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[NETNS][IPV6] rt6_info - make rt6_info accessed as a pointer
[deliverable/linux.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17 /*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
41 */
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/socket.h>
46 #include <linux/sockios.h>
47 #include <linux/net.h>
48 #include <linux/in6.h>
49 #include <linux/netdevice.h>
50 #include <linux/if_addr.h>
51 #include <linux/if_arp.h>
52 #include <linux/if_arcnet.h>
53 #include <linux/if_infiniband.h>
54 #include <linux/route.h>
55 #include <linux/inetdevice.h>
56 #include <linux/init.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64
65 #include <net/net_namespace.h>
66 #include <net/sock.h>
67 #include <net/snmp.h>
68
69 #include <net/ipv6.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
74 #include <net/tcp.h>
75 #include <net/ip.h>
76 #include <net/netlink.h>
77 #include <net/pkt_sched.h>
78 #include <linux/if_tunnel.h>
79 #include <linux/rtnetlink.h>
80
81 #ifdef CONFIG_IPV6_PRIVACY
82 #include <linux/random.h>
83 #endif
84
85 #include <asm/uaccess.h>
86 #include <asm/unaligned.h>
87
88 #include <linux/proc_fs.h>
89 #include <linux/seq_file.h>
90
91 /* Set to 3 to get tracing... */
92 #define ACONF_DEBUG 2
93
94 #if ACONF_DEBUG >= 3
95 #define ADBG(x) printk x
96 #else
97 #define ADBG(x)
98 #endif
99
100 #define INFINITY_LIFE_TIME 0xFFFFFFFF
101 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102
103 #ifdef CONFIG_SYSCTL
104 static void addrconf_sysctl_register(struct inet6_dev *idev);
105 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
106 #else
107 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
108 {
109 }
110
111 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
112 {
113 }
114 #endif
115
116 #ifdef CONFIG_IPV6_PRIVACY
117 static int __ipv6_regen_rndid(struct inet6_dev *idev);
118 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
119 static void ipv6_regen_rndid(unsigned long data);
120
121 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
122 #endif
123
124 static int ipv6_count_addresses(struct inet6_dev *idev);
125
126 /*
127 * Configured unicast address hash table
128 */
129 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
130 static DEFINE_RWLOCK(addrconf_hash_lock);
131
132 static void addrconf_verify(unsigned long);
133
134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
135 static DEFINE_SPINLOCK(addrconf_verify_lock);
136
137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139
140 static int addrconf_ifdown(struct net_device *dev, int how);
141
142 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
143 static void addrconf_dad_timer(unsigned long data);
144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
145 static void addrconf_dad_run(struct inet6_dev *idev);
146 static void addrconf_rs_timer(unsigned long data);
147 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
149
150 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
151 struct prefix_info *pinfo);
152 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
153 struct net_device *dev);
154
155 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
156
157 struct ipv6_devconf ipv6_devconf __read_mostly = {
158 .forwarding = 0,
159 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
160 .mtu6 = IPV6_MIN_MTU,
161 .accept_ra = 1,
162 .accept_redirects = 1,
163 .autoconf = 1,
164 .force_mld_version = 0,
165 .dad_transmits = 1,
166 .rtr_solicits = MAX_RTR_SOLICITATIONS,
167 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
168 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
169 #ifdef CONFIG_IPV6_PRIVACY
170 .use_tempaddr = 0,
171 .temp_valid_lft = TEMP_VALID_LIFETIME,
172 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
173 .regen_max_retry = REGEN_MAX_RETRY,
174 .max_desync_factor = MAX_DESYNC_FACTOR,
175 #endif
176 .max_addresses = IPV6_MAX_ADDRESSES,
177 .accept_ra_defrtr = 1,
178 .accept_ra_pinfo = 1,
179 #ifdef CONFIG_IPV6_ROUTER_PREF
180 .accept_ra_rtr_pref = 1,
181 .rtr_probe_interval = 60 * HZ,
182 #ifdef CONFIG_IPV6_ROUTE_INFO
183 .accept_ra_rt_info_max_plen = 0,
184 #endif
185 #endif
186 .proxy_ndp = 0,
187 .accept_source_route = 0, /* we do not accept RH0 by default. */
188 };
189
190 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
191 .forwarding = 0,
192 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
193 .mtu6 = IPV6_MIN_MTU,
194 .accept_ra = 1,
195 .accept_redirects = 1,
196 .autoconf = 1,
197 .dad_transmits = 1,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
201 #ifdef CONFIG_IPV6_PRIVACY
202 .use_tempaddr = 0,
203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
207 #endif
208 .max_addresses = IPV6_MAX_ADDRESSES,
209 .accept_ra_defrtr = 1,
210 .accept_ra_pinfo = 1,
211 #ifdef CONFIG_IPV6_ROUTER_PREF
212 .accept_ra_rtr_pref = 1,
213 .rtr_probe_interval = 60 * HZ,
214 #ifdef CONFIG_IPV6_ROUTE_INFO
215 .accept_ra_rt_info_max_plen = 0,
216 #endif
217 #endif
218 .proxy_ndp = 0,
219 .accept_source_route = 0, /* we do not accept RH0 by default. */
220 };
221
222 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
223 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
224 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
225
226 /* Check if a valid qdisc is available */
227 static inline int addrconf_qdisc_ok(struct net_device *dev)
228 {
229 return (dev->qdisc != &noop_qdisc);
230 }
231
232 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
233 {
234 if (del_timer(&ifp->timer))
235 __in6_ifa_put(ifp);
236 }
237
238 enum addrconf_timer_t
239 {
240 AC_NONE,
241 AC_DAD,
242 AC_RS,
243 };
244
245 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
246 enum addrconf_timer_t what,
247 unsigned long when)
248 {
249 if (!del_timer(&ifp->timer))
250 in6_ifa_hold(ifp);
251
252 switch (what) {
253 case AC_DAD:
254 ifp->timer.function = addrconf_dad_timer;
255 break;
256 case AC_RS:
257 ifp->timer.function = addrconf_rs_timer;
258 break;
259 default:;
260 }
261 ifp->timer.expires = jiffies + when;
262 add_timer(&ifp->timer);
263 }
264
265 static int snmp6_alloc_dev(struct inet6_dev *idev)
266 {
267 if (snmp_mib_init((void **)idev->stats.ipv6,
268 sizeof(struct ipstats_mib)) < 0)
269 goto err_ip;
270 if (snmp_mib_init((void **)idev->stats.icmpv6,
271 sizeof(struct icmpv6_mib)) < 0)
272 goto err_icmp;
273 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
274 sizeof(struct icmpv6msg_mib)) < 0)
275 goto err_icmpmsg;
276
277 return 0;
278
279 err_icmpmsg:
280 snmp_mib_free((void **)idev->stats.icmpv6);
281 err_icmp:
282 snmp_mib_free((void **)idev->stats.ipv6);
283 err_ip:
284 return -ENOMEM;
285 }
286
287 static void snmp6_free_dev(struct inet6_dev *idev)
288 {
289 snmp_mib_free((void **)idev->stats.icmpv6msg);
290 snmp_mib_free((void **)idev->stats.icmpv6);
291 snmp_mib_free((void **)idev->stats.ipv6);
292 }
293
294 /* Nobody refers to this device, we may destroy it. */
295
296 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
297 {
298 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
299 kfree(idev);
300 }
301
302 void in6_dev_finish_destroy(struct inet6_dev *idev)
303 {
304 struct net_device *dev = idev->dev;
305 BUG_TRAP(idev->addr_list==NULL);
306 BUG_TRAP(idev->mc_list==NULL);
307 #ifdef NET_REFCNT_DEBUG
308 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
309 #endif
310 dev_put(dev);
311 if (!idev->dead) {
312 printk("Freeing alive inet6 device %p\n", idev);
313 return;
314 }
315 snmp6_free_dev(idev);
316 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
317 }
318
319 EXPORT_SYMBOL(in6_dev_finish_destroy);
320
321 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
322 {
323 struct inet6_dev *ndev;
324 struct in6_addr maddr;
325
326 ASSERT_RTNL();
327
328 if (dev->mtu < IPV6_MIN_MTU)
329 return NULL;
330
331 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
332
333 if (ndev == NULL)
334 return NULL;
335
336 rwlock_init(&ndev->lock);
337 ndev->dev = dev;
338 memcpy(&ndev->cnf, dev->nd_net->ipv6.devconf_dflt, sizeof(ndev->cnf));
339 ndev->cnf.mtu6 = dev->mtu;
340 ndev->cnf.sysctl = NULL;
341 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
342 if (ndev->nd_parms == NULL) {
343 kfree(ndev);
344 return NULL;
345 }
346 /* We refer to the device */
347 dev_hold(dev);
348
349 if (snmp6_alloc_dev(ndev) < 0) {
350 ADBG((KERN_WARNING
351 "%s(): cannot allocate memory for statistics; dev=%s.\n",
352 __FUNCTION__, dev->name));
353 neigh_parms_release(&nd_tbl, ndev->nd_parms);
354 ndev->dead = 1;
355 in6_dev_finish_destroy(ndev);
356 return NULL;
357 }
358
359 if (snmp6_register_dev(ndev) < 0) {
360 ADBG((KERN_WARNING
361 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
362 __FUNCTION__, dev->name));
363 neigh_parms_release(&nd_tbl, ndev->nd_parms);
364 ndev->dead = 1;
365 in6_dev_finish_destroy(ndev);
366 return NULL;
367 }
368
369 /* One reference from device. We must do this before
370 * we invoke __ipv6_regen_rndid().
371 */
372 in6_dev_hold(ndev);
373
374 #ifdef CONFIG_IPV6_PRIVACY
375 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
376 if ((dev->flags&IFF_LOOPBACK) ||
377 dev->type == ARPHRD_TUNNEL ||
378 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
379 dev->type == ARPHRD_SIT ||
380 #endif
381 dev->type == ARPHRD_NONE) {
382 printk(KERN_INFO
383 "%s: Disabled Privacy Extensions\n",
384 dev->name);
385 ndev->cnf.use_tempaddr = -1;
386
387 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
388 printk(KERN_INFO
389 "%s: Disabled Multicast RS\n",
390 dev->name);
391 ndev->cnf.rtr_solicits = 0;
392 }
393 } else {
394 in6_dev_hold(ndev);
395 ipv6_regen_rndid((unsigned long) ndev);
396 }
397 #endif
398
399 if (netif_running(dev) && addrconf_qdisc_ok(dev))
400 ndev->if_flags |= IF_READY;
401
402 ipv6_mc_init_dev(ndev);
403 ndev->tstamp = jiffies;
404 addrconf_sysctl_register(ndev);
405 /* protected by rtnl_lock */
406 rcu_assign_pointer(dev->ip6_ptr, ndev);
407
408 /* Join all-node multicast group */
409 ipv6_addr_all_nodes(&maddr);
410 ipv6_dev_mc_inc(dev, &maddr);
411
412 return ndev;
413 }
414
415 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
416 {
417 struct inet6_dev *idev;
418
419 ASSERT_RTNL();
420
421 if ((idev = __in6_dev_get(dev)) == NULL) {
422 if ((idev = ipv6_add_dev(dev)) == NULL)
423 return NULL;
424 }
425
426 if (dev->flags&IFF_UP)
427 ipv6_mc_up(idev);
428 return idev;
429 }
430
431 #ifdef CONFIG_SYSCTL
432 static void dev_forward_change(struct inet6_dev *idev)
433 {
434 struct net_device *dev;
435 struct inet6_ifaddr *ifa;
436 struct in6_addr addr;
437
438 if (!idev)
439 return;
440 dev = idev->dev;
441 if (dev && (dev->flags & IFF_MULTICAST)) {
442 ipv6_addr_all_routers(&addr);
443
444 if (idev->cnf.forwarding)
445 ipv6_dev_mc_inc(dev, &addr);
446 else
447 ipv6_dev_mc_dec(dev, &addr);
448 }
449 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
450 if (ifa->flags&IFA_F_TENTATIVE)
451 continue;
452 if (idev->cnf.forwarding)
453 addrconf_join_anycast(ifa);
454 else
455 addrconf_leave_anycast(ifa);
456 }
457 }
458
459
460 static void addrconf_forward_change(struct net *net, __s32 newf)
461 {
462 struct net_device *dev;
463 struct inet6_dev *idev;
464
465 read_lock(&dev_base_lock);
466 for_each_netdev(net, dev) {
467 rcu_read_lock();
468 idev = __in6_dev_get(dev);
469 if (idev) {
470 int changed = (!idev->cnf.forwarding) ^ (!newf);
471 idev->cnf.forwarding = newf;
472 if (changed)
473 dev_forward_change(idev);
474 }
475 rcu_read_unlock();
476 }
477 read_unlock(&dev_base_lock);
478 }
479
480 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
481 {
482 struct net *net;
483
484 net = (struct net *)table->extra2;
485 if (p == &net->ipv6.devconf_dflt->forwarding)
486 return;
487
488 if (p == &net->ipv6.devconf_all->forwarding) {
489 __s32 newf = net->ipv6.devconf_all->forwarding;
490 net->ipv6.devconf_dflt->forwarding = newf;
491 addrconf_forward_change(net, newf);
492 } else if ((!*p) ^ (!old))
493 dev_forward_change((struct inet6_dev *)table->extra1);
494
495 if (*p)
496 rt6_purge_dflt_routers(net);
497 }
498 #endif
499
500 /* Nobody refers to this ifaddr, destroy it */
501
502 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
503 {
504 BUG_TRAP(ifp->if_next==NULL);
505 BUG_TRAP(ifp->lst_next==NULL);
506 #ifdef NET_REFCNT_DEBUG
507 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
508 #endif
509
510 in6_dev_put(ifp->idev);
511
512 if (del_timer(&ifp->timer))
513 printk("Timer is still running, when freeing ifa=%p\n", ifp);
514
515 if (!ifp->dead) {
516 printk("Freeing alive inet6 address %p\n", ifp);
517 return;
518 }
519 dst_release(&ifp->rt->u.dst);
520
521 kfree(ifp);
522 }
523
524 static void
525 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
526 {
527 struct inet6_ifaddr *ifa, **ifap;
528 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
529
530 /*
531 * Each device address list is sorted in order of scope -
532 * global before linklocal.
533 */
534 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
535 ifap = &ifa->if_next) {
536 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
537 break;
538 }
539
540 ifp->if_next = *ifap;
541 *ifap = ifp;
542 }
543
544 /* On success it returns ifp with increased reference count */
545
546 static struct inet6_ifaddr *
547 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
548 int scope, u32 flags)
549 {
550 struct inet6_ifaddr *ifa = NULL;
551 struct rt6_info *rt;
552 int hash;
553 int err = 0;
554
555 rcu_read_lock_bh();
556 if (idev->dead) {
557 err = -ENODEV; /*XXX*/
558 goto out2;
559 }
560
561 write_lock(&addrconf_hash_lock);
562
563 /* Ignore adding duplicate addresses on an interface */
564 if (ipv6_chk_same_addr(&init_net, addr, idev->dev)) {
565 ADBG(("ipv6_add_addr: already assigned\n"));
566 err = -EEXIST;
567 goto out;
568 }
569
570 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
571
572 if (ifa == NULL) {
573 ADBG(("ipv6_add_addr: malloc failed\n"));
574 err = -ENOBUFS;
575 goto out;
576 }
577
578 rt = addrconf_dst_alloc(idev, addr, 0);
579 if (IS_ERR(rt)) {
580 err = PTR_ERR(rt);
581 goto out;
582 }
583
584 ipv6_addr_copy(&ifa->addr, addr);
585
586 spin_lock_init(&ifa->lock);
587 init_timer(&ifa->timer);
588 ifa->timer.data = (unsigned long) ifa;
589 ifa->scope = scope;
590 ifa->prefix_len = pfxlen;
591 ifa->flags = flags | IFA_F_TENTATIVE;
592 ifa->cstamp = ifa->tstamp = jiffies;
593
594 ifa->rt = rt;
595
596 /*
597 * part one of RFC 4429, section 3.3
598 * We should not configure an address as
599 * optimistic if we do not yet know the link
600 * layer address of our nexhop router
601 */
602
603 if (rt->rt6i_nexthop == NULL)
604 ifa->flags &= ~IFA_F_OPTIMISTIC;
605
606 ifa->idev = idev;
607 in6_dev_hold(idev);
608 /* For caller */
609 in6_ifa_hold(ifa);
610
611 /* Add to big hash table */
612 hash = ipv6_addr_hash(addr);
613
614 ifa->lst_next = inet6_addr_lst[hash];
615 inet6_addr_lst[hash] = ifa;
616 in6_ifa_hold(ifa);
617 write_unlock(&addrconf_hash_lock);
618
619 write_lock(&idev->lock);
620 /* Add to inet6_dev unicast addr list. */
621 ipv6_link_dev_addr(idev, ifa);
622
623 #ifdef CONFIG_IPV6_PRIVACY
624 if (ifa->flags&IFA_F_TEMPORARY) {
625 ifa->tmp_next = idev->tempaddr_list;
626 idev->tempaddr_list = ifa;
627 in6_ifa_hold(ifa);
628 }
629 #endif
630
631 in6_ifa_hold(ifa);
632 write_unlock(&idev->lock);
633 out2:
634 rcu_read_unlock_bh();
635
636 if (likely(err == 0))
637 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
638 else {
639 kfree(ifa);
640 ifa = ERR_PTR(err);
641 }
642
643 return ifa;
644 out:
645 write_unlock(&addrconf_hash_lock);
646 goto out2;
647 }
648
649 /* This function wants to get referenced ifp and releases it before return */
650
651 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
652 {
653 struct inet6_ifaddr *ifa, **ifap;
654 struct inet6_dev *idev = ifp->idev;
655 int hash;
656 int deleted = 0, onlink = 0;
657 unsigned long expires = jiffies;
658
659 hash = ipv6_addr_hash(&ifp->addr);
660
661 ifp->dead = 1;
662
663 write_lock_bh(&addrconf_hash_lock);
664 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
665 ifap = &ifa->lst_next) {
666 if (ifa == ifp) {
667 *ifap = ifa->lst_next;
668 __in6_ifa_put(ifp);
669 ifa->lst_next = NULL;
670 break;
671 }
672 }
673 write_unlock_bh(&addrconf_hash_lock);
674
675 write_lock_bh(&idev->lock);
676 #ifdef CONFIG_IPV6_PRIVACY
677 if (ifp->flags&IFA_F_TEMPORARY) {
678 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
679 ifap = &ifa->tmp_next) {
680 if (ifa == ifp) {
681 *ifap = ifa->tmp_next;
682 if (ifp->ifpub) {
683 in6_ifa_put(ifp->ifpub);
684 ifp->ifpub = NULL;
685 }
686 __in6_ifa_put(ifp);
687 ifa->tmp_next = NULL;
688 break;
689 }
690 }
691 }
692 #endif
693
694 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
695 if (ifa == ifp) {
696 *ifap = ifa->if_next;
697 __in6_ifa_put(ifp);
698 ifa->if_next = NULL;
699 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
700 break;
701 deleted = 1;
702 continue;
703 } else if (ifp->flags & IFA_F_PERMANENT) {
704 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
705 ifp->prefix_len)) {
706 if (ifa->flags & IFA_F_PERMANENT) {
707 onlink = 1;
708 if (deleted)
709 break;
710 } else {
711 unsigned long lifetime;
712
713 if (!onlink)
714 onlink = -1;
715
716 spin_lock(&ifa->lock);
717 lifetime = min_t(unsigned long,
718 ifa->valid_lft, 0x7fffffffUL/HZ);
719 if (time_before(expires,
720 ifa->tstamp + lifetime * HZ))
721 expires = ifa->tstamp + lifetime * HZ;
722 spin_unlock(&ifa->lock);
723 }
724 }
725 }
726 ifap = &ifa->if_next;
727 }
728 write_unlock_bh(&idev->lock);
729
730 ipv6_ifa_notify(RTM_DELADDR, ifp);
731
732 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
733
734 addrconf_del_timer(ifp);
735
736 /*
737 * Purge or update corresponding prefix
738 *
739 * 1) we don't purge prefix here if address was not permanent.
740 * prefix is managed by its own lifetime.
741 * 2) if there're no addresses, delete prefix.
742 * 3) if there're still other permanent address(es),
743 * corresponding prefix is still permanent.
744 * 4) otherwise, update prefix lifetime to the
745 * longest valid lifetime among the corresponding
746 * addresses on the device.
747 * Note: subsequent RA will update lifetime.
748 *
749 * --yoshfuji
750 */
751 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
752 struct in6_addr prefix;
753 struct rt6_info *rt;
754
755 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
756 rt = rt6_lookup(&init_net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
757
758 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
759 if (onlink == 0) {
760 ip6_del_rt(rt);
761 rt = NULL;
762 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
763 rt->rt6i_expires = expires;
764 rt->rt6i_flags |= RTF_EXPIRES;
765 }
766 }
767 dst_release(&rt->u.dst);
768 }
769
770 in6_ifa_put(ifp);
771 }
772
773 #ifdef CONFIG_IPV6_PRIVACY
774 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
775 {
776 struct inet6_dev *idev = ifp->idev;
777 struct in6_addr addr, *tmpaddr;
778 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
779 int tmp_plen;
780 int ret = 0;
781 int max_addresses;
782 u32 addr_flags;
783
784 write_lock(&idev->lock);
785 if (ift) {
786 spin_lock_bh(&ift->lock);
787 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
788 spin_unlock_bh(&ift->lock);
789 tmpaddr = &addr;
790 } else {
791 tmpaddr = NULL;
792 }
793 retry:
794 in6_dev_hold(idev);
795 if (idev->cnf.use_tempaddr <= 0) {
796 write_unlock(&idev->lock);
797 printk(KERN_INFO
798 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
799 in6_dev_put(idev);
800 ret = -1;
801 goto out;
802 }
803 spin_lock_bh(&ifp->lock);
804 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
805 idev->cnf.use_tempaddr = -1; /*XXX*/
806 spin_unlock_bh(&ifp->lock);
807 write_unlock(&idev->lock);
808 printk(KERN_WARNING
809 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
810 in6_dev_put(idev);
811 ret = -1;
812 goto out;
813 }
814 in6_ifa_hold(ifp);
815 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
816 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
817 spin_unlock_bh(&ifp->lock);
818 write_unlock(&idev->lock);
819 printk(KERN_WARNING
820 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
821 in6_ifa_put(ifp);
822 in6_dev_put(idev);
823 ret = -1;
824 goto out;
825 }
826 memcpy(&addr.s6_addr[8], idev->rndid, 8);
827 tmp_valid_lft = min_t(__u32,
828 ifp->valid_lft,
829 idev->cnf.temp_valid_lft);
830 tmp_prefered_lft = min_t(__u32,
831 ifp->prefered_lft,
832 idev->cnf.temp_prefered_lft - desync_factor / HZ);
833 tmp_plen = ifp->prefix_len;
834 max_addresses = idev->cnf.max_addresses;
835 tmp_cstamp = ifp->cstamp;
836 tmp_tstamp = ifp->tstamp;
837 spin_unlock_bh(&ifp->lock);
838
839 write_unlock(&idev->lock);
840
841 addr_flags = IFA_F_TEMPORARY;
842 /* set in addrconf_prefix_rcv() */
843 if (ifp->flags & IFA_F_OPTIMISTIC)
844 addr_flags |= IFA_F_OPTIMISTIC;
845
846 ift = !max_addresses ||
847 ipv6_count_addresses(idev) < max_addresses ?
848 ipv6_add_addr(idev, &addr, tmp_plen,
849 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
850 addr_flags) : NULL;
851 if (!ift || IS_ERR(ift)) {
852 in6_ifa_put(ifp);
853 in6_dev_put(idev);
854 printk(KERN_INFO
855 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
856 tmpaddr = &addr;
857 write_lock(&idev->lock);
858 goto retry;
859 }
860
861 spin_lock_bh(&ift->lock);
862 ift->ifpub = ifp;
863 ift->valid_lft = tmp_valid_lft;
864 ift->prefered_lft = tmp_prefered_lft;
865 ift->cstamp = tmp_cstamp;
866 ift->tstamp = tmp_tstamp;
867 spin_unlock_bh(&ift->lock);
868
869 addrconf_dad_start(ift, 0);
870 in6_ifa_put(ift);
871 in6_dev_put(idev);
872 out:
873 return ret;
874 }
875 #endif
876
877 /*
878 * Choose an appropriate source address (RFC3484)
879 */
880 struct ipv6_saddr_score {
881 int addr_type;
882 unsigned int attrs;
883 int matchlen;
884 int scope;
885 unsigned int rule;
886 };
887
888 #define IPV6_SADDR_SCORE_LOCAL 0x0001
889 #define IPV6_SADDR_SCORE_PREFERRED 0x0004
890 #define IPV6_SADDR_SCORE_HOA 0x0008
891 #define IPV6_SADDR_SCORE_OIF 0x0010
892 #define IPV6_SADDR_SCORE_LABEL 0x0020
893 #define IPV6_SADDR_SCORE_PRIVACY 0x0040
894
895 static inline int ipv6_saddr_preferred(int type)
896 {
897 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
898 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
899 return 1;
900 return 0;
901 }
902
903 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
904 struct in6_addr *daddr, struct in6_addr *saddr)
905 {
906 struct ipv6_saddr_score hiscore;
907 struct inet6_ifaddr *ifa_result = NULL;
908 int daddr_type = __ipv6_addr_type(daddr);
909 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
910 int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
911 u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
912 struct net_device *dev;
913
914 memset(&hiscore, 0, sizeof(hiscore));
915
916 read_lock(&dev_base_lock);
917 rcu_read_lock();
918
919 for_each_netdev(&init_net, dev) {
920 struct inet6_dev *idev;
921 struct inet6_ifaddr *ifa;
922
923 /* Rule 0: Candidate Source Address (section 4)
924 * - multicast and link-local destination address,
925 * the set of candidate source address MUST only
926 * include addresses assigned to interfaces
927 * belonging to the same link as the outgoing
928 * interface.
929 * (- For site-local destination addresses, the
930 * set of candidate source addresses MUST only
931 * include addresses assigned to interfaces
932 * belonging to the same site as the outgoing
933 * interface.)
934 */
935 if ((daddr_type & IPV6_ADDR_MULTICAST ||
936 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
937 daddr_dev && dev != daddr_dev)
938 continue;
939
940 idev = __in6_dev_get(dev);
941 if (!idev)
942 continue;
943
944 read_lock_bh(&idev->lock);
945 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
946 struct ipv6_saddr_score score;
947
948 score.addr_type = __ipv6_addr_type(&ifa->addr);
949
950 /* Rule 0:
951 * - Tentative Address (RFC2462 section 5.4)
952 * - A tentative address is not considered
953 * "assigned to an interface" in the traditional
954 * sense, unless it is also flagged as optimistic.
955 * - Candidate Source Address (section 4)
956 * - In any case, anycast addresses, multicast
957 * addresses, and the unspecified address MUST
958 * NOT be included in a candidate set.
959 */
960 if ((ifa->flags & IFA_F_TENTATIVE) &&
961 (!(ifa->flags & IFA_F_OPTIMISTIC)))
962 continue;
963 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
964 score.addr_type & IPV6_ADDR_MULTICAST)) {
965 LIMIT_NETDEBUG(KERN_DEBUG
966 "ADDRCONF: unspecified / multicast address "
967 "assigned as unicast address on %s",
968 dev->name);
969 continue;
970 }
971
972 score.attrs = 0;
973 score.matchlen = 0;
974 score.scope = 0;
975 score.rule = 0;
976
977 if (ifa_result == NULL) {
978 /* record it if the first available entry */
979 goto record_it;
980 }
981
982 /* Rule 1: Prefer same address */
983 if (hiscore.rule < 1) {
984 if (ipv6_addr_equal(&ifa_result->addr, daddr))
985 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
986 hiscore.rule++;
987 }
988 if (ipv6_addr_equal(&ifa->addr, daddr)) {
989 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
990 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
991 score.rule = 1;
992 goto record_it;
993 }
994 } else {
995 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
996 continue;
997 }
998
999 /* Rule 2: Prefer appropriate scope */
1000 if (hiscore.rule < 2) {
1001 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1002 hiscore.rule++;
1003 }
1004 score.scope = __ipv6_addr_src_scope(score.addr_type);
1005 if (hiscore.scope < score.scope) {
1006 if (hiscore.scope < daddr_scope) {
1007 score.rule = 2;
1008 goto record_it;
1009 } else
1010 continue;
1011 } else if (score.scope < hiscore.scope) {
1012 if (score.scope < daddr_scope)
1013 break; /* addresses sorted by scope */
1014 else {
1015 score.rule = 2;
1016 goto record_it;
1017 }
1018 }
1019
1020 /* Rule 3: Avoid deprecated and optimistic addresses */
1021 if (hiscore.rule < 3) {
1022 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1023 (((ifa_result->flags &
1024 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1025 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1026 hiscore.rule++;
1027 }
1028 if (ipv6_saddr_preferred(score.addr_type) ||
1029 (((ifa->flags &
1030 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1031 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1032 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1033 score.rule = 3;
1034 goto record_it;
1035 }
1036 } else {
1037 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1038 continue;
1039 }
1040
1041 /* Rule 4: Prefer home address */
1042 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1043 if (hiscore.rule < 4) {
1044 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1045 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1046 hiscore.rule++;
1047 }
1048 if (ifa->flags & IFA_F_HOMEADDRESS) {
1049 score.attrs |= IPV6_SADDR_SCORE_HOA;
1050 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1051 score.rule = 4;
1052 goto record_it;
1053 }
1054 } else {
1055 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1056 continue;
1057 }
1058 #else
1059 if (hiscore.rule < 4)
1060 hiscore.rule++;
1061 #endif
1062
1063 /* Rule 5: Prefer outgoing interface */
1064 if (hiscore.rule < 5) {
1065 if (daddr_dev == NULL ||
1066 daddr_dev == ifa_result->idev->dev)
1067 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1068 hiscore.rule++;
1069 }
1070 if (daddr_dev == NULL ||
1071 daddr_dev == ifa->idev->dev) {
1072 score.attrs |= IPV6_SADDR_SCORE_OIF;
1073 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1074 score.rule = 5;
1075 goto record_it;
1076 }
1077 } else {
1078 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1079 continue;
1080 }
1081
1082 /* Rule 6: Prefer matching label */
1083 if (hiscore.rule < 6) {
1084 if (ipv6_addr_label(&ifa_result->addr,
1085 hiscore.addr_type,
1086 ifa_result->idev->dev->ifindex) == daddr_label)
1087 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1088 hiscore.rule++;
1089 }
1090 if (ipv6_addr_label(&ifa->addr,
1091 score.addr_type,
1092 ifa->idev->dev->ifindex) == daddr_label) {
1093 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1094 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1095 score.rule = 6;
1096 goto record_it;
1097 }
1098 } else {
1099 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1100 continue;
1101 }
1102
1103 #ifdef CONFIG_IPV6_PRIVACY
1104 /* Rule 7: Prefer public address
1105 * Note: prefer temprary address if use_tempaddr >= 2
1106 */
1107 if (hiscore.rule < 7) {
1108 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1109 (ifa_result->idev->cnf.use_tempaddr >= 2))
1110 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1111 hiscore.rule++;
1112 }
1113 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1114 (ifa->idev->cnf.use_tempaddr >= 2)) {
1115 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1116 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1117 score.rule = 7;
1118 goto record_it;
1119 }
1120 } else {
1121 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1122 continue;
1123 }
1124 #else
1125 if (hiscore.rule < 7)
1126 hiscore.rule++;
1127 #endif
1128
1129 /* Skip rule 8 for orchid -> non-orchid address pairs. */
1130 if (ipv6_addr_orchid(&ifa->addr) && !ipv6_addr_orchid(daddr))
1131 continue;
1132
1133 /* Rule 8: Use longest matching prefix */
1134 if (hiscore.rule < 8) {
1135 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1136 hiscore.rule++;
1137 }
1138 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1139 if (score.matchlen > hiscore.matchlen) {
1140 score.rule = 8;
1141 goto record_it;
1142 }
1143 #if 0
1144 else if (score.matchlen < hiscore.matchlen)
1145 continue;
1146 #endif
1147
1148 /* Final Rule: choose first available one */
1149 continue;
1150 record_it:
1151 if (ifa_result)
1152 in6_ifa_put(ifa_result);
1153 in6_ifa_hold(ifa);
1154 ifa_result = ifa;
1155 hiscore = score;
1156 }
1157 read_unlock_bh(&idev->lock);
1158 }
1159 rcu_read_unlock();
1160 read_unlock(&dev_base_lock);
1161
1162 if (!ifa_result)
1163 return -EADDRNOTAVAIL;
1164
1165 ipv6_addr_copy(saddr, &ifa_result->addr);
1166 in6_ifa_put(ifa_result);
1167 return 0;
1168 }
1169
1170 EXPORT_SYMBOL(ipv6_dev_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 net *net, struct in6_addr *addr,
1209 struct net_device *dev, int strict)
1210 {
1211 struct inet6_ifaddr * ifp;
1212 u8 hash = ipv6_addr_hash(addr);
1213
1214 read_lock_bh(&addrconf_hash_lock);
1215 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1216 if (ifp->idev->dev->nd_net != net)
1217 continue;
1218 if (ipv6_addr_equal(&ifp->addr, addr) &&
1219 !(ifp->flags&IFA_F_TENTATIVE)) {
1220 if (dev == NULL || ifp->idev->dev == dev ||
1221 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1222 break;
1223 }
1224 }
1225 read_unlock_bh(&addrconf_hash_lock);
1226 return ifp != NULL;
1227 }
1228 EXPORT_SYMBOL(ipv6_chk_addr);
1229
1230 static
1231 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1232 struct net_device *dev)
1233 {
1234 struct inet6_ifaddr * ifp;
1235 u8 hash = ipv6_addr_hash(addr);
1236
1237 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1238 if (ifp->idev->dev->nd_net != net)
1239 continue;
1240 if (ipv6_addr_equal(&ifp->addr, addr)) {
1241 if (dev == NULL || ifp->idev->dev == dev)
1242 break;
1243 }
1244 }
1245 return ifp != NULL;
1246 }
1247
1248 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1249 struct net_device *dev, int strict)
1250 {
1251 struct inet6_ifaddr * ifp;
1252 u8 hash = ipv6_addr_hash(addr);
1253
1254 read_lock_bh(&addrconf_hash_lock);
1255 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1256 if (ifp->idev->dev->nd_net != net)
1257 continue;
1258 if (ipv6_addr_equal(&ifp->addr, addr)) {
1259 if (dev == NULL || ifp->idev->dev == dev ||
1260 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1261 in6_ifa_hold(ifp);
1262 break;
1263 }
1264 }
1265 }
1266 read_unlock_bh(&addrconf_hash_lock);
1267
1268 return ifp;
1269 }
1270
1271 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1272 {
1273 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1274 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1275 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1276 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1277 int sk_ipv6only = ipv6_only_sock(sk);
1278 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1279 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1280 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1281
1282 if (!sk2_rcv_saddr && !sk_ipv6only)
1283 return 1;
1284
1285 if (addr_type2 == IPV6_ADDR_ANY &&
1286 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1287 return 1;
1288
1289 if (addr_type == IPV6_ADDR_ANY &&
1290 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1291 return 1;
1292
1293 if (sk2_rcv_saddr6 &&
1294 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1295 return 1;
1296
1297 if (addr_type == IPV6_ADDR_MAPPED &&
1298 !sk2_ipv6only &&
1299 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1300 return 1;
1301
1302 return 0;
1303 }
1304
1305 /* Gets referenced address, destroys ifaddr */
1306
1307 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1308 {
1309 if (ifp->flags&IFA_F_PERMANENT) {
1310 spin_lock_bh(&ifp->lock);
1311 addrconf_del_timer(ifp);
1312 ifp->flags |= IFA_F_TENTATIVE;
1313 spin_unlock_bh(&ifp->lock);
1314 in6_ifa_put(ifp);
1315 #ifdef CONFIG_IPV6_PRIVACY
1316 } else if (ifp->flags&IFA_F_TEMPORARY) {
1317 struct inet6_ifaddr *ifpub;
1318 spin_lock_bh(&ifp->lock);
1319 ifpub = ifp->ifpub;
1320 if (ifpub) {
1321 in6_ifa_hold(ifpub);
1322 spin_unlock_bh(&ifp->lock);
1323 ipv6_create_tempaddr(ifpub, ifp);
1324 in6_ifa_put(ifpub);
1325 } else {
1326 spin_unlock_bh(&ifp->lock);
1327 }
1328 ipv6_del_addr(ifp);
1329 #endif
1330 } else
1331 ipv6_del_addr(ifp);
1332 }
1333
1334 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1335 {
1336 if (net_ratelimit())
1337 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1338 addrconf_dad_stop(ifp);
1339 }
1340
1341 /* Join to solicited addr multicast group. */
1342
1343 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1344 {
1345 struct in6_addr maddr;
1346
1347 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1348 return;
1349
1350 addrconf_addr_solict_mult(addr, &maddr);
1351 ipv6_dev_mc_inc(dev, &maddr);
1352 }
1353
1354 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1355 {
1356 struct in6_addr maddr;
1357
1358 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1359 return;
1360
1361 addrconf_addr_solict_mult(addr, &maddr);
1362 __ipv6_dev_mc_dec(idev, &maddr);
1363 }
1364
1365 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1366 {
1367 struct in6_addr addr;
1368 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1369 if (ipv6_addr_any(&addr))
1370 return;
1371 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1372 }
1373
1374 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1375 {
1376 struct in6_addr addr;
1377 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1378 if (ipv6_addr_any(&addr))
1379 return;
1380 __ipv6_dev_ac_dec(ifp->idev, &addr);
1381 }
1382
1383 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1384 {
1385 if (dev->addr_len != ETH_ALEN)
1386 return -1;
1387 memcpy(eui, dev->dev_addr, 3);
1388 memcpy(eui + 5, dev->dev_addr + 3, 3);
1389
1390 /*
1391 * The zSeries OSA network cards can be shared among various
1392 * OS instances, but the OSA cards have only one MAC address.
1393 * This leads to duplicate address conflicts in conjunction
1394 * with IPv6 if more than one instance uses the same card.
1395 *
1396 * The driver for these cards can deliver a unique 16-bit
1397 * identifier for each instance sharing the same card. It is
1398 * placed instead of 0xFFFE in the interface identifier. The
1399 * "u" bit of the interface identifier is not inverted in this
1400 * case. Hence the resulting interface identifier has local
1401 * scope according to RFC2373.
1402 */
1403 if (dev->dev_id) {
1404 eui[3] = (dev->dev_id >> 8) & 0xFF;
1405 eui[4] = dev->dev_id & 0xFF;
1406 } else {
1407 eui[3] = 0xFF;
1408 eui[4] = 0xFE;
1409 eui[0] ^= 2;
1410 }
1411 return 0;
1412 }
1413
1414 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1415 {
1416 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1417 if (dev->addr_len != ARCNET_ALEN)
1418 return -1;
1419 memset(eui, 0, 7);
1420 eui[7] = *(u8*)dev->dev_addr;
1421 return 0;
1422 }
1423
1424 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1425 {
1426 if (dev->addr_len != INFINIBAND_ALEN)
1427 return -1;
1428 memcpy(eui, dev->dev_addr + 12, 8);
1429 eui[0] |= 2;
1430 return 0;
1431 }
1432
1433 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1434 {
1435 switch (dev->type) {
1436 case ARPHRD_ETHER:
1437 case ARPHRD_FDDI:
1438 case ARPHRD_IEEE802_TR:
1439 return addrconf_ifid_eui48(eui, dev);
1440 case ARPHRD_ARCNET:
1441 return addrconf_ifid_arcnet(eui, dev);
1442 case ARPHRD_INFINIBAND:
1443 return addrconf_ifid_infiniband(eui, dev);
1444 case ARPHRD_SIT:
1445 if (dev->priv_flags & IFF_ISATAP)
1446 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1447 }
1448 return -1;
1449 }
1450
1451 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1452 {
1453 int err = -1;
1454 struct inet6_ifaddr *ifp;
1455
1456 read_lock_bh(&idev->lock);
1457 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1458 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1459 memcpy(eui, ifp->addr.s6_addr+8, 8);
1460 err = 0;
1461 break;
1462 }
1463 }
1464 read_unlock_bh(&idev->lock);
1465 return err;
1466 }
1467
1468 #ifdef CONFIG_IPV6_PRIVACY
1469 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1470 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1471 {
1472 regen:
1473 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1474 idev->rndid[0] &= ~0x02;
1475
1476 /*
1477 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1478 * check if generated address is not inappropriate
1479 *
1480 * - Reserved subnet anycast (RFC 2526)
1481 * 11111101 11....11 1xxxxxxx
1482 * - ISATAP (RFC4214) 6.1
1483 * 00-00-5E-FE-xx-xx-xx-xx
1484 * - value 0
1485 * - XXX: already assigned to an address on the device
1486 */
1487 if (idev->rndid[0] == 0xfd &&
1488 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1489 (idev->rndid[7]&0x80))
1490 goto regen;
1491 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1492 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1493 goto regen;
1494 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1495 goto regen;
1496 }
1497
1498 return 0;
1499 }
1500
1501 static void ipv6_regen_rndid(unsigned long data)
1502 {
1503 struct inet6_dev *idev = (struct inet6_dev *) data;
1504 unsigned long expires;
1505
1506 rcu_read_lock_bh();
1507 write_lock_bh(&idev->lock);
1508
1509 if (idev->dead)
1510 goto out;
1511
1512 if (__ipv6_regen_rndid(idev) < 0)
1513 goto out;
1514
1515 expires = jiffies +
1516 idev->cnf.temp_prefered_lft * HZ -
1517 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1518 if (time_before(expires, jiffies)) {
1519 printk(KERN_WARNING
1520 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1521 idev->dev->name);
1522 goto out;
1523 }
1524
1525 if (!mod_timer(&idev->regen_timer, expires))
1526 in6_dev_hold(idev);
1527
1528 out:
1529 write_unlock_bh(&idev->lock);
1530 rcu_read_unlock_bh();
1531 in6_dev_put(idev);
1532 }
1533
1534 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1535 int ret = 0;
1536
1537 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1538 ret = __ipv6_regen_rndid(idev);
1539 return ret;
1540 }
1541 #endif
1542
1543 /*
1544 * Add prefix route.
1545 */
1546
1547 static void
1548 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1549 unsigned long expires, u32 flags)
1550 {
1551 struct fib6_config cfg = {
1552 .fc_table = RT6_TABLE_PREFIX,
1553 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1554 .fc_ifindex = dev->ifindex,
1555 .fc_expires = expires,
1556 .fc_dst_len = plen,
1557 .fc_flags = RTF_UP | flags,
1558 .fc_nlinfo.nl_net = &init_net,
1559 };
1560
1561 ipv6_addr_copy(&cfg.fc_dst, pfx);
1562
1563 /* Prevent useless cloning on PtP SIT.
1564 This thing is done here expecting that the whole
1565 class of non-broadcast devices need not cloning.
1566 */
1567 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1568 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1569 cfg.fc_flags |= RTF_NONEXTHOP;
1570 #endif
1571
1572 ip6_route_add(&cfg);
1573 }
1574
1575 /* Create "default" multicast route to the interface */
1576
1577 static void addrconf_add_mroute(struct net_device *dev)
1578 {
1579 struct fib6_config cfg = {
1580 .fc_table = RT6_TABLE_LOCAL,
1581 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1582 .fc_ifindex = dev->ifindex,
1583 .fc_dst_len = 8,
1584 .fc_flags = RTF_UP,
1585 .fc_nlinfo.nl_net = &init_net,
1586 };
1587
1588 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1589
1590 ip6_route_add(&cfg);
1591 }
1592
1593 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1594 static void sit_route_add(struct net_device *dev)
1595 {
1596 struct fib6_config cfg = {
1597 .fc_table = RT6_TABLE_MAIN,
1598 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1599 .fc_ifindex = dev->ifindex,
1600 .fc_dst_len = 96,
1601 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1602 .fc_nlinfo.nl_net = &init_net,
1603 };
1604
1605 /* prefix length - 96 bits "::d.d.d.d" */
1606 ip6_route_add(&cfg);
1607 }
1608 #endif
1609
1610 static void addrconf_add_lroute(struct net_device *dev)
1611 {
1612 struct in6_addr addr;
1613
1614 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1615 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1616 }
1617
1618 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1619 {
1620 struct inet6_dev *idev;
1621
1622 ASSERT_RTNL();
1623
1624 if ((idev = ipv6_find_idev(dev)) == NULL)
1625 return NULL;
1626
1627 /* Add default multicast route */
1628 addrconf_add_mroute(dev);
1629
1630 /* Add link local route */
1631 addrconf_add_lroute(dev);
1632 return idev;
1633 }
1634
1635 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1636 {
1637 struct prefix_info *pinfo;
1638 __u32 valid_lft;
1639 __u32 prefered_lft;
1640 int addr_type;
1641 unsigned long rt_expires;
1642 struct inet6_dev *in6_dev;
1643
1644 pinfo = (struct prefix_info *) opt;
1645
1646 if (len < sizeof(struct prefix_info)) {
1647 ADBG(("addrconf: prefix option too short\n"));
1648 return;
1649 }
1650
1651 /*
1652 * Validation checks ([ADDRCONF], page 19)
1653 */
1654
1655 addr_type = ipv6_addr_type(&pinfo->prefix);
1656
1657 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1658 return;
1659
1660 valid_lft = ntohl(pinfo->valid);
1661 prefered_lft = ntohl(pinfo->prefered);
1662
1663 if (prefered_lft > valid_lft) {
1664 if (net_ratelimit())
1665 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1666 return;
1667 }
1668
1669 in6_dev = in6_dev_get(dev);
1670
1671 if (in6_dev == NULL) {
1672 if (net_ratelimit())
1673 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1674 return;
1675 }
1676
1677 /*
1678 * Two things going on here:
1679 * 1) Add routes for on-link prefixes
1680 * 2) Configure prefixes with the auto flag set
1681 */
1682
1683 /* Avoid arithmetic overflow. Really, we could
1684 save rt_expires in seconds, likely valid_lft,
1685 but it would require division in fib gc, that it
1686 not good.
1687 */
1688 if (valid_lft >= 0x7FFFFFFF/HZ)
1689 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1690 else
1691 rt_expires = valid_lft * HZ;
1692
1693 /*
1694 * We convert this (in jiffies) to clock_t later.
1695 * Avoid arithmetic overflow there as well.
1696 * Overflow can happen only if HZ < USER_HZ.
1697 */
1698 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1699 rt_expires = 0x7FFFFFFF / USER_HZ;
1700
1701 if (pinfo->onlink) {
1702 struct rt6_info *rt;
1703 rt = rt6_lookup(&init_net, &pinfo->prefix, NULL, dev->ifindex, 1);
1704
1705 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1706 if (rt->rt6i_flags&RTF_EXPIRES) {
1707 if (valid_lft == 0) {
1708 ip6_del_rt(rt);
1709 rt = NULL;
1710 } else {
1711 rt->rt6i_expires = jiffies + rt_expires;
1712 }
1713 }
1714 } else if (valid_lft) {
1715 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1716 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1717 }
1718 if (rt)
1719 dst_release(&rt->u.dst);
1720 }
1721
1722 /* Try to figure out our local address for this prefix */
1723
1724 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1725 struct inet6_ifaddr * ifp;
1726 struct in6_addr addr;
1727 int create = 0, update_lft = 0;
1728
1729 if (pinfo->prefix_len == 64) {
1730 memcpy(&addr, &pinfo->prefix, 8);
1731 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1732 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1733 in6_dev_put(in6_dev);
1734 return;
1735 }
1736 goto ok;
1737 }
1738 if (net_ratelimit())
1739 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1740 pinfo->prefix_len);
1741 in6_dev_put(in6_dev);
1742 return;
1743
1744 ok:
1745
1746 ifp = ipv6_get_ifaddr(&init_net, &addr, dev, 1);
1747
1748 if (ifp == NULL && valid_lft) {
1749 int max_addresses = in6_dev->cnf.max_addresses;
1750 u32 addr_flags = 0;
1751
1752 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1753 if (in6_dev->cnf.optimistic_dad &&
1754 !ipv6_devconf.forwarding)
1755 addr_flags = IFA_F_OPTIMISTIC;
1756 #endif
1757
1758 /* Do not allow to create too much of autoconfigured
1759 * addresses; this would be too easy way to crash kernel.
1760 */
1761 if (!max_addresses ||
1762 ipv6_count_addresses(in6_dev) < max_addresses)
1763 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1764 addr_type&IPV6_ADDR_SCOPE_MASK,
1765 addr_flags);
1766
1767 if (!ifp || IS_ERR(ifp)) {
1768 in6_dev_put(in6_dev);
1769 return;
1770 }
1771
1772 update_lft = create = 1;
1773 ifp->cstamp = jiffies;
1774 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1775 }
1776
1777 if (ifp) {
1778 int flags;
1779 unsigned long now;
1780 #ifdef CONFIG_IPV6_PRIVACY
1781 struct inet6_ifaddr *ift;
1782 #endif
1783 u32 stored_lft;
1784
1785 /* update lifetime (RFC2462 5.5.3 e) */
1786 spin_lock(&ifp->lock);
1787 now = jiffies;
1788 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1789 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1790 else
1791 stored_lft = 0;
1792 if (!update_lft && stored_lft) {
1793 if (valid_lft > MIN_VALID_LIFETIME ||
1794 valid_lft > stored_lft)
1795 update_lft = 1;
1796 else if (stored_lft <= MIN_VALID_LIFETIME) {
1797 /* valid_lft <= stored_lft is always true */
1798 /* XXX: IPsec */
1799 update_lft = 0;
1800 } else {
1801 valid_lft = MIN_VALID_LIFETIME;
1802 if (valid_lft < prefered_lft)
1803 prefered_lft = valid_lft;
1804 update_lft = 1;
1805 }
1806 }
1807
1808 if (update_lft) {
1809 ifp->valid_lft = valid_lft;
1810 ifp->prefered_lft = prefered_lft;
1811 ifp->tstamp = now;
1812 flags = ifp->flags;
1813 ifp->flags &= ~IFA_F_DEPRECATED;
1814 spin_unlock(&ifp->lock);
1815
1816 if (!(flags&IFA_F_TENTATIVE))
1817 ipv6_ifa_notify(0, ifp);
1818 } else
1819 spin_unlock(&ifp->lock);
1820
1821 #ifdef CONFIG_IPV6_PRIVACY
1822 read_lock_bh(&in6_dev->lock);
1823 /* update all temporary addresses in the list */
1824 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1825 /*
1826 * When adjusting the lifetimes of an existing
1827 * temporary address, only lower the lifetimes.
1828 * Implementations must not increase the
1829 * lifetimes of an existing temporary address
1830 * when processing a Prefix Information Option.
1831 */
1832 spin_lock(&ift->lock);
1833 flags = ift->flags;
1834 if (ift->valid_lft > valid_lft &&
1835 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1836 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1837 if (ift->prefered_lft > prefered_lft &&
1838 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1839 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1840 spin_unlock(&ift->lock);
1841 if (!(flags&IFA_F_TENTATIVE))
1842 ipv6_ifa_notify(0, ift);
1843 }
1844
1845 if (create && in6_dev->cnf.use_tempaddr > 0) {
1846 /*
1847 * When a new public address is created as described in [ADDRCONF],
1848 * also create a new temporary address.
1849 */
1850 read_unlock_bh(&in6_dev->lock);
1851 ipv6_create_tempaddr(ifp, NULL);
1852 } else {
1853 read_unlock_bh(&in6_dev->lock);
1854 }
1855 #endif
1856 in6_ifa_put(ifp);
1857 addrconf_verify(0);
1858 }
1859 }
1860 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1861 in6_dev_put(in6_dev);
1862 }
1863
1864 /*
1865 * Set destination address.
1866 * Special case for SIT interfaces where we create a new "virtual"
1867 * device.
1868 */
1869 int addrconf_set_dstaddr(void __user *arg)
1870 {
1871 struct in6_ifreq ireq;
1872 struct net_device *dev;
1873 int err = -EINVAL;
1874
1875 rtnl_lock();
1876
1877 err = -EFAULT;
1878 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1879 goto err_exit;
1880
1881 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1882
1883 err = -ENODEV;
1884 if (dev == NULL)
1885 goto err_exit;
1886
1887 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1888 if (dev->type == ARPHRD_SIT) {
1889 struct ifreq ifr;
1890 mm_segment_t oldfs;
1891 struct ip_tunnel_parm p;
1892
1893 err = -EADDRNOTAVAIL;
1894 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1895 goto err_exit;
1896
1897 memset(&p, 0, sizeof(p));
1898 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1899 p.iph.saddr = 0;
1900 p.iph.version = 4;
1901 p.iph.ihl = 5;
1902 p.iph.protocol = IPPROTO_IPV6;
1903 p.iph.ttl = 64;
1904 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1905
1906 oldfs = get_fs(); set_fs(KERNEL_DS);
1907 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1908 set_fs(oldfs);
1909
1910 if (err == 0) {
1911 err = -ENOBUFS;
1912 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1913 goto err_exit;
1914 err = dev_open(dev);
1915 }
1916 }
1917 #endif
1918
1919 err_exit:
1920 rtnl_unlock();
1921 return err;
1922 }
1923
1924 /*
1925 * Manual configuration of address on an interface
1926 */
1927 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1928 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1929 {
1930 struct inet6_ifaddr *ifp;
1931 struct inet6_dev *idev;
1932 struct net_device *dev;
1933 int scope;
1934 u32 flags = RTF_EXPIRES;
1935
1936 ASSERT_RTNL();
1937
1938 /* check the lifetime */
1939 if (!valid_lft || prefered_lft > valid_lft)
1940 return -EINVAL;
1941
1942 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1943 return -ENODEV;
1944
1945 if ((idev = addrconf_add_dev(dev)) == NULL)
1946 return -ENOBUFS;
1947
1948 scope = ipv6_addr_scope(pfx);
1949
1950 if (valid_lft == INFINITY_LIFE_TIME) {
1951 ifa_flags |= IFA_F_PERMANENT;
1952 flags = 0;
1953 } else if (valid_lft >= 0x7FFFFFFF/HZ)
1954 valid_lft = 0x7FFFFFFF/HZ;
1955
1956 if (prefered_lft == 0)
1957 ifa_flags |= IFA_F_DEPRECATED;
1958 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1959 (prefered_lft != INFINITY_LIFE_TIME))
1960 prefered_lft = 0x7FFFFFFF/HZ;
1961
1962 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1963
1964 if (!IS_ERR(ifp)) {
1965 spin_lock_bh(&ifp->lock);
1966 ifp->valid_lft = valid_lft;
1967 ifp->prefered_lft = prefered_lft;
1968 ifp->tstamp = jiffies;
1969 spin_unlock_bh(&ifp->lock);
1970
1971 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1972 jiffies_to_clock_t(valid_lft * HZ), flags);
1973 /*
1974 * Note that section 3.1 of RFC 4429 indicates
1975 * that the Optimistic flag should not be set for
1976 * manually configured addresses
1977 */
1978 addrconf_dad_start(ifp, 0);
1979 in6_ifa_put(ifp);
1980 addrconf_verify(0);
1981 return 0;
1982 }
1983
1984 return PTR_ERR(ifp);
1985 }
1986
1987 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1988 {
1989 struct inet6_ifaddr *ifp;
1990 struct inet6_dev *idev;
1991 struct net_device *dev;
1992
1993 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1994 return -ENODEV;
1995
1996 if ((idev = __in6_dev_get(dev)) == NULL)
1997 return -ENXIO;
1998
1999 read_lock_bh(&idev->lock);
2000 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2001 if (ifp->prefix_len == plen &&
2002 ipv6_addr_equal(pfx, &ifp->addr)) {
2003 in6_ifa_hold(ifp);
2004 read_unlock_bh(&idev->lock);
2005
2006 ipv6_del_addr(ifp);
2007
2008 /* If the last address is deleted administratively,
2009 disable IPv6 on this interface.
2010 */
2011 if (idev->addr_list == NULL)
2012 addrconf_ifdown(idev->dev, 1);
2013 return 0;
2014 }
2015 }
2016 read_unlock_bh(&idev->lock);
2017 return -EADDRNOTAVAIL;
2018 }
2019
2020
2021 int addrconf_add_ifaddr(void __user *arg)
2022 {
2023 struct in6_ifreq ireq;
2024 int err;
2025
2026 if (!capable(CAP_NET_ADMIN))
2027 return -EPERM;
2028
2029 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2030 return -EFAULT;
2031
2032 rtnl_lock();
2033 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2034 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2035 rtnl_unlock();
2036 return err;
2037 }
2038
2039 int addrconf_del_ifaddr(void __user *arg)
2040 {
2041 struct in6_ifreq ireq;
2042 int err;
2043
2044 if (!capable(CAP_NET_ADMIN))
2045 return -EPERM;
2046
2047 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2048 return -EFAULT;
2049
2050 rtnl_lock();
2051 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2052 rtnl_unlock();
2053 return err;
2054 }
2055
2056 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2057 static void sit_add_v4_addrs(struct inet6_dev *idev)
2058 {
2059 struct inet6_ifaddr * ifp;
2060 struct in6_addr addr;
2061 struct net_device *dev;
2062 int scope;
2063
2064 ASSERT_RTNL();
2065
2066 memset(&addr, 0, sizeof(struct in6_addr));
2067 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2068
2069 if (idev->dev->flags&IFF_POINTOPOINT) {
2070 addr.s6_addr32[0] = htonl(0xfe800000);
2071 scope = IFA_LINK;
2072 } else {
2073 scope = IPV6_ADDR_COMPATv4;
2074 }
2075
2076 if (addr.s6_addr32[3]) {
2077 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2078 if (!IS_ERR(ifp)) {
2079 spin_lock_bh(&ifp->lock);
2080 ifp->flags &= ~IFA_F_TENTATIVE;
2081 spin_unlock_bh(&ifp->lock);
2082 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2083 in6_ifa_put(ifp);
2084 }
2085 return;
2086 }
2087
2088 for_each_netdev(&init_net, dev) {
2089 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2090 if (in_dev && (dev->flags & IFF_UP)) {
2091 struct in_ifaddr * ifa;
2092
2093 int flag = scope;
2094
2095 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2096 int plen;
2097
2098 addr.s6_addr32[3] = ifa->ifa_local;
2099
2100 if (ifa->ifa_scope == RT_SCOPE_LINK)
2101 continue;
2102 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2103 if (idev->dev->flags&IFF_POINTOPOINT)
2104 continue;
2105 flag |= IFA_HOST;
2106 }
2107 if (idev->dev->flags&IFF_POINTOPOINT)
2108 plen = 64;
2109 else
2110 plen = 96;
2111
2112 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2113 IFA_F_PERMANENT);
2114 if (!IS_ERR(ifp)) {
2115 spin_lock_bh(&ifp->lock);
2116 ifp->flags &= ~IFA_F_TENTATIVE;
2117 spin_unlock_bh(&ifp->lock);
2118 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2119 in6_ifa_put(ifp);
2120 }
2121 }
2122 }
2123 }
2124 }
2125 #endif
2126
2127 static void init_loopback(struct net_device *dev)
2128 {
2129 struct inet6_dev *idev;
2130 struct inet6_ifaddr * ifp;
2131
2132 /* ::1 */
2133
2134 ASSERT_RTNL();
2135
2136 if ((idev = ipv6_find_idev(dev)) == NULL) {
2137 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2138 return;
2139 }
2140
2141 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2142 if (!IS_ERR(ifp)) {
2143 spin_lock_bh(&ifp->lock);
2144 ifp->flags &= ~IFA_F_TENTATIVE;
2145 spin_unlock_bh(&ifp->lock);
2146 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2147 in6_ifa_put(ifp);
2148 }
2149 }
2150
2151 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2152 {
2153 struct inet6_ifaddr * ifp;
2154 u32 addr_flags = IFA_F_PERMANENT;
2155
2156 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2157 if (idev->cnf.optimistic_dad &&
2158 !ipv6_devconf.forwarding)
2159 addr_flags |= IFA_F_OPTIMISTIC;
2160 #endif
2161
2162
2163 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2164 if (!IS_ERR(ifp)) {
2165 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2166 addrconf_dad_start(ifp, 0);
2167 in6_ifa_put(ifp);
2168 }
2169 }
2170
2171 static void addrconf_dev_config(struct net_device *dev)
2172 {
2173 struct in6_addr addr;
2174 struct inet6_dev * idev;
2175
2176 ASSERT_RTNL();
2177
2178 if ((dev->type != ARPHRD_ETHER) &&
2179 (dev->type != ARPHRD_FDDI) &&
2180 (dev->type != ARPHRD_IEEE802_TR) &&
2181 (dev->type != ARPHRD_ARCNET) &&
2182 (dev->type != ARPHRD_INFINIBAND)) {
2183 /* Alas, we support only Ethernet autoconfiguration. */
2184 return;
2185 }
2186
2187 idev = addrconf_add_dev(dev);
2188 if (idev == NULL)
2189 return;
2190
2191 memset(&addr, 0, sizeof(struct in6_addr));
2192 addr.s6_addr32[0] = htonl(0xFE800000);
2193
2194 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2195 addrconf_add_linklocal(idev, &addr);
2196 }
2197
2198 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2199 static void addrconf_sit_config(struct net_device *dev)
2200 {
2201 struct inet6_dev *idev;
2202
2203 ASSERT_RTNL();
2204
2205 /*
2206 * Configure the tunnel with one of our IPv4
2207 * addresses... we should configure all of
2208 * our v4 addrs in the tunnel
2209 */
2210
2211 if ((idev = ipv6_find_idev(dev)) == NULL) {
2212 printk(KERN_DEBUG "init sit: add_dev failed\n");
2213 return;
2214 }
2215
2216 if (dev->priv_flags & IFF_ISATAP) {
2217 struct in6_addr addr;
2218
2219 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2220 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2221 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2222 addrconf_add_linklocal(idev, &addr);
2223 return;
2224 }
2225
2226 sit_add_v4_addrs(idev);
2227
2228 if (dev->flags&IFF_POINTOPOINT) {
2229 addrconf_add_mroute(dev);
2230 addrconf_add_lroute(dev);
2231 } else
2232 sit_route_add(dev);
2233 }
2234 #endif
2235
2236 static inline int
2237 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2238 {
2239 struct in6_addr lladdr;
2240
2241 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2242 addrconf_add_linklocal(idev, &lladdr);
2243 return 0;
2244 }
2245 return -1;
2246 }
2247
2248 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2249 {
2250 struct net_device *link_dev;
2251
2252 /* first try to inherit the link-local address from the link device */
2253 if (idev->dev->iflink &&
2254 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2255 if (!ipv6_inherit_linklocal(idev, link_dev))
2256 return;
2257 }
2258 /* then try to inherit it from any device */
2259 for_each_netdev(&init_net, link_dev) {
2260 if (!ipv6_inherit_linklocal(idev, link_dev))
2261 return;
2262 }
2263 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2264 }
2265
2266 /*
2267 * Autoconfigure tunnel with a link-local address so routing protocols,
2268 * DHCPv6, MLD etc. can be run over the virtual link
2269 */
2270
2271 static void addrconf_ip6_tnl_config(struct net_device *dev)
2272 {
2273 struct inet6_dev *idev;
2274
2275 ASSERT_RTNL();
2276
2277 if ((idev = addrconf_add_dev(dev)) == NULL) {
2278 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2279 return;
2280 }
2281 ip6_tnl_add_linklocal(idev);
2282 }
2283
2284 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2285 void * data)
2286 {
2287 struct net_device *dev = (struct net_device *) data;
2288 struct inet6_dev *idev = __in6_dev_get(dev);
2289 int run_pending = 0;
2290 int err;
2291
2292 if (dev->nd_net != &init_net)
2293 return NOTIFY_DONE;
2294
2295 switch(event) {
2296 case NETDEV_REGISTER:
2297 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2298 idev = ipv6_add_dev(dev);
2299 if (!idev)
2300 return notifier_from_errno(-ENOMEM);
2301 }
2302 break;
2303 case NETDEV_UP:
2304 case NETDEV_CHANGE:
2305 if (dev->flags & IFF_SLAVE)
2306 break;
2307
2308 if (event == NETDEV_UP) {
2309 if (!addrconf_qdisc_ok(dev)) {
2310 /* device is not ready yet. */
2311 printk(KERN_INFO
2312 "ADDRCONF(NETDEV_UP): %s: "
2313 "link is not ready\n",
2314 dev->name);
2315 break;
2316 }
2317
2318 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2319 idev = ipv6_add_dev(dev);
2320
2321 if (idev)
2322 idev->if_flags |= IF_READY;
2323 } else {
2324 if (!addrconf_qdisc_ok(dev)) {
2325 /* device is still not ready. */
2326 break;
2327 }
2328
2329 if (idev) {
2330 if (idev->if_flags & IF_READY) {
2331 /* device is already configured. */
2332 break;
2333 }
2334 idev->if_flags |= IF_READY;
2335 }
2336
2337 printk(KERN_INFO
2338 "ADDRCONF(NETDEV_CHANGE): %s: "
2339 "link becomes ready\n",
2340 dev->name);
2341
2342 run_pending = 1;
2343 }
2344
2345 switch(dev->type) {
2346 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2347 case ARPHRD_SIT:
2348 addrconf_sit_config(dev);
2349 break;
2350 #endif
2351 case ARPHRD_TUNNEL6:
2352 addrconf_ip6_tnl_config(dev);
2353 break;
2354 case ARPHRD_LOOPBACK:
2355 init_loopback(dev);
2356 break;
2357
2358 default:
2359 addrconf_dev_config(dev);
2360 break;
2361 }
2362 if (idev) {
2363 if (run_pending)
2364 addrconf_dad_run(idev);
2365
2366 /* If the MTU changed during the interface down, when the
2367 interface up, the changed MTU must be reflected in the
2368 idev as well as routers.
2369 */
2370 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2371 rt6_mtu_change(dev, dev->mtu);
2372 idev->cnf.mtu6 = dev->mtu;
2373 }
2374 idev->tstamp = jiffies;
2375 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2376 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2377 stop IPv6 on this interface.
2378 */
2379 if (dev->mtu < IPV6_MIN_MTU)
2380 addrconf_ifdown(dev, event != NETDEV_DOWN);
2381 }
2382 break;
2383
2384 case NETDEV_CHANGEMTU:
2385 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2386 rt6_mtu_change(dev, dev->mtu);
2387 idev->cnf.mtu6 = dev->mtu;
2388 break;
2389 }
2390
2391 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2392 idev = ipv6_add_dev(dev);
2393 if (idev)
2394 break;
2395 }
2396
2397 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2398
2399 case NETDEV_DOWN:
2400 case NETDEV_UNREGISTER:
2401 /*
2402 * Remove all addresses from this interface.
2403 */
2404 addrconf_ifdown(dev, event != NETDEV_DOWN);
2405 break;
2406
2407 case NETDEV_CHANGENAME:
2408 if (idev) {
2409 snmp6_unregister_dev(idev);
2410 addrconf_sysctl_unregister(idev);
2411 addrconf_sysctl_register(idev);
2412 err = snmp6_register_dev(idev);
2413 if (err)
2414 return notifier_from_errno(err);
2415 }
2416 break;
2417 }
2418
2419 return NOTIFY_OK;
2420 }
2421
2422 /*
2423 * addrconf module should be notified of a device going up
2424 */
2425 static struct notifier_block ipv6_dev_notf = {
2426 .notifier_call = addrconf_notify,
2427 .priority = 0
2428 };
2429
2430 static int addrconf_ifdown(struct net_device *dev, int how)
2431 {
2432 struct inet6_dev *idev;
2433 struct inet6_ifaddr *ifa, **bifa;
2434 struct net *net = dev->nd_net;
2435 int i;
2436
2437 ASSERT_RTNL();
2438
2439 if (dev == init_net.loopback_dev && how == 1)
2440 how = 0;
2441
2442 rt6_ifdown(net, dev);
2443 neigh_ifdown(&nd_tbl, dev);
2444
2445 idev = __in6_dev_get(dev);
2446 if (idev == NULL)
2447 return -ENODEV;
2448
2449 /* Step 1: remove reference to ipv6 device from parent device.
2450 Do not dev_put!
2451 */
2452 if (how == 1) {
2453 idev->dead = 1;
2454
2455 /* protected by rtnl_lock */
2456 rcu_assign_pointer(dev->ip6_ptr, NULL);
2457
2458 /* Step 1.5: remove snmp6 entry */
2459 snmp6_unregister_dev(idev);
2460
2461 }
2462
2463 /* Step 2: clear hash table */
2464 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2465 bifa = &inet6_addr_lst[i];
2466
2467 write_lock_bh(&addrconf_hash_lock);
2468 while ((ifa = *bifa) != NULL) {
2469 if (ifa->idev == idev) {
2470 *bifa = ifa->lst_next;
2471 ifa->lst_next = NULL;
2472 addrconf_del_timer(ifa);
2473 in6_ifa_put(ifa);
2474 continue;
2475 }
2476 bifa = &ifa->lst_next;
2477 }
2478 write_unlock_bh(&addrconf_hash_lock);
2479 }
2480
2481 write_lock_bh(&idev->lock);
2482
2483 /* Step 3: clear flags for stateless addrconf */
2484 if (how != 1)
2485 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2486
2487 /* Step 4: clear address list */
2488 #ifdef CONFIG_IPV6_PRIVACY
2489 if (how == 1 && del_timer(&idev->regen_timer))
2490 in6_dev_put(idev);
2491
2492 /* clear tempaddr list */
2493 while ((ifa = idev->tempaddr_list) != NULL) {
2494 idev->tempaddr_list = ifa->tmp_next;
2495 ifa->tmp_next = NULL;
2496 ifa->dead = 1;
2497 write_unlock_bh(&idev->lock);
2498 spin_lock_bh(&ifa->lock);
2499
2500 if (ifa->ifpub) {
2501 in6_ifa_put(ifa->ifpub);
2502 ifa->ifpub = NULL;
2503 }
2504 spin_unlock_bh(&ifa->lock);
2505 in6_ifa_put(ifa);
2506 write_lock_bh(&idev->lock);
2507 }
2508 #endif
2509 while ((ifa = idev->addr_list) != NULL) {
2510 idev->addr_list = ifa->if_next;
2511 ifa->if_next = NULL;
2512 ifa->dead = 1;
2513 addrconf_del_timer(ifa);
2514 write_unlock_bh(&idev->lock);
2515
2516 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2517 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2518 in6_ifa_put(ifa);
2519
2520 write_lock_bh(&idev->lock);
2521 }
2522 write_unlock_bh(&idev->lock);
2523
2524 /* Step 5: Discard multicast list */
2525
2526 if (how == 1)
2527 ipv6_mc_destroy_dev(idev);
2528 else
2529 ipv6_mc_down(idev);
2530
2531 idev->tstamp = jiffies;
2532
2533 /* Shot the device (if unregistered) */
2534
2535 if (how == 1) {
2536 addrconf_sysctl_unregister(idev);
2537 neigh_parms_release(&nd_tbl, idev->nd_parms);
2538 neigh_ifdown(&nd_tbl, dev);
2539 in6_dev_put(idev);
2540 }
2541 return 0;
2542 }
2543
2544 static void addrconf_rs_timer(unsigned long data)
2545 {
2546 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2547
2548 if (ifp->idev->cnf.forwarding)
2549 goto out;
2550
2551 if (ifp->idev->if_flags & IF_RA_RCVD) {
2552 /*
2553 * Announcement received after solicitation
2554 * was sent
2555 */
2556 goto out;
2557 }
2558
2559 spin_lock(&ifp->lock);
2560 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2561 struct in6_addr all_routers;
2562
2563 /* The wait after the last probe can be shorter */
2564 addrconf_mod_timer(ifp, AC_RS,
2565 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2566 ifp->idev->cnf.rtr_solicit_delay :
2567 ifp->idev->cnf.rtr_solicit_interval);
2568 spin_unlock(&ifp->lock);
2569
2570 ipv6_addr_all_routers(&all_routers);
2571
2572 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2573 } else {
2574 spin_unlock(&ifp->lock);
2575 /*
2576 * Note: we do not support deprecated "all on-link"
2577 * assumption any longer.
2578 */
2579 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2580 ifp->idev->dev->name);
2581 }
2582
2583 out:
2584 in6_ifa_put(ifp);
2585 }
2586
2587 /*
2588 * Duplicate Address Detection
2589 */
2590 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2591 {
2592 unsigned long rand_num;
2593 struct inet6_dev *idev = ifp->idev;
2594
2595 if (ifp->flags & IFA_F_OPTIMISTIC)
2596 rand_num = 0;
2597 else
2598 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2599
2600 ifp->probes = idev->cnf.dad_transmits;
2601 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2602 }
2603
2604 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2605 {
2606 struct inet6_dev *idev = ifp->idev;
2607 struct net_device *dev = idev->dev;
2608
2609 addrconf_join_solict(dev, &ifp->addr);
2610
2611 net_srandom(ifp->addr.s6_addr32[3]);
2612
2613 read_lock_bh(&idev->lock);
2614 if (ifp->dead)
2615 goto out;
2616 spin_lock_bh(&ifp->lock);
2617
2618 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2619 !(ifp->flags&IFA_F_TENTATIVE) ||
2620 ifp->flags & IFA_F_NODAD) {
2621 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2622 spin_unlock_bh(&ifp->lock);
2623 read_unlock_bh(&idev->lock);
2624
2625 addrconf_dad_completed(ifp);
2626 return;
2627 }
2628
2629 if (!(idev->if_flags & IF_READY)) {
2630 spin_unlock_bh(&ifp->lock);
2631 read_unlock_bh(&idev->lock);
2632 /*
2633 * If the defice is not ready:
2634 * - keep it tentative if it is a permanent address.
2635 * - otherwise, kill it.
2636 */
2637 in6_ifa_hold(ifp);
2638 addrconf_dad_stop(ifp);
2639 return;
2640 }
2641
2642 /*
2643 * Optimistic nodes can start receiving
2644 * Frames right away
2645 */
2646 if(ifp->flags & IFA_F_OPTIMISTIC)
2647 ip6_ins_rt(ifp->rt);
2648
2649 addrconf_dad_kick(ifp);
2650 spin_unlock_bh(&ifp->lock);
2651 out:
2652 read_unlock_bh(&idev->lock);
2653 }
2654
2655 static void addrconf_dad_timer(unsigned long data)
2656 {
2657 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2658 struct inet6_dev *idev = ifp->idev;
2659 struct in6_addr unspec;
2660 struct in6_addr mcaddr;
2661
2662 read_lock_bh(&idev->lock);
2663 if (idev->dead) {
2664 read_unlock_bh(&idev->lock);
2665 goto out;
2666 }
2667 spin_lock_bh(&ifp->lock);
2668 if (ifp->probes == 0) {
2669 /*
2670 * DAD was successful
2671 */
2672
2673 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2674 spin_unlock_bh(&ifp->lock);
2675 read_unlock_bh(&idev->lock);
2676
2677 addrconf_dad_completed(ifp);
2678
2679 goto out;
2680 }
2681
2682 ifp->probes--;
2683 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2684 spin_unlock_bh(&ifp->lock);
2685 read_unlock_bh(&idev->lock);
2686
2687 /* send a neighbour solicitation for our addr */
2688 memset(&unspec, 0, sizeof(unspec));
2689 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2690 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2691 out:
2692 in6_ifa_put(ifp);
2693 }
2694
2695 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2696 {
2697 struct net_device * dev = ifp->idev->dev;
2698
2699 /*
2700 * Configure the address for reception. Now it is valid.
2701 */
2702
2703 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2704
2705 /* If added prefix is link local and forwarding is off,
2706 start sending router solicitations.
2707 */
2708
2709 if (ifp->idev->cnf.forwarding == 0 &&
2710 ifp->idev->cnf.rtr_solicits > 0 &&
2711 (dev->flags&IFF_LOOPBACK) == 0 &&
2712 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2713 struct in6_addr all_routers;
2714
2715 ipv6_addr_all_routers(&all_routers);
2716
2717 /*
2718 * If a host as already performed a random delay
2719 * [...] as part of DAD [...] there is no need
2720 * to delay again before sending the first RS
2721 */
2722 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2723
2724 spin_lock_bh(&ifp->lock);
2725 ifp->probes = 1;
2726 ifp->idev->if_flags |= IF_RS_SENT;
2727 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2728 spin_unlock_bh(&ifp->lock);
2729 }
2730 }
2731
2732 static void addrconf_dad_run(struct inet6_dev *idev) {
2733 struct inet6_ifaddr *ifp;
2734
2735 read_lock_bh(&idev->lock);
2736 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2737 spin_lock_bh(&ifp->lock);
2738 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2739 spin_unlock_bh(&ifp->lock);
2740 continue;
2741 }
2742 spin_unlock_bh(&ifp->lock);
2743 addrconf_dad_kick(ifp);
2744 }
2745 read_unlock_bh(&idev->lock);
2746 }
2747
2748 #ifdef CONFIG_PROC_FS
2749 struct if6_iter_state {
2750 struct seq_net_private p;
2751 int bucket;
2752 };
2753
2754 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2755 {
2756 struct inet6_ifaddr *ifa = NULL;
2757 struct if6_iter_state *state = seq->private;
2758 struct net *net = state->p.net;
2759
2760 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2761 ifa = inet6_addr_lst[state->bucket];
2762
2763 while (ifa && ifa->idev->dev->nd_net != net)
2764 ifa = ifa->lst_next;
2765 if (ifa)
2766 break;
2767 }
2768 return ifa;
2769 }
2770
2771 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2772 {
2773 struct if6_iter_state *state = seq->private;
2774 struct net *net = state->p.net;
2775
2776 ifa = ifa->lst_next;
2777 try_again:
2778 if (ifa) {
2779 if (ifa->idev->dev->nd_net != net) {
2780 ifa = ifa->lst_next;
2781 goto try_again;
2782 }
2783 }
2784
2785 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2786 ifa = inet6_addr_lst[state->bucket];
2787 goto try_again;
2788 }
2789
2790 return ifa;
2791 }
2792
2793 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2794 {
2795 struct inet6_ifaddr *ifa = if6_get_first(seq);
2796
2797 if (ifa)
2798 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2799 --pos;
2800 return pos ? NULL : ifa;
2801 }
2802
2803 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2804 __acquires(addrconf_hash_lock)
2805 {
2806 read_lock_bh(&addrconf_hash_lock);
2807 return if6_get_idx(seq, *pos);
2808 }
2809
2810 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2811 {
2812 struct inet6_ifaddr *ifa;
2813
2814 ifa = if6_get_next(seq, v);
2815 ++*pos;
2816 return ifa;
2817 }
2818
2819 static void if6_seq_stop(struct seq_file *seq, void *v)
2820 __releases(addrconf_hash_lock)
2821 {
2822 read_unlock_bh(&addrconf_hash_lock);
2823 }
2824
2825 static int if6_seq_show(struct seq_file *seq, void *v)
2826 {
2827 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2828 seq_printf(seq,
2829 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2830 NIP6(ifp->addr),
2831 ifp->idev->dev->ifindex,
2832 ifp->prefix_len,
2833 ifp->scope,
2834 ifp->flags,
2835 ifp->idev->dev->name);
2836 return 0;
2837 }
2838
2839 static const struct seq_operations if6_seq_ops = {
2840 .start = if6_seq_start,
2841 .next = if6_seq_next,
2842 .show = if6_seq_show,
2843 .stop = if6_seq_stop,
2844 };
2845
2846 static int if6_seq_open(struct inode *inode, struct file *file)
2847 {
2848 return seq_open_net(inode, file, &if6_seq_ops,
2849 sizeof(struct if6_iter_state));
2850 }
2851
2852 static const struct file_operations if6_fops = {
2853 .owner = THIS_MODULE,
2854 .open = if6_seq_open,
2855 .read = seq_read,
2856 .llseek = seq_lseek,
2857 .release = seq_release_net,
2858 };
2859
2860 static int if6_proc_net_init(struct net *net)
2861 {
2862 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2863 return -ENOMEM;
2864 return 0;
2865 }
2866
2867 static void if6_proc_net_exit(struct net *net)
2868 {
2869 proc_net_remove(net, "if_inet6");
2870 }
2871
2872 static struct pernet_operations if6_proc_net_ops = {
2873 .init = if6_proc_net_init,
2874 .exit = if6_proc_net_exit,
2875 };
2876
2877 int __init if6_proc_init(void)
2878 {
2879 return register_pernet_subsys(&if6_proc_net_ops);
2880 }
2881
2882 void if6_proc_exit(void)
2883 {
2884 unregister_pernet_subsys(&if6_proc_net_ops);
2885 }
2886 #endif /* CONFIG_PROC_FS */
2887
2888 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2889 /* Check if address is a home address configured on any interface. */
2890 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2891 {
2892 int ret = 0;
2893 struct inet6_ifaddr * ifp;
2894 u8 hash = ipv6_addr_hash(addr);
2895 read_lock_bh(&addrconf_hash_lock);
2896 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2897 if (ifp->idev->dev->nd_net != net)
2898 continue;
2899 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2900 (ifp->flags & IFA_F_HOMEADDRESS)) {
2901 ret = 1;
2902 break;
2903 }
2904 }
2905 read_unlock_bh(&addrconf_hash_lock);
2906 return ret;
2907 }
2908 #endif
2909
2910 /*
2911 * Periodic address status verification
2912 */
2913
2914 static void addrconf_verify(unsigned long foo)
2915 {
2916 struct inet6_ifaddr *ifp;
2917 unsigned long now, next;
2918 int i;
2919
2920 spin_lock_bh(&addrconf_verify_lock);
2921 now = jiffies;
2922 next = now + ADDR_CHECK_FREQUENCY;
2923
2924 del_timer(&addr_chk_timer);
2925
2926 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2927
2928 restart:
2929 read_lock(&addrconf_hash_lock);
2930 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2931 unsigned long age;
2932 #ifdef CONFIG_IPV6_PRIVACY
2933 unsigned long regen_advance;
2934 #endif
2935
2936 if (ifp->flags & IFA_F_PERMANENT)
2937 continue;
2938
2939 spin_lock(&ifp->lock);
2940 age = (now - ifp->tstamp) / HZ;
2941
2942 #ifdef CONFIG_IPV6_PRIVACY
2943 regen_advance = ifp->idev->cnf.regen_max_retry *
2944 ifp->idev->cnf.dad_transmits *
2945 ifp->idev->nd_parms->retrans_time / HZ;
2946 #endif
2947
2948 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2949 age >= ifp->valid_lft) {
2950 spin_unlock(&ifp->lock);
2951 in6_ifa_hold(ifp);
2952 read_unlock(&addrconf_hash_lock);
2953 ipv6_del_addr(ifp);
2954 goto restart;
2955 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2956 spin_unlock(&ifp->lock);
2957 continue;
2958 } else if (age >= ifp->prefered_lft) {
2959 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2960 int deprecate = 0;
2961
2962 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2963 deprecate = 1;
2964 ifp->flags |= IFA_F_DEPRECATED;
2965 }
2966
2967 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2968 next = ifp->tstamp + ifp->valid_lft * HZ;
2969
2970 spin_unlock(&ifp->lock);
2971
2972 if (deprecate) {
2973 in6_ifa_hold(ifp);
2974 read_unlock(&addrconf_hash_lock);
2975
2976 ipv6_ifa_notify(0, ifp);
2977 in6_ifa_put(ifp);
2978 goto restart;
2979 }
2980 #ifdef CONFIG_IPV6_PRIVACY
2981 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2982 !(ifp->flags&IFA_F_TENTATIVE)) {
2983 if (age >= ifp->prefered_lft - regen_advance) {
2984 struct inet6_ifaddr *ifpub = ifp->ifpub;
2985 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2986 next = ifp->tstamp + ifp->prefered_lft * HZ;
2987 if (!ifp->regen_count && ifpub) {
2988 ifp->regen_count++;
2989 in6_ifa_hold(ifp);
2990 in6_ifa_hold(ifpub);
2991 spin_unlock(&ifp->lock);
2992 read_unlock(&addrconf_hash_lock);
2993 spin_lock(&ifpub->lock);
2994 ifpub->regen_count = 0;
2995 spin_unlock(&ifpub->lock);
2996 ipv6_create_tempaddr(ifpub, ifp);
2997 in6_ifa_put(ifpub);
2998 in6_ifa_put(ifp);
2999 goto restart;
3000 }
3001 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3002 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3003 spin_unlock(&ifp->lock);
3004 #endif
3005 } else {
3006 /* ifp->prefered_lft <= ifp->valid_lft */
3007 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3008 next = ifp->tstamp + ifp->prefered_lft * HZ;
3009 spin_unlock(&ifp->lock);
3010 }
3011 }
3012 read_unlock(&addrconf_hash_lock);
3013 }
3014
3015 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3016 add_timer(&addr_chk_timer);
3017 spin_unlock_bh(&addrconf_verify_lock);
3018 }
3019
3020 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3021 {
3022 struct in6_addr *pfx = NULL;
3023
3024 if (addr)
3025 pfx = nla_data(addr);
3026
3027 if (local) {
3028 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3029 pfx = NULL;
3030 else
3031 pfx = nla_data(local);
3032 }
3033
3034 return pfx;
3035 }
3036
3037 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3038 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3039 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3040 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3041 };
3042
3043 static int
3044 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3045 {
3046 struct net *net = skb->sk->sk_net;
3047 struct ifaddrmsg *ifm;
3048 struct nlattr *tb[IFA_MAX+1];
3049 struct in6_addr *pfx;
3050 int err;
3051
3052 if (net != &init_net)
3053 return -EINVAL;
3054
3055 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3056 if (err < 0)
3057 return err;
3058
3059 ifm = nlmsg_data(nlh);
3060 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3061 if (pfx == NULL)
3062 return -EINVAL;
3063
3064 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3065 }
3066
3067 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3068 u32 prefered_lft, u32 valid_lft)
3069 {
3070 u32 flags = RTF_EXPIRES;
3071
3072 if (!valid_lft || (prefered_lft > valid_lft))
3073 return -EINVAL;
3074
3075 if (valid_lft == INFINITY_LIFE_TIME) {
3076 ifa_flags |= IFA_F_PERMANENT;
3077 flags = 0;
3078 } else if (valid_lft >= 0x7FFFFFFF/HZ)
3079 valid_lft = 0x7FFFFFFF/HZ;
3080
3081 if (prefered_lft == 0)
3082 ifa_flags |= IFA_F_DEPRECATED;
3083 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3084 (prefered_lft != INFINITY_LIFE_TIME))
3085 prefered_lft = 0x7FFFFFFF/HZ;
3086
3087 spin_lock_bh(&ifp->lock);
3088 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3089 ifp->tstamp = jiffies;
3090 ifp->valid_lft = valid_lft;
3091 ifp->prefered_lft = prefered_lft;
3092
3093 spin_unlock_bh(&ifp->lock);
3094 if (!(ifp->flags&IFA_F_TENTATIVE))
3095 ipv6_ifa_notify(0, ifp);
3096
3097 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3098 jiffies_to_clock_t(valid_lft * HZ), flags);
3099 addrconf_verify(0);
3100
3101 return 0;
3102 }
3103
3104 static int
3105 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3106 {
3107 struct net *net = skb->sk->sk_net;
3108 struct ifaddrmsg *ifm;
3109 struct nlattr *tb[IFA_MAX+1];
3110 struct in6_addr *pfx;
3111 struct inet6_ifaddr *ifa;
3112 struct net_device *dev;
3113 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3114 u8 ifa_flags;
3115 int err;
3116
3117 if (net != &init_net)
3118 return -EINVAL;
3119
3120 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3121 if (err < 0)
3122 return err;
3123
3124 ifm = nlmsg_data(nlh);
3125 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3126 if (pfx == NULL)
3127 return -EINVAL;
3128
3129 if (tb[IFA_CACHEINFO]) {
3130 struct ifa_cacheinfo *ci;
3131
3132 ci = nla_data(tb[IFA_CACHEINFO]);
3133 valid_lft = ci->ifa_valid;
3134 preferred_lft = ci->ifa_prefered;
3135 } else {
3136 preferred_lft = INFINITY_LIFE_TIME;
3137 valid_lft = INFINITY_LIFE_TIME;
3138 }
3139
3140 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3141 if (dev == NULL)
3142 return -ENODEV;
3143
3144 /* We ignore other flags so far. */
3145 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3146
3147 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3148 if (ifa == NULL) {
3149 /*
3150 * It would be best to check for !NLM_F_CREATE here but
3151 * userspace alreay relies on not having to provide this.
3152 */
3153 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3154 ifa_flags, preferred_lft, valid_lft);
3155 }
3156
3157 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3158 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3159 err = -EEXIST;
3160 else
3161 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3162
3163 in6_ifa_put(ifa);
3164
3165 return err;
3166 }
3167
3168 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3169 u8 scope, int ifindex)
3170 {
3171 struct ifaddrmsg *ifm;
3172
3173 ifm = nlmsg_data(nlh);
3174 ifm->ifa_family = AF_INET6;
3175 ifm->ifa_prefixlen = prefixlen;
3176 ifm->ifa_flags = flags;
3177 ifm->ifa_scope = scope;
3178 ifm->ifa_index = ifindex;
3179 }
3180
3181 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3182 unsigned long tstamp, u32 preferred, u32 valid)
3183 {
3184 struct ifa_cacheinfo ci;
3185
3186 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3187 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3188 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3189 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3190 ci.ifa_prefered = preferred;
3191 ci.ifa_valid = valid;
3192
3193 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3194 }
3195
3196 static inline int rt_scope(int ifa_scope)
3197 {
3198 if (ifa_scope & IFA_HOST)
3199 return RT_SCOPE_HOST;
3200 else if (ifa_scope & IFA_LINK)
3201 return RT_SCOPE_LINK;
3202 else if (ifa_scope & IFA_SITE)
3203 return RT_SCOPE_SITE;
3204 else
3205 return RT_SCOPE_UNIVERSE;
3206 }
3207
3208 static inline int inet6_ifaddr_msgsize(void)
3209 {
3210 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3211 + nla_total_size(16) /* IFA_ADDRESS */
3212 + nla_total_size(sizeof(struct ifa_cacheinfo));
3213 }
3214
3215 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3216 u32 pid, u32 seq, int event, unsigned int flags)
3217 {
3218 struct nlmsghdr *nlh;
3219 u32 preferred, valid;
3220
3221 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3222 if (nlh == NULL)
3223 return -EMSGSIZE;
3224
3225 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3226 ifa->idev->dev->ifindex);
3227
3228 if (!(ifa->flags&IFA_F_PERMANENT)) {
3229 preferred = ifa->prefered_lft;
3230 valid = ifa->valid_lft;
3231 if (preferred != INFINITY_LIFE_TIME) {
3232 long tval = (jiffies - ifa->tstamp)/HZ;
3233 preferred -= tval;
3234 if (valid != INFINITY_LIFE_TIME)
3235 valid -= tval;
3236 }
3237 } else {
3238 preferred = INFINITY_LIFE_TIME;
3239 valid = INFINITY_LIFE_TIME;
3240 }
3241
3242 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3243 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3244 nlmsg_cancel(skb, nlh);
3245 return -EMSGSIZE;
3246 }
3247
3248 return nlmsg_end(skb, nlh);
3249 }
3250
3251 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3252 u32 pid, u32 seq, int event, u16 flags)
3253 {
3254 struct nlmsghdr *nlh;
3255 u8 scope = RT_SCOPE_UNIVERSE;
3256 int ifindex = ifmca->idev->dev->ifindex;
3257
3258 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3259 scope = RT_SCOPE_SITE;
3260
3261 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3262 if (nlh == NULL)
3263 return -EMSGSIZE;
3264
3265 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3266 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3267 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3268 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3269 nlmsg_cancel(skb, nlh);
3270 return -EMSGSIZE;
3271 }
3272
3273 return nlmsg_end(skb, nlh);
3274 }
3275
3276 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3277 u32 pid, u32 seq, int event, unsigned int flags)
3278 {
3279 struct nlmsghdr *nlh;
3280 u8 scope = RT_SCOPE_UNIVERSE;
3281 int ifindex = ifaca->aca_idev->dev->ifindex;
3282
3283 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3284 scope = RT_SCOPE_SITE;
3285
3286 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3287 if (nlh == NULL)
3288 return -EMSGSIZE;
3289
3290 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3291 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3292 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3293 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3294 nlmsg_cancel(skb, nlh);
3295 return -EMSGSIZE;
3296 }
3297
3298 return nlmsg_end(skb, nlh);
3299 }
3300
3301 enum addr_type_t
3302 {
3303 UNICAST_ADDR,
3304 MULTICAST_ADDR,
3305 ANYCAST_ADDR,
3306 };
3307
3308 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3309 enum addr_type_t type)
3310 {
3311 int idx, ip_idx;
3312 int s_idx, s_ip_idx;
3313 int err = 1;
3314 struct net_device *dev;
3315 struct inet6_dev *idev = NULL;
3316 struct inet6_ifaddr *ifa;
3317 struct ifmcaddr6 *ifmca;
3318 struct ifacaddr6 *ifaca;
3319
3320 s_idx = cb->args[0];
3321 s_ip_idx = ip_idx = cb->args[1];
3322
3323 idx = 0;
3324 for_each_netdev(&init_net, dev) {
3325 if (idx < s_idx)
3326 goto cont;
3327 if (idx > s_idx)
3328 s_ip_idx = 0;
3329 ip_idx = 0;
3330 if ((idev = in6_dev_get(dev)) == NULL)
3331 goto cont;
3332 read_lock_bh(&idev->lock);
3333 switch (type) {
3334 case UNICAST_ADDR:
3335 /* unicast address incl. temp addr */
3336 for (ifa = idev->addr_list; ifa;
3337 ifa = ifa->if_next, ip_idx++) {
3338 if (ip_idx < s_ip_idx)
3339 continue;
3340 err = inet6_fill_ifaddr(skb, ifa,
3341 NETLINK_CB(cb->skb).pid,
3342 cb->nlh->nlmsg_seq,
3343 RTM_NEWADDR,
3344 NLM_F_MULTI);
3345 }
3346 break;
3347 case MULTICAST_ADDR:
3348 /* multicast address */
3349 for (ifmca = idev->mc_list; ifmca;
3350 ifmca = ifmca->next, ip_idx++) {
3351 if (ip_idx < s_ip_idx)
3352 continue;
3353 err = inet6_fill_ifmcaddr(skb, ifmca,
3354 NETLINK_CB(cb->skb).pid,
3355 cb->nlh->nlmsg_seq,
3356 RTM_GETMULTICAST,
3357 NLM_F_MULTI);
3358 }
3359 break;
3360 case ANYCAST_ADDR:
3361 /* anycast address */
3362 for (ifaca = idev->ac_list; ifaca;
3363 ifaca = ifaca->aca_next, ip_idx++) {
3364 if (ip_idx < s_ip_idx)
3365 continue;
3366 err = inet6_fill_ifacaddr(skb, ifaca,
3367 NETLINK_CB(cb->skb).pid,
3368 cb->nlh->nlmsg_seq,
3369 RTM_GETANYCAST,
3370 NLM_F_MULTI);
3371 }
3372 break;
3373 default:
3374 break;
3375 }
3376 read_unlock_bh(&idev->lock);
3377 in6_dev_put(idev);
3378
3379 if (err <= 0)
3380 break;
3381 cont:
3382 idx++;
3383 }
3384 cb->args[0] = idx;
3385 cb->args[1] = ip_idx;
3386 return skb->len;
3387 }
3388
3389 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3390 {
3391 struct net *net = skb->sk->sk_net;
3392 enum addr_type_t type = UNICAST_ADDR;
3393
3394 if (net != &init_net)
3395 return 0;
3396
3397 return inet6_dump_addr(skb, cb, type);
3398 }
3399
3400 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3401 {
3402 struct net *net = skb->sk->sk_net;
3403 enum addr_type_t type = MULTICAST_ADDR;
3404
3405 if (net != &init_net)
3406 return 0;
3407
3408 return inet6_dump_addr(skb, cb, type);
3409 }
3410
3411
3412 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3413 {
3414 struct net *net = skb->sk->sk_net;
3415 enum addr_type_t type = ANYCAST_ADDR;
3416
3417 if (net != &init_net)
3418 return 0;
3419
3420 return inet6_dump_addr(skb, cb, type);
3421 }
3422
3423 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3424 void *arg)
3425 {
3426 struct net *net = in_skb->sk->sk_net;
3427 struct ifaddrmsg *ifm;
3428 struct nlattr *tb[IFA_MAX+1];
3429 struct in6_addr *addr = NULL;
3430 struct net_device *dev = NULL;
3431 struct inet6_ifaddr *ifa;
3432 struct sk_buff *skb;
3433 int err;
3434
3435 if (net != &init_net)
3436 return -EINVAL;
3437
3438 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3439 if (err < 0)
3440 goto errout;
3441
3442 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3443 if (addr == NULL) {
3444 err = -EINVAL;
3445 goto errout;
3446 }
3447
3448 ifm = nlmsg_data(nlh);
3449 if (ifm->ifa_index)
3450 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3451
3452 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3453 err = -EADDRNOTAVAIL;
3454 goto errout;
3455 }
3456
3457 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3458 err = -ENOBUFS;
3459 goto errout_ifa;
3460 }
3461
3462 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3463 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3464 if (err < 0) {
3465 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3466 WARN_ON(err == -EMSGSIZE);
3467 kfree_skb(skb);
3468 goto errout_ifa;
3469 }
3470 err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
3471 errout_ifa:
3472 in6_ifa_put(ifa);
3473 errout:
3474 return err;
3475 }
3476
3477 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3478 {
3479 struct sk_buff *skb;
3480 int err = -ENOBUFS;
3481
3482 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3483 if (skb == NULL)
3484 goto errout;
3485
3486 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3487 if (err < 0) {
3488 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3489 WARN_ON(err == -EMSGSIZE);
3490 kfree_skb(skb);
3491 goto errout;
3492 }
3493 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3494 errout:
3495 if (err < 0)
3496 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3497 }
3498
3499 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3500 __s32 *array, int bytes)
3501 {
3502 BUG_ON(bytes < (DEVCONF_MAX * 4));
3503
3504 memset(array, 0, bytes);
3505 array[DEVCONF_FORWARDING] = cnf->forwarding;
3506 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3507 array[DEVCONF_MTU6] = cnf->mtu6;
3508 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3509 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3510 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3511 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3512 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3513 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3514 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3515 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3516 #ifdef CONFIG_IPV6_PRIVACY
3517 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3518 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3519 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3520 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3521 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3522 #endif
3523 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3524 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3525 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3526 #ifdef CONFIG_IPV6_ROUTER_PREF
3527 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3528 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3529 #ifdef CONFIG_IPV6_ROUTE_INFO
3530 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3531 #endif
3532 #endif
3533 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3534 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3535 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3536 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3537 #endif
3538 }
3539
3540 static inline size_t inet6_if_nlmsg_size(void)
3541 {
3542 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3543 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3544 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3545 + nla_total_size(4) /* IFLA_MTU */
3546 + nla_total_size(4) /* IFLA_LINK */
3547 + nla_total_size( /* IFLA_PROTINFO */
3548 nla_total_size(4) /* IFLA_INET6_FLAGS */
3549 + nla_total_size(sizeof(struct ifla_cacheinfo))
3550 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3551 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3552 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3553 );
3554 }
3555
3556 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3557 int bytes)
3558 {
3559 int i;
3560 int pad = bytes - sizeof(u64) * items;
3561 BUG_ON(pad < 0);
3562
3563 /* Use put_unaligned() because stats may not be aligned for u64. */
3564 put_unaligned(items, &stats[0]);
3565 for (i = 1; i < items; i++)
3566 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3567
3568 memset(&stats[items], 0, pad);
3569 }
3570
3571 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3572 int bytes)
3573 {
3574 switch(attrtype) {
3575 case IFLA_INET6_STATS:
3576 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3577 break;
3578 case IFLA_INET6_ICMP6STATS:
3579 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3580 break;
3581 }
3582 }
3583
3584 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3585 u32 pid, u32 seq, int event, unsigned int flags)
3586 {
3587 struct net_device *dev = idev->dev;
3588 struct nlattr *nla;
3589 struct ifinfomsg *hdr;
3590 struct nlmsghdr *nlh;
3591 void *protoinfo;
3592 struct ifla_cacheinfo ci;
3593
3594 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3595 if (nlh == NULL)
3596 return -EMSGSIZE;
3597
3598 hdr = nlmsg_data(nlh);
3599 hdr->ifi_family = AF_INET6;
3600 hdr->__ifi_pad = 0;
3601 hdr->ifi_type = dev->type;
3602 hdr->ifi_index = dev->ifindex;
3603 hdr->ifi_flags = dev_get_flags(dev);
3604 hdr->ifi_change = 0;
3605
3606 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3607
3608 if (dev->addr_len)
3609 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3610
3611 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3612 if (dev->ifindex != dev->iflink)
3613 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3614
3615 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3616 if (protoinfo == NULL)
3617 goto nla_put_failure;
3618
3619 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3620
3621 ci.max_reasm_len = IPV6_MAXPLEN;
3622 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3623 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3624 ci.reachable_time = idev->nd_parms->reachable_time;
3625 ci.retrans_time = idev->nd_parms->retrans_time;
3626 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3627
3628 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3629 if (nla == NULL)
3630 goto nla_put_failure;
3631 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3632
3633 /* XXX - MC not implemented */
3634
3635 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3636 if (nla == NULL)
3637 goto nla_put_failure;
3638 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3639
3640 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3641 if (nla == NULL)
3642 goto nla_put_failure;
3643 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3644
3645 nla_nest_end(skb, protoinfo);
3646 return nlmsg_end(skb, nlh);
3647
3648 nla_put_failure:
3649 nlmsg_cancel(skb, nlh);
3650 return -EMSGSIZE;
3651 }
3652
3653 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3654 {
3655 struct net *net = skb->sk->sk_net;
3656 int idx, err;
3657 int s_idx = cb->args[0];
3658 struct net_device *dev;
3659 struct inet6_dev *idev;
3660
3661 if (net != &init_net)
3662 return 0;
3663
3664 read_lock(&dev_base_lock);
3665 idx = 0;
3666 for_each_netdev(&init_net, dev) {
3667 if (idx < s_idx)
3668 goto cont;
3669 if ((idev = in6_dev_get(dev)) == NULL)
3670 goto cont;
3671 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3672 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3673 in6_dev_put(idev);
3674 if (err <= 0)
3675 break;
3676 cont:
3677 idx++;
3678 }
3679 read_unlock(&dev_base_lock);
3680 cb->args[0] = idx;
3681
3682 return skb->len;
3683 }
3684
3685 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3686 {
3687 struct sk_buff *skb;
3688 int err = -ENOBUFS;
3689
3690 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3691 if (skb == NULL)
3692 goto errout;
3693
3694 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3695 if (err < 0) {
3696 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3697 WARN_ON(err == -EMSGSIZE);
3698 kfree_skb(skb);
3699 goto errout;
3700 }
3701 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3702 errout:
3703 if (err < 0)
3704 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3705 }
3706
3707 static inline size_t inet6_prefix_nlmsg_size(void)
3708 {
3709 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3710 + nla_total_size(sizeof(struct in6_addr))
3711 + nla_total_size(sizeof(struct prefix_cacheinfo));
3712 }
3713
3714 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3715 struct prefix_info *pinfo, u32 pid, u32 seq,
3716 int event, unsigned int flags)
3717 {
3718 struct prefixmsg *pmsg;
3719 struct nlmsghdr *nlh;
3720 struct prefix_cacheinfo ci;
3721
3722 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3723 if (nlh == NULL)
3724 return -EMSGSIZE;
3725
3726 pmsg = nlmsg_data(nlh);
3727 pmsg->prefix_family = AF_INET6;
3728 pmsg->prefix_pad1 = 0;
3729 pmsg->prefix_pad2 = 0;
3730 pmsg->prefix_ifindex = idev->dev->ifindex;
3731 pmsg->prefix_len = pinfo->prefix_len;
3732 pmsg->prefix_type = pinfo->type;
3733 pmsg->prefix_pad3 = 0;
3734 pmsg->prefix_flags = 0;
3735 if (pinfo->onlink)
3736 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3737 if (pinfo->autoconf)
3738 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3739
3740 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3741
3742 ci.preferred_time = ntohl(pinfo->prefered);
3743 ci.valid_time = ntohl(pinfo->valid);
3744 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3745
3746 return nlmsg_end(skb, nlh);
3747
3748 nla_put_failure:
3749 nlmsg_cancel(skb, nlh);
3750 return -EMSGSIZE;
3751 }
3752
3753 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3754 struct prefix_info *pinfo)
3755 {
3756 struct sk_buff *skb;
3757 int err = -ENOBUFS;
3758
3759 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3760 if (skb == NULL)
3761 goto errout;
3762
3763 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3764 if (err < 0) {
3765 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3766 WARN_ON(err == -EMSGSIZE);
3767 kfree_skb(skb);
3768 goto errout;
3769 }
3770 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3771 errout:
3772 if (err < 0)
3773 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
3774 }
3775
3776 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3777 {
3778 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3779
3780 switch (event) {
3781 case RTM_NEWADDR:
3782 /*
3783 * If the address was optimistic
3784 * we inserted the route at the start of
3785 * our DAD process, so we don't need
3786 * to do it again
3787 */
3788 if (!(ifp->rt->rt6i_node))
3789 ip6_ins_rt(ifp->rt);
3790 if (ifp->idev->cnf.forwarding)
3791 addrconf_join_anycast(ifp);
3792 break;
3793 case RTM_DELADDR:
3794 if (ifp->idev->cnf.forwarding)
3795 addrconf_leave_anycast(ifp);
3796 addrconf_leave_solict(ifp->idev, &ifp->addr);
3797 dst_hold(&ifp->rt->u.dst);
3798 if (ip6_del_rt(ifp->rt))
3799 dst_free(&ifp->rt->u.dst);
3800 break;
3801 }
3802 }
3803
3804 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3805 {
3806 rcu_read_lock_bh();
3807 if (likely(ifp->idev->dead == 0))
3808 __ipv6_ifa_notify(event, ifp);
3809 rcu_read_unlock_bh();
3810 }
3811
3812 #ifdef CONFIG_SYSCTL
3813
3814 static
3815 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3816 void __user *buffer, size_t *lenp, loff_t *ppos)
3817 {
3818 int *valp = ctl->data;
3819 int val = *valp;
3820 int ret;
3821
3822 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3823
3824 if (write)
3825 addrconf_fixup_forwarding(ctl, valp, val);
3826 return ret;
3827 }
3828
3829 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3830 int __user *name, int nlen,
3831 void __user *oldval,
3832 size_t __user *oldlenp,
3833 void __user *newval, size_t newlen)
3834 {
3835 int *valp = table->data;
3836 int val = *valp;
3837 int new;
3838
3839 if (!newval || !newlen)
3840 return 0;
3841 if (newlen != sizeof(int))
3842 return -EINVAL;
3843 if (get_user(new, (int __user *)newval))
3844 return -EFAULT;
3845 if (new == *valp)
3846 return 0;
3847 if (oldval && oldlenp) {
3848 size_t len;
3849 if (get_user(len, oldlenp))
3850 return -EFAULT;
3851 if (len) {
3852 if (len > table->maxlen)
3853 len = table->maxlen;
3854 if (copy_to_user(oldval, valp, len))
3855 return -EFAULT;
3856 if (put_user(len, oldlenp))
3857 return -EFAULT;
3858 }
3859 }
3860
3861 *valp = new;
3862 addrconf_fixup_forwarding(table, valp, val);
3863 return 1;
3864 }
3865
3866 static struct addrconf_sysctl_table
3867 {
3868 struct ctl_table_header *sysctl_header;
3869 ctl_table addrconf_vars[__NET_IPV6_MAX];
3870 char *dev_name;
3871 } addrconf_sysctl __read_mostly = {
3872 .sysctl_header = NULL,
3873 .addrconf_vars = {
3874 {
3875 .ctl_name = NET_IPV6_FORWARDING,
3876 .procname = "forwarding",
3877 .data = &ipv6_devconf.forwarding,
3878 .maxlen = sizeof(int),
3879 .mode = 0644,
3880 .proc_handler = &addrconf_sysctl_forward,
3881 .strategy = &addrconf_sysctl_forward_strategy,
3882 },
3883 {
3884 .ctl_name = NET_IPV6_HOP_LIMIT,
3885 .procname = "hop_limit",
3886 .data = &ipv6_devconf.hop_limit,
3887 .maxlen = sizeof(int),
3888 .mode = 0644,
3889 .proc_handler = proc_dointvec,
3890 },
3891 {
3892 .ctl_name = NET_IPV6_MTU,
3893 .procname = "mtu",
3894 .data = &ipv6_devconf.mtu6,
3895 .maxlen = sizeof(int),
3896 .mode = 0644,
3897 .proc_handler = &proc_dointvec,
3898 },
3899 {
3900 .ctl_name = NET_IPV6_ACCEPT_RA,
3901 .procname = "accept_ra",
3902 .data = &ipv6_devconf.accept_ra,
3903 .maxlen = sizeof(int),
3904 .mode = 0644,
3905 .proc_handler = &proc_dointvec,
3906 },
3907 {
3908 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3909 .procname = "accept_redirects",
3910 .data = &ipv6_devconf.accept_redirects,
3911 .maxlen = sizeof(int),
3912 .mode = 0644,
3913 .proc_handler = &proc_dointvec,
3914 },
3915 {
3916 .ctl_name = NET_IPV6_AUTOCONF,
3917 .procname = "autoconf",
3918 .data = &ipv6_devconf.autoconf,
3919 .maxlen = sizeof(int),
3920 .mode = 0644,
3921 .proc_handler = &proc_dointvec,
3922 },
3923 {
3924 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3925 .procname = "dad_transmits",
3926 .data = &ipv6_devconf.dad_transmits,
3927 .maxlen = sizeof(int),
3928 .mode = 0644,
3929 .proc_handler = &proc_dointvec,
3930 },
3931 {
3932 .ctl_name = NET_IPV6_RTR_SOLICITS,
3933 .procname = "router_solicitations",
3934 .data = &ipv6_devconf.rtr_solicits,
3935 .maxlen = sizeof(int),
3936 .mode = 0644,
3937 .proc_handler = &proc_dointvec,
3938 },
3939 {
3940 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3941 .procname = "router_solicitation_interval",
3942 .data = &ipv6_devconf.rtr_solicit_interval,
3943 .maxlen = sizeof(int),
3944 .mode = 0644,
3945 .proc_handler = &proc_dointvec_jiffies,
3946 .strategy = &sysctl_jiffies,
3947 },
3948 {
3949 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3950 .procname = "router_solicitation_delay",
3951 .data = &ipv6_devconf.rtr_solicit_delay,
3952 .maxlen = sizeof(int),
3953 .mode = 0644,
3954 .proc_handler = &proc_dointvec_jiffies,
3955 .strategy = &sysctl_jiffies,
3956 },
3957 {
3958 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3959 .procname = "force_mld_version",
3960 .data = &ipv6_devconf.force_mld_version,
3961 .maxlen = sizeof(int),
3962 .mode = 0644,
3963 .proc_handler = &proc_dointvec,
3964 },
3965 #ifdef CONFIG_IPV6_PRIVACY
3966 {
3967 .ctl_name = NET_IPV6_USE_TEMPADDR,
3968 .procname = "use_tempaddr",
3969 .data = &ipv6_devconf.use_tempaddr,
3970 .maxlen = sizeof(int),
3971 .mode = 0644,
3972 .proc_handler = &proc_dointvec,
3973 },
3974 {
3975 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3976 .procname = "temp_valid_lft",
3977 .data = &ipv6_devconf.temp_valid_lft,
3978 .maxlen = sizeof(int),
3979 .mode = 0644,
3980 .proc_handler = &proc_dointvec,
3981 },
3982 {
3983 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3984 .procname = "temp_prefered_lft",
3985 .data = &ipv6_devconf.temp_prefered_lft,
3986 .maxlen = sizeof(int),
3987 .mode = 0644,
3988 .proc_handler = &proc_dointvec,
3989 },
3990 {
3991 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3992 .procname = "regen_max_retry",
3993 .data = &ipv6_devconf.regen_max_retry,
3994 .maxlen = sizeof(int),
3995 .mode = 0644,
3996 .proc_handler = &proc_dointvec,
3997 },
3998 {
3999 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4000 .procname = "max_desync_factor",
4001 .data = &ipv6_devconf.max_desync_factor,
4002 .maxlen = sizeof(int),
4003 .mode = 0644,
4004 .proc_handler = &proc_dointvec,
4005 },
4006 #endif
4007 {
4008 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4009 .procname = "max_addresses",
4010 .data = &ipv6_devconf.max_addresses,
4011 .maxlen = sizeof(int),
4012 .mode = 0644,
4013 .proc_handler = &proc_dointvec,
4014 },
4015 {
4016 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4017 .procname = "accept_ra_defrtr",
4018 .data = &ipv6_devconf.accept_ra_defrtr,
4019 .maxlen = sizeof(int),
4020 .mode = 0644,
4021 .proc_handler = &proc_dointvec,
4022 },
4023 {
4024 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4025 .procname = "accept_ra_pinfo",
4026 .data = &ipv6_devconf.accept_ra_pinfo,
4027 .maxlen = sizeof(int),
4028 .mode = 0644,
4029 .proc_handler = &proc_dointvec,
4030 },
4031 #ifdef CONFIG_IPV6_ROUTER_PREF
4032 {
4033 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4034 .procname = "accept_ra_rtr_pref",
4035 .data = &ipv6_devconf.accept_ra_rtr_pref,
4036 .maxlen = sizeof(int),
4037 .mode = 0644,
4038 .proc_handler = &proc_dointvec,
4039 },
4040 {
4041 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4042 .procname = "router_probe_interval",
4043 .data = &ipv6_devconf.rtr_probe_interval,
4044 .maxlen = sizeof(int),
4045 .mode = 0644,
4046 .proc_handler = &proc_dointvec_jiffies,
4047 .strategy = &sysctl_jiffies,
4048 },
4049 #ifdef CONFIG_IPV6_ROUTE_INFO
4050 {
4051 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4052 .procname = "accept_ra_rt_info_max_plen",
4053 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4054 .maxlen = sizeof(int),
4055 .mode = 0644,
4056 .proc_handler = &proc_dointvec,
4057 },
4058 #endif
4059 #endif
4060 {
4061 .ctl_name = NET_IPV6_PROXY_NDP,
4062 .procname = "proxy_ndp",
4063 .data = &ipv6_devconf.proxy_ndp,
4064 .maxlen = sizeof(int),
4065 .mode = 0644,
4066 .proc_handler = &proc_dointvec,
4067 },
4068 {
4069 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4070 .procname = "accept_source_route",
4071 .data = &ipv6_devconf.accept_source_route,
4072 .maxlen = sizeof(int),
4073 .mode = 0644,
4074 .proc_handler = &proc_dointvec,
4075 },
4076 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4077 {
4078 .ctl_name = CTL_UNNUMBERED,
4079 .procname = "optimistic_dad",
4080 .data = &ipv6_devconf.optimistic_dad,
4081 .maxlen = sizeof(int),
4082 .mode = 0644,
4083 .proc_handler = &proc_dointvec,
4084
4085 },
4086 #endif
4087 {
4088 .ctl_name = 0, /* sentinel */
4089 }
4090 },
4091 };
4092
4093 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4094 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4095 {
4096 int i;
4097 struct addrconf_sysctl_table *t;
4098
4099 #define ADDRCONF_CTL_PATH_DEV 3
4100
4101 struct ctl_path addrconf_ctl_path[] = {
4102 { .procname = "net", .ctl_name = CTL_NET, },
4103 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4104 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4105 { /* to be set */ },
4106 { },
4107 };
4108
4109
4110 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4111 if (t == NULL)
4112 goto out;
4113
4114 for (i=0; t->addrconf_vars[i].data; i++) {
4115 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4116 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4117 t->addrconf_vars[i].extra2 = net;
4118 }
4119
4120 /*
4121 * Make a copy of dev_name, because '.procname' is regarded as const
4122 * by sysctl and we wouldn't want anyone to change it under our feet
4123 * (see SIOCSIFNAME).
4124 */
4125 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4126 if (!t->dev_name)
4127 goto free;
4128
4129 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4130 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4131
4132 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4133 t->addrconf_vars);
4134 if (t->sysctl_header == NULL)
4135 goto free_procname;
4136
4137 p->sysctl = t;
4138 return 0;
4139
4140 free_procname:
4141 kfree(t->dev_name);
4142 free:
4143 kfree(t);
4144 out:
4145 return -ENOBUFS;
4146 }
4147
4148 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4149 {
4150 struct addrconf_sysctl_table *t;
4151
4152 if (p->sysctl == NULL)
4153 return;
4154
4155 t = p->sysctl;
4156 p->sysctl = NULL;
4157 unregister_sysctl_table(t->sysctl_header);
4158 kfree(t->dev_name);
4159 kfree(t);
4160 }
4161
4162 static void addrconf_sysctl_register(struct inet6_dev *idev)
4163 {
4164 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4165 NET_IPV6_NEIGH, "ipv6",
4166 &ndisc_ifinfo_sysctl_change,
4167 NULL);
4168 __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
4169 idev->dev->ifindex, idev, &idev->cnf);
4170 }
4171
4172 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4173 {
4174 __addrconf_sysctl_unregister(&idev->cnf);
4175 neigh_sysctl_unregister(idev->nd_parms);
4176 }
4177
4178
4179 #endif
4180
4181 static int addrconf_init_net(struct net *net)
4182 {
4183 int err;
4184 struct ipv6_devconf *all, *dflt;
4185
4186 err = -ENOMEM;
4187 all = &ipv6_devconf;
4188 dflt = &ipv6_devconf_dflt;
4189
4190 if (net != &init_net) {
4191 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4192 if (all == NULL)
4193 goto err_alloc_all;
4194
4195 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4196 if (dflt == NULL)
4197 goto err_alloc_dflt;
4198 }
4199
4200 net->ipv6.devconf_all = all;
4201 net->ipv6.devconf_dflt = dflt;
4202
4203 #ifdef CONFIG_SYSCTL
4204 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4205 NULL, all);
4206 if (err < 0)
4207 goto err_reg_all;
4208
4209 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4210 NULL, dflt);
4211 if (err < 0)
4212 goto err_reg_dflt;
4213 #endif
4214 return 0;
4215
4216 #ifdef CONFIG_SYSCTL
4217 err_reg_dflt:
4218 __addrconf_sysctl_unregister(all);
4219 err_reg_all:
4220 kfree(dflt);
4221 #endif
4222 err_alloc_dflt:
4223 kfree(all);
4224 err_alloc_all:
4225 return err;
4226 }
4227
4228 static void addrconf_exit_net(struct net *net)
4229 {
4230 #ifdef CONFIG_SYSCTL
4231 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4232 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4233 #endif
4234 if (net != &init_net) {
4235 kfree(net->ipv6.devconf_dflt);
4236 kfree(net->ipv6.devconf_all);
4237 }
4238 }
4239
4240 static struct pernet_operations addrconf_ops = {
4241 .init = addrconf_init_net,
4242 .exit = addrconf_exit_net,
4243 };
4244
4245 /*
4246 * Device notifier
4247 */
4248
4249 int register_inet6addr_notifier(struct notifier_block *nb)
4250 {
4251 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4252 }
4253
4254 EXPORT_SYMBOL(register_inet6addr_notifier);
4255
4256 int unregister_inet6addr_notifier(struct notifier_block *nb)
4257 {
4258 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4259 }
4260
4261 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4262
4263 /*
4264 * Init / cleanup code
4265 */
4266
4267 int __init addrconf_init(void)
4268 {
4269 int err;
4270
4271 if ((err = ipv6_addr_label_init()) < 0) {
4272 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4273 err);
4274 return err;
4275 }
4276
4277 register_pernet_subsys(&addrconf_ops);
4278
4279 /* The addrconf netdev notifier requires that loopback_dev
4280 * has it's ipv6 private information allocated and setup
4281 * before it can bring up and give link-local addresses
4282 * to other devices which are up.
4283 *
4284 * Unfortunately, loopback_dev is not necessarily the first
4285 * entry in the global dev_base list of net devices. In fact,
4286 * it is likely to be the very last entry on that list.
4287 * So this causes the notifier registry below to try and
4288 * give link-local addresses to all devices besides loopback_dev
4289 * first, then loopback_dev, which cases all the non-loopback_dev
4290 * devices to fail to get a link-local address.
4291 *
4292 * So, as a temporary fix, allocate the ipv6 structure for
4293 * loopback_dev first by hand.
4294 * Longer term, all of the dependencies ipv6 has upon the loopback
4295 * device and it being up should be removed.
4296 */
4297 rtnl_lock();
4298 if (!ipv6_add_dev(init_net.loopback_dev))
4299 err = -ENOMEM;
4300 rtnl_unlock();
4301 if (err)
4302 goto errlo;
4303
4304 ip6_null_entry->u.dst.dev = init_net.loopback_dev;
4305 ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
4306 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4307 ip6_prohibit_entry->u.dst.dev = init_net.loopback_dev;
4308 ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
4309 ip6_blk_hole_entry->u.dst.dev = init_net.loopback_dev;
4310 ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
4311 #endif
4312
4313 register_netdevice_notifier(&ipv6_dev_notf);
4314
4315 addrconf_verify(0);
4316
4317 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4318 if (err < 0)
4319 goto errout;
4320
4321 /* Only the first call to __rtnl_register can fail */
4322 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4323 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4324 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4325 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4326 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4327
4328 ipv6_addr_label_rtnl_register();
4329
4330 return 0;
4331 errout:
4332 unregister_netdevice_notifier(&ipv6_dev_notf);
4333 errlo:
4334 unregister_pernet_subsys(&addrconf_ops);
4335
4336 return err;
4337 }
4338
4339 void addrconf_cleanup(void)
4340 {
4341 struct net_device *dev;
4342 struct inet6_ifaddr *ifa;
4343 int i;
4344
4345 unregister_netdevice_notifier(&ipv6_dev_notf);
4346
4347 unregister_pernet_subsys(&addrconf_ops);
4348
4349 rtnl_lock();
4350
4351 /*
4352 * clean dev list.
4353 */
4354
4355 for_each_netdev(&init_net, dev) {
4356 if (__in6_dev_get(dev) == NULL)
4357 continue;
4358 addrconf_ifdown(dev, 1);
4359 }
4360 addrconf_ifdown(init_net.loopback_dev, 2);
4361
4362 /*
4363 * Check hash table.
4364 */
4365
4366 write_lock_bh(&addrconf_hash_lock);
4367 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4368 for (ifa=inet6_addr_lst[i]; ifa; ) {
4369 struct inet6_ifaddr *bifa;
4370
4371 bifa = ifa;
4372 ifa = ifa->lst_next;
4373 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4374 /* Do not free it; something is wrong.
4375 Now we can investigate it with debugger.
4376 */
4377 }
4378 }
4379 write_unlock_bh(&addrconf_hash_lock);
4380
4381 del_timer(&addr_chk_timer);
4382
4383 rtnl_unlock();
4384 }
Linux kernel - Deliverables
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