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autofs4 - fix missed case when changing to use struct path
[linux-2.6/mini2440.git] / net / ipv6 / addrconf.c
blob43b3c9f89c12c5dfac56d70eac73b8718ea73650
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/kernel.h>
44 #include <linux/socket.h>
45 #include <linux/sockios.h>
46 #include <linux/net.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #ifdef CONFIG_SYSCTL
57 #include <linux/sysctl.h>
58 #endif
59 #include <linux/capability.h>
60 #include <linux/delay.h>
61 #include <linux/notifier.h>
62 #include <linux/string.h>
63
64 #include <net/net_namespace.h>
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);
104 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
105 #else
106 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
107 {
108 }
109
110 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
111 {
112 }
113 #endif
114
115 #ifdef CONFIG_IPV6_PRIVACY
116 static int __ipv6_regen_rndid(struct inet6_dev *idev);
117 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
118 static void ipv6_regen_rndid(unsigned long data);
119
120 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
121 #endif
122
123 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
124 static int ipv6_count_addresses(struct inet6_dev *idev);
125
126 /*
127 * Configured unicast address hash table
128 */
129 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
130 static DEFINE_RWLOCK(addrconf_hash_lock);
131
132 static void addrconf_verify(unsigned long);
133
134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
135 static DEFINE_SPINLOCK(addrconf_verify_lock);
136
137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139
140 static int addrconf_ifdown(struct net_device *dev, int how);
141
142 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
143 static void addrconf_dad_timer(unsigned long data);
144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
145 static void addrconf_dad_run(struct inet6_dev *idev);
146 static void addrconf_rs_timer(unsigned long data);
147 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
149
150 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
151 struct prefix_info *pinfo);
152 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
153 struct net_device *dev);
154
155 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
156
157 static struct ipv6_devconf ipv6_devconf __read_mostly = {
158 .forwarding = 0,
159 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
160 .mtu6 = IPV6_MIN_MTU,
161 .accept_ra = 1,
162 .accept_redirects = 1,
163 .autoconf = 1,
164 .force_mld_version = 0,
165 .dad_transmits = 1,
166 .rtr_solicits = MAX_RTR_SOLICITATIONS,
167 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
168 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
169 #ifdef CONFIG_IPV6_PRIVACY
170 .use_tempaddr = 0,
171 .temp_valid_lft = TEMP_VALID_LIFETIME,
172 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
173 .regen_max_retry = REGEN_MAX_RETRY,
174 .max_desync_factor = MAX_DESYNC_FACTOR,
175 #endif
176 .max_addresses = IPV6_MAX_ADDRESSES,
177 .accept_ra_defrtr = 1,
178 .accept_ra_pinfo = 1,
179 #ifdef CONFIG_IPV6_ROUTER_PREF
180 .accept_ra_rtr_pref = 1,
181 .rtr_probe_interval = 60 * HZ,
182 #ifdef CONFIG_IPV6_ROUTE_INFO
183 .accept_ra_rt_info_max_plen = 0,
184 #endif
185 #endif
186 .proxy_ndp = 0,
187 .accept_source_route = 0, /* we do not accept RH0 by default. */
188 .disable_ipv6 = 0,
189 .accept_dad = 1,
190 };
191
192 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
193 .forwarding = 0,
194 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
195 .mtu6 = IPV6_MIN_MTU,
196 .accept_ra = 1,
197 .accept_redirects = 1,
198 .autoconf = 1,
199 .dad_transmits = 1,
200 .rtr_solicits = MAX_RTR_SOLICITATIONS,
201 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
202 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
203 #ifdef CONFIG_IPV6_PRIVACY
204 .use_tempaddr = 0,
205 .temp_valid_lft = TEMP_VALID_LIFETIME,
206 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
207 .regen_max_retry = REGEN_MAX_RETRY,
208 .max_desync_factor = MAX_DESYNC_FACTOR,
209 #endif
210 .max_addresses = IPV6_MAX_ADDRESSES,
211 .accept_ra_defrtr = 1,
212 .accept_ra_pinfo = 1,
213 #ifdef CONFIG_IPV6_ROUTER_PREF
214 .accept_ra_rtr_pref = 1,
215 .rtr_probe_interval = 60 * HZ,
216 #ifdef CONFIG_IPV6_ROUTE_INFO
217 .accept_ra_rt_info_max_plen = 0,
218 #endif
219 #endif
220 .proxy_ndp = 0,
221 .accept_source_route = 0, /* we do not accept RH0 by default. */
222 .disable_ipv6 = 0,
223 .accept_dad = 1,
224 };
225
226 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
227 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
228 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
229 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
230 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
231
232 /* Check if a valid qdisc is available */
233 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
234 {
235 return !qdisc_tx_is_noop(dev);
236 }
237
238 /* Check if a route is valid prefix route */
239 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
240 {
241 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
242 }
243
244 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
245 {
246 if (del_timer(&ifp->timer))
247 __in6_ifa_put(ifp);
248 }
249
250 enum addrconf_timer_t
251 {
252 AC_NONE,
253 AC_DAD,
254 AC_RS,
255 };
256
257 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
258 enum addrconf_timer_t what,
259 unsigned long when)
260 {
261 if (!del_timer(&ifp->timer))
262 in6_ifa_hold(ifp);
263
264 switch (what) {
265 case AC_DAD:
266 ifp->timer.function = addrconf_dad_timer;
267 break;
268 case AC_RS:
269 ifp->timer.function = addrconf_rs_timer;
270 break;
271 default:;
272 }
273 ifp->timer.expires = jiffies + when;
274 add_timer(&ifp->timer);
275 }
276
277 static int snmp6_alloc_dev(struct inet6_dev *idev)
278 {
279 if (snmp_mib_init((void **)idev->stats.ipv6,
280 sizeof(struct ipstats_mib)) < 0)
281 goto err_ip;
282 if (snmp_mib_init((void **)idev->stats.icmpv6,
283 sizeof(struct icmpv6_mib)) < 0)
284 goto err_icmp;
285 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
286 sizeof(struct icmpv6msg_mib)) < 0)
287 goto err_icmpmsg;
288
289 return 0;
290
291 err_icmpmsg:
292 snmp_mib_free((void **)idev->stats.icmpv6);
293 err_icmp:
294 snmp_mib_free((void **)idev->stats.ipv6);
295 err_ip:
296 return -ENOMEM;
297 }
298
299 static void snmp6_free_dev(struct inet6_dev *idev)
300 {
301 snmp_mib_free((void **)idev->stats.icmpv6msg);
302 snmp_mib_free((void **)idev->stats.icmpv6);
303 snmp_mib_free((void **)idev->stats.ipv6);
304 }
305
306 /* Nobody refers to this device, we may destroy it. */
307
308 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
309 {
310 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
311 kfree(idev);
312 }
313
314 void in6_dev_finish_destroy(struct inet6_dev *idev)
315 {
316 struct net_device *dev = idev->dev;
317
318 WARN_ON(idev->addr_list != NULL);
319 WARN_ON(idev->mc_list != NULL);
320
321 #ifdef NET_REFCNT_DEBUG
322 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
323 #endif
324 dev_put(dev);
325 if (!idev->dead) {
326 printk("Freeing alive inet6 device %p\n", idev);
327 return;
328 }
329 snmp6_free_dev(idev);
330 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
331 }
332
333 EXPORT_SYMBOL(in6_dev_finish_destroy);
334
335 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
336 {
337 struct inet6_dev *ndev;
338
339 ASSERT_RTNL();
340
341 if (dev->mtu < IPV6_MIN_MTU)
342 return NULL;
343
344 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
345
346 if (ndev == NULL)
347 return NULL;
348
349 rwlock_init(&ndev->lock);
350 ndev->dev = dev;
351 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
352 ndev->cnf.mtu6 = dev->mtu;
353 ndev->cnf.sysctl = NULL;
354 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
355 if (ndev->nd_parms == NULL) {
356 kfree(ndev);
357 return NULL;
358 }
359 if (ndev->cnf.forwarding)
360 dev_disable_lro(dev);
361 /* We refer to the device */
362 dev_hold(dev);
363
364 if (snmp6_alloc_dev(ndev) < 0) {
365 ADBG((KERN_WARNING
366 "%s(): cannot allocate memory for statistics; dev=%s.\n",
367 __func__, dev->name));
368 neigh_parms_release(&nd_tbl, ndev->nd_parms);
369 ndev->dead = 1;
370 in6_dev_finish_destroy(ndev);
371 return NULL;
372 }
373
374 if (snmp6_register_dev(ndev) < 0) {
375 ADBG((KERN_WARNING
376 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
377 __func__, dev->name));
378 neigh_parms_release(&nd_tbl, ndev->nd_parms);
379 ndev->dead = 1;
380 in6_dev_finish_destroy(ndev);
381 return NULL;
382 }
383
384 /* One reference from device. We must do this before
385 * we invoke __ipv6_regen_rndid().
386 */
387 in6_dev_hold(ndev);
388
389 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
390 ndev->cnf.accept_dad = -1;
391
392 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
393 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
394 printk(KERN_INFO
395 "%s: Disabled Multicast RS\n",
396 dev->name);
397 ndev->cnf.rtr_solicits = 0;
398 }
399 #endif
400
401 #ifdef CONFIG_IPV6_PRIVACY
402 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
403 if ((dev->flags&IFF_LOOPBACK) ||
404 dev->type == ARPHRD_TUNNEL ||
405 dev->type == ARPHRD_TUNNEL6 ||
406 dev->type == ARPHRD_SIT ||
407 dev->type == ARPHRD_NONE) {
408 printk(KERN_INFO
409 "%s: Disabled Privacy Extensions\n",
410 dev->name);
411 ndev->cnf.use_tempaddr = -1;
412 } else {
413 in6_dev_hold(ndev);
414 ipv6_regen_rndid((unsigned long) ndev);
415 }
416 #endif
417
418 if (netif_running(dev) && addrconf_qdisc_ok(dev))
419 ndev->if_flags |= IF_READY;
420
421 ipv6_mc_init_dev(ndev);
422 ndev->tstamp = jiffies;
423 addrconf_sysctl_register(ndev);
424 /* protected by rtnl_lock */
425 rcu_assign_pointer(dev->ip6_ptr, ndev);
426
427 /* Join all-node multicast group */
428 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
429
430 return ndev;
431 }
432
433 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
434 {
435 struct inet6_dev *idev;
436
437 ASSERT_RTNL();
438
439 if ((idev = __in6_dev_get(dev)) == NULL) {
440 if ((idev = ipv6_add_dev(dev)) == NULL)
441 return NULL;
442 }
443
444 if (dev->flags&IFF_UP)
445 ipv6_mc_up(idev);
446 return idev;
447 }
448
449 #ifdef CONFIG_SYSCTL
450 static void dev_forward_change(struct inet6_dev *idev)
451 {
452 struct net_device *dev;
453 struct inet6_ifaddr *ifa;
454
455 if (!idev)
456 return;
457 dev = idev->dev;
458 if (idev->cnf.forwarding)
459 dev_disable_lro(dev);
460 if (dev && (dev->flags & IFF_MULTICAST)) {
461 if (idev->cnf.forwarding)
462 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
463 else
464 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
465 }
466 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
467 if (ifa->flags&IFA_F_TENTATIVE)
468 continue;
469 if (idev->cnf.forwarding)
470 addrconf_join_anycast(ifa);
471 else
472 addrconf_leave_anycast(ifa);
473 }
474 }
475
476
477 static void addrconf_forward_change(struct net *net, __s32 newf)
478 {
479 struct net_device *dev;
480 struct inet6_dev *idev;
481
482 read_lock(&dev_base_lock);
483 for_each_netdev(net, dev) {
484 rcu_read_lock();
485 idev = __in6_dev_get(dev);
486 if (idev) {
487 int changed = (!idev->cnf.forwarding) ^ (!newf);
488 idev->cnf.forwarding = newf;
489 if (changed)
490 dev_forward_change(idev);
491 }
492 rcu_read_unlock();
493 }
494 read_unlock(&dev_base_lock);
495 }
496
497 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
498 {
499 struct net *net;
500
501 net = (struct net *)table->extra2;
502 if (p == &net->ipv6.devconf_dflt->forwarding)
503 return 0;
504
505 if (!rtnl_trylock())
506 return restart_syscall();
507
508 if (p == &net->ipv6.devconf_all->forwarding) {
509 __s32 newf = net->ipv6.devconf_all->forwarding;
510 net->ipv6.devconf_dflt->forwarding = newf;
511 addrconf_forward_change(net, newf);
512 } else if ((!*p) ^ (!old))
513 dev_forward_change((struct inet6_dev *)table->extra1);
514 rtnl_unlock();
515
516 if (*p)
517 rt6_purge_dflt_routers(net);
518 return 1;
519 }
520 #endif
521
522 /* Nobody refers to this ifaddr, destroy it */
523
524 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
525 {
526 WARN_ON(ifp->if_next != NULL);
527 WARN_ON(ifp->lst_next != NULL);
528
529 #ifdef NET_REFCNT_DEBUG
530 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
531 #endif
532
533 in6_dev_put(ifp->idev);
534
535 if (del_timer(&ifp->timer))
536 printk("Timer is still running, when freeing ifa=%p\n", ifp);
537
538 if (!ifp->dead) {
539 printk("Freeing alive inet6 address %p\n", ifp);
540 return;
541 }
542 dst_release(&ifp->rt->u.dst);
543
544 kfree(ifp);
545 }
546
547 static void
548 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
549 {
550 struct inet6_ifaddr *ifa, **ifap;
551 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
552
553 /*
554 * Each device address list is sorted in order of scope -
555 * global before linklocal.
556 */
557 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
558 ifap = &ifa->if_next) {
559 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
560 break;
561 }
562
563 ifp->if_next = *ifap;
564 *ifap = ifp;
565 }
566
567 /*
568 * Hash function taken from net_alias.c
569 */
570 static u8 ipv6_addr_hash(const struct in6_addr *addr)
571 {
572 __u32 word;
573
574 /*
575 * We perform the hash function over the last 64 bits of the address
576 * This will include the IEEE address token on links that support it.
577 */
578
579 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
580 word ^= (word >> 16);
581 word ^= (word >> 8);
582
583 return ((word ^ (word >> 4)) & 0x0f);
584 }
585
586 /* On success it returns ifp with increased reference count */
587
588 static struct inet6_ifaddr *
589 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
590 int scope, u32 flags)
591 {
592 struct inet6_ifaddr *ifa = NULL;
593 struct rt6_info *rt;
594 int hash;
595 int err = 0;
596 int addr_type = ipv6_addr_type(addr);
597
598 if (addr_type == IPV6_ADDR_ANY ||
599 addr_type & IPV6_ADDR_MULTICAST ||
600 (!(idev->dev->flags & IFF_LOOPBACK) &&
601 addr_type & IPV6_ADDR_LOOPBACK))
602 return ERR_PTR(-EADDRNOTAVAIL);
603
604 rcu_read_lock_bh();
605 if (idev->dead) {
606 err = -ENODEV; /*XXX*/
607 goto out2;
608 }
609
610 if (idev->cnf.disable_ipv6) {
611 err = -EACCES;
612 goto out2;
613 }
614
615 write_lock(&addrconf_hash_lock);
616
617 /* Ignore adding duplicate addresses on an interface */
618 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
619 ADBG(("ipv6_add_addr: already assigned\n"));
620 err = -EEXIST;
621 goto out;
622 }
623
624 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
625
626 if (ifa == NULL) {
627 ADBG(("ipv6_add_addr: malloc failed\n"));
628 err = -ENOBUFS;
629 goto out;
630 }
631
632 rt = addrconf_dst_alloc(idev, addr, 0);
633 if (IS_ERR(rt)) {
634 err = PTR_ERR(rt);
635 goto out;
636 }
637
638 ipv6_addr_copy(&ifa->addr, addr);
639
640 spin_lock_init(&ifa->lock);
641 init_timer(&ifa->timer);
642 ifa->timer.data = (unsigned long) ifa;
643 ifa->scope = scope;
644 ifa->prefix_len = pfxlen;
645 ifa->flags = flags | IFA_F_TENTATIVE;
646 ifa->cstamp = ifa->tstamp = jiffies;
647
648 ifa->rt = rt;
649
650 /*
651 * part one of RFC 4429, section 3.3
652 * We should not configure an address as
653 * optimistic if we do not yet know the link
654 * layer address of our nexhop router
655 */
656
657 if (rt->rt6i_nexthop == NULL)
658 ifa->flags &= ~IFA_F_OPTIMISTIC;
659
660 ifa->idev = idev;
661 in6_dev_hold(idev);
662 /* For caller */
663 in6_ifa_hold(ifa);
664
665 /* Add to big hash table */
666 hash = ipv6_addr_hash(addr);
667
668 ifa->lst_next = inet6_addr_lst[hash];
669 inet6_addr_lst[hash] = ifa;
670 in6_ifa_hold(ifa);
671 write_unlock(&addrconf_hash_lock);
672
673 write_lock(&idev->lock);
674 /* Add to inet6_dev unicast addr list. */
675 ipv6_link_dev_addr(idev, ifa);
676
677 #ifdef CONFIG_IPV6_PRIVACY
678 if (ifa->flags&IFA_F_TEMPORARY) {
679 ifa->tmp_next = idev->tempaddr_list;
680 idev->tempaddr_list = ifa;
681 in6_ifa_hold(ifa);
682 }
683 #endif
684
685 in6_ifa_hold(ifa);
686 write_unlock(&idev->lock);
687 out2:
688 rcu_read_unlock_bh();
689
690 if (likely(err == 0))
691 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
692 else {
693 kfree(ifa);
694 ifa = ERR_PTR(err);
695 }
696
697 return ifa;
698 out:
699 write_unlock(&addrconf_hash_lock);
700 goto out2;
701 }
702
703 /* This function wants to get referenced ifp and releases it before return */
704
705 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
706 {
707 struct inet6_ifaddr *ifa, **ifap;
708 struct inet6_dev *idev = ifp->idev;
709 int hash;
710 int deleted = 0, onlink = 0;
711 unsigned long expires = jiffies;
712
713 hash = ipv6_addr_hash(&ifp->addr);
714
715 ifp->dead = 1;
716
717 write_lock_bh(&addrconf_hash_lock);
718 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
719 ifap = &ifa->lst_next) {
720 if (ifa == ifp) {
721 *ifap = ifa->lst_next;
722 __in6_ifa_put(ifp);
723 ifa->lst_next = NULL;
724 break;
725 }
726 }
727 write_unlock_bh(&addrconf_hash_lock);
728
729 write_lock_bh(&idev->lock);
730 #ifdef CONFIG_IPV6_PRIVACY
731 if (ifp->flags&IFA_F_TEMPORARY) {
732 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
733 ifap = &ifa->tmp_next) {
734 if (ifa == ifp) {
735 *ifap = ifa->tmp_next;
736 if (ifp->ifpub) {
737 in6_ifa_put(ifp->ifpub);
738 ifp->ifpub = NULL;
739 }
740 __in6_ifa_put(ifp);
741 ifa->tmp_next = NULL;
742 break;
743 }
744 }
745 }
746 #endif
747
748 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
749 if (ifa == ifp) {
750 *ifap = ifa->if_next;
751 __in6_ifa_put(ifp);
752 ifa->if_next = NULL;
753 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
754 break;
755 deleted = 1;
756 continue;
757 } else if (ifp->flags & IFA_F_PERMANENT) {
758 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
759 ifp->prefix_len)) {
760 if (ifa->flags & IFA_F_PERMANENT) {
761 onlink = 1;
762 if (deleted)
763 break;
764 } else {
765 unsigned long lifetime;
766
767 if (!onlink)
768 onlink = -1;
769
770 spin_lock(&ifa->lock);
771
772 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
773 /*
774 * Note: Because this address is
775 * not permanent, lifetime <
776 * LONG_MAX / HZ here.
777 */
778 if (time_before(expires,
779 ifa->tstamp + lifetime * HZ))
780 expires = ifa->tstamp + lifetime * HZ;
781 spin_unlock(&ifa->lock);
782 }
783 }
784 }
785 ifap = &ifa->if_next;
786 }
787 write_unlock_bh(&idev->lock);
788
789 addrconf_del_timer(ifp);
790
791 ipv6_ifa_notify(RTM_DELADDR, ifp);
792
793 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
794
795 /*
796 * Purge or update corresponding prefix
797 *
798 * 1) we don't purge prefix here if address was not permanent.
799 * prefix is managed by its own lifetime.
800 * 2) if there're no addresses, delete prefix.
801 * 3) if there're still other permanent address(es),
802 * corresponding prefix is still permanent.
803 * 4) otherwise, update prefix lifetime to the
804 * longest valid lifetime among the corresponding
805 * addresses on the device.
806 * Note: subsequent RA will update lifetime.
807 *
808 * --yoshfuji
809 */
810 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
811 struct in6_addr prefix;
812 struct rt6_info *rt;
813 struct net *net = dev_net(ifp->idev->dev);
814 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
815 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
816
817 if (rt && addrconf_is_prefix_route(rt)) {
818 if (onlink == 0) {
819 ip6_del_rt(rt);
820 rt = NULL;
821 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
822 rt->rt6i_expires = expires;
823 rt->rt6i_flags |= RTF_EXPIRES;
824 }
825 }
826 dst_release(&rt->u.dst);
827 }
828
829 in6_ifa_put(ifp);
830 }
831
832 #ifdef CONFIG_IPV6_PRIVACY
833 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
834 {
835 struct inet6_dev *idev = ifp->idev;
836 struct in6_addr addr, *tmpaddr;
837 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
838 unsigned long regen_advance;
839 int tmp_plen;
840 int ret = 0;
841 int max_addresses;
842 u32 addr_flags;
843
844 write_lock(&idev->lock);
845 if (ift) {
846 spin_lock_bh(&ift->lock);
847 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
848 spin_unlock_bh(&ift->lock);
849 tmpaddr = &addr;
850 } else {
851 tmpaddr = NULL;
852 }
853 retry:
854 in6_dev_hold(idev);
855 if (idev->cnf.use_tempaddr <= 0) {
856 write_unlock(&idev->lock);
857 printk(KERN_INFO
858 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
859 in6_dev_put(idev);
860 ret = -1;
861 goto out;
862 }
863 spin_lock_bh(&ifp->lock);
864 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
865 idev->cnf.use_tempaddr = -1; /*XXX*/
866 spin_unlock_bh(&ifp->lock);
867 write_unlock(&idev->lock);
868 printk(KERN_WARNING
869 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
870 in6_dev_put(idev);
871 ret = -1;
872 goto out;
873 }
874 in6_ifa_hold(ifp);
875 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
876 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
877 spin_unlock_bh(&ifp->lock);
878 write_unlock(&idev->lock);
879 printk(KERN_WARNING
880 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
881 in6_ifa_put(ifp);
882 in6_dev_put(idev);
883 ret = -1;
884 goto out;
885 }
886 memcpy(&addr.s6_addr[8], idev->rndid, 8);
887 tmp_valid_lft = min_t(__u32,
888 ifp->valid_lft,
889 idev->cnf.temp_valid_lft);
890 tmp_prefered_lft = min_t(__u32,
891 ifp->prefered_lft,
892 idev->cnf.temp_prefered_lft - desync_factor / HZ);
893 tmp_plen = ifp->prefix_len;
894 max_addresses = idev->cnf.max_addresses;
895 tmp_cstamp = ifp->cstamp;
896 tmp_tstamp = ifp->tstamp;
897 spin_unlock_bh(&ifp->lock);
898
899 regen_advance = idev->cnf.regen_max_retry *
900 idev->cnf.dad_transmits *
901 idev->nd_parms->retrans_time / HZ;
902 write_unlock(&idev->lock);
903
904 /* A temporary address is created only if this calculated Preferred
905 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
906 * an implementation must not create a temporary address with a zero
907 * Preferred Lifetime.
908 */
909 if (tmp_prefered_lft <= regen_advance) {
910 in6_ifa_put(ifp);
911 in6_dev_put(idev);
912 ret = -1;
913 goto out;
914 }
915
916 addr_flags = IFA_F_TEMPORARY;
917 /* set in addrconf_prefix_rcv() */
918 if (ifp->flags & IFA_F_OPTIMISTIC)
919 addr_flags |= IFA_F_OPTIMISTIC;
920
921 ift = !max_addresses ||
922 ipv6_count_addresses(idev) < max_addresses ?
923 ipv6_add_addr(idev, &addr, tmp_plen,
924 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
925 addr_flags) : NULL;
926 if (!ift || IS_ERR(ift)) {
927 in6_ifa_put(ifp);
928 in6_dev_put(idev);
929 printk(KERN_INFO
930 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
931 tmpaddr = &addr;
932 write_lock(&idev->lock);
933 goto retry;
934 }
935
936 spin_lock_bh(&ift->lock);
937 ift->ifpub = ifp;
938 ift->valid_lft = tmp_valid_lft;
939 ift->prefered_lft = tmp_prefered_lft;
940 ift->cstamp = tmp_cstamp;
941 ift->tstamp = tmp_tstamp;
942 spin_unlock_bh(&ift->lock);
943
944 addrconf_dad_start(ift, 0);
945 in6_ifa_put(ift);
946 in6_dev_put(idev);
947 out:
948 return ret;
949 }
950 #endif
951
952 /*
953 * Choose an appropriate source address (RFC3484)
954 */
955 enum {
956 IPV6_SADDR_RULE_INIT = 0,
957 IPV6_SADDR_RULE_LOCAL,
958 IPV6_SADDR_RULE_SCOPE,
959 IPV6_SADDR_RULE_PREFERRED,
960 #ifdef CONFIG_IPV6_MIP6
961 IPV6_SADDR_RULE_HOA,
962 #endif
963 IPV6_SADDR_RULE_OIF,
964 IPV6_SADDR_RULE_LABEL,
965 #ifdef CONFIG_IPV6_PRIVACY
966 IPV6_SADDR_RULE_PRIVACY,
967 #endif
968 IPV6_SADDR_RULE_ORCHID,
969 IPV6_SADDR_RULE_PREFIX,
970 IPV6_SADDR_RULE_MAX
971 };
972
973 struct ipv6_saddr_score {
974 int rule;
975 int addr_type;
976 struct inet6_ifaddr *ifa;
977 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
978 int scopedist;
979 int matchlen;
980 };
981
982 struct ipv6_saddr_dst {
983 const struct in6_addr *addr;
984 int ifindex;
985 int scope;
986 int label;
987 unsigned int prefs;
988 };
989
990 static inline int ipv6_saddr_preferred(int type)
991 {
992 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
993 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
994 return 1;
995 return 0;
996 }
997
998 static int ipv6_get_saddr_eval(struct net *net,
999 struct ipv6_saddr_score *score,
1000 struct ipv6_saddr_dst *dst,
1001 int i)
1002 {
1003 int ret;
1004
1005 if (i <= score->rule) {
1006 switch (i) {
1007 case IPV6_SADDR_RULE_SCOPE:
1008 ret = score->scopedist;
1009 break;
1010 case IPV6_SADDR_RULE_PREFIX:
1011 ret = score->matchlen;
1012 break;
1013 default:
1014 ret = !!test_bit(i, score->scorebits);
1015 }
1016 goto out;
1017 }
1018
1019 switch (i) {
1020 case IPV6_SADDR_RULE_INIT:
1021 /* Rule 0: remember if hiscore is not ready yet */
1022 ret = !!score->ifa;
1023 break;
1024 case IPV6_SADDR_RULE_LOCAL:
1025 /* Rule 1: Prefer same address */
1026 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1027 break;
1028 case IPV6_SADDR_RULE_SCOPE:
1029 /* Rule 2: Prefer appropriate scope
1030 *
1031 * ret
1032 * ^
1033 * -1 | d 15
1034 * ---+--+-+---> scope
1035 * |
1036 * | d is scope of the destination.
1037 * B-d | \
1038 * | \ <- smaller scope is better if
1039 * B-15 | \ if scope is enough for destinaion.
1040 * | ret = B - scope (-1 <= scope >= d <= 15).
1041 * d-C-1 | /
1042 * |/ <- greater is better
1043 * -C / if scope is not enough for destination.
1044 * /| ret = scope - C (-1 <= d < scope <= 15).
1045 *
1046 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1047 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1048 * Assume B = 0 and we get C > 29.
1049 */
1050 ret = __ipv6_addr_src_scope(score->addr_type);
1051 if (ret >= dst->scope)
1052 ret = -ret;
1053 else
1054 ret -= 128; /* 30 is enough */
1055 score->scopedist = ret;
1056 break;
1057 case IPV6_SADDR_RULE_PREFERRED:
1058 /* Rule 3: Avoid deprecated and optimistic addresses */
1059 ret = ipv6_saddr_preferred(score->addr_type) ||
1060 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1061 break;
1062 #ifdef CONFIG_IPV6_MIP6
1063 case IPV6_SADDR_RULE_HOA:
1064 {
1065 /* Rule 4: Prefer home address */
1066 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1067 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1068 break;
1069 }
1070 #endif
1071 case IPV6_SADDR_RULE_OIF:
1072 /* Rule 5: Prefer outgoing interface */
1073 ret = (!dst->ifindex ||
1074 dst->ifindex == score->ifa->idev->dev->ifindex);
1075 break;
1076 case IPV6_SADDR_RULE_LABEL:
1077 /* Rule 6: Prefer matching label */
1078 ret = ipv6_addr_label(net,
1079 &score->ifa->addr, score->addr_type,
1080 score->ifa->idev->dev->ifindex) == dst->label;
1081 break;
1082 #ifdef CONFIG_IPV6_PRIVACY
1083 case IPV6_SADDR_RULE_PRIVACY:
1084 {
1085 /* Rule 7: Prefer public address
1086 * Note: prefer temprary address if use_tempaddr >= 2
1087 */
1088 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1089 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1090 score->ifa->idev->cnf.use_tempaddr >= 2;
1091 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1092 break;
1093 }
1094 #endif
1095 case IPV6_SADDR_RULE_ORCHID:
1096 /* Rule 8-: Prefer ORCHID vs ORCHID or
1097 * non-ORCHID vs non-ORCHID
1098 */
1099 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1100 ipv6_addr_orchid(dst->addr));
1101 break;
1102 case IPV6_SADDR_RULE_PREFIX:
1103 /* Rule 8: Use longest matching prefix */
1104 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1105 dst->addr);
1106 break;
1107 default:
1108 ret = 0;
1109 }
1110
1111 if (ret)
1112 __set_bit(i, score->scorebits);
1113 score->rule = i;
1114 out:
1115 return ret;
1116 }
1117
1118 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1119 const struct in6_addr *daddr, unsigned int prefs,
1120 struct in6_addr *saddr)
1121 {
1122 struct ipv6_saddr_score scores[2],
1123 *score = &scores[0], *hiscore = &scores[1];
1124 struct ipv6_saddr_dst dst;
1125 struct net_device *dev;
1126 int dst_type;
1127
1128 dst_type = __ipv6_addr_type(daddr);
1129 dst.addr = daddr;
1130 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1131 dst.scope = __ipv6_addr_src_scope(dst_type);
1132 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1133 dst.prefs = prefs;
1134
1135 hiscore->rule = -1;
1136 hiscore->ifa = NULL;
1137
1138 read_lock(&dev_base_lock);
1139 rcu_read_lock();
1140
1141 for_each_netdev(net, dev) {
1142 struct inet6_dev *idev;
1143
1144 /* Candidate Source Address (section 4)
1145 * - multicast and link-local destination address,
1146 * the set of candidate source address MUST only
1147 * include addresses assigned to interfaces
1148 * belonging to the same link as the outgoing
1149 * interface.
1150 * (- For site-local destination addresses, the
1151 * set of candidate source addresses MUST only
1152 * include addresses assigned to interfaces
1153 * belonging to the same site as the outgoing
1154 * interface.)
1155 */
1156 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1157 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1158 dst.ifindex && dev->ifindex != dst.ifindex)
1159 continue;
1160
1161 idev = __in6_dev_get(dev);
1162 if (!idev)
1163 continue;
1164
1165 read_lock_bh(&idev->lock);
1166 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1167 int i;
1168
1169 /*
1170 * - Tentative Address (RFC2462 section 5.4)
1171 * - A tentative address is not considered
1172 * "assigned to an interface" in the traditional
1173 * sense, unless it is also flagged as optimistic.
1174 * - Candidate Source Address (section 4)
1175 * - In any case, anycast addresses, multicast
1176 * addresses, and the unspecified address MUST
1177 * NOT be included in a candidate set.
1178 */
1179 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1180 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1181 continue;
1182
1183 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1184
1185 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1186 score->addr_type & IPV6_ADDR_MULTICAST)) {
1187 LIMIT_NETDEBUG(KERN_DEBUG
1188 "ADDRCONF: unspecified / multicast address "
1189 "assigned as unicast address on %s",
1190 dev->name);
1191 continue;
1192 }
1193
1194 score->rule = -1;
1195 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1196
1197 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1198 int minihiscore, miniscore;
1199
1200 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1201 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1202
1203 if (minihiscore > miniscore) {
1204 if (i == IPV6_SADDR_RULE_SCOPE &&
1205 score->scopedist > 0) {
1206 /*
1207 * special case:
1208 * each remaining entry
1209 * has too small (not enough)
1210 * scope, because ifa entries
1211 * are sorted by their scope
1212 * values.
1213 */
1214 goto try_nextdev;
1215 }
1216 break;
1217 } else if (minihiscore < miniscore) {
1218 if (hiscore->ifa)
1219 in6_ifa_put(hiscore->ifa);
1220
1221 in6_ifa_hold(score->ifa);
1222
1223 swap(hiscore, score);
1224
1225 /* restore our iterator */
1226 score->ifa = hiscore->ifa;
1227
1228 break;
1229 }
1230 }
1231 }
1232 try_nextdev:
1233 read_unlock_bh(&idev->lock);
1234 }
1235 rcu_read_unlock();
1236 read_unlock(&dev_base_lock);
1237
1238 if (!hiscore->ifa)
1239 return -EADDRNOTAVAIL;
1240
1241 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1242 in6_ifa_put(hiscore->ifa);
1243 return 0;
1244 }
1245
1246 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1247
1248 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1249 unsigned char banned_flags)
1250 {
1251 struct inet6_dev *idev;
1252 int err = -EADDRNOTAVAIL;
1253
1254 rcu_read_lock();
1255 if ((idev = __in6_dev_get(dev)) != NULL) {
1256 struct inet6_ifaddr *ifp;
1257
1258 read_lock_bh(&idev->lock);
1259 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1260 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1261 ipv6_addr_copy(addr, &ifp->addr);
1262 err = 0;
1263 break;
1264 }
1265 }
1266 read_unlock_bh(&idev->lock);
1267 }
1268 rcu_read_unlock();
1269 return err;
1270 }
1271
1272 static int ipv6_count_addresses(struct inet6_dev *idev)
1273 {
1274 int cnt = 0;
1275 struct inet6_ifaddr *ifp;
1276
1277 read_lock_bh(&idev->lock);
1278 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1279 cnt++;
1280 read_unlock_bh(&idev->lock);
1281 return cnt;
1282 }
1283
1284 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1285 struct net_device *dev, int strict)
1286 {
1287 struct inet6_ifaddr * ifp;
1288 u8 hash = ipv6_addr_hash(addr);
1289
1290 read_lock_bh(&addrconf_hash_lock);
1291 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1292 if (!net_eq(dev_net(ifp->idev->dev), net))
1293 continue;
1294 if (ipv6_addr_equal(&ifp->addr, addr) &&
1295 !(ifp->flags&IFA_F_TENTATIVE)) {
1296 if (dev == NULL || ifp->idev->dev == dev ||
1297 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1298 break;
1299 }
1300 }
1301 read_unlock_bh(&addrconf_hash_lock);
1302 return ifp != NULL;
1303 }
1304 EXPORT_SYMBOL(ipv6_chk_addr);
1305
1306 static
1307 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1308 struct net_device *dev)
1309 {
1310 struct inet6_ifaddr * ifp;
1311 u8 hash = ipv6_addr_hash(addr);
1312
1313 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1314 if (!net_eq(dev_net(ifp->idev->dev), net))
1315 continue;
1316 if (ipv6_addr_equal(&ifp->addr, addr)) {
1317 if (dev == NULL || ifp->idev->dev == dev)
1318 break;
1319 }
1320 }
1321 return ifp != NULL;
1322 }
1323
1324 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1325 {
1326 struct inet6_dev *idev;
1327 struct inet6_ifaddr *ifa;
1328 int onlink;
1329
1330 onlink = 0;
1331 rcu_read_lock();
1332 idev = __in6_dev_get(dev);
1333 if (idev) {
1334 read_lock_bh(&idev->lock);
1335 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1336 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1337 ifa->prefix_len);
1338 if (onlink)
1339 break;
1340 }
1341 read_unlock_bh(&idev->lock);
1342 }
1343 rcu_read_unlock();
1344 return onlink;
1345 }
1346
1347 EXPORT_SYMBOL(ipv6_chk_prefix);
1348
1349 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1350 struct net_device *dev, int strict)
1351 {
1352 struct inet6_ifaddr * ifp;
1353 u8 hash = ipv6_addr_hash(addr);
1354
1355 read_lock_bh(&addrconf_hash_lock);
1356 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1357 if (!net_eq(dev_net(ifp->idev->dev), net))
1358 continue;
1359 if (ipv6_addr_equal(&ifp->addr, addr)) {
1360 if (dev == NULL || ifp->idev->dev == dev ||
1361 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1362 in6_ifa_hold(ifp);
1363 break;
1364 }
1365 }
1366 }
1367 read_unlock_bh(&addrconf_hash_lock);
1368
1369 return ifp;
1370 }
1371
1372 /* Gets referenced address, destroys ifaddr */
1373
1374 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1375 {
1376 if (ifp->flags&IFA_F_PERMANENT) {
1377 spin_lock_bh(&ifp->lock);
1378 addrconf_del_timer(ifp);
1379 ifp->flags |= IFA_F_TENTATIVE;
1380 spin_unlock_bh(&ifp->lock);
1381 in6_ifa_put(ifp);
1382 #ifdef CONFIG_IPV6_PRIVACY
1383 } else if (ifp->flags&IFA_F_TEMPORARY) {
1384 struct inet6_ifaddr *ifpub;
1385 spin_lock_bh(&ifp->lock);
1386 ifpub = ifp->ifpub;
1387 if (ifpub) {
1388 in6_ifa_hold(ifpub);
1389 spin_unlock_bh(&ifp->lock);
1390 ipv6_create_tempaddr(ifpub, ifp);
1391 in6_ifa_put(ifpub);
1392 } else {
1393 spin_unlock_bh(&ifp->lock);
1394 }
1395 ipv6_del_addr(ifp);
1396 #endif
1397 } else
1398 ipv6_del_addr(ifp);
1399 }
1400
1401 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1402 {
1403 struct inet6_dev *idev = ifp->idev;
1404
1405 if (net_ratelimit())
1406 printk(KERN_INFO "%s: IPv6 duplicate address detected!\n",
1407 ifp->idev->dev->name);
1408
1409 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1410 struct in6_addr addr;
1411
1412 addr.s6_addr32[0] = htonl(0xfe800000);
1413 addr.s6_addr32[1] = 0;
1414
1415 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1416 ipv6_addr_equal(&ifp->addr, &addr)) {
1417 /* DAD failed for link-local based on MAC address */
1418 idev->cnf.disable_ipv6 = 1;
1419
1420 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1421 ifp->idev->dev->name);
1422 }
1423 }
1424
1425 addrconf_dad_stop(ifp);
1426 }
1427
1428 /* Join to solicited addr multicast group. */
1429
1430 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1431 {
1432 struct in6_addr maddr;
1433
1434 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1435 return;
1436
1437 addrconf_addr_solict_mult(addr, &maddr);
1438 ipv6_dev_mc_inc(dev, &maddr);
1439 }
1440
1441 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1442 {
1443 struct in6_addr maddr;
1444
1445 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1446 return;
1447
1448 addrconf_addr_solict_mult(addr, &maddr);
1449 __ipv6_dev_mc_dec(idev, &maddr);
1450 }
1451
1452 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1453 {
1454 struct in6_addr addr;
1455 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1456 if (ipv6_addr_any(&addr))
1457 return;
1458 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1459 }
1460
1461 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1462 {
1463 struct in6_addr addr;
1464 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1465 if (ipv6_addr_any(&addr))
1466 return;
1467 __ipv6_dev_ac_dec(ifp->idev, &addr);
1468 }
1469
1470 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1471 {
1472 if (dev->addr_len != ETH_ALEN)
1473 return -1;
1474 memcpy(eui, dev->dev_addr, 3);
1475 memcpy(eui + 5, dev->dev_addr + 3, 3);
1476
1477 /*
1478 * The zSeries OSA network cards can be shared among various
1479 * OS instances, but the OSA cards have only one MAC address.
1480 * This leads to duplicate address conflicts in conjunction
1481 * with IPv6 if more than one instance uses the same card.
1482 *
1483 * The driver for these cards can deliver a unique 16-bit
1484 * identifier for each instance sharing the same card. It is
1485 * placed instead of 0xFFFE in the interface identifier. The
1486 * "u" bit of the interface identifier is not inverted in this
1487 * case. Hence the resulting interface identifier has local
1488 * scope according to RFC2373.
1489 */
1490 if (dev->dev_id) {
1491 eui[3] = (dev->dev_id >> 8) & 0xFF;
1492 eui[4] = dev->dev_id & 0xFF;
1493 } else {
1494 eui[3] = 0xFF;
1495 eui[4] = 0xFE;
1496 eui[0] ^= 2;
1497 }
1498 return 0;
1499 }
1500
1501 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1502 {
1503 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1504 if (dev->addr_len != ARCNET_ALEN)
1505 return -1;
1506 memset(eui, 0, 7);
1507 eui[7] = *(u8*)dev->dev_addr;
1508 return 0;
1509 }
1510
1511 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1512 {
1513 if (dev->addr_len != INFINIBAND_ALEN)
1514 return -1;
1515 memcpy(eui, dev->dev_addr + 12, 8);
1516 eui[0] |= 2;
1517 return 0;
1518 }
1519
1520 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1521 {
1522 if (addr == 0)
1523 return -1;
1524 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1525 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1526 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1527 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1528 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1529 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1530 eui[1] = 0;
1531 eui[2] = 0x5E;
1532 eui[3] = 0xFE;
1533 memcpy(eui + 4, &addr, 4);
1534 return 0;
1535 }
1536 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1537
1538 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1539 {
1540 if (dev->priv_flags & IFF_ISATAP)
1541 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1542 return -1;
1543 }
1544
1545 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1546 {
1547 switch (dev->type) {
1548 case ARPHRD_ETHER:
1549 case ARPHRD_FDDI:
1550 case ARPHRD_IEEE802_TR:
1551 return addrconf_ifid_eui48(eui, dev);
1552 case ARPHRD_ARCNET:
1553 return addrconf_ifid_arcnet(eui, dev);
1554 case ARPHRD_INFINIBAND:
1555 return addrconf_ifid_infiniband(eui, dev);
1556 case ARPHRD_SIT:
1557 return addrconf_ifid_sit(eui, dev);
1558 }
1559 return -1;
1560 }
1561
1562 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1563 {
1564 int err = -1;
1565 struct inet6_ifaddr *ifp;
1566
1567 read_lock_bh(&idev->lock);
1568 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1569 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1570 memcpy(eui, ifp->addr.s6_addr+8, 8);
1571 err = 0;
1572 break;
1573 }
1574 }
1575 read_unlock_bh(&idev->lock);
1576 return err;
1577 }
1578
1579 #ifdef CONFIG_IPV6_PRIVACY
1580 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1581 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1582 {
1583 regen:
1584 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1585 idev->rndid[0] &= ~0x02;
1586
1587 /*
1588 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1589 * check if generated address is not inappropriate
1590 *
1591 * - Reserved subnet anycast (RFC 2526)
1592 * 11111101 11....11 1xxxxxxx
1593 * - ISATAP (RFC4214) 6.1
1594 * 00-00-5E-FE-xx-xx-xx-xx
1595 * - value 0
1596 * - XXX: already assigned to an address on the device
1597 */
1598 if (idev->rndid[0] == 0xfd &&
1599 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1600 (idev->rndid[7]&0x80))
1601 goto regen;
1602 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1603 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1604 goto regen;
1605 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1606 goto regen;
1607 }
1608
1609 return 0;
1610 }
1611
1612 static void ipv6_regen_rndid(unsigned long data)
1613 {
1614 struct inet6_dev *idev = (struct inet6_dev *) data;
1615 unsigned long expires;
1616
1617 rcu_read_lock_bh();
1618 write_lock_bh(&idev->lock);
1619
1620 if (idev->dead)
1621 goto out;
1622
1623 if (__ipv6_regen_rndid(idev) < 0)
1624 goto out;
1625
1626 expires = jiffies +
1627 idev->cnf.temp_prefered_lft * HZ -
1628 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1629 if (time_before(expires, jiffies)) {
1630 printk(KERN_WARNING
1631 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1632 idev->dev->name);
1633 goto out;
1634 }
1635
1636 if (!mod_timer(&idev->regen_timer, expires))
1637 in6_dev_hold(idev);
1638
1639 out:
1640 write_unlock_bh(&idev->lock);
1641 rcu_read_unlock_bh();
1642 in6_dev_put(idev);
1643 }
1644
1645 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1646 int ret = 0;
1647
1648 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1649 ret = __ipv6_regen_rndid(idev);
1650 return ret;
1651 }
1652 #endif
1653
1654 /*
1655 * Add prefix route.
1656 */
1657
1658 static void
1659 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1660 unsigned long expires, u32 flags)
1661 {
1662 struct fib6_config cfg = {
1663 .fc_table = RT6_TABLE_PREFIX,
1664 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1665 .fc_ifindex = dev->ifindex,
1666 .fc_expires = expires,
1667 .fc_dst_len = plen,
1668 .fc_flags = RTF_UP | flags,
1669 .fc_nlinfo.nl_net = dev_net(dev),
1670 .fc_protocol = RTPROT_KERNEL,
1671 };
1672
1673 ipv6_addr_copy(&cfg.fc_dst, pfx);
1674
1675 /* Prevent useless cloning on PtP SIT.
1676 This thing is done here expecting that the whole
1677 class of non-broadcast devices need not cloning.
1678 */
1679 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1680 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1681 cfg.fc_flags |= RTF_NONEXTHOP;
1682 #endif
1683
1684 ip6_route_add(&cfg);
1685 }
1686
1687 /* Create "default" multicast route to the interface */
1688
1689 static void addrconf_add_mroute(struct net_device *dev)
1690 {
1691 struct fib6_config cfg = {
1692 .fc_table = RT6_TABLE_LOCAL,
1693 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1694 .fc_ifindex = dev->ifindex,
1695 .fc_dst_len = 8,
1696 .fc_flags = RTF_UP,
1697 .fc_nlinfo.nl_net = dev_net(dev),
1698 };
1699
1700 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1701
1702 ip6_route_add(&cfg);
1703 }
1704
1705 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1706 static void sit_route_add(struct net_device *dev)
1707 {
1708 struct fib6_config cfg = {
1709 .fc_table = RT6_TABLE_MAIN,
1710 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1711 .fc_ifindex = dev->ifindex,
1712 .fc_dst_len = 96,
1713 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1714 .fc_nlinfo.nl_net = dev_net(dev),
1715 };
1716
1717 /* prefix length - 96 bits "::d.d.d.d" */
1718 ip6_route_add(&cfg);
1719 }
1720 #endif
1721
1722 static void addrconf_add_lroute(struct net_device *dev)
1723 {
1724 struct in6_addr addr;
1725
1726 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1727 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1728 }
1729
1730 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1731 {
1732 struct inet6_dev *idev;
1733
1734 ASSERT_RTNL();
1735
1736 if ((idev = ipv6_find_idev(dev)) == NULL)
1737 return NULL;
1738
1739 /* Add default multicast route */
1740 addrconf_add_mroute(dev);
1741
1742 /* Add link local route */
1743 addrconf_add_lroute(dev);
1744 return idev;
1745 }
1746
1747 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1748 {
1749 struct prefix_info *pinfo;
1750 __u32 valid_lft;
1751 __u32 prefered_lft;
1752 int addr_type;
1753 struct inet6_dev *in6_dev;
1754 struct net *net = dev_net(dev);
1755
1756 pinfo = (struct prefix_info *) opt;
1757
1758 if (len < sizeof(struct prefix_info)) {
1759 ADBG(("addrconf: prefix option too short\n"));
1760 return;
1761 }
1762
1763 /*
1764 * Validation checks ([ADDRCONF], page 19)
1765 */
1766
1767 addr_type = ipv6_addr_type(&pinfo->prefix);
1768
1769 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1770 return;
1771
1772 valid_lft = ntohl(pinfo->valid);
1773 prefered_lft = ntohl(pinfo->prefered);
1774
1775 if (prefered_lft > valid_lft) {
1776 if (net_ratelimit())
1777 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1778 return;
1779 }
1780
1781 in6_dev = in6_dev_get(dev);
1782
1783 if (in6_dev == NULL) {
1784 if (net_ratelimit())
1785 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1786 return;
1787 }
1788
1789 /*
1790 * Two things going on here:
1791 * 1) Add routes for on-link prefixes
1792 * 2) Configure prefixes with the auto flag set
1793 */
1794
1795 if (pinfo->onlink) {
1796 struct rt6_info *rt;
1797 unsigned long rt_expires;
1798
1799 /* Avoid arithmetic overflow. Really, we could
1800 * save rt_expires in seconds, likely valid_lft,
1801 * but it would require division in fib gc, that it
1802 * not good.
1803 */
1804 if (HZ > USER_HZ)
1805 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1806 else
1807 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1808
1809 if (addrconf_finite_timeout(rt_expires))
1810 rt_expires *= HZ;
1811
1812 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1813 dev->ifindex, 1);
1814
1815 if (rt && addrconf_is_prefix_route(rt)) {
1816 /* Autoconf prefix route */
1817 if (valid_lft == 0) {
1818 ip6_del_rt(rt);
1819 rt = NULL;
1820 } else if (addrconf_finite_timeout(rt_expires)) {
1821 /* not infinity */
1822 rt->rt6i_expires = jiffies + rt_expires;
1823 rt->rt6i_flags |= RTF_EXPIRES;
1824 } else {
1825 rt->rt6i_flags &= ~RTF_EXPIRES;
1826 rt->rt6i_expires = 0;
1827 }
1828 } else if (valid_lft) {
1829 clock_t expires = 0;
1830 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1831 if (addrconf_finite_timeout(rt_expires)) {
1832 /* not infinity */
1833 flags |= RTF_EXPIRES;
1834 expires = jiffies_to_clock_t(rt_expires);
1835 }
1836 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1837 dev, expires, flags);
1838 }
1839 if (rt)
1840 dst_release(&rt->u.dst);
1841 }
1842
1843 /* Try to figure out our local address for this prefix */
1844
1845 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1846 struct inet6_ifaddr * ifp;
1847 struct in6_addr addr;
1848 int create = 0, update_lft = 0;
1849
1850 if (pinfo->prefix_len == 64) {
1851 memcpy(&addr, &pinfo->prefix, 8);
1852 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1853 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1854 in6_dev_put(in6_dev);
1855 return;
1856 }
1857 goto ok;
1858 }
1859 if (net_ratelimit())
1860 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1861 pinfo->prefix_len);
1862 in6_dev_put(in6_dev);
1863 return;
1864
1865 ok:
1866
1867 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1868
1869 if (ifp == NULL && valid_lft) {
1870 int max_addresses = in6_dev->cnf.max_addresses;
1871 u32 addr_flags = 0;
1872
1873 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1874 if (in6_dev->cnf.optimistic_dad &&
1875 !net->ipv6.devconf_all->forwarding)
1876 addr_flags = IFA_F_OPTIMISTIC;
1877 #endif
1878
1879 /* Do not allow to create too much of autoconfigured
1880 * addresses; this would be too easy way to crash kernel.
1881 */
1882 if (!max_addresses ||
1883 ipv6_count_addresses(in6_dev) < max_addresses)
1884 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1885 addr_type&IPV6_ADDR_SCOPE_MASK,
1886 addr_flags);
1887
1888 if (!ifp || IS_ERR(ifp)) {
1889 in6_dev_put(in6_dev);
1890 return;
1891 }
1892
1893 update_lft = create = 1;
1894 ifp->cstamp = jiffies;
1895 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1896 }
1897
1898 if (ifp) {
1899 int flags;
1900 unsigned long now;
1901 #ifdef CONFIG_IPV6_PRIVACY
1902 struct inet6_ifaddr *ift;
1903 #endif
1904 u32 stored_lft;
1905
1906 /* update lifetime (RFC2462 5.5.3 e) */
1907 spin_lock(&ifp->lock);
1908 now = jiffies;
1909 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1910 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1911 else
1912 stored_lft = 0;
1913 if (!update_lft && stored_lft) {
1914 if (valid_lft > MIN_VALID_LIFETIME ||
1915 valid_lft > stored_lft)
1916 update_lft = 1;
1917 else if (stored_lft <= MIN_VALID_LIFETIME) {
1918 /* valid_lft <= stored_lft is always true */
1919 /*
1920 * RFC 4862 Section 5.5.3e:
1921 * "Note that the preferred lifetime of
1922 * the corresponding address is always
1923 * reset to the Preferred Lifetime in
1924 * the received Prefix Information
1925 * option, regardless of whether the
1926 * valid lifetime is also reset or
1927 * ignored."
1928 *
1929 * So if the preferred lifetime in
1930 * this advertisement is different
1931 * than what we have stored, but the
1932 * valid lifetime is invalid, just
1933 * reset prefered_lft.
1934 *
1935 * We must set the valid lifetime
1936 * to the stored lifetime since we'll
1937 * be updating the timestamp below,
1938 * else we'll set it back to the
1939 * minumum.
1940 */
1941 if (prefered_lft != ifp->prefered_lft) {
1942 valid_lft = stored_lft;
1943 update_lft = 1;
1944 }
1945 } else {
1946 valid_lft = MIN_VALID_LIFETIME;
1947 if (valid_lft < prefered_lft)
1948 prefered_lft = valid_lft;
1949 update_lft = 1;
1950 }
1951 }
1952
1953 if (update_lft) {
1954 ifp->valid_lft = valid_lft;
1955 ifp->prefered_lft = prefered_lft;
1956 ifp->tstamp = now;
1957 flags = ifp->flags;
1958 ifp->flags &= ~IFA_F_DEPRECATED;
1959 spin_unlock(&ifp->lock);
1960
1961 if (!(flags&IFA_F_TENTATIVE))
1962 ipv6_ifa_notify(0, ifp);
1963 } else
1964 spin_unlock(&ifp->lock);
1965
1966 #ifdef CONFIG_IPV6_PRIVACY
1967 read_lock_bh(&in6_dev->lock);
1968 /* update all temporary addresses in the list */
1969 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1970 /*
1971 * When adjusting the lifetimes of an existing
1972 * temporary address, only lower the lifetimes.
1973 * Implementations must not increase the
1974 * lifetimes of an existing temporary address
1975 * when processing a Prefix Information Option.
1976 */
1977 if (ifp != ift->ifpub)
1978 continue;
1979
1980 spin_lock(&ift->lock);
1981 flags = ift->flags;
1982 if (ift->valid_lft > valid_lft &&
1983 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1984 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1985 if (ift->prefered_lft > prefered_lft &&
1986 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1987 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1988 spin_unlock(&ift->lock);
1989 if (!(flags&IFA_F_TENTATIVE))
1990 ipv6_ifa_notify(0, ift);
1991 }
1992
1993 if (create && in6_dev->cnf.use_tempaddr > 0) {
1994 /*
1995 * When a new public address is created as described in [ADDRCONF],
1996 * also create a new temporary address.
1997 */
1998 read_unlock_bh(&in6_dev->lock);
1999 ipv6_create_tempaddr(ifp, NULL);
2000 } else {
2001 read_unlock_bh(&in6_dev->lock);
2002 }
2003 #endif
2004 in6_ifa_put(ifp);
2005 addrconf_verify(0);
2006 }
2007 }
2008 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2009 in6_dev_put(in6_dev);
2010 }
2011
2012 /*
2013 * Set destination address.
2014 * Special case for SIT interfaces where we create a new "virtual"
2015 * device.
2016 */
2017 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2018 {
2019 struct in6_ifreq ireq;
2020 struct net_device *dev;
2021 int err = -EINVAL;
2022
2023 rtnl_lock();
2024
2025 err = -EFAULT;
2026 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2027 goto err_exit;
2028
2029 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2030
2031 err = -ENODEV;
2032 if (dev == NULL)
2033 goto err_exit;
2034
2035 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2036 if (dev->type == ARPHRD_SIT) {
2037 const struct net_device_ops *ops = dev->netdev_ops;
2038 struct ifreq ifr;
2039 struct ip_tunnel_parm p;
2040
2041 err = -EADDRNOTAVAIL;
2042 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2043 goto err_exit;
2044
2045 memset(&p, 0, sizeof(p));
2046 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2047 p.iph.saddr = 0;
2048 p.iph.version = 4;
2049 p.iph.ihl = 5;
2050 p.iph.protocol = IPPROTO_IPV6;
2051 p.iph.ttl = 64;
2052 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2053
2054 if (ops->ndo_do_ioctl) {
2055 mm_segment_t oldfs = get_fs();
2056
2057 set_fs(KERNEL_DS);
2058 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2059 set_fs(oldfs);
2060 } else
2061 err = -EOPNOTSUPP;
2062
2063 if (err == 0) {
2064 err = -ENOBUFS;
2065 dev = __dev_get_by_name(net, p.name);
2066 if (!dev)
2067 goto err_exit;
2068 err = dev_open(dev);
2069 }
2070 }
2071 #endif
2072
2073 err_exit:
2074 rtnl_unlock();
2075 return err;
2076 }
2077
2078 /*
2079 * Manual configuration of address on an interface
2080 */
2081 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2082 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2083 __u32 valid_lft)
2084 {
2085 struct inet6_ifaddr *ifp;
2086 struct inet6_dev *idev;
2087 struct net_device *dev;
2088 int scope;
2089 u32 flags;
2090 clock_t expires;
2091 unsigned long timeout;
2092
2093 ASSERT_RTNL();
2094
2095 if (plen > 128)
2096 return -EINVAL;
2097
2098 /* check the lifetime */
2099 if (!valid_lft || prefered_lft > valid_lft)
2100 return -EINVAL;
2101
2102 dev = __dev_get_by_index(net, ifindex);
2103 if (!dev)
2104 return -ENODEV;
2105
2106 if ((idev = addrconf_add_dev(dev)) == NULL)
2107 return -ENOBUFS;
2108
2109 scope = ipv6_addr_scope(pfx);
2110
2111 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2112 if (addrconf_finite_timeout(timeout)) {
2113 expires = jiffies_to_clock_t(timeout * HZ);
2114 valid_lft = timeout;
2115 flags = RTF_EXPIRES;
2116 } else {
2117 expires = 0;
2118 flags = 0;
2119 ifa_flags |= IFA_F_PERMANENT;
2120 }
2121
2122 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2123 if (addrconf_finite_timeout(timeout)) {
2124 if (timeout == 0)
2125 ifa_flags |= IFA_F_DEPRECATED;
2126 prefered_lft = timeout;
2127 }
2128
2129 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2130
2131 if (!IS_ERR(ifp)) {
2132 spin_lock_bh(&ifp->lock);
2133 ifp->valid_lft = valid_lft;
2134 ifp->prefered_lft = prefered_lft;
2135 ifp->tstamp = jiffies;
2136 spin_unlock_bh(&ifp->lock);
2137
2138 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2139 expires, flags);
2140 /*
2141 * Note that section 3.1 of RFC 4429 indicates
2142 * that the Optimistic flag should not be set for
2143 * manually configured addresses
2144 */
2145 addrconf_dad_start(ifp, 0);
2146 in6_ifa_put(ifp);
2147 addrconf_verify(0);
2148 return 0;
2149 }
2150
2151 return PTR_ERR(ifp);
2152 }
2153
2154 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2155 unsigned int plen)
2156 {
2157 struct inet6_ifaddr *ifp;
2158 struct inet6_dev *idev;
2159 struct net_device *dev;
2160
2161 if (plen > 128)
2162 return -EINVAL;
2163
2164 dev = __dev_get_by_index(net, ifindex);
2165 if (!dev)
2166 return -ENODEV;
2167
2168 if ((idev = __in6_dev_get(dev)) == NULL)
2169 return -ENXIO;
2170
2171 read_lock_bh(&idev->lock);
2172 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2173 if (ifp->prefix_len == plen &&
2174 ipv6_addr_equal(pfx, &ifp->addr)) {
2175 in6_ifa_hold(ifp);
2176 read_unlock_bh(&idev->lock);
2177
2178 ipv6_del_addr(ifp);
2179
2180 /* If the last address is deleted administratively,
2181 disable IPv6 on this interface.
2182 */
2183 if (idev->addr_list == NULL)
2184 addrconf_ifdown(idev->dev, 1);
2185 return 0;
2186 }
2187 }
2188 read_unlock_bh(&idev->lock);
2189 return -EADDRNOTAVAIL;
2190 }
2191
2192
2193 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2194 {
2195 struct in6_ifreq ireq;
2196 int err;
2197
2198 if (!capable(CAP_NET_ADMIN))
2199 return -EPERM;
2200
2201 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2202 return -EFAULT;
2203
2204 rtnl_lock();
2205 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2206 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2207 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2208 rtnl_unlock();
2209 return err;
2210 }
2211
2212 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2213 {
2214 struct in6_ifreq ireq;
2215 int err;
2216
2217 if (!capable(CAP_NET_ADMIN))
2218 return -EPERM;
2219
2220 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2221 return -EFAULT;
2222
2223 rtnl_lock();
2224 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2225 ireq.ifr6_prefixlen);
2226 rtnl_unlock();
2227 return err;
2228 }
2229
2230 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2231 int plen, int scope)
2232 {
2233 struct inet6_ifaddr *ifp;
2234
2235 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2236 if (!IS_ERR(ifp)) {
2237 spin_lock_bh(&ifp->lock);
2238 ifp->flags &= ~IFA_F_TENTATIVE;
2239 spin_unlock_bh(&ifp->lock);
2240 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2241 in6_ifa_put(ifp);
2242 }
2243 }
2244
2245 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2246 static void sit_add_v4_addrs(struct inet6_dev *idev)
2247 {
2248 struct in6_addr addr;
2249 struct net_device *dev;
2250 struct net *net = dev_net(idev->dev);
2251 int scope;
2252
2253 ASSERT_RTNL();
2254
2255 memset(&addr, 0, sizeof(struct in6_addr));
2256 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2257
2258 if (idev->dev->flags&IFF_POINTOPOINT) {
2259 addr.s6_addr32[0] = htonl(0xfe800000);
2260 scope = IFA_LINK;
2261 } else {
2262 scope = IPV6_ADDR_COMPATv4;
2263 }
2264
2265 if (addr.s6_addr32[3]) {
2266 add_addr(idev, &addr, 128, scope);
2267 return;
2268 }
2269
2270 for_each_netdev(net, dev) {
2271 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2272 if (in_dev && (dev->flags & IFF_UP)) {
2273 struct in_ifaddr * ifa;
2274
2275 int flag = scope;
2276
2277 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2278 int plen;
2279
2280 addr.s6_addr32[3] = ifa->ifa_local;
2281
2282 if (ifa->ifa_scope == RT_SCOPE_LINK)
2283 continue;
2284 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2285 if (idev->dev->flags&IFF_POINTOPOINT)
2286 continue;
2287 flag |= IFA_HOST;
2288 }
2289 if (idev->dev->flags&IFF_POINTOPOINT)
2290 plen = 64;
2291 else
2292 plen = 96;
2293
2294 add_addr(idev, &addr, plen, flag);
2295 }
2296 }
2297 }
2298 }
2299 #endif
2300
2301 static void init_loopback(struct net_device *dev)
2302 {
2303 struct inet6_dev *idev;
2304
2305 /* ::1 */
2306
2307 ASSERT_RTNL();
2308
2309 if ((idev = ipv6_find_idev(dev)) == NULL) {
2310 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2311 return;
2312 }
2313
2314 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2315 }
2316
2317 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2318 {
2319 struct inet6_ifaddr * ifp;
2320 u32 addr_flags = IFA_F_PERMANENT;
2321
2322 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2323 if (idev->cnf.optimistic_dad &&
2324 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2325 addr_flags |= IFA_F_OPTIMISTIC;
2326 #endif
2327
2328
2329 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2330 if (!IS_ERR(ifp)) {
2331 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2332 addrconf_dad_start(ifp, 0);
2333 in6_ifa_put(ifp);
2334 }
2335 }
2336
2337 static void addrconf_dev_config(struct net_device *dev)
2338 {
2339 struct in6_addr addr;
2340 struct inet6_dev * idev;
2341
2342 ASSERT_RTNL();
2343
2344 if ((dev->type != ARPHRD_ETHER) &&
2345 (dev->type != ARPHRD_FDDI) &&
2346 (dev->type != ARPHRD_IEEE802_TR) &&
2347 (dev->type != ARPHRD_ARCNET) &&
2348 (dev->type != ARPHRD_INFINIBAND)) {
2349 /* Alas, we support only Ethernet autoconfiguration. */
2350 return;
2351 }
2352
2353 idev = addrconf_add_dev(dev);
2354 if (idev == NULL)
2355 return;
2356
2357 memset(&addr, 0, sizeof(struct in6_addr));
2358 addr.s6_addr32[0] = htonl(0xFE800000);
2359
2360 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2361 addrconf_add_linklocal(idev, &addr);
2362 }
2363
2364 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2365 static void addrconf_sit_config(struct net_device *dev)
2366 {
2367 struct inet6_dev *idev;
2368
2369 ASSERT_RTNL();
2370
2371 /*
2372 * Configure the tunnel with one of our IPv4
2373 * addresses... we should configure all of
2374 * our v4 addrs in the tunnel
2375 */
2376
2377 if ((idev = ipv6_find_idev(dev)) == NULL) {
2378 printk(KERN_DEBUG "init sit: add_dev failed\n");
2379 return;
2380 }
2381
2382 if (dev->priv_flags & IFF_ISATAP) {
2383 struct in6_addr addr;
2384
2385 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2386 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2387 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2388 addrconf_add_linklocal(idev, &addr);
2389 return;
2390 }
2391
2392 sit_add_v4_addrs(idev);
2393
2394 if (dev->flags&IFF_POINTOPOINT) {
2395 addrconf_add_mroute(dev);
2396 addrconf_add_lroute(dev);
2397 } else
2398 sit_route_add(dev);
2399 }
2400 #endif
2401
2402 static inline int
2403 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2404 {
2405 struct in6_addr lladdr;
2406
2407 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2408 addrconf_add_linklocal(idev, &lladdr);
2409 return 0;
2410 }
2411 return -1;
2412 }
2413
2414 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2415 {
2416 struct net_device *link_dev;
2417 struct net *net = dev_net(idev->dev);
2418
2419 /* first try to inherit the link-local address from the link device */
2420 if (idev->dev->iflink &&
2421 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2422 if (!ipv6_inherit_linklocal(idev, link_dev))
2423 return;
2424 }
2425 /* then try to inherit it from any device */
2426 for_each_netdev(net, link_dev) {
2427 if (!ipv6_inherit_linklocal(idev, link_dev))
2428 return;
2429 }
2430 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2431 }
2432
2433 /*
2434 * Autoconfigure tunnel with a link-local address so routing protocols,
2435 * DHCPv6, MLD etc. can be run over the virtual link
2436 */
2437
2438 static void addrconf_ip6_tnl_config(struct net_device *dev)
2439 {
2440 struct inet6_dev *idev;
2441
2442 ASSERT_RTNL();
2443
2444 if ((idev = addrconf_add_dev(dev)) == NULL) {
2445 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2446 return;
2447 }
2448 ip6_tnl_add_linklocal(idev);
2449 }
2450
2451 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2452 void * data)
2453 {
2454 struct net_device *dev = (struct net_device *) data;
2455 struct inet6_dev *idev = __in6_dev_get(dev);
2456 int run_pending = 0;
2457 int err;
2458
2459 switch(event) {
2460 case NETDEV_REGISTER:
2461 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2462 idev = ipv6_add_dev(dev);
2463 if (!idev)
2464 return notifier_from_errno(-ENOMEM);
2465 }
2466 break;
2467 case NETDEV_UP:
2468 case NETDEV_CHANGE:
2469 if (dev->flags & IFF_SLAVE)
2470 break;
2471
2472 if (event == NETDEV_UP) {
2473 if (!addrconf_qdisc_ok(dev)) {
2474 /* device is not ready yet. */
2475 printk(KERN_INFO
2476 "ADDRCONF(NETDEV_UP): %s: "
2477 "link is not ready\n",
2478 dev->name);
2479 break;
2480 }
2481
2482 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2483 idev = ipv6_add_dev(dev);
2484
2485 if (idev) {
2486 idev->if_flags |= IF_READY;
2487 run_pending = 1;
2488 }
2489 } else {
2490 if (!addrconf_qdisc_ok(dev)) {
2491 /* device is still not ready. */
2492 break;
2493 }
2494
2495 if (idev) {
2496 if (idev->if_flags & IF_READY) {
2497 /* device is already configured. */
2498 break;
2499 }
2500 idev->if_flags |= IF_READY;
2501 }
2502
2503 printk(KERN_INFO
2504 "ADDRCONF(NETDEV_CHANGE): %s: "
2505 "link becomes ready\n",
2506 dev->name);
2507
2508 run_pending = 1;
2509 }
2510
2511 switch(dev->type) {
2512 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2513 case ARPHRD_SIT:
2514 addrconf_sit_config(dev);
2515 break;
2516 #endif
2517 case ARPHRD_TUNNEL6:
2518 addrconf_ip6_tnl_config(dev);
2519 break;
2520 case ARPHRD_LOOPBACK:
2521 init_loopback(dev);
2522 break;
2523
2524 default:
2525 addrconf_dev_config(dev);
2526 break;
2527 }
2528 if (idev) {
2529 if (run_pending)
2530 addrconf_dad_run(idev);
2531
2532 /* If the MTU changed during the interface down, when the
2533 interface up, the changed MTU must be reflected in the
2534 idev as well as routers.
2535 */
2536 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2537 rt6_mtu_change(dev, dev->mtu);
2538 idev->cnf.mtu6 = dev->mtu;
2539 }
2540 idev->tstamp = jiffies;
2541 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2542 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2543 stop IPv6 on this interface.
2544 */
2545 if (dev->mtu < IPV6_MIN_MTU)
2546 addrconf_ifdown(dev, event != NETDEV_DOWN);
2547 }
2548 break;
2549
2550 case NETDEV_CHANGEMTU:
2551 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2552 rt6_mtu_change(dev, dev->mtu);
2553 idev->cnf.mtu6 = dev->mtu;
2554 break;
2555 }
2556
2557 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2558 idev = ipv6_add_dev(dev);
2559 if (idev)
2560 break;
2561 }
2562
2563 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2564
2565 case NETDEV_DOWN:
2566 case NETDEV_UNREGISTER:
2567 /*
2568 * Remove all addresses from this interface.
2569 */
2570 addrconf_ifdown(dev, event != NETDEV_DOWN);
2571 break;
2572
2573 case NETDEV_CHANGENAME:
2574 if (idev) {
2575 snmp6_unregister_dev(idev);
2576 addrconf_sysctl_unregister(idev);
2577 addrconf_sysctl_register(idev);
2578 err = snmp6_register_dev(idev);
2579 if (err)
2580 return notifier_from_errno(err);
2581 }
2582 break;
2583 }
2584
2585 return NOTIFY_OK;
2586 }
2587
2588 /*
2589 * addrconf module should be notified of a device going up
2590 */
2591 static struct notifier_block ipv6_dev_notf = {
2592 .notifier_call = addrconf_notify,
2593 .priority = 0
2594 };
2595
2596 static int addrconf_ifdown(struct net_device *dev, int how)
2597 {
2598 struct inet6_dev *idev;
2599 struct inet6_ifaddr *ifa, **bifa;
2600 struct net *net = dev_net(dev);
2601 int i;
2602
2603 ASSERT_RTNL();
2604
2605 rt6_ifdown(net, dev);
2606 neigh_ifdown(&nd_tbl, dev);
2607
2608 idev = __in6_dev_get(dev);
2609 if (idev == NULL)
2610 return -ENODEV;
2611
2612 /* Step 1: remove reference to ipv6 device from parent device.
2613 Do not dev_put!
2614 */
2615 if (how) {
2616 idev->dead = 1;
2617
2618 /* protected by rtnl_lock */
2619 rcu_assign_pointer(dev->ip6_ptr, NULL);
2620
2621 /* Step 1.5: remove snmp6 entry */
2622 snmp6_unregister_dev(idev);
2623
2624 }
2625
2626 /* Step 2: clear hash table */
2627 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2628 bifa = &inet6_addr_lst[i];
2629
2630 write_lock_bh(&addrconf_hash_lock);
2631 while ((ifa = *bifa) != NULL) {
2632 if (ifa->idev == idev) {
2633 *bifa = ifa->lst_next;
2634 ifa->lst_next = NULL;
2635 addrconf_del_timer(ifa);
2636 in6_ifa_put(ifa);
2637 continue;
2638 }
2639 bifa = &ifa->lst_next;
2640 }
2641 write_unlock_bh(&addrconf_hash_lock);
2642 }
2643
2644 write_lock_bh(&idev->lock);
2645
2646 /* Step 3: clear flags for stateless addrconf */
2647 if (!how)
2648 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2649
2650 /* Step 4: clear address list */
2651 #ifdef CONFIG_IPV6_PRIVACY
2652 if (how && del_timer(&idev->regen_timer))
2653 in6_dev_put(idev);
2654
2655 /* clear tempaddr list */
2656 while ((ifa = idev->tempaddr_list) != NULL) {
2657 idev->tempaddr_list = ifa->tmp_next;
2658 ifa->tmp_next = NULL;
2659 ifa->dead = 1;
2660 write_unlock_bh(&idev->lock);
2661 spin_lock_bh(&ifa->lock);
2662
2663 if (ifa->ifpub) {
2664 in6_ifa_put(ifa->ifpub);
2665 ifa->ifpub = NULL;
2666 }
2667 spin_unlock_bh(&ifa->lock);
2668 in6_ifa_put(ifa);
2669 write_lock_bh(&idev->lock);
2670 }
2671 #endif
2672 while ((ifa = idev->addr_list) != NULL) {
2673 idev->addr_list = ifa->if_next;
2674 ifa->if_next = NULL;
2675 ifa->dead = 1;
2676 addrconf_del_timer(ifa);
2677 write_unlock_bh(&idev->lock);
2678
2679 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2680 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2681 in6_ifa_put(ifa);
2682
2683 write_lock_bh(&idev->lock);
2684 }
2685 write_unlock_bh(&idev->lock);
2686
2687 /* Step 5: Discard multicast list */
2688
2689 if (how)
2690 ipv6_mc_destroy_dev(idev);
2691 else
2692 ipv6_mc_down(idev);
2693
2694 idev->tstamp = jiffies;
2695
2696 /* Shot the device (if unregistered) */
2697
2698 if (how) {
2699 addrconf_sysctl_unregister(idev);
2700 neigh_parms_release(&nd_tbl, idev->nd_parms);
2701 neigh_ifdown(&nd_tbl, dev);
2702 in6_dev_put(idev);
2703 }
2704 return 0;
2705 }
2706
2707 static void addrconf_rs_timer(unsigned long data)
2708 {
2709 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2710
2711 if (ifp->idev->cnf.forwarding)
2712 goto out;
2713
2714 if (ifp->idev->if_flags & IF_RA_RCVD) {
2715 /*
2716 * Announcement received after solicitation
2717 * was sent
2718 */
2719 goto out;
2720 }
2721
2722 spin_lock(&ifp->lock);
2723 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2724 /* The wait after the last probe can be shorter */
2725 addrconf_mod_timer(ifp, AC_RS,
2726 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2727 ifp->idev->cnf.rtr_solicit_delay :
2728 ifp->idev->cnf.rtr_solicit_interval);
2729 spin_unlock(&ifp->lock);
2730
2731 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2732 } else {
2733 spin_unlock(&ifp->lock);
2734 /*
2735 * Note: we do not support deprecated "all on-link"
2736 * assumption any longer.
2737 */
2738 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2739 ifp->idev->dev->name);
2740 }
2741
2742 out:
2743 in6_ifa_put(ifp);
2744 }
2745
2746 /*
2747 * Duplicate Address Detection
2748 */
2749 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2750 {
2751 unsigned long rand_num;
2752 struct inet6_dev *idev = ifp->idev;
2753
2754 if (ifp->flags & IFA_F_OPTIMISTIC)
2755 rand_num = 0;
2756 else
2757 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2758
2759 ifp->probes = idev->cnf.dad_transmits;
2760 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2761 }
2762
2763 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2764 {
2765 struct inet6_dev *idev = ifp->idev;
2766 struct net_device *dev = idev->dev;
2767
2768 addrconf_join_solict(dev, &ifp->addr);
2769
2770 net_srandom(ifp->addr.s6_addr32[3]);
2771
2772 read_lock_bh(&idev->lock);
2773 if (ifp->dead)
2774 goto out;
2775 spin_lock_bh(&ifp->lock);
2776
2777 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2778 idev->cnf.accept_dad < 1 ||
2779 !(ifp->flags&IFA_F_TENTATIVE) ||
2780 ifp->flags & IFA_F_NODAD) {
2781 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2782 spin_unlock_bh(&ifp->lock);
2783 read_unlock_bh(&idev->lock);
2784
2785 addrconf_dad_completed(ifp);
2786 return;
2787 }
2788
2789 if (!(idev->if_flags & IF_READY)) {
2790 spin_unlock_bh(&ifp->lock);
2791 read_unlock_bh(&idev->lock);
2792 /*
2793 * If the device is not ready:
2794 * - keep it tentative if it is a permanent address.
2795 * - otherwise, kill it.
2796 */
2797 in6_ifa_hold(ifp);
2798 addrconf_dad_stop(ifp);
2799 return;
2800 }
2801
2802 /*
2803 * Optimistic nodes can start receiving
2804 * Frames right away
2805 */
2806 if(ifp->flags & IFA_F_OPTIMISTIC)
2807 ip6_ins_rt(ifp->rt);
2808
2809 addrconf_dad_kick(ifp);
2810 spin_unlock_bh(&ifp->lock);
2811 out:
2812 read_unlock_bh(&idev->lock);
2813 }
2814
2815 static void addrconf_dad_timer(unsigned long data)
2816 {
2817 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2818 struct inet6_dev *idev = ifp->idev;
2819 struct in6_addr mcaddr;
2820
2821 read_lock_bh(&idev->lock);
2822 if (idev->dead) {
2823 read_unlock_bh(&idev->lock);
2824 goto out;
2825 }
2826 spin_lock_bh(&ifp->lock);
2827 if (ifp->probes == 0) {
2828 /*
2829 * DAD was successful
2830 */
2831
2832 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2833 spin_unlock_bh(&ifp->lock);
2834 read_unlock_bh(&idev->lock);
2835
2836 addrconf_dad_completed(ifp);
2837
2838 goto out;
2839 }
2840
2841 ifp->probes--;
2842 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2843 spin_unlock_bh(&ifp->lock);
2844 read_unlock_bh(&idev->lock);
2845
2846 /* send a neighbour solicitation for our addr */
2847 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2848 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2849 out:
2850 in6_ifa_put(ifp);
2851 }
2852
2853 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2854 {
2855 struct net_device * dev = ifp->idev->dev;
2856
2857 /*
2858 * Configure the address for reception. Now it is valid.
2859 */
2860
2861 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2862
2863 /* If added prefix is link local and forwarding is off,
2864 start sending router solicitations.
2865 */
2866
2867 if (ifp->idev->cnf.forwarding == 0 &&
2868 ifp->idev->cnf.rtr_solicits > 0 &&
2869 (dev->flags&IFF_LOOPBACK) == 0 &&
2870 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2871 /*
2872 * If a host as already performed a random delay
2873 * [...] as part of DAD [...] there is no need
2874 * to delay again before sending the first RS
2875 */
2876 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2877
2878 spin_lock_bh(&ifp->lock);
2879 ifp->probes = 1;
2880 ifp->idev->if_flags |= IF_RS_SENT;
2881 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2882 spin_unlock_bh(&ifp->lock);
2883 }
2884 }
2885
2886 static void addrconf_dad_run(struct inet6_dev *idev) {
2887 struct inet6_ifaddr *ifp;
2888
2889 read_lock_bh(&idev->lock);
2890 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2891 spin_lock_bh(&ifp->lock);
2892 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2893 spin_unlock_bh(&ifp->lock);
2894 continue;
2895 }
2896 spin_unlock_bh(&ifp->lock);
2897 addrconf_dad_kick(ifp);
2898 }
2899 read_unlock_bh(&idev->lock);
2900 }
2901
2902 #ifdef CONFIG_PROC_FS
2903 struct if6_iter_state {
2904 struct seq_net_private p;
2905 int bucket;
2906 };
2907
2908 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2909 {
2910 struct inet6_ifaddr *ifa = NULL;
2911 struct if6_iter_state *state = seq->private;
2912 struct net *net = seq_file_net(seq);
2913
2914 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2915 ifa = inet6_addr_lst[state->bucket];
2916
2917 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2918 ifa = ifa->lst_next;
2919 if (ifa)
2920 break;
2921 }
2922 return ifa;
2923 }
2924
2925 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2926 {
2927 struct if6_iter_state *state = seq->private;
2928 struct net *net = seq_file_net(seq);
2929
2930 ifa = ifa->lst_next;
2931 try_again:
2932 if (ifa) {
2933 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2934 ifa = ifa->lst_next;
2935 goto try_again;
2936 }
2937 }
2938
2939 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2940 ifa = inet6_addr_lst[state->bucket];
2941 goto try_again;
2942 }
2943
2944 return ifa;
2945 }
2946
2947 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2948 {
2949 struct inet6_ifaddr *ifa = if6_get_first(seq);
2950
2951 if (ifa)
2952 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2953 --pos;
2954 return pos ? NULL : ifa;
2955 }
2956
2957 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2958 __acquires(addrconf_hash_lock)
2959 {
2960 read_lock_bh(&addrconf_hash_lock);
2961 return if6_get_idx(seq, *pos);
2962 }
2963
2964 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2965 {
2966 struct inet6_ifaddr *ifa;
2967
2968 ifa = if6_get_next(seq, v);
2969 ++*pos;
2970 return ifa;
2971 }
2972
2973 static void if6_seq_stop(struct seq_file *seq, void *v)
2974 __releases(addrconf_hash_lock)
2975 {
2976 read_unlock_bh(&addrconf_hash_lock);
2977 }
2978
2979 static int if6_seq_show(struct seq_file *seq, void *v)
2980 {
2981 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2982 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
2983 &ifp->addr,
2984 ifp->idev->dev->ifindex,
2985 ifp->prefix_len,
2986 ifp->scope,
2987 ifp->flags,
2988 ifp->idev->dev->name);
2989 return 0;
2990 }
2991
2992 static const struct seq_operations if6_seq_ops = {
2993 .start = if6_seq_start,
2994 .next = if6_seq_next,
2995 .show = if6_seq_show,
2996 .stop = if6_seq_stop,
2997 };
2998
2999 static int if6_seq_open(struct inode *inode, struct file *file)
3000 {
3001 return seq_open_net(inode, file, &if6_seq_ops,
3002 sizeof(struct if6_iter_state));
3003 }
3004
3005 static const struct file_operations if6_fops = {
3006 .owner = THIS_MODULE,
3007 .open = if6_seq_open,
3008 .read = seq_read,
3009 .llseek = seq_lseek,
3010 .release = seq_release_net,
3011 };
3012
3013 static int if6_proc_net_init(struct net *net)
3014 {
3015 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3016 return -ENOMEM;
3017 return 0;
3018 }
3019
3020 static void if6_proc_net_exit(struct net *net)
3021 {
3022 proc_net_remove(net, "if_inet6");
3023 }
3024
3025 static struct pernet_operations if6_proc_net_ops = {
3026 .init = if6_proc_net_init,
3027 .exit = if6_proc_net_exit,
3028 };
3029
3030 int __init if6_proc_init(void)
3031 {
3032 return register_pernet_subsys(&if6_proc_net_ops);
3033 }
3034
3035 void if6_proc_exit(void)
3036 {
3037 unregister_pernet_subsys(&if6_proc_net_ops);
3038 }
3039 #endif /* CONFIG_PROC_FS */
3040
3041 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3042 /* Check if address is a home address configured on any interface. */
3043 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3044 {
3045 int ret = 0;
3046 struct inet6_ifaddr * ifp;
3047 u8 hash = ipv6_addr_hash(addr);
3048 read_lock_bh(&addrconf_hash_lock);
3049 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3050 if (!net_eq(dev_net(ifp->idev->dev), net))
3051 continue;
3052 if (ipv6_addr_equal(&ifp->addr, addr) &&
3053 (ifp->flags & IFA_F_HOMEADDRESS)) {
3054 ret = 1;
3055 break;
3056 }
3057 }
3058 read_unlock_bh(&addrconf_hash_lock);
3059 return ret;
3060 }
3061 #endif
3062
3063 /*
3064 * Periodic address status verification
3065 */
3066
3067 static void addrconf_verify(unsigned long foo)
3068 {
3069 struct inet6_ifaddr *ifp;
3070 unsigned long now, next;
3071 int i;
3072
3073 spin_lock_bh(&addrconf_verify_lock);
3074 now = jiffies;
3075 next = now + ADDR_CHECK_FREQUENCY;
3076
3077 del_timer(&addr_chk_timer);
3078
3079 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3080
3081 restart:
3082 read_lock(&addrconf_hash_lock);
3083 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3084 unsigned long age;
3085 #ifdef CONFIG_IPV6_PRIVACY
3086 unsigned long regen_advance;
3087 #endif
3088
3089 if (ifp->flags & IFA_F_PERMANENT)
3090 continue;
3091
3092 spin_lock(&ifp->lock);
3093 age = (now - ifp->tstamp) / HZ;
3094
3095 #ifdef CONFIG_IPV6_PRIVACY
3096 regen_advance = ifp->idev->cnf.regen_max_retry *
3097 ifp->idev->cnf.dad_transmits *
3098 ifp->idev->nd_parms->retrans_time / HZ;
3099 #endif
3100
3101 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3102 age >= ifp->valid_lft) {
3103 spin_unlock(&ifp->lock);
3104 in6_ifa_hold(ifp);
3105 read_unlock(&addrconf_hash_lock);
3106 ipv6_del_addr(ifp);
3107 goto restart;
3108 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3109 spin_unlock(&ifp->lock);
3110 continue;
3111 } else if (age >= ifp->prefered_lft) {
3112 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3113 int deprecate = 0;
3114
3115 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3116 deprecate = 1;
3117 ifp->flags |= IFA_F_DEPRECATED;
3118 }
3119
3120 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3121 next = ifp->tstamp + ifp->valid_lft * HZ;
3122
3123 spin_unlock(&ifp->lock);
3124
3125 if (deprecate) {
3126 in6_ifa_hold(ifp);
3127 read_unlock(&addrconf_hash_lock);
3128
3129 ipv6_ifa_notify(0, ifp);
3130 in6_ifa_put(ifp);
3131 goto restart;
3132 }
3133 #ifdef CONFIG_IPV6_PRIVACY
3134 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3135 !(ifp->flags&IFA_F_TENTATIVE)) {
3136 if (age >= ifp->prefered_lft - regen_advance) {
3137 struct inet6_ifaddr *ifpub = ifp->ifpub;
3138 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3139 next = ifp->tstamp + ifp->prefered_lft * HZ;
3140 if (!ifp->regen_count && ifpub) {
3141 ifp->regen_count++;
3142 in6_ifa_hold(ifp);
3143 in6_ifa_hold(ifpub);
3144 spin_unlock(&ifp->lock);
3145 read_unlock(&addrconf_hash_lock);
3146 spin_lock(&ifpub->lock);
3147 ifpub->regen_count = 0;
3148 spin_unlock(&ifpub->lock);
3149 ipv6_create_tempaddr(ifpub, ifp);
3150 in6_ifa_put(ifpub);
3151 in6_ifa_put(ifp);
3152 goto restart;
3153 }
3154 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3155 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3156 spin_unlock(&ifp->lock);
3157 #endif
3158 } else {
3159 /* ifp->prefered_lft <= ifp->valid_lft */
3160 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3161 next = ifp->tstamp + ifp->prefered_lft * HZ;
3162 spin_unlock(&ifp->lock);
3163 }
3164 }
3165 read_unlock(&addrconf_hash_lock);
3166 }
3167
3168 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3169 add_timer(&addr_chk_timer);
3170 spin_unlock_bh(&addrconf_verify_lock);
3171 }
3172
3173 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3174 {
3175 struct in6_addr *pfx = NULL;
3176
3177 if (addr)
3178 pfx = nla_data(addr);
3179
3180 if (local) {
3181 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3182 pfx = NULL;
3183 else
3184 pfx = nla_data(local);
3185 }
3186
3187 return pfx;
3188 }
3189
3190 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3191 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3192 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3193 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3194 };
3195
3196 static int
3197 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3198 {
3199 struct net *net = sock_net(skb->sk);
3200 struct ifaddrmsg *ifm;
3201 struct nlattr *tb[IFA_MAX+1];
3202 struct in6_addr *pfx;
3203 int err;
3204
3205 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3206 if (err < 0)
3207 return err;
3208
3209 ifm = nlmsg_data(nlh);
3210 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3211 if (pfx == NULL)
3212 return -EINVAL;
3213
3214 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3215 }
3216
3217 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3218 u32 prefered_lft, u32 valid_lft)
3219 {
3220 u32 flags;
3221 clock_t expires;
3222 unsigned long timeout;
3223
3224 if (!valid_lft || (prefered_lft > valid_lft))
3225 return -EINVAL;
3226
3227 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3228 if (addrconf_finite_timeout(timeout)) {
3229 expires = jiffies_to_clock_t(timeout * HZ);
3230 valid_lft = timeout;
3231 flags = RTF_EXPIRES;
3232 } else {
3233 expires = 0;
3234 flags = 0;
3235 ifa_flags |= IFA_F_PERMANENT;
3236 }
3237
3238 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3239 if (addrconf_finite_timeout(timeout)) {
3240 if (timeout == 0)
3241 ifa_flags |= IFA_F_DEPRECATED;
3242 prefered_lft = timeout;
3243 }
3244
3245 spin_lock_bh(&ifp->lock);
3246 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3247 ifp->tstamp = jiffies;
3248 ifp->valid_lft = valid_lft;
3249 ifp->prefered_lft = prefered_lft;
3250
3251 spin_unlock_bh(&ifp->lock);
3252 if (!(ifp->flags&IFA_F_TENTATIVE))
3253 ipv6_ifa_notify(0, ifp);
3254
3255 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3256 expires, flags);
3257 addrconf_verify(0);
3258
3259 return 0;
3260 }
3261
3262 static int
3263 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3264 {
3265 struct net *net = sock_net(skb->sk);
3266 struct ifaddrmsg *ifm;
3267 struct nlattr *tb[IFA_MAX+1];
3268 struct in6_addr *pfx;
3269 struct inet6_ifaddr *ifa;
3270 struct net_device *dev;
3271 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3272 u8 ifa_flags;
3273 int err;
3274
3275 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3276 if (err < 0)
3277 return err;
3278
3279 ifm = nlmsg_data(nlh);
3280 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3281 if (pfx == NULL)
3282 return -EINVAL;
3283
3284 if (tb[IFA_CACHEINFO]) {
3285 struct ifa_cacheinfo *ci;
3286
3287 ci = nla_data(tb[IFA_CACHEINFO]);
3288 valid_lft = ci->ifa_valid;
3289 preferred_lft = ci->ifa_prefered;
3290 } else {
3291 preferred_lft = INFINITY_LIFE_TIME;
3292 valid_lft = INFINITY_LIFE_TIME;
3293 }
3294
3295 dev = __dev_get_by_index(net, ifm->ifa_index);
3296 if (dev == NULL)
3297 return -ENODEV;
3298
3299 /* We ignore other flags so far. */
3300 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3301
3302 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3303 if (ifa == NULL) {
3304 /*
3305 * It would be best to check for !NLM_F_CREATE here but
3306 * userspace alreay relies on not having to provide this.
3307 */
3308 return inet6_addr_add(net, ifm->ifa_index, pfx,
3309 ifm->ifa_prefixlen, ifa_flags,
3310 preferred_lft, valid_lft);
3311 }
3312
3313 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3314 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3315 err = -EEXIST;
3316 else
3317 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3318
3319 in6_ifa_put(ifa);
3320
3321 return err;
3322 }
3323
3324 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3325 u8 scope, int ifindex)
3326 {
3327 struct ifaddrmsg *ifm;
3328
3329 ifm = nlmsg_data(nlh);
3330 ifm->ifa_family = AF_INET6;
3331 ifm->ifa_prefixlen = prefixlen;
3332 ifm->ifa_flags = flags;
3333 ifm->ifa_scope = scope;
3334 ifm->ifa_index = ifindex;
3335 }
3336
3337 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3338 unsigned long tstamp, u32 preferred, u32 valid)
3339 {
3340 struct ifa_cacheinfo ci;
3341
3342 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3343 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3344 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3345 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3346 ci.ifa_prefered = preferred;
3347 ci.ifa_valid = valid;
3348
3349 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3350 }
3351
3352 static inline int rt_scope(int ifa_scope)
3353 {
3354 if (ifa_scope & IFA_HOST)
3355 return RT_SCOPE_HOST;
3356 else if (ifa_scope & IFA_LINK)
3357 return RT_SCOPE_LINK;
3358 else if (ifa_scope & IFA_SITE)
3359 return RT_SCOPE_SITE;
3360 else
3361 return RT_SCOPE_UNIVERSE;
3362 }
3363
3364 static inline int inet6_ifaddr_msgsize(void)
3365 {
3366 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3367 + nla_total_size(16) /* IFA_ADDRESS */
3368 + nla_total_size(sizeof(struct ifa_cacheinfo));
3369 }
3370
3371 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3372 u32 pid, u32 seq, int event, unsigned int flags)
3373 {
3374 struct nlmsghdr *nlh;
3375 u32 preferred, valid;
3376
3377 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3378 if (nlh == NULL)
3379 return -EMSGSIZE;
3380
3381 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3382 ifa->idev->dev->ifindex);
3383
3384 if (!(ifa->flags&IFA_F_PERMANENT)) {
3385 preferred = ifa->prefered_lft;
3386 valid = ifa->valid_lft;
3387 if (preferred != INFINITY_LIFE_TIME) {
3388 long tval = (jiffies - ifa->tstamp)/HZ;
3389 if (preferred > tval)
3390 preferred -= tval;
3391 else
3392 preferred = 0;
3393 if (valid != INFINITY_LIFE_TIME)
3394 valid -= tval;
3395 }
3396 } else {
3397 preferred = INFINITY_LIFE_TIME;
3398 valid = INFINITY_LIFE_TIME;
3399 }
3400
3401 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3402 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3403 nlmsg_cancel(skb, nlh);
3404 return -EMSGSIZE;
3405 }
3406
3407 return nlmsg_end(skb, nlh);
3408 }
3409
3410 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3411 u32 pid, u32 seq, int event, u16 flags)
3412 {
3413 struct nlmsghdr *nlh;
3414 u8 scope = RT_SCOPE_UNIVERSE;
3415 int ifindex = ifmca->idev->dev->ifindex;
3416
3417 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3418 scope = RT_SCOPE_SITE;
3419
3420 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3421 if (nlh == NULL)
3422 return -EMSGSIZE;
3423
3424 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3425 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3426 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3427 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3428 nlmsg_cancel(skb, nlh);
3429 return -EMSGSIZE;
3430 }
3431
3432 return nlmsg_end(skb, nlh);
3433 }
3434
3435 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3436 u32 pid, u32 seq, int event, unsigned int flags)
3437 {
3438 struct nlmsghdr *nlh;
3439 u8 scope = RT_SCOPE_UNIVERSE;
3440 int ifindex = ifaca->aca_idev->dev->ifindex;
3441
3442 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3443 scope = RT_SCOPE_SITE;
3444
3445 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3446 if (nlh == NULL)
3447 return -EMSGSIZE;
3448
3449 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3450 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3451 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3452 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3453 nlmsg_cancel(skb, nlh);
3454 return -EMSGSIZE;
3455 }
3456
3457 return nlmsg_end(skb, nlh);
3458 }
3459
3460 enum addr_type_t
3461 {
3462 UNICAST_ADDR,
3463 MULTICAST_ADDR,
3464 ANYCAST_ADDR,
3465 };
3466
3467 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3468 enum addr_type_t type)
3469 {
3470 int idx, ip_idx;
3471 int s_idx, s_ip_idx;
3472 int err = 1;
3473 struct net_device *dev;
3474 struct inet6_dev *idev = NULL;
3475 struct inet6_ifaddr *ifa;
3476 struct ifmcaddr6 *ifmca;
3477 struct ifacaddr6 *ifaca;
3478 struct net *net = sock_net(skb->sk);
3479
3480 s_idx = cb->args[0];
3481 s_ip_idx = ip_idx = cb->args[1];
3482
3483 idx = 0;
3484 for_each_netdev(net, dev) {
3485 if (idx < s_idx)
3486 goto cont;
3487 if (idx > s_idx)
3488 s_ip_idx = 0;
3489 ip_idx = 0;
3490 if ((idev = in6_dev_get(dev)) == NULL)
3491 goto cont;
3492 read_lock_bh(&idev->lock);
3493 switch (type) {
3494 case UNICAST_ADDR:
3495 /* unicast address incl. temp addr */
3496 for (ifa = idev->addr_list; ifa;
3497 ifa = ifa->if_next, ip_idx++) {
3498 if (ip_idx < s_ip_idx)
3499 continue;
3500 err = inet6_fill_ifaddr(skb, ifa,
3501 NETLINK_CB(cb->skb).pid,
3502 cb->nlh->nlmsg_seq,
3503 RTM_NEWADDR,
3504 NLM_F_MULTI);
3505 }
3506 break;
3507 case MULTICAST_ADDR:
3508 /* multicast address */
3509 for (ifmca = idev->mc_list; ifmca;
3510 ifmca = ifmca->next, ip_idx++) {
3511 if (ip_idx < s_ip_idx)
3512 continue;
3513 err = inet6_fill_ifmcaddr(skb, ifmca,
3514 NETLINK_CB(cb->skb).pid,
3515 cb->nlh->nlmsg_seq,
3516 RTM_GETMULTICAST,
3517 NLM_F_MULTI);
3518 }
3519 break;
3520 case ANYCAST_ADDR:
3521 /* anycast address */
3522 for (ifaca = idev->ac_list; ifaca;
3523 ifaca = ifaca->aca_next, ip_idx++) {
3524 if (ip_idx < s_ip_idx)
3525 continue;
3526 err = inet6_fill_ifacaddr(skb, ifaca,
3527 NETLINK_CB(cb->skb).pid,
3528 cb->nlh->nlmsg_seq,
3529 RTM_GETANYCAST,
3530 NLM_F_MULTI);
3531 }
3532 break;
3533 default:
3534 break;
3535 }
3536 read_unlock_bh(&idev->lock);
3537 in6_dev_put(idev);
3538
3539 if (err <= 0)
3540 break;
3541 cont:
3542 idx++;
3543 }
3544 cb->args[0] = idx;
3545 cb->args[1] = ip_idx;
3546 return skb->len;
3547 }
3548
3549 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3550 {
3551 enum addr_type_t type = UNICAST_ADDR;
3552
3553 return inet6_dump_addr(skb, cb, type);
3554 }
3555
3556 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3557 {
3558 enum addr_type_t type = MULTICAST_ADDR;
3559
3560 return inet6_dump_addr(skb, cb, type);
3561 }
3562
3563
3564 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3565 {
3566 enum addr_type_t type = ANYCAST_ADDR;
3567
3568 return inet6_dump_addr(skb, cb, type);
3569 }
3570
3571 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3572 void *arg)
3573 {
3574 struct net *net = sock_net(in_skb->sk);
3575 struct ifaddrmsg *ifm;
3576 struct nlattr *tb[IFA_MAX+1];
3577 struct in6_addr *addr = NULL;
3578 struct net_device *dev = NULL;
3579 struct inet6_ifaddr *ifa;
3580 struct sk_buff *skb;
3581 int err;
3582
3583 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3584 if (err < 0)
3585 goto errout;
3586
3587 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3588 if (addr == NULL) {
3589 err = -EINVAL;
3590 goto errout;
3591 }
3592
3593 ifm = nlmsg_data(nlh);
3594 if (ifm->ifa_index)
3595 dev = __dev_get_by_index(net, ifm->ifa_index);
3596
3597 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3598 err = -EADDRNOTAVAIL;
3599 goto errout;
3600 }
3601
3602 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3603 err = -ENOBUFS;
3604 goto errout_ifa;
3605 }
3606
3607 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3608 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3609 if (err < 0) {
3610 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3611 WARN_ON(err == -EMSGSIZE);
3612 kfree_skb(skb);
3613 goto errout_ifa;
3614 }
3615 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3616 errout_ifa:
3617 in6_ifa_put(ifa);
3618 errout:
3619 return err;
3620 }
3621
3622 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3623 {
3624 struct sk_buff *skb;
3625 struct net *net = dev_net(ifa->idev->dev);
3626 int err = -ENOBUFS;
3627
3628 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3629 if (skb == NULL)
3630 goto errout;
3631
3632 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3633 if (err < 0) {
3634 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3635 WARN_ON(err == -EMSGSIZE);
3636 kfree_skb(skb);
3637 goto errout;
3638 }
3639 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3640 return;
3641 errout:
3642 if (err < 0)
3643 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3644 }
3645
3646 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3647 __s32 *array, int bytes)
3648 {
3649 BUG_ON(bytes < (DEVCONF_MAX * 4));
3650
3651 memset(array, 0, bytes);
3652 array[DEVCONF_FORWARDING] = cnf->forwarding;
3653 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3654 array[DEVCONF_MTU6] = cnf->mtu6;
3655 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3656 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3657 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3658 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3659 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3660 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3661 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3662 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3663 #ifdef CONFIG_IPV6_PRIVACY
3664 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3665 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3666 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3667 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3668 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3669 #endif
3670 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3671 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3672 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3673 #ifdef CONFIG_IPV6_ROUTER_PREF
3674 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3675 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3676 #ifdef CONFIG_IPV6_ROUTE_INFO
3677 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3678 #endif
3679 #endif
3680 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3681 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3682 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3683 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3684 #endif
3685 #ifdef CONFIG_IPV6_MROUTE
3686 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3687 #endif
3688 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3689 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3690 }
3691
3692 static inline size_t inet6_if_nlmsg_size(void)
3693 {
3694 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3695 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3696 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3697 + nla_total_size(4) /* IFLA_MTU */
3698 + nla_total_size(4) /* IFLA_LINK */
3699 + nla_total_size( /* IFLA_PROTINFO */
3700 nla_total_size(4) /* IFLA_INET6_FLAGS */
3701 + nla_total_size(sizeof(struct ifla_cacheinfo))
3702 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3703 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3704 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3705 );
3706 }
3707
3708 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3709 int bytes)
3710 {
3711 int i;
3712 int pad = bytes - sizeof(u64) * items;
3713 BUG_ON(pad < 0);
3714
3715 /* Use put_unaligned() because stats may not be aligned for u64. */
3716 put_unaligned(items, &stats[0]);
3717 for (i = 1; i < items; i++)
3718 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3719
3720 memset(&stats[items], 0, pad);
3721 }
3722
3723 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3724 int bytes)
3725 {
3726 switch(attrtype) {
3727 case IFLA_INET6_STATS:
3728 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3729 break;
3730 case IFLA_INET6_ICMP6STATS:
3731 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3732 break;
3733 }
3734 }
3735
3736 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3737 u32 pid, u32 seq, int event, unsigned int flags)
3738 {
3739 struct net_device *dev = idev->dev;
3740 struct nlattr *nla;
3741 struct ifinfomsg *hdr;
3742 struct nlmsghdr *nlh;
3743 void *protoinfo;
3744 struct ifla_cacheinfo ci;
3745
3746 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3747 if (nlh == NULL)
3748 return -EMSGSIZE;
3749
3750 hdr = nlmsg_data(nlh);
3751 hdr->ifi_family = AF_INET6;
3752 hdr->__ifi_pad = 0;
3753 hdr->ifi_type = dev->type;
3754 hdr->ifi_index = dev->ifindex;
3755 hdr->ifi_flags = dev_get_flags(dev);
3756 hdr->ifi_change = 0;
3757
3758 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3759
3760 if (dev->addr_len)
3761 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3762
3763 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3764 if (dev->ifindex != dev->iflink)
3765 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3766
3767 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3768 if (protoinfo == NULL)
3769 goto nla_put_failure;
3770
3771 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3772
3773 ci.max_reasm_len = IPV6_MAXPLEN;
3774 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3775 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3776 ci.reachable_time = idev->nd_parms->reachable_time;
3777 ci.retrans_time = idev->nd_parms->retrans_time;
3778 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3779
3780 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3781 if (nla == NULL)
3782 goto nla_put_failure;
3783 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3784
3785 /* XXX - MC not implemented */
3786
3787 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3788 if (nla == NULL)
3789 goto nla_put_failure;
3790 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3791
3792 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3793 if (nla == NULL)
3794 goto nla_put_failure;
3795 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3796
3797 nla_nest_end(skb, protoinfo);
3798 return nlmsg_end(skb, nlh);
3799
3800 nla_put_failure:
3801 nlmsg_cancel(skb, nlh);
3802 return -EMSGSIZE;
3803 }
3804
3805 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3806 {
3807 struct net *net = sock_net(skb->sk);
3808 int idx, err;
3809 int s_idx = cb->args[0];
3810 struct net_device *dev;
3811 struct inet6_dev *idev;
3812
3813 read_lock(&dev_base_lock);
3814 idx = 0;
3815 for_each_netdev(net, dev) {
3816 if (idx < s_idx)
3817 goto cont;
3818 if ((idev = in6_dev_get(dev)) == NULL)
3819 goto cont;
3820 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3821 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3822 in6_dev_put(idev);
3823 if (err <= 0)
3824 break;
3825 cont:
3826 idx++;
3827 }
3828 read_unlock(&dev_base_lock);
3829 cb->args[0] = idx;
3830
3831 return skb->len;
3832 }
3833
3834 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3835 {
3836 struct sk_buff *skb;
3837 struct net *net = dev_net(idev->dev);
3838 int err = -ENOBUFS;
3839
3840 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3841 if (skb == NULL)
3842 goto errout;
3843
3844 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3845 if (err < 0) {
3846 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3847 WARN_ON(err == -EMSGSIZE);
3848 kfree_skb(skb);
3849 goto errout;
3850 }
3851 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3852 return;
3853 errout:
3854 if (err < 0)
3855 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3856 }
3857
3858 static inline size_t inet6_prefix_nlmsg_size(void)
3859 {
3860 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3861 + nla_total_size(sizeof(struct in6_addr))
3862 + nla_total_size(sizeof(struct prefix_cacheinfo));
3863 }
3864
3865 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3866 struct prefix_info *pinfo, u32 pid, u32 seq,
3867 int event, unsigned int flags)
3868 {
3869 struct prefixmsg *pmsg;
3870 struct nlmsghdr *nlh;
3871 struct prefix_cacheinfo ci;
3872
3873 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3874 if (nlh == NULL)
3875 return -EMSGSIZE;
3876
3877 pmsg = nlmsg_data(nlh);
3878 pmsg->prefix_family = AF_INET6;
3879 pmsg->prefix_pad1 = 0;
3880 pmsg->prefix_pad2 = 0;
3881 pmsg->prefix_ifindex = idev->dev->ifindex;
3882 pmsg->prefix_len = pinfo->prefix_len;
3883 pmsg->prefix_type = pinfo->type;
3884 pmsg->prefix_pad3 = 0;
3885 pmsg->prefix_flags = 0;
3886 if (pinfo->onlink)
3887 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3888 if (pinfo->autoconf)
3889 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3890
3891 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3892
3893 ci.preferred_time = ntohl(pinfo->prefered);
3894 ci.valid_time = ntohl(pinfo->valid);
3895 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3896
3897 return nlmsg_end(skb, nlh);
3898
3899 nla_put_failure:
3900 nlmsg_cancel(skb, nlh);
3901 return -EMSGSIZE;
3902 }
3903
3904 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3905 struct prefix_info *pinfo)
3906 {
3907 struct sk_buff *skb;
3908 struct net *net = dev_net(idev->dev);
3909 int err = -ENOBUFS;
3910
3911 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3912 if (skb == NULL)
3913 goto errout;
3914
3915 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3916 if (err < 0) {
3917 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3918 WARN_ON(err == -EMSGSIZE);
3919 kfree_skb(skb);
3920 goto errout;
3921 }
3922 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3923 return;
3924 errout:
3925 if (err < 0)
3926 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3927 }
3928
3929 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3930 {
3931 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3932
3933 switch (event) {
3934 case RTM_NEWADDR:
3935 /*
3936 * If the address was optimistic
3937 * we inserted the route at the start of
3938 * our DAD process, so we don't need
3939 * to do it again
3940 */
3941 if (!(ifp->rt->rt6i_node))
3942 ip6_ins_rt(ifp->rt);
3943 if (ifp->idev->cnf.forwarding)
3944 addrconf_join_anycast(ifp);
3945 break;
3946 case RTM_DELADDR:
3947 if (ifp->idev->cnf.forwarding)
3948 addrconf_leave_anycast(ifp);
3949 addrconf_leave_solict(ifp->idev, &ifp->addr);
3950 dst_hold(&ifp->rt->u.dst);
3951 if (ip6_del_rt(ifp->rt))
3952 dst_free(&ifp->rt->u.dst);
3953 break;
3954 }
3955 }
3956
3957 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3958 {
3959 rcu_read_lock_bh();
3960 if (likely(ifp->idev->dead == 0))
3961 __ipv6_ifa_notify(event, ifp);
3962 rcu_read_unlock_bh();
3963 }
3964
3965 #ifdef CONFIG_SYSCTL
3966
3967 static
3968 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3969 void __user *buffer, size_t *lenp, loff_t *ppos)
3970 {
3971 int *valp = ctl->data;
3972 int val = *valp;
3973 int ret;
3974
3975 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3976
3977 if (write)
3978 ret = addrconf_fixup_forwarding(ctl, valp, val);
3979 return ret;
3980 }
3981
3982 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3983 void __user *oldval,
3984 size_t __user *oldlenp,
3985 void __user *newval, size_t newlen)
3986 {
3987 int *valp = table->data;
3988 int val = *valp;
3989 int new;
3990
3991 if (!newval || !newlen)
3992 return 0;
3993 if (newlen != sizeof(int))
3994 return -EINVAL;
3995 if (get_user(new, (int __user *)newval))
3996 return -EFAULT;
3997 if (new == *valp)
3998 return 0;
3999 if (oldval && oldlenp) {
4000 size_t len;
4001 if (get_user(len, oldlenp))
4002 return -EFAULT;
4003 if (len) {
4004 if (len > table->maxlen)
4005 len = table->maxlen;
4006 if (copy_to_user(oldval, valp, len))
4007 return -EFAULT;
4008 if (put_user(len, oldlenp))
4009 return -EFAULT;
4010 }
4011 }
4012
4013 *valp = new;
4014 return addrconf_fixup_forwarding(table, valp, val);
4015 }
4016
4017 static void dev_disable_change(struct inet6_dev *idev)
4018 {
4019 if (!idev || !idev->dev)
4020 return;
4021
4022 if (idev->cnf.disable_ipv6)
4023 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4024 else
4025 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4026 }
4027
4028 static void addrconf_disable_change(struct net *net, __s32 newf)
4029 {
4030 struct net_device *dev;
4031 struct inet6_dev *idev;
4032
4033 read_lock(&dev_base_lock);
4034 for_each_netdev(net, dev) {
4035 rcu_read_lock();
4036 idev = __in6_dev_get(dev);
4037 if (idev) {
4038 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4039 idev->cnf.disable_ipv6 = newf;
4040 if (changed)
4041 dev_disable_change(idev);
4042 }
4043 rcu_read_unlock();
4044 }
4045 read_unlock(&dev_base_lock);
4046 }
4047
4048 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4049 {
4050 struct net *net;
4051
4052 net = (struct net *)table->extra2;
4053
4054 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4055 return 0;
4056
4057 if (!rtnl_trylock())
4058 return restart_syscall();
4059
4060 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4061 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4062 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4063 addrconf_disable_change(net, newf);
4064 } else if ((!*p) ^ (!old))
4065 dev_disable_change((struct inet6_dev *)table->extra1);
4066
4067 rtnl_unlock();
4068 return 0;
4069 }
4070
4071 static
4072 int addrconf_sysctl_disable(ctl_table *ctl, int write, struct file * filp,
4073 void __user *buffer, size_t *lenp, loff_t *ppos)
4074 {
4075 int *valp = ctl->data;
4076 int val = *valp;
4077 int ret;
4078
4079 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
4080
4081 if (write)
4082 ret = addrconf_disable_ipv6(ctl, valp, val);
4083 return ret;
4084 }
4085
4086 static struct addrconf_sysctl_table
4087 {
4088 struct ctl_table_header *sysctl_header;
4089 ctl_table addrconf_vars[DEVCONF_MAX+1];
4090 char *dev_name;
4091 } addrconf_sysctl __read_mostly = {
4092 .sysctl_header = NULL,
4093 .addrconf_vars = {
4094 {
4095 .ctl_name = NET_IPV6_FORWARDING,
4096 .procname = "forwarding",
4097 .data = &ipv6_devconf.forwarding,
4098 .maxlen = sizeof(int),
4099 .mode = 0644,
4100 .proc_handler = addrconf_sysctl_forward,
4101 .strategy = addrconf_sysctl_forward_strategy,
4102 },
4103 {
4104 .ctl_name = NET_IPV6_HOP_LIMIT,
4105 .procname = "hop_limit",
4106 .data = &ipv6_devconf.hop_limit,
4107 .maxlen = sizeof(int),
4108 .mode = 0644,
4109 .proc_handler = proc_dointvec,
4110 },
4111 {
4112 .ctl_name = NET_IPV6_MTU,
4113 .procname = "mtu",
4114 .data = &ipv6_devconf.mtu6,
4115 .maxlen = sizeof(int),
4116 .mode = 0644,
4117 .proc_handler = proc_dointvec,
4118 },
4119 {
4120 .ctl_name = NET_IPV6_ACCEPT_RA,
4121 .procname = "accept_ra",
4122 .data = &ipv6_devconf.accept_ra,
4123 .maxlen = sizeof(int),
4124 .mode = 0644,
4125 .proc_handler = proc_dointvec,
4126 },
4127 {
4128 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
4129 .procname = "accept_redirects",
4130 .data = &ipv6_devconf.accept_redirects,
4131 .maxlen = sizeof(int),
4132 .mode = 0644,
4133 .proc_handler = proc_dointvec,
4134 },
4135 {
4136 .ctl_name = NET_IPV6_AUTOCONF,
4137 .procname = "autoconf",
4138 .data = &ipv6_devconf.autoconf,
4139 .maxlen = sizeof(int),
4140 .mode = 0644,
4141 .proc_handler = proc_dointvec,
4142 },
4143 {
4144 .ctl_name = NET_IPV6_DAD_TRANSMITS,
4145 .procname = "dad_transmits",
4146 .data = &ipv6_devconf.dad_transmits,
4147 .maxlen = sizeof(int),
4148 .mode = 0644,
4149 .proc_handler = proc_dointvec,
4150 },
4151 {
4152 .ctl_name = NET_IPV6_RTR_SOLICITS,
4153 .procname = "router_solicitations",
4154 .data = &ipv6_devconf.rtr_solicits,
4155 .maxlen = sizeof(int),
4156 .mode = 0644,
4157 .proc_handler = proc_dointvec,
4158 },
4159 {
4160 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
4161 .procname = "router_solicitation_interval",
4162 .data = &ipv6_devconf.rtr_solicit_interval,
4163 .maxlen = sizeof(int),
4164 .mode = 0644,
4165 .proc_handler = proc_dointvec_jiffies,
4166 .strategy = sysctl_jiffies,
4167 },
4168 {
4169 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
4170 .procname = "router_solicitation_delay",
4171 .data = &ipv6_devconf.rtr_solicit_delay,
4172 .maxlen = sizeof(int),
4173 .mode = 0644,
4174 .proc_handler = proc_dointvec_jiffies,
4175 .strategy = sysctl_jiffies,
4176 },
4177 {
4178 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
4179 .procname = "force_mld_version",
4180 .data = &ipv6_devconf.force_mld_version,
4181 .maxlen = sizeof(int),
4182 .mode = 0644,
4183 .proc_handler = proc_dointvec,
4184 },
4185 #ifdef CONFIG_IPV6_PRIVACY
4186 {
4187 .ctl_name = NET_IPV6_USE_TEMPADDR,
4188 .procname = "use_tempaddr",
4189 .data = &ipv6_devconf.use_tempaddr,
4190 .maxlen = sizeof(int),
4191 .mode = 0644,
4192 .proc_handler = proc_dointvec,
4193 },
4194 {
4195 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
4196 .procname = "temp_valid_lft",
4197 .data = &ipv6_devconf.temp_valid_lft,
4198 .maxlen = sizeof(int),
4199 .mode = 0644,
4200 .proc_handler = proc_dointvec,
4201 },
4202 {
4203 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4204 .procname = "temp_prefered_lft",
4205 .data = &ipv6_devconf.temp_prefered_lft,
4206 .maxlen = sizeof(int),
4207 .mode = 0644,
4208 .proc_handler = proc_dointvec,
4209 },
4210 {
4211 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4212 .procname = "regen_max_retry",
4213 .data = &ipv6_devconf.regen_max_retry,
4214 .maxlen = sizeof(int),
4215 .mode = 0644,
4216 .proc_handler = proc_dointvec,
4217 },
4218 {
4219 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4220 .procname = "max_desync_factor",
4221 .data = &ipv6_devconf.max_desync_factor,
4222 .maxlen = sizeof(int),
4223 .mode = 0644,
4224 .proc_handler = proc_dointvec,
4225 },
4226 #endif
4227 {
4228 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4229 .procname = "max_addresses",
4230 .data = &ipv6_devconf.max_addresses,
4231 .maxlen = sizeof(int),
4232 .mode = 0644,
4233 .proc_handler = proc_dointvec,
4234 },
4235 {
4236 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4237 .procname = "accept_ra_defrtr",
4238 .data = &ipv6_devconf.accept_ra_defrtr,
4239 .maxlen = sizeof(int),
4240 .mode = 0644,
4241 .proc_handler = proc_dointvec,
4242 },
4243 {
4244 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4245 .procname = "accept_ra_pinfo",
4246 .data = &ipv6_devconf.accept_ra_pinfo,
4247 .maxlen = sizeof(int),
4248 .mode = 0644,
4249 .proc_handler = proc_dointvec,
4250 },
4251 #ifdef CONFIG_IPV6_ROUTER_PREF
4252 {
4253 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4254 .procname = "accept_ra_rtr_pref",
4255 .data = &ipv6_devconf.accept_ra_rtr_pref,
4256 .maxlen = sizeof(int),
4257 .mode = 0644,
4258 .proc_handler = proc_dointvec,
4259 },
4260 {
4261 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4262 .procname = "router_probe_interval",
4263 .data = &ipv6_devconf.rtr_probe_interval,
4264 .maxlen = sizeof(int),
4265 .mode = 0644,
4266 .proc_handler = proc_dointvec_jiffies,
4267 .strategy = sysctl_jiffies,
4268 },
4269 #ifdef CONFIG_IPV6_ROUTE_INFO
4270 {
4271 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4272 .procname = "accept_ra_rt_info_max_plen",
4273 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4274 .maxlen = sizeof(int),
4275 .mode = 0644,
4276 .proc_handler = proc_dointvec,
4277 },
4278 #endif
4279 #endif
4280 {
4281 .ctl_name = NET_IPV6_PROXY_NDP,
4282 .procname = "proxy_ndp",
4283 .data = &ipv6_devconf.proxy_ndp,
4284 .maxlen = sizeof(int),
4285 .mode = 0644,
4286 .proc_handler = proc_dointvec,
4287 },
4288 {
4289 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4290 .procname = "accept_source_route",
4291 .data = &ipv6_devconf.accept_source_route,
4292 .maxlen = sizeof(int),
4293 .mode = 0644,
4294 .proc_handler = proc_dointvec,
4295 },
4296 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4297 {
4298 .ctl_name = CTL_UNNUMBERED,
4299 .procname = "optimistic_dad",
4300 .data = &ipv6_devconf.optimistic_dad,
4301 .maxlen = sizeof(int),
4302 .mode = 0644,
4303 .proc_handler = proc_dointvec,
4304
4305 },
4306 #endif
4307 #ifdef CONFIG_IPV6_MROUTE
4308 {
4309 .ctl_name = CTL_UNNUMBERED,
4310 .procname = "mc_forwarding",
4311 .data = &ipv6_devconf.mc_forwarding,
4312 .maxlen = sizeof(int),
4313 .mode = 0444,
4314 .proc_handler = proc_dointvec,
4315 },
4316 #endif
4317 {
4318 .ctl_name = CTL_UNNUMBERED,
4319 .procname = "disable_ipv6",
4320 .data = &ipv6_devconf.disable_ipv6,
4321 .maxlen = sizeof(int),
4322 .mode = 0644,
4323 .proc_handler = addrconf_sysctl_disable,
4324 .strategy = sysctl_intvec,
4325 },
4326 {
4327 .ctl_name = CTL_UNNUMBERED,
4328 .procname = "accept_dad",
4329 .data = &ipv6_devconf.accept_dad,
4330 .maxlen = sizeof(int),
4331 .mode = 0644,
4332 .proc_handler = proc_dointvec,
4333 },
4334 {
4335 .ctl_name = 0, /* sentinel */
4336 }
4337 },
4338 };
4339
4340 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4341 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4342 {
4343 int i;
4344 struct addrconf_sysctl_table *t;
4345
4346 #define ADDRCONF_CTL_PATH_DEV 3
4347
4348 struct ctl_path addrconf_ctl_path[] = {
4349 { .procname = "net", .ctl_name = CTL_NET, },
4350 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4351 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4352 { /* to be set */ },
4353 { },
4354 };
4355
4356
4357 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4358 if (t == NULL)
4359 goto out;
4360
4361 for (i=0; t->addrconf_vars[i].data; i++) {
4362 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4363 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4364 t->addrconf_vars[i].extra2 = net;
4365 }
4366
4367 /*
4368 * Make a copy of dev_name, because '.procname' is regarded as const
4369 * by sysctl and we wouldn't want anyone to change it under our feet
4370 * (see SIOCSIFNAME).
4371 */
4372 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4373 if (!t->dev_name)
4374 goto free;
4375
4376 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4377 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4378
4379 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4380 t->addrconf_vars);
4381 if (t->sysctl_header == NULL)
4382 goto free_procname;
4383
4384 p->sysctl = t;
4385 return 0;
4386
4387 free_procname:
4388 kfree(t->dev_name);
4389 free:
4390 kfree(t);
4391 out:
4392 return -ENOBUFS;
4393 }
4394
4395 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4396 {
4397 struct addrconf_sysctl_table *t;
4398
4399 if (p->sysctl == NULL)
4400 return;
4401
4402 t = p->sysctl;
4403 p->sysctl = NULL;
4404 unregister_sysctl_table(t->sysctl_header);
4405 kfree(t->dev_name);
4406 kfree(t);
4407 }
4408
4409 static void addrconf_sysctl_register(struct inet6_dev *idev)
4410 {
4411 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4412 NET_IPV6_NEIGH, "ipv6",
4413 &ndisc_ifinfo_sysctl_change,
4414 ndisc_ifinfo_sysctl_strategy);
4415 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4416 idev->dev->ifindex, idev, &idev->cnf);
4417 }
4418
4419 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4420 {
4421 __addrconf_sysctl_unregister(&idev->cnf);
4422 neigh_sysctl_unregister(idev->nd_parms);
4423 }
4424
4425
4426 #endif
4427
4428 static int addrconf_init_net(struct net *net)
4429 {
4430 int err;
4431 struct ipv6_devconf *all, *dflt;
4432
4433 err = -ENOMEM;
4434 all = &ipv6_devconf;
4435 dflt = &ipv6_devconf_dflt;
4436
4437 if (net != &init_net) {
4438 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4439 if (all == NULL)
4440 goto err_alloc_all;
4441
4442 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4443 if (dflt == NULL)
4444 goto err_alloc_dflt;
4445 } else {
4446 /* these will be inherited by all namespaces */
4447 dflt->autoconf = ipv6_defaults.autoconf;
4448 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4449 }
4450
4451 net->ipv6.devconf_all = all;
4452 net->ipv6.devconf_dflt = dflt;
4453
4454 #ifdef CONFIG_SYSCTL
4455 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4456 NULL, all);
4457 if (err < 0)
4458 goto err_reg_all;
4459
4460 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4461 NULL, dflt);
4462 if (err < 0)
4463 goto err_reg_dflt;
4464 #endif
4465 return 0;
4466
4467 #ifdef CONFIG_SYSCTL
4468 err_reg_dflt:
4469 __addrconf_sysctl_unregister(all);
4470 err_reg_all:
4471 kfree(dflt);
4472 #endif
4473 err_alloc_dflt:
4474 kfree(all);
4475 err_alloc_all:
4476 return err;
4477 }
4478
4479 static void addrconf_exit_net(struct net *net)
4480 {
4481 #ifdef CONFIG_SYSCTL
4482 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4483 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4484 #endif
4485 if (net != &init_net) {
4486 kfree(net->ipv6.devconf_dflt);
4487 kfree(net->ipv6.devconf_all);
4488 }
4489 }
4490
4491 static struct pernet_operations addrconf_ops = {
4492 .init = addrconf_init_net,
4493 .exit = addrconf_exit_net,
4494 };
4495
4496 /*
4497 * Device notifier
4498 */
4499
4500 int register_inet6addr_notifier(struct notifier_block *nb)
4501 {
4502 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4503 }
4504
4505 EXPORT_SYMBOL(register_inet6addr_notifier);
4506
4507 int unregister_inet6addr_notifier(struct notifier_block *nb)
4508 {
4509 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4510 }
4511
4512 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4513
4514 /*
4515 * Init / cleanup code
4516 */
4517
4518 int __init addrconf_init(void)
4519 {
4520 int err;
4521
4522 if ((err = ipv6_addr_label_init()) < 0) {
4523 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4524 err);
4525 return err;
4526 }
4527
4528 register_pernet_subsys(&addrconf_ops);
4529
4530 /* The addrconf netdev notifier requires that loopback_dev
4531 * has it's ipv6 private information allocated and setup
4532 * before it can bring up and give link-local addresses
4533 * to other devices which are up.
4534 *
4535 * Unfortunately, loopback_dev is not necessarily the first
4536 * entry in the global dev_base list of net devices. In fact,
4537 * it is likely to be the very last entry on that list.
4538 * So this causes the notifier registry below to try and
4539 * give link-local addresses to all devices besides loopback_dev
4540 * first, then loopback_dev, which cases all the non-loopback_dev
4541 * devices to fail to get a link-local address.
4542 *
4543 * So, as a temporary fix, allocate the ipv6 structure for
4544 * loopback_dev first by hand.
4545 * Longer term, all of the dependencies ipv6 has upon the loopback
4546 * device and it being up should be removed.
4547 */
4548 rtnl_lock();
4549 if (!ipv6_add_dev(init_net.loopback_dev))
4550 err = -ENOMEM;
4551 rtnl_unlock();
4552 if (err)
4553 goto errlo;
4554
4555 register_netdevice_notifier(&ipv6_dev_notf);
4556
4557 addrconf_verify(0);
4558
4559 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4560 if (err < 0)
4561 goto errout;
4562
4563 /* Only the first call to __rtnl_register can fail */
4564 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4565 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4566 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4567 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4568 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4569
4570 ipv6_addr_label_rtnl_register();
4571
4572 return 0;
4573 errout:
4574 unregister_netdevice_notifier(&ipv6_dev_notf);
4575 errlo:
4576 unregister_pernet_subsys(&addrconf_ops);
4577
4578 return err;
4579 }
4580
4581 void addrconf_cleanup(void)
4582 {
4583 struct inet6_ifaddr *ifa;
4584 struct net_device *dev;
4585 int i;
4586
4587 unregister_netdevice_notifier(&ipv6_dev_notf);
4588 unregister_pernet_subsys(&addrconf_ops);
4589
4590 rtnl_lock();
4591
4592 /* clean dev list */
4593 for_each_netdev(&init_net, dev) {
4594 if (__in6_dev_get(dev) == NULL)
4595 continue;
4596 addrconf_ifdown(dev, 1);
4597 }
4598 addrconf_ifdown(init_net.loopback_dev, 2);
4599
4600 /*
4601 * Check hash table.
4602 */
4603 write_lock_bh(&addrconf_hash_lock);
4604 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4605 for (ifa=inet6_addr_lst[i]; ifa; ) {
4606 struct inet6_ifaddr *bifa;
4607
4608 bifa = ifa;
4609 ifa = ifa->lst_next;
4610 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4611 /* Do not free it; something is wrong.
4612 Now we can investigate it with debugger.
4613 */
4614 }
4615 }
4616 write_unlock_bh(&addrconf_hash_lock);
4617
4618 del_timer(&addr_chk_timer);
4619 rtnl_unlock();
4620 }
Support for the Chinese Samsung S3C2440 based development boards