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[GitHub/moto-9609/android_kernel_motorola_exynos9610.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $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->nd_net->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 __FUNCTION__, 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 __FUNCTION__, 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(idev->dev->nd_net, 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 = ifp->idev->dev->nd_net;
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 struct ipv6_saddr_score {
881 int addr_type;
882 unsigned int attrs;
883 int matchlen;
884 int scope;
885 unsigned int rule;
886 };
887
888 #define IPV6_SADDR_SCORE_LOCAL 0x0001
889 #define IPV6_SADDR_SCORE_PREFERRED 0x0004
890 #define IPV6_SADDR_SCORE_HOA 0x0008
891 #define IPV6_SADDR_SCORE_OIF 0x0010
892 #define IPV6_SADDR_SCORE_LABEL 0x0020
893 #define IPV6_SADDR_SCORE_PRIVACY 0x0040
894
895 static inline int ipv6_saddr_preferred(int type)
896 {
897 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
898 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
899 return 1;
900 return 0;
901 }
902
903 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
904 struct in6_addr *daddr, struct in6_addr *saddr)
905 {
906 struct ipv6_saddr_score hiscore;
907 struct inet6_ifaddr *ifa_result = NULL;
908 struct net *net = daddr_dev->nd_net;
909 int daddr_type = __ipv6_addr_type(daddr);
910 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
911 int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
912 u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
913 struct net_device *dev;
914
915 memset(&hiscore, 0, sizeof(hiscore));
916
917 read_lock(&dev_base_lock);
918 rcu_read_lock();
919
920 for_each_netdev(net, dev) {
921 struct inet6_dev *idev;
922 struct inet6_ifaddr *ifa;
923
924 /* Rule 0: Candidate Source Address (section 4)
925 * - multicast and link-local destination address,
926 * the set of candidate source address MUST only
927 * include addresses assigned to interfaces
928 * belonging to the same link as the outgoing
929 * interface.
930 * (- For site-local destination addresses, the
931 * set of candidate source addresses MUST only
932 * include addresses assigned to interfaces
933 * belonging to the same site as the outgoing
934 * interface.)
935 */
936 if ((daddr_type & IPV6_ADDR_MULTICAST ||
937 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
938 daddr_dev && dev != daddr_dev)
939 continue;
940
941 idev = __in6_dev_get(dev);
942 if (!idev)
943 continue;
944
945 read_lock_bh(&idev->lock);
946 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
947 struct ipv6_saddr_score score;
948
949 score.addr_type = __ipv6_addr_type(&ifa->addr);
950
951 /* Rule 0:
952 * - Tentative Address (RFC2462 section 5.4)
953 * - A tentative address is not considered
954 * "assigned to an interface" in the traditional
955 * sense, unless it is also flagged as optimistic.
956 * - Candidate Source Address (section 4)
957 * - In any case, anycast addresses, multicast
958 * addresses, and the unspecified address MUST
959 * NOT be included in a candidate set.
960 */
961 if ((ifa->flags & IFA_F_TENTATIVE) &&
962 (!(ifa->flags & IFA_F_OPTIMISTIC)))
963 continue;
964 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
965 score.addr_type & IPV6_ADDR_MULTICAST)) {
966 LIMIT_NETDEBUG(KERN_DEBUG
967 "ADDRCONF: unspecified / multicast address "
968 "assigned as unicast address on %s",
969 dev->name);
970 continue;
971 }
972
973 score.attrs = 0;
974 score.matchlen = 0;
975 score.scope = 0;
976 score.rule = 0;
977
978 if (ifa_result == NULL) {
979 /* record it if the first available entry */
980 goto record_it;
981 }
982
983 /* Rule 1: Prefer same address */
984 if (hiscore.rule < 1) {
985 if (ipv6_addr_equal(&ifa_result->addr, daddr))
986 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
987 hiscore.rule++;
988 }
989 if (ipv6_addr_equal(&ifa->addr, daddr)) {
990 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
991 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
992 score.rule = 1;
993 goto record_it;
994 }
995 } else {
996 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
997 continue;
998 }
999
1000 /* Rule 2: Prefer appropriate scope */
1001 if (hiscore.rule < 2) {
1002 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1003 hiscore.rule++;
1004 }
1005 score.scope = __ipv6_addr_src_scope(score.addr_type);
1006 if (hiscore.scope < score.scope) {
1007 if (hiscore.scope < daddr_scope) {
1008 score.rule = 2;
1009 goto record_it;
1010 } else
1011 continue;
1012 } else if (score.scope < hiscore.scope) {
1013 if (score.scope < daddr_scope)
1014 break; /* addresses sorted by scope */
1015 else {
1016 score.rule = 2;
1017 goto record_it;
1018 }
1019 }
1020
1021 /* Rule 3: Avoid deprecated and optimistic addresses */
1022 if (hiscore.rule < 3) {
1023 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1024 (((ifa_result->flags &
1025 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1026 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1027 hiscore.rule++;
1028 }
1029 if (ipv6_saddr_preferred(score.addr_type) ||
1030 (((ifa->flags &
1031 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1032 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1033 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1034 score.rule = 3;
1035 goto record_it;
1036 }
1037 } else {
1038 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1039 continue;
1040 }
1041
1042 /* Rule 4: Prefer home address */
1043 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1044 if (hiscore.rule < 4) {
1045 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1046 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1047 hiscore.rule++;
1048 }
1049 if (ifa->flags & IFA_F_HOMEADDRESS) {
1050 score.attrs |= IPV6_SADDR_SCORE_HOA;
1051 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1052 score.rule = 4;
1053 goto record_it;
1054 }
1055 } else {
1056 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1057 continue;
1058 }
1059 #else
1060 if (hiscore.rule < 4)
1061 hiscore.rule++;
1062 #endif
1063
1064 /* Rule 5: Prefer outgoing interface */
1065 if (hiscore.rule < 5) {
1066 if (daddr_dev == NULL ||
1067 daddr_dev == ifa_result->idev->dev)
1068 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1069 hiscore.rule++;
1070 }
1071 if (daddr_dev == NULL ||
1072 daddr_dev == ifa->idev->dev) {
1073 score.attrs |= IPV6_SADDR_SCORE_OIF;
1074 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1075 score.rule = 5;
1076 goto record_it;
1077 }
1078 } else {
1079 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1080 continue;
1081 }
1082
1083 /* Rule 6: Prefer matching label */
1084 if (hiscore.rule < 6) {
1085 if (ipv6_addr_label(&ifa_result->addr,
1086 hiscore.addr_type,
1087 ifa_result->idev->dev->ifindex) == daddr_label)
1088 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1089 hiscore.rule++;
1090 }
1091 if (ipv6_addr_label(&ifa->addr,
1092 score.addr_type,
1093 ifa->idev->dev->ifindex) == daddr_label) {
1094 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1095 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1096 score.rule = 6;
1097 goto record_it;
1098 }
1099 } else {
1100 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1101 continue;
1102 }
1103
1104 #ifdef CONFIG_IPV6_PRIVACY
1105 /* Rule 7: Prefer public address
1106 * Note: prefer temprary address if use_tempaddr >= 2
1107 */
1108 if (hiscore.rule < 7) {
1109 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1110 (ifa_result->idev->cnf.use_tempaddr >= 2))
1111 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1112 hiscore.rule++;
1113 }
1114 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1115 (ifa->idev->cnf.use_tempaddr >= 2)) {
1116 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1117 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1118 score.rule = 7;
1119 goto record_it;
1120 }
1121 } else {
1122 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1123 continue;
1124 }
1125 #else
1126 if (hiscore.rule < 7)
1127 hiscore.rule++;
1128 #endif
1129
1130 /* Skip rule 8 for orchid -> non-orchid address pairs. */
1131 if (ipv6_addr_orchid(&ifa->addr) && !ipv6_addr_orchid(daddr))
1132 continue;
1133
1134 /* Rule 8: Use longest matching prefix */
1135 if (hiscore.rule < 8) {
1136 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1137 hiscore.rule++;
1138 }
1139 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1140 if (score.matchlen > hiscore.matchlen) {
1141 score.rule = 8;
1142 goto record_it;
1143 }
1144 #if 0
1145 else if (score.matchlen < hiscore.matchlen)
1146 continue;
1147 #endif
1148
1149 /* Final Rule: choose first available one */
1150 continue;
1151 record_it:
1152 if (ifa_result)
1153 in6_ifa_put(ifa_result);
1154 in6_ifa_hold(ifa);
1155 ifa_result = ifa;
1156 hiscore = score;
1157 }
1158 read_unlock_bh(&idev->lock);
1159 }
1160 rcu_read_unlock();
1161 read_unlock(&dev_base_lock);
1162
1163 if (!ifa_result)
1164 return -EADDRNOTAVAIL;
1165
1166 ipv6_addr_copy(saddr, &ifa_result->addr);
1167 in6_ifa_put(ifa_result);
1168 return 0;
1169 }
1170
1171 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1172
1173 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1174 unsigned char banned_flags)
1175 {
1176 struct inet6_dev *idev;
1177 int err = -EADDRNOTAVAIL;
1178
1179 rcu_read_lock();
1180 if ((idev = __in6_dev_get(dev)) != NULL) {
1181 struct inet6_ifaddr *ifp;
1182
1183 read_lock_bh(&idev->lock);
1184 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1185 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1186 ipv6_addr_copy(addr, &ifp->addr);
1187 err = 0;
1188 break;
1189 }
1190 }
1191 read_unlock_bh(&idev->lock);
1192 }
1193 rcu_read_unlock();
1194 return err;
1195 }
1196
1197 static int ipv6_count_addresses(struct inet6_dev *idev)
1198 {
1199 int cnt = 0;
1200 struct inet6_ifaddr *ifp;
1201
1202 read_lock_bh(&idev->lock);
1203 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1204 cnt++;
1205 read_unlock_bh(&idev->lock);
1206 return cnt;
1207 }
1208
1209 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1210 struct net_device *dev, int strict)
1211 {
1212 struct inet6_ifaddr * ifp;
1213 u8 hash = ipv6_addr_hash(addr);
1214
1215 read_lock_bh(&addrconf_hash_lock);
1216 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1217 if (ifp->idev->dev->nd_net != net)
1218 continue;
1219 if (ipv6_addr_equal(&ifp->addr, addr) &&
1220 !(ifp->flags&IFA_F_TENTATIVE)) {
1221 if (dev == NULL || ifp->idev->dev == dev ||
1222 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1223 break;
1224 }
1225 }
1226 read_unlock_bh(&addrconf_hash_lock);
1227 return ifp != NULL;
1228 }
1229 EXPORT_SYMBOL(ipv6_chk_addr);
1230
1231 static
1232 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1233 struct net_device *dev)
1234 {
1235 struct inet6_ifaddr * ifp;
1236 u8 hash = ipv6_addr_hash(addr);
1237
1238 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1239 if (ifp->idev->dev->nd_net != net)
1240 continue;
1241 if (ipv6_addr_equal(&ifp->addr, addr)) {
1242 if (dev == NULL || ifp->idev->dev == dev)
1243 break;
1244 }
1245 }
1246 return ifp != NULL;
1247 }
1248
1249 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1250 struct net_device *dev, int strict)
1251 {
1252 struct inet6_ifaddr * ifp;
1253 u8 hash = ipv6_addr_hash(addr);
1254
1255 read_lock_bh(&addrconf_hash_lock);
1256 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1257 if (ifp->idev->dev->nd_net != net)
1258 continue;
1259 if (ipv6_addr_equal(&ifp->addr, addr)) {
1260 if (dev == NULL || ifp->idev->dev == dev ||
1261 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1262 in6_ifa_hold(ifp);
1263 break;
1264 }
1265 }
1266 }
1267 read_unlock_bh(&addrconf_hash_lock);
1268
1269 return ifp;
1270 }
1271
1272 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1273 {
1274 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1275 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1276 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1277 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1278 int sk_ipv6only = ipv6_only_sock(sk);
1279 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1280 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1281 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1282
1283 if (!sk2_rcv_saddr && !sk_ipv6only)
1284 return 1;
1285
1286 if (addr_type2 == IPV6_ADDR_ANY &&
1287 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1288 return 1;
1289
1290 if (addr_type == IPV6_ADDR_ANY &&
1291 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1292 return 1;
1293
1294 if (sk2_rcv_saddr6 &&
1295 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1296 return 1;
1297
1298 if (addr_type == IPV6_ADDR_MAPPED &&
1299 !sk2_ipv6only &&
1300 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1301 return 1;
1302
1303 return 0;
1304 }
1305
1306 /* Gets referenced address, destroys ifaddr */
1307
1308 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1309 {
1310 if (ifp->flags&IFA_F_PERMANENT) {
1311 spin_lock_bh(&ifp->lock);
1312 addrconf_del_timer(ifp);
1313 ifp->flags |= IFA_F_TENTATIVE;
1314 spin_unlock_bh(&ifp->lock);
1315 in6_ifa_put(ifp);
1316 #ifdef CONFIG_IPV6_PRIVACY
1317 } else if (ifp->flags&IFA_F_TEMPORARY) {
1318 struct inet6_ifaddr *ifpub;
1319 spin_lock_bh(&ifp->lock);
1320 ifpub = ifp->ifpub;
1321 if (ifpub) {
1322 in6_ifa_hold(ifpub);
1323 spin_unlock_bh(&ifp->lock);
1324 ipv6_create_tempaddr(ifpub, ifp);
1325 in6_ifa_put(ifpub);
1326 } else {
1327 spin_unlock_bh(&ifp->lock);
1328 }
1329 ipv6_del_addr(ifp);
1330 #endif
1331 } else
1332 ipv6_del_addr(ifp);
1333 }
1334
1335 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1336 {
1337 if (net_ratelimit())
1338 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1339 addrconf_dad_stop(ifp);
1340 }
1341
1342 /* Join to solicited addr multicast group. */
1343
1344 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1345 {
1346 struct in6_addr maddr;
1347
1348 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1349 return;
1350
1351 addrconf_addr_solict_mult(addr, &maddr);
1352 ipv6_dev_mc_inc(dev, &maddr);
1353 }
1354
1355 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1356 {
1357 struct in6_addr maddr;
1358
1359 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1360 return;
1361
1362 addrconf_addr_solict_mult(addr, &maddr);
1363 __ipv6_dev_mc_dec(idev, &maddr);
1364 }
1365
1366 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1367 {
1368 struct in6_addr addr;
1369 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1370 if (ipv6_addr_any(&addr))
1371 return;
1372 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1373 }
1374
1375 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1376 {
1377 struct in6_addr addr;
1378 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1379 if (ipv6_addr_any(&addr))
1380 return;
1381 __ipv6_dev_ac_dec(ifp->idev, &addr);
1382 }
1383
1384 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1385 {
1386 if (dev->addr_len != ETH_ALEN)
1387 return -1;
1388 memcpy(eui, dev->dev_addr, 3);
1389 memcpy(eui + 5, dev->dev_addr + 3, 3);
1390
1391 /*
1392 * The zSeries OSA network cards can be shared among various
1393 * OS instances, but the OSA cards have only one MAC address.
1394 * This leads to duplicate address conflicts in conjunction
1395 * with IPv6 if more than one instance uses the same card.
1396 *
1397 * The driver for these cards can deliver a unique 16-bit
1398 * identifier for each instance sharing the same card. It is
1399 * placed instead of 0xFFFE in the interface identifier. The
1400 * "u" bit of the interface identifier is not inverted in this
1401 * case. Hence the resulting interface identifier has local
1402 * scope according to RFC2373.
1403 */
1404 if (dev->dev_id) {
1405 eui[3] = (dev->dev_id >> 8) & 0xFF;
1406 eui[4] = dev->dev_id & 0xFF;
1407 } else {
1408 eui[3] = 0xFF;
1409 eui[4] = 0xFE;
1410 eui[0] ^= 2;
1411 }
1412 return 0;
1413 }
1414
1415 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1416 {
1417 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1418 if (dev->addr_len != ARCNET_ALEN)
1419 return -1;
1420 memset(eui, 0, 7);
1421 eui[7] = *(u8*)dev->dev_addr;
1422 return 0;
1423 }
1424
1425 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1426 {
1427 if (dev->addr_len != INFINIBAND_ALEN)
1428 return -1;
1429 memcpy(eui, dev->dev_addr + 12, 8);
1430 eui[0] |= 2;
1431 return 0;
1432 }
1433
1434 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1435 {
1436 switch (dev->type) {
1437 case ARPHRD_ETHER:
1438 case ARPHRD_FDDI:
1439 case ARPHRD_IEEE802_TR:
1440 return addrconf_ifid_eui48(eui, dev);
1441 case ARPHRD_ARCNET:
1442 return addrconf_ifid_arcnet(eui, dev);
1443 case ARPHRD_INFINIBAND:
1444 return addrconf_ifid_infiniband(eui, dev);
1445 case ARPHRD_SIT:
1446 if (dev->priv_flags & IFF_ISATAP)
1447 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1448 }
1449 return -1;
1450 }
1451
1452 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1453 {
1454 int err = -1;
1455 struct inet6_ifaddr *ifp;
1456
1457 read_lock_bh(&idev->lock);
1458 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1459 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1460 memcpy(eui, ifp->addr.s6_addr+8, 8);
1461 err = 0;
1462 break;
1463 }
1464 }
1465 read_unlock_bh(&idev->lock);
1466 return err;
1467 }
1468
1469 #ifdef CONFIG_IPV6_PRIVACY
1470 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1471 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1472 {
1473 regen:
1474 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1475 idev->rndid[0] &= ~0x02;
1476
1477 /*
1478 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1479 * check if generated address is not inappropriate
1480 *
1481 * - Reserved subnet anycast (RFC 2526)
1482 * 11111101 11....11 1xxxxxxx
1483 * - ISATAP (RFC4214) 6.1
1484 * 00-00-5E-FE-xx-xx-xx-xx
1485 * - value 0
1486 * - XXX: already assigned to an address on the device
1487 */
1488 if (idev->rndid[0] == 0xfd &&
1489 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1490 (idev->rndid[7]&0x80))
1491 goto regen;
1492 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1493 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1494 goto regen;
1495 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1496 goto regen;
1497 }
1498
1499 return 0;
1500 }
1501
1502 static void ipv6_regen_rndid(unsigned long data)
1503 {
1504 struct inet6_dev *idev = (struct inet6_dev *) data;
1505 unsigned long expires;
1506
1507 rcu_read_lock_bh();
1508 write_lock_bh(&idev->lock);
1509
1510 if (idev->dead)
1511 goto out;
1512
1513 if (__ipv6_regen_rndid(idev) < 0)
1514 goto out;
1515
1516 expires = jiffies +
1517 idev->cnf.temp_prefered_lft * HZ -
1518 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1519 if (time_before(expires, jiffies)) {
1520 printk(KERN_WARNING
1521 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1522 idev->dev->name);
1523 goto out;
1524 }
1525
1526 if (!mod_timer(&idev->regen_timer, expires))
1527 in6_dev_hold(idev);
1528
1529 out:
1530 write_unlock_bh(&idev->lock);
1531 rcu_read_unlock_bh();
1532 in6_dev_put(idev);
1533 }
1534
1535 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1536 int ret = 0;
1537
1538 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1539 ret = __ipv6_regen_rndid(idev);
1540 return ret;
1541 }
1542 #endif
1543
1544 /*
1545 * Add prefix route.
1546 */
1547
1548 static void
1549 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1550 unsigned long expires, u32 flags)
1551 {
1552 struct fib6_config cfg = {
1553 .fc_table = RT6_TABLE_PREFIX,
1554 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1555 .fc_ifindex = dev->ifindex,
1556 .fc_expires = expires,
1557 .fc_dst_len = plen,
1558 .fc_flags = RTF_UP | flags,
1559 .fc_nlinfo.nl_net = dev->nd_net,
1560 };
1561
1562 ipv6_addr_copy(&cfg.fc_dst, pfx);
1563
1564 /* Prevent useless cloning on PtP SIT.
1565 This thing is done here expecting that the whole
1566 class of non-broadcast devices need not cloning.
1567 */
1568 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1569 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1570 cfg.fc_flags |= RTF_NONEXTHOP;
1571 #endif
1572
1573 ip6_route_add(&cfg);
1574 }
1575
1576 /* Create "default" multicast route to the interface */
1577
1578 static void addrconf_add_mroute(struct net_device *dev)
1579 {
1580 struct fib6_config cfg = {
1581 .fc_table = RT6_TABLE_LOCAL,
1582 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1583 .fc_ifindex = dev->ifindex,
1584 .fc_dst_len = 8,
1585 .fc_flags = RTF_UP,
1586 .fc_nlinfo.nl_net = dev->nd_net,
1587 };
1588
1589 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1590
1591 ip6_route_add(&cfg);
1592 }
1593
1594 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1595 static void sit_route_add(struct net_device *dev)
1596 {
1597 struct fib6_config cfg = {
1598 .fc_table = RT6_TABLE_MAIN,
1599 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1600 .fc_ifindex = dev->ifindex,
1601 .fc_dst_len = 96,
1602 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1603 .fc_nlinfo.nl_net = dev->nd_net,
1604 };
1605
1606 /* prefix length - 96 bits "::d.d.d.d" */
1607 ip6_route_add(&cfg);
1608 }
1609 #endif
1610
1611 static void addrconf_add_lroute(struct net_device *dev)
1612 {
1613 struct in6_addr addr;
1614
1615 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1616 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1617 }
1618
1619 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1620 {
1621 struct inet6_dev *idev;
1622
1623 ASSERT_RTNL();
1624
1625 if ((idev = ipv6_find_idev(dev)) == NULL)
1626 return NULL;
1627
1628 /* Add default multicast route */
1629 addrconf_add_mroute(dev);
1630
1631 /* Add link local route */
1632 addrconf_add_lroute(dev);
1633 return idev;
1634 }
1635
1636 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1637 {
1638 struct prefix_info *pinfo;
1639 __u32 valid_lft;
1640 __u32 prefered_lft;
1641 int addr_type;
1642 unsigned long rt_expires;
1643 struct inet6_dev *in6_dev;
1644
1645 pinfo = (struct prefix_info *) opt;
1646
1647 if (len < sizeof(struct prefix_info)) {
1648 ADBG(("addrconf: prefix option too short\n"));
1649 return;
1650 }
1651
1652 /*
1653 * Validation checks ([ADDRCONF], page 19)
1654 */
1655
1656 addr_type = ipv6_addr_type(&pinfo->prefix);
1657
1658 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1659 return;
1660
1661 valid_lft = ntohl(pinfo->valid);
1662 prefered_lft = ntohl(pinfo->prefered);
1663
1664 if (prefered_lft > valid_lft) {
1665 if (net_ratelimit())
1666 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1667 return;
1668 }
1669
1670 in6_dev = in6_dev_get(dev);
1671
1672 if (in6_dev == NULL) {
1673 if (net_ratelimit())
1674 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1675 return;
1676 }
1677
1678 /*
1679 * Two things going on here:
1680 * 1) Add routes for on-link prefixes
1681 * 2) Configure prefixes with the auto flag set
1682 */
1683
1684 /* Avoid arithmetic overflow. Really, we could
1685 save rt_expires in seconds, likely valid_lft,
1686 but it would require division in fib gc, that it
1687 not good.
1688 */
1689 if (valid_lft >= 0x7FFFFFFF/HZ)
1690 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1691 else
1692 rt_expires = valid_lft * HZ;
1693
1694 /*
1695 * We convert this (in jiffies) to clock_t later.
1696 * Avoid arithmetic overflow there as well.
1697 * Overflow can happen only if HZ < USER_HZ.
1698 */
1699 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1700 rt_expires = 0x7FFFFFFF / USER_HZ;
1701
1702 if (pinfo->onlink) {
1703 struct rt6_info *rt;
1704 rt = rt6_lookup(dev->nd_net, &pinfo->prefix, NULL,
1705 dev->ifindex, 1);
1706
1707 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1708 if (rt->rt6i_flags&RTF_EXPIRES) {
1709 if (valid_lft == 0) {
1710 ip6_del_rt(rt);
1711 rt = NULL;
1712 } else {
1713 rt->rt6i_expires = jiffies + rt_expires;
1714 }
1715 }
1716 } else if (valid_lft) {
1717 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1718 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1719 }
1720 if (rt)
1721 dst_release(&rt->u.dst);
1722 }
1723
1724 /* Try to figure out our local address for this prefix */
1725
1726 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1727 struct inet6_ifaddr * ifp;
1728 struct in6_addr addr;
1729 int create = 0, update_lft = 0;
1730
1731 if (pinfo->prefix_len == 64) {
1732 memcpy(&addr, &pinfo->prefix, 8);
1733 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1734 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1735 in6_dev_put(in6_dev);
1736 return;
1737 }
1738 goto ok;
1739 }
1740 if (net_ratelimit())
1741 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1742 pinfo->prefix_len);
1743 in6_dev_put(in6_dev);
1744 return;
1745
1746 ok:
1747
1748 ifp = ipv6_get_ifaddr(dev->nd_net, &addr, dev, 1);
1749
1750 if (ifp == NULL && valid_lft) {
1751 int max_addresses = in6_dev->cnf.max_addresses;
1752 u32 addr_flags = 0;
1753
1754 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1755 if (in6_dev->cnf.optimistic_dad &&
1756 !ipv6_devconf.forwarding)
1757 addr_flags = IFA_F_OPTIMISTIC;
1758 #endif
1759
1760 /* Do not allow to create too much of autoconfigured
1761 * addresses; this would be too easy way to crash kernel.
1762 */
1763 if (!max_addresses ||
1764 ipv6_count_addresses(in6_dev) < max_addresses)
1765 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1766 addr_type&IPV6_ADDR_SCOPE_MASK,
1767 addr_flags);
1768
1769 if (!ifp || IS_ERR(ifp)) {
1770 in6_dev_put(in6_dev);
1771 return;
1772 }
1773
1774 update_lft = create = 1;
1775 ifp->cstamp = jiffies;
1776 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1777 }
1778
1779 if (ifp) {
1780 int flags;
1781 unsigned long now;
1782 #ifdef CONFIG_IPV6_PRIVACY
1783 struct inet6_ifaddr *ift;
1784 #endif
1785 u32 stored_lft;
1786
1787 /* update lifetime (RFC2462 5.5.3 e) */
1788 spin_lock(&ifp->lock);
1789 now = jiffies;
1790 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1791 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1792 else
1793 stored_lft = 0;
1794 if (!update_lft && stored_lft) {
1795 if (valid_lft > MIN_VALID_LIFETIME ||
1796 valid_lft > stored_lft)
1797 update_lft = 1;
1798 else if (stored_lft <= MIN_VALID_LIFETIME) {
1799 /* valid_lft <= stored_lft is always true */
1800 /* XXX: IPsec */
1801 update_lft = 0;
1802 } else {
1803 valid_lft = MIN_VALID_LIFETIME;
1804 if (valid_lft < prefered_lft)
1805 prefered_lft = valid_lft;
1806 update_lft = 1;
1807 }
1808 }
1809
1810 if (update_lft) {
1811 ifp->valid_lft = valid_lft;
1812 ifp->prefered_lft = prefered_lft;
1813 ifp->tstamp = now;
1814 flags = ifp->flags;
1815 ifp->flags &= ~IFA_F_DEPRECATED;
1816 spin_unlock(&ifp->lock);
1817
1818 if (!(flags&IFA_F_TENTATIVE))
1819 ipv6_ifa_notify(0, ifp);
1820 } else
1821 spin_unlock(&ifp->lock);
1822
1823 #ifdef CONFIG_IPV6_PRIVACY
1824 read_lock_bh(&in6_dev->lock);
1825 /* update all temporary addresses in the list */
1826 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1827 /*
1828 * When adjusting the lifetimes of an existing
1829 * temporary address, only lower the lifetimes.
1830 * Implementations must not increase the
1831 * lifetimes of an existing temporary address
1832 * when processing a Prefix Information Option.
1833 */
1834 spin_lock(&ift->lock);
1835 flags = ift->flags;
1836 if (ift->valid_lft > valid_lft &&
1837 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1838 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1839 if (ift->prefered_lft > prefered_lft &&
1840 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1841 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1842 spin_unlock(&ift->lock);
1843 if (!(flags&IFA_F_TENTATIVE))
1844 ipv6_ifa_notify(0, ift);
1845 }
1846
1847 if (create && in6_dev->cnf.use_tempaddr > 0) {
1848 /*
1849 * When a new public address is created as described in [ADDRCONF],
1850 * also create a new temporary address.
1851 */
1852 read_unlock_bh(&in6_dev->lock);
1853 ipv6_create_tempaddr(ifp, NULL);
1854 } else {
1855 read_unlock_bh(&in6_dev->lock);
1856 }
1857 #endif
1858 in6_ifa_put(ifp);
1859 addrconf_verify(0);
1860 }
1861 }
1862 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1863 in6_dev_put(in6_dev);
1864 }
1865
1866 /*
1867 * Set destination address.
1868 * Special case for SIT interfaces where we create a new "virtual"
1869 * device.
1870 */
1871 int addrconf_set_dstaddr(struct net *net, void __user *arg)
1872 {
1873 struct in6_ifreq ireq;
1874 struct net_device *dev;
1875 int err = -EINVAL;
1876
1877 rtnl_lock();
1878
1879 err = -EFAULT;
1880 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1881 goto err_exit;
1882
1883 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1884
1885 err = -ENODEV;
1886 if (dev == NULL)
1887 goto err_exit;
1888
1889 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1890 if (dev->type == ARPHRD_SIT) {
1891 struct ifreq ifr;
1892 mm_segment_t oldfs;
1893 struct ip_tunnel_parm p;
1894
1895 err = -EADDRNOTAVAIL;
1896 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1897 goto err_exit;
1898
1899 memset(&p, 0, sizeof(p));
1900 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1901 p.iph.saddr = 0;
1902 p.iph.version = 4;
1903 p.iph.ihl = 5;
1904 p.iph.protocol = IPPROTO_IPV6;
1905 p.iph.ttl = 64;
1906 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1907
1908 oldfs = get_fs(); set_fs(KERNEL_DS);
1909 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1910 set_fs(oldfs);
1911
1912 if (err == 0) {
1913 err = -ENOBUFS;
1914 dev = __dev_get_by_name(net, p.name);
1915 if (!dev)
1916 goto err_exit;
1917 err = dev_open(dev);
1918 }
1919 }
1920 #endif
1921
1922 err_exit:
1923 rtnl_unlock();
1924 return err;
1925 }
1926
1927 /*
1928 * Manual configuration of address on an interface
1929 */
1930 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
1931 int plen, __u8 ifa_flags, __u32 prefered_lft,
1932 __u32 valid_lft)
1933 {
1934 struct inet6_ifaddr *ifp;
1935 struct inet6_dev *idev;
1936 struct net_device *dev;
1937 int scope;
1938 u32 flags = RTF_EXPIRES;
1939
1940 ASSERT_RTNL();
1941
1942 /* check the lifetime */
1943 if (!valid_lft || prefered_lft > valid_lft)
1944 return -EINVAL;
1945
1946 dev = __dev_get_by_index(net, ifindex);
1947 if (!dev)
1948 return -ENODEV;
1949
1950 if ((idev = addrconf_add_dev(dev)) == NULL)
1951 return -ENOBUFS;
1952
1953 scope = ipv6_addr_scope(pfx);
1954
1955 if (valid_lft == INFINITY_LIFE_TIME) {
1956 ifa_flags |= IFA_F_PERMANENT;
1957 flags = 0;
1958 } else if (valid_lft >= 0x7FFFFFFF/HZ)
1959 valid_lft = 0x7FFFFFFF/HZ;
1960
1961 if (prefered_lft == 0)
1962 ifa_flags |= IFA_F_DEPRECATED;
1963 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1964 (prefered_lft != INFINITY_LIFE_TIME))
1965 prefered_lft = 0x7FFFFFFF/HZ;
1966
1967 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1968
1969 if (!IS_ERR(ifp)) {
1970 spin_lock_bh(&ifp->lock);
1971 ifp->valid_lft = valid_lft;
1972 ifp->prefered_lft = prefered_lft;
1973 ifp->tstamp = jiffies;
1974 spin_unlock_bh(&ifp->lock);
1975
1976 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1977 jiffies_to_clock_t(valid_lft * HZ), flags);
1978 /*
1979 * Note that section 3.1 of RFC 4429 indicates
1980 * that the Optimistic flag should not be set for
1981 * manually configured addresses
1982 */
1983 addrconf_dad_start(ifp, 0);
1984 in6_ifa_put(ifp);
1985 addrconf_verify(0);
1986 return 0;
1987 }
1988
1989 return PTR_ERR(ifp);
1990 }
1991
1992 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
1993 int plen)
1994 {
1995 struct inet6_ifaddr *ifp;
1996 struct inet6_dev *idev;
1997 struct net_device *dev;
1998
1999 dev = __dev_get_by_index(net, ifindex);
2000 if (!dev)
2001 return -ENODEV;
2002
2003 if ((idev = __in6_dev_get(dev)) == NULL)
2004 return -ENXIO;
2005
2006 read_lock_bh(&idev->lock);
2007 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2008 if (ifp->prefix_len == plen &&
2009 ipv6_addr_equal(pfx, &ifp->addr)) {
2010 in6_ifa_hold(ifp);
2011 read_unlock_bh(&idev->lock);
2012
2013 ipv6_del_addr(ifp);
2014
2015 /* If the last address is deleted administratively,
2016 disable IPv6 on this interface.
2017 */
2018 if (idev->addr_list == NULL)
2019 addrconf_ifdown(idev->dev, 1);
2020 return 0;
2021 }
2022 }
2023 read_unlock_bh(&idev->lock);
2024 return -EADDRNOTAVAIL;
2025 }
2026
2027
2028 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2029 {
2030 struct in6_ifreq ireq;
2031 int err;
2032
2033 if (!capable(CAP_NET_ADMIN))
2034 return -EPERM;
2035
2036 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2037 return -EFAULT;
2038
2039 rtnl_lock();
2040 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2041 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2042 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2043 rtnl_unlock();
2044 return err;
2045 }
2046
2047 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2048 {
2049 struct in6_ifreq ireq;
2050 int err;
2051
2052 if (!capable(CAP_NET_ADMIN))
2053 return -EPERM;
2054
2055 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2056 return -EFAULT;
2057
2058 rtnl_lock();
2059 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2060 ireq.ifr6_prefixlen);
2061 rtnl_unlock();
2062 return err;
2063 }
2064
2065 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2066 static void sit_add_v4_addrs(struct inet6_dev *idev)
2067 {
2068 struct inet6_ifaddr * ifp;
2069 struct in6_addr addr;
2070 struct net_device *dev;
2071 struct net *net = idev->dev->nd_net;
2072 int scope;
2073
2074 ASSERT_RTNL();
2075
2076 memset(&addr, 0, sizeof(struct in6_addr));
2077 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2078
2079 if (idev->dev->flags&IFF_POINTOPOINT) {
2080 addr.s6_addr32[0] = htonl(0xfe800000);
2081 scope = IFA_LINK;
2082 } else {
2083 scope = IPV6_ADDR_COMPATv4;
2084 }
2085
2086 if (addr.s6_addr32[3]) {
2087 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2088 if (!IS_ERR(ifp)) {
2089 spin_lock_bh(&ifp->lock);
2090 ifp->flags &= ~IFA_F_TENTATIVE;
2091 spin_unlock_bh(&ifp->lock);
2092 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2093 in6_ifa_put(ifp);
2094 }
2095 return;
2096 }
2097
2098 for_each_netdev(net, dev) {
2099 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2100 if (in_dev && (dev->flags & IFF_UP)) {
2101 struct in_ifaddr * ifa;
2102
2103 int flag = scope;
2104
2105 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2106 int plen;
2107
2108 addr.s6_addr32[3] = ifa->ifa_local;
2109
2110 if (ifa->ifa_scope == RT_SCOPE_LINK)
2111 continue;
2112 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2113 if (idev->dev->flags&IFF_POINTOPOINT)
2114 continue;
2115 flag |= IFA_HOST;
2116 }
2117 if (idev->dev->flags&IFF_POINTOPOINT)
2118 plen = 64;
2119 else
2120 plen = 96;
2121
2122 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2123 IFA_F_PERMANENT);
2124 if (!IS_ERR(ifp)) {
2125 spin_lock_bh(&ifp->lock);
2126 ifp->flags &= ~IFA_F_TENTATIVE;
2127 spin_unlock_bh(&ifp->lock);
2128 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2129 in6_ifa_put(ifp);
2130 }
2131 }
2132 }
2133 }
2134 }
2135 #endif
2136
2137 static void init_loopback(struct net_device *dev)
2138 {
2139 struct inet6_dev *idev;
2140 struct inet6_ifaddr * ifp;
2141
2142 /* ::1 */
2143
2144 ASSERT_RTNL();
2145
2146 if ((idev = ipv6_find_idev(dev)) == NULL) {
2147 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2148 return;
2149 }
2150
2151 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2152 if (!IS_ERR(ifp)) {
2153 spin_lock_bh(&ifp->lock);
2154 ifp->flags &= ~IFA_F_TENTATIVE;
2155 spin_unlock_bh(&ifp->lock);
2156 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2157 in6_ifa_put(ifp);
2158 }
2159 }
2160
2161 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2162 {
2163 struct inet6_ifaddr * ifp;
2164 u32 addr_flags = IFA_F_PERMANENT;
2165
2166 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2167 if (idev->cnf.optimistic_dad &&
2168 !ipv6_devconf.forwarding)
2169 addr_flags |= IFA_F_OPTIMISTIC;
2170 #endif
2171
2172
2173 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2174 if (!IS_ERR(ifp)) {
2175 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2176 addrconf_dad_start(ifp, 0);
2177 in6_ifa_put(ifp);
2178 }
2179 }
2180
2181 static void addrconf_dev_config(struct net_device *dev)
2182 {
2183 struct in6_addr addr;
2184 struct inet6_dev * idev;
2185
2186 ASSERT_RTNL();
2187
2188 if ((dev->type != ARPHRD_ETHER) &&
2189 (dev->type != ARPHRD_FDDI) &&
2190 (dev->type != ARPHRD_IEEE802_TR) &&
2191 (dev->type != ARPHRD_ARCNET) &&
2192 (dev->type != ARPHRD_INFINIBAND)) {
2193 /* Alas, we support only Ethernet autoconfiguration. */
2194 return;
2195 }
2196
2197 idev = addrconf_add_dev(dev);
2198 if (idev == NULL)
2199 return;
2200
2201 memset(&addr, 0, sizeof(struct in6_addr));
2202 addr.s6_addr32[0] = htonl(0xFE800000);
2203
2204 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2205 addrconf_add_linklocal(idev, &addr);
2206 }
2207
2208 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2209 static void addrconf_sit_config(struct net_device *dev)
2210 {
2211 struct inet6_dev *idev;
2212
2213 ASSERT_RTNL();
2214
2215 /*
2216 * Configure the tunnel with one of our IPv4
2217 * addresses... we should configure all of
2218 * our v4 addrs in the tunnel
2219 */
2220
2221 if ((idev = ipv6_find_idev(dev)) == NULL) {
2222 printk(KERN_DEBUG "init sit: add_dev failed\n");
2223 return;
2224 }
2225
2226 if (dev->priv_flags & IFF_ISATAP) {
2227 struct in6_addr addr;
2228
2229 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2230 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2231 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2232 addrconf_add_linklocal(idev, &addr);
2233 return;
2234 }
2235
2236 sit_add_v4_addrs(idev);
2237
2238 if (dev->flags&IFF_POINTOPOINT) {
2239 addrconf_add_mroute(dev);
2240 addrconf_add_lroute(dev);
2241 } else
2242 sit_route_add(dev);
2243 }
2244 #endif
2245
2246 static inline int
2247 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2248 {
2249 struct in6_addr lladdr;
2250
2251 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2252 addrconf_add_linklocal(idev, &lladdr);
2253 return 0;
2254 }
2255 return -1;
2256 }
2257
2258 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2259 {
2260 struct net_device *link_dev;
2261 struct net *net = idev->dev->nd_net;
2262
2263 /* first try to inherit the link-local address from the link device */
2264 if (idev->dev->iflink &&
2265 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2266 if (!ipv6_inherit_linklocal(idev, link_dev))
2267 return;
2268 }
2269 /* then try to inherit it from any device */
2270 for_each_netdev(net, link_dev) {
2271 if (!ipv6_inherit_linklocal(idev, link_dev))
2272 return;
2273 }
2274 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2275 }
2276
2277 /*
2278 * Autoconfigure tunnel with a link-local address so routing protocols,
2279 * DHCPv6, MLD etc. can be run over the virtual link
2280 */
2281
2282 static void addrconf_ip6_tnl_config(struct net_device *dev)
2283 {
2284 struct inet6_dev *idev;
2285
2286 ASSERT_RTNL();
2287
2288 if ((idev = addrconf_add_dev(dev)) == NULL) {
2289 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2290 return;
2291 }
2292 ip6_tnl_add_linklocal(idev);
2293 }
2294
2295 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2296 void * data)
2297 {
2298 struct net_device *dev = (struct net_device *) data;
2299 struct inet6_dev *idev = __in6_dev_get(dev);
2300 int run_pending = 0;
2301 int err;
2302
2303 switch(event) {
2304 case NETDEV_REGISTER:
2305 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2306 idev = ipv6_add_dev(dev);
2307 if (!idev)
2308 return notifier_from_errno(-ENOMEM);
2309 }
2310 break;
2311 case NETDEV_UP:
2312 case NETDEV_CHANGE:
2313 if (dev->flags & IFF_SLAVE)
2314 break;
2315
2316 if (event == NETDEV_UP) {
2317 if (!addrconf_qdisc_ok(dev)) {
2318 /* device is not ready yet. */
2319 printk(KERN_INFO
2320 "ADDRCONF(NETDEV_UP): %s: "
2321 "link is not ready\n",
2322 dev->name);
2323 break;
2324 }
2325
2326 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2327 idev = ipv6_add_dev(dev);
2328
2329 if (idev)
2330 idev->if_flags |= IF_READY;
2331 } else {
2332 if (!addrconf_qdisc_ok(dev)) {
2333 /* device is still not ready. */
2334 break;
2335 }
2336
2337 if (idev) {
2338 if (idev->if_flags & IF_READY) {
2339 /* device is already configured. */
2340 break;
2341 }
2342 idev->if_flags |= IF_READY;
2343 }
2344
2345 printk(KERN_INFO
2346 "ADDRCONF(NETDEV_CHANGE): %s: "
2347 "link becomes ready\n",
2348 dev->name);
2349
2350 run_pending = 1;
2351 }
2352
2353 switch(dev->type) {
2354 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2355 case ARPHRD_SIT:
2356 addrconf_sit_config(dev);
2357 break;
2358 #endif
2359 case ARPHRD_TUNNEL6:
2360 addrconf_ip6_tnl_config(dev);
2361 break;
2362 case ARPHRD_LOOPBACK:
2363 init_loopback(dev);
2364 break;
2365
2366 default:
2367 addrconf_dev_config(dev);
2368 break;
2369 }
2370 if (idev) {
2371 if (run_pending)
2372 addrconf_dad_run(idev);
2373
2374 /* If the MTU changed during the interface down, when the
2375 interface up, the changed MTU must be reflected in the
2376 idev as well as routers.
2377 */
2378 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2379 rt6_mtu_change(dev, dev->mtu);
2380 idev->cnf.mtu6 = dev->mtu;
2381 }
2382 idev->tstamp = jiffies;
2383 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2384 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2385 stop IPv6 on this interface.
2386 */
2387 if (dev->mtu < IPV6_MIN_MTU)
2388 addrconf_ifdown(dev, event != NETDEV_DOWN);
2389 }
2390 break;
2391
2392 case NETDEV_CHANGEMTU:
2393 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2394 rt6_mtu_change(dev, dev->mtu);
2395 idev->cnf.mtu6 = dev->mtu;
2396 break;
2397 }
2398
2399 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2400 idev = ipv6_add_dev(dev);
2401 if (idev)
2402 break;
2403 }
2404
2405 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2406
2407 case NETDEV_DOWN:
2408 case NETDEV_UNREGISTER:
2409 /*
2410 * Remove all addresses from this interface.
2411 */
2412 addrconf_ifdown(dev, event != NETDEV_DOWN);
2413 break;
2414
2415 case NETDEV_CHANGENAME:
2416 if (idev) {
2417 snmp6_unregister_dev(idev);
2418 addrconf_sysctl_unregister(idev);
2419 addrconf_sysctl_register(idev);
2420 err = snmp6_register_dev(idev);
2421 if (err)
2422 return notifier_from_errno(err);
2423 }
2424 break;
2425 }
2426
2427 return NOTIFY_OK;
2428 }
2429
2430 /*
2431 * addrconf module should be notified of a device going up
2432 */
2433 static struct notifier_block ipv6_dev_notf = {
2434 .notifier_call = addrconf_notify,
2435 .priority = 0
2436 };
2437
2438 static int addrconf_ifdown(struct net_device *dev, int how)
2439 {
2440 struct inet6_dev *idev;
2441 struct inet6_ifaddr *ifa, **bifa;
2442 struct net *net = dev->nd_net;
2443 int i;
2444
2445 ASSERT_RTNL();
2446
2447 if (dev == init_net.loopback_dev && how == 1)
2448 how = 0;
2449
2450 rt6_ifdown(net, dev);
2451 neigh_ifdown(&nd_tbl, dev);
2452
2453 idev = __in6_dev_get(dev);
2454 if (idev == NULL)
2455 return -ENODEV;
2456
2457 /* Step 1: remove reference to ipv6 device from parent device.
2458 Do not dev_put!
2459 */
2460 if (how == 1) {
2461 idev->dead = 1;
2462
2463 /* protected by rtnl_lock */
2464 rcu_assign_pointer(dev->ip6_ptr, NULL);
2465
2466 /* Step 1.5: remove snmp6 entry */
2467 snmp6_unregister_dev(idev);
2468
2469 }
2470
2471 /* Step 2: clear hash table */
2472 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2473 bifa = &inet6_addr_lst[i];
2474
2475 write_lock_bh(&addrconf_hash_lock);
2476 while ((ifa = *bifa) != NULL) {
2477 if (ifa->idev == idev) {
2478 *bifa = ifa->lst_next;
2479 ifa->lst_next = NULL;
2480 addrconf_del_timer(ifa);
2481 in6_ifa_put(ifa);
2482 continue;
2483 }
2484 bifa = &ifa->lst_next;
2485 }
2486 write_unlock_bh(&addrconf_hash_lock);
2487 }
2488
2489 write_lock_bh(&idev->lock);
2490
2491 /* Step 3: clear flags for stateless addrconf */
2492 if (how != 1)
2493 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2494
2495 /* Step 4: clear address list */
2496 #ifdef CONFIG_IPV6_PRIVACY
2497 if (how == 1 && del_timer(&idev->regen_timer))
2498 in6_dev_put(idev);
2499
2500 /* clear tempaddr list */
2501 while ((ifa = idev->tempaddr_list) != NULL) {
2502 idev->tempaddr_list = ifa->tmp_next;
2503 ifa->tmp_next = NULL;
2504 ifa->dead = 1;
2505 write_unlock_bh(&idev->lock);
2506 spin_lock_bh(&ifa->lock);
2507
2508 if (ifa->ifpub) {
2509 in6_ifa_put(ifa->ifpub);
2510 ifa->ifpub = NULL;
2511 }
2512 spin_unlock_bh(&ifa->lock);
2513 in6_ifa_put(ifa);
2514 write_lock_bh(&idev->lock);
2515 }
2516 #endif
2517 while ((ifa = idev->addr_list) != NULL) {
2518 idev->addr_list = ifa->if_next;
2519 ifa->if_next = NULL;
2520 ifa->dead = 1;
2521 addrconf_del_timer(ifa);
2522 write_unlock_bh(&idev->lock);
2523
2524 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2525 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2526 in6_ifa_put(ifa);
2527
2528 write_lock_bh(&idev->lock);
2529 }
2530 write_unlock_bh(&idev->lock);
2531
2532 /* Step 5: Discard multicast list */
2533
2534 if (how == 1)
2535 ipv6_mc_destroy_dev(idev);
2536 else
2537 ipv6_mc_down(idev);
2538
2539 idev->tstamp = jiffies;
2540
2541 /* Shot the device (if unregistered) */
2542
2543 if (how == 1) {
2544 addrconf_sysctl_unregister(idev);
2545 neigh_parms_release(&nd_tbl, idev->nd_parms);
2546 neigh_ifdown(&nd_tbl, dev);
2547 in6_dev_put(idev);
2548 }
2549 return 0;
2550 }
2551
2552 static void addrconf_rs_timer(unsigned long data)
2553 {
2554 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2555
2556 if (ifp->idev->cnf.forwarding)
2557 goto out;
2558
2559 if (ifp->idev->if_flags & IF_RA_RCVD) {
2560 /*
2561 * Announcement received after solicitation
2562 * was sent
2563 */
2564 goto out;
2565 }
2566
2567 spin_lock(&ifp->lock);
2568 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2569 struct in6_addr all_routers;
2570
2571 /* The wait after the last probe can be shorter */
2572 addrconf_mod_timer(ifp, AC_RS,
2573 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2574 ifp->idev->cnf.rtr_solicit_delay :
2575 ifp->idev->cnf.rtr_solicit_interval);
2576 spin_unlock(&ifp->lock);
2577
2578 ipv6_addr_all_routers(&all_routers);
2579
2580 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2581 } else {
2582 spin_unlock(&ifp->lock);
2583 /*
2584 * Note: we do not support deprecated "all on-link"
2585 * assumption any longer.
2586 */
2587 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2588 ifp->idev->dev->name);
2589 }
2590
2591 out:
2592 in6_ifa_put(ifp);
2593 }
2594
2595 /*
2596 * Duplicate Address Detection
2597 */
2598 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2599 {
2600 unsigned long rand_num;
2601 struct inet6_dev *idev = ifp->idev;
2602
2603 if (ifp->flags & IFA_F_OPTIMISTIC)
2604 rand_num = 0;
2605 else
2606 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2607
2608 ifp->probes = idev->cnf.dad_transmits;
2609 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2610 }
2611
2612 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2613 {
2614 struct inet6_dev *idev = ifp->idev;
2615 struct net_device *dev = idev->dev;
2616
2617 addrconf_join_solict(dev, &ifp->addr);
2618
2619 net_srandom(ifp->addr.s6_addr32[3]);
2620
2621 read_lock_bh(&idev->lock);
2622 if (ifp->dead)
2623 goto out;
2624 spin_lock_bh(&ifp->lock);
2625
2626 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2627 !(ifp->flags&IFA_F_TENTATIVE) ||
2628 ifp->flags & IFA_F_NODAD) {
2629 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2630 spin_unlock_bh(&ifp->lock);
2631 read_unlock_bh(&idev->lock);
2632
2633 addrconf_dad_completed(ifp);
2634 return;
2635 }
2636
2637 if (!(idev->if_flags & IF_READY)) {
2638 spin_unlock_bh(&ifp->lock);
2639 read_unlock_bh(&idev->lock);
2640 /*
2641 * If the defice is not ready:
2642 * - keep it tentative if it is a permanent address.
2643 * - otherwise, kill it.
2644 */
2645 in6_ifa_hold(ifp);
2646 addrconf_dad_stop(ifp);
2647 return;
2648 }
2649
2650 /*
2651 * Optimistic nodes can start receiving
2652 * Frames right away
2653 */
2654 if(ifp->flags & IFA_F_OPTIMISTIC)
2655 ip6_ins_rt(ifp->rt);
2656
2657 addrconf_dad_kick(ifp);
2658 spin_unlock_bh(&ifp->lock);
2659 out:
2660 read_unlock_bh(&idev->lock);
2661 }
2662
2663 static void addrconf_dad_timer(unsigned long data)
2664 {
2665 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2666 struct inet6_dev *idev = ifp->idev;
2667 struct in6_addr unspec;
2668 struct in6_addr mcaddr;
2669
2670 read_lock_bh(&idev->lock);
2671 if (idev->dead) {
2672 read_unlock_bh(&idev->lock);
2673 goto out;
2674 }
2675 spin_lock_bh(&ifp->lock);
2676 if (ifp->probes == 0) {
2677 /*
2678 * DAD was successful
2679 */
2680
2681 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2682 spin_unlock_bh(&ifp->lock);
2683 read_unlock_bh(&idev->lock);
2684
2685 addrconf_dad_completed(ifp);
2686
2687 goto out;
2688 }
2689
2690 ifp->probes--;
2691 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2692 spin_unlock_bh(&ifp->lock);
2693 read_unlock_bh(&idev->lock);
2694
2695 /* send a neighbour solicitation for our addr */
2696 memset(&unspec, 0, sizeof(unspec));
2697 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2698 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2699 out:
2700 in6_ifa_put(ifp);
2701 }
2702
2703 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2704 {
2705 struct net_device * dev = ifp->idev->dev;
2706
2707 /*
2708 * Configure the address for reception. Now it is valid.
2709 */
2710
2711 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2712
2713 /* If added prefix is link local and forwarding is off,
2714 start sending router solicitations.
2715 */
2716
2717 if (ifp->idev->cnf.forwarding == 0 &&
2718 ifp->idev->cnf.rtr_solicits > 0 &&
2719 (dev->flags&IFF_LOOPBACK) == 0 &&
2720 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2721 struct in6_addr all_routers;
2722
2723 ipv6_addr_all_routers(&all_routers);
2724
2725 /*
2726 * If a host as already performed a random delay
2727 * [...] as part of DAD [...] there is no need
2728 * to delay again before sending the first RS
2729 */
2730 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2731
2732 spin_lock_bh(&ifp->lock);
2733 ifp->probes = 1;
2734 ifp->idev->if_flags |= IF_RS_SENT;
2735 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2736 spin_unlock_bh(&ifp->lock);
2737 }
2738 }
2739
2740 static void addrconf_dad_run(struct inet6_dev *idev) {
2741 struct inet6_ifaddr *ifp;
2742
2743 read_lock_bh(&idev->lock);
2744 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2745 spin_lock_bh(&ifp->lock);
2746 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2747 spin_unlock_bh(&ifp->lock);
2748 continue;
2749 }
2750 spin_unlock_bh(&ifp->lock);
2751 addrconf_dad_kick(ifp);
2752 }
2753 read_unlock_bh(&idev->lock);
2754 }
2755
2756 #ifdef CONFIG_PROC_FS
2757 struct if6_iter_state {
2758 struct seq_net_private p;
2759 int bucket;
2760 };
2761
2762 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2763 {
2764 struct inet6_ifaddr *ifa = NULL;
2765 struct if6_iter_state *state = seq->private;
2766 struct net *net = state->p.net;
2767
2768 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2769 ifa = inet6_addr_lst[state->bucket];
2770
2771 while (ifa && ifa->idev->dev->nd_net != net)
2772 ifa = ifa->lst_next;
2773 if (ifa)
2774 break;
2775 }
2776 return ifa;
2777 }
2778
2779 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2780 {
2781 struct if6_iter_state *state = seq->private;
2782 struct net *net = state->p.net;
2783
2784 ifa = ifa->lst_next;
2785 try_again:
2786 if (ifa) {
2787 if (ifa->idev->dev->nd_net != net) {
2788 ifa = ifa->lst_next;
2789 goto try_again;
2790 }
2791 }
2792
2793 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2794 ifa = inet6_addr_lst[state->bucket];
2795 goto try_again;
2796 }
2797
2798 return ifa;
2799 }
2800
2801 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2802 {
2803 struct inet6_ifaddr *ifa = if6_get_first(seq);
2804
2805 if (ifa)
2806 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2807 --pos;
2808 return pos ? NULL : ifa;
2809 }
2810
2811 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2812 __acquires(addrconf_hash_lock)
2813 {
2814 read_lock_bh(&addrconf_hash_lock);
2815 return if6_get_idx(seq, *pos);
2816 }
2817
2818 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2819 {
2820 struct inet6_ifaddr *ifa;
2821
2822 ifa = if6_get_next(seq, v);
2823 ++*pos;
2824 return ifa;
2825 }
2826
2827 static void if6_seq_stop(struct seq_file *seq, void *v)
2828 __releases(addrconf_hash_lock)
2829 {
2830 read_unlock_bh(&addrconf_hash_lock);
2831 }
2832
2833 static int if6_seq_show(struct seq_file *seq, void *v)
2834 {
2835 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2836 seq_printf(seq,
2837 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2838 NIP6(ifp->addr),
2839 ifp->idev->dev->ifindex,
2840 ifp->prefix_len,
2841 ifp->scope,
2842 ifp->flags,
2843 ifp->idev->dev->name);
2844 return 0;
2845 }
2846
2847 static const struct seq_operations if6_seq_ops = {
2848 .start = if6_seq_start,
2849 .next = if6_seq_next,
2850 .show = if6_seq_show,
2851 .stop = if6_seq_stop,
2852 };
2853
2854 static int if6_seq_open(struct inode *inode, struct file *file)
2855 {
2856 return seq_open_net(inode, file, &if6_seq_ops,
2857 sizeof(struct if6_iter_state));
2858 }
2859
2860 static const struct file_operations if6_fops = {
2861 .owner = THIS_MODULE,
2862 .open = if6_seq_open,
2863 .read = seq_read,
2864 .llseek = seq_lseek,
2865 .release = seq_release_net,
2866 };
2867
2868 static int if6_proc_net_init(struct net *net)
2869 {
2870 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2871 return -ENOMEM;
2872 return 0;
2873 }
2874
2875 static void if6_proc_net_exit(struct net *net)
2876 {
2877 proc_net_remove(net, "if_inet6");
2878 }
2879
2880 static struct pernet_operations if6_proc_net_ops = {
2881 .init = if6_proc_net_init,
2882 .exit = if6_proc_net_exit,
2883 };
2884
2885 int __init if6_proc_init(void)
2886 {
2887 return register_pernet_subsys(&if6_proc_net_ops);
2888 }
2889
2890 void if6_proc_exit(void)
2891 {
2892 unregister_pernet_subsys(&if6_proc_net_ops);
2893 }
2894 #endif /* CONFIG_PROC_FS */
2895
2896 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2897 /* Check if address is a home address configured on any interface. */
2898 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2899 {
2900 int ret = 0;
2901 struct inet6_ifaddr * ifp;
2902 u8 hash = ipv6_addr_hash(addr);
2903 read_lock_bh(&addrconf_hash_lock);
2904 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2905 if (ifp->idev->dev->nd_net != net)
2906 continue;
2907 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2908 (ifp->flags & IFA_F_HOMEADDRESS)) {
2909 ret = 1;
2910 break;
2911 }
2912 }
2913 read_unlock_bh(&addrconf_hash_lock);
2914 return ret;
2915 }
2916 #endif
2917
2918 /*
2919 * Periodic address status verification
2920 */
2921
2922 static void addrconf_verify(unsigned long foo)
2923 {
2924 struct inet6_ifaddr *ifp;
2925 unsigned long now, next;
2926 int i;
2927
2928 spin_lock_bh(&addrconf_verify_lock);
2929 now = jiffies;
2930 next = now + ADDR_CHECK_FREQUENCY;
2931
2932 del_timer(&addr_chk_timer);
2933
2934 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2935
2936 restart:
2937 read_lock(&addrconf_hash_lock);
2938 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2939 unsigned long age;
2940 #ifdef CONFIG_IPV6_PRIVACY
2941 unsigned long regen_advance;
2942 #endif
2943
2944 if (ifp->flags & IFA_F_PERMANENT)
2945 continue;
2946
2947 spin_lock(&ifp->lock);
2948 age = (now - ifp->tstamp) / HZ;
2949
2950 #ifdef CONFIG_IPV6_PRIVACY
2951 regen_advance = ifp->idev->cnf.regen_max_retry *
2952 ifp->idev->cnf.dad_transmits *
2953 ifp->idev->nd_parms->retrans_time / HZ;
2954 #endif
2955
2956 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2957 age >= ifp->valid_lft) {
2958 spin_unlock(&ifp->lock);
2959 in6_ifa_hold(ifp);
2960 read_unlock(&addrconf_hash_lock);
2961 ipv6_del_addr(ifp);
2962 goto restart;
2963 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2964 spin_unlock(&ifp->lock);
2965 continue;
2966 } else if (age >= ifp->prefered_lft) {
2967 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2968 int deprecate = 0;
2969
2970 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2971 deprecate = 1;
2972 ifp->flags |= IFA_F_DEPRECATED;
2973 }
2974
2975 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2976 next = ifp->tstamp + ifp->valid_lft * HZ;
2977
2978 spin_unlock(&ifp->lock);
2979
2980 if (deprecate) {
2981 in6_ifa_hold(ifp);
2982 read_unlock(&addrconf_hash_lock);
2983
2984 ipv6_ifa_notify(0, ifp);
2985 in6_ifa_put(ifp);
2986 goto restart;
2987 }
2988 #ifdef CONFIG_IPV6_PRIVACY
2989 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2990 !(ifp->flags&IFA_F_TENTATIVE)) {
2991 if (age >= ifp->prefered_lft - regen_advance) {
2992 struct inet6_ifaddr *ifpub = ifp->ifpub;
2993 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2994 next = ifp->tstamp + ifp->prefered_lft * HZ;
2995 if (!ifp->regen_count && ifpub) {
2996 ifp->regen_count++;
2997 in6_ifa_hold(ifp);
2998 in6_ifa_hold(ifpub);
2999 spin_unlock(&ifp->lock);
3000 read_unlock(&addrconf_hash_lock);
3001 spin_lock(&ifpub->lock);
3002 ifpub->regen_count = 0;
3003 spin_unlock(&ifpub->lock);
3004 ipv6_create_tempaddr(ifpub, ifp);
3005 in6_ifa_put(ifpub);
3006 in6_ifa_put(ifp);
3007 goto restart;
3008 }
3009 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3010 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3011 spin_unlock(&ifp->lock);
3012 #endif
3013 } else {
3014 /* ifp->prefered_lft <= ifp->valid_lft */
3015 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3016 next = ifp->tstamp + ifp->prefered_lft * HZ;
3017 spin_unlock(&ifp->lock);
3018 }
3019 }
3020 read_unlock(&addrconf_hash_lock);
3021 }
3022
3023 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3024 add_timer(&addr_chk_timer);
3025 spin_unlock_bh(&addrconf_verify_lock);
3026 }
3027
3028 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3029 {
3030 struct in6_addr *pfx = NULL;
3031
3032 if (addr)
3033 pfx = nla_data(addr);
3034
3035 if (local) {
3036 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3037 pfx = NULL;
3038 else
3039 pfx = nla_data(local);
3040 }
3041
3042 return pfx;
3043 }
3044
3045 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3046 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3047 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3048 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3049 };
3050
3051 static int
3052 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3053 {
3054 struct net *net = skb->sk->sk_net;
3055 struct ifaddrmsg *ifm;
3056 struct nlattr *tb[IFA_MAX+1];
3057 struct in6_addr *pfx;
3058 int err;
3059
3060 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3061 if (err < 0)
3062 return err;
3063
3064 ifm = nlmsg_data(nlh);
3065 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3066 if (pfx == NULL)
3067 return -EINVAL;
3068
3069 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3070 }
3071
3072 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3073 u32 prefered_lft, u32 valid_lft)
3074 {
3075 u32 flags = RTF_EXPIRES;
3076
3077 if (!valid_lft || (prefered_lft > valid_lft))
3078 return -EINVAL;
3079
3080 if (valid_lft == INFINITY_LIFE_TIME) {
3081 ifa_flags |= IFA_F_PERMANENT;
3082 flags = 0;
3083 } else if (valid_lft >= 0x7FFFFFFF/HZ)
3084 valid_lft = 0x7FFFFFFF/HZ;
3085
3086 if (prefered_lft == 0)
3087 ifa_flags |= IFA_F_DEPRECATED;
3088 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3089 (prefered_lft != INFINITY_LIFE_TIME))
3090 prefered_lft = 0x7FFFFFFF/HZ;
3091
3092 spin_lock_bh(&ifp->lock);
3093 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3094 ifp->tstamp = jiffies;
3095 ifp->valid_lft = valid_lft;
3096 ifp->prefered_lft = prefered_lft;
3097
3098 spin_unlock_bh(&ifp->lock);
3099 if (!(ifp->flags&IFA_F_TENTATIVE))
3100 ipv6_ifa_notify(0, ifp);
3101
3102 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3103 jiffies_to_clock_t(valid_lft * HZ), flags);
3104 addrconf_verify(0);
3105
3106 return 0;
3107 }
3108
3109 static int
3110 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3111 {
3112 struct net *net = skb->sk->sk_net;
3113 struct ifaddrmsg *ifm;
3114 struct nlattr *tb[IFA_MAX+1];
3115 struct in6_addr *pfx;
3116 struct inet6_ifaddr *ifa;
3117 struct net_device *dev;
3118 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3119 u8 ifa_flags;
3120 int err;
3121
3122 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3123 if (err < 0)
3124 return err;
3125
3126 ifm = nlmsg_data(nlh);
3127 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3128 if (pfx == NULL)
3129 return -EINVAL;
3130
3131 if (tb[IFA_CACHEINFO]) {
3132 struct ifa_cacheinfo *ci;
3133
3134 ci = nla_data(tb[IFA_CACHEINFO]);
3135 valid_lft = ci->ifa_valid;
3136 preferred_lft = ci->ifa_prefered;
3137 } else {
3138 preferred_lft = INFINITY_LIFE_TIME;
3139 valid_lft = INFINITY_LIFE_TIME;
3140 }
3141
3142 dev = __dev_get_by_index(net, ifm->ifa_index);
3143 if (dev == NULL)
3144 return -ENODEV;
3145
3146 /* We ignore other flags so far. */
3147 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3148
3149 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3150 if (ifa == NULL) {
3151 /*
3152 * It would be best to check for !NLM_F_CREATE here but
3153 * userspace alreay relies on not having to provide this.
3154 */
3155 return inet6_addr_add(net, ifm->ifa_index, pfx,
3156 ifm->ifa_prefixlen, ifa_flags,
3157 preferred_lft, valid_lft);
3158 }
3159
3160 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3161 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3162 err = -EEXIST;
3163 else
3164 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3165
3166 in6_ifa_put(ifa);
3167
3168 return err;
3169 }
3170
3171 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3172 u8 scope, int ifindex)
3173 {
3174 struct ifaddrmsg *ifm;
3175
3176 ifm = nlmsg_data(nlh);
3177 ifm->ifa_family = AF_INET6;
3178 ifm->ifa_prefixlen = prefixlen;
3179 ifm->ifa_flags = flags;
3180 ifm->ifa_scope = scope;
3181 ifm->ifa_index = ifindex;
3182 }
3183
3184 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3185 unsigned long tstamp, u32 preferred, u32 valid)
3186 {
3187 struct ifa_cacheinfo ci;
3188
3189 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3190 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3191 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3192 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3193 ci.ifa_prefered = preferred;
3194 ci.ifa_valid = valid;
3195
3196 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3197 }
3198
3199 static inline int rt_scope(int ifa_scope)
3200 {
3201 if (ifa_scope & IFA_HOST)
3202 return RT_SCOPE_HOST;
3203 else if (ifa_scope & IFA_LINK)
3204 return RT_SCOPE_LINK;
3205 else if (ifa_scope & IFA_SITE)
3206 return RT_SCOPE_SITE;
3207 else
3208 return RT_SCOPE_UNIVERSE;
3209 }
3210
3211 static inline int inet6_ifaddr_msgsize(void)
3212 {
3213 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3214 + nla_total_size(16) /* IFA_ADDRESS */
3215 + nla_total_size(sizeof(struct ifa_cacheinfo));
3216 }
3217
3218 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3219 u32 pid, u32 seq, int event, unsigned int flags)
3220 {
3221 struct nlmsghdr *nlh;
3222 u32 preferred, valid;
3223
3224 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3225 if (nlh == NULL)
3226 return -EMSGSIZE;
3227
3228 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3229 ifa->idev->dev->ifindex);
3230
3231 if (!(ifa->flags&IFA_F_PERMANENT)) {
3232 preferred = ifa->prefered_lft;
3233 valid = ifa->valid_lft;
3234 if (preferred != INFINITY_LIFE_TIME) {
3235 long tval = (jiffies - ifa->tstamp)/HZ;
3236 preferred -= tval;
3237 if (valid != INFINITY_LIFE_TIME)
3238 valid -= tval;
3239 }
3240 } else {
3241 preferred = INFINITY_LIFE_TIME;
3242 valid = INFINITY_LIFE_TIME;
3243 }
3244
3245 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3246 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3247 nlmsg_cancel(skb, nlh);
3248 return -EMSGSIZE;
3249 }
3250
3251 return nlmsg_end(skb, nlh);
3252 }
3253
3254 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3255 u32 pid, u32 seq, int event, u16 flags)
3256 {
3257 struct nlmsghdr *nlh;
3258 u8 scope = RT_SCOPE_UNIVERSE;
3259 int ifindex = ifmca->idev->dev->ifindex;
3260
3261 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3262 scope = RT_SCOPE_SITE;
3263
3264 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3265 if (nlh == NULL)
3266 return -EMSGSIZE;
3267
3268 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3269 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3270 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3271 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3272 nlmsg_cancel(skb, nlh);
3273 return -EMSGSIZE;
3274 }
3275
3276 return nlmsg_end(skb, nlh);
3277 }
3278
3279 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3280 u32 pid, u32 seq, int event, unsigned int flags)
3281 {
3282 struct nlmsghdr *nlh;
3283 u8 scope = RT_SCOPE_UNIVERSE;
3284 int ifindex = ifaca->aca_idev->dev->ifindex;
3285
3286 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3287 scope = RT_SCOPE_SITE;
3288
3289 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3290 if (nlh == NULL)
3291 return -EMSGSIZE;
3292
3293 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3294 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3295 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3296 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3297 nlmsg_cancel(skb, nlh);
3298 return -EMSGSIZE;
3299 }
3300
3301 return nlmsg_end(skb, nlh);
3302 }
3303
3304 enum addr_type_t
3305 {
3306 UNICAST_ADDR,
3307 MULTICAST_ADDR,
3308 ANYCAST_ADDR,
3309 };
3310
3311 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3312 enum addr_type_t type)
3313 {
3314 int idx, ip_idx;
3315 int s_idx, s_ip_idx;
3316 int err = 1;
3317 struct net_device *dev;
3318 struct inet6_dev *idev = NULL;
3319 struct inet6_ifaddr *ifa;
3320 struct ifmcaddr6 *ifmca;
3321 struct ifacaddr6 *ifaca;
3322 struct net *net = skb->sk->sk_net;
3323
3324 s_idx = cb->args[0];
3325 s_ip_idx = ip_idx = cb->args[1];
3326
3327 idx = 0;
3328 for_each_netdev(net, dev) {
3329 if (idx < s_idx)
3330 goto cont;
3331 if (idx > s_idx)
3332 s_ip_idx = 0;
3333 ip_idx = 0;
3334 if ((idev = in6_dev_get(dev)) == NULL)
3335 goto cont;
3336 read_lock_bh(&idev->lock);
3337 switch (type) {
3338 case UNICAST_ADDR:
3339 /* unicast address incl. temp addr */
3340 for (ifa = idev->addr_list; ifa;
3341 ifa = ifa->if_next, ip_idx++) {
3342 if (ip_idx < s_ip_idx)
3343 continue;
3344 err = inet6_fill_ifaddr(skb, ifa,
3345 NETLINK_CB(cb->skb).pid,
3346 cb->nlh->nlmsg_seq,
3347 RTM_NEWADDR,
3348 NLM_F_MULTI);
3349 }
3350 break;
3351 case MULTICAST_ADDR:
3352 /* multicast address */
3353 for (ifmca = idev->mc_list; ifmca;
3354 ifmca = ifmca->next, ip_idx++) {
3355 if (ip_idx < s_ip_idx)
3356 continue;
3357 err = inet6_fill_ifmcaddr(skb, ifmca,
3358 NETLINK_CB(cb->skb).pid,
3359 cb->nlh->nlmsg_seq,
3360 RTM_GETMULTICAST,
3361 NLM_F_MULTI);
3362 }
3363 break;
3364 case ANYCAST_ADDR:
3365 /* anycast address */
3366 for (ifaca = idev->ac_list; ifaca;
3367 ifaca = ifaca->aca_next, ip_idx++) {
3368 if (ip_idx < s_ip_idx)
3369 continue;
3370 err = inet6_fill_ifacaddr(skb, ifaca,
3371 NETLINK_CB(cb->skb).pid,
3372 cb->nlh->nlmsg_seq,
3373 RTM_GETANYCAST,
3374 NLM_F_MULTI);
3375 }
3376 break;
3377 default:
3378 break;
3379 }
3380 read_unlock_bh(&idev->lock);
3381 in6_dev_put(idev);
3382
3383 if (err <= 0)
3384 break;
3385 cont:
3386 idx++;
3387 }
3388 cb->args[0] = idx;
3389 cb->args[1] = ip_idx;
3390 return skb->len;
3391 }
3392
3393 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3394 {
3395 enum addr_type_t type = UNICAST_ADDR;
3396
3397 return inet6_dump_addr(skb, cb, type);
3398 }
3399
3400 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3401 {
3402 enum addr_type_t type = MULTICAST_ADDR;
3403
3404 return inet6_dump_addr(skb, cb, type);
3405 }
3406
3407
3408 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3409 {
3410 enum addr_type_t type = ANYCAST_ADDR;
3411
3412 return inet6_dump_addr(skb, cb, type);
3413 }
3414
3415 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3416 void *arg)
3417 {
3418 struct net *net = in_skb->sk->sk_net;
3419 struct ifaddrmsg *ifm;
3420 struct nlattr *tb[IFA_MAX+1];
3421 struct in6_addr *addr = NULL;
3422 struct net_device *dev = NULL;
3423 struct inet6_ifaddr *ifa;
3424 struct sk_buff *skb;
3425 int err;
3426
3427 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3428 if (err < 0)
3429 goto errout;
3430
3431 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3432 if (addr == NULL) {
3433 err = -EINVAL;
3434 goto errout;
3435 }
3436
3437 ifm = nlmsg_data(nlh);
3438 if (ifm->ifa_index)
3439 dev = __dev_get_by_index(net, ifm->ifa_index);
3440
3441 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3442 err = -EADDRNOTAVAIL;
3443 goto errout;
3444 }
3445
3446 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3447 err = -ENOBUFS;
3448 goto errout_ifa;
3449 }
3450
3451 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3452 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3453 if (err < 0) {
3454 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3455 WARN_ON(err == -EMSGSIZE);
3456 kfree_skb(skb);
3457 goto errout_ifa;
3458 }
3459 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3460 errout_ifa:
3461 in6_ifa_put(ifa);
3462 errout:
3463 return err;
3464 }
3465
3466 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3467 {
3468 struct sk_buff *skb;
3469 struct net *net = ifa->idev->dev->nd_net;
3470 int err = -ENOBUFS;
3471
3472 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3473 if (skb == NULL)
3474 goto errout;
3475
3476 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3477 if (err < 0) {
3478 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3479 WARN_ON(err == -EMSGSIZE);
3480 kfree_skb(skb);
3481 goto errout;
3482 }
3483 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3484 errout:
3485 if (err < 0)
3486 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3487 }
3488
3489 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3490 __s32 *array, int bytes)
3491 {
3492 BUG_ON(bytes < (DEVCONF_MAX * 4));
3493
3494 memset(array, 0, bytes);
3495 array[DEVCONF_FORWARDING] = cnf->forwarding;
3496 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3497 array[DEVCONF_MTU6] = cnf->mtu6;
3498 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3499 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3500 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3501 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3502 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3503 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3504 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3505 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3506 #ifdef CONFIG_IPV6_PRIVACY
3507 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3508 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3509 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3510 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3511 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3512 #endif
3513 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3514 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3515 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3516 #ifdef CONFIG_IPV6_ROUTER_PREF
3517 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3518 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3519 #ifdef CONFIG_IPV6_ROUTE_INFO
3520 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3521 #endif
3522 #endif
3523 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3524 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3525 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3526 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3527 #endif
3528 }
3529
3530 static inline size_t inet6_if_nlmsg_size(void)
3531 {
3532 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3533 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3534 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3535 + nla_total_size(4) /* IFLA_MTU */
3536 + nla_total_size(4) /* IFLA_LINK */
3537 + nla_total_size( /* IFLA_PROTINFO */
3538 nla_total_size(4) /* IFLA_INET6_FLAGS */
3539 + nla_total_size(sizeof(struct ifla_cacheinfo))
3540 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3541 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3542 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3543 );
3544 }
3545
3546 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3547 int bytes)
3548 {
3549 int i;
3550 int pad = bytes - sizeof(u64) * items;
3551 BUG_ON(pad < 0);
3552
3553 /* Use put_unaligned() because stats may not be aligned for u64. */
3554 put_unaligned(items, &stats[0]);
3555 for (i = 1; i < items; i++)
3556 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3557
3558 memset(&stats[items], 0, pad);
3559 }
3560
3561 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3562 int bytes)
3563 {
3564 switch(attrtype) {
3565 case IFLA_INET6_STATS:
3566 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3567 break;
3568 case IFLA_INET6_ICMP6STATS:
3569 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3570 break;
3571 }
3572 }
3573
3574 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3575 u32 pid, u32 seq, int event, unsigned int flags)
3576 {
3577 struct net_device *dev = idev->dev;
3578 struct nlattr *nla;
3579 struct ifinfomsg *hdr;
3580 struct nlmsghdr *nlh;
3581 void *protoinfo;
3582 struct ifla_cacheinfo ci;
3583
3584 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3585 if (nlh == NULL)
3586 return -EMSGSIZE;
3587
3588 hdr = nlmsg_data(nlh);
3589 hdr->ifi_family = AF_INET6;
3590 hdr->__ifi_pad = 0;
3591 hdr->ifi_type = dev->type;
3592 hdr->ifi_index = dev->ifindex;
3593 hdr->ifi_flags = dev_get_flags(dev);
3594 hdr->ifi_change = 0;
3595
3596 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3597
3598 if (dev->addr_len)
3599 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3600
3601 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3602 if (dev->ifindex != dev->iflink)
3603 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3604
3605 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3606 if (protoinfo == NULL)
3607 goto nla_put_failure;
3608
3609 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3610
3611 ci.max_reasm_len = IPV6_MAXPLEN;
3612 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3613 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3614 ci.reachable_time = idev->nd_parms->reachable_time;
3615 ci.retrans_time = idev->nd_parms->retrans_time;
3616 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3617
3618 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3619 if (nla == NULL)
3620 goto nla_put_failure;
3621 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3622
3623 /* XXX - MC not implemented */
3624
3625 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3626 if (nla == NULL)
3627 goto nla_put_failure;
3628 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3629
3630 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3631 if (nla == NULL)
3632 goto nla_put_failure;
3633 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3634
3635 nla_nest_end(skb, protoinfo);
3636 return nlmsg_end(skb, nlh);
3637
3638 nla_put_failure:
3639 nlmsg_cancel(skb, nlh);
3640 return -EMSGSIZE;
3641 }
3642
3643 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3644 {
3645 struct net *net = skb->sk->sk_net;
3646 int idx, err;
3647 int s_idx = cb->args[0];
3648 struct net_device *dev;
3649 struct inet6_dev *idev;
3650
3651 read_lock(&dev_base_lock);
3652 idx = 0;
3653 for_each_netdev(net, dev) {
3654 if (idx < s_idx)
3655 goto cont;
3656 if ((idev = in6_dev_get(dev)) == NULL)
3657 goto cont;
3658 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3659 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3660 in6_dev_put(idev);
3661 if (err <= 0)
3662 break;
3663 cont:
3664 idx++;
3665 }
3666 read_unlock(&dev_base_lock);
3667 cb->args[0] = idx;
3668
3669 return skb->len;
3670 }
3671
3672 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3673 {
3674 struct sk_buff *skb;
3675 struct net *net = idev->dev->nd_net;
3676 int err = -ENOBUFS;
3677
3678 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3679 if (skb == NULL)
3680 goto errout;
3681
3682 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3683 if (err < 0) {
3684 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3685 WARN_ON(err == -EMSGSIZE);
3686 kfree_skb(skb);
3687 goto errout;
3688 }
3689 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3690 errout:
3691 if (err < 0)
3692 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3693 }
3694
3695 static inline size_t inet6_prefix_nlmsg_size(void)
3696 {
3697 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3698 + nla_total_size(sizeof(struct in6_addr))
3699 + nla_total_size(sizeof(struct prefix_cacheinfo));
3700 }
3701
3702 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3703 struct prefix_info *pinfo, u32 pid, u32 seq,
3704 int event, unsigned int flags)
3705 {
3706 struct prefixmsg *pmsg;
3707 struct nlmsghdr *nlh;
3708 struct prefix_cacheinfo ci;
3709
3710 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3711 if (nlh == NULL)
3712 return -EMSGSIZE;
3713
3714 pmsg = nlmsg_data(nlh);
3715 pmsg->prefix_family = AF_INET6;
3716 pmsg->prefix_pad1 = 0;
3717 pmsg->prefix_pad2 = 0;
3718 pmsg->prefix_ifindex = idev->dev->ifindex;
3719 pmsg->prefix_len = pinfo->prefix_len;
3720 pmsg->prefix_type = pinfo->type;
3721 pmsg->prefix_pad3 = 0;
3722 pmsg->prefix_flags = 0;
3723 if (pinfo->onlink)
3724 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3725 if (pinfo->autoconf)
3726 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3727
3728 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3729
3730 ci.preferred_time = ntohl(pinfo->prefered);
3731 ci.valid_time = ntohl(pinfo->valid);
3732 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3733
3734 return nlmsg_end(skb, nlh);
3735
3736 nla_put_failure:
3737 nlmsg_cancel(skb, nlh);
3738 return -EMSGSIZE;
3739 }
3740
3741 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3742 struct prefix_info *pinfo)
3743 {
3744 struct sk_buff *skb;
3745 struct net *net = idev->dev->nd_net;
3746 int err = -ENOBUFS;
3747
3748 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3749 if (skb == NULL)
3750 goto errout;
3751
3752 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3753 if (err < 0) {
3754 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3755 WARN_ON(err == -EMSGSIZE);
3756 kfree_skb(skb);
3757 goto errout;
3758 }
3759 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3760 errout:
3761 if (err < 0)
3762 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3763 }
3764
3765 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3766 {
3767 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3768
3769 switch (event) {
3770 case RTM_NEWADDR:
3771 /*
3772 * If the address was optimistic
3773 * we inserted the route at the start of
3774 * our DAD process, so we don't need
3775 * to do it again
3776 */
3777 if (!(ifp->rt->rt6i_node))
3778 ip6_ins_rt(ifp->rt);
3779 if (ifp->idev->cnf.forwarding)
3780 addrconf_join_anycast(ifp);
3781 break;
3782 case RTM_DELADDR:
3783 if (ifp->idev->cnf.forwarding)
3784 addrconf_leave_anycast(ifp);
3785 addrconf_leave_solict(ifp->idev, &ifp->addr);
3786 dst_hold(&ifp->rt->u.dst);
3787 if (ip6_del_rt(ifp->rt))
3788 dst_free(&ifp->rt->u.dst);
3789 break;
3790 }
3791 }
3792
3793 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3794 {
3795 rcu_read_lock_bh();
3796 if (likely(ifp->idev->dead == 0))
3797 __ipv6_ifa_notify(event, ifp);
3798 rcu_read_unlock_bh();
3799 }
3800
3801 #ifdef CONFIG_SYSCTL
3802
3803 static
3804 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3805 void __user *buffer, size_t *lenp, loff_t *ppos)
3806 {
3807 int *valp = ctl->data;
3808 int val = *valp;
3809 int ret;
3810
3811 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3812
3813 if (write)
3814 addrconf_fixup_forwarding(ctl, valp, val);
3815 return ret;
3816 }
3817
3818 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3819 int __user *name, int nlen,
3820 void __user *oldval,
3821 size_t __user *oldlenp,
3822 void __user *newval, size_t newlen)
3823 {
3824 int *valp = table->data;
3825 int val = *valp;
3826 int new;
3827
3828 if (!newval || !newlen)
3829 return 0;
3830 if (newlen != sizeof(int))
3831 return -EINVAL;
3832 if (get_user(new, (int __user *)newval))
3833 return -EFAULT;
3834 if (new == *valp)
3835 return 0;
3836 if (oldval && oldlenp) {
3837 size_t len;
3838 if (get_user(len, oldlenp))
3839 return -EFAULT;
3840 if (len) {
3841 if (len > table->maxlen)
3842 len = table->maxlen;
3843 if (copy_to_user(oldval, valp, len))
3844 return -EFAULT;
3845 if (put_user(len, oldlenp))
3846 return -EFAULT;
3847 }
3848 }
3849
3850 *valp = new;
3851 addrconf_fixup_forwarding(table, valp, val);
3852 return 1;
3853 }
3854
3855 static struct addrconf_sysctl_table
3856 {
3857 struct ctl_table_header *sysctl_header;
3858 ctl_table addrconf_vars[__NET_IPV6_MAX];
3859 char *dev_name;
3860 } addrconf_sysctl __read_mostly = {
3861 .sysctl_header = NULL,
3862 .addrconf_vars = {
3863 {
3864 .ctl_name = NET_IPV6_FORWARDING,
3865 .procname = "forwarding",
3866 .data = &ipv6_devconf.forwarding,
3867 .maxlen = sizeof(int),
3868 .mode = 0644,
3869 .proc_handler = &addrconf_sysctl_forward,
3870 .strategy = &addrconf_sysctl_forward_strategy,
3871 },
3872 {
3873 .ctl_name = NET_IPV6_HOP_LIMIT,
3874 .procname = "hop_limit",
3875 .data = &ipv6_devconf.hop_limit,
3876 .maxlen = sizeof(int),
3877 .mode = 0644,
3878 .proc_handler = proc_dointvec,
3879 },
3880 {
3881 .ctl_name = NET_IPV6_MTU,
3882 .procname = "mtu",
3883 .data = &ipv6_devconf.mtu6,
3884 .maxlen = sizeof(int),
3885 .mode = 0644,
3886 .proc_handler = &proc_dointvec,
3887 },
3888 {
3889 .ctl_name = NET_IPV6_ACCEPT_RA,
3890 .procname = "accept_ra",
3891 .data = &ipv6_devconf.accept_ra,
3892 .maxlen = sizeof(int),
3893 .mode = 0644,
3894 .proc_handler = &proc_dointvec,
3895 },
3896 {
3897 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3898 .procname = "accept_redirects",
3899 .data = &ipv6_devconf.accept_redirects,
3900 .maxlen = sizeof(int),
3901 .mode = 0644,
3902 .proc_handler = &proc_dointvec,
3903 },
3904 {
3905 .ctl_name = NET_IPV6_AUTOCONF,
3906 .procname = "autoconf",
3907 .data = &ipv6_devconf.autoconf,
3908 .maxlen = sizeof(int),
3909 .mode = 0644,
3910 .proc_handler = &proc_dointvec,
3911 },
3912 {
3913 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3914 .procname = "dad_transmits",
3915 .data = &ipv6_devconf.dad_transmits,
3916 .maxlen = sizeof(int),
3917 .mode = 0644,
3918 .proc_handler = &proc_dointvec,
3919 },
3920 {
3921 .ctl_name = NET_IPV6_RTR_SOLICITS,
3922 .procname = "router_solicitations",
3923 .data = &ipv6_devconf.rtr_solicits,
3924 .maxlen = sizeof(int),
3925 .mode = 0644,
3926 .proc_handler = &proc_dointvec,
3927 },
3928 {
3929 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3930 .procname = "router_solicitation_interval",
3931 .data = &ipv6_devconf.rtr_solicit_interval,
3932 .maxlen = sizeof(int),
3933 .mode = 0644,
3934 .proc_handler = &proc_dointvec_jiffies,
3935 .strategy = &sysctl_jiffies,
3936 },
3937 {
3938 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3939 .procname = "router_solicitation_delay",
3940 .data = &ipv6_devconf.rtr_solicit_delay,
3941 .maxlen = sizeof(int),
3942 .mode = 0644,
3943 .proc_handler = &proc_dointvec_jiffies,
3944 .strategy = &sysctl_jiffies,
3945 },
3946 {
3947 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3948 .procname = "force_mld_version",
3949 .data = &ipv6_devconf.force_mld_version,
3950 .maxlen = sizeof(int),
3951 .mode = 0644,
3952 .proc_handler = &proc_dointvec,
3953 },
3954 #ifdef CONFIG_IPV6_PRIVACY
3955 {
3956 .ctl_name = NET_IPV6_USE_TEMPADDR,
3957 .procname = "use_tempaddr",
3958 .data = &ipv6_devconf.use_tempaddr,
3959 .maxlen = sizeof(int),
3960 .mode = 0644,
3961 .proc_handler = &proc_dointvec,
3962 },
3963 {
3964 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3965 .procname = "temp_valid_lft",
3966 .data = &ipv6_devconf.temp_valid_lft,
3967 .maxlen = sizeof(int),
3968 .mode = 0644,
3969 .proc_handler = &proc_dointvec,
3970 },
3971 {
3972 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3973 .procname = "temp_prefered_lft",
3974 .data = &ipv6_devconf.temp_prefered_lft,
3975 .maxlen = sizeof(int),
3976 .mode = 0644,
3977 .proc_handler = &proc_dointvec,
3978 },
3979 {
3980 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3981 .procname = "regen_max_retry",
3982 .data = &ipv6_devconf.regen_max_retry,
3983 .maxlen = sizeof(int),
3984 .mode = 0644,
3985 .proc_handler = &proc_dointvec,
3986 },
3987 {
3988 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3989 .procname = "max_desync_factor",
3990 .data = &ipv6_devconf.max_desync_factor,
3991 .maxlen = sizeof(int),
3992 .mode = 0644,
3993 .proc_handler = &proc_dointvec,
3994 },
3995 #endif
3996 {
3997 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3998 .procname = "max_addresses",
3999 .data = &ipv6_devconf.max_addresses,
4000 .maxlen = sizeof(int),
4001 .mode = 0644,
4002 .proc_handler = &proc_dointvec,
4003 },
4004 {
4005 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4006 .procname = "accept_ra_defrtr",
4007 .data = &ipv6_devconf.accept_ra_defrtr,
4008 .maxlen = sizeof(int),
4009 .mode = 0644,
4010 .proc_handler = &proc_dointvec,
4011 },
4012 {
4013 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4014 .procname = "accept_ra_pinfo",
4015 .data = &ipv6_devconf.accept_ra_pinfo,
4016 .maxlen = sizeof(int),
4017 .mode = 0644,
4018 .proc_handler = &proc_dointvec,
4019 },
4020 #ifdef CONFIG_IPV6_ROUTER_PREF
4021 {
4022 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4023 .procname = "accept_ra_rtr_pref",
4024 .data = &ipv6_devconf.accept_ra_rtr_pref,
4025 .maxlen = sizeof(int),
4026 .mode = 0644,
4027 .proc_handler = &proc_dointvec,
4028 },
4029 {
4030 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4031 .procname = "router_probe_interval",
4032 .data = &ipv6_devconf.rtr_probe_interval,
4033 .maxlen = sizeof(int),
4034 .mode = 0644,
4035 .proc_handler = &proc_dointvec_jiffies,
4036 .strategy = &sysctl_jiffies,
4037 },
4038 #ifdef CONFIG_IPV6_ROUTE_INFO
4039 {
4040 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4041 .procname = "accept_ra_rt_info_max_plen",
4042 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4043 .maxlen = sizeof(int),
4044 .mode = 0644,
4045 .proc_handler = &proc_dointvec,
4046 },
4047 #endif
4048 #endif
4049 {
4050 .ctl_name = NET_IPV6_PROXY_NDP,
4051 .procname = "proxy_ndp",
4052 .data = &ipv6_devconf.proxy_ndp,
4053 .maxlen = sizeof(int),
4054 .mode = 0644,
4055 .proc_handler = &proc_dointvec,
4056 },
4057 {
4058 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4059 .procname = "accept_source_route",
4060 .data = &ipv6_devconf.accept_source_route,
4061 .maxlen = sizeof(int),
4062 .mode = 0644,
4063 .proc_handler = &proc_dointvec,
4064 },
4065 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4066 {
4067 .ctl_name = CTL_UNNUMBERED,
4068 .procname = "optimistic_dad",
4069 .data = &ipv6_devconf.optimistic_dad,
4070 .maxlen = sizeof(int),
4071 .mode = 0644,
4072 .proc_handler = &proc_dointvec,
4073
4074 },
4075 #endif
4076 {
4077 .ctl_name = 0, /* sentinel */
4078 }
4079 },
4080 };
4081
4082 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4083 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4084 {
4085 int i;
4086 struct addrconf_sysctl_table *t;
4087
4088 #define ADDRCONF_CTL_PATH_DEV 3
4089
4090 struct ctl_path addrconf_ctl_path[] = {
4091 { .procname = "net", .ctl_name = CTL_NET, },
4092 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4093 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4094 { /* to be set */ },
4095 { },
4096 };
4097
4098
4099 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4100 if (t == NULL)
4101 goto out;
4102
4103 for (i=0; t->addrconf_vars[i].data; i++) {
4104 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4105 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4106 t->addrconf_vars[i].extra2 = net;
4107 }
4108
4109 /*
4110 * Make a copy of dev_name, because '.procname' is regarded as const
4111 * by sysctl and we wouldn't want anyone to change it under our feet
4112 * (see SIOCSIFNAME).
4113 */
4114 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4115 if (!t->dev_name)
4116 goto free;
4117
4118 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4119 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4120
4121 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4122 t->addrconf_vars);
4123 if (t->sysctl_header == NULL)
4124 goto free_procname;
4125
4126 p->sysctl = t;
4127 return 0;
4128
4129 free_procname:
4130 kfree(t->dev_name);
4131 free:
4132 kfree(t);
4133 out:
4134 return -ENOBUFS;
4135 }
4136
4137 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4138 {
4139 struct addrconf_sysctl_table *t;
4140
4141 if (p->sysctl == NULL)
4142 return;
4143
4144 t = p->sysctl;
4145 p->sysctl = NULL;
4146 unregister_sysctl_table(t->sysctl_header);
4147 kfree(t->dev_name);
4148 kfree(t);
4149 }
4150
4151 static void addrconf_sysctl_register(struct inet6_dev *idev)
4152 {
4153 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4154 NET_IPV6_NEIGH, "ipv6",
4155 &ndisc_ifinfo_sysctl_change,
4156 NULL);
4157 __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
4158 idev->dev->ifindex, idev, &idev->cnf);
4159 }
4160
4161 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4162 {
4163 __addrconf_sysctl_unregister(&idev->cnf);
4164 neigh_sysctl_unregister(idev->nd_parms);
4165 }
4166
4167
4168 #endif
4169
4170 static int addrconf_init_net(struct net *net)
4171 {
4172 int err;
4173 struct ipv6_devconf *all, *dflt;
4174
4175 err = -ENOMEM;
4176 all = &ipv6_devconf;
4177 dflt = &ipv6_devconf_dflt;
4178
4179 if (net != &init_net) {
4180 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4181 if (all == NULL)
4182 goto err_alloc_all;
4183
4184 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4185 if (dflt == NULL)
4186 goto err_alloc_dflt;
4187 }
4188
4189 net->ipv6.devconf_all = all;
4190 net->ipv6.devconf_dflt = dflt;
4191
4192 #ifdef CONFIG_SYSCTL
4193 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4194 NULL, all);
4195 if (err < 0)
4196 goto err_reg_all;
4197
4198 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4199 NULL, dflt);
4200 if (err < 0)
4201 goto err_reg_dflt;
4202 #endif
4203 return 0;
4204
4205 #ifdef CONFIG_SYSCTL
4206 err_reg_dflt:
4207 __addrconf_sysctl_unregister(all);
4208 err_reg_all:
4209 kfree(dflt);
4210 #endif
4211 err_alloc_dflt:
4212 kfree(all);
4213 err_alloc_all:
4214 return err;
4215 }
4216
4217 static void addrconf_exit_net(struct net *net)
4218 {
4219 #ifdef CONFIG_SYSCTL
4220 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4221 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4222 #endif
4223 if (net != &init_net) {
4224 kfree(net->ipv6.devconf_dflt);
4225 kfree(net->ipv6.devconf_all);
4226 }
4227 }
4228
4229 static struct pernet_operations addrconf_ops = {
4230 .init = addrconf_init_net,
4231 .exit = addrconf_exit_net,
4232 };
4233
4234 /*
4235 * Device notifier
4236 */
4237
4238 int register_inet6addr_notifier(struct notifier_block *nb)
4239 {
4240 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4241 }
4242
4243 EXPORT_SYMBOL(register_inet6addr_notifier);
4244
4245 int unregister_inet6addr_notifier(struct notifier_block *nb)
4246 {
4247 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4248 }
4249
4250 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4251
4252
4253 static int addrconf_net_init(struct net *net)
4254 {
4255 return 0;
4256 }
4257
4258 static void addrconf_net_exit(struct net *net)
4259 {
4260 struct net_device *dev;
4261
4262 rtnl_lock();
4263 /* clean dev list */
4264 for_each_netdev(net, dev) {
4265 if (__in6_dev_get(dev) == NULL)
4266 continue;
4267 addrconf_ifdown(dev, 1);
4268 }
4269 addrconf_ifdown(net->loopback_dev, 2);
4270 rtnl_unlock();
4271 }
4272
4273 static struct pernet_operations addrconf_net_ops = {
4274 .init = addrconf_net_init,
4275 .exit = addrconf_net_exit,
4276 };
4277
4278 /*
4279 * Init / cleanup code
4280 */
4281
4282 int __init addrconf_init(void)
4283 {
4284 int err;
4285
4286 if ((err = ipv6_addr_label_init()) < 0) {
4287 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4288 err);
4289 return err;
4290 }
4291
4292 register_pernet_subsys(&addrconf_ops);
4293
4294 /* The addrconf netdev notifier requires that loopback_dev
4295 * has it's ipv6 private information allocated and setup
4296 * before it can bring up and give link-local addresses
4297 * to other devices which are up.
4298 *
4299 * Unfortunately, loopback_dev is not necessarily the first
4300 * entry in the global dev_base list of net devices. In fact,
4301 * it is likely to be the very last entry on that list.
4302 * So this causes the notifier registry below to try and
4303 * give link-local addresses to all devices besides loopback_dev
4304 * first, then loopback_dev, which cases all the non-loopback_dev
4305 * devices to fail to get a link-local address.
4306 *
4307 * So, as a temporary fix, allocate the ipv6 structure for
4308 * loopback_dev first by hand.
4309 * Longer term, all of the dependencies ipv6 has upon the loopback
4310 * device and it being up should be removed.
4311 */
4312 rtnl_lock();
4313 if (!ipv6_add_dev(init_net.loopback_dev))
4314 err = -ENOMEM;
4315 rtnl_unlock();
4316 if (err)
4317 goto errlo;
4318
4319 err = register_pernet_device(&addrconf_net_ops);
4320 if (err)
4321 return err;
4322
4323 register_netdevice_notifier(&ipv6_dev_notf);
4324
4325 addrconf_verify(0);
4326
4327 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4328 if (err < 0)
4329 goto errout;
4330
4331 /* Only the first call to __rtnl_register can fail */
4332 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4333 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4334 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4335 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4336 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4337
4338 ipv6_addr_label_rtnl_register();
4339
4340 return 0;
4341 errout:
4342 unregister_netdevice_notifier(&ipv6_dev_notf);
4343 errlo:
4344 unregister_pernet_subsys(&addrconf_ops);
4345
4346 return err;
4347 }
4348
4349 void addrconf_cleanup(void)
4350 {
4351 struct inet6_ifaddr *ifa;
4352 int i;
4353
4354 unregister_netdevice_notifier(&ipv6_dev_notf);
4355 unregister_pernet_device(&addrconf_net_ops);
4356
4357 unregister_pernet_subsys(&addrconf_ops);
4358
4359 rtnl_lock();
4360
4361 /*
4362 * Check hash table.
4363 */
4364 write_lock_bh(&addrconf_hash_lock);
4365 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4366 for (ifa=inet6_addr_lst[i]; ifa; ) {
4367 struct inet6_ifaddr *bifa;
4368
4369 bifa = ifa;
4370 ifa = ifa->lst_next;
4371 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4372 /* Do not free it; something is wrong.
4373 Now we can investigate it with debugger.
4374 */
4375 }
4376 }
4377 write_unlock_bh(&addrconf_hash_lock);
4378
4379 del_timer(&addr_chk_timer);
4380 rtnl_unlock();
4381
4382 unregister_pernet_subsys(&addrconf_net_ops);
4383 }