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ipv6: fix inet6_init/icmpv6_cleanup sections mismatch
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / addrconf.c
blob18e3a9825d8124347d26957e100e5d527a13075e
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();
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(&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
1171 int ipv6_get_saddr(struct dst_entry *dst,
1172 struct in6_addr *daddr, struct in6_addr *saddr)
1173 {
1174 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1175 }
1176
1177 EXPORT_SYMBOL(ipv6_get_saddr);
1178
1179 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1180 unsigned char banned_flags)
1181 {
1182 struct inet6_dev *idev;
1183 int err = -EADDRNOTAVAIL;
1184
1185 rcu_read_lock();
1186 if ((idev = __in6_dev_get(dev)) != NULL) {
1187 struct inet6_ifaddr *ifp;
1188
1189 read_lock_bh(&idev->lock);
1190 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1191 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1192 ipv6_addr_copy(addr, &ifp->addr);
1193 err = 0;
1194 break;
1195 }
1196 }
1197 read_unlock_bh(&idev->lock);
1198 }
1199 rcu_read_unlock();
1200 return err;
1201 }
1202
1203 static int ipv6_count_addresses(struct inet6_dev *idev)
1204 {
1205 int cnt = 0;
1206 struct inet6_ifaddr *ifp;
1207
1208 read_lock_bh(&idev->lock);
1209 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1210 cnt++;
1211 read_unlock_bh(&idev->lock);
1212 return cnt;
1213 }
1214
1215 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1216 struct net_device *dev, int strict)
1217 {
1218 struct inet6_ifaddr * ifp;
1219 u8 hash = ipv6_addr_hash(addr);
1220
1221 read_lock_bh(&addrconf_hash_lock);
1222 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1223 if (ifp->idev->dev->nd_net != net)
1224 continue;
1225 if (ipv6_addr_equal(&ifp->addr, addr) &&
1226 !(ifp->flags&IFA_F_TENTATIVE)) {
1227 if (dev == NULL || ifp->idev->dev == dev ||
1228 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1229 break;
1230 }
1231 }
1232 read_unlock_bh(&addrconf_hash_lock);
1233 return ifp != NULL;
1234 }
1235 EXPORT_SYMBOL(ipv6_chk_addr);
1236
1237 static
1238 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1239 struct net_device *dev)
1240 {
1241 struct inet6_ifaddr * ifp;
1242 u8 hash = ipv6_addr_hash(addr);
1243
1244 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1245 if (ifp->idev->dev->nd_net != net)
1246 continue;
1247 if (ipv6_addr_equal(&ifp->addr, addr)) {
1248 if (dev == NULL || ifp->idev->dev == dev)
1249 break;
1250 }
1251 }
1252 return ifp != NULL;
1253 }
1254
1255 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1256 struct net_device *dev, int strict)
1257 {
1258 struct inet6_ifaddr * ifp;
1259 u8 hash = ipv6_addr_hash(addr);
1260
1261 read_lock_bh(&addrconf_hash_lock);
1262 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1263 if (ifp->idev->dev->nd_net != net)
1264 continue;
1265 if (ipv6_addr_equal(&ifp->addr, addr)) {
1266 if (dev == NULL || ifp->idev->dev == dev ||
1267 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1268 in6_ifa_hold(ifp);
1269 break;
1270 }
1271 }
1272 }
1273 read_unlock_bh(&addrconf_hash_lock);
1274
1275 return ifp;
1276 }
1277
1278 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1279 {
1280 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1281 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1282 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1283 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1284 int sk_ipv6only = ipv6_only_sock(sk);
1285 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1286 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1287 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1288
1289 if (!sk2_rcv_saddr && !sk_ipv6only)
1290 return 1;
1291
1292 if (addr_type2 == IPV6_ADDR_ANY &&
1293 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1294 return 1;
1295
1296 if (addr_type == IPV6_ADDR_ANY &&
1297 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1298 return 1;
1299
1300 if (sk2_rcv_saddr6 &&
1301 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1302 return 1;
1303
1304 if (addr_type == IPV6_ADDR_MAPPED &&
1305 !sk2_ipv6only &&
1306 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1307 return 1;
1308
1309 return 0;
1310 }
1311
1312 /* Gets referenced address, destroys ifaddr */
1313
1314 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1315 {
1316 if (ifp->flags&IFA_F_PERMANENT) {
1317 spin_lock_bh(&ifp->lock);
1318 addrconf_del_timer(ifp);
1319 ifp->flags |= IFA_F_TENTATIVE;
1320 spin_unlock_bh(&ifp->lock);
1321 in6_ifa_put(ifp);
1322 #ifdef CONFIG_IPV6_PRIVACY
1323 } else if (ifp->flags&IFA_F_TEMPORARY) {
1324 struct inet6_ifaddr *ifpub;
1325 spin_lock_bh(&ifp->lock);
1326 ifpub = ifp->ifpub;
1327 if (ifpub) {
1328 in6_ifa_hold(ifpub);
1329 spin_unlock_bh(&ifp->lock);
1330 ipv6_create_tempaddr(ifpub, ifp);
1331 in6_ifa_put(ifpub);
1332 } else {
1333 spin_unlock_bh(&ifp->lock);
1334 }
1335 ipv6_del_addr(ifp);
1336 #endif
1337 } else
1338 ipv6_del_addr(ifp);
1339 }
1340
1341 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1342 {
1343 if (net_ratelimit())
1344 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1345 addrconf_dad_stop(ifp);
1346 }
1347
1348 /* Join to solicited addr multicast group. */
1349
1350 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1351 {
1352 struct in6_addr maddr;
1353
1354 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1355 return;
1356
1357 addrconf_addr_solict_mult(addr, &maddr);
1358 ipv6_dev_mc_inc(dev, &maddr);
1359 }
1360
1361 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1362 {
1363 struct in6_addr maddr;
1364
1365 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1366 return;
1367
1368 addrconf_addr_solict_mult(addr, &maddr);
1369 __ipv6_dev_mc_dec(idev, &maddr);
1370 }
1371
1372 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1373 {
1374 struct in6_addr addr;
1375 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1376 if (ipv6_addr_any(&addr))
1377 return;
1378 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1379 }
1380
1381 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1382 {
1383 struct in6_addr addr;
1384 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1385 if (ipv6_addr_any(&addr))
1386 return;
1387 __ipv6_dev_ac_dec(ifp->idev, &addr);
1388 }
1389
1390 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1391 {
1392 if (dev->addr_len != ETH_ALEN)
1393 return -1;
1394 memcpy(eui, dev->dev_addr, 3);
1395 memcpy(eui + 5, dev->dev_addr + 3, 3);
1396
1397 /*
1398 * The zSeries OSA network cards can be shared among various
1399 * OS instances, but the OSA cards have only one MAC address.
1400 * This leads to duplicate address conflicts in conjunction
1401 * with IPv6 if more than one instance uses the same card.
1402 *
1403 * The driver for these cards can deliver a unique 16-bit
1404 * identifier for each instance sharing the same card. It is
1405 * placed instead of 0xFFFE in the interface identifier. The
1406 * "u" bit of the interface identifier is not inverted in this
1407 * case. Hence the resulting interface identifier has local
1408 * scope according to RFC2373.
1409 */
1410 if (dev->dev_id) {
1411 eui[3] = (dev->dev_id >> 8) & 0xFF;
1412 eui[4] = dev->dev_id & 0xFF;
1413 } else {
1414 eui[3] = 0xFF;
1415 eui[4] = 0xFE;
1416 eui[0] ^= 2;
1417 }
1418 return 0;
1419 }
1420
1421 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1422 {
1423 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1424 if (dev->addr_len != ARCNET_ALEN)
1425 return -1;
1426 memset(eui, 0, 7);
1427 eui[7] = *(u8*)dev->dev_addr;
1428 return 0;
1429 }
1430
1431 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1432 {
1433 if (dev->addr_len != INFINIBAND_ALEN)
1434 return -1;
1435 memcpy(eui, dev->dev_addr + 12, 8);
1436 eui[0] |= 2;
1437 return 0;
1438 }
1439
1440 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1441 {
1442 switch (dev->type) {
1443 case ARPHRD_ETHER:
1444 case ARPHRD_FDDI:
1445 case ARPHRD_IEEE802_TR:
1446 return addrconf_ifid_eui48(eui, dev);
1447 case ARPHRD_ARCNET:
1448 return addrconf_ifid_arcnet(eui, dev);
1449 case ARPHRD_INFINIBAND:
1450 return addrconf_ifid_infiniband(eui, dev);
1451 case ARPHRD_SIT:
1452 if (dev->priv_flags & IFF_ISATAP)
1453 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1454 }
1455 return -1;
1456 }
1457
1458 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1459 {
1460 int err = -1;
1461 struct inet6_ifaddr *ifp;
1462
1463 read_lock_bh(&idev->lock);
1464 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1465 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1466 memcpy(eui, ifp->addr.s6_addr+8, 8);
1467 err = 0;
1468 break;
1469 }
1470 }
1471 read_unlock_bh(&idev->lock);
1472 return err;
1473 }
1474
1475 #ifdef CONFIG_IPV6_PRIVACY
1476 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1477 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1478 {
1479 regen:
1480 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1481 idev->rndid[0] &= ~0x02;
1482
1483 /*
1484 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1485 * check if generated address is not inappropriate
1486 *
1487 * - Reserved subnet anycast (RFC 2526)
1488 * 11111101 11....11 1xxxxxxx
1489 * - ISATAP (RFC4214) 6.1
1490 * 00-00-5E-FE-xx-xx-xx-xx
1491 * - value 0
1492 * - XXX: already assigned to an address on the device
1493 */
1494 if (idev->rndid[0] == 0xfd &&
1495 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1496 (idev->rndid[7]&0x80))
1497 goto regen;
1498 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1499 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1500 goto regen;
1501 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1502 goto regen;
1503 }
1504
1505 return 0;
1506 }
1507
1508 static void ipv6_regen_rndid(unsigned long data)
1509 {
1510 struct inet6_dev *idev = (struct inet6_dev *) data;
1511 unsigned long expires;
1512
1513 rcu_read_lock_bh();
1514 write_lock_bh(&idev->lock);
1515
1516 if (idev->dead)
1517 goto out;
1518
1519 if (__ipv6_regen_rndid(idev) < 0)
1520 goto out;
1521
1522 expires = jiffies +
1523 idev->cnf.temp_prefered_lft * HZ -
1524 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1525 if (time_before(expires, jiffies)) {
1526 printk(KERN_WARNING
1527 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1528 idev->dev->name);
1529 goto out;
1530 }
1531
1532 if (!mod_timer(&idev->regen_timer, expires))
1533 in6_dev_hold(idev);
1534
1535 out:
1536 write_unlock_bh(&idev->lock);
1537 rcu_read_unlock_bh();
1538 in6_dev_put(idev);
1539 }
1540
1541 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1542 int ret = 0;
1543
1544 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1545 ret = __ipv6_regen_rndid(idev);
1546 return ret;
1547 }
1548 #endif
1549
1550 /*
1551 * Add prefix route.
1552 */
1553
1554 static void
1555 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1556 unsigned long expires, u32 flags)
1557 {
1558 struct fib6_config cfg = {
1559 .fc_table = RT6_TABLE_PREFIX,
1560 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1561 .fc_ifindex = dev->ifindex,
1562 .fc_expires = expires,
1563 .fc_dst_len = plen,
1564 .fc_flags = RTF_UP | flags,
1565 .fc_nlinfo.nl_net = &init_net,
1566 };
1567
1568 ipv6_addr_copy(&cfg.fc_dst, pfx);
1569
1570 /* Prevent useless cloning on PtP SIT.
1571 This thing is done here expecting that the whole
1572 class of non-broadcast devices need not cloning.
1573 */
1574 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1575 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1576 cfg.fc_flags |= RTF_NONEXTHOP;
1577 #endif
1578
1579 ip6_route_add(&cfg);
1580 }
1581
1582 /* Create "default" multicast route to the interface */
1583
1584 static void addrconf_add_mroute(struct net_device *dev)
1585 {
1586 struct fib6_config cfg = {
1587 .fc_table = RT6_TABLE_LOCAL,
1588 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1589 .fc_ifindex = dev->ifindex,
1590 .fc_dst_len = 8,
1591 .fc_flags = RTF_UP,
1592 .fc_nlinfo.nl_net = &init_net,
1593 };
1594
1595 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1596
1597 ip6_route_add(&cfg);
1598 }
1599
1600 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1601 static void sit_route_add(struct net_device *dev)
1602 {
1603 struct fib6_config cfg = {
1604 .fc_table = RT6_TABLE_MAIN,
1605 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1606 .fc_ifindex = dev->ifindex,
1607 .fc_dst_len = 96,
1608 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1609 .fc_nlinfo.nl_net = &init_net,
1610 };
1611
1612 /* prefix length - 96 bits "::d.d.d.d" */
1613 ip6_route_add(&cfg);
1614 }
1615 #endif
1616
1617 static void addrconf_add_lroute(struct net_device *dev)
1618 {
1619 struct in6_addr addr;
1620
1621 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1622 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1623 }
1624
1625 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1626 {
1627 struct inet6_dev *idev;
1628
1629 ASSERT_RTNL();
1630
1631 if ((idev = ipv6_find_idev(dev)) == NULL)
1632 return NULL;
1633
1634 /* Add default multicast route */
1635 addrconf_add_mroute(dev);
1636
1637 /* Add link local route */
1638 addrconf_add_lroute(dev);
1639 return idev;
1640 }
1641
1642 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1643 {
1644 struct prefix_info *pinfo;
1645 __u32 valid_lft;
1646 __u32 prefered_lft;
1647 int addr_type;
1648 unsigned long rt_expires;
1649 struct inet6_dev *in6_dev;
1650
1651 pinfo = (struct prefix_info *) opt;
1652
1653 if (len < sizeof(struct prefix_info)) {
1654 ADBG(("addrconf: prefix option too short\n"));
1655 return;
1656 }
1657
1658 /*
1659 * Validation checks ([ADDRCONF], page 19)
1660 */
1661
1662 addr_type = ipv6_addr_type(&pinfo->prefix);
1663
1664 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1665 return;
1666
1667 valid_lft = ntohl(pinfo->valid);
1668 prefered_lft = ntohl(pinfo->prefered);
1669
1670 if (prefered_lft > valid_lft) {
1671 if (net_ratelimit())
1672 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1673 return;
1674 }
1675
1676 in6_dev = in6_dev_get(dev);
1677
1678 if (in6_dev == NULL) {
1679 if (net_ratelimit())
1680 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1681 return;
1682 }
1683
1684 /*
1685 * Two things going on here:
1686 * 1) Add routes for on-link prefixes
1687 * 2) Configure prefixes with the auto flag set
1688 */
1689
1690 /* Avoid arithmetic overflow. Really, we could
1691 save rt_expires in seconds, likely valid_lft,
1692 but it would require division in fib gc, that it
1693 not good.
1694 */
1695 if (valid_lft >= 0x7FFFFFFF/HZ)
1696 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1697 else
1698 rt_expires = valid_lft * HZ;
1699
1700 /*
1701 * We convert this (in jiffies) to clock_t later.
1702 * Avoid arithmetic overflow there as well.
1703 * Overflow can happen only if HZ < USER_HZ.
1704 */
1705 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1706 rt_expires = 0x7FFFFFFF / USER_HZ;
1707
1708 if (pinfo->onlink) {
1709 struct rt6_info *rt;
1710 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1711
1712 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1713 if (rt->rt6i_flags&RTF_EXPIRES) {
1714 if (valid_lft == 0) {
1715 ip6_del_rt(rt);
1716 rt = NULL;
1717 } else {
1718 rt->rt6i_expires = jiffies + rt_expires;
1719 }
1720 }
1721 } else if (valid_lft) {
1722 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1723 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1724 }
1725 if (rt)
1726 dst_release(&rt->u.dst);
1727 }
1728
1729 /* Try to figure out our local address for this prefix */
1730
1731 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1732 struct inet6_ifaddr * ifp;
1733 struct in6_addr addr;
1734 int create = 0, update_lft = 0;
1735
1736 if (pinfo->prefix_len == 64) {
1737 memcpy(&addr, &pinfo->prefix, 8);
1738 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1739 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1740 in6_dev_put(in6_dev);
1741 return;
1742 }
1743 goto ok;
1744 }
1745 if (net_ratelimit())
1746 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1747 pinfo->prefix_len);
1748 in6_dev_put(in6_dev);
1749 return;
1750
1751 ok:
1752
1753 ifp = ipv6_get_ifaddr(&init_net, &addr, dev, 1);
1754
1755 if (ifp == NULL && valid_lft) {
1756 int max_addresses = in6_dev->cnf.max_addresses;
1757 u32 addr_flags = 0;
1758
1759 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1760 if (in6_dev->cnf.optimistic_dad &&
1761 !ipv6_devconf.forwarding)
1762 addr_flags = IFA_F_OPTIMISTIC;
1763 #endif
1764
1765 /* Do not allow to create too much of autoconfigured
1766 * addresses; this would be too easy way to crash kernel.
1767 */
1768 if (!max_addresses ||
1769 ipv6_count_addresses(in6_dev) < max_addresses)
1770 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1771 addr_type&IPV6_ADDR_SCOPE_MASK,
1772 addr_flags);
1773
1774 if (!ifp || IS_ERR(ifp)) {
1775 in6_dev_put(in6_dev);
1776 return;
1777 }
1778
1779 update_lft = create = 1;
1780 ifp->cstamp = jiffies;
1781 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1782 }
1783
1784 if (ifp) {
1785 int flags;
1786 unsigned long now;
1787 #ifdef CONFIG_IPV6_PRIVACY
1788 struct inet6_ifaddr *ift;
1789 #endif
1790 u32 stored_lft;
1791
1792 /* update lifetime (RFC2462 5.5.3 e) */
1793 spin_lock(&ifp->lock);
1794 now = jiffies;
1795 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1796 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1797 else
1798 stored_lft = 0;
1799 if (!update_lft && stored_lft) {
1800 if (valid_lft > MIN_VALID_LIFETIME ||
1801 valid_lft > stored_lft)
1802 update_lft = 1;
1803 else if (stored_lft <= MIN_VALID_LIFETIME) {
1804 /* valid_lft <= stored_lft is always true */
1805 /* XXX: IPsec */
1806 update_lft = 0;
1807 } else {
1808 valid_lft = MIN_VALID_LIFETIME;
1809 if (valid_lft < prefered_lft)
1810 prefered_lft = valid_lft;
1811 update_lft = 1;
1812 }
1813 }
1814
1815 if (update_lft) {
1816 ifp->valid_lft = valid_lft;
1817 ifp->prefered_lft = prefered_lft;
1818 ifp->tstamp = now;
1819 flags = ifp->flags;
1820 ifp->flags &= ~IFA_F_DEPRECATED;
1821 spin_unlock(&ifp->lock);
1822
1823 if (!(flags&IFA_F_TENTATIVE))
1824 ipv6_ifa_notify(0, ifp);
1825 } else
1826 spin_unlock(&ifp->lock);
1827
1828 #ifdef CONFIG_IPV6_PRIVACY
1829 read_lock_bh(&in6_dev->lock);
1830 /* update all temporary addresses in the list */
1831 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1832 /*
1833 * When adjusting the lifetimes of an existing
1834 * temporary address, only lower the lifetimes.
1835 * Implementations must not increase the
1836 * lifetimes of an existing temporary address
1837 * when processing a Prefix Information Option.
1838 */
1839 spin_lock(&ift->lock);
1840 flags = ift->flags;
1841 if (ift->valid_lft > valid_lft &&
1842 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1843 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1844 if (ift->prefered_lft > prefered_lft &&
1845 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1846 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1847 spin_unlock(&ift->lock);
1848 if (!(flags&IFA_F_TENTATIVE))
1849 ipv6_ifa_notify(0, ift);
1850 }
1851
1852 if (create && in6_dev->cnf.use_tempaddr > 0) {
1853 /*
1854 * When a new public address is created as described in [ADDRCONF],
1855 * also create a new temporary address.
1856 */
1857 read_unlock_bh(&in6_dev->lock);
1858 ipv6_create_tempaddr(ifp, NULL);
1859 } else {
1860 read_unlock_bh(&in6_dev->lock);
1861 }
1862 #endif
1863 in6_ifa_put(ifp);
1864 addrconf_verify(0);
1865 }
1866 }
1867 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1868 in6_dev_put(in6_dev);
1869 }
1870
1871 /*
1872 * Set destination address.
1873 * Special case for SIT interfaces where we create a new "virtual"
1874 * device.
1875 */
1876 int addrconf_set_dstaddr(void __user *arg)
1877 {
1878 struct in6_ifreq ireq;
1879 struct net_device *dev;
1880 int err = -EINVAL;
1881
1882 rtnl_lock();
1883
1884 err = -EFAULT;
1885 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1886 goto err_exit;
1887
1888 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1889
1890 err = -ENODEV;
1891 if (dev == NULL)
1892 goto err_exit;
1893
1894 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1895 if (dev->type == ARPHRD_SIT) {
1896 struct ifreq ifr;
1897 mm_segment_t oldfs;
1898 struct ip_tunnel_parm p;
1899
1900 err = -EADDRNOTAVAIL;
1901 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1902 goto err_exit;
1903
1904 memset(&p, 0, sizeof(p));
1905 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1906 p.iph.saddr = 0;
1907 p.iph.version = 4;
1908 p.iph.ihl = 5;
1909 p.iph.protocol = IPPROTO_IPV6;
1910 p.iph.ttl = 64;
1911 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1912
1913 oldfs = get_fs(); set_fs(KERNEL_DS);
1914 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1915 set_fs(oldfs);
1916
1917 if (err == 0) {
1918 err = -ENOBUFS;
1919 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1920 goto err_exit;
1921 err = dev_open(dev);
1922 }
1923 }
1924 #endif
1925
1926 err_exit:
1927 rtnl_unlock();
1928 return err;
1929 }
1930
1931 /*
1932 * Manual configuration of address on an interface
1933 */
1934 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1935 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1936 {
1937 struct inet6_ifaddr *ifp;
1938 struct inet6_dev *idev;
1939 struct net_device *dev;
1940 int scope;
1941 u32 flags = RTF_EXPIRES;
1942
1943 ASSERT_RTNL();
1944
1945 /* check the lifetime */
1946 if (!valid_lft || prefered_lft > valid_lft)
1947 return -EINVAL;
1948
1949 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1950 return -ENODEV;
1951
1952 if ((idev = addrconf_add_dev(dev)) == NULL)
1953 return -ENOBUFS;
1954
1955 scope = ipv6_addr_scope(pfx);
1956
1957 if (valid_lft == INFINITY_LIFE_TIME) {
1958 ifa_flags |= IFA_F_PERMANENT;
1959 flags = 0;
1960 } else if (valid_lft >= 0x7FFFFFFF/HZ)
1961 valid_lft = 0x7FFFFFFF/HZ;
1962
1963 if (prefered_lft == 0)
1964 ifa_flags |= IFA_F_DEPRECATED;
1965 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1966 (prefered_lft != INFINITY_LIFE_TIME))
1967 prefered_lft = 0x7FFFFFFF/HZ;
1968
1969 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1970
1971 if (!IS_ERR(ifp)) {
1972 spin_lock_bh(&ifp->lock);
1973 ifp->valid_lft = valid_lft;
1974 ifp->prefered_lft = prefered_lft;
1975 ifp->tstamp = jiffies;
1976 spin_unlock_bh(&ifp->lock);
1977
1978 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1979 jiffies_to_clock_t(valid_lft * HZ), flags);
1980 /*
1981 * Note that section 3.1 of RFC 4429 indicates
1982 * that the Optimistic flag should not be set for
1983 * manually configured addresses
1984 */
1985 addrconf_dad_start(ifp, 0);
1986 in6_ifa_put(ifp);
1987 addrconf_verify(0);
1988 return 0;
1989 }
1990
1991 return PTR_ERR(ifp);
1992 }
1993
1994 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1995 {
1996 struct inet6_ifaddr *ifp;
1997 struct inet6_dev *idev;
1998 struct net_device *dev;
1999
2000 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
2001 return -ENODEV;
2002
2003 if ((idev = __in6_dev_get(dev)) == NULL)
2004 return -ENXIO;
2005
2006 read_lock_bh(&idev->lock);
2007 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2008 if (ifp->prefix_len == plen &&
2009 ipv6_addr_equal(pfx, &ifp->addr)) {
2010 in6_ifa_hold(ifp);
2011 read_unlock_bh(&idev->lock);
2012
2013 ipv6_del_addr(ifp);
2014
2015 /* If the last address is deleted administratively,
2016 disable IPv6 on this interface.
2017 */
2018 if (idev->addr_list == NULL)
2019 addrconf_ifdown(idev->dev, 1);
2020 return 0;
2021 }
2022 }
2023 read_unlock_bh(&idev->lock);
2024 return -EADDRNOTAVAIL;
2025 }
2026
2027
2028 int addrconf_add_ifaddr(void __user *arg)
2029 {
2030 struct in6_ifreq ireq;
2031 int err;
2032
2033 if (!capable(CAP_NET_ADMIN))
2034 return -EPERM;
2035
2036 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2037 return -EFAULT;
2038
2039 rtnl_lock();
2040 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2041 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2042 rtnl_unlock();
2043 return err;
2044 }
2045
2046 int addrconf_del_ifaddr(void __user *arg)
2047 {
2048 struct in6_ifreq ireq;
2049 int err;
2050
2051 if (!capable(CAP_NET_ADMIN))
2052 return -EPERM;
2053
2054 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2055 return -EFAULT;
2056
2057 rtnl_lock();
2058 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2059 rtnl_unlock();
2060 return err;
2061 }
2062
2063 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2064 static void sit_add_v4_addrs(struct inet6_dev *idev)
2065 {
2066 struct inet6_ifaddr * ifp;
2067 struct in6_addr addr;
2068 struct net_device *dev;
2069 int scope;
2070
2071 ASSERT_RTNL();
2072
2073 memset(&addr, 0, sizeof(struct in6_addr));
2074 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2075
2076 if (idev->dev->flags&IFF_POINTOPOINT) {
2077 addr.s6_addr32[0] = htonl(0xfe800000);
2078 scope = IFA_LINK;
2079 } else {
2080 scope = IPV6_ADDR_COMPATv4;
2081 }
2082
2083 if (addr.s6_addr32[3]) {
2084 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2085 if (!IS_ERR(ifp)) {
2086 spin_lock_bh(&ifp->lock);
2087 ifp->flags &= ~IFA_F_TENTATIVE;
2088 spin_unlock_bh(&ifp->lock);
2089 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2090 in6_ifa_put(ifp);
2091 }
2092 return;
2093 }
2094
2095 for_each_netdev(&init_net, dev) {
2096 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2097 if (in_dev && (dev->flags & IFF_UP)) {
2098 struct in_ifaddr * ifa;
2099
2100 int flag = scope;
2101
2102 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2103 int plen;
2104
2105 addr.s6_addr32[3] = ifa->ifa_local;
2106
2107 if (ifa->ifa_scope == RT_SCOPE_LINK)
2108 continue;
2109 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2110 if (idev->dev->flags&IFF_POINTOPOINT)
2111 continue;
2112 flag |= IFA_HOST;
2113 }
2114 if (idev->dev->flags&IFF_POINTOPOINT)
2115 plen = 64;
2116 else
2117 plen = 96;
2118
2119 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2120 IFA_F_PERMANENT);
2121 if (!IS_ERR(ifp)) {
2122 spin_lock_bh(&ifp->lock);
2123 ifp->flags &= ~IFA_F_TENTATIVE;
2124 spin_unlock_bh(&ifp->lock);
2125 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2126 in6_ifa_put(ifp);
2127 }
2128 }
2129 }
2130 }
2131 }
2132 #endif
2133
2134 static void init_loopback(struct net_device *dev)
2135 {
2136 struct inet6_dev *idev;
2137 struct inet6_ifaddr * ifp;
2138
2139 /* ::1 */
2140
2141 ASSERT_RTNL();
2142
2143 if ((idev = ipv6_find_idev(dev)) == NULL) {
2144 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2145 return;
2146 }
2147
2148 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2149 if (!IS_ERR(ifp)) {
2150 spin_lock_bh(&ifp->lock);
2151 ifp->flags &= ~IFA_F_TENTATIVE;
2152 spin_unlock_bh(&ifp->lock);
2153 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2154 in6_ifa_put(ifp);
2155 }
2156 }
2157
2158 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2159 {
2160 struct inet6_ifaddr * ifp;
2161 u32 addr_flags = IFA_F_PERMANENT;
2162
2163 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2164 if (idev->cnf.optimistic_dad &&
2165 !ipv6_devconf.forwarding)
2166 addr_flags |= IFA_F_OPTIMISTIC;
2167 #endif
2168
2169
2170 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2171 if (!IS_ERR(ifp)) {
2172 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2173 addrconf_dad_start(ifp, 0);
2174 in6_ifa_put(ifp);
2175 }
2176 }
2177
2178 static void addrconf_dev_config(struct net_device *dev)
2179 {
2180 struct in6_addr addr;
2181 struct inet6_dev * idev;
2182
2183 ASSERT_RTNL();
2184
2185 if ((dev->type != ARPHRD_ETHER) &&
2186 (dev->type != ARPHRD_FDDI) &&
2187 (dev->type != ARPHRD_IEEE802_TR) &&
2188 (dev->type != ARPHRD_ARCNET) &&
2189 (dev->type != ARPHRD_INFINIBAND)) {
2190 /* Alas, we support only Ethernet autoconfiguration. */
2191 return;
2192 }
2193
2194 idev = addrconf_add_dev(dev);
2195 if (idev == NULL)
2196 return;
2197
2198 memset(&addr, 0, sizeof(struct in6_addr));
2199 addr.s6_addr32[0] = htonl(0xFE800000);
2200
2201 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2202 addrconf_add_linklocal(idev, &addr);
2203 }
2204
2205 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2206 static void addrconf_sit_config(struct net_device *dev)
2207 {
2208 struct inet6_dev *idev;
2209
2210 ASSERT_RTNL();
2211
2212 /*
2213 * Configure the tunnel with one of our IPv4
2214 * addresses... we should configure all of
2215 * our v4 addrs in the tunnel
2216 */
2217
2218 if ((idev = ipv6_find_idev(dev)) == NULL) {
2219 printk(KERN_DEBUG "init sit: add_dev failed\n");
2220 return;
2221 }
2222
2223 if (dev->priv_flags & IFF_ISATAP) {
2224 struct in6_addr addr;
2225
2226 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2227 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2228 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2229 addrconf_add_linklocal(idev, &addr);
2230 return;
2231 }
2232
2233 sit_add_v4_addrs(idev);
2234
2235 if (dev->flags&IFF_POINTOPOINT) {
2236 addrconf_add_mroute(dev);
2237 addrconf_add_lroute(dev);
2238 } else
2239 sit_route_add(dev);
2240 }
2241 #endif
2242
2243 static inline int
2244 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2245 {
2246 struct in6_addr lladdr;
2247
2248 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2249 addrconf_add_linklocal(idev, &lladdr);
2250 return 0;
2251 }
2252 return -1;
2253 }
2254
2255 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2256 {
2257 struct net_device *link_dev;
2258
2259 /* first try to inherit the link-local address from the link device */
2260 if (idev->dev->iflink &&
2261 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2262 if (!ipv6_inherit_linklocal(idev, link_dev))
2263 return;
2264 }
2265 /* then try to inherit it from any device */
2266 for_each_netdev(&init_net, link_dev) {
2267 if (!ipv6_inherit_linklocal(idev, link_dev))
2268 return;
2269 }
2270 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2271 }
2272
2273 /*
2274 * Autoconfigure tunnel with a link-local address so routing protocols,
2275 * DHCPv6, MLD etc. can be run over the virtual link
2276 */
2277
2278 static void addrconf_ip6_tnl_config(struct net_device *dev)
2279 {
2280 struct inet6_dev *idev;
2281
2282 ASSERT_RTNL();
2283
2284 if ((idev = addrconf_add_dev(dev)) == NULL) {
2285 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2286 return;
2287 }
2288 ip6_tnl_add_linklocal(idev);
2289 }
2290
2291 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2292 void * data)
2293 {
2294 struct net_device *dev = (struct net_device *) data;
2295 struct inet6_dev *idev = __in6_dev_get(dev);
2296 int run_pending = 0;
2297 int err;
2298
2299 if (dev->nd_net != &init_net)
2300 return NOTIFY_DONE;
2301
2302 switch(event) {
2303 case NETDEV_REGISTER:
2304 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2305 idev = ipv6_add_dev(dev);
2306 if (!idev)
2307 return notifier_from_errno(-ENOMEM);
2308 }
2309 break;
2310 case NETDEV_UP:
2311 case NETDEV_CHANGE:
2312 if (dev->flags & IFF_SLAVE)
2313 break;
2314
2315 if (event == NETDEV_UP) {
2316 if (!addrconf_qdisc_ok(dev)) {
2317 /* device is not ready yet. */
2318 printk(KERN_INFO
2319 "ADDRCONF(NETDEV_UP): %s: "
2320 "link is not ready\n",
2321 dev->name);
2322 break;
2323 }
2324
2325 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2326 idev = ipv6_add_dev(dev);
2327
2328 if (idev)
2329 idev->if_flags |= IF_READY;
2330 } else {
2331 if (!addrconf_qdisc_ok(dev)) {
2332 /* device is still not ready. */
2333 break;
2334 }
2335
2336 if (idev) {
2337 if (idev->if_flags & IF_READY) {
2338 /* device is already configured. */
2339 break;
2340 }
2341 idev->if_flags |= IF_READY;
2342 }
2343
2344 printk(KERN_INFO
2345 "ADDRCONF(NETDEV_CHANGE): %s: "
2346 "link becomes ready\n",
2347 dev->name);
2348
2349 run_pending = 1;
2350 }
2351
2352 switch(dev->type) {
2353 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2354 case ARPHRD_SIT:
2355 addrconf_sit_config(dev);
2356 break;
2357 #endif
2358 case ARPHRD_TUNNEL6:
2359 addrconf_ip6_tnl_config(dev);
2360 break;
2361 case ARPHRD_LOOPBACK:
2362 init_loopback(dev);
2363 break;
2364
2365 default:
2366 addrconf_dev_config(dev);
2367 break;
2368 }
2369 if (idev) {
2370 if (run_pending)
2371 addrconf_dad_run(idev);
2372
2373 /* If the MTU changed during the interface down, when the
2374 interface up, the changed MTU must be reflected in the
2375 idev as well as routers.
2376 */
2377 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2378 rt6_mtu_change(dev, dev->mtu);
2379 idev->cnf.mtu6 = dev->mtu;
2380 }
2381 idev->tstamp = jiffies;
2382 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2383 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2384 stop IPv6 on this interface.
2385 */
2386 if (dev->mtu < IPV6_MIN_MTU)
2387 addrconf_ifdown(dev, event != NETDEV_DOWN);
2388 }
2389 break;
2390
2391 case NETDEV_CHANGEMTU:
2392 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2393 rt6_mtu_change(dev, dev->mtu);
2394 idev->cnf.mtu6 = dev->mtu;
2395 break;
2396 }
2397
2398 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2399 idev = ipv6_add_dev(dev);
2400 if (idev)
2401 break;
2402 }
2403
2404 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2405
2406 case NETDEV_DOWN:
2407 case NETDEV_UNREGISTER:
2408 /*
2409 * Remove all addresses from this interface.
2410 */
2411 addrconf_ifdown(dev, event != NETDEV_DOWN);
2412 break;
2413
2414 case NETDEV_CHANGENAME:
2415 if (idev) {
2416 snmp6_unregister_dev(idev);
2417 addrconf_sysctl_unregister(idev);
2418 addrconf_sysctl_register(idev);
2419 err = snmp6_register_dev(idev);
2420 if (err)
2421 return notifier_from_errno(err);
2422 }
2423 break;
2424 }
2425
2426 return NOTIFY_OK;
2427 }
2428
2429 /*
2430 * addrconf module should be notified of a device going up
2431 */
2432 static struct notifier_block ipv6_dev_notf = {
2433 .notifier_call = addrconf_notify,
2434 .priority = 0
2435 };
2436
2437 static int addrconf_ifdown(struct net_device *dev, int how)
2438 {
2439 struct inet6_dev *idev;
2440 struct inet6_ifaddr *ifa, **bifa;
2441 int i;
2442
2443 ASSERT_RTNL();
2444
2445 if (dev == init_net.loopback_dev && how == 1)
2446 how = 0;
2447
2448 rt6_ifdown(dev);
2449 neigh_ifdown(&nd_tbl, dev);
2450
2451 idev = __in6_dev_get(dev);
2452 if (idev == NULL)
2453 return -ENODEV;
2454
2455 /* Step 1: remove reference to ipv6 device from parent device.
2456 Do not dev_put!
2457 */
2458 if (how == 1) {
2459 idev->dead = 1;
2460
2461 /* protected by rtnl_lock */
2462 rcu_assign_pointer(dev->ip6_ptr, NULL);
2463
2464 /* Step 1.5: remove snmp6 entry */
2465 snmp6_unregister_dev(idev);
2466
2467 }
2468
2469 /* Step 2: clear hash table */
2470 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2471 bifa = &inet6_addr_lst[i];
2472
2473 write_lock_bh(&addrconf_hash_lock);
2474 while ((ifa = *bifa) != NULL) {
2475 if (ifa->idev == idev) {
2476 *bifa = ifa->lst_next;
2477 ifa->lst_next = NULL;
2478 addrconf_del_timer(ifa);
2479 in6_ifa_put(ifa);
2480 continue;
2481 }
2482 bifa = &ifa->lst_next;
2483 }
2484 write_unlock_bh(&addrconf_hash_lock);
2485 }
2486
2487 write_lock_bh(&idev->lock);
2488
2489 /* Step 3: clear flags for stateless addrconf */
2490 if (how != 1)
2491 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2492
2493 /* Step 4: clear address list */
2494 #ifdef CONFIG_IPV6_PRIVACY
2495 if (how == 1 && del_timer(&idev->regen_timer))
2496 in6_dev_put(idev);
2497
2498 /* clear tempaddr list */
2499 while ((ifa = idev->tempaddr_list) != NULL) {
2500 idev->tempaddr_list = ifa->tmp_next;
2501 ifa->tmp_next = NULL;
2502 ifa->dead = 1;
2503 write_unlock_bh(&idev->lock);
2504 spin_lock_bh(&ifa->lock);
2505
2506 if (ifa->ifpub) {
2507 in6_ifa_put(ifa->ifpub);
2508 ifa->ifpub = NULL;
2509 }
2510 spin_unlock_bh(&ifa->lock);
2511 in6_ifa_put(ifa);
2512 write_lock_bh(&idev->lock);
2513 }
2514 #endif
2515 while ((ifa = idev->addr_list) != NULL) {
2516 idev->addr_list = ifa->if_next;
2517 ifa->if_next = NULL;
2518 ifa->dead = 1;
2519 addrconf_del_timer(ifa);
2520 write_unlock_bh(&idev->lock);
2521
2522 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2523 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2524 in6_ifa_put(ifa);
2525
2526 write_lock_bh(&idev->lock);
2527 }
2528 write_unlock_bh(&idev->lock);
2529
2530 /* Step 5: Discard multicast list */
2531
2532 if (how == 1)
2533 ipv6_mc_destroy_dev(idev);
2534 else
2535 ipv6_mc_down(idev);
2536
2537 idev->tstamp = jiffies;
2538
2539 /* Shot the device (if unregistered) */
2540
2541 if (how == 1) {
2542 addrconf_sysctl_unregister(idev);
2543 neigh_parms_release(&nd_tbl, idev->nd_parms);
2544 neigh_ifdown(&nd_tbl, dev);
2545 in6_dev_put(idev);
2546 }
2547 return 0;
2548 }
2549
2550 static void addrconf_rs_timer(unsigned long data)
2551 {
2552 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2553
2554 if (ifp->idev->cnf.forwarding)
2555 goto out;
2556
2557 if (ifp->idev->if_flags & IF_RA_RCVD) {
2558 /*
2559 * Announcement received after solicitation
2560 * was sent
2561 */
2562 goto out;
2563 }
2564
2565 spin_lock(&ifp->lock);
2566 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2567 struct in6_addr all_routers;
2568
2569 /* The wait after the last probe can be shorter */
2570 addrconf_mod_timer(ifp, AC_RS,
2571 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2572 ifp->idev->cnf.rtr_solicit_delay :
2573 ifp->idev->cnf.rtr_solicit_interval);
2574 spin_unlock(&ifp->lock);
2575
2576 ipv6_addr_all_routers(&all_routers);
2577
2578 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2579 } else {
2580 spin_unlock(&ifp->lock);
2581 /*
2582 * Note: we do not support deprecated "all on-link"
2583 * assumption any longer.
2584 */
2585 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2586 ifp->idev->dev->name);
2587 }
2588
2589 out:
2590 in6_ifa_put(ifp);
2591 }
2592
2593 /*
2594 * Duplicate Address Detection
2595 */
2596 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2597 {
2598 unsigned long rand_num;
2599 struct inet6_dev *idev = ifp->idev;
2600
2601 if (ifp->flags & IFA_F_OPTIMISTIC)
2602 rand_num = 0;
2603 else
2604 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2605
2606 ifp->probes = idev->cnf.dad_transmits;
2607 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2608 }
2609
2610 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2611 {
2612 struct inet6_dev *idev = ifp->idev;
2613 struct net_device *dev = idev->dev;
2614
2615 addrconf_join_solict(dev, &ifp->addr);
2616
2617 net_srandom(ifp->addr.s6_addr32[3]);
2618
2619 read_lock_bh(&idev->lock);
2620 if (ifp->dead)
2621 goto out;
2622 spin_lock_bh(&ifp->lock);
2623
2624 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2625 !(ifp->flags&IFA_F_TENTATIVE) ||
2626 ifp->flags & IFA_F_NODAD) {
2627 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2628 spin_unlock_bh(&ifp->lock);
2629 read_unlock_bh(&idev->lock);
2630
2631 addrconf_dad_completed(ifp);
2632 return;
2633 }
2634
2635 if (!(idev->if_flags & IF_READY)) {
2636 spin_unlock_bh(&ifp->lock);
2637 read_unlock_bh(&idev->lock);
2638 /*
2639 * If the defice is not ready:
2640 * - keep it tentative if it is a permanent address.
2641 * - otherwise, kill it.
2642 */
2643 in6_ifa_hold(ifp);
2644 addrconf_dad_stop(ifp);
2645 return;
2646 }
2647
2648 /*
2649 * Optimistic nodes can start receiving
2650 * Frames right away
2651 */
2652 if(ifp->flags & IFA_F_OPTIMISTIC)
2653 ip6_ins_rt(ifp->rt);
2654
2655 addrconf_dad_kick(ifp);
2656 spin_unlock_bh(&ifp->lock);
2657 out:
2658 read_unlock_bh(&idev->lock);
2659 }
2660
2661 static void addrconf_dad_timer(unsigned long data)
2662 {
2663 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2664 struct inet6_dev *idev = ifp->idev;
2665 struct in6_addr unspec;
2666 struct in6_addr mcaddr;
2667
2668 read_lock_bh(&idev->lock);
2669 if (idev->dead) {
2670 read_unlock_bh(&idev->lock);
2671 goto out;
2672 }
2673 spin_lock_bh(&ifp->lock);
2674 if (ifp->probes == 0) {
2675 /*
2676 * DAD was successful
2677 */
2678
2679 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2680 spin_unlock_bh(&ifp->lock);
2681 read_unlock_bh(&idev->lock);
2682
2683 addrconf_dad_completed(ifp);
2684
2685 goto out;
2686 }
2687
2688 ifp->probes--;
2689 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2690 spin_unlock_bh(&ifp->lock);
2691 read_unlock_bh(&idev->lock);
2692
2693 /* send a neighbour solicitation for our addr */
2694 memset(&unspec, 0, sizeof(unspec));
2695 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2696 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2697 out:
2698 in6_ifa_put(ifp);
2699 }
2700
2701 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2702 {
2703 struct net_device * dev = ifp->idev->dev;
2704
2705 /*
2706 * Configure the address for reception. Now it is valid.
2707 */
2708
2709 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2710
2711 /* If added prefix is link local and forwarding is off,
2712 start sending router solicitations.
2713 */
2714
2715 if (ifp->idev->cnf.forwarding == 0 &&
2716 ifp->idev->cnf.rtr_solicits > 0 &&
2717 (dev->flags&IFF_LOOPBACK) == 0 &&
2718 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2719 struct in6_addr all_routers;
2720
2721 ipv6_addr_all_routers(&all_routers);
2722
2723 /*
2724 * If a host as already performed a random delay
2725 * [...] as part of DAD [...] there is no need
2726 * to delay again before sending the first RS
2727 */
2728 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2729
2730 spin_lock_bh(&ifp->lock);
2731 ifp->probes = 1;
2732 ifp->idev->if_flags |= IF_RS_SENT;
2733 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2734 spin_unlock_bh(&ifp->lock);
2735 }
2736 }
2737
2738 static void addrconf_dad_run(struct inet6_dev *idev) {
2739 struct inet6_ifaddr *ifp;
2740
2741 read_lock_bh(&idev->lock);
2742 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2743 spin_lock_bh(&ifp->lock);
2744 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2745 spin_unlock_bh(&ifp->lock);
2746 continue;
2747 }
2748 spin_unlock_bh(&ifp->lock);
2749 addrconf_dad_kick(ifp);
2750 }
2751 read_unlock_bh(&idev->lock);
2752 }
2753
2754 #ifdef CONFIG_PROC_FS
2755 struct if6_iter_state {
2756 struct seq_net_private p;
2757 int bucket;
2758 };
2759
2760 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2761 {
2762 struct inet6_ifaddr *ifa = NULL;
2763 struct if6_iter_state *state = seq->private;
2764 struct net *net = state->p.net;
2765
2766 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2767 ifa = inet6_addr_lst[state->bucket];
2768
2769 while (ifa && ifa->idev->dev->nd_net != net)
2770 ifa = ifa->lst_next;
2771 if (ifa)
2772 break;
2773 }
2774 return ifa;
2775 }
2776
2777 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2778 {
2779 struct if6_iter_state *state = seq->private;
2780 struct net *net = state->p.net;
2781
2782 ifa = ifa->lst_next;
2783 try_again:
2784 if (ifa) {
2785 if (ifa->idev->dev->nd_net != net) {
2786 ifa = ifa->lst_next;
2787 goto try_again;
2788 }
2789 }
2790
2791 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2792 ifa = inet6_addr_lst[state->bucket];
2793 goto try_again;
2794 }
2795
2796 return ifa;
2797 }
2798
2799 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2800 {
2801 struct inet6_ifaddr *ifa = if6_get_first(seq);
2802
2803 if (ifa)
2804 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2805 --pos;
2806 return pos ? NULL : ifa;
2807 }
2808
2809 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2810 __acquires(addrconf_hash_lock)
2811 {
2812 read_lock_bh(&addrconf_hash_lock);
2813 return if6_get_idx(seq, *pos);
2814 }
2815
2816 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2817 {
2818 struct inet6_ifaddr *ifa;
2819
2820 ifa = if6_get_next(seq, v);
2821 ++*pos;
2822 return ifa;
2823 }
2824
2825 static void if6_seq_stop(struct seq_file *seq, void *v)
2826 __releases(addrconf_hash_lock)
2827 {
2828 read_unlock_bh(&addrconf_hash_lock);
2829 }
2830
2831 static int if6_seq_show(struct seq_file *seq, void *v)
2832 {
2833 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2834 seq_printf(seq,
2835 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2836 NIP6(ifp->addr),
2837 ifp->idev->dev->ifindex,
2838 ifp->prefix_len,
2839 ifp->scope,
2840 ifp->flags,
2841 ifp->idev->dev->name);
2842 return 0;
2843 }
2844
2845 static const struct seq_operations if6_seq_ops = {
2846 .start = if6_seq_start,
2847 .next = if6_seq_next,
2848 .show = if6_seq_show,
2849 .stop = if6_seq_stop,
2850 };
2851
2852 static int if6_seq_open(struct inode *inode, struct file *file)
2853 {
2854 return seq_open_net(inode, file, &if6_seq_ops,
2855 sizeof(struct if6_iter_state));
2856 }
2857
2858 static const struct file_operations if6_fops = {
2859 .owner = THIS_MODULE,
2860 .open = if6_seq_open,
2861 .read = seq_read,
2862 .llseek = seq_lseek,
2863 .release = seq_release_net,
2864 };
2865
2866 static int if6_proc_net_init(struct net *net)
2867 {
2868 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2869 return -ENOMEM;
2870 return 0;
2871 }
2872
2873 static void if6_proc_net_exit(struct net *net)
2874 {
2875 proc_net_remove(net, "if_inet6");
2876 }
2877
2878 static struct pernet_operations if6_proc_net_ops = {
2879 .init = if6_proc_net_init,
2880 .exit = if6_proc_net_exit,
2881 };
2882
2883 int __init if6_proc_init(void)
2884 {
2885 return register_pernet_subsys(&if6_proc_net_ops);
2886 }
2887
2888 void if6_proc_exit(void)
2889 {
2890 unregister_pernet_subsys(&if6_proc_net_ops);
2891 }
2892 #endif /* CONFIG_PROC_FS */
2893
2894 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2895 /* Check if address is a home address configured on any interface. */
2896 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2897 {
2898 int ret = 0;
2899 struct inet6_ifaddr * ifp;
2900 u8 hash = ipv6_addr_hash(addr);
2901 read_lock_bh(&addrconf_hash_lock);
2902 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2903 if (ifp->idev->dev->nd_net != net)
2904 continue;
2905 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2906 (ifp->flags & IFA_F_HOMEADDRESS)) {
2907 ret = 1;
2908 break;
2909 }
2910 }
2911 read_unlock_bh(&addrconf_hash_lock);
2912 return ret;
2913 }
2914 #endif
2915
2916 /*
2917 * Periodic address status verification
2918 */
2919
2920 static void addrconf_verify(unsigned long foo)
2921 {
2922 struct inet6_ifaddr *ifp;
2923 unsigned long now, next;
2924 int i;
2925
2926 spin_lock_bh(&addrconf_verify_lock);
2927 now = jiffies;
2928 next = now + ADDR_CHECK_FREQUENCY;
2929
2930 del_timer(&addr_chk_timer);
2931
2932 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2933
2934 restart:
2935 read_lock(&addrconf_hash_lock);
2936 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2937 unsigned long age;
2938 #ifdef CONFIG_IPV6_PRIVACY
2939 unsigned long regen_advance;
2940 #endif
2941
2942 if (ifp->flags & IFA_F_PERMANENT)
2943 continue;
2944
2945 spin_lock(&ifp->lock);
2946 age = (now - ifp->tstamp) / HZ;
2947
2948 #ifdef CONFIG_IPV6_PRIVACY
2949 regen_advance = ifp->idev->cnf.regen_max_retry *
2950 ifp->idev->cnf.dad_transmits *
2951 ifp->idev->nd_parms->retrans_time / HZ;
2952 #endif
2953
2954 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2955 age >= ifp->valid_lft) {
2956 spin_unlock(&ifp->lock);
2957 in6_ifa_hold(ifp);
2958 read_unlock(&addrconf_hash_lock);
2959 ipv6_del_addr(ifp);
2960 goto restart;
2961 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2962 spin_unlock(&ifp->lock);
2963 continue;
2964 } else if (age >= ifp->prefered_lft) {
2965 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2966 int deprecate = 0;
2967
2968 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2969 deprecate = 1;
2970 ifp->flags |= IFA_F_DEPRECATED;
2971 }
2972
2973 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2974 next = ifp->tstamp + ifp->valid_lft * HZ;
2975
2976 spin_unlock(&ifp->lock);
2977
2978 if (deprecate) {
2979 in6_ifa_hold(ifp);
2980 read_unlock(&addrconf_hash_lock);
2981
2982 ipv6_ifa_notify(0, ifp);
2983 in6_ifa_put(ifp);
2984 goto restart;
2985 }
2986 #ifdef CONFIG_IPV6_PRIVACY
2987 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2988 !(ifp->flags&IFA_F_TENTATIVE)) {
2989 if (age >= ifp->prefered_lft - regen_advance) {
2990 struct inet6_ifaddr *ifpub = ifp->ifpub;
2991 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2992 next = ifp->tstamp + ifp->prefered_lft * HZ;
2993 if (!ifp->regen_count && ifpub) {
2994 ifp->regen_count++;
2995 in6_ifa_hold(ifp);
2996 in6_ifa_hold(ifpub);
2997 spin_unlock(&ifp->lock);
2998 read_unlock(&addrconf_hash_lock);
2999 spin_lock(&ifpub->lock);
3000 ifpub->regen_count = 0;
3001 spin_unlock(&ifpub->lock);
3002 ipv6_create_tempaddr(ifpub, ifp);
3003 in6_ifa_put(ifpub);
3004 in6_ifa_put(ifp);
3005 goto restart;
3006 }
3007 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3008 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3009 spin_unlock(&ifp->lock);
3010 #endif
3011 } else {
3012 /* ifp->prefered_lft <= ifp->valid_lft */
3013 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3014 next = ifp->tstamp + ifp->prefered_lft * HZ;
3015 spin_unlock(&ifp->lock);
3016 }
3017 }
3018 read_unlock(&addrconf_hash_lock);
3019 }
3020
3021 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3022 add_timer(&addr_chk_timer);
3023 spin_unlock_bh(&addrconf_verify_lock);
3024 }
3025
3026 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3027 {
3028 struct in6_addr *pfx = NULL;
3029
3030 if (addr)
3031 pfx = nla_data(addr);
3032
3033 if (local) {
3034 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3035 pfx = NULL;
3036 else
3037 pfx = nla_data(local);
3038 }
3039
3040 return pfx;
3041 }
3042
3043 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3044 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3045 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3046 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3047 };
3048
3049 static int
3050 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3051 {
3052 struct net *net = skb->sk->sk_net;
3053 struct ifaddrmsg *ifm;
3054 struct nlattr *tb[IFA_MAX+1];
3055 struct in6_addr *pfx;
3056 int err;
3057
3058 if (net != &init_net)
3059 return -EINVAL;
3060
3061 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3062 if (err < 0)
3063 return err;
3064
3065 ifm = nlmsg_data(nlh);
3066 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3067 if (pfx == NULL)
3068 return -EINVAL;
3069
3070 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3071 }
3072
3073 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3074 u32 prefered_lft, u32 valid_lft)
3075 {
3076 u32 flags = RTF_EXPIRES;
3077
3078 if (!valid_lft || (prefered_lft > valid_lft))
3079 return -EINVAL;
3080
3081 if (valid_lft == INFINITY_LIFE_TIME) {
3082 ifa_flags |= IFA_F_PERMANENT;
3083 flags = 0;
3084 } else if (valid_lft >= 0x7FFFFFFF/HZ)
3085 valid_lft = 0x7FFFFFFF/HZ;
3086
3087 if (prefered_lft == 0)
3088 ifa_flags |= IFA_F_DEPRECATED;
3089 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3090 (prefered_lft != INFINITY_LIFE_TIME))
3091 prefered_lft = 0x7FFFFFFF/HZ;
3092
3093 spin_lock_bh(&ifp->lock);
3094 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3095 ifp->tstamp = jiffies;
3096 ifp->valid_lft = valid_lft;
3097 ifp->prefered_lft = prefered_lft;
3098
3099 spin_unlock_bh(&ifp->lock);
3100 if (!(ifp->flags&IFA_F_TENTATIVE))
3101 ipv6_ifa_notify(0, ifp);
3102
3103 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3104 jiffies_to_clock_t(valid_lft * HZ), flags);
3105 addrconf_verify(0);
3106
3107 return 0;
3108 }
3109
3110 static int
3111 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3112 {
3113 struct net *net = skb->sk->sk_net;
3114 struct ifaddrmsg *ifm;
3115 struct nlattr *tb[IFA_MAX+1];
3116 struct in6_addr *pfx;
3117 struct inet6_ifaddr *ifa;
3118 struct net_device *dev;
3119 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3120 u8 ifa_flags;
3121 int err;
3122
3123 if (net != &init_net)
3124 return -EINVAL;
3125
3126 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3127 if (err < 0)
3128 return err;
3129
3130 ifm = nlmsg_data(nlh);
3131 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3132 if (pfx == NULL)
3133 return -EINVAL;
3134
3135 if (tb[IFA_CACHEINFO]) {
3136 struct ifa_cacheinfo *ci;
3137
3138 ci = nla_data(tb[IFA_CACHEINFO]);
3139 valid_lft = ci->ifa_valid;
3140 preferred_lft = ci->ifa_prefered;
3141 } else {
3142 preferred_lft = INFINITY_LIFE_TIME;
3143 valid_lft = INFINITY_LIFE_TIME;
3144 }
3145
3146 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3147 if (dev == NULL)
3148 return -ENODEV;
3149
3150 /* We ignore other flags so far. */
3151 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3152
3153 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3154 if (ifa == NULL) {
3155 /*
3156 * It would be best to check for !NLM_F_CREATE here but
3157 * userspace alreay relies on not having to provide this.
3158 */
3159 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3160 ifa_flags, preferred_lft, valid_lft);
3161 }
3162
3163 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3164 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3165 err = -EEXIST;
3166 else
3167 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3168
3169 in6_ifa_put(ifa);
3170
3171 return err;
3172 }
3173
3174 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3175 u8 scope, int ifindex)
3176 {
3177 struct ifaddrmsg *ifm;
3178
3179 ifm = nlmsg_data(nlh);
3180 ifm->ifa_family = AF_INET6;
3181 ifm->ifa_prefixlen = prefixlen;
3182 ifm->ifa_flags = flags;
3183 ifm->ifa_scope = scope;
3184 ifm->ifa_index = ifindex;
3185 }
3186
3187 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3188 unsigned long tstamp, u32 preferred, u32 valid)
3189 {
3190 struct ifa_cacheinfo ci;
3191
3192 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3193 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3194 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3195 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3196 ci.ifa_prefered = preferred;
3197 ci.ifa_valid = valid;
3198
3199 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3200 }
3201
3202 static inline int rt_scope(int ifa_scope)
3203 {
3204 if (ifa_scope & IFA_HOST)
3205 return RT_SCOPE_HOST;
3206 else if (ifa_scope & IFA_LINK)
3207 return RT_SCOPE_LINK;
3208 else if (ifa_scope & IFA_SITE)
3209 return RT_SCOPE_SITE;
3210 else
3211 return RT_SCOPE_UNIVERSE;
3212 }
3213
3214 static inline int inet6_ifaddr_msgsize(void)
3215 {
3216 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3217 + nla_total_size(16) /* IFA_ADDRESS */
3218 + nla_total_size(sizeof(struct ifa_cacheinfo));
3219 }
3220
3221 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3222 u32 pid, u32 seq, int event, unsigned int flags)
3223 {
3224 struct nlmsghdr *nlh;
3225 u32 preferred, valid;
3226
3227 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3228 if (nlh == NULL)
3229 return -EMSGSIZE;
3230
3231 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3232 ifa->idev->dev->ifindex);
3233
3234 if (!(ifa->flags&IFA_F_PERMANENT)) {
3235 preferred = ifa->prefered_lft;
3236 valid = ifa->valid_lft;
3237 if (preferred != INFINITY_LIFE_TIME) {
3238 long tval = (jiffies - ifa->tstamp)/HZ;
3239 preferred -= tval;
3240 if (valid != INFINITY_LIFE_TIME)
3241 valid -= tval;
3242 }
3243 } else {
3244 preferred = INFINITY_LIFE_TIME;
3245 valid = INFINITY_LIFE_TIME;
3246 }
3247
3248 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3249 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3250 nlmsg_cancel(skb, nlh);
3251 return -EMSGSIZE;
3252 }
3253
3254 return nlmsg_end(skb, nlh);
3255 }
3256
3257 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3258 u32 pid, u32 seq, int event, u16 flags)
3259 {
3260 struct nlmsghdr *nlh;
3261 u8 scope = RT_SCOPE_UNIVERSE;
3262 int ifindex = ifmca->idev->dev->ifindex;
3263
3264 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3265 scope = RT_SCOPE_SITE;
3266
3267 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3268 if (nlh == NULL)
3269 return -EMSGSIZE;
3270
3271 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3272 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3273 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3274 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3275 nlmsg_cancel(skb, nlh);
3276 return -EMSGSIZE;
3277 }
3278
3279 return nlmsg_end(skb, nlh);
3280 }
3281
3282 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3283 u32 pid, u32 seq, int event, unsigned int flags)
3284 {
3285 struct nlmsghdr *nlh;
3286 u8 scope = RT_SCOPE_UNIVERSE;
3287 int ifindex = ifaca->aca_idev->dev->ifindex;
3288
3289 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3290 scope = RT_SCOPE_SITE;
3291
3292 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3293 if (nlh == NULL)
3294 return -EMSGSIZE;
3295
3296 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3297 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3298 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3299 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3300 nlmsg_cancel(skb, nlh);
3301 return -EMSGSIZE;
3302 }
3303
3304 return nlmsg_end(skb, nlh);
3305 }
3306
3307 enum addr_type_t
3308 {
3309 UNICAST_ADDR,
3310 MULTICAST_ADDR,
3311 ANYCAST_ADDR,
3312 };
3313
3314 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3315 enum addr_type_t type)
3316 {
3317 int idx, ip_idx;
3318 int s_idx, s_ip_idx;
3319 int err = 1;
3320 struct net_device *dev;
3321 struct inet6_dev *idev = NULL;
3322 struct inet6_ifaddr *ifa;
3323 struct ifmcaddr6 *ifmca;
3324 struct ifacaddr6 *ifaca;
3325
3326 s_idx = cb->args[0];
3327 s_ip_idx = ip_idx = cb->args[1];
3328
3329 idx = 0;
3330 for_each_netdev(&init_net, dev) {
3331 if (idx < s_idx)
3332 goto cont;
3333 if (idx > s_idx)
3334 s_ip_idx = 0;
3335 ip_idx = 0;
3336 if ((idev = in6_dev_get(dev)) == NULL)
3337 goto cont;
3338 read_lock_bh(&idev->lock);
3339 switch (type) {
3340 case UNICAST_ADDR:
3341 /* unicast address incl. temp addr */
3342 for (ifa = idev->addr_list; ifa;
3343 ifa = ifa->if_next, ip_idx++) {
3344 if (ip_idx < s_ip_idx)
3345 continue;
3346 err = inet6_fill_ifaddr(skb, ifa,
3347 NETLINK_CB(cb->skb).pid,
3348 cb->nlh->nlmsg_seq,
3349 RTM_NEWADDR,
3350 NLM_F_MULTI);
3351 }
3352 break;
3353 case MULTICAST_ADDR:
3354 /* multicast address */
3355 for (ifmca = idev->mc_list; ifmca;
3356 ifmca = ifmca->next, ip_idx++) {
3357 if (ip_idx < s_ip_idx)
3358 continue;
3359 err = inet6_fill_ifmcaddr(skb, ifmca,
3360 NETLINK_CB(cb->skb).pid,
3361 cb->nlh->nlmsg_seq,
3362 RTM_GETMULTICAST,
3363 NLM_F_MULTI);
3364 }
3365 break;
3366 case ANYCAST_ADDR:
3367 /* anycast address */
3368 for (ifaca = idev->ac_list; ifaca;
3369 ifaca = ifaca->aca_next, ip_idx++) {
3370 if (ip_idx < s_ip_idx)
3371 continue;
3372 err = inet6_fill_ifacaddr(skb, ifaca,
3373 NETLINK_CB(cb->skb).pid,
3374 cb->nlh->nlmsg_seq,
3375 RTM_GETANYCAST,
3376 NLM_F_MULTI);
3377 }
3378 break;
3379 default:
3380 break;
3381 }
3382 read_unlock_bh(&idev->lock);
3383 in6_dev_put(idev);
3384
3385 if (err <= 0)
3386 break;
3387 cont:
3388 idx++;
3389 }
3390 cb->args[0] = idx;
3391 cb->args[1] = ip_idx;
3392 return skb->len;
3393 }
3394
3395 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3396 {
3397 struct net *net = skb->sk->sk_net;
3398 enum addr_type_t type = UNICAST_ADDR;
3399
3400 if (net != &init_net)
3401 return 0;
3402
3403 return inet6_dump_addr(skb, cb, type);
3404 }
3405
3406 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3407 {
3408 struct net *net = skb->sk->sk_net;
3409 enum addr_type_t type = MULTICAST_ADDR;
3410
3411 if (net != &init_net)
3412 return 0;
3413
3414 return inet6_dump_addr(skb, cb, type);
3415 }
3416
3417
3418 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3419 {
3420 struct net *net = skb->sk->sk_net;
3421 enum addr_type_t type = ANYCAST_ADDR;
3422
3423 if (net != &init_net)
3424 return 0;
3425
3426 return inet6_dump_addr(skb, cb, type);
3427 }
3428
3429 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3430 void *arg)
3431 {
3432 struct net *net = in_skb->sk->sk_net;
3433 struct ifaddrmsg *ifm;
3434 struct nlattr *tb[IFA_MAX+1];
3435 struct in6_addr *addr = NULL;
3436 struct net_device *dev = NULL;
3437 struct inet6_ifaddr *ifa;
3438 struct sk_buff *skb;
3439 int err;
3440
3441 if (net != &init_net)
3442 return -EINVAL;
3443
3444 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3445 if (err < 0)
3446 goto errout;
3447
3448 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3449 if (addr == NULL) {
3450 err = -EINVAL;
3451 goto errout;
3452 }
3453
3454 ifm = nlmsg_data(nlh);
3455 if (ifm->ifa_index)
3456 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3457
3458 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3459 err = -EADDRNOTAVAIL;
3460 goto errout;
3461 }
3462
3463 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3464 err = -ENOBUFS;
3465 goto errout_ifa;
3466 }
3467
3468 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3469 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3470 if (err < 0) {
3471 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3472 WARN_ON(err == -EMSGSIZE);
3473 kfree_skb(skb);
3474 goto errout_ifa;
3475 }
3476 err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
3477 errout_ifa:
3478 in6_ifa_put(ifa);
3479 errout:
3480 return err;
3481 }
3482
3483 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3484 {
3485 struct sk_buff *skb;
3486 int err = -ENOBUFS;
3487
3488 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3489 if (skb == NULL)
3490 goto errout;
3491
3492 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3493 if (err < 0) {
3494 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3495 WARN_ON(err == -EMSGSIZE);
3496 kfree_skb(skb);
3497 goto errout;
3498 }
3499 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3500 errout:
3501 if (err < 0)
3502 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3503 }
3504
3505 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3506 __s32 *array, int bytes)
3507 {
3508 BUG_ON(bytes < (DEVCONF_MAX * 4));
3509
3510 memset(array, 0, bytes);
3511 array[DEVCONF_FORWARDING] = cnf->forwarding;
3512 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3513 array[DEVCONF_MTU6] = cnf->mtu6;
3514 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3515 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3516 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3517 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3518 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3519 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3520 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3521 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3522 #ifdef CONFIG_IPV6_PRIVACY
3523 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3524 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3525 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3526 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3527 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3528 #endif
3529 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3530 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3531 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3532 #ifdef CONFIG_IPV6_ROUTER_PREF
3533 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3534 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3535 #ifdef CONFIG_IPV6_ROUTE_INFO
3536 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3537 #endif
3538 #endif
3539 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3540 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3541 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3542 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3543 #endif
3544 }
3545
3546 static inline size_t inet6_if_nlmsg_size(void)
3547 {
3548 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3549 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3550 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3551 + nla_total_size(4) /* IFLA_MTU */
3552 + nla_total_size(4) /* IFLA_LINK */
3553 + nla_total_size( /* IFLA_PROTINFO */
3554 nla_total_size(4) /* IFLA_INET6_FLAGS */
3555 + nla_total_size(sizeof(struct ifla_cacheinfo))
3556 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3557 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3558 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3559 );
3560 }
3561
3562 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3563 int bytes)
3564 {
3565 int i;
3566 int pad = bytes - sizeof(u64) * items;
3567 BUG_ON(pad < 0);
3568
3569 /* Use put_unaligned() because stats may not be aligned for u64. */
3570 put_unaligned(items, &stats[0]);
3571 for (i = 1; i < items; i++)
3572 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3573
3574 memset(&stats[items], 0, pad);
3575 }
3576
3577 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3578 int bytes)
3579 {
3580 switch(attrtype) {
3581 case IFLA_INET6_STATS:
3582 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3583 break;
3584 case IFLA_INET6_ICMP6STATS:
3585 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3586 break;
3587 }
3588 }
3589
3590 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3591 u32 pid, u32 seq, int event, unsigned int flags)
3592 {
3593 struct net_device *dev = idev->dev;
3594 struct nlattr *nla;
3595 struct ifinfomsg *hdr;
3596 struct nlmsghdr *nlh;
3597 void *protoinfo;
3598 struct ifla_cacheinfo ci;
3599
3600 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3601 if (nlh == NULL)
3602 return -EMSGSIZE;
3603
3604 hdr = nlmsg_data(nlh);
3605 hdr->ifi_family = AF_INET6;
3606 hdr->__ifi_pad = 0;
3607 hdr->ifi_type = dev->type;
3608 hdr->ifi_index = dev->ifindex;
3609 hdr->ifi_flags = dev_get_flags(dev);
3610 hdr->ifi_change = 0;
3611
3612 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3613
3614 if (dev->addr_len)
3615 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3616
3617 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3618 if (dev->ifindex != dev->iflink)
3619 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3620
3621 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3622 if (protoinfo == NULL)
3623 goto nla_put_failure;
3624
3625 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3626
3627 ci.max_reasm_len = IPV6_MAXPLEN;
3628 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3629 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3630 ci.reachable_time = idev->nd_parms->reachable_time;
3631 ci.retrans_time = idev->nd_parms->retrans_time;
3632 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3633
3634 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3635 if (nla == NULL)
3636 goto nla_put_failure;
3637 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3638
3639 /* XXX - MC not implemented */
3640
3641 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3642 if (nla == NULL)
3643 goto nla_put_failure;
3644 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3645
3646 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3647 if (nla == NULL)
3648 goto nla_put_failure;
3649 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3650
3651 nla_nest_end(skb, protoinfo);
3652 return nlmsg_end(skb, nlh);
3653
3654 nla_put_failure:
3655 nlmsg_cancel(skb, nlh);
3656 return -EMSGSIZE;
3657 }
3658
3659 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3660 {
3661 struct net *net = skb->sk->sk_net;
3662 int idx, err;
3663 int s_idx = cb->args[0];
3664 struct net_device *dev;
3665 struct inet6_dev *idev;
3666
3667 if (net != &init_net)
3668 return 0;
3669
3670 read_lock(&dev_base_lock);
3671 idx = 0;
3672 for_each_netdev(&init_net, dev) {
3673 if (idx < s_idx)
3674 goto cont;
3675 if ((idev = in6_dev_get(dev)) == NULL)
3676 goto cont;
3677 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3678 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3679 in6_dev_put(idev);
3680 if (err <= 0)
3681 break;
3682 cont:
3683 idx++;
3684 }
3685 read_unlock(&dev_base_lock);
3686 cb->args[0] = idx;
3687
3688 return skb->len;
3689 }
3690
3691 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3692 {
3693 struct sk_buff *skb;
3694 int err = -ENOBUFS;
3695
3696 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3697 if (skb == NULL)
3698 goto errout;
3699
3700 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3701 if (err < 0) {
3702 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3703 WARN_ON(err == -EMSGSIZE);
3704 kfree_skb(skb);
3705 goto errout;
3706 }
3707 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3708 errout:
3709 if (err < 0)
3710 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3711 }
3712
3713 static inline size_t inet6_prefix_nlmsg_size(void)
3714 {
3715 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3716 + nla_total_size(sizeof(struct in6_addr))
3717 + nla_total_size(sizeof(struct prefix_cacheinfo));
3718 }
3719
3720 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3721 struct prefix_info *pinfo, u32 pid, u32 seq,
3722 int event, unsigned int flags)
3723 {
3724 struct prefixmsg *pmsg;
3725 struct nlmsghdr *nlh;
3726 struct prefix_cacheinfo ci;
3727
3728 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3729 if (nlh == NULL)
3730 return -EMSGSIZE;
3731
3732 pmsg = nlmsg_data(nlh);
3733 pmsg->prefix_family = AF_INET6;
3734 pmsg->prefix_pad1 = 0;
3735 pmsg->prefix_pad2 = 0;
3736 pmsg->prefix_ifindex = idev->dev->ifindex;
3737 pmsg->prefix_len = pinfo->prefix_len;
3738 pmsg->prefix_type = pinfo->type;
3739 pmsg->prefix_pad3 = 0;
3740 pmsg->prefix_flags = 0;
3741 if (pinfo->onlink)
3742 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3743 if (pinfo->autoconf)
3744 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3745
3746 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3747
3748 ci.preferred_time = ntohl(pinfo->prefered);
3749 ci.valid_time = ntohl(pinfo->valid);
3750 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3751
3752 return nlmsg_end(skb, nlh);
3753
3754 nla_put_failure:
3755 nlmsg_cancel(skb, nlh);
3756 return -EMSGSIZE;
3757 }
3758
3759 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3760 struct prefix_info *pinfo)
3761 {
3762 struct sk_buff *skb;
3763 int err = -ENOBUFS;
3764
3765 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3766 if (skb == NULL)
3767 goto errout;
3768
3769 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3770 if (err < 0) {
3771 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3772 WARN_ON(err == -EMSGSIZE);
3773 kfree_skb(skb);
3774 goto errout;
3775 }
3776 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3777 errout:
3778 if (err < 0)
3779 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
3780 }
3781
3782 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3783 {
3784 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3785
3786 switch (event) {
3787 case RTM_NEWADDR:
3788 /*
3789 * If the address was optimistic
3790 * we inserted the route at the start of
3791 * our DAD process, so we don't need
3792 * to do it again
3793 */
3794 if (!(ifp->rt->rt6i_node))
3795 ip6_ins_rt(ifp->rt);
3796 if (ifp->idev->cnf.forwarding)
3797 addrconf_join_anycast(ifp);
3798 break;
3799 case RTM_DELADDR:
3800 if (ifp->idev->cnf.forwarding)
3801 addrconf_leave_anycast(ifp);
3802 addrconf_leave_solict(ifp->idev, &ifp->addr);
3803 dst_hold(&ifp->rt->u.dst);
3804 if (ip6_del_rt(ifp->rt))
3805 dst_free(&ifp->rt->u.dst);
3806 break;
3807 }
3808 }
3809
3810 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3811 {
3812 rcu_read_lock_bh();
3813 if (likely(ifp->idev->dead == 0))
3814 __ipv6_ifa_notify(event, ifp);
3815 rcu_read_unlock_bh();
3816 }
3817
3818 #ifdef CONFIG_SYSCTL
3819
3820 static
3821 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3822 void __user *buffer, size_t *lenp, loff_t *ppos)
3823 {
3824 int *valp = ctl->data;
3825 int val = *valp;
3826 int ret;
3827
3828 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3829
3830 if (write)
3831 addrconf_fixup_forwarding(ctl, valp, val);
3832 return ret;
3833 }
3834
3835 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3836 int __user *name, int nlen,
3837 void __user *oldval,
3838 size_t __user *oldlenp,
3839 void __user *newval, size_t newlen)
3840 {
3841 int *valp = table->data;
3842 int val = *valp;
3843 int new;
3844
3845 if (!newval || !newlen)
3846 return 0;
3847 if (newlen != sizeof(int))
3848 return -EINVAL;
3849 if (get_user(new, (int __user *)newval))
3850 return -EFAULT;
3851 if (new == *valp)
3852 return 0;
3853 if (oldval && oldlenp) {
3854 size_t len;
3855 if (get_user(len, oldlenp))
3856 return -EFAULT;
3857 if (len) {
3858 if (len > table->maxlen)
3859 len = table->maxlen;
3860 if (copy_to_user(oldval, valp, len))
3861 return -EFAULT;
3862 if (put_user(len, oldlenp))
3863 return -EFAULT;
3864 }
3865 }
3866
3867 *valp = new;
3868 addrconf_fixup_forwarding(table, valp, val);
3869 return 1;
3870 }
3871
3872 static struct addrconf_sysctl_table
3873 {
3874 struct ctl_table_header *sysctl_header;
3875 ctl_table addrconf_vars[__NET_IPV6_MAX];
3876 char *dev_name;
3877 } addrconf_sysctl __read_mostly = {
3878 .sysctl_header = NULL,
3879 .addrconf_vars = {
3880 {
3881 .ctl_name = NET_IPV6_FORWARDING,
3882 .procname = "forwarding",
3883 .data = &ipv6_devconf.forwarding,
3884 .maxlen = sizeof(int),
3885 .mode = 0644,
3886 .proc_handler = &addrconf_sysctl_forward,
3887 .strategy = &addrconf_sysctl_forward_strategy,
3888 },
3889 {
3890 .ctl_name = NET_IPV6_HOP_LIMIT,
3891 .procname = "hop_limit",
3892 .data = &ipv6_devconf.hop_limit,
3893 .maxlen = sizeof(int),
3894 .mode = 0644,
3895 .proc_handler = proc_dointvec,
3896 },
3897 {
3898 .ctl_name = NET_IPV6_MTU,
3899 .procname = "mtu",
3900 .data = &ipv6_devconf.mtu6,
3901 .maxlen = sizeof(int),
3902 .mode = 0644,
3903 .proc_handler = &proc_dointvec,
3904 },
3905 {
3906 .ctl_name = NET_IPV6_ACCEPT_RA,
3907 .procname = "accept_ra",
3908 .data = &ipv6_devconf.accept_ra,
3909 .maxlen = sizeof(int),
3910 .mode = 0644,
3911 .proc_handler = &proc_dointvec,
3912 },
3913 {
3914 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3915 .procname = "accept_redirects",
3916 .data = &ipv6_devconf.accept_redirects,
3917 .maxlen = sizeof(int),
3918 .mode = 0644,
3919 .proc_handler = &proc_dointvec,
3920 },
3921 {
3922 .ctl_name = NET_IPV6_AUTOCONF,
3923 .procname = "autoconf",
3924 .data = &ipv6_devconf.autoconf,
3925 .maxlen = sizeof(int),
3926 .mode = 0644,
3927 .proc_handler = &proc_dointvec,
3928 },
3929 {
3930 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3931 .procname = "dad_transmits",
3932 .data = &ipv6_devconf.dad_transmits,
3933 .maxlen = sizeof(int),
3934 .mode = 0644,
3935 .proc_handler = &proc_dointvec,
3936 },
3937 {
3938 .ctl_name = NET_IPV6_RTR_SOLICITS,
3939 .procname = "router_solicitations",
3940 .data = &ipv6_devconf.rtr_solicits,
3941 .maxlen = sizeof(int),
3942 .mode = 0644,
3943 .proc_handler = &proc_dointvec,
3944 },
3945 {
3946 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3947 .procname = "router_solicitation_interval",
3948 .data = &ipv6_devconf.rtr_solicit_interval,
3949 .maxlen = sizeof(int),
3950 .mode = 0644,
3951 .proc_handler = &proc_dointvec_jiffies,
3952 .strategy = &sysctl_jiffies,
3953 },
3954 {
3955 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3956 .procname = "router_solicitation_delay",
3957 .data = &ipv6_devconf.rtr_solicit_delay,
3958 .maxlen = sizeof(int),
3959 .mode = 0644,
3960 .proc_handler = &proc_dointvec_jiffies,
3961 .strategy = &sysctl_jiffies,
3962 },
3963 {
3964 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3965 .procname = "force_mld_version",
3966 .data = &ipv6_devconf.force_mld_version,
3967 .maxlen = sizeof(int),
3968 .mode = 0644,
3969 .proc_handler = &proc_dointvec,
3970 },
3971 #ifdef CONFIG_IPV6_PRIVACY
3972 {
3973 .ctl_name = NET_IPV6_USE_TEMPADDR,
3974 .procname = "use_tempaddr",
3975 .data = &ipv6_devconf.use_tempaddr,
3976 .maxlen = sizeof(int),
3977 .mode = 0644,
3978 .proc_handler = &proc_dointvec,
3979 },
3980 {
3981 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3982 .procname = "temp_valid_lft",
3983 .data = &ipv6_devconf.temp_valid_lft,
3984 .maxlen = sizeof(int),
3985 .mode = 0644,
3986 .proc_handler = &proc_dointvec,
3987 },
3988 {
3989 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3990 .procname = "temp_prefered_lft",
3991 .data = &ipv6_devconf.temp_prefered_lft,
3992 .maxlen = sizeof(int),
3993 .mode = 0644,
3994 .proc_handler = &proc_dointvec,
3995 },
3996 {
3997 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3998 .procname = "regen_max_retry",
3999 .data = &ipv6_devconf.regen_max_retry,
4000 .maxlen = sizeof(int),
4001 .mode = 0644,
4002 .proc_handler = &proc_dointvec,
4003 },
4004 {
4005 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4006 .procname = "max_desync_factor",
4007 .data = &ipv6_devconf.max_desync_factor,
4008 .maxlen = sizeof(int),
4009 .mode = 0644,
4010 .proc_handler = &proc_dointvec,
4011 },
4012 #endif
4013 {
4014 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4015 .procname = "max_addresses",
4016 .data = &ipv6_devconf.max_addresses,
4017 .maxlen = sizeof(int),
4018 .mode = 0644,
4019 .proc_handler = &proc_dointvec,
4020 },
4021 {
4022 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4023 .procname = "accept_ra_defrtr",
4024 .data = &ipv6_devconf.accept_ra_defrtr,
4025 .maxlen = sizeof(int),
4026 .mode = 0644,
4027 .proc_handler = &proc_dointvec,
4028 },
4029 {
4030 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4031 .procname = "accept_ra_pinfo",
4032 .data = &ipv6_devconf.accept_ra_pinfo,
4033 .maxlen = sizeof(int),
4034 .mode = 0644,
4035 .proc_handler = &proc_dointvec,
4036 },
4037 #ifdef CONFIG_IPV6_ROUTER_PREF
4038 {
4039 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4040 .procname = "accept_ra_rtr_pref",
4041 .data = &ipv6_devconf.accept_ra_rtr_pref,
4042 .maxlen = sizeof(int),
4043 .mode = 0644,
4044 .proc_handler = &proc_dointvec,
4045 },
4046 {
4047 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4048 .procname = "router_probe_interval",
4049 .data = &ipv6_devconf.rtr_probe_interval,
4050 .maxlen = sizeof(int),
4051 .mode = 0644,
4052 .proc_handler = &proc_dointvec_jiffies,
4053 .strategy = &sysctl_jiffies,
4054 },
4055 #ifdef CONFIG_IPV6_ROUTE_INFO
4056 {
4057 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4058 .procname = "accept_ra_rt_info_max_plen",
4059 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4060 .maxlen = sizeof(int),
4061 .mode = 0644,
4062 .proc_handler = &proc_dointvec,
4063 },
4064 #endif
4065 #endif
4066 {
4067 .ctl_name = NET_IPV6_PROXY_NDP,
4068 .procname = "proxy_ndp",
4069 .data = &ipv6_devconf.proxy_ndp,
4070 .maxlen = sizeof(int),
4071 .mode = 0644,
4072 .proc_handler = &proc_dointvec,
4073 },
4074 {
4075 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4076 .procname = "accept_source_route",
4077 .data = &ipv6_devconf.accept_source_route,
4078 .maxlen = sizeof(int),
4079 .mode = 0644,
4080 .proc_handler = &proc_dointvec,
4081 },
4082 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4083 {
4084 .ctl_name = CTL_UNNUMBERED,
4085 .procname = "optimistic_dad",
4086 .data = &ipv6_devconf.optimistic_dad,
4087 .maxlen = sizeof(int),
4088 .mode = 0644,
4089 .proc_handler = &proc_dointvec,
4090
4091 },
4092 #endif
4093 {
4094 .ctl_name = 0, /* sentinel */
4095 }
4096 },
4097 };
4098
4099 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4100 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4101 {
4102 int i;
4103 struct addrconf_sysctl_table *t;
4104
4105 #define ADDRCONF_CTL_PATH_DEV 3
4106
4107 struct ctl_path addrconf_ctl_path[] = {
4108 { .procname = "net", .ctl_name = CTL_NET, },
4109 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4110 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4111 { /* to be set */ },
4112 { },
4113 };
4114
4115
4116 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4117 if (t == NULL)
4118 goto out;
4119
4120 for (i=0; t->addrconf_vars[i].data; i++) {
4121 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4122 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4123 t->addrconf_vars[i].extra2 = net;
4124 }
4125
4126 /*
4127 * Make a copy of dev_name, because '.procname' is regarded as const
4128 * by sysctl and we wouldn't want anyone to change it under our feet
4129 * (see SIOCSIFNAME).
4130 */
4131 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4132 if (!t->dev_name)
4133 goto free;
4134
4135 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4136 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4137
4138 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4139 t->addrconf_vars);
4140 if (t->sysctl_header == NULL)
4141 goto free_procname;
4142
4143 p->sysctl = t;
4144 return 0;
4145
4146 free_procname:
4147 kfree(t->dev_name);
4148 free:
4149 kfree(t);
4150 out:
4151 return -ENOBUFS;
4152 }
4153
4154 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4155 {
4156 struct addrconf_sysctl_table *t;
4157
4158 if (p->sysctl == NULL)
4159 return;
4160
4161 t = p->sysctl;
4162 p->sysctl = NULL;
4163 unregister_sysctl_table(t->sysctl_header);
4164 kfree(t->dev_name);
4165 kfree(t);
4166 }
4167
4168 static void addrconf_sysctl_register(struct inet6_dev *idev)
4169 {
4170 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4171 NET_IPV6_NEIGH, "ipv6",
4172 &ndisc_ifinfo_sysctl_change,
4173 NULL);
4174 __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
4175 idev->dev->ifindex, idev, &idev->cnf);
4176 }
4177
4178 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4179 {
4180 __addrconf_sysctl_unregister(&idev->cnf);
4181 neigh_sysctl_unregister(idev->nd_parms);
4182 }
4183
4184
4185 #endif
4186
4187 static int addrconf_init_net(struct net *net)
4188 {
4189 int err;
4190 struct ipv6_devconf *all, *dflt;
4191
4192 err = -ENOMEM;
4193 all = &ipv6_devconf;
4194 dflt = &ipv6_devconf_dflt;
4195
4196 if (net != &init_net) {
4197 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4198 if (all == NULL)
4199 goto err_alloc_all;
4200
4201 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4202 if (dflt == NULL)
4203 goto err_alloc_dflt;
4204 }
4205
4206 net->ipv6.devconf_all = all;
4207 net->ipv6.devconf_dflt = dflt;
4208
4209 #ifdef CONFIG_SYSCTL
4210 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4211 NULL, all);
4212 if (err < 0)
4213 goto err_reg_all;
4214
4215 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4216 NULL, dflt);
4217 if (err < 0)
4218 goto err_reg_dflt;
4219 #endif
4220 return 0;
4221
4222 #ifdef CONFIG_SYSCTL
4223 err_reg_dflt:
4224 __addrconf_sysctl_unregister(all);
4225 err_reg_all:
4226 kfree(dflt);
4227 #endif
4228 err_alloc_dflt:
4229 kfree(all);
4230 err_alloc_all:
4231 return err;
4232 }
4233
4234 static void addrconf_exit_net(struct net *net)
4235 {
4236 #ifdef CONFIG_SYSCTL
4237 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4238 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4239 #endif
4240 if (net != &init_net) {
4241 kfree(net->ipv6.devconf_dflt);
4242 kfree(net->ipv6.devconf_all);
4243 }
4244 }
4245
4246 static struct pernet_operations addrconf_ops = {
4247 .init = addrconf_init_net,
4248 .exit = addrconf_exit_net,
4249 };
4250
4251 /*
4252 * Device notifier
4253 */
4254
4255 int register_inet6addr_notifier(struct notifier_block *nb)
4256 {
4257 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4258 }
4259
4260 EXPORT_SYMBOL(register_inet6addr_notifier);
4261
4262 int unregister_inet6addr_notifier(struct notifier_block *nb)
4263 {
4264 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4265 }
4266
4267 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4268
4269 /*
4270 * Init / cleanup code
4271 */
4272
4273 int __init addrconf_init(void)
4274 {
4275 int err;
4276
4277 if ((err = ipv6_addr_label_init()) < 0) {
4278 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4279 err);
4280 return err;
4281 }
4282
4283 register_pernet_subsys(&addrconf_ops);
4284
4285 /* The addrconf netdev notifier requires that loopback_dev
4286 * has it's ipv6 private information allocated and setup
4287 * before it can bring up and give link-local addresses
4288 * to other devices which are up.
4289 *
4290 * Unfortunately, loopback_dev is not necessarily the first
4291 * entry in the global dev_base list of net devices. In fact,
4292 * it is likely to be the very last entry on that list.
4293 * So this causes the notifier registry below to try and
4294 * give link-local addresses to all devices besides loopback_dev
4295 * first, then loopback_dev, which cases all the non-loopback_dev
4296 * devices to fail to get a link-local address.
4297 *
4298 * So, as a temporary fix, allocate the ipv6 structure for
4299 * loopback_dev first by hand.
4300 * Longer term, all of the dependencies ipv6 has upon the loopback
4301 * device and it being up should be removed.
4302 */
4303 rtnl_lock();
4304 if (!ipv6_add_dev(init_net.loopback_dev))
4305 err = -ENOMEM;
4306 rtnl_unlock();
4307 if (err)
4308 goto errlo;
4309
4310 ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4311 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4312 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4313 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4314 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4315 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4316 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4317 #endif
4318
4319 register_netdevice_notifier(&ipv6_dev_notf);
4320
4321 addrconf_verify(0);
4322
4323 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4324 if (err < 0)
4325 goto errout;
4326
4327 /* Only the first call to __rtnl_register can fail */
4328 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4329 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4330 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4331 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4332 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4333
4334 ipv6_addr_label_rtnl_register();
4335
4336 return 0;
4337 errout:
4338 unregister_netdevice_notifier(&ipv6_dev_notf);
4339 errlo:
4340 unregister_pernet_subsys(&addrconf_ops);
4341
4342 return err;
4343 }
4344
4345 void addrconf_cleanup(void)
4346 {
4347 struct net_device *dev;
4348 struct inet6_ifaddr *ifa;
4349 int i;
4350
4351 unregister_netdevice_notifier(&ipv6_dev_notf);
4352
4353 unregister_pernet_subsys(&addrconf_ops);
4354
4355 rtnl_lock();
4356
4357 /*
4358 * clean dev list.
4359 */
4360
4361 for_each_netdev(&init_net, dev) {
4362 if (__in6_dev_get(dev) == NULL)
4363 continue;
4364 addrconf_ifdown(dev, 1);
4365 }
4366 addrconf_ifdown(init_net.loopback_dev, 2);
4367
4368 /*
4369 * Check hash table.
4370 */
4371
4372 write_lock_bh(&addrconf_hash_lock);
4373 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4374 for (ifa=inet6_addr_lst[i]; ifa; ) {
4375 struct inet6_ifaddr *bifa;
4376
4377 bifa = ifa;
4378 ifa = ifa->lst_next;
4379 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4380 /* Do not free it; something is wrong.
4381 Now we can investigate it with debugger.
4382 */
4383 }
4384 }
4385 write_unlock_bh(&addrconf_hash_lock);
4386
4387 del_timer(&addr_chk_timer);
4388
4389 rtnl_unlock();
4390 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree