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[IPV6]: ROUTE: Add accept_ra_defrtr sysctl.
[linux-2.6/verdex.git] / net / ipv6 / addrconf.c
blobfbcdcc6ba93b53f071b9a1a82588366d777f3207
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/capability.h>
62 #include <linux/delay.h>
63 #include <linux/notifier.h>
64 #include <linux/string.h>
65
66 #include <net/sock.h>
67 #include <net/snmp.h>
68
69 #include <net/ipv6.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
74 #include <net/tcp.h>
75 #include <net/ip.h>
76 #include <linux/if_tunnel.h>
77 #include <linux/rtnetlink.h>
78
79 #ifdef CONFIG_IPV6_PRIVACY
80 #include <linux/random.h>
81 #endif
82
83 #include <asm/uaccess.h>
84
85 #include <linux/proc_fs.h>
86 #include <linux/seq_file.h>
87
88 /* Set to 3 to get tracing... */
89 #define ACONF_DEBUG 2
90
91 #if ACONF_DEBUG >= 3
92 #define ADBG(x) printk x
93 #else
94 #define ADBG(x)
95 #endif
96
97 #define INFINITY_LIFE_TIME 0xFFFFFFFF
98 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
99
100 #ifdef CONFIG_SYSCTL
101 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
102 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
103 #endif
104
105 #ifdef CONFIG_IPV6_PRIVACY
106 static int __ipv6_regen_rndid(struct inet6_dev *idev);
107 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
108 static void ipv6_regen_rndid(unsigned long data);
109
110 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
111 #endif
112
113 static int ipv6_count_addresses(struct inet6_dev *idev);
114
115 /*
116 * Configured unicast address hash table
117 */
118 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
119 static DEFINE_RWLOCK(addrconf_hash_lock);
120
121 /* Protects inet6 devices */
122 DEFINE_RWLOCK(addrconf_lock);
123
124 static void addrconf_verify(unsigned long);
125
126 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
127 static DEFINE_SPINLOCK(addrconf_verify_lock);
128
129 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
130 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
131
132 static int addrconf_ifdown(struct net_device *dev, int how);
133
134 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
135 static void addrconf_dad_timer(unsigned long data);
136 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
137 static void addrconf_dad_run(struct inet6_dev *idev);
138 static void addrconf_rs_timer(unsigned long data);
139 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
140 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
141
142 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
143 struct prefix_info *pinfo);
144 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
145
146 static struct notifier_block *inet6addr_chain;
147
148 struct ipv6_devconf ipv6_devconf = {
149 .forwarding = 0,
150 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
151 .mtu6 = IPV6_MIN_MTU,
152 .accept_ra = 1,
153 .accept_redirects = 1,
154 .autoconf = 1,
155 .force_mld_version = 0,
156 .dad_transmits = 1,
157 .rtr_solicits = MAX_RTR_SOLICITATIONS,
158 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
159 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
160 #ifdef CONFIG_IPV6_PRIVACY
161 .use_tempaddr = 0,
162 .temp_valid_lft = TEMP_VALID_LIFETIME,
163 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
164 .regen_max_retry = REGEN_MAX_RETRY,
165 .max_desync_factor = MAX_DESYNC_FACTOR,
166 #endif
167 .max_addresses = IPV6_MAX_ADDRESSES,
168 .accept_ra_defrtr = 1,
169 };
170
171 static struct ipv6_devconf ipv6_devconf_dflt = {
172 .forwarding = 0,
173 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
174 .mtu6 = IPV6_MIN_MTU,
175 .accept_ra = 1,
176 .accept_redirects = 1,
177 .autoconf = 1,
178 .dad_transmits = 1,
179 .rtr_solicits = MAX_RTR_SOLICITATIONS,
180 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
181 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
182 #ifdef CONFIG_IPV6_PRIVACY
183 .use_tempaddr = 0,
184 .temp_valid_lft = TEMP_VALID_LIFETIME,
185 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
186 .regen_max_retry = REGEN_MAX_RETRY,
187 .max_desync_factor = MAX_DESYNC_FACTOR,
188 #endif
189 .max_addresses = IPV6_MAX_ADDRESSES,
190 .accept_ra_defrtr = 1,
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 init_timer(&ndev->regen_timer);
373 ndev->regen_timer.function = ipv6_regen_rndid;
374 ndev->regen_timer.data = (unsigned long) ndev;
375 if ((dev->flags&IFF_LOOPBACK) ||
376 dev->type == ARPHRD_TUNNEL ||
377 dev->type == ARPHRD_NONE ||
378 dev->type == ARPHRD_SIT) {
379 printk(KERN_INFO
380 "%s: Disabled Privacy Extensions\n",
381 dev->name);
382 ndev->cnf.use_tempaddr = -1;
383 } else {
384 in6_dev_hold(ndev);
385 ipv6_regen_rndid((unsigned long) ndev);
386 }
387 #endif
388
389 if (netif_carrier_ok(dev))
390 ndev->if_flags |= IF_READY;
391
392 write_lock_bh(&addrconf_lock);
393 dev->ip6_ptr = ndev;
394 write_unlock_bh(&addrconf_lock);
395
396 ipv6_mc_init_dev(ndev);
397 ndev->tstamp = jiffies;
398 #ifdef CONFIG_SYSCTL
399 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
400 NET_IPV6_NEIGH, "ipv6",
401 &ndisc_ifinfo_sysctl_change,
402 NULL);
403 addrconf_sysctl_register(ndev, &ndev->cnf);
404 #endif
405 }
406 return ndev;
407 }
408
409 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
410 {
411 struct inet6_dev *idev;
412
413 ASSERT_RTNL();
414
415 if ((idev = __in6_dev_get(dev)) == NULL) {
416 if ((idev = ipv6_add_dev(dev)) == NULL)
417 return NULL;
418 }
419
420 if (dev->flags&IFF_UP)
421 ipv6_mc_up(idev);
422 return idev;
423 }
424
425 #ifdef CONFIG_SYSCTL
426 static void dev_forward_change(struct inet6_dev *idev)
427 {
428 struct net_device *dev;
429 struct inet6_ifaddr *ifa;
430 struct in6_addr addr;
431
432 if (!idev)
433 return;
434 dev = idev->dev;
435 if (dev && (dev->flags & IFF_MULTICAST)) {
436 ipv6_addr_all_routers(&addr);
437
438 if (idev->cnf.forwarding)
439 ipv6_dev_mc_inc(dev, &addr);
440 else
441 ipv6_dev_mc_dec(dev, &addr);
442 }
443 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
444 if (idev->cnf.forwarding)
445 addrconf_join_anycast(ifa);
446 else
447 addrconf_leave_anycast(ifa);
448 }
449 }
450
451
452 static void addrconf_forward_change(void)
453 {
454 struct net_device *dev;
455 struct inet6_dev *idev;
456
457 read_lock(&dev_base_lock);
458 for (dev=dev_base; dev; dev=dev->next) {
459 read_lock(&addrconf_lock);
460 idev = __in6_dev_get(dev);
461 if (idev) {
462 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
463 idev->cnf.forwarding = ipv6_devconf.forwarding;
464 if (changed)
465 dev_forward_change(idev);
466 }
467 read_unlock(&addrconf_lock);
468 }
469 read_unlock(&dev_base_lock);
470 }
471 #endif
472
473 /* Nobody refers to this ifaddr, destroy it */
474
475 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
476 {
477 BUG_TRAP(ifp->if_next==NULL);
478 BUG_TRAP(ifp->lst_next==NULL);
479 #ifdef NET_REFCNT_DEBUG
480 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
481 #endif
482
483 in6_dev_put(ifp->idev);
484
485 if (del_timer(&ifp->timer))
486 printk("Timer is still running, when freeing ifa=%p\n", ifp);
487
488 if (!ifp->dead) {
489 printk("Freeing alive inet6 address %p\n", ifp);
490 return;
491 }
492 dst_release(&ifp->rt->u.dst);
493
494 kfree(ifp);
495 }
496
497 /* On success it returns ifp with increased reference count */
498
499 static struct inet6_ifaddr *
500 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
501 int scope, u32 flags)
502 {
503 struct inet6_ifaddr *ifa = NULL;
504 struct rt6_info *rt;
505 int hash;
506 int err = 0;
507
508 read_lock_bh(&addrconf_lock);
509 if (idev->dead) {
510 err = -ENODEV; /*XXX*/
511 goto out2;
512 }
513
514 write_lock(&addrconf_hash_lock);
515
516 /* Ignore adding duplicate addresses on an interface */
517 if (ipv6_chk_same_addr(addr, idev->dev)) {
518 ADBG(("ipv6_add_addr: already assigned\n"));
519 err = -EEXIST;
520 goto out;
521 }
522
523 ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
524
525 if (ifa == NULL) {
526 ADBG(("ipv6_add_addr: malloc failed\n"));
527 err = -ENOBUFS;
528 goto out;
529 }
530
531 rt = addrconf_dst_alloc(idev, addr, 0);
532 if (IS_ERR(rt)) {
533 err = PTR_ERR(rt);
534 goto out;
535 }
536
537 memset(ifa, 0, sizeof(struct inet6_ifaddr));
538 ipv6_addr_copy(&ifa->addr, addr);
539
540 spin_lock_init(&ifa->lock);
541 init_timer(&ifa->timer);
542 ifa->timer.data = (unsigned long) ifa;
543 ifa->scope = scope;
544 ifa->prefix_len = pfxlen;
545 ifa->flags = flags | IFA_F_TENTATIVE;
546 ifa->cstamp = ifa->tstamp = jiffies;
547
548 ifa->idev = idev;
549 in6_dev_hold(idev);
550 /* For caller */
551 in6_ifa_hold(ifa);
552
553 /* Add to big hash table */
554 hash = ipv6_addr_hash(addr);
555
556 ifa->lst_next = inet6_addr_lst[hash];
557 inet6_addr_lst[hash] = ifa;
558 in6_ifa_hold(ifa);
559 write_unlock(&addrconf_hash_lock);
560
561 write_lock(&idev->lock);
562 /* Add to inet6_dev unicast addr list. */
563 ifa->if_next = idev->addr_list;
564 idev->addr_list = ifa;
565
566 #ifdef CONFIG_IPV6_PRIVACY
567 if (ifa->flags&IFA_F_TEMPORARY) {
568 ifa->tmp_next = idev->tempaddr_list;
569 idev->tempaddr_list = ifa;
570 in6_ifa_hold(ifa);
571 }
572 #endif
573
574 ifa->rt = rt;
575
576 in6_ifa_hold(ifa);
577 write_unlock(&idev->lock);
578 out2:
579 read_unlock_bh(&addrconf_lock);
580
581 if (likely(err == 0))
582 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
583 else {
584 kfree(ifa);
585 ifa = ERR_PTR(err);
586 }
587
588 return ifa;
589 out:
590 write_unlock(&addrconf_hash_lock);
591 goto out2;
592 }
593
594 /* This function wants to get referenced ifp and releases it before return */
595
596 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
597 {
598 struct inet6_ifaddr *ifa, **ifap;
599 struct inet6_dev *idev = ifp->idev;
600 int hash;
601 int deleted = 0, onlink = 0;
602 unsigned long expires = jiffies;
603
604 hash = ipv6_addr_hash(&ifp->addr);
605
606 ifp->dead = 1;
607
608 write_lock_bh(&addrconf_hash_lock);
609 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
610 ifap = &ifa->lst_next) {
611 if (ifa == ifp) {
612 *ifap = ifa->lst_next;
613 __in6_ifa_put(ifp);
614 ifa->lst_next = NULL;
615 break;
616 }
617 }
618 write_unlock_bh(&addrconf_hash_lock);
619
620 write_lock_bh(&idev->lock);
621 #ifdef CONFIG_IPV6_PRIVACY
622 if (ifp->flags&IFA_F_TEMPORARY) {
623 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
624 ifap = &ifa->tmp_next) {
625 if (ifa == ifp) {
626 *ifap = ifa->tmp_next;
627 if (ifp->ifpub) {
628 in6_ifa_put(ifp->ifpub);
629 ifp->ifpub = NULL;
630 }
631 __in6_ifa_put(ifp);
632 ifa->tmp_next = NULL;
633 break;
634 }
635 }
636 }
637 #endif
638
639 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
640 if (ifa == ifp) {
641 *ifap = ifa->if_next;
642 __in6_ifa_put(ifp);
643 ifa->if_next = NULL;
644 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
645 break;
646 deleted = 1;
647 continue;
648 } else if (ifp->flags & IFA_F_PERMANENT) {
649 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
650 ifp->prefix_len)) {
651 if (ifa->flags & IFA_F_PERMANENT) {
652 onlink = 1;
653 if (deleted)
654 break;
655 } else {
656 unsigned long lifetime;
657
658 if (!onlink)
659 onlink = -1;
660
661 spin_lock(&ifa->lock);
662 lifetime = min_t(unsigned long,
663 ifa->valid_lft, 0x7fffffffUL/HZ);
664 if (time_before(expires,
665 ifa->tstamp + lifetime * HZ))
666 expires = ifa->tstamp + lifetime * HZ;
667 spin_unlock(&ifa->lock);
668 }
669 }
670 }
671 ifap = &ifa->if_next;
672 }
673 write_unlock_bh(&idev->lock);
674
675 ipv6_ifa_notify(RTM_DELADDR, ifp);
676
677 notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
678
679 addrconf_del_timer(ifp);
680
681 /*
682 * Purge or update corresponding prefix
683 *
684 * 1) we don't purge prefix here if address was not permanent.
685 * prefix is managed by its own lifetime.
686 * 2) if there're no addresses, delete prefix.
687 * 3) if there're still other permanent address(es),
688 * corresponding prefix is still permanent.
689 * 4) otherwise, update prefix lifetime to the
690 * longest valid lifetime among the corresponding
691 * addresses on the device.
692 * Note: subsequent RA will update lifetime.
693 *
694 * --yoshfuji
695 */
696 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
697 struct in6_addr prefix;
698 struct rt6_info *rt;
699
700 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
701 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
702
703 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
704 if (onlink == 0) {
705 ip6_del_rt(rt, NULL, NULL, NULL);
706 rt = NULL;
707 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
708 rt->rt6i_expires = expires;
709 rt->rt6i_flags |= RTF_EXPIRES;
710 }
711 }
712 dst_release(&rt->u.dst);
713 }
714
715 in6_ifa_put(ifp);
716 }
717
718 #ifdef CONFIG_IPV6_PRIVACY
719 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
720 {
721 struct inet6_dev *idev = ifp->idev;
722 struct in6_addr addr, *tmpaddr;
723 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
724 int tmp_plen;
725 int ret = 0;
726 int max_addresses;
727
728 write_lock(&idev->lock);
729 if (ift) {
730 spin_lock_bh(&ift->lock);
731 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
732 spin_unlock_bh(&ift->lock);
733 tmpaddr = &addr;
734 } else {
735 tmpaddr = NULL;
736 }
737 retry:
738 in6_dev_hold(idev);
739 if (idev->cnf.use_tempaddr <= 0) {
740 write_unlock(&idev->lock);
741 printk(KERN_INFO
742 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
743 in6_dev_put(idev);
744 ret = -1;
745 goto out;
746 }
747 spin_lock_bh(&ifp->lock);
748 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
749 idev->cnf.use_tempaddr = -1; /*XXX*/
750 spin_unlock_bh(&ifp->lock);
751 write_unlock(&idev->lock);
752 printk(KERN_WARNING
753 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
754 in6_dev_put(idev);
755 ret = -1;
756 goto out;
757 }
758 in6_ifa_hold(ifp);
759 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
760 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
761 spin_unlock_bh(&ifp->lock);
762 write_unlock(&idev->lock);
763 printk(KERN_WARNING
764 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
765 in6_ifa_put(ifp);
766 in6_dev_put(idev);
767 ret = -1;
768 goto out;
769 }
770 memcpy(&addr.s6_addr[8], idev->rndid, 8);
771 tmp_valid_lft = min_t(__u32,
772 ifp->valid_lft,
773 idev->cnf.temp_valid_lft);
774 tmp_prefered_lft = min_t(__u32,
775 ifp->prefered_lft,
776 idev->cnf.temp_prefered_lft - desync_factor / HZ);
777 tmp_plen = ifp->prefix_len;
778 max_addresses = idev->cnf.max_addresses;
779 tmp_cstamp = ifp->cstamp;
780 tmp_tstamp = ifp->tstamp;
781 spin_unlock_bh(&ifp->lock);
782
783 write_unlock(&idev->lock);
784 ift = !max_addresses ||
785 ipv6_count_addresses(idev) < max_addresses ?
786 ipv6_add_addr(idev, &addr, tmp_plen,
787 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
788 if (!ift || IS_ERR(ift)) {
789 in6_ifa_put(ifp);
790 in6_dev_put(idev);
791 printk(KERN_INFO
792 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
793 tmpaddr = &addr;
794 write_lock(&idev->lock);
795 goto retry;
796 }
797
798 spin_lock_bh(&ift->lock);
799 ift->ifpub = ifp;
800 ift->valid_lft = tmp_valid_lft;
801 ift->prefered_lft = tmp_prefered_lft;
802 ift->cstamp = tmp_cstamp;
803 ift->tstamp = tmp_tstamp;
804 spin_unlock_bh(&ift->lock);
805
806 addrconf_dad_start(ift, 0);
807 in6_ifa_put(ift);
808 in6_dev_put(idev);
809 out:
810 return ret;
811 }
812 #endif
813
814 /*
815 * Choose an appropriate source address (RFC3484)
816 */
817 struct ipv6_saddr_score {
818 int addr_type;
819 unsigned int attrs;
820 int matchlen;
821 int scope;
822 unsigned int rule;
823 };
824
825 #define IPV6_SADDR_SCORE_LOCAL 0x0001
826 #define IPV6_SADDR_SCORE_PREFERRED 0x0004
827 #define IPV6_SADDR_SCORE_HOA 0x0008
828 #define IPV6_SADDR_SCORE_OIF 0x0010
829 #define IPV6_SADDR_SCORE_LABEL 0x0020
830 #define IPV6_SADDR_SCORE_PRIVACY 0x0040
831
832 static int inline ipv6_saddr_preferred(int type)
833 {
834 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
835 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
836 return 1;
837 return 0;
838 }
839
840 /* static matching label */
841 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
842 {
843 /*
844 * prefix (longest match) label
845 * -----------------------------
846 * ::1/128 0
847 * ::/0 1
848 * 2002::/16 2
849 * ::/96 3
850 * ::ffff:0:0/96 4
851 */
852 if (type & IPV6_ADDR_LOOPBACK)
853 return 0;
854 else if (type & IPV6_ADDR_COMPATv4)
855 return 3;
856 else if (type & IPV6_ADDR_MAPPED)
857 return 4;
858 else if (addr->s6_addr16[0] == htons(0x2002))
859 return 2;
860 return 1;
861 }
862
863 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
864 struct in6_addr *daddr, struct in6_addr *saddr)
865 {
866 struct ipv6_saddr_score hiscore;
867 struct inet6_ifaddr *ifa_result = NULL;
868 int daddr_type = __ipv6_addr_type(daddr);
869 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
870 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
871 struct net_device *dev;
872
873 memset(&hiscore, 0, sizeof(hiscore));
874
875 read_lock(&dev_base_lock);
876 read_lock(&addrconf_lock);
877
878 for (dev = dev_base; dev; dev=dev->next) {
879 struct inet6_dev *idev;
880 struct inet6_ifaddr *ifa;
881
882 /* Rule 0: Candidate Source Address (section 4)
883 * - multicast and link-local destination address,
884 * the set of candidate source address MUST only
885 * include addresses assigned to interfaces
886 * belonging to the same link as the outgoing
887 * interface.
888 * (- For site-local destination addresses, the
889 * set of candidate source addresses MUST only
890 * include addresses assigned to interfaces
891 * belonging to the same site as the outgoing
892 * interface.)
893 */
894 if ((daddr_type & IPV6_ADDR_MULTICAST ||
895 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
896 daddr_dev && dev != daddr_dev)
897 continue;
898
899 idev = __in6_dev_get(dev);
900 if (!idev)
901 continue;
902
903 read_lock_bh(&idev->lock);
904 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
905 struct ipv6_saddr_score score;
906
907 score.addr_type = __ipv6_addr_type(&ifa->addr);
908
909 /* Rule 0:
910 * - Tentative Address (RFC2462 section 5.4)
911 * - A tentative address is not considered
912 * "assigned to an interface" in the traditional
913 * sense.
914 * - Candidate Source Address (section 4)
915 * - In any case, anycast addresses, multicast
916 * addresses, and the unspecified address MUST
917 * NOT be included in a candidate set.
918 */
919 if (ifa->flags & IFA_F_TENTATIVE)
920 continue;
921 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
922 score.addr_type & IPV6_ADDR_MULTICAST)) {
923 LIMIT_NETDEBUG(KERN_DEBUG
924 "ADDRCONF: unspecified / multicast address"
925 "assigned as unicast address on %s",
926 dev->name);
927 continue;
928 }
929
930 score.attrs = 0;
931 score.matchlen = 0;
932 score.scope = 0;
933 score.rule = 0;
934
935 if (ifa_result == NULL) {
936 /* record it if the first available entry */
937 goto record_it;
938 }
939
940 /* Rule 1: Prefer same address */
941 if (hiscore.rule < 1) {
942 if (ipv6_addr_equal(&ifa_result->addr, daddr))
943 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
944 hiscore.rule++;
945 }
946 if (ipv6_addr_equal(&ifa->addr, daddr)) {
947 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
948 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
949 score.rule = 1;
950 goto record_it;
951 }
952 } else {
953 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
954 continue;
955 }
956
957 /* Rule 2: Prefer appropriate scope */
958 if (hiscore.rule < 2) {
959 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
960 hiscore.rule++;
961 }
962 score.scope = __ipv6_addr_src_scope(score.addr_type);
963 if (hiscore.scope < score.scope) {
964 if (hiscore.scope < daddr_scope) {
965 score.rule = 2;
966 goto record_it;
967 } else
968 continue;
969 } else if (score.scope < hiscore.scope) {
970 if (score.scope < daddr_scope)
971 continue;
972 else {
973 score.rule = 2;
974 goto record_it;
975 }
976 }
977
978 /* Rule 3: Avoid deprecated address */
979 if (hiscore.rule < 3) {
980 if (ipv6_saddr_preferred(hiscore.addr_type) ||
981 !(ifa_result->flags & IFA_F_DEPRECATED))
982 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
983 hiscore.rule++;
984 }
985 if (ipv6_saddr_preferred(score.addr_type) ||
986 !(ifa->flags & IFA_F_DEPRECATED)) {
987 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
988 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
989 score.rule = 3;
990 goto record_it;
991 }
992 } else {
993 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
994 continue;
995 }
996
997 /* Rule 4: Prefer home address -- not implemented yet */
998 if (hiscore.rule < 4)
999 hiscore.rule++;
1000
1001 /* Rule 5: Prefer outgoing interface */
1002 if (hiscore.rule < 5) {
1003 if (daddr_dev == NULL ||
1004 daddr_dev == ifa_result->idev->dev)
1005 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1006 hiscore.rule++;
1007 }
1008 if (daddr_dev == NULL ||
1009 daddr_dev == ifa->idev->dev) {
1010 score.attrs |= IPV6_SADDR_SCORE_OIF;
1011 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1012 score.rule = 5;
1013 goto record_it;
1014 }
1015 } else {
1016 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1017 continue;
1018 }
1019
1020 /* Rule 6: Prefer matching label */
1021 if (hiscore.rule < 6) {
1022 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1023 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1024 hiscore.rule++;
1025 }
1026 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1027 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1028 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1029 score.rule = 6;
1030 goto record_it;
1031 }
1032 } else {
1033 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1034 continue;
1035 }
1036
1037 #ifdef CONFIG_IPV6_PRIVACY
1038 /* Rule 7: Prefer public address
1039 * Note: prefer temprary address if use_tempaddr >= 2
1040 */
1041 if (hiscore.rule < 7) {
1042 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1043 (ifa_result->idev->cnf.use_tempaddr >= 2))
1044 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1045 hiscore.rule++;
1046 }
1047 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1048 (ifa->idev->cnf.use_tempaddr >= 2)) {
1049 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1050 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1051 score.rule = 7;
1052 goto record_it;
1053 }
1054 } else {
1055 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1056 continue;
1057 }
1058 #endif
1059 /* Rule 8: Use longest matching prefix */
1060 if (hiscore.rule < 8) {
1061 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1062 hiscore.rule++;
1063 }
1064 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1065 if (score.matchlen > hiscore.matchlen) {
1066 score.rule = 8;
1067 goto record_it;
1068 }
1069 #if 0
1070 else if (score.matchlen < hiscore.matchlen)
1071 continue;
1072 #endif
1073
1074 /* Final Rule: choose first available one */
1075 continue;
1076 record_it:
1077 if (ifa_result)
1078 in6_ifa_put(ifa_result);
1079 in6_ifa_hold(ifa);
1080 ifa_result = ifa;
1081 hiscore = score;
1082 }
1083 read_unlock_bh(&idev->lock);
1084 }
1085 read_unlock(&addrconf_lock);
1086 read_unlock(&dev_base_lock);
1087
1088 if (!ifa_result)
1089 return -EADDRNOTAVAIL;
1090
1091 ipv6_addr_copy(saddr, &ifa_result->addr);
1092 in6_ifa_put(ifa_result);
1093 return 0;
1094 }
1095
1096
1097 int ipv6_get_saddr(struct dst_entry *dst,
1098 struct in6_addr *daddr, struct in6_addr *saddr)
1099 {
1100 return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1101 }
1102
1103
1104 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1105 {
1106 struct inet6_dev *idev;
1107 int err = -EADDRNOTAVAIL;
1108
1109 read_lock(&addrconf_lock);
1110 if ((idev = __in6_dev_get(dev)) != NULL) {
1111 struct inet6_ifaddr *ifp;
1112
1113 read_lock_bh(&idev->lock);
1114 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1115 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1116 ipv6_addr_copy(addr, &ifp->addr);
1117 err = 0;
1118 break;
1119 }
1120 }
1121 read_unlock_bh(&idev->lock);
1122 }
1123 read_unlock(&addrconf_lock);
1124 return err;
1125 }
1126
1127 static int ipv6_count_addresses(struct inet6_dev *idev)
1128 {
1129 int cnt = 0;
1130 struct inet6_ifaddr *ifp;
1131
1132 read_lock_bh(&idev->lock);
1133 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1134 cnt++;
1135 read_unlock_bh(&idev->lock);
1136 return cnt;
1137 }
1138
1139 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1140 {
1141 struct inet6_ifaddr * ifp;
1142 u8 hash = ipv6_addr_hash(addr);
1143
1144 read_lock_bh(&addrconf_hash_lock);
1145 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1146 if (ipv6_addr_equal(&ifp->addr, addr) &&
1147 !(ifp->flags&IFA_F_TENTATIVE)) {
1148 if (dev == NULL || ifp->idev->dev == dev ||
1149 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1150 break;
1151 }
1152 }
1153 read_unlock_bh(&addrconf_hash_lock);
1154 return ifp != NULL;
1155 }
1156
1157 static
1158 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1159 {
1160 struct inet6_ifaddr * ifp;
1161 u8 hash = ipv6_addr_hash(addr);
1162
1163 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1164 if (ipv6_addr_equal(&ifp->addr, addr)) {
1165 if (dev == NULL || ifp->idev->dev == dev)
1166 break;
1167 }
1168 }
1169 return ifp != NULL;
1170 }
1171
1172 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1173 {
1174 struct inet6_ifaddr * ifp;
1175 u8 hash = ipv6_addr_hash(addr);
1176
1177 read_lock_bh(&addrconf_hash_lock);
1178 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1179 if (ipv6_addr_equal(&ifp->addr, addr)) {
1180 if (dev == NULL || ifp->idev->dev == dev ||
1181 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1182 in6_ifa_hold(ifp);
1183 break;
1184 }
1185 }
1186 }
1187 read_unlock_bh(&addrconf_hash_lock);
1188
1189 return ifp;
1190 }
1191
1192 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1193 {
1194 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1195 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1196 u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1197 u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1198 int sk_ipv6only = ipv6_only_sock(sk);
1199 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1200 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1201 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1202
1203 if (!sk2_rcv_saddr && !sk_ipv6only)
1204 return 1;
1205
1206 if (addr_type2 == IPV6_ADDR_ANY &&
1207 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1208 return 1;
1209
1210 if (addr_type == IPV6_ADDR_ANY &&
1211 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1212 return 1;
1213
1214 if (sk2_rcv_saddr6 &&
1215 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1216 return 1;
1217
1218 if (addr_type == IPV6_ADDR_MAPPED &&
1219 !sk2_ipv6only &&
1220 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1221 return 1;
1222
1223 return 0;
1224 }
1225
1226 /* Gets referenced address, destroys ifaddr */
1227
1228 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1229 {
1230 if (ifp->flags&IFA_F_PERMANENT) {
1231 spin_lock_bh(&ifp->lock);
1232 addrconf_del_timer(ifp);
1233 ifp->flags |= IFA_F_TENTATIVE;
1234 spin_unlock_bh(&ifp->lock);
1235 in6_ifa_put(ifp);
1236 #ifdef CONFIG_IPV6_PRIVACY
1237 } else if (ifp->flags&IFA_F_TEMPORARY) {
1238 struct inet6_ifaddr *ifpub;
1239 spin_lock_bh(&ifp->lock);
1240 ifpub = ifp->ifpub;
1241 if (ifpub) {
1242 in6_ifa_hold(ifpub);
1243 spin_unlock_bh(&ifp->lock);
1244 ipv6_create_tempaddr(ifpub, ifp);
1245 in6_ifa_put(ifpub);
1246 } else {
1247 spin_unlock_bh(&ifp->lock);
1248 }
1249 ipv6_del_addr(ifp);
1250 #endif
1251 } else
1252 ipv6_del_addr(ifp);
1253 }
1254
1255 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1256 {
1257 if (net_ratelimit())
1258 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1259 addrconf_dad_stop(ifp);
1260 }
1261
1262 /* Join to solicited addr multicast group. */
1263
1264 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1265 {
1266 struct in6_addr maddr;
1267
1268 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1269 return;
1270
1271 addrconf_addr_solict_mult(addr, &maddr);
1272 ipv6_dev_mc_inc(dev, &maddr);
1273 }
1274
1275 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1276 {
1277 struct in6_addr maddr;
1278
1279 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1280 return;
1281
1282 addrconf_addr_solict_mult(addr, &maddr);
1283 __ipv6_dev_mc_dec(idev, &maddr);
1284 }
1285
1286 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1287 {
1288 struct in6_addr addr;
1289 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1290 if (ipv6_addr_any(&addr))
1291 return;
1292 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1293 }
1294
1295 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1296 {
1297 struct in6_addr addr;
1298 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1299 if (ipv6_addr_any(&addr))
1300 return;
1301 __ipv6_dev_ac_dec(ifp->idev, &addr);
1302 }
1303
1304 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1305 {
1306 if (dev->addr_len != ETH_ALEN)
1307 return -1;
1308 memcpy(eui, dev->dev_addr, 3);
1309 memcpy(eui + 5, dev->dev_addr + 3, 3);
1310
1311 /*
1312 * The zSeries OSA network cards can be shared among various
1313 * OS instances, but the OSA cards have only one MAC address.
1314 * This leads to duplicate address conflicts in conjunction
1315 * with IPv6 if more than one instance uses the same card.
1316 *
1317 * The driver for these cards can deliver a unique 16-bit
1318 * identifier for each instance sharing the same card. It is
1319 * placed instead of 0xFFFE in the interface identifier. The
1320 * "u" bit of the interface identifier is not inverted in this
1321 * case. Hence the resulting interface identifier has local
1322 * scope according to RFC2373.
1323 */
1324 if (dev->dev_id) {
1325 eui[3] = (dev->dev_id >> 8) & 0xFF;
1326 eui[4] = dev->dev_id & 0xFF;
1327 } else {
1328 eui[3] = 0xFF;
1329 eui[4] = 0xFE;
1330 eui[0] ^= 2;
1331 }
1332 return 0;
1333 }
1334
1335 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1336 {
1337 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1338 if (dev->addr_len != ARCNET_ALEN)
1339 return -1;
1340 memset(eui, 0, 7);
1341 eui[7] = *(u8*)dev->dev_addr;
1342 return 0;
1343 }
1344
1345 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1346 {
1347 if (dev->addr_len != INFINIBAND_ALEN)
1348 return -1;
1349 memcpy(eui, dev->dev_addr + 12, 8);
1350 eui[0] |= 2;
1351 return 0;
1352 }
1353
1354 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1355 {
1356 switch (dev->type) {
1357 case ARPHRD_ETHER:
1358 case ARPHRD_FDDI:
1359 case ARPHRD_IEEE802_TR:
1360 return addrconf_ifid_eui48(eui, dev);
1361 case ARPHRD_ARCNET:
1362 return addrconf_ifid_arcnet(eui, dev);
1363 case ARPHRD_INFINIBAND:
1364 return addrconf_ifid_infiniband(eui, dev);
1365 }
1366 return -1;
1367 }
1368
1369 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1370 {
1371 int err = -1;
1372 struct inet6_ifaddr *ifp;
1373
1374 read_lock_bh(&idev->lock);
1375 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1376 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1377 memcpy(eui, ifp->addr.s6_addr+8, 8);
1378 err = 0;
1379 break;
1380 }
1381 }
1382 read_unlock_bh(&idev->lock);
1383 return err;
1384 }
1385
1386 #ifdef CONFIG_IPV6_PRIVACY
1387 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1388 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1389 {
1390 regen:
1391 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1392 idev->rndid[0] &= ~0x02;
1393
1394 /*
1395 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1396 * check if generated address is not inappropriate
1397 *
1398 * - Reserved subnet anycast (RFC 2526)
1399 * 11111101 11....11 1xxxxxxx
1400 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1401 * 00-00-5E-FE-xx-xx-xx-xx
1402 * - value 0
1403 * - XXX: already assigned to an address on the device
1404 */
1405 if (idev->rndid[0] == 0xfd &&
1406 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1407 (idev->rndid[7]&0x80))
1408 goto regen;
1409 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1410 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1411 goto regen;
1412 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1413 goto regen;
1414 }
1415
1416 return 0;
1417 }
1418
1419 static void ipv6_regen_rndid(unsigned long data)
1420 {
1421 struct inet6_dev *idev = (struct inet6_dev *) data;
1422 unsigned long expires;
1423
1424 read_lock_bh(&addrconf_lock);
1425 write_lock_bh(&idev->lock);
1426
1427 if (idev->dead)
1428 goto out;
1429
1430 if (__ipv6_regen_rndid(idev) < 0)
1431 goto out;
1432
1433 expires = jiffies +
1434 idev->cnf.temp_prefered_lft * HZ -
1435 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1436 if (time_before(expires, jiffies)) {
1437 printk(KERN_WARNING
1438 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1439 idev->dev->name);
1440 goto out;
1441 }
1442
1443 if (!mod_timer(&idev->regen_timer, expires))
1444 in6_dev_hold(idev);
1445
1446 out:
1447 write_unlock_bh(&idev->lock);
1448 read_unlock_bh(&addrconf_lock);
1449 in6_dev_put(idev);
1450 }
1451
1452 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1453 int ret = 0;
1454
1455 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1456 ret = __ipv6_regen_rndid(idev);
1457 return ret;
1458 }
1459 #endif
1460
1461 /*
1462 * Add prefix route.
1463 */
1464
1465 static void
1466 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1467 unsigned long expires, u32 flags)
1468 {
1469 struct in6_rtmsg rtmsg;
1470
1471 memset(&rtmsg, 0, sizeof(rtmsg));
1472 ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1473 rtmsg.rtmsg_dst_len = plen;
1474 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1475 rtmsg.rtmsg_ifindex = dev->ifindex;
1476 rtmsg.rtmsg_info = expires;
1477 rtmsg.rtmsg_flags = RTF_UP|flags;
1478 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1479
1480 /* Prevent useless cloning on PtP SIT.
1481 This thing is done here expecting that the whole
1482 class of non-broadcast devices need not cloning.
1483 */
1484 if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1485 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1486
1487 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1488 }
1489
1490 /* Create "default" multicast route to the interface */
1491
1492 static void addrconf_add_mroute(struct net_device *dev)
1493 {
1494 struct in6_rtmsg rtmsg;
1495
1496 memset(&rtmsg, 0, sizeof(rtmsg));
1497 ipv6_addr_set(&rtmsg.rtmsg_dst,
1498 htonl(0xFF000000), 0, 0, 0);
1499 rtmsg.rtmsg_dst_len = 8;
1500 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1501 rtmsg.rtmsg_ifindex = dev->ifindex;
1502 rtmsg.rtmsg_flags = RTF_UP;
1503 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1504 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1505 }
1506
1507 static void sit_route_add(struct net_device *dev)
1508 {
1509 struct in6_rtmsg rtmsg;
1510
1511 memset(&rtmsg, 0, sizeof(rtmsg));
1512
1513 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1514 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1515
1516 /* prefix length - 96 bits "::d.d.d.d" */
1517 rtmsg.rtmsg_dst_len = 96;
1518 rtmsg.rtmsg_flags = RTF_UP|RTF_NONEXTHOP;
1519 rtmsg.rtmsg_ifindex = dev->ifindex;
1520
1521 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1522 }
1523
1524 static void addrconf_add_lroute(struct net_device *dev)
1525 {
1526 struct in6_addr addr;
1527
1528 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1529 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1530 }
1531
1532 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1533 {
1534 struct inet6_dev *idev;
1535
1536 ASSERT_RTNL();
1537
1538 if ((idev = ipv6_find_idev(dev)) == NULL)
1539 return NULL;
1540
1541 /* Add default multicast route */
1542 addrconf_add_mroute(dev);
1543
1544 /* Add link local route */
1545 addrconf_add_lroute(dev);
1546 return idev;
1547 }
1548
1549 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1550 {
1551 struct prefix_info *pinfo;
1552 __u32 valid_lft;
1553 __u32 prefered_lft;
1554 int addr_type;
1555 unsigned long rt_expires;
1556 struct inet6_dev *in6_dev;
1557
1558 pinfo = (struct prefix_info *) opt;
1559
1560 if (len < sizeof(struct prefix_info)) {
1561 ADBG(("addrconf: prefix option too short\n"));
1562 return;
1563 }
1564
1565 /*
1566 * Validation checks ([ADDRCONF], page 19)
1567 */
1568
1569 addr_type = ipv6_addr_type(&pinfo->prefix);
1570
1571 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1572 return;
1573
1574 valid_lft = ntohl(pinfo->valid);
1575 prefered_lft = ntohl(pinfo->prefered);
1576
1577 if (prefered_lft > valid_lft) {
1578 if (net_ratelimit())
1579 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1580 return;
1581 }
1582
1583 in6_dev = in6_dev_get(dev);
1584
1585 if (in6_dev == NULL) {
1586 if (net_ratelimit())
1587 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1588 return;
1589 }
1590
1591 /*
1592 * Two things going on here:
1593 * 1) Add routes for on-link prefixes
1594 * 2) Configure prefixes with the auto flag set
1595 */
1596
1597 /* Avoid arithmetic overflow. Really, we could
1598 save rt_expires in seconds, likely valid_lft,
1599 but it would require division in fib gc, that it
1600 not good.
1601 */
1602 if (valid_lft >= 0x7FFFFFFF/HZ)
1603 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1604 else
1605 rt_expires = valid_lft * HZ;
1606
1607 /*
1608 * We convert this (in jiffies) to clock_t later.
1609 * Avoid arithmetic overflow there as well.
1610 * Overflow can happen only if HZ < USER_HZ.
1611 */
1612 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1613 rt_expires = 0x7FFFFFFF / USER_HZ;
1614
1615 if (pinfo->onlink) {
1616 struct rt6_info *rt;
1617 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1618
1619 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1620 if (rt->rt6i_flags&RTF_EXPIRES) {
1621 if (valid_lft == 0) {
1622 ip6_del_rt(rt, NULL, NULL, NULL);
1623 rt = NULL;
1624 } else {
1625 rt->rt6i_expires = jiffies + rt_expires;
1626 }
1627 }
1628 } else if (valid_lft) {
1629 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1630 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1631 }
1632 if (rt)
1633 dst_release(&rt->u.dst);
1634 }
1635
1636 /* Try to figure out our local address for this prefix */
1637
1638 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1639 struct inet6_ifaddr * ifp;
1640 struct in6_addr addr;
1641 int create = 0, update_lft = 0;
1642
1643 if (pinfo->prefix_len == 64) {
1644 memcpy(&addr, &pinfo->prefix, 8);
1645 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1646 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1647 in6_dev_put(in6_dev);
1648 return;
1649 }
1650 goto ok;
1651 }
1652 if (net_ratelimit())
1653 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1654 pinfo->prefix_len);
1655 in6_dev_put(in6_dev);
1656 return;
1657
1658 ok:
1659
1660 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1661
1662 if (ifp == NULL && valid_lft) {
1663 int max_addresses = in6_dev->cnf.max_addresses;
1664
1665 /* Do not allow to create too much of autoconfigured
1666 * addresses; this would be too easy way to crash kernel.
1667 */
1668 if (!max_addresses ||
1669 ipv6_count_addresses(in6_dev) < max_addresses)
1670 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1671 addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1672
1673 if (!ifp || IS_ERR(ifp)) {
1674 in6_dev_put(in6_dev);
1675 return;
1676 }
1677
1678 update_lft = create = 1;
1679 ifp->cstamp = jiffies;
1680 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1681 }
1682
1683 if (ifp) {
1684 int flags;
1685 unsigned long now;
1686 #ifdef CONFIG_IPV6_PRIVACY
1687 struct inet6_ifaddr *ift;
1688 #endif
1689 u32 stored_lft;
1690
1691 /* update lifetime (RFC2462 5.5.3 e) */
1692 spin_lock(&ifp->lock);
1693 now = jiffies;
1694 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1695 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1696 else
1697 stored_lft = 0;
1698 if (!update_lft && stored_lft) {
1699 if (valid_lft > MIN_VALID_LIFETIME ||
1700 valid_lft > stored_lft)
1701 update_lft = 1;
1702 else if (stored_lft <= MIN_VALID_LIFETIME) {
1703 /* valid_lft <= stored_lft is always true */
1704 /* XXX: IPsec */
1705 update_lft = 0;
1706 } else {
1707 valid_lft = MIN_VALID_LIFETIME;
1708 if (valid_lft < prefered_lft)
1709 prefered_lft = valid_lft;
1710 update_lft = 1;
1711 }
1712 }
1713
1714 if (update_lft) {
1715 ifp->valid_lft = valid_lft;
1716 ifp->prefered_lft = prefered_lft;
1717 ifp->tstamp = now;
1718 flags = ifp->flags;
1719 ifp->flags &= ~IFA_F_DEPRECATED;
1720 spin_unlock(&ifp->lock);
1721
1722 if (!(flags&IFA_F_TENTATIVE))
1723 ipv6_ifa_notify(0, ifp);
1724 } else
1725 spin_unlock(&ifp->lock);
1726
1727 #ifdef CONFIG_IPV6_PRIVACY
1728 read_lock_bh(&in6_dev->lock);
1729 /* update all temporary addresses in the list */
1730 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1731 /*
1732 * When adjusting the lifetimes of an existing
1733 * temporary address, only lower the lifetimes.
1734 * Implementations must not increase the
1735 * lifetimes of an existing temporary address
1736 * when processing a Prefix Information Option.
1737 */
1738 spin_lock(&ift->lock);
1739 flags = ift->flags;
1740 if (ift->valid_lft > valid_lft &&
1741 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1742 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1743 if (ift->prefered_lft > prefered_lft &&
1744 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1745 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1746 spin_unlock(&ift->lock);
1747 if (!(flags&IFA_F_TENTATIVE))
1748 ipv6_ifa_notify(0, ift);
1749 }
1750
1751 if (create && in6_dev->cnf.use_tempaddr > 0) {
1752 /*
1753 * When a new public address is created as described in [ADDRCONF],
1754 * also create a new temporary address.
1755 */
1756 read_unlock_bh(&in6_dev->lock);
1757 ipv6_create_tempaddr(ifp, NULL);
1758 } else {
1759 read_unlock_bh(&in6_dev->lock);
1760 }
1761 #endif
1762 in6_ifa_put(ifp);
1763 addrconf_verify(0);
1764 }
1765 }
1766 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1767 in6_dev_put(in6_dev);
1768 }
1769
1770 /*
1771 * Set destination address.
1772 * Special case for SIT interfaces where we create a new "virtual"
1773 * device.
1774 */
1775 int addrconf_set_dstaddr(void __user *arg)
1776 {
1777 struct in6_ifreq ireq;
1778 struct net_device *dev;
1779 int err = -EINVAL;
1780
1781 rtnl_lock();
1782
1783 err = -EFAULT;
1784 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1785 goto err_exit;
1786
1787 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1788
1789 err = -ENODEV;
1790 if (dev == NULL)
1791 goto err_exit;
1792
1793 if (dev->type == ARPHRD_SIT) {
1794 struct ifreq ifr;
1795 mm_segment_t oldfs;
1796 struct ip_tunnel_parm p;
1797
1798 err = -EADDRNOTAVAIL;
1799 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1800 goto err_exit;
1801
1802 memset(&p, 0, sizeof(p));
1803 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1804 p.iph.saddr = 0;
1805 p.iph.version = 4;
1806 p.iph.ihl = 5;
1807 p.iph.protocol = IPPROTO_IPV6;
1808 p.iph.ttl = 64;
1809 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1810
1811 oldfs = get_fs(); set_fs(KERNEL_DS);
1812 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1813 set_fs(oldfs);
1814
1815 if (err == 0) {
1816 err = -ENOBUFS;
1817 if ((dev = __dev_get_by_name(p.name)) == NULL)
1818 goto err_exit;
1819 err = dev_open(dev);
1820 }
1821 }
1822
1823 err_exit:
1824 rtnl_unlock();
1825 return err;
1826 }
1827
1828 /*
1829 * Manual configuration of address on an interface
1830 */
1831 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1832 {
1833 struct inet6_ifaddr *ifp;
1834 struct inet6_dev *idev;
1835 struct net_device *dev;
1836 int scope;
1837
1838 ASSERT_RTNL();
1839
1840 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1841 return -ENODEV;
1842
1843 if (!(dev->flags&IFF_UP))
1844 return -ENETDOWN;
1845
1846 if ((idev = addrconf_add_dev(dev)) == NULL)
1847 return -ENOBUFS;
1848
1849 scope = ipv6_addr_scope(pfx);
1850
1851 ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1852 if (!IS_ERR(ifp)) {
1853 addrconf_dad_start(ifp, 0);
1854 in6_ifa_put(ifp);
1855 return 0;
1856 }
1857
1858 return PTR_ERR(ifp);
1859 }
1860
1861 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1862 {
1863 struct inet6_ifaddr *ifp;
1864 struct inet6_dev *idev;
1865 struct net_device *dev;
1866
1867 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1868 return -ENODEV;
1869
1870 if ((idev = __in6_dev_get(dev)) == NULL)
1871 return -ENXIO;
1872
1873 read_lock_bh(&idev->lock);
1874 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1875 if (ifp->prefix_len == plen &&
1876 ipv6_addr_equal(pfx, &ifp->addr)) {
1877 in6_ifa_hold(ifp);
1878 read_unlock_bh(&idev->lock);
1879
1880 ipv6_del_addr(ifp);
1881
1882 /* If the last address is deleted administratively,
1883 disable IPv6 on this interface.
1884 */
1885 if (idev->addr_list == NULL)
1886 addrconf_ifdown(idev->dev, 1);
1887 return 0;
1888 }
1889 }
1890 read_unlock_bh(&idev->lock);
1891 return -EADDRNOTAVAIL;
1892 }
1893
1894
1895 int addrconf_add_ifaddr(void __user *arg)
1896 {
1897 struct in6_ifreq ireq;
1898 int err;
1899
1900 if (!capable(CAP_NET_ADMIN))
1901 return -EPERM;
1902
1903 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1904 return -EFAULT;
1905
1906 rtnl_lock();
1907 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1908 rtnl_unlock();
1909 return err;
1910 }
1911
1912 int addrconf_del_ifaddr(void __user *arg)
1913 {
1914 struct in6_ifreq ireq;
1915 int err;
1916
1917 if (!capable(CAP_NET_ADMIN))
1918 return -EPERM;
1919
1920 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1921 return -EFAULT;
1922
1923 rtnl_lock();
1924 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1925 rtnl_unlock();
1926 return err;
1927 }
1928
1929 static void sit_add_v4_addrs(struct inet6_dev *idev)
1930 {
1931 struct inet6_ifaddr * ifp;
1932 struct in6_addr addr;
1933 struct net_device *dev;
1934 int scope;
1935
1936 ASSERT_RTNL();
1937
1938 memset(&addr, 0, sizeof(struct in6_addr));
1939 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1940
1941 if (idev->dev->flags&IFF_POINTOPOINT) {
1942 addr.s6_addr32[0] = htonl(0xfe800000);
1943 scope = IFA_LINK;
1944 } else {
1945 scope = IPV6_ADDR_COMPATv4;
1946 }
1947
1948 if (addr.s6_addr32[3]) {
1949 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1950 if (!IS_ERR(ifp)) {
1951 spin_lock_bh(&ifp->lock);
1952 ifp->flags &= ~IFA_F_TENTATIVE;
1953 spin_unlock_bh(&ifp->lock);
1954 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1955 in6_ifa_put(ifp);
1956 }
1957 return;
1958 }
1959
1960 for (dev = dev_base; dev != NULL; dev = dev->next) {
1961 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1962 if (in_dev && (dev->flags & IFF_UP)) {
1963 struct in_ifaddr * ifa;
1964
1965 int flag = scope;
1966
1967 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1968 int plen;
1969
1970 addr.s6_addr32[3] = ifa->ifa_local;
1971
1972 if (ifa->ifa_scope == RT_SCOPE_LINK)
1973 continue;
1974 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1975 if (idev->dev->flags&IFF_POINTOPOINT)
1976 continue;
1977 flag |= IFA_HOST;
1978 }
1979 if (idev->dev->flags&IFF_POINTOPOINT)
1980 plen = 64;
1981 else
1982 plen = 96;
1983
1984 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1985 IFA_F_PERMANENT);
1986 if (!IS_ERR(ifp)) {
1987 spin_lock_bh(&ifp->lock);
1988 ifp->flags &= ~IFA_F_TENTATIVE;
1989 spin_unlock_bh(&ifp->lock);
1990 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1991 in6_ifa_put(ifp);
1992 }
1993 }
1994 }
1995 }
1996 }
1997
1998 static void init_loopback(struct net_device *dev)
1999 {
2000 struct inet6_dev *idev;
2001 struct inet6_ifaddr * ifp;
2002
2003 /* ::1 */
2004
2005 ASSERT_RTNL();
2006
2007 if ((idev = ipv6_find_idev(dev)) == NULL) {
2008 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2009 return;
2010 }
2011
2012 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2013 if (!IS_ERR(ifp)) {
2014 spin_lock_bh(&ifp->lock);
2015 ifp->flags &= ~IFA_F_TENTATIVE;
2016 spin_unlock_bh(&ifp->lock);
2017 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2018 in6_ifa_put(ifp);
2019 }
2020 }
2021
2022 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2023 {
2024 struct inet6_ifaddr * ifp;
2025
2026 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2027 if (!IS_ERR(ifp)) {
2028 addrconf_dad_start(ifp, 0);
2029 in6_ifa_put(ifp);
2030 }
2031 }
2032
2033 static void addrconf_dev_config(struct net_device *dev)
2034 {
2035 struct in6_addr addr;
2036 struct inet6_dev * idev;
2037
2038 ASSERT_RTNL();
2039
2040 if ((dev->type != ARPHRD_ETHER) &&
2041 (dev->type != ARPHRD_FDDI) &&
2042 (dev->type != ARPHRD_IEEE802_TR) &&
2043 (dev->type != ARPHRD_ARCNET) &&
2044 (dev->type != ARPHRD_INFINIBAND)) {
2045 /* Alas, we support only Ethernet autoconfiguration. */
2046 return;
2047 }
2048
2049 idev = addrconf_add_dev(dev);
2050 if (idev == NULL)
2051 return;
2052
2053 memset(&addr, 0, sizeof(struct in6_addr));
2054 addr.s6_addr32[0] = htonl(0xFE800000);
2055
2056 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2057 addrconf_add_linklocal(idev, &addr);
2058 }
2059
2060 static void addrconf_sit_config(struct net_device *dev)
2061 {
2062 struct inet6_dev *idev;
2063
2064 ASSERT_RTNL();
2065
2066 /*
2067 * Configure the tunnel with one of our IPv4
2068 * addresses... we should configure all of
2069 * our v4 addrs in the tunnel
2070 */
2071
2072 if ((idev = ipv6_find_idev(dev)) == NULL) {
2073 printk(KERN_DEBUG "init sit: add_dev failed\n");
2074 return;
2075 }
2076
2077 sit_add_v4_addrs(idev);
2078
2079 if (dev->flags&IFF_POINTOPOINT) {
2080 addrconf_add_mroute(dev);
2081 addrconf_add_lroute(dev);
2082 } else
2083 sit_route_add(dev);
2084 }
2085
2086 static inline int
2087 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2088 {
2089 struct in6_addr lladdr;
2090
2091 if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2092 addrconf_add_linklocal(idev, &lladdr);
2093 return 0;
2094 }
2095 return -1;
2096 }
2097
2098 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2099 {
2100 struct net_device *link_dev;
2101
2102 /* first try to inherit the link-local address from the link device */
2103 if (idev->dev->iflink &&
2104 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2105 if (!ipv6_inherit_linklocal(idev, link_dev))
2106 return;
2107 }
2108 /* then try to inherit it from any device */
2109 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2110 if (!ipv6_inherit_linklocal(idev, link_dev))
2111 return;
2112 }
2113 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2114 }
2115
2116 /*
2117 * Autoconfigure tunnel with a link-local address so routing protocols,
2118 * DHCPv6, MLD etc. can be run over the virtual link
2119 */
2120
2121 static void addrconf_ip6_tnl_config(struct net_device *dev)
2122 {
2123 struct inet6_dev *idev;
2124
2125 ASSERT_RTNL();
2126
2127 if ((idev = addrconf_add_dev(dev)) == NULL) {
2128 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2129 return;
2130 }
2131 ip6_tnl_add_linklocal(idev);
2132 }
2133
2134 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2135 void * data)
2136 {
2137 struct net_device *dev = (struct net_device *) data;
2138 struct inet6_dev *idev = __in6_dev_get(dev);
2139 int run_pending = 0;
2140
2141 switch(event) {
2142 case NETDEV_UP:
2143 case NETDEV_CHANGE:
2144 if (event == NETDEV_UP) {
2145 if (!netif_carrier_ok(dev)) {
2146 /* device is not ready yet. */
2147 printk(KERN_INFO
2148 "ADDRCONF(NETDEV_UP): %s: "
2149 "link is not ready\n",
2150 dev->name);
2151 break;
2152 }
2153
2154 if (idev)
2155 idev->if_flags |= IF_READY;
2156 } else {
2157 if (!netif_carrier_ok(dev)) {
2158 /* device is still not ready. */
2159 break;
2160 }
2161
2162 if (idev) {
2163 if (idev->if_flags & IF_READY) {
2164 /* device is already configured. */
2165 break;
2166 }
2167 idev->if_flags |= IF_READY;
2168 }
2169
2170 printk(KERN_INFO
2171 "ADDRCONF(NETDEV_CHANGE): %s: "
2172 "link becomes ready\n",
2173 dev->name);
2174
2175 run_pending = 1;
2176 }
2177
2178 switch(dev->type) {
2179 case ARPHRD_SIT:
2180 addrconf_sit_config(dev);
2181 break;
2182 case ARPHRD_TUNNEL6:
2183 addrconf_ip6_tnl_config(dev);
2184 break;
2185 case ARPHRD_LOOPBACK:
2186 init_loopback(dev);
2187 break;
2188
2189 default:
2190 addrconf_dev_config(dev);
2191 break;
2192 };
2193 if (idev) {
2194 if (run_pending)
2195 addrconf_dad_run(idev);
2196
2197 /* If the MTU changed during the interface down, when the
2198 interface up, the changed MTU must be reflected in the
2199 idev as well as routers.
2200 */
2201 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2202 rt6_mtu_change(dev, dev->mtu);
2203 idev->cnf.mtu6 = dev->mtu;
2204 }
2205 idev->tstamp = jiffies;
2206 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2207 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2208 stop IPv6 on this interface.
2209 */
2210 if (dev->mtu < IPV6_MIN_MTU)
2211 addrconf_ifdown(dev, event != NETDEV_DOWN);
2212 }
2213 break;
2214
2215 case NETDEV_CHANGEMTU:
2216 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2217 rt6_mtu_change(dev, dev->mtu);
2218 idev->cnf.mtu6 = dev->mtu;
2219 break;
2220 }
2221
2222 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2223
2224 case NETDEV_DOWN:
2225 case NETDEV_UNREGISTER:
2226 /*
2227 * Remove all addresses from this interface.
2228 */
2229 addrconf_ifdown(dev, event != NETDEV_DOWN);
2230 break;
2231
2232 case NETDEV_CHANGENAME:
2233 #ifdef CONFIG_SYSCTL
2234 if (idev) {
2235 addrconf_sysctl_unregister(&idev->cnf);
2236 neigh_sysctl_unregister(idev->nd_parms);
2237 neigh_sysctl_register(dev, idev->nd_parms,
2238 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2239 &ndisc_ifinfo_sysctl_change,
2240 NULL);
2241 addrconf_sysctl_register(idev, &idev->cnf);
2242 }
2243 #endif
2244 break;
2245 };
2246
2247 return NOTIFY_OK;
2248 }
2249
2250 /*
2251 * addrconf module should be notified of a device going up
2252 */
2253 static struct notifier_block ipv6_dev_notf = {
2254 .notifier_call = addrconf_notify,
2255 .priority = 0
2256 };
2257
2258 static int addrconf_ifdown(struct net_device *dev, int how)
2259 {
2260 struct inet6_dev *idev;
2261 struct inet6_ifaddr *ifa, **bifa;
2262 int i;
2263
2264 ASSERT_RTNL();
2265
2266 if (dev == &loopback_dev && how == 1)
2267 how = 0;
2268
2269 rt6_ifdown(dev);
2270 neigh_ifdown(&nd_tbl, dev);
2271
2272 idev = __in6_dev_get(dev);
2273 if (idev == NULL)
2274 return -ENODEV;
2275
2276 /* Step 1: remove reference to ipv6 device from parent device.
2277 Do not dev_put!
2278 */
2279 if (how == 1) {
2280 write_lock_bh(&addrconf_lock);
2281 dev->ip6_ptr = NULL;
2282 idev->dead = 1;
2283 write_unlock_bh(&addrconf_lock);
2284
2285 /* Step 1.5: remove snmp6 entry */
2286 snmp6_unregister_dev(idev);
2287
2288 }
2289
2290 /* Step 2: clear hash table */
2291 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2292 bifa = &inet6_addr_lst[i];
2293
2294 write_lock_bh(&addrconf_hash_lock);
2295 while ((ifa = *bifa) != NULL) {
2296 if (ifa->idev == idev) {
2297 *bifa = ifa->lst_next;
2298 ifa->lst_next = NULL;
2299 addrconf_del_timer(ifa);
2300 in6_ifa_put(ifa);
2301 continue;
2302 }
2303 bifa = &ifa->lst_next;
2304 }
2305 write_unlock_bh(&addrconf_hash_lock);
2306 }
2307
2308 write_lock_bh(&idev->lock);
2309
2310 /* Step 3: clear flags for stateless addrconf */
2311 if (how != 1)
2312 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2313
2314 /* Step 4: clear address list */
2315 #ifdef CONFIG_IPV6_PRIVACY
2316 if (how == 1 && del_timer(&idev->regen_timer))
2317 in6_dev_put(idev);
2318
2319 /* clear tempaddr list */
2320 while ((ifa = idev->tempaddr_list) != NULL) {
2321 idev->tempaddr_list = ifa->tmp_next;
2322 ifa->tmp_next = NULL;
2323 ifa->dead = 1;
2324 write_unlock_bh(&idev->lock);
2325 spin_lock_bh(&ifa->lock);
2326
2327 if (ifa->ifpub) {
2328 in6_ifa_put(ifa->ifpub);
2329 ifa->ifpub = NULL;
2330 }
2331 spin_unlock_bh(&ifa->lock);
2332 in6_ifa_put(ifa);
2333 write_lock_bh(&idev->lock);
2334 }
2335 #endif
2336 while ((ifa = idev->addr_list) != NULL) {
2337 idev->addr_list = ifa->if_next;
2338 ifa->if_next = NULL;
2339 ifa->dead = 1;
2340 addrconf_del_timer(ifa);
2341 write_unlock_bh(&idev->lock);
2342
2343 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2344 in6_ifa_put(ifa);
2345
2346 write_lock_bh(&idev->lock);
2347 }
2348 write_unlock_bh(&idev->lock);
2349
2350 /* Step 5: Discard multicast list */
2351
2352 if (how == 1)
2353 ipv6_mc_destroy_dev(idev);
2354 else
2355 ipv6_mc_down(idev);
2356
2357 /* Step 5: netlink notification of this interface */
2358 idev->tstamp = jiffies;
2359 inet6_ifinfo_notify(RTM_DELLINK, idev);
2360
2361 /* Shot the device (if unregistered) */
2362
2363 if (how == 1) {
2364 #ifdef CONFIG_SYSCTL
2365 addrconf_sysctl_unregister(&idev->cnf);
2366 neigh_sysctl_unregister(idev->nd_parms);
2367 #endif
2368 neigh_parms_release(&nd_tbl, idev->nd_parms);
2369 neigh_ifdown(&nd_tbl, dev);
2370 in6_dev_put(idev);
2371 }
2372 return 0;
2373 }
2374
2375 static void addrconf_rs_timer(unsigned long data)
2376 {
2377 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2378
2379 if (ifp->idev->cnf.forwarding)
2380 goto out;
2381
2382 if (ifp->idev->if_flags & IF_RA_RCVD) {
2383 /*
2384 * Announcement received after solicitation
2385 * was sent
2386 */
2387 goto out;
2388 }
2389
2390 spin_lock(&ifp->lock);
2391 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2392 struct in6_addr all_routers;
2393
2394 /* The wait after the last probe can be shorter */
2395 addrconf_mod_timer(ifp, AC_RS,
2396 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2397 ifp->idev->cnf.rtr_solicit_delay :
2398 ifp->idev->cnf.rtr_solicit_interval);
2399 spin_unlock(&ifp->lock);
2400
2401 ipv6_addr_all_routers(&all_routers);
2402
2403 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2404 } else {
2405 spin_unlock(&ifp->lock);
2406 /*
2407 * Note: we do not support deprecated "all on-link"
2408 * assumption any longer.
2409 */
2410 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2411 ifp->idev->dev->name);
2412 }
2413
2414 out:
2415 in6_ifa_put(ifp);
2416 }
2417
2418 /*
2419 * Duplicate Address Detection
2420 */
2421 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2422 {
2423 unsigned long rand_num;
2424 struct inet6_dev *idev = ifp->idev;
2425
2426 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2427 ifp->probes = idev->cnf.dad_transmits;
2428 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2429 }
2430
2431 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2432 {
2433 struct inet6_dev *idev = ifp->idev;
2434 struct net_device *dev = idev->dev;
2435
2436 addrconf_join_solict(dev, &ifp->addr);
2437
2438 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2439 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2440 flags);
2441
2442 net_srandom(ifp->addr.s6_addr32[3]);
2443
2444 read_lock_bh(&idev->lock);
2445 if (ifp->dead)
2446 goto out;
2447 spin_lock_bh(&ifp->lock);
2448
2449 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2450 !(ifp->flags&IFA_F_TENTATIVE)) {
2451 ifp->flags &= ~IFA_F_TENTATIVE;
2452 spin_unlock_bh(&ifp->lock);
2453 read_unlock_bh(&idev->lock);
2454
2455 addrconf_dad_completed(ifp);
2456 return;
2457 }
2458
2459 if (!(idev->if_flags & IF_READY)) {
2460 spin_unlock_bh(&ifp->lock);
2461 read_unlock_bh(&idev->lock);
2462 /*
2463 * If the defice is not ready:
2464 * - keep it tentative if it is a permanent address.
2465 * - otherwise, kill it.
2466 */
2467 in6_ifa_hold(ifp);
2468 addrconf_dad_stop(ifp);
2469 return;
2470 }
2471 addrconf_dad_kick(ifp);
2472 spin_unlock_bh(&ifp->lock);
2473 out:
2474 read_unlock_bh(&idev->lock);
2475 }
2476
2477 static void addrconf_dad_timer(unsigned long data)
2478 {
2479 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2480 struct inet6_dev *idev = ifp->idev;
2481 struct in6_addr unspec;
2482 struct in6_addr mcaddr;
2483
2484 read_lock_bh(&idev->lock);
2485 if (idev->dead) {
2486 read_unlock_bh(&idev->lock);
2487 goto out;
2488 }
2489 spin_lock_bh(&ifp->lock);
2490 if (ifp->probes == 0) {
2491 /*
2492 * DAD was successful
2493 */
2494
2495 ifp->flags &= ~IFA_F_TENTATIVE;
2496 spin_unlock_bh(&ifp->lock);
2497 read_unlock_bh(&idev->lock);
2498
2499 addrconf_dad_completed(ifp);
2500
2501 goto out;
2502 }
2503
2504 ifp->probes--;
2505 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2506 spin_unlock_bh(&ifp->lock);
2507 read_unlock_bh(&idev->lock);
2508
2509 /* send a neighbour solicitation for our addr */
2510 memset(&unspec, 0, sizeof(unspec));
2511 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2512 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2513 out:
2514 in6_ifa_put(ifp);
2515 }
2516
2517 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2518 {
2519 struct net_device * dev = ifp->idev->dev;
2520
2521 /*
2522 * Configure the address for reception. Now it is valid.
2523 */
2524
2525 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2526
2527 /* If added prefix is link local and forwarding is off,
2528 start sending router solicitations.
2529 */
2530
2531 if (ifp->idev->cnf.forwarding == 0 &&
2532 ifp->idev->cnf.rtr_solicits > 0 &&
2533 (dev->flags&IFF_LOOPBACK) == 0 &&
2534 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2535 struct in6_addr all_routers;
2536
2537 ipv6_addr_all_routers(&all_routers);
2538
2539 /*
2540 * If a host as already performed a random delay
2541 * [...] as part of DAD [...] there is no need
2542 * to delay again before sending the first RS
2543 */
2544 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2545
2546 spin_lock_bh(&ifp->lock);
2547 ifp->probes = 1;
2548 ifp->idev->if_flags |= IF_RS_SENT;
2549 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2550 spin_unlock_bh(&ifp->lock);
2551 }
2552 }
2553
2554 static void addrconf_dad_run(struct inet6_dev *idev) {
2555 struct inet6_ifaddr *ifp;
2556
2557 read_lock_bh(&idev->lock);
2558 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2559 spin_lock_bh(&ifp->lock);
2560 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2561 spin_unlock_bh(&ifp->lock);
2562 continue;
2563 }
2564 spin_unlock_bh(&ifp->lock);
2565 addrconf_dad_kick(ifp);
2566 }
2567 read_unlock_bh(&idev->lock);
2568 }
2569
2570 #ifdef CONFIG_PROC_FS
2571 struct if6_iter_state {
2572 int bucket;
2573 };
2574
2575 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2576 {
2577 struct inet6_ifaddr *ifa = NULL;
2578 struct if6_iter_state *state = seq->private;
2579
2580 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2581 ifa = inet6_addr_lst[state->bucket];
2582 if (ifa)
2583 break;
2584 }
2585 return ifa;
2586 }
2587
2588 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2589 {
2590 struct if6_iter_state *state = seq->private;
2591
2592 ifa = ifa->lst_next;
2593 try_again:
2594 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2595 ifa = inet6_addr_lst[state->bucket];
2596 goto try_again;
2597 }
2598 return ifa;
2599 }
2600
2601 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2602 {
2603 struct inet6_ifaddr *ifa = if6_get_first(seq);
2604
2605 if (ifa)
2606 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2607 --pos;
2608 return pos ? NULL : ifa;
2609 }
2610
2611 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2612 {
2613 read_lock_bh(&addrconf_hash_lock);
2614 return if6_get_idx(seq, *pos);
2615 }
2616
2617 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2618 {
2619 struct inet6_ifaddr *ifa;
2620
2621 ifa = if6_get_next(seq, v);
2622 ++*pos;
2623 return ifa;
2624 }
2625
2626 static void if6_seq_stop(struct seq_file *seq, void *v)
2627 {
2628 read_unlock_bh(&addrconf_hash_lock);
2629 }
2630
2631 static int if6_seq_show(struct seq_file *seq, void *v)
2632 {
2633 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2634 seq_printf(seq,
2635 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2636 NIP6(ifp->addr),
2637 ifp->idev->dev->ifindex,
2638 ifp->prefix_len,
2639 ifp->scope,
2640 ifp->flags,
2641 ifp->idev->dev->name);
2642 return 0;
2643 }
2644
2645 static struct seq_operations if6_seq_ops = {
2646 .start = if6_seq_start,
2647 .next = if6_seq_next,
2648 .show = if6_seq_show,
2649 .stop = if6_seq_stop,
2650 };
2651
2652 static int if6_seq_open(struct inode *inode, struct file *file)
2653 {
2654 struct seq_file *seq;
2655 int rc = -ENOMEM;
2656 struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2657
2658 if (!s)
2659 goto out;
2660 memset(s, 0, sizeof(*s));
2661
2662 rc = seq_open(file, &if6_seq_ops);
2663 if (rc)
2664 goto out_kfree;
2665
2666 seq = file->private_data;
2667 seq->private = s;
2668 out:
2669 return rc;
2670 out_kfree:
2671 kfree(s);
2672 goto out;
2673 }
2674
2675 static struct file_operations if6_fops = {
2676 .owner = THIS_MODULE,
2677 .open = if6_seq_open,
2678 .read = seq_read,
2679 .llseek = seq_lseek,
2680 .release = seq_release_private,
2681 };
2682
2683 int __init if6_proc_init(void)
2684 {
2685 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2686 return -ENOMEM;
2687 return 0;
2688 }
2689
2690 void if6_proc_exit(void)
2691 {
2692 proc_net_remove("if_inet6");
2693 }
2694 #endif /* CONFIG_PROC_FS */
2695
2696 /*
2697 * Periodic address status verification
2698 */
2699
2700 static void addrconf_verify(unsigned long foo)
2701 {
2702 struct inet6_ifaddr *ifp;
2703 unsigned long now, next;
2704 int i;
2705
2706 spin_lock_bh(&addrconf_verify_lock);
2707 now = jiffies;
2708 next = now + ADDR_CHECK_FREQUENCY;
2709
2710 del_timer(&addr_chk_timer);
2711
2712 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2713
2714 restart:
2715 read_lock(&addrconf_hash_lock);
2716 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2717 unsigned long age;
2718 #ifdef CONFIG_IPV6_PRIVACY
2719 unsigned long regen_advance;
2720 #endif
2721
2722 if (ifp->flags & IFA_F_PERMANENT)
2723 continue;
2724
2725 spin_lock(&ifp->lock);
2726 age = (now - ifp->tstamp) / HZ;
2727
2728 #ifdef CONFIG_IPV6_PRIVACY
2729 regen_advance = ifp->idev->cnf.regen_max_retry *
2730 ifp->idev->cnf.dad_transmits *
2731 ifp->idev->nd_parms->retrans_time / HZ;
2732 #endif
2733
2734 if (age >= ifp->valid_lft) {
2735 spin_unlock(&ifp->lock);
2736 in6_ifa_hold(ifp);
2737 read_unlock(&addrconf_hash_lock);
2738 ipv6_del_addr(ifp);
2739 goto restart;
2740 } else if (age >= ifp->prefered_lft) {
2741 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2742 int deprecate = 0;
2743
2744 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2745 deprecate = 1;
2746 ifp->flags |= IFA_F_DEPRECATED;
2747 }
2748
2749 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2750 next = ifp->tstamp + ifp->valid_lft * HZ;
2751
2752 spin_unlock(&ifp->lock);
2753
2754 if (deprecate) {
2755 in6_ifa_hold(ifp);
2756 read_unlock(&addrconf_hash_lock);
2757
2758 ipv6_ifa_notify(0, ifp);
2759 in6_ifa_put(ifp);
2760 goto restart;
2761 }
2762 #ifdef CONFIG_IPV6_PRIVACY
2763 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2764 !(ifp->flags&IFA_F_TENTATIVE)) {
2765 if (age >= ifp->prefered_lft - regen_advance) {
2766 struct inet6_ifaddr *ifpub = ifp->ifpub;
2767 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2768 next = ifp->tstamp + ifp->prefered_lft * HZ;
2769 if (!ifp->regen_count && ifpub) {
2770 ifp->regen_count++;
2771 in6_ifa_hold(ifp);
2772 in6_ifa_hold(ifpub);
2773 spin_unlock(&ifp->lock);
2774 read_unlock(&addrconf_hash_lock);
2775 spin_lock(&ifpub->lock);
2776 ifpub->regen_count = 0;
2777 spin_unlock(&ifpub->lock);
2778 ipv6_create_tempaddr(ifpub, ifp);
2779 in6_ifa_put(ifpub);
2780 in6_ifa_put(ifp);
2781 goto restart;
2782 }
2783 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2784 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2785 spin_unlock(&ifp->lock);
2786 #endif
2787 } else {
2788 /* ifp->prefered_lft <= ifp->valid_lft */
2789 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2790 next = ifp->tstamp + ifp->prefered_lft * HZ;
2791 spin_unlock(&ifp->lock);
2792 }
2793 }
2794 read_unlock(&addrconf_hash_lock);
2795 }
2796
2797 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2798 add_timer(&addr_chk_timer);
2799 spin_unlock_bh(&addrconf_verify_lock);
2800 }
2801
2802 static int
2803 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2804 {
2805 struct rtattr **rta = arg;
2806 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2807 struct in6_addr *pfx;
2808
2809 pfx = NULL;
2810 if (rta[IFA_ADDRESS-1]) {
2811 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2812 return -EINVAL;
2813 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2814 }
2815 if (rta[IFA_LOCAL-1]) {
2816 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2817 return -EINVAL;
2818 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2819 }
2820 if (pfx == NULL)
2821 return -EINVAL;
2822
2823 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2824 }
2825
2826 static int
2827 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2828 {
2829 struct rtattr **rta = arg;
2830 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2831 struct in6_addr *pfx;
2832
2833 pfx = NULL;
2834 if (rta[IFA_ADDRESS-1]) {
2835 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2836 return -EINVAL;
2837 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2838 }
2839 if (rta[IFA_LOCAL-1]) {
2840 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2841 return -EINVAL;
2842 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2843 }
2844 if (pfx == NULL)
2845 return -EINVAL;
2846
2847 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2848 }
2849
2850 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2851 u32 pid, u32 seq, int event, unsigned int flags)
2852 {
2853 struct ifaddrmsg *ifm;
2854 struct nlmsghdr *nlh;
2855 struct ifa_cacheinfo ci;
2856 unsigned char *b = skb->tail;
2857
2858 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2859 ifm = NLMSG_DATA(nlh);
2860 ifm->ifa_family = AF_INET6;
2861 ifm->ifa_prefixlen = ifa->prefix_len;
2862 ifm->ifa_flags = ifa->flags;
2863 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2864 if (ifa->scope&IFA_HOST)
2865 ifm->ifa_scope = RT_SCOPE_HOST;
2866 else if (ifa->scope&IFA_LINK)
2867 ifm->ifa_scope = RT_SCOPE_LINK;
2868 else if (ifa->scope&IFA_SITE)
2869 ifm->ifa_scope = RT_SCOPE_SITE;
2870 ifm->ifa_index = ifa->idev->dev->ifindex;
2871 RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2872 if (!(ifa->flags&IFA_F_PERMANENT)) {
2873 ci.ifa_prefered = ifa->prefered_lft;
2874 ci.ifa_valid = ifa->valid_lft;
2875 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2876 long tval = (jiffies - ifa->tstamp)/HZ;
2877 ci.ifa_prefered -= tval;
2878 if (ci.ifa_valid != INFINITY_LIFE_TIME)
2879 ci.ifa_valid -= tval;
2880 }
2881 } else {
2882 ci.ifa_prefered = INFINITY_LIFE_TIME;
2883 ci.ifa_valid = INFINITY_LIFE_TIME;
2884 }
2885 ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2886 + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2887 ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2888 + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2889 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2890 nlh->nlmsg_len = skb->tail - b;
2891 return skb->len;
2892
2893 nlmsg_failure:
2894 rtattr_failure:
2895 skb_trim(skb, b - skb->data);
2896 return -1;
2897 }
2898
2899 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2900 u32 pid, u32 seq, int event, u16 flags)
2901 {
2902 struct ifaddrmsg *ifm;
2903 struct nlmsghdr *nlh;
2904 struct ifa_cacheinfo ci;
2905 unsigned char *b = skb->tail;
2906
2907 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2908 ifm = NLMSG_DATA(nlh);
2909 ifm->ifa_family = AF_INET6;
2910 ifm->ifa_prefixlen = 128;
2911 ifm->ifa_flags = IFA_F_PERMANENT;
2912 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2913 if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2914 ifm->ifa_scope = RT_SCOPE_SITE;
2915 ifm->ifa_index = ifmca->idev->dev->ifindex;
2916 RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2917 ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2918 * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2919 * 100 / HZ);
2920 ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2921 * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2922 * 100 / HZ);
2923 ci.ifa_prefered = INFINITY_LIFE_TIME;
2924 ci.ifa_valid = INFINITY_LIFE_TIME;
2925 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2926 nlh->nlmsg_len = skb->tail - b;
2927 return skb->len;
2928
2929 nlmsg_failure:
2930 rtattr_failure:
2931 skb_trim(skb, b - skb->data);
2932 return -1;
2933 }
2934
2935 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2936 u32 pid, u32 seq, int event, unsigned int flags)
2937 {
2938 struct ifaddrmsg *ifm;
2939 struct nlmsghdr *nlh;
2940 struct ifa_cacheinfo ci;
2941 unsigned char *b = skb->tail;
2942
2943 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2944 ifm = NLMSG_DATA(nlh);
2945 ifm->ifa_family = AF_INET6;
2946 ifm->ifa_prefixlen = 128;
2947 ifm->ifa_flags = IFA_F_PERMANENT;
2948 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2949 if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2950 ifm->ifa_scope = RT_SCOPE_SITE;
2951 ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2952 RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2953 ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2954 * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2955 * 100 / HZ);
2956 ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2957 * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2958 * 100 / HZ);
2959 ci.ifa_prefered = INFINITY_LIFE_TIME;
2960 ci.ifa_valid = INFINITY_LIFE_TIME;
2961 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2962 nlh->nlmsg_len = skb->tail - b;
2963 return skb->len;
2964
2965 nlmsg_failure:
2966 rtattr_failure:
2967 skb_trim(skb, b - skb->data);
2968 return -1;
2969 }
2970
2971 enum addr_type_t
2972 {
2973 UNICAST_ADDR,
2974 MULTICAST_ADDR,
2975 ANYCAST_ADDR,
2976 };
2977
2978 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2979 enum addr_type_t type)
2980 {
2981 int idx, ip_idx;
2982 int s_idx, s_ip_idx;
2983 int err = 1;
2984 struct net_device *dev;
2985 struct inet6_dev *idev = NULL;
2986 struct inet6_ifaddr *ifa;
2987 struct ifmcaddr6 *ifmca;
2988 struct ifacaddr6 *ifaca;
2989
2990 s_idx = cb->args[0];
2991 s_ip_idx = ip_idx = cb->args[1];
2992 read_lock(&dev_base_lock);
2993
2994 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
2995 if (idx < s_idx)
2996 continue;
2997 if (idx > s_idx)
2998 s_ip_idx = 0;
2999 ip_idx = 0;
3000 if ((idev = in6_dev_get(dev)) == NULL)
3001 continue;
3002 read_lock_bh(&idev->lock);
3003 switch (type) {
3004 case UNICAST_ADDR:
3005 /* unicast address incl. temp addr */
3006 for (ifa = idev->addr_list; ifa;
3007 ifa = ifa->if_next, ip_idx++) {
3008 if (ip_idx < s_ip_idx)
3009 continue;
3010 if ((err = inet6_fill_ifaddr(skb, ifa,
3011 NETLINK_CB(cb->skb).pid,
3012 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3013 NLM_F_MULTI)) <= 0)
3014 goto done;
3015 }
3016 break;
3017 case MULTICAST_ADDR:
3018 /* multicast address */
3019 for (ifmca = idev->mc_list; ifmca;
3020 ifmca = ifmca->next, ip_idx++) {
3021 if (ip_idx < s_ip_idx)
3022 continue;
3023 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3024 NETLINK_CB(cb->skb).pid,
3025 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3026 NLM_F_MULTI)) <= 0)
3027 goto done;
3028 }
3029 break;
3030 case ANYCAST_ADDR:
3031 /* anycast address */
3032 for (ifaca = idev->ac_list; ifaca;
3033 ifaca = ifaca->aca_next, ip_idx++) {
3034 if (ip_idx < s_ip_idx)
3035 continue;
3036 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3037 NETLINK_CB(cb->skb).pid,
3038 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3039 NLM_F_MULTI)) <= 0)
3040 goto done;
3041 }
3042 break;
3043 default:
3044 break;
3045 }
3046 read_unlock_bh(&idev->lock);
3047 in6_dev_put(idev);
3048 }
3049 done:
3050 if (err <= 0) {
3051 read_unlock_bh(&idev->lock);
3052 in6_dev_put(idev);
3053 }
3054 read_unlock(&dev_base_lock);
3055 cb->args[0] = idx;
3056 cb->args[1] = ip_idx;
3057 return skb->len;
3058 }
3059
3060 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3061 {
3062 enum addr_type_t type = UNICAST_ADDR;
3063 return inet6_dump_addr(skb, cb, type);
3064 }
3065
3066 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3067 {
3068 enum addr_type_t type = MULTICAST_ADDR;
3069 return inet6_dump_addr(skb, cb, type);
3070 }
3071
3072
3073 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3074 {
3075 enum addr_type_t type = ANYCAST_ADDR;
3076 return inet6_dump_addr(skb, cb, type);
3077 }
3078
3079 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3080 {
3081 struct sk_buff *skb;
3082 int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
3083
3084 skb = alloc_skb(size, GFP_ATOMIC);
3085 if (!skb) {
3086 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
3087 return;
3088 }
3089 if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
3090 kfree_skb(skb);
3091 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
3092 return;
3093 }
3094 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3095 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
3096 }
3097
3098 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3099 __s32 *array, int bytes)
3100 {
3101 memset(array, 0, bytes);
3102 array[DEVCONF_FORWARDING] = cnf->forwarding;
3103 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3104 array[DEVCONF_MTU6] = cnf->mtu6;
3105 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3106 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3107 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3108 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3109 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3110 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3111 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3112 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3113 #ifdef CONFIG_IPV6_PRIVACY
3114 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3115 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3116 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3117 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3118 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3119 #endif
3120 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3121 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3122 }
3123
3124 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3125 u32 pid, u32 seq, int event, unsigned int flags)
3126 {
3127 struct net_device *dev = idev->dev;
3128 __s32 *array = NULL;
3129 struct ifinfomsg *r;
3130 struct nlmsghdr *nlh;
3131 unsigned char *b = skb->tail;
3132 struct rtattr *subattr;
3133 __u32 mtu = dev->mtu;
3134 struct ifla_cacheinfo ci;
3135
3136 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3137 r = NLMSG_DATA(nlh);
3138 r->ifi_family = AF_INET6;
3139 r->__ifi_pad = 0;
3140 r->ifi_type = dev->type;
3141 r->ifi_index = dev->ifindex;
3142 r->ifi_flags = dev_get_flags(dev);
3143 r->ifi_change = 0;
3144
3145 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3146
3147 if (dev->addr_len)
3148 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3149
3150 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3151 if (dev->ifindex != dev->iflink)
3152 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3153
3154 subattr = (struct rtattr*)skb->tail;
3155
3156 RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3157
3158 /* return the device flags */
3159 RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3160
3161 /* return interface cacheinfo */
3162 ci.max_reasm_len = IPV6_MAXPLEN;
3163 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3164 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3165 ci.reachable_time = idev->nd_parms->reachable_time;
3166 ci.retrans_time = idev->nd_parms->retrans_time;
3167 RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3168
3169 /* return the device sysctl params */
3170 if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3171 goto rtattr_failure;
3172 ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3173 RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3174
3175 /* XXX - Statistics/MC not implemented */
3176 subattr->rta_len = skb->tail - (u8*)subattr;
3177
3178 nlh->nlmsg_len = skb->tail - b;
3179 kfree(array);
3180 return skb->len;
3181
3182 nlmsg_failure:
3183 rtattr_failure:
3184 kfree(array);
3185 skb_trim(skb, b - skb->data);
3186 return -1;
3187 }
3188
3189 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3190 {
3191 int idx, err;
3192 int s_idx = cb->args[0];
3193 struct net_device *dev;
3194 struct inet6_dev *idev;
3195
3196 read_lock(&dev_base_lock);
3197 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3198 if (idx < s_idx)
3199 continue;
3200 if ((idev = in6_dev_get(dev)) == NULL)
3201 continue;
3202 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3203 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3204 in6_dev_put(idev);
3205 if (err <= 0)
3206 break;
3207 }
3208 read_unlock(&dev_base_lock);
3209 cb->args[0] = idx;
3210
3211 return skb->len;
3212 }
3213
3214 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3215 {
3216 struct sk_buff *skb;
3217 /* 128 bytes ?? */
3218 int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
3219
3220 skb = alloc_skb(size, GFP_ATOMIC);
3221 if (!skb) {
3222 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
3223 return;
3224 }
3225 if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3226 kfree_skb(skb);
3227 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3228 return;
3229 }
3230 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3231 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3232 }
3233
3234 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3235 struct prefix_info *pinfo, u32 pid, u32 seq,
3236 int event, unsigned int flags)
3237 {
3238 struct prefixmsg *pmsg;
3239 struct nlmsghdr *nlh;
3240 unsigned char *b = skb->tail;
3241 struct prefix_cacheinfo ci;
3242
3243 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3244 pmsg = NLMSG_DATA(nlh);
3245 pmsg->prefix_family = AF_INET6;
3246 pmsg->prefix_pad1 = 0;
3247 pmsg->prefix_pad2 = 0;
3248 pmsg->prefix_ifindex = idev->dev->ifindex;
3249 pmsg->prefix_len = pinfo->prefix_len;
3250 pmsg->prefix_type = pinfo->type;
3251 pmsg->prefix_pad3 = 0;
3252
3253 pmsg->prefix_flags = 0;
3254 if (pinfo->onlink)
3255 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3256 if (pinfo->autoconf)
3257 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3258
3259 RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3260
3261 ci.preferred_time = ntohl(pinfo->prefered);
3262 ci.valid_time = ntohl(pinfo->valid);
3263 RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3264
3265 nlh->nlmsg_len = skb->tail - b;
3266 return skb->len;
3267
3268 nlmsg_failure:
3269 rtattr_failure:
3270 skb_trim(skb, b - skb->data);
3271 return -1;
3272 }
3273
3274 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3275 struct prefix_info *pinfo)
3276 {
3277 struct sk_buff *skb;
3278 int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3279
3280 skb = alloc_skb(size, GFP_ATOMIC);
3281 if (!skb) {
3282 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3283 return;
3284 }
3285 if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3286 kfree_skb(skb);
3287 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3288 return;
3289 }
3290 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3291 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3292 }
3293
3294 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3295 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, },
3296 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, },
3297 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, },
3298 [RTM_GETADDR - RTM_BASE] = { .dumpit = inet6_dump_ifaddr, },
3299 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3300 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3301 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, },
3302 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, },
3303 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute,
3304 .dumpit = inet6_dump_fib, },
3305 };
3306
3307 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3308 {
3309 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3310
3311 switch (event) {
3312 case RTM_NEWADDR:
3313 ip6_ins_rt(ifp->rt, NULL, NULL, NULL);
3314 if (ifp->idev->cnf.forwarding)
3315 addrconf_join_anycast(ifp);
3316 break;
3317 case RTM_DELADDR:
3318 if (ifp->idev->cnf.forwarding)
3319 addrconf_leave_anycast(ifp);
3320 addrconf_leave_solict(ifp->idev, &ifp->addr);
3321 dst_hold(&ifp->rt->u.dst);
3322 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3323 dst_free(&ifp->rt->u.dst);
3324 break;
3325 }
3326 }
3327
3328 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3329 {
3330 read_lock_bh(&addrconf_lock);
3331 if (likely(ifp->idev->dead == 0))
3332 __ipv6_ifa_notify(event, ifp);
3333 read_unlock_bh(&addrconf_lock);
3334 }
3335
3336 #ifdef CONFIG_SYSCTL
3337
3338 static
3339 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3340 void __user *buffer, size_t *lenp, loff_t *ppos)
3341 {
3342 int *valp = ctl->data;
3343 int val = *valp;
3344 int ret;
3345
3346 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3347
3348 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3349 if (valp != &ipv6_devconf.forwarding) {
3350 if ((!*valp) ^ (!val)) {
3351 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3352 if (idev == NULL)
3353 return ret;
3354 dev_forward_change(idev);
3355 }
3356 } else {
3357 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3358 addrconf_forward_change();
3359 }
3360 if (*valp)
3361 rt6_purge_dflt_routers();
3362 }
3363
3364 return ret;
3365 }
3366
3367 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3368 int __user *name, int nlen,
3369 void __user *oldval,
3370 size_t __user *oldlenp,
3371 void __user *newval, size_t newlen,
3372 void **context)
3373 {
3374 int *valp = table->data;
3375 int new;
3376
3377 if (!newval || !newlen)
3378 return 0;
3379 if (newlen != sizeof(int))
3380 return -EINVAL;
3381 if (get_user(new, (int __user *)newval))
3382 return -EFAULT;
3383 if (new == *valp)
3384 return 0;
3385 if (oldval && oldlenp) {
3386 size_t len;
3387 if (get_user(len, oldlenp))
3388 return -EFAULT;
3389 if (len) {
3390 if (len > table->maxlen)
3391 len = table->maxlen;
3392 if (copy_to_user(oldval, valp, len))
3393 return -EFAULT;
3394 if (put_user(len, oldlenp))
3395 return -EFAULT;
3396 }
3397 }
3398
3399 if (valp != &ipv6_devconf_dflt.forwarding) {
3400 if (valp != &ipv6_devconf.forwarding) {
3401 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3402 int changed;
3403 if (unlikely(idev == NULL))
3404 return -ENODEV;
3405 changed = (!*valp) ^ (!new);
3406 *valp = new;
3407 if (changed)
3408 dev_forward_change(idev);
3409 } else {
3410 *valp = new;
3411 addrconf_forward_change();
3412 }
3413
3414 if (*valp)
3415 rt6_purge_dflt_routers();
3416 } else
3417 *valp = new;
3418
3419 return 1;
3420 }
3421
3422 static struct addrconf_sysctl_table
3423 {
3424 struct ctl_table_header *sysctl_header;
3425 ctl_table addrconf_vars[__NET_IPV6_MAX];
3426 ctl_table addrconf_dev[2];
3427 ctl_table addrconf_conf_dir[2];
3428 ctl_table addrconf_proto_dir[2];
3429 ctl_table addrconf_root_dir[2];
3430 } addrconf_sysctl = {
3431 .sysctl_header = NULL,
3432 .addrconf_vars = {
3433 {
3434 .ctl_name = NET_IPV6_FORWARDING,
3435 .procname = "forwarding",
3436 .data = &ipv6_devconf.forwarding,
3437 .maxlen = sizeof(int),
3438 .mode = 0644,
3439 .proc_handler = &addrconf_sysctl_forward,
3440 .strategy = &addrconf_sysctl_forward_strategy,
3441 },
3442 {
3443 .ctl_name = NET_IPV6_HOP_LIMIT,
3444 .procname = "hop_limit",
3445 .data = &ipv6_devconf.hop_limit,
3446 .maxlen = sizeof(int),
3447 .mode = 0644,
3448 .proc_handler = proc_dointvec,
3449 },
3450 {
3451 .ctl_name = NET_IPV6_MTU,
3452 .procname = "mtu",
3453 .data = &ipv6_devconf.mtu6,
3454 .maxlen = sizeof(int),
3455 .mode = 0644,
3456 .proc_handler = &proc_dointvec,
3457 },
3458 {
3459 .ctl_name = NET_IPV6_ACCEPT_RA,
3460 .procname = "accept_ra",
3461 .data = &ipv6_devconf.accept_ra,
3462 .maxlen = sizeof(int),
3463 .mode = 0644,
3464 .proc_handler = &proc_dointvec,
3465 },
3466 {
3467 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3468 .procname = "accept_redirects",
3469 .data = &ipv6_devconf.accept_redirects,
3470 .maxlen = sizeof(int),
3471 .mode = 0644,
3472 .proc_handler = &proc_dointvec,
3473 },
3474 {
3475 .ctl_name = NET_IPV6_AUTOCONF,
3476 .procname = "autoconf",
3477 .data = &ipv6_devconf.autoconf,
3478 .maxlen = sizeof(int),
3479 .mode = 0644,
3480 .proc_handler = &proc_dointvec,
3481 },
3482 {
3483 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3484 .procname = "dad_transmits",
3485 .data = &ipv6_devconf.dad_transmits,
3486 .maxlen = sizeof(int),
3487 .mode = 0644,
3488 .proc_handler = &proc_dointvec,
3489 },
3490 {
3491 .ctl_name = NET_IPV6_RTR_SOLICITS,
3492 .procname = "router_solicitations",
3493 .data = &ipv6_devconf.rtr_solicits,
3494 .maxlen = sizeof(int),
3495 .mode = 0644,
3496 .proc_handler = &proc_dointvec,
3497 },
3498 {
3499 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3500 .procname = "router_solicitation_interval",
3501 .data = &ipv6_devconf.rtr_solicit_interval,
3502 .maxlen = sizeof(int),
3503 .mode = 0644,
3504 .proc_handler = &proc_dointvec_jiffies,
3505 .strategy = &sysctl_jiffies,
3506 },
3507 {
3508 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3509 .procname = "router_solicitation_delay",
3510 .data = &ipv6_devconf.rtr_solicit_delay,
3511 .maxlen = sizeof(int),
3512 .mode = 0644,
3513 .proc_handler = &proc_dointvec_jiffies,
3514 .strategy = &sysctl_jiffies,
3515 },
3516 {
3517 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3518 .procname = "force_mld_version",
3519 .data = &ipv6_devconf.force_mld_version,
3520 .maxlen = sizeof(int),
3521 .mode = 0644,
3522 .proc_handler = &proc_dointvec,
3523 },
3524 #ifdef CONFIG_IPV6_PRIVACY
3525 {
3526 .ctl_name = NET_IPV6_USE_TEMPADDR,
3527 .procname = "use_tempaddr",
3528 .data = &ipv6_devconf.use_tempaddr,
3529 .maxlen = sizeof(int),
3530 .mode = 0644,
3531 .proc_handler = &proc_dointvec,
3532 },
3533 {
3534 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3535 .procname = "temp_valid_lft",
3536 .data = &ipv6_devconf.temp_valid_lft,
3537 .maxlen = sizeof(int),
3538 .mode = 0644,
3539 .proc_handler = &proc_dointvec,
3540 },
3541 {
3542 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3543 .procname = "temp_prefered_lft",
3544 .data = &ipv6_devconf.temp_prefered_lft,
3545 .maxlen = sizeof(int),
3546 .mode = 0644,
3547 .proc_handler = &proc_dointvec,
3548 },
3549 {
3550 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3551 .procname = "regen_max_retry",
3552 .data = &ipv6_devconf.regen_max_retry,
3553 .maxlen = sizeof(int),
3554 .mode = 0644,
3555 .proc_handler = &proc_dointvec,
3556 },
3557 {
3558 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3559 .procname = "max_desync_factor",
3560 .data = &ipv6_devconf.max_desync_factor,
3561 .maxlen = sizeof(int),
3562 .mode = 0644,
3563 .proc_handler = &proc_dointvec,
3564 },
3565 #endif
3566 {
3567 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3568 .procname = "max_addresses",
3569 .data = &ipv6_devconf.max_addresses,
3570 .maxlen = sizeof(int),
3571 .mode = 0644,
3572 .proc_handler = &proc_dointvec,
3573 },
3574 {
3575 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3576 .procname = "accept_ra_defrtr",
3577 .data = &ipv6_devconf.accept_ra_defrtr,
3578 .maxlen = sizeof(int),
3579 .mode = 0644,
3580 .proc_handler = &proc_dointvec,
3581 },
3582 {
3583 .ctl_name = 0, /* sentinel */
3584 }
3585 },
3586 .addrconf_dev = {
3587 {
3588 .ctl_name = NET_PROTO_CONF_ALL,
3589 .procname = "all",
3590 .mode = 0555,
3591 .child = addrconf_sysctl.addrconf_vars,
3592 },
3593 {
3594 .ctl_name = 0, /* sentinel */
3595 }
3596 },
3597 .addrconf_conf_dir = {
3598 {
3599 .ctl_name = NET_IPV6_CONF,
3600 .procname = "conf",
3601 .mode = 0555,
3602 .child = addrconf_sysctl.addrconf_dev,
3603 },
3604 {
3605 .ctl_name = 0, /* sentinel */
3606 }
3607 },
3608 .addrconf_proto_dir = {
3609 {
3610 .ctl_name = NET_IPV6,
3611 .procname = "ipv6",
3612 .mode = 0555,
3613 .child = addrconf_sysctl.addrconf_conf_dir,
3614 },
3615 {
3616 .ctl_name = 0, /* sentinel */
3617 }
3618 },
3619 .addrconf_root_dir = {
3620 {
3621 .ctl_name = CTL_NET,
3622 .procname = "net",
3623 .mode = 0555,
3624 .child = addrconf_sysctl.addrconf_proto_dir,
3625 },
3626 {
3627 .ctl_name = 0, /* sentinel */
3628 }
3629 },
3630 };
3631
3632 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3633 {
3634 int i;
3635 struct net_device *dev = idev ? idev->dev : NULL;
3636 struct addrconf_sysctl_table *t;
3637 char *dev_name = NULL;
3638
3639 t = kmalloc(sizeof(*t), GFP_KERNEL);
3640 if (t == NULL)
3641 return;
3642 memcpy(t, &addrconf_sysctl, sizeof(*t));
3643 for (i=0; t->addrconf_vars[i].data; i++) {
3644 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3645 t->addrconf_vars[i].de = NULL;
3646 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3647 }
3648 if (dev) {
3649 dev_name = dev->name;
3650 t->addrconf_dev[0].ctl_name = dev->ifindex;
3651 } else {
3652 dev_name = "default";
3653 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3654 }
3655
3656 /*
3657 * Make a copy of dev_name, because '.procname' is regarded as const
3658 * by sysctl and we wouldn't want anyone to change it under our feet
3659 * (see SIOCSIFNAME).
3660 */
3661 dev_name = kstrdup(dev_name, GFP_KERNEL);
3662 if (!dev_name)
3663 goto free;
3664
3665 t->addrconf_dev[0].procname = dev_name;
3666
3667 t->addrconf_dev[0].child = t->addrconf_vars;
3668 t->addrconf_dev[0].de = NULL;
3669 t->addrconf_conf_dir[0].child = t->addrconf_dev;
3670 t->addrconf_conf_dir[0].de = NULL;
3671 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3672 t->addrconf_proto_dir[0].de = NULL;
3673 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3674 t->addrconf_root_dir[0].de = NULL;
3675
3676 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3677 if (t->sysctl_header == NULL)
3678 goto free_procname;
3679 else
3680 p->sysctl = t;
3681 return;
3682
3683 /* error path */
3684 free_procname:
3685 kfree(dev_name);
3686 free:
3687 kfree(t);
3688
3689 return;
3690 }
3691
3692 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3693 {
3694 if (p->sysctl) {
3695 struct addrconf_sysctl_table *t = p->sysctl;
3696 p->sysctl = NULL;
3697 unregister_sysctl_table(t->sysctl_header);
3698 kfree(t->addrconf_dev[0].procname);
3699 kfree(t);
3700 }
3701 }
3702
3703
3704 #endif
3705
3706 /*
3707 * Device notifier
3708 */
3709
3710 int register_inet6addr_notifier(struct notifier_block *nb)
3711 {
3712 return notifier_chain_register(&inet6addr_chain, nb);
3713 }
3714
3715 int unregister_inet6addr_notifier(struct notifier_block *nb)
3716 {
3717 return notifier_chain_unregister(&inet6addr_chain,nb);
3718 }
3719
3720 /*
3721 * Init / cleanup code
3722 */
3723
3724 int __init addrconf_init(void)
3725 {
3726 int err = 0;
3727
3728 /* The addrconf netdev notifier requires that loopback_dev
3729 * has it's ipv6 private information allocated and setup
3730 * before it can bring up and give link-local addresses
3731 * to other devices which are up.
3732 *
3733 * Unfortunately, loopback_dev is not necessarily the first
3734 * entry in the global dev_base list of net devices. In fact,
3735 * it is likely to be the very last entry on that list.
3736 * So this causes the notifier registry below to try and
3737 * give link-local addresses to all devices besides loopback_dev
3738 * first, then loopback_dev, which cases all the non-loopback_dev
3739 * devices to fail to get a link-local address.
3740 *
3741 * So, as a temporary fix, allocate the ipv6 structure for
3742 * loopback_dev first by hand.
3743 * Longer term, all of the dependencies ipv6 has upon the loopback
3744 * device and it being up should be removed.
3745 */
3746 rtnl_lock();
3747 if (!ipv6_add_dev(&loopback_dev))
3748 err = -ENOMEM;
3749 rtnl_unlock();
3750 if (err)
3751 return err;
3752
3753 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3754
3755 register_netdevice_notifier(&ipv6_dev_notf);
3756
3757 addrconf_verify(0);
3758 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3759 #ifdef CONFIG_SYSCTL
3760 addrconf_sysctl.sysctl_header =
3761 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3762 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3763 #endif
3764
3765 return 0;
3766 }
3767
3768 void __exit addrconf_cleanup(void)
3769 {
3770 struct net_device *dev;
3771 struct inet6_dev *idev;
3772 struct inet6_ifaddr *ifa;
3773 int i;
3774
3775 unregister_netdevice_notifier(&ipv6_dev_notf);
3776
3777 rtnetlink_links[PF_INET6] = NULL;
3778 #ifdef CONFIG_SYSCTL
3779 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3780 addrconf_sysctl_unregister(&ipv6_devconf);
3781 #endif
3782
3783 rtnl_lock();
3784
3785 /*
3786 * clean dev list.
3787 */
3788
3789 for (dev=dev_base; dev; dev=dev->next) {
3790 if ((idev = __in6_dev_get(dev)) == NULL)
3791 continue;
3792 addrconf_ifdown(dev, 1);
3793 }
3794 addrconf_ifdown(&loopback_dev, 2);
3795
3796 /*
3797 * Check hash table.
3798 */
3799
3800 write_lock_bh(&addrconf_hash_lock);
3801 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3802 for (ifa=inet6_addr_lst[i]; ifa; ) {
3803 struct inet6_ifaddr *bifa;
3804
3805 bifa = ifa;
3806 ifa = ifa->lst_next;
3807 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3808 /* Do not free it; something is wrong.
3809 Now we can investigate it with debugger.
3810 */
3811 }
3812 }
3813 write_unlock_bh(&addrconf_hash_lock);
3814
3815 del_timer(&addr_chk_timer);
3816
3817 rtnl_unlock();
3818
3819 #ifdef CONFIG_PROC_FS
3820 proc_net_remove("if_inet6");
3821 #endif
3822 }
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