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ext3: Flush disk caches on fsync when needed
[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 inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
130 static DEFINE_RWLOCK(addrconf_hash_lock);
131
132 static void addrconf_verify(unsigned long);
133
134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
135 static DEFINE_SPINLOCK(addrconf_verify_lock);
136
137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139
140 static int addrconf_ifdown(struct net_device *dev, int how);
141
142 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
143 static void addrconf_dad_timer(unsigned long data);
144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
145 static void addrconf_dad_run(struct inet6_dev *idev);
146 static void addrconf_rs_timer(unsigned long data);
147 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
149
150 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
151 struct prefix_info *pinfo);
152 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
153 struct net_device *dev);
154
155 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
156
157 static struct ipv6_devconf ipv6_devconf __read_mostly = {
158 .forwarding = 0,
159 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
160 .mtu6 = IPV6_MIN_MTU,
161 .accept_ra = 1,
162 .accept_redirects = 1,
163 .autoconf = 1,
164 .force_mld_version = 0,
165 .dad_transmits = 1,
166 .rtr_solicits = MAX_RTR_SOLICITATIONS,
167 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
168 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
169 #ifdef CONFIG_IPV6_PRIVACY
170 .use_tempaddr = 0,
171 .temp_valid_lft = TEMP_VALID_LIFETIME,
172 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
173 .regen_max_retry = REGEN_MAX_RETRY,
174 .max_desync_factor = MAX_DESYNC_FACTOR,
175 #endif
176 .max_addresses = IPV6_MAX_ADDRESSES,
177 .accept_ra_defrtr = 1,
178 .accept_ra_pinfo = 1,
179 #ifdef CONFIG_IPV6_ROUTER_PREF
180 .accept_ra_rtr_pref = 1,
181 .rtr_probe_interval = 60 * HZ,
182 #ifdef CONFIG_IPV6_ROUTE_INFO
183 .accept_ra_rt_info_max_plen = 0,
184 #endif
185 #endif
186 .proxy_ndp = 0,
187 .accept_source_route = 0, /* we do not accept RH0 by default. */
188 .disable_ipv6 = 0,
189 .accept_dad = 1,
190 };
191
192 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
193 .forwarding = 0,
194 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
195 .mtu6 = IPV6_MIN_MTU,
196 .accept_ra = 1,
197 .accept_redirects = 1,
198 .autoconf = 1,
199 .dad_transmits = 1,
200 .rtr_solicits = MAX_RTR_SOLICITATIONS,
201 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
202 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
203 #ifdef CONFIG_IPV6_PRIVACY
204 .use_tempaddr = 0,
205 .temp_valid_lft = TEMP_VALID_LIFETIME,
206 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
207 .regen_max_retry = REGEN_MAX_RETRY,
208 .max_desync_factor = MAX_DESYNC_FACTOR,
209 #endif
210 .max_addresses = IPV6_MAX_ADDRESSES,
211 .accept_ra_defrtr = 1,
212 .accept_ra_pinfo = 1,
213 #ifdef CONFIG_IPV6_ROUTER_PREF
214 .accept_ra_rtr_pref = 1,
215 .rtr_probe_interval = 60 * HZ,
216 #ifdef CONFIG_IPV6_ROUTE_INFO
217 .accept_ra_rt_info_max_plen = 0,
218 #endif
219 #endif
220 .proxy_ndp = 0,
221 .accept_source_route = 0, /* we do not accept RH0 by default. */
222 .disable_ipv6 = 0,
223 .accept_dad = 1,
224 };
225
226 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
227 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
228 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
229 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
230 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
231
232 /* Check if a valid qdisc is available */
233 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
234 {
235 return !qdisc_tx_is_noop(dev);
236 }
237
238 /* Check if a route is valid prefix route */
239 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
240 {
241 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
242 }
243
244 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
245 {
246 if (del_timer(&ifp->timer))
247 __in6_ifa_put(ifp);
248 }
249
250 enum addrconf_timer_t
251 {
252 AC_NONE,
253 AC_DAD,
254 AC_RS,
255 };
256
257 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
258 enum addrconf_timer_t what,
259 unsigned long when)
260 {
261 if (!del_timer(&ifp->timer))
262 in6_ifa_hold(ifp);
263
264 switch (what) {
265 case AC_DAD:
266 ifp->timer.function = addrconf_dad_timer;
267 break;
268 case AC_RS:
269 ifp->timer.function = addrconf_rs_timer;
270 break;
271 default:;
272 }
273 ifp->timer.expires = jiffies + when;
274 add_timer(&ifp->timer);
275 }
276
277 static int snmp6_alloc_dev(struct inet6_dev *idev)
278 {
279 if (snmp_mib_init((void **)idev->stats.ipv6,
280 sizeof(struct ipstats_mib)) < 0)
281 goto err_ip;
282 if (snmp_mib_init((void **)idev->stats.icmpv6,
283 sizeof(struct icmpv6_mib)) < 0)
284 goto err_icmp;
285 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
286 sizeof(struct icmpv6msg_mib)) < 0)
287 goto err_icmpmsg;
288
289 return 0;
290
291 err_icmpmsg:
292 snmp_mib_free((void **)idev->stats.icmpv6);
293 err_icmp:
294 snmp_mib_free((void **)idev->stats.ipv6);
295 err_ip:
296 return -ENOMEM;
297 }
298
299 static void snmp6_free_dev(struct inet6_dev *idev)
300 {
301 snmp_mib_free((void **)idev->stats.icmpv6msg);
302 snmp_mib_free((void **)idev->stats.icmpv6);
303 snmp_mib_free((void **)idev->stats.ipv6);
304 }
305
306 /* Nobody refers to this device, we may destroy it. */
307
308 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
309 {
310 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
311 kfree(idev);
312 }
313
314 void in6_dev_finish_destroy(struct inet6_dev *idev)
315 {
316 struct net_device *dev = idev->dev;
317
318 WARN_ON(idev->addr_list != NULL);
319 WARN_ON(idev->mc_list != NULL);
320
321 #ifdef NET_REFCNT_DEBUG
322 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
323 #endif
324 dev_put(dev);
325 if (!idev->dead) {
326 printk("Freeing alive inet6 device %p\n", idev);
327 return;
328 }
329 snmp6_free_dev(idev);
330 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
331 }
332
333 EXPORT_SYMBOL(in6_dev_finish_destroy);
334
335 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
336 {
337 struct inet6_dev *ndev;
338
339 ASSERT_RTNL();
340
341 if (dev->mtu < IPV6_MIN_MTU)
342 return NULL;
343
344 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
345
346 if (ndev == NULL)
347 return NULL;
348
349 rwlock_init(&ndev->lock);
350 ndev->dev = dev;
351 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
352 ndev->cnf.mtu6 = dev->mtu;
353 ndev->cnf.sysctl = NULL;
354 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
355 if (ndev->nd_parms == NULL) {
356 kfree(ndev);
357 return NULL;
358 }
359 if (ndev->cnf.forwarding)
360 dev_disable_lro(dev);
361 /* We refer to the device */
362 dev_hold(dev);
363
364 if (snmp6_alloc_dev(ndev) < 0) {
365 ADBG((KERN_WARNING
366 "%s(): cannot allocate memory for statistics; dev=%s.\n",
367 __func__, dev->name));
368 neigh_parms_release(&nd_tbl, ndev->nd_parms);
369 ndev->dead = 1;
370 in6_dev_finish_destroy(ndev);
371 return NULL;
372 }
373
374 if (snmp6_register_dev(ndev) < 0) {
375 ADBG((KERN_WARNING
376 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
377 __func__, dev->name));
378 neigh_parms_release(&nd_tbl, ndev->nd_parms);
379 ndev->dead = 1;
380 in6_dev_finish_destroy(ndev);
381 return NULL;
382 }
383
384 /* One reference from device. We must do this before
385 * we invoke __ipv6_regen_rndid().
386 */
387 in6_dev_hold(ndev);
388
389 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
390 ndev->cnf.accept_dad = -1;
391
392 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
393 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
394 printk(KERN_INFO
395 "%s: Disabled Multicast RS\n",
396 dev->name);
397 ndev->cnf.rtr_solicits = 0;
398 }
399 #endif
400
401 #ifdef CONFIG_IPV6_PRIVACY
402 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
403 if ((dev->flags&IFF_LOOPBACK) ||
404 dev->type == ARPHRD_TUNNEL ||
405 dev->type == ARPHRD_TUNNEL6 ||
406 dev->type == ARPHRD_SIT ||
407 dev->type == ARPHRD_NONE) {
408 printk(KERN_INFO
409 "%s: Disabled Privacy Extensions\n",
410 dev->name);
411 ndev->cnf.use_tempaddr = -1;
412 } else {
413 in6_dev_hold(ndev);
414 ipv6_regen_rndid((unsigned long) ndev);
415 }
416 #endif
417
418 if (netif_running(dev) && addrconf_qdisc_ok(dev))
419 ndev->if_flags |= IF_READY;
420
421 ipv6_mc_init_dev(ndev);
422 ndev->tstamp = jiffies;
423 addrconf_sysctl_register(ndev);
424 /* protected by rtnl_lock */
425 rcu_assign_pointer(dev->ip6_ptr, ndev);
426
427 /* Join all-node multicast group */
428 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
429
430 return ndev;
431 }
432
433 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
434 {
435 struct inet6_dev *idev;
436
437 ASSERT_RTNL();
438
439 if ((idev = __in6_dev_get(dev)) == NULL) {
440 if ((idev = ipv6_add_dev(dev)) == NULL)
441 return NULL;
442 }
443
444 if (dev->flags&IFF_UP)
445 ipv6_mc_up(idev);
446 return idev;
447 }
448
449 #ifdef CONFIG_SYSCTL
450 static void dev_forward_change(struct inet6_dev *idev)
451 {
452 struct net_device *dev;
453 struct inet6_ifaddr *ifa;
454
455 if (!idev)
456 return;
457 dev = idev->dev;
458 if (idev->cnf.forwarding)
459 dev_disable_lro(dev);
460 if (dev && (dev->flags & IFF_MULTICAST)) {
461 if (idev->cnf.forwarding)
462 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
463 else
464 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
465 }
466 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
467 if (ifa->flags&IFA_F_TENTATIVE)
468 continue;
469 if (idev->cnf.forwarding)
470 addrconf_join_anycast(ifa);
471 else
472 addrconf_leave_anycast(ifa);
473 }
474 }
475
476
477 static void addrconf_forward_change(struct net *net, __s32 newf)
478 {
479 struct net_device *dev;
480 struct inet6_dev *idev;
481
482 read_lock(&dev_base_lock);
483 for_each_netdev(net, dev) {
484 rcu_read_lock();
485 idev = __in6_dev_get(dev);
486 if (idev) {
487 int changed = (!idev->cnf.forwarding) ^ (!newf);
488 idev->cnf.forwarding = newf;
489 if (changed)
490 dev_forward_change(idev);
491 }
492 rcu_read_unlock();
493 }
494 read_unlock(&dev_base_lock);
495 }
496
497 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
498 {
499 struct net *net;
500
501 net = (struct net *)table->extra2;
502 if (p == &net->ipv6.devconf_dflt->forwarding)
503 return 0;
504
505 if (!rtnl_trylock())
506 return restart_syscall();
507
508 if (p == &net->ipv6.devconf_all->forwarding) {
509 __s32 newf = net->ipv6.devconf_all->forwarding;
510 net->ipv6.devconf_dflt->forwarding = newf;
511 addrconf_forward_change(net, newf);
512 } else if ((!*p) ^ (!old))
513 dev_forward_change((struct inet6_dev *)table->extra1);
514 rtnl_unlock();
515
516 if (*p)
517 rt6_purge_dflt_routers(net);
518 return 1;
519 }
520 #endif
521
522 /* Nobody refers to this ifaddr, destroy it */
523
524 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
525 {
526 WARN_ON(ifp->if_next != NULL);
527 WARN_ON(ifp->lst_next != NULL);
528
529 #ifdef NET_REFCNT_DEBUG
530 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
531 #endif
532
533 in6_dev_put(ifp->idev);
534
535 if (del_timer(&ifp->timer))
536 printk("Timer is still running, when freeing ifa=%p\n", ifp);
537
538 if (!ifp->dead) {
539 printk("Freeing alive inet6 address %p\n", ifp);
540 return;
541 }
542 dst_release(&ifp->rt->u.dst);
543
544 kfree(ifp);
545 }
546
547 static void
548 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
549 {
550 struct inet6_ifaddr *ifa, **ifap;
551 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
552
553 /*
554 * Each device address list is sorted in order of scope -
555 * global before linklocal.
556 */
557 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
558 ifap = &ifa->if_next) {
559 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
560 break;
561 }
562
563 ifp->if_next = *ifap;
564 *ifap = ifp;
565 }
566
567 /*
568 * Hash function taken from net_alias.c
569 */
570 static u8 ipv6_addr_hash(const struct in6_addr *addr)
571 {
572 __u32 word;
573
574 /*
575 * We perform the hash function over the last 64 bits of the address
576 * This will include the IEEE address token on links that support it.
577 */
578
579 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
580 word ^= (word >> 16);
581 word ^= (word >> 8);
582
583 return ((word ^ (word >> 4)) & 0x0f);
584 }
585
586 /* On success it returns ifp with increased reference count */
587
588 static struct inet6_ifaddr *
589 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
590 int scope, u32 flags)
591 {
592 struct inet6_ifaddr *ifa = NULL;
593 struct rt6_info *rt;
594 int hash;
595 int err = 0;
596 int addr_type = ipv6_addr_type(addr);
597
598 if (addr_type == IPV6_ADDR_ANY ||
599 addr_type & IPV6_ADDR_MULTICAST ||
600 (!(idev->dev->flags & IFF_LOOPBACK) &&
601 addr_type & IPV6_ADDR_LOOPBACK))
602 return ERR_PTR(-EADDRNOTAVAIL);
603
604 rcu_read_lock_bh();
605 if (idev->dead) {
606 err = -ENODEV; /*XXX*/
607 goto out2;
608 }
609
610 if (idev->cnf.disable_ipv6) {
611 err = -EACCES;
612 goto out2;
613 }
614
615 write_lock(&addrconf_hash_lock);
616
617 /* Ignore adding duplicate addresses on an interface */
618 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
619 ADBG(("ipv6_add_addr: already assigned\n"));
620 err = -EEXIST;
621 goto out;
622 }
623
624 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
625
626 if (ifa == NULL) {
627 ADBG(("ipv6_add_addr: malloc failed\n"));
628 err = -ENOBUFS;
629 goto out;
630 }
631
632 rt = addrconf_dst_alloc(idev, addr, 0);
633 if (IS_ERR(rt)) {
634 err = PTR_ERR(rt);
635 goto out;
636 }
637
638 ipv6_addr_copy(&ifa->addr, addr);
639
640 spin_lock_init(&ifa->lock);
641 init_timer(&ifa->timer);
642 ifa->timer.data = (unsigned long) ifa;
643 ifa->scope = scope;
644 ifa->prefix_len = pfxlen;
645 ifa->flags = flags | IFA_F_TENTATIVE;
646 ifa->cstamp = ifa->tstamp = jiffies;
647
648 ifa->rt = rt;
649
650 /*
651 * part one of RFC 4429, section 3.3
652 * We should not configure an address as
653 * optimistic if we do not yet know the link
654 * layer address of our nexhop router
655 */
656
657 if (rt->rt6i_nexthop == NULL)
658 ifa->flags &= ~IFA_F_OPTIMISTIC;
659
660 ifa->idev = idev;
661 in6_dev_hold(idev);
662 /* For caller */
663 in6_ifa_hold(ifa);
664
665 /* Add to big hash table */
666 hash = ipv6_addr_hash(addr);
667
668 ifa->lst_next = inet6_addr_lst[hash];
669 inet6_addr_lst[hash] = ifa;
670 in6_ifa_hold(ifa);
671 write_unlock(&addrconf_hash_lock);
672
673 write_lock(&idev->lock);
674 /* Add to inet6_dev unicast addr list. */
675 ipv6_link_dev_addr(idev, ifa);
676
677 #ifdef CONFIG_IPV6_PRIVACY
678 if (ifa->flags&IFA_F_TEMPORARY) {
679 ifa->tmp_next = idev->tempaddr_list;
680 idev->tempaddr_list = ifa;
681 in6_ifa_hold(ifa);
682 }
683 #endif
684
685 in6_ifa_hold(ifa);
686 write_unlock(&idev->lock);
687 out2:
688 rcu_read_unlock_bh();
689
690 if (likely(err == 0))
691 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
692 else {
693 kfree(ifa);
694 ifa = ERR_PTR(err);
695 }
696
697 return ifa;
698 out:
699 write_unlock(&addrconf_hash_lock);
700 goto out2;
701 }
702
703 /* This function wants to get referenced ifp and releases it before return */
704
705 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
706 {
707 struct inet6_ifaddr *ifa, **ifap;
708 struct inet6_dev *idev = ifp->idev;
709 int hash;
710 int deleted = 0, onlink = 0;
711 unsigned long expires = jiffies;
712
713 hash = ipv6_addr_hash(&ifp->addr);
714
715 ifp->dead = 1;
716
717 write_lock_bh(&addrconf_hash_lock);
718 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
719 ifap = &ifa->lst_next) {
720 if (ifa == ifp) {
721 *ifap = ifa->lst_next;
722 __in6_ifa_put(ifp);
723 ifa->lst_next = NULL;
724 break;
725 }
726 }
727 write_unlock_bh(&addrconf_hash_lock);
728
729 write_lock_bh(&idev->lock);
730 #ifdef CONFIG_IPV6_PRIVACY
731 if (ifp->flags&IFA_F_TEMPORARY) {
732 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
733 ifap = &ifa->tmp_next) {
734 if (ifa == ifp) {
735 *ifap = ifa->tmp_next;
736 if (ifp->ifpub) {
737 in6_ifa_put(ifp->ifpub);
738 ifp->ifpub = NULL;
739 }
740 __in6_ifa_put(ifp);
741 ifa->tmp_next = NULL;
742 break;
743 }
744 }
745 }
746 #endif
747
748 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
749 if (ifa == ifp) {
750 *ifap = ifa->if_next;
751 __in6_ifa_put(ifp);
752 ifa->if_next = NULL;
753 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
754 break;
755 deleted = 1;
756 continue;
757 } else if (ifp->flags & IFA_F_PERMANENT) {
758 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
759 ifp->prefix_len)) {
760 if (ifa->flags & IFA_F_PERMANENT) {
761 onlink = 1;
762 if (deleted)
763 break;
764 } else {
765 unsigned long lifetime;
766
767 if (!onlink)
768 onlink = -1;
769
770 spin_lock(&ifa->lock);
771
772 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
773 /*
774 * Note: Because this address is
775 * not permanent, lifetime <
776 * LONG_MAX / HZ here.
777 */
778 if (time_before(expires,
779 ifa->tstamp + lifetime * HZ))
780 expires = ifa->tstamp + lifetime * HZ;
781 spin_unlock(&ifa->lock);
782 }
783 }
784 }
785 ifap = &ifa->if_next;
786 }
787 write_unlock_bh(&idev->lock);
788
789 addrconf_del_timer(ifp);
790
791 ipv6_ifa_notify(RTM_DELADDR, ifp);
792
793 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
794
795 /*
796 * Purge or update corresponding prefix
797 *
798 * 1) we don't purge prefix here if address was not permanent.
799 * prefix is managed by its own lifetime.
800 * 2) if there're no addresses, delete prefix.
801 * 3) if there're still other permanent address(es),
802 * corresponding prefix is still permanent.
803 * 4) otherwise, update prefix lifetime to the
804 * longest valid lifetime among the corresponding
805 * addresses on the device.
806 * Note: subsequent RA will update lifetime.
807 *
808 * --yoshfuji
809 */
810 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
811 struct in6_addr prefix;
812 struct rt6_info *rt;
813 struct net *net = dev_net(ifp->idev->dev);
814 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
815 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
816
817 if (rt && addrconf_is_prefix_route(rt)) {
818 if (onlink == 0) {
819 ip6_del_rt(rt);
820 rt = NULL;
821 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
822 rt->rt6i_expires = expires;
823 rt->rt6i_flags |= RTF_EXPIRES;
824 }
825 }
826 dst_release(&rt->u.dst);
827 }
828
829 in6_ifa_put(ifp);
830 }
831
832 #ifdef CONFIG_IPV6_PRIVACY
833 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
834 {
835 struct inet6_dev *idev = ifp->idev;
836 struct in6_addr addr, *tmpaddr;
837 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
838 unsigned long regen_advance;
839 int tmp_plen;
840 int ret = 0;
841 int max_addresses;
842 u32 addr_flags;
843
844 write_lock(&idev->lock);
845 if (ift) {
846 spin_lock_bh(&ift->lock);
847 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
848 spin_unlock_bh(&ift->lock);
849 tmpaddr = &addr;
850 } else {
851 tmpaddr = NULL;
852 }
853 retry:
854 in6_dev_hold(idev);
855 if (idev->cnf.use_tempaddr <= 0) {
856 write_unlock(&idev->lock);
857 printk(KERN_INFO
858 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
859 in6_dev_put(idev);
860 ret = -1;
861 goto out;
862 }
863 spin_lock_bh(&ifp->lock);
864 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
865 idev->cnf.use_tempaddr = -1; /*XXX*/
866 spin_unlock_bh(&ifp->lock);
867 write_unlock(&idev->lock);
868 printk(KERN_WARNING
869 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
870 in6_dev_put(idev);
871 ret = -1;
872 goto out;
873 }
874 in6_ifa_hold(ifp);
875 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
876 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
877 spin_unlock_bh(&ifp->lock);
878 write_unlock(&idev->lock);
879 printk(KERN_WARNING
880 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
881 in6_ifa_put(ifp);
882 in6_dev_put(idev);
883 ret = -1;
884 goto out;
885 }
886 memcpy(&addr.s6_addr[8], idev->rndid, 8);
887 tmp_valid_lft = min_t(__u32,
888 ifp->valid_lft,
889 idev->cnf.temp_valid_lft);
890 tmp_prefered_lft = min_t(__u32,
891 ifp->prefered_lft,
892 idev->cnf.temp_prefered_lft - desync_factor / HZ);
893 tmp_plen = ifp->prefix_len;
894 max_addresses = idev->cnf.max_addresses;
895 tmp_cstamp = ifp->cstamp;
896 tmp_tstamp = ifp->tstamp;
897 spin_unlock_bh(&ifp->lock);
898
899 regen_advance = idev->cnf.regen_max_retry *
900 idev->cnf.dad_transmits *
901 idev->nd_parms->retrans_time / HZ;
902 write_unlock(&idev->lock);
903
904 /* A temporary address is created only if this calculated Preferred
905 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
906 * an implementation must not create a temporary address with a zero
907 * Preferred Lifetime.
908 */
909 if (tmp_prefered_lft <= regen_advance) {
910 in6_ifa_put(ifp);
911 in6_dev_put(idev);
912 ret = -1;
913 goto out;
914 }
915
916 addr_flags = IFA_F_TEMPORARY;
917 /* set in addrconf_prefix_rcv() */
918 if (ifp->flags & IFA_F_OPTIMISTIC)
919 addr_flags |= IFA_F_OPTIMISTIC;
920
921 ift = !max_addresses ||
922 ipv6_count_addresses(idev) < max_addresses ?
923 ipv6_add_addr(idev, &addr, tmp_plen,
924 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
925 addr_flags) : NULL;
926 if (!ift || IS_ERR(ift)) {
927 in6_ifa_put(ifp);
928 in6_dev_put(idev);
929 printk(KERN_INFO
930 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
931 tmpaddr = &addr;
932 write_lock(&idev->lock);
933 goto retry;
934 }
935
936 spin_lock_bh(&ift->lock);
937 ift->ifpub = ifp;
938 ift->valid_lft = tmp_valid_lft;
939 ift->prefered_lft = tmp_prefered_lft;
940 ift->cstamp = tmp_cstamp;
941 ift->tstamp = tmp_tstamp;
942 spin_unlock_bh(&ift->lock);
943
944 addrconf_dad_start(ift, 0);
945 in6_ifa_put(ift);
946 in6_dev_put(idev);
947 out:
948 return ret;
949 }
950 #endif
951
952 /*
953 * Choose an appropriate source address (RFC3484)
954 */
955 enum {
956 IPV6_SADDR_RULE_INIT = 0,
957 IPV6_SADDR_RULE_LOCAL,
958 IPV6_SADDR_RULE_SCOPE,
959 IPV6_SADDR_RULE_PREFERRED,
960 #ifdef CONFIG_IPV6_MIP6
961 IPV6_SADDR_RULE_HOA,
962 #endif
963 IPV6_SADDR_RULE_OIF,
964 IPV6_SADDR_RULE_LABEL,
965 #ifdef CONFIG_IPV6_PRIVACY
966 IPV6_SADDR_RULE_PRIVACY,
967 #endif
968 IPV6_SADDR_RULE_ORCHID,
969 IPV6_SADDR_RULE_PREFIX,
970 IPV6_SADDR_RULE_MAX
971 };
972
973 struct ipv6_saddr_score {
974 int rule;
975 int addr_type;
976 struct inet6_ifaddr *ifa;
977 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
978 int scopedist;
979 int matchlen;
980 };
981
982 struct ipv6_saddr_dst {
983 const struct in6_addr *addr;
984 int ifindex;
985 int scope;
986 int label;
987 unsigned int prefs;
988 };
989
990 static inline int ipv6_saddr_preferred(int type)
991 {
992 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
993 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
994 return 1;
995 return 0;
996 }
997
998 static int ipv6_get_saddr_eval(struct net *net,
999 struct ipv6_saddr_score *score,
1000 struct ipv6_saddr_dst *dst,
1001 int i)
1002 {
1003 int ret;
1004
1005 if (i <= score->rule) {
1006 switch (i) {
1007 case IPV6_SADDR_RULE_SCOPE:
1008 ret = score->scopedist;
1009 break;
1010 case IPV6_SADDR_RULE_PREFIX:
1011 ret = score->matchlen;
1012 break;
1013 default:
1014 ret = !!test_bit(i, score->scorebits);
1015 }
1016 goto out;
1017 }
1018
1019 switch (i) {
1020 case IPV6_SADDR_RULE_INIT:
1021 /* Rule 0: remember if hiscore is not ready yet */
1022 ret = !!score->ifa;
1023 break;
1024 case IPV6_SADDR_RULE_LOCAL:
1025 /* Rule 1: Prefer same address */
1026 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1027 break;
1028 case IPV6_SADDR_RULE_SCOPE:
1029 /* Rule 2: Prefer appropriate scope
1030 *
1031 * ret
1032 * ^
1033 * -1 | d 15
1034 * ---+--+-+---> scope
1035 * |
1036 * | d is scope of the destination.
1037 * B-d | \
1038 * | \ <- smaller scope is better if
1039 * B-15 | \ if scope is enough for destinaion.
1040 * | ret = B - scope (-1 <= scope >= d <= 15).
1041 * d-C-1 | /
1042 * |/ <- greater is better
1043 * -C / if scope is not enough for destination.
1044 * /| ret = scope - C (-1 <= d < scope <= 15).
1045 *
1046 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1047 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1048 * Assume B = 0 and we get C > 29.
1049 */
1050 ret = __ipv6_addr_src_scope(score->addr_type);
1051 if (ret >= dst->scope)
1052 ret = -ret;
1053 else
1054 ret -= 128; /* 30 is enough */
1055 score->scopedist = ret;
1056 break;
1057 case IPV6_SADDR_RULE_PREFERRED:
1058 /* Rule 3: Avoid deprecated and optimistic addresses */
1059 ret = ipv6_saddr_preferred(score->addr_type) ||
1060 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1061 break;
1062 #ifdef CONFIG_IPV6_MIP6
1063 case IPV6_SADDR_RULE_HOA:
1064 {
1065 /* Rule 4: Prefer home address */
1066 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1067 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1068 break;
1069 }
1070 #endif
1071 case IPV6_SADDR_RULE_OIF:
1072 /* Rule 5: Prefer outgoing interface */
1073 ret = (!dst->ifindex ||
1074 dst->ifindex == score->ifa->idev->dev->ifindex);
1075 break;
1076 case IPV6_SADDR_RULE_LABEL:
1077 /* Rule 6: Prefer matching label */
1078 ret = ipv6_addr_label(net,
1079 &score->ifa->addr, score->addr_type,
1080 score->ifa->idev->dev->ifindex) == dst->label;
1081 break;
1082 #ifdef CONFIG_IPV6_PRIVACY
1083 case IPV6_SADDR_RULE_PRIVACY:
1084 {
1085 /* Rule 7: Prefer public address
1086 * Note: prefer temprary address if use_tempaddr >= 2
1087 */
1088 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1089 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1090 score->ifa->idev->cnf.use_tempaddr >= 2;
1091 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1092 break;
1093 }
1094 #endif
1095 case IPV6_SADDR_RULE_ORCHID:
1096 /* Rule 8-: Prefer ORCHID vs ORCHID or
1097 * non-ORCHID vs non-ORCHID
1098 */
1099 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1100 ipv6_addr_orchid(dst->addr));
1101 break;
1102 case IPV6_SADDR_RULE_PREFIX:
1103 /* Rule 8: Use longest matching prefix */
1104 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1105 dst->addr);
1106 break;
1107 default:
1108 ret = 0;
1109 }
1110
1111 if (ret)
1112 __set_bit(i, score->scorebits);
1113 score->rule = i;
1114 out:
1115 return ret;
1116 }
1117
1118 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1119 const struct in6_addr *daddr, unsigned int prefs,
1120 struct in6_addr *saddr)
1121 {
1122 struct ipv6_saddr_score scores[2],
1123 *score = &scores[0], *hiscore = &scores[1];
1124 struct ipv6_saddr_dst dst;
1125 struct net_device *dev;
1126 int dst_type;
1127
1128 dst_type = __ipv6_addr_type(daddr);
1129 dst.addr = daddr;
1130 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1131 dst.scope = __ipv6_addr_src_scope(dst_type);
1132 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1133 dst.prefs = prefs;
1134
1135 hiscore->rule = -1;
1136 hiscore->ifa = NULL;
1137
1138 read_lock(&dev_base_lock);
1139 rcu_read_lock();
1140
1141 for_each_netdev(net, dev) {
1142 struct inet6_dev *idev;
1143
1144 /* Candidate Source Address (section 4)
1145 * - multicast and link-local destination address,
1146 * the set of candidate source address MUST only
1147 * include addresses assigned to interfaces
1148 * belonging to the same link as the outgoing
1149 * interface.
1150 * (- For site-local destination addresses, the
1151 * set of candidate source addresses MUST only
1152 * include addresses assigned to interfaces
1153 * belonging to the same site as the outgoing
1154 * interface.)
1155 */
1156 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1157 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1158 dst.ifindex && dev->ifindex != dst.ifindex)
1159 continue;
1160
1161 idev = __in6_dev_get(dev);
1162 if (!idev)
1163 continue;
1164
1165 read_lock_bh(&idev->lock);
1166 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1167 int i;
1168
1169 /*
1170 * - Tentative Address (RFC2462 section 5.4)
1171 * - A tentative address is not considered
1172 * "assigned to an interface" in the traditional
1173 * sense, unless it is also flagged as optimistic.
1174 * - Candidate Source Address (section 4)
1175 * - In any case, anycast addresses, multicast
1176 * addresses, and the unspecified address MUST
1177 * NOT be included in a candidate set.
1178 */
1179 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1180 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1181 continue;
1182
1183 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1184
1185 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1186 score->addr_type & IPV6_ADDR_MULTICAST)) {
1187 LIMIT_NETDEBUG(KERN_DEBUG
1188 "ADDRCONF: unspecified / multicast address "
1189 "assigned as unicast address on %s",
1190 dev->name);
1191 continue;
1192 }
1193
1194 score->rule = -1;
1195 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1196
1197 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1198 int minihiscore, miniscore;
1199
1200 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1201 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1202
1203 if (minihiscore > miniscore) {
1204 if (i == IPV6_SADDR_RULE_SCOPE &&
1205 score->scopedist > 0) {
1206 /*
1207 * special case:
1208 * each remaining entry
1209 * has too small (not enough)
1210 * scope, because ifa entries
1211 * are sorted by their scope
1212 * values.
1213 */
1214 goto try_nextdev;
1215 }
1216 break;
1217 } else if (minihiscore < miniscore) {
1218 if (hiscore->ifa)
1219 in6_ifa_put(hiscore->ifa);
1220
1221 in6_ifa_hold(score->ifa);
1222
1223 swap(hiscore, score);
1224
1225 /* restore our iterator */
1226 score->ifa = hiscore->ifa;
1227
1228 break;
1229 }
1230 }
1231 }
1232 try_nextdev:
1233 read_unlock_bh(&idev->lock);
1234 }
1235 rcu_read_unlock();
1236 read_unlock(&dev_base_lock);
1237
1238 if (!hiscore->ifa)
1239 return -EADDRNOTAVAIL;
1240
1241 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1242 in6_ifa_put(hiscore->ifa);
1243 return 0;
1244 }
1245
1246 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1247
1248 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1249 unsigned char banned_flags)
1250 {
1251 struct inet6_dev *idev;
1252 int err = -EADDRNOTAVAIL;
1253
1254 rcu_read_lock();
1255 if ((idev = __in6_dev_get(dev)) != NULL) {
1256 struct inet6_ifaddr *ifp;
1257
1258 read_lock_bh(&idev->lock);
1259 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1260 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1261 ipv6_addr_copy(addr, &ifp->addr);
1262 err = 0;
1263 break;
1264 }
1265 }
1266 read_unlock_bh(&idev->lock);
1267 }
1268 rcu_read_unlock();
1269 return err;
1270 }
1271
1272 static int ipv6_count_addresses(struct inet6_dev *idev)
1273 {
1274 int cnt = 0;
1275 struct inet6_ifaddr *ifp;
1276
1277 read_lock_bh(&idev->lock);
1278 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1279 cnt++;
1280 read_unlock_bh(&idev->lock);
1281 return cnt;
1282 }
1283
1284 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1285 struct net_device *dev, int strict)
1286 {
1287 struct inet6_ifaddr * ifp;
1288 u8 hash = ipv6_addr_hash(addr);
1289
1290 read_lock_bh(&addrconf_hash_lock);
1291 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1292 if (!net_eq(dev_net(ifp->idev->dev), net))
1293 continue;
1294 if (ipv6_addr_equal(&ifp->addr, addr) &&
1295 !(ifp->flags&IFA_F_TENTATIVE)) {
1296 if (dev == NULL || ifp->idev->dev == dev ||
1297 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1298 break;
1299 }
1300 }
1301 read_unlock_bh(&addrconf_hash_lock);
1302 return ifp != NULL;
1303 }
1304 EXPORT_SYMBOL(ipv6_chk_addr);
1305
1306 static
1307 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1308 struct net_device *dev)
1309 {
1310 struct inet6_ifaddr * ifp;
1311 u8 hash = ipv6_addr_hash(addr);
1312
1313 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1314 if (!net_eq(dev_net(ifp->idev->dev), net))
1315 continue;
1316 if (ipv6_addr_equal(&ifp->addr, addr)) {
1317 if (dev == NULL || ifp->idev->dev == dev)
1318 break;
1319 }
1320 }
1321 return ifp != NULL;
1322 }
1323
1324 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1325 {
1326 struct inet6_dev *idev;
1327 struct inet6_ifaddr *ifa;
1328 int onlink;
1329
1330 onlink = 0;
1331 rcu_read_lock();
1332 idev = __in6_dev_get(dev);
1333 if (idev) {
1334 read_lock_bh(&idev->lock);
1335 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1336 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1337 ifa->prefix_len);
1338 if (onlink)
1339 break;
1340 }
1341 read_unlock_bh(&idev->lock);
1342 }
1343 rcu_read_unlock();
1344 return onlink;
1345 }
1346
1347 EXPORT_SYMBOL(ipv6_chk_prefix);
1348
1349 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1350 struct net_device *dev, int strict)
1351 {
1352 struct inet6_ifaddr * ifp;
1353 u8 hash = ipv6_addr_hash(addr);
1354
1355 read_lock_bh(&addrconf_hash_lock);
1356 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1357 if (!net_eq(dev_net(ifp->idev->dev), net))
1358 continue;
1359 if (ipv6_addr_equal(&ifp->addr, addr)) {
1360 if (dev == NULL || ifp->idev->dev == dev ||
1361 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1362 in6_ifa_hold(ifp);
1363 break;
1364 }
1365 }
1366 }
1367 read_unlock_bh(&addrconf_hash_lock);
1368
1369 return ifp;
1370 }
1371
1372 /* Gets referenced address, destroys ifaddr */
1373
1374 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1375 {
1376 if (ifp->flags&IFA_F_PERMANENT) {
1377 spin_lock_bh(&ifp->lock);
1378 addrconf_del_timer(ifp);
1379 ifp->flags |= IFA_F_TENTATIVE;
1380 if (dad_failed)
1381 ifp->flags |= IFA_F_DADFAILED;
1382 spin_unlock_bh(&ifp->lock);
1383 in6_ifa_put(ifp);
1384 #ifdef CONFIG_IPV6_PRIVACY
1385 } else if (ifp->flags&IFA_F_TEMPORARY) {
1386 struct inet6_ifaddr *ifpub;
1387 spin_lock_bh(&ifp->lock);
1388 ifpub = ifp->ifpub;
1389 if (ifpub) {
1390 in6_ifa_hold(ifpub);
1391 spin_unlock_bh(&ifp->lock);
1392 ipv6_create_tempaddr(ifpub, ifp);
1393 in6_ifa_put(ifpub);
1394 } else {
1395 spin_unlock_bh(&ifp->lock);
1396 }
1397 ipv6_del_addr(ifp);
1398 #endif
1399 } else
1400 ipv6_del_addr(ifp);
1401 }
1402
1403 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1404 {
1405 struct inet6_dev *idev = ifp->idev;
1406
1407 if (net_ratelimit())
1408 printk(KERN_INFO "%s: IPv6 duplicate address detected!\n",
1409 ifp->idev->dev->name);
1410
1411 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1412 struct in6_addr addr;
1413
1414 addr.s6_addr32[0] = htonl(0xfe800000);
1415 addr.s6_addr32[1] = 0;
1416
1417 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1418 ipv6_addr_equal(&ifp->addr, &addr)) {
1419 /* DAD failed for link-local based on MAC address */
1420 idev->cnf.disable_ipv6 = 1;
1421
1422 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1423 ifp->idev->dev->name);
1424 }
1425 }
1426
1427 addrconf_dad_stop(ifp, 1);
1428 }
1429
1430 /* Join to solicited addr multicast group. */
1431
1432 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1433 {
1434 struct in6_addr maddr;
1435
1436 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1437 return;
1438
1439 addrconf_addr_solict_mult(addr, &maddr);
1440 ipv6_dev_mc_inc(dev, &maddr);
1441 }
1442
1443 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1444 {
1445 struct in6_addr maddr;
1446
1447 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1448 return;
1449
1450 addrconf_addr_solict_mult(addr, &maddr);
1451 __ipv6_dev_mc_dec(idev, &maddr);
1452 }
1453
1454 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1455 {
1456 struct in6_addr addr;
1457 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1458 if (ipv6_addr_any(&addr))
1459 return;
1460 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1461 }
1462
1463 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1464 {
1465 struct in6_addr addr;
1466 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1467 if (ipv6_addr_any(&addr))
1468 return;
1469 __ipv6_dev_ac_dec(ifp->idev, &addr);
1470 }
1471
1472 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1473 {
1474 if (dev->addr_len != ETH_ALEN)
1475 return -1;
1476 memcpy(eui, dev->dev_addr, 3);
1477 memcpy(eui + 5, dev->dev_addr + 3, 3);
1478
1479 /*
1480 * The zSeries OSA network cards can be shared among various
1481 * OS instances, but the OSA cards have only one MAC address.
1482 * This leads to duplicate address conflicts in conjunction
1483 * with IPv6 if more than one instance uses the same card.
1484 *
1485 * The driver for these cards can deliver a unique 16-bit
1486 * identifier for each instance sharing the same card. It is
1487 * placed instead of 0xFFFE in the interface identifier. The
1488 * "u" bit of the interface identifier is not inverted in this
1489 * case. Hence the resulting interface identifier has local
1490 * scope according to RFC2373.
1491 */
1492 if (dev->dev_id) {
1493 eui[3] = (dev->dev_id >> 8) & 0xFF;
1494 eui[4] = dev->dev_id & 0xFF;
1495 } else {
1496 eui[3] = 0xFF;
1497 eui[4] = 0xFE;
1498 eui[0] ^= 2;
1499 }
1500 return 0;
1501 }
1502
1503 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1504 {
1505 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1506 if (dev->addr_len != ARCNET_ALEN)
1507 return -1;
1508 memset(eui, 0, 7);
1509 eui[7] = *(u8*)dev->dev_addr;
1510 return 0;
1511 }
1512
1513 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1514 {
1515 if (dev->addr_len != INFINIBAND_ALEN)
1516 return -1;
1517 memcpy(eui, dev->dev_addr + 12, 8);
1518 eui[0] |= 2;
1519 return 0;
1520 }
1521
1522 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1523 {
1524 if (addr == 0)
1525 return -1;
1526 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1527 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1528 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1529 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1530 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1531 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1532 eui[1] = 0;
1533 eui[2] = 0x5E;
1534 eui[3] = 0xFE;
1535 memcpy(eui + 4, &addr, 4);
1536 return 0;
1537 }
1538 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1539
1540 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1541 {
1542 if (dev->priv_flags & IFF_ISATAP)
1543 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1544 return -1;
1545 }
1546
1547 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1548 {
1549 switch (dev->type) {
1550 case ARPHRD_ETHER:
1551 case ARPHRD_FDDI:
1552 case ARPHRD_IEEE802_TR:
1553 return addrconf_ifid_eui48(eui, dev);
1554 case ARPHRD_ARCNET:
1555 return addrconf_ifid_arcnet(eui, dev);
1556 case ARPHRD_INFINIBAND:
1557 return addrconf_ifid_infiniband(eui, dev);
1558 case ARPHRD_SIT:
1559 return addrconf_ifid_sit(eui, dev);
1560 }
1561 return -1;
1562 }
1563
1564 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1565 {
1566 int err = -1;
1567 struct inet6_ifaddr *ifp;
1568
1569 read_lock_bh(&idev->lock);
1570 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1571 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1572 memcpy(eui, ifp->addr.s6_addr+8, 8);
1573 err = 0;
1574 break;
1575 }
1576 }
1577 read_unlock_bh(&idev->lock);
1578 return err;
1579 }
1580
1581 #ifdef CONFIG_IPV6_PRIVACY
1582 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1583 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1584 {
1585 regen:
1586 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1587 idev->rndid[0] &= ~0x02;
1588
1589 /*
1590 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1591 * check if generated address is not inappropriate
1592 *
1593 * - Reserved subnet anycast (RFC 2526)
1594 * 11111101 11....11 1xxxxxxx
1595 * - ISATAP (RFC4214) 6.1
1596 * 00-00-5E-FE-xx-xx-xx-xx
1597 * - value 0
1598 * - XXX: already assigned to an address on the device
1599 */
1600 if (idev->rndid[0] == 0xfd &&
1601 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1602 (idev->rndid[7]&0x80))
1603 goto regen;
1604 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1605 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1606 goto regen;
1607 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1608 goto regen;
1609 }
1610
1611 return 0;
1612 }
1613
1614 static void ipv6_regen_rndid(unsigned long data)
1615 {
1616 struct inet6_dev *idev = (struct inet6_dev *) data;
1617 unsigned long expires;
1618
1619 rcu_read_lock_bh();
1620 write_lock_bh(&idev->lock);
1621
1622 if (idev->dead)
1623 goto out;
1624
1625 if (__ipv6_regen_rndid(idev) < 0)
1626 goto out;
1627
1628 expires = jiffies +
1629 idev->cnf.temp_prefered_lft * HZ -
1630 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1631 if (time_before(expires, jiffies)) {
1632 printk(KERN_WARNING
1633 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1634 idev->dev->name);
1635 goto out;
1636 }
1637
1638 if (!mod_timer(&idev->regen_timer, expires))
1639 in6_dev_hold(idev);
1640
1641 out:
1642 write_unlock_bh(&idev->lock);
1643 rcu_read_unlock_bh();
1644 in6_dev_put(idev);
1645 }
1646
1647 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1648 int ret = 0;
1649
1650 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1651 ret = __ipv6_regen_rndid(idev);
1652 return ret;
1653 }
1654 #endif
1655
1656 /*
1657 * Add prefix route.
1658 */
1659
1660 static void
1661 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1662 unsigned long expires, u32 flags)
1663 {
1664 struct fib6_config cfg = {
1665 .fc_table = RT6_TABLE_PREFIX,
1666 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1667 .fc_ifindex = dev->ifindex,
1668 .fc_expires = expires,
1669 .fc_dst_len = plen,
1670 .fc_flags = RTF_UP | flags,
1671 .fc_nlinfo.nl_net = dev_net(dev),
1672 .fc_protocol = RTPROT_KERNEL,
1673 };
1674
1675 ipv6_addr_copy(&cfg.fc_dst, pfx);
1676
1677 /* Prevent useless cloning on PtP SIT.
1678 This thing is done here expecting that the whole
1679 class of non-broadcast devices need not cloning.
1680 */
1681 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1682 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1683 cfg.fc_flags |= RTF_NONEXTHOP;
1684 #endif
1685
1686 ip6_route_add(&cfg);
1687 }
1688
1689 /* Create "default" multicast route to the interface */
1690
1691 static void addrconf_add_mroute(struct net_device *dev)
1692 {
1693 struct fib6_config cfg = {
1694 .fc_table = RT6_TABLE_LOCAL,
1695 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1696 .fc_ifindex = dev->ifindex,
1697 .fc_dst_len = 8,
1698 .fc_flags = RTF_UP,
1699 .fc_nlinfo.nl_net = dev_net(dev),
1700 };
1701
1702 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1703
1704 ip6_route_add(&cfg);
1705 }
1706
1707 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1708 static void sit_route_add(struct net_device *dev)
1709 {
1710 struct fib6_config cfg = {
1711 .fc_table = RT6_TABLE_MAIN,
1712 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1713 .fc_ifindex = dev->ifindex,
1714 .fc_dst_len = 96,
1715 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1716 .fc_nlinfo.nl_net = dev_net(dev),
1717 };
1718
1719 /* prefix length - 96 bits "::d.d.d.d" */
1720 ip6_route_add(&cfg);
1721 }
1722 #endif
1723
1724 static void addrconf_add_lroute(struct net_device *dev)
1725 {
1726 struct in6_addr addr;
1727
1728 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1729 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1730 }
1731
1732 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1733 {
1734 struct inet6_dev *idev;
1735
1736 ASSERT_RTNL();
1737
1738 if ((idev = ipv6_find_idev(dev)) == NULL)
1739 return NULL;
1740
1741 /* Add default multicast route */
1742 addrconf_add_mroute(dev);
1743
1744 /* Add link local route */
1745 addrconf_add_lroute(dev);
1746 return idev;
1747 }
1748
1749 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1750 {
1751 struct prefix_info *pinfo;
1752 __u32 valid_lft;
1753 __u32 prefered_lft;
1754 int addr_type;
1755 struct inet6_dev *in6_dev;
1756 struct net *net = dev_net(dev);
1757
1758 pinfo = (struct prefix_info *) opt;
1759
1760 if (len < sizeof(struct prefix_info)) {
1761 ADBG(("addrconf: prefix option too short\n"));
1762 return;
1763 }
1764
1765 /*
1766 * Validation checks ([ADDRCONF], page 19)
1767 */
1768
1769 addr_type = ipv6_addr_type(&pinfo->prefix);
1770
1771 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1772 return;
1773
1774 valid_lft = ntohl(pinfo->valid);
1775 prefered_lft = ntohl(pinfo->prefered);
1776
1777 if (prefered_lft > valid_lft) {
1778 if (net_ratelimit())
1779 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1780 return;
1781 }
1782
1783 in6_dev = in6_dev_get(dev);
1784
1785 if (in6_dev == NULL) {
1786 if (net_ratelimit())
1787 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1788 return;
1789 }
1790
1791 /*
1792 * Two things going on here:
1793 * 1) Add routes for on-link prefixes
1794 * 2) Configure prefixes with the auto flag set
1795 */
1796
1797 if (pinfo->onlink) {
1798 struct rt6_info *rt;
1799 unsigned long rt_expires;
1800
1801 /* Avoid arithmetic overflow. Really, we could
1802 * save rt_expires in seconds, likely valid_lft,
1803 * but it would require division in fib gc, that it
1804 * not good.
1805 */
1806 if (HZ > USER_HZ)
1807 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1808 else
1809 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1810
1811 if (addrconf_finite_timeout(rt_expires))
1812 rt_expires *= HZ;
1813
1814 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1815 dev->ifindex, 1);
1816
1817 if (rt && addrconf_is_prefix_route(rt)) {
1818 /* Autoconf prefix route */
1819 if (valid_lft == 0) {
1820 ip6_del_rt(rt);
1821 rt = NULL;
1822 } else if (addrconf_finite_timeout(rt_expires)) {
1823 /* not infinity */
1824 rt->rt6i_expires = jiffies + rt_expires;
1825 rt->rt6i_flags |= RTF_EXPIRES;
1826 } else {
1827 rt->rt6i_flags &= ~RTF_EXPIRES;
1828 rt->rt6i_expires = 0;
1829 }
1830 } else if (valid_lft) {
1831 clock_t expires = 0;
1832 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1833 if (addrconf_finite_timeout(rt_expires)) {
1834 /* not infinity */
1835 flags |= RTF_EXPIRES;
1836 expires = jiffies_to_clock_t(rt_expires);
1837 }
1838 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1839 dev, expires, flags);
1840 }
1841 if (rt)
1842 dst_release(&rt->u.dst);
1843 }
1844
1845 /* Try to figure out our local address for this prefix */
1846
1847 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1848 struct inet6_ifaddr * ifp;
1849 struct in6_addr addr;
1850 int create = 0, update_lft = 0;
1851
1852 if (pinfo->prefix_len == 64) {
1853 memcpy(&addr, &pinfo->prefix, 8);
1854 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1855 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1856 in6_dev_put(in6_dev);
1857 return;
1858 }
1859 goto ok;
1860 }
1861 if (net_ratelimit())
1862 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1863 pinfo->prefix_len);
1864 in6_dev_put(in6_dev);
1865 return;
1866
1867 ok:
1868
1869 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1870
1871 if (ifp == NULL && valid_lft) {
1872 int max_addresses = in6_dev->cnf.max_addresses;
1873 u32 addr_flags = 0;
1874
1875 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1876 if (in6_dev->cnf.optimistic_dad &&
1877 !net->ipv6.devconf_all->forwarding)
1878 addr_flags = IFA_F_OPTIMISTIC;
1879 #endif
1880
1881 /* Do not allow to create too much of autoconfigured
1882 * addresses; this would be too easy way to crash kernel.
1883 */
1884 if (!max_addresses ||
1885 ipv6_count_addresses(in6_dev) < max_addresses)
1886 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1887 addr_type&IPV6_ADDR_SCOPE_MASK,
1888 addr_flags);
1889
1890 if (!ifp || IS_ERR(ifp)) {
1891 in6_dev_put(in6_dev);
1892 return;
1893 }
1894
1895 update_lft = create = 1;
1896 ifp->cstamp = jiffies;
1897 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1898 }
1899
1900 if (ifp) {
1901 int flags;
1902 unsigned long now;
1903 #ifdef CONFIG_IPV6_PRIVACY
1904 struct inet6_ifaddr *ift;
1905 #endif
1906 u32 stored_lft;
1907
1908 /* update lifetime (RFC2462 5.5.3 e) */
1909 spin_lock(&ifp->lock);
1910 now = jiffies;
1911 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1912 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1913 else
1914 stored_lft = 0;
1915 if (!update_lft && stored_lft) {
1916 if (valid_lft > MIN_VALID_LIFETIME ||
1917 valid_lft > stored_lft)
1918 update_lft = 1;
1919 else if (stored_lft <= MIN_VALID_LIFETIME) {
1920 /* valid_lft <= stored_lft is always true */
1921 /*
1922 * RFC 4862 Section 5.5.3e:
1923 * "Note that the preferred lifetime of
1924 * the corresponding address is always
1925 * reset to the Preferred Lifetime in
1926 * the received Prefix Information
1927 * option, regardless of whether the
1928 * valid lifetime is also reset or
1929 * ignored."
1930 *
1931 * So if the preferred lifetime in
1932 * this advertisement is different
1933 * than what we have stored, but the
1934 * valid lifetime is invalid, just
1935 * reset prefered_lft.
1936 *
1937 * We must set the valid lifetime
1938 * to the stored lifetime since we'll
1939 * be updating the timestamp below,
1940 * else we'll set it back to the
1941 * minumum.
1942 */
1943 if (prefered_lft != ifp->prefered_lft) {
1944 valid_lft = stored_lft;
1945 update_lft = 1;
1946 }
1947 } else {
1948 valid_lft = MIN_VALID_LIFETIME;
1949 if (valid_lft < prefered_lft)
1950 prefered_lft = valid_lft;
1951 update_lft = 1;
1952 }
1953 }
1954
1955 if (update_lft) {
1956 ifp->valid_lft = valid_lft;
1957 ifp->prefered_lft = prefered_lft;
1958 ifp->tstamp = now;
1959 flags = ifp->flags;
1960 ifp->flags &= ~IFA_F_DEPRECATED;
1961 spin_unlock(&ifp->lock);
1962
1963 if (!(flags&IFA_F_TENTATIVE))
1964 ipv6_ifa_notify(0, ifp);
1965 } else
1966 spin_unlock(&ifp->lock);
1967
1968 #ifdef CONFIG_IPV6_PRIVACY
1969 read_lock_bh(&in6_dev->lock);
1970 /* update all temporary addresses in the list */
1971 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1972 /*
1973 * When adjusting the lifetimes of an existing
1974 * temporary address, only lower the lifetimes.
1975 * Implementations must not increase the
1976 * lifetimes of an existing temporary address
1977 * when processing a Prefix Information Option.
1978 */
1979 if (ifp != ift->ifpub)
1980 continue;
1981
1982 spin_lock(&ift->lock);
1983 flags = ift->flags;
1984 if (ift->valid_lft > valid_lft &&
1985 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1986 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1987 if (ift->prefered_lft > prefered_lft &&
1988 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1989 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1990 spin_unlock(&ift->lock);
1991 if (!(flags&IFA_F_TENTATIVE))
1992 ipv6_ifa_notify(0, ift);
1993 }
1994
1995 if (create && in6_dev->cnf.use_tempaddr > 0) {
1996 /*
1997 * When a new public address is created as described in [ADDRCONF],
1998 * also create a new temporary address.
1999 */
2000 read_unlock_bh(&in6_dev->lock);
2001 ipv6_create_tempaddr(ifp, NULL);
2002 } else {
2003 read_unlock_bh(&in6_dev->lock);
2004 }
2005 #endif
2006 in6_ifa_put(ifp);
2007 addrconf_verify(0);
2008 }
2009 }
2010 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2011 in6_dev_put(in6_dev);
2012 }
2013
2014 /*
2015 * Set destination address.
2016 * Special case for SIT interfaces where we create a new "virtual"
2017 * device.
2018 */
2019 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2020 {
2021 struct in6_ifreq ireq;
2022 struct net_device *dev;
2023 int err = -EINVAL;
2024
2025 rtnl_lock();
2026
2027 err = -EFAULT;
2028 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2029 goto err_exit;
2030
2031 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2032
2033 err = -ENODEV;
2034 if (dev == NULL)
2035 goto err_exit;
2036
2037 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2038 if (dev->type == ARPHRD_SIT) {
2039 const struct net_device_ops *ops = dev->netdev_ops;
2040 struct ifreq ifr;
2041 struct ip_tunnel_parm p;
2042
2043 err = -EADDRNOTAVAIL;
2044 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2045 goto err_exit;
2046
2047 memset(&p, 0, sizeof(p));
2048 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2049 p.iph.saddr = 0;
2050 p.iph.version = 4;
2051 p.iph.ihl = 5;
2052 p.iph.protocol = IPPROTO_IPV6;
2053 p.iph.ttl = 64;
2054 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2055
2056 if (ops->ndo_do_ioctl) {
2057 mm_segment_t oldfs = get_fs();
2058
2059 set_fs(KERNEL_DS);
2060 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2061 set_fs(oldfs);
2062 } else
2063 err = -EOPNOTSUPP;
2064
2065 if (err == 0) {
2066 err = -ENOBUFS;
2067 dev = __dev_get_by_name(net, p.name);
2068 if (!dev)
2069 goto err_exit;
2070 err = dev_open(dev);
2071 }
2072 }
2073 #endif
2074
2075 err_exit:
2076 rtnl_unlock();
2077 return err;
2078 }
2079
2080 /*
2081 * Manual configuration of address on an interface
2082 */
2083 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2084 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2085 __u32 valid_lft)
2086 {
2087 struct inet6_ifaddr *ifp;
2088 struct inet6_dev *idev;
2089 struct net_device *dev;
2090 int scope;
2091 u32 flags;
2092 clock_t expires;
2093 unsigned long timeout;
2094
2095 ASSERT_RTNL();
2096
2097 if (plen > 128)
2098 return -EINVAL;
2099
2100 /* check the lifetime */
2101 if (!valid_lft || prefered_lft > valid_lft)
2102 return -EINVAL;
2103
2104 dev = __dev_get_by_index(net, ifindex);
2105 if (!dev)
2106 return -ENODEV;
2107
2108 if ((idev = addrconf_add_dev(dev)) == NULL)
2109 return -ENOBUFS;
2110
2111 scope = ipv6_addr_scope(pfx);
2112
2113 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2114 if (addrconf_finite_timeout(timeout)) {
2115 expires = jiffies_to_clock_t(timeout * HZ);
2116 valid_lft = timeout;
2117 flags = RTF_EXPIRES;
2118 } else {
2119 expires = 0;
2120 flags = 0;
2121 ifa_flags |= IFA_F_PERMANENT;
2122 }
2123
2124 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2125 if (addrconf_finite_timeout(timeout)) {
2126 if (timeout == 0)
2127 ifa_flags |= IFA_F_DEPRECATED;
2128 prefered_lft = timeout;
2129 }
2130
2131 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2132
2133 if (!IS_ERR(ifp)) {
2134 spin_lock_bh(&ifp->lock);
2135 ifp->valid_lft = valid_lft;
2136 ifp->prefered_lft = prefered_lft;
2137 ifp->tstamp = jiffies;
2138 spin_unlock_bh(&ifp->lock);
2139
2140 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2141 expires, flags);
2142 /*
2143 * Note that section 3.1 of RFC 4429 indicates
2144 * that the Optimistic flag should not be set for
2145 * manually configured addresses
2146 */
2147 addrconf_dad_start(ifp, 0);
2148 in6_ifa_put(ifp);
2149 addrconf_verify(0);
2150 return 0;
2151 }
2152
2153 return PTR_ERR(ifp);
2154 }
2155
2156 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2157 unsigned int plen)
2158 {
2159 struct inet6_ifaddr *ifp;
2160 struct inet6_dev *idev;
2161 struct net_device *dev;
2162
2163 if (plen > 128)
2164 return -EINVAL;
2165
2166 dev = __dev_get_by_index(net, ifindex);
2167 if (!dev)
2168 return -ENODEV;
2169
2170 if ((idev = __in6_dev_get(dev)) == NULL)
2171 return -ENXIO;
2172
2173 read_lock_bh(&idev->lock);
2174 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2175 if (ifp->prefix_len == plen &&
2176 ipv6_addr_equal(pfx, &ifp->addr)) {
2177 in6_ifa_hold(ifp);
2178 read_unlock_bh(&idev->lock);
2179
2180 ipv6_del_addr(ifp);
2181
2182 /* If the last address is deleted administratively,
2183 disable IPv6 on this interface.
2184 */
2185 if (idev->addr_list == NULL)
2186 addrconf_ifdown(idev->dev, 1);
2187 return 0;
2188 }
2189 }
2190 read_unlock_bh(&idev->lock);
2191 return -EADDRNOTAVAIL;
2192 }
2193
2194
2195 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2196 {
2197 struct in6_ifreq ireq;
2198 int err;
2199
2200 if (!capable(CAP_NET_ADMIN))
2201 return -EPERM;
2202
2203 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2204 return -EFAULT;
2205
2206 rtnl_lock();
2207 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2208 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2209 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2210 rtnl_unlock();
2211 return err;
2212 }
2213
2214 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2215 {
2216 struct in6_ifreq ireq;
2217 int err;
2218
2219 if (!capable(CAP_NET_ADMIN))
2220 return -EPERM;
2221
2222 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2223 return -EFAULT;
2224
2225 rtnl_lock();
2226 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2227 ireq.ifr6_prefixlen);
2228 rtnl_unlock();
2229 return err;
2230 }
2231
2232 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2233 int plen, int scope)
2234 {
2235 struct inet6_ifaddr *ifp;
2236
2237 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2238 if (!IS_ERR(ifp)) {
2239 spin_lock_bh(&ifp->lock);
2240 ifp->flags &= ~IFA_F_TENTATIVE;
2241 spin_unlock_bh(&ifp->lock);
2242 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2243 in6_ifa_put(ifp);
2244 }
2245 }
2246
2247 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2248 static void sit_add_v4_addrs(struct inet6_dev *idev)
2249 {
2250 struct in6_addr addr;
2251 struct net_device *dev;
2252 struct net *net = dev_net(idev->dev);
2253 int scope;
2254
2255 ASSERT_RTNL();
2256
2257 memset(&addr, 0, sizeof(struct in6_addr));
2258 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2259
2260 if (idev->dev->flags&IFF_POINTOPOINT) {
2261 addr.s6_addr32[0] = htonl(0xfe800000);
2262 scope = IFA_LINK;
2263 } else {
2264 scope = IPV6_ADDR_COMPATv4;
2265 }
2266
2267 if (addr.s6_addr32[3]) {
2268 add_addr(idev, &addr, 128, scope);
2269 return;
2270 }
2271
2272 for_each_netdev(net, dev) {
2273 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2274 if (in_dev && (dev->flags & IFF_UP)) {
2275 struct in_ifaddr * ifa;
2276
2277 int flag = scope;
2278
2279 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2280 int plen;
2281
2282 addr.s6_addr32[3] = ifa->ifa_local;
2283
2284 if (ifa->ifa_scope == RT_SCOPE_LINK)
2285 continue;
2286 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2287 if (idev->dev->flags&IFF_POINTOPOINT)
2288 continue;
2289 flag |= IFA_HOST;
2290 }
2291 if (idev->dev->flags&IFF_POINTOPOINT)
2292 plen = 64;
2293 else
2294 plen = 96;
2295
2296 add_addr(idev, &addr, plen, flag);
2297 }
2298 }
2299 }
2300 }
2301 #endif
2302
2303 static void init_loopback(struct net_device *dev)
2304 {
2305 struct inet6_dev *idev;
2306
2307 /* ::1 */
2308
2309 ASSERT_RTNL();
2310
2311 if ((idev = ipv6_find_idev(dev)) == NULL) {
2312 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2313 return;
2314 }
2315
2316 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2317 }
2318
2319 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2320 {
2321 struct inet6_ifaddr * ifp;
2322 u32 addr_flags = IFA_F_PERMANENT;
2323
2324 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2325 if (idev->cnf.optimistic_dad &&
2326 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2327 addr_flags |= IFA_F_OPTIMISTIC;
2328 #endif
2329
2330
2331 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2332 if (!IS_ERR(ifp)) {
2333 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2334 addrconf_dad_start(ifp, 0);
2335 in6_ifa_put(ifp);
2336 }
2337 }
2338
2339 static void addrconf_dev_config(struct net_device *dev)
2340 {
2341 struct in6_addr addr;
2342 struct inet6_dev * idev;
2343
2344 ASSERT_RTNL();
2345
2346 if ((dev->type != ARPHRD_ETHER) &&
2347 (dev->type != ARPHRD_FDDI) &&
2348 (dev->type != ARPHRD_IEEE802_TR) &&
2349 (dev->type != ARPHRD_ARCNET) &&
2350 (dev->type != ARPHRD_INFINIBAND)) {
2351 /* Alas, we support only Ethernet autoconfiguration. */
2352 return;
2353 }
2354
2355 idev = addrconf_add_dev(dev);
2356 if (idev == NULL)
2357 return;
2358
2359 memset(&addr, 0, sizeof(struct in6_addr));
2360 addr.s6_addr32[0] = htonl(0xFE800000);
2361
2362 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2363 addrconf_add_linklocal(idev, &addr);
2364 }
2365
2366 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2367 static void addrconf_sit_config(struct net_device *dev)
2368 {
2369 struct inet6_dev *idev;
2370
2371 ASSERT_RTNL();
2372
2373 /*
2374 * Configure the tunnel with one of our IPv4
2375 * addresses... we should configure all of
2376 * our v4 addrs in the tunnel
2377 */
2378
2379 if ((idev = ipv6_find_idev(dev)) == NULL) {
2380 printk(KERN_DEBUG "init sit: add_dev failed\n");
2381 return;
2382 }
2383
2384 if (dev->priv_flags & IFF_ISATAP) {
2385 struct in6_addr addr;
2386
2387 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2388 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2389 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2390 addrconf_add_linklocal(idev, &addr);
2391 return;
2392 }
2393
2394 sit_add_v4_addrs(idev);
2395
2396 if (dev->flags&IFF_POINTOPOINT) {
2397 addrconf_add_mroute(dev);
2398 addrconf_add_lroute(dev);
2399 } else
2400 sit_route_add(dev);
2401 }
2402 #endif
2403
2404 static inline int
2405 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2406 {
2407 struct in6_addr lladdr;
2408
2409 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2410 addrconf_add_linklocal(idev, &lladdr);
2411 return 0;
2412 }
2413 return -1;
2414 }
2415
2416 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2417 {
2418 struct net_device *link_dev;
2419 struct net *net = dev_net(idev->dev);
2420
2421 /* first try to inherit the link-local address from the link device */
2422 if (idev->dev->iflink &&
2423 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2424 if (!ipv6_inherit_linklocal(idev, link_dev))
2425 return;
2426 }
2427 /* then try to inherit it from any device */
2428 for_each_netdev(net, link_dev) {
2429 if (!ipv6_inherit_linklocal(idev, link_dev))
2430 return;
2431 }
2432 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2433 }
2434
2435 /*
2436 * Autoconfigure tunnel with a link-local address so routing protocols,
2437 * DHCPv6, MLD etc. can be run over the virtual link
2438 */
2439
2440 static void addrconf_ip6_tnl_config(struct net_device *dev)
2441 {
2442 struct inet6_dev *idev;
2443
2444 ASSERT_RTNL();
2445
2446 if ((idev = addrconf_add_dev(dev)) == NULL) {
2447 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2448 return;
2449 }
2450 ip6_tnl_add_linklocal(idev);
2451 }
2452
2453 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2454 void * data)
2455 {
2456 struct net_device *dev = (struct net_device *) data;
2457 struct inet6_dev *idev = __in6_dev_get(dev);
2458 int run_pending = 0;
2459 int err;
2460
2461 switch(event) {
2462 case NETDEV_REGISTER:
2463 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2464 idev = ipv6_add_dev(dev);
2465 if (!idev)
2466 return notifier_from_errno(-ENOMEM);
2467 }
2468 break;
2469 case NETDEV_UP:
2470 case NETDEV_CHANGE:
2471 if (dev->flags & IFF_SLAVE)
2472 break;
2473
2474 if (event == NETDEV_UP) {
2475 if (!addrconf_qdisc_ok(dev)) {
2476 /* device is not ready yet. */
2477 printk(KERN_INFO
2478 "ADDRCONF(NETDEV_UP): %s: "
2479 "link is not ready\n",
2480 dev->name);
2481 break;
2482 }
2483
2484 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2485 idev = ipv6_add_dev(dev);
2486
2487 if (idev) {
2488 idev->if_flags |= IF_READY;
2489 run_pending = 1;
2490 }
2491 } else {
2492 if (!addrconf_qdisc_ok(dev)) {
2493 /* device is still not ready. */
2494 break;
2495 }
2496
2497 if (idev) {
2498 if (idev->if_flags & IF_READY) {
2499 /* device is already configured. */
2500 break;
2501 }
2502 idev->if_flags |= IF_READY;
2503 }
2504
2505 printk(KERN_INFO
2506 "ADDRCONF(NETDEV_CHANGE): %s: "
2507 "link becomes ready\n",
2508 dev->name);
2509
2510 run_pending = 1;
2511 }
2512
2513 switch(dev->type) {
2514 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2515 case ARPHRD_SIT:
2516 addrconf_sit_config(dev);
2517 break;
2518 #endif
2519 case ARPHRD_TUNNEL6:
2520 addrconf_ip6_tnl_config(dev);
2521 break;
2522 case ARPHRD_LOOPBACK:
2523 init_loopback(dev);
2524 break;
2525
2526 default:
2527 addrconf_dev_config(dev);
2528 break;
2529 }
2530 if (idev) {
2531 if (run_pending)
2532 addrconf_dad_run(idev);
2533
2534 /* If the MTU changed during the interface down, when the
2535 interface up, the changed MTU must be reflected in the
2536 idev as well as routers.
2537 */
2538 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2539 rt6_mtu_change(dev, dev->mtu);
2540 idev->cnf.mtu6 = dev->mtu;
2541 }
2542 idev->tstamp = jiffies;
2543 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2544 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2545 stop IPv6 on this interface.
2546 */
2547 if (dev->mtu < IPV6_MIN_MTU)
2548 addrconf_ifdown(dev, event != NETDEV_DOWN);
2549 }
2550 break;
2551
2552 case NETDEV_CHANGEMTU:
2553 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2554 rt6_mtu_change(dev, dev->mtu);
2555 idev->cnf.mtu6 = dev->mtu;
2556 break;
2557 }
2558
2559 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2560 idev = ipv6_add_dev(dev);
2561 if (idev)
2562 break;
2563 }
2564
2565 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2566
2567 case NETDEV_DOWN:
2568 case NETDEV_UNREGISTER:
2569 /*
2570 * Remove all addresses from this interface.
2571 */
2572 addrconf_ifdown(dev, event != NETDEV_DOWN);
2573 break;
2574
2575 case NETDEV_CHANGENAME:
2576 if (idev) {
2577 snmp6_unregister_dev(idev);
2578 addrconf_sysctl_unregister(idev);
2579 addrconf_sysctl_register(idev);
2580 err = snmp6_register_dev(idev);
2581 if (err)
2582 return notifier_from_errno(err);
2583 }
2584 break;
2585 }
2586
2587 return NOTIFY_OK;
2588 }
2589
2590 /*
2591 * addrconf module should be notified of a device going up
2592 */
2593 static struct notifier_block ipv6_dev_notf = {
2594 .notifier_call = addrconf_notify,
2595 .priority = 0
2596 };
2597
2598 static int addrconf_ifdown(struct net_device *dev, int how)
2599 {
2600 struct inet6_dev *idev;
2601 struct inet6_ifaddr *ifa, **bifa;
2602 struct net *net = dev_net(dev);
2603 int i;
2604
2605 ASSERT_RTNL();
2606
2607 rt6_ifdown(net, dev);
2608 neigh_ifdown(&nd_tbl, dev);
2609
2610 idev = __in6_dev_get(dev);
2611 if (idev == NULL)
2612 return -ENODEV;
2613
2614 /* Step 1: remove reference to ipv6 device from parent device.
2615 Do not dev_put!
2616 */
2617 if (how) {
2618 idev->dead = 1;
2619
2620 /* protected by rtnl_lock */
2621 rcu_assign_pointer(dev->ip6_ptr, NULL);
2622
2623 /* Step 1.5: remove snmp6 entry */
2624 snmp6_unregister_dev(idev);
2625
2626 }
2627
2628 /* Step 2: clear hash table */
2629 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2630 bifa = &inet6_addr_lst[i];
2631
2632 write_lock_bh(&addrconf_hash_lock);
2633 while ((ifa = *bifa) != NULL) {
2634 if (ifa->idev == idev) {
2635 *bifa = ifa->lst_next;
2636 ifa->lst_next = NULL;
2637 addrconf_del_timer(ifa);
2638 in6_ifa_put(ifa);
2639 continue;
2640 }
2641 bifa = &ifa->lst_next;
2642 }
2643 write_unlock_bh(&addrconf_hash_lock);
2644 }
2645
2646 write_lock_bh(&idev->lock);
2647
2648 /* Step 3: clear flags for stateless addrconf */
2649 if (!how)
2650 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2651
2652 /* Step 4: clear address list */
2653 #ifdef CONFIG_IPV6_PRIVACY
2654 if (how && del_timer(&idev->regen_timer))
2655 in6_dev_put(idev);
2656
2657 /* clear tempaddr list */
2658 while ((ifa = idev->tempaddr_list) != NULL) {
2659 idev->tempaddr_list = ifa->tmp_next;
2660 ifa->tmp_next = NULL;
2661 ifa->dead = 1;
2662 write_unlock_bh(&idev->lock);
2663 spin_lock_bh(&ifa->lock);
2664
2665 if (ifa->ifpub) {
2666 in6_ifa_put(ifa->ifpub);
2667 ifa->ifpub = NULL;
2668 }
2669 spin_unlock_bh(&ifa->lock);
2670 in6_ifa_put(ifa);
2671 write_lock_bh(&idev->lock);
2672 }
2673 #endif
2674 while ((ifa = idev->addr_list) != NULL) {
2675 idev->addr_list = ifa->if_next;
2676 ifa->if_next = NULL;
2677 ifa->dead = 1;
2678 addrconf_del_timer(ifa);
2679 write_unlock_bh(&idev->lock);
2680
2681 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2682 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2683 in6_ifa_put(ifa);
2684
2685 write_lock_bh(&idev->lock);
2686 }
2687 write_unlock_bh(&idev->lock);
2688
2689 /* Step 5: Discard multicast list */
2690
2691 if (how)
2692 ipv6_mc_destroy_dev(idev);
2693 else
2694 ipv6_mc_down(idev);
2695
2696 idev->tstamp = jiffies;
2697
2698 /* Shot the device (if unregistered) */
2699
2700 if (how) {
2701 addrconf_sysctl_unregister(idev);
2702 neigh_parms_release(&nd_tbl, idev->nd_parms);
2703 neigh_ifdown(&nd_tbl, dev);
2704 in6_dev_put(idev);
2705 }
2706 return 0;
2707 }
2708
2709 static void addrconf_rs_timer(unsigned long data)
2710 {
2711 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2712
2713 if (ifp->idev->cnf.forwarding)
2714 goto out;
2715
2716 if (ifp->idev->if_flags & IF_RA_RCVD) {
2717 /*
2718 * Announcement received after solicitation
2719 * was sent
2720 */
2721 goto out;
2722 }
2723
2724 spin_lock(&ifp->lock);
2725 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2726 /* The wait after the last probe can be shorter */
2727 addrconf_mod_timer(ifp, AC_RS,
2728 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2729 ifp->idev->cnf.rtr_solicit_delay :
2730 ifp->idev->cnf.rtr_solicit_interval);
2731 spin_unlock(&ifp->lock);
2732
2733 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2734 } else {
2735 spin_unlock(&ifp->lock);
2736 /*
2737 * Note: we do not support deprecated "all on-link"
2738 * assumption any longer.
2739 */
2740 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2741 ifp->idev->dev->name);
2742 }
2743
2744 out:
2745 in6_ifa_put(ifp);
2746 }
2747
2748 /*
2749 * Duplicate Address Detection
2750 */
2751 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2752 {
2753 unsigned long rand_num;
2754 struct inet6_dev *idev = ifp->idev;
2755
2756 if (ifp->flags & IFA_F_OPTIMISTIC)
2757 rand_num = 0;
2758 else
2759 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2760
2761 ifp->probes = idev->cnf.dad_transmits;
2762 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2763 }
2764
2765 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2766 {
2767 struct inet6_dev *idev = ifp->idev;
2768 struct net_device *dev = idev->dev;
2769
2770 addrconf_join_solict(dev, &ifp->addr);
2771
2772 net_srandom(ifp->addr.s6_addr32[3]);
2773
2774 read_lock_bh(&idev->lock);
2775 if (ifp->dead)
2776 goto out;
2777 spin_lock_bh(&ifp->lock);
2778
2779 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2780 idev->cnf.accept_dad < 1 ||
2781 !(ifp->flags&IFA_F_TENTATIVE) ||
2782 ifp->flags & IFA_F_NODAD) {
2783 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2784 spin_unlock_bh(&ifp->lock);
2785 read_unlock_bh(&idev->lock);
2786
2787 addrconf_dad_completed(ifp);
2788 return;
2789 }
2790
2791 if (!(idev->if_flags & IF_READY)) {
2792 spin_unlock_bh(&ifp->lock);
2793 read_unlock_bh(&idev->lock);
2794 /*
2795 * If the device is not ready:
2796 * - keep it tentative if it is a permanent address.
2797 * - otherwise, kill it.
2798 */
2799 in6_ifa_hold(ifp);
2800 addrconf_dad_stop(ifp, 0);
2801 return;
2802 }
2803
2804 /*
2805 * Optimistic nodes can start receiving
2806 * Frames right away
2807 */
2808 if(ifp->flags & IFA_F_OPTIMISTIC)
2809 ip6_ins_rt(ifp->rt);
2810
2811 addrconf_dad_kick(ifp);
2812 spin_unlock_bh(&ifp->lock);
2813 out:
2814 read_unlock_bh(&idev->lock);
2815 }
2816
2817 static void addrconf_dad_timer(unsigned long data)
2818 {
2819 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2820 struct inet6_dev *idev = ifp->idev;
2821 struct in6_addr mcaddr;
2822
2823 read_lock_bh(&idev->lock);
2824 if (idev->dead) {
2825 read_unlock_bh(&idev->lock);
2826 goto out;
2827 }
2828 spin_lock_bh(&ifp->lock);
2829 if (ifp->probes == 0) {
2830 /*
2831 * DAD was successful
2832 */
2833
2834 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2835 spin_unlock_bh(&ifp->lock);
2836 read_unlock_bh(&idev->lock);
2837
2838 addrconf_dad_completed(ifp);
2839
2840 goto out;
2841 }
2842
2843 ifp->probes--;
2844 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2845 spin_unlock_bh(&ifp->lock);
2846 read_unlock_bh(&idev->lock);
2847
2848 /* send a neighbour solicitation for our addr */
2849 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2850 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2851 out:
2852 in6_ifa_put(ifp);
2853 }
2854
2855 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2856 {
2857 struct net_device * dev = ifp->idev->dev;
2858
2859 /*
2860 * Configure the address for reception. Now it is valid.
2861 */
2862
2863 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2864
2865 /* If added prefix is link local and forwarding is off,
2866 start sending router solicitations.
2867 */
2868
2869 if (ifp->idev->cnf.forwarding == 0 &&
2870 ifp->idev->cnf.rtr_solicits > 0 &&
2871 (dev->flags&IFF_LOOPBACK) == 0 &&
2872 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2873 /*
2874 * If a host as already performed a random delay
2875 * [...] as part of DAD [...] there is no need
2876 * to delay again before sending the first RS
2877 */
2878 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2879
2880 spin_lock_bh(&ifp->lock);
2881 ifp->probes = 1;
2882 ifp->idev->if_flags |= IF_RS_SENT;
2883 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2884 spin_unlock_bh(&ifp->lock);
2885 }
2886 }
2887
2888 static void addrconf_dad_run(struct inet6_dev *idev) {
2889 struct inet6_ifaddr *ifp;
2890
2891 read_lock_bh(&idev->lock);
2892 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2893 spin_lock_bh(&ifp->lock);
2894 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2895 spin_unlock_bh(&ifp->lock);
2896 continue;
2897 }
2898 spin_unlock_bh(&ifp->lock);
2899 addrconf_dad_kick(ifp);
2900 }
2901 read_unlock_bh(&idev->lock);
2902 }
2903
2904 #ifdef CONFIG_PROC_FS
2905 struct if6_iter_state {
2906 struct seq_net_private p;
2907 int bucket;
2908 };
2909
2910 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2911 {
2912 struct inet6_ifaddr *ifa = NULL;
2913 struct if6_iter_state *state = seq->private;
2914 struct net *net = seq_file_net(seq);
2915
2916 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2917 ifa = inet6_addr_lst[state->bucket];
2918
2919 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2920 ifa = ifa->lst_next;
2921 if (ifa)
2922 break;
2923 }
2924 return ifa;
2925 }
2926
2927 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2928 {
2929 struct if6_iter_state *state = seq->private;
2930 struct net *net = seq_file_net(seq);
2931
2932 ifa = ifa->lst_next;
2933 try_again:
2934 if (ifa) {
2935 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2936 ifa = ifa->lst_next;
2937 goto try_again;
2938 }
2939 }
2940
2941 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2942 ifa = inet6_addr_lst[state->bucket];
2943 goto try_again;
2944 }
2945
2946 return ifa;
2947 }
2948
2949 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2950 {
2951 struct inet6_ifaddr *ifa = if6_get_first(seq);
2952
2953 if (ifa)
2954 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2955 --pos;
2956 return pos ? NULL : ifa;
2957 }
2958
2959 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2960 __acquires(addrconf_hash_lock)
2961 {
2962 read_lock_bh(&addrconf_hash_lock);
2963 return if6_get_idx(seq, *pos);
2964 }
2965
2966 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2967 {
2968 struct inet6_ifaddr *ifa;
2969
2970 ifa = if6_get_next(seq, v);
2971 ++*pos;
2972 return ifa;
2973 }
2974
2975 static void if6_seq_stop(struct seq_file *seq, void *v)
2976 __releases(addrconf_hash_lock)
2977 {
2978 read_unlock_bh(&addrconf_hash_lock);
2979 }
2980
2981 static int if6_seq_show(struct seq_file *seq, void *v)
2982 {
2983 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2984 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
2985 &ifp->addr,
2986 ifp->idev->dev->ifindex,
2987 ifp->prefix_len,
2988 ifp->scope,
2989 ifp->flags,
2990 ifp->idev->dev->name);
2991 return 0;
2992 }
2993
2994 static const struct seq_operations if6_seq_ops = {
2995 .start = if6_seq_start,
2996 .next = if6_seq_next,
2997 .show = if6_seq_show,
2998 .stop = if6_seq_stop,
2999 };
3000
3001 static int if6_seq_open(struct inode *inode, struct file *file)
3002 {
3003 return seq_open_net(inode, file, &if6_seq_ops,
3004 sizeof(struct if6_iter_state));
3005 }
3006
3007 static const struct file_operations if6_fops = {
3008 .owner = THIS_MODULE,
3009 .open = if6_seq_open,
3010 .read = seq_read,
3011 .llseek = seq_lseek,
3012 .release = seq_release_net,
3013 };
3014
3015 static int if6_proc_net_init(struct net *net)
3016 {
3017 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3018 return -ENOMEM;
3019 return 0;
3020 }
3021
3022 static void if6_proc_net_exit(struct net *net)
3023 {
3024 proc_net_remove(net, "if_inet6");
3025 }
3026
3027 static struct pernet_operations if6_proc_net_ops = {
3028 .init = if6_proc_net_init,
3029 .exit = if6_proc_net_exit,
3030 };
3031
3032 int __init if6_proc_init(void)
3033 {
3034 return register_pernet_subsys(&if6_proc_net_ops);
3035 }
3036
3037 void if6_proc_exit(void)
3038 {
3039 unregister_pernet_subsys(&if6_proc_net_ops);
3040 }
3041 #endif /* CONFIG_PROC_FS */
3042
3043 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3044 /* Check if address is a home address configured on any interface. */
3045 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3046 {
3047 int ret = 0;
3048 struct inet6_ifaddr * ifp;
3049 u8 hash = ipv6_addr_hash(addr);
3050 read_lock_bh(&addrconf_hash_lock);
3051 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3052 if (!net_eq(dev_net(ifp->idev->dev), net))
3053 continue;
3054 if (ipv6_addr_equal(&ifp->addr, addr) &&
3055 (ifp->flags & IFA_F_HOMEADDRESS)) {
3056 ret = 1;
3057 break;
3058 }
3059 }
3060 read_unlock_bh(&addrconf_hash_lock);
3061 return ret;
3062 }
3063 #endif
3064
3065 /*
3066 * Periodic address status verification
3067 */
3068
3069 static void addrconf_verify(unsigned long foo)
3070 {
3071 struct inet6_ifaddr *ifp;
3072 unsigned long now, next;
3073 int i;
3074
3075 spin_lock_bh(&addrconf_verify_lock);
3076 now = jiffies;
3077 next = now + ADDR_CHECK_FREQUENCY;
3078
3079 del_timer(&addr_chk_timer);
3080
3081 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3082
3083 restart:
3084 read_lock(&addrconf_hash_lock);
3085 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3086 unsigned long age;
3087 #ifdef CONFIG_IPV6_PRIVACY
3088 unsigned long regen_advance;
3089 #endif
3090
3091 if (ifp->flags & IFA_F_PERMANENT)
3092 continue;
3093
3094 spin_lock(&ifp->lock);
3095 age = (now - ifp->tstamp) / HZ;
3096
3097 #ifdef CONFIG_IPV6_PRIVACY
3098 regen_advance = ifp->idev->cnf.regen_max_retry *
3099 ifp->idev->cnf.dad_transmits *
3100 ifp->idev->nd_parms->retrans_time / HZ;
3101 #endif
3102
3103 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3104 age >= ifp->valid_lft) {
3105 spin_unlock(&ifp->lock);
3106 in6_ifa_hold(ifp);
3107 read_unlock(&addrconf_hash_lock);
3108 ipv6_del_addr(ifp);
3109 goto restart;
3110 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3111 spin_unlock(&ifp->lock);
3112 continue;
3113 } else if (age >= ifp->prefered_lft) {
3114 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3115 int deprecate = 0;
3116
3117 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3118 deprecate = 1;
3119 ifp->flags |= IFA_F_DEPRECATED;
3120 }
3121
3122 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3123 next = ifp->tstamp + ifp->valid_lft * HZ;
3124
3125 spin_unlock(&ifp->lock);
3126
3127 if (deprecate) {
3128 in6_ifa_hold(ifp);
3129 read_unlock(&addrconf_hash_lock);
3130
3131 ipv6_ifa_notify(0, ifp);
3132 in6_ifa_put(ifp);
3133 goto restart;
3134 }
3135 #ifdef CONFIG_IPV6_PRIVACY
3136 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3137 !(ifp->flags&IFA_F_TENTATIVE)) {
3138 if (age >= ifp->prefered_lft - regen_advance) {
3139 struct inet6_ifaddr *ifpub = ifp->ifpub;
3140 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3141 next = ifp->tstamp + ifp->prefered_lft * HZ;
3142 if (!ifp->regen_count && ifpub) {
3143 ifp->regen_count++;
3144 in6_ifa_hold(ifp);
3145 in6_ifa_hold(ifpub);
3146 spin_unlock(&ifp->lock);
3147 read_unlock(&addrconf_hash_lock);
3148 spin_lock(&ifpub->lock);
3149 ifpub->regen_count = 0;
3150 spin_unlock(&ifpub->lock);
3151 ipv6_create_tempaddr(ifpub, ifp);
3152 in6_ifa_put(ifpub);
3153 in6_ifa_put(ifp);
3154 goto restart;
3155 }
3156 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3157 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3158 spin_unlock(&ifp->lock);
3159 #endif
3160 } else {
3161 /* ifp->prefered_lft <= ifp->valid_lft */
3162 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3163 next = ifp->tstamp + ifp->prefered_lft * HZ;
3164 spin_unlock(&ifp->lock);
3165 }
3166 }
3167 read_unlock(&addrconf_hash_lock);
3168 }
3169
3170 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3171 add_timer(&addr_chk_timer);
3172 spin_unlock_bh(&addrconf_verify_lock);
3173 }
3174
3175 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3176 {
3177 struct in6_addr *pfx = NULL;
3178
3179 if (addr)
3180 pfx = nla_data(addr);
3181
3182 if (local) {
3183 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3184 pfx = NULL;
3185 else
3186 pfx = nla_data(local);
3187 }
3188
3189 return pfx;
3190 }
3191
3192 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3193 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3194 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3195 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3196 };
3197
3198 static int
3199 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3200 {
3201 struct net *net = sock_net(skb->sk);
3202 struct ifaddrmsg *ifm;
3203 struct nlattr *tb[IFA_MAX+1];
3204 struct in6_addr *pfx;
3205 int err;
3206
3207 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3208 if (err < 0)
3209 return err;
3210
3211 ifm = nlmsg_data(nlh);
3212 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3213 if (pfx == NULL)
3214 return -EINVAL;
3215
3216 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3217 }
3218
3219 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3220 u32 prefered_lft, u32 valid_lft)
3221 {
3222 u32 flags;
3223 clock_t expires;
3224 unsigned long timeout;
3225
3226 if (!valid_lft || (prefered_lft > valid_lft))
3227 return -EINVAL;
3228
3229 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3230 if (addrconf_finite_timeout(timeout)) {
3231 expires = jiffies_to_clock_t(timeout * HZ);
3232 valid_lft = timeout;
3233 flags = RTF_EXPIRES;
3234 } else {
3235 expires = 0;
3236 flags = 0;
3237 ifa_flags |= IFA_F_PERMANENT;
3238 }
3239
3240 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3241 if (addrconf_finite_timeout(timeout)) {
3242 if (timeout == 0)
3243 ifa_flags |= IFA_F_DEPRECATED;
3244 prefered_lft = timeout;
3245 }
3246
3247 spin_lock_bh(&ifp->lock);
3248 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3249 ifp->tstamp = jiffies;
3250 ifp->valid_lft = valid_lft;
3251 ifp->prefered_lft = prefered_lft;
3252
3253 spin_unlock_bh(&ifp->lock);
3254 if (!(ifp->flags&IFA_F_TENTATIVE))
3255 ipv6_ifa_notify(0, ifp);
3256
3257 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3258 expires, flags);
3259 addrconf_verify(0);
3260
3261 return 0;
3262 }
3263
3264 static int
3265 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3266 {
3267 struct net *net = sock_net(skb->sk);
3268 struct ifaddrmsg *ifm;
3269 struct nlattr *tb[IFA_MAX+1];
3270 struct in6_addr *pfx;
3271 struct inet6_ifaddr *ifa;
3272 struct net_device *dev;
3273 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3274 u8 ifa_flags;
3275 int err;
3276
3277 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3278 if (err < 0)
3279 return err;
3280
3281 ifm = nlmsg_data(nlh);
3282 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3283 if (pfx == NULL)
3284 return -EINVAL;
3285
3286 if (tb[IFA_CACHEINFO]) {
3287 struct ifa_cacheinfo *ci;
3288
3289 ci = nla_data(tb[IFA_CACHEINFO]);
3290 valid_lft = ci->ifa_valid;
3291 preferred_lft = ci->ifa_prefered;
3292 } else {
3293 preferred_lft = INFINITY_LIFE_TIME;
3294 valid_lft = INFINITY_LIFE_TIME;
3295 }
3296
3297 dev = __dev_get_by_index(net, ifm->ifa_index);
3298 if (dev == NULL)
3299 return -ENODEV;
3300
3301 /* We ignore other flags so far. */
3302 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3303
3304 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3305 if (ifa == NULL) {
3306 /*
3307 * It would be best to check for !NLM_F_CREATE here but
3308 * userspace alreay relies on not having to provide this.
3309 */
3310 return inet6_addr_add(net, ifm->ifa_index, pfx,
3311 ifm->ifa_prefixlen, ifa_flags,
3312 preferred_lft, valid_lft);
3313 }
3314
3315 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3316 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3317 err = -EEXIST;
3318 else
3319 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3320
3321 in6_ifa_put(ifa);
3322
3323 return err;
3324 }
3325
3326 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3327 u8 scope, int ifindex)
3328 {
3329 struct ifaddrmsg *ifm;
3330
3331 ifm = nlmsg_data(nlh);
3332 ifm->ifa_family = AF_INET6;
3333 ifm->ifa_prefixlen = prefixlen;
3334 ifm->ifa_flags = flags;
3335 ifm->ifa_scope = scope;
3336 ifm->ifa_index = ifindex;
3337 }
3338
3339 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3340 unsigned long tstamp, u32 preferred, u32 valid)
3341 {
3342 struct ifa_cacheinfo ci;
3343
3344 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3345 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3346 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3347 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3348 ci.ifa_prefered = preferred;
3349 ci.ifa_valid = valid;
3350
3351 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3352 }
3353
3354 static inline int rt_scope(int ifa_scope)
3355 {
3356 if (ifa_scope & IFA_HOST)
3357 return RT_SCOPE_HOST;
3358 else if (ifa_scope & IFA_LINK)
3359 return RT_SCOPE_LINK;
3360 else if (ifa_scope & IFA_SITE)
3361 return RT_SCOPE_SITE;
3362 else
3363 return RT_SCOPE_UNIVERSE;
3364 }
3365
3366 static inline int inet6_ifaddr_msgsize(void)
3367 {
3368 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3369 + nla_total_size(16) /* IFA_ADDRESS */
3370 + nla_total_size(sizeof(struct ifa_cacheinfo));
3371 }
3372
3373 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3374 u32 pid, u32 seq, int event, unsigned int flags)
3375 {
3376 struct nlmsghdr *nlh;
3377 u32 preferred, valid;
3378
3379 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3380 if (nlh == NULL)
3381 return -EMSGSIZE;
3382
3383 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3384 ifa->idev->dev->ifindex);
3385
3386 if (!(ifa->flags&IFA_F_PERMANENT)) {
3387 preferred = ifa->prefered_lft;
3388 valid = ifa->valid_lft;
3389 if (preferred != INFINITY_LIFE_TIME) {
3390 long tval = (jiffies - ifa->tstamp)/HZ;
3391 if (preferred > tval)
3392 preferred -= tval;
3393 else
3394 preferred = 0;
3395 if (valid != INFINITY_LIFE_TIME)
3396 valid -= tval;
3397 }
3398 } else {
3399 preferred = INFINITY_LIFE_TIME;
3400 valid = INFINITY_LIFE_TIME;
3401 }
3402
3403 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3404 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3405 nlmsg_cancel(skb, nlh);
3406 return -EMSGSIZE;
3407 }
3408
3409 return nlmsg_end(skb, nlh);
3410 }
3411
3412 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3413 u32 pid, u32 seq, int event, u16 flags)
3414 {
3415 struct nlmsghdr *nlh;
3416 u8 scope = RT_SCOPE_UNIVERSE;
3417 int ifindex = ifmca->idev->dev->ifindex;
3418
3419 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3420 scope = RT_SCOPE_SITE;
3421
3422 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3423 if (nlh == NULL)
3424 return -EMSGSIZE;
3425
3426 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3427 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3428 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3429 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3430 nlmsg_cancel(skb, nlh);
3431 return -EMSGSIZE;
3432 }
3433
3434 return nlmsg_end(skb, nlh);
3435 }
3436
3437 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3438 u32 pid, u32 seq, int event, unsigned int flags)
3439 {
3440 struct nlmsghdr *nlh;
3441 u8 scope = RT_SCOPE_UNIVERSE;
3442 int ifindex = ifaca->aca_idev->dev->ifindex;
3443
3444 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3445 scope = RT_SCOPE_SITE;
3446
3447 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3448 if (nlh == NULL)
3449 return -EMSGSIZE;
3450
3451 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3452 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3453 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3454 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3455 nlmsg_cancel(skb, nlh);
3456 return -EMSGSIZE;
3457 }
3458
3459 return nlmsg_end(skb, nlh);
3460 }
3461
3462 enum addr_type_t
3463 {
3464 UNICAST_ADDR,
3465 MULTICAST_ADDR,
3466 ANYCAST_ADDR,
3467 };
3468
3469 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3470 enum addr_type_t type)
3471 {
3472 int idx, ip_idx;
3473 int s_idx, s_ip_idx;
3474 int err = 1;
3475 struct net_device *dev;
3476 struct inet6_dev *idev = NULL;
3477 struct inet6_ifaddr *ifa;
3478 struct ifmcaddr6 *ifmca;
3479 struct ifacaddr6 *ifaca;
3480 struct net *net = sock_net(skb->sk);
3481
3482 s_idx = cb->args[0];
3483 s_ip_idx = ip_idx = cb->args[1];
3484
3485 idx = 0;
3486 for_each_netdev(net, dev) {
3487 if (idx < s_idx)
3488 goto cont;
3489 if (idx > s_idx)
3490 s_ip_idx = 0;
3491 ip_idx = 0;
3492 if ((idev = in6_dev_get(dev)) == NULL)
3493 goto cont;
3494 read_lock_bh(&idev->lock);
3495 switch (type) {
3496 case UNICAST_ADDR:
3497 /* unicast address incl. temp addr */
3498 for (ifa = idev->addr_list; ifa;
3499 ifa = ifa->if_next, ip_idx++) {
3500 if (ip_idx < s_ip_idx)
3501 continue;
3502 err = inet6_fill_ifaddr(skb, ifa,
3503 NETLINK_CB(cb->skb).pid,
3504 cb->nlh->nlmsg_seq,
3505 RTM_NEWADDR,
3506 NLM_F_MULTI);
3507 }
3508 break;
3509 case MULTICAST_ADDR:
3510 /* multicast address */
3511 for (ifmca = idev->mc_list; ifmca;
3512 ifmca = ifmca->next, ip_idx++) {
3513 if (ip_idx < s_ip_idx)
3514 continue;
3515 err = inet6_fill_ifmcaddr(skb, ifmca,
3516 NETLINK_CB(cb->skb).pid,
3517 cb->nlh->nlmsg_seq,
3518 RTM_GETMULTICAST,
3519 NLM_F_MULTI);
3520 }
3521 break;
3522 case ANYCAST_ADDR:
3523 /* anycast address */
3524 for (ifaca = idev->ac_list; ifaca;
3525 ifaca = ifaca->aca_next, ip_idx++) {
3526 if (ip_idx < s_ip_idx)
3527 continue;
3528 err = inet6_fill_ifacaddr(skb, ifaca,
3529 NETLINK_CB(cb->skb).pid,
3530 cb->nlh->nlmsg_seq,
3531 RTM_GETANYCAST,
3532 NLM_F_MULTI);
3533 }
3534 break;
3535 default:
3536 break;
3537 }
3538 read_unlock_bh(&idev->lock);
3539 in6_dev_put(idev);
3540
3541 if (err <= 0)
3542 break;
3543 cont:
3544 idx++;
3545 }
3546 cb->args[0] = idx;
3547 cb->args[1] = ip_idx;
3548 return skb->len;
3549 }
3550
3551 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3552 {
3553 enum addr_type_t type = UNICAST_ADDR;
3554
3555 return inet6_dump_addr(skb, cb, type);
3556 }
3557
3558 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3559 {
3560 enum addr_type_t type = MULTICAST_ADDR;
3561
3562 return inet6_dump_addr(skb, cb, type);
3563 }
3564
3565
3566 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3567 {
3568 enum addr_type_t type = ANYCAST_ADDR;
3569
3570 return inet6_dump_addr(skb, cb, type);
3571 }
3572
3573 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3574 void *arg)
3575 {
3576 struct net *net = sock_net(in_skb->sk);
3577 struct ifaddrmsg *ifm;
3578 struct nlattr *tb[IFA_MAX+1];
3579 struct in6_addr *addr = NULL;
3580 struct net_device *dev = NULL;
3581 struct inet6_ifaddr *ifa;
3582 struct sk_buff *skb;
3583 int err;
3584
3585 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3586 if (err < 0)
3587 goto errout;
3588
3589 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3590 if (addr == NULL) {
3591 err = -EINVAL;
3592 goto errout;
3593 }
3594
3595 ifm = nlmsg_data(nlh);
3596 if (ifm->ifa_index)
3597 dev = __dev_get_by_index(net, ifm->ifa_index);
3598
3599 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3600 err = -EADDRNOTAVAIL;
3601 goto errout;
3602 }
3603
3604 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3605 err = -ENOBUFS;
3606 goto errout_ifa;
3607 }
3608
3609 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3610 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3611 if (err < 0) {
3612 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3613 WARN_ON(err == -EMSGSIZE);
3614 kfree_skb(skb);
3615 goto errout_ifa;
3616 }
3617 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3618 errout_ifa:
3619 in6_ifa_put(ifa);
3620 errout:
3621 return err;
3622 }
3623
3624 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3625 {
3626 struct sk_buff *skb;
3627 struct net *net = dev_net(ifa->idev->dev);
3628 int err = -ENOBUFS;
3629
3630 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3631 if (skb == NULL)
3632 goto errout;
3633
3634 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3635 if (err < 0) {
3636 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3637 WARN_ON(err == -EMSGSIZE);
3638 kfree_skb(skb);
3639 goto errout;
3640 }
3641 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3642 return;
3643 errout:
3644 if (err < 0)
3645 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3646 }
3647
3648 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3649 __s32 *array, int bytes)
3650 {
3651 BUG_ON(bytes < (DEVCONF_MAX * 4));
3652
3653 memset(array, 0, bytes);
3654 array[DEVCONF_FORWARDING] = cnf->forwarding;
3655 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3656 array[DEVCONF_MTU6] = cnf->mtu6;
3657 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3658 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3659 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3660 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3661 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3662 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3663 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3664 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3665 #ifdef CONFIG_IPV6_PRIVACY
3666 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3667 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3668 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3669 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3670 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3671 #endif
3672 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3673 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3674 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3675 #ifdef CONFIG_IPV6_ROUTER_PREF
3676 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3677 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3678 #ifdef CONFIG_IPV6_ROUTE_INFO
3679 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3680 #endif
3681 #endif
3682 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3683 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3684 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3685 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3686 #endif
3687 #ifdef CONFIG_IPV6_MROUTE
3688 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3689 #endif
3690 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3691 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3692 }
3693
3694 static inline size_t inet6_if_nlmsg_size(void)
3695 {
3696 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3697 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3698 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3699 + nla_total_size(4) /* IFLA_MTU */
3700 + nla_total_size(4) /* IFLA_LINK */
3701 + nla_total_size( /* IFLA_PROTINFO */
3702 nla_total_size(4) /* IFLA_INET6_FLAGS */
3703 + nla_total_size(sizeof(struct ifla_cacheinfo))
3704 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3705 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3706 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3707 );
3708 }
3709
3710 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3711 int bytes)
3712 {
3713 int i;
3714 int pad = bytes - sizeof(u64) * items;
3715 BUG_ON(pad < 0);
3716
3717 /* Use put_unaligned() because stats may not be aligned for u64. */
3718 put_unaligned(items, &stats[0]);
3719 for (i = 1; i < items; i++)
3720 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3721
3722 memset(&stats[items], 0, pad);
3723 }
3724
3725 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3726 int bytes)
3727 {
3728 switch(attrtype) {
3729 case IFLA_INET6_STATS:
3730 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3731 break;
3732 case IFLA_INET6_ICMP6STATS:
3733 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3734 break;
3735 }
3736 }
3737
3738 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3739 u32 pid, u32 seq, int event, unsigned int flags)
3740 {
3741 struct net_device *dev = idev->dev;
3742 struct nlattr *nla;
3743 struct ifinfomsg *hdr;
3744 struct nlmsghdr *nlh;
3745 void *protoinfo;
3746 struct ifla_cacheinfo ci;
3747
3748 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3749 if (nlh == NULL)
3750 return -EMSGSIZE;
3751
3752 hdr = nlmsg_data(nlh);
3753 hdr->ifi_family = AF_INET6;
3754 hdr->__ifi_pad = 0;
3755 hdr->ifi_type = dev->type;
3756 hdr->ifi_index = dev->ifindex;
3757 hdr->ifi_flags = dev_get_flags(dev);
3758 hdr->ifi_change = 0;
3759
3760 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3761
3762 if (dev->addr_len)
3763 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3764
3765 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3766 if (dev->ifindex != dev->iflink)
3767 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3768
3769 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3770 if (protoinfo == NULL)
3771 goto nla_put_failure;
3772
3773 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3774
3775 ci.max_reasm_len = IPV6_MAXPLEN;
3776 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3777 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3778 ci.reachable_time = idev->nd_parms->reachable_time;
3779 ci.retrans_time = idev->nd_parms->retrans_time;
3780 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3781
3782 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3783 if (nla == NULL)
3784 goto nla_put_failure;
3785 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3786
3787 /* XXX - MC not implemented */
3788
3789 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3790 if (nla == NULL)
3791 goto nla_put_failure;
3792 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3793
3794 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3795 if (nla == NULL)
3796 goto nla_put_failure;
3797 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3798
3799 nla_nest_end(skb, protoinfo);
3800 return nlmsg_end(skb, nlh);
3801
3802 nla_put_failure:
3803 nlmsg_cancel(skb, nlh);
3804 return -EMSGSIZE;
3805 }
3806
3807 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3808 {
3809 struct net *net = sock_net(skb->sk);
3810 int idx, err;
3811 int s_idx = cb->args[0];
3812 struct net_device *dev;
3813 struct inet6_dev *idev;
3814
3815 read_lock(&dev_base_lock);
3816 idx = 0;
3817 for_each_netdev(net, dev) {
3818 if (idx < s_idx)
3819 goto cont;
3820 if ((idev = in6_dev_get(dev)) == NULL)
3821 goto cont;
3822 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3823 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3824 in6_dev_put(idev);
3825 if (err <= 0)
3826 break;
3827 cont:
3828 idx++;
3829 }
3830 read_unlock(&dev_base_lock);
3831 cb->args[0] = idx;
3832
3833 return skb->len;
3834 }
3835
3836 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3837 {
3838 struct sk_buff *skb;
3839 struct net *net = dev_net(idev->dev);
3840 int err = -ENOBUFS;
3841
3842 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3843 if (skb == NULL)
3844 goto errout;
3845
3846 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3847 if (err < 0) {
3848 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3849 WARN_ON(err == -EMSGSIZE);
3850 kfree_skb(skb);
3851 goto errout;
3852 }
3853 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3854 return;
3855 errout:
3856 if (err < 0)
3857 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3858 }
3859
3860 static inline size_t inet6_prefix_nlmsg_size(void)
3861 {
3862 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3863 + nla_total_size(sizeof(struct in6_addr))
3864 + nla_total_size(sizeof(struct prefix_cacheinfo));
3865 }
3866
3867 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3868 struct prefix_info *pinfo, u32 pid, u32 seq,
3869 int event, unsigned int flags)
3870 {
3871 struct prefixmsg *pmsg;
3872 struct nlmsghdr *nlh;
3873 struct prefix_cacheinfo ci;
3874
3875 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3876 if (nlh == NULL)
3877 return -EMSGSIZE;
3878
3879 pmsg = nlmsg_data(nlh);
3880 pmsg->prefix_family = AF_INET6;
3881 pmsg->prefix_pad1 = 0;
3882 pmsg->prefix_pad2 = 0;
3883 pmsg->prefix_ifindex = idev->dev->ifindex;
3884 pmsg->prefix_len = pinfo->prefix_len;
3885 pmsg->prefix_type = pinfo->type;
3886 pmsg->prefix_pad3 = 0;
3887 pmsg->prefix_flags = 0;
3888 if (pinfo->onlink)
3889 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3890 if (pinfo->autoconf)
3891 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3892
3893 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3894
3895 ci.preferred_time = ntohl(pinfo->prefered);
3896 ci.valid_time = ntohl(pinfo->valid);
3897 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3898
3899 return nlmsg_end(skb, nlh);
3900
3901 nla_put_failure:
3902 nlmsg_cancel(skb, nlh);
3903 return -EMSGSIZE;
3904 }
3905
3906 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3907 struct prefix_info *pinfo)
3908 {
3909 struct sk_buff *skb;
3910 struct net *net = dev_net(idev->dev);
3911 int err = -ENOBUFS;
3912
3913 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3914 if (skb == NULL)
3915 goto errout;
3916
3917 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3918 if (err < 0) {
3919 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3920 WARN_ON(err == -EMSGSIZE);
3921 kfree_skb(skb);
3922 goto errout;
3923 }
3924 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3925 return;
3926 errout:
3927 if (err < 0)
3928 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3929 }
3930
3931 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3932 {
3933 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3934
3935 switch (event) {
3936 case RTM_NEWADDR:
3937 /*
3938 * If the address was optimistic
3939 * we inserted the route at the start of
3940 * our DAD process, so we don't need
3941 * to do it again
3942 */
3943 if (!(ifp->rt->rt6i_node))
3944 ip6_ins_rt(ifp->rt);
3945 if (ifp->idev->cnf.forwarding)
3946 addrconf_join_anycast(ifp);
3947 break;
3948 case RTM_DELADDR:
3949 if (ifp->idev->cnf.forwarding)
3950 addrconf_leave_anycast(ifp);
3951 addrconf_leave_solict(ifp->idev, &ifp->addr);
3952 dst_hold(&ifp->rt->u.dst);
3953 if (ip6_del_rt(ifp->rt))
3954 dst_free(&ifp->rt->u.dst);
3955 break;
3956 }
3957 }
3958
3959 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3960 {
3961 rcu_read_lock_bh();
3962 if (likely(ifp->idev->dead == 0))
3963 __ipv6_ifa_notify(event, ifp);
3964 rcu_read_unlock_bh();
3965 }
3966
3967 #ifdef CONFIG_SYSCTL
3968
3969 static
3970 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3971 void __user *buffer, size_t *lenp, loff_t *ppos)
3972 {
3973 int *valp = ctl->data;
3974 int val = *valp;
3975 int ret;
3976
3977 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3978
3979 if (write)
3980 ret = addrconf_fixup_forwarding(ctl, valp, val);
3981 return ret;
3982 }
3983
3984 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3985 void __user *oldval,
3986 size_t __user *oldlenp,
3987 void __user *newval, size_t newlen)
3988 {
3989 int *valp = table->data;
3990 int val = *valp;
3991 int new;
3992
3993 if (!newval || !newlen)
3994 return 0;
3995 if (newlen != sizeof(int))
3996 return -EINVAL;
3997 if (get_user(new, (int __user *)newval))
3998 return -EFAULT;
3999 if (new == *valp)
4000 return 0;
4001 if (oldval && oldlenp) {
4002 size_t len;
4003 if (get_user(len, oldlenp))
4004 return -EFAULT;
4005 if (len) {
4006 if (len > table->maxlen)
4007 len = table->maxlen;
4008 if (copy_to_user(oldval, valp, len))
4009 return -EFAULT;
4010 if (put_user(len, oldlenp))
4011 return -EFAULT;
4012 }
4013 }
4014
4015 *valp = new;
4016 return addrconf_fixup_forwarding(table, valp, val);
4017 }
4018
4019 static void dev_disable_change(struct inet6_dev *idev)
4020 {
4021 if (!idev || !idev->dev)
4022 return;
4023
4024 if (idev->cnf.disable_ipv6)
4025 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4026 else
4027 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4028 }
4029
4030 static void addrconf_disable_change(struct net *net, __s32 newf)
4031 {
4032 struct net_device *dev;
4033 struct inet6_dev *idev;
4034
4035 read_lock(&dev_base_lock);
4036 for_each_netdev(net, dev) {
4037 rcu_read_lock();
4038 idev = __in6_dev_get(dev);
4039 if (idev) {
4040 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4041 idev->cnf.disable_ipv6 = newf;
4042 if (changed)
4043 dev_disable_change(idev);
4044 }
4045 rcu_read_unlock();
4046 }
4047 read_unlock(&dev_base_lock);
4048 }
4049
4050 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4051 {
4052 struct net *net;
4053
4054 net = (struct net *)table->extra2;
4055
4056 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4057 return 0;
4058
4059 if (!rtnl_trylock())
4060 return restart_syscall();
4061
4062 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4063 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4064 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4065 addrconf_disable_change(net, newf);
4066 } else if ((!*p) ^ (!old))
4067 dev_disable_change((struct inet6_dev *)table->extra1);
4068
4069 rtnl_unlock();
4070 return 0;
4071 }
4072
4073 static
4074 int addrconf_sysctl_disable(ctl_table *ctl, int write, struct file * filp,
4075 void __user *buffer, size_t *lenp, loff_t *ppos)
4076 {
4077 int *valp = ctl->data;
4078 int val = *valp;
4079 int ret;
4080
4081 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
4082
4083 if (write)
4084 ret = addrconf_disable_ipv6(ctl, valp, val);
4085 return ret;
4086 }
4087
4088 static struct addrconf_sysctl_table
4089 {
4090 struct ctl_table_header *sysctl_header;
4091 ctl_table addrconf_vars[DEVCONF_MAX+1];
4092 char *dev_name;
4093 } addrconf_sysctl __read_mostly = {
4094 .sysctl_header = NULL,
4095 .addrconf_vars = {
4096 {
4097 .ctl_name = NET_IPV6_FORWARDING,
4098 .procname = "forwarding",
4099 .data = &ipv6_devconf.forwarding,
4100 .maxlen = sizeof(int),
4101 .mode = 0644,
4102 .proc_handler = addrconf_sysctl_forward,
4103 .strategy = addrconf_sysctl_forward_strategy,
4104 },
4105 {
4106 .ctl_name = NET_IPV6_HOP_LIMIT,
4107 .procname = "hop_limit",
4108 .data = &ipv6_devconf.hop_limit,
4109 .maxlen = sizeof(int),
4110 .mode = 0644,
4111 .proc_handler = proc_dointvec,
4112 },
4113 {
4114 .ctl_name = NET_IPV6_MTU,
4115 .procname = "mtu",
4116 .data = &ipv6_devconf.mtu6,
4117 .maxlen = sizeof(int),
4118 .mode = 0644,
4119 .proc_handler = proc_dointvec,
4120 },
4121 {
4122 .ctl_name = NET_IPV6_ACCEPT_RA,
4123 .procname = "accept_ra",
4124 .data = &ipv6_devconf.accept_ra,
4125 .maxlen = sizeof(int),
4126 .mode = 0644,
4127 .proc_handler = proc_dointvec,
4128 },
4129 {
4130 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
4131 .procname = "accept_redirects",
4132 .data = &ipv6_devconf.accept_redirects,
4133 .maxlen = sizeof(int),
4134 .mode = 0644,
4135 .proc_handler = proc_dointvec,
4136 },
4137 {
4138 .ctl_name = NET_IPV6_AUTOCONF,
4139 .procname = "autoconf",
4140 .data = &ipv6_devconf.autoconf,
4141 .maxlen = sizeof(int),
4142 .mode = 0644,
4143 .proc_handler = proc_dointvec,
4144 },
4145 {
4146 .ctl_name = NET_IPV6_DAD_TRANSMITS,
4147 .procname = "dad_transmits",
4148 .data = &ipv6_devconf.dad_transmits,
4149 .maxlen = sizeof(int),
4150 .mode = 0644,
4151 .proc_handler = proc_dointvec,
4152 },
4153 {
4154 .ctl_name = NET_IPV6_RTR_SOLICITS,
4155 .procname = "router_solicitations",
4156 .data = &ipv6_devconf.rtr_solicits,
4157 .maxlen = sizeof(int),
4158 .mode = 0644,
4159 .proc_handler = proc_dointvec,
4160 },
4161 {
4162 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
4163 .procname = "router_solicitation_interval",
4164 .data = &ipv6_devconf.rtr_solicit_interval,
4165 .maxlen = sizeof(int),
4166 .mode = 0644,
4167 .proc_handler = proc_dointvec_jiffies,
4168 .strategy = sysctl_jiffies,
4169 },
4170 {
4171 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
4172 .procname = "router_solicitation_delay",
4173 .data = &ipv6_devconf.rtr_solicit_delay,
4174 .maxlen = sizeof(int),
4175 .mode = 0644,
4176 .proc_handler = proc_dointvec_jiffies,
4177 .strategy = sysctl_jiffies,
4178 },
4179 {
4180 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
4181 .procname = "force_mld_version",
4182 .data = &ipv6_devconf.force_mld_version,
4183 .maxlen = sizeof(int),
4184 .mode = 0644,
4185 .proc_handler = proc_dointvec,
4186 },
4187 #ifdef CONFIG_IPV6_PRIVACY
4188 {
4189 .ctl_name = NET_IPV6_USE_TEMPADDR,
4190 .procname = "use_tempaddr",
4191 .data = &ipv6_devconf.use_tempaddr,
4192 .maxlen = sizeof(int),
4193 .mode = 0644,
4194 .proc_handler = proc_dointvec,
4195 },
4196 {
4197 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
4198 .procname = "temp_valid_lft",
4199 .data = &ipv6_devconf.temp_valid_lft,
4200 .maxlen = sizeof(int),
4201 .mode = 0644,
4202 .proc_handler = proc_dointvec,
4203 },
4204 {
4205 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4206 .procname = "temp_prefered_lft",
4207 .data = &ipv6_devconf.temp_prefered_lft,
4208 .maxlen = sizeof(int),
4209 .mode = 0644,
4210 .proc_handler = proc_dointvec,
4211 },
4212 {
4213 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4214 .procname = "regen_max_retry",
4215 .data = &ipv6_devconf.regen_max_retry,
4216 .maxlen = sizeof(int),
4217 .mode = 0644,
4218 .proc_handler = proc_dointvec,
4219 },
4220 {
4221 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4222 .procname = "max_desync_factor",
4223 .data = &ipv6_devconf.max_desync_factor,
4224 .maxlen = sizeof(int),
4225 .mode = 0644,
4226 .proc_handler = proc_dointvec,
4227 },
4228 #endif
4229 {
4230 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4231 .procname = "max_addresses",
4232 .data = &ipv6_devconf.max_addresses,
4233 .maxlen = sizeof(int),
4234 .mode = 0644,
4235 .proc_handler = proc_dointvec,
4236 },
4237 {
4238 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4239 .procname = "accept_ra_defrtr",
4240 .data = &ipv6_devconf.accept_ra_defrtr,
4241 .maxlen = sizeof(int),
4242 .mode = 0644,
4243 .proc_handler = proc_dointvec,
4244 },
4245 {
4246 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4247 .procname = "accept_ra_pinfo",
4248 .data = &ipv6_devconf.accept_ra_pinfo,
4249 .maxlen = sizeof(int),
4250 .mode = 0644,
4251 .proc_handler = proc_dointvec,
4252 },
4253 #ifdef CONFIG_IPV6_ROUTER_PREF
4254 {
4255 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4256 .procname = "accept_ra_rtr_pref",
4257 .data = &ipv6_devconf.accept_ra_rtr_pref,
4258 .maxlen = sizeof(int),
4259 .mode = 0644,
4260 .proc_handler = proc_dointvec,
4261 },
4262 {
4263 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4264 .procname = "router_probe_interval",
4265 .data = &ipv6_devconf.rtr_probe_interval,
4266 .maxlen = sizeof(int),
4267 .mode = 0644,
4268 .proc_handler = proc_dointvec_jiffies,
4269 .strategy = sysctl_jiffies,
4270 },
4271 #ifdef CONFIG_IPV6_ROUTE_INFO
4272 {
4273 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4274 .procname = "accept_ra_rt_info_max_plen",
4275 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4276 .maxlen = sizeof(int),
4277 .mode = 0644,
4278 .proc_handler = proc_dointvec,
4279 },
4280 #endif
4281 #endif
4282 {
4283 .ctl_name = NET_IPV6_PROXY_NDP,
4284 .procname = "proxy_ndp",
4285 .data = &ipv6_devconf.proxy_ndp,
4286 .maxlen = sizeof(int),
4287 .mode = 0644,
4288 .proc_handler = proc_dointvec,
4289 },
4290 {
4291 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4292 .procname = "accept_source_route",
4293 .data = &ipv6_devconf.accept_source_route,
4294 .maxlen = sizeof(int),
4295 .mode = 0644,
4296 .proc_handler = proc_dointvec,
4297 },
4298 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4299 {
4300 .ctl_name = CTL_UNNUMBERED,
4301 .procname = "optimistic_dad",
4302 .data = &ipv6_devconf.optimistic_dad,
4303 .maxlen = sizeof(int),
4304 .mode = 0644,
4305 .proc_handler = proc_dointvec,
4306
4307 },
4308 #endif
4309 #ifdef CONFIG_IPV6_MROUTE
4310 {
4311 .ctl_name = CTL_UNNUMBERED,
4312 .procname = "mc_forwarding",
4313 .data = &ipv6_devconf.mc_forwarding,
4314 .maxlen = sizeof(int),
4315 .mode = 0444,
4316 .proc_handler = proc_dointvec,
4317 },
4318 #endif
4319 {
4320 .ctl_name = CTL_UNNUMBERED,
4321 .procname = "disable_ipv6",
4322 .data = &ipv6_devconf.disable_ipv6,
4323 .maxlen = sizeof(int),
4324 .mode = 0644,
4325 .proc_handler = addrconf_sysctl_disable,
4326 .strategy = sysctl_intvec,
4327 },
4328 {
4329 .ctl_name = CTL_UNNUMBERED,
4330 .procname = "accept_dad",
4331 .data = &ipv6_devconf.accept_dad,
4332 .maxlen = sizeof(int),
4333 .mode = 0644,
4334 .proc_handler = proc_dointvec,
4335 },
4336 {
4337 .ctl_name = 0, /* sentinel */
4338 }
4339 },
4340 };
4341
4342 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4343 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4344 {
4345 int i;
4346 struct addrconf_sysctl_table *t;
4347
4348 #define ADDRCONF_CTL_PATH_DEV 3
4349
4350 struct ctl_path addrconf_ctl_path[] = {
4351 { .procname = "net", .ctl_name = CTL_NET, },
4352 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4353 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4354 { /* to be set */ },
4355 { },
4356 };
4357
4358
4359 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4360 if (t == NULL)
4361 goto out;
4362
4363 for (i=0; t->addrconf_vars[i].data; i++) {
4364 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4365 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4366 t->addrconf_vars[i].extra2 = net;
4367 }
4368
4369 /*
4370 * Make a copy of dev_name, because '.procname' is regarded as const
4371 * by sysctl and we wouldn't want anyone to change it under our feet
4372 * (see SIOCSIFNAME).
4373 */
4374 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4375 if (!t->dev_name)
4376 goto free;
4377
4378 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4379 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4380
4381 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4382 t->addrconf_vars);
4383 if (t->sysctl_header == NULL)
4384 goto free_procname;
4385
4386 p->sysctl = t;
4387 return 0;
4388
4389 free_procname:
4390 kfree(t->dev_name);
4391 free:
4392 kfree(t);
4393 out:
4394 return -ENOBUFS;
4395 }
4396
4397 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4398 {
4399 struct addrconf_sysctl_table *t;
4400
4401 if (p->sysctl == NULL)
4402 return;
4403
4404 t = p->sysctl;
4405 p->sysctl = NULL;
4406 unregister_sysctl_table(t->sysctl_header);
4407 kfree(t->dev_name);
4408 kfree(t);
4409 }
4410
4411 static void addrconf_sysctl_register(struct inet6_dev *idev)
4412 {
4413 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4414 NET_IPV6_NEIGH, "ipv6",
4415 &ndisc_ifinfo_sysctl_change,
4416 ndisc_ifinfo_sysctl_strategy);
4417 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4418 idev->dev->ifindex, idev, &idev->cnf);
4419 }
4420
4421 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4422 {
4423 __addrconf_sysctl_unregister(&idev->cnf);
4424 neigh_sysctl_unregister(idev->nd_parms);
4425 }
4426
4427
4428 #endif
4429
4430 static int addrconf_init_net(struct net *net)
4431 {
4432 int err;
4433 struct ipv6_devconf *all, *dflt;
4434
4435 err = -ENOMEM;
4436 all = &ipv6_devconf;
4437 dflt = &ipv6_devconf_dflt;
4438
4439 if (net != &init_net) {
4440 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4441 if (all == NULL)
4442 goto err_alloc_all;
4443
4444 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4445 if (dflt == NULL)
4446 goto err_alloc_dflt;
4447 } else {
4448 /* these will be inherited by all namespaces */
4449 dflt->autoconf = ipv6_defaults.autoconf;
4450 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4451 }
4452
4453 net->ipv6.devconf_all = all;
4454 net->ipv6.devconf_dflt = dflt;
4455
4456 #ifdef CONFIG_SYSCTL
4457 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4458 NULL, all);
4459 if (err < 0)
4460 goto err_reg_all;
4461
4462 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4463 NULL, dflt);
4464 if (err < 0)
4465 goto err_reg_dflt;
4466 #endif
4467 return 0;
4468
4469 #ifdef CONFIG_SYSCTL
4470 err_reg_dflt:
4471 __addrconf_sysctl_unregister(all);
4472 err_reg_all:
4473 kfree(dflt);
4474 #endif
4475 err_alloc_dflt:
4476 kfree(all);
4477 err_alloc_all:
4478 return err;
4479 }
4480
4481 static void addrconf_exit_net(struct net *net)
4482 {
4483 #ifdef CONFIG_SYSCTL
4484 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4485 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4486 #endif
4487 if (net != &init_net) {
4488 kfree(net->ipv6.devconf_dflt);
4489 kfree(net->ipv6.devconf_all);
4490 }
4491 }
4492
4493 static struct pernet_operations addrconf_ops = {
4494 .init = addrconf_init_net,
4495 .exit = addrconf_exit_net,
4496 };
4497
4498 /*
4499 * Device notifier
4500 */
4501
4502 int register_inet6addr_notifier(struct notifier_block *nb)
4503 {
4504 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4505 }
4506
4507 EXPORT_SYMBOL(register_inet6addr_notifier);
4508
4509 int unregister_inet6addr_notifier(struct notifier_block *nb)
4510 {
4511 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4512 }
4513
4514 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4515
4516 /*
4517 * Init / cleanup code
4518 */
4519
4520 int __init addrconf_init(void)
4521 {
4522 int err;
4523
4524 if ((err = ipv6_addr_label_init()) < 0) {
4525 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4526 err);
4527 return err;
4528 }
4529
4530 register_pernet_subsys(&addrconf_ops);
4531
4532 /* The addrconf netdev notifier requires that loopback_dev
4533 * has it's ipv6 private information allocated and setup
4534 * before it can bring up and give link-local addresses
4535 * to other devices which are up.
4536 *
4537 * Unfortunately, loopback_dev is not necessarily the first
4538 * entry in the global dev_base list of net devices. In fact,
4539 * it is likely to be the very last entry on that list.
4540 * So this causes the notifier registry below to try and
4541 * give link-local addresses to all devices besides loopback_dev
4542 * first, then loopback_dev, which cases all the non-loopback_dev
4543 * devices to fail to get a link-local address.
4544 *
4545 * So, as a temporary fix, allocate the ipv6 structure for
4546 * loopback_dev first by hand.
4547 * Longer term, all of the dependencies ipv6 has upon the loopback
4548 * device and it being up should be removed.
4549 */
4550 rtnl_lock();
4551 if (!ipv6_add_dev(init_net.loopback_dev))
4552 err = -ENOMEM;
4553 rtnl_unlock();
4554 if (err)
4555 goto errlo;
4556
4557 register_netdevice_notifier(&ipv6_dev_notf);
4558
4559 addrconf_verify(0);
4560
4561 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4562 if (err < 0)
4563 goto errout;
4564
4565 /* Only the first call to __rtnl_register can fail */
4566 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4567 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4568 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4569 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4570 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4571
4572 ipv6_addr_label_rtnl_register();
4573
4574 return 0;
4575 errout:
4576 unregister_netdevice_notifier(&ipv6_dev_notf);
4577 errlo:
4578 unregister_pernet_subsys(&addrconf_ops);
4579
4580 return err;
4581 }
4582
4583 void addrconf_cleanup(void)
4584 {
4585 struct inet6_ifaddr *ifa;
4586 struct net_device *dev;
4587 int i;
4588
4589 unregister_netdevice_notifier(&ipv6_dev_notf);
4590 unregister_pernet_subsys(&addrconf_ops);
4591
4592 rtnl_lock();
4593
4594 /* clean dev list */
4595 for_each_netdev(&init_net, dev) {
4596 if (__in6_dev_get(dev) == NULL)
4597 continue;
4598 addrconf_ifdown(dev, 1);
4599 }
4600 addrconf_ifdown(init_net.loopback_dev, 2);
4601
4602 /*
4603 * Check hash table.
4604 */
4605 write_lock_bh(&addrconf_hash_lock);
4606 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4607 for (ifa=inet6_addr_lst[i]; ifa; ) {
4608 struct inet6_ifaddr *bifa;
4609
4610 bifa = ifa;
4611 ifa = ifa->lst_next;
4612 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4613 /* Do not free it; something is wrong.
4614 Now we can investigate it with debugger.
4615 */
4616 }
4617 }
4618 write_unlock_bh(&addrconf_hash_lock);
4619
4620 del_timer(&addr_chk_timer);
4621 rtnl_unlock();
4622 }
Linux kernel - Deliverables
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