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pidns: make pid->level and pid_ns->level unsigned
[linux-2.6/kvm.git] / net / ipv6 / addrconf.c
blobe591e09e5e4e21ed8db7ab0eee75a3ce27813ffe
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 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
226 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
227
228 /* Check if a valid qdisc is available */
229 static inline int addrconf_qdisc_ok(struct net_device *dev)
230 {
231 return (dev->qdisc != &noop_qdisc);
232 }
233
234 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
235 {
236 if (del_timer(&ifp->timer))
237 __in6_ifa_put(ifp);
238 }
239
240 enum addrconf_timer_t
241 {
242 AC_NONE,
243 AC_DAD,
244 AC_RS,
245 };
246
247 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
248 enum addrconf_timer_t what,
249 unsigned long when)
250 {
251 if (!del_timer(&ifp->timer))
252 in6_ifa_hold(ifp);
253
254 switch (what) {
255 case AC_DAD:
256 ifp->timer.function = addrconf_dad_timer;
257 break;
258 case AC_RS:
259 ifp->timer.function = addrconf_rs_timer;
260 break;
261 default:;
262 }
263 ifp->timer.expires = jiffies + when;
264 add_timer(&ifp->timer);
265 }
266
267 static int snmp6_alloc_dev(struct inet6_dev *idev)
268 {
269 if (snmp_mib_init((void **)idev->stats.ipv6,
270 sizeof(struct ipstats_mib)) < 0)
271 goto err_ip;
272 if (snmp_mib_init((void **)idev->stats.icmpv6,
273 sizeof(struct icmpv6_mib)) < 0)
274 goto err_icmp;
275 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
276 sizeof(struct icmpv6msg_mib)) < 0)
277 goto err_icmpmsg;
278
279 return 0;
280
281 err_icmpmsg:
282 snmp_mib_free((void **)idev->stats.icmpv6);
283 err_icmp:
284 snmp_mib_free((void **)idev->stats.ipv6);
285 err_ip:
286 return -ENOMEM;
287 }
288
289 static void snmp6_free_dev(struct inet6_dev *idev)
290 {
291 snmp_mib_free((void **)idev->stats.icmpv6msg);
292 snmp_mib_free((void **)idev->stats.icmpv6);
293 snmp_mib_free((void **)idev->stats.ipv6);
294 }
295
296 /* Nobody refers to this device, we may destroy it. */
297
298 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
299 {
300 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
301 kfree(idev);
302 }
303
304 void in6_dev_finish_destroy(struct inet6_dev *idev)
305 {
306 struct net_device *dev = idev->dev;
307 BUG_TRAP(idev->addr_list==NULL);
308 BUG_TRAP(idev->mc_list==NULL);
309 #ifdef NET_REFCNT_DEBUG
310 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
311 #endif
312 dev_put(dev);
313 if (!idev->dead) {
314 printk("Freeing alive inet6 device %p\n", idev);
315 return;
316 }
317 snmp6_free_dev(idev);
318 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
319 }
320
321 EXPORT_SYMBOL(in6_dev_finish_destroy);
322
323 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
324 {
325 struct inet6_dev *ndev;
326
327 ASSERT_RTNL();
328
329 if (dev->mtu < IPV6_MIN_MTU)
330 return NULL;
331
332 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
333
334 if (ndev == NULL)
335 return NULL;
336
337 rwlock_init(&ndev->lock);
338 ndev->dev = dev;
339 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
340 ndev->cnf.mtu6 = dev->mtu;
341 ndev->cnf.sysctl = NULL;
342 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
343 if (ndev->nd_parms == NULL) {
344 kfree(ndev);
345 return NULL;
346 }
347 /* We refer to the device */
348 dev_hold(dev);
349
350 if (snmp6_alloc_dev(ndev) < 0) {
351 ADBG((KERN_WARNING
352 "%s(): cannot allocate memory for statistics; dev=%s.\n",
353 __func__, dev->name));
354 neigh_parms_release(&nd_tbl, ndev->nd_parms);
355 ndev->dead = 1;
356 in6_dev_finish_destroy(ndev);
357 return NULL;
358 }
359
360 if (snmp6_register_dev(ndev) < 0) {
361 ADBG((KERN_WARNING
362 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
363 __func__, dev->name));
364 neigh_parms_release(&nd_tbl, ndev->nd_parms);
365 ndev->dead = 1;
366 in6_dev_finish_destroy(ndev);
367 return NULL;
368 }
369
370 /* One reference from device. We must do this before
371 * we invoke __ipv6_regen_rndid().
372 */
373 in6_dev_hold(ndev);
374
375 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
376 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
377 printk(KERN_INFO
378 "%s: Disabled Multicast RS\n",
379 dev->name);
380 ndev->cnf.rtr_solicits = 0;
381 }
382 #endif
383
384 #ifdef CONFIG_IPV6_PRIVACY
385 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
386 if ((dev->flags&IFF_LOOPBACK) ||
387 dev->type == ARPHRD_TUNNEL ||
388 dev->type == ARPHRD_TUNNEL6 ||
389 dev->type == ARPHRD_SIT ||
390 dev->type == ARPHRD_NONE) {
391 printk(KERN_INFO
392 "%s: Disabled Privacy Extensions\n",
393 dev->name);
394 ndev->cnf.use_tempaddr = -1;
395 } else {
396 in6_dev_hold(ndev);
397 ipv6_regen_rndid((unsigned long) ndev);
398 }
399 #endif
400
401 if (netif_running(dev) && addrconf_qdisc_ok(dev))
402 ndev->if_flags |= IF_READY;
403
404 ipv6_mc_init_dev(ndev);
405 ndev->tstamp = jiffies;
406 addrconf_sysctl_register(ndev);
407 /* protected by rtnl_lock */
408 rcu_assign_pointer(dev->ip6_ptr, ndev);
409
410 /* Join all-node multicast group */
411 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
412
413 return ndev;
414 }
415
416 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
417 {
418 struct inet6_dev *idev;
419
420 ASSERT_RTNL();
421
422 if ((idev = __in6_dev_get(dev)) == NULL) {
423 if ((idev = ipv6_add_dev(dev)) == NULL)
424 return NULL;
425 }
426
427 if (dev->flags&IFF_UP)
428 ipv6_mc_up(idev);
429 return idev;
430 }
431
432 #ifdef CONFIG_SYSCTL
433 static void dev_forward_change(struct inet6_dev *idev)
434 {
435 struct net_device *dev;
436 struct inet6_ifaddr *ifa;
437
438 if (!idev)
439 return;
440 dev = idev->dev;
441 if (dev && (dev->flags & IFF_MULTICAST)) {
442 if (idev->cnf.forwarding)
443 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
444 else
445 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
446 }
447 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
448 if (ifa->flags&IFA_F_TENTATIVE)
449 continue;
450 if (idev->cnf.forwarding)
451 addrconf_join_anycast(ifa);
452 else
453 addrconf_leave_anycast(ifa);
454 }
455 }
456
457
458 static void addrconf_forward_change(struct net *net, __s32 newf)
459 {
460 struct net_device *dev;
461 struct inet6_dev *idev;
462
463 read_lock(&dev_base_lock);
464 for_each_netdev(net, dev) {
465 rcu_read_lock();
466 idev = __in6_dev_get(dev);
467 if (idev) {
468 int changed = (!idev->cnf.forwarding) ^ (!newf);
469 idev->cnf.forwarding = newf;
470 if (changed)
471 dev_forward_change(idev);
472 }
473 rcu_read_unlock();
474 }
475 read_unlock(&dev_base_lock);
476 }
477
478 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
479 {
480 struct net *net;
481
482 net = (struct net *)table->extra2;
483 if (p == &net->ipv6.devconf_dflt->forwarding)
484 return;
485
486 if (p == &net->ipv6.devconf_all->forwarding) {
487 __s32 newf = net->ipv6.devconf_all->forwarding;
488 net->ipv6.devconf_dflt->forwarding = newf;
489 addrconf_forward_change(net, newf);
490 } else if ((!*p) ^ (!old))
491 dev_forward_change((struct inet6_dev *)table->extra1);
492
493 if (*p)
494 rt6_purge_dflt_routers(net);
495 }
496 #endif
497
498 /* Nobody refers to this ifaddr, destroy it */
499
500 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
501 {
502 BUG_TRAP(ifp->if_next==NULL);
503 BUG_TRAP(ifp->lst_next==NULL);
504 #ifdef NET_REFCNT_DEBUG
505 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
506 #endif
507
508 in6_dev_put(ifp->idev);
509
510 if (del_timer(&ifp->timer))
511 printk("Timer is still running, when freeing ifa=%p\n", ifp);
512
513 if (!ifp->dead) {
514 printk("Freeing alive inet6 address %p\n", ifp);
515 return;
516 }
517 dst_release(&ifp->rt->u.dst);
518
519 kfree(ifp);
520 }
521
522 static void
523 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
524 {
525 struct inet6_ifaddr *ifa, **ifap;
526 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
527
528 /*
529 * Each device address list is sorted in order of scope -
530 * global before linklocal.
531 */
532 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
533 ifap = &ifa->if_next) {
534 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
535 break;
536 }
537
538 ifp->if_next = *ifap;
539 *ifap = ifp;
540 }
541
542 /*
543 * Hash function taken from net_alias.c
544 */
545 static u8 ipv6_addr_hash(const struct in6_addr *addr)
546 {
547 __u32 word;
548
549 /*
550 * We perform the hash function over the last 64 bits of the address
551 * This will include the IEEE address token on links that support it.
552 */
553
554 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
555 word ^= (word >> 16);
556 word ^= (word >> 8);
557
558 return ((word ^ (word >> 4)) & 0x0f);
559 }
560
561 /* On success it returns ifp with increased reference count */
562
563 static struct inet6_ifaddr *
564 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
565 int scope, u32 flags)
566 {
567 struct inet6_ifaddr *ifa = NULL;
568 struct rt6_info *rt;
569 int hash;
570 int err = 0;
571
572 rcu_read_lock_bh();
573 if (idev->dead) {
574 err = -ENODEV; /*XXX*/
575 goto out2;
576 }
577
578 write_lock(&addrconf_hash_lock);
579
580 /* Ignore adding duplicate addresses on an interface */
581 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
582 ADBG(("ipv6_add_addr: already assigned\n"));
583 err = -EEXIST;
584 goto out;
585 }
586
587 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
588
589 if (ifa == NULL) {
590 ADBG(("ipv6_add_addr: malloc failed\n"));
591 err = -ENOBUFS;
592 goto out;
593 }
594
595 rt = addrconf_dst_alloc(idev, addr, 0);
596 if (IS_ERR(rt)) {
597 err = PTR_ERR(rt);
598 goto out;
599 }
600
601 ipv6_addr_copy(&ifa->addr, addr);
602
603 spin_lock_init(&ifa->lock);
604 init_timer(&ifa->timer);
605 ifa->timer.data = (unsigned long) ifa;
606 ifa->scope = scope;
607 ifa->prefix_len = pfxlen;
608 ifa->flags = flags | IFA_F_TENTATIVE;
609 ifa->cstamp = ifa->tstamp = jiffies;
610
611 ifa->rt = rt;
612
613 /*
614 * part one of RFC 4429, section 3.3
615 * We should not configure an address as
616 * optimistic if we do not yet know the link
617 * layer address of our nexhop router
618 */
619
620 if (rt->rt6i_nexthop == NULL)
621 ifa->flags &= ~IFA_F_OPTIMISTIC;
622
623 ifa->idev = idev;
624 in6_dev_hold(idev);
625 /* For caller */
626 in6_ifa_hold(ifa);
627
628 /* Add to big hash table */
629 hash = ipv6_addr_hash(addr);
630
631 ifa->lst_next = inet6_addr_lst[hash];
632 inet6_addr_lst[hash] = ifa;
633 in6_ifa_hold(ifa);
634 write_unlock(&addrconf_hash_lock);
635
636 write_lock(&idev->lock);
637 /* Add to inet6_dev unicast addr list. */
638 ipv6_link_dev_addr(idev, ifa);
639
640 #ifdef CONFIG_IPV6_PRIVACY
641 if (ifa->flags&IFA_F_TEMPORARY) {
642 ifa->tmp_next = idev->tempaddr_list;
643 idev->tempaddr_list = ifa;
644 in6_ifa_hold(ifa);
645 }
646 #endif
647
648 in6_ifa_hold(ifa);
649 write_unlock(&idev->lock);
650 out2:
651 rcu_read_unlock_bh();
652
653 if (likely(err == 0))
654 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
655 else {
656 kfree(ifa);
657 ifa = ERR_PTR(err);
658 }
659
660 return ifa;
661 out:
662 write_unlock(&addrconf_hash_lock);
663 goto out2;
664 }
665
666 /* This function wants to get referenced ifp and releases it before return */
667
668 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
669 {
670 struct inet6_ifaddr *ifa, **ifap;
671 struct inet6_dev *idev = ifp->idev;
672 int hash;
673 int deleted = 0, onlink = 0;
674 unsigned long expires = jiffies;
675
676 hash = ipv6_addr_hash(&ifp->addr);
677
678 ifp->dead = 1;
679
680 write_lock_bh(&addrconf_hash_lock);
681 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
682 ifap = &ifa->lst_next) {
683 if (ifa == ifp) {
684 *ifap = ifa->lst_next;
685 __in6_ifa_put(ifp);
686 ifa->lst_next = NULL;
687 break;
688 }
689 }
690 write_unlock_bh(&addrconf_hash_lock);
691
692 write_lock_bh(&idev->lock);
693 #ifdef CONFIG_IPV6_PRIVACY
694 if (ifp->flags&IFA_F_TEMPORARY) {
695 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
696 ifap = &ifa->tmp_next) {
697 if (ifa == ifp) {
698 *ifap = ifa->tmp_next;
699 if (ifp->ifpub) {
700 in6_ifa_put(ifp->ifpub);
701 ifp->ifpub = NULL;
702 }
703 __in6_ifa_put(ifp);
704 ifa->tmp_next = NULL;
705 break;
706 }
707 }
708 }
709 #endif
710
711 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
712 if (ifa == ifp) {
713 *ifap = ifa->if_next;
714 __in6_ifa_put(ifp);
715 ifa->if_next = NULL;
716 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
717 break;
718 deleted = 1;
719 continue;
720 } else if (ifp->flags & IFA_F_PERMANENT) {
721 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
722 ifp->prefix_len)) {
723 if (ifa->flags & IFA_F_PERMANENT) {
724 onlink = 1;
725 if (deleted)
726 break;
727 } else {
728 unsigned long lifetime;
729
730 if (!onlink)
731 onlink = -1;
732
733 spin_lock(&ifa->lock);
734 lifetime = min_t(unsigned long,
735 ifa->valid_lft, 0x7fffffffUL/HZ);
736 if (time_before(expires,
737 ifa->tstamp + lifetime * HZ))
738 expires = ifa->tstamp + lifetime * HZ;
739 spin_unlock(&ifa->lock);
740 }
741 }
742 }
743 ifap = &ifa->if_next;
744 }
745 write_unlock_bh(&idev->lock);
746
747 ipv6_ifa_notify(RTM_DELADDR, ifp);
748
749 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
750
751 addrconf_del_timer(ifp);
752
753 /*
754 * Purge or update corresponding prefix
755 *
756 * 1) we don't purge prefix here if address was not permanent.
757 * prefix is managed by its own lifetime.
758 * 2) if there're no addresses, delete prefix.
759 * 3) if there're still other permanent address(es),
760 * corresponding prefix is still permanent.
761 * 4) otherwise, update prefix lifetime to the
762 * longest valid lifetime among the corresponding
763 * addresses on the device.
764 * Note: subsequent RA will update lifetime.
765 *
766 * --yoshfuji
767 */
768 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
769 struct in6_addr prefix;
770 struct rt6_info *rt;
771 struct net *net = dev_net(ifp->idev->dev);
772 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
773 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
774
775 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
776 if (onlink == 0) {
777 ip6_del_rt(rt);
778 rt = NULL;
779 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
780 rt->rt6i_expires = expires;
781 rt->rt6i_flags |= RTF_EXPIRES;
782 }
783 }
784 dst_release(&rt->u.dst);
785 }
786
787 in6_ifa_put(ifp);
788 }
789
790 #ifdef CONFIG_IPV6_PRIVACY
791 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
792 {
793 struct inet6_dev *idev = ifp->idev;
794 struct in6_addr addr, *tmpaddr;
795 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
796 unsigned long regen_advance;
797 int tmp_plen;
798 int ret = 0;
799 int max_addresses;
800 u32 addr_flags;
801
802 write_lock(&idev->lock);
803 if (ift) {
804 spin_lock_bh(&ift->lock);
805 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
806 spin_unlock_bh(&ift->lock);
807 tmpaddr = &addr;
808 } else {
809 tmpaddr = NULL;
810 }
811 retry:
812 in6_dev_hold(idev);
813 if (idev->cnf.use_tempaddr <= 0) {
814 write_unlock(&idev->lock);
815 printk(KERN_INFO
816 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
817 in6_dev_put(idev);
818 ret = -1;
819 goto out;
820 }
821 spin_lock_bh(&ifp->lock);
822 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
823 idev->cnf.use_tempaddr = -1; /*XXX*/
824 spin_unlock_bh(&ifp->lock);
825 write_unlock(&idev->lock);
826 printk(KERN_WARNING
827 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
828 in6_dev_put(idev);
829 ret = -1;
830 goto out;
831 }
832 in6_ifa_hold(ifp);
833 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
834 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
835 spin_unlock_bh(&ifp->lock);
836 write_unlock(&idev->lock);
837 printk(KERN_WARNING
838 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
839 in6_ifa_put(ifp);
840 in6_dev_put(idev);
841 ret = -1;
842 goto out;
843 }
844 memcpy(&addr.s6_addr[8], idev->rndid, 8);
845 tmp_valid_lft = min_t(__u32,
846 ifp->valid_lft,
847 idev->cnf.temp_valid_lft);
848 tmp_prefered_lft = min_t(__u32,
849 ifp->prefered_lft,
850 idev->cnf.temp_prefered_lft - desync_factor / HZ);
851 tmp_plen = ifp->prefix_len;
852 max_addresses = idev->cnf.max_addresses;
853 tmp_cstamp = ifp->cstamp;
854 tmp_tstamp = ifp->tstamp;
855 spin_unlock_bh(&ifp->lock);
856
857 regen_advance = idev->cnf.regen_max_retry *
858 idev->cnf.dad_transmits *
859 idev->nd_parms->retrans_time / HZ;
860 write_unlock(&idev->lock);
861
862 /* A temporary address is created only if this calculated Preferred
863 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
864 * an implementation must not create a temporary address with a zero
865 * Preferred Lifetime.
866 */
867 if (tmp_prefered_lft <= regen_advance) {
868 in6_ifa_put(ifp);
869 in6_dev_put(idev);
870 ret = -1;
871 goto out;
872 }
873
874 addr_flags = IFA_F_TEMPORARY;
875 /* set in addrconf_prefix_rcv() */
876 if (ifp->flags & IFA_F_OPTIMISTIC)
877 addr_flags |= IFA_F_OPTIMISTIC;
878
879 ift = !max_addresses ||
880 ipv6_count_addresses(idev) < max_addresses ?
881 ipv6_add_addr(idev, &addr, tmp_plen,
882 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
883 addr_flags) : NULL;
884 if (!ift || IS_ERR(ift)) {
885 in6_ifa_put(ifp);
886 in6_dev_put(idev);
887 printk(KERN_INFO
888 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
889 tmpaddr = &addr;
890 write_lock(&idev->lock);
891 goto retry;
892 }
893
894 spin_lock_bh(&ift->lock);
895 ift->ifpub = ifp;
896 ift->valid_lft = tmp_valid_lft;
897 ift->prefered_lft = tmp_prefered_lft;
898 ift->cstamp = tmp_cstamp;
899 ift->tstamp = tmp_tstamp;
900 spin_unlock_bh(&ift->lock);
901
902 addrconf_dad_start(ift, 0);
903 in6_ifa_put(ift);
904 in6_dev_put(idev);
905 out:
906 return ret;
907 }
908 #endif
909
910 /*
911 * Choose an appropriate source address (RFC3484)
912 */
913 enum {
914 IPV6_SADDR_RULE_INIT = 0,
915 IPV6_SADDR_RULE_LOCAL,
916 IPV6_SADDR_RULE_SCOPE,
917 IPV6_SADDR_RULE_PREFERRED,
918 #ifdef CONFIG_IPV6_MIP6
919 IPV6_SADDR_RULE_HOA,
920 #endif
921 IPV6_SADDR_RULE_OIF,
922 IPV6_SADDR_RULE_LABEL,
923 #ifdef CONFIG_IPV6_PRIVACY
924 IPV6_SADDR_RULE_PRIVACY,
925 #endif
926 IPV6_SADDR_RULE_ORCHID,
927 IPV6_SADDR_RULE_PREFIX,
928 IPV6_SADDR_RULE_MAX
929 };
930
931 struct ipv6_saddr_score {
932 int rule;
933 int addr_type;
934 struct inet6_ifaddr *ifa;
935 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
936 int scopedist;
937 int matchlen;
938 };
939
940 struct ipv6_saddr_dst {
941 const struct in6_addr *addr;
942 int ifindex;
943 int scope;
944 int label;
945 unsigned int prefs;
946 };
947
948 static inline int ipv6_saddr_preferred(int type)
949 {
950 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
951 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
952 return 1;
953 return 0;
954 }
955
956 static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score,
957 struct ipv6_saddr_dst *dst,
958 int i)
959 {
960 int ret;
961
962 if (i <= score->rule) {
963 switch (i) {
964 case IPV6_SADDR_RULE_SCOPE:
965 ret = score->scopedist;
966 break;
967 case IPV6_SADDR_RULE_PREFIX:
968 ret = score->matchlen;
969 break;
970 default:
971 ret = !!test_bit(i, score->scorebits);
972 }
973 goto out;
974 }
975
976 switch (i) {
977 case IPV6_SADDR_RULE_INIT:
978 /* Rule 0: remember if hiscore is not ready yet */
979 ret = !!score->ifa;
980 break;
981 case IPV6_SADDR_RULE_LOCAL:
982 /* Rule 1: Prefer same address */
983 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
984 break;
985 case IPV6_SADDR_RULE_SCOPE:
986 /* Rule 2: Prefer appropriate scope
987 *
988 * ret
989 * ^
990 * -1 | d 15
991 * ---+--+-+---> scope
992 * |
993 * | d is scope of the destination.
994 * B-d | \
995 * | \ <- smaller scope is better if
996 * B-15 | \ if scope is enough for destinaion.
997 * | ret = B - scope (-1 <= scope >= d <= 15).
998 * d-C-1 | /
999 * |/ <- greater is better
1000 * -C / if scope is not enough for destination.
1001 * /| ret = scope - C (-1 <= d < scope <= 15).
1002 *
1003 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1004 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1005 * Assume B = 0 and we get C > 29.
1006 */
1007 ret = __ipv6_addr_src_scope(score->addr_type);
1008 if (ret >= dst->scope)
1009 ret = -ret;
1010 else
1011 ret -= 128; /* 30 is enough */
1012 score->scopedist = ret;
1013 break;
1014 case IPV6_SADDR_RULE_PREFERRED:
1015 /* Rule 3: Avoid deprecated and optimistic addresses */
1016 ret = ipv6_saddr_preferred(score->addr_type) ||
1017 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1018 break;
1019 #ifdef CONFIG_IPV6_MIP6
1020 case IPV6_SADDR_RULE_HOA:
1021 {
1022 /* Rule 4: Prefer home address */
1023 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1024 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1025 break;
1026 }
1027 #endif
1028 case IPV6_SADDR_RULE_OIF:
1029 /* Rule 5: Prefer outgoing interface */
1030 ret = (!dst->ifindex ||
1031 dst->ifindex == score->ifa->idev->dev->ifindex);
1032 break;
1033 case IPV6_SADDR_RULE_LABEL:
1034 /* Rule 6: Prefer matching label */
1035 ret = ipv6_addr_label(&score->ifa->addr, score->addr_type,
1036 score->ifa->idev->dev->ifindex) == dst->label;
1037 break;
1038 #ifdef CONFIG_IPV6_PRIVACY
1039 case IPV6_SADDR_RULE_PRIVACY:
1040 {
1041 /* Rule 7: Prefer public address
1042 * Note: prefer temprary address if use_tempaddr >= 2
1043 */
1044 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1045 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1046 score->ifa->idev->cnf.use_tempaddr >= 2;
1047 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1048 break;
1049 }
1050 #endif
1051 case IPV6_SADDR_RULE_ORCHID:
1052 /* Rule 8-: Prefer ORCHID vs ORCHID or
1053 * non-ORCHID vs non-ORCHID
1054 */
1055 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1056 ipv6_addr_orchid(dst->addr));
1057 break;
1058 case IPV6_SADDR_RULE_PREFIX:
1059 /* Rule 8: Use longest matching prefix */
1060 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1061 dst->addr);
1062 break;
1063 default:
1064 ret = 0;
1065 }
1066
1067 if (ret)
1068 __set_bit(i, score->scorebits);
1069 score->rule = i;
1070 out:
1071 return ret;
1072 }
1073
1074 int ipv6_dev_get_saddr(struct net_device *dst_dev,
1075 const struct in6_addr *daddr, unsigned int prefs,
1076 struct in6_addr *saddr)
1077 {
1078 struct ipv6_saddr_score scores[2],
1079 *score = &scores[0], *hiscore = &scores[1];
1080 struct net *net = dev_net(dst_dev);
1081 struct ipv6_saddr_dst dst;
1082 struct net_device *dev;
1083 int dst_type;
1084
1085 dst_type = __ipv6_addr_type(daddr);
1086 dst.addr = daddr;
1087 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1088 dst.scope = __ipv6_addr_src_scope(dst_type);
1089 dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex);
1090 dst.prefs = prefs;
1091
1092 hiscore->rule = -1;
1093 hiscore->ifa = NULL;
1094
1095 read_lock(&dev_base_lock);
1096 rcu_read_lock();
1097
1098 for_each_netdev(net, dev) {
1099 struct inet6_dev *idev;
1100
1101 /* Candidate Source Address (section 4)
1102 * - multicast and link-local destination address,
1103 * the set of candidate source address MUST only
1104 * include addresses assigned to interfaces
1105 * belonging to the same link as the outgoing
1106 * interface.
1107 * (- For site-local destination addresses, the
1108 * set of candidate source addresses MUST only
1109 * include addresses assigned to interfaces
1110 * belonging to the same site as the outgoing
1111 * interface.)
1112 */
1113 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1114 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1115 dst.ifindex && dev->ifindex != dst.ifindex)
1116 continue;
1117
1118 idev = __in6_dev_get(dev);
1119 if (!idev)
1120 continue;
1121
1122 read_lock_bh(&idev->lock);
1123 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1124 int i;
1125
1126 /*
1127 * - Tentative Address (RFC2462 section 5.4)
1128 * - A tentative address is not considered
1129 * "assigned to an interface" in the traditional
1130 * sense, unless it is also flagged as optimistic.
1131 * - Candidate Source Address (section 4)
1132 * - In any case, anycast addresses, multicast
1133 * addresses, and the unspecified address MUST
1134 * NOT be included in a candidate set.
1135 */
1136 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1137 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1138 continue;
1139
1140 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1141
1142 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1143 score->addr_type & IPV6_ADDR_MULTICAST)) {
1144 LIMIT_NETDEBUG(KERN_DEBUG
1145 "ADDRCONF: unspecified / multicast address "
1146 "assigned as unicast address on %s",
1147 dev->name);
1148 continue;
1149 }
1150
1151 score->rule = -1;
1152 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1153
1154 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1155 int minihiscore, miniscore;
1156
1157 minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i);
1158 miniscore = ipv6_get_saddr_eval(score, &dst, i);
1159
1160 if (minihiscore > miniscore) {
1161 if (i == IPV6_SADDR_RULE_SCOPE &&
1162 score->scopedist > 0) {
1163 /*
1164 * special case:
1165 * each remaining entry
1166 * has too small (not enough)
1167 * scope, because ifa entries
1168 * are sorted by their scope
1169 * values.
1170 */
1171 goto try_nextdev;
1172 }
1173 break;
1174 } else if (minihiscore < miniscore) {
1175 struct ipv6_saddr_score *tmp;
1176
1177 if (hiscore->ifa)
1178 in6_ifa_put(hiscore->ifa);
1179
1180 in6_ifa_hold(score->ifa);
1181
1182 tmp = hiscore;
1183 hiscore = score;
1184 score = tmp;
1185
1186 /* restore our iterator */
1187 score->ifa = hiscore->ifa;
1188
1189 break;
1190 }
1191 }
1192 }
1193 try_nextdev:
1194 read_unlock_bh(&idev->lock);
1195 }
1196 rcu_read_unlock();
1197 read_unlock(&dev_base_lock);
1198
1199 if (!hiscore->ifa)
1200 return -EADDRNOTAVAIL;
1201
1202 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1203 in6_ifa_put(hiscore->ifa);
1204 return 0;
1205 }
1206
1207 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1208
1209 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1210 unsigned char banned_flags)
1211 {
1212 struct inet6_dev *idev;
1213 int err = -EADDRNOTAVAIL;
1214
1215 rcu_read_lock();
1216 if ((idev = __in6_dev_get(dev)) != NULL) {
1217 struct inet6_ifaddr *ifp;
1218
1219 read_lock_bh(&idev->lock);
1220 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1221 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1222 ipv6_addr_copy(addr, &ifp->addr);
1223 err = 0;
1224 break;
1225 }
1226 }
1227 read_unlock_bh(&idev->lock);
1228 }
1229 rcu_read_unlock();
1230 return err;
1231 }
1232
1233 static int ipv6_count_addresses(struct inet6_dev *idev)
1234 {
1235 int cnt = 0;
1236 struct inet6_ifaddr *ifp;
1237
1238 read_lock_bh(&idev->lock);
1239 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1240 cnt++;
1241 read_unlock_bh(&idev->lock);
1242 return cnt;
1243 }
1244
1245 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1246 struct net_device *dev, int strict)
1247 {
1248 struct inet6_ifaddr * ifp;
1249 u8 hash = ipv6_addr_hash(addr);
1250
1251 read_lock_bh(&addrconf_hash_lock);
1252 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1253 if (!net_eq(dev_net(ifp->idev->dev), net))
1254 continue;
1255 if (ipv6_addr_equal(&ifp->addr, addr) &&
1256 !(ifp->flags&IFA_F_TENTATIVE)) {
1257 if (dev == NULL || ifp->idev->dev == dev ||
1258 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1259 break;
1260 }
1261 }
1262 read_unlock_bh(&addrconf_hash_lock);
1263 return ifp != NULL;
1264 }
1265 EXPORT_SYMBOL(ipv6_chk_addr);
1266
1267 static
1268 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1269 struct net_device *dev)
1270 {
1271 struct inet6_ifaddr * ifp;
1272 u8 hash = ipv6_addr_hash(addr);
1273
1274 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1275 if (!net_eq(dev_net(ifp->idev->dev), net))
1276 continue;
1277 if (ipv6_addr_equal(&ifp->addr, addr)) {
1278 if (dev == NULL || ifp->idev->dev == dev)
1279 break;
1280 }
1281 }
1282 return ifp != NULL;
1283 }
1284
1285 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1286 {
1287 struct inet6_dev *idev;
1288 struct inet6_ifaddr *ifa;
1289 int onlink;
1290
1291 onlink = 0;
1292 rcu_read_lock();
1293 idev = __in6_dev_get(dev);
1294 if (idev) {
1295 read_lock_bh(&idev->lock);
1296 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1297 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1298 ifa->prefix_len);
1299 if (onlink)
1300 break;
1301 }
1302 read_unlock_bh(&idev->lock);
1303 }
1304 rcu_read_unlock();
1305 return onlink;
1306 }
1307
1308 EXPORT_SYMBOL(ipv6_chk_prefix);
1309
1310 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1311 struct net_device *dev, int strict)
1312 {
1313 struct inet6_ifaddr * ifp;
1314 u8 hash = ipv6_addr_hash(addr);
1315
1316 read_lock_bh(&addrconf_hash_lock);
1317 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1318 if (!net_eq(dev_net(ifp->idev->dev), net))
1319 continue;
1320 if (ipv6_addr_equal(&ifp->addr, addr)) {
1321 if (dev == NULL || ifp->idev->dev == dev ||
1322 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1323 in6_ifa_hold(ifp);
1324 break;
1325 }
1326 }
1327 }
1328 read_unlock_bh(&addrconf_hash_lock);
1329
1330 return ifp;
1331 }
1332
1333 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1334 {
1335 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1336 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1337 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1338 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1339 int sk_ipv6only = ipv6_only_sock(sk);
1340 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1341 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1342 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1343
1344 if (!sk2_rcv_saddr && !sk_ipv6only)
1345 return 1;
1346
1347 if (addr_type2 == IPV6_ADDR_ANY &&
1348 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1349 return 1;
1350
1351 if (addr_type == IPV6_ADDR_ANY &&
1352 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1353 return 1;
1354
1355 if (sk2_rcv_saddr6 &&
1356 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1357 return 1;
1358
1359 if (addr_type == IPV6_ADDR_MAPPED &&
1360 !sk2_ipv6only &&
1361 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1362 return 1;
1363
1364 return 0;
1365 }
1366
1367 /* Gets referenced address, destroys ifaddr */
1368
1369 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1370 {
1371 if (ifp->flags&IFA_F_PERMANENT) {
1372 spin_lock_bh(&ifp->lock);
1373 addrconf_del_timer(ifp);
1374 ifp->flags |= IFA_F_TENTATIVE;
1375 spin_unlock_bh(&ifp->lock);
1376 in6_ifa_put(ifp);
1377 #ifdef CONFIG_IPV6_PRIVACY
1378 } else if (ifp->flags&IFA_F_TEMPORARY) {
1379 struct inet6_ifaddr *ifpub;
1380 spin_lock_bh(&ifp->lock);
1381 ifpub = ifp->ifpub;
1382 if (ifpub) {
1383 in6_ifa_hold(ifpub);
1384 spin_unlock_bh(&ifp->lock);
1385 ipv6_create_tempaddr(ifpub, ifp);
1386 in6_ifa_put(ifpub);
1387 } else {
1388 spin_unlock_bh(&ifp->lock);
1389 }
1390 ipv6_del_addr(ifp);
1391 #endif
1392 } else
1393 ipv6_del_addr(ifp);
1394 }
1395
1396 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1397 {
1398 if (net_ratelimit())
1399 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1400 addrconf_dad_stop(ifp);
1401 }
1402
1403 /* Join to solicited addr multicast group. */
1404
1405 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1406 {
1407 struct in6_addr maddr;
1408
1409 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1410 return;
1411
1412 addrconf_addr_solict_mult(addr, &maddr);
1413 ipv6_dev_mc_inc(dev, &maddr);
1414 }
1415
1416 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1417 {
1418 struct in6_addr maddr;
1419
1420 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1421 return;
1422
1423 addrconf_addr_solict_mult(addr, &maddr);
1424 __ipv6_dev_mc_dec(idev, &maddr);
1425 }
1426
1427 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1428 {
1429 struct in6_addr addr;
1430 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1431 if (ipv6_addr_any(&addr))
1432 return;
1433 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1434 }
1435
1436 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1437 {
1438 struct in6_addr addr;
1439 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1440 if (ipv6_addr_any(&addr))
1441 return;
1442 __ipv6_dev_ac_dec(ifp->idev, &addr);
1443 }
1444
1445 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1446 {
1447 if (dev->addr_len != ETH_ALEN)
1448 return -1;
1449 memcpy(eui, dev->dev_addr, 3);
1450 memcpy(eui + 5, dev->dev_addr + 3, 3);
1451
1452 /*
1453 * The zSeries OSA network cards can be shared among various
1454 * OS instances, but the OSA cards have only one MAC address.
1455 * This leads to duplicate address conflicts in conjunction
1456 * with IPv6 if more than one instance uses the same card.
1457 *
1458 * The driver for these cards can deliver a unique 16-bit
1459 * identifier for each instance sharing the same card. It is
1460 * placed instead of 0xFFFE in the interface identifier. The
1461 * "u" bit of the interface identifier is not inverted in this
1462 * case. Hence the resulting interface identifier has local
1463 * scope according to RFC2373.
1464 */
1465 if (dev->dev_id) {
1466 eui[3] = (dev->dev_id >> 8) & 0xFF;
1467 eui[4] = dev->dev_id & 0xFF;
1468 } else {
1469 eui[3] = 0xFF;
1470 eui[4] = 0xFE;
1471 eui[0] ^= 2;
1472 }
1473 return 0;
1474 }
1475
1476 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1477 {
1478 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1479 if (dev->addr_len != ARCNET_ALEN)
1480 return -1;
1481 memset(eui, 0, 7);
1482 eui[7] = *(u8*)dev->dev_addr;
1483 return 0;
1484 }
1485
1486 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1487 {
1488 if (dev->addr_len != INFINIBAND_ALEN)
1489 return -1;
1490 memcpy(eui, dev->dev_addr + 12, 8);
1491 eui[0] |= 2;
1492 return 0;
1493 }
1494
1495 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1496 {
1497 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1498 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1499 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1500 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1501 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1502 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1503 eui[1] = 0;
1504 eui[2] = 0x5E;
1505 eui[3] = 0xFE;
1506 memcpy(eui + 4, &addr, 4);
1507 return 0;
1508 }
1509 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1510
1511 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1512 {
1513 if (dev->priv_flags & IFF_ISATAP)
1514 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1515 return -1;
1516 }
1517
1518 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1519 {
1520 switch (dev->type) {
1521 case ARPHRD_ETHER:
1522 case ARPHRD_FDDI:
1523 case ARPHRD_IEEE802_TR:
1524 return addrconf_ifid_eui48(eui, dev);
1525 case ARPHRD_ARCNET:
1526 return addrconf_ifid_arcnet(eui, dev);
1527 case ARPHRD_INFINIBAND:
1528 return addrconf_ifid_infiniband(eui, dev);
1529 case ARPHRD_SIT:
1530 return addrconf_ifid_sit(eui, dev);
1531 }
1532 return -1;
1533 }
1534
1535 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1536 {
1537 int err = -1;
1538 struct inet6_ifaddr *ifp;
1539
1540 read_lock_bh(&idev->lock);
1541 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1542 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1543 memcpy(eui, ifp->addr.s6_addr+8, 8);
1544 err = 0;
1545 break;
1546 }
1547 }
1548 read_unlock_bh(&idev->lock);
1549 return err;
1550 }
1551
1552 #ifdef CONFIG_IPV6_PRIVACY
1553 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1554 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1555 {
1556 regen:
1557 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1558 idev->rndid[0] &= ~0x02;
1559
1560 /*
1561 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1562 * check if generated address is not inappropriate
1563 *
1564 * - Reserved subnet anycast (RFC 2526)
1565 * 11111101 11....11 1xxxxxxx
1566 * - ISATAP (RFC4214) 6.1
1567 * 00-00-5E-FE-xx-xx-xx-xx
1568 * - value 0
1569 * - XXX: already assigned to an address on the device
1570 */
1571 if (idev->rndid[0] == 0xfd &&
1572 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1573 (idev->rndid[7]&0x80))
1574 goto regen;
1575 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1576 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1577 goto regen;
1578 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1579 goto regen;
1580 }
1581
1582 return 0;
1583 }
1584
1585 static void ipv6_regen_rndid(unsigned long data)
1586 {
1587 struct inet6_dev *idev = (struct inet6_dev *) data;
1588 unsigned long expires;
1589
1590 rcu_read_lock_bh();
1591 write_lock_bh(&idev->lock);
1592
1593 if (idev->dead)
1594 goto out;
1595
1596 if (__ipv6_regen_rndid(idev) < 0)
1597 goto out;
1598
1599 expires = jiffies +
1600 idev->cnf.temp_prefered_lft * HZ -
1601 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1602 if (time_before(expires, jiffies)) {
1603 printk(KERN_WARNING
1604 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1605 idev->dev->name);
1606 goto out;
1607 }
1608
1609 if (!mod_timer(&idev->regen_timer, expires))
1610 in6_dev_hold(idev);
1611
1612 out:
1613 write_unlock_bh(&idev->lock);
1614 rcu_read_unlock_bh();
1615 in6_dev_put(idev);
1616 }
1617
1618 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1619 int ret = 0;
1620
1621 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1622 ret = __ipv6_regen_rndid(idev);
1623 return ret;
1624 }
1625 #endif
1626
1627 /*
1628 * Add prefix route.
1629 */
1630
1631 static void
1632 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1633 unsigned long expires, u32 flags)
1634 {
1635 struct fib6_config cfg = {
1636 .fc_table = RT6_TABLE_PREFIX,
1637 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1638 .fc_ifindex = dev->ifindex,
1639 .fc_expires = expires,
1640 .fc_dst_len = plen,
1641 .fc_flags = RTF_UP | flags,
1642 .fc_nlinfo.nl_net = dev_net(dev),
1643 };
1644
1645 ipv6_addr_copy(&cfg.fc_dst, pfx);
1646
1647 /* Prevent useless cloning on PtP SIT.
1648 This thing is done here expecting that the whole
1649 class of non-broadcast devices need not cloning.
1650 */
1651 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1652 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1653 cfg.fc_flags |= RTF_NONEXTHOP;
1654 #endif
1655
1656 ip6_route_add(&cfg);
1657 }
1658
1659 /* Create "default" multicast route to the interface */
1660
1661 static void addrconf_add_mroute(struct net_device *dev)
1662 {
1663 struct fib6_config cfg = {
1664 .fc_table = RT6_TABLE_LOCAL,
1665 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1666 .fc_ifindex = dev->ifindex,
1667 .fc_dst_len = 8,
1668 .fc_flags = RTF_UP,
1669 .fc_nlinfo.nl_net = dev_net(dev),
1670 };
1671
1672 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1673
1674 ip6_route_add(&cfg);
1675 }
1676
1677 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1678 static void sit_route_add(struct net_device *dev)
1679 {
1680 struct fib6_config cfg = {
1681 .fc_table = RT6_TABLE_MAIN,
1682 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1683 .fc_ifindex = dev->ifindex,
1684 .fc_dst_len = 96,
1685 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1686 .fc_nlinfo.nl_net = dev_net(dev),
1687 };
1688
1689 /* prefix length - 96 bits "::d.d.d.d" */
1690 ip6_route_add(&cfg);
1691 }
1692 #endif
1693
1694 static void addrconf_add_lroute(struct net_device *dev)
1695 {
1696 struct in6_addr addr;
1697
1698 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1699 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1700 }
1701
1702 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1703 {
1704 struct inet6_dev *idev;
1705
1706 ASSERT_RTNL();
1707
1708 if ((idev = ipv6_find_idev(dev)) == NULL)
1709 return NULL;
1710
1711 /* Add default multicast route */
1712 addrconf_add_mroute(dev);
1713
1714 /* Add link local route */
1715 addrconf_add_lroute(dev);
1716 return idev;
1717 }
1718
1719 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1720 {
1721 struct prefix_info *pinfo;
1722 __u32 valid_lft;
1723 __u32 prefered_lft;
1724 int addr_type;
1725 unsigned long rt_expires;
1726 struct inet6_dev *in6_dev;
1727
1728 pinfo = (struct prefix_info *) opt;
1729
1730 if (len < sizeof(struct prefix_info)) {
1731 ADBG(("addrconf: prefix option too short\n"));
1732 return;
1733 }
1734
1735 /*
1736 * Validation checks ([ADDRCONF], page 19)
1737 */
1738
1739 addr_type = ipv6_addr_type(&pinfo->prefix);
1740
1741 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1742 return;
1743
1744 valid_lft = ntohl(pinfo->valid);
1745 prefered_lft = ntohl(pinfo->prefered);
1746
1747 if (prefered_lft > valid_lft) {
1748 if (net_ratelimit())
1749 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1750 return;
1751 }
1752
1753 in6_dev = in6_dev_get(dev);
1754
1755 if (in6_dev == NULL) {
1756 if (net_ratelimit())
1757 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1758 return;
1759 }
1760
1761 /*
1762 * Two things going on here:
1763 * 1) Add routes for on-link prefixes
1764 * 2) Configure prefixes with the auto flag set
1765 */
1766
1767 /* Avoid arithmetic overflow. Really, we could
1768 save rt_expires in seconds, likely valid_lft,
1769 but it would require division in fib gc, that it
1770 not good.
1771 */
1772 if (valid_lft >= 0x7FFFFFFF/HZ)
1773 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1774 else
1775 rt_expires = valid_lft * HZ;
1776
1777 /*
1778 * We convert this (in jiffies) to clock_t later.
1779 * Avoid arithmetic overflow there as well.
1780 * Overflow can happen only if HZ < USER_HZ.
1781 */
1782 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1783 rt_expires = 0x7FFFFFFF / USER_HZ;
1784
1785 if (pinfo->onlink) {
1786 struct rt6_info *rt;
1787 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
1788 dev->ifindex, 1);
1789
1790 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1791 if (rt->rt6i_flags&RTF_EXPIRES) {
1792 if (valid_lft == 0) {
1793 ip6_del_rt(rt);
1794 rt = NULL;
1795 } else {
1796 rt->rt6i_expires = jiffies + rt_expires;
1797 }
1798 }
1799 } else if (valid_lft) {
1800 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1801 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1802 }
1803 if (rt)
1804 dst_release(&rt->u.dst);
1805 }
1806
1807 /* Try to figure out our local address for this prefix */
1808
1809 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1810 struct inet6_ifaddr * ifp;
1811 struct in6_addr addr;
1812 int create = 0, update_lft = 0;
1813
1814 if (pinfo->prefix_len == 64) {
1815 memcpy(&addr, &pinfo->prefix, 8);
1816 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1817 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1818 in6_dev_put(in6_dev);
1819 return;
1820 }
1821 goto ok;
1822 }
1823 if (net_ratelimit())
1824 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1825 pinfo->prefix_len);
1826 in6_dev_put(in6_dev);
1827 return;
1828
1829 ok:
1830
1831 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1);
1832
1833 if (ifp == NULL && valid_lft) {
1834 int max_addresses = in6_dev->cnf.max_addresses;
1835 u32 addr_flags = 0;
1836
1837 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1838 if (in6_dev->cnf.optimistic_dad &&
1839 !ipv6_devconf.forwarding)
1840 addr_flags = IFA_F_OPTIMISTIC;
1841 #endif
1842
1843 /* Do not allow to create too much of autoconfigured
1844 * addresses; this would be too easy way to crash kernel.
1845 */
1846 if (!max_addresses ||
1847 ipv6_count_addresses(in6_dev) < max_addresses)
1848 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1849 addr_type&IPV6_ADDR_SCOPE_MASK,
1850 addr_flags);
1851
1852 if (!ifp || IS_ERR(ifp)) {
1853 in6_dev_put(in6_dev);
1854 return;
1855 }
1856
1857 update_lft = create = 1;
1858 ifp->cstamp = jiffies;
1859 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1860 }
1861
1862 if (ifp) {
1863 int flags;
1864 unsigned long now;
1865 #ifdef CONFIG_IPV6_PRIVACY
1866 struct inet6_ifaddr *ift;
1867 #endif
1868 u32 stored_lft;
1869
1870 /* update lifetime (RFC2462 5.5.3 e) */
1871 spin_lock(&ifp->lock);
1872 now = jiffies;
1873 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1874 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1875 else
1876 stored_lft = 0;
1877 if (!update_lft && stored_lft) {
1878 if (valid_lft > MIN_VALID_LIFETIME ||
1879 valid_lft > stored_lft)
1880 update_lft = 1;
1881 else if (stored_lft <= MIN_VALID_LIFETIME) {
1882 /* valid_lft <= stored_lft is always true */
1883 /* XXX: IPsec */
1884 update_lft = 0;
1885 } else {
1886 valid_lft = MIN_VALID_LIFETIME;
1887 if (valid_lft < prefered_lft)
1888 prefered_lft = valid_lft;
1889 update_lft = 1;
1890 }
1891 }
1892
1893 if (update_lft) {
1894 ifp->valid_lft = valid_lft;
1895 ifp->prefered_lft = prefered_lft;
1896 ifp->tstamp = now;
1897 flags = ifp->flags;
1898 ifp->flags &= ~IFA_F_DEPRECATED;
1899 spin_unlock(&ifp->lock);
1900
1901 if (!(flags&IFA_F_TENTATIVE))
1902 ipv6_ifa_notify(0, ifp);
1903 } else
1904 spin_unlock(&ifp->lock);
1905
1906 #ifdef CONFIG_IPV6_PRIVACY
1907 read_lock_bh(&in6_dev->lock);
1908 /* update all temporary addresses in the list */
1909 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1910 /*
1911 * When adjusting the lifetimes of an existing
1912 * temporary address, only lower the lifetimes.
1913 * Implementations must not increase the
1914 * lifetimes of an existing temporary address
1915 * when processing a Prefix Information Option.
1916 */
1917 if (ifp != ift->ifpub)
1918 continue;
1919
1920 spin_lock(&ift->lock);
1921 flags = ift->flags;
1922 if (ift->valid_lft > valid_lft &&
1923 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1924 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1925 if (ift->prefered_lft > prefered_lft &&
1926 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1927 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1928 spin_unlock(&ift->lock);
1929 if (!(flags&IFA_F_TENTATIVE))
1930 ipv6_ifa_notify(0, ift);
1931 }
1932
1933 if (create && in6_dev->cnf.use_tempaddr > 0) {
1934 /*
1935 * When a new public address is created as described in [ADDRCONF],
1936 * also create a new temporary address.
1937 */
1938 read_unlock_bh(&in6_dev->lock);
1939 ipv6_create_tempaddr(ifp, NULL);
1940 } else {
1941 read_unlock_bh(&in6_dev->lock);
1942 }
1943 #endif
1944 in6_ifa_put(ifp);
1945 addrconf_verify(0);
1946 }
1947 }
1948 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1949 in6_dev_put(in6_dev);
1950 }
1951
1952 /*
1953 * Set destination address.
1954 * Special case for SIT interfaces where we create a new "virtual"
1955 * device.
1956 */
1957 int addrconf_set_dstaddr(struct net *net, void __user *arg)
1958 {
1959 struct in6_ifreq ireq;
1960 struct net_device *dev;
1961 int err = -EINVAL;
1962
1963 rtnl_lock();
1964
1965 err = -EFAULT;
1966 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1967 goto err_exit;
1968
1969 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1970
1971 err = -ENODEV;
1972 if (dev == NULL)
1973 goto err_exit;
1974
1975 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1976 if (dev->type == ARPHRD_SIT) {
1977 struct ifreq ifr;
1978 mm_segment_t oldfs;
1979 struct ip_tunnel_parm p;
1980
1981 err = -EADDRNOTAVAIL;
1982 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1983 goto err_exit;
1984
1985 memset(&p, 0, sizeof(p));
1986 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1987 p.iph.saddr = 0;
1988 p.iph.version = 4;
1989 p.iph.ihl = 5;
1990 p.iph.protocol = IPPROTO_IPV6;
1991 p.iph.ttl = 64;
1992 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1993
1994 oldfs = get_fs(); set_fs(KERNEL_DS);
1995 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1996 set_fs(oldfs);
1997
1998 if (err == 0) {
1999 err = -ENOBUFS;
2000 dev = __dev_get_by_name(net, p.name);
2001 if (!dev)
2002 goto err_exit;
2003 err = dev_open(dev);
2004 }
2005 }
2006 #endif
2007
2008 err_exit:
2009 rtnl_unlock();
2010 return err;
2011 }
2012
2013 /*
2014 * Manual configuration of address on an interface
2015 */
2016 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2017 int plen, __u8 ifa_flags, __u32 prefered_lft,
2018 __u32 valid_lft)
2019 {
2020 struct inet6_ifaddr *ifp;
2021 struct inet6_dev *idev;
2022 struct net_device *dev;
2023 int scope;
2024 u32 flags = RTF_EXPIRES;
2025
2026 ASSERT_RTNL();
2027
2028 /* check the lifetime */
2029 if (!valid_lft || prefered_lft > valid_lft)
2030 return -EINVAL;
2031
2032 dev = __dev_get_by_index(net, ifindex);
2033 if (!dev)
2034 return -ENODEV;
2035
2036 if ((idev = addrconf_add_dev(dev)) == NULL)
2037 return -ENOBUFS;
2038
2039 scope = ipv6_addr_scope(pfx);
2040
2041 if (valid_lft == INFINITY_LIFE_TIME) {
2042 ifa_flags |= IFA_F_PERMANENT;
2043 flags = 0;
2044 } else if (valid_lft >= 0x7FFFFFFF/HZ)
2045 valid_lft = 0x7FFFFFFF/HZ;
2046
2047 if (prefered_lft == 0)
2048 ifa_flags |= IFA_F_DEPRECATED;
2049 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2050 (prefered_lft != INFINITY_LIFE_TIME))
2051 prefered_lft = 0x7FFFFFFF/HZ;
2052
2053 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2054
2055 if (!IS_ERR(ifp)) {
2056 spin_lock_bh(&ifp->lock);
2057 ifp->valid_lft = valid_lft;
2058 ifp->prefered_lft = prefered_lft;
2059 ifp->tstamp = jiffies;
2060 spin_unlock_bh(&ifp->lock);
2061
2062 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2063 jiffies_to_clock_t(valid_lft * HZ), flags);
2064 /*
2065 * Note that section 3.1 of RFC 4429 indicates
2066 * that the Optimistic flag should not be set for
2067 * manually configured addresses
2068 */
2069 addrconf_dad_start(ifp, 0);
2070 in6_ifa_put(ifp);
2071 addrconf_verify(0);
2072 return 0;
2073 }
2074
2075 return PTR_ERR(ifp);
2076 }
2077
2078 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2079 int plen)
2080 {
2081 struct inet6_ifaddr *ifp;
2082 struct inet6_dev *idev;
2083 struct net_device *dev;
2084
2085 dev = __dev_get_by_index(net, ifindex);
2086 if (!dev)
2087 return -ENODEV;
2088
2089 if ((idev = __in6_dev_get(dev)) == NULL)
2090 return -ENXIO;
2091
2092 read_lock_bh(&idev->lock);
2093 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2094 if (ifp->prefix_len == plen &&
2095 ipv6_addr_equal(pfx, &ifp->addr)) {
2096 in6_ifa_hold(ifp);
2097 read_unlock_bh(&idev->lock);
2098
2099 ipv6_del_addr(ifp);
2100
2101 /* If the last address is deleted administratively,
2102 disable IPv6 on this interface.
2103 */
2104 if (idev->addr_list == NULL)
2105 addrconf_ifdown(idev->dev, 1);
2106 return 0;
2107 }
2108 }
2109 read_unlock_bh(&idev->lock);
2110 return -EADDRNOTAVAIL;
2111 }
2112
2113
2114 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2115 {
2116 struct in6_ifreq ireq;
2117 int err;
2118
2119 if (!capable(CAP_NET_ADMIN))
2120 return -EPERM;
2121
2122 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2123 return -EFAULT;
2124
2125 rtnl_lock();
2126 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2127 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2128 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2129 rtnl_unlock();
2130 return err;
2131 }
2132
2133 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2134 {
2135 struct in6_ifreq ireq;
2136 int err;
2137
2138 if (!capable(CAP_NET_ADMIN))
2139 return -EPERM;
2140
2141 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2142 return -EFAULT;
2143
2144 rtnl_lock();
2145 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2146 ireq.ifr6_prefixlen);
2147 rtnl_unlock();
2148 return err;
2149 }
2150
2151 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2152 static void sit_add_v4_addrs(struct inet6_dev *idev)
2153 {
2154 struct inet6_ifaddr * ifp;
2155 struct in6_addr addr;
2156 struct net_device *dev;
2157 struct net *net = dev_net(idev->dev);
2158 int scope;
2159
2160 ASSERT_RTNL();
2161
2162 memset(&addr, 0, sizeof(struct in6_addr));
2163 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2164
2165 if (idev->dev->flags&IFF_POINTOPOINT) {
2166 addr.s6_addr32[0] = htonl(0xfe800000);
2167 scope = IFA_LINK;
2168 } else {
2169 scope = IPV6_ADDR_COMPATv4;
2170 }
2171
2172 if (addr.s6_addr32[3]) {
2173 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2174 if (!IS_ERR(ifp)) {
2175 spin_lock_bh(&ifp->lock);
2176 ifp->flags &= ~IFA_F_TENTATIVE;
2177 spin_unlock_bh(&ifp->lock);
2178 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2179 in6_ifa_put(ifp);
2180 }
2181 return;
2182 }
2183
2184 for_each_netdev(net, dev) {
2185 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2186 if (in_dev && (dev->flags & IFF_UP)) {
2187 struct in_ifaddr * ifa;
2188
2189 int flag = scope;
2190
2191 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2192 int plen;
2193
2194 addr.s6_addr32[3] = ifa->ifa_local;
2195
2196 if (ifa->ifa_scope == RT_SCOPE_LINK)
2197 continue;
2198 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2199 if (idev->dev->flags&IFF_POINTOPOINT)
2200 continue;
2201 flag |= IFA_HOST;
2202 }
2203 if (idev->dev->flags&IFF_POINTOPOINT)
2204 plen = 64;
2205 else
2206 plen = 96;
2207
2208 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2209 IFA_F_PERMANENT);
2210 if (!IS_ERR(ifp)) {
2211 spin_lock_bh(&ifp->lock);
2212 ifp->flags &= ~IFA_F_TENTATIVE;
2213 spin_unlock_bh(&ifp->lock);
2214 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2215 in6_ifa_put(ifp);
2216 }
2217 }
2218 }
2219 }
2220 }
2221 #endif
2222
2223 static void init_loopback(struct net_device *dev)
2224 {
2225 struct inet6_dev *idev;
2226 struct inet6_ifaddr * ifp;
2227
2228 /* ::1 */
2229
2230 ASSERT_RTNL();
2231
2232 if ((idev = ipv6_find_idev(dev)) == NULL) {
2233 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2234 return;
2235 }
2236
2237 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2238 if (!IS_ERR(ifp)) {
2239 spin_lock_bh(&ifp->lock);
2240 ifp->flags &= ~IFA_F_TENTATIVE;
2241 spin_unlock_bh(&ifp->lock);
2242 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2243 in6_ifa_put(ifp);
2244 }
2245 }
2246
2247 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2248 {
2249 struct inet6_ifaddr * ifp;
2250 u32 addr_flags = IFA_F_PERMANENT;
2251
2252 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2253 if (idev->cnf.optimistic_dad &&
2254 !ipv6_devconf.forwarding)
2255 addr_flags |= IFA_F_OPTIMISTIC;
2256 #endif
2257
2258
2259 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2260 if (!IS_ERR(ifp)) {
2261 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2262 addrconf_dad_start(ifp, 0);
2263 in6_ifa_put(ifp);
2264 }
2265 }
2266
2267 static void addrconf_dev_config(struct net_device *dev)
2268 {
2269 struct in6_addr addr;
2270 struct inet6_dev * idev;
2271
2272 ASSERT_RTNL();
2273
2274 if ((dev->type != ARPHRD_ETHER) &&
2275 (dev->type != ARPHRD_FDDI) &&
2276 (dev->type != ARPHRD_IEEE802_TR) &&
2277 (dev->type != ARPHRD_ARCNET) &&
2278 (dev->type != ARPHRD_INFINIBAND)) {
2279 /* Alas, we support only Ethernet autoconfiguration. */
2280 return;
2281 }
2282
2283 idev = addrconf_add_dev(dev);
2284 if (idev == NULL)
2285 return;
2286
2287 memset(&addr, 0, sizeof(struct in6_addr));
2288 addr.s6_addr32[0] = htonl(0xFE800000);
2289
2290 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2291 addrconf_add_linklocal(idev, &addr);
2292 }
2293
2294 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2295 static void addrconf_sit_config(struct net_device *dev)
2296 {
2297 struct inet6_dev *idev;
2298
2299 ASSERT_RTNL();
2300
2301 /*
2302 * Configure the tunnel with one of our IPv4
2303 * addresses... we should configure all of
2304 * our v4 addrs in the tunnel
2305 */
2306
2307 if ((idev = ipv6_find_idev(dev)) == NULL) {
2308 printk(KERN_DEBUG "init sit: add_dev failed\n");
2309 return;
2310 }
2311
2312 if (dev->priv_flags & IFF_ISATAP) {
2313 struct in6_addr addr;
2314
2315 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2316 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2317 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2318 addrconf_add_linklocal(idev, &addr);
2319 return;
2320 }
2321
2322 sit_add_v4_addrs(idev);
2323
2324 if (dev->flags&IFF_POINTOPOINT) {
2325 addrconf_add_mroute(dev);
2326 addrconf_add_lroute(dev);
2327 } else
2328 sit_route_add(dev);
2329 }
2330 #endif
2331
2332 static inline int
2333 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2334 {
2335 struct in6_addr lladdr;
2336
2337 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2338 addrconf_add_linklocal(idev, &lladdr);
2339 return 0;
2340 }
2341 return -1;
2342 }
2343
2344 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2345 {
2346 struct net_device *link_dev;
2347 struct net *net = dev_net(idev->dev);
2348
2349 /* first try to inherit the link-local address from the link device */
2350 if (idev->dev->iflink &&
2351 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2352 if (!ipv6_inherit_linklocal(idev, link_dev))
2353 return;
2354 }
2355 /* then try to inherit it from any device */
2356 for_each_netdev(net, link_dev) {
2357 if (!ipv6_inherit_linklocal(idev, link_dev))
2358 return;
2359 }
2360 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2361 }
2362
2363 /*
2364 * Autoconfigure tunnel with a link-local address so routing protocols,
2365 * DHCPv6, MLD etc. can be run over the virtual link
2366 */
2367
2368 static void addrconf_ip6_tnl_config(struct net_device *dev)
2369 {
2370 struct inet6_dev *idev;
2371
2372 ASSERT_RTNL();
2373
2374 if ((idev = addrconf_add_dev(dev)) == NULL) {
2375 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2376 return;
2377 }
2378 ip6_tnl_add_linklocal(idev);
2379 }
2380
2381 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2382 void * data)
2383 {
2384 struct net_device *dev = (struct net_device *) data;
2385 struct inet6_dev *idev = __in6_dev_get(dev);
2386 int run_pending = 0;
2387 int err;
2388
2389 switch(event) {
2390 case NETDEV_REGISTER:
2391 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2392 idev = ipv6_add_dev(dev);
2393 if (!idev)
2394 return notifier_from_errno(-ENOMEM);
2395 }
2396 break;
2397 case NETDEV_UP:
2398 case NETDEV_CHANGE:
2399 if (dev->flags & IFF_SLAVE)
2400 break;
2401
2402 if (event == NETDEV_UP) {
2403 if (!addrconf_qdisc_ok(dev)) {
2404 /* device is not ready yet. */
2405 printk(KERN_INFO
2406 "ADDRCONF(NETDEV_UP): %s: "
2407 "link is not ready\n",
2408 dev->name);
2409 break;
2410 }
2411
2412 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2413 idev = ipv6_add_dev(dev);
2414
2415 if (idev)
2416 idev->if_flags |= IF_READY;
2417 } else {
2418 if (!addrconf_qdisc_ok(dev)) {
2419 /* device is still not ready. */
2420 break;
2421 }
2422
2423 if (idev) {
2424 if (idev->if_flags & IF_READY) {
2425 /* device is already configured. */
2426 break;
2427 }
2428 idev->if_flags |= IF_READY;
2429 }
2430
2431 printk(KERN_INFO
2432 "ADDRCONF(NETDEV_CHANGE): %s: "
2433 "link becomes ready\n",
2434 dev->name);
2435
2436 run_pending = 1;
2437 }
2438
2439 switch(dev->type) {
2440 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2441 case ARPHRD_SIT:
2442 addrconf_sit_config(dev);
2443 break;
2444 #endif
2445 case ARPHRD_TUNNEL6:
2446 addrconf_ip6_tnl_config(dev);
2447 break;
2448 case ARPHRD_LOOPBACK:
2449 init_loopback(dev);
2450 break;
2451
2452 default:
2453 addrconf_dev_config(dev);
2454 break;
2455 }
2456 if (idev) {
2457 if (run_pending)
2458 addrconf_dad_run(idev);
2459
2460 /* If the MTU changed during the interface down, when the
2461 interface up, the changed MTU must be reflected in the
2462 idev as well as routers.
2463 */
2464 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2465 rt6_mtu_change(dev, dev->mtu);
2466 idev->cnf.mtu6 = dev->mtu;
2467 }
2468 idev->tstamp = jiffies;
2469 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2470 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2471 stop IPv6 on this interface.
2472 */
2473 if (dev->mtu < IPV6_MIN_MTU)
2474 addrconf_ifdown(dev, event != NETDEV_DOWN);
2475 }
2476 break;
2477
2478 case NETDEV_CHANGEMTU:
2479 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2480 rt6_mtu_change(dev, dev->mtu);
2481 idev->cnf.mtu6 = dev->mtu;
2482 break;
2483 }
2484
2485 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2486 idev = ipv6_add_dev(dev);
2487 if (idev)
2488 break;
2489 }
2490
2491 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2492
2493 case NETDEV_DOWN:
2494 case NETDEV_UNREGISTER:
2495 /*
2496 * Remove all addresses from this interface.
2497 */
2498 addrconf_ifdown(dev, event != NETDEV_DOWN);
2499 break;
2500
2501 case NETDEV_CHANGENAME:
2502 if (idev) {
2503 snmp6_unregister_dev(idev);
2504 addrconf_sysctl_unregister(idev);
2505 addrconf_sysctl_register(idev);
2506 err = snmp6_register_dev(idev);
2507 if (err)
2508 return notifier_from_errno(err);
2509 }
2510 break;
2511 }
2512
2513 return NOTIFY_OK;
2514 }
2515
2516 /*
2517 * addrconf module should be notified of a device going up
2518 */
2519 static struct notifier_block ipv6_dev_notf = {
2520 .notifier_call = addrconf_notify,
2521 .priority = 0
2522 };
2523
2524 static int addrconf_ifdown(struct net_device *dev, int how)
2525 {
2526 struct inet6_dev *idev;
2527 struct inet6_ifaddr *ifa, **bifa;
2528 struct net *net = dev_net(dev);
2529 int i;
2530
2531 ASSERT_RTNL();
2532
2533 if ((dev->flags & IFF_LOOPBACK) && how == 1)
2534 how = 0;
2535
2536 rt6_ifdown(net, dev);
2537 neigh_ifdown(&nd_tbl, dev);
2538
2539 idev = __in6_dev_get(dev);
2540 if (idev == NULL)
2541 return -ENODEV;
2542
2543 /* Step 1: remove reference to ipv6 device from parent device.
2544 Do not dev_put!
2545 */
2546 if (how) {
2547 idev->dead = 1;
2548
2549 /* protected by rtnl_lock */
2550 rcu_assign_pointer(dev->ip6_ptr, NULL);
2551
2552 /* Step 1.5: remove snmp6 entry */
2553 snmp6_unregister_dev(idev);
2554
2555 }
2556
2557 /* Step 2: clear hash table */
2558 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2559 bifa = &inet6_addr_lst[i];
2560
2561 write_lock_bh(&addrconf_hash_lock);
2562 while ((ifa = *bifa) != NULL) {
2563 if (ifa->idev == idev) {
2564 *bifa = ifa->lst_next;
2565 ifa->lst_next = NULL;
2566 addrconf_del_timer(ifa);
2567 in6_ifa_put(ifa);
2568 continue;
2569 }
2570 bifa = &ifa->lst_next;
2571 }
2572 write_unlock_bh(&addrconf_hash_lock);
2573 }
2574
2575 write_lock_bh(&idev->lock);
2576
2577 /* Step 3: clear flags for stateless addrconf */
2578 if (!how)
2579 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2580
2581 /* Step 4: clear address list */
2582 #ifdef CONFIG_IPV6_PRIVACY
2583 if (how && del_timer(&idev->regen_timer))
2584 in6_dev_put(idev);
2585
2586 /* clear tempaddr list */
2587 while ((ifa = idev->tempaddr_list) != NULL) {
2588 idev->tempaddr_list = ifa->tmp_next;
2589 ifa->tmp_next = NULL;
2590 ifa->dead = 1;
2591 write_unlock_bh(&idev->lock);
2592 spin_lock_bh(&ifa->lock);
2593
2594 if (ifa->ifpub) {
2595 in6_ifa_put(ifa->ifpub);
2596 ifa->ifpub = NULL;
2597 }
2598 spin_unlock_bh(&ifa->lock);
2599 in6_ifa_put(ifa);
2600 write_lock_bh(&idev->lock);
2601 }
2602 #endif
2603 while ((ifa = idev->addr_list) != NULL) {
2604 idev->addr_list = ifa->if_next;
2605 ifa->if_next = NULL;
2606 ifa->dead = 1;
2607 addrconf_del_timer(ifa);
2608 write_unlock_bh(&idev->lock);
2609
2610 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2611 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2612 in6_ifa_put(ifa);
2613
2614 write_lock_bh(&idev->lock);
2615 }
2616 write_unlock_bh(&idev->lock);
2617
2618 /* Step 5: Discard multicast list */
2619
2620 if (how)
2621 ipv6_mc_destroy_dev(idev);
2622 else
2623 ipv6_mc_down(idev);
2624
2625 idev->tstamp = jiffies;
2626
2627 /* Shot the device (if unregistered) */
2628
2629 if (how) {
2630 addrconf_sysctl_unregister(idev);
2631 neigh_parms_release(&nd_tbl, idev->nd_parms);
2632 neigh_ifdown(&nd_tbl, dev);
2633 in6_dev_put(idev);
2634 }
2635 return 0;
2636 }
2637
2638 static void addrconf_rs_timer(unsigned long data)
2639 {
2640 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2641
2642 if (ifp->idev->cnf.forwarding)
2643 goto out;
2644
2645 if (ifp->idev->if_flags & IF_RA_RCVD) {
2646 /*
2647 * Announcement received after solicitation
2648 * was sent
2649 */
2650 goto out;
2651 }
2652
2653 spin_lock(&ifp->lock);
2654 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2655 /* The wait after the last probe can be shorter */
2656 addrconf_mod_timer(ifp, AC_RS,
2657 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2658 ifp->idev->cnf.rtr_solicit_delay :
2659 ifp->idev->cnf.rtr_solicit_interval);
2660 spin_unlock(&ifp->lock);
2661
2662 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2663 } else {
2664 spin_unlock(&ifp->lock);
2665 /*
2666 * Note: we do not support deprecated "all on-link"
2667 * assumption any longer.
2668 */
2669 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2670 ifp->idev->dev->name);
2671 }
2672
2673 out:
2674 in6_ifa_put(ifp);
2675 }
2676
2677 /*
2678 * Duplicate Address Detection
2679 */
2680 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2681 {
2682 unsigned long rand_num;
2683 struct inet6_dev *idev = ifp->idev;
2684
2685 if (ifp->flags & IFA_F_OPTIMISTIC)
2686 rand_num = 0;
2687 else
2688 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2689
2690 ifp->probes = idev->cnf.dad_transmits;
2691 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2692 }
2693
2694 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2695 {
2696 struct inet6_dev *idev = ifp->idev;
2697 struct net_device *dev = idev->dev;
2698
2699 addrconf_join_solict(dev, &ifp->addr);
2700
2701 net_srandom(ifp->addr.s6_addr32[3]);
2702
2703 read_lock_bh(&idev->lock);
2704 if (ifp->dead)
2705 goto out;
2706 spin_lock_bh(&ifp->lock);
2707
2708 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2709 !(ifp->flags&IFA_F_TENTATIVE) ||
2710 ifp->flags & IFA_F_NODAD) {
2711 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2712 spin_unlock_bh(&ifp->lock);
2713 read_unlock_bh(&idev->lock);
2714
2715 addrconf_dad_completed(ifp);
2716 return;
2717 }
2718
2719 if (!(idev->if_flags & IF_READY)) {
2720 spin_unlock_bh(&ifp->lock);
2721 read_unlock_bh(&idev->lock);
2722 /*
2723 * If the defice is not ready:
2724 * - keep it tentative if it is a permanent address.
2725 * - otherwise, kill it.
2726 */
2727 in6_ifa_hold(ifp);
2728 addrconf_dad_stop(ifp);
2729 return;
2730 }
2731
2732 /*
2733 * Optimistic nodes can start receiving
2734 * Frames right away
2735 */
2736 if(ifp->flags & IFA_F_OPTIMISTIC)
2737 ip6_ins_rt(ifp->rt);
2738
2739 addrconf_dad_kick(ifp);
2740 spin_unlock_bh(&ifp->lock);
2741 out:
2742 read_unlock_bh(&idev->lock);
2743 }
2744
2745 static void addrconf_dad_timer(unsigned long data)
2746 {
2747 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2748 struct inet6_dev *idev = ifp->idev;
2749 struct in6_addr mcaddr;
2750
2751 read_lock_bh(&idev->lock);
2752 if (idev->dead) {
2753 read_unlock_bh(&idev->lock);
2754 goto out;
2755 }
2756 spin_lock_bh(&ifp->lock);
2757 if (ifp->probes == 0) {
2758 /*
2759 * DAD was successful
2760 */
2761
2762 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2763 spin_unlock_bh(&ifp->lock);
2764 read_unlock_bh(&idev->lock);
2765
2766 addrconf_dad_completed(ifp);
2767
2768 goto out;
2769 }
2770
2771 ifp->probes--;
2772 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2773 spin_unlock_bh(&ifp->lock);
2774 read_unlock_bh(&idev->lock);
2775
2776 /* send a neighbour solicitation for our addr */
2777 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2778 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2779 out:
2780 in6_ifa_put(ifp);
2781 }
2782
2783 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2784 {
2785 struct net_device * dev = ifp->idev->dev;
2786
2787 /*
2788 * Configure the address for reception. Now it is valid.
2789 */
2790
2791 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2792
2793 /* If added prefix is link local and forwarding is off,
2794 start sending router solicitations.
2795 */
2796
2797 if (ifp->idev->cnf.forwarding == 0 &&
2798 ifp->idev->cnf.rtr_solicits > 0 &&
2799 (dev->flags&IFF_LOOPBACK) == 0 &&
2800 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2801 /*
2802 * If a host as already performed a random delay
2803 * [...] as part of DAD [...] there is no need
2804 * to delay again before sending the first RS
2805 */
2806 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2807
2808 spin_lock_bh(&ifp->lock);
2809 ifp->probes = 1;
2810 ifp->idev->if_flags |= IF_RS_SENT;
2811 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2812 spin_unlock_bh(&ifp->lock);
2813 }
2814 }
2815
2816 static void addrconf_dad_run(struct inet6_dev *idev) {
2817 struct inet6_ifaddr *ifp;
2818
2819 read_lock_bh(&idev->lock);
2820 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2821 spin_lock_bh(&ifp->lock);
2822 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2823 spin_unlock_bh(&ifp->lock);
2824 continue;
2825 }
2826 spin_unlock_bh(&ifp->lock);
2827 addrconf_dad_kick(ifp);
2828 }
2829 read_unlock_bh(&idev->lock);
2830 }
2831
2832 #ifdef CONFIG_PROC_FS
2833 struct if6_iter_state {
2834 struct seq_net_private p;
2835 int bucket;
2836 };
2837
2838 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2839 {
2840 struct inet6_ifaddr *ifa = NULL;
2841 struct if6_iter_state *state = seq->private;
2842 struct net *net = seq_file_net(seq);
2843
2844 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2845 ifa = inet6_addr_lst[state->bucket];
2846
2847 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2848 ifa = ifa->lst_next;
2849 if (ifa)
2850 break;
2851 }
2852 return ifa;
2853 }
2854
2855 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2856 {
2857 struct if6_iter_state *state = seq->private;
2858 struct net *net = seq_file_net(seq);
2859
2860 ifa = ifa->lst_next;
2861 try_again:
2862 if (ifa) {
2863 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2864 ifa = ifa->lst_next;
2865 goto try_again;
2866 }
2867 }
2868
2869 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2870 ifa = inet6_addr_lst[state->bucket];
2871 goto try_again;
2872 }
2873
2874 return ifa;
2875 }
2876
2877 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2878 {
2879 struct inet6_ifaddr *ifa = if6_get_first(seq);
2880
2881 if (ifa)
2882 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2883 --pos;
2884 return pos ? NULL : ifa;
2885 }
2886
2887 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2888 __acquires(addrconf_hash_lock)
2889 {
2890 read_lock_bh(&addrconf_hash_lock);
2891 return if6_get_idx(seq, *pos);
2892 }
2893
2894 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2895 {
2896 struct inet6_ifaddr *ifa;
2897
2898 ifa = if6_get_next(seq, v);
2899 ++*pos;
2900 return ifa;
2901 }
2902
2903 static void if6_seq_stop(struct seq_file *seq, void *v)
2904 __releases(addrconf_hash_lock)
2905 {
2906 read_unlock_bh(&addrconf_hash_lock);
2907 }
2908
2909 static int if6_seq_show(struct seq_file *seq, void *v)
2910 {
2911 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2912 seq_printf(seq,
2913 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2914 NIP6(ifp->addr),
2915 ifp->idev->dev->ifindex,
2916 ifp->prefix_len,
2917 ifp->scope,
2918 ifp->flags,
2919 ifp->idev->dev->name);
2920 return 0;
2921 }
2922
2923 static const struct seq_operations if6_seq_ops = {
2924 .start = if6_seq_start,
2925 .next = if6_seq_next,
2926 .show = if6_seq_show,
2927 .stop = if6_seq_stop,
2928 };
2929
2930 static int if6_seq_open(struct inode *inode, struct file *file)
2931 {
2932 return seq_open_net(inode, file, &if6_seq_ops,
2933 sizeof(struct if6_iter_state));
2934 }
2935
2936 static const struct file_operations if6_fops = {
2937 .owner = THIS_MODULE,
2938 .open = if6_seq_open,
2939 .read = seq_read,
2940 .llseek = seq_lseek,
2941 .release = seq_release_net,
2942 };
2943
2944 static int if6_proc_net_init(struct net *net)
2945 {
2946 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2947 return -ENOMEM;
2948 return 0;
2949 }
2950
2951 static void if6_proc_net_exit(struct net *net)
2952 {
2953 proc_net_remove(net, "if_inet6");
2954 }
2955
2956 static struct pernet_operations if6_proc_net_ops = {
2957 .init = if6_proc_net_init,
2958 .exit = if6_proc_net_exit,
2959 };
2960
2961 int __init if6_proc_init(void)
2962 {
2963 return register_pernet_subsys(&if6_proc_net_ops);
2964 }
2965
2966 void if6_proc_exit(void)
2967 {
2968 unregister_pernet_subsys(&if6_proc_net_ops);
2969 }
2970 #endif /* CONFIG_PROC_FS */
2971
2972 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2973 /* Check if address is a home address configured on any interface. */
2974 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2975 {
2976 int ret = 0;
2977 struct inet6_ifaddr * ifp;
2978 u8 hash = ipv6_addr_hash(addr);
2979 read_lock_bh(&addrconf_hash_lock);
2980 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2981 if (!net_eq(dev_net(ifp->idev->dev), net))
2982 continue;
2983 if (ipv6_addr_equal(&ifp->addr, addr) &&
2984 (ifp->flags & IFA_F_HOMEADDRESS)) {
2985 ret = 1;
2986 break;
2987 }
2988 }
2989 read_unlock_bh(&addrconf_hash_lock);
2990 return ret;
2991 }
2992 #endif
2993
2994 /*
2995 * Periodic address status verification
2996 */
2997
2998 static void addrconf_verify(unsigned long foo)
2999 {
3000 struct inet6_ifaddr *ifp;
3001 unsigned long now, next;
3002 int i;
3003
3004 spin_lock_bh(&addrconf_verify_lock);
3005 now = jiffies;
3006 next = now + ADDR_CHECK_FREQUENCY;
3007
3008 del_timer(&addr_chk_timer);
3009
3010 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3011
3012 restart:
3013 read_lock(&addrconf_hash_lock);
3014 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3015 unsigned long age;
3016 #ifdef CONFIG_IPV6_PRIVACY
3017 unsigned long regen_advance;
3018 #endif
3019
3020 if (ifp->flags & IFA_F_PERMANENT)
3021 continue;
3022
3023 spin_lock(&ifp->lock);
3024 age = (now - ifp->tstamp) / HZ;
3025
3026 #ifdef CONFIG_IPV6_PRIVACY
3027 regen_advance = ifp->idev->cnf.regen_max_retry *
3028 ifp->idev->cnf.dad_transmits *
3029 ifp->idev->nd_parms->retrans_time / HZ;
3030 #endif
3031
3032 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3033 age >= ifp->valid_lft) {
3034 spin_unlock(&ifp->lock);
3035 in6_ifa_hold(ifp);
3036 read_unlock(&addrconf_hash_lock);
3037 ipv6_del_addr(ifp);
3038 goto restart;
3039 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3040 spin_unlock(&ifp->lock);
3041 continue;
3042 } else if (age >= ifp->prefered_lft) {
3043 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3044 int deprecate = 0;
3045
3046 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3047 deprecate = 1;
3048 ifp->flags |= IFA_F_DEPRECATED;
3049 }
3050
3051 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3052 next = ifp->tstamp + ifp->valid_lft * HZ;
3053
3054 spin_unlock(&ifp->lock);
3055
3056 if (deprecate) {
3057 in6_ifa_hold(ifp);
3058 read_unlock(&addrconf_hash_lock);
3059
3060 ipv6_ifa_notify(0, ifp);
3061 in6_ifa_put(ifp);
3062 goto restart;
3063 }
3064 #ifdef CONFIG_IPV6_PRIVACY
3065 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3066 !(ifp->flags&IFA_F_TENTATIVE)) {
3067 if (age >= ifp->prefered_lft - regen_advance) {
3068 struct inet6_ifaddr *ifpub = ifp->ifpub;
3069 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3070 next = ifp->tstamp + ifp->prefered_lft * HZ;
3071 if (!ifp->regen_count && ifpub) {
3072 ifp->regen_count++;
3073 in6_ifa_hold(ifp);
3074 in6_ifa_hold(ifpub);
3075 spin_unlock(&ifp->lock);
3076 read_unlock(&addrconf_hash_lock);
3077 spin_lock(&ifpub->lock);
3078 ifpub->regen_count = 0;
3079 spin_unlock(&ifpub->lock);
3080 ipv6_create_tempaddr(ifpub, ifp);
3081 in6_ifa_put(ifpub);
3082 in6_ifa_put(ifp);
3083 goto restart;
3084 }
3085 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3086 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3087 spin_unlock(&ifp->lock);
3088 #endif
3089 } else {
3090 /* ifp->prefered_lft <= ifp->valid_lft */
3091 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3092 next = ifp->tstamp + ifp->prefered_lft * HZ;
3093 spin_unlock(&ifp->lock);
3094 }
3095 }
3096 read_unlock(&addrconf_hash_lock);
3097 }
3098
3099 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3100 add_timer(&addr_chk_timer);
3101 spin_unlock_bh(&addrconf_verify_lock);
3102 }
3103
3104 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3105 {
3106 struct in6_addr *pfx = NULL;
3107
3108 if (addr)
3109 pfx = nla_data(addr);
3110
3111 if (local) {
3112 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3113 pfx = NULL;
3114 else
3115 pfx = nla_data(local);
3116 }
3117
3118 return pfx;
3119 }
3120
3121 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3122 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3123 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3124 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3125 };
3126
3127 static int
3128 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3129 {
3130 struct net *net = sock_net(skb->sk);
3131 struct ifaddrmsg *ifm;
3132 struct nlattr *tb[IFA_MAX+1];
3133 struct in6_addr *pfx;
3134 int err;
3135
3136 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3137 if (err < 0)
3138 return err;
3139
3140 ifm = nlmsg_data(nlh);
3141 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3142 if (pfx == NULL)
3143 return -EINVAL;
3144
3145 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3146 }
3147
3148 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3149 u32 prefered_lft, u32 valid_lft)
3150 {
3151 u32 flags = RTF_EXPIRES;
3152
3153 if (!valid_lft || (prefered_lft > valid_lft))
3154 return -EINVAL;
3155
3156 if (valid_lft == INFINITY_LIFE_TIME) {
3157 ifa_flags |= IFA_F_PERMANENT;
3158 flags = 0;
3159 } else if (valid_lft >= 0x7FFFFFFF/HZ)
3160 valid_lft = 0x7FFFFFFF/HZ;
3161
3162 if (prefered_lft == 0)
3163 ifa_flags |= IFA_F_DEPRECATED;
3164 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3165 (prefered_lft != INFINITY_LIFE_TIME))
3166 prefered_lft = 0x7FFFFFFF/HZ;
3167
3168 spin_lock_bh(&ifp->lock);
3169 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3170 ifp->tstamp = jiffies;
3171 ifp->valid_lft = valid_lft;
3172 ifp->prefered_lft = prefered_lft;
3173
3174 spin_unlock_bh(&ifp->lock);
3175 if (!(ifp->flags&IFA_F_TENTATIVE))
3176 ipv6_ifa_notify(0, ifp);
3177
3178 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3179 jiffies_to_clock_t(valid_lft * HZ), flags);
3180 addrconf_verify(0);
3181
3182 return 0;
3183 }
3184
3185 static int
3186 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3187 {
3188 struct net *net = sock_net(skb->sk);
3189 struct ifaddrmsg *ifm;
3190 struct nlattr *tb[IFA_MAX+1];
3191 struct in6_addr *pfx;
3192 struct inet6_ifaddr *ifa;
3193 struct net_device *dev;
3194 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3195 u8 ifa_flags;
3196 int err;
3197
3198 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3199 if (err < 0)
3200 return err;
3201
3202 ifm = nlmsg_data(nlh);
3203 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3204 if (pfx == NULL)
3205 return -EINVAL;
3206
3207 if (tb[IFA_CACHEINFO]) {
3208 struct ifa_cacheinfo *ci;
3209
3210 ci = nla_data(tb[IFA_CACHEINFO]);
3211 valid_lft = ci->ifa_valid;
3212 preferred_lft = ci->ifa_prefered;
3213 } else {
3214 preferred_lft = INFINITY_LIFE_TIME;
3215 valid_lft = INFINITY_LIFE_TIME;
3216 }
3217
3218 dev = __dev_get_by_index(net, ifm->ifa_index);
3219 if (dev == NULL)
3220 return -ENODEV;
3221
3222 /* We ignore other flags so far. */
3223 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3224
3225 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3226 if (ifa == NULL) {
3227 /*
3228 * It would be best to check for !NLM_F_CREATE here but
3229 * userspace alreay relies on not having to provide this.
3230 */
3231 return inet6_addr_add(net, ifm->ifa_index, pfx,
3232 ifm->ifa_prefixlen, ifa_flags,
3233 preferred_lft, valid_lft);
3234 }
3235
3236 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3237 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3238 err = -EEXIST;
3239 else
3240 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3241
3242 in6_ifa_put(ifa);
3243
3244 return err;
3245 }
3246
3247 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3248 u8 scope, int ifindex)
3249 {
3250 struct ifaddrmsg *ifm;
3251
3252 ifm = nlmsg_data(nlh);
3253 ifm->ifa_family = AF_INET6;
3254 ifm->ifa_prefixlen = prefixlen;
3255 ifm->ifa_flags = flags;
3256 ifm->ifa_scope = scope;
3257 ifm->ifa_index = ifindex;
3258 }
3259
3260 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3261 unsigned long tstamp, u32 preferred, u32 valid)
3262 {
3263 struct ifa_cacheinfo ci;
3264
3265 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3266 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3267 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3268 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3269 ci.ifa_prefered = preferred;
3270 ci.ifa_valid = valid;
3271
3272 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3273 }
3274
3275 static inline int rt_scope(int ifa_scope)
3276 {
3277 if (ifa_scope & IFA_HOST)
3278 return RT_SCOPE_HOST;
3279 else if (ifa_scope & IFA_LINK)
3280 return RT_SCOPE_LINK;
3281 else if (ifa_scope & IFA_SITE)
3282 return RT_SCOPE_SITE;
3283 else
3284 return RT_SCOPE_UNIVERSE;
3285 }
3286
3287 static inline int inet6_ifaddr_msgsize(void)
3288 {
3289 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3290 + nla_total_size(16) /* IFA_ADDRESS */
3291 + nla_total_size(sizeof(struct ifa_cacheinfo));
3292 }
3293
3294 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3295 u32 pid, u32 seq, int event, unsigned int flags)
3296 {
3297 struct nlmsghdr *nlh;
3298 u32 preferred, valid;
3299
3300 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3301 if (nlh == NULL)
3302 return -EMSGSIZE;
3303
3304 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3305 ifa->idev->dev->ifindex);
3306
3307 if (!(ifa->flags&IFA_F_PERMANENT)) {
3308 preferred = ifa->prefered_lft;
3309 valid = ifa->valid_lft;
3310 if (preferred != INFINITY_LIFE_TIME) {
3311 long tval = (jiffies - ifa->tstamp)/HZ;
3312 preferred -= tval;
3313 if (valid != INFINITY_LIFE_TIME)
3314 valid -= tval;
3315 }
3316 } else {
3317 preferred = INFINITY_LIFE_TIME;
3318 valid = INFINITY_LIFE_TIME;
3319 }
3320
3321 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3322 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3323 nlmsg_cancel(skb, nlh);
3324 return -EMSGSIZE;
3325 }
3326
3327 return nlmsg_end(skb, nlh);
3328 }
3329
3330 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3331 u32 pid, u32 seq, int event, u16 flags)
3332 {
3333 struct nlmsghdr *nlh;
3334 u8 scope = RT_SCOPE_UNIVERSE;
3335 int ifindex = ifmca->idev->dev->ifindex;
3336
3337 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3338 scope = RT_SCOPE_SITE;
3339
3340 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3341 if (nlh == NULL)
3342 return -EMSGSIZE;
3343
3344 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3345 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3346 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3347 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3348 nlmsg_cancel(skb, nlh);
3349 return -EMSGSIZE;
3350 }
3351
3352 return nlmsg_end(skb, nlh);
3353 }
3354
3355 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3356 u32 pid, u32 seq, int event, unsigned int flags)
3357 {
3358 struct nlmsghdr *nlh;
3359 u8 scope = RT_SCOPE_UNIVERSE;
3360 int ifindex = ifaca->aca_idev->dev->ifindex;
3361
3362 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3363 scope = RT_SCOPE_SITE;
3364
3365 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3366 if (nlh == NULL)
3367 return -EMSGSIZE;
3368
3369 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3370 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3371 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3372 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3373 nlmsg_cancel(skb, nlh);
3374 return -EMSGSIZE;
3375 }
3376
3377 return nlmsg_end(skb, nlh);
3378 }
3379
3380 enum addr_type_t
3381 {
3382 UNICAST_ADDR,
3383 MULTICAST_ADDR,
3384 ANYCAST_ADDR,
3385 };
3386
3387 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3388 enum addr_type_t type)
3389 {
3390 int idx, ip_idx;
3391 int s_idx, s_ip_idx;
3392 int err = 1;
3393 struct net_device *dev;
3394 struct inet6_dev *idev = NULL;
3395 struct inet6_ifaddr *ifa;
3396 struct ifmcaddr6 *ifmca;
3397 struct ifacaddr6 *ifaca;
3398 struct net *net = sock_net(skb->sk);
3399
3400 s_idx = cb->args[0];
3401 s_ip_idx = ip_idx = cb->args[1];
3402
3403 idx = 0;
3404 for_each_netdev(net, dev) {
3405 if (idx < s_idx)
3406 goto cont;
3407 if (idx > s_idx)
3408 s_ip_idx = 0;
3409 ip_idx = 0;
3410 if ((idev = in6_dev_get(dev)) == NULL)
3411 goto cont;
3412 read_lock_bh(&idev->lock);
3413 switch (type) {
3414 case UNICAST_ADDR:
3415 /* unicast address incl. temp addr */
3416 for (ifa = idev->addr_list; ifa;
3417 ifa = ifa->if_next, ip_idx++) {
3418 if (ip_idx < s_ip_idx)
3419 continue;
3420 err = inet6_fill_ifaddr(skb, ifa,
3421 NETLINK_CB(cb->skb).pid,
3422 cb->nlh->nlmsg_seq,
3423 RTM_NEWADDR,
3424 NLM_F_MULTI);
3425 }
3426 break;
3427 case MULTICAST_ADDR:
3428 /* multicast address */
3429 for (ifmca = idev->mc_list; ifmca;
3430 ifmca = ifmca->next, ip_idx++) {
3431 if (ip_idx < s_ip_idx)
3432 continue;
3433 err = inet6_fill_ifmcaddr(skb, ifmca,
3434 NETLINK_CB(cb->skb).pid,
3435 cb->nlh->nlmsg_seq,
3436 RTM_GETMULTICAST,
3437 NLM_F_MULTI);
3438 }
3439 break;
3440 case ANYCAST_ADDR:
3441 /* anycast address */
3442 for (ifaca = idev->ac_list; ifaca;
3443 ifaca = ifaca->aca_next, ip_idx++) {
3444 if (ip_idx < s_ip_idx)
3445 continue;
3446 err = inet6_fill_ifacaddr(skb, ifaca,
3447 NETLINK_CB(cb->skb).pid,
3448 cb->nlh->nlmsg_seq,
3449 RTM_GETANYCAST,
3450 NLM_F_MULTI);
3451 }
3452 break;
3453 default:
3454 break;
3455 }
3456 read_unlock_bh(&idev->lock);
3457 in6_dev_put(idev);
3458
3459 if (err <= 0)
3460 break;
3461 cont:
3462 idx++;
3463 }
3464 cb->args[0] = idx;
3465 cb->args[1] = ip_idx;
3466 return skb->len;
3467 }
3468
3469 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3470 {
3471 enum addr_type_t type = UNICAST_ADDR;
3472
3473 return inet6_dump_addr(skb, cb, type);
3474 }
3475
3476 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3477 {
3478 enum addr_type_t type = MULTICAST_ADDR;
3479
3480 return inet6_dump_addr(skb, cb, type);
3481 }
3482
3483
3484 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3485 {
3486 enum addr_type_t type = ANYCAST_ADDR;
3487
3488 return inet6_dump_addr(skb, cb, type);
3489 }
3490
3491 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3492 void *arg)
3493 {
3494 struct net *net = sock_net(in_skb->sk);
3495 struct ifaddrmsg *ifm;
3496 struct nlattr *tb[IFA_MAX+1];
3497 struct in6_addr *addr = NULL;
3498 struct net_device *dev = NULL;
3499 struct inet6_ifaddr *ifa;
3500 struct sk_buff *skb;
3501 int err;
3502
3503 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3504 if (err < 0)
3505 goto errout;
3506
3507 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3508 if (addr == NULL) {
3509 err = -EINVAL;
3510 goto errout;
3511 }
3512
3513 ifm = nlmsg_data(nlh);
3514 if (ifm->ifa_index)
3515 dev = __dev_get_by_index(net, ifm->ifa_index);
3516
3517 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3518 err = -EADDRNOTAVAIL;
3519 goto errout;
3520 }
3521
3522 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3523 err = -ENOBUFS;
3524 goto errout_ifa;
3525 }
3526
3527 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3528 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3529 if (err < 0) {
3530 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3531 WARN_ON(err == -EMSGSIZE);
3532 kfree_skb(skb);
3533 goto errout_ifa;
3534 }
3535 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3536 errout_ifa:
3537 in6_ifa_put(ifa);
3538 errout:
3539 return err;
3540 }
3541
3542 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3543 {
3544 struct sk_buff *skb;
3545 struct net *net = dev_net(ifa->idev->dev);
3546 int err = -ENOBUFS;
3547
3548 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3549 if (skb == NULL)
3550 goto errout;
3551
3552 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3553 if (err < 0) {
3554 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3555 WARN_ON(err == -EMSGSIZE);
3556 kfree_skb(skb);
3557 goto errout;
3558 }
3559 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3560 errout:
3561 if (err < 0)
3562 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3563 }
3564
3565 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3566 __s32 *array, int bytes)
3567 {
3568 BUG_ON(bytes < (DEVCONF_MAX * 4));
3569
3570 memset(array, 0, bytes);
3571 array[DEVCONF_FORWARDING] = cnf->forwarding;
3572 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3573 array[DEVCONF_MTU6] = cnf->mtu6;
3574 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3575 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3576 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3577 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3578 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3579 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3580 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3581 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3582 #ifdef CONFIG_IPV6_PRIVACY
3583 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3584 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3585 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3586 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3587 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3588 #endif
3589 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3590 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3591 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3592 #ifdef CONFIG_IPV6_ROUTER_PREF
3593 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3594 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3595 #ifdef CONFIG_IPV6_ROUTE_INFO
3596 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3597 #endif
3598 #endif
3599 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3600 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3601 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3602 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3603 #endif
3604 #ifdef CONFIG_IPV6_MROUTE
3605 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3606 #endif
3607 }
3608
3609 static inline size_t inet6_if_nlmsg_size(void)
3610 {
3611 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3612 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3613 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3614 + nla_total_size(4) /* IFLA_MTU */
3615 + nla_total_size(4) /* IFLA_LINK */
3616 + nla_total_size( /* IFLA_PROTINFO */
3617 nla_total_size(4) /* IFLA_INET6_FLAGS */
3618 + nla_total_size(sizeof(struct ifla_cacheinfo))
3619 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3620 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3621 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3622 );
3623 }
3624
3625 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3626 int bytes)
3627 {
3628 int i;
3629 int pad = bytes - sizeof(u64) * items;
3630 BUG_ON(pad < 0);
3631
3632 /* Use put_unaligned() because stats may not be aligned for u64. */
3633 put_unaligned(items, &stats[0]);
3634 for (i = 1; i < items; i++)
3635 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3636
3637 memset(&stats[items], 0, pad);
3638 }
3639
3640 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3641 int bytes)
3642 {
3643 switch(attrtype) {
3644 case IFLA_INET6_STATS:
3645 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3646 break;
3647 case IFLA_INET6_ICMP6STATS:
3648 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3649 break;
3650 }
3651 }
3652
3653 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3654 u32 pid, u32 seq, int event, unsigned int flags)
3655 {
3656 struct net_device *dev = idev->dev;
3657 struct nlattr *nla;
3658 struct ifinfomsg *hdr;
3659 struct nlmsghdr *nlh;
3660 void *protoinfo;
3661 struct ifla_cacheinfo ci;
3662
3663 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3664 if (nlh == NULL)
3665 return -EMSGSIZE;
3666
3667 hdr = nlmsg_data(nlh);
3668 hdr->ifi_family = AF_INET6;
3669 hdr->__ifi_pad = 0;
3670 hdr->ifi_type = dev->type;
3671 hdr->ifi_index = dev->ifindex;
3672 hdr->ifi_flags = dev_get_flags(dev);
3673 hdr->ifi_change = 0;
3674
3675 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3676
3677 if (dev->addr_len)
3678 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3679
3680 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3681 if (dev->ifindex != dev->iflink)
3682 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3683
3684 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3685 if (protoinfo == NULL)
3686 goto nla_put_failure;
3687
3688 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3689
3690 ci.max_reasm_len = IPV6_MAXPLEN;
3691 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3692 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3693 ci.reachable_time = idev->nd_parms->reachable_time;
3694 ci.retrans_time = idev->nd_parms->retrans_time;
3695 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3696
3697 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3698 if (nla == NULL)
3699 goto nla_put_failure;
3700 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3701
3702 /* XXX - MC not implemented */
3703
3704 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3705 if (nla == NULL)
3706 goto nla_put_failure;
3707 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3708
3709 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3710 if (nla == NULL)
3711 goto nla_put_failure;
3712 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3713
3714 nla_nest_end(skb, protoinfo);
3715 return nlmsg_end(skb, nlh);
3716
3717 nla_put_failure:
3718 nlmsg_cancel(skb, nlh);
3719 return -EMSGSIZE;
3720 }
3721
3722 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3723 {
3724 struct net *net = sock_net(skb->sk);
3725 int idx, err;
3726 int s_idx = cb->args[0];
3727 struct net_device *dev;
3728 struct inet6_dev *idev;
3729
3730 read_lock(&dev_base_lock);
3731 idx = 0;
3732 for_each_netdev(net, dev) {
3733 if (idx < s_idx)
3734 goto cont;
3735 if ((idev = in6_dev_get(dev)) == NULL)
3736 goto cont;
3737 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3738 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3739 in6_dev_put(idev);
3740 if (err <= 0)
3741 break;
3742 cont:
3743 idx++;
3744 }
3745 read_unlock(&dev_base_lock);
3746 cb->args[0] = idx;
3747
3748 return skb->len;
3749 }
3750
3751 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3752 {
3753 struct sk_buff *skb;
3754 struct net *net = dev_net(idev->dev);
3755 int err = -ENOBUFS;
3756
3757 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3758 if (skb == NULL)
3759 goto errout;
3760
3761 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3762 if (err < 0) {
3763 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3764 WARN_ON(err == -EMSGSIZE);
3765 kfree_skb(skb);
3766 goto errout;
3767 }
3768 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3769 errout:
3770 if (err < 0)
3771 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3772 }
3773
3774 static inline size_t inet6_prefix_nlmsg_size(void)
3775 {
3776 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3777 + nla_total_size(sizeof(struct in6_addr))
3778 + nla_total_size(sizeof(struct prefix_cacheinfo));
3779 }
3780
3781 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3782 struct prefix_info *pinfo, u32 pid, u32 seq,
3783 int event, unsigned int flags)
3784 {
3785 struct prefixmsg *pmsg;
3786 struct nlmsghdr *nlh;
3787 struct prefix_cacheinfo ci;
3788
3789 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3790 if (nlh == NULL)
3791 return -EMSGSIZE;
3792
3793 pmsg = nlmsg_data(nlh);
3794 pmsg->prefix_family = AF_INET6;
3795 pmsg->prefix_pad1 = 0;
3796 pmsg->prefix_pad2 = 0;
3797 pmsg->prefix_ifindex = idev->dev->ifindex;
3798 pmsg->prefix_len = pinfo->prefix_len;
3799 pmsg->prefix_type = pinfo->type;
3800 pmsg->prefix_pad3 = 0;
3801 pmsg->prefix_flags = 0;
3802 if (pinfo->onlink)
3803 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3804 if (pinfo->autoconf)
3805 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3806
3807 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3808
3809 ci.preferred_time = ntohl(pinfo->prefered);
3810 ci.valid_time = ntohl(pinfo->valid);
3811 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3812
3813 return nlmsg_end(skb, nlh);
3814
3815 nla_put_failure:
3816 nlmsg_cancel(skb, nlh);
3817 return -EMSGSIZE;
3818 }
3819
3820 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3821 struct prefix_info *pinfo)
3822 {
3823 struct sk_buff *skb;
3824 struct net *net = dev_net(idev->dev);
3825 int err = -ENOBUFS;
3826
3827 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3828 if (skb == NULL)
3829 goto errout;
3830
3831 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3832 if (err < 0) {
3833 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3834 WARN_ON(err == -EMSGSIZE);
3835 kfree_skb(skb);
3836 goto errout;
3837 }
3838 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3839 errout:
3840 if (err < 0)
3841 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3842 }
3843
3844 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3845 {
3846 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3847
3848 switch (event) {
3849 case RTM_NEWADDR:
3850 /*
3851 * If the address was optimistic
3852 * we inserted the route at the start of
3853 * our DAD process, so we don't need
3854 * to do it again
3855 */
3856 if (!(ifp->rt->rt6i_node))
3857 ip6_ins_rt(ifp->rt);
3858 if (ifp->idev->cnf.forwarding)
3859 addrconf_join_anycast(ifp);
3860 break;
3861 case RTM_DELADDR:
3862 if (ifp->idev->cnf.forwarding)
3863 addrconf_leave_anycast(ifp);
3864 addrconf_leave_solict(ifp->idev, &ifp->addr);
3865 dst_hold(&ifp->rt->u.dst);
3866 if (ip6_del_rt(ifp->rt))
3867 dst_free(&ifp->rt->u.dst);
3868 break;
3869 }
3870 }
3871
3872 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3873 {
3874 rcu_read_lock_bh();
3875 if (likely(ifp->idev->dead == 0))
3876 __ipv6_ifa_notify(event, ifp);
3877 rcu_read_unlock_bh();
3878 }
3879
3880 #ifdef CONFIG_SYSCTL
3881
3882 static
3883 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3884 void __user *buffer, size_t *lenp, loff_t *ppos)
3885 {
3886 int *valp = ctl->data;
3887 int val = *valp;
3888 int ret;
3889
3890 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3891
3892 if (write)
3893 addrconf_fixup_forwarding(ctl, valp, val);
3894 return ret;
3895 }
3896
3897 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3898 int __user *name, int nlen,
3899 void __user *oldval,
3900 size_t __user *oldlenp,
3901 void __user *newval, size_t newlen)
3902 {
3903 int *valp = table->data;
3904 int val = *valp;
3905 int new;
3906
3907 if (!newval || !newlen)
3908 return 0;
3909 if (newlen != sizeof(int))
3910 return -EINVAL;
3911 if (get_user(new, (int __user *)newval))
3912 return -EFAULT;
3913 if (new == *valp)
3914 return 0;
3915 if (oldval && oldlenp) {
3916 size_t len;
3917 if (get_user(len, oldlenp))
3918 return -EFAULT;
3919 if (len) {
3920 if (len > table->maxlen)
3921 len = table->maxlen;
3922 if (copy_to_user(oldval, valp, len))
3923 return -EFAULT;
3924 if (put_user(len, oldlenp))
3925 return -EFAULT;
3926 }
3927 }
3928
3929 *valp = new;
3930 addrconf_fixup_forwarding(table, valp, val);
3931 return 1;
3932 }
3933
3934 static struct addrconf_sysctl_table
3935 {
3936 struct ctl_table_header *sysctl_header;
3937 ctl_table addrconf_vars[DEVCONF_MAX+1];
3938 char *dev_name;
3939 } addrconf_sysctl __read_mostly = {
3940 .sysctl_header = NULL,
3941 .addrconf_vars = {
3942 {
3943 .ctl_name = NET_IPV6_FORWARDING,
3944 .procname = "forwarding",
3945 .data = &ipv6_devconf.forwarding,
3946 .maxlen = sizeof(int),
3947 .mode = 0644,
3948 .proc_handler = &addrconf_sysctl_forward,
3949 .strategy = &addrconf_sysctl_forward_strategy,
3950 },
3951 {
3952 .ctl_name = NET_IPV6_HOP_LIMIT,
3953 .procname = "hop_limit",
3954 .data = &ipv6_devconf.hop_limit,
3955 .maxlen = sizeof(int),
3956 .mode = 0644,
3957 .proc_handler = proc_dointvec,
3958 },
3959 {
3960 .ctl_name = NET_IPV6_MTU,
3961 .procname = "mtu",
3962 .data = &ipv6_devconf.mtu6,
3963 .maxlen = sizeof(int),
3964 .mode = 0644,
3965 .proc_handler = &proc_dointvec,
3966 },
3967 {
3968 .ctl_name = NET_IPV6_ACCEPT_RA,
3969 .procname = "accept_ra",
3970 .data = &ipv6_devconf.accept_ra,
3971 .maxlen = sizeof(int),
3972 .mode = 0644,
3973 .proc_handler = &proc_dointvec,
3974 },
3975 {
3976 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3977 .procname = "accept_redirects",
3978 .data = &ipv6_devconf.accept_redirects,
3979 .maxlen = sizeof(int),
3980 .mode = 0644,
3981 .proc_handler = &proc_dointvec,
3982 },
3983 {
3984 .ctl_name = NET_IPV6_AUTOCONF,
3985 .procname = "autoconf",
3986 .data = &ipv6_devconf.autoconf,
3987 .maxlen = sizeof(int),
3988 .mode = 0644,
3989 .proc_handler = &proc_dointvec,
3990 },
3991 {
3992 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3993 .procname = "dad_transmits",
3994 .data = &ipv6_devconf.dad_transmits,
3995 .maxlen = sizeof(int),
3996 .mode = 0644,
3997 .proc_handler = &proc_dointvec,
3998 },
3999 {
4000 .ctl_name = NET_IPV6_RTR_SOLICITS,
4001 .procname = "router_solicitations",
4002 .data = &ipv6_devconf.rtr_solicits,
4003 .maxlen = sizeof(int),
4004 .mode = 0644,
4005 .proc_handler = &proc_dointvec,
4006 },
4007 {
4008 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
4009 .procname = "router_solicitation_interval",
4010 .data = &ipv6_devconf.rtr_solicit_interval,
4011 .maxlen = sizeof(int),
4012 .mode = 0644,
4013 .proc_handler = &proc_dointvec_jiffies,
4014 .strategy = &sysctl_jiffies,
4015 },
4016 {
4017 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
4018 .procname = "router_solicitation_delay",
4019 .data = &ipv6_devconf.rtr_solicit_delay,
4020 .maxlen = sizeof(int),
4021 .mode = 0644,
4022 .proc_handler = &proc_dointvec_jiffies,
4023 .strategy = &sysctl_jiffies,
4024 },
4025 {
4026 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
4027 .procname = "force_mld_version",
4028 .data = &ipv6_devconf.force_mld_version,
4029 .maxlen = sizeof(int),
4030 .mode = 0644,
4031 .proc_handler = &proc_dointvec,
4032 },
4033 #ifdef CONFIG_IPV6_PRIVACY
4034 {
4035 .ctl_name = NET_IPV6_USE_TEMPADDR,
4036 .procname = "use_tempaddr",
4037 .data = &ipv6_devconf.use_tempaddr,
4038 .maxlen = sizeof(int),
4039 .mode = 0644,
4040 .proc_handler = &proc_dointvec,
4041 },
4042 {
4043 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
4044 .procname = "temp_valid_lft",
4045 .data = &ipv6_devconf.temp_valid_lft,
4046 .maxlen = sizeof(int),
4047 .mode = 0644,
4048 .proc_handler = &proc_dointvec,
4049 },
4050 {
4051 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4052 .procname = "temp_prefered_lft",
4053 .data = &ipv6_devconf.temp_prefered_lft,
4054 .maxlen = sizeof(int),
4055 .mode = 0644,
4056 .proc_handler = &proc_dointvec,
4057 },
4058 {
4059 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4060 .procname = "regen_max_retry",
4061 .data = &ipv6_devconf.regen_max_retry,
4062 .maxlen = sizeof(int),
4063 .mode = 0644,
4064 .proc_handler = &proc_dointvec,
4065 },
4066 {
4067 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4068 .procname = "max_desync_factor",
4069 .data = &ipv6_devconf.max_desync_factor,
4070 .maxlen = sizeof(int),
4071 .mode = 0644,
4072 .proc_handler = &proc_dointvec,
4073 },
4074 #endif
4075 {
4076 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4077 .procname = "max_addresses",
4078 .data = &ipv6_devconf.max_addresses,
4079 .maxlen = sizeof(int),
4080 .mode = 0644,
4081 .proc_handler = &proc_dointvec,
4082 },
4083 {
4084 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4085 .procname = "accept_ra_defrtr",
4086 .data = &ipv6_devconf.accept_ra_defrtr,
4087 .maxlen = sizeof(int),
4088 .mode = 0644,
4089 .proc_handler = &proc_dointvec,
4090 },
4091 {
4092 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4093 .procname = "accept_ra_pinfo",
4094 .data = &ipv6_devconf.accept_ra_pinfo,
4095 .maxlen = sizeof(int),
4096 .mode = 0644,
4097 .proc_handler = &proc_dointvec,
4098 },
4099 #ifdef CONFIG_IPV6_ROUTER_PREF
4100 {
4101 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4102 .procname = "accept_ra_rtr_pref",
4103 .data = &ipv6_devconf.accept_ra_rtr_pref,
4104 .maxlen = sizeof(int),
4105 .mode = 0644,
4106 .proc_handler = &proc_dointvec,
4107 },
4108 {
4109 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4110 .procname = "router_probe_interval",
4111 .data = &ipv6_devconf.rtr_probe_interval,
4112 .maxlen = sizeof(int),
4113 .mode = 0644,
4114 .proc_handler = &proc_dointvec_jiffies,
4115 .strategy = &sysctl_jiffies,
4116 },
4117 #ifdef CONFIG_IPV6_ROUTE_INFO
4118 {
4119 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4120 .procname = "accept_ra_rt_info_max_plen",
4121 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4122 .maxlen = sizeof(int),
4123 .mode = 0644,
4124 .proc_handler = &proc_dointvec,
4125 },
4126 #endif
4127 #endif
4128 {
4129 .ctl_name = NET_IPV6_PROXY_NDP,
4130 .procname = "proxy_ndp",
4131 .data = &ipv6_devconf.proxy_ndp,
4132 .maxlen = sizeof(int),
4133 .mode = 0644,
4134 .proc_handler = &proc_dointvec,
4135 },
4136 {
4137 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4138 .procname = "accept_source_route",
4139 .data = &ipv6_devconf.accept_source_route,
4140 .maxlen = sizeof(int),
4141 .mode = 0644,
4142 .proc_handler = &proc_dointvec,
4143 },
4144 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4145 {
4146 .ctl_name = CTL_UNNUMBERED,
4147 .procname = "optimistic_dad",
4148 .data = &ipv6_devconf.optimistic_dad,
4149 .maxlen = sizeof(int),
4150 .mode = 0644,
4151 .proc_handler = &proc_dointvec,
4152
4153 },
4154 #endif
4155 #ifdef CONFIG_IPV6_MROUTE
4156 {
4157 .ctl_name = CTL_UNNUMBERED,
4158 .procname = "mc_forwarding",
4159 .data = &ipv6_devconf.mc_forwarding,
4160 .maxlen = sizeof(int),
4161 .mode = 0644,
4162 .proc_handler = &proc_dointvec,
4163 },
4164 #endif
4165 {
4166 .ctl_name = 0, /* sentinel */
4167 }
4168 },
4169 };
4170
4171 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4172 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4173 {
4174 int i;
4175 struct addrconf_sysctl_table *t;
4176
4177 #define ADDRCONF_CTL_PATH_DEV 3
4178
4179 struct ctl_path addrconf_ctl_path[] = {
4180 { .procname = "net", .ctl_name = CTL_NET, },
4181 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4182 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4183 { /* to be set */ },
4184 { },
4185 };
4186
4187
4188 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4189 if (t == NULL)
4190 goto out;
4191
4192 for (i=0; t->addrconf_vars[i].data; i++) {
4193 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4194 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4195 t->addrconf_vars[i].extra2 = net;
4196 }
4197
4198 /*
4199 * Make a copy of dev_name, because '.procname' is regarded as const
4200 * by sysctl and we wouldn't want anyone to change it under our feet
4201 * (see SIOCSIFNAME).
4202 */
4203 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4204 if (!t->dev_name)
4205 goto free;
4206
4207 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4208 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4209
4210 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4211 t->addrconf_vars);
4212 if (t->sysctl_header == NULL)
4213 goto free_procname;
4214
4215 p->sysctl = t;
4216 return 0;
4217
4218 free_procname:
4219 kfree(t->dev_name);
4220 free:
4221 kfree(t);
4222 out:
4223 return -ENOBUFS;
4224 }
4225
4226 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4227 {
4228 struct addrconf_sysctl_table *t;
4229
4230 if (p->sysctl == NULL)
4231 return;
4232
4233 t = p->sysctl;
4234 p->sysctl = NULL;
4235 unregister_sysctl_table(t->sysctl_header);
4236 kfree(t->dev_name);
4237 kfree(t);
4238 }
4239
4240 static void addrconf_sysctl_register(struct inet6_dev *idev)
4241 {
4242 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4243 NET_IPV6_NEIGH, "ipv6",
4244 &ndisc_ifinfo_sysctl_change,
4245 NULL);
4246 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4247 idev->dev->ifindex, idev, &idev->cnf);
4248 }
4249
4250 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4251 {
4252 __addrconf_sysctl_unregister(&idev->cnf);
4253 neigh_sysctl_unregister(idev->nd_parms);
4254 }
4255
4256
4257 #endif
4258
4259 static int addrconf_init_net(struct net *net)
4260 {
4261 int err;
4262 struct ipv6_devconf *all, *dflt;
4263
4264 err = -ENOMEM;
4265 all = &ipv6_devconf;
4266 dflt = &ipv6_devconf_dflt;
4267
4268 if (net != &init_net) {
4269 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4270 if (all == NULL)
4271 goto err_alloc_all;
4272
4273 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4274 if (dflt == NULL)
4275 goto err_alloc_dflt;
4276 }
4277
4278 net->ipv6.devconf_all = all;
4279 net->ipv6.devconf_dflt = dflt;
4280
4281 #ifdef CONFIG_SYSCTL
4282 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4283 NULL, all);
4284 if (err < 0)
4285 goto err_reg_all;
4286
4287 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4288 NULL, dflt);
4289 if (err < 0)
4290 goto err_reg_dflt;
4291 #endif
4292 return 0;
4293
4294 #ifdef CONFIG_SYSCTL
4295 err_reg_dflt:
4296 __addrconf_sysctl_unregister(all);
4297 err_reg_all:
4298 kfree(dflt);
4299 #endif
4300 err_alloc_dflt:
4301 kfree(all);
4302 err_alloc_all:
4303 return err;
4304 }
4305
4306 static void addrconf_exit_net(struct net *net)
4307 {
4308 #ifdef CONFIG_SYSCTL
4309 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4310 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4311 #endif
4312 if (net != &init_net) {
4313 kfree(net->ipv6.devconf_dflt);
4314 kfree(net->ipv6.devconf_all);
4315 }
4316 }
4317
4318 static struct pernet_operations addrconf_ops = {
4319 .init = addrconf_init_net,
4320 .exit = addrconf_exit_net,
4321 };
4322
4323 /*
4324 * Device notifier
4325 */
4326
4327 int register_inet6addr_notifier(struct notifier_block *nb)
4328 {
4329 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4330 }
4331
4332 EXPORT_SYMBOL(register_inet6addr_notifier);
4333
4334 int unregister_inet6addr_notifier(struct notifier_block *nb)
4335 {
4336 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4337 }
4338
4339 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4340
4341 static void addrconf_net_exit(struct net *net)
4342 {
4343 struct net_device *dev;
4344
4345 rtnl_lock();
4346 /* clean dev list */
4347 for_each_netdev(net, dev) {
4348 if (__in6_dev_get(dev) == NULL)
4349 continue;
4350 addrconf_ifdown(dev, 1);
4351 }
4352 addrconf_ifdown(net->loopback_dev, 2);
4353 rtnl_unlock();
4354 }
4355
4356 static struct pernet_operations addrconf_net_ops = {
4357 .exit = addrconf_net_exit,
4358 };
4359
4360 /*
4361 * Init / cleanup code
4362 */
4363
4364 int __init addrconf_init(void)
4365 {
4366 int err;
4367
4368 if ((err = ipv6_addr_label_init()) < 0) {
4369 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4370 err);
4371 return err;
4372 }
4373
4374 register_pernet_subsys(&addrconf_ops);
4375
4376 /* The addrconf netdev notifier requires that loopback_dev
4377 * has it's ipv6 private information allocated and setup
4378 * before it can bring up and give link-local addresses
4379 * to other devices which are up.
4380 *
4381 * Unfortunately, loopback_dev is not necessarily the first
4382 * entry in the global dev_base list of net devices. In fact,
4383 * it is likely to be the very last entry on that list.
4384 * So this causes the notifier registry below to try and
4385 * give link-local addresses to all devices besides loopback_dev
4386 * first, then loopback_dev, which cases all the non-loopback_dev
4387 * devices to fail to get a link-local address.
4388 *
4389 * So, as a temporary fix, allocate the ipv6 structure for
4390 * loopback_dev first by hand.
4391 * Longer term, all of the dependencies ipv6 has upon the loopback
4392 * device and it being up should be removed.
4393 */
4394 rtnl_lock();
4395 if (!ipv6_add_dev(init_net.loopback_dev))
4396 err = -ENOMEM;
4397 rtnl_unlock();
4398 if (err)
4399 goto errlo;
4400
4401 err = register_pernet_device(&addrconf_net_ops);
4402 if (err)
4403 return err;
4404
4405 register_netdevice_notifier(&ipv6_dev_notf);
4406
4407 addrconf_verify(0);
4408
4409 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4410 if (err < 0)
4411 goto errout;
4412
4413 /* Only the first call to __rtnl_register can fail */
4414 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4415 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4416 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4417 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4418 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4419
4420 ipv6_addr_label_rtnl_register();
4421
4422 return 0;
4423 errout:
4424 unregister_netdevice_notifier(&ipv6_dev_notf);
4425 errlo:
4426 unregister_pernet_subsys(&addrconf_ops);
4427
4428 return err;
4429 }
4430
4431 void addrconf_cleanup(void)
4432 {
4433 struct inet6_ifaddr *ifa;
4434 int i;
4435
4436 unregister_netdevice_notifier(&ipv6_dev_notf);
4437 unregister_pernet_device(&addrconf_net_ops);
4438
4439 unregister_pernet_subsys(&addrconf_ops);
4440
4441 rtnl_lock();
4442
4443 /*
4444 * Check hash table.
4445 */
4446 write_lock_bh(&addrconf_hash_lock);
4447 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4448 for (ifa=inet6_addr_lst[i]; ifa; ) {
4449 struct inet6_ifaddr *bifa;
4450
4451 bifa = ifa;
4452 ifa = ifa->lst_next;
4453 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4454 /* Do not free it; something is wrong.
4455 Now we can investigate it with debugger.
4456 */
4457 }
4458 }
4459 write_unlock_bh(&addrconf_hash_lock);
4460
4461 del_timer(&addr_chk_timer);
4462 rtnl_unlock();
4463
4464 unregister_pernet_subsys(&addrconf_net_ops);
4465 }
kernel-based virtual machine