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[NET]: Convert init_timer into setup_timer
[mirror_ubuntu-eoan-kernel.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 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
370 if ((dev->flags&IFF_LOOPBACK) ||
371 dev->type == ARPHRD_TUNNEL ||
372 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
373 dev->type == ARPHRD_SIT ||
374 #endif
375 dev->type == ARPHRD_NONE) {
376 printk(KERN_INFO
377 "%s: Disabled Privacy Extensions\n",
378 dev->name);
379 ndev->cnf.use_tempaddr = -1;
380 } else {
381 in6_dev_hold(ndev);
382 ipv6_regen_rndid((unsigned long) ndev);
383 }
384 #endif
385
386 if (netif_running(dev) && addrconf_qdisc_ok(dev))
387 ndev->if_flags |= IF_READY;
388
389 ipv6_mc_init_dev(ndev);
390 ndev->tstamp = jiffies;
391 #ifdef CONFIG_SYSCTL
392 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
393 NET_IPV6_NEIGH, "ipv6",
394 &ndisc_ifinfo_sysctl_change,
395 NULL);
396 addrconf_sysctl_register(ndev, &ndev->cnf);
397 #endif
398 /* protected by rtnl_lock */
399 rcu_assign_pointer(dev->ip6_ptr, ndev);
400
401 /* Join all-node multicast group */
402 ipv6_addr_all_nodes(&maddr);
403 ipv6_dev_mc_inc(dev, &maddr);
404
405 return ndev;
406 }
407
408 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
409 {
410 struct inet6_dev *idev;
411
412 ASSERT_RTNL();
413
414 if ((idev = __in6_dev_get(dev)) == NULL) {
415 if ((idev = ipv6_add_dev(dev)) == NULL)
416 return NULL;
417 }
418
419 if (dev->flags&IFF_UP)
420 ipv6_mc_up(idev);
421 return idev;
422 }
423
424 #ifdef CONFIG_SYSCTL
425 static void dev_forward_change(struct inet6_dev *idev)
426 {
427 struct net_device *dev;
428 struct inet6_ifaddr *ifa;
429 struct in6_addr addr;
430
431 if (!idev)
432 return;
433 dev = idev->dev;
434 if (dev && (dev->flags & IFF_MULTICAST)) {
435 ipv6_addr_all_routers(&addr);
436
437 if (idev->cnf.forwarding)
438 ipv6_dev_mc_inc(dev, &addr);
439 else
440 ipv6_dev_mc_dec(dev, &addr);
441 }
442 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
443 if (ifa->flags&IFA_F_TENTATIVE)
444 continue;
445 if (idev->cnf.forwarding)
446 addrconf_join_anycast(ifa);
447 else
448 addrconf_leave_anycast(ifa);
449 }
450 }
451
452
453 static void addrconf_forward_change(void)
454 {
455 struct net_device *dev;
456 struct inet6_dev *idev;
457
458 read_lock(&dev_base_lock);
459 for_each_netdev(&init_net, dev) {
460 rcu_read_lock();
461 idev = __in6_dev_get(dev);
462 if (idev) {
463 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
464 idev->cnf.forwarding = ipv6_devconf.forwarding;
465 if (changed)
466 dev_forward_change(idev);
467 }
468 rcu_read_unlock();
469 }
470 read_unlock(&dev_base_lock);
471 }
472 #endif
473
474 /* Nobody refers to this ifaddr, destroy it */
475
476 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
477 {
478 BUG_TRAP(ifp->if_next==NULL);
479 BUG_TRAP(ifp->lst_next==NULL);
480 #ifdef NET_REFCNT_DEBUG
481 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
482 #endif
483
484 in6_dev_put(ifp->idev);
485
486 if (del_timer(&ifp->timer))
487 printk("Timer is still running, when freeing ifa=%p\n", ifp);
488
489 if (!ifp->dead) {
490 printk("Freeing alive inet6 address %p\n", ifp);
491 return;
492 }
493 dst_release(&ifp->rt->u.dst);
494
495 kfree(ifp);
496 }
497
498 static void
499 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
500 {
501 struct inet6_ifaddr *ifa, **ifap;
502 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
503
504 /*
505 * Each device address list is sorted in order of scope -
506 * global before linklocal.
507 */
508 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
509 ifap = &ifa->if_next) {
510 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
511 break;
512 }
513
514 ifp->if_next = *ifap;
515 *ifap = ifp;
516 }
517
518 /* On success it returns ifp with increased reference count */
519
520 static struct inet6_ifaddr *
521 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
522 int scope, u32 flags)
523 {
524 struct inet6_ifaddr *ifa = NULL;
525 struct rt6_info *rt;
526 int hash;
527 int err = 0;
528
529 rcu_read_lock_bh();
530 if (idev->dead) {
531 err = -ENODEV; /*XXX*/
532 goto out2;
533 }
534
535 write_lock(&addrconf_hash_lock);
536
537 /* Ignore adding duplicate addresses on an interface */
538 if (ipv6_chk_same_addr(addr, idev->dev)) {
539 ADBG(("ipv6_add_addr: already assigned\n"));
540 err = -EEXIST;
541 goto out;
542 }
543
544 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
545
546 if (ifa == NULL) {
547 ADBG(("ipv6_add_addr: malloc failed\n"));
548 err = -ENOBUFS;
549 goto out;
550 }
551
552 rt = addrconf_dst_alloc(idev, addr, 0);
553 if (IS_ERR(rt)) {
554 err = PTR_ERR(rt);
555 goto out;
556 }
557
558 ipv6_addr_copy(&ifa->addr, addr);
559
560 spin_lock_init(&ifa->lock);
561 init_timer(&ifa->timer);
562 ifa->timer.data = (unsigned long) ifa;
563 ifa->scope = scope;
564 ifa->prefix_len = pfxlen;
565 ifa->flags = flags | IFA_F_TENTATIVE;
566 ifa->cstamp = ifa->tstamp = jiffies;
567
568 ifa->rt = rt;
569
570 /*
571 * part one of RFC 4429, section 3.3
572 * We should not configure an address as
573 * optimistic if we do not yet know the link
574 * layer address of our nexhop router
575 */
576
577 if (rt->rt6i_nexthop == NULL)
578 ifa->flags &= ~IFA_F_OPTIMISTIC;
579
580 ifa->idev = idev;
581 in6_dev_hold(idev);
582 /* For caller */
583 in6_ifa_hold(ifa);
584
585 /* Add to big hash table */
586 hash = ipv6_addr_hash(addr);
587
588 ifa->lst_next = inet6_addr_lst[hash];
589 inet6_addr_lst[hash] = ifa;
590 in6_ifa_hold(ifa);
591 write_unlock(&addrconf_hash_lock);
592
593 write_lock(&idev->lock);
594 /* Add to inet6_dev unicast addr list. */
595 ipv6_link_dev_addr(idev, ifa);
596
597 #ifdef CONFIG_IPV6_PRIVACY
598 if (ifa->flags&IFA_F_TEMPORARY) {
599 ifa->tmp_next = idev->tempaddr_list;
600 idev->tempaddr_list = ifa;
601 in6_ifa_hold(ifa);
602 }
603 #endif
604
605 in6_ifa_hold(ifa);
606 write_unlock(&idev->lock);
607 out2:
608 rcu_read_unlock_bh();
609
610 if (likely(err == 0))
611 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
612 else {
613 kfree(ifa);
614 ifa = ERR_PTR(err);
615 }
616
617 return ifa;
618 out:
619 write_unlock(&addrconf_hash_lock);
620 goto out2;
621 }
622
623 /* This function wants to get referenced ifp and releases it before return */
624
625 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
626 {
627 struct inet6_ifaddr *ifa, **ifap;
628 struct inet6_dev *idev = ifp->idev;
629 int hash;
630 int deleted = 0, onlink = 0;
631 unsigned long expires = jiffies;
632
633 hash = ipv6_addr_hash(&ifp->addr);
634
635 ifp->dead = 1;
636
637 write_lock_bh(&addrconf_hash_lock);
638 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
639 ifap = &ifa->lst_next) {
640 if (ifa == ifp) {
641 *ifap = ifa->lst_next;
642 __in6_ifa_put(ifp);
643 ifa->lst_next = NULL;
644 break;
645 }
646 }
647 write_unlock_bh(&addrconf_hash_lock);
648
649 write_lock_bh(&idev->lock);
650 #ifdef CONFIG_IPV6_PRIVACY
651 if (ifp->flags&IFA_F_TEMPORARY) {
652 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
653 ifap = &ifa->tmp_next) {
654 if (ifa == ifp) {
655 *ifap = ifa->tmp_next;
656 if (ifp->ifpub) {
657 in6_ifa_put(ifp->ifpub);
658 ifp->ifpub = NULL;
659 }
660 __in6_ifa_put(ifp);
661 ifa->tmp_next = NULL;
662 break;
663 }
664 }
665 }
666 #endif
667
668 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
669 if (ifa == ifp) {
670 *ifap = ifa->if_next;
671 __in6_ifa_put(ifp);
672 ifa->if_next = NULL;
673 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
674 break;
675 deleted = 1;
676 continue;
677 } else if (ifp->flags & IFA_F_PERMANENT) {
678 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
679 ifp->prefix_len)) {
680 if (ifa->flags & IFA_F_PERMANENT) {
681 onlink = 1;
682 if (deleted)
683 break;
684 } else {
685 unsigned long lifetime;
686
687 if (!onlink)
688 onlink = -1;
689
690 spin_lock(&ifa->lock);
691 lifetime = min_t(unsigned long,
692 ifa->valid_lft, 0x7fffffffUL/HZ);
693 if (time_before(expires,
694 ifa->tstamp + lifetime * HZ))
695 expires = ifa->tstamp + lifetime * HZ;
696 spin_unlock(&ifa->lock);
697 }
698 }
699 }
700 ifap = &ifa->if_next;
701 }
702 write_unlock_bh(&idev->lock);
703
704 ipv6_ifa_notify(RTM_DELADDR, ifp);
705
706 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
707
708 addrconf_del_timer(ifp);
709
710 /*
711 * Purge or update corresponding prefix
712 *
713 * 1) we don't purge prefix here if address was not permanent.
714 * prefix is managed by its own lifetime.
715 * 2) if there're no addresses, delete prefix.
716 * 3) if there're still other permanent address(es),
717 * corresponding prefix is still permanent.
718 * 4) otherwise, update prefix lifetime to the
719 * longest valid lifetime among the corresponding
720 * addresses on the device.
721 * Note: subsequent RA will update lifetime.
722 *
723 * --yoshfuji
724 */
725 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
726 struct in6_addr prefix;
727 struct rt6_info *rt;
728
729 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
730 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
731
732 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
733 if (onlink == 0) {
734 ip6_del_rt(rt);
735 rt = NULL;
736 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
737 rt->rt6i_expires = expires;
738 rt->rt6i_flags |= RTF_EXPIRES;
739 }
740 }
741 dst_release(&rt->u.dst);
742 }
743
744 in6_ifa_put(ifp);
745 }
746
747 #ifdef CONFIG_IPV6_PRIVACY
748 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
749 {
750 struct inet6_dev *idev = ifp->idev;
751 struct in6_addr addr, *tmpaddr;
752 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
753 int tmp_plen;
754 int ret = 0;
755 int max_addresses;
756 u32 addr_flags;
757
758 write_lock(&idev->lock);
759 if (ift) {
760 spin_lock_bh(&ift->lock);
761 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
762 spin_unlock_bh(&ift->lock);
763 tmpaddr = &addr;
764 } else {
765 tmpaddr = NULL;
766 }
767 retry:
768 in6_dev_hold(idev);
769 if (idev->cnf.use_tempaddr <= 0) {
770 write_unlock(&idev->lock);
771 printk(KERN_INFO
772 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
773 in6_dev_put(idev);
774 ret = -1;
775 goto out;
776 }
777 spin_lock_bh(&ifp->lock);
778 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
779 idev->cnf.use_tempaddr = -1; /*XXX*/
780 spin_unlock_bh(&ifp->lock);
781 write_unlock(&idev->lock);
782 printk(KERN_WARNING
783 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
784 in6_dev_put(idev);
785 ret = -1;
786 goto out;
787 }
788 in6_ifa_hold(ifp);
789 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
790 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
791 spin_unlock_bh(&ifp->lock);
792 write_unlock(&idev->lock);
793 printk(KERN_WARNING
794 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
795 in6_ifa_put(ifp);
796 in6_dev_put(idev);
797 ret = -1;
798 goto out;
799 }
800 memcpy(&addr.s6_addr[8], idev->rndid, 8);
801 tmp_valid_lft = min_t(__u32,
802 ifp->valid_lft,
803 idev->cnf.temp_valid_lft);
804 tmp_prefered_lft = min_t(__u32,
805 ifp->prefered_lft,
806 idev->cnf.temp_prefered_lft - desync_factor / HZ);
807 tmp_plen = ifp->prefix_len;
808 max_addresses = idev->cnf.max_addresses;
809 tmp_cstamp = ifp->cstamp;
810 tmp_tstamp = ifp->tstamp;
811 spin_unlock_bh(&ifp->lock);
812
813 write_unlock(&idev->lock);
814
815 addr_flags = IFA_F_TEMPORARY;
816 /* set in addrconf_prefix_rcv() */
817 if (ifp->flags & IFA_F_OPTIMISTIC)
818 addr_flags |= IFA_F_OPTIMISTIC;
819
820 ift = !max_addresses ||
821 ipv6_count_addresses(idev) < max_addresses ?
822 ipv6_add_addr(idev, &addr, tmp_plen,
823 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
824 addr_flags) : NULL;
825 if (!ift || IS_ERR(ift)) {
826 in6_ifa_put(ifp);
827 in6_dev_put(idev);
828 printk(KERN_INFO
829 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
830 tmpaddr = &addr;
831 write_lock(&idev->lock);
832 goto retry;
833 }
834
835 spin_lock_bh(&ift->lock);
836 ift->ifpub = ifp;
837 ift->valid_lft = tmp_valid_lft;
838 ift->prefered_lft = tmp_prefered_lft;
839 ift->cstamp = tmp_cstamp;
840 ift->tstamp = tmp_tstamp;
841 spin_unlock_bh(&ift->lock);
842
843 addrconf_dad_start(ift, 0);
844 in6_ifa_put(ift);
845 in6_dev_put(idev);
846 out:
847 return ret;
848 }
849 #endif
850
851 /*
852 * Choose an appropriate source address (RFC3484)
853 */
854 struct ipv6_saddr_score {
855 int addr_type;
856 unsigned int attrs;
857 int matchlen;
858 int scope;
859 unsigned int rule;
860 };
861
862 #define IPV6_SADDR_SCORE_LOCAL 0x0001
863 #define IPV6_SADDR_SCORE_PREFERRED 0x0004
864 #define IPV6_SADDR_SCORE_HOA 0x0008
865 #define IPV6_SADDR_SCORE_OIF 0x0010
866 #define IPV6_SADDR_SCORE_LABEL 0x0020
867 #define IPV6_SADDR_SCORE_PRIVACY 0x0040
868
869 static inline int ipv6_saddr_preferred(int type)
870 {
871 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
872 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
873 return 1;
874 return 0;
875 }
876
877 /* static matching label */
878 static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
879 {
880 /*
881 * prefix (longest match) label
882 * -----------------------------
883 * ::1/128 0
884 * ::/0 1
885 * 2002::/16 2
886 * ::/96 3
887 * ::ffff:0:0/96 4
888 * fc00::/7 5
889 * 2001::/32 6
890 */
891 if (type & IPV6_ADDR_LOOPBACK)
892 return 0;
893 else if (type & IPV6_ADDR_COMPATv4)
894 return 3;
895 else if (type & IPV6_ADDR_MAPPED)
896 return 4;
897 else if (addr->s6_addr32[0] == htonl(0x20010000))
898 return 6;
899 else if (addr->s6_addr16[0] == htons(0x2002))
900 return 2;
901 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
902 return 5;
903 return 1;
904 }
905
906 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
907 struct in6_addr *daddr, struct in6_addr *saddr)
908 {
909 struct ipv6_saddr_score hiscore;
910 struct inet6_ifaddr *ifa_result = NULL;
911 int daddr_type = __ipv6_addr_type(daddr);
912 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
913 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
914 struct net_device *dev;
915
916 memset(&hiscore, 0, sizeof(hiscore));
917
918 read_lock(&dev_base_lock);
919 rcu_read_lock();
920
921 for_each_netdev(&init_net, dev) {
922 struct inet6_dev *idev;
923 struct inet6_ifaddr *ifa;
924
925 /* Rule 0: Candidate Source Address (section 4)
926 * - multicast and link-local destination address,
927 * the set of candidate source address MUST only
928 * include addresses assigned to interfaces
929 * belonging to the same link as the outgoing
930 * interface.
931 * (- For site-local destination addresses, the
932 * set of candidate source addresses MUST only
933 * include addresses assigned to interfaces
934 * belonging to the same site as the outgoing
935 * interface.)
936 */
937 if ((daddr_type & IPV6_ADDR_MULTICAST ||
938 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
939 daddr_dev && dev != daddr_dev)
940 continue;
941
942 idev = __in6_dev_get(dev);
943 if (!idev)
944 continue;
945
946 read_lock_bh(&idev->lock);
947 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
948 struct ipv6_saddr_score score;
949
950 score.addr_type = __ipv6_addr_type(&ifa->addr);
951
952 /* Rule 0:
953 * - Tentative Address (RFC2462 section 5.4)
954 * - A tentative address is not considered
955 * "assigned to an interface" in the traditional
956 * sense, unless it is also flagged as optimistic.
957 * - Candidate Source Address (section 4)
958 * - In any case, anycast addresses, multicast
959 * addresses, and the unspecified address MUST
960 * NOT be included in a candidate set.
961 */
962 if ((ifa->flags & IFA_F_TENTATIVE) &&
963 (!(ifa->flags & IFA_F_OPTIMISTIC)))
964 continue;
965 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
966 score.addr_type & IPV6_ADDR_MULTICAST)) {
967 LIMIT_NETDEBUG(KERN_DEBUG
968 "ADDRCONF: unspecified / multicast address "
969 "assigned as unicast address on %s",
970 dev->name);
971 continue;
972 }
973
974 score.attrs = 0;
975 score.matchlen = 0;
976 score.scope = 0;
977 score.rule = 0;
978
979 if (ifa_result == NULL) {
980 /* record it if the first available entry */
981 goto record_it;
982 }
983
984 /* Rule 1: Prefer same address */
985 if (hiscore.rule < 1) {
986 if (ipv6_addr_equal(&ifa_result->addr, daddr))
987 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
988 hiscore.rule++;
989 }
990 if (ipv6_addr_equal(&ifa->addr, daddr)) {
991 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
992 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
993 score.rule = 1;
994 goto record_it;
995 }
996 } else {
997 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
998 continue;
999 }
1000
1001 /* Rule 2: Prefer appropriate scope */
1002 if (hiscore.rule < 2) {
1003 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1004 hiscore.rule++;
1005 }
1006 score.scope = __ipv6_addr_src_scope(score.addr_type);
1007 if (hiscore.scope < score.scope) {
1008 if (hiscore.scope < daddr_scope) {
1009 score.rule = 2;
1010 goto record_it;
1011 } else
1012 continue;
1013 } else if (score.scope < hiscore.scope) {
1014 if (score.scope < daddr_scope)
1015 break; /* addresses sorted by scope */
1016 else {
1017 score.rule = 2;
1018 goto record_it;
1019 }
1020 }
1021
1022 /* Rule 3: Avoid deprecated and optimistic addresses */
1023 if (hiscore.rule < 3) {
1024 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1025 (((ifa_result->flags &
1026 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1027 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1028 hiscore.rule++;
1029 }
1030 if (ipv6_saddr_preferred(score.addr_type) ||
1031 (((ifa->flags &
1032 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1033 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1034 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1035 score.rule = 3;
1036 goto record_it;
1037 }
1038 } else {
1039 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1040 continue;
1041 }
1042
1043 /* Rule 4: Prefer home address */
1044 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1045 if (hiscore.rule < 4) {
1046 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1047 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1048 hiscore.rule++;
1049 }
1050 if (ifa->flags & IFA_F_HOMEADDRESS) {
1051 score.attrs |= IPV6_SADDR_SCORE_HOA;
1052 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1053 score.rule = 4;
1054 goto record_it;
1055 }
1056 } else {
1057 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1058 continue;
1059 }
1060 #else
1061 if (hiscore.rule < 4)
1062 hiscore.rule++;
1063 #endif
1064
1065 /* Rule 5: Prefer outgoing interface */
1066 if (hiscore.rule < 5) {
1067 if (daddr_dev == NULL ||
1068 daddr_dev == ifa_result->idev->dev)
1069 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1070 hiscore.rule++;
1071 }
1072 if (daddr_dev == NULL ||
1073 daddr_dev == ifa->idev->dev) {
1074 score.attrs |= IPV6_SADDR_SCORE_OIF;
1075 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1076 score.rule = 5;
1077 goto record_it;
1078 }
1079 } else {
1080 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1081 continue;
1082 }
1083
1084 /* Rule 6: Prefer matching label */
1085 if (hiscore.rule < 6) {
1086 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1087 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1088 hiscore.rule++;
1089 }
1090 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1091 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1092 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1093 score.rule = 6;
1094 goto record_it;
1095 }
1096 } else {
1097 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1098 continue;
1099 }
1100
1101 #ifdef CONFIG_IPV6_PRIVACY
1102 /* Rule 7: Prefer public address
1103 * Note: prefer temprary address if use_tempaddr >= 2
1104 */
1105 if (hiscore.rule < 7) {
1106 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1107 (ifa_result->idev->cnf.use_tempaddr >= 2))
1108 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1109 hiscore.rule++;
1110 }
1111 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1112 (ifa->idev->cnf.use_tempaddr >= 2)) {
1113 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1114 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1115 score.rule = 7;
1116 goto record_it;
1117 }
1118 } else {
1119 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1120 continue;
1121 }
1122 #else
1123 if (hiscore.rule < 7)
1124 hiscore.rule++;
1125 #endif
1126 /* Rule 8: Use longest matching prefix */
1127 if (hiscore.rule < 8) {
1128 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1129 hiscore.rule++;
1130 }
1131 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1132 if (score.matchlen > hiscore.matchlen) {
1133 score.rule = 8;
1134 goto record_it;
1135 }
1136 #if 0
1137 else if (score.matchlen < hiscore.matchlen)
1138 continue;
1139 #endif
1140
1141 /* Final Rule: choose first available one */
1142 continue;
1143 record_it:
1144 if (ifa_result)
1145 in6_ifa_put(ifa_result);
1146 in6_ifa_hold(ifa);
1147 ifa_result = ifa;
1148 hiscore = score;
1149 }
1150 read_unlock_bh(&idev->lock);
1151 }
1152 rcu_read_unlock();
1153 read_unlock(&dev_base_lock);
1154
1155 if (!ifa_result)
1156 return -EADDRNOTAVAIL;
1157
1158 ipv6_addr_copy(saddr, &ifa_result->addr);
1159 in6_ifa_put(ifa_result);
1160 return 0;
1161 }
1162
1163
1164 int ipv6_get_saddr(struct dst_entry *dst,
1165 struct in6_addr *daddr, struct in6_addr *saddr)
1166 {
1167 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1168 }
1169
1170 EXPORT_SYMBOL(ipv6_get_saddr);
1171
1172 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1173 unsigned char banned_flags)
1174 {
1175 struct inet6_dev *idev;
1176 int err = -EADDRNOTAVAIL;
1177
1178 rcu_read_lock();
1179 if ((idev = __in6_dev_get(dev)) != NULL) {
1180 struct inet6_ifaddr *ifp;
1181
1182 read_lock_bh(&idev->lock);
1183 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1184 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1185 ipv6_addr_copy(addr, &ifp->addr);
1186 err = 0;
1187 break;
1188 }
1189 }
1190 read_unlock_bh(&idev->lock);
1191 }
1192 rcu_read_unlock();
1193 return err;
1194 }
1195
1196 static int ipv6_count_addresses(struct inet6_dev *idev)
1197 {
1198 int cnt = 0;
1199 struct inet6_ifaddr *ifp;
1200
1201 read_lock_bh(&idev->lock);
1202 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1203 cnt++;
1204 read_unlock_bh(&idev->lock);
1205 return cnt;
1206 }
1207
1208 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1209 {
1210 struct inet6_ifaddr * ifp;
1211 u8 hash = ipv6_addr_hash(addr);
1212
1213 read_lock_bh(&addrconf_hash_lock);
1214 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1215 if (ipv6_addr_equal(&ifp->addr, addr) &&
1216 !(ifp->flags&IFA_F_TENTATIVE)) {
1217 if (dev == NULL || ifp->idev->dev == dev ||
1218 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1219 break;
1220 }
1221 }
1222 read_unlock_bh(&addrconf_hash_lock);
1223 return ifp != NULL;
1224 }
1225
1226 EXPORT_SYMBOL(ipv6_chk_addr);
1227
1228 static
1229 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1230 {
1231 struct inet6_ifaddr * ifp;
1232 u8 hash = ipv6_addr_hash(addr);
1233
1234 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1235 if (ipv6_addr_equal(&ifp->addr, addr)) {
1236 if (dev == NULL || ifp->idev->dev == dev)
1237 break;
1238 }
1239 }
1240 return ifp != NULL;
1241 }
1242
1243 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1244 {
1245 struct inet6_ifaddr * ifp;
1246 u8 hash = ipv6_addr_hash(addr);
1247
1248 read_lock_bh(&addrconf_hash_lock);
1249 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1250 if (ipv6_addr_equal(&ifp->addr, addr)) {
1251 if (dev == NULL || ifp->idev->dev == dev ||
1252 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1253 in6_ifa_hold(ifp);
1254 break;
1255 }
1256 }
1257 }
1258 read_unlock_bh(&addrconf_hash_lock);
1259
1260 return ifp;
1261 }
1262
1263 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1264 {
1265 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1266 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1267 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1268 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1269 int sk_ipv6only = ipv6_only_sock(sk);
1270 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1271 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1272 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1273
1274 if (!sk2_rcv_saddr && !sk_ipv6only)
1275 return 1;
1276
1277 if (addr_type2 == IPV6_ADDR_ANY &&
1278 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1279 return 1;
1280
1281 if (addr_type == IPV6_ADDR_ANY &&
1282 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1283 return 1;
1284
1285 if (sk2_rcv_saddr6 &&
1286 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1287 return 1;
1288
1289 if (addr_type == IPV6_ADDR_MAPPED &&
1290 !sk2_ipv6only &&
1291 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1292 return 1;
1293
1294 return 0;
1295 }
1296
1297 /* Gets referenced address, destroys ifaddr */
1298
1299 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1300 {
1301 if (ifp->flags&IFA_F_PERMANENT) {
1302 spin_lock_bh(&ifp->lock);
1303 addrconf_del_timer(ifp);
1304 ifp->flags |= IFA_F_TENTATIVE;
1305 spin_unlock_bh(&ifp->lock);
1306 in6_ifa_put(ifp);
1307 #ifdef CONFIG_IPV6_PRIVACY
1308 } else if (ifp->flags&IFA_F_TEMPORARY) {
1309 struct inet6_ifaddr *ifpub;
1310 spin_lock_bh(&ifp->lock);
1311 ifpub = ifp->ifpub;
1312 if (ifpub) {
1313 in6_ifa_hold(ifpub);
1314 spin_unlock_bh(&ifp->lock);
1315 ipv6_create_tempaddr(ifpub, ifp);
1316 in6_ifa_put(ifpub);
1317 } else {
1318 spin_unlock_bh(&ifp->lock);
1319 }
1320 ipv6_del_addr(ifp);
1321 #endif
1322 } else
1323 ipv6_del_addr(ifp);
1324 }
1325
1326 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1327 {
1328 if (net_ratelimit())
1329 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1330 addrconf_dad_stop(ifp);
1331 }
1332
1333 /* Join to solicited addr multicast group. */
1334
1335 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1336 {
1337 struct in6_addr maddr;
1338
1339 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1340 return;
1341
1342 addrconf_addr_solict_mult(addr, &maddr);
1343 ipv6_dev_mc_inc(dev, &maddr);
1344 }
1345
1346 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1347 {
1348 struct in6_addr maddr;
1349
1350 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1351 return;
1352
1353 addrconf_addr_solict_mult(addr, &maddr);
1354 __ipv6_dev_mc_dec(idev, &maddr);
1355 }
1356
1357 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1358 {
1359 struct in6_addr addr;
1360 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1361 if (ipv6_addr_any(&addr))
1362 return;
1363 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1364 }
1365
1366 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1367 {
1368 struct in6_addr addr;
1369 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1370 if (ipv6_addr_any(&addr))
1371 return;
1372 __ipv6_dev_ac_dec(ifp->idev, &addr);
1373 }
1374
1375 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1376 {
1377 if (dev->addr_len != ETH_ALEN)
1378 return -1;
1379 memcpy(eui, dev->dev_addr, 3);
1380 memcpy(eui + 5, dev->dev_addr + 3, 3);
1381
1382 /*
1383 * The zSeries OSA network cards can be shared among various
1384 * OS instances, but the OSA cards have only one MAC address.
1385 * This leads to duplicate address conflicts in conjunction
1386 * with IPv6 if more than one instance uses the same card.
1387 *
1388 * The driver for these cards can deliver a unique 16-bit
1389 * identifier for each instance sharing the same card. It is
1390 * placed instead of 0xFFFE in the interface identifier. The
1391 * "u" bit of the interface identifier is not inverted in this
1392 * case. Hence the resulting interface identifier has local
1393 * scope according to RFC2373.
1394 */
1395 if (dev->dev_id) {
1396 eui[3] = (dev->dev_id >> 8) & 0xFF;
1397 eui[4] = dev->dev_id & 0xFF;
1398 } else {
1399 eui[3] = 0xFF;
1400 eui[4] = 0xFE;
1401 eui[0] ^= 2;
1402 }
1403 return 0;
1404 }
1405
1406 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1407 {
1408 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1409 if (dev->addr_len != ARCNET_ALEN)
1410 return -1;
1411 memset(eui, 0, 7);
1412 eui[7] = *(u8*)dev->dev_addr;
1413 return 0;
1414 }
1415
1416 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1417 {
1418 if (dev->addr_len != INFINIBAND_ALEN)
1419 return -1;
1420 memcpy(eui, dev->dev_addr + 12, 8);
1421 eui[0] |= 2;
1422 return 0;
1423 }
1424
1425 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1426 {
1427 switch (dev->type) {
1428 case ARPHRD_ETHER:
1429 case ARPHRD_FDDI:
1430 case ARPHRD_IEEE802_TR:
1431 return addrconf_ifid_eui48(eui, dev);
1432 case ARPHRD_ARCNET:
1433 return addrconf_ifid_arcnet(eui, dev);
1434 case ARPHRD_INFINIBAND:
1435 return addrconf_ifid_infiniband(eui, dev);
1436 }
1437 return -1;
1438 }
1439
1440 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1441 {
1442 int err = -1;
1443 struct inet6_ifaddr *ifp;
1444
1445 read_lock_bh(&idev->lock);
1446 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1447 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1448 memcpy(eui, ifp->addr.s6_addr+8, 8);
1449 err = 0;
1450 break;
1451 }
1452 }
1453 read_unlock_bh(&idev->lock);
1454 return err;
1455 }
1456
1457 #ifdef CONFIG_IPV6_PRIVACY
1458 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1459 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1460 {
1461 regen:
1462 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1463 idev->rndid[0] &= ~0x02;
1464
1465 /*
1466 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1467 * check if generated address is not inappropriate
1468 *
1469 * - Reserved subnet anycast (RFC 2526)
1470 * 11111101 11....11 1xxxxxxx
1471 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1472 * 00-00-5E-FE-xx-xx-xx-xx
1473 * - value 0
1474 * - XXX: already assigned to an address on the device
1475 */
1476 if (idev->rndid[0] == 0xfd &&
1477 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1478 (idev->rndid[7]&0x80))
1479 goto regen;
1480 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1481 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1482 goto regen;
1483 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1484 goto regen;
1485 }
1486
1487 return 0;
1488 }
1489
1490 static void ipv6_regen_rndid(unsigned long data)
1491 {
1492 struct inet6_dev *idev = (struct inet6_dev *) data;
1493 unsigned long expires;
1494
1495 rcu_read_lock_bh();
1496 write_lock_bh(&idev->lock);
1497
1498 if (idev->dead)
1499 goto out;
1500
1501 if (__ipv6_regen_rndid(idev) < 0)
1502 goto out;
1503
1504 expires = jiffies +
1505 idev->cnf.temp_prefered_lft * HZ -
1506 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1507 if (time_before(expires, jiffies)) {
1508 printk(KERN_WARNING
1509 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1510 idev->dev->name);
1511 goto out;
1512 }
1513
1514 if (!mod_timer(&idev->regen_timer, expires))
1515 in6_dev_hold(idev);
1516
1517 out:
1518 write_unlock_bh(&idev->lock);
1519 rcu_read_unlock_bh();
1520 in6_dev_put(idev);
1521 }
1522
1523 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1524 int ret = 0;
1525
1526 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1527 ret = __ipv6_regen_rndid(idev);
1528 return ret;
1529 }
1530 #endif
1531
1532 /*
1533 * Add prefix route.
1534 */
1535
1536 static void
1537 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1538 unsigned long expires, u32 flags)
1539 {
1540 struct fib6_config cfg = {
1541 .fc_table = RT6_TABLE_PREFIX,
1542 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1543 .fc_ifindex = dev->ifindex,
1544 .fc_expires = expires,
1545 .fc_dst_len = plen,
1546 .fc_flags = RTF_UP | flags,
1547 };
1548
1549 ipv6_addr_copy(&cfg.fc_dst, pfx);
1550
1551 /* Prevent useless cloning on PtP SIT.
1552 This thing is done here expecting that the whole
1553 class of non-broadcast devices need not cloning.
1554 */
1555 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1556 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1557 cfg.fc_flags |= RTF_NONEXTHOP;
1558 #endif
1559
1560 ip6_route_add(&cfg);
1561 }
1562
1563 /* Create "default" multicast route to the interface */
1564
1565 static void addrconf_add_mroute(struct net_device *dev)
1566 {
1567 struct fib6_config cfg = {
1568 .fc_table = RT6_TABLE_LOCAL,
1569 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1570 .fc_ifindex = dev->ifindex,
1571 .fc_dst_len = 8,
1572 .fc_flags = RTF_UP,
1573 };
1574
1575 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1576
1577 ip6_route_add(&cfg);
1578 }
1579
1580 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1581 static void sit_route_add(struct net_device *dev)
1582 {
1583 struct fib6_config cfg = {
1584 .fc_table = RT6_TABLE_MAIN,
1585 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1586 .fc_ifindex = dev->ifindex,
1587 .fc_dst_len = 96,
1588 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1589 };
1590
1591 /* prefix length - 96 bits "::d.d.d.d" */
1592 ip6_route_add(&cfg);
1593 }
1594 #endif
1595
1596 static void addrconf_add_lroute(struct net_device *dev)
1597 {
1598 struct in6_addr addr;
1599
1600 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1601 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1602 }
1603
1604 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1605 {
1606 struct inet6_dev *idev;
1607
1608 ASSERT_RTNL();
1609
1610 if ((idev = ipv6_find_idev(dev)) == NULL)
1611 return NULL;
1612
1613 /* Add default multicast route */
1614 addrconf_add_mroute(dev);
1615
1616 /* Add link local route */
1617 addrconf_add_lroute(dev);
1618 return idev;
1619 }
1620
1621 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1622 {
1623 struct prefix_info *pinfo;
1624 __u32 valid_lft;
1625 __u32 prefered_lft;
1626 int addr_type;
1627 unsigned long rt_expires;
1628 struct inet6_dev *in6_dev;
1629
1630 pinfo = (struct prefix_info *) opt;
1631
1632 if (len < sizeof(struct prefix_info)) {
1633 ADBG(("addrconf: prefix option too short\n"));
1634 return;
1635 }
1636
1637 /*
1638 * Validation checks ([ADDRCONF], page 19)
1639 */
1640
1641 addr_type = ipv6_addr_type(&pinfo->prefix);
1642
1643 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1644 return;
1645
1646 valid_lft = ntohl(pinfo->valid);
1647 prefered_lft = ntohl(pinfo->prefered);
1648
1649 if (prefered_lft > valid_lft) {
1650 if (net_ratelimit())
1651 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1652 return;
1653 }
1654
1655 in6_dev = in6_dev_get(dev);
1656
1657 if (in6_dev == NULL) {
1658 if (net_ratelimit())
1659 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1660 return;
1661 }
1662
1663 /*
1664 * Two things going on here:
1665 * 1) Add routes for on-link prefixes
1666 * 2) Configure prefixes with the auto flag set
1667 */
1668
1669 /* Avoid arithmetic overflow. Really, we could
1670 save rt_expires in seconds, likely valid_lft,
1671 but it would require division in fib gc, that it
1672 not good.
1673 */
1674 if (valid_lft >= 0x7FFFFFFF/HZ)
1675 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1676 else
1677 rt_expires = valid_lft * HZ;
1678
1679 /*
1680 * We convert this (in jiffies) to clock_t later.
1681 * Avoid arithmetic overflow there as well.
1682 * Overflow can happen only if HZ < USER_HZ.
1683 */
1684 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1685 rt_expires = 0x7FFFFFFF / USER_HZ;
1686
1687 if (pinfo->onlink) {
1688 struct rt6_info *rt;
1689 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1690
1691 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1692 if (rt->rt6i_flags&RTF_EXPIRES) {
1693 if (valid_lft == 0) {
1694 ip6_del_rt(rt);
1695 rt = NULL;
1696 } else {
1697 rt->rt6i_expires = jiffies + rt_expires;
1698 }
1699 }
1700 } else if (valid_lft) {
1701 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1702 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1703 }
1704 if (rt)
1705 dst_release(&rt->u.dst);
1706 }
1707
1708 /* Try to figure out our local address for this prefix */
1709
1710 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1711 struct inet6_ifaddr * ifp;
1712 struct in6_addr addr;
1713 int create = 0, update_lft = 0;
1714
1715 if (pinfo->prefix_len == 64) {
1716 memcpy(&addr, &pinfo->prefix, 8);
1717 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1718 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1719 in6_dev_put(in6_dev);
1720 return;
1721 }
1722 goto ok;
1723 }
1724 if (net_ratelimit())
1725 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1726 pinfo->prefix_len);
1727 in6_dev_put(in6_dev);
1728 return;
1729
1730 ok:
1731
1732 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1733
1734 if (ifp == NULL && valid_lft) {
1735 int max_addresses = in6_dev->cnf.max_addresses;
1736 u32 addr_flags = 0;
1737
1738 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1739 if (in6_dev->cnf.optimistic_dad &&
1740 !ipv6_devconf.forwarding)
1741 addr_flags = IFA_F_OPTIMISTIC;
1742 #endif
1743
1744 /* Do not allow to create too much of autoconfigured
1745 * addresses; this would be too easy way to crash kernel.
1746 */
1747 if (!max_addresses ||
1748 ipv6_count_addresses(in6_dev) < max_addresses)
1749 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1750 addr_type&IPV6_ADDR_SCOPE_MASK,
1751 addr_flags);
1752
1753 if (!ifp || IS_ERR(ifp)) {
1754 in6_dev_put(in6_dev);
1755 return;
1756 }
1757
1758 update_lft = create = 1;
1759 ifp->cstamp = jiffies;
1760 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1761 }
1762
1763 if (ifp) {
1764 int flags;
1765 unsigned long now;
1766 #ifdef CONFIG_IPV6_PRIVACY
1767 struct inet6_ifaddr *ift;
1768 #endif
1769 u32 stored_lft;
1770
1771 /* update lifetime (RFC2462 5.5.3 e) */
1772 spin_lock(&ifp->lock);
1773 now = jiffies;
1774 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1775 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1776 else
1777 stored_lft = 0;
1778 if (!update_lft && stored_lft) {
1779 if (valid_lft > MIN_VALID_LIFETIME ||
1780 valid_lft > stored_lft)
1781 update_lft = 1;
1782 else if (stored_lft <= MIN_VALID_LIFETIME) {
1783 /* valid_lft <= stored_lft is always true */
1784 /* XXX: IPsec */
1785 update_lft = 0;
1786 } else {
1787 valid_lft = MIN_VALID_LIFETIME;
1788 if (valid_lft < prefered_lft)
1789 prefered_lft = valid_lft;
1790 update_lft = 1;
1791 }
1792 }
1793
1794 if (update_lft) {
1795 ifp->valid_lft = valid_lft;
1796 ifp->prefered_lft = prefered_lft;
1797 ifp->tstamp = now;
1798 flags = ifp->flags;
1799 ifp->flags &= ~IFA_F_DEPRECATED;
1800 spin_unlock(&ifp->lock);
1801
1802 if (!(flags&IFA_F_TENTATIVE))
1803 ipv6_ifa_notify(0, ifp);
1804 } else
1805 spin_unlock(&ifp->lock);
1806
1807 #ifdef CONFIG_IPV6_PRIVACY
1808 read_lock_bh(&in6_dev->lock);
1809 /* update all temporary addresses in the list */
1810 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1811 /*
1812 * When adjusting the lifetimes of an existing
1813 * temporary address, only lower the lifetimes.
1814 * Implementations must not increase the
1815 * lifetimes of an existing temporary address
1816 * when processing a Prefix Information Option.
1817 */
1818 spin_lock(&ift->lock);
1819 flags = ift->flags;
1820 if (ift->valid_lft > valid_lft &&
1821 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1822 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1823 if (ift->prefered_lft > prefered_lft &&
1824 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1825 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1826 spin_unlock(&ift->lock);
1827 if (!(flags&IFA_F_TENTATIVE))
1828 ipv6_ifa_notify(0, ift);
1829 }
1830
1831 if (create && in6_dev->cnf.use_tempaddr > 0) {
1832 /*
1833 * When a new public address is created as described in [ADDRCONF],
1834 * also create a new temporary address.
1835 */
1836 read_unlock_bh(&in6_dev->lock);
1837 ipv6_create_tempaddr(ifp, NULL);
1838 } else {
1839 read_unlock_bh(&in6_dev->lock);
1840 }
1841 #endif
1842 in6_ifa_put(ifp);
1843 addrconf_verify(0);
1844 }
1845 }
1846 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1847 in6_dev_put(in6_dev);
1848 }
1849
1850 /*
1851 * Set destination address.
1852 * Special case for SIT interfaces where we create a new "virtual"
1853 * device.
1854 */
1855 int addrconf_set_dstaddr(void __user *arg)
1856 {
1857 struct in6_ifreq ireq;
1858 struct net_device *dev;
1859 int err = -EINVAL;
1860
1861 rtnl_lock();
1862
1863 err = -EFAULT;
1864 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1865 goto err_exit;
1866
1867 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1868
1869 err = -ENODEV;
1870 if (dev == NULL)
1871 goto err_exit;
1872
1873 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1874 if (dev->type == ARPHRD_SIT) {
1875 struct ifreq ifr;
1876 mm_segment_t oldfs;
1877 struct ip_tunnel_parm p;
1878
1879 err = -EADDRNOTAVAIL;
1880 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1881 goto err_exit;
1882
1883 memset(&p, 0, sizeof(p));
1884 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1885 p.iph.saddr = 0;
1886 p.iph.version = 4;
1887 p.iph.ihl = 5;
1888 p.iph.protocol = IPPROTO_IPV6;
1889 p.iph.ttl = 64;
1890 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1891
1892 oldfs = get_fs(); set_fs(KERNEL_DS);
1893 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1894 set_fs(oldfs);
1895
1896 if (err == 0) {
1897 err = -ENOBUFS;
1898 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1899 goto err_exit;
1900 err = dev_open(dev);
1901 }
1902 }
1903 #endif
1904
1905 err_exit:
1906 rtnl_unlock();
1907 return err;
1908 }
1909
1910 /*
1911 * Manual configuration of address on an interface
1912 */
1913 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1914 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1915 {
1916 struct inet6_ifaddr *ifp;
1917 struct inet6_dev *idev;
1918 struct net_device *dev;
1919 int scope;
1920 u32 flags = RTF_EXPIRES;
1921
1922 ASSERT_RTNL();
1923
1924 /* check the lifetime */
1925 if (!valid_lft || prefered_lft > valid_lft)
1926 return -EINVAL;
1927
1928 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1929 return -ENODEV;
1930
1931 if ((idev = addrconf_add_dev(dev)) == NULL)
1932 return -ENOBUFS;
1933
1934 scope = ipv6_addr_scope(pfx);
1935
1936 if (valid_lft == INFINITY_LIFE_TIME) {
1937 ifa_flags |= IFA_F_PERMANENT;
1938 flags = 0;
1939 } else if (valid_lft >= 0x7FFFFFFF/HZ)
1940 valid_lft = 0x7FFFFFFF/HZ;
1941
1942 if (prefered_lft == 0)
1943 ifa_flags |= IFA_F_DEPRECATED;
1944 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1945 (prefered_lft != INFINITY_LIFE_TIME))
1946 prefered_lft = 0x7FFFFFFF/HZ;
1947
1948 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1949
1950 if (!IS_ERR(ifp)) {
1951 spin_lock_bh(&ifp->lock);
1952 ifp->valid_lft = valid_lft;
1953 ifp->prefered_lft = prefered_lft;
1954 ifp->tstamp = jiffies;
1955 spin_unlock_bh(&ifp->lock);
1956
1957 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1958 jiffies_to_clock_t(valid_lft * HZ), flags);
1959 /*
1960 * Note that section 3.1 of RFC 4429 indicates
1961 * that the Optimistic flag should not be set for
1962 * manually configured addresses
1963 */
1964 addrconf_dad_start(ifp, 0);
1965 in6_ifa_put(ifp);
1966 addrconf_verify(0);
1967 return 0;
1968 }
1969
1970 return PTR_ERR(ifp);
1971 }
1972
1973 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1974 {
1975 struct inet6_ifaddr *ifp;
1976 struct inet6_dev *idev;
1977 struct net_device *dev;
1978
1979 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1980 return -ENODEV;
1981
1982 if ((idev = __in6_dev_get(dev)) == NULL)
1983 return -ENXIO;
1984
1985 read_lock_bh(&idev->lock);
1986 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1987 if (ifp->prefix_len == plen &&
1988 ipv6_addr_equal(pfx, &ifp->addr)) {
1989 in6_ifa_hold(ifp);
1990 read_unlock_bh(&idev->lock);
1991
1992 ipv6_del_addr(ifp);
1993
1994 /* If the last address is deleted administratively,
1995 disable IPv6 on this interface.
1996 */
1997 if (idev->addr_list == NULL)
1998 addrconf_ifdown(idev->dev, 1);
1999 return 0;
2000 }
2001 }
2002 read_unlock_bh(&idev->lock);
2003 return -EADDRNOTAVAIL;
2004 }
2005
2006
2007 int addrconf_add_ifaddr(void __user *arg)
2008 {
2009 struct in6_ifreq ireq;
2010 int err;
2011
2012 if (!capable(CAP_NET_ADMIN))
2013 return -EPERM;
2014
2015 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2016 return -EFAULT;
2017
2018 rtnl_lock();
2019 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2020 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2021 rtnl_unlock();
2022 return err;
2023 }
2024
2025 int addrconf_del_ifaddr(void __user *arg)
2026 {
2027 struct in6_ifreq ireq;
2028 int err;
2029
2030 if (!capable(CAP_NET_ADMIN))
2031 return -EPERM;
2032
2033 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2034 return -EFAULT;
2035
2036 rtnl_lock();
2037 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2038 rtnl_unlock();
2039 return err;
2040 }
2041
2042 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2043 static void sit_add_v4_addrs(struct inet6_dev *idev)
2044 {
2045 struct inet6_ifaddr * ifp;
2046 struct in6_addr addr;
2047 struct net_device *dev;
2048 int scope;
2049
2050 ASSERT_RTNL();
2051
2052 memset(&addr, 0, sizeof(struct in6_addr));
2053 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2054
2055 if (idev->dev->flags&IFF_POINTOPOINT) {
2056 addr.s6_addr32[0] = htonl(0xfe800000);
2057 scope = IFA_LINK;
2058 } else {
2059 scope = IPV6_ADDR_COMPATv4;
2060 }
2061
2062 if (addr.s6_addr32[3]) {
2063 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2064 if (!IS_ERR(ifp)) {
2065 spin_lock_bh(&ifp->lock);
2066 ifp->flags &= ~IFA_F_TENTATIVE;
2067 spin_unlock_bh(&ifp->lock);
2068 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2069 in6_ifa_put(ifp);
2070 }
2071 return;
2072 }
2073
2074 for_each_netdev(&init_net, dev) {
2075 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2076 if (in_dev && (dev->flags & IFF_UP)) {
2077 struct in_ifaddr * ifa;
2078
2079 int flag = scope;
2080
2081 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2082 int plen;
2083
2084 addr.s6_addr32[3] = ifa->ifa_local;
2085
2086 if (ifa->ifa_scope == RT_SCOPE_LINK)
2087 continue;
2088 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2089 if (idev->dev->flags&IFF_POINTOPOINT)
2090 continue;
2091 flag |= IFA_HOST;
2092 }
2093 if (idev->dev->flags&IFF_POINTOPOINT)
2094 plen = 64;
2095 else
2096 plen = 96;
2097
2098 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2099 IFA_F_PERMANENT);
2100 if (!IS_ERR(ifp)) {
2101 spin_lock_bh(&ifp->lock);
2102 ifp->flags &= ~IFA_F_TENTATIVE;
2103 spin_unlock_bh(&ifp->lock);
2104 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2105 in6_ifa_put(ifp);
2106 }
2107 }
2108 }
2109 }
2110 }
2111 #endif
2112
2113 static void init_loopback(struct net_device *dev)
2114 {
2115 struct inet6_dev *idev;
2116 struct inet6_ifaddr * ifp;
2117
2118 /* ::1 */
2119
2120 ASSERT_RTNL();
2121
2122 if ((idev = ipv6_find_idev(dev)) == NULL) {
2123 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2124 return;
2125 }
2126
2127 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2128 if (!IS_ERR(ifp)) {
2129 spin_lock_bh(&ifp->lock);
2130 ifp->flags &= ~IFA_F_TENTATIVE;
2131 spin_unlock_bh(&ifp->lock);
2132 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2133 in6_ifa_put(ifp);
2134 }
2135 }
2136
2137 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2138 {
2139 struct inet6_ifaddr * ifp;
2140 u32 addr_flags = IFA_F_PERMANENT;
2141
2142 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2143 if (idev->cnf.optimistic_dad &&
2144 !ipv6_devconf.forwarding)
2145 addr_flags |= IFA_F_OPTIMISTIC;
2146 #endif
2147
2148
2149 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2150 if (!IS_ERR(ifp)) {
2151 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2152 addrconf_dad_start(ifp, 0);
2153 in6_ifa_put(ifp);
2154 }
2155 }
2156
2157 static void addrconf_dev_config(struct net_device *dev)
2158 {
2159 struct in6_addr addr;
2160 struct inet6_dev * idev;
2161
2162 ASSERT_RTNL();
2163
2164 if ((dev->type != ARPHRD_ETHER) &&
2165 (dev->type != ARPHRD_FDDI) &&
2166 (dev->type != ARPHRD_IEEE802_TR) &&
2167 (dev->type != ARPHRD_ARCNET) &&
2168 (dev->type != ARPHRD_INFINIBAND)) {
2169 /* Alas, we support only Ethernet autoconfiguration. */
2170 return;
2171 }
2172
2173 idev = addrconf_add_dev(dev);
2174 if (idev == NULL)
2175 return;
2176
2177 memset(&addr, 0, sizeof(struct in6_addr));
2178 addr.s6_addr32[0] = htonl(0xFE800000);
2179
2180 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2181 addrconf_add_linklocal(idev, &addr);
2182 }
2183
2184 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2185 static void addrconf_sit_config(struct net_device *dev)
2186 {
2187 struct inet6_dev *idev;
2188
2189 ASSERT_RTNL();
2190
2191 /*
2192 * Configure the tunnel with one of our IPv4
2193 * addresses... we should configure all of
2194 * our v4 addrs in the tunnel
2195 */
2196
2197 if ((idev = ipv6_find_idev(dev)) == NULL) {
2198 printk(KERN_DEBUG "init sit: add_dev failed\n");
2199 return;
2200 }
2201
2202 sit_add_v4_addrs(idev);
2203
2204 if (dev->flags&IFF_POINTOPOINT) {
2205 addrconf_add_mroute(dev);
2206 addrconf_add_lroute(dev);
2207 } else
2208 sit_route_add(dev);
2209 }
2210 #endif
2211
2212 static inline int
2213 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2214 {
2215 struct in6_addr lladdr;
2216
2217 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2218 addrconf_add_linklocal(idev, &lladdr);
2219 return 0;
2220 }
2221 return -1;
2222 }
2223
2224 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2225 {
2226 struct net_device *link_dev;
2227
2228 /* first try to inherit the link-local address from the link device */
2229 if (idev->dev->iflink &&
2230 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2231 if (!ipv6_inherit_linklocal(idev, link_dev))
2232 return;
2233 }
2234 /* then try to inherit it from any device */
2235 for_each_netdev(&init_net, link_dev) {
2236 if (!ipv6_inherit_linklocal(idev, link_dev))
2237 return;
2238 }
2239 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2240 }
2241
2242 /*
2243 * Autoconfigure tunnel with a link-local address so routing protocols,
2244 * DHCPv6, MLD etc. can be run over the virtual link
2245 */
2246
2247 static void addrconf_ip6_tnl_config(struct net_device *dev)
2248 {
2249 struct inet6_dev *idev;
2250
2251 ASSERT_RTNL();
2252
2253 if ((idev = addrconf_add_dev(dev)) == NULL) {
2254 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2255 return;
2256 }
2257 ip6_tnl_add_linklocal(idev);
2258 }
2259
2260 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2261 void * data)
2262 {
2263 struct net_device *dev = (struct net_device *) data;
2264 struct inet6_dev *idev = __in6_dev_get(dev);
2265 int run_pending = 0;
2266 int err;
2267
2268 if (dev->nd_net != &init_net)
2269 return NOTIFY_DONE;
2270
2271 switch(event) {
2272 case NETDEV_REGISTER:
2273 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2274 idev = ipv6_add_dev(dev);
2275 if (!idev)
2276 return notifier_from_errno(-ENOMEM);
2277 }
2278 break;
2279 case NETDEV_UP:
2280 case NETDEV_CHANGE:
2281 if (dev->flags & IFF_SLAVE)
2282 break;
2283
2284 if (event == NETDEV_UP) {
2285 if (!addrconf_qdisc_ok(dev)) {
2286 /* device is not ready yet. */
2287 printk(KERN_INFO
2288 "ADDRCONF(NETDEV_UP): %s: "
2289 "link is not ready\n",
2290 dev->name);
2291 break;
2292 }
2293
2294 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2295 idev = ipv6_add_dev(dev);
2296
2297 if (idev)
2298 idev->if_flags |= IF_READY;
2299 } else {
2300 if (!addrconf_qdisc_ok(dev)) {
2301 /* device is still not ready. */
2302 break;
2303 }
2304
2305 if (idev) {
2306 if (idev->if_flags & IF_READY) {
2307 /* device is already configured. */
2308 break;
2309 }
2310 idev->if_flags |= IF_READY;
2311 }
2312
2313 printk(KERN_INFO
2314 "ADDRCONF(NETDEV_CHANGE): %s: "
2315 "link becomes ready\n",
2316 dev->name);
2317
2318 run_pending = 1;
2319 }
2320
2321 switch(dev->type) {
2322 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2323 case ARPHRD_SIT:
2324 addrconf_sit_config(dev);
2325 break;
2326 #endif
2327 case ARPHRD_TUNNEL6:
2328 addrconf_ip6_tnl_config(dev);
2329 break;
2330 case ARPHRD_LOOPBACK:
2331 init_loopback(dev);
2332 break;
2333
2334 default:
2335 addrconf_dev_config(dev);
2336 break;
2337 }
2338 if (idev) {
2339 if (run_pending)
2340 addrconf_dad_run(idev);
2341
2342 /* If the MTU changed during the interface down, when the
2343 interface up, the changed MTU must be reflected in the
2344 idev as well as routers.
2345 */
2346 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2347 rt6_mtu_change(dev, dev->mtu);
2348 idev->cnf.mtu6 = dev->mtu;
2349 }
2350 idev->tstamp = jiffies;
2351 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2352 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2353 stop IPv6 on this interface.
2354 */
2355 if (dev->mtu < IPV6_MIN_MTU)
2356 addrconf_ifdown(dev, event != NETDEV_DOWN);
2357 }
2358 break;
2359
2360 case NETDEV_CHANGEMTU:
2361 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2362 rt6_mtu_change(dev, dev->mtu);
2363 idev->cnf.mtu6 = dev->mtu;
2364 break;
2365 }
2366
2367 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2368 idev = ipv6_add_dev(dev);
2369 if (idev)
2370 break;
2371 }
2372
2373 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2374
2375 case NETDEV_DOWN:
2376 case NETDEV_UNREGISTER:
2377 /*
2378 * Remove all addresses from this interface.
2379 */
2380 addrconf_ifdown(dev, event != NETDEV_DOWN);
2381 break;
2382
2383 case NETDEV_CHANGENAME:
2384 if (idev) {
2385 snmp6_unregister_dev(idev);
2386 #ifdef CONFIG_SYSCTL
2387 addrconf_sysctl_unregister(&idev->cnf);
2388 neigh_sysctl_unregister(idev->nd_parms);
2389 neigh_sysctl_register(dev, idev->nd_parms,
2390 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2391 &ndisc_ifinfo_sysctl_change,
2392 NULL);
2393 addrconf_sysctl_register(idev, &idev->cnf);
2394 #endif
2395 err = snmp6_register_dev(idev);
2396 if (err)
2397 return notifier_from_errno(err);
2398 }
2399 break;
2400 }
2401
2402 return NOTIFY_OK;
2403 }
2404
2405 /*
2406 * addrconf module should be notified of a device going up
2407 */
2408 static struct notifier_block ipv6_dev_notf = {
2409 .notifier_call = addrconf_notify,
2410 .priority = 0
2411 };
2412
2413 static int addrconf_ifdown(struct net_device *dev, int how)
2414 {
2415 struct inet6_dev *idev;
2416 struct inet6_ifaddr *ifa, **bifa;
2417 int i;
2418
2419 ASSERT_RTNL();
2420
2421 if (dev == init_net.loopback_dev && how == 1)
2422 how = 0;
2423
2424 rt6_ifdown(dev);
2425 neigh_ifdown(&nd_tbl, dev);
2426
2427 idev = __in6_dev_get(dev);
2428 if (idev == NULL)
2429 return -ENODEV;
2430
2431 /* Step 1: remove reference to ipv6 device from parent device.
2432 Do not dev_put!
2433 */
2434 if (how == 1) {
2435 idev->dead = 1;
2436
2437 /* protected by rtnl_lock */
2438 rcu_assign_pointer(dev->ip6_ptr, NULL);
2439
2440 /* Step 1.5: remove snmp6 entry */
2441 snmp6_unregister_dev(idev);
2442
2443 }
2444
2445 /* Step 2: clear hash table */
2446 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2447 bifa = &inet6_addr_lst[i];
2448
2449 write_lock_bh(&addrconf_hash_lock);
2450 while ((ifa = *bifa) != NULL) {
2451 if (ifa->idev == idev) {
2452 *bifa = ifa->lst_next;
2453 ifa->lst_next = NULL;
2454 addrconf_del_timer(ifa);
2455 in6_ifa_put(ifa);
2456 continue;
2457 }
2458 bifa = &ifa->lst_next;
2459 }
2460 write_unlock_bh(&addrconf_hash_lock);
2461 }
2462
2463 write_lock_bh(&idev->lock);
2464
2465 /* Step 3: clear flags for stateless addrconf */
2466 if (how != 1)
2467 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2468
2469 /* Step 4: clear address list */
2470 #ifdef CONFIG_IPV6_PRIVACY
2471 if (how == 1 && del_timer(&idev->regen_timer))
2472 in6_dev_put(idev);
2473
2474 /* clear tempaddr list */
2475 while ((ifa = idev->tempaddr_list) != NULL) {
2476 idev->tempaddr_list = ifa->tmp_next;
2477 ifa->tmp_next = NULL;
2478 ifa->dead = 1;
2479 write_unlock_bh(&idev->lock);
2480 spin_lock_bh(&ifa->lock);
2481
2482 if (ifa->ifpub) {
2483 in6_ifa_put(ifa->ifpub);
2484 ifa->ifpub = NULL;
2485 }
2486 spin_unlock_bh(&ifa->lock);
2487 in6_ifa_put(ifa);
2488 write_lock_bh(&idev->lock);
2489 }
2490 #endif
2491 while ((ifa = idev->addr_list) != NULL) {
2492 idev->addr_list = ifa->if_next;
2493 ifa->if_next = NULL;
2494 ifa->dead = 1;
2495 addrconf_del_timer(ifa);
2496 write_unlock_bh(&idev->lock);
2497
2498 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2499 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2500 in6_ifa_put(ifa);
2501
2502 write_lock_bh(&idev->lock);
2503 }
2504 write_unlock_bh(&idev->lock);
2505
2506 /* Step 5: Discard multicast list */
2507
2508 if (how == 1)
2509 ipv6_mc_destroy_dev(idev);
2510 else
2511 ipv6_mc_down(idev);
2512
2513 idev->tstamp = jiffies;
2514
2515 /* Shot the device (if unregistered) */
2516
2517 if (how == 1) {
2518 #ifdef CONFIG_SYSCTL
2519 addrconf_sysctl_unregister(&idev->cnf);
2520 neigh_sysctl_unregister(idev->nd_parms);
2521 #endif
2522 neigh_parms_release(&nd_tbl, idev->nd_parms);
2523 neigh_ifdown(&nd_tbl, dev);
2524 in6_dev_put(idev);
2525 }
2526 return 0;
2527 }
2528
2529 static void addrconf_rs_timer(unsigned long data)
2530 {
2531 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2532
2533 if (ifp->idev->cnf.forwarding)
2534 goto out;
2535
2536 if (ifp->idev->if_flags & IF_RA_RCVD) {
2537 /*
2538 * Announcement received after solicitation
2539 * was sent
2540 */
2541 goto out;
2542 }
2543
2544 spin_lock(&ifp->lock);
2545 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2546 struct in6_addr all_routers;
2547
2548 /* The wait after the last probe can be shorter */
2549 addrconf_mod_timer(ifp, AC_RS,
2550 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2551 ifp->idev->cnf.rtr_solicit_delay :
2552 ifp->idev->cnf.rtr_solicit_interval);
2553 spin_unlock(&ifp->lock);
2554
2555 ipv6_addr_all_routers(&all_routers);
2556
2557 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2558 } else {
2559 spin_unlock(&ifp->lock);
2560 /*
2561 * Note: we do not support deprecated "all on-link"
2562 * assumption any longer.
2563 */
2564 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2565 ifp->idev->dev->name);
2566 }
2567
2568 out:
2569 in6_ifa_put(ifp);
2570 }
2571
2572 /*
2573 * Duplicate Address Detection
2574 */
2575 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2576 {
2577 unsigned long rand_num;
2578 struct inet6_dev *idev = ifp->idev;
2579
2580 if (ifp->flags & IFA_F_OPTIMISTIC)
2581 rand_num = 0;
2582 else
2583 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2584
2585 ifp->probes = idev->cnf.dad_transmits;
2586 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2587 }
2588
2589 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2590 {
2591 struct inet6_dev *idev = ifp->idev;
2592 struct net_device *dev = idev->dev;
2593
2594 addrconf_join_solict(dev, &ifp->addr);
2595
2596 net_srandom(ifp->addr.s6_addr32[3]);
2597
2598 read_lock_bh(&idev->lock);
2599 if (ifp->dead)
2600 goto out;
2601 spin_lock_bh(&ifp->lock);
2602
2603 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2604 !(ifp->flags&IFA_F_TENTATIVE) ||
2605 ifp->flags & IFA_F_NODAD) {
2606 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2607 spin_unlock_bh(&ifp->lock);
2608 read_unlock_bh(&idev->lock);
2609
2610 addrconf_dad_completed(ifp);
2611 return;
2612 }
2613
2614 if (!(idev->if_flags & IF_READY)) {
2615 spin_unlock_bh(&ifp->lock);
2616 read_unlock_bh(&idev->lock);
2617 /*
2618 * If the defice is not ready:
2619 * - keep it tentative if it is a permanent address.
2620 * - otherwise, kill it.
2621 */
2622 in6_ifa_hold(ifp);
2623 addrconf_dad_stop(ifp);
2624 return;
2625 }
2626
2627 /*
2628 * Optimistic nodes can start receiving
2629 * Frames right away
2630 */
2631 if(ifp->flags & IFA_F_OPTIMISTIC)
2632 ip6_ins_rt(ifp->rt);
2633
2634 addrconf_dad_kick(ifp);
2635 spin_unlock_bh(&ifp->lock);
2636 out:
2637 read_unlock_bh(&idev->lock);
2638 }
2639
2640 static void addrconf_dad_timer(unsigned long data)
2641 {
2642 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2643 struct inet6_dev *idev = ifp->idev;
2644 struct in6_addr unspec;
2645 struct in6_addr mcaddr;
2646
2647 read_lock_bh(&idev->lock);
2648 if (idev->dead) {
2649 read_unlock_bh(&idev->lock);
2650 goto out;
2651 }
2652 spin_lock_bh(&ifp->lock);
2653 if (ifp->probes == 0) {
2654 /*
2655 * DAD was successful
2656 */
2657
2658 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2659 spin_unlock_bh(&ifp->lock);
2660 read_unlock_bh(&idev->lock);
2661
2662 addrconf_dad_completed(ifp);
2663
2664 goto out;
2665 }
2666
2667 ifp->probes--;
2668 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2669 spin_unlock_bh(&ifp->lock);
2670 read_unlock_bh(&idev->lock);
2671
2672 /* send a neighbour solicitation for our addr */
2673 memset(&unspec, 0, sizeof(unspec));
2674 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2675 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2676 out:
2677 in6_ifa_put(ifp);
2678 }
2679
2680 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2681 {
2682 struct net_device * dev = ifp->idev->dev;
2683
2684 /*
2685 * Configure the address for reception. Now it is valid.
2686 */
2687
2688 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2689
2690 /* If added prefix is link local and forwarding is off,
2691 start sending router solicitations.
2692 */
2693
2694 if (ifp->idev->cnf.forwarding == 0 &&
2695 ifp->idev->cnf.rtr_solicits > 0 &&
2696 (dev->flags&IFF_LOOPBACK) == 0 &&
2697 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2698 struct in6_addr all_routers;
2699
2700 ipv6_addr_all_routers(&all_routers);
2701
2702 /*
2703 * If a host as already performed a random delay
2704 * [...] as part of DAD [...] there is no need
2705 * to delay again before sending the first RS
2706 */
2707 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2708
2709 spin_lock_bh(&ifp->lock);
2710 ifp->probes = 1;
2711 ifp->idev->if_flags |= IF_RS_SENT;
2712 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2713 spin_unlock_bh(&ifp->lock);
2714 }
2715 }
2716
2717 static void addrconf_dad_run(struct inet6_dev *idev) {
2718 struct inet6_ifaddr *ifp;
2719
2720 read_lock_bh(&idev->lock);
2721 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2722 spin_lock_bh(&ifp->lock);
2723 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2724 spin_unlock_bh(&ifp->lock);
2725 continue;
2726 }
2727 spin_unlock_bh(&ifp->lock);
2728 addrconf_dad_kick(ifp);
2729 }
2730 read_unlock_bh(&idev->lock);
2731 }
2732
2733 #ifdef CONFIG_PROC_FS
2734 struct if6_iter_state {
2735 int bucket;
2736 };
2737
2738 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2739 {
2740 struct inet6_ifaddr *ifa = NULL;
2741 struct if6_iter_state *state = seq->private;
2742
2743 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2744 ifa = inet6_addr_lst[state->bucket];
2745 if (ifa)
2746 break;
2747 }
2748 return ifa;
2749 }
2750
2751 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2752 {
2753 struct if6_iter_state *state = seq->private;
2754
2755 ifa = ifa->lst_next;
2756 try_again:
2757 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2758 ifa = inet6_addr_lst[state->bucket];
2759 goto try_again;
2760 }
2761 return ifa;
2762 }
2763
2764 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2765 {
2766 struct inet6_ifaddr *ifa = if6_get_first(seq);
2767
2768 if (ifa)
2769 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2770 --pos;
2771 return pos ? NULL : ifa;
2772 }
2773
2774 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2775 {
2776 read_lock_bh(&addrconf_hash_lock);
2777 return if6_get_idx(seq, *pos);
2778 }
2779
2780 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2781 {
2782 struct inet6_ifaddr *ifa;
2783
2784 ifa = if6_get_next(seq, v);
2785 ++*pos;
2786 return ifa;
2787 }
2788
2789 static void if6_seq_stop(struct seq_file *seq, void *v)
2790 {
2791 read_unlock_bh(&addrconf_hash_lock);
2792 }
2793
2794 static int if6_seq_show(struct seq_file *seq, void *v)
2795 {
2796 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2797 seq_printf(seq,
2798 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2799 NIP6(ifp->addr),
2800 ifp->idev->dev->ifindex,
2801 ifp->prefix_len,
2802 ifp->scope,
2803 ifp->flags,
2804 ifp->idev->dev->name);
2805 return 0;
2806 }
2807
2808 static const struct seq_operations if6_seq_ops = {
2809 .start = if6_seq_start,
2810 .next = if6_seq_next,
2811 .show = if6_seq_show,
2812 .stop = if6_seq_stop,
2813 };
2814
2815 static int if6_seq_open(struct inode *inode, struct file *file)
2816 {
2817 return seq_open_private(file, &if6_seq_ops,
2818 sizeof(struct if6_iter_state));
2819 }
2820
2821 static const struct file_operations if6_fops = {
2822 .owner = THIS_MODULE,
2823 .open = if6_seq_open,
2824 .read = seq_read,
2825 .llseek = seq_lseek,
2826 .release = seq_release_private,
2827 };
2828
2829 int __init if6_proc_init(void)
2830 {
2831 if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
2832 return -ENOMEM;
2833 return 0;
2834 }
2835
2836 void if6_proc_exit(void)
2837 {
2838 proc_net_remove(&init_net, "if_inet6");
2839 }
2840 #endif /* CONFIG_PROC_FS */
2841
2842 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2843 /* Check if address is a home address configured on any interface. */
2844 int ipv6_chk_home_addr(struct in6_addr *addr)
2845 {
2846 int ret = 0;
2847 struct inet6_ifaddr * ifp;
2848 u8 hash = ipv6_addr_hash(addr);
2849 read_lock_bh(&addrconf_hash_lock);
2850 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2851 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2852 (ifp->flags & IFA_F_HOMEADDRESS)) {
2853 ret = 1;
2854 break;
2855 }
2856 }
2857 read_unlock_bh(&addrconf_hash_lock);
2858 return ret;
2859 }
2860 #endif
2861
2862 /*
2863 * Periodic address status verification
2864 */
2865
2866 static void addrconf_verify(unsigned long foo)
2867 {
2868 struct inet6_ifaddr *ifp;
2869 unsigned long now, next;
2870 int i;
2871
2872 spin_lock_bh(&addrconf_verify_lock);
2873 now = jiffies;
2874 next = now + ADDR_CHECK_FREQUENCY;
2875
2876 del_timer(&addr_chk_timer);
2877
2878 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2879
2880 restart:
2881 read_lock(&addrconf_hash_lock);
2882 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2883 unsigned long age;
2884 #ifdef CONFIG_IPV6_PRIVACY
2885 unsigned long regen_advance;
2886 #endif
2887
2888 if (ifp->flags & IFA_F_PERMANENT)
2889 continue;
2890
2891 spin_lock(&ifp->lock);
2892 age = (now - ifp->tstamp) / HZ;
2893
2894 #ifdef CONFIG_IPV6_PRIVACY
2895 regen_advance = ifp->idev->cnf.regen_max_retry *
2896 ifp->idev->cnf.dad_transmits *
2897 ifp->idev->nd_parms->retrans_time / HZ;
2898 #endif
2899
2900 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2901 age >= ifp->valid_lft) {
2902 spin_unlock(&ifp->lock);
2903 in6_ifa_hold(ifp);
2904 read_unlock(&addrconf_hash_lock);
2905 ipv6_del_addr(ifp);
2906 goto restart;
2907 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2908 spin_unlock(&ifp->lock);
2909 continue;
2910 } else if (age >= ifp->prefered_lft) {
2911 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2912 int deprecate = 0;
2913
2914 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2915 deprecate = 1;
2916 ifp->flags |= IFA_F_DEPRECATED;
2917 }
2918
2919 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2920 next = ifp->tstamp + ifp->valid_lft * HZ;
2921
2922 spin_unlock(&ifp->lock);
2923
2924 if (deprecate) {
2925 in6_ifa_hold(ifp);
2926 read_unlock(&addrconf_hash_lock);
2927
2928 ipv6_ifa_notify(0, ifp);
2929 in6_ifa_put(ifp);
2930 goto restart;
2931 }
2932 #ifdef CONFIG_IPV6_PRIVACY
2933 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2934 !(ifp->flags&IFA_F_TENTATIVE)) {
2935 if (age >= ifp->prefered_lft - regen_advance) {
2936 struct inet6_ifaddr *ifpub = ifp->ifpub;
2937 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2938 next = ifp->tstamp + ifp->prefered_lft * HZ;
2939 if (!ifp->regen_count && ifpub) {
2940 ifp->regen_count++;
2941 in6_ifa_hold(ifp);
2942 in6_ifa_hold(ifpub);
2943 spin_unlock(&ifp->lock);
2944 read_unlock(&addrconf_hash_lock);
2945 spin_lock(&ifpub->lock);
2946 ifpub->regen_count = 0;
2947 spin_unlock(&ifpub->lock);
2948 ipv6_create_tempaddr(ifpub, ifp);
2949 in6_ifa_put(ifpub);
2950 in6_ifa_put(ifp);
2951 goto restart;
2952 }
2953 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2954 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2955 spin_unlock(&ifp->lock);
2956 #endif
2957 } else {
2958 /* ifp->prefered_lft <= ifp->valid_lft */
2959 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2960 next = ifp->tstamp + ifp->prefered_lft * HZ;
2961 spin_unlock(&ifp->lock);
2962 }
2963 }
2964 read_unlock(&addrconf_hash_lock);
2965 }
2966
2967 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2968 add_timer(&addr_chk_timer);
2969 spin_unlock_bh(&addrconf_verify_lock);
2970 }
2971
2972 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2973 {
2974 struct in6_addr *pfx = NULL;
2975
2976 if (addr)
2977 pfx = nla_data(addr);
2978
2979 if (local) {
2980 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2981 pfx = NULL;
2982 else
2983 pfx = nla_data(local);
2984 }
2985
2986 return pfx;
2987 }
2988
2989 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
2990 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2991 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2992 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2993 };
2994
2995 static int
2996 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2997 {
2998 struct ifaddrmsg *ifm;
2999 struct nlattr *tb[IFA_MAX+1];
3000 struct in6_addr *pfx;
3001 int err;
3002
3003 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3004 if (err < 0)
3005 return err;
3006
3007 ifm = nlmsg_data(nlh);
3008 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3009 if (pfx == NULL)
3010 return -EINVAL;
3011
3012 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3013 }
3014
3015 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3016 u32 prefered_lft, u32 valid_lft)
3017 {
3018 u32 flags = RTF_EXPIRES;
3019
3020 if (!valid_lft || (prefered_lft > valid_lft))
3021 return -EINVAL;
3022
3023 if (valid_lft == INFINITY_LIFE_TIME) {
3024 ifa_flags |= IFA_F_PERMANENT;
3025 flags = 0;
3026 } else if (valid_lft >= 0x7FFFFFFF/HZ)
3027 valid_lft = 0x7FFFFFFF/HZ;
3028
3029 if (prefered_lft == 0)
3030 ifa_flags |= IFA_F_DEPRECATED;
3031 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3032 (prefered_lft != INFINITY_LIFE_TIME))
3033 prefered_lft = 0x7FFFFFFF/HZ;
3034
3035 spin_lock_bh(&ifp->lock);
3036 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3037 ifp->tstamp = jiffies;
3038 ifp->valid_lft = valid_lft;
3039 ifp->prefered_lft = prefered_lft;
3040
3041 spin_unlock_bh(&ifp->lock);
3042 if (!(ifp->flags&IFA_F_TENTATIVE))
3043 ipv6_ifa_notify(0, ifp);
3044
3045 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3046 jiffies_to_clock_t(valid_lft * HZ), flags);
3047 addrconf_verify(0);
3048
3049 return 0;
3050 }
3051
3052 static int
3053 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3054 {
3055 struct ifaddrmsg *ifm;
3056 struct nlattr *tb[IFA_MAX+1];
3057 struct in6_addr *pfx;
3058 struct inet6_ifaddr *ifa;
3059 struct net_device *dev;
3060 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3061 u8 ifa_flags;
3062 int err;
3063
3064 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3065 if (err < 0)
3066 return err;
3067
3068 ifm = nlmsg_data(nlh);
3069 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3070 if (pfx == NULL)
3071 return -EINVAL;
3072
3073 if (tb[IFA_CACHEINFO]) {
3074 struct ifa_cacheinfo *ci;
3075
3076 ci = nla_data(tb[IFA_CACHEINFO]);
3077 valid_lft = ci->ifa_valid;
3078 preferred_lft = ci->ifa_prefered;
3079 } else {
3080 preferred_lft = INFINITY_LIFE_TIME;
3081 valid_lft = INFINITY_LIFE_TIME;
3082 }
3083
3084 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3085 if (dev == NULL)
3086 return -ENODEV;
3087
3088 /* We ignore other flags so far. */
3089 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3090
3091 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3092 if (ifa == NULL) {
3093 /*
3094 * It would be best to check for !NLM_F_CREATE here but
3095 * userspace alreay relies on not having to provide this.
3096 */
3097 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3098 ifa_flags, preferred_lft, valid_lft);
3099 }
3100
3101 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3102 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3103 err = -EEXIST;
3104 else
3105 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3106
3107 in6_ifa_put(ifa);
3108
3109 return err;
3110 }
3111
3112 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3113 u8 scope, int ifindex)
3114 {
3115 struct ifaddrmsg *ifm;
3116
3117 ifm = nlmsg_data(nlh);
3118 ifm->ifa_family = AF_INET6;
3119 ifm->ifa_prefixlen = prefixlen;
3120 ifm->ifa_flags = flags;
3121 ifm->ifa_scope = scope;
3122 ifm->ifa_index = ifindex;
3123 }
3124
3125 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3126 unsigned long tstamp, u32 preferred, u32 valid)
3127 {
3128 struct ifa_cacheinfo ci;
3129
3130 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3131 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3132 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3133 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3134 ci.ifa_prefered = preferred;
3135 ci.ifa_valid = valid;
3136
3137 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3138 }
3139
3140 static inline int rt_scope(int ifa_scope)
3141 {
3142 if (ifa_scope & IFA_HOST)
3143 return RT_SCOPE_HOST;
3144 else if (ifa_scope & IFA_LINK)
3145 return RT_SCOPE_LINK;
3146 else if (ifa_scope & IFA_SITE)
3147 return RT_SCOPE_SITE;
3148 else
3149 return RT_SCOPE_UNIVERSE;
3150 }
3151
3152 static inline int inet6_ifaddr_msgsize(void)
3153 {
3154 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3155 + nla_total_size(16) /* IFA_ADDRESS */
3156 + nla_total_size(sizeof(struct ifa_cacheinfo));
3157 }
3158
3159 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3160 u32 pid, u32 seq, int event, unsigned int flags)
3161 {
3162 struct nlmsghdr *nlh;
3163 u32 preferred, valid;
3164
3165 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3166 if (nlh == NULL)
3167 return -EMSGSIZE;
3168
3169 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3170 ifa->idev->dev->ifindex);
3171
3172 if (!(ifa->flags&IFA_F_PERMANENT)) {
3173 preferred = ifa->prefered_lft;
3174 valid = ifa->valid_lft;
3175 if (preferred != INFINITY_LIFE_TIME) {
3176 long tval = (jiffies - ifa->tstamp)/HZ;
3177 preferred -= tval;
3178 if (valid != INFINITY_LIFE_TIME)
3179 valid -= tval;
3180 }
3181 } else {
3182 preferred = INFINITY_LIFE_TIME;
3183 valid = INFINITY_LIFE_TIME;
3184 }
3185
3186 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3187 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3188 nlmsg_cancel(skb, nlh);
3189 return -EMSGSIZE;
3190 }
3191
3192 return nlmsg_end(skb, nlh);
3193 }
3194
3195 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3196 u32 pid, u32 seq, int event, u16 flags)
3197 {
3198 struct nlmsghdr *nlh;
3199 u8 scope = RT_SCOPE_UNIVERSE;
3200 int ifindex = ifmca->idev->dev->ifindex;
3201
3202 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3203 scope = RT_SCOPE_SITE;
3204
3205 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3206 if (nlh == NULL)
3207 return -EMSGSIZE;
3208
3209 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3210 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3211 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3212 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3213 nlmsg_cancel(skb, nlh);
3214 return -EMSGSIZE;
3215 }
3216
3217 return nlmsg_end(skb, nlh);
3218 }
3219
3220 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3221 u32 pid, u32 seq, int event, unsigned int flags)
3222 {
3223 struct nlmsghdr *nlh;
3224 u8 scope = RT_SCOPE_UNIVERSE;
3225 int ifindex = ifaca->aca_idev->dev->ifindex;
3226
3227 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3228 scope = RT_SCOPE_SITE;
3229
3230 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3231 if (nlh == NULL)
3232 return -EMSGSIZE;
3233
3234 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3235 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3236 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3237 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3238 nlmsg_cancel(skb, nlh);
3239 return -EMSGSIZE;
3240 }
3241
3242 return nlmsg_end(skb, nlh);
3243 }
3244
3245 enum addr_type_t
3246 {
3247 UNICAST_ADDR,
3248 MULTICAST_ADDR,
3249 ANYCAST_ADDR,
3250 };
3251
3252 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3253 enum addr_type_t type)
3254 {
3255 int idx, ip_idx;
3256 int s_idx, s_ip_idx;
3257 int err = 1;
3258 struct net_device *dev;
3259 struct inet6_dev *idev = NULL;
3260 struct inet6_ifaddr *ifa;
3261 struct ifmcaddr6 *ifmca;
3262 struct ifacaddr6 *ifaca;
3263
3264 s_idx = cb->args[0];
3265 s_ip_idx = ip_idx = cb->args[1];
3266
3267 idx = 0;
3268 for_each_netdev(&init_net, dev) {
3269 if (idx < s_idx)
3270 goto cont;
3271 if (idx > s_idx)
3272 s_ip_idx = 0;
3273 ip_idx = 0;
3274 if ((idev = in6_dev_get(dev)) == NULL)
3275 goto cont;
3276 read_lock_bh(&idev->lock);
3277 switch (type) {
3278 case UNICAST_ADDR:
3279 /* unicast address incl. temp addr */
3280 for (ifa = idev->addr_list; ifa;
3281 ifa = ifa->if_next, ip_idx++) {
3282 if (ip_idx < s_ip_idx)
3283 continue;
3284 if ((err = inet6_fill_ifaddr(skb, ifa,
3285 NETLINK_CB(cb->skb).pid,
3286 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3287 NLM_F_MULTI)) <= 0)
3288 goto done;
3289 }
3290 break;
3291 case MULTICAST_ADDR:
3292 /* multicast address */
3293 for (ifmca = idev->mc_list; ifmca;
3294 ifmca = ifmca->next, ip_idx++) {
3295 if (ip_idx < s_ip_idx)
3296 continue;
3297 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3298 NETLINK_CB(cb->skb).pid,
3299 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3300 NLM_F_MULTI)) <= 0)
3301 goto done;
3302 }
3303 break;
3304 case ANYCAST_ADDR:
3305 /* anycast address */
3306 for (ifaca = idev->ac_list; ifaca;
3307 ifaca = ifaca->aca_next, ip_idx++) {
3308 if (ip_idx < s_ip_idx)
3309 continue;
3310 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3311 NETLINK_CB(cb->skb).pid,
3312 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3313 NLM_F_MULTI)) <= 0)
3314 goto done;
3315 }
3316 break;
3317 default:
3318 break;
3319 }
3320 read_unlock_bh(&idev->lock);
3321 in6_dev_put(idev);
3322 cont:
3323 idx++;
3324 }
3325 done:
3326 if (err <= 0) {
3327 read_unlock_bh(&idev->lock);
3328 in6_dev_put(idev);
3329 }
3330 cb->args[0] = idx;
3331 cb->args[1] = ip_idx;
3332 return skb->len;
3333 }
3334
3335 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3336 {
3337 enum addr_type_t type = UNICAST_ADDR;
3338 return inet6_dump_addr(skb, cb, type);
3339 }
3340
3341 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3342 {
3343 enum addr_type_t type = MULTICAST_ADDR;
3344 return inet6_dump_addr(skb, cb, type);
3345 }
3346
3347
3348 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3349 {
3350 enum addr_type_t type = ANYCAST_ADDR;
3351 return inet6_dump_addr(skb, cb, type);
3352 }
3353
3354 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3355 void *arg)
3356 {
3357 struct ifaddrmsg *ifm;
3358 struct nlattr *tb[IFA_MAX+1];
3359 struct in6_addr *addr = NULL;
3360 struct net_device *dev = NULL;
3361 struct inet6_ifaddr *ifa;
3362 struct sk_buff *skb;
3363 int err;
3364
3365 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3366 if (err < 0)
3367 goto errout;
3368
3369 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3370 if (addr == NULL) {
3371 err = -EINVAL;
3372 goto errout;
3373 }
3374
3375 ifm = nlmsg_data(nlh);
3376 if (ifm->ifa_index)
3377 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3378
3379 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3380 err = -EADDRNOTAVAIL;
3381 goto errout;
3382 }
3383
3384 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3385 err = -ENOBUFS;
3386 goto errout_ifa;
3387 }
3388
3389 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3390 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3391 if (err < 0) {
3392 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3393 WARN_ON(err == -EMSGSIZE);
3394 kfree_skb(skb);
3395 goto errout_ifa;
3396 }
3397 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3398 errout_ifa:
3399 in6_ifa_put(ifa);
3400 errout:
3401 return err;
3402 }
3403
3404 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3405 {
3406 struct sk_buff *skb;
3407 int err = -ENOBUFS;
3408
3409 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3410 if (skb == NULL)
3411 goto errout;
3412
3413 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3414 if (err < 0) {
3415 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3416 WARN_ON(err == -EMSGSIZE);
3417 kfree_skb(skb);
3418 goto errout;
3419 }
3420 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3421 errout:
3422 if (err < 0)
3423 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3424 }
3425
3426 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3427 __s32 *array, int bytes)
3428 {
3429 BUG_ON(bytes < (DEVCONF_MAX * 4));
3430
3431 memset(array, 0, bytes);
3432 array[DEVCONF_FORWARDING] = cnf->forwarding;
3433 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3434 array[DEVCONF_MTU6] = cnf->mtu6;
3435 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3436 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3437 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3438 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3439 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3440 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3441 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3442 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3443 #ifdef CONFIG_IPV6_PRIVACY
3444 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3445 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3446 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3447 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3448 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3449 #endif
3450 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3451 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3452 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3453 #ifdef CONFIG_IPV6_ROUTER_PREF
3454 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3455 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3456 #ifdef CONFIG_IPV6_ROUTE_INFO
3457 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3458 #endif
3459 #endif
3460 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3461 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3462 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3463 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3464 #endif
3465 }
3466
3467 static inline size_t inet6_if_nlmsg_size(void)
3468 {
3469 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3470 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3471 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3472 + nla_total_size(4) /* IFLA_MTU */
3473 + nla_total_size(4) /* IFLA_LINK */
3474 + nla_total_size( /* IFLA_PROTINFO */
3475 nla_total_size(4) /* IFLA_INET6_FLAGS */
3476 + nla_total_size(sizeof(struct ifla_cacheinfo))
3477 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3478 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3479 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3480 );
3481 }
3482
3483 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3484 int bytes)
3485 {
3486 int i;
3487 int pad = bytes - sizeof(u64) * items;
3488 BUG_ON(pad < 0);
3489
3490 /* Use put_unaligned() because stats may not be aligned for u64. */
3491 put_unaligned(items, &stats[0]);
3492 for (i = 1; i < items; i++)
3493 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3494
3495 memset(&stats[items], 0, pad);
3496 }
3497
3498 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3499 int bytes)
3500 {
3501 switch(attrtype) {
3502 case IFLA_INET6_STATS:
3503 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3504 break;
3505 case IFLA_INET6_ICMP6STATS:
3506 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3507 break;
3508 }
3509 }
3510
3511 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3512 u32 pid, u32 seq, int event, unsigned int flags)
3513 {
3514 struct net_device *dev = idev->dev;
3515 struct nlattr *nla;
3516 struct ifinfomsg *hdr;
3517 struct nlmsghdr *nlh;
3518 void *protoinfo;
3519 struct ifla_cacheinfo ci;
3520
3521 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3522 if (nlh == NULL)
3523 return -EMSGSIZE;
3524
3525 hdr = nlmsg_data(nlh);
3526 hdr->ifi_family = AF_INET6;
3527 hdr->__ifi_pad = 0;
3528 hdr->ifi_type = dev->type;
3529 hdr->ifi_index = dev->ifindex;
3530 hdr->ifi_flags = dev_get_flags(dev);
3531 hdr->ifi_change = 0;
3532
3533 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3534
3535 if (dev->addr_len)
3536 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3537
3538 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3539 if (dev->ifindex != dev->iflink)
3540 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3541
3542 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3543 if (protoinfo == NULL)
3544 goto nla_put_failure;
3545
3546 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3547
3548 ci.max_reasm_len = IPV6_MAXPLEN;
3549 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3550 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3551 ci.reachable_time = idev->nd_parms->reachable_time;
3552 ci.retrans_time = idev->nd_parms->retrans_time;
3553 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3554
3555 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3556 if (nla == NULL)
3557 goto nla_put_failure;
3558 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3559
3560 /* XXX - MC not implemented */
3561
3562 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3563 if (nla == NULL)
3564 goto nla_put_failure;
3565 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3566
3567 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3568 if (nla == NULL)
3569 goto nla_put_failure;
3570 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3571
3572 nla_nest_end(skb, protoinfo);
3573 return nlmsg_end(skb, nlh);
3574
3575 nla_put_failure:
3576 nlmsg_cancel(skb, nlh);
3577 return -EMSGSIZE;
3578 }
3579
3580 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3581 {
3582 int idx, err;
3583 int s_idx = cb->args[0];
3584 struct net_device *dev;
3585 struct inet6_dev *idev;
3586
3587 read_lock(&dev_base_lock);
3588 idx = 0;
3589 for_each_netdev(&init_net, dev) {
3590 if (idx < s_idx)
3591 goto cont;
3592 if ((idev = in6_dev_get(dev)) == NULL)
3593 goto cont;
3594 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3595 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3596 in6_dev_put(idev);
3597 if (err <= 0)
3598 break;
3599 cont:
3600 idx++;
3601 }
3602 read_unlock(&dev_base_lock);
3603 cb->args[0] = idx;
3604
3605 return skb->len;
3606 }
3607
3608 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3609 {
3610 struct sk_buff *skb;
3611 int err = -ENOBUFS;
3612
3613 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3614 if (skb == NULL)
3615 goto errout;
3616
3617 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3618 if (err < 0) {
3619 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3620 WARN_ON(err == -EMSGSIZE);
3621 kfree_skb(skb);
3622 goto errout;
3623 }
3624 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3625 errout:
3626 if (err < 0)
3627 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3628 }
3629
3630 static inline size_t inet6_prefix_nlmsg_size(void)
3631 {
3632 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3633 + nla_total_size(sizeof(struct in6_addr))
3634 + nla_total_size(sizeof(struct prefix_cacheinfo));
3635 }
3636
3637 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3638 struct prefix_info *pinfo, u32 pid, u32 seq,
3639 int event, unsigned int flags)
3640 {
3641 struct prefixmsg *pmsg;
3642 struct nlmsghdr *nlh;
3643 struct prefix_cacheinfo ci;
3644
3645 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3646 if (nlh == NULL)
3647 return -EMSGSIZE;
3648
3649 pmsg = nlmsg_data(nlh);
3650 pmsg->prefix_family = AF_INET6;
3651 pmsg->prefix_pad1 = 0;
3652 pmsg->prefix_pad2 = 0;
3653 pmsg->prefix_ifindex = idev->dev->ifindex;
3654 pmsg->prefix_len = pinfo->prefix_len;
3655 pmsg->prefix_type = pinfo->type;
3656 pmsg->prefix_pad3 = 0;
3657 pmsg->prefix_flags = 0;
3658 if (pinfo->onlink)
3659 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3660 if (pinfo->autoconf)
3661 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3662
3663 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3664
3665 ci.preferred_time = ntohl(pinfo->prefered);
3666 ci.valid_time = ntohl(pinfo->valid);
3667 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3668
3669 return nlmsg_end(skb, nlh);
3670
3671 nla_put_failure:
3672 nlmsg_cancel(skb, nlh);
3673 return -EMSGSIZE;
3674 }
3675
3676 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3677 struct prefix_info *pinfo)
3678 {
3679 struct sk_buff *skb;
3680 int err = -ENOBUFS;
3681
3682 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3683 if (skb == NULL)
3684 goto errout;
3685
3686 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3687 if (err < 0) {
3688 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3689 WARN_ON(err == -EMSGSIZE);
3690 kfree_skb(skb);
3691 goto errout;
3692 }
3693 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3694 errout:
3695 if (err < 0)
3696 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3697 }
3698
3699 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3700 {
3701 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3702
3703 switch (event) {
3704 case RTM_NEWADDR:
3705 /*
3706 * If the address was optimistic
3707 * we inserted the route at the start of
3708 * our DAD process, so we don't need
3709 * to do it again
3710 */
3711 if (!(ifp->rt->rt6i_node))
3712 ip6_ins_rt(ifp->rt);
3713 if (ifp->idev->cnf.forwarding)
3714 addrconf_join_anycast(ifp);
3715 break;
3716 case RTM_DELADDR:
3717 if (ifp->idev->cnf.forwarding)
3718 addrconf_leave_anycast(ifp);
3719 addrconf_leave_solict(ifp->idev, &ifp->addr);
3720 dst_hold(&ifp->rt->u.dst);
3721 if (ip6_del_rt(ifp->rt))
3722 dst_free(&ifp->rt->u.dst);
3723 break;
3724 }
3725 }
3726
3727 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3728 {
3729 rcu_read_lock_bh();
3730 if (likely(ifp->idev->dead == 0))
3731 __ipv6_ifa_notify(event, ifp);
3732 rcu_read_unlock_bh();
3733 }
3734
3735 #ifdef CONFIG_SYSCTL
3736
3737 static
3738 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3739 void __user *buffer, size_t *lenp, loff_t *ppos)
3740 {
3741 int *valp = ctl->data;
3742 int val = *valp;
3743 int ret;
3744
3745 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3746
3747 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3748 if (valp != &ipv6_devconf.forwarding) {
3749 if ((!*valp) ^ (!val)) {
3750 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3751 if (idev == NULL)
3752 return ret;
3753 dev_forward_change(idev);
3754 }
3755 } else {
3756 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3757 addrconf_forward_change();
3758 }
3759 if (*valp)
3760 rt6_purge_dflt_routers();
3761 }
3762
3763 return ret;
3764 }
3765
3766 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3767 int __user *name, int nlen,
3768 void __user *oldval,
3769 size_t __user *oldlenp,
3770 void __user *newval, size_t newlen)
3771 {
3772 int *valp = table->data;
3773 int new;
3774
3775 if (!newval || !newlen)
3776 return 0;
3777 if (newlen != sizeof(int))
3778 return -EINVAL;
3779 if (get_user(new, (int __user *)newval))
3780 return -EFAULT;
3781 if (new == *valp)
3782 return 0;
3783 if (oldval && oldlenp) {
3784 size_t len;
3785 if (get_user(len, oldlenp))
3786 return -EFAULT;
3787 if (len) {
3788 if (len > table->maxlen)
3789 len = table->maxlen;
3790 if (copy_to_user(oldval, valp, len))
3791 return -EFAULT;
3792 if (put_user(len, oldlenp))
3793 return -EFAULT;
3794 }
3795 }
3796
3797 if (valp != &ipv6_devconf_dflt.forwarding) {
3798 if (valp != &ipv6_devconf.forwarding) {
3799 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3800 int changed;
3801 if (unlikely(idev == NULL))
3802 return -ENODEV;
3803 changed = (!*valp) ^ (!new);
3804 *valp = new;
3805 if (changed)
3806 dev_forward_change(idev);
3807 } else {
3808 *valp = new;
3809 addrconf_forward_change();
3810 }
3811
3812 if (*valp)
3813 rt6_purge_dflt_routers();
3814 } else
3815 *valp = new;
3816
3817 return 1;
3818 }
3819
3820 static struct addrconf_sysctl_table
3821 {
3822 struct ctl_table_header *sysctl_header;
3823 ctl_table addrconf_vars[__NET_IPV6_MAX];
3824 ctl_table addrconf_dev[2];
3825 ctl_table addrconf_conf_dir[2];
3826 ctl_table addrconf_proto_dir[2];
3827 ctl_table addrconf_root_dir[2];
3828 } addrconf_sysctl __read_mostly = {
3829 .sysctl_header = NULL,
3830 .addrconf_vars = {
3831 {
3832 .ctl_name = NET_IPV6_FORWARDING,
3833 .procname = "forwarding",
3834 .data = &ipv6_devconf.forwarding,
3835 .maxlen = sizeof(int),
3836 .mode = 0644,
3837 .proc_handler = &addrconf_sysctl_forward,
3838 .strategy = &addrconf_sysctl_forward_strategy,
3839 },
3840 {
3841 .ctl_name = NET_IPV6_HOP_LIMIT,
3842 .procname = "hop_limit",
3843 .data = &ipv6_devconf.hop_limit,
3844 .maxlen = sizeof(int),
3845 .mode = 0644,
3846 .proc_handler = proc_dointvec,
3847 },
3848 {
3849 .ctl_name = NET_IPV6_MTU,
3850 .procname = "mtu",
3851 .data = &ipv6_devconf.mtu6,
3852 .maxlen = sizeof(int),
3853 .mode = 0644,
3854 .proc_handler = &proc_dointvec,
3855 },
3856 {
3857 .ctl_name = NET_IPV6_ACCEPT_RA,
3858 .procname = "accept_ra",
3859 .data = &ipv6_devconf.accept_ra,
3860 .maxlen = sizeof(int),
3861 .mode = 0644,
3862 .proc_handler = &proc_dointvec,
3863 },
3864 {
3865 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3866 .procname = "accept_redirects",
3867 .data = &ipv6_devconf.accept_redirects,
3868 .maxlen = sizeof(int),
3869 .mode = 0644,
3870 .proc_handler = &proc_dointvec,
3871 },
3872 {
3873 .ctl_name = NET_IPV6_AUTOCONF,
3874 .procname = "autoconf",
3875 .data = &ipv6_devconf.autoconf,
3876 .maxlen = sizeof(int),
3877 .mode = 0644,
3878 .proc_handler = &proc_dointvec,
3879 },
3880 {
3881 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3882 .procname = "dad_transmits",
3883 .data = &ipv6_devconf.dad_transmits,
3884 .maxlen = sizeof(int),
3885 .mode = 0644,
3886 .proc_handler = &proc_dointvec,
3887 },
3888 {
3889 .ctl_name = NET_IPV6_RTR_SOLICITS,
3890 .procname = "router_solicitations",
3891 .data = &ipv6_devconf.rtr_solicits,
3892 .maxlen = sizeof(int),
3893 .mode = 0644,
3894 .proc_handler = &proc_dointvec,
3895 },
3896 {
3897 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3898 .procname = "router_solicitation_interval",
3899 .data = &ipv6_devconf.rtr_solicit_interval,
3900 .maxlen = sizeof(int),
3901 .mode = 0644,
3902 .proc_handler = &proc_dointvec_jiffies,
3903 .strategy = &sysctl_jiffies,
3904 },
3905 {
3906 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3907 .procname = "router_solicitation_delay",
3908 .data = &ipv6_devconf.rtr_solicit_delay,
3909 .maxlen = sizeof(int),
3910 .mode = 0644,
3911 .proc_handler = &proc_dointvec_jiffies,
3912 .strategy = &sysctl_jiffies,
3913 },
3914 {
3915 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3916 .procname = "force_mld_version",
3917 .data = &ipv6_devconf.force_mld_version,
3918 .maxlen = sizeof(int),
3919 .mode = 0644,
3920 .proc_handler = &proc_dointvec,
3921 },
3922 #ifdef CONFIG_IPV6_PRIVACY
3923 {
3924 .ctl_name = NET_IPV6_USE_TEMPADDR,
3925 .procname = "use_tempaddr",
3926 .data = &ipv6_devconf.use_tempaddr,
3927 .maxlen = sizeof(int),
3928 .mode = 0644,
3929 .proc_handler = &proc_dointvec,
3930 },
3931 {
3932 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3933 .procname = "temp_valid_lft",
3934 .data = &ipv6_devconf.temp_valid_lft,
3935 .maxlen = sizeof(int),
3936 .mode = 0644,
3937 .proc_handler = &proc_dointvec,
3938 },
3939 {
3940 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3941 .procname = "temp_prefered_lft",
3942 .data = &ipv6_devconf.temp_prefered_lft,
3943 .maxlen = sizeof(int),
3944 .mode = 0644,
3945 .proc_handler = &proc_dointvec,
3946 },
3947 {
3948 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3949 .procname = "regen_max_retry",
3950 .data = &ipv6_devconf.regen_max_retry,
3951 .maxlen = sizeof(int),
3952 .mode = 0644,
3953 .proc_handler = &proc_dointvec,
3954 },
3955 {
3956 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3957 .procname = "max_desync_factor",
3958 .data = &ipv6_devconf.max_desync_factor,
3959 .maxlen = sizeof(int),
3960 .mode = 0644,
3961 .proc_handler = &proc_dointvec,
3962 },
3963 #endif
3964 {
3965 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3966 .procname = "max_addresses",
3967 .data = &ipv6_devconf.max_addresses,
3968 .maxlen = sizeof(int),
3969 .mode = 0644,
3970 .proc_handler = &proc_dointvec,
3971 },
3972 {
3973 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3974 .procname = "accept_ra_defrtr",
3975 .data = &ipv6_devconf.accept_ra_defrtr,
3976 .maxlen = sizeof(int),
3977 .mode = 0644,
3978 .proc_handler = &proc_dointvec,
3979 },
3980 {
3981 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3982 .procname = "accept_ra_pinfo",
3983 .data = &ipv6_devconf.accept_ra_pinfo,
3984 .maxlen = sizeof(int),
3985 .mode = 0644,
3986 .proc_handler = &proc_dointvec,
3987 },
3988 #ifdef CONFIG_IPV6_ROUTER_PREF
3989 {
3990 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3991 .procname = "accept_ra_rtr_pref",
3992 .data = &ipv6_devconf.accept_ra_rtr_pref,
3993 .maxlen = sizeof(int),
3994 .mode = 0644,
3995 .proc_handler = &proc_dointvec,
3996 },
3997 {
3998 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
3999 .procname = "router_probe_interval",
4000 .data = &ipv6_devconf.rtr_probe_interval,
4001 .maxlen = sizeof(int),
4002 .mode = 0644,
4003 .proc_handler = &proc_dointvec_jiffies,
4004 .strategy = &sysctl_jiffies,
4005 },
4006 #ifdef CONFIG_IPV6_ROUTE_INFO
4007 {
4008 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4009 .procname = "accept_ra_rt_info_max_plen",
4010 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4011 .maxlen = sizeof(int),
4012 .mode = 0644,
4013 .proc_handler = &proc_dointvec,
4014 },
4015 #endif
4016 #endif
4017 {
4018 .ctl_name = NET_IPV6_PROXY_NDP,
4019 .procname = "proxy_ndp",
4020 .data = &ipv6_devconf.proxy_ndp,
4021 .maxlen = sizeof(int),
4022 .mode = 0644,
4023 .proc_handler = &proc_dointvec,
4024 },
4025 {
4026 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4027 .procname = "accept_source_route",
4028 .data = &ipv6_devconf.accept_source_route,
4029 .maxlen = sizeof(int),
4030 .mode = 0644,
4031 .proc_handler = &proc_dointvec,
4032 },
4033 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4034 {
4035 .ctl_name = CTL_UNNUMBERED,
4036 .procname = "optimistic_dad",
4037 .data = &ipv6_devconf.optimistic_dad,
4038 .maxlen = sizeof(int),
4039 .mode = 0644,
4040 .proc_handler = &proc_dointvec,
4041
4042 },
4043 #endif
4044 {
4045 .ctl_name = 0, /* sentinel */
4046 }
4047 },
4048 .addrconf_dev = {
4049 {
4050 .ctl_name = NET_PROTO_CONF_ALL,
4051 .procname = "all",
4052 .mode = 0555,
4053 .child = addrconf_sysctl.addrconf_vars,
4054 },
4055 {
4056 .ctl_name = 0, /* sentinel */
4057 }
4058 },
4059 .addrconf_conf_dir = {
4060 {
4061 .ctl_name = NET_IPV6_CONF,
4062 .procname = "conf",
4063 .mode = 0555,
4064 .child = addrconf_sysctl.addrconf_dev,
4065 },
4066 {
4067 .ctl_name = 0, /* sentinel */
4068 }
4069 },
4070 .addrconf_proto_dir = {
4071 {
4072 .ctl_name = NET_IPV6,
4073 .procname = "ipv6",
4074 .mode = 0555,
4075 .child = addrconf_sysctl.addrconf_conf_dir,
4076 },
4077 {
4078 .ctl_name = 0, /* sentinel */
4079 }
4080 },
4081 .addrconf_root_dir = {
4082 {
4083 .ctl_name = CTL_NET,
4084 .procname = "net",
4085 .mode = 0555,
4086 .child = addrconf_sysctl.addrconf_proto_dir,
4087 },
4088 {
4089 .ctl_name = 0, /* sentinel */
4090 }
4091 },
4092 };
4093
4094 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4095 {
4096 int i;
4097 struct net_device *dev = idev ? idev->dev : NULL;
4098 struct addrconf_sysctl_table *t;
4099 char *dev_name = NULL;
4100
4101 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4102 if (t == NULL)
4103 return;
4104 for (i=0; t->addrconf_vars[i].data; i++) {
4105 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4106 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4107 }
4108 if (dev) {
4109 dev_name = dev->name;
4110 t->addrconf_dev[0].ctl_name = dev->ifindex;
4111 } else {
4112 dev_name = "default";
4113 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4114 }
4115
4116 /*
4117 * Make a copy of dev_name, because '.procname' is regarded as const
4118 * by sysctl and we wouldn't want anyone to change it under our feet
4119 * (see SIOCSIFNAME).
4120 */
4121 dev_name = kstrdup(dev_name, GFP_KERNEL);
4122 if (!dev_name)
4123 goto free;
4124
4125 t->addrconf_dev[0].procname = dev_name;
4126
4127 t->addrconf_dev[0].child = t->addrconf_vars;
4128 t->addrconf_conf_dir[0].child = t->addrconf_dev;
4129 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
4130 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
4131
4132 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
4133 if (t->sysctl_header == NULL)
4134 goto free_procname;
4135 else
4136 p->sysctl = t;
4137 return;
4138
4139 /* error path */
4140 free_procname:
4141 kfree(dev_name);
4142 free:
4143 kfree(t);
4144
4145 return;
4146 }
4147
4148 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4149 {
4150 if (p->sysctl) {
4151 struct addrconf_sysctl_table *t = p->sysctl;
4152 p->sysctl = NULL;
4153 unregister_sysctl_table(t->sysctl_header);
4154 kfree(t->addrconf_dev[0].procname);
4155 kfree(t);
4156 }
4157 }
4158
4159
4160 #endif
4161
4162 /*
4163 * Device notifier
4164 */
4165
4166 int register_inet6addr_notifier(struct notifier_block *nb)
4167 {
4168 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4169 }
4170
4171 EXPORT_SYMBOL(register_inet6addr_notifier);
4172
4173 int unregister_inet6addr_notifier(struct notifier_block *nb)
4174 {
4175 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4176 }
4177
4178 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4179
4180 /*
4181 * Init / cleanup code
4182 */
4183
4184 int __init addrconf_init(void)
4185 {
4186 int err = 0;
4187
4188 /* The addrconf netdev notifier requires that loopback_dev
4189 * has it's ipv6 private information allocated and setup
4190 * before it can bring up and give link-local addresses
4191 * to other devices which are up.
4192 *
4193 * Unfortunately, loopback_dev is not necessarily the first
4194 * entry in the global dev_base list of net devices. In fact,
4195 * it is likely to be the very last entry on that list.
4196 * So this causes the notifier registry below to try and
4197 * give link-local addresses to all devices besides loopback_dev
4198 * first, then loopback_dev, which cases all the non-loopback_dev
4199 * devices to fail to get a link-local address.
4200 *
4201 * So, as a temporary fix, allocate the ipv6 structure for
4202 * loopback_dev first by hand.
4203 * Longer term, all of the dependencies ipv6 has upon the loopback
4204 * device and it being up should be removed.
4205 */
4206 rtnl_lock();
4207 if (!ipv6_add_dev(init_net.loopback_dev))
4208 err = -ENOMEM;
4209 rtnl_unlock();
4210 if (err)
4211 return err;
4212
4213 ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4214 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4215 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4216 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4217 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4218 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4219 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4220 #endif
4221
4222 register_netdevice_notifier(&ipv6_dev_notf);
4223
4224 addrconf_verify(0);
4225
4226 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4227 if (err < 0)
4228 goto errout;
4229
4230 /* Only the first call to __rtnl_register can fail */
4231 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4232 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4233 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4234 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4235 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4236
4237 #ifdef CONFIG_SYSCTL
4238 addrconf_sysctl.sysctl_header =
4239 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
4240 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4241 #endif
4242
4243 return 0;
4244 errout:
4245 unregister_netdevice_notifier(&ipv6_dev_notf);
4246
4247 return err;
4248 }
4249
4250 void __exit addrconf_cleanup(void)
4251 {
4252 struct net_device *dev;
4253 struct inet6_ifaddr *ifa;
4254 int i;
4255
4256 unregister_netdevice_notifier(&ipv6_dev_notf);
4257
4258 #ifdef CONFIG_SYSCTL
4259 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4260 addrconf_sysctl_unregister(&ipv6_devconf);
4261 #endif
4262
4263 rtnl_lock();
4264
4265 /*
4266 * clean dev list.
4267 */
4268
4269 for_each_netdev(&init_net, dev) {
4270 if (__in6_dev_get(dev) == NULL)
4271 continue;
4272 addrconf_ifdown(dev, 1);
4273 }
4274 addrconf_ifdown(init_net.loopback_dev, 2);
4275
4276 /*
4277 * Check hash table.
4278 */
4279
4280 write_lock_bh(&addrconf_hash_lock);
4281 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4282 for (ifa=inet6_addr_lst[i]; ifa; ) {
4283 struct inet6_ifaddr *bifa;
4284
4285 bifa = ifa;
4286 ifa = ifa->lst_next;
4287 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4288 /* Do not free it; something is wrong.
4289 Now we can investigate it with debugger.
4290 */
4291 }
4292 }
4293 write_unlock_bh(&addrconf_hash_lock);
4294
4295 del_timer(&addr_chk_timer);
4296
4297 rtnl_unlock();
4298 }
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