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garp: retry sending JoinIn messages after allocation failures
[linux-2.6/mini2440.git] / net / ipv6 / addrconf.c
blob30184e0dd74c82146970b63e27c413748a85f9d7
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/net.h>
46 #include <linux/in6.h>
47 #include <linux/netdevice.h>
48 #include <linux/if_addr.h>
49 #include <linux/if_arp.h>
50 #include <linux/if_arcnet.h>
51 #include <linux/if_infiniband.h>
52 #include <linux/route.h>
53 #include <linux/inetdevice.h>
54 #include <linux/init.h>
55 #ifdef CONFIG_SYSCTL
56 #include <linux/sysctl.h>
57 #endif
58 #include <linux/capability.h>
59 #include <linux/delay.h>
60 #include <linux/notifier.h>
61 #include <linux/string.h>
62
63 #include <net/net_namespace.h>
64 #include <net/sock.h>
65 #include <net/snmp.h>
66
67 #include <net/ipv6.h>
68 #include <net/protocol.h>
69 #include <net/ndisc.h>
70 #include <net/ip6_route.h>
71 #include <net/addrconf.h>
72 #include <net/tcp.h>
73 #include <net/ip.h>
74 #include <net/netlink.h>
75 #include <net/pkt_sched.h>
76 #include <linux/if_tunnel.h>
77 #include <linux/rtnetlink.h>
78
79 #ifdef CONFIG_IPV6_PRIVACY
80 #include <linux/random.h>
81 #endif
82
83 #include <asm/uaccess.h>
84 #include <asm/unaligned.h>
85
86 #include <linux/proc_fs.h>
87 #include <linux/seq_file.h>
88
89 /* Set to 3 to get tracing... */
90 #define ACONF_DEBUG 2
91
92 #if ACONF_DEBUG >= 3
93 #define ADBG(x) printk x
94 #else
95 #define ADBG(x)
96 #endif
97
98 #define INFINITY_LIFE_TIME 0xFFFFFFFF
99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
100
101 #ifdef CONFIG_SYSCTL
102 static void addrconf_sysctl_register(struct inet6_dev *idev);
103 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
104 #else
105 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
106 {
107 }
108
109 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
110 {
111 }
112 #endif
113
114 #ifdef CONFIG_IPV6_PRIVACY
115 static int __ipv6_regen_rndid(struct inet6_dev *idev);
116 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
117 static void ipv6_regen_rndid(unsigned long data);
118
119 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
120 #endif
121
122 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
123 static int ipv6_count_addresses(struct inet6_dev *idev);
124
125 /*
126 * Configured unicast address hash table
127 */
128 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
129 static DEFINE_RWLOCK(addrconf_hash_lock);
130
131 static void addrconf_verify(unsigned long);
132
133 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
134 static DEFINE_SPINLOCK(addrconf_verify_lock);
135
136 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
137 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
138
139 static int addrconf_ifdown(struct net_device *dev, int how);
140
141 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
142 static void addrconf_dad_timer(unsigned long data);
143 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
144 static void addrconf_dad_run(struct inet6_dev *idev);
145 static void addrconf_rs_timer(unsigned long data);
146 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
147 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148
149 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
150 struct prefix_info *pinfo);
151 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
152 struct net_device *dev);
153
154 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
155
156 struct ipv6_devconf ipv6_devconf __read_mostly = {
157 .forwarding = 0,
158 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
159 .mtu6 = IPV6_MIN_MTU,
160 .accept_ra = 1,
161 .accept_redirects = 1,
162 .autoconf = 1,
163 .force_mld_version = 0,
164 .dad_transmits = 1,
165 .rtr_solicits = MAX_RTR_SOLICITATIONS,
166 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
167 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
168 #ifdef CONFIG_IPV6_PRIVACY
169 .use_tempaddr = 0,
170 .temp_valid_lft = TEMP_VALID_LIFETIME,
171 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
172 .regen_max_retry = REGEN_MAX_RETRY,
173 .max_desync_factor = MAX_DESYNC_FACTOR,
174 #endif
175 .max_addresses = IPV6_MAX_ADDRESSES,
176 .accept_ra_defrtr = 1,
177 .accept_ra_pinfo = 1,
178 #ifdef CONFIG_IPV6_ROUTER_PREF
179 .accept_ra_rtr_pref = 1,
180 .rtr_probe_interval = 60 * HZ,
181 #ifdef CONFIG_IPV6_ROUTE_INFO
182 .accept_ra_rt_info_max_plen = 0,
183 #endif
184 #endif
185 .proxy_ndp = 0,
186 .accept_source_route = 0, /* we do not accept RH0 by default. */
187 .disable_ipv6 = 0,
188 .accept_dad = 1,
189 };
190
191 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
192 .forwarding = 0,
193 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
194 .mtu6 = IPV6_MIN_MTU,
195 .accept_ra = 1,
196 .accept_redirects = 1,
197 .autoconf = 1,
198 .dad_transmits = 1,
199 .rtr_solicits = MAX_RTR_SOLICITATIONS,
200 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
202 #ifdef CONFIG_IPV6_PRIVACY
203 .use_tempaddr = 0,
204 .temp_valid_lft = TEMP_VALID_LIFETIME,
205 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
206 .regen_max_retry = REGEN_MAX_RETRY,
207 .max_desync_factor = MAX_DESYNC_FACTOR,
208 #endif
209 .max_addresses = IPV6_MAX_ADDRESSES,
210 .accept_ra_defrtr = 1,
211 .accept_ra_pinfo = 1,
212 #ifdef CONFIG_IPV6_ROUTER_PREF
213 .accept_ra_rtr_pref = 1,
214 .rtr_probe_interval = 60 * HZ,
215 #ifdef CONFIG_IPV6_ROUTE_INFO
216 .accept_ra_rt_info_max_plen = 0,
217 #endif
218 #endif
219 .proxy_ndp = 0,
220 .accept_source_route = 0, /* we do not accept RH0 by default. */
221 .disable_ipv6 = 0,
222 .accept_dad = 1,
223 };
224
225 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
226 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
227 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
228 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
229 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
230
231 /* Check if a valid qdisc is available */
232 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
233 {
234 return !qdisc_tx_is_noop(dev);
235 }
236
237 /* Check if a route is valid prefix route */
238 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
239 {
240 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
241 }
242
243 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
244 {
245 if (del_timer(&ifp->timer))
246 __in6_ifa_put(ifp);
247 }
248
249 enum addrconf_timer_t
250 {
251 AC_NONE,
252 AC_DAD,
253 AC_RS,
254 };
255
256 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
257 enum addrconf_timer_t what,
258 unsigned long when)
259 {
260 if (!del_timer(&ifp->timer))
261 in6_ifa_hold(ifp);
262
263 switch (what) {
264 case AC_DAD:
265 ifp->timer.function = addrconf_dad_timer;
266 break;
267 case AC_RS:
268 ifp->timer.function = addrconf_rs_timer;
269 break;
270 default:;
271 }
272 ifp->timer.expires = jiffies + when;
273 add_timer(&ifp->timer);
274 }
275
276 static int snmp6_alloc_dev(struct inet6_dev *idev)
277 {
278 if (snmp_mib_init((void **)idev->stats.ipv6,
279 sizeof(struct ipstats_mib)) < 0)
280 goto err_ip;
281 if (snmp_mib_init((void **)idev->stats.icmpv6,
282 sizeof(struct icmpv6_mib)) < 0)
283 goto err_icmp;
284 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
285 sizeof(struct icmpv6msg_mib)) < 0)
286 goto err_icmpmsg;
287
288 return 0;
289
290 err_icmpmsg:
291 snmp_mib_free((void **)idev->stats.icmpv6);
292 err_icmp:
293 snmp_mib_free((void **)idev->stats.ipv6);
294 err_ip:
295 return -ENOMEM;
296 }
297
298 static void snmp6_free_dev(struct inet6_dev *idev)
299 {
300 snmp_mib_free((void **)idev->stats.icmpv6msg);
301 snmp_mib_free((void **)idev->stats.icmpv6);
302 snmp_mib_free((void **)idev->stats.ipv6);
303 }
304
305 /* Nobody refers to this device, we may destroy it. */
306
307 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
308 {
309 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
310 kfree(idev);
311 }
312
313 void in6_dev_finish_destroy(struct inet6_dev *idev)
314 {
315 struct net_device *dev = idev->dev;
316 BUG_TRAP(idev->addr_list==NULL);
317 BUG_TRAP(idev->mc_list==NULL);
318 #ifdef NET_REFCNT_DEBUG
319 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
320 #endif
321 dev_put(dev);
322 if (!idev->dead) {
323 printk("Freeing alive inet6 device %p\n", idev);
324 return;
325 }
326 snmp6_free_dev(idev);
327 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
328 }
329
330 EXPORT_SYMBOL(in6_dev_finish_destroy);
331
332 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
333 {
334 struct inet6_dev *ndev;
335
336 ASSERT_RTNL();
337
338 if (dev->mtu < IPV6_MIN_MTU)
339 return NULL;
340
341 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
342
343 if (ndev == NULL)
344 return NULL;
345
346 rwlock_init(&ndev->lock);
347 ndev->dev = dev;
348 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
349 ndev->cnf.mtu6 = dev->mtu;
350 ndev->cnf.sysctl = NULL;
351 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
352 if (ndev->nd_parms == NULL) {
353 kfree(ndev);
354 return NULL;
355 }
356 if (ndev->cnf.forwarding)
357 dev_disable_lro(dev);
358 /* We refer to the device */
359 dev_hold(dev);
360
361 if (snmp6_alloc_dev(ndev) < 0) {
362 ADBG((KERN_WARNING
363 "%s(): cannot allocate memory for statistics; dev=%s.\n",
364 __func__, dev->name));
365 neigh_parms_release(&nd_tbl, ndev->nd_parms);
366 ndev->dead = 1;
367 in6_dev_finish_destroy(ndev);
368 return NULL;
369 }
370
371 if (snmp6_register_dev(ndev) < 0) {
372 ADBG((KERN_WARNING
373 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
374 __func__, dev->name));
375 neigh_parms_release(&nd_tbl, ndev->nd_parms);
376 ndev->dead = 1;
377 in6_dev_finish_destroy(ndev);
378 return NULL;
379 }
380
381 /* One reference from device. We must do this before
382 * we invoke __ipv6_regen_rndid().
383 */
384 in6_dev_hold(ndev);
385
386 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
387 ndev->cnf.accept_dad = -1;
388
389 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
390 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
391 printk(KERN_INFO
392 "%s: Disabled Multicast RS\n",
393 dev->name);
394 ndev->cnf.rtr_solicits = 0;
395 }
396 #endif
397
398 #ifdef CONFIG_IPV6_PRIVACY
399 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
400 if ((dev->flags&IFF_LOOPBACK) ||
401 dev->type == ARPHRD_TUNNEL ||
402 dev->type == ARPHRD_TUNNEL6 ||
403 dev->type == ARPHRD_SIT ||
404 dev->type == ARPHRD_NONE) {
405 printk(KERN_INFO
406 "%s: Disabled Privacy Extensions\n",
407 dev->name);
408 ndev->cnf.use_tempaddr = -1;
409 } else {
410 in6_dev_hold(ndev);
411 ipv6_regen_rndid((unsigned long) ndev);
412 }
413 #endif
414
415 if (netif_running(dev) && addrconf_qdisc_ok(dev))
416 ndev->if_flags |= IF_READY;
417
418 ipv6_mc_init_dev(ndev);
419 ndev->tstamp = jiffies;
420 addrconf_sysctl_register(ndev);
421 /* protected by rtnl_lock */
422 rcu_assign_pointer(dev->ip6_ptr, ndev);
423
424 /* Join all-node multicast group */
425 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
426
427 return ndev;
428 }
429
430 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
431 {
432 struct inet6_dev *idev;
433
434 ASSERT_RTNL();
435
436 if ((idev = __in6_dev_get(dev)) == NULL) {
437 if ((idev = ipv6_add_dev(dev)) == NULL)
438 return NULL;
439 }
440
441 if (dev->flags&IFF_UP)
442 ipv6_mc_up(idev);
443 return idev;
444 }
445
446 #ifdef CONFIG_SYSCTL
447 static void dev_forward_change(struct inet6_dev *idev)
448 {
449 struct net_device *dev;
450 struct inet6_ifaddr *ifa;
451
452 if (!idev)
453 return;
454 dev = idev->dev;
455 if (idev->cnf.forwarding)
456 dev_disable_lro(dev);
457 if (dev && (dev->flags & IFF_MULTICAST)) {
458 if (idev->cnf.forwarding)
459 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
460 else
461 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
462 }
463 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
464 if (ifa->flags&IFA_F_TENTATIVE)
465 continue;
466 if (idev->cnf.forwarding)
467 addrconf_join_anycast(ifa);
468 else
469 addrconf_leave_anycast(ifa);
470 }
471 }
472
473
474 static void addrconf_forward_change(struct net *net, __s32 newf)
475 {
476 struct net_device *dev;
477 struct inet6_dev *idev;
478
479 read_lock(&dev_base_lock);
480 for_each_netdev(net, dev) {
481 rcu_read_lock();
482 idev = __in6_dev_get(dev);
483 if (idev) {
484 int changed = (!idev->cnf.forwarding) ^ (!newf);
485 idev->cnf.forwarding = newf;
486 if (changed)
487 dev_forward_change(idev);
488 }
489 rcu_read_unlock();
490 }
491 read_unlock(&dev_base_lock);
492 }
493
494 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
495 {
496 struct net *net;
497
498 net = (struct net *)table->extra2;
499 if (p == &net->ipv6.devconf_dflt->forwarding)
500 return;
501
502 rtnl_lock();
503 if (p == &net->ipv6.devconf_all->forwarding) {
504 __s32 newf = net->ipv6.devconf_all->forwarding;
505 net->ipv6.devconf_dflt->forwarding = newf;
506 addrconf_forward_change(net, newf);
507 } else if ((!*p) ^ (!old))
508 dev_forward_change((struct inet6_dev *)table->extra1);
509 rtnl_unlock();
510
511 if (*p)
512 rt6_purge_dflt_routers(net);
513 }
514 #endif
515
516 /* Nobody refers to this ifaddr, destroy it */
517
518 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
519 {
520 BUG_TRAP(ifp->if_next==NULL);
521 BUG_TRAP(ifp->lst_next==NULL);
522 #ifdef NET_REFCNT_DEBUG
523 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
524 #endif
525
526 in6_dev_put(ifp->idev);
527
528 if (del_timer(&ifp->timer))
529 printk("Timer is still running, when freeing ifa=%p\n", ifp);
530
531 if (!ifp->dead) {
532 printk("Freeing alive inet6 address %p\n", ifp);
533 return;
534 }
535 dst_release(&ifp->rt->u.dst);
536
537 kfree(ifp);
538 }
539
540 static void
541 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
542 {
543 struct inet6_ifaddr *ifa, **ifap;
544 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
545
546 /*
547 * Each device address list is sorted in order of scope -
548 * global before linklocal.
549 */
550 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
551 ifap = &ifa->if_next) {
552 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
553 break;
554 }
555
556 ifp->if_next = *ifap;
557 *ifap = ifp;
558 }
559
560 /*
561 * Hash function taken from net_alias.c
562 */
563 static u8 ipv6_addr_hash(const struct in6_addr *addr)
564 {
565 __u32 word;
566
567 /*
568 * We perform the hash function over the last 64 bits of the address
569 * This will include the IEEE address token on links that support it.
570 */
571
572 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
573 word ^= (word >> 16);
574 word ^= (word >> 8);
575
576 return ((word ^ (word >> 4)) & 0x0f);
577 }
578
579 /* On success it returns ifp with increased reference count */
580
581 static struct inet6_ifaddr *
582 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
583 int scope, u32 flags)
584 {
585 struct inet6_ifaddr *ifa = NULL;
586 struct rt6_info *rt;
587 int hash;
588 int err = 0;
589 int addr_type = ipv6_addr_type(addr);
590
591 if (addr_type == IPV6_ADDR_ANY ||
592 addr_type & IPV6_ADDR_MULTICAST ||
593 (!(idev->dev->flags & IFF_LOOPBACK) &&
594 addr_type & IPV6_ADDR_LOOPBACK))
595 return ERR_PTR(-EADDRNOTAVAIL);
596
597 rcu_read_lock_bh();
598 if (idev->dead) {
599 err = -ENODEV; /*XXX*/
600 goto out2;
601 }
602
603 write_lock(&addrconf_hash_lock);
604
605 /* Ignore adding duplicate addresses on an interface */
606 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
607 ADBG(("ipv6_add_addr: already assigned\n"));
608 err = -EEXIST;
609 goto out;
610 }
611
612 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
613
614 if (ifa == NULL) {
615 ADBG(("ipv6_add_addr: malloc failed\n"));
616 err = -ENOBUFS;
617 goto out;
618 }
619
620 rt = addrconf_dst_alloc(idev, addr, 0);
621 if (IS_ERR(rt)) {
622 err = PTR_ERR(rt);
623 goto out;
624 }
625
626 ipv6_addr_copy(&ifa->addr, addr);
627
628 spin_lock_init(&ifa->lock);
629 init_timer(&ifa->timer);
630 ifa->timer.data = (unsigned long) ifa;
631 ifa->scope = scope;
632 ifa->prefix_len = pfxlen;
633 ifa->flags = flags | IFA_F_TENTATIVE;
634 ifa->cstamp = ifa->tstamp = jiffies;
635
636 ifa->rt = rt;
637
638 /*
639 * part one of RFC 4429, section 3.3
640 * We should not configure an address as
641 * optimistic if we do not yet know the link
642 * layer address of our nexhop router
643 */
644
645 if (rt->rt6i_nexthop == NULL)
646 ifa->flags &= ~IFA_F_OPTIMISTIC;
647
648 ifa->idev = idev;
649 in6_dev_hold(idev);
650 /* For caller */
651 in6_ifa_hold(ifa);
652
653 /* Add to big hash table */
654 hash = ipv6_addr_hash(addr);
655
656 ifa->lst_next = inet6_addr_lst[hash];
657 inet6_addr_lst[hash] = ifa;
658 in6_ifa_hold(ifa);
659 write_unlock(&addrconf_hash_lock);
660
661 write_lock(&idev->lock);
662 /* Add to inet6_dev unicast addr list. */
663 ipv6_link_dev_addr(idev, ifa);
664
665 #ifdef CONFIG_IPV6_PRIVACY
666 if (ifa->flags&IFA_F_TEMPORARY) {
667 ifa->tmp_next = idev->tempaddr_list;
668 idev->tempaddr_list = ifa;
669 in6_ifa_hold(ifa);
670 }
671 #endif
672
673 in6_ifa_hold(ifa);
674 write_unlock(&idev->lock);
675 out2:
676 rcu_read_unlock_bh();
677
678 if (likely(err == 0))
679 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
680 else {
681 kfree(ifa);
682 ifa = ERR_PTR(err);
683 }
684
685 return ifa;
686 out:
687 write_unlock(&addrconf_hash_lock);
688 goto out2;
689 }
690
691 /* This function wants to get referenced ifp and releases it before return */
692
693 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
694 {
695 struct inet6_ifaddr *ifa, **ifap;
696 struct inet6_dev *idev = ifp->idev;
697 int hash;
698 int deleted = 0, onlink = 0;
699 unsigned long expires = jiffies;
700
701 hash = ipv6_addr_hash(&ifp->addr);
702
703 ifp->dead = 1;
704
705 write_lock_bh(&addrconf_hash_lock);
706 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
707 ifap = &ifa->lst_next) {
708 if (ifa == ifp) {
709 *ifap = ifa->lst_next;
710 __in6_ifa_put(ifp);
711 ifa->lst_next = NULL;
712 break;
713 }
714 }
715 write_unlock_bh(&addrconf_hash_lock);
716
717 write_lock_bh(&idev->lock);
718 #ifdef CONFIG_IPV6_PRIVACY
719 if (ifp->flags&IFA_F_TEMPORARY) {
720 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
721 ifap = &ifa->tmp_next) {
722 if (ifa == ifp) {
723 *ifap = ifa->tmp_next;
724 if (ifp->ifpub) {
725 in6_ifa_put(ifp->ifpub);
726 ifp->ifpub = NULL;
727 }
728 __in6_ifa_put(ifp);
729 ifa->tmp_next = NULL;
730 break;
731 }
732 }
733 }
734 #endif
735
736 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
737 if (ifa == ifp) {
738 *ifap = ifa->if_next;
739 __in6_ifa_put(ifp);
740 ifa->if_next = NULL;
741 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
742 break;
743 deleted = 1;
744 continue;
745 } else if (ifp->flags & IFA_F_PERMANENT) {
746 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
747 ifp->prefix_len)) {
748 if (ifa->flags & IFA_F_PERMANENT) {
749 onlink = 1;
750 if (deleted)
751 break;
752 } else {
753 unsigned long lifetime;
754
755 if (!onlink)
756 onlink = -1;
757
758 spin_lock(&ifa->lock);
759
760 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
761 /*
762 * Note: Because this address is
763 * not permanent, lifetime <
764 * LONG_MAX / HZ here.
765 */
766 if (time_before(expires,
767 ifa->tstamp + lifetime * HZ))
768 expires = ifa->tstamp + lifetime * HZ;
769 spin_unlock(&ifa->lock);
770 }
771 }
772 }
773 ifap = &ifa->if_next;
774 }
775 write_unlock_bh(&idev->lock);
776
777 addrconf_del_timer(ifp);
778
779 ipv6_ifa_notify(RTM_DELADDR, ifp);
780
781 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
782
783 /*
784 * Purge or update corresponding prefix
785 *
786 * 1) we don't purge prefix here if address was not permanent.
787 * prefix is managed by its own lifetime.
788 * 2) if there're no addresses, delete prefix.
789 * 3) if there're still other permanent address(es),
790 * corresponding prefix is still permanent.
791 * 4) otherwise, update prefix lifetime to the
792 * longest valid lifetime among the corresponding
793 * addresses on the device.
794 * Note: subsequent RA will update lifetime.
795 *
796 * --yoshfuji
797 */
798 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
799 struct in6_addr prefix;
800 struct rt6_info *rt;
801 struct net *net = dev_net(ifp->idev->dev);
802 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
803 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
804
805 if (rt && addrconf_is_prefix_route(rt)) {
806 if (onlink == 0) {
807 ip6_del_rt(rt);
808 rt = NULL;
809 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
810 rt->rt6i_expires = expires;
811 rt->rt6i_flags |= RTF_EXPIRES;
812 }
813 }
814 dst_release(&rt->u.dst);
815 }
816
817 in6_ifa_put(ifp);
818 }
819
820 #ifdef CONFIG_IPV6_PRIVACY
821 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
822 {
823 struct inet6_dev *idev = ifp->idev;
824 struct in6_addr addr, *tmpaddr;
825 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
826 unsigned long regen_advance;
827 int tmp_plen;
828 int ret = 0;
829 int max_addresses;
830 u32 addr_flags;
831
832 write_lock(&idev->lock);
833 if (ift) {
834 spin_lock_bh(&ift->lock);
835 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
836 spin_unlock_bh(&ift->lock);
837 tmpaddr = &addr;
838 } else {
839 tmpaddr = NULL;
840 }
841 retry:
842 in6_dev_hold(idev);
843 if (idev->cnf.use_tempaddr <= 0) {
844 write_unlock(&idev->lock);
845 printk(KERN_INFO
846 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
847 in6_dev_put(idev);
848 ret = -1;
849 goto out;
850 }
851 spin_lock_bh(&ifp->lock);
852 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
853 idev->cnf.use_tempaddr = -1; /*XXX*/
854 spin_unlock_bh(&ifp->lock);
855 write_unlock(&idev->lock);
856 printk(KERN_WARNING
857 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
858 in6_dev_put(idev);
859 ret = -1;
860 goto out;
861 }
862 in6_ifa_hold(ifp);
863 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
864 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
865 spin_unlock_bh(&ifp->lock);
866 write_unlock(&idev->lock);
867 printk(KERN_WARNING
868 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
869 in6_ifa_put(ifp);
870 in6_dev_put(idev);
871 ret = -1;
872 goto out;
873 }
874 memcpy(&addr.s6_addr[8], idev->rndid, 8);
875 tmp_valid_lft = min_t(__u32,
876 ifp->valid_lft,
877 idev->cnf.temp_valid_lft);
878 tmp_prefered_lft = min_t(__u32,
879 ifp->prefered_lft,
880 idev->cnf.temp_prefered_lft - desync_factor / HZ);
881 tmp_plen = ifp->prefix_len;
882 max_addresses = idev->cnf.max_addresses;
883 tmp_cstamp = ifp->cstamp;
884 tmp_tstamp = ifp->tstamp;
885 spin_unlock_bh(&ifp->lock);
886
887 regen_advance = idev->cnf.regen_max_retry *
888 idev->cnf.dad_transmits *
889 idev->nd_parms->retrans_time / HZ;
890 write_unlock(&idev->lock);
891
892 /* A temporary address is created only if this calculated Preferred
893 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
894 * an implementation must not create a temporary address with a zero
895 * Preferred Lifetime.
896 */
897 if (tmp_prefered_lft <= regen_advance) {
898 in6_ifa_put(ifp);
899 in6_dev_put(idev);
900 ret = -1;
901 goto out;
902 }
903
904 addr_flags = IFA_F_TEMPORARY;
905 /* set in addrconf_prefix_rcv() */
906 if (ifp->flags & IFA_F_OPTIMISTIC)
907 addr_flags |= IFA_F_OPTIMISTIC;
908
909 ift = !max_addresses ||
910 ipv6_count_addresses(idev) < max_addresses ?
911 ipv6_add_addr(idev, &addr, tmp_plen,
912 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
913 addr_flags) : NULL;
914 if (!ift || IS_ERR(ift)) {
915 in6_ifa_put(ifp);
916 in6_dev_put(idev);
917 printk(KERN_INFO
918 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
919 tmpaddr = &addr;
920 write_lock(&idev->lock);
921 goto retry;
922 }
923
924 spin_lock_bh(&ift->lock);
925 ift->ifpub = ifp;
926 ift->valid_lft = tmp_valid_lft;
927 ift->prefered_lft = tmp_prefered_lft;
928 ift->cstamp = tmp_cstamp;
929 ift->tstamp = tmp_tstamp;
930 spin_unlock_bh(&ift->lock);
931
932 addrconf_dad_start(ift, 0);
933 in6_ifa_put(ift);
934 in6_dev_put(idev);
935 out:
936 return ret;
937 }
938 #endif
939
940 /*
941 * Choose an appropriate source address (RFC3484)
942 */
943 enum {
944 IPV6_SADDR_RULE_INIT = 0,
945 IPV6_SADDR_RULE_LOCAL,
946 IPV6_SADDR_RULE_SCOPE,
947 IPV6_SADDR_RULE_PREFERRED,
948 #ifdef CONFIG_IPV6_MIP6
949 IPV6_SADDR_RULE_HOA,
950 #endif
951 IPV6_SADDR_RULE_OIF,
952 IPV6_SADDR_RULE_LABEL,
953 #ifdef CONFIG_IPV6_PRIVACY
954 IPV6_SADDR_RULE_PRIVACY,
955 #endif
956 IPV6_SADDR_RULE_ORCHID,
957 IPV6_SADDR_RULE_PREFIX,
958 IPV6_SADDR_RULE_MAX
959 };
960
961 struct ipv6_saddr_score {
962 int rule;
963 int addr_type;
964 struct inet6_ifaddr *ifa;
965 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
966 int scopedist;
967 int matchlen;
968 };
969
970 struct ipv6_saddr_dst {
971 const struct in6_addr *addr;
972 int ifindex;
973 int scope;
974 int label;
975 unsigned int prefs;
976 };
977
978 static inline int ipv6_saddr_preferred(int type)
979 {
980 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
981 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
982 return 1;
983 return 0;
984 }
985
986 static int ipv6_get_saddr_eval(struct net *net,
987 struct ipv6_saddr_score *score,
988 struct ipv6_saddr_dst *dst,
989 int i)
990 {
991 int ret;
992
993 if (i <= score->rule) {
994 switch (i) {
995 case IPV6_SADDR_RULE_SCOPE:
996 ret = score->scopedist;
997 break;
998 case IPV6_SADDR_RULE_PREFIX:
999 ret = score->matchlen;
1000 break;
1001 default:
1002 ret = !!test_bit(i, score->scorebits);
1003 }
1004 goto out;
1005 }
1006
1007 switch (i) {
1008 case IPV6_SADDR_RULE_INIT:
1009 /* Rule 0: remember if hiscore is not ready yet */
1010 ret = !!score->ifa;
1011 break;
1012 case IPV6_SADDR_RULE_LOCAL:
1013 /* Rule 1: Prefer same address */
1014 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1015 break;
1016 case IPV6_SADDR_RULE_SCOPE:
1017 /* Rule 2: Prefer appropriate scope
1018 *
1019 * ret
1020 * ^
1021 * -1 | d 15
1022 * ---+--+-+---> scope
1023 * |
1024 * | d is scope of the destination.
1025 * B-d | \
1026 * | \ <- smaller scope is better if
1027 * B-15 | \ if scope is enough for destinaion.
1028 * | ret = B - scope (-1 <= scope >= d <= 15).
1029 * d-C-1 | /
1030 * |/ <- greater is better
1031 * -C / if scope is not enough for destination.
1032 * /| ret = scope - C (-1 <= d < scope <= 15).
1033 *
1034 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1035 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1036 * Assume B = 0 and we get C > 29.
1037 */
1038 ret = __ipv6_addr_src_scope(score->addr_type);
1039 if (ret >= dst->scope)
1040 ret = -ret;
1041 else
1042 ret -= 128; /* 30 is enough */
1043 score->scopedist = ret;
1044 break;
1045 case IPV6_SADDR_RULE_PREFERRED:
1046 /* Rule 3: Avoid deprecated and optimistic addresses */
1047 ret = ipv6_saddr_preferred(score->addr_type) ||
1048 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1049 break;
1050 #ifdef CONFIG_IPV6_MIP6
1051 case IPV6_SADDR_RULE_HOA:
1052 {
1053 /* Rule 4: Prefer home address */
1054 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1055 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1056 break;
1057 }
1058 #endif
1059 case IPV6_SADDR_RULE_OIF:
1060 /* Rule 5: Prefer outgoing interface */
1061 ret = (!dst->ifindex ||
1062 dst->ifindex == score->ifa->idev->dev->ifindex);
1063 break;
1064 case IPV6_SADDR_RULE_LABEL:
1065 /* Rule 6: Prefer matching label */
1066 ret = ipv6_addr_label(net,
1067 &score->ifa->addr, score->addr_type,
1068 score->ifa->idev->dev->ifindex) == dst->label;
1069 break;
1070 #ifdef CONFIG_IPV6_PRIVACY
1071 case IPV6_SADDR_RULE_PRIVACY:
1072 {
1073 /* Rule 7: Prefer public address
1074 * Note: prefer temprary address if use_tempaddr >= 2
1075 */
1076 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1077 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1078 score->ifa->idev->cnf.use_tempaddr >= 2;
1079 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1080 break;
1081 }
1082 #endif
1083 case IPV6_SADDR_RULE_ORCHID:
1084 /* Rule 8-: Prefer ORCHID vs ORCHID or
1085 * non-ORCHID vs non-ORCHID
1086 */
1087 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1088 ipv6_addr_orchid(dst->addr));
1089 break;
1090 case IPV6_SADDR_RULE_PREFIX:
1091 /* Rule 8: Use longest matching prefix */
1092 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1093 dst->addr);
1094 break;
1095 default:
1096 ret = 0;
1097 }
1098
1099 if (ret)
1100 __set_bit(i, score->scorebits);
1101 score->rule = i;
1102 out:
1103 return ret;
1104 }
1105
1106 int ipv6_dev_get_saddr(struct net_device *dst_dev,
1107 const struct in6_addr *daddr, unsigned int prefs,
1108 struct in6_addr *saddr)
1109 {
1110 struct ipv6_saddr_score scores[2],
1111 *score = &scores[0], *hiscore = &scores[1];
1112 struct net *net = dev_net(dst_dev);
1113 struct ipv6_saddr_dst dst;
1114 struct net_device *dev;
1115 int dst_type;
1116
1117 dst_type = __ipv6_addr_type(daddr);
1118 dst.addr = daddr;
1119 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1120 dst.scope = __ipv6_addr_src_scope(dst_type);
1121 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1122 dst.prefs = prefs;
1123
1124 hiscore->rule = -1;
1125 hiscore->ifa = NULL;
1126
1127 read_lock(&dev_base_lock);
1128 rcu_read_lock();
1129
1130 for_each_netdev(net, dev) {
1131 struct inet6_dev *idev;
1132
1133 /* Candidate Source Address (section 4)
1134 * - multicast and link-local destination address,
1135 * the set of candidate source address MUST only
1136 * include addresses assigned to interfaces
1137 * belonging to the same link as the outgoing
1138 * interface.
1139 * (- For site-local destination addresses, the
1140 * set of candidate source addresses MUST only
1141 * include addresses assigned to interfaces
1142 * belonging to the same site as the outgoing
1143 * interface.)
1144 */
1145 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1146 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1147 dst.ifindex && dev->ifindex != dst.ifindex)
1148 continue;
1149
1150 idev = __in6_dev_get(dev);
1151 if (!idev)
1152 continue;
1153
1154 read_lock_bh(&idev->lock);
1155 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1156 int i;
1157
1158 /*
1159 * - Tentative Address (RFC2462 section 5.4)
1160 * - A tentative address is not considered
1161 * "assigned to an interface" in the traditional
1162 * sense, unless it is also flagged as optimistic.
1163 * - Candidate Source Address (section 4)
1164 * - In any case, anycast addresses, multicast
1165 * addresses, and the unspecified address MUST
1166 * NOT be included in a candidate set.
1167 */
1168 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1169 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1170 continue;
1171
1172 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1173
1174 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1175 score->addr_type & IPV6_ADDR_MULTICAST)) {
1176 LIMIT_NETDEBUG(KERN_DEBUG
1177 "ADDRCONF: unspecified / multicast address "
1178 "assigned as unicast address on %s",
1179 dev->name);
1180 continue;
1181 }
1182
1183 score->rule = -1;
1184 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1185
1186 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1187 int minihiscore, miniscore;
1188
1189 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1190 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1191
1192 if (minihiscore > miniscore) {
1193 if (i == IPV6_SADDR_RULE_SCOPE &&
1194 score->scopedist > 0) {
1195 /*
1196 * special case:
1197 * each remaining entry
1198 * has too small (not enough)
1199 * scope, because ifa entries
1200 * are sorted by their scope
1201 * values.
1202 */
1203 goto try_nextdev;
1204 }
1205 break;
1206 } else if (minihiscore < miniscore) {
1207 struct ipv6_saddr_score *tmp;
1208
1209 if (hiscore->ifa)
1210 in6_ifa_put(hiscore->ifa);
1211
1212 in6_ifa_hold(score->ifa);
1213
1214 tmp = hiscore;
1215 hiscore = score;
1216 score = tmp;
1217
1218 /* restore our iterator */
1219 score->ifa = hiscore->ifa;
1220
1221 break;
1222 }
1223 }
1224 }
1225 try_nextdev:
1226 read_unlock_bh(&idev->lock);
1227 }
1228 rcu_read_unlock();
1229 read_unlock(&dev_base_lock);
1230
1231 if (!hiscore->ifa)
1232 return -EADDRNOTAVAIL;
1233
1234 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1235 in6_ifa_put(hiscore->ifa);
1236 return 0;
1237 }
1238
1239 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1240
1241 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1242 unsigned char banned_flags)
1243 {
1244 struct inet6_dev *idev;
1245 int err = -EADDRNOTAVAIL;
1246
1247 rcu_read_lock();
1248 if ((idev = __in6_dev_get(dev)) != NULL) {
1249 struct inet6_ifaddr *ifp;
1250
1251 read_lock_bh(&idev->lock);
1252 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1253 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1254 ipv6_addr_copy(addr, &ifp->addr);
1255 err = 0;
1256 break;
1257 }
1258 }
1259 read_unlock_bh(&idev->lock);
1260 }
1261 rcu_read_unlock();
1262 return err;
1263 }
1264
1265 static int ipv6_count_addresses(struct inet6_dev *idev)
1266 {
1267 int cnt = 0;
1268 struct inet6_ifaddr *ifp;
1269
1270 read_lock_bh(&idev->lock);
1271 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1272 cnt++;
1273 read_unlock_bh(&idev->lock);
1274 return cnt;
1275 }
1276
1277 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1278 struct net_device *dev, int strict)
1279 {
1280 struct inet6_ifaddr * ifp;
1281 u8 hash = ipv6_addr_hash(addr);
1282
1283 read_lock_bh(&addrconf_hash_lock);
1284 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1285 if (!net_eq(dev_net(ifp->idev->dev), net))
1286 continue;
1287 if (ipv6_addr_equal(&ifp->addr, addr) &&
1288 !(ifp->flags&IFA_F_TENTATIVE)) {
1289 if (dev == NULL || ifp->idev->dev == dev ||
1290 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1291 break;
1292 }
1293 }
1294 read_unlock_bh(&addrconf_hash_lock);
1295 return ifp != NULL;
1296 }
1297 EXPORT_SYMBOL(ipv6_chk_addr);
1298
1299 static
1300 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1301 struct net_device *dev)
1302 {
1303 struct inet6_ifaddr * ifp;
1304 u8 hash = ipv6_addr_hash(addr);
1305
1306 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1307 if (!net_eq(dev_net(ifp->idev->dev), net))
1308 continue;
1309 if (ipv6_addr_equal(&ifp->addr, addr)) {
1310 if (dev == NULL || ifp->idev->dev == dev)
1311 break;
1312 }
1313 }
1314 return ifp != NULL;
1315 }
1316
1317 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1318 {
1319 struct inet6_dev *idev;
1320 struct inet6_ifaddr *ifa;
1321 int onlink;
1322
1323 onlink = 0;
1324 rcu_read_lock();
1325 idev = __in6_dev_get(dev);
1326 if (idev) {
1327 read_lock_bh(&idev->lock);
1328 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1329 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1330 ifa->prefix_len);
1331 if (onlink)
1332 break;
1333 }
1334 read_unlock_bh(&idev->lock);
1335 }
1336 rcu_read_unlock();
1337 return onlink;
1338 }
1339
1340 EXPORT_SYMBOL(ipv6_chk_prefix);
1341
1342 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1343 struct net_device *dev, int strict)
1344 {
1345 struct inet6_ifaddr * ifp;
1346 u8 hash = ipv6_addr_hash(addr);
1347
1348 read_lock_bh(&addrconf_hash_lock);
1349 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1350 if (!net_eq(dev_net(ifp->idev->dev), net))
1351 continue;
1352 if (ipv6_addr_equal(&ifp->addr, addr)) {
1353 if (dev == NULL || ifp->idev->dev == dev ||
1354 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1355 in6_ifa_hold(ifp);
1356 break;
1357 }
1358 }
1359 }
1360 read_unlock_bh(&addrconf_hash_lock);
1361
1362 return ifp;
1363 }
1364
1365 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1366 {
1367 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1368 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1369 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1370 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1371 int sk_ipv6only = ipv6_only_sock(sk);
1372 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1373 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1374 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1375
1376 if (!sk2_rcv_saddr && !sk_ipv6only)
1377 return 1;
1378
1379 if (addr_type2 == IPV6_ADDR_ANY &&
1380 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1381 return 1;
1382
1383 if (addr_type == IPV6_ADDR_ANY &&
1384 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1385 return 1;
1386
1387 if (sk2_rcv_saddr6 &&
1388 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1389 return 1;
1390
1391 if (addr_type == IPV6_ADDR_MAPPED &&
1392 !sk2_ipv6only &&
1393 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1394 return 1;
1395
1396 return 0;
1397 }
1398
1399 /* Gets referenced address, destroys ifaddr */
1400
1401 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1402 {
1403 if (ifp->flags&IFA_F_PERMANENT) {
1404 spin_lock_bh(&ifp->lock);
1405 addrconf_del_timer(ifp);
1406 ifp->flags |= IFA_F_TENTATIVE;
1407 spin_unlock_bh(&ifp->lock);
1408 in6_ifa_put(ifp);
1409 #ifdef CONFIG_IPV6_PRIVACY
1410 } else if (ifp->flags&IFA_F_TEMPORARY) {
1411 struct inet6_ifaddr *ifpub;
1412 spin_lock_bh(&ifp->lock);
1413 ifpub = ifp->ifpub;
1414 if (ifpub) {
1415 in6_ifa_hold(ifpub);
1416 spin_unlock_bh(&ifp->lock);
1417 ipv6_create_tempaddr(ifpub, ifp);
1418 in6_ifa_put(ifpub);
1419 } else {
1420 spin_unlock_bh(&ifp->lock);
1421 }
1422 ipv6_del_addr(ifp);
1423 #endif
1424 } else
1425 ipv6_del_addr(ifp);
1426 }
1427
1428 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1429 {
1430 struct inet6_dev *idev = ifp->idev;
1431 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1432 struct in6_addr addr;
1433
1434 addr.s6_addr32[0] = htonl(0xfe800000);
1435 addr.s6_addr32[1] = 0;
1436
1437 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1438 ipv6_addr_equal(&ifp->addr, &addr)) {
1439 /* DAD failed for link-local based on MAC address */
1440 idev->cnf.disable_ipv6 = 1;
1441 }
1442 }
1443
1444 if (net_ratelimit())
1445 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1446 addrconf_dad_stop(ifp);
1447 }
1448
1449 /* Join to solicited addr multicast group. */
1450
1451 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1452 {
1453 struct in6_addr maddr;
1454
1455 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1456 return;
1457
1458 addrconf_addr_solict_mult(addr, &maddr);
1459 ipv6_dev_mc_inc(dev, &maddr);
1460 }
1461
1462 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1463 {
1464 struct in6_addr maddr;
1465
1466 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1467 return;
1468
1469 addrconf_addr_solict_mult(addr, &maddr);
1470 __ipv6_dev_mc_dec(idev, &maddr);
1471 }
1472
1473 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1474 {
1475 struct in6_addr addr;
1476 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1477 if (ipv6_addr_any(&addr))
1478 return;
1479 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1480 }
1481
1482 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1483 {
1484 struct in6_addr addr;
1485 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1486 if (ipv6_addr_any(&addr))
1487 return;
1488 __ipv6_dev_ac_dec(ifp->idev, &addr);
1489 }
1490
1491 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1492 {
1493 if (dev->addr_len != ETH_ALEN)
1494 return -1;
1495 memcpy(eui, dev->dev_addr, 3);
1496 memcpy(eui + 5, dev->dev_addr + 3, 3);
1497
1498 /*
1499 * The zSeries OSA network cards can be shared among various
1500 * OS instances, but the OSA cards have only one MAC address.
1501 * This leads to duplicate address conflicts in conjunction
1502 * with IPv6 if more than one instance uses the same card.
1503 *
1504 * The driver for these cards can deliver a unique 16-bit
1505 * identifier for each instance sharing the same card. It is
1506 * placed instead of 0xFFFE in the interface identifier. The
1507 * "u" bit of the interface identifier is not inverted in this
1508 * case. Hence the resulting interface identifier has local
1509 * scope according to RFC2373.
1510 */
1511 if (dev->dev_id) {
1512 eui[3] = (dev->dev_id >> 8) & 0xFF;
1513 eui[4] = dev->dev_id & 0xFF;
1514 } else {
1515 eui[3] = 0xFF;
1516 eui[4] = 0xFE;
1517 eui[0] ^= 2;
1518 }
1519 return 0;
1520 }
1521
1522 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1523 {
1524 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1525 if (dev->addr_len != ARCNET_ALEN)
1526 return -1;
1527 memset(eui, 0, 7);
1528 eui[7] = *(u8*)dev->dev_addr;
1529 return 0;
1530 }
1531
1532 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1533 {
1534 if (dev->addr_len != INFINIBAND_ALEN)
1535 return -1;
1536 memcpy(eui, dev->dev_addr + 12, 8);
1537 eui[0] |= 2;
1538 return 0;
1539 }
1540
1541 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1542 {
1543 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1544 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1545 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1546 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1547 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1548 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1549 eui[1] = 0;
1550 eui[2] = 0x5E;
1551 eui[3] = 0xFE;
1552 memcpy(eui + 4, &addr, 4);
1553 return 0;
1554 }
1555 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1556
1557 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1558 {
1559 if (dev->priv_flags & IFF_ISATAP)
1560 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1561 return -1;
1562 }
1563
1564 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1565 {
1566 switch (dev->type) {
1567 case ARPHRD_ETHER:
1568 case ARPHRD_FDDI:
1569 case ARPHRD_IEEE802_TR:
1570 return addrconf_ifid_eui48(eui, dev);
1571 case ARPHRD_ARCNET:
1572 return addrconf_ifid_arcnet(eui, dev);
1573 case ARPHRD_INFINIBAND:
1574 return addrconf_ifid_infiniband(eui, dev);
1575 case ARPHRD_SIT:
1576 return addrconf_ifid_sit(eui, dev);
1577 }
1578 return -1;
1579 }
1580
1581 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1582 {
1583 int err = -1;
1584 struct inet6_ifaddr *ifp;
1585
1586 read_lock_bh(&idev->lock);
1587 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1588 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1589 memcpy(eui, ifp->addr.s6_addr+8, 8);
1590 err = 0;
1591 break;
1592 }
1593 }
1594 read_unlock_bh(&idev->lock);
1595 return err;
1596 }
1597
1598 #ifdef CONFIG_IPV6_PRIVACY
1599 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1600 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1601 {
1602 regen:
1603 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1604 idev->rndid[0] &= ~0x02;
1605
1606 /*
1607 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1608 * check if generated address is not inappropriate
1609 *
1610 * - Reserved subnet anycast (RFC 2526)
1611 * 11111101 11....11 1xxxxxxx
1612 * - ISATAP (RFC4214) 6.1
1613 * 00-00-5E-FE-xx-xx-xx-xx
1614 * - value 0
1615 * - XXX: already assigned to an address on the device
1616 */
1617 if (idev->rndid[0] == 0xfd &&
1618 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1619 (idev->rndid[7]&0x80))
1620 goto regen;
1621 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1622 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1623 goto regen;
1624 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1625 goto regen;
1626 }
1627
1628 return 0;
1629 }
1630
1631 static void ipv6_regen_rndid(unsigned long data)
1632 {
1633 struct inet6_dev *idev = (struct inet6_dev *) data;
1634 unsigned long expires;
1635
1636 rcu_read_lock_bh();
1637 write_lock_bh(&idev->lock);
1638
1639 if (idev->dead)
1640 goto out;
1641
1642 if (__ipv6_regen_rndid(idev) < 0)
1643 goto out;
1644
1645 expires = jiffies +
1646 idev->cnf.temp_prefered_lft * HZ -
1647 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1648 if (time_before(expires, jiffies)) {
1649 printk(KERN_WARNING
1650 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1651 idev->dev->name);
1652 goto out;
1653 }
1654
1655 if (!mod_timer(&idev->regen_timer, expires))
1656 in6_dev_hold(idev);
1657
1658 out:
1659 write_unlock_bh(&idev->lock);
1660 rcu_read_unlock_bh();
1661 in6_dev_put(idev);
1662 }
1663
1664 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1665 int ret = 0;
1666
1667 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1668 ret = __ipv6_regen_rndid(idev);
1669 return ret;
1670 }
1671 #endif
1672
1673 /*
1674 * Add prefix route.
1675 */
1676
1677 static void
1678 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1679 unsigned long expires, u32 flags)
1680 {
1681 struct fib6_config cfg = {
1682 .fc_table = RT6_TABLE_PREFIX,
1683 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1684 .fc_ifindex = dev->ifindex,
1685 .fc_expires = expires,
1686 .fc_dst_len = plen,
1687 .fc_flags = RTF_UP | flags,
1688 .fc_nlinfo.nl_net = dev_net(dev),
1689 };
1690
1691 ipv6_addr_copy(&cfg.fc_dst, pfx);
1692
1693 /* Prevent useless cloning on PtP SIT.
1694 This thing is done here expecting that the whole
1695 class of non-broadcast devices need not cloning.
1696 */
1697 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1698 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1699 cfg.fc_flags |= RTF_NONEXTHOP;
1700 #endif
1701
1702 ip6_route_add(&cfg);
1703 }
1704
1705 /* Create "default" multicast route to the interface */
1706
1707 static void addrconf_add_mroute(struct net_device *dev)
1708 {
1709 struct fib6_config cfg = {
1710 .fc_table = RT6_TABLE_LOCAL,
1711 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1712 .fc_ifindex = dev->ifindex,
1713 .fc_dst_len = 8,
1714 .fc_flags = RTF_UP,
1715 .fc_nlinfo.nl_net = dev_net(dev),
1716 };
1717
1718 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1719
1720 ip6_route_add(&cfg);
1721 }
1722
1723 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1724 static void sit_route_add(struct net_device *dev)
1725 {
1726 struct fib6_config cfg = {
1727 .fc_table = RT6_TABLE_MAIN,
1728 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1729 .fc_ifindex = dev->ifindex,
1730 .fc_dst_len = 96,
1731 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1732 .fc_nlinfo.nl_net = dev_net(dev),
1733 };
1734
1735 /* prefix length - 96 bits "::d.d.d.d" */
1736 ip6_route_add(&cfg);
1737 }
1738 #endif
1739
1740 static void addrconf_add_lroute(struct net_device *dev)
1741 {
1742 struct in6_addr addr;
1743
1744 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1745 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1746 }
1747
1748 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1749 {
1750 struct inet6_dev *idev;
1751
1752 ASSERT_RTNL();
1753
1754 if ((idev = ipv6_find_idev(dev)) == NULL)
1755 return NULL;
1756
1757 /* Add default multicast route */
1758 addrconf_add_mroute(dev);
1759
1760 /* Add link local route */
1761 addrconf_add_lroute(dev);
1762 return idev;
1763 }
1764
1765 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1766 {
1767 struct prefix_info *pinfo;
1768 __u32 valid_lft;
1769 __u32 prefered_lft;
1770 int addr_type;
1771 struct inet6_dev *in6_dev;
1772
1773 pinfo = (struct prefix_info *) opt;
1774
1775 if (len < sizeof(struct prefix_info)) {
1776 ADBG(("addrconf: prefix option too short\n"));
1777 return;
1778 }
1779
1780 /*
1781 * Validation checks ([ADDRCONF], page 19)
1782 */
1783
1784 addr_type = ipv6_addr_type(&pinfo->prefix);
1785
1786 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1787 return;
1788
1789 valid_lft = ntohl(pinfo->valid);
1790 prefered_lft = ntohl(pinfo->prefered);
1791
1792 if (prefered_lft > valid_lft) {
1793 if (net_ratelimit())
1794 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1795 return;
1796 }
1797
1798 in6_dev = in6_dev_get(dev);
1799
1800 if (in6_dev == NULL) {
1801 if (net_ratelimit())
1802 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1803 return;
1804 }
1805
1806 /*
1807 * Two things going on here:
1808 * 1) Add routes for on-link prefixes
1809 * 2) Configure prefixes with the auto flag set
1810 */
1811
1812 if (pinfo->onlink) {
1813 struct rt6_info *rt;
1814 unsigned long rt_expires;
1815
1816 /* Avoid arithmetic overflow. Really, we could
1817 * save rt_expires in seconds, likely valid_lft,
1818 * but it would require division in fib gc, that it
1819 * not good.
1820 */
1821 if (HZ > USER_HZ)
1822 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1823 else
1824 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1825
1826 if (addrconf_finite_timeout(rt_expires))
1827 rt_expires *= HZ;
1828
1829 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
1830 dev->ifindex, 1);
1831
1832 if (rt && addrconf_is_prefix_route(rt)) {
1833 /* Autoconf prefix route */
1834 if (valid_lft == 0) {
1835 ip6_del_rt(rt);
1836 rt = NULL;
1837 } else if (addrconf_finite_timeout(rt_expires)) {
1838 /* not infinity */
1839 rt->rt6i_expires = jiffies + rt_expires;
1840 rt->rt6i_flags |= RTF_EXPIRES;
1841 } else {
1842 rt->rt6i_flags &= ~RTF_EXPIRES;
1843 rt->rt6i_expires = 0;
1844 }
1845 } else if (valid_lft) {
1846 clock_t expires = 0;
1847 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1848 if (addrconf_finite_timeout(rt_expires)) {
1849 /* not infinity */
1850 flags |= RTF_EXPIRES;
1851 expires = jiffies_to_clock_t(rt_expires);
1852 }
1853 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1854 dev, expires, flags);
1855 }
1856 if (rt)
1857 dst_release(&rt->u.dst);
1858 }
1859
1860 /* Try to figure out our local address for this prefix */
1861
1862 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1863 struct inet6_ifaddr * ifp;
1864 struct in6_addr addr;
1865 int create = 0, update_lft = 0;
1866
1867 if (pinfo->prefix_len == 64) {
1868 memcpy(&addr, &pinfo->prefix, 8);
1869 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1870 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1871 in6_dev_put(in6_dev);
1872 return;
1873 }
1874 goto ok;
1875 }
1876 if (net_ratelimit())
1877 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1878 pinfo->prefix_len);
1879 in6_dev_put(in6_dev);
1880 return;
1881
1882 ok:
1883
1884 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1);
1885
1886 if (ifp == NULL && valid_lft) {
1887 int max_addresses = in6_dev->cnf.max_addresses;
1888 u32 addr_flags = 0;
1889
1890 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1891 if (in6_dev->cnf.optimistic_dad &&
1892 !ipv6_devconf.forwarding)
1893 addr_flags = IFA_F_OPTIMISTIC;
1894 #endif
1895
1896 /* Do not allow to create too much of autoconfigured
1897 * addresses; this would be too easy way to crash kernel.
1898 */
1899 if (!max_addresses ||
1900 ipv6_count_addresses(in6_dev) < max_addresses)
1901 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1902 addr_type&IPV6_ADDR_SCOPE_MASK,
1903 addr_flags);
1904
1905 if (!ifp || IS_ERR(ifp)) {
1906 in6_dev_put(in6_dev);
1907 return;
1908 }
1909
1910 update_lft = create = 1;
1911 ifp->cstamp = jiffies;
1912 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1913 }
1914
1915 if (ifp) {
1916 int flags;
1917 unsigned long now;
1918 #ifdef CONFIG_IPV6_PRIVACY
1919 struct inet6_ifaddr *ift;
1920 #endif
1921 u32 stored_lft;
1922
1923 /* update lifetime (RFC2462 5.5.3 e) */
1924 spin_lock(&ifp->lock);
1925 now = jiffies;
1926 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1927 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1928 else
1929 stored_lft = 0;
1930 if (!update_lft && stored_lft) {
1931 if (valid_lft > MIN_VALID_LIFETIME ||
1932 valid_lft > stored_lft)
1933 update_lft = 1;
1934 else if (stored_lft <= MIN_VALID_LIFETIME) {
1935 /* valid_lft <= stored_lft is always true */
1936 /* XXX: IPsec */
1937 update_lft = 0;
1938 } else {
1939 valid_lft = MIN_VALID_LIFETIME;
1940 if (valid_lft < prefered_lft)
1941 prefered_lft = valid_lft;
1942 update_lft = 1;
1943 }
1944 }
1945
1946 if (update_lft) {
1947 ifp->valid_lft = valid_lft;
1948 ifp->prefered_lft = prefered_lft;
1949 ifp->tstamp = now;
1950 flags = ifp->flags;
1951 ifp->flags &= ~IFA_F_DEPRECATED;
1952 spin_unlock(&ifp->lock);
1953
1954 if (!(flags&IFA_F_TENTATIVE))
1955 ipv6_ifa_notify(0, ifp);
1956 } else
1957 spin_unlock(&ifp->lock);
1958
1959 #ifdef CONFIG_IPV6_PRIVACY
1960 read_lock_bh(&in6_dev->lock);
1961 /* update all temporary addresses in the list */
1962 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1963 /*
1964 * When adjusting the lifetimes of an existing
1965 * temporary address, only lower the lifetimes.
1966 * Implementations must not increase the
1967 * lifetimes of an existing temporary address
1968 * when processing a Prefix Information Option.
1969 */
1970 if (ifp != ift->ifpub)
1971 continue;
1972
1973 spin_lock(&ift->lock);
1974 flags = ift->flags;
1975 if (ift->valid_lft > valid_lft &&
1976 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1977 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1978 if (ift->prefered_lft > prefered_lft &&
1979 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1980 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1981 spin_unlock(&ift->lock);
1982 if (!(flags&IFA_F_TENTATIVE))
1983 ipv6_ifa_notify(0, ift);
1984 }
1985
1986 if (create && in6_dev->cnf.use_tempaddr > 0) {
1987 /*
1988 * When a new public address is created as described in [ADDRCONF],
1989 * also create a new temporary address.
1990 */
1991 read_unlock_bh(&in6_dev->lock);
1992 ipv6_create_tempaddr(ifp, NULL);
1993 } else {
1994 read_unlock_bh(&in6_dev->lock);
1995 }
1996 #endif
1997 in6_ifa_put(ifp);
1998 addrconf_verify(0);
1999 }
2000 }
2001 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2002 in6_dev_put(in6_dev);
2003 }
2004
2005 /*
2006 * Set destination address.
2007 * Special case for SIT interfaces where we create a new "virtual"
2008 * device.
2009 */
2010 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2011 {
2012 struct in6_ifreq ireq;
2013 struct net_device *dev;
2014 int err = -EINVAL;
2015
2016 rtnl_lock();
2017
2018 err = -EFAULT;
2019 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2020 goto err_exit;
2021
2022 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2023
2024 err = -ENODEV;
2025 if (dev == NULL)
2026 goto err_exit;
2027
2028 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2029 if (dev->type == ARPHRD_SIT) {
2030 struct ifreq ifr;
2031 mm_segment_t oldfs;
2032 struct ip_tunnel_parm p;
2033
2034 err = -EADDRNOTAVAIL;
2035 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2036 goto err_exit;
2037
2038 memset(&p, 0, sizeof(p));
2039 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2040 p.iph.saddr = 0;
2041 p.iph.version = 4;
2042 p.iph.ihl = 5;
2043 p.iph.protocol = IPPROTO_IPV6;
2044 p.iph.ttl = 64;
2045 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2046
2047 oldfs = get_fs(); set_fs(KERNEL_DS);
2048 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2049 set_fs(oldfs);
2050
2051 if (err == 0) {
2052 err = -ENOBUFS;
2053 dev = __dev_get_by_name(net, p.name);
2054 if (!dev)
2055 goto err_exit;
2056 err = dev_open(dev);
2057 }
2058 }
2059 #endif
2060
2061 err_exit:
2062 rtnl_unlock();
2063 return err;
2064 }
2065
2066 /*
2067 * Manual configuration of address on an interface
2068 */
2069 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2070 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2071 __u32 valid_lft)
2072 {
2073 struct inet6_ifaddr *ifp;
2074 struct inet6_dev *idev;
2075 struct net_device *dev;
2076 int scope;
2077 u32 flags;
2078 clock_t expires;
2079 unsigned long timeout;
2080
2081 ASSERT_RTNL();
2082
2083 if (plen > 128)
2084 return -EINVAL;
2085
2086 /* check the lifetime */
2087 if (!valid_lft || prefered_lft > valid_lft)
2088 return -EINVAL;
2089
2090 dev = __dev_get_by_index(net, ifindex);
2091 if (!dev)
2092 return -ENODEV;
2093
2094 if ((idev = addrconf_add_dev(dev)) == NULL)
2095 return -ENOBUFS;
2096
2097 scope = ipv6_addr_scope(pfx);
2098
2099 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2100 if (addrconf_finite_timeout(timeout)) {
2101 expires = jiffies_to_clock_t(timeout * HZ);
2102 valid_lft = timeout;
2103 flags = RTF_EXPIRES;
2104 } else {
2105 expires = 0;
2106 flags = 0;
2107 ifa_flags |= IFA_F_PERMANENT;
2108 }
2109
2110 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2111 if (addrconf_finite_timeout(timeout)) {
2112 if (timeout == 0)
2113 ifa_flags |= IFA_F_DEPRECATED;
2114 prefered_lft = timeout;
2115 }
2116
2117 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2118
2119 if (!IS_ERR(ifp)) {
2120 spin_lock_bh(&ifp->lock);
2121 ifp->valid_lft = valid_lft;
2122 ifp->prefered_lft = prefered_lft;
2123 ifp->tstamp = jiffies;
2124 spin_unlock_bh(&ifp->lock);
2125
2126 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2127 expires, flags);
2128 /*
2129 * Note that section 3.1 of RFC 4429 indicates
2130 * that the Optimistic flag should not be set for
2131 * manually configured addresses
2132 */
2133 addrconf_dad_start(ifp, 0);
2134 in6_ifa_put(ifp);
2135 addrconf_verify(0);
2136 return 0;
2137 }
2138
2139 return PTR_ERR(ifp);
2140 }
2141
2142 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2143 unsigned int plen)
2144 {
2145 struct inet6_ifaddr *ifp;
2146 struct inet6_dev *idev;
2147 struct net_device *dev;
2148
2149 if (plen > 128)
2150 return -EINVAL;
2151
2152 dev = __dev_get_by_index(net, ifindex);
2153 if (!dev)
2154 return -ENODEV;
2155
2156 if ((idev = __in6_dev_get(dev)) == NULL)
2157 return -ENXIO;
2158
2159 read_lock_bh(&idev->lock);
2160 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2161 if (ifp->prefix_len == plen &&
2162 ipv6_addr_equal(pfx, &ifp->addr)) {
2163 in6_ifa_hold(ifp);
2164 read_unlock_bh(&idev->lock);
2165
2166 ipv6_del_addr(ifp);
2167
2168 /* If the last address is deleted administratively,
2169 disable IPv6 on this interface.
2170 */
2171 if (idev->addr_list == NULL)
2172 addrconf_ifdown(idev->dev, 1);
2173 return 0;
2174 }
2175 }
2176 read_unlock_bh(&idev->lock);
2177 return -EADDRNOTAVAIL;
2178 }
2179
2180
2181 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2182 {
2183 struct in6_ifreq ireq;
2184 int err;
2185
2186 if (!capable(CAP_NET_ADMIN))
2187 return -EPERM;
2188
2189 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2190 return -EFAULT;
2191
2192 rtnl_lock();
2193 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2194 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2195 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2196 rtnl_unlock();
2197 return err;
2198 }
2199
2200 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2201 {
2202 struct in6_ifreq ireq;
2203 int err;
2204
2205 if (!capable(CAP_NET_ADMIN))
2206 return -EPERM;
2207
2208 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2209 return -EFAULT;
2210
2211 rtnl_lock();
2212 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2213 ireq.ifr6_prefixlen);
2214 rtnl_unlock();
2215 return err;
2216 }
2217
2218 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2219 static void sit_add_v4_addrs(struct inet6_dev *idev)
2220 {
2221 struct inet6_ifaddr * ifp;
2222 struct in6_addr addr;
2223 struct net_device *dev;
2224 struct net *net = dev_net(idev->dev);
2225 int scope;
2226
2227 ASSERT_RTNL();
2228
2229 memset(&addr, 0, sizeof(struct in6_addr));
2230 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2231
2232 if (idev->dev->flags&IFF_POINTOPOINT) {
2233 addr.s6_addr32[0] = htonl(0xfe800000);
2234 scope = IFA_LINK;
2235 } else {
2236 scope = IPV6_ADDR_COMPATv4;
2237 }
2238
2239 if (addr.s6_addr32[3]) {
2240 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2241 if (!IS_ERR(ifp)) {
2242 spin_lock_bh(&ifp->lock);
2243 ifp->flags &= ~IFA_F_TENTATIVE;
2244 spin_unlock_bh(&ifp->lock);
2245 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2246 in6_ifa_put(ifp);
2247 }
2248 return;
2249 }
2250
2251 for_each_netdev(net, dev) {
2252 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2253 if (in_dev && (dev->flags & IFF_UP)) {
2254 struct in_ifaddr * ifa;
2255
2256 int flag = scope;
2257
2258 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2259 int plen;
2260
2261 addr.s6_addr32[3] = ifa->ifa_local;
2262
2263 if (ifa->ifa_scope == RT_SCOPE_LINK)
2264 continue;
2265 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2266 if (idev->dev->flags&IFF_POINTOPOINT)
2267 continue;
2268 flag |= IFA_HOST;
2269 }
2270 if (idev->dev->flags&IFF_POINTOPOINT)
2271 plen = 64;
2272 else
2273 plen = 96;
2274
2275 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2276 IFA_F_PERMANENT);
2277 if (!IS_ERR(ifp)) {
2278 spin_lock_bh(&ifp->lock);
2279 ifp->flags &= ~IFA_F_TENTATIVE;
2280 spin_unlock_bh(&ifp->lock);
2281 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2282 in6_ifa_put(ifp);
2283 }
2284 }
2285 }
2286 }
2287 }
2288 #endif
2289
2290 static void init_loopback(struct net_device *dev)
2291 {
2292 struct inet6_dev *idev;
2293 struct inet6_ifaddr * ifp;
2294
2295 /* ::1 */
2296
2297 ASSERT_RTNL();
2298
2299 if ((idev = ipv6_find_idev(dev)) == NULL) {
2300 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2301 return;
2302 }
2303
2304 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2305 if (!IS_ERR(ifp)) {
2306 spin_lock_bh(&ifp->lock);
2307 ifp->flags &= ~IFA_F_TENTATIVE;
2308 spin_unlock_bh(&ifp->lock);
2309 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2310 in6_ifa_put(ifp);
2311 }
2312 }
2313
2314 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2315 {
2316 struct inet6_ifaddr * ifp;
2317 u32 addr_flags = IFA_F_PERMANENT;
2318
2319 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2320 if (idev->cnf.optimistic_dad &&
2321 !ipv6_devconf.forwarding)
2322 addr_flags |= IFA_F_OPTIMISTIC;
2323 #endif
2324
2325
2326 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2327 if (!IS_ERR(ifp)) {
2328 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2329 addrconf_dad_start(ifp, 0);
2330 in6_ifa_put(ifp);
2331 }
2332 }
2333
2334 static void addrconf_dev_config(struct net_device *dev)
2335 {
2336 struct in6_addr addr;
2337 struct inet6_dev * idev;
2338
2339 ASSERT_RTNL();
2340
2341 if ((dev->type != ARPHRD_ETHER) &&
2342 (dev->type != ARPHRD_FDDI) &&
2343 (dev->type != ARPHRD_IEEE802_TR) &&
2344 (dev->type != ARPHRD_ARCNET) &&
2345 (dev->type != ARPHRD_INFINIBAND)) {
2346 /* Alas, we support only Ethernet autoconfiguration. */
2347 return;
2348 }
2349
2350 idev = addrconf_add_dev(dev);
2351 if (idev == NULL)
2352 return;
2353
2354 memset(&addr, 0, sizeof(struct in6_addr));
2355 addr.s6_addr32[0] = htonl(0xFE800000);
2356
2357 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2358 addrconf_add_linklocal(idev, &addr);
2359 }
2360
2361 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2362 static void addrconf_sit_config(struct net_device *dev)
2363 {
2364 struct inet6_dev *idev;
2365
2366 ASSERT_RTNL();
2367
2368 /*
2369 * Configure the tunnel with one of our IPv4
2370 * addresses... we should configure all of
2371 * our v4 addrs in the tunnel
2372 */
2373
2374 if ((idev = ipv6_find_idev(dev)) == NULL) {
2375 printk(KERN_DEBUG "init sit: add_dev failed\n");
2376 return;
2377 }
2378
2379 if (dev->priv_flags & IFF_ISATAP) {
2380 struct in6_addr addr;
2381
2382 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2383 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2384 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2385 addrconf_add_linklocal(idev, &addr);
2386 return;
2387 }
2388
2389 sit_add_v4_addrs(idev);
2390
2391 if (dev->flags&IFF_POINTOPOINT) {
2392 addrconf_add_mroute(dev);
2393 addrconf_add_lroute(dev);
2394 } else
2395 sit_route_add(dev);
2396 }
2397 #endif
2398
2399 static inline int
2400 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2401 {
2402 struct in6_addr lladdr;
2403
2404 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2405 addrconf_add_linklocal(idev, &lladdr);
2406 return 0;
2407 }
2408 return -1;
2409 }
2410
2411 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2412 {
2413 struct net_device *link_dev;
2414 struct net *net = dev_net(idev->dev);
2415
2416 /* first try to inherit the link-local address from the link device */
2417 if (idev->dev->iflink &&
2418 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2419 if (!ipv6_inherit_linklocal(idev, link_dev))
2420 return;
2421 }
2422 /* then try to inherit it from any device */
2423 for_each_netdev(net, link_dev) {
2424 if (!ipv6_inherit_linklocal(idev, link_dev))
2425 return;
2426 }
2427 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2428 }
2429
2430 /*
2431 * Autoconfigure tunnel with a link-local address so routing protocols,
2432 * DHCPv6, MLD etc. can be run over the virtual link
2433 */
2434
2435 static void addrconf_ip6_tnl_config(struct net_device *dev)
2436 {
2437 struct inet6_dev *idev;
2438
2439 ASSERT_RTNL();
2440
2441 if ((idev = addrconf_add_dev(dev)) == NULL) {
2442 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2443 return;
2444 }
2445 ip6_tnl_add_linklocal(idev);
2446 }
2447
2448 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2449 void * data)
2450 {
2451 struct net_device *dev = (struct net_device *) data;
2452 struct inet6_dev *idev = __in6_dev_get(dev);
2453 int run_pending = 0;
2454 int err;
2455
2456 switch(event) {
2457 case NETDEV_REGISTER:
2458 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2459 idev = ipv6_add_dev(dev);
2460 if (!idev)
2461 return notifier_from_errno(-ENOMEM);
2462 }
2463 break;
2464 case NETDEV_UP:
2465 case NETDEV_CHANGE:
2466 if (dev->flags & IFF_SLAVE)
2467 break;
2468
2469 if (event == NETDEV_UP) {
2470 if (!addrconf_qdisc_ok(dev)) {
2471 /* device is not ready yet. */
2472 printk(KERN_INFO
2473 "ADDRCONF(NETDEV_UP): %s: "
2474 "link is not ready\n",
2475 dev->name);
2476 break;
2477 }
2478
2479 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2480 idev = ipv6_add_dev(dev);
2481
2482 if (idev)
2483 idev->if_flags |= IF_READY;
2484 } else {
2485 if (!addrconf_qdisc_ok(dev)) {
2486 /* device is still not ready. */
2487 break;
2488 }
2489
2490 if (idev) {
2491 if (idev->if_flags & IF_READY) {
2492 /* device is already configured. */
2493 break;
2494 }
2495 idev->if_flags |= IF_READY;
2496 }
2497
2498 printk(KERN_INFO
2499 "ADDRCONF(NETDEV_CHANGE): %s: "
2500 "link becomes ready\n",
2501 dev->name);
2502
2503 run_pending = 1;
2504 }
2505
2506 switch(dev->type) {
2507 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2508 case ARPHRD_SIT:
2509 addrconf_sit_config(dev);
2510 break;
2511 #endif
2512 case ARPHRD_TUNNEL6:
2513 addrconf_ip6_tnl_config(dev);
2514 break;
2515 case ARPHRD_LOOPBACK:
2516 init_loopback(dev);
2517 break;
2518
2519 default:
2520 addrconf_dev_config(dev);
2521 break;
2522 }
2523 if (idev) {
2524 if (run_pending)
2525 addrconf_dad_run(idev);
2526
2527 /* If the MTU changed during the interface down, when the
2528 interface up, the changed MTU must be reflected in the
2529 idev as well as routers.
2530 */
2531 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2532 rt6_mtu_change(dev, dev->mtu);
2533 idev->cnf.mtu6 = dev->mtu;
2534 }
2535 idev->tstamp = jiffies;
2536 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2537 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2538 stop IPv6 on this interface.
2539 */
2540 if (dev->mtu < IPV6_MIN_MTU)
2541 addrconf_ifdown(dev, event != NETDEV_DOWN);
2542 }
2543 break;
2544
2545 case NETDEV_CHANGEMTU:
2546 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2547 rt6_mtu_change(dev, dev->mtu);
2548 idev->cnf.mtu6 = dev->mtu;
2549 break;
2550 }
2551
2552 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2553 idev = ipv6_add_dev(dev);
2554 if (idev)
2555 break;
2556 }
2557
2558 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2559
2560 case NETDEV_DOWN:
2561 case NETDEV_UNREGISTER:
2562 /*
2563 * Remove all addresses from this interface.
2564 */
2565 addrconf_ifdown(dev, event != NETDEV_DOWN);
2566 break;
2567
2568 case NETDEV_CHANGENAME:
2569 if (idev) {
2570 snmp6_unregister_dev(idev);
2571 addrconf_sysctl_unregister(idev);
2572 addrconf_sysctl_register(idev);
2573 err = snmp6_register_dev(idev);
2574 if (err)
2575 return notifier_from_errno(err);
2576 }
2577 break;
2578 }
2579
2580 return NOTIFY_OK;
2581 }
2582
2583 /*
2584 * addrconf module should be notified of a device going up
2585 */
2586 static struct notifier_block ipv6_dev_notf = {
2587 .notifier_call = addrconf_notify,
2588 .priority = 0
2589 };
2590
2591 static int addrconf_ifdown(struct net_device *dev, int how)
2592 {
2593 struct inet6_dev *idev;
2594 struct inet6_ifaddr *ifa, **bifa;
2595 struct net *net = dev_net(dev);
2596 int i;
2597
2598 ASSERT_RTNL();
2599
2600 if ((dev->flags & IFF_LOOPBACK) && how == 1)
2601 how = 0;
2602
2603 rt6_ifdown(net, dev);
2604 neigh_ifdown(&nd_tbl, dev);
2605
2606 idev = __in6_dev_get(dev);
2607 if (idev == NULL)
2608 return -ENODEV;
2609
2610 /* Step 1: remove reference to ipv6 device from parent device.
2611 Do not dev_put!
2612 */
2613 if (how) {
2614 idev->dead = 1;
2615
2616 /* protected by rtnl_lock */
2617 rcu_assign_pointer(dev->ip6_ptr, NULL);
2618
2619 /* Step 1.5: remove snmp6 entry */
2620 snmp6_unregister_dev(idev);
2621
2622 }
2623
2624 /* Step 2: clear hash table */
2625 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2626 bifa = &inet6_addr_lst[i];
2627
2628 write_lock_bh(&addrconf_hash_lock);
2629 while ((ifa = *bifa) != NULL) {
2630 if (ifa->idev == idev) {
2631 *bifa = ifa->lst_next;
2632 ifa->lst_next = NULL;
2633 addrconf_del_timer(ifa);
2634 in6_ifa_put(ifa);
2635 continue;
2636 }
2637 bifa = &ifa->lst_next;
2638 }
2639 write_unlock_bh(&addrconf_hash_lock);
2640 }
2641
2642 write_lock_bh(&idev->lock);
2643
2644 /* Step 3: clear flags for stateless addrconf */
2645 if (!how)
2646 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2647
2648 /* Step 4: clear address list */
2649 #ifdef CONFIG_IPV6_PRIVACY
2650 if (how && del_timer(&idev->regen_timer))
2651 in6_dev_put(idev);
2652
2653 /* clear tempaddr list */
2654 while ((ifa = idev->tempaddr_list) != NULL) {
2655 idev->tempaddr_list = ifa->tmp_next;
2656 ifa->tmp_next = NULL;
2657 ifa->dead = 1;
2658 write_unlock_bh(&idev->lock);
2659 spin_lock_bh(&ifa->lock);
2660
2661 if (ifa->ifpub) {
2662 in6_ifa_put(ifa->ifpub);
2663 ifa->ifpub = NULL;
2664 }
2665 spin_unlock_bh(&ifa->lock);
2666 in6_ifa_put(ifa);
2667 write_lock_bh(&idev->lock);
2668 }
2669 #endif
2670 while ((ifa = idev->addr_list) != NULL) {
2671 idev->addr_list = ifa->if_next;
2672 ifa->if_next = NULL;
2673 ifa->dead = 1;
2674 addrconf_del_timer(ifa);
2675 write_unlock_bh(&idev->lock);
2676
2677 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2678 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2679 in6_ifa_put(ifa);
2680
2681 write_lock_bh(&idev->lock);
2682 }
2683 write_unlock_bh(&idev->lock);
2684
2685 /* Step 5: Discard multicast list */
2686
2687 if (how)
2688 ipv6_mc_destroy_dev(idev);
2689 else
2690 ipv6_mc_down(idev);
2691
2692 idev->tstamp = jiffies;
2693
2694 /* Shot the device (if unregistered) */
2695
2696 if (how) {
2697 addrconf_sysctl_unregister(idev);
2698 neigh_parms_release(&nd_tbl, idev->nd_parms);
2699 neigh_ifdown(&nd_tbl, dev);
2700 in6_dev_put(idev);
2701 }
2702 return 0;
2703 }
2704
2705 static void addrconf_rs_timer(unsigned long data)
2706 {
2707 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2708
2709 if (ifp->idev->cnf.forwarding)
2710 goto out;
2711
2712 if (ifp->idev->if_flags & IF_RA_RCVD) {
2713 /*
2714 * Announcement received after solicitation
2715 * was sent
2716 */
2717 goto out;
2718 }
2719
2720 spin_lock(&ifp->lock);
2721 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2722 /* The wait after the last probe can be shorter */
2723 addrconf_mod_timer(ifp, AC_RS,
2724 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2725 ifp->idev->cnf.rtr_solicit_delay :
2726 ifp->idev->cnf.rtr_solicit_interval);
2727 spin_unlock(&ifp->lock);
2728
2729 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2730 } else {
2731 spin_unlock(&ifp->lock);
2732 /*
2733 * Note: we do not support deprecated "all on-link"
2734 * assumption any longer.
2735 */
2736 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2737 ifp->idev->dev->name);
2738 }
2739
2740 out:
2741 in6_ifa_put(ifp);
2742 }
2743
2744 /*
2745 * Duplicate Address Detection
2746 */
2747 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2748 {
2749 unsigned long rand_num;
2750 struct inet6_dev *idev = ifp->idev;
2751
2752 if (ifp->flags & IFA_F_OPTIMISTIC)
2753 rand_num = 0;
2754 else
2755 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2756
2757 ifp->probes = idev->cnf.dad_transmits;
2758 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2759 }
2760
2761 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2762 {
2763 struct inet6_dev *idev = ifp->idev;
2764 struct net_device *dev = idev->dev;
2765
2766 addrconf_join_solict(dev, &ifp->addr);
2767
2768 net_srandom(ifp->addr.s6_addr32[3]);
2769
2770 read_lock_bh(&idev->lock);
2771 if (ifp->dead)
2772 goto out;
2773 spin_lock_bh(&ifp->lock);
2774
2775 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2776 idev->cnf.accept_dad < 1 ||
2777 !(ifp->flags&IFA_F_TENTATIVE) ||
2778 ifp->flags & IFA_F_NODAD) {
2779 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2780 spin_unlock_bh(&ifp->lock);
2781 read_unlock_bh(&idev->lock);
2782
2783 addrconf_dad_completed(ifp);
2784 return;
2785 }
2786
2787 if (!(idev->if_flags & IF_READY)) {
2788 spin_unlock_bh(&ifp->lock);
2789 read_unlock_bh(&idev->lock);
2790 /*
2791 * If the defice is not ready:
2792 * - keep it tentative if it is a permanent address.
2793 * - otherwise, kill it.
2794 */
2795 in6_ifa_hold(ifp);
2796 addrconf_dad_stop(ifp);
2797 return;
2798 }
2799
2800 /*
2801 * Optimistic nodes can start receiving
2802 * Frames right away
2803 */
2804 if(ifp->flags & IFA_F_OPTIMISTIC)
2805 ip6_ins_rt(ifp->rt);
2806
2807 addrconf_dad_kick(ifp);
2808 spin_unlock_bh(&ifp->lock);
2809 out:
2810 read_unlock_bh(&idev->lock);
2811 }
2812
2813 static void addrconf_dad_timer(unsigned long data)
2814 {
2815 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2816 struct inet6_dev *idev = ifp->idev;
2817 struct in6_addr mcaddr;
2818
2819 read_lock_bh(&idev->lock);
2820 if (idev->dead) {
2821 read_unlock_bh(&idev->lock);
2822 goto out;
2823 }
2824 if (idev->cnf.accept_dad > 1 && idev->cnf.disable_ipv6) {
2825 read_unlock_bh(&idev->lock);
2826 addrconf_dad_failure(ifp);
2827 return;
2828 }
2829 spin_lock_bh(&ifp->lock);
2830 if (ifp->probes == 0) {
2831 /*
2832 * DAD was successful
2833 */
2834
2835 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2836 spin_unlock_bh(&ifp->lock);
2837 read_unlock_bh(&idev->lock);
2838
2839 addrconf_dad_completed(ifp);
2840
2841 goto out;
2842 }
2843
2844 ifp->probes--;
2845 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2846 spin_unlock_bh(&ifp->lock);
2847 read_unlock_bh(&idev->lock);
2848
2849 /* send a neighbour solicitation for our addr */
2850 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2851 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2852 out:
2853 in6_ifa_put(ifp);
2854 }
2855
2856 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2857 {
2858 struct net_device * dev = ifp->idev->dev;
2859
2860 /*
2861 * Configure the address for reception. Now it is valid.
2862 */
2863
2864 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2865
2866 /* If added prefix is link local and forwarding is off,
2867 start sending router solicitations.
2868 */
2869
2870 if (ifp->idev->cnf.forwarding == 0 &&
2871 ifp->idev->cnf.rtr_solicits > 0 &&
2872 (dev->flags&IFF_LOOPBACK) == 0 &&
2873 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2874 /*
2875 * If a host as already performed a random delay
2876 * [...] as part of DAD [...] there is no need
2877 * to delay again before sending the first RS
2878 */
2879 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2880
2881 spin_lock_bh(&ifp->lock);
2882 ifp->probes = 1;
2883 ifp->idev->if_flags |= IF_RS_SENT;
2884 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2885 spin_unlock_bh(&ifp->lock);
2886 }
2887 }
2888
2889 static void addrconf_dad_run(struct inet6_dev *idev) {
2890 struct inet6_ifaddr *ifp;
2891
2892 read_lock_bh(&idev->lock);
2893 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2894 spin_lock_bh(&ifp->lock);
2895 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2896 spin_unlock_bh(&ifp->lock);
2897 continue;
2898 }
2899 spin_unlock_bh(&ifp->lock);
2900 addrconf_dad_kick(ifp);
2901 }
2902 read_unlock_bh(&idev->lock);
2903 }
2904
2905 #ifdef CONFIG_PROC_FS
2906 struct if6_iter_state {
2907 struct seq_net_private p;
2908 int bucket;
2909 };
2910
2911 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2912 {
2913 struct inet6_ifaddr *ifa = NULL;
2914 struct if6_iter_state *state = seq->private;
2915 struct net *net = seq_file_net(seq);
2916
2917 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2918 ifa = inet6_addr_lst[state->bucket];
2919
2920 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2921 ifa = ifa->lst_next;
2922 if (ifa)
2923 break;
2924 }
2925 return ifa;
2926 }
2927
2928 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2929 {
2930 struct if6_iter_state *state = seq->private;
2931 struct net *net = seq_file_net(seq);
2932
2933 ifa = ifa->lst_next;
2934 try_again:
2935 if (ifa) {
2936 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2937 ifa = ifa->lst_next;
2938 goto try_again;
2939 }
2940 }
2941
2942 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2943 ifa = inet6_addr_lst[state->bucket];
2944 goto try_again;
2945 }
2946
2947 return ifa;
2948 }
2949
2950 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2951 {
2952 struct inet6_ifaddr *ifa = if6_get_first(seq);
2953
2954 if (ifa)
2955 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2956 --pos;
2957 return pos ? NULL : ifa;
2958 }
2959
2960 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2961 __acquires(addrconf_hash_lock)
2962 {
2963 read_lock_bh(&addrconf_hash_lock);
2964 return if6_get_idx(seq, *pos);
2965 }
2966
2967 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2968 {
2969 struct inet6_ifaddr *ifa;
2970
2971 ifa = if6_get_next(seq, v);
2972 ++*pos;
2973 return ifa;
2974 }
2975
2976 static void if6_seq_stop(struct seq_file *seq, void *v)
2977 __releases(addrconf_hash_lock)
2978 {
2979 read_unlock_bh(&addrconf_hash_lock);
2980 }
2981
2982 static int if6_seq_show(struct seq_file *seq, void *v)
2983 {
2984 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2985 seq_printf(seq,
2986 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2987 NIP6(ifp->addr),
2988 ifp->idev->dev->ifindex,
2989 ifp->prefix_len,
2990 ifp->scope,
2991 ifp->flags,
2992 ifp->idev->dev->name);
2993 return 0;
2994 }
2995
2996 static const struct seq_operations if6_seq_ops = {
2997 .start = if6_seq_start,
2998 .next = if6_seq_next,
2999 .show = if6_seq_show,
3000 .stop = if6_seq_stop,
3001 };
3002
3003 static int if6_seq_open(struct inode *inode, struct file *file)
3004 {
3005 return seq_open_net(inode, file, &if6_seq_ops,
3006 sizeof(struct if6_iter_state));
3007 }
3008
3009 static const struct file_operations if6_fops = {
3010 .owner = THIS_MODULE,
3011 .open = if6_seq_open,
3012 .read = seq_read,
3013 .llseek = seq_lseek,
3014 .release = seq_release_net,
3015 };
3016
3017 static int if6_proc_net_init(struct net *net)
3018 {
3019 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3020 return -ENOMEM;
3021 return 0;
3022 }
3023
3024 static void if6_proc_net_exit(struct net *net)
3025 {
3026 proc_net_remove(net, "if_inet6");
3027 }
3028
3029 static struct pernet_operations if6_proc_net_ops = {
3030 .init = if6_proc_net_init,
3031 .exit = if6_proc_net_exit,
3032 };
3033
3034 int __init if6_proc_init(void)
3035 {
3036 return register_pernet_subsys(&if6_proc_net_ops);
3037 }
3038
3039 void if6_proc_exit(void)
3040 {
3041 unregister_pernet_subsys(&if6_proc_net_ops);
3042 }
3043 #endif /* CONFIG_PROC_FS */
3044
3045 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3046 /* Check if address is a home address configured on any interface. */
3047 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3048 {
3049 int ret = 0;
3050 struct inet6_ifaddr * ifp;
3051 u8 hash = ipv6_addr_hash(addr);
3052 read_lock_bh(&addrconf_hash_lock);
3053 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3054 if (!net_eq(dev_net(ifp->idev->dev), net))
3055 continue;
3056 if (ipv6_addr_equal(&ifp->addr, addr) &&
3057 (ifp->flags & IFA_F_HOMEADDRESS)) {
3058 ret = 1;
3059 break;
3060 }
3061 }
3062 read_unlock_bh(&addrconf_hash_lock);
3063 return ret;
3064 }
3065 #endif
3066
3067 /*
3068 * Periodic address status verification
3069 */
3070
3071 static void addrconf_verify(unsigned long foo)
3072 {
3073 struct inet6_ifaddr *ifp;
3074 unsigned long now, next;
3075 int i;
3076
3077 spin_lock_bh(&addrconf_verify_lock);
3078 now = jiffies;
3079 next = now + ADDR_CHECK_FREQUENCY;
3080
3081 del_timer(&addr_chk_timer);
3082
3083 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3084
3085 restart:
3086 read_lock(&addrconf_hash_lock);
3087 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3088 unsigned long age;
3089 #ifdef CONFIG_IPV6_PRIVACY
3090 unsigned long regen_advance;
3091 #endif
3092
3093 if (ifp->flags & IFA_F_PERMANENT)
3094 continue;
3095
3096 spin_lock(&ifp->lock);
3097 age = (now - ifp->tstamp) / HZ;
3098
3099 #ifdef CONFIG_IPV6_PRIVACY
3100 regen_advance = ifp->idev->cnf.regen_max_retry *
3101 ifp->idev->cnf.dad_transmits *
3102 ifp->idev->nd_parms->retrans_time / HZ;
3103 #endif
3104
3105 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3106 age >= ifp->valid_lft) {
3107 spin_unlock(&ifp->lock);
3108 in6_ifa_hold(ifp);
3109 read_unlock(&addrconf_hash_lock);
3110 ipv6_del_addr(ifp);
3111 goto restart;
3112 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3113 spin_unlock(&ifp->lock);
3114 continue;
3115 } else if (age >= ifp->prefered_lft) {
3116 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3117 int deprecate = 0;
3118
3119 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3120 deprecate = 1;
3121 ifp->flags |= IFA_F_DEPRECATED;
3122 }
3123
3124 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3125 next = ifp->tstamp + ifp->valid_lft * HZ;
3126
3127 spin_unlock(&ifp->lock);
3128
3129 if (deprecate) {
3130 in6_ifa_hold(ifp);
3131 read_unlock(&addrconf_hash_lock);
3132
3133 ipv6_ifa_notify(0, ifp);
3134 in6_ifa_put(ifp);
3135 goto restart;
3136 }
3137 #ifdef CONFIG_IPV6_PRIVACY
3138 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3139 !(ifp->flags&IFA_F_TENTATIVE)) {
3140 if (age >= ifp->prefered_lft - regen_advance) {
3141 struct inet6_ifaddr *ifpub = ifp->ifpub;
3142 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3143 next = ifp->tstamp + ifp->prefered_lft * HZ;
3144 if (!ifp->regen_count && ifpub) {
3145 ifp->regen_count++;
3146 in6_ifa_hold(ifp);
3147 in6_ifa_hold(ifpub);
3148 spin_unlock(&ifp->lock);
3149 read_unlock(&addrconf_hash_lock);
3150 spin_lock(&ifpub->lock);
3151 ifpub->regen_count = 0;
3152 spin_unlock(&ifpub->lock);
3153 ipv6_create_tempaddr(ifpub, ifp);
3154 in6_ifa_put(ifpub);
3155 in6_ifa_put(ifp);
3156 goto restart;
3157 }
3158 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3159 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3160 spin_unlock(&ifp->lock);
3161 #endif
3162 } else {
3163 /* ifp->prefered_lft <= ifp->valid_lft */
3164 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3165 next = ifp->tstamp + ifp->prefered_lft * HZ;
3166 spin_unlock(&ifp->lock);
3167 }
3168 }
3169 read_unlock(&addrconf_hash_lock);
3170 }
3171
3172 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3173 add_timer(&addr_chk_timer);
3174 spin_unlock_bh(&addrconf_verify_lock);
3175 }
3176
3177 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3178 {
3179 struct in6_addr *pfx = NULL;
3180
3181 if (addr)
3182 pfx = nla_data(addr);
3183
3184 if (local) {
3185 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3186 pfx = NULL;
3187 else
3188 pfx = nla_data(local);
3189 }
3190
3191 return pfx;
3192 }
3193
3194 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3195 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3196 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3197 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3198 };
3199
3200 static int
3201 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3202 {
3203 struct net *net = sock_net(skb->sk);
3204 struct ifaddrmsg *ifm;
3205 struct nlattr *tb[IFA_MAX+1];
3206 struct in6_addr *pfx;
3207 int err;
3208
3209 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3210 if (err < 0)
3211 return err;
3212
3213 ifm = nlmsg_data(nlh);
3214 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3215 if (pfx == NULL)
3216 return -EINVAL;
3217
3218 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3219 }
3220
3221 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3222 u32 prefered_lft, u32 valid_lft)
3223 {
3224 u32 flags;
3225 clock_t expires;
3226 unsigned long timeout;
3227
3228 if (!valid_lft || (prefered_lft > valid_lft))
3229 return -EINVAL;
3230
3231 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3232 if (addrconf_finite_timeout(timeout)) {
3233 expires = jiffies_to_clock_t(timeout * HZ);
3234 valid_lft = timeout;
3235 flags = RTF_EXPIRES;
3236 } else {
3237 expires = 0;
3238 flags = 0;
3239 ifa_flags |= IFA_F_PERMANENT;
3240 }
3241
3242 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3243 if (addrconf_finite_timeout(timeout)) {
3244 if (timeout == 0)
3245 ifa_flags |= IFA_F_DEPRECATED;
3246 prefered_lft = timeout;
3247 }
3248
3249 spin_lock_bh(&ifp->lock);
3250 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3251 ifp->tstamp = jiffies;
3252 ifp->valid_lft = valid_lft;
3253 ifp->prefered_lft = prefered_lft;
3254
3255 spin_unlock_bh(&ifp->lock);
3256 if (!(ifp->flags&IFA_F_TENTATIVE))
3257 ipv6_ifa_notify(0, ifp);
3258
3259 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3260 expires, flags);
3261 addrconf_verify(0);
3262
3263 return 0;
3264 }
3265
3266 static int
3267 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3268 {
3269 struct net *net = sock_net(skb->sk);
3270 struct ifaddrmsg *ifm;
3271 struct nlattr *tb[IFA_MAX+1];
3272 struct in6_addr *pfx;
3273 struct inet6_ifaddr *ifa;
3274 struct net_device *dev;
3275 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3276 u8 ifa_flags;
3277 int err;
3278
3279 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3280 if (err < 0)
3281 return err;
3282
3283 ifm = nlmsg_data(nlh);
3284 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3285 if (pfx == NULL)
3286 return -EINVAL;
3287
3288 if (tb[IFA_CACHEINFO]) {
3289 struct ifa_cacheinfo *ci;
3290
3291 ci = nla_data(tb[IFA_CACHEINFO]);
3292 valid_lft = ci->ifa_valid;
3293 preferred_lft = ci->ifa_prefered;
3294 } else {
3295 preferred_lft = INFINITY_LIFE_TIME;
3296 valid_lft = INFINITY_LIFE_TIME;
3297 }
3298
3299 dev = __dev_get_by_index(net, ifm->ifa_index);
3300 if (dev == NULL)
3301 return -ENODEV;
3302
3303 /* We ignore other flags so far. */
3304 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3305
3306 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3307 if (ifa == NULL) {
3308 /*
3309 * It would be best to check for !NLM_F_CREATE here but
3310 * userspace alreay relies on not having to provide this.
3311 */
3312 return inet6_addr_add(net, ifm->ifa_index, pfx,
3313 ifm->ifa_prefixlen, ifa_flags,
3314 preferred_lft, valid_lft);
3315 }
3316
3317 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3318 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3319 err = -EEXIST;
3320 else
3321 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3322
3323 in6_ifa_put(ifa);
3324
3325 return err;
3326 }
3327
3328 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3329 u8 scope, int ifindex)
3330 {
3331 struct ifaddrmsg *ifm;
3332
3333 ifm = nlmsg_data(nlh);
3334 ifm->ifa_family = AF_INET6;
3335 ifm->ifa_prefixlen = prefixlen;
3336 ifm->ifa_flags = flags;
3337 ifm->ifa_scope = scope;
3338 ifm->ifa_index = ifindex;
3339 }
3340
3341 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3342 unsigned long tstamp, u32 preferred, u32 valid)
3343 {
3344 struct ifa_cacheinfo ci;
3345
3346 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3347 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3348 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3349 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3350 ci.ifa_prefered = preferred;
3351 ci.ifa_valid = valid;
3352
3353 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3354 }
3355
3356 static inline int rt_scope(int ifa_scope)
3357 {
3358 if (ifa_scope & IFA_HOST)
3359 return RT_SCOPE_HOST;
3360 else if (ifa_scope & IFA_LINK)
3361 return RT_SCOPE_LINK;
3362 else if (ifa_scope & IFA_SITE)
3363 return RT_SCOPE_SITE;
3364 else
3365 return RT_SCOPE_UNIVERSE;
3366 }
3367
3368 static inline int inet6_ifaddr_msgsize(void)
3369 {
3370 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3371 + nla_total_size(16) /* IFA_ADDRESS */
3372 + nla_total_size(sizeof(struct ifa_cacheinfo));
3373 }
3374
3375 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3376 u32 pid, u32 seq, int event, unsigned int flags)
3377 {
3378 struct nlmsghdr *nlh;
3379 u32 preferred, valid;
3380
3381 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3382 if (nlh == NULL)
3383 return -EMSGSIZE;
3384
3385 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3386 ifa->idev->dev->ifindex);
3387
3388 if (!(ifa->flags&IFA_F_PERMANENT)) {
3389 preferred = ifa->prefered_lft;
3390 valid = ifa->valid_lft;
3391 if (preferred != INFINITY_LIFE_TIME) {
3392 long tval = (jiffies - ifa->tstamp)/HZ;
3393 preferred -= tval;
3394 if (valid != INFINITY_LIFE_TIME)
3395 valid -= tval;
3396 }
3397 } else {
3398 preferred = INFINITY_LIFE_TIME;
3399 valid = INFINITY_LIFE_TIME;
3400 }
3401
3402 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3403 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3404 nlmsg_cancel(skb, nlh);
3405 return -EMSGSIZE;
3406 }
3407
3408 return nlmsg_end(skb, nlh);
3409 }
3410
3411 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3412 u32 pid, u32 seq, int event, u16 flags)
3413 {
3414 struct nlmsghdr *nlh;
3415 u8 scope = RT_SCOPE_UNIVERSE;
3416 int ifindex = ifmca->idev->dev->ifindex;
3417
3418 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3419 scope = RT_SCOPE_SITE;
3420
3421 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3422 if (nlh == NULL)
3423 return -EMSGSIZE;
3424
3425 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3426 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3427 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3428 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3429 nlmsg_cancel(skb, nlh);
3430 return -EMSGSIZE;
3431 }
3432
3433 return nlmsg_end(skb, nlh);
3434 }
3435
3436 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3437 u32 pid, u32 seq, int event, unsigned int flags)
3438 {
3439 struct nlmsghdr *nlh;
3440 u8 scope = RT_SCOPE_UNIVERSE;
3441 int ifindex = ifaca->aca_idev->dev->ifindex;
3442
3443 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3444 scope = RT_SCOPE_SITE;
3445
3446 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3447 if (nlh == NULL)
3448 return -EMSGSIZE;
3449
3450 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3451 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3452 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3453 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3454 nlmsg_cancel(skb, nlh);
3455 return -EMSGSIZE;
3456 }
3457
3458 return nlmsg_end(skb, nlh);
3459 }
3460
3461 enum addr_type_t
3462 {
3463 UNICAST_ADDR,
3464 MULTICAST_ADDR,
3465 ANYCAST_ADDR,
3466 };
3467
3468 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3469 enum addr_type_t type)
3470 {
3471 int idx, ip_idx;
3472 int s_idx, s_ip_idx;
3473 int err = 1;
3474 struct net_device *dev;
3475 struct inet6_dev *idev = NULL;
3476 struct inet6_ifaddr *ifa;
3477 struct ifmcaddr6 *ifmca;
3478 struct ifacaddr6 *ifaca;
3479 struct net *net = sock_net(skb->sk);
3480
3481 s_idx = cb->args[0];
3482 s_ip_idx = ip_idx = cb->args[1];
3483
3484 idx = 0;
3485 for_each_netdev(net, dev) {
3486 if (idx < s_idx)
3487 goto cont;
3488 if (idx > s_idx)
3489 s_ip_idx = 0;
3490 ip_idx = 0;
3491 if ((idev = in6_dev_get(dev)) == NULL)
3492 goto cont;
3493 read_lock_bh(&idev->lock);
3494 switch (type) {
3495 case UNICAST_ADDR:
3496 /* unicast address incl. temp addr */
3497 for (ifa = idev->addr_list; ifa;
3498 ifa = ifa->if_next, ip_idx++) {
3499 if (ip_idx < s_ip_idx)
3500 continue;
3501 err = inet6_fill_ifaddr(skb, ifa,
3502 NETLINK_CB(cb->skb).pid,
3503 cb->nlh->nlmsg_seq,
3504 RTM_NEWADDR,
3505 NLM_F_MULTI);
3506 }
3507 break;
3508 case MULTICAST_ADDR:
3509 /* multicast address */
3510 for (ifmca = idev->mc_list; ifmca;
3511 ifmca = ifmca->next, ip_idx++) {
3512 if (ip_idx < s_ip_idx)
3513 continue;
3514 err = inet6_fill_ifmcaddr(skb, ifmca,
3515 NETLINK_CB(cb->skb).pid,
3516 cb->nlh->nlmsg_seq,
3517 RTM_GETMULTICAST,
3518 NLM_F_MULTI);
3519 }
3520 break;
3521 case ANYCAST_ADDR:
3522 /* anycast address */
3523 for (ifaca = idev->ac_list; ifaca;
3524 ifaca = ifaca->aca_next, ip_idx++) {
3525 if (ip_idx < s_ip_idx)
3526 continue;
3527 err = inet6_fill_ifacaddr(skb, ifaca,
3528 NETLINK_CB(cb->skb).pid,
3529 cb->nlh->nlmsg_seq,
3530 RTM_GETANYCAST,
3531 NLM_F_MULTI);
3532 }
3533 break;
3534 default:
3535 break;
3536 }
3537 read_unlock_bh(&idev->lock);
3538 in6_dev_put(idev);
3539
3540 if (err <= 0)
3541 break;
3542 cont:
3543 idx++;
3544 }
3545 cb->args[0] = idx;
3546 cb->args[1] = ip_idx;
3547 return skb->len;
3548 }
3549
3550 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3551 {
3552 enum addr_type_t type = UNICAST_ADDR;
3553
3554 return inet6_dump_addr(skb, cb, type);
3555 }
3556
3557 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3558 {
3559 enum addr_type_t type = MULTICAST_ADDR;
3560
3561 return inet6_dump_addr(skb, cb, type);
3562 }
3563
3564
3565 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3566 {
3567 enum addr_type_t type = ANYCAST_ADDR;
3568
3569 return inet6_dump_addr(skb, cb, type);
3570 }
3571
3572 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3573 void *arg)
3574 {
3575 struct net *net = sock_net(in_skb->sk);
3576 struct ifaddrmsg *ifm;
3577 struct nlattr *tb[IFA_MAX+1];
3578 struct in6_addr *addr = NULL;
3579 struct net_device *dev = NULL;
3580 struct inet6_ifaddr *ifa;
3581 struct sk_buff *skb;
3582 int err;
3583
3584 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3585 if (err < 0)
3586 goto errout;
3587
3588 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3589 if (addr == NULL) {
3590 err = -EINVAL;
3591 goto errout;
3592 }
3593
3594 ifm = nlmsg_data(nlh);
3595 if (ifm->ifa_index)
3596 dev = __dev_get_by_index(net, ifm->ifa_index);
3597
3598 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3599 err = -EADDRNOTAVAIL;
3600 goto errout;
3601 }
3602
3603 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3604 err = -ENOBUFS;
3605 goto errout_ifa;
3606 }
3607
3608 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3609 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3610 if (err < 0) {
3611 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3612 WARN_ON(err == -EMSGSIZE);
3613 kfree_skb(skb);
3614 goto errout_ifa;
3615 }
3616 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3617 errout_ifa:
3618 in6_ifa_put(ifa);
3619 errout:
3620 return err;
3621 }
3622
3623 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3624 {
3625 struct sk_buff *skb;
3626 struct net *net = dev_net(ifa->idev->dev);
3627 int err = -ENOBUFS;
3628
3629 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3630 if (skb == NULL)
3631 goto errout;
3632
3633 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3634 if (err < 0) {
3635 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3636 WARN_ON(err == -EMSGSIZE);
3637 kfree_skb(skb);
3638 goto errout;
3639 }
3640 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3641 errout:
3642 if (err < 0)
3643 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3644 }
3645
3646 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3647 __s32 *array, int bytes)
3648 {
3649 BUG_ON(bytes < (DEVCONF_MAX * 4));
3650
3651 memset(array, 0, bytes);
3652 array[DEVCONF_FORWARDING] = cnf->forwarding;
3653 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3654 array[DEVCONF_MTU6] = cnf->mtu6;
3655 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3656 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3657 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3658 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3659 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3660 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3661 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3662 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3663 #ifdef CONFIG_IPV6_PRIVACY
3664 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3665 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3666 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3667 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3668 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3669 #endif
3670 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3671 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3672 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3673 #ifdef CONFIG_IPV6_ROUTER_PREF
3674 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3675 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3676 #ifdef CONFIG_IPV6_ROUTE_INFO
3677 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3678 #endif
3679 #endif
3680 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3681 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3682 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3683 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3684 #endif
3685 #ifdef CONFIG_IPV6_MROUTE
3686 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3687 #endif
3688 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3689 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3690 }
3691
3692 static inline size_t inet6_if_nlmsg_size(void)
3693 {
3694 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3695 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3696 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3697 + nla_total_size(4) /* IFLA_MTU */
3698 + nla_total_size(4) /* IFLA_LINK */
3699 + nla_total_size( /* IFLA_PROTINFO */
3700 nla_total_size(4) /* IFLA_INET6_FLAGS */
3701 + nla_total_size(sizeof(struct ifla_cacheinfo))
3702 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3703 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3704 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3705 );
3706 }
3707
3708 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3709 int bytes)
3710 {
3711 int i;
3712 int pad = bytes - sizeof(u64) * items;
3713 BUG_ON(pad < 0);
3714
3715 /* Use put_unaligned() because stats may not be aligned for u64. */
3716 put_unaligned(items, &stats[0]);
3717 for (i = 1; i < items; i++)
3718 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3719
3720 memset(&stats[items], 0, pad);
3721 }
3722
3723 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3724 int bytes)
3725 {
3726 switch(attrtype) {
3727 case IFLA_INET6_STATS:
3728 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3729 break;
3730 case IFLA_INET6_ICMP6STATS:
3731 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3732 break;
3733 }
3734 }
3735
3736 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3737 u32 pid, u32 seq, int event, unsigned int flags)
3738 {
3739 struct net_device *dev = idev->dev;
3740 struct nlattr *nla;
3741 struct ifinfomsg *hdr;
3742 struct nlmsghdr *nlh;
3743 void *protoinfo;
3744 struct ifla_cacheinfo ci;
3745
3746 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3747 if (nlh == NULL)
3748 return -EMSGSIZE;
3749
3750 hdr = nlmsg_data(nlh);
3751 hdr->ifi_family = AF_INET6;
3752 hdr->__ifi_pad = 0;
3753 hdr->ifi_type = dev->type;
3754 hdr->ifi_index = dev->ifindex;
3755 hdr->ifi_flags = dev_get_flags(dev);
3756 hdr->ifi_change = 0;
3757
3758 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3759
3760 if (dev->addr_len)
3761 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3762
3763 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3764 if (dev->ifindex != dev->iflink)
3765 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3766
3767 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3768 if (protoinfo == NULL)
3769 goto nla_put_failure;
3770
3771 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3772
3773 ci.max_reasm_len = IPV6_MAXPLEN;
3774 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3775 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3776 ci.reachable_time = idev->nd_parms->reachable_time;
3777 ci.retrans_time = idev->nd_parms->retrans_time;
3778 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3779
3780 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3781 if (nla == NULL)
3782 goto nla_put_failure;
3783 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3784
3785 /* XXX - MC not implemented */
3786
3787 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3788 if (nla == NULL)
3789 goto nla_put_failure;
3790 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3791
3792 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3793 if (nla == NULL)
3794 goto nla_put_failure;
3795 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3796
3797 nla_nest_end(skb, protoinfo);
3798 return nlmsg_end(skb, nlh);
3799
3800 nla_put_failure:
3801 nlmsg_cancel(skb, nlh);
3802 return -EMSGSIZE;
3803 }
3804
3805 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3806 {
3807 struct net *net = sock_net(skb->sk);
3808 int idx, err;
3809 int s_idx = cb->args[0];
3810 struct net_device *dev;
3811 struct inet6_dev *idev;
3812
3813 read_lock(&dev_base_lock);
3814 idx = 0;
3815 for_each_netdev(net, dev) {
3816 if (idx < s_idx)
3817 goto cont;
3818 if ((idev = in6_dev_get(dev)) == NULL)
3819 goto cont;
3820 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3821 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3822 in6_dev_put(idev);
3823 if (err <= 0)
3824 break;
3825 cont:
3826 idx++;
3827 }
3828 read_unlock(&dev_base_lock);
3829 cb->args[0] = idx;
3830
3831 return skb->len;
3832 }
3833
3834 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3835 {
3836 struct sk_buff *skb;
3837 struct net *net = dev_net(idev->dev);
3838 int err = -ENOBUFS;
3839
3840 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3841 if (skb == NULL)
3842 goto errout;
3843
3844 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3845 if (err < 0) {
3846 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3847 WARN_ON(err == -EMSGSIZE);
3848 kfree_skb(skb);
3849 goto errout;
3850 }
3851 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3852 errout:
3853 if (err < 0)
3854 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3855 }
3856
3857 static inline size_t inet6_prefix_nlmsg_size(void)
3858 {
3859 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3860 + nla_total_size(sizeof(struct in6_addr))
3861 + nla_total_size(sizeof(struct prefix_cacheinfo));
3862 }
3863
3864 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3865 struct prefix_info *pinfo, u32 pid, u32 seq,
3866 int event, unsigned int flags)
3867 {
3868 struct prefixmsg *pmsg;
3869 struct nlmsghdr *nlh;
3870 struct prefix_cacheinfo ci;
3871
3872 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3873 if (nlh == NULL)
3874 return -EMSGSIZE;
3875
3876 pmsg = nlmsg_data(nlh);
3877 pmsg->prefix_family = AF_INET6;
3878 pmsg->prefix_pad1 = 0;
3879 pmsg->prefix_pad2 = 0;
3880 pmsg->prefix_ifindex = idev->dev->ifindex;
3881 pmsg->prefix_len = pinfo->prefix_len;
3882 pmsg->prefix_type = pinfo->type;
3883 pmsg->prefix_pad3 = 0;
3884 pmsg->prefix_flags = 0;
3885 if (pinfo->onlink)
3886 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3887 if (pinfo->autoconf)
3888 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3889
3890 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3891
3892 ci.preferred_time = ntohl(pinfo->prefered);
3893 ci.valid_time = ntohl(pinfo->valid);
3894 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3895
3896 return nlmsg_end(skb, nlh);
3897
3898 nla_put_failure:
3899 nlmsg_cancel(skb, nlh);
3900 return -EMSGSIZE;
3901 }
3902
3903 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3904 struct prefix_info *pinfo)
3905 {
3906 struct sk_buff *skb;
3907 struct net *net = dev_net(idev->dev);
3908 int err = -ENOBUFS;
3909
3910 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3911 if (skb == NULL)
3912 goto errout;
3913
3914 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3915 if (err < 0) {
3916 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3917 WARN_ON(err == -EMSGSIZE);
3918 kfree_skb(skb);
3919 goto errout;
3920 }
3921 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3922 errout:
3923 if (err < 0)
3924 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3925 }
3926
3927 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3928 {
3929 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3930
3931 switch (event) {
3932 case RTM_NEWADDR:
3933 /*
3934 * If the address was optimistic
3935 * we inserted the route at the start of
3936 * our DAD process, so we don't need
3937 * to do it again
3938 */
3939 if (!(ifp->rt->rt6i_node))
3940 ip6_ins_rt(ifp->rt);
3941 if (ifp->idev->cnf.forwarding)
3942 addrconf_join_anycast(ifp);
3943 break;
3944 case RTM_DELADDR:
3945 if (ifp->idev->cnf.forwarding)
3946 addrconf_leave_anycast(ifp);
3947 addrconf_leave_solict(ifp->idev, &ifp->addr);
3948 dst_hold(&ifp->rt->u.dst);
3949 if (ip6_del_rt(ifp->rt))
3950 dst_free(&ifp->rt->u.dst);
3951 break;
3952 }
3953 }
3954
3955 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3956 {
3957 rcu_read_lock_bh();
3958 if (likely(ifp->idev->dead == 0))
3959 __ipv6_ifa_notify(event, ifp);
3960 rcu_read_unlock_bh();
3961 }
3962
3963 #ifdef CONFIG_SYSCTL
3964
3965 static
3966 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3967 void __user *buffer, size_t *lenp, loff_t *ppos)
3968 {
3969 int *valp = ctl->data;
3970 int val = *valp;
3971 int ret;
3972
3973 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3974
3975 if (write)
3976 addrconf_fixup_forwarding(ctl, valp, val);
3977 return ret;
3978 }
3979
3980 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3981 int __user *name, int nlen,
3982 void __user *oldval,
3983 size_t __user *oldlenp,
3984 void __user *newval, size_t newlen)
3985 {
3986 int *valp = table->data;
3987 int val = *valp;
3988 int new;
3989
3990 if (!newval || !newlen)
3991 return 0;
3992 if (newlen != sizeof(int))
3993 return -EINVAL;
3994 if (get_user(new, (int __user *)newval))
3995 return -EFAULT;
3996 if (new == *valp)
3997 return 0;
3998 if (oldval && oldlenp) {
3999 size_t len;
4000 if (get_user(len, oldlenp))
4001 return -EFAULT;
4002 if (len) {
4003 if (len > table->maxlen)
4004 len = table->maxlen;
4005 if (copy_to_user(oldval, valp, len))
4006 return -EFAULT;
4007 if (put_user(len, oldlenp))
4008 return -EFAULT;
4009 }
4010 }
4011
4012 *valp = new;
4013 addrconf_fixup_forwarding(table, valp, val);
4014 return 1;
4015 }
4016
4017 static struct addrconf_sysctl_table
4018 {
4019 struct ctl_table_header *sysctl_header;
4020 ctl_table addrconf_vars[DEVCONF_MAX+1];
4021 char *dev_name;
4022 } addrconf_sysctl __read_mostly = {
4023 .sysctl_header = NULL,
4024 .addrconf_vars = {
4025 {
4026 .ctl_name = NET_IPV6_FORWARDING,
4027 .procname = "forwarding",
4028 .data = &ipv6_devconf.forwarding,
4029 .maxlen = sizeof(int),
4030 .mode = 0644,
4031 .proc_handler = &addrconf_sysctl_forward,
4032 .strategy = &addrconf_sysctl_forward_strategy,
4033 },
4034 {
4035 .ctl_name = NET_IPV6_HOP_LIMIT,
4036 .procname = "hop_limit",
4037 .data = &ipv6_devconf.hop_limit,
4038 .maxlen = sizeof(int),
4039 .mode = 0644,
4040 .proc_handler = proc_dointvec,
4041 },
4042 {
4043 .ctl_name = NET_IPV6_MTU,
4044 .procname = "mtu",
4045 .data = &ipv6_devconf.mtu6,
4046 .maxlen = sizeof(int),
4047 .mode = 0644,
4048 .proc_handler = &proc_dointvec,
4049 },
4050 {
4051 .ctl_name = NET_IPV6_ACCEPT_RA,
4052 .procname = "accept_ra",
4053 .data = &ipv6_devconf.accept_ra,
4054 .maxlen = sizeof(int),
4055 .mode = 0644,
4056 .proc_handler = &proc_dointvec,
4057 },
4058 {
4059 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
4060 .procname = "accept_redirects",
4061 .data = &ipv6_devconf.accept_redirects,
4062 .maxlen = sizeof(int),
4063 .mode = 0644,
4064 .proc_handler = &proc_dointvec,
4065 },
4066 {
4067 .ctl_name = NET_IPV6_AUTOCONF,
4068 .procname = "autoconf",
4069 .data = &ipv6_devconf.autoconf,
4070 .maxlen = sizeof(int),
4071 .mode = 0644,
4072 .proc_handler = &proc_dointvec,
4073 },
4074 {
4075 .ctl_name = NET_IPV6_DAD_TRANSMITS,
4076 .procname = "dad_transmits",
4077 .data = &ipv6_devconf.dad_transmits,
4078 .maxlen = sizeof(int),
4079 .mode = 0644,
4080 .proc_handler = &proc_dointvec,
4081 },
4082 {
4083 .ctl_name = NET_IPV6_RTR_SOLICITS,
4084 .procname = "router_solicitations",
4085 .data = &ipv6_devconf.rtr_solicits,
4086 .maxlen = sizeof(int),
4087 .mode = 0644,
4088 .proc_handler = &proc_dointvec,
4089 },
4090 {
4091 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
4092 .procname = "router_solicitation_interval",
4093 .data = &ipv6_devconf.rtr_solicit_interval,
4094 .maxlen = sizeof(int),
4095 .mode = 0644,
4096 .proc_handler = &proc_dointvec_jiffies,
4097 .strategy = &sysctl_jiffies,
4098 },
4099 {
4100 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
4101 .procname = "router_solicitation_delay",
4102 .data = &ipv6_devconf.rtr_solicit_delay,
4103 .maxlen = sizeof(int),
4104 .mode = 0644,
4105 .proc_handler = &proc_dointvec_jiffies,
4106 .strategy = &sysctl_jiffies,
4107 },
4108 {
4109 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
4110 .procname = "force_mld_version",
4111 .data = &ipv6_devconf.force_mld_version,
4112 .maxlen = sizeof(int),
4113 .mode = 0644,
4114 .proc_handler = &proc_dointvec,
4115 },
4116 #ifdef CONFIG_IPV6_PRIVACY
4117 {
4118 .ctl_name = NET_IPV6_USE_TEMPADDR,
4119 .procname = "use_tempaddr",
4120 .data = &ipv6_devconf.use_tempaddr,
4121 .maxlen = sizeof(int),
4122 .mode = 0644,
4123 .proc_handler = &proc_dointvec,
4124 },
4125 {
4126 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
4127 .procname = "temp_valid_lft",
4128 .data = &ipv6_devconf.temp_valid_lft,
4129 .maxlen = sizeof(int),
4130 .mode = 0644,
4131 .proc_handler = &proc_dointvec,
4132 },
4133 {
4134 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4135 .procname = "temp_prefered_lft",
4136 .data = &ipv6_devconf.temp_prefered_lft,
4137 .maxlen = sizeof(int),
4138 .mode = 0644,
4139 .proc_handler = &proc_dointvec,
4140 },
4141 {
4142 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4143 .procname = "regen_max_retry",
4144 .data = &ipv6_devconf.regen_max_retry,
4145 .maxlen = sizeof(int),
4146 .mode = 0644,
4147 .proc_handler = &proc_dointvec,
4148 },
4149 {
4150 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4151 .procname = "max_desync_factor",
4152 .data = &ipv6_devconf.max_desync_factor,
4153 .maxlen = sizeof(int),
4154 .mode = 0644,
4155 .proc_handler = &proc_dointvec,
4156 },
4157 #endif
4158 {
4159 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4160 .procname = "max_addresses",
4161 .data = &ipv6_devconf.max_addresses,
4162 .maxlen = sizeof(int),
4163 .mode = 0644,
4164 .proc_handler = &proc_dointvec,
4165 },
4166 {
4167 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4168 .procname = "accept_ra_defrtr",
4169 .data = &ipv6_devconf.accept_ra_defrtr,
4170 .maxlen = sizeof(int),
4171 .mode = 0644,
4172 .proc_handler = &proc_dointvec,
4173 },
4174 {
4175 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4176 .procname = "accept_ra_pinfo",
4177 .data = &ipv6_devconf.accept_ra_pinfo,
4178 .maxlen = sizeof(int),
4179 .mode = 0644,
4180 .proc_handler = &proc_dointvec,
4181 },
4182 #ifdef CONFIG_IPV6_ROUTER_PREF
4183 {
4184 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4185 .procname = "accept_ra_rtr_pref",
4186 .data = &ipv6_devconf.accept_ra_rtr_pref,
4187 .maxlen = sizeof(int),
4188 .mode = 0644,
4189 .proc_handler = &proc_dointvec,
4190 },
4191 {
4192 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4193 .procname = "router_probe_interval",
4194 .data = &ipv6_devconf.rtr_probe_interval,
4195 .maxlen = sizeof(int),
4196 .mode = 0644,
4197 .proc_handler = &proc_dointvec_jiffies,
4198 .strategy = &sysctl_jiffies,
4199 },
4200 #ifdef CONFIG_IPV6_ROUTE_INFO
4201 {
4202 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4203 .procname = "accept_ra_rt_info_max_plen",
4204 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4205 .maxlen = sizeof(int),
4206 .mode = 0644,
4207 .proc_handler = &proc_dointvec,
4208 },
4209 #endif
4210 #endif
4211 {
4212 .ctl_name = NET_IPV6_PROXY_NDP,
4213 .procname = "proxy_ndp",
4214 .data = &ipv6_devconf.proxy_ndp,
4215 .maxlen = sizeof(int),
4216 .mode = 0644,
4217 .proc_handler = &proc_dointvec,
4218 },
4219 {
4220 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4221 .procname = "accept_source_route",
4222 .data = &ipv6_devconf.accept_source_route,
4223 .maxlen = sizeof(int),
4224 .mode = 0644,
4225 .proc_handler = &proc_dointvec,
4226 },
4227 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4228 {
4229 .ctl_name = CTL_UNNUMBERED,
4230 .procname = "optimistic_dad",
4231 .data = &ipv6_devconf.optimistic_dad,
4232 .maxlen = sizeof(int),
4233 .mode = 0644,
4234 .proc_handler = &proc_dointvec,
4235
4236 },
4237 #endif
4238 #ifdef CONFIG_IPV6_MROUTE
4239 {
4240 .ctl_name = CTL_UNNUMBERED,
4241 .procname = "mc_forwarding",
4242 .data = &ipv6_devconf.mc_forwarding,
4243 .maxlen = sizeof(int),
4244 .mode = 0644,
4245 .proc_handler = &proc_dointvec,
4246 },
4247 #endif
4248 {
4249 .ctl_name = CTL_UNNUMBERED,
4250 .procname = "disable_ipv6",
4251 .data = &ipv6_devconf.disable_ipv6,
4252 .maxlen = sizeof(int),
4253 .mode = 0644,
4254 .proc_handler = &proc_dointvec,
4255 },
4256 {
4257 .ctl_name = CTL_UNNUMBERED,
4258 .procname = "accept_dad",
4259 .data = &ipv6_devconf.accept_dad,
4260 .maxlen = sizeof(int),
4261 .mode = 0644,
4262 .proc_handler = &proc_dointvec,
4263 },
4264 {
4265 .ctl_name = 0, /* sentinel */
4266 }
4267 },
4268 };
4269
4270 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4271 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4272 {
4273 int i;
4274 struct addrconf_sysctl_table *t;
4275
4276 #define ADDRCONF_CTL_PATH_DEV 3
4277
4278 struct ctl_path addrconf_ctl_path[] = {
4279 { .procname = "net", .ctl_name = CTL_NET, },
4280 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4281 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4282 { /* to be set */ },
4283 { },
4284 };
4285
4286
4287 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4288 if (t == NULL)
4289 goto out;
4290
4291 for (i=0; t->addrconf_vars[i].data; i++) {
4292 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4293 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4294 t->addrconf_vars[i].extra2 = net;
4295 }
4296
4297 /*
4298 * Make a copy of dev_name, because '.procname' is regarded as const
4299 * by sysctl and we wouldn't want anyone to change it under our feet
4300 * (see SIOCSIFNAME).
4301 */
4302 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4303 if (!t->dev_name)
4304 goto free;
4305
4306 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4307 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4308
4309 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4310 t->addrconf_vars);
4311 if (t->sysctl_header == NULL)
4312 goto free_procname;
4313
4314 p->sysctl = t;
4315 return 0;
4316
4317 free_procname:
4318 kfree(t->dev_name);
4319 free:
4320 kfree(t);
4321 out:
4322 return -ENOBUFS;
4323 }
4324
4325 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4326 {
4327 struct addrconf_sysctl_table *t;
4328
4329 if (p->sysctl == NULL)
4330 return;
4331
4332 t = p->sysctl;
4333 p->sysctl = NULL;
4334 unregister_sysctl_table(t->sysctl_header);
4335 kfree(t->dev_name);
4336 kfree(t);
4337 }
4338
4339 static void addrconf_sysctl_register(struct inet6_dev *idev)
4340 {
4341 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4342 NET_IPV6_NEIGH, "ipv6",
4343 &ndisc_ifinfo_sysctl_change,
4344 ndisc_ifinfo_sysctl_strategy);
4345 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4346 idev->dev->ifindex, idev, &idev->cnf);
4347 }
4348
4349 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4350 {
4351 __addrconf_sysctl_unregister(&idev->cnf);
4352 neigh_sysctl_unregister(idev->nd_parms);
4353 }
4354
4355
4356 #endif
4357
4358 static int addrconf_init_net(struct net *net)
4359 {
4360 int err;
4361 struct ipv6_devconf *all, *dflt;
4362
4363 err = -ENOMEM;
4364 all = &ipv6_devconf;
4365 dflt = &ipv6_devconf_dflt;
4366
4367 if (net != &init_net) {
4368 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4369 if (all == NULL)
4370 goto err_alloc_all;
4371
4372 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4373 if (dflt == NULL)
4374 goto err_alloc_dflt;
4375 }
4376
4377 net->ipv6.devconf_all = all;
4378 net->ipv6.devconf_dflt = dflt;
4379
4380 #ifdef CONFIG_SYSCTL
4381 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4382 NULL, all);
4383 if (err < 0)
4384 goto err_reg_all;
4385
4386 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4387 NULL, dflt);
4388 if (err < 0)
4389 goto err_reg_dflt;
4390 #endif
4391 return 0;
4392
4393 #ifdef CONFIG_SYSCTL
4394 err_reg_dflt:
4395 __addrconf_sysctl_unregister(all);
4396 err_reg_all:
4397 kfree(dflt);
4398 #endif
4399 err_alloc_dflt:
4400 kfree(all);
4401 err_alloc_all:
4402 return err;
4403 }
4404
4405 static void addrconf_exit_net(struct net *net)
4406 {
4407 #ifdef CONFIG_SYSCTL
4408 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4409 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4410 #endif
4411 if (net != &init_net) {
4412 kfree(net->ipv6.devconf_dflt);
4413 kfree(net->ipv6.devconf_all);
4414 }
4415 }
4416
4417 static struct pernet_operations addrconf_ops = {
4418 .init = addrconf_init_net,
4419 .exit = addrconf_exit_net,
4420 };
4421
4422 /*
4423 * Device notifier
4424 */
4425
4426 int register_inet6addr_notifier(struct notifier_block *nb)
4427 {
4428 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4429 }
4430
4431 EXPORT_SYMBOL(register_inet6addr_notifier);
4432
4433 int unregister_inet6addr_notifier(struct notifier_block *nb)
4434 {
4435 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4436 }
4437
4438 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4439
4440 static void addrconf_net_exit(struct net *net)
4441 {
4442 struct net_device *dev;
4443
4444 rtnl_lock();
4445 /* clean dev list */
4446 for_each_netdev(net, dev) {
4447 if (__in6_dev_get(dev) == NULL)
4448 continue;
4449 addrconf_ifdown(dev, 1);
4450 }
4451 addrconf_ifdown(net->loopback_dev, 2);
4452 rtnl_unlock();
4453 }
4454
4455 static struct pernet_operations addrconf_net_ops = {
4456 .exit = addrconf_net_exit,
4457 };
4458
4459 /*
4460 * Init / cleanup code
4461 */
4462
4463 int __init addrconf_init(void)
4464 {
4465 int err;
4466
4467 if ((err = ipv6_addr_label_init()) < 0) {
4468 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4469 err);
4470 return err;
4471 }
4472
4473 register_pernet_subsys(&addrconf_ops);
4474
4475 /* The addrconf netdev notifier requires that loopback_dev
4476 * has it's ipv6 private information allocated and setup
4477 * before it can bring up and give link-local addresses
4478 * to other devices which are up.
4479 *
4480 * Unfortunately, loopback_dev is not necessarily the first
4481 * entry in the global dev_base list of net devices. In fact,
4482 * it is likely to be the very last entry on that list.
4483 * So this causes the notifier registry below to try and
4484 * give link-local addresses to all devices besides loopback_dev
4485 * first, then loopback_dev, which cases all the non-loopback_dev
4486 * devices to fail to get a link-local address.
4487 *
4488 * So, as a temporary fix, allocate the ipv6 structure for
4489 * loopback_dev first by hand.
4490 * Longer term, all of the dependencies ipv6 has upon the loopback
4491 * device and it being up should be removed.
4492 */
4493 rtnl_lock();
4494 if (!ipv6_add_dev(init_net.loopback_dev))
4495 err = -ENOMEM;
4496 rtnl_unlock();
4497 if (err)
4498 goto errlo;
4499
4500 err = register_pernet_device(&addrconf_net_ops);
4501 if (err)
4502 return err;
4503
4504 register_netdevice_notifier(&ipv6_dev_notf);
4505
4506 addrconf_verify(0);
4507
4508 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4509 if (err < 0)
4510 goto errout;
4511
4512 /* Only the first call to __rtnl_register can fail */
4513 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4514 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4515 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4516 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4517 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4518
4519 ipv6_addr_label_rtnl_register();
4520
4521 return 0;
4522 errout:
4523 unregister_netdevice_notifier(&ipv6_dev_notf);
4524 errlo:
4525 unregister_pernet_subsys(&addrconf_ops);
4526
4527 return err;
4528 }
4529
4530 void addrconf_cleanup(void)
4531 {
4532 struct inet6_ifaddr *ifa;
4533 int i;
4534
4535 unregister_netdevice_notifier(&ipv6_dev_notf);
4536 unregister_pernet_device(&addrconf_net_ops);
4537
4538 unregister_pernet_subsys(&addrconf_ops);
4539
4540 rtnl_lock();
4541
4542 /*
4543 * Check hash table.
4544 */
4545 write_lock_bh(&addrconf_hash_lock);
4546 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4547 for (ifa=inet6_addr_lst[i]; ifa; ) {
4548 struct inet6_ifaddr *bifa;
4549
4550 bifa = ifa;
4551 ifa = ifa->lst_next;
4552 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4553 /* Do not free it; something is wrong.
4554 Now we can investigate it with debugger.
4555 */
4556 }
4557 }
4558 write_unlock_bh(&addrconf_hash_lock);
4559
4560 del_timer(&addr_chk_timer);
4561 rtnl_unlock();
4562
4563 unregister_pernet_subsys(&addrconf_net_ops);
4564 }
Support for the Chinese Samsung S3C2440 based development boards