?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[NET] NETNS: Omit namespace comparision without CONFIG_NET_NS.
[linux-2.6/libata-dev.git] / net / ipv6 / addrconf.c
blob5ab9973571efbcf91a6bde5b390722e54c24babe
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17 /*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
41 */
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/socket.h>
46 #include <linux/sockios.h>
47 #include <linux/net.h>
48 #include <linux/in6.h>
49 #include <linux/netdevice.h>
50 #include <linux/if_addr.h>
51 #include <linux/if_arp.h>
52 #include <linux/if_arcnet.h>
53 #include <linux/if_infiniband.h>
54 #include <linux/route.h>
55 #include <linux/inetdevice.h>
56 #include <linux/init.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64
65 #include <net/net_namespace.h>
66 #include <net/sock.h>
67 #include <net/snmp.h>
68
69 #include <net/ipv6.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
74 #include <net/tcp.h>
75 #include <net/ip.h>
76 #include <net/netlink.h>
77 #include <net/pkt_sched.h>
78 #include <linux/if_tunnel.h>
79 #include <linux/rtnetlink.h>
80
81 #ifdef CONFIG_IPV6_PRIVACY
82 #include <linux/random.h>
83 #endif
84
85 #include <asm/uaccess.h>
86 #include <asm/unaligned.h>
87
88 #include <linux/proc_fs.h>
89 #include <linux/seq_file.h>
90
91 /* Set to 3 to get tracing... */
92 #define ACONF_DEBUG 2
93
94 #if ACONF_DEBUG >= 3
95 #define ADBG(x) printk x
96 #else
97 #define ADBG(x)
98 #endif
99
100 #define INFINITY_LIFE_TIME 0xFFFFFFFF
101 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102
103 #ifdef CONFIG_SYSCTL
104 static void addrconf_sysctl_register(struct inet6_dev *idev);
105 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
106 #else
107 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
108 {
109 }
110
111 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
112 {
113 }
114 #endif
115
116 #ifdef CONFIG_IPV6_PRIVACY
117 static int __ipv6_regen_rndid(struct inet6_dev *idev);
118 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
119 static void ipv6_regen_rndid(unsigned long data);
120
121 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
122 #endif
123
124 static int ipv6_count_addresses(struct inet6_dev *idev);
125
126 /*
127 * Configured unicast address hash table
128 */
129 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
130 static DEFINE_RWLOCK(addrconf_hash_lock);
131
132 static void addrconf_verify(unsigned long);
133
134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
135 static DEFINE_SPINLOCK(addrconf_verify_lock);
136
137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139
140 static int addrconf_ifdown(struct net_device *dev, int how);
141
142 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
143 static void addrconf_dad_timer(unsigned long data);
144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
145 static void addrconf_dad_run(struct inet6_dev *idev);
146 static void addrconf_rs_timer(unsigned long data);
147 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
149
150 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
151 struct prefix_info *pinfo);
152 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
153 struct net_device *dev);
154
155 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
156
157 struct ipv6_devconf ipv6_devconf __read_mostly = {
158 .forwarding = 0,
159 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
160 .mtu6 = IPV6_MIN_MTU,
161 .accept_ra = 1,
162 .accept_redirects = 1,
163 .autoconf = 1,
164 .force_mld_version = 0,
165 .dad_transmits = 1,
166 .rtr_solicits = MAX_RTR_SOLICITATIONS,
167 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
168 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
169 #ifdef CONFIG_IPV6_PRIVACY
170 .use_tempaddr = 0,
171 .temp_valid_lft = TEMP_VALID_LIFETIME,
172 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
173 .regen_max_retry = REGEN_MAX_RETRY,
174 .max_desync_factor = MAX_DESYNC_FACTOR,
175 #endif
176 .max_addresses = IPV6_MAX_ADDRESSES,
177 .accept_ra_defrtr = 1,
178 .accept_ra_pinfo = 1,
179 #ifdef CONFIG_IPV6_ROUTER_PREF
180 .accept_ra_rtr_pref = 1,
181 .rtr_probe_interval = 60 * HZ,
182 #ifdef CONFIG_IPV6_ROUTE_INFO
183 .accept_ra_rt_info_max_plen = 0,
184 #endif
185 #endif
186 .proxy_ndp = 0,
187 .accept_source_route = 0, /* we do not accept RH0 by default. */
188 };
189
190 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
191 .forwarding = 0,
192 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
193 .mtu6 = IPV6_MIN_MTU,
194 .accept_ra = 1,
195 .accept_redirects = 1,
196 .autoconf = 1,
197 .dad_transmits = 1,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
201 #ifdef CONFIG_IPV6_PRIVACY
202 .use_tempaddr = 0,
203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
207 #endif
208 .max_addresses = IPV6_MAX_ADDRESSES,
209 .accept_ra_defrtr = 1,
210 .accept_ra_pinfo = 1,
211 #ifdef CONFIG_IPV6_ROUTER_PREF
212 .accept_ra_rtr_pref = 1,
213 .rtr_probe_interval = 60 * HZ,
214 #ifdef CONFIG_IPV6_ROUTE_INFO
215 .accept_ra_rt_info_max_plen = 0,
216 #endif
217 #endif
218 .proxy_ndp = 0,
219 .accept_source_route = 0, /* we do not accept RH0 by default. */
220 };
221
222 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
223 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
224 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
225
226 /* Check if a valid qdisc is available */
227 static inline int addrconf_qdisc_ok(struct net_device *dev)
228 {
229 return (dev->qdisc != &noop_qdisc);
230 }
231
232 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
233 {
234 if (del_timer(&ifp->timer))
235 __in6_ifa_put(ifp);
236 }
237
238 enum addrconf_timer_t
239 {
240 AC_NONE,
241 AC_DAD,
242 AC_RS,
243 };
244
245 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
246 enum addrconf_timer_t what,
247 unsigned long when)
248 {
249 if (!del_timer(&ifp->timer))
250 in6_ifa_hold(ifp);
251
252 switch (what) {
253 case AC_DAD:
254 ifp->timer.function = addrconf_dad_timer;
255 break;
256 case AC_RS:
257 ifp->timer.function = addrconf_rs_timer;
258 break;
259 default:;
260 }
261 ifp->timer.expires = jiffies + when;
262 add_timer(&ifp->timer);
263 }
264
265 static int snmp6_alloc_dev(struct inet6_dev *idev)
266 {
267 if (snmp_mib_init((void **)idev->stats.ipv6,
268 sizeof(struct ipstats_mib)) < 0)
269 goto err_ip;
270 if (snmp_mib_init((void **)idev->stats.icmpv6,
271 sizeof(struct icmpv6_mib)) < 0)
272 goto err_icmp;
273 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
274 sizeof(struct icmpv6msg_mib)) < 0)
275 goto err_icmpmsg;
276
277 return 0;
278
279 err_icmpmsg:
280 snmp_mib_free((void **)idev->stats.icmpv6);
281 err_icmp:
282 snmp_mib_free((void **)idev->stats.ipv6);
283 err_ip:
284 return -ENOMEM;
285 }
286
287 static void snmp6_free_dev(struct inet6_dev *idev)
288 {
289 snmp_mib_free((void **)idev->stats.icmpv6msg);
290 snmp_mib_free((void **)idev->stats.icmpv6);
291 snmp_mib_free((void **)idev->stats.ipv6);
292 }
293
294 /* Nobody refers to this device, we may destroy it. */
295
296 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
297 {
298 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
299 kfree(idev);
300 }
301
302 void in6_dev_finish_destroy(struct inet6_dev *idev)
303 {
304 struct net_device *dev = idev->dev;
305 BUG_TRAP(idev->addr_list==NULL);
306 BUG_TRAP(idev->mc_list==NULL);
307 #ifdef NET_REFCNT_DEBUG
308 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
309 #endif
310 dev_put(dev);
311 if (!idev->dead) {
312 printk("Freeing alive inet6 device %p\n", idev);
313 return;
314 }
315 snmp6_free_dev(idev);
316 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
317 }
318
319 EXPORT_SYMBOL(in6_dev_finish_destroy);
320
321 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
322 {
323 struct inet6_dev *ndev;
324 struct in6_addr maddr;
325
326 ASSERT_RTNL();
327
328 if (dev->mtu < IPV6_MIN_MTU)
329 return NULL;
330
331 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
332
333 if (ndev == NULL)
334 return NULL;
335
336 rwlock_init(&ndev->lock);
337 ndev->dev = dev;
338 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
339 ndev->cnf.mtu6 = dev->mtu;
340 ndev->cnf.sysctl = NULL;
341 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
342 if (ndev->nd_parms == NULL) {
343 kfree(ndev);
344 return NULL;
345 }
346 /* We refer to the device */
347 dev_hold(dev);
348
349 if (snmp6_alloc_dev(ndev) < 0) {
350 ADBG((KERN_WARNING
351 "%s(): cannot allocate memory for statistics; dev=%s.\n",
352 __func__, dev->name));
353 neigh_parms_release(&nd_tbl, ndev->nd_parms);
354 ndev->dead = 1;
355 in6_dev_finish_destroy(ndev);
356 return NULL;
357 }
358
359 if (snmp6_register_dev(ndev) < 0) {
360 ADBG((KERN_WARNING
361 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
362 __func__, dev->name));
363 neigh_parms_release(&nd_tbl, ndev->nd_parms);
364 ndev->dead = 1;
365 in6_dev_finish_destroy(ndev);
366 return NULL;
367 }
368
369 /* One reference from device. We must do this before
370 * we invoke __ipv6_regen_rndid().
371 */
372 in6_dev_hold(ndev);
373
374 #ifdef CONFIG_IPV6_PRIVACY
375 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
376 if ((dev->flags&IFF_LOOPBACK) ||
377 dev->type == ARPHRD_TUNNEL ||
378 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
379 dev->type == ARPHRD_SIT ||
380 #endif
381 dev->type == ARPHRD_NONE) {
382 printk(KERN_INFO
383 "%s: Disabled Privacy Extensions\n",
384 dev->name);
385 ndev->cnf.use_tempaddr = -1;
386
387 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
388 printk(KERN_INFO
389 "%s: Disabled Multicast RS\n",
390 dev->name);
391 ndev->cnf.rtr_solicits = 0;
392 }
393 } else {
394 in6_dev_hold(ndev);
395 ipv6_regen_rndid((unsigned long) ndev);
396 }
397 #endif
398
399 if (netif_running(dev) && addrconf_qdisc_ok(dev))
400 ndev->if_flags |= IF_READY;
401
402 ipv6_mc_init_dev(ndev);
403 ndev->tstamp = jiffies;
404 addrconf_sysctl_register(ndev);
405 /* protected by rtnl_lock */
406 rcu_assign_pointer(dev->ip6_ptr, ndev);
407
408 /* Join all-node multicast group */
409 ipv6_addr_all_nodes(&maddr);
410 ipv6_dev_mc_inc(dev, &maddr);
411
412 return ndev;
413 }
414
415 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
416 {
417 struct inet6_dev *idev;
418
419 ASSERT_RTNL();
420
421 if ((idev = __in6_dev_get(dev)) == NULL) {
422 if ((idev = ipv6_add_dev(dev)) == NULL)
423 return NULL;
424 }
425
426 if (dev->flags&IFF_UP)
427 ipv6_mc_up(idev);
428 return idev;
429 }
430
431 #ifdef CONFIG_SYSCTL
432 static void dev_forward_change(struct inet6_dev *idev)
433 {
434 struct net_device *dev;
435 struct inet6_ifaddr *ifa;
436 struct in6_addr addr;
437
438 if (!idev)
439 return;
440 dev = idev->dev;
441 if (dev && (dev->flags & IFF_MULTICAST)) {
442 ipv6_addr_all_routers(&addr);
443
444 if (idev->cnf.forwarding)
445 ipv6_dev_mc_inc(dev, &addr);
446 else
447 ipv6_dev_mc_dec(dev, &addr);
448 }
449 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
450 if (ifa->flags&IFA_F_TENTATIVE)
451 continue;
452 if (idev->cnf.forwarding)
453 addrconf_join_anycast(ifa);
454 else
455 addrconf_leave_anycast(ifa);
456 }
457 }
458
459
460 static void addrconf_forward_change(struct net *net, __s32 newf)
461 {
462 struct net_device *dev;
463 struct inet6_dev *idev;
464
465 read_lock(&dev_base_lock);
466 for_each_netdev(net, dev) {
467 rcu_read_lock();
468 idev = __in6_dev_get(dev);
469 if (idev) {
470 int changed = (!idev->cnf.forwarding) ^ (!newf);
471 idev->cnf.forwarding = newf;
472 if (changed)
473 dev_forward_change(idev);
474 }
475 rcu_read_unlock();
476 }
477 read_unlock(&dev_base_lock);
478 }
479
480 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
481 {
482 struct net *net;
483
484 net = (struct net *)table->extra2;
485 if (p == &net->ipv6.devconf_dflt->forwarding)
486 return;
487
488 if (p == &net->ipv6.devconf_all->forwarding) {
489 __s32 newf = net->ipv6.devconf_all->forwarding;
490 net->ipv6.devconf_dflt->forwarding = newf;
491 addrconf_forward_change(net, newf);
492 } else if ((!*p) ^ (!old))
493 dev_forward_change((struct inet6_dev *)table->extra1);
494
495 if (*p)
496 rt6_purge_dflt_routers(net);
497 }
498 #endif
499
500 /* Nobody refers to this ifaddr, destroy it */
501
502 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
503 {
504 BUG_TRAP(ifp->if_next==NULL);
505 BUG_TRAP(ifp->lst_next==NULL);
506 #ifdef NET_REFCNT_DEBUG
507 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
508 #endif
509
510 in6_dev_put(ifp->idev);
511
512 if (del_timer(&ifp->timer))
513 printk("Timer is still running, when freeing ifa=%p\n", ifp);
514
515 if (!ifp->dead) {
516 printk("Freeing alive inet6 address %p\n", ifp);
517 return;
518 }
519 dst_release(&ifp->rt->u.dst);
520
521 kfree(ifp);
522 }
523
524 static void
525 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
526 {
527 struct inet6_ifaddr *ifa, **ifap;
528 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
529
530 /*
531 * Each device address list is sorted in order of scope -
532 * global before linklocal.
533 */
534 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
535 ifap = &ifa->if_next) {
536 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
537 break;
538 }
539
540 ifp->if_next = *ifap;
541 *ifap = ifp;
542 }
543
544 /* On success it returns ifp with increased reference count */
545
546 static struct inet6_ifaddr *
547 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
548 int scope, u32 flags)
549 {
550 struct inet6_ifaddr *ifa = NULL;
551 struct rt6_info *rt;
552 int hash;
553 int err = 0;
554
555 rcu_read_lock_bh();
556 if (idev->dead) {
557 err = -ENODEV; /*XXX*/
558 goto out2;
559 }
560
561 write_lock(&addrconf_hash_lock);
562
563 /* Ignore adding duplicate addresses on an interface */
564 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
565 ADBG(("ipv6_add_addr: already assigned\n"));
566 err = -EEXIST;
567 goto out;
568 }
569
570 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
571
572 if (ifa == NULL) {
573 ADBG(("ipv6_add_addr: malloc failed\n"));
574 err = -ENOBUFS;
575 goto out;
576 }
577
578 rt = addrconf_dst_alloc(idev, addr, 0);
579 if (IS_ERR(rt)) {
580 err = PTR_ERR(rt);
581 goto out;
582 }
583
584 ipv6_addr_copy(&ifa->addr, addr);
585
586 spin_lock_init(&ifa->lock);
587 init_timer(&ifa->timer);
588 ifa->timer.data = (unsigned long) ifa;
589 ifa->scope = scope;
590 ifa->prefix_len = pfxlen;
591 ifa->flags = flags | IFA_F_TENTATIVE;
592 ifa->cstamp = ifa->tstamp = jiffies;
593
594 ifa->rt = rt;
595
596 /*
597 * part one of RFC 4429, section 3.3
598 * We should not configure an address as
599 * optimistic if we do not yet know the link
600 * layer address of our nexhop router
601 */
602
603 if (rt->rt6i_nexthop == NULL)
604 ifa->flags &= ~IFA_F_OPTIMISTIC;
605
606 ifa->idev = idev;
607 in6_dev_hold(idev);
608 /* For caller */
609 in6_ifa_hold(ifa);
610
611 /* Add to big hash table */
612 hash = ipv6_addr_hash(addr);
613
614 ifa->lst_next = inet6_addr_lst[hash];
615 inet6_addr_lst[hash] = ifa;
616 in6_ifa_hold(ifa);
617 write_unlock(&addrconf_hash_lock);
618
619 write_lock(&idev->lock);
620 /* Add to inet6_dev unicast addr list. */
621 ipv6_link_dev_addr(idev, ifa);
622
623 #ifdef CONFIG_IPV6_PRIVACY
624 if (ifa->flags&IFA_F_TEMPORARY) {
625 ifa->tmp_next = idev->tempaddr_list;
626 idev->tempaddr_list = ifa;
627 in6_ifa_hold(ifa);
628 }
629 #endif
630
631 in6_ifa_hold(ifa);
632 write_unlock(&idev->lock);
633 out2:
634 rcu_read_unlock_bh();
635
636 if (likely(err == 0))
637 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
638 else {
639 kfree(ifa);
640 ifa = ERR_PTR(err);
641 }
642
643 return ifa;
644 out:
645 write_unlock(&addrconf_hash_lock);
646 goto out2;
647 }
648
649 /* This function wants to get referenced ifp and releases it before return */
650
651 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
652 {
653 struct inet6_ifaddr *ifa, **ifap;
654 struct inet6_dev *idev = ifp->idev;
655 int hash;
656 int deleted = 0, onlink = 0;
657 unsigned long expires = jiffies;
658
659 hash = ipv6_addr_hash(&ifp->addr);
660
661 ifp->dead = 1;
662
663 write_lock_bh(&addrconf_hash_lock);
664 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
665 ifap = &ifa->lst_next) {
666 if (ifa == ifp) {
667 *ifap = ifa->lst_next;
668 __in6_ifa_put(ifp);
669 ifa->lst_next = NULL;
670 break;
671 }
672 }
673 write_unlock_bh(&addrconf_hash_lock);
674
675 write_lock_bh(&idev->lock);
676 #ifdef CONFIG_IPV6_PRIVACY
677 if (ifp->flags&IFA_F_TEMPORARY) {
678 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
679 ifap = &ifa->tmp_next) {
680 if (ifa == ifp) {
681 *ifap = ifa->tmp_next;
682 if (ifp->ifpub) {
683 in6_ifa_put(ifp->ifpub);
684 ifp->ifpub = NULL;
685 }
686 __in6_ifa_put(ifp);
687 ifa->tmp_next = NULL;
688 break;
689 }
690 }
691 }
692 #endif
693
694 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
695 if (ifa == ifp) {
696 *ifap = ifa->if_next;
697 __in6_ifa_put(ifp);
698 ifa->if_next = NULL;
699 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
700 break;
701 deleted = 1;
702 continue;
703 } else if (ifp->flags & IFA_F_PERMANENT) {
704 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
705 ifp->prefix_len)) {
706 if (ifa->flags & IFA_F_PERMANENT) {
707 onlink = 1;
708 if (deleted)
709 break;
710 } else {
711 unsigned long lifetime;
712
713 if (!onlink)
714 onlink = -1;
715
716 spin_lock(&ifa->lock);
717 lifetime = min_t(unsigned long,
718 ifa->valid_lft, 0x7fffffffUL/HZ);
719 if (time_before(expires,
720 ifa->tstamp + lifetime * HZ))
721 expires = ifa->tstamp + lifetime * HZ;
722 spin_unlock(&ifa->lock);
723 }
724 }
725 }
726 ifap = &ifa->if_next;
727 }
728 write_unlock_bh(&idev->lock);
729
730 ipv6_ifa_notify(RTM_DELADDR, ifp);
731
732 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
733
734 addrconf_del_timer(ifp);
735
736 /*
737 * Purge or update corresponding prefix
738 *
739 * 1) we don't purge prefix here if address was not permanent.
740 * prefix is managed by its own lifetime.
741 * 2) if there're no addresses, delete prefix.
742 * 3) if there're still other permanent address(es),
743 * corresponding prefix is still permanent.
744 * 4) otherwise, update prefix lifetime to the
745 * longest valid lifetime among the corresponding
746 * addresses on the device.
747 * Note: subsequent RA will update lifetime.
748 *
749 * --yoshfuji
750 */
751 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
752 struct in6_addr prefix;
753 struct rt6_info *rt;
754 struct net *net = dev_net(ifp->idev->dev);
755 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
756 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
757
758 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
759 if (onlink == 0) {
760 ip6_del_rt(rt);
761 rt = NULL;
762 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
763 rt->rt6i_expires = expires;
764 rt->rt6i_flags |= RTF_EXPIRES;
765 }
766 }
767 dst_release(&rt->u.dst);
768 }
769
770 in6_ifa_put(ifp);
771 }
772
773 #ifdef CONFIG_IPV6_PRIVACY
774 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
775 {
776 struct inet6_dev *idev = ifp->idev;
777 struct in6_addr addr, *tmpaddr;
778 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
779 int tmp_plen;
780 int ret = 0;
781 int max_addresses;
782 u32 addr_flags;
783
784 write_lock(&idev->lock);
785 if (ift) {
786 spin_lock_bh(&ift->lock);
787 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
788 spin_unlock_bh(&ift->lock);
789 tmpaddr = &addr;
790 } else {
791 tmpaddr = NULL;
792 }
793 retry:
794 in6_dev_hold(idev);
795 if (idev->cnf.use_tempaddr <= 0) {
796 write_unlock(&idev->lock);
797 printk(KERN_INFO
798 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
799 in6_dev_put(idev);
800 ret = -1;
801 goto out;
802 }
803 spin_lock_bh(&ifp->lock);
804 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
805 idev->cnf.use_tempaddr = -1; /*XXX*/
806 spin_unlock_bh(&ifp->lock);
807 write_unlock(&idev->lock);
808 printk(KERN_WARNING
809 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
810 in6_dev_put(idev);
811 ret = -1;
812 goto out;
813 }
814 in6_ifa_hold(ifp);
815 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
816 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
817 spin_unlock_bh(&ifp->lock);
818 write_unlock(&idev->lock);
819 printk(KERN_WARNING
820 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
821 in6_ifa_put(ifp);
822 in6_dev_put(idev);
823 ret = -1;
824 goto out;
825 }
826 memcpy(&addr.s6_addr[8], idev->rndid, 8);
827 tmp_valid_lft = min_t(__u32,
828 ifp->valid_lft,
829 idev->cnf.temp_valid_lft);
830 tmp_prefered_lft = min_t(__u32,
831 ifp->prefered_lft,
832 idev->cnf.temp_prefered_lft - desync_factor / HZ);
833 tmp_plen = ifp->prefix_len;
834 max_addresses = idev->cnf.max_addresses;
835 tmp_cstamp = ifp->cstamp;
836 tmp_tstamp = ifp->tstamp;
837 spin_unlock_bh(&ifp->lock);
838
839 write_unlock(&idev->lock);
840
841 addr_flags = IFA_F_TEMPORARY;
842 /* set in addrconf_prefix_rcv() */
843 if (ifp->flags & IFA_F_OPTIMISTIC)
844 addr_flags |= IFA_F_OPTIMISTIC;
845
846 ift = !max_addresses ||
847 ipv6_count_addresses(idev) < max_addresses ?
848 ipv6_add_addr(idev, &addr, tmp_plen,
849 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
850 addr_flags) : NULL;
851 if (!ift || IS_ERR(ift)) {
852 in6_ifa_put(ifp);
853 in6_dev_put(idev);
854 printk(KERN_INFO
855 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
856 tmpaddr = &addr;
857 write_lock(&idev->lock);
858 goto retry;
859 }
860
861 spin_lock_bh(&ift->lock);
862 ift->ifpub = ifp;
863 ift->valid_lft = tmp_valid_lft;
864 ift->prefered_lft = tmp_prefered_lft;
865 ift->cstamp = tmp_cstamp;
866 ift->tstamp = tmp_tstamp;
867 spin_unlock_bh(&ift->lock);
868
869 addrconf_dad_start(ift, 0);
870 in6_ifa_put(ift);
871 in6_dev_put(idev);
872 out:
873 return ret;
874 }
875 #endif
876
877 /*
878 * Choose an appropriate source address (RFC3484)
879 */
880 enum {
881 IPV6_SADDR_RULE_INIT = 0,
882 IPV6_SADDR_RULE_LOCAL,
883 IPV6_SADDR_RULE_SCOPE,
884 IPV6_SADDR_RULE_PREFERRED,
885 #ifdef CONFIG_IPV6_MIP6
886 IPV6_SADDR_RULE_HOA,
887 #endif
888 IPV6_SADDR_RULE_OIF,
889 IPV6_SADDR_RULE_LABEL,
890 #ifdef CONFIG_IPV6_PRIVACY
891 IPV6_SADDR_RULE_PRIVACY,
892 #endif
893 IPV6_SADDR_RULE_ORCHID,
894 IPV6_SADDR_RULE_PREFIX,
895 IPV6_SADDR_RULE_MAX
896 };
897
898 struct ipv6_saddr_score {
899 int rule;
900 int addr_type;
901 struct inet6_ifaddr *ifa;
902 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
903 int scopedist;
904 int matchlen;
905 };
906
907 struct ipv6_saddr_dst {
908 struct in6_addr *addr;
909 int ifindex;
910 int scope;
911 int label;
912 unsigned int prefs;
913 };
914
915 static inline int ipv6_saddr_preferred(int type)
916 {
917 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
918 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
919 return 1;
920 return 0;
921 }
922
923 static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score,
924 struct ipv6_saddr_dst *dst,
925 int i)
926 {
927 int ret;
928
929 if (i <= score->rule) {
930 switch (i) {
931 case IPV6_SADDR_RULE_SCOPE:
932 ret = score->scopedist;
933 break;
934 case IPV6_SADDR_RULE_PREFIX:
935 ret = score->matchlen;
936 break;
937 default:
938 ret = !!test_bit(i, score->scorebits);
939 }
940 goto out;
941 }
942
943 switch (i) {
944 case IPV6_SADDR_RULE_INIT:
945 /* Rule 0: remember if hiscore is not ready yet */
946 ret = !!score->ifa;
947 break;
948 case IPV6_SADDR_RULE_LOCAL:
949 /* Rule 1: Prefer same address */
950 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
951 break;
952 case IPV6_SADDR_RULE_SCOPE:
953 /* Rule 2: Prefer appropriate scope
954 *
955 * ret
956 * ^
957 * -1 | d 15
958 * ---+--+-+---> scope
959 * |
960 * | d is scope of the destination.
961 * B-d | \
962 * | \ <- smaller scope is better if
963 * B-15 | \ if scope is enough for destinaion.
964 * | ret = B - scope (-1 <= scope >= d <= 15).
965 * d-C-1 | /
966 * |/ <- greater is better
967 * -C / if scope is not enough for destination.
968 * /| ret = scope - C (-1 <= d < scope <= 15).
969 *
970 * d - C - 1 < B -15 (for all -1 <= d <= 15).
971 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
972 * Assume B = 0 and we get C > 29.
973 */
974 ret = __ipv6_addr_src_scope(score->addr_type);
975 if (ret >= dst->scope)
976 ret = -ret;
977 else
978 ret -= 128; /* 30 is enough */
979 score->scopedist = ret;
980 break;
981 case IPV6_SADDR_RULE_PREFERRED:
982 /* Rule 3: Avoid deprecated and optimistic addresses */
983 ret = ipv6_saddr_preferred(score->addr_type) ||
984 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
985 break;
986 #ifdef CONFIG_IPV6_MIP6
987 case IPV6_SADDR_RULE_HOA:
988 {
989 /* Rule 4: Prefer home address */
990 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
991 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
992 break;
993 }
994 #endif
995 case IPV6_SADDR_RULE_OIF:
996 /* Rule 5: Prefer outgoing interface */
997 ret = (!dst->ifindex ||
998 dst->ifindex == score->ifa->idev->dev->ifindex);
999 break;
1000 case IPV6_SADDR_RULE_LABEL:
1001 /* Rule 6: Prefer matching label */
1002 ret = ipv6_addr_label(&score->ifa->addr, score->addr_type,
1003 score->ifa->idev->dev->ifindex) == dst->label;
1004 break;
1005 #ifdef CONFIG_IPV6_PRIVACY
1006 case IPV6_SADDR_RULE_PRIVACY:
1007 {
1008 /* Rule 7: Prefer public address
1009 * Note: prefer temprary address if use_tempaddr >= 2
1010 */
1011 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1012 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1013 score->ifa->idev->cnf.use_tempaddr >= 2;
1014 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1015 break;
1016 }
1017 #endif
1018 case IPV6_SADDR_RULE_ORCHID:
1019 /* Rule 8-: Prefer ORCHID vs ORCHID or
1020 * non-ORCHID vs non-ORCHID
1021 */
1022 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1023 ipv6_addr_orchid(dst->addr));
1024 break;
1025 case IPV6_SADDR_RULE_PREFIX:
1026 /* Rule 8: Use longest matching prefix */
1027 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1028 dst->addr);
1029 break;
1030 default:
1031 ret = 0;
1032 }
1033
1034 if (ret)
1035 __set_bit(i, score->scorebits);
1036 score->rule = i;
1037 out:
1038 return ret;
1039 }
1040
1041 int ipv6_dev_get_saddr(struct net_device *dst_dev,
1042 struct in6_addr *daddr, unsigned int prefs,
1043 struct in6_addr *saddr)
1044 {
1045 struct ipv6_saddr_score scores[2],
1046 *score = &scores[0], *hiscore = &scores[1];
1047 struct net *net = dev_net(dst_dev);
1048 struct ipv6_saddr_dst dst;
1049 struct net_device *dev;
1050 int dst_type;
1051
1052 dst_type = __ipv6_addr_type(daddr);
1053 dst.addr = daddr;
1054 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1055 dst.scope = __ipv6_addr_src_scope(dst_type);
1056 dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex);
1057 dst.prefs = prefs;
1058
1059 hiscore->rule = -1;
1060 hiscore->ifa = NULL;
1061
1062 read_lock(&dev_base_lock);
1063 rcu_read_lock();
1064
1065 for_each_netdev(net, dev) {
1066 struct inet6_dev *idev;
1067
1068 /* Candidate Source Address (section 4)
1069 * - multicast and link-local destination address,
1070 * the set of candidate source address MUST only
1071 * include addresses assigned to interfaces
1072 * belonging to the same link as the outgoing
1073 * interface.
1074 * (- For site-local destination addresses, the
1075 * set of candidate source addresses MUST only
1076 * include addresses assigned to interfaces
1077 * belonging to the same site as the outgoing
1078 * interface.)
1079 */
1080 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1081 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1082 dst.ifindex && dev->ifindex != dst.ifindex)
1083 continue;
1084
1085 idev = __in6_dev_get(dev);
1086 if (!idev)
1087 continue;
1088
1089 read_lock_bh(&idev->lock);
1090 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1091 int i;
1092
1093 /*
1094 * - Tentative Address (RFC2462 section 5.4)
1095 * - A tentative address is not considered
1096 * "assigned to an interface" in the traditional
1097 * sense, unless it is also flagged as optimistic.
1098 * - Candidate Source Address (section 4)
1099 * - In any case, anycast addresses, multicast
1100 * addresses, and the unspecified address MUST
1101 * NOT be included in a candidate set.
1102 */
1103 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1104 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1105 continue;
1106
1107 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1108
1109 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1110 score->addr_type & IPV6_ADDR_MULTICAST)) {
1111 LIMIT_NETDEBUG(KERN_DEBUG
1112 "ADDRCONF: unspecified / multicast address "
1113 "assigned as unicast address on %s",
1114 dev->name);
1115 continue;
1116 }
1117
1118 score->rule = -1;
1119 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1120
1121 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1122 int minihiscore, miniscore;
1123
1124 minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i);
1125 miniscore = ipv6_get_saddr_eval(score, &dst, i);
1126
1127 if (minihiscore > miniscore) {
1128 if (i == IPV6_SADDR_RULE_SCOPE &&
1129 score->scopedist > 0) {
1130 /*
1131 * special case:
1132 * each remaining entry
1133 * has too small (not enough)
1134 * scope, because ifa entries
1135 * are sorted by their scope
1136 * values.
1137 */
1138 goto try_nextdev;
1139 }
1140 break;
1141 } else if (minihiscore < miniscore) {
1142 struct ipv6_saddr_score *tmp;
1143
1144 if (hiscore->ifa)
1145 in6_ifa_put(hiscore->ifa);
1146
1147 in6_ifa_hold(score->ifa);
1148
1149 tmp = hiscore;
1150 hiscore = score;
1151 score = tmp;
1152
1153 /* restore our iterator */
1154 score->ifa = hiscore->ifa;
1155
1156 break;
1157 }
1158 }
1159 }
1160 try_nextdev:
1161 read_unlock_bh(&idev->lock);
1162 }
1163 rcu_read_unlock();
1164 read_unlock(&dev_base_lock);
1165
1166 if (!hiscore->ifa)
1167 return -EADDRNOTAVAIL;
1168
1169 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1170 in6_ifa_put(hiscore->ifa);
1171 return 0;
1172 }
1173
1174 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1175
1176 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1177 unsigned char banned_flags)
1178 {
1179 struct inet6_dev *idev;
1180 int err = -EADDRNOTAVAIL;
1181
1182 rcu_read_lock();
1183 if ((idev = __in6_dev_get(dev)) != NULL) {
1184 struct inet6_ifaddr *ifp;
1185
1186 read_lock_bh(&idev->lock);
1187 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1188 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1189 ipv6_addr_copy(addr, &ifp->addr);
1190 err = 0;
1191 break;
1192 }
1193 }
1194 read_unlock_bh(&idev->lock);
1195 }
1196 rcu_read_unlock();
1197 return err;
1198 }
1199
1200 static int ipv6_count_addresses(struct inet6_dev *idev)
1201 {
1202 int cnt = 0;
1203 struct inet6_ifaddr *ifp;
1204
1205 read_lock_bh(&idev->lock);
1206 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1207 cnt++;
1208 read_unlock_bh(&idev->lock);
1209 return cnt;
1210 }
1211
1212 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1213 struct net_device *dev, int strict)
1214 {
1215 struct inet6_ifaddr * ifp;
1216 u8 hash = ipv6_addr_hash(addr);
1217
1218 read_lock_bh(&addrconf_hash_lock);
1219 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1220 if (!net_eq(dev_net(ifp->idev->dev), net))
1221 continue;
1222 if (ipv6_addr_equal(&ifp->addr, addr) &&
1223 !(ifp->flags&IFA_F_TENTATIVE)) {
1224 if (dev == NULL || ifp->idev->dev == dev ||
1225 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1226 break;
1227 }
1228 }
1229 read_unlock_bh(&addrconf_hash_lock);
1230 return ifp != NULL;
1231 }
1232 EXPORT_SYMBOL(ipv6_chk_addr);
1233
1234 static
1235 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1236 struct net_device *dev)
1237 {
1238 struct inet6_ifaddr * ifp;
1239 u8 hash = ipv6_addr_hash(addr);
1240
1241 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1242 if (!net_eq(dev_net(ifp->idev->dev), net))
1243 continue;
1244 if (ipv6_addr_equal(&ifp->addr, addr)) {
1245 if (dev == NULL || ifp->idev->dev == dev)
1246 break;
1247 }
1248 }
1249 return ifp != NULL;
1250 }
1251
1252 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1253 struct net_device *dev, int strict)
1254 {
1255 struct inet6_ifaddr * ifp;
1256 u8 hash = ipv6_addr_hash(addr);
1257
1258 read_lock_bh(&addrconf_hash_lock);
1259 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1260 if (!net_eq(dev_net(ifp->idev->dev), net))
1261 continue;
1262 if (ipv6_addr_equal(&ifp->addr, addr)) {
1263 if (dev == NULL || ifp->idev->dev == dev ||
1264 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1265 in6_ifa_hold(ifp);
1266 break;
1267 }
1268 }
1269 }
1270 read_unlock_bh(&addrconf_hash_lock);
1271
1272 return ifp;
1273 }
1274
1275 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1276 {
1277 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1278 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1279 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1280 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1281 int sk_ipv6only = ipv6_only_sock(sk);
1282 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1283 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1284 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1285
1286 if (!sk2_rcv_saddr && !sk_ipv6only)
1287 return 1;
1288
1289 if (addr_type2 == IPV6_ADDR_ANY &&
1290 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1291 return 1;
1292
1293 if (addr_type == IPV6_ADDR_ANY &&
1294 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1295 return 1;
1296
1297 if (sk2_rcv_saddr6 &&
1298 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1299 return 1;
1300
1301 if (addr_type == IPV6_ADDR_MAPPED &&
1302 !sk2_ipv6only &&
1303 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1304 return 1;
1305
1306 return 0;
1307 }
1308
1309 /* Gets referenced address, destroys ifaddr */
1310
1311 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1312 {
1313 if (ifp->flags&IFA_F_PERMANENT) {
1314 spin_lock_bh(&ifp->lock);
1315 addrconf_del_timer(ifp);
1316 ifp->flags |= IFA_F_TENTATIVE;
1317 spin_unlock_bh(&ifp->lock);
1318 in6_ifa_put(ifp);
1319 #ifdef CONFIG_IPV6_PRIVACY
1320 } else if (ifp->flags&IFA_F_TEMPORARY) {
1321 struct inet6_ifaddr *ifpub;
1322 spin_lock_bh(&ifp->lock);
1323 ifpub = ifp->ifpub;
1324 if (ifpub) {
1325 in6_ifa_hold(ifpub);
1326 spin_unlock_bh(&ifp->lock);
1327 ipv6_create_tempaddr(ifpub, ifp);
1328 in6_ifa_put(ifpub);
1329 } else {
1330 spin_unlock_bh(&ifp->lock);
1331 }
1332 ipv6_del_addr(ifp);
1333 #endif
1334 } else
1335 ipv6_del_addr(ifp);
1336 }
1337
1338 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1339 {
1340 if (net_ratelimit())
1341 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1342 addrconf_dad_stop(ifp);
1343 }
1344
1345 /* Join to solicited addr multicast group. */
1346
1347 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1348 {
1349 struct in6_addr maddr;
1350
1351 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1352 return;
1353
1354 addrconf_addr_solict_mult(addr, &maddr);
1355 ipv6_dev_mc_inc(dev, &maddr);
1356 }
1357
1358 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1359 {
1360 struct in6_addr maddr;
1361
1362 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1363 return;
1364
1365 addrconf_addr_solict_mult(addr, &maddr);
1366 __ipv6_dev_mc_dec(idev, &maddr);
1367 }
1368
1369 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1370 {
1371 struct in6_addr addr;
1372 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1373 if (ipv6_addr_any(&addr))
1374 return;
1375 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1376 }
1377
1378 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1379 {
1380 struct in6_addr addr;
1381 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1382 if (ipv6_addr_any(&addr))
1383 return;
1384 __ipv6_dev_ac_dec(ifp->idev, &addr);
1385 }
1386
1387 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1388 {
1389 if (dev->addr_len != ETH_ALEN)
1390 return -1;
1391 memcpy(eui, dev->dev_addr, 3);
1392 memcpy(eui + 5, dev->dev_addr + 3, 3);
1393
1394 /*
1395 * The zSeries OSA network cards can be shared among various
1396 * OS instances, but the OSA cards have only one MAC address.
1397 * This leads to duplicate address conflicts in conjunction
1398 * with IPv6 if more than one instance uses the same card.
1399 *
1400 * The driver for these cards can deliver a unique 16-bit
1401 * identifier for each instance sharing the same card. It is
1402 * placed instead of 0xFFFE in the interface identifier. The
1403 * "u" bit of the interface identifier is not inverted in this
1404 * case. Hence the resulting interface identifier has local
1405 * scope according to RFC2373.
1406 */
1407 if (dev->dev_id) {
1408 eui[3] = (dev->dev_id >> 8) & 0xFF;
1409 eui[4] = dev->dev_id & 0xFF;
1410 } else {
1411 eui[3] = 0xFF;
1412 eui[4] = 0xFE;
1413 eui[0] ^= 2;
1414 }
1415 return 0;
1416 }
1417
1418 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1419 {
1420 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1421 if (dev->addr_len != ARCNET_ALEN)
1422 return -1;
1423 memset(eui, 0, 7);
1424 eui[7] = *(u8*)dev->dev_addr;
1425 return 0;
1426 }
1427
1428 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1429 {
1430 if (dev->addr_len != INFINIBAND_ALEN)
1431 return -1;
1432 memcpy(eui, dev->dev_addr + 12, 8);
1433 eui[0] |= 2;
1434 return 0;
1435 }
1436
1437 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1438 {
1439 switch (dev->type) {
1440 case ARPHRD_ETHER:
1441 case ARPHRD_FDDI:
1442 case ARPHRD_IEEE802_TR:
1443 return addrconf_ifid_eui48(eui, dev);
1444 case ARPHRD_ARCNET:
1445 return addrconf_ifid_arcnet(eui, dev);
1446 case ARPHRD_INFINIBAND:
1447 return addrconf_ifid_infiniband(eui, dev);
1448 case ARPHRD_SIT:
1449 if (dev->priv_flags & IFF_ISATAP)
1450 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1451 }
1452 return -1;
1453 }
1454
1455 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1456 {
1457 int err = -1;
1458 struct inet6_ifaddr *ifp;
1459
1460 read_lock_bh(&idev->lock);
1461 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1462 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1463 memcpy(eui, ifp->addr.s6_addr+8, 8);
1464 err = 0;
1465 break;
1466 }
1467 }
1468 read_unlock_bh(&idev->lock);
1469 return err;
1470 }
1471
1472 #ifdef CONFIG_IPV6_PRIVACY
1473 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1474 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1475 {
1476 regen:
1477 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1478 idev->rndid[0] &= ~0x02;
1479
1480 /*
1481 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1482 * check if generated address is not inappropriate
1483 *
1484 * - Reserved subnet anycast (RFC 2526)
1485 * 11111101 11....11 1xxxxxxx
1486 * - ISATAP (RFC4214) 6.1
1487 * 00-00-5E-FE-xx-xx-xx-xx
1488 * - value 0
1489 * - XXX: already assigned to an address on the device
1490 */
1491 if (idev->rndid[0] == 0xfd &&
1492 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1493 (idev->rndid[7]&0x80))
1494 goto regen;
1495 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1496 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1497 goto regen;
1498 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1499 goto regen;
1500 }
1501
1502 return 0;
1503 }
1504
1505 static void ipv6_regen_rndid(unsigned long data)
1506 {
1507 struct inet6_dev *idev = (struct inet6_dev *) data;
1508 unsigned long expires;
1509
1510 rcu_read_lock_bh();
1511 write_lock_bh(&idev->lock);
1512
1513 if (idev->dead)
1514 goto out;
1515
1516 if (__ipv6_regen_rndid(idev) < 0)
1517 goto out;
1518
1519 expires = jiffies +
1520 idev->cnf.temp_prefered_lft * HZ -
1521 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1522 if (time_before(expires, jiffies)) {
1523 printk(KERN_WARNING
1524 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1525 idev->dev->name);
1526 goto out;
1527 }
1528
1529 if (!mod_timer(&idev->regen_timer, expires))
1530 in6_dev_hold(idev);
1531
1532 out:
1533 write_unlock_bh(&idev->lock);
1534 rcu_read_unlock_bh();
1535 in6_dev_put(idev);
1536 }
1537
1538 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1539 int ret = 0;
1540
1541 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1542 ret = __ipv6_regen_rndid(idev);
1543 return ret;
1544 }
1545 #endif
1546
1547 /*
1548 * Add prefix route.
1549 */
1550
1551 static void
1552 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1553 unsigned long expires, u32 flags)
1554 {
1555 struct fib6_config cfg = {
1556 .fc_table = RT6_TABLE_PREFIX,
1557 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1558 .fc_ifindex = dev->ifindex,
1559 .fc_expires = expires,
1560 .fc_dst_len = plen,
1561 .fc_flags = RTF_UP | flags,
1562 .fc_nlinfo.nl_net = dev_net(dev),
1563 };
1564
1565 ipv6_addr_copy(&cfg.fc_dst, pfx);
1566
1567 /* Prevent useless cloning on PtP SIT.
1568 This thing is done here expecting that the whole
1569 class of non-broadcast devices need not cloning.
1570 */
1571 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1572 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1573 cfg.fc_flags |= RTF_NONEXTHOP;
1574 #endif
1575
1576 ip6_route_add(&cfg);
1577 }
1578
1579 /* Create "default" multicast route to the interface */
1580
1581 static void addrconf_add_mroute(struct net_device *dev)
1582 {
1583 struct fib6_config cfg = {
1584 .fc_table = RT6_TABLE_LOCAL,
1585 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1586 .fc_ifindex = dev->ifindex,
1587 .fc_dst_len = 8,
1588 .fc_flags = RTF_UP,
1589 .fc_nlinfo.nl_net = dev_net(dev),
1590 };
1591
1592 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1593
1594 ip6_route_add(&cfg);
1595 }
1596
1597 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1598 static void sit_route_add(struct net_device *dev)
1599 {
1600 struct fib6_config cfg = {
1601 .fc_table = RT6_TABLE_MAIN,
1602 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1603 .fc_ifindex = dev->ifindex,
1604 .fc_dst_len = 96,
1605 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1606 .fc_nlinfo.nl_net = dev_net(dev),
1607 };
1608
1609 /* prefix length - 96 bits "::d.d.d.d" */
1610 ip6_route_add(&cfg);
1611 }
1612 #endif
1613
1614 static void addrconf_add_lroute(struct net_device *dev)
1615 {
1616 struct in6_addr addr;
1617
1618 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1619 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1620 }
1621
1622 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1623 {
1624 struct inet6_dev *idev;
1625
1626 ASSERT_RTNL();
1627
1628 if ((idev = ipv6_find_idev(dev)) == NULL)
1629 return NULL;
1630
1631 /* Add default multicast route */
1632 addrconf_add_mroute(dev);
1633
1634 /* Add link local route */
1635 addrconf_add_lroute(dev);
1636 return idev;
1637 }
1638
1639 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1640 {
1641 struct prefix_info *pinfo;
1642 __u32 valid_lft;
1643 __u32 prefered_lft;
1644 int addr_type;
1645 unsigned long rt_expires;
1646 struct inet6_dev *in6_dev;
1647
1648 pinfo = (struct prefix_info *) opt;
1649
1650 if (len < sizeof(struct prefix_info)) {
1651 ADBG(("addrconf: prefix option too short\n"));
1652 return;
1653 }
1654
1655 /*
1656 * Validation checks ([ADDRCONF], page 19)
1657 */
1658
1659 addr_type = ipv6_addr_type(&pinfo->prefix);
1660
1661 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1662 return;
1663
1664 valid_lft = ntohl(pinfo->valid);
1665 prefered_lft = ntohl(pinfo->prefered);
1666
1667 if (prefered_lft > valid_lft) {
1668 if (net_ratelimit())
1669 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1670 return;
1671 }
1672
1673 in6_dev = in6_dev_get(dev);
1674
1675 if (in6_dev == NULL) {
1676 if (net_ratelimit())
1677 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1678 return;
1679 }
1680
1681 /*
1682 * Two things going on here:
1683 * 1) Add routes for on-link prefixes
1684 * 2) Configure prefixes with the auto flag set
1685 */
1686
1687 /* Avoid arithmetic overflow. Really, we could
1688 save rt_expires in seconds, likely valid_lft,
1689 but it would require division in fib gc, that it
1690 not good.
1691 */
1692 if (valid_lft >= 0x7FFFFFFF/HZ)
1693 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1694 else
1695 rt_expires = valid_lft * HZ;
1696
1697 /*
1698 * We convert this (in jiffies) to clock_t later.
1699 * Avoid arithmetic overflow there as well.
1700 * Overflow can happen only if HZ < USER_HZ.
1701 */
1702 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1703 rt_expires = 0x7FFFFFFF / USER_HZ;
1704
1705 if (pinfo->onlink) {
1706 struct rt6_info *rt;
1707 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
1708 dev->ifindex, 1);
1709
1710 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1711 if (rt->rt6i_flags&RTF_EXPIRES) {
1712 if (valid_lft == 0) {
1713 ip6_del_rt(rt);
1714 rt = NULL;
1715 } else {
1716 rt->rt6i_expires = jiffies + rt_expires;
1717 }
1718 }
1719 } else if (valid_lft) {
1720 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1721 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1722 }
1723 if (rt)
1724 dst_release(&rt->u.dst);
1725 }
1726
1727 /* Try to figure out our local address for this prefix */
1728
1729 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1730 struct inet6_ifaddr * ifp;
1731 struct in6_addr addr;
1732 int create = 0, update_lft = 0;
1733
1734 if (pinfo->prefix_len == 64) {
1735 memcpy(&addr, &pinfo->prefix, 8);
1736 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1737 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1738 in6_dev_put(in6_dev);
1739 return;
1740 }
1741 goto ok;
1742 }
1743 if (net_ratelimit())
1744 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1745 pinfo->prefix_len);
1746 in6_dev_put(in6_dev);
1747 return;
1748
1749 ok:
1750
1751 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1);
1752
1753 if (ifp == NULL && valid_lft) {
1754 int max_addresses = in6_dev->cnf.max_addresses;
1755 u32 addr_flags = 0;
1756
1757 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1758 if (in6_dev->cnf.optimistic_dad &&
1759 !ipv6_devconf.forwarding)
1760 addr_flags = IFA_F_OPTIMISTIC;
1761 #endif
1762
1763 /* Do not allow to create too much of autoconfigured
1764 * addresses; this would be too easy way to crash kernel.
1765 */
1766 if (!max_addresses ||
1767 ipv6_count_addresses(in6_dev) < max_addresses)
1768 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1769 addr_type&IPV6_ADDR_SCOPE_MASK,
1770 addr_flags);
1771
1772 if (!ifp || IS_ERR(ifp)) {
1773 in6_dev_put(in6_dev);
1774 return;
1775 }
1776
1777 update_lft = create = 1;
1778 ifp->cstamp = jiffies;
1779 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1780 }
1781
1782 if (ifp) {
1783 int flags;
1784 unsigned long now;
1785 #ifdef CONFIG_IPV6_PRIVACY
1786 struct inet6_ifaddr *ift;
1787 #endif
1788 u32 stored_lft;
1789
1790 /* update lifetime (RFC2462 5.5.3 e) */
1791 spin_lock(&ifp->lock);
1792 now = jiffies;
1793 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1794 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1795 else
1796 stored_lft = 0;
1797 if (!update_lft && stored_lft) {
1798 if (valid_lft > MIN_VALID_LIFETIME ||
1799 valid_lft > stored_lft)
1800 update_lft = 1;
1801 else if (stored_lft <= MIN_VALID_LIFETIME) {
1802 /* valid_lft <= stored_lft is always true */
1803 /* XXX: IPsec */
1804 update_lft = 0;
1805 } else {
1806 valid_lft = MIN_VALID_LIFETIME;
1807 if (valid_lft < prefered_lft)
1808 prefered_lft = valid_lft;
1809 update_lft = 1;
1810 }
1811 }
1812
1813 if (update_lft) {
1814 ifp->valid_lft = valid_lft;
1815 ifp->prefered_lft = prefered_lft;
1816 ifp->tstamp = now;
1817 flags = ifp->flags;
1818 ifp->flags &= ~IFA_F_DEPRECATED;
1819 spin_unlock(&ifp->lock);
1820
1821 if (!(flags&IFA_F_TENTATIVE))
1822 ipv6_ifa_notify(0, ifp);
1823 } else
1824 spin_unlock(&ifp->lock);
1825
1826 #ifdef CONFIG_IPV6_PRIVACY
1827 read_lock_bh(&in6_dev->lock);
1828 /* update all temporary addresses in the list */
1829 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1830 /*
1831 * When adjusting the lifetimes of an existing
1832 * temporary address, only lower the lifetimes.
1833 * Implementations must not increase the
1834 * lifetimes of an existing temporary address
1835 * when processing a Prefix Information Option.
1836 */
1837 spin_lock(&ift->lock);
1838 flags = ift->flags;
1839 if (ift->valid_lft > valid_lft &&
1840 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1841 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1842 if (ift->prefered_lft > prefered_lft &&
1843 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1844 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1845 spin_unlock(&ift->lock);
1846 if (!(flags&IFA_F_TENTATIVE))
1847 ipv6_ifa_notify(0, ift);
1848 }
1849
1850 if (create && in6_dev->cnf.use_tempaddr > 0) {
1851 /*
1852 * When a new public address is created as described in [ADDRCONF],
1853 * also create a new temporary address.
1854 */
1855 read_unlock_bh(&in6_dev->lock);
1856 ipv6_create_tempaddr(ifp, NULL);
1857 } else {
1858 read_unlock_bh(&in6_dev->lock);
1859 }
1860 #endif
1861 in6_ifa_put(ifp);
1862 addrconf_verify(0);
1863 }
1864 }
1865 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1866 in6_dev_put(in6_dev);
1867 }
1868
1869 /*
1870 * Set destination address.
1871 * Special case for SIT interfaces where we create a new "virtual"
1872 * device.
1873 */
1874 int addrconf_set_dstaddr(struct net *net, void __user *arg)
1875 {
1876 struct in6_ifreq ireq;
1877 struct net_device *dev;
1878 int err = -EINVAL;
1879
1880 rtnl_lock();
1881
1882 err = -EFAULT;
1883 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1884 goto err_exit;
1885
1886 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1887
1888 err = -ENODEV;
1889 if (dev == NULL)
1890 goto err_exit;
1891
1892 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1893 if (dev->type == ARPHRD_SIT) {
1894 struct ifreq ifr;
1895 mm_segment_t oldfs;
1896 struct ip_tunnel_parm p;
1897
1898 err = -EADDRNOTAVAIL;
1899 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1900 goto err_exit;
1901
1902 memset(&p, 0, sizeof(p));
1903 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1904 p.iph.saddr = 0;
1905 p.iph.version = 4;
1906 p.iph.ihl = 5;
1907 p.iph.protocol = IPPROTO_IPV6;
1908 p.iph.ttl = 64;
1909 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1910
1911 oldfs = get_fs(); set_fs(KERNEL_DS);
1912 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1913 set_fs(oldfs);
1914
1915 if (err == 0) {
1916 err = -ENOBUFS;
1917 dev = __dev_get_by_name(net, p.name);
1918 if (!dev)
1919 goto err_exit;
1920 err = dev_open(dev);
1921 }
1922 }
1923 #endif
1924
1925 err_exit:
1926 rtnl_unlock();
1927 return err;
1928 }
1929
1930 /*
1931 * Manual configuration of address on an interface
1932 */
1933 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
1934 int plen, __u8 ifa_flags, __u32 prefered_lft,
1935 __u32 valid_lft)
1936 {
1937 struct inet6_ifaddr *ifp;
1938 struct inet6_dev *idev;
1939 struct net_device *dev;
1940 int scope;
1941 u32 flags = RTF_EXPIRES;
1942
1943 ASSERT_RTNL();
1944
1945 /* check the lifetime */
1946 if (!valid_lft || prefered_lft > valid_lft)
1947 return -EINVAL;
1948
1949 dev = __dev_get_by_index(net, ifindex);
1950 if (!dev)
1951 return -ENODEV;
1952
1953 if ((idev = addrconf_add_dev(dev)) == NULL)
1954 return -ENOBUFS;
1955
1956 scope = ipv6_addr_scope(pfx);
1957
1958 if (valid_lft == INFINITY_LIFE_TIME) {
1959 ifa_flags |= IFA_F_PERMANENT;
1960 flags = 0;
1961 } else if (valid_lft >= 0x7FFFFFFF/HZ)
1962 valid_lft = 0x7FFFFFFF/HZ;
1963
1964 if (prefered_lft == 0)
1965 ifa_flags |= IFA_F_DEPRECATED;
1966 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1967 (prefered_lft != INFINITY_LIFE_TIME))
1968 prefered_lft = 0x7FFFFFFF/HZ;
1969
1970 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1971
1972 if (!IS_ERR(ifp)) {
1973 spin_lock_bh(&ifp->lock);
1974 ifp->valid_lft = valid_lft;
1975 ifp->prefered_lft = prefered_lft;
1976 ifp->tstamp = jiffies;
1977 spin_unlock_bh(&ifp->lock);
1978
1979 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1980 jiffies_to_clock_t(valid_lft * HZ), flags);
1981 /*
1982 * Note that section 3.1 of RFC 4429 indicates
1983 * that the Optimistic flag should not be set for
1984 * manually configured addresses
1985 */
1986 addrconf_dad_start(ifp, 0);
1987 in6_ifa_put(ifp);
1988 addrconf_verify(0);
1989 return 0;
1990 }
1991
1992 return PTR_ERR(ifp);
1993 }
1994
1995 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
1996 int plen)
1997 {
1998 struct inet6_ifaddr *ifp;
1999 struct inet6_dev *idev;
2000 struct net_device *dev;
2001
2002 dev = __dev_get_by_index(net, ifindex);
2003 if (!dev)
2004 return -ENODEV;
2005
2006 if ((idev = __in6_dev_get(dev)) == NULL)
2007 return -ENXIO;
2008
2009 read_lock_bh(&idev->lock);
2010 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2011 if (ifp->prefix_len == plen &&
2012 ipv6_addr_equal(pfx, &ifp->addr)) {
2013 in6_ifa_hold(ifp);
2014 read_unlock_bh(&idev->lock);
2015
2016 ipv6_del_addr(ifp);
2017
2018 /* If the last address is deleted administratively,
2019 disable IPv6 on this interface.
2020 */
2021 if (idev->addr_list == NULL)
2022 addrconf_ifdown(idev->dev, 1);
2023 return 0;
2024 }
2025 }
2026 read_unlock_bh(&idev->lock);
2027 return -EADDRNOTAVAIL;
2028 }
2029
2030
2031 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2032 {
2033 struct in6_ifreq ireq;
2034 int err;
2035
2036 if (!capable(CAP_NET_ADMIN))
2037 return -EPERM;
2038
2039 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2040 return -EFAULT;
2041
2042 rtnl_lock();
2043 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2044 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2045 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2046 rtnl_unlock();
2047 return err;
2048 }
2049
2050 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2051 {
2052 struct in6_ifreq ireq;
2053 int err;
2054
2055 if (!capable(CAP_NET_ADMIN))
2056 return -EPERM;
2057
2058 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2059 return -EFAULT;
2060
2061 rtnl_lock();
2062 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2063 ireq.ifr6_prefixlen);
2064 rtnl_unlock();
2065 return err;
2066 }
2067
2068 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2069 static void sit_add_v4_addrs(struct inet6_dev *idev)
2070 {
2071 struct inet6_ifaddr * ifp;
2072 struct in6_addr addr;
2073 struct net_device *dev;
2074 struct net *net = dev_net(idev->dev);
2075 int scope;
2076
2077 ASSERT_RTNL();
2078
2079 memset(&addr, 0, sizeof(struct in6_addr));
2080 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2081
2082 if (idev->dev->flags&IFF_POINTOPOINT) {
2083 addr.s6_addr32[0] = htonl(0xfe800000);
2084 scope = IFA_LINK;
2085 } else {
2086 scope = IPV6_ADDR_COMPATv4;
2087 }
2088
2089 if (addr.s6_addr32[3]) {
2090 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2091 if (!IS_ERR(ifp)) {
2092 spin_lock_bh(&ifp->lock);
2093 ifp->flags &= ~IFA_F_TENTATIVE;
2094 spin_unlock_bh(&ifp->lock);
2095 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2096 in6_ifa_put(ifp);
2097 }
2098 return;
2099 }
2100
2101 for_each_netdev(net, dev) {
2102 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2103 if (in_dev && (dev->flags & IFF_UP)) {
2104 struct in_ifaddr * ifa;
2105
2106 int flag = scope;
2107
2108 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2109 int plen;
2110
2111 addr.s6_addr32[3] = ifa->ifa_local;
2112
2113 if (ifa->ifa_scope == RT_SCOPE_LINK)
2114 continue;
2115 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2116 if (idev->dev->flags&IFF_POINTOPOINT)
2117 continue;
2118 flag |= IFA_HOST;
2119 }
2120 if (idev->dev->flags&IFF_POINTOPOINT)
2121 plen = 64;
2122 else
2123 plen = 96;
2124
2125 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2126 IFA_F_PERMANENT);
2127 if (!IS_ERR(ifp)) {
2128 spin_lock_bh(&ifp->lock);
2129 ifp->flags &= ~IFA_F_TENTATIVE;
2130 spin_unlock_bh(&ifp->lock);
2131 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2132 in6_ifa_put(ifp);
2133 }
2134 }
2135 }
2136 }
2137 }
2138 #endif
2139
2140 static void init_loopback(struct net_device *dev)
2141 {
2142 struct inet6_dev *idev;
2143 struct inet6_ifaddr * ifp;
2144
2145 /* ::1 */
2146
2147 ASSERT_RTNL();
2148
2149 if ((idev = ipv6_find_idev(dev)) == NULL) {
2150 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2151 return;
2152 }
2153
2154 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2155 if (!IS_ERR(ifp)) {
2156 spin_lock_bh(&ifp->lock);
2157 ifp->flags &= ~IFA_F_TENTATIVE;
2158 spin_unlock_bh(&ifp->lock);
2159 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2160 in6_ifa_put(ifp);
2161 }
2162 }
2163
2164 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2165 {
2166 struct inet6_ifaddr * ifp;
2167 u32 addr_flags = IFA_F_PERMANENT;
2168
2169 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2170 if (idev->cnf.optimistic_dad &&
2171 !ipv6_devconf.forwarding)
2172 addr_flags |= IFA_F_OPTIMISTIC;
2173 #endif
2174
2175
2176 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2177 if (!IS_ERR(ifp)) {
2178 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2179 addrconf_dad_start(ifp, 0);
2180 in6_ifa_put(ifp);
2181 }
2182 }
2183
2184 static void addrconf_dev_config(struct net_device *dev)
2185 {
2186 struct in6_addr addr;
2187 struct inet6_dev * idev;
2188
2189 ASSERT_RTNL();
2190
2191 if ((dev->type != ARPHRD_ETHER) &&
2192 (dev->type != ARPHRD_FDDI) &&
2193 (dev->type != ARPHRD_IEEE802_TR) &&
2194 (dev->type != ARPHRD_ARCNET) &&
2195 (dev->type != ARPHRD_INFINIBAND)) {
2196 /* Alas, we support only Ethernet autoconfiguration. */
2197 return;
2198 }
2199
2200 idev = addrconf_add_dev(dev);
2201 if (idev == NULL)
2202 return;
2203
2204 memset(&addr, 0, sizeof(struct in6_addr));
2205 addr.s6_addr32[0] = htonl(0xFE800000);
2206
2207 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2208 addrconf_add_linklocal(idev, &addr);
2209 }
2210
2211 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2212 static void addrconf_sit_config(struct net_device *dev)
2213 {
2214 struct inet6_dev *idev;
2215
2216 ASSERT_RTNL();
2217
2218 /*
2219 * Configure the tunnel with one of our IPv4
2220 * addresses... we should configure all of
2221 * our v4 addrs in the tunnel
2222 */
2223
2224 if ((idev = ipv6_find_idev(dev)) == NULL) {
2225 printk(KERN_DEBUG "init sit: add_dev failed\n");
2226 return;
2227 }
2228
2229 if (dev->priv_flags & IFF_ISATAP) {
2230 struct in6_addr addr;
2231
2232 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2233 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2234 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2235 addrconf_add_linklocal(idev, &addr);
2236 return;
2237 }
2238
2239 sit_add_v4_addrs(idev);
2240
2241 if (dev->flags&IFF_POINTOPOINT) {
2242 addrconf_add_mroute(dev);
2243 addrconf_add_lroute(dev);
2244 } else
2245 sit_route_add(dev);
2246 }
2247 #endif
2248
2249 static inline int
2250 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2251 {
2252 struct in6_addr lladdr;
2253
2254 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2255 addrconf_add_linklocal(idev, &lladdr);
2256 return 0;
2257 }
2258 return -1;
2259 }
2260
2261 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2262 {
2263 struct net_device *link_dev;
2264 struct net *net = dev_net(idev->dev);
2265
2266 /* first try to inherit the link-local address from the link device */
2267 if (idev->dev->iflink &&
2268 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2269 if (!ipv6_inherit_linklocal(idev, link_dev))
2270 return;
2271 }
2272 /* then try to inherit it from any device */
2273 for_each_netdev(net, link_dev) {
2274 if (!ipv6_inherit_linklocal(idev, link_dev))
2275 return;
2276 }
2277 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2278 }
2279
2280 /*
2281 * Autoconfigure tunnel with a link-local address so routing protocols,
2282 * DHCPv6, MLD etc. can be run over the virtual link
2283 */
2284
2285 static void addrconf_ip6_tnl_config(struct net_device *dev)
2286 {
2287 struct inet6_dev *idev;
2288
2289 ASSERT_RTNL();
2290
2291 if ((idev = addrconf_add_dev(dev)) == NULL) {
2292 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2293 return;
2294 }
2295 ip6_tnl_add_linklocal(idev);
2296 }
2297
2298 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2299 void * data)
2300 {
2301 struct net_device *dev = (struct net_device *) data;
2302 struct inet6_dev *idev = __in6_dev_get(dev);
2303 int run_pending = 0;
2304 int err;
2305
2306 switch(event) {
2307 case NETDEV_REGISTER:
2308 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2309 idev = ipv6_add_dev(dev);
2310 if (!idev)
2311 return notifier_from_errno(-ENOMEM);
2312 }
2313 break;
2314 case NETDEV_UP:
2315 case NETDEV_CHANGE:
2316 if (dev->flags & IFF_SLAVE)
2317 break;
2318
2319 if (event == NETDEV_UP) {
2320 if (!addrconf_qdisc_ok(dev)) {
2321 /* device is not ready yet. */
2322 printk(KERN_INFO
2323 "ADDRCONF(NETDEV_UP): %s: "
2324 "link is not ready\n",
2325 dev->name);
2326 break;
2327 }
2328
2329 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2330 idev = ipv6_add_dev(dev);
2331
2332 if (idev)
2333 idev->if_flags |= IF_READY;
2334 } else {
2335 if (!addrconf_qdisc_ok(dev)) {
2336 /* device is still not ready. */
2337 break;
2338 }
2339
2340 if (idev) {
2341 if (idev->if_flags & IF_READY) {
2342 /* device is already configured. */
2343 break;
2344 }
2345 idev->if_flags |= IF_READY;
2346 }
2347
2348 printk(KERN_INFO
2349 "ADDRCONF(NETDEV_CHANGE): %s: "
2350 "link becomes ready\n",
2351 dev->name);
2352
2353 run_pending = 1;
2354 }
2355
2356 switch(dev->type) {
2357 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2358 case ARPHRD_SIT:
2359 addrconf_sit_config(dev);
2360 break;
2361 #endif
2362 case ARPHRD_TUNNEL6:
2363 addrconf_ip6_tnl_config(dev);
2364 break;
2365 case ARPHRD_LOOPBACK:
2366 init_loopback(dev);
2367 break;
2368
2369 default:
2370 addrconf_dev_config(dev);
2371 break;
2372 }
2373 if (idev) {
2374 if (run_pending)
2375 addrconf_dad_run(idev);
2376
2377 /* If the MTU changed during the interface down, when the
2378 interface up, the changed MTU must be reflected in the
2379 idev as well as routers.
2380 */
2381 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2382 rt6_mtu_change(dev, dev->mtu);
2383 idev->cnf.mtu6 = dev->mtu;
2384 }
2385 idev->tstamp = jiffies;
2386 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2387 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2388 stop IPv6 on this interface.
2389 */
2390 if (dev->mtu < IPV6_MIN_MTU)
2391 addrconf_ifdown(dev, event != NETDEV_DOWN);
2392 }
2393 break;
2394
2395 case NETDEV_CHANGEMTU:
2396 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2397 rt6_mtu_change(dev, dev->mtu);
2398 idev->cnf.mtu6 = dev->mtu;
2399 break;
2400 }
2401
2402 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2403 idev = ipv6_add_dev(dev);
2404 if (idev)
2405 break;
2406 }
2407
2408 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2409
2410 case NETDEV_DOWN:
2411 case NETDEV_UNREGISTER:
2412 /*
2413 * Remove all addresses from this interface.
2414 */
2415 addrconf_ifdown(dev, event != NETDEV_DOWN);
2416 break;
2417
2418 case NETDEV_CHANGENAME:
2419 if (idev) {
2420 snmp6_unregister_dev(idev);
2421 addrconf_sysctl_unregister(idev);
2422 addrconf_sysctl_register(idev);
2423 err = snmp6_register_dev(idev);
2424 if (err)
2425 return notifier_from_errno(err);
2426 }
2427 break;
2428 }
2429
2430 return NOTIFY_OK;
2431 }
2432
2433 /*
2434 * addrconf module should be notified of a device going up
2435 */
2436 static struct notifier_block ipv6_dev_notf = {
2437 .notifier_call = addrconf_notify,
2438 .priority = 0
2439 };
2440
2441 static int addrconf_ifdown(struct net_device *dev, int how)
2442 {
2443 struct inet6_dev *idev;
2444 struct inet6_ifaddr *ifa, **bifa;
2445 struct net *net = dev_net(dev);
2446 int i;
2447
2448 ASSERT_RTNL();
2449
2450 if (dev == init_net.loopback_dev && how == 1)
2451 how = 0;
2452
2453 rt6_ifdown(net, dev);
2454 neigh_ifdown(&nd_tbl, dev);
2455
2456 idev = __in6_dev_get(dev);
2457 if (idev == NULL)
2458 return -ENODEV;
2459
2460 /* Step 1: remove reference to ipv6 device from parent device.
2461 Do not dev_put!
2462 */
2463 if (how == 1) {
2464 idev->dead = 1;
2465
2466 /* protected by rtnl_lock */
2467 rcu_assign_pointer(dev->ip6_ptr, NULL);
2468
2469 /* Step 1.5: remove snmp6 entry */
2470 snmp6_unregister_dev(idev);
2471
2472 }
2473
2474 /* Step 2: clear hash table */
2475 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2476 bifa = &inet6_addr_lst[i];
2477
2478 write_lock_bh(&addrconf_hash_lock);
2479 while ((ifa = *bifa) != NULL) {
2480 if (ifa->idev == idev) {
2481 *bifa = ifa->lst_next;
2482 ifa->lst_next = NULL;
2483 addrconf_del_timer(ifa);
2484 in6_ifa_put(ifa);
2485 continue;
2486 }
2487 bifa = &ifa->lst_next;
2488 }
2489 write_unlock_bh(&addrconf_hash_lock);
2490 }
2491
2492 write_lock_bh(&idev->lock);
2493
2494 /* Step 3: clear flags for stateless addrconf */
2495 if (how != 1)
2496 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2497
2498 /* Step 4: clear address list */
2499 #ifdef CONFIG_IPV6_PRIVACY
2500 if (how == 1 && del_timer(&idev->regen_timer))
2501 in6_dev_put(idev);
2502
2503 /* clear tempaddr list */
2504 while ((ifa = idev->tempaddr_list) != NULL) {
2505 idev->tempaddr_list = ifa->tmp_next;
2506 ifa->tmp_next = NULL;
2507 ifa->dead = 1;
2508 write_unlock_bh(&idev->lock);
2509 spin_lock_bh(&ifa->lock);
2510
2511 if (ifa->ifpub) {
2512 in6_ifa_put(ifa->ifpub);
2513 ifa->ifpub = NULL;
2514 }
2515 spin_unlock_bh(&ifa->lock);
2516 in6_ifa_put(ifa);
2517 write_lock_bh(&idev->lock);
2518 }
2519 #endif
2520 while ((ifa = idev->addr_list) != NULL) {
2521 idev->addr_list = ifa->if_next;
2522 ifa->if_next = NULL;
2523 ifa->dead = 1;
2524 addrconf_del_timer(ifa);
2525 write_unlock_bh(&idev->lock);
2526
2527 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2528 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2529 in6_ifa_put(ifa);
2530
2531 write_lock_bh(&idev->lock);
2532 }
2533 write_unlock_bh(&idev->lock);
2534
2535 /* Step 5: Discard multicast list */
2536
2537 if (how == 1)
2538 ipv6_mc_destroy_dev(idev);
2539 else
2540 ipv6_mc_down(idev);
2541
2542 idev->tstamp = jiffies;
2543
2544 /* Shot the device (if unregistered) */
2545
2546 if (how == 1) {
2547 addrconf_sysctl_unregister(idev);
2548 neigh_parms_release(&nd_tbl, idev->nd_parms);
2549 neigh_ifdown(&nd_tbl, dev);
2550 in6_dev_put(idev);
2551 }
2552 return 0;
2553 }
2554
2555 static void addrconf_rs_timer(unsigned long data)
2556 {
2557 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2558
2559 if (ifp->idev->cnf.forwarding)
2560 goto out;
2561
2562 if (ifp->idev->if_flags & IF_RA_RCVD) {
2563 /*
2564 * Announcement received after solicitation
2565 * was sent
2566 */
2567 goto out;
2568 }
2569
2570 spin_lock(&ifp->lock);
2571 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2572 struct in6_addr all_routers;
2573
2574 /* The wait after the last probe can be shorter */
2575 addrconf_mod_timer(ifp, AC_RS,
2576 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2577 ifp->idev->cnf.rtr_solicit_delay :
2578 ifp->idev->cnf.rtr_solicit_interval);
2579 spin_unlock(&ifp->lock);
2580
2581 ipv6_addr_all_routers(&all_routers);
2582
2583 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2584 } else {
2585 spin_unlock(&ifp->lock);
2586 /*
2587 * Note: we do not support deprecated "all on-link"
2588 * assumption any longer.
2589 */
2590 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2591 ifp->idev->dev->name);
2592 }
2593
2594 out:
2595 in6_ifa_put(ifp);
2596 }
2597
2598 /*
2599 * Duplicate Address Detection
2600 */
2601 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2602 {
2603 unsigned long rand_num;
2604 struct inet6_dev *idev = ifp->idev;
2605
2606 if (ifp->flags & IFA_F_OPTIMISTIC)
2607 rand_num = 0;
2608 else
2609 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2610
2611 ifp->probes = idev->cnf.dad_transmits;
2612 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2613 }
2614
2615 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2616 {
2617 struct inet6_dev *idev = ifp->idev;
2618 struct net_device *dev = idev->dev;
2619
2620 addrconf_join_solict(dev, &ifp->addr);
2621
2622 net_srandom(ifp->addr.s6_addr32[3]);
2623
2624 read_lock_bh(&idev->lock);
2625 if (ifp->dead)
2626 goto out;
2627 spin_lock_bh(&ifp->lock);
2628
2629 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2630 !(ifp->flags&IFA_F_TENTATIVE) ||
2631 ifp->flags & IFA_F_NODAD) {
2632 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2633 spin_unlock_bh(&ifp->lock);
2634 read_unlock_bh(&idev->lock);
2635
2636 addrconf_dad_completed(ifp);
2637 return;
2638 }
2639
2640 if (!(idev->if_flags & IF_READY)) {
2641 spin_unlock_bh(&ifp->lock);
2642 read_unlock_bh(&idev->lock);
2643 /*
2644 * If the defice is not ready:
2645 * - keep it tentative if it is a permanent address.
2646 * - otherwise, kill it.
2647 */
2648 in6_ifa_hold(ifp);
2649 addrconf_dad_stop(ifp);
2650 return;
2651 }
2652
2653 /*
2654 * Optimistic nodes can start receiving
2655 * Frames right away
2656 */
2657 if(ifp->flags & IFA_F_OPTIMISTIC)
2658 ip6_ins_rt(ifp->rt);
2659
2660 addrconf_dad_kick(ifp);
2661 spin_unlock_bh(&ifp->lock);
2662 out:
2663 read_unlock_bh(&idev->lock);
2664 }
2665
2666 static void addrconf_dad_timer(unsigned long data)
2667 {
2668 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2669 struct inet6_dev *idev = ifp->idev;
2670 struct in6_addr unspec;
2671 struct in6_addr mcaddr;
2672
2673 read_lock_bh(&idev->lock);
2674 if (idev->dead) {
2675 read_unlock_bh(&idev->lock);
2676 goto out;
2677 }
2678 spin_lock_bh(&ifp->lock);
2679 if (ifp->probes == 0) {
2680 /*
2681 * DAD was successful
2682 */
2683
2684 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2685 spin_unlock_bh(&ifp->lock);
2686 read_unlock_bh(&idev->lock);
2687
2688 addrconf_dad_completed(ifp);
2689
2690 goto out;
2691 }
2692
2693 ifp->probes--;
2694 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2695 spin_unlock_bh(&ifp->lock);
2696 read_unlock_bh(&idev->lock);
2697
2698 /* send a neighbour solicitation for our addr */
2699 memset(&unspec, 0, sizeof(unspec));
2700 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2701 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2702 out:
2703 in6_ifa_put(ifp);
2704 }
2705
2706 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2707 {
2708 struct net_device * dev = ifp->idev->dev;
2709
2710 /*
2711 * Configure the address for reception. Now it is valid.
2712 */
2713
2714 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2715
2716 /* If added prefix is link local and forwarding is off,
2717 start sending router solicitations.
2718 */
2719
2720 if (ifp->idev->cnf.forwarding == 0 &&
2721 ifp->idev->cnf.rtr_solicits > 0 &&
2722 (dev->flags&IFF_LOOPBACK) == 0 &&
2723 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2724 struct in6_addr all_routers;
2725
2726 ipv6_addr_all_routers(&all_routers);
2727
2728 /*
2729 * If a host as already performed a random delay
2730 * [...] as part of DAD [...] there is no need
2731 * to delay again before sending the first RS
2732 */
2733 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2734
2735 spin_lock_bh(&ifp->lock);
2736 ifp->probes = 1;
2737 ifp->idev->if_flags |= IF_RS_SENT;
2738 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2739 spin_unlock_bh(&ifp->lock);
2740 }
2741 }
2742
2743 static void addrconf_dad_run(struct inet6_dev *idev) {
2744 struct inet6_ifaddr *ifp;
2745
2746 read_lock_bh(&idev->lock);
2747 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2748 spin_lock_bh(&ifp->lock);
2749 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2750 spin_unlock_bh(&ifp->lock);
2751 continue;
2752 }
2753 spin_unlock_bh(&ifp->lock);
2754 addrconf_dad_kick(ifp);
2755 }
2756 read_unlock_bh(&idev->lock);
2757 }
2758
2759 #ifdef CONFIG_PROC_FS
2760 struct if6_iter_state {
2761 struct seq_net_private p;
2762 int bucket;
2763 };
2764
2765 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2766 {
2767 struct inet6_ifaddr *ifa = NULL;
2768 struct if6_iter_state *state = seq->private;
2769 struct net *net = seq_file_net(seq);
2770
2771 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2772 ifa = inet6_addr_lst[state->bucket];
2773
2774 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2775 ifa = ifa->lst_next;
2776 if (ifa)
2777 break;
2778 }
2779 return ifa;
2780 }
2781
2782 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2783 {
2784 struct if6_iter_state *state = seq->private;
2785 struct net *net = seq_file_net(seq);
2786
2787 ifa = ifa->lst_next;
2788 try_again:
2789 if (ifa) {
2790 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2791 ifa = ifa->lst_next;
2792 goto try_again;
2793 }
2794 }
2795
2796 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2797 ifa = inet6_addr_lst[state->bucket];
2798 goto try_again;
2799 }
2800
2801 return ifa;
2802 }
2803
2804 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2805 {
2806 struct inet6_ifaddr *ifa = if6_get_first(seq);
2807
2808 if (ifa)
2809 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2810 --pos;
2811 return pos ? NULL : ifa;
2812 }
2813
2814 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2815 __acquires(addrconf_hash_lock)
2816 {
2817 read_lock_bh(&addrconf_hash_lock);
2818 return if6_get_idx(seq, *pos);
2819 }
2820
2821 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2822 {
2823 struct inet6_ifaddr *ifa;
2824
2825 ifa = if6_get_next(seq, v);
2826 ++*pos;
2827 return ifa;
2828 }
2829
2830 static void if6_seq_stop(struct seq_file *seq, void *v)
2831 __releases(addrconf_hash_lock)
2832 {
2833 read_unlock_bh(&addrconf_hash_lock);
2834 }
2835
2836 static int if6_seq_show(struct seq_file *seq, void *v)
2837 {
2838 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2839 seq_printf(seq,
2840 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2841 NIP6(ifp->addr),
2842 ifp->idev->dev->ifindex,
2843 ifp->prefix_len,
2844 ifp->scope,
2845 ifp->flags,
2846 ifp->idev->dev->name);
2847 return 0;
2848 }
2849
2850 static const struct seq_operations if6_seq_ops = {
2851 .start = if6_seq_start,
2852 .next = if6_seq_next,
2853 .show = if6_seq_show,
2854 .stop = if6_seq_stop,
2855 };
2856
2857 static int if6_seq_open(struct inode *inode, struct file *file)
2858 {
2859 return seq_open_net(inode, file, &if6_seq_ops,
2860 sizeof(struct if6_iter_state));
2861 }
2862
2863 static const struct file_operations if6_fops = {
2864 .owner = THIS_MODULE,
2865 .open = if6_seq_open,
2866 .read = seq_read,
2867 .llseek = seq_lseek,
2868 .release = seq_release_net,
2869 };
2870
2871 static int if6_proc_net_init(struct net *net)
2872 {
2873 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2874 return -ENOMEM;
2875 return 0;
2876 }
2877
2878 static void if6_proc_net_exit(struct net *net)
2879 {
2880 proc_net_remove(net, "if_inet6");
2881 }
2882
2883 static struct pernet_operations if6_proc_net_ops = {
2884 .init = if6_proc_net_init,
2885 .exit = if6_proc_net_exit,
2886 };
2887
2888 int __init if6_proc_init(void)
2889 {
2890 return register_pernet_subsys(&if6_proc_net_ops);
2891 }
2892
2893 void if6_proc_exit(void)
2894 {
2895 unregister_pernet_subsys(&if6_proc_net_ops);
2896 }
2897 #endif /* CONFIG_PROC_FS */
2898
2899 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2900 /* Check if address is a home address configured on any interface. */
2901 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2902 {
2903 int ret = 0;
2904 struct inet6_ifaddr * ifp;
2905 u8 hash = ipv6_addr_hash(addr);
2906 read_lock_bh(&addrconf_hash_lock);
2907 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2908 if (!net_eq(dev_net(ifp->idev->dev), net))
2909 continue;
2910 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2911 (ifp->flags & IFA_F_HOMEADDRESS)) {
2912 ret = 1;
2913 break;
2914 }
2915 }
2916 read_unlock_bh(&addrconf_hash_lock);
2917 return ret;
2918 }
2919 #endif
2920
2921 /*
2922 * Periodic address status verification
2923 */
2924
2925 static void addrconf_verify(unsigned long foo)
2926 {
2927 struct inet6_ifaddr *ifp;
2928 unsigned long now, next;
2929 int i;
2930
2931 spin_lock_bh(&addrconf_verify_lock);
2932 now = jiffies;
2933 next = now + ADDR_CHECK_FREQUENCY;
2934
2935 del_timer(&addr_chk_timer);
2936
2937 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2938
2939 restart:
2940 read_lock(&addrconf_hash_lock);
2941 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2942 unsigned long age;
2943 #ifdef CONFIG_IPV6_PRIVACY
2944 unsigned long regen_advance;
2945 #endif
2946
2947 if (ifp->flags & IFA_F_PERMANENT)
2948 continue;
2949
2950 spin_lock(&ifp->lock);
2951 age = (now - ifp->tstamp) / HZ;
2952
2953 #ifdef CONFIG_IPV6_PRIVACY
2954 regen_advance = ifp->idev->cnf.regen_max_retry *
2955 ifp->idev->cnf.dad_transmits *
2956 ifp->idev->nd_parms->retrans_time / HZ;
2957 #endif
2958
2959 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2960 age >= ifp->valid_lft) {
2961 spin_unlock(&ifp->lock);
2962 in6_ifa_hold(ifp);
2963 read_unlock(&addrconf_hash_lock);
2964 ipv6_del_addr(ifp);
2965 goto restart;
2966 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2967 spin_unlock(&ifp->lock);
2968 continue;
2969 } else if (age >= ifp->prefered_lft) {
2970 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2971 int deprecate = 0;
2972
2973 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2974 deprecate = 1;
2975 ifp->flags |= IFA_F_DEPRECATED;
2976 }
2977
2978 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2979 next = ifp->tstamp + ifp->valid_lft * HZ;
2980
2981 spin_unlock(&ifp->lock);
2982
2983 if (deprecate) {
2984 in6_ifa_hold(ifp);
2985 read_unlock(&addrconf_hash_lock);
2986
2987 ipv6_ifa_notify(0, ifp);
2988 in6_ifa_put(ifp);
2989 goto restart;
2990 }
2991 #ifdef CONFIG_IPV6_PRIVACY
2992 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2993 !(ifp->flags&IFA_F_TENTATIVE)) {
2994 if (age >= ifp->prefered_lft - regen_advance) {
2995 struct inet6_ifaddr *ifpub = ifp->ifpub;
2996 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2997 next = ifp->tstamp + ifp->prefered_lft * HZ;
2998 if (!ifp->regen_count && ifpub) {
2999 ifp->regen_count++;
3000 in6_ifa_hold(ifp);
3001 in6_ifa_hold(ifpub);
3002 spin_unlock(&ifp->lock);
3003 read_unlock(&addrconf_hash_lock);
3004 spin_lock(&ifpub->lock);
3005 ifpub->regen_count = 0;
3006 spin_unlock(&ifpub->lock);
3007 ipv6_create_tempaddr(ifpub, ifp);
3008 in6_ifa_put(ifpub);
3009 in6_ifa_put(ifp);
3010 goto restart;
3011 }
3012 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3013 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3014 spin_unlock(&ifp->lock);
3015 #endif
3016 } else {
3017 /* ifp->prefered_lft <= ifp->valid_lft */
3018 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3019 next = ifp->tstamp + ifp->prefered_lft * HZ;
3020 spin_unlock(&ifp->lock);
3021 }
3022 }
3023 read_unlock(&addrconf_hash_lock);
3024 }
3025
3026 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3027 add_timer(&addr_chk_timer);
3028 spin_unlock_bh(&addrconf_verify_lock);
3029 }
3030
3031 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3032 {
3033 struct in6_addr *pfx = NULL;
3034
3035 if (addr)
3036 pfx = nla_data(addr);
3037
3038 if (local) {
3039 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3040 pfx = NULL;
3041 else
3042 pfx = nla_data(local);
3043 }
3044
3045 return pfx;
3046 }
3047
3048 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3049 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3050 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3051 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3052 };
3053
3054 static int
3055 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3056 {
3057 struct net *net = sock_net(skb->sk);
3058 struct ifaddrmsg *ifm;
3059 struct nlattr *tb[IFA_MAX+1];
3060 struct in6_addr *pfx;
3061 int err;
3062
3063 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3064 if (err < 0)
3065 return err;
3066
3067 ifm = nlmsg_data(nlh);
3068 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3069 if (pfx == NULL)
3070 return -EINVAL;
3071
3072 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3073 }
3074
3075 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3076 u32 prefered_lft, u32 valid_lft)
3077 {
3078 u32 flags = RTF_EXPIRES;
3079
3080 if (!valid_lft || (prefered_lft > valid_lft))
3081 return -EINVAL;
3082
3083 if (valid_lft == INFINITY_LIFE_TIME) {
3084 ifa_flags |= IFA_F_PERMANENT;
3085 flags = 0;
3086 } else if (valid_lft >= 0x7FFFFFFF/HZ)
3087 valid_lft = 0x7FFFFFFF/HZ;
3088
3089 if (prefered_lft == 0)
3090 ifa_flags |= IFA_F_DEPRECATED;
3091 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3092 (prefered_lft != INFINITY_LIFE_TIME))
3093 prefered_lft = 0x7FFFFFFF/HZ;
3094
3095 spin_lock_bh(&ifp->lock);
3096 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3097 ifp->tstamp = jiffies;
3098 ifp->valid_lft = valid_lft;
3099 ifp->prefered_lft = prefered_lft;
3100
3101 spin_unlock_bh(&ifp->lock);
3102 if (!(ifp->flags&IFA_F_TENTATIVE))
3103 ipv6_ifa_notify(0, ifp);
3104
3105 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3106 jiffies_to_clock_t(valid_lft * HZ), flags);
3107 addrconf_verify(0);
3108
3109 return 0;
3110 }
3111
3112 static int
3113 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3114 {
3115 struct net *net = sock_net(skb->sk);
3116 struct ifaddrmsg *ifm;
3117 struct nlattr *tb[IFA_MAX+1];
3118 struct in6_addr *pfx;
3119 struct inet6_ifaddr *ifa;
3120 struct net_device *dev;
3121 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3122 u8 ifa_flags;
3123 int err;
3124
3125 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3126 if (err < 0)
3127 return err;
3128
3129 ifm = nlmsg_data(nlh);
3130 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3131 if (pfx == NULL)
3132 return -EINVAL;
3133
3134 if (tb[IFA_CACHEINFO]) {
3135 struct ifa_cacheinfo *ci;
3136
3137 ci = nla_data(tb[IFA_CACHEINFO]);
3138 valid_lft = ci->ifa_valid;
3139 preferred_lft = ci->ifa_prefered;
3140 } else {
3141 preferred_lft = INFINITY_LIFE_TIME;
3142 valid_lft = INFINITY_LIFE_TIME;
3143 }
3144
3145 dev = __dev_get_by_index(net, ifm->ifa_index);
3146 if (dev == NULL)
3147 return -ENODEV;
3148
3149 /* We ignore other flags so far. */
3150 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3151
3152 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3153 if (ifa == NULL) {
3154 /*
3155 * It would be best to check for !NLM_F_CREATE here but
3156 * userspace alreay relies on not having to provide this.
3157 */
3158 return inet6_addr_add(net, ifm->ifa_index, pfx,
3159 ifm->ifa_prefixlen, ifa_flags,
3160 preferred_lft, valid_lft);
3161 }
3162
3163 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3164 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3165 err = -EEXIST;
3166 else
3167 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3168
3169 in6_ifa_put(ifa);
3170
3171 return err;
3172 }
3173
3174 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3175 u8 scope, int ifindex)
3176 {
3177 struct ifaddrmsg *ifm;
3178
3179 ifm = nlmsg_data(nlh);
3180 ifm->ifa_family = AF_INET6;
3181 ifm->ifa_prefixlen = prefixlen;
3182 ifm->ifa_flags = flags;
3183 ifm->ifa_scope = scope;
3184 ifm->ifa_index = ifindex;
3185 }
3186
3187 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3188 unsigned long tstamp, u32 preferred, u32 valid)
3189 {
3190 struct ifa_cacheinfo ci;
3191
3192 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3193 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3194 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3195 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3196 ci.ifa_prefered = preferred;
3197 ci.ifa_valid = valid;
3198
3199 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3200 }
3201
3202 static inline int rt_scope(int ifa_scope)
3203 {
3204 if (ifa_scope & IFA_HOST)
3205 return RT_SCOPE_HOST;
3206 else if (ifa_scope & IFA_LINK)
3207 return RT_SCOPE_LINK;
3208 else if (ifa_scope & IFA_SITE)
3209 return RT_SCOPE_SITE;
3210 else
3211 return RT_SCOPE_UNIVERSE;
3212 }
3213
3214 static inline int inet6_ifaddr_msgsize(void)
3215 {
3216 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3217 + nla_total_size(16) /* IFA_ADDRESS */
3218 + nla_total_size(sizeof(struct ifa_cacheinfo));
3219 }
3220
3221 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3222 u32 pid, u32 seq, int event, unsigned int flags)
3223 {
3224 struct nlmsghdr *nlh;
3225 u32 preferred, valid;
3226
3227 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3228 if (nlh == NULL)
3229 return -EMSGSIZE;
3230
3231 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3232 ifa->idev->dev->ifindex);
3233
3234 if (!(ifa->flags&IFA_F_PERMANENT)) {
3235 preferred = ifa->prefered_lft;
3236 valid = ifa->valid_lft;
3237 if (preferred != INFINITY_LIFE_TIME) {
3238 long tval = (jiffies - ifa->tstamp)/HZ;
3239 preferred -= tval;
3240 if (valid != INFINITY_LIFE_TIME)
3241 valid -= tval;
3242 }
3243 } else {
3244 preferred = INFINITY_LIFE_TIME;
3245 valid = INFINITY_LIFE_TIME;
3246 }
3247
3248 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3249 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3250 nlmsg_cancel(skb, nlh);
3251 return -EMSGSIZE;
3252 }
3253
3254 return nlmsg_end(skb, nlh);
3255 }
3256
3257 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3258 u32 pid, u32 seq, int event, u16 flags)
3259 {
3260 struct nlmsghdr *nlh;
3261 u8 scope = RT_SCOPE_UNIVERSE;
3262 int ifindex = ifmca->idev->dev->ifindex;
3263
3264 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3265 scope = RT_SCOPE_SITE;
3266
3267 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3268 if (nlh == NULL)
3269 return -EMSGSIZE;
3270
3271 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3272 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3273 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3274 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3275 nlmsg_cancel(skb, nlh);
3276 return -EMSGSIZE;
3277 }
3278
3279 return nlmsg_end(skb, nlh);
3280 }
3281
3282 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3283 u32 pid, u32 seq, int event, unsigned int flags)
3284 {
3285 struct nlmsghdr *nlh;
3286 u8 scope = RT_SCOPE_UNIVERSE;
3287 int ifindex = ifaca->aca_idev->dev->ifindex;
3288
3289 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3290 scope = RT_SCOPE_SITE;
3291
3292 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3293 if (nlh == NULL)
3294 return -EMSGSIZE;
3295
3296 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3297 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3298 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3299 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3300 nlmsg_cancel(skb, nlh);
3301 return -EMSGSIZE;
3302 }
3303
3304 return nlmsg_end(skb, nlh);
3305 }
3306
3307 enum addr_type_t
3308 {
3309 UNICAST_ADDR,
3310 MULTICAST_ADDR,
3311 ANYCAST_ADDR,
3312 };
3313
3314 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3315 enum addr_type_t type)
3316 {
3317 int idx, ip_idx;
3318 int s_idx, s_ip_idx;
3319 int err = 1;
3320 struct net_device *dev;
3321 struct inet6_dev *idev = NULL;
3322 struct inet6_ifaddr *ifa;
3323 struct ifmcaddr6 *ifmca;
3324 struct ifacaddr6 *ifaca;
3325 struct net *net = sock_net(skb->sk);
3326
3327 s_idx = cb->args[0];
3328 s_ip_idx = ip_idx = cb->args[1];
3329
3330 idx = 0;
3331 for_each_netdev(net, dev) {
3332 if (idx < s_idx)
3333 goto cont;
3334 if (idx > s_idx)
3335 s_ip_idx = 0;
3336 ip_idx = 0;
3337 if ((idev = in6_dev_get(dev)) == NULL)
3338 goto cont;
3339 read_lock_bh(&idev->lock);
3340 switch (type) {
3341 case UNICAST_ADDR:
3342 /* unicast address incl. temp addr */
3343 for (ifa = idev->addr_list; ifa;
3344 ifa = ifa->if_next, ip_idx++) {
3345 if (ip_idx < s_ip_idx)
3346 continue;
3347 err = inet6_fill_ifaddr(skb, ifa,
3348 NETLINK_CB(cb->skb).pid,
3349 cb->nlh->nlmsg_seq,
3350 RTM_NEWADDR,
3351 NLM_F_MULTI);
3352 }
3353 break;
3354 case MULTICAST_ADDR:
3355 /* multicast address */
3356 for (ifmca = idev->mc_list; ifmca;
3357 ifmca = ifmca->next, ip_idx++) {
3358 if (ip_idx < s_ip_idx)
3359 continue;
3360 err = inet6_fill_ifmcaddr(skb, ifmca,
3361 NETLINK_CB(cb->skb).pid,
3362 cb->nlh->nlmsg_seq,
3363 RTM_GETMULTICAST,
3364 NLM_F_MULTI);
3365 }
3366 break;
3367 case ANYCAST_ADDR:
3368 /* anycast address */
3369 for (ifaca = idev->ac_list; ifaca;
3370 ifaca = ifaca->aca_next, ip_idx++) {
3371 if (ip_idx < s_ip_idx)
3372 continue;
3373 err = inet6_fill_ifacaddr(skb, ifaca,
3374 NETLINK_CB(cb->skb).pid,
3375 cb->nlh->nlmsg_seq,
3376 RTM_GETANYCAST,
3377 NLM_F_MULTI);
3378 }
3379 break;
3380 default:
3381 break;
3382 }
3383 read_unlock_bh(&idev->lock);
3384 in6_dev_put(idev);
3385
3386 if (err <= 0)
3387 break;
3388 cont:
3389 idx++;
3390 }
3391 cb->args[0] = idx;
3392 cb->args[1] = ip_idx;
3393 return skb->len;
3394 }
3395
3396 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3397 {
3398 enum addr_type_t type = UNICAST_ADDR;
3399
3400 return inet6_dump_addr(skb, cb, type);
3401 }
3402
3403 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3404 {
3405 enum addr_type_t type = MULTICAST_ADDR;
3406
3407 return inet6_dump_addr(skb, cb, type);
3408 }
3409
3410
3411 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3412 {
3413 enum addr_type_t type = ANYCAST_ADDR;
3414
3415 return inet6_dump_addr(skb, cb, type);
3416 }
3417
3418 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3419 void *arg)
3420 {
3421 struct net *net = sock_net(in_skb->sk);
3422 struct ifaddrmsg *ifm;
3423 struct nlattr *tb[IFA_MAX+1];
3424 struct in6_addr *addr = NULL;
3425 struct net_device *dev = NULL;
3426 struct inet6_ifaddr *ifa;
3427 struct sk_buff *skb;
3428 int err;
3429
3430 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3431 if (err < 0)
3432 goto errout;
3433
3434 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3435 if (addr == NULL) {
3436 err = -EINVAL;
3437 goto errout;
3438 }
3439
3440 ifm = nlmsg_data(nlh);
3441 if (ifm->ifa_index)
3442 dev = __dev_get_by_index(net, ifm->ifa_index);
3443
3444 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3445 err = -EADDRNOTAVAIL;
3446 goto errout;
3447 }
3448
3449 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3450 err = -ENOBUFS;
3451 goto errout_ifa;
3452 }
3453
3454 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3455 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3456 if (err < 0) {
3457 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3458 WARN_ON(err == -EMSGSIZE);
3459 kfree_skb(skb);
3460 goto errout_ifa;
3461 }
3462 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3463 errout_ifa:
3464 in6_ifa_put(ifa);
3465 errout:
3466 return err;
3467 }
3468
3469 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3470 {
3471 struct sk_buff *skb;
3472 struct net *net = dev_net(ifa->idev->dev);
3473 int err = -ENOBUFS;
3474
3475 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3476 if (skb == NULL)
3477 goto errout;
3478
3479 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3480 if (err < 0) {
3481 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3482 WARN_ON(err == -EMSGSIZE);
3483 kfree_skb(skb);
3484 goto errout;
3485 }
3486 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3487 errout:
3488 if (err < 0)
3489 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3490 }
3491
3492 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3493 __s32 *array, int bytes)
3494 {
3495 BUG_ON(bytes < (DEVCONF_MAX * 4));
3496
3497 memset(array, 0, bytes);
3498 array[DEVCONF_FORWARDING] = cnf->forwarding;
3499 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3500 array[DEVCONF_MTU6] = cnf->mtu6;
3501 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3502 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3503 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3504 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3505 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3506 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3507 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3508 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3509 #ifdef CONFIG_IPV6_PRIVACY
3510 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3511 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3512 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3513 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3514 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3515 #endif
3516 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3517 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3518 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3519 #ifdef CONFIG_IPV6_ROUTER_PREF
3520 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3521 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3522 #ifdef CONFIG_IPV6_ROUTE_INFO
3523 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3524 #endif
3525 #endif
3526 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3527 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3528 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3529 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3530 #endif
3531 }
3532
3533 static inline size_t inet6_if_nlmsg_size(void)
3534 {
3535 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3536 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3537 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3538 + nla_total_size(4) /* IFLA_MTU */
3539 + nla_total_size(4) /* IFLA_LINK */
3540 + nla_total_size( /* IFLA_PROTINFO */
3541 nla_total_size(4) /* IFLA_INET6_FLAGS */
3542 + nla_total_size(sizeof(struct ifla_cacheinfo))
3543 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3544 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3545 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3546 );
3547 }
3548
3549 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3550 int bytes)
3551 {
3552 int i;
3553 int pad = bytes - sizeof(u64) * items;
3554 BUG_ON(pad < 0);
3555
3556 /* Use put_unaligned() because stats may not be aligned for u64. */
3557 put_unaligned(items, &stats[0]);
3558 for (i = 1; i < items; i++)
3559 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3560
3561 memset(&stats[items], 0, pad);
3562 }
3563
3564 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3565 int bytes)
3566 {
3567 switch(attrtype) {
3568 case IFLA_INET6_STATS:
3569 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3570 break;
3571 case IFLA_INET6_ICMP6STATS:
3572 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3573 break;
3574 }
3575 }
3576
3577 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3578 u32 pid, u32 seq, int event, unsigned int flags)
3579 {
3580 struct net_device *dev = idev->dev;
3581 struct nlattr *nla;
3582 struct ifinfomsg *hdr;
3583 struct nlmsghdr *nlh;
3584 void *protoinfo;
3585 struct ifla_cacheinfo ci;
3586
3587 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3588 if (nlh == NULL)
3589 return -EMSGSIZE;
3590
3591 hdr = nlmsg_data(nlh);
3592 hdr->ifi_family = AF_INET6;
3593 hdr->__ifi_pad = 0;
3594 hdr->ifi_type = dev->type;
3595 hdr->ifi_index = dev->ifindex;
3596 hdr->ifi_flags = dev_get_flags(dev);
3597 hdr->ifi_change = 0;
3598
3599 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3600
3601 if (dev->addr_len)
3602 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3603
3604 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3605 if (dev->ifindex != dev->iflink)
3606 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3607
3608 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3609 if (protoinfo == NULL)
3610 goto nla_put_failure;
3611
3612 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3613
3614 ci.max_reasm_len = IPV6_MAXPLEN;
3615 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3616 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3617 ci.reachable_time = idev->nd_parms->reachable_time;
3618 ci.retrans_time = idev->nd_parms->retrans_time;
3619 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3620
3621 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3622 if (nla == NULL)
3623 goto nla_put_failure;
3624 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3625
3626 /* XXX - MC not implemented */
3627
3628 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3629 if (nla == NULL)
3630 goto nla_put_failure;
3631 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3632
3633 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3634 if (nla == NULL)
3635 goto nla_put_failure;
3636 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3637
3638 nla_nest_end(skb, protoinfo);
3639 return nlmsg_end(skb, nlh);
3640
3641 nla_put_failure:
3642 nlmsg_cancel(skb, nlh);
3643 return -EMSGSIZE;
3644 }
3645
3646 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3647 {
3648 struct net *net = sock_net(skb->sk);
3649 int idx, err;
3650 int s_idx = cb->args[0];
3651 struct net_device *dev;
3652 struct inet6_dev *idev;
3653
3654 read_lock(&dev_base_lock);
3655 idx = 0;
3656 for_each_netdev(net, dev) {
3657 if (idx < s_idx)
3658 goto cont;
3659 if ((idev = in6_dev_get(dev)) == NULL)
3660 goto cont;
3661 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3662 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3663 in6_dev_put(idev);
3664 if (err <= 0)
3665 break;
3666 cont:
3667 idx++;
3668 }
3669 read_unlock(&dev_base_lock);
3670 cb->args[0] = idx;
3671
3672 return skb->len;
3673 }
3674
3675 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3676 {
3677 struct sk_buff *skb;
3678 struct net *net = dev_net(idev->dev);
3679 int err = -ENOBUFS;
3680
3681 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3682 if (skb == NULL)
3683 goto errout;
3684
3685 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3686 if (err < 0) {
3687 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3688 WARN_ON(err == -EMSGSIZE);
3689 kfree_skb(skb);
3690 goto errout;
3691 }
3692 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3693 errout:
3694 if (err < 0)
3695 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3696 }
3697
3698 static inline size_t inet6_prefix_nlmsg_size(void)
3699 {
3700 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3701 + nla_total_size(sizeof(struct in6_addr))
3702 + nla_total_size(sizeof(struct prefix_cacheinfo));
3703 }
3704
3705 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3706 struct prefix_info *pinfo, u32 pid, u32 seq,
3707 int event, unsigned int flags)
3708 {
3709 struct prefixmsg *pmsg;
3710 struct nlmsghdr *nlh;
3711 struct prefix_cacheinfo ci;
3712
3713 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3714 if (nlh == NULL)
3715 return -EMSGSIZE;
3716
3717 pmsg = nlmsg_data(nlh);
3718 pmsg->prefix_family = AF_INET6;
3719 pmsg->prefix_pad1 = 0;
3720 pmsg->prefix_pad2 = 0;
3721 pmsg->prefix_ifindex = idev->dev->ifindex;
3722 pmsg->prefix_len = pinfo->prefix_len;
3723 pmsg->prefix_type = pinfo->type;
3724 pmsg->prefix_pad3 = 0;
3725 pmsg->prefix_flags = 0;
3726 if (pinfo->onlink)
3727 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3728 if (pinfo->autoconf)
3729 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3730
3731 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3732
3733 ci.preferred_time = ntohl(pinfo->prefered);
3734 ci.valid_time = ntohl(pinfo->valid);
3735 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3736
3737 return nlmsg_end(skb, nlh);
3738
3739 nla_put_failure:
3740 nlmsg_cancel(skb, nlh);
3741 return -EMSGSIZE;
3742 }
3743
3744 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3745 struct prefix_info *pinfo)
3746 {
3747 struct sk_buff *skb;
3748 struct net *net = dev_net(idev->dev);
3749 int err = -ENOBUFS;
3750
3751 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3752 if (skb == NULL)
3753 goto errout;
3754
3755 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3756 if (err < 0) {
3757 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3758 WARN_ON(err == -EMSGSIZE);
3759 kfree_skb(skb);
3760 goto errout;
3761 }
3762 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3763 errout:
3764 if (err < 0)
3765 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3766 }
3767
3768 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3769 {
3770 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3771
3772 switch (event) {
3773 case RTM_NEWADDR:
3774 /*
3775 * If the address was optimistic
3776 * we inserted the route at the start of
3777 * our DAD process, so we don't need
3778 * to do it again
3779 */
3780 if (!(ifp->rt->rt6i_node))
3781 ip6_ins_rt(ifp->rt);
3782 if (ifp->idev->cnf.forwarding)
3783 addrconf_join_anycast(ifp);
3784 break;
3785 case RTM_DELADDR:
3786 if (ifp->idev->cnf.forwarding)
3787 addrconf_leave_anycast(ifp);
3788 addrconf_leave_solict(ifp->idev, &ifp->addr);
3789 dst_hold(&ifp->rt->u.dst);
3790 if (ip6_del_rt(ifp->rt))
3791 dst_free(&ifp->rt->u.dst);
3792 break;
3793 }
3794 }
3795
3796 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3797 {
3798 rcu_read_lock_bh();
3799 if (likely(ifp->idev->dead == 0))
3800 __ipv6_ifa_notify(event, ifp);
3801 rcu_read_unlock_bh();
3802 }
3803
3804 #ifdef CONFIG_SYSCTL
3805
3806 static
3807 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3808 void __user *buffer, size_t *lenp, loff_t *ppos)
3809 {
3810 int *valp = ctl->data;
3811 int val = *valp;
3812 int ret;
3813
3814 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3815
3816 if (write)
3817 addrconf_fixup_forwarding(ctl, valp, val);
3818 return ret;
3819 }
3820
3821 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3822 int __user *name, int nlen,
3823 void __user *oldval,
3824 size_t __user *oldlenp,
3825 void __user *newval, size_t newlen)
3826 {
3827 int *valp = table->data;
3828 int val = *valp;
3829 int new;
3830
3831 if (!newval || !newlen)
3832 return 0;
3833 if (newlen != sizeof(int))
3834 return -EINVAL;
3835 if (get_user(new, (int __user *)newval))
3836 return -EFAULT;
3837 if (new == *valp)
3838 return 0;
3839 if (oldval && oldlenp) {
3840 size_t len;
3841 if (get_user(len, oldlenp))
3842 return -EFAULT;
3843 if (len) {
3844 if (len > table->maxlen)
3845 len = table->maxlen;
3846 if (copy_to_user(oldval, valp, len))
3847 return -EFAULT;
3848 if (put_user(len, oldlenp))
3849 return -EFAULT;
3850 }
3851 }
3852
3853 *valp = new;
3854 addrconf_fixup_forwarding(table, valp, val);
3855 return 1;
3856 }
3857
3858 static struct addrconf_sysctl_table
3859 {
3860 struct ctl_table_header *sysctl_header;
3861 ctl_table addrconf_vars[__NET_IPV6_MAX];
3862 char *dev_name;
3863 } addrconf_sysctl __read_mostly = {
3864 .sysctl_header = NULL,
3865 .addrconf_vars = {
3866 {
3867 .ctl_name = NET_IPV6_FORWARDING,
3868 .procname = "forwarding",
3869 .data = &ipv6_devconf.forwarding,
3870 .maxlen = sizeof(int),
3871 .mode = 0644,
3872 .proc_handler = &addrconf_sysctl_forward,
3873 .strategy = &addrconf_sysctl_forward_strategy,
3874 },
3875 {
3876 .ctl_name = NET_IPV6_HOP_LIMIT,
3877 .procname = "hop_limit",
3878 .data = &ipv6_devconf.hop_limit,
3879 .maxlen = sizeof(int),
3880 .mode = 0644,
3881 .proc_handler = proc_dointvec,
3882 },
3883 {
3884 .ctl_name = NET_IPV6_MTU,
3885 .procname = "mtu",
3886 .data = &ipv6_devconf.mtu6,
3887 .maxlen = sizeof(int),
3888 .mode = 0644,
3889 .proc_handler = &proc_dointvec,
3890 },
3891 {
3892 .ctl_name = NET_IPV6_ACCEPT_RA,
3893 .procname = "accept_ra",
3894 .data = &ipv6_devconf.accept_ra,
3895 .maxlen = sizeof(int),
3896 .mode = 0644,
3897 .proc_handler = &proc_dointvec,
3898 },
3899 {
3900 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3901 .procname = "accept_redirects",
3902 .data = &ipv6_devconf.accept_redirects,
3903 .maxlen = sizeof(int),
3904 .mode = 0644,
3905 .proc_handler = &proc_dointvec,
3906 },
3907 {
3908 .ctl_name = NET_IPV6_AUTOCONF,
3909 .procname = "autoconf",
3910 .data = &ipv6_devconf.autoconf,
3911 .maxlen = sizeof(int),
3912 .mode = 0644,
3913 .proc_handler = &proc_dointvec,
3914 },
3915 {
3916 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3917 .procname = "dad_transmits",
3918 .data = &ipv6_devconf.dad_transmits,
3919 .maxlen = sizeof(int),
3920 .mode = 0644,
3921 .proc_handler = &proc_dointvec,
3922 },
3923 {
3924 .ctl_name = NET_IPV6_RTR_SOLICITS,
3925 .procname = "router_solicitations",
3926 .data = &ipv6_devconf.rtr_solicits,
3927 .maxlen = sizeof(int),
3928 .mode = 0644,
3929 .proc_handler = &proc_dointvec,
3930 },
3931 {
3932 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3933 .procname = "router_solicitation_interval",
3934 .data = &ipv6_devconf.rtr_solicit_interval,
3935 .maxlen = sizeof(int),
3936 .mode = 0644,
3937 .proc_handler = &proc_dointvec_jiffies,
3938 .strategy = &sysctl_jiffies,
3939 },
3940 {
3941 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3942 .procname = "router_solicitation_delay",
3943 .data = &ipv6_devconf.rtr_solicit_delay,
3944 .maxlen = sizeof(int),
3945 .mode = 0644,
3946 .proc_handler = &proc_dointvec_jiffies,
3947 .strategy = &sysctl_jiffies,
3948 },
3949 {
3950 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3951 .procname = "force_mld_version",
3952 .data = &ipv6_devconf.force_mld_version,
3953 .maxlen = sizeof(int),
3954 .mode = 0644,
3955 .proc_handler = &proc_dointvec,
3956 },
3957 #ifdef CONFIG_IPV6_PRIVACY
3958 {
3959 .ctl_name = NET_IPV6_USE_TEMPADDR,
3960 .procname = "use_tempaddr",
3961 .data = &ipv6_devconf.use_tempaddr,
3962 .maxlen = sizeof(int),
3963 .mode = 0644,
3964 .proc_handler = &proc_dointvec,
3965 },
3966 {
3967 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3968 .procname = "temp_valid_lft",
3969 .data = &ipv6_devconf.temp_valid_lft,
3970 .maxlen = sizeof(int),
3971 .mode = 0644,
3972 .proc_handler = &proc_dointvec,
3973 },
3974 {
3975 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3976 .procname = "temp_prefered_lft",
3977 .data = &ipv6_devconf.temp_prefered_lft,
3978 .maxlen = sizeof(int),
3979 .mode = 0644,
3980 .proc_handler = &proc_dointvec,
3981 },
3982 {
3983 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3984 .procname = "regen_max_retry",
3985 .data = &ipv6_devconf.regen_max_retry,
3986 .maxlen = sizeof(int),
3987 .mode = 0644,
3988 .proc_handler = &proc_dointvec,
3989 },
3990 {
3991 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3992 .procname = "max_desync_factor",
3993 .data = &ipv6_devconf.max_desync_factor,
3994 .maxlen = sizeof(int),
3995 .mode = 0644,
3996 .proc_handler = &proc_dointvec,
3997 },
3998 #endif
3999 {
4000 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4001 .procname = "max_addresses",
4002 .data = &ipv6_devconf.max_addresses,
4003 .maxlen = sizeof(int),
4004 .mode = 0644,
4005 .proc_handler = &proc_dointvec,
4006 },
4007 {
4008 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4009 .procname = "accept_ra_defrtr",
4010 .data = &ipv6_devconf.accept_ra_defrtr,
4011 .maxlen = sizeof(int),
4012 .mode = 0644,
4013 .proc_handler = &proc_dointvec,
4014 },
4015 {
4016 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4017 .procname = "accept_ra_pinfo",
4018 .data = &ipv6_devconf.accept_ra_pinfo,
4019 .maxlen = sizeof(int),
4020 .mode = 0644,
4021 .proc_handler = &proc_dointvec,
4022 },
4023 #ifdef CONFIG_IPV6_ROUTER_PREF
4024 {
4025 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4026 .procname = "accept_ra_rtr_pref",
4027 .data = &ipv6_devconf.accept_ra_rtr_pref,
4028 .maxlen = sizeof(int),
4029 .mode = 0644,
4030 .proc_handler = &proc_dointvec,
4031 },
4032 {
4033 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4034 .procname = "router_probe_interval",
4035 .data = &ipv6_devconf.rtr_probe_interval,
4036 .maxlen = sizeof(int),
4037 .mode = 0644,
4038 .proc_handler = &proc_dointvec_jiffies,
4039 .strategy = &sysctl_jiffies,
4040 },
4041 #ifdef CONFIG_IPV6_ROUTE_INFO
4042 {
4043 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4044 .procname = "accept_ra_rt_info_max_plen",
4045 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4046 .maxlen = sizeof(int),
4047 .mode = 0644,
4048 .proc_handler = &proc_dointvec,
4049 },
4050 #endif
4051 #endif
4052 {
4053 .ctl_name = NET_IPV6_PROXY_NDP,
4054 .procname = "proxy_ndp",
4055 .data = &ipv6_devconf.proxy_ndp,
4056 .maxlen = sizeof(int),
4057 .mode = 0644,
4058 .proc_handler = &proc_dointvec,
4059 },
4060 {
4061 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4062 .procname = "accept_source_route",
4063 .data = &ipv6_devconf.accept_source_route,
4064 .maxlen = sizeof(int),
4065 .mode = 0644,
4066 .proc_handler = &proc_dointvec,
4067 },
4068 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4069 {
4070 .ctl_name = CTL_UNNUMBERED,
4071 .procname = "optimistic_dad",
4072 .data = &ipv6_devconf.optimistic_dad,
4073 .maxlen = sizeof(int),
4074 .mode = 0644,
4075 .proc_handler = &proc_dointvec,
4076
4077 },
4078 #endif
4079 {
4080 .ctl_name = 0, /* sentinel */
4081 }
4082 },
4083 };
4084
4085 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4086 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4087 {
4088 int i;
4089 struct addrconf_sysctl_table *t;
4090
4091 #define ADDRCONF_CTL_PATH_DEV 3
4092
4093 struct ctl_path addrconf_ctl_path[] = {
4094 { .procname = "net", .ctl_name = CTL_NET, },
4095 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4096 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4097 { /* to be set */ },
4098 { },
4099 };
4100
4101
4102 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4103 if (t == NULL)
4104 goto out;
4105
4106 for (i=0; t->addrconf_vars[i].data; i++) {
4107 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4108 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4109 t->addrconf_vars[i].extra2 = net;
4110 }
4111
4112 /*
4113 * Make a copy of dev_name, because '.procname' is regarded as const
4114 * by sysctl and we wouldn't want anyone to change it under our feet
4115 * (see SIOCSIFNAME).
4116 */
4117 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4118 if (!t->dev_name)
4119 goto free;
4120
4121 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4122 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4123
4124 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4125 t->addrconf_vars);
4126 if (t->sysctl_header == NULL)
4127 goto free_procname;
4128
4129 p->sysctl = t;
4130 return 0;
4131
4132 free_procname:
4133 kfree(t->dev_name);
4134 free:
4135 kfree(t);
4136 out:
4137 return -ENOBUFS;
4138 }
4139
4140 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4141 {
4142 struct addrconf_sysctl_table *t;
4143
4144 if (p->sysctl == NULL)
4145 return;
4146
4147 t = p->sysctl;
4148 p->sysctl = NULL;
4149 unregister_sysctl_table(t->sysctl_header);
4150 kfree(t->dev_name);
4151 kfree(t);
4152 }
4153
4154 static void addrconf_sysctl_register(struct inet6_dev *idev)
4155 {
4156 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4157 NET_IPV6_NEIGH, "ipv6",
4158 &ndisc_ifinfo_sysctl_change,
4159 NULL);
4160 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4161 idev->dev->ifindex, idev, &idev->cnf);
4162 }
4163
4164 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4165 {
4166 __addrconf_sysctl_unregister(&idev->cnf);
4167 neigh_sysctl_unregister(idev->nd_parms);
4168 }
4169
4170
4171 #endif
4172
4173 static int addrconf_init_net(struct net *net)
4174 {
4175 int err;
4176 struct ipv6_devconf *all, *dflt;
4177
4178 err = -ENOMEM;
4179 all = &ipv6_devconf;
4180 dflt = &ipv6_devconf_dflt;
4181
4182 if (net != &init_net) {
4183 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4184 if (all == NULL)
4185 goto err_alloc_all;
4186
4187 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4188 if (dflt == NULL)
4189 goto err_alloc_dflt;
4190 }
4191
4192 net->ipv6.devconf_all = all;
4193 net->ipv6.devconf_dflt = dflt;
4194
4195 #ifdef CONFIG_SYSCTL
4196 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4197 NULL, all);
4198 if (err < 0)
4199 goto err_reg_all;
4200
4201 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4202 NULL, dflt);
4203 if (err < 0)
4204 goto err_reg_dflt;
4205 #endif
4206 return 0;
4207
4208 #ifdef CONFIG_SYSCTL
4209 err_reg_dflt:
4210 __addrconf_sysctl_unregister(all);
4211 err_reg_all:
4212 kfree(dflt);
4213 #endif
4214 err_alloc_dflt:
4215 kfree(all);
4216 err_alloc_all:
4217 return err;
4218 }
4219
4220 static void addrconf_exit_net(struct net *net)
4221 {
4222 #ifdef CONFIG_SYSCTL
4223 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4224 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4225 #endif
4226 if (net != &init_net) {
4227 kfree(net->ipv6.devconf_dflt);
4228 kfree(net->ipv6.devconf_all);
4229 }
4230 }
4231
4232 static struct pernet_operations addrconf_ops = {
4233 .init = addrconf_init_net,
4234 .exit = addrconf_exit_net,
4235 };
4236
4237 /*
4238 * Device notifier
4239 */
4240
4241 int register_inet6addr_notifier(struct notifier_block *nb)
4242 {
4243 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4244 }
4245
4246 EXPORT_SYMBOL(register_inet6addr_notifier);
4247
4248 int unregister_inet6addr_notifier(struct notifier_block *nb)
4249 {
4250 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4251 }
4252
4253 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4254
4255
4256 static int addrconf_net_init(struct net *net)
4257 {
4258 return 0;
4259 }
4260
4261 static void addrconf_net_exit(struct net *net)
4262 {
4263 struct net_device *dev;
4264
4265 rtnl_lock();
4266 /* clean dev list */
4267 for_each_netdev(net, dev) {
4268 if (__in6_dev_get(dev) == NULL)
4269 continue;
4270 addrconf_ifdown(dev, 1);
4271 }
4272 addrconf_ifdown(net->loopback_dev, 2);
4273 rtnl_unlock();
4274 }
4275
4276 static struct pernet_operations addrconf_net_ops = {
4277 .init = addrconf_net_init,
4278 .exit = addrconf_net_exit,
4279 };
4280
4281 /*
4282 * Init / cleanup code
4283 */
4284
4285 int __init addrconf_init(void)
4286 {
4287 int err;
4288
4289 if ((err = ipv6_addr_label_init()) < 0) {
4290 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4291 err);
4292 return err;
4293 }
4294
4295 register_pernet_subsys(&addrconf_ops);
4296
4297 /* The addrconf netdev notifier requires that loopback_dev
4298 * has it's ipv6 private information allocated and setup
4299 * before it can bring up and give link-local addresses
4300 * to other devices which are up.
4301 *
4302 * Unfortunately, loopback_dev is not necessarily the first
4303 * entry in the global dev_base list of net devices. In fact,
4304 * it is likely to be the very last entry on that list.
4305 * So this causes the notifier registry below to try and
4306 * give link-local addresses to all devices besides loopback_dev
4307 * first, then loopback_dev, which cases all the non-loopback_dev
4308 * devices to fail to get a link-local address.
4309 *
4310 * So, as a temporary fix, allocate the ipv6 structure for
4311 * loopback_dev first by hand.
4312 * Longer term, all of the dependencies ipv6 has upon the loopback
4313 * device and it being up should be removed.
4314 */
4315 rtnl_lock();
4316 if (!ipv6_add_dev(init_net.loopback_dev))
4317 err = -ENOMEM;
4318 rtnl_unlock();
4319 if (err)
4320 goto errlo;
4321
4322 err = register_pernet_device(&addrconf_net_ops);
4323 if (err)
4324 return err;
4325
4326 register_netdevice_notifier(&ipv6_dev_notf);
4327
4328 addrconf_verify(0);
4329
4330 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4331 if (err < 0)
4332 goto errout;
4333
4334 /* Only the first call to __rtnl_register can fail */
4335 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4336 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4337 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4338 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4339 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4340
4341 ipv6_addr_label_rtnl_register();
4342
4343 return 0;
4344 errout:
4345 unregister_netdevice_notifier(&ipv6_dev_notf);
4346 errlo:
4347 unregister_pernet_subsys(&addrconf_ops);
4348
4349 return err;
4350 }
4351
4352 void addrconf_cleanup(void)
4353 {
4354 struct inet6_ifaddr *ifa;
4355 int i;
4356
4357 unregister_netdevice_notifier(&ipv6_dev_notf);
4358 unregister_pernet_device(&addrconf_net_ops);
4359
4360 unregister_pernet_subsys(&addrconf_ops);
4361
4362 rtnl_lock();
4363
4364 /*
4365 * Check hash table.
4366 */
4367 write_lock_bh(&addrconf_hash_lock);
4368 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4369 for (ifa=inet6_addr_lst[i]; ifa; ) {
4370 struct inet6_ifaddr *bifa;
4371
4372 bifa = ifa;
4373 ifa = ifa->lst_next;
4374 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4375 /* Do not free it; something is wrong.
4376 Now we can investigate it with debugger.
4377 */
4378 }
4379 }
4380 write_unlock_bh(&addrconf_hash_lock);
4381
4382 del_timer(&addr_chk_timer);
4383 rtnl_unlock();
4384
4385 unregister_pernet_subsys(&addrconf_net_ops);
4386 }
Linux 2.6 libata-dev (mirror)