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MIPS: SB1250: Include correct header and fix a warning
[linux-2.6/linux-mips.git] / net / ipv6 / addrconf.c
blob413054f02aab3dbfe5773f9a81b1589cd21d5027
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 #include <linux/slab.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64
65 #include <net/net_namespace.h>
66 #include <net/sock.h>
67 #include <net/snmp.h>
68
69 #include <net/ipv6.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
74 #include <net/tcp.h>
75 #include <net/ip.h>
76 #include <net/netlink.h>
77 #include <net/pkt_sched.h>
78 #include <linux/if_tunnel.h>
79 #include <linux/rtnetlink.h>
80
81 #ifdef CONFIG_IPV6_PRIVACY
82 #include <linux/random.h>
83 #endif
84
85 #include <asm/uaccess.h>
86 #include <asm/unaligned.h>
87
88 #include <linux/proc_fs.h>
89 #include <linux/seq_file.h>
90
91 /* Set to 3 to get tracing... */
92 #define ACONF_DEBUG 2
93
94 #if ACONF_DEBUG >= 3
95 #define ADBG(x) printk x
96 #else
97 #define ADBG(x)
98 #endif
99
100 #define INFINITY_LIFE_TIME 0xFFFFFFFF
101 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102
103 #ifdef CONFIG_SYSCTL
104 static void addrconf_sysctl_register(struct inet6_dev *idev);
105 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
106 #else
107 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
108 {
109 }
110
111 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
112 {
113 }
114 #endif
115
116 #ifdef CONFIG_IPV6_PRIVACY
117 static int __ipv6_regen_rndid(struct inet6_dev *idev);
118 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
119 static void ipv6_regen_rndid(unsigned long data);
120
121 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
122 #endif
123
124 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
125 static int ipv6_count_addresses(struct inet6_dev *idev);
126
127 /*
128 * Configured unicast address hash table
129 */
130 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
131 static DEFINE_RWLOCK(addrconf_hash_lock);
132
133 static void addrconf_verify(unsigned long);
134
135 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
136 static DEFINE_SPINLOCK(addrconf_verify_lock);
137
138 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
139 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
140
141 static void addrconf_bonding_change(struct net_device *dev,
142 unsigned long event);
143 static int addrconf_ifdown(struct net_device *dev, int how);
144
145 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
146 static void addrconf_dad_timer(unsigned long data);
147 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
148 static void addrconf_dad_run(struct inet6_dev *idev);
149 static void addrconf_rs_timer(unsigned long data);
150 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
151 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
152
153 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
154 struct prefix_info *pinfo);
155 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
156 struct net_device *dev);
157
158 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
159
160 static struct ipv6_devconf ipv6_devconf __read_mostly = {
161 .forwarding = 0,
162 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
163 .mtu6 = IPV6_MIN_MTU,
164 .accept_ra = 1,
165 .accept_redirects = 1,
166 .autoconf = 1,
167 .force_mld_version = 0,
168 .dad_transmits = 1,
169 .rtr_solicits = MAX_RTR_SOLICITATIONS,
170 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
171 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
172 #ifdef CONFIG_IPV6_PRIVACY
173 .use_tempaddr = 0,
174 .temp_valid_lft = TEMP_VALID_LIFETIME,
175 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
176 .regen_max_retry = REGEN_MAX_RETRY,
177 .max_desync_factor = MAX_DESYNC_FACTOR,
178 #endif
179 .max_addresses = IPV6_MAX_ADDRESSES,
180 .accept_ra_defrtr = 1,
181 .accept_ra_pinfo = 1,
182 #ifdef CONFIG_IPV6_ROUTER_PREF
183 .accept_ra_rtr_pref = 1,
184 .rtr_probe_interval = 60 * HZ,
185 #ifdef CONFIG_IPV6_ROUTE_INFO
186 .accept_ra_rt_info_max_plen = 0,
187 #endif
188 #endif
189 .proxy_ndp = 0,
190 .accept_source_route = 0, /* we do not accept RH0 by default. */
191 .disable_ipv6 = 0,
192 .accept_dad = 1,
193 };
194
195 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
196 .forwarding = 0,
197 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
198 .mtu6 = IPV6_MIN_MTU,
199 .accept_ra = 1,
200 .accept_redirects = 1,
201 .autoconf = 1,
202 .dad_transmits = 1,
203 .rtr_solicits = MAX_RTR_SOLICITATIONS,
204 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
205 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
206 #ifdef CONFIG_IPV6_PRIVACY
207 .use_tempaddr = 0,
208 .temp_valid_lft = TEMP_VALID_LIFETIME,
209 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
210 .regen_max_retry = REGEN_MAX_RETRY,
211 .max_desync_factor = MAX_DESYNC_FACTOR,
212 #endif
213 .max_addresses = IPV6_MAX_ADDRESSES,
214 .accept_ra_defrtr = 1,
215 .accept_ra_pinfo = 1,
216 #ifdef CONFIG_IPV6_ROUTER_PREF
217 .accept_ra_rtr_pref = 1,
218 .rtr_probe_interval = 60 * HZ,
219 #ifdef CONFIG_IPV6_ROUTE_INFO
220 .accept_ra_rt_info_max_plen = 0,
221 #endif
222 #endif
223 .proxy_ndp = 0,
224 .accept_source_route = 0, /* we do not accept RH0 by default. */
225 .disable_ipv6 = 0,
226 .accept_dad = 1,
227 };
228
229 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
230 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
231 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
232 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
233 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
234
235 /* Check if a valid qdisc is available */
236 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
237 {
238 return !qdisc_tx_is_noop(dev);
239 }
240
241 /* Check if a route is valid prefix route */
242 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
243 {
244 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
245 }
246
247 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
248 {
249 if (del_timer(&ifp->timer))
250 __in6_ifa_put(ifp);
251 }
252
253 enum addrconf_timer_t
254 {
255 AC_NONE,
256 AC_DAD,
257 AC_RS,
258 };
259
260 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
261 enum addrconf_timer_t what,
262 unsigned long when)
263 {
264 if (!del_timer(&ifp->timer))
265 in6_ifa_hold(ifp);
266
267 switch (what) {
268 case AC_DAD:
269 ifp->timer.function = addrconf_dad_timer;
270 break;
271 case AC_RS:
272 ifp->timer.function = addrconf_rs_timer;
273 break;
274 default:;
275 }
276 ifp->timer.expires = jiffies + when;
277 add_timer(&ifp->timer);
278 }
279
280 static int snmp6_alloc_dev(struct inet6_dev *idev)
281 {
282 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
283 sizeof(struct ipstats_mib)) < 0)
284 goto err_ip;
285 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
286 sizeof(struct icmpv6_mib)) < 0)
287 goto err_icmp;
288 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
289 sizeof(struct icmpv6msg_mib)) < 0)
290 goto err_icmpmsg;
291
292 return 0;
293
294 err_icmpmsg:
295 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
296 err_icmp:
297 snmp_mib_free((void __percpu **)idev->stats.ipv6);
298 err_ip:
299 return -ENOMEM;
300 }
301
302 static void snmp6_free_dev(struct inet6_dev *idev)
303 {
304 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
305 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
307 }
308
309 /* Nobody refers to this device, we may destroy it. */
310
311 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
312 {
313 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
314 kfree(idev);
315 }
316
317 void in6_dev_finish_destroy(struct inet6_dev *idev)
318 {
319 struct net_device *dev = idev->dev;
320
321 WARN_ON(idev->addr_list != NULL);
322 WARN_ON(idev->mc_list != NULL);
323
324 #ifdef NET_REFCNT_DEBUG
325 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
326 #endif
327 dev_put(dev);
328 if (!idev->dead) {
329 printk("Freeing alive inet6 device %p\n", idev);
330 return;
331 }
332 snmp6_free_dev(idev);
333 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
334 }
335
336 EXPORT_SYMBOL(in6_dev_finish_destroy);
337
338 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
339 {
340 struct inet6_dev *ndev;
341
342 ASSERT_RTNL();
343
344 if (dev->mtu < IPV6_MIN_MTU)
345 return NULL;
346
347 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
348
349 if (ndev == NULL)
350 return NULL;
351
352 rwlock_init(&ndev->lock);
353 ndev->dev = dev;
354 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
355 ndev->cnf.mtu6 = dev->mtu;
356 ndev->cnf.sysctl = NULL;
357 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
358 if (ndev->nd_parms == NULL) {
359 kfree(ndev);
360 return NULL;
361 }
362 if (ndev->cnf.forwarding)
363 dev_disable_lro(dev);
364 /* We refer to the device */
365 dev_hold(dev);
366
367 if (snmp6_alloc_dev(ndev) < 0) {
368 ADBG((KERN_WARNING
369 "%s(): cannot allocate memory for statistics; dev=%s.\n",
370 __func__, dev->name));
371 neigh_parms_release(&nd_tbl, ndev->nd_parms);
372 ndev->dead = 1;
373 in6_dev_finish_destroy(ndev);
374 return NULL;
375 }
376
377 if (snmp6_register_dev(ndev) < 0) {
378 ADBG((KERN_WARNING
379 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
380 __func__, dev->name));
381 neigh_parms_release(&nd_tbl, ndev->nd_parms);
382 ndev->dead = 1;
383 in6_dev_finish_destroy(ndev);
384 return NULL;
385 }
386
387 /* One reference from device. We must do this before
388 * we invoke __ipv6_regen_rndid().
389 */
390 in6_dev_hold(ndev);
391
392 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
393 ndev->cnf.accept_dad = -1;
394
395 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
396 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
397 printk(KERN_INFO
398 "%s: Disabled Multicast RS\n",
399 dev->name);
400 ndev->cnf.rtr_solicits = 0;
401 }
402 #endif
403
404 #ifdef CONFIG_IPV6_PRIVACY
405 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
406 if ((dev->flags&IFF_LOOPBACK) ||
407 dev->type == ARPHRD_TUNNEL ||
408 dev->type == ARPHRD_TUNNEL6 ||
409 dev->type == ARPHRD_SIT ||
410 dev->type == ARPHRD_NONE) {
411 printk(KERN_INFO
412 "%s: Disabled Privacy Extensions\n",
413 dev->name);
414 ndev->cnf.use_tempaddr = -1;
415 } else {
416 in6_dev_hold(ndev);
417 ipv6_regen_rndid((unsigned long) ndev);
418 }
419 #endif
420
421 if (netif_running(dev) && addrconf_qdisc_ok(dev))
422 ndev->if_flags |= IF_READY;
423
424 ipv6_mc_init_dev(ndev);
425 ndev->tstamp = jiffies;
426 addrconf_sysctl_register(ndev);
427 /* protected by rtnl_lock */
428 rcu_assign_pointer(dev->ip6_ptr, ndev);
429
430 /* Join all-node multicast group */
431 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
432
433 return ndev;
434 }
435
436 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
437 {
438 struct inet6_dev *idev;
439
440 ASSERT_RTNL();
441
442 if ((idev = __in6_dev_get(dev)) == NULL) {
443 if ((idev = ipv6_add_dev(dev)) == NULL)
444 return NULL;
445 }
446
447 if (dev->flags&IFF_UP)
448 ipv6_mc_up(idev);
449 return idev;
450 }
451
452 #ifdef CONFIG_SYSCTL
453 static void dev_forward_change(struct inet6_dev *idev)
454 {
455 struct net_device *dev;
456 struct inet6_ifaddr *ifa;
457
458 if (!idev)
459 return;
460 dev = idev->dev;
461 if (idev->cnf.forwarding)
462 dev_disable_lro(dev);
463 if (dev && (dev->flags & IFF_MULTICAST)) {
464 if (idev->cnf.forwarding)
465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
466 else
467 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
468 }
469 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
470 if (ifa->flags&IFA_F_TENTATIVE)
471 continue;
472 if (idev->cnf.forwarding)
473 addrconf_join_anycast(ifa);
474 else
475 addrconf_leave_anycast(ifa);
476 }
477 }
478
479
480 static void addrconf_forward_change(struct net *net, __s32 newf)
481 {
482 struct net_device *dev;
483 struct inet6_dev *idev;
484
485 rcu_read_lock();
486 for_each_netdev_rcu(net, dev) {
487 idev = __in6_dev_get(dev);
488 if (idev) {
489 int changed = (!idev->cnf.forwarding) ^ (!newf);
490 idev->cnf.forwarding = newf;
491 if (changed)
492 dev_forward_change(idev);
493 }
494 }
495 rcu_read_unlock();
496 }
497
498 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
499 {
500 struct net *net;
501
502 net = (struct net *)table->extra2;
503 if (p == &net->ipv6.devconf_dflt->forwarding)
504 return 0;
505
506 if (!rtnl_trylock()) {
507 /* Restore the original values before restarting */
508 *p = old;
509 return restart_syscall();
510 }
511
512 if (p == &net->ipv6.devconf_all->forwarding) {
513 __s32 newf = net->ipv6.devconf_all->forwarding;
514 net->ipv6.devconf_dflt->forwarding = newf;
515 addrconf_forward_change(net, newf);
516 } else if ((!*p) ^ (!old))
517 dev_forward_change((struct inet6_dev *)table->extra1);
518 rtnl_unlock();
519
520 if (*p)
521 rt6_purge_dflt_routers(net);
522 return 1;
523 }
524 #endif
525
526 /* Nobody refers to this ifaddr, destroy it */
527
528 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
529 {
530 WARN_ON(ifp->if_next != NULL);
531 WARN_ON(ifp->lst_next != NULL);
532
533 #ifdef NET_REFCNT_DEBUG
534 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
535 #endif
536
537 in6_dev_put(ifp->idev);
538
539 if (del_timer(&ifp->timer))
540 printk("Timer is still running, when freeing ifa=%p\n", ifp);
541
542 if (!ifp->dead) {
543 printk("Freeing alive inet6 address %p\n", ifp);
544 return;
545 }
546 dst_release(&ifp->rt->u.dst);
547
548 kfree(ifp);
549 }
550
551 static void
552 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
553 {
554 struct inet6_ifaddr *ifa, **ifap;
555 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
556
557 /*
558 * Each device address list is sorted in order of scope -
559 * global before linklocal.
560 */
561 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
562 ifap = &ifa->if_next) {
563 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
564 break;
565 }
566
567 ifp->if_next = *ifap;
568 *ifap = ifp;
569 }
570
571 /*
572 * Hash function taken from net_alias.c
573 */
574 static u8 ipv6_addr_hash(const struct in6_addr *addr)
575 {
576 __u32 word;
577
578 /*
579 * We perform the hash function over the last 64 bits of the address
580 * This will include the IEEE address token on links that support it.
581 */
582
583 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
584 word ^= (word >> 16);
585 word ^= (word >> 8);
586
587 return ((word ^ (word >> 4)) & 0x0f);
588 }
589
590 /* On success it returns ifp with increased reference count */
591
592 static struct inet6_ifaddr *
593 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
594 int scope, u32 flags)
595 {
596 struct inet6_ifaddr *ifa = NULL;
597 struct rt6_info *rt;
598 int hash;
599 int err = 0;
600 int addr_type = ipv6_addr_type(addr);
601
602 if (addr_type == IPV6_ADDR_ANY ||
603 addr_type & IPV6_ADDR_MULTICAST ||
604 (!(idev->dev->flags & IFF_LOOPBACK) &&
605 addr_type & IPV6_ADDR_LOOPBACK))
606 return ERR_PTR(-EADDRNOTAVAIL);
607
608 rcu_read_lock_bh();
609 if (idev->dead) {
610 err = -ENODEV; /*XXX*/
611 goto out2;
612 }
613
614 if (idev->cnf.disable_ipv6) {
615 err = -EACCES;
616 goto out2;
617 }
618
619 write_lock(&addrconf_hash_lock);
620
621 /* Ignore adding duplicate addresses on an interface */
622 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
623 ADBG(("ipv6_add_addr: already assigned\n"));
624 err = -EEXIST;
625 goto out;
626 }
627
628 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
629
630 if (ifa == NULL) {
631 ADBG(("ipv6_add_addr: malloc failed\n"));
632 err = -ENOBUFS;
633 goto out;
634 }
635
636 rt = addrconf_dst_alloc(idev, addr, 0);
637 if (IS_ERR(rt)) {
638 err = PTR_ERR(rt);
639 goto out;
640 }
641
642 ipv6_addr_copy(&ifa->addr, addr);
643
644 spin_lock_init(&ifa->lock);
645 init_timer(&ifa->timer);
646 ifa->timer.data = (unsigned long) ifa;
647 ifa->scope = scope;
648 ifa->prefix_len = pfxlen;
649 ifa->flags = flags | IFA_F_TENTATIVE;
650 ifa->cstamp = ifa->tstamp = jiffies;
651
652 ifa->rt = rt;
653
654 /*
655 * part one of RFC 4429, section 3.3
656 * We should not configure an address as
657 * optimistic if we do not yet know the link
658 * layer address of our nexhop router
659 */
660
661 if (rt->rt6i_nexthop == NULL)
662 ifa->flags &= ~IFA_F_OPTIMISTIC;
663
664 ifa->idev = idev;
665 in6_dev_hold(idev);
666 /* For caller */
667 in6_ifa_hold(ifa);
668
669 /* Add to big hash table */
670 hash = ipv6_addr_hash(addr);
671
672 ifa->lst_next = inet6_addr_lst[hash];
673 inet6_addr_lst[hash] = ifa;
674 in6_ifa_hold(ifa);
675 write_unlock(&addrconf_hash_lock);
676
677 write_lock(&idev->lock);
678 /* Add to inet6_dev unicast addr list. */
679 ipv6_link_dev_addr(idev, ifa);
680
681 #ifdef CONFIG_IPV6_PRIVACY
682 if (ifa->flags&IFA_F_TEMPORARY) {
683 ifa->tmp_next = idev->tempaddr_list;
684 idev->tempaddr_list = ifa;
685 in6_ifa_hold(ifa);
686 }
687 #endif
688
689 in6_ifa_hold(ifa);
690 write_unlock(&idev->lock);
691 out2:
692 rcu_read_unlock_bh();
693
694 if (likely(err == 0))
695 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
696 else {
697 kfree(ifa);
698 ifa = ERR_PTR(err);
699 }
700
701 return ifa;
702 out:
703 write_unlock(&addrconf_hash_lock);
704 goto out2;
705 }
706
707 /* This function wants to get referenced ifp and releases it before return */
708
709 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
710 {
711 struct inet6_ifaddr *ifa, **ifap;
712 struct inet6_dev *idev = ifp->idev;
713 int hash;
714 int deleted = 0, onlink = 0;
715 unsigned long expires = jiffies;
716
717 hash = ipv6_addr_hash(&ifp->addr);
718
719 ifp->dead = 1;
720
721 write_lock_bh(&addrconf_hash_lock);
722 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
723 ifap = &ifa->lst_next) {
724 if (ifa == ifp) {
725 *ifap = ifa->lst_next;
726 __in6_ifa_put(ifp);
727 ifa->lst_next = NULL;
728 break;
729 }
730 }
731 write_unlock_bh(&addrconf_hash_lock);
732
733 write_lock_bh(&idev->lock);
734 #ifdef CONFIG_IPV6_PRIVACY
735 if (ifp->flags&IFA_F_TEMPORARY) {
736 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
737 ifap = &ifa->tmp_next) {
738 if (ifa == ifp) {
739 *ifap = ifa->tmp_next;
740 if (ifp->ifpub) {
741 in6_ifa_put(ifp->ifpub);
742 ifp->ifpub = NULL;
743 }
744 __in6_ifa_put(ifp);
745 ifa->tmp_next = NULL;
746 break;
747 }
748 }
749 }
750 #endif
751
752 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
753 if (ifa == ifp) {
754 *ifap = ifa->if_next;
755 __in6_ifa_put(ifp);
756 ifa->if_next = NULL;
757 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
758 break;
759 deleted = 1;
760 continue;
761 } else if (ifp->flags & IFA_F_PERMANENT) {
762 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
763 ifp->prefix_len)) {
764 if (ifa->flags & IFA_F_PERMANENT) {
765 onlink = 1;
766 if (deleted)
767 break;
768 } else {
769 unsigned long lifetime;
770
771 if (!onlink)
772 onlink = -1;
773
774 spin_lock(&ifa->lock);
775
776 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
777 /*
778 * Note: Because this address is
779 * not permanent, lifetime <
780 * LONG_MAX / HZ here.
781 */
782 if (time_before(expires,
783 ifa->tstamp + lifetime * HZ))
784 expires = ifa->tstamp + lifetime * HZ;
785 spin_unlock(&ifa->lock);
786 }
787 }
788 }
789 ifap = &ifa->if_next;
790 }
791 write_unlock_bh(&idev->lock);
792
793 addrconf_del_timer(ifp);
794
795 ipv6_ifa_notify(RTM_DELADDR, ifp);
796
797 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
798
799 /*
800 * Purge or update corresponding prefix
801 *
802 * 1) we don't purge prefix here if address was not permanent.
803 * prefix is managed by its own lifetime.
804 * 2) if there're no addresses, delete prefix.
805 * 3) if there're still other permanent address(es),
806 * corresponding prefix is still permanent.
807 * 4) otherwise, update prefix lifetime to the
808 * longest valid lifetime among the corresponding
809 * addresses on the device.
810 * Note: subsequent RA will update lifetime.
811 *
812 * --yoshfuji
813 */
814 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
815 struct in6_addr prefix;
816 struct rt6_info *rt;
817 struct net *net = dev_net(ifp->idev->dev);
818 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
819 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
820
821 if (rt && addrconf_is_prefix_route(rt)) {
822 if (onlink == 0) {
823 ip6_del_rt(rt);
824 rt = NULL;
825 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
826 rt->rt6i_expires = expires;
827 rt->rt6i_flags |= RTF_EXPIRES;
828 }
829 }
830 dst_release(&rt->u.dst);
831 }
832
833 in6_ifa_put(ifp);
834 }
835
836 #ifdef CONFIG_IPV6_PRIVACY
837 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
838 {
839 struct inet6_dev *idev = ifp->idev;
840 struct in6_addr addr, *tmpaddr;
841 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
842 unsigned long regen_advance;
843 int tmp_plen;
844 int ret = 0;
845 int max_addresses;
846 u32 addr_flags;
847
848 write_lock(&idev->lock);
849 if (ift) {
850 spin_lock_bh(&ift->lock);
851 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
852 spin_unlock_bh(&ift->lock);
853 tmpaddr = &addr;
854 } else {
855 tmpaddr = NULL;
856 }
857 retry:
858 in6_dev_hold(idev);
859 if (idev->cnf.use_tempaddr <= 0) {
860 write_unlock(&idev->lock);
861 printk(KERN_INFO
862 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
863 in6_dev_put(idev);
864 ret = -1;
865 goto out;
866 }
867 spin_lock_bh(&ifp->lock);
868 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
869 idev->cnf.use_tempaddr = -1; /*XXX*/
870 spin_unlock_bh(&ifp->lock);
871 write_unlock(&idev->lock);
872 printk(KERN_WARNING
873 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
874 in6_dev_put(idev);
875 ret = -1;
876 goto out;
877 }
878 in6_ifa_hold(ifp);
879 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
880 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
881 spin_unlock_bh(&ifp->lock);
882 write_unlock(&idev->lock);
883 printk(KERN_WARNING
884 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
885 in6_ifa_put(ifp);
886 in6_dev_put(idev);
887 ret = -1;
888 goto out;
889 }
890 memcpy(&addr.s6_addr[8], idev->rndid, 8);
891 tmp_valid_lft = min_t(__u32,
892 ifp->valid_lft,
893 idev->cnf.temp_valid_lft);
894 tmp_prefered_lft = min_t(__u32,
895 ifp->prefered_lft,
896 idev->cnf.temp_prefered_lft - desync_factor / HZ);
897 tmp_plen = ifp->prefix_len;
898 max_addresses = idev->cnf.max_addresses;
899 tmp_cstamp = ifp->cstamp;
900 tmp_tstamp = ifp->tstamp;
901 spin_unlock_bh(&ifp->lock);
902
903 regen_advance = idev->cnf.regen_max_retry *
904 idev->cnf.dad_transmits *
905 idev->nd_parms->retrans_time / HZ;
906 write_unlock(&idev->lock);
907
908 /* A temporary address is created only if this calculated Preferred
909 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
910 * an implementation must not create a temporary address with a zero
911 * Preferred Lifetime.
912 */
913 if (tmp_prefered_lft <= regen_advance) {
914 in6_ifa_put(ifp);
915 in6_dev_put(idev);
916 ret = -1;
917 goto out;
918 }
919
920 addr_flags = IFA_F_TEMPORARY;
921 /* set in addrconf_prefix_rcv() */
922 if (ifp->flags & IFA_F_OPTIMISTIC)
923 addr_flags |= IFA_F_OPTIMISTIC;
924
925 ift = !max_addresses ||
926 ipv6_count_addresses(idev) < max_addresses ?
927 ipv6_add_addr(idev, &addr, tmp_plen,
928 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
929 addr_flags) : NULL;
930 if (!ift || IS_ERR(ift)) {
931 in6_ifa_put(ifp);
932 in6_dev_put(idev);
933 printk(KERN_INFO
934 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
935 tmpaddr = &addr;
936 write_lock(&idev->lock);
937 goto retry;
938 }
939
940 spin_lock_bh(&ift->lock);
941 ift->ifpub = ifp;
942 ift->valid_lft = tmp_valid_lft;
943 ift->prefered_lft = tmp_prefered_lft;
944 ift->cstamp = tmp_cstamp;
945 ift->tstamp = tmp_tstamp;
946 spin_unlock_bh(&ift->lock);
947
948 addrconf_dad_start(ift, 0);
949 in6_ifa_put(ift);
950 in6_dev_put(idev);
951 out:
952 return ret;
953 }
954 #endif
955
956 /*
957 * Choose an appropriate source address (RFC3484)
958 */
959 enum {
960 IPV6_SADDR_RULE_INIT = 0,
961 IPV6_SADDR_RULE_LOCAL,
962 IPV6_SADDR_RULE_SCOPE,
963 IPV6_SADDR_RULE_PREFERRED,
964 #ifdef CONFIG_IPV6_MIP6
965 IPV6_SADDR_RULE_HOA,
966 #endif
967 IPV6_SADDR_RULE_OIF,
968 IPV6_SADDR_RULE_LABEL,
969 #ifdef CONFIG_IPV6_PRIVACY
970 IPV6_SADDR_RULE_PRIVACY,
971 #endif
972 IPV6_SADDR_RULE_ORCHID,
973 IPV6_SADDR_RULE_PREFIX,
974 IPV6_SADDR_RULE_MAX
975 };
976
977 struct ipv6_saddr_score {
978 int rule;
979 int addr_type;
980 struct inet6_ifaddr *ifa;
981 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
982 int scopedist;
983 int matchlen;
984 };
985
986 struct ipv6_saddr_dst {
987 const struct in6_addr *addr;
988 int ifindex;
989 int scope;
990 int label;
991 unsigned int prefs;
992 };
993
994 static inline int ipv6_saddr_preferred(int type)
995 {
996 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
997 return 1;
998 return 0;
999 }
1000
1001 static int ipv6_get_saddr_eval(struct net *net,
1002 struct ipv6_saddr_score *score,
1003 struct ipv6_saddr_dst *dst,
1004 int i)
1005 {
1006 int ret;
1007
1008 if (i <= score->rule) {
1009 switch (i) {
1010 case IPV6_SADDR_RULE_SCOPE:
1011 ret = score->scopedist;
1012 break;
1013 case IPV6_SADDR_RULE_PREFIX:
1014 ret = score->matchlen;
1015 break;
1016 default:
1017 ret = !!test_bit(i, score->scorebits);
1018 }
1019 goto out;
1020 }
1021
1022 switch (i) {
1023 case IPV6_SADDR_RULE_INIT:
1024 /* Rule 0: remember if hiscore is not ready yet */
1025 ret = !!score->ifa;
1026 break;
1027 case IPV6_SADDR_RULE_LOCAL:
1028 /* Rule 1: Prefer same address */
1029 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1030 break;
1031 case IPV6_SADDR_RULE_SCOPE:
1032 /* Rule 2: Prefer appropriate scope
1033 *
1034 * ret
1035 * ^
1036 * -1 | d 15
1037 * ---+--+-+---> scope
1038 * |
1039 * | d is scope of the destination.
1040 * B-d | \
1041 * | \ <- smaller scope is better if
1042 * B-15 | \ if scope is enough for destinaion.
1043 * | ret = B - scope (-1 <= scope >= d <= 15).
1044 * d-C-1 | /
1045 * |/ <- greater is better
1046 * -C / if scope is not enough for destination.
1047 * /| ret = scope - C (-1 <= d < scope <= 15).
1048 *
1049 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1050 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1051 * Assume B = 0 and we get C > 29.
1052 */
1053 ret = __ipv6_addr_src_scope(score->addr_type);
1054 if (ret >= dst->scope)
1055 ret = -ret;
1056 else
1057 ret -= 128; /* 30 is enough */
1058 score->scopedist = ret;
1059 break;
1060 case IPV6_SADDR_RULE_PREFERRED:
1061 /* Rule 3: Avoid deprecated and optimistic addresses */
1062 ret = ipv6_saddr_preferred(score->addr_type) ||
1063 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1064 break;
1065 #ifdef CONFIG_IPV6_MIP6
1066 case IPV6_SADDR_RULE_HOA:
1067 {
1068 /* Rule 4: Prefer home address */
1069 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1070 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1071 break;
1072 }
1073 #endif
1074 case IPV6_SADDR_RULE_OIF:
1075 /* Rule 5: Prefer outgoing interface */
1076 ret = (!dst->ifindex ||
1077 dst->ifindex == score->ifa->idev->dev->ifindex);
1078 break;
1079 case IPV6_SADDR_RULE_LABEL:
1080 /* Rule 6: Prefer matching label */
1081 ret = ipv6_addr_label(net,
1082 &score->ifa->addr, score->addr_type,
1083 score->ifa->idev->dev->ifindex) == dst->label;
1084 break;
1085 #ifdef CONFIG_IPV6_PRIVACY
1086 case IPV6_SADDR_RULE_PRIVACY:
1087 {
1088 /* Rule 7: Prefer public address
1089 * Note: prefer temprary address if use_tempaddr >= 2
1090 */
1091 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1092 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1093 score->ifa->idev->cnf.use_tempaddr >= 2;
1094 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1095 break;
1096 }
1097 #endif
1098 case IPV6_SADDR_RULE_ORCHID:
1099 /* Rule 8-: Prefer ORCHID vs ORCHID or
1100 * non-ORCHID vs non-ORCHID
1101 */
1102 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1103 ipv6_addr_orchid(dst->addr));
1104 break;
1105 case IPV6_SADDR_RULE_PREFIX:
1106 /* Rule 8: Use longest matching prefix */
1107 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1108 dst->addr);
1109 break;
1110 default:
1111 ret = 0;
1112 }
1113
1114 if (ret)
1115 __set_bit(i, score->scorebits);
1116 score->rule = i;
1117 out:
1118 return ret;
1119 }
1120
1121 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1122 const struct in6_addr *daddr, unsigned int prefs,
1123 struct in6_addr *saddr)
1124 {
1125 struct ipv6_saddr_score scores[2],
1126 *score = &scores[0], *hiscore = &scores[1];
1127 struct ipv6_saddr_dst dst;
1128 struct net_device *dev;
1129 int dst_type;
1130
1131 dst_type = __ipv6_addr_type(daddr);
1132 dst.addr = daddr;
1133 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1134 dst.scope = __ipv6_addr_src_scope(dst_type);
1135 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1136 dst.prefs = prefs;
1137
1138 hiscore->rule = -1;
1139 hiscore->ifa = NULL;
1140
1141 rcu_read_lock();
1142
1143 for_each_netdev_rcu(net, dev) {
1144 struct inet6_dev *idev;
1145
1146 /* Candidate Source Address (section 4)
1147 * - multicast and link-local destination address,
1148 * the set of candidate source address MUST only
1149 * include addresses assigned to interfaces
1150 * belonging to the same link as the outgoing
1151 * interface.
1152 * (- For site-local destination addresses, the
1153 * set of candidate source addresses MUST only
1154 * include addresses assigned to interfaces
1155 * belonging to the same site as the outgoing
1156 * interface.)
1157 */
1158 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1159 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1160 dst.ifindex && dev->ifindex != dst.ifindex)
1161 continue;
1162
1163 idev = __in6_dev_get(dev);
1164 if (!idev)
1165 continue;
1166
1167 read_lock_bh(&idev->lock);
1168 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1169 int i;
1170
1171 /*
1172 * - Tentative Address (RFC2462 section 5.4)
1173 * - A tentative address is not considered
1174 * "assigned to an interface" in the traditional
1175 * sense, unless it is also flagged as optimistic.
1176 * - Candidate Source Address (section 4)
1177 * - In any case, anycast addresses, multicast
1178 * addresses, and the unspecified address MUST
1179 * NOT be included in a candidate set.
1180 */
1181 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1182 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1183 continue;
1184
1185 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1186
1187 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1188 score->addr_type & IPV6_ADDR_MULTICAST)) {
1189 LIMIT_NETDEBUG(KERN_DEBUG
1190 "ADDRCONF: unspecified / multicast address "
1191 "assigned as unicast address on %s",
1192 dev->name);
1193 continue;
1194 }
1195
1196 score->rule = -1;
1197 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1198
1199 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1200 int minihiscore, miniscore;
1201
1202 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1203 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1204
1205 if (minihiscore > miniscore) {
1206 if (i == IPV6_SADDR_RULE_SCOPE &&
1207 score->scopedist > 0) {
1208 /*
1209 * special case:
1210 * each remaining entry
1211 * has too small (not enough)
1212 * scope, because ifa entries
1213 * are sorted by their scope
1214 * values.
1215 */
1216 goto try_nextdev;
1217 }
1218 break;
1219 } else if (minihiscore < miniscore) {
1220 if (hiscore->ifa)
1221 in6_ifa_put(hiscore->ifa);
1222
1223 in6_ifa_hold(score->ifa);
1224
1225 swap(hiscore, score);
1226
1227 /* restore our iterator */
1228 score->ifa = hiscore->ifa;
1229
1230 break;
1231 }
1232 }
1233 }
1234 try_nextdev:
1235 read_unlock_bh(&idev->lock);
1236 }
1237 rcu_read_unlock();
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, int dad_failed)
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 if (dad_failed)
1382 ifp->flags |= IFA_F_DADFAILED;
1383 spin_unlock_bh(&ifp->lock);
1384 if (dad_failed)
1385 ipv6_ifa_notify(0, ifp);
1386 in6_ifa_put(ifp);
1387 #ifdef CONFIG_IPV6_PRIVACY
1388 } else if (ifp->flags&IFA_F_TEMPORARY) {
1389 struct inet6_ifaddr *ifpub;
1390 spin_lock_bh(&ifp->lock);
1391 ifpub = ifp->ifpub;
1392 if (ifpub) {
1393 in6_ifa_hold(ifpub);
1394 spin_unlock_bh(&ifp->lock);
1395 ipv6_create_tempaddr(ifpub, ifp);
1396 in6_ifa_put(ifpub);
1397 } else {
1398 spin_unlock_bh(&ifp->lock);
1399 }
1400 ipv6_del_addr(ifp);
1401 #endif
1402 } else
1403 ipv6_del_addr(ifp);
1404 }
1405
1406 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1407 {
1408 struct inet6_dev *idev = ifp->idev;
1409
1410 if (net_ratelimit())
1411 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1412 ifp->idev->dev->name, &ifp->addr);
1413
1414 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1415 struct in6_addr addr;
1416
1417 addr.s6_addr32[0] = htonl(0xfe800000);
1418 addr.s6_addr32[1] = 0;
1419
1420 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1421 ipv6_addr_equal(&ifp->addr, &addr)) {
1422 /* DAD failed for link-local based on MAC address */
1423 idev->cnf.disable_ipv6 = 1;
1424
1425 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1426 ifp->idev->dev->name);
1427 }
1428 }
1429
1430 addrconf_dad_stop(ifp, 1);
1431 }
1432
1433 /* Join to solicited addr multicast group. */
1434
1435 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1436 {
1437 struct in6_addr maddr;
1438
1439 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1440 return;
1441
1442 addrconf_addr_solict_mult(addr, &maddr);
1443 ipv6_dev_mc_inc(dev, &maddr);
1444 }
1445
1446 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1447 {
1448 struct in6_addr maddr;
1449
1450 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1451 return;
1452
1453 addrconf_addr_solict_mult(addr, &maddr);
1454 __ipv6_dev_mc_dec(idev, &maddr);
1455 }
1456
1457 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1458 {
1459 struct in6_addr addr;
1460 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1461 if (ipv6_addr_any(&addr))
1462 return;
1463 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1464 }
1465
1466 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1467 {
1468 struct in6_addr addr;
1469 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1470 if (ipv6_addr_any(&addr))
1471 return;
1472 __ipv6_dev_ac_dec(ifp->idev, &addr);
1473 }
1474
1475 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1476 {
1477 if (dev->addr_len != ETH_ALEN)
1478 return -1;
1479 memcpy(eui, dev->dev_addr, 3);
1480 memcpy(eui + 5, dev->dev_addr + 3, 3);
1481
1482 /*
1483 * The zSeries OSA network cards can be shared among various
1484 * OS instances, but the OSA cards have only one MAC address.
1485 * This leads to duplicate address conflicts in conjunction
1486 * with IPv6 if more than one instance uses the same card.
1487 *
1488 * The driver for these cards can deliver a unique 16-bit
1489 * identifier for each instance sharing the same card. It is
1490 * placed instead of 0xFFFE in the interface identifier. The
1491 * "u" bit of the interface identifier is not inverted in this
1492 * case. Hence the resulting interface identifier has local
1493 * scope according to RFC2373.
1494 */
1495 if (dev->dev_id) {
1496 eui[3] = (dev->dev_id >> 8) & 0xFF;
1497 eui[4] = dev->dev_id & 0xFF;
1498 } else {
1499 eui[3] = 0xFF;
1500 eui[4] = 0xFE;
1501 eui[0] ^= 2;
1502 }
1503 return 0;
1504 }
1505
1506 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1507 {
1508 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1509 if (dev->addr_len != ARCNET_ALEN)
1510 return -1;
1511 memset(eui, 0, 7);
1512 eui[7] = *(u8*)dev->dev_addr;
1513 return 0;
1514 }
1515
1516 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1517 {
1518 if (dev->addr_len != INFINIBAND_ALEN)
1519 return -1;
1520 memcpy(eui, dev->dev_addr + 12, 8);
1521 eui[0] |= 2;
1522 return 0;
1523 }
1524
1525 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1526 {
1527 if (addr == 0)
1528 return -1;
1529 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1530 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1531 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1532 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1533 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1534 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1535 eui[1] = 0;
1536 eui[2] = 0x5E;
1537 eui[3] = 0xFE;
1538 memcpy(eui + 4, &addr, 4);
1539 return 0;
1540 }
1541 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1542
1543 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1544 {
1545 if (dev->priv_flags & IFF_ISATAP)
1546 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1547 return -1;
1548 }
1549
1550 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1551 {
1552 switch (dev->type) {
1553 case ARPHRD_ETHER:
1554 case ARPHRD_FDDI:
1555 case ARPHRD_IEEE802_TR:
1556 return addrconf_ifid_eui48(eui, dev);
1557 case ARPHRD_ARCNET:
1558 return addrconf_ifid_arcnet(eui, dev);
1559 case ARPHRD_INFINIBAND:
1560 return addrconf_ifid_infiniband(eui, dev);
1561 case ARPHRD_SIT:
1562 return addrconf_ifid_sit(eui, dev);
1563 }
1564 return -1;
1565 }
1566
1567 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1568 {
1569 int err = -1;
1570 struct inet6_ifaddr *ifp;
1571
1572 read_lock_bh(&idev->lock);
1573 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1574 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1575 memcpy(eui, ifp->addr.s6_addr+8, 8);
1576 err = 0;
1577 break;
1578 }
1579 }
1580 read_unlock_bh(&idev->lock);
1581 return err;
1582 }
1583
1584 #ifdef CONFIG_IPV6_PRIVACY
1585 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1586 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1587 {
1588 regen:
1589 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1590 idev->rndid[0] &= ~0x02;
1591
1592 /*
1593 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1594 * check if generated address is not inappropriate
1595 *
1596 * - Reserved subnet anycast (RFC 2526)
1597 * 11111101 11....11 1xxxxxxx
1598 * - ISATAP (RFC4214) 6.1
1599 * 00-00-5E-FE-xx-xx-xx-xx
1600 * - value 0
1601 * - XXX: already assigned to an address on the device
1602 */
1603 if (idev->rndid[0] == 0xfd &&
1604 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1605 (idev->rndid[7]&0x80))
1606 goto regen;
1607 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1608 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1609 goto regen;
1610 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1611 goto regen;
1612 }
1613
1614 return 0;
1615 }
1616
1617 static void ipv6_regen_rndid(unsigned long data)
1618 {
1619 struct inet6_dev *idev = (struct inet6_dev *) data;
1620 unsigned long expires;
1621
1622 rcu_read_lock_bh();
1623 write_lock_bh(&idev->lock);
1624
1625 if (idev->dead)
1626 goto out;
1627
1628 if (__ipv6_regen_rndid(idev) < 0)
1629 goto out;
1630
1631 expires = jiffies +
1632 idev->cnf.temp_prefered_lft * HZ -
1633 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1634 if (time_before(expires, jiffies)) {
1635 printk(KERN_WARNING
1636 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1637 idev->dev->name);
1638 goto out;
1639 }
1640
1641 if (!mod_timer(&idev->regen_timer, expires))
1642 in6_dev_hold(idev);
1643
1644 out:
1645 write_unlock_bh(&idev->lock);
1646 rcu_read_unlock_bh();
1647 in6_dev_put(idev);
1648 }
1649
1650 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1651 int ret = 0;
1652
1653 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1654 ret = __ipv6_regen_rndid(idev);
1655 return ret;
1656 }
1657 #endif
1658
1659 /*
1660 * Add prefix route.
1661 */
1662
1663 static void
1664 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1665 unsigned long expires, u32 flags)
1666 {
1667 struct fib6_config cfg = {
1668 .fc_table = RT6_TABLE_PREFIX,
1669 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1670 .fc_ifindex = dev->ifindex,
1671 .fc_expires = expires,
1672 .fc_dst_len = plen,
1673 .fc_flags = RTF_UP | flags,
1674 .fc_nlinfo.nl_net = dev_net(dev),
1675 .fc_protocol = RTPROT_KERNEL,
1676 };
1677
1678 ipv6_addr_copy(&cfg.fc_dst, pfx);
1679
1680 /* Prevent useless cloning on PtP SIT.
1681 This thing is done here expecting that the whole
1682 class of non-broadcast devices need not cloning.
1683 */
1684 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1685 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1686 cfg.fc_flags |= RTF_NONEXTHOP;
1687 #endif
1688
1689 ip6_route_add(&cfg);
1690 }
1691
1692 /* Create "default" multicast route to the interface */
1693
1694 static void addrconf_add_mroute(struct net_device *dev)
1695 {
1696 struct fib6_config cfg = {
1697 .fc_table = RT6_TABLE_LOCAL,
1698 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1699 .fc_ifindex = dev->ifindex,
1700 .fc_dst_len = 8,
1701 .fc_flags = RTF_UP,
1702 .fc_nlinfo.nl_net = dev_net(dev),
1703 };
1704
1705 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1706
1707 ip6_route_add(&cfg);
1708 }
1709
1710 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1711 static void sit_route_add(struct net_device *dev)
1712 {
1713 struct fib6_config cfg = {
1714 .fc_table = RT6_TABLE_MAIN,
1715 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1716 .fc_ifindex = dev->ifindex,
1717 .fc_dst_len = 96,
1718 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1719 .fc_nlinfo.nl_net = dev_net(dev),
1720 };
1721
1722 /* prefix length - 96 bits "::d.d.d.d" */
1723 ip6_route_add(&cfg);
1724 }
1725 #endif
1726
1727 static void addrconf_add_lroute(struct net_device *dev)
1728 {
1729 struct in6_addr addr;
1730
1731 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1732 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1733 }
1734
1735 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1736 {
1737 struct inet6_dev *idev;
1738
1739 ASSERT_RTNL();
1740
1741 if ((idev = ipv6_find_idev(dev)) == NULL)
1742 return NULL;
1743
1744 /* Add default multicast route */
1745 addrconf_add_mroute(dev);
1746
1747 /* Add link local route */
1748 addrconf_add_lroute(dev);
1749 return idev;
1750 }
1751
1752 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1753 {
1754 struct prefix_info *pinfo;
1755 __u32 valid_lft;
1756 __u32 prefered_lft;
1757 int addr_type;
1758 struct inet6_dev *in6_dev;
1759 struct net *net = dev_net(dev);
1760
1761 pinfo = (struct prefix_info *) opt;
1762
1763 if (len < sizeof(struct prefix_info)) {
1764 ADBG(("addrconf: prefix option too short\n"));
1765 return;
1766 }
1767
1768 /*
1769 * Validation checks ([ADDRCONF], page 19)
1770 */
1771
1772 addr_type = ipv6_addr_type(&pinfo->prefix);
1773
1774 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1775 return;
1776
1777 valid_lft = ntohl(pinfo->valid);
1778 prefered_lft = ntohl(pinfo->prefered);
1779
1780 if (prefered_lft > valid_lft) {
1781 if (net_ratelimit())
1782 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1783 return;
1784 }
1785
1786 in6_dev = in6_dev_get(dev);
1787
1788 if (in6_dev == NULL) {
1789 if (net_ratelimit())
1790 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1791 return;
1792 }
1793
1794 /*
1795 * Two things going on here:
1796 * 1) Add routes for on-link prefixes
1797 * 2) Configure prefixes with the auto flag set
1798 */
1799
1800 if (pinfo->onlink) {
1801 struct rt6_info *rt;
1802 unsigned long rt_expires;
1803
1804 /* Avoid arithmetic overflow. Really, we could
1805 * save rt_expires in seconds, likely valid_lft,
1806 * but it would require division in fib gc, that it
1807 * not good.
1808 */
1809 if (HZ > USER_HZ)
1810 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1811 else
1812 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1813
1814 if (addrconf_finite_timeout(rt_expires))
1815 rt_expires *= HZ;
1816
1817 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1818 dev->ifindex, 1);
1819
1820 if (rt && addrconf_is_prefix_route(rt)) {
1821 /* Autoconf prefix route */
1822 if (valid_lft == 0) {
1823 ip6_del_rt(rt);
1824 rt = NULL;
1825 } else if (addrconf_finite_timeout(rt_expires)) {
1826 /* not infinity */
1827 rt->rt6i_expires = jiffies + rt_expires;
1828 rt->rt6i_flags |= RTF_EXPIRES;
1829 } else {
1830 rt->rt6i_flags &= ~RTF_EXPIRES;
1831 rt->rt6i_expires = 0;
1832 }
1833 } else if (valid_lft) {
1834 clock_t expires = 0;
1835 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1836 if (addrconf_finite_timeout(rt_expires)) {
1837 /* not infinity */
1838 flags |= RTF_EXPIRES;
1839 expires = jiffies_to_clock_t(rt_expires);
1840 }
1841 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1842 dev, expires, flags);
1843 }
1844 if (rt)
1845 dst_release(&rt->u.dst);
1846 }
1847
1848 /* Try to figure out our local address for this prefix */
1849
1850 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1851 struct inet6_ifaddr * ifp;
1852 struct in6_addr addr;
1853 int create = 0, update_lft = 0;
1854
1855 if (pinfo->prefix_len == 64) {
1856 memcpy(&addr, &pinfo->prefix, 8);
1857 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1858 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1859 in6_dev_put(in6_dev);
1860 return;
1861 }
1862 goto ok;
1863 }
1864 if (net_ratelimit())
1865 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1866 pinfo->prefix_len);
1867 in6_dev_put(in6_dev);
1868 return;
1869
1870 ok:
1871
1872 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1873
1874 if (ifp == NULL && valid_lft) {
1875 int max_addresses = in6_dev->cnf.max_addresses;
1876 u32 addr_flags = 0;
1877
1878 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1879 if (in6_dev->cnf.optimistic_dad &&
1880 !net->ipv6.devconf_all->forwarding)
1881 addr_flags = IFA_F_OPTIMISTIC;
1882 #endif
1883
1884 /* Do not allow to create too much of autoconfigured
1885 * addresses; this would be too easy way to crash kernel.
1886 */
1887 if (!max_addresses ||
1888 ipv6_count_addresses(in6_dev) < max_addresses)
1889 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1890 addr_type&IPV6_ADDR_SCOPE_MASK,
1891 addr_flags);
1892
1893 if (!ifp || IS_ERR(ifp)) {
1894 in6_dev_put(in6_dev);
1895 return;
1896 }
1897
1898 update_lft = create = 1;
1899 ifp->cstamp = jiffies;
1900 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1901 }
1902
1903 if (ifp) {
1904 int flags;
1905 unsigned long now;
1906 #ifdef CONFIG_IPV6_PRIVACY
1907 struct inet6_ifaddr *ift;
1908 #endif
1909 u32 stored_lft;
1910
1911 /* update lifetime (RFC2462 5.5.3 e) */
1912 spin_lock(&ifp->lock);
1913 now = jiffies;
1914 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1915 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1916 else
1917 stored_lft = 0;
1918 if (!update_lft && stored_lft) {
1919 if (valid_lft > MIN_VALID_LIFETIME ||
1920 valid_lft > stored_lft)
1921 update_lft = 1;
1922 else if (stored_lft <= MIN_VALID_LIFETIME) {
1923 /* valid_lft <= stored_lft is always true */
1924 /*
1925 * RFC 4862 Section 5.5.3e:
1926 * "Note that the preferred lifetime of
1927 * the corresponding address is always
1928 * reset to the Preferred Lifetime in
1929 * the received Prefix Information
1930 * option, regardless of whether the
1931 * valid lifetime is also reset or
1932 * ignored."
1933 *
1934 * So if the preferred lifetime in
1935 * this advertisement is different
1936 * than what we have stored, but the
1937 * valid lifetime is invalid, just
1938 * reset prefered_lft.
1939 *
1940 * We must set the valid lifetime
1941 * to the stored lifetime since we'll
1942 * be updating the timestamp below,
1943 * else we'll set it back to the
1944 * minumum.
1945 */
1946 if (prefered_lft != ifp->prefered_lft) {
1947 valid_lft = stored_lft;
1948 update_lft = 1;
1949 }
1950 } else {
1951 valid_lft = MIN_VALID_LIFETIME;
1952 if (valid_lft < prefered_lft)
1953 prefered_lft = valid_lft;
1954 update_lft = 1;
1955 }
1956 }
1957
1958 if (update_lft) {
1959 ifp->valid_lft = valid_lft;
1960 ifp->prefered_lft = prefered_lft;
1961 ifp->tstamp = now;
1962 flags = ifp->flags;
1963 ifp->flags &= ~IFA_F_DEPRECATED;
1964 spin_unlock(&ifp->lock);
1965
1966 if (!(flags&IFA_F_TENTATIVE))
1967 ipv6_ifa_notify(0, ifp);
1968 } else
1969 spin_unlock(&ifp->lock);
1970
1971 #ifdef CONFIG_IPV6_PRIVACY
1972 read_lock_bh(&in6_dev->lock);
1973 /* update all temporary addresses in the list */
1974 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1975 /*
1976 * When adjusting the lifetimes of an existing
1977 * temporary address, only lower the lifetimes.
1978 * Implementations must not increase the
1979 * lifetimes of an existing temporary address
1980 * when processing a Prefix Information Option.
1981 */
1982 if (ifp != ift->ifpub)
1983 continue;
1984
1985 spin_lock(&ift->lock);
1986 flags = ift->flags;
1987 if (ift->valid_lft > valid_lft &&
1988 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1989 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1990 if (ift->prefered_lft > prefered_lft &&
1991 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1992 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1993 spin_unlock(&ift->lock);
1994 if (!(flags&IFA_F_TENTATIVE))
1995 ipv6_ifa_notify(0, ift);
1996 }
1997
1998 if (create && in6_dev->cnf.use_tempaddr > 0) {
1999 /*
2000 * When a new public address is created as described in [ADDRCONF],
2001 * also create a new temporary address.
2002 */
2003 read_unlock_bh(&in6_dev->lock);
2004 ipv6_create_tempaddr(ifp, NULL);
2005 } else {
2006 read_unlock_bh(&in6_dev->lock);
2007 }
2008 #endif
2009 in6_ifa_put(ifp);
2010 addrconf_verify(0);
2011 }
2012 }
2013 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2014 in6_dev_put(in6_dev);
2015 }
2016
2017 /*
2018 * Set destination address.
2019 * Special case for SIT interfaces where we create a new "virtual"
2020 * device.
2021 */
2022 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2023 {
2024 struct in6_ifreq ireq;
2025 struct net_device *dev;
2026 int err = -EINVAL;
2027
2028 rtnl_lock();
2029
2030 err = -EFAULT;
2031 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2032 goto err_exit;
2033
2034 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2035
2036 err = -ENODEV;
2037 if (dev == NULL)
2038 goto err_exit;
2039
2040 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2041 if (dev->type == ARPHRD_SIT) {
2042 const struct net_device_ops *ops = dev->netdev_ops;
2043 struct ifreq ifr;
2044 struct ip_tunnel_parm p;
2045
2046 err = -EADDRNOTAVAIL;
2047 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2048 goto err_exit;
2049
2050 memset(&p, 0, sizeof(p));
2051 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2052 p.iph.saddr = 0;
2053 p.iph.version = 4;
2054 p.iph.ihl = 5;
2055 p.iph.protocol = IPPROTO_IPV6;
2056 p.iph.ttl = 64;
2057 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2058
2059 if (ops->ndo_do_ioctl) {
2060 mm_segment_t oldfs = get_fs();
2061
2062 set_fs(KERNEL_DS);
2063 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2064 set_fs(oldfs);
2065 } else
2066 err = -EOPNOTSUPP;
2067
2068 if (err == 0) {
2069 err = -ENOBUFS;
2070 dev = __dev_get_by_name(net, p.name);
2071 if (!dev)
2072 goto err_exit;
2073 err = dev_open(dev);
2074 }
2075 }
2076 #endif
2077
2078 err_exit:
2079 rtnl_unlock();
2080 return err;
2081 }
2082
2083 /*
2084 * Manual configuration of address on an interface
2085 */
2086 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2087 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2088 __u32 valid_lft)
2089 {
2090 struct inet6_ifaddr *ifp;
2091 struct inet6_dev *idev;
2092 struct net_device *dev;
2093 int scope;
2094 u32 flags;
2095 clock_t expires;
2096 unsigned long timeout;
2097
2098 ASSERT_RTNL();
2099
2100 if (plen > 128)
2101 return -EINVAL;
2102
2103 /* check the lifetime */
2104 if (!valid_lft || prefered_lft > valid_lft)
2105 return -EINVAL;
2106
2107 dev = __dev_get_by_index(net, ifindex);
2108 if (!dev)
2109 return -ENODEV;
2110
2111 if ((idev = addrconf_add_dev(dev)) == NULL)
2112 return -ENOBUFS;
2113
2114 scope = ipv6_addr_scope(pfx);
2115
2116 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2117 if (addrconf_finite_timeout(timeout)) {
2118 expires = jiffies_to_clock_t(timeout * HZ);
2119 valid_lft = timeout;
2120 flags = RTF_EXPIRES;
2121 } else {
2122 expires = 0;
2123 flags = 0;
2124 ifa_flags |= IFA_F_PERMANENT;
2125 }
2126
2127 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2128 if (addrconf_finite_timeout(timeout)) {
2129 if (timeout == 0)
2130 ifa_flags |= IFA_F_DEPRECATED;
2131 prefered_lft = timeout;
2132 }
2133
2134 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2135
2136 if (!IS_ERR(ifp)) {
2137 spin_lock_bh(&ifp->lock);
2138 ifp->valid_lft = valid_lft;
2139 ifp->prefered_lft = prefered_lft;
2140 ifp->tstamp = jiffies;
2141 spin_unlock_bh(&ifp->lock);
2142
2143 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2144 expires, flags);
2145 /*
2146 * Note that section 3.1 of RFC 4429 indicates
2147 * that the Optimistic flag should not be set for
2148 * manually configured addresses
2149 */
2150 addrconf_dad_start(ifp, 0);
2151 in6_ifa_put(ifp);
2152 addrconf_verify(0);
2153 return 0;
2154 }
2155
2156 return PTR_ERR(ifp);
2157 }
2158
2159 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2160 unsigned int plen)
2161 {
2162 struct inet6_ifaddr *ifp;
2163 struct inet6_dev *idev;
2164 struct net_device *dev;
2165
2166 if (plen > 128)
2167 return -EINVAL;
2168
2169 dev = __dev_get_by_index(net, ifindex);
2170 if (!dev)
2171 return -ENODEV;
2172
2173 if ((idev = __in6_dev_get(dev)) == NULL)
2174 return -ENXIO;
2175
2176 read_lock_bh(&idev->lock);
2177 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2178 if (ifp->prefix_len == plen &&
2179 ipv6_addr_equal(pfx, &ifp->addr)) {
2180 in6_ifa_hold(ifp);
2181 read_unlock_bh(&idev->lock);
2182
2183 ipv6_del_addr(ifp);
2184
2185 /* If the last address is deleted administratively,
2186 disable IPv6 on this interface.
2187 */
2188 if (idev->addr_list == NULL)
2189 addrconf_ifdown(idev->dev, 1);
2190 return 0;
2191 }
2192 }
2193 read_unlock_bh(&idev->lock);
2194 return -EADDRNOTAVAIL;
2195 }
2196
2197
2198 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2199 {
2200 struct in6_ifreq ireq;
2201 int err;
2202
2203 if (!capable(CAP_NET_ADMIN))
2204 return -EPERM;
2205
2206 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2207 return -EFAULT;
2208
2209 rtnl_lock();
2210 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2211 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2212 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2213 rtnl_unlock();
2214 return err;
2215 }
2216
2217 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2218 {
2219 struct in6_ifreq ireq;
2220 int err;
2221
2222 if (!capable(CAP_NET_ADMIN))
2223 return -EPERM;
2224
2225 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2226 return -EFAULT;
2227
2228 rtnl_lock();
2229 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2230 ireq.ifr6_prefixlen);
2231 rtnl_unlock();
2232 return err;
2233 }
2234
2235 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2236 int plen, int scope)
2237 {
2238 struct inet6_ifaddr *ifp;
2239
2240 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2241 if (!IS_ERR(ifp)) {
2242 spin_lock_bh(&ifp->lock);
2243 ifp->flags &= ~IFA_F_TENTATIVE;
2244 spin_unlock_bh(&ifp->lock);
2245 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2246 in6_ifa_put(ifp);
2247 }
2248 }
2249
2250 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2251 static void sit_add_v4_addrs(struct inet6_dev *idev)
2252 {
2253 struct in6_addr addr;
2254 struct net_device *dev;
2255 struct net *net = dev_net(idev->dev);
2256 int scope;
2257
2258 ASSERT_RTNL();
2259
2260 memset(&addr, 0, sizeof(struct in6_addr));
2261 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2262
2263 if (idev->dev->flags&IFF_POINTOPOINT) {
2264 addr.s6_addr32[0] = htonl(0xfe800000);
2265 scope = IFA_LINK;
2266 } else {
2267 scope = IPV6_ADDR_COMPATv4;
2268 }
2269
2270 if (addr.s6_addr32[3]) {
2271 add_addr(idev, &addr, 128, scope);
2272 return;
2273 }
2274
2275 for_each_netdev(net, dev) {
2276 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2277 if (in_dev && (dev->flags & IFF_UP)) {
2278 struct in_ifaddr * ifa;
2279
2280 int flag = scope;
2281
2282 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2283 int plen;
2284
2285 addr.s6_addr32[3] = ifa->ifa_local;
2286
2287 if (ifa->ifa_scope == RT_SCOPE_LINK)
2288 continue;
2289 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2290 if (idev->dev->flags&IFF_POINTOPOINT)
2291 continue;
2292 flag |= IFA_HOST;
2293 }
2294 if (idev->dev->flags&IFF_POINTOPOINT)
2295 plen = 64;
2296 else
2297 plen = 96;
2298
2299 add_addr(idev, &addr, plen, flag);
2300 }
2301 }
2302 }
2303 }
2304 #endif
2305
2306 static void init_loopback(struct net_device *dev)
2307 {
2308 struct inet6_dev *idev;
2309
2310 /* ::1 */
2311
2312 ASSERT_RTNL();
2313
2314 if ((idev = ipv6_find_idev(dev)) == NULL) {
2315 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2316 return;
2317 }
2318
2319 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2320 }
2321
2322 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2323 {
2324 struct inet6_ifaddr * ifp;
2325 u32 addr_flags = IFA_F_PERMANENT;
2326
2327 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2328 if (idev->cnf.optimistic_dad &&
2329 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2330 addr_flags |= IFA_F_OPTIMISTIC;
2331 #endif
2332
2333
2334 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2335 if (!IS_ERR(ifp)) {
2336 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2337 addrconf_dad_start(ifp, 0);
2338 in6_ifa_put(ifp);
2339 }
2340 }
2341
2342 static void addrconf_dev_config(struct net_device *dev)
2343 {
2344 struct in6_addr addr;
2345 struct inet6_dev * idev;
2346
2347 ASSERT_RTNL();
2348
2349 if ((dev->type != ARPHRD_ETHER) &&
2350 (dev->type != ARPHRD_FDDI) &&
2351 (dev->type != ARPHRD_IEEE802_TR) &&
2352 (dev->type != ARPHRD_ARCNET) &&
2353 (dev->type != ARPHRD_INFINIBAND)) {
2354 /* Alas, we support only Ethernet autoconfiguration. */
2355 return;
2356 }
2357
2358 idev = addrconf_add_dev(dev);
2359 if (idev == NULL)
2360 return;
2361
2362 memset(&addr, 0, sizeof(struct in6_addr));
2363 addr.s6_addr32[0] = htonl(0xFE800000);
2364
2365 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2366 addrconf_add_linklocal(idev, &addr);
2367 }
2368
2369 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2370 static void addrconf_sit_config(struct net_device *dev)
2371 {
2372 struct inet6_dev *idev;
2373
2374 ASSERT_RTNL();
2375
2376 /*
2377 * Configure the tunnel with one of our IPv4
2378 * addresses... we should configure all of
2379 * our v4 addrs in the tunnel
2380 */
2381
2382 if ((idev = ipv6_find_idev(dev)) == NULL) {
2383 printk(KERN_DEBUG "init sit: add_dev failed\n");
2384 return;
2385 }
2386
2387 if (dev->priv_flags & IFF_ISATAP) {
2388 struct in6_addr addr;
2389
2390 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2391 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2392 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2393 addrconf_add_linklocal(idev, &addr);
2394 return;
2395 }
2396
2397 sit_add_v4_addrs(idev);
2398
2399 if (dev->flags&IFF_POINTOPOINT) {
2400 addrconf_add_mroute(dev);
2401 addrconf_add_lroute(dev);
2402 } else
2403 sit_route_add(dev);
2404 }
2405 #endif
2406
2407 static inline int
2408 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2409 {
2410 struct in6_addr lladdr;
2411
2412 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2413 addrconf_add_linklocal(idev, &lladdr);
2414 return 0;
2415 }
2416 return -1;
2417 }
2418
2419 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2420 {
2421 struct net_device *link_dev;
2422 struct net *net = dev_net(idev->dev);
2423
2424 /* first try to inherit the link-local address from the link device */
2425 if (idev->dev->iflink &&
2426 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2427 if (!ipv6_inherit_linklocal(idev, link_dev))
2428 return;
2429 }
2430 /* then try to inherit it from any device */
2431 for_each_netdev(net, link_dev) {
2432 if (!ipv6_inherit_linklocal(idev, link_dev))
2433 return;
2434 }
2435 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2436 }
2437
2438 /*
2439 * Autoconfigure tunnel with a link-local address so routing protocols,
2440 * DHCPv6, MLD etc. can be run over the virtual link
2441 */
2442
2443 static void addrconf_ip6_tnl_config(struct net_device *dev)
2444 {
2445 struct inet6_dev *idev;
2446
2447 ASSERT_RTNL();
2448
2449 if ((idev = addrconf_add_dev(dev)) == NULL) {
2450 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2451 return;
2452 }
2453 ip6_tnl_add_linklocal(idev);
2454 }
2455
2456 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2457 void * data)
2458 {
2459 struct net_device *dev = (struct net_device *) data;
2460 struct inet6_dev *idev = __in6_dev_get(dev);
2461 int run_pending = 0;
2462 int err;
2463
2464 switch(event) {
2465 case NETDEV_REGISTER:
2466 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2467 idev = ipv6_add_dev(dev);
2468 if (!idev)
2469 return notifier_from_errno(-ENOMEM);
2470 }
2471 break;
2472 case NETDEV_UP:
2473 case NETDEV_CHANGE:
2474 if (dev->flags & IFF_SLAVE)
2475 break;
2476
2477 if (event == NETDEV_UP) {
2478 if (!addrconf_qdisc_ok(dev)) {
2479 /* device is not ready yet. */
2480 printk(KERN_INFO
2481 "ADDRCONF(NETDEV_UP): %s: "
2482 "link is not ready\n",
2483 dev->name);
2484 break;
2485 }
2486
2487 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2488 idev = ipv6_add_dev(dev);
2489
2490 if (idev) {
2491 idev->if_flags |= IF_READY;
2492 run_pending = 1;
2493 }
2494 } else {
2495 if (!addrconf_qdisc_ok(dev)) {
2496 /* device is still not ready. */
2497 break;
2498 }
2499
2500 if (idev) {
2501 if (idev->if_flags & IF_READY) {
2502 /* device is already configured. */
2503 break;
2504 }
2505 idev->if_flags |= IF_READY;
2506 }
2507
2508 printk(KERN_INFO
2509 "ADDRCONF(NETDEV_CHANGE): %s: "
2510 "link becomes ready\n",
2511 dev->name);
2512
2513 run_pending = 1;
2514 }
2515
2516 switch(dev->type) {
2517 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2518 case ARPHRD_SIT:
2519 addrconf_sit_config(dev);
2520 break;
2521 #endif
2522 case ARPHRD_TUNNEL6:
2523 addrconf_ip6_tnl_config(dev);
2524 break;
2525 case ARPHRD_LOOPBACK:
2526 init_loopback(dev);
2527 break;
2528
2529 default:
2530 addrconf_dev_config(dev);
2531 break;
2532 }
2533 if (idev) {
2534 if (run_pending)
2535 addrconf_dad_run(idev);
2536
2537 /* If the MTU changed during the interface down, when the
2538 interface up, the changed MTU must be reflected in the
2539 idev as well as routers.
2540 */
2541 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2542 rt6_mtu_change(dev, dev->mtu);
2543 idev->cnf.mtu6 = dev->mtu;
2544 }
2545 idev->tstamp = jiffies;
2546 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2547 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2548 stop IPv6 on this interface.
2549 */
2550 if (dev->mtu < IPV6_MIN_MTU)
2551 addrconf_ifdown(dev, event != NETDEV_DOWN);
2552 }
2553 break;
2554
2555 case NETDEV_CHANGEMTU:
2556 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2557 rt6_mtu_change(dev, dev->mtu);
2558 idev->cnf.mtu6 = dev->mtu;
2559 break;
2560 }
2561
2562 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2563 idev = ipv6_add_dev(dev);
2564 if (idev)
2565 break;
2566 }
2567
2568 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2569
2570 case NETDEV_DOWN:
2571 case NETDEV_UNREGISTER:
2572 /*
2573 * Remove all addresses from this interface.
2574 */
2575 addrconf_ifdown(dev, event != NETDEV_DOWN);
2576 break;
2577
2578 case NETDEV_CHANGENAME:
2579 if (idev) {
2580 snmp6_unregister_dev(idev);
2581 addrconf_sysctl_unregister(idev);
2582 addrconf_sysctl_register(idev);
2583 err = snmp6_register_dev(idev);
2584 if (err)
2585 return notifier_from_errno(err);
2586 }
2587 break;
2588 case NETDEV_BONDING_OLDTYPE:
2589 case NETDEV_BONDING_NEWTYPE:
2590 addrconf_bonding_change(dev, event);
2591 break;
2592 }
2593
2594 return NOTIFY_OK;
2595 }
2596
2597 /*
2598 * addrconf module should be notified of a device going up
2599 */
2600 static struct notifier_block ipv6_dev_notf = {
2601 .notifier_call = addrconf_notify,
2602 .priority = 0
2603 };
2604
2605 static void addrconf_bonding_change(struct net_device *dev, unsigned long event)
2606 {
2607 struct inet6_dev *idev;
2608 ASSERT_RTNL();
2609
2610 idev = __in6_dev_get(dev);
2611
2612 if (event == NETDEV_BONDING_NEWTYPE)
2613 ipv6_mc_remap(idev);
2614 else if (event == NETDEV_BONDING_OLDTYPE)
2615 ipv6_mc_unmap(idev);
2616 }
2617
2618 static int addrconf_ifdown(struct net_device *dev, int how)
2619 {
2620 struct inet6_dev *idev;
2621 struct inet6_ifaddr *ifa, *keep_list, **bifa;
2622 struct net *net = dev_net(dev);
2623 int i;
2624
2625 ASSERT_RTNL();
2626
2627 rt6_ifdown(net, dev);
2628 neigh_ifdown(&nd_tbl, dev);
2629
2630 idev = __in6_dev_get(dev);
2631 if (idev == NULL)
2632 return -ENODEV;
2633
2634 /* Step 1: remove reference to ipv6 device from parent device.
2635 Do not dev_put!
2636 */
2637 if (how) {
2638 idev->dead = 1;
2639
2640 /* protected by rtnl_lock */
2641 rcu_assign_pointer(dev->ip6_ptr, NULL);
2642
2643 /* Step 1.5: remove snmp6 entry */
2644 snmp6_unregister_dev(idev);
2645
2646 }
2647
2648 /* Step 2: clear hash table */
2649 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2650 bifa = &inet6_addr_lst[i];
2651
2652 write_lock_bh(&addrconf_hash_lock);
2653 while ((ifa = *bifa) != NULL) {
2654 if (ifa->idev == idev &&
2655 (how || !(ifa->flags&IFA_F_PERMANENT) ||
2656 ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
2657 *bifa = ifa->lst_next;
2658 ifa->lst_next = NULL;
2659 __in6_ifa_put(ifa);
2660 continue;
2661 }
2662 bifa = &ifa->lst_next;
2663 }
2664 write_unlock_bh(&addrconf_hash_lock);
2665 }
2666
2667 write_lock_bh(&idev->lock);
2668
2669 /* Step 3: clear flags for stateless addrconf */
2670 if (!how)
2671 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2672
2673 /* Step 4: clear address list */
2674 #ifdef CONFIG_IPV6_PRIVACY
2675 if (how && del_timer(&idev->regen_timer))
2676 in6_dev_put(idev);
2677
2678 /* clear tempaddr list */
2679 while ((ifa = idev->tempaddr_list) != NULL) {
2680 idev->tempaddr_list = ifa->tmp_next;
2681 ifa->tmp_next = NULL;
2682 ifa->dead = 1;
2683 write_unlock_bh(&idev->lock);
2684 spin_lock_bh(&ifa->lock);
2685
2686 if (ifa->ifpub) {
2687 in6_ifa_put(ifa->ifpub);
2688 ifa->ifpub = NULL;
2689 }
2690 spin_unlock_bh(&ifa->lock);
2691 in6_ifa_put(ifa);
2692 write_lock_bh(&idev->lock);
2693 }
2694 #endif
2695 keep_list = NULL;
2696 bifa = &keep_list;
2697 while ((ifa = idev->addr_list) != NULL) {
2698 idev->addr_list = ifa->if_next;
2699 ifa->if_next = NULL;
2700
2701 addrconf_del_timer(ifa);
2702
2703 /* If just doing link down, and address is permanent
2704 and not link-local, then retain it. */
2705 if (how == 0 &&
2706 (ifa->flags&IFA_F_PERMANENT) &&
2707 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
2708
2709 /* Move to holding list */
2710 *bifa = ifa;
2711 bifa = &ifa->if_next;
2712
2713 /* If not doing DAD on this address, just keep it. */
2714 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2715 idev->cnf.accept_dad <= 0 ||
2716 (ifa->flags & IFA_F_NODAD))
2717 continue;
2718
2719 /* If it was tentative already, no need to notify */
2720 if (ifa->flags & IFA_F_TENTATIVE)
2721 continue;
2722
2723 /* Flag it for later restoration when link comes up */
2724 ifa->flags |= IFA_F_TENTATIVE;
2725 in6_ifa_hold(ifa);
2726 } else {
2727 ifa->dead = 1;
2728 }
2729 write_unlock_bh(&idev->lock);
2730
2731 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2732 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2733 in6_ifa_put(ifa);
2734
2735 write_lock_bh(&idev->lock);
2736 }
2737
2738 idev->addr_list = keep_list;
2739
2740 write_unlock_bh(&idev->lock);
2741
2742 /* Step 5: Discard multicast list */
2743
2744 if (how)
2745 ipv6_mc_destroy_dev(idev);
2746 else
2747 ipv6_mc_down(idev);
2748
2749 idev->tstamp = jiffies;
2750
2751 /* Shot the device (if unregistered) */
2752
2753 if (how) {
2754 addrconf_sysctl_unregister(idev);
2755 neigh_parms_release(&nd_tbl, idev->nd_parms);
2756 neigh_ifdown(&nd_tbl, dev);
2757 in6_dev_put(idev);
2758 }
2759 return 0;
2760 }
2761
2762 static void addrconf_rs_timer(unsigned long data)
2763 {
2764 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2765 struct inet6_dev *idev = ifp->idev;
2766
2767 read_lock(&idev->lock);
2768 if (idev->dead || !(idev->if_flags & IF_READY))
2769 goto out;
2770
2771 if (idev->cnf.forwarding)
2772 goto out;
2773
2774 /* Announcement received after solicitation was sent */
2775 if (idev->if_flags & IF_RA_RCVD)
2776 goto out;
2777
2778 spin_lock(&ifp->lock);
2779 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2780 /* The wait after the last probe can be shorter */
2781 addrconf_mod_timer(ifp, AC_RS,
2782 (ifp->probes == idev->cnf.rtr_solicits) ?
2783 idev->cnf.rtr_solicit_delay :
2784 idev->cnf.rtr_solicit_interval);
2785 spin_unlock(&ifp->lock);
2786
2787 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2788 } else {
2789 spin_unlock(&ifp->lock);
2790 /*
2791 * Note: we do not support deprecated "all on-link"
2792 * assumption any longer.
2793 */
2794 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2795 idev->dev->name);
2796 }
2797
2798 out:
2799 read_unlock(&idev->lock);
2800 in6_ifa_put(ifp);
2801 }
2802
2803 /*
2804 * Duplicate Address Detection
2805 */
2806 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2807 {
2808 unsigned long rand_num;
2809 struct inet6_dev *idev = ifp->idev;
2810
2811 if (ifp->flags & IFA_F_OPTIMISTIC)
2812 rand_num = 0;
2813 else
2814 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2815
2816 ifp->probes = idev->cnf.dad_transmits;
2817 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2818 }
2819
2820 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2821 {
2822 struct inet6_dev *idev = ifp->idev;
2823 struct net_device *dev = idev->dev;
2824
2825 addrconf_join_solict(dev, &ifp->addr);
2826
2827 net_srandom(ifp->addr.s6_addr32[3]);
2828
2829 read_lock_bh(&idev->lock);
2830 if (ifp->dead)
2831 goto out;
2832
2833 spin_lock(&ifp->lock);
2834 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2835 idev->cnf.accept_dad < 1 ||
2836 !(ifp->flags&IFA_F_TENTATIVE) ||
2837 ifp->flags & IFA_F_NODAD) {
2838 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2839 spin_unlock(&ifp->lock);
2840 read_unlock_bh(&idev->lock);
2841
2842 addrconf_dad_completed(ifp);
2843 return;
2844 }
2845
2846 if (!(idev->if_flags & IF_READY)) {
2847 spin_unlock(&ifp->lock);
2848 read_unlock_bh(&idev->lock);
2849 /*
2850 * If the device is not ready:
2851 * - keep it tentative if it is a permanent address.
2852 * - otherwise, kill it.
2853 */
2854 in6_ifa_hold(ifp);
2855 addrconf_dad_stop(ifp, 0);
2856 return;
2857 }
2858
2859 /*
2860 * Optimistic nodes can start receiving
2861 * Frames right away
2862 */
2863 if(ifp->flags & IFA_F_OPTIMISTIC)
2864 ip6_ins_rt(ifp->rt);
2865
2866 addrconf_dad_kick(ifp);
2867 spin_unlock(&ifp->lock);
2868 out:
2869 read_unlock_bh(&idev->lock);
2870 }
2871
2872 static void addrconf_dad_timer(unsigned long data)
2873 {
2874 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2875 struct inet6_dev *idev = ifp->idev;
2876 struct in6_addr mcaddr;
2877
2878 read_lock(&idev->lock);
2879 if (idev->dead || !(idev->if_flags & IF_READY)) {
2880 read_unlock(&idev->lock);
2881 goto out;
2882 }
2883
2884 spin_lock(&ifp->lock);
2885 if (ifp->probes == 0) {
2886 /*
2887 * DAD was successful
2888 */
2889
2890 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2891 spin_unlock(&ifp->lock);
2892 read_unlock(&idev->lock);
2893
2894 addrconf_dad_completed(ifp);
2895
2896 goto out;
2897 }
2898
2899 ifp->probes--;
2900 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2901 spin_unlock(&ifp->lock);
2902 read_unlock(&idev->lock);
2903
2904 /* send a neighbour solicitation for our addr */
2905 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2906 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2907 out:
2908 in6_ifa_put(ifp);
2909 }
2910
2911 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2912 {
2913 struct net_device * dev = ifp->idev->dev;
2914
2915 /*
2916 * Configure the address for reception. Now it is valid.
2917 */
2918
2919 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2920
2921 /* If added prefix is link local and forwarding is off,
2922 start sending router solicitations.
2923 */
2924
2925 if (ifp->idev->cnf.forwarding == 0 &&
2926 ifp->idev->cnf.rtr_solicits > 0 &&
2927 (dev->flags&IFF_LOOPBACK) == 0 &&
2928 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2929 /*
2930 * If a host as already performed a random delay
2931 * [...] as part of DAD [...] there is no need
2932 * to delay again before sending the first RS
2933 */
2934 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2935
2936 spin_lock_bh(&ifp->lock);
2937 ifp->probes = 1;
2938 ifp->idev->if_flags |= IF_RS_SENT;
2939 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2940 spin_unlock_bh(&ifp->lock);
2941 }
2942 }
2943
2944 static void addrconf_dad_run(struct inet6_dev *idev) {
2945 struct inet6_ifaddr *ifp;
2946
2947 read_lock_bh(&idev->lock);
2948 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2949 spin_lock(&ifp->lock);
2950 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2951 spin_unlock(&ifp->lock);
2952 continue;
2953 }
2954 spin_unlock(&ifp->lock);
2955 addrconf_dad_kick(ifp);
2956 }
2957 read_unlock_bh(&idev->lock);
2958 }
2959
2960 #ifdef CONFIG_PROC_FS
2961 struct if6_iter_state {
2962 struct seq_net_private p;
2963 int bucket;
2964 };
2965
2966 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2967 {
2968 struct inet6_ifaddr *ifa = NULL;
2969 struct if6_iter_state *state = seq->private;
2970 struct net *net = seq_file_net(seq);
2971
2972 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2973 ifa = inet6_addr_lst[state->bucket];
2974
2975 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2976 ifa = ifa->lst_next;
2977 if (ifa)
2978 break;
2979 }
2980 return ifa;
2981 }
2982
2983 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2984 {
2985 struct if6_iter_state *state = seq->private;
2986 struct net *net = seq_file_net(seq);
2987
2988 ifa = ifa->lst_next;
2989 try_again:
2990 if (ifa) {
2991 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2992 ifa = ifa->lst_next;
2993 goto try_again;
2994 }
2995 }
2996
2997 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2998 ifa = inet6_addr_lst[state->bucket];
2999 goto try_again;
3000 }
3001
3002 return ifa;
3003 }
3004
3005 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3006 {
3007 struct inet6_ifaddr *ifa = if6_get_first(seq);
3008
3009 if (ifa)
3010 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3011 --pos;
3012 return pos ? NULL : ifa;
3013 }
3014
3015 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3016 __acquires(addrconf_hash_lock)
3017 {
3018 read_lock_bh(&addrconf_hash_lock);
3019 return if6_get_idx(seq, *pos);
3020 }
3021
3022 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3023 {
3024 struct inet6_ifaddr *ifa;
3025
3026 ifa = if6_get_next(seq, v);
3027 ++*pos;
3028 return ifa;
3029 }
3030
3031 static void if6_seq_stop(struct seq_file *seq, void *v)
3032 __releases(addrconf_hash_lock)
3033 {
3034 read_unlock_bh(&addrconf_hash_lock);
3035 }
3036
3037 static int if6_seq_show(struct seq_file *seq, void *v)
3038 {
3039 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3040 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3041 &ifp->addr,
3042 ifp->idev->dev->ifindex,
3043 ifp->prefix_len,
3044 ifp->scope,
3045 ifp->flags,
3046 ifp->idev->dev->name);
3047 return 0;
3048 }
3049
3050 static const struct seq_operations if6_seq_ops = {
3051 .start = if6_seq_start,
3052 .next = if6_seq_next,
3053 .show = if6_seq_show,
3054 .stop = if6_seq_stop,
3055 };
3056
3057 static int if6_seq_open(struct inode *inode, struct file *file)
3058 {
3059 return seq_open_net(inode, file, &if6_seq_ops,
3060 sizeof(struct if6_iter_state));
3061 }
3062
3063 static const struct file_operations if6_fops = {
3064 .owner = THIS_MODULE,
3065 .open = if6_seq_open,
3066 .read = seq_read,
3067 .llseek = seq_lseek,
3068 .release = seq_release_net,
3069 };
3070
3071 static int __net_init if6_proc_net_init(struct net *net)
3072 {
3073 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3074 return -ENOMEM;
3075 return 0;
3076 }
3077
3078 static void __net_exit if6_proc_net_exit(struct net *net)
3079 {
3080 proc_net_remove(net, "if_inet6");
3081 }
3082
3083 static struct pernet_operations if6_proc_net_ops = {
3084 .init = if6_proc_net_init,
3085 .exit = if6_proc_net_exit,
3086 };
3087
3088 int __init if6_proc_init(void)
3089 {
3090 return register_pernet_subsys(&if6_proc_net_ops);
3091 }
3092
3093 void if6_proc_exit(void)
3094 {
3095 unregister_pernet_subsys(&if6_proc_net_ops);
3096 }
3097 #endif /* CONFIG_PROC_FS */
3098
3099 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3100 /* Check if address is a home address configured on any interface. */
3101 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3102 {
3103 int ret = 0;
3104 struct inet6_ifaddr * ifp;
3105 u8 hash = ipv6_addr_hash(addr);
3106 read_lock_bh(&addrconf_hash_lock);
3107 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3108 if (!net_eq(dev_net(ifp->idev->dev), net))
3109 continue;
3110 if (ipv6_addr_equal(&ifp->addr, addr) &&
3111 (ifp->flags & IFA_F_HOMEADDRESS)) {
3112 ret = 1;
3113 break;
3114 }
3115 }
3116 read_unlock_bh(&addrconf_hash_lock);
3117 return ret;
3118 }
3119 #endif
3120
3121 /*
3122 * Periodic address status verification
3123 */
3124
3125 static void addrconf_verify(unsigned long foo)
3126 {
3127 struct inet6_ifaddr *ifp;
3128 unsigned long now, next;
3129 int i;
3130
3131 spin_lock_bh(&addrconf_verify_lock);
3132 now = jiffies;
3133 next = now + ADDR_CHECK_FREQUENCY;
3134
3135 del_timer(&addr_chk_timer);
3136
3137 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3138
3139 restart:
3140 read_lock(&addrconf_hash_lock);
3141 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3142 unsigned long age;
3143 #ifdef CONFIG_IPV6_PRIVACY
3144 unsigned long regen_advance;
3145 #endif
3146
3147 if (ifp->flags & IFA_F_PERMANENT)
3148 continue;
3149
3150 spin_lock(&ifp->lock);
3151 age = (now - ifp->tstamp) / HZ;
3152
3153 #ifdef CONFIG_IPV6_PRIVACY
3154 regen_advance = ifp->idev->cnf.regen_max_retry *
3155 ifp->idev->cnf.dad_transmits *
3156 ifp->idev->nd_parms->retrans_time / HZ;
3157 #endif
3158
3159 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3160 age >= ifp->valid_lft) {
3161 spin_unlock(&ifp->lock);
3162 in6_ifa_hold(ifp);
3163 read_unlock(&addrconf_hash_lock);
3164 ipv6_del_addr(ifp);
3165 goto restart;
3166 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3167 spin_unlock(&ifp->lock);
3168 continue;
3169 } else if (age >= ifp->prefered_lft) {
3170 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3171 int deprecate = 0;
3172
3173 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3174 deprecate = 1;
3175 ifp->flags |= IFA_F_DEPRECATED;
3176 }
3177
3178 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3179 next = ifp->tstamp + ifp->valid_lft * HZ;
3180
3181 spin_unlock(&ifp->lock);
3182
3183 if (deprecate) {
3184 in6_ifa_hold(ifp);
3185 read_unlock(&addrconf_hash_lock);
3186
3187 ipv6_ifa_notify(0, ifp);
3188 in6_ifa_put(ifp);
3189 goto restart;
3190 }
3191 #ifdef CONFIG_IPV6_PRIVACY
3192 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3193 !(ifp->flags&IFA_F_TENTATIVE)) {
3194 if (age >= ifp->prefered_lft - regen_advance) {
3195 struct inet6_ifaddr *ifpub = ifp->ifpub;
3196 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3197 next = ifp->tstamp + ifp->prefered_lft * HZ;
3198 if (!ifp->regen_count && ifpub) {
3199 ifp->regen_count++;
3200 in6_ifa_hold(ifp);
3201 in6_ifa_hold(ifpub);
3202 spin_unlock(&ifp->lock);
3203 read_unlock(&addrconf_hash_lock);
3204 spin_lock(&ifpub->lock);
3205 ifpub->regen_count = 0;
3206 spin_unlock(&ifpub->lock);
3207 ipv6_create_tempaddr(ifpub, ifp);
3208 in6_ifa_put(ifpub);
3209 in6_ifa_put(ifp);
3210 goto restart;
3211 }
3212 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3213 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3214 spin_unlock(&ifp->lock);
3215 #endif
3216 } else {
3217 /* ifp->prefered_lft <= ifp->valid_lft */
3218 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3219 next = ifp->tstamp + ifp->prefered_lft * HZ;
3220 spin_unlock(&ifp->lock);
3221 }
3222 }
3223 read_unlock(&addrconf_hash_lock);
3224 }
3225
3226 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3227 add_timer(&addr_chk_timer);
3228 spin_unlock_bh(&addrconf_verify_lock);
3229 }
3230
3231 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3232 {
3233 struct in6_addr *pfx = NULL;
3234
3235 if (addr)
3236 pfx = nla_data(addr);
3237
3238 if (local) {
3239 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3240 pfx = NULL;
3241 else
3242 pfx = nla_data(local);
3243 }
3244
3245 return pfx;
3246 }
3247
3248 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3249 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3250 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3251 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3252 };
3253
3254 static int
3255 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3256 {
3257 struct net *net = sock_net(skb->sk);
3258 struct ifaddrmsg *ifm;
3259 struct nlattr *tb[IFA_MAX+1];
3260 struct in6_addr *pfx;
3261 int err;
3262
3263 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3264 if (err < 0)
3265 return err;
3266
3267 ifm = nlmsg_data(nlh);
3268 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3269 if (pfx == NULL)
3270 return -EINVAL;
3271
3272 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3273 }
3274
3275 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3276 u32 prefered_lft, u32 valid_lft)
3277 {
3278 u32 flags;
3279 clock_t expires;
3280 unsigned long timeout;
3281
3282 if (!valid_lft || (prefered_lft > valid_lft))
3283 return -EINVAL;
3284
3285 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3286 if (addrconf_finite_timeout(timeout)) {
3287 expires = jiffies_to_clock_t(timeout * HZ);
3288 valid_lft = timeout;
3289 flags = RTF_EXPIRES;
3290 } else {
3291 expires = 0;
3292 flags = 0;
3293 ifa_flags |= IFA_F_PERMANENT;
3294 }
3295
3296 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3297 if (addrconf_finite_timeout(timeout)) {
3298 if (timeout == 0)
3299 ifa_flags |= IFA_F_DEPRECATED;
3300 prefered_lft = timeout;
3301 }
3302
3303 spin_lock_bh(&ifp->lock);
3304 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3305 ifp->tstamp = jiffies;
3306 ifp->valid_lft = valid_lft;
3307 ifp->prefered_lft = prefered_lft;
3308
3309 spin_unlock_bh(&ifp->lock);
3310 if (!(ifp->flags&IFA_F_TENTATIVE))
3311 ipv6_ifa_notify(0, ifp);
3312
3313 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3314 expires, flags);
3315 addrconf_verify(0);
3316
3317 return 0;
3318 }
3319
3320 static int
3321 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3322 {
3323 struct net *net = sock_net(skb->sk);
3324 struct ifaddrmsg *ifm;
3325 struct nlattr *tb[IFA_MAX+1];
3326 struct in6_addr *pfx;
3327 struct inet6_ifaddr *ifa;
3328 struct net_device *dev;
3329 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3330 u8 ifa_flags;
3331 int err;
3332
3333 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3334 if (err < 0)
3335 return err;
3336
3337 ifm = nlmsg_data(nlh);
3338 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3339 if (pfx == NULL)
3340 return -EINVAL;
3341
3342 if (tb[IFA_CACHEINFO]) {
3343 struct ifa_cacheinfo *ci;
3344
3345 ci = nla_data(tb[IFA_CACHEINFO]);
3346 valid_lft = ci->ifa_valid;
3347 preferred_lft = ci->ifa_prefered;
3348 } else {
3349 preferred_lft = INFINITY_LIFE_TIME;
3350 valid_lft = INFINITY_LIFE_TIME;
3351 }
3352
3353 dev = __dev_get_by_index(net, ifm->ifa_index);
3354 if (dev == NULL)
3355 return -ENODEV;
3356
3357 /* We ignore other flags so far. */
3358 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3359
3360 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3361 if (ifa == NULL) {
3362 /*
3363 * It would be best to check for !NLM_F_CREATE here but
3364 * userspace alreay relies on not having to provide this.
3365 */
3366 return inet6_addr_add(net, ifm->ifa_index, pfx,
3367 ifm->ifa_prefixlen, ifa_flags,
3368 preferred_lft, valid_lft);
3369 }
3370
3371 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3372 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3373 err = -EEXIST;
3374 else
3375 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3376
3377 in6_ifa_put(ifa);
3378
3379 return err;
3380 }
3381
3382 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3383 u8 scope, int ifindex)
3384 {
3385 struct ifaddrmsg *ifm;
3386
3387 ifm = nlmsg_data(nlh);
3388 ifm->ifa_family = AF_INET6;
3389 ifm->ifa_prefixlen = prefixlen;
3390 ifm->ifa_flags = flags;
3391 ifm->ifa_scope = scope;
3392 ifm->ifa_index = ifindex;
3393 }
3394
3395 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3396 unsigned long tstamp, u32 preferred, u32 valid)
3397 {
3398 struct ifa_cacheinfo ci;
3399
3400 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3401 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3402 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3403 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3404 ci.ifa_prefered = preferred;
3405 ci.ifa_valid = valid;
3406
3407 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3408 }
3409
3410 static inline int rt_scope(int ifa_scope)
3411 {
3412 if (ifa_scope & IFA_HOST)
3413 return RT_SCOPE_HOST;
3414 else if (ifa_scope & IFA_LINK)
3415 return RT_SCOPE_LINK;
3416 else if (ifa_scope & IFA_SITE)
3417 return RT_SCOPE_SITE;
3418 else
3419 return RT_SCOPE_UNIVERSE;
3420 }
3421
3422 static inline int inet6_ifaddr_msgsize(void)
3423 {
3424 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3425 + nla_total_size(16) /* IFA_ADDRESS */
3426 + nla_total_size(sizeof(struct ifa_cacheinfo));
3427 }
3428
3429 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3430 u32 pid, u32 seq, int event, unsigned int flags)
3431 {
3432 struct nlmsghdr *nlh;
3433 u32 preferred, valid;
3434
3435 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3436 if (nlh == NULL)
3437 return -EMSGSIZE;
3438
3439 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3440 ifa->idev->dev->ifindex);
3441
3442 if (!(ifa->flags&IFA_F_PERMANENT)) {
3443 preferred = ifa->prefered_lft;
3444 valid = ifa->valid_lft;
3445 if (preferred != INFINITY_LIFE_TIME) {
3446 long tval = (jiffies - ifa->tstamp)/HZ;
3447 if (preferred > tval)
3448 preferred -= tval;
3449 else
3450 preferred = 0;
3451 if (valid != INFINITY_LIFE_TIME)
3452 valid -= tval;
3453 }
3454 } else {
3455 preferred = INFINITY_LIFE_TIME;
3456 valid = INFINITY_LIFE_TIME;
3457 }
3458
3459 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3460 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3461 nlmsg_cancel(skb, nlh);
3462 return -EMSGSIZE;
3463 }
3464
3465 return nlmsg_end(skb, nlh);
3466 }
3467
3468 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3469 u32 pid, u32 seq, int event, u16 flags)
3470 {
3471 struct nlmsghdr *nlh;
3472 u8 scope = RT_SCOPE_UNIVERSE;
3473 int ifindex = ifmca->idev->dev->ifindex;
3474
3475 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3476 scope = RT_SCOPE_SITE;
3477
3478 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3479 if (nlh == NULL)
3480 return -EMSGSIZE;
3481
3482 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3483 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3484 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3485 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3486 nlmsg_cancel(skb, nlh);
3487 return -EMSGSIZE;
3488 }
3489
3490 return nlmsg_end(skb, nlh);
3491 }
3492
3493 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3494 u32 pid, u32 seq, int event, unsigned int flags)
3495 {
3496 struct nlmsghdr *nlh;
3497 u8 scope = RT_SCOPE_UNIVERSE;
3498 int ifindex = ifaca->aca_idev->dev->ifindex;
3499
3500 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3501 scope = RT_SCOPE_SITE;
3502
3503 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3504 if (nlh == NULL)
3505 return -EMSGSIZE;
3506
3507 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3508 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3509 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3510 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3511 nlmsg_cancel(skb, nlh);
3512 return -EMSGSIZE;
3513 }
3514
3515 return nlmsg_end(skb, nlh);
3516 }
3517
3518 enum addr_type_t
3519 {
3520 UNICAST_ADDR,
3521 MULTICAST_ADDR,
3522 ANYCAST_ADDR,
3523 };
3524
3525 /* called with rcu_read_lock() */
3526 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3527 struct netlink_callback *cb, enum addr_type_t type,
3528 int s_ip_idx, int *p_ip_idx)
3529 {
3530 struct inet6_ifaddr *ifa;
3531 struct ifmcaddr6 *ifmca;
3532 struct ifacaddr6 *ifaca;
3533 int err = 1;
3534 int ip_idx = *p_ip_idx;
3535
3536 read_lock_bh(&idev->lock);
3537 switch (type) {
3538 case UNICAST_ADDR:
3539 /* unicast address incl. temp addr */
3540 for (ifa = idev->addr_list; ifa;
3541 ifa = ifa->if_next, ip_idx++) {
3542 if (ip_idx < s_ip_idx)
3543 continue;
3544 err = inet6_fill_ifaddr(skb, ifa,
3545 NETLINK_CB(cb->skb).pid,
3546 cb->nlh->nlmsg_seq,
3547 RTM_NEWADDR,
3548 NLM_F_MULTI);
3549 if (err <= 0)
3550 break;
3551 }
3552 break;
3553 case MULTICAST_ADDR:
3554 /* multicast address */
3555 for (ifmca = idev->mc_list; ifmca;
3556 ifmca = ifmca->next, ip_idx++) {
3557 if (ip_idx < s_ip_idx)
3558 continue;
3559 err = inet6_fill_ifmcaddr(skb, ifmca,
3560 NETLINK_CB(cb->skb).pid,
3561 cb->nlh->nlmsg_seq,
3562 RTM_GETMULTICAST,
3563 NLM_F_MULTI);
3564 if (err <= 0)
3565 break;
3566 }
3567 break;
3568 case ANYCAST_ADDR:
3569 /* anycast address */
3570 for (ifaca = idev->ac_list; ifaca;
3571 ifaca = ifaca->aca_next, ip_idx++) {
3572 if (ip_idx < s_ip_idx)
3573 continue;
3574 err = inet6_fill_ifacaddr(skb, ifaca,
3575 NETLINK_CB(cb->skb).pid,
3576 cb->nlh->nlmsg_seq,
3577 RTM_GETANYCAST,
3578 NLM_F_MULTI);
3579 if (err <= 0)
3580 break;
3581 }
3582 break;
3583 default:
3584 break;
3585 }
3586 read_unlock_bh(&idev->lock);
3587 *p_ip_idx = ip_idx;
3588 return err;
3589 }
3590
3591 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3592 enum addr_type_t type)
3593 {
3594 struct net *net = sock_net(skb->sk);
3595 int h, s_h;
3596 int idx, ip_idx;
3597 int s_idx, s_ip_idx;
3598 struct net_device *dev;
3599 struct inet6_dev *idev;
3600 struct hlist_head *head;
3601 struct hlist_node *node;
3602
3603 s_h = cb->args[0];
3604 s_idx = idx = cb->args[1];
3605 s_ip_idx = ip_idx = cb->args[2];
3606
3607 rcu_read_lock();
3608 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3609 idx = 0;
3610 head = &net->dev_index_head[h];
3611 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3612 if (idx < s_idx)
3613 goto cont;
3614 if (h > s_h || idx > s_idx)
3615 s_ip_idx = 0;
3616 ip_idx = 0;
3617 if ((idev = __in6_dev_get(dev)) == NULL)
3618 goto cont;
3619
3620 if (in6_dump_addrs(idev, skb, cb, type,
3621 s_ip_idx, &ip_idx) <= 0)
3622 goto done;
3623 cont:
3624 idx++;
3625 }
3626 }
3627 done:
3628 rcu_read_unlock();
3629 cb->args[0] = h;
3630 cb->args[1] = idx;
3631 cb->args[2] = ip_idx;
3632
3633 return skb->len;
3634 }
3635
3636 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3637 {
3638 enum addr_type_t type = UNICAST_ADDR;
3639
3640 return inet6_dump_addr(skb, cb, type);
3641 }
3642
3643 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3644 {
3645 enum addr_type_t type = MULTICAST_ADDR;
3646
3647 return inet6_dump_addr(skb, cb, type);
3648 }
3649
3650
3651 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3652 {
3653 enum addr_type_t type = ANYCAST_ADDR;
3654
3655 return inet6_dump_addr(skb, cb, type);
3656 }
3657
3658 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3659 void *arg)
3660 {
3661 struct net *net = sock_net(in_skb->sk);
3662 struct ifaddrmsg *ifm;
3663 struct nlattr *tb[IFA_MAX+1];
3664 struct in6_addr *addr = NULL;
3665 struct net_device *dev = NULL;
3666 struct inet6_ifaddr *ifa;
3667 struct sk_buff *skb;
3668 int err;
3669
3670 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3671 if (err < 0)
3672 goto errout;
3673
3674 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3675 if (addr == NULL) {
3676 err = -EINVAL;
3677 goto errout;
3678 }
3679
3680 ifm = nlmsg_data(nlh);
3681 if (ifm->ifa_index)
3682 dev = __dev_get_by_index(net, ifm->ifa_index);
3683
3684 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3685 err = -EADDRNOTAVAIL;
3686 goto errout;
3687 }
3688
3689 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3690 err = -ENOBUFS;
3691 goto errout_ifa;
3692 }
3693
3694 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3695 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3696 if (err < 0) {
3697 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3698 WARN_ON(err == -EMSGSIZE);
3699 kfree_skb(skb);
3700 goto errout_ifa;
3701 }
3702 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3703 errout_ifa:
3704 in6_ifa_put(ifa);
3705 errout:
3706 return err;
3707 }
3708
3709 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3710 {
3711 struct sk_buff *skb;
3712 struct net *net = dev_net(ifa->idev->dev);
3713 int err = -ENOBUFS;
3714
3715 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3716 if (skb == NULL)
3717 goto errout;
3718
3719 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3720 if (err < 0) {
3721 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3722 WARN_ON(err == -EMSGSIZE);
3723 kfree_skb(skb);
3724 goto errout;
3725 }
3726 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3727 return;
3728 errout:
3729 if (err < 0)
3730 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3731 }
3732
3733 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3734 __s32 *array, int bytes)
3735 {
3736 BUG_ON(bytes < (DEVCONF_MAX * 4));
3737
3738 memset(array, 0, bytes);
3739 array[DEVCONF_FORWARDING] = cnf->forwarding;
3740 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3741 array[DEVCONF_MTU6] = cnf->mtu6;
3742 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3743 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3744 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3745 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3746 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3747 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3748 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3749 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3750 #ifdef CONFIG_IPV6_PRIVACY
3751 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3752 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3753 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3754 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3755 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3756 #endif
3757 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3758 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3759 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3760 #ifdef CONFIG_IPV6_ROUTER_PREF
3761 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3762 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3763 #ifdef CONFIG_IPV6_ROUTE_INFO
3764 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3765 #endif
3766 #endif
3767 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3768 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3769 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3770 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3771 #endif
3772 #ifdef CONFIG_IPV6_MROUTE
3773 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3774 #endif
3775 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3776 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3777 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3778 }
3779
3780 static inline size_t inet6_if_nlmsg_size(void)
3781 {
3782 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3783 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3784 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3785 + nla_total_size(4) /* IFLA_MTU */
3786 + nla_total_size(4) /* IFLA_LINK */
3787 + nla_total_size( /* IFLA_PROTINFO */
3788 nla_total_size(4) /* IFLA_INET6_FLAGS */
3789 + nla_total_size(sizeof(struct ifla_cacheinfo))
3790 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3791 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3792 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3793 );
3794 }
3795
3796 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3797 int items, int bytes)
3798 {
3799 int i;
3800 int pad = bytes - sizeof(u64) * items;
3801 BUG_ON(pad < 0);
3802
3803 /* Use put_unaligned() because stats may not be aligned for u64. */
3804 put_unaligned(items, &stats[0]);
3805 for (i = 1; i < items; i++)
3806 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3807
3808 memset(&stats[items], 0, pad);
3809 }
3810
3811 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3812 int bytes)
3813 {
3814 switch(attrtype) {
3815 case IFLA_INET6_STATS:
3816 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3817 break;
3818 case IFLA_INET6_ICMP6STATS:
3819 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3820 break;
3821 }
3822 }
3823
3824 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3825 u32 pid, u32 seq, int event, unsigned int flags)
3826 {
3827 struct net_device *dev = idev->dev;
3828 struct nlattr *nla;
3829 struct ifinfomsg *hdr;
3830 struct nlmsghdr *nlh;
3831 void *protoinfo;
3832 struct ifla_cacheinfo ci;
3833
3834 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3835 if (nlh == NULL)
3836 return -EMSGSIZE;
3837
3838 hdr = nlmsg_data(nlh);
3839 hdr->ifi_family = AF_INET6;
3840 hdr->__ifi_pad = 0;
3841 hdr->ifi_type = dev->type;
3842 hdr->ifi_index = dev->ifindex;
3843 hdr->ifi_flags = dev_get_flags(dev);
3844 hdr->ifi_change = 0;
3845
3846 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3847
3848 if (dev->addr_len)
3849 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3850
3851 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3852 if (dev->ifindex != dev->iflink)
3853 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3854
3855 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3856 if (protoinfo == NULL)
3857 goto nla_put_failure;
3858
3859 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3860
3861 ci.max_reasm_len = IPV6_MAXPLEN;
3862 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3863 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3864 ci.reachable_time = idev->nd_parms->reachable_time;
3865 ci.retrans_time = idev->nd_parms->retrans_time;
3866 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3867
3868 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3869 if (nla == NULL)
3870 goto nla_put_failure;
3871 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3872
3873 /* XXX - MC not implemented */
3874
3875 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3876 if (nla == NULL)
3877 goto nla_put_failure;
3878 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3879
3880 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3881 if (nla == NULL)
3882 goto nla_put_failure;
3883 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3884
3885 nla_nest_end(skb, protoinfo);
3886 return nlmsg_end(skb, nlh);
3887
3888 nla_put_failure:
3889 nlmsg_cancel(skb, nlh);
3890 return -EMSGSIZE;
3891 }
3892
3893 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3894 {
3895 struct net *net = sock_net(skb->sk);
3896 int h, s_h;
3897 int idx = 0, s_idx;
3898 struct net_device *dev;
3899 struct inet6_dev *idev;
3900 struct hlist_head *head;
3901 struct hlist_node *node;
3902
3903 s_h = cb->args[0];
3904 s_idx = cb->args[1];
3905
3906 rcu_read_lock();
3907 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3908 idx = 0;
3909 head = &net->dev_index_head[h];
3910 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3911 if (idx < s_idx)
3912 goto cont;
3913 idev = __in6_dev_get(dev);
3914 if (!idev)
3915 goto cont;
3916 if (inet6_fill_ifinfo(skb, idev,
3917 NETLINK_CB(cb->skb).pid,
3918 cb->nlh->nlmsg_seq,
3919 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3920 goto out;
3921 cont:
3922 idx++;
3923 }
3924 }
3925 out:
3926 rcu_read_unlock();
3927 cb->args[1] = idx;
3928 cb->args[0] = h;
3929
3930 return skb->len;
3931 }
3932
3933 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3934 {
3935 struct sk_buff *skb;
3936 struct net *net = dev_net(idev->dev);
3937 int err = -ENOBUFS;
3938
3939 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3940 if (skb == NULL)
3941 goto errout;
3942
3943 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3944 if (err < 0) {
3945 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3946 WARN_ON(err == -EMSGSIZE);
3947 kfree_skb(skb);
3948 goto errout;
3949 }
3950 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3951 return;
3952 errout:
3953 if (err < 0)
3954 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3955 }
3956
3957 static inline size_t inet6_prefix_nlmsg_size(void)
3958 {
3959 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3960 + nla_total_size(sizeof(struct in6_addr))
3961 + nla_total_size(sizeof(struct prefix_cacheinfo));
3962 }
3963
3964 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3965 struct prefix_info *pinfo, u32 pid, u32 seq,
3966 int event, unsigned int flags)
3967 {
3968 struct prefixmsg *pmsg;
3969 struct nlmsghdr *nlh;
3970 struct prefix_cacheinfo ci;
3971
3972 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3973 if (nlh == NULL)
3974 return -EMSGSIZE;
3975
3976 pmsg = nlmsg_data(nlh);
3977 pmsg->prefix_family = AF_INET6;
3978 pmsg->prefix_pad1 = 0;
3979 pmsg->prefix_pad2 = 0;
3980 pmsg->prefix_ifindex = idev->dev->ifindex;
3981 pmsg->prefix_len = pinfo->prefix_len;
3982 pmsg->prefix_type = pinfo->type;
3983 pmsg->prefix_pad3 = 0;
3984 pmsg->prefix_flags = 0;
3985 if (pinfo->onlink)
3986 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3987 if (pinfo->autoconf)
3988 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3989
3990 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3991
3992 ci.preferred_time = ntohl(pinfo->prefered);
3993 ci.valid_time = ntohl(pinfo->valid);
3994 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3995
3996 return nlmsg_end(skb, nlh);
3997
3998 nla_put_failure:
3999 nlmsg_cancel(skb, nlh);
4000 return -EMSGSIZE;
4001 }
4002
4003 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4004 struct prefix_info *pinfo)
4005 {
4006 struct sk_buff *skb;
4007 struct net *net = dev_net(idev->dev);
4008 int err = -ENOBUFS;
4009
4010 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4011 if (skb == NULL)
4012 goto errout;
4013
4014 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4015 if (err < 0) {
4016 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4017 WARN_ON(err == -EMSGSIZE);
4018 kfree_skb(skb);
4019 goto errout;
4020 }
4021 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4022 return;
4023 errout:
4024 if (err < 0)
4025 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4026 }
4027
4028 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4029 {
4030 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4031
4032 switch (event) {
4033 case RTM_NEWADDR:
4034 /*
4035 * If the address was optimistic
4036 * we inserted the route at the start of
4037 * our DAD process, so we don't need
4038 * to do it again
4039 */
4040 if (!(ifp->rt->rt6i_node))
4041 ip6_ins_rt(ifp->rt);
4042 if (ifp->idev->cnf.forwarding)
4043 addrconf_join_anycast(ifp);
4044 break;
4045 case RTM_DELADDR:
4046 if (ifp->idev->cnf.forwarding)
4047 addrconf_leave_anycast(ifp);
4048 addrconf_leave_solict(ifp->idev, &ifp->addr);
4049 dst_hold(&ifp->rt->u.dst);
4050 if (ip6_del_rt(ifp->rt))
4051 dst_free(&ifp->rt->u.dst);
4052 break;
4053 }
4054 }
4055
4056 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4057 {
4058 rcu_read_lock_bh();
4059 if (likely(ifp->idev->dead == 0))
4060 __ipv6_ifa_notify(event, ifp);
4061 rcu_read_unlock_bh();
4062 }
4063
4064 #ifdef CONFIG_SYSCTL
4065
4066 static
4067 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4068 void __user *buffer, size_t *lenp, loff_t *ppos)
4069 {
4070 int *valp = ctl->data;
4071 int val = *valp;
4072 loff_t pos = *ppos;
4073 int ret;
4074
4075 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4076
4077 if (write)
4078 ret = addrconf_fixup_forwarding(ctl, valp, val);
4079 if (ret)
4080 *ppos = pos;
4081 return ret;
4082 }
4083
4084 static void dev_disable_change(struct inet6_dev *idev)
4085 {
4086 if (!idev || !idev->dev)
4087 return;
4088
4089 if (idev->cnf.disable_ipv6)
4090 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4091 else
4092 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4093 }
4094
4095 static void addrconf_disable_change(struct net *net, __s32 newf)
4096 {
4097 struct net_device *dev;
4098 struct inet6_dev *idev;
4099
4100 rcu_read_lock();
4101 for_each_netdev_rcu(net, dev) {
4102 idev = __in6_dev_get(dev);
4103 if (idev) {
4104 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4105 idev->cnf.disable_ipv6 = newf;
4106 if (changed)
4107 dev_disable_change(idev);
4108 }
4109 }
4110 rcu_read_unlock();
4111 }
4112
4113 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4114 {
4115 struct net *net;
4116
4117 net = (struct net *)table->extra2;
4118
4119 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4120 return 0;
4121
4122 if (!rtnl_trylock()) {
4123 /* Restore the original values before restarting */
4124 *p = old;
4125 return restart_syscall();
4126 }
4127
4128 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4129 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4130 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4131 addrconf_disable_change(net, newf);
4132 } else if ((!*p) ^ (!old))
4133 dev_disable_change((struct inet6_dev *)table->extra1);
4134
4135 rtnl_unlock();
4136 return 0;
4137 }
4138
4139 static
4140 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4141 void __user *buffer, size_t *lenp, loff_t *ppos)
4142 {
4143 int *valp = ctl->data;
4144 int val = *valp;
4145 loff_t pos = *ppos;
4146 int ret;
4147
4148 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4149
4150 if (write)
4151 ret = addrconf_disable_ipv6(ctl, valp, val);
4152 if (ret)
4153 *ppos = pos;
4154 return ret;
4155 }
4156
4157 static struct addrconf_sysctl_table
4158 {
4159 struct ctl_table_header *sysctl_header;
4160 ctl_table addrconf_vars[DEVCONF_MAX+1];
4161 char *dev_name;
4162 } addrconf_sysctl __read_mostly = {
4163 .sysctl_header = NULL,
4164 .addrconf_vars = {
4165 {
4166 .procname = "forwarding",
4167 .data = &ipv6_devconf.forwarding,
4168 .maxlen = sizeof(int),
4169 .mode = 0644,
4170 .proc_handler = addrconf_sysctl_forward,
4171 },
4172 {
4173 .procname = "hop_limit",
4174 .data = &ipv6_devconf.hop_limit,
4175 .maxlen = sizeof(int),
4176 .mode = 0644,
4177 .proc_handler = proc_dointvec,
4178 },
4179 {
4180 .procname = "mtu",
4181 .data = &ipv6_devconf.mtu6,
4182 .maxlen = sizeof(int),
4183 .mode = 0644,
4184 .proc_handler = proc_dointvec,
4185 },
4186 {
4187 .procname = "accept_ra",
4188 .data = &ipv6_devconf.accept_ra,
4189 .maxlen = sizeof(int),
4190 .mode = 0644,
4191 .proc_handler = proc_dointvec,
4192 },
4193 {
4194 .procname = "accept_redirects",
4195 .data = &ipv6_devconf.accept_redirects,
4196 .maxlen = sizeof(int),
4197 .mode = 0644,
4198 .proc_handler = proc_dointvec,
4199 },
4200 {
4201 .procname = "autoconf",
4202 .data = &ipv6_devconf.autoconf,
4203 .maxlen = sizeof(int),
4204 .mode = 0644,
4205 .proc_handler = proc_dointvec,
4206 },
4207 {
4208 .procname = "dad_transmits",
4209 .data = &ipv6_devconf.dad_transmits,
4210 .maxlen = sizeof(int),
4211 .mode = 0644,
4212 .proc_handler = proc_dointvec,
4213 },
4214 {
4215 .procname = "router_solicitations",
4216 .data = &ipv6_devconf.rtr_solicits,
4217 .maxlen = sizeof(int),
4218 .mode = 0644,
4219 .proc_handler = proc_dointvec,
4220 },
4221 {
4222 .procname = "router_solicitation_interval",
4223 .data = &ipv6_devconf.rtr_solicit_interval,
4224 .maxlen = sizeof(int),
4225 .mode = 0644,
4226 .proc_handler = proc_dointvec_jiffies,
4227 },
4228 {
4229 .procname = "router_solicitation_delay",
4230 .data = &ipv6_devconf.rtr_solicit_delay,
4231 .maxlen = sizeof(int),
4232 .mode = 0644,
4233 .proc_handler = proc_dointvec_jiffies,
4234 },
4235 {
4236 .procname = "force_mld_version",
4237 .data = &ipv6_devconf.force_mld_version,
4238 .maxlen = sizeof(int),
4239 .mode = 0644,
4240 .proc_handler = proc_dointvec,
4241 },
4242 #ifdef CONFIG_IPV6_PRIVACY
4243 {
4244 .procname = "use_tempaddr",
4245 .data = &ipv6_devconf.use_tempaddr,
4246 .maxlen = sizeof(int),
4247 .mode = 0644,
4248 .proc_handler = proc_dointvec,
4249 },
4250 {
4251 .procname = "temp_valid_lft",
4252 .data = &ipv6_devconf.temp_valid_lft,
4253 .maxlen = sizeof(int),
4254 .mode = 0644,
4255 .proc_handler = proc_dointvec,
4256 },
4257 {
4258 .procname = "temp_prefered_lft",
4259 .data = &ipv6_devconf.temp_prefered_lft,
4260 .maxlen = sizeof(int),
4261 .mode = 0644,
4262 .proc_handler = proc_dointvec,
4263 },
4264 {
4265 .procname = "regen_max_retry",
4266 .data = &ipv6_devconf.regen_max_retry,
4267 .maxlen = sizeof(int),
4268 .mode = 0644,
4269 .proc_handler = proc_dointvec,
4270 },
4271 {
4272 .procname = "max_desync_factor",
4273 .data = &ipv6_devconf.max_desync_factor,
4274 .maxlen = sizeof(int),
4275 .mode = 0644,
4276 .proc_handler = proc_dointvec,
4277 },
4278 #endif
4279 {
4280 .procname = "max_addresses",
4281 .data = &ipv6_devconf.max_addresses,
4282 .maxlen = sizeof(int),
4283 .mode = 0644,
4284 .proc_handler = proc_dointvec,
4285 },
4286 {
4287 .procname = "accept_ra_defrtr",
4288 .data = &ipv6_devconf.accept_ra_defrtr,
4289 .maxlen = sizeof(int),
4290 .mode = 0644,
4291 .proc_handler = proc_dointvec,
4292 },
4293 {
4294 .procname = "accept_ra_pinfo",
4295 .data = &ipv6_devconf.accept_ra_pinfo,
4296 .maxlen = sizeof(int),
4297 .mode = 0644,
4298 .proc_handler = proc_dointvec,
4299 },
4300 #ifdef CONFIG_IPV6_ROUTER_PREF
4301 {
4302 .procname = "accept_ra_rtr_pref",
4303 .data = &ipv6_devconf.accept_ra_rtr_pref,
4304 .maxlen = sizeof(int),
4305 .mode = 0644,
4306 .proc_handler = proc_dointvec,
4307 },
4308 {
4309 .procname = "router_probe_interval",
4310 .data = &ipv6_devconf.rtr_probe_interval,
4311 .maxlen = sizeof(int),
4312 .mode = 0644,
4313 .proc_handler = proc_dointvec_jiffies,
4314 },
4315 #ifdef CONFIG_IPV6_ROUTE_INFO
4316 {
4317 .procname = "accept_ra_rt_info_max_plen",
4318 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4319 .maxlen = sizeof(int),
4320 .mode = 0644,
4321 .proc_handler = proc_dointvec,
4322 },
4323 #endif
4324 #endif
4325 {
4326 .procname = "proxy_ndp",
4327 .data = &ipv6_devconf.proxy_ndp,
4328 .maxlen = sizeof(int),
4329 .mode = 0644,
4330 .proc_handler = proc_dointvec,
4331 },
4332 {
4333 .procname = "accept_source_route",
4334 .data = &ipv6_devconf.accept_source_route,
4335 .maxlen = sizeof(int),
4336 .mode = 0644,
4337 .proc_handler = proc_dointvec,
4338 },
4339 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4340 {
4341 .procname = "optimistic_dad",
4342 .data = &ipv6_devconf.optimistic_dad,
4343 .maxlen = sizeof(int),
4344 .mode = 0644,
4345 .proc_handler = proc_dointvec,
4346
4347 },
4348 #endif
4349 #ifdef CONFIG_IPV6_MROUTE
4350 {
4351 .procname = "mc_forwarding",
4352 .data = &ipv6_devconf.mc_forwarding,
4353 .maxlen = sizeof(int),
4354 .mode = 0444,
4355 .proc_handler = proc_dointvec,
4356 },
4357 #endif
4358 {
4359 .procname = "disable_ipv6",
4360 .data = &ipv6_devconf.disable_ipv6,
4361 .maxlen = sizeof(int),
4362 .mode = 0644,
4363 .proc_handler = addrconf_sysctl_disable,
4364 },
4365 {
4366 .procname = "accept_dad",
4367 .data = &ipv6_devconf.accept_dad,
4368 .maxlen = sizeof(int),
4369 .mode = 0644,
4370 .proc_handler = proc_dointvec,
4371 },
4372 {
4373 .procname = "force_tllao",
4374 .data = &ipv6_devconf.force_tllao,
4375 .maxlen = sizeof(int),
4376 .mode = 0644,
4377 .proc_handler = proc_dointvec
4378 },
4379 {
4380 /* sentinel */
4381 }
4382 },
4383 };
4384
4385 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4386 struct inet6_dev *idev, struct ipv6_devconf *p)
4387 {
4388 int i;
4389 struct addrconf_sysctl_table *t;
4390
4391 #define ADDRCONF_CTL_PATH_DEV 3
4392
4393 struct ctl_path addrconf_ctl_path[] = {
4394 { .procname = "net", },
4395 { .procname = "ipv6", },
4396 { .procname = "conf", },
4397 { /* to be set */ },
4398 { },
4399 };
4400
4401
4402 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4403 if (t == NULL)
4404 goto out;
4405
4406 for (i=0; t->addrconf_vars[i].data; i++) {
4407 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4408 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4409 t->addrconf_vars[i].extra2 = net;
4410 }
4411
4412 /*
4413 * Make a copy of dev_name, because '.procname' is regarded as const
4414 * by sysctl and we wouldn't want anyone to change it under our feet
4415 * (see SIOCSIFNAME).
4416 */
4417 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4418 if (!t->dev_name)
4419 goto free;
4420
4421 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4422
4423 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4424 t->addrconf_vars);
4425 if (t->sysctl_header == NULL)
4426 goto free_procname;
4427
4428 p->sysctl = t;
4429 return 0;
4430
4431 free_procname:
4432 kfree(t->dev_name);
4433 free:
4434 kfree(t);
4435 out:
4436 return -ENOBUFS;
4437 }
4438
4439 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4440 {
4441 struct addrconf_sysctl_table *t;
4442
4443 if (p->sysctl == NULL)
4444 return;
4445
4446 t = p->sysctl;
4447 p->sysctl = NULL;
4448 unregister_sysctl_table(t->sysctl_header);
4449 kfree(t->dev_name);
4450 kfree(t);
4451 }
4452
4453 static void addrconf_sysctl_register(struct inet6_dev *idev)
4454 {
4455 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4456 &ndisc_ifinfo_sysctl_change);
4457 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4458 idev, &idev->cnf);
4459 }
4460
4461 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4462 {
4463 __addrconf_sysctl_unregister(&idev->cnf);
4464 neigh_sysctl_unregister(idev->nd_parms);
4465 }
4466
4467
4468 #endif
4469
4470 static int __net_init addrconf_init_net(struct net *net)
4471 {
4472 int err;
4473 struct ipv6_devconf *all, *dflt;
4474
4475 err = -ENOMEM;
4476 all = &ipv6_devconf;
4477 dflt = &ipv6_devconf_dflt;
4478
4479 if (!net_eq(net, &init_net)) {
4480 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4481 if (all == NULL)
4482 goto err_alloc_all;
4483
4484 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4485 if (dflt == NULL)
4486 goto err_alloc_dflt;
4487 } else {
4488 /* these will be inherited by all namespaces */
4489 dflt->autoconf = ipv6_defaults.autoconf;
4490 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4491 }
4492
4493 net->ipv6.devconf_all = all;
4494 net->ipv6.devconf_dflt = dflt;
4495
4496 #ifdef CONFIG_SYSCTL
4497 err = __addrconf_sysctl_register(net, "all", NULL, all);
4498 if (err < 0)
4499 goto err_reg_all;
4500
4501 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4502 if (err < 0)
4503 goto err_reg_dflt;
4504 #endif
4505 return 0;
4506
4507 #ifdef CONFIG_SYSCTL
4508 err_reg_dflt:
4509 __addrconf_sysctl_unregister(all);
4510 err_reg_all:
4511 kfree(dflt);
4512 #endif
4513 err_alloc_dflt:
4514 kfree(all);
4515 err_alloc_all:
4516 return err;
4517 }
4518
4519 static void __net_exit addrconf_exit_net(struct net *net)
4520 {
4521 #ifdef CONFIG_SYSCTL
4522 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4523 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4524 #endif
4525 if (!net_eq(net, &init_net)) {
4526 kfree(net->ipv6.devconf_dflt);
4527 kfree(net->ipv6.devconf_all);
4528 }
4529 }
4530
4531 static struct pernet_operations addrconf_ops = {
4532 .init = addrconf_init_net,
4533 .exit = addrconf_exit_net,
4534 };
4535
4536 /*
4537 * Device notifier
4538 */
4539
4540 int register_inet6addr_notifier(struct notifier_block *nb)
4541 {
4542 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4543 }
4544
4545 EXPORT_SYMBOL(register_inet6addr_notifier);
4546
4547 int unregister_inet6addr_notifier(struct notifier_block *nb)
4548 {
4549 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4550 }
4551
4552 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4553
4554 /*
4555 * Init / cleanup code
4556 */
4557
4558 int __init addrconf_init(void)
4559 {
4560 int err;
4561
4562 if ((err = ipv6_addr_label_init()) < 0) {
4563 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4564 err);
4565 return err;
4566 }
4567
4568 register_pernet_subsys(&addrconf_ops);
4569
4570 /* The addrconf netdev notifier requires that loopback_dev
4571 * has it's ipv6 private information allocated and setup
4572 * before it can bring up and give link-local addresses
4573 * to other devices which are up.
4574 *
4575 * Unfortunately, loopback_dev is not necessarily the first
4576 * entry in the global dev_base list of net devices. In fact,
4577 * it is likely to be the very last entry on that list.
4578 * So this causes the notifier registry below to try and
4579 * give link-local addresses to all devices besides loopback_dev
4580 * first, then loopback_dev, which cases all the non-loopback_dev
4581 * devices to fail to get a link-local address.
4582 *
4583 * So, as a temporary fix, allocate the ipv6 structure for
4584 * loopback_dev first by hand.
4585 * Longer term, all of the dependencies ipv6 has upon the loopback
4586 * device and it being up should be removed.
4587 */
4588 rtnl_lock();
4589 if (!ipv6_add_dev(init_net.loopback_dev))
4590 err = -ENOMEM;
4591 rtnl_unlock();
4592 if (err)
4593 goto errlo;
4594
4595 register_netdevice_notifier(&ipv6_dev_notf);
4596
4597 addrconf_verify(0);
4598
4599 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4600 if (err < 0)
4601 goto errout;
4602
4603 /* Only the first call to __rtnl_register can fail */
4604 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4605 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4606 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4607 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4608 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4609
4610 ipv6_addr_label_rtnl_register();
4611
4612 return 0;
4613 errout:
4614 unregister_netdevice_notifier(&ipv6_dev_notf);
4615 errlo:
4616 unregister_pernet_subsys(&addrconf_ops);
4617
4618 return err;
4619 }
4620
4621 void addrconf_cleanup(void)
4622 {
4623 struct inet6_ifaddr *ifa;
4624 struct net_device *dev;
4625 int i;
4626
4627 unregister_netdevice_notifier(&ipv6_dev_notf);
4628 unregister_pernet_subsys(&addrconf_ops);
4629
4630 rtnl_lock();
4631
4632 /* clean dev list */
4633 for_each_netdev(&init_net, dev) {
4634 if (__in6_dev_get(dev) == NULL)
4635 continue;
4636 addrconf_ifdown(dev, 1);
4637 }
4638 addrconf_ifdown(init_net.loopback_dev, 2);
4639
4640 /*
4641 * Check hash table.
4642 */
4643 write_lock_bh(&addrconf_hash_lock);
4644 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4645 for (ifa=inet6_addr_lst[i]; ifa; ) {
4646 struct inet6_ifaddr *bifa;
4647
4648 bifa = ifa;
4649 ifa = ifa->lst_next;
4650 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4651 /* Do not free it; something is wrong.
4652 Now we can investigate it with debugger.
4653 */
4654 }
4655 }
4656 write_unlock_bh(&addrconf_hash_lock);
4657
4658 del_timer(&addr_chk_timer);
4659 rtnl_unlock();
4660 }
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