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[x86 setup] Handle case of improperly terminated E820 chain
[wrt350n-kernel.git] / net / ipv6 / addrconf.c
blob45b4c82148a065b43a4a3e14648032a69f00721d
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/sock.h>
66 #include <net/snmp.h>
67
68 #include <net/ipv6.h>
69 #include <net/protocol.h>
70 #include <net/ndisc.h>
71 #include <net/ip6_route.h>
72 #include <net/addrconf.h>
73 #include <net/tcp.h>
74 #include <net/ip.h>
75 #include <net/netlink.h>
76 #include <linux/if_tunnel.h>
77 #include <linux/rtnetlink.h>
78
79 #ifdef CONFIG_IPV6_PRIVACY
80 #include <linux/random.h>
81 #endif
82
83 #include <asm/uaccess.h>
84 #include <asm/unaligned.h>
85
86 #include <linux/proc_fs.h>
87 #include <linux/seq_file.h>
88
89 /* Set to 3 to get tracing... */
90 #define ACONF_DEBUG 2
91
92 #if ACONF_DEBUG >= 3
93 #define ADBG(x) printk x
94 #else
95 #define ADBG(x)
96 #endif
97
98 #define INFINITY_LIFE_TIME 0xFFFFFFFF
99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
100
101 #ifdef CONFIG_SYSCTL
102 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
103 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
104 #endif
105
106 #ifdef CONFIG_IPV6_PRIVACY
107 static int __ipv6_regen_rndid(struct inet6_dev *idev);
108 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
109 static void ipv6_regen_rndid(unsigned long data);
110
111 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
112 #endif
113
114 static int ipv6_count_addresses(struct inet6_dev *idev);
115
116 /*
117 * Configured unicast address hash table
118 */
119 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
120 static DEFINE_RWLOCK(addrconf_hash_lock);
121
122 static void addrconf_verify(unsigned long);
123
124 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
125 static DEFINE_SPINLOCK(addrconf_verify_lock);
126
127 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
128 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
129
130 static int addrconf_ifdown(struct net_device *dev, int how);
131
132 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
133 static void addrconf_dad_timer(unsigned long data);
134 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
135 static void addrconf_dad_run(struct inet6_dev *idev);
136 static void addrconf_rs_timer(unsigned long data);
137 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
138 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
139
140 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
141 struct prefix_info *pinfo);
142 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
143
144 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
145
146 struct ipv6_devconf ipv6_devconf __read_mostly = {
147 .forwarding = 0,
148 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
149 .mtu6 = IPV6_MIN_MTU,
150 .accept_ra = 1,
151 .accept_redirects = 1,
152 .autoconf = 1,
153 .force_mld_version = 0,
154 .dad_transmits = 1,
155 .rtr_solicits = MAX_RTR_SOLICITATIONS,
156 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
157 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
158 #ifdef CONFIG_IPV6_PRIVACY
159 .use_tempaddr = 0,
160 .temp_valid_lft = TEMP_VALID_LIFETIME,
161 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
162 .regen_max_retry = REGEN_MAX_RETRY,
163 .max_desync_factor = MAX_DESYNC_FACTOR,
164 #endif
165 .max_addresses = IPV6_MAX_ADDRESSES,
166 .accept_ra_defrtr = 1,
167 .accept_ra_pinfo = 1,
168 #ifdef CONFIG_IPV6_ROUTER_PREF
169 .accept_ra_rtr_pref = 1,
170 .rtr_probe_interval = 60 * HZ,
171 #ifdef CONFIG_IPV6_ROUTE_INFO
172 .accept_ra_rt_info_max_plen = 0,
173 #endif
174 #endif
175 .proxy_ndp = 0,
176 .accept_source_route = 0, /* we do not accept RH0 by default. */
177 };
178
179 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
180 .forwarding = 0,
181 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
182 .mtu6 = IPV6_MIN_MTU,
183 .accept_ra = 1,
184 .accept_redirects = 1,
185 .autoconf = 1,
186 .dad_transmits = 1,
187 .rtr_solicits = MAX_RTR_SOLICITATIONS,
188 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
189 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
190 #ifdef CONFIG_IPV6_PRIVACY
191 .use_tempaddr = 0,
192 .temp_valid_lft = TEMP_VALID_LIFETIME,
193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
194 .regen_max_retry = REGEN_MAX_RETRY,
195 .max_desync_factor = MAX_DESYNC_FACTOR,
196 #endif
197 .max_addresses = IPV6_MAX_ADDRESSES,
198 .accept_ra_defrtr = 1,
199 .accept_ra_pinfo = 1,
200 #ifdef CONFIG_IPV6_ROUTER_PREF
201 .accept_ra_rtr_pref = 1,
202 .rtr_probe_interval = 60 * HZ,
203 #ifdef CONFIG_IPV6_ROUTE_INFO
204 .accept_ra_rt_info_max_plen = 0,
205 #endif
206 #endif
207 .proxy_ndp = 0,
208 .accept_source_route = 0, /* we do not accept RH0 by default. */
209 };
210
211 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
212 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
213 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
214
215 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
216 {
217 if (del_timer(&ifp->timer))
218 __in6_ifa_put(ifp);
219 }
220
221 enum addrconf_timer_t
222 {
223 AC_NONE,
224 AC_DAD,
225 AC_RS,
226 };
227
228 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
229 enum addrconf_timer_t what,
230 unsigned long when)
231 {
232 if (!del_timer(&ifp->timer))
233 in6_ifa_hold(ifp);
234
235 switch (what) {
236 case AC_DAD:
237 ifp->timer.function = addrconf_dad_timer;
238 break;
239 case AC_RS:
240 ifp->timer.function = addrconf_rs_timer;
241 break;
242 default:;
243 }
244 ifp->timer.expires = jiffies + when;
245 add_timer(&ifp->timer);
246 }
247
248 static int snmp6_alloc_dev(struct inet6_dev *idev)
249 {
250 int err = -ENOMEM;
251
252 if (!idev || !idev->dev)
253 return -EINVAL;
254
255 if (snmp_mib_init((void **)idev->stats.ipv6,
256 sizeof(struct ipstats_mib),
257 __alignof__(struct ipstats_mib)) < 0)
258 goto err_ip;
259 if (snmp_mib_init((void **)idev->stats.icmpv6,
260 sizeof(struct icmpv6_mib),
261 __alignof__(struct icmpv6_mib)) < 0)
262 goto err_icmp;
263
264 return 0;
265
266 err_icmp:
267 snmp_mib_free((void **)idev->stats.ipv6);
268 err_ip:
269 return err;
270 }
271
272 static int snmp6_free_dev(struct inet6_dev *idev)
273 {
274 snmp_mib_free((void **)idev->stats.icmpv6);
275 snmp_mib_free((void **)idev->stats.ipv6);
276 return 0;
277 }
278
279 /* Nobody refers to this device, we may destroy it. */
280
281 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
282 {
283 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
284 kfree(idev);
285 }
286
287 void in6_dev_finish_destroy(struct inet6_dev *idev)
288 {
289 struct net_device *dev = idev->dev;
290 BUG_TRAP(idev->addr_list==NULL);
291 BUG_TRAP(idev->mc_list==NULL);
292 #ifdef NET_REFCNT_DEBUG
293 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
294 #endif
295 dev_put(dev);
296 if (!idev->dead) {
297 printk("Freeing alive inet6 device %p\n", idev);
298 return;
299 }
300 snmp6_free_dev(idev);
301 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
302 }
303
304 EXPORT_SYMBOL(in6_dev_finish_destroy);
305
306 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
307 {
308 struct inet6_dev *ndev;
309 struct in6_addr maddr;
310
311 ASSERT_RTNL();
312
313 if (dev->mtu < IPV6_MIN_MTU)
314 return NULL;
315
316 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
317
318 if (ndev == NULL)
319 return NULL;
320
321 rwlock_init(&ndev->lock);
322 ndev->dev = dev;
323 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
324 ndev->cnf.mtu6 = dev->mtu;
325 ndev->cnf.sysctl = NULL;
326 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
327 if (ndev->nd_parms == NULL) {
328 kfree(ndev);
329 return NULL;
330 }
331 /* We refer to the device */
332 dev_hold(dev);
333
334 if (snmp6_alloc_dev(ndev) < 0) {
335 ADBG((KERN_WARNING
336 "%s(): cannot allocate memory for statistics; dev=%s.\n",
337 __FUNCTION__, dev->name));
338 neigh_parms_release(&nd_tbl, ndev->nd_parms);
339 ndev->dead = 1;
340 in6_dev_finish_destroy(ndev);
341 return NULL;
342 }
343
344 if (snmp6_register_dev(ndev) < 0) {
345 ADBG((KERN_WARNING
346 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
347 __FUNCTION__, dev->name));
348 neigh_parms_release(&nd_tbl, ndev->nd_parms);
349 ndev->dead = 1;
350 in6_dev_finish_destroy(ndev);
351 return NULL;
352 }
353
354 /* One reference from device. We must do this before
355 * we invoke __ipv6_regen_rndid().
356 */
357 in6_dev_hold(ndev);
358
359 #ifdef CONFIG_IPV6_PRIVACY
360 init_timer(&ndev->regen_timer);
361 ndev->regen_timer.function = ipv6_regen_rndid;
362 ndev->regen_timer.data = (unsigned long) ndev;
363 if ((dev->flags&IFF_LOOPBACK) ||
364 dev->type == ARPHRD_TUNNEL ||
365 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
366 dev->type == ARPHRD_SIT ||
367 #endif
368 dev->type == ARPHRD_NONE) {
369 printk(KERN_INFO
370 "%s: Disabled Privacy Extensions\n",
371 dev->name);
372 ndev->cnf.use_tempaddr = -1;
373 } else {
374 in6_dev_hold(ndev);
375 ipv6_regen_rndid((unsigned long) ndev);
376 }
377 #endif
378
379 if (netif_running(dev) && netif_carrier_ok(dev))
380 ndev->if_flags |= IF_READY;
381
382 ipv6_mc_init_dev(ndev);
383 ndev->tstamp = jiffies;
384 #ifdef CONFIG_SYSCTL
385 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
386 NET_IPV6_NEIGH, "ipv6",
387 &ndisc_ifinfo_sysctl_change,
388 NULL);
389 addrconf_sysctl_register(ndev, &ndev->cnf);
390 #endif
391 /* protected by rtnl_lock */
392 rcu_assign_pointer(dev->ip6_ptr, ndev);
393
394 /* Join all-node multicast group */
395 ipv6_addr_all_nodes(&maddr);
396 ipv6_dev_mc_inc(dev, &maddr);
397
398 return ndev;
399 }
400
401 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
402 {
403 struct inet6_dev *idev;
404
405 ASSERT_RTNL();
406
407 if ((idev = __in6_dev_get(dev)) == NULL) {
408 if ((idev = ipv6_add_dev(dev)) == NULL)
409 return NULL;
410 }
411
412 if (dev->flags&IFF_UP)
413 ipv6_mc_up(idev);
414 return idev;
415 }
416
417 #ifdef CONFIG_SYSCTL
418 static void dev_forward_change(struct inet6_dev *idev)
419 {
420 struct net_device *dev;
421 struct inet6_ifaddr *ifa;
422 struct in6_addr addr;
423
424 if (!idev)
425 return;
426 dev = idev->dev;
427 if (dev && (dev->flags & IFF_MULTICAST)) {
428 ipv6_addr_all_routers(&addr);
429
430 if (idev->cnf.forwarding)
431 ipv6_dev_mc_inc(dev, &addr);
432 else
433 ipv6_dev_mc_dec(dev, &addr);
434 }
435 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
436 if (ifa->flags&IFA_F_TENTATIVE)
437 continue;
438 if (idev->cnf.forwarding)
439 addrconf_join_anycast(ifa);
440 else
441 addrconf_leave_anycast(ifa);
442 }
443 }
444
445
446 static void addrconf_forward_change(void)
447 {
448 struct net_device *dev;
449 struct inet6_dev *idev;
450
451 read_lock(&dev_base_lock);
452 for_each_netdev(dev) {
453 rcu_read_lock();
454 idev = __in6_dev_get(dev);
455 if (idev) {
456 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
457 idev->cnf.forwarding = ipv6_devconf.forwarding;
458 if (changed)
459 dev_forward_change(idev);
460 }
461 rcu_read_unlock();
462 }
463 read_unlock(&dev_base_lock);
464 }
465 #endif
466
467 /* Nobody refers to this ifaddr, destroy it */
468
469 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
470 {
471 BUG_TRAP(ifp->if_next==NULL);
472 BUG_TRAP(ifp->lst_next==NULL);
473 #ifdef NET_REFCNT_DEBUG
474 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
475 #endif
476
477 in6_dev_put(ifp->idev);
478
479 if (del_timer(&ifp->timer))
480 printk("Timer is still running, when freeing ifa=%p\n", ifp);
481
482 if (!ifp->dead) {
483 printk("Freeing alive inet6 address %p\n", ifp);
484 return;
485 }
486 dst_release(&ifp->rt->u.dst);
487
488 kfree(ifp);
489 }
490
491 static void
492 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
493 {
494 struct inet6_ifaddr *ifa, **ifap;
495 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
496
497 /*
498 * Each device address list is sorted in order of scope -
499 * global before linklocal.
500 */
501 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
502 ifap = &ifa->if_next) {
503 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
504 break;
505 }
506
507 ifp->if_next = *ifap;
508 *ifap = ifp;
509 }
510
511 /* On success it returns ifp with increased reference count */
512
513 static struct inet6_ifaddr *
514 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
515 int scope, u32 flags)
516 {
517 struct inet6_ifaddr *ifa = NULL;
518 struct rt6_info *rt;
519 int hash;
520 int err = 0;
521
522 rcu_read_lock_bh();
523 if (idev->dead) {
524 err = -ENODEV; /*XXX*/
525 goto out2;
526 }
527
528 write_lock(&addrconf_hash_lock);
529
530 /* Ignore adding duplicate addresses on an interface */
531 if (ipv6_chk_same_addr(addr, idev->dev)) {
532 ADBG(("ipv6_add_addr: already assigned\n"));
533 err = -EEXIST;
534 goto out;
535 }
536
537 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
538
539 if (ifa == NULL) {
540 ADBG(("ipv6_add_addr: malloc failed\n"));
541 err = -ENOBUFS;
542 goto out;
543 }
544
545 rt = addrconf_dst_alloc(idev, addr, 0);
546 if (IS_ERR(rt)) {
547 err = PTR_ERR(rt);
548 goto out;
549 }
550
551 ipv6_addr_copy(&ifa->addr, addr);
552
553 spin_lock_init(&ifa->lock);
554 init_timer(&ifa->timer);
555 ifa->timer.data = (unsigned long) ifa;
556 ifa->scope = scope;
557 ifa->prefix_len = pfxlen;
558 ifa->flags = flags | IFA_F_TENTATIVE;
559 ifa->cstamp = ifa->tstamp = jiffies;
560
561 ifa->rt = rt;
562
563 /*
564 * part one of RFC 4429, section 3.3
565 * We should not configure an address as
566 * optimistic if we do not yet know the link
567 * layer address of our nexhop router
568 */
569
570 if (rt->rt6i_nexthop == NULL)
571 ifa->flags &= ~IFA_F_OPTIMISTIC;
572
573 ifa->idev = idev;
574 in6_dev_hold(idev);
575 /* For caller */
576 in6_ifa_hold(ifa);
577
578 /* Add to big hash table */
579 hash = ipv6_addr_hash(addr);
580
581 ifa->lst_next = inet6_addr_lst[hash];
582 inet6_addr_lst[hash] = ifa;
583 in6_ifa_hold(ifa);
584 write_unlock(&addrconf_hash_lock);
585
586 write_lock(&idev->lock);
587 /* Add to inet6_dev unicast addr list. */
588 ipv6_link_dev_addr(idev, ifa);
589
590 #ifdef CONFIG_IPV6_PRIVACY
591 if (ifa->flags&IFA_F_TEMPORARY) {
592 ifa->tmp_next = idev->tempaddr_list;
593 idev->tempaddr_list = ifa;
594 in6_ifa_hold(ifa);
595 }
596 #endif
597
598 in6_ifa_hold(ifa);
599 write_unlock(&idev->lock);
600 out2:
601 rcu_read_unlock_bh();
602
603 if (likely(err == 0))
604 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
605 else {
606 kfree(ifa);
607 ifa = ERR_PTR(err);
608 }
609
610 return ifa;
611 out:
612 write_unlock(&addrconf_hash_lock);
613 goto out2;
614 }
615
616 /* This function wants to get referenced ifp and releases it before return */
617
618 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
619 {
620 struct inet6_ifaddr *ifa, **ifap;
621 struct inet6_dev *idev = ifp->idev;
622 int hash;
623 int deleted = 0, onlink = 0;
624 unsigned long expires = jiffies;
625
626 hash = ipv6_addr_hash(&ifp->addr);
627
628 ifp->dead = 1;
629
630 write_lock_bh(&addrconf_hash_lock);
631 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
632 ifap = &ifa->lst_next) {
633 if (ifa == ifp) {
634 *ifap = ifa->lst_next;
635 __in6_ifa_put(ifp);
636 ifa->lst_next = NULL;
637 break;
638 }
639 }
640 write_unlock_bh(&addrconf_hash_lock);
641
642 write_lock_bh(&idev->lock);
643 #ifdef CONFIG_IPV6_PRIVACY
644 if (ifp->flags&IFA_F_TEMPORARY) {
645 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
646 ifap = &ifa->tmp_next) {
647 if (ifa == ifp) {
648 *ifap = ifa->tmp_next;
649 if (ifp->ifpub) {
650 in6_ifa_put(ifp->ifpub);
651 ifp->ifpub = NULL;
652 }
653 __in6_ifa_put(ifp);
654 ifa->tmp_next = NULL;
655 break;
656 }
657 }
658 }
659 #endif
660
661 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
662 if (ifa == ifp) {
663 *ifap = ifa->if_next;
664 __in6_ifa_put(ifp);
665 ifa->if_next = NULL;
666 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
667 break;
668 deleted = 1;
669 continue;
670 } else if (ifp->flags & IFA_F_PERMANENT) {
671 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
672 ifp->prefix_len)) {
673 if (ifa->flags & IFA_F_PERMANENT) {
674 onlink = 1;
675 if (deleted)
676 break;
677 } else {
678 unsigned long lifetime;
679
680 if (!onlink)
681 onlink = -1;
682
683 spin_lock(&ifa->lock);
684 lifetime = min_t(unsigned long,
685 ifa->valid_lft, 0x7fffffffUL/HZ);
686 if (time_before(expires,
687 ifa->tstamp + lifetime * HZ))
688 expires = ifa->tstamp + lifetime * HZ;
689 spin_unlock(&ifa->lock);
690 }
691 }
692 }
693 ifap = &ifa->if_next;
694 }
695 write_unlock_bh(&idev->lock);
696
697 ipv6_ifa_notify(RTM_DELADDR, ifp);
698
699 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
700
701 addrconf_del_timer(ifp);
702
703 /*
704 * Purge or update corresponding prefix
705 *
706 * 1) we don't purge prefix here if address was not permanent.
707 * prefix is managed by its own lifetime.
708 * 2) if there're no addresses, delete prefix.
709 * 3) if there're still other permanent address(es),
710 * corresponding prefix is still permanent.
711 * 4) otherwise, update prefix lifetime to the
712 * longest valid lifetime among the corresponding
713 * addresses on the device.
714 * Note: subsequent RA will update lifetime.
715 *
716 * --yoshfuji
717 */
718 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
719 struct in6_addr prefix;
720 struct rt6_info *rt;
721
722 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
723 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
724
725 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
726 if (onlink == 0) {
727 ip6_del_rt(rt);
728 rt = NULL;
729 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
730 rt->rt6i_expires = expires;
731 rt->rt6i_flags |= RTF_EXPIRES;
732 }
733 }
734 dst_release(&rt->u.dst);
735 }
736
737 in6_ifa_put(ifp);
738 }
739
740 #ifdef CONFIG_IPV6_PRIVACY
741 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
742 {
743 struct inet6_dev *idev = ifp->idev;
744 struct in6_addr addr, *tmpaddr;
745 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
746 int tmp_plen;
747 int ret = 0;
748 int max_addresses;
749 u32 addr_flags;
750
751 write_lock(&idev->lock);
752 if (ift) {
753 spin_lock_bh(&ift->lock);
754 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
755 spin_unlock_bh(&ift->lock);
756 tmpaddr = &addr;
757 } else {
758 tmpaddr = NULL;
759 }
760 retry:
761 in6_dev_hold(idev);
762 if (idev->cnf.use_tempaddr <= 0) {
763 write_unlock(&idev->lock);
764 printk(KERN_INFO
765 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
766 in6_dev_put(idev);
767 ret = -1;
768 goto out;
769 }
770 spin_lock_bh(&ifp->lock);
771 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
772 idev->cnf.use_tempaddr = -1; /*XXX*/
773 spin_unlock_bh(&ifp->lock);
774 write_unlock(&idev->lock);
775 printk(KERN_WARNING
776 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
777 in6_dev_put(idev);
778 ret = -1;
779 goto out;
780 }
781 in6_ifa_hold(ifp);
782 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
783 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
784 spin_unlock_bh(&ifp->lock);
785 write_unlock(&idev->lock);
786 printk(KERN_WARNING
787 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
788 in6_ifa_put(ifp);
789 in6_dev_put(idev);
790 ret = -1;
791 goto out;
792 }
793 memcpy(&addr.s6_addr[8], idev->rndid, 8);
794 tmp_valid_lft = min_t(__u32,
795 ifp->valid_lft,
796 idev->cnf.temp_valid_lft);
797 tmp_prefered_lft = min_t(__u32,
798 ifp->prefered_lft,
799 idev->cnf.temp_prefered_lft - desync_factor / HZ);
800 tmp_plen = ifp->prefix_len;
801 max_addresses = idev->cnf.max_addresses;
802 tmp_cstamp = ifp->cstamp;
803 tmp_tstamp = ifp->tstamp;
804 spin_unlock_bh(&ifp->lock);
805
806 write_unlock(&idev->lock);
807
808 addr_flags = IFA_F_TEMPORARY;
809 /* set in addrconf_prefix_rcv() */
810 if (ifp->flags & IFA_F_OPTIMISTIC)
811 addr_flags |= IFA_F_OPTIMISTIC;
812
813 ift = !max_addresses ||
814 ipv6_count_addresses(idev) < max_addresses ?
815 ipv6_add_addr(idev, &addr, tmp_plen,
816 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
817 addr_flags) : NULL;
818 if (!ift || IS_ERR(ift)) {
819 in6_ifa_put(ifp);
820 in6_dev_put(idev);
821 printk(KERN_INFO
822 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
823 tmpaddr = &addr;
824 write_lock(&idev->lock);
825 goto retry;
826 }
827
828 spin_lock_bh(&ift->lock);
829 ift->ifpub = ifp;
830 ift->valid_lft = tmp_valid_lft;
831 ift->prefered_lft = tmp_prefered_lft;
832 ift->cstamp = tmp_cstamp;
833 ift->tstamp = tmp_tstamp;
834 spin_unlock_bh(&ift->lock);
835
836 addrconf_dad_start(ift, 0);
837 in6_ifa_put(ift);
838 in6_dev_put(idev);
839 out:
840 return ret;
841 }
842 #endif
843
844 /*
845 * Choose an appropriate source address (RFC3484)
846 */
847 struct ipv6_saddr_score {
848 int addr_type;
849 unsigned int attrs;
850 int matchlen;
851 int scope;
852 unsigned int rule;
853 };
854
855 #define IPV6_SADDR_SCORE_LOCAL 0x0001
856 #define IPV6_SADDR_SCORE_PREFERRED 0x0004
857 #define IPV6_SADDR_SCORE_HOA 0x0008
858 #define IPV6_SADDR_SCORE_OIF 0x0010
859 #define IPV6_SADDR_SCORE_LABEL 0x0020
860 #define IPV6_SADDR_SCORE_PRIVACY 0x0040
861
862 static inline int ipv6_saddr_preferred(int type)
863 {
864 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
865 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
866 return 1;
867 return 0;
868 }
869
870 /* static matching label */
871 static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
872 {
873 /*
874 * prefix (longest match) label
875 * -----------------------------
876 * ::1/128 0
877 * ::/0 1
878 * 2002::/16 2
879 * ::/96 3
880 * ::ffff:0:0/96 4
881 * fc00::/7 5
882 * 2001::/32 6
883 */
884 if (type & IPV6_ADDR_LOOPBACK)
885 return 0;
886 else if (type & IPV6_ADDR_COMPATv4)
887 return 3;
888 else if (type & IPV6_ADDR_MAPPED)
889 return 4;
890 else if (addr->s6_addr32[0] == htonl(0x20010000))
891 return 6;
892 else if (addr->s6_addr16[0] == htons(0x2002))
893 return 2;
894 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
895 return 5;
896 return 1;
897 }
898
899 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
900 struct in6_addr *daddr, struct in6_addr *saddr)
901 {
902 struct ipv6_saddr_score hiscore;
903 struct inet6_ifaddr *ifa_result = NULL;
904 int daddr_type = __ipv6_addr_type(daddr);
905 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
906 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
907 struct net_device *dev;
908
909 memset(&hiscore, 0, sizeof(hiscore));
910
911 read_lock(&dev_base_lock);
912 rcu_read_lock();
913
914 for_each_netdev(dev) {
915 struct inet6_dev *idev;
916 struct inet6_ifaddr *ifa;
917
918 /* Rule 0: Candidate Source Address (section 4)
919 * - multicast and link-local destination address,
920 * the set of candidate source address MUST only
921 * include addresses assigned to interfaces
922 * belonging to the same link as the outgoing
923 * interface.
924 * (- For site-local destination addresses, the
925 * set of candidate source addresses MUST only
926 * include addresses assigned to interfaces
927 * belonging to the same site as the outgoing
928 * interface.)
929 */
930 if ((daddr_type & IPV6_ADDR_MULTICAST ||
931 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
932 daddr_dev && dev != daddr_dev)
933 continue;
934
935 idev = __in6_dev_get(dev);
936 if (!idev)
937 continue;
938
939 read_lock_bh(&idev->lock);
940 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
941 struct ipv6_saddr_score score;
942
943 score.addr_type = __ipv6_addr_type(&ifa->addr);
944
945 /* Rule 0:
946 * - Tentative Address (RFC2462 section 5.4)
947 * - A tentative address is not considered
948 * "assigned to an interface" in the traditional
949 * sense, unless it is also flagged as optimistic.
950 * - Candidate Source Address (section 4)
951 * - In any case, anycast addresses, multicast
952 * addresses, and the unspecified address MUST
953 * NOT be included in a candidate set.
954 */
955 if ((ifa->flags & IFA_F_TENTATIVE) &&
956 (!(ifa->flags & IFA_F_OPTIMISTIC)))
957 continue;
958 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
959 score.addr_type & IPV6_ADDR_MULTICAST)) {
960 LIMIT_NETDEBUG(KERN_DEBUG
961 "ADDRCONF: unspecified / multicast address"
962 "assigned as unicast address on %s",
963 dev->name);
964 continue;
965 }
966
967 score.attrs = 0;
968 score.matchlen = 0;
969 score.scope = 0;
970 score.rule = 0;
971
972 if (ifa_result == NULL) {
973 /* record it if the first available entry */
974 goto record_it;
975 }
976
977 /* Rule 1: Prefer same address */
978 if (hiscore.rule < 1) {
979 if (ipv6_addr_equal(&ifa_result->addr, daddr))
980 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
981 hiscore.rule++;
982 }
983 if (ipv6_addr_equal(&ifa->addr, daddr)) {
984 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
985 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
986 score.rule = 1;
987 goto record_it;
988 }
989 } else {
990 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
991 continue;
992 }
993
994 /* Rule 2: Prefer appropriate scope */
995 if (hiscore.rule < 2) {
996 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
997 hiscore.rule++;
998 }
999 score.scope = __ipv6_addr_src_scope(score.addr_type);
1000 if (hiscore.scope < score.scope) {
1001 if (hiscore.scope < daddr_scope) {
1002 score.rule = 2;
1003 goto record_it;
1004 } else
1005 continue;
1006 } else if (score.scope < hiscore.scope) {
1007 if (score.scope < daddr_scope)
1008 break; /* addresses sorted by scope */
1009 else {
1010 score.rule = 2;
1011 goto record_it;
1012 }
1013 }
1014
1015 /* Rule 3: Avoid deprecated and optimistic addresses */
1016 if (hiscore.rule < 3) {
1017 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1018 (((ifa_result->flags &
1019 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1020 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1021 hiscore.rule++;
1022 }
1023 if (ipv6_saddr_preferred(score.addr_type) ||
1024 (((ifa->flags &
1025 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1026 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1027 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1028 score.rule = 3;
1029 goto record_it;
1030 }
1031 } else {
1032 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1033 continue;
1034 }
1035
1036 /* Rule 4: Prefer home address */
1037 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1038 if (hiscore.rule < 4) {
1039 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1040 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1041 hiscore.rule++;
1042 }
1043 if (ifa->flags & IFA_F_HOMEADDRESS) {
1044 score.attrs |= IPV6_SADDR_SCORE_HOA;
1045 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1046 score.rule = 4;
1047 goto record_it;
1048 }
1049 } else {
1050 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1051 continue;
1052 }
1053 #else
1054 if (hiscore.rule < 4)
1055 hiscore.rule++;
1056 #endif
1057
1058 /* Rule 5: Prefer outgoing interface */
1059 if (hiscore.rule < 5) {
1060 if (daddr_dev == NULL ||
1061 daddr_dev == ifa_result->idev->dev)
1062 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1063 hiscore.rule++;
1064 }
1065 if (daddr_dev == NULL ||
1066 daddr_dev == ifa->idev->dev) {
1067 score.attrs |= IPV6_SADDR_SCORE_OIF;
1068 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1069 score.rule = 5;
1070 goto record_it;
1071 }
1072 } else {
1073 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1074 continue;
1075 }
1076
1077 /* Rule 6: Prefer matching label */
1078 if (hiscore.rule < 6) {
1079 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1080 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1081 hiscore.rule++;
1082 }
1083 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1084 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1085 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1086 score.rule = 6;
1087 goto record_it;
1088 }
1089 } else {
1090 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1091 continue;
1092 }
1093
1094 #ifdef CONFIG_IPV6_PRIVACY
1095 /* Rule 7: Prefer public address
1096 * Note: prefer temprary address if use_tempaddr >= 2
1097 */
1098 if (hiscore.rule < 7) {
1099 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1100 (ifa_result->idev->cnf.use_tempaddr >= 2))
1101 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1102 hiscore.rule++;
1103 }
1104 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1105 (ifa->idev->cnf.use_tempaddr >= 2)) {
1106 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1107 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1108 score.rule = 7;
1109 goto record_it;
1110 }
1111 } else {
1112 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1113 continue;
1114 }
1115 #else
1116 if (hiscore.rule < 7)
1117 hiscore.rule++;
1118 #endif
1119 /* Rule 8: Use longest matching prefix */
1120 if (hiscore.rule < 8) {
1121 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1122 hiscore.rule++;
1123 }
1124 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1125 if (score.matchlen > hiscore.matchlen) {
1126 score.rule = 8;
1127 goto record_it;
1128 }
1129 #if 0
1130 else if (score.matchlen < hiscore.matchlen)
1131 continue;
1132 #endif
1133
1134 /* Final Rule: choose first available one */
1135 continue;
1136 record_it:
1137 if (ifa_result)
1138 in6_ifa_put(ifa_result);
1139 in6_ifa_hold(ifa);
1140 ifa_result = ifa;
1141 hiscore = score;
1142 }
1143 read_unlock_bh(&idev->lock);
1144 }
1145 rcu_read_unlock();
1146 read_unlock(&dev_base_lock);
1147
1148 if (!ifa_result)
1149 return -EADDRNOTAVAIL;
1150
1151 ipv6_addr_copy(saddr, &ifa_result->addr);
1152 in6_ifa_put(ifa_result);
1153 return 0;
1154 }
1155
1156
1157 int ipv6_get_saddr(struct dst_entry *dst,
1158 struct in6_addr *daddr, struct in6_addr *saddr)
1159 {
1160 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1161 }
1162
1163 EXPORT_SYMBOL(ipv6_get_saddr);
1164
1165 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1166 unsigned char banned_flags)
1167 {
1168 struct inet6_dev *idev;
1169 int err = -EADDRNOTAVAIL;
1170
1171 rcu_read_lock();
1172 if ((idev = __in6_dev_get(dev)) != NULL) {
1173 struct inet6_ifaddr *ifp;
1174
1175 read_lock_bh(&idev->lock);
1176 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1177 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1178 ipv6_addr_copy(addr, &ifp->addr);
1179 err = 0;
1180 break;
1181 }
1182 }
1183 read_unlock_bh(&idev->lock);
1184 }
1185 rcu_read_unlock();
1186 return err;
1187 }
1188
1189 static int ipv6_count_addresses(struct inet6_dev *idev)
1190 {
1191 int cnt = 0;
1192 struct inet6_ifaddr *ifp;
1193
1194 read_lock_bh(&idev->lock);
1195 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1196 cnt++;
1197 read_unlock_bh(&idev->lock);
1198 return cnt;
1199 }
1200
1201 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1202 {
1203 struct inet6_ifaddr * ifp;
1204 u8 hash = ipv6_addr_hash(addr);
1205
1206 read_lock_bh(&addrconf_hash_lock);
1207 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1208 if (ipv6_addr_equal(&ifp->addr, addr) &&
1209 !(ifp->flags&IFA_F_TENTATIVE)) {
1210 if (dev == NULL || ifp->idev->dev == dev ||
1211 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1212 break;
1213 }
1214 }
1215 read_unlock_bh(&addrconf_hash_lock);
1216 return ifp != NULL;
1217 }
1218
1219 EXPORT_SYMBOL(ipv6_chk_addr);
1220
1221 static
1222 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1223 {
1224 struct inet6_ifaddr * ifp;
1225 u8 hash = ipv6_addr_hash(addr);
1226
1227 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1228 if (ipv6_addr_equal(&ifp->addr, addr)) {
1229 if (dev == NULL || ifp->idev->dev == dev)
1230 break;
1231 }
1232 }
1233 return ifp != NULL;
1234 }
1235
1236 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1237 {
1238 struct inet6_ifaddr * ifp;
1239 u8 hash = ipv6_addr_hash(addr);
1240
1241 read_lock_bh(&addrconf_hash_lock);
1242 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1243 if (ipv6_addr_equal(&ifp->addr, addr)) {
1244 if (dev == NULL || ifp->idev->dev == dev ||
1245 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1246 in6_ifa_hold(ifp);
1247 break;
1248 }
1249 }
1250 }
1251 read_unlock_bh(&addrconf_hash_lock);
1252
1253 return ifp;
1254 }
1255
1256 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1257 {
1258 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1259 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1260 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1261 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1262 int sk_ipv6only = ipv6_only_sock(sk);
1263 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1264 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1265 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1266
1267 if (!sk2_rcv_saddr && !sk_ipv6only)
1268 return 1;
1269
1270 if (addr_type2 == IPV6_ADDR_ANY &&
1271 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1272 return 1;
1273
1274 if (addr_type == IPV6_ADDR_ANY &&
1275 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1276 return 1;
1277
1278 if (sk2_rcv_saddr6 &&
1279 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1280 return 1;
1281
1282 if (addr_type == IPV6_ADDR_MAPPED &&
1283 !sk2_ipv6only &&
1284 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1285 return 1;
1286
1287 return 0;
1288 }
1289
1290 /* Gets referenced address, destroys ifaddr */
1291
1292 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1293 {
1294 if (ifp->flags&IFA_F_PERMANENT) {
1295 spin_lock_bh(&ifp->lock);
1296 addrconf_del_timer(ifp);
1297 ifp->flags |= IFA_F_TENTATIVE;
1298 spin_unlock_bh(&ifp->lock);
1299 in6_ifa_put(ifp);
1300 #ifdef CONFIG_IPV6_PRIVACY
1301 } else if (ifp->flags&IFA_F_TEMPORARY) {
1302 struct inet6_ifaddr *ifpub;
1303 spin_lock_bh(&ifp->lock);
1304 ifpub = ifp->ifpub;
1305 if (ifpub) {
1306 in6_ifa_hold(ifpub);
1307 spin_unlock_bh(&ifp->lock);
1308 ipv6_create_tempaddr(ifpub, ifp);
1309 in6_ifa_put(ifpub);
1310 } else {
1311 spin_unlock_bh(&ifp->lock);
1312 }
1313 ipv6_del_addr(ifp);
1314 #endif
1315 } else
1316 ipv6_del_addr(ifp);
1317 }
1318
1319 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1320 {
1321 if (net_ratelimit())
1322 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1323 addrconf_dad_stop(ifp);
1324 }
1325
1326 /* Join to solicited addr multicast group. */
1327
1328 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1329 {
1330 struct in6_addr maddr;
1331
1332 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1333 return;
1334
1335 addrconf_addr_solict_mult(addr, &maddr);
1336 ipv6_dev_mc_inc(dev, &maddr);
1337 }
1338
1339 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1340 {
1341 struct in6_addr maddr;
1342
1343 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1344 return;
1345
1346 addrconf_addr_solict_mult(addr, &maddr);
1347 __ipv6_dev_mc_dec(idev, &maddr);
1348 }
1349
1350 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1351 {
1352 struct in6_addr addr;
1353 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1354 if (ipv6_addr_any(&addr))
1355 return;
1356 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1357 }
1358
1359 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1360 {
1361 struct in6_addr addr;
1362 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1363 if (ipv6_addr_any(&addr))
1364 return;
1365 __ipv6_dev_ac_dec(ifp->idev, &addr);
1366 }
1367
1368 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1369 {
1370 if (dev->addr_len != ETH_ALEN)
1371 return -1;
1372 memcpy(eui, dev->dev_addr, 3);
1373 memcpy(eui + 5, dev->dev_addr + 3, 3);
1374
1375 /*
1376 * The zSeries OSA network cards can be shared among various
1377 * OS instances, but the OSA cards have only one MAC address.
1378 * This leads to duplicate address conflicts in conjunction
1379 * with IPv6 if more than one instance uses the same card.
1380 *
1381 * The driver for these cards can deliver a unique 16-bit
1382 * identifier for each instance sharing the same card. It is
1383 * placed instead of 0xFFFE in the interface identifier. The
1384 * "u" bit of the interface identifier is not inverted in this
1385 * case. Hence the resulting interface identifier has local
1386 * scope according to RFC2373.
1387 */
1388 if (dev->dev_id) {
1389 eui[3] = (dev->dev_id >> 8) & 0xFF;
1390 eui[4] = dev->dev_id & 0xFF;
1391 } else {
1392 eui[3] = 0xFF;
1393 eui[4] = 0xFE;
1394 eui[0] ^= 2;
1395 }
1396 return 0;
1397 }
1398
1399 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1400 {
1401 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1402 if (dev->addr_len != ARCNET_ALEN)
1403 return -1;
1404 memset(eui, 0, 7);
1405 eui[7] = *(u8*)dev->dev_addr;
1406 return 0;
1407 }
1408
1409 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1410 {
1411 if (dev->addr_len != INFINIBAND_ALEN)
1412 return -1;
1413 memcpy(eui, dev->dev_addr + 12, 8);
1414 eui[0] |= 2;
1415 return 0;
1416 }
1417
1418 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1419 {
1420 switch (dev->type) {
1421 case ARPHRD_ETHER:
1422 case ARPHRD_FDDI:
1423 case ARPHRD_IEEE802_TR:
1424 return addrconf_ifid_eui48(eui, dev);
1425 case ARPHRD_ARCNET:
1426 return addrconf_ifid_arcnet(eui, dev);
1427 case ARPHRD_INFINIBAND:
1428 return addrconf_ifid_infiniband(eui, dev);
1429 }
1430 return -1;
1431 }
1432
1433 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1434 {
1435 int err = -1;
1436 struct inet6_ifaddr *ifp;
1437
1438 read_lock_bh(&idev->lock);
1439 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1440 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1441 memcpy(eui, ifp->addr.s6_addr+8, 8);
1442 err = 0;
1443 break;
1444 }
1445 }
1446 read_unlock_bh(&idev->lock);
1447 return err;
1448 }
1449
1450 #ifdef CONFIG_IPV6_PRIVACY
1451 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1452 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1453 {
1454 regen:
1455 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1456 idev->rndid[0] &= ~0x02;
1457
1458 /*
1459 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1460 * check if generated address is not inappropriate
1461 *
1462 * - Reserved subnet anycast (RFC 2526)
1463 * 11111101 11....11 1xxxxxxx
1464 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1465 * 00-00-5E-FE-xx-xx-xx-xx
1466 * - value 0
1467 * - XXX: already assigned to an address on the device
1468 */
1469 if (idev->rndid[0] == 0xfd &&
1470 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1471 (idev->rndid[7]&0x80))
1472 goto regen;
1473 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1474 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1475 goto regen;
1476 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1477 goto regen;
1478 }
1479
1480 return 0;
1481 }
1482
1483 static void ipv6_regen_rndid(unsigned long data)
1484 {
1485 struct inet6_dev *idev = (struct inet6_dev *) data;
1486 unsigned long expires;
1487
1488 rcu_read_lock_bh();
1489 write_lock_bh(&idev->lock);
1490
1491 if (idev->dead)
1492 goto out;
1493
1494 if (__ipv6_regen_rndid(idev) < 0)
1495 goto out;
1496
1497 expires = jiffies +
1498 idev->cnf.temp_prefered_lft * HZ -
1499 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1500 if (time_before(expires, jiffies)) {
1501 printk(KERN_WARNING
1502 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1503 idev->dev->name);
1504 goto out;
1505 }
1506
1507 if (!mod_timer(&idev->regen_timer, expires))
1508 in6_dev_hold(idev);
1509
1510 out:
1511 write_unlock_bh(&idev->lock);
1512 rcu_read_unlock_bh();
1513 in6_dev_put(idev);
1514 }
1515
1516 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1517 int ret = 0;
1518
1519 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1520 ret = __ipv6_regen_rndid(idev);
1521 return ret;
1522 }
1523 #endif
1524
1525 /*
1526 * Add prefix route.
1527 */
1528
1529 static void
1530 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1531 unsigned long expires, u32 flags)
1532 {
1533 struct fib6_config cfg = {
1534 .fc_table = RT6_TABLE_PREFIX,
1535 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1536 .fc_ifindex = dev->ifindex,
1537 .fc_expires = expires,
1538 .fc_dst_len = plen,
1539 .fc_flags = RTF_UP | flags,
1540 };
1541
1542 ipv6_addr_copy(&cfg.fc_dst, pfx);
1543
1544 /* Prevent useless cloning on PtP SIT.
1545 This thing is done here expecting that the whole
1546 class of non-broadcast devices need not cloning.
1547 */
1548 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1549 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1550 cfg.fc_flags |= RTF_NONEXTHOP;
1551 #endif
1552
1553 ip6_route_add(&cfg);
1554 }
1555
1556 /* Create "default" multicast route to the interface */
1557
1558 static void addrconf_add_mroute(struct net_device *dev)
1559 {
1560 struct fib6_config cfg = {
1561 .fc_table = RT6_TABLE_LOCAL,
1562 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1563 .fc_ifindex = dev->ifindex,
1564 .fc_dst_len = 8,
1565 .fc_flags = RTF_UP,
1566 };
1567
1568 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1569
1570 ip6_route_add(&cfg);
1571 }
1572
1573 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1574 static void sit_route_add(struct net_device *dev)
1575 {
1576 struct fib6_config cfg = {
1577 .fc_table = RT6_TABLE_MAIN,
1578 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1579 .fc_ifindex = dev->ifindex,
1580 .fc_dst_len = 96,
1581 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1582 };
1583
1584 /* prefix length - 96 bits "::d.d.d.d" */
1585 ip6_route_add(&cfg);
1586 }
1587 #endif
1588
1589 static void addrconf_add_lroute(struct net_device *dev)
1590 {
1591 struct in6_addr addr;
1592
1593 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1594 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1595 }
1596
1597 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1598 {
1599 struct inet6_dev *idev;
1600
1601 ASSERT_RTNL();
1602
1603 if ((idev = ipv6_find_idev(dev)) == NULL)
1604 return NULL;
1605
1606 /* Add default multicast route */
1607 addrconf_add_mroute(dev);
1608
1609 /* Add link local route */
1610 addrconf_add_lroute(dev);
1611 return idev;
1612 }
1613
1614 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1615 {
1616 struct prefix_info *pinfo;
1617 __u32 valid_lft;
1618 __u32 prefered_lft;
1619 int addr_type;
1620 unsigned long rt_expires;
1621 struct inet6_dev *in6_dev;
1622
1623 pinfo = (struct prefix_info *) opt;
1624
1625 if (len < sizeof(struct prefix_info)) {
1626 ADBG(("addrconf: prefix option too short\n"));
1627 return;
1628 }
1629
1630 /*
1631 * Validation checks ([ADDRCONF], page 19)
1632 */
1633
1634 addr_type = ipv6_addr_type(&pinfo->prefix);
1635
1636 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1637 return;
1638
1639 valid_lft = ntohl(pinfo->valid);
1640 prefered_lft = ntohl(pinfo->prefered);
1641
1642 if (prefered_lft > valid_lft) {
1643 if (net_ratelimit())
1644 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1645 return;
1646 }
1647
1648 in6_dev = in6_dev_get(dev);
1649
1650 if (in6_dev == NULL) {
1651 if (net_ratelimit())
1652 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1653 return;
1654 }
1655
1656 /*
1657 * Two things going on here:
1658 * 1) Add routes for on-link prefixes
1659 * 2) Configure prefixes with the auto flag set
1660 */
1661
1662 /* Avoid arithmetic overflow. Really, we could
1663 save rt_expires in seconds, likely valid_lft,
1664 but it would require division in fib gc, that it
1665 not good.
1666 */
1667 if (valid_lft >= 0x7FFFFFFF/HZ)
1668 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1669 else
1670 rt_expires = valid_lft * HZ;
1671
1672 /*
1673 * We convert this (in jiffies) to clock_t later.
1674 * Avoid arithmetic overflow there as well.
1675 * Overflow can happen only if HZ < USER_HZ.
1676 */
1677 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1678 rt_expires = 0x7FFFFFFF / USER_HZ;
1679
1680 if (pinfo->onlink) {
1681 struct rt6_info *rt;
1682 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1683
1684 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1685 if (rt->rt6i_flags&RTF_EXPIRES) {
1686 if (valid_lft == 0) {
1687 ip6_del_rt(rt);
1688 rt = NULL;
1689 } else {
1690 rt->rt6i_expires = jiffies + rt_expires;
1691 }
1692 }
1693 } else if (valid_lft) {
1694 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1695 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1696 }
1697 if (rt)
1698 dst_release(&rt->u.dst);
1699 }
1700
1701 /* Try to figure out our local address for this prefix */
1702
1703 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1704 struct inet6_ifaddr * ifp;
1705 struct in6_addr addr;
1706 int create = 0, update_lft = 0;
1707
1708 if (pinfo->prefix_len == 64) {
1709 memcpy(&addr, &pinfo->prefix, 8);
1710 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1711 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1712 in6_dev_put(in6_dev);
1713 return;
1714 }
1715 goto ok;
1716 }
1717 if (net_ratelimit())
1718 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1719 pinfo->prefix_len);
1720 in6_dev_put(in6_dev);
1721 return;
1722
1723 ok:
1724
1725 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1726
1727 if (ifp == NULL && valid_lft) {
1728 int max_addresses = in6_dev->cnf.max_addresses;
1729 u32 addr_flags = 0;
1730
1731 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1732 if (in6_dev->cnf.optimistic_dad &&
1733 !ipv6_devconf.forwarding)
1734 addr_flags = IFA_F_OPTIMISTIC;
1735 #endif
1736
1737 /* Do not allow to create too much of autoconfigured
1738 * addresses; this would be too easy way to crash kernel.
1739 */
1740 if (!max_addresses ||
1741 ipv6_count_addresses(in6_dev) < max_addresses)
1742 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1743 addr_type&IPV6_ADDR_SCOPE_MASK,
1744 addr_flags);
1745
1746 if (!ifp || IS_ERR(ifp)) {
1747 in6_dev_put(in6_dev);
1748 return;
1749 }
1750
1751 update_lft = create = 1;
1752 ifp->cstamp = jiffies;
1753 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1754 }
1755
1756 if (ifp) {
1757 int flags;
1758 unsigned long now;
1759 #ifdef CONFIG_IPV6_PRIVACY
1760 struct inet6_ifaddr *ift;
1761 #endif
1762 u32 stored_lft;
1763
1764 /* update lifetime (RFC2462 5.5.3 e) */
1765 spin_lock(&ifp->lock);
1766 now = jiffies;
1767 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1768 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1769 else
1770 stored_lft = 0;
1771 if (!update_lft && stored_lft) {
1772 if (valid_lft > MIN_VALID_LIFETIME ||
1773 valid_lft > stored_lft)
1774 update_lft = 1;
1775 else if (stored_lft <= MIN_VALID_LIFETIME) {
1776 /* valid_lft <= stored_lft is always true */
1777 /* XXX: IPsec */
1778 update_lft = 0;
1779 } else {
1780 valid_lft = MIN_VALID_LIFETIME;
1781 if (valid_lft < prefered_lft)
1782 prefered_lft = valid_lft;
1783 update_lft = 1;
1784 }
1785 }
1786
1787 if (update_lft) {
1788 ifp->valid_lft = valid_lft;
1789 ifp->prefered_lft = prefered_lft;
1790 ifp->tstamp = now;
1791 flags = ifp->flags;
1792 ifp->flags &= ~IFA_F_DEPRECATED;
1793 spin_unlock(&ifp->lock);
1794
1795 if (!(flags&IFA_F_TENTATIVE))
1796 ipv6_ifa_notify(0, ifp);
1797 } else
1798 spin_unlock(&ifp->lock);
1799
1800 #ifdef CONFIG_IPV6_PRIVACY
1801 read_lock_bh(&in6_dev->lock);
1802 /* update all temporary addresses in the list */
1803 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1804 /*
1805 * When adjusting the lifetimes of an existing
1806 * temporary address, only lower the lifetimes.
1807 * Implementations must not increase the
1808 * lifetimes of an existing temporary address
1809 * when processing a Prefix Information Option.
1810 */
1811 spin_lock(&ift->lock);
1812 flags = ift->flags;
1813 if (ift->valid_lft > valid_lft &&
1814 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1815 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1816 if (ift->prefered_lft > prefered_lft &&
1817 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1818 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1819 spin_unlock(&ift->lock);
1820 if (!(flags&IFA_F_TENTATIVE))
1821 ipv6_ifa_notify(0, ift);
1822 }
1823
1824 if (create && in6_dev->cnf.use_tempaddr > 0) {
1825 /*
1826 * When a new public address is created as described in [ADDRCONF],
1827 * also create a new temporary address.
1828 */
1829 read_unlock_bh(&in6_dev->lock);
1830 ipv6_create_tempaddr(ifp, NULL);
1831 } else {
1832 read_unlock_bh(&in6_dev->lock);
1833 }
1834 #endif
1835 in6_ifa_put(ifp);
1836 addrconf_verify(0);
1837 }
1838 }
1839 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1840 in6_dev_put(in6_dev);
1841 }
1842
1843 /*
1844 * Set destination address.
1845 * Special case for SIT interfaces where we create a new "virtual"
1846 * device.
1847 */
1848 int addrconf_set_dstaddr(void __user *arg)
1849 {
1850 struct in6_ifreq ireq;
1851 struct net_device *dev;
1852 int err = -EINVAL;
1853
1854 rtnl_lock();
1855
1856 err = -EFAULT;
1857 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1858 goto err_exit;
1859
1860 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1861
1862 err = -ENODEV;
1863 if (dev == NULL)
1864 goto err_exit;
1865
1866 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1867 if (dev->type == ARPHRD_SIT) {
1868 struct ifreq ifr;
1869 mm_segment_t oldfs;
1870 struct ip_tunnel_parm p;
1871
1872 err = -EADDRNOTAVAIL;
1873 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1874 goto err_exit;
1875
1876 memset(&p, 0, sizeof(p));
1877 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1878 p.iph.saddr = 0;
1879 p.iph.version = 4;
1880 p.iph.ihl = 5;
1881 p.iph.protocol = IPPROTO_IPV6;
1882 p.iph.ttl = 64;
1883 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1884
1885 oldfs = get_fs(); set_fs(KERNEL_DS);
1886 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1887 set_fs(oldfs);
1888
1889 if (err == 0) {
1890 err = -ENOBUFS;
1891 if ((dev = __dev_get_by_name(p.name)) == NULL)
1892 goto err_exit;
1893 err = dev_open(dev);
1894 }
1895 }
1896 #endif
1897
1898 err_exit:
1899 rtnl_unlock();
1900 return err;
1901 }
1902
1903 /*
1904 * Manual configuration of address on an interface
1905 */
1906 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1907 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1908 {
1909 struct inet6_ifaddr *ifp;
1910 struct inet6_dev *idev;
1911 struct net_device *dev;
1912 int scope;
1913 u32 flags = RTF_EXPIRES;
1914
1915 ASSERT_RTNL();
1916
1917 /* check the lifetime */
1918 if (!valid_lft || prefered_lft > valid_lft)
1919 return -EINVAL;
1920
1921 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1922 return -ENODEV;
1923
1924 if ((idev = addrconf_add_dev(dev)) == NULL)
1925 return -ENOBUFS;
1926
1927 scope = ipv6_addr_scope(pfx);
1928
1929 if (valid_lft == INFINITY_LIFE_TIME) {
1930 ifa_flags |= IFA_F_PERMANENT;
1931 flags = 0;
1932 } else if (valid_lft >= 0x7FFFFFFF/HZ)
1933 valid_lft = 0x7FFFFFFF/HZ;
1934
1935 if (prefered_lft == 0)
1936 ifa_flags |= IFA_F_DEPRECATED;
1937 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1938 (prefered_lft != INFINITY_LIFE_TIME))
1939 prefered_lft = 0x7FFFFFFF/HZ;
1940
1941 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1942
1943 if (!IS_ERR(ifp)) {
1944 spin_lock_bh(&ifp->lock);
1945 ifp->valid_lft = valid_lft;
1946 ifp->prefered_lft = prefered_lft;
1947 ifp->tstamp = jiffies;
1948 spin_unlock_bh(&ifp->lock);
1949
1950 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1951 jiffies_to_clock_t(valid_lft * HZ), flags);
1952 /*
1953 * Note that section 3.1 of RFC 4429 indicates
1954 * that the Optimistic flag should not be set for
1955 * manually configured addresses
1956 */
1957 addrconf_dad_start(ifp, 0);
1958 in6_ifa_put(ifp);
1959 addrconf_verify(0);
1960 return 0;
1961 }
1962
1963 return PTR_ERR(ifp);
1964 }
1965
1966 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1967 {
1968 struct inet6_ifaddr *ifp;
1969 struct inet6_dev *idev;
1970 struct net_device *dev;
1971
1972 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1973 return -ENODEV;
1974
1975 if ((idev = __in6_dev_get(dev)) == NULL)
1976 return -ENXIO;
1977
1978 read_lock_bh(&idev->lock);
1979 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1980 if (ifp->prefix_len == plen &&
1981 ipv6_addr_equal(pfx, &ifp->addr)) {
1982 in6_ifa_hold(ifp);
1983 read_unlock_bh(&idev->lock);
1984
1985 ipv6_del_addr(ifp);
1986
1987 /* If the last address is deleted administratively,
1988 disable IPv6 on this interface.
1989 */
1990 if (idev->addr_list == NULL)
1991 addrconf_ifdown(idev->dev, 1);
1992 return 0;
1993 }
1994 }
1995 read_unlock_bh(&idev->lock);
1996 return -EADDRNOTAVAIL;
1997 }
1998
1999
2000 int addrconf_add_ifaddr(void __user *arg)
2001 {
2002 struct in6_ifreq ireq;
2003 int err;
2004
2005 if (!capable(CAP_NET_ADMIN))
2006 return -EPERM;
2007
2008 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2009 return -EFAULT;
2010
2011 rtnl_lock();
2012 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2013 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2014 rtnl_unlock();
2015 return err;
2016 }
2017
2018 int addrconf_del_ifaddr(void __user *arg)
2019 {
2020 struct in6_ifreq ireq;
2021 int err;
2022
2023 if (!capable(CAP_NET_ADMIN))
2024 return -EPERM;
2025
2026 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2027 return -EFAULT;
2028
2029 rtnl_lock();
2030 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2031 rtnl_unlock();
2032 return err;
2033 }
2034
2035 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2036 static void sit_add_v4_addrs(struct inet6_dev *idev)
2037 {
2038 struct inet6_ifaddr * ifp;
2039 struct in6_addr addr;
2040 struct net_device *dev;
2041 int scope;
2042
2043 ASSERT_RTNL();
2044
2045 memset(&addr, 0, sizeof(struct in6_addr));
2046 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2047
2048 if (idev->dev->flags&IFF_POINTOPOINT) {
2049 addr.s6_addr32[0] = htonl(0xfe800000);
2050 scope = IFA_LINK;
2051 } else {
2052 scope = IPV6_ADDR_COMPATv4;
2053 }
2054
2055 if (addr.s6_addr32[3]) {
2056 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2057 if (!IS_ERR(ifp)) {
2058 spin_lock_bh(&ifp->lock);
2059 ifp->flags &= ~IFA_F_TENTATIVE;
2060 spin_unlock_bh(&ifp->lock);
2061 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2062 in6_ifa_put(ifp);
2063 }
2064 return;
2065 }
2066
2067 for_each_netdev(dev) {
2068 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2069 if (in_dev && (dev->flags & IFF_UP)) {
2070 struct in_ifaddr * ifa;
2071
2072 int flag = scope;
2073
2074 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2075 int plen;
2076
2077 addr.s6_addr32[3] = ifa->ifa_local;
2078
2079 if (ifa->ifa_scope == RT_SCOPE_LINK)
2080 continue;
2081 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2082 if (idev->dev->flags&IFF_POINTOPOINT)
2083 continue;
2084 flag |= IFA_HOST;
2085 }
2086 if (idev->dev->flags&IFF_POINTOPOINT)
2087 plen = 64;
2088 else
2089 plen = 96;
2090
2091 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2092 IFA_F_PERMANENT);
2093 if (!IS_ERR(ifp)) {
2094 spin_lock_bh(&ifp->lock);
2095 ifp->flags &= ~IFA_F_TENTATIVE;
2096 spin_unlock_bh(&ifp->lock);
2097 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2098 in6_ifa_put(ifp);
2099 }
2100 }
2101 }
2102 }
2103 }
2104 #endif
2105
2106 static void init_loopback(struct net_device *dev)
2107 {
2108 struct inet6_dev *idev;
2109 struct inet6_ifaddr * ifp;
2110
2111 /* ::1 */
2112
2113 ASSERT_RTNL();
2114
2115 if ((idev = ipv6_find_idev(dev)) == NULL) {
2116 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2117 return;
2118 }
2119
2120 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, 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 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2131 {
2132 struct inet6_ifaddr * ifp;
2133 u32 addr_flags = IFA_F_PERMANENT;
2134
2135 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2136 if (idev->cnf.optimistic_dad &&
2137 !ipv6_devconf.forwarding)
2138 addr_flags |= IFA_F_OPTIMISTIC;
2139 #endif
2140
2141
2142 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2143 if (!IS_ERR(ifp)) {
2144 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2145 addrconf_dad_start(ifp, 0);
2146 in6_ifa_put(ifp);
2147 }
2148 }
2149
2150 static void addrconf_dev_config(struct net_device *dev)
2151 {
2152 struct in6_addr addr;
2153 struct inet6_dev * idev;
2154
2155 ASSERT_RTNL();
2156
2157 if ((dev->type != ARPHRD_ETHER) &&
2158 (dev->type != ARPHRD_FDDI) &&
2159 (dev->type != ARPHRD_IEEE802_TR) &&
2160 (dev->type != ARPHRD_ARCNET) &&
2161 (dev->type != ARPHRD_INFINIBAND)) {
2162 /* Alas, we support only Ethernet autoconfiguration. */
2163 return;
2164 }
2165
2166 idev = addrconf_add_dev(dev);
2167 if (idev == NULL)
2168 return;
2169
2170 memset(&addr, 0, sizeof(struct in6_addr));
2171 addr.s6_addr32[0] = htonl(0xFE800000);
2172
2173 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2174 addrconf_add_linklocal(idev, &addr);
2175 }
2176
2177 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2178 static void addrconf_sit_config(struct net_device *dev)
2179 {
2180 struct inet6_dev *idev;
2181
2182 ASSERT_RTNL();
2183
2184 /*
2185 * Configure the tunnel with one of our IPv4
2186 * addresses... we should configure all of
2187 * our v4 addrs in the tunnel
2188 */
2189
2190 if ((idev = ipv6_find_idev(dev)) == NULL) {
2191 printk(KERN_DEBUG "init sit: add_dev failed\n");
2192 return;
2193 }
2194
2195 sit_add_v4_addrs(idev);
2196
2197 if (dev->flags&IFF_POINTOPOINT) {
2198 addrconf_add_mroute(dev);
2199 addrconf_add_lroute(dev);
2200 } else
2201 sit_route_add(dev);
2202 }
2203 #endif
2204
2205 static inline int
2206 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2207 {
2208 struct in6_addr lladdr;
2209
2210 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2211 addrconf_add_linklocal(idev, &lladdr);
2212 return 0;
2213 }
2214 return -1;
2215 }
2216
2217 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2218 {
2219 struct net_device *link_dev;
2220
2221 /* first try to inherit the link-local address from the link device */
2222 if (idev->dev->iflink &&
2223 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2224 if (!ipv6_inherit_linklocal(idev, link_dev))
2225 return;
2226 }
2227 /* then try to inherit it from any device */
2228 for_each_netdev(link_dev) {
2229 if (!ipv6_inherit_linklocal(idev, link_dev))
2230 return;
2231 }
2232 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2233 }
2234
2235 /*
2236 * Autoconfigure tunnel with a link-local address so routing protocols,
2237 * DHCPv6, MLD etc. can be run over the virtual link
2238 */
2239
2240 static void addrconf_ip6_tnl_config(struct net_device *dev)
2241 {
2242 struct inet6_dev *idev;
2243
2244 ASSERT_RTNL();
2245
2246 if ((idev = addrconf_add_dev(dev)) == NULL) {
2247 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2248 return;
2249 }
2250 ip6_tnl_add_linklocal(idev);
2251 }
2252
2253 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2254 void * data)
2255 {
2256 struct net_device *dev = (struct net_device *) data;
2257 struct inet6_dev *idev = __in6_dev_get(dev);
2258 int run_pending = 0;
2259 int err;
2260
2261 switch(event) {
2262 case NETDEV_REGISTER:
2263 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2264 idev = ipv6_add_dev(dev);
2265 if (!idev)
2266 return notifier_from_errno(-ENOMEM);
2267 }
2268 break;
2269 case NETDEV_UP:
2270 case NETDEV_CHANGE:
2271 if (dev->flags & IFF_SLAVE)
2272 break;
2273
2274 if (event == NETDEV_UP) {
2275 if (!netif_carrier_ok(dev)) {
2276 /* device is not ready yet. */
2277 printk(KERN_INFO
2278 "ADDRCONF(NETDEV_UP): %s: "
2279 "link is not ready\n",
2280 dev->name);
2281 break;
2282 }
2283
2284 if (idev)
2285 idev->if_flags |= IF_READY;
2286 } else {
2287 if (!netif_carrier_ok(dev)) {
2288 /* device is still not ready. */
2289 break;
2290 }
2291
2292 if (idev) {
2293 if (idev->if_flags & IF_READY) {
2294 /* device is already configured. */
2295 break;
2296 }
2297 idev->if_flags |= IF_READY;
2298 }
2299
2300 printk(KERN_INFO
2301 "ADDRCONF(NETDEV_CHANGE): %s: "
2302 "link becomes ready\n",
2303 dev->name);
2304
2305 run_pending = 1;
2306 }
2307
2308 switch(dev->type) {
2309 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2310 case ARPHRD_SIT:
2311 addrconf_sit_config(dev);
2312 break;
2313 #endif
2314 case ARPHRD_TUNNEL6:
2315 addrconf_ip6_tnl_config(dev);
2316 break;
2317 case ARPHRD_LOOPBACK:
2318 init_loopback(dev);
2319 break;
2320
2321 default:
2322 addrconf_dev_config(dev);
2323 break;
2324 }
2325 if (idev) {
2326 if (run_pending)
2327 addrconf_dad_run(idev);
2328
2329 /* If the MTU changed during the interface down, when the
2330 interface up, the changed MTU must be reflected in the
2331 idev as well as routers.
2332 */
2333 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2334 rt6_mtu_change(dev, dev->mtu);
2335 idev->cnf.mtu6 = dev->mtu;
2336 }
2337 idev->tstamp = jiffies;
2338 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2339 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2340 stop IPv6 on this interface.
2341 */
2342 if (dev->mtu < IPV6_MIN_MTU)
2343 addrconf_ifdown(dev, event != NETDEV_DOWN);
2344 }
2345 break;
2346
2347 case NETDEV_CHANGEMTU:
2348 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2349 rt6_mtu_change(dev, dev->mtu);
2350 idev->cnf.mtu6 = dev->mtu;
2351 break;
2352 }
2353
2354 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2355
2356 case NETDEV_DOWN:
2357 case NETDEV_UNREGISTER:
2358 /*
2359 * Remove all addresses from this interface.
2360 */
2361 addrconf_ifdown(dev, event != NETDEV_DOWN);
2362 break;
2363
2364 case NETDEV_CHANGENAME:
2365 if (idev) {
2366 snmp6_unregister_dev(idev);
2367 #ifdef CONFIG_SYSCTL
2368 addrconf_sysctl_unregister(&idev->cnf);
2369 neigh_sysctl_unregister(idev->nd_parms);
2370 neigh_sysctl_register(dev, idev->nd_parms,
2371 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2372 &ndisc_ifinfo_sysctl_change,
2373 NULL);
2374 addrconf_sysctl_register(idev, &idev->cnf);
2375 #endif
2376 err = snmp6_register_dev(idev);
2377 if (err)
2378 return notifier_from_errno(err);
2379 }
2380 break;
2381 }
2382
2383 return NOTIFY_OK;
2384 }
2385
2386 /*
2387 * addrconf module should be notified of a device going up
2388 */
2389 static struct notifier_block ipv6_dev_notf = {
2390 .notifier_call = addrconf_notify,
2391 .priority = 0
2392 };
2393
2394 static int addrconf_ifdown(struct net_device *dev, int how)
2395 {
2396 struct inet6_dev *idev;
2397 struct inet6_ifaddr *ifa, **bifa;
2398 int i;
2399
2400 ASSERT_RTNL();
2401
2402 if (dev == &loopback_dev && how == 1)
2403 how = 0;
2404
2405 rt6_ifdown(dev);
2406 neigh_ifdown(&nd_tbl, dev);
2407
2408 idev = __in6_dev_get(dev);
2409 if (idev == NULL)
2410 return -ENODEV;
2411
2412 /* Step 1: remove reference to ipv6 device from parent device.
2413 Do not dev_put!
2414 */
2415 if (how == 1) {
2416 idev->dead = 1;
2417
2418 /* protected by rtnl_lock */
2419 rcu_assign_pointer(dev->ip6_ptr, NULL);
2420
2421 /* Step 1.5: remove snmp6 entry */
2422 snmp6_unregister_dev(idev);
2423
2424 }
2425
2426 /* Step 2: clear hash table */
2427 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2428 bifa = &inet6_addr_lst[i];
2429
2430 write_lock_bh(&addrconf_hash_lock);
2431 while ((ifa = *bifa) != NULL) {
2432 if (ifa->idev == idev) {
2433 *bifa = ifa->lst_next;
2434 ifa->lst_next = NULL;
2435 addrconf_del_timer(ifa);
2436 in6_ifa_put(ifa);
2437 continue;
2438 }
2439 bifa = &ifa->lst_next;
2440 }
2441 write_unlock_bh(&addrconf_hash_lock);
2442 }
2443
2444 write_lock_bh(&idev->lock);
2445
2446 /* Step 3: clear flags for stateless addrconf */
2447 if (how != 1)
2448 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2449
2450 /* Step 4: clear address list */
2451 #ifdef CONFIG_IPV6_PRIVACY
2452 if (how == 1 && del_timer(&idev->regen_timer))
2453 in6_dev_put(idev);
2454
2455 /* clear tempaddr list */
2456 while ((ifa = idev->tempaddr_list) != NULL) {
2457 idev->tempaddr_list = ifa->tmp_next;
2458 ifa->tmp_next = NULL;
2459 ifa->dead = 1;
2460 write_unlock_bh(&idev->lock);
2461 spin_lock_bh(&ifa->lock);
2462
2463 if (ifa->ifpub) {
2464 in6_ifa_put(ifa->ifpub);
2465 ifa->ifpub = NULL;
2466 }
2467 spin_unlock_bh(&ifa->lock);
2468 in6_ifa_put(ifa);
2469 write_lock_bh(&idev->lock);
2470 }
2471 #endif
2472 while ((ifa = idev->addr_list) != NULL) {
2473 idev->addr_list = ifa->if_next;
2474 ifa->if_next = NULL;
2475 ifa->dead = 1;
2476 addrconf_del_timer(ifa);
2477 write_unlock_bh(&idev->lock);
2478
2479 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2480 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2481 in6_ifa_put(ifa);
2482
2483 write_lock_bh(&idev->lock);
2484 }
2485 write_unlock_bh(&idev->lock);
2486
2487 /* Step 5: Discard multicast list */
2488
2489 if (how == 1)
2490 ipv6_mc_destroy_dev(idev);
2491 else
2492 ipv6_mc_down(idev);
2493
2494 /* Step 5: netlink notification of this interface */
2495 idev->tstamp = jiffies;
2496 inet6_ifinfo_notify(RTM_DELLINK, idev);
2497
2498 /* Shot the device (if unregistered) */
2499
2500 if (how == 1) {
2501 #ifdef CONFIG_SYSCTL
2502 addrconf_sysctl_unregister(&idev->cnf);
2503 neigh_sysctl_unregister(idev->nd_parms);
2504 #endif
2505 neigh_parms_release(&nd_tbl, idev->nd_parms);
2506 neigh_ifdown(&nd_tbl, dev);
2507 in6_dev_put(idev);
2508 }
2509 return 0;
2510 }
2511
2512 static void addrconf_rs_timer(unsigned long data)
2513 {
2514 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2515
2516 if (ifp->idev->cnf.forwarding)
2517 goto out;
2518
2519 if (ifp->idev->if_flags & IF_RA_RCVD) {
2520 /*
2521 * Announcement received after solicitation
2522 * was sent
2523 */
2524 goto out;
2525 }
2526
2527 spin_lock(&ifp->lock);
2528 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2529 struct in6_addr all_routers;
2530
2531 /* The wait after the last probe can be shorter */
2532 addrconf_mod_timer(ifp, AC_RS,
2533 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2534 ifp->idev->cnf.rtr_solicit_delay :
2535 ifp->idev->cnf.rtr_solicit_interval);
2536 spin_unlock(&ifp->lock);
2537
2538 ipv6_addr_all_routers(&all_routers);
2539
2540 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2541 } else {
2542 spin_unlock(&ifp->lock);
2543 /*
2544 * Note: we do not support deprecated "all on-link"
2545 * assumption any longer.
2546 */
2547 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2548 ifp->idev->dev->name);
2549 }
2550
2551 out:
2552 in6_ifa_put(ifp);
2553 }
2554
2555 /*
2556 * Duplicate Address Detection
2557 */
2558 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2559 {
2560 unsigned long rand_num;
2561 struct inet6_dev *idev = ifp->idev;
2562
2563 if (ifp->flags & IFA_F_OPTIMISTIC)
2564 rand_num = 0;
2565 else
2566 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2567
2568 ifp->probes = idev->cnf.dad_transmits;
2569 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2570 }
2571
2572 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2573 {
2574 struct inet6_dev *idev = ifp->idev;
2575 struct net_device *dev = idev->dev;
2576
2577 addrconf_join_solict(dev, &ifp->addr);
2578
2579 net_srandom(ifp->addr.s6_addr32[3]);
2580
2581 read_lock_bh(&idev->lock);
2582 if (ifp->dead)
2583 goto out;
2584 spin_lock_bh(&ifp->lock);
2585
2586 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2587 !(ifp->flags&IFA_F_TENTATIVE) ||
2588 ifp->flags & IFA_F_NODAD) {
2589 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2590 spin_unlock_bh(&ifp->lock);
2591 read_unlock_bh(&idev->lock);
2592
2593 addrconf_dad_completed(ifp);
2594 return;
2595 }
2596
2597 if (!(idev->if_flags & IF_READY)) {
2598 spin_unlock_bh(&ifp->lock);
2599 read_unlock_bh(&idev->lock);
2600 /*
2601 * If the defice is not ready:
2602 * - keep it tentative if it is a permanent address.
2603 * - otherwise, kill it.
2604 */
2605 in6_ifa_hold(ifp);
2606 addrconf_dad_stop(ifp);
2607 return;
2608 }
2609
2610 /*
2611 * Optimistic nodes can start receiving
2612 * Frames right away
2613 */
2614 if(ifp->flags & IFA_F_OPTIMISTIC)
2615 ip6_ins_rt(ifp->rt);
2616
2617 addrconf_dad_kick(ifp);
2618 spin_unlock_bh(&ifp->lock);
2619 out:
2620 read_unlock_bh(&idev->lock);
2621 }
2622
2623 static void addrconf_dad_timer(unsigned long data)
2624 {
2625 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2626 struct inet6_dev *idev = ifp->idev;
2627 struct in6_addr unspec;
2628 struct in6_addr mcaddr;
2629
2630 read_lock_bh(&idev->lock);
2631 if (idev->dead) {
2632 read_unlock_bh(&idev->lock);
2633 goto out;
2634 }
2635 spin_lock_bh(&ifp->lock);
2636 if (ifp->probes == 0) {
2637 /*
2638 * DAD was successful
2639 */
2640
2641 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2642 spin_unlock_bh(&ifp->lock);
2643 read_unlock_bh(&idev->lock);
2644
2645 addrconf_dad_completed(ifp);
2646
2647 goto out;
2648 }
2649
2650 ifp->probes--;
2651 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2652 spin_unlock_bh(&ifp->lock);
2653 read_unlock_bh(&idev->lock);
2654
2655 /* send a neighbour solicitation for our addr */
2656 memset(&unspec, 0, sizeof(unspec));
2657 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2658 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2659 out:
2660 in6_ifa_put(ifp);
2661 }
2662
2663 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2664 {
2665 struct net_device * dev = ifp->idev->dev;
2666
2667 /*
2668 * Configure the address for reception. Now it is valid.
2669 */
2670
2671 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2672
2673 /* If added prefix is link local and forwarding is off,
2674 start sending router solicitations.
2675 */
2676
2677 if (ifp->idev->cnf.forwarding == 0 &&
2678 ifp->idev->cnf.rtr_solicits > 0 &&
2679 (dev->flags&IFF_LOOPBACK) == 0 &&
2680 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2681 struct in6_addr all_routers;
2682
2683 ipv6_addr_all_routers(&all_routers);
2684
2685 /*
2686 * If a host as already performed a random delay
2687 * [...] as part of DAD [...] there is no need
2688 * to delay again before sending the first RS
2689 */
2690 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2691
2692 spin_lock_bh(&ifp->lock);
2693 ifp->probes = 1;
2694 ifp->idev->if_flags |= IF_RS_SENT;
2695 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2696 spin_unlock_bh(&ifp->lock);
2697 }
2698 }
2699
2700 static void addrconf_dad_run(struct inet6_dev *idev) {
2701 struct inet6_ifaddr *ifp;
2702
2703 read_lock_bh(&idev->lock);
2704 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2705 spin_lock_bh(&ifp->lock);
2706 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2707 spin_unlock_bh(&ifp->lock);
2708 continue;
2709 }
2710 spin_unlock_bh(&ifp->lock);
2711 addrconf_dad_kick(ifp);
2712 }
2713 read_unlock_bh(&idev->lock);
2714 }
2715
2716 #ifdef CONFIG_PROC_FS
2717 struct if6_iter_state {
2718 int bucket;
2719 };
2720
2721 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2722 {
2723 struct inet6_ifaddr *ifa = NULL;
2724 struct if6_iter_state *state = seq->private;
2725
2726 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2727 ifa = inet6_addr_lst[state->bucket];
2728 if (ifa)
2729 break;
2730 }
2731 return ifa;
2732 }
2733
2734 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2735 {
2736 struct if6_iter_state *state = seq->private;
2737
2738 ifa = ifa->lst_next;
2739 try_again:
2740 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2741 ifa = inet6_addr_lst[state->bucket];
2742 goto try_again;
2743 }
2744 return ifa;
2745 }
2746
2747 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2748 {
2749 struct inet6_ifaddr *ifa = if6_get_first(seq);
2750
2751 if (ifa)
2752 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2753 --pos;
2754 return pos ? NULL : ifa;
2755 }
2756
2757 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2758 {
2759 read_lock_bh(&addrconf_hash_lock);
2760 return if6_get_idx(seq, *pos);
2761 }
2762
2763 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2764 {
2765 struct inet6_ifaddr *ifa;
2766
2767 ifa = if6_get_next(seq, v);
2768 ++*pos;
2769 return ifa;
2770 }
2771
2772 static void if6_seq_stop(struct seq_file *seq, void *v)
2773 {
2774 read_unlock_bh(&addrconf_hash_lock);
2775 }
2776
2777 static int if6_seq_show(struct seq_file *seq, void *v)
2778 {
2779 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2780 seq_printf(seq,
2781 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2782 NIP6(ifp->addr),
2783 ifp->idev->dev->ifindex,
2784 ifp->prefix_len,
2785 ifp->scope,
2786 ifp->flags,
2787 ifp->idev->dev->name);
2788 return 0;
2789 }
2790
2791 static const struct seq_operations if6_seq_ops = {
2792 .start = if6_seq_start,
2793 .next = if6_seq_next,
2794 .show = if6_seq_show,
2795 .stop = if6_seq_stop,
2796 };
2797
2798 static int if6_seq_open(struct inode *inode, struct file *file)
2799 {
2800 struct seq_file *seq;
2801 int rc = -ENOMEM;
2802 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2803
2804 if (!s)
2805 goto out;
2806
2807 rc = seq_open(file, &if6_seq_ops);
2808 if (rc)
2809 goto out_kfree;
2810
2811 seq = file->private_data;
2812 seq->private = s;
2813 out:
2814 return rc;
2815 out_kfree:
2816 kfree(s);
2817 goto out;
2818 }
2819
2820 static const struct file_operations if6_fops = {
2821 .owner = THIS_MODULE,
2822 .open = if6_seq_open,
2823 .read = seq_read,
2824 .llseek = seq_lseek,
2825 .release = seq_release_private,
2826 };
2827
2828 int __init if6_proc_init(void)
2829 {
2830 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2831 return -ENOMEM;
2832 return 0;
2833 }
2834
2835 void if6_proc_exit(void)
2836 {
2837 proc_net_remove("if_inet6");
2838 }
2839 #endif /* CONFIG_PROC_FS */
2840
2841 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2842 /* Check if address is a home address configured on any interface. */
2843 int ipv6_chk_home_addr(struct in6_addr *addr)
2844 {
2845 int ret = 0;
2846 struct inet6_ifaddr * ifp;
2847 u8 hash = ipv6_addr_hash(addr);
2848 read_lock_bh(&addrconf_hash_lock);
2849 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2850 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2851 (ifp->flags & IFA_F_HOMEADDRESS)) {
2852 ret = 1;
2853 break;
2854 }
2855 }
2856 read_unlock_bh(&addrconf_hash_lock);
2857 return ret;
2858 }
2859 #endif
2860
2861 /*
2862 * Periodic address status verification
2863 */
2864
2865 static void addrconf_verify(unsigned long foo)
2866 {
2867 struct inet6_ifaddr *ifp;
2868 unsigned long now, next;
2869 int i;
2870
2871 spin_lock_bh(&addrconf_verify_lock);
2872 now = jiffies;
2873 next = now + ADDR_CHECK_FREQUENCY;
2874
2875 del_timer(&addr_chk_timer);
2876
2877 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2878
2879 restart:
2880 read_lock(&addrconf_hash_lock);
2881 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2882 unsigned long age;
2883 #ifdef CONFIG_IPV6_PRIVACY
2884 unsigned long regen_advance;
2885 #endif
2886
2887 if (ifp->flags & IFA_F_PERMANENT)
2888 continue;
2889
2890 spin_lock(&ifp->lock);
2891 age = (now - ifp->tstamp) / HZ;
2892
2893 #ifdef CONFIG_IPV6_PRIVACY
2894 regen_advance = ifp->idev->cnf.regen_max_retry *
2895 ifp->idev->cnf.dad_transmits *
2896 ifp->idev->nd_parms->retrans_time / HZ;
2897 #endif
2898
2899 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2900 age >= ifp->valid_lft) {
2901 spin_unlock(&ifp->lock);
2902 in6_ifa_hold(ifp);
2903 read_unlock(&addrconf_hash_lock);
2904 ipv6_del_addr(ifp);
2905 goto restart;
2906 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2907 spin_unlock(&ifp->lock);
2908 continue;
2909 } else if (age >= ifp->prefered_lft) {
2910 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2911 int deprecate = 0;
2912
2913 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2914 deprecate = 1;
2915 ifp->flags |= IFA_F_DEPRECATED;
2916 }
2917
2918 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2919 next = ifp->tstamp + ifp->valid_lft * HZ;
2920
2921 spin_unlock(&ifp->lock);
2922
2923 if (deprecate) {
2924 in6_ifa_hold(ifp);
2925 read_unlock(&addrconf_hash_lock);
2926
2927 ipv6_ifa_notify(0, ifp);
2928 in6_ifa_put(ifp);
2929 goto restart;
2930 }
2931 #ifdef CONFIG_IPV6_PRIVACY
2932 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2933 !(ifp->flags&IFA_F_TENTATIVE)) {
2934 if (age >= ifp->prefered_lft - regen_advance) {
2935 struct inet6_ifaddr *ifpub = ifp->ifpub;
2936 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2937 next = ifp->tstamp + ifp->prefered_lft * HZ;
2938 if (!ifp->regen_count && ifpub) {
2939 ifp->regen_count++;
2940 in6_ifa_hold(ifp);
2941 in6_ifa_hold(ifpub);
2942 spin_unlock(&ifp->lock);
2943 read_unlock(&addrconf_hash_lock);
2944 spin_lock(&ifpub->lock);
2945 ifpub->regen_count = 0;
2946 spin_unlock(&ifpub->lock);
2947 ipv6_create_tempaddr(ifpub, ifp);
2948 in6_ifa_put(ifpub);
2949 in6_ifa_put(ifp);
2950 goto restart;
2951 }
2952 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2953 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2954 spin_unlock(&ifp->lock);
2955 #endif
2956 } else {
2957 /* ifp->prefered_lft <= ifp->valid_lft */
2958 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2959 next = ifp->tstamp + ifp->prefered_lft * HZ;
2960 spin_unlock(&ifp->lock);
2961 }
2962 }
2963 read_unlock(&addrconf_hash_lock);
2964 }
2965
2966 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2967 add_timer(&addr_chk_timer);
2968 spin_unlock_bh(&addrconf_verify_lock);
2969 }
2970
2971 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2972 {
2973 struct in6_addr *pfx = NULL;
2974
2975 if (addr)
2976 pfx = nla_data(addr);
2977
2978 if (local) {
2979 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2980 pfx = NULL;
2981 else
2982 pfx = nla_data(local);
2983 }
2984
2985 return pfx;
2986 }
2987
2988 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
2989 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2990 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2991 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2992 };
2993
2994 static int
2995 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2996 {
2997 struct ifaddrmsg *ifm;
2998 struct nlattr *tb[IFA_MAX+1];
2999 struct in6_addr *pfx;
3000 int err;
3001
3002 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3003 if (err < 0)
3004 return err;
3005
3006 ifm = nlmsg_data(nlh);
3007 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3008 if (pfx == NULL)
3009 return -EINVAL;
3010
3011 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3012 }
3013
3014 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3015 u32 prefered_lft, u32 valid_lft)
3016 {
3017 u32 flags = RTF_EXPIRES;
3018
3019 if (!valid_lft || (prefered_lft > valid_lft))
3020 return -EINVAL;
3021
3022 if (valid_lft == INFINITY_LIFE_TIME) {
3023 ifa_flags |= IFA_F_PERMANENT;
3024 flags = 0;
3025 } else if (valid_lft >= 0x7FFFFFFF/HZ)
3026 valid_lft = 0x7FFFFFFF/HZ;
3027
3028 if (prefered_lft == 0)
3029 ifa_flags |= IFA_F_DEPRECATED;
3030 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3031 (prefered_lft != INFINITY_LIFE_TIME))
3032 prefered_lft = 0x7FFFFFFF/HZ;
3033
3034 spin_lock_bh(&ifp->lock);
3035 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3036 ifp->tstamp = jiffies;
3037 ifp->valid_lft = valid_lft;
3038 ifp->prefered_lft = prefered_lft;
3039
3040 spin_unlock_bh(&ifp->lock);
3041 if (!(ifp->flags&IFA_F_TENTATIVE))
3042 ipv6_ifa_notify(0, ifp);
3043
3044 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3045 jiffies_to_clock_t(valid_lft * HZ), flags);
3046 addrconf_verify(0);
3047
3048 return 0;
3049 }
3050
3051 static int
3052 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3053 {
3054 struct ifaddrmsg *ifm;
3055 struct nlattr *tb[IFA_MAX+1];
3056 struct in6_addr *pfx;
3057 struct inet6_ifaddr *ifa;
3058 struct net_device *dev;
3059 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3060 u8 ifa_flags;
3061 int err;
3062
3063 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3064 if (err < 0)
3065 return err;
3066
3067 ifm = nlmsg_data(nlh);
3068 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3069 if (pfx == NULL)
3070 return -EINVAL;
3071
3072 if (tb[IFA_CACHEINFO]) {
3073 struct ifa_cacheinfo *ci;
3074
3075 ci = nla_data(tb[IFA_CACHEINFO]);
3076 valid_lft = ci->ifa_valid;
3077 preferred_lft = ci->ifa_prefered;
3078 } else {
3079 preferred_lft = INFINITY_LIFE_TIME;
3080 valid_lft = INFINITY_LIFE_TIME;
3081 }
3082
3083 dev = __dev_get_by_index(ifm->ifa_index);
3084 if (dev == NULL)
3085 return -ENODEV;
3086
3087 /* We ignore other flags so far. */
3088 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3089
3090 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3091 if (ifa == NULL) {
3092 /*
3093 * It would be best to check for !NLM_F_CREATE here but
3094 * userspace alreay relies on not having to provide this.
3095 */
3096 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3097 ifa_flags, preferred_lft, valid_lft);
3098 }
3099
3100 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3101 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3102 err = -EEXIST;
3103 else
3104 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3105
3106 in6_ifa_put(ifa);
3107
3108 return err;
3109 }
3110
3111 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3112 u8 scope, int ifindex)
3113 {
3114 struct ifaddrmsg *ifm;
3115
3116 ifm = nlmsg_data(nlh);
3117 ifm->ifa_family = AF_INET6;
3118 ifm->ifa_prefixlen = prefixlen;
3119 ifm->ifa_flags = flags;
3120 ifm->ifa_scope = scope;
3121 ifm->ifa_index = ifindex;
3122 }
3123
3124 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3125 unsigned long tstamp, u32 preferred, u32 valid)
3126 {
3127 struct ifa_cacheinfo ci;
3128
3129 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3130 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3131 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3132 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3133 ci.ifa_prefered = preferred;
3134 ci.ifa_valid = valid;
3135
3136 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3137 }
3138
3139 static inline int rt_scope(int ifa_scope)
3140 {
3141 if (ifa_scope & IFA_HOST)
3142 return RT_SCOPE_HOST;
3143 else if (ifa_scope & IFA_LINK)
3144 return RT_SCOPE_LINK;
3145 else if (ifa_scope & IFA_SITE)
3146 return RT_SCOPE_SITE;
3147 else
3148 return RT_SCOPE_UNIVERSE;
3149 }
3150
3151 static inline int inet6_ifaddr_msgsize(void)
3152 {
3153 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3154 + nla_total_size(16) /* IFA_ADDRESS */
3155 + nla_total_size(sizeof(struct ifa_cacheinfo));
3156 }
3157
3158 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3159 u32 pid, u32 seq, int event, unsigned int flags)
3160 {
3161 struct nlmsghdr *nlh;
3162 u32 preferred, valid;
3163
3164 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3165 if (nlh == NULL)
3166 return -EMSGSIZE;
3167
3168 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3169 ifa->idev->dev->ifindex);
3170
3171 if (!(ifa->flags&IFA_F_PERMANENT)) {
3172 preferred = ifa->prefered_lft;
3173 valid = ifa->valid_lft;
3174 if (preferred != INFINITY_LIFE_TIME) {
3175 long tval = (jiffies - ifa->tstamp)/HZ;
3176 preferred -= tval;
3177 if (valid != INFINITY_LIFE_TIME)
3178 valid -= tval;
3179 }
3180 } else {
3181 preferred = INFINITY_LIFE_TIME;
3182 valid = INFINITY_LIFE_TIME;
3183 }
3184
3185 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3186 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3187 nlmsg_cancel(skb, nlh);
3188 return -EMSGSIZE;
3189 }
3190
3191 return nlmsg_end(skb, nlh);
3192 }
3193
3194 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3195 u32 pid, u32 seq, int event, u16 flags)
3196 {
3197 struct nlmsghdr *nlh;
3198 u8 scope = RT_SCOPE_UNIVERSE;
3199 int ifindex = ifmca->idev->dev->ifindex;
3200
3201 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3202 scope = RT_SCOPE_SITE;
3203
3204 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3205 if (nlh == NULL)
3206 return -EMSGSIZE;
3207
3208 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3209 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3210 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3211 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3212 nlmsg_cancel(skb, nlh);
3213 return -EMSGSIZE;
3214 }
3215
3216 return nlmsg_end(skb, nlh);
3217 }
3218
3219 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3220 u32 pid, u32 seq, int event, unsigned int flags)
3221 {
3222 struct nlmsghdr *nlh;
3223 u8 scope = RT_SCOPE_UNIVERSE;
3224 int ifindex = ifaca->aca_idev->dev->ifindex;
3225
3226 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3227 scope = RT_SCOPE_SITE;
3228
3229 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3230 if (nlh == NULL)
3231 return -EMSGSIZE;
3232
3233 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3234 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3235 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3236 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3237 nlmsg_cancel(skb, nlh);
3238 return -EMSGSIZE;
3239 }
3240
3241 return nlmsg_end(skb, nlh);
3242 }
3243
3244 enum addr_type_t
3245 {
3246 UNICAST_ADDR,
3247 MULTICAST_ADDR,
3248 ANYCAST_ADDR,
3249 };
3250
3251 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3252 enum addr_type_t type)
3253 {
3254 int idx, ip_idx;
3255 int s_idx, s_ip_idx;
3256 int err = 1;
3257 struct net_device *dev;
3258 struct inet6_dev *idev = NULL;
3259 struct inet6_ifaddr *ifa;
3260 struct ifmcaddr6 *ifmca;
3261 struct ifacaddr6 *ifaca;
3262
3263 s_idx = cb->args[0];
3264 s_ip_idx = ip_idx = cb->args[1];
3265
3266 idx = 0;
3267 for_each_netdev(dev) {
3268 if (idx < s_idx)
3269 goto cont;
3270 if (idx > s_idx)
3271 s_ip_idx = 0;
3272 ip_idx = 0;
3273 if ((idev = in6_dev_get(dev)) == NULL)
3274 goto cont;
3275 read_lock_bh(&idev->lock);
3276 switch (type) {
3277 case UNICAST_ADDR:
3278 /* unicast address incl. temp addr */
3279 for (ifa = idev->addr_list; ifa;
3280 ifa = ifa->if_next, ip_idx++) {
3281 if (ip_idx < s_ip_idx)
3282 continue;
3283 if ((err = inet6_fill_ifaddr(skb, ifa,
3284 NETLINK_CB(cb->skb).pid,
3285 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3286 NLM_F_MULTI)) <= 0)
3287 goto done;
3288 }
3289 break;
3290 case MULTICAST_ADDR:
3291 /* multicast address */
3292 for (ifmca = idev->mc_list; ifmca;
3293 ifmca = ifmca->next, ip_idx++) {
3294 if (ip_idx < s_ip_idx)
3295 continue;
3296 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3297 NETLINK_CB(cb->skb).pid,
3298 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3299 NLM_F_MULTI)) <= 0)
3300 goto done;
3301 }
3302 break;
3303 case ANYCAST_ADDR:
3304 /* anycast address */
3305 for (ifaca = idev->ac_list; ifaca;
3306 ifaca = ifaca->aca_next, ip_idx++) {
3307 if (ip_idx < s_ip_idx)
3308 continue;
3309 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3310 NETLINK_CB(cb->skb).pid,
3311 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3312 NLM_F_MULTI)) <= 0)
3313 goto done;
3314 }
3315 break;
3316 default:
3317 break;
3318 }
3319 read_unlock_bh(&idev->lock);
3320 in6_dev_put(idev);
3321 cont:
3322 idx++;
3323 }
3324 done:
3325 if (err <= 0) {
3326 read_unlock_bh(&idev->lock);
3327 in6_dev_put(idev);
3328 }
3329 cb->args[0] = idx;
3330 cb->args[1] = ip_idx;
3331 return skb->len;
3332 }
3333
3334 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3335 {
3336 enum addr_type_t type = UNICAST_ADDR;
3337 return inet6_dump_addr(skb, cb, type);
3338 }
3339
3340 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3341 {
3342 enum addr_type_t type = MULTICAST_ADDR;
3343 return inet6_dump_addr(skb, cb, type);
3344 }
3345
3346
3347 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3348 {
3349 enum addr_type_t type = ANYCAST_ADDR;
3350 return inet6_dump_addr(skb, cb, type);
3351 }
3352
3353 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3354 void *arg)
3355 {
3356 struct ifaddrmsg *ifm;
3357 struct nlattr *tb[IFA_MAX+1];
3358 struct in6_addr *addr = NULL;
3359 struct net_device *dev = NULL;
3360 struct inet6_ifaddr *ifa;
3361 struct sk_buff *skb;
3362 int err;
3363
3364 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3365 if (err < 0)
3366 goto errout;
3367
3368 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3369 if (addr == NULL) {
3370 err = -EINVAL;
3371 goto errout;
3372 }
3373
3374 ifm = nlmsg_data(nlh);
3375 if (ifm->ifa_index)
3376 dev = __dev_get_by_index(ifm->ifa_index);
3377
3378 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3379 err = -EADDRNOTAVAIL;
3380 goto errout;
3381 }
3382
3383 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3384 err = -ENOBUFS;
3385 goto errout_ifa;
3386 }
3387
3388 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3389 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3390 if (err < 0) {
3391 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3392 WARN_ON(err == -EMSGSIZE);
3393 kfree_skb(skb);
3394 goto errout_ifa;
3395 }
3396 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3397 errout_ifa:
3398 in6_ifa_put(ifa);
3399 errout:
3400 return err;
3401 }
3402
3403 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3404 {
3405 struct sk_buff *skb;
3406 int err = -ENOBUFS;
3407
3408 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3409 if (skb == NULL)
3410 goto errout;
3411
3412 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3413 if (err < 0) {
3414 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3415 WARN_ON(err == -EMSGSIZE);
3416 kfree_skb(skb);
3417 goto errout;
3418 }
3419 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3420 errout:
3421 if (err < 0)
3422 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3423 }
3424
3425 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3426 __s32 *array, int bytes)
3427 {
3428 BUG_ON(bytes < (DEVCONF_MAX * 4));
3429
3430 memset(array, 0, bytes);
3431 array[DEVCONF_FORWARDING] = cnf->forwarding;
3432 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3433 array[DEVCONF_MTU6] = cnf->mtu6;
3434 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3435 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3436 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3437 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3438 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3439 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3440 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3441 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3442 #ifdef CONFIG_IPV6_PRIVACY
3443 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3444 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3445 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3446 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3447 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3448 #endif
3449 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3450 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3451 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3452 #ifdef CONFIG_IPV6_ROUTER_PREF
3453 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3454 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3455 #ifdef CONFIG_IPV6_ROUTE_INFO
3456 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3457 #endif
3458 #endif
3459 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3460 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3461 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3462 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3463 #endif
3464 }
3465
3466 static inline size_t inet6_if_nlmsg_size(void)
3467 {
3468 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3469 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3470 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3471 + nla_total_size(4) /* IFLA_MTU */
3472 + nla_total_size(4) /* IFLA_LINK */
3473 + nla_total_size( /* IFLA_PROTINFO */
3474 nla_total_size(4) /* IFLA_INET6_FLAGS */
3475 + nla_total_size(sizeof(struct ifla_cacheinfo))
3476 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3477 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3478 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3479 );
3480 }
3481
3482 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3483 int bytes)
3484 {
3485 int i;
3486 int pad = bytes - sizeof(u64) * items;
3487 BUG_ON(pad < 0);
3488
3489 /* Use put_unaligned() because stats may not be aligned for u64. */
3490 put_unaligned(items, &stats[0]);
3491 for (i = 1; i < items; i++)
3492 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3493
3494 memset(&stats[items], 0, pad);
3495 }
3496
3497 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3498 int bytes)
3499 {
3500 switch(attrtype) {
3501 case IFLA_INET6_STATS:
3502 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3503 break;
3504 case IFLA_INET6_ICMP6STATS:
3505 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3506 break;
3507 }
3508 }
3509
3510 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3511 u32 pid, u32 seq, int event, unsigned int flags)
3512 {
3513 struct net_device *dev = idev->dev;
3514 struct nlattr *nla;
3515 struct ifinfomsg *hdr;
3516 struct nlmsghdr *nlh;
3517 void *protoinfo;
3518 struct ifla_cacheinfo ci;
3519
3520 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3521 if (nlh == NULL)
3522 return -EMSGSIZE;
3523
3524 hdr = nlmsg_data(nlh);
3525 hdr->ifi_family = AF_INET6;
3526 hdr->__ifi_pad = 0;
3527 hdr->ifi_type = dev->type;
3528 hdr->ifi_index = dev->ifindex;
3529 hdr->ifi_flags = dev_get_flags(dev);
3530 hdr->ifi_change = 0;
3531
3532 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3533
3534 if (dev->addr_len)
3535 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3536
3537 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3538 if (dev->ifindex != dev->iflink)
3539 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3540
3541 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3542 if (protoinfo == NULL)
3543 goto nla_put_failure;
3544
3545 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3546
3547 ci.max_reasm_len = IPV6_MAXPLEN;
3548 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3549 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3550 ci.reachable_time = idev->nd_parms->reachable_time;
3551 ci.retrans_time = idev->nd_parms->retrans_time;
3552 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3553
3554 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3555 if (nla == NULL)
3556 goto nla_put_failure;
3557 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3558
3559 /* XXX - MC not implemented */
3560
3561 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3562 if (nla == NULL)
3563 goto nla_put_failure;
3564 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3565
3566 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3567 if (nla == NULL)
3568 goto nla_put_failure;
3569 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3570
3571 nla_nest_end(skb, protoinfo);
3572 return nlmsg_end(skb, nlh);
3573
3574 nla_put_failure:
3575 nlmsg_cancel(skb, nlh);
3576 return -EMSGSIZE;
3577 }
3578
3579 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3580 {
3581 int idx, err;
3582 int s_idx = cb->args[0];
3583 struct net_device *dev;
3584 struct inet6_dev *idev;
3585
3586 read_lock(&dev_base_lock);
3587 idx = 0;
3588 for_each_netdev(dev) {
3589 if (idx < s_idx)
3590 goto cont;
3591 if ((idev = in6_dev_get(dev)) == NULL)
3592 goto cont;
3593 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3594 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3595 in6_dev_put(idev);
3596 if (err <= 0)
3597 break;
3598 cont:
3599 idx++;
3600 }
3601 read_unlock(&dev_base_lock);
3602 cb->args[0] = idx;
3603
3604 return skb->len;
3605 }
3606
3607 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3608 {
3609 struct sk_buff *skb;
3610 int err = -ENOBUFS;
3611
3612 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3613 if (skb == NULL)
3614 goto errout;
3615
3616 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3617 if (err < 0) {
3618 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3619 WARN_ON(err == -EMSGSIZE);
3620 kfree_skb(skb);
3621 goto errout;
3622 }
3623 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3624 errout:
3625 if (err < 0)
3626 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3627 }
3628
3629 static inline size_t inet6_prefix_nlmsg_size(void)
3630 {
3631 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3632 + nla_total_size(sizeof(struct in6_addr))
3633 + nla_total_size(sizeof(struct prefix_cacheinfo));
3634 }
3635
3636 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3637 struct prefix_info *pinfo, u32 pid, u32 seq,
3638 int event, unsigned int flags)
3639 {
3640 struct prefixmsg *pmsg;
3641 struct nlmsghdr *nlh;
3642 struct prefix_cacheinfo ci;
3643
3644 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3645 if (nlh == NULL)
3646 return -EMSGSIZE;
3647
3648 pmsg = nlmsg_data(nlh);
3649 pmsg->prefix_family = AF_INET6;
3650 pmsg->prefix_pad1 = 0;
3651 pmsg->prefix_pad2 = 0;
3652 pmsg->prefix_ifindex = idev->dev->ifindex;
3653 pmsg->prefix_len = pinfo->prefix_len;
3654 pmsg->prefix_type = pinfo->type;
3655 pmsg->prefix_pad3 = 0;
3656 pmsg->prefix_flags = 0;
3657 if (pinfo->onlink)
3658 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3659 if (pinfo->autoconf)
3660 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3661
3662 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3663
3664 ci.preferred_time = ntohl(pinfo->prefered);
3665 ci.valid_time = ntohl(pinfo->valid);
3666 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3667
3668 return nlmsg_end(skb, nlh);
3669
3670 nla_put_failure:
3671 nlmsg_cancel(skb, nlh);
3672 return -EMSGSIZE;
3673 }
3674
3675 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3676 struct prefix_info *pinfo)
3677 {
3678 struct sk_buff *skb;
3679 int err = -ENOBUFS;
3680
3681 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3682 if (skb == NULL)
3683 goto errout;
3684
3685 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3686 if (err < 0) {
3687 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3688 WARN_ON(err == -EMSGSIZE);
3689 kfree_skb(skb);
3690 goto errout;
3691 }
3692 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3693 errout:
3694 if (err < 0)
3695 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3696 }
3697
3698 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3699 {
3700 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3701
3702 switch (event) {
3703 case RTM_NEWADDR:
3704 /*
3705 * If the address was optimistic
3706 * we inserted the route at the start of
3707 * our DAD process, so we don't need
3708 * to do it again
3709 */
3710 if (!(ifp->rt->rt6i_node))
3711 ip6_ins_rt(ifp->rt);
3712 if (ifp->idev->cnf.forwarding)
3713 addrconf_join_anycast(ifp);
3714 break;
3715 case RTM_DELADDR:
3716 if (ifp->idev->cnf.forwarding)
3717 addrconf_leave_anycast(ifp);
3718 addrconf_leave_solict(ifp->idev, &ifp->addr);
3719 dst_hold(&ifp->rt->u.dst);
3720 if (ip6_del_rt(ifp->rt))
3721 dst_free(&ifp->rt->u.dst);
3722 break;
3723 }
3724 }
3725
3726 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3727 {
3728 rcu_read_lock_bh();
3729 if (likely(ifp->idev->dead == 0))
3730 __ipv6_ifa_notify(event, ifp);
3731 rcu_read_unlock_bh();
3732 }
3733
3734 #ifdef CONFIG_SYSCTL
3735
3736 static
3737 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3738 void __user *buffer, size_t *lenp, loff_t *ppos)
3739 {
3740 int *valp = ctl->data;
3741 int val = *valp;
3742 int ret;
3743
3744 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3745
3746 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3747 if (valp != &ipv6_devconf.forwarding) {
3748 if ((!*valp) ^ (!val)) {
3749 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3750 if (idev == NULL)
3751 return ret;
3752 dev_forward_change(idev);
3753 }
3754 } else {
3755 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3756 addrconf_forward_change();
3757 }
3758 if (*valp)
3759 rt6_purge_dflt_routers();
3760 }
3761
3762 return ret;
3763 }
3764
3765 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3766 int __user *name, int nlen,
3767 void __user *oldval,
3768 size_t __user *oldlenp,
3769 void __user *newval, size_t newlen)
3770 {
3771 int *valp = table->data;
3772 int new;
3773
3774 if (!newval || !newlen)
3775 return 0;
3776 if (newlen != sizeof(int))
3777 return -EINVAL;
3778 if (get_user(new, (int __user *)newval))
3779 return -EFAULT;
3780 if (new == *valp)
3781 return 0;
3782 if (oldval && oldlenp) {
3783 size_t len;
3784 if (get_user(len, oldlenp))
3785 return -EFAULT;
3786 if (len) {
3787 if (len > table->maxlen)
3788 len = table->maxlen;
3789 if (copy_to_user(oldval, valp, len))
3790 return -EFAULT;
3791 if (put_user(len, oldlenp))
3792 return -EFAULT;
3793 }
3794 }
3795
3796 if (valp != &ipv6_devconf_dflt.forwarding) {
3797 if (valp != &ipv6_devconf.forwarding) {
3798 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3799 int changed;
3800 if (unlikely(idev == NULL))
3801 return -ENODEV;
3802 changed = (!*valp) ^ (!new);
3803 *valp = new;
3804 if (changed)
3805 dev_forward_change(idev);
3806 } else {
3807 *valp = new;
3808 addrconf_forward_change();
3809 }
3810
3811 if (*valp)
3812 rt6_purge_dflt_routers();
3813 } else
3814 *valp = new;
3815
3816 return 1;
3817 }
3818
3819 static struct addrconf_sysctl_table
3820 {
3821 struct ctl_table_header *sysctl_header;
3822 ctl_table addrconf_vars[__NET_IPV6_MAX];
3823 ctl_table addrconf_dev[2];
3824 ctl_table addrconf_conf_dir[2];
3825 ctl_table addrconf_proto_dir[2];
3826 ctl_table addrconf_root_dir[2];
3827 } addrconf_sysctl __read_mostly = {
3828 .sysctl_header = NULL,
3829 .addrconf_vars = {
3830 {
3831 .ctl_name = NET_IPV6_FORWARDING,
3832 .procname = "forwarding",
3833 .data = &ipv6_devconf.forwarding,
3834 .maxlen = sizeof(int),
3835 .mode = 0644,
3836 .proc_handler = &addrconf_sysctl_forward,
3837 .strategy = &addrconf_sysctl_forward_strategy,
3838 },
3839 {
3840 .ctl_name = NET_IPV6_HOP_LIMIT,
3841 .procname = "hop_limit",
3842 .data = &ipv6_devconf.hop_limit,
3843 .maxlen = sizeof(int),
3844 .mode = 0644,
3845 .proc_handler = proc_dointvec,
3846 },
3847 {
3848 .ctl_name = NET_IPV6_MTU,
3849 .procname = "mtu",
3850 .data = &ipv6_devconf.mtu6,
3851 .maxlen = sizeof(int),
3852 .mode = 0644,
3853 .proc_handler = &proc_dointvec,
3854 },
3855 {
3856 .ctl_name = NET_IPV6_ACCEPT_RA,
3857 .procname = "accept_ra",
3858 .data = &ipv6_devconf.accept_ra,
3859 .maxlen = sizeof(int),
3860 .mode = 0644,
3861 .proc_handler = &proc_dointvec,
3862 },
3863 {
3864 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3865 .procname = "accept_redirects",
3866 .data = &ipv6_devconf.accept_redirects,
3867 .maxlen = sizeof(int),
3868 .mode = 0644,
3869 .proc_handler = &proc_dointvec,
3870 },
3871 {
3872 .ctl_name = NET_IPV6_AUTOCONF,
3873 .procname = "autoconf",
3874 .data = &ipv6_devconf.autoconf,
3875 .maxlen = sizeof(int),
3876 .mode = 0644,
3877 .proc_handler = &proc_dointvec,
3878 },
3879 {
3880 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3881 .procname = "dad_transmits",
3882 .data = &ipv6_devconf.dad_transmits,
3883 .maxlen = sizeof(int),
3884 .mode = 0644,
3885 .proc_handler = &proc_dointvec,
3886 },
3887 {
3888 .ctl_name = NET_IPV6_RTR_SOLICITS,
3889 .procname = "router_solicitations",
3890 .data = &ipv6_devconf.rtr_solicits,
3891 .maxlen = sizeof(int),
3892 .mode = 0644,
3893 .proc_handler = &proc_dointvec,
3894 },
3895 {
3896 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3897 .procname = "router_solicitation_interval",
3898 .data = &ipv6_devconf.rtr_solicit_interval,
3899 .maxlen = sizeof(int),
3900 .mode = 0644,
3901 .proc_handler = &proc_dointvec_jiffies,
3902 .strategy = &sysctl_jiffies,
3903 },
3904 {
3905 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3906 .procname = "router_solicitation_delay",
3907 .data = &ipv6_devconf.rtr_solicit_delay,
3908 .maxlen = sizeof(int),
3909 .mode = 0644,
3910 .proc_handler = &proc_dointvec_jiffies,
3911 .strategy = &sysctl_jiffies,
3912 },
3913 {
3914 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3915 .procname = "force_mld_version",
3916 .data = &ipv6_devconf.force_mld_version,
3917 .maxlen = sizeof(int),
3918 .mode = 0644,
3919 .proc_handler = &proc_dointvec,
3920 },
3921 #ifdef CONFIG_IPV6_PRIVACY
3922 {
3923 .ctl_name = NET_IPV6_USE_TEMPADDR,
3924 .procname = "use_tempaddr",
3925 .data = &ipv6_devconf.use_tempaddr,
3926 .maxlen = sizeof(int),
3927 .mode = 0644,
3928 .proc_handler = &proc_dointvec,
3929 },
3930 {
3931 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3932 .procname = "temp_valid_lft",
3933 .data = &ipv6_devconf.temp_valid_lft,
3934 .maxlen = sizeof(int),
3935 .mode = 0644,
3936 .proc_handler = &proc_dointvec,
3937 },
3938 {
3939 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3940 .procname = "temp_prefered_lft",
3941 .data = &ipv6_devconf.temp_prefered_lft,
3942 .maxlen = sizeof(int),
3943 .mode = 0644,
3944 .proc_handler = &proc_dointvec,
3945 },
3946 {
3947 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3948 .procname = "regen_max_retry",
3949 .data = &ipv6_devconf.regen_max_retry,
3950 .maxlen = sizeof(int),
3951 .mode = 0644,
3952 .proc_handler = &proc_dointvec,
3953 },
3954 {
3955 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3956 .procname = "max_desync_factor",
3957 .data = &ipv6_devconf.max_desync_factor,
3958 .maxlen = sizeof(int),
3959 .mode = 0644,
3960 .proc_handler = &proc_dointvec,
3961 },
3962 #endif
3963 {
3964 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3965 .procname = "max_addresses",
3966 .data = &ipv6_devconf.max_addresses,
3967 .maxlen = sizeof(int),
3968 .mode = 0644,
3969 .proc_handler = &proc_dointvec,
3970 },
3971 {
3972 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3973 .procname = "accept_ra_defrtr",
3974 .data = &ipv6_devconf.accept_ra_defrtr,
3975 .maxlen = sizeof(int),
3976 .mode = 0644,
3977 .proc_handler = &proc_dointvec,
3978 },
3979 {
3980 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3981 .procname = "accept_ra_pinfo",
3982 .data = &ipv6_devconf.accept_ra_pinfo,
3983 .maxlen = sizeof(int),
3984 .mode = 0644,
3985 .proc_handler = &proc_dointvec,
3986 },
3987 #ifdef CONFIG_IPV6_ROUTER_PREF
3988 {
3989 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3990 .procname = "accept_ra_rtr_pref",
3991 .data = &ipv6_devconf.accept_ra_rtr_pref,
3992 .maxlen = sizeof(int),
3993 .mode = 0644,
3994 .proc_handler = &proc_dointvec,
3995 },
3996 {
3997 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
3998 .procname = "router_probe_interval",
3999 .data = &ipv6_devconf.rtr_probe_interval,
4000 .maxlen = sizeof(int),
4001 .mode = 0644,
4002 .proc_handler = &proc_dointvec_jiffies,
4003 .strategy = &sysctl_jiffies,
4004 },
4005 #ifdef CONFIG_IPV6_ROUTE_INFO
4006 {
4007 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4008 .procname = "accept_ra_rt_info_max_plen",
4009 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4010 .maxlen = sizeof(int),
4011 .mode = 0644,
4012 .proc_handler = &proc_dointvec,
4013 },
4014 #endif
4015 #endif
4016 {
4017 .ctl_name = NET_IPV6_PROXY_NDP,
4018 .procname = "proxy_ndp",
4019 .data = &ipv6_devconf.proxy_ndp,
4020 .maxlen = sizeof(int),
4021 .mode = 0644,
4022 .proc_handler = &proc_dointvec,
4023 },
4024 {
4025 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4026 .procname = "accept_source_route",
4027 .data = &ipv6_devconf.accept_source_route,
4028 .maxlen = sizeof(int),
4029 .mode = 0644,
4030 .proc_handler = &proc_dointvec,
4031 },
4032 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4033 {
4034 .ctl_name = CTL_UNNUMBERED,
4035 .procname = "optimistic_dad",
4036 .data = &ipv6_devconf.optimistic_dad,
4037 .maxlen = sizeof(int),
4038 .mode = 0644,
4039 .proc_handler = &proc_dointvec,
4040
4041 },
4042 #endif
4043 {
4044 .ctl_name = 0, /* sentinel */
4045 }
4046 },
4047 .addrconf_dev = {
4048 {
4049 .ctl_name = NET_PROTO_CONF_ALL,
4050 .procname = "all",
4051 .mode = 0555,
4052 .child = addrconf_sysctl.addrconf_vars,
4053 },
4054 {
4055 .ctl_name = 0, /* sentinel */
4056 }
4057 },
4058 .addrconf_conf_dir = {
4059 {
4060 .ctl_name = NET_IPV6_CONF,
4061 .procname = "conf",
4062 .mode = 0555,
4063 .child = addrconf_sysctl.addrconf_dev,
4064 },
4065 {
4066 .ctl_name = 0, /* sentinel */
4067 }
4068 },
4069 .addrconf_proto_dir = {
4070 {
4071 .ctl_name = NET_IPV6,
4072 .procname = "ipv6",
4073 .mode = 0555,
4074 .child = addrconf_sysctl.addrconf_conf_dir,
4075 },
4076 {
4077 .ctl_name = 0, /* sentinel */
4078 }
4079 },
4080 .addrconf_root_dir = {
4081 {
4082 .ctl_name = CTL_NET,
4083 .procname = "net",
4084 .mode = 0555,
4085 .child = addrconf_sysctl.addrconf_proto_dir,
4086 },
4087 {
4088 .ctl_name = 0, /* sentinel */
4089 }
4090 },
4091 };
4092
4093 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4094 {
4095 int i;
4096 struct net_device *dev = idev ? idev->dev : NULL;
4097 struct addrconf_sysctl_table *t;
4098 char *dev_name = NULL;
4099
4100 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4101 if (t == NULL)
4102 return;
4103 for (i=0; t->addrconf_vars[i].data; i++) {
4104 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4105 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4106 }
4107 if (dev) {
4108 dev_name = dev->name;
4109 t->addrconf_dev[0].ctl_name = dev->ifindex;
4110 } else {
4111 dev_name = "default";
4112 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4113 }
4114
4115 /*
4116 * Make a copy of dev_name, because '.procname' is regarded as const
4117 * by sysctl and we wouldn't want anyone to change it under our feet
4118 * (see SIOCSIFNAME).
4119 */
4120 dev_name = kstrdup(dev_name, GFP_KERNEL);
4121 if (!dev_name)
4122 goto free;
4123
4124 t->addrconf_dev[0].procname = dev_name;
4125
4126 t->addrconf_dev[0].child = t->addrconf_vars;
4127 t->addrconf_conf_dir[0].child = t->addrconf_dev;
4128 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
4129 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
4130
4131 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
4132 if (t->sysctl_header == NULL)
4133 goto free_procname;
4134 else
4135 p->sysctl = t;
4136 return;
4137
4138 /* error path */
4139 free_procname:
4140 kfree(dev_name);
4141 free:
4142 kfree(t);
4143
4144 return;
4145 }
4146
4147 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4148 {
4149 if (p->sysctl) {
4150 struct addrconf_sysctl_table *t = p->sysctl;
4151 p->sysctl = NULL;
4152 unregister_sysctl_table(t->sysctl_header);
4153 kfree(t->addrconf_dev[0].procname);
4154 kfree(t);
4155 }
4156 }
4157
4158
4159 #endif
4160
4161 /*
4162 * Device notifier
4163 */
4164
4165 int register_inet6addr_notifier(struct notifier_block *nb)
4166 {
4167 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4168 }
4169
4170 EXPORT_SYMBOL(register_inet6addr_notifier);
4171
4172 int unregister_inet6addr_notifier(struct notifier_block *nb)
4173 {
4174 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4175 }
4176
4177 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4178
4179 /*
4180 * Init / cleanup code
4181 */
4182
4183 int __init addrconf_init(void)
4184 {
4185 int err = 0;
4186
4187 /* The addrconf netdev notifier requires that loopback_dev
4188 * has it's ipv6 private information allocated and setup
4189 * before it can bring up and give link-local addresses
4190 * to other devices which are up.
4191 *
4192 * Unfortunately, loopback_dev is not necessarily the first
4193 * entry in the global dev_base list of net devices. In fact,
4194 * it is likely to be the very last entry on that list.
4195 * So this causes the notifier registry below to try and
4196 * give link-local addresses to all devices besides loopback_dev
4197 * first, then loopback_dev, which cases all the non-loopback_dev
4198 * devices to fail to get a link-local address.
4199 *
4200 * So, as a temporary fix, allocate the ipv6 structure for
4201 * loopback_dev first by hand.
4202 * Longer term, all of the dependencies ipv6 has upon the loopback
4203 * device and it being up should be removed.
4204 */
4205 rtnl_lock();
4206 if (!ipv6_add_dev(&loopback_dev))
4207 err = -ENOMEM;
4208 rtnl_unlock();
4209 if (err)
4210 return err;
4211
4212 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4213 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4214 ip6_prohibit_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4215 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4216 #endif
4217
4218 register_netdevice_notifier(&ipv6_dev_notf);
4219
4220 addrconf_verify(0);
4221
4222 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4223 if (err < 0)
4224 goto errout;
4225
4226 /* Only the first call to __rtnl_register can fail */
4227 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4228 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4229 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4230 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4231 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4232
4233 #ifdef CONFIG_SYSCTL
4234 addrconf_sysctl.sysctl_header =
4235 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
4236 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4237 #endif
4238
4239 return 0;
4240 errout:
4241 unregister_netdevice_notifier(&ipv6_dev_notf);
4242
4243 return err;
4244 }
4245
4246 void __exit addrconf_cleanup(void)
4247 {
4248 struct net_device *dev;
4249 struct inet6_ifaddr *ifa;
4250 int i;
4251
4252 unregister_netdevice_notifier(&ipv6_dev_notf);
4253
4254 #ifdef CONFIG_SYSCTL
4255 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4256 addrconf_sysctl_unregister(&ipv6_devconf);
4257 #endif
4258
4259 rtnl_lock();
4260
4261 /*
4262 * clean dev list.
4263 */
4264
4265 for_each_netdev(dev) {
4266 if (__in6_dev_get(dev) == NULL)
4267 continue;
4268 addrconf_ifdown(dev, 1);
4269 }
4270 addrconf_ifdown(&loopback_dev, 2);
4271
4272 /*
4273 * Check hash table.
4274 */
4275
4276 write_lock_bh(&addrconf_hash_lock);
4277 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4278 for (ifa=inet6_addr_lst[i]; ifa; ) {
4279 struct inet6_ifaddr *bifa;
4280
4281 bifa = ifa;
4282 ifa = ifa->lst_next;
4283 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4284 /* Do not free it; something is wrong.
4285 Now we can investigate it with debugger.
4286 */
4287 }
4288 }
4289 write_unlock_bh(&addrconf_hash_lock);
4290
4291 del_timer(&addr_chk_timer);
4292
4293 rtnl_unlock();
4294
4295 #ifdef CONFIG_PROC_FS
4296 proc_net_remove("if_inet6");
4297 #endif
4298 }
WRT350N Kernel Patches