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[IPV6]: Restore IPv6 when MTU is big enough
[deliverable/linux.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $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, struct ipv6_devconf *p);
105 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
106 #endif
107
108 #ifdef CONFIG_IPV6_PRIVACY
109 static int __ipv6_regen_rndid(struct inet6_dev *idev);
110 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
111 static void ipv6_regen_rndid(unsigned long data);
112
113 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
114 #endif
115
116 static int ipv6_count_addresses(struct inet6_dev *idev);
117
118 /*
119 * Configured unicast address hash table
120 */
121 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
122 static DEFINE_RWLOCK(addrconf_hash_lock);
123
124 static void addrconf_verify(unsigned long);
125
126 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
127 static DEFINE_SPINLOCK(addrconf_verify_lock);
128
129 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
130 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
131
132 static int addrconf_ifdown(struct net_device *dev, int how);
133
134 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
135 static void addrconf_dad_timer(unsigned long data);
136 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
137 static void addrconf_dad_run(struct inet6_dev *idev);
138 static void addrconf_rs_timer(unsigned long data);
139 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
140 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
141
142 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
143 struct prefix_info *pinfo);
144 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
145
146 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
147
148 struct ipv6_devconf ipv6_devconf __read_mostly = {
149 .forwarding = 0,
150 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
151 .mtu6 = IPV6_MIN_MTU,
152 .accept_ra = 1,
153 .accept_redirects = 1,
154 .autoconf = 1,
155 .force_mld_version = 0,
156 .dad_transmits = 1,
157 .rtr_solicits = MAX_RTR_SOLICITATIONS,
158 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
159 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
160 #ifdef CONFIG_IPV6_PRIVACY
161 .use_tempaddr = 0,
162 .temp_valid_lft = TEMP_VALID_LIFETIME,
163 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
164 .regen_max_retry = REGEN_MAX_RETRY,
165 .max_desync_factor = MAX_DESYNC_FACTOR,
166 #endif
167 .max_addresses = IPV6_MAX_ADDRESSES,
168 .accept_ra_defrtr = 1,
169 .accept_ra_pinfo = 1,
170 #ifdef CONFIG_IPV6_ROUTER_PREF
171 .accept_ra_rtr_pref = 1,
172 .rtr_probe_interval = 60 * HZ,
173 #ifdef CONFIG_IPV6_ROUTE_INFO
174 .accept_ra_rt_info_max_plen = 0,
175 #endif
176 #endif
177 .proxy_ndp = 0,
178 .accept_source_route = 0, /* we do not accept RH0 by default. */
179 };
180
181 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
182 .forwarding = 0,
183 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
184 .mtu6 = IPV6_MIN_MTU,
185 .accept_ra = 1,
186 .accept_redirects = 1,
187 .autoconf = 1,
188 .dad_transmits = 1,
189 .rtr_solicits = MAX_RTR_SOLICITATIONS,
190 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
191 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
192 #ifdef CONFIG_IPV6_PRIVACY
193 .use_tempaddr = 0,
194 .temp_valid_lft = TEMP_VALID_LIFETIME,
195 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
196 .regen_max_retry = REGEN_MAX_RETRY,
197 .max_desync_factor = MAX_DESYNC_FACTOR,
198 #endif
199 .max_addresses = IPV6_MAX_ADDRESSES,
200 .accept_ra_defrtr = 1,
201 .accept_ra_pinfo = 1,
202 #ifdef CONFIG_IPV6_ROUTER_PREF
203 .accept_ra_rtr_pref = 1,
204 .rtr_probe_interval = 60 * HZ,
205 #ifdef CONFIG_IPV6_ROUTE_INFO
206 .accept_ra_rt_info_max_plen = 0,
207 #endif
208 #endif
209 .proxy_ndp = 0,
210 .accept_source_route = 0, /* we do not accept RH0 by default. */
211 };
212
213 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
214 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
215 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
216
217 /* Check if a valid qdisc is available */
218 static inline int addrconf_qdisc_ok(struct net_device *dev)
219 {
220 return (dev->qdisc != &noop_qdisc);
221 }
222
223 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
224 {
225 if (del_timer(&ifp->timer))
226 __in6_ifa_put(ifp);
227 }
228
229 enum addrconf_timer_t
230 {
231 AC_NONE,
232 AC_DAD,
233 AC_RS,
234 };
235
236 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
237 enum addrconf_timer_t what,
238 unsigned long when)
239 {
240 if (!del_timer(&ifp->timer))
241 in6_ifa_hold(ifp);
242
243 switch (what) {
244 case AC_DAD:
245 ifp->timer.function = addrconf_dad_timer;
246 break;
247 case AC_RS:
248 ifp->timer.function = addrconf_rs_timer;
249 break;
250 default:;
251 }
252 ifp->timer.expires = jiffies + when;
253 add_timer(&ifp->timer);
254 }
255
256 static int snmp6_alloc_dev(struct inet6_dev *idev)
257 {
258 if (snmp_mib_init((void **)idev->stats.ipv6,
259 sizeof(struct ipstats_mib),
260 __alignof__(struct ipstats_mib)) < 0)
261 goto err_ip;
262 if (snmp_mib_init((void **)idev->stats.icmpv6,
263 sizeof(struct icmpv6_mib),
264 __alignof__(struct icmpv6_mib)) < 0)
265 goto err_icmp;
266 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
267 sizeof(struct icmpv6msg_mib),
268 __alignof__(struct icmpv6msg_mib)) < 0)
269 goto err_icmpmsg;
270
271 return 0;
272
273 err_icmpmsg:
274 snmp_mib_free((void **)idev->stats.icmpv6);
275 err_icmp:
276 snmp_mib_free((void **)idev->stats.ipv6);
277 err_ip:
278 return -ENOMEM;
279 }
280
281 static void snmp6_free_dev(struct inet6_dev *idev)
282 {
283 snmp_mib_free((void **)idev->stats.icmpv6msg);
284 snmp_mib_free((void **)idev->stats.icmpv6);
285 snmp_mib_free((void **)idev->stats.ipv6);
286 }
287
288 /* Nobody refers to this device, we may destroy it. */
289
290 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
291 {
292 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
293 kfree(idev);
294 }
295
296 void in6_dev_finish_destroy(struct inet6_dev *idev)
297 {
298 struct net_device *dev = idev->dev;
299 BUG_TRAP(idev->addr_list==NULL);
300 BUG_TRAP(idev->mc_list==NULL);
301 #ifdef NET_REFCNT_DEBUG
302 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
303 #endif
304 dev_put(dev);
305 if (!idev->dead) {
306 printk("Freeing alive inet6 device %p\n", idev);
307 return;
308 }
309 snmp6_free_dev(idev);
310 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
311 }
312
313 EXPORT_SYMBOL(in6_dev_finish_destroy);
314
315 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
316 {
317 struct inet6_dev *ndev;
318 struct in6_addr maddr;
319
320 ASSERT_RTNL();
321
322 if (dev->mtu < IPV6_MIN_MTU)
323 return NULL;
324
325 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
326
327 if (ndev == NULL)
328 return NULL;
329
330 rwlock_init(&ndev->lock);
331 ndev->dev = dev;
332 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
333 ndev->cnf.mtu6 = dev->mtu;
334 ndev->cnf.sysctl = NULL;
335 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
336 if (ndev->nd_parms == NULL) {
337 kfree(ndev);
338 return NULL;
339 }
340 /* We refer to the device */
341 dev_hold(dev);
342
343 if (snmp6_alloc_dev(ndev) < 0) {
344 ADBG((KERN_WARNING
345 "%s(): cannot allocate memory for statistics; dev=%s.\n",
346 __FUNCTION__, dev->name));
347 neigh_parms_release(&nd_tbl, ndev->nd_parms);
348 ndev->dead = 1;
349 in6_dev_finish_destroy(ndev);
350 return NULL;
351 }
352
353 if (snmp6_register_dev(ndev) < 0) {
354 ADBG((KERN_WARNING
355 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
356 __FUNCTION__, dev->name));
357 neigh_parms_release(&nd_tbl, ndev->nd_parms);
358 ndev->dead = 1;
359 in6_dev_finish_destroy(ndev);
360 return NULL;
361 }
362
363 /* One reference from device. We must do this before
364 * we invoke __ipv6_regen_rndid().
365 */
366 in6_dev_hold(ndev);
367
368 #ifdef CONFIG_IPV6_PRIVACY
369 init_timer(&ndev->regen_timer);
370 ndev->regen_timer.function = ipv6_regen_rndid;
371 ndev->regen_timer.data = (unsigned long) ndev;
372 if ((dev->flags&IFF_LOOPBACK) ||
373 dev->type == ARPHRD_TUNNEL ||
374 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
375 dev->type == ARPHRD_SIT ||
376 #endif
377 dev->type == ARPHRD_NONE) {
378 printk(KERN_INFO
379 "%s: Disabled Privacy Extensions\n",
380 dev->name);
381 ndev->cnf.use_tempaddr = -1;
382 } else {
383 in6_dev_hold(ndev);
384 ipv6_regen_rndid((unsigned long) ndev);
385 }
386 #endif
387
388 if (netif_running(dev) && addrconf_qdisc_ok(dev))
389 ndev->if_flags |= IF_READY;
390
391 ipv6_mc_init_dev(ndev);
392 ndev->tstamp = jiffies;
393 #ifdef CONFIG_SYSCTL
394 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
395 NET_IPV6_NEIGH, "ipv6",
396 &ndisc_ifinfo_sysctl_change,
397 NULL);
398 addrconf_sysctl_register(ndev, &ndev->cnf);
399 #endif
400 /* protected by rtnl_lock */
401 rcu_assign_pointer(dev->ip6_ptr, ndev);
402
403 /* Join all-node multicast group */
404 ipv6_addr_all_nodes(&maddr);
405 ipv6_dev_mc_inc(dev, &maddr);
406
407 return ndev;
408 }
409
410 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
411 {
412 struct inet6_dev *idev;
413
414 ASSERT_RTNL();
415
416 if ((idev = __in6_dev_get(dev)) == NULL) {
417 if ((idev = ipv6_add_dev(dev)) == NULL)
418 return NULL;
419 }
420
421 if (dev->flags&IFF_UP)
422 ipv6_mc_up(idev);
423 return idev;
424 }
425
426 #ifdef CONFIG_SYSCTL
427 static void dev_forward_change(struct inet6_dev *idev)
428 {
429 struct net_device *dev;
430 struct inet6_ifaddr *ifa;
431 struct in6_addr addr;
432
433 if (!idev)
434 return;
435 dev = idev->dev;
436 if (dev && (dev->flags & IFF_MULTICAST)) {
437 ipv6_addr_all_routers(&addr);
438
439 if (idev->cnf.forwarding)
440 ipv6_dev_mc_inc(dev, &addr);
441 else
442 ipv6_dev_mc_dec(dev, &addr);
443 }
444 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
445 if (ifa->flags&IFA_F_TENTATIVE)
446 continue;
447 if (idev->cnf.forwarding)
448 addrconf_join_anycast(ifa);
449 else
450 addrconf_leave_anycast(ifa);
451 }
452 }
453
454
455 static void addrconf_forward_change(void)
456 {
457 struct net_device *dev;
458 struct inet6_dev *idev;
459
460 read_lock(&dev_base_lock);
461 for_each_netdev(&init_net, dev) {
462 rcu_read_lock();
463 idev = __in6_dev_get(dev);
464 if (idev) {
465 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
466 idev->cnf.forwarding = ipv6_devconf.forwarding;
467 if (changed)
468 dev_forward_change(idev);
469 }
470 rcu_read_unlock();
471 }
472 read_unlock(&dev_base_lock);
473 }
474 #endif
475
476 /* Nobody refers to this ifaddr, destroy it */
477
478 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
479 {
480 BUG_TRAP(ifp->if_next==NULL);
481 BUG_TRAP(ifp->lst_next==NULL);
482 #ifdef NET_REFCNT_DEBUG
483 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
484 #endif
485
486 in6_dev_put(ifp->idev);
487
488 if (del_timer(&ifp->timer))
489 printk("Timer is still running, when freeing ifa=%p\n", ifp);
490
491 if (!ifp->dead) {
492 printk("Freeing alive inet6 address %p\n", ifp);
493 return;
494 }
495 dst_release(&ifp->rt->u.dst);
496
497 kfree(ifp);
498 }
499
500 static void
501 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
502 {
503 struct inet6_ifaddr *ifa, **ifap;
504 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
505
506 /*
507 * Each device address list is sorted in order of scope -
508 * global before linklocal.
509 */
510 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
511 ifap = &ifa->if_next) {
512 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
513 break;
514 }
515
516 ifp->if_next = *ifap;
517 *ifap = ifp;
518 }
519
520 /* On success it returns ifp with increased reference count */
521
522 static struct inet6_ifaddr *
523 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
524 int scope, u32 flags)
525 {
526 struct inet6_ifaddr *ifa = NULL;
527 struct rt6_info *rt;
528 int hash;
529 int err = 0;
530
531 rcu_read_lock_bh();
532 if (idev->dead) {
533 err = -ENODEV; /*XXX*/
534 goto out2;
535 }
536
537 write_lock(&addrconf_hash_lock);
538
539 /* Ignore adding duplicate addresses on an interface */
540 if (ipv6_chk_same_addr(addr, idev->dev)) {
541 ADBG(("ipv6_add_addr: already assigned\n"));
542 err = -EEXIST;
543 goto out;
544 }
545
546 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
547
548 if (ifa == NULL) {
549 ADBG(("ipv6_add_addr: malloc failed\n"));
550 err = -ENOBUFS;
551 goto out;
552 }
553
554 rt = addrconf_dst_alloc(idev, addr, 0);
555 if (IS_ERR(rt)) {
556 err = PTR_ERR(rt);
557 goto out;
558 }
559
560 ipv6_addr_copy(&ifa->addr, addr);
561
562 spin_lock_init(&ifa->lock);
563 init_timer(&ifa->timer);
564 ifa->timer.data = (unsigned long) ifa;
565 ifa->scope = scope;
566 ifa->prefix_len = pfxlen;
567 ifa->flags = flags | IFA_F_TENTATIVE;
568 ifa->cstamp = ifa->tstamp = jiffies;
569
570 ifa->rt = rt;
571
572 /*
573 * part one of RFC 4429, section 3.3
574 * We should not configure an address as
575 * optimistic if we do not yet know the link
576 * layer address of our nexhop router
577 */
578
579 if (rt->rt6i_nexthop == NULL)
580 ifa->flags &= ~IFA_F_OPTIMISTIC;
581
582 ifa->idev = idev;
583 in6_dev_hold(idev);
584 /* For caller */
585 in6_ifa_hold(ifa);
586
587 /* Add to big hash table */
588 hash = ipv6_addr_hash(addr);
589
590 ifa->lst_next = inet6_addr_lst[hash];
591 inet6_addr_lst[hash] = ifa;
592 in6_ifa_hold(ifa);
593 write_unlock(&addrconf_hash_lock);
594
595 write_lock(&idev->lock);
596 /* Add to inet6_dev unicast addr list. */
597 ipv6_link_dev_addr(idev, ifa);
598
599 #ifdef CONFIG_IPV6_PRIVACY
600 if (ifa->flags&IFA_F_TEMPORARY) {
601 ifa->tmp_next = idev->tempaddr_list;
602 idev->tempaddr_list = ifa;
603 in6_ifa_hold(ifa);
604 }
605 #endif
606
607 in6_ifa_hold(ifa);
608 write_unlock(&idev->lock);
609 out2:
610 rcu_read_unlock_bh();
611
612 if (likely(err == 0))
613 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
614 else {
615 kfree(ifa);
616 ifa = ERR_PTR(err);
617 }
618
619 return ifa;
620 out:
621 write_unlock(&addrconf_hash_lock);
622 goto out2;
623 }
624
625 /* This function wants to get referenced ifp and releases it before return */
626
627 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
628 {
629 struct inet6_ifaddr *ifa, **ifap;
630 struct inet6_dev *idev = ifp->idev;
631 int hash;
632 int deleted = 0, onlink = 0;
633 unsigned long expires = jiffies;
634
635 hash = ipv6_addr_hash(&ifp->addr);
636
637 ifp->dead = 1;
638
639 write_lock_bh(&addrconf_hash_lock);
640 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
641 ifap = &ifa->lst_next) {
642 if (ifa == ifp) {
643 *ifap = ifa->lst_next;
644 __in6_ifa_put(ifp);
645 ifa->lst_next = NULL;
646 break;
647 }
648 }
649 write_unlock_bh(&addrconf_hash_lock);
650
651 write_lock_bh(&idev->lock);
652 #ifdef CONFIG_IPV6_PRIVACY
653 if (ifp->flags&IFA_F_TEMPORARY) {
654 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
655 ifap = &ifa->tmp_next) {
656 if (ifa == ifp) {
657 *ifap = ifa->tmp_next;
658 if (ifp->ifpub) {
659 in6_ifa_put(ifp->ifpub);
660 ifp->ifpub = NULL;
661 }
662 __in6_ifa_put(ifp);
663 ifa->tmp_next = NULL;
664 break;
665 }
666 }
667 }
668 #endif
669
670 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
671 if (ifa == ifp) {
672 *ifap = ifa->if_next;
673 __in6_ifa_put(ifp);
674 ifa->if_next = NULL;
675 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
676 break;
677 deleted = 1;
678 continue;
679 } else if (ifp->flags & IFA_F_PERMANENT) {
680 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
681 ifp->prefix_len)) {
682 if (ifa->flags & IFA_F_PERMANENT) {
683 onlink = 1;
684 if (deleted)
685 break;
686 } else {
687 unsigned long lifetime;
688
689 if (!onlink)
690 onlink = -1;
691
692 spin_lock(&ifa->lock);
693 lifetime = min_t(unsigned long,
694 ifa->valid_lft, 0x7fffffffUL/HZ);
695 if (time_before(expires,
696 ifa->tstamp + lifetime * HZ))
697 expires = ifa->tstamp + lifetime * HZ;
698 spin_unlock(&ifa->lock);
699 }
700 }
701 }
702 ifap = &ifa->if_next;
703 }
704 write_unlock_bh(&idev->lock);
705
706 ipv6_ifa_notify(RTM_DELADDR, ifp);
707
708 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
709
710 addrconf_del_timer(ifp);
711
712 /*
713 * Purge or update corresponding prefix
714 *
715 * 1) we don't purge prefix here if address was not permanent.
716 * prefix is managed by its own lifetime.
717 * 2) if there're no addresses, delete prefix.
718 * 3) if there're still other permanent address(es),
719 * corresponding prefix is still permanent.
720 * 4) otherwise, update prefix lifetime to the
721 * longest valid lifetime among the corresponding
722 * addresses on the device.
723 * Note: subsequent RA will update lifetime.
724 *
725 * --yoshfuji
726 */
727 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
728 struct in6_addr prefix;
729 struct rt6_info *rt;
730
731 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
732 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
733
734 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
735 if (onlink == 0) {
736 ip6_del_rt(rt);
737 rt = NULL;
738 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
739 rt->rt6i_expires = expires;
740 rt->rt6i_flags |= RTF_EXPIRES;
741 }
742 }
743 dst_release(&rt->u.dst);
744 }
745
746 in6_ifa_put(ifp);
747 }
748
749 #ifdef CONFIG_IPV6_PRIVACY
750 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
751 {
752 struct inet6_dev *idev = ifp->idev;
753 struct in6_addr addr, *tmpaddr;
754 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
755 int tmp_plen;
756 int ret = 0;
757 int max_addresses;
758 u32 addr_flags;
759
760 write_lock(&idev->lock);
761 if (ift) {
762 spin_lock_bh(&ift->lock);
763 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
764 spin_unlock_bh(&ift->lock);
765 tmpaddr = &addr;
766 } else {
767 tmpaddr = NULL;
768 }
769 retry:
770 in6_dev_hold(idev);
771 if (idev->cnf.use_tempaddr <= 0) {
772 write_unlock(&idev->lock);
773 printk(KERN_INFO
774 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
775 in6_dev_put(idev);
776 ret = -1;
777 goto out;
778 }
779 spin_lock_bh(&ifp->lock);
780 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
781 idev->cnf.use_tempaddr = -1; /*XXX*/
782 spin_unlock_bh(&ifp->lock);
783 write_unlock(&idev->lock);
784 printk(KERN_WARNING
785 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
786 in6_dev_put(idev);
787 ret = -1;
788 goto out;
789 }
790 in6_ifa_hold(ifp);
791 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
792 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
793 spin_unlock_bh(&ifp->lock);
794 write_unlock(&idev->lock);
795 printk(KERN_WARNING
796 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
797 in6_ifa_put(ifp);
798 in6_dev_put(idev);
799 ret = -1;
800 goto out;
801 }
802 memcpy(&addr.s6_addr[8], idev->rndid, 8);
803 tmp_valid_lft = min_t(__u32,
804 ifp->valid_lft,
805 idev->cnf.temp_valid_lft);
806 tmp_prefered_lft = min_t(__u32,
807 ifp->prefered_lft,
808 idev->cnf.temp_prefered_lft - desync_factor / HZ);
809 tmp_plen = ifp->prefix_len;
810 max_addresses = idev->cnf.max_addresses;
811 tmp_cstamp = ifp->cstamp;
812 tmp_tstamp = ifp->tstamp;
813 spin_unlock_bh(&ifp->lock);
814
815 write_unlock(&idev->lock);
816
817 addr_flags = IFA_F_TEMPORARY;
818 /* set in addrconf_prefix_rcv() */
819 if (ifp->flags & IFA_F_OPTIMISTIC)
820 addr_flags |= IFA_F_OPTIMISTIC;
821
822 ift = !max_addresses ||
823 ipv6_count_addresses(idev) < max_addresses ?
824 ipv6_add_addr(idev, &addr, tmp_plen,
825 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
826 addr_flags) : NULL;
827 if (!ift || IS_ERR(ift)) {
828 in6_ifa_put(ifp);
829 in6_dev_put(idev);
830 printk(KERN_INFO
831 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
832 tmpaddr = &addr;
833 write_lock(&idev->lock);
834 goto retry;
835 }
836
837 spin_lock_bh(&ift->lock);
838 ift->ifpub = ifp;
839 ift->valid_lft = tmp_valid_lft;
840 ift->prefered_lft = tmp_prefered_lft;
841 ift->cstamp = tmp_cstamp;
842 ift->tstamp = tmp_tstamp;
843 spin_unlock_bh(&ift->lock);
844
845 addrconf_dad_start(ift, 0);
846 in6_ifa_put(ift);
847 in6_dev_put(idev);
848 out:
849 return ret;
850 }
851 #endif
852
853 /*
854 * Choose an appropriate source address (RFC3484)
855 */
856 struct ipv6_saddr_score {
857 int addr_type;
858 unsigned int attrs;
859 int matchlen;
860 int scope;
861 unsigned int rule;
862 };
863
864 #define IPV6_SADDR_SCORE_LOCAL 0x0001
865 #define IPV6_SADDR_SCORE_PREFERRED 0x0004
866 #define IPV6_SADDR_SCORE_HOA 0x0008
867 #define IPV6_SADDR_SCORE_OIF 0x0010
868 #define IPV6_SADDR_SCORE_LABEL 0x0020
869 #define IPV6_SADDR_SCORE_PRIVACY 0x0040
870
871 static inline int ipv6_saddr_preferred(int type)
872 {
873 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
874 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
875 return 1;
876 return 0;
877 }
878
879 /* static matching label */
880 static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
881 {
882 /*
883 * prefix (longest match) label
884 * -----------------------------
885 * ::1/128 0
886 * ::/0 1
887 * 2002::/16 2
888 * ::/96 3
889 * ::ffff:0:0/96 4
890 * fc00::/7 5
891 * 2001::/32 6
892 */
893 if (type & IPV6_ADDR_LOOPBACK)
894 return 0;
895 else if (type & IPV6_ADDR_COMPATv4)
896 return 3;
897 else if (type & IPV6_ADDR_MAPPED)
898 return 4;
899 else if (addr->s6_addr32[0] == htonl(0x20010000))
900 return 6;
901 else if (addr->s6_addr16[0] == htons(0x2002))
902 return 2;
903 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
904 return 5;
905 return 1;
906 }
907
908 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
909 struct in6_addr *daddr, struct in6_addr *saddr)
910 {
911 struct ipv6_saddr_score hiscore;
912 struct inet6_ifaddr *ifa_result = NULL;
913 int daddr_type = __ipv6_addr_type(daddr);
914 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
915 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
916 struct net_device *dev;
917
918 memset(&hiscore, 0, sizeof(hiscore));
919
920 read_lock(&dev_base_lock);
921 rcu_read_lock();
922
923 for_each_netdev(&init_net, dev) {
924 struct inet6_dev *idev;
925 struct inet6_ifaddr *ifa;
926
927 /* Rule 0: Candidate Source Address (section 4)
928 * - multicast and link-local destination address,
929 * the set of candidate source address MUST only
930 * include addresses assigned to interfaces
931 * belonging to the same link as the outgoing
932 * interface.
933 * (- For site-local destination addresses, the
934 * set of candidate source addresses MUST only
935 * include addresses assigned to interfaces
936 * belonging to the same site as the outgoing
937 * interface.)
938 */
939 if ((daddr_type & IPV6_ADDR_MULTICAST ||
940 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
941 daddr_dev && dev != daddr_dev)
942 continue;
943
944 idev = __in6_dev_get(dev);
945 if (!idev)
946 continue;
947
948 read_lock_bh(&idev->lock);
949 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
950 struct ipv6_saddr_score score;
951
952 score.addr_type = __ipv6_addr_type(&ifa->addr);
953
954 /* Rule 0:
955 * - Tentative Address (RFC2462 section 5.4)
956 * - A tentative address is not considered
957 * "assigned to an interface" in the traditional
958 * sense, unless it is also flagged as optimistic.
959 * - Candidate Source Address (section 4)
960 * - In any case, anycast addresses, multicast
961 * addresses, and the unspecified address MUST
962 * NOT be included in a candidate set.
963 */
964 if ((ifa->flags & IFA_F_TENTATIVE) &&
965 (!(ifa->flags & IFA_F_OPTIMISTIC)))
966 continue;
967 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
968 score.addr_type & IPV6_ADDR_MULTICAST)) {
969 LIMIT_NETDEBUG(KERN_DEBUG
970 "ADDRCONF: unspecified / multicast address "
971 "assigned as unicast address on %s",
972 dev->name);
973 continue;
974 }
975
976 score.attrs = 0;
977 score.matchlen = 0;
978 score.scope = 0;
979 score.rule = 0;
980
981 if (ifa_result == NULL) {
982 /* record it if the first available entry */
983 goto record_it;
984 }
985
986 /* Rule 1: Prefer same address */
987 if (hiscore.rule < 1) {
988 if (ipv6_addr_equal(&ifa_result->addr, daddr))
989 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
990 hiscore.rule++;
991 }
992 if (ipv6_addr_equal(&ifa->addr, daddr)) {
993 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
994 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
995 score.rule = 1;
996 goto record_it;
997 }
998 } else {
999 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
1000 continue;
1001 }
1002
1003 /* Rule 2: Prefer appropriate scope */
1004 if (hiscore.rule < 2) {
1005 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1006 hiscore.rule++;
1007 }
1008 score.scope = __ipv6_addr_src_scope(score.addr_type);
1009 if (hiscore.scope < score.scope) {
1010 if (hiscore.scope < daddr_scope) {
1011 score.rule = 2;
1012 goto record_it;
1013 } else
1014 continue;
1015 } else if (score.scope < hiscore.scope) {
1016 if (score.scope < daddr_scope)
1017 break; /* addresses sorted by scope */
1018 else {
1019 score.rule = 2;
1020 goto record_it;
1021 }
1022 }
1023
1024 /* Rule 3: Avoid deprecated and optimistic addresses */
1025 if (hiscore.rule < 3) {
1026 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1027 (((ifa_result->flags &
1028 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1029 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1030 hiscore.rule++;
1031 }
1032 if (ipv6_saddr_preferred(score.addr_type) ||
1033 (((ifa->flags &
1034 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1035 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1036 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1037 score.rule = 3;
1038 goto record_it;
1039 }
1040 } else {
1041 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1042 continue;
1043 }
1044
1045 /* Rule 4: Prefer home address */
1046 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1047 if (hiscore.rule < 4) {
1048 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1049 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1050 hiscore.rule++;
1051 }
1052 if (ifa->flags & IFA_F_HOMEADDRESS) {
1053 score.attrs |= IPV6_SADDR_SCORE_HOA;
1054 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1055 score.rule = 4;
1056 goto record_it;
1057 }
1058 } else {
1059 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1060 continue;
1061 }
1062 #else
1063 if (hiscore.rule < 4)
1064 hiscore.rule++;
1065 #endif
1066
1067 /* Rule 5: Prefer outgoing interface */
1068 if (hiscore.rule < 5) {
1069 if (daddr_dev == NULL ||
1070 daddr_dev == ifa_result->idev->dev)
1071 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1072 hiscore.rule++;
1073 }
1074 if (daddr_dev == NULL ||
1075 daddr_dev == ifa->idev->dev) {
1076 score.attrs |= IPV6_SADDR_SCORE_OIF;
1077 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1078 score.rule = 5;
1079 goto record_it;
1080 }
1081 } else {
1082 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1083 continue;
1084 }
1085
1086 /* Rule 6: Prefer matching label */
1087 if (hiscore.rule < 6) {
1088 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1089 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1090 hiscore.rule++;
1091 }
1092 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1093 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1094 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1095 score.rule = 6;
1096 goto record_it;
1097 }
1098 } else {
1099 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1100 continue;
1101 }
1102
1103 #ifdef CONFIG_IPV6_PRIVACY
1104 /* Rule 7: Prefer public address
1105 * Note: prefer temprary address if use_tempaddr >= 2
1106 */
1107 if (hiscore.rule < 7) {
1108 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1109 (ifa_result->idev->cnf.use_tempaddr >= 2))
1110 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1111 hiscore.rule++;
1112 }
1113 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1114 (ifa->idev->cnf.use_tempaddr >= 2)) {
1115 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1116 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1117 score.rule = 7;
1118 goto record_it;
1119 }
1120 } else {
1121 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1122 continue;
1123 }
1124 #else
1125 if (hiscore.rule < 7)
1126 hiscore.rule++;
1127 #endif
1128 /* Rule 8: Use longest matching prefix */
1129 if (hiscore.rule < 8) {
1130 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1131 hiscore.rule++;
1132 }
1133 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1134 if (score.matchlen > hiscore.matchlen) {
1135 score.rule = 8;
1136 goto record_it;
1137 }
1138 #if 0
1139 else if (score.matchlen < hiscore.matchlen)
1140 continue;
1141 #endif
1142
1143 /* Final Rule: choose first available one */
1144 continue;
1145 record_it:
1146 if (ifa_result)
1147 in6_ifa_put(ifa_result);
1148 in6_ifa_hold(ifa);
1149 ifa_result = ifa;
1150 hiscore = score;
1151 }
1152 read_unlock_bh(&idev->lock);
1153 }
1154 rcu_read_unlock();
1155 read_unlock(&dev_base_lock);
1156
1157 if (!ifa_result)
1158 return -EADDRNOTAVAIL;
1159
1160 ipv6_addr_copy(saddr, &ifa_result->addr);
1161 in6_ifa_put(ifa_result);
1162 return 0;
1163 }
1164
1165
1166 int ipv6_get_saddr(struct dst_entry *dst,
1167 struct in6_addr *daddr, struct in6_addr *saddr)
1168 {
1169 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1170 }
1171
1172 EXPORT_SYMBOL(ipv6_get_saddr);
1173
1174 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1175 unsigned char banned_flags)
1176 {
1177 struct inet6_dev *idev;
1178 int err = -EADDRNOTAVAIL;
1179
1180 rcu_read_lock();
1181 if ((idev = __in6_dev_get(dev)) != NULL) {
1182 struct inet6_ifaddr *ifp;
1183
1184 read_lock_bh(&idev->lock);
1185 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1186 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1187 ipv6_addr_copy(addr, &ifp->addr);
1188 err = 0;
1189 break;
1190 }
1191 }
1192 read_unlock_bh(&idev->lock);
1193 }
1194 rcu_read_unlock();
1195 return err;
1196 }
1197
1198 static int ipv6_count_addresses(struct inet6_dev *idev)
1199 {
1200 int cnt = 0;
1201 struct inet6_ifaddr *ifp;
1202
1203 read_lock_bh(&idev->lock);
1204 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1205 cnt++;
1206 read_unlock_bh(&idev->lock);
1207 return cnt;
1208 }
1209
1210 int ipv6_chk_addr(struct in6_addr *addr, 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 (ipv6_addr_equal(&ifp->addr, addr) &&
1218 !(ifp->flags&IFA_F_TENTATIVE)) {
1219 if (dev == NULL || ifp->idev->dev == dev ||
1220 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1221 break;
1222 }
1223 }
1224 read_unlock_bh(&addrconf_hash_lock);
1225 return ifp != NULL;
1226 }
1227
1228 EXPORT_SYMBOL(ipv6_chk_addr);
1229
1230 static
1231 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1232 {
1233 struct inet6_ifaddr * ifp;
1234 u8 hash = ipv6_addr_hash(addr);
1235
1236 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1237 if (ipv6_addr_equal(&ifp->addr, addr)) {
1238 if (dev == NULL || ifp->idev->dev == dev)
1239 break;
1240 }
1241 }
1242 return ifp != NULL;
1243 }
1244
1245 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1246 {
1247 struct inet6_ifaddr * ifp;
1248 u8 hash = ipv6_addr_hash(addr);
1249
1250 read_lock_bh(&addrconf_hash_lock);
1251 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1252 if (ipv6_addr_equal(&ifp->addr, addr)) {
1253 if (dev == NULL || ifp->idev->dev == dev ||
1254 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1255 in6_ifa_hold(ifp);
1256 break;
1257 }
1258 }
1259 }
1260 read_unlock_bh(&addrconf_hash_lock);
1261
1262 return ifp;
1263 }
1264
1265 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1266 {
1267 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1268 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1269 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1270 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1271 int sk_ipv6only = ipv6_only_sock(sk);
1272 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1273 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1274 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1275
1276 if (!sk2_rcv_saddr && !sk_ipv6only)
1277 return 1;
1278
1279 if (addr_type2 == IPV6_ADDR_ANY &&
1280 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1281 return 1;
1282
1283 if (addr_type == IPV6_ADDR_ANY &&
1284 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1285 return 1;
1286
1287 if (sk2_rcv_saddr6 &&
1288 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1289 return 1;
1290
1291 if (addr_type == IPV6_ADDR_MAPPED &&
1292 !sk2_ipv6only &&
1293 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1294 return 1;
1295
1296 return 0;
1297 }
1298
1299 /* Gets referenced address, destroys ifaddr */
1300
1301 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1302 {
1303 if (ifp->flags&IFA_F_PERMANENT) {
1304 spin_lock_bh(&ifp->lock);
1305 addrconf_del_timer(ifp);
1306 ifp->flags |= IFA_F_TENTATIVE;
1307 spin_unlock_bh(&ifp->lock);
1308 in6_ifa_put(ifp);
1309 #ifdef CONFIG_IPV6_PRIVACY
1310 } else if (ifp->flags&IFA_F_TEMPORARY) {
1311 struct inet6_ifaddr *ifpub;
1312 spin_lock_bh(&ifp->lock);
1313 ifpub = ifp->ifpub;
1314 if (ifpub) {
1315 in6_ifa_hold(ifpub);
1316 spin_unlock_bh(&ifp->lock);
1317 ipv6_create_tempaddr(ifpub, ifp);
1318 in6_ifa_put(ifpub);
1319 } else {
1320 spin_unlock_bh(&ifp->lock);
1321 }
1322 ipv6_del_addr(ifp);
1323 #endif
1324 } else
1325 ipv6_del_addr(ifp);
1326 }
1327
1328 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1329 {
1330 if (net_ratelimit())
1331 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1332 addrconf_dad_stop(ifp);
1333 }
1334
1335 /* Join to solicited addr multicast group. */
1336
1337 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1338 {
1339 struct in6_addr maddr;
1340
1341 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1342 return;
1343
1344 addrconf_addr_solict_mult(addr, &maddr);
1345 ipv6_dev_mc_inc(dev, &maddr);
1346 }
1347
1348 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1349 {
1350 struct in6_addr maddr;
1351
1352 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1353 return;
1354
1355 addrconf_addr_solict_mult(addr, &maddr);
1356 __ipv6_dev_mc_dec(idev, &maddr);
1357 }
1358
1359 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1360 {
1361 struct in6_addr addr;
1362 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1363 if (ipv6_addr_any(&addr))
1364 return;
1365 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1366 }
1367
1368 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1369 {
1370 struct in6_addr addr;
1371 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1372 if (ipv6_addr_any(&addr))
1373 return;
1374 __ipv6_dev_ac_dec(ifp->idev, &addr);
1375 }
1376
1377 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1378 {
1379 if (dev->addr_len != ETH_ALEN)
1380 return -1;
1381 memcpy(eui, dev->dev_addr, 3);
1382 memcpy(eui + 5, dev->dev_addr + 3, 3);
1383
1384 /*
1385 * The zSeries OSA network cards can be shared among various
1386 * OS instances, but the OSA cards have only one MAC address.
1387 * This leads to duplicate address conflicts in conjunction
1388 * with IPv6 if more than one instance uses the same card.
1389 *
1390 * The driver for these cards can deliver a unique 16-bit
1391 * identifier for each instance sharing the same card. It is
1392 * placed instead of 0xFFFE in the interface identifier. The
1393 * "u" bit of the interface identifier is not inverted in this
1394 * case. Hence the resulting interface identifier has local
1395 * scope according to RFC2373.
1396 */
1397 if (dev->dev_id) {
1398 eui[3] = (dev->dev_id >> 8) & 0xFF;
1399 eui[4] = dev->dev_id & 0xFF;
1400 } else {
1401 eui[3] = 0xFF;
1402 eui[4] = 0xFE;
1403 eui[0] ^= 2;
1404 }
1405 return 0;
1406 }
1407
1408 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1409 {
1410 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1411 if (dev->addr_len != ARCNET_ALEN)
1412 return -1;
1413 memset(eui, 0, 7);
1414 eui[7] = *(u8*)dev->dev_addr;
1415 return 0;
1416 }
1417
1418 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1419 {
1420 if (dev->addr_len != INFINIBAND_ALEN)
1421 return -1;
1422 memcpy(eui, dev->dev_addr + 12, 8);
1423 eui[0] |= 2;
1424 return 0;
1425 }
1426
1427 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1428 {
1429 switch (dev->type) {
1430 case ARPHRD_ETHER:
1431 case ARPHRD_FDDI:
1432 case ARPHRD_IEEE802_TR:
1433 return addrconf_ifid_eui48(eui, dev);
1434 case ARPHRD_ARCNET:
1435 return addrconf_ifid_arcnet(eui, dev);
1436 case ARPHRD_INFINIBAND:
1437 return addrconf_ifid_infiniband(eui, dev);
1438 }
1439 return -1;
1440 }
1441
1442 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1443 {
1444 int err = -1;
1445 struct inet6_ifaddr *ifp;
1446
1447 read_lock_bh(&idev->lock);
1448 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1449 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1450 memcpy(eui, ifp->addr.s6_addr+8, 8);
1451 err = 0;
1452 break;
1453 }
1454 }
1455 read_unlock_bh(&idev->lock);
1456 return err;
1457 }
1458
1459 #ifdef CONFIG_IPV6_PRIVACY
1460 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1461 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1462 {
1463 regen:
1464 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1465 idev->rndid[0] &= ~0x02;
1466
1467 /*
1468 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1469 * check if generated address is not inappropriate
1470 *
1471 * - Reserved subnet anycast (RFC 2526)
1472 * 11111101 11....11 1xxxxxxx
1473 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1474 * 00-00-5E-FE-xx-xx-xx-xx
1475 * - value 0
1476 * - XXX: already assigned to an address on the device
1477 */
1478 if (idev->rndid[0] == 0xfd &&
1479 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1480 (idev->rndid[7]&0x80))
1481 goto regen;
1482 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1483 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1484 goto regen;
1485 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1486 goto regen;
1487 }
1488
1489 return 0;
1490 }
1491
1492 static void ipv6_regen_rndid(unsigned long data)
1493 {
1494 struct inet6_dev *idev = (struct inet6_dev *) data;
1495 unsigned long expires;
1496
1497 rcu_read_lock_bh();
1498 write_lock_bh(&idev->lock);
1499
1500 if (idev->dead)
1501 goto out;
1502
1503 if (__ipv6_regen_rndid(idev) < 0)
1504 goto out;
1505
1506 expires = jiffies +
1507 idev->cnf.temp_prefered_lft * HZ -
1508 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1509 if (time_before(expires, jiffies)) {
1510 printk(KERN_WARNING
1511 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1512 idev->dev->name);
1513 goto out;
1514 }
1515
1516 if (!mod_timer(&idev->regen_timer, expires))
1517 in6_dev_hold(idev);
1518
1519 out:
1520 write_unlock_bh(&idev->lock);
1521 rcu_read_unlock_bh();
1522 in6_dev_put(idev);
1523 }
1524
1525 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1526 int ret = 0;
1527
1528 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1529 ret = __ipv6_regen_rndid(idev);
1530 return ret;
1531 }
1532 #endif
1533
1534 /*
1535 * Add prefix route.
1536 */
1537
1538 static void
1539 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1540 unsigned long expires, u32 flags)
1541 {
1542 struct fib6_config cfg = {
1543 .fc_table = RT6_TABLE_PREFIX,
1544 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1545 .fc_ifindex = dev->ifindex,
1546 .fc_expires = expires,
1547 .fc_dst_len = plen,
1548 .fc_flags = RTF_UP | flags,
1549 };
1550
1551 ipv6_addr_copy(&cfg.fc_dst, pfx);
1552
1553 /* Prevent useless cloning on PtP SIT.
1554 This thing is done here expecting that the whole
1555 class of non-broadcast devices need not cloning.
1556 */
1557 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1558 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1559 cfg.fc_flags |= RTF_NONEXTHOP;
1560 #endif
1561
1562 ip6_route_add(&cfg);
1563 }
1564
1565 /* Create "default" multicast route to the interface */
1566
1567 static void addrconf_add_mroute(struct net_device *dev)
1568 {
1569 struct fib6_config cfg = {
1570 .fc_table = RT6_TABLE_LOCAL,
1571 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1572 .fc_ifindex = dev->ifindex,
1573 .fc_dst_len = 8,
1574 .fc_flags = RTF_UP,
1575 };
1576
1577 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1578
1579 ip6_route_add(&cfg);
1580 }
1581
1582 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1583 static void sit_route_add(struct net_device *dev)
1584 {
1585 struct fib6_config cfg = {
1586 .fc_table = RT6_TABLE_MAIN,
1587 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1588 .fc_ifindex = dev->ifindex,
1589 .fc_dst_len = 96,
1590 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1591 };
1592
1593 /* prefix length - 96 bits "::d.d.d.d" */
1594 ip6_route_add(&cfg);
1595 }
1596 #endif
1597
1598 static void addrconf_add_lroute(struct net_device *dev)
1599 {
1600 struct in6_addr addr;
1601
1602 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1603 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1604 }
1605
1606 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1607 {
1608 struct inet6_dev *idev;
1609
1610 ASSERT_RTNL();
1611
1612 if ((idev = ipv6_find_idev(dev)) == NULL)
1613 return NULL;
1614
1615 /* Add default multicast route */
1616 addrconf_add_mroute(dev);
1617
1618 /* Add link local route */
1619 addrconf_add_lroute(dev);
1620 return idev;
1621 }
1622
1623 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1624 {
1625 struct prefix_info *pinfo;
1626 __u32 valid_lft;
1627 __u32 prefered_lft;
1628 int addr_type;
1629 unsigned long rt_expires;
1630 struct inet6_dev *in6_dev;
1631
1632 pinfo = (struct prefix_info *) opt;
1633
1634 if (len < sizeof(struct prefix_info)) {
1635 ADBG(("addrconf: prefix option too short\n"));
1636 return;
1637 }
1638
1639 /*
1640 * Validation checks ([ADDRCONF], page 19)
1641 */
1642
1643 addr_type = ipv6_addr_type(&pinfo->prefix);
1644
1645 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1646 return;
1647
1648 valid_lft = ntohl(pinfo->valid);
1649 prefered_lft = ntohl(pinfo->prefered);
1650
1651 if (prefered_lft > valid_lft) {
1652 if (net_ratelimit())
1653 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1654 return;
1655 }
1656
1657 in6_dev = in6_dev_get(dev);
1658
1659 if (in6_dev == NULL) {
1660 if (net_ratelimit())
1661 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1662 return;
1663 }
1664
1665 /*
1666 * Two things going on here:
1667 * 1) Add routes for on-link prefixes
1668 * 2) Configure prefixes with the auto flag set
1669 */
1670
1671 /* Avoid arithmetic overflow. Really, we could
1672 save rt_expires in seconds, likely valid_lft,
1673 but it would require division in fib gc, that it
1674 not good.
1675 */
1676 if (valid_lft >= 0x7FFFFFFF/HZ)
1677 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1678 else
1679 rt_expires = valid_lft * HZ;
1680
1681 /*
1682 * We convert this (in jiffies) to clock_t later.
1683 * Avoid arithmetic overflow there as well.
1684 * Overflow can happen only if HZ < USER_HZ.
1685 */
1686 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1687 rt_expires = 0x7FFFFFFF / USER_HZ;
1688
1689 if (pinfo->onlink) {
1690 struct rt6_info *rt;
1691 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1692
1693 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1694 if (rt->rt6i_flags&RTF_EXPIRES) {
1695 if (valid_lft == 0) {
1696 ip6_del_rt(rt);
1697 rt = NULL;
1698 } else {
1699 rt->rt6i_expires = jiffies + rt_expires;
1700 }
1701 }
1702 } else if (valid_lft) {
1703 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1704 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1705 }
1706 if (rt)
1707 dst_release(&rt->u.dst);
1708 }
1709
1710 /* Try to figure out our local address for this prefix */
1711
1712 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1713 struct inet6_ifaddr * ifp;
1714 struct in6_addr addr;
1715 int create = 0, update_lft = 0;
1716
1717 if (pinfo->prefix_len == 64) {
1718 memcpy(&addr, &pinfo->prefix, 8);
1719 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1720 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1721 in6_dev_put(in6_dev);
1722 return;
1723 }
1724 goto ok;
1725 }
1726 if (net_ratelimit())
1727 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1728 pinfo->prefix_len);
1729 in6_dev_put(in6_dev);
1730 return;
1731
1732 ok:
1733
1734 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1735
1736 if (ifp == NULL && valid_lft) {
1737 int max_addresses = in6_dev->cnf.max_addresses;
1738 u32 addr_flags = 0;
1739
1740 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1741 if (in6_dev->cnf.optimistic_dad &&
1742 !ipv6_devconf.forwarding)
1743 addr_flags = IFA_F_OPTIMISTIC;
1744 #endif
1745
1746 /* Do not allow to create too much of autoconfigured
1747 * addresses; this would be too easy way to crash kernel.
1748 */
1749 if (!max_addresses ||
1750 ipv6_count_addresses(in6_dev) < max_addresses)
1751 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1752 addr_type&IPV6_ADDR_SCOPE_MASK,
1753 addr_flags);
1754
1755 if (!ifp || IS_ERR(ifp)) {
1756 in6_dev_put(in6_dev);
1757 return;
1758 }
1759
1760 update_lft = create = 1;
1761 ifp->cstamp = jiffies;
1762 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1763 }
1764
1765 if (ifp) {
1766 int flags;
1767 unsigned long now;
1768 #ifdef CONFIG_IPV6_PRIVACY
1769 struct inet6_ifaddr *ift;
1770 #endif
1771 u32 stored_lft;
1772
1773 /* update lifetime (RFC2462 5.5.3 e) */
1774 spin_lock(&ifp->lock);
1775 now = jiffies;
1776 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1777 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1778 else
1779 stored_lft = 0;
1780 if (!update_lft && stored_lft) {
1781 if (valid_lft > MIN_VALID_LIFETIME ||
1782 valid_lft > stored_lft)
1783 update_lft = 1;
1784 else if (stored_lft <= MIN_VALID_LIFETIME) {
1785 /* valid_lft <= stored_lft is always true */
1786 /* XXX: IPsec */
1787 update_lft = 0;
1788 } else {
1789 valid_lft = MIN_VALID_LIFETIME;
1790 if (valid_lft < prefered_lft)
1791 prefered_lft = valid_lft;
1792 update_lft = 1;
1793 }
1794 }
1795
1796 if (update_lft) {
1797 ifp->valid_lft = valid_lft;
1798 ifp->prefered_lft = prefered_lft;
1799 ifp->tstamp = now;
1800 flags = ifp->flags;
1801 ifp->flags &= ~IFA_F_DEPRECATED;
1802 spin_unlock(&ifp->lock);
1803
1804 if (!(flags&IFA_F_TENTATIVE))
1805 ipv6_ifa_notify(0, ifp);
1806 } else
1807 spin_unlock(&ifp->lock);
1808
1809 #ifdef CONFIG_IPV6_PRIVACY
1810 read_lock_bh(&in6_dev->lock);
1811 /* update all temporary addresses in the list */
1812 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1813 /*
1814 * When adjusting the lifetimes of an existing
1815 * temporary address, only lower the lifetimes.
1816 * Implementations must not increase the
1817 * lifetimes of an existing temporary address
1818 * when processing a Prefix Information Option.
1819 */
1820 spin_lock(&ift->lock);
1821 flags = ift->flags;
1822 if (ift->valid_lft > valid_lft &&
1823 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1824 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1825 if (ift->prefered_lft > prefered_lft &&
1826 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1827 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1828 spin_unlock(&ift->lock);
1829 if (!(flags&IFA_F_TENTATIVE))
1830 ipv6_ifa_notify(0, ift);
1831 }
1832
1833 if (create && in6_dev->cnf.use_tempaddr > 0) {
1834 /*
1835 * When a new public address is created as described in [ADDRCONF],
1836 * also create a new temporary address.
1837 */
1838 read_unlock_bh(&in6_dev->lock);
1839 ipv6_create_tempaddr(ifp, NULL);
1840 } else {
1841 read_unlock_bh(&in6_dev->lock);
1842 }
1843 #endif
1844 in6_ifa_put(ifp);
1845 addrconf_verify(0);
1846 }
1847 }
1848 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1849 in6_dev_put(in6_dev);
1850 }
1851
1852 /*
1853 * Set destination address.
1854 * Special case for SIT interfaces where we create a new "virtual"
1855 * device.
1856 */
1857 int addrconf_set_dstaddr(void __user *arg)
1858 {
1859 struct in6_ifreq ireq;
1860 struct net_device *dev;
1861 int err = -EINVAL;
1862
1863 rtnl_lock();
1864
1865 err = -EFAULT;
1866 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1867 goto err_exit;
1868
1869 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1870
1871 err = -ENODEV;
1872 if (dev == NULL)
1873 goto err_exit;
1874
1875 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1876 if (dev->type == ARPHRD_SIT) {
1877 struct ifreq ifr;
1878 mm_segment_t oldfs;
1879 struct ip_tunnel_parm p;
1880
1881 err = -EADDRNOTAVAIL;
1882 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1883 goto err_exit;
1884
1885 memset(&p, 0, sizeof(p));
1886 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1887 p.iph.saddr = 0;
1888 p.iph.version = 4;
1889 p.iph.ihl = 5;
1890 p.iph.protocol = IPPROTO_IPV6;
1891 p.iph.ttl = 64;
1892 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1893
1894 oldfs = get_fs(); set_fs(KERNEL_DS);
1895 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1896 set_fs(oldfs);
1897
1898 if (err == 0) {
1899 err = -ENOBUFS;
1900 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1901 goto err_exit;
1902 err = dev_open(dev);
1903 }
1904 }
1905 #endif
1906
1907 err_exit:
1908 rtnl_unlock();
1909 return err;
1910 }
1911
1912 /*
1913 * Manual configuration of address on an interface
1914 */
1915 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1916 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1917 {
1918 struct inet6_ifaddr *ifp;
1919 struct inet6_dev *idev;
1920 struct net_device *dev;
1921 int scope;
1922 u32 flags = RTF_EXPIRES;
1923
1924 ASSERT_RTNL();
1925
1926 /* check the lifetime */
1927 if (!valid_lft || prefered_lft > valid_lft)
1928 return -EINVAL;
1929
1930 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1931 return -ENODEV;
1932
1933 if ((idev = addrconf_add_dev(dev)) == NULL)
1934 return -ENOBUFS;
1935
1936 scope = ipv6_addr_scope(pfx);
1937
1938 if (valid_lft == INFINITY_LIFE_TIME) {
1939 ifa_flags |= IFA_F_PERMANENT;
1940 flags = 0;
1941 } else if (valid_lft >= 0x7FFFFFFF/HZ)
1942 valid_lft = 0x7FFFFFFF/HZ;
1943
1944 if (prefered_lft == 0)
1945 ifa_flags |= IFA_F_DEPRECATED;
1946 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1947 (prefered_lft != INFINITY_LIFE_TIME))
1948 prefered_lft = 0x7FFFFFFF/HZ;
1949
1950 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1951
1952 if (!IS_ERR(ifp)) {
1953 spin_lock_bh(&ifp->lock);
1954 ifp->valid_lft = valid_lft;
1955 ifp->prefered_lft = prefered_lft;
1956 ifp->tstamp = jiffies;
1957 spin_unlock_bh(&ifp->lock);
1958
1959 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1960 jiffies_to_clock_t(valid_lft * HZ), flags);
1961 /*
1962 * Note that section 3.1 of RFC 4429 indicates
1963 * that the Optimistic flag should not be set for
1964 * manually configured addresses
1965 */
1966 addrconf_dad_start(ifp, 0);
1967 in6_ifa_put(ifp);
1968 addrconf_verify(0);
1969 return 0;
1970 }
1971
1972 return PTR_ERR(ifp);
1973 }
1974
1975 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1976 {
1977 struct inet6_ifaddr *ifp;
1978 struct inet6_dev *idev;
1979 struct net_device *dev;
1980
1981 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1982 return -ENODEV;
1983
1984 if ((idev = __in6_dev_get(dev)) == NULL)
1985 return -ENXIO;
1986
1987 read_lock_bh(&idev->lock);
1988 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1989 if (ifp->prefix_len == plen &&
1990 ipv6_addr_equal(pfx, &ifp->addr)) {
1991 in6_ifa_hold(ifp);
1992 read_unlock_bh(&idev->lock);
1993
1994 ipv6_del_addr(ifp);
1995
1996 /* If the last address is deleted administratively,
1997 disable IPv6 on this interface.
1998 */
1999 if (idev->addr_list == NULL)
2000 addrconf_ifdown(idev->dev, 1);
2001 return 0;
2002 }
2003 }
2004 read_unlock_bh(&idev->lock);
2005 return -EADDRNOTAVAIL;
2006 }
2007
2008
2009 int addrconf_add_ifaddr(void __user *arg)
2010 {
2011 struct in6_ifreq ireq;
2012 int err;
2013
2014 if (!capable(CAP_NET_ADMIN))
2015 return -EPERM;
2016
2017 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2018 return -EFAULT;
2019
2020 rtnl_lock();
2021 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2022 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2023 rtnl_unlock();
2024 return err;
2025 }
2026
2027 int addrconf_del_ifaddr(void __user *arg)
2028 {
2029 struct in6_ifreq ireq;
2030 int err;
2031
2032 if (!capable(CAP_NET_ADMIN))
2033 return -EPERM;
2034
2035 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2036 return -EFAULT;
2037
2038 rtnl_lock();
2039 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2040 rtnl_unlock();
2041 return err;
2042 }
2043
2044 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2045 static void sit_add_v4_addrs(struct inet6_dev *idev)
2046 {
2047 struct inet6_ifaddr * ifp;
2048 struct in6_addr addr;
2049 struct net_device *dev;
2050 int scope;
2051
2052 ASSERT_RTNL();
2053
2054 memset(&addr, 0, sizeof(struct in6_addr));
2055 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2056
2057 if (idev->dev->flags&IFF_POINTOPOINT) {
2058 addr.s6_addr32[0] = htonl(0xfe800000);
2059 scope = IFA_LINK;
2060 } else {
2061 scope = IPV6_ADDR_COMPATv4;
2062 }
2063
2064 if (addr.s6_addr32[3]) {
2065 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2066 if (!IS_ERR(ifp)) {
2067 spin_lock_bh(&ifp->lock);
2068 ifp->flags &= ~IFA_F_TENTATIVE;
2069 spin_unlock_bh(&ifp->lock);
2070 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2071 in6_ifa_put(ifp);
2072 }
2073 return;
2074 }
2075
2076 for_each_netdev(&init_net, dev) {
2077 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2078 if (in_dev && (dev->flags & IFF_UP)) {
2079 struct in_ifaddr * ifa;
2080
2081 int flag = scope;
2082
2083 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2084 int plen;
2085
2086 addr.s6_addr32[3] = ifa->ifa_local;
2087
2088 if (ifa->ifa_scope == RT_SCOPE_LINK)
2089 continue;
2090 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2091 if (idev->dev->flags&IFF_POINTOPOINT)
2092 continue;
2093 flag |= IFA_HOST;
2094 }
2095 if (idev->dev->flags&IFF_POINTOPOINT)
2096 plen = 64;
2097 else
2098 plen = 96;
2099
2100 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2101 IFA_F_PERMANENT);
2102 if (!IS_ERR(ifp)) {
2103 spin_lock_bh(&ifp->lock);
2104 ifp->flags &= ~IFA_F_TENTATIVE;
2105 spin_unlock_bh(&ifp->lock);
2106 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2107 in6_ifa_put(ifp);
2108 }
2109 }
2110 }
2111 }
2112 }
2113 #endif
2114
2115 static void init_loopback(struct net_device *dev)
2116 {
2117 struct inet6_dev *idev;
2118 struct inet6_ifaddr * ifp;
2119
2120 /* ::1 */
2121
2122 ASSERT_RTNL();
2123
2124 if ((idev = ipv6_find_idev(dev)) == NULL) {
2125 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2126 return;
2127 }
2128
2129 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2130 if (!IS_ERR(ifp)) {
2131 spin_lock_bh(&ifp->lock);
2132 ifp->flags &= ~IFA_F_TENTATIVE;
2133 spin_unlock_bh(&ifp->lock);
2134 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2135 in6_ifa_put(ifp);
2136 }
2137 }
2138
2139 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2140 {
2141 struct inet6_ifaddr * ifp;
2142 u32 addr_flags = IFA_F_PERMANENT;
2143
2144 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2145 if (idev->cnf.optimistic_dad &&
2146 !ipv6_devconf.forwarding)
2147 addr_flags |= IFA_F_OPTIMISTIC;
2148 #endif
2149
2150
2151 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2152 if (!IS_ERR(ifp)) {
2153 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2154 addrconf_dad_start(ifp, 0);
2155 in6_ifa_put(ifp);
2156 }
2157 }
2158
2159 static void addrconf_dev_config(struct net_device *dev)
2160 {
2161 struct in6_addr addr;
2162 struct inet6_dev * idev;
2163
2164 ASSERT_RTNL();
2165
2166 if ((dev->type != ARPHRD_ETHER) &&
2167 (dev->type != ARPHRD_FDDI) &&
2168 (dev->type != ARPHRD_IEEE802_TR) &&
2169 (dev->type != ARPHRD_ARCNET) &&
2170 (dev->type != ARPHRD_INFINIBAND)) {
2171 /* Alas, we support only Ethernet autoconfiguration. */
2172 return;
2173 }
2174
2175 idev = addrconf_add_dev(dev);
2176 if (idev == NULL)
2177 return;
2178
2179 memset(&addr, 0, sizeof(struct in6_addr));
2180 addr.s6_addr32[0] = htonl(0xFE800000);
2181
2182 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2183 addrconf_add_linklocal(idev, &addr);
2184 }
2185
2186 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2187 static void addrconf_sit_config(struct net_device *dev)
2188 {
2189 struct inet6_dev *idev;
2190
2191 ASSERT_RTNL();
2192
2193 /*
2194 * Configure the tunnel with one of our IPv4
2195 * addresses... we should configure all of
2196 * our v4 addrs in the tunnel
2197 */
2198
2199 if ((idev = ipv6_find_idev(dev)) == NULL) {
2200 printk(KERN_DEBUG "init sit: add_dev failed\n");
2201 return;
2202 }
2203
2204 sit_add_v4_addrs(idev);
2205
2206 if (dev->flags&IFF_POINTOPOINT) {
2207 addrconf_add_mroute(dev);
2208 addrconf_add_lroute(dev);
2209 } else
2210 sit_route_add(dev);
2211 }
2212 #endif
2213
2214 static inline int
2215 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2216 {
2217 struct in6_addr lladdr;
2218
2219 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2220 addrconf_add_linklocal(idev, &lladdr);
2221 return 0;
2222 }
2223 return -1;
2224 }
2225
2226 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2227 {
2228 struct net_device *link_dev;
2229
2230 /* first try to inherit the link-local address from the link device */
2231 if (idev->dev->iflink &&
2232 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2233 if (!ipv6_inherit_linklocal(idev, link_dev))
2234 return;
2235 }
2236 /* then try to inherit it from any device */
2237 for_each_netdev(&init_net, link_dev) {
2238 if (!ipv6_inherit_linklocal(idev, link_dev))
2239 return;
2240 }
2241 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2242 }
2243
2244 /*
2245 * Autoconfigure tunnel with a link-local address so routing protocols,
2246 * DHCPv6, MLD etc. can be run over the virtual link
2247 */
2248
2249 static void addrconf_ip6_tnl_config(struct net_device *dev)
2250 {
2251 struct inet6_dev *idev;
2252
2253 ASSERT_RTNL();
2254
2255 if ((idev = addrconf_add_dev(dev)) == NULL) {
2256 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2257 return;
2258 }
2259 ip6_tnl_add_linklocal(idev);
2260 }
2261
2262 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2263 void * data)
2264 {
2265 struct net_device *dev = (struct net_device *) data;
2266 struct inet6_dev *idev = __in6_dev_get(dev);
2267 int run_pending = 0;
2268 int err;
2269
2270 if (dev->nd_net != &init_net)
2271 return NOTIFY_DONE;
2272
2273 switch(event) {
2274 case NETDEV_REGISTER:
2275 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2276 idev = ipv6_add_dev(dev);
2277 if (!idev)
2278 return notifier_from_errno(-ENOMEM);
2279 }
2280 break;
2281 case NETDEV_UP:
2282 case NETDEV_CHANGE:
2283 if (dev->flags & IFF_SLAVE)
2284 break;
2285
2286 if (event == NETDEV_UP) {
2287 if (!addrconf_qdisc_ok(dev)) {
2288 /* device is not ready yet. */
2289 printk(KERN_INFO
2290 "ADDRCONF(NETDEV_UP): %s: "
2291 "link is not ready\n",
2292 dev->name);
2293 break;
2294 }
2295
2296 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2297 idev = ipv6_add_dev(dev);
2298
2299 if (idev)
2300 idev->if_flags |= IF_READY;
2301 } else {
2302 if (!addrconf_qdisc_ok(dev)) {
2303 /* device is still not ready. */
2304 break;
2305 }
2306
2307 if (idev) {
2308 if (idev->if_flags & IF_READY) {
2309 /* device is already configured. */
2310 break;
2311 }
2312 idev->if_flags |= IF_READY;
2313 }
2314
2315 printk(KERN_INFO
2316 "ADDRCONF(NETDEV_CHANGE): %s: "
2317 "link becomes ready\n",
2318 dev->name);
2319
2320 run_pending = 1;
2321 }
2322
2323 switch(dev->type) {
2324 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2325 case ARPHRD_SIT:
2326 addrconf_sit_config(dev);
2327 break;
2328 #endif
2329 case ARPHRD_TUNNEL6:
2330 addrconf_ip6_tnl_config(dev);
2331 break;
2332 case ARPHRD_LOOPBACK:
2333 init_loopback(dev);
2334 break;
2335
2336 default:
2337 addrconf_dev_config(dev);
2338 break;
2339 }
2340 if (idev) {
2341 if (run_pending)
2342 addrconf_dad_run(idev);
2343
2344 /* If the MTU changed during the interface down, when the
2345 interface up, the changed MTU must be reflected in the
2346 idev as well as routers.
2347 */
2348 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2349 rt6_mtu_change(dev, dev->mtu);
2350 idev->cnf.mtu6 = dev->mtu;
2351 }
2352 idev->tstamp = jiffies;
2353 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2354 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2355 stop IPv6 on this interface.
2356 */
2357 if (dev->mtu < IPV6_MIN_MTU)
2358 addrconf_ifdown(dev, event != NETDEV_DOWN);
2359 }
2360 break;
2361
2362 case NETDEV_CHANGEMTU:
2363 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2364 rt6_mtu_change(dev, dev->mtu);
2365 idev->cnf.mtu6 = dev->mtu;
2366 break;
2367 }
2368
2369 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2370 idev = ipv6_add_dev(dev);
2371 if (idev)
2372 break;
2373 }
2374
2375 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2376
2377 case NETDEV_DOWN:
2378 case NETDEV_UNREGISTER:
2379 /*
2380 * Remove all addresses from this interface.
2381 */
2382 addrconf_ifdown(dev, event != NETDEV_DOWN);
2383 break;
2384
2385 case NETDEV_CHANGENAME:
2386 if (idev) {
2387 snmp6_unregister_dev(idev);
2388 #ifdef CONFIG_SYSCTL
2389 addrconf_sysctl_unregister(&idev->cnf);
2390 neigh_sysctl_unregister(idev->nd_parms);
2391 neigh_sysctl_register(dev, idev->nd_parms,
2392 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2393 &ndisc_ifinfo_sysctl_change,
2394 NULL);
2395 addrconf_sysctl_register(idev, &idev->cnf);
2396 #endif
2397 err = snmp6_register_dev(idev);
2398 if (err)
2399 return notifier_from_errno(err);
2400 }
2401 break;
2402 }
2403
2404 return NOTIFY_OK;
2405 }
2406
2407 /*
2408 * addrconf module should be notified of a device going up
2409 */
2410 static struct notifier_block ipv6_dev_notf = {
2411 .notifier_call = addrconf_notify,
2412 .priority = 0
2413 };
2414
2415 static int addrconf_ifdown(struct net_device *dev, int how)
2416 {
2417 struct inet6_dev *idev;
2418 struct inet6_ifaddr *ifa, **bifa;
2419 int i;
2420
2421 ASSERT_RTNL();
2422
2423 if (dev == init_net.loopback_dev && how == 1)
2424 how = 0;
2425
2426 rt6_ifdown(dev);
2427 neigh_ifdown(&nd_tbl, dev);
2428
2429 idev = __in6_dev_get(dev);
2430 if (idev == NULL)
2431 return -ENODEV;
2432
2433 /* Step 1: remove reference to ipv6 device from parent device.
2434 Do not dev_put!
2435 */
2436 if (how == 1) {
2437 idev->dead = 1;
2438
2439 /* protected by rtnl_lock */
2440 rcu_assign_pointer(dev->ip6_ptr, NULL);
2441
2442 /* Step 1.5: remove snmp6 entry */
2443 snmp6_unregister_dev(idev);
2444
2445 }
2446
2447 /* Step 2: clear hash table */
2448 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2449 bifa = &inet6_addr_lst[i];
2450
2451 write_lock_bh(&addrconf_hash_lock);
2452 while ((ifa = *bifa) != NULL) {
2453 if (ifa->idev == idev) {
2454 *bifa = ifa->lst_next;
2455 ifa->lst_next = NULL;
2456 addrconf_del_timer(ifa);
2457 in6_ifa_put(ifa);
2458 continue;
2459 }
2460 bifa = &ifa->lst_next;
2461 }
2462 write_unlock_bh(&addrconf_hash_lock);
2463 }
2464
2465 write_lock_bh(&idev->lock);
2466
2467 /* Step 3: clear flags for stateless addrconf */
2468 if (how != 1)
2469 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2470
2471 /* Step 4: clear address list */
2472 #ifdef CONFIG_IPV6_PRIVACY
2473 if (how == 1 && del_timer(&idev->regen_timer))
2474 in6_dev_put(idev);
2475
2476 /* clear tempaddr list */
2477 while ((ifa = idev->tempaddr_list) != NULL) {
2478 idev->tempaddr_list = ifa->tmp_next;
2479 ifa->tmp_next = NULL;
2480 ifa->dead = 1;
2481 write_unlock_bh(&idev->lock);
2482 spin_lock_bh(&ifa->lock);
2483
2484 if (ifa->ifpub) {
2485 in6_ifa_put(ifa->ifpub);
2486 ifa->ifpub = NULL;
2487 }
2488 spin_unlock_bh(&ifa->lock);
2489 in6_ifa_put(ifa);
2490 write_lock_bh(&idev->lock);
2491 }
2492 #endif
2493 while ((ifa = idev->addr_list) != NULL) {
2494 idev->addr_list = ifa->if_next;
2495 ifa->if_next = NULL;
2496 ifa->dead = 1;
2497 addrconf_del_timer(ifa);
2498 write_unlock_bh(&idev->lock);
2499
2500 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2501 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2502 in6_ifa_put(ifa);
2503
2504 write_lock_bh(&idev->lock);
2505 }
2506 write_unlock_bh(&idev->lock);
2507
2508 /* Step 5: Discard multicast list */
2509
2510 if (how == 1)
2511 ipv6_mc_destroy_dev(idev);
2512 else
2513 ipv6_mc_down(idev);
2514
2515 idev->tstamp = jiffies;
2516
2517 /* Shot the device (if unregistered) */
2518
2519 if (how == 1) {
2520 #ifdef CONFIG_SYSCTL
2521 addrconf_sysctl_unregister(&idev->cnf);
2522 neigh_sysctl_unregister(idev->nd_parms);
2523 #endif
2524 neigh_parms_release(&nd_tbl, idev->nd_parms);
2525 neigh_ifdown(&nd_tbl, dev);
2526 in6_dev_put(idev);
2527 }
2528 return 0;
2529 }
2530
2531 static void addrconf_rs_timer(unsigned long data)
2532 {
2533 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2534
2535 if (ifp->idev->cnf.forwarding)
2536 goto out;
2537
2538 if (ifp->idev->if_flags & IF_RA_RCVD) {
2539 /*
2540 * Announcement received after solicitation
2541 * was sent
2542 */
2543 goto out;
2544 }
2545
2546 spin_lock(&ifp->lock);
2547 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2548 struct in6_addr all_routers;
2549
2550 /* The wait after the last probe can be shorter */
2551 addrconf_mod_timer(ifp, AC_RS,
2552 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2553 ifp->idev->cnf.rtr_solicit_delay :
2554 ifp->idev->cnf.rtr_solicit_interval);
2555 spin_unlock(&ifp->lock);
2556
2557 ipv6_addr_all_routers(&all_routers);
2558
2559 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2560 } else {
2561 spin_unlock(&ifp->lock);
2562 /*
2563 * Note: we do not support deprecated "all on-link"
2564 * assumption any longer.
2565 */
2566 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2567 ifp->idev->dev->name);
2568 }
2569
2570 out:
2571 in6_ifa_put(ifp);
2572 }
2573
2574 /*
2575 * Duplicate Address Detection
2576 */
2577 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2578 {
2579 unsigned long rand_num;
2580 struct inet6_dev *idev = ifp->idev;
2581
2582 if (ifp->flags & IFA_F_OPTIMISTIC)
2583 rand_num = 0;
2584 else
2585 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2586
2587 ifp->probes = idev->cnf.dad_transmits;
2588 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2589 }
2590
2591 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2592 {
2593 struct inet6_dev *idev = ifp->idev;
2594 struct net_device *dev = idev->dev;
2595
2596 addrconf_join_solict(dev, &ifp->addr);
2597
2598 net_srandom(ifp->addr.s6_addr32[3]);
2599
2600 read_lock_bh(&idev->lock);
2601 if (ifp->dead)
2602 goto out;
2603 spin_lock_bh(&ifp->lock);
2604
2605 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2606 !(ifp->flags&IFA_F_TENTATIVE) ||
2607 ifp->flags & IFA_F_NODAD) {
2608 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2609 spin_unlock_bh(&ifp->lock);
2610 read_unlock_bh(&idev->lock);
2611
2612 addrconf_dad_completed(ifp);
2613 return;
2614 }
2615
2616 if (!(idev->if_flags & IF_READY)) {
2617 spin_unlock_bh(&ifp->lock);
2618 read_unlock_bh(&idev->lock);
2619 /*
2620 * If the defice is not ready:
2621 * - keep it tentative if it is a permanent address.
2622 * - otherwise, kill it.
2623 */
2624 in6_ifa_hold(ifp);
2625 addrconf_dad_stop(ifp);
2626 return;
2627 }
2628
2629 /*
2630 * Optimistic nodes can start receiving
2631 * Frames right away
2632 */
2633 if(ifp->flags & IFA_F_OPTIMISTIC)
2634 ip6_ins_rt(ifp->rt);
2635
2636 addrconf_dad_kick(ifp);
2637 spin_unlock_bh(&ifp->lock);
2638 out:
2639 read_unlock_bh(&idev->lock);
2640 }
2641
2642 static void addrconf_dad_timer(unsigned long data)
2643 {
2644 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2645 struct inet6_dev *idev = ifp->idev;
2646 struct in6_addr unspec;
2647 struct in6_addr mcaddr;
2648
2649 read_lock_bh(&idev->lock);
2650 if (idev->dead) {
2651 read_unlock_bh(&idev->lock);
2652 goto out;
2653 }
2654 spin_lock_bh(&ifp->lock);
2655 if (ifp->probes == 0) {
2656 /*
2657 * DAD was successful
2658 */
2659
2660 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2661 spin_unlock_bh(&ifp->lock);
2662 read_unlock_bh(&idev->lock);
2663
2664 addrconf_dad_completed(ifp);
2665
2666 goto out;
2667 }
2668
2669 ifp->probes--;
2670 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2671 spin_unlock_bh(&ifp->lock);
2672 read_unlock_bh(&idev->lock);
2673
2674 /* send a neighbour solicitation for our addr */
2675 memset(&unspec, 0, sizeof(unspec));
2676 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2677 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2678 out:
2679 in6_ifa_put(ifp);
2680 }
2681
2682 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2683 {
2684 struct net_device * dev = ifp->idev->dev;
2685
2686 /*
2687 * Configure the address for reception. Now it is valid.
2688 */
2689
2690 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2691
2692 /* If added prefix is link local and forwarding is off,
2693 start sending router solicitations.
2694 */
2695
2696 if (ifp->idev->cnf.forwarding == 0 &&
2697 ifp->idev->cnf.rtr_solicits > 0 &&
2698 (dev->flags&IFF_LOOPBACK) == 0 &&
2699 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2700 struct in6_addr all_routers;
2701
2702 ipv6_addr_all_routers(&all_routers);
2703
2704 /*
2705 * If a host as already performed a random delay
2706 * [...] as part of DAD [...] there is no need
2707 * to delay again before sending the first RS
2708 */
2709 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2710
2711 spin_lock_bh(&ifp->lock);
2712 ifp->probes = 1;
2713 ifp->idev->if_flags |= IF_RS_SENT;
2714 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2715 spin_unlock_bh(&ifp->lock);
2716 }
2717 }
2718
2719 static void addrconf_dad_run(struct inet6_dev *idev) {
2720 struct inet6_ifaddr *ifp;
2721
2722 read_lock_bh(&idev->lock);
2723 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2724 spin_lock_bh(&ifp->lock);
2725 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2726 spin_unlock_bh(&ifp->lock);
2727 continue;
2728 }
2729 spin_unlock_bh(&ifp->lock);
2730 addrconf_dad_kick(ifp);
2731 }
2732 read_unlock_bh(&idev->lock);
2733 }
2734
2735 #ifdef CONFIG_PROC_FS
2736 struct if6_iter_state {
2737 int bucket;
2738 };
2739
2740 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2741 {
2742 struct inet6_ifaddr *ifa = NULL;
2743 struct if6_iter_state *state = seq->private;
2744
2745 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2746 ifa = inet6_addr_lst[state->bucket];
2747 if (ifa)
2748 break;
2749 }
2750 return ifa;
2751 }
2752
2753 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2754 {
2755 struct if6_iter_state *state = seq->private;
2756
2757 ifa = ifa->lst_next;
2758 try_again:
2759 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2760 ifa = inet6_addr_lst[state->bucket];
2761 goto try_again;
2762 }
2763 return ifa;
2764 }
2765
2766 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2767 {
2768 struct inet6_ifaddr *ifa = if6_get_first(seq);
2769
2770 if (ifa)
2771 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2772 --pos;
2773 return pos ? NULL : ifa;
2774 }
2775
2776 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2777 {
2778 read_lock_bh(&addrconf_hash_lock);
2779 return if6_get_idx(seq, *pos);
2780 }
2781
2782 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2783 {
2784 struct inet6_ifaddr *ifa;
2785
2786 ifa = if6_get_next(seq, v);
2787 ++*pos;
2788 return ifa;
2789 }
2790
2791 static void if6_seq_stop(struct seq_file *seq, void *v)
2792 {
2793 read_unlock_bh(&addrconf_hash_lock);
2794 }
2795
2796 static int if6_seq_show(struct seq_file *seq, void *v)
2797 {
2798 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2799 seq_printf(seq,
2800 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2801 NIP6(ifp->addr),
2802 ifp->idev->dev->ifindex,
2803 ifp->prefix_len,
2804 ifp->scope,
2805 ifp->flags,
2806 ifp->idev->dev->name);
2807 return 0;
2808 }
2809
2810 static const struct seq_operations if6_seq_ops = {
2811 .start = if6_seq_start,
2812 .next = if6_seq_next,
2813 .show = if6_seq_show,
2814 .stop = if6_seq_stop,
2815 };
2816
2817 static int if6_seq_open(struct inode *inode, struct file *file)
2818 {
2819 return seq_open_private(file, &if6_seq_ops,
2820 sizeof(struct if6_iter_state));
2821 }
2822
2823 static const struct file_operations if6_fops = {
2824 .owner = THIS_MODULE,
2825 .open = if6_seq_open,
2826 .read = seq_read,
2827 .llseek = seq_lseek,
2828 .release = seq_release_private,
2829 };
2830
2831 int __init if6_proc_init(void)
2832 {
2833 if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
2834 return -ENOMEM;
2835 return 0;
2836 }
2837
2838 void if6_proc_exit(void)
2839 {
2840 proc_net_remove(&init_net, "if_inet6");
2841 }
2842 #endif /* CONFIG_PROC_FS */
2843
2844 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2845 /* Check if address is a home address configured on any interface. */
2846 int ipv6_chk_home_addr(struct in6_addr *addr)
2847 {
2848 int ret = 0;
2849 struct inet6_ifaddr * ifp;
2850 u8 hash = ipv6_addr_hash(addr);
2851 read_lock_bh(&addrconf_hash_lock);
2852 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2853 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2854 (ifp->flags & IFA_F_HOMEADDRESS)) {
2855 ret = 1;
2856 break;
2857 }
2858 }
2859 read_unlock_bh(&addrconf_hash_lock);
2860 return ret;
2861 }
2862 #endif
2863
2864 /*
2865 * Periodic address status verification
2866 */
2867
2868 static void addrconf_verify(unsigned long foo)
2869 {
2870 struct inet6_ifaddr *ifp;
2871 unsigned long now, next;
2872 int i;
2873
2874 spin_lock_bh(&addrconf_verify_lock);
2875 now = jiffies;
2876 next = now + ADDR_CHECK_FREQUENCY;
2877
2878 del_timer(&addr_chk_timer);
2879
2880 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2881
2882 restart:
2883 read_lock(&addrconf_hash_lock);
2884 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2885 unsigned long age;
2886 #ifdef CONFIG_IPV6_PRIVACY
2887 unsigned long regen_advance;
2888 #endif
2889
2890 if (ifp->flags & IFA_F_PERMANENT)
2891 continue;
2892
2893 spin_lock(&ifp->lock);
2894 age = (now - ifp->tstamp) / HZ;
2895
2896 #ifdef CONFIG_IPV6_PRIVACY
2897 regen_advance = ifp->idev->cnf.regen_max_retry *
2898 ifp->idev->cnf.dad_transmits *
2899 ifp->idev->nd_parms->retrans_time / HZ;
2900 #endif
2901
2902 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2903 age >= ifp->valid_lft) {
2904 spin_unlock(&ifp->lock);
2905 in6_ifa_hold(ifp);
2906 read_unlock(&addrconf_hash_lock);
2907 ipv6_del_addr(ifp);
2908 goto restart;
2909 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2910 spin_unlock(&ifp->lock);
2911 continue;
2912 } else if (age >= ifp->prefered_lft) {
2913 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2914 int deprecate = 0;
2915
2916 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2917 deprecate = 1;
2918 ifp->flags |= IFA_F_DEPRECATED;
2919 }
2920
2921 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2922 next = ifp->tstamp + ifp->valid_lft * HZ;
2923
2924 spin_unlock(&ifp->lock);
2925
2926 if (deprecate) {
2927 in6_ifa_hold(ifp);
2928 read_unlock(&addrconf_hash_lock);
2929
2930 ipv6_ifa_notify(0, ifp);
2931 in6_ifa_put(ifp);
2932 goto restart;
2933 }
2934 #ifdef CONFIG_IPV6_PRIVACY
2935 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2936 !(ifp->flags&IFA_F_TENTATIVE)) {
2937 if (age >= ifp->prefered_lft - regen_advance) {
2938 struct inet6_ifaddr *ifpub = ifp->ifpub;
2939 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2940 next = ifp->tstamp + ifp->prefered_lft * HZ;
2941 if (!ifp->regen_count && ifpub) {
2942 ifp->regen_count++;
2943 in6_ifa_hold(ifp);
2944 in6_ifa_hold(ifpub);
2945 spin_unlock(&ifp->lock);
2946 read_unlock(&addrconf_hash_lock);
2947 spin_lock(&ifpub->lock);
2948 ifpub->regen_count = 0;
2949 spin_unlock(&ifpub->lock);
2950 ipv6_create_tempaddr(ifpub, ifp);
2951 in6_ifa_put(ifpub);
2952 in6_ifa_put(ifp);
2953 goto restart;
2954 }
2955 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2956 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2957 spin_unlock(&ifp->lock);
2958 #endif
2959 } else {
2960 /* ifp->prefered_lft <= ifp->valid_lft */
2961 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2962 next = ifp->tstamp + ifp->prefered_lft * HZ;
2963 spin_unlock(&ifp->lock);
2964 }
2965 }
2966 read_unlock(&addrconf_hash_lock);
2967 }
2968
2969 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2970 add_timer(&addr_chk_timer);
2971 spin_unlock_bh(&addrconf_verify_lock);
2972 }
2973
2974 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2975 {
2976 struct in6_addr *pfx = NULL;
2977
2978 if (addr)
2979 pfx = nla_data(addr);
2980
2981 if (local) {
2982 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2983 pfx = NULL;
2984 else
2985 pfx = nla_data(local);
2986 }
2987
2988 return pfx;
2989 }
2990
2991 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
2992 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2993 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2994 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2995 };
2996
2997 static int
2998 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2999 {
3000 struct ifaddrmsg *ifm;
3001 struct nlattr *tb[IFA_MAX+1];
3002 struct in6_addr *pfx;
3003 int err;
3004
3005 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3006 if (err < 0)
3007 return err;
3008
3009 ifm = nlmsg_data(nlh);
3010 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3011 if (pfx == NULL)
3012 return -EINVAL;
3013
3014 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3015 }
3016
3017 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3018 u32 prefered_lft, u32 valid_lft)
3019 {
3020 u32 flags = RTF_EXPIRES;
3021
3022 if (!valid_lft || (prefered_lft > valid_lft))
3023 return -EINVAL;
3024
3025 if (valid_lft == INFINITY_LIFE_TIME) {
3026 ifa_flags |= IFA_F_PERMANENT;
3027 flags = 0;
3028 } else if (valid_lft >= 0x7FFFFFFF/HZ)
3029 valid_lft = 0x7FFFFFFF/HZ;
3030
3031 if (prefered_lft == 0)
3032 ifa_flags |= IFA_F_DEPRECATED;
3033 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3034 (prefered_lft != INFINITY_LIFE_TIME))
3035 prefered_lft = 0x7FFFFFFF/HZ;
3036
3037 spin_lock_bh(&ifp->lock);
3038 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3039 ifp->tstamp = jiffies;
3040 ifp->valid_lft = valid_lft;
3041 ifp->prefered_lft = prefered_lft;
3042
3043 spin_unlock_bh(&ifp->lock);
3044 if (!(ifp->flags&IFA_F_TENTATIVE))
3045 ipv6_ifa_notify(0, ifp);
3046
3047 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3048 jiffies_to_clock_t(valid_lft * HZ), flags);
3049 addrconf_verify(0);
3050
3051 return 0;
3052 }
3053
3054 static int
3055 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3056 {
3057 struct ifaddrmsg *ifm;
3058 struct nlattr *tb[IFA_MAX+1];
3059 struct in6_addr *pfx;
3060 struct inet6_ifaddr *ifa;
3061 struct net_device *dev;
3062 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3063 u8 ifa_flags;
3064 int err;
3065
3066 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3067 if (err < 0)
3068 return err;
3069
3070 ifm = nlmsg_data(nlh);
3071 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3072 if (pfx == NULL)
3073 return -EINVAL;
3074
3075 if (tb[IFA_CACHEINFO]) {
3076 struct ifa_cacheinfo *ci;
3077
3078 ci = nla_data(tb[IFA_CACHEINFO]);
3079 valid_lft = ci->ifa_valid;
3080 preferred_lft = ci->ifa_prefered;
3081 } else {
3082 preferred_lft = INFINITY_LIFE_TIME;
3083 valid_lft = INFINITY_LIFE_TIME;
3084 }
3085
3086 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3087 if (dev == NULL)
3088 return -ENODEV;
3089
3090 /* We ignore other flags so far. */
3091 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3092
3093 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3094 if (ifa == NULL) {
3095 /*
3096 * It would be best to check for !NLM_F_CREATE here but
3097 * userspace alreay relies on not having to provide this.
3098 */
3099 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3100 ifa_flags, preferred_lft, valid_lft);
3101 }
3102
3103 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3104 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3105 err = -EEXIST;
3106 else
3107 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3108
3109 in6_ifa_put(ifa);
3110
3111 return err;
3112 }
3113
3114 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3115 u8 scope, int ifindex)
3116 {
3117 struct ifaddrmsg *ifm;
3118
3119 ifm = nlmsg_data(nlh);
3120 ifm->ifa_family = AF_INET6;
3121 ifm->ifa_prefixlen = prefixlen;
3122 ifm->ifa_flags = flags;
3123 ifm->ifa_scope = scope;
3124 ifm->ifa_index = ifindex;
3125 }
3126
3127 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3128 unsigned long tstamp, u32 preferred, u32 valid)
3129 {
3130 struct ifa_cacheinfo ci;
3131
3132 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3133 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3134 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3135 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3136 ci.ifa_prefered = preferred;
3137 ci.ifa_valid = valid;
3138
3139 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3140 }
3141
3142 static inline int rt_scope(int ifa_scope)
3143 {
3144 if (ifa_scope & IFA_HOST)
3145 return RT_SCOPE_HOST;
3146 else if (ifa_scope & IFA_LINK)
3147 return RT_SCOPE_LINK;
3148 else if (ifa_scope & IFA_SITE)
3149 return RT_SCOPE_SITE;
3150 else
3151 return RT_SCOPE_UNIVERSE;
3152 }
3153
3154 static inline int inet6_ifaddr_msgsize(void)
3155 {
3156 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3157 + nla_total_size(16) /* IFA_ADDRESS */
3158 + nla_total_size(sizeof(struct ifa_cacheinfo));
3159 }
3160
3161 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3162 u32 pid, u32 seq, int event, unsigned int flags)
3163 {
3164 struct nlmsghdr *nlh;
3165 u32 preferred, valid;
3166
3167 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3168 if (nlh == NULL)
3169 return -EMSGSIZE;
3170
3171 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3172 ifa->idev->dev->ifindex);
3173
3174 if (!(ifa->flags&IFA_F_PERMANENT)) {
3175 preferred = ifa->prefered_lft;
3176 valid = ifa->valid_lft;
3177 if (preferred != INFINITY_LIFE_TIME) {
3178 long tval = (jiffies - ifa->tstamp)/HZ;
3179 preferred -= tval;
3180 if (valid != INFINITY_LIFE_TIME)
3181 valid -= tval;
3182 }
3183 } else {
3184 preferred = INFINITY_LIFE_TIME;
3185 valid = INFINITY_LIFE_TIME;
3186 }
3187
3188 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3189 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3190 nlmsg_cancel(skb, nlh);
3191 return -EMSGSIZE;
3192 }
3193
3194 return nlmsg_end(skb, nlh);
3195 }
3196
3197 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3198 u32 pid, u32 seq, int event, u16 flags)
3199 {
3200 struct nlmsghdr *nlh;
3201 u8 scope = RT_SCOPE_UNIVERSE;
3202 int ifindex = ifmca->idev->dev->ifindex;
3203
3204 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3205 scope = RT_SCOPE_SITE;
3206
3207 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3208 if (nlh == NULL)
3209 return -EMSGSIZE;
3210
3211 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3212 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3213 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3214 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3215 nlmsg_cancel(skb, nlh);
3216 return -EMSGSIZE;
3217 }
3218
3219 return nlmsg_end(skb, nlh);
3220 }
3221
3222 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3223 u32 pid, u32 seq, int event, unsigned int flags)
3224 {
3225 struct nlmsghdr *nlh;
3226 u8 scope = RT_SCOPE_UNIVERSE;
3227 int ifindex = ifaca->aca_idev->dev->ifindex;
3228
3229 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3230 scope = RT_SCOPE_SITE;
3231
3232 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3233 if (nlh == NULL)
3234 return -EMSGSIZE;
3235
3236 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3237 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3238 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3239 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3240 nlmsg_cancel(skb, nlh);
3241 return -EMSGSIZE;
3242 }
3243
3244 return nlmsg_end(skb, nlh);
3245 }
3246
3247 enum addr_type_t
3248 {
3249 UNICAST_ADDR,
3250 MULTICAST_ADDR,
3251 ANYCAST_ADDR,
3252 };
3253
3254 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3255 enum addr_type_t type)
3256 {
3257 int idx, ip_idx;
3258 int s_idx, s_ip_idx;
3259 int err = 1;
3260 struct net_device *dev;
3261 struct inet6_dev *idev = NULL;
3262 struct inet6_ifaddr *ifa;
3263 struct ifmcaddr6 *ifmca;
3264 struct ifacaddr6 *ifaca;
3265
3266 s_idx = cb->args[0];
3267 s_ip_idx = ip_idx = cb->args[1];
3268
3269 idx = 0;
3270 for_each_netdev(&init_net, dev) {
3271 if (idx < s_idx)
3272 goto cont;
3273 if (idx > s_idx)
3274 s_ip_idx = 0;
3275 ip_idx = 0;
3276 if ((idev = in6_dev_get(dev)) == NULL)
3277 goto cont;
3278 read_lock_bh(&idev->lock);
3279 switch (type) {
3280 case UNICAST_ADDR:
3281 /* unicast address incl. temp addr */
3282 for (ifa = idev->addr_list; ifa;
3283 ifa = ifa->if_next, ip_idx++) {
3284 if (ip_idx < s_ip_idx)
3285 continue;
3286 if ((err = inet6_fill_ifaddr(skb, ifa,
3287 NETLINK_CB(cb->skb).pid,
3288 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3289 NLM_F_MULTI)) <= 0)
3290 goto done;
3291 }
3292 break;
3293 case MULTICAST_ADDR:
3294 /* multicast address */
3295 for (ifmca = idev->mc_list; ifmca;
3296 ifmca = ifmca->next, ip_idx++) {
3297 if (ip_idx < s_ip_idx)
3298 continue;
3299 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3300 NETLINK_CB(cb->skb).pid,
3301 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3302 NLM_F_MULTI)) <= 0)
3303 goto done;
3304 }
3305 break;
3306 case ANYCAST_ADDR:
3307 /* anycast address */
3308 for (ifaca = idev->ac_list; ifaca;
3309 ifaca = ifaca->aca_next, ip_idx++) {
3310 if (ip_idx < s_ip_idx)
3311 continue;
3312 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3313 NETLINK_CB(cb->skb).pid,
3314 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3315 NLM_F_MULTI)) <= 0)
3316 goto done;
3317 }
3318 break;
3319 default:
3320 break;
3321 }
3322 read_unlock_bh(&idev->lock);
3323 in6_dev_put(idev);
3324 cont:
3325 idx++;
3326 }
3327 done:
3328 if (err <= 0) {
3329 read_unlock_bh(&idev->lock);
3330 in6_dev_put(idev);
3331 }
3332 cb->args[0] = idx;
3333 cb->args[1] = ip_idx;
3334 return skb->len;
3335 }
3336
3337 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3338 {
3339 enum addr_type_t type = UNICAST_ADDR;
3340 return inet6_dump_addr(skb, cb, type);
3341 }
3342
3343 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3344 {
3345 enum addr_type_t type = MULTICAST_ADDR;
3346 return inet6_dump_addr(skb, cb, type);
3347 }
3348
3349
3350 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3351 {
3352 enum addr_type_t type = ANYCAST_ADDR;
3353 return inet6_dump_addr(skb, cb, type);
3354 }
3355
3356 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3357 void *arg)
3358 {
3359 struct ifaddrmsg *ifm;
3360 struct nlattr *tb[IFA_MAX+1];
3361 struct in6_addr *addr = NULL;
3362 struct net_device *dev = NULL;
3363 struct inet6_ifaddr *ifa;
3364 struct sk_buff *skb;
3365 int err;
3366
3367 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3368 if (err < 0)
3369 goto errout;
3370
3371 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3372 if (addr == NULL) {
3373 err = -EINVAL;
3374 goto errout;
3375 }
3376
3377 ifm = nlmsg_data(nlh);
3378 if (ifm->ifa_index)
3379 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3380
3381 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3382 err = -EADDRNOTAVAIL;
3383 goto errout;
3384 }
3385
3386 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3387 err = -ENOBUFS;
3388 goto errout_ifa;
3389 }
3390
3391 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3392 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3393 if (err < 0) {
3394 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3395 WARN_ON(err == -EMSGSIZE);
3396 kfree_skb(skb);
3397 goto errout_ifa;
3398 }
3399 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3400 errout_ifa:
3401 in6_ifa_put(ifa);
3402 errout:
3403 return err;
3404 }
3405
3406 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3407 {
3408 struct sk_buff *skb;
3409 int err = -ENOBUFS;
3410
3411 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3412 if (skb == NULL)
3413 goto errout;
3414
3415 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3416 if (err < 0) {
3417 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3418 WARN_ON(err == -EMSGSIZE);
3419 kfree_skb(skb);
3420 goto errout;
3421 }
3422 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3423 errout:
3424 if (err < 0)
3425 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3426 }
3427
3428 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3429 __s32 *array, int bytes)
3430 {
3431 BUG_ON(bytes < (DEVCONF_MAX * 4));
3432
3433 memset(array, 0, bytes);
3434 array[DEVCONF_FORWARDING] = cnf->forwarding;
3435 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3436 array[DEVCONF_MTU6] = cnf->mtu6;
3437 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3438 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3439 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3440 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3441 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3442 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3443 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3444 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3445 #ifdef CONFIG_IPV6_PRIVACY
3446 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3447 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3448 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3449 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3450 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3451 #endif
3452 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3453 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3454 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3455 #ifdef CONFIG_IPV6_ROUTER_PREF
3456 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3457 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3458 #ifdef CONFIG_IPV6_ROUTE_INFO
3459 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3460 #endif
3461 #endif
3462 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3463 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3464 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3465 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3466 #endif
3467 }
3468
3469 static inline size_t inet6_if_nlmsg_size(void)
3470 {
3471 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3472 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3473 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3474 + nla_total_size(4) /* IFLA_MTU */
3475 + nla_total_size(4) /* IFLA_LINK */
3476 + nla_total_size( /* IFLA_PROTINFO */
3477 nla_total_size(4) /* IFLA_INET6_FLAGS */
3478 + nla_total_size(sizeof(struct ifla_cacheinfo))
3479 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3480 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3481 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3482 );
3483 }
3484
3485 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3486 int bytes)
3487 {
3488 int i;
3489 int pad = bytes - sizeof(u64) * items;
3490 BUG_ON(pad < 0);
3491
3492 /* Use put_unaligned() because stats may not be aligned for u64. */
3493 put_unaligned(items, &stats[0]);
3494 for (i = 1; i < items; i++)
3495 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3496
3497 memset(&stats[items], 0, pad);
3498 }
3499
3500 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3501 int bytes)
3502 {
3503 switch(attrtype) {
3504 case IFLA_INET6_STATS:
3505 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3506 break;
3507 case IFLA_INET6_ICMP6STATS:
3508 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3509 break;
3510 }
3511 }
3512
3513 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3514 u32 pid, u32 seq, int event, unsigned int flags)
3515 {
3516 struct net_device *dev = idev->dev;
3517 struct nlattr *nla;
3518 struct ifinfomsg *hdr;
3519 struct nlmsghdr *nlh;
3520 void *protoinfo;
3521 struct ifla_cacheinfo ci;
3522
3523 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3524 if (nlh == NULL)
3525 return -EMSGSIZE;
3526
3527 hdr = nlmsg_data(nlh);
3528 hdr->ifi_family = AF_INET6;
3529 hdr->__ifi_pad = 0;
3530 hdr->ifi_type = dev->type;
3531 hdr->ifi_index = dev->ifindex;
3532 hdr->ifi_flags = dev_get_flags(dev);
3533 hdr->ifi_change = 0;
3534
3535 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3536
3537 if (dev->addr_len)
3538 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3539
3540 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3541 if (dev->ifindex != dev->iflink)
3542 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3543
3544 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3545 if (protoinfo == NULL)
3546 goto nla_put_failure;
3547
3548 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3549
3550 ci.max_reasm_len = IPV6_MAXPLEN;
3551 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3552 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3553 ci.reachable_time = idev->nd_parms->reachable_time;
3554 ci.retrans_time = idev->nd_parms->retrans_time;
3555 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3556
3557 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3558 if (nla == NULL)
3559 goto nla_put_failure;
3560 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3561
3562 /* XXX - MC not implemented */
3563
3564 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3565 if (nla == NULL)
3566 goto nla_put_failure;
3567 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3568
3569 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3570 if (nla == NULL)
3571 goto nla_put_failure;
3572 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3573
3574 nla_nest_end(skb, protoinfo);
3575 return nlmsg_end(skb, nlh);
3576
3577 nla_put_failure:
3578 nlmsg_cancel(skb, nlh);
3579 return -EMSGSIZE;
3580 }
3581
3582 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3583 {
3584 int idx, err;
3585 int s_idx = cb->args[0];
3586 struct net_device *dev;
3587 struct inet6_dev *idev;
3588
3589 read_lock(&dev_base_lock);
3590 idx = 0;
3591 for_each_netdev(&init_net, dev) {
3592 if (idx < s_idx)
3593 goto cont;
3594 if ((idev = in6_dev_get(dev)) == NULL)
3595 goto cont;
3596 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3597 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3598 in6_dev_put(idev);
3599 if (err <= 0)
3600 break;
3601 cont:
3602 idx++;
3603 }
3604 read_unlock(&dev_base_lock);
3605 cb->args[0] = idx;
3606
3607 return skb->len;
3608 }
3609
3610 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3611 {
3612 struct sk_buff *skb;
3613 int err = -ENOBUFS;
3614
3615 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3616 if (skb == NULL)
3617 goto errout;
3618
3619 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3620 if (err < 0) {
3621 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3622 WARN_ON(err == -EMSGSIZE);
3623 kfree_skb(skb);
3624 goto errout;
3625 }
3626 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3627 errout:
3628 if (err < 0)
3629 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3630 }
3631
3632 static inline size_t inet6_prefix_nlmsg_size(void)
3633 {
3634 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3635 + nla_total_size(sizeof(struct in6_addr))
3636 + nla_total_size(sizeof(struct prefix_cacheinfo));
3637 }
3638
3639 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3640 struct prefix_info *pinfo, u32 pid, u32 seq,
3641 int event, unsigned int flags)
3642 {
3643 struct prefixmsg *pmsg;
3644 struct nlmsghdr *nlh;
3645 struct prefix_cacheinfo ci;
3646
3647 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3648 if (nlh == NULL)
3649 return -EMSGSIZE;
3650
3651 pmsg = nlmsg_data(nlh);
3652 pmsg->prefix_family = AF_INET6;
3653 pmsg->prefix_pad1 = 0;
3654 pmsg->prefix_pad2 = 0;
3655 pmsg->prefix_ifindex = idev->dev->ifindex;
3656 pmsg->prefix_len = pinfo->prefix_len;
3657 pmsg->prefix_type = pinfo->type;
3658 pmsg->prefix_pad3 = 0;
3659 pmsg->prefix_flags = 0;
3660 if (pinfo->onlink)
3661 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3662 if (pinfo->autoconf)
3663 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3664
3665 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3666
3667 ci.preferred_time = ntohl(pinfo->prefered);
3668 ci.valid_time = ntohl(pinfo->valid);
3669 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3670
3671 return nlmsg_end(skb, nlh);
3672
3673 nla_put_failure:
3674 nlmsg_cancel(skb, nlh);
3675 return -EMSGSIZE;
3676 }
3677
3678 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3679 struct prefix_info *pinfo)
3680 {
3681 struct sk_buff *skb;
3682 int err = -ENOBUFS;
3683
3684 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3685 if (skb == NULL)
3686 goto errout;
3687
3688 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3689 if (err < 0) {
3690 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3691 WARN_ON(err == -EMSGSIZE);
3692 kfree_skb(skb);
3693 goto errout;
3694 }
3695 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3696 errout:
3697 if (err < 0)
3698 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3699 }
3700
3701 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3702 {
3703 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3704
3705 switch (event) {
3706 case RTM_NEWADDR:
3707 /*
3708 * If the address was optimistic
3709 * we inserted the route at the start of
3710 * our DAD process, so we don't need
3711 * to do it again
3712 */
3713 if (!(ifp->rt->rt6i_node))
3714 ip6_ins_rt(ifp->rt);
3715 if (ifp->idev->cnf.forwarding)
3716 addrconf_join_anycast(ifp);
3717 break;
3718 case RTM_DELADDR:
3719 if (ifp->idev->cnf.forwarding)
3720 addrconf_leave_anycast(ifp);
3721 addrconf_leave_solict(ifp->idev, &ifp->addr);
3722 dst_hold(&ifp->rt->u.dst);
3723 if (ip6_del_rt(ifp->rt))
3724 dst_free(&ifp->rt->u.dst);
3725 break;
3726 }
3727 }
3728
3729 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3730 {
3731 rcu_read_lock_bh();
3732 if (likely(ifp->idev->dead == 0))
3733 __ipv6_ifa_notify(event, ifp);
3734 rcu_read_unlock_bh();
3735 }
3736
3737 #ifdef CONFIG_SYSCTL
3738
3739 static
3740 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3741 void __user *buffer, size_t *lenp, loff_t *ppos)
3742 {
3743 int *valp = ctl->data;
3744 int val = *valp;
3745 int ret;
3746
3747 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3748
3749 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3750 if (valp != &ipv6_devconf.forwarding) {
3751 if ((!*valp) ^ (!val)) {
3752 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3753 if (idev == NULL)
3754 return ret;
3755 dev_forward_change(idev);
3756 }
3757 } else {
3758 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3759 addrconf_forward_change();
3760 }
3761 if (*valp)
3762 rt6_purge_dflt_routers();
3763 }
3764
3765 return ret;
3766 }
3767
3768 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3769 int __user *name, int nlen,
3770 void __user *oldval,
3771 size_t __user *oldlenp,
3772 void __user *newval, size_t newlen)
3773 {
3774 int *valp = table->data;
3775 int new;
3776
3777 if (!newval || !newlen)
3778 return 0;
3779 if (newlen != sizeof(int))
3780 return -EINVAL;
3781 if (get_user(new, (int __user *)newval))
3782 return -EFAULT;
3783 if (new == *valp)
3784 return 0;
3785 if (oldval && oldlenp) {
3786 size_t len;
3787 if (get_user(len, oldlenp))
3788 return -EFAULT;
3789 if (len) {
3790 if (len > table->maxlen)
3791 len = table->maxlen;
3792 if (copy_to_user(oldval, valp, len))
3793 return -EFAULT;
3794 if (put_user(len, oldlenp))
3795 return -EFAULT;
3796 }
3797 }
3798
3799 if (valp != &ipv6_devconf_dflt.forwarding) {
3800 if (valp != &ipv6_devconf.forwarding) {
3801 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3802 int changed;
3803 if (unlikely(idev == NULL))
3804 return -ENODEV;
3805 changed = (!*valp) ^ (!new);
3806 *valp = new;
3807 if (changed)
3808 dev_forward_change(idev);
3809 } else {
3810 *valp = new;
3811 addrconf_forward_change();
3812 }
3813
3814 if (*valp)
3815 rt6_purge_dflt_routers();
3816 } else
3817 *valp = new;
3818
3819 return 1;
3820 }
3821
3822 static struct addrconf_sysctl_table
3823 {
3824 struct ctl_table_header *sysctl_header;
3825 ctl_table addrconf_vars[__NET_IPV6_MAX];
3826 ctl_table addrconf_dev[2];
3827 ctl_table addrconf_conf_dir[2];
3828 ctl_table addrconf_proto_dir[2];
3829 ctl_table addrconf_root_dir[2];
3830 } addrconf_sysctl __read_mostly = {
3831 .sysctl_header = NULL,
3832 .addrconf_vars = {
3833 {
3834 .ctl_name = NET_IPV6_FORWARDING,
3835 .procname = "forwarding",
3836 .data = &ipv6_devconf.forwarding,
3837 .maxlen = sizeof(int),
3838 .mode = 0644,
3839 .proc_handler = &addrconf_sysctl_forward,
3840 .strategy = &addrconf_sysctl_forward_strategy,
3841 },
3842 {
3843 .ctl_name = NET_IPV6_HOP_LIMIT,
3844 .procname = "hop_limit",
3845 .data = &ipv6_devconf.hop_limit,
3846 .maxlen = sizeof(int),
3847 .mode = 0644,
3848 .proc_handler = proc_dointvec,
3849 },
3850 {
3851 .ctl_name = NET_IPV6_MTU,
3852 .procname = "mtu",
3853 .data = &ipv6_devconf.mtu6,
3854 .maxlen = sizeof(int),
3855 .mode = 0644,
3856 .proc_handler = &proc_dointvec,
3857 },
3858 {
3859 .ctl_name = NET_IPV6_ACCEPT_RA,
3860 .procname = "accept_ra",
3861 .data = &ipv6_devconf.accept_ra,
3862 .maxlen = sizeof(int),
3863 .mode = 0644,
3864 .proc_handler = &proc_dointvec,
3865 },
3866 {
3867 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3868 .procname = "accept_redirects",
3869 .data = &ipv6_devconf.accept_redirects,
3870 .maxlen = sizeof(int),
3871 .mode = 0644,
3872 .proc_handler = &proc_dointvec,
3873 },
3874 {
3875 .ctl_name = NET_IPV6_AUTOCONF,
3876 .procname = "autoconf",
3877 .data = &ipv6_devconf.autoconf,
3878 .maxlen = sizeof(int),
3879 .mode = 0644,
3880 .proc_handler = &proc_dointvec,
3881 },
3882 {
3883 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3884 .procname = "dad_transmits",
3885 .data = &ipv6_devconf.dad_transmits,
3886 .maxlen = sizeof(int),
3887 .mode = 0644,
3888 .proc_handler = &proc_dointvec,
3889 },
3890 {
3891 .ctl_name = NET_IPV6_RTR_SOLICITS,
3892 .procname = "router_solicitations",
3893 .data = &ipv6_devconf.rtr_solicits,
3894 .maxlen = sizeof(int),
3895 .mode = 0644,
3896 .proc_handler = &proc_dointvec,
3897 },
3898 {
3899 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3900 .procname = "router_solicitation_interval",
3901 .data = &ipv6_devconf.rtr_solicit_interval,
3902 .maxlen = sizeof(int),
3903 .mode = 0644,
3904 .proc_handler = &proc_dointvec_jiffies,
3905 .strategy = &sysctl_jiffies,
3906 },
3907 {
3908 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3909 .procname = "router_solicitation_delay",
3910 .data = &ipv6_devconf.rtr_solicit_delay,
3911 .maxlen = sizeof(int),
3912 .mode = 0644,
3913 .proc_handler = &proc_dointvec_jiffies,
3914 .strategy = &sysctl_jiffies,
3915 },
3916 {
3917 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3918 .procname = "force_mld_version",
3919 .data = &ipv6_devconf.force_mld_version,
3920 .maxlen = sizeof(int),
3921 .mode = 0644,
3922 .proc_handler = &proc_dointvec,
3923 },
3924 #ifdef CONFIG_IPV6_PRIVACY
3925 {
3926 .ctl_name = NET_IPV6_USE_TEMPADDR,
3927 .procname = "use_tempaddr",
3928 .data = &ipv6_devconf.use_tempaddr,
3929 .maxlen = sizeof(int),
3930 .mode = 0644,
3931 .proc_handler = &proc_dointvec,
3932 },
3933 {
3934 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3935 .procname = "temp_valid_lft",
3936 .data = &ipv6_devconf.temp_valid_lft,
3937 .maxlen = sizeof(int),
3938 .mode = 0644,
3939 .proc_handler = &proc_dointvec,
3940 },
3941 {
3942 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3943 .procname = "temp_prefered_lft",
3944 .data = &ipv6_devconf.temp_prefered_lft,
3945 .maxlen = sizeof(int),
3946 .mode = 0644,
3947 .proc_handler = &proc_dointvec,
3948 },
3949 {
3950 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3951 .procname = "regen_max_retry",
3952 .data = &ipv6_devconf.regen_max_retry,
3953 .maxlen = sizeof(int),
3954 .mode = 0644,
3955 .proc_handler = &proc_dointvec,
3956 },
3957 {
3958 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3959 .procname = "max_desync_factor",
3960 .data = &ipv6_devconf.max_desync_factor,
3961 .maxlen = sizeof(int),
3962 .mode = 0644,
3963 .proc_handler = &proc_dointvec,
3964 },
3965 #endif
3966 {
3967 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3968 .procname = "max_addresses",
3969 .data = &ipv6_devconf.max_addresses,
3970 .maxlen = sizeof(int),
3971 .mode = 0644,
3972 .proc_handler = &proc_dointvec,
3973 },
3974 {
3975 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3976 .procname = "accept_ra_defrtr",
3977 .data = &ipv6_devconf.accept_ra_defrtr,
3978 .maxlen = sizeof(int),
3979 .mode = 0644,
3980 .proc_handler = &proc_dointvec,
3981 },
3982 {
3983 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3984 .procname = "accept_ra_pinfo",
3985 .data = &ipv6_devconf.accept_ra_pinfo,
3986 .maxlen = sizeof(int),
3987 .mode = 0644,
3988 .proc_handler = &proc_dointvec,
3989 },
3990 #ifdef CONFIG_IPV6_ROUTER_PREF
3991 {
3992 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3993 .procname = "accept_ra_rtr_pref",
3994 .data = &ipv6_devconf.accept_ra_rtr_pref,
3995 .maxlen = sizeof(int),
3996 .mode = 0644,
3997 .proc_handler = &proc_dointvec,
3998 },
3999 {
4000 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4001 .procname = "router_probe_interval",
4002 .data = &ipv6_devconf.rtr_probe_interval,
4003 .maxlen = sizeof(int),
4004 .mode = 0644,
4005 .proc_handler = &proc_dointvec_jiffies,
4006 .strategy = &sysctl_jiffies,
4007 },
4008 #ifdef CONFIG_IPV6_ROUTE_INFO
4009 {
4010 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4011 .procname = "accept_ra_rt_info_max_plen",
4012 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4013 .maxlen = sizeof(int),
4014 .mode = 0644,
4015 .proc_handler = &proc_dointvec,
4016 },
4017 #endif
4018 #endif
4019 {
4020 .ctl_name = NET_IPV6_PROXY_NDP,
4021 .procname = "proxy_ndp",
4022 .data = &ipv6_devconf.proxy_ndp,
4023 .maxlen = sizeof(int),
4024 .mode = 0644,
4025 .proc_handler = &proc_dointvec,
4026 },
4027 {
4028 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4029 .procname = "accept_source_route",
4030 .data = &ipv6_devconf.accept_source_route,
4031 .maxlen = sizeof(int),
4032 .mode = 0644,
4033 .proc_handler = &proc_dointvec,
4034 },
4035 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4036 {
4037 .ctl_name = CTL_UNNUMBERED,
4038 .procname = "optimistic_dad",
4039 .data = &ipv6_devconf.optimistic_dad,
4040 .maxlen = sizeof(int),
4041 .mode = 0644,
4042 .proc_handler = &proc_dointvec,
4043
4044 },
4045 #endif
4046 {
4047 .ctl_name = 0, /* sentinel */
4048 }
4049 },
4050 .addrconf_dev = {
4051 {
4052 .ctl_name = NET_PROTO_CONF_ALL,
4053 .procname = "all",
4054 .mode = 0555,
4055 .child = addrconf_sysctl.addrconf_vars,
4056 },
4057 {
4058 .ctl_name = 0, /* sentinel */
4059 }
4060 },
4061 .addrconf_conf_dir = {
4062 {
4063 .ctl_name = NET_IPV6_CONF,
4064 .procname = "conf",
4065 .mode = 0555,
4066 .child = addrconf_sysctl.addrconf_dev,
4067 },
4068 {
4069 .ctl_name = 0, /* sentinel */
4070 }
4071 },
4072 .addrconf_proto_dir = {
4073 {
4074 .ctl_name = NET_IPV6,
4075 .procname = "ipv6",
4076 .mode = 0555,
4077 .child = addrconf_sysctl.addrconf_conf_dir,
4078 },
4079 {
4080 .ctl_name = 0, /* sentinel */
4081 }
4082 },
4083 .addrconf_root_dir = {
4084 {
4085 .ctl_name = CTL_NET,
4086 .procname = "net",
4087 .mode = 0555,
4088 .child = addrconf_sysctl.addrconf_proto_dir,
4089 },
4090 {
4091 .ctl_name = 0, /* sentinel */
4092 }
4093 },
4094 };
4095
4096 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4097 {
4098 int i;
4099 struct net_device *dev = idev ? idev->dev : NULL;
4100 struct addrconf_sysctl_table *t;
4101 char *dev_name = NULL;
4102
4103 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4104 if (t == NULL)
4105 return;
4106 for (i=0; t->addrconf_vars[i].data; i++) {
4107 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4108 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4109 }
4110 if (dev) {
4111 dev_name = dev->name;
4112 t->addrconf_dev[0].ctl_name = dev->ifindex;
4113 } else {
4114 dev_name = "default";
4115 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4116 }
4117
4118 /*
4119 * Make a copy of dev_name, because '.procname' is regarded as const
4120 * by sysctl and we wouldn't want anyone to change it under our feet
4121 * (see SIOCSIFNAME).
4122 */
4123 dev_name = kstrdup(dev_name, GFP_KERNEL);
4124 if (!dev_name)
4125 goto free;
4126
4127 t->addrconf_dev[0].procname = dev_name;
4128
4129 t->addrconf_dev[0].child = t->addrconf_vars;
4130 t->addrconf_conf_dir[0].child = t->addrconf_dev;
4131 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
4132 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
4133
4134 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
4135 if (t->sysctl_header == NULL)
4136 goto free_procname;
4137 else
4138 p->sysctl = t;
4139 return;
4140
4141 /* error path */
4142 free_procname:
4143 kfree(dev_name);
4144 free:
4145 kfree(t);
4146
4147 return;
4148 }
4149
4150 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4151 {
4152 if (p->sysctl) {
4153 struct addrconf_sysctl_table *t = p->sysctl;
4154 p->sysctl = NULL;
4155 unregister_sysctl_table(t->sysctl_header);
4156 kfree(t->addrconf_dev[0].procname);
4157 kfree(t);
4158 }
4159 }
4160
4161
4162 #endif
4163
4164 /*
4165 * Device notifier
4166 */
4167
4168 int register_inet6addr_notifier(struct notifier_block *nb)
4169 {
4170 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4171 }
4172
4173 EXPORT_SYMBOL(register_inet6addr_notifier);
4174
4175 int unregister_inet6addr_notifier(struct notifier_block *nb)
4176 {
4177 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4178 }
4179
4180 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4181
4182 /*
4183 * Init / cleanup code
4184 */
4185
4186 int __init addrconf_init(void)
4187 {
4188 int err = 0;
4189
4190 /* The addrconf netdev notifier requires that loopback_dev
4191 * has it's ipv6 private information allocated and setup
4192 * before it can bring up and give link-local addresses
4193 * to other devices which are up.
4194 *
4195 * Unfortunately, loopback_dev is not necessarily the first
4196 * entry in the global dev_base list of net devices. In fact,
4197 * it is likely to be the very last entry on that list.
4198 * So this causes the notifier registry below to try and
4199 * give link-local addresses to all devices besides loopback_dev
4200 * first, then loopback_dev, which cases all the non-loopback_dev
4201 * devices to fail to get a link-local address.
4202 *
4203 * So, as a temporary fix, allocate the ipv6 structure for
4204 * loopback_dev first by hand.
4205 * Longer term, all of the dependencies ipv6 has upon the loopback
4206 * device and it being up should be removed.
4207 */
4208 rtnl_lock();
4209 if (!ipv6_add_dev(init_net.loopback_dev))
4210 err = -ENOMEM;
4211 rtnl_unlock();
4212 if (err)
4213 return err;
4214
4215 ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4216 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4217 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4218 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4219 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4220 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4221 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4222 #endif
4223
4224 register_netdevice_notifier(&ipv6_dev_notf);
4225
4226 addrconf_verify(0);
4227
4228 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4229 if (err < 0)
4230 goto errout;
4231
4232 /* Only the first call to __rtnl_register can fail */
4233 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4234 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4235 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4236 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4237 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4238
4239 #ifdef CONFIG_SYSCTL
4240 addrconf_sysctl.sysctl_header =
4241 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
4242 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4243 #endif
4244
4245 return 0;
4246 errout:
4247 unregister_netdevice_notifier(&ipv6_dev_notf);
4248
4249 return err;
4250 }
4251
4252 void __exit addrconf_cleanup(void)
4253 {
4254 struct net_device *dev;
4255 struct inet6_ifaddr *ifa;
4256 int i;
4257
4258 unregister_netdevice_notifier(&ipv6_dev_notf);
4259
4260 #ifdef CONFIG_SYSCTL
4261 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4262 addrconf_sysctl_unregister(&ipv6_devconf);
4263 #endif
4264
4265 rtnl_lock();
4266
4267 /*
4268 * clean dev list.
4269 */
4270
4271 for_each_netdev(&init_net, dev) {
4272 if (__in6_dev_get(dev) == NULL)
4273 continue;
4274 addrconf_ifdown(dev, 1);
4275 }
4276 addrconf_ifdown(init_net.loopback_dev, 2);
4277
4278 /*
4279 * Check hash table.
4280 */
4281
4282 write_lock_bh(&addrconf_hash_lock);
4283 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4284 for (ifa=inet6_addr_lst[i]; ifa; ) {
4285 struct inet6_ifaddr *bifa;
4286
4287 bifa = ifa;
4288 ifa = ifa->lst_next;
4289 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4290 /* Do not free it; something is wrong.
4291 Now we can investigate it with debugger.
4292 */
4293 }
4294 }
4295 write_unlock_bh(&addrconf_hash_lock);
4296
4297 del_timer(&addr_chk_timer);
4298
4299 rtnl_unlock();
4300 }
Linux kernel - Deliverables
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