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MAC80211: Remove unused MAC80211_VERBOSE_SPECT_MGMT_DEBUG.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / addrconf.c
bloba8218bc1806a6c541fdeac42eaf00ee66faf0950
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 -ERESTARTSYS;
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 struct net *net = dev_net(idev->dev);
595 int hash;
596 int err = 0;
597 int addr_type = ipv6_addr_type(addr);
598
599 if (addr_type == IPV6_ADDR_ANY ||
600 addr_type & IPV6_ADDR_MULTICAST ||
601 (!(idev->dev->flags & IFF_LOOPBACK) &&
602 addr_type & IPV6_ADDR_LOOPBACK))
603 return ERR_PTR(-EADDRNOTAVAIL);
604
605 rcu_read_lock_bh();
606 if (idev->dead) {
607 err = -ENODEV; /*XXX*/
608 goto out2;
609 }
610
611 if (idev->cnf.disable_ipv6 || net->ipv6.devconf_all->disable_ipv6) {
612 err = -EACCES;
613 goto out2;
614 }
615
616 write_lock(&addrconf_hash_lock);
617
618 /* Ignore adding duplicate addresses on an interface */
619 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
620 ADBG(("ipv6_add_addr: already assigned\n"));
621 err = -EEXIST;
622 goto out;
623 }
624
625 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
626
627 if (ifa == NULL) {
628 ADBG(("ipv6_add_addr: malloc failed\n"));
629 err = -ENOBUFS;
630 goto out;
631 }
632
633 rt = addrconf_dst_alloc(idev, addr, 0);
634 if (IS_ERR(rt)) {
635 err = PTR_ERR(rt);
636 goto out;
637 }
638
639 ipv6_addr_copy(&ifa->addr, addr);
640
641 spin_lock_init(&ifa->lock);
642 init_timer(&ifa->timer);
643 ifa->timer.data = (unsigned long) ifa;
644 ifa->scope = scope;
645 ifa->prefix_len = pfxlen;
646 ifa->flags = flags | IFA_F_TENTATIVE;
647 ifa->cstamp = ifa->tstamp = jiffies;
648
649 ifa->rt = rt;
650
651 /*
652 * part one of RFC 4429, section 3.3
653 * We should not configure an address as
654 * optimistic if we do not yet know the link
655 * layer address of our nexhop router
656 */
657
658 if (rt->rt6i_nexthop == NULL)
659 ifa->flags &= ~IFA_F_OPTIMISTIC;
660
661 ifa->idev = idev;
662 in6_dev_hold(idev);
663 /* For caller */
664 in6_ifa_hold(ifa);
665
666 /* Add to big hash table */
667 hash = ipv6_addr_hash(addr);
668
669 ifa->lst_next = inet6_addr_lst[hash];
670 inet6_addr_lst[hash] = ifa;
671 in6_ifa_hold(ifa);
672 write_unlock(&addrconf_hash_lock);
673
674 write_lock(&idev->lock);
675 /* Add to inet6_dev unicast addr list. */
676 ipv6_link_dev_addr(idev, ifa);
677
678 #ifdef CONFIG_IPV6_PRIVACY
679 if (ifa->flags&IFA_F_TEMPORARY) {
680 ifa->tmp_next = idev->tempaddr_list;
681 idev->tempaddr_list = ifa;
682 in6_ifa_hold(ifa);
683 }
684 #endif
685
686 in6_ifa_hold(ifa);
687 write_unlock(&idev->lock);
688 out2:
689 rcu_read_unlock_bh();
690
691 if (likely(err == 0))
692 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
693 else {
694 kfree(ifa);
695 ifa = ERR_PTR(err);
696 }
697
698 return ifa;
699 out:
700 write_unlock(&addrconf_hash_lock);
701 goto out2;
702 }
703
704 /* This function wants to get referenced ifp and releases it before return */
705
706 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
707 {
708 struct inet6_ifaddr *ifa, **ifap;
709 struct inet6_dev *idev = ifp->idev;
710 int hash;
711 int deleted = 0, onlink = 0;
712 unsigned long expires = jiffies;
713
714 hash = ipv6_addr_hash(&ifp->addr);
715
716 ifp->dead = 1;
717
718 write_lock_bh(&addrconf_hash_lock);
719 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
720 ifap = &ifa->lst_next) {
721 if (ifa == ifp) {
722 *ifap = ifa->lst_next;
723 __in6_ifa_put(ifp);
724 ifa->lst_next = NULL;
725 break;
726 }
727 }
728 write_unlock_bh(&addrconf_hash_lock);
729
730 write_lock_bh(&idev->lock);
731 #ifdef CONFIG_IPV6_PRIVACY
732 if (ifp->flags&IFA_F_TEMPORARY) {
733 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
734 ifap = &ifa->tmp_next) {
735 if (ifa == ifp) {
736 *ifap = ifa->tmp_next;
737 if (ifp->ifpub) {
738 in6_ifa_put(ifp->ifpub);
739 ifp->ifpub = NULL;
740 }
741 __in6_ifa_put(ifp);
742 ifa->tmp_next = NULL;
743 break;
744 }
745 }
746 }
747 #endif
748
749 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
750 if (ifa == ifp) {
751 *ifap = ifa->if_next;
752 __in6_ifa_put(ifp);
753 ifa->if_next = NULL;
754 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
755 break;
756 deleted = 1;
757 continue;
758 } else if (ifp->flags & IFA_F_PERMANENT) {
759 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
760 ifp->prefix_len)) {
761 if (ifa->flags & IFA_F_PERMANENT) {
762 onlink = 1;
763 if (deleted)
764 break;
765 } else {
766 unsigned long lifetime;
767
768 if (!onlink)
769 onlink = -1;
770
771 spin_lock(&ifa->lock);
772
773 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
774 /*
775 * Note: Because this address is
776 * not permanent, lifetime <
777 * LONG_MAX / HZ here.
778 */
779 if (time_before(expires,
780 ifa->tstamp + lifetime * HZ))
781 expires = ifa->tstamp + lifetime * HZ;
782 spin_unlock(&ifa->lock);
783 }
784 }
785 }
786 ifap = &ifa->if_next;
787 }
788 write_unlock_bh(&idev->lock);
789
790 addrconf_del_timer(ifp);
791
792 ipv6_ifa_notify(RTM_DELADDR, ifp);
793
794 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
795
796 /*
797 * Purge or update corresponding prefix
798 *
799 * 1) we don't purge prefix here if address was not permanent.
800 * prefix is managed by its own lifetime.
801 * 2) if there're no addresses, delete prefix.
802 * 3) if there're still other permanent address(es),
803 * corresponding prefix is still permanent.
804 * 4) otherwise, update prefix lifetime to the
805 * longest valid lifetime among the corresponding
806 * addresses on the device.
807 * Note: subsequent RA will update lifetime.
808 *
809 * --yoshfuji
810 */
811 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
812 struct in6_addr prefix;
813 struct rt6_info *rt;
814 struct net *net = dev_net(ifp->idev->dev);
815 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
816 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
817
818 if (rt && addrconf_is_prefix_route(rt)) {
819 if (onlink == 0) {
820 ip6_del_rt(rt);
821 rt = NULL;
822 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
823 rt->rt6i_expires = expires;
824 rt->rt6i_flags |= RTF_EXPIRES;
825 }
826 }
827 dst_release(&rt->u.dst);
828 }
829
830 in6_ifa_put(ifp);
831 }
832
833 #ifdef CONFIG_IPV6_PRIVACY
834 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
835 {
836 struct inet6_dev *idev = ifp->idev;
837 struct in6_addr addr, *tmpaddr;
838 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
839 unsigned long regen_advance;
840 int tmp_plen;
841 int ret = 0;
842 int max_addresses;
843 u32 addr_flags;
844
845 write_lock(&idev->lock);
846 if (ift) {
847 spin_lock_bh(&ift->lock);
848 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
849 spin_unlock_bh(&ift->lock);
850 tmpaddr = &addr;
851 } else {
852 tmpaddr = NULL;
853 }
854 retry:
855 in6_dev_hold(idev);
856 if (idev->cnf.use_tempaddr <= 0) {
857 write_unlock(&idev->lock);
858 printk(KERN_INFO
859 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
860 in6_dev_put(idev);
861 ret = -1;
862 goto out;
863 }
864 spin_lock_bh(&ifp->lock);
865 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
866 idev->cnf.use_tempaddr = -1; /*XXX*/
867 spin_unlock_bh(&ifp->lock);
868 write_unlock(&idev->lock);
869 printk(KERN_WARNING
870 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
871 in6_dev_put(idev);
872 ret = -1;
873 goto out;
874 }
875 in6_ifa_hold(ifp);
876 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
877 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
878 spin_unlock_bh(&ifp->lock);
879 write_unlock(&idev->lock);
880 printk(KERN_WARNING
881 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
882 in6_ifa_put(ifp);
883 in6_dev_put(idev);
884 ret = -1;
885 goto out;
886 }
887 memcpy(&addr.s6_addr[8], idev->rndid, 8);
888 tmp_valid_lft = min_t(__u32,
889 ifp->valid_lft,
890 idev->cnf.temp_valid_lft);
891 tmp_prefered_lft = min_t(__u32,
892 ifp->prefered_lft,
893 idev->cnf.temp_prefered_lft - desync_factor / HZ);
894 tmp_plen = ifp->prefix_len;
895 max_addresses = idev->cnf.max_addresses;
896 tmp_cstamp = ifp->cstamp;
897 tmp_tstamp = ifp->tstamp;
898 spin_unlock_bh(&ifp->lock);
899
900 regen_advance = idev->cnf.regen_max_retry *
901 idev->cnf.dad_transmits *
902 idev->nd_parms->retrans_time / HZ;
903 write_unlock(&idev->lock);
904
905 /* A temporary address is created only if this calculated Preferred
906 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
907 * an implementation must not create a temporary address with a zero
908 * Preferred Lifetime.
909 */
910 if (tmp_prefered_lft <= regen_advance) {
911 in6_ifa_put(ifp);
912 in6_dev_put(idev);
913 ret = -1;
914 goto out;
915 }
916
917 addr_flags = IFA_F_TEMPORARY;
918 /* set in addrconf_prefix_rcv() */
919 if (ifp->flags & IFA_F_OPTIMISTIC)
920 addr_flags |= IFA_F_OPTIMISTIC;
921
922 ift = !max_addresses ||
923 ipv6_count_addresses(idev) < max_addresses ?
924 ipv6_add_addr(idev, &addr, tmp_plen,
925 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
926 addr_flags) : NULL;
927 if (!ift || IS_ERR(ift)) {
928 in6_ifa_put(ifp);
929 in6_dev_put(idev);
930 printk(KERN_INFO
931 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
932 tmpaddr = &addr;
933 write_lock(&idev->lock);
934 goto retry;
935 }
936
937 spin_lock_bh(&ift->lock);
938 ift->ifpub = ifp;
939 ift->valid_lft = tmp_valid_lft;
940 ift->prefered_lft = tmp_prefered_lft;
941 ift->cstamp = tmp_cstamp;
942 ift->tstamp = tmp_tstamp;
943 spin_unlock_bh(&ift->lock);
944
945 addrconf_dad_start(ift, 0);
946 in6_ifa_put(ift);
947 in6_dev_put(idev);
948 out:
949 return ret;
950 }
951 #endif
952
953 /*
954 * Choose an appropriate source address (RFC3484)
955 */
956 enum {
957 IPV6_SADDR_RULE_INIT = 0,
958 IPV6_SADDR_RULE_LOCAL,
959 IPV6_SADDR_RULE_SCOPE,
960 IPV6_SADDR_RULE_PREFERRED,
961 #ifdef CONFIG_IPV6_MIP6
962 IPV6_SADDR_RULE_HOA,
963 #endif
964 IPV6_SADDR_RULE_OIF,
965 IPV6_SADDR_RULE_LABEL,
966 #ifdef CONFIG_IPV6_PRIVACY
967 IPV6_SADDR_RULE_PRIVACY,
968 #endif
969 IPV6_SADDR_RULE_ORCHID,
970 IPV6_SADDR_RULE_PREFIX,
971 IPV6_SADDR_RULE_MAX
972 };
973
974 struct ipv6_saddr_score {
975 int rule;
976 int addr_type;
977 struct inet6_ifaddr *ifa;
978 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
979 int scopedist;
980 int matchlen;
981 };
982
983 struct ipv6_saddr_dst {
984 const struct in6_addr *addr;
985 int ifindex;
986 int scope;
987 int label;
988 unsigned int prefs;
989 };
990
991 static inline int ipv6_saddr_preferred(int type)
992 {
993 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
994 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
995 return 1;
996 return 0;
997 }
998
999 static int ipv6_get_saddr_eval(struct net *net,
1000 struct ipv6_saddr_score *score,
1001 struct ipv6_saddr_dst *dst,
1002 int i)
1003 {
1004 int ret;
1005
1006 if (i <= score->rule) {
1007 switch (i) {
1008 case IPV6_SADDR_RULE_SCOPE:
1009 ret = score->scopedist;
1010 break;
1011 case IPV6_SADDR_RULE_PREFIX:
1012 ret = score->matchlen;
1013 break;
1014 default:
1015 ret = !!test_bit(i, score->scorebits);
1016 }
1017 goto out;
1018 }
1019
1020 switch (i) {
1021 case IPV6_SADDR_RULE_INIT:
1022 /* Rule 0: remember if hiscore is not ready yet */
1023 ret = !!score->ifa;
1024 break;
1025 case IPV6_SADDR_RULE_LOCAL:
1026 /* Rule 1: Prefer same address */
1027 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1028 break;
1029 case IPV6_SADDR_RULE_SCOPE:
1030 /* Rule 2: Prefer appropriate scope
1031 *
1032 * ret
1033 * ^
1034 * -1 | d 15
1035 * ---+--+-+---> scope
1036 * |
1037 * | d is scope of the destination.
1038 * B-d | \
1039 * | \ <- smaller scope is better if
1040 * B-15 | \ if scope is enough for destinaion.
1041 * | ret = B - scope (-1 <= scope >= d <= 15).
1042 * d-C-1 | /
1043 * |/ <- greater is better
1044 * -C / if scope is not enough for destination.
1045 * /| ret = scope - C (-1 <= d < scope <= 15).
1046 *
1047 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1048 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1049 * Assume B = 0 and we get C > 29.
1050 */
1051 ret = __ipv6_addr_src_scope(score->addr_type);
1052 if (ret >= dst->scope)
1053 ret = -ret;
1054 else
1055 ret -= 128; /* 30 is enough */
1056 score->scopedist = ret;
1057 break;
1058 case IPV6_SADDR_RULE_PREFERRED:
1059 /* Rule 3: Avoid deprecated and optimistic addresses */
1060 ret = ipv6_saddr_preferred(score->addr_type) ||
1061 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1062 break;
1063 #ifdef CONFIG_IPV6_MIP6
1064 case IPV6_SADDR_RULE_HOA:
1065 {
1066 /* Rule 4: Prefer home address */
1067 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1068 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1069 break;
1070 }
1071 #endif
1072 case IPV6_SADDR_RULE_OIF:
1073 /* Rule 5: Prefer outgoing interface */
1074 ret = (!dst->ifindex ||
1075 dst->ifindex == score->ifa->idev->dev->ifindex);
1076 break;
1077 case IPV6_SADDR_RULE_LABEL:
1078 /* Rule 6: Prefer matching label */
1079 ret = ipv6_addr_label(net,
1080 &score->ifa->addr, score->addr_type,
1081 score->ifa->idev->dev->ifindex) == dst->label;
1082 break;
1083 #ifdef CONFIG_IPV6_PRIVACY
1084 case IPV6_SADDR_RULE_PRIVACY:
1085 {
1086 /* Rule 7: Prefer public address
1087 * Note: prefer temprary address if use_tempaddr >= 2
1088 */
1089 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1090 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1091 score->ifa->idev->cnf.use_tempaddr >= 2;
1092 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1093 break;
1094 }
1095 #endif
1096 case IPV6_SADDR_RULE_ORCHID:
1097 /* Rule 8-: Prefer ORCHID vs ORCHID or
1098 * non-ORCHID vs non-ORCHID
1099 */
1100 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1101 ipv6_addr_orchid(dst->addr));
1102 break;
1103 case IPV6_SADDR_RULE_PREFIX:
1104 /* Rule 8: Use longest matching prefix */
1105 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1106 dst->addr);
1107 break;
1108 default:
1109 ret = 0;
1110 }
1111
1112 if (ret)
1113 __set_bit(i, score->scorebits);
1114 score->rule = i;
1115 out:
1116 return ret;
1117 }
1118
1119 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1120 const struct in6_addr *daddr, unsigned int prefs,
1121 struct in6_addr *saddr)
1122 {
1123 struct ipv6_saddr_score scores[2],
1124 *score = &scores[0], *hiscore = &scores[1];
1125 struct ipv6_saddr_dst dst;
1126 struct net_device *dev;
1127 int dst_type;
1128
1129 dst_type = __ipv6_addr_type(daddr);
1130 dst.addr = daddr;
1131 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1132 dst.scope = __ipv6_addr_src_scope(dst_type);
1133 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1134 dst.prefs = prefs;
1135
1136 hiscore->rule = -1;
1137 hiscore->ifa = NULL;
1138
1139 read_lock(&dev_base_lock);
1140 rcu_read_lock();
1141
1142 for_each_netdev(net, dev) {
1143 struct inet6_dev *idev;
1144
1145 /* Candidate Source Address (section 4)
1146 * - multicast and link-local destination address,
1147 * the set of candidate source address MUST only
1148 * include addresses assigned to interfaces
1149 * belonging to the same link as the outgoing
1150 * interface.
1151 * (- For site-local destination addresses, the
1152 * set of candidate source addresses MUST only
1153 * include addresses assigned to interfaces
1154 * belonging to the same site as the outgoing
1155 * interface.)
1156 */
1157 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1158 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1159 dst.ifindex && dev->ifindex != dst.ifindex)
1160 continue;
1161
1162 idev = __in6_dev_get(dev);
1163 if (!idev)
1164 continue;
1165
1166 read_lock_bh(&idev->lock);
1167 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1168 int i;
1169
1170 /*
1171 * - Tentative Address (RFC2462 section 5.4)
1172 * - A tentative address is not considered
1173 * "assigned to an interface" in the traditional
1174 * sense, unless it is also flagged as optimistic.
1175 * - Candidate Source Address (section 4)
1176 * - In any case, anycast addresses, multicast
1177 * addresses, and the unspecified address MUST
1178 * NOT be included in a candidate set.
1179 */
1180 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1181 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1182 continue;
1183
1184 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1185
1186 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1187 score->addr_type & IPV6_ADDR_MULTICAST)) {
1188 LIMIT_NETDEBUG(KERN_DEBUG
1189 "ADDRCONF: unspecified / multicast address "
1190 "assigned as unicast address on %s",
1191 dev->name);
1192 continue;
1193 }
1194
1195 score->rule = -1;
1196 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1197
1198 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1199 int minihiscore, miniscore;
1200
1201 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1202 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1203
1204 if (minihiscore > miniscore) {
1205 if (i == IPV6_SADDR_RULE_SCOPE &&
1206 score->scopedist > 0) {
1207 /*
1208 * special case:
1209 * each remaining entry
1210 * has too small (not enough)
1211 * scope, because ifa entries
1212 * are sorted by their scope
1213 * values.
1214 */
1215 goto try_nextdev;
1216 }
1217 break;
1218 } else if (minihiscore < miniscore) {
1219 if (hiscore->ifa)
1220 in6_ifa_put(hiscore->ifa);
1221
1222 in6_ifa_hold(score->ifa);
1223
1224 swap(hiscore, score);
1225
1226 /* restore our iterator */
1227 score->ifa = hiscore->ifa;
1228
1229 break;
1230 }
1231 }
1232 }
1233 try_nextdev:
1234 read_unlock_bh(&idev->lock);
1235 }
1236 rcu_read_unlock();
1237 read_unlock(&dev_base_lock);
1238
1239 if (!hiscore->ifa)
1240 return -EADDRNOTAVAIL;
1241
1242 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1243 in6_ifa_put(hiscore->ifa);
1244 return 0;
1245 }
1246
1247 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1248
1249 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1250 unsigned char banned_flags)
1251 {
1252 struct inet6_dev *idev;
1253 int err = -EADDRNOTAVAIL;
1254
1255 rcu_read_lock();
1256 if ((idev = __in6_dev_get(dev)) != NULL) {
1257 struct inet6_ifaddr *ifp;
1258
1259 read_lock_bh(&idev->lock);
1260 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1261 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1262 ipv6_addr_copy(addr, &ifp->addr);
1263 err = 0;
1264 break;
1265 }
1266 }
1267 read_unlock_bh(&idev->lock);
1268 }
1269 rcu_read_unlock();
1270 return err;
1271 }
1272
1273 static int ipv6_count_addresses(struct inet6_dev *idev)
1274 {
1275 int cnt = 0;
1276 struct inet6_ifaddr *ifp;
1277
1278 read_lock_bh(&idev->lock);
1279 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1280 cnt++;
1281 read_unlock_bh(&idev->lock);
1282 return cnt;
1283 }
1284
1285 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1286 struct net_device *dev, int strict)
1287 {
1288 struct inet6_ifaddr * ifp;
1289 u8 hash = ipv6_addr_hash(addr);
1290
1291 read_lock_bh(&addrconf_hash_lock);
1292 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1293 if (!net_eq(dev_net(ifp->idev->dev), net))
1294 continue;
1295 if (ipv6_addr_equal(&ifp->addr, addr) &&
1296 !(ifp->flags&IFA_F_TENTATIVE)) {
1297 if (dev == NULL || ifp->idev->dev == dev ||
1298 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1299 break;
1300 }
1301 }
1302 read_unlock_bh(&addrconf_hash_lock);
1303 return ifp != NULL;
1304 }
1305 EXPORT_SYMBOL(ipv6_chk_addr);
1306
1307 static
1308 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1309 struct net_device *dev)
1310 {
1311 struct inet6_ifaddr * ifp;
1312 u8 hash = ipv6_addr_hash(addr);
1313
1314 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1315 if (!net_eq(dev_net(ifp->idev->dev), net))
1316 continue;
1317 if (ipv6_addr_equal(&ifp->addr, addr)) {
1318 if (dev == NULL || ifp->idev->dev == dev)
1319 break;
1320 }
1321 }
1322 return ifp != NULL;
1323 }
1324
1325 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1326 {
1327 struct inet6_dev *idev;
1328 struct inet6_ifaddr *ifa;
1329 int onlink;
1330
1331 onlink = 0;
1332 rcu_read_lock();
1333 idev = __in6_dev_get(dev);
1334 if (idev) {
1335 read_lock_bh(&idev->lock);
1336 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1337 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1338 ifa->prefix_len);
1339 if (onlink)
1340 break;
1341 }
1342 read_unlock_bh(&idev->lock);
1343 }
1344 rcu_read_unlock();
1345 return onlink;
1346 }
1347
1348 EXPORT_SYMBOL(ipv6_chk_prefix);
1349
1350 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1351 struct net_device *dev, int strict)
1352 {
1353 struct inet6_ifaddr * ifp;
1354 u8 hash = ipv6_addr_hash(addr);
1355
1356 read_lock_bh(&addrconf_hash_lock);
1357 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1358 if (!net_eq(dev_net(ifp->idev->dev), net))
1359 continue;
1360 if (ipv6_addr_equal(&ifp->addr, addr)) {
1361 if (dev == NULL || ifp->idev->dev == dev ||
1362 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1363 in6_ifa_hold(ifp);
1364 break;
1365 }
1366 }
1367 }
1368 read_unlock_bh(&addrconf_hash_lock);
1369
1370 return ifp;
1371 }
1372
1373 /* Gets referenced address, destroys ifaddr */
1374
1375 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1376 {
1377 if (ifp->flags&IFA_F_PERMANENT) {
1378 spin_lock_bh(&ifp->lock);
1379 addrconf_del_timer(ifp);
1380 ifp->flags |= IFA_F_TENTATIVE;
1381 spin_unlock_bh(&ifp->lock);
1382 in6_ifa_put(ifp);
1383 #ifdef CONFIG_IPV6_PRIVACY
1384 } else if (ifp->flags&IFA_F_TEMPORARY) {
1385 struct inet6_ifaddr *ifpub;
1386 spin_lock_bh(&ifp->lock);
1387 ifpub = ifp->ifpub;
1388 if (ifpub) {
1389 in6_ifa_hold(ifpub);
1390 spin_unlock_bh(&ifp->lock);
1391 ipv6_create_tempaddr(ifpub, ifp);
1392 in6_ifa_put(ifpub);
1393 } else {
1394 spin_unlock_bh(&ifp->lock);
1395 }
1396 ipv6_del_addr(ifp);
1397 #endif
1398 } else
1399 ipv6_del_addr(ifp);
1400 }
1401
1402 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1403 {
1404 struct inet6_dev *idev = ifp->idev;
1405
1406 if (net_ratelimit())
1407 printk(KERN_INFO "%s: IPv6 duplicate address detected!\n",
1408 ifp->idev->dev->name);
1409
1410 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1411 struct in6_addr addr;
1412
1413 addr.s6_addr32[0] = htonl(0xfe800000);
1414 addr.s6_addr32[1] = 0;
1415
1416 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1417 ipv6_addr_equal(&ifp->addr, &addr)) {
1418 /* DAD failed for link-local based on MAC address */
1419 idev->cnf.disable_ipv6 = 1;
1420
1421 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1422 ifp->idev->dev->name);
1423 }
1424 }
1425
1426 addrconf_dad_stop(ifp);
1427 }
1428
1429 /* Join to solicited addr multicast group. */
1430
1431 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1432 {
1433 struct in6_addr maddr;
1434
1435 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1436 return;
1437
1438 addrconf_addr_solict_mult(addr, &maddr);
1439 ipv6_dev_mc_inc(dev, &maddr);
1440 }
1441
1442 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1443 {
1444 struct in6_addr maddr;
1445
1446 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1447 return;
1448
1449 addrconf_addr_solict_mult(addr, &maddr);
1450 __ipv6_dev_mc_dec(idev, &maddr);
1451 }
1452
1453 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1454 {
1455 struct in6_addr addr;
1456 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1457 if (ipv6_addr_any(&addr))
1458 return;
1459 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1460 }
1461
1462 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1463 {
1464 struct in6_addr addr;
1465 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1466 if (ipv6_addr_any(&addr))
1467 return;
1468 __ipv6_dev_ac_dec(ifp->idev, &addr);
1469 }
1470
1471 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1472 {
1473 if (dev->addr_len != ETH_ALEN)
1474 return -1;
1475 memcpy(eui, dev->dev_addr, 3);
1476 memcpy(eui + 5, dev->dev_addr + 3, 3);
1477
1478 /*
1479 * The zSeries OSA network cards can be shared among various
1480 * OS instances, but the OSA cards have only one MAC address.
1481 * This leads to duplicate address conflicts in conjunction
1482 * with IPv6 if more than one instance uses the same card.
1483 *
1484 * The driver for these cards can deliver a unique 16-bit
1485 * identifier for each instance sharing the same card. It is
1486 * placed instead of 0xFFFE in the interface identifier. The
1487 * "u" bit of the interface identifier is not inverted in this
1488 * case. Hence the resulting interface identifier has local
1489 * scope according to RFC2373.
1490 */
1491 if (dev->dev_id) {
1492 eui[3] = (dev->dev_id >> 8) & 0xFF;
1493 eui[4] = dev->dev_id & 0xFF;
1494 } else {
1495 eui[3] = 0xFF;
1496 eui[4] = 0xFE;
1497 eui[0] ^= 2;
1498 }
1499 return 0;
1500 }
1501
1502 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1503 {
1504 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1505 if (dev->addr_len != ARCNET_ALEN)
1506 return -1;
1507 memset(eui, 0, 7);
1508 eui[7] = *(u8*)dev->dev_addr;
1509 return 0;
1510 }
1511
1512 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1513 {
1514 if (dev->addr_len != INFINIBAND_ALEN)
1515 return -1;
1516 memcpy(eui, dev->dev_addr + 12, 8);
1517 eui[0] |= 2;
1518 return 0;
1519 }
1520
1521 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1522 {
1523 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1524 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1525 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1526 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1527 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1528 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1529 eui[1] = 0;
1530 eui[2] = 0x5E;
1531 eui[3] = 0xFE;
1532 memcpy(eui + 4, &addr, 4);
1533 return 0;
1534 }
1535 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1536
1537 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1538 {
1539 if (dev->priv_flags & IFF_ISATAP)
1540 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1541 return -1;
1542 }
1543
1544 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1545 {
1546 switch (dev->type) {
1547 case ARPHRD_ETHER:
1548 case ARPHRD_FDDI:
1549 case ARPHRD_IEEE802_TR:
1550 return addrconf_ifid_eui48(eui, dev);
1551 case ARPHRD_ARCNET:
1552 return addrconf_ifid_arcnet(eui, dev);
1553 case ARPHRD_INFINIBAND:
1554 return addrconf_ifid_infiniband(eui, dev);
1555 case ARPHRD_SIT:
1556 return addrconf_ifid_sit(eui, dev);
1557 }
1558 return -1;
1559 }
1560
1561 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1562 {
1563 int err = -1;
1564 struct inet6_ifaddr *ifp;
1565
1566 read_lock_bh(&idev->lock);
1567 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1568 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1569 memcpy(eui, ifp->addr.s6_addr+8, 8);
1570 err = 0;
1571 break;
1572 }
1573 }
1574 read_unlock_bh(&idev->lock);
1575 return err;
1576 }
1577
1578 #ifdef CONFIG_IPV6_PRIVACY
1579 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1580 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1581 {
1582 regen:
1583 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1584 idev->rndid[0] &= ~0x02;
1585
1586 /*
1587 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1588 * check if generated address is not inappropriate
1589 *
1590 * - Reserved subnet anycast (RFC 2526)
1591 * 11111101 11....11 1xxxxxxx
1592 * - ISATAP (RFC4214) 6.1
1593 * 00-00-5E-FE-xx-xx-xx-xx
1594 * - value 0
1595 * - XXX: already assigned to an address on the device
1596 */
1597 if (idev->rndid[0] == 0xfd &&
1598 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1599 (idev->rndid[7]&0x80))
1600 goto regen;
1601 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1602 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1603 goto regen;
1604 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1605 goto regen;
1606 }
1607
1608 return 0;
1609 }
1610
1611 static void ipv6_regen_rndid(unsigned long data)
1612 {
1613 struct inet6_dev *idev = (struct inet6_dev *) data;
1614 unsigned long expires;
1615
1616 rcu_read_lock_bh();
1617 write_lock_bh(&idev->lock);
1618
1619 if (idev->dead)
1620 goto out;
1621
1622 if (__ipv6_regen_rndid(idev) < 0)
1623 goto out;
1624
1625 expires = jiffies +
1626 idev->cnf.temp_prefered_lft * HZ -
1627 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1628 if (time_before(expires, jiffies)) {
1629 printk(KERN_WARNING
1630 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1631 idev->dev->name);
1632 goto out;
1633 }
1634
1635 if (!mod_timer(&idev->regen_timer, expires))
1636 in6_dev_hold(idev);
1637
1638 out:
1639 write_unlock_bh(&idev->lock);
1640 rcu_read_unlock_bh();
1641 in6_dev_put(idev);
1642 }
1643
1644 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1645 int ret = 0;
1646
1647 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1648 ret = __ipv6_regen_rndid(idev);
1649 return ret;
1650 }
1651 #endif
1652
1653 /*
1654 * Add prefix route.
1655 */
1656
1657 static void
1658 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1659 unsigned long expires, u32 flags)
1660 {
1661 struct fib6_config cfg = {
1662 .fc_table = RT6_TABLE_PREFIX,
1663 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1664 .fc_ifindex = dev->ifindex,
1665 .fc_expires = expires,
1666 .fc_dst_len = plen,
1667 .fc_flags = RTF_UP | flags,
1668 .fc_nlinfo.nl_net = dev_net(dev),
1669 .fc_protocol = RTPROT_KERNEL,
1670 };
1671
1672 ipv6_addr_copy(&cfg.fc_dst, pfx);
1673
1674 /* Prevent useless cloning on PtP SIT.
1675 This thing is done here expecting that the whole
1676 class of non-broadcast devices need not cloning.
1677 */
1678 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1679 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1680 cfg.fc_flags |= RTF_NONEXTHOP;
1681 #endif
1682
1683 ip6_route_add(&cfg);
1684 }
1685
1686 /* Create "default" multicast route to the interface */
1687
1688 static void addrconf_add_mroute(struct net_device *dev)
1689 {
1690 struct fib6_config cfg = {
1691 .fc_table = RT6_TABLE_LOCAL,
1692 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1693 .fc_ifindex = dev->ifindex,
1694 .fc_dst_len = 8,
1695 .fc_flags = RTF_UP,
1696 .fc_nlinfo.nl_net = dev_net(dev),
1697 };
1698
1699 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1700
1701 ip6_route_add(&cfg);
1702 }
1703
1704 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1705 static void sit_route_add(struct net_device *dev)
1706 {
1707 struct fib6_config cfg = {
1708 .fc_table = RT6_TABLE_MAIN,
1709 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1710 .fc_ifindex = dev->ifindex,
1711 .fc_dst_len = 96,
1712 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1713 .fc_nlinfo.nl_net = dev_net(dev),
1714 };
1715
1716 /* prefix length - 96 bits "::d.d.d.d" */
1717 ip6_route_add(&cfg);
1718 }
1719 #endif
1720
1721 static void addrconf_add_lroute(struct net_device *dev)
1722 {
1723 struct in6_addr addr;
1724
1725 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1726 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1727 }
1728
1729 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1730 {
1731 struct inet6_dev *idev;
1732
1733 ASSERT_RTNL();
1734
1735 if ((idev = ipv6_find_idev(dev)) == NULL)
1736 return NULL;
1737
1738 /* Add default multicast route */
1739 addrconf_add_mroute(dev);
1740
1741 /* Add link local route */
1742 addrconf_add_lroute(dev);
1743 return idev;
1744 }
1745
1746 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1747 {
1748 struct prefix_info *pinfo;
1749 __u32 valid_lft;
1750 __u32 prefered_lft;
1751 int addr_type;
1752 struct inet6_dev *in6_dev;
1753
1754 pinfo = (struct prefix_info *) opt;
1755
1756 if (len < sizeof(struct prefix_info)) {
1757 ADBG(("addrconf: prefix option too short\n"));
1758 return;
1759 }
1760
1761 /*
1762 * Validation checks ([ADDRCONF], page 19)
1763 */
1764
1765 addr_type = ipv6_addr_type(&pinfo->prefix);
1766
1767 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1768 return;
1769
1770 valid_lft = ntohl(pinfo->valid);
1771 prefered_lft = ntohl(pinfo->prefered);
1772
1773 if (prefered_lft > valid_lft) {
1774 if (net_ratelimit())
1775 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1776 return;
1777 }
1778
1779 in6_dev = in6_dev_get(dev);
1780
1781 if (in6_dev == NULL) {
1782 if (net_ratelimit())
1783 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1784 return;
1785 }
1786
1787 /*
1788 * Two things going on here:
1789 * 1) Add routes for on-link prefixes
1790 * 2) Configure prefixes with the auto flag set
1791 */
1792
1793 if (pinfo->onlink) {
1794 struct rt6_info *rt;
1795 unsigned long rt_expires;
1796
1797 /* Avoid arithmetic overflow. Really, we could
1798 * save rt_expires in seconds, likely valid_lft,
1799 * but it would require division in fib gc, that it
1800 * not good.
1801 */
1802 if (HZ > USER_HZ)
1803 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1804 else
1805 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1806
1807 if (addrconf_finite_timeout(rt_expires))
1808 rt_expires *= HZ;
1809
1810 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
1811 dev->ifindex, 1);
1812
1813 if (rt && addrconf_is_prefix_route(rt)) {
1814 /* Autoconf prefix route */
1815 if (valid_lft == 0) {
1816 ip6_del_rt(rt);
1817 rt = NULL;
1818 } else if (addrconf_finite_timeout(rt_expires)) {
1819 /* not infinity */
1820 rt->rt6i_expires = jiffies + rt_expires;
1821 rt->rt6i_flags |= RTF_EXPIRES;
1822 } else {
1823 rt->rt6i_flags &= ~RTF_EXPIRES;
1824 rt->rt6i_expires = 0;
1825 }
1826 } else if (valid_lft) {
1827 clock_t expires = 0;
1828 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1829 if (addrconf_finite_timeout(rt_expires)) {
1830 /* not infinity */
1831 flags |= RTF_EXPIRES;
1832 expires = jiffies_to_clock_t(rt_expires);
1833 }
1834 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1835 dev, expires, flags);
1836 }
1837 if (rt)
1838 dst_release(&rt->u.dst);
1839 }
1840
1841 /* Try to figure out our local address for this prefix */
1842
1843 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1844 struct inet6_ifaddr * ifp;
1845 struct in6_addr addr;
1846 int create = 0, update_lft = 0;
1847 struct net *net = dev_net(dev);
1848
1849 if (pinfo->prefix_len == 64) {
1850 memcpy(&addr, &pinfo->prefix, 8);
1851 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1852 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1853 in6_dev_put(in6_dev);
1854 return;
1855 }
1856 goto ok;
1857 }
1858 if (net_ratelimit())
1859 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1860 pinfo->prefix_len);
1861 in6_dev_put(in6_dev);
1862 return;
1863
1864 ok:
1865
1866 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1867
1868 if (ifp == NULL && valid_lft) {
1869 int max_addresses = in6_dev->cnf.max_addresses;
1870 u32 addr_flags = 0;
1871
1872 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1873 if (in6_dev->cnf.optimistic_dad &&
1874 !net->ipv6.devconf_all->forwarding)
1875 addr_flags = IFA_F_OPTIMISTIC;
1876 #endif
1877
1878 /* Do not allow to create too much of autoconfigured
1879 * addresses; this would be too easy way to crash kernel.
1880 */
1881 if (!max_addresses ||
1882 ipv6_count_addresses(in6_dev) < max_addresses)
1883 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1884 addr_type&IPV6_ADDR_SCOPE_MASK,
1885 addr_flags);
1886
1887 if (!ifp || IS_ERR(ifp)) {
1888 in6_dev_put(in6_dev);
1889 return;
1890 }
1891
1892 update_lft = create = 1;
1893 ifp->cstamp = jiffies;
1894 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1895 }
1896
1897 if (ifp) {
1898 int flags;
1899 unsigned long now;
1900 #ifdef CONFIG_IPV6_PRIVACY
1901 struct inet6_ifaddr *ift;
1902 #endif
1903 u32 stored_lft;
1904
1905 /* update lifetime (RFC2462 5.5.3 e) */
1906 spin_lock(&ifp->lock);
1907 now = jiffies;
1908 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1909 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1910 else
1911 stored_lft = 0;
1912 if (!update_lft && stored_lft) {
1913 if (valid_lft > MIN_VALID_LIFETIME ||
1914 valid_lft > stored_lft)
1915 update_lft = 1;
1916 else if (stored_lft <= MIN_VALID_LIFETIME) {
1917 /* valid_lft <= stored_lft is always true */
1918 /* XXX: IPsec */
1919 update_lft = 0;
1920 } else {
1921 valid_lft = MIN_VALID_LIFETIME;
1922 if (valid_lft < prefered_lft)
1923 prefered_lft = valid_lft;
1924 update_lft = 1;
1925 }
1926 }
1927
1928 if (update_lft) {
1929 ifp->valid_lft = valid_lft;
1930 ifp->prefered_lft = prefered_lft;
1931 ifp->tstamp = now;
1932 flags = ifp->flags;
1933 ifp->flags &= ~IFA_F_DEPRECATED;
1934 spin_unlock(&ifp->lock);
1935
1936 if (!(flags&IFA_F_TENTATIVE))
1937 ipv6_ifa_notify(0, ifp);
1938 } else
1939 spin_unlock(&ifp->lock);
1940
1941 #ifdef CONFIG_IPV6_PRIVACY
1942 read_lock_bh(&in6_dev->lock);
1943 /* update all temporary addresses in the list */
1944 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1945 /*
1946 * When adjusting the lifetimes of an existing
1947 * temporary address, only lower the lifetimes.
1948 * Implementations must not increase the
1949 * lifetimes of an existing temporary address
1950 * when processing a Prefix Information Option.
1951 */
1952 if (ifp != ift->ifpub)
1953 continue;
1954
1955 spin_lock(&ift->lock);
1956 flags = ift->flags;
1957 if (ift->valid_lft > valid_lft &&
1958 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1959 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1960 if (ift->prefered_lft > prefered_lft &&
1961 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1962 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1963 spin_unlock(&ift->lock);
1964 if (!(flags&IFA_F_TENTATIVE))
1965 ipv6_ifa_notify(0, ift);
1966 }
1967
1968 if (create && in6_dev->cnf.use_tempaddr > 0) {
1969 /*
1970 * When a new public address is created as described in [ADDRCONF],
1971 * also create a new temporary address.
1972 */
1973 read_unlock_bh(&in6_dev->lock);
1974 ipv6_create_tempaddr(ifp, NULL);
1975 } else {
1976 read_unlock_bh(&in6_dev->lock);
1977 }
1978 #endif
1979 in6_ifa_put(ifp);
1980 addrconf_verify(0);
1981 }
1982 }
1983 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1984 in6_dev_put(in6_dev);
1985 }
1986
1987 /*
1988 * Set destination address.
1989 * Special case for SIT interfaces where we create a new "virtual"
1990 * device.
1991 */
1992 int addrconf_set_dstaddr(struct net *net, void __user *arg)
1993 {
1994 struct in6_ifreq ireq;
1995 struct net_device *dev;
1996 int err = -EINVAL;
1997
1998 rtnl_lock();
1999
2000 err = -EFAULT;
2001 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2002 goto err_exit;
2003
2004 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2005
2006 err = -ENODEV;
2007 if (dev == NULL)
2008 goto err_exit;
2009
2010 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2011 if (dev->type == ARPHRD_SIT) {
2012 const struct net_device_ops *ops = dev->netdev_ops;
2013 struct ifreq ifr;
2014 struct ip_tunnel_parm p;
2015
2016 err = -EADDRNOTAVAIL;
2017 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2018 goto err_exit;
2019
2020 memset(&p, 0, sizeof(p));
2021 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2022 p.iph.saddr = 0;
2023 p.iph.version = 4;
2024 p.iph.ihl = 5;
2025 p.iph.protocol = IPPROTO_IPV6;
2026 p.iph.ttl = 64;
2027 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2028
2029 if (ops->ndo_do_ioctl) {
2030 mm_segment_t oldfs = get_fs();
2031
2032 set_fs(KERNEL_DS);
2033 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2034 set_fs(oldfs);
2035 } else
2036 err = -EOPNOTSUPP;
2037
2038 if (err == 0) {
2039 err = -ENOBUFS;
2040 dev = __dev_get_by_name(net, p.name);
2041 if (!dev)
2042 goto err_exit;
2043 err = dev_open(dev);
2044 }
2045 }
2046 #endif
2047
2048 err_exit:
2049 rtnl_unlock();
2050 return err;
2051 }
2052
2053 /*
2054 * Manual configuration of address on an interface
2055 */
2056 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2057 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2058 __u32 valid_lft)
2059 {
2060 struct inet6_ifaddr *ifp;
2061 struct inet6_dev *idev;
2062 struct net_device *dev;
2063 int scope;
2064 u32 flags;
2065 clock_t expires;
2066 unsigned long timeout;
2067
2068 ASSERT_RTNL();
2069
2070 if (plen > 128)
2071 return -EINVAL;
2072
2073 /* check the lifetime */
2074 if (!valid_lft || prefered_lft > valid_lft)
2075 return -EINVAL;
2076
2077 dev = __dev_get_by_index(net, ifindex);
2078 if (!dev)
2079 return -ENODEV;
2080
2081 if ((idev = addrconf_add_dev(dev)) == NULL)
2082 return -ENOBUFS;
2083
2084 scope = ipv6_addr_scope(pfx);
2085
2086 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2087 if (addrconf_finite_timeout(timeout)) {
2088 expires = jiffies_to_clock_t(timeout * HZ);
2089 valid_lft = timeout;
2090 flags = RTF_EXPIRES;
2091 } else {
2092 expires = 0;
2093 flags = 0;
2094 ifa_flags |= IFA_F_PERMANENT;
2095 }
2096
2097 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2098 if (addrconf_finite_timeout(timeout)) {
2099 if (timeout == 0)
2100 ifa_flags |= IFA_F_DEPRECATED;
2101 prefered_lft = timeout;
2102 }
2103
2104 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2105
2106 if (!IS_ERR(ifp)) {
2107 spin_lock_bh(&ifp->lock);
2108 ifp->valid_lft = valid_lft;
2109 ifp->prefered_lft = prefered_lft;
2110 ifp->tstamp = jiffies;
2111 spin_unlock_bh(&ifp->lock);
2112
2113 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2114 expires, flags);
2115 /*
2116 * Note that section 3.1 of RFC 4429 indicates
2117 * that the Optimistic flag should not be set for
2118 * manually configured addresses
2119 */
2120 addrconf_dad_start(ifp, 0);
2121 in6_ifa_put(ifp);
2122 addrconf_verify(0);
2123 return 0;
2124 }
2125
2126 return PTR_ERR(ifp);
2127 }
2128
2129 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2130 unsigned int plen)
2131 {
2132 struct inet6_ifaddr *ifp;
2133 struct inet6_dev *idev;
2134 struct net_device *dev;
2135
2136 if (plen > 128)
2137 return -EINVAL;
2138
2139 dev = __dev_get_by_index(net, ifindex);
2140 if (!dev)
2141 return -ENODEV;
2142
2143 if ((idev = __in6_dev_get(dev)) == NULL)
2144 return -ENXIO;
2145
2146 read_lock_bh(&idev->lock);
2147 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2148 if (ifp->prefix_len == plen &&
2149 ipv6_addr_equal(pfx, &ifp->addr)) {
2150 in6_ifa_hold(ifp);
2151 read_unlock_bh(&idev->lock);
2152
2153 ipv6_del_addr(ifp);
2154
2155 /* If the last address is deleted administratively,
2156 disable IPv6 on this interface.
2157 */
2158 if (idev->addr_list == NULL)
2159 addrconf_ifdown(idev->dev, 1);
2160 return 0;
2161 }
2162 }
2163 read_unlock_bh(&idev->lock);
2164 return -EADDRNOTAVAIL;
2165 }
2166
2167
2168 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2169 {
2170 struct in6_ifreq ireq;
2171 int err;
2172
2173 if (!capable(CAP_NET_ADMIN))
2174 return -EPERM;
2175
2176 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2177 return -EFAULT;
2178
2179 rtnl_lock();
2180 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2181 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2182 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2183 rtnl_unlock();
2184 return err;
2185 }
2186
2187 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2188 {
2189 struct in6_ifreq ireq;
2190 int err;
2191
2192 if (!capable(CAP_NET_ADMIN))
2193 return -EPERM;
2194
2195 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2196 return -EFAULT;
2197
2198 rtnl_lock();
2199 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2200 ireq.ifr6_prefixlen);
2201 rtnl_unlock();
2202 return err;
2203 }
2204
2205 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2206 int plen, int scope)
2207 {
2208 struct inet6_ifaddr *ifp;
2209
2210 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2211 if (!IS_ERR(ifp)) {
2212 spin_lock_bh(&ifp->lock);
2213 ifp->flags &= ~IFA_F_TENTATIVE;
2214 spin_unlock_bh(&ifp->lock);
2215 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2216 in6_ifa_put(ifp);
2217 }
2218 }
2219
2220 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2221 static void sit_add_v4_addrs(struct inet6_dev *idev)
2222 {
2223 struct in6_addr addr;
2224 struct net_device *dev;
2225 struct net *net = dev_net(idev->dev);
2226 int scope;
2227
2228 ASSERT_RTNL();
2229
2230 memset(&addr, 0, sizeof(struct in6_addr));
2231 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2232
2233 if (idev->dev->flags&IFF_POINTOPOINT) {
2234 addr.s6_addr32[0] = htonl(0xfe800000);
2235 scope = IFA_LINK;
2236 } else {
2237 scope = IPV6_ADDR_COMPATv4;
2238 }
2239
2240 if (addr.s6_addr32[3]) {
2241 add_addr(idev, &addr, 128, scope);
2242 return;
2243 }
2244
2245 for_each_netdev(net, dev) {
2246 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2247 if (in_dev && (dev->flags & IFF_UP)) {
2248 struct in_ifaddr * ifa;
2249
2250 int flag = scope;
2251
2252 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2253 int plen;
2254
2255 addr.s6_addr32[3] = ifa->ifa_local;
2256
2257 if (ifa->ifa_scope == RT_SCOPE_LINK)
2258 continue;
2259 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2260 if (idev->dev->flags&IFF_POINTOPOINT)
2261 continue;
2262 flag |= IFA_HOST;
2263 }
2264 if (idev->dev->flags&IFF_POINTOPOINT)
2265 plen = 64;
2266 else
2267 plen = 96;
2268
2269 add_addr(idev, &addr, plen, flag);
2270 }
2271 }
2272 }
2273 }
2274 #endif
2275
2276 static void init_loopback(struct net_device *dev)
2277 {
2278 struct inet6_dev *idev;
2279
2280 /* ::1 */
2281
2282 ASSERT_RTNL();
2283
2284 if ((idev = ipv6_find_idev(dev)) == NULL) {
2285 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2286 return;
2287 }
2288
2289 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2290 }
2291
2292 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2293 {
2294 struct inet6_ifaddr * ifp;
2295 u32 addr_flags = IFA_F_PERMANENT;
2296
2297 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2298 if (idev->cnf.optimistic_dad &&
2299 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2300 addr_flags |= IFA_F_OPTIMISTIC;
2301 #endif
2302
2303
2304 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2305 if (!IS_ERR(ifp)) {
2306 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2307 addrconf_dad_start(ifp, 0);
2308 in6_ifa_put(ifp);
2309 }
2310 }
2311
2312 static void addrconf_dev_config(struct net_device *dev)
2313 {
2314 struct in6_addr addr;
2315 struct inet6_dev * idev;
2316
2317 ASSERT_RTNL();
2318
2319 if ((dev->type != ARPHRD_ETHER) &&
2320 (dev->type != ARPHRD_FDDI) &&
2321 (dev->type != ARPHRD_IEEE802_TR) &&
2322 (dev->type != ARPHRD_ARCNET) &&
2323 (dev->type != ARPHRD_INFINIBAND)) {
2324 /* Alas, we support only Ethernet autoconfiguration. */
2325 return;
2326 }
2327
2328 idev = addrconf_add_dev(dev);
2329 if (idev == NULL)
2330 return;
2331
2332 memset(&addr, 0, sizeof(struct in6_addr));
2333 addr.s6_addr32[0] = htonl(0xFE800000);
2334
2335 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2336 addrconf_add_linklocal(idev, &addr);
2337 }
2338
2339 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2340 static void addrconf_sit_config(struct net_device *dev)
2341 {
2342 struct inet6_dev *idev;
2343
2344 ASSERT_RTNL();
2345
2346 /*
2347 * Configure the tunnel with one of our IPv4
2348 * addresses... we should configure all of
2349 * our v4 addrs in the tunnel
2350 */
2351
2352 if ((idev = ipv6_find_idev(dev)) == NULL) {
2353 printk(KERN_DEBUG "init sit: add_dev failed\n");
2354 return;
2355 }
2356
2357 if (dev->priv_flags & IFF_ISATAP) {
2358 struct in6_addr addr;
2359
2360 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2361 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2362 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2363 addrconf_add_linklocal(idev, &addr);
2364 return;
2365 }
2366
2367 sit_add_v4_addrs(idev);
2368
2369 if (dev->flags&IFF_POINTOPOINT) {
2370 addrconf_add_mroute(dev);
2371 addrconf_add_lroute(dev);
2372 } else
2373 sit_route_add(dev);
2374 }
2375 #endif
2376
2377 static inline int
2378 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2379 {
2380 struct in6_addr lladdr;
2381
2382 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2383 addrconf_add_linklocal(idev, &lladdr);
2384 return 0;
2385 }
2386 return -1;
2387 }
2388
2389 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2390 {
2391 struct net_device *link_dev;
2392 struct net *net = dev_net(idev->dev);
2393
2394 /* first try to inherit the link-local address from the link device */
2395 if (idev->dev->iflink &&
2396 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2397 if (!ipv6_inherit_linklocal(idev, link_dev))
2398 return;
2399 }
2400 /* then try to inherit it from any device */
2401 for_each_netdev(net, link_dev) {
2402 if (!ipv6_inherit_linklocal(idev, link_dev))
2403 return;
2404 }
2405 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2406 }
2407
2408 /*
2409 * Autoconfigure tunnel with a link-local address so routing protocols,
2410 * DHCPv6, MLD etc. can be run over the virtual link
2411 */
2412
2413 static void addrconf_ip6_tnl_config(struct net_device *dev)
2414 {
2415 struct inet6_dev *idev;
2416
2417 ASSERT_RTNL();
2418
2419 if ((idev = addrconf_add_dev(dev)) == NULL) {
2420 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2421 return;
2422 }
2423 ip6_tnl_add_linklocal(idev);
2424 }
2425
2426 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2427 void * data)
2428 {
2429 struct net_device *dev = (struct net_device *) data;
2430 struct inet6_dev *idev = __in6_dev_get(dev);
2431 int run_pending = 0;
2432 int err;
2433
2434 switch(event) {
2435 case NETDEV_REGISTER:
2436 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2437 idev = ipv6_add_dev(dev);
2438 if (!idev)
2439 return notifier_from_errno(-ENOMEM);
2440 }
2441 break;
2442 case NETDEV_UP:
2443 case NETDEV_CHANGE:
2444 if (dev->flags & IFF_SLAVE)
2445 break;
2446
2447 if (event == NETDEV_UP) {
2448 if (!addrconf_qdisc_ok(dev)) {
2449 /* device is not ready yet. */
2450 printk(KERN_INFO
2451 "ADDRCONF(NETDEV_UP): %s: "
2452 "link is not ready\n",
2453 dev->name);
2454 break;
2455 }
2456
2457 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2458 idev = ipv6_add_dev(dev);
2459
2460 if (idev) {
2461 idev->if_flags |= IF_READY;
2462 run_pending = 1;
2463 }
2464 } else {
2465 if (!addrconf_qdisc_ok(dev)) {
2466 /* device is still not ready. */
2467 break;
2468 }
2469
2470 if (idev) {
2471 if (idev->if_flags & IF_READY) {
2472 /* device is already configured. */
2473 break;
2474 }
2475 idev->if_flags |= IF_READY;
2476 }
2477
2478 printk(KERN_INFO
2479 "ADDRCONF(NETDEV_CHANGE): %s: "
2480 "link becomes ready\n",
2481 dev->name);
2482
2483 run_pending = 1;
2484 }
2485
2486 switch(dev->type) {
2487 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2488 case ARPHRD_SIT:
2489 addrconf_sit_config(dev);
2490 break;
2491 #endif
2492 case ARPHRD_TUNNEL6:
2493 addrconf_ip6_tnl_config(dev);
2494 break;
2495 case ARPHRD_LOOPBACK:
2496 init_loopback(dev);
2497 break;
2498
2499 default:
2500 addrconf_dev_config(dev);
2501 break;
2502 }
2503 if (idev) {
2504 if (run_pending)
2505 addrconf_dad_run(idev);
2506
2507 /* If the MTU changed during the interface down, when the
2508 interface up, the changed MTU must be reflected in the
2509 idev as well as routers.
2510 */
2511 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2512 rt6_mtu_change(dev, dev->mtu);
2513 idev->cnf.mtu6 = dev->mtu;
2514 }
2515 idev->tstamp = jiffies;
2516 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2517 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2518 stop IPv6 on this interface.
2519 */
2520 if (dev->mtu < IPV6_MIN_MTU)
2521 addrconf_ifdown(dev, event != NETDEV_DOWN);
2522 }
2523 break;
2524
2525 case NETDEV_CHANGEMTU:
2526 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2527 rt6_mtu_change(dev, dev->mtu);
2528 idev->cnf.mtu6 = dev->mtu;
2529 break;
2530 }
2531
2532 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2533 idev = ipv6_add_dev(dev);
2534 if (idev)
2535 break;
2536 }
2537
2538 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2539
2540 case NETDEV_DOWN:
2541 case NETDEV_UNREGISTER:
2542 /*
2543 * Remove all addresses from this interface.
2544 */
2545 addrconf_ifdown(dev, event != NETDEV_DOWN);
2546 break;
2547
2548 case NETDEV_CHANGENAME:
2549 if (idev) {
2550 snmp6_unregister_dev(idev);
2551 addrconf_sysctl_unregister(idev);
2552 addrconf_sysctl_register(idev);
2553 err = snmp6_register_dev(idev);
2554 if (err)
2555 return notifier_from_errno(err);
2556 }
2557 break;
2558 }
2559
2560 return NOTIFY_OK;
2561 }
2562
2563 /*
2564 * addrconf module should be notified of a device going up
2565 */
2566 static struct notifier_block ipv6_dev_notf = {
2567 .notifier_call = addrconf_notify,
2568 .priority = 0
2569 };
2570
2571 static int addrconf_ifdown(struct net_device *dev, int how)
2572 {
2573 struct inet6_dev *idev;
2574 struct inet6_ifaddr *ifa, **bifa;
2575 struct net *net = dev_net(dev);
2576 int i;
2577
2578 ASSERT_RTNL();
2579
2580 rt6_ifdown(net, dev);
2581 neigh_ifdown(&nd_tbl, dev);
2582
2583 idev = __in6_dev_get(dev);
2584 if (idev == NULL)
2585 return -ENODEV;
2586
2587 /* Step 1: remove reference to ipv6 device from parent device.
2588 Do not dev_put!
2589 */
2590 if (how) {
2591 idev->dead = 1;
2592
2593 /* protected by rtnl_lock */
2594 rcu_assign_pointer(dev->ip6_ptr, NULL);
2595
2596 /* Step 1.5: remove snmp6 entry */
2597 snmp6_unregister_dev(idev);
2598
2599 }
2600
2601 /* Step 2: clear hash table */
2602 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2603 bifa = &inet6_addr_lst[i];
2604
2605 write_lock_bh(&addrconf_hash_lock);
2606 while ((ifa = *bifa) != NULL) {
2607 if (ifa->idev == idev) {
2608 *bifa = ifa->lst_next;
2609 ifa->lst_next = NULL;
2610 addrconf_del_timer(ifa);
2611 in6_ifa_put(ifa);
2612 continue;
2613 }
2614 bifa = &ifa->lst_next;
2615 }
2616 write_unlock_bh(&addrconf_hash_lock);
2617 }
2618
2619 write_lock_bh(&idev->lock);
2620
2621 /* Step 3: clear flags for stateless addrconf */
2622 if (!how)
2623 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2624
2625 /* Step 4: clear address list */
2626 #ifdef CONFIG_IPV6_PRIVACY
2627 if (how && del_timer(&idev->regen_timer))
2628 in6_dev_put(idev);
2629
2630 /* clear tempaddr list */
2631 while ((ifa = idev->tempaddr_list) != NULL) {
2632 idev->tempaddr_list = ifa->tmp_next;
2633 ifa->tmp_next = NULL;
2634 ifa->dead = 1;
2635 write_unlock_bh(&idev->lock);
2636 spin_lock_bh(&ifa->lock);
2637
2638 if (ifa->ifpub) {
2639 in6_ifa_put(ifa->ifpub);
2640 ifa->ifpub = NULL;
2641 }
2642 spin_unlock_bh(&ifa->lock);
2643 in6_ifa_put(ifa);
2644 write_lock_bh(&idev->lock);
2645 }
2646 #endif
2647 while ((ifa = idev->addr_list) != NULL) {
2648 idev->addr_list = ifa->if_next;
2649 ifa->if_next = NULL;
2650 ifa->dead = 1;
2651 addrconf_del_timer(ifa);
2652 write_unlock_bh(&idev->lock);
2653
2654 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2655 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2656 in6_ifa_put(ifa);
2657
2658 write_lock_bh(&idev->lock);
2659 }
2660 write_unlock_bh(&idev->lock);
2661
2662 /* Step 5: Discard multicast list */
2663
2664 if (how)
2665 ipv6_mc_destroy_dev(idev);
2666 else
2667 ipv6_mc_down(idev);
2668
2669 idev->tstamp = jiffies;
2670
2671 /* Shot the device (if unregistered) */
2672
2673 if (how) {
2674 addrconf_sysctl_unregister(idev);
2675 neigh_parms_release(&nd_tbl, idev->nd_parms);
2676 neigh_ifdown(&nd_tbl, dev);
2677 in6_dev_put(idev);
2678 }
2679 return 0;
2680 }
2681
2682 static void addrconf_rs_timer(unsigned long data)
2683 {
2684 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2685
2686 if (ifp->idev->cnf.forwarding)
2687 goto out;
2688
2689 if (ifp->idev->if_flags & IF_RA_RCVD) {
2690 /*
2691 * Announcement received after solicitation
2692 * was sent
2693 */
2694 goto out;
2695 }
2696
2697 spin_lock(&ifp->lock);
2698 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2699 /* The wait after the last probe can be shorter */
2700 addrconf_mod_timer(ifp, AC_RS,
2701 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2702 ifp->idev->cnf.rtr_solicit_delay :
2703 ifp->idev->cnf.rtr_solicit_interval);
2704 spin_unlock(&ifp->lock);
2705
2706 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2707 } else {
2708 spin_unlock(&ifp->lock);
2709 /*
2710 * Note: we do not support deprecated "all on-link"
2711 * assumption any longer.
2712 */
2713 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2714 ifp->idev->dev->name);
2715 }
2716
2717 out:
2718 in6_ifa_put(ifp);
2719 }
2720
2721 /*
2722 * Duplicate Address Detection
2723 */
2724 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2725 {
2726 unsigned long rand_num;
2727 struct inet6_dev *idev = ifp->idev;
2728
2729 if (ifp->flags & IFA_F_OPTIMISTIC)
2730 rand_num = 0;
2731 else
2732 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2733
2734 ifp->probes = idev->cnf.dad_transmits;
2735 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2736 }
2737
2738 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2739 {
2740 struct inet6_dev *idev = ifp->idev;
2741 struct net_device *dev = idev->dev;
2742
2743 addrconf_join_solict(dev, &ifp->addr);
2744
2745 net_srandom(ifp->addr.s6_addr32[3]);
2746
2747 read_lock_bh(&idev->lock);
2748 if (ifp->dead)
2749 goto out;
2750 spin_lock_bh(&ifp->lock);
2751
2752 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2753 idev->cnf.accept_dad < 1 ||
2754 !(ifp->flags&IFA_F_TENTATIVE) ||
2755 ifp->flags & IFA_F_NODAD) {
2756 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2757 spin_unlock_bh(&ifp->lock);
2758 read_unlock_bh(&idev->lock);
2759
2760 addrconf_dad_completed(ifp);
2761 return;
2762 }
2763
2764 if (!(idev->if_flags & IF_READY)) {
2765 spin_unlock_bh(&ifp->lock);
2766 read_unlock_bh(&idev->lock);
2767 /*
2768 * If the defice is not ready:
2769 * - keep it tentative if it is a permanent address.
2770 * - otherwise, kill it.
2771 */
2772 in6_ifa_hold(ifp);
2773 addrconf_dad_stop(ifp);
2774 return;
2775 }
2776
2777 /*
2778 * Optimistic nodes can start receiving
2779 * Frames right away
2780 */
2781 if(ifp->flags & IFA_F_OPTIMISTIC)
2782 ip6_ins_rt(ifp->rt);
2783
2784 addrconf_dad_kick(ifp);
2785 spin_unlock_bh(&ifp->lock);
2786 out:
2787 read_unlock_bh(&idev->lock);
2788 }
2789
2790 static void addrconf_dad_timer(unsigned long data)
2791 {
2792 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2793 struct inet6_dev *idev = ifp->idev;
2794 struct in6_addr mcaddr;
2795
2796 read_lock_bh(&idev->lock);
2797 if (idev->dead) {
2798 read_unlock_bh(&idev->lock);
2799 goto out;
2800 }
2801 spin_lock_bh(&ifp->lock);
2802 if (ifp->probes == 0) {
2803 /*
2804 * DAD was successful
2805 */
2806
2807 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2808 spin_unlock_bh(&ifp->lock);
2809 read_unlock_bh(&idev->lock);
2810
2811 addrconf_dad_completed(ifp);
2812
2813 goto out;
2814 }
2815
2816 ifp->probes--;
2817 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2818 spin_unlock_bh(&ifp->lock);
2819 read_unlock_bh(&idev->lock);
2820
2821 /* send a neighbour solicitation for our addr */
2822 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2823 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2824 out:
2825 in6_ifa_put(ifp);
2826 }
2827
2828 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2829 {
2830 struct net_device * dev = ifp->idev->dev;
2831
2832 /*
2833 * Configure the address for reception. Now it is valid.
2834 */
2835
2836 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2837
2838 /* If added prefix is link local and forwarding is off,
2839 start sending router solicitations.
2840 */
2841
2842 if (ifp->idev->cnf.forwarding == 0 &&
2843 ifp->idev->cnf.rtr_solicits > 0 &&
2844 (dev->flags&IFF_LOOPBACK) == 0 &&
2845 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2846 /*
2847 * If a host as already performed a random delay
2848 * [...] as part of DAD [...] there is no need
2849 * to delay again before sending the first RS
2850 */
2851 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2852
2853 spin_lock_bh(&ifp->lock);
2854 ifp->probes = 1;
2855 ifp->idev->if_flags |= IF_RS_SENT;
2856 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2857 spin_unlock_bh(&ifp->lock);
2858 }
2859 }
2860
2861 static void addrconf_dad_run(struct inet6_dev *idev) {
2862 struct inet6_ifaddr *ifp;
2863
2864 read_lock_bh(&idev->lock);
2865 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2866 spin_lock_bh(&ifp->lock);
2867 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2868 spin_unlock_bh(&ifp->lock);
2869 continue;
2870 }
2871 spin_unlock_bh(&ifp->lock);
2872 addrconf_dad_kick(ifp);
2873 }
2874 read_unlock_bh(&idev->lock);
2875 }
2876
2877 #ifdef CONFIG_PROC_FS
2878 struct if6_iter_state {
2879 struct seq_net_private p;
2880 int bucket;
2881 };
2882
2883 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2884 {
2885 struct inet6_ifaddr *ifa = NULL;
2886 struct if6_iter_state *state = seq->private;
2887 struct net *net = seq_file_net(seq);
2888
2889 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2890 ifa = inet6_addr_lst[state->bucket];
2891
2892 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2893 ifa = ifa->lst_next;
2894 if (ifa)
2895 break;
2896 }
2897 return ifa;
2898 }
2899
2900 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2901 {
2902 struct if6_iter_state *state = seq->private;
2903 struct net *net = seq_file_net(seq);
2904
2905 ifa = ifa->lst_next;
2906 try_again:
2907 if (ifa) {
2908 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2909 ifa = ifa->lst_next;
2910 goto try_again;
2911 }
2912 }
2913
2914 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2915 ifa = inet6_addr_lst[state->bucket];
2916 goto try_again;
2917 }
2918
2919 return ifa;
2920 }
2921
2922 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2923 {
2924 struct inet6_ifaddr *ifa = if6_get_first(seq);
2925
2926 if (ifa)
2927 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2928 --pos;
2929 return pos ? NULL : ifa;
2930 }
2931
2932 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2933 __acquires(addrconf_hash_lock)
2934 {
2935 read_lock_bh(&addrconf_hash_lock);
2936 return if6_get_idx(seq, *pos);
2937 }
2938
2939 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2940 {
2941 struct inet6_ifaddr *ifa;
2942
2943 ifa = if6_get_next(seq, v);
2944 ++*pos;
2945 return ifa;
2946 }
2947
2948 static void if6_seq_stop(struct seq_file *seq, void *v)
2949 __releases(addrconf_hash_lock)
2950 {
2951 read_unlock_bh(&addrconf_hash_lock);
2952 }
2953
2954 static int if6_seq_show(struct seq_file *seq, void *v)
2955 {
2956 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2957 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
2958 &ifp->addr,
2959 ifp->idev->dev->ifindex,
2960 ifp->prefix_len,
2961 ifp->scope,
2962 ifp->flags,
2963 ifp->idev->dev->name);
2964 return 0;
2965 }
2966
2967 static const struct seq_operations if6_seq_ops = {
2968 .start = if6_seq_start,
2969 .next = if6_seq_next,
2970 .show = if6_seq_show,
2971 .stop = if6_seq_stop,
2972 };
2973
2974 static int if6_seq_open(struct inode *inode, struct file *file)
2975 {
2976 return seq_open_net(inode, file, &if6_seq_ops,
2977 sizeof(struct if6_iter_state));
2978 }
2979
2980 static const struct file_operations if6_fops = {
2981 .owner = THIS_MODULE,
2982 .open = if6_seq_open,
2983 .read = seq_read,
2984 .llseek = seq_lseek,
2985 .release = seq_release_net,
2986 };
2987
2988 static int if6_proc_net_init(struct net *net)
2989 {
2990 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2991 return -ENOMEM;
2992 return 0;
2993 }
2994
2995 static void if6_proc_net_exit(struct net *net)
2996 {
2997 proc_net_remove(net, "if_inet6");
2998 }
2999
3000 static struct pernet_operations if6_proc_net_ops = {
3001 .init = if6_proc_net_init,
3002 .exit = if6_proc_net_exit,
3003 };
3004
3005 int __init if6_proc_init(void)
3006 {
3007 return register_pernet_subsys(&if6_proc_net_ops);
3008 }
3009
3010 void if6_proc_exit(void)
3011 {
3012 unregister_pernet_subsys(&if6_proc_net_ops);
3013 }
3014 #endif /* CONFIG_PROC_FS */
3015
3016 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3017 /* Check if address is a home address configured on any interface. */
3018 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3019 {
3020 int ret = 0;
3021 struct inet6_ifaddr * ifp;
3022 u8 hash = ipv6_addr_hash(addr);
3023 read_lock_bh(&addrconf_hash_lock);
3024 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3025 if (!net_eq(dev_net(ifp->idev->dev), net))
3026 continue;
3027 if (ipv6_addr_equal(&ifp->addr, addr) &&
3028 (ifp->flags & IFA_F_HOMEADDRESS)) {
3029 ret = 1;
3030 break;
3031 }
3032 }
3033 read_unlock_bh(&addrconf_hash_lock);
3034 return ret;
3035 }
3036 #endif
3037
3038 /*
3039 * Periodic address status verification
3040 */
3041
3042 static void addrconf_verify(unsigned long foo)
3043 {
3044 struct inet6_ifaddr *ifp;
3045 unsigned long now, next;
3046 int i;
3047
3048 spin_lock_bh(&addrconf_verify_lock);
3049 now = jiffies;
3050 next = now + ADDR_CHECK_FREQUENCY;
3051
3052 del_timer(&addr_chk_timer);
3053
3054 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3055
3056 restart:
3057 read_lock(&addrconf_hash_lock);
3058 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3059 unsigned long age;
3060 #ifdef CONFIG_IPV6_PRIVACY
3061 unsigned long regen_advance;
3062 #endif
3063
3064 if (ifp->flags & IFA_F_PERMANENT)
3065 continue;
3066
3067 spin_lock(&ifp->lock);
3068 age = (now - ifp->tstamp) / HZ;
3069
3070 #ifdef CONFIG_IPV6_PRIVACY
3071 regen_advance = ifp->idev->cnf.regen_max_retry *
3072 ifp->idev->cnf.dad_transmits *
3073 ifp->idev->nd_parms->retrans_time / HZ;
3074 #endif
3075
3076 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3077 age >= ifp->valid_lft) {
3078 spin_unlock(&ifp->lock);
3079 in6_ifa_hold(ifp);
3080 read_unlock(&addrconf_hash_lock);
3081 ipv6_del_addr(ifp);
3082 goto restart;
3083 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3084 spin_unlock(&ifp->lock);
3085 continue;
3086 } else if (age >= ifp->prefered_lft) {
3087 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3088 int deprecate = 0;
3089
3090 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3091 deprecate = 1;
3092 ifp->flags |= IFA_F_DEPRECATED;
3093 }
3094
3095 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3096 next = ifp->tstamp + ifp->valid_lft * HZ;
3097
3098 spin_unlock(&ifp->lock);
3099
3100 if (deprecate) {
3101 in6_ifa_hold(ifp);
3102 read_unlock(&addrconf_hash_lock);
3103
3104 ipv6_ifa_notify(0, ifp);
3105 in6_ifa_put(ifp);
3106 goto restart;
3107 }
3108 #ifdef CONFIG_IPV6_PRIVACY
3109 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3110 !(ifp->flags&IFA_F_TENTATIVE)) {
3111 if (age >= ifp->prefered_lft - regen_advance) {
3112 struct inet6_ifaddr *ifpub = ifp->ifpub;
3113 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3114 next = ifp->tstamp + ifp->prefered_lft * HZ;
3115 if (!ifp->regen_count && ifpub) {
3116 ifp->regen_count++;
3117 in6_ifa_hold(ifp);
3118 in6_ifa_hold(ifpub);
3119 spin_unlock(&ifp->lock);
3120 read_unlock(&addrconf_hash_lock);
3121 spin_lock(&ifpub->lock);
3122 ifpub->regen_count = 0;
3123 spin_unlock(&ifpub->lock);
3124 ipv6_create_tempaddr(ifpub, ifp);
3125 in6_ifa_put(ifpub);
3126 in6_ifa_put(ifp);
3127 goto restart;
3128 }
3129 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3130 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3131 spin_unlock(&ifp->lock);
3132 #endif
3133 } else {
3134 /* ifp->prefered_lft <= ifp->valid_lft */
3135 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3136 next = ifp->tstamp + ifp->prefered_lft * HZ;
3137 spin_unlock(&ifp->lock);
3138 }
3139 }
3140 read_unlock(&addrconf_hash_lock);
3141 }
3142
3143 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3144 add_timer(&addr_chk_timer);
3145 spin_unlock_bh(&addrconf_verify_lock);
3146 }
3147
3148 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3149 {
3150 struct in6_addr *pfx = NULL;
3151
3152 if (addr)
3153 pfx = nla_data(addr);
3154
3155 if (local) {
3156 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3157 pfx = NULL;
3158 else
3159 pfx = nla_data(local);
3160 }
3161
3162 return pfx;
3163 }
3164
3165 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3166 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3167 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3168 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3169 };
3170
3171 static int
3172 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3173 {
3174 struct net *net = sock_net(skb->sk);
3175 struct ifaddrmsg *ifm;
3176 struct nlattr *tb[IFA_MAX+1];
3177 struct in6_addr *pfx;
3178 int err;
3179
3180 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3181 if (err < 0)
3182 return err;
3183
3184 ifm = nlmsg_data(nlh);
3185 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3186 if (pfx == NULL)
3187 return -EINVAL;
3188
3189 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3190 }
3191
3192 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3193 u32 prefered_lft, u32 valid_lft)
3194 {
3195 u32 flags;
3196 clock_t expires;
3197 unsigned long timeout;
3198
3199 if (!valid_lft || (prefered_lft > valid_lft))
3200 return -EINVAL;
3201
3202 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3203 if (addrconf_finite_timeout(timeout)) {
3204 expires = jiffies_to_clock_t(timeout * HZ);
3205 valid_lft = timeout;
3206 flags = RTF_EXPIRES;
3207 } else {
3208 expires = 0;
3209 flags = 0;
3210 ifa_flags |= IFA_F_PERMANENT;
3211 }
3212
3213 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3214 if (addrconf_finite_timeout(timeout)) {
3215 if (timeout == 0)
3216 ifa_flags |= IFA_F_DEPRECATED;
3217 prefered_lft = timeout;
3218 }
3219
3220 spin_lock_bh(&ifp->lock);
3221 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3222 ifp->tstamp = jiffies;
3223 ifp->valid_lft = valid_lft;
3224 ifp->prefered_lft = prefered_lft;
3225
3226 spin_unlock_bh(&ifp->lock);
3227 if (!(ifp->flags&IFA_F_TENTATIVE))
3228 ipv6_ifa_notify(0, ifp);
3229
3230 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3231 expires, flags);
3232 addrconf_verify(0);
3233
3234 return 0;
3235 }
3236
3237 static int
3238 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3239 {
3240 struct net *net = sock_net(skb->sk);
3241 struct ifaddrmsg *ifm;
3242 struct nlattr *tb[IFA_MAX+1];
3243 struct in6_addr *pfx;
3244 struct inet6_ifaddr *ifa;
3245 struct net_device *dev;
3246 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3247 u8 ifa_flags;
3248 int err;
3249
3250 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3251 if (err < 0)
3252 return err;
3253
3254 ifm = nlmsg_data(nlh);
3255 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3256 if (pfx == NULL)
3257 return -EINVAL;
3258
3259 if (tb[IFA_CACHEINFO]) {
3260 struct ifa_cacheinfo *ci;
3261
3262 ci = nla_data(tb[IFA_CACHEINFO]);
3263 valid_lft = ci->ifa_valid;
3264 preferred_lft = ci->ifa_prefered;
3265 } else {
3266 preferred_lft = INFINITY_LIFE_TIME;
3267 valid_lft = INFINITY_LIFE_TIME;
3268 }
3269
3270 dev = __dev_get_by_index(net, ifm->ifa_index);
3271 if (dev == NULL)
3272 return -ENODEV;
3273
3274 /* We ignore other flags so far. */
3275 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3276
3277 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3278 if (ifa == NULL) {
3279 /*
3280 * It would be best to check for !NLM_F_CREATE here but
3281 * userspace alreay relies on not having to provide this.
3282 */
3283 return inet6_addr_add(net, ifm->ifa_index, pfx,
3284 ifm->ifa_prefixlen, ifa_flags,
3285 preferred_lft, valid_lft);
3286 }
3287
3288 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3289 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3290 err = -EEXIST;
3291 else
3292 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3293
3294 in6_ifa_put(ifa);
3295
3296 return err;
3297 }
3298
3299 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3300 u8 scope, int ifindex)
3301 {
3302 struct ifaddrmsg *ifm;
3303
3304 ifm = nlmsg_data(nlh);
3305 ifm->ifa_family = AF_INET6;
3306 ifm->ifa_prefixlen = prefixlen;
3307 ifm->ifa_flags = flags;
3308 ifm->ifa_scope = scope;
3309 ifm->ifa_index = ifindex;
3310 }
3311
3312 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3313 unsigned long tstamp, u32 preferred, u32 valid)
3314 {
3315 struct ifa_cacheinfo ci;
3316
3317 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3318 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3319 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3320 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3321 ci.ifa_prefered = preferred;
3322 ci.ifa_valid = valid;
3323
3324 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3325 }
3326
3327 static inline int rt_scope(int ifa_scope)
3328 {
3329 if (ifa_scope & IFA_HOST)
3330 return RT_SCOPE_HOST;
3331 else if (ifa_scope & IFA_LINK)
3332 return RT_SCOPE_LINK;
3333 else if (ifa_scope & IFA_SITE)
3334 return RT_SCOPE_SITE;
3335 else
3336 return RT_SCOPE_UNIVERSE;
3337 }
3338
3339 static inline int inet6_ifaddr_msgsize(void)
3340 {
3341 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3342 + nla_total_size(16) /* IFA_ADDRESS */
3343 + nla_total_size(sizeof(struct ifa_cacheinfo));
3344 }
3345
3346 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3347 u32 pid, u32 seq, int event, unsigned int flags)
3348 {
3349 struct nlmsghdr *nlh;
3350 u32 preferred, valid;
3351
3352 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3353 if (nlh == NULL)
3354 return -EMSGSIZE;
3355
3356 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3357 ifa->idev->dev->ifindex);
3358
3359 if (!(ifa->flags&IFA_F_PERMANENT)) {
3360 preferred = ifa->prefered_lft;
3361 valid = ifa->valid_lft;
3362 if (preferred != INFINITY_LIFE_TIME) {
3363 long tval = (jiffies - ifa->tstamp)/HZ;
3364 preferred -= tval;
3365 if (valid != INFINITY_LIFE_TIME)
3366 valid -= tval;
3367 }
3368 } else {
3369 preferred = INFINITY_LIFE_TIME;
3370 valid = INFINITY_LIFE_TIME;
3371 }
3372
3373 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3374 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3375 nlmsg_cancel(skb, nlh);
3376 return -EMSGSIZE;
3377 }
3378
3379 return nlmsg_end(skb, nlh);
3380 }
3381
3382 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3383 u32 pid, u32 seq, int event, u16 flags)
3384 {
3385 struct nlmsghdr *nlh;
3386 u8 scope = RT_SCOPE_UNIVERSE;
3387 int ifindex = ifmca->idev->dev->ifindex;
3388
3389 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3390 scope = RT_SCOPE_SITE;
3391
3392 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3393 if (nlh == NULL)
3394 return -EMSGSIZE;
3395
3396 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3397 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3398 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3399 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3400 nlmsg_cancel(skb, nlh);
3401 return -EMSGSIZE;
3402 }
3403
3404 return nlmsg_end(skb, nlh);
3405 }
3406
3407 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3408 u32 pid, u32 seq, int event, unsigned int flags)
3409 {
3410 struct nlmsghdr *nlh;
3411 u8 scope = RT_SCOPE_UNIVERSE;
3412 int ifindex = ifaca->aca_idev->dev->ifindex;
3413
3414 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3415 scope = RT_SCOPE_SITE;
3416
3417 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3418 if (nlh == NULL)
3419 return -EMSGSIZE;
3420
3421 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3422 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3423 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3424 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3425 nlmsg_cancel(skb, nlh);
3426 return -EMSGSIZE;
3427 }
3428
3429 return nlmsg_end(skb, nlh);
3430 }
3431
3432 enum addr_type_t
3433 {
3434 UNICAST_ADDR,
3435 MULTICAST_ADDR,
3436 ANYCAST_ADDR,
3437 };
3438
3439 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3440 enum addr_type_t type)
3441 {
3442 int idx, ip_idx;
3443 int s_idx, s_ip_idx;
3444 int err = 1;
3445 struct net_device *dev;
3446 struct inet6_dev *idev = NULL;
3447 struct inet6_ifaddr *ifa;
3448 struct ifmcaddr6 *ifmca;
3449 struct ifacaddr6 *ifaca;
3450 struct net *net = sock_net(skb->sk);
3451
3452 s_idx = cb->args[0];
3453 s_ip_idx = ip_idx = cb->args[1];
3454
3455 idx = 0;
3456 for_each_netdev(net, dev) {
3457 if (idx < s_idx)
3458 goto cont;
3459 if (idx > s_idx)
3460 s_ip_idx = 0;
3461 ip_idx = 0;
3462 if ((idev = in6_dev_get(dev)) == NULL)
3463 goto cont;
3464 read_lock_bh(&idev->lock);
3465 switch (type) {
3466 case UNICAST_ADDR:
3467 /* unicast address incl. temp addr */
3468 for (ifa = idev->addr_list; ifa;
3469 ifa = ifa->if_next, ip_idx++) {
3470 if (ip_idx < s_ip_idx)
3471 continue;
3472 err = inet6_fill_ifaddr(skb, ifa,
3473 NETLINK_CB(cb->skb).pid,
3474 cb->nlh->nlmsg_seq,
3475 RTM_NEWADDR,
3476 NLM_F_MULTI);
3477 }
3478 break;
3479 case MULTICAST_ADDR:
3480 /* multicast address */
3481 for (ifmca = idev->mc_list; ifmca;
3482 ifmca = ifmca->next, ip_idx++) {
3483 if (ip_idx < s_ip_idx)
3484 continue;
3485 err = inet6_fill_ifmcaddr(skb, ifmca,
3486 NETLINK_CB(cb->skb).pid,
3487 cb->nlh->nlmsg_seq,
3488 RTM_GETMULTICAST,
3489 NLM_F_MULTI);
3490 }
3491 break;
3492 case ANYCAST_ADDR:
3493 /* anycast address */
3494 for (ifaca = idev->ac_list; ifaca;
3495 ifaca = ifaca->aca_next, ip_idx++) {
3496 if (ip_idx < s_ip_idx)
3497 continue;
3498 err = inet6_fill_ifacaddr(skb, ifaca,
3499 NETLINK_CB(cb->skb).pid,
3500 cb->nlh->nlmsg_seq,
3501 RTM_GETANYCAST,
3502 NLM_F_MULTI);
3503 }
3504 break;
3505 default:
3506 break;
3507 }
3508 read_unlock_bh(&idev->lock);
3509 in6_dev_put(idev);
3510
3511 if (err <= 0)
3512 break;
3513 cont:
3514 idx++;
3515 }
3516 cb->args[0] = idx;
3517 cb->args[1] = ip_idx;
3518 return skb->len;
3519 }
3520
3521 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3522 {
3523 enum addr_type_t type = UNICAST_ADDR;
3524
3525 return inet6_dump_addr(skb, cb, type);
3526 }
3527
3528 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3529 {
3530 enum addr_type_t type = MULTICAST_ADDR;
3531
3532 return inet6_dump_addr(skb, cb, type);
3533 }
3534
3535
3536 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3537 {
3538 enum addr_type_t type = ANYCAST_ADDR;
3539
3540 return inet6_dump_addr(skb, cb, type);
3541 }
3542
3543 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3544 void *arg)
3545 {
3546 struct net *net = sock_net(in_skb->sk);
3547 struct ifaddrmsg *ifm;
3548 struct nlattr *tb[IFA_MAX+1];
3549 struct in6_addr *addr = NULL;
3550 struct net_device *dev = NULL;
3551 struct inet6_ifaddr *ifa;
3552 struct sk_buff *skb;
3553 int err;
3554
3555 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3556 if (err < 0)
3557 goto errout;
3558
3559 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3560 if (addr == NULL) {
3561 err = -EINVAL;
3562 goto errout;
3563 }
3564
3565 ifm = nlmsg_data(nlh);
3566 if (ifm->ifa_index)
3567 dev = __dev_get_by_index(net, ifm->ifa_index);
3568
3569 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3570 err = -EADDRNOTAVAIL;
3571 goto errout;
3572 }
3573
3574 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3575 err = -ENOBUFS;
3576 goto errout_ifa;
3577 }
3578
3579 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3580 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3581 if (err < 0) {
3582 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3583 WARN_ON(err == -EMSGSIZE);
3584 kfree_skb(skb);
3585 goto errout_ifa;
3586 }
3587 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3588 errout_ifa:
3589 in6_ifa_put(ifa);
3590 errout:
3591 return err;
3592 }
3593
3594 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3595 {
3596 struct sk_buff *skb;
3597 struct net *net = dev_net(ifa->idev->dev);
3598 int err = -ENOBUFS;
3599
3600 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3601 if (skb == NULL)
3602 goto errout;
3603
3604 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3605 if (err < 0) {
3606 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3607 WARN_ON(err == -EMSGSIZE);
3608 kfree_skb(skb);
3609 goto errout;
3610 }
3611 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3612 return;
3613 errout:
3614 if (err < 0)
3615 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3616 }
3617
3618 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3619 __s32 *array, int bytes)
3620 {
3621 BUG_ON(bytes < (DEVCONF_MAX * 4));
3622
3623 memset(array, 0, bytes);
3624 array[DEVCONF_FORWARDING] = cnf->forwarding;
3625 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3626 array[DEVCONF_MTU6] = cnf->mtu6;
3627 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3628 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3629 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3630 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3631 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3632 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3633 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3634 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3635 #ifdef CONFIG_IPV6_PRIVACY
3636 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3637 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3638 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3639 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3640 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3641 #endif
3642 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3643 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3644 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3645 #ifdef CONFIG_IPV6_ROUTER_PREF
3646 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3647 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3648 #ifdef CONFIG_IPV6_ROUTE_INFO
3649 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3650 #endif
3651 #endif
3652 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3653 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3654 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3655 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3656 #endif
3657 #ifdef CONFIG_IPV6_MROUTE
3658 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3659 #endif
3660 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3661 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3662 }
3663
3664 static inline size_t inet6_if_nlmsg_size(void)
3665 {
3666 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3667 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3668 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3669 + nla_total_size(4) /* IFLA_MTU */
3670 + nla_total_size(4) /* IFLA_LINK */
3671 + nla_total_size( /* IFLA_PROTINFO */
3672 nla_total_size(4) /* IFLA_INET6_FLAGS */
3673 + nla_total_size(sizeof(struct ifla_cacheinfo))
3674 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3675 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3676 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3677 );
3678 }
3679
3680 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3681 int bytes)
3682 {
3683 int i;
3684 int pad = bytes - sizeof(u64) * items;
3685 BUG_ON(pad < 0);
3686
3687 /* Use put_unaligned() because stats may not be aligned for u64. */
3688 put_unaligned(items, &stats[0]);
3689 for (i = 1; i < items; i++)
3690 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3691
3692 memset(&stats[items], 0, pad);
3693 }
3694
3695 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3696 int bytes)
3697 {
3698 switch(attrtype) {
3699 case IFLA_INET6_STATS:
3700 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3701 break;
3702 case IFLA_INET6_ICMP6STATS:
3703 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3704 break;
3705 }
3706 }
3707
3708 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3709 u32 pid, u32 seq, int event, unsigned int flags)
3710 {
3711 struct net_device *dev = idev->dev;
3712 struct nlattr *nla;
3713 struct ifinfomsg *hdr;
3714 struct nlmsghdr *nlh;
3715 void *protoinfo;
3716 struct ifla_cacheinfo ci;
3717
3718 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3719 if (nlh == NULL)
3720 return -EMSGSIZE;
3721
3722 hdr = nlmsg_data(nlh);
3723 hdr->ifi_family = AF_INET6;
3724 hdr->__ifi_pad = 0;
3725 hdr->ifi_type = dev->type;
3726 hdr->ifi_index = dev->ifindex;
3727 hdr->ifi_flags = dev_get_flags(dev);
3728 hdr->ifi_change = 0;
3729
3730 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3731
3732 if (dev->addr_len)
3733 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3734
3735 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3736 if (dev->ifindex != dev->iflink)
3737 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3738
3739 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3740 if (protoinfo == NULL)
3741 goto nla_put_failure;
3742
3743 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3744
3745 ci.max_reasm_len = IPV6_MAXPLEN;
3746 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3747 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3748 ci.reachable_time = idev->nd_parms->reachable_time;
3749 ci.retrans_time = idev->nd_parms->retrans_time;
3750 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3751
3752 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3753 if (nla == NULL)
3754 goto nla_put_failure;
3755 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3756
3757 /* XXX - MC not implemented */
3758
3759 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3760 if (nla == NULL)
3761 goto nla_put_failure;
3762 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3763
3764 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3765 if (nla == NULL)
3766 goto nla_put_failure;
3767 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3768
3769 nla_nest_end(skb, protoinfo);
3770 return nlmsg_end(skb, nlh);
3771
3772 nla_put_failure:
3773 nlmsg_cancel(skb, nlh);
3774 return -EMSGSIZE;
3775 }
3776
3777 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3778 {
3779 struct net *net = sock_net(skb->sk);
3780 int idx, err;
3781 int s_idx = cb->args[0];
3782 struct net_device *dev;
3783 struct inet6_dev *idev;
3784
3785 read_lock(&dev_base_lock);
3786 idx = 0;
3787 for_each_netdev(net, dev) {
3788 if (idx < s_idx)
3789 goto cont;
3790 if ((idev = in6_dev_get(dev)) == NULL)
3791 goto cont;
3792 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3793 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3794 in6_dev_put(idev);
3795 if (err <= 0)
3796 break;
3797 cont:
3798 idx++;
3799 }
3800 read_unlock(&dev_base_lock);
3801 cb->args[0] = idx;
3802
3803 return skb->len;
3804 }
3805
3806 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3807 {
3808 struct sk_buff *skb;
3809 struct net *net = dev_net(idev->dev);
3810 int err = -ENOBUFS;
3811
3812 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3813 if (skb == NULL)
3814 goto errout;
3815
3816 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3817 if (err < 0) {
3818 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3819 WARN_ON(err == -EMSGSIZE);
3820 kfree_skb(skb);
3821 goto errout;
3822 }
3823 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3824 return;
3825 errout:
3826 if (err < 0)
3827 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3828 }
3829
3830 static inline size_t inet6_prefix_nlmsg_size(void)
3831 {
3832 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3833 + nla_total_size(sizeof(struct in6_addr))
3834 + nla_total_size(sizeof(struct prefix_cacheinfo));
3835 }
3836
3837 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3838 struct prefix_info *pinfo, u32 pid, u32 seq,
3839 int event, unsigned int flags)
3840 {
3841 struct prefixmsg *pmsg;
3842 struct nlmsghdr *nlh;
3843 struct prefix_cacheinfo ci;
3844
3845 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3846 if (nlh == NULL)
3847 return -EMSGSIZE;
3848
3849 pmsg = nlmsg_data(nlh);
3850 pmsg->prefix_family = AF_INET6;
3851 pmsg->prefix_pad1 = 0;
3852 pmsg->prefix_pad2 = 0;
3853 pmsg->prefix_ifindex = idev->dev->ifindex;
3854 pmsg->prefix_len = pinfo->prefix_len;
3855 pmsg->prefix_type = pinfo->type;
3856 pmsg->prefix_pad3 = 0;
3857 pmsg->prefix_flags = 0;
3858 if (pinfo->onlink)
3859 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3860 if (pinfo->autoconf)
3861 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3862
3863 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3864
3865 ci.preferred_time = ntohl(pinfo->prefered);
3866 ci.valid_time = ntohl(pinfo->valid);
3867 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3868
3869 return nlmsg_end(skb, nlh);
3870
3871 nla_put_failure:
3872 nlmsg_cancel(skb, nlh);
3873 return -EMSGSIZE;
3874 }
3875
3876 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3877 struct prefix_info *pinfo)
3878 {
3879 struct sk_buff *skb;
3880 struct net *net = dev_net(idev->dev);
3881 int err = -ENOBUFS;
3882
3883 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3884 if (skb == NULL)
3885 goto errout;
3886
3887 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3888 if (err < 0) {
3889 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3890 WARN_ON(err == -EMSGSIZE);
3891 kfree_skb(skb);
3892 goto errout;
3893 }
3894 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3895 return;
3896 errout:
3897 if (err < 0)
3898 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3899 }
3900
3901 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3902 {
3903 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3904
3905 switch (event) {
3906 case RTM_NEWADDR:
3907 /*
3908 * If the address was optimistic
3909 * we inserted the route at the start of
3910 * our DAD process, so we don't need
3911 * to do it again
3912 */
3913 if (!(ifp->rt->rt6i_node))
3914 ip6_ins_rt(ifp->rt);
3915 if (ifp->idev->cnf.forwarding)
3916 addrconf_join_anycast(ifp);
3917 break;
3918 case RTM_DELADDR:
3919 if (ifp->idev->cnf.forwarding)
3920 addrconf_leave_anycast(ifp);
3921 addrconf_leave_solict(ifp->idev, &ifp->addr);
3922 dst_hold(&ifp->rt->u.dst);
3923 if (ip6_del_rt(ifp->rt))
3924 dst_free(&ifp->rt->u.dst);
3925 break;
3926 }
3927 }
3928
3929 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3930 {
3931 rcu_read_lock_bh();
3932 if (likely(ifp->idev->dead == 0))
3933 __ipv6_ifa_notify(event, ifp);
3934 rcu_read_unlock_bh();
3935 }
3936
3937 #ifdef CONFIG_SYSCTL
3938
3939 static
3940 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3941 void __user *buffer, size_t *lenp, loff_t *ppos)
3942 {
3943 int *valp = ctl->data;
3944 int val = *valp;
3945 int ret;
3946
3947 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3948
3949 if (write)
3950 ret = addrconf_fixup_forwarding(ctl, valp, val);
3951 return ret;
3952 }
3953
3954 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3955 void __user *oldval,
3956 size_t __user *oldlenp,
3957 void __user *newval, size_t newlen)
3958 {
3959 int *valp = table->data;
3960 int val = *valp;
3961 int new;
3962
3963 if (!newval || !newlen)
3964 return 0;
3965 if (newlen != sizeof(int))
3966 return -EINVAL;
3967 if (get_user(new, (int __user *)newval))
3968 return -EFAULT;
3969 if (new == *valp)
3970 return 0;
3971 if (oldval && oldlenp) {
3972 size_t len;
3973 if (get_user(len, oldlenp))
3974 return -EFAULT;
3975 if (len) {
3976 if (len > table->maxlen)
3977 len = table->maxlen;
3978 if (copy_to_user(oldval, valp, len))
3979 return -EFAULT;
3980 if (put_user(len, oldlenp))
3981 return -EFAULT;
3982 }
3983 }
3984
3985 *valp = new;
3986 return addrconf_fixup_forwarding(table, valp, val);
3987 }
3988
3989 static struct addrconf_sysctl_table
3990 {
3991 struct ctl_table_header *sysctl_header;
3992 ctl_table addrconf_vars[DEVCONF_MAX+1];
3993 char *dev_name;
3994 } addrconf_sysctl __read_mostly = {
3995 .sysctl_header = NULL,
3996 .addrconf_vars = {
3997 {
3998 .ctl_name = NET_IPV6_FORWARDING,
3999 .procname = "forwarding",
4000 .data = &ipv6_devconf.forwarding,
4001 .maxlen = sizeof(int),
4002 .mode = 0644,
4003 .proc_handler = addrconf_sysctl_forward,
4004 .strategy = addrconf_sysctl_forward_strategy,
4005 },
4006 {
4007 .ctl_name = NET_IPV6_HOP_LIMIT,
4008 .procname = "hop_limit",
4009 .data = &ipv6_devconf.hop_limit,
4010 .maxlen = sizeof(int),
4011 .mode = 0644,
4012 .proc_handler = proc_dointvec,
4013 },
4014 {
4015 .ctl_name = NET_IPV6_MTU,
4016 .procname = "mtu",
4017 .data = &ipv6_devconf.mtu6,
4018 .maxlen = sizeof(int),
4019 .mode = 0644,
4020 .proc_handler = proc_dointvec,
4021 },
4022 {
4023 .ctl_name = NET_IPV6_ACCEPT_RA,
4024 .procname = "accept_ra",
4025 .data = &ipv6_devconf.accept_ra,
4026 .maxlen = sizeof(int),
4027 .mode = 0644,
4028 .proc_handler = proc_dointvec,
4029 },
4030 {
4031 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
4032 .procname = "accept_redirects",
4033 .data = &ipv6_devconf.accept_redirects,
4034 .maxlen = sizeof(int),
4035 .mode = 0644,
4036 .proc_handler = proc_dointvec,
4037 },
4038 {
4039 .ctl_name = NET_IPV6_AUTOCONF,
4040 .procname = "autoconf",
4041 .data = &ipv6_devconf.autoconf,
4042 .maxlen = sizeof(int),
4043 .mode = 0644,
4044 .proc_handler = proc_dointvec,
4045 },
4046 {
4047 .ctl_name = NET_IPV6_DAD_TRANSMITS,
4048 .procname = "dad_transmits",
4049 .data = &ipv6_devconf.dad_transmits,
4050 .maxlen = sizeof(int),
4051 .mode = 0644,
4052 .proc_handler = proc_dointvec,
4053 },
4054 {
4055 .ctl_name = NET_IPV6_RTR_SOLICITS,
4056 .procname = "router_solicitations",
4057 .data = &ipv6_devconf.rtr_solicits,
4058 .maxlen = sizeof(int),
4059 .mode = 0644,
4060 .proc_handler = proc_dointvec,
4061 },
4062 {
4063 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
4064 .procname = "router_solicitation_interval",
4065 .data = &ipv6_devconf.rtr_solicit_interval,
4066 .maxlen = sizeof(int),
4067 .mode = 0644,
4068 .proc_handler = proc_dointvec_jiffies,
4069 .strategy = sysctl_jiffies,
4070 },
4071 {
4072 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
4073 .procname = "router_solicitation_delay",
4074 .data = &ipv6_devconf.rtr_solicit_delay,
4075 .maxlen = sizeof(int),
4076 .mode = 0644,
4077 .proc_handler = proc_dointvec_jiffies,
4078 .strategy = sysctl_jiffies,
4079 },
4080 {
4081 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
4082 .procname = "force_mld_version",
4083 .data = &ipv6_devconf.force_mld_version,
4084 .maxlen = sizeof(int),
4085 .mode = 0644,
4086 .proc_handler = proc_dointvec,
4087 },
4088 #ifdef CONFIG_IPV6_PRIVACY
4089 {
4090 .ctl_name = NET_IPV6_USE_TEMPADDR,
4091 .procname = "use_tempaddr",
4092 .data = &ipv6_devconf.use_tempaddr,
4093 .maxlen = sizeof(int),
4094 .mode = 0644,
4095 .proc_handler = proc_dointvec,
4096 },
4097 {
4098 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
4099 .procname = "temp_valid_lft",
4100 .data = &ipv6_devconf.temp_valid_lft,
4101 .maxlen = sizeof(int),
4102 .mode = 0644,
4103 .proc_handler = proc_dointvec,
4104 },
4105 {
4106 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4107 .procname = "temp_prefered_lft",
4108 .data = &ipv6_devconf.temp_prefered_lft,
4109 .maxlen = sizeof(int),
4110 .mode = 0644,
4111 .proc_handler = proc_dointvec,
4112 },
4113 {
4114 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4115 .procname = "regen_max_retry",
4116 .data = &ipv6_devconf.regen_max_retry,
4117 .maxlen = sizeof(int),
4118 .mode = 0644,
4119 .proc_handler = proc_dointvec,
4120 },
4121 {
4122 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4123 .procname = "max_desync_factor",
4124 .data = &ipv6_devconf.max_desync_factor,
4125 .maxlen = sizeof(int),
4126 .mode = 0644,
4127 .proc_handler = proc_dointvec,
4128 },
4129 #endif
4130 {
4131 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4132 .procname = "max_addresses",
4133 .data = &ipv6_devconf.max_addresses,
4134 .maxlen = sizeof(int),
4135 .mode = 0644,
4136 .proc_handler = proc_dointvec,
4137 },
4138 {
4139 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4140 .procname = "accept_ra_defrtr",
4141 .data = &ipv6_devconf.accept_ra_defrtr,
4142 .maxlen = sizeof(int),
4143 .mode = 0644,
4144 .proc_handler = proc_dointvec,
4145 },
4146 {
4147 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4148 .procname = "accept_ra_pinfo",
4149 .data = &ipv6_devconf.accept_ra_pinfo,
4150 .maxlen = sizeof(int),
4151 .mode = 0644,
4152 .proc_handler = proc_dointvec,
4153 },
4154 #ifdef CONFIG_IPV6_ROUTER_PREF
4155 {
4156 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4157 .procname = "accept_ra_rtr_pref",
4158 .data = &ipv6_devconf.accept_ra_rtr_pref,
4159 .maxlen = sizeof(int),
4160 .mode = 0644,
4161 .proc_handler = proc_dointvec,
4162 },
4163 {
4164 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4165 .procname = "router_probe_interval",
4166 .data = &ipv6_devconf.rtr_probe_interval,
4167 .maxlen = sizeof(int),
4168 .mode = 0644,
4169 .proc_handler = proc_dointvec_jiffies,
4170 .strategy = sysctl_jiffies,
4171 },
4172 #ifdef CONFIG_IPV6_ROUTE_INFO
4173 {
4174 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4175 .procname = "accept_ra_rt_info_max_plen",
4176 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4177 .maxlen = sizeof(int),
4178 .mode = 0644,
4179 .proc_handler = proc_dointvec,
4180 },
4181 #endif
4182 #endif
4183 {
4184 .ctl_name = NET_IPV6_PROXY_NDP,
4185 .procname = "proxy_ndp",
4186 .data = &ipv6_devconf.proxy_ndp,
4187 .maxlen = sizeof(int),
4188 .mode = 0644,
4189 .proc_handler = proc_dointvec,
4190 },
4191 {
4192 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4193 .procname = "accept_source_route",
4194 .data = &ipv6_devconf.accept_source_route,
4195 .maxlen = sizeof(int),
4196 .mode = 0644,
4197 .proc_handler = proc_dointvec,
4198 },
4199 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4200 {
4201 .ctl_name = CTL_UNNUMBERED,
4202 .procname = "optimistic_dad",
4203 .data = &ipv6_devconf.optimistic_dad,
4204 .maxlen = sizeof(int),
4205 .mode = 0644,
4206 .proc_handler = proc_dointvec,
4207
4208 },
4209 #endif
4210 #ifdef CONFIG_IPV6_MROUTE
4211 {
4212 .ctl_name = CTL_UNNUMBERED,
4213 .procname = "mc_forwarding",
4214 .data = &ipv6_devconf.mc_forwarding,
4215 .maxlen = sizeof(int),
4216 .mode = 0444,
4217 .proc_handler = proc_dointvec,
4218 },
4219 #endif
4220 {
4221 .ctl_name = CTL_UNNUMBERED,
4222 .procname = "disable_ipv6",
4223 .data = &ipv6_devconf.disable_ipv6,
4224 .maxlen = sizeof(int),
4225 .mode = 0644,
4226 .proc_handler = proc_dointvec,
4227 },
4228 {
4229 .ctl_name = CTL_UNNUMBERED,
4230 .procname = "accept_dad",
4231 .data = &ipv6_devconf.accept_dad,
4232 .maxlen = sizeof(int),
4233 .mode = 0644,
4234 .proc_handler = proc_dointvec,
4235 },
4236 {
4237 .ctl_name = 0, /* sentinel */
4238 }
4239 },
4240 };
4241
4242 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4243 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4244 {
4245 int i;
4246 struct addrconf_sysctl_table *t;
4247
4248 #define ADDRCONF_CTL_PATH_DEV 3
4249
4250 struct ctl_path addrconf_ctl_path[] = {
4251 { .procname = "net", .ctl_name = CTL_NET, },
4252 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4253 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4254 { /* to be set */ },
4255 { },
4256 };
4257
4258
4259 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4260 if (t == NULL)
4261 goto out;
4262
4263 for (i=0; t->addrconf_vars[i].data; i++) {
4264 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4265 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4266 t->addrconf_vars[i].extra2 = net;
4267 }
4268
4269 /*
4270 * Make a copy of dev_name, because '.procname' is regarded as const
4271 * by sysctl and we wouldn't want anyone to change it under our feet
4272 * (see SIOCSIFNAME).
4273 */
4274 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4275 if (!t->dev_name)
4276 goto free;
4277
4278 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4279 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4280
4281 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4282 t->addrconf_vars);
4283 if (t->sysctl_header == NULL)
4284 goto free_procname;
4285
4286 p->sysctl = t;
4287 return 0;
4288
4289 free_procname:
4290 kfree(t->dev_name);
4291 free:
4292 kfree(t);
4293 out:
4294 return -ENOBUFS;
4295 }
4296
4297 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4298 {
4299 struct addrconf_sysctl_table *t;
4300
4301 if (p->sysctl == NULL)
4302 return;
4303
4304 t = p->sysctl;
4305 p->sysctl = NULL;
4306 unregister_sysctl_table(t->sysctl_header);
4307 kfree(t->dev_name);
4308 kfree(t);
4309 }
4310
4311 static void addrconf_sysctl_register(struct inet6_dev *idev)
4312 {
4313 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4314 NET_IPV6_NEIGH, "ipv6",
4315 &ndisc_ifinfo_sysctl_change,
4316 ndisc_ifinfo_sysctl_strategy);
4317 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4318 idev->dev->ifindex, idev, &idev->cnf);
4319 }
4320
4321 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4322 {
4323 __addrconf_sysctl_unregister(&idev->cnf);
4324 neigh_sysctl_unregister(idev->nd_parms);
4325 }
4326
4327
4328 #endif
4329
4330 static int addrconf_init_net(struct net *net)
4331 {
4332 int err;
4333 struct ipv6_devconf *all, *dflt;
4334
4335 err = -ENOMEM;
4336 all = &ipv6_devconf;
4337 dflt = &ipv6_devconf_dflt;
4338
4339 if (net != &init_net) {
4340 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4341 if (all == NULL)
4342 goto err_alloc_all;
4343
4344 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4345 if (dflt == NULL)
4346 goto err_alloc_dflt;
4347 }
4348
4349 net->ipv6.devconf_all = all;
4350 net->ipv6.devconf_dflt = dflt;
4351
4352 #ifdef CONFIG_SYSCTL
4353 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4354 NULL, all);
4355 if (err < 0)
4356 goto err_reg_all;
4357
4358 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4359 NULL, dflt);
4360 if (err < 0)
4361 goto err_reg_dflt;
4362 #endif
4363 return 0;
4364
4365 #ifdef CONFIG_SYSCTL
4366 err_reg_dflt:
4367 __addrconf_sysctl_unregister(all);
4368 err_reg_all:
4369 kfree(dflt);
4370 #endif
4371 err_alloc_dflt:
4372 kfree(all);
4373 err_alloc_all:
4374 return err;
4375 }
4376
4377 static void addrconf_exit_net(struct net *net)
4378 {
4379 #ifdef CONFIG_SYSCTL
4380 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4381 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4382 #endif
4383 if (net != &init_net) {
4384 kfree(net->ipv6.devconf_dflt);
4385 kfree(net->ipv6.devconf_all);
4386 }
4387 }
4388
4389 static struct pernet_operations addrconf_ops = {
4390 .init = addrconf_init_net,
4391 .exit = addrconf_exit_net,
4392 };
4393
4394 /*
4395 * Device notifier
4396 */
4397
4398 int register_inet6addr_notifier(struct notifier_block *nb)
4399 {
4400 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4401 }
4402
4403 EXPORT_SYMBOL(register_inet6addr_notifier);
4404
4405 int unregister_inet6addr_notifier(struct notifier_block *nb)
4406 {
4407 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4408 }
4409
4410 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4411
4412 /*
4413 * Init / cleanup code
4414 */
4415
4416 int __init addrconf_init(void)
4417 {
4418 int err;
4419
4420 if ((err = ipv6_addr_label_init()) < 0) {
4421 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4422 err);
4423 return err;
4424 }
4425
4426 register_pernet_subsys(&addrconf_ops);
4427
4428 /* The addrconf netdev notifier requires that loopback_dev
4429 * has it's ipv6 private information allocated and setup
4430 * before it can bring up and give link-local addresses
4431 * to other devices which are up.
4432 *
4433 * Unfortunately, loopback_dev is not necessarily the first
4434 * entry in the global dev_base list of net devices. In fact,
4435 * it is likely to be the very last entry on that list.
4436 * So this causes the notifier registry below to try and
4437 * give link-local addresses to all devices besides loopback_dev
4438 * first, then loopback_dev, which cases all the non-loopback_dev
4439 * devices to fail to get a link-local address.
4440 *
4441 * So, as a temporary fix, allocate the ipv6 structure for
4442 * loopback_dev first by hand.
4443 * Longer term, all of the dependencies ipv6 has upon the loopback
4444 * device and it being up should be removed.
4445 */
4446 rtnl_lock();
4447 if (!ipv6_add_dev(init_net.loopback_dev))
4448 err = -ENOMEM;
4449 rtnl_unlock();
4450 if (err)
4451 goto errlo;
4452
4453 register_netdevice_notifier(&ipv6_dev_notf);
4454
4455 addrconf_verify(0);
4456
4457 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4458 if (err < 0)
4459 goto errout;
4460
4461 /* Only the first call to __rtnl_register can fail */
4462 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4463 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4464 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4465 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4466 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4467
4468 ipv6_addr_label_rtnl_register();
4469
4470 return 0;
4471 errout:
4472 unregister_netdevice_notifier(&ipv6_dev_notf);
4473 errlo:
4474 unregister_pernet_subsys(&addrconf_ops);
4475
4476 return err;
4477 }
4478
4479 void addrconf_cleanup(void)
4480 {
4481 struct inet6_ifaddr *ifa;
4482 struct net_device *dev;
4483 int i;
4484
4485 unregister_netdevice_notifier(&ipv6_dev_notf);
4486 unregister_pernet_subsys(&addrconf_ops);
4487
4488 rtnl_lock();
4489
4490 /* clean dev list */
4491 for_each_netdev(&init_net, dev) {
4492 if (__in6_dev_get(dev) == NULL)
4493 continue;
4494 addrconf_ifdown(dev, 1);
4495 }
4496 addrconf_ifdown(init_net.loopback_dev, 2);
4497
4498 /*
4499 * Check hash table.
4500 */
4501 write_lock_bh(&addrconf_hash_lock);
4502 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4503 for (ifa=inet6_addr_lst[i]; ifa; ) {
4504 struct inet6_ifaddr *bifa;
4505
4506 bifa = ifa;
4507 ifa = ifa->lst_next;
4508 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4509 /* Do not free it; something is wrong.
4510 Now we can investigate it with debugger.
4511 */
4512 }
4513 }
4514 write_unlock_bh(&addrconf_hash_lock);
4515
4516 del_timer(&addr_chk_timer);
4517 rtnl_unlock();
4518 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree