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IPv6: addrconf timer race
[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 void addrconf_bonding_change(struct net_device *dev,
141 unsigned long event);
142 static int addrconf_ifdown(struct net_device *dev, int how);
143
144 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
145 static void addrconf_dad_timer(unsigned long data);
146 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
147 static void addrconf_dad_run(struct inet6_dev *idev);
148 static void addrconf_rs_timer(unsigned long data);
149 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
150 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
151
152 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
153 struct prefix_info *pinfo);
154 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
155 struct net_device *dev);
156
157 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
158
159 static struct ipv6_devconf ipv6_devconf __read_mostly = {
160 .forwarding = 0,
161 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
162 .mtu6 = IPV6_MIN_MTU,
163 .accept_ra = 1,
164 .accept_redirects = 1,
165 .autoconf = 1,
166 .force_mld_version = 0,
167 .dad_transmits = 1,
168 .rtr_solicits = MAX_RTR_SOLICITATIONS,
169 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
170 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
171 #ifdef CONFIG_IPV6_PRIVACY
172 .use_tempaddr = 0,
173 .temp_valid_lft = TEMP_VALID_LIFETIME,
174 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
175 .regen_max_retry = REGEN_MAX_RETRY,
176 .max_desync_factor = MAX_DESYNC_FACTOR,
177 #endif
178 .max_addresses = IPV6_MAX_ADDRESSES,
179 .accept_ra_defrtr = 1,
180 .accept_ra_pinfo = 1,
181 #ifdef CONFIG_IPV6_ROUTER_PREF
182 .accept_ra_rtr_pref = 1,
183 .rtr_probe_interval = 60 * HZ,
184 #ifdef CONFIG_IPV6_ROUTE_INFO
185 .accept_ra_rt_info_max_plen = 0,
186 #endif
187 #endif
188 .proxy_ndp = 0,
189 .accept_source_route = 0, /* we do not accept RH0 by default. */
190 .disable_ipv6 = 0,
191 .accept_dad = 1,
192 };
193
194 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
195 .forwarding = 0,
196 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
197 .mtu6 = IPV6_MIN_MTU,
198 .accept_ra = 1,
199 .accept_redirects = 1,
200 .autoconf = 1,
201 .dad_transmits = 1,
202 .rtr_solicits = MAX_RTR_SOLICITATIONS,
203 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
205 #ifdef CONFIG_IPV6_PRIVACY
206 .use_tempaddr = 0,
207 .temp_valid_lft = TEMP_VALID_LIFETIME,
208 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
209 .regen_max_retry = REGEN_MAX_RETRY,
210 .max_desync_factor = MAX_DESYNC_FACTOR,
211 #endif
212 .max_addresses = IPV6_MAX_ADDRESSES,
213 .accept_ra_defrtr = 1,
214 .accept_ra_pinfo = 1,
215 #ifdef CONFIG_IPV6_ROUTER_PREF
216 .accept_ra_rtr_pref = 1,
217 .rtr_probe_interval = 60 * HZ,
218 #ifdef CONFIG_IPV6_ROUTE_INFO
219 .accept_ra_rt_info_max_plen = 0,
220 #endif
221 #endif
222 .proxy_ndp = 0,
223 .accept_source_route = 0, /* we do not accept RH0 by default. */
224 .disable_ipv6 = 0,
225 .accept_dad = 1,
226 };
227
228 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
229 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
230 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
231 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
232 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
233
234 /* Check if a valid qdisc is available */
235 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
236 {
237 return !qdisc_tx_is_noop(dev);
238 }
239
240 /* Check if a route is valid prefix route */
241 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
242 {
243 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
244 }
245
246 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
247 {
248 if (del_timer(&ifp->timer))
249 __in6_ifa_put(ifp);
250 }
251
252 enum addrconf_timer_t
253 {
254 AC_NONE,
255 AC_DAD,
256 AC_RS,
257 };
258
259 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
260 enum addrconf_timer_t what,
261 unsigned long when)
262 {
263 if (!del_timer(&ifp->timer))
264 in6_ifa_hold(ifp);
265
266 switch (what) {
267 case AC_DAD:
268 ifp->timer.function = addrconf_dad_timer;
269 break;
270 case AC_RS:
271 ifp->timer.function = addrconf_rs_timer;
272 break;
273 default:;
274 }
275 ifp->timer.expires = jiffies + when;
276 add_timer(&ifp->timer);
277 }
278
279 static int snmp6_alloc_dev(struct inet6_dev *idev)
280 {
281 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
282 sizeof(struct ipstats_mib)) < 0)
283 goto err_ip;
284 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
285 sizeof(struct icmpv6_mib)) < 0)
286 goto err_icmp;
287 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
288 sizeof(struct icmpv6msg_mib)) < 0)
289 goto err_icmpmsg;
290
291 return 0;
292
293 err_icmpmsg:
294 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
295 err_icmp:
296 snmp_mib_free((void __percpu **)idev->stats.ipv6);
297 err_ip:
298 return -ENOMEM;
299 }
300
301 static void snmp6_free_dev(struct inet6_dev *idev)
302 {
303 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
304 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
305 snmp_mib_free((void __percpu **)idev->stats.ipv6);
306 }
307
308 /* Nobody refers to this device, we may destroy it. */
309
310 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
311 {
312 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
313 kfree(idev);
314 }
315
316 void in6_dev_finish_destroy(struct inet6_dev *idev)
317 {
318 struct net_device *dev = idev->dev;
319
320 WARN_ON(idev->addr_list != NULL);
321 WARN_ON(idev->mc_list != NULL);
322
323 #ifdef NET_REFCNT_DEBUG
324 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
325 #endif
326 dev_put(dev);
327 if (!idev->dead) {
328 printk("Freeing alive inet6 device %p\n", idev);
329 return;
330 }
331 snmp6_free_dev(idev);
332 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
333 }
334
335 EXPORT_SYMBOL(in6_dev_finish_destroy);
336
337 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
338 {
339 struct inet6_dev *ndev;
340
341 ASSERT_RTNL();
342
343 if (dev->mtu < IPV6_MIN_MTU)
344 return NULL;
345
346 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
347
348 if (ndev == NULL)
349 return NULL;
350
351 rwlock_init(&ndev->lock);
352 ndev->dev = dev;
353 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
354 ndev->cnf.mtu6 = dev->mtu;
355 ndev->cnf.sysctl = NULL;
356 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
357 if (ndev->nd_parms == NULL) {
358 kfree(ndev);
359 return NULL;
360 }
361 if (ndev->cnf.forwarding)
362 dev_disable_lro(dev);
363 /* We refer to the device */
364 dev_hold(dev);
365
366 if (snmp6_alloc_dev(ndev) < 0) {
367 ADBG((KERN_WARNING
368 "%s(): cannot allocate memory for statistics; dev=%s.\n",
369 __func__, dev->name));
370 neigh_parms_release(&nd_tbl, ndev->nd_parms);
371 ndev->dead = 1;
372 in6_dev_finish_destroy(ndev);
373 return NULL;
374 }
375
376 if (snmp6_register_dev(ndev) < 0) {
377 ADBG((KERN_WARNING
378 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
379 __func__, dev->name));
380 neigh_parms_release(&nd_tbl, ndev->nd_parms);
381 ndev->dead = 1;
382 in6_dev_finish_destroy(ndev);
383 return NULL;
384 }
385
386 /* One reference from device. We must do this before
387 * we invoke __ipv6_regen_rndid().
388 */
389 in6_dev_hold(ndev);
390
391 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
392 ndev->cnf.accept_dad = -1;
393
394 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
395 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
396 printk(KERN_INFO
397 "%s: Disabled Multicast RS\n",
398 dev->name);
399 ndev->cnf.rtr_solicits = 0;
400 }
401 #endif
402
403 #ifdef CONFIG_IPV6_PRIVACY
404 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
405 if ((dev->flags&IFF_LOOPBACK) ||
406 dev->type == ARPHRD_TUNNEL ||
407 dev->type == ARPHRD_TUNNEL6 ||
408 dev->type == ARPHRD_SIT ||
409 dev->type == ARPHRD_NONE) {
410 printk(KERN_INFO
411 "%s: Disabled Privacy Extensions\n",
412 dev->name);
413 ndev->cnf.use_tempaddr = -1;
414 } else {
415 in6_dev_hold(ndev);
416 ipv6_regen_rndid((unsigned long) ndev);
417 }
418 #endif
419
420 if (netif_running(dev) && addrconf_qdisc_ok(dev))
421 ndev->if_flags |= IF_READY;
422
423 ipv6_mc_init_dev(ndev);
424 ndev->tstamp = jiffies;
425 addrconf_sysctl_register(ndev);
426 /* protected by rtnl_lock */
427 rcu_assign_pointer(dev->ip6_ptr, ndev);
428
429 /* Join all-node multicast group */
430 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
431
432 return ndev;
433 }
434
435 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
436 {
437 struct inet6_dev *idev;
438
439 ASSERT_RTNL();
440
441 if ((idev = __in6_dev_get(dev)) == NULL) {
442 if ((idev = ipv6_add_dev(dev)) == NULL)
443 return NULL;
444 }
445
446 if (dev->flags&IFF_UP)
447 ipv6_mc_up(idev);
448 return idev;
449 }
450
451 #ifdef CONFIG_SYSCTL
452 static void dev_forward_change(struct inet6_dev *idev)
453 {
454 struct net_device *dev;
455 struct inet6_ifaddr *ifa;
456
457 if (!idev)
458 return;
459 dev = idev->dev;
460 if (idev->cnf.forwarding)
461 dev_disable_lro(dev);
462 if (dev && (dev->flags & IFF_MULTICAST)) {
463 if (idev->cnf.forwarding)
464 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
465 else
466 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
467 }
468 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
469 if (ifa->flags&IFA_F_TENTATIVE)
470 continue;
471 if (idev->cnf.forwarding)
472 addrconf_join_anycast(ifa);
473 else
474 addrconf_leave_anycast(ifa);
475 }
476 }
477
478
479 static void addrconf_forward_change(struct net *net, __s32 newf)
480 {
481 struct net_device *dev;
482 struct inet6_dev *idev;
483
484 rcu_read_lock();
485 for_each_netdev_rcu(net, dev) {
486 idev = __in6_dev_get(dev);
487 if (idev) {
488 int changed = (!idev->cnf.forwarding) ^ (!newf);
489 idev->cnf.forwarding = newf;
490 if (changed)
491 dev_forward_change(idev);
492 }
493 }
494 rcu_read_unlock();
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 /* Restore the original values before restarting */
507 *p = old;
508 return restart_syscall();
509 }
510
511 if (p == &net->ipv6.devconf_all->forwarding) {
512 __s32 newf = net->ipv6.devconf_all->forwarding;
513 net->ipv6.devconf_dflt->forwarding = newf;
514 addrconf_forward_change(net, newf);
515 } else if ((!*p) ^ (!old))
516 dev_forward_change((struct inet6_dev *)table->extra1);
517 rtnl_unlock();
518
519 if (*p)
520 rt6_purge_dflt_routers(net);
521 return 1;
522 }
523 #endif
524
525 /* Nobody refers to this ifaddr, destroy it */
526
527 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
528 {
529 WARN_ON(ifp->if_next != NULL);
530 WARN_ON(ifp->lst_next != NULL);
531
532 #ifdef NET_REFCNT_DEBUG
533 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
534 #endif
535
536 in6_dev_put(ifp->idev);
537
538 if (del_timer(&ifp->timer))
539 printk("Timer is still running, when freeing ifa=%p\n", ifp);
540
541 if (!ifp->dead) {
542 printk("Freeing alive inet6 address %p\n", ifp);
543 return;
544 }
545 dst_release(&ifp->rt->u.dst);
546
547 kfree(ifp);
548 }
549
550 static void
551 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
552 {
553 struct inet6_ifaddr *ifa, **ifap;
554 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
555
556 /*
557 * Each device address list is sorted in order of scope -
558 * global before linklocal.
559 */
560 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
561 ifap = &ifa->if_next) {
562 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
563 break;
564 }
565
566 ifp->if_next = *ifap;
567 *ifap = ifp;
568 }
569
570 /*
571 * Hash function taken from net_alias.c
572 */
573 static u8 ipv6_addr_hash(const struct in6_addr *addr)
574 {
575 __u32 word;
576
577 /*
578 * We perform the hash function over the last 64 bits of the address
579 * This will include the IEEE address token on links that support it.
580 */
581
582 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
583 word ^= (word >> 16);
584 word ^= (word >> 8);
585
586 return ((word ^ (word >> 4)) & 0x0f);
587 }
588
589 /* On success it returns ifp with increased reference count */
590
591 static struct inet6_ifaddr *
592 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
593 int scope, u32 flags)
594 {
595 struct inet6_ifaddr *ifa = NULL;
596 struct rt6_info *rt;
597 int hash;
598 int err = 0;
599 int addr_type = ipv6_addr_type(addr);
600
601 if (addr_type == IPV6_ADDR_ANY ||
602 addr_type & IPV6_ADDR_MULTICAST ||
603 (!(idev->dev->flags & IFF_LOOPBACK) &&
604 addr_type & IPV6_ADDR_LOOPBACK))
605 return ERR_PTR(-EADDRNOTAVAIL);
606
607 rcu_read_lock_bh();
608 if (idev->dead) {
609 err = -ENODEV; /*XXX*/
610 goto out2;
611 }
612
613 if (idev->cnf.disable_ipv6) {
614 err = -EACCES;
615 goto out2;
616 }
617
618 write_lock(&addrconf_hash_lock);
619
620 /* Ignore adding duplicate addresses on an interface */
621 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
622 ADBG(("ipv6_add_addr: already assigned\n"));
623 err = -EEXIST;
624 goto out;
625 }
626
627 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
628
629 if (ifa == NULL) {
630 ADBG(("ipv6_add_addr: malloc failed\n"));
631 err = -ENOBUFS;
632 goto out;
633 }
634
635 rt = addrconf_dst_alloc(idev, addr, 0);
636 if (IS_ERR(rt)) {
637 err = PTR_ERR(rt);
638 goto out;
639 }
640
641 ipv6_addr_copy(&ifa->addr, addr);
642
643 spin_lock_init(&ifa->lock);
644 init_timer(&ifa->timer);
645 ifa->timer.data = (unsigned long) ifa;
646 ifa->scope = scope;
647 ifa->prefix_len = pfxlen;
648 ifa->flags = flags | IFA_F_TENTATIVE;
649 ifa->cstamp = ifa->tstamp = jiffies;
650
651 ifa->rt = rt;
652
653 /*
654 * part one of RFC 4429, section 3.3
655 * We should not configure an address as
656 * optimistic if we do not yet know the link
657 * layer address of our nexhop router
658 */
659
660 if (rt->rt6i_nexthop == NULL)
661 ifa->flags &= ~IFA_F_OPTIMISTIC;
662
663 ifa->idev = idev;
664 in6_dev_hold(idev);
665 /* For caller */
666 in6_ifa_hold(ifa);
667
668 /* Add to big hash table */
669 hash = ipv6_addr_hash(addr);
670
671 ifa->lst_next = inet6_addr_lst[hash];
672 inet6_addr_lst[hash] = ifa;
673 in6_ifa_hold(ifa);
674 write_unlock(&addrconf_hash_lock);
675
676 write_lock(&idev->lock);
677 /* Add to inet6_dev unicast addr list. */
678 ipv6_link_dev_addr(idev, ifa);
679
680 #ifdef CONFIG_IPV6_PRIVACY
681 if (ifa->flags&IFA_F_TEMPORARY) {
682 ifa->tmp_next = idev->tempaddr_list;
683 idev->tempaddr_list = ifa;
684 in6_ifa_hold(ifa);
685 }
686 #endif
687
688 in6_ifa_hold(ifa);
689 write_unlock(&idev->lock);
690 out2:
691 rcu_read_unlock_bh();
692
693 if (likely(err == 0))
694 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
695 else {
696 kfree(ifa);
697 ifa = ERR_PTR(err);
698 }
699
700 return ifa;
701 out:
702 write_unlock(&addrconf_hash_lock);
703 goto out2;
704 }
705
706 /* This function wants to get referenced ifp and releases it before return */
707
708 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
709 {
710 struct inet6_ifaddr *ifa, **ifap;
711 struct inet6_dev *idev = ifp->idev;
712 int hash;
713 int deleted = 0, onlink = 0;
714 unsigned long expires = jiffies;
715
716 hash = ipv6_addr_hash(&ifp->addr);
717
718 ifp->dead = 1;
719
720 write_lock_bh(&addrconf_hash_lock);
721 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
722 ifap = &ifa->lst_next) {
723 if (ifa == ifp) {
724 *ifap = ifa->lst_next;
725 __in6_ifa_put(ifp);
726 ifa->lst_next = NULL;
727 break;
728 }
729 }
730 write_unlock_bh(&addrconf_hash_lock);
731
732 write_lock_bh(&idev->lock);
733 #ifdef CONFIG_IPV6_PRIVACY
734 if (ifp->flags&IFA_F_TEMPORARY) {
735 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
736 ifap = &ifa->tmp_next) {
737 if (ifa == ifp) {
738 *ifap = ifa->tmp_next;
739 if (ifp->ifpub) {
740 in6_ifa_put(ifp->ifpub);
741 ifp->ifpub = NULL;
742 }
743 __in6_ifa_put(ifp);
744 ifa->tmp_next = NULL;
745 break;
746 }
747 }
748 }
749 #endif
750
751 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
752 if (ifa == ifp) {
753 *ifap = ifa->if_next;
754 __in6_ifa_put(ifp);
755 ifa->if_next = NULL;
756 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
757 break;
758 deleted = 1;
759 continue;
760 } else if (ifp->flags & IFA_F_PERMANENT) {
761 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
762 ifp->prefix_len)) {
763 if (ifa->flags & IFA_F_PERMANENT) {
764 onlink = 1;
765 if (deleted)
766 break;
767 } else {
768 unsigned long lifetime;
769
770 if (!onlink)
771 onlink = -1;
772
773 spin_lock(&ifa->lock);
774
775 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
776 /*
777 * Note: Because this address is
778 * not permanent, lifetime <
779 * LONG_MAX / HZ here.
780 */
781 if (time_before(expires,
782 ifa->tstamp + lifetime * HZ))
783 expires = ifa->tstamp + lifetime * HZ;
784 spin_unlock(&ifa->lock);
785 }
786 }
787 }
788 ifap = &ifa->if_next;
789 }
790 write_unlock_bh(&idev->lock);
791
792 addrconf_del_timer(ifp);
793
794 ipv6_ifa_notify(RTM_DELADDR, ifp);
795
796 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
797
798 /*
799 * Purge or update corresponding prefix
800 *
801 * 1) we don't purge prefix here if address was not permanent.
802 * prefix is managed by its own lifetime.
803 * 2) if there're no addresses, delete prefix.
804 * 3) if there're still other permanent address(es),
805 * corresponding prefix is still permanent.
806 * 4) otherwise, update prefix lifetime to the
807 * longest valid lifetime among the corresponding
808 * addresses on the device.
809 * Note: subsequent RA will update lifetime.
810 *
811 * --yoshfuji
812 */
813 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
814 struct in6_addr prefix;
815 struct rt6_info *rt;
816 struct net *net = dev_net(ifp->idev->dev);
817 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
818 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
819
820 if (rt && addrconf_is_prefix_route(rt)) {
821 if (onlink == 0) {
822 ip6_del_rt(rt);
823 rt = NULL;
824 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
825 rt->rt6i_expires = expires;
826 rt->rt6i_flags |= RTF_EXPIRES;
827 }
828 }
829 dst_release(&rt->u.dst);
830 }
831
832 in6_ifa_put(ifp);
833 }
834
835 #ifdef CONFIG_IPV6_PRIVACY
836 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
837 {
838 struct inet6_dev *idev = ifp->idev;
839 struct in6_addr addr, *tmpaddr;
840 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
841 unsigned long regen_advance;
842 int tmp_plen;
843 int ret = 0;
844 int max_addresses;
845 u32 addr_flags;
846
847 write_lock(&idev->lock);
848 if (ift) {
849 spin_lock_bh(&ift->lock);
850 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
851 spin_unlock_bh(&ift->lock);
852 tmpaddr = &addr;
853 } else {
854 tmpaddr = NULL;
855 }
856 retry:
857 in6_dev_hold(idev);
858 if (idev->cnf.use_tempaddr <= 0) {
859 write_unlock(&idev->lock);
860 printk(KERN_INFO
861 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
862 in6_dev_put(idev);
863 ret = -1;
864 goto out;
865 }
866 spin_lock_bh(&ifp->lock);
867 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
868 idev->cnf.use_tempaddr = -1; /*XXX*/
869 spin_unlock_bh(&ifp->lock);
870 write_unlock(&idev->lock);
871 printk(KERN_WARNING
872 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
873 in6_dev_put(idev);
874 ret = -1;
875 goto out;
876 }
877 in6_ifa_hold(ifp);
878 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
879 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
880 spin_unlock_bh(&ifp->lock);
881 write_unlock(&idev->lock);
882 printk(KERN_WARNING
883 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
884 in6_ifa_put(ifp);
885 in6_dev_put(idev);
886 ret = -1;
887 goto out;
888 }
889 memcpy(&addr.s6_addr[8], idev->rndid, 8);
890 tmp_valid_lft = min_t(__u32,
891 ifp->valid_lft,
892 idev->cnf.temp_valid_lft);
893 tmp_prefered_lft = min_t(__u32,
894 ifp->prefered_lft,
895 idev->cnf.temp_prefered_lft - desync_factor / HZ);
896 tmp_plen = ifp->prefix_len;
897 max_addresses = idev->cnf.max_addresses;
898 tmp_cstamp = ifp->cstamp;
899 tmp_tstamp = ifp->tstamp;
900 spin_unlock_bh(&ifp->lock);
901
902 regen_advance = idev->cnf.regen_max_retry *
903 idev->cnf.dad_transmits *
904 idev->nd_parms->retrans_time / HZ;
905 write_unlock(&idev->lock);
906
907 /* A temporary address is created only if this calculated Preferred
908 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
909 * an implementation must not create a temporary address with a zero
910 * Preferred Lifetime.
911 */
912 if (tmp_prefered_lft <= regen_advance) {
913 in6_ifa_put(ifp);
914 in6_dev_put(idev);
915 ret = -1;
916 goto out;
917 }
918
919 addr_flags = IFA_F_TEMPORARY;
920 /* set in addrconf_prefix_rcv() */
921 if (ifp->flags & IFA_F_OPTIMISTIC)
922 addr_flags |= IFA_F_OPTIMISTIC;
923
924 ift = !max_addresses ||
925 ipv6_count_addresses(idev) < max_addresses ?
926 ipv6_add_addr(idev, &addr, tmp_plen,
927 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
928 addr_flags) : NULL;
929 if (!ift || IS_ERR(ift)) {
930 in6_ifa_put(ifp);
931 in6_dev_put(idev);
932 printk(KERN_INFO
933 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
934 tmpaddr = &addr;
935 write_lock(&idev->lock);
936 goto retry;
937 }
938
939 spin_lock_bh(&ift->lock);
940 ift->ifpub = ifp;
941 ift->valid_lft = tmp_valid_lft;
942 ift->prefered_lft = tmp_prefered_lft;
943 ift->cstamp = tmp_cstamp;
944 ift->tstamp = tmp_tstamp;
945 spin_unlock_bh(&ift->lock);
946
947 addrconf_dad_start(ift, 0);
948 in6_ifa_put(ift);
949 in6_dev_put(idev);
950 out:
951 return ret;
952 }
953 #endif
954
955 /*
956 * Choose an appropriate source address (RFC3484)
957 */
958 enum {
959 IPV6_SADDR_RULE_INIT = 0,
960 IPV6_SADDR_RULE_LOCAL,
961 IPV6_SADDR_RULE_SCOPE,
962 IPV6_SADDR_RULE_PREFERRED,
963 #ifdef CONFIG_IPV6_MIP6
964 IPV6_SADDR_RULE_HOA,
965 #endif
966 IPV6_SADDR_RULE_OIF,
967 IPV6_SADDR_RULE_LABEL,
968 #ifdef CONFIG_IPV6_PRIVACY
969 IPV6_SADDR_RULE_PRIVACY,
970 #endif
971 IPV6_SADDR_RULE_ORCHID,
972 IPV6_SADDR_RULE_PREFIX,
973 IPV6_SADDR_RULE_MAX
974 };
975
976 struct ipv6_saddr_score {
977 int rule;
978 int addr_type;
979 struct inet6_ifaddr *ifa;
980 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
981 int scopedist;
982 int matchlen;
983 };
984
985 struct ipv6_saddr_dst {
986 const struct in6_addr *addr;
987 int ifindex;
988 int scope;
989 int label;
990 unsigned int prefs;
991 };
992
993 static inline int ipv6_saddr_preferred(int type)
994 {
995 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
996 return 1;
997 return 0;
998 }
999
1000 static int ipv6_get_saddr_eval(struct net *net,
1001 struct ipv6_saddr_score *score,
1002 struct ipv6_saddr_dst *dst,
1003 int i)
1004 {
1005 int ret;
1006
1007 if (i <= score->rule) {
1008 switch (i) {
1009 case IPV6_SADDR_RULE_SCOPE:
1010 ret = score->scopedist;
1011 break;
1012 case IPV6_SADDR_RULE_PREFIX:
1013 ret = score->matchlen;
1014 break;
1015 default:
1016 ret = !!test_bit(i, score->scorebits);
1017 }
1018 goto out;
1019 }
1020
1021 switch (i) {
1022 case IPV6_SADDR_RULE_INIT:
1023 /* Rule 0: remember if hiscore is not ready yet */
1024 ret = !!score->ifa;
1025 break;
1026 case IPV6_SADDR_RULE_LOCAL:
1027 /* Rule 1: Prefer same address */
1028 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1029 break;
1030 case IPV6_SADDR_RULE_SCOPE:
1031 /* Rule 2: Prefer appropriate scope
1032 *
1033 * ret
1034 * ^
1035 * -1 | d 15
1036 * ---+--+-+---> scope
1037 * |
1038 * | d is scope of the destination.
1039 * B-d | \
1040 * | \ <- smaller scope is better if
1041 * B-15 | \ if scope is enough for destinaion.
1042 * | ret = B - scope (-1 <= scope >= d <= 15).
1043 * d-C-1 | /
1044 * |/ <- greater is better
1045 * -C / if scope is not enough for destination.
1046 * /| ret = scope - C (-1 <= d < scope <= 15).
1047 *
1048 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1049 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1050 * Assume B = 0 and we get C > 29.
1051 */
1052 ret = __ipv6_addr_src_scope(score->addr_type);
1053 if (ret >= dst->scope)
1054 ret = -ret;
1055 else
1056 ret -= 128; /* 30 is enough */
1057 score->scopedist = ret;
1058 break;
1059 case IPV6_SADDR_RULE_PREFERRED:
1060 /* Rule 3: Avoid deprecated and optimistic addresses */
1061 ret = ipv6_saddr_preferred(score->addr_type) ||
1062 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1063 break;
1064 #ifdef CONFIG_IPV6_MIP6
1065 case IPV6_SADDR_RULE_HOA:
1066 {
1067 /* Rule 4: Prefer home address */
1068 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1069 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1070 break;
1071 }
1072 #endif
1073 case IPV6_SADDR_RULE_OIF:
1074 /* Rule 5: Prefer outgoing interface */
1075 ret = (!dst->ifindex ||
1076 dst->ifindex == score->ifa->idev->dev->ifindex);
1077 break;
1078 case IPV6_SADDR_RULE_LABEL:
1079 /* Rule 6: Prefer matching label */
1080 ret = ipv6_addr_label(net,
1081 &score->ifa->addr, score->addr_type,
1082 score->ifa->idev->dev->ifindex) == dst->label;
1083 break;
1084 #ifdef CONFIG_IPV6_PRIVACY
1085 case IPV6_SADDR_RULE_PRIVACY:
1086 {
1087 /* Rule 7: Prefer public address
1088 * Note: prefer temprary address if use_tempaddr >= 2
1089 */
1090 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1091 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1092 score->ifa->idev->cnf.use_tempaddr >= 2;
1093 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1094 break;
1095 }
1096 #endif
1097 case IPV6_SADDR_RULE_ORCHID:
1098 /* Rule 8-: Prefer ORCHID vs ORCHID or
1099 * non-ORCHID vs non-ORCHID
1100 */
1101 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1102 ipv6_addr_orchid(dst->addr));
1103 break;
1104 case IPV6_SADDR_RULE_PREFIX:
1105 /* Rule 8: Use longest matching prefix */
1106 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1107 dst->addr);
1108 break;
1109 default:
1110 ret = 0;
1111 }
1112
1113 if (ret)
1114 __set_bit(i, score->scorebits);
1115 score->rule = i;
1116 out:
1117 return ret;
1118 }
1119
1120 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1121 const struct in6_addr *daddr, unsigned int prefs,
1122 struct in6_addr *saddr)
1123 {
1124 struct ipv6_saddr_score scores[2],
1125 *score = &scores[0], *hiscore = &scores[1];
1126 struct ipv6_saddr_dst dst;
1127 struct net_device *dev;
1128 int dst_type;
1129
1130 dst_type = __ipv6_addr_type(daddr);
1131 dst.addr = daddr;
1132 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1133 dst.scope = __ipv6_addr_src_scope(dst_type);
1134 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1135 dst.prefs = prefs;
1136
1137 hiscore->rule = -1;
1138 hiscore->ifa = NULL;
1139
1140 rcu_read_lock();
1141
1142 for_each_netdev_rcu(net, dev) {
1143 struct inet6_dev *idev;
1144
1145 /* Candidate Source Address (section 4)
1146 * - multicast and link-local destination address,
1147 * the set of candidate source address MUST only
1148 * include addresses assigned to interfaces
1149 * belonging to the same link as the outgoing
1150 * interface.
1151 * (- For site-local destination addresses, the
1152 * set of candidate source addresses MUST only
1153 * include addresses assigned to interfaces
1154 * belonging to the same site as the outgoing
1155 * interface.)
1156 */
1157 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1158 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1159 dst.ifindex && dev->ifindex != dst.ifindex)
1160 continue;
1161
1162 idev = __in6_dev_get(dev);
1163 if (!idev)
1164 continue;
1165
1166 read_lock_bh(&idev->lock);
1167 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1168 int i;
1169
1170 /*
1171 * - Tentative Address (RFC2462 section 5.4)
1172 * - A tentative address is not considered
1173 * "assigned to an interface" in the traditional
1174 * sense, unless it is also flagged as optimistic.
1175 * - Candidate Source Address (section 4)
1176 * - In any case, anycast addresses, multicast
1177 * addresses, and the unspecified address MUST
1178 * NOT be included in a candidate set.
1179 */
1180 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1181 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1182 continue;
1183
1184 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1185
1186 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1187 score->addr_type & IPV6_ADDR_MULTICAST)) {
1188 LIMIT_NETDEBUG(KERN_DEBUG
1189 "ADDRCONF: unspecified / multicast address "
1190 "assigned as unicast address on %s",
1191 dev->name);
1192 continue;
1193 }
1194
1195 score->rule = -1;
1196 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1197
1198 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1199 int minihiscore, miniscore;
1200
1201 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1202 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1203
1204 if (minihiscore > miniscore) {
1205 if (i == IPV6_SADDR_RULE_SCOPE &&
1206 score->scopedist > 0) {
1207 /*
1208 * special case:
1209 * each remaining entry
1210 * has too small (not enough)
1211 * scope, because ifa entries
1212 * are sorted by their scope
1213 * values.
1214 */
1215 goto try_nextdev;
1216 }
1217 break;
1218 } else if (minihiscore < miniscore) {
1219 if (hiscore->ifa)
1220 in6_ifa_put(hiscore->ifa);
1221
1222 in6_ifa_hold(score->ifa);
1223
1224 swap(hiscore, score);
1225
1226 /* restore our iterator */
1227 score->ifa = hiscore->ifa;
1228
1229 break;
1230 }
1231 }
1232 }
1233 try_nextdev:
1234 read_unlock_bh(&idev->lock);
1235 }
1236 rcu_read_unlock();
1237
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 %pI6c detected!\n",
1409 ifp->idev->dev->name, &ifp->addr);
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 case NETDEV_BONDING_OLDTYPE:
2586 case NETDEV_BONDING_NEWTYPE:
2587 addrconf_bonding_change(dev, event);
2588 break;
2589 }
2590
2591 return NOTIFY_OK;
2592 }
2593
2594 /*
2595 * addrconf module should be notified of a device going up
2596 */
2597 static struct notifier_block ipv6_dev_notf = {
2598 .notifier_call = addrconf_notify,
2599 .priority = 0
2600 };
2601
2602 static void addrconf_bonding_change(struct net_device *dev, unsigned long event)
2603 {
2604 struct inet6_dev *idev;
2605 ASSERT_RTNL();
2606
2607 idev = __in6_dev_get(dev);
2608
2609 if (event == NETDEV_BONDING_NEWTYPE)
2610 ipv6_mc_remap(idev);
2611 else if (event == NETDEV_BONDING_OLDTYPE)
2612 ipv6_mc_unmap(idev);
2613 }
2614
2615 static int addrconf_ifdown(struct net_device *dev, int how)
2616 {
2617 struct inet6_dev *idev;
2618 struct inet6_ifaddr *ifa, **bifa;
2619 struct net *net = dev_net(dev);
2620 int i;
2621
2622 ASSERT_RTNL();
2623
2624 rt6_ifdown(net, dev);
2625 neigh_ifdown(&nd_tbl, dev);
2626
2627 idev = __in6_dev_get(dev);
2628 if (idev == NULL)
2629 return -ENODEV;
2630
2631 /* Step 1: remove reference to ipv6 device from parent device.
2632 Do not dev_put!
2633 */
2634 if (how) {
2635 idev->dead = 1;
2636
2637 /* protected by rtnl_lock */
2638 rcu_assign_pointer(dev->ip6_ptr, NULL);
2639
2640 /* Step 1.5: remove snmp6 entry */
2641 snmp6_unregister_dev(idev);
2642
2643 }
2644
2645 /* Step 2: clear hash table */
2646 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2647 bifa = &inet6_addr_lst[i];
2648
2649 write_lock_bh(&addrconf_hash_lock);
2650 while ((ifa = *bifa) != NULL) {
2651 if (ifa->idev == idev &&
2652 (how || !(ifa->flags&IFA_F_PERMANENT))) {
2653 *bifa = ifa->lst_next;
2654 ifa->lst_next = NULL;
2655 addrconf_del_timer(ifa);
2656 in6_ifa_put(ifa);
2657 continue;
2658 }
2659 bifa = &ifa->lst_next;
2660 }
2661 write_unlock_bh(&addrconf_hash_lock);
2662 }
2663
2664 write_lock_bh(&idev->lock);
2665
2666 /* Step 3: clear flags for stateless addrconf */
2667 if (!how)
2668 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2669
2670 /* Step 4: clear address list */
2671 #ifdef CONFIG_IPV6_PRIVACY
2672 if (how && del_timer(&idev->regen_timer))
2673 in6_dev_put(idev);
2674
2675 /* clear tempaddr list */
2676 while ((ifa = idev->tempaddr_list) != NULL) {
2677 idev->tempaddr_list = ifa->tmp_next;
2678 ifa->tmp_next = NULL;
2679 ifa->dead = 1;
2680 write_unlock_bh(&idev->lock);
2681 spin_lock_bh(&ifa->lock);
2682
2683 if (ifa->ifpub) {
2684 in6_ifa_put(ifa->ifpub);
2685 ifa->ifpub = NULL;
2686 }
2687 spin_unlock_bh(&ifa->lock);
2688 in6_ifa_put(ifa);
2689 write_lock_bh(&idev->lock);
2690 }
2691 #endif
2692 bifa = &idev->addr_list;
2693 while ((ifa = *bifa) != NULL) {
2694 if (how == 0 && (ifa->flags&IFA_F_PERMANENT)) {
2695 /* Retain permanent address on admin down */
2696 bifa = &ifa->if_next;
2697
2698 /* Restart DAD if needed when link comes back up */
2699 if ( !((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2700 idev->cnf.accept_dad <= 0 ||
2701 (ifa->flags & IFA_F_NODAD)))
2702 ifa->flags |= IFA_F_TENTATIVE;
2703 } else {
2704 *bifa = ifa->if_next;
2705 ifa->if_next = NULL;
2706
2707 ifa->dead = 1;
2708 write_unlock_bh(&idev->lock);
2709
2710 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2711 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2712 in6_ifa_put(ifa);
2713
2714 write_lock_bh(&idev->lock);
2715 }
2716 }
2717 write_unlock_bh(&idev->lock);
2718
2719 /* Step 5: Discard multicast list */
2720
2721 if (how)
2722 ipv6_mc_destroy_dev(idev);
2723 else
2724 ipv6_mc_down(idev);
2725
2726 idev->tstamp = jiffies;
2727
2728 /* Shot the device (if unregistered) */
2729
2730 if (how) {
2731 addrconf_sysctl_unregister(idev);
2732 neigh_parms_release(&nd_tbl, idev->nd_parms);
2733 neigh_ifdown(&nd_tbl, dev);
2734 in6_dev_put(idev);
2735 }
2736 return 0;
2737 }
2738
2739 static void addrconf_rs_timer(unsigned long data)
2740 {
2741 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2742 struct inet6_dev *idev = ifp->idev;
2743
2744 read_lock(&idev->lock);
2745 if (idev->dead || !(idev->if_flags & IF_READY))
2746 goto out;
2747
2748 if (idev->cnf.forwarding)
2749 goto out;
2750
2751 /* Announcement received after solicitation was sent */
2752 if (idev->if_flags & IF_RA_RCVD)
2753 goto out;
2754
2755 spin_lock(&ifp->lock);
2756 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2757 /* The wait after the last probe can be shorter */
2758 addrconf_mod_timer(ifp, AC_RS,
2759 (ifp->probes == idev->cnf.rtr_solicits) ?
2760 idev->cnf.rtr_solicit_delay :
2761 idev->cnf.rtr_solicit_interval);
2762 spin_unlock(&ifp->lock);
2763
2764 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2765 } else {
2766 spin_unlock(&ifp->lock);
2767 /*
2768 * Note: we do not support deprecated "all on-link"
2769 * assumption any longer.
2770 */
2771 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2772 idev->dev->name);
2773 }
2774
2775 out:
2776 read_unlock(&idev->lock);
2777 in6_ifa_put(ifp);
2778 }
2779
2780 /*
2781 * Duplicate Address Detection
2782 */
2783 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2784 {
2785 unsigned long rand_num;
2786 struct inet6_dev *idev = ifp->idev;
2787
2788 if (ifp->flags & IFA_F_OPTIMISTIC)
2789 rand_num = 0;
2790 else
2791 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2792
2793 ifp->probes = idev->cnf.dad_transmits;
2794 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2795 }
2796
2797 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2798 {
2799 struct inet6_dev *idev = ifp->idev;
2800 struct net_device *dev = idev->dev;
2801
2802 addrconf_join_solict(dev, &ifp->addr);
2803
2804 net_srandom(ifp->addr.s6_addr32[3]);
2805
2806 read_lock_bh(&idev->lock);
2807 if (ifp->dead)
2808 goto out;
2809
2810 spin_lock(&ifp->lock);
2811 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2812 idev->cnf.accept_dad < 1 ||
2813 !(ifp->flags&IFA_F_TENTATIVE) ||
2814 ifp->flags & IFA_F_NODAD) {
2815 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2816 spin_unlock(&ifp->lock);
2817 read_unlock_bh(&idev->lock);
2818
2819 addrconf_dad_completed(ifp);
2820 return;
2821 }
2822
2823 if (!(idev->if_flags & IF_READY)) {
2824 spin_unlock(&ifp->lock);
2825 read_unlock_bh(&idev->lock);
2826 /*
2827 * If the device is not ready:
2828 * - keep it tentative if it is a permanent address.
2829 * - otherwise, kill it.
2830 */
2831 in6_ifa_hold(ifp);
2832 addrconf_dad_stop(ifp, 0);
2833 return;
2834 }
2835
2836 /*
2837 * Optimistic nodes can start receiving
2838 * Frames right away
2839 */
2840 if(ifp->flags & IFA_F_OPTIMISTIC)
2841 ip6_ins_rt(ifp->rt);
2842
2843 addrconf_dad_kick(ifp);
2844 spin_unlock(&ifp->lock);
2845 out:
2846 read_unlock_bh(&idev->lock);
2847 }
2848
2849 static void addrconf_dad_timer(unsigned long data)
2850 {
2851 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2852 struct inet6_dev *idev = ifp->idev;
2853 struct in6_addr mcaddr;
2854
2855 read_lock(&idev->lock);
2856 if (idev->dead || !(idev->if_flags & IF_READY)) {
2857 read_unlock(&idev->lock);
2858 goto out;
2859 }
2860
2861 spin_lock(&ifp->lock);
2862 if (ifp->probes == 0) {
2863 /*
2864 * DAD was successful
2865 */
2866
2867 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2868 spin_unlock(&ifp->lock);
2869 read_unlock(&idev->lock);
2870
2871 addrconf_dad_completed(ifp);
2872
2873 goto out;
2874 }
2875
2876 ifp->probes--;
2877 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2878 spin_unlock(&ifp->lock);
2879 read_unlock(&idev->lock);
2880
2881 /* send a neighbour solicitation for our addr */
2882 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2883 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2884 out:
2885 in6_ifa_put(ifp);
2886 }
2887
2888 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2889 {
2890 struct net_device * dev = ifp->idev->dev;
2891
2892 /*
2893 * Configure the address for reception. Now it is valid.
2894 */
2895
2896 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2897
2898 /* If added prefix is link local and forwarding is off,
2899 start sending router solicitations.
2900 */
2901
2902 if (ifp->idev->cnf.forwarding == 0 &&
2903 ifp->idev->cnf.rtr_solicits > 0 &&
2904 (dev->flags&IFF_LOOPBACK) == 0 &&
2905 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2906 /*
2907 * If a host as already performed a random delay
2908 * [...] as part of DAD [...] there is no need
2909 * to delay again before sending the first RS
2910 */
2911 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2912
2913 spin_lock_bh(&ifp->lock);
2914 ifp->probes = 1;
2915 ifp->idev->if_flags |= IF_RS_SENT;
2916 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2917 spin_unlock_bh(&ifp->lock);
2918 }
2919 }
2920
2921 static void addrconf_dad_run(struct inet6_dev *idev) {
2922 struct inet6_ifaddr *ifp;
2923
2924 read_lock_bh(&idev->lock);
2925 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2926 spin_lock(&ifp->lock);
2927 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2928 spin_unlock(&ifp->lock);
2929 continue;
2930 }
2931 spin_unlock(&ifp->lock);
2932 addrconf_dad_kick(ifp);
2933 }
2934 read_unlock_bh(&idev->lock);
2935 }
2936
2937 #ifdef CONFIG_PROC_FS
2938 struct if6_iter_state {
2939 struct seq_net_private p;
2940 int bucket;
2941 };
2942
2943 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2944 {
2945 struct inet6_ifaddr *ifa = NULL;
2946 struct if6_iter_state *state = seq->private;
2947 struct net *net = seq_file_net(seq);
2948
2949 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2950 ifa = inet6_addr_lst[state->bucket];
2951
2952 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2953 ifa = ifa->lst_next;
2954 if (ifa)
2955 break;
2956 }
2957 return ifa;
2958 }
2959
2960 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2961 {
2962 struct if6_iter_state *state = seq->private;
2963 struct net *net = seq_file_net(seq);
2964
2965 ifa = ifa->lst_next;
2966 try_again:
2967 if (ifa) {
2968 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2969 ifa = ifa->lst_next;
2970 goto try_again;
2971 }
2972 }
2973
2974 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2975 ifa = inet6_addr_lst[state->bucket];
2976 goto try_again;
2977 }
2978
2979 return ifa;
2980 }
2981
2982 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2983 {
2984 struct inet6_ifaddr *ifa = if6_get_first(seq);
2985
2986 if (ifa)
2987 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2988 --pos;
2989 return pos ? NULL : ifa;
2990 }
2991
2992 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2993 __acquires(addrconf_hash_lock)
2994 {
2995 read_lock_bh(&addrconf_hash_lock);
2996 return if6_get_idx(seq, *pos);
2997 }
2998
2999 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3000 {
3001 struct inet6_ifaddr *ifa;
3002
3003 ifa = if6_get_next(seq, v);
3004 ++*pos;
3005 return ifa;
3006 }
3007
3008 static void if6_seq_stop(struct seq_file *seq, void *v)
3009 __releases(addrconf_hash_lock)
3010 {
3011 read_unlock_bh(&addrconf_hash_lock);
3012 }
3013
3014 static int if6_seq_show(struct seq_file *seq, void *v)
3015 {
3016 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3017 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3018 &ifp->addr,
3019 ifp->idev->dev->ifindex,
3020 ifp->prefix_len,
3021 ifp->scope,
3022 ifp->flags,
3023 ifp->idev->dev->name);
3024 return 0;
3025 }
3026
3027 static const struct seq_operations if6_seq_ops = {
3028 .start = if6_seq_start,
3029 .next = if6_seq_next,
3030 .show = if6_seq_show,
3031 .stop = if6_seq_stop,
3032 };
3033
3034 static int if6_seq_open(struct inode *inode, struct file *file)
3035 {
3036 return seq_open_net(inode, file, &if6_seq_ops,
3037 sizeof(struct if6_iter_state));
3038 }
3039
3040 static const struct file_operations if6_fops = {
3041 .owner = THIS_MODULE,
3042 .open = if6_seq_open,
3043 .read = seq_read,
3044 .llseek = seq_lseek,
3045 .release = seq_release_net,
3046 };
3047
3048 static int __net_init if6_proc_net_init(struct net *net)
3049 {
3050 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3051 return -ENOMEM;
3052 return 0;
3053 }
3054
3055 static void __net_exit if6_proc_net_exit(struct net *net)
3056 {
3057 proc_net_remove(net, "if_inet6");
3058 }
3059
3060 static struct pernet_operations if6_proc_net_ops = {
3061 .init = if6_proc_net_init,
3062 .exit = if6_proc_net_exit,
3063 };
3064
3065 int __init if6_proc_init(void)
3066 {
3067 return register_pernet_subsys(&if6_proc_net_ops);
3068 }
3069
3070 void if6_proc_exit(void)
3071 {
3072 unregister_pernet_subsys(&if6_proc_net_ops);
3073 }
3074 #endif /* CONFIG_PROC_FS */
3075
3076 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3077 /* Check if address is a home address configured on any interface. */
3078 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3079 {
3080 int ret = 0;
3081 struct inet6_ifaddr * ifp;
3082 u8 hash = ipv6_addr_hash(addr);
3083 read_lock_bh(&addrconf_hash_lock);
3084 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3085 if (!net_eq(dev_net(ifp->idev->dev), net))
3086 continue;
3087 if (ipv6_addr_equal(&ifp->addr, addr) &&
3088 (ifp->flags & IFA_F_HOMEADDRESS)) {
3089 ret = 1;
3090 break;
3091 }
3092 }
3093 read_unlock_bh(&addrconf_hash_lock);
3094 return ret;
3095 }
3096 #endif
3097
3098 /*
3099 * Periodic address status verification
3100 */
3101
3102 static void addrconf_verify(unsigned long foo)
3103 {
3104 struct inet6_ifaddr *ifp;
3105 unsigned long now, next;
3106 int i;
3107
3108 spin_lock_bh(&addrconf_verify_lock);
3109 now = jiffies;
3110 next = now + ADDR_CHECK_FREQUENCY;
3111
3112 del_timer(&addr_chk_timer);
3113
3114 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3115
3116 restart:
3117 read_lock(&addrconf_hash_lock);
3118 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3119 unsigned long age;
3120 #ifdef CONFIG_IPV6_PRIVACY
3121 unsigned long regen_advance;
3122 #endif
3123
3124 if (ifp->flags & IFA_F_PERMANENT)
3125 continue;
3126
3127 spin_lock(&ifp->lock);
3128 age = (now - ifp->tstamp) / HZ;
3129
3130 #ifdef CONFIG_IPV6_PRIVACY
3131 regen_advance = ifp->idev->cnf.regen_max_retry *
3132 ifp->idev->cnf.dad_transmits *
3133 ifp->idev->nd_parms->retrans_time / HZ;
3134 #endif
3135
3136 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3137 age >= ifp->valid_lft) {
3138 spin_unlock(&ifp->lock);
3139 in6_ifa_hold(ifp);
3140 read_unlock(&addrconf_hash_lock);
3141 ipv6_del_addr(ifp);
3142 goto restart;
3143 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3144 spin_unlock(&ifp->lock);
3145 continue;
3146 } else if (age >= ifp->prefered_lft) {
3147 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3148 int deprecate = 0;
3149
3150 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3151 deprecate = 1;
3152 ifp->flags |= IFA_F_DEPRECATED;
3153 }
3154
3155 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3156 next = ifp->tstamp + ifp->valid_lft * HZ;
3157
3158 spin_unlock(&ifp->lock);
3159
3160 if (deprecate) {
3161 in6_ifa_hold(ifp);
3162 read_unlock(&addrconf_hash_lock);
3163
3164 ipv6_ifa_notify(0, ifp);
3165 in6_ifa_put(ifp);
3166 goto restart;
3167 }
3168 #ifdef CONFIG_IPV6_PRIVACY
3169 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3170 !(ifp->flags&IFA_F_TENTATIVE)) {
3171 if (age >= ifp->prefered_lft - regen_advance) {
3172 struct inet6_ifaddr *ifpub = ifp->ifpub;
3173 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3174 next = ifp->tstamp + ifp->prefered_lft * HZ;
3175 if (!ifp->regen_count && ifpub) {
3176 ifp->regen_count++;
3177 in6_ifa_hold(ifp);
3178 in6_ifa_hold(ifpub);
3179 spin_unlock(&ifp->lock);
3180 read_unlock(&addrconf_hash_lock);
3181 spin_lock(&ifpub->lock);
3182 ifpub->regen_count = 0;
3183 spin_unlock(&ifpub->lock);
3184 ipv6_create_tempaddr(ifpub, ifp);
3185 in6_ifa_put(ifpub);
3186 in6_ifa_put(ifp);
3187 goto restart;
3188 }
3189 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3190 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3191 spin_unlock(&ifp->lock);
3192 #endif
3193 } else {
3194 /* ifp->prefered_lft <= ifp->valid_lft */
3195 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3196 next = ifp->tstamp + ifp->prefered_lft * HZ;
3197 spin_unlock(&ifp->lock);
3198 }
3199 }
3200 read_unlock(&addrconf_hash_lock);
3201 }
3202
3203 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3204 add_timer(&addr_chk_timer);
3205 spin_unlock_bh(&addrconf_verify_lock);
3206 }
3207
3208 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3209 {
3210 struct in6_addr *pfx = NULL;
3211
3212 if (addr)
3213 pfx = nla_data(addr);
3214
3215 if (local) {
3216 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3217 pfx = NULL;
3218 else
3219 pfx = nla_data(local);
3220 }
3221
3222 return pfx;
3223 }
3224
3225 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3226 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3227 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3228 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3229 };
3230
3231 static int
3232 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3233 {
3234 struct net *net = sock_net(skb->sk);
3235 struct ifaddrmsg *ifm;
3236 struct nlattr *tb[IFA_MAX+1];
3237 struct in6_addr *pfx;
3238 int err;
3239
3240 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3241 if (err < 0)
3242 return err;
3243
3244 ifm = nlmsg_data(nlh);
3245 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3246 if (pfx == NULL)
3247 return -EINVAL;
3248
3249 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3250 }
3251
3252 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3253 u32 prefered_lft, u32 valid_lft)
3254 {
3255 u32 flags;
3256 clock_t expires;
3257 unsigned long timeout;
3258
3259 if (!valid_lft || (prefered_lft > valid_lft))
3260 return -EINVAL;
3261
3262 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3263 if (addrconf_finite_timeout(timeout)) {
3264 expires = jiffies_to_clock_t(timeout * HZ);
3265 valid_lft = timeout;
3266 flags = RTF_EXPIRES;
3267 } else {
3268 expires = 0;
3269 flags = 0;
3270 ifa_flags |= IFA_F_PERMANENT;
3271 }
3272
3273 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3274 if (addrconf_finite_timeout(timeout)) {
3275 if (timeout == 0)
3276 ifa_flags |= IFA_F_DEPRECATED;
3277 prefered_lft = timeout;
3278 }
3279
3280 spin_lock_bh(&ifp->lock);
3281 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3282 ifp->tstamp = jiffies;
3283 ifp->valid_lft = valid_lft;
3284 ifp->prefered_lft = prefered_lft;
3285
3286 spin_unlock_bh(&ifp->lock);
3287 if (!(ifp->flags&IFA_F_TENTATIVE))
3288 ipv6_ifa_notify(0, ifp);
3289
3290 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3291 expires, flags);
3292 addrconf_verify(0);
3293
3294 return 0;
3295 }
3296
3297 static int
3298 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3299 {
3300 struct net *net = sock_net(skb->sk);
3301 struct ifaddrmsg *ifm;
3302 struct nlattr *tb[IFA_MAX+1];
3303 struct in6_addr *pfx;
3304 struct inet6_ifaddr *ifa;
3305 struct net_device *dev;
3306 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3307 u8 ifa_flags;
3308 int err;
3309
3310 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3311 if (err < 0)
3312 return err;
3313
3314 ifm = nlmsg_data(nlh);
3315 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3316 if (pfx == NULL)
3317 return -EINVAL;
3318
3319 if (tb[IFA_CACHEINFO]) {
3320 struct ifa_cacheinfo *ci;
3321
3322 ci = nla_data(tb[IFA_CACHEINFO]);
3323 valid_lft = ci->ifa_valid;
3324 preferred_lft = ci->ifa_prefered;
3325 } else {
3326 preferred_lft = INFINITY_LIFE_TIME;
3327 valid_lft = INFINITY_LIFE_TIME;
3328 }
3329
3330 dev = __dev_get_by_index(net, ifm->ifa_index);
3331 if (dev == NULL)
3332 return -ENODEV;
3333
3334 /* We ignore other flags so far. */
3335 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3336
3337 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3338 if (ifa == NULL) {
3339 /*
3340 * It would be best to check for !NLM_F_CREATE here but
3341 * userspace alreay relies on not having to provide this.
3342 */
3343 return inet6_addr_add(net, ifm->ifa_index, pfx,
3344 ifm->ifa_prefixlen, ifa_flags,
3345 preferred_lft, valid_lft);
3346 }
3347
3348 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3349 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3350 err = -EEXIST;
3351 else
3352 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3353
3354 in6_ifa_put(ifa);
3355
3356 return err;
3357 }
3358
3359 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3360 u8 scope, int ifindex)
3361 {
3362 struct ifaddrmsg *ifm;
3363
3364 ifm = nlmsg_data(nlh);
3365 ifm->ifa_family = AF_INET6;
3366 ifm->ifa_prefixlen = prefixlen;
3367 ifm->ifa_flags = flags;
3368 ifm->ifa_scope = scope;
3369 ifm->ifa_index = ifindex;
3370 }
3371
3372 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3373 unsigned long tstamp, u32 preferred, u32 valid)
3374 {
3375 struct ifa_cacheinfo ci;
3376
3377 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3378 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3379 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3380 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3381 ci.ifa_prefered = preferred;
3382 ci.ifa_valid = valid;
3383
3384 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3385 }
3386
3387 static inline int rt_scope(int ifa_scope)
3388 {
3389 if (ifa_scope & IFA_HOST)
3390 return RT_SCOPE_HOST;
3391 else if (ifa_scope & IFA_LINK)
3392 return RT_SCOPE_LINK;
3393 else if (ifa_scope & IFA_SITE)
3394 return RT_SCOPE_SITE;
3395 else
3396 return RT_SCOPE_UNIVERSE;
3397 }
3398
3399 static inline int inet6_ifaddr_msgsize(void)
3400 {
3401 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3402 + nla_total_size(16) /* IFA_ADDRESS */
3403 + nla_total_size(sizeof(struct ifa_cacheinfo));
3404 }
3405
3406 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3407 u32 pid, u32 seq, int event, unsigned int flags)
3408 {
3409 struct nlmsghdr *nlh;
3410 u32 preferred, valid;
3411
3412 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3413 if (nlh == NULL)
3414 return -EMSGSIZE;
3415
3416 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3417 ifa->idev->dev->ifindex);
3418
3419 if (!(ifa->flags&IFA_F_PERMANENT)) {
3420 preferred = ifa->prefered_lft;
3421 valid = ifa->valid_lft;
3422 if (preferred != INFINITY_LIFE_TIME) {
3423 long tval = (jiffies - ifa->tstamp)/HZ;
3424 if (preferred > tval)
3425 preferred -= tval;
3426 else
3427 preferred = 0;
3428 if (valid != INFINITY_LIFE_TIME)
3429 valid -= tval;
3430 }
3431 } else {
3432 preferred = INFINITY_LIFE_TIME;
3433 valid = INFINITY_LIFE_TIME;
3434 }
3435
3436 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3437 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3438 nlmsg_cancel(skb, nlh);
3439 return -EMSGSIZE;
3440 }
3441
3442 return nlmsg_end(skb, nlh);
3443 }
3444
3445 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3446 u32 pid, u32 seq, int event, u16 flags)
3447 {
3448 struct nlmsghdr *nlh;
3449 u8 scope = RT_SCOPE_UNIVERSE;
3450 int ifindex = ifmca->idev->dev->ifindex;
3451
3452 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3453 scope = RT_SCOPE_SITE;
3454
3455 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3456 if (nlh == NULL)
3457 return -EMSGSIZE;
3458
3459 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3460 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3461 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3462 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3463 nlmsg_cancel(skb, nlh);
3464 return -EMSGSIZE;
3465 }
3466
3467 return nlmsg_end(skb, nlh);
3468 }
3469
3470 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3471 u32 pid, u32 seq, int event, unsigned int flags)
3472 {
3473 struct nlmsghdr *nlh;
3474 u8 scope = RT_SCOPE_UNIVERSE;
3475 int ifindex = ifaca->aca_idev->dev->ifindex;
3476
3477 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3478 scope = RT_SCOPE_SITE;
3479
3480 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3481 if (nlh == NULL)
3482 return -EMSGSIZE;
3483
3484 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3485 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3486 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3487 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3488 nlmsg_cancel(skb, nlh);
3489 return -EMSGSIZE;
3490 }
3491
3492 return nlmsg_end(skb, nlh);
3493 }
3494
3495 enum addr_type_t
3496 {
3497 UNICAST_ADDR,
3498 MULTICAST_ADDR,
3499 ANYCAST_ADDR,
3500 };
3501
3502 /* called with rcu_read_lock() */
3503 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3504 struct netlink_callback *cb, enum addr_type_t type,
3505 int s_ip_idx, int *p_ip_idx)
3506 {
3507 struct inet6_ifaddr *ifa;
3508 struct ifmcaddr6 *ifmca;
3509 struct ifacaddr6 *ifaca;
3510 int err = 1;
3511 int ip_idx = *p_ip_idx;
3512
3513 read_lock_bh(&idev->lock);
3514 switch (type) {
3515 case UNICAST_ADDR:
3516 /* unicast address incl. temp addr */
3517 for (ifa = idev->addr_list; ifa;
3518 ifa = ifa->if_next, ip_idx++) {
3519 if (ip_idx < s_ip_idx)
3520 continue;
3521 err = inet6_fill_ifaddr(skb, ifa,
3522 NETLINK_CB(cb->skb).pid,
3523 cb->nlh->nlmsg_seq,
3524 RTM_NEWADDR,
3525 NLM_F_MULTI);
3526 if (err <= 0)
3527 break;
3528 }
3529 break;
3530 case MULTICAST_ADDR:
3531 /* multicast address */
3532 for (ifmca = idev->mc_list; ifmca;
3533 ifmca = ifmca->next, ip_idx++) {
3534 if (ip_idx < s_ip_idx)
3535 continue;
3536 err = inet6_fill_ifmcaddr(skb, ifmca,
3537 NETLINK_CB(cb->skb).pid,
3538 cb->nlh->nlmsg_seq,
3539 RTM_GETMULTICAST,
3540 NLM_F_MULTI);
3541 if (err <= 0)
3542 break;
3543 }
3544 break;
3545 case ANYCAST_ADDR:
3546 /* anycast address */
3547 for (ifaca = idev->ac_list; ifaca;
3548 ifaca = ifaca->aca_next, ip_idx++) {
3549 if (ip_idx < s_ip_idx)
3550 continue;
3551 err = inet6_fill_ifacaddr(skb, ifaca,
3552 NETLINK_CB(cb->skb).pid,
3553 cb->nlh->nlmsg_seq,
3554 RTM_GETANYCAST,
3555 NLM_F_MULTI);
3556 if (err <= 0)
3557 break;
3558 }
3559 break;
3560 default:
3561 break;
3562 }
3563 read_unlock_bh(&idev->lock);
3564 *p_ip_idx = ip_idx;
3565 return err;
3566 }
3567
3568 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3569 enum addr_type_t type)
3570 {
3571 struct net *net = sock_net(skb->sk);
3572 int h, s_h;
3573 int idx, ip_idx;
3574 int s_idx, s_ip_idx;
3575 struct net_device *dev;
3576 struct inet6_dev *idev;
3577 struct hlist_head *head;
3578 struct hlist_node *node;
3579
3580 s_h = cb->args[0];
3581 s_idx = idx = cb->args[1];
3582 s_ip_idx = ip_idx = cb->args[2];
3583
3584 rcu_read_lock();
3585 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3586 idx = 0;
3587 head = &net->dev_index_head[h];
3588 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3589 if (idx < s_idx)
3590 goto cont;
3591 if (idx > s_idx)
3592 s_ip_idx = 0;
3593 ip_idx = 0;
3594 if ((idev = __in6_dev_get(dev)) == NULL)
3595 goto cont;
3596
3597 if (in6_dump_addrs(idev, skb, cb, type,
3598 s_ip_idx, &ip_idx) <= 0)
3599 goto done;
3600 cont:
3601 idx++;
3602 }
3603 }
3604 done:
3605 rcu_read_unlock();
3606 cb->args[0] = h;
3607 cb->args[1] = idx;
3608 cb->args[2] = ip_idx;
3609
3610 return skb->len;
3611 }
3612
3613 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3614 {
3615 enum addr_type_t type = UNICAST_ADDR;
3616
3617 return inet6_dump_addr(skb, cb, type);
3618 }
3619
3620 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3621 {
3622 enum addr_type_t type = MULTICAST_ADDR;
3623
3624 return inet6_dump_addr(skb, cb, type);
3625 }
3626
3627
3628 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3629 {
3630 enum addr_type_t type = ANYCAST_ADDR;
3631
3632 return inet6_dump_addr(skb, cb, type);
3633 }
3634
3635 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3636 void *arg)
3637 {
3638 struct net *net = sock_net(in_skb->sk);
3639 struct ifaddrmsg *ifm;
3640 struct nlattr *tb[IFA_MAX+1];
3641 struct in6_addr *addr = NULL;
3642 struct net_device *dev = NULL;
3643 struct inet6_ifaddr *ifa;
3644 struct sk_buff *skb;
3645 int err;
3646
3647 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3648 if (err < 0)
3649 goto errout;
3650
3651 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3652 if (addr == NULL) {
3653 err = -EINVAL;
3654 goto errout;
3655 }
3656
3657 ifm = nlmsg_data(nlh);
3658 if (ifm->ifa_index)
3659 dev = __dev_get_by_index(net, ifm->ifa_index);
3660
3661 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3662 err = -EADDRNOTAVAIL;
3663 goto errout;
3664 }
3665
3666 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3667 err = -ENOBUFS;
3668 goto errout_ifa;
3669 }
3670
3671 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3672 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3673 if (err < 0) {
3674 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3675 WARN_ON(err == -EMSGSIZE);
3676 kfree_skb(skb);
3677 goto errout_ifa;
3678 }
3679 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3680 errout_ifa:
3681 in6_ifa_put(ifa);
3682 errout:
3683 return err;
3684 }
3685
3686 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3687 {
3688 struct sk_buff *skb;
3689 struct net *net = dev_net(ifa->idev->dev);
3690 int err = -ENOBUFS;
3691
3692 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3693 if (skb == NULL)
3694 goto errout;
3695
3696 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3697 if (err < 0) {
3698 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3699 WARN_ON(err == -EMSGSIZE);
3700 kfree_skb(skb);
3701 goto errout;
3702 }
3703 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3704 return;
3705 errout:
3706 if (err < 0)
3707 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3708 }
3709
3710 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3711 __s32 *array, int bytes)
3712 {
3713 BUG_ON(bytes < (DEVCONF_MAX * 4));
3714
3715 memset(array, 0, bytes);
3716 array[DEVCONF_FORWARDING] = cnf->forwarding;
3717 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3718 array[DEVCONF_MTU6] = cnf->mtu6;
3719 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3720 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3721 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3722 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3723 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3724 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3725 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3726 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3727 #ifdef CONFIG_IPV6_PRIVACY
3728 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3729 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3730 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3731 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3732 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3733 #endif
3734 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3735 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3736 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3737 #ifdef CONFIG_IPV6_ROUTER_PREF
3738 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3739 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3740 #ifdef CONFIG_IPV6_ROUTE_INFO
3741 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3742 #endif
3743 #endif
3744 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3745 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3746 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3747 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3748 #endif
3749 #ifdef CONFIG_IPV6_MROUTE
3750 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3751 #endif
3752 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3753 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3754 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3755 }
3756
3757 static inline size_t inet6_if_nlmsg_size(void)
3758 {
3759 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3760 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3761 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3762 + nla_total_size(4) /* IFLA_MTU */
3763 + nla_total_size(4) /* IFLA_LINK */
3764 + nla_total_size( /* IFLA_PROTINFO */
3765 nla_total_size(4) /* IFLA_INET6_FLAGS */
3766 + nla_total_size(sizeof(struct ifla_cacheinfo))
3767 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3768 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3769 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3770 );
3771 }
3772
3773 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3774 int items, int bytes)
3775 {
3776 int i;
3777 int pad = bytes - sizeof(u64) * items;
3778 BUG_ON(pad < 0);
3779
3780 /* Use put_unaligned() because stats may not be aligned for u64. */
3781 put_unaligned(items, &stats[0]);
3782 for (i = 1; i < items; i++)
3783 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3784
3785 memset(&stats[items], 0, pad);
3786 }
3787
3788 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3789 int bytes)
3790 {
3791 switch(attrtype) {
3792 case IFLA_INET6_STATS:
3793 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3794 break;
3795 case IFLA_INET6_ICMP6STATS:
3796 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3797 break;
3798 }
3799 }
3800
3801 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3802 u32 pid, u32 seq, int event, unsigned int flags)
3803 {
3804 struct net_device *dev = idev->dev;
3805 struct nlattr *nla;
3806 struct ifinfomsg *hdr;
3807 struct nlmsghdr *nlh;
3808 void *protoinfo;
3809 struct ifla_cacheinfo ci;
3810
3811 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3812 if (nlh == NULL)
3813 return -EMSGSIZE;
3814
3815 hdr = nlmsg_data(nlh);
3816 hdr->ifi_family = AF_INET6;
3817 hdr->__ifi_pad = 0;
3818 hdr->ifi_type = dev->type;
3819 hdr->ifi_index = dev->ifindex;
3820 hdr->ifi_flags = dev_get_flags(dev);
3821 hdr->ifi_change = 0;
3822
3823 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3824
3825 if (dev->addr_len)
3826 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3827
3828 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3829 if (dev->ifindex != dev->iflink)
3830 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3831
3832 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3833 if (protoinfo == NULL)
3834 goto nla_put_failure;
3835
3836 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3837
3838 ci.max_reasm_len = IPV6_MAXPLEN;
3839 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3840 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3841 ci.reachable_time = idev->nd_parms->reachable_time;
3842 ci.retrans_time = idev->nd_parms->retrans_time;
3843 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3844
3845 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3846 if (nla == NULL)
3847 goto nla_put_failure;
3848 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3849
3850 /* XXX - MC not implemented */
3851
3852 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3853 if (nla == NULL)
3854 goto nla_put_failure;
3855 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3856
3857 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3858 if (nla == NULL)
3859 goto nla_put_failure;
3860 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3861
3862 nla_nest_end(skb, protoinfo);
3863 return nlmsg_end(skb, nlh);
3864
3865 nla_put_failure:
3866 nlmsg_cancel(skb, nlh);
3867 return -EMSGSIZE;
3868 }
3869
3870 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3871 {
3872 struct net *net = sock_net(skb->sk);
3873 int h, s_h;
3874 int idx = 0, s_idx;
3875 struct net_device *dev;
3876 struct inet6_dev *idev;
3877 struct hlist_head *head;
3878 struct hlist_node *node;
3879
3880 s_h = cb->args[0];
3881 s_idx = cb->args[1];
3882
3883 rcu_read_lock();
3884 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3885 idx = 0;
3886 head = &net->dev_index_head[h];
3887 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3888 if (idx < s_idx)
3889 goto cont;
3890 idev = __in6_dev_get(dev);
3891 if (!idev)
3892 goto cont;
3893 if (inet6_fill_ifinfo(skb, idev,
3894 NETLINK_CB(cb->skb).pid,
3895 cb->nlh->nlmsg_seq,
3896 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3897 goto out;
3898 cont:
3899 idx++;
3900 }
3901 }
3902 out:
3903 rcu_read_unlock();
3904 cb->args[1] = idx;
3905 cb->args[0] = h;
3906
3907 return skb->len;
3908 }
3909
3910 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3911 {
3912 struct sk_buff *skb;
3913 struct net *net = dev_net(idev->dev);
3914 int err = -ENOBUFS;
3915
3916 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3917 if (skb == NULL)
3918 goto errout;
3919
3920 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3921 if (err < 0) {
3922 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3923 WARN_ON(err == -EMSGSIZE);
3924 kfree_skb(skb);
3925 goto errout;
3926 }
3927 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3928 return;
3929 errout:
3930 if (err < 0)
3931 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3932 }
3933
3934 static inline size_t inet6_prefix_nlmsg_size(void)
3935 {
3936 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3937 + nla_total_size(sizeof(struct in6_addr))
3938 + nla_total_size(sizeof(struct prefix_cacheinfo));
3939 }
3940
3941 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3942 struct prefix_info *pinfo, u32 pid, u32 seq,
3943 int event, unsigned int flags)
3944 {
3945 struct prefixmsg *pmsg;
3946 struct nlmsghdr *nlh;
3947 struct prefix_cacheinfo ci;
3948
3949 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3950 if (nlh == NULL)
3951 return -EMSGSIZE;
3952
3953 pmsg = nlmsg_data(nlh);
3954 pmsg->prefix_family = AF_INET6;
3955 pmsg->prefix_pad1 = 0;
3956 pmsg->prefix_pad2 = 0;
3957 pmsg->prefix_ifindex = idev->dev->ifindex;
3958 pmsg->prefix_len = pinfo->prefix_len;
3959 pmsg->prefix_type = pinfo->type;
3960 pmsg->prefix_pad3 = 0;
3961 pmsg->prefix_flags = 0;
3962 if (pinfo->onlink)
3963 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3964 if (pinfo->autoconf)
3965 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3966
3967 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3968
3969 ci.preferred_time = ntohl(pinfo->prefered);
3970 ci.valid_time = ntohl(pinfo->valid);
3971 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3972
3973 return nlmsg_end(skb, nlh);
3974
3975 nla_put_failure:
3976 nlmsg_cancel(skb, nlh);
3977 return -EMSGSIZE;
3978 }
3979
3980 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3981 struct prefix_info *pinfo)
3982 {
3983 struct sk_buff *skb;
3984 struct net *net = dev_net(idev->dev);
3985 int err = -ENOBUFS;
3986
3987 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3988 if (skb == NULL)
3989 goto errout;
3990
3991 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3992 if (err < 0) {
3993 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3994 WARN_ON(err == -EMSGSIZE);
3995 kfree_skb(skb);
3996 goto errout;
3997 }
3998 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3999 return;
4000 errout:
4001 if (err < 0)
4002 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4003 }
4004
4005 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4006 {
4007 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4008
4009 switch (event) {
4010 case RTM_NEWADDR:
4011 /*
4012 * If the address was optimistic
4013 * we inserted the route at the start of
4014 * our DAD process, so we don't need
4015 * to do it again
4016 */
4017 if (!(ifp->rt->rt6i_node))
4018 ip6_ins_rt(ifp->rt);
4019 if (ifp->idev->cnf.forwarding)
4020 addrconf_join_anycast(ifp);
4021 break;
4022 case RTM_DELADDR:
4023 if (ifp->idev->cnf.forwarding)
4024 addrconf_leave_anycast(ifp);
4025 addrconf_leave_solict(ifp->idev, &ifp->addr);
4026 dst_hold(&ifp->rt->u.dst);
4027 if (ip6_del_rt(ifp->rt))
4028 dst_free(&ifp->rt->u.dst);
4029 break;
4030 }
4031 }
4032
4033 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4034 {
4035 rcu_read_lock_bh();
4036 if (likely(ifp->idev->dead == 0))
4037 __ipv6_ifa_notify(event, ifp);
4038 rcu_read_unlock_bh();
4039 }
4040
4041 #ifdef CONFIG_SYSCTL
4042
4043 static
4044 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4045 void __user *buffer, size_t *lenp, loff_t *ppos)
4046 {
4047 int *valp = ctl->data;
4048 int val = *valp;
4049 loff_t pos = *ppos;
4050 int ret;
4051
4052 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4053
4054 if (write)
4055 ret = addrconf_fixup_forwarding(ctl, valp, val);
4056 if (ret)
4057 *ppos = pos;
4058 return ret;
4059 }
4060
4061 static void dev_disable_change(struct inet6_dev *idev)
4062 {
4063 if (!idev || !idev->dev)
4064 return;
4065
4066 if (idev->cnf.disable_ipv6)
4067 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4068 else
4069 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4070 }
4071
4072 static void addrconf_disable_change(struct net *net, __s32 newf)
4073 {
4074 struct net_device *dev;
4075 struct inet6_dev *idev;
4076
4077 rcu_read_lock();
4078 for_each_netdev_rcu(net, dev) {
4079 idev = __in6_dev_get(dev);
4080 if (idev) {
4081 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4082 idev->cnf.disable_ipv6 = newf;
4083 if (changed)
4084 dev_disable_change(idev);
4085 }
4086 }
4087 rcu_read_unlock();
4088 }
4089
4090 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4091 {
4092 struct net *net;
4093
4094 net = (struct net *)table->extra2;
4095
4096 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4097 return 0;
4098
4099 if (!rtnl_trylock()) {
4100 /* Restore the original values before restarting */
4101 *p = old;
4102 return restart_syscall();
4103 }
4104
4105 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4106 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4107 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4108 addrconf_disable_change(net, newf);
4109 } else if ((!*p) ^ (!old))
4110 dev_disable_change((struct inet6_dev *)table->extra1);
4111
4112 rtnl_unlock();
4113 return 0;
4114 }
4115
4116 static
4117 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4118 void __user *buffer, size_t *lenp, loff_t *ppos)
4119 {
4120 int *valp = ctl->data;
4121 int val = *valp;
4122 loff_t pos = *ppos;
4123 int ret;
4124
4125 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4126
4127 if (write)
4128 ret = addrconf_disable_ipv6(ctl, valp, val);
4129 if (ret)
4130 *ppos = pos;
4131 return ret;
4132 }
4133
4134 static struct addrconf_sysctl_table
4135 {
4136 struct ctl_table_header *sysctl_header;
4137 ctl_table addrconf_vars[DEVCONF_MAX+1];
4138 char *dev_name;
4139 } addrconf_sysctl __read_mostly = {
4140 .sysctl_header = NULL,
4141 .addrconf_vars = {
4142 {
4143 .procname = "forwarding",
4144 .data = &ipv6_devconf.forwarding,
4145 .maxlen = sizeof(int),
4146 .mode = 0644,
4147 .proc_handler = addrconf_sysctl_forward,
4148 },
4149 {
4150 .procname = "hop_limit",
4151 .data = &ipv6_devconf.hop_limit,
4152 .maxlen = sizeof(int),
4153 .mode = 0644,
4154 .proc_handler = proc_dointvec,
4155 },
4156 {
4157 .procname = "mtu",
4158 .data = &ipv6_devconf.mtu6,
4159 .maxlen = sizeof(int),
4160 .mode = 0644,
4161 .proc_handler = proc_dointvec,
4162 },
4163 {
4164 .procname = "accept_ra",
4165 .data = &ipv6_devconf.accept_ra,
4166 .maxlen = sizeof(int),
4167 .mode = 0644,
4168 .proc_handler = proc_dointvec,
4169 },
4170 {
4171 .procname = "accept_redirects",
4172 .data = &ipv6_devconf.accept_redirects,
4173 .maxlen = sizeof(int),
4174 .mode = 0644,
4175 .proc_handler = proc_dointvec,
4176 },
4177 {
4178 .procname = "autoconf",
4179 .data = &ipv6_devconf.autoconf,
4180 .maxlen = sizeof(int),
4181 .mode = 0644,
4182 .proc_handler = proc_dointvec,
4183 },
4184 {
4185 .procname = "dad_transmits",
4186 .data = &ipv6_devconf.dad_transmits,
4187 .maxlen = sizeof(int),
4188 .mode = 0644,
4189 .proc_handler = proc_dointvec,
4190 },
4191 {
4192 .procname = "router_solicitations",
4193 .data = &ipv6_devconf.rtr_solicits,
4194 .maxlen = sizeof(int),
4195 .mode = 0644,
4196 .proc_handler = proc_dointvec,
4197 },
4198 {
4199 .procname = "router_solicitation_interval",
4200 .data = &ipv6_devconf.rtr_solicit_interval,
4201 .maxlen = sizeof(int),
4202 .mode = 0644,
4203 .proc_handler = proc_dointvec_jiffies,
4204 },
4205 {
4206 .procname = "router_solicitation_delay",
4207 .data = &ipv6_devconf.rtr_solicit_delay,
4208 .maxlen = sizeof(int),
4209 .mode = 0644,
4210 .proc_handler = proc_dointvec_jiffies,
4211 },
4212 {
4213 .procname = "force_mld_version",
4214 .data = &ipv6_devconf.force_mld_version,
4215 .maxlen = sizeof(int),
4216 .mode = 0644,
4217 .proc_handler = proc_dointvec,
4218 },
4219 #ifdef CONFIG_IPV6_PRIVACY
4220 {
4221 .procname = "use_tempaddr",
4222 .data = &ipv6_devconf.use_tempaddr,
4223 .maxlen = sizeof(int),
4224 .mode = 0644,
4225 .proc_handler = proc_dointvec,
4226 },
4227 {
4228 .procname = "temp_valid_lft",
4229 .data = &ipv6_devconf.temp_valid_lft,
4230 .maxlen = sizeof(int),
4231 .mode = 0644,
4232 .proc_handler = proc_dointvec,
4233 },
4234 {
4235 .procname = "temp_prefered_lft",
4236 .data = &ipv6_devconf.temp_prefered_lft,
4237 .maxlen = sizeof(int),
4238 .mode = 0644,
4239 .proc_handler = proc_dointvec,
4240 },
4241 {
4242 .procname = "regen_max_retry",
4243 .data = &ipv6_devconf.regen_max_retry,
4244 .maxlen = sizeof(int),
4245 .mode = 0644,
4246 .proc_handler = proc_dointvec,
4247 },
4248 {
4249 .procname = "max_desync_factor",
4250 .data = &ipv6_devconf.max_desync_factor,
4251 .maxlen = sizeof(int),
4252 .mode = 0644,
4253 .proc_handler = proc_dointvec,
4254 },
4255 #endif
4256 {
4257 .procname = "max_addresses",
4258 .data = &ipv6_devconf.max_addresses,
4259 .maxlen = sizeof(int),
4260 .mode = 0644,
4261 .proc_handler = proc_dointvec,
4262 },
4263 {
4264 .procname = "accept_ra_defrtr",
4265 .data = &ipv6_devconf.accept_ra_defrtr,
4266 .maxlen = sizeof(int),
4267 .mode = 0644,
4268 .proc_handler = proc_dointvec,
4269 },
4270 {
4271 .procname = "accept_ra_pinfo",
4272 .data = &ipv6_devconf.accept_ra_pinfo,
4273 .maxlen = sizeof(int),
4274 .mode = 0644,
4275 .proc_handler = proc_dointvec,
4276 },
4277 #ifdef CONFIG_IPV6_ROUTER_PREF
4278 {
4279 .procname = "accept_ra_rtr_pref",
4280 .data = &ipv6_devconf.accept_ra_rtr_pref,
4281 .maxlen = sizeof(int),
4282 .mode = 0644,
4283 .proc_handler = proc_dointvec,
4284 },
4285 {
4286 .procname = "router_probe_interval",
4287 .data = &ipv6_devconf.rtr_probe_interval,
4288 .maxlen = sizeof(int),
4289 .mode = 0644,
4290 .proc_handler = proc_dointvec_jiffies,
4291 },
4292 #ifdef CONFIG_IPV6_ROUTE_INFO
4293 {
4294 .procname = "accept_ra_rt_info_max_plen",
4295 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4296 .maxlen = sizeof(int),
4297 .mode = 0644,
4298 .proc_handler = proc_dointvec,
4299 },
4300 #endif
4301 #endif
4302 {
4303 .procname = "proxy_ndp",
4304 .data = &ipv6_devconf.proxy_ndp,
4305 .maxlen = sizeof(int),
4306 .mode = 0644,
4307 .proc_handler = proc_dointvec,
4308 },
4309 {
4310 .procname = "accept_source_route",
4311 .data = &ipv6_devconf.accept_source_route,
4312 .maxlen = sizeof(int),
4313 .mode = 0644,
4314 .proc_handler = proc_dointvec,
4315 },
4316 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4317 {
4318 .procname = "optimistic_dad",
4319 .data = &ipv6_devconf.optimistic_dad,
4320 .maxlen = sizeof(int),
4321 .mode = 0644,
4322 .proc_handler = proc_dointvec,
4323
4324 },
4325 #endif
4326 #ifdef CONFIG_IPV6_MROUTE
4327 {
4328 .procname = "mc_forwarding",
4329 .data = &ipv6_devconf.mc_forwarding,
4330 .maxlen = sizeof(int),
4331 .mode = 0444,
4332 .proc_handler = proc_dointvec,
4333 },
4334 #endif
4335 {
4336 .procname = "disable_ipv6",
4337 .data = &ipv6_devconf.disable_ipv6,
4338 .maxlen = sizeof(int),
4339 .mode = 0644,
4340 .proc_handler = addrconf_sysctl_disable,
4341 },
4342 {
4343 .procname = "accept_dad",
4344 .data = &ipv6_devconf.accept_dad,
4345 .maxlen = sizeof(int),
4346 .mode = 0644,
4347 .proc_handler = proc_dointvec,
4348 },
4349 {
4350 .procname = "force_tllao",
4351 .data = &ipv6_devconf.force_tllao,
4352 .maxlen = sizeof(int),
4353 .mode = 0644,
4354 .proc_handler = proc_dointvec
4355 },
4356 {
4357 /* sentinel */
4358 }
4359 },
4360 };
4361
4362 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4363 struct inet6_dev *idev, struct ipv6_devconf *p)
4364 {
4365 int i;
4366 struct addrconf_sysctl_table *t;
4367
4368 #define ADDRCONF_CTL_PATH_DEV 3
4369
4370 struct ctl_path addrconf_ctl_path[] = {
4371 { .procname = "net", },
4372 { .procname = "ipv6", },
4373 { .procname = "conf", },
4374 { /* to be set */ },
4375 { },
4376 };
4377
4378
4379 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4380 if (t == NULL)
4381 goto out;
4382
4383 for (i=0; t->addrconf_vars[i].data; i++) {
4384 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4385 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4386 t->addrconf_vars[i].extra2 = net;
4387 }
4388
4389 /*
4390 * Make a copy of dev_name, because '.procname' is regarded as const
4391 * by sysctl and we wouldn't want anyone to change it under our feet
4392 * (see SIOCSIFNAME).
4393 */
4394 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4395 if (!t->dev_name)
4396 goto free;
4397
4398 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4399
4400 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4401 t->addrconf_vars);
4402 if (t->sysctl_header == NULL)
4403 goto free_procname;
4404
4405 p->sysctl = t;
4406 return 0;
4407
4408 free_procname:
4409 kfree(t->dev_name);
4410 free:
4411 kfree(t);
4412 out:
4413 return -ENOBUFS;
4414 }
4415
4416 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4417 {
4418 struct addrconf_sysctl_table *t;
4419
4420 if (p->sysctl == NULL)
4421 return;
4422
4423 t = p->sysctl;
4424 p->sysctl = NULL;
4425 unregister_sysctl_table(t->sysctl_header);
4426 kfree(t->dev_name);
4427 kfree(t);
4428 }
4429
4430 static void addrconf_sysctl_register(struct inet6_dev *idev)
4431 {
4432 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4433 &ndisc_ifinfo_sysctl_change);
4434 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4435 idev, &idev->cnf);
4436 }
4437
4438 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4439 {
4440 __addrconf_sysctl_unregister(&idev->cnf);
4441 neigh_sysctl_unregister(idev->nd_parms);
4442 }
4443
4444
4445 #endif
4446
4447 static int __net_init addrconf_init_net(struct net *net)
4448 {
4449 int err;
4450 struct ipv6_devconf *all, *dflt;
4451
4452 err = -ENOMEM;
4453 all = &ipv6_devconf;
4454 dflt = &ipv6_devconf_dflt;
4455
4456 if (!net_eq(net, &init_net)) {
4457 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4458 if (all == NULL)
4459 goto err_alloc_all;
4460
4461 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4462 if (dflt == NULL)
4463 goto err_alloc_dflt;
4464 } else {
4465 /* these will be inherited by all namespaces */
4466 dflt->autoconf = ipv6_defaults.autoconf;
4467 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4468 }
4469
4470 net->ipv6.devconf_all = all;
4471 net->ipv6.devconf_dflt = dflt;
4472
4473 #ifdef CONFIG_SYSCTL
4474 err = __addrconf_sysctl_register(net, "all", NULL, all);
4475 if (err < 0)
4476 goto err_reg_all;
4477
4478 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4479 if (err < 0)
4480 goto err_reg_dflt;
4481 #endif
4482 return 0;
4483
4484 #ifdef CONFIG_SYSCTL
4485 err_reg_dflt:
4486 __addrconf_sysctl_unregister(all);
4487 err_reg_all:
4488 kfree(dflt);
4489 #endif
4490 err_alloc_dflt:
4491 kfree(all);
4492 err_alloc_all:
4493 return err;
4494 }
4495
4496 static void __net_exit addrconf_exit_net(struct net *net)
4497 {
4498 #ifdef CONFIG_SYSCTL
4499 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4500 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4501 #endif
4502 if (!net_eq(net, &init_net)) {
4503 kfree(net->ipv6.devconf_dflt);
4504 kfree(net->ipv6.devconf_all);
4505 }
4506 }
4507
4508 static struct pernet_operations addrconf_ops = {
4509 .init = addrconf_init_net,
4510 .exit = addrconf_exit_net,
4511 };
4512
4513 /*
4514 * Device notifier
4515 */
4516
4517 int register_inet6addr_notifier(struct notifier_block *nb)
4518 {
4519 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4520 }
4521
4522 EXPORT_SYMBOL(register_inet6addr_notifier);
4523
4524 int unregister_inet6addr_notifier(struct notifier_block *nb)
4525 {
4526 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4527 }
4528
4529 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4530
4531 /*
4532 * Init / cleanup code
4533 */
4534
4535 int __init addrconf_init(void)
4536 {
4537 int err;
4538
4539 if ((err = ipv6_addr_label_init()) < 0) {
4540 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4541 err);
4542 return err;
4543 }
4544
4545 register_pernet_subsys(&addrconf_ops);
4546
4547 /* The addrconf netdev notifier requires that loopback_dev
4548 * has it's ipv6 private information allocated and setup
4549 * before it can bring up and give link-local addresses
4550 * to other devices which are up.
4551 *
4552 * Unfortunately, loopback_dev is not necessarily the first
4553 * entry in the global dev_base list of net devices. In fact,
4554 * it is likely to be the very last entry on that list.
4555 * So this causes the notifier registry below to try and
4556 * give link-local addresses to all devices besides loopback_dev
4557 * first, then loopback_dev, which cases all the non-loopback_dev
4558 * devices to fail to get a link-local address.
4559 *
4560 * So, as a temporary fix, allocate the ipv6 structure for
4561 * loopback_dev first by hand.
4562 * Longer term, all of the dependencies ipv6 has upon the loopback
4563 * device and it being up should be removed.
4564 */
4565 rtnl_lock();
4566 if (!ipv6_add_dev(init_net.loopback_dev))
4567 err = -ENOMEM;
4568 rtnl_unlock();
4569 if (err)
4570 goto errlo;
4571
4572 register_netdevice_notifier(&ipv6_dev_notf);
4573
4574 addrconf_verify(0);
4575
4576 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4577 if (err < 0)
4578 goto errout;
4579
4580 /* Only the first call to __rtnl_register can fail */
4581 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4582 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4583 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4584 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4585 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4586
4587 ipv6_addr_label_rtnl_register();
4588
4589 return 0;
4590 errout:
4591 unregister_netdevice_notifier(&ipv6_dev_notf);
4592 errlo:
4593 unregister_pernet_subsys(&addrconf_ops);
4594
4595 return err;
4596 }
4597
4598 void addrconf_cleanup(void)
4599 {
4600 struct inet6_ifaddr *ifa;
4601 struct net_device *dev;
4602 int i;
4603
4604 unregister_netdevice_notifier(&ipv6_dev_notf);
4605 unregister_pernet_subsys(&addrconf_ops);
4606
4607 rtnl_lock();
4608
4609 /* clean dev list */
4610 for_each_netdev(&init_net, dev) {
4611 if (__in6_dev_get(dev) == NULL)
4612 continue;
4613 addrconf_ifdown(dev, 1);
4614 }
4615 addrconf_ifdown(init_net.loopback_dev, 2);
4616
4617 /*
4618 * Check hash table.
4619 */
4620 write_lock_bh(&addrconf_hash_lock);
4621 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4622 for (ifa=inet6_addr_lst[i]; ifa; ) {
4623 struct inet6_ifaddr *bifa;
4624
4625 bifa = ifa;
4626 ifa = ifa->lst_next;
4627 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4628 /* Do not free it; something is wrong.
4629 Now we can investigate it with debugger.
4630 */
4631 }
4632 }
4633 write_unlock_bh(&addrconf_hash_lock);
4634
4635 del_timer(&addr_chk_timer);
4636 rtnl_unlock();
4637 }
Linux kernel - Deliverables
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