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IPv6: addrconf cleanups
[deliverable/linux.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/kernel.h>
44 #include <linux/socket.h>
45 #include <linux/sockios.h>
46 #include <linux/net.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #ifdef CONFIG_SYSCTL
57 #include <linux/sysctl.h>
58 #endif
59 #include <linux/capability.h>
60 #include <linux/delay.h>
61 #include <linux/notifier.h>
62 #include <linux/string.h>
63
64 #include <net/net_namespace.h>
65 #include <net/sock.h>
66 #include <net/snmp.h>
67
68 #include <net/ipv6.h>
69 #include <net/protocol.h>
70 #include <net/ndisc.h>
71 #include <net/ip6_route.h>
72 #include <net/addrconf.h>
73 #include <net/tcp.h>
74 #include <net/ip.h>
75 #include <net/netlink.h>
76 #include <net/pkt_sched.h>
77 #include <linux/if_tunnel.h>
78 #include <linux/rtnetlink.h>
79
80 #ifdef CONFIG_IPV6_PRIVACY
81 #include <linux/random.h>
82 #endif
83
84 #include <asm/uaccess.h>
85 #include <asm/unaligned.h>
86
87 #include <linux/proc_fs.h>
88 #include <linux/seq_file.h>
89
90 /* Set to 3 to get tracing... */
91 #define ACONF_DEBUG 2
92
93 #if ACONF_DEBUG >= 3
94 #define ADBG(x) printk x
95 #else
96 #define ADBG(x)
97 #endif
98
99 #define INFINITY_LIFE_TIME 0xFFFFFFFF
100 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
101
102 #ifdef CONFIG_SYSCTL
103 static void addrconf_sysctl_register(struct inet6_dev *idev);
104 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
105 #else
106 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
107 {
108 }
109
110 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
111 {
112 }
113 #endif
114
115 #ifdef CONFIG_IPV6_PRIVACY
116 static int __ipv6_regen_rndid(struct inet6_dev *idev);
117 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
118 static void ipv6_regen_rndid(unsigned long data);
119
120 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
121 #endif
122
123 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
124 static int ipv6_count_addresses(struct inet6_dev *idev);
125
126 /*
127 * Configured unicast address hash table
128 */
129 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
130 static DEFINE_SPINLOCK(addrconf_hash_lock);
131
132 static void addrconf_verify(unsigned long);
133
134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
135 static DEFINE_SPINLOCK(addrconf_verify_lock);
136
137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139
140 static void addrconf_type_change(struct net_device *dev,
141 unsigned long event);
142 static int addrconf_ifdown(struct net_device *dev, int how);
143
144 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
145 static void addrconf_dad_timer(unsigned long data);
146 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
147 static void addrconf_dad_run(struct inet6_dev *idev);
148 static void addrconf_rs_timer(unsigned long data);
149 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
150 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
151
152 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
153 struct prefix_info *pinfo);
154 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
155 struct net_device *dev);
156
157 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
158
159 static struct ipv6_devconf ipv6_devconf __read_mostly = {
160 .forwarding = 0,
161 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
162 .mtu6 = IPV6_MIN_MTU,
163 .accept_ra = 1,
164 .accept_redirects = 1,
165 .autoconf = 1,
166 .force_mld_version = 0,
167 .dad_transmits = 1,
168 .rtr_solicits = MAX_RTR_SOLICITATIONS,
169 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
170 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
171 #ifdef CONFIG_IPV6_PRIVACY
172 .use_tempaddr = 0,
173 .temp_valid_lft = TEMP_VALID_LIFETIME,
174 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
175 .regen_max_retry = REGEN_MAX_RETRY,
176 .max_desync_factor = MAX_DESYNC_FACTOR,
177 #endif
178 .max_addresses = IPV6_MAX_ADDRESSES,
179 .accept_ra_defrtr = 1,
180 .accept_ra_pinfo = 1,
181 #ifdef CONFIG_IPV6_ROUTER_PREF
182 .accept_ra_rtr_pref = 1,
183 .rtr_probe_interval = 60 * HZ,
184 #ifdef CONFIG_IPV6_ROUTE_INFO
185 .accept_ra_rt_info_max_plen = 0,
186 #endif
187 #endif
188 .proxy_ndp = 0,
189 .accept_source_route = 0, /* we do not accept RH0 by default. */
190 .disable_ipv6 = 0,
191 .accept_dad = 1,
192 };
193
194 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
195 .forwarding = 0,
196 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
197 .mtu6 = IPV6_MIN_MTU,
198 .accept_ra = 1,
199 .accept_redirects = 1,
200 .autoconf = 1,
201 .dad_transmits = 1,
202 .rtr_solicits = MAX_RTR_SOLICITATIONS,
203 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
205 #ifdef CONFIG_IPV6_PRIVACY
206 .use_tempaddr = 0,
207 .temp_valid_lft = TEMP_VALID_LIFETIME,
208 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
209 .regen_max_retry = REGEN_MAX_RETRY,
210 .max_desync_factor = MAX_DESYNC_FACTOR,
211 #endif
212 .max_addresses = IPV6_MAX_ADDRESSES,
213 .accept_ra_defrtr = 1,
214 .accept_ra_pinfo = 1,
215 #ifdef CONFIG_IPV6_ROUTER_PREF
216 .accept_ra_rtr_pref = 1,
217 .rtr_probe_interval = 60 * HZ,
218 #ifdef CONFIG_IPV6_ROUTE_INFO
219 .accept_ra_rt_info_max_plen = 0,
220 #endif
221 #endif
222 .proxy_ndp = 0,
223 .accept_source_route = 0, /* we do not accept RH0 by default. */
224 .disable_ipv6 = 0,
225 .accept_dad = 1,
226 };
227
228 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
229 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
230 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
231 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
232 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
233
234 /* Check if a valid qdisc is available */
235 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
236 {
237 return !qdisc_tx_is_noop(dev);
238 }
239
240 /* Check if a route is valid prefix route */
241 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
242 {
243 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
244 }
245
246 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
247 {
248 if (del_timer(&ifp->timer))
249 __in6_ifa_put(ifp);
250 }
251
252 enum addrconf_timer_t
253 {
254 AC_NONE,
255 AC_DAD,
256 AC_RS,
257 };
258
259 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
260 enum addrconf_timer_t what,
261 unsigned long when)
262 {
263 if (!del_timer(&ifp->timer))
264 in6_ifa_hold(ifp);
265
266 switch (what) {
267 case AC_DAD:
268 ifp->timer.function = addrconf_dad_timer;
269 break;
270 case AC_RS:
271 ifp->timer.function = addrconf_rs_timer;
272 break;
273 default:;
274 }
275 ifp->timer.expires = jiffies + when;
276 add_timer(&ifp->timer);
277 }
278
279 static int snmp6_alloc_dev(struct inet6_dev *idev)
280 {
281 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
282 sizeof(struct ipstats_mib)) < 0)
283 goto err_ip;
284 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
285 sizeof(struct icmpv6_mib)) < 0)
286 goto err_icmp;
287 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
288 sizeof(struct icmpv6msg_mib)) < 0)
289 goto err_icmpmsg;
290
291 return 0;
292
293 err_icmpmsg:
294 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
295 err_icmp:
296 snmp_mib_free((void __percpu **)idev->stats.ipv6);
297 err_ip:
298 return -ENOMEM;
299 }
300
301 static void snmp6_free_dev(struct inet6_dev *idev)
302 {
303 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
304 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
305 snmp_mib_free((void __percpu **)idev->stats.ipv6);
306 }
307
308 /* Nobody refers to this device, we may destroy it. */
309
310 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
311 {
312 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
313 kfree(idev);
314 }
315
316 void in6_dev_finish_destroy(struct inet6_dev *idev)
317 {
318 struct net_device *dev = idev->dev;
319
320 WARN_ON(!list_empty(&idev->addr_list));
321 WARN_ON(idev->mc_list != NULL);
322
323 #ifdef NET_REFCNT_DEBUG
324 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
325 #endif
326 dev_put(dev);
327 if (!idev->dead) {
328 printk("Freeing alive inet6 device %p\n", idev);
329 return;
330 }
331 snmp6_free_dev(idev);
332 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
333 }
334
335 EXPORT_SYMBOL(in6_dev_finish_destroy);
336
337 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
338 {
339 struct inet6_dev *ndev;
340
341 ASSERT_RTNL();
342
343 if (dev->mtu < IPV6_MIN_MTU)
344 return NULL;
345
346 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
347
348 if (ndev == NULL)
349 return NULL;
350
351 rwlock_init(&ndev->lock);
352 ndev->dev = dev;
353 INIT_LIST_HEAD(&ndev->addr_list);
354
355 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
356 ndev->cnf.mtu6 = dev->mtu;
357 ndev->cnf.sysctl = NULL;
358 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
359 if (ndev->nd_parms == NULL) {
360 kfree(ndev);
361 return NULL;
362 }
363 if (ndev->cnf.forwarding)
364 dev_disable_lro(dev);
365 /* We refer to the device */
366 dev_hold(dev);
367
368 if (snmp6_alloc_dev(ndev) < 0) {
369 ADBG((KERN_WARNING
370 "%s(): cannot allocate memory for statistics; dev=%s.\n",
371 __func__, dev->name));
372 neigh_parms_release(&nd_tbl, ndev->nd_parms);
373 ndev->dead = 1;
374 in6_dev_finish_destroy(ndev);
375 return NULL;
376 }
377
378 if (snmp6_register_dev(ndev) < 0) {
379 ADBG((KERN_WARNING
380 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
381 __func__, dev->name));
382 neigh_parms_release(&nd_tbl, ndev->nd_parms);
383 ndev->dead = 1;
384 in6_dev_finish_destroy(ndev);
385 return NULL;
386 }
387
388 /* One reference from device. We must do this before
389 * we invoke __ipv6_regen_rndid().
390 */
391 in6_dev_hold(ndev);
392
393 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
394 ndev->cnf.accept_dad = -1;
395
396 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
397 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
398 printk(KERN_INFO
399 "%s: Disabled Multicast RS\n",
400 dev->name);
401 ndev->cnf.rtr_solicits = 0;
402 }
403 #endif
404
405 #ifdef CONFIG_IPV6_PRIVACY
406 INIT_LIST_HEAD(&ndev->tempaddr_list);
407 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
408 if ((dev->flags&IFF_LOOPBACK) ||
409 dev->type == ARPHRD_TUNNEL ||
410 dev->type == ARPHRD_TUNNEL6 ||
411 dev->type == ARPHRD_SIT ||
412 dev->type == ARPHRD_NONE) {
413 printk(KERN_INFO
414 "%s: Disabled Privacy Extensions\n",
415 dev->name);
416 ndev->cnf.use_tempaddr = -1;
417 } else {
418 in6_dev_hold(ndev);
419 ipv6_regen_rndid((unsigned long) ndev);
420 }
421 #endif
422
423 if (netif_running(dev) && addrconf_qdisc_ok(dev))
424 ndev->if_flags |= IF_READY;
425
426 ipv6_mc_init_dev(ndev);
427 ndev->tstamp = jiffies;
428 addrconf_sysctl_register(ndev);
429 /* protected by rtnl_lock */
430 rcu_assign_pointer(dev->ip6_ptr, ndev);
431
432 /* Join all-node multicast group */
433 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
434
435 return ndev;
436 }
437
438 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
439 {
440 struct inet6_dev *idev;
441
442 ASSERT_RTNL();
443
444 if ((idev = __in6_dev_get(dev)) == NULL) {
445 if ((idev = ipv6_add_dev(dev)) == NULL)
446 return NULL;
447 }
448
449 if (dev->flags&IFF_UP)
450 ipv6_mc_up(idev);
451 return idev;
452 }
453
454 #ifdef CONFIG_SYSCTL
455 static void dev_forward_change(struct inet6_dev *idev)
456 {
457 struct net_device *dev;
458 struct inet6_ifaddr *ifa;
459
460 if (!idev)
461 return;
462 dev = idev->dev;
463 if (idev->cnf.forwarding)
464 dev_disable_lro(dev);
465 if (dev && (dev->flags & IFF_MULTICAST)) {
466 if (idev->cnf.forwarding)
467 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
468 else
469 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
470 }
471
472 list_for_each_entry(ifa, &idev->addr_list, if_list) {
473 if (ifa->flags&IFA_F_TENTATIVE)
474 continue;
475 if (idev->cnf.forwarding)
476 addrconf_join_anycast(ifa);
477 else
478 addrconf_leave_anycast(ifa);
479 }
480 }
481
482
483 static void addrconf_forward_change(struct net *net, __s32 newf)
484 {
485 struct net_device *dev;
486 struct inet6_dev *idev;
487
488 rcu_read_lock();
489 for_each_netdev_rcu(net, dev) {
490 idev = __in6_dev_get(dev);
491 if (idev) {
492 int changed = (!idev->cnf.forwarding) ^ (!newf);
493 idev->cnf.forwarding = newf;
494 if (changed)
495 dev_forward_change(idev);
496 }
497 }
498 rcu_read_unlock();
499 }
500
501 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
502 {
503 struct net *net;
504
505 net = (struct net *)table->extra2;
506 if (p == &net->ipv6.devconf_dflt->forwarding)
507 return 0;
508
509 if (!rtnl_trylock()) {
510 /* Restore the original values before restarting */
511 *p = old;
512 return restart_syscall();
513 }
514
515 if (p == &net->ipv6.devconf_all->forwarding) {
516 __s32 newf = net->ipv6.devconf_all->forwarding;
517 net->ipv6.devconf_dflt->forwarding = newf;
518 addrconf_forward_change(net, newf);
519 } else if ((!*p) ^ (!old))
520 dev_forward_change((struct inet6_dev *)table->extra1);
521 rtnl_unlock();
522
523 if (*p)
524 rt6_purge_dflt_routers(net);
525 return 1;
526 }
527 #endif
528
529 static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
530 {
531 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
532 kfree(ifp);
533 }
534
535 /* Nobody refers to this ifaddr, destroy it */
536 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
537 {
538 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
539
540 #ifdef NET_REFCNT_DEBUG
541 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
542 #endif
543
544 in6_dev_put(ifp->idev);
545
546 if (del_timer(&ifp->timer))
547 printk("Timer is still running, when freeing ifa=%p\n", ifp);
548
549 if (!ifp->dead) {
550 printk("Freeing alive inet6 address %p\n", ifp);
551 return;
552 }
553 dst_release(&ifp->rt->u.dst);
554
555 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
556 }
557
558 static void
559 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
560 {
561 struct list_head *p;
562 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
563
564 /*
565 * Each device address list is sorted in order of scope -
566 * global before linklocal.
567 */
568 list_for_each(p, &idev->addr_list) {
569 struct inet6_ifaddr *ifa
570 = list_entry(p, struct inet6_ifaddr, if_list);
571 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
572 break;
573 }
574
575 list_add(&ifp->if_list, p);
576 }
577
578 static u32 ipv6_addr_hash(const struct in6_addr *addr)
579 {
580 /*
581 * We perform the hash function over the last 64 bits of the address
582 * This will include the IEEE address token on links that support it.
583 */
584 return jhash_2words(addr->s6_addr32[2], addr->s6_addr32[3], 0)
585 & (IN6_ADDR_HSIZE - 1);
586 }
587
588 /* On success it returns ifp with increased reference count */
589
590 static struct inet6_ifaddr *
591 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
592 int scope, u32 flags)
593 {
594 struct inet6_ifaddr *ifa = NULL;
595 struct rt6_info *rt;
596 unsigned int hash;
597 int err = 0;
598 int addr_type = ipv6_addr_type(addr);
599
600 if (addr_type == IPV6_ADDR_ANY ||
601 addr_type & IPV6_ADDR_MULTICAST ||
602 (!(idev->dev->flags & IFF_LOOPBACK) &&
603 addr_type & IPV6_ADDR_LOOPBACK))
604 return ERR_PTR(-EADDRNOTAVAIL);
605
606 rcu_read_lock_bh();
607 if (idev->dead) {
608 err = -ENODEV; /*XXX*/
609 goto out2;
610 }
611
612 if (idev->cnf.disable_ipv6) {
613 err = -EACCES;
614 goto out2;
615 }
616
617 spin_lock(&addrconf_hash_lock);
618
619 /* Ignore adding duplicate addresses on an interface */
620 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
621 ADBG(("ipv6_add_addr: already assigned\n"));
622 err = -EEXIST;
623 goto out;
624 }
625
626 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
627
628 if (ifa == NULL) {
629 ADBG(("ipv6_add_addr: malloc failed\n"));
630 err = -ENOBUFS;
631 goto out;
632 }
633
634 rt = addrconf_dst_alloc(idev, addr, 0);
635 if (IS_ERR(rt)) {
636 err = PTR_ERR(rt);
637 goto out;
638 }
639
640 ipv6_addr_copy(&ifa->addr, addr);
641
642 spin_lock_init(&ifa->lock);
643 init_timer(&ifa->timer);
644 INIT_HLIST_NODE(&ifa->addr_lst);
645 ifa->timer.data = (unsigned long) ifa;
646 ifa->scope = scope;
647 ifa->prefix_len = pfxlen;
648 ifa->flags = flags | IFA_F_TENTATIVE;
649 ifa->cstamp = ifa->tstamp = jiffies;
650
651 ifa->rt = rt;
652
653 /*
654 * part one of RFC 4429, section 3.3
655 * We should not configure an address as
656 * optimistic if we do not yet know the link
657 * layer address of our nexhop router
658 */
659
660 if (rt->rt6i_nexthop == NULL)
661 ifa->flags &= ~IFA_F_OPTIMISTIC;
662
663 ifa->idev = idev;
664 in6_dev_hold(idev);
665 /* For caller */
666 in6_ifa_hold(ifa);
667
668 /* Add to big hash table */
669 hash = ipv6_addr_hash(addr);
670
671 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
672 in6_ifa_hold(ifa);
673 spin_unlock(&addrconf_hash_lock);
674
675 write_lock(&idev->lock);
676 /* Add to inet6_dev unicast addr list. */
677 ipv6_link_dev_addr(idev, ifa);
678
679 #ifdef CONFIG_IPV6_PRIVACY
680 if (ifa->flags&IFA_F_TEMPORARY) {
681 list_add(&ifa->tmp_list, &idev->tempaddr_list);
682 in6_ifa_hold(ifa);
683 }
684 #endif
685
686 in6_ifa_hold(ifa);
687 write_unlock(&idev->lock);
688 out2:
689 rcu_read_unlock_bh();
690
691 if (likely(err == 0))
692 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
693 else {
694 kfree(ifa);
695 ifa = ERR_PTR(err);
696 }
697
698 return ifa;
699 out:
700 spin_unlock(&addrconf_hash_lock);
701 goto out2;
702 }
703
704 /* This function wants to get referenced ifp and releases it before return */
705
706 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
707 {
708 struct inet6_ifaddr *ifa, *ifn;
709 struct inet6_dev *idev = ifp->idev;
710 int hash;
711 int deleted = 0, onlink = 0;
712 unsigned long expires = jiffies;
713
714 hash = ipv6_addr_hash(&ifp->addr);
715
716 ifp->dead = 1;
717
718 spin_lock_bh(&addrconf_hash_lock);
719 hlist_del_init_rcu(&ifp->addr_lst);
720 __in6_ifa_put(ifp);
721 spin_unlock_bh(&addrconf_hash_lock);
722
723 write_lock_bh(&idev->lock);
724 #ifdef CONFIG_IPV6_PRIVACY
725 if (ifp->flags&IFA_F_TEMPORARY) {
726 list_del(&ifp->tmp_list);
727 if (ifp->ifpub) {
728 in6_ifa_put(ifp->ifpub);
729 ifp->ifpub = NULL;
730 }
731 __in6_ifa_put(ifp);
732 }
733 #endif
734
735 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
736 if (ifa == ifp) {
737 list_del_init(&ifp->if_list);
738 __in6_ifa_put(ifp);
739
740 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
741 break;
742 deleted = 1;
743 continue;
744 } else if (ifp->flags & IFA_F_PERMANENT) {
745 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
746 ifp->prefix_len)) {
747 if (ifa->flags & IFA_F_PERMANENT) {
748 onlink = 1;
749 if (deleted)
750 break;
751 } else {
752 unsigned long lifetime;
753
754 if (!onlink)
755 onlink = -1;
756
757 spin_lock(&ifa->lock);
758
759 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
760 /*
761 * Note: Because this address is
762 * not permanent, lifetime <
763 * LONG_MAX / HZ here.
764 */
765 if (time_before(expires,
766 ifa->tstamp + lifetime * HZ))
767 expires = ifa->tstamp + lifetime * HZ;
768 spin_unlock(&ifa->lock);
769 }
770 }
771 }
772 }
773 write_unlock_bh(&idev->lock);
774
775 addrconf_del_timer(ifp);
776
777 ipv6_ifa_notify(RTM_DELADDR, ifp);
778
779 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
780
781 /*
782 * Purge or update corresponding prefix
783 *
784 * 1) we don't purge prefix here if address was not permanent.
785 * prefix is managed by its own lifetime.
786 * 2) if there're no addresses, delete prefix.
787 * 3) if there're still other permanent address(es),
788 * corresponding prefix is still permanent.
789 * 4) otherwise, update prefix lifetime to the
790 * longest valid lifetime among the corresponding
791 * addresses on the device.
792 * Note: subsequent RA will update lifetime.
793 *
794 * --yoshfuji
795 */
796 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
797 struct in6_addr prefix;
798 struct rt6_info *rt;
799 struct net *net = dev_net(ifp->idev->dev);
800 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
801 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
802
803 if (rt && addrconf_is_prefix_route(rt)) {
804 if (onlink == 0) {
805 ip6_del_rt(rt);
806 rt = NULL;
807 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
808 rt->rt6i_expires = expires;
809 rt->rt6i_flags |= RTF_EXPIRES;
810 }
811 }
812 dst_release(&rt->u.dst);
813 }
814
815 in6_ifa_put(ifp);
816 }
817
818 #ifdef CONFIG_IPV6_PRIVACY
819 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
820 {
821 struct inet6_dev *idev = ifp->idev;
822 struct in6_addr addr, *tmpaddr;
823 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
824 unsigned long regen_advance;
825 int tmp_plen;
826 int ret = 0;
827 int max_addresses;
828 u32 addr_flags;
829
830 write_lock(&idev->lock);
831 if (ift) {
832 spin_lock_bh(&ift->lock);
833 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
834 spin_unlock_bh(&ift->lock);
835 tmpaddr = &addr;
836 } else {
837 tmpaddr = NULL;
838 }
839 retry:
840 in6_dev_hold(idev);
841 if (idev->cnf.use_tempaddr <= 0) {
842 write_unlock(&idev->lock);
843 printk(KERN_INFO
844 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
845 in6_dev_put(idev);
846 ret = -1;
847 goto out;
848 }
849 spin_lock_bh(&ifp->lock);
850 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
851 idev->cnf.use_tempaddr = -1; /*XXX*/
852 spin_unlock_bh(&ifp->lock);
853 write_unlock(&idev->lock);
854 printk(KERN_WARNING
855 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
856 in6_dev_put(idev);
857 ret = -1;
858 goto out;
859 }
860 in6_ifa_hold(ifp);
861 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
862 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
863 spin_unlock_bh(&ifp->lock);
864 write_unlock(&idev->lock);
865 printk(KERN_WARNING
866 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
867 in6_ifa_put(ifp);
868 in6_dev_put(idev);
869 ret = -1;
870 goto out;
871 }
872 memcpy(&addr.s6_addr[8], idev->rndid, 8);
873 tmp_valid_lft = min_t(__u32,
874 ifp->valid_lft,
875 idev->cnf.temp_valid_lft);
876 tmp_prefered_lft = min_t(__u32,
877 ifp->prefered_lft,
878 idev->cnf.temp_prefered_lft - desync_factor / HZ);
879 tmp_plen = ifp->prefix_len;
880 max_addresses = idev->cnf.max_addresses;
881 tmp_cstamp = ifp->cstamp;
882 tmp_tstamp = ifp->tstamp;
883 spin_unlock_bh(&ifp->lock);
884
885 regen_advance = idev->cnf.regen_max_retry *
886 idev->cnf.dad_transmits *
887 idev->nd_parms->retrans_time / HZ;
888 write_unlock(&idev->lock);
889
890 /* A temporary address is created only if this calculated Preferred
891 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
892 * an implementation must not create a temporary address with a zero
893 * Preferred Lifetime.
894 */
895 if (tmp_prefered_lft <= regen_advance) {
896 in6_ifa_put(ifp);
897 in6_dev_put(idev);
898 ret = -1;
899 goto out;
900 }
901
902 addr_flags = IFA_F_TEMPORARY;
903 /* set in addrconf_prefix_rcv() */
904 if (ifp->flags & IFA_F_OPTIMISTIC)
905 addr_flags |= IFA_F_OPTIMISTIC;
906
907 ift = !max_addresses ||
908 ipv6_count_addresses(idev) < max_addresses ?
909 ipv6_add_addr(idev, &addr, tmp_plen,
910 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
911 addr_flags) : NULL;
912 if (!ift || IS_ERR(ift)) {
913 in6_ifa_put(ifp);
914 in6_dev_put(idev);
915 printk(KERN_INFO
916 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
917 tmpaddr = &addr;
918 write_lock(&idev->lock);
919 goto retry;
920 }
921
922 spin_lock_bh(&ift->lock);
923 ift->ifpub = ifp;
924 ift->valid_lft = tmp_valid_lft;
925 ift->prefered_lft = tmp_prefered_lft;
926 ift->cstamp = tmp_cstamp;
927 ift->tstamp = tmp_tstamp;
928 spin_unlock_bh(&ift->lock);
929
930 addrconf_dad_start(ift, 0);
931 in6_ifa_put(ift);
932 in6_dev_put(idev);
933 out:
934 return ret;
935 }
936 #endif
937
938 /*
939 * Choose an appropriate source address (RFC3484)
940 */
941 enum {
942 IPV6_SADDR_RULE_INIT = 0,
943 IPV6_SADDR_RULE_LOCAL,
944 IPV6_SADDR_RULE_SCOPE,
945 IPV6_SADDR_RULE_PREFERRED,
946 #ifdef CONFIG_IPV6_MIP6
947 IPV6_SADDR_RULE_HOA,
948 #endif
949 IPV6_SADDR_RULE_OIF,
950 IPV6_SADDR_RULE_LABEL,
951 #ifdef CONFIG_IPV6_PRIVACY
952 IPV6_SADDR_RULE_PRIVACY,
953 #endif
954 IPV6_SADDR_RULE_ORCHID,
955 IPV6_SADDR_RULE_PREFIX,
956 IPV6_SADDR_RULE_MAX
957 };
958
959 struct ipv6_saddr_score {
960 int rule;
961 int addr_type;
962 struct inet6_ifaddr *ifa;
963 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
964 int scopedist;
965 int matchlen;
966 };
967
968 struct ipv6_saddr_dst {
969 const struct in6_addr *addr;
970 int ifindex;
971 int scope;
972 int label;
973 unsigned int prefs;
974 };
975
976 static inline int ipv6_saddr_preferred(int type)
977 {
978 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
979 return 1;
980 return 0;
981 }
982
983 static int ipv6_get_saddr_eval(struct net *net,
984 struct ipv6_saddr_score *score,
985 struct ipv6_saddr_dst *dst,
986 int i)
987 {
988 int ret;
989
990 if (i <= score->rule) {
991 switch (i) {
992 case IPV6_SADDR_RULE_SCOPE:
993 ret = score->scopedist;
994 break;
995 case IPV6_SADDR_RULE_PREFIX:
996 ret = score->matchlen;
997 break;
998 default:
999 ret = !!test_bit(i, score->scorebits);
1000 }
1001 goto out;
1002 }
1003
1004 switch (i) {
1005 case IPV6_SADDR_RULE_INIT:
1006 /* Rule 0: remember if hiscore is not ready yet */
1007 ret = !!score->ifa;
1008 break;
1009 case IPV6_SADDR_RULE_LOCAL:
1010 /* Rule 1: Prefer same address */
1011 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1012 break;
1013 case IPV6_SADDR_RULE_SCOPE:
1014 /* Rule 2: Prefer appropriate scope
1015 *
1016 * ret
1017 * ^
1018 * -1 | d 15
1019 * ---+--+-+---> scope
1020 * |
1021 * | d is scope of the destination.
1022 * B-d | \
1023 * | \ <- smaller scope is better if
1024 * B-15 | \ if scope is enough for destinaion.
1025 * | ret = B - scope (-1 <= scope >= d <= 15).
1026 * d-C-1 | /
1027 * |/ <- greater is better
1028 * -C / if scope is not enough for destination.
1029 * /| ret = scope - C (-1 <= d < scope <= 15).
1030 *
1031 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1032 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1033 * Assume B = 0 and we get C > 29.
1034 */
1035 ret = __ipv6_addr_src_scope(score->addr_type);
1036 if (ret >= dst->scope)
1037 ret = -ret;
1038 else
1039 ret -= 128; /* 30 is enough */
1040 score->scopedist = ret;
1041 break;
1042 case IPV6_SADDR_RULE_PREFERRED:
1043 /* Rule 3: Avoid deprecated and optimistic addresses */
1044 ret = ipv6_saddr_preferred(score->addr_type) ||
1045 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1046 break;
1047 #ifdef CONFIG_IPV6_MIP6
1048 case IPV6_SADDR_RULE_HOA:
1049 {
1050 /* Rule 4: Prefer home address */
1051 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1052 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1053 break;
1054 }
1055 #endif
1056 case IPV6_SADDR_RULE_OIF:
1057 /* Rule 5: Prefer outgoing interface */
1058 ret = (!dst->ifindex ||
1059 dst->ifindex == score->ifa->idev->dev->ifindex);
1060 break;
1061 case IPV6_SADDR_RULE_LABEL:
1062 /* Rule 6: Prefer matching label */
1063 ret = ipv6_addr_label(net,
1064 &score->ifa->addr, score->addr_type,
1065 score->ifa->idev->dev->ifindex) == dst->label;
1066 break;
1067 #ifdef CONFIG_IPV6_PRIVACY
1068 case IPV6_SADDR_RULE_PRIVACY:
1069 {
1070 /* Rule 7: Prefer public address
1071 * Note: prefer temprary address if use_tempaddr >= 2
1072 */
1073 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1074 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1075 score->ifa->idev->cnf.use_tempaddr >= 2;
1076 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1077 break;
1078 }
1079 #endif
1080 case IPV6_SADDR_RULE_ORCHID:
1081 /* Rule 8-: Prefer ORCHID vs ORCHID or
1082 * non-ORCHID vs non-ORCHID
1083 */
1084 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1085 ipv6_addr_orchid(dst->addr));
1086 break;
1087 case IPV6_SADDR_RULE_PREFIX:
1088 /* Rule 8: Use longest matching prefix */
1089 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1090 dst->addr);
1091 break;
1092 default:
1093 ret = 0;
1094 }
1095
1096 if (ret)
1097 __set_bit(i, score->scorebits);
1098 score->rule = i;
1099 out:
1100 return ret;
1101 }
1102
1103 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1104 const struct in6_addr *daddr, unsigned int prefs,
1105 struct in6_addr *saddr)
1106 {
1107 struct ipv6_saddr_score scores[2],
1108 *score = &scores[0], *hiscore = &scores[1];
1109 struct ipv6_saddr_dst dst;
1110 struct net_device *dev;
1111 int dst_type;
1112
1113 dst_type = __ipv6_addr_type(daddr);
1114 dst.addr = daddr;
1115 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1116 dst.scope = __ipv6_addr_src_scope(dst_type);
1117 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1118 dst.prefs = prefs;
1119
1120 hiscore->rule = -1;
1121 hiscore->ifa = NULL;
1122
1123 rcu_read_lock();
1124
1125 for_each_netdev_rcu(net, dev) {
1126 struct inet6_dev *idev;
1127
1128 /* Candidate Source Address (section 4)
1129 * - multicast and link-local destination address,
1130 * the set of candidate source address MUST only
1131 * include addresses assigned to interfaces
1132 * belonging to the same link as the outgoing
1133 * interface.
1134 * (- For site-local destination addresses, the
1135 * set of candidate source addresses MUST only
1136 * include addresses assigned to interfaces
1137 * belonging to the same site as the outgoing
1138 * interface.)
1139 */
1140 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1141 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1142 dst.ifindex && dev->ifindex != dst.ifindex)
1143 continue;
1144
1145 idev = __in6_dev_get(dev);
1146 if (!idev)
1147 continue;
1148
1149 read_lock_bh(&idev->lock);
1150 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1151 int i;
1152
1153 /*
1154 * - Tentative Address (RFC2462 section 5.4)
1155 * - A tentative address is not considered
1156 * "assigned to an interface" in the traditional
1157 * sense, unless it is also flagged as optimistic.
1158 * - Candidate Source Address (section 4)
1159 * - In any case, anycast addresses, multicast
1160 * addresses, and the unspecified address MUST
1161 * NOT be included in a candidate set.
1162 */
1163 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1164 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1165 continue;
1166
1167 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1168
1169 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1170 score->addr_type & IPV6_ADDR_MULTICAST)) {
1171 LIMIT_NETDEBUG(KERN_DEBUG
1172 "ADDRCONF: unspecified / multicast address "
1173 "assigned as unicast address on %s",
1174 dev->name);
1175 continue;
1176 }
1177
1178 score->rule = -1;
1179 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1180
1181 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1182 int minihiscore, miniscore;
1183
1184 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1185 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1186
1187 if (minihiscore > miniscore) {
1188 if (i == IPV6_SADDR_RULE_SCOPE &&
1189 score->scopedist > 0) {
1190 /*
1191 * special case:
1192 * each remaining entry
1193 * has too small (not enough)
1194 * scope, because ifa entries
1195 * are sorted by their scope
1196 * values.
1197 */
1198 goto try_nextdev;
1199 }
1200 break;
1201 } else if (minihiscore < miniscore) {
1202 if (hiscore->ifa)
1203 in6_ifa_put(hiscore->ifa);
1204
1205 in6_ifa_hold(score->ifa);
1206
1207 swap(hiscore, score);
1208
1209 /* restore our iterator */
1210 score->ifa = hiscore->ifa;
1211
1212 break;
1213 }
1214 }
1215 }
1216 try_nextdev:
1217 read_unlock_bh(&idev->lock);
1218 }
1219 rcu_read_unlock();
1220
1221 if (!hiscore->ifa)
1222 return -EADDRNOTAVAIL;
1223
1224 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1225 in6_ifa_put(hiscore->ifa);
1226 return 0;
1227 }
1228
1229 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1230
1231 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1232 unsigned char banned_flags)
1233 {
1234 struct inet6_dev *idev;
1235 int err = -EADDRNOTAVAIL;
1236
1237 rcu_read_lock();
1238 if ((idev = __in6_dev_get(dev)) != NULL) {
1239 struct inet6_ifaddr *ifp;
1240
1241 read_lock_bh(&idev->lock);
1242 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1243 if (ifp->scope == IFA_LINK &&
1244 !(ifp->flags & banned_flags)) {
1245 ipv6_addr_copy(addr, &ifp->addr);
1246 err = 0;
1247 break;
1248 }
1249 }
1250 read_unlock_bh(&idev->lock);
1251 }
1252 rcu_read_unlock();
1253 return err;
1254 }
1255
1256 static int ipv6_count_addresses(struct inet6_dev *idev)
1257 {
1258 int cnt = 0;
1259 struct inet6_ifaddr *ifp;
1260
1261 read_lock_bh(&idev->lock);
1262 list_for_each_entry(ifp, &idev->addr_list, if_list)
1263 cnt++;
1264 read_unlock_bh(&idev->lock);
1265 return cnt;
1266 }
1267
1268 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1269 struct net_device *dev, int strict)
1270 {
1271 struct inet6_ifaddr *ifp = NULL;
1272 struct hlist_node *node;
1273 unsigned int hash = ipv6_addr_hash(addr);
1274
1275 rcu_read_lock_bh();
1276 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1277 if (!net_eq(dev_net(ifp->idev->dev), net))
1278 continue;
1279 if (ipv6_addr_equal(&ifp->addr, addr) &&
1280 !(ifp->flags&IFA_F_TENTATIVE)) {
1281 if (dev == NULL || ifp->idev->dev == dev ||
1282 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1283 break;
1284 }
1285 }
1286 rcu_read_unlock_bh();
1287
1288 return ifp != NULL;
1289 }
1290 EXPORT_SYMBOL(ipv6_chk_addr);
1291
1292 static
1293 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1294 struct net_device *dev)
1295 {
1296 struct inet6_ifaddr *ifp;
1297 struct hlist_node *node;
1298 unsigned int hash = ipv6_addr_hash(addr);
1299
1300 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1301 if (!net_eq(dev_net(ifp->idev->dev), net))
1302 continue;
1303 if (ipv6_addr_equal(&ifp->addr, addr)) {
1304 if (dev == NULL || ifp->idev->dev == dev)
1305 break;
1306 }
1307 }
1308 return ifp != NULL;
1309 }
1310
1311 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1312 {
1313 struct inet6_dev *idev;
1314 struct inet6_ifaddr *ifa;
1315 int onlink;
1316
1317 onlink = 0;
1318 rcu_read_lock();
1319 idev = __in6_dev_get(dev);
1320 if (idev) {
1321 read_lock_bh(&idev->lock);
1322 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1323 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1324 ifa->prefix_len);
1325 if (onlink)
1326 break;
1327 }
1328 read_unlock_bh(&idev->lock);
1329 }
1330 rcu_read_unlock();
1331 return onlink;
1332 }
1333
1334 EXPORT_SYMBOL(ipv6_chk_prefix);
1335
1336 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1337 struct net_device *dev, int strict)
1338 {
1339 struct inet6_ifaddr *ifp = NULL;
1340 struct hlist_node *node;
1341 unsigned int hash = ipv6_addr_hash(addr);
1342
1343 rcu_read_lock_bh();
1344 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1345 if (!net_eq(dev_net(ifp->idev->dev), net))
1346 continue;
1347 if (ipv6_addr_equal(&ifp->addr, addr)) {
1348 if (dev == NULL || ifp->idev->dev == dev ||
1349 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1350 in6_ifa_hold(ifp);
1351 break;
1352 }
1353 }
1354 }
1355 rcu_read_unlock_bh();
1356
1357 return ifp;
1358 }
1359
1360 /* Gets referenced address, destroys ifaddr */
1361
1362 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1363 {
1364 if (ifp->flags&IFA_F_PERMANENT) {
1365 spin_lock_bh(&ifp->lock);
1366 addrconf_del_timer(ifp);
1367 ifp->flags |= IFA_F_TENTATIVE;
1368 if (dad_failed)
1369 ifp->flags |= IFA_F_DADFAILED;
1370 spin_unlock_bh(&ifp->lock);
1371 if (dad_failed)
1372 ipv6_ifa_notify(0, ifp);
1373 in6_ifa_put(ifp);
1374 #ifdef CONFIG_IPV6_PRIVACY
1375 } else if (ifp->flags&IFA_F_TEMPORARY) {
1376 struct inet6_ifaddr *ifpub;
1377 spin_lock_bh(&ifp->lock);
1378 ifpub = ifp->ifpub;
1379 if (ifpub) {
1380 in6_ifa_hold(ifpub);
1381 spin_unlock_bh(&ifp->lock);
1382 ipv6_create_tempaddr(ifpub, ifp);
1383 in6_ifa_put(ifpub);
1384 } else {
1385 spin_unlock_bh(&ifp->lock);
1386 }
1387 ipv6_del_addr(ifp);
1388 #endif
1389 } else
1390 ipv6_del_addr(ifp);
1391 }
1392
1393 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1394 {
1395 struct inet6_dev *idev = ifp->idev;
1396
1397 if (net_ratelimit())
1398 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1399 ifp->idev->dev->name, &ifp->addr);
1400
1401 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1402 struct in6_addr addr;
1403
1404 addr.s6_addr32[0] = htonl(0xfe800000);
1405 addr.s6_addr32[1] = 0;
1406
1407 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1408 ipv6_addr_equal(&ifp->addr, &addr)) {
1409 /* DAD failed for link-local based on MAC address */
1410 idev->cnf.disable_ipv6 = 1;
1411
1412 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1413 ifp->idev->dev->name);
1414 }
1415 }
1416
1417 addrconf_dad_stop(ifp, 1);
1418 }
1419
1420 /* Join to solicited addr multicast group. */
1421
1422 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1423 {
1424 struct in6_addr maddr;
1425
1426 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1427 return;
1428
1429 addrconf_addr_solict_mult(addr, &maddr);
1430 ipv6_dev_mc_inc(dev, &maddr);
1431 }
1432
1433 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1434 {
1435 struct in6_addr maddr;
1436
1437 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1438 return;
1439
1440 addrconf_addr_solict_mult(addr, &maddr);
1441 __ipv6_dev_mc_dec(idev, &maddr);
1442 }
1443
1444 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1445 {
1446 struct in6_addr addr;
1447 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1448 if (ipv6_addr_any(&addr))
1449 return;
1450 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1451 }
1452
1453 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1454 {
1455 struct in6_addr addr;
1456 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1457 if (ipv6_addr_any(&addr))
1458 return;
1459 __ipv6_dev_ac_dec(ifp->idev, &addr);
1460 }
1461
1462 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1463 {
1464 if (dev->addr_len != ETH_ALEN)
1465 return -1;
1466 memcpy(eui, dev->dev_addr, 3);
1467 memcpy(eui + 5, dev->dev_addr + 3, 3);
1468
1469 /*
1470 * The zSeries OSA network cards can be shared among various
1471 * OS instances, but the OSA cards have only one MAC address.
1472 * This leads to duplicate address conflicts in conjunction
1473 * with IPv6 if more than one instance uses the same card.
1474 *
1475 * The driver for these cards can deliver a unique 16-bit
1476 * identifier for each instance sharing the same card. It is
1477 * placed instead of 0xFFFE in the interface identifier. The
1478 * "u" bit of the interface identifier is not inverted in this
1479 * case. Hence the resulting interface identifier has local
1480 * scope according to RFC2373.
1481 */
1482 if (dev->dev_id) {
1483 eui[3] = (dev->dev_id >> 8) & 0xFF;
1484 eui[4] = dev->dev_id & 0xFF;
1485 } else {
1486 eui[3] = 0xFF;
1487 eui[4] = 0xFE;
1488 eui[0] ^= 2;
1489 }
1490 return 0;
1491 }
1492
1493 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1494 {
1495 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1496 if (dev->addr_len != ARCNET_ALEN)
1497 return -1;
1498 memset(eui, 0, 7);
1499 eui[7] = *(u8*)dev->dev_addr;
1500 return 0;
1501 }
1502
1503 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1504 {
1505 if (dev->addr_len != INFINIBAND_ALEN)
1506 return -1;
1507 memcpy(eui, dev->dev_addr + 12, 8);
1508 eui[0] |= 2;
1509 return 0;
1510 }
1511
1512 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1513 {
1514 if (addr == 0)
1515 return -1;
1516 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1517 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1518 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1519 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1520 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1521 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1522 eui[1] = 0;
1523 eui[2] = 0x5E;
1524 eui[3] = 0xFE;
1525 memcpy(eui + 4, &addr, 4);
1526 return 0;
1527 }
1528 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1529
1530 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1531 {
1532 if (dev->priv_flags & IFF_ISATAP)
1533 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1534 return -1;
1535 }
1536
1537 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1538 {
1539 switch (dev->type) {
1540 case ARPHRD_ETHER:
1541 case ARPHRD_FDDI:
1542 case ARPHRD_IEEE802_TR:
1543 return addrconf_ifid_eui48(eui, dev);
1544 case ARPHRD_ARCNET:
1545 return addrconf_ifid_arcnet(eui, dev);
1546 case ARPHRD_INFINIBAND:
1547 return addrconf_ifid_infiniband(eui, dev);
1548 case ARPHRD_SIT:
1549 return addrconf_ifid_sit(eui, dev);
1550 }
1551 return -1;
1552 }
1553
1554 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1555 {
1556 int err = -1;
1557 struct inet6_ifaddr *ifp;
1558
1559 read_lock_bh(&idev->lock);
1560 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1561 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1562 memcpy(eui, ifp->addr.s6_addr+8, 8);
1563 err = 0;
1564 break;
1565 }
1566 }
1567 read_unlock_bh(&idev->lock);
1568 return err;
1569 }
1570
1571 #ifdef CONFIG_IPV6_PRIVACY
1572 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1573 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1574 {
1575 regen:
1576 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1577 idev->rndid[0] &= ~0x02;
1578
1579 /*
1580 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1581 * check if generated address is not inappropriate
1582 *
1583 * - Reserved subnet anycast (RFC 2526)
1584 * 11111101 11....11 1xxxxxxx
1585 * - ISATAP (RFC4214) 6.1
1586 * 00-00-5E-FE-xx-xx-xx-xx
1587 * - value 0
1588 * - XXX: already assigned to an address on the device
1589 */
1590 if (idev->rndid[0] == 0xfd &&
1591 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1592 (idev->rndid[7]&0x80))
1593 goto regen;
1594 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1595 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1596 goto regen;
1597 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1598 goto regen;
1599 }
1600
1601 return 0;
1602 }
1603
1604 static void ipv6_regen_rndid(unsigned long data)
1605 {
1606 struct inet6_dev *idev = (struct inet6_dev *) data;
1607 unsigned long expires;
1608
1609 rcu_read_lock_bh();
1610 write_lock_bh(&idev->lock);
1611
1612 if (idev->dead)
1613 goto out;
1614
1615 if (__ipv6_regen_rndid(idev) < 0)
1616 goto out;
1617
1618 expires = jiffies +
1619 idev->cnf.temp_prefered_lft * HZ -
1620 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1621 if (time_before(expires, jiffies)) {
1622 printk(KERN_WARNING
1623 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1624 idev->dev->name);
1625 goto out;
1626 }
1627
1628 if (!mod_timer(&idev->regen_timer, expires))
1629 in6_dev_hold(idev);
1630
1631 out:
1632 write_unlock_bh(&idev->lock);
1633 rcu_read_unlock_bh();
1634 in6_dev_put(idev);
1635 }
1636
1637 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1638 int ret = 0;
1639
1640 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1641 ret = __ipv6_regen_rndid(idev);
1642 return ret;
1643 }
1644 #endif
1645
1646 /*
1647 * Add prefix route.
1648 */
1649
1650 static void
1651 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1652 unsigned long expires, u32 flags)
1653 {
1654 struct fib6_config cfg = {
1655 .fc_table = RT6_TABLE_PREFIX,
1656 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1657 .fc_ifindex = dev->ifindex,
1658 .fc_expires = expires,
1659 .fc_dst_len = plen,
1660 .fc_flags = RTF_UP | flags,
1661 .fc_nlinfo.nl_net = dev_net(dev),
1662 .fc_protocol = RTPROT_KERNEL,
1663 };
1664
1665 ipv6_addr_copy(&cfg.fc_dst, pfx);
1666
1667 /* Prevent useless cloning on PtP SIT.
1668 This thing is done here expecting that the whole
1669 class of non-broadcast devices need not cloning.
1670 */
1671 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1672 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1673 cfg.fc_flags |= RTF_NONEXTHOP;
1674 #endif
1675
1676 ip6_route_add(&cfg);
1677 }
1678
1679 /* Create "default" multicast route to the interface */
1680
1681 static void addrconf_add_mroute(struct net_device *dev)
1682 {
1683 struct fib6_config cfg = {
1684 .fc_table = RT6_TABLE_LOCAL,
1685 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1686 .fc_ifindex = dev->ifindex,
1687 .fc_dst_len = 8,
1688 .fc_flags = RTF_UP,
1689 .fc_nlinfo.nl_net = dev_net(dev),
1690 };
1691
1692 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1693
1694 ip6_route_add(&cfg);
1695 }
1696
1697 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1698 static void sit_route_add(struct net_device *dev)
1699 {
1700 struct fib6_config cfg = {
1701 .fc_table = RT6_TABLE_MAIN,
1702 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1703 .fc_ifindex = dev->ifindex,
1704 .fc_dst_len = 96,
1705 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1706 .fc_nlinfo.nl_net = dev_net(dev),
1707 };
1708
1709 /* prefix length - 96 bits "::d.d.d.d" */
1710 ip6_route_add(&cfg);
1711 }
1712 #endif
1713
1714 static void addrconf_add_lroute(struct net_device *dev)
1715 {
1716 struct in6_addr addr;
1717
1718 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1719 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1720 }
1721
1722 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1723 {
1724 struct inet6_dev *idev;
1725
1726 ASSERT_RTNL();
1727
1728 if ((idev = ipv6_find_idev(dev)) == NULL)
1729 return NULL;
1730
1731 /* Add default multicast route */
1732 addrconf_add_mroute(dev);
1733
1734 /* Add link local route */
1735 addrconf_add_lroute(dev);
1736 return idev;
1737 }
1738
1739 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1740 {
1741 struct prefix_info *pinfo;
1742 __u32 valid_lft;
1743 __u32 prefered_lft;
1744 int addr_type;
1745 struct inet6_dev *in6_dev;
1746 struct net *net = dev_net(dev);
1747
1748 pinfo = (struct prefix_info *) opt;
1749
1750 if (len < sizeof(struct prefix_info)) {
1751 ADBG(("addrconf: prefix option too short\n"));
1752 return;
1753 }
1754
1755 /*
1756 * Validation checks ([ADDRCONF], page 19)
1757 */
1758
1759 addr_type = ipv6_addr_type(&pinfo->prefix);
1760
1761 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1762 return;
1763
1764 valid_lft = ntohl(pinfo->valid);
1765 prefered_lft = ntohl(pinfo->prefered);
1766
1767 if (prefered_lft > valid_lft) {
1768 if (net_ratelimit())
1769 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1770 return;
1771 }
1772
1773 in6_dev = in6_dev_get(dev);
1774
1775 if (in6_dev == NULL) {
1776 if (net_ratelimit())
1777 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1778 return;
1779 }
1780
1781 /*
1782 * Two things going on here:
1783 * 1) Add routes for on-link prefixes
1784 * 2) Configure prefixes with the auto flag set
1785 */
1786
1787 if (pinfo->onlink) {
1788 struct rt6_info *rt;
1789 unsigned long rt_expires;
1790
1791 /* Avoid arithmetic overflow. Really, we could
1792 * save rt_expires in seconds, likely valid_lft,
1793 * but it would require division in fib gc, that it
1794 * not good.
1795 */
1796 if (HZ > USER_HZ)
1797 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1798 else
1799 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1800
1801 if (addrconf_finite_timeout(rt_expires))
1802 rt_expires *= HZ;
1803
1804 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1805 dev->ifindex, 1);
1806
1807 if (rt && addrconf_is_prefix_route(rt)) {
1808 /* Autoconf prefix route */
1809 if (valid_lft == 0) {
1810 ip6_del_rt(rt);
1811 rt = NULL;
1812 } else if (addrconf_finite_timeout(rt_expires)) {
1813 /* not infinity */
1814 rt->rt6i_expires = jiffies + rt_expires;
1815 rt->rt6i_flags |= RTF_EXPIRES;
1816 } else {
1817 rt->rt6i_flags &= ~RTF_EXPIRES;
1818 rt->rt6i_expires = 0;
1819 }
1820 } else if (valid_lft) {
1821 clock_t expires = 0;
1822 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1823 if (addrconf_finite_timeout(rt_expires)) {
1824 /* not infinity */
1825 flags |= RTF_EXPIRES;
1826 expires = jiffies_to_clock_t(rt_expires);
1827 }
1828 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1829 dev, expires, flags);
1830 }
1831 if (rt)
1832 dst_release(&rt->u.dst);
1833 }
1834
1835 /* Try to figure out our local address for this prefix */
1836
1837 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1838 struct inet6_ifaddr * ifp;
1839 struct in6_addr addr;
1840 int create = 0, update_lft = 0;
1841
1842 if (pinfo->prefix_len == 64) {
1843 memcpy(&addr, &pinfo->prefix, 8);
1844 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1845 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1846 in6_dev_put(in6_dev);
1847 return;
1848 }
1849 goto ok;
1850 }
1851 if (net_ratelimit())
1852 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1853 pinfo->prefix_len);
1854 in6_dev_put(in6_dev);
1855 return;
1856
1857 ok:
1858
1859 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1860
1861 if (ifp == NULL && valid_lft) {
1862 int max_addresses = in6_dev->cnf.max_addresses;
1863 u32 addr_flags = 0;
1864
1865 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1866 if (in6_dev->cnf.optimistic_dad &&
1867 !net->ipv6.devconf_all->forwarding)
1868 addr_flags = IFA_F_OPTIMISTIC;
1869 #endif
1870
1871 /* Do not allow to create too much of autoconfigured
1872 * addresses; this would be too easy way to crash kernel.
1873 */
1874 if (!max_addresses ||
1875 ipv6_count_addresses(in6_dev) < max_addresses)
1876 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1877 addr_type&IPV6_ADDR_SCOPE_MASK,
1878 addr_flags);
1879
1880 if (!ifp || IS_ERR(ifp)) {
1881 in6_dev_put(in6_dev);
1882 return;
1883 }
1884
1885 update_lft = create = 1;
1886 ifp->cstamp = jiffies;
1887 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1888 }
1889
1890 if (ifp) {
1891 int flags;
1892 unsigned long now;
1893 #ifdef CONFIG_IPV6_PRIVACY
1894 struct inet6_ifaddr *ift;
1895 #endif
1896 u32 stored_lft;
1897
1898 /* update lifetime (RFC2462 5.5.3 e) */
1899 spin_lock(&ifp->lock);
1900 now = jiffies;
1901 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1902 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1903 else
1904 stored_lft = 0;
1905 if (!update_lft && stored_lft) {
1906 if (valid_lft > MIN_VALID_LIFETIME ||
1907 valid_lft > stored_lft)
1908 update_lft = 1;
1909 else if (stored_lft <= MIN_VALID_LIFETIME) {
1910 /* valid_lft <= stored_lft is always true */
1911 /*
1912 * RFC 4862 Section 5.5.3e:
1913 * "Note that the preferred lifetime of
1914 * the corresponding address is always
1915 * reset to the Preferred Lifetime in
1916 * the received Prefix Information
1917 * option, regardless of whether the
1918 * valid lifetime is also reset or
1919 * ignored."
1920 *
1921 * So if the preferred lifetime in
1922 * this advertisement is different
1923 * than what we have stored, but the
1924 * valid lifetime is invalid, just
1925 * reset prefered_lft.
1926 *
1927 * We must set the valid lifetime
1928 * to the stored lifetime since we'll
1929 * be updating the timestamp below,
1930 * else we'll set it back to the
1931 * minumum.
1932 */
1933 if (prefered_lft != ifp->prefered_lft) {
1934 valid_lft = stored_lft;
1935 update_lft = 1;
1936 }
1937 } else {
1938 valid_lft = MIN_VALID_LIFETIME;
1939 if (valid_lft < prefered_lft)
1940 prefered_lft = valid_lft;
1941 update_lft = 1;
1942 }
1943 }
1944
1945 if (update_lft) {
1946 ifp->valid_lft = valid_lft;
1947 ifp->prefered_lft = prefered_lft;
1948 ifp->tstamp = now;
1949 flags = ifp->flags;
1950 ifp->flags &= ~IFA_F_DEPRECATED;
1951 spin_unlock(&ifp->lock);
1952
1953 if (!(flags&IFA_F_TENTATIVE))
1954 ipv6_ifa_notify(0, ifp);
1955 } else
1956 spin_unlock(&ifp->lock);
1957
1958 #ifdef CONFIG_IPV6_PRIVACY
1959 read_lock_bh(&in6_dev->lock);
1960 /* update all temporary addresses in the list */
1961 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1962 /*
1963 * When adjusting the lifetimes of an existing
1964 * temporary address, only lower the lifetimes.
1965 * Implementations must not increase the
1966 * lifetimes of an existing temporary address
1967 * when processing a Prefix Information Option.
1968 */
1969 if (ifp != ift->ifpub)
1970 continue;
1971
1972 spin_lock(&ift->lock);
1973 flags = ift->flags;
1974 if (ift->valid_lft > valid_lft &&
1975 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1976 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1977 if (ift->prefered_lft > prefered_lft &&
1978 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1979 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1980 spin_unlock(&ift->lock);
1981 if (!(flags&IFA_F_TENTATIVE))
1982 ipv6_ifa_notify(0, ift);
1983 }
1984
1985 if (create && in6_dev->cnf.use_tempaddr > 0) {
1986 /*
1987 * When a new public address is created as described in [ADDRCONF],
1988 * also create a new temporary address.
1989 */
1990 read_unlock_bh(&in6_dev->lock);
1991 ipv6_create_tempaddr(ifp, NULL);
1992 } else {
1993 read_unlock_bh(&in6_dev->lock);
1994 }
1995 #endif
1996 in6_ifa_put(ifp);
1997 addrconf_verify(0);
1998 }
1999 }
2000 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2001 in6_dev_put(in6_dev);
2002 }
2003
2004 /*
2005 * Set destination address.
2006 * Special case for SIT interfaces where we create a new "virtual"
2007 * device.
2008 */
2009 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2010 {
2011 struct in6_ifreq ireq;
2012 struct net_device *dev;
2013 int err = -EINVAL;
2014
2015 rtnl_lock();
2016
2017 err = -EFAULT;
2018 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2019 goto err_exit;
2020
2021 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2022
2023 err = -ENODEV;
2024 if (dev == NULL)
2025 goto err_exit;
2026
2027 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2028 if (dev->type == ARPHRD_SIT) {
2029 const struct net_device_ops *ops = dev->netdev_ops;
2030 struct ifreq ifr;
2031 struct ip_tunnel_parm p;
2032
2033 err = -EADDRNOTAVAIL;
2034 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2035 goto err_exit;
2036
2037 memset(&p, 0, sizeof(p));
2038 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2039 p.iph.saddr = 0;
2040 p.iph.version = 4;
2041 p.iph.ihl = 5;
2042 p.iph.protocol = IPPROTO_IPV6;
2043 p.iph.ttl = 64;
2044 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2045
2046 if (ops->ndo_do_ioctl) {
2047 mm_segment_t oldfs = get_fs();
2048
2049 set_fs(KERNEL_DS);
2050 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2051 set_fs(oldfs);
2052 } else
2053 err = -EOPNOTSUPP;
2054
2055 if (err == 0) {
2056 err = -ENOBUFS;
2057 dev = __dev_get_by_name(net, p.name);
2058 if (!dev)
2059 goto err_exit;
2060 err = dev_open(dev);
2061 }
2062 }
2063 #endif
2064
2065 err_exit:
2066 rtnl_unlock();
2067 return err;
2068 }
2069
2070 /*
2071 * Manual configuration of address on an interface
2072 */
2073 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2074 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2075 __u32 valid_lft)
2076 {
2077 struct inet6_ifaddr *ifp;
2078 struct inet6_dev *idev;
2079 struct net_device *dev;
2080 int scope;
2081 u32 flags;
2082 clock_t expires;
2083 unsigned long timeout;
2084
2085 ASSERT_RTNL();
2086
2087 if (plen > 128)
2088 return -EINVAL;
2089
2090 /* check the lifetime */
2091 if (!valid_lft || prefered_lft > valid_lft)
2092 return -EINVAL;
2093
2094 dev = __dev_get_by_index(net, ifindex);
2095 if (!dev)
2096 return -ENODEV;
2097
2098 if ((idev = addrconf_add_dev(dev)) == NULL)
2099 return -ENOBUFS;
2100
2101 scope = ipv6_addr_scope(pfx);
2102
2103 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2104 if (addrconf_finite_timeout(timeout)) {
2105 expires = jiffies_to_clock_t(timeout * HZ);
2106 valid_lft = timeout;
2107 flags = RTF_EXPIRES;
2108 } else {
2109 expires = 0;
2110 flags = 0;
2111 ifa_flags |= IFA_F_PERMANENT;
2112 }
2113
2114 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2115 if (addrconf_finite_timeout(timeout)) {
2116 if (timeout == 0)
2117 ifa_flags |= IFA_F_DEPRECATED;
2118 prefered_lft = timeout;
2119 }
2120
2121 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2122
2123 if (!IS_ERR(ifp)) {
2124 spin_lock_bh(&ifp->lock);
2125 ifp->valid_lft = valid_lft;
2126 ifp->prefered_lft = prefered_lft;
2127 ifp->tstamp = jiffies;
2128 spin_unlock_bh(&ifp->lock);
2129
2130 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2131 expires, flags);
2132 /*
2133 * Note that section 3.1 of RFC 4429 indicates
2134 * that the Optimistic flag should not be set for
2135 * manually configured addresses
2136 */
2137 addrconf_dad_start(ifp, 0);
2138 in6_ifa_put(ifp);
2139 addrconf_verify(0);
2140 return 0;
2141 }
2142
2143 return PTR_ERR(ifp);
2144 }
2145
2146 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2147 unsigned int plen)
2148 {
2149 struct inet6_ifaddr *ifp;
2150 struct inet6_dev *idev;
2151 struct net_device *dev;
2152
2153 if (plen > 128)
2154 return -EINVAL;
2155
2156 dev = __dev_get_by_index(net, ifindex);
2157 if (!dev)
2158 return -ENODEV;
2159
2160 if ((idev = __in6_dev_get(dev)) == NULL)
2161 return -ENXIO;
2162
2163 read_lock_bh(&idev->lock);
2164 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2165 if (ifp->prefix_len == plen &&
2166 ipv6_addr_equal(pfx, &ifp->addr)) {
2167 in6_ifa_hold(ifp);
2168 read_unlock_bh(&idev->lock);
2169
2170 ipv6_del_addr(ifp);
2171
2172 /* If the last address is deleted administratively,
2173 disable IPv6 on this interface.
2174 */
2175 if (list_empty(&idev->addr_list))
2176 addrconf_ifdown(idev->dev, 1);
2177 return 0;
2178 }
2179 }
2180 read_unlock_bh(&idev->lock);
2181 return -EADDRNOTAVAIL;
2182 }
2183
2184
2185 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2186 {
2187 struct in6_ifreq ireq;
2188 int err;
2189
2190 if (!capable(CAP_NET_ADMIN))
2191 return -EPERM;
2192
2193 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2194 return -EFAULT;
2195
2196 rtnl_lock();
2197 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2198 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2199 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2200 rtnl_unlock();
2201 return err;
2202 }
2203
2204 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2205 {
2206 struct in6_ifreq ireq;
2207 int err;
2208
2209 if (!capable(CAP_NET_ADMIN))
2210 return -EPERM;
2211
2212 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2213 return -EFAULT;
2214
2215 rtnl_lock();
2216 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2217 ireq.ifr6_prefixlen);
2218 rtnl_unlock();
2219 return err;
2220 }
2221
2222 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2223 int plen, int scope)
2224 {
2225 struct inet6_ifaddr *ifp;
2226
2227 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2228 if (!IS_ERR(ifp)) {
2229 spin_lock_bh(&ifp->lock);
2230 ifp->flags &= ~IFA_F_TENTATIVE;
2231 spin_unlock_bh(&ifp->lock);
2232 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2233 in6_ifa_put(ifp);
2234 }
2235 }
2236
2237 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2238 static void sit_add_v4_addrs(struct inet6_dev *idev)
2239 {
2240 struct in6_addr addr;
2241 struct net_device *dev;
2242 struct net *net = dev_net(idev->dev);
2243 int scope;
2244
2245 ASSERT_RTNL();
2246
2247 memset(&addr, 0, sizeof(struct in6_addr));
2248 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2249
2250 if (idev->dev->flags&IFF_POINTOPOINT) {
2251 addr.s6_addr32[0] = htonl(0xfe800000);
2252 scope = IFA_LINK;
2253 } else {
2254 scope = IPV6_ADDR_COMPATv4;
2255 }
2256
2257 if (addr.s6_addr32[3]) {
2258 add_addr(idev, &addr, 128, scope);
2259 return;
2260 }
2261
2262 for_each_netdev(net, dev) {
2263 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2264 if (in_dev && (dev->flags & IFF_UP)) {
2265 struct in_ifaddr * ifa;
2266
2267 int flag = scope;
2268
2269 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2270 int plen;
2271
2272 addr.s6_addr32[3] = ifa->ifa_local;
2273
2274 if (ifa->ifa_scope == RT_SCOPE_LINK)
2275 continue;
2276 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2277 if (idev->dev->flags&IFF_POINTOPOINT)
2278 continue;
2279 flag |= IFA_HOST;
2280 }
2281 if (idev->dev->flags&IFF_POINTOPOINT)
2282 plen = 64;
2283 else
2284 plen = 96;
2285
2286 add_addr(idev, &addr, plen, flag);
2287 }
2288 }
2289 }
2290 }
2291 #endif
2292
2293 static void init_loopback(struct net_device *dev)
2294 {
2295 struct inet6_dev *idev;
2296
2297 /* ::1 */
2298
2299 ASSERT_RTNL();
2300
2301 if ((idev = ipv6_find_idev(dev)) == NULL) {
2302 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2303 return;
2304 }
2305
2306 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2307 }
2308
2309 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2310 {
2311 struct inet6_ifaddr * ifp;
2312 u32 addr_flags = IFA_F_PERMANENT;
2313
2314 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2315 if (idev->cnf.optimistic_dad &&
2316 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2317 addr_flags |= IFA_F_OPTIMISTIC;
2318 #endif
2319
2320
2321 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2322 if (!IS_ERR(ifp)) {
2323 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2324 addrconf_dad_start(ifp, 0);
2325 in6_ifa_put(ifp);
2326 }
2327 }
2328
2329 static void addrconf_dev_config(struct net_device *dev)
2330 {
2331 struct in6_addr addr;
2332 struct inet6_dev * idev;
2333
2334 ASSERT_RTNL();
2335
2336 if ((dev->type != ARPHRD_ETHER) &&
2337 (dev->type != ARPHRD_FDDI) &&
2338 (dev->type != ARPHRD_IEEE802_TR) &&
2339 (dev->type != ARPHRD_ARCNET) &&
2340 (dev->type != ARPHRD_INFINIBAND)) {
2341 /* Alas, we support only Ethernet autoconfiguration. */
2342 return;
2343 }
2344
2345 idev = addrconf_add_dev(dev);
2346 if (idev == NULL)
2347 return;
2348
2349 memset(&addr, 0, sizeof(struct in6_addr));
2350 addr.s6_addr32[0] = htonl(0xFE800000);
2351
2352 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2353 addrconf_add_linklocal(idev, &addr);
2354 }
2355
2356 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2357 static void addrconf_sit_config(struct net_device *dev)
2358 {
2359 struct inet6_dev *idev;
2360
2361 ASSERT_RTNL();
2362
2363 /*
2364 * Configure the tunnel with one of our IPv4
2365 * addresses... we should configure all of
2366 * our v4 addrs in the tunnel
2367 */
2368
2369 if ((idev = ipv6_find_idev(dev)) == NULL) {
2370 printk(KERN_DEBUG "init sit: add_dev failed\n");
2371 return;
2372 }
2373
2374 if (dev->priv_flags & IFF_ISATAP) {
2375 struct in6_addr addr;
2376
2377 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2378 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2379 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2380 addrconf_add_linklocal(idev, &addr);
2381 return;
2382 }
2383
2384 sit_add_v4_addrs(idev);
2385
2386 if (dev->flags&IFF_POINTOPOINT) {
2387 addrconf_add_mroute(dev);
2388 addrconf_add_lroute(dev);
2389 } else
2390 sit_route_add(dev);
2391 }
2392 #endif
2393
2394 static inline int
2395 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2396 {
2397 struct in6_addr lladdr;
2398
2399 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2400 addrconf_add_linklocal(idev, &lladdr);
2401 return 0;
2402 }
2403 return -1;
2404 }
2405
2406 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2407 {
2408 struct net_device *link_dev;
2409 struct net *net = dev_net(idev->dev);
2410
2411 /* first try to inherit the link-local address from the link device */
2412 if (idev->dev->iflink &&
2413 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2414 if (!ipv6_inherit_linklocal(idev, link_dev))
2415 return;
2416 }
2417 /* then try to inherit it from any device */
2418 for_each_netdev(net, link_dev) {
2419 if (!ipv6_inherit_linklocal(idev, link_dev))
2420 return;
2421 }
2422 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2423 }
2424
2425 /*
2426 * Autoconfigure tunnel with a link-local address so routing protocols,
2427 * DHCPv6, MLD etc. can be run over the virtual link
2428 */
2429
2430 static void addrconf_ip6_tnl_config(struct net_device *dev)
2431 {
2432 struct inet6_dev *idev;
2433
2434 ASSERT_RTNL();
2435
2436 if ((idev = addrconf_add_dev(dev)) == NULL) {
2437 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2438 return;
2439 }
2440 ip6_tnl_add_linklocal(idev);
2441 }
2442
2443 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2444 void * data)
2445 {
2446 struct net_device *dev = (struct net_device *) data;
2447 struct inet6_dev *idev = __in6_dev_get(dev);
2448 int run_pending = 0;
2449 int err;
2450
2451 switch(event) {
2452 case NETDEV_REGISTER:
2453 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2454 idev = ipv6_add_dev(dev);
2455 if (!idev)
2456 return notifier_from_errno(-ENOMEM);
2457 }
2458 break;
2459
2460 case NETDEV_UP:
2461 case NETDEV_CHANGE:
2462 if (dev->flags & IFF_SLAVE)
2463 break;
2464
2465 if (event == NETDEV_UP) {
2466 if (!addrconf_qdisc_ok(dev)) {
2467 /* device is not ready yet. */
2468 printk(KERN_INFO
2469 "ADDRCONF(NETDEV_UP): %s: "
2470 "link is not ready\n",
2471 dev->name);
2472 break;
2473 }
2474
2475 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2476 idev = ipv6_add_dev(dev);
2477
2478 if (idev) {
2479 idev->if_flags |= IF_READY;
2480 run_pending = 1;
2481 }
2482 } else {
2483 if (!addrconf_qdisc_ok(dev)) {
2484 /* device is still not ready. */
2485 break;
2486 }
2487
2488 if (idev) {
2489 if (idev->if_flags & IF_READY)
2490 /* device is already configured. */
2491 break;
2492 idev->if_flags |= IF_READY;
2493 }
2494
2495 printk(KERN_INFO
2496 "ADDRCONF(NETDEV_CHANGE): %s: "
2497 "link becomes ready\n",
2498 dev->name);
2499
2500 run_pending = 1;
2501 }
2502
2503 switch(dev->type) {
2504 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2505 case ARPHRD_SIT:
2506 addrconf_sit_config(dev);
2507 break;
2508 #endif
2509 case ARPHRD_TUNNEL6:
2510 addrconf_ip6_tnl_config(dev);
2511 break;
2512 case ARPHRD_LOOPBACK:
2513 init_loopback(dev);
2514 break;
2515
2516 default:
2517 addrconf_dev_config(dev);
2518 break;
2519 }
2520
2521 if (idev) {
2522 if (run_pending)
2523 addrconf_dad_run(idev);
2524
2525 /*
2526 * If the MTU changed during the interface down,
2527 * when the interface up, the changed MTU must be
2528 * reflected in the idev as well as routers.
2529 */
2530 if (idev->cnf.mtu6 != dev->mtu &&
2531 dev->mtu >= IPV6_MIN_MTU) {
2532 rt6_mtu_change(dev, dev->mtu);
2533 idev->cnf.mtu6 = dev->mtu;
2534 }
2535 idev->tstamp = jiffies;
2536 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2537
2538 /*
2539 * If the changed mtu during down is lower than
2540 * IPV6_MIN_MTU stop IPv6 on this interface.
2541 */
2542 if (dev->mtu < IPV6_MIN_MTU)
2543 addrconf_ifdown(dev, 1);
2544 }
2545 break;
2546
2547 case NETDEV_CHANGEMTU:
2548 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2549 rt6_mtu_change(dev, dev->mtu);
2550 idev->cnf.mtu6 = dev->mtu;
2551 break;
2552 }
2553
2554 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2555 idev = ipv6_add_dev(dev);
2556 if (idev)
2557 break;
2558 }
2559
2560 /*
2561 * MTU falled under IPV6_MIN_MTU.
2562 * Stop IPv6 on this interface.
2563 */
2564
2565 case NETDEV_DOWN:
2566 case NETDEV_UNREGISTER:
2567 /*
2568 * Remove all addresses from this interface.
2569 */
2570 addrconf_ifdown(dev, event != NETDEV_DOWN);
2571 break;
2572
2573 case NETDEV_CHANGENAME:
2574 if (idev) {
2575 snmp6_unregister_dev(idev);
2576 addrconf_sysctl_unregister(idev);
2577 addrconf_sysctl_register(idev);
2578 err = snmp6_register_dev(idev);
2579 if (err)
2580 return notifier_from_errno(err);
2581 }
2582 break;
2583
2584 case NETDEV_PRE_TYPE_CHANGE:
2585 case NETDEV_POST_TYPE_CHANGE:
2586 addrconf_type_change(dev, event);
2587 break;
2588 }
2589
2590 return NOTIFY_OK;
2591 }
2592
2593 /*
2594 * addrconf module should be notified of a device going up
2595 */
2596 static struct notifier_block ipv6_dev_notf = {
2597 .notifier_call = addrconf_notify,
2598 };
2599
2600 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2601 {
2602 struct inet6_dev *idev;
2603 ASSERT_RTNL();
2604
2605 idev = __in6_dev_get(dev);
2606
2607 if (event == NETDEV_POST_TYPE_CHANGE)
2608 ipv6_mc_remap(idev);
2609 else if (event == NETDEV_PRE_TYPE_CHANGE)
2610 ipv6_mc_unmap(idev);
2611 }
2612
2613 static int addrconf_ifdown(struct net_device *dev, int how)
2614 {
2615 struct net *net = dev_net(dev);
2616 struct inet6_dev *idev;
2617 struct inet6_ifaddr *ifa;
2618 LIST_HEAD(keep_list);
2619
2620 ASSERT_RTNL();
2621
2622 rt6_ifdown(net, dev);
2623 neigh_ifdown(&nd_tbl, dev);
2624
2625 idev = __in6_dev_get(dev);
2626 if (idev == NULL)
2627 return -ENODEV;
2628
2629 /*
2630 * Step 1: remove reference to ipv6 device from parent device.
2631 * Do not dev_put!
2632 */
2633 if (how) {
2634 idev->dead = 1;
2635
2636 /* protected by rtnl_lock */
2637 rcu_assign_pointer(dev->ip6_ptr, NULL);
2638
2639 /* Step 1.5: remove snmp6 entry */
2640 snmp6_unregister_dev(idev);
2641
2642 }
2643
2644 write_lock_bh(&idev->lock);
2645
2646 /* Step 2: clear flags for stateless addrconf */
2647 if (!how)
2648 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2649
2650 #ifdef CONFIG_IPV6_PRIVACY
2651 if (how && del_timer(&idev->regen_timer))
2652 in6_dev_put(idev);
2653
2654 /* Step 3: clear tempaddr list */
2655 while (!list_empty(&idev->tempaddr_list)) {
2656 ifa = list_first_entry(&idev->tempaddr_list,
2657 struct inet6_ifaddr, tmp_list);
2658 list_del(&ifa->tmp_list);
2659 ifa->dead = 1;
2660 write_unlock_bh(&idev->lock);
2661 spin_lock_bh(&ifa->lock);
2662
2663 if (ifa->ifpub) {
2664 in6_ifa_put(ifa->ifpub);
2665 ifa->ifpub = NULL;
2666 }
2667 spin_unlock_bh(&ifa->lock);
2668 in6_ifa_put(ifa);
2669 write_lock_bh(&idev->lock);
2670 }
2671 #endif
2672
2673 while (!list_empty(&idev->addr_list)) {
2674 ifa = list_first_entry(&idev->addr_list,
2675 struct inet6_ifaddr, if_list);
2676 addrconf_del_timer(ifa);
2677
2678 /* If just doing link down, and address is permanent
2679 and not link-local, then retain it. */
2680 if (!how &&
2681 (ifa->flags&IFA_F_PERMANENT) &&
2682 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
2683 list_move_tail(&ifa->if_list, &keep_list);
2684
2685 /* If not doing DAD on this address, just keep it. */
2686 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2687 idev->cnf.accept_dad <= 0 ||
2688 (ifa->flags & IFA_F_NODAD))
2689 continue;
2690
2691 /* If it was tentative already, no need to notify */
2692 if (ifa->flags & IFA_F_TENTATIVE)
2693 continue;
2694
2695 /* Flag it for later restoration when link comes up */
2696 ifa->flags |= IFA_F_TENTATIVE;
2697 in6_ifa_hold(ifa);
2698 } else {
2699 list_del(&ifa->if_list);
2700 ifa->dead = 1;
2701 }
2702 write_unlock_bh(&idev->lock);
2703
2704 /* clear hash table */
2705 spin_lock_bh(&addrconf_hash_lock);
2706 hlist_del_init_rcu(&ifa->addr_lst);
2707 __in6_ifa_put(ifa);
2708 spin_unlock_bh(&addrconf_hash_lock);
2709
2710 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2711 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2712 in6_ifa_put(ifa);
2713
2714 write_lock_bh(&idev->lock);
2715 }
2716
2717 list_splice(&keep_list, &idev->addr_list);
2718
2719 write_unlock_bh(&idev->lock);
2720
2721 /* Step 5: Discard multicast list */
2722 if (how)
2723 ipv6_mc_destroy_dev(idev);
2724 else
2725 ipv6_mc_down(idev);
2726
2727 idev->tstamp = jiffies;
2728
2729 /* Last: Shot the device (if unregistered) */
2730 if (how) {
2731 addrconf_sysctl_unregister(idev);
2732 neigh_parms_release(&nd_tbl, idev->nd_parms);
2733 neigh_ifdown(&nd_tbl, dev);
2734 in6_dev_put(idev);
2735 }
2736 return 0;
2737 }
2738
2739 static void addrconf_rs_timer(unsigned long data)
2740 {
2741 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2742 struct inet6_dev *idev = ifp->idev;
2743
2744 read_lock(&idev->lock);
2745 if (idev->dead || !(idev->if_flags & IF_READY))
2746 goto out;
2747
2748 if (idev->cnf.forwarding)
2749 goto out;
2750
2751 /* Announcement received after solicitation was sent */
2752 if (idev->if_flags & IF_RA_RCVD)
2753 goto out;
2754
2755 spin_lock(&ifp->lock);
2756 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2757 /* The wait after the last probe can be shorter */
2758 addrconf_mod_timer(ifp, AC_RS,
2759 (ifp->probes == idev->cnf.rtr_solicits) ?
2760 idev->cnf.rtr_solicit_delay :
2761 idev->cnf.rtr_solicit_interval);
2762 spin_unlock(&ifp->lock);
2763
2764 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2765 } else {
2766 spin_unlock(&ifp->lock);
2767 /*
2768 * Note: we do not support deprecated "all on-link"
2769 * assumption any longer.
2770 */
2771 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2772 idev->dev->name);
2773 }
2774
2775 out:
2776 read_unlock(&idev->lock);
2777 in6_ifa_put(ifp);
2778 }
2779
2780 /*
2781 * Duplicate Address Detection
2782 */
2783 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2784 {
2785 unsigned long rand_num;
2786 struct inet6_dev *idev = ifp->idev;
2787
2788 if (ifp->flags & IFA_F_OPTIMISTIC)
2789 rand_num = 0;
2790 else
2791 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2792
2793 ifp->probes = idev->cnf.dad_transmits;
2794 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2795 }
2796
2797 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2798 {
2799 struct inet6_dev *idev = ifp->idev;
2800 struct net_device *dev = idev->dev;
2801
2802 addrconf_join_solict(dev, &ifp->addr);
2803
2804 net_srandom(ifp->addr.s6_addr32[3]);
2805
2806 read_lock_bh(&idev->lock);
2807 if (ifp->dead)
2808 goto out;
2809
2810 spin_lock(&ifp->lock);
2811 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2812 idev->cnf.accept_dad < 1 ||
2813 !(ifp->flags&IFA_F_TENTATIVE) ||
2814 ifp->flags & IFA_F_NODAD) {
2815 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2816 spin_unlock(&ifp->lock);
2817 read_unlock_bh(&idev->lock);
2818
2819 addrconf_dad_completed(ifp);
2820 return;
2821 }
2822
2823 if (!(idev->if_flags & IF_READY)) {
2824 spin_unlock(&ifp->lock);
2825 read_unlock_bh(&idev->lock);
2826 /*
2827 * If the device is not ready:
2828 * - keep it tentative if it is a permanent address.
2829 * - otherwise, kill it.
2830 */
2831 in6_ifa_hold(ifp);
2832 addrconf_dad_stop(ifp, 0);
2833 return;
2834 }
2835
2836 /*
2837 * Optimistic nodes can start receiving
2838 * Frames right away
2839 */
2840 if(ifp->flags & IFA_F_OPTIMISTIC)
2841 ip6_ins_rt(ifp->rt);
2842
2843 addrconf_dad_kick(ifp);
2844 spin_unlock(&ifp->lock);
2845 out:
2846 read_unlock_bh(&idev->lock);
2847 }
2848
2849 static void addrconf_dad_timer(unsigned long data)
2850 {
2851 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2852 struct inet6_dev *idev = ifp->idev;
2853 struct in6_addr mcaddr;
2854
2855 read_lock(&idev->lock);
2856 if (idev->dead || !(idev->if_flags & IF_READY)) {
2857 read_unlock(&idev->lock);
2858 goto out;
2859 }
2860
2861 spin_lock(&ifp->lock);
2862 if (ifp->probes == 0) {
2863 /*
2864 * DAD was successful
2865 */
2866
2867 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2868 spin_unlock(&ifp->lock);
2869 read_unlock(&idev->lock);
2870
2871 addrconf_dad_completed(ifp);
2872
2873 goto out;
2874 }
2875
2876 ifp->probes--;
2877 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2878 spin_unlock(&ifp->lock);
2879 read_unlock(&idev->lock);
2880
2881 /* send a neighbour solicitation for our addr */
2882 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2883 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2884 out:
2885 in6_ifa_put(ifp);
2886 }
2887
2888 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2889 {
2890 struct net_device * dev = ifp->idev->dev;
2891
2892 /*
2893 * Configure the address for reception. Now it is valid.
2894 */
2895
2896 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2897
2898 /* If added prefix is link local and forwarding is off,
2899 start sending router solicitations.
2900 */
2901
2902 if (ifp->idev->cnf.forwarding == 0 &&
2903 ifp->idev->cnf.rtr_solicits > 0 &&
2904 (dev->flags&IFF_LOOPBACK) == 0 &&
2905 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2906 /*
2907 * If a host as already performed a random delay
2908 * [...] as part of DAD [...] there is no need
2909 * to delay again before sending the first RS
2910 */
2911 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2912
2913 spin_lock_bh(&ifp->lock);
2914 ifp->probes = 1;
2915 ifp->idev->if_flags |= IF_RS_SENT;
2916 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2917 spin_unlock_bh(&ifp->lock);
2918 }
2919 }
2920
2921 static void addrconf_dad_run(struct inet6_dev *idev) {
2922 struct inet6_ifaddr *ifp;
2923
2924 read_lock_bh(&idev->lock);
2925 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2926 spin_lock(&ifp->lock);
2927 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2928 spin_unlock(&ifp->lock);
2929 continue;
2930 }
2931 spin_unlock(&ifp->lock);
2932 addrconf_dad_kick(ifp);
2933 }
2934 read_unlock_bh(&idev->lock);
2935 }
2936
2937 #ifdef CONFIG_PROC_FS
2938 struct if6_iter_state {
2939 struct seq_net_private p;
2940 int bucket;
2941 };
2942
2943 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2944 {
2945 struct inet6_ifaddr *ifa = NULL;
2946 struct if6_iter_state *state = seq->private;
2947 struct net *net = seq_file_net(seq);
2948
2949 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2950 struct hlist_node *n;
2951 hlist_for_each_entry_rcu(ifa, n, &inet6_addr_lst[state->bucket],
2952 addr_lst)
2953 if (net_eq(dev_net(ifa->idev->dev), net))
2954 return ifa;
2955 }
2956 return NULL;
2957 }
2958
2959 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
2960 struct inet6_ifaddr *ifa)
2961 {
2962 struct if6_iter_state *state = seq->private;
2963 struct net *net = seq_file_net(seq);
2964 struct hlist_node *n = &ifa->addr_lst;
2965
2966 hlist_for_each_entry_continue_rcu(ifa, n, addr_lst)
2967 if (net_eq(dev_net(ifa->idev->dev), net))
2968 return ifa;
2969
2970 while (++state->bucket < IN6_ADDR_HSIZE) {
2971 hlist_for_each_entry(ifa, n,
2972 &inet6_addr_lst[state->bucket], addr_lst) {
2973 if (net_eq(dev_net(ifa->idev->dev), net))
2974 return ifa;
2975 }
2976 }
2977
2978 return NULL;
2979 }
2980
2981 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2982 {
2983 struct inet6_ifaddr *ifa = if6_get_first(seq);
2984
2985 if (ifa)
2986 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2987 --pos;
2988 return pos ? NULL : ifa;
2989 }
2990
2991 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2992 __acquires(rcu)
2993 {
2994 rcu_read_lock_bh();
2995 return if6_get_idx(seq, *pos);
2996 }
2997
2998 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2999 {
3000 struct inet6_ifaddr *ifa;
3001
3002 ifa = if6_get_next(seq, v);
3003 ++*pos;
3004 return ifa;
3005 }
3006
3007 static void if6_seq_stop(struct seq_file *seq, void *v)
3008 __releases(rcu)
3009 {
3010 rcu_read_unlock_bh();
3011 }
3012
3013 static int if6_seq_show(struct seq_file *seq, void *v)
3014 {
3015 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3016 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3017 &ifp->addr,
3018 ifp->idev->dev->ifindex,
3019 ifp->prefix_len,
3020 ifp->scope,
3021 ifp->flags,
3022 ifp->idev->dev->name);
3023 return 0;
3024 }
3025
3026 static const struct seq_operations if6_seq_ops = {
3027 .start = if6_seq_start,
3028 .next = if6_seq_next,
3029 .show = if6_seq_show,
3030 .stop = if6_seq_stop,
3031 };
3032
3033 static int if6_seq_open(struct inode *inode, struct file *file)
3034 {
3035 return seq_open_net(inode, file, &if6_seq_ops,
3036 sizeof(struct if6_iter_state));
3037 }
3038
3039 static const struct file_operations if6_fops = {
3040 .owner = THIS_MODULE,
3041 .open = if6_seq_open,
3042 .read = seq_read,
3043 .llseek = seq_lseek,
3044 .release = seq_release_net,
3045 };
3046
3047 static int __net_init if6_proc_net_init(struct net *net)
3048 {
3049 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3050 return -ENOMEM;
3051 return 0;
3052 }
3053
3054 static void __net_exit if6_proc_net_exit(struct net *net)
3055 {
3056 proc_net_remove(net, "if_inet6");
3057 }
3058
3059 static struct pernet_operations if6_proc_net_ops = {
3060 .init = if6_proc_net_init,
3061 .exit = if6_proc_net_exit,
3062 };
3063
3064 int __init if6_proc_init(void)
3065 {
3066 return register_pernet_subsys(&if6_proc_net_ops);
3067 }
3068
3069 void if6_proc_exit(void)
3070 {
3071 unregister_pernet_subsys(&if6_proc_net_ops);
3072 }
3073 #endif /* CONFIG_PROC_FS */
3074
3075 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3076 /* Check if address is a home address configured on any interface. */
3077 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3078 {
3079 int ret = 0;
3080 struct inet6_ifaddr *ifp = NULL;
3081 struct hlist_node *n;
3082 unsigned int hash = ipv6_addr_hash(addr);
3083
3084 rcu_read_lock_bh();
3085 hlist_for_each_entry_rcu(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3086 if (!net_eq(dev_net(ifp->idev->dev), net))
3087 continue;
3088 if (ipv6_addr_equal(&ifp->addr, addr) &&
3089 (ifp->flags & IFA_F_HOMEADDRESS)) {
3090 ret = 1;
3091 break;
3092 }
3093 }
3094 rcu_read_unlock_bh();
3095 return ret;
3096 }
3097 #endif
3098
3099 /*
3100 * Periodic address status verification
3101 */
3102
3103 static void addrconf_verify(unsigned long foo)
3104 {
3105 struct inet6_ifaddr *ifp;
3106 struct hlist_node *node;
3107 unsigned long now, next;
3108 int i;
3109
3110 rcu_read_lock_bh();
3111 spin_lock(&addrconf_verify_lock);
3112 now = jiffies;
3113 next = now + ADDR_CHECK_FREQUENCY;
3114
3115 del_timer(&addr_chk_timer);
3116
3117 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3118 restart:
3119 hlist_for_each_entry_rcu(ifp, node,
3120 &inet6_addr_lst[i], addr_lst) {
3121 unsigned long age;
3122 #ifdef CONFIG_IPV6_PRIVACY
3123 unsigned long regen_advance;
3124 #endif
3125
3126 if (ifp->flags & IFA_F_PERMANENT)
3127 continue;
3128
3129 spin_lock(&ifp->lock);
3130 age = (now - ifp->tstamp) / HZ;
3131
3132 #ifdef CONFIG_IPV6_PRIVACY
3133 regen_advance = ifp->idev->cnf.regen_max_retry *
3134 ifp->idev->cnf.dad_transmits *
3135 ifp->idev->nd_parms->retrans_time / HZ;
3136 #endif
3137
3138 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3139 age >= ifp->valid_lft) {
3140 spin_unlock(&ifp->lock);
3141 in6_ifa_hold(ifp);
3142 ipv6_del_addr(ifp);
3143 goto restart;
3144 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3145 spin_unlock(&ifp->lock);
3146 continue;
3147 } else if (age >= ifp->prefered_lft) {
3148 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3149 int deprecate = 0;
3150
3151 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3152 deprecate = 1;
3153 ifp->flags |= IFA_F_DEPRECATED;
3154 }
3155
3156 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3157 next = ifp->tstamp + ifp->valid_lft * HZ;
3158
3159 spin_unlock(&ifp->lock);
3160
3161 if (deprecate) {
3162 in6_ifa_hold(ifp);
3163
3164 ipv6_ifa_notify(0, ifp);
3165 in6_ifa_put(ifp);
3166 goto restart;
3167 }
3168 #ifdef CONFIG_IPV6_PRIVACY
3169 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3170 !(ifp->flags&IFA_F_TENTATIVE)) {
3171 if (age >= ifp->prefered_lft - regen_advance) {
3172 struct inet6_ifaddr *ifpub = ifp->ifpub;
3173 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3174 next = ifp->tstamp + ifp->prefered_lft * HZ;
3175 if (!ifp->regen_count && ifpub) {
3176 ifp->regen_count++;
3177 in6_ifa_hold(ifp);
3178 in6_ifa_hold(ifpub);
3179 spin_unlock(&ifp->lock);
3180
3181 spin_lock(&ifpub->lock);
3182 ifpub->regen_count = 0;
3183 spin_unlock(&ifpub->lock);
3184 ipv6_create_tempaddr(ifpub, ifp);
3185 in6_ifa_put(ifpub);
3186 in6_ifa_put(ifp);
3187 goto restart;
3188 }
3189 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3190 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3191 spin_unlock(&ifp->lock);
3192 #endif
3193 } else {
3194 /* ifp->prefered_lft <= ifp->valid_lft */
3195 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3196 next = ifp->tstamp + ifp->prefered_lft * HZ;
3197 spin_unlock(&ifp->lock);
3198 }
3199 }
3200 }
3201
3202 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3203 add_timer(&addr_chk_timer);
3204 spin_unlock(&addrconf_verify_lock);
3205 rcu_read_unlock_bh();
3206 }
3207
3208 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3209 {
3210 struct in6_addr *pfx = NULL;
3211
3212 if (addr)
3213 pfx = nla_data(addr);
3214
3215 if (local) {
3216 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3217 pfx = NULL;
3218 else
3219 pfx = nla_data(local);
3220 }
3221
3222 return pfx;
3223 }
3224
3225 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3226 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3227 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3228 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3229 };
3230
3231 static int
3232 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3233 {
3234 struct net *net = sock_net(skb->sk);
3235 struct ifaddrmsg *ifm;
3236 struct nlattr *tb[IFA_MAX+1];
3237 struct in6_addr *pfx;
3238 int err;
3239
3240 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3241 if (err < 0)
3242 return err;
3243
3244 ifm = nlmsg_data(nlh);
3245 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3246 if (pfx == NULL)
3247 return -EINVAL;
3248
3249 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3250 }
3251
3252 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3253 u32 prefered_lft, u32 valid_lft)
3254 {
3255 u32 flags;
3256 clock_t expires;
3257 unsigned long timeout;
3258
3259 if (!valid_lft || (prefered_lft > valid_lft))
3260 return -EINVAL;
3261
3262 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3263 if (addrconf_finite_timeout(timeout)) {
3264 expires = jiffies_to_clock_t(timeout * HZ);
3265 valid_lft = timeout;
3266 flags = RTF_EXPIRES;
3267 } else {
3268 expires = 0;
3269 flags = 0;
3270 ifa_flags |= IFA_F_PERMANENT;
3271 }
3272
3273 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3274 if (addrconf_finite_timeout(timeout)) {
3275 if (timeout == 0)
3276 ifa_flags |= IFA_F_DEPRECATED;
3277 prefered_lft = timeout;
3278 }
3279
3280 spin_lock_bh(&ifp->lock);
3281 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3282 ifp->tstamp = jiffies;
3283 ifp->valid_lft = valid_lft;
3284 ifp->prefered_lft = prefered_lft;
3285
3286 spin_unlock_bh(&ifp->lock);
3287 if (!(ifp->flags&IFA_F_TENTATIVE))
3288 ipv6_ifa_notify(0, ifp);
3289
3290 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3291 expires, flags);
3292 addrconf_verify(0);
3293
3294 return 0;
3295 }
3296
3297 static int
3298 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3299 {
3300 struct net *net = sock_net(skb->sk);
3301 struct ifaddrmsg *ifm;
3302 struct nlattr *tb[IFA_MAX+1];
3303 struct in6_addr *pfx;
3304 struct inet6_ifaddr *ifa;
3305 struct net_device *dev;
3306 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3307 u8 ifa_flags;
3308 int err;
3309
3310 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3311 if (err < 0)
3312 return err;
3313
3314 ifm = nlmsg_data(nlh);
3315 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3316 if (pfx == NULL)
3317 return -EINVAL;
3318
3319 if (tb[IFA_CACHEINFO]) {
3320 struct ifa_cacheinfo *ci;
3321
3322 ci = nla_data(tb[IFA_CACHEINFO]);
3323 valid_lft = ci->ifa_valid;
3324 preferred_lft = ci->ifa_prefered;
3325 } else {
3326 preferred_lft = INFINITY_LIFE_TIME;
3327 valid_lft = INFINITY_LIFE_TIME;
3328 }
3329
3330 dev = __dev_get_by_index(net, ifm->ifa_index);
3331 if (dev == NULL)
3332 return -ENODEV;
3333
3334 /* We ignore other flags so far. */
3335 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3336
3337 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3338 if (ifa == NULL) {
3339 /*
3340 * It would be best to check for !NLM_F_CREATE here but
3341 * userspace alreay relies on not having to provide this.
3342 */
3343 return inet6_addr_add(net, ifm->ifa_index, pfx,
3344 ifm->ifa_prefixlen, ifa_flags,
3345 preferred_lft, valid_lft);
3346 }
3347
3348 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3349 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3350 err = -EEXIST;
3351 else
3352 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3353
3354 in6_ifa_put(ifa);
3355
3356 return err;
3357 }
3358
3359 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3360 u8 scope, int ifindex)
3361 {
3362 struct ifaddrmsg *ifm;
3363
3364 ifm = nlmsg_data(nlh);
3365 ifm->ifa_family = AF_INET6;
3366 ifm->ifa_prefixlen = prefixlen;
3367 ifm->ifa_flags = flags;
3368 ifm->ifa_scope = scope;
3369 ifm->ifa_index = ifindex;
3370 }
3371
3372 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3373 unsigned long tstamp, u32 preferred, u32 valid)
3374 {
3375 struct ifa_cacheinfo ci;
3376
3377 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3378 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3379 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3380 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3381 ci.ifa_prefered = preferred;
3382 ci.ifa_valid = valid;
3383
3384 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3385 }
3386
3387 static inline int rt_scope(int ifa_scope)
3388 {
3389 if (ifa_scope & IFA_HOST)
3390 return RT_SCOPE_HOST;
3391 else if (ifa_scope & IFA_LINK)
3392 return RT_SCOPE_LINK;
3393 else if (ifa_scope & IFA_SITE)
3394 return RT_SCOPE_SITE;
3395 else
3396 return RT_SCOPE_UNIVERSE;
3397 }
3398
3399 static inline int inet6_ifaddr_msgsize(void)
3400 {
3401 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3402 + nla_total_size(16) /* IFA_ADDRESS */
3403 + nla_total_size(sizeof(struct ifa_cacheinfo));
3404 }
3405
3406 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3407 u32 pid, u32 seq, int event, unsigned int flags)
3408 {
3409 struct nlmsghdr *nlh;
3410 u32 preferred, valid;
3411
3412 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3413 if (nlh == NULL)
3414 return -EMSGSIZE;
3415
3416 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3417 ifa->idev->dev->ifindex);
3418
3419 if (!(ifa->flags&IFA_F_PERMANENT)) {
3420 preferred = ifa->prefered_lft;
3421 valid = ifa->valid_lft;
3422 if (preferred != INFINITY_LIFE_TIME) {
3423 long tval = (jiffies - ifa->tstamp)/HZ;
3424 if (preferred > tval)
3425 preferred -= tval;
3426 else
3427 preferred = 0;
3428 if (valid != INFINITY_LIFE_TIME)
3429 valid -= tval;
3430 }
3431 } else {
3432 preferred = INFINITY_LIFE_TIME;
3433 valid = INFINITY_LIFE_TIME;
3434 }
3435
3436 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3437 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3438 nlmsg_cancel(skb, nlh);
3439 return -EMSGSIZE;
3440 }
3441
3442 return nlmsg_end(skb, nlh);
3443 }
3444
3445 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3446 u32 pid, u32 seq, int event, u16 flags)
3447 {
3448 struct nlmsghdr *nlh;
3449 u8 scope = RT_SCOPE_UNIVERSE;
3450 int ifindex = ifmca->idev->dev->ifindex;
3451
3452 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3453 scope = RT_SCOPE_SITE;
3454
3455 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3456 if (nlh == NULL)
3457 return -EMSGSIZE;
3458
3459 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3460 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3461 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3462 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3463 nlmsg_cancel(skb, nlh);
3464 return -EMSGSIZE;
3465 }
3466
3467 return nlmsg_end(skb, nlh);
3468 }
3469
3470 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3471 u32 pid, u32 seq, int event, unsigned int flags)
3472 {
3473 struct nlmsghdr *nlh;
3474 u8 scope = RT_SCOPE_UNIVERSE;
3475 int ifindex = ifaca->aca_idev->dev->ifindex;
3476
3477 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3478 scope = RT_SCOPE_SITE;
3479
3480 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3481 if (nlh == NULL)
3482 return -EMSGSIZE;
3483
3484 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3485 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3486 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3487 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3488 nlmsg_cancel(skb, nlh);
3489 return -EMSGSIZE;
3490 }
3491
3492 return nlmsg_end(skb, nlh);
3493 }
3494
3495 enum addr_type_t
3496 {
3497 UNICAST_ADDR,
3498 MULTICAST_ADDR,
3499 ANYCAST_ADDR,
3500 };
3501
3502 /* called with rcu_read_lock() */
3503 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3504 struct netlink_callback *cb, enum addr_type_t type,
3505 int s_ip_idx, int *p_ip_idx)
3506 {
3507 struct ifmcaddr6 *ifmca;
3508 struct ifacaddr6 *ifaca;
3509 int err = 1;
3510 int ip_idx = *p_ip_idx;
3511
3512 read_lock_bh(&idev->lock);
3513 switch (type) {
3514 case UNICAST_ADDR: {
3515 struct inet6_ifaddr *ifa;
3516
3517 /* unicast address incl. temp addr */
3518 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3519 if (++ip_idx < s_ip_idx)
3520 continue;
3521 err = inet6_fill_ifaddr(skb, ifa,
3522 NETLINK_CB(cb->skb).pid,
3523 cb->nlh->nlmsg_seq,
3524 RTM_NEWADDR,
3525 NLM_F_MULTI);
3526 if (err <= 0)
3527 break;
3528 }
3529 break;
3530 }
3531 case MULTICAST_ADDR:
3532 /* multicast address */
3533 for (ifmca = idev->mc_list; ifmca;
3534 ifmca = ifmca->next, ip_idx++) {
3535 if (ip_idx < s_ip_idx)
3536 continue;
3537 err = inet6_fill_ifmcaddr(skb, ifmca,
3538 NETLINK_CB(cb->skb).pid,
3539 cb->nlh->nlmsg_seq,
3540 RTM_GETMULTICAST,
3541 NLM_F_MULTI);
3542 if (err <= 0)
3543 break;
3544 }
3545 break;
3546 case ANYCAST_ADDR:
3547 /* anycast address */
3548 for (ifaca = idev->ac_list; ifaca;
3549 ifaca = ifaca->aca_next, ip_idx++) {
3550 if (ip_idx < s_ip_idx)
3551 continue;
3552 err = inet6_fill_ifacaddr(skb, ifaca,
3553 NETLINK_CB(cb->skb).pid,
3554 cb->nlh->nlmsg_seq,
3555 RTM_GETANYCAST,
3556 NLM_F_MULTI);
3557 if (err <= 0)
3558 break;
3559 }
3560 break;
3561 default:
3562 break;
3563 }
3564 read_unlock_bh(&idev->lock);
3565 *p_ip_idx = ip_idx;
3566 return err;
3567 }
3568
3569 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3570 enum addr_type_t type)
3571 {
3572 struct net *net = sock_net(skb->sk);
3573 int h, s_h;
3574 int idx, ip_idx;
3575 int s_idx, s_ip_idx;
3576 struct net_device *dev;
3577 struct inet6_dev *idev;
3578 struct hlist_head *head;
3579 struct hlist_node *node;
3580
3581 s_h = cb->args[0];
3582 s_idx = idx = cb->args[1];
3583 s_ip_idx = ip_idx = cb->args[2];
3584
3585 rcu_read_lock();
3586 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3587 idx = 0;
3588 head = &net->dev_index_head[h];
3589 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3590 if (idx < s_idx)
3591 goto cont;
3592 if (idx > s_idx)
3593 s_ip_idx = 0;
3594 ip_idx = 0;
3595 if ((idev = __in6_dev_get(dev)) == NULL)
3596 goto cont;
3597
3598 if (in6_dump_addrs(idev, skb, cb, type,
3599 s_ip_idx, &ip_idx) <= 0)
3600 goto done;
3601 cont:
3602 idx++;
3603 }
3604 }
3605 done:
3606 rcu_read_unlock();
3607 cb->args[0] = h;
3608 cb->args[1] = idx;
3609 cb->args[2] = ip_idx;
3610
3611 return skb->len;
3612 }
3613
3614 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3615 {
3616 enum addr_type_t type = UNICAST_ADDR;
3617
3618 return inet6_dump_addr(skb, cb, type);
3619 }
3620
3621 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3622 {
3623 enum addr_type_t type = MULTICAST_ADDR;
3624
3625 return inet6_dump_addr(skb, cb, type);
3626 }
3627
3628
3629 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3630 {
3631 enum addr_type_t type = ANYCAST_ADDR;
3632
3633 return inet6_dump_addr(skb, cb, type);
3634 }
3635
3636 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3637 void *arg)
3638 {
3639 struct net *net = sock_net(in_skb->sk);
3640 struct ifaddrmsg *ifm;
3641 struct nlattr *tb[IFA_MAX+1];
3642 struct in6_addr *addr = NULL;
3643 struct net_device *dev = NULL;
3644 struct inet6_ifaddr *ifa;
3645 struct sk_buff *skb;
3646 int err;
3647
3648 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3649 if (err < 0)
3650 goto errout;
3651
3652 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3653 if (addr == NULL) {
3654 err = -EINVAL;
3655 goto errout;
3656 }
3657
3658 ifm = nlmsg_data(nlh);
3659 if (ifm->ifa_index)
3660 dev = __dev_get_by_index(net, ifm->ifa_index);
3661
3662 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3663 err = -EADDRNOTAVAIL;
3664 goto errout;
3665 }
3666
3667 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3668 err = -ENOBUFS;
3669 goto errout_ifa;
3670 }
3671
3672 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3673 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3674 if (err < 0) {
3675 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3676 WARN_ON(err == -EMSGSIZE);
3677 kfree_skb(skb);
3678 goto errout_ifa;
3679 }
3680 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3681 errout_ifa:
3682 in6_ifa_put(ifa);
3683 errout:
3684 return err;
3685 }
3686
3687 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3688 {
3689 struct sk_buff *skb;
3690 struct net *net = dev_net(ifa->idev->dev);
3691 int err = -ENOBUFS;
3692
3693 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3694 if (skb == NULL)
3695 goto errout;
3696
3697 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3698 if (err < 0) {
3699 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3700 WARN_ON(err == -EMSGSIZE);
3701 kfree_skb(skb);
3702 goto errout;
3703 }
3704 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3705 return;
3706 errout:
3707 if (err < 0)
3708 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3709 }
3710
3711 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3712 __s32 *array, int bytes)
3713 {
3714 BUG_ON(bytes < (DEVCONF_MAX * 4));
3715
3716 memset(array, 0, bytes);
3717 array[DEVCONF_FORWARDING] = cnf->forwarding;
3718 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3719 array[DEVCONF_MTU6] = cnf->mtu6;
3720 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3721 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3722 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3723 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3724 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3725 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3726 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3727 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3728 #ifdef CONFIG_IPV6_PRIVACY
3729 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3730 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3731 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3732 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3733 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3734 #endif
3735 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3736 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3737 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3738 #ifdef CONFIG_IPV6_ROUTER_PREF
3739 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3740 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3741 #ifdef CONFIG_IPV6_ROUTE_INFO
3742 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3743 #endif
3744 #endif
3745 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3746 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3747 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3748 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3749 #endif
3750 #ifdef CONFIG_IPV6_MROUTE
3751 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3752 #endif
3753 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3754 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3755 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3756 }
3757
3758 static inline size_t inet6_if_nlmsg_size(void)
3759 {
3760 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3761 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3762 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3763 + nla_total_size(4) /* IFLA_MTU */
3764 + nla_total_size(4) /* IFLA_LINK */
3765 + nla_total_size( /* IFLA_PROTINFO */
3766 nla_total_size(4) /* IFLA_INET6_FLAGS */
3767 + nla_total_size(sizeof(struct ifla_cacheinfo))
3768 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3769 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3770 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3771 );
3772 }
3773
3774 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3775 int items, int bytes)
3776 {
3777 int i;
3778 int pad = bytes - sizeof(u64) * items;
3779 BUG_ON(pad < 0);
3780
3781 /* Use put_unaligned() because stats may not be aligned for u64. */
3782 put_unaligned(items, &stats[0]);
3783 for (i = 1; i < items; i++)
3784 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3785
3786 memset(&stats[items], 0, pad);
3787 }
3788
3789 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3790 int bytes)
3791 {
3792 switch(attrtype) {
3793 case IFLA_INET6_STATS:
3794 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3795 break;
3796 case IFLA_INET6_ICMP6STATS:
3797 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3798 break;
3799 }
3800 }
3801
3802 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3803 u32 pid, u32 seq, int event, unsigned int flags)
3804 {
3805 struct net_device *dev = idev->dev;
3806 struct nlattr *nla;
3807 struct ifinfomsg *hdr;
3808 struct nlmsghdr *nlh;
3809 void *protoinfo;
3810 struct ifla_cacheinfo ci;
3811
3812 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3813 if (nlh == NULL)
3814 return -EMSGSIZE;
3815
3816 hdr = nlmsg_data(nlh);
3817 hdr->ifi_family = AF_INET6;
3818 hdr->__ifi_pad = 0;
3819 hdr->ifi_type = dev->type;
3820 hdr->ifi_index = dev->ifindex;
3821 hdr->ifi_flags = dev_get_flags(dev);
3822 hdr->ifi_change = 0;
3823
3824 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3825
3826 if (dev->addr_len)
3827 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3828
3829 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3830 if (dev->ifindex != dev->iflink)
3831 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3832
3833 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3834 if (protoinfo == NULL)
3835 goto nla_put_failure;
3836
3837 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3838
3839 ci.max_reasm_len = IPV6_MAXPLEN;
3840 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3841 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3842 ci.reachable_time = idev->nd_parms->reachable_time;
3843 ci.retrans_time = idev->nd_parms->retrans_time;
3844 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3845
3846 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3847 if (nla == NULL)
3848 goto nla_put_failure;
3849 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3850
3851 /* XXX - MC not implemented */
3852
3853 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3854 if (nla == NULL)
3855 goto nla_put_failure;
3856 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3857
3858 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3859 if (nla == NULL)
3860 goto nla_put_failure;
3861 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3862
3863 nla_nest_end(skb, protoinfo);
3864 return nlmsg_end(skb, nlh);
3865
3866 nla_put_failure:
3867 nlmsg_cancel(skb, nlh);
3868 return -EMSGSIZE;
3869 }
3870
3871 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3872 {
3873 struct net *net = sock_net(skb->sk);
3874 int h, s_h;
3875 int idx = 0, s_idx;
3876 struct net_device *dev;
3877 struct inet6_dev *idev;
3878 struct hlist_head *head;
3879 struct hlist_node *node;
3880
3881 s_h = cb->args[0];
3882 s_idx = cb->args[1];
3883
3884 rcu_read_lock();
3885 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3886 idx = 0;
3887 head = &net->dev_index_head[h];
3888 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3889 if (idx < s_idx)
3890 goto cont;
3891 idev = __in6_dev_get(dev);
3892 if (!idev)
3893 goto cont;
3894 if (inet6_fill_ifinfo(skb, idev,
3895 NETLINK_CB(cb->skb).pid,
3896 cb->nlh->nlmsg_seq,
3897 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3898 goto out;
3899 cont:
3900 idx++;
3901 }
3902 }
3903 out:
3904 rcu_read_unlock();
3905 cb->args[1] = idx;
3906 cb->args[0] = h;
3907
3908 return skb->len;
3909 }
3910
3911 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3912 {
3913 struct sk_buff *skb;
3914 struct net *net = dev_net(idev->dev);
3915 int err = -ENOBUFS;
3916
3917 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3918 if (skb == NULL)
3919 goto errout;
3920
3921 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3922 if (err < 0) {
3923 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3924 WARN_ON(err == -EMSGSIZE);
3925 kfree_skb(skb);
3926 goto errout;
3927 }
3928 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3929 return;
3930 errout:
3931 if (err < 0)
3932 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3933 }
3934
3935 static inline size_t inet6_prefix_nlmsg_size(void)
3936 {
3937 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3938 + nla_total_size(sizeof(struct in6_addr))
3939 + nla_total_size(sizeof(struct prefix_cacheinfo));
3940 }
3941
3942 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3943 struct prefix_info *pinfo, u32 pid, u32 seq,
3944 int event, unsigned int flags)
3945 {
3946 struct prefixmsg *pmsg;
3947 struct nlmsghdr *nlh;
3948 struct prefix_cacheinfo ci;
3949
3950 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3951 if (nlh == NULL)
3952 return -EMSGSIZE;
3953
3954 pmsg = nlmsg_data(nlh);
3955 pmsg->prefix_family = AF_INET6;
3956 pmsg->prefix_pad1 = 0;
3957 pmsg->prefix_pad2 = 0;
3958 pmsg->prefix_ifindex = idev->dev->ifindex;
3959 pmsg->prefix_len = pinfo->prefix_len;
3960 pmsg->prefix_type = pinfo->type;
3961 pmsg->prefix_pad3 = 0;
3962 pmsg->prefix_flags = 0;
3963 if (pinfo->onlink)
3964 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3965 if (pinfo->autoconf)
3966 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3967
3968 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3969
3970 ci.preferred_time = ntohl(pinfo->prefered);
3971 ci.valid_time = ntohl(pinfo->valid);
3972 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3973
3974 return nlmsg_end(skb, nlh);
3975
3976 nla_put_failure:
3977 nlmsg_cancel(skb, nlh);
3978 return -EMSGSIZE;
3979 }
3980
3981 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3982 struct prefix_info *pinfo)
3983 {
3984 struct sk_buff *skb;
3985 struct net *net = dev_net(idev->dev);
3986 int err = -ENOBUFS;
3987
3988 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3989 if (skb == NULL)
3990 goto errout;
3991
3992 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3993 if (err < 0) {
3994 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3995 WARN_ON(err == -EMSGSIZE);
3996 kfree_skb(skb);
3997 goto errout;
3998 }
3999 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4000 return;
4001 errout:
4002 if (err < 0)
4003 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4004 }
4005
4006 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4007 {
4008 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4009
4010 switch (event) {
4011 case RTM_NEWADDR:
4012 /*
4013 * If the address was optimistic
4014 * we inserted the route at the start of
4015 * our DAD process, so we don't need
4016 * to do it again
4017 */
4018 if (!(ifp->rt->rt6i_node))
4019 ip6_ins_rt(ifp->rt);
4020 if (ifp->idev->cnf.forwarding)
4021 addrconf_join_anycast(ifp);
4022 break;
4023 case RTM_DELADDR:
4024 if (ifp->idev->cnf.forwarding)
4025 addrconf_leave_anycast(ifp);
4026 addrconf_leave_solict(ifp->idev, &ifp->addr);
4027 dst_hold(&ifp->rt->u.dst);
4028 if (ip6_del_rt(ifp->rt))
4029 dst_free(&ifp->rt->u.dst);
4030 break;
4031 }
4032 }
4033
4034 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4035 {
4036 rcu_read_lock_bh();
4037 if (likely(ifp->idev->dead == 0))
4038 __ipv6_ifa_notify(event, ifp);
4039 rcu_read_unlock_bh();
4040 }
4041
4042 #ifdef CONFIG_SYSCTL
4043
4044 static
4045 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4046 void __user *buffer, size_t *lenp, loff_t *ppos)
4047 {
4048 int *valp = ctl->data;
4049 int val = *valp;
4050 loff_t pos = *ppos;
4051 int ret;
4052
4053 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4054
4055 if (write)
4056 ret = addrconf_fixup_forwarding(ctl, valp, val);
4057 if (ret)
4058 *ppos = pos;
4059 return ret;
4060 }
4061
4062 static void dev_disable_change(struct inet6_dev *idev)
4063 {
4064 if (!idev || !idev->dev)
4065 return;
4066
4067 if (idev->cnf.disable_ipv6)
4068 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4069 else
4070 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4071 }
4072
4073 static void addrconf_disable_change(struct net *net, __s32 newf)
4074 {
4075 struct net_device *dev;
4076 struct inet6_dev *idev;
4077
4078 rcu_read_lock();
4079 for_each_netdev_rcu(net, dev) {
4080 idev = __in6_dev_get(dev);
4081 if (idev) {
4082 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4083 idev->cnf.disable_ipv6 = newf;
4084 if (changed)
4085 dev_disable_change(idev);
4086 }
4087 }
4088 rcu_read_unlock();
4089 }
4090
4091 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4092 {
4093 struct net *net;
4094
4095 net = (struct net *)table->extra2;
4096
4097 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4098 return 0;
4099
4100 if (!rtnl_trylock()) {
4101 /* Restore the original values before restarting */
4102 *p = old;
4103 return restart_syscall();
4104 }
4105
4106 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4107 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4108 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4109 addrconf_disable_change(net, newf);
4110 } else if ((!*p) ^ (!old))
4111 dev_disable_change((struct inet6_dev *)table->extra1);
4112
4113 rtnl_unlock();
4114 return 0;
4115 }
4116
4117 static
4118 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4119 void __user *buffer, size_t *lenp, loff_t *ppos)
4120 {
4121 int *valp = ctl->data;
4122 int val = *valp;
4123 loff_t pos = *ppos;
4124 int ret;
4125
4126 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4127
4128 if (write)
4129 ret = addrconf_disable_ipv6(ctl, valp, val);
4130 if (ret)
4131 *ppos = pos;
4132 return ret;
4133 }
4134
4135 static struct addrconf_sysctl_table
4136 {
4137 struct ctl_table_header *sysctl_header;
4138 ctl_table addrconf_vars[DEVCONF_MAX+1];
4139 char *dev_name;
4140 } addrconf_sysctl __read_mostly = {
4141 .sysctl_header = NULL,
4142 .addrconf_vars = {
4143 {
4144 .procname = "forwarding",
4145 .data = &ipv6_devconf.forwarding,
4146 .maxlen = sizeof(int),
4147 .mode = 0644,
4148 .proc_handler = addrconf_sysctl_forward,
4149 },
4150 {
4151 .procname = "hop_limit",
4152 .data = &ipv6_devconf.hop_limit,
4153 .maxlen = sizeof(int),
4154 .mode = 0644,
4155 .proc_handler = proc_dointvec,
4156 },
4157 {
4158 .procname = "mtu",
4159 .data = &ipv6_devconf.mtu6,
4160 .maxlen = sizeof(int),
4161 .mode = 0644,
4162 .proc_handler = proc_dointvec,
4163 },
4164 {
4165 .procname = "accept_ra",
4166 .data = &ipv6_devconf.accept_ra,
4167 .maxlen = sizeof(int),
4168 .mode = 0644,
4169 .proc_handler = proc_dointvec,
4170 },
4171 {
4172 .procname = "accept_redirects",
4173 .data = &ipv6_devconf.accept_redirects,
4174 .maxlen = sizeof(int),
4175 .mode = 0644,
4176 .proc_handler = proc_dointvec,
4177 },
4178 {
4179 .procname = "autoconf",
4180 .data = &ipv6_devconf.autoconf,
4181 .maxlen = sizeof(int),
4182 .mode = 0644,
4183 .proc_handler = proc_dointvec,
4184 },
4185 {
4186 .procname = "dad_transmits",
4187 .data = &ipv6_devconf.dad_transmits,
4188 .maxlen = sizeof(int),
4189 .mode = 0644,
4190 .proc_handler = proc_dointvec,
4191 },
4192 {
4193 .procname = "router_solicitations",
4194 .data = &ipv6_devconf.rtr_solicits,
4195 .maxlen = sizeof(int),
4196 .mode = 0644,
4197 .proc_handler = proc_dointvec,
4198 },
4199 {
4200 .procname = "router_solicitation_interval",
4201 .data = &ipv6_devconf.rtr_solicit_interval,
4202 .maxlen = sizeof(int),
4203 .mode = 0644,
4204 .proc_handler = proc_dointvec_jiffies,
4205 },
4206 {
4207 .procname = "router_solicitation_delay",
4208 .data = &ipv6_devconf.rtr_solicit_delay,
4209 .maxlen = sizeof(int),
4210 .mode = 0644,
4211 .proc_handler = proc_dointvec_jiffies,
4212 },
4213 {
4214 .procname = "force_mld_version",
4215 .data = &ipv6_devconf.force_mld_version,
4216 .maxlen = sizeof(int),
4217 .mode = 0644,
4218 .proc_handler = proc_dointvec,
4219 },
4220 #ifdef CONFIG_IPV6_PRIVACY
4221 {
4222 .procname = "use_tempaddr",
4223 .data = &ipv6_devconf.use_tempaddr,
4224 .maxlen = sizeof(int),
4225 .mode = 0644,
4226 .proc_handler = proc_dointvec,
4227 },
4228 {
4229 .procname = "temp_valid_lft",
4230 .data = &ipv6_devconf.temp_valid_lft,
4231 .maxlen = sizeof(int),
4232 .mode = 0644,
4233 .proc_handler = proc_dointvec,
4234 },
4235 {
4236 .procname = "temp_prefered_lft",
4237 .data = &ipv6_devconf.temp_prefered_lft,
4238 .maxlen = sizeof(int),
4239 .mode = 0644,
4240 .proc_handler = proc_dointvec,
4241 },
4242 {
4243 .procname = "regen_max_retry",
4244 .data = &ipv6_devconf.regen_max_retry,
4245 .maxlen = sizeof(int),
4246 .mode = 0644,
4247 .proc_handler = proc_dointvec,
4248 },
4249 {
4250 .procname = "max_desync_factor",
4251 .data = &ipv6_devconf.max_desync_factor,
4252 .maxlen = sizeof(int),
4253 .mode = 0644,
4254 .proc_handler = proc_dointvec,
4255 },
4256 #endif
4257 {
4258 .procname = "max_addresses",
4259 .data = &ipv6_devconf.max_addresses,
4260 .maxlen = sizeof(int),
4261 .mode = 0644,
4262 .proc_handler = proc_dointvec,
4263 },
4264 {
4265 .procname = "accept_ra_defrtr",
4266 .data = &ipv6_devconf.accept_ra_defrtr,
4267 .maxlen = sizeof(int),
4268 .mode = 0644,
4269 .proc_handler = proc_dointvec,
4270 },
4271 {
4272 .procname = "accept_ra_pinfo",
4273 .data = &ipv6_devconf.accept_ra_pinfo,
4274 .maxlen = sizeof(int),
4275 .mode = 0644,
4276 .proc_handler = proc_dointvec,
4277 },
4278 #ifdef CONFIG_IPV6_ROUTER_PREF
4279 {
4280 .procname = "accept_ra_rtr_pref",
4281 .data = &ipv6_devconf.accept_ra_rtr_pref,
4282 .maxlen = sizeof(int),
4283 .mode = 0644,
4284 .proc_handler = proc_dointvec,
4285 },
4286 {
4287 .procname = "router_probe_interval",
4288 .data = &ipv6_devconf.rtr_probe_interval,
4289 .maxlen = sizeof(int),
4290 .mode = 0644,
4291 .proc_handler = proc_dointvec_jiffies,
4292 },
4293 #ifdef CONFIG_IPV6_ROUTE_INFO
4294 {
4295 .procname = "accept_ra_rt_info_max_plen",
4296 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4297 .maxlen = sizeof(int),
4298 .mode = 0644,
4299 .proc_handler = proc_dointvec,
4300 },
4301 #endif
4302 #endif
4303 {
4304 .procname = "proxy_ndp",
4305 .data = &ipv6_devconf.proxy_ndp,
4306 .maxlen = sizeof(int),
4307 .mode = 0644,
4308 .proc_handler = proc_dointvec,
4309 },
4310 {
4311 .procname = "accept_source_route",
4312 .data = &ipv6_devconf.accept_source_route,
4313 .maxlen = sizeof(int),
4314 .mode = 0644,
4315 .proc_handler = proc_dointvec,
4316 },
4317 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4318 {
4319 .procname = "optimistic_dad",
4320 .data = &ipv6_devconf.optimistic_dad,
4321 .maxlen = sizeof(int),
4322 .mode = 0644,
4323 .proc_handler = proc_dointvec,
4324
4325 },
4326 #endif
4327 #ifdef CONFIG_IPV6_MROUTE
4328 {
4329 .procname = "mc_forwarding",
4330 .data = &ipv6_devconf.mc_forwarding,
4331 .maxlen = sizeof(int),
4332 .mode = 0444,
4333 .proc_handler = proc_dointvec,
4334 },
4335 #endif
4336 {
4337 .procname = "disable_ipv6",
4338 .data = &ipv6_devconf.disable_ipv6,
4339 .maxlen = sizeof(int),
4340 .mode = 0644,
4341 .proc_handler = addrconf_sysctl_disable,
4342 },
4343 {
4344 .procname = "accept_dad",
4345 .data = &ipv6_devconf.accept_dad,
4346 .maxlen = sizeof(int),
4347 .mode = 0644,
4348 .proc_handler = proc_dointvec,
4349 },
4350 {
4351 .procname = "force_tllao",
4352 .data = &ipv6_devconf.force_tllao,
4353 .maxlen = sizeof(int),
4354 .mode = 0644,
4355 .proc_handler = proc_dointvec
4356 },
4357 {
4358 /* sentinel */
4359 }
4360 },
4361 };
4362
4363 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4364 struct inet6_dev *idev, struct ipv6_devconf *p)
4365 {
4366 int i;
4367 struct addrconf_sysctl_table *t;
4368
4369 #define ADDRCONF_CTL_PATH_DEV 3
4370
4371 struct ctl_path addrconf_ctl_path[] = {
4372 { .procname = "net", },
4373 { .procname = "ipv6", },
4374 { .procname = "conf", },
4375 { /* to be set */ },
4376 { },
4377 };
4378
4379
4380 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4381 if (t == NULL)
4382 goto out;
4383
4384 for (i = 0; t->addrconf_vars[i].data; i++) {
4385 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4386 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4387 t->addrconf_vars[i].extra2 = net;
4388 }
4389
4390 /*
4391 * Make a copy of dev_name, because '.procname' is regarded as const
4392 * by sysctl and we wouldn't want anyone to change it under our feet
4393 * (see SIOCSIFNAME).
4394 */
4395 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4396 if (!t->dev_name)
4397 goto free;
4398
4399 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4400
4401 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4402 t->addrconf_vars);
4403 if (t->sysctl_header == NULL)
4404 goto free_procname;
4405
4406 p->sysctl = t;
4407 return 0;
4408
4409 free_procname:
4410 kfree(t->dev_name);
4411 free:
4412 kfree(t);
4413 out:
4414 return -ENOBUFS;
4415 }
4416
4417 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4418 {
4419 struct addrconf_sysctl_table *t;
4420
4421 if (p->sysctl == NULL)
4422 return;
4423
4424 t = p->sysctl;
4425 p->sysctl = NULL;
4426 unregister_sysctl_table(t->sysctl_header);
4427 kfree(t->dev_name);
4428 kfree(t);
4429 }
4430
4431 static void addrconf_sysctl_register(struct inet6_dev *idev)
4432 {
4433 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4434 &ndisc_ifinfo_sysctl_change);
4435 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4436 idev, &idev->cnf);
4437 }
4438
4439 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4440 {
4441 __addrconf_sysctl_unregister(&idev->cnf);
4442 neigh_sysctl_unregister(idev->nd_parms);
4443 }
4444
4445
4446 #endif
4447
4448 static int __net_init addrconf_init_net(struct net *net)
4449 {
4450 int err;
4451 struct ipv6_devconf *all, *dflt;
4452
4453 err = -ENOMEM;
4454 all = &ipv6_devconf;
4455 dflt = &ipv6_devconf_dflt;
4456
4457 if (!net_eq(net, &init_net)) {
4458 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4459 if (all == NULL)
4460 goto err_alloc_all;
4461
4462 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4463 if (dflt == NULL)
4464 goto err_alloc_dflt;
4465 } else {
4466 /* these will be inherited by all namespaces */
4467 dflt->autoconf = ipv6_defaults.autoconf;
4468 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4469 }
4470
4471 net->ipv6.devconf_all = all;
4472 net->ipv6.devconf_dflt = dflt;
4473
4474 #ifdef CONFIG_SYSCTL
4475 err = __addrconf_sysctl_register(net, "all", NULL, all);
4476 if (err < 0)
4477 goto err_reg_all;
4478
4479 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4480 if (err < 0)
4481 goto err_reg_dflt;
4482 #endif
4483 return 0;
4484
4485 #ifdef CONFIG_SYSCTL
4486 err_reg_dflt:
4487 __addrconf_sysctl_unregister(all);
4488 err_reg_all:
4489 kfree(dflt);
4490 #endif
4491 err_alloc_dflt:
4492 kfree(all);
4493 err_alloc_all:
4494 return err;
4495 }
4496
4497 static void __net_exit addrconf_exit_net(struct net *net)
4498 {
4499 #ifdef CONFIG_SYSCTL
4500 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4501 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4502 #endif
4503 if (!net_eq(net, &init_net)) {
4504 kfree(net->ipv6.devconf_dflt);
4505 kfree(net->ipv6.devconf_all);
4506 }
4507 }
4508
4509 static struct pernet_operations addrconf_ops = {
4510 .init = addrconf_init_net,
4511 .exit = addrconf_exit_net,
4512 };
4513
4514 /*
4515 * Device notifier
4516 */
4517
4518 int register_inet6addr_notifier(struct notifier_block *nb)
4519 {
4520 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4521 }
4522
4523 EXPORT_SYMBOL(register_inet6addr_notifier);
4524
4525 int unregister_inet6addr_notifier(struct notifier_block *nb)
4526 {
4527 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4528 }
4529
4530 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4531
4532 /*
4533 * Init / cleanup code
4534 */
4535
4536 int __init addrconf_init(void)
4537 {
4538 int i, err;
4539
4540 if ((err = ipv6_addr_label_init()) < 0) {
4541 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4542 err);
4543 return err;
4544 }
4545
4546 register_pernet_subsys(&addrconf_ops);
4547
4548 /* The addrconf netdev notifier requires that loopback_dev
4549 * has it's ipv6 private information allocated and setup
4550 * before it can bring up and give link-local addresses
4551 * to other devices which are up.
4552 *
4553 * Unfortunately, loopback_dev is not necessarily the first
4554 * entry in the global dev_base list of net devices. In fact,
4555 * it is likely to be the very last entry on that list.
4556 * So this causes the notifier registry below to try and
4557 * give link-local addresses to all devices besides loopback_dev
4558 * first, then loopback_dev, which cases all the non-loopback_dev
4559 * devices to fail to get a link-local address.
4560 *
4561 * So, as a temporary fix, allocate the ipv6 structure for
4562 * loopback_dev first by hand.
4563 * Longer term, all of the dependencies ipv6 has upon the loopback
4564 * device and it being up should be removed.
4565 */
4566 rtnl_lock();
4567 if (!ipv6_add_dev(init_net.loopback_dev))
4568 err = -ENOMEM;
4569 rtnl_unlock();
4570 if (err)
4571 goto errlo;
4572
4573 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4574 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4575
4576 register_netdevice_notifier(&ipv6_dev_notf);
4577
4578 addrconf_verify(0);
4579
4580 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4581 if (err < 0)
4582 goto errout;
4583
4584 /* Only the first call to __rtnl_register can fail */
4585 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4586 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4587 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4588 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4589 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4590
4591 ipv6_addr_label_rtnl_register();
4592
4593 return 0;
4594 errout:
4595 unregister_netdevice_notifier(&ipv6_dev_notf);
4596 errlo:
4597 unregister_pernet_subsys(&addrconf_ops);
4598
4599 return err;
4600 }
4601
4602 void addrconf_cleanup(void)
4603 {
4604 struct net_device *dev;
4605 int i;
4606
4607 unregister_netdevice_notifier(&ipv6_dev_notf);
4608 unregister_pernet_subsys(&addrconf_ops);
4609
4610 rtnl_lock();
4611
4612 /* clean dev list */
4613 for_each_netdev(&init_net, dev) {
4614 if (__in6_dev_get(dev) == NULL)
4615 continue;
4616 addrconf_ifdown(dev, 1);
4617 }
4618 addrconf_ifdown(init_net.loopback_dev, 2);
4619
4620 /*
4621 * Check hash table.
4622 */
4623 spin_lock_bh(&addrconf_hash_lock);
4624 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4625 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4626 spin_unlock_bh(&addrconf_hash_lock);
4627
4628 del_timer(&addr_chk_timer);
4629 rtnl_unlock();
4630 }
Linux kernel - Deliverables
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