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RT-AC66 3.0.0.4.374.130 core
[tomato.git] / release / src-rt-6.x / linux / linux-2.6 / net / ipv6 / addrconf.c
blob69c88d5a1459b1c01be5b3b523012711995a64f7
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/sock.h>
66 #include <net/snmp.h>
67
68 #include <net/ipv6.h>
69 #include <net/protocol.h>
70 #include <net/ndisc.h>
71 #include <net/ip6_route.h>
72 #include <net/addrconf.h>
73 #include <net/tcp.h>
74 #include <net/ip.h>
75 #include <net/netlink.h>
76 #include <net/pkt_sched.h>
77 #include <linux/if_tunnel.h>
78 #include <linux/rtnetlink.h>
79
80 #ifdef CONFIG_IPV6_PRIVACY
81 #include <linux/random.h>
82 #endif
83
84 #include <asm/uaccess.h>
85 #include <asm/unaligned.h>
86
87 #include <linux/proc_fs.h>
88 #include <linux/seq_file.h>
89
90 /* Set to 3 to get tracing... */
91 #define ACONF_DEBUG 2
92
93 #if ACONF_DEBUG >= 3
94 #define ADBG(x) printk x
95 #else
96 #define ADBG(x)
97 #endif
98
99 #define INFINITY_LIFE_TIME 0xFFFFFFFF
100 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
101
102 #ifdef CONFIG_SYSCTL
103 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
104 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
105 #endif
106
107 #ifdef CONFIG_IPV6_PRIVACY
108 static int __ipv6_regen_rndid(struct inet6_dev *idev);
109 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
110 static void ipv6_regen_rndid(unsigned long data);
111
112 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
113 #endif
114
115 static int ipv6_count_addresses(struct inet6_dev *idev);
116
117 /*
118 * Configured unicast address hash table
119 */
120 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
121 static DEFINE_RWLOCK(addrconf_hash_lock);
122
123 static void addrconf_verify(unsigned long);
124
125 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
126 static DEFINE_SPINLOCK(addrconf_verify_lock);
127
128 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
129 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
130
131 static int addrconf_ifdown(struct net_device *dev, int how);
132
133 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
134 static void addrconf_dad_timer(unsigned long data);
135 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
136 static void addrconf_dad_run(struct inet6_dev *idev);
137 static void addrconf_rs_timer(unsigned long data);
138 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
139 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
140
141 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
142 struct prefix_info *pinfo);
143 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
144
145 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
146
147 struct ipv6_devconf ipv6_devconf __read_mostly = {
148 .forwarding = 0,
149 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
150 .mtu6 = IPV6_MIN_MTU,
151 .accept_ra = 1,
152 .accept_redirects = 1,
153 .autoconf = 1,
154 .force_mld_version = 0,
155 .dad_transmits = 1,
156 .rtr_solicits = MAX_RTR_SOLICITATIONS,
157 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
158 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
159 #ifdef CONFIG_IPV6_PRIVACY
160 .use_tempaddr = 0,
161 .temp_valid_lft = TEMP_VALID_LIFETIME,
162 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
163 .regen_max_retry = REGEN_MAX_RETRY,
164 .max_desync_factor = MAX_DESYNC_FACTOR,
165 #endif
166 .max_addresses = IPV6_MAX_ADDRESSES,
167 .accept_ra_defrtr = 1,
168 .accept_ra_pinfo = 1,
169 #ifdef CONFIG_IPV6_ROUTER_PREF
170 .accept_ra_rtr_pref = 1,
171 .rtr_probe_interval = 60 * HZ,
172 #ifdef CONFIG_IPV6_ROUTE_INFO
173 .accept_ra_rt_info_max_plen = 0,
174 #endif
175 #endif
176 .proxy_ndp = 0,
177 .accept_source_route = 0, /* we do not accept RH0 by default. */
178 .disable_ipv6 = 0,
179 };
180
181 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
182 .forwarding = 0,
183 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
184 .mtu6 = IPV6_MIN_MTU,
185 .accept_ra = 1,
186 .accept_redirects = 1,
187 .autoconf = 1,
188 .dad_transmits = 1,
189 .rtr_solicits = MAX_RTR_SOLICITATIONS,
190 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
191 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
192 #ifdef CONFIG_IPV6_PRIVACY
193 .use_tempaddr = 0,
194 .temp_valid_lft = TEMP_VALID_LIFETIME,
195 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
196 .regen_max_retry = REGEN_MAX_RETRY,
197 .max_desync_factor = MAX_DESYNC_FACTOR,
198 #endif
199 .max_addresses = IPV6_MAX_ADDRESSES,
200 .accept_ra_defrtr = 1,
201 .accept_ra_pinfo = 1,
202 #ifdef CONFIG_IPV6_ROUTER_PREF
203 .accept_ra_rtr_pref = 1,
204 .rtr_probe_interval = 60 * HZ,
205 #ifdef CONFIG_IPV6_ROUTE_INFO
206 .accept_ra_rt_info_max_plen = 0,
207 #endif
208 #endif
209 .proxy_ndp = 0,
210 .accept_source_route = 0, /* we do not accept RH0 by default. */
211 .disable_ipv6 = 0,
212 };
213
214 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
215 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
216 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
217
218 /* Check if a valid qdisc is available */
219 static inline int addrconf_qdisc_ok(struct net_device *dev)
220 {
221 return (dev->qdisc != &noop_qdisc);
222 }
223
224 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
225 {
226 if (del_timer(&ifp->timer))
227 __in6_ifa_put(ifp);
228 }
229
230 enum addrconf_timer_t
231 {
232 AC_NONE,
233 AC_DAD,
234 AC_RS,
235 };
236
237 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
238 enum addrconf_timer_t what,
239 unsigned long when)
240 {
241 if (!del_timer(&ifp->timer))
242 in6_ifa_hold(ifp);
243
244 switch (what) {
245 case AC_DAD:
246 ifp->timer.function = addrconf_dad_timer;
247 break;
248 case AC_RS:
249 ifp->timer.function = addrconf_rs_timer;
250 break;
251 default:;
252 }
253 ifp->timer.expires = jiffies + when;
254 add_timer(&ifp->timer);
255 }
256
257 static int snmp6_alloc_dev(struct inet6_dev *idev)
258 {
259 int err = -ENOMEM;
260
261 if (!idev || !idev->dev)
262 return -EINVAL;
263
264 if (snmp_mib_init((void **)idev->stats.ipv6,
265 sizeof(struct ipstats_mib),
266 __alignof__(struct ipstats_mib)) < 0)
267 goto err_ip;
268 if (snmp_mib_init((void **)idev->stats.icmpv6,
269 sizeof(struct icmpv6_mib),
270 __alignof__(struct icmpv6_mib)) < 0)
271 goto err_icmp;
272
273 return 0;
274
275 err_icmp:
276 snmp_mib_free((void **)idev->stats.ipv6);
277 err_ip:
278 return err;
279 }
280
281 static int snmp6_free_dev(struct inet6_dev *idev)
282 {
283 snmp_mib_free((void **)idev->stats.icmpv6);
284 snmp_mib_free((void **)idev->stats.ipv6);
285 return 0;
286 }
287
288 /* Nobody refers to this device, we may destroy it. */
289
290 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
291 {
292 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
293 kfree(idev);
294 }
295
296 void in6_dev_finish_destroy(struct inet6_dev *idev)
297 {
298 struct net_device *dev = idev->dev;
299 BUG_TRAP(idev->addr_list==NULL);
300 BUG_TRAP(idev->mc_list==NULL);
301 #ifdef NET_REFCNT_DEBUG
302 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
303 #endif
304 dev_put(dev);
305 if (!idev->dead) {
306 printk("Freeing alive inet6 device %p\n", idev);
307 return;
308 }
309 snmp6_free_dev(idev);
310 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
311 }
312
313 EXPORT_SYMBOL(in6_dev_finish_destroy);
314
315 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
316 {
317 struct inet6_dev *ndev;
318 struct in6_addr maddr;
319
320 ASSERT_RTNL();
321
322 if (dev->mtu < IPV6_MIN_MTU)
323 return NULL;
324
325 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
326
327 if (ndev == NULL)
328 return NULL;
329
330 rwlock_init(&ndev->lock);
331 ndev->dev = dev;
332 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
333 ndev->cnf.mtu6 = dev->mtu;
334 ndev->cnf.sysctl = NULL;
335 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
336 if (ndev->nd_parms == NULL) {
337 kfree(ndev);
338 return NULL;
339 }
340 /* We refer to the device */
341 dev_hold(dev);
342
343 if (snmp6_alloc_dev(ndev) < 0) {
344 ADBG((KERN_WARNING
345 "%s(): cannot allocate memory for statistics; dev=%s.\n",
346 __FUNCTION__, dev->name));
347 neigh_parms_release(&nd_tbl, ndev->nd_parms);
348 ndev->dead = 1;
349 in6_dev_finish_destroy(ndev);
350 return NULL;
351 }
352
353 if (snmp6_register_dev(ndev) < 0) {
354 ADBG((KERN_WARNING
355 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
356 __FUNCTION__, dev->name));
357 neigh_parms_release(&nd_tbl, ndev->nd_parms);
358 ndev->dead = 1;
359 in6_dev_finish_destroy(ndev);
360 return NULL;
361 }
362
363 /* One reference from device. We must do this before
364 * we invoke __ipv6_regen_rndid().
365 */
366 in6_dev_hold(ndev);
367
368 #ifdef CONFIG_IPV6_PRIVACY
369 init_timer(&ndev->regen_timer);
370 ndev->regen_timer.function = ipv6_regen_rndid;
371 ndev->regen_timer.data = (unsigned long) ndev;
372 if ((dev->flags&IFF_LOOPBACK) ||
373 dev->type == ARPHRD_TUNNEL ||
374 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
375 dev->type == ARPHRD_SIT ||
376 #endif
377 dev->type == ARPHRD_NONE) {
378 printk(KERN_INFO
379 "%s: Disabled Privacy Extensions\n",
380 dev->name);
381 ndev->cnf.use_tempaddr = -1;
382 } else {
383 in6_dev_hold(ndev);
384 ipv6_regen_rndid((unsigned long) ndev);
385 }
386 #endif
387
388 if (netif_running(dev) && addrconf_qdisc_ok(dev))
389 ndev->if_flags |= IF_READY;
390
391 ipv6_mc_init_dev(ndev);
392 ndev->tstamp = jiffies;
393 #ifdef CONFIG_SYSCTL
394 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
395 NET_IPV6_NEIGH, "ipv6",
396 &ndisc_ifinfo_sysctl_change,
397 NULL);
398 addrconf_sysctl_register(ndev, &ndev->cnf);
399 #endif
400 /* protected by rtnl_lock */
401 rcu_assign_pointer(dev->ip6_ptr, ndev);
402
403 /* Join all-node multicast group */
404 ipv6_addr_all_nodes(&maddr);
405 ipv6_dev_mc_inc(dev, &maddr);
406
407 return ndev;
408 }
409
410 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
411 {
412 struct inet6_dev *idev;
413
414 ASSERT_RTNL();
415
416 if ((idev = __in6_dev_get(dev)) == NULL) {
417 if ((idev = ipv6_add_dev(dev)) == NULL)
418 return NULL;
419 }
420
421 if (dev->flags&IFF_UP)
422 ipv6_mc_up(idev);
423 return idev;
424 }
425
426 #ifdef CONFIG_SYSCTL
427 static void dev_forward_change(struct inet6_dev *idev)
428 {
429 struct net_device *dev;
430 struct inet6_ifaddr *ifa;
431 struct in6_addr addr;
432
433 if (!idev)
434 return;
435 dev = idev->dev;
436 if (dev && (dev->flags & IFF_MULTICAST)) {
437 ipv6_addr_all_routers(&addr);
438
439 if (idev->cnf.forwarding)
440 ipv6_dev_mc_inc(dev, &addr);
441 else
442 ipv6_dev_mc_dec(dev, &addr);
443 }
444 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
445 if (ifa->flags&IFA_F_TENTATIVE)
446 continue;
447 if (idev->cnf.forwarding)
448 addrconf_join_anycast(ifa);
449 else
450 addrconf_leave_anycast(ifa);
451 }
452 }
453
454 static u32 ipv6_addr_hash(const struct in6_addr *addr)
455 {
456 /*
457 * We perform the hash function over the last 64 bits of the address
458 * This will include the IEEE address token on links that support it.
459 */
460 return jhash_2words(addr->s6_addr32[2], addr->s6_addr32[3], 0)
461 & (IN6_ADDR_HSIZE - 1);
462 }
463
464 static void addrconf_forward_change(void)
465 {
466 struct net_device *dev;
467 struct inet6_dev *idev;
468
469 read_lock(&dev_base_lock);
470 for_each_netdev(dev) {
471 rcu_read_lock();
472 idev = __in6_dev_get(dev);
473 if (idev) {
474 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
475 idev->cnf.forwarding = ipv6_devconf.forwarding;
476 if (changed)
477 dev_forward_change(idev);
478 }
479 rcu_read_unlock();
480 }
481 read_unlock(&dev_base_lock);
482 }
483 #endif
484
485 /* Nobody refers to this ifaddr, destroy it */
486
487 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
488 {
489 BUG_TRAP(ifp->if_next==NULL);
490 BUG_TRAP(ifp->lst_next==NULL);
491 #ifdef NET_REFCNT_DEBUG
492 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
493 #endif
494
495 in6_dev_put(ifp->idev);
496
497 if (del_timer(&ifp->timer))
498 printk("Timer is still running, when freeing ifa=%p\n", ifp);
499
500 if (!ifp->dead) {
501 printk("Freeing alive inet6 address %p\n", ifp);
502 return;
503 }
504 dst_release(&ifp->rt->u.dst);
505
506 kfree(ifp);
507 }
508
509 static void
510 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
511 {
512 struct inet6_ifaddr *ifa, **ifap;
513 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
514
515 /*
516 * Each device address list is sorted in order of scope -
517 * global before linklocal.
518 */
519 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
520 ifap = &ifa->if_next) {
521 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
522 break;
523 }
524
525 ifp->if_next = *ifap;
526 *ifap = ifp;
527 }
528
529 /* On success it returns ifp with increased reference count */
530
531 static struct inet6_ifaddr *
532 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
533 int scope, u32 flags)
534 {
535 struct inet6_ifaddr *ifa = NULL;
536 struct rt6_info *rt;
537 unsigned int hash;
538 int err = 0;
539 int addr_type = ipv6_addr_type(addr);
540
541 if (addr_type == IPV6_ADDR_ANY ||
542 addr_type & IPV6_ADDR_MULTICAST ||
543 (!(idev->dev->flags & IFF_LOOPBACK) &&
544 addr_type & IPV6_ADDR_LOOPBACK))
545 return ERR_PTR(-EADDRNOTAVAIL);
546
547 rcu_read_lock_bh();
548 if (idev->dead) {
549 err = -ENODEV; /*XXX*/
550 goto out2;
551 }
552
553 if (idev->cnf.disable_ipv6) {
554 err = -EACCES;
555 goto out2;
556 }
557
558 write_lock(&addrconf_hash_lock);
559
560 /* Ignore adding duplicate addresses on an interface */
561 if (ipv6_chk_same_addr(addr, idev->dev)) {
562 ADBG(("ipv6_add_addr: already assigned\n"));
563 err = -EEXIST;
564 goto out;
565 }
566
567 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
568
569 if (ifa == NULL) {
570 ADBG(("ipv6_add_addr: malloc failed\n"));
571 err = -ENOBUFS;
572 goto out;
573 }
574
575 rt = addrconf_dst_alloc(idev, addr, 0);
576 if (IS_ERR(rt)) {
577 err = PTR_ERR(rt);
578 goto out;
579 }
580
581 ipv6_addr_copy(&ifa->addr, addr);
582
583 spin_lock_init(&ifa->lock);
584 init_timer(&ifa->timer);
585 ifa->timer.data = (unsigned long) ifa;
586 ifa->scope = scope;
587 ifa->prefix_len = pfxlen;
588 ifa->flags = flags | IFA_F_TENTATIVE;
589 ifa->cstamp = ifa->tstamp = jiffies;
590
591 ifa->rt = rt;
592
593 /*
594 * part one of RFC 4429, section 3.3
595 * We should not configure an address as
596 * optimistic if we do not yet know the link
597 * layer address of our nexhop router
598 */
599
600 if (rt->rt6i_nexthop == NULL)
601 ifa->flags &= ~IFA_F_OPTIMISTIC;
602
603 ifa->idev = idev;
604 in6_dev_hold(idev);
605 /* For caller */
606 in6_ifa_hold(ifa);
607
608 /* Add to big hash table */
609 hash = ipv6_addr_hash(addr);
610
611 ifa->lst_next = inet6_addr_lst[hash];
612 inet6_addr_lst[hash] = ifa;
613 in6_ifa_hold(ifa);
614 write_unlock(&addrconf_hash_lock);
615
616 write_lock(&idev->lock);
617 /* Add to inet6_dev unicast addr list. */
618 ipv6_link_dev_addr(idev, ifa);
619
620 #ifdef CONFIG_IPV6_PRIVACY
621 if (ifa->flags&IFA_F_TEMPORARY) {
622 ifa->tmp_next = idev->tempaddr_list;
623 idev->tempaddr_list = ifa;
624 in6_ifa_hold(ifa);
625 }
626 #endif
627
628 in6_ifa_hold(ifa);
629 write_unlock(&idev->lock);
630 out2:
631 rcu_read_unlock_bh();
632
633 if (likely(err == 0))
634 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
635 else {
636 kfree(ifa);
637 ifa = ERR_PTR(err);
638 }
639
640 return ifa;
641 out:
642 write_unlock(&addrconf_hash_lock);
643 goto out2;
644 }
645
646 /* This function wants to get referenced ifp and releases it before return */
647
648 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
649 {
650 struct inet6_ifaddr *ifa, **ifap;
651 struct inet6_dev *idev = ifp->idev;
652 int hash;
653 int deleted = 0, onlink = 0;
654 unsigned long expires = jiffies;
655
656 hash = ipv6_addr_hash(&ifp->addr);
657
658 ifp->dead = 1;
659
660 write_lock_bh(&addrconf_hash_lock);
661 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
662 ifap = &ifa->lst_next) {
663 if (ifa == ifp) {
664 *ifap = ifa->lst_next;
665 __in6_ifa_put(ifp);
666 ifa->lst_next = NULL;
667 break;
668 }
669 }
670 write_unlock_bh(&addrconf_hash_lock);
671
672 write_lock_bh(&idev->lock);
673 #ifdef CONFIG_IPV6_PRIVACY
674 if (ifp->flags&IFA_F_TEMPORARY) {
675 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
676 ifap = &ifa->tmp_next) {
677 if (ifa == ifp) {
678 *ifap = ifa->tmp_next;
679 if (ifp->ifpub) {
680 in6_ifa_put(ifp->ifpub);
681 ifp->ifpub = NULL;
682 }
683 __in6_ifa_put(ifp);
684 ifa->tmp_next = NULL;
685 break;
686 }
687 }
688 }
689 #endif
690
691 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
692 if (ifa == ifp) {
693 *ifap = ifa->if_next;
694 __in6_ifa_put(ifp);
695 ifa->if_next = NULL;
696 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
697 break;
698 deleted = 1;
699 continue;
700 } else if (ifp->flags & IFA_F_PERMANENT) {
701 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
702 ifp->prefix_len)) {
703 if (ifa->flags & IFA_F_PERMANENT) {
704 onlink = 1;
705 if (deleted)
706 break;
707 } else {
708 unsigned long lifetime;
709
710 if (!onlink)
711 onlink = -1;
712
713 spin_lock(&ifa->lock);
714 lifetime = min_t(unsigned long,
715 ifa->valid_lft, 0x7fffffffUL/HZ);
716 if (time_before(expires,
717 ifa->tstamp + lifetime * HZ))
718 expires = ifa->tstamp + lifetime * HZ;
719 spin_unlock(&ifa->lock);
720 }
721 }
722 }
723 ifap = &ifa->if_next;
724 }
725 write_unlock_bh(&idev->lock);
726
727 addrconf_del_timer(ifp);
728
729 ipv6_ifa_notify(RTM_DELADDR, ifp);
730
731 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
732
733 /*
734 * Purge or update corresponding prefix
735 *
736 * 1) we don't purge prefix here if address was not permanent.
737 * prefix is managed by its own lifetime.
738 * 2) if there're no addresses, delete prefix.
739 * 3) if there're still other permanent address(es),
740 * corresponding prefix is still permanent.
741 * 4) otherwise, update prefix lifetime to the
742 * longest valid lifetime among the corresponding
743 * addresses on the device.
744 * Note: subsequent RA will update lifetime.
745 *
746 * --yoshfuji
747 */
748 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
749 struct in6_addr prefix;
750 struct rt6_info *rt;
751
752 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
753 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
754
755 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
756 if (onlink == 0) {
757 ip6_del_rt(rt);
758 rt = NULL;
759 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
760 rt->rt6i_expires = expires;
761 rt->rt6i_flags |= RTF_EXPIRES;
762 }
763 }
764 dst_release(&rt->u.dst);
765 }
766
767 in6_ifa_put(ifp);
768 }
769
770 #ifdef CONFIG_IPV6_PRIVACY
771 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
772 {
773 struct inet6_dev *idev = ifp->idev;
774 struct in6_addr addr, *tmpaddr;
775 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
776 int tmp_plen;
777 int ret = 0;
778 int max_addresses;
779 u32 addr_flags;
780
781 write_lock(&idev->lock);
782 if (ift) {
783 spin_lock_bh(&ift->lock);
784 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
785 spin_unlock_bh(&ift->lock);
786 tmpaddr = &addr;
787 } else {
788 tmpaddr = NULL;
789 }
790 retry:
791 in6_dev_hold(idev);
792 if (idev->cnf.use_tempaddr <= 0) {
793 write_unlock(&idev->lock);
794 printk(KERN_INFO
795 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
796 in6_dev_put(idev);
797 ret = -1;
798 goto out;
799 }
800 spin_lock_bh(&ifp->lock);
801 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
802 idev->cnf.use_tempaddr = -1; /*XXX*/
803 spin_unlock_bh(&ifp->lock);
804 write_unlock(&idev->lock);
805 printk(KERN_WARNING
806 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
807 in6_dev_put(idev);
808 ret = -1;
809 goto out;
810 }
811 in6_ifa_hold(ifp);
812 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
813 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
814 spin_unlock_bh(&ifp->lock);
815 write_unlock(&idev->lock);
816 printk(KERN_WARNING
817 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
818 in6_ifa_put(ifp);
819 in6_dev_put(idev);
820 ret = -1;
821 goto out;
822 }
823 memcpy(&addr.s6_addr[8], idev->rndid, 8);
824 tmp_valid_lft = min_t(__u32,
825 ifp->valid_lft,
826 idev->cnf.temp_valid_lft);
827 tmp_prefered_lft = min_t(__u32,
828 ifp->prefered_lft,
829 idev->cnf.temp_prefered_lft - desync_factor / HZ);
830 tmp_plen = ifp->prefix_len;
831 max_addresses = idev->cnf.max_addresses;
832 tmp_cstamp = ifp->cstamp;
833 tmp_tstamp = ifp->tstamp;
834 spin_unlock_bh(&ifp->lock);
835
836 write_unlock(&idev->lock);
837
838 addr_flags = IFA_F_TEMPORARY;
839 /* set in addrconf_prefix_rcv() */
840 if (ifp->flags & IFA_F_OPTIMISTIC)
841 addr_flags |= IFA_F_OPTIMISTIC;
842
843 ift = !max_addresses ||
844 ipv6_count_addresses(idev) < max_addresses ?
845 ipv6_add_addr(idev, &addr, tmp_plen,
846 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
847 addr_flags) : NULL;
848 if (!ift || IS_ERR(ift)) {
849 in6_ifa_put(ifp);
850 in6_dev_put(idev);
851 printk(KERN_INFO
852 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
853 tmpaddr = &addr;
854 write_lock(&idev->lock);
855 goto retry;
856 }
857
858 spin_lock_bh(&ift->lock);
859 ift->ifpub = ifp;
860 ift->valid_lft = tmp_valid_lft;
861 ift->prefered_lft = tmp_prefered_lft;
862 ift->cstamp = tmp_cstamp;
863 ift->tstamp = tmp_tstamp;
864 spin_unlock_bh(&ift->lock);
865
866 addrconf_dad_start(ift, 0);
867 in6_ifa_put(ift);
868 in6_dev_put(idev);
869 out:
870 return ret;
871 }
872 #endif
873
874 /*
875 * Choose an appropriate source address (RFC3484)
876 */
877 struct ipv6_saddr_score {
878 int addr_type;
879 unsigned int attrs;
880 int matchlen;
881 int scope;
882 unsigned int rule;
883 };
884
885 #define IPV6_SADDR_SCORE_LOCAL 0x0001
886 #define IPV6_SADDR_SCORE_PREFERRED 0x0004
887 #define IPV6_SADDR_SCORE_HOA 0x0008
888 #define IPV6_SADDR_SCORE_OIF 0x0010
889 #define IPV6_SADDR_SCORE_LABEL 0x0020
890 #define IPV6_SADDR_SCORE_PRIVACY 0x0040
891
892 static inline int ipv6_saddr_preferred(int type)
893 {
894 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
895 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
896 return 1;
897 return 0;
898 }
899
900 /* static matching label */
901 static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
902 {
903 /*
904 * prefix (longest match) label
905 * -----------------------------
906 * ::1/128 0
907 * ::/0 1
908 * 2002::/16 2
909 * ::/96 3
910 * ::ffff:0:0/96 4
911 * fc00::/7 5
912 * 2001::/32 6
913 */
914 if (type & IPV6_ADDR_LOOPBACK)
915 return 0;
916 else if (type & IPV6_ADDR_COMPATv4)
917 return 3;
918 else if (type & IPV6_ADDR_MAPPED)
919 return 4;
920 else if (addr->s6_addr32[0] == htonl(0x20010000))
921 return 6;
922 else if (addr->s6_addr16[0] == htons(0x2002))
923 return 2;
924 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
925 return 5;
926 return 1;
927 }
928
929 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
930 struct in6_addr *daddr, struct in6_addr *saddr)
931 {
932 struct ipv6_saddr_score hiscore;
933 struct inet6_ifaddr *ifa_result = NULL;
934 int daddr_type = __ipv6_addr_type(daddr);
935 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
936 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
937 struct net_device *dev;
938
939 memset(&hiscore, 0, sizeof(hiscore));
940
941 read_lock(&dev_base_lock);
942 rcu_read_lock();
943
944 for_each_netdev(dev) {
945 struct inet6_dev *idev;
946 struct inet6_ifaddr *ifa;
947
948 /* Rule 0: Candidate Source Address (section 4)
949 * - multicast and link-local destination address,
950 * the set of candidate source address MUST only
951 * include addresses assigned to interfaces
952 * belonging to the same link as the outgoing
953 * interface.
954 * (- For site-local destination addresses, the
955 * set of candidate source addresses MUST only
956 * include addresses assigned to interfaces
957 * belonging to the same site as the outgoing
958 * interface.)
959 */
960 if ((daddr_type & IPV6_ADDR_MULTICAST ||
961 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
962 daddr_dev && dev != daddr_dev)
963 continue;
964
965 idev = __in6_dev_get(dev);
966 if (!idev)
967 continue;
968
969 read_lock_bh(&idev->lock);
970 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
971 struct ipv6_saddr_score score;
972
973 score.addr_type = __ipv6_addr_type(&ifa->addr);
974
975 /* Rule 0:
976 * - Tentative Address (RFC2462 section 5.4)
977 * - A tentative address is not considered
978 * "assigned to an interface" in the traditional
979 * sense, unless it is also flagged as optimistic.
980 * - Candidate Source Address (section 4)
981 * - In any case, anycast addresses, multicast
982 * addresses, and the unspecified address MUST
983 * NOT be included in a candidate set.
984 */
985 if ((ifa->flags & IFA_F_TENTATIVE) &&
986 (!(ifa->flags & IFA_F_OPTIMISTIC)))
987 continue;
988 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
989 score.addr_type & IPV6_ADDR_MULTICAST)) {
990 LIMIT_NETDEBUG(KERN_DEBUG
991 "ADDRCONF: unspecified / multicast address"
992 "assigned as unicast address on %s",
993 dev->name);
994 continue;
995 }
996
997 score.attrs = 0;
998 score.matchlen = 0;
999 score.scope = 0;
1000 score.rule = 0;
1001
1002 if (ifa_result == NULL) {
1003 /* record it if the first available entry */
1004 goto record_it;
1005 }
1006
1007 /* Rule 1: Prefer same address */
1008 if (hiscore.rule < 1) {
1009 if (ipv6_addr_equal(&ifa_result->addr, daddr))
1010 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
1011 hiscore.rule++;
1012 }
1013 if (ipv6_addr_equal(&ifa->addr, daddr)) {
1014 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
1015 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
1016 score.rule = 1;
1017 goto record_it;
1018 }
1019 } else {
1020 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
1021 continue;
1022 }
1023
1024 /* Rule 2: Prefer appropriate scope */
1025 if (hiscore.rule < 2) {
1026 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1027 hiscore.rule++;
1028 }
1029 score.scope = __ipv6_addr_src_scope(score.addr_type);
1030 if (hiscore.scope < score.scope) {
1031 if (hiscore.scope < daddr_scope) {
1032 score.rule = 2;
1033 goto record_it;
1034 } else
1035 continue;
1036 } else if (score.scope < hiscore.scope) {
1037 if (score.scope < daddr_scope)
1038 break; /* addresses sorted by scope */
1039 else {
1040 score.rule = 2;
1041 goto record_it;
1042 }
1043 }
1044
1045 /* Rule 3: Avoid deprecated and optimistic addresses */
1046 if (hiscore.rule < 3) {
1047 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1048 (((ifa_result->flags &
1049 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1050 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1051 hiscore.rule++;
1052 }
1053 if (ipv6_saddr_preferred(score.addr_type) ||
1054 (((ifa->flags &
1055 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1056 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1057 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1058 score.rule = 3;
1059 goto record_it;
1060 }
1061 } else {
1062 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1063 continue;
1064 }
1065
1066 /* Rule 4: Prefer home address */
1067 #ifdef CONFIG_IPV6_MIP6
1068 if (hiscore.rule < 4) {
1069 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1070 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1071 hiscore.rule++;
1072 }
1073 if (ifa->flags & IFA_F_HOMEADDRESS) {
1074 score.attrs |= IPV6_SADDR_SCORE_HOA;
1075 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1076 score.rule = 4;
1077 goto record_it;
1078 }
1079 } else {
1080 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1081 continue;
1082 }
1083 #else
1084 if (hiscore.rule < 4)
1085 hiscore.rule++;
1086 #endif
1087
1088 /* Rule 5: Prefer outgoing interface */
1089 if (hiscore.rule < 5) {
1090 if (daddr_dev == NULL ||
1091 daddr_dev == ifa_result->idev->dev)
1092 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1093 hiscore.rule++;
1094 }
1095 if (daddr_dev == NULL ||
1096 daddr_dev == ifa->idev->dev) {
1097 score.attrs |= IPV6_SADDR_SCORE_OIF;
1098 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1099 score.rule = 5;
1100 goto record_it;
1101 }
1102 } else {
1103 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1104 continue;
1105 }
1106
1107 /* Rule 6: Prefer matching label */
1108 if (hiscore.rule < 6) {
1109 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1110 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1111 hiscore.rule++;
1112 }
1113 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1114 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1115 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1116 score.rule = 6;
1117 goto record_it;
1118 }
1119 } else {
1120 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1121 continue;
1122 }
1123
1124 #ifdef CONFIG_IPV6_PRIVACY
1125 /* Rule 7: Prefer public address
1126 * Note: prefer temprary address if use_tempaddr >= 2
1127 */
1128 if (hiscore.rule < 7) {
1129 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1130 (ifa_result->idev->cnf.use_tempaddr >= 2))
1131 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1132 hiscore.rule++;
1133 }
1134 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1135 (ifa->idev->cnf.use_tempaddr >= 2)) {
1136 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1137 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1138 score.rule = 7;
1139 goto record_it;
1140 }
1141 } else {
1142 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1143 continue;
1144 }
1145 #else
1146 if (hiscore.rule < 7)
1147 hiscore.rule++;
1148 #endif
1149 /* Rule 8: Use longest matching prefix */
1150 if (hiscore.rule < 8) {
1151 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1152 hiscore.rule++;
1153 }
1154 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1155 if (score.matchlen > hiscore.matchlen) {
1156 score.rule = 8;
1157 goto record_it;
1158 }
1159 #if 0
1160 else if (score.matchlen < hiscore.matchlen)
1161 continue;
1162 #endif
1163
1164 /* Final Rule: choose first available one */
1165 continue;
1166 record_it:
1167 if (ifa_result)
1168 in6_ifa_put(ifa_result);
1169 in6_ifa_hold(ifa);
1170 ifa_result = ifa;
1171 hiscore = score;
1172 }
1173 read_unlock_bh(&idev->lock);
1174 }
1175 rcu_read_unlock();
1176 read_unlock(&dev_base_lock);
1177
1178 if (!ifa_result)
1179 return -EADDRNOTAVAIL;
1180
1181 ipv6_addr_copy(saddr, &ifa_result->addr);
1182 in6_ifa_put(ifa_result);
1183 return 0;
1184 }
1185
1186
1187 int ipv6_get_saddr(struct dst_entry *dst,
1188 struct in6_addr *daddr, struct in6_addr *saddr)
1189 {
1190 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1191 }
1192
1193 EXPORT_SYMBOL(ipv6_get_saddr);
1194
1195 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1196 unsigned char banned_flags)
1197 {
1198 struct inet6_dev *idev;
1199 int err = -EADDRNOTAVAIL;
1200
1201 rcu_read_lock();
1202 if ((idev = __in6_dev_get(dev)) != NULL) {
1203 struct inet6_ifaddr *ifp;
1204
1205 read_lock_bh(&idev->lock);
1206 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1207 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1208 ipv6_addr_copy(addr, &ifp->addr);
1209 err = 0;
1210 break;
1211 }
1212 }
1213 read_unlock_bh(&idev->lock);
1214 }
1215 rcu_read_unlock();
1216 return err;
1217 }
1218
1219 static int ipv6_count_addresses(struct inet6_dev *idev)
1220 {
1221 int cnt = 0;
1222 struct inet6_ifaddr *ifp;
1223
1224 read_lock_bh(&idev->lock);
1225 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1226 cnt++;
1227 read_unlock_bh(&idev->lock);
1228 return cnt;
1229 }
1230
1231 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1232 {
1233 struct inet6_ifaddr * ifp;
1234 unsigned int hash = ipv6_addr_hash(addr);
1235
1236 read_lock_bh(&addrconf_hash_lock);
1237 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1238 if (ipv6_addr_equal(&ifp->addr, addr) &&
1239 !(ifp->flags&IFA_F_TENTATIVE)) {
1240 if (dev == NULL || ifp->idev->dev == dev ||
1241 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1242 break;
1243 }
1244 }
1245 read_unlock_bh(&addrconf_hash_lock);
1246 return ifp != NULL;
1247 }
1248
1249 EXPORT_SYMBOL(ipv6_chk_addr);
1250
1251 static
1252 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1253 {
1254 struct inet6_ifaddr * ifp;
1255 unsigned int hash = ipv6_addr_hash(addr);
1256
1257 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1258 if (ipv6_addr_equal(&ifp->addr, addr)) {
1259 if (dev == NULL || ifp->idev->dev == dev)
1260 break;
1261 }
1262 }
1263 return ifp != NULL;
1264 }
1265
1266 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1267 {
1268 struct inet6_ifaddr * ifp;
1269 unsigned int hash = ipv6_addr_hash(addr);
1270
1271 read_lock_bh(&addrconf_hash_lock);
1272 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1273 if (ipv6_addr_equal(&ifp->addr, addr)) {
1274 if (dev == NULL || ifp->idev->dev == dev ||
1275 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1276 in6_ifa_hold(ifp);
1277 break;
1278 }
1279 }
1280 }
1281 read_unlock_bh(&addrconf_hash_lock);
1282
1283 return ifp;
1284 }
1285
1286 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1287 {
1288 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1289 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1290 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1291 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1292 int sk_ipv6only = ipv6_only_sock(sk);
1293 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1294 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1295 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1296
1297 if (!sk2_rcv_saddr && !sk_ipv6only)
1298 return 1;
1299
1300 if (addr_type2 == IPV6_ADDR_ANY &&
1301 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1302 return 1;
1303
1304 if (addr_type == IPV6_ADDR_ANY &&
1305 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1306 return 1;
1307
1308 if (sk2_rcv_saddr6 &&
1309 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1310 return 1;
1311
1312 if (addr_type == IPV6_ADDR_MAPPED &&
1313 !sk2_ipv6only &&
1314 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1315 return 1;
1316
1317 return 0;
1318 }
1319
1320 /* Gets referenced address, destroys ifaddr */
1321
1322 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1323 {
1324 if (ifp->flags&IFA_F_PERMANENT) {
1325 spin_lock_bh(&ifp->lock);
1326 addrconf_del_timer(ifp);
1327 ifp->flags |= IFA_F_TENTATIVE;
1328 spin_unlock_bh(&ifp->lock);
1329 in6_ifa_put(ifp);
1330 #ifdef CONFIG_IPV6_PRIVACY
1331 } else if (ifp->flags&IFA_F_TEMPORARY) {
1332 struct inet6_ifaddr *ifpub;
1333 spin_lock_bh(&ifp->lock);
1334 ifpub = ifp->ifpub;
1335 if (ifpub) {
1336 in6_ifa_hold(ifpub);
1337 spin_unlock_bh(&ifp->lock);
1338 ipv6_create_tempaddr(ifpub, ifp);
1339 in6_ifa_put(ifpub);
1340 } else {
1341 spin_unlock_bh(&ifp->lock);
1342 }
1343 ipv6_del_addr(ifp);
1344 #endif
1345 } else
1346 ipv6_del_addr(ifp);
1347 }
1348
1349 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1350 {
1351 if (net_ratelimit())
1352 printk(KERN_INFO "%s: IPv6 duplicate address detected!\n",
1353 ifp->idev->dev->name);
1354
1355 addrconf_dad_stop(ifp);
1356 }
1357
1358 /* Join to solicited addr multicast group. */
1359
1360 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1361 {
1362 struct in6_addr maddr;
1363
1364 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1365 return;
1366
1367 addrconf_addr_solict_mult(addr, &maddr);
1368 ipv6_dev_mc_inc(dev, &maddr);
1369 }
1370
1371 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1372 {
1373 struct in6_addr maddr;
1374
1375 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1376 return;
1377
1378 addrconf_addr_solict_mult(addr, &maddr);
1379 __ipv6_dev_mc_dec(idev, &maddr);
1380 }
1381
1382 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1383 {
1384 struct in6_addr addr;
1385 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1386 if (ipv6_addr_any(&addr))
1387 return;
1388 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1389 }
1390
1391 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1392 {
1393 struct in6_addr addr;
1394 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1395 if (ipv6_addr_any(&addr))
1396 return;
1397 __ipv6_dev_ac_dec(ifp->idev, &addr);
1398 }
1399
1400 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1401 {
1402 if (dev->addr_len != ETH_ALEN)
1403 return -1;
1404 memcpy(eui, dev->dev_addr, 3);
1405 memcpy(eui + 5, dev->dev_addr + 3, 3);
1406
1407 /*
1408 * The zSeries OSA network cards can be shared among various
1409 * OS instances, but the OSA cards have only one MAC address.
1410 * This leads to duplicate address conflicts in conjunction
1411 * with IPv6 if more than one instance uses the same card.
1412 *
1413 * The driver for these cards can deliver a unique 16-bit
1414 * identifier for each instance sharing the same card. It is
1415 * placed instead of 0xFFFE in the interface identifier. The
1416 * "u" bit of the interface identifier is not inverted in this
1417 * case. Hence the resulting interface identifier has local
1418 * scope according to RFC2373.
1419 */
1420 if (dev->dev_id) {
1421 eui[3] = (dev->dev_id >> 8) & 0xFF;
1422 eui[4] = dev->dev_id & 0xFF;
1423 } else {
1424 eui[3] = 0xFF;
1425 eui[4] = 0xFE;
1426 eui[0] ^= 2;
1427 }
1428 return 0;
1429 }
1430
1431 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1432 {
1433 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1434 if (dev->addr_len != ARCNET_ALEN)
1435 return -1;
1436 memset(eui, 0, 7);
1437 eui[7] = *(u8*)dev->dev_addr;
1438 return 0;
1439 }
1440
1441 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1442 {
1443 if (dev->addr_len != INFINIBAND_ALEN)
1444 return -1;
1445 memcpy(eui, dev->dev_addr + 12, 8);
1446 eui[0] |= 2;
1447 return 0;
1448 }
1449
1450 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1451 {
1452 switch (dev->type) {
1453 case ARPHRD_ETHER:
1454 case ARPHRD_FDDI:
1455 case ARPHRD_IEEE802_TR:
1456 return addrconf_ifid_eui48(eui, dev);
1457 case ARPHRD_ARCNET:
1458 return addrconf_ifid_arcnet(eui, dev);
1459 case ARPHRD_INFINIBAND:
1460 return addrconf_ifid_infiniband(eui, dev);
1461 }
1462 return -1;
1463 }
1464
1465 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1466 {
1467 int err = -1;
1468 struct inet6_ifaddr *ifp;
1469
1470 read_lock_bh(&idev->lock);
1471 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1472 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1473 memcpy(eui, ifp->addr.s6_addr+8, 8);
1474 err = 0;
1475 break;
1476 }
1477 }
1478 read_unlock_bh(&idev->lock);
1479 return err;
1480 }
1481
1482 #ifdef CONFIG_IPV6_PRIVACY
1483 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1484 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1485 {
1486 regen:
1487 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1488 idev->rndid[0] &= ~0x02;
1489
1490 /*
1491 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1492 * check if generated address is not inappropriate
1493 *
1494 * - Reserved subnet anycast (RFC 2526)
1495 * 11111101 11....11 1xxxxxxx
1496 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1497 * 00-00-5E-FE-xx-xx-xx-xx
1498 * - value 0
1499 * - XXX: already assigned to an address on the device
1500 */
1501 if (idev->rndid[0] == 0xfd &&
1502 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1503 (idev->rndid[7]&0x80))
1504 goto regen;
1505 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1506 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1507 goto regen;
1508 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1509 goto regen;
1510 }
1511
1512 return 0;
1513 }
1514
1515 static void ipv6_regen_rndid(unsigned long data)
1516 {
1517 struct inet6_dev *idev = (struct inet6_dev *) data;
1518 unsigned long expires;
1519
1520 rcu_read_lock_bh();
1521 write_lock_bh(&idev->lock);
1522
1523 if (idev->dead)
1524 goto out;
1525
1526 if (__ipv6_regen_rndid(idev) < 0)
1527 goto out;
1528
1529 expires = jiffies +
1530 idev->cnf.temp_prefered_lft * HZ -
1531 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1532 if (time_before(expires, jiffies)) {
1533 printk(KERN_WARNING
1534 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1535 idev->dev->name);
1536 goto out;
1537 }
1538
1539 if (!mod_timer(&idev->regen_timer, expires))
1540 in6_dev_hold(idev);
1541
1542 out:
1543 write_unlock_bh(&idev->lock);
1544 rcu_read_unlock_bh();
1545 in6_dev_put(idev);
1546 }
1547
1548 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1549 int ret = 0;
1550
1551 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1552 ret = __ipv6_regen_rndid(idev);
1553 return ret;
1554 }
1555 #endif
1556
1557 /*
1558 * Add prefix route.
1559 */
1560
1561 static void
1562 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1563 unsigned long expires, u32 flags)
1564 {
1565 struct fib6_config cfg = {
1566 .fc_table = RT6_TABLE_PREFIX,
1567 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1568 .fc_ifindex = dev->ifindex,
1569 .fc_expires = expires,
1570 .fc_dst_len = plen,
1571 .fc_flags = RTF_UP | flags,
1572 .fc_protocol = RTPROT_KERNEL,
1573 };
1574
1575 ipv6_addr_copy(&cfg.fc_dst, pfx);
1576
1577 /* Prevent useless cloning on PtP SIT.
1578 This thing is done here expecting that the whole
1579 class of non-broadcast devices need not cloning.
1580 */
1581 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1582 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1583 cfg.fc_flags |= RTF_NONEXTHOP;
1584 #endif
1585
1586 ip6_route_add(&cfg);
1587 }
1588
1589 /* Create "default" multicast route to the interface */
1590
1591 static void addrconf_add_mroute(struct net_device *dev)
1592 {
1593 struct fib6_config cfg = {
1594 .fc_table = RT6_TABLE_LOCAL,
1595 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1596 .fc_ifindex = dev->ifindex,
1597 .fc_dst_len = 8,
1598 .fc_flags = RTF_UP,
1599 };
1600
1601 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1602
1603 ip6_route_add(&cfg);
1604 }
1605
1606 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1607 static void sit_route_add(struct net_device *dev)
1608 {
1609 struct fib6_config cfg = {
1610 .fc_table = RT6_TABLE_MAIN,
1611 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1612 .fc_ifindex = dev->ifindex,
1613 .fc_dst_len = 96,
1614 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1615 };
1616
1617 /* prefix length - 96 bits "::d.d.d.d" */
1618 ip6_route_add(&cfg);
1619 }
1620 #endif
1621
1622 static void addrconf_add_lroute(struct net_device *dev)
1623 {
1624 struct in6_addr addr;
1625
1626 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1627 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1628 }
1629
1630 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1631 {
1632 struct inet6_dev *idev;
1633
1634 ASSERT_RTNL();
1635
1636 idev = ipv6_find_idev(dev);
1637 if (!idev)
1638 return ERR_PTR(-ENOBUFS);
1639
1640 if (idev->cnf.disable_ipv6)
1641 return ERR_PTR(-EACCES);
1642
1643 /* Add default multicast route */
1644 addrconf_add_mroute(dev);
1645
1646 /* Add link local route */
1647 addrconf_add_lroute(dev);
1648 return idev;
1649 }
1650
1651 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1652 {
1653 struct prefix_info *pinfo;
1654 __u32 valid_lft;
1655 __u32 prefered_lft;
1656 int addr_type;
1657 unsigned long rt_expires;
1658 struct inet6_dev *in6_dev;
1659
1660 pinfo = (struct prefix_info *) opt;
1661
1662 if (len < sizeof(struct prefix_info)) {
1663 ADBG(("addrconf: prefix option too short\n"));
1664 return;
1665 }
1666
1667 /*
1668 * Validation checks ([ADDRCONF], page 19)
1669 */
1670
1671 addr_type = ipv6_addr_type(&pinfo->prefix);
1672
1673 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1674 return;
1675
1676 valid_lft = ntohl(pinfo->valid);
1677 prefered_lft = ntohl(pinfo->prefered);
1678
1679 if (prefered_lft > valid_lft) {
1680 if (net_ratelimit())
1681 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1682 return;
1683 }
1684
1685 in6_dev = in6_dev_get(dev);
1686
1687 if (in6_dev == NULL) {
1688 if (net_ratelimit())
1689 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1690 return;
1691 }
1692
1693 /*
1694 * Two things going on here:
1695 * 1) Add routes for on-link prefixes
1696 * 2) Configure prefixes with the auto flag set
1697 */
1698
1699 if (valid_lft == INFINITY_LIFE_TIME)
1700 rt_expires = ~0UL;
1701 else if (valid_lft >= 0x7FFFFFFF/HZ) {
1702 /* Avoid arithmetic overflow. Really, we could
1703 * save rt_expires in seconds, likely valid_lft,
1704 * but it would require division in fib gc, that it
1705 * not good.
1706 */
1707 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1708 } else
1709 rt_expires = valid_lft * HZ;
1710
1711 /*
1712 * We convert this (in jiffies) to clock_t later.
1713 * Avoid arithmetic overflow there as well.
1714 * Overflow can happen only if HZ < USER_HZ.
1715 */
1716 if (HZ < USER_HZ && ~rt_expires && rt_expires > 0x7FFFFFFF / USER_HZ)
1717 rt_expires = 0x7FFFFFFF / USER_HZ;
1718
1719 if (pinfo->onlink) {
1720 struct rt6_info *rt;
1721 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1722
1723 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1724 /* Autoconf prefix route */
1725 if (valid_lft == 0) {
1726 ip6_del_rt(rt);
1727 rt = NULL;
1728 } else if (~rt_expires) {
1729 /* not infinity */
1730 rt->rt6i_expires = jiffies + rt_expires;
1731 rt->rt6i_flags |= RTF_EXPIRES;
1732 } else {
1733 rt->rt6i_flags &= ~RTF_EXPIRES;
1734 rt->rt6i_expires = 0;
1735 }
1736 } else if (valid_lft) {
1737 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1738 clock_t expires = 0;
1739 if (~rt_expires) {
1740 /* not infinity */
1741 flags |= RTF_EXPIRES;
1742 expires = jiffies_to_clock_t(rt_expires);
1743 }
1744 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1745 dev, expires, flags);
1746 }
1747 if (rt)
1748 dst_release(&rt->u.dst);
1749 }
1750
1751 /* Try to figure out our local address for this prefix */
1752
1753 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1754 struct inet6_ifaddr * ifp;
1755 struct in6_addr addr;
1756 int create = 0, update_lft = 0;
1757
1758 if (pinfo->prefix_len == 64) {
1759 memcpy(&addr, &pinfo->prefix, 8);
1760 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1761 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1762 in6_dev_put(in6_dev);
1763 return;
1764 }
1765 goto ok;
1766 }
1767 if (net_ratelimit())
1768 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1769 pinfo->prefix_len);
1770 in6_dev_put(in6_dev);
1771 return;
1772
1773 ok:
1774
1775 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1776
1777 if (ifp == NULL && valid_lft) {
1778 int max_addresses = in6_dev->cnf.max_addresses;
1779 u32 addr_flags = 0;
1780
1781 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1782 if (in6_dev->cnf.optimistic_dad &&
1783 !ipv6_devconf.forwarding)
1784 addr_flags = IFA_F_OPTIMISTIC;
1785 #endif
1786
1787 /* Do not allow to create too much of autoconfigured
1788 * addresses; this would be too easy way to crash kernel.
1789 */
1790 if (!max_addresses ||
1791 ipv6_count_addresses(in6_dev) < max_addresses)
1792 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1793 addr_type&IPV6_ADDR_SCOPE_MASK,
1794 addr_flags);
1795
1796 if (!ifp || IS_ERR(ifp)) {
1797 in6_dev_put(in6_dev);
1798 return;
1799 }
1800
1801 update_lft = create = 1;
1802 ifp->cstamp = jiffies;
1803 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1804 }
1805
1806 if (ifp) {
1807 int flags;
1808 unsigned long now;
1809 #ifdef CONFIG_IPV6_PRIVACY
1810 struct inet6_ifaddr *ift;
1811 #endif
1812 u32 stored_lft;
1813
1814 /* update lifetime (RFC2462 5.5.3 e) */
1815 spin_lock(&ifp->lock);
1816 now = jiffies;
1817 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1818 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1819 else
1820 stored_lft = 0;
1821 if (!update_lft && stored_lft) {
1822 if (valid_lft > MIN_VALID_LIFETIME ||
1823 valid_lft > stored_lft)
1824 update_lft = 1;
1825 else if (stored_lft <= MIN_VALID_LIFETIME) {
1826 /* valid_lft <= stored_lft is always true */
1827 /*
1828 * RFC 4862 Section 5.5.3e:
1829 * "Note that the preferred lifetime of
1830 * the corresponding address is always
1831 * reset to the Preferred Lifetime in
1832 * the received Prefix Information
1833 * option, regardless of whether the
1834 * valid lifetime is also reset or
1835 * ignored."
1836 *
1837 * So if the preferred lifetime in
1838 * this advertisement is different
1839 * than what we have stored, but the
1840 * valid lifetime is invalid, just
1841 * reset prefered_lft.
1842 *
1843 * We must set the valid lifetime
1844 * to the stored lifetime since we'll
1845 * be updating the timestamp below,
1846 * else we'll set it back to the
1847 * minumum.
1848 */
1849 if (prefered_lft != ifp->prefered_lft) {
1850 valid_lft = stored_lft;
1851 update_lft = 1;
1852 }
1853 } else {
1854 valid_lft = MIN_VALID_LIFETIME;
1855 if (valid_lft < prefered_lft)
1856 prefered_lft = valid_lft;
1857 update_lft = 1;
1858 }
1859 }
1860
1861 if (update_lft) {
1862 ifp->valid_lft = valid_lft;
1863 ifp->prefered_lft = prefered_lft;
1864 ifp->tstamp = now;
1865 flags = ifp->flags;
1866 ifp->flags &= ~IFA_F_DEPRECATED;
1867 spin_unlock(&ifp->lock);
1868
1869 if (!(flags&IFA_F_TENTATIVE))
1870 ipv6_ifa_notify(0, ifp);
1871 } else
1872 spin_unlock(&ifp->lock);
1873
1874 #ifdef CONFIG_IPV6_PRIVACY
1875 read_lock_bh(&in6_dev->lock);
1876 /* update all temporary addresses in the list */
1877 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1878 /*
1879 * When adjusting the lifetimes of an existing
1880 * temporary address, only lower the lifetimes.
1881 * Implementations must not increase the
1882 * lifetimes of an existing temporary address
1883 * when processing a Prefix Information Option.
1884 */
1885 if (ifp != ift->ifpub)
1886 continue;
1887
1888 spin_lock(&ift->lock);
1889 flags = ift->flags;
1890 if (ift->valid_lft > valid_lft &&
1891 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1892 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1893 if (ift->prefered_lft > prefered_lft &&
1894 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1895 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1896 spin_unlock(&ift->lock);
1897 if (!(flags&IFA_F_TENTATIVE))
1898 ipv6_ifa_notify(0, ift);
1899 }
1900
1901 if (create && in6_dev->cnf.use_tempaddr > 0) {
1902 /*
1903 * When a new public address is created as described in [ADDRCONF],
1904 * also create a new temporary address.
1905 */
1906 read_unlock_bh(&in6_dev->lock);
1907 ipv6_create_tempaddr(ifp, NULL);
1908 } else {
1909 read_unlock_bh(&in6_dev->lock);
1910 }
1911 #endif
1912 in6_ifa_put(ifp);
1913 addrconf_verify(0);
1914 }
1915 }
1916 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1917 in6_dev_put(in6_dev);
1918 }
1919
1920 /*
1921 * Set destination address.
1922 * Special case for SIT interfaces where we create a new "virtual"
1923 * device.
1924 */
1925 int addrconf_set_dstaddr(void __user *arg)
1926 {
1927 struct in6_ifreq ireq;
1928 struct net_device *dev;
1929 int err = -EINVAL;
1930
1931 rtnl_lock();
1932
1933 err = -EFAULT;
1934 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1935 goto err_exit;
1936
1937 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1938
1939 err = -ENODEV;
1940 if (dev == NULL)
1941 goto err_exit;
1942
1943 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1944 if (dev->type == ARPHRD_SIT) {
1945 struct ifreq ifr;
1946 mm_segment_t oldfs;
1947 struct ip_tunnel_parm p;
1948
1949 err = -EADDRNOTAVAIL;
1950 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1951 goto err_exit;
1952
1953 memset(&p, 0, sizeof(p));
1954 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1955 p.iph.saddr = 0;
1956 p.iph.version = 4;
1957 p.iph.ihl = 5;
1958 p.iph.protocol = IPPROTO_IPV6;
1959 p.iph.ttl = 64;
1960 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1961
1962 oldfs = get_fs(); set_fs(KERNEL_DS);
1963 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1964 set_fs(oldfs);
1965
1966 if (err == 0) {
1967 err = -ENOBUFS;
1968 if ((dev = __dev_get_by_name(p.name)) == NULL)
1969 goto err_exit;
1970 err = dev_open(dev);
1971 }
1972 }
1973 #endif
1974
1975 err_exit:
1976 rtnl_unlock();
1977 return err;
1978 }
1979
1980 /*
1981 * Manual configuration of address on an interface
1982 */
1983 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1984 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1985 {
1986 struct inet6_ifaddr *ifp;
1987 struct inet6_dev *idev;
1988 struct net_device *dev;
1989 int scope;
1990 u32 flags;
1991 clock_t expires;
1992
1993 ASSERT_RTNL();
1994
1995 /* check the lifetime */
1996 if (!valid_lft || prefered_lft > valid_lft)
1997 return -EINVAL;
1998
1999 if ((dev = __dev_get_by_index(ifindex)) == NULL)
2000 return -ENODEV;
2001
2002 idev = addrconf_add_dev(dev);
2003 if (IS_ERR(idev))
2004 return PTR_ERR(idev);
2005
2006 scope = ipv6_addr_scope(pfx);
2007
2008 if (valid_lft == INFINITY_LIFE_TIME) {
2009 ifa_flags |= IFA_F_PERMANENT;
2010 flags = 0;
2011 expires = 0;
2012 } else {
2013 if (valid_lft >= 0x7FFFFFFF/HZ)
2014 valid_lft = 0x7FFFFFFF/HZ;
2015 flags = RTF_EXPIRES;
2016 expires = jiffies_to_clock_t(valid_lft * HZ);
2017 }
2018
2019 if (prefered_lft == 0)
2020 ifa_flags |= IFA_F_DEPRECATED;
2021 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2022 (prefered_lft != INFINITY_LIFE_TIME))
2023 prefered_lft = 0x7FFFFFFF/HZ;
2024
2025 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2026
2027 if (!IS_ERR(ifp)) {
2028 spin_lock_bh(&ifp->lock);
2029 ifp->valid_lft = valid_lft;
2030 ifp->prefered_lft = prefered_lft;
2031 ifp->tstamp = jiffies;
2032 spin_unlock_bh(&ifp->lock);
2033
2034 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2035 expires, flags);
2036 /*
2037 * Note that section 3.1 of RFC 4429 indicates
2038 * that the Optimistic flag should not be set for
2039 * manually configured addresses
2040 */
2041 addrconf_dad_start(ifp, 0);
2042 in6_ifa_put(ifp);
2043 addrconf_verify(0);
2044 return 0;
2045 }
2046
2047 return PTR_ERR(ifp);
2048 }
2049
2050 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
2051 {
2052 struct inet6_ifaddr *ifp;
2053 struct inet6_dev *idev;
2054 struct net_device *dev;
2055
2056 if ((dev = __dev_get_by_index(ifindex)) == NULL)
2057 return -ENODEV;
2058
2059 if ((idev = __in6_dev_get(dev)) == NULL)
2060 return -ENXIO;
2061
2062 read_lock_bh(&idev->lock);
2063 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2064 if (ifp->prefix_len == plen &&
2065 ipv6_addr_equal(pfx, &ifp->addr)) {
2066 in6_ifa_hold(ifp);
2067 read_unlock_bh(&idev->lock);
2068
2069 ipv6_del_addr(ifp);
2070
2071 /* If the last address is deleted administratively,
2072 disable IPv6 on this interface.
2073 */
2074 if (idev->addr_list == NULL)
2075 addrconf_ifdown(idev->dev, 1);
2076 return 0;
2077 }
2078 }
2079 read_unlock_bh(&idev->lock);
2080 return -EADDRNOTAVAIL;
2081 }
2082
2083
2084 int addrconf_add_ifaddr(void __user *arg)
2085 {
2086 struct in6_ifreq ireq;
2087 int err;
2088
2089 if (!capable(CAP_NET_ADMIN))
2090 return -EPERM;
2091
2092 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2093 return -EFAULT;
2094
2095 rtnl_lock();
2096 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2097 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2098 rtnl_unlock();
2099 return err;
2100 }
2101
2102 int addrconf_del_ifaddr(void __user *arg)
2103 {
2104 struct in6_ifreq ireq;
2105 int err;
2106
2107 if (!capable(CAP_NET_ADMIN))
2108 return -EPERM;
2109
2110 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2111 return -EFAULT;
2112
2113 rtnl_lock();
2114 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2115 rtnl_unlock();
2116 return err;
2117 }
2118
2119 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2120 static void sit_add_v4_addrs(struct inet6_dev *idev)
2121 {
2122 struct inet6_ifaddr * ifp;
2123 struct in6_addr addr;
2124 struct net_device *dev;
2125 int scope;
2126
2127 ASSERT_RTNL();
2128
2129 memset(&addr, 0, sizeof(struct in6_addr));
2130 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2131
2132 if (idev->dev->flags&IFF_POINTOPOINT) {
2133 addr.s6_addr32[0] = htonl(0xfe800000);
2134 scope = IFA_LINK;
2135 } else {
2136 scope = IPV6_ADDR_COMPATv4;
2137 }
2138
2139 if (addr.s6_addr32[3]) {
2140 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2141 if (!IS_ERR(ifp)) {
2142 spin_lock_bh(&ifp->lock);
2143 ifp->flags &= ~IFA_F_TENTATIVE;
2144 spin_unlock_bh(&ifp->lock);
2145 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2146 in6_ifa_put(ifp);
2147 }
2148 return;
2149 }
2150
2151 for_each_netdev(dev) {
2152 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2153 if (in_dev && (dev->flags & IFF_UP)) {
2154 struct in_ifaddr * ifa;
2155
2156 int flag = scope;
2157
2158 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2159 int plen;
2160
2161 addr.s6_addr32[3] = ifa->ifa_local;
2162
2163 if (ifa->ifa_scope == RT_SCOPE_LINK)
2164 continue;
2165 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2166 if (idev->dev->flags&IFF_POINTOPOINT)
2167 continue;
2168 flag |= IFA_HOST;
2169 }
2170 if (idev->dev->flags&IFF_POINTOPOINT)
2171 plen = 64;
2172 else
2173 plen = 96;
2174
2175 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2176 IFA_F_PERMANENT);
2177 if (!IS_ERR(ifp)) {
2178 spin_lock_bh(&ifp->lock);
2179 ifp->flags &= ~IFA_F_TENTATIVE;
2180 spin_unlock_bh(&ifp->lock);
2181 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2182 in6_ifa_put(ifp);
2183 }
2184 }
2185 }
2186 }
2187 }
2188 #endif
2189
2190 static void init_loopback(struct net_device *dev)
2191 {
2192 struct inet6_dev *idev;
2193 struct inet6_ifaddr * ifp;
2194
2195 /* ::1 */
2196
2197 ASSERT_RTNL();
2198
2199 if ((idev = ipv6_find_idev(dev)) == NULL) {
2200 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2201 return;
2202 }
2203
2204 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2205 if (!IS_ERR(ifp)) {
2206 spin_lock_bh(&ifp->lock);
2207 ifp->flags &= ~IFA_F_TENTATIVE;
2208 spin_unlock_bh(&ifp->lock);
2209 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2210 in6_ifa_put(ifp);
2211 }
2212 }
2213
2214 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2215 {
2216 struct inet6_ifaddr * ifp;
2217 u32 addr_flags = IFA_F_PERMANENT;
2218
2219 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2220 if (idev->cnf.optimistic_dad &&
2221 !ipv6_devconf.forwarding)
2222 addr_flags |= IFA_F_OPTIMISTIC;
2223 #endif
2224
2225
2226 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2227 if (!IS_ERR(ifp)) {
2228 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2229 addrconf_dad_start(ifp, 0);
2230 in6_ifa_put(ifp);
2231 }
2232 }
2233
2234 static void addrconf_dev_config(struct net_device *dev)
2235 {
2236 struct in6_addr addr;
2237 struct inet6_dev * idev;
2238
2239 ASSERT_RTNL();
2240
2241 if ((dev->type != ARPHRD_ETHER) &&
2242 (dev->type != ARPHRD_FDDI) &&
2243 (dev->type != ARPHRD_IEEE802_TR) &&
2244 (dev->type != ARPHRD_ARCNET) &&
2245 (dev->type != ARPHRD_INFINIBAND)) {
2246 /* Alas, we support only Ethernet autoconfiguration. */
2247 return;
2248 }
2249
2250 idev = addrconf_add_dev(dev);
2251 if (IS_ERR(idev))
2252 return;
2253
2254 memset(&addr, 0, sizeof(struct in6_addr));
2255 addr.s6_addr32[0] = htonl(0xFE800000);
2256
2257 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2258 addrconf_add_linklocal(idev, &addr);
2259 }
2260
2261 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2262 static void addrconf_sit_config(struct net_device *dev)
2263 {
2264 struct inet6_dev *idev;
2265
2266 ASSERT_RTNL();
2267
2268 /*
2269 * Configure the tunnel with one of our IPv4
2270 * addresses... we should configure all of
2271 * our v4 addrs in the tunnel
2272 */
2273
2274 if ((idev = ipv6_find_idev(dev)) == NULL) {
2275 printk(KERN_DEBUG "init sit: add_dev failed\n");
2276 return;
2277 }
2278
2279 sit_add_v4_addrs(idev);
2280
2281 if (dev->flags&IFF_POINTOPOINT) {
2282 addrconf_add_mroute(dev);
2283 addrconf_add_lroute(dev);
2284 } else
2285 sit_route_add(dev);
2286 }
2287 #endif
2288
2289 static inline int
2290 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2291 {
2292 struct in6_addr lladdr;
2293
2294 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2295 addrconf_add_linklocal(idev, &lladdr);
2296 return 0;
2297 }
2298 return -1;
2299 }
2300
2301 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2302 {
2303 struct net_device *link_dev;
2304
2305 /* first try to inherit the link-local address from the link device */
2306 if (idev->dev->iflink &&
2307 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2308 if (!ipv6_inherit_linklocal(idev, link_dev))
2309 return;
2310 }
2311 /* then try to inherit it from any device */
2312 for_each_netdev(link_dev) {
2313 if (!ipv6_inherit_linklocal(idev, link_dev))
2314 return;
2315 }
2316 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2317 }
2318
2319 /*
2320 * Autoconfigure tunnel with a link-local address so routing protocols,
2321 * DHCPv6, MLD etc. can be run over the virtual link
2322 */
2323
2324 static void addrconf_ip6_tnl_config(struct net_device *dev)
2325 {
2326 struct inet6_dev *idev;
2327
2328 ASSERT_RTNL();
2329
2330 idev = addrconf_add_dev(dev);
2331 if (IS_ERR(idev)) {
2332 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2333 return;
2334 }
2335 ip6_tnl_add_linklocal(idev);
2336 }
2337
2338 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2339 void * data)
2340 {
2341 struct net_device *dev = (struct net_device *) data;
2342 struct inet6_dev *idev = __in6_dev_get(dev);
2343 int run_pending = 0;
2344
2345 switch(event) {
2346 case NETDEV_REGISTER:
2347 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2348 idev = ipv6_add_dev(dev);
2349 if (!idev)
2350 printk(KERN_WARNING "IPv6: add_dev failed for %s\n",
2351 dev->name);
2352 }
2353 break;
2354 case NETDEV_UP:
2355 case NETDEV_CHANGE:
2356 if (event == NETDEV_UP) {
2357 if (!addrconf_qdisc_ok(dev)) {
2358 /* device is not ready yet. */
2359 printk(KERN_INFO
2360 "ADDRCONF(NETDEV_UP): %s: "
2361 "link is not ready\n",
2362 dev->name);
2363 break;
2364 }
2365
2366 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2367 idev = ipv6_add_dev(dev);
2368
2369 if (idev)
2370 idev->if_flags |= IF_READY;
2371 } else {
2372 if (!addrconf_qdisc_ok(dev)) {
2373 /* device is still not ready. */
2374 break;
2375 }
2376
2377 if (idev) {
2378 if (idev->if_flags & IF_READY) {
2379 /* device is already configured. */
2380 break;
2381 }
2382 idev->if_flags |= IF_READY;
2383 }
2384
2385 printk(KERN_INFO
2386 "ADDRCONF(NETDEV_CHANGE): %s: "
2387 "link becomes ready\n",
2388 dev->name);
2389
2390 run_pending = 1;
2391 }
2392
2393 switch(dev->type) {
2394 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2395 case ARPHRD_SIT:
2396 addrconf_sit_config(dev);
2397 break;
2398 #endif
2399 case ARPHRD_TUNNEL6:
2400 addrconf_ip6_tnl_config(dev);
2401 break;
2402 case ARPHRD_LOOPBACK:
2403 init_loopback(dev);
2404 break;
2405
2406 default:
2407 addrconf_dev_config(dev);
2408 break;
2409 }
2410 if (idev) {
2411 if (run_pending)
2412 addrconf_dad_run(idev);
2413
2414 /* If the MTU changed during the interface down, when the
2415 interface up, the changed MTU must be reflected in the
2416 idev as well as routers.
2417 */
2418 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2419 rt6_mtu_change(dev, dev->mtu);
2420 idev->cnf.mtu6 = dev->mtu;
2421 }
2422 idev->tstamp = jiffies;
2423 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2424 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2425 stop IPv6 on this interface.
2426 */
2427 if (dev->mtu < IPV6_MIN_MTU)
2428 addrconf_ifdown(dev, event != NETDEV_DOWN);
2429 }
2430 break;
2431
2432 case NETDEV_CHANGEMTU:
2433 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2434 rt6_mtu_change(dev, dev->mtu);
2435 idev->cnf.mtu6 = dev->mtu;
2436 break;
2437 }
2438
2439 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2440 idev = ipv6_add_dev(dev);
2441 if (idev)
2442 break;
2443 }
2444
2445 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2446
2447 case NETDEV_DOWN:
2448 case NETDEV_UNREGISTER:
2449 /*
2450 * Remove all addresses from this interface.
2451 */
2452 addrconf_ifdown(dev, event != NETDEV_DOWN);
2453 break;
2454
2455 case NETDEV_CHANGENAME:
2456 if (idev) {
2457 snmp6_unregister_dev(idev);
2458 #ifdef CONFIG_SYSCTL
2459 addrconf_sysctl_unregister(&idev->cnf);
2460 neigh_sysctl_unregister(idev->nd_parms);
2461 neigh_sysctl_register(dev, idev->nd_parms,
2462 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2463 &ndisc_ifinfo_sysctl_change,
2464 NULL);
2465 addrconf_sysctl_register(idev, &idev->cnf);
2466 #endif
2467 snmp6_register_dev(idev);
2468 }
2469 break;
2470 }
2471
2472 return NOTIFY_OK;
2473 }
2474
2475 /*
2476 * addrconf module should be notified of a device going up
2477 */
2478 static struct notifier_block ipv6_dev_notf = {
2479 .notifier_call = addrconf_notify,
2480 .priority = 0
2481 };
2482
2483 static int addrconf_ifdown(struct net_device *dev, int how)
2484 {
2485 struct inet6_dev *idev;
2486 struct inet6_ifaddr *ifa, **bifa;
2487 int i;
2488
2489 ASSERT_RTNL();
2490
2491 if (dev == &loopback_dev && how == 1)
2492 how = 0;
2493
2494 rt6_ifdown(dev);
2495 neigh_ifdown(&nd_tbl, dev);
2496
2497 idev = __in6_dev_get(dev);
2498 if (idev == NULL)
2499 return -ENODEV;
2500
2501 /* Step 1: remove reference to ipv6 device from parent device.
2502 Do not dev_put!
2503 */
2504 if (how == 1) {
2505 idev->dead = 1;
2506
2507 /* protected by rtnl_lock */
2508 rcu_assign_pointer(dev->ip6_ptr, NULL);
2509
2510 /* Step 1.5: remove snmp6 entry */
2511 snmp6_unregister_dev(idev);
2512
2513 }
2514
2515 /* Step 2: clear hash table */
2516 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2517 bifa = &inet6_addr_lst[i];
2518
2519 write_lock_bh(&addrconf_hash_lock);
2520 while ((ifa = *bifa) != NULL) {
2521 if (ifa->idev == idev) {
2522 *bifa = ifa->lst_next;
2523 ifa->lst_next = NULL;
2524 addrconf_del_timer(ifa);
2525 in6_ifa_put(ifa);
2526 continue;
2527 }
2528 bifa = &ifa->lst_next;
2529 }
2530 write_unlock_bh(&addrconf_hash_lock);
2531 }
2532
2533 write_lock_bh(&idev->lock);
2534
2535 /* Step 3: clear flags for stateless addrconf */
2536 if (how != 1)
2537 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2538
2539 /* Step 4: clear address list */
2540 #ifdef CONFIG_IPV6_PRIVACY
2541 if (how == 1 && del_timer(&idev->regen_timer))
2542 in6_dev_put(idev);
2543
2544 /* clear tempaddr list */
2545 while ((ifa = idev->tempaddr_list) != NULL) {
2546 idev->tempaddr_list = ifa->tmp_next;
2547 ifa->tmp_next = NULL;
2548 ifa->dead = 1;
2549 write_unlock_bh(&idev->lock);
2550 spin_lock_bh(&ifa->lock);
2551
2552 if (ifa->ifpub) {
2553 in6_ifa_put(ifa->ifpub);
2554 ifa->ifpub = NULL;
2555 }
2556 spin_unlock_bh(&ifa->lock);
2557 in6_ifa_put(ifa);
2558 write_lock_bh(&idev->lock);
2559 }
2560 #endif
2561 while ((ifa = idev->addr_list) != NULL) {
2562 idev->addr_list = ifa->if_next;
2563 ifa->if_next = NULL;
2564 ifa->dead = 1;
2565 addrconf_del_timer(ifa);
2566 write_unlock_bh(&idev->lock);
2567
2568 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2569 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2570 in6_ifa_put(ifa);
2571
2572 write_lock_bh(&idev->lock);
2573 }
2574 write_unlock_bh(&idev->lock);
2575
2576 /* Step 5: Discard multicast list */
2577
2578 if (how == 1)
2579 ipv6_mc_destroy_dev(idev);
2580 else
2581 ipv6_mc_down(idev);
2582
2583 /* Step 5: netlink notification of this interface */
2584 idev->tstamp = jiffies;
2585 inet6_ifinfo_notify(RTM_DELLINK, idev);
2586
2587 /* Shot the device (if unregistered) */
2588
2589 if (how == 1) {
2590 #ifdef CONFIG_SYSCTL
2591 addrconf_sysctl_unregister(&idev->cnf);
2592 neigh_sysctl_unregister(idev->nd_parms);
2593 #endif
2594 neigh_parms_release(&nd_tbl, idev->nd_parms);
2595 neigh_ifdown(&nd_tbl, dev);
2596 in6_dev_put(idev);
2597 }
2598 return 0;
2599 }
2600
2601 static void addrconf_rs_timer(unsigned long data)
2602 {
2603 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2604 struct inet6_dev *idev = ifp->idev;
2605
2606 read_lock(&idev->lock);
2607 if (idev->dead || !(idev->if_flags & IF_READY))
2608 goto out;
2609
2610 if (idev->cnf.forwarding)
2611 goto out;
2612
2613 /* Announcement received after solicitation was sent */
2614 if (idev->if_flags & IF_RA_RCVD)
2615 goto out;
2616
2617 spin_lock(&ifp->lock);
2618 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2619 struct in6_addr all_routers;
2620
2621 /* The wait after the last probe can be shorter */
2622 addrconf_mod_timer(ifp, AC_RS,
2623 (ifp->probes == idev->cnf.rtr_solicits) ?
2624 idev->cnf.rtr_solicit_delay :
2625 idev->cnf.rtr_solicit_interval);
2626 spin_unlock(&ifp->lock);
2627
2628 ipv6_addr_all_routers(&all_routers);
2629
2630 ndisc_send_rs(idev->dev, &ifp->addr, &all_routers);
2631 } else {
2632 spin_unlock(&ifp->lock);
2633 /*
2634 * Note: we do not support deprecated "all on-link"
2635 * assumption any longer.
2636 */
2637 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2638 idev->dev->name);
2639 }
2640
2641 out:
2642 read_unlock(&idev->lock);
2643 in6_ifa_put(ifp);
2644 }
2645
2646 /*
2647 * Duplicate Address Detection
2648 */
2649 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2650 {
2651 unsigned long rand_num;
2652 struct inet6_dev *idev = ifp->idev;
2653
2654 if (ifp->flags & IFA_F_OPTIMISTIC)
2655 rand_num = 0;
2656 else
2657 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2658
2659 ifp->probes = idev->cnf.dad_transmits;
2660 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2661 }
2662
2663 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2664 {
2665 struct inet6_dev *idev = ifp->idev;
2666 struct net_device *dev = idev->dev;
2667
2668 addrconf_join_solict(dev, &ifp->addr);
2669
2670 net_srandom(ifp->addr.s6_addr32[3]);
2671
2672 read_lock_bh(&idev->lock);
2673 if (ifp->dead)
2674 goto out;
2675 spin_lock_bh(&ifp->lock);
2676
2677 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2678 !(ifp->flags&IFA_F_TENTATIVE) ||
2679 ifp->flags & IFA_F_NODAD) {
2680 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2681 spin_unlock_bh(&ifp->lock);
2682 read_unlock_bh(&idev->lock);
2683
2684 addrconf_dad_completed(ifp);
2685 return;
2686 }
2687
2688 if (!(idev->if_flags & IF_READY)) {
2689 spin_unlock_bh(&ifp->lock);
2690 read_unlock_bh(&idev->lock);
2691 /*
2692 * If the defice is not ready:
2693 * - keep it tentative if it is a permanent address.
2694 * - otherwise, kill it.
2695 */
2696 in6_ifa_hold(ifp);
2697 addrconf_dad_stop(ifp);
2698 return;
2699 }
2700
2701 /*
2702 * Optimistic nodes can start receiving
2703 * Frames right away
2704 */
2705 if(ifp->flags & IFA_F_OPTIMISTIC)
2706 ip6_ins_rt(ifp->rt);
2707
2708 addrconf_dad_kick(ifp);
2709 spin_unlock_bh(&ifp->lock);
2710 out:
2711 read_unlock_bh(&idev->lock);
2712 }
2713
2714 static void addrconf_dad_timer(unsigned long data)
2715 {
2716 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2717 struct inet6_dev *idev = ifp->idev;
2718 struct in6_addr unspec;
2719 struct in6_addr mcaddr;
2720
2721 read_lock_bh(&idev->lock);
2722 if (idev->dead) {
2723 read_unlock_bh(&idev->lock);
2724 goto out;
2725 }
2726 spin_lock_bh(&ifp->lock);
2727 if (ifp->probes == 0) {
2728 /*
2729 * DAD was successful
2730 */
2731
2732 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2733 spin_unlock_bh(&ifp->lock);
2734 read_unlock_bh(&idev->lock);
2735
2736 addrconf_dad_completed(ifp);
2737
2738 goto out;
2739 }
2740
2741 ifp->probes--;
2742 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2743 spin_unlock_bh(&ifp->lock);
2744 read_unlock_bh(&idev->lock);
2745
2746 /* send a neighbour solicitation for our addr */
2747 memset(&unspec, 0, sizeof(unspec));
2748 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2749 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2750 out:
2751 in6_ifa_put(ifp);
2752 }
2753
2754 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2755 {
2756 struct net_device * dev = ifp->idev->dev;
2757
2758 /*
2759 * Configure the address for reception. Now it is valid.
2760 */
2761
2762 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2763
2764 /* If added prefix is link local and forwarding is off,
2765 start sending router solicitations.
2766 */
2767
2768 if ((ifp->idev->cnf.forwarding == 0 ||
2769 ifp->idev->cnf.forwarding == 2) &&
2770 ifp->idev->cnf.rtr_solicits > 0 &&
2771 (dev->flags&IFF_LOOPBACK) == 0 &&
2772 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2773 struct in6_addr all_routers;
2774
2775 ipv6_addr_all_routers(&all_routers);
2776
2777 /*
2778 * If a host as already performed a random delay
2779 * [...] as part of DAD [...] there is no need
2780 * to delay again before sending the first RS
2781 */
2782 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2783
2784 spin_lock_bh(&ifp->lock);
2785 ifp->probes = 1;
2786 ifp->idev->if_flags |= IF_RS_SENT;
2787 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2788 spin_unlock_bh(&ifp->lock);
2789 }
2790 }
2791
2792 static void addrconf_dad_run(struct inet6_dev *idev) {
2793 struct inet6_ifaddr *ifp;
2794
2795 read_lock_bh(&idev->lock);
2796 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2797 spin_lock_bh(&ifp->lock);
2798 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2799 spin_unlock_bh(&ifp->lock);
2800 continue;
2801 }
2802 spin_unlock_bh(&ifp->lock);
2803 addrconf_dad_kick(ifp);
2804 }
2805 read_unlock_bh(&idev->lock);
2806 }
2807
2808 #ifdef CONFIG_PROC_FS
2809 struct if6_iter_state {
2810 int bucket;
2811 };
2812
2813 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2814 {
2815 struct inet6_ifaddr *ifa = NULL;
2816 struct if6_iter_state *state = seq->private;
2817
2818 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2819 ifa = inet6_addr_lst[state->bucket];
2820 if (ifa)
2821 break;
2822 }
2823 return ifa;
2824 }
2825
2826 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2827 {
2828 struct if6_iter_state *state = seq->private;
2829
2830 ifa = ifa->lst_next;
2831 try_again:
2832 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2833 ifa = inet6_addr_lst[state->bucket];
2834 goto try_again;
2835 }
2836 return ifa;
2837 }
2838
2839 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2840 {
2841 struct inet6_ifaddr *ifa = if6_get_first(seq);
2842
2843 if (ifa)
2844 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2845 --pos;
2846 return pos ? NULL : ifa;
2847 }
2848
2849 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2850 {
2851 read_lock_bh(&addrconf_hash_lock);
2852 return if6_get_idx(seq, *pos);
2853 }
2854
2855 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2856 {
2857 struct inet6_ifaddr *ifa;
2858
2859 ifa = if6_get_next(seq, v);
2860 ++*pos;
2861 return ifa;
2862 }
2863
2864 static void if6_seq_stop(struct seq_file *seq, void *v)
2865 {
2866 read_unlock_bh(&addrconf_hash_lock);
2867 }
2868
2869 static int if6_seq_show(struct seq_file *seq, void *v)
2870 {
2871 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2872 seq_printf(seq,
2873 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2874 NIP6(ifp->addr),
2875 ifp->idev->dev->ifindex,
2876 ifp->prefix_len,
2877 ifp->scope,
2878 ifp->flags,
2879 ifp->idev->dev->name);
2880 return 0;
2881 }
2882
2883 static struct seq_operations if6_seq_ops = {
2884 .start = if6_seq_start,
2885 .next = if6_seq_next,
2886 .show = if6_seq_show,
2887 .stop = if6_seq_stop,
2888 };
2889
2890 static int if6_seq_open(struct inode *inode, struct file *file)
2891 {
2892 return seq_open_private(file, &if6_seq_ops,
2893 sizeof(struct if6_iter_state));
2894 }
2895
2896 static const struct file_operations if6_fops = {
2897 .owner = THIS_MODULE,
2898 .open = if6_seq_open,
2899 .read = seq_read,
2900 .llseek = seq_lseek,
2901 .release = seq_release_private,
2902 };
2903
2904 int __init if6_proc_init(void)
2905 {
2906 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2907 return -ENOMEM;
2908 return 0;
2909 }
2910
2911 void if6_proc_exit(void)
2912 {
2913 proc_net_remove("if_inet6");
2914 }
2915 #endif /* CONFIG_PROC_FS */
2916
2917 #ifdef CONFIG_IPV6_MIP6
2918 /* Check if address is a home address configured on any interface. */
2919 int ipv6_chk_home_addr(struct in6_addr *addr)
2920 {
2921 int ret = 0;
2922 struct inet6_ifaddr * ifp;
2923 unsigned int hash = ipv6_addr_hash(addr);
2924
2925 read_lock_bh(&addrconf_hash_lock);
2926 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2927 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2928 (ifp->flags & IFA_F_HOMEADDRESS)) {
2929 ret = 1;
2930 break;
2931 }
2932 }
2933 read_unlock_bh(&addrconf_hash_lock);
2934 return ret;
2935 }
2936 #endif
2937
2938 /*
2939 * Periodic address status verification
2940 */
2941
2942 static void addrconf_verify(unsigned long foo)
2943 {
2944 struct inet6_ifaddr *ifp;
2945 unsigned long now, next;
2946 int i;
2947
2948 spin_lock_bh(&addrconf_verify_lock);
2949 now = jiffies;
2950 next = now + ADDR_CHECK_FREQUENCY;
2951
2952 del_timer(&addr_chk_timer);
2953
2954 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2955
2956 restart:
2957 read_lock(&addrconf_hash_lock);
2958 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2959 unsigned long age;
2960 #ifdef CONFIG_IPV6_PRIVACY
2961 unsigned long regen_advance;
2962 #endif
2963
2964 if (ifp->flags & IFA_F_PERMANENT)
2965 continue;
2966
2967 spin_lock(&ifp->lock);
2968 age = (now - ifp->tstamp) / HZ;
2969
2970 #ifdef CONFIG_IPV6_PRIVACY
2971 regen_advance = ifp->idev->cnf.regen_max_retry *
2972 ifp->idev->cnf.dad_transmits *
2973 ifp->idev->nd_parms->retrans_time / HZ;
2974 #endif
2975
2976 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2977 age >= ifp->valid_lft) {
2978 spin_unlock(&ifp->lock);
2979 in6_ifa_hold(ifp);
2980 read_unlock(&addrconf_hash_lock);
2981 ipv6_del_addr(ifp);
2982 goto restart;
2983 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2984 spin_unlock(&ifp->lock);
2985 continue;
2986 } else if (age >= ifp->prefered_lft) {
2987 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2988 int deprecate = 0;
2989
2990 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2991 deprecate = 1;
2992 ifp->flags |= IFA_F_DEPRECATED;
2993 }
2994
2995 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2996 next = ifp->tstamp + ifp->valid_lft * HZ;
2997
2998 spin_unlock(&ifp->lock);
2999
3000 if (deprecate) {
3001 in6_ifa_hold(ifp);
3002 read_unlock(&addrconf_hash_lock);
3003
3004 ipv6_ifa_notify(0, ifp);
3005 in6_ifa_put(ifp);
3006 goto restart;
3007 }
3008 #ifdef CONFIG_IPV6_PRIVACY
3009 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3010 !(ifp->flags&IFA_F_TENTATIVE)) {
3011 if (age >= ifp->prefered_lft - regen_advance) {
3012 struct inet6_ifaddr *ifpub = ifp->ifpub;
3013 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3014 next = ifp->tstamp + ifp->prefered_lft * HZ;
3015 if (!ifp->regen_count && ifpub) {
3016 ifp->regen_count++;
3017 in6_ifa_hold(ifp);
3018 in6_ifa_hold(ifpub);
3019 spin_unlock(&ifp->lock);
3020 read_unlock(&addrconf_hash_lock);
3021 spin_lock(&ifpub->lock);
3022 ifpub->regen_count = 0;
3023 spin_unlock(&ifpub->lock);
3024 ipv6_create_tempaddr(ifpub, ifp);
3025 in6_ifa_put(ifpub);
3026 in6_ifa_put(ifp);
3027 goto restart;
3028 }
3029 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3030 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3031 spin_unlock(&ifp->lock);
3032 #endif
3033 } else {
3034 /* ifp->prefered_lft <= ifp->valid_lft */
3035 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3036 next = ifp->tstamp + ifp->prefered_lft * HZ;
3037 spin_unlock(&ifp->lock);
3038 }
3039 }
3040 read_unlock(&addrconf_hash_lock);
3041 }
3042
3043 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3044 add_timer(&addr_chk_timer);
3045 spin_unlock_bh(&addrconf_verify_lock);
3046 }
3047
3048 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3049 {
3050 struct in6_addr *pfx = NULL;
3051
3052 if (addr)
3053 pfx = nla_data(addr);
3054
3055 if (local) {
3056 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3057 pfx = NULL;
3058 else
3059 pfx = nla_data(local);
3060 }
3061
3062 return pfx;
3063 }
3064
3065 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3066 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3067 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3068 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3069 };
3070
3071 static int
3072 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3073 {
3074 struct ifaddrmsg *ifm;
3075 struct nlattr *tb[IFA_MAX+1];
3076 struct in6_addr *pfx;
3077 int err;
3078
3079 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3080 if (err < 0)
3081 return err;
3082
3083 ifm = nlmsg_data(nlh);
3084 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3085 if (pfx == NULL)
3086 return -EINVAL;
3087
3088 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3089 }
3090
3091 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3092 u32 prefered_lft, u32 valid_lft)
3093 {
3094 u32 flags;
3095 clock_t expires;
3096
3097 if (!valid_lft || (prefered_lft > valid_lft))
3098 return -EINVAL;
3099
3100 if (valid_lft == INFINITY_LIFE_TIME) {
3101 ifa_flags |= IFA_F_PERMANENT;
3102 flags = 0;
3103 expires = 0;
3104 } else {
3105 if (valid_lft >= 0x7FFFFFFF/HZ)
3106 valid_lft = 0x7FFFFFFF/HZ;
3107 flags = RTF_EXPIRES;
3108 expires = jiffies_to_clock_t(valid_lft * HZ);
3109 }
3110
3111 if (prefered_lft == 0)
3112 ifa_flags |= IFA_F_DEPRECATED;
3113 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3114 (prefered_lft != INFINITY_LIFE_TIME))
3115 prefered_lft = 0x7FFFFFFF/HZ;
3116
3117 spin_lock_bh(&ifp->lock);
3118 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3119 ifp->tstamp = jiffies;
3120 ifp->valid_lft = valid_lft;
3121 ifp->prefered_lft = prefered_lft;
3122
3123 spin_unlock_bh(&ifp->lock);
3124 if (!(ifp->flags&IFA_F_TENTATIVE))
3125 ipv6_ifa_notify(0, ifp);
3126
3127 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3128 expires, flags);
3129 addrconf_verify(0);
3130
3131 return 0;
3132 }
3133
3134 static int
3135 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3136 {
3137 struct ifaddrmsg *ifm;
3138 struct nlattr *tb[IFA_MAX+1];
3139 struct in6_addr *pfx;
3140 struct inet6_ifaddr *ifa;
3141 struct net_device *dev;
3142 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3143 u8 ifa_flags;
3144 int err;
3145
3146 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3147 if (err < 0)
3148 return err;
3149
3150 ifm = nlmsg_data(nlh);
3151 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3152 if (pfx == NULL)
3153 return -EINVAL;
3154
3155 if (tb[IFA_CACHEINFO]) {
3156 struct ifa_cacheinfo *ci;
3157
3158 ci = nla_data(tb[IFA_CACHEINFO]);
3159 valid_lft = ci->ifa_valid;
3160 preferred_lft = ci->ifa_prefered;
3161 } else {
3162 preferred_lft = INFINITY_LIFE_TIME;
3163 valid_lft = INFINITY_LIFE_TIME;
3164 }
3165
3166 dev = __dev_get_by_index(ifm->ifa_index);
3167 if (dev == NULL)
3168 return -ENODEV;
3169
3170 /* We ignore other flags so far. */
3171 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3172
3173 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3174 if (ifa == NULL) {
3175 /*
3176 * It would be best to check for !NLM_F_CREATE here but
3177 * userspace alreay relies on not having to provide this.
3178 */
3179 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3180 ifa_flags, preferred_lft, valid_lft);
3181 }
3182
3183 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3184 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3185 err = -EEXIST;
3186 else
3187 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3188
3189 in6_ifa_put(ifa);
3190
3191 return err;
3192 }
3193
3194 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3195 u8 scope, int ifindex)
3196 {
3197 struct ifaddrmsg *ifm;
3198
3199 ifm = nlmsg_data(nlh);
3200 ifm->ifa_family = AF_INET6;
3201 ifm->ifa_prefixlen = prefixlen;
3202 ifm->ifa_flags = flags;
3203 ifm->ifa_scope = scope;
3204 ifm->ifa_index = ifindex;
3205 }
3206
3207 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3208 unsigned long tstamp, u32 preferred, u32 valid)
3209 {
3210 struct ifa_cacheinfo ci;
3211
3212 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3213 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3214 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3215 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3216 ci.ifa_prefered = preferred;
3217 ci.ifa_valid = valid;
3218
3219 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3220 }
3221
3222 static inline int rt_scope(int ifa_scope)
3223 {
3224 if (ifa_scope & IFA_HOST)
3225 return RT_SCOPE_HOST;
3226 else if (ifa_scope & IFA_LINK)
3227 return RT_SCOPE_LINK;
3228 else if (ifa_scope & IFA_SITE)
3229 return RT_SCOPE_SITE;
3230 else
3231 return RT_SCOPE_UNIVERSE;
3232 }
3233
3234 static inline int inet6_ifaddr_msgsize(void)
3235 {
3236 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3237 + nla_total_size(16) /* IFA_ADDRESS */
3238 + nla_total_size(sizeof(struct ifa_cacheinfo));
3239 }
3240
3241 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3242 u32 pid, u32 seq, int event, unsigned int flags)
3243 {
3244 struct nlmsghdr *nlh;
3245 u32 preferred, valid;
3246
3247 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3248 if (nlh == NULL)
3249 return -EMSGSIZE;
3250
3251 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3252 ifa->idev->dev->ifindex);
3253
3254 if (!(ifa->flags&IFA_F_PERMANENT)) {
3255 preferred = ifa->prefered_lft;
3256 valid = ifa->valid_lft;
3257 if (preferred != INFINITY_LIFE_TIME) {
3258 long tval = (jiffies - ifa->tstamp)/HZ;
3259 if (preferred > tval)
3260 preferred -= tval;
3261 else
3262 preferred = 0;
3263 if (valid != INFINITY_LIFE_TIME)
3264 valid -= tval;
3265 }
3266 } else {
3267 preferred = INFINITY_LIFE_TIME;
3268 valid = INFINITY_LIFE_TIME;
3269 }
3270
3271 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3272 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3273 nlmsg_cancel(skb, nlh);
3274 return -EMSGSIZE;
3275 }
3276
3277 return nlmsg_end(skb, nlh);
3278 }
3279
3280 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3281 u32 pid, u32 seq, int event, u16 flags)
3282 {
3283 struct nlmsghdr *nlh;
3284 u8 scope = RT_SCOPE_UNIVERSE;
3285 int ifindex = ifmca->idev->dev->ifindex;
3286
3287 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3288 scope = RT_SCOPE_SITE;
3289
3290 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3291 if (nlh == NULL)
3292 return -EMSGSIZE;
3293
3294 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3295 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3296 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3297 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3298 nlmsg_cancel(skb, nlh);
3299 return -EMSGSIZE;
3300 }
3301
3302 return nlmsg_end(skb, nlh);
3303 }
3304
3305 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3306 u32 pid, u32 seq, int event, unsigned int flags)
3307 {
3308 struct nlmsghdr *nlh;
3309 u8 scope = RT_SCOPE_UNIVERSE;
3310 int ifindex = ifaca->aca_idev->dev->ifindex;
3311
3312 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3313 scope = RT_SCOPE_SITE;
3314
3315 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3316 if (nlh == NULL)
3317 return -EMSGSIZE;
3318
3319 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3320 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3321 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3322 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3323 nlmsg_cancel(skb, nlh);
3324 return -EMSGSIZE;
3325 }
3326
3327 return nlmsg_end(skb, nlh);
3328 }
3329
3330 enum addr_type_t
3331 {
3332 UNICAST_ADDR,
3333 MULTICAST_ADDR,
3334 ANYCAST_ADDR,
3335 };
3336
3337 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3338 enum addr_type_t type)
3339 {
3340 int idx, ip_idx;
3341 int s_idx, s_ip_idx;
3342 int err = 1;
3343 struct net_device *dev;
3344 struct inet6_dev *idev = NULL;
3345 struct inet6_ifaddr *ifa;
3346 struct ifmcaddr6 *ifmca;
3347 struct ifacaddr6 *ifaca;
3348
3349 s_idx = cb->args[0];
3350 s_ip_idx = ip_idx = cb->args[1];
3351
3352 idx = 0;
3353 for_each_netdev(dev) {
3354 if (idx < s_idx)
3355 goto cont;
3356 if (idx > s_idx)
3357 s_ip_idx = 0;
3358 ip_idx = 0;
3359 if ((idev = in6_dev_get(dev)) == NULL)
3360 goto cont;
3361 read_lock_bh(&idev->lock);
3362 switch (type) {
3363 case UNICAST_ADDR:
3364 /* unicast address incl. temp addr */
3365 for (ifa = idev->addr_list; ifa;
3366 ifa = ifa->if_next, ip_idx++) {
3367 if (ip_idx < s_ip_idx)
3368 continue;
3369 if ((err = inet6_fill_ifaddr(skb, ifa,
3370 NETLINK_CB(cb->skb).pid,
3371 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3372 NLM_F_MULTI)) <= 0)
3373 goto done;
3374 }
3375 break;
3376 case MULTICAST_ADDR:
3377 /* multicast address */
3378 for (ifmca = idev->mc_list; ifmca;
3379 ifmca = ifmca->next, ip_idx++) {
3380 if (ip_idx < s_ip_idx)
3381 continue;
3382 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3383 NETLINK_CB(cb->skb).pid,
3384 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3385 NLM_F_MULTI)) <= 0)
3386 goto done;
3387 }
3388 break;
3389 case ANYCAST_ADDR:
3390 /* anycast address */
3391 for (ifaca = idev->ac_list; ifaca;
3392 ifaca = ifaca->aca_next, ip_idx++) {
3393 if (ip_idx < s_ip_idx)
3394 continue;
3395 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3396 NETLINK_CB(cb->skb).pid,
3397 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3398 NLM_F_MULTI)) <= 0)
3399 goto done;
3400 }
3401 break;
3402 default:
3403 break;
3404 }
3405 read_unlock_bh(&idev->lock);
3406 in6_dev_put(idev);
3407 cont:
3408 idx++;
3409 }
3410 done:
3411 if (err <= 0) {
3412 read_unlock_bh(&idev->lock);
3413 in6_dev_put(idev);
3414 }
3415 cb->args[0] = idx;
3416 cb->args[1] = ip_idx;
3417 return skb->len;
3418 }
3419
3420 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3421 {
3422 enum addr_type_t type = UNICAST_ADDR;
3423 return inet6_dump_addr(skb, cb, type);
3424 }
3425
3426 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3427 {
3428 enum addr_type_t type = MULTICAST_ADDR;
3429 return inet6_dump_addr(skb, cb, type);
3430 }
3431
3432
3433 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3434 {
3435 enum addr_type_t type = ANYCAST_ADDR;
3436 return inet6_dump_addr(skb, cb, type);
3437 }
3438
3439 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3440 void *arg)
3441 {
3442 struct ifaddrmsg *ifm;
3443 struct nlattr *tb[IFA_MAX+1];
3444 struct in6_addr *addr = NULL;
3445 struct net_device *dev = NULL;
3446 struct inet6_ifaddr *ifa;
3447 struct sk_buff *skb;
3448 int err;
3449
3450 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3451 if (err < 0)
3452 goto errout;
3453
3454 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3455 if (addr == NULL) {
3456 err = -EINVAL;
3457 goto errout;
3458 }
3459
3460 ifm = nlmsg_data(nlh);
3461 if (ifm->ifa_index)
3462 dev = __dev_get_by_index(ifm->ifa_index);
3463
3464 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3465 err = -EADDRNOTAVAIL;
3466 goto errout;
3467 }
3468
3469 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3470 err = -ENOBUFS;
3471 goto errout_ifa;
3472 }
3473
3474 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3475 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3476 if (err < 0) {
3477 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3478 WARN_ON(err == -EMSGSIZE);
3479 kfree_skb(skb);
3480 goto errout_ifa;
3481 }
3482 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3483 errout_ifa:
3484 in6_ifa_put(ifa);
3485 errout:
3486 return err;
3487 }
3488
3489 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3490 {
3491 struct sk_buff *skb;
3492 int err = -ENOBUFS;
3493
3494 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3495 if (skb == NULL)
3496 goto errout;
3497
3498 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3499 if (err < 0) {
3500 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3501 WARN_ON(err == -EMSGSIZE);
3502 kfree_skb(skb);
3503 goto errout;
3504 }
3505 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3506 errout:
3507 if (err < 0)
3508 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3509 }
3510
3511 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3512 __s32 *array, int bytes)
3513 {
3514 BUG_ON(bytes < (DEVCONF_MAX * 4));
3515
3516 memset(array, 0, bytes);
3517 array[DEVCONF_FORWARDING] = cnf->forwarding;
3518 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3519 array[DEVCONF_MTU6] = cnf->mtu6;
3520 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3521 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3522 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3523 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3524 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3525 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3526 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3527 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3528 #ifdef CONFIG_IPV6_PRIVACY
3529 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3530 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3531 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3532 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3533 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3534 #endif
3535 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3536 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3537 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3538 #ifdef CONFIG_IPV6_ROUTER_PREF
3539 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3540 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3541 #ifdef CONFIG_IPV6_ROUTE_INFO
3542 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3543 #endif
3544 #endif
3545 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3546 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3547 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3548 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3549 #endif
3550 #ifdef CONFIG_IPV6_MROUTE
3551 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3552 #endif
3553 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3554 }
3555
3556 static inline size_t inet6_if_nlmsg_size(void)
3557 {
3558 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3559 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3560 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3561 + nla_total_size(4) /* IFLA_MTU */
3562 + nla_total_size(4) /* IFLA_LINK */
3563 + nla_total_size( /* IFLA_PROTINFO */
3564 nla_total_size(4) /* IFLA_INET6_FLAGS */
3565 + nla_total_size(sizeof(struct ifla_cacheinfo))
3566 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3567 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3568 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3569 );
3570 }
3571
3572 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3573 int bytes)
3574 {
3575 int i;
3576 int pad = bytes - sizeof(u64) * items;
3577 BUG_ON(pad < 0);
3578
3579 /* Use put_unaligned() because stats may not be aligned for u64. */
3580 put_unaligned(items, &stats[0]);
3581 for (i = 1; i < items; i++)
3582 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3583
3584 memset(&stats[items], 0, pad);
3585 }
3586
3587 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3588 int bytes)
3589 {
3590 switch(attrtype) {
3591 case IFLA_INET6_STATS:
3592 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3593 break;
3594 case IFLA_INET6_ICMP6STATS:
3595 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3596 break;
3597 }
3598 }
3599
3600 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3601 u32 pid, u32 seq, int event, unsigned int flags)
3602 {
3603 struct net_device *dev = idev->dev;
3604 struct nlattr *nla;
3605 struct ifinfomsg *hdr;
3606 struct nlmsghdr *nlh;
3607 void *protoinfo;
3608 struct ifla_cacheinfo ci;
3609
3610 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3611 if (nlh == NULL)
3612 return -EMSGSIZE;
3613
3614 hdr = nlmsg_data(nlh);
3615 hdr->ifi_family = AF_INET6;
3616 hdr->__ifi_pad = 0;
3617 hdr->ifi_type = dev->type;
3618 hdr->ifi_index = dev->ifindex;
3619 hdr->ifi_flags = dev_get_flags(dev);
3620 hdr->ifi_change = 0;
3621
3622 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3623
3624 if (dev->addr_len)
3625 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3626
3627 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3628 if (dev->ifindex != dev->iflink)
3629 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3630
3631 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3632 if (protoinfo == NULL)
3633 goto nla_put_failure;
3634
3635 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3636
3637 ci.max_reasm_len = IPV6_MAXPLEN;
3638 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3639 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3640 ci.reachable_time = idev->nd_parms->reachable_time;
3641 ci.retrans_time = idev->nd_parms->retrans_time;
3642 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3643
3644 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3645 if (nla == NULL)
3646 goto nla_put_failure;
3647 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3648
3649 /* XXX - MC not implemented */
3650
3651 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3652 if (nla == NULL)
3653 goto nla_put_failure;
3654 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3655
3656 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3657 if (nla == NULL)
3658 goto nla_put_failure;
3659 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3660
3661 nla_nest_end(skb, protoinfo);
3662 return nlmsg_end(skb, nlh);
3663
3664 nla_put_failure:
3665 nlmsg_cancel(skb, nlh);
3666 return -EMSGSIZE;
3667 }
3668
3669 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3670 {
3671 int idx, err;
3672 int s_idx = cb->args[0];
3673 struct net_device *dev;
3674 struct inet6_dev *idev;
3675
3676 read_lock(&dev_base_lock);
3677 idx = 0;
3678 for_each_netdev(dev) {
3679 if (idx < s_idx)
3680 goto cont;
3681 if ((idev = in6_dev_get(dev)) == NULL)
3682 goto cont;
3683 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3684 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3685 in6_dev_put(idev);
3686 if (err <= 0)
3687 break;
3688 cont:
3689 idx++;
3690 }
3691 read_unlock(&dev_base_lock);
3692 cb->args[0] = idx;
3693
3694 return skb->len;
3695 }
3696
3697 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3698 {
3699 struct sk_buff *skb;
3700 int err = -ENOBUFS;
3701
3702 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3703 if (skb == NULL)
3704 goto errout;
3705
3706 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3707 if (err < 0) {
3708 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3709 WARN_ON(err == -EMSGSIZE);
3710 kfree_skb(skb);
3711 goto errout;
3712 }
3713 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
3714 errout:
3715 if (err < 0)
3716 rtnl_set_sk_err(RTNLGRP_IPV6_IFINFO, err);
3717 }
3718
3719 static inline size_t inet6_prefix_nlmsg_size(void)
3720 {
3721 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3722 + nla_total_size(sizeof(struct in6_addr))
3723 + nla_total_size(sizeof(struct prefix_cacheinfo));
3724 }
3725
3726 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3727 struct prefix_info *pinfo, u32 pid, u32 seq,
3728 int event, unsigned int flags)
3729 {
3730 struct prefixmsg *pmsg;
3731 struct nlmsghdr *nlh;
3732 struct prefix_cacheinfo ci;
3733
3734 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3735 if (nlh == NULL)
3736 return -EMSGSIZE;
3737
3738 pmsg = nlmsg_data(nlh);
3739 pmsg->prefix_family = AF_INET6;
3740 pmsg->prefix_pad1 = 0;
3741 pmsg->prefix_pad2 = 0;
3742 pmsg->prefix_ifindex = idev->dev->ifindex;
3743 pmsg->prefix_len = pinfo->prefix_len;
3744 pmsg->prefix_type = pinfo->type;
3745 pmsg->prefix_pad3 = 0;
3746 pmsg->prefix_flags = 0;
3747 if (pinfo->onlink)
3748 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3749 if (pinfo->autoconf)
3750 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3751
3752 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3753
3754 ci.preferred_time = ntohl(pinfo->prefered);
3755 ci.valid_time = ntohl(pinfo->valid);
3756 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3757
3758 return nlmsg_end(skb, nlh);
3759
3760 nla_put_failure:
3761 nlmsg_cancel(skb, nlh);
3762 return -EMSGSIZE;
3763 }
3764
3765 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3766 struct prefix_info *pinfo)
3767 {
3768 struct sk_buff *skb;
3769 int err = -ENOBUFS;
3770
3771 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3772 if (skb == NULL)
3773 goto errout;
3774
3775 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3776 if (err < 0) {
3777 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3778 WARN_ON(err == -EMSGSIZE);
3779 kfree_skb(skb);
3780 goto errout;
3781 }
3782 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3783 errout:
3784 if (err < 0)
3785 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3786 }
3787
3788 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3789 {
3790 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3791
3792 switch (event) {
3793 case RTM_NEWADDR:
3794 /*
3795 * If the address was optimistic
3796 * we inserted the route at the start of
3797 * our DAD process, so we don't need
3798 * to do it again
3799 */
3800 if (!(ifp->rt->rt6i_node))
3801 ip6_ins_rt(ifp->rt);
3802 if (ifp->idev->cnf.forwarding)
3803 addrconf_join_anycast(ifp);
3804 break;
3805 case RTM_DELADDR:
3806 if (ifp->idev->cnf.forwarding)
3807 addrconf_leave_anycast(ifp);
3808 addrconf_leave_solict(ifp->idev, &ifp->addr);
3809 dst_hold(&ifp->rt->u.dst);
3810 if (ip6_del_rt(ifp->rt))
3811 dst_free(&ifp->rt->u.dst);
3812 break;
3813 }
3814 }
3815
3816 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3817 {
3818 rcu_read_lock_bh();
3819 if (likely(ifp->idev->dead == 0))
3820 __ipv6_ifa_notify(event, ifp);
3821 rcu_read_unlock_bh();
3822 }
3823
3824 #ifdef CONFIG_SYSCTL
3825
3826 static
3827 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3828 void __user *buffer, size_t *lenp, loff_t *ppos)
3829 {
3830 int *valp = ctl->data;
3831 int val = *valp;
3832 int ret;
3833
3834 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3835
3836 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3837 if (valp != &ipv6_devconf.forwarding) {
3838 if ((!*valp) ^ (!val)) {
3839 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3840 if (idev == NULL)
3841 return ret;
3842 dev_forward_change(idev);
3843 }
3844 } else {
3845 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3846 addrconf_forward_change();
3847 }
3848 if (*valp)
3849 rt6_purge_dflt_routers();
3850 }
3851
3852 return ret;
3853 }
3854
3855 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3856 int __user *name, int nlen,
3857 void __user *oldval,
3858 size_t __user *oldlenp,
3859 void __user *newval, size_t newlen)
3860 {
3861 int *valp = table->data;
3862 int new;
3863
3864 if (!newval || !newlen)
3865 return 0;
3866 if (newlen != sizeof(int))
3867 return -EINVAL;
3868 if (get_user(new, (int __user *)newval))
3869 return -EFAULT;
3870 if (new == *valp)
3871 return 0;
3872 if (oldval && oldlenp) {
3873 size_t len;
3874 if (get_user(len, oldlenp))
3875 return -EFAULT;
3876 if (len) {
3877 if (len > table->maxlen)
3878 len = table->maxlen;
3879 if (copy_to_user(oldval, valp, len))
3880 return -EFAULT;
3881 if (put_user(len, oldlenp))
3882 return -EFAULT;
3883 }
3884 }
3885
3886 if (valp != &ipv6_devconf_dflt.forwarding) {
3887 if (valp != &ipv6_devconf.forwarding) {
3888 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3889 int changed;
3890 if (unlikely(idev == NULL))
3891 return -ENODEV;
3892 changed = (!*valp) ^ (!new);
3893 *valp = new;
3894 if (changed)
3895 dev_forward_change(idev);
3896 } else {
3897 *valp = new;
3898 addrconf_forward_change();
3899 }
3900
3901 if (*valp)
3902 rt6_purge_dflt_routers();
3903 } else
3904 *valp = new;
3905
3906 return 1;
3907 }
3908
3909 static void dev_disable_change(struct inet6_dev *idev)
3910 {
3911 if (!idev || !idev->dev)
3912 return;
3913
3914 if (idev->cnf.disable_ipv6)
3915 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
3916 else
3917 addrconf_notify(NULL, NETDEV_UP, idev->dev);
3918 }
3919
3920 static int addrconf_disable_ipv6(struct ctl_table *table, int *valp, int old)
3921 {
3922 if (valp == &ipv6_devconf_dflt.disable_ipv6)
3923 return 0;
3924
3925 if (!rtnl_trylock()) {
3926 /* Restore the original values before restarting */
3927 *valp = old;
3928 return restart_syscall();
3929 }
3930
3931 if (valp == &ipv6_devconf.disable_ipv6) {
3932 struct net_device *dev;
3933 struct inet6_dev *idev;
3934
3935 read_lock(&dev_base_lock);
3936 for_each_netdev(dev) {
3937 rcu_read_lock();
3938 idev = __in6_dev_get(dev);
3939 if (idev) {
3940 int changed = (!idev->cnf.disable_ipv6) ^ (!*valp);
3941 idev->cnf.disable_ipv6 = *valp;
3942 if (changed)
3943 dev_disable_change(idev);
3944 }
3945 rcu_read_unlock();
3946 }
3947 read_unlock(&dev_base_lock);
3948 }
3949
3950 rtnl_unlock();
3951 return 0;
3952 }
3953
3954 static int addrconf_sysctl_disable(ctl_table *ctl, int write, struct file * filp,
3955 void __user *buffer, size_t *lenp, loff_t *ppos)
3956 {
3957 int *valp = ctl->data;
3958 int val = *valp;
3959 loff_t pos = *ppos;
3960 int ret;
3961
3962 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3963
3964 if (write)
3965 ret = addrconf_disable_ipv6(ctl, valp, val);
3966 if (ret)
3967 *ppos = pos;
3968 return ret;
3969 }
3970
3971 static struct addrconf_sysctl_table
3972 {
3973 struct ctl_table_header *sysctl_header;
3974 ctl_table addrconf_vars[__NET_IPV6_MAX];
3975 ctl_table addrconf_dev[2];
3976 ctl_table addrconf_conf_dir[2];
3977 ctl_table addrconf_proto_dir[2];
3978 ctl_table addrconf_root_dir[2];
3979 } addrconf_sysctl __read_mostly = {
3980 .sysctl_header = NULL,
3981 .addrconf_vars = {
3982 {
3983 .ctl_name = NET_IPV6_FORWARDING,
3984 .procname = "forwarding",
3985 .data = &ipv6_devconf.forwarding,
3986 .maxlen = sizeof(int),
3987 .mode = 0644,
3988 .proc_handler = &addrconf_sysctl_forward,
3989 .strategy = &addrconf_sysctl_forward_strategy,
3990 },
3991 {
3992 .ctl_name = NET_IPV6_HOP_LIMIT,
3993 .procname = "hop_limit",
3994 .data = &ipv6_devconf.hop_limit,
3995 .maxlen = sizeof(int),
3996 .mode = 0644,
3997 .proc_handler = proc_dointvec,
3998 },
3999 {
4000 .ctl_name = NET_IPV6_MTU,
4001 .procname = "mtu",
4002 .data = &ipv6_devconf.mtu6,
4003 .maxlen = sizeof(int),
4004 .mode = 0644,
4005 .proc_handler = &proc_dointvec,
4006 },
4007 {
4008 .ctl_name = NET_IPV6_ACCEPT_RA,
4009 .procname = "accept_ra",
4010 .data = &ipv6_devconf.accept_ra,
4011 .maxlen = sizeof(int),
4012 .mode = 0644,
4013 .proc_handler = &proc_dointvec,
4014 },
4015 {
4016 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
4017 .procname = "accept_redirects",
4018 .data = &ipv6_devconf.accept_redirects,
4019 .maxlen = sizeof(int),
4020 .mode = 0644,
4021 .proc_handler = &proc_dointvec,
4022 },
4023 {
4024 .ctl_name = NET_IPV6_AUTOCONF,
4025 .procname = "autoconf",
4026 .data = &ipv6_devconf.autoconf,
4027 .maxlen = sizeof(int),
4028 .mode = 0644,
4029 .proc_handler = &proc_dointvec,
4030 },
4031 {
4032 .ctl_name = NET_IPV6_DAD_TRANSMITS,
4033 .procname = "dad_transmits",
4034 .data = &ipv6_devconf.dad_transmits,
4035 .maxlen = sizeof(int),
4036 .mode = 0644,
4037 .proc_handler = &proc_dointvec,
4038 },
4039 {
4040 .ctl_name = NET_IPV6_RTR_SOLICITS,
4041 .procname = "router_solicitations",
4042 .data = &ipv6_devconf.rtr_solicits,
4043 .maxlen = sizeof(int),
4044 .mode = 0644,
4045 .proc_handler = &proc_dointvec,
4046 },
4047 {
4048 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
4049 .procname = "router_solicitation_interval",
4050 .data = &ipv6_devconf.rtr_solicit_interval,
4051 .maxlen = sizeof(int),
4052 .mode = 0644,
4053 .proc_handler = &proc_dointvec_jiffies,
4054 .strategy = &sysctl_jiffies,
4055 },
4056 {
4057 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
4058 .procname = "router_solicitation_delay",
4059 .data = &ipv6_devconf.rtr_solicit_delay,
4060 .maxlen = sizeof(int),
4061 .mode = 0644,
4062 .proc_handler = &proc_dointvec_jiffies,
4063 .strategy = &sysctl_jiffies,
4064 },
4065 {
4066 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
4067 .procname = "force_mld_version",
4068 .data = &ipv6_devconf.force_mld_version,
4069 .maxlen = sizeof(int),
4070 .mode = 0644,
4071 .proc_handler = &proc_dointvec,
4072 },
4073 #ifdef CONFIG_IPV6_PRIVACY
4074 {
4075 .ctl_name = NET_IPV6_USE_TEMPADDR,
4076 .procname = "use_tempaddr",
4077 .data = &ipv6_devconf.use_tempaddr,
4078 .maxlen = sizeof(int),
4079 .mode = 0644,
4080 .proc_handler = &proc_dointvec,
4081 },
4082 {
4083 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
4084 .procname = "temp_valid_lft",
4085 .data = &ipv6_devconf.temp_valid_lft,
4086 .maxlen = sizeof(int),
4087 .mode = 0644,
4088 .proc_handler = &proc_dointvec,
4089 },
4090 {
4091 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4092 .procname = "temp_prefered_lft",
4093 .data = &ipv6_devconf.temp_prefered_lft,
4094 .maxlen = sizeof(int),
4095 .mode = 0644,
4096 .proc_handler = &proc_dointvec,
4097 },
4098 {
4099 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4100 .procname = "regen_max_retry",
4101 .data = &ipv6_devconf.regen_max_retry,
4102 .maxlen = sizeof(int),
4103 .mode = 0644,
4104 .proc_handler = &proc_dointvec,
4105 },
4106 {
4107 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4108 .procname = "max_desync_factor",
4109 .data = &ipv6_devconf.max_desync_factor,
4110 .maxlen = sizeof(int),
4111 .mode = 0644,
4112 .proc_handler = &proc_dointvec,
4113 },
4114 #endif
4115 {
4116 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4117 .procname = "max_addresses",
4118 .data = &ipv6_devconf.max_addresses,
4119 .maxlen = sizeof(int),
4120 .mode = 0644,
4121 .proc_handler = &proc_dointvec,
4122 },
4123 {
4124 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4125 .procname = "accept_ra_defrtr",
4126 .data = &ipv6_devconf.accept_ra_defrtr,
4127 .maxlen = sizeof(int),
4128 .mode = 0644,
4129 .proc_handler = &proc_dointvec,
4130 },
4131 {
4132 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4133 .procname = "accept_ra_pinfo",
4134 .data = &ipv6_devconf.accept_ra_pinfo,
4135 .maxlen = sizeof(int),
4136 .mode = 0644,
4137 .proc_handler = &proc_dointvec,
4138 },
4139 #ifdef CONFIG_IPV6_ROUTER_PREF
4140 {
4141 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4142 .procname = "accept_ra_rtr_pref",
4143 .data = &ipv6_devconf.accept_ra_rtr_pref,
4144 .maxlen = sizeof(int),
4145 .mode = 0644,
4146 .proc_handler = &proc_dointvec,
4147 },
4148 {
4149 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4150 .procname = "router_probe_interval",
4151 .data = &ipv6_devconf.rtr_probe_interval,
4152 .maxlen = sizeof(int),
4153 .mode = 0644,
4154 .proc_handler = &proc_dointvec_jiffies,
4155 .strategy = &sysctl_jiffies,
4156 },
4157 #ifdef CONFIG_IPV6_ROUTE_INFO
4158 {
4159 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4160 .procname = "accept_ra_rt_info_max_plen",
4161 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4162 .maxlen = sizeof(int),
4163 .mode = 0644,
4164 .proc_handler = &proc_dointvec,
4165 },
4166 #endif
4167 #endif
4168 {
4169 .ctl_name = NET_IPV6_PROXY_NDP,
4170 .procname = "proxy_ndp",
4171 .data = &ipv6_devconf.proxy_ndp,
4172 .maxlen = sizeof(int),
4173 .mode = 0644,
4174 .proc_handler = &proc_dointvec,
4175 },
4176 {
4177 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4178 .procname = "accept_source_route",
4179 .data = &ipv6_devconf.accept_source_route,
4180 .maxlen = sizeof(int),
4181 .mode = 0644,
4182 .proc_handler = &proc_dointvec,
4183 },
4184 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4185 {
4186 .ctl_name = CTL_UNNUMBERED,
4187 .procname = "optimistic_dad",
4188 .data = &ipv6_devconf.optimistic_dad,
4189 .maxlen = sizeof(int),
4190 .mode = 0644,
4191 .proc_handler = &proc_dointvec,
4192
4193 },
4194 #endif
4195 #ifdef CONFIG_IPV6_MROUTE
4196 {
4197 .ctl_name = CTL_UNNUMBERED,
4198 .procname = "mc_forwarding",
4199 .data = &ipv6_devconf.mc_forwarding,
4200 .maxlen = sizeof(int),
4201 .mode = 0644,
4202 .proc_handler = &proc_dointvec,
4203 },
4204 #endif
4205 {
4206 .ctl_name = CTL_UNNUMBERED,
4207 .procname = "disable_ipv6",
4208 .data = &ipv6_devconf.disable_ipv6,
4209 .maxlen = sizeof(int),
4210 .mode = 0644,
4211 .proc_handler = &addrconf_sysctl_disable,
4212 },
4213 {
4214 .ctl_name = 0, /* sentinel */
4215 }
4216 },
4217 .addrconf_dev = {
4218 {
4219 .ctl_name = NET_PROTO_CONF_ALL,
4220 .procname = "all",
4221 .mode = 0555,
4222 .child = addrconf_sysctl.addrconf_vars,
4223 },
4224 {
4225 .ctl_name = 0, /* sentinel */
4226 }
4227 },
4228 .addrconf_conf_dir = {
4229 {
4230 .ctl_name = NET_IPV6_CONF,
4231 .procname = "conf",
4232 .mode = 0555,
4233 .child = addrconf_sysctl.addrconf_dev,
4234 },
4235 {
4236 .ctl_name = 0, /* sentinel */
4237 }
4238 },
4239 .addrconf_proto_dir = {
4240 {
4241 .ctl_name = NET_IPV6,
4242 .procname = "ipv6",
4243 .mode = 0555,
4244 .child = addrconf_sysctl.addrconf_conf_dir,
4245 },
4246 {
4247 .ctl_name = 0, /* sentinel */
4248 }
4249 },
4250 .addrconf_root_dir = {
4251 {
4252 .ctl_name = CTL_NET,
4253 .procname = "net",
4254 .mode = 0555,
4255 .child = addrconf_sysctl.addrconf_proto_dir,
4256 },
4257 {
4258 .ctl_name = 0, /* sentinel */
4259 }
4260 },
4261 };
4262
4263 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4264 {
4265 int i;
4266 struct net_device *dev = idev ? idev->dev : NULL;
4267 struct addrconf_sysctl_table *t;
4268 char *dev_name = NULL;
4269
4270 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4271 if (t == NULL)
4272 return;
4273 for (i=0; t->addrconf_vars[i].data; i++) {
4274 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4275 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4276 }
4277 if (dev) {
4278 dev_name = dev->name;
4279 t->addrconf_dev[0].ctl_name = dev->ifindex;
4280 } else {
4281 dev_name = "default";
4282 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4283 }
4284
4285 /*
4286 * Make a copy of dev_name, because '.procname' is regarded as const
4287 * by sysctl and we wouldn't want anyone to change it under our feet
4288 * (see SIOCSIFNAME).
4289 */
4290 dev_name = kstrdup(dev_name, GFP_KERNEL);
4291 if (!dev_name)
4292 goto free;
4293
4294 t->addrconf_dev[0].procname = dev_name;
4295
4296 t->addrconf_dev[0].child = t->addrconf_vars;
4297 t->addrconf_conf_dir[0].child = t->addrconf_dev;
4298 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
4299 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
4300
4301 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
4302 if (t->sysctl_header == NULL)
4303 goto free_procname;
4304 else
4305 p->sysctl = t;
4306 return;
4307
4308 /* error path */
4309 free_procname:
4310 kfree(dev_name);
4311 free:
4312 kfree(t);
4313
4314 return;
4315 }
4316
4317 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4318 {
4319 if (p->sysctl) {
4320 struct addrconf_sysctl_table *t = p->sysctl;
4321 p->sysctl = NULL;
4322 unregister_sysctl_table(t->sysctl_header);
4323 kfree(t->addrconf_dev[0].procname);
4324 kfree(t);
4325 }
4326 }
4327
4328
4329 #endif
4330
4331 /*
4332 * Device notifier
4333 */
4334
4335 int register_inet6addr_notifier(struct notifier_block *nb)
4336 {
4337 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4338 }
4339
4340 EXPORT_SYMBOL(register_inet6addr_notifier);
4341
4342 int unregister_inet6addr_notifier(struct notifier_block *nb)
4343 {
4344 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4345 }
4346
4347 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4348
4349 /*
4350 * Init / cleanup code
4351 */
4352
4353 int __init addrconf_init(void)
4354 {
4355 int err = 0;
4356
4357 /* The addrconf netdev notifier requires that loopback_dev
4358 * has it's ipv6 private information allocated and setup
4359 * before it can bring up and give link-local addresses
4360 * to other devices which are up.
4361 *
4362 * Unfortunately, loopback_dev is not necessarily the first
4363 * entry in the global dev_base list of net devices. In fact,
4364 * it is likely to be the very last entry on that list.
4365 * So this causes the notifier registry below to try and
4366 * give link-local addresses to all devices besides loopback_dev
4367 * first, then loopback_dev, which cases all the non-loopback_dev
4368 * devices to fail to get a link-local address.
4369 *
4370 * So, as a temporary fix, allocate the ipv6 structure for
4371 * loopback_dev first by hand.
4372 * Longer term, all of the dependencies ipv6 has upon the loopback
4373 * device and it being up should be removed.
4374 */
4375 rtnl_lock();
4376 if (!ipv6_add_dev(&loopback_dev))
4377 err = -ENOMEM;
4378 rtnl_unlock();
4379 if (err)
4380 return err;
4381
4382 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4383 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4384 ip6_prohibit_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4385 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4386 #endif
4387
4388 register_netdevice_notifier(&ipv6_dev_notf);
4389
4390 addrconf_verify(0);
4391
4392 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4393 if (err < 0)
4394 goto errout;
4395
4396 /* Only the first call to __rtnl_register can fail */
4397 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4398 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4399 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4400 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4401 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4402
4403 #ifdef CONFIG_SYSCTL
4404 addrconf_sysctl.sysctl_header =
4405 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
4406 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4407 #endif
4408
4409 return 0;
4410 errout:
4411 unregister_netdevice_notifier(&ipv6_dev_notf);
4412
4413 return err;
4414 }
4415
4416 void __exit addrconf_cleanup(void)
4417 {
4418 struct net_device *dev;
4419 struct inet6_dev *idev;
4420 struct inet6_ifaddr *ifa;
4421 int i;
4422
4423 unregister_netdevice_notifier(&ipv6_dev_notf);
4424
4425 #ifdef CONFIG_SYSCTL
4426 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4427 addrconf_sysctl_unregister(&ipv6_devconf);
4428 #endif
4429
4430 rtnl_lock();
4431
4432 /*
4433 * clean dev list.
4434 */
4435
4436 for_each_netdev(dev) {
4437 if ((idev = __in6_dev_get(dev)) == NULL)
4438 continue;
4439 addrconf_ifdown(dev, 1);
4440 }
4441 addrconf_ifdown(&loopback_dev, 2);
4442
4443 /*
4444 * Check hash table.
4445 */
4446
4447 write_lock_bh(&addrconf_hash_lock);
4448 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4449 for (ifa=inet6_addr_lst[i]; ifa; ) {
4450 struct inet6_ifaddr *bifa;
4451
4452 bifa = ifa;
4453 ifa = ifa->lst_next;
4454 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4455 /* Do not free it; something is wrong.
4456 Now we can investigate it with debugger.
4457 */
4458 }
4459 }
4460 write_unlock_bh(&addrconf_hash_lock);
4461
4462 del_timer(&addr_chk_timer);
4463
4464 rtnl_unlock();
4465
4466 #ifdef CONFIG_PROC_FS
4467 proc_net_remove("if_inet6");
4468 #endif
4469 }
Tomato firmware and modifications.