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[PATCH] Generic HDLC WAN drivers - disable netif_carrier_off()
[linux-2.6/libata-dev.git] / net / ipv6 / addrconf.c
blobddcf7754eec2dd69d65c3ddabf91edad39277314
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/config.h>
44 #include <linux/errno.h>
45 #include <linux/types.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/sched.h>
49 #include <linux/net.h>
50 #include <linux/in6.h>
51 #include <linux/netdevice.h>
52 #include <linux/if_arp.h>
53 #include <linux/if_arcnet.h>
54 #include <linux/if_infiniband.h>
55 #include <linux/route.h>
56 #include <linux/inetdevice.h>
57 #include <linux/init.h>
58 #ifdef CONFIG_SYSCTL
59 #include <linux/sysctl.h>
60 #endif
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 <linux/if_tunnel.h>
76 #include <linux/rtnetlink.h>
77
78 #ifdef CONFIG_IPV6_PRIVACY
79 #include <linux/random.h>
80 #include <linux/crypto.h>
81 #include <linux/scatterlist.h>
82 #endif
83
84 #include <asm/uaccess.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 static struct crypto_tfm *md5_tfm;
113 static DEFINE_SPINLOCK(md5_tfm_lock);
114 #endif
115
116 static int ipv6_count_addresses(struct inet6_dev *idev);
117
118 /*
119 * Configured unicast address hash table
120 */
121 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
122 static DEFINE_RWLOCK(addrconf_hash_lock);
123
124 /* Protects inet6 devices */
125 DEFINE_RWLOCK(addrconf_lock);
126
127 static void addrconf_verify(unsigned long);
128
129 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
130 static DEFINE_SPINLOCK(addrconf_verify_lock);
131
132 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
133 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
134
135 static int addrconf_ifdown(struct net_device *dev, int how);
136
137 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
138 static void addrconf_dad_timer(unsigned long data);
139 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
140 static void addrconf_rs_timer(unsigned long data);
141 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
142 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
143
144 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
145 struct prefix_info *pinfo);
146 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
147
148 static struct notifier_block *inet6addr_chain;
149
150 struct ipv6_devconf ipv6_devconf = {
151 .forwarding = 0,
152 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
153 .mtu6 = IPV6_MIN_MTU,
154 .accept_ra = 1,
155 .accept_redirects = 1,
156 .autoconf = 1,
157 .force_mld_version = 0,
158 .dad_transmits = 1,
159 .rtr_solicits = MAX_RTR_SOLICITATIONS,
160 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
161 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
162 #ifdef CONFIG_IPV6_PRIVACY
163 .use_tempaddr = 0,
164 .temp_valid_lft = TEMP_VALID_LIFETIME,
165 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
166 .regen_max_retry = REGEN_MAX_RETRY,
167 .max_desync_factor = MAX_DESYNC_FACTOR,
168 #endif
169 .max_addresses = IPV6_MAX_ADDRESSES,
170 };
171
172 static struct ipv6_devconf ipv6_devconf_dflt = {
173 .forwarding = 0,
174 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
175 .mtu6 = IPV6_MIN_MTU,
176 .accept_ra = 1,
177 .accept_redirects = 1,
178 .autoconf = 1,
179 .dad_transmits = 1,
180 .rtr_solicits = MAX_RTR_SOLICITATIONS,
181 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
182 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
183 #ifdef CONFIG_IPV6_PRIVACY
184 .use_tempaddr = 0,
185 .temp_valid_lft = TEMP_VALID_LIFETIME,
186 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
187 .regen_max_retry = REGEN_MAX_RETRY,
188 .max_desync_factor = MAX_DESYNC_FACTOR,
189 #endif
190 .max_addresses = IPV6_MAX_ADDRESSES,
191 };
192
193 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
194 #if 0
195 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
196 #endif
197 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
198
199 #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
200
201 static inline unsigned ipv6_addr_scope2type(unsigned scope)
202 {
203 switch(scope) {
204 case IPV6_ADDR_SCOPE_NODELOCAL:
205 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
206 IPV6_ADDR_LOOPBACK);
207 case IPV6_ADDR_SCOPE_LINKLOCAL:
208 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
209 IPV6_ADDR_LINKLOCAL);
210 case IPV6_ADDR_SCOPE_SITELOCAL:
211 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
212 IPV6_ADDR_SITELOCAL);
213 }
214 return IPV6_ADDR_SCOPE_TYPE(scope);
215 }
216
217 int __ipv6_addr_type(const struct in6_addr *addr)
218 {
219 u32 st;
220
221 st = addr->s6_addr32[0];
222
223 /* Consider all addresses with the first three bits different of
224 000 and 111 as unicasts.
225 */
226 if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
227 (st & htonl(0xE0000000)) != htonl(0xE0000000))
228 return (IPV6_ADDR_UNICAST |
229 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
230
231 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
232 /* multicast */
233 /* addr-select 3.1 */
234 return (IPV6_ADDR_MULTICAST |
235 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
236 }
237
238 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
239 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
240 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
241 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
242 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
243 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
244
245 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
246 if (addr->s6_addr32[2] == 0) {
247 if (addr->s6_addr32[3] == 0)
248 return IPV6_ADDR_ANY;
249
250 if (addr->s6_addr32[3] == htonl(0x00000001))
251 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
252 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
253
254 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
255 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
256 }
257
258 if (addr->s6_addr32[2] == htonl(0x0000ffff))
259 return (IPV6_ADDR_MAPPED |
260 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
261 }
262
263 return (IPV6_ADDR_RESERVED |
264 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
265 }
266
267 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
268 {
269 if (del_timer(&ifp->timer))
270 __in6_ifa_put(ifp);
271 }
272
273 enum addrconf_timer_t
274 {
275 AC_NONE,
276 AC_DAD,
277 AC_RS,
278 };
279
280 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
281 enum addrconf_timer_t what,
282 unsigned long when)
283 {
284 if (!del_timer(&ifp->timer))
285 in6_ifa_hold(ifp);
286
287 switch (what) {
288 case AC_DAD:
289 ifp->timer.function = addrconf_dad_timer;
290 break;
291 case AC_RS:
292 ifp->timer.function = addrconf_rs_timer;
293 break;
294 default:;
295 }
296 ifp->timer.expires = jiffies + when;
297 add_timer(&ifp->timer);
298 }
299
300 /* Nobody refers to this device, we may destroy it. */
301
302 void in6_dev_finish_destroy(struct inet6_dev *idev)
303 {
304 struct net_device *dev = idev->dev;
305 BUG_TRAP(idev->addr_list==NULL);
306 BUG_TRAP(idev->mc_list==NULL);
307 #ifdef NET_REFCNT_DEBUG
308 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
309 #endif
310 dev_put(dev);
311 if (!idev->dead) {
312 printk("Freeing alive inet6 device %p\n", idev);
313 return;
314 }
315 snmp6_free_dev(idev);
316 kfree(idev);
317 }
318
319 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
320 {
321 struct inet6_dev *ndev;
322
323 ASSERT_RTNL();
324
325 if (dev->mtu < IPV6_MIN_MTU)
326 return NULL;
327
328 ndev = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL);
329
330 if (ndev) {
331 memset(ndev, 0, sizeof(struct inet6_dev));
332
333 rwlock_init(&ndev->lock);
334 ndev->dev = dev;
335 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
336 ndev->cnf.mtu6 = dev->mtu;
337 ndev->cnf.sysctl = NULL;
338 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
339 if (ndev->nd_parms == NULL) {
340 kfree(ndev);
341 return NULL;
342 }
343 /* We refer to the device */
344 dev_hold(dev);
345
346 if (snmp6_alloc_dev(ndev) < 0) {
347 ADBG((KERN_WARNING
348 "%s(): cannot allocate memory for statistics; dev=%s.\n",
349 __FUNCTION__, dev->name));
350 neigh_parms_release(&nd_tbl, ndev->nd_parms);
351 ndev->dead = 1;
352 in6_dev_finish_destroy(ndev);
353 return NULL;
354 }
355
356 if (snmp6_register_dev(ndev) < 0) {
357 ADBG((KERN_WARNING
358 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
359 __FUNCTION__, dev->name));
360 neigh_parms_release(&nd_tbl, ndev->nd_parms);
361 ndev->dead = 1;
362 in6_dev_finish_destroy(ndev);
363 return NULL;
364 }
365
366 /* One reference from device. We must do this before
367 * we invoke __ipv6_regen_rndid().
368 */
369 in6_dev_hold(ndev);
370
371 #ifdef CONFIG_IPV6_PRIVACY
372 get_random_bytes(ndev->rndid, sizeof(ndev->rndid));
373 get_random_bytes(ndev->entropy, sizeof(ndev->entropy));
374 init_timer(&ndev->regen_timer);
375 ndev->regen_timer.function = ipv6_regen_rndid;
376 ndev->regen_timer.data = (unsigned long) ndev;
377 if ((dev->flags&IFF_LOOPBACK) ||
378 dev->type == ARPHRD_TUNNEL ||
379 dev->type == ARPHRD_NONE ||
380 dev->type == ARPHRD_SIT) {
381 printk(KERN_INFO
382 "Disabled Privacy Extensions on device %p(%s)\n",
383 dev, dev->name);
384 ndev->cnf.use_tempaddr = -1;
385 } else {
386 in6_dev_hold(ndev);
387 ipv6_regen_rndid((unsigned long) ndev);
388 }
389 #endif
390
391 write_lock_bh(&addrconf_lock);
392 dev->ip6_ptr = ndev;
393 write_unlock_bh(&addrconf_lock);
394
395 ipv6_mc_init_dev(ndev);
396 ndev->tstamp = jiffies;
397 #ifdef CONFIG_SYSCTL
398 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
399 NET_IPV6_NEIGH, "ipv6",
400 &ndisc_ifinfo_sysctl_change,
401 NULL);
402 addrconf_sysctl_register(ndev, &ndev->cnf);
403 #endif
404 }
405 return ndev;
406 }
407
408 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
409 {
410 struct inet6_dev *idev;
411
412 ASSERT_RTNL();
413
414 if ((idev = __in6_dev_get(dev)) == NULL) {
415 if ((idev = ipv6_add_dev(dev)) == NULL)
416 return NULL;
417 }
418 if (dev->flags&IFF_UP)
419 ipv6_mc_up(idev);
420 return idev;
421 }
422
423 #ifdef CONFIG_SYSCTL
424 static void dev_forward_change(struct inet6_dev *idev)
425 {
426 struct net_device *dev;
427 struct inet6_ifaddr *ifa;
428 struct in6_addr addr;
429
430 if (!idev)
431 return;
432 dev = idev->dev;
433 if (dev && (dev->flags & IFF_MULTICAST)) {
434 ipv6_addr_all_routers(&addr);
435
436 if (idev->cnf.forwarding)
437 ipv6_dev_mc_inc(dev, &addr);
438 else
439 ipv6_dev_mc_dec(dev, &addr);
440 }
441 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
442 if (idev->cnf.forwarding)
443 addrconf_join_anycast(ifa);
444 else
445 addrconf_leave_anycast(ifa);
446 }
447 }
448
449
450 static void addrconf_forward_change(void)
451 {
452 struct net_device *dev;
453 struct inet6_dev *idev;
454
455 read_lock(&dev_base_lock);
456 for (dev=dev_base; dev; dev=dev->next) {
457 read_lock(&addrconf_lock);
458 idev = __in6_dev_get(dev);
459 if (idev) {
460 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
461 idev->cnf.forwarding = ipv6_devconf.forwarding;
462 if (changed)
463 dev_forward_change(idev);
464 }
465 read_unlock(&addrconf_lock);
466 }
467 read_unlock(&dev_base_lock);
468 }
469 #endif
470
471 /* Nobody refers to this ifaddr, destroy it */
472
473 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
474 {
475 BUG_TRAP(ifp->if_next==NULL);
476 BUG_TRAP(ifp->lst_next==NULL);
477 #ifdef NET_REFCNT_DEBUG
478 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
479 #endif
480
481 in6_dev_put(ifp->idev);
482
483 if (del_timer(&ifp->timer))
484 printk("Timer is still running, when freeing ifa=%p\n", ifp);
485
486 if (!ifp->dead) {
487 printk("Freeing alive inet6 address %p\n", ifp);
488 return;
489 }
490 dst_release(&ifp->rt->u.dst);
491
492 kfree(ifp);
493 }
494
495 /* On success it returns ifp with increased reference count */
496
497 static struct inet6_ifaddr *
498 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
499 int scope, u32 flags)
500 {
501 struct inet6_ifaddr *ifa = NULL;
502 struct rt6_info *rt;
503 int hash;
504 int err = 0;
505
506 read_lock_bh(&addrconf_lock);
507 if (idev->dead) {
508 err = -ENODEV; /*XXX*/
509 goto out2;
510 }
511
512 write_lock(&addrconf_hash_lock);
513
514 /* Ignore adding duplicate addresses on an interface */
515 if (ipv6_chk_same_addr(addr, idev->dev)) {
516 ADBG(("ipv6_add_addr: already assigned\n"));
517 err = -EEXIST;
518 goto out;
519 }
520
521 ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
522
523 if (ifa == NULL) {
524 ADBG(("ipv6_add_addr: malloc failed\n"));
525 err = -ENOBUFS;
526 goto out;
527 }
528
529 rt = addrconf_dst_alloc(idev, addr, 0);
530 if (IS_ERR(rt)) {
531 err = PTR_ERR(rt);
532 goto out;
533 }
534
535 memset(ifa, 0, sizeof(struct inet6_ifaddr));
536 ipv6_addr_copy(&ifa->addr, addr);
537
538 spin_lock_init(&ifa->lock);
539 init_timer(&ifa->timer);
540 ifa->timer.data = (unsigned long) ifa;
541 ifa->scope = scope;
542 ifa->prefix_len = pfxlen;
543 ifa->flags = flags | IFA_F_TENTATIVE;
544 ifa->cstamp = ifa->tstamp = jiffies;
545
546 ifa->idev = idev;
547 in6_dev_hold(idev);
548 /* For caller */
549 in6_ifa_hold(ifa);
550
551 /* Add to big hash table */
552 hash = ipv6_addr_hash(addr);
553
554 ifa->lst_next = inet6_addr_lst[hash];
555 inet6_addr_lst[hash] = ifa;
556 in6_ifa_hold(ifa);
557 write_unlock(&addrconf_hash_lock);
558
559 write_lock(&idev->lock);
560 /* Add to inet6_dev unicast addr list. */
561 ifa->if_next = idev->addr_list;
562 idev->addr_list = ifa;
563
564 #ifdef CONFIG_IPV6_PRIVACY
565 if (ifa->flags&IFA_F_TEMPORARY) {
566 ifa->tmp_next = idev->tempaddr_list;
567 idev->tempaddr_list = ifa;
568 in6_ifa_hold(ifa);
569 }
570 #endif
571
572 ifa->rt = rt;
573
574 in6_ifa_hold(ifa);
575 write_unlock(&idev->lock);
576 out2:
577 read_unlock_bh(&addrconf_lock);
578
579 if (likely(err == 0))
580 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
581 else {
582 kfree(ifa);
583 ifa = ERR_PTR(err);
584 }
585
586 return ifa;
587 out:
588 write_unlock(&addrconf_hash_lock);
589 goto out2;
590 }
591
592 /* This function wants to get referenced ifp and releases it before return */
593
594 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
595 {
596 struct inet6_ifaddr *ifa, **ifap;
597 struct inet6_dev *idev = ifp->idev;
598 int hash;
599 int deleted = 0, onlink = 0;
600 unsigned long expires = jiffies;
601
602 hash = ipv6_addr_hash(&ifp->addr);
603
604 ifp->dead = 1;
605
606 write_lock_bh(&addrconf_hash_lock);
607 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
608 ifap = &ifa->lst_next) {
609 if (ifa == ifp) {
610 *ifap = ifa->lst_next;
611 __in6_ifa_put(ifp);
612 ifa->lst_next = NULL;
613 break;
614 }
615 }
616 write_unlock_bh(&addrconf_hash_lock);
617
618 write_lock_bh(&idev->lock);
619 #ifdef CONFIG_IPV6_PRIVACY
620 if (ifp->flags&IFA_F_TEMPORARY) {
621 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
622 ifap = &ifa->tmp_next) {
623 if (ifa == ifp) {
624 *ifap = ifa->tmp_next;
625 if (ifp->ifpub) {
626 in6_ifa_put(ifp->ifpub);
627 ifp->ifpub = NULL;
628 }
629 __in6_ifa_put(ifp);
630 ifa->tmp_next = NULL;
631 break;
632 }
633 }
634 }
635 #endif
636
637 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;
638 ifap = &ifa->if_next) {
639 if (ifa == ifp) {
640 *ifap = ifa->if_next;
641 __in6_ifa_put(ifp);
642 ifa->if_next = NULL;
643 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
644 break;
645 deleted = 1;
646 } else if (ifp->flags & IFA_F_PERMANENT) {
647 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
648 ifp->prefix_len)) {
649 if (ifa->flags & IFA_F_PERMANENT) {
650 onlink = 1;
651 if (deleted)
652 break;
653 } else {
654 unsigned long lifetime;
655
656 if (!onlink)
657 onlink = -1;
658
659 spin_lock(&ifa->lock);
660 lifetime = min_t(unsigned long,
661 ifa->valid_lft, 0x7fffffffUL/HZ);
662 if (time_before(expires,
663 ifa->tstamp + lifetime * HZ))
664 expires = ifa->tstamp + lifetime * HZ;
665 spin_unlock(&ifa->lock);
666 }
667 }
668 }
669 }
670 write_unlock_bh(&idev->lock);
671
672 ipv6_ifa_notify(RTM_DELADDR, ifp);
673
674 notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
675
676 addrconf_del_timer(ifp);
677
678 /*
679 * Purge or update corresponding prefix
680 *
681 * 1) we don't purge prefix here if address was not permanent.
682 * prefix is managed by its own lifetime.
683 * 2) if there're no addresses, delete prefix.
684 * 3) if there're still other permanent address(es),
685 * corresponding prefix is still permanent.
686 * 4) otherwise, update prefix lifetime to the
687 * longest valid lifetime among the corresponding
688 * addresses on the device.
689 * Note: subsequent RA will update lifetime.
690 *
691 * --yoshfuji
692 */
693 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
694 struct in6_addr prefix;
695 struct rt6_info *rt;
696
697 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
698 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
699
700 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
701 if (onlink == 0) {
702 ip6_del_rt(rt, NULL, NULL, NULL);
703 rt = NULL;
704 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
705 rt->rt6i_expires = expires;
706 rt->rt6i_flags |= RTF_EXPIRES;
707 }
708 }
709 dst_release(&rt->u.dst);
710 }
711
712 in6_ifa_put(ifp);
713 }
714
715 #ifdef CONFIG_IPV6_PRIVACY
716 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
717 {
718 struct inet6_dev *idev = ifp->idev;
719 struct in6_addr addr, *tmpaddr;
720 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
721 int tmp_plen;
722 int ret = 0;
723 int max_addresses;
724
725 write_lock(&idev->lock);
726 if (ift) {
727 spin_lock_bh(&ift->lock);
728 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
729 spin_unlock_bh(&ift->lock);
730 tmpaddr = &addr;
731 } else {
732 tmpaddr = NULL;
733 }
734 retry:
735 in6_dev_hold(idev);
736 if (idev->cnf.use_tempaddr <= 0) {
737 write_unlock(&idev->lock);
738 printk(KERN_INFO
739 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
740 in6_dev_put(idev);
741 ret = -1;
742 goto out;
743 }
744 spin_lock_bh(&ifp->lock);
745 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
746 idev->cnf.use_tempaddr = -1; /*XXX*/
747 spin_unlock_bh(&ifp->lock);
748 write_unlock(&idev->lock);
749 printk(KERN_WARNING
750 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
751 in6_dev_put(idev);
752 ret = -1;
753 goto out;
754 }
755 in6_ifa_hold(ifp);
756 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
757 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
758 spin_unlock_bh(&ifp->lock);
759 write_unlock(&idev->lock);
760 printk(KERN_WARNING
761 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
762 in6_ifa_put(ifp);
763 in6_dev_put(idev);
764 ret = -1;
765 goto out;
766 }
767 memcpy(&addr.s6_addr[8], idev->rndid, 8);
768 tmp_valid_lft = min_t(__u32,
769 ifp->valid_lft,
770 idev->cnf.temp_valid_lft);
771 tmp_prefered_lft = min_t(__u32,
772 ifp->prefered_lft,
773 idev->cnf.temp_prefered_lft - desync_factor / HZ);
774 tmp_plen = ifp->prefix_len;
775 max_addresses = idev->cnf.max_addresses;
776 tmp_cstamp = ifp->cstamp;
777 tmp_tstamp = ifp->tstamp;
778 spin_unlock_bh(&ifp->lock);
779
780 write_unlock(&idev->lock);
781 ift = !max_addresses ||
782 ipv6_count_addresses(idev) < max_addresses ?
783 ipv6_add_addr(idev, &addr, tmp_plen,
784 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
785 if (!ift || IS_ERR(ift)) {
786 in6_ifa_put(ifp);
787 in6_dev_put(idev);
788 printk(KERN_INFO
789 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
790 tmpaddr = &addr;
791 write_lock(&idev->lock);
792 goto retry;
793 }
794
795 spin_lock_bh(&ift->lock);
796 ift->ifpub = ifp;
797 ift->valid_lft = tmp_valid_lft;
798 ift->prefered_lft = tmp_prefered_lft;
799 ift->cstamp = tmp_cstamp;
800 ift->tstamp = tmp_tstamp;
801 spin_unlock_bh(&ift->lock);
802
803 addrconf_dad_start(ift, 0);
804 in6_ifa_put(ift);
805 in6_dev_put(idev);
806 out:
807 return ret;
808 }
809 #endif
810
811 /*
812 * Choose an appropriate source address (RFC3484)
813 */
814 struct ipv6_saddr_score {
815 int addr_type;
816 unsigned int attrs;
817 int matchlen;
818 unsigned int scope;
819 unsigned int rule;
820 };
821
822 #define IPV6_SADDR_SCORE_LOCAL 0x0001
823 #define IPV6_SADDR_SCORE_PREFERRED 0x0004
824 #define IPV6_SADDR_SCORE_HOA 0x0008
825 #define IPV6_SADDR_SCORE_OIF 0x0010
826 #define IPV6_SADDR_SCORE_LABEL 0x0020
827 #define IPV6_SADDR_SCORE_PRIVACY 0x0040
828
829 static int inline ipv6_saddr_preferred(int type)
830 {
831 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
832 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
833 return 1;
834 return 0;
835 }
836
837 /* static matching label */
838 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
839 {
840 /*
841 * prefix (longest match) label
842 * -----------------------------
843 * ::1/128 0
844 * ::/0 1
845 * 2002::/16 2
846 * ::/96 3
847 * ::ffff:0:0/96 4
848 */
849 if (type & IPV6_ADDR_LOOPBACK)
850 return 0;
851 else if (type & IPV6_ADDR_COMPATv4)
852 return 3;
853 else if (type & IPV6_ADDR_MAPPED)
854 return 4;
855 else if (addr->s6_addr16[0] == htons(0x2002))
856 return 2;
857 return 1;
858 }
859
860 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
861 struct in6_addr *daddr, struct in6_addr *saddr)
862 {
863 struct ipv6_saddr_score hiscore;
864 struct inet6_ifaddr *ifa_result = NULL;
865 int daddr_type = __ipv6_addr_type(daddr);
866 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
867 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
868 struct net_device *dev;
869
870 memset(&hiscore, 0, sizeof(hiscore));
871
872 read_lock(&dev_base_lock);
873 read_lock(&addrconf_lock);
874
875 for (dev = dev_base; dev; dev=dev->next) {
876 struct inet6_dev *idev;
877 struct inet6_ifaddr *ifa;
878
879 /* Rule 0: Candidate Source Address (section 4)
880 * - multicast and link-local destination address,
881 * the set of candidate source address MUST only
882 * include addresses assigned to interfaces
883 * belonging to the same link as the outgoing
884 * interface.
885 * (- For site-local destination addresses, the
886 * set of candidate source addresses MUST only
887 * include addresses assigned to interfaces
888 * belonging to the same site as the outgoing
889 * interface.)
890 */
891 if ((daddr_type & IPV6_ADDR_MULTICAST ||
892 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
893 daddr_dev && dev != daddr_dev)
894 continue;
895
896 idev = __in6_dev_get(dev);
897 if (!idev)
898 continue;
899
900 read_lock_bh(&idev->lock);
901 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
902 struct ipv6_saddr_score score;
903
904 score.addr_type = __ipv6_addr_type(&ifa->addr);
905
906 /* Rule 0: Candidate Source Address (section 4)
907 * - In any case, anycast addresses, multicast
908 * addresses, and the unspecified address MUST
909 * NOT be included in a candidate set.
910 */
911 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
912 score.addr_type & IPV6_ADDR_MULTICAST)) {
913 LIMIT_NETDEBUG(KERN_DEBUG
914 "ADDRCONF: unspecified / multicast address"
915 "assigned as unicast address on %s",
916 dev->name);
917 continue;
918 }
919
920 score.attrs = 0;
921 score.matchlen = 0;
922 score.scope = 0;
923 score.rule = 0;
924
925 if (ifa_result == NULL) {
926 /* record it if the first available entry */
927 goto record_it;
928 }
929
930 /* Rule 1: Prefer same address */
931 if (hiscore.rule < 1) {
932 if (ipv6_addr_equal(&ifa_result->addr, daddr))
933 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
934 hiscore.rule++;
935 }
936 if (ipv6_addr_equal(&ifa->addr, daddr)) {
937 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
938 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
939 score.rule = 1;
940 goto record_it;
941 }
942 } else {
943 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
944 continue;
945 }
946
947 /* Rule 2: Prefer appropriate scope */
948 if (hiscore.rule < 2) {
949 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
950 hiscore.rule++;
951 }
952 score.scope = __ipv6_addr_src_scope(score.addr_type);
953 if (hiscore.scope < score.scope) {
954 if (hiscore.scope < daddr_scope) {
955 score.rule = 2;
956 goto record_it;
957 } else
958 continue;
959 } else if (score.scope < hiscore.scope) {
960 if (score.scope < daddr_scope)
961 continue;
962 else {
963 score.rule = 2;
964 goto record_it;
965 }
966 }
967
968 /* Rule 3: Avoid deprecated address */
969 if (hiscore.rule < 3) {
970 if (ipv6_saddr_preferred(hiscore.addr_type) ||
971 !(ifa_result->flags & IFA_F_DEPRECATED))
972 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
973 hiscore.rule++;
974 }
975 if (ipv6_saddr_preferred(score.addr_type) ||
976 !(ifa->flags & IFA_F_DEPRECATED)) {
977 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
978 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
979 score.rule = 3;
980 goto record_it;
981 }
982 } else {
983 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
984 continue;
985 }
986
987 /* Rule 4: Prefer home address -- not implemented yet */
988
989 /* Rule 5: Prefer outgoing interface */
990 if (hiscore.rule < 5) {
991 if (daddr_dev == NULL ||
992 daddr_dev == ifa_result->idev->dev)
993 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
994 hiscore.rule++;
995 }
996 if (daddr_dev == NULL ||
997 daddr_dev == ifa->idev->dev) {
998 score.attrs |= IPV6_SADDR_SCORE_OIF;
999 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1000 score.rule = 5;
1001 goto record_it;
1002 }
1003 } else {
1004 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1005 continue;
1006 }
1007
1008 /* Rule 6: Prefer matching label */
1009 if (hiscore.rule < 6) {
1010 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1011 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1012 hiscore.rule++;
1013 }
1014 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1015 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1016 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1017 score.rule = 6;
1018 goto record_it;
1019 }
1020 } else {
1021 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1022 continue;
1023 }
1024
1025 #ifdef CONFIG_IPV6_PRIVACY
1026 /* Rule 7: Prefer public address
1027 * Note: prefer temprary address if use_tempaddr >= 2
1028 */
1029 if (hiscore.rule < 7) {
1030 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1031 (ifa_result->idev->cnf.use_tempaddr >= 2))
1032 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1033 hiscore.rule++;
1034 }
1035 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1036 (ifa->idev->cnf.use_tempaddr >= 2)) {
1037 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1038 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1039 score.rule = 7;
1040 goto record_it;
1041 }
1042 } else {
1043 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1044 continue;
1045 }
1046 #endif
1047 /* Rule 8: Use longest matching prefix */
1048 if (hiscore.rule < 8)
1049 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1050 score.rule++;
1051 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1052 if (score.matchlen > hiscore.matchlen) {
1053 score.rule = 8;
1054 goto record_it;
1055 }
1056 #if 0
1057 else if (score.matchlen < hiscore.matchlen)
1058 continue;
1059 #endif
1060
1061 /* Final Rule: choose first available one */
1062 continue;
1063 record_it:
1064 if (ifa_result)
1065 in6_ifa_put(ifa_result);
1066 in6_ifa_hold(ifa);
1067 ifa_result = ifa;
1068 hiscore = score;
1069 }
1070 read_unlock_bh(&idev->lock);
1071 }
1072 read_unlock(&addrconf_lock);
1073 read_unlock(&dev_base_lock);
1074
1075 if (!ifa_result)
1076 return -EADDRNOTAVAIL;
1077
1078 ipv6_addr_copy(saddr, &ifa_result->addr);
1079 in6_ifa_put(ifa_result);
1080 return 0;
1081 }
1082
1083
1084 int ipv6_get_saddr(struct dst_entry *dst,
1085 struct in6_addr *daddr, struct in6_addr *saddr)
1086 {
1087 return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1088 }
1089
1090
1091 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1092 {
1093 struct inet6_dev *idev;
1094 int err = -EADDRNOTAVAIL;
1095
1096 read_lock(&addrconf_lock);
1097 if ((idev = __in6_dev_get(dev)) != NULL) {
1098 struct inet6_ifaddr *ifp;
1099
1100 read_lock_bh(&idev->lock);
1101 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1102 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1103 ipv6_addr_copy(addr, &ifp->addr);
1104 err = 0;
1105 break;
1106 }
1107 }
1108 read_unlock_bh(&idev->lock);
1109 }
1110 read_unlock(&addrconf_lock);
1111 return err;
1112 }
1113
1114 static int ipv6_count_addresses(struct inet6_dev *idev)
1115 {
1116 int cnt = 0;
1117 struct inet6_ifaddr *ifp;
1118
1119 read_lock_bh(&idev->lock);
1120 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1121 cnt++;
1122 read_unlock_bh(&idev->lock);
1123 return cnt;
1124 }
1125
1126 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1127 {
1128 struct inet6_ifaddr * ifp;
1129 u8 hash = ipv6_addr_hash(addr);
1130
1131 read_lock_bh(&addrconf_hash_lock);
1132 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1133 if (ipv6_addr_equal(&ifp->addr, addr) &&
1134 !(ifp->flags&IFA_F_TENTATIVE)) {
1135 if (dev == NULL || ifp->idev->dev == dev ||
1136 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1137 break;
1138 }
1139 }
1140 read_unlock_bh(&addrconf_hash_lock);
1141 return ifp != NULL;
1142 }
1143
1144 static
1145 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1146 {
1147 struct inet6_ifaddr * ifp;
1148 u8 hash = ipv6_addr_hash(addr);
1149
1150 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1151 if (ipv6_addr_equal(&ifp->addr, addr)) {
1152 if (dev == NULL || ifp->idev->dev == dev)
1153 break;
1154 }
1155 }
1156 return ifp != NULL;
1157 }
1158
1159 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1160 {
1161 struct inet6_ifaddr * ifp;
1162 u8 hash = ipv6_addr_hash(addr);
1163
1164 read_lock_bh(&addrconf_hash_lock);
1165 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1166 if (ipv6_addr_equal(&ifp->addr, addr)) {
1167 if (dev == NULL || ifp->idev->dev == dev ||
1168 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1169 in6_ifa_hold(ifp);
1170 break;
1171 }
1172 }
1173 }
1174 read_unlock_bh(&addrconf_hash_lock);
1175
1176 return ifp;
1177 }
1178
1179 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1180 {
1181 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1182 const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2);
1183 u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1184 u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1185 int sk_ipv6only = ipv6_only_sock(sk);
1186 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1187 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1188 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1189
1190 if (!sk2_rcv_saddr && !sk_ipv6only)
1191 return 1;
1192
1193 if (addr_type2 == IPV6_ADDR_ANY &&
1194 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1195 return 1;
1196
1197 if (addr_type == IPV6_ADDR_ANY &&
1198 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1199 return 1;
1200
1201 if (sk2_rcv_saddr6 &&
1202 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1203 return 1;
1204
1205 if (addr_type == IPV6_ADDR_MAPPED &&
1206 !sk2_ipv6only &&
1207 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1208 return 1;
1209
1210 return 0;
1211 }
1212
1213 /* Gets referenced address, destroys ifaddr */
1214
1215 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1216 {
1217 if (net_ratelimit())
1218 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1219 if (ifp->flags&IFA_F_PERMANENT) {
1220 spin_lock_bh(&ifp->lock);
1221 addrconf_del_timer(ifp);
1222 ifp->flags |= IFA_F_TENTATIVE;
1223 spin_unlock_bh(&ifp->lock);
1224 in6_ifa_put(ifp);
1225 #ifdef CONFIG_IPV6_PRIVACY
1226 } else if (ifp->flags&IFA_F_TEMPORARY) {
1227 struct inet6_ifaddr *ifpub;
1228 spin_lock_bh(&ifp->lock);
1229 ifpub = ifp->ifpub;
1230 if (ifpub) {
1231 in6_ifa_hold(ifpub);
1232 spin_unlock_bh(&ifp->lock);
1233 ipv6_create_tempaddr(ifpub, ifp);
1234 in6_ifa_put(ifpub);
1235 } else {
1236 spin_unlock_bh(&ifp->lock);
1237 }
1238 ipv6_del_addr(ifp);
1239 #endif
1240 } else
1241 ipv6_del_addr(ifp);
1242 }
1243
1244
1245 /* Join to solicited addr multicast group. */
1246
1247 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1248 {
1249 struct in6_addr maddr;
1250
1251 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1252 return;
1253
1254 addrconf_addr_solict_mult(addr, &maddr);
1255 ipv6_dev_mc_inc(dev, &maddr);
1256 }
1257
1258 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1259 {
1260 struct in6_addr maddr;
1261
1262 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1263 return;
1264
1265 addrconf_addr_solict_mult(addr, &maddr);
1266 __ipv6_dev_mc_dec(idev, &maddr);
1267 }
1268
1269 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1270 {
1271 struct in6_addr addr;
1272 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1273 if (ipv6_addr_any(&addr))
1274 return;
1275 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1276 }
1277
1278 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1279 {
1280 struct in6_addr addr;
1281 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1282 if (ipv6_addr_any(&addr))
1283 return;
1284 __ipv6_dev_ac_dec(ifp->idev, &addr);
1285 }
1286
1287 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1288 {
1289 switch (dev->type) {
1290 case ARPHRD_ETHER:
1291 case ARPHRD_FDDI:
1292 case ARPHRD_IEEE802_TR:
1293 if (dev->addr_len != ETH_ALEN)
1294 return -1;
1295 memcpy(eui, dev->dev_addr, 3);
1296 memcpy(eui + 5, dev->dev_addr + 3, 3);
1297
1298 /*
1299 * The zSeries OSA network cards can be shared among various
1300 * OS instances, but the OSA cards have only one MAC address.
1301 * This leads to duplicate address conflicts in conjunction
1302 * with IPv6 if more than one instance uses the same card.
1303 *
1304 * The driver for these cards can deliver a unique 16-bit
1305 * identifier for each instance sharing the same card. It is
1306 * placed instead of 0xFFFE in the interface identifier. The
1307 * "u" bit of the interface identifier is not inverted in this
1308 * case. Hence the resulting interface identifier has local
1309 * scope according to RFC2373.
1310 */
1311 if (dev->dev_id) {
1312 eui[3] = (dev->dev_id >> 8) & 0xFF;
1313 eui[4] = dev->dev_id & 0xFF;
1314 } else {
1315 eui[3] = 0xFF;
1316 eui[4] = 0xFE;
1317 eui[0] ^= 2;
1318 }
1319 return 0;
1320 case ARPHRD_ARCNET:
1321 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1322 if (dev->addr_len != ARCNET_ALEN)
1323 return -1;
1324 memset(eui, 0, 7);
1325 eui[7] = *(u8*)dev->dev_addr;
1326 return 0;
1327 case ARPHRD_INFINIBAND:
1328 if (dev->addr_len != INFINIBAND_ALEN)
1329 return -1;
1330 memcpy(eui, dev->dev_addr + 12, 8);
1331 eui[0] |= 2;
1332 return 0;
1333 }
1334 return -1;
1335 }
1336
1337 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1338 {
1339 int err = -1;
1340 struct inet6_ifaddr *ifp;
1341
1342 read_lock_bh(&idev->lock);
1343 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1344 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1345 memcpy(eui, ifp->addr.s6_addr+8, 8);
1346 err = 0;
1347 break;
1348 }
1349 }
1350 read_unlock_bh(&idev->lock);
1351 return err;
1352 }
1353
1354 #ifdef CONFIG_IPV6_PRIVACY
1355 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1356 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1357 {
1358 struct net_device *dev;
1359 struct scatterlist sg[2];
1360
1361 sg_set_buf(&sg[0], idev->entropy, 8);
1362 sg_set_buf(&sg[1], idev->work_eui64, 8);
1363
1364 dev = idev->dev;
1365
1366 if (ipv6_generate_eui64(idev->work_eui64, dev)) {
1367 printk(KERN_INFO
1368 "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
1369 idev);
1370 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
1371 }
1372 regen:
1373 spin_lock(&md5_tfm_lock);
1374 if (unlikely(md5_tfm == NULL)) {
1375 spin_unlock(&md5_tfm_lock);
1376 return -1;
1377 }
1378 crypto_digest_init(md5_tfm);
1379 crypto_digest_update(md5_tfm, sg, 2);
1380 crypto_digest_final(md5_tfm, idev->work_digest);
1381 spin_unlock(&md5_tfm_lock);
1382
1383 memcpy(idev->rndid, &idev->work_digest[0], 8);
1384 idev->rndid[0] &= ~0x02;
1385 memcpy(idev->entropy, &idev->work_digest[8], 8);
1386
1387 /*
1388 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1389 * check if generated address is not inappropriate
1390 *
1391 * - Reserved subnet anycast (RFC 2526)
1392 * 11111101 11....11 1xxxxxxx
1393 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1394 * 00-00-5E-FE-xx-xx-xx-xx
1395 * - value 0
1396 * - XXX: already assigned to an address on the device
1397 */
1398 if (idev->rndid[0] == 0xfd &&
1399 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1400 (idev->rndid[7]&0x80))
1401 goto regen;
1402 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1403 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1404 goto regen;
1405 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1406 goto regen;
1407 }
1408
1409 return 0;
1410 }
1411
1412 static void ipv6_regen_rndid(unsigned long data)
1413 {
1414 struct inet6_dev *idev = (struct inet6_dev *) data;
1415 unsigned long expires;
1416
1417 read_lock_bh(&addrconf_lock);
1418 write_lock_bh(&idev->lock);
1419
1420 if (idev->dead)
1421 goto out;
1422
1423 if (__ipv6_regen_rndid(idev) < 0)
1424 goto out;
1425
1426 expires = jiffies +
1427 idev->cnf.temp_prefered_lft * HZ -
1428 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1429 if (time_before(expires, jiffies)) {
1430 printk(KERN_WARNING
1431 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1432 idev->dev->name);
1433 goto out;
1434 }
1435
1436 if (!mod_timer(&idev->regen_timer, expires))
1437 in6_dev_hold(idev);
1438
1439 out:
1440 write_unlock_bh(&idev->lock);
1441 read_unlock_bh(&addrconf_lock);
1442 in6_dev_put(idev);
1443 }
1444
1445 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1446 int ret = 0;
1447
1448 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1449 ret = __ipv6_regen_rndid(idev);
1450 return ret;
1451 }
1452 #endif
1453
1454 /*
1455 * Add prefix route.
1456 */
1457
1458 static void
1459 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1460 unsigned long expires, u32 flags)
1461 {
1462 struct in6_rtmsg rtmsg;
1463
1464 memset(&rtmsg, 0, sizeof(rtmsg));
1465 ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1466 rtmsg.rtmsg_dst_len = plen;
1467 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1468 rtmsg.rtmsg_ifindex = dev->ifindex;
1469 rtmsg.rtmsg_info = expires;
1470 rtmsg.rtmsg_flags = RTF_UP|flags;
1471 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1472
1473 /* Prevent useless cloning on PtP SIT.
1474 This thing is done here expecting that the whole
1475 class of non-broadcast devices need not cloning.
1476 */
1477 if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1478 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1479
1480 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1481 }
1482
1483 /* Create "default" multicast route to the interface */
1484
1485 static void addrconf_add_mroute(struct net_device *dev)
1486 {
1487 struct in6_rtmsg rtmsg;
1488
1489 memset(&rtmsg, 0, sizeof(rtmsg));
1490 ipv6_addr_set(&rtmsg.rtmsg_dst,
1491 htonl(0xFF000000), 0, 0, 0);
1492 rtmsg.rtmsg_dst_len = 8;
1493 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1494 rtmsg.rtmsg_ifindex = dev->ifindex;
1495 rtmsg.rtmsg_flags = RTF_UP;
1496 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1497 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1498 }
1499
1500 static void sit_route_add(struct net_device *dev)
1501 {
1502 struct in6_rtmsg rtmsg;
1503
1504 memset(&rtmsg, 0, sizeof(rtmsg));
1505
1506 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1507 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1508
1509 /* prefix length - 96 bits "::d.d.d.d" */
1510 rtmsg.rtmsg_dst_len = 96;
1511 rtmsg.rtmsg_flags = RTF_UP|RTF_NONEXTHOP;
1512 rtmsg.rtmsg_ifindex = dev->ifindex;
1513
1514 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1515 }
1516
1517 static void addrconf_add_lroute(struct net_device *dev)
1518 {
1519 struct in6_addr addr;
1520
1521 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1522 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1523 }
1524
1525 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1526 {
1527 struct inet6_dev *idev;
1528
1529 ASSERT_RTNL();
1530
1531 if ((idev = ipv6_find_idev(dev)) == NULL)
1532 return NULL;
1533
1534 /* Add default multicast route */
1535 addrconf_add_mroute(dev);
1536
1537 /* Add link local route */
1538 addrconf_add_lroute(dev);
1539 return idev;
1540 }
1541
1542 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1543 {
1544 struct prefix_info *pinfo;
1545 __u32 valid_lft;
1546 __u32 prefered_lft;
1547 int addr_type;
1548 unsigned long rt_expires;
1549 struct inet6_dev *in6_dev;
1550
1551 pinfo = (struct prefix_info *) opt;
1552
1553 if (len < sizeof(struct prefix_info)) {
1554 ADBG(("addrconf: prefix option too short\n"));
1555 return;
1556 }
1557
1558 /*
1559 * Validation checks ([ADDRCONF], page 19)
1560 */
1561
1562 addr_type = ipv6_addr_type(&pinfo->prefix);
1563
1564 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1565 return;
1566
1567 valid_lft = ntohl(pinfo->valid);
1568 prefered_lft = ntohl(pinfo->prefered);
1569
1570 if (prefered_lft > valid_lft) {
1571 if (net_ratelimit())
1572 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1573 return;
1574 }
1575
1576 in6_dev = in6_dev_get(dev);
1577
1578 if (in6_dev == NULL) {
1579 if (net_ratelimit())
1580 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1581 return;
1582 }
1583
1584 /*
1585 * Two things going on here:
1586 * 1) Add routes for on-link prefixes
1587 * 2) Configure prefixes with the auto flag set
1588 */
1589
1590 /* Avoid arithmetic overflow. Really, we could
1591 save rt_expires in seconds, likely valid_lft,
1592 but it would require division in fib gc, that it
1593 not good.
1594 */
1595 if (valid_lft >= 0x7FFFFFFF/HZ)
1596 rt_expires = 0;
1597 else
1598 rt_expires = jiffies + valid_lft * HZ;
1599
1600 if (pinfo->onlink) {
1601 struct rt6_info *rt;
1602 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1603
1604 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1605 if (rt->rt6i_flags&RTF_EXPIRES) {
1606 if (valid_lft == 0) {
1607 ip6_del_rt(rt, NULL, NULL, NULL);
1608 rt = NULL;
1609 } else {
1610 rt->rt6i_expires = rt_expires;
1611 }
1612 }
1613 } else if (valid_lft) {
1614 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1615 dev, rt_expires, RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1616 }
1617 if (rt)
1618 dst_release(&rt->u.dst);
1619 }
1620
1621 /* Try to figure out our local address for this prefix */
1622
1623 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1624 struct inet6_ifaddr * ifp;
1625 struct in6_addr addr;
1626 int create = 0, update_lft = 0;
1627
1628 if (pinfo->prefix_len == 64) {
1629 memcpy(&addr, &pinfo->prefix, 8);
1630 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1631 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1632 in6_dev_put(in6_dev);
1633 return;
1634 }
1635 goto ok;
1636 }
1637 if (net_ratelimit())
1638 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1639 pinfo->prefix_len);
1640 in6_dev_put(in6_dev);
1641 return;
1642
1643 ok:
1644
1645 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1646
1647 if (ifp == NULL && valid_lft) {
1648 int max_addresses = in6_dev->cnf.max_addresses;
1649
1650 /* Do not allow to create too much of autoconfigured
1651 * addresses; this would be too easy way to crash kernel.
1652 */
1653 if (!max_addresses ||
1654 ipv6_count_addresses(in6_dev) < max_addresses)
1655 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1656 addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1657
1658 if (!ifp || IS_ERR(ifp)) {
1659 in6_dev_put(in6_dev);
1660 return;
1661 }
1662
1663 update_lft = create = 1;
1664 ifp->cstamp = jiffies;
1665 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1666 }
1667
1668 if (ifp) {
1669 int flags;
1670 unsigned long now;
1671 #ifdef CONFIG_IPV6_PRIVACY
1672 struct inet6_ifaddr *ift;
1673 #endif
1674 u32 stored_lft;
1675
1676 /* update lifetime (RFC2462 5.5.3 e) */
1677 spin_lock(&ifp->lock);
1678 now = jiffies;
1679 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1680 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1681 else
1682 stored_lft = 0;
1683 if (!update_lft && stored_lft) {
1684 if (valid_lft > MIN_VALID_LIFETIME ||
1685 valid_lft > stored_lft)
1686 update_lft = 1;
1687 else if (stored_lft <= MIN_VALID_LIFETIME) {
1688 /* valid_lft <= stored_lft is always true */
1689 /* XXX: IPsec */
1690 update_lft = 0;
1691 } else {
1692 valid_lft = MIN_VALID_LIFETIME;
1693 if (valid_lft < prefered_lft)
1694 prefered_lft = valid_lft;
1695 update_lft = 1;
1696 }
1697 }
1698
1699 if (update_lft) {
1700 ifp->valid_lft = valid_lft;
1701 ifp->prefered_lft = prefered_lft;
1702 ifp->tstamp = now;
1703 flags = ifp->flags;
1704 ifp->flags &= ~IFA_F_DEPRECATED;
1705 spin_unlock(&ifp->lock);
1706
1707 if (!(flags&IFA_F_TENTATIVE))
1708 ipv6_ifa_notify(0, ifp);
1709 } else
1710 spin_unlock(&ifp->lock);
1711
1712 #ifdef CONFIG_IPV6_PRIVACY
1713 read_lock_bh(&in6_dev->lock);
1714 /* update all temporary addresses in the list */
1715 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1716 /*
1717 * When adjusting the lifetimes of an existing
1718 * temporary address, only lower the lifetimes.
1719 * Implementations must not increase the
1720 * lifetimes of an existing temporary address
1721 * when processing a Prefix Information Option.
1722 */
1723 spin_lock(&ift->lock);
1724 flags = ift->flags;
1725 if (ift->valid_lft > valid_lft &&
1726 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1727 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1728 if (ift->prefered_lft > prefered_lft &&
1729 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1730 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1731 spin_unlock(&ift->lock);
1732 if (!(flags&IFA_F_TENTATIVE))
1733 ipv6_ifa_notify(0, ift);
1734 }
1735
1736 if (create && in6_dev->cnf.use_tempaddr > 0) {
1737 /*
1738 * When a new public address is created as described in [ADDRCONF],
1739 * also create a new temporary address.
1740 */
1741 read_unlock_bh(&in6_dev->lock);
1742 ipv6_create_tempaddr(ifp, NULL);
1743 } else {
1744 read_unlock_bh(&in6_dev->lock);
1745 }
1746 #endif
1747 in6_ifa_put(ifp);
1748 addrconf_verify(0);
1749 }
1750 }
1751 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1752 in6_dev_put(in6_dev);
1753 }
1754
1755 /*
1756 * Set destination address.
1757 * Special case for SIT interfaces where we create a new "virtual"
1758 * device.
1759 */
1760 int addrconf_set_dstaddr(void __user *arg)
1761 {
1762 struct in6_ifreq ireq;
1763 struct net_device *dev;
1764 int err = -EINVAL;
1765
1766 rtnl_lock();
1767
1768 err = -EFAULT;
1769 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1770 goto err_exit;
1771
1772 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1773
1774 err = -ENODEV;
1775 if (dev == NULL)
1776 goto err_exit;
1777
1778 if (dev->type == ARPHRD_SIT) {
1779 struct ifreq ifr;
1780 mm_segment_t oldfs;
1781 struct ip_tunnel_parm p;
1782
1783 err = -EADDRNOTAVAIL;
1784 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1785 goto err_exit;
1786
1787 memset(&p, 0, sizeof(p));
1788 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1789 p.iph.saddr = 0;
1790 p.iph.version = 4;
1791 p.iph.ihl = 5;
1792 p.iph.protocol = IPPROTO_IPV6;
1793 p.iph.ttl = 64;
1794 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1795
1796 oldfs = get_fs(); set_fs(KERNEL_DS);
1797 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1798 set_fs(oldfs);
1799
1800 if (err == 0) {
1801 err = -ENOBUFS;
1802 if ((dev = __dev_get_by_name(p.name)) == NULL)
1803 goto err_exit;
1804 err = dev_open(dev);
1805 }
1806 }
1807
1808 err_exit:
1809 rtnl_unlock();
1810 return err;
1811 }
1812
1813 /*
1814 * Manual configuration of address on an interface
1815 */
1816 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1817 {
1818 struct inet6_ifaddr *ifp;
1819 struct inet6_dev *idev;
1820 struct net_device *dev;
1821 int scope;
1822
1823 ASSERT_RTNL();
1824
1825 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1826 return -ENODEV;
1827
1828 if (!(dev->flags&IFF_UP))
1829 return -ENETDOWN;
1830
1831 if ((idev = addrconf_add_dev(dev)) == NULL)
1832 return -ENOBUFS;
1833
1834 scope = ipv6_addr_scope(pfx);
1835
1836 ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1837 if (!IS_ERR(ifp)) {
1838 addrconf_dad_start(ifp, 0);
1839 in6_ifa_put(ifp);
1840 return 0;
1841 }
1842
1843 return PTR_ERR(ifp);
1844 }
1845
1846 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1847 {
1848 struct inet6_ifaddr *ifp;
1849 struct inet6_dev *idev;
1850 struct net_device *dev;
1851
1852 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1853 return -ENODEV;
1854
1855 if ((idev = __in6_dev_get(dev)) == NULL)
1856 return -ENXIO;
1857
1858 read_lock_bh(&idev->lock);
1859 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1860 if (ifp->prefix_len == plen &&
1861 ipv6_addr_equal(pfx, &ifp->addr)) {
1862 in6_ifa_hold(ifp);
1863 read_unlock_bh(&idev->lock);
1864
1865 ipv6_del_addr(ifp);
1866
1867 /* If the last address is deleted administratively,
1868 disable IPv6 on this interface.
1869 */
1870 if (idev->addr_list == NULL)
1871 addrconf_ifdown(idev->dev, 1);
1872 return 0;
1873 }
1874 }
1875 read_unlock_bh(&idev->lock);
1876 return -EADDRNOTAVAIL;
1877 }
1878
1879
1880 int addrconf_add_ifaddr(void __user *arg)
1881 {
1882 struct in6_ifreq ireq;
1883 int err;
1884
1885 if (!capable(CAP_NET_ADMIN))
1886 return -EPERM;
1887
1888 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1889 return -EFAULT;
1890
1891 rtnl_lock();
1892 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1893 rtnl_unlock();
1894 return err;
1895 }
1896
1897 int addrconf_del_ifaddr(void __user *arg)
1898 {
1899 struct in6_ifreq ireq;
1900 int err;
1901
1902 if (!capable(CAP_NET_ADMIN))
1903 return -EPERM;
1904
1905 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1906 return -EFAULT;
1907
1908 rtnl_lock();
1909 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1910 rtnl_unlock();
1911 return err;
1912 }
1913
1914 static void sit_add_v4_addrs(struct inet6_dev *idev)
1915 {
1916 struct inet6_ifaddr * ifp;
1917 struct in6_addr addr;
1918 struct net_device *dev;
1919 int scope;
1920
1921 ASSERT_RTNL();
1922
1923 memset(&addr, 0, sizeof(struct in6_addr));
1924 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1925
1926 if (idev->dev->flags&IFF_POINTOPOINT) {
1927 addr.s6_addr32[0] = htonl(0xfe800000);
1928 scope = IFA_LINK;
1929 } else {
1930 scope = IPV6_ADDR_COMPATv4;
1931 }
1932
1933 if (addr.s6_addr32[3]) {
1934 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1935 if (!IS_ERR(ifp)) {
1936 spin_lock_bh(&ifp->lock);
1937 ifp->flags &= ~IFA_F_TENTATIVE;
1938 spin_unlock_bh(&ifp->lock);
1939 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1940 in6_ifa_put(ifp);
1941 }
1942 return;
1943 }
1944
1945 for (dev = dev_base; dev != NULL; dev = dev->next) {
1946 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1947 if (in_dev && (dev->flags & IFF_UP)) {
1948 struct in_ifaddr * ifa;
1949
1950 int flag = scope;
1951
1952 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1953 int plen;
1954
1955 addr.s6_addr32[3] = ifa->ifa_local;
1956
1957 if (ifa->ifa_scope == RT_SCOPE_LINK)
1958 continue;
1959 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1960 if (idev->dev->flags&IFF_POINTOPOINT)
1961 continue;
1962 flag |= IFA_HOST;
1963 }
1964 if (idev->dev->flags&IFF_POINTOPOINT)
1965 plen = 64;
1966 else
1967 plen = 96;
1968
1969 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1970 IFA_F_PERMANENT);
1971 if (!IS_ERR(ifp)) {
1972 spin_lock_bh(&ifp->lock);
1973 ifp->flags &= ~IFA_F_TENTATIVE;
1974 spin_unlock_bh(&ifp->lock);
1975 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1976 in6_ifa_put(ifp);
1977 }
1978 }
1979 }
1980 }
1981 }
1982
1983 static void init_loopback(struct net_device *dev)
1984 {
1985 struct inet6_dev *idev;
1986 struct inet6_ifaddr * ifp;
1987
1988 /* ::1 */
1989
1990 ASSERT_RTNL();
1991
1992 if ((idev = ipv6_find_idev(dev)) == NULL) {
1993 printk(KERN_DEBUG "init loopback: add_dev failed\n");
1994 return;
1995 }
1996
1997 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
1998 if (!IS_ERR(ifp)) {
1999 spin_lock_bh(&ifp->lock);
2000 ifp->flags &= ~IFA_F_TENTATIVE;
2001 spin_unlock_bh(&ifp->lock);
2002 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2003 in6_ifa_put(ifp);
2004 }
2005 }
2006
2007 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2008 {
2009 struct inet6_ifaddr * ifp;
2010
2011 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2012 if (!IS_ERR(ifp)) {
2013 addrconf_dad_start(ifp, 0);
2014 in6_ifa_put(ifp);
2015 }
2016 }
2017
2018 static void addrconf_dev_config(struct net_device *dev)
2019 {
2020 struct in6_addr addr;
2021 struct inet6_dev * idev;
2022
2023 ASSERT_RTNL();
2024
2025 if ((dev->type != ARPHRD_ETHER) &&
2026 (dev->type != ARPHRD_FDDI) &&
2027 (dev->type != ARPHRD_IEEE802_TR) &&
2028 (dev->type != ARPHRD_ARCNET) &&
2029 (dev->type != ARPHRD_INFINIBAND)) {
2030 /* Alas, we support only Ethernet autoconfiguration. */
2031 return;
2032 }
2033
2034 idev = addrconf_add_dev(dev);
2035 if (idev == NULL)
2036 return;
2037
2038 memset(&addr, 0, sizeof(struct in6_addr));
2039 addr.s6_addr32[0] = htonl(0xFE800000);
2040
2041 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2042 addrconf_add_linklocal(idev, &addr);
2043 }
2044
2045 static void addrconf_sit_config(struct net_device *dev)
2046 {
2047 struct inet6_dev *idev;
2048
2049 ASSERT_RTNL();
2050
2051 /*
2052 * Configure the tunnel with one of our IPv4
2053 * addresses... we should configure all of
2054 * our v4 addrs in the tunnel
2055 */
2056
2057 if ((idev = ipv6_find_idev(dev)) == NULL) {
2058 printk(KERN_DEBUG "init sit: add_dev failed\n");
2059 return;
2060 }
2061
2062 sit_add_v4_addrs(idev);
2063
2064 if (dev->flags&IFF_POINTOPOINT) {
2065 addrconf_add_mroute(dev);
2066 addrconf_add_lroute(dev);
2067 } else
2068 sit_route_add(dev);
2069 }
2070
2071 static inline int
2072 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2073 {
2074 struct in6_addr lladdr;
2075
2076 if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2077 addrconf_add_linklocal(idev, &lladdr);
2078 return 0;
2079 }
2080 return -1;
2081 }
2082
2083 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2084 {
2085 struct net_device *link_dev;
2086
2087 /* first try to inherit the link-local address from the link device */
2088 if (idev->dev->iflink &&
2089 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2090 if (!ipv6_inherit_linklocal(idev, link_dev))
2091 return;
2092 }
2093 /* then try to inherit it from any device */
2094 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2095 if (!ipv6_inherit_linklocal(idev, link_dev))
2096 return;
2097 }
2098 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2099 }
2100
2101 /*
2102 * Autoconfigure tunnel with a link-local address so routing protocols,
2103 * DHCPv6, MLD etc. can be run over the virtual link
2104 */
2105
2106 static void addrconf_ip6_tnl_config(struct net_device *dev)
2107 {
2108 struct inet6_dev *idev;
2109
2110 ASSERT_RTNL();
2111
2112 if ((idev = addrconf_add_dev(dev)) == NULL) {
2113 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2114 return;
2115 }
2116 ip6_tnl_add_linklocal(idev);
2117 addrconf_add_mroute(dev);
2118 }
2119
2120 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2121 void * data)
2122 {
2123 struct net_device *dev = (struct net_device *) data;
2124 struct inet6_dev *idev = __in6_dev_get(dev);
2125
2126 switch(event) {
2127 case NETDEV_UP:
2128 switch(dev->type) {
2129 case ARPHRD_SIT:
2130 addrconf_sit_config(dev);
2131 break;
2132 case ARPHRD_TUNNEL6:
2133 addrconf_ip6_tnl_config(dev);
2134 break;
2135 case ARPHRD_LOOPBACK:
2136 init_loopback(dev);
2137 break;
2138
2139 default:
2140 addrconf_dev_config(dev);
2141 break;
2142 };
2143 if (idev) {
2144 /* If the MTU changed during the interface down, when the
2145 interface up, the changed MTU must be reflected in the
2146 idev as well as routers.
2147 */
2148 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2149 rt6_mtu_change(dev, dev->mtu);
2150 idev->cnf.mtu6 = dev->mtu;
2151 }
2152 idev->tstamp = jiffies;
2153 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2154 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2155 stop IPv6 on this interface.
2156 */
2157 if (dev->mtu < IPV6_MIN_MTU)
2158 addrconf_ifdown(dev, event != NETDEV_DOWN);
2159 }
2160 break;
2161
2162 case NETDEV_CHANGEMTU:
2163 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2164 rt6_mtu_change(dev, dev->mtu);
2165 idev->cnf.mtu6 = dev->mtu;
2166 break;
2167 }
2168
2169 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2170
2171 case NETDEV_DOWN:
2172 case NETDEV_UNREGISTER:
2173 /*
2174 * Remove all addresses from this interface.
2175 */
2176 addrconf_ifdown(dev, event != NETDEV_DOWN);
2177 break;
2178 case NETDEV_CHANGE:
2179 break;
2180 case NETDEV_CHANGENAME:
2181 #ifdef CONFIG_SYSCTL
2182 if (idev) {
2183 addrconf_sysctl_unregister(&idev->cnf);
2184 neigh_sysctl_unregister(idev->nd_parms);
2185 neigh_sysctl_register(dev, idev->nd_parms,
2186 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2187 &ndisc_ifinfo_sysctl_change,
2188 NULL);
2189 addrconf_sysctl_register(idev, &idev->cnf);
2190 }
2191 #endif
2192 break;
2193 };
2194
2195 return NOTIFY_OK;
2196 }
2197
2198 /*
2199 * addrconf module should be notified of a device going up
2200 */
2201 static struct notifier_block ipv6_dev_notf = {
2202 .notifier_call = addrconf_notify,
2203 .priority = 0
2204 };
2205
2206 static int addrconf_ifdown(struct net_device *dev, int how)
2207 {
2208 struct inet6_dev *idev;
2209 struct inet6_ifaddr *ifa, **bifa;
2210 int i;
2211
2212 ASSERT_RTNL();
2213
2214 if (dev == &loopback_dev && how == 1)
2215 how = 0;
2216
2217 rt6_ifdown(dev);
2218 neigh_ifdown(&nd_tbl, dev);
2219
2220 idev = __in6_dev_get(dev);
2221 if (idev == NULL)
2222 return -ENODEV;
2223
2224 /* Step 1: remove reference to ipv6 device from parent device.
2225 Do not dev_put!
2226 */
2227 if (how == 1) {
2228 write_lock_bh(&addrconf_lock);
2229 dev->ip6_ptr = NULL;
2230 idev->dead = 1;
2231 write_unlock_bh(&addrconf_lock);
2232
2233 /* Step 1.5: remove snmp6 entry */
2234 snmp6_unregister_dev(idev);
2235
2236 }
2237
2238 /* Step 2: clear hash table */
2239 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2240 bifa = &inet6_addr_lst[i];
2241
2242 write_lock_bh(&addrconf_hash_lock);
2243 while ((ifa = *bifa) != NULL) {
2244 if (ifa->idev == idev) {
2245 *bifa = ifa->lst_next;
2246 ifa->lst_next = NULL;
2247 addrconf_del_timer(ifa);
2248 in6_ifa_put(ifa);
2249 continue;
2250 }
2251 bifa = &ifa->lst_next;
2252 }
2253 write_unlock_bh(&addrconf_hash_lock);
2254 }
2255
2256 write_lock_bh(&idev->lock);
2257
2258 /* Step 3: clear flags for stateless addrconf */
2259 if (how != 1)
2260 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD);
2261
2262 /* Step 4: clear address list */
2263 #ifdef CONFIG_IPV6_PRIVACY
2264 if (how == 1 && del_timer(&idev->regen_timer))
2265 in6_dev_put(idev);
2266
2267 /* clear tempaddr list */
2268 while ((ifa = idev->tempaddr_list) != NULL) {
2269 idev->tempaddr_list = ifa->tmp_next;
2270 ifa->tmp_next = NULL;
2271 ifa->dead = 1;
2272 write_unlock_bh(&idev->lock);
2273 spin_lock_bh(&ifa->lock);
2274
2275 if (ifa->ifpub) {
2276 in6_ifa_put(ifa->ifpub);
2277 ifa->ifpub = NULL;
2278 }
2279 spin_unlock_bh(&ifa->lock);
2280 in6_ifa_put(ifa);
2281 write_lock_bh(&idev->lock);
2282 }
2283 #endif
2284 while ((ifa = idev->addr_list) != NULL) {
2285 idev->addr_list = ifa->if_next;
2286 ifa->if_next = NULL;
2287 ifa->dead = 1;
2288 addrconf_del_timer(ifa);
2289 write_unlock_bh(&idev->lock);
2290
2291 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2292 in6_ifa_put(ifa);
2293
2294 write_lock_bh(&idev->lock);
2295 }
2296 write_unlock_bh(&idev->lock);
2297
2298 /* Step 5: Discard multicast list */
2299
2300 if (how == 1)
2301 ipv6_mc_destroy_dev(idev);
2302 else
2303 ipv6_mc_down(idev);
2304
2305 /* Step 5: netlink notification of this interface */
2306 idev->tstamp = jiffies;
2307 inet6_ifinfo_notify(RTM_DELLINK, idev);
2308
2309 /* Shot the device (if unregistered) */
2310
2311 if (how == 1) {
2312 #ifdef CONFIG_SYSCTL
2313 addrconf_sysctl_unregister(&idev->cnf);
2314 neigh_sysctl_unregister(idev->nd_parms);
2315 #endif
2316 neigh_parms_release(&nd_tbl, idev->nd_parms);
2317 neigh_ifdown(&nd_tbl, dev);
2318 in6_dev_put(idev);
2319 }
2320 return 0;
2321 }
2322
2323 static void addrconf_rs_timer(unsigned long data)
2324 {
2325 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2326
2327 if (ifp->idev->cnf.forwarding)
2328 goto out;
2329
2330 if (ifp->idev->if_flags & IF_RA_RCVD) {
2331 /*
2332 * Announcement received after solicitation
2333 * was sent
2334 */
2335 goto out;
2336 }
2337
2338 spin_lock(&ifp->lock);
2339 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2340 struct in6_addr all_routers;
2341
2342 /* The wait after the last probe can be shorter */
2343 addrconf_mod_timer(ifp, AC_RS,
2344 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2345 ifp->idev->cnf.rtr_solicit_delay :
2346 ifp->idev->cnf.rtr_solicit_interval);
2347 spin_unlock(&ifp->lock);
2348
2349 ipv6_addr_all_routers(&all_routers);
2350
2351 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2352 } else {
2353 spin_unlock(&ifp->lock);
2354 /*
2355 * Note: we do not support deprecated "all on-link"
2356 * assumption any longer.
2357 */
2358 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2359 ifp->idev->dev->name);
2360 }
2361
2362 out:
2363 in6_ifa_put(ifp);
2364 }
2365
2366 /*
2367 * Duplicate Address Detection
2368 */
2369 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2370 {
2371 struct inet6_dev *idev = ifp->idev;
2372 struct net_device *dev = idev->dev;
2373 unsigned long rand_num;
2374
2375 addrconf_join_solict(dev, &ifp->addr);
2376
2377 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2378 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2379 flags);
2380
2381 net_srandom(ifp->addr.s6_addr32[3]);
2382 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2383
2384 read_lock_bh(&idev->lock);
2385 if (ifp->dead)
2386 goto out;
2387 spin_lock_bh(&ifp->lock);
2388
2389 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2390 !(ifp->flags&IFA_F_TENTATIVE)) {
2391 ifp->flags &= ~IFA_F_TENTATIVE;
2392 spin_unlock_bh(&ifp->lock);
2393 read_unlock_bh(&idev->lock);
2394
2395 addrconf_dad_completed(ifp);
2396 return;
2397 }
2398
2399 ifp->probes = idev->cnf.dad_transmits;
2400 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2401
2402 spin_unlock_bh(&ifp->lock);
2403 out:
2404 read_unlock_bh(&idev->lock);
2405 }
2406
2407 static void addrconf_dad_timer(unsigned long data)
2408 {
2409 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2410 struct inet6_dev *idev = ifp->idev;
2411 struct in6_addr unspec;
2412 struct in6_addr mcaddr;
2413
2414 read_lock_bh(&idev->lock);
2415 if (idev->dead) {
2416 read_unlock_bh(&idev->lock);
2417 goto out;
2418 }
2419 spin_lock_bh(&ifp->lock);
2420 if (ifp->probes == 0) {
2421 /*
2422 * DAD was successful
2423 */
2424
2425 ifp->flags &= ~IFA_F_TENTATIVE;
2426 spin_unlock_bh(&ifp->lock);
2427 read_unlock_bh(&idev->lock);
2428
2429 addrconf_dad_completed(ifp);
2430
2431 goto out;
2432 }
2433
2434 ifp->probes--;
2435 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2436 spin_unlock_bh(&ifp->lock);
2437 read_unlock_bh(&idev->lock);
2438
2439 /* send a neighbour solicitation for our addr */
2440 memset(&unspec, 0, sizeof(unspec));
2441 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2442 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2443 out:
2444 in6_ifa_put(ifp);
2445 }
2446
2447 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2448 {
2449 struct net_device * dev = ifp->idev->dev;
2450
2451 /*
2452 * Configure the address for reception. Now it is valid.
2453 */
2454
2455 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2456
2457 /* If added prefix is link local and forwarding is off,
2458 start sending router solicitations.
2459 */
2460
2461 if (ifp->idev->cnf.forwarding == 0 &&
2462 ifp->idev->cnf.rtr_solicits > 0 &&
2463 (dev->flags&IFF_LOOPBACK) == 0 &&
2464 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2465 struct in6_addr all_routers;
2466
2467 ipv6_addr_all_routers(&all_routers);
2468
2469 /*
2470 * If a host as already performed a random delay
2471 * [...] as part of DAD [...] there is no need
2472 * to delay again before sending the first RS
2473 */
2474 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2475
2476 spin_lock_bh(&ifp->lock);
2477 ifp->probes = 1;
2478 ifp->idev->if_flags |= IF_RS_SENT;
2479 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2480 spin_unlock_bh(&ifp->lock);
2481 }
2482 }
2483
2484 #ifdef CONFIG_PROC_FS
2485 struct if6_iter_state {
2486 int bucket;
2487 };
2488
2489 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2490 {
2491 struct inet6_ifaddr *ifa = NULL;
2492 struct if6_iter_state *state = seq->private;
2493
2494 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2495 ifa = inet6_addr_lst[state->bucket];
2496 if (ifa)
2497 break;
2498 }
2499 return ifa;
2500 }
2501
2502 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2503 {
2504 struct if6_iter_state *state = seq->private;
2505
2506 ifa = ifa->lst_next;
2507 try_again:
2508 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2509 ifa = inet6_addr_lst[state->bucket];
2510 goto try_again;
2511 }
2512 return ifa;
2513 }
2514
2515 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2516 {
2517 struct inet6_ifaddr *ifa = if6_get_first(seq);
2518
2519 if (ifa)
2520 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2521 --pos;
2522 return pos ? NULL : ifa;
2523 }
2524
2525 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2526 {
2527 read_lock_bh(&addrconf_hash_lock);
2528 return if6_get_idx(seq, *pos);
2529 }
2530
2531 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2532 {
2533 struct inet6_ifaddr *ifa;
2534
2535 ifa = if6_get_next(seq, v);
2536 ++*pos;
2537 return ifa;
2538 }
2539
2540 static void if6_seq_stop(struct seq_file *seq, void *v)
2541 {
2542 read_unlock_bh(&addrconf_hash_lock);
2543 }
2544
2545 static int if6_seq_show(struct seq_file *seq, void *v)
2546 {
2547 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2548 seq_printf(seq,
2549 "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n",
2550 NIP6(ifp->addr),
2551 ifp->idev->dev->ifindex,
2552 ifp->prefix_len,
2553 ifp->scope,
2554 ifp->flags,
2555 ifp->idev->dev->name);
2556 return 0;
2557 }
2558
2559 static struct seq_operations if6_seq_ops = {
2560 .start = if6_seq_start,
2561 .next = if6_seq_next,
2562 .show = if6_seq_show,
2563 .stop = if6_seq_stop,
2564 };
2565
2566 static int if6_seq_open(struct inode *inode, struct file *file)
2567 {
2568 struct seq_file *seq;
2569 int rc = -ENOMEM;
2570 struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2571
2572 if (!s)
2573 goto out;
2574 memset(s, 0, sizeof(*s));
2575
2576 rc = seq_open(file, &if6_seq_ops);
2577 if (rc)
2578 goto out_kfree;
2579
2580 seq = file->private_data;
2581 seq->private = s;
2582 out:
2583 return rc;
2584 out_kfree:
2585 kfree(s);
2586 goto out;
2587 }
2588
2589 static struct file_operations if6_fops = {
2590 .owner = THIS_MODULE,
2591 .open = if6_seq_open,
2592 .read = seq_read,
2593 .llseek = seq_lseek,
2594 .release = seq_release_private,
2595 };
2596
2597 int __init if6_proc_init(void)
2598 {
2599 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2600 return -ENOMEM;
2601 return 0;
2602 }
2603
2604 void if6_proc_exit(void)
2605 {
2606 proc_net_remove("if_inet6");
2607 }
2608 #endif /* CONFIG_PROC_FS */
2609
2610 /*
2611 * Periodic address status verification
2612 */
2613
2614 static void addrconf_verify(unsigned long foo)
2615 {
2616 struct inet6_ifaddr *ifp;
2617 unsigned long now, next;
2618 int i;
2619
2620 spin_lock_bh(&addrconf_verify_lock);
2621 now = jiffies;
2622 next = now + ADDR_CHECK_FREQUENCY;
2623
2624 del_timer(&addr_chk_timer);
2625
2626 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2627
2628 restart:
2629 write_lock(&addrconf_hash_lock);
2630 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2631 unsigned long age;
2632 #ifdef CONFIG_IPV6_PRIVACY
2633 unsigned long regen_advance;
2634 #endif
2635
2636 if (ifp->flags & IFA_F_PERMANENT)
2637 continue;
2638
2639 spin_lock(&ifp->lock);
2640 age = (now - ifp->tstamp) / HZ;
2641
2642 #ifdef CONFIG_IPV6_PRIVACY
2643 regen_advance = ifp->idev->cnf.regen_max_retry *
2644 ifp->idev->cnf.dad_transmits *
2645 ifp->idev->nd_parms->retrans_time / HZ;
2646 #endif
2647
2648 if (age >= ifp->valid_lft) {
2649 spin_unlock(&ifp->lock);
2650 in6_ifa_hold(ifp);
2651 write_unlock(&addrconf_hash_lock);
2652 ipv6_del_addr(ifp);
2653 goto restart;
2654 } else if (age >= ifp->prefered_lft) {
2655 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2656 int deprecate = 0;
2657
2658 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2659 deprecate = 1;
2660 ifp->flags |= IFA_F_DEPRECATED;
2661 }
2662
2663 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2664 next = ifp->tstamp + ifp->valid_lft * HZ;
2665
2666 spin_unlock(&ifp->lock);
2667
2668 if (deprecate) {
2669 in6_ifa_hold(ifp);
2670 write_unlock(&addrconf_hash_lock);
2671
2672 ipv6_ifa_notify(0, ifp);
2673 in6_ifa_put(ifp);
2674 goto restart;
2675 }
2676 #ifdef CONFIG_IPV6_PRIVACY
2677 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2678 !(ifp->flags&IFA_F_TENTATIVE)) {
2679 if (age >= ifp->prefered_lft - regen_advance) {
2680 struct inet6_ifaddr *ifpub = ifp->ifpub;
2681 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2682 next = ifp->tstamp + ifp->prefered_lft * HZ;
2683 if (!ifp->regen_count && ifpub) {
2684 ifp->regen_count++;
2685 in6_ifa_hold(ifp);
2686 in6_ifa_hold(ifpub);
2687 spin_unlock(&ifp->lock);
2688 write_unlock(&addrconf_hash_lock);
2689 ipv6_create_tempaddr(ifpub, ifp);
2690 in6_ifa_put(ifpub);
2691 in6_ifa_put(ifp);
2692 goto restart;
2693 }
2694 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2695 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2696 spin_unlock(&ifp->lock);
2697 #endif
2698 } else {
2699 /* ifp->prefered_lft <= ifp->valid_lft */
2700 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2701 next = ifp->tstamp + ifp->prefered_lft * HZ;
2702 spin_unlock(&ifp->lock);
2703 }
2704 }
2705 write_unlock(&addrconf_hash_lock);
2706 }
2707
2708 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2709 add_timer(&addr_chk_timer);
2710 spin_unlock_bh(&addrconf_verify_lock);
2711 }
2712
2713 static int
2714 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2715 {
2716 struct rtattr **rta = arg;
2717 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2718 struct in6_addr *pfx;
2719
2720 pfx = NULL;
2721 if (rta[IFA_ADDRESS-1]) {
2722 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2723 return -EINVAL;
2724 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2725 }
2726 if (rta[IFA_LOCAL-1]) {
2727 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2728 return -EINVAL;
2729 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2730 }
2731 if (pfx == NULL)
2732 return -EINVAL;
2733
2734 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2735 }
2736
2737 static int
2738 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2739 {
2740 struct rtattr **rta = arg;
2741 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2742 struct in6_addr *pfx;
2743
2744 pfx = NULL;
2745 if (rta[IFA_ADDRESS-1]) {
2746 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2747 return -EINVAL;
2748 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2749 }
2750 if (rta[IFA_LOCAL-1]) {
2751 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2752 return -EINVAL;
2753 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2754 }
2755 if (pfx == NULL)
2756 return -EINVAL;
2757
2758 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2759 }
2760
2761 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2762 u32 pid, u32 seq, int event, unsigned int flags)
2763 {
2764 struct ifaddrmsg *ifm;
2765 struct nlmsghdr *nlh;
2766 struct ifa_cacheinfo ci;
2767 unsigned char *b = skb->tail;
2768
2769 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2770 ifm = NLMSG_DATA(nlh);
2771 ifm->ifa_family = AF_INET6;
2772 ifm->ifa_prefixlen = ifa->prefix_len;
2773 ifm->ifa_flags = ifa->flags;
2774 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2775 if (ifa->scope&IFA_HOST)
2776 ifm->ifa_scope = RT_SCOPE_HOST;
2777 else if (ifa->scope&IFA_LINK)
2778 ifm->ifa_scope = RT_SCOPE_LINK;
2779 else if (ifa->scope&IFA_SITE)
2780 ifm->ifa_scope = RT_SCOPE_SITE;
2781 ifm->ifa_index = ifa->idev->dev->ifindex;
2782 RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2783 if (!(ifa->flags&IFA_F_PERMANENT)) {
2784 ci.ifa_prefered = ifa->prefered_lft;
2785 ci.ifa_valid = ifa->valid_lft;
2786 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2787 long tval = (jiffies - ifa->tstamp)/HZ;
2788 ci.ifa_prefered -= tval;
2789 if (ci.ifa_valid != INFINITY_LIFE_TIME)
2790 ci.ifa_valid -= tval;
2791 }
2792 } else {
2793 ci.ifa_prefered = INFINITY_LIFE_TIME;
2794 ci.ifa_valid = INFINITY_LIFE_TIME;
2795 }
2796 ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2797 + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2798 ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2799 + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2800 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2801 nlh->nlmsg_len = skb->tail - b;
2802 return skb->len;
2803
2804 nlmsg_failure:
2805 rtattr_failure:
2806 skb_trim(skb, b - skb->data);
2807 return -1;
2808 }
2809
2810 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2811 u32 pid, u32 seq, int event, u16 flags)
2812 {
2813 struct ifaddrmsg *ifm;
2814 struct nlmsghdr *nlh;
2815 struct ifa_cacheinfo ci;
2816 unsigned char *b = skb->tail;
2817
2818 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2819 ifm = NLMSG_DATA(nlh);
2820 ifm->ifa_family = AF_INET6;
2821 ifm->ifa_prefixlen = 128;
2822 ifm->ifa_flags = IFA_F_PERMANENT;
2823 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2824 if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2825 ifm->ifa_scope = RT_SCOPE_SITE;
2826 ifm->ifa_index = ifmca->idev->dev->ifindex;
2827 RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2828 ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2829 * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2830 * 100 / HZ);
2831 ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2832 * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2833 * 100 / HZ);
2834 ci.ifa_prefered = INFINITY_LIFE_TIME;
2835 ci.ifa_valid = INFINITY_LIFE_TIME;
2836 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2837 nlh->nlmsg_len = skb->tail - b;
2838 return skb->len;
2839
2840 nlmsg_failure:
2841 rtattr_failure:
2842 skb_trim(skb, b - skb->data);
2843 return -1;
2844 }
2845
2846 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2847 u32 pid, u32 seq, int event, unsigned int flags)
2848 {
2849 struct ifaddrmsg *ifm;
2850 struct nlmsghdr *nlh;
2851 struct ifa_cacheinfo ci;
2852 unsigned char *b = skb->tail;
2853
2854 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2855 ifm = NLMSG_DATA(nlh);
2856 ifm->ifa_family = AF_INET6;
2857 ifm->ifa_prefixlen = 128;
2858 ifm->ifa_flags = IFA_F_PERMANENT;
2859 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2860 if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2861 ifm->ifa_scope = RT_SCOPE_SITE;
2862 ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2863 RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2864 ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2865 * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2866 * 100 / HZ);
2867 ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2868 * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2869 * 100 / HZ);
2870 ci.ifa_prefered = INFINITY_LIFE_TIME;
2871 ci.ifa_valid = INFINITY_LIFE_TIME;
2872 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2873 nlh->nlmsg_len = skb->tail - b;
2874 return skb->len;
2875
2876 nlmsg_failure:
2877 rtattr_failure:
2878 skb_trim(skb, b - skb->data);
2879 return -1;
2880 }
2881
2882 enum addr_type_t
2883 {
2884 UNICAST_ADDR,
2885 MULTICAST_ADDR,
2886 ANYCAST_ADDR,
2887 };
2888
2889 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2890 enum addr_type_t type)
2891 {
2892 int idx, ip_idx;
2893 int s_idx, s_ip_idx;
2894 int err = 1;
2895 struct net_device *dev;
2896 struct inet6_dev *idev = NULL;
2897 struct inet6_ifaddr *ifa;
2898 struct ifmcaddr6 *ifmca;
2899 struct ifacaddr6 *ifaca;
2900
2901 s_idx = cb->args[0];
2902 s_ip_idx = ip_idx = cb->args[1];
2903 read_lock(&dev_base_lock);
2904
2905 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
2906 if (idx < s_idx)
2907 continue;
2908 if (idx > s_idx)
2909 s_ip_idx = 0;
2910 ip_idx = 0;
2911 if ((idev = in6_dev_get(dev)) == NULL)
2912 continue;
2913 read_lock_bh(&idev->lock);
2914 switch (type) {
2915 case UNICAST_ADDR:
2916 /* unicast address incl. temp addr */
2917 for (ifa = idev->addr_list; ifa;
2918 ifa = ifa->if_next, ip_idx++) {
2919 if (ip_idx < s_ip_idx)
2920 continue;
2921 if ((err = inet6_fill_ifaddr(skb, ifa,
2922 NETLINK_CB(cb->skb).pid,
2923 cb->nlh->nlmsg_seq, RTM_NEWADDR,
2924 NLM_F_MULTI)) <= 0)
2925 goto done;
2926 }
2927 break;
2928 case MULTICAST_ADDR:
2929 /* multicast address */
2930 for (ifmca = idev->mc_list; ifmca;
2931 ifmca = ifmca->next, ip_idx++) {
2932 if (ip_idx < s_ip_idx)
2933 continue;
2934 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
2935 NETLINK_CB(cb->skb).pid,
2936 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
2937 NLM_F_MULTI)) <= 0)
2938 goto done;
2939 }
2940 break;
2941 case ANYCAST_ADDR:
2942 /* anycast address */
2943 for (ifaca = idev->ac_list; ifaca;
2944 ifaca = ifaca->aca_next, ip_idx++) {
2945 if (ip_idx < s_ip_idx)
2946 continue;
2947 if ((err = inet6_fill_ifacaddr(skb, ifaca,
2948 NETLINK_CB(cb->skb).pid,
2949 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
2950 NLM_F_MULTI)) <= 0)
2951 goto done;
2952 }
2953 break;
2954 default:
2955 break;
2956 }
2957 read_unlock_bh(&idev->lock);
2958 in6_dev_put(idev);
2959 }
2960 done:
2961 if (err <= 0) {
2962 read_unlock_bh(&idev->lock);
2963 in6_dev_put(idev);
2964 }
2965 read_unlock(&dev_base_lock);
2966 cb->args[0] = idx;
2967 cb->args[1] = ip_idx;
2968 return skb->len;
2969 }
2970
2971 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
2972 {
2973 enum addr_type_t type = UNICAST_ADDR;
2974 return inet6_dump_addr(skb, cb, type);
2975 }
2976
2977 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
2978 {
2979 enum addr_type_t type = MULTICAST_ADDR;
2980 return inet6_dump_addr(skb, cb, type);
2981 }
2982
2983
2984 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
2985 {
2986 enum addr_type_t type = ANYCAST_ADDR;
2987 return inet6_dump_addr(skb, cb, type);
2988 }
2989
2990 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
2991 {
2992 struct sk_buff *skb;
2993 int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
2994
2995 skb = alloc_skb(size, GFP_ATOMIC);
2996 if (!skb) {
2997 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
2998 return;
2999 }
3000 if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
3001 kfree_skb(skb);
3002 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
3003 return;
3004 }
3005 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3006 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
3007 }
3008
3009 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3010 __s32 *array, int bytes)
3011 {
3012 memset(array, 0, bytes);
3013 array[DEVCONF_FORWARDING] = cnf->forwarding;
3014 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3015 array[DEVCONF_MTU6] = cnf->mtu6;
3016 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3017 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3018 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3019 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3020 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3021 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3022 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3023 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3024 #ifdef CONFIG_IPV6_PRIVACY
3025 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3026 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3027 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3028 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3029 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3030 #endif
3031 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3032 }
3033
3034 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3035 u32 pid, u32 seq, int event, unsigned int flags)
3036 {
3037 struct net_device *dev = idev->dev;
3038 __s32 *array = NULL;
3039 struct ifinfomsg *r;
3040 struct nlmsghdr *nlh;
3041 unsigned char *b = skb->tail;
3042 struct rtattr *subattr;
3043 __u32 mtu = dev->mtu;
3044 struct ifla_cacheinfo ci;
3045
3046 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3047 r = NLMSG_DATA(nlh);
3048 r->ifi_family = AF_INET6;
3049 r->__ifi_pad = 0;
3050 r->ifi_type = dev->type;
3051 r->ifi_index = dev->ifindex;
3052 r->ifi_flags = dev_get_flags(dev);
3053 r->ifi_change = 0;
3054
3055 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3056
3057 if (dev->addr_len)
3058 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3059
3060 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3061 if (dev->ifindex != dev->iflink)
3062 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3063
3064 subattr = (struct rtattr*)skb->tail;
3065
3066 RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3067
3068 /* return the device flags */
3069 RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3070
3071 /* return interface cacheinfo */
3072 ci.max_reasm_len = IPV6_MAXPLEN;
3073 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3074 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3075 ci.reachable_time = idev->nd_parms->reachable_time;
3076 ci.retrans_time = idev->nd_parms->retrans_time;
3077 RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3078
3079 /* return the device sysctl params */
3080 if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3081 goto rtattr_failure;
3082 ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3083 RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3084
3085 /* XXX - Statistics/MC not implemented */
3086 subattr->rta_len = skb->tail - (u8*)subattr;
3087
3088 nlh->nlmsg_len = skb->tail - b;
3089 kfree(array);
3090 return skb->len;
3091
3092 nlmsg_failure:
3093 rtattr_failure:
3094 kfree(array);
3095 skb_trim(skb, b - skb->data);
3096 return -1;
3097 }
3098
3099 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3100 {
3101 int idx, err;
3102 int s_idx = cb->args[0];
3103 struct net_device *dev;
3104 struct inet6_dev *idev;
3105
3106 read_lock(&dev_base_lock);
3107 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3108 if (idx < s_idx)
3109 continue;
3110 if ((idev = in6_dev_get(dev)) == NULL)
3111 continue;
3112 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3113 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3114 in6_dev_put(idev);
3115 if (err <= 0)
3116 break;
3117 }
3118 read_unlock(&dev_base_lock);
3119 cb->args[0] = idx;
3120
3121 return skb->len;
3122 }
3123
3124 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3125 {
3126 struct sk_buff *skb;
3127 /* 128 bytes ?? */
3128 int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
3129
3130 skb = alloc_skb(size, GFP_ATOMIC);
3131 if (!skb) {
3132 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
3133 return;
3134 }
3135 if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3136 kfree_skb(skb);
3137 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3138 return;
3139 }
3140 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3141 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3142 }
3143
3144 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3145 struct prefix_info *pinfo, u32 pid, u32 seq,
3146 int event, unsigned int flags)
3147 {
3148 struct prefixmsg *pmsg;
3149 struct nlmsghdr *nlh;
3150 unsigned char *b = skb->tail;
3151 struct prefix_cacheinfo ci;
3152
3153 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3154 pmsg = NLMSG_DATA(nlh);
3155 pmsg->prefix_family = AF_INET6;
3156 pmsg->prefix_pad1 = 0;
3157 pmsg->prefix_pad2 = 0;
3158 pmsg->prefix_ifindex = idev->dev->ifindex;
3159 pmsg->prefix_len = pinfo->prefix_len;
3160 pmsg->prefix_type = pinfo->type;
3161 pmsg->prefix_pad3 = 0;
3162
3163 pmsg->prefix_flags = 0;
3164 if (pinfo->onlink)
3165 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3166 if (pinfo->autoconf)
3167 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3168
3169 RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3170
3171 ci.preferred_time = ntohl(pinfo->prefered);
3172 ci.valid_time = ntohl(pinfo->valid);
3173 RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3174
3175 nlh->nlmsg_len = skb->tail - b;
3176 return skb->len;
3177
3178 nlmsg_failure:
3179 rtattr_failure:
3180 skb_trim(skb, b - skb->data);
3181 return -1;
3182 }
3183
3184 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3185 struct prefix_info *pinfo)
3186 {
3187 struct sk_buff *skb;
3188 int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3189
3190 skb = alloc_skb(size, GFP_ATOMIC);
3191 if (!skb) {
3192 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3193 return;
3194 }
3195 if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3196 kfree_skb(skb);
3197 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3198 return;
3199 }
3200 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3201 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3202 }
3203
3204 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3205 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, },
3206 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, },
3207 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, },
3208 [RTM_GETADDR - RTM_BASE] = { .dumpit = inet6_dump_ifaddr, },
3209 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3210 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3211 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, },
3212 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, },
3213 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute,
3214 .dumpit = inet6_dump_fib, },
3215 };
3216
3217 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3218 {
3219 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3220
3221 switch (event) {
3222 case RTM_NEWADDR:
3223 dst_hold(&ifp->rt->u.dst);
3224 if (ip6_ins_rt(ifp->rt, NULL, NULL, NULL))
3225 dst_release(&ifp->rt->u.dst);
3226 if (ifp->idev->cnf.forwarding)
3227 addrconf_join_anycast(ifp);
3228 break;
3229 case RTM_DELADDR:
3230 if (ifp->idev->cnf.forwarding)
3231 addrconf_leave_anycast(ifp);
3232 addrconf_leave_solict(ifp->idev, &ifp->addr);
3233 dst_hold(&ifp->rt->u.dst);
3234 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3235 dst_free(&ifp->rt->u.dst);
3236 else
3237 dst_release(&ifp->rt->u.dst);
3238 break;
3239 }
3240 }
3241
3242 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3243 {
3244 read_lock_bh(&addrconf_lock);
3245 if (likely(ifp->idev->dead == 0))
3246 __ipv6_ifa_notify(event, ifp);
3247 read_unlock_bh(&addrconf_lock);
3248 }
3249
3250 #ifdef CONFIG_SYSCTL
3251
3252 static
3253 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3254 void __user *buffer, size_t *lenp, loff_t *ppos)
3255 {
3256 int *valp = ctl->data;
3257 int val = *valp;
3258 int ret;
3259
3260 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3261
3262 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3263 if (valp != &ipv6_devconf.forwarding) {
3264 if ((!*valp) ^ (!val)) {
3265 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3266 if (idev == NULL)
3267 return ret;
3268 dev_forward_change(idev);
3269 }
3270 } else {
3271 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3272 addrconf_forward_change();
3273 }
3274 if (*valp)
3275 rt6_purge_dflt_routers();
3276 }
3277
3278 return ret;
3279 }
3280
3281 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3282 int __user *name, int nlen,
3283 void __user *oldval,
3284 size_t __user *oldlenp,
3285 void __user *newval, size_t newlen,
3286 void **context)
3287 {
3288 int *valp = table->data;
3289 int new;
3290
3291 if (!newval || !newlen)
3292 return 0;
3293 if (newlen != sizeof(int))
3294 return -EINVAL;
3295 if (get_user(new, (int __user *)newval))
3296 return -EFAULT;
3297 if (new == *valp)
3298 return 0;
3299 if (oldval && oldlenp) {
3300 size_t len;
3301 if (get_user(len, oldlenp))
3302 return -EFAULT;
3303 if (len) {
3304 if (len > table->maxlen)
3305 len = table->maxlen;
3306 if (copy_to_user(oldval, valp, len))
3307 return -EFAULT;
3308 if (put_user(len, oldlenp))
3309 return -EFAULT;
3310 }
3311 }
3312
3313 if (valp != &ipv6_devconf_dflt.forwarding) {
3314 if (valp != &ipv6_devconf.forwarding) {
3315 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3316 int changed;
3317 if (unlikely(idev == NULL))
3318 return -ENODEV;
3319 changed = (!*valp) ^ (!new);
3320 *valp = new;
3321 if (changed)
3322 dev_forward_change(idev);
3323 } else {
3324 *valp = new;
3325 addrconf_forward_change();
3326 }
3327
3328 if (*valp)
3329 rt6_purge_dflt_routers();
3330 } else
3331 *valp = new;
3332
3333 return 1;
3334 }
3335
3336 static struct addrconf_sysctl_table
3337 {
3338 struct ctl_table_header *sysctl_header;
3339 ctl_table addrconf_vars[__NET_IPV6_MAX];
3340 ctl_table addrconf_dev[2];
3341 ctl_table addrconf_conf_dir[2];
3342 ctl_table addrconf_proto_dir[2];
3343 ctl_table addrconf_root_dir[2];
3344 } addrconf_sysctl = {
3345 .sysctl_header = NULL,
3346 .addrconf_vars = {
3347 {
3348 .ctl_name = NET_IPV6_FORWARDING,
3349 .procname = "forwarding",
3350 .data = &ipv6_devconf.forwarding,
3351 .maxlen = sizeof(int),
3352 .mode = 0644,
3353 .proc_handler = &addrconf_sysctl_forward,
3354 .strategy = &addrconf_sysctl_forward_strategy,
3355 },
3356 {
3357 .ctl_name = NET_IPV6_HOP_LIMIT,
3358 .procname = "hop_limit",
3359 .data = &ipv6_devconf.hop_limit,
3360 .maxlen = sizeof(int),
3361 .mode = 0644,
3362 .proc_handler = proc_dointvec,
3363 },
3364 {
3365 .ctl_name = NET_IPV6_MTU,
3366 .procname = "mtu",
3367 .data = &ipv6_devconf.mtu6,
3368 .maxlen = sizeof(int),
3369 .mode = 0644,
3370 .proc_handler = &proc_dointvec,
3371 },
3372 {
3373 .ctl_name = NET_IPV6_ACCEPT_RA,
3374 .procname = "accept_ra",
3375 .data = &ipv6_devconf.accept_ra,
3376 .maxlen = sizeof(int),
3377 .mode = 0644,
3378 .proc_handler = &proc_dointvec,
3379 },
3380 {
3381 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3382 .procname = "accept_redirects",
3383 .data = &ipv6_devconf.accept_redirects,
3384 .maxlen = sizeof(int),
3385 .mode = 0644,
3386 .proc_handler = &proc_dointvec,
3387 },
3388 {
3389 .ctl_name = NET_IPV6_AUTOCONF,
3390 .procname = "autoconf",
3391 .data = &ipv6_devconf.autoconf,
3392 .maxlen = sizeof(int),
3393 .mode = 0644,
3394 .proc_handler = &proc_dointvec,
3395 },
3396 {
3397 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3398 .procname = "dad_transmits",
3399 .data = &ipv6_devconf.dad_transmits,
3400 .maxlen = sizeof(int),
3401 .mode = 0644,
3402 .proc_handler = &proc_dointvec,
3403 },
3404 {
3405 .ctl_name = NET_IPV6_RTR_SOLICITS,
3406 .procname = "router_solicitations",
3407 .data = &ipv6_devconf.rtr_solicits,
3408 .maxlen = sizeof(int),
3409 .mode = 0644,
3410 .proc_handler = &proc_dointvec,
3411 },
3412 {
3413 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3414 .procname = "router_solicitation_interval",
3415 .data = &ipv6_devconf.rtr_solicit_interval,
3416 .maxlen = sizeof(int),
3417 .mode = 0644,
3418 .proc_handler = &proc_dointvec_jiffies,
3419 .strategy = &sysctl_jiffies,
3420 },
3421 {
3422 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3423 .procname = "router_solicitation_delay",
3424 .data = &ipv6_devconf.rtr_solicit_delay,
3425 .maxlen = sizeof(int),
3426 .mode = 0644,
3427 .proc_handler = &proc_dointvec_jiffies,
3428 .strategy = &sysctl_jiffies,
3429 },
3430 {
3431 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3432 .procname = "force_mld_version",
3433 .data = &ipv6_devconf.force_mld_version,
3434 .maxlen = sizeof(int),
3435 .mode = 0644,
3436 .proc_handler = &proc_dointvec,
3437 },
3438 #ifdef CONFIG_IPV6_PRIVACY
3439 {
3440 .ctl_name = NET_IPV6_USE_TEMPADDR,
3441 .procname = "use_tempaddr",
3442 .data = &ipv6_devconf.use_tempaddr,
3443 .maxlen = sizeof(int),
3444 .mode = 0644,
3445 .proc_handler = &proc_dointvec,
3446 },
3447 {
3448 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3449 .procname = "temp_valid_lft",
3450 .data = &ipv6_devconf.temp_valid_lft,
3451 .maxlen = sizeof(int),
3452 .mode = 0644,
3453 .proc_handler = &proc_dointvec,
3454 },
3455 {
3456 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3457 .procname = "temp_prefered_lft",
3458 .data = &ipv6_devconf.temp_prefered_lft,
3459 .maxlen = sizeof(int),
3460 .mode = 0644,
3461 .proc_handler = &proc_dointvec,
3462 },
3463 {
3464 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3465 .procname = "regen_max_retry",
3466 .data = &ipv6_devconf.regen_max_retry,
3467 .maxlen = sizeof(int),
3468 .mode = 0644,
3469 .proc_handler = &proc_dointvec,
3470 },
3471 {
3472 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3473 .procname = "max_desync_factor",
3474 .data = &ipv6_devconf.max_desync_factor,
3475 .maxlen = sizeof(int),
3476 .mode = 0644,
3477 .proc_handler = &proc_dointvec,
3478 },
3479 #endif
3480 {
3481 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3482 .procname = "max_addresses",
3483 .data = &ipv6_devconf.max_addresses,
3484 .maxlen = sizeof(int),
3485 .mode = 0644,
3486 .proc_handler = &proc_dointvec,
3487 },
3488 {
3489 .ctl_name = 0, /* sentinel */
3490 }
3491 },
3492 .addrconf_dev = {
3493 {
3494 .ctl_name = NET_PROTO_CONF_ALL,
3495 .procname = "all",
3496 .mode = 0555,
3497 .child = addrconf_sysctl.addrconf_vars,
3498 },
3499 {
3500 .ctl_name = 0, /* sentinel */
3501 }
3502 },
3503 .addrconf_conf_dir = {
3504 {
3505 .ctl_name = NET_IPV6_CONF,
3506 .procname = "conf",
3507 .mode = 0555,
3508 .child = addrconf_sysctl.addrconf_dev,
3509 },
3510 {
3511 .ctl_name = 0, /* sentinel */
3512 }
3513 },
3514 .addrconf_proto_dir = {
3515 {
3516 .ctl_name = NET_IPV6,
3517 .procname = "ipv6",
3518 .mode = 0555,
3519 .child = addrconf_sysctl.addrconf_conf_dir,
3520 },
3521 {
3522 .ctl_name = 0, /* sentinel */
3523 }
3524 },
3525 .addrconf_root_dir = {
3526 {
3527 .ctl_name = CTL_NET,
3528 .procname = "net",
3529 .mode = 0555,
3530 .child = addrconf_sysctl.addrconf_proto_dir,
3531 },
3532 {
3533 .ctl_name = 0, /* sentinel */
3534 }
3535 },
3536 };
3537
3538 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3539 {
3540 int i;
3541 struct net_device *dev = idev ? idev->dev : NULL;
3542 struct addrconf_sysctl_table *t;
3543 char *dev_name = NULL;
3544
3545 t = kmalloc(sizeof(*t), GFP_KERNEL);
3546 if (t == NULL)
3547 return;
3548 memcpy(t, &addrconf_sysctl, sizeof(*t));
3549 for (i=0; t->addrconf_vars[i].data; i++) {
3550 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3551 t->addrconf_vars[i].de = NULL;
3552 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3553 }
3554 if (dev) {
3555 dev_name = dev->name;
3556 t->addrconf_dev[0].ctl_name = dev->ifindex;
3557 } else {
3558 dev_name = "default";
3559 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3560 }
3561
3562 /*
3563 * Make a copy of dev_name, because '.procname' is regarded as const
3564 * by sysctl and we wouldn't want anyone to change it under our feet
3565 * (see SIOCSIFNAME).
3566 */
3567 dev_name = kstrdup(dev_name, GFP_KERNEL);
3568 if (!dev_name)
3569 goto free;
3570
3571 t->addrconf_dev[0].procname = dev_name;
3572
3573 t->addrconf_dev[0].child = t->addrconf_vars;
3574 t->addrconf_dev[0].de = NULL;
3575 t->addrconf_conf_dir[0].child = t->addrconf_dev;
3576 t->addrconf_conf_dir[0].de = NULL;
3577 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3578 t->addrconf_proto_dir[0].de = NULL;
3579 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3580 t->addrconf_root_dir[0].de = NULL;
3581
3582 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3583 if (t->sysctl_header == NULL)
3584 goto free_procname;
3585 else
3586 p->sysctl = t;
3587 return;
3588
3589 /* error path */
3590 free_procname:
3591 kfree(dev_name);
3592 free:
3593 kfree(t);
3594
3595 return;
3596 }
3597
3598 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3599 {
3600 if (p->sysctl) {
3601 struct addrconf_sysctl_table *t = p->sysctl;
3602 p->sysctl = NULL;
3603 unregister_sysctl_table(t->sysctl_header);
3604 kfree(t->addrconf_dev[0].procname);
3605 kfree(t);
3606 }
3607 }
3608
3609
3610 #endif
3611
3612 /*
3613 * Device notifier
3614 */
3615
3616 int register_inet6addr_notifier(struct notifier_block *nb)
3617 {
3618 return notifier_chain_register(&inet6addr_chain, nb);
3619 }
3620
3621 int unregister_inet6addr_notifier(struct notifier_block *nb)
3622 {
3623 return notifier_chain_unregister(&inet6addr_chain,nb);
3624 }
3625
3626 /*
3627 * Init / cleanup code
3628 */
3629
3630 int __init addrconf_init(void)
3631 {
3632 int err = 0;
3633
3634 /* The addrconf netdev notifier requires that loopback_dev
3635 * has it's ipv6 private information allocated and setup
3636 * before it can bring up and give link-local addresses
3637 * to other devices which are up.
3638 *
3639 * Unfortunately, loopback_dev is not necessarily the first
3640 * entry in the global dev_base list of net devices. In fact,
3641 * it is likely to be the very last entry on that list.
3642 * So this causes the notifier registry below to try and
3643 * give link-local addresses to all devices besides loopback_dev
3644 * first, then loopback_dev, which cases all the non-loopback_dev
3645 * devices to fail to get a link-local address.
3646 *
3647 * So, as a temporary fix, allocate the ipv6 structure for
3648 * loopback_dev first by hand.
3649 * Longer term, all of the dependencies ipv6 has upon the loopback
3650 * device and it being up should be removed.
3651 */
3652 rtnl_lock();
3653 if (!ipv6_add_dev(&loopback_dev))
3654 err = -ENOMEM;
3655 rtnl_unlock();
3656 if (err)
3657 return err;
3658
3659 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3660
3661 register_netdevice_notifier(&ipv6_dev_notf);
3662
3663 #ifdef CONFIG_IPV6_PRIVACY
3664 md5_tfm = crypto_alloc_tfm("md5", 0);
3665 if (unlikely(md5_tfm == NULL))
3666 printk(KERN_WARNING
3667 "failed to load transform for md5\n");
3668 #endif
3669
3670 addrconf_verify(0);
3671 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3672 #ifdef CONFIG_SYSCTL
3673 addrconf_sysctl.sysctl_header =
3674 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3675 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3676 #endif
3677
3678 return 0;
3679 }
3680
3681 void __exit addrconf_cleanup(void)
3682 {
3683 struct net_device *dev;
3684 struct inet6_dev *idev;
3685 struct inet6_ifaddr *ifa;
3686 int i;
3687
3688 unregister_netdevice_notifier(&ipv6_dev_notf);
3689
3690 rtnetlink_links[PF_INET6] = NULL;
3691 #ifdef CONFIG_SYSCTL
3692 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3693 addrconf_sysctl_unregister(&ipv6_devconf);
3694 #endif
3695
3696 rtnl_lock();
3697
3698 /*
3699 * clean dev list.
3700 */
3701
3702 for (dev=dev_base; dev; dev=dev->next) {
3703 if ((idev = __in6_dev_get(dev)) == NULL)
3704 continue;
3705 addrconf_ifdown(dev, 1);
3706 }
3707 addrconf_ifdown(&loopback_dev, 2);
3708
3709 /*
3710 * Check hash table.
3711 */
3712
3713 write_lock_bh(&addrconf_hash_lock);
3714 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3715 for (ifa=inet6_addr_lst[i]; ifa; ) {
3716 struct inet6_ifaddr *bifa;
3717
3718 bifa = ifa;
3719 ifa = ifa->lst_next;
3720 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3721 /* Do not free it; something is wrong.
3722 Now we can investigate it with debugger.
3723 */
3724 }
3725 }
3726 write_unlock_bh(&addrconf_hash_lock);
3727
3728 del_timer(&addr_chk_timer);
3729
3730 rtnl_unlock();
3731
3732 #ifdef CONFIG_IPV6_PRIVACY
3733 crypto_free_tfm(md5_tfm);
3734 md5_tfm = NULL;
3735 #endif
3736
3737 #ifdef CONFIG_PROC_FS
3738 proc_net_remove("if_inet6");
3739 #endif
3740 }
Linux 2.6 libata-dev (mirror)