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pci-acpi: add flag to indicate query had been done
[linux-2.6/mini2440.git] / net / ipv6 / addrconf.c
blob147588f4c7c05e1ef5cafb776931840912d8adba
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 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17 /*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
41 */
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/socket.h>
46 #include <linux/sockios.h>
47 #include <linux/net.h>
48 #include <linux/in6.h>
49 #include <linux/netdevice.h>
50 #include <linux/if_addr.h>
51 #include <linux/if_arp.h>
52 #include <linux/if_arcnet.h>
53 #include <linux/if_infiniband.h>
54 #include <linux/route.h>
55 #include <linux/inetdevice.h>
56 #include <linux/init.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64
65 #include <net/net_namespace.h>
66 #include <net/sock.h>
67 #include <net/snmp.h>
68
69 #include <net/ipv6.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
74 #include <net/tcp.h>
75 #include <net/ip.h>
76 #include <net/netlink.h>
77 #include <net/pkt_sched.h>
78 #include <linux/if_tunnel.h>
79 #include <linux/rtnetlink.h>
80
81 #ifdef CONFIG_IPV6_PRIVACY
82 #include <linux/random.h>
83 #endif
84
85 #include <asm/uaccess.h>
86 #include <asm/unaligned.h>
87
88 #include <linux/proc_fs.h>
89 #include <linux/seq_file.h>
90
91 /* Set to 3 to get tracing... */
92 #define ACONF_DEBUG 2
93
94 #if ACONF_DEBUG >= 3
95 #define ADBG(x) printk x
96 #else
97 #define ADBG(x)
98 #endif
99
100 #define INFINITY_LIFE_TIME 0xFFFFFFFF
101 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102
103 #ifdef CONFIG_SYSCTL
104 static void addrconf_sysctl_register(struct inet6_dev *idev);
105 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
106 #else
107 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
108 {
109 }
110
111 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
112 {
113 }
114 #endif
115
116 #ifdef CONFIG_IPV6_PRIVACY
117 static int __ipv6_regen_rndid(struct inet6_dev *idev);
118 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
119 static void ipv6_regen_rndid(unsigned long data);
120
121 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
122 #endif
123
124 static int ipv6_count_addresses(struct inet6_dev *idev);
125
126 /*
127 * Configured unicast address hash table
128 */
129 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
130 static DEFINE_RWLOCK(addrconf_hash_lock);
131
132 static void addrconf_verify(unsigned long);
133
134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
135 static DEFINE_SPINLOCK(addrconf_verify_lock);
136
137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139
140 static int addrconf_ifdown(struct net_device *dev, int how);
141
142 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
143 static void addrconf_dad_timer(unsigned long data);
144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
145 static void addrconf_dad_run(struct inet6_dev *idev);
146 static void addrconf_rs_timer(unsigned long data);
147 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
149
150 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
151 struct prefix_info *pinfo);
152 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
153 struct net_device *dev);
154
155 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
156
157 struct ipv6_devconf ipv6_devconf __read_mostly = {
158 .forwarding = 0,
159 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
160 .mtu6 = IPV6_MIN_MTU,
161 .accept_ra = 1,
162 .accept_redirects = 1,
163 .autoconf = 1,
164 .force_mld_version = 0,
165 .dad_transmits = 1,
166 .rtr_solicits = MAX_RTR_SOLICITATIONS,
167 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
168 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
169 #ifdef CONFIG_IPV6_PRIVACY
170 .use_tempaddr = 0,
171 .temp_valid_lft = TEMP_VALID_LIFETIME,
172 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
173 .regen_max_retry = REGEN_MAX_RETRY,
174 .max_desync_factor = MAX_DESYNC_FACTOR,
175 #endif
176 .max_addresses = IPV6_MAX_ADDRESSES,
177 .accept_ra_defrtr = 1,
178 .accept_ra_pinfo = 1,
179 #ifdef CONFIG_IPV6_ROUTER_PREF
180 .accept_ra_rtr_pref = 1,
181 .rtr_probe_interval = 60 * HZ,
182 #ifdef CONFIG_IPV6_ROUTE_INFO
183 .accept_ra_rt_info_max_plen = 0,
184 #endif
185 #endif
186 .proxy_ndp = 0,
187 .accept_source_route = 0, /* we do not accept RH0 by default. */
188 };
189
190 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
191 .forwarding = 0,
192 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
193 .mtu6 = IPV6_MIN_MTU,
194 .accept_ra = 1,
195 .accept_redirects = 1,
196 .autoconf = 1,
197 .dad_transmits = 1,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
201 #ifdef CONFIG_IPV6_PRIVACY
202 .use_tempaddr = 0,
203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
207 #endif
208 .max_addresses = IPV6_MAX_ADDRESSES,
209 .accept_ra_defrtr = 1,
210 .accept_ra_pinfo = 1,
211 #ifdef CONFIG_IPV6_ROUTER_PREF
212 .accept_ra_rtr_pref = 1,
213 .rtr_probe_interval = 60 * HZ,
214 #ifdef CONFIG_IPV6_ROUTE_INFO
215 .accept_ra_rt_info_max_plen = 0,
216 #endif
217 #endif
218 .proxy_ndp = 0,
219 .accept_source_route = 0, /* we do not accept RH0 by default. */
220 };
221
222 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
223 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
224 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
225 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
226 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
227
228 /* Check if a valid qdisc is available */
229 static inline int addrconf_qdisc_ok(struct net_device *dev)
230 {
231 return (dev->qdisc != &noop_qdisc);
232 }
233
234 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
235 {
236 if (del_timer(&ifp->timer))
237 __in6_ifa_put(ifp);
238 }
239
240 enum addrconf_timer_t
241 {
242 AC_NONE,
243 AC_DAD,
244 AC_RS,
245 };
246
247 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
248 enum addrconf_timer_t what,
249 unsigned long when)
250 {
251 if (!del_timer(&ifp->timer))
252 in6_ifa_hold(ifp);
253
254 switch (what) {
255 case AC_DAD:
256 ifp->timer.function = addrconf_dad_timer;
257 break;
258 case AC_RS:
259 ifp->timer.function = addrconf_rs_timer;
260 break;
261 default:;
262 }
263 ifp->timer.expires = jiffies + when;
264 add_timer(&ifp->timer);
265 }
266
267 static int snmp6_alloc_dev(struct inet6_dev *idev)
268 {
269 if (snmp_mib_init((void **)idev->stats.ipv6,
270 sizeof(struct ipstats_mib)) < 0)
271 goto err_ip;
272 if (snmp_mib_init((void **)idev->stats.icmpv6,
273 sizeof(struct icmpv6_mib)) < 0)
274 goto err_icmp;
275 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
276 sizeof(struct icmpv6msg_mib)) < 0)
277 goto err_icmpmsg;
278
279 return 0;
280
281 err_icmpmsg:
282 snmp_mib_free((void **)idev->stats.icmpv6);
283 err_icmp:
284 snmp_mib_free((void **)idev->stats.ipv6);
285 err_ip:
286 return -ENOMEM;
287 }
288
289 static void snmp6_free_dev(struct inet6_dev *idev)
290 {
291 snmp_mib_free((void **)idev->stats.icmpv6msg);
292 snmp_mib_free((void **)idev->stats.icmpv6);
293 snmp_mib_free((void **)idev->stats.ipv6);
294 }
295
296 /* Nobody refers to this device, we may destroy it. */
297
298 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
299 {
300 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
301 kfree(idev);
302 }
303
304 void in6_dev_finish_destroy(struct inet6_dev *idev)
305 {
306 struct net_device *dev = idev->dev;
307 BUG_TRAP(idev->addr_list==NULL);
308 BUG_TRAP(idev->mc_list==NULL);
309 #ifdef NET_REFCNT_DEBUG
310 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
311 #endif
312 dev_put(dev);
313 if (!idev->dead) {
314 printk("Freeing alive inet6 device %p\n", idev);
315 return;
316 }
317 snmp6_free_dev(idev);
318 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
319 }
320
321 EXPORT_SYMBOL(in6_dev_finish_destroy);
322
323 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
324 {
325 struct inet6_dev *ndev;
326
327 ASSERT_RTNL();
328
329 if (dev->mtu < IPV6_MIN_MTU)
330 return NULL;
331
332 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
333
334 if (ndev == NULL)
335 return NULL;
336
337 rwlock_init(&ndev->lock);
338 ndev->dev = dev;
339 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
340 ndev->cnf.mtu6 = dev->mtu;
341 ndev->cnf.sysctl = NULL;
342 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
343 if (ndev->nd_parms == NULL) {
344 kfree(ndev);
345 return NULL;
346 }
347 /* We refer to the device */
348 dev_hold(dev);
349
350 if (snmp6_alloc_dev(ndev) < 0) {
351 ADBG((KERN_WARNING
352 "%s(): cannot allocate memory for statistics; dev=%s.\n",
353 __func__, dev->name));
354 neigh_parms_release(&nd_tbl, ndev->nd_parms);
355 ndev->dead = 1;
356 in6_dev_finish_destroy(ndev);
357 return NULL;
358 }
359
360 if (snmp6_register_dev(ndev) < 0) {
361 ADBG((KERN_WARNING
362 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
363 __func__, dev->name));
364 neigh_parms_release(&nd_tbl, ndev->nd_parms);
365 ndev->dead = 1;
366 in6_dev_finish_destroy(ndev);
367 return NULL;
368 }
369
370 /* One reference from device. We must do this before
371 * we invoke __ipv6_regen_rndid().
372 */
373 in6_dev_hold(ndev);
374
375 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
376 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
377 printk(KERN_INFO
378 "%s: Disabled Multicast RS\n",
379 dev->name);
380 ndev->cnf.rtr_solicits = 0;
381 }
382 #endif
383
384 #ifdef CONFIG_IPV6_PRIVACY
385 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
386 if ((dev->flags&IFF_LOOPBACK) ||
387 dev->type == ARPHRD_TUNNEL ||
388 dev->type == ARPHRD_TUNNEL6 ||
389 dev->type == ARPHRD_SIT ||
390 dev->type == ARPHRD_NONE) {
391 printk(KERN_INFO
392 "%s: Disabled Privacy Extensions\n",
393 dev->name);
394 ndev->cnf.use_tempaddr = -1;
395 } else {
396 in6_dev_hold(ndev);
397 ipv6_regen_rndid((unsigned long) ndev);
398 }
399 #endif
400
401 if (netif_running(dev) && addrconf_qdisc_ok(dev))
402 ndev->if_flags |= IF_READY;
403
404 ipv6_mc_init_dev(ndev);
405 ndev->tstamp = jiffies;
406 addrconf_sysctl_register(ndev);
407 /* protected by rtnl_lock */
408 rcu_assign_pointer(dev->ip6_ptr, ndev);
409
410 /* Join all-node multicast group */
411 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
412
413 return ndev;
414 }
415
416 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
417 {
418 struct inet6_dev *idev;
419
420 ASSERT_RTNL();
421
422 if ((idev = __in6_dev_get(dev)) == NULL) {
423 if ((idev = ipv6_add_dev(dev)) == NULL)
424 return NULL;
425 }
426
427 if (dev->flags&IFF_UP)
428 ipv6_mc_up(idev);
429 return idev;
430 }
431
432 #ifdef CONFIG_SYSCTL
433 static void dev_forward_change(struct inet6_dev *idev)
434 {
435 struct net_device *dev;
436 struct inet6_ifaddr *ifa;
437
438 if (!idev)
439 return;
440 dev = idev->dev;
441 if (dev && (dev->flags & IFF_MULTICAST)) {
442 if (idev->cnf.forwarding)
443 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
444 else
445 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
446 }
447 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
448 if (ifa->flags&IFA_F_TENTATIVE)
449 continue;
450 if (idev->cnf.forwarding)
451 addrconf_join_anycast(ifa);
452 else
453 addrconf_leave_anycast(ifa);
454 }
455 }
456
457
458 static void addrconf_forward_change(struct net *net, __s32 newf)
459 {
460 struct net_device *dev;
461 struct inet6_dev *idev;
462
463 read_lock(&dev_base_lock);
464 for_each_netdev(net, dev) {
465 rcu_read_lock();
466 idev = __in6_dev_get(dev);
467 if (idev) {
468 int changed = (!idev->cnf.forwarding) ^ (!newf);
469 idev->cnf.forwarding = newf;
470 if (changed)
471 dev_forward_change(idev);
472 }
473 rcu_read_unlock();
474 }
475 read_unlock(&dev_base_lock);
476 }
477
478 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
479 {
480 struct net *net;
481
482 net = (struct net *)table->extra2;
483 if (p == &net->ipv6.devconf_dflt->forwarding)
484 return;
485
486 if (p == &net->ipv6.devconf_all->forwarding) {
487 __s32 newf = net->ipv6.devconf_all->forwarding;
488 net->ipv6.devconf_dflt->forwarding = newf;
489 addrconf_forward_change(net, newf);
490 } else if ((!*p) ^ (!old))
491 dev_forward_change((struct inet6_dev *)table->extra1);
492
493 if (*p)
494 rt6_purge_dflt_routers(net);
495 }
496 #endif
497
498 /* Nobody refers to this ifaddr, destroy it */
499
500 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
501 {
502 BUG_TRAP(ifp->if_next==NULL);
503 BUG_TRAP(ifp->lst_next==NULL);
504 #ifdef NET_REFCNT_DEBUG
505 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
506 #endif
507
508 in6_dev_put(ifp->idev);
509
510 if (del_timer(&ifp->timer))
511 printk("Timer is still running, when freeing ifa=%p\n", ifp);
512
513 if (!ifp->dead) {
514 printk("Freeing alive inet6 address %p\n", ifp);
515 return;
516 }
517 dst_release(&ifp->rt->u.dst);
518
519 kfree(ifp);
520 }
521
522 static void
523 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
524 {
525 struct inet6_ifaddr *ifa, **ifap;
526 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
527
528 /*
529 * Each device address list is sorted in order of scope -
530 * global before linklocal.
531 */
532 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
533 ifap = &ifa->if_next) {
534 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
535 break;
536 }
537
538 ifp->if_next = *ifap;
539 *ifap = ifp;
540 }
541
542 /*
543 * Hash function taken from net_alias.c
544 */
545 static u8 ipv6_addr_hash(const struct in6_addr *addr)
546 {
547 __u32 word;
548
549 /*
550 * We perform the hash function over the last 64 bits of the address
551 * This will include the IEEE address token on links that support it.
552 */
553
554 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
555 word ^= (word >> 16);
556 word ^= (word >> 8);
557
558 return ((word ^ (word >> 4)) & 0x0f);
559 }
560
561 /* On success it returns ifp with increased reference count */
562
563 static struct inet6_ifaddr *
564 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
565 int scope, u32 flags)
566 {
567 struct inet6_ifaddr *ifa = NULL;
568 struct rt6_info *rt;
569 int hash;
570 int err = 0;
571
572 rcu_read_lock_bh();
573 if (idev->dead) {
574 err = -ENODEV; /*XXX*/
575 goto out2;
576 }
577
578 write_lock(&addrconf_hash_lock);
579
580 /* Ignore adding duplicate addresses on an interface */
581 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
582 ADBG(("ipv6_add_addr: already assigned\n"));
583 err = -EEXIST;
584 goto out;
585 }
586
587 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
588
589 if (ifa == NULL) {
590 ADBG(("ipv6_add_addr: malloc failed\n"));
591 err = -ENOBUFS;
592 goto out;
593 }
594
595 rt = addrconf_dst_alloc(idev, addr, 0);
596 if (IS_ERR(rt)) {
597 err = PTR_ERR(rt);
598 goto out;
599 }
600
601 ipv6_addr_copy(&ifa->addr, addr);
602
603 spin_lock_init(&ifa->lock);
604 init_timer(&ifa->timer);
605 ifa->timer.data = (unsigned long) ifa;
606 ifa->scope = scope;
607 ifa->prefix_len = pfxlen;
608 ifa->flags = flags | IFA_F_TENTATIVE;
609 ifa->cstamp = ifa->tstamp = jiffies;
610
611 ifa->rt = rt;
612
613 /*
614 * part one of RFC 4429, section 3.3
615 * We should not configure an address as
616 * optimistic if we do not yet know the link
617 * layer address of our nexhop router
618 */
619
620 if (rt->rt6i_nexthop == NULL)
621 ifa->flags &= ~IFA_F_OPTIMISTIC;
622
623 ifa->idev = idev;
624 in6_dev_hold(idev);
625 /* For caller */
626 in6_ifa_hold(ifa);
627
628 /* Add to big hash table */
629 hash = ipv6_addr_hash(addr);
630
631 ifa->lst_next = inet6_addr_lst[hash];
632 inet6_addr_lst[hash] = ifa;
633 in6_ifa_hold(ifa);
634 write_unlock(&addrconf_hash_lock);
635
636 write_lock(&idev->lock);
637 /* Add to inet6_dev unicast addr list. */
638 ipv6_link_dev_addr(idev, ifa);
639
640 #ifdef CONFIG_IPV6_PRIVACY
641 if (ifa->flags&IFA_F_TEMPORARY) {
642 ifa->tmp_next = idev->tempaddr_list;
643 idev->tempaddr_list = ifa;
644 in6_ifa_hold(ifa);
645 }
646 #endif
647
648 in6_ifa_hold(ifa);
649 write_unlock(&idev->lock);
650 out2:
651 rcu_read_unlock_bh();
652
653 if (likely(err == 0))
654 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
655 else {
656 kfree(ifa);
657 ifa = ERR_PTR(err);
658 }
659
660 return ifa;
661 out:
662 write_unlock(&addrconf_hash_lock);
663 goto out2;
664 }
665
666 /* This function wants to get referenced ifp and releases it before return */
667
668 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
669 {
670 struct inet6_ifaddr *ifa, **ifap;
671 struct inet6_dev *idev = ifp->idev;
672 int hash;
673 int deleted = 0, onlink = 0;
674 unsigned long expires = jiffies;
675
676 hash = ipv6_addr_hash(&ifp->addr);
677
678 ifp->dead = 1;
679
680 write_lock_bh(&addrconf_hash_lock);
681 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
682 ifap = &ifa->lst_next) {
683 if (ifa == ifp) {
684 *ifap = ifa->lst_next;
685 __in6_ifa_put(ifp);
686 ifa->lst_next = NULL;
687 break;
688 }
689 }
690 write_unlock_bh(&addrconf_hash_lock);
691
692 write_lock_bh(&idev->lock);
693 #ifdef CONFIG_IPV6_PRIVACY
694 if (ifp->flags&IFA_F_TEMPORARY) {
695 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
696 ifap = &ifa->tmp_next) {
697 if (ifa == ifp) {
698 *ifap = ifa->tmp_next;
699 if (ifp->ifpub) {
700 in6_ifa_put(ifp->ifpub);
701 ifp->ifpub = NULL;
702 }
703 __in6_ifa_put(ifp);
704 ifa->tmp_next = NULL;
705 break;
706 }
707 }
708 }
709 #endif
710
711 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
712 if (ifa == ifp) {
713 *ifap = ifa->if_next;
714 __in6_ifa_put(ifp);
715 ifa->if_next = NULL;
716 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
717 break;
718 deleted = 1;
719 continue;
720 } else if (ifp->flags & IFA_F_PERMANENT) {
721 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
722 ifp->prefix_len)) {
723 if (ifa->flags & IFA_F_PERMANENT) {
724 onlink = 1;
725 if (deleted)
726 break;
727 } else {
728 unsigned long lifetime;
729
730 if (!onlink)
731 onlink = -1;
732
733 spin_lock(&ifa->lock);
734
735 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
736 /*
737 * Note: Because this address is
738 * not permanent, lifetime <
739 * LONG_MAX / HZ here.
740 */
741 if (time_before(expires,
742 ifa->tstamp + lifetime * HZ))
743 expires = ifa->tstamp + lifetime * HZ;
744 spin_unlock(&ifa->lock);
745 }
746 }
747 }
748 ifap = &ifa->if_next;
749 }
750 write_unlock_bh(&idev->lock);
751
752 ipv6_ifa_notify(RTM_DELADDR, ifp);
753
754 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
755
756 addrconf_del_timer(ifp);
757
758 /*
759 * Purge or update corresponding prefix
760 *
761 * 1) we don't purge prefix here if address was not permanent.
762 * prefix is managed by its own lifetime.
763 * 2) if there're no addresses, delete prefix.
764 * 3) if there're still other permanent address(es),
765 * corresponding prefix is still permanent.
766 * 4) otherwise, update prefix lifetime to the
767 * longest valid lifetime among the corresponding
768 * addresses on the device.
769 * Note: subsequent RA will update lifetime.
770 *
771 * --yoshfuji
772 */
773 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
774 struct in6_addr prefix;
775 struct rt6_info *rt;
776 struct net *net = dev_net(ifp->idev->dev);
777 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
778 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
779
780 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
781 if (onlink == 0) {
782 ip6_del_rt(rt);
783 rt = NULL;
784 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
785 rt->rt6i_expires = expires;
786 rt->rt6i_flags |= RTF_EXPIRES;
787 }
788 }
789 dst_release(&rt->u.dst);
790 }
791
792 in6_ifa_put(ifp);
793 }
794
795 #ifdef CONFIG_IPV6_PRIVACY
796 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
797 {
798 struct inet6_dev *idev = ifp->idev;
799 struct in6_addr addr, *tmpaddr;
800 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
801 unsigned long regen_advance;
802 int tmp_plen;
803 int ret = 0;
804 int max_addresses;
805 u32 addr_flags;
806
807 write_lock(&idev->lock);
808 if (ift) {
809 spin_lock_bh(&ift->lock);
810 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
811 spin_unlock_bh(&ift->lock);
812 tmpaddr = &addr;
813 } else {
814 tmpaddr = NULL;
815 }
816 retry:
817 in6_dev_hold(idev);
818 if (idev->cnf.use_tempaddr <= 0) {
819 write_unlock(&idev->lock);
820 printk(KERN_INFO
821 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
822 in6_dev_put(idev);
823 ret = -1;
824 goto out;
825 }
826 spin_lock_bh(&ifp->lock);
827 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
828 idev->cnf.use_tempaddr = -1; /*XXX*/
829 spin_unlock_bh(&ifp->lock);
830 write_unlock(&idev->lock);
831 printk(KERN_WARNING
832 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
833 in6_dev_put(idev);
834 ret = -1;
835 goto out;
836 }
837 in6_ifa_hold(ifp);
838 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
839 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
840 spin_unlock_bh(&ifp->lock);
841 write_unlock(&idev->lock);
842 printk(KERN_WARNING
843 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
844 in6_ifa_put(ifp);
845 in6_dev_put(idev);
846 ret = -1;
847 goto out;
848 }
849 memcpy(&addr.s6_addr[8], idev->rndid, 8);
850 tmp_valid_lft = min_t(__u32,
851 ifp->valid_lft,
852 idev->cnf.temp_valid_lft);
853 tmp_prefered_lft = min_t(__u32,
854 ifp->prefered_lft,
855 idev->cnf.temp_prefered_lft - desync_factor / HZ);
856 tmp_plen = ifp->prefix_len;
857 max_addresses = idev->cnf.max_addresses;
858 tmp_cstamp = ifp->cstamp;
859 tmp_tstamp = ifp->tstamp;
860 spin_unlock_bh(&ifp->lock);
861
862 regen_advance = idev->cnf.regen_max_retry *
863 idev->cnf.dad_transmits *
864 idev->nd_parms->retrans_time / HZ;
865 write_unlock(&idev->lock);
866
867 /* A temporary address is created only if this calculated Preferred
868 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
869 * an implementation must not create a temporary address with a zero
870 * Preferred Lifetime.
871 */
872 if (tmp_prefered_lft <= regen_advance) {
873 in6_ifa_put(ifp);
874 in6_dev_put(idev);
875 ret = -1;
876 goto out;
877 }
878
879 addr_flags = IFA_F_TEMPORARY;
880 /* set in addrconf_prefix_rcv() */
881 if (ifp->flags & IFA_F_OPTIMISTIC)
882 addr_flags |= IFA_F_OPTIMISTIC;
883
884 ift = !max_addresses ||
885 ipv6_count_addresses(idev) < max_addresses ?
886 ipv6_add_addr(idev, &addr, tmp_plen,
887 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
888 addr_flags) : NULL;
889 if (!ift || IS_ERR(ift)) {
890 in6_ifa_put(ifp);
891 in6_dev_put(idev);
892 printk(KERN_INFO
893 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
894 tmpaddr = &addr;
895 write_lock(&idev->lock);
896 goto retry;
897 }
898
899 spin_lock_bh(&ift->lock);
900 ift->ifpub = ifp;
901 ift->valid_lft = tmp_valid_lft;
902 ift->prefered_lft = tmp_prefered_lft;
903 ift->cstamp = tmp_cstamp;
904 ift->tstamp = tmp_tstamp;
905 spin_unlock_bh(&ift->lock);
906
907 addrconf_dad_start(ift, 0);
908 in6_ifa_put(ift);
909 in6_dev_put(idev);
910 out:
911 return ret;
912 }
913 #endif
914
915 /*
916 * Choose an appropriate source address (RFC3484)
917 */
918 enum {
919 IPV6_SADDR_RULE_INIT = 0,
920 IPV6_SADDR_RULE_LOCAL,
921 IPV6_SADDR_RULE_SCOPE,
922 IPV6_SADDR_RULE_PREFERRED,
923 #ifdef CONFIG_IPV6_MIP6
924 IPV6_SADDR_RULE_HOA,
925 #endif
926 IPV6_SADDR_RULE_OIF,
927 IPV6_SADDR_RULE_LABEL,
928 #ifdef CONFIG_IPV6_PRIVACY
929 IPV6_SADDR_RULE_PRIVACY,
930 #endif
931 IPV6_SADDR_RULE_ORCHID,
932 IPV6_SADDR_RULE_PREFIX,
933 IPV6_SADDR_RULE_MAX
934 };
935
936 struct ipv6_saddr_score {
937 int rule;
938 int addr_type;
939 struct inet6_ifaddr *ifa;
940 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
941 int scopedist;
942 int matchlen;
943 };
944
945 struct ipv6_saddr_dst {
946 const struct in6_addr *addr;
947 int ifindex;
948 int scope;
949 int label;
950 unsigned int prefs;
951 };
952
953 static inline int ipv6_saddr_preferred(int type)
954 {
955 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
956 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
957 return 1;
958 return 0;
959 }
960
961 static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score,
962 struct ipv6_saddr_dst *dst,
963 int i)
964 {
965 int ret;
966
967 if (i <= score->rule) {
968 switch (i) {
969 case IPV6_SADDR_RULE_SCOPE:
970 ret = score->scopedist;
971 break;
972 case IPV6_SADDR_RULE_PREFIX:
973 ret = score->matchlen;
974 break;
975 default:
976 ret = !!test_bit(i, score->scorebits);
977 }
978 goto out;
979 }
980
981 switch (i) {
982 case IPV6_SADDR_RULE_INIT:
983 /* Rule 0: remember if hiscore is not ready yet */
984 ret = !!score->ifa;
985 break;
986 case IPV6_SADDR_RULE_LOCAL:
987 /* Rule 1: Prefer same address */
988 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
989 break;
990 case IPV6_SADDR_RULE_SCOPE:
991 /* Rule 2: Prefer appropriate scope
992 *
993 * ret
994 * ^
995 * -1 | d 15
996 * ---+--+-+---> scope
997 * |
998 * | d is scope of the destination.
999 * B-d | \
1000 * | \ <- smaller scope is better if
1001 * B-15 | \ if scope is enough for destinaion.
1002 * | ret = B - scope (-1 <= scope >= d <= 15).
1003 * d-C-1 | /
1004 * |/ <- greater is better
1005 * -C / if scope is not enough for destination.
1006 * /| ret = scope - C (-1 <= d < scope <= 15).
1007 *
1008 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1009 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1010 * Assume B = 0 and we get C > 29.
1011 */
1012 ret = __ipv6_addr_src_scope(score->addr_type);
1013 if (ret >= dst->scope)
1014 ret = -ret;
1015 else
1016 ret -= 128; /* 30 is enough */
1017 score->scopedist = ret;
1018 break;
1019 case IPV6_SADDR_RULE_PREFERRED:
1020 /* Rule 3: Avoid deprecated and optimistic addresses */
1021 ret = ipv6_saddr_preferred(score->addr_type) ||
1022 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1023 break;
1024 #ifdef CONFIG_IPV6_MIP6
1025 case IPV6_SADDR_RULE_HOA:
1026 {
1027 /* Rule 4: Prefer home address */
1028 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1029 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1030 break;
1031 }
1032 #endif
1033 case IPV6_SADDR_RULE_OIF:
1034 /* Rule 5: Prefer outgoing interface */
1035 ret = (!dst->ifindex ||
1036 dst->ifindex == score->ifa->idev->dev->ifindex);
1037 break;
1038 case IPV6_SADDR_RULE_LABEL:
1039 /* Rule 6: Prefer matching label */
1040 ret = ipv6_addr_label(&score->ifa->addr, score->addr_type,
1041 score->ifa->idev->dev->ifindex) == dst->label;
1042 break;
1043 #ifdef CONFIG_IPV6_PRIVACY
1044 case IPV6_SADDR_RULE_PRIVACY:
1045 {
1046 /* Rule 7: Prefer public address
1047 * Note: prefer temprary address if use_tempaddr >= 2
1048 */
1049 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1050 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1051 score->ifa->idev->cnf.use_tempaddr >= 2;
1052 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1053 break;
1054 }
1055 #endif
1056 case IPV6_SADDR_RULE_ORCHID:
1057 /* Rule 8-: Prefer ORCHID vs ORCHID or
1058 * non-ORCHID vs non-ORCHID
1059 */
1060 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1061 ipv6_addr_orchid(dst->addr));
1062 break;
1063 case IPV6_SADDR_RULE_PREFIX:
1064 /* Rule 8: Use longest matching prefix */
1065 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1066 dst->addr);
1067 break;
1068 default:
1069 ret = 0;
1070 }
1071
1072 if (ret)
1073 __set_bit(i, score->scorebits);
1074 score->rule = i;
1075 out:
1076 return ret;
1077 }
1078
1079 int ipv6_dev_get_saddr(struct net_device *dst_dev,
1080 const struct in6_addr *daddr, unsigned int prefs,
1081 struct in6_addr *saddr)
1082 {
1083 struct ipv6_saddr_score scores[2],
1084 *score = &scores[0], *hiscore = &scores[1];
1085 struct net *net = dev_net(dst_dev);
1086 struct ipv6_saddr_dst dst;
1087 struct net_device *dev;
1088 int dst_type;
1089
1090 dst_type = __ipv6_addr_type(daddr);
1091 dst.addr = daddr;
1092 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1093 dst.scope = __ipv6_addr_src_scope(dst_type);
1094 dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex);
1095 dst.prefs = prefs;
1096
1097 hiscore->rule = -1;
1098 hiscore->ifa = NULL;
1099
1100 read_lock(&dev_base_lock);
1101 rcu_read_lock();
1102
1103 for_each_netdev(net, dev) {
1104 struct inet6_dev *idev;
1105
1106 /* Candidate Source Address (section 4)
1107 * - multicast and link-local destination address,
1108 * the set of candidate source address MUST only
1109 * include addresses assigned to interfaces
1110 * belonging to the same link as the outgoing
1111 * interface.
1112 * (- For site-local destination addresses, the
1113 * set of candidate source addresses MUST only
1114 * include addresses assigned to interfaces
1115 * belonging to the same site as the outgoing
1116 * interface.)
1117 */
1118 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1119 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1120 dst.ifindex && dev->ifindex != dst.ifindex)
1121 continue;
1122
1123 idev = __in6_dev_get(dev);
1124 if (!idev)
1125 continue;
1126
1127 read_lock_bh(&idev->lock);
1128 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1129 int i;
1130
1131 /*
1132 * - Tentative Address (RFC2462 section 5.4)
1133 * - A tentative address is not considered
1134 * "assigned to an interface" in the traditional
1135 * sense, unless it is also flagged as optimistic.
1136 * - Candidate Source Address (section 4)
1137 * - In any case, anycast addresses, multicast
1138 * addresses, and the unspecified address MUST
1139 * NOT be included in a candidate set.
1140 */
1141 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1142 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1143 continue;
1144
1145 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1146
1147 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1148 score->addr_type & IPV6_ADDR_MULTICAST)) {
1149 LIMIT_NETDEBUG(KERN_DEBUG
1150 "ADDRCONF: unspecified / multicast address "
1151 "assigned as unicast address on %s",
1152 dev->name);
1153 continue;
1154 }
1155
1156 score->rule = -1;
1157 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1158
1159 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1160 int minihiscore, miniscore;
1161
1162 minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i);
1163 miniscore = ipv6_get_saddr_eval(score, &dst, i);
1164
1165 if (minihiscore > miniscore) {
1166 if (i == IPV6_SADDR_RULE_SCOPE &&
1167 score->scopedist > 0) {
1168 /*
1169 * special case:
1170 * each remaining entry
1171 * has too small (not enough)
1172 * scope, because ifa entries
1173 * are sorted by their scope
1174 * values.
1175 */
1176 goto try_nextdev;
1177 }
1178 break;
1179 } else if (minihiscore < miniscore) {
1180 struct ipv6_saddr_score *tmp;
1181
1182 if (hiscore->ifa)
1183 in6_ifa_put(hiscore->ifa);
1184
1185 in6_ifa_hold(score->ifa);
1186
1187 tmp = hiscore;
1188 hiscore = score;
1189 score = tmp;
1190
1191 /* restore our iterator */
1192 score->ifa = hiscore->ifa;
1193
1194 break;
1195 }
1196 }
1197 }
1198 try_nextdev:
1199 read_unlock_bh(&idev->lock);
1200 }
1201 rcu_read_unlock();
1202 read_unlock(&dev_base_lock);
1203
1204 if (!hiscore->ifa)
1205 return -EADDRNOTAVAIL;
1206
1207 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1208 in6_ifa_put(hiscore->ifa);
1209 return 0;
1210 }
1211
1212 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1213
1214 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1215 unsigned char banned_flags)
1216 {
1217 struct inet6_dev *idev;
1218 int err = -EADDRNOTAVAIL;
1219
1220 rcu_read_lock();
1221 if ((idev = __in6_dev_get(dev)) != NULL) {
1222 struct inet6_ifaddr *ifp;
1223
1224 read_lock_bh(&idev->lock);
1225 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1226 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1227 ipv6_addr_copy(addr, &ifp->addr);
1228 err = 0;
1229 break;
1230 }
1231 }
1232 read_unlock_bh(&idev->lock);
1233 }
1234 rcu_read_unlock();
1235 return err;
1236 }
1237
1238 static int ipv6_count_addresses(struct inet6_dev *idev)
1239 {
1240 int cnt = 0;
1241 struct inet6_ifaddr *ifp;
1242
1243 read_lock_bh(&idev->lock);
1244 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1245 cnt++;
1246 read_unlock_bh(&idev->lock);
1247 return cnt;
1248 }
1249
1250 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1251 struct net_device *dev, int strict)
1252 {
1253 struct inet6_ifaddr * ifp;
1254 u8 hash = ipv6_addr_hash(addr);
1255
1256 read_lock_bh(&addrconf_hash_lock);
1257 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1258 if (!net_eq(dev_net(ifp->idev->dev), net))
1259 continue;
1260 if (ipv6_addr_equal(&ifp->addr, addr) &&
1261 !(ifp->flags&IFA_F_TENTATIVE)) {
1262 if (dev == NULL || ifp->idev->dev == dev ||
1263 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1264 break;
1265 }
1266 }
1267 read_unlock_bh(&addrconf_hash_lock);
1268 return ifp != NULL;
1269 }
1270 EXPORT_SYMBOL(ipv6_chk_addr);
1271
1272 static
1273 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1274 struct net_device *dev)
1275 {
1276 struct inet6_ifaddr * ifp;
1277 u8 hash = ipv6_addr_hash(addr);
1278
1279 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1280 if (!net_eq(dev_net(ifp->idev->dev), net))
1281 continue;
1282 if (ipv6_addr_equal(&ifp->addr, addr)) {
1283 if (dev == NULL || ifp->idev->dev == dev)
1284 break;
1285 }
1286 }
1287 return ifp != NULL;
1288 }
1289
1290 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1291 {
1292 struct inet6_dev *idev;
1293 struct inet6_ifaddr *ifa;
1294 int onlink;
1295
1296 onlink = 0;
1297 rcu_read_lock();
1298 idev = __in6_dev_get(dev);
1299 if (idev) {
1300 read_lock_bh(&idev->lock);
1301 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1302 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1303 ifa->prefix_len);
1304 if (onlink)
1305 break;
1306 }
1307 read_unlock_bh(&idev->lock);
1308 }
1309 rcu_read_unlock();
1310 return onlink;
1311 }
1312
1313 EXPORT_SYMBOL(ipv6_chk_prefix);
1314
1315 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1316 struct net_device *dev, int strict)
1317 {
1318 struct inet6_ifaddr * ifp;
1319 u8 hash = ipv6_addr_hash(addr);
1320
1321 read_lock_bh(&addrconf_hash_lock);
1322 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1323 if (!net_eq(dev_net(ifp->idev->dev), net))
1324 continue;
1325 if (ipv6_addr_equal(&ifp->addr, addr)) {
1326 if (dev == NULL || ifp->idev->dev == dev ||
1327 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1328 in6_ifa_hold(ifp);
1329 break;
1330 }
1331 }
1332 }
1333 read_unlock_bh(&addrconf_hash_lock);
1334
1335 return ifp;
1336 }
1337
1338 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1339 {
1340 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1341 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1342 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1343 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1344 int sk_ipv6only = ipv6_only_sock(sk);
1345 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1346 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1347 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1348
1349 if (!sk2_rcv_saddr && !sk_ipv6only)
1350 return 1;
1351
1352 if (addr_type2 == IPV6_ADDR_ANY &&
1353 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1354 return 1;
1355
1356 if (addr_type == IPV6_ADDR_ANY &&
1357 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1358 return 1;
1359
1360 if (sk2_rcv_saddr6 &&
1361 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1362 return 1;
1363
1364 if (addr_type == IPV6_ADDR_MAPPED &&
1365 !sk2_ipv6only &&
1366 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1367 return 1;
1368
1369 return 0;
1370 }
1371
1372 /* Gets referenced address, destroys ifaddr */
1373
1374 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
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 spin_unlock_bh(&ifp->lock);
1381 in6_ifa_put(ifp);
1382 #ifdef CONFIG_IPV6_PRIVACY
1383 } else if (ifp->flags&IFA_F_TEMPORARY) {
1384 struct inet6_ifaddr *ifpub;
1385 spin_lock_bh(&ifp->lock);
1386 ifpub = ifp->ifpub;
1387 if (ifpub) {
1388 in6_ifa_hold(ifpub);
1389 spin_unlock_bh(&ifp->lock);
1390 ipv6_create_tempaddr(ifpub, ifp);
1391 in6_ifa_put(ifpub);
1392 } else {
1393 spin_unlock_bh(&ifp->lock);
1394 }
1395 ipv6_del_addr(ifp);
1396 #endif
1397 } else
1398 ipv6_del_addr(ifp);
1399 }
1400
1401 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1402 {
1403 if (net_ratelimit())
1404 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1405 addrconf_dad_stop(ifp);
1406 }
1407
1408 /* Join to solicited addr multicast group. */
1409
1410 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1411 {
1412 struct in6_addr maddr;
1413
1414 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1415 return;
1416
1417 addrconf_addr_solict_mult(addr, &maddr);
1418 ipv6_dev_mc_inc(dev, &maddr);
1419 }
1420
1421 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1422 {
1423 struct in6_addr maddr;
1424
1425 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1426 return;
1427
1428 addrconf_addr_solict_mult(addr, &maddr);
1429 __ipv6_dev_mc_dec(idev, &maddr);
1430 }
1431
1432 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1433 {
1434 struct in6_addr addr;
1435 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1436 if (ipv6_addr_any(&addr))
1437 return;
1438 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1439 }
1440
1441 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1442 {
1443 struct in6_addr addr;
1444 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1445 if (ipv6_addr_any(&addr))
1446 return;
1447 __ipv6_dev_ac_dec(ifp->idev, &addr);
1448 }
1449
1450 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1451 {
1452 if (dev->addr_len != ETH_ALEN)
1453 return -1;
1454 memcpy(eui, dev->dev_addr, 3);
1455 memcpy(eui + 5, dev->dev_addr + 3, 3);
1456
1457 /*
1458 * The zSeries OSA network cards can be shared among various
1459 * OS instances, but the OSA cards have only one MAC address.
1460 * This leads to duplicate address conflicts in conjunction
1461 * with IPv6 if more than one instance uses the same card.
1462 *
1463 * The driver for these cards can deliver a unique 16-bit
1464 * identifier for each instance sharing the same card. It is
1465 * placed instead of 0xFFFE in the interface identifier. The
1466 * "u" bit of the interface identifier is not inverted in this
1467 * case. Hence the resulting interface identifier has local
1468 * scope according to RFC2373.
1469 */
1470 if (dev->dev_id) {
1471 eui[3] = (dev->dev_id >> 8) & 0xFF;
1472 eui[4] = dev->dev_id & 0xFF;
1473 } else {
1474 eui[3] = 0xFF;
1475 eui[4] = 0xFE;
1476 eui[0] ^= 2;
1477 }
1478 return 0;
1479 }
1480
1481 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1482 {
1483 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1484 if (dev->addr_len != ARCNET_ALEN)
1485 return -1;
1486 memset(eui, 0, 7);
1487 eui[7] = *(u8*)dev->dev_addr;
1488 return 0;
1489 }
1490
1491 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1492 {
1493 if (dev->addr_len != INFINIBAND_ALEN)
1494 return -1;
1495 memcpy(eui, dev->dev_addr + 12, 8);
1496 eui[0] |= 2;
1497 return 0;
1498 }
1499
1500 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1501 {
1502 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1503 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1504 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1505 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1506 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1507 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1508 eui[1] = 0;
1509 eui[2] = 0x5E;
1510 eui[3] = 0xFE;
1511 memcpy(eui + 4, &addr, 4);
1512 return 0;
1513 }
1514 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1515
1516 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1517 {
1518 if (dev->priv_flags & IFF_ISATAP)
1519 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1520 return -1;
1521 }
1522
1523 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1524 {
1525 switch (dev->type) {
1526 case ARPHRD_ETHER:
1527 case ARPHRD_FDDI:
1528 case ARPHRD_IEEE802_TR:
1529 return addrconf_ifid_eui48(eui, dev);
1530 case ARPHRD_ARCNET:
1531 return addrconf_ifid_arcnet(eui, dev);
1532 case ARPHRD_INFINIBAND:
1533 return addrconf_ifid_infiniband(eui, dev);
1534 case ARPHRD_SIT:
1535 return addrconf_ifid_sit(eui, dev);
1536 }
1537 return -1;
1538 }
1539
1540 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1541 {
1542 int err = -1;
1543 struct inet6_ifaddr *ifp;
1544
1545 read_lock_bh(&idev->lock);
1546 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1547 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1548 memcpy(eui, ifp->addr.s6_addr+8, 8);
1549 err = 0;
1550 break;
1551 }
1552 }
1553 read_unlock_bh(&idev->lock);
1554 return err;
1555 }
1556
1557 #ifdef CONFIG_IPV6_PRIVACY
1558 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1559 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1560 {
1561 regen:
1562 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1563 idev->rndid[0] &= ~0x02;
1564
1565 /*
1566 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1567 * check if generated address is not inappropriate
1568 *
1569 * - Reserved subnet anycast (RFC 2526)
1570 * 11111101 11....11 1xxxxxxx
1571 * - ISATAP (RFC4214) 6.1
1572 * 00-00-5E-FE-xx-xx-xx-xx
1573 * - value 0
1574 * - XXX: already assigned to an address on the device
1575 */
1576 if (idev->rndid[0] == 0xfd &&
1577 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1578 (idev->rndid[7]&0x80))
1579 goto regen;
1580 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1581 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1582 goto regen;
1583 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1584 goto regen;
1585 }
1586
1587 return 0;
1588 }
1589
1590 static void ipv6_regen_rndid(unsigned long data)
1591 {
1592 struct inet6_dev *idev = (struct inet6_dev *) data;
1593 unsigned long expires;
1594
1595 rcu_read_lock_bh();
1596 write_lock_bh(&idev->lock);
1597
1598 if (idev->dead)
1599 goto out;
1600
1601 if (__ipv6_regen_rndid(idev) < 0)
1602 goto out;
1603
1604 expires = jiffies +
1605 idev->cnf.temp_prefered_lft * HZ -
1606 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1607 if (time_before(expires, jiffies)) {
1608 printk(KERN_WARNING
1609 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1610 idev->dev->name);
1611 goto out;
1612 }
1613
1614 if (!mod_timer(&idev->regen_timer, expires))
1615 in6_dev_hold(idev);
1616
1617 out:
1618 write_unlock_bh(&idev->lock);
1619 rcu_read_unlock_bh();
1620 in6_dev_put(idev);
1621 }
1622
1623 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1624 int ret = 0;
1625
1626 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1627 ret = __ipv6_regen_rndid(idev);
1628 return ret;
1629 }
1630 #endif
1631
1632 /*
1633 * Add prefix route.
1634 */
1635
1636 static void
1637 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1638 unsigned long expires, u32 flags)
1639 {
1640 struct fib6_config cfg = {
1641 .fc_table = RT6_TABLE_PREFIX,
1642 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1643 .fc_ifindex = dev->ifindex,
1644 .fc_expires = expires,
1645 .fc_dst_len = plen,
1646 .fc_flags = RTF_UP | flags,
1647 .fc_nlinfo.nl_net = dev_net(dev),
1648 };
1649
1650 ipv6_addr_copy(&cfg.fc_dst, pfx);
1651
1652 /* Prevent useless cloning on PtP SIT.
1653 This thing is done here expecting that the whole
1654 class of non-broadcast devices need not cloning.
1655 */
1656 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1657 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1658 cfg.fc_flags |= RTF_NONEXTHOP;
1659 #endif
1660
1661 ip6_route_add(&cfg);
1662 }
1663
1664 /* Create "default" multicast route to the interface */
1665
1666 static void addrconf_add_mroute(struct net_device *dev)
1667 {
1668 struct fib6_config cfg = {
1669 .fc_table = RT6_TABLE_LOCAL,
1670 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1671 .fc_ifindex = dev->ifindex,
1672 .fc_dst_len = 8,
1673 .fc_flags = RTF_UP,
1674 .fc_nlinfo.nl_net = dev_net(dev),
1675 };
1676
1677 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1678
1679 ip6_route_add(&cfg);
1680 }
1681
1682 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1683 static void sit_route_add(struct net_device *dev)
1684 {
1685 struct fib6_config cfg = {
1686 .fc_table = RT6_TABLE_MAIN,
1687 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1688 .fc_ifindex = dev->ifindex,
1689 .fc_dst_len = 96,
1690 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1691 .fc_nlinfo.nl_net = dev_net(dev),
1692 };
1693
1694 /* prefix length - 96 bits "::d.d.d.d" */
1695 ip6_route_add(&cfg);
1696 }
1697 #endif
1698
1699 static void addrconf_add_lroute(struct net_device *dev)
1700 {
1701 struct in6_addr addr;
1702
1703 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1704 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1705 }
1706
1707 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1708 {
1709 struct inet6_dev *idev;
1710
1711 ASSERT_RTNL();
1712
1713 if ((idev = ipv6_find_idev(dev)) == NULL)
1714 return NULL;
1715
1716 /* Add default multicast route */
1717 addrconf_add_mroute(dev);
1718
1719 /* Add link local route */
1720 addrconf_add_lroute(dev);
1721 return idev;
1722 }
1723
1724 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1725 {
1726 struct prefix_info *pinfo;
1727 __u32 valid_lft;
1728 __u32 prefered_lft;
1729 int addr_type;
1730 struct inet6_dev *in6_dev;
1731
1732 pinfo = (struct prefix_info *) opt;
1733
1734 if (len < sizeof(struct prefix_info)) {
1735 ADBG(("addrconf: prefix option too short\n"));
1736 return;
1737 }
1738
1739 /*
1740 * Validation checks ([ADDRCONF], page 19)
1741 */
1742
1743 addr_type = ipv6_addr_type(&pinfo->prefix);
1744
1745 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1746 return;
1747
1748 valid_lft = ntohl(pinfo->valid);
1749 prefered_lft = ntohl(pinfo->prefered);
1750
1751 if (prefered_lft > valid_lft) {
1752 if (net_ratelimit())
1753 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1754 return;
1755 }
1756
1757 in6_dev = in6_dev_get(dev);
1758
1759 if (in6_dev == NULL) {
1760 if (net_ratelimit())
1761 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1762 return;
1763 }
1764
1765 /*
1766 * Two things going on here:
1767 * 1) Add routes for on-link prefixes
1768 * 2) Configure prefixes with the auto flag set
1769 */
1770
1771 if (pinfo->onlink) {
1772 struct rt6_info *rt;
1773 unsigned long rt_expires;
1774
1775 /* Avoid arithmetic overflow. Really, we could
1776 * save rt_expires in seconds, likely valid_lft,
1777 * but it would require division in fib gc, that it
1778 * not good.
1779 */
1780 if (HZ > USER_HZ)
1781 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1782 else
1783 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1784
1785 if (addrconf_finite_timeout(rt_expires))
1786 rt_expires *= HZ;
1787
1788 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
1789 dev->ifindex, 1);
1790
1791 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1792 /* Autoconf prefix route */
1793 if (valid_lft == 0) {
1794 ip6_del_rt(rt);
1795 rt = NULL;
1796 } else if (addrconf_finite_timeout(rt_expires)) {
1797 /* not infinity */
1798 rt->rt6i_expires = jiffies + rt_expires;
1799 rt->rt6i_flags |= RTF_EXPIRES;
1800 } else {
1801 rt->rt6i_flags &= ~RTF_EXPIRES;
1802 rt->rt6i_expires = 0;
1803 }
1804 } else if (valid_lft) {
1805 clock_t expires = 0;
1806 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1807 if (addrconf_finite_timeout(rt_expires)) {
1808 /* not infinity */
1809 flags |= RTF_EXPIRES;
1810 expires = jiffies_to_clock_t(rt_expires);
1811 }
1812 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1813 dev, expires, flags);
1814 }
1815 if (rt)
1816 dst_release(&rt->u.dst);
1817 }
1818
1819 /* Try to figure out our local address for this prefix */
1820
1821 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1822 struct inet6_ifaddr * ifp;
1823 struct in6_addr addr;
1824 int create = 0, update_lft = 0;
1825
1826 if (pinfo->prefix_len == 64) {
1827 memcpy(&addr, &pinfo->prefix, 8);
1828 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1829 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1830 in6_dev_put(in6_dev);
1831 return;
1832 }
1833 goto ok;
1834 }
1835 if (net_ratelimit())
1836 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1837 pinfo->prefix_len);
1838 in6_dev_put(in6_dev);
1839 return;
1840
1841 ok:
1842
1843 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1);
1844
1845 if (ifp == NULL && valid_lft) {
1846 int max_addresses = in6_dev->cnf.max_addresses;
1847 u32 addr_flags = 0;
1848
1849 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1850 if (in6_dev->cnf.optimistic_dad &&
1851 !ipv6_devconf.forwarding)
1852 addr_flags = IFA_F_OPTIMISTIC;
1853 #endif
1854
1855 /* Do not allow to create too much of autoconfigured
1856 * addresses; this would be too easy way to crash kernel.
1857 */
1858 if (!max_addresses ||
1859 ipv6_count_addresses(in6_dev) < max_addresses)
1860 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1861 addr_type&IPV6_ADDR_SCOPE_MASK,
1862 addr_flags);
1863
1864 if (!ifp || IS_ERR(ifp)) {
1865 in6_dev_put(in6_dev);
1866 return;
1867 }
1868
1869 update_lft = create = 1;
1870 ifp->cstamp = jiffies;
1871 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1872 }
1873
1874 if (ifp) {
1875 int flags;
1876 unsigned long now;
1877 #ifdef CONFIG_IPV6_PRIVACY
1878 struct inet6_ifaddr *ift;
1879 #endif
1880 u32 stored_lft;
1881
1882 /* update lifetime (RFC2462 5.5.3 e) */
1883 spin_lock(&ifp->lock);
1884 now = jiffies;
1885 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1886 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1887 else
1888 stored_lft = 0;
1889 if (!update_lft && stored_lft) {
1890 if (valid_lft > MIN_VALID_LIFETIME ||
1891 valid_lft > stored_lft)
1892 update_lft = 1;
1893 else if (stored_lft <= MIN_VALID_LIFETIME) {
1894 /* valid_lft <= stored_lft is always true */
1895 /* XXX: IPsec */
1896 update_lft = 0;
1897 } else {
1898 valid_lft = MIN_VALID_LIFETIME;
1899 if (valid_lft < prefered_lft)
1900 prefered_lft = valid_lft;
1901 update_lft = 1;
1902 }
1903 }
1904
1905 if (update_lft) {
1906 ifp->valid_lft = valid_lft;
1907 ifp->prefered_lft = prefered_lft;
1908 ifp->tstamp = now;
1909 flags = ifp->flags;
1910 ifp->flags &= ~IFA_F_DEPRECATED;
1911 spin_unlock(&ifp->lock);
1912
1913 if (!(flags&IFA_F_TENTATIVE))
1914 ipv6_ifa_notify(0, ifp);
1915 } else
1916 spin_unlock(&ifp->lock);
1917
1918 #ifdef CONFIG_IPV6_PRIVACY
1919 read_lock_bh(&in6_dev->lock);
1920 /* update all temporary addresses in the list */
1921 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1922 /*
1923 * When adjusting the lifetimes of an existing
1924 * temporary address, only lower the lifetimes.
1925 * Implementations must not increase the
1926 * lifetimes of an existing temporary address
1927 * when processing a Prefix Information Option.
1928 */
1929 if (ifp != ift->ifpub)
1930 continue;
1931
1932 spin_lock(&ift->lock);
1933 flags = ift->flags;
1934 if (ift->valid_lft > valid_lft &&
1935 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1936 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1937 if (ift->prefered_lft > prefered_lft &&
1938 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1939 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1940 spin_unlock(&ift->lock);
1941 if (!(flags&IFA_F_TENTATIVE))
1942 ipv6_ifa_notify(0, ift);
1943 }
1944
1945 if (create && in6_dev->cnf.use_tempaddr > 0) {
1946 /*
1947 * When a new public address is created as described in [ADDRCONF],
1948 * also create a new temporary address.
1949 */
1950 read_unlock_bh(&in6_dev->lock);
1951 ipv6_create_tempaddr(ifp, NULL);
1952 } else {
1953 read_unlock_bh(&in6_dev->lock);
1954 }
1955 #endif
1956 in6_ifa_put(ifp);
1957 addrconf_verify(0);
1958 }
1959 }
1960 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1961 in6_dev_put(in6_dev);
1962 }
1963
1964 /*
1965 * Set destination address.
1966 * Special case for SIT interfaces where we create a new "virtual"
1967 * device.
1968 */
1969 int addrconf_set_dstaddr(struct net *net, void __user *arg)
1970 {
1971 struct in6_ifreq ireq;
1972 struct net_device *dev;
1973 int err = -EINVAL;
1974
1975 rtnl_lock();
1976
1977 err = -EFAULT;
1978 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1979 goto err_exit;
1980
1981 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1982
1983 err = -ENODEV;
1984 if (dev == NULL)
1985 goto err_exit;
1986
1987 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1988 if (dev->type == ARPHRD_SIT) {
1989 struct ifreq ifr;
1990 mm_segment_t oldfs;
1991 struct ip_tunnel_parm p;
1992
1993 err = -EADDRNOTAVAIL;
1994 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1995 goto err_exit;
1996
1997 memset(&p, 0, sizeof(p));
1998 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1999 p.iph.saddr = 0;
2000 p.iph.version = 4;
2001 p.iph.ihl = 5;
2002 p.iph.protocol = IPPROTO_IPV6;
2003 p.iph.ttl = 64;
2004 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2005
2006 oldfs = get_fs(); set_fs(KERNEL_DS);
2007 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2008 set_fs(oldfs);
2009
2010 if (err == 0) {
2011 err = -ENOBUFS;
2012 dev = __dev_get_by_name(net, p.name);
2013 if (!dev)
2014 goto err_exit;
2015 err = dev_open(dev);
2016 }
2017 }
2018 #endif
2019
2020 err_exit:
2021 rtnl_unlock();
2022 return err;
2023 }
2024
2025 /*
2026 * Manual configuration of address on an interface
2027 */
2028 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2029 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2030 __u32 valid_lft)
2031 {
2032 struct inet6_ifaddr *ifp;
2033 struct inet6_dev *idev;
2034 struct net_device *dev;
2035 int scope;
2036 u32 flags;
2037 clock_t expires;
2038 unsigned long timeout;
2039
2040 ASSERT_RTNL();
2041
2042 if (plen > 128)
2043 return -EINVAL;
2044
2045 /* check the lifetime */
2046 if (!valid_lft || prefered_lft > valid_lft)
2047 return -EINVAL;
2048
2049 dev = __dev_get_by_index(net, ifindex);
2050 if (!dev)
2051 return -ENODEV;
2052
2053 if ((idev = addrconf_add_dev(dev)) == NULL)
2054 return -ENOBUFS;
2055
2056 scope = ipv6_addr_scope(pfx);
2057
2058 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2059 if (addrconf_finite_timeout(timeout)) {
2060 expires = jiffies_to_clock_t(timeout * HZ);
2061 valid_lft = timeout;
2062 flags = RTF_EXPIRES;
2063 } else {
2064 expires = 0;
2065 flags = 0;
2066 ifa_flags |= IFA_F_PERMANENT;
2067 }
2068
2069 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2070 if (addrconf_finite_timeout(timeout)) {
2071 if (timeout == 0)
2072 ifa_flags |= IFA_F_DEPRECATED;
2073 prefered_lft = timeout;
2074 }
2075
2076 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2077
2078 if (!IS_ERR(ifp)) {
2079 spin_lock_bh(&ifp->lock);
2080 ifp->valid_lft = valid_lft;
2081 ifp->prefered_lft = prefered_lft;
2082 ifp->tstamp = jiffies;
2083 spin_unlock_bh(&ifp->lock);
2084
2085 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2086 expires, flags);
2087 /*
2088 * Note that section 3.1 of RFC 4429 indicates
2089 * that the Optimistic flag should not be set for
2090 * manually configured addresses
2091 */
2092 addrconf_dad_start(ifp, 0);
2093 in6_ifa_put(ifp);
2094 addrconf_verify(0);
2095 return 0;
2096 }
2097
2098 return PTR_ERR(ifp);
2099 }
2100
2101 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2102 unsigned int plen)
2103 {
2104 struct inet6_ifaddr *ifp;
2105 struct inet6_dev *idev;
2106 struct net_device *dev;
2107
2108 if (plen > 128)
2109 return -EINVAL;
2110
2111 dev = __dev_get_by_index(net, ifindex);
2112 if (!dev)
2113 return -ENODEV;
2114
2115 if ((idev = __in6_dev_get(dev)) == NULL)
2116 return -ENXIO;
2117
2118 read_lock_bh(&idev->lock);
2119 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2120 if (ifp->prefix_len == plen &&
2121 ipv6_addr_equal(pfx, &ifp->addr)) {
2122 in6_ifa_hold(ifp);
2123 read_unlock_bh(&idev->lock);
2124
2125 ipv6_del_addr(ifp);
2126
2127 /* If the last address is deleted administratively,
2128 disable IPv6 on this interface.
2129 */
2130 if (idev->addr_list == NULL)
2131 addrconf_ifdown(idev->dev, 1);
2132 return 0;
2133 }
2134 }
2135 read_unlock_bh(&idev->lock);
2136 return -EADDRNOTAVAIL;
2137 }
2138
2139
2140 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2141 {
2142 struct in6_ifreq ireq;
2143 int err;
2144
2145 if (!capable(CAP_NET_ADMIN))
2146 return -EPERM;
2147
2148 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2149 return -EFAULT;
2150
2151 rtnl_lock();
2152 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2153 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2154 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2155 rtnl_unlock();
2156 return err;
2157 }
2158
2159 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2160 {
2161 struct in6_ifreq ireq;
2162 int err;
2163
2164 if (!capable(CAP_NET_ADMIN))
2165 return -EPERM;
2166
2167 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2168 return -EFAULT;
2169
2170 rtnl_lock();
2171 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2172 ireq.ifr6_prefixlen);
2173 rtnl_unlock();
2174 return err;
2175 }
2176
2177 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2178 static void sit_add_v4_addrs(struct inet6_dev *idev)
2179 {
2180 struct inet6_ifaddr * ifp;
2181 struct in6_addr addr;
2182 struct net_device *dev;
2183 struct net *net = dev_net(idev->dev);
2184 int scope;
2185
2186 ASSERT_RTNL();
2187
2188 memset(&addr, 0, sizeof(struct in6_addr));
2189 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2190
2191 if (idev->dev->flags&IFF_POINTOPOINT) {
2192 addr.s6_addr32[0] = htonl(0xfe800000);
2193 scope = IFA_LINK;
2194 } else {
2195 scope = IPV6_ADDR_COMPATv4;
2196 }
2197
2198 if (addr.s6_addr32[3]) {
2199 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2200 if (!IS_ERR(ifp)) {
2201 spin_lock_bh(&ifp->lock);
2202 ifp->flags &= ~IFA_F_TENTATIVE;
2203 spin_unlock_bh(&ifp->lock);
2204 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2205 in6_ifa_put(ifp);
2206 }
2207 return;
2208 }
2209
2210 for_each_netdev(net, dev) {
2211 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2212 if (in_dev && (dev->flags & IFF_UP)) {
2213 struct in_ifaddr * ifa;
2214
2215 int flag = scope;
2216
2217 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2218 int plen;
2219
2220 addr.s6_addr32[3] = ifa->ifa_local;
2221
2222 if (ifa->ifa_scope == RT_SCOPE_LINK)
2223 continue;
2224 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2225 if (idev->dev->flags&IFF_POINTOPOINT)
2226 continue;
2227 flag |= IFA_HOST;
2228 }
2229 if (idev->dev->flags&IFF_POINTOPOINT)
2230 plen = 64;
2231 else
2232 plen = 96;
2233
2234 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2235 IFA_F_PERMANENT);
2236 if (!IS_ERR(ifp)) {
2237 spin_lock_bh(&ifp->lock);
2238 ifp->flags &= ~IFA_F_TENTATIVE;
2239 spin_unlock_bh(&ifp->lock);
2240 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2241 in6_ifa_put(ifp);
2242 }
2243 }
2244 }
2245 }
2246 }
2247 #endif
2248
2249 static void init_loopback(struct net_device *dev)
2250 {
2251 struct inet6_dev *idev;
2252 struct inet6_ifaddr * ifp;
2253
2254 /* ::1 */
2255
2256 ASSERT_RTNL();
2257
2258 if ((idev = ipv6_find_idev(dev)) == NULL) {
2259 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2260 return;
2261 }
2262
2263 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2264 if (!IS_ERR(ifp)) {
2265 spin_lock_bh(&ifp->lock);
2266 ifp->flags &= ~IFA_F_TENTATIVE;
2267 spin_unlock_bh(&ifp->lock);
2268 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2269 in6_ifa_put(ifp);
2270 }
2271 }
2272
2273 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2274 {
2275 struct inet6_ifaddr * ifp;
2276 u32 addr_flags = IFA_F_PERMANENT;
2277
2278 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2279 if (idev->cnf.optimistic_dad &&
2280 !ipv6_devconf.forwarding)
2281 addr_flags |= IFA_F_OPTIMISTIC;
2282 #endif
2283
2284
2285 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2286 if (!IS_ERR(ifp)) {
2287 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2288 addrconf_dad_start(ifp, 0);
2289 in6_ifa_put(ifp);
2290 }
2291 }
2292
2293 static void addrconf_dev_config(struct net_device *dev)
2294 {
2295 struct in6_addr addr;
2296 struct inet6_dev * idev;
2297
2298 ASSERT_RTNL();
2299
2300 if ((dev->type != ARPHRD_ETHER) &&
2301 (dev->type != ARPHRD_FDDI) &&
2302 (dev->type != ARPHRD_IEEE802_TR) &&
2303 (dev->type != ARPHRD_ARCNET) &&
2304 (dev->type != ARPHRD_INFINIBAND)) {
2305 /* Alas, we support only Ethernet autoconfiguration. */
2306 return;
2307 }
2308
2309 idev = addrconf_add_dev(dev);
2310 if (idev == NULL)
2311 return;
2312
2313 memset(&addr, 0, sizeof(struct in6_addr));
2314 addr.s6_addr32[0] = htonl(0xFE800000);
2315
2316 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2317 addrconf_add_linklocal(idev, &addr);
2318 }
2319
2320 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2321 static void addrconf_sit_config(struct net_device *dev)
2322 {
2323 struct inet6_dev *idev;
2324
2325 ASSERT_RTNL();
2326
2327 /*
2328 * Configure the tunnel with one of our IPv4
2329 * addresses... we should configure all of
2330 * our v4 addrs in the tunnel
2331 */
2332
2333 if ((idev = ipv6_find_idev(dev)) == NULL) {
2334 printk(KERN_DEBUG "init sit: add_dev failed\n");
2335 return;
2336 }
2337
2338 if (dev->priv_flags & IFF_ISATAP) {
2339 struct in6_addr addr;
2340
2341 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2342 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2343 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2344 addrconf_add_linklocal(idev, &addr);
2345 return;
2346 }
2347
2348 sit_add_v4_addrs(idev);
2349
2350 if (dev->flags&IFF_POINTOPOINT) {
2351 addrconf_add_mroute(dev);
2352 addrconf_add_lroute(dev);
2353 } else
2354 sit_route_add(dev);
2355 }
2356 #endif
2357
2358 static inline int
2359 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2360 {
2361 struct in6_addr lladdr;
2362
2363 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2364 addrconf_add_linklocal(idev, &lladdr);
2365 return 0;
2366 }
2367 return -1;
2368 }
2369
2370 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2371 {
2372 struct net_device *link_dev;
2373 struct net *net = dev_net(idev->dev);
2374
2375 /* first try to inherit the link-local address from the link device */
2376 if (idev->dev->iflink &&
2377 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2378 if (!ipv6_inherit_linklocal(idev, link_dev))
2379 return;
2380 }
2381 /* then try to inherit it from any device */
2382 for_each_netdev(net, link_dev) {
2383 if (!ipv6_inherit_linklocal(idev, link_dev))
2384 return;
2385 }
2386 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2387 }
2388
2389 /*
2390 * Autoconfigure tunnel with a link-local address so routing protocols,
2391 * DHCPv6, MLD etc. can be run over the virtual link
2392 */
2393
2394 static void addrconf_ip6_tnl_config(struct net_device *dev)
2395 {
2396 struct inet6_dev *idev;
2397
2398 ASSERT_RTNL();
2399
2400 if ((idev = addrconf_add_dev(dev)) == NULL) {
2401 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2402 return;
2403 }
2404 ip6_tnl_add_linklocal(idev);
2405 }
2406
2407 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2408 void * data)
2409 {
2410 struct net_device *dev = (struct net_device *) data;
2411 struct inet6_dev *idev = __in6_dev_get(dev);
2412 int run_pending = 0;
2413 int err;
2414
2415 switch(event) {
2416 case NETDEV_REGISTER:
2417 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2418 idev = ipv6_add_dev(dev);
2419 if (!idev)
2420 return notifier_from_errno(-ENOMEM);
2421 }
2422 break;
2423 case NETDEV_UP:
2424 case NETDEV_CHANGE:
2425 if (dev->flags & IFF_SLAVE)
2426 break;
2427
2428 if (event == NETDEV_UP) {
2429 if (!addrconf_qdisc_ok(dev)) {
2430 /* device is not ready yet. */
2431 printk(KERN_INFO
2432 "ADDRCONF(NETDEV_UP): %s: "
2433 "link is not ready\n",
2434 dev->name);
2435 break;
2436 }
2437
2438 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2439 idev = ipv6_add_dev(dev);
2440
2441 if (idev)
2442 idev->if_flags |= IF_READY;
2443 } else {
2444 if (!addrconf_qdisc_ok(dev)) {
2445 /* device is still not ready. */
2446 break;
2447 }
2448
2449 if (idev) {
2450 if (idev->if_flags & IF_READY) {
2451 /* device is already configured. */
2452 break;
2453 }
2454 idev->if_flags |= IF_READY;
2455 }
2456
2457 printk(KERN_INFO
2458 "ADDRCONF(NETDEV_CHANGE): %s: "
2459 "link becomes ready\n",
2460 dev->name);
2461
2462 run_pending = 1;
2463 }
2464
2465 switch(dev->type) {
2466 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2467 case ARPHRD_SIT:
2468 addrconf_sit_config(dev);
2469 break;
2470 #endif
2471 case ARPHRD_TUNNEL6:
2472 addrconf_ip6_tnl_config(dev);
2473 break;
2474 case ARPHRD_LOOPBACK:
2475 init_loopback(dev);
2476 break;
2477
2478 default:
2479 addrconf_dev_config(dev);
2480 break;
2481 }
2482 if (idev) {
2483 if (run_pending)
2484 addrconf_dad_run(idev);
2485
2486 /* If the MTU changed during the interface down, when the
2487 interface up, the changed MTU must be reflected in the
2488 idev as well as routers.
2489 */
2490 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2491 rt6_mtu_change(dev, dev->mtu);
2492 idev->cnf.mtu6 = dev->mtu;
2493 }
2494 idev->tstamp = jiffies;
2495 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2496 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2497 stop IPv6 on this interface.
2498 */
2499 if (dev->mtu < IPV6_MIN_MTU)
2500 addrconf_ifdown(dev, event != NETDEV_DOWN);
2501 }
2502 break;
2503
2504 case NETDEV_CHANGEMTU:
2505 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2506 rt6_mtu_change(dev, dev->mtu);
2507 idev->cnf.mtu6 = dev->mtu;
2508 break;
2509 }
2510
2511 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2512 idev = ipv6_add_dev(dev);
2513 if (idev)
2514 break;
2515 }
2516
2517 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2518
2519 case NETDEV_DOWN:
2520 case NETDEV_UNREGISTER:
2521 /*
2522 * Remove all addresses from this interface.
2523 */
2524 addrconf_ifdown(dev, event != NETDEV_DOWN);
2525 break;
2526
2527 case NETDEV_CHANGENAME:
2528 if (idev) {
2529 snmp6_unregister_dev(idev);
2530 addrconf_sysctl_unregister(idev);
2531 addrconf_sysctl_register(idev);
2532 err = snmp6_register_dev(idev);
2533 if (err)
2534 return notifier_from_errno(err);
2535 }
2536 break;
2537 }
2538
2539 return NOTIFY_OK;
2540 }
2541
2542 /*
2543 * addrconf module should be notified of a device going up
2544 */
2545 static struct notifier_block ipv6_dev_notf = {
2546 .notifier_call = addrconf_notify,
2547 .priority = 0
2548 };
2549
2550 static int addrconf_ifdown(struct net_device *dev, int how)
2551 {
2552 struct inet6_dev *idev;
2553 struct inet6_ifaddr *ifa, **bifa;
2554 struct net *net = dev_net(dev);
2555 int i;
2556
2557 ASSERT_RTNL();
2558
2559 if ((dev->flags & IFF_LOOPBACK) && how == 1)
2560 how = 0;
2561
2562 rt6_ifdown(net, dev);
2563 neigh_ifdown(&nd_tbl, dev);
2564
2565 idev = __in6_dev_get(dev);
2566 if (idev == NULL)
2567 return -ENODEV;
2568
2569 /* Step 1: remove reference to ipv6 device from parent device.
2570 Do not dev_put!
2571 */
2572 if (how) {
2573 idev->dead = 1;
2574
2575 /* protected by rtnl_lock */
2576 rcu_assign_pointer(dev->ip6_ptr, NULL);
2577
2578 /* Step 1.5: remove snmp6 entry */
2579 snmp6_unregister_dev(idev);
2580
2581 }
2582
2583 /* Step 2: clear hash table */
2584 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2585 bifa = &inet6_addr_lst[i];
2586
2587 write_lock_bh(&addrconf_hash_lock);
2588 while ((ifa = *bifa) != NULL) {
2589 if (ifa->idev == idev) {
2590 *bifa = ifa->lst_next;
2591 ifa->lst_next = NULL;
2592 addrconf_del_timer(ifa);
2593 in6_ifa_put(ifa);
2594 continue;
2595 }
2596 bifa = &ifa->lst_next;
2597 }
2598 write_unlock_bh(&addrconf_hash_lock);
2599 }
2600
2601 write_lock_bh(&idev->lock);
2602
2603 /* Step 3: clear flags for stateless addrconf */
2604 if (!how)
2605 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2606
2607 /* Step 4: clear address list */
2608 #ifdef CONFIG_IPV6_PRIVACY
2609 if (how && del_timer(&idev->regen_timer))
2610 in6_dev_put(idev);
2611
2612 /* clear tempaddr list */
2613 while ((ifa = idev->tempaddr_list) != NULL) {
2614 idev->tempaddr_list = ifa->tmp_next;
2615 ifa->tmp_next = NULL;
2616 ifa->dead = 1;
2617 write_unlock_bh(&idev->lock);
2618 spin_lock_bh(&ifa->lock);
2619
2620 if (ifa->ifpub) {
2621 in6_ifa_put(ifa->ifpub);
2622 ifa->ifpub = NULL;
2623 }
2624 spin_unlock_bh(&ifa->lock);
2625 in6_ifa_put(ifa);
2626 write_lock_bh(&idev->lock);
2627 }
2628 #endif
2629 while ((ifa = idev->addr_list) != NULL) {
2630 idev->addr_list = ifa->if_next;
2631 ifa->if_next = NULL;
2632 ifa->dead = 1;
2633 addrconf_del_timer(ifa);
2634 write_unlock_bh(&idev->lock);
2635
2636 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2637 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2638 in6_ifa_put(ifa);
2639
2640 write_lock_bh(&idev->lock);
2641 }
2642 write_unlock_bh(&idev->lock);
2643
2644 /* Step 5: Discard multicast list */
2645
2646 if (how)
2647 ipv6_mc_destroy_dev(idev);
2648 else
2649 ipv6_mc_down(idev);
2650
2651 idev->tstamp = jiffies;
2652
2653 /* Shot the device (if unregistered) */
2654
2655 if (how) {
2656 addrconf_sysctl_unregister(idev);
2657 neigh_parms_release(&nd_tbl, idev->nd_parms);
2658 neigh_ifdown(&nd_tbl, dev);
2659 in6_dev_put(idev);
2660 }
2661 return 0;
2662 }
2663
2664 static void addrconf_rs_timer(unsigned long data)
2665 {
2666 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2667
2668 if (ifp->idev->cnf.forwarding)
2669 goto out;
2670
2671 if (ifp->idev->if_flags & IF_RA_RCVD) {
2672 /*
2673 * Announcement received after solicitation
2674 * was sent
2675 */
2676 goto out;
2677 }
2678
2679 spin_lock(&ifp->lock);
2680 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2681 /* The wait after the last probe can be shorter */
2682 addrconf_mod_timer(ifp, AC_RS,
2683 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2684 ifp->idev->cnf.rtr_solicit_delay :
2685 ifp->idev->cnf.rtr_solicit_interval);
2686 spin_unlock(&ifp->lock);
2687
2688 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2689 } else {
2690 spin_unlock(&ifp->lock);
2691 /*
2692 * Note: we do not support deprecated "all on-link"
2693 * assumption any longer.
2694 */
2695 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2696 ifp->idev->dev->name);
2697 }
2698
2699 out:
2700 in6_ifa_put(ifp);
2701 }
2702
2703 /*
2704 * Duplicate Address Detection
2705 */
2706 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2707 {
2708 unsigned long rand_num;
2709 struct inet6_dev *idev = ifp->idev;
2710
2711 if (ifp->flags & IFA_F_OPTIMISTIC)
2712 rand_num = 0;
2713 else
2714 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2715
2716 ifp->probes = idev->cnf.dad_transmits;
2717 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2718 }
2719
2720 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2721 {
2722 struct inet6_dev *idev = ifp->idev;
2723 struct net_device *dev = idev->dev;
2724
2725 addrconf_join_solict(dev, &ifp->addr);
2726
2727 net_srandom(ifp->addr.s6_addr32[3]);
2728
2729 read_lock_bh(&idev->lock);
2730 if (ifp->dead)
2731 goto out;
2732 spin_lock_bh(&ifp->lock);
2733
2734 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2735 !(ifp->flags&IFA_F_TENTATIVE) ||
2736 ifp->flags & IFA_F_NODAD) {
2737 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2738 spin_unlock_bh(&ifp->lock);
2739 read_unlock_bh(&idev->lock);
2740
2741 addrconf_dad_completed(ifp);
2742 return;
2743 }
2744
2745 if (!(idev->if_flags & IF_READY)) {
2746 spin_unlock_bh(&ifp->lock);
2747 read_unlock_bh(&idev->lock);
2748 /*
2749 * If the defice is not ready:
2750 * - keep it tentative if it is a permanent address.
2751 * - otherwise, kill it.
2752 */
2753 in6_ifa_hold(ifp);
2754 addrconf_dad_stop(ifp);
2755 return;
2756 }
2757
2758 /*
2759 * Optimistic nodes can start receiving
2760 * Frames right away
2761 */
2762 if(ifp->flags & IFA_F_OPTIMISTIC)
2763 ip6_ins_rt(ifp->rt);
2764
2765 addrconf_dad_kick(ifp);
2766 spin_unlock_bh(&ifp->lock);
2767 out:
2768 read_unlock_bh(&idev->lock);
2769 }
2770
2771 static void addrconf_dad_timer(unsigned long data)
2772 {
2773 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2774 struct inet6_dev *idev = ifp->idev;
2775 struct in6_addr mcaddr;
2776
2777 read_lock_bh(&idev->lock);
2778 if (idev->dead) {
2779 read_unlock_bh(&idev->lock);
2780 goto out;
2781 }
2782 spin_lock_bh(&ifp->lock);
2783 if (ifp->probes == 0) {
2784 /*
2785 * DAD was successful
2786 */
2787
2788 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2789 spin_unlock_bh(&ifp->lock);
2790 read_unlock_bh(&idev->lock);
2791
2792 addrconf_dad_completed(ifp);
2793
2794 goto out;
2795 }
2796
2797 ifp->probes--;
2798 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2799 spin_unlock_bh(&ifp->lock);
2800 read_unlock_bh(&idev->lock);
2801
2802 /* send a neighbour solicitation for our addr */
2803 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2804 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2805 out:
2806 in6_ifa_put(ifp);
2807 }
2808
2809 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2810 {
2811 struct net_device * dev = ifp->idev->dev;
2812
2813 /*
2814 * Configure the address for reception. Now it is valid.
2815 */
2816
2817 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2818
2819 /* If added prefix is link local and forwarding is off,
2820 start sending router solicitations.
2821 */
2822
2823 if (ifp->idev->cnf.forwarding == 0 &&
2824 ifp->idev->cnf.rtr_solicits > 0 &&
2825 (dev->flags&IFF_LOOPBACK) == 0 &&
2826 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2827 /*
2828 * If a host as already performed a random delay
2829 * [...] as part of DAD [...] there is no need
2830 * to delay again before sending the first RS
2831 */
2832 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2833
2834 spin_lock_bh(&ifp->lock);
2835 ifp->probes = 1;
2836 ifp->idev->if_flags |= IF_RS_SENT;
2837 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2838 spin_unlock_bh(&ifp->lock);
2839 }
2840 }
2841
2842 static void addrconf_dad_run(struct inet6_dev *idev) {
2843 struct inet6_ifaddr *ifp;
2844
2845 read_lock_bh(&idev->lock);
2846 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2847 spin_lock_bh(&ifp->lock);
2848 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2849 spin_unlock_bh(&ifp->lock);
2850 continue;
2851 }
2852 spin_unlock_bh(&ifp->lock);
2853 addrconf_dad_kick(ifp);
2854 }
2855 read_unlock_bh(&idev->lock);
2856 }
2857
2858 #ifdef CONFIG_PROC_FS
2859 struct if6_iter_state {
2860 struct seq_net_private p;
2861 int bucket;
2862 };
2863
2864 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2865 {
2866 struct inet6_ifaddr *ifa = NULL;
2867 struct if6_iter_state *state = seq->private;
2868 struct net *net = seq_file_net(seq);
2869
2870 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2871 ifa = inet6_addr_lst[state->bucket];
2872
2873 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2874 ifa = ifa->lst_next;
2875 if (ifa)
2876 break;
2877 }
2878 return ifa;
2879 }
2880
2881 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2882 {
2883 struct if6_iter_state *state = seq->private;
2884 struct net *net = seq_file_net(seq);
2885
2886 ifa = ifa->lst_next;
2887 try_again:
2888 if (ifa) {
2889 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2890 ifa = ifa->lst_next;
2891 goto try_again;
2892 }
2893 }
2894
2895 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2896 ifa = inet6_addr_lst[state->bucket];
2897 goto try_again;
2898 }
2899
2900 return ifa;
2901 }
2902
2903 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2904 {
2905 struct inet6_ifaddr *ifa = if6_get_first(seq);
2906
2907 if (ifa)
2908 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2909 --pos;
2910 return pos ? NULL : ifa;
2911 }
2912
2913 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2914 __acquires(addrconf_hash_lock)
2915 {
2916 read_lock_bh(&addrconf_hash_lock);
2917 return if6_get_idx(seq, *pos);
2918 }
2919
2920 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2921 {
2922 struct inet6_ifaddr *ifa;
2923
2924 ifa = if6_get_next(seq, v);
2925 ++*pos;
2926 return ifa;
2927 }
2928
2929 static void if6_seq_stop(struct seq_file *seq, void *v)
2930 __releases(addrconf_hash_lock)
2931 {
2932 read_unlock_bh(&addrconf_hash_lock);
2933 }
2934
2935 static int if6_seq_show(struct seq_file *seq, void *v)
2936 {
2937 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2938 seq_printf(seq,
2939 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2940 NIP6(ifp->addr),
2941 ifp->idev->dev->ifindex,
2942 ifp->prefix_len,
2943 ifp->scope,
2944 ifp->flags,
2945 ifp->idev->dev->name);
2946 return 0;
2947 }
2948
2949 static const struct seq_operations if6_seq_ops = {
2950 .start = if6_seq_start,
2951 .next = if6_seq_next,
2952 .show = if6_seq_show,
2953 .stop = if6_seq_stop,
2954 };
2955
2956 static int if6_seq_open(struct inode *inode, struct file *file)
2957 {
2958 return seq_open_net(inode, file, &if6_seq_ops,
2959 sizeof(struct if6_iter_state));
2960 }
2961
2962 static const struct file_operations if6_fops = {
2963 .owner = THIS_MODULE,
2964 .open = if6_seq_open,
2965 .read = seq_read,
2966 .llseek = seq_lseek,
2967 .release = seq_release_net,
2968 };
2969
2970 static int if6_proc_net_init(struct net *net)
2971 {
2972 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2973 return -ENOMEM;
2974 return 0;
2975 }
2976
2977 static void if6_proc_net_exit(struct net *net)
2978 {
2979 proc_net_remove(net, "if_inet6");
2980 }
2981
2982 static struct pernet_operations if6_proc_net_ops = {
2983 .init = if6_proc_net_init,
2984 .exit = if6_proc_net_exit,
2985 };
2986
2987 int __init if6_proc_init(void)
2988 {
2989 return register_pernet_subsys(&if6_proc_net_ops);
2990 }
2991
2992 void if6_proc_exit(void)
2993 {
2994 unregister_pernet_subsys(&if6_proc_net_ops);
2995 }
2996 #endif /* CONFIG_PROC_FS */
2997
2998 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2999 /* Check if address is a home address configured on any interface. */
3000 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3001 {
3002 int ret = 0;
3003 struct inet6_ifaddr * ifp;
3004 u8 hash = ipv6_addr_hash(addr);
3005 read_lock_bh(&addrconf_hash_lock);
3006 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3007 if (!net_eq(dev_net(ifp->idev->dev), net))
3008 continue;
3009 if (ipv6_addr_equal(&ifp->addr, addr) &&
3010 (ifp->flags & IFA_F_HOMEADDRESS)) {
3011 ret = 1;
3012 break;
3013 }
3014 }
3015 read_unlock_bh(&addrconf_hash_lock);
3016 return ret;
3017 }
3018 #endif
3019
3020 /*
3021 * Periodic address status verification
3022 */
3023
3024 static void addrconf_verify(unsigned long foo)
3025 {
3026 struct inet6_ifaddr *ifp;
3027 unsigned long now, next;
3028 int i;
3029
3030 spin_lock_bh(&addrconf_verify_lock);
3031 now = jiffies;
3032 next = now + ADDR_CHECK_FREQUENCY;
3033
3034 del_timer(&addr_chk_timer);
3035
3036 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3037
3038 restart:
3039 read_lock(&addrconf_hash_lock);
3040 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3041 unsigned long age;
3042 #ifdef CONFIG_IPV6_PRIVACY
3043 unsigned long regen_advance;
3044 #endif
3045
3046 if (ifp->flags & IFA_F_PERMANENT)
3047 continue;
3048
3049 spin_lock(&ifp->lock);
3050 age = (now - ifp->tstamp) / HZ;
3051
3052 #ifdef CONFIG_IPV6_PRIVACY
3053 regen_advance = ifp->idev->cnf.regen_max_retry *
3054 ifp->idev->cnf.dad_transmits *
3055 ifp->idev->nd_parms->retrans_time / HZ;
3056 #endif
3057
3058 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3059 age >= ifp->valid_lft) {
3060 spin_unlock(&ifp->lock);
3061 in6_ifa_hold(ifp);
3062 read_unlock(&addrconf_hash_lock);
3063 ipv6_del_addr(ifp);
3064 goto restart;
3065 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3066 spin_unlock(&ifp->lock);
3067 continue;
3068 } else if (age >= ifp->prefered_lft) {
3069 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3070 int deprecate = 0;
3071
3072 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3073 deprecate = 1;
3074 ifp->flags |= IFA_F_DEPRECATED;
3075 }
3076
3077 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3078 next = ifp->tstamp + ifp->valid_lft * HZ;
3079
3080 spin_unlock(&ifp->lock);
3081
3082 if (deprecate) {
3083 in6_ifa_hold(ifp);
3084 read_unlock(&addrconf_hash_lock);
3085
3086 ipv6_ifa_notify(0, ifp);
3087 in6_ifa_put(ifp);
3088 goto restart;
3089 }
3090 #ifdef CONFIG_IPV6_PRIVACY
3091 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3092 !(ifp->flags&IFA_F_TENTATIVE)) {
3093 if (age >= ifp->prefered_lft - regen_advance) {
3094 struct inet6_ifaddr *ifpub = ifp->ifpub;
3095 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3096 next = ifp->tstamp + ifp->prefered_lft * HZ;
3097 if (!ifp->regen_count && ifpub) {
3098 ifp->regen_count++;
3099 in6_ifa_hold(ifp);
3100 in6_ifa_hold(ifpub);
3101 spin_unlock(&ifp->lock);
3102 read_unlock(&addrconf_hash_lock);
3103 spin_lock(&ifpub->lock);
3104 ifpub->regen_count = 0;
3105 spin_unlock(&ifpub->lock);
3106 ipv6_create_tempaddr(ifpub, ifp);
3107 in6_ifa_put(ifpub);
3108 in6_ifa_put(ifp);
3109 goto restart;
3110 }
3111 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3112 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3113 spin_unlock(&ifp->lock);
3114 #endif
3115 } else {
3116 /* ifp->prefered_lft <= ifp->valid_lft */
3117 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3118 next = ifp->tstamp + ifp->prefered_lft * HZ;
3119 spin_unlock(&ifp->lock);
3120 }
3121 }
3122 read_unlock(&addrconf_hash_lock);
3123 }
3124
3125 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3126 add_timer(&addr_chk_timer);
3127 spin_unlock_bh(&addrconf_verify_lock);
3128 }
3129
3130 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3131 {
3132 struct in6_addr *pfx = NULL;
3133
3134 if (addr)
3135 pfx = nla_data(addr);
3136
3137 if (local) {
3138 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3139 pfx = NULL;
3140 else
3141 pfx = nla_data(local);
3142 }
3143
3144 return pfx;
3145 }
3146
3147 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3148 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3149 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3150 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3151 };
3152
3153 static int
3154 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3155 {
3156 struct net *net = sock_net(skb->sk);
3157 struct ifaddrmsg *ifm;
3158 struct nlattr *tb[IFA_MAX+1];
3159 struct in6_addr *pfx;
3160 int err;
3161
3162 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3163 if (err < 0)
3164 return err;
3165
3166 ifm = nlmsg_data(nlh);
3167 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3168 if (pfx == NULL)
3169 return -EINVAL;
3170
3171 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3172 }
3173
3174 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3175 u32 prefered_lft, u32 valid_lft)
3176 {
3177 u32 flags;
3178 clock_t expires;
3179 unsigned long timeout;
3180
3181 if (!valid_lft || (prefered_lft > valid_lft))
3182 return -EINVAL;
3183
3184 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3185 if (addrconf_finite_timeout(timeout)) {
3186 expires = jiffies_to_clock_t(timeout * HZ);
3187 valid_lft = timeout;
3188 flags = RTF_EXPIRES;
3189 } else {
3190 expires = 0;
3191 flags = 0;
3192 ifa_flags |= IFA_F_PERMANENT;
3193 }
3194
3195 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3196 if (addrconf_finite_timeout(timeout)) {
3197 if (timeout == 0)
3198 ifa_flags |= IFA_F_DEPRECATED;
3199 prefered_lft = timeout;
3200 }
3201
3202 spin_lock_bh(&ifp->lock);
3203 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3204 ifp->tstamp = jiffies;
3205 ifp->valid_lft = valid_lft;
3206 ifp->prefered_lft = prefered_lft;
3207
3208 spin_unlock_bh(&ifp->lock);
3209 if (!(ifp->flags&IFA_F_TENTATIVE))
3210 ipv6_ifa_notify(0, ifp);
3211
3212 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3213 expires, flags);
3214 addrconf_verify(0);
3215
3216 return 0;
3217 }
3218
3219 static int
3220 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3221 {
3222 struct net *net = sock_net(skb->sk);
3223 struct ifaddrmsg *ifm;
3224 struct nlattr *tb[IFA_MAX+1];
3225 struct in6_addr *pfx;
3226 struct inet6_ifaddr *ifa;
3227 struct net_device *dev;
3228 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3229 u8 ifa_flags;
3230 int err;
3231
3232 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3233 if (err < 0)
3234 return err;
3235
3236 ifm = nlmsg_data(nlh);
3237 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3238 if (pfx == NULL)
3239 return -EINVAL;
3240
3241 if (tb[IFA_CACHEINFO]) {
3242 struct ifa_cacheinfo *ci;
3243
3244 ci = nla_data(tb[IFA_CACHEINFO]);
3245 valid_lft = ci->ifa_valid;
3246 preferred_lft = ci->ifa_prefered;
3247 } else {
3248 preferred_lft = INFINITY_LIFE_TIME;
3249 valid_lft = INFINITY_LIFE_TIME;
3250 }
3251
3252 dev = __dev_get_by_index(net, ifm->ifa_index);
3253 if (dev == NULL)
3254 return -ENODEV;
3255
3256 /* We ignore other flags so far. */
3257 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3258
3259 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3260 if (ifa == NULL) {
3261 /*
3262 * It would be best to check for !NLM_F_CREATE here but
3263 * userspace alreay relies on not having to provide this.
3264 */
3265 return inet6_addr_add(net, ifm->ifa_index, pfx,
3266 ifm->ifa_prefixlen, ifa_flags,
3267 preferred_lft, valid_lft);
3268 }
3269
3270 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3271 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3272 err = -EEXIST;
3273 else
3274 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3275
3276 in6_ifa_put(ifa);
3277
3278 return err;
3279 }
3280
3281 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3282 u8 scope, int ifindex)
3283 {
3284 struct ifaddrmsg *ifm;
3285
3286 ifm = nlmsg_data(nlh);
3287 ifm->ifa_family = AF_INET6;
3288 ifm->ifa_prefixlen = prefixlen;
3289 ifm->ifa_flags = flags;
3290 ifm->ifa_scope = scope;
3291 ifm->ifa_index = ifindex;
3292 }
3293
3294 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3295 unsigned long tstamp, u32 preferred, u32 valid)
3296 {
3297 struct ifa_cacheinfo ci;
3298
3299 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3300 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3301 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3302 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3303 ci.ifa_prefered = preferred;
3304 ci.ifa_valid = valid;
3305
3306 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3307 }
3308
3309 static inline int rt_scope(int ifa_scope)
3310 {
3311 if (ifa_scope & IFA_HOST)
3312 return RT_SCOPE_HOST;
3313 else if (ifa_scope & IFA_LINK)
3314 return RT_SCOPE_LINK;
3315 else if (ifa_scope & IFA_SITE)
3316 return RT_SCOPE_SITE;
3317 else
3318 return RT_SCOPE_UNIVERSE;
3319 }
3320
3321 static inline int inet6_ifaddr_msgsize(void)
3322 {
3323 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3324 + nla_total_size(16) /* IFA_ADDRESS */
3325 + nla_total_size(sizeof(struct ifa_cacheinfo));
3326 }
3327
3328 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3329 u32 pid, u32 seq, int event, unsigned int flags)
3330 {
3331 struct nlmsghdr *nlh;
3332 u32 preferred, valid;
3333
3334 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3335 if (nlh == NULL)
3336 return -EMSGSIZE;
3337
3338 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3339 ifa->idev->dev->ifindex);
3340
3341 if (!(ifa->flags&IFA_F_PERMANENT)) {
3342 preferred = ifa->prefered_lft;
3343 valid = ifa->valid_lft;
3344 if (preferred != INFINITY_LIFE_TIME) {
3345 long tval = (jiffies - ifa->tstamp)/HZ;
3346 preferred -= tval;
3347 if (valid != INFINITY_LIFE_TIME)
3348 valid -= tval;
3349 }
3350 } else {
3351 preferred = INFINITY_LIFE_TIME;
3352 valid = INFINITY_LIFE_TIME;
3353 }
3354
3355 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3356 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3357 nlmsg_cancel(skb, nlh);
3358 return -EMSGSIZE;
3359 }
3360
3361 return nlmsg_end(skb, nlh);
3362 }
3363
3364 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3365 u32 pid, u32 seq, int event, u16 flags)
3366 {
3367 struct nlmsghdr *nlh;
3368 u8 scope = RT_SCOPE_UNIVERSE;
3369 int ifindex = ifmca->idev->dev->ifindex;
3370
3371 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3372 scope = RT_SCOPE_SITE;
3373
3374 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3375 if (nlh == NULL)
3376 return -EMSGSIZE;
3377
3378 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3379 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3380 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3381 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3382 nlmsg_cancel(skb, nlh);
3383 return -EMSGSIZE;
3384 }
3385
3386 return nlmsg_end(skb, nlh);
3387 }
3388
3389 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3390 u32 pid, u32 seq, int event, unsigned int flags)
3391 {
3392 struct nlmsghdr *nlh;
3393 u8 scope = RT_SCOPE_UNIVERSE;
3394 int ifindex = ifaca->aca_idev->dev->ifindex;
3395
3396 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3397 scope = RT_SCOPE_SITE;
3398
3399 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3400 if (nlh == NULL)
3401 return -EMSGSIZE;
3402
3403 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3404 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3405 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3406 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3407 nlmsg_cancel(skb, nlh);
3408 return -EMSGSIZE;
3409 }
3410
3411 return nlmsg_end(skb, nlh);
3412 }
3413
3414 enum addr_type_t
3415 {
3416 UNICAST_ADDR,
3417 MULTICAST_ADDR,
3418 ANYCAST_ADDR,
3419 };
3420
3421 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3422 enum addr_type_t type)
3423 {
3424 int idx, ip_idx;
3425 int s_idx, s_ip_idx;
3426 int err = 1;
3427 struct net_device *dev;
3428 struct inet6_dev *idev = NULL;
3429 struct inet6_ifaddr *ifa;
3430 struct ifmcaddr6 *ifmca;
3431 struct ifacaddr6 *ifaca;
3432 struct net *net = sock_net(skb->sk);
3433
3434 s_idx = cb->args[0];
3435 s_ip_idx = ip_idx = cb->args[1];
3436
3437 idx = 0;
3438 for_each_netdev(net, dev) {
3439 if (idx < s_idx)
3440 goto cont;
3441 if (idx > s_idx)
3442 s_ip_idx = 0;
3443 ip_idx = 0;
3444 if ((idev = in6_dev_get(dev)) == NULL)
3445 goto cont;
3446 read_lock_bh(&idev->lock);
3447 switch (type) {
3448 case UNICAST_ADDR:
3449 /* unicast address incl. temp addr */
3450 for (ifa = idev->addr_list; ifa;
3451 ifa = ifa->if_next, ip_idx++) {
3452 if (ip_idx < s_ip_idx)
3453 continue;
3454 err = inet6_fill_ifaddr(skb, ifa,
3455 NETLINK_CB(cb->skb).pid,
3456 cb->nlh->nlmsg_seq,
3457 RTM_NEWADDR,
3458 NLM_F_MULTI);
3459 }
3460 break;
3461 case MULTICAST_ADDR:
3462 /* multicast address */
3463 for (ifmca = idev->mc_list; ifmca;
3464 ifmca = ifmca->next, ip_idx++) {
3465 if (ip_idx < s_ip_idx)
3466 continue;
3467 err = inet6_fill_ifmcaddr(skb, ifmca,
3468 NETLINK_CB(cb->skb).pid,
3469 cb->nlh->nlmsg_seq,
3470 RTM_GETMULTICAST,
3471 NLM_F_MULTI);
3472 }
3473 break;
3474 case ANYCAST_ADDR:
3475 /* anycast address */
3476 for (ifaca = idev->ac_list; ifaca;
3477 ifaca = ifaca->aca_next, ip_idx++) {
3478 if (ip_idx < s_ip_idx)
3479 continue;
3480 err = inet6_fill_ifacaddr(skb, ifaca,
3481 NETLINK_CB(cb->skb).pid,
3482 cb->nlh->nlmsg_seq,
3483 RTM_GETANYCAST,
3484 NLM_F_MULTI);
3485 }
3486 break;
3487 default:
3488 break;
3489 }
3490 read_unlock_bh(&idev->lock);
3491 in6_dev_put(idev);
3492
3493 if (err <= 0)
3494 break;
3495 cont:
3496 idx++;
3497 }
3498 cb->args[0] = idx;
3499 cb->args[1] = ip_idx;
3500 return skb->len;
3501 }
3502
3503 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3504 {
3505 enum addr_type_t type = UNICAST_ADDR;
3506
3507 return inet6_dump_addr(skb, cb, type);
3508 }
3509
3510 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3511 {
3512 enum addr_type_t type = MULTICAST_ADDR;
3513
3514 return inet6_dump_addr(skb, cb, type);
3515 }
3516
3517
3518 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3519 {
3520 enum addr_type_t type = ANYCAST_ADDR;
3521
3522 return inet6_dump_addr(skb, cb, type);
3523 }
3524
3525 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3526 void *arg)
3527 {
3528 struct net *net = sock_net(in_skb->sk);
3529 struct ifaddrmsg *ifm;
3530 struct nlattr *tb[IFA_MAX+1];
3531 struct in6_addr *addr = NULL;
3532 struct net_device *dev = NULL;
3533 struct inet6_ifaddr *ifa;
3534 struct sk_buff *skb;
3535 int err;
3536
3537 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3538 if (err < 0)
3539 goto errout;
3540
3541 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3542 if (addr == NULL) {
3543 err = -EINVAL;
3544 goto errout;
3545 }
3546
3547 ifm = nlmsg_data(nlh);
3548 if (ifm->ifa_index)
3549 dev = __dev_get_by_index(net, ifm->ifa_index);
3550
3551 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3552 err = -EADDRNOTAVAIL;
3553 goto errout;
3554 }
3555
3556 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3557 err = -ENOBUFS;
3558 goto errout_ifa;
3559 }
3560
3561 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3562 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3563 if (err < 0) {
3564 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3565 WARN_ON(err == -EMSGSIZE);
3566 kfree_skb(skb);
3567 goto errout_ifa;
3568 }
3569 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3570 errout_ifa:
3571 in6_ifa_put(ifa);
3572 errout:
3573 return err;
3574 }
3575
3576 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3577 {
3578 struct sk_buff *skb;
3579 struct net *net = dev_net(ifa->idev->dev);
3580 int err = -ENOBUFS;
3581
3582 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3583 if (skb == NULL)
3584 goto errout;
3585
3586 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3587 if (err < 0) {
3588 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3589 WARN_ON(err == -EMSGSIZE);
3590 kfree_skb(skb);
3591 goto errout;
3592 }
3593 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3594 errout:
3595 if (err < 0)
3596 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3597 }
3598
3599 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3600 __s32 *array, int bytes)
3601 {
3602 BUG_ON(bytes < (DEVCONF_MAX * 4));
3603
3604 memset(array, 0, bytes);
3605 array[DEVCONF_FORWARDING] = cnf->forwarding;
3606 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3607 array[DEVCONF_MTU6] = cnf->mtu6;
3608 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3609 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3610 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3611 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3612 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3613 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3614 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3615 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3616 #ifdef CONFIG_IPV6_PRIVACY
3617 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3618 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3619 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3620 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3621 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3622 #endif
3623 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3624 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3625 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3626 #ifdef CONFIG_IPV6_ROUTER_PREF
3627 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3628 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3629 #ifdef CONFIG_IPV6_ROUTE_INFO
3630 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3631 #endif
3632 #endif
3633 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3634 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3635 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3636 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3637 #endif
3638 #ifdef CONFIG_IPV6_MROUTE
3639 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3640 #endif
3641 }
3642
3643 static inline size_t inet6_if_nlmsg_size(void)
3644 {
3645 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3646 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3647 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3648 + nla_total_size(4) /* IFLA_MTU */
3649 + nla_total_size(4) /* IFLA_LINK */
3650 + nla_total_size( /* IFLA_PROTINFO */
3651 nla_total_size(4) /* IFLA_INET6_FLAGS */
3652 + nla_total_size(sizeof(struct ifla_cacheinfo))
3653 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3654 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3655 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3656 );
3657 }
3658
3659 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3660 int bytes)
3661 {
3662 int i;
3663 int pad = bytes - sizeof(u64) * items;
3664 BUG_ON(pad < 0);
3665
3666 /* Use put_unaligned() because stats may not be aligned for u64. */
3667 put_unaligned(items, &stats[0]);
3668 for (i = 1; i < items; i++)
3669 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3670
3671 memset(&stats[items], 0, pad);
3672 }
3673
3674 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3675 int bytes)
3676 {
3677 switch(attrtype) {
3678 case IFLA_INET6_STATS:
3679 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3680 break;
3681 case IFLA_INET6_ICMP6STATS:
3682 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3683 break;
3684 }
3685 }
3686
3687 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3688 u32 pid, u32 seq, int event, unsigned int flags)
3689 {
3690 struct net_device *dev = idev->dev;
3691 struct nlattr *nla;
3692 struct ifinfomsg *hdr;
3693 struct nlmsghdr *nlh;
3694 void *protoinfo;
3695 struct ifla_cacheinfo ci;
3696
3697 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3698 if (nlh == NULL)
3699 return -EMSGSIZE;
3700
3701 hdr = nlmsg_data(nlh);
3702 hdr->ifi_family = AF_INET6;
3703 hdr->__ifi_pad = 0;
3704 hdr->ifi_type = dev->type;
3705 hdr->ifi_index = dev->ifindex;
3706 hdr->ifi_flags = dev_get_flags(dev);
3707 hdr->ifi_change = 0;
3708
3709 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3710
3711 if (dev->addr_len)
3712 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3713
3714 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3715 if (dev->ifindex != dev->iflink)
3716 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3717
3718 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3719 if (protoinfo == NULL)
3720 goto nla_put_failure;
3721
3722 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3723
3724 ci.max_reasm_len = IPV6_MAXPLEN;
3725 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3726 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3727 ci.reachable_time = idev->nd_parms->reachable_time;
3728 ci.retrans_time = idev->nd_parms->retrans_time;
3729 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3730
3731 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3732 if (nla == NULL)
3733 goto nla_put_failure;
3734 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3735
3736 /* XXX - MC not implemented */
3737
3738 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3739 if (nla == NULL)
3740 goto nla_put_failure;
3741 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3742
3743 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3744 if (nla == NULL)
3745 goto nla_put_failure;
3746 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3747
3748 nla_nest_end(skb, protoinfo);
3749 return nlmsg_end(skb, nlh);
3750
3751 nla_put_failure:
3752 nlmsg_cancel(skb, nlh);
3753 return -EMSGSIZE;
3754 }
3755
3756 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3757 {
3758 struct net *net = sock_net(skb->sk);
3759 int idx, err;
3760 int s_idx = cb->args[0];
3761 struct net_device *dev;
3762 struct inet6_dev *idev;
3763
3764 read_lock(&dev_base_lock);
3765 idx = 0;
3766 for_each_netdev(net, dev) {
3767 if (idx < s_idx)
3768 goto cont;
3769 if ((idev = in6_dev_get(dev)) == NULL)
3770 goto cont;
3771 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3772 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3773 in6_dev_put(idev);
3774 if (err <= 0)
3775 break;
3776 cont:
3777 idx++;
3778 }
3779 read_unlock(&dev_base_lock);
3780 cb->args[0] = idx;
3781
3782 return skb->len;
3783 }
3784
3785 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3786 {
3787 struct sk_buff *skb;
3788 struct net *net = dev_net(idev->dev);
3789 int err = -ENOBUFS;
3790
3791 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3792 if (skb == NULL)
3793 goto errout;
3794
3795 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3796 if (err < 0) {
3797 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3798 WARN_ON(err == -EMSGSIZE);
3799 kfree_skb(skb);
3800 goto errout;
3801 }
3802 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3803 errout:
3804 if (err < 0)
3805 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3806 }
3807
3808 static inline size_t inet6_prefix_nlmsg_size(void)
3809 {
3810 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3811 + nla_total_size(sizeof(struct in6_addr))
3812 + nla_total_size(sizeof(struct prefix_cacheinfo));
3813 }
3814
3815 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3816 struct prefix_info *pinfo, u32 pid, u32 seq,
3817 int event, unsigned int flags)
3818 {
3819 struct prefixmsg *pmsg;
3820 struct nlmsghdr *nlh;
3821 struct prefix_cacheinfo ci;
3822
3823 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3824 if (nlh == NULL)
3825 return -EMSGSIZE;
3826
3827 pmsg = nlmsg_data(nlh);
3828 pmsg->prefix_family = AF_INET6;
3829 pmsg->prefix_pad1 = 0;
3830 pmsg->prefix_pad2 = 0;
3831 pmsg->prefix_ifindex = idev->dev->ifindex;
3832 pmsg->prefix_len = pinfo->prefix_len;
3833 pmsg->prefix_type = pinfo->type;
3834 pmsg->prefix_pad3 = 0;
3835 pmsg->prefix_flags = 0;
3836 if (pinfo->onlink)
3837 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3838 if (pinfo->autoconf)
3839 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3840
3841 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3842
3843 ci.preferred_time = ntohl(pinfo->prefered);
3844 ci.valid_time = ntohl(pinfo->valid);
3845 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3846
3847 return nlmsg_end(skb, nlh);
3848
3849 nla_put_failure:
3850 nlmsg_cancel(skb, nlh);
3851 return -EMSGSIZE;
3852 }
3853
3854 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3855 struct prefix_info *pinfo)
3856 {
3857 struct sk_buff *skb;
3858 struct net *net = dev_net(idev->dev);
3859 int err = -ENOBUFS;
3860
3861 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3862 if (skb == NULL)
3863 goto errout;
3864
3865 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3866 if (err < 0) {
3867 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3868 WARN_ON(err == -EMSGSIZE);
3869 kfree_skb(skb);
3870 goto errout;
3871 }
3872 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3873 errout:
3874 if (err < 0)
3875 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3876 }
3877
3878 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3879 {
3880 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3881
3882 switch (event) {
3883 case RTM_NEWADDR:
3884 /*
3885 * If the address was optimistic
3886 * we inserted the route at the start of
3887 * our DAD process, so we don't need
3888 * to do it again
3889 */
3890 if (!(ifp->rt->rt6i_node))
3891 ip6_ins_rt(ifp->rt);
3892 if (ifp->idev->cnf.forwarding)
3893 addrconf_join_anycast(ifp);
3894 break;
3895 case RTM_DELADDR:
3896 if (ifp->idev->cnf.forwarding)
3897 addrconf_leave_anycast(ifp);
3898 addrconf_leave_solict(ifp->idev, &ifp->addr);
3899 dst_hold(&ifp->rt->u.dst);
3900 if (ip6_del_rt(ifp->rt))
3901 dst_free(&ifp->rt->u.dst);
3902 break;
3903 }
3904 }
3905
3906 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3907 {
3908 rcu_read_lock_bh();
3909 if (likely(ifp->idev->dead == 0))
3910 __ipv6_ifa_notify(event, ifp);
3911 rcu_read_unlock_bh();
3912 }
3913
3914 #ifdef CONFIG_SYSCTL
3915
3916 static
3917 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3918 void __user *buffer, size_t *lenp, loff_t *ppos)
3919 {
3920 int *valp = ctl->data;
3921 int val = *valp;
3922 int ret;
3923
3924 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3925
3926 if (write)
3927 addrconf_fixup_forwarding(ctl, valp, val);
3928 return ret;
3929 }
3930
3931 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3932 int __user *name, int nlen,
3933 void __user *oldval,
3934 size_t __user *oldlenp,
3935 void __user *newval, size_t newlen)
3936 {
3937 int *valp = table->data;
3938 int val = *valp;
3939 int new;
3940
3941 if (!newval || !newlen)
3942 return 0;
3943 if (newlen != sizeof(int))
3944 return -EINVAL;
3945 if (get_user(new, (int __user *)newval))
3946 return -EFAULT;
3947 if (new == *valp)
3948 return 0;
3949 if (oldval && oldlenp) {
3950 size_t len;
3951 if (get_user(len, oldlenp))
3952 return -EFAULT;
3953 if (len) {
3954 if (len > table->maxlen)
3955 len = table->maxlen;
3956 if (copy_to_user(oldval, valp, len))
3957 return -EFAULT;
3958 if (put_user(len, oldlenp))
3959 return -EFAULT;
3960 }
3961 }
3962
3963 *valp = new;
3964 addrconf_fixup_forwarding(table, valp, val);
3965 return 1;
3966 }
3967
3968 static struct addrconf_sysctl_table
3969 {
3970 struct ctl_table_header *sysctl_header;
3971 ctl_table addrconf_vars[DEVCONF_MAX+1];
3972 char *dev_name;
3973 } addrconf_sysctl __read_mostly = {
3974 .sysctl_header = NULL,
3975 .addrconf_vars = {
3976 {
3977 .ctl_name = NET_IPV6_FORWARDING,
3978 .procname = "forwarding",
3979 .data = &ipv6_devconf.forwarding,
3980 .maxlen = sizeof(int),
3981 .mode = 0644,
3982 .proc_handler = &addrconf_sysctl_forward,
3983 .strategy = &addrconf_sysctl_forward_strategy,
3984 },
3985 {
3986 .ctl_name = NET_IPV6_HOP_LIMIT,
3987 .procname = "hop_limit",
3988 .data = &ipv6_devconf.hop_limit,
3989 .maxlen = sizeof(int),
3990 .mode = 0644,
3991 .proc_handler = proc_dointvec,
3992 },
3993 {
3994 .ctl_name = NET_IPV6_MTU,
3995 .procname = "mtu",
3996 .data = &ipv6_devconf.mtu6,
3997 .maxlen = sizeof(int),
3998 .mode = 0644,
3999 .proc_handler = &proc_dointvec,
4000 },
4001 {
4002 .ctl_name = NET_IPV6_ACCEPT_RA,
4003 .procname = "accept_ra",
4004 .data = &ipv6_devconf.accept_ra,
4005 .maxlen = sizeof(int),
4006 .mode = 0644,
4007 .proc_handler = &proc_dointvec,
4008 },
4009 {
4010 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
4011 .procname = "accept_redirects",
4012 .data = &ipv6_devconf.accept_redirects,
4013 .maxlen = sizeof(int),
4014 .mode = 0644,
4015 .proc_handler = &proc_dointvec,
4016 },
4017 {
4018 .ctl_name = NET_IPV6_AUTOCONF,
4019 .procname = "autoconf",
4020 .data = &ipv6_devconf.autoconf,
4021 .maxlen = sizeof(int),
4022 .mode = 0644,
4023 .proc_handler = &proc_dointvec,
4024 },
4025 {
4026 .ctl_name = NET_IPV6_DAD_TRANSMITS,
4027 .procname = "dad_transmits",
4028 .data = &ipv6_devconf.dad_transmits,
4029 .maxlen = sizeof(int),
4030 .mode = 0644,
4031 .proc_handler = &proc_dointvec,
4032 },
4033 {
4034 .ctl_name = NET_IPV6_RTR_SOLICITS,
4035 .procname = "router_solicitations",
4036 .data = &ipv6_devconf.rtr_solicits,
4037 .maxlen = sizeof(int),
4038 .mode = 0644,
4039 .proc_handler = &proc_dointvec,
4040 },
4041 {
4042 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
4043 .procname = "router_solicitation_interval",
4044 .data = &ipv6_devconf.rtr_solicit_interval,
4045 .maxlen = sizeof(int),
4046 .mode = 0644,
4047 .proc_handler = &proc_dointvec_jiffies,
4048 .strategy = &sysctl_jiffies,
4049 },
4050 {
4051 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
4052 .procname = "router_solicitation_delay",
4053 .data = &ipv6_devconf.rtr_solicit_delay,
4054 .maxlen = sizeof(int),
4055 .mode = 0644,
4056 .proc_handler = &proc_dointvec_jiffies,
4057 .strategy = &sysctl_jiffies,
4058 },
4059 {
4060 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
4061 .procname = "force_mld_version",
4062 .data = &ipv6_devconf.force_mld_version,
4063 .maxlen = sizeof(int),
4064 .mode = 0644,
4065 .proc_handler = &proc_dointvec,
4066 },
4067 #ifdef CONFIG_IPV6_PRIVACY
4068 {
4069 .ctl_name = NET_IPV6_USE_TEMPADDR,
4070 .procname = "use_tempaddr",
4071 .data = &ipv6_devconf.use_tempaddr,
4072 .maxlen = sizeof(int),
4073 .mode = 0644,
4074 .proc_handler = &proc_dointvec,
4075 },
4076 {
4077 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
4078 .procname = "temp_valid_lft",
4079 .data = &ipv6_devconf.temp_valid_lft,
4080 .maxlen = sizeof(int),
4081 .mode = 0644,
4082 .proc_handler = &proc_dointvec,
4083 },
4084 {
4085 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4086 .procname = "temp_prefered_lft",
4087 .data = &ipv6_devconf.temp_prefered_lft,
4088 .maxlen = sizeof(int),
4089 .mode = 0644,
4090 .proc_handler = &proc_dointvec,
4091 },
4092 {
4093 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4094 .procname = "regen_max_retry",
4095 .data = &ipv6_devconf.regen_max_retry,
4096 .maxlen = sizeof(int),
4097 .mode = 0644,
4098 .proc_handler = &proc_dointvec,
4099 },
4100 {
4101 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4102 .procname = "max_desync_factor",
4103 .data = &ipv6_devconf.max_desync_factor,
4104 .maxlen = sizeof(int),
4105 .mode = 0644,
4106 .proc_handler = &proc_dointvec,
4107 },
4108 #endif
4109 {
4110 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4111 .procname = "max_addresses",
4112 .data = &ipv6_devconf.max_addresses,
4113 .maxlen = sizeof(int),
4114 .mode = 0644,
4115 .proc_handler = &proc_dointvec,
4116 },
4117 {
4118 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4119 .procname = "accept_ra_defrtr",
4120 .data = &ipv6_devconf.accept_ra_defrtr,
4121 .maxlen = sizeof(int),
4122 .mode = 0644,
4123 .proc_handler = &proc_dointvec,
4124 },
4125 {
4126 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4127 .procname = "accept_ra_pinfo",
4128 .data = &ipv6_devconf.accept_ra_pinfo,
4129 .maxlen = sizeof(int),
4130 .mode = 0644,
4131 .proc_handler = &proc_dointvec,
4132 },
4133 #ifdef CONFIG_IPV6_ROUTER_PREF
4134 {
4135 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4136 .procname = "accept_ra_rtr_pref",
4137 .data = &ipv6_devconf.accept_ra_rtr_pref,
4138 .maxlen = sizeof(int),
4139 .mode = 0644,
4140 .proc_handler = &proc_dointvec,
4141 },
4142 {
4143 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4144 .procname = "router_probe_interval",
4145 .data = &ipv6_devconf.rtr_probe_interval,
4146 .maxlen = sizeof(int),
4147 .mode = 0644,
4148 .proc_handler = &proc_dointvec_jiffies,
4149 .strategy = &sysctl_jiffies,
4150 },
4151 #ifdef CONFIG_IPV6_ROUTE_INFO
4152 {
4153 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4154 .procname = "accept_ra_rt_info_max_plen",
4155 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4156 .maxlen = sizeof(int),
4157 .mode = 0644,
4158 .proc_handler = &proc_dointvec,
4159 },
4160 #endif
4161 #endif
4162 {
4163 .ctl_name = NET_IPV6_PROXY_NDP,
4164 .procname = "proxy_ndp",
4165 .data = &ipv6_devconf.proxy_ndp,
4166 .maxlen = sizeof(int),
4167 .mode = 0644,
4168 .proc_handler = &proc_dointvec,
4169 },
4170 {
4171 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4172 .procname = "accept_source_route",
4173 .data = &ipv6_devconf.accept_source_route,
4174 .maxlen = sizeof(int),
4175 .mode = 0644,
4176 .proc_handler = &proc_dointvec,
4177 },
4178 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4179 {
4180 .ctl_name = CTL_UNNUMBERED,
4181 .procname = "optimistic_dad",
4182 .data = &ipv6_devconf.optimistic_dad,
4183 .maxlen = sizeof(int),
4184 .mode = 0644,
4185 .proc_handler = &proc_dointvec,
4186
4187 },
4188 #endif
4189 #ifdef CONFIG_IPV6_MROUTE
4190 {
4191 .ctl_name = CTL_UNNUMBERED,
4192 .procname = "mc_forwarding",
4193 .data = &ipv6_devconf.mc_forwarding,
4194 .maxlen = sizeof(int),
4195 .mode = 0644,
4196 .proc_handler = &proc_dointvec,
4197 },
4198 #endif
4199 {
4200 .ctl_name = 0, /* sentinel */
4201 }
4202 },
4203 };
4204
4205 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4206 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4207 {
4208 int i;
4209 struct addrconf_sysctl_table *t;
4210
4211 #define ADDRCONF_CTL_PATH_DEV 3
4212
4213 struct ctl_path addrconf_ctl_path[] = {
4214 { .procname = "net", .ctl_name = CTL_NET, },
4215 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4216 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4217 { /* to be set */ },
4218 { },
4219 };
4220
4221
4222 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4223 if (t == NULL)
4224 goto out;
4225
4226 for (i=0; t->addrconf_vars[i].data; i++) {
4227 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4228 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4229 t->addrconf_vars[i].extra2 = net;
4230 }
4231
4232 /*
4233 * Make a copy of dev_name, because '.procname' is regarded as const
4234 * by sysctl and we wouldn't want anyone to change it under our feet
4235 * (see SIOCSIFNAME).
4236 */
4237 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4238 if (!t->dev_name)
4239 goto free;
4240
4241 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4242 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4243
4244 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4245 t->addrconf_vars);
4246 if (t->sysctl_header == NULL)
4247 goto free_procname;
4248
4249 p->sysctl = t;
4250 return 0;
4251
4252 free_procname:
4253 kfree(t->dev_name);
4254 free:
4255 kfree(t);
4256 out:
4257 return -ENOBUFS;
4258 }
4259
4260 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4261 {
4262 struct addrconf_sysctl_table *t;
4263
4264 if (p->sysctl == NULL)
4265 return;
4266
4267 t = p->sysctl;
4268 p->sysctl = NULL;
4269 unregister_sysctl_table(t->sysctl_header);
4270 kfree(t->dev_name);
4271 kfree(t);
4272 }
4273
4274 static void addrconf_sysctl_register(struct inet6_dev *idev)
4275 {
4276 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4277 NET_IPV6_NEIGH, "ipv6",
4278 &ndisc_ifinfo_sysctl_change,
4279 ndisc_ifinfo_sysctl_strategy);
4280 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4281 idev->dev->ifindex, idev, &idev->cnf);
4282 }
4283
4284 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4285 {
4286 __addrconf_sysctl_unregister(&idev->cnf);
4287 neigh_sysctl_unregister(idev->nd_parms);
4288 }
4289
4290
4291 #endif
4292
4293 static int addrconf_init_net(struct net *net)
4294 {
4295 int err;
4296 struct ipv6_devconf *all, *dflt;
4297
4298 err = -ENOMEM;
4299 all = &ipv6_devconf;
4300 dflt = &ipv6_devconf_dflt;
4301
4302 if (net != &init_net) {
4303 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4304 if (all == NULL)
4305 goto err_alloc_all;
4306
4307 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4308 if (dflt == NULL)
4309 goto err_alloc_dflt;
4310 }
4311
4312 net->ipv6.devconf_all = all;
4313 net->ipv6.devconf_dflt = dflt;
4314
4315 #ifdef CONFIG_SYSCTL
4316 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4317 NULL, all);
4318 if (err < 0)
4319 goto err_reg_all;
4320
4321 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4322 NULL, dflt);
4323 if (err < 0)
4324 goto err_reg_dflt;
4325 #endif
4326 return 0;
4327
4328 #ifdef CONFIG_SYSCTL
4329 err_reg_dflt:
4330 __addrconf_sysctl_unregister(all);
4331 err_reg_all:
4332 kfree(dflt);
4333 #endif
4334 err_alloc_dflt:
4335 kfree(all);
4336 err_alloc_all:
4337 return err;
4338 }
4339
4340 static void addrconf_exit_net(struct net *net)
4341 {
4342 #ifdef CONFIG_SYSCTL
4343 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4344 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4345 #endif
4346 if (net != &init_net) {
4347 kfree(net->ipv6.devconf_dflt);
4348 kfree(net->ipv6.devconf_all);
4349 }
4350 }
4351
4352 static struct pernet_operations addrconf_ops = {
4353 .init = addrconf_init_net,
4354 .exit = addrconf_exit_net,
4355 };
4356
4357 /*
4358 * Device notifier
4359 */
4360
4361 int register_inet6addr_notifier(struct notifier_block *nb)
4362 {
4363 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4364 }
4365
4366 EXPORT_SYMBOL(register_inet6addr_notifier);
4367
4368 int unregister_inet6addr_notifier(struct notifier_block *nb)
4369 {
4370 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4371 }
4372
4373 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4374
4375 static void addrconf_net_exit(struct net *net)
4376 {
4377 struct net_device *dev;
4378
4379 rtnl_lock();
4380 /* clean dev list */
4381 for_each_netdev(net, dev) {
4382 if (__in6_dev_get(dev) == NULL)
4383 continue;
4384 addrconf_ifdown(dev, 1);
4385 }
4386 addrconf_ifdown(net->loopback_dev, 2);
4387 rtnl_unlock();
4388 }
4389
4390 static struct pernet_operations addrconf_net_ops = {
4391 .exit = addrconf_net_exit,
4392 };
4393
4394 /*
4395 * Init / cleanup code
4396 */
4397
4398 int __init addrconf_init(void)
4399 {
4400 int err;
4401
4402 if ((err = ipv6_addr_label_init()) < 0) {
4403 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4404 err);
4405 return err;
4406 }
4407
4408 register_pernet_subsys(&addrconf_ops);
4409
4410 /* The addrconf netdev notifier requires that loopback_dev
4411 * has it's ipv6 private information allocated and setup
4412 * before it can bring up and give link-local addresses
4413 * to other devices which are up.
4414 *
4415 * Unfortunately, loopback_dev is not necessarily the first
4416 * entry in the global dev_base list of net devices. In fact,
4417 * it is likely to be the very last entry on that list.
4418 * So this causes the notifier registry below to try and
4419 * give link-local addresses to all devices besides loopback_dev
4420 * first, then loopback_dev, which cases all the non-loopback_dev
4421 * devices to fail to get a link-local address.
4422 *
4423 * So, as a temporary fix, allocate the ipv6 structure for
4424 * loopback_dev first by hand.
4425 * Longer term, all of the dependencies ipv6 has upon the loopback
4426 * device and it being up should be removed.
4427 */
4428 rtnl_lock();
4429 if (!ipv6_add_dev(init_net.loopback_dev))
4430 err = -ENOMEM;
4431 rtnl_unlock();
4432 if (err)
4433 goto errlo;
4434
4435 err = register_pernet_device(&addrconf_net_ops);
4436 if (err)
4437 return err;
4438
4439 register_netdevice_notifier(&ipv6_dev_notf);
4440
4441 addrconf_verify(0);
4442
4443 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4444 if (err < 0)
4445 goto errout;
4446
4447 /* Only the first call to __rtnl_register can fail */
4448 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4449 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4450 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4451 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4452 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4453
4454 ipv6_addr_label_rtnl_register();
4455
4456 return 0;
4457 errout:
4458 unregister_netdevice_notifier(&ipv6_dev_notf);
4459 errlo:
4460 unregister_pernet_subsys(&addrconf_ops);
4461
4462 return err;
4463 }
4464
4465 void addrconf_cleanup(void)
4466 {
4467 struct inet6_ifaddr *ifa;
4468 int i;
4469
4470 unregister_netdevice_notifier(&ipv6_dev_notf);
4471 unregister_pernet_device(&addrconf_net_ops);
4472
4473 unregister_pernet_subsys(&addrconf_ops);
4474
4475 rtnl_lock();
4476
4477 /*
4478 * Check hash table.
4479 */
4480 write_lock_bh(&addrconf_hash_lock);
4481 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4482 for (ifa=inet6_addr_lst[i]; ifa; ) {
4483 struct inet6_ifaddr *bifa;
4484
4485 bifa = ifa;
4486 ifa = ifa->lst_next;
4487 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4488 /* Do not free it; something is wrong.
4489 Now we can investigate it with debugger.
4490 */
4491 }
4492 }
4493 write_unlock_bh(&addrconf_hash_lock);
4494
4495 del_timer(&addr_chk_timer);
4496 rtnl_unlock();
4497
4498 unregister_pernet_subsys(&addrconf_net_ops);
4499 }
Support for the Chinese Samsung S3C2440 based development boards