (!(flags&IFA_F_TENTATIVE))
1932 ipv6_ifa_notify(0, ift);
1933 }
1934
1935 if (create && in6_dev->cnf.use_tempaddr > 0) {
1936 /*
1937 * When a new public address is created as described in [ADDRCONF],
1938 * also create a new temporary address.
1939 */
1940 read_unlock_bh(&in6_dev->lock);
1941 ipv6_create_tempaddr(ifp, NULL);
1942 } else {
1943 read_unlock_bh(&in6_dev->lock);
1944 }
1945 #endif
1946 in6_ifa_put(ifp);
1947 addrconf_verify(0);
1948 }
1949 }
1950 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1951 in6_dev_put(in6_dev);
1952 }
1953
1954 /*
1955 * Set destination address.
1956 * Special case for SIT interfaces where we create a new "virtual"
1957 * device.
1958 */
1959 int addrconf_set_dstaddr(struct net *net, void __user *arg)
1960 {
1961 struct in6_ifreq ireq;
1962 struct net_device *dev;
1963 int err = -EINVAL;
1964
1965 rtnl_lock();
1966
1967 err = -EFAULT;
1968 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1969 goto err_exit;
1970
1971 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1972
1973 err = -ENODEV;
1974 if (dev == NULL)
1975 goto err_exit;
1976
1977 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1978 if (dev->type == ARPHRD_SIT) {
1979 struct ifreq ifr;
1980 mm_segment_t oldfs;
1981 struct ip_tunnel_parm p;
1982
1983 err = -EADDRNOTAVAIL;
1984 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1985 goto err_exit;
1986
1987 memset(&p, 0, sizeof(p));
1988 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1989 p.iph.saddr = 0;
1990 p.iph.version = 4;
1991 p.iph.ihl = 5;
1992 p.iph.protocol = IPPROTO_IPV6;
1993 p.iph.ttl = 64;
1994 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1995
1996 oldfs = get_fs(); set_fs(KERNEL_DS);
1997 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1998 set_fs(oldfs);
1999
2000 if (err == 0) {
2001 err = -ENOBUFS;
2002 dev = __dev_get_by_name(net, p.name);
2003 if (!dev)
2004 goto err_exit;
2005 err = dev_open(dev);
2006 }
2007 }
2008 #endif
2009
2010 err_exit:
2011 rtnl_unlock();
2012 return err;
2013 }
2014
2015 /*
2016 * Manual configuration of address on an interface
2017 */
2018 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2019 int plen, __u8 ifa_flags, __u32 prefered_lft,
2020 __u32 valid_lft)
2021 {
2022 struct inet6_ifaddr *ifp;
2023 struct inet6_dev *idev;
2024 struct net_device *dev;
2025 int scope;
2026 u32 flags = RTF_EXPIRES;
2027
2028 ASSERT_RTNL();
2029
2030 /* check the lifetime */
2031 if (!valid_lft || prefered_lft > valid_lft)
2032 return -EINVAL;
2033
2034 dev = __dev_get_by_index(net, ifindex);
2035 if (!dev)
2036 return -ENODEV;
2037
2038 if ((idev = addrconf_add_dev(dev)) == NULL)
2039 return -ENOBUFS;
2040
2041 scope = ipv6_addr_scope(pfx);
2042
2043 if (valid_lft == INFINITY_LIFE_TIME) {
2044 ifa_flags |= IFA_F_PERMANENT;
2045 flags = 0;
2046 } else if (valid_lft >= 0x7FFFFFFF/HZ)
2047 valid_lft = 0x7FFFFFFF/HZ;
2048
2049 if (prefered_lft == 0)
2050 ifa_flags |= IFA_F_DEPRECATED;
2051 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2052 (prefered_lft != INFINITY_LIFE_TIME))
2053 prefered_lft = 0x7FFFFFFF/HZ;
2054
2055 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2056
2057 if (!IS_ERR(ifp)) {
2058 spin_lock_bh(&ifp->lock);
2059 ifp->valid_lft = valid_lft;
2060 ifp->prefered_lft = prefered_lft;
2061 ifp->tstamp = jiffies;
2062 spin_unlock_bh(&ifp->lock);
2063
2064 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2065 jiffies_to_clock_t(valid_lft * HZ), flags);
2066 /*
2067 * Note that section 3.1 of RFC 4429 indicates
2068 * that the Optimistic flag should not be set for
2069 * manually configured addresses
2070 */
2071 addrconf_dad_start(ifp, 0);
2072 in6_ifa_put(ifp);
2073 addrconf_verify(0);
2074 return 0;
2075 }
2076
2077 return PTR_ERR(ifp);
2078 }
2079
2080 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2081 int plen)
2082 {
2083 struct inet6_ifaddr *ifp;
2084 struct inet6_dev *idev;
2085 struct net_device *dev;
2086
2087 dev = __dev_get_by_index(net, ifindex);
2088 if (!dev)
2089 return -ENODEV;
2090
2091 if ((idev = __in6_dev_get(dev)) == NULL)
2092 return -ENXIO;
2093
2094 read_lock_bh(&idev->lock);
2095 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2096 if (ifp->prefix_len == plen &&
2097 ipv6_addr_equal(pfx, &ifp->addr)) {
2098 in6_ifa_hold(ifp);
2099 read_unlock_bh(&idev->lock);
2100
2101 ipv6_del_addr(ifp);
2102
2103 /* If the last address is deleted administratively,
2104 disable IPv6 on this interface.
2105 */
2106 if (idev->addr_list == NULL)
2107 addrconf_ifdown(idev->dev, 1);
2108 return 0;
2109 }
2110 }
2111 read_unlock_bh(&idev->lock);
2112 return -EADDRNOTAVAIL;
2113 }
2114
2115
2116 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2117 {
2118 struct in6_ifreq ireq;
2119 int err;
2120
2121 if (!capable(CAP_NET_ADMIN))
2122 return -EPERM;
2123
2124 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2125 return -EFAULT;
2126
2127 rtnl_lock();
2128 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2129 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2130 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2131 rtnl_unlock();
2132 return err;
2133 }
2134
2135 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2136 {
2137 struct in6_ifreq ireq;
2138 int err;
2139
2140 if (!capable(CAP_NET_ADMIN))
2141 return -EPERM;
2142
2143 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2144 return -EFAULT;
2145
2146 rtnl_lock();
2147 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2148 ireq.ifr6_prefixlen);
2149 rtnl_unlock();
2150 return err;
2151 }
2152
2153 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2154 static void sit_add_v4_addrs(struct inet6_dev *idev)
2155 {
2156 struct inet6_ifaddr * ifp;
2157 struct in6_addr addr;
2158 struct net_device *dev;
2159 struct net *net = dev_net(idev->dev);
2160 int scope;
2161
2162 ASSERT_RTNL();
2163
2164 memset(&addr, 0, sizeof(struct in6_addr));
2165 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2166
2167 if (idev->dev->flags&IFF_POINTOPOINT) {
2168 addr.s6_addr32[0] = htonl(0xfe800000);
2169 scope = IFA_LINK;
2170 } else {
2171 scope = IPV6_ADDR_COMPATv4;
2172 }
2173
2174 if (addr.s6_addr32[3]) {
2175 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2176 if (!IS_ERR(ifp)) {
2177 spin_lock_bh(&ifp->lock);
2178 ifp->flags &= ~IFA_F_TENTATIVE;
2179 spin_unlock_bh(&ifp->lock);
2180 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2181 in6_ifa_put(ifp);
2182 }
2183 return;
2184 }
2185
2186 for_each_netdev(net, dev) {
2187 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2188 if (in_dev && (dev->flags & IFF_UP)) {
2189 struct in_ifaddr * ifa;
2190
2191 int flag = scope;
2192
2193 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2194 int plen;
2195
2196 addr.s6_addr32[3] = ifa->ifa_local;
2197
2198 if (ifa->ifa_scope == RT_SCOPE_LINK)
2199 continue;
2200 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2201 if (idev->dev->flags&IFF_POINTOPOINT)
2202 continue;
2203 flag |= IFA_HOST;
2204 }
2205 if (idev->dev->flags&IFF_POINTOPOINT)
2206 plen = 64;
2207 else
2208 plen = 96;
2209
2210 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2211 IFA_F_PERMANENT);
2212 if (!IS_ERR(ifp)) {
2213 spin_lock_bh(&ifp->lock);
2214 ifp->flags &= ~IFA_F_TENTATIVE;
2215 spin_unlock_bh(&ifp->lock);
2216 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2217 in6_ifa_put(ifp);
2218 }
2219 }
2220 }
2221 }
2222 }
2223 #endif
2224
2225 static void init_loopback(struct net_device *dev)
2226 {
2227 struct inet6_dev *idev;
2228 struct inet6_ifaddr * ifp;
2229
2230 /* ::1 */
2231
2232 ASSERT_RTNL();
2233
2234 if ((idev = ipv6_find_idev(dev)) == NULL) {
2235 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2236 return;
2237 }
2238
2239 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2240 if (!IS_ERR(ifp)) {
2241 spin_lock_bh(&ifp->lock);
2242 ifp->flags &= ~IFA_F_TENTATIVE;
2243 spin_unlock_bh(&ifp->lock);
2244 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2245 in6_ifa_put(ifp);
2246 }
2247 }
2248
2249 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2250 {
2251 struct inet6_ifaddr * ifp;
2252 u32 addr_flags = IFA_F_PERMANENT;
2253
2254 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2255 if (idev->cnf.optimistic_dad &&
2256 !ipv6_devconf.forwarding)
2257 addr_flags |= IFA_F_OPTIMISTIC;
2258 #endif
2259
2260
2261 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2262 if (!IS_ERR(ifp)) {
2263 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2264 addrconf_dad_start(ifp, 0);
2265 in6_ifa_put(ifp);
2266 }
2267 }
2268
2269 static void addrconf_dev_config(struct net_device *dev)
2270 {
2271 struct in6_addr addr;
2272 struct inet6_dev * idev;
2273
2274 ASSERT_RTNL();
2275
2276 if ((dev->type != ARPHRD_ETHER) &&
2277 (dev->type != ARPHRD_FDDI) &&
2278 (dev->type != ARPHRD_IEEE802_TR) &&
2279 (dev->type != ARPHRD_ARCNET) &&
2280 (dev->type != ARPHRD_INFINIBAND)) {
2281 /* Alas, we support only Ethernet autoconfiguration. */
2282 return;
2283 }
2284
2285 idev = addrconf_add_dev(dev);
2286 if (idev == NULL)
2287 return;
2288
2289 memset(&addr, 0, sizeof(struct in6_addr));
2290 addr.s6_addr32[0] = htonl(0xFE800000);
2291
2292 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2293 addrconf_add_linklocal(idev, &addr);
2294 }
2295
2296 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2297 static void addrconf_sit_config(struct net_device *dev)
2298 {
2299 struct inet6_dev *idev;
2300
2301 ASSERT_RTNL();
2302
2303 /*
2304 * Configure the tunnel with one of our IPv4
2305 * addresses... we should configure all of
2306 * our v4 addrs in the tunnel
2307 */
2308
2309 if ((idev = ipv6_find_idev(dev)) == NULL) {
2310 printk(KERN_DEBUG "init sit: add_dev failed\n");
2311 return;
2312 }
2313
2314 if (dev->priv_flags & IFF_ISATAP) {
2315 struct in6_addr addr;
2316
2317 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2318 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2319 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2320 addrconf_add_linklocal(idev, &addr);
2321 return;
2322 }
2323
2324 sit_add_v4_addrs(idev);
2325
2326 if (dev->flags&IFF_POINTOPOINT) {
2327 addrconf_add_mroute(dev);
2328 addrconf_add_lroute(dev);
2329 } else
2330 sit_route_add(dev);
2331 }
2332 #endif
2333
2334 static inline int
2335 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2336 {
2337 struct in6_addr lladdr;
2338
2339 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2340 addrconf_add_linklocal(idev, &lladdr);
2341 return 0;
2342 }
2343 return -1;
2344 }
2345
2346 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2347 {
2348 struct net_device *link_dev;
2349 struct net *net = dev_net(idev->dev);
2350
2351 /* first try to inherit the link-local address from the link device */
2352 if (idev->dev->iflink &&
2353 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2354 if (!ipv6_inherit_linklocal(idev, link_dev))
2355 return;
2356 }
2357 /* then try to inherit it from any device */
2358 for_each_netdev(net, link_dev) {
2359 if (!ipv6_inherit_linklocal(idev, link_dev))
2360 return;
2361 }
2362 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2363 }
2364
2365 /*
2366 * Autoconfigure tunnel with a link-local address so routing protocols,
2367 * DHCPv6, MLD etc. can be run over the virtual link
2368 */
2369
2370 static void addrconf_ip6_tnl_config(struct net_device *dev)
2371 {
2372 struct inet6_dev *idev;
2373
2374 ASSERT_RTNL();
2375
2376 if ((idev = addrconf_add_dev(dev)) == NULL) {
2377 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2378 return;
2379 }
2380 ip6_tnl_add_linklocal(idev);
2381 }
2382
2383 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2384 void * data)
2385 {
2386 struct net_device *dev = (struct net_device *) data;
2387 struct inet6_dev *idev = __in6_dev_get(dev);
2388 int run_pending = 0;
2389 int err;
2390
2391 switch(event) {
2392 case NETDEV_REGISTER:
2393 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2394 idev = ipv6_add_dev(dev);
2395 if (!idev)
2396 return notifier_from_errno(-ENOMEM);
2397 }
2398 break;
2399 case NETDEV_UP:
2400 case NETDEV_CHANGE:
2401 if (dev->flags & IFF_SLAVE)
2402 break;
2403
2404 if (event == NETDEV_UP) {
2405 if (!addrconf_qdisc_ok(dev)) {
2406 /* device is not ready yet. */
2407 printk(KERN_INFO
2408 "ADDRCONF(NETDEV_UP): %s: "
2409 "link is not ready\n",
2410 dev->name);
2411 break;
2412 }
2413
2414 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2415 idev = ipv6_add_dev(dev);
2416
2417 if (idev)
2418 idev->if_flags |= IF_READY;
2419 } else {
2420 if (!addrconf_qdisc_ok(dev)) {
2421 /* device is still not ready. */
2422 break;
2423 }
2424
2425 if (idev) {
2426 if (idev->if_flags & IF_READY) {
2427 /* device is already configured. */
2428 break;
2429 }
2430 idev->if_flags |= IF_READY;
2431 }
2432
2433 printk(KERN_INFO
2434 "ADDRCONF(NETDEV_CHANGE): %s: "
2435 "link becomes ready\n",
2436 dev->name);
2437
2438 run_pending = 1;
2439 }
2440
2441 switch(dev->type) {
2442 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2443 case ARPHRD_SIT:
2444 addrconf_sit_config(dev);
2445 break;
2446 #endif
2447 case ARPHRD_TUNNEL6:
2448 addrconf_ip6_tnl_config(dev);
2449 break;
2450 case ARPHRD_LOOPBACK:
2451 init_loopback(dev);
2452 break;
2453
2454 default:
2455 addrconf_dev_config(dev);
2456 break;
2457 }
2458 if (idev) {
2459 if (run_pending)
2460 addrconf_dad_run(idev);
2461
2462 /* If the MTU changed during the interface down, when the
2463 interface up, the changed MTU must be reflected in the
2464 idev as well as routers.
2465 */
2466 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2467 rt6_mtu_change(dev, dev->mtu);
2468 idev->cnf.mtu6 = dev->mtu;
2469 }
2470 idev->tstamp = jiffies;
2471 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2472 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2473 stop IPv6 on this interface.
2474 */
2475 if (dev->mtu < IPV6_MIN_MTU)
2476 addrconf_ifdown(dev, event != NETDEV_DOWN);
2477 }
2478 break;
2479
2480 case NETDEV_CHANGEMTU:
2481 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2482 rt6_mtu_change(dev, dev->mtu);
2483 idev->cnf.mtu6 = dev->mtu;
2484 break;
2485 }
2486
2487 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2488 idev = ipv6_add_dev(dev);
2489 if (idev)
2490 break;
2491 }
2492
2493 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2494
2495 case NETDEV_DOWN:
2496 case NETDEV_UNREGISTER:
2497 /*
2498 * Remove all addresses from this interface.
2499 */
2500 addrconf_ifdown(dev, event != NETDEV_DOWN);
2501 break;
2502
2503 case NETDEV_CHANGENAME:
2504 if (idev) {
2505 snmp6_unregister_dev(idev);
2506 addrconf_sysctl_unregister(idev);
2507 addrconf_sysctl_register(idev);
2508 err = snmp6_register_dev(idev);
2509 if (err)
2510 return notifier_from_errno(err);
2511 }
2512 break;
2513 }
2514
2515 return NOTIFY_OK;
2516 }
2517
2518 /*
2519 * addrconf module should be notified of a device going up
2520 */
2521 static struct notifier_block ipv6_dev_notf = {
2522 .notifier_call = addrconf_notify,
2523 .priority = 0
2524 };
2525
2526 static int addrconf_ifdown(struct net_device *dev, int how)
2527 {
2528 struct inet6_dev *idev;
2529 struct inet6_ifaddr *ifa, **bifa;
2530 struct net *net = dev_net(dev);
2531 int i;
2532
2533 ASSERT_RTNL();
2534
2535 if (dev == init_net.loopback_dev && how == 1)
2536 how = 0;
2537
2538 rt6_ifdown(net, dev);
2539 neigh_ifdown(&nd_tbl, dev);
2540
2541 idev = __in6_dev_get(dev);
2542 if (idev == NULL)
2543 return -ENODEV;
2544
2545 /* Step 1: remove reference to ipv6 device from parent device.
2546 Do not dev_put!
2547 */
2548 if (how == 1) {
2549 idev->dead = 1;
2550
2551 /* protected by rtnl_lock */
2552 rcu_assign_pointer(dev->ip6_ptr, NULL);
2553
2554 /* Step 1.5: remove snmp6 entry */
2555 snmp6_unregister_dev(idev);
2556
2557 }
2558
2559 /* Step 2: clear hash table */
2560 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2561 bifa = &inet6_addr_lst[i];
2562
2563 write_lock_bh(&addrconf_hash_lock);
2564 while ((ifa = *bifa) != NULL) {
2565 if (ifa->idev == idev) {
2566 *bifa = ifa->lst_next;
2567 ifa->lst_next = NULL;
2568 addrconf_del_timer(ifa);
2569 in6_ifa_put(ifa);
2570 continue;
2571 }
2572 bifa = &ifa->lst_next;
2573 }
2574 write_unlock_bh(&addrconf_hash_lock);
2575 }
2576
2577 write_lock_bh(&idev->lock);
2578
2579 /* Step 3: clear flags for stateless addrconf */
2580 if (how != 1)
2581 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2582
2583 /* Step 4: clear address list */
2584 #ifdef CONFIG_IPV6_PRIVACY
2585 if (how == 1 && del_timer(&idev->regen_timer))
2586 in6_dev_put(idev);
2587
2588 /* clear tempaddr list */
2589 while ((ifa = idev->tempaddr_list) != NULL) {
2590 idev->tempaddr_list = ifa->tmp_next;
2591 ifa->tmp_next = NULL;
2592 ifa->dead = 1;
2593 write_unlock_bh(&idev->lock);
2594 spin_lock_bh(&ifa->lock);
2595
2596 if (ifa->ifpub) {
2597 in6_ifa_put(ifa->ifpub);
2598 ifa->ifpub = NULL;
2599 }
2600 spin_unlock_bh(&ifa->lock);
2601 in6_ifa_put(ifa);
2602 write_lock_bh(&idev->lock);
2603 }
2604 #endif
2605 while ((ifa = idev->addr_list) != NULL) {
2606 idev->addr_list = ifa->if_next;
2607 ifa->if_next = NULL;
2608 ifa->dead = 1;
2609 addrconf_del_timer(ifa);
2610 write_unlock_bh(&idev->lock);
2611
2612 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2613 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2614 in6_ifa_put(ifa);
2615
2616 write_lock_bh(&idev->lock);
2617 }
2618 write_unlock_bh(&idev->lock);
2619
2620 /* Step 5: Discard multicast list */
2621
2622 if (how == 1)
2623 ipv6_mc_destroy_dev(idev);
2624 else
2625 ipv6_mc_down(idev);
2626
2627 idev->tstamp = jiffies;
2628
2629 /* Shot the device (if unregistered) */
2630
2631 if (how == 1) {
2632 addrconf_sysctl_unregister(idev);
2633 neigh_parms_release(&nd_tbl, idev->nd_parms);
2634 neigh_ifdown(&nd_tbl, dev);
2635 in6_dev_put(idev);
2636 }
2637 return 0;
2638 }
2639
2640 static void addrconf_rs_timer(unsigned long data)
2641 {
2642 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2643
2644 if (ifp->idev->cnf.forwarding)
2645 goto out;
2646
2647 if (ifp->idev->if_flags & IF_RA_RCVD) {
2648 /*
2649 * Announcement received after solicitation
2650 * was sent
2651 */
2652 goto out;
2653 }
2654
2655 spin_lock(&ifp->lock);
2656 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2657 struct in6_addr all_routers;
2658
2659 /* The wait after the last probe can be shorter */
2660 addrconf_mod_timer(ifp, AC_RS,
2661 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2662 ifp->idev->cnf.rtr_solicit_delay :
2663 ifp->idev->cnf.rtr_solicit_interval);
2664 spin_unlock(&ifp->lock);
2665
2666 ipv6_addr_all_routers(&all_routers);
2667
2668 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2669 } else {
2670 spin_unlock(&ifp->lock);
2671 /*
2672 * Note: we do not support deprecated "all on-link"
2673 * assumption any longer.
2674 */
2675 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2676 ifp->idev->dev->name);
2677 }
2678
2679 out:
2680 in6_ifa_put(ifp);
2681 }
2682
2683 /*
2684 * Duplicate Address Detection
2685 */
2686 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2687 {
2688 unsigned long rand_num;
2689 struct inet6_dev *idev = ifp->idev;
2690
2691 if (ifp->flags & IFA_F_OPTIMISTIC)
2692 rand_num = 0;
2693 else
2694 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2695
2696 ifp->probes = idev->cnf.dad_transmits;
2697 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2698 }
2699
2700 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2701 {
2702 struct inet6_dev *idev = ifp->idev;
2703 struct net_device *dev = idev->dev;
2704
2705 addrconf_join_solict(dev, &ifp->addr);
2706
2707 net_srandom(ifp->addr.s6_addr32[3]);
2708
2709 read_lock_bh(&idev->lock);
2710 if (ifp->dead)
2711 goto out;
2712 spin_lock_bh(&ifp->lock);
2713
2714 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2715 !(ifp->flags&IFA_F_TENTATIVE) ||
2716 ifp->flags & IFA_F_NODAD) {
2717 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2718 spin_unlock_bh(&ifp->lock);
2719 read_unlock_bh(&idev->lock);
2720
2721 addrconf_dad_completed(ifp);
2722 return;
2723 }
2724
2725 if (!(idev->if_flags & IF_READY)) {
2726 spin_unlock_bh(&ifp->lock);
2727 read_unlock_bh(&idev->lock);
2728 /*
2729 * If the defice is not ready:
2730 * - keep it tentative if it is a permanent address.
2731 * - otherwise, kill it.
2732 */
2733 in6_ifa_hold(ifp);
2734 addrconf_dad_stop(ifp);
2735 return;
2736 }
2737
2738 /*
2739 * Optimistic nodes can start receiving
2740 * Frames right away
2741 */
2742 if(ifp->flags & IFA_F_OPTIMISTIC)
2743 ip6_ins_rt(ifp->rt);
2744
2745 addrconf_dad_kick(ifp);
2746 spin_unlock_bh(&ifp->lock);
2747 out:
2748 read_unlock_bh(&idev->lock);
2749 }
2750
2751 static void addrconf_dad_timer(unsigned long data)
2752 {
2753 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2754 struct inet6_dev *idev = ifp->idev;
2755 struct in6_addr unspec;
2756 struct in6_addr mcaddr;
2757
2758 read_lock_bh(&idev->lock);
2759 if (idev->dead) {
2760 read_unlock_bh(&idev->lock);
2761 goto out;
2762 }
2763 spin_lock_bh(&ifp->lock);
2764 if (ifp->probes == 0) {
2765 /*
2766 * DAD was successful
2767 */
2768
2769 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2770 spin_unlock_bh(&ifp->lock);
2771 read_unlock_bh(&idev->lock);
2772
2773 addrconf_dad_completed(ifp);
2774
2775 goto out;
2776 }
2777
2778 ifp->probes--;
2779 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2780 spin_unlock_bh(&ifp->lock);
2781 read_unlock_bh(&idev->lock);
2782
2783 /* send a neighbour solicitation for our addr */
2784 memset(&unspec, 0, sizeof(unspec));
2785 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2786 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2787 out:
2788 in6_ifa_put(ifp);
2789 }
2790
2791 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2792 {
2793 struct net_device * dev = ifp->idev->dev;
2794
2795 /*
2796 * Configure the address for reception. Now it is valid.
2797 */
2798
2799 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2800
2801 /* If added prefix is link local and forwarding is off,
2802 start sending router solicitations.
2803 */
2804
2805 if (ifp->idev->cnf.forwarding == 0 &&
2806 ifp->idev->cnf.rtr_solicits > 0 &&
2807 (dev->flags&IFF_LOOPBACK) == 0 &&
2808 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2809 struct in6_addr all_routers;
2810
2811 ipv6_addr_all_routers(&all_routers);
2812
2813 /*
2814 * If a host as already performed a random delay
2815 * [...] as part of DAD [...] there is no need
2816 * to delay again before sending the first RS
2817 */
2818 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2819
2820 spin_lock_bh(&ifp->lock);
2821 ifp->probes = 1;
2822 ifp->idev->if_flags |= IF_RS_SENT;
2823 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2824 spin_unlock_bh(&ifp->lock);
2825 }
2826 }
2827
2828 static void addrconf_dad_run(struct inet6_dev *idev) {
2829 struct inet6_ifaddr *ifp;
2830
2831 read_lock_bh(&idev->lock);
2832 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2833 spin_lock_bh(&ifp->lock);
2834 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2835 spin_unlock_bh(&ifp->lock);
2836 continue;
2837 }
2838 spin_unlock_bh(&ifp->lock);
2839 addrconf_dad_kick(ifp);
2840 }
2841 read_unlock_bh(&idev->lock);
2842 }
2843
2844 #ifdef CONFIG_PROC_FS
2845 struct if6_iter_state {
2846 struct seq_net_private p;
2847 int bucket;
2848 };
2849
2850 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2851 {
2852 struct inet6_ifaddr *ifa = NULL;
2853 struct if6_iter_state *state = seq->private;
2854 struct net *net = seq_file_net(seq);
2855
2856 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2857 ifa = inet6_addr_lst[state->bucket];
2858
2859 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2860 ifa = ifa->lst_next;
2861 if (ifa)
2862 break;
2863 }
2864 return ifa;
2865 }
2866
2867 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2868 {
2869 struct if6_iter_state *state = seq->private;
2870 struct net *net = seq_file_net(seq);
2871
2872 ifa = ifa->lst_next;
2873 try_again:
2874 if (ifa) {
2875 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2876 ifa = ifa->lst_next;
2877 goto try_again;
2878 }
2879 }
2880
2881 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2882 ifa = inet6_addr_lst[state->bucket];
2883 goto try_again;
2884 }
2885
2886 return ifa;
2887 }
2888
2889 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2890 {
2891 struct inet6_ifaddr *ifa = if6_get_first(seq);
2892
2893 if (ifa)
2894 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2895 --pos;
2896 return pos ? NULL : ifa;
2897 }
2898
2899 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2900 __acquires(addrconf_hash_lock)
2901 {
2902 read_lock_bh(&addrconf_hash_lock);
2903 return if6_get_idx(seq, *pos);
2904 }
2905
2906 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2907 {
2908 struct inet6_ifaddr *ifa;
2909
2910 ifa = if6_get_next(seq, v);
2911 ++*pos;
2912 return ifa;
2913 }
2914
2915 static void if6_seq_stop(struct seq_file *seq, void *v)
2916 __releases(addrconf_hash_lock)
2917 {
2918 read_unlock_bh(&addrconf_hash_lock);
2919 }
2920
2921 static int if6_seq_show(struct seq_file *seq, void *v)
2922 {
2923 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2924 seq_printf(seq,
2925 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2926 NIP6(ifp->addr),
2927 ifp->idev->dev->ifindex,
2928 ifp->prefix_len,
2929 ifp->scope,
2930 ifp->flags,
2931 ifp->idev->dev->name);
2932 return 0;
2933 }
2934
2935 static const struct seq_operations if6_seq_ops = {
2936 .start = if6_seq_start,
2937 .next = if6_seq_next,
2938 .show = if6_seq_show,
2939 .stop = if6_seq_stop,
2940 };
2941
2942 static int if6_seq_open(struct inode *inode, struct file *file)
2943 {
2944 return seq_open_net(inode, file, &if6_seq_ops,
2945 sizeof(struct if6_iter_state));
2946 }
2947
2948 static const struct file_operations if6_fops = {
2949 .owner = THIS_MODULE,
2950 .open = if6_seq_open,
2951 .read = seq_read,
2952 .llseek = seq_lseek,
2953 .release = seq_release_net,
2954 };
2955
2956 static int if6_proc_net_init(struct net *net)
2957 {
2958 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2959 return -ENOMEM;
2960 return 0;
2961 }
2962
2963 static void if6_proc_net_exit(struct net *net)
2964 {
2965 proc_net_remove(net, "if_inet6");
2966 }
2967
2968 static struct pernet_operations if6_proc_net_ops = {
2969 .init = if6_proc_net_init,
2970 .exit = if6_proc_net_exit,
2971 };
2972
2973 int __init if6_proc_init(void)
2974 {
2975 return register_pernet_subsys(&if6_proc_net_ops);
2976 }
2977
2978 void if6_proc_exit(void)
2979 {
2980 unregister_pernet_subsys(&if6_proc_net_ops);
2981 }
2982 #endif /* CONFIG_PROC_FS */
2983
2984 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2985 /* Check if address is a home address configured on any interface. */
2986 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2987 {
2988 int ret = 0;
2989 struct inet6_ifaddr * ifp;
2990 u8 hash = ipv6_addr_hash(addr);
2991 read_lock_bh(&addrconf_hash_lock);
2992 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2993 if (!net_eq(dev_net(ifp->idev->dev), net))
2994 continue;
2995 if (ipv6_addr_equal(&ifp->addr, addr) &&
2996 (ifp->flags & IFA_F_HOMEADDRESS)) {
2997 ret = 1;
2998 break;
2999 }
3000 }
3001 read_unlock_bh(&addrconf_hash_lock);
3002 return ret;
3003 }
3004 #endif
3005
3006 /*
3007 * Periodic address status verification
3008 */
3009
3010 static void addrconf_verify(unsigned long foo)
3011 {
3012 struct inet6_ifaddr *ifp;
3013 unsigned long now, next;
3014 int i;
3015
3016 spin_lock_bh(&addrconf_verify_lock);
3017 now = jiffies;
3018 next = now + ADDR_CHECK_FREQUENCY;
3019
3020 del_timer(&addr_chk_timer);
3021
3022 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3023
3024 restart:
3025 read_lock(&addrconf_hash_lock);
3026 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3027 unsigned long age;
3028 #ifdef CONFIG_IPV6_PRIVACY
3029 unsigned long regen_advance;
3030 #endif
3031
3032 if (ifp->flags & IFA_F_PERMANENT)
3033 continue;
3034
3035 spin_lock(&ifp->lock);
3036 age = (now - ifp->tstamp) / HZ;
3037
3038 #ifdef CONFIG_IPV6_PRIVACY
3039 regen_advance = ifp->idev->cnf.regen_max_retry *
3040 ifp->idev->cnf.dad_transmits *
3041 ifp->idev->nd_parms->retrans_time / HZ;
3042 #endif
3043
3044 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3045 age >= ifp->valid_lft) {
3046 spin_unlock(&ifp->lock);
3047 in6_ifa_hold(ifp);
3048 read_unlock(&addrconf_hash_lock);
3049 ipv6_del_addr(ifp);
3050 goto restart;
3051 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3052 spin_unlock(&ifp->lock);
3053 continue;
3054 } else if (age >= ifp->prefered_lft) {
3055 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3056 int deprecate = 0;
3057
3058 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3059 deprecate = 1;
3060 ifp->flags |= IFA_F_DEPRECATED;
3061 }
3062
3063 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3064 next = ifp->tstamp + ifp->valid_lft * HZ;
3065
3066 spin_unlock(&ifp->lock);
3067
3068 if (deprecate) {
3069 in6_ifa_hold(ifp);
3070 read_unlock(&addrconf_hash_lock);
3071
3072 ipv6_ifa_notify(0, ifp);
3073 in6_ifa_put(ifp);
3074 goto restart;
3075 }
3076 #ifdef CONFIG_IPV6_PRIVACY
3077 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3078 !(ifp->flags&IFA_F_TENTATIVE)) {
3079 if (age >= ifp->prefered_lft - regen_advance) {
3080 struct inet6_ifaddr *ifpub = ifp->ifpub;
3081 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3082 next = ifp->tstamp + ifp->prefered_lft * HZ;
3083 if (!ifp->regen_count && ifpub) {
3084 ifp->regen_count++;
3085 in6_ifa_hold(ifp);
3086 in6_ifa_hold(ifpub);
3087 spin_unlock(&ifp->lock);
3088 read_unlock(&addrconf_hash_lock);
3089 spin_lock(&ifpub->lock);
3090 ifpub->regen_count = 0;
3091 spin_unlock(&ifpub->lock);
3092 ipv6_create_tempaddr(ifpub, ifp);
3093 in6_ifa_put(ifpub);
3094 in6_ifa_put(ifp);
3095 goto restart;
3096 }
3097 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3098 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3099 spin_unlock(&ifp->lock);
3100 #endif
3101 } else {
3102 /* ifp->prefered_lft <= ifp->valid_lft */
3103 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3104 next = ifp->tstamp + ifp->prefered_lft * HZ;
3105 spin_unlock(&ifp->lock);
3106 }
3107 }
3108 read_unlock(&addrconf_hash_lock);
3109 }
3110
3111 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3112 add_timer(&addr_chk_timer);
3113 spin_unlock_bh(&addrconf_verify_lock);
3114 }
3115
3116 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3117 {
3118 struct in6_addr *pfx = NULL;
3119
3120 if (addr)
3121 pfx = nla_data(addr);
3122
3123 if (local) {
3124 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3125 pfx = NULL;
3126 else
3127 pfx = nla_data(local);
3128 }
3129
3130 return pfx;
3131 }
3132
3133 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3134 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3135 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3136 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3137 };
3138
3139 static int
3140 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3141 {
3142 struct net *net = sock_net(skb->sk);
3143 struct ifaddrmsg *ifm;
3144 struct nlattr *tb[IFA_MAX+1];
3145 struct in6_addr *pfx;
3146 int err;
3147
3148 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3149 if (err < 0)
3150 return err;
3151
3152 ifm = nlmsg_data(nlh);
3153 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3154 if (pfx == NULL)
3155 return -EINVAL;
3156
3157 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3158 }
3159
3160 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3161 u32 prefered_lft, u32 valid_lft)
3162 {
3163 u32 flags = RTF_EXPIRES;
3164
3165 if (!valid_lft || (prefered_lft > valid_lft))
3166 return -EINVAL;
3167
3168 if (valid_lft == INFINITY_LIFE_TIME) {
3169 ifa_flags |= IFA_F_PERMANENT;
3170 flags = 0;
3171 } else if (valid_lft >= 0x7FFFFFFF/HZ)
3172 valid_lft = 0x7FFFFFFF/HZ;
3173
3174 if (prefered_lft == 0)
3175 ifa_flags |= IFA_F_DEPRECATED;
3176 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3177 (prefered_lft != INFINITY_LIFE_TIME))
3178 prefered_lft = 0x7FFFFFFF/HZ;
3179
3180 spin_lock_bh(&ifp->lock);
3181 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3182 ifp->tstamp = jiffies;
3183 ifp->valid_lft = valid_lft;
3184 ifp->prefered_lft = prefered_lft;
3185
3186 spin_unlock_bh(&ifp->lock);
3187 if (!(ifp->flags&IFA_F_TENTATIVE))
3188 ipv6_ifa_notify(0, ifp);
3189
3190 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3191 jiffies_to_clock_t(valid_lft * HZ), flags);
3192 addrconf_verify(0);
3193
3194 return 0;
3195 }
3196
3197 static int
3198 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3199 {
3200 struct net *net = sock_net(skb->sk);
3201 struct ifaddrmsg *ifm;
3202 struct nlattr *tb[IFA_MAX+1];
3203 struct in6_addr *pfx;
3204 struct inet6_ifaddr *ifa;
3205 struct net_device *dev;
3206 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3207 u8 ifa_flags;
3208 int err;
3209
3210 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3211 if (err < 0)
3212 return err;
3213
3214 ifm = nlmsg_data(nlh);
3215 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3216 if (pfx == NULL)
3217 return -EINVAL;
3218
3219 if (tb[IFA_CACHEINFO]) {
3220 struct ifa_cacheinfo *ci;
3221
3222 ci = nla_data(tb[IFA_CACHEINFO]);
3223 valid_lft = ci->ifa_valid;
3224 preferred_lft = ci->ifa_prefered;
3225 } else {
3226 preferred_lft = INFINITY_LIFE_TIME;
3227 valid_lft = INFINITY_LIFE_TIME;
3228 }
3229
3230 dev = __dev_get_by_index(net, ifm->ifa_index);
3231 if (dev == NULL)
3232 return -ENODEV;
3233
3234 /* We ignore other flags so far. */
3235 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3236
3237 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3238 if (ifa == NULL) {
3239 /*
3240 * It would be best to check for !NLM_F_CREATE here but
3241 * userspace alreay relies on not having to provide this.
3242 */
3243 return inet6_addr_add(net, ifm->ifa_index, pfx,
3244 ifm->ifa_prefixlen, ifa_flags,
3245 preferred_lft, valid_lft);
3246 }
3247
3248 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3249 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3250 err = -EEXIST;
3251 else
3252 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3253
3254 in6_ifa_put(ifa);
3255
3256 return err;
3257 }
3258
3259 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3260 u8 scope, int ifindex)
3261 {
3262 struct ifaddrmsg *ifm;
3263
3264 ifm = nlmsg_data(nlh);
3265 ifm->ifa_family = AF_INET6;
3266 ifm->ifa_prefixlen = prefixlen;
3267 ifm->ifa_flags = flags;
3268 ifm->ifa_scope = scope;
3269 ifm->ifa_index = ifindex;
3270 }
3271
3272 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3273 unsigned long tstamp, u32 preferred, u32 valid)
3274 {
3275 struct ifa_cacheinfo ci;
3276
3277 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3278 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3279 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3280 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3281 ci.ifa_prefered = preferred;
3282 ci.ifa_valid = valid;
3283
3284 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3285 }
3286
3287 static inline int rt_scope(int ifa_scope)
3288 {
3289 if (ifa_scope & IFA_HOST)
3290 return RT_SCOPE_HOST;
3291 else if (ifa_scope & IFA_LINK)
3292 return RT_SCOPE_LINK;
3293 else if (ifa_scope & IFA_SITE)
3294 return RT_SCOPE_SITE;
3295 else
3296 return RT_SCOPE_UNIVERSE;
3297 }
3298
3299 static inline int inet6_ifaddr_msgsize(void)
3300 {
3301 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3302 + nla_total_size(16) /* IFA_ADDRESS */
3303 + nla_total_size(sizeof(struct ifa_cacheinfo));
3304 }
3305
3306 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3307 u32 pid, u32 seq, int event, unsigned int flags)
3308 {
3309 struct nlmsghdr *nlh;
3310 u32 preferred, valid;
3311
3312 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3313 if (nlh == NULL)
3314 return -EMSGSIZE;
3315
3316 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3317 ifa->idev->dev->ifindex);
3318
3319 if (!(ifa->flags&IFA_F_PERMANENT)) {
3320 preferred = ifa->prefered_lft;
3321 valid = ifa->valid_lft;
3322 if (preferred != INFINITY_LIFE_TIME) {
3323 long tval = (jiffies - ifa->tstamp)/HZ;
3324 preferred -= tval;
3325 if (valid != INFINITY_LIFE_TIME)
3326 valid -= tval;
3327 }
3328 } else {
3329 preferred = INFINITY_LIFE_TIME;
3330 valid = INFINITY_LIFE_TIME;
3331 }
3332
3333 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3334 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3335 nlmsg_cancel(skb, nlh);
3336 return -EMSGSIZE;
3337 }
3338
3339 return nlmsg_end(skb, nlh);
3340 }
3341
3342 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3343 u32 pid, u32 seq, int event, u16 flags)
3344 {
3345 struct nlmsghdr *nlh;
3346 u8 scope = RT_SCOPE_UNIVERSE;
3347 int ifindex = ifmca->idev->dev->ifindex;
3348
3349 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3350 scope = RT_SCOPE_SITE;
3351
3352 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3353 if (nlh == NULL)
3354 return -EMSGSIZE;
3355
3356 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3357 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3358 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3359 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3360 nlmsg_cancel(skb, nlh);
3361 return -EMSGSIZE;
3362 }
3363
3364 return nlmsg_end(skb, nlh);
3365 }
3366
3367 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3368 u32 pid, u32 seq, int event, unsigned int flags)
3369 {
3370 struct nlmsghdr *nlh;
3371 u8 scope = RT_SCOPE_UNIVERSE;
3372 int ifindex = ifaca->aca_idev->dev->ifindex;
3373
3374 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3375 scope = RT_SCOPE_SITE;
3376
3377 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3378 if (nlh == NULL)
3379 return -EMSGSIZE;
3380
3381 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3382 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3383 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3384 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3385 nlmsg_cancel(skb, nlh);
3386 return -EMSGSIZE;
3387 }
3388
3389 return nlmsg_end(skb, nlh);
3390 }
3391
3392 enum addr_type_t
3393 {
3394 UNICAST_ADDR,
3395 MULTICAST_ADDR,
3396 ANYCAST_ADDR,
3397 };
3398
3399 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3400 enum addr_type_t type)
3401 {
3402 int idx, ip_idx;
3403 int s_idx, s_ip_idx;
3404 int err = 1;
3405 struct net_device *dev;
3406 struct inet6_dev *idev = NULL;
3407 struct inet6_ifaddr *ifa;
3408 struct ifmcaddr6 *ifmca;
3409 struct ifacaddr6 *ifaca;
3410 struct net *net = sock_net(skb->sk);
3411
3412 s_idx = cb->args[0];
3413 s_ip_idx = ip_idx = cb->args[1];
3414
3415 idx = 0;
3416 for_each_netdev(net, dev) {
3417 if (idx < s_idx)
3418 goto cont;
3419 if (idx > s_idx)
3420 s_ip_idx = 0;
3421 ip_idx = 0;
3422 if ((idev = in6_dev_get(dev)) == NULL)
3423 goto cont;
3424 read_lock_bh(&idev->lock);
3425 switch (type) {
3426 case UNICAST_ADDR:
3427 /* unicast address incl. temp addr */
3428 for (ifa = idev->addr_list; ifa;
3429 ifa = ifa->if_next, ip_idx++) {
3430 if (ip_idx < s_ip_idx)
3431 continue;
3432 err = inet6_fill_ifaddr(skb, ifa,
3433 NETLINK_CB(cb->skb).pid,
3434 cb->nlh->nlmsg_seq,
3435 RTM_NEWADDR,
3436 NLM_F_MULTI);
3437 }
3438 break;
3439 case MULTICAST_ADDR:
3440 /* multicast address */
3441 for (ifmca = idev->mc_list; ifmca;
3442 ifmca = ifmca->next, ip_idx++) {
3443 if (ip_idx < s_ip_idx)
3444 continue;
3445 err = inet6_fill_ifmcaddr(skb, ifmca,
3446 NETLINK_CB(cb->skb).pid,
3447 cb->nlh->nlmsg_seq,
3448 RTM_GETMULTICAST,
3449 NLM_F_MULTI);
3450 }
3451 break;
3452 case ANYCAST_ADDR:
3453 /* anycast address */
3454 for (ifaca = idev->ac_list; ifaca;
3455 ifaca = ifaca->aca_next, ip_idx++) {
3456 if (ip_idx < s_ip_idx)
3457 continue;
3458 err = inet6_fill_ifacaddr(skb, ifaca,
3459 NETLINK_CB(cb->skb).pid,
3460 cb->nlh->nlmsg_seq,
3461 RTM_GETANYCAST,
3462 NLM_F_MULTI);
3463 }
3464 break;
3465 default:
3466 break;
3467 }
3468 read_unlock_bh(&idev->lock);
3469 in6_dev_put(idev);
3470
3471 if (err <= 0)
3472 break;
3473 cont:
3474 idx++;
3475 }
3476 cb->args[0] = idx;
3477 cb->args[1] = ip_idx;
3478 return skb->len;
3479 }
3480
3481 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3482 {
3483 enum addr_type_t type = UNICAST_ADDR;
3484
3485 return inet6_dump_addr(skb, cb, type);
3486 }
3487
3488 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3489 {
3490 enum addr_type_t type = MULTICAST_ADDR;
3491
3492 return inet6_dump_addr(skb, cb, type);
3493 }
3494
3495
3496 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3497 {
3498 enum addr_type_t type = ANYCAST_ADDR;
3499
3500 return inet6_dump_addr(skb, cb, type);
3501 }
3502
3503 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3504 void *arg)
3505 {
3506 struct net *net = sock_net(in_skb->sk);
3507 struct ifaddrmsg *ifm;
3508 struct nlattr *tb[IFA_MAX+1];
3509 struct in6_addr *addr = NULL;
3510 struct net_device *dev = NULL;
3511 struct inet6_ifaddr *ifa;
3512 struct sk_buff *skb;
3513 int err;
3514
3515 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3516 if (err < 0)
3517 goto errout;
3518
3519 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3520 if (addr == NULL) {
3521 err = -EINVAL;
3522 goto errout;
3523 }
3524
3525 ifm = nlmsg_data(nlh);
3526 if (ifm->ifa_index)
3527 dev = __dev_get_by_index(net, ifm->ifa_index);
3528
3529 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3530 err = -EADDRNOTAVAIL;
3531 goto errout;
3532 }
3533
3534 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3535 err = -ENOBUFS;
3536 goto errout_ifa;
3537 }
3538
3539 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3540 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3541 if (err < 0) {
3542 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3543 WARN_ON(err == -EMSGSIZE);
3544 kfree_skb(skb);
3545 goto errout_ifa;
3546 }
3547 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3548 errout_ifa:
3549 in6_ifa_put(ifa);
3550 errout:
3551 return err;
3552 }
3553
3554 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3555 {
3556 struct sk_buff *skb;
3557 struct net *net = dev_net(ifa->idev->dev);
3558 int err = -ENOBUFS;
3559
3560 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3561 if (skb == NULL)
3562 goto errout;
3563
3564 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3565 if (err < 0) {
3566 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3567 WARN_ON(err == -EMSGSIZE);
3568 kfree_skb(skb);
3569 goto errout;
3570 }
3571 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3572 errout:
3573 if (err < 0)
3574 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3575 }
3576
3577 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3578 __s32 *array, int bytes)
3579 {
3580 BUG_ON(bytes < (DEVCONF_MAX * 4));
3581
3582 memset(array, 0, bytes);
3583 array[DEVCONF_FORWARDING] = cnf->forwarding;
3584 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3585 array[DEVCONF_MTU6] = cnf->mtu6;
3586 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3587 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3588 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3589 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3590 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3591 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3592 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3593 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3594 #ifdef CONFIG_IPV6_PRIVACY
3595 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3596 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3597 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3598 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3599 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3600 #endif
3601 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3602 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3603 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3604 #ifdef CONFIG_IPV6_ROUTER_PREF
3605 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3606 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3607 #ifdef CONFIG_IPV6_ROUTE_INFO
3608 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3609 #endif
3610 #endif
3611 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3612 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3613 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3614 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3615 #endif
3616 #ifdef CONFIG_IPV6_MROUTE
3617 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3618 #endif
3619 }
3620
3621 static inline size_t inet6_if_nlmsg_size(void)
3622 {
3623 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3624 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3625 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3626 + nla_total_size(4) /* IFLA_MTU */
3627 + nla_total_size(4) /* IFLA_LINK */
3628 + nla_total_size( /* IFLA_PROTINFO */
3629 nla_total_size(4) /* IFLA_INET6_FLAGS */
3630 + nla_total_size(sizeof(struct ifla_cacheinfo))
3631 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3632 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3633 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3634 );
3635 }
3636
3637 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3638 int bytes)
3639 {
3640 int i;
3641 int pad = bytes - sizeof(u64) * items;
3642 BUG_ON(pad < 0);
3643
3644 /* Use put_unaligned() because stats may not be aligned for u64. */
3645 put_unaligned(items, &stats[0]);
3646 for (i = 1; i < items; i++)
3647 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3648
3649 memset(&stats[items], 0, pad);
3650 }
3651
3652 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3653 int bytes)
3654 {
3655 switch(attrtype) {
3656 case IFLA_INET6_STATS:
3657 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3658 break;
3659 case IFLA_INET6_ICMP6STATS:
3660 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3661 break;
3662 }
3663 }
3664
3665 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3666 u32 pid, u32 seq, int event, unsigned int flags)
3667 {
3668 struct net_device *dev = idev->dev;
3669 struct nlattr *nla;
3670 struct ifinfomsg *hdr;
3671 struct nlmsghdr *nlh;
3672 void *protoinfo;
3673 struct ifla_cacheinfo ci;
3674
3675 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3676 if (nlh == NULL)
3677 return -EMSGSIZE;
3678
3679 hdr = nlmsg_data(nlh);
3680 hdr->ifi_family = AF_INET6;
3681 hdr->__ifi_pad = 0;
3682 hdr->ifi_type = dev->type;
3683 hdr->ifi_index = dev->ifindex;
3684 hdr->ifi_flags = dev_get_flags(dev);
3685 hdr->ifi_change = 0;
3686
3687 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3688
3689 if (dev->addr_len)
3690 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3691
3692 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3693 if (dev->ifindex != dev->iflink)
3694 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3695
3696 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3697 if (protoinfo == NULL)
3698 goto nla_put_failure;
3699
3700 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3701
3702 ci.max_reasm_len = IPV6_MAXPLEN;
3703 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3704 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3705 ci.reachable_time = idev->nd_parms->reachable_time;
3706 ci.retrans_time = idev->nd_parms->retrans_time;
3707 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3708
3709 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3710 if (nla == NULL)
3711 goto nla_put_failure;
3712 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3713
3714 /* XXX - MC not implemented */
3715
3716 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3717 if (nla == NULL)
3718 goto nla_put_failure;
3719 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3720
3721 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3722 if (nla == NULL)
3723 goto nla_put_failure;
3724 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3725
3726 nla_nest_end(skb, protoinfo);
3727 return nlmsg_end(skb, nlh);
3728
3729 nla_put_failure:
3730 nlmsg_cancel(skb, nlh);
3731 return -EMSGSIZE;
3732 }
3733
3734 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3735 {
3736 struct net *net = sock_net(skb->sk);
3737 int idx, err;
3738 int s_idx = cb->args[0];
3739 struct net_device *dev;
3740 struct inet6_dev *idev;
3741
3742 read_lock(&dev_base_lock);
3743 idx = 0;
3744 for_each_netdev(net, dev) {
3745 if (idx < s_idx)
3746 goto cont;
3747 if ((idev = in6_dev_get(dev)) == NULL)
3748 goto cont;
3749 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3750 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3751 in6_dev_put(idev);
3752 if (err <= 0)
3753 break;
3754 cont:
3755 idx++;
3756 }
3757 read_unlock(&dev_base_lock);
3758 cb->args[0] = idx;
3759
3760 return skb->len;
3761 }
3762
3763 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3764 {
3765 struct sk_buff *skb;
3766 struct net *net = dev_net(idev->dev);
3767 int err = -ENOBUFS;
3768
3769 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3770 if (skb == NULL)
3771 goto errout;
3772
3773 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3774 if (err < 0) {
3775 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3776 WARN_ON(err == -EMSGSIZE);
3777 kfree_skb(skb);
3778 goto errout;
3779 }
3780 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3781 errout:
3782 if (err < 0)
3783 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3784 }
3785
3786 static inline size_t inet6_prefix_nlmsg_size(void)
3787 {
3788 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3789 + nla_total_size(sizeof(struct in6_addr))
3790 + nla_total_size(sizeof(struct prefix_cacheinfo));
3791 }
3792
3793 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3794 struct prefix_info *pinfo, u32 pid, u32 seq,
3795 int event, unsigned int flags)
3796 {
3797 struct prefixmsg *pmsg;
3798 struct nlmsghdr *nlh;
3799 struct prefix_cacheinfo ci;
3800
3801 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3802 if (nlh == NULL)
3803 return -EMSGSIZE;
3804
3805 pmsg = nlmsg_data(nlh);
3806 pmsg->prefix_family = AF_INET6;
3807 pmsg->prefix_pad1 = 0;
3808 pmsg->prefix_pad2 = 0;
3809 pmsg->prefix_ifindex = idev->dev->ifindex;
3810 pmsg->prefix_len = pinfo->prefix_len;
3811 pmsg->prefix_type = pinfo->type;
3812 pmsg->prefix_pad3 = 0;
3813 pmsg->prefix_flags = 0;
3814 if (pinfo->onlink)
3815 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3816 if (pinfo->autoconf)
3817 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3818
3819 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3820
3821 ci.preferred_time = ntohl(pinfo->prefered);
3822 ci.valid_time = ntohl(pinfo->valid);
3823 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3824
3825 return nlmsg_end(skb, nlh);
3826
3827 nla_put_failure:
3828 nlmsg_cancel(skb, nlh);
3829 return -EMSGSIZE;
3830 }
3831
3832 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3833 struct prefix_info *pinfo)
3834 {
3835 struct sk_buff *skb;
3836 struct net *net = dev_net(idev->dev);
3837 int err = -ENOBUFS;
3838
3839 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3840 if (skb == NULL)
3841 goto errout;
3842
3843 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3844 if (err < 0) {
3845 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3846 WARN_ON(err == -EMSGSIZE);
3847 kfree_skb(skb);
3848 goto errout;
3849 }
3850 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3851 errout:
3852 if (err < 0)
3853 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3854 }
3855
3856 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3857 {
3858 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3859
3860 switch (event) {
3861 case RTM_NEWADDR:
3862 /*
3863 * If the address was optimistic
3864 * we inserted the route at the start of
3865 * our DAD process, so we don't need
3866 * to do it again
3867 */
3868 if (!(ifp->rt->rt6i_node))
3869 ip6_ins_rt(ifp->rt);
3870 if (ifp->idev->cnf.forwarding)
3871 addrconf_join_anycast(ifp);
3872 break;
3873 case RTM_DELADDR:
3874 if (ifp->idev->cnf.forwarding)
3875 addrconf_leave_anycast(ifp);
3876 addrconf_leave_solict(ifp->idev, &ifp->addr);
3877 dst_hold(&ifp->rt->u.dst);
3878 if (ip6_del_rt(ifp->rt))
3879 dst_free(&ifp->rt->u.dst);
3880 break;
3881 }
3882 }
3883
3884 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3885 {
3886 rcu_read_lock_bh();
3887 if (likely(ifp->idev->dead == 0))
3888 __ipv6_ifa_notify(event, ifp);
3889 rcu_read_unlock_bh();
3890 }
3891
3892 #ifdef CONFIG_SYSCTL
3893
3894 static
3895 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3896 void __user *buffer, size_t *lenp, loff_t *ppos)
3897 {
3898 int *valp = ctl->data;
3899 int val = *valp;
3900 int ret;
3901
3902 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3903
3904 if (write)
3905 addrconf_fixup_forwarding(ctl, valp, val);
3906 return ret;
3907 }
3908
3909 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3910 int __user *name, int nlen,
3911 void __user *oldval,
3912 size_t __user *oldlenp,
3913 void __user *newval, size_t newlen)
3914 {
3915 int *valp = table->data;
3916 int val = *valp;
3917 int new;
3918
3919 if (!newval || !newlen)
3920 return 0;
3921 if (newlen != sizeof(int))
3922 return -EINVAL;
3923 if (get_user(new, (int __user *)newval))
3924 return -EFAULT;
3925 if (new == *valp)
3926 return 0;
3927 if (oldval && oldlenp) {
3928 size_t len;
3929 if (get_user(len, oldlenp))
3930 return -EFAULT;
3931 if (len) {
3932 if (len > table->maxlen)
3933 len = table->maxlen;
3934 if (copy_to_user(oldval, valp, len))
3935 return -EFAULT;
3936 if (put_user(len, oldlenp))
3937 return -EFAULT;
3938 }
3939 }
3940
3941 *valp = new;
3942 addrconf_fixup_forwarding(table, valp, val);
3943 return 1;
3944 }
3945
3946 static struct addrconf_sysctl_table
3947 {
3948 struct ctl_table_header *sysctl_header;
3949 ctl_table addrconf_vars[DEVCONF_MAX+1];
3950 char *dev_name;
3951 } addrconf_sysctl __read_mostly = {
3952 .sysctl_header = NULL,
3953 .addrconf_vars = {
3954 {
3955 .ctl_name = NET_IPV6_FORWARDING,
3956 .procname = "forwarding",
3957 .data = &ipv6_devconf.forwarding,
3958 .maxlen = sizeof(int),
3959 .mode = 0644,
3960 .proc_handler = &addrconf_sysctl_forward,
3961 .strategy = &addrconf_sysctl_forward_strategy,
3962 },
3963 {
3964 .ctl_name = NET_IPV6_HOP_LIMIT,
3965 .procname = "hop_limit",
3966 .data = &ipv6_devconf.hop_limit,
3967 .maxlen = sizeof(int),
3968 .mode = 0644,
3969 .proc_handler = proc_dointvec,
3970 },
3971 {
3972 .ctl_name = NET_IPV6_MTU,
3973 .procname = "mtu",
3974 .data = &ipv6_devconf.mtu6,
3975 .maxlen = sizeof(int),
3976 .mode = 0644,
3977 .proc_handler = &proc_dointvec,
3978 },
3979 {
3980 .ctl_name = NET_IPV6_ACCEPT_RA,
3981 .procname = "accept_ra",
3982 .data = &ipv6_devconf.accept_ra,
3983 .maxlen = sizeof(int),
3984 .mode = 0644,
3985 .proc_handler = &proc_dointvec,
3986 },
3987 {
3988 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3989 .procname = "accept_redirects",
3990 .data = &ipv6_devconf.accept_redirects,
3991 .maxlen = sizeof(int),
3992 .mode = 0644,
3993 .proc_handler = &proc_dointvec,
3994 },
3995 {
3996 .ctl_name = NET_IPV6_AUTOCONF,
3997 .procname = "autoconf",
3998 .data = &ipv6_devconf.autoconf,
3999 .maxlen = sizeof(int),
4000 .mode = 0644,
4001 .proc_handler = &proc_dointvec,
4002 },
4003 {
4004 .ctl_name = NET_IPV6_DAD_TRANSMITS,
4005 .procname = "dad_transmits",
4006 .data = &ipv6_devconf.dad_transmits,
4007 .maxlen = sizeof(int),
4008 .mode = 0644,
4009 .proc_handler = &proc_dointvec,
4010 },
4011 {
4012 .ctl_name = NET_IPV6_RTR_SOLICITS,
4013 .procname = "router_solicitations",
4014 .data = &ipv6_devconf.rtr_solicits,
4015 .maxlen = sizeof(int),
4016 .mode = 0644,
4017 .proc_handler = &proc_dointvec,
4018 },
4019 {
4020 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
4021 .procname = "router_solicitation_interval",
4022 .data = &ipv6_devconf.rtr_solicit_interval,
4023 .maxlen = sizeof(int),
4024 .mode = 0644,
4025 .proc_handler = &proc_dointvec_jiffies,
4026 .strategy = &sysctl_jiffies,
4027 },
4028 {
4029 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
4030 .procname = "router_solicitation_delay",
4031 .data = &ipv6_devconf.rtr_solicit_delay,
4032 .maxlen = sizeof(int),
4033 .mode = 0644,
4034 .proc_handler = &proc_dointvec_jiffies,
4035 .strategy = &sysctl_jiffies,
4036 },
4037 {
4038 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
4039 .procname = "force_mld_version",
4040 .data = &ipv6_devconf.force_mld_version,
4041 .maxlen = sizeof(int),
4042 .mode = 0644,
4043 .proc_handler = &proc_dointvec,
4044 },
4045 #ifdef CONFIG_IPV6_PRIVACY
4046 {
4047 .ctl_name = NET_IPV6_USE_TEMPADDR,
4048 .procname = "use_tempaddr",
4049 .data = &ipv6_devconf.use_tempaddr,
4050 .maxlen = sizeof(int),
4051 .mode = 0644,
4052 .proc_handler = &proc_dointvec,
4053 },
4054 {
4055 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
4056 .procname = "temp_valid_lft",
4057 .data = &ipv6_devconf.temp_valid_lft,
4058 .maxlen = sizeof(int),
4059 .mode = 0644,
4060 .proc_handler = &proc_dointvec,
4061 },
4062 {
4063 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4064 .procname = "temp_prefered_lft",
4065 .data = &ipv6_devconf.temp_prefered_lft,
4066 .maxlen = sizeof(int),
4067 .mode = 0644,
4068 .proc_handler = &proc_dointvec,
4069 },
4070 {
4071 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4072 .procname = "regen_max_retry",
4073 .data = &ipv6_devconf.regen_max_retry,
4074 .maxlen = sizeof(int),
4075 .mode = 0644,
4076 .proc_handler = &proc_dointvec,
4077 },
4078 {
4079 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4080 .procname = "max_desync_factor",
4081 .data = &ipv6_devconf.max_desync_factor,
4082 .maxlen = sizeof(int),
4083 .mode = 0644,
4084 .proc_handler = &proc_dointvec,
4085 },
4086 #endif
4087 {
4088 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4089 .procname = "max_addresses",
4090 .data = &ipv6_devconf.max_addresses,
4091 .maxlen = sizeof(int),
4092 .mode = 0644,
4093 .proc_handler = &proc_dointvec,
4094 },
4095 {
4096 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4097 .procname = "accept_ra_defrtr",
4098 .data = &ipv6_devconf.accept_ra_defrtr,
4099 .maxlen = sizeof(int),
4100 .mode = 0644,
4101 .proc_handler = &proc_dointvec,
4102 },
4103 {
4104 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4105 .procname = "accept_ra_pinfo",
4106 .data = &ipv6_devconf.accept_ra_pinfo,
4107 .maxlen = sizeof(int),
4108 .mode = 0644,
4109 .proc_handler = &proc_dointvec,
4110 },
4111 #ifdef CONFIG_IPV6_ROUTER_PREF
4112 {
4113 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4114 .procname = "accept_ra_rtr_pref",
4115 .data = &ipv6_devconf.accept_ra_rtr_pref,
4116 .maxlen = sizeof(int),
4117 .mode = 0644,
4118 .proc_handler = &proc_dointvec,
4119 },
4120 {
4121 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4122 .procname = "router_probe_interval",
4123 .data = &ipv6_devconf.rtr_probe_interval,
4124 .maxlen = sizeof(int),
4125 .mode = 0644,
4126 .proc_handler = &proc_dointvec_jiffies,
4127 .strategy = &sysctl_jiffies,
4128 },
4129 #ifdef CONFIG_IPV6_ROUTE_INFO
4130 {
4131 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4132 .procname = "accept_ra_rt_info_max_plen",
4133 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4134 .maxlen = sizeof(int),
4135 .mode = 0644,
4136 .proc_handler = &proc_dointvec,
4137 },
4138 #endif
4139 #endif
4140 {
4141 .ctl_name = NET_IPV6_PROXY_NDP,
4142 .procname = "proxy_ndp",
4143 .data = &ipv6_devconf.proxy_ndp,
4144 .maxlen = sizeof(int),
4145 .mode = 0644,
4146 .proc_handler = &proc_dointvec,
4147 },
4148 {
4149 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4150 .procname = "accept_source_route",
4151 .data = &ipv6_devconf.accept_source_route,
4152 .maxlen = sizeof(int),
4153 .mode = 0644,
4154 .proc_handler = &proc_dointvec,
4155 },
4156 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4157 {
4158 .ctl_name = CTL_UNNUMBERED,
4159 .procname = "optimistic_dad",
4160 .data = &ipv6_devconf.optimistic_dad,
4161 .maxlen = sizeof(int),
4162 .mode = 0644,
4163 .proc_handler = &proc_dointvec,
4164
4165 },
4166 #endif
4167 #ifdef CONFIG_IPV6_MROUTE
4168 {
4169 .ctl_name = CTL_UNNUMBERED,
4170 .procname = "mc_forwarding",
4171 .data = &ipv6_devconf.mc_forwarding,
4172 .maxlen = sizeof(int),
4173 .mode = 0644,
4174 .proc_handler = &proc_dointvec,
4175 },
4176 #endif
4177 {
4178 .ctl_name = 0, /* sentinel */
4179 }
4180 },
4181 };
4182
4183 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4184 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4185 {
4186 int i;
4187 struct addrconf_sysctl_table *t;
4188
4189 #define ADDRCONF_CTL_PATH_DEV 3
4190
4191 struct ctl_path addrconf_ctl_path[] = {
4192 { .procname = "net", .ctl_name = CTL_NET, },
4193 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4194 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4195 { /* to be set */ },
4196 { },
4197 };
4198
4199
4200 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4201 if (t == NULL)
4202 goto out;
4203
4204 for (i=0; t->addrconf_vars[i].data; i++) {
4205 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4206 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4207 t->addrconf_vars[i].extra2 = net;
4208 }
4209
4210 /*
4211 * Make a copy of dev_name, because '.procname' is regarded as const
4212 * by sysctl and we wouldn't want anyone to change it under our feet
4213 * (see SIOCSIFNAME).
4214 */
4215 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4216 if (!t->dev_name)
4217 goto free;
4218
4219 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4220 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4221
4222 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4223 t->addrconf_vars);
4224 if (t->sysctl_header == NULL)
4225 goto free_procname;
4226
4227 p->sysctl = t;
4228 return 0;
4229
4230 free_procname:
4231 kfree(t->dev_name);
4232 free:
4233 kfree(t);
4234 out:
4235 return -ENOBUFS;
4236 }
4237
4238 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4239 {
4240 struct addrconf_sysctl_table *t;
4241
4242 if (p->sysctl == NULL)
4243 return;
4244
4245 t = p->sysctl;
4246 p->sysctl = NULL;
4247 unregister_sysctl_table(t->sysctl_header);
4248 kfree(t->dev_name);
4249 kfree(t);
4250 }
4251
4252 static void addrconf_sysctl_register(struct inet6_dev *idev)
4253 {
4254 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4255 NET_IPV6_NEIGH, "ipv6",
4256 &ndisc_ifinfo_sysctl_change,
4257 NULL);
4258 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4259 idev->dev->ifindex, idev, &idev->cnf);
4260 }
4261
4262 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4263 {
4264 __addrconf_sysctl_unregister(&idev->cnf);
4265 neigh_sysctl_unregister(idev->nd_parms);
4266 }
4267
4268
4269 #endif
4270
4271 static int addrconf_init_net(struct net *net)
4272 {
4273 int err;
4274 struct ipv6_devconf *all, *dflt;
4275
4276 err = -ENOMEM;
4277 all = &ipv6_devconf;
4278 dflt = &ipv6_devconf_dflt;
4279
4280 if (net != &init_net) {
4281 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4282 if (all == NULL)
4283 goto err_alloc_all;
4284
4285 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4286 if (dflt == NULL)
4287 goto err_alloc_dflt;
4288 }
4289
4290 net->ipv6.devconf_all = all;
4291 net->ipv6.devconf_dflt = dflt;
4292
4293 #ifdef CONFIG_SYSCTL
4294 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4295 NULL, all);
4296 if (err < 0)
4297 goto err_reg_all;
4298
4299 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4300 NULL, dflt);
4301 if (err < 0)
4302 goto err_reg_dflt;
4303 #endif
4304 return 0;
4305
4306 #ifdef CONFIG_SYSCTL
4307 err_reg_dflt:
4308 __addrconf_sysctl_unregister(all);
4309 err_reg_all:
4310 kfree(dflt);
4311 #endif
4312 err_alloc_dflt:
4313 kfree(all);
4314 err_alloc_all:
4315 return err;
4316 }
4317
4318 static void addrconf_exit_net(struct net *net)
4319 {
4320 #ifdef CONFIG_SYSCTL
4321 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4322 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4323 #endif
4324 if (net != &init_net) {
4325 kfree(net->ipv6.devconf_dflt);
4326 kfree(net->ipv6.devconf_all);
4327 }
4328 }
4329
4330 static struct pernet_operations addrconf_ops = {
4331 .init = addrconf_init_net,
4332 .exit = addrconf_exit_net,
4333 };
4334
4335 /*
4336 * Device notifier
4337 */
4338
4339 int register_inet6addr_notifier(struct notifier_block *nb)
4340 {
4341 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4342 }
4343
4344 EXPORT_SYMBOL(register_inet6addr_notifier);
4345
4346 int unregister_inet6addr_notifier(struct notifier_block *nb)
4347 {
4348 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4349 }
4350
4351 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4352
4353
4354 static int addrconf_net_init(struct net *net)
4355 {
4356 return 0;
4357 }
4358
4359 static void addrconf_net_exit(struct net *net)
4360 {
4361 struct net_device *dev;
4362
4363 rtnl_lock();
4364 /* clean dev list */
4365 for_each_netdev(net, dev) {
4366 if (__in6_dev_get(dev) == NULL)
4367 continue;
4368 addrconf_ifdown(dev, 1);
4369 }
4370 addrconf_ifdown(net->loopback_dev, 2);
4371 rtnl_unlock();
4372 }
4373
4374 static struct pernet_operations addrconf_net_ops = {
4375 .init = addrconf_net_init,
4376 .exit = addrconf_net_exit,
4377 };
4378
4379 /*
4380 * Init / cleanup code
4381 */
4382
4383 int __init addrconf_init(void)
4384 {
4385 int err;
4386
4387 if ((err = ipv6_addr_label_init()) < 0) {
4388 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4389 err);
4390 return err;
4391 }
4392
4393 register_pernet_subsys(&addrconf_ops);
4394
4395 /* The addrconf netdev notifier requires that loopback_dev
4396 * has it's ipv6 private information allocated and setup
4397 * before it can bring up and give link-local addresses
4398 * to other devices which are up.
4399 *
4400 * Unfortunately, loopback_dev is not necessarily the first
4401 * entry in the global dev_base list of net devices. In fact,
4402 * it is likely to be the very last entry on that list.
4403 * So this causes the notifier registry below to try and
4404 * give link-local addresses to all devices besides loopback_dev
4405 * first, then loopback_dev, which cases all the non-loopback_dev
4406 * devices to fail to get a link-local address.
4407 *
4408 * So, as a temporary fix, allocate the ipv6 structure for
4409 * loopback_dev first by hand.
4410 * Longer term, all of the dependencies ipv6 has upon the loopback
4411 * device and it being up should be removed.
4412 */
4413 rtnl_lock();
4414 if (!ipv6_add_dev(init_net.loopback_dev))
4415 err = -ENOMEM;
4416 rtnl_unlock();
4417 if (err)
4418 goto errlo;
4419
4420 err = register_pernet_device(&addrconf_net_ops);
4421 if (err)
4422 return err;
4423
4424 register_netdevice_notifier(&ipv6_dev_notf);
4425
4426 addrconf_verify(0);
4427
4428 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4429 if (err < 0)
4430 goto errout;
4431
4432 /* Only the first call to __rtnl_register can fail */
4433 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4434 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4435 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4436 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4437 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4438
4439 ipv6_addr_label_rtnl_register();
4440
4441 return 0;
4442 errout:
4443 unregister_netdevice_notifier(&ipv6_dev_notf);
4444 errlo:
4445 unregister_pernet_subsys(&addrconf_ops);
4446
4447 return err;
4448 }
4449
4450 void addrconf_cleanup(void)
4451 {
4452 struct inet6_ifaddr *ifa;
4453 int i;
4454
4455 unregister_netdevice_notifier(&ipv6_dev_notf);
4456 unregister_pernet_device(&addrconf_net_ops);
4457
4458 unregister_pernet_subsys(&addrconf_ops);
4459
4460 rtnl_lock();
4461
4462 /*
4463 * Check hash table.
4464 */
4465 write_lock_bh(&addrconf_hash_lock);
4466 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4467 for (ifa=inet6_addr_lst[i]; ifa; ) {
4468 struct inet6_ifaddr *bifa;
4469
4470 bifa = ifa;
4471 ifa = ifa->lst_next;
4472 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4473 /* Do not free it; something is wrong.
4474 Now we can investigate it with debugger.
4475 */
4476 }
4477 }
4478 write_unlock_bh(&addrconf_hash_lock);
4479
4480 del_timer(&addr_chk_timer);
4481 rtnl_unlock();
4482
4483 unregister_pernet_subsys(&addrconf_net_ops);
4484 }
ubuntu-bionic-kernel mirror