?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
bonding / ipv6: no addrconf for slaves separately from master.
[tomato.git] / release / src-rt / linux / linux-2.6 / net / ipv6 / addrconf.c
blobee2861fbc586ab95ecf4464155cc5afade0544f1
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, int dad_failed)
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 if (dad_failed)
1329 ifp->flags |= IFA_F_DADFAILED;
1330 spin_unlock_bh(&ifp->lock);
1331 if (dad_failed)
1332 ipv6_ifa_notify(0, ifp);
1333 in6_ifa_put(ifp);
1334 #ifdef CONFIG_IPV6_PRIVACY
1335 } else if (ifp->flags&IFA_F_TEMPORARY) {
1336 struct inet6_ifaddr *ifpub;
1337 spin_lock_bh(&ifp->lock);
1338 ifpub = ifp->ifpub;
1339 if (ifpub) {
1340 in6_ifa_hold(ifpub);
1341 spin_unlock_bh(&ifp->lock);
1342 ipv6_create_tempaddr(ifpub, ifp);
1343 in6_ifa_put(ifpub);
1344 } else {
1345 spin_unlock_bh(&ifp->lock);
1346 }
1347 ipv6_del_addr(ifp);
1348 #endif
1349 } else
1350 ipv6_del_addr(ifp);
1351 }
1352
1353 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1354 {
1355 if (net_ratelimit())
1356 printk(KERN_INFO "%s: IPv6 duplicate address detected!\n",
1357 ifp->idev->dev->name);
1358
1359 addrconf_dad_stop(ifp, 1);
1360 }
1361
1362 /* Join to solicited addr multicast group. */
1363
1364 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1365 {
1366 struct in6_addr maddr;
1367
1368 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1369 return;
1370
1371 addrconf_addr_solict_mult(addr, &maddr);
1372 ipv6_dev_mc_inc(dev, &maddr);
1373 }
1374
1375 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1376 {
1377 struct in6_addr maddr;
1378
1379 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1380 return;
1381
1382 addrconf_addr_solict_mult(addr, &maddr);
1383 __ipv6_dev_mc_dec(idev, &maddr);
1384 }
1385
1386 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1387 {
1388 struct in6_addr addr;
1389 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1390 if (ipv6_addr_any(&addr))
1391 return;
1392 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1393 }
1394
1395 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1396 {
1397 struct in6_addr addr;
1398 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1399 if (ipv6_addr_any(&addr))
1400 return;
1401 __ipv6_dev_ac_dec(ifp->idev, &addr);
1402 }
1403
1404 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1405 {
1406 if (dev->addr_len != ETH_ALEN)
1407 return -1;
1408 memcpy(eui, dev->dev_addr, 3);
1409 memcpy(eui + 5, dev->dev_addr + 3, 3);
1410
1411 /*
1412 * The zSeries OSA network cards can be shared among various
1413 * OS instances, but the OSA cards have only one MAC address.
1414 * This leads to duplicate address conflicts in conjunction
1415 * with IPv6 if more than one instance uses the same card.
1416 *
1417 * The driver for these cards can deliver a unique 16-bit
1418 * identifier for each instance sharing the same card. It is
1419 * placed instead of 0xFFFE in the interface identifier. The
1420 * "u" bit of the interface identifier is not inverted in this
1421 * case. Hence the resulting interface identifier has local
1422 * scope according to RFC2373.
1423 */
1424 if (dev->dev_id) {
1425 eui[3] = (dev->dev_id >> 8) & 0xFF;
1426 eui[4] = dev->dev_id & 0xFF;
1427 } else {
1428 eui[3] = 0xFF;
1429 eui[4] = 0xFE;
1430 eui[0] ^= 2;
1431 }
1432 return 0;
1433 }
1434
1435 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1436 {
1437 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1438 if (dev->addr_len != ARCNET_ALEN)
1439 return -1;
1440 memset(eui, 0, 7);
1441 eui[7] = *(u8*)dev->dev_addr;
1442 return 0;
1443 }
1444
1445 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1446 {
1447 if (dev->addr_len != INFINIBAND_ALEN)
1448 return -1;
1449 memcpy(eui, dev->dev_addr + 12, 8);
1450 eui[0] |= 2;
1451 return 0;
1452 }
1453
1454 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1455 {
1456 switch (dev->type) {
1457 case ARPHRD_ETHER:
1458 case ARPHRD_FDDI:
1459 case ARPHRD_IEEE802_TR:
1460 return addrconf_ifid_eui48(eui, dev);
1461 case ARPHRD_ARCNET:
1462 return addrconf_ifid_arcnet(eui, dev);
1463 case ARPHRD_INFINIBAND:
1464 return addrconf_ifid_infiniband(eui, dev);
1465 }
1466 return -1;
1467 }
1468
1469 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1470 {
1471 int err = -1;
1472 struct inet6_ifaddr *ifp;
1473
1474 read_lock_bh(&idev->lock);
1475 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1476 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1477 memcpy(eui, ifp->addr.s6_addr+8, 8);
1478 err = 0;
1479 break;
1480 }
1481 }
1482 read_unlock_bh(&idev->lock);
1483 return err;
1484 }
1485
1486 #ifdef CONFIG_IPV6_PRIVACY
1487 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1488 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1489 {
1490 regen:
1491 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1492 idev->rndid[0] &= ~0x02;
1493
1494 /*
1495 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1496 * check if generated address is not inappropriate
1497 *
1498 * - Reserved subnet anycast (RFC 2526)
1499 * 11111101 11....11 1xxxxxxx
1500 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1501 * 00-00-5E-FE-xx-xx-xx-xx
1502 * - value 0
1503 * - XXX: already assigned to an address on the device
1504 */
1505 if (idev->rndid[0] == 0xfd &&
1506 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1507 (idev->rndid[7]&0x80))
1508 goto regen;
1509 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1510 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1511 goto regen;
1512 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1513 goto regen;
1514 }
1515
1516 return 0;
1517 }
1518
1519 static void ipv6_regen_rndid(unsigned long data)
1520 {
1521 struct inet6_dev *idev = (struct inet6_dev *) data;
1522 unsigned long expires;
1523
1524 rcu_read_lock_bh();
1525 write_lock_bh(&idev->lock);
1526
1527 if (idev->dead)
1528 goto out;
1529
1530 if (__ipv6_regen_rndid(idev) < 0)
1531 goto out;
1532
1533 expires = jiffies +
1534 idev->cnf.temp_prefered_lft * HZ -
1535 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1536 if (time_before(expires, jiffies)) {
1537 printk(KERN_WARNING
1538 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1539 idev->dev->name);
1540 goto out;
1541 }
1542
1543 if (!mod_timer(&idev->regen_timer, expires))
1544 in6_dev_hold(idev);
1545
1546 out:
1547 write_unlock_bh(&idev->lock);
1548 rcu_read_unlock_bh();
1549 in6_dev_put(idev);
1550 }
1551
1552 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1553 int ret = 0;
1554
1555 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1556 ret = __ipv6_regen_rndid(idev);
1557 return ret;
1558 }
1559 #endif
1560
1561 /*
1562 * Add prefix route.
1563 */
1564
1565 static void
1566 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1567 unsigned long expires, u32 flags)
1568 {
1569 struct fib6_config cfg = {
1570 .fc_table = RT6_TABLE_PREFIX,
1571 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1572 .fc_ifindex = dev->ifindex,
1573 .fc_expires = expires,
1574 .fc_dst_len = plen,
1575 .fc_flags = RTF_UP | flags,
1576 .fc_protocol = RTPROT_KERNEL,
1577 };
1578
1579 ipv6_addr_copy(&cfg.fc_dst, pfx);
1580
1581 /* Prevent useless cloning on PtP SIT.
1582 This thing is done here expecting that the whole
1583 class of non-broadcast devices need not cloning.
1584 */
1585 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1586 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1587 cfg.fc_flags |= RTF_NONEXTHOP;
1588 #endif
1589
1590 ip6_route_add(&cfg);
1591 }
1592
1593 /* Create "default" multicast route to the interface */
1594
1595 static void addrconf_add_mroute(struct net_device *dev)
1596 {
1597 struct fib6_config cfg = {
1598 .fc_table = RT6_TABLE_LOCAL,
1599 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1600 .fc_ifindex = dev->ifindex,
1601 .fc_dst_len = 8,
1602 .fc_flags = RTF_UP,
1603 };
1604
1605 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1606
1607 ip6_route_add(&cfg);
1608 }
1609
1610 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1611 static void sit_route_add(struct net_device *dev)
1612 {
1613 struct fib6_config cfg = {
1614 .fc_table = RT6_TABLE_MAIN,
1615 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1616 .fc_ifindex = dev->ifindex,
1617 .fc_dst_len = 96,
1618 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1619 };
1620
1621 /* prefix length - 96 bits "::d.d.d.d" */
1622 ip6_route_add(&cfg);
1623 }
1624 #endif
1625
1626 static void addrconf_add_lroute(struct net_device *dev)
1627 {
1628 struct in6_addr addr;
1629
1630 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1631 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1632 }
1633
1634 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1635 {
1636 struct inet6_dev *idev;
1637
1638 ASSERT_RTNL();
1639
1640 idev = ipv6_find_idev(dev);
1641 if (!idev)
1642 return ERR_PTR(-ENOBUFS);
1643
1644 if (idev->cnf.disable_ipv6)
1645 return ERR_PTR(-EACCES);
1646
1647 /* Add default multicast route */
1648 addrconf_add_mroute(dev);
1649
1650 /* Add link local route */
1651 addrconf_add_lroute(dev);
1652 return idev;
1653 }
1654
1655 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1656 {
1657 struct prefix_info *pinfo;
1658 __u32 valid_lft;
1659 __u32 prefered_lft;
1660 int addr_type;
1661 unsigned long rt_expires;
1662 struct inet6_dev *in6_dev;
1663
1664 pinfo = (struct prefix_info *) opt;
1665
1666 if (len < sizeof(struct prefix_info)) {
1667 ADBG(("addrconf: prefix option too short\n"));
1668 return;
1669 }
1670
1671 /*
1672 * Validation checks ([ADDRCONF], page 19)
1673 */
1674
1675 addr_type = ipv6_addr_type(&pinfo->prefix);
1676
1677 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1678 return;
1679
1680 valid_lft = ntohl(pinfo->valid);
1681 prefered_lft = ntohl(pinfo->prefered);
1682
1683 if (prefered_lft > valid_lft) {
1684 if (net_ratelimit())
1685 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1686 return;
1687 }
1688
1689 in6_dev = in6_dev_get(dev);
1690
1691 if (in6_dev == NULL) {
1692 if (net_ratelimit())
1693 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1694 return;
1695 }
1696
1697 /*
1698 * Two things going on here:
1699 * 1) Add routes for on-link prefixes
1700 * 2) Configure prefixes with the auto flag set
1701 */
1702
1703 if (valid_lft == INFINITY_LIFE_TIME)
1704 rt_expires = ~0UL;
1705 else if (valid_lft >= 0x7FFFFFFF/HZ) {
1706 /* Avoid arithmetic overflow. Really, we could
1707 * save rt_expires in seconds, likely valid_lft,
1708 * but it would require division in fib gc, that it
1709 * not good.
1710 */
1711 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1712 } else
1713 rt_expires = valid_lft * HZ;
1714
1715 /*
1716 * We convert this (in jiffies) to clock_t later.
1717 * Avoid arithmetic overflow there as well.
1718 * Overflow can happen only if HZ < USER_HZ.
1719 */
1720 if (HZ < USER_HZ && ~rt_expires && rt_expires > 0x7FFFFFFF / USER_HZ)
1721 rt_expires = 0x7FFFFFFF / USER_HZ;
1722
1723 if (pinfo->onlink) {
1724 struct rt6_info *rt;
1725 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1726
1727 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1728 /* Autoconf prefix route */
1729 if (valid_lft == 0) {
1730 ip6_del_rt(rt);
1731 rt = NULL;
1732 } else if (~rt_expires) {
1733 /* not infinity */
1734 rt->rt6i_expires = jiffies + rt_expires;
1735 rt->rt6i_flags |= RTF_EXPIRES;
1736 } else {
1737 rt->rt6i_flags &= ~RTF_EXPIRES;
1738 rt->rt6i_expires = 0;
1739 }
1740 } else if (valid_lft) {
1741 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1742 clock_t expires = 0;
1743 if (~rt_expires) {
1744 /* not infinity */
1745 flags |= RTF_EXPIRES;
1746 expires = jiffies_to_clock_t(rt_expires);
1747 }
1748 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1749 dev, expires, flags);
1750 }
1751 if (rt)
1752 dst_release(&rt->u.dst);
1753 }
1754
1755 /* Try to figure out our local address for this prefix */
1756
1757 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1758 struct inet6_ifaddr * ifp;
1759 struct in6_addr addr;
1760 int create = 0, update_lft = 0;
1761
1762 if (pinfo->prefix_len == 64) {
1763 memcpy(&addr, &pinfo->prefix, 8);
1764 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1765 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1766 in6_dev_put(in6_dev);
1767 return;
1768 }
1769 goto ok;
1770 }
1771 if (net_ratelimit())
1772 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1773 pinfo->prefix_len);
1774 in6_dev_put(in6_dev);
1775 return;
1776
1777 ok:
1778
1779 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1780
1781 if (ifp == NULL && valid_lft) {
1782 int max_addresses = in6_dev->cnf.max_addresses;
1783 u32 addr_flags = 0;
1784
1785 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1786 if (in6_dev->cnf.optimistic_dad &&
1787 !ipv6_devconf.forwarding)
1788 addr_flags = IFA_F_OPTIMISTIC;
1789 #endif
1790
1791 /* Do not allow to create too much of autoconfigured
1792 * addresses; this would be too easy way to crash kernel.
1793 */
1794 if (!max_addresses ||
1795 ipv6_count_addresses(in6_dev) < max_addresses)
1796 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1797 addr_type&IPV6_ADDR_SCOPE_MASK,
1798 addr_flags);
1799
1800 if (!ifp || IS_ERR(ifp)) {
1801 in6_dev_put(in6_dev);
1802 return;
1803 }
1804
1805 update_lft = create = 1;
1806 ifp->cstamp = jiffies;
1807 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1808 }
1809
1810 if (ifp) {
1811 int flags;
1812 unsigned long now;
1813 #ifdef CONFIG_IPV6_PRIVACY
1814 struct inet6_ifaddr *ift;
1815 #endif
1816 u32 stored_lft;
1817
1818 /* update lifetime (RFC2462 5.5.3 e) */
1819 spin_lock(&ifp->lock);
1820 now = jiffies;
1821 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1822 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1823 else
1824 stored_lft = 0;
1825 if (!update_lft && stored_lft) {
1826 if (valid_lft > MIN_VALID_LIFETIME ||
1827 valid_lft > stored_lft)
1828 update_lft = 1;
1829 else if (stored_lft <= MIN_VALID_LIFETIME) {
1830 /* valid_lft <= stored_lft is always true */
1831 /*
1832 * RFC 4862 Section 5.5.3e:
1833 * "Note that the preferred lifetime of
1834 * the corresponding address is always
1835 * reset to the Preferred Lifetime in
1836 * the received Prefix Information
1837 * option, regardless of whether the
1838 * valid lifetime is also reset or
1839 * ignored."
1840 *
1841 * So if the preferred lifetime in
1842 * this advertisement is different
1843 * than what we have stored, but the
1844 * valid lifetime is invalid, just
1845 * reset prefered_lft.
1846 *
1847 * We must set the valid lifetime
1848 * to the stored lifetime since we'll
1849 * be updating the timestamp below,
1850 * else we'll set it back to the
1851 * minumum.
1852 */
1853 if (prefered_lft != ifp->prefered_lft) {
1854 valid_lft = stored_lft;
1855 update_lft = 1;
1856 }
1857 } else {
1858 valid_lft = MIN_VALID_LIFETIME;
1859 if (valid_lft < prefered_lft)
1860 prefered_lft = valid_lft;
1861 update_lft = 1;
1862 }
1863 }
1864
1865 if (update_lft) {
1866 ifp->valid_lft = valid_lft;
1867 ifp->prefered_lft = prefered_lft;
1868 ifp->tstamp = now;
1869 flags = ifp->flags;
1870 ifp->flags &= ~IFA_F_DEPRECATED;
1871 spin_unlock(&ifp->lock);
1872
1873 if (!(flags&IFA_F_TENTATIVE))
1874 ipv6_ifa_notify(0, ifp);
1875 } else
1876 spin_unlock(&ifp->lock);
1877
1878 #ifdef CONFIG_IPV6_PRIVACY
1879 read_lock_bh(&in6_dev->lock);
1880 /* update all temporary addresses in the list */
1881 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1882 /*
1883 * When adjusting the lifetimes of an existing
1884 * temporary address, only lower the lifetimes.
1885 * Implementations must not increase the
1886 * lifetimes of an existing temporary address
1887 * when processing a Prefix Information Option.
1888 */
1889 if (ifp != ift->ifpub)
1890 continue;
1891
1892 spin_lock(&ift->lock);
1893 flags = ift->flags;
1894 if (ift->valid_lft > valid_lft &&
1895 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1896 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1897 if (ift->prefered_lft > prefered_lft &&
1898 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1899 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1900 spin_unlock(&ift->lock);
1901 if (!(flags&IFA_F_TENTATIVE))
1902 ipv6_ifa_notify(0, ift);
1903 }
1904
1905 if (create && in6_dev->cnf.use_tempaddr > 0) {
1906 /*
1907 * When a new public address is created as described in [ADDRCONF],
1908 * also create a new temporary address.
1909 */
1910 read_unlock_bh(&in6_dev->lock);
1911 ipv6_create_tempaddr(ifp, NULL);
1912 } else {
1913 read_unlock_bh(&in6_dev->lock);
1914 }
1915 #endif
1916 in6_ifa_put(ifp);
1917 addrconf_verify(0);
1918 }
1919 }
1920 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1921 in6_dev_put(in6_dev);
1922 }
1923
1924 /*
1925 * Set destination address.
1926 * Special case for SIT interfaces where we create a new "virtual"
1927 * device.
1928 */
1929 int addrconf_set_dstaddr(void __user *arg)
1930 {
1931 struct in6_ifreq ireq;
1932 struct net_device *dev;
1933 int err = -EINVAL;
1934
1935 rtnl_lock();
1936
1937 err = -EFAULT;
1938 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1939 goto err_exit;
1940
1941 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1942
1943 err = -ENODEV;
1944 if (dev == NULL)
1945 goto err_exit;
1946
1947 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1948 if (dev->type == ARPHRD_SIT) {
1949 struct ifreq ifr;
1950 mm_segment_t oldfs;
1951 struct ip_tunnel_parm p;
1952
1953 err = -EADDRNOTAVAIL;
1954 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1955 goto err_exit;
1956
1957 memset(&p, 0, sizeof(p));
1958 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1959 p.iph.saddr = 0;
1960 p.iph.version = 4;
1961 p.iph.ihl = 5;
1962 p.iph.protocol = IPPROTO_IPV6;
1963 p.iph.ttl = 64;
1964 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1965
1966 oldfs = get_fs(); set_fs(KERNEL_DS);
1967 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1968 set_fs(oldfs);
1969
1970 if (err == 0) {
1971 err = -ENOBUFS;
1972 if ((dev = __dev_get_by_name(p.name)) == NULL)
1973 goto err_exit;
1974 err = dev_open(dev);
1975 }
1976 }
1977 #endif
1978
1979 err_exit:
1980 rtnl_unlock();
1981 return err;
1982 }
1983
1984 /*
1985 * Manual configuration of address on an interface
1986 */
1987 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1988 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1989 {
1990 struct inet6_ifaddr *ifp;
1991 struct inet6_dev *idev;
1992 struct net_device *dev;
1993 int scope;
1994 u32 flags;
1995 clock_t expires;
1996
1997 ASSERT_RTNL();
1998
1999 /* check the lifetime */
2000 if (!valid_lft || prefered_lft > valid_lft)
2001 return -EINVAL;
2002
2003 if ((dev = __dev_get_by_index(ifindex)) == NULL)
2004 return -ENODEV;
2005
2006 idev = addrconf_add_dev(dev);
2007 if (IS_ERR(idev))
2008 return PTR_ERR(idev);
2009
2010 scope = ipv6_addr_scope(pfx);
2011
2012 if (valid_lft == INFINITY_LIFE_TIME) {
2013 ifa_flags |= IFA_F_PERMANENT;
2014 flags = 0;
2015 expires = 0;
2016 } else {
2017 if (valid_lft >= 0x7FFFFFFF/HZ)
2018 valid_lft = 0x7FFFFFFF/HZ;
2019 flags = RTF_EXPIRES;
2020 expires = jiffies_to_clock_t(valid_lft * HZ);
2021 }
2022
2023 if (prefered_lft == 0)
2024 ifa_flags |= IFA_F_DEPRECATED;
2025 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2026 (prefered_lft != INFINITY_LIFE_TIME))
2027 prefered_lft = 0x7FFFFFFF/HZ;
2028
2029 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2030
2031 if (!IS_ERR(ifp)) {
2032 spin_lock_bh(&ifp->lock);
2033 ifp->valid_lft = valid_lft;
2034 ifp->prefered_lft = prefered_lft;
2035 ifp->tstamp = jiffies;
2036 spin_unlock_bh(&ifp->lock);
2037
2038 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2039 expires, flags);
2040 /*
2041 * Note that section 3.1 of RFC 4429 indicates
2042 * that the Optimistic flag should not be set for
2043 * manually configured addresses
2044 */
2045 addrconf_dad_start(ifp, 0);
2046 in6_ifa_put(ifp);
2047 addrconf_verify(0);
2048 return 0;
2049 }
2050
2051 return PTR_ERR(ifp);
2052 }
2053
2054 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
2055 {
2056 struct inet6_ifaddr *ifp;
2057 struct inet6_dev *idev;
2058 struct net_device *dev;
2059
2060 if ((dev = __dev_get_by_index(ifindex)) == NULL)
2061 return -ENODEV;
2062
2063 if ((idev = __in6_dev_get(dev)) == NULL)
2064 return -ENXIO;
2065
2066 read_lock_bh(&idev->lock);
2067 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2068 if (ifp->prefix_len == plen &&
2069 ipv6_addr_equal(pfx, &ifp->addr)) {
2070 in6_ifa_hold(ifp);
2071 read_unlock_bh(&idev->lock);
2072
2073 ipv6_del_addr(ifp);
2074
2075 /* If the last address is deleted administratively,
2076 disable IPv6 on this interface.
2077 */
2078 if (idev->addr_list == NULL)
2079 addrconf_ifdown(idev->dev, 1);
2080 return 0;
2081 }
2082 }
2083 read_unlock_bh(&idev->lock);
2084 return -EADDRNOTAVAIL;
2085 }
2086
2087
2088 int addrconf_add_ifaddr(void __user *arg)
2089 {
2090 struct in6_ifreq ireq;
2091 int err;
2092
2093 if (!capable(CAP_NET_ADMIN))
2094 return -EPERM;
2095
2096 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2097 return -EFAULT;
2098
2099 rtnl_lock();
2100 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2101 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2102 rtnl_unlock();
2103 return err;
2104 }
2105
2106 int addrconf_del_ifaddr(void __user *arg)
2107 {
2108 struct in6_ifreq ireq;
2109 int err;
2110
2111 if (!capable(CAP_NET_ADMIN))
2112 return -EPERM;
2113
2114 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2115 return -EFAULT;
2116
2117 rtnl_lock();
2118 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2119 rtnl_unlock();
2120 return err;
2121 }
2122
2123 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2124 static void sit_add_v4_addrs(struct inet6_dev *idev)
2125 {
2126 struct inet6_ifaddr * ifp;
2127 struct in6_addr addr;
2128 struct net_device *dev;
2129 int scope;
2130
2131 ASSERT_RTNL();
2132
2133 memset(&addr, 0, sizeof(struct in6_addr));
2134 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2135
2136 if (idev->dev->flags&IFF_POINTOPOINT) {
2137 addr.s6_addr32[0] = htonl(0xfe800000);
2138 scope = IFA_LINK;
2139 } else {
2140 scope = IPV6_ADDR_COMPATv4;
2141 }
2142
2143 if (addr.s6_addr32[3]) {
2144 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2145 if (!IS_ERR(ifp)) {
2146 spin_lock_bh(&ifp->lock);
2147 ifp->flags &= ~IFA_F_TENTATIVE;
2148 spin_unlock_bh(&ifp->lock);
2149 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2150 in6_ifa_put(ifp);
2151 }
2152 return;
2153 }
2154
2155 for_each_netdev(dev) {
2156 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2157 if (in_dev && (dev->flags & IFF_UP)) {
2158 struct in_ifaddr * ifa;
2159
2160 int flag = scope;
2161
2162 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2163 int plen;
2164
2165 addr.s6_addr32[3] = ifa->ifa_local;
2166
2167 if (ifa->ifa_scope == RT_SCOPE_LINK)
2168 continue;
2169 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2170 if (idev->dev->flags&IFF_POINTOPOINT)
2171 continue;
2172 flag |= IFA_HOST;
2173 }
2174 if (idev->dev->flags&IFF_POINTOPOINT)
2175 plen = 64;
2176 else
2177 plen = 96;
2178
2179 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2180 IFA_F_PERMANENT);
2181 if (!IS_ERR(ifp)) {
2182 spin_lock_bh(&ifp->lock);
2183 ifp->flags &= ~IFA_F_TENTATIVE;
2184 spin_unlock_bh(&ifp->lock);
2185 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2186 in6_ifa_put(ifp);
2187 }
2188 }
2189 }
2190 }
2191 }
2192 #endif
2193
2194 static void init_loopback(struct net_device *dev)
2195 {
2196 struct inet6_dev *idev;
2197 struct inet6_ifaddr * ifp;
2198
2199 /* ::1 */
2200
2201 ASSERT_RTNL();
2202
2203 if ((idev = ipv6_find_idev(dev)) == NULL) {
2204 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2205 return;
2206 }
2207
2208 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2209 if (!IS_ERR(ifp)) {
2210 spin_lock_bh(&ifp->lock);
2211 ifp->flags &= ~IFA_F_TENTATIVE;
2212 spin_unlock_bh(&ifp->lock);
2213 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2214 in6_ifa_put(ifp);
2215 }
2216 }
2217
2218 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2219 {
2220 struct inet6_ifaddr * ifp;
2221 u32 addr_flags = IFA_F_PERMANENT;
2222
2223 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2224 if (idev->cnf.optimistic_dad &&
2225 !ipv6_devconf.forwarding)
2226 addr_flags |= IFA_F_OPTIMISTIC;
2227 #endif
2228
2229
2230 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2231 if (!IS_ERR(ifp)) {
2232 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2233 addrconf_dad_start(ifp, 0);
2234 in6_ifa_put(ifp);
2235 }
2236 }
2237
2238 static void addrconf_dev_config(struct net_device *dev)
2239 {
2240 struct in6_addr addr;
2241 struct inet6_dev * idev;
2242
2243 ASSERT_RTNL();
2244
2245 if ((dev->type != ARPHRD_ETHER) &&
2246 (dev->type != ARPHRD_FDDI) &&
2247 (dev->type != ARPHRD_IEEE802_TR) &&
2248 (dev->type != ARPHRD_ARCNET) &&
2249 (dev->type != ARPHRD_INFINIBAND)) {
2250 /* Alas, we support only Ethernet autoconfiguration. */
2251 return;
2252 }
2253
2254 idev = addrconf_add_dev(dev);
2255 if (IS_ERR(idev))
2256 return;
2257
2258 memset(&addr, 0, sizeof(struct in6_addr));
2259 addr.s6_addr32[0] = htonl(0xFE800000);
2260
2261 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2262 addrconf_add_linklocal(idev, &addr);
2263 }
2264
2265 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2266 static void addrconf_sit_config(struct net_device *dev)
2267 {
2268 struct inet6_dev *idev;
2269
2270 ASSERT_RTNL();
2271
2272 /*
2273 * Configure the tunnel with one of our IPv4
2274 * addresses... we should configure all of
2275 * our v4 addrs in the tunnel
2276 */
2277
2278 if ((idev = ipv6_find_idev(dev)) == NULL) {
2279 printk(KERN_DEBUG "init sit: add_dev failed\n");
2280 return;
2281 }
2282
2283 sit_add_v4_addrs(idev);
2284
2285 if (dev->flags&IFF_POINTOPOINT) {
2286 addrconf_add_mroute(dev);
2287 addrconf_add_lroute(dev);
2288 } else
2289 sit_route_add(dev);
2290 }
2291 #endif
2292
2293 static inline int
2294 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2295 {
2296 struct in6_addr lladdr;
2297
2298 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2299 addrconf_add_linklocal(idev, &lladdr);
2300 return 0;
2301 }
2302 return -1;
2303 }
2304
2305 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2306 {
2307 struct net_device *link_dev;
2308
2309 /* first try to inherit the link-local address from the link device */
2310 if (idev->dev->iflink &&
2311 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2312 if (!ipv6_inherit_linklocal(idev, link_dev))
2313 return;
2314 }
2315 /* then try to inherit it from any device */
2316 for_each_netdev(link_dev) {
2317 if (!ipv6_inherit_linklocal(idev, link_dev))
2318 return;
2319 }
2320 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2321 }
2322
2323 /*
2324 * Autoconfigure tunnel with a link-local address so routing protocols,
2325 * DHCPv6, MLD etc. can be run over the virtual link
2326 */
2327
2328 static void addrconf_ip6_tnl_config(struct net_device *dev)
2329 {
2330 struct inet6_dev *idev;
2331
2332 ASSERT_RTNL();
2333
2334 idev = addrconf_add_dev(dev);
2335 if (IS_ERR(idev)) {
2336 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2337 return;
2338 }
2339 ip6_tnl_add_linklocal(idev);
2340 }
2341
2342 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2343 void * data)
2344 {
2345 struct net_device *dev = (struct net_device *) data;
2346 struct inet6_dev *idev = __in6_dev_get(dev);
2347 int run_pending = 0;
2348
2349 switch(event) {
2350 case NETDEV_REGISTER:
2351 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2352 idev = ipv6_add_dev(dev);
2353 if (!idev)
2354 printk(KERN_WARNING "IPv6: add_dev failed for %s\n",
2355 dev->name);
2356 }
2357 break;
2358 case NETDEV_UP:
2359 case NETDEV_CHANGE:
2360 if (dev->flags & IFF_SLAVE)
2361 break;
2362
2363 if (event == NETDEV_UP) {
2364 if (!addrconf_qdisc_ok(dev)) {
2365 /* device is not ready yet. */
2366 printk(KERN_INFO
2367 "ADDRCONF(NETDEV_UP): %s: "
2368 "link is not ready\n",
2369 dev->name);
2370 break;
2371 }
2372
2373 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2374 idev = ipv6_add_dev(dev);
2375
2376 if (idev)
2377 idev->if_flags |= IF_READY;
2378 } else {
2379 if (!addrconf_qdisc_ok(dev)) {
2380 /* device is still not ready. */
2381 break;
2382 }
2383
2384 if (idev) {
2385 if (idev->if_flags & IF_READY) {
2386 /* device is already configured. */
2387 break;
2388 }
2389 idev->if_flags |= IF_READY;
2390 }
2391
2392 printk(KERN_INFO
2393 "ADDRCONF(NETDEV_CHANGE): %s: "
2394 "link becomes ready\n",
2395 dev->name);
2396
2397 run_pending = 1;
2398 }
2399
2400 switch(dev->type) {
2401 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2402 case ARPHRD_SIT:
2403 addrconf_sit_config(dev);
2404 break;
2405 #endif
2406 case ARPHRD_TUNNEL6:
2407 addrconf_ip6_tnl_config(dev);
2408 break;
2409 case ARPHRD_LOOPBACK:
2410 init_loopback(dev);
2411 break;
2412
2413 default:
2414 addrconf_dev_config(dev);
2415 break;
2416 }
2417 if (idev) {
2418 if (run_pending)
2419 addrconf_dad_run(idev);
2420
2421 /* If the MTU changed during the interface down, when the
2422 interface up, the changed MTU must be reflected in the
2423 idev as well as routers.
2424 */
2425 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2426 rt6_mtu_change(dev, dev->mtu);
2427 idev->cnf.mtu6 = dev->mtu;
2428 }
2429 idev->tstamp = jiffies;
2430 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2431 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2432 stop IPv6 on this interface.
2433 */
2434 if (dev->mtu < IPV6_MIN_MTU)
2435 addrconf_ifdown(dev, event != NETDEV_DOWN);
2436 }
2437 break;
2438
2439 case NETDEV_CHANGEMTU:
2440 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2441 rt6_mtu_change(dev, dev->mtu);
2442 idev->cnf.mtu6 = dev->mtu;
2443 break;
2444 }
2445
2446 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2447 idev = ipv6_add_dev(dev);
2448 if (idev)
2449 break;
2450 }
2451
2452 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2453
2454 case NETDEV_DOWN:
2455 case NETDEV_UNREGISTER:
2456 /*
2457 * Remove all addresses from this interface.
2458 */
2459 addrconf_ifdown(dev, event != NETDEV_DOWN);
2460 break;
2461
2462 case NETDEV_CHANGENAME:
2463 if (idev) {
2464 snmp6_unregister_dev(idev);
2465 #ifdef CONFIG_SYSCTL
2466 addrconf_sysctl_unregister(&idev->cnf);
2467 neigh_sysctl_unregister(idev->nd_parms);
2468 neigh_sysctl_register(dev, idev->nd_parms,
2469 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2470 &ndisc_ifinfo_sysctl_change,
2471 NULL);
2472 addrconf_sysctl_register(idev, &idev->cnf);
2473 #endif
2474 snmp6_register_dev(idev);
2475 }
2476 break;
2477 }
2478
2479 return NOTIFY_OK;
2480 }
2481
2482 /*
2483 * addrconf module should be notified of a device going up
2484 */
2485 static struct notifier_block ipv6_dev_notf = {
2486 .notifier_call = addrconf_notify,
2487 .priority = 0
2488 };
2489
2490 static int addrconf_ifdown(struct net_device *dev, int how)
2491 {
2492 struct inet6_dev *idev;
2493 struct inet6_ifaddr *ifa, **bifa;
2494 int i;
2495
2496 ASSERT_RTNL();
2497
2498 if (dev == &loopback_dev && how == 1)
2499 how = 0;
2500
2501 rt6_ifdown(dev);
2502 neigh_ifdown(&nd_tbl, dev);
2503
2504 idev = __in6_dev_get(dev);
2505 if (idev == NULL)
2506 return -ENODEV;
2507
2508 /* Step 1: remove reference to ipv6 device from parent device.
2509 Do not dev_put!
2510 */
2511 if (how == 1) {
2512 idev->dead = 1;
2513
2514 /* protected by rtnl_lock */
2515 rcu_assign_pointer(dev->ip6_ptr, NULL);
2516
2517 /* Step 1.5: remove snmp6 entry */
2518 snmp6_unregister_dev(idev);
2519
2520 }
2521
2522 /* Step 2: clear hash table */
2523 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2524 bifa = &inet6_addr_lst[i];
2525
2526 write_lock_bh(&addrconf_hash_lock);
2527 while ((ifa = *bifa) != NULL) {
2528 if (ifa->idev == idev) {
2529 *bifa = ifa->lst_next;
2530 ifa->lst_next = NULL;
2531 addrconf_del_timer(ifa);
2532 in6_ifa_put(ifa);
2533 continue;
2534 }
2535 bifa = &ifa->lst_next;
2536 }
2537 write_unlock_bh(&addrconf_hash_lock);
2538 }
2539
2540 write_lock_bh(&idev->lock);
2541
2542 /* Step 3: clear flags for stateless addrconf */
2543 if (how != 1)
2544 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2545
2546 /* Step 4: clear address list */
2547 #ifdef CONFIG_IPV6_PRIVACY
2548 if (how == 1 && del_timer(&idev->regen_timer))
2549 in6_dev_put(idev);
2550
2551 /* clear tempaddr list */
2552 while ((ifa = idev->tempaddr_list) != NULL) {
2553 idev->tempaddr_list = ifa->tmp_next;
2554 ifa->tmp_next = NULL;
2555 ifa->dead = 1;
2556 write_unlock_bh(&idev->lock);
2557 spin_lock_bh(&ifa->lock);
2558
2559 if (ifa->ifpub) {
2560 in6_ifa_put(ifa->ifpub);
2561 ifa->ifpub = NULL;
2562 }
2563 spin_unlock_bh(&ifa->lock);
2564 in6_ifa_put(ifa);
2565 write_lock_bh(&idev->lock);
2566 }
2567 #endif
2568 while ((ifa = idev->addr_list) != NULL) {
2569 idev->addr_list = ifa->if_next;
2570 ifa->if_next = NULL;
2571 ifa->dead = 1;
2572 addrconf_del_timer(ifa);
2573 write_unlock_bh(&idev->lock);
2574
2575 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2576 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2577 in6_ifa_put(ifa);
2578
2579 write_lock_bh(&idev->lock);
2580 }
2581 write_unlock_bh(&idev->lock);
2582
2583 /* Step 5: Discard multicast list */
2584
2585 if (how == 1)
2586 ipv6_mc_destroy_dev(idev);
2587 else
2588 ipv6_mc_down(idev);
2589
2590 /* Step 5: netlink notification of this interface */
2591 idev->tstamp = jiffies;
2592 inet6_ifinfo_notify(RTM_DELLINK, idev);
2593
2594 /* Shot the device (if unregistered) */
2595
2596 if (how == 1) {
2597 #ifdef CONFIG_SYSCTL
2598 addrconf_sysctl_unregister(&idev->cnf);
2599 neigh_sysctl_unregister(idev->nd_parms);
2600 #endif
2601 neigh_parms_release(&nd_tbl, idev->nd_parms);
2602 neigh_ifdown(&nd_tbl, dev);
2603 in6_dev_put(idev);
2604 }
2605 return 0;
2606 }
2607
2608 static void addrconf_rs_timer(unsigned long data)
2609 {
2610 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2611 struct inet6_dev *idev = ifp->idev;
2612
2613 read_lock(&idev->lock);
2614 if (idev->dead || !(idev->if_flags & IF_READY))
2615 goto out;
2616
2617 if (idev->cnf.forwarding)
2618 goto out;
2619
2620 /* Announcement received after solicitation was sent */
2621 if (idev->if_flags & IF_RA_RCVD)
2622 goto out;
2623
2624 spin_lock(&ifp->lock);
2625 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2626 struct in6_addr all_routers;
2627
2628 /* The wait after the last probe can be shorter */
2629 addrconf_mod_timer(ifp, AC_RS,
2630 (ifp->probes == idev->cnf.rtr_solicits) ?
2631 idev->cnf.rtr_solicit_delay :
2632 idev->cnf.rtr_solicit_interval);
2633 spin_unlock(&ifp->lock);
2634
2635 ipv6_addr_all_routers(&all_routers);
2636
2637 ndisc_send_rs(idev->dev, &ifp->addr, &all_routers);
2638 } else {
2639 spin_unlock(&ifp->lock);
2640 /*
2641 * Note: we do not support deprecated "all on-link"
2642 * assumption any longer.
2643 */
2644 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2645 idev->dev->name);
2646 }
2647
2648 out:
2649 read_unlock(&idev->lock);
2650 in6_ifa_put(ifp);
2651 }
2652
2653 /*
2654 * Duplicate Address Detection
2655 */
2656 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2657 {
2658 unsigned long rand_num;
2659 struct inet6_dev *idev = ifp->idev;
2660
2661 if (ifp->flags & IFA_F_OPTIMISTIC)
2662 rand_num = 0;
2663 else
2664 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2665
2666 ifp->probes = idev->cnf.dad_transmits;
2667 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2668 }
2669
2670 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2671 {
2672 struct inet6_dev *idev = ifp->idev;
2673 struct net_device *dev = idev->dev;
2674
2675 addrconf_join_solict(dev, &ifp->addr);
2676
2677 net_srandom(ifp->addr.s6_addr32[3]);
2678
2679 read_lock_bh(&idev->lock);
2680 if (ifp->dead)
2681 goto out;
2682 spin_lock_bh(&ifp->lock);
2683
2684 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2685 !(ifp->flags&IFA_F_TENTATIVE) ||
2686 ifp->flags & IFA_F_NODAD) {
2687 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2688 spin_unlock_bh(&ifp->lock);
2689 read_unlock_bh(&idev->lock);
2690
2691 addrconf_dad_completed(ifp);
2692 return;
2693 }
2694
2695 if (!(idev->if_flags & IF_READY)) {
2696 spin_unlock_bh(&ifp->lock);
2697 read_unlock_bh(&idev->lock);
2698 /*
2699 * If the defice is not ready:
2700 * - keep it tentative if it is a permanent address.
2701 * - otherwise, kill it.
2702 */
2703 in6_ifa_hold(ifp);
2704 addrconf_dad_stop(ifp, 0);
2705 return;
2706 }
2707
2708 /*
2709 * Optimistic nodes can start receiving
2710 * Frames right away
2711 */
2712 if(ifp->flags & IFA_F_OPTIMISTIC)
2713 ip6_ins_rt(ifp->rt);
2714
2715 addrconf_dad_kick(ifp);
2716 spin_unlock_bh(&ifp->lock);
2717 out:
2718 read_unlock_bh(&idev->lock);
2719 }
2720
2721 static void addrconf_dad_timer(unsigned long data)
2722 {
2723 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2724 struct inet6_dev *idev = ifp->idev;
2725 struct in6_addr unspec;
2726 struct in6_addr mcaddr;
2727
2728 read_lock_bh(&idev->lock);
2729 if (idev->dead) {
2730 read_unlock_bh(&idev->lock);
2731 goto out;
2732 }
2733 spin_lock_bh(&ifp->lock);
2734 if (ifp->probes == 0) {
2735 /*
2736 * DAD was successful
2737 */
2738
2739 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2740 spin_unlock_bh(&ifp->lock);
2741 read_unlock_bh(&idev->lock);
2742
2743 addrconf_dad_completed(ifp);
2744
2745 goto out;
2746 }
2747
2748 ifp->probes--;
2749 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2750 spin_unlock_bh(&ifp->lock);
2751 read_unlock_bh(&idev->lock);
2752
2753 /* send a neighbour solicitation for our addr */
2754 memset(&unspec, 0, sizeof(unspec));
2755 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2756 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2757 out:
2758 in6_ifa_put(ifp);
2759 }
2760
2761 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2762 {
2763 struct net_device * dev = ifp->idev->dev;
2764
2765 /*
2766 * Configure the address for reception. Now it is valid.
2767 */
2768
2769 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2770
2771 /* If added prefix is link local and forwarding is off,
2772 start sending router solicitations.
2773 */
2774
2775 if ((ifp->idev->cnf.forwarding == 0 ||
2776 ifp->idev->cnf.forwarding == 2) &&
2777 ifp->idev->cnf.rtr_solicits > 0 &&
2778 (dev->flags&IFF_LOOPBACK) == 0 &&
2779 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2780 struct in6_addr all_routers;
2781
2782 ipv6_addr_all_routers(&all_routers);
2783
2784 /*
2785 * If a host as already performed a random delay
2786 * [...] as part of DAD [...] there is no need
2787 * to delay again before sending the first RS
2788 */
2789 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2790
2791 spin_lock_bh(&ifp->lock);
2792 ifp->probes = 1;
2793 ifp->idev->if_flags |= IF_RS_SENT;
2794 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2795 spin_unlock_bh(&ifp->lock);
2796 }
2797 }
2798
2799 static void addrconf_dad_run(struct inet6_dev *idev) {
2800 struct inet6_ifaddr *ifp;
2801
2802 read_lock_bh(&idev->lock);
2803 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2804 spin_lock_bh(&ifp->lock);
2805 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2806 spin_unlock_bh(&ifp->lock);
2807 continue;
2808 }
2809 spin_unlock_bh(&ifp->lock);
2810 addrconf_dad_kick(ifp);
2811 }
2812 read_unlock_bh(&idev->lock);
2813 }
2814
2815 #ifdef CONFIG_PROC_FS
2816 struct if6_iter_state {
2817 int bucket;
2818 };
2819
2820 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2821 {
2822 struct inet6_ifaddr *ifa = NULL;
2823 struct if6_iter_state *state = seq->private;
2824
2825 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2826 ifa = inet6_addr_lst[state->bucket];
2827 if (ifa)
2828 break;
2829 }
2830 return ifa;
2831 }
2832
2833 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2834 {
2835 struct if6_iter_state *state = seq->private;
2836
2837 ifa = ifa->lst_next;
2838 try_again:
2839 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2840 ifa = inet6_addr_lst[state->bucket];
2841 goto try_again;
2842 }
2843 return ifa;
2844 }
2845
2846 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2847 {
2848 struct inet6_ifaddr *ifa = if6_get_first(seq);
2849
2850 if (ifa)
2851 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2852 --pos;
2853 return pos ? NULL : ifa;
2854 }
2855
2856 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2857 {
2858 read_lock_bh(&addrconf_hash_lock);
2859 return if6_get_idx(seq, *pos);
2860 }
2861
2862 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2863 {
2864 struct inet6_ifaddr *ifa;
2865
2866 ifa = if6_get_next(seq, v);
2867 ++*pos;
2868 return ifa;
2869 }
2870
2871 static void if6_seq_stop(struct seq_file *seq, void *v)
2872 {
2873 read_unlock_bh(&addrconf_hash_lock);
2874 }
2875
2876 static int if6_seq_show(struct seq_file *seq, void *v)
2877 {
2878 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2879 seq_printf(seq,
2880 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2881 NIP6(ifp->addr),
2882 ifp->idev->dev->ifindex,
2883 ifp->prefix_len,
2884 ifp->scope,
2885 ifp->flags,
2886 ifp->idev->dev->name);
2887 return 0;
2888 }
2889
2890 static struct seq_operations if6_seq_ops = {
2891 .start = if6_seq_start,
2892 .next = if6_seq_next,
2893 .show = if6_seq_show,
2894 .stop = if6_seq_stop,
2895 };
2896
2897 static int if6_seq_open(struct inode *inode, struct file *file)
2898 {
2899 return seq_open_private(file, &if6_seq_ops,
2900 sizeof(struct if6_iter_state));
2901 }
2902
2903 static const struct file_operations if6_fops = {
2904 .owner = THIS_MODULE,
2905 .open = if6_seq_open,
2906 .read = seq_read,
2907 .llseek = seq_lseek,
2908 .release = seq_release_private,
2909 };
2910
2911 int __init if6_proc_init(void)
2912 {
2913 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2914 return -ENOMEM;
2915 return 0;
2916 }
2917
2918 void if6_proc_exit(void)
2919 {
2920 proc_net_remove("if_inet6");
2921 }
2922 #endif /* CONFIG_PROC_FS */
2923
2924 #ifdef CONFIG_IPV6_MIP6
2925 /* Check if address is a home address configured on any interface. */
2926 int ipv6_chk_home_addr(struct in6_addr *addr)
2927 {
2928 int ret = 0;
2929 struct inet6_ifaddr * ifp;
2930 unsigned int hash = ipv6_addr_hash(addr);
2931
2932 read_lock_bh(&addrconf_hash_lock);
2933 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2934 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2935 (ifp->flags & IFA_F_HOMEADDRESS)) {
2936 ret = 1;
2937 break;
2938 }
2939 }
2940 read_unlock_bh(&addrconf_hash_lock);
2941 return ret;
2942 }
2943 #endif
2944
2945 /*
2946 * Periodic address status verification
2947 */
2948
2949 static void addrconf_verify(unsigned long foo)
2950 {
2951 struct inet6_ifaddr *ifp;
2952 unsigned long now, next;
2953 int i;
2954
2955 spin_lock_bh(&addrconf_verify_lock);
2956 now = jiffies;
2957 next = now + ADDR_CHECK_FREQUENCY;
2958
2959 del_timer(&addr_chk_timer);
2960
2961 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2962
2963 restart:
2964 read_lock(&addrconf_hash_lock);
2965 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2966 unsigned long age;
2967 #ifdef CONFIG_IPV6_PRIVACY
2968 unsigned long regen_advance;
2969 #endif
2970
2971 if (ifp->flags & IFA_F_PERMANENT)
2972 continue;
2973
2974 spin_lock(&ifp->lock);
2975 age = (now - ifp->tstamp) / HZ;
2976
2977 #ifdef CONFIG_IPV6_PRIVACY
2978 regen_advance = ifp->idev->cnf.regen_max_retry *
2979 ifp->idev->cnf.dad_transmits *
2980 ifp->idev->nd_parms->retrans_time / HZ;
2981 #endif
2982
2983 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2984 age >= ifp->valid_lft) {
2985 spin_unlock(&ifp->lock);
2986 in6_ifa_hold(ifp);
2987 read_unlock(&addrconf_hash_lock);
2988 ipv6_del_addr(ifp);
2989 goto restart;
2990 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2991 spin_unlock(&ifp->lock);
2992 continue;
2993 } else if (age >= ifp->prefered_lft) {
2994 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2995 int deprecate = 0;
2996
2997 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2998 deprecate = 1;
2999 ifp->flags |= IFA_F_DEPRECATED;
3000 }
3001
3002 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3003 next = ifp->tstamp + ifp->valid_lft * HZ;
3004
3005 spin_unlock(&ifp->lock);
3006
3007 if (deprecate) {
3008 in6_ifa_hold(ifp);
3009 read_unlock(&addrconf_hash_lock);
3010
3011 ipv6_ifa_notify(0, ifp);
3012 in6_ifa_put(ifp);
3013 goto restart;
3014 }
3015 #ifdef CONFIG_IPV6_PRIVACY
3016 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3017 !(ifp->flags&IFA_F_TENTATIVE)) {
3018 if (age >= ifp->prefered_lft - regen_advance) {
3019 struct inet6_ifaddr *ifpub = ifp->ifpub;
3020 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3021 next = ifp->tstamp + ifp->prefered_lft * HZ;
3022 if (!ifp->regen_count && ifpub) {
3023 ifp->regen_count++;
3024 in6_ifa_hold(ifp);
3025 in6_ifa_hold(ifpub);
3026 spin_unlock(&ifp->lock);
3027 read_unlock(&addrconf_hash_lock);
3028 spin_lock(&ifpub->lock);
3029 ifpub->regen_count = 0;
3030 spin_unlock(&ifpub->lock);
3031 ipv6_create_tempaddr(ifpub, ifp);
3032 in6_ifa_put(ifpub);
3033 in6_ifa_put(ifp);
3034 goto restart;
3035 }
3036 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3037 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3038 spin_unlock(&ifp->lock);
3039 #endif
3040 } else {
3041 /* ifp->prefered_lft <= ifp->valid_lft */
3042 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3043 next = ifp->tstamp + ifp->prefered_lft * HZ;
3044 spin_unlock(&ifp->lock);
3045 }
3046 }
3047 read_unlock(&addrconf_hash_lock);
3048 }
3049
3050 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3051 add_timer(&addr_chk_timer);
3052 spin_unlock_bh(&addrconf_verify_lock);
3053 }
3054
3055 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3056 {
3057 struct in6_addr *pfx = NULL;
3058
3059 if (addr)
3060 pfx = nla_data(addr);
3061
3062 if (local) {
3063 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3064 pfx = NULL;
3065 else
3066 pfx = nla_data(local);
3067 }
3068
3069 return pfx;
3070 }
3071
3072 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3073 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3074 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3075 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3076 };
3077
3078 static int
3079 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3080 {
3081 struct ifaddrmsg *ifm;
3082 struct nlattr *tb[IFA_MAX+1];
3083 struct in6_addr *pfx;
3084 int err;
3085
3086 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3087 if (err < 0)
3088 return err;
3089
3090 ifm = nlmsg_data(nlh);
3091 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3092 if (pfx == NULL)
3093 return -EINVAL;
3094
3095 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3096 }
3097
3098 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3099 u32 prefered_lft, u32 valid_lft)
3100 {
3101 u32 flags;
3102 clock_t expires;
3103
3104 if (!valid_lft || (prefered_lft > valid_lft))
3105 return -EINVAL;
3106
3107 if (valid_lft == INFINITY_LIFE_TIME) {
3108 ifa_flags |= IFA_F_PERMANENT;
3109 flags = 0;
3110 expires = 0;
3111 } else {
3112 if (valid_lft >= 0x7FFFFFFF/HZ)
3113 valid_lft = 0x7FFFFFFF/HZ;
3114 flags = RTF_EXPIRES;
3115 expires = jiffies_to_clock_t(valid_lft * HZ);
3116 }
3117
3118 if (prefered_lft == 0)
3119 ifa_flags |= IFA_F_DEPRECATED;
3120 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3121 (prefered_lft != INFINITY_LIFE_TIME))
3122 prefered_lft = 0x7FFFFFFF/HZ;
3123
3124 spin_lock_bh(&ifp->lock);
3125 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3126 ifp->tstamp = jiffies;
3127 ifp->valid_lft = valid_lft;
3128 ifp->prefered_lft = prefered_lft;
3129
3130 spin_unlock_bh(&ifp->lock);
3131 if (!(ifp->flags&IFA_F_TENTATIVE))
3132 ipv6_ifa_notify(0, ifp);
3133
3134 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3135 expires, flags);
3136 addrconf_verify(0);
3137
3138 return 0;
3139 }
3140
3141 static int
3142 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3143 {
3144 struct ifaddrmsg *ifm;
3145 struct nlattr *tb[IFA_MAX+1];
3146 struct in6_addr *pfx;
3147 struct inet6_ifaddr *ifa;
3148 struct net_device *dev;
3149 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3150 u8 ifa_flags;
3151 int err;
3152
3153 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3154 if (err < 0)
3155 return err;
3156
3157 ifm = nlmsg_data(nlh);
3158 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3159 if (pfx == NULL)
3160 return -EINVAL;
3161
3162 if (tb[IFA_CACHEINFO]) {
3163 struct ifa_cacheinfo *ci;
3164
3165 ci = nla_data(tb[IFA_CACHEINFO]);
3166 valid_lft = ci->ifa_valid;
3167 preferred_lft = ci->ifa_prefered;
3168 } else {
3169 preferred_lft = INFINITY_LIFE_TIME;
3170 valid_lft = INFINITY_LIFE_TIME;
3171 }
3172
3173 dev = __dev_get_by_index(ifm->ifa_index);
3174 if (dev == NULL)
3175 return -ENODEV;
3176
3177 /* We ignore other flags so far. */
3178 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3179
3180 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3181 if (ifa == NULL) {
3182 /*
3183 * It would be best to check for !NLM_F_CREATE here but
3184 * userspace alreay relies on not having to provide this.
3185 */
3186 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3187 ifa_flags, preferred_lft, valid_lft);
3188 }
3189
3190 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3191 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3192 err = -EEXIST;
3193 else
3194 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3195
3196 in6_ifa_put(ifa);
3197
3198 return err;
3199 }
3200
3201 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3202 u8 scope, int ifindex)
3203 {
3204 struct ifaddrmsg *ifm;
3205
3206 ifm = nlmsg_data(nlh);
3207 ifm->ifa_family = AF_INET6;
3208 ifm->ifa_prefixlen = prefixlen;
3209 ifm->ifa_flags = flags;
3210 ifm->ifa_scope = scope;
3211 ifm->ifa_index = ifindex;
3212 }
3213
3214 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3215 unsigned long tstamp, u32 preferred, u32 valid)
3216 {
3217 struct ifa_cacheinfo ci;
3218
3219 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3220 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3221 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3222 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3223 ci.ifa_prefered = preferred;
3224 ci.ifa_valid = valid;
3225
3226 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3227 }
3228
3229 static inline int rt_scope(int ifa_scope)
3230 {
3231 if (ifa_scope & IFA_HOST)
3232 return RT_SCOPE_HOST;
3233 else if (ifa_scope & IFA_LINK)
3234 return RT_SCOPE_LINK;
3235 else if (ifa_scope & IFA_SITE)
3236 return RT_SCOPE_SITE;
3237 else
3238 return RT_SCOPE_UNIVERSE;
3239 }
3240
3241 static inline int inet6_ifaddr_msgsize(void)
3242 {
3243 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3244 + nla_total_size(16) /* IFA_ADDRESS */
3245 + nla_total_size(sizeof(struct ifa_cacheinfo));
3246 }
3247
3248 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3249 u32 pid, u32 seq, int event, unsigned int flags)
3250 {
3251 struct nlmsghdr *nlh;
3252 u32 preferred, valid;
3253
3254 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3255 if (nlh == NULL)
3256 return -EMSGSIZE;
3257
3258 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3259 ifa->idev->dev->ifindex);
3260
3261 if (!(ifa->flags&IFA_F_PERMANENT)) {
3262 preferred = ifa->prefered_lft;
3263 valid = ifa->valid_lft;
3264 if (preferred != INFINITY_LIFE_TIME) {
3265 long tval = (jiffies - ifa->tstamp)/HZ;
3266 if (preferred > tval)
3267 preferred -= tval;
3268 else
3269 preferred = 0;
3270 if (valid != INFINITY_LIFE_TIME)
3271 valid -= tval;
3272 }
3273 } else {
3274 preferred = INFINITY_LIFE_TIME;
3275 valid = INFINITY_LIFE_TIME;
3276 }
3277
3278 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3279 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3280 nlmsg_cancel(skb, nlh);
3281 return -EMSGSIZE;
3282 }
3283
3284 return nlmsg_end(skb, nlh);
3285 }
3286
3287 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3288 u32 pid, u32 seq, int event, u16 flags)
3289 {
3290 struct nlmsghdr *nlh;
3291 u8 scope = RT_SCOPE_UNIVERSE;
3292 int ifindex = ifmca->idev->dev->ifindex;
3293
3294 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3295 scope = RT_SCOPE_SITE;
3296
3297 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3298 if (nlh == NULL)
3299 return -EMSGSIZE;
3300
3301 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3302 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3303 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3304 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3305 nlmsg_cancel(skb, nlh);
3306 return -EMSGSIZE;
3307 }
3308
3309 return nlmsg_end(skb, nlh);
3310 }
3311
3312 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3313 u32 pid, u32 seq, int event, unsigned int flags)
3314 {
3315 struct nlmsghdr *nlh;
3316 u8 scope = RT_SCOPE_UNIVERSE;
3317 int ifindex = ifaca->aca_idev->dev->ifindex;
3318
3319 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3320 scope = RT_SCOPE_SITE;
3321
3322 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3323 if (nlh == NULL)
3324 return -EMSGSIZE;
3325
3326 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3327 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3328 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3329 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3330 nlmsg_cancel(skb, nlh);
3331 return -EMSGSIZE;
3332 }
3333
3334 return nlmsg_end(skb, nlh);
3335 }
3336
3337 enum addr_type_t
3338 {
3339 UNICAST_ADDR,
3340 MULTICAST_ADDR,
3341 ANYCAST_ADDR,
3342 };
3343
3344 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3345 enum addr_type_t type)
3346 {
3347 int idx, ip_idx;
3348 int s_idx, s_ip_idx;
3349 int err = 1;
3350 struct net_device *dev;
3351 struct inet6_dev *idev = NULL;
3352 struct inet6_ifaddr *ifa;
3353 struct ifmcaddr6 *ifmca;
3354 struct ifacaddr6 *ifaca;
3355
3356 s_idx = cb->args[0];
3357 s_ip_idx = ip_idx = cb->args[1];
3358
3359 idx = 0;
3360 for_each_netdev(dev) {
3361 if (idx < s_idx)
3362 goto cont;
3363 if (idx > s_idx)
3364 s_ip_idx = 0;
3365 ip_idx = 0;
3366 if ((idev = in6_dev_get(dev)) == NULL)
3367 goto cont;
3368 read_lock_bh(&idev->lock);
3369 switch (type) {
3370 case UNICAST_ADDR:
3371 /* unicast address incl. temp addr */
3372 for (ifa = idev->addr_list; ifa;
3373 ifa = ifa->if_next, ip_idx++) {
3374 if (ip_idx < s_ip_idx)
3375 continue;
3376 if ((err = inet6_fill_ifaddr(skb, ifa,
3377 NETLINK_CB(cb->skb).pid,
3378 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3379 NLM_F_MULTI)) <= 0)
3380 goto done;
3381 }
3382 break;
3383 case MULTICAST_ADDR:
3384 /* multicast address */
3385 for (ifmca = idev->mc_list; ifmca;
3386 ifmca = ifmca->next, ip_idx++) {
3387 if (ip_idx < s_ip_idx)
3388 continue;
3389 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3390 NETLINK_CB(cb->skb).pid,
3391 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3392 NLM_F_MULTI)) <= 0)
3393 goto done;
3394 }
3395 break;
3396 case ANYCAST_ADDR:
3397 /* anycast address */
3398 for (ifaca = idev->ac_list; ifaca;
3399 ifaca = ifaca->aca_next, ip_idx++) {
3400 if (ip_idx < s_ip_idx)
3401 continue;
3402 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3403 NETLINK_CB(cb->skb).pid,
3404 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3405 NLM_F_MULTI)) <= 0)
3406 goto done;
3407 }
3408 break;
3409 default:
3410 break;
3411 }
3412 read_unlock_bh(&idev->lock);
3413 in6_dev_put(idev);
3414 cont:
3415 idx++;
3416 }
3417 done:
3418 if (err <= 0) {
3419 read_unlock_bh(&idev->lock);
3420 in6_dev_put(idev);
3421 }
3422 cb->args[0] = idx;
3423 cb->args[1] = ip_idx;
3424 return skb->len;
3425 }
3426
3427 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3428 {
3429 enum addr_type_t type = UNICAST_ADDR;
3430 return inet6_dump_addr(skb, cb, type);
3431 }
3432
3433 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3434 {
3435 enum addr_type_t type = MULTICAST_ADDR;
3436 return inet6_dump_addr(skb, cb, type);
3437 }
3438
3439
3440 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3441 {
3442 enum addr_type_t type = ANYCAST_ADDR;
3443 return inet6_dump_addr(skb, cb, type);
3444 }
3445
3446 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3447 void *arg)
3448 {
3449 struct ifaddrmsg *ifm;
3450 struct nlattr *tb[IFA_MAX+1];
3451 struct in6_addr *addr = NULL;
3452 struct net_device *dev = NULL;
3453 struct inet6_ifaddr *ifa;
3454 struct sk_buff *skb;
3455 int err;
3456
3457 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3458 if (err < 0)
3459 goto errout;
3460
3461 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3462 if (addr == NULL) {
3463 err = -EINVAL;
3464 goto errout;
3465 }
3466
3467 ifm = nlmsg_data(nlh);
3468 if (ifm->ifa_index)
3469 dev = __dev_get_by_index(ifm->ifa_index);
3470
3471 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3472 err = -EADDRNOTAVAIL;
3473 goto errout;
3474 }
3475
3476 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3477 err = -ENOBUFS;
3478 goto errout_ifa;
3479 }
3480
3481 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3482 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3483 if (err < 0) {
3484 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3485 WARN_ON(err == -EMSGSIZE);
3486 kfree_skb(skb);
3487 goto errout_ifa;
3488 }
3489 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3490 errout_ifa:
3491 in6_ifa_put(ifa);
3492 errout:
3493 return err;
3494 }
3495
3496 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3497 {
3498 struct sk_buff *skb;
3499 int err = -ENOBUFS;
3500
3501 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3502 if (skb == NULL)
3503 goto errout;
3504
3505 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3506 if (err < 0) {
3507 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3508 WARN_ON(err == -EMSGSIZE);
3509 kfree_skb(skb);
3510 goto errout;
3511 }
3512 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3513 errout:
3514 if (err < 0)
3515 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3516 }
3517
3518 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3519 __s32 *array, int bytes)
3520 {
3521 BUG_ON(bytes < (DEVCONF_MAX * 4));
3522
3523 memset(array, 0, bytes);
3524 array[DEVCONF_FORWARDING] = cnf->forwarding;
3525 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3526 array[DEVCONF_MTU6] = cnf->mtu6;
3527 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3528 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3529 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3530 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3531 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3532 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3533 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3534 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3535 #ifdef CONFIG_IPV6_PRIVACY
3536 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3537 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3538 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3539 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3540 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3541 #endif
3542 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3543 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3544 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3545 #ifdef CONFIG_IPV6_ROUTER_PREF
3546 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3547 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3548 #ifdef CONFIG_IPV6_ROUTE_INFO
3549 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3550 #endif
3551 #endif
3552 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3553 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3554 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3555 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3556 #endif
3557 #ifdef CONFIG_IPV6_MROUTE
3558 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3559 #endif
3560 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3561 }
3562
3563 static inline size_t inet6_if_nlmsg_size(void)
3564 {
3565 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3566 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3567 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3568 + nla_total_size(4) /* IFLA_MTU */
3569 + nla_total_size(4) /* IFLA_LINK */
3570 + nla_total_size( /* IFLA_PROTINFO */
3571 nla_total_size(4) /* IFLA_INET6_FLAGS */
3572 + nla_total_size(sizeof(struct ifla_cacheinfo))
3573 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3574 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3575 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3576 );
3577 }
3578
3579 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3580 int bytes)
3581 {
3582 int i;
3583 int pad = bytes - sizeof(u64) * items;
3584 BUG_ON(pad < 0);
3585
3586 /* Use put_unaligned() because stats may not be aligned for u64. */
3587 put_unaligned(items, &stats[0]);
3588 for (i = 1; i < items; i++)
3589 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3590
3591 memset(&stats[items], 0, pad);
3592 }
3593
3594 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3595 int bytes)
3596 {
3597 switch(attrtype) {
3598 case IFLA_INET6_STATS:
3599 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3600 break;
3601 case IFLA_INET6_ICMP6STATS:
3602 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3603 break;
3604 }
3605 }
3606
3607 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3608 u32 pid, u32 seq, int event, unsigned int flags)
3609 {
3610 struct net_device *dev = idev->dev;
3611 struct nlattr *nla;
3612 struct ifinfomsg *hdr;
3613 struct nlmsghdr *nlh;
3614 void *protoinfo;
3615 struct ifla_cacheinfo ci;
3616
3617 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3618 if (nlh == NULL)
3619 return -EMSGSIZE;
3620
3621 hdr = nlmsg_data(nlh);
3622 hdr->ifi_family = AF_INET6;
3623 hdr->__ifi_pad = 0;
3624 hdr->ifi_type = dev->type;
3625 hdr->ifi_index = dev->ifindex;
3626 hdr->ifi_flags = dev_get_flags(dev);
3627 hdr->ifi_change = 0;
3628
3629 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3630
3631 if (dev->addr_len)
3632 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3633
3634 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3635 if (dev->ifindex != dev->iflink)
3636 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3637
3638 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3639 if (protoinfo == NULL)
3640 goto nla_put_failure;
3641
3642 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3643
3644 ci.max_reasm_len = IPV6_MAXPLEN;
3645 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3646 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3647 ci.reachable_time = idev->nd_parms->reachable_time;
3648 ci.retrans_time = idev->nd_parms->retrans_time;
3649 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3650
3651 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3652 if (nla == NULL)
3653 goto nla_put_failure;
3654 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3655
3656 /* XXX - MC not implemented */
3657
3658 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3659 if (nla == NULL)
3660 goto nla_put_failure;
3661 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3662
3663 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3664 if (nla == NULL)
3665 goto nla_put_failure;
3666 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3667
3668 nla_nest_end(skb, protoinfo);
3669 return nlmsg_end(skb, nlh);
3670
3671 nla_put_failure:
3672 nlmsg_cancel(skb, nlh);
3673 return -EMSGSIZE;
3674 }
3675
3676 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3677 {
3678 int idx, err;
3679 int s_idx = cb->args[0];
3680 struct net_device *dev;
3681 struct inet6_dev *idev;
3682
3683 read_lock(&dev_base_lock);
3684 idx = 0;
3685 for_each_netdev(dev) {
3686 if (idx < s_idx)
3687 goto cont;
3688 if ((idev = in6_dev_get(dev)) == NULL)
3689 goto cont;
3690 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3691 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3692 in6_dev_put(idev);
3693 if (err <= 0)
3694 break;
3695 cont:
3696 idx++;
3697 }
3698 read_unlock(&dev_base_lock);
3699 cb->args[0] = idx;
3700
3701 return skb->len;
3702 }
3703
3704 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3705 {
3706 struct sk_buff *skb;
3707 int err = -ENOBUFS;
3708
3709 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3710 if (skb == NULL)
3711 goto errout;
3712
3713 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3714 if (err < 0) {
3715 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3716 WARN_ON(err == -EMSGSIZE);
3717 kfree_skb(skb);
3718 goto errout;
3719 }
3720 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
3721 errout:
3722 if (err < 0)
3723 rtnl_set_sk_err(RTNLGRP_IPV6_IFINFO, err);
3724 }
3725
3726 static inline size_t inet6_prefix_nlmsg_size(void)
3727 {
3728 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3729 + nla_total_size(sizeof(struct in6_addr))
3730 + nla_total_size(sizeof(struct prefix_cacheinfo));
3731 }
3732
3733 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3734 struct prefix_info *pinfo, u32 pid, u32 seq,
3735 int event, unsigned int flags)
3736 {
3737 struct prefixmsg *pmsg;
3738 struct nlmsghdr *nlh;
3739 struct prefix_cacheinfo ci;
3740
3741 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3742 if (nlh == NULL)
3743 return -EMSGSIZE;
3744
3745 pmsg = nlmsg_data(nlh);
3746 pmsg->prefix_family = AF_INET6;
3747 pmsg->prefix_pad1 = 0;
3748 pmsg->prefix_pad2 = 0;
3749 pmsg->prefix_ifindex = idev->dev->ifindex;
3750 pmsg->prefix_len = pinfo->prefix_len;
3751 pmsg->prefix_type = pinfo->type;
3752 pmsg->prefix_pad3 = 0;
3753 pmsg->prefix_flags = 0;
3754 if (pinfo->onlink)
3755 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3756 if (pinfo->autoconf)
3757 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3758
3759 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3760
3761 ci.preferred_time = ntohl(pinfo->prefered);
3762 ci.valid_time = ntohl(pinfo->valid);
3763 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3764
3765 return nlmsg_end(skb, nlh);
3766
3767 nla_put_failure:
3768 nlmsg_cancel(skb, nlh);
3769 return -EMSGSIZE;
3770 }
3771
3772 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3773 struct prefix_info *pinfo)
3774 {
3775 struct sk_buff *skb;
3776 int err = -ENOBUFS;
3777
3778 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3779 if (skb == NULL)
3780 goto errout;
3781
3782 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3783 if (err < 0) {
3784 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3785 WARN_ON(err == -EMSGSIZE);
3786 kfree_skb(skb);
3787 goto errout;
3788 }
3789 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3790 errout:
3791 if (err < 0)
3792 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3793 }
3794
3795 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3796 {
3797 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3798
3799 switch (event) {
3800 case RTM_NEWADDR:
3801 /*
3802 * If the address was optimistic
3803 * we inserted the route at the start of
3804 * our DAD process, so we don't need
3805 * to do it again
3806 */
3807 if (!(ifp->rt->rt6i_node))
3808 ip6_ins_rt(ifp->rt);
3809 if (ifp->idev->cnf.forwarding)
3810 addrconf_join_anycast(ifp);
3811 break;
3812 case RTM_DELADDR:
3813 if (ifp->idev->cnf.forwarding)
3814 addrconf_leave_anycast(ifp);
3815 addrconf_leave_solict(ifp->idev, &ifp->addr);
3816 dst_hold(&ifp->rt->u.dst);
3817 if (ip6_del_rt(ifp->rt))
3818 dst_free(&ifp->rt->u.dst);
3819 break;
3820 }
3821 }
3822
3823 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3824 {
3825 rcu_read_lock_bh();
3826 if (likely(ifp->idev->dead == 0))
3827 __ipv6_ifa_notify(event, ifp);
3828 rcu_read_unlock_bh();
3829 }
3830
3831 #ifdef CONFIG_SYSCTL
3832
3833 static
3834 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3835 void __user *buffer, size_t *lenp, loff_t *ppos)
3836 {
3837 int *valp = ctl->data;
3838 int val = *valp;
3839 int ret;
3840
3841 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3842
3843 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3844 if (valp != &ipv6_devconf.forwarding) {
3845 if ((!*valp) ^ (!val)) {
3846 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3847 if (idev == NULL)
3848 return ret;
3849 dev_forward_change(idev);
3850 }
3851 } else {
3852 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3853 addrconf_forward_change();
3854 }
3855 if (*valp)
3856 rt6_purge_dflt_routers();
3857 }
3858
3859 return ret;
3860 }
3861
3862 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3863 int __user *name, int nlen,
3864 void __user *oldval,
3865 size_t __user *oldlenp,
3866 void __user *newval, size_t newlen)
3867 {
3868 int *valp = table->data;
3869 int new;
3870
3871 if (!newval || !newlen)
3872 return 0;
3873 if (newlen != sizeof(int))
3874 return -EINVAL;
3875 if (get_user(new, (int __user *)newval))
3876 return -EFAULT;
3877 if (new == *valp)
3878 return 0;
3879 if (oldval && oldlenp) {
3880 size_t len;
3881 if (get_user(len, oldlenp))
3882 return -EFAULT;
3883 if (len) {
3884 if (len > table->maxlen)
3885 len = table->maxlen;
3886 if (copy_to_user(oldval, valp, len))
3887 return -EFAULT;
3888 if (put_user(len, oldlenp))
3889 return -EFAULT;
3890 }
3891 }
3892
3893 if (valp != &ipv6_devconf_dflt.forwarding) {
3894 if (valp != &ipv6_devconf.forwarding) {
3895 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3896 int changed;
3897 if (unlikely(idev == NULL))
3898 return -ENODEV;
3899 changed = (!*valp) ^ (!new);
3900 *valp = new;
3901 if (changed)
3902 dev_forward_change(idev);
3903 } else {
3904 *valp = new;
3905 addrconf_forward_change();
3906 }
3907
3908 if (*valp)
3909 rt6_purge_dflt_routers();
3910 } else
3911 *valp = new;
3912
3913 return 1;
3914 }
3915
3916 static void dev_disable_change(struct inet6_dev *idev)
3917 {
3918 if (!idev || !idev->dev)
3919 return;
3920
3921 if (idev->cnf.disable_ipv6)
3922 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
3923 else
3924 addrconf_notify(NULL, NETDEV_UP, idev->dev);
3925 }
3926
3927 static int addrconf_disable_ipv6(struct ctl_table *table, int *valp, int old)
3928 {
3929 if (valp == &ipv6_devconf_dflt.disable_ipv6)
3930 return 0;
3931
3932 if (!rtnl_trylock()) {
3933 /* Restore the original values before restarting */
3934 *valp = old;
3935 return restart_syscall();
3936 }
3937
3938 if (valp == &ipv6_devconf.disable_ipv6) {
3939 struct net_device *dev;
3940 struct inet6_dev *idev;
3941
3942 read_lock(&dev_base_lock);
3943 for_each_netdev(dev) {
3944 rcu_read_lock();
3945 idev = __in6_dev_get(dev);
3946 if (idev) {
3947 int changed = (!idev->cnf.disable_ipv6) ^ (!*valp);
3948 idev->cnf.disable_ipv6 = *valp;
3949 if (changed)
3950 dev_disable_change(idev);
3951 }
3952 rcu_read_unlock();
3953 }
3954 read_unlock(&dev_base_lock);
3955 }
3956
3957 rtnl_unlock();
3958 return 0;
3959 }
3960
3961 static int addrconf_sysctl_disable(ctl_table *ctl, int write, struct file * filp,
3962 void __user *buffer, size_t *lenp, loff_t *ppos)
3963 {
3964 int *valp = ctl->data;
3965 int val = *valp;
3966 loff_t pos = *ppos;
3967 int ret;
3968
3969 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3970
3971 if (write)
3972 ret = addrconf_disable_ipv6(ctl, valp, val);
3973 if (ret)
3974 *ppos = pos;
3975 return ret;
3976 }
3977
3978 static struct addrconf_sysctl_table
3979 {
3980 struct ctl_table_header *sysctl_header;
3981 ctl_table addrconf_vars[__NET_IPV6_MAX];
3982 ctl_table addrconf_dev[2];
3983 ctl_table addrconf_conf_dir[2];
3984 ctl_table addrconf_proto_dir[2];
3985 ctl_table addrconf_root_dir[2];
3986 } addrconf_sysctl __read_mostly = {
3987 .sysctl_header = NULL,
3988 .addrconf_vars = {
3989 {
3990 .ctl_name = NET_IPV6_FORWARDING,
3991 .procname = "forwarding",
3992 .data = &ipv6_devconf.forwarding,
3993 .maxlen = sizeof(int),
3994 .mode = 0644,
3995 .proc_handler = &addrconf_sysctl_forward,
3996 .strategy = &addrconf_sysctl_forward_strategy,
3997 },
3998 {
3999 .ctl_name = NET_IPV6_HOP_LIMIT,
4000 .procname = "hop_limit",
4001 .data = &ipv6_devconf.hop_limit,
4002 .maxlen = sizeof(int),
4003 .mode = 0644,
4004 .proc_handler = proc_dointvec,
4005 },
4006 {
4007 .ctl_name = NET_IPV6_MTU,
4008 .procname = "mtu",
4009 .data = &ipv6_devconf.mtu6,
4010 .maxlen = sizeof(int),
4011 .mode = 0644,
4012 .proc_handler = &proc_dointvec,
4013 },
4014 {
4015 .ctl_name = NET_IPV6_ACCEPT_RA,
4016 .procname = "accept_ra",
4017 .data = &ipv6_devconf.accept_ra,
4018 .maxlen = sizeof(int),
4019 .mode = 0644,
4020 .proc_handler = &proc_dointvec,
4021 },
4022 {
4023 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
4024 .procname = "accept_redirects",
4025 .data = &ipv6_devconf.accept_redirects,
4026 .maxlen = sizeof(int),
4027 .mode = 0644,
4028 .proc_handler = &proc_dointvec,
4029 },
4030 {
4031 .ctl_name = NET_IPV6_AUTOCONF,
4032 .procname = "autoconf",
4033 .data = &ipv6_devconf.autoconf,
4034 .maxlen = sizeof(int),
4035 .mode = 0644,
4036 .proc_handler = &proc_dointvec,
4037 },
4038 {
4039 .ctl_name = NET_IPV6_DAD_TRANSMITS,
4040 .procname = "dad_transmits",
4041 .data = &ipv6_devconf.dad_transmits,
4042 .maxlen = sizeof(int),
4043 .mode = 0644,
4044 .proc_handler = &proc_dointvec,
4045 },
4046 {
4047 .ctl_name = NET_IPV6_RTR_SOLICITS,
4048 .procname = "router_solicitations",
4049 .data = &ipv6_devconf.rtr_solicits,
4050 .maxlen = sizeof(int),
4051 .mode = 0644,
4052 .proc_handler = &proc_dointvec,
4053 },
4054 {
4055 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
4056 .procname = "router_solicitation_interval",
4057 .data = &ipv6_devconf.rtr_solicit_interval,
4058 .maxlen = sizeof(int),
4059 .mode = 0644,
4060 .proc_handler = &proc_dointvec_jiffies,
4061 .strategy = &sysctl_jiffies,
4062 },
4063 {
4064 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
4065 .procname = "router_solicitation_delay",
4066 .data = &ipv6_devconf.rtr_solicit_delay,
4067 .maxlen = sizeof(int),
4068 .mode = 0644,
4069 .proc_handler = &proc_dointvec_jiffies,
4070 .strategy = &sysctl_jiffies,
4071 },
4072 {
4073 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
4074 .procname = "force_mld_version",
4075 .data = &ipv6_devconf.force_mld_version,
4076 .maxlen = sizeof(int),
4077 .mode = 0644,
4078 .proc_handler = &proc_dointvec,
4079 },
4080 #ifdef CONFIG_IPV6_PRIVACY
4081 {
4082 .ctl_name = NET_IPV6_USE_TEMPADDR,
4083 .procname = "use_tempaddr",
4084 .data = &ipv6_devconf.use_tempaddr,
4085 .maxlen = sizeof(int),
4086 .mode = 0644,
4087 .proc_handler = &proc_dointvec,
4088 },
4089 {
4090 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
4091 .procname = "temp_valid_lft",
4092 .data = &ipv6_devconf.temp_valid_lft,
4093 .maxlen = sizeof(int),
4094 .mode = 0644,
4095 .proc_handler = &proc_dointvec,
4096 },
4097 {
4098 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4099 .procname = "temp_prefered_lft",
4100 .data = &ipv6_devconf.temp_prefered_lft,
4101 .maxlen = sizeof(int),
4102 .mode = 0644,
4103 .proc_handler = &proc_dointvec,
4104 },
4105 {
4106 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4107 .procname = "regen_max_retry",
4108 .data = &ipv6_devconf.regen_max_retry,
4109 .maxlen = sizeof(int),
4110 .mode = 0644,
4111 .proc_handler = &proc_dointvec,
4112 },
4113 {
4114 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4115 .procname = "max_desync_factor",
4116 .data = &ipv6_devconf.max_desync_factor,
4117 .maxlen = sizeof(int),
4118 .mode = 0644,
4119 .proc_handler = &proc_dointvec,
4120 },
4121 #endif
4122 {
4123 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4124 .procname = "max_addresses",
4125 .data = &ipv6_devconf.max_addresses,
4126 .maxlen = sizeof(int),
4127 .mode = 0644,
4128 .proc_handler = &proc_dointvec,
4129 },
4130 {
4131 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4132 .procname = "accept_ra_defrtr",
4133 .data = &ipv6_devconf.accept_ra_defrtr,
4134 .maxlen = sizeof(int),
4135 .mode = 0644,
4136 .proc_handler = &proc_dointvec,
4137 },
4138 {
4139 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4140 .procname = "accept_ra_pinfo",
4141 .data = &ipv6_devconf.accept_ra_pinfo,
4142 .maxlen = sizeof(int),
4143 .mode = 0644,
4144 .proc_handler = &proc_dointvec,
4145 },
4146 #ifdef CONFIG_IPV6_ROUTER_PREF
4147 {
4148 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4149 .procname = "accept_ra_rtr_pref",
4150 .data = &ipv6_devconf.accept_ra_rtr_pref,
4151 .maxlen = sizeof(int),
4152 .mode = 0644,
4153 .proc_handler = &proc_dointvec,
4154 },
4155 {
4156 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4157 .procname = "router_probe_interval",
4158 .data = &ipv6_devconf.rtr_probe_interval,
4159 .maxlen = sizeof(int),
4160 .mode = 0644,
4161 .proc_handler = &proc_dointvec_jiffies,
4162 .strategy = &sysctl_jiffies,
4163 },
4164 #ifdef CONFIG_IPV6_ROUTE_INFO
4165 {
4166 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4167 .procname = "accept_ra_rt_info_max_plen",
4168 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4169 .maxlen = sizeof(int),
4170 .mode = 0644,
4171 .proc_handler = &proc_dointvec,
4172 },
4173 #endif
4174 #endif
4175 {
4176 .ctl_name = NET_IPV6_PROXY_NDP,
4177 .procname = "proxy_ndp",
4178 .data = &ipv6_devconf.proxy_ndp,
4179 .maxlen = sizeof(int),
4180 .mode = 0644,
4181 .proc_handler = &proc_dointvec,
4182 },
4183 {
4184 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4185 .procname = "accept_source_route",
4186 .data = &ipv6_devconf.accept_source_route,
4187 .maxlen = sizeof(int),
4188 .mode = 0644,
4189 .proc_handler = &proc_dointvec,
4190 },
4191 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4192 {
4193 .ctl_name = CTL_UNNUMBERED,
4194 .procname = "optimistic_dad",
4195 .data = &ipv6_devconf.optimistic_dad,
4196 .maxlen = sizeof(int),
4197 .mode = 0644,
4198 .proc_handler = &proc_dointvec,
4199
4200 },
4201 #endif
4202 #ifdef CONFIG_IPV6_MROUTE
4203 {
4204 .ctl_name = CTL_UNNUMBERED,
4205 .procname = "mc_forwarding",
4206 .data = &ipv6_devconf.mc_forwarding,
4207 .maxlen = sizeof(int),
4208 .mode = 0644,
4209 .proc_handler = &proc_dointvec,
4210 },
4211 #endif
4212 {
4213 .ctl_name = CTL_UNNUMBERED,
4214 .procname = "disable_ipv6",
4215 .data = &ipv6_devconf.disable_ipv6,
4216 .maxlen = sizeof(int),
4217 .mode = 0644,
4218 .proc_handler = &addrconf_sysctl_disable,
4219 },
4220 {
4221 .ctl_name = 0, /* sentinel */
4222 }
4223 },
4224 .addrconf_dev = {
4225 {
4226 .ctl_name = NET_PROTO_CONF_ALL,
4227 .procname = "all",
4228 .mode = 0555,
4229 .child = addrconf_sysctl.addrconf_vars,
4230 },
4231 {
4232 .ctl_name = 0, /* sentinel */
4233 }
4234 },
4235 .addrconf_conf_dir = {
4236 {
4237 .ctl_name = NET_IPV6_CONF,
4238 .procname = "conf",
4239 .mode = 0555,
4240 .child = addrconf_sysctl.addrconf_dev,
4241 },
4242 {
4243 .ctl_name = 0, /* sentinel */
4244 }
4245 },
4246 .addrconf_proto_dir = {
4247 {
4248 .ctl_name = NET_IPV6,
4249 .procname = "ipv6",
4250 .mode = 0555,
4251 .child = addrconf_sysctl.addrconf_conf_dir,
4252 },
4253 {
4254 .ctl_name = 0, /* sentinel */
4255 }
4256 },
4257 .addrconf_root_dir = {
4258 {
4259 .ctl_name = CTL_NET,
4260 .procname = "net",
4261 .mode = 0555,
4262 .child = addrconf_sysctl.addrconf_proto_dir,
4263 },
4264 {
4265 .ctl_name = 0, /* sentinel */
4266 }
4267 },
4268 };
4269
4270 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4271 {
4272 int i;
4273 struct net_device *dev = idev ? idev->dev : NULL;
4274 struct addrconf_sysctl_table *t;
4275 char *dev_name = NULL;
4276
4277 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4278 if (t == NULL)
4279 return;
4280 for (i=0; t->addrconf_vars[i].data; i++) {
4281 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4282 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4283 }
4284 if (dev) {
4285 dev_name = dev->name;
4286 t->addrconf_dev[0].ctl_name = dev->ifindex;
4287 } else {
4288 dev_name = "default";
4289 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4290 }
4291
4292 /*
4293 * Make a copy of dev_name, because '.procname' is regarded as const
4294 * by sysctl and we wouldn't want anyone to change it under our feet
4295 * (see SIOCSIFNAME).
4296 */
4297 dev_name = kstrdup(dev_name, GFP_KERNEL);
4298 if (!dev_name)
4299 goto free;
4300
4301 t->addrconf_dev[0].procname = dev_name;
4302
4303 t->addrconf_dev[0].child = t->addrconf_vars;
4304 t->addrconf_conf_dir[0].child = t->addrconf_dev;
4305 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
4306 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
4307
4308 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
4309 if (t->sysctl_header == NULL)
4310 goto free_procname;
4311 else
4312 p->sysctl = t;
4313 return;
4314
4315 /* error path */
4316 free_procname:
4317 kfree(dev_name);
4318 free:
4319 kfree(t);
4320
4321 return;
4322 }
4323
4324 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4325 {
4326 if (p->sysctl) {
4327 struct addrconf_sysctl_table *t = p->sysctl;
4328 p->sysctl = NULL;
4329 unregister_sysctl_table(t->sysctl_header);
4330 kfree(t->addrconf_dev[0].procname);
4331 kfree(t);
4332 }
4333 }
4334
4335
4336 #endif
4337
4338 /*
4339 * Device notifier
4340 */
4341
4342 int register_inet6addr_notifier(struct notifier_block *nb)
4343 {
4344 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4345 }
4346
4347 EXPORT_SYMBOL(register_inet6addr_notifier);
4348
4349 int unregister_inet6addr_notifier(struct notifier_block *nb)
4350 {
4351 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4352 }
4353
4354 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4355
4356 /*
4357 * Init / cleanup code
4358 */
4359
4360 int __init addrconf_init(void)
4361 {
4362 int err = 0;
4363
4364 /* The addrconf netdev notifier requires that loopback_dev
4365 * has it's ipv6 private information allocated and setup
4366 * before it can bring up and give link-local addresses
4367 * to other devices which are up.
4368 *
4369 * Unfortunately, loopback_dev is not necessarily the first
4370 * entry in the global dev_base list of net devices. In fact,
4371 * it is likely to be the very last entry on that list.
4372 * So this causes the notifier registry below to try and
4373 * give link-local addresses to all devices besides loopback_dev
4374 * first, then loopback_dev, which cases all the non-loopback_dev
4375 * devices to fail to get a link-local address.
4376 *
4377 * So, as a temporary fix, allocate the ipv6 structure for
4378 * loopback_dev first by hand.
4379 * Longer term, all of the dependencies ipv6 has upon the loopback
4380 * device and it being up should be removed.
4381 */
4382 rtnl_lock();
4383 if (!ipv6_add_dev(&loopback_dev))
4384 err = -ENOMEM;
4385 rtnl_unlock();
4386 if (err)
4387 return err;
4388
4389 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4390 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4391 ip6_prohibit_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4392 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4393 #endif
4394
4395 register_netdevice_notifier(&ipv6_dev_notf);
4396
4397 addrconf_verify(0);
4398
4399 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4400 if (err < 0)
4401 goto errout;
4402
4403 /* Only the first call to __rtnl_register can fail */
4404 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4405 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4406 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4407 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4408 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4409
4410 #ifdef CONFIG_SYSCTL
4411 addrconf_sysctl.sysctl_header =
4412 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
4413 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4414 #endif
4415
4416 return 0;
4417 errout:
4418 unregister_netdevice_notifier(&ipv6_dev_notf);
4419
4420 return err;
4421 }
4422
4423 void __exit addrconf_cleanup(void)
4424 {
4425 struct net_device *dev;
4426 struct inet6_dev *idev;
4427 struct inet6_ifaddr *ifa;
4428 int i;
4429
4430 unregister_netdevice_notifier(&ipv6_dev_notf);
4431
4432 #ifdef CONFIG_SYSCTL
4433 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4434 addrconf_sysctl_unregister(&ipv6_devconf);
4435 #endif
4436
4437 rtnl_lock();
4438
4439 /*
4440 * clean dev list.
4441 */
4442
4443 for_each_netdev(dev) {
4444 if ((idev = __in6_dev_get(dev)) == NULL)
4445 continue;
4446 addrconf_ifdown(dev, 1);
4447 }
4448 addrconf_ifdown(&loopback_dev, 2);
4449
4450 /*
4451 * Check hash table.
4452 */
4453
4454 write_lock_bh(&addrconf_hash_lock);
4455 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4456 for (ifa=inet6_addr_lst[i]; ifa; ) {
4457 struct inet6_ifaddr *bifa;
4458
4459 bifa = ifa;
4460 ifa = ifa->lst_next;
4461 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4462 /* Do not free it; something is wrong.
4463 Now we can investigate it with debugger.
4464 */
4465 }
4466 }
4467 write_unlock_bh(&addrconf_hash_lock);
4468
4469 del_timer(&addr_chk_timer);
4470
4471 rtnl_unlock();
4472
4473 #ifdef CONFIG_PROC_FS
4474 proc_net_remove("if_inet6");
4475 #endif
4476 }
Tomato firmware and modifications.